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EP0891208B1 - Process and device for atomising liquid extinguishing agents in stationary extinguishing installations - Google Patents

Process and device for atomising liquid extinguishing agents in stationary extinguishing installations Download PDF

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Publication number
EP0891208B1
EP0891208B1 EP97915442A EP97915442A EP0891208B1 EP 0891208 B1 EP0891208 B1 EP 0891208B1 EP 97915442 A EP97915442 A EP 97915442A EP 97915442 A EP97915442 A EP 97915442A EP 0891208 B1 EP0891208 B1 EP 0891208B1
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EP
European Patent Office
Prior art keywords
inert gas
extinguishing
liquid
extinguishing agent
added
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.)
Expired - Lifetime
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EP97915442A
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German (de)
French (fr)
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EP0891208A1 (en
Inventor
Manfred Russwurm
Frederic Aebischer
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.)
MIMX HOLDINGS & Co KG GmbH
MINIMAX HOLDING GmbH
General Electric Switzerland GmbH
Minimax GmbH and Co KG
Original Assignee
ABB Asea Brown Boveri Ltd
Minimax GmbH and Co KG
Preussag AG Minimax
Asea Brown Boveri AB
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Priority to EP97915442A priority Critical patent/EP0891208B1/en
Publication of EP0891208A1 publication Critical patent/EP0891208A1/en
Application granted granted Critical
Publication of EP0891208B1 publication Critical patent/EP0891208B1/en
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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C99/00—Subject matter not provided for in other groups of this subclass
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C99/00—Subject matter not provided for in other groups of this subclass
    • A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
    • A62C99/0072—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using sprayed or atomised water

