[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

EP4435175A1 - Method for producing a wood fibre fabric and wood fibre fabric production device - Google Patents

Method for producing a wood fibre fabric and wood fibre fabric production device Download PDF

Info

Publication number
EP4435175A1
EP4435175A1 EP23163742.2A EP23163742A EP4435175A1 EP 4435175 A1 EP4435175 A1 EP 4435175A1 EP 23163742 A EP23163742 A EP 23163742A EP 4435175 A1 EP4435175 A1 EP 4435175A1
Authority
EP
European Patent Office
Prior art keywords
steam
wood
voc
oxidizing agent
branched
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23163742.2A
Other languages
German (de)
French (fr)
Inventor
Joachim Hasch
Norbert Kalwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Swiss Krono Tec AG
Original Assignee
Swiss Krono Tec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Swiss Krono Tec AG filed Critical Swiss Krono Tec AG
Priority to EP23163742.2A priority Critical patent/EP4435175A1/en
Priority to PCT/EP2024/057236 priority patent/WO2024194290A1/en
Publication of EP4435175A1 publication Critical patent/EP4435175A1/en
Pending legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C7/00—Digesters
    • D21C7/10—Heating devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C7/00—Digesters
    • D21C7/12—Devices for regulating or controlling
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/007—Modification of pulp properties by mechanical or physical means

Definitions

  • the invention relates to a method for producing a wood fiber material, comprising the steps of (a) heating wood chips in a pre-cooker by means of water or steam, (b) then cooking the wood chips by means of steam in a cooker (14), and then (c) defibrating the wood chips in a refiner so that fiber material is produced, wherein (d) a portion of the steam is branched off after defibrating and used to heat or cook the wood chips.
  • the invention relates to a wood pulp manufacturing device for producing a wood pulp, comprising (a) a pre-cooker for heating wood chips by means of water or steam, (b) a cooker, which is arranged behind the pre-cooker in the wood material flow direction (H), for cooking the wood chips by means of steam so that cooked wood chips are produced, (c) a refiner, which is arranged behind the cooker in the wood material flow direction (H), for defibrating the cooked wood chips so that fiber material is produced, (d) a steam branch arranged behind the refiner in the wood material flow direction (H) for branching off part of the steam after defibrating and (e) an exhaust steam line which connects the steam branch to the pre-cooker or cooker for supplying steam.
  • Wood pulp is made from wood and is used, for example, to produce wood pulp boards or insulation material.
  • the production of wood pulp requires large amounts of steam, some of which is diverted and used to heat or cook the wood chips, as can be seen from the US$ 4,925,527
  • the invention is based on the object of reducing disadvantages in the prior art.
  • the invention solves the problem by a generic method with the step of introducing an oxidizing agent into the branched steam, so that volatile organic substances contained in the steam are oxidized and purified steam is produced, wherein the purified steam is at least partially used to heat the wood chips.
  • the invention also solves the problem by a generic wood pulp manufacturing device which has a steam cleaner which is designed to introduce an oxidizing agent into the steam so that volatile organic substances contained in the steam are oxidized and purified steam is produced.
  • the advantage of the invention is that it allows the production of wood pulp, for example in the production of wood fiber boards, for example LDF, MDF or HDF, with less energy expenditure.
  • the diverted steam is cleaned, it can be used in the process without terpenes and/or aldehydes accumulating in the wood pulp. If the steam were not cleaned, volatile organic substances contained in the diverted steam, in particular terpenes and/or aldehydes, would settle on the wood chips and thus increase the concentration of these volatile organic substances in the wood pulp, which is undesirable.
  • cleaning the steam generally prevents the volatile organic substances from settling on the exhaust steam line used to lead the diverted steam away from the steam branch.
  • a steam cleaner is understood to mean a device by means of which a VOC concentration (volatile organic compounds, volatile organic substances), in particular terpenes and/or Aldehydes can be reduced by at least 70% by chemical reaction of the volatile organic compounds with an oxidizing agent.
  • VOC concentration volatile organic compounds, volatile organic substances
  • terpenes and/or Aldehydes can be reduced by at least 70% by chemical reaction of the volatile organic compounds with an oxidizing agent.
  • Cooking wood chips means, in particular, heating the wood chips with water and/or steam.
  • the wood chips are first placed in the pre-cooker and then in the cooker.
  • Steam is a mixture of vaporous water and air, especially water vapor.
  • a wood fibre board is understood to mean in particular an LDF, MDF or HDF.
  • the oxidizing agent is preferably an agent for flameless oxidation.
  • the oxidizing agent contains oxygen. It is advantageous if the oxidizing agent releases elemental oxygen when reacting with terpenes and/or aldehydes.
  • the oxidizing agent is hydrogen peroxide or ozone. When hydrogen peroxide is mentioned, this also includes an aqueous solution of hydrogen peroxide.
  • the hydrogen peroxide can contain an Fe(II) salt, ammonium persulfate, cytochrome P450, monooxygenases or ammonium peroxide.
  • the oxidizing agent is not molecular oxygen or air.
  • the branching of the steam in particular the branched steam mass flow, can take place independently of the type of wood chips used.
  • a material flow control of the branched steam provided according to a preferred embodiment can be independent of the type and/or properties of the wood chips used. This makes it easier to control the wood fiber board manufacturing device. Instead, the oxidizing agent volume flow can be controlled in order to always fall below a predetermined maximum concentration of volatile organic substances.
  • the wood chips are heated by means of the purified steam in the pre-cooker.
  • wood chips are brought into contact with the steam, for example before cooking and shredding.
  • the VOC concentration i.e. the concentration of volatile organic substances, particularly terpenes and/or aldehydes, in the diverted steam.
  • the VOC concentration is given, for example, in mass per steam volume or in mass fraction of the steam.
  • the VOC concentration is understood to be a concentration on the basis of which the concentration of volatile organic components can be determined.
  • the introduction of the oxidizing agent into the branched steam is controlled based on the VOC concentration.
  • the amount of oxidizing agent, namely the oxidizing agent volume flow, which is introduced into the branched steam is increased when the VOC concentration increases.
  • the amount of oxidizing agent introduced into the branched steam can be reduced when the VOC concentration decreases. In this way, on the one hand, enough oxidizing agent is always introduced into the branched steam and, on the other hand, the consumption of oxidizing agent is minimized. It is advantageous if this VOC concentration is measured in the direction of steam flow upstream of an introduction point at which the oxidizing agent is introduced into the branched steam.
  • a second VOC concentration of volatile organic substances is continuously measured in the branched off steam.
  • the introduction of the oxidizing agent into the branched off steam is also controlled or regulated based on the second VOC concentration.
  • the amount of oxidizing agent introduced per unit of time is increased. This occurs in particular even if the first VOC concentration does not change.
  • the oxidizing agent flow is reduced according to a preferred embodiment. This occurs in particular even if the first VOC concentration does not change.
  • a fiber material-steam mixture leaves the refiner.
  • a maximum of 40 percent by mass of the steam in the fiber material-steam mixture is diverted. Diverting more steam usually makes it more difficult to convey the fiber material.
  • At least 10 percent by mass of the steam in the fiber material-steam mixture is diverted. This results in a high saving of energy that would otherwise be required to generate the steam.
  • the figures given are average values over 10 minutes.
  • the method comprises the step of irradiating the oxidizing agent with UV light.
  • the oxidizing agent is preferably irradiated with UV light immediately before it is introduced into the branched-off steam.
  • the distance between the point at which the oxidizing agent is irradiated with UV light and the point at which the oxidizing agent first comes into contact with the branched-off steam is at most 10 m, in particular at most 5 m.
  • the branched steam has a steam temperature of at least 110°C when the oxidizing agent is introduced.
  • the oxidizing agent reacts more quickly with the volatile organic substances, so that lower concentrations of volatile organic substances in the purified steam It is best if the steam temperature is 160°C or less. At even higher temperatures, the oxidizing agent usually decomposes too quickly.
  • the diverted steam has a pressure of at least 2 bar and/or at most 5 bar.
  • the method preferably comprises the step of applying glue, in particular using a blow line, to the wood fiber material and drying the glued fiber material. It is advantageous if the method comprises the steps of spreading the, in particular dried glued, fiber material to form a fiber cake and pressing the fiber cake to form the wood fiber board. The pressing is carried out, for example, using a belt press.
  • the steam cleaner comprises an introduction device for introducing the oxidizing agent into the steam line, by means of which branched steam is discharged from the steam cleaner.
  • the introduction device is designed to inject or atomize the oxidizing agent.
  • the steam cleaner can have an oxidizing agent tank filled with oxidizing agent, for example hydrogen peroxide.
  • the steam cleaner also has a pump for conveying the oxidizing agent to the introduction device.
  • the steam cleaner can have an oxidizing agent generator by means of which oxidizing agent can be produced.
  • the oxidizing agent generator can be an ozone generator.
  • the steam cleaner can have an oxidizing agent container in which oxidizing agent can be stored.
  • the oxidizing agent container is filled with hydrogen peroxide or ozone.
  • the wood fiber board manufacturing device has a VOC concentration meter for measuring a (first) VOC concentration of volatile organic substances, in particular terpenes/or aldehydes, and/or the total concentration of organic carbon compounds in the steam in the steam flow direction upstream of an introduction point at which the oxidizing agent is introduced into the branched steam.
  • the feeder is preferably designed to automatically introduce the oxidizing agent into the branched steam based on the measured VOC concentration.
  • the feeder controls or regulates the oxidizing agent volume flow.
  • the feeder contains a controllable pump and/or a controllable valve for this purpose.
  • the VOC concentration meter comprises, for example, a gas chromatograph with a flame ionization detector.
  • the VOC concentration meter is preferably designed to automatically measure the VOC concentration at regular intervals, for example more frequently than once per hour, in particular more frequently than once per half hour, particularly preferably more frequently than once per 10 minutes.
  • the wood pulp manufacturing device also comprises a flow meter for measuring a steam flow of branched steam.
  • the steam flow can be specified, for example, in mass per unit of time or volume per unit of time. It is advantageous if the steam branch is designed to branch off a predetermined steam flow.
  • the steam branch has a valve that is controlled by means of a controller, the controller being connected to the flow meter. In this way, the valve is controlled in such a way that a predetermined target steam flow is always achieved.
  • the feeder is designed to detect the VOC concentration from the VOC concentration meter and to automatically introduce the oxidizing agent into the branched steam based on the VOC concentration and the steam flow.
  • an oxidizing agent volume flow of oxidizing agent that is introduced into the branched steam per unit of time is calculated in particular based on the VOC concentration and, if applicable, the steam flow, and the oxidizing agent is then introduced accordingly.
  • the wood pulp manufacturing device preferably has a first introduction device for introducing the oxidizing agent into the branched steam at a first introduction point.
  • the steam cleaner is designed to regulate the VOC concentration to a predetermined VOC target concentration. If the measured VOC concentration deviates from the VOC target concentration, the oxidizing agent volume flow is adjusted so that the measured VOC concentration approaches the VOC target concentration. If the measured VOC concentration is above the VOC target concentration, the oxidizing agent volume flow is increased. If the measured VOC concentration is below the VOC target concentration, the oxidizing agent volume flow is reduced.
  • the wood pulp manufacturing device has a second VOC concentration meter for measuring a second VOC concentration (or a second TOC concentration) in the branched steam in the steam flow direction behind the introduction point, wherein the feeder is designed to automatically introduce the oxidizing agent into the branched steam based on the first VOC concentration and the second VOC concentration, and optionally the steam flow.
  • the feeder is designed to control or regulate the oxidizing agent volume flow based on the first and the second VOC concentration.
  • the wood pulp manufacturing device preferably has a second introduction device for introducing the oxidizing agent into the branched steam at a second introduction point which is located behind the first introduction point in the direction of steam flow.
  • the second introduction point is preferably located behind the second VOC concentration meter. It is advantageous if the steam cleaner is designed to control a second oxidizing agent volume flow of oxidizing agent which is introduced at the second introduction point, depending on the second VOC concentration.
  • the steam cleaner is designed to regulate the second VOC concentration to a predetermined second VOC target concentration. If the measured second VOC concentration deviates from the second VOC target concentration, the first and/or second oxidizing agent volume flow is adjusted so that the measured second VOC concentration approaches the second VOC target concentration. If the measured second VOC concentration is above the second VOC target concentration, the first and/or second Oxidizing agent volume flow is increased. If the measured second VOC concentration is below the second VOC target concentration, the first and/or second oxidizing agent volume flow is reduced.
  • the wood fiber production device has a hopper for applying glue to the fiber material.
  • a hopper is understood to be a device by means of which the fiber material can be glued.
  • the wood fiber production device is part of a wood fiber board production device according to the invention for producing light, medium density fiber boards (LDF), medium density fiber boards (MDF) and/or high density fiber boards (HDF).
  • the invention also provides a wood fiber board production device for producing a wood fiber board, in particular an MDF board, with (a) a cooker for cooking wood chips using steam so that cooked wood chips are produced, (b) a refiner, which is arranged behind the cooker in the direction of wood material flow, for defibrating the cooked wood chips so that fiber material is produced and optionally (c) a blower, in particular a blow line, arranged behind the refiner in the direction of wood material flow, for gluing the fiber material so that glued fiber material is produced.
  • a cooker for cooking wood chips using steam so that cooked wood chips are produced
  • a refiner which is arranged behind the cooker in the direction of wood material flow, for defibrating the cooked wood chips so that fiber material is produced
  • a blower in particular a blow line
  • a steam branch for branching off steam is arranged and the wood pulp production device has a steam cleaner which is designed to introduce an oxidizing agent into the steam so that volatile organic substances contained in the steam are oxidized and purified steam is produced.
  • a wood fiber board is understood to mean a board that is made using wood.
  • the wood fiber board preferably has a thickness of between 2 mm and 60 mm.
  • the density of the wood fiber board is preferably between 600 kg per cubic meter and 1000 kg per cubic meter.
  • the wood chips are preferably wood chips.
  • Gluing can be done using a blow line, for example.
  • a blow line is preferably arranged behind the steam branch in the direction of wood material flow.
  • FIG. 1 shows a flow diagram of a wood fiber production device 10 according to the invention for producing wood fiber 11.
  • the wood fiber production device 10 has a cooker 14 which receives heated wood chips 18 from a pre-cooker 16.
  • the wood chips 18 were cleaned by means of a washing system 24 before being introduced into the pre-cooker 16.
  • a refiner 32 is arranged behind the cooker 14 in the wood material flow direction H, by means of which the wood chips 18 coming from the cooker 14 are shredded. Together with steam 26, a steam-fiber material mixture 38 is thus created.
  • steam 26 is branched off from the steam-fiber material mixture 38 and fed into an exhaust steam line 69.
  • a steam cleaner 52 is arranged in the exhaust steam line 69. The steam cleaner 52 functions as described below in connection with Figure 2 described.
  • the wood pulp 11 is used, for example, for the production of insulation material, medium-density fiberboards (MDF), lightweight medium-density fiberboards (LDF), high-density fiberboards (HDF), plant substrate for plant cultivation, for example potting soil, or packaging material.
  • MDF medium-density fiberboards
  • LDF lightweight medium-density fiberboards
  • HDF high-density fiberboards
  • plant substrate for plant cultivation for example potting soil, or packaging material.
  • Figure 2 shows the flow chart of a wood fiber board manufacturing device 10 according to the invention for producing a wood fiber board 12 in the form of an MDF board.
  • the pre-cooker 16 is fed with the wood chips 18, which are produced, for example, using a chipper 20 and then optionally washed in the washing system 24.
  • Round wood 22 can be used as the raw material, but other sources of wood are also possible.
  • the wood chips 14 are heated with hot water and/or steam 26'.
  • the water or steam 26' can be generated using a boiler.
  • the heated wood chips 18 pass from the pre-cooker 16 into the cooker 14.
  • the resulting steam-wood chip mixture 30 reaches the refiner 32, in which the fiber material 34 is produced.
  • the steam branch 36 is arranged, by means of which the steam 26 can be branched off. For example, 20 to 30 percent by mass of the steam contained in the steam-fiber material mixture 38 is branched off.
  • the remaining steam-fiber material mixture 38 is fed to a blow line 40 and provided with glue there.
  • the glued fiber material 42 thus produced is fed to a dryer 44 where it is dried.
  • the dried fiber material 42 is then fed to a spreader 46 which spreads a fiber cake 48.
  • the fiber cake 48 is pressed into the wood fiber board 12 using a press 50.
  • the steam cleaner 52 arranged behind the steam branch 36 in the steam flow direction D introduces an oxidizing agent 56 into the branched steam 26 at an introduction point 54.
  • the oxidizing agent is hydrogen peroxide.
  • the steam cleaner 52 can have a second VOC concentration meter 64, which is located behind the introduction point 54 in the steam flow direction D.
  • the second VOC concentration meter measures a second VOC concentration c VOC,2 . In the present case, this is the TOC concentration of the total concentration of organic compounds. If the second VOC concentration c VOC,2 is above a predetermined maximum concentration c VOC,max , the oxidizing agent volume flow Q 56 is increased.
  • the steam cleaner 52 regulates the second VOC concentration c VOC,2 to a VOC target concentration c VOC , target by increasing or decreasing the oxidizing agent volume flow Q 56 .
  • the steam cleaner 52 it is possible for the steam cleaner 52 to have an introduction device, for example a nozzle 66, for introducing oxidizing agent at a second introduction point 54' behind the second VOC concentration meter 64 in the steam flow direction D.
  • an introduction device for example a nozzle 66
  • the oxidizing agent volume flow Q 56 it is possible for the oxidizing agent volume flow Q 56 to be increased if the second VOC concentration c VOC,2 is above the maximum concentration c VOC,max . It is possible, but not necessary, for the same oxidizing agent to be introduced at both introduction points 54, 54'. In particular, it is possible for 2 different oxidizing agents to be used.
  • purified steam 68 is produced, which is fed to the pre-cooker 16 via an exhaust steam line 69.
  • the steam cleaner 52 can have a light source 74 by means of which the oxidizing agent 56 can be irradiated with UV light. In this way, hydroxyl radicals are formed, which particularly effectively destroy the volatile organic substances in the diverted steam 26.
  • a steam temperature T 26 is, for example, 140°C ⁇ 5°C.
  • the oxidizing agent 56 in this case is a 10 percent (weight percent) hydrogen peroxide solution.
  • Wood fibreboard manufacturing device 60 Doser 11 Wood pulp 62 first VOC concentration meter 12 Wood fibreboard 14 cooker 64 second VOC concentration meter 16 Pre-cooker 18 (Minced) chips 66 second feeder, second nozzle 20 hacker 68 purified steam 22 Roundwood 69 Exhaust steam line 24 Car wash 26 steam 70 Branch valves 72 capacitor 30 Steam-woodchip mixture 74 Light source 32 Refiner cVOCs,1 first VOC concentration 34 Fibre material cVOCs,2 second VOC concentration 36 Steam branch c VOC,max Maximum concentration of volatile organic compounds (VOC) 38 Steam-fiber material mixture 40 Blow-Line, Beleimer c VOC,should VOC target concentration 42 glued fibre material D Steam flow direction 44 dryer H Wood flow direction 46 Spreader Q56 Oxidant volume flow 48 Fiber cake T26 Steam temperature 50 press 52 Steam cleaner 54 Place of entry 54 ⁇ second entry point 56 Oxidizing agents 57 Insertion device, first nozzle 58 Oxidizer container

