FR2989157A1 - Drying oven for accelerated drying of e.g. grains in industrial sector, has resistors placed between corners to ensure instantaneous extraction of moisture, and regulation system automatically subjecting exit temperature to flow - Google Patents
Drying oven for accelerated drying of e.g. grains in industrial sector, has resistors placed between corners to ensure instantaneous extraction of moisture, and regulation system automatically subjecting exit temperature to flow Download PDFInfo
- Publication number
- FR2989157A1 FR2989157A1 FR1200997A FR1200997A FR2989157A1 FR 2989157 A1 FR2989157 A1 FR 2989157A1 FR 1200997 A FR1200997 A FR 1200997A FR 1200997 A FR1200997 A FR 1200997A FR 2989157 A1 FR2989157 A1 FR 2989157A1
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- France
- Prior art keywords
- heating
- treated
- angle
- angles
- oven
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- Pending
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- 238000000605 extraction Methods 0.000 title claims abstract 3
- 238000001035 drying Methods 0.000 title claims description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims 2
- 230000004888 barrier function Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 7
- 230000004907 flux Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005111 flow chemistry technique Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000003442 weekly effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
- F26B3/22—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration
- F26B3/26—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration the movement being performed by gravity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
- F26B17/16—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials passing down a heated surface, e.g. fluid-heated closed ducts or other heating elements in contact with the moving stack of material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Description
Description de l'invention Etat du sachant : Les étuves de flux à soudure ont pour objet de traiter des flux de soudure, afin d'en évacuer l'hydrogène. Le flux de soudure a pour sa part les caractéristiques contraires d'être : - un très bon isolant thermique : ce qui provoque une rampe très longue de montée en température, et amplifie le temps de traitement à l'étuvage, - avide d'humidité : ce qui contraint à obtenir un traitement homogène sur toute le volume traité, et de garantir un maintien à la température de conservation en fin de cycle d'étuvage. Description of the Invention State of the Art: The purpose of welding flux furnaces is to treat solder flows in order to evacuate the hydrogen therefrom. The welding flux has the opposite characteristics of being: - a very good thermal insulation: which causes a very long ramp up temperature, and amplifies the treatment time during baking, - hungry for moisture : this forces to obtain a homogeneous treatment over the whole treated volume, and to guarantee a maintenance at the storage temperature at the end of the baking cycle.
En conséquence, il est très difficile d'obtenir une dessiccation homogène du fait de la caractéristique de la matière à traiter. Les phases de traitement des flux de soudure sont au nombre de trois : - la première consiste à monter le flux de matière à traiter à la température requise, - la seconde consiste à maintenir le flux en phase de chauffage à la température requise dans le but d'extraire tout hydrogène, - la troisième consiste à maintenir hors humidité le flux traité. Les étuves pour le flux de soudure sont caractérisées selon deux technologies : - Les étuves dites à entonnoir : caractérisées par le fait que l'on remplit l'étuve par le dessus, que la matière reste en masse à l'intérieur de l'étuve, que l'étuve se vide par le dessous, et que des éléments chauffants interviennent entre ces deux phases afin de dessécher le flux de soudure. Les limites de cette technologie d'étuve sont que : o Les flux sont traités en masse et une partie est éloignée des corps de chauffe, formant un volume mort (flux mal chauffé, donc moins déshydraté), o Lorsque le flux est évacué, il y a formation d'un cratère centrale, entrainant le coeur du volume de flux qui naturellement concentre l'humidité. Cette caractéristique handicape fortement les performances de ce type d'étuve (temps