Definitions

  • the invention relates to a method and an apparatus for mixing liquid inert gas with a liquid extinguishing agent (such as water) and subsequent atomization for fire fighting. This takes place in stationary - and application in mobile fire extinguishing systems.
  • a liquid extinguishing agent such as water
  • WO 95/24274 describes a method and an apparatus for atomizing Liquid extinguishing agent with a feed for extinguishing agent, a dispenser for Gas, a reservoir and an admixing unit are known.
  • the proposed The process works with a plug flow that only emerges at the nozzle outlet takes on a pulsating character.
  • both media point to the Mixing device to the same pressure since the gaseous agent from the Container is used as a blowing agent for the extinguishing agent.
  • the use of liquid inert gas is not described.
  • the object of the invention was, in the case of stationary spray water extinguishing systems for Extinguishing the amount of liquid extinguishing agent usually required in conventional extinguishing systems is used to reduce.
  • inert gas is added to the liquid extinguishing agent in liquid form in front of the nozzle.
  • inert gas here does not refer to the state of matter at the time of addition to the liquid extinguishing agent, but the inert gas is added to the liquid extinguishing agent in liquid form.
  • Liquid inert gas can be added either by adding it to the extinguishing agent at elevated pressure or by adding the extinguishing agent to it at elevated pressure.
  • the liquid extinguishing agent (water) is usually in the network with one Pressure of 8-10 bar performed, regardless of the water supply, such as. B. City water network, tanks, etc.
  • the liquid inert gas is fed into the pipeline network at an increased pressure.
  • suitable admixing devices and devices for controlling the pressure in the line network such as check valve, shut-off valve, control valve for the media
  • Drop sizes and throwing distances can be influenced by different nozzles become. Throwing distances of up to 10 m can be achieved.
  • Liquid CO 2 is preferably added to the liquid extinguishing agent water.
  • Bubble Flow is generated by adding more inert gas than in solution can go.
  • This two-phase bubble flow in the piping system can on the nozzle with simple means an aerosol with the optimal drop size for the Firefighting are generated.
  • the advantage here is that the liquid inert gas is in the liquid extinguishing agent high pressure predominantly dissolves and in this way with the drops generated Cause of the fire, since the dynamic process of degassing takes longer than the transportation time. This leads to an improvement in the extinguishing effect because thereby further splitting the drops in flight to the source of the fire with the Advantage that with the fine water mist generated also hidden fire better can be deleted.
  • the surface area of the liquid extinguishing agent is considerably enlarged by the formation of microdroplets in the area of the fire, in particular by the segregation of liquid extinguishing agent and inert gas.
  • the inert gas e.g. CO 2
  • the excess of energy in the fire area is reduced to such an extent that a high extinguishing effect is achieved which cannot be achieved by using microdroplets alone without the addition of preferably liquid inert gas.
  • the amount of inert gas added is optimized.
  • the optimization can either already take place during the project planning by specifying a maximum amount of CO 2 in relation to the extinguishing object.
  • the amount of liquid inert gas added is regulated depending on the concentration in the extinguishing area during the extinguishing in order not to exceed the maximum MAK value of 10,000 ppm or, as is customary in Inergen extinguishing systems ( ⁇ 4% by volume).
  • the amount of the added liquid inert gas also regulated according to the course of the fire.
  • a device which, in addition to a supply for liquid extinguishing agent and dispensing devices for liquid Extinguishing agent, characterized in that at least one reservoir for liquid Inert gas and at least one mixing unit for mixing liquid Extinguishing agent and liquid inert gas is provided.
  • This special admixing unit is preferably placed horizontally or vertically in front of the nozzles in the pipeline network assembled.
  • At least one detector for determining the Concentration of the inert gas in the extinguishing area with at least one Evaluation device, and this with at least one control device for control the amount of liquid inert gas associated.
  • This detector can be used with the detector to determine the concentration of the Inert gases form a unit in the extinguishing area and in particular as a combined one Measuring device for electromagnetic radiation and according to the principle of Smoke detectors and heat detectors should be designed.
  • the opening angles of the dispensing devices for liquid extinguishing agent are adjustable, the opening angle being determined by the admixed amount of liquid inert gas.
  • the device according to the invention has a check valve (9).
  • the extinguishing water is mixed with the liquid inert gas flowing out of the reservoir (2).
  • Suitable shut-off devices and a control valve (8) are arranged between the reservoir (2) and the admixing unit (3).
  • the control valve is preferably connected to an evaluation device (7) for a detector (6) for the extinguishing nozzles (5) defining the extinguishing area (4).
  • the shut-off devices are e.g. B. opened via a fire alarm system, not shown, and after a delay time, depending on the water supply, the control valve (8) is switched. This circuit can switch the control valve (8) to intermittent or continuous flow in order to clear the way for the liquid inert gas as a pressure increasing and inerting medium.
  • the pressure and temperature in the pipe system can be determined by the ratio of the Inert gas and adjusted by the amount of extinguishing agent dispensed per unit of time become.
  • the gas dissolves during the residence time in the pipe system and due to the increased pressure in the extinguishing liquid. This increases the volume and thus the pressure in the pipe system.
  • the extinguishing agent When the extinguishing agent emerges from the nozzle and on its way to the fire material, it segregates the extinguishing medium into its components with simultaneous aerosol formation liquid extinguishing agent. However, a large proportion of the gas passes without Separation directly into the fire zone.
  • the amount of CO 2 released into the extinguishing area (4) remains below the toxicity limit.
  • the water initially emerges as a jet when it leaves the pipe system and is broken down into the finest drops only on the flight to the source of the fire, which results in larger throwing distances, or it emerges as the finest drops with a short range.

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Nozzles (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

The invention relates to a process and a device in which better atomisation of the liquid extinguishing agent (water) is attained and the spread of the drops is extended by the admixture of preferably liquid inert gas at increased pressure in the pipework using a mixing device.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Vermischung von flüssigem Inertgas mit einem flüssigen Löschmittel (wie z. B. Wasser) und anschließender Verdüsung zur Feuerbekämpfung. Dieses findet in stationären - und in mobilen Feuerlöschanlagen Anwendung.The invention relates to a method and an apparatus for mixing liquid inert gas with a liquid extinguishing agent (such as water) and subsequent atomization for fire fighting. This takes place in stationary - and application in mobile fire extinguishing systems.