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

Die Erfindung betrifft ein Verfahren zum Herstellen eines Holzfaserstoffs, mit den Schritten Erwärmen von Holzhackschnitzeln (18) in einem Vorkocher (16) mittels Wasser oder Dampf (26), danach Kochen der Holzhackschnitzel (18) mittels Dampf (26) in einem Kocher (14), danach Zerfasern der Holzhackschnitzel (18) in einem Refiner (32), sodass Fasermaterial (34) entsteht, wobei ein Teil des Dampfes nach dem Zerfasern abgezweigt und zum Erwärmen der Holzhackschnitzel (18) im Vorkocher (16) verwendet wird, mit dem Schritt Einbringen eines Oxidationsmittels (56) in den abgezweigten Dampf (26), sodass im Dampf (26) enthaltene volatile organische Substanzen oxidiert werden und gereinigter Dampf (68) entsteht, wobei der gereinigte Dampf (68) zumindest teilweise zum Erwärmen der Holzhackschnitzel (18) verwendet wird.The invention relates to a method for producing a wood fiber material, comprising the steps of heating wood chips (18) in a pre-cooker (16) by means of water or steam (26), then cooking the wood chips (18) by means of steam (26) in a cooker (14), then defibrating the wood chips (18) in a refiner (32) so that fiber material (34) is produced, wherein a portion of the steam is branched off after defibrating and used to heat the wood chips (18) in the pre-cooker (16), comprising the step of introducing an oxidizing agent (56) into the branched off steam (26) so that volatile organic substances contained in the steam (26) are oxidized and purified steam (68) is produced, wherein the purified steam (68) is at least partially used to heat the wood chips (18).

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Holzfaserstoffs, mit den Schritten (a) Erwärmen von Holzhackschnitzeln in einem Vorkocher mittels Wasser oder Dampf, (b) danach Kochen der Holzhackschnitzeln mittels Dampf in einem Kocher (14), und danach (c) Zerfasern der Holzhackschnitzeln in einem Refiner, sodass Fasermaterial entsteht, wobei (d) ein Teil des Dampfs nach dem Zerfasern abgezweigt und zum Erwärmen oder Kochen der Holzhackschnitzeln verwendet wird.The invention relates to a method for producing a wood fiber material, comprising the steps of (a) heating wood chips in a pre-cooker by means of water or steam, (b) then cooking the wood chips by means of steam in a cooker (14), and then (c) defibrating the wood chips in a refiner so that fiber material is produced, wherein (d) a portion of the steam is branched off after defibrating and used to heat or cook the wood chips.

Gemäß einem zweiten Aspekt betrifft die Erfindung Holzfaserstoff-Herstellvorrichtung zum Herstellen eines Holzfaserstoffs, mit (a) einem Vorkocher zum Erwärmen von Holzhackschnitzeln mittels Wasser oder Dampf, (b) einem Kocher, der in Holzmaterialflussrichtung (H) hinter dem Vorkocher angeordnet ist, zum Kochen der Holzhackschnitzeln, mittels Dampf, sodass gekochte Holzhackschnitzel entstehen, (c) einem Refiner, der in Holzmaterialflussrichtung (H) hinter dem Kocher angeordnet ist, zum Zerfasern der gekochten Holzhackschnitzeln, sodass Fasermaterial entsteht, (d) einem in Holzmaterialflussrichtung (H) hinter Refiner angeordneten Dampfabzweig zum Abzweigen eine Teils des Dampfs nach dem Zerfasern und (e) einer Abdampfleitung, die den Dampfabzweig mit dem Vorkocher oder Kocher zum Zuführen von Dampf zum verbindet.According to a second aspect, the invention relates to a wood pulp manufacturing device for producing a wood pulp, comprising (a) a pre-cooker for heating wood chips by means of water or steam, (b) a cooker, which is arranged behind the pre-cooker in the wood material flow direction (H), for cooking the wood chips by means of steam so that cooked wood chips are produced, (c) a refiner, which is arranged behind the cooker in the wood material flow direction (H), for defibrating the cooked wood chips so that fiber material is produced, (d) a steam branch arranged behind the refiner in the wood material flow direction (H) for branching off part of the steam after defibrating and (e) an exhaust steam line which connects the steam branch to the pre-cooker or cooker for supplying steam.