de montée en chauffe du produit plus important pour pallier au manque d'homogénéité de température, d'où des volumes de traitement limités). - Les étuves armoires : qui se caractérisent par le fait que ces armoires disposent de plateaux à faible rebord, dans lesquels vont reposer les flux en traitement. Bien que la matière traitée ait un rendu plus homogène que les étuves à entonnoir en raison de la meilleure répartition du flux dans le corps de chauffe, cette technologie présente de nombreux inconvénients : o Les temps de traitement restent voisins de l'étuve à entonnoir à puissance égale, o La récupération du flux nécessite une manutention dangereuse, en raison du risque important de brulure, o A volume égal de produit à traiter, la dimension de l'étuve est beaucoup plus importante. Sur l'ensemble des technologies connues : la limite de performance des étuves conduit à devoir respecter un cycle de traitement contraignant, caractérisé par une température d'étuvage variant entre 300° et 400°C, un temps d'étuvage variant de 1 à 4 heures à cette température d'étuvage, et d'une température de conservation supérieure à 100°Celsius. - La seconde limite de ces technologies d'étuve, est qu'il est impossible de traiter des volumes supérieurs à 200 litres, si l'on veut conserver des temps et des couts de traitement acceptables. Hors en milieu industriel le besoin hebdomadaire est en moyenne de 3000 litres, ce qui correspond à la production de trois étuves de 200 litres (soit un besoin de 600 litres journalier en moyenne). - La troisième limite est que les matières sont statiques durant le temps de traitement thermique. Consequently, it is very difficult to obtain a homogeneous desiccation because of the characteristic of the material to be treated. The welding flux treatment phases are three in number: - the first is to mount the flow of material to be treated at the required temperature, - the second is to maintain the flow in the heating phase to the required temperature for the purpose to extract all the hydrogen, - the third consists in keeping the treated flux out of humidity. The furnaces for the flux of welding are characterized by two technologies: - the so-called funnel ovens: characterized by the fact that one fills the oven by the top, that the matter remains en masse inside the oven , that the oven empties from below, and that heating elements intervene between these two phases in order to dry out the flux of solder. The limits of this oven technology are that: o The flows are treated in mass and a part is removed from the heating bodies, forming a dead volume (poorly heated flow, therefore less dehydrated), o When the flow is evacuated, it There is formation of a central crater, driving the heart of the flow volume which naturally concentrates moisture. This characteristic greatly hampers the performance of this type of oven (increased heating time of the product to overcome the lack of temperature homogeneity, resulting in limited processing volumes). - The cabinet ovens: which are characterized by the fact that these cabinets have trays with low rim, in which will rest the flows in treatment. Although the treated material has a more homogeneous rendering than the funnel ovens because of the better distribution of the flow in the heating body, this technology has many disadvantages: o The treatment times are close to the funnel oven. equal power, o Recovery of the flow requires dangerous handling, because of the significant risk of burns, o At equal volume of product to be treated, the size of the oven is much larger. On all known technologies: the performance limit of the ovens leads to having to comply with a binding treatment cycle, characterized by a baking temperature ranging between 300 ° and 400 ° C, a baking time ranging from 1 to 4 hours at this baking temperature, and a storage temperature greater than 100 ° Celsius. - The second limitation of these oven technologies is that it is impossible to handle volumes greater than 200 liters, in order to maintain acceptable treatment times and costs. Except in an industrial setting, the average weekly requirement is 3000 liters, which corresponds to the production of three 200-liter ovens (ie a requirement of 600 liters per day on average). - The third limitation is that the materials are static during the heat treatment time.