Üblicherweise werden Sprinkler-, Schaum-, Sprühwasser- und Gaslöschanlagen verwendet.Sprinkler, foam, water spray and gas extinguishing systems are usually used used.

Diese Löschanlagen haben für besondere Anwendungsfälle auch Nachteile. So kommt z. B. bei Sprinkler- und Sprühwasserlöschanlagen sehr viel Wasser zum Einsatz. Dies kann zu erheblichen Folgeschäden führen. Andererseits sind große Wasservorräte und Maschinenleistungen zu installieren. Schaumlöschanlagen erfordern einen erhöhten technischen Aufwand. Dies führt zu hohen Kosten bei der Installation. Außerdem entstehen hohe Kosten für die Entsorgung.
Bei Gaslöschanlagen, deren Löscheffekt u. a. auf der Absenkung der Sauerstoffkonzentration durch Inertisierung im Löschbereich besteht, ist ein erheblicher Aufwand für die Absicherung, insbesondere bei CO2-Löschanlagen, wegen der Personengefährdung erforderlich. Andere Löschgase, die bisher zum Einsatz kamen, wie z. B. Halon, sind zum Teil aus gesetzlicher Vorschrift nicht mehr einsetzbar. Weitere Löschmittel, wie z. B. Argon, sind relativ teuer.These extinguishing systems also have disadvantages for special applications. So z. B. in sprinkler and water spray systems a lot of water is used. This can lead to considerable consequential damage. On the other hand, large water reserves and machine outputs have to be installed. Foam extinguishing systems require increased technical effort. This leads to high installation costs. In addition, there are high disposal costs.
In gas extinguishing systems, the extinguishing effect of which is, among other things, the lowering of the oxygen concentration by inerting in the extinguishing area, a considerable effort for the protection, in particular in the case of CO 2 extinguishing systems, is necessary because of the danger to persons. Other extinguishing gases that have been used so far, such as B. Halon, can no longer be used due to legal requirements. Other extinguishing agents, such as B. argon, are relatively expensive.

Aus WO 95/24274 ist ein Verfahren und eine Vorrichtung zum Verdüsen von Flüssiglöschmittel mit einer Zuführung für Löschmittel, einer Abgabeeinrichtung für Gas, einem Reservoir und einer Zumischeinheit bekannt. Das vorgeschlagene Verfahren arbeitet mit einer Pfropfenströmung, die erst am Düsenaustritt pulsierenden Charakter annimmt. Weiterhin weisen beide Medien an der Zumischeinrichtung den gleichen Druck auf, da das gasförmige Mittel aus dem Behälter als Treibmittel für das Löschmittel benutzt wird. Die Verwendung von flüssigem Inertgas ist nicht beschrieben.WO 95/24274 describes a method and an apparatus for atomizing Liquid extinguishing agent with a feed for extinguishing agent, a dispenser for Gas, a reservoir and an admixing unit are known. The proposed The process works with a plug flow that only emerges at the nozzle outlet takes on a pulsating character. Furthermore, both media point to the Mixing device to the same pressure, since the gaseous agent from the Container is used as a blowing agent for the extinguishing agent. The use of liquid inert gas is not described.

Aufgabe der Erfindung war es, bei stationären Sprühwasserlöschanlagen die für die Brandlöschung notwendige Menge an flüssigem Löschmittel, wie sie üblicherweise in herkömmlichen Löschanlagen eingesetzt wird, zu verringern.The object of the invention was, in the case of stationary spray water extinguishing systems for Extinguishing the amount of liquid extinguishing agent usually required in conventional extinguishing systems is used to reduce.