Holzfaserstoffe werden aus Holz hergestellt und dienen beispielsweise der Herstellung von Holzfaserplatten oder von Dämmmaterial. Die Herstellung von Holzfaserstoff erfordert große Mengen an Dampf, die teilweise abgezweigt und zum Erwärmen oder zum Kochen der Holzhackschnitzeln verwendet wird, wie aus der US 4 925 527 bekannt ist. Um zu verhindern, dass sich im Holz befindliche volatile organische Substanzen im Holzfaserstoffe anreichern, wird ein Teil des Dampfs kondensiert, die terpenreichen Anteile abgeschieden und die beim Kondensieren frei werdende Wärme zum Verdampfen von Wasser genutzt. Dieser Prozess ist aufwendig und wenig Energie effizient. Es besteht daher der Wunsch, den Energieverbrauch zu senken.Wood pulp is made from wood and is used, for example, to produce wood pulp boards or insulation material. The production of wood pulp requires large amounts of steam, some of which is diverted and used to heat or cook the wood chips, as can be seen from the US$ 4,925,527 To prevent volatile organic substances contained in the wood from accumulating in the wood fibres, part of the steam is condensed, the terpene-rich parts are separated and the gas released during condensation Heat is used to evaporate water. This process is complex and not very energy efficient. There is therefore a desire to reduce energy consumption.

Der Erfindung liegt die Aufgabe zugrunde Nachteile im Stand der Technik zu vermindern.The invention is based on the object of reducing disadvantages in the prior art.

Die Erfindung löst das Problem durch ein gattungsgemäßes Verfahren mit dem Schritt des Einbringens eines Oxidationsmittels in den abgezweigten Dampf, sodass im Dampf enthaltene volatile organische Substanzen oxidiert werden und gereinigter Dampf entsteht, wobei der gereinigte Dampf zumindest teilweise zum Erwärmen der Holzhackschnitzeln verwendet wird.The invention solves the problem by a generic method with the step of introducing an oxidizing agent into the branched steam, so that volatile organic substances contained in the steam are oxidized and purified steam is produced, wherein the purified steam is at least partially used to heat the wood chips.

Die Erfindung löst das Problem zudem durch eine gattungsgemäße Holzfaserstoff-Herstellvorrichtung, die einen Dampfreiniger aufweist, der ausgebildet ist zum Einbringen eines Oxidationsmittels in den Dampf, sodass im Dampf enthaltene volatile organische Substanzen oxidiert werden und gereinigter Dampf entsteht.The invention also solves the problem by a generic wood pulp manufacturing device which has a steam cleaner which is designed to introduce an oxidizing agent into the steam so that volatile organic substances contained in the steam are oxidized and purified steam is produced.

Vorteilhaft an der Erfindung ist, dass sie die Herstellung von Holzfaserstoff, beispielsweise im Rahmen der Herstellung von Holzfaserplatten, beispielsweise LDF, MDF oder HDF, mit geringerem Energieaufwand erlaubt. Dadurch, dass der abgezweigte Dampf gereinigt wird, kann er im Prozess verwendet werden, ohne dass sich Terpene und/oder Aldehyde im Holzfaserstoff anreichern. Würde der Dampf nicht gereinigt, würden sich im abgezweigten Dampf enthaltene volatile organische Substanzen, insbesondere Terpene und/oder Aldehyde, an den Holzhackschnitzeln absetzen und so die Konzentration an diesen volatilen organischen Substanzen im Holzfaserstoff erhöhen, was unerwünscht ist. Zudem wird durch das Reinigen des Dampfs in der Regel vermieden, dass sich die volatilen organischen Substanzen an der Abdampfleitung, mittels der der abgezweigte Dampf vom Dampfabzweig weggeführt wird, absetzen.The advantage of the invention is that it allows the production of wood pulp, for example in the production of wood fiber boards, for example LDF, MDF or HDF, with less energy expenditure. Because the diverted steam is cleaned, it can be used in the process without terpenes and/or aldehydes accumulating in the wood pulp. If the steam were not cleaned, volatile organic substances contained in the diverted steam, in particular terpenes and/or aldehydes, would settle on the wood chips and thus increase the concentration of these volatile organic substances in the wood pulp, which is undesirable. In addition, cleaning the steam generally prevents the volatile organic substances from settling on the exhaust steam line used to lead the diverted steam away from the steam branch.

Im Rahmen der vorliegenden Beschreibung wird unter einem Dampfreiniger eine Vorrichtung verstanden, mittels der eine VOC-Konzentration (volatile organic compounds, volatile organische Substanzen), insbesondere Terpenen und/oder Aldehyden, durch chemische Reaktion der volatilen organischen Verbindungen mit ein Oxidationsmittel, um zumindest 70 % reduziert werden kann.In the context of the present description, a steam cleaner is understood to mean a device by means of which a VOC concentration (volatile organic compounds, volatile organic substances), in particular terpenes and/or Aldehydes can be reduced by at least 70% by chemical reaction of the volatile organic compounds with an oxidizing agent.

Unter dem Kochen der Holzhackschnitzel wird insbesondere verstanden, dass die Hackschnitzel mit Wasser und/oder Dampf erhitzt werden. Die Holzhackschnitzel werden zunächst in den Vorkocher, danach in den Kocher eingebracht.Cooking wood chips means, in particular, heating the wood chips with water and/or steam. The wood chips are first placed in the pre-cooker and then in the cooker.

Unter Dampf wird eine Mischung aus dampfförmigem Wasser und Luft, insbesondere Wasserdampf, verstanden.Steam is a mixture of vaporous water and air, especially water vapor.

Unter einer Holzfaserplatte wird insbesondere eine LDF, MDF oder HDF verstanden.A wood fibre board is understood to mean in particular an LDF, MDF or HDF.

Statt von gekochten Holzhackschnitzeln könnte auch von erhitzten Holzhackschnitzeln gesprochen werden.Instead of cooked wood chips, one could also speak of heated wood chips.

Vorzugsweise ist das Oxidationsmittel ein Mittel zur flammenlosen Oxidation. Gemäß einer Ausführungsform ist das Oxidationsmittel sauerstoffhaltig. Günstig ist es, wenn das Oxidationsmittel bei Reaktion mit Terpenen und/oder Aldehyden elementaren Sauerstoff abgibt. Beispielsweise handelt es sich beim Oxidationsmittel um Wasserstoffperoxid oder Ozon. Wenn von Wasserstoffperoxid gesprochen wird, wird darunter auch eine wässrige Lösung von Wasserstoffperoxid verstanden. Das Wasserstoffperoxid kann ein Fe(II)-Salz, Ammoniumpersulfat, Cytochrom P450, Monooxygenasen oder Ammoniumperoxid enthalten. Insbesondere ist das Oxidationsmittel nicht molekularer Sauerstoff oder Luft.The oxidizing agent is preferably an agent for flameless oxidation. According to one embodiment, the oxidizing agent contains oxygen. It is advantageous if the oxidizing agent releases elemental oxygen when reacting with terpenes and/or aldehydes. For example, the oxidizing agent is hydrogen peroxide or ozone. When hydrogen peroxide is mentioned, this also includes an aqueous solution of hydrogen peroxide. The hydrogen peroxide can contain an Fe(II) salt, ammonium persulfate, cytochrome P450, monooxygenases or ammonium peroxide. In particular, the oxidizing agent is not molecular oxygen or air.

Günstig ist es, dass das Abzweigen des Dampfs, insbesondere der abgezweigte Dampfmassenstrom, unabhängig von der Art der eingesetzten Holzhackschnitzeln erfolgen kann. Insbesondere ist es günstig, dass eine gemäß einer bevorzugten Ausführungsform vorgesehene Stoffstromregelung des abgezweigten Dampfs unabhängig von der Art und oder den Eigenschaften der eingesetzten Holzhackschnitzeln sein kann. Das erleichtert die Regelung der Holzfaserplatten-Herstellvorrichtung. Stattdessen kann der Oxidationsmittelvolumenstrom geregelt werden, um stets eine vorgegebene Maximal-Konzentration an volatilen organischen Substanzen zu unterschreiten.It is advantageous that the branching of the steam, in particular the branched steam mass flow, can take place independently of the type of wood chips used. In particular, it is advantageous that a material flow control of the branched steam provided according to a preferred embodiment can be independent of the type and/or properties of the wood chips used. This makes it easier to control the wood fiber board manufacturing device. Instead, the oxidizing agent volume flow can be controlled in order to always fall below a predetermined maximum concentration of volatile organic substances.

Gemäß einer bevorzugten Ausführungsform werden die Holzhackschnitzeln mittels des gereinigten Dampfs im Vorkocher erwärmt. Dazu werden Holzhackschnitzeln beispielsweise vor dem Kochen und Zerfasern mit dem Dampf in Kontakt gebracht.According to a preferred embodiment, the wood chips are heated by means of the purified steam in the pre-cooker. For this purpose, wood chips are brought into contact with the steam, for example before cooking and shredding.

Günstig ist es, wenn die VOC-Konzentration, also die Konzentration an volatilen organischen Substanzen, insbesondere Terpenen und/oder Aldehyde, im abgezweigten Dampf, kontinuierlich gemessen wird. Die VOC-Konzentration wird beispielsweise in Masse pro Dampfvolumen oder in Masseanteil am Dampf angegeben. Unter der VOC-Konzentration wird eine Konzentration verstanden, anhand der auf die Konzentration an volatilen organischen Bestandteilen geschlossen werden kann. Insbesondere ist auch die TOC-Konzentration aller organischer Kohlenstoff-Verbindungen eine VOC-Konzentration, wenn es um das Einhalten einer Obergrenze geht. Wenn im Folgenden von der VOC-Konzentration gesprochen wird, könnte verallgemeinernd stets auch von der TOC-Konzentration gesprochen werden (TOC = total organic carbon, gesamter organischer Kohlenstoff).It is beneficial if the VOC concentration, i.e. the concentration of volatile organic substances, particularly terpenes and/or aldehydes, in the diverted steam, is measured continuously. The VOC concentration is given, for example, in mass per steam volume or in mass fraction of the steam. The VOC concentration is understood to be a concentration on the basis of which the concentration of volatile organic components can be determined. In particular, the TOC concentration of all organic carbon compounds is also a VOC concentration when it comes to complying with an upper limit. When the VOC concentration is mentioned below, the TOC concentration could also be generally referred to (TOC = total organic carbon).