Sur les autres domaines d'emploi d'étuves de produits pulvérulents, grains, granulats ou analogues en secteur industriel et agro-alimentaire, nous retrouvons les mêmes technologies d'étuves à entonnoir et armoire, auxquelles se rajoutent des technologies de tunnels de chauffage et de systèmes de soufflerie (l'air évacuée d'humidité sert à la dessiccation de la matière). La limite de tous ces systèmes est de ne pas disposer d'appareils compacts pour traiter des volumes importants. Présentation de l'invention : Le présent procédé d'étuve est caractérisé en ce que les temps de traitement des matières est réduit, ce qui amplifie d'autant le volume pouvant être traité. Pour parvenir à ce résultat, le procédé consiste à faire écouler le produit à traiter à travers une cellule chauffante (constituée de cornières (2) chauffées par des résistances (6)), imbriquées les unes dans les autres de façon à ce que la matière soit chauffée de façon dynamique par couches minces. La vapeur d'eau est évacuée par les faces intérieures des plaques puis vers la cheminée centrale (8) via le trou d'évent (9), empêchant le produit qui s'écoule d'être saturé (un des problèmes des étuves classiques). Un système complexe de régulation (10) intervient sur : - une double régulation de temps: o temps de débit du produit à traiter, o temps de chauffage du produit à traiter. - une double régulation de la température : o sur les résistances, visant à ne pas dépasser la température maximale admissible du produit, o à la sortie de l'étuve, afin de garantir le bon étuvage du produit et de respecter les consignes fixées. Ce procédé permet d'optimiser le débit de produits étuvés à l'heure par le fait que : la montée en température est quasiment instantanée, du fait que les cornières (2) multiples augmentent les surfaces d'échange thermiques et qu'elles sont chauffées à très haute température, le temps de chauffage peut être réduit par le fait que l'ensemble du flux est traité en fines couches sur les cornières, et que l'humidité est extraite au fur et à mesure de l'écoulement du produit grâce aux trous d'évents (9) placés sous chaque cornière, - la phase de maintien en température du produit traité reste inchangée pour éviter la reprise d'humidité tant que le produit n'est pas utilisé, - la matière subie un traitement dynamique, en raison du brassage réalisé à l'intérieur de la cellule chauffante par un passage à travers plusieurs éléments de chauffage superposés, en opposition aux systèmes existants qui traitent la matière sans la retourner. De plus, par la disposition géométrique des éléments superposés (2), et notamment à leur angle (les cornières(2) sont pliées sur un angle maximum de 90° et posées en cône afin d'obtenir un angle maximum de 45° par rapport à la verticale) permettant d'obtenir un bon écoulement, la matière traitée est brassée grâce à un phénomène de gravité assurant le retournement sur lui-même du produit homogénéisant son traitement thermique et réduisant le temps de séchage. In the other fields of use of dryers of powdered products, grains, aggregates or similar in the industrial and agro-food sector, we find the same technologies of funnel and cabinet ovens, to which are added technologies of heating tunnels and blower systems (the air evacuated from moisture is used to dry the material). The limit of all these systems is not to have compact devices to handle large volumes. Presentation of the invention: The present oven method is characterized in that the material treatment times is reduced, which amplifies the volume that can be processed. To achieve this result, the method consists in discharging the product to be treated through a heating cell (consisting of angles (2) heated by resistors (6)), nested one inside the other so that the material is heated dynamically by thin layers. The water vapor is evacuated through the inner faces of the plates and then to the central chimney (8) via the vent hole (9), preventing the product that flows to be saturated (one of the problems of conventional ovens) . A complex system of regulation (10) intervenes on: - a double regulation of time: o time of flow of the product to be treated, o time of heating of the product to be treated. - a double temperature regulation: o on the resistances, aiming not to exceed the maximum permissible temperature of the product, o at the exit of the oven, in order to guarantee the proper baking of the product and to respect the fixed instructions. This process makes it possible to optimize the flow rate of parboiled products by the fact that: the rise in temperature is almost instantaneous, because the multiple angles (2) increase the heat exchange surfaces and are heated at very high temperature, the heating time can be reduced by the fact that the entire flow is treated in thin layers on the angles, and that the moisture is extracted as the product flows through the vent holes (9) placed under each angle, - the temperature-keeping phase of the treated product remains unchanged to prevent the recovery of moisture until the product is used, - the material undergoes a dynamic treatment, in because of the mixing done inside the heating cell by passing through several superimposed heating elements, as opposed to existing systems that process the material without turning it over. In addition, by the geometrical arrangement of the superimposed elements (2), and in particular at their angle (the angles (2) are folded over a maximum angle of 90 ° and placed in a cone in order to obtain a maximum angle of 45.degree. vertically) to obtain a good flow, the treated material is brewed by a phenomenon of gravity ensuring the overturning of the product homogenizing its heat treatment and reducing the drying time.