Diese Aufgabe wird dadurch gelöst, daß dem flüssigen Löschmittel Inertgas in flüssiger Form vor der Düse zugegeben wird. Die Bezeichnung Inertgas bezieht sich hier nicht auf den Aggregatzustand zum Zeitpunkt der Zugabe zu dem flüssigen Löschmittel, sondern das Inertgas wird flüssig dem flüssigen Löschmittel zugegeben.
Die Zugabe von flüssigem Inertgas kann erfolgen, indem entweder dieses mit erhöhtem Druck dem Löschmittel oder das Löschmittel diesem mit erhöhtem Druck zugemischt wird.This object is achieved in that inert gas is added to the liquid extinguishing agent in liquid form in front of the nozzle. The term inert gas here does not refer to the state of matter at the time of addition to the liquid extinguishing agent, but the inert gas is added to the liquid extinguishing agent in liquid form.
Liquid inert gas can be added either by adding it to the extinguishing agent at elevated pressure or by adding the extinguishing agent to it at elevated pressure.

Das flüssige Löschmittel (Wasser) wird üblicherweise im Leitungsnetz mit einem Druck von 8-10 bar geführt, unabhängig der Wasserbevorratung, wie z. B. Stadtwassernetz, Behälter usw.The liquid extinguishing agent (water) is usually in the network with one Pressure of 8-10 bar performed, regardless of the water supply, such as. B. City water network, tanks, etc.

Demgegenüber wird das flüssige Inertgas mit einem erhöhten Druck in das Leitungsnetz eingespeist. Dies führt in Verbindung mit geeigneten Zumischeinrichtungen und Einrichtungen zur Steuerung des Drucks im Leitungsnetz, wie z.B. Rückschlagventil, Absperrventil, Regelventil für die Medien, zu einer Druckerhöhung an Einrichtungen zur Abgabe des flüssigen Löschmittels, z. B. Löschdüsen.
Hierdurch werden an den Löschdüsen nicht nur die Wasseraustrittsgeschwindigkeiten, sondern auch die Tropfenverteilung und die Wurfweite erhöht. In contrast, the liquid inert gas is fed into the pipeline network at an increased pressure. In connection with suitable admixing devices and devices for controlling the pressure in the line network, such as check valve, shut-off valve, control valve for the media, this leads to an increase in pressure in devices for dispensing the liquid extinguishing agent, e.g. B. extinguishing nozzles.
This increases not only the water outlet speeds at the extinguishing nozzles, but also the drop distribution and the throwing distance.

Durch unterschiedliche Düsen können Tropfengrößen und Wurfweiten beeinflußt werden. Insbesondere können Wurfweiten von bis zu 10 m erreicht werden.Drop sizes and throwing distances can be influenced by different nozzles become. Throwing distances of up to 10 m can be achieved.

Bevorzugt wird flüssiges CO2 zum flüssigen Löschmittel Wasser zugegeben.Liquid CO 2 is preferably added to the liquid extinguishing agent water.

Hierbei ist zu beachten, daß durch das Verfahren eine Zweiphasen-Blasenströmung, Bubble Flow, erzeugt wird, indem mehr Inertgas zugegeben wird, als in Lösung gehen kann. Durch diese Zweiphasen-Blasenströmung im Rohrleitungssystem kann an der Düse mit einfachen Mitteln ein Aerosol mit optimaler Tropfengröße für die Brandbekämpfung erzeugt werden.It should be noted here that the process results in a two-phase bubble flow, Bubble Flow, is generated by adding more inert gas than in solution can go. This two-phase bubble flow in the piping system can on the nozzle with simple means an aerosol with the optimal drop size for the Firefighting are generated.