Vorzugsweise wird das Einbringen des Oxidationsmittels in den abgezweigten Dampf anhand der VOC-Konzentration gesteuert. In anderen Worten wird insbesondere die Menge an Oxidationsmittel, nämlich der Oxidationsmittelvolumenstrom, die in den abgezweigten Dampf eingebracht wird, erhöht, wenn die VOC-Konzentration steigt. Zusätzlich kann die Menge an Oxidationsmittel, die in den abgezweigten Dampf eingebracht wird, gesenkt werden, wenn die VOC-Konzentration sinkt. Auf diese Weise wird einerseits stets genug Oxidationsmittel in den abgezweigten Dampf eingebracht und andererseits der Verbrauch an Oxidationsmittel minimiert. Günstig ist es, wenn diese VOC-Konzentration in Dampfflussrichtung vor einer Einbringstelle gemessen wird, an der das Oxidationsmittel in den abgezweigten Dampf eingebracht wird.Preferably, the introduction of the oxidizing agent into the branched steam is controlled based on the VOC concentration. In other words, in particular the amount of oxidizing agent, namely the oxidizing agent volume flow, which is introduced into the branched steam is increased when the VOC concentration increases. In addition, the amount of oxidizing agent introduced into the branched steam can be reduced when the VOC concentration decreases. In this way, on the one hand, enough oxidizing agent is always introduced into the branched steam and, on the other hand, the consumption of oxidizing agent is minimized. It is advantageous if this VOC concentration is measured in the direction of steam flow upstream of an introduction point at which the oxidizing agent is introduced into the branched steam.

Gemäß einer Ausführungsform wird kontinuierlich eine zweite VOC-Konzentration an volatilen organischen Substanzen, insbesondere Terpenen und/oder Aldehyden, im abgezweigten Dampf gemessen. Vorzugsweise wird das Einbringen des Oxidationsmittels in den abgezweigten Dampf auch anhand der zweiten VOC-Konzentration gesteuert oder geregelt.According to one embodiment, a second VOC concentration of volatile organic substances, in particular terpenes and/or aldehydes, is continuously measured in the branched off steam. Preferably, the introduction of the oxidizing agent into the branched off steam is also controlled or regulated based on the second VOC concentration.

Steigt beispielsweise die zweite VOC-Konzentration über eine vorgegebene Maximal-Konzentration so wird gemäß einer bevorzugten Ausführungsform die pro Zeiteinheit eingebrachte Menge an Oxidationsmittel (Oxidationsmittelfluss) erhöht. Das erfolgt insbesondere auch dann, wenn die erste VOC-Konzentration sich nicht ändert.If, for example, the second VOC concentration rises above a predetermined maximum concentration, according to a preferred embodiment, the amount of oxidizing agent introduced per unit of time (oxidizing agent flow) is increased. This occurs in particular even if the first VOC concentration does not change.

Sinkt die zweite VOC-Konzentration unter eine vorgegebene Minimal-Konzentration, so wird gemäß einer bevorzugten Ausführungsform der Oxidationsmittelfluss vermindert. Das erfolgt insbesondere auch dann, wenn die erste VOC-Konzentration sich nicht ändert.If the second VOC concentration falls below a predetermined minimum concentration, the oxidizing agent flow is reduced according to a preferred embodiment. This occurs in particular even if the first VOC concentration does not change.

In der Regel verlässt ein Fasermaterial-Dampf-Gemisch den Refiner. Gemäß einer bevorzugten Ausführungsform werden höchstens 40 Masseprozent des Dampfs im Fasermaterial-Dampf-Gemisch abgezweigt. Das Abzweigen von mehr Dampf erschwert meistens das Fördern des Fasermaterials.As a rule, a fiber material-steam mixture leaves the refiner. According to a preferred embodiment, a maximum of 40 percent by mass of the steam in the fiber material-steam mixture is diverted. Diverting more steam usually makes it more difficult to convey the fiber material.

Alternativ oder zusätzlich werden zumindest 10 Masseprozent des Dampfs im Fasermaterial-Dampf-Gemisch abgezweigt. Auf diese Weise ergibt sich eine hohe Einsparung an Energieträger, der andernfalls zum Erzeugen des Dampfs notwendig wäre. Bei den Angaben handelt es sich beispielsweise um Mittelwerte über 10 Minuten.Alternatively or additionally, at least 10 percent by mass of the steam in the fiber material-steam mixture is diverted. This results in a high saving of energy that would otherwise be required to generate the steam. The figures given are average values over 10 minutes.

Gemäß einer Ausführungsform umfasst das Verfahren den Schritt des Bestrahlens des Oxidationsmittels mit UV-Licht. Dadurch wird beispielsweise erreicht, dass das Oxidationsmittel Radikale, insbesondere Hydroxylradikale, bildet. Vorzugsweise erfolgt das Bestrahlen des Oxidationsmittels mit UV-Licht unmittelbar vor dem Einbringen in den abgezweigten Dampf. Insbesondere beträgt ein Abstand zwischen der Stelle, an der das Oxidationsmittel mit UV-Licht bestrahlt wird und der Stelle, an der das Oxidationsmittel erstmals in Kontakt mit dem abgezweigten Dampf kommt, höchstens 10 m, insbesondere höchstens 5 m.According to one embodiment, the method comprises the step of irradiating the oxidizing agent with UV light. This results, for example, in the oxidizing agent forming radicals, in particular hydroxyl radicals. The oxidizing agent is preferably irradiated with UV light immediately before it is introduced into the branched-off steam. In particular, the distance between the point at which the oxidizing agent is irradiated with UV light and the point at which the oxidizing agent first comes into contact with the branched-off steam is at most 10 m, in particular at most 5 m.

Vorzugsweise hat der abgezweigte Dampf beim Einbringen des Oxidationsmittels einer Dampftemperatur von zumindest 110°C. Bei hohen Temperaturen regiert das Oxidationsmittel schneller mit den volatilen organischen Substanzen, sodass geringere Konzentrationen an volatilen organischen Substanzen im gereinigten Dampf erreichbar sind. Günstig ist es, wenn die Dampftemperatur höchstens 160°C beträgt. Bei noch höheren Temperaturen zersetzt sich das Oxidationsmittel in der Regel zu schnell.Preferably, the branched steam has a steam temperature of at least 110°C when the oxidizing agent is introduced. At high temperatures, the oxidizing agent reacts more quickly with the volatile organic substances, so that lower concentrations of volatile organic substances in the purified steam It is best if the steam temperature is 160°C or less. At even higher temperatures, the oxidizing agent usually decomposes too quickly.

Vorzugsweise hat der abgezweigte Dampf einen Druck von zumindest 2 bar und/oder höchstens 5 bar.Preferably, the diverted steam has a pressure of at least 2 bar and/or at most 5 bar.

Vorzugsweise umfasst das Verfahren den Schritt des Beleimens, insbesondere mittels einer Blow-Line, des Holzfaserstoffs und des Trocknens des beleimten Fasermaterials. Günstig ist es, wenn das Verfahren die Schritte des Streuens des, insbesondere getrockneten beleimten, Fasermaterial zu einem Faserkuchen und des Verpressens des Faserkuchens zur Holzfaserplatte aufweist. Das Verpressen erfolgt beispielsweise mittels einer Bandpresse.The method preferably comprises the step of applying glue, in particular using a blow line, to the wood fiber material and drying the glued fiber material. It is advantageous if the method comprises the steps of spreading the, in particular dried glued, fiber material to form a fiber cake and pressing the fiber cake to form the wood fiber board. The pressing is carried out, for example, using a belt press.

In einer Ausführungsform umfasst der Dampfreiniger eine Einbringvorrichtung zum Einbringen des Oxidationsmittels in die Dampfleitung, mittels der abgezweigter Dampf vom Dampfreiniger abgeführt wird. Beispielsweise ist die Einbringvorrichtung ausgebildet zum Eindüsen oder Zerstäuben des Oxidationsmittels.In one embodiment, the steam cleaner comprises an introduction device for introducing the oxidizing agent into the steam line, by means of which branched steam is discharged from the steam cleaner. For example, the introduction device is designed to inject or atomize the oxidizing agent.

Der Dampfreiniger kann einen Oxidationsmitteltank, der mit Oxidationsmittel, beispielsweise Wasserstoffperoxid, gefüllt ist, aufweisen. Vorzugsweise besitzt der Dampfreiniger zudem eine Pumpe zum Fördern des Oxidationsmittels zur Einbringvorrichtung. Alternativ oder zusätzlich kann der Dampfreiniger einen Oxidationsmittelerzeuger aufweisen, mittels dem Oxidationsmittel herstellbar ist. Beispielsweise kann der Oxidationsmittelerzeuger ein Ozongenerator sein. Alternativ oder zusätzlich kann der Dampfreiniger einen Oxidationsmittelbehälter aufweisen, in dem Oxidationsmittel gespeichert werden kann. Beispielsweise ist der Oxidationsmittelbehälter mit Wasserstoffperoxid oder Ozon gefüllt.The steam cleaner can have an oxidizing agent tank filled with oxidizing agent, for example hydrogen peroxide. Preferably, the steam cleaner also has a pump for conveying the oxidizing agent to the introduction device. Alternatively or additionally, the steam cleaner can have an oxidizing agent generator by means of which oxidizing agent can be produced. For example, the oxidizing agent generator can be an ozone generator. Alternatively or additionally, the steam cleaner can have an oxidizing agent container in which oxidizing agent can be stored. For example, the oxidizing agent container is filled with hydrogen peroxide or ozone.

Günstig ist es, wenn die Holzfaserplatten-Herstellvorrichtung einen VOC-Konzentrationsmesser zum Messen einer (ersten) VOC-Konzentration an volatilen organischen Substanzen, insbesondere Terpene/oder Aldehyden, und/oder der Gesamtkonzentration an organischen Kohlenstoffverbindungen im Dampf in Dampfflussrichtung vor einer Einbringstelle, an der das Oxidationsmittel in den abgezweigten Dampf eingebracht wird, aufweist.It is advantageous if the wood fiber board manufacturing device has a VOC concentration meter for measuring a (first) VOC concentration of volatile organic substances, in particular terpenes/or aldehydes, and/or the total concentration of organic carbon compounds in the steam in the steam flow direction upstream of an introduction point at which the oxidizing agent is introduced into the branched steam.

Der Zudosierer ist vorzugsweise ausgebildet zum automatischen Einbringen des Oxidationsmittels in den abgezweigten Dampf anhand der gemessenen VOC-Konzentration. In anderen Worten steuert oder regelt der Zudosierer den Oxidationsmittelvolumenstrom. Beispielsweise enthält der Zudosierer dazu eine regelbare Pumpe und/oder ein ansteuerbares Ventil.The feeder is preferably designed to automatically introduce the oxidizing agent into the branched steam based on the measured VOC concentration. In other words, the feeder controls or regulates the oxidizing agent volume flow. For example, the feeder contains a controllable pump and/or a controllable valve for this purpose.

Der VOC-Konzentrationsmesser umfasst beispielsweise einen Gaschromatographen mit einem Flammenionisationsdetektor. Der VOC-Konzentrationsmesse ist vorzugsweise ausgebildet zum automatischen Messen der VOC-Konzentration in regelmäßigen Abständen, beispielsweise häufiger als einmal pro Stunde, insbesondere häufiger als einmal pro halber Stunde, besonders bevorzugt häufiger als einmal pro 10 Minuten.The VOC concentration meter comprises, for example, a gas chromatograph with a flame ionization detector. The VOC concentration meter is preferably designed to automatically measure the VOC concentration at regular intervals, for example more frequently than once per hour, in particular more frequently than once per half hour, particularly preferably more frequently than once per 10 minutes.