Ce procédé permet ainsi de réduire au minimum de moitié le temps de traitement des flux pour les rendre exploitable, ce qui correspond à 70% du besoin journalier en milieu industriel. Ce temps peut également se voir réduit par addition de cellules chauffantes supplémentaire, sans avoir à ajouter l'encombrement de l'étuve puisque la cellule chauffante est installée en dessous de l'entonnoir. Les composants du procédé sont les suivants : (1) un réservoir conique ou un autre système d'acheminement va recevoir en sortie l'ensemble de l'équipement ci-après désigné. Le principe du réservoir conique ou de tout autre système d'acheminement est de conduire la matière à traiter dans la cellule chauffante, - La cellule chauffante est constituée de rangées de cornières superposées (2) fixées au centre par des parois centrales (4) constituant la cheminée (8), et des parois terminales (3) et des flans (5) en périphérie : o Ces cornières (2) disposées parallèlement les unes aux autres avec une distance de séparation adaptée au produit à traiter à l'heure, et sur plusieurs rangs superposés décalés pour aligner les faces des cornières, divisent le produit traité en fines couches et le mélangent en le retournant (phénomène de brassage), o La cheminée centrale (8) est positionnée sur toute la largeur de la cellule de façon à récupérer la vapeur d'eau, empêchant ainsi d'enrichir en humidité la matière encours de traitement en amont, o Sous chaque cornière sont disposés des éléments chauffants (6) qui ont pour objet de dessécher la matière, o Sous chaque cornière, en partie supérieure de la paroi centrale, des évents (9) sont disposés de façon à évacuer l'humidité dans la cheminée centrale (8), permettant l'optimisation de la dessiccation, Un système complexe de régulation composé d'un programmeur (10) et de sondes thermiques permettent de gérer les temps d'exposition, et le débit en sortie (système d'écoulement 7) par asservissement des températures de la cellule et de sortie de la matière traitée. Plan A : Vue de face (1/5) Plan B : Vue de gauche (2/5) Plan C : Coupe A.A de la vue de gauche (3/5) Plan D : Coupe B.B de la vue de face (4/5) Plan E : Détail C de la coupe A.A de la cellule chauffante (5/5) This process makes it possible to reduce by at least half the flow processing time to make them exploitable, which corresponds to 70% of the daily need in an industrial environment. This time can also be reduced by adding additional heating cells, without having to add the size of the oven since the heating cell is installed below the funnel. The components of the process are as follows: (1) a conical tank or other conveyor system will receive at the output all of the equipment hereinafter designated. The principle of the conical tank or any other conveyor system is to conduct the material to be treated in the heating cell. - The heating cell consists of rows of superposed angles (2) fixed in the center by central walls (4) constituting the chimney (8), and end walls (3) and blanks (5) peripherally: o These angles (2) arranged parallel to each other with a separation distance adapted to the product to be treated per hour, and in several rows superimposed offset to align the faces of the angles, divide the treated product into thin layers and mix it by turning it (brewing phenomenon), o The central chimney (8) is positioned over the entire width of the cell so as to recover the water vapor, thus preventing moisture enrichment of the material being treated upstream, o Under each angle are arranged heating elements (6) which have as their object drying material, o Under each angle, in the upper part of the central wall, vents (9) are arranged to remove moisture in the central chimney (8), allowing the optimization of desiccation, A complex system control system composed of a programmer (10) and thermal probes to manage the exposure time, and the output flow (flow system 7) by controlling the cell temperatures and output of the treated material. Plan A: Front view (1/5) Plan B: Left view (2/5) Plan C: AA cut of the left view (3/5) Plan D: BB cut of the front view (4 / 5) Plan E: Detail C of the AA section of the heating cell (5/5)