Der Vorteil hierbei ist, daß sich das flüssige Inertgas im flüssigen Löschmittel unter hohem Druck überwiegend löst und auf diese Weise mit den erzeugten Tropfen zum Brandherd geführt wird, da der dynamische Vorgang der Entgasung länger dauert als die Transportzeit. Dies führt zu einer Verbesserung der Löschwirkung, weil dadurch im Fluge zum Brandherd die Tropfen weiter aufgespalten werden, mit dem Vorteil, daß mit dem erzeugten Feinstwassernebel ebenfalls verdeckte Feuer besser gelöscht werden können.The advantage here is that the liquid inert gas is in the liquid extinguishing agent high pressure predominantly dissolves and in this way with the drops generated Cause of the fire, since the dynamic process of degassing takes longer than the transportation time. This leads to an improvement in the extinguishing effect because thereby further splitting the drops in flight to the source of the fire with the Advantage that with the fine water mist generated also hidden fire better can be deleted.

Obwohl die physikalisch-chemischen Vorgänge noch nicht vollständig abgeklärt sind, läßt sich feststellen, daß durch das erfindungsgemäße Verfahren die Flamme durch die kinetische Energie des flüssigen Löschmittels und durch die Entgasung des Inertgases am Ort des Brandherdes vom brennbaren Gas getrennt wird.Although the physico-chemical processes have not yet been fully clarified, can be found that the flame through by the inventive method the kinetic energy of the liquid extinguishing agent and by degassing the Inert gas is separated from the combustible gas at the location of the fire.

Durch die Bildung von Mikrotropfen im Bereich des Brandherdes, insbesondere durch die Entmischung von flüssigem Löschmittel und Inertgas, wird die Oberfläche des flüssigen Löschmittels erheblich vergrößert. Das Inertgas (z. B. CO2) absorbiert zusätzlich Strahlungsenergie, und die Verdampfung des flüssigen Löschmittels entzieht dem Brand Energie. Dadurch wird der Energieüberschuß im Brandbereich soweit reduziert, daß ein hoher Löscheffekt erreicht wird, der allein bei der Verwendung von Mikrotropfen ohne Beimischung von vorzugsweise flüssigem Inertgas nicht zu erzielen ist.The surface area of the liquid extinguishing agent is considerably enlarged by the formation of microdroplets in the area of the fire, in particular by the segregation of liquid extinguishing agent and inert gas. The inert gas (e.g. CO 2 ) also absorbs radiation energy, and the evaporation of the liquid extinguishing agent removes energy from the fire. As a result, the excess of energy in the fire area is reduced to such an extent that a high extinguishing effect is achieved which cannot be achieved by using microdroplets alone without the addition of preferably liquid inert gas.

Die Menge des zugegebenen Inertgases wird optimiert. Bei Verwendung von vorzugsweise CO2 kann die Optimierung entweder bereits bei der Projektierung erfolgen, indem eine Höchstmenge an CO2 in bezug auf das Löschobjekt festgelegt wird.The amount of inert gas added is optimized. When using preferably CO 2 , the optimization can either already take place during the project planning by specifying a maximum amount of CO 2 in relation to the extinguishing object.

Bevorzugt ist aber, daß die Menge des zugegebenen, flüssigen Inertgases, wie z. B. CO2, in Abhängigkeit von der Konzentration im Löschbereich während der Löschung geregelt wird, um dem maximalen MAK-Wert von 10 000 ppm bzw. wie bei Inergen-Löschanlagen üblich (< 4 Vol.%), nicht zu überschreiten.However, it is preferred that the amount of liquid inert gas added, such as. B. CO 2 , is regulated depending on the concentration in the extinguishing area during the extinguishing in order not to exceed the maximum MAK value of 10,000 ppm or, as is customary in Inergen extinguishing systems (<4% by volume).

Nach einem weiter bevorzugten Verfahren wird die Menge des zugegebenen flüssigen Inertgases zusätzlich nach dem Brandverlauf geregelt.According to a further preferred method, the amount of the added liquid inert gas also regulated according to the course of the fire.