Vorzugsweise umfasst die Holzfaserstoff-Herstellvorrichtung zudem einen Durchflussmesser zum Messen eines Dampfstroms an abgezweigtem Dampf. Der Dampfstrom kann beispielsweise in Masse pro Zeiteinheit oder Volumen pro Zeiteinheit angegeben werden. Günstig ist es, wenn der Dampfabzweig ausgebildet ist zum Abzweigen eines vorgegebenen Dampfstroms. Beispielsweise besitzt der Dampfabzweig ein Ventil, das mittels einer Regelung angesteuert wird, wobei die Regelung mit dem Durchflussmesser verbunden ist. Auf diese Weise wird das Ventil so angesteuert, dass sich stets ein vorgegebener Soll-Dampfstrom ergibt.Preferably, the wood pulp manufacturing device also comprises a flow meter for measuring a steam flow of branched steam. The steam flow can be specified, for example, in mass per unit of time or volume per unit of time. It is advantageous if the steam branch is designed to branch off a predetermined steam flow. For example, the steam branch has a valve that is controlled by means of a controller, the controller being connected to the flow meter. In this way, the valve is controlled in such a way that a predetermined target steam flow is always achieved.

In einer bevorzugten Ausführungsform ist der Zudosierer ausgebildet zum Erfassen der VOC-Konzentration vom VOC-Konzentrationsmesser und zum automatischen Einbringen des Oxidationsmittels in den abgezweigten Dampf anhand der VOC-Konzentration und des Dampfstroms. In anderen Worten wird ein Oxidationsmittelvolumenstrom an Oxidationsmittel, der pro Zeiteinheit in den abgezweigten Dampf eingebracht wird, insbesondere anhand der VOC-Konzentration und gegebenenfalls des Dampfstroms berechnet und dann das Oxidationsmittel entsprechend eingebracht.In a preferred embodiment, the feeder is designed to detect the VOC concentration from the VOC concentration meter and to automatically introduce the oxidizing agent into the branched steam based on the VOC concentration and the steam flow. In other words, an oxidizing agent volume flow of oxidizing agent that is introduced into the branched steam per unit of time is calculated in particular based on the VOC concentration and, if applicable, the steam flow, and the oxidizing agent is then introduced accordingly.

Die Holzfaserstoff-Herstellvorrichtung besitzt vorzugsweise eine erste Einbringvorrichtung zum Einbringen des Oxidationsmittels in den abgezweigten Dampf an einer ersten Einbringstelle.The wood pulp manufacturing device preferably has a first introduction device for introducing the oxidizing agent into the branched steam at a first introduction point.

Besonders günstig ist es, wenn der Dampfreiniger ausgebildet ist zum Regeln der VOC-Konzentration auf eine vorgegebene VOC-Soll-Konzentration. Bei Abweichung der gemessenen VOC-Konzentration von der VOC-Soll-Konzentration wird der Oxidationsmittelvolumenstrom so angepasst, dass sich die gemessene VOC-Konzentration der VOC-Soll-Konzentration annähert. Liegt die gemessene VOC-Konzentration oberhalb der VOC-Soll-Konzentration, wird der Oxidationsmittelvolumenstrom erhöht. Liegt die gemessene VOC-Konzentration unterhalb der VOC-Soll-Konzentration, wird der Oxidationsmittelvolumenstrom verringert.It is particularly advantageous if the steam cleaner is designed to regulate the VOC concentration to a predetermined VOC target concentration. If the measured VOC concentration deviates from the VOC target concentration, the oxidizing agent volume flow is adjusted so that the measured VOC concentration approaches the VOC target concentration. If the measured VOC concentration is above the VOC target concentration, the oxidizing agent volume flow is increased. If the measured VOC concentration is below the VOC target concentration, the oxidizing agent volume flow is reduced.

Gemäß einer bevorzugten Ausführungsform besitzt die Holzfaserstoff-Herstellvorrichtung einen zweiten VOC-Konzentrationsmesser zum Messen einer zweiten VOC-Konzentration (oder einer zweiten TOC-Konzentration) im abgezweigten Dampf in Dampfflussrichtung hinter der Einbringstelle, wobei der Zudosierer ausgebildet ist zum automatischen Einbringen des Oxidationsmittels in den abgezweigten Dampf anhand der ersten VOC-Konzentration und der zweiten VOC-Konzentration, sowie gegebenenfalls des Dampfstroms. In anderen Worten ist der Zudosierer ausgebildet zum Steuern oder Regeln des Oxidationsmittelvolumenstroms anhand der ersten und der zweiten VOC-Konzentration.According to a preferred embodiment, the wood pulp manufacturing device has a second VOC concentration meter for measuring a second VOC concentration (or a second TOC concentration) in the branched steam in the steam flow direction behind the introduction point, wherein the feeder is designed to automatically introduce the oxidizing agent into the branched steam based on the first VOC concentration and the second VOC concentration, and optionally the steam flow. In other words, the feeder is designed to control or regulate the oxidizing agent volume flow based on the first and the second VOC concentration.

Die Holzfaserstoff-Herstellvorrichtung besitzt vorzugsweise eine zweite Einbringvorrichtung zum Einbringen des Oxidationsmittels in den abgezweigten Dampf an einer zweiten Einbringstelle, die in Dampfflussrichtung hinter der ersten Einbringstelle liegt. Vorzugsweise liegt die zweite Einbringstelle hinter dem zweiten VOC-Konzentrationsmesser. Günstig ist es, wenn der Dampfreiniger ausgebildet ist zum Steuern eines zweiten Oxidationsmittelvolumenstroms an Oxidationsmittel, der an der zweiten Einbringstelle eingebracht wird, in Abhängigkeit von der zweiten VOC-Konzentration.The wood pulp manufacturing device preferably has a second introduction device for introducing the oxidizing agent into the branched steam at a second introduction point which is located behind the first introduction point in the direction of steam flow. The second introduction point is preferably located behind the second VOC concentration meter. It is advantageous if the steam cleaner is designed to control a second oxidizing agent volume flow of oxidizing agent which is introduced at the second introduction point, depending on the second VOC concentration.

Besonders günstig ist es, wenn der Dampfreiniger ausgebildet ist zum Regeln der zweiten VOC-Konzentration auf eine vorgegebene zweite VOC-Soll-Konzentration. Bei Abweichung der gemessenen zweiten VOC-Konzentration von der zweiten VOC-Soll-Konzentration wird der erste und/oder zweite Oxidationsmittelvolumenstrom so angepasst, dass sich die gemessene zweite VOC-Konzentration der zweiten VOC-Soll-Konzentration annähert. Liegt die gemessene zweite VOC-Konzentration oberhalb der zweiten VOC-Soll-Konzentration, werden der erste und/oder der zweite Oxidationsmittelvolumenstrom erhöht. Liegt die gemessene zweite VOC-Konzentration unterhalb der zweiten VOC-Soll-Konzentration, werden der erste und/oder der zweite Oxidationsmittelvolumenstrom verringert.It is particularly advantageous if the steam cleaner is designed to regulate the second VOC concentration to a predetermined second VOC target concentration. If the measured second VOC concentration deviates from the second VOC target concentration, the first and/or second oxidizing agent volume flow is adjusted so that the measured second VOC concentration approaches the second VOC target concentration. If the measured second VOC concentration is above the second VOC target concentration, the first and/or second Oxidizing agent volume flow is increased. If the measured second VOC concentration is below the second VOC target concentration, the first and/or second oxidizing agent volume flow is reduced.

Vorzugsweise weist die Holzfaserstoff-Herstellvorrichtung einen Beleimer zum Beleimen des Fasermaterials auf. Unter einem Beleimer wird eine Vorrichtung verstanden, mittels der das Fasermaterial beleimt werden kann.Preferably, the wood fiber production device has a hopper for applying glue to the fiber material. A hopper is understood to be a device by means of which the fiber material can be glued.

Vorzugsweise ist die Holzfaserstoff-Herstellvorrichtung ein Teil einer erfindungsgemäßen Holzfaserplatten-Herstellvorrichtung zum Herstellen von leichten, mitteldichten Faserplatten (LDF), mitteldichten Faserplatten (MDF) und/oder hochdichten Faserplatten (HDF). Erfindungsgemäß ist damit auch eine Holzfaserplatten-Herstellvorrichtung zum Herstellen einer Holzfaserplatte, insbesondere einer MDF-Platte, mit (a) einem Kocher zum Kochen von Holzhackschnitzeln mittels Dampf, sodass gekochte Holzhackschnitzeln entstehen, (b) einem Refiner, der in Holzmaterialflussrichtung hinter dem Kocher angeordnet ist, zum Zerfasern der gekochten Holzhackschnitzeln, sodass Fasermaterial entsteht und optional (c) einem in Holzmaterialflussrichtung hinter dem Refiner angeordneten Beleimer, insbesondere einer Blow-Line, zum Beleimen des Fasermaterials, sodass beleimtes Fasermaterial entsteht. In Holzmaterialflussrichtung hinter dem Refiner und vor dem Beleimer, insbesondere einer Blow-Line, ist Dampfabzweig zum Abzweigen von Dampf angeordneter und die Holzfaserstoff-Herstellvorrichtung besitzt einem Dampfreiniger, der ausgebildet ist zum Einbringen eines Oxidationsmittels in den Dampf, sodass im Dampf enthaltene volatile organische Substanzen oxidiert werden und gereinigter Dampf entsteht.Preferably, the wood fiber production device is part of a wood fiber board production device according to the invention for producing light, medium density fiber boards (LDF), medium density fiber boards (MDF) and/or high density fiber boards (HDF). The invention also provides a wood fiber board production device for producing a wood fiber board, in particular an MDF board, with (a) a cooker for cooking wood chips using steam so that cooked wood chips are produced, (b) a refiner, which is arranged behind the cooker in the direction of wood material flow, for defibrating the cooked wood chips so that fiber material is produced and optionally (c) a blower, in particular a blow line, arranged behind the refiner in the direction of wood material flow, for gluing the fiber material so that glued fiber material is produced. In the direction of wood material flow behind the refiner and before the blower, in particular a blow line, a steam branch for branching off steam is arranged and the wood pulp production device has a steam cleaner which is designed to introduce an oxidizing agent into the steam so that volatile organic substances contained in the steam are oxidized and purified steam is produced.

Unter einer Holzfaserplatte eine Platte verstanden, die unter Verwendung von Holz hergestellt wird. Vorzugsweise hat die Holzfaserplatte eine Dicke zwischen 2 mm und 60 mm. Vorzugsweise beträgt eine Dichte der Holzfaserplatte zwischen 600 kg pro Kubikmeter und 1000 kg pro Kubikmeter. Die Holzhackschnitzel sind vorzugsweise Hackschnitzel.A wood fiber board is understood to mean a board that is made using wood. The wood fiber board preferably has a thickness of between 2 mm and 60 mm. The density of the wood fiber board is preferably between 600 kg per cubic meter and 1000 kg per cubic meter. The wood chips are preferably wood chips.

Das Beleimen kann beispielsweise mittels einer Blow-Line erfolgen. Ein Beleimer ist vorzugsweise in Holzmaterialflussrichtung hinter dem Dampfabzweig angeordnet.Gluing can be done using a blow line, for example. A blow line is preferably arranged behind the steam branch in the direction of wood material flow.

Im Folgenden wird die Erfindung anhand der beigefügten Zeichnung näher erläutert. Dabei zeigt

Figur 1
ein Flussdiagramm einer erfindungsgemäßen Holzfaserstoff-Herstellvorrichtung zum Durchführen eines erfindungsgemäßen Verfahrens und
Figur 2
ein Flussdiagramm einer erfindungsgemäßen Holzfaserplatten-Herstellvorrichtung zum Durchführen eines erfindungsgemäßen Verfahrens gemäß einer zweiten Ausführungsform.
The invention is explained in more detail below with reference to the accompanying drawing.
Figure 1
a flow chart of a wood pulp manufacturing device according to the invention for carrying out a method according to the invention and
Figure 2
a flow chart of a wood fiber board manufacturing device according to the invention for carrying out a method according to the invention according to a second embodiment.