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1200997A FR2989157A1 (en) | 2012-04-04 | 2012-04-04 | Drying oven for accelerated drying of e.g. grains in industrial sector, has resistors placed between corners to ensure instantaneous extraction of moisture, and regulation system automatically subjecting exit temperature to flow |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1200997A FR2989157A1 (en) | 2012-04-04 | 2012-04-04 | Drying oven for accelerated drying of e.g. grains in industrial sector, has resistors placed between corners to ensure instantaneous extraction of moisture, and regulation system automatically subjecting exit temperature to flow |
Publications (1)
Publication Number | Publication Date |
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FR2989157A1 true FR2989157A1 (en) | 2013-10-11 |
Family
ID=46551637
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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FR1200997A Pending FR2989157A1 (en) | 2012-04-04 | 2012-04-04 | Drying oven for accelerated drying of e.g. grains in industrial sector, has resistors placed between corners to ensure instantaneous extraction of moisture, and regulation system automatically subjecting exit temperature to flow |
Country Status (1)
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FR (1) | FR2989157A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3101003A1 (en) * | 2019-09-20 | 2021-03-26 | Matair | Solder flux curing and conservation device intended for the nuclear sector for a flow rate of 60 liters / hour over 72 uninterrupted hours, in order to guarantee uniformity of temperature of the flux treated at all points of the oven |
FR3106994A1 (en) * | 2020-02-11 | 2021-08-13 | Matair | Oven device for solder fluxes in a nuclear environment, suitable for controlling the temperature of the flux at all points of the oven at plus or minus 25 ° C, and using heat exchange technology by air mixing . |
CN114027415A (en) * | 2021-11-24 | 2022-02-11 | 福建华龙生物科技集团有限公司 | Compound feed for laying ducks and production equipment thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH89099A (en) * | 1919-12-12 | 1921-05-02 | Bourdet Andre Paul Edouard | Apparatus for the treatment of powdery materials. |
FR1393578A (en) * | 1964-02-14 | 1965-03-26 | Dryer for grain or the like | |
BE715694A (en) * | 1966-08-08 | 1968-10-16 | ||
DE4019375A1 (en) * | 1989-01-16 | 1991-12-19 | Agrober Mezoegazdasagi Elelm | Indirectly-heated vacuum dryer esp. for agricultural prods. |
US5884416A (en) * | 1996-07-11 | 1999-03-23 | Crown Iron Works Company | Grain dryer module |
-
2012
- 2012-04-04 FR FR1200997A patent/FR2989157A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH89099A (en) * | 1919-12-12 | 1921-05-02 | Bourdet Andre Paul Edouard | Apparatus for the treatment of powdery materials. |
FR1393578A (en) * | 1964-02-14 | 1965-03-26 | Dryer for grain or the like | |
BE715694A (en) * | 1966-08-08 | 1968-10-16 | ||
DE4019375A1 (en) * | 1989-01-16 | 1991-12-19 | Agrober Mezoegazdasagi Elelm | Indirectly-heated vacuum dryer esp. for agricultural prods. |
US5884416A (en) * | 1996-07-11 | 1999-03-23 | Crown Iron Works Company | Grain dryer module |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3101003A1 (en) * | 2019-09-20 | 2021-03-26 | Matair | Solder flux curing and conservation device intended for the nuclear sector for a flow rate of 60 liters / hour over 72 uninterrupted hours, in order to guarantee uniformity of temperature of the flux treated at all points of the oven |
FR3106994A1 (en) * | 2020-02-11 | 2021-08-13 | Matair | Oven device for solder fluxes in a nuclear environment, suitable for controlling the temperature of the flux at all points of the oven at plus or minus 25 ° C, and using heat exchange technology by air mixing . |
CN114027415A (en) * | 2021-11-24 | 2022-02-11 | 福建华龙生物科技集团有限公司 | Compound feed for laying ducks and production equipment thereof |
CN114027415B (en) * | 2021-11-24 | 2024-01-26 | 福建华龙生物科技集团有限公司 | Airtight dryer |
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