Die Aufgabe wird ferner gelöst durch eine erfindungsgemäße Vorrichtung, die, neben einer Zufuhr für flüssiges Löschmittel und Abgabeeinrichtungen für flüssiges Löschmittel, dadurch gekennzeichnet ist, daß wenigstens ein Reservoir für flüssiges Inertgas und wenigstens eine Zumischeinheit für das Mischen von flüssigem Löschmittel und flüssigem Inertgas vorgesehen ist. Diese spezielle Zumischeinheit wird vorzugsweise horizontal oder vertikal vor den Düsen ins Rohrleitungsnetz montiert.The object is further achieved by a device according to the invention which, in addition to a supply for liquid extinguishing agent and dispensing devices for liquid Extinguishing agent, characterized in that at least one reservoir for liquid Inert gas and at least one mixing unit for mixing liquid Extinguishing agent and liquid inert gas is provided. This special admixing unit is preferably placed horizontally or vertically in front of the nozzles in the pipeline network assembled.

Bevorzugt ist an der Vorrichtung wenigstens ein Detektor zur Bestimmung der Konzentration des Inertgases im Löschbereich mit wenigstens einer Auswerteeinrichtung, und diese mit wenigstens einer Regeleinrichtung zur Regelung der Menge des flüssigen Inertgases verbunden. At least one detector for determining the Concentration of the inert gas in the extinguishing area with at least one Evaluation device, and this with at least one control device for control the amount of liquid inert gas associated.

Weiter bevorzugt ist eine Vorrichtung, bei der ein Detektor zur Bestimmung des Brandverlaufs angeordnet ist.Also preferred is a device in which a detector for determining the Fire course is arranged.

Dieser Detektor kann mit dem Detektor zur Bestimmung der Konzentration des Inertgases im Löschbereich eine Einheit bilden und insbesondere als kombinierte Meßeinrichtung für elektro-magnetische Strahlung sowie nach dem Prinzip der Rauchmelder und Wärmemelder ausgebildet sein.This detector can be used with the detector to determine the concentration of the Inert gases form a unit in the extinguishing area and in particular as a combined one Measuring device for electromagnetic radiation and according to the principle of Smoke detectors and heat detectors should be designed.

Nach einer weiter bevorzugten Gestaltung der Vorrichtung sind die Öffnungswinkel der Abgabeeinrichtungen für flüssiges Löschmittel einstellbar, wobei der Öffnungswinkel von der zugemischten flüssigen Inertgasmenge bestimmt ist.
Anhand einer schematischen Darstellung eines Ausführungsbeispiels werden das erfindungsgemäße Verfahren und die Vorrichtung näher erläutert.According to a further preferred embodiment of the device, the opening angles of the dispensing devices for liquid extinguishing agent are adjustable, the opening angle being determined by the admixed amount of liquid inert gas.
The method and the device according to the invention are explained in more detail on the basis of a schematic illustration of an exemplary embodiment.

Die erfindungsgemäße Vorrichtung weist neben den üblichen Leitungen und geeigneten Absperreinrichtungen am Löschwassereintritt ein Rückschlagventil (9) auf. In der Zumischeinheit (3) wird das Löschwasser mit dem aus dem Reservoir (2) ausströmenden flüssigen Inertgas vermischt. Zwischen Reservoir (2) und Zumischeinheit (3) sind geeignete Absperreinrichtungen und ein Steuerventil (8) angeordnet.
Das Steuerventil ist bevorzugt mit einer Auswerteeinrichtung (7) für einen Detektor (6) für die den Löschbereich (4) definierenden Löschdüsen (5) verbunden.
Die Absperreinrichtungen werden z. B. über eine nicht dargestellte Brandmeldeanlage geöffnet und nach einer Verzögerungszeit, in Abhängigkeit von der Wasserzuführung, wird das Regelventil (8) geschaltet.
Diese Schaltung kann das Regelventil (8) auf intermittierenden oder auf kontinuierlichen Durchfluß schalten, um den Weg für das flüssige Inertgas als Druckerhöhungs- und Inertisierungsmedium freizugeben. In addition to the usual lines and suitable shut-off devices at the fire water inlet, the device according to the invention has a check valve (9). In the admixing unit (3), the extinguishing water is mixed with the liquid inert gas flowing out of the reservoir (2). Suitable shut-off devices and a control valve (8) are arranged between the reservoir (2) and the admixing unit (3).
The control valve is preferably connected to an evaluation device (7) for a detector (6) for the extinguishing nozzles (5) defining the extinguishing area (4).
The shut-off devices are e.g. B. opened via a fire alarm system, not shown, and after a delay time, depending on the water supply, the control valve (8) is switched.
This circuit can switch the control valve (8) to intermittent or continuous flow in order to clear the way for the liquid inert gas as a pressure increasing and inerting medium.