Figur 1 zeigt Flussdiagramm einer erfindungsgemäßen Holzfaserstoff-Herstellvorrichtung 10 zum Herstellen von Holzfaserstoff 11. Die Holzfaserstoff-Herstellvorrichtung 10 besitzt einen Kocher 14, der von einem Vorkocher 16 erwärmte Holzhackschnitzel 18 erhält. Die Holzhackschnitzel 18 wurden vor dem Einbringen in den Vorkocher 16 mittels einer Waschanlage 24 gereinigt. In Holzmaterialflussrichtung H hinter dem Kocher 14 ist eine Refiner 32 angeordnet, mittels dem die aus dem Kocher 14 kommenden Holzhackschnitzeln 18 zerfasert werden. Zusammen mit Dampf 26 entsteht so ein Dampf-Fasermaterial-Gemisch 38. Figure 1 shows a flow diagram of a wood fiber production device 10 according to the invention for producing wood fiber 11. The wood fiber production device 10 has a cooker 14 which receives heated wood chips 18 from a pre-cooker 16. The wood chips 18 were cleaned by means of a washing system 24 before being introduced into the pre-cooker 16. A refiner 32 is arranged behind the cooker 14 in the wood material flow direction H, by means of which the wood chips 18 coming from the cooker 14 are shredded. Together with steam 26, a steam-fiber material mixture 38 is thus created.

Mittels eines Dampfabzweigs 36 wird Dampf 26 aus dem Dampf-Fasermaterial-Gemisch 38 abgezweigten und in eine Abdampfleitung 69 eingespeist. In der Abdampfleitung 69 ist ein Dampfreiniger 52 angeordnet. Der Dampfreiniger 52 funktioniert wie unten im Zusammenhang mit Figur 2 beschrieben.By means of a steam branch 36, steam 26 is branched off from the steam-fiber material mixture 38 and fed into an exhaust steam line 69. A steam cleaner 52 is arranged in the exhaust steam line 69. The steam cleaner 52 functions as described below in connection with Figure 2 described.

Das Dampf-Fasermaterial-Gemisch 38 kann einem Beleimer 40, der vorzugsweise als Blow-Line ausgeführt ist, zugeführt werden, das ist aber nicht notwendig. Das Dampf-Fasermaterial-Gemisch 38 wird einem Trockner 44 zugeleitet, den Dampf 26 und getrockneter Holzfaserstoff 11 verlassen.The steam-fiber material mixture 38 can be fed to a blower 40, which is preferably designed as a blow line, but this is not necessary. The steam-fiber material mixture 38 is fed to a dryer 44, from which steam 26 and dried wood fiber 11 leave.

Der Holzfaserstoff 11 wird beispielsweise zur Herstellung von Dämmmaterial, von mitteldichten Holzfaserplatten (MDF), leichten mitteldichten Holzfaserplatten (LDF), hochdichten Holzfaserplatten (HDF), Pflanzen-Substrat für den Pflanzenbau, beispielsweise Blumenerde, oder Verpackungsmaterial verwendet.The wood pulp 11 is used, for example, for the production of insulation material, medium-density fiberboards (MDF), lightweight medium-density fiberboards (LDF), high-density fiberboards (HDF), plant substrate for plant cultivation, for example potting soil, or packaging material.

Figur 2 zeigt das Flussdiagramm einer erfindungsgemäßen Holzfaserplatten-Herstellvorrichtung 10 zum Herstellen einer Holzfaserplatte 12 in Form einer MDF-Platte. Figure 2 shows the flow chart of a wood fiber board manufacturing device 10 according to the invention for producing a wood fiber board 12 in the form of an MDF board.

Der Vorkocher 16 wird mit den Holzhackschnitzeln 18 beschickt, die beispielsweise mittels eines Hackers 20 hergestellt und danach gegebenenfalls in der Waschanlage 24 gewaschen werden. Als Rohmaterial kann Rundholz 22 verwendet werden, andere Quellen von Holz sind aber auch möglich. Im Vorkocher 16 werden die Hackschnitzel 14 mit heißem Wasser und/oder Dampf 26' erhitzt. Das Wasser oder der Dampf 26' können mittels eines Kessels erzeugt werden. Aus dem Vorkocher 16 gelangen die erwärmten Holzhackschnitzel 18 in den Kocher 14.The pre-cooker 16 is fed with the wood chips 18, which are produced, for example, using a chipper 20 and then optionally washed in the washing system 24. Round wood 22 can be used as the raw material, but other sources of wood are also possible. In the pre-cooker 16, the wood chips 14 are heated with hot water and/or steam 26'. The water or steam 26' can be generated using a boiler. The heated wood chips 18 pass from the pre-cooker 16 into the cooker 14.

In Holzmaterialflussrichtung H hinter dem Kocher 14 gelangt das entstehende Dampf-Holzhackschnitzel-Gemisch 30 in den Refiner 32, in dem das Fasermaterial 34 entsteht. In Holzmaterialflussrichtung H hinter dem Refiner 32 ist der Dampfabzweig 36 angeordnet, mittels dem der Dampf 26 abgezweigt werden kann. Beispielsweise werden 20 bis 30 Massenprozent des Dampfs, der im Dampf-Fasermaterial-Gemisch 38 enthalten ist, abgezweigt.In the wood material flow direction H behind the cooker 14, the resulting steam-wood chip mixture 30 reaches the refiner 32, in which the fiber material 34 is produced. In the wood material flow direction H behind the refiner 32, the steam branch 36 is arranged, by means of which the steam 26 can be branched off. For example, 20 to 30 percent by mass of the steam contained in the steam-fiber material mixture 38 is branched off.

Das verbleibende Dampf-Fasermaterial-Gemisch 38 wird einer Blow-Line 40 zugeführt und dort mit Leim versehen. Das so entstehende beleimte Fasermaterial 42 gelangt in einen Trockner 44, wo es getrocknet wird. Das getrocknete Fasermaterial 42 wird dann einem Streuer 46 zugeführt, der einen Faserkuchen 48 streut. Der Faserkuchen 48 wird mittels einer Presse 50 zur Holzfaserplatte 12 verpresst.The remaining steam-fiber material mixture 38 is fed to a blow line 40 and provided with glue there. The glued fiber material 42 thus produced is fed to a dryer 44 where it is dried. The dried fiber material 42 is then fed to a spreader 46 which spreads a fiber cake 48. The fiber cake 48 is pressed into the wood fiber board 12 using a press 50.

Der in Dampfflussrichtung D hinter dem Dampfabzweig 36 angeordnete Dampfreiniger 52 bringt an einer Einbringstelle 54 ein Oxidationsmittel 56 in den abgezweigten Dampf 26 ein. Im vorliegenden Fall ist das Oxidationsmittel Wasserstoffperoxid.The steam cleaner 52 arranged behind the steam branch 36 in the steam flow direction D introduces an oxidizing agent 56 into the branched steam 26 at an introduction point 54. In the present case, the oxidizing agent is hydrogen peroxide.

Der Dampfreiniger 52 umfasst eine Oxidationsmittelquelle 58, die im vorliegenden Fall einen Oxidationsmittelbehälter 58 und einen Zudosierer 60 in Form einer Oxidationsmittelpumpe. Mittels eines VOC-Konzentrationsmessers 62 misst der Dampfreiniger 52 eine erste VOC-Konzentration cVOC,1 an volatilen organischen Komponenten im abgezweigten Dampf 26. In Abhängigkeit von der VOC-Konzentration wird ein Oxidationsmittelvolumenstrom Q56 an Oxidationsmittel 56 mittels einer Einbringvorrichtung 57 in den abgezweigten Dampf 26 eingebracht, beispielsweise eingedüst. Das Oxidationsmittel 56 reagiert mit volatilen organischen Komponenten im abgezweigten Dampf.The steam cleaner 52 comprises an oxidizing agent source 58, which in the present case comprises an oxidizing agent container 58 and a dosing device 60 in the form of an oxidizing agent pump. By means of a VOC concentration meter 62, the steam cleaner 52 measures a first VOC concentration c VOC,1 of volatile organic components in the branched steam 26. Depending on the VOC concentration, a Oxidizing agent volume flow Q 56 of oxidizing agent 56 is introduced, for example sprayed, into the branched steam 26 by means of an introduction device 57. The oxidizing agent 56 reacts with volatile organic components in the branched steam.

Der Dampfreiniger 52 kann einen zweiten VOC-Konzentrationsmesser 64 aufweisen, der in Dampfflussrichtung D hinter der Einbringstelle 54 liegt. Der zweite VOC-Konzentrationsmesser misst eine zweite VOC-Konzentration cVOC,2. Im vorliegenden Fall handelt es sich um die TOC-Konzentration der Gesamtkonzentration organischer Verbindungen. Liegt die zweite VOC-Konzentration cVOC,2 oberhalb einer vorgegebene Maximal-Konzentration cVOC,max, so wird der Oxidationsmittelvolumenstrom Q56 erhöht.The steam cleaner 52 can have a second VOC concentration meter 64, which is located behind the introduction point 54 in the steam flow direction D. The second VOC concentration meter measures a second VOC concentration c VOC,2 . In the present case, this is the TOC concentration of the total concentration of organic compounds. If the second VOC concentration c VOC,2 is above a predetermined maximum concentration c VOC,max , the oxidizing agent volume flow Q 56 is increased.

Der Dampfreiniger 52 regelt durch Erhöhen oder Vermindern des Oxidationsmittelvolumenstroms Q56 die zweite VOC-Konzentration cVOC,2 auf eine VOC-Soll-Konzentration cVOC,soll.The steam cleaner 52 regulates the second VOC concentration c VOC,2 to a VOC target concentration c VOC , target by increasing or decreasing the oxidizing agent volume flow Q 56 .

Alternativ ist es möglich, dass der Dampfreiniger 52 in Dampfflussrichtung D hinter dem zweiten VOC-Konzentrationsmesser 64 eine Einbringvorrichtung, beispielsweise eine Düse 66, zum Einbringen von Oxidationsmittel an einer zweiten Einbringstelle 54` aufweist. Alternativ ist es möglich, dass der Oxidationsmittelvolumenstrom Q56 erhöht wird, wenn die zweite VOC-Konzentration cVOC,2. oberhalb der Maximal-Konzentration cVOC,max liegt. Es ist möglich, nicht aber notwendig, dass an beiden Einbringstellen 54, 54` das gleiche Oxidationsmittel eingebracht wird. Insbesondere ist es möglich, dass 2 unterschiedliche Oxidationsmittel verwendet werden.Alternatively, it is possible for the steam cleaner 52 to have an introduction device, for example a nozzle 66, for introducing oxidizing agent at a second introduction point 54' behind the second VOC concentration meter 64 in the steam flow direction D. Alternatively, it is possible for the oxidizing agent volume flow Q 56 to be increased if the second VOC concentration c VOC,2 is above the maximum concentration c VOC,max . It is possible, but not necessary, for the same oxidizing agent to be introduced at both introduction points 54, 54'. In particular, it is possible for 2 different oxidizing agents to be used.

Durch das Einbringen des Oxidationsmittels entsteht gereinigter Dampf 68, der Vorkocher 16 mittels einer Abdampfleitung 69 zugeführt wird.By introducing the oxidizing agent, purified steam 68 is produced, which is fed to the pre-cooker 16 via an exhaust steam line 69.

Der Dampfreiniger 52 kann eine Lichtquelle 74 aufweisen, mittels der das Oxidationsmittel 56 mit UV-Licht bestrahlt werden kann. Auf diese Weise bilden sich Hydroxylradikale, die die volatilen organischen Substanzen im abgezweigten Dampf 26 besonders effektiv zerstören.The steam cleaner 52 can have a light source 74 by means of which the oxidizing agent 56 can be irradiated with UV light. In this way, hydroxyl radicals are formed, which particularly effectively destroy the volatile organic substances in the diverted steam 26.

Bei der in Figur 2 gezeigten Holzfaserplatten-Herstellvorrichtung 10 werden beispielsweise 2, 5 ±0,5 t Dampf pro Stunde vom Dampfabzweig 36 abgezweigt. Statt vom Abzweigen kann auch vom Ausschleusen gesprochen werden.At the Figure 2 In the wood fiber board manufacturing device 10 shown, for example, 2.5 ±0.5 t of steam per hour are branched off from the steam branch 36. Instead of branching off, one can also speak of discharging.

Eine Dampftemperatur T26 beträgt beispielsweise 140°C ± 5°C. Der erste VOC-Konzentrationsmesser 62 misst eine ersten VOC-Konzentration von cVOC,1 = 350 mg/Kubikmeter. Daraufhin wird der Oxidationsmittelvolumenstrom auf Q56 = 125 Liter/Stunde eingestellt. Das Oxidationsmittel 56 ist in diesem Fall eine 10 prozentige (Gewichtsprozent) Wasserstoffperoxidlösung. Der zweite VOC-Konzentrationsmesser 64 misst dann eine zweite VOC-Konzentration von cVOC,2 = cTOC,2 =30 mg/Kubikmeter. Das entspricht einer Reduktion um über 90 %.A steam temperature T 26 is, for example, 140°C ± 5°C. The first VOC concentration meter 62 measures a first VOC concentration of c VOC,1 = 350 mg/cubic meter. The oxidizing agent volume flow is then set to Q 56 = 125 liters/hour. The oxidizing agent 56 in this case is a 10 percent (weight percent) hydrogen peroxide solution. The second VOC concentration meter 64 then measures a second VOC concentration of c VOC,2 = c TOC,2 = 30 mg/cubic meter. This corresponds to a reduction of over 90%.

BezugszeichenlisteList of reference symbols

1010 Holzfaserplatten-HerstellvorrichtungWood fibreboard manufacturing device 6060 ZudosiererDoser 1111 HolzfaserstoffWood pulp 6262 erster VOC-Konzentrationsmes-serfirst VOC concentration meter 1212 HolzfaserplatteWood fibreboard 1414 Kochercooker 6464 zweiter VOC-Konzentrations-messersecond VOC concentration meter 1616 VorkocherPre-cooker 1818 (Hack-)schnitzel(Minced) chips 6666 zweite Einbringvorrichtung, zweite Düsesecond feeder, second nozzle 2020 Hackerhacker 6868 gereinigter Dampfpurified steam 2222 RundholzRoundwood 6969 AbdampfleitungExhaust steam line 2424 WaschanlageCar wash 2626 Dampfsteam 7070 AbzweigventileBranch valves 7272 Kondensatorcapacitor 3030 Dampf-Holzhackschnitzel-GemischSteam-woodchip mixture 7474 LichtquelleLight source 3232 RefinerRefiner cVOC,1 cVOCs,1 erste VOC-Konzentrationfirst VOC concentration 3434 FasermaterialFibre material cVOC,2 cVOCs,2 zweite VOC-Konzentrationsecond VOC concentration 3636 DampfabzweigSteam branch cVOC,max c VOC,max Maximal-Konzentration and volatilen organischen Verbindungen (VOC)Maximum concentration of volatile organic compounds (VOC) 3838 Dampf-Fasermaterial-GemischSteam-fiber material mixture 4040 Blow-Line, BeleimerBlow-Line, Beleimer cVOC,soll c VOC,should VOC-Soll-KonzentrationVOC target concentration 4242 beleimtes Fasermaterialglued fibre material DD DampfstromrichtungSteam flow direction 4444 Trocknerdryer HH HolzstromrichtungWood flow direction 4646 StreuerSpreader Q56 Q56 OxidationsmittelvolumenstromOxidant volume flow 4848 FaserkuchenFiber cake T26 T26 DampftemperaturSteam temperature 5050 Pressepress 5252 DampfreinigerSteam cleaner 5454 EinbringstellePlace of entry 54`54` zweite Einbringstellesecond entry point 5656 OxidationsmittelOxidizing agents 5757 Einbringvorrichtung, erste DüseInsertion device, first nozzle 5858 OxidationsmittelbehälterOxidizer container

Claims (13)

Verfahren zum Herstellen eines Holzfaserstoffs, mit den Schritten (a) Erwärmen von Holzhackschnitzeln (18) in einem Vorkocher (16) mittels Wasser oder Dampf (26), (b) danach Kochen der Holzhackschnitzel (18) mittels Dampf (26) in einem Kocher (14), (c) danach Zerfasern der Holzhackschnitzel (18) in einem Refiner (32), sodass Fasermaterial (34) entsteht, (d) wobei ein Teil des Dampfes nach dem Zerfasern abgezweigt und zum Erwärmen der Holzhackschnitzel (18) im Vorkocher (16) verwendet wird,
gekennzeichnet durch den Schritt (e) Einbringen eines Oxidationsmittels (56) in den abgezweigten Dampf (26), sodass im Dampf (26) enthaltene volatile organische Substanzen oxidiert werden und gereinigter Dampf (68) entsteht, wobei der gereinigte Dampf (68) zumindest teilweise zum Erwärmen der Holzhackschnitzel (18) verwendet wird. A method for producing a wood pulp, comprising the steps (a) heating wood chips (18) in a pre-cooker (16) by means of water or steam (26), (b) then cooking the wood chips (18) by means of steam (26) in a cooker (14), (c) then defibrating the wood chips (18) in a refiner (32) to form fibre material (34), (d) wherein a portion of the steam is diverted after defibration and used to heat the wood chips (18) in the pre-cooker (16),
characterized by the step (e) introducing an oxidizing agent (56) into the branched steam (26) so that volatile organic substances contained in the steam (26) are oxidized and purified steam (68) is produced, the purified steam (68) being used at least partially to heat the wood chips (18). Verfahren nach Anspruch 1, gekennzeichnet durch den Schritt Herstellen von Dämmmaterial, Pflanzen-Substrat für den Pflanzenbau, einer mitteldichten Faserplatte, einer hochdichten Faserplatte oder Verpackungsmaterial aus dem Fasermaterial.Method according to claim 1, characterized by the step of producing insulation material, plant substrate for plant cultivation, a medium-density fiberboard, a high-density fiberboard or packaging material from the fiber material. Verfahren nach einem der vorstehenden Ansprüche, gekennzeichnet durch die Schritte: (a) kontinuierliches Messen einer VOC-Konzentration (cVOC,1) an volatilen organischen Substanzen, insbesondere Terpenen und/oder Aldehyden, im abgezweigten Dampf (26) und (b) Steuern des Einbringens des Oxidationsmittels (56) in den abgezweigten Dampf (26) anhand der VOC-Konzentration (cVOC,1). Method according to one of the preceding claims, characterized by the steps: (a) continuously measuring a VOC concentration (c VOC,1 ) of volatile organic substances, in particular terpenes and/or aldehydes, in the branched off steam (26) and (b) controlling the introduction of the oxidizing agent (56) into the branched steam (26) based on the VOC concentration (c VOC,1 ). Verfahren nach einem der vorstehenden Ansprüche, gekennzeichnet durch die Schritte: (a) kontinuierliches Messen einer zweiten VOC-Konzentration (cVOC,2) an volatilen organischen Substanzen, insbesondere Terpenen und/oder Aldehyden, im abgezweigten Dampf (26) und (b) Steuern des Einbringens des Oxidationsmittels (56) in den abgezweigten Dampf (26) anhand der zweiten VOC-Konzentration (cVOC,2). Method according to one of the preceding claims, characterized by the steps: (a) continuously measuring a second VOC concentration (c VOC,2 ) of volatile organic substances, in particular terpenes and/or aldehydes, in the branched off steam (26) and (b) controlling the introduction of the oxidizing agent (56) into the branched steam (26) based on the second VOC concentration (c VOC,2 ). Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass (a) der Refiner (32) ein Fasermaterial-Dampf-Gemisch (38) abgibt und (b) höchstens 40 Masseprozent und/oder zumindest 10 Masseprozent des Dampfs (26) im Fasermaterial-Dampf-Gemisch (38) abgezweigt werden. Method according to one of the preceding claims, characterized in that (a) the refiner (32) delivers a fibre material-steam mixture (38) and (b) at most 40 mass percent and/or at least 10 mass percent of the steam (26) in the fiber material-steam mixture (38) is branched off. Verfahren nach einem der vorstehenden Ansprüche, gekennzeichnet durch den Schritt
Bestrahlen des Oxidationsmittels (56) mit UV-Licht, sodass das Oxidationsmittel (56) Radikale bildet.Method according to one of the preceding claims, characterized by the step
Irradiating the oxidizing agent (56) with UV light so that the oxidizing agent (56) forms radicals. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der abgezweigte Dampf (26) beim Einbringen des Oxidationsmittels (56) (a) eine Dampftemperatur (T26) von 110°C bis 160°C hat und/oder (b) einen Druck von zumindest 2 bar und/oder höchstens 5 bar hat. Method according to one of the preceding claims, characterized in that the branched steam (26) during the introduction of the oxidizing agent (56) (a) has a steam temperature (T 26 ) of 110°C to 160°C and/or (b) has a pressure of at least 2 bar and/or at most 5 bar. Verfahren nach einem der vorstehenden Ansprüche, gekennzeichnet durch die Schritte (a) Beleimen des Fasermaterials (34) in einem Beleimer (40), insbesondere einer Blow-Line, sodass beleimtes Fasermaterial (42) entsteht, (a) Streuen des beleimten Fasermaterials (34) zu einem Faserkuchen (48) und (b) Verpressen des Faserkuchens (48) zur Holzfaserplatte (12). Method according to one of the preceding claims, characterized by the steps (a) gluing the fibre material (34) in a gluing bucket (40), in particular a blow line, so that glued fibre material (42) is produced, (a) spreading the glued fiber material (34) to form a fiber cake (48) and (b) Pressing the fibre cake (48) into the wood fibre board (12). Holzfaserstoff-Herstellvorrichtung zum Herstellen eines Holzfaserstoffs, mit (a) einem Vorkocher (16) zum Erwärmen von Holzhackschnitzeln (18) mittels Wasser oder Dampf (26), (b) einem Kocher (14), der in Holzmaterialflussrichtung (H) hinter dem Vorkocher (16) angeordnet ist, zum Kochen der Holzhackschnitzel (18), mittels Dampf (26), (c) einem Refiner (32), der in Holzmaterialflussrichtung (H) hinter dem Kocher (14) angeordnet ist, zum Zerfasern der Holzhackschnitzel (18), sodass Fasermaterial (34) entsteht, (f) einem in Holzmaterialflussrichtung (H) hinter dem Refiner angeordneten Dampfabzweig (36) zum Abzweigen eines Teils des Dampfs (26) nach dem Zerfasern und (d) einer Abdampfleitung (69), die den Dampfabzweig (36) mit dem Vorkocher (16) zum Zuführen von Dampf (26) verbindet,
gekennzeichnet durch (e) einen Dampfreiniger (52), der ausgebildet ist zum Einbringen eines Oxidationsmittels (56) in den Dampf (26), sodass im Dampf (26) enthaltene volatile organische Substanzen oxidiert werden und gereinigter Dampf (68) entsteht. Wood pulp manufacturing device for producing a wood pulp, with (a) a pre-cooker (16) for heating wood chips (18) by means of water or steam (26), (b) a cooker (14) arranged behind the pre-cooker (16) in the wood material flow direction (H) for cooking the wood chips (18) by means of steam (26), (c) a refiner (32) arranged behind the cooker (14) in the direction of wood material flow (H) for defibrating the wood chips (18) to produce fibrous material (34), (f) a steam branch (36) arranged behind the refiner in the wood material flow direction (H) for branching off a portion of the steam (26) after defibration and (d) an exhaust steam line (69) connecting the steam branch (36) to the pre-cooker (16) for supplying steam (26),
characterized by (e) a steam cleaner (52) designed to introduce an oxidizing agent (56) into the steam (26) so that volatile organic substances contained in the steam (26) are oxidized and purified steam (68) is produced. Holzfaserstoff-Herstellvorrichtung nach Anspruch 9, gekennzeichnet durch (a) einen VOC-Konzentrationsmesser (62) zum Messen einer VOC-Konzentration (cVOC,1) an volatilen organischen Substanzen, insbesondere Terpenen und/oder Aldehyden, im abgezweigten Dampf (26) in Dampfflussrichtung (D) vor einer Einbringstelle (54), an der das Oxidationsmittel (56) in den Dampf (26) eingebracht wird, und (b) einen Zudosierer (60), der ausgebildet ist zum automatischen Einbringen des Oxidationsmittels (56) in den abgezweigten Dampf (26) anhand der VOC-Konzentration (cVOC,1). Wood pulp manufacturing device according to claim 9, characterized by (a) a VOC concentration meter (62) for measuring a VOC concentration (c VOC,1 ) of volatile organic substances, in particular terpenes and/or aldehydes, in the branched steam (26) in the steam flow direction (D) upstream of an introduction point (54) at which the oxidizing agent (56) is introduced into the steam (26), and (b) a dosing device (60) which is designed to automatically introduce the oxidizing agent (56) into the branched steam (26) based on the VOC concentration (c VOC,1 ). Holzfaserstoff-Herstellvorrichtung nach einem der Ansprüche 9 oder 10,
gekennzeichnet durch (a) einen zweiten VOC-Konzentrationsmesser (64) zum Messen einer zweiten VOC-Konzentration (cVOC,2) im abgezweigten Dampf (26) in Dampfflussrichtung (D) hinter der Einbringstelle (54), (b) wobei der Zudosierer (60) ausgebildet ist zum automatischen Einbringen des Oxidationsmittels (56) in den abgezweigten Dampf (26) anhand der ersten VOC-Konzentration und der zweiten VOC-Konzentration. Wood pulp manufacturing apparatus according to one of claims 9 or 10,
characterized by (a) a second VOC concentration meter (64) for measuring a second VOC concentration (c VOC,2 ) in the branched steam (26) in the steam flow direction (D) behind the introduction point (54), (b) wherein the feeder (60) is designed to automatically introduce the oxidizing agent (56) into the branched steam (26) based on the first VOC concentration and the second VOC concentration. Holzfaserstoff-Herstellvorrichtung nach einem der Ansprüche 9 bis 11, gekennzeichnet durch
eine Einbringvorrichtung (66), die ausgebildet ist zum Einbringen von Oxidationsmittel (56) in den abgezweigten Dampf an einer zweiten Einbringstelle (54`), die in Dampfflussrichtung (D) hinter Stelle liegt, an der die zweite VOC-Konzentration (cVOC,2) gemessen wird.Wood pulp manufacturing device according to one of claims 9 to 11, characterized by
an introduction device (66) which is designed to introduce oxidizing agent (56) into the branched steam at a second introduction point (54') which is located in the steam flow direction (D) behind the point at which the second VOC concentration (c VOC,2 ) is measured. Holzfaserplatten-Herstellvorrichtung nach einem der Ansprüche 9 bis 11, gekennzeichnet durch (a) einen in Holzmaterialflussrichtung (H) hinter dem Refiner (32) angeordneten Beleimer (40), insbesondere einer Blow-Line, zum Beleimen des Fasermaterials (34), sodass beleimtes Fasermaterial entsteht, (b) einen Trockner (44), der in Holzmaterialflussrichtung (H) hinter dem Beleimer (40) angeordnet ist, zum Trocknen des beleimten Fasermaterials (34), (c) einem Streuer (46) zum Streuen von getrocknetem Fasermaterial (34) zu einem Faserkuchen (48) und (d) einer Presse (50), insbesondere einer Bandpresse, zum Verpressen des Faserkuchens (48) zur Holzfaserplatte (12). Wood fibre board manufacturing device according to one of claims 9 to 11, characterized by (a) a blower (40), in particular a blow line, arranged behind the refiner (32) in the direction of wood material flow (H) for applying glue to the fibre material (34) so that glued fibre material is produced, (b) a dryer (44) arranged behind the bin (40) in the wood material flow direction (H) for drying the glued fibre material (34), (c) a spreader (46) for spreading dried fiber material (34) into a fiber cake (48) and (d) a press (50), in particular a belt press, for pressing the fibre cake (48) to form the wood fibre board (12).
EP23163742.2A 2023-03-23 2023-03-23 Method for producing a wood fibre fabric and wood fibre fabric production device Pending EP4435175A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP23163742.2A EP4435175A1 (en) 2023-03-23 2023-03-23 Method for producing a wood fibre fabric and wood fibre fabric production device
PCT/EP2024/057236 WO2024194290A1 (en) 2023-03-23 2024-03-19 Process for producing a wood fibre material, and wood fibre material production device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23163742.2A EP4435175A1 (en) 2023-03-23 2023-03-23 Method for producing a wood fibre fabric and wood fibre fabric production device