Der Druck und die Temperatur in dem Rohrsystem kann durch das Verhältnis des Inertgases und durch die pro Zeiteinheit abgegebene Löschmittelmenge eingestellt werden.The pressure and temperature in the pipe system can be determined by the ratio of the Inert gas and adjusted by the amount of extinguishing agent dispensed per unit of time become.

Das Gas geht nach der Zumischung während der Verweildauer im Rohrsystem und aufgrund des erhöhten Druckes in der Löschflüssigkeit in Lösung.
Im Rohrsystem erfolgt damit eine Volumen- und somit auch Druckerhöhung.After the admixture, the gas dissolves during the residence time in the pipe system and due to the increased pressure in the extinguishing liquid.
This increases the volume and thus the pressure in the pipe system.

Je größer der Druck und je tiefer die Temperatur des Löschmediums ist, desto mehr flüssiges Inertgas kann in Lösung gebracht werden.The greater the pressure and the lower the temperature of the extinguishing medium, the more liquid inert gas can be brought into solution.

Da die Masse der Zweiphasen-Blasenströmung gegenüber Wasser kleiner ist, verringert sich der Fließwiderstand im Rohrnetz mit dem Vorteil, daß kleinere Querschnitte gewählt werden können.Since the mass of the two-phase bubble flow is smaller compared to water, the flow resistance in the pipe network is reduced with the advantage that smaller ones Cross sections can be selected.

Bei Austritt des Löschmittels aus der Düse und dem Weg zum Brandgut entmischt sich das Löschmedium in seine Komponenten bei gleichzeitiger Aerosolbildung des flüssigen Löschmittels. Ein großer Anteil des Gases gelangt jedoch ohne Entmischung direkt in die Brandzone.When the extinguishing agent emerges from the nozzle and on its way to the fire material, it segregates the extinguishing medium into its components with simultaneous aerosol formation liquid extinguishing agent. However, a large proportion of the gas passes without Separation directly into the fire zone.

Bei optimaler Projektierung oder in Verbindung mit dem Detektor (6) und Auswerteeinrichtung (7) bleibt die in den Löschbereich (4) abgegebene CO2-Menge unterhalb der Toxizitätsgrenze.
Das Wasser tritt, je nach eingesetzter Düse, beim Verlassen des Rohrsystems vorerst als Strahl aus und zerkleinert sich in feinste Tropfen erst auf dem Flug zum Brandherd, wodurch größere Wurfweiten erzielt werden, bzw. es tritt als feinste Tropfen mit geringer Reichweite aus.With optimal project planning or in conjunction with the detector (6) and evaluation device (7), the amount of CO 2 released into the extinguishing area (4) remains below the toxicity limit.
Depending on the nozzle used, the water initially emerges as a jet when it leaves the pipe system and is broken down into the finest drops only on the flight to the source of the fire, which results in larger throwing distances, or it emerges as the finest drops with a short range.

Claims (13)

  1. Method of atomising liquid extinguishing agent in extinguishing systems, characterised in that inert gas is added to the extinguishing agent in liquid form for producing a two-phase bubble flow upstream of the nozzle, the inert gas being introduced