Publications (1)

Publication Number Publication Date
EP4435175A1 true EP4435175A1 (en) 2024-09-25

Family

ID=85726575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23163742.2A Pending EP4435175A1 (en) 2023-03-23 2023-03-23 Method for producing a wood fibre fabric and wood fibre fabric production device

Country Status (2)

Country Link
EP (1) EP4435175A1 (en)
WO (1) WO2024194290A1 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4915784A (en) * 1989-05-03 1990-04-10 Reynolds Ellis W Process and apparatus for removing contaminants from pulp digester vent gas
US4925527A (en) 1989-02-22 1990-05-15 Ahlstromforetagen Svenska Ab Method for the recovery of turpentine and heat in a refiner pulping process
CA2346915A1 (en) * 1999-02-22 2000-08-31 Alexandr Gorokhov Method for producing cellulose
US6176971B1 (en) * 1998-11-18 2001-01-23 Andritz-Ahlstrom Inc. Heat economy enhancements for the recovery and use of energy obtained from spent cooking liquors
WO2015014451A1 (en) * 2013-08-01 2015-02-05 Andritz Ag System and method for processing fibrous materials
WO2017200470A1 (en) * 2016-05-17 2017-11-23 Valmet Ab Method for generation of clean steam in a continuous digester system
WO2019068180A1 (en) * 2017-10-02 2019-04-11 Fpinnovations Lignin reinforced adhesion of wood composites panel products
US20190232228A1 (en) * 2013-03-08 2019-08-01 Xyleco, Inc. Controlling process gases
EP3872256A1 (en) * 2020-02-28 2021-09-01 Fiberboard GmbH Method for reducing volatile organic compounds from wood chips

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4925527A (en) 1989-02-22 1990-05-15 Ahlstromforetagen Svenska Ab Method for the recovery of turpentine and heat in a refiner pulping process
US4915784A (en) * 1989-05-03 1990-04-10 Reynolds Ellis W Process and apparatus for removing contaminants from pulp digester vent gas
US6176971B1 (en) * 1998-11-18 2001-01-23 Andritz-Ahlstrom Inc. Heat economy enhancements for the recovery and use of energy obtained from spent cooking liquors
CA2346915A1 (en) * 1999-02-22 2000-08-31 Alexandr Gorokhov Method for producing cellulose
US20190232228A1 (en) * 2013-03-08 2019-08-01 Xyleco, Inc. Controlling process gases
WO2015014451A1 (en) * 2013-08-01 2015-02-05 Andritz Ag System and method for processing fibrous materials
WO2017200470A1 (en) * 2016-05-17 2017-11-23 Valmet Ab Method for generation of clean steam in a continuous digester system
WO2019068180A1 (en) * 2017-10-02 2019-04-11 Fpinnovations Lignin reinforced adhesion of wood composites panel products
EP3872256A1 (en) * 2020-02-28 2021-09-01 Fiberboard GmbH Method for reducing volatile organic compounds from wood chips

Also Published As

Publication number Publication date
WO2024194290A1 (en) 2024-09-26

Similar Documents

Publication Publication Date Title
DE19718772B4 (en) Process and plant for the production of wood-based panels
EP0172930B1 (en) Method and apparatus for making chipboard
DE2734832C2 (en)
EP1441884B1 (en) Method and device for wetting wood fibers with a binder fluid
DE3914106A1 (en) METHOD AND INSTALLATION FOR THE CONTINUOUS PRODUCTION OF CHIPBOARD, FIBERBOARD AND THE LIKE
EP3377283B1 (en) Osb (oriented strand board) - wood material board with improved properties and method for producing same
EP0695609A2 (en) Method of preheating a loose material to a set temperature for the manufacture of fibreboards
DE29880083U1 (en) Device for gluing fibers
EP3615288B1 (en) Method for the preparation of osb wood-base panels with reduced emission of volatile organic compounds (vocs)
EP4435175A1 (en) Method for producing a wood fibre fabric and wood fibre fabric production device
DE102006012521B3 (en) Method and device for producing shaped articles, in particular sheets, from lignocellulose-containing fibers
EP3453504B1 (en) Method for the preparation of osb wood-base panels with reduced emission of volatile organic compounds (vocs)
EP1663593B1 (en) High-pressure gluing in a fiber mixer
DE102010034763B3 (en) Process and plant for the treatment of wood for the production of medium density fibreboard
EP4458538A1 (en) Method for producing a wood material and wood material production device
DE10116686C2 (en) Process for the preparation of straw and other annual plants for the production of fiberboard, chipboard and insulation boards as well as wall elements and other molded parts and process for the production of fiberboard, chipboard and insulation boards as well as wall elements and other molded parts
WO2021116466A1 (en) Method and system for treating olfactorily loaded materials
DE4415276A1 (en) Mfr. of boards of derived timber product
DE19606262C1 (en) Medium density fibreboard rapid prodn. achieved by steam shock heating
EP3741532B1 (en) Wood material board production assembly and method for manufacturing wood material boards
DE102005053981B4 (en) Method and device for introducing steam into a mat or in its cover layers
EP3150345B1 (en) Wood fiber insulating materials with reduced emission of volatile organic compounds (vocs) and method for their preparation
DE102019114021B3 (en) Method and device for preheating a pressed material mat
EP3192626B1 (en) Method for the treatment of wood dust and assembly for the same
DE1947601A1 (en) Producing chipboards of higher rates - by insuring higher drying where larger quantities of steam may be used during pressing stages

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20240208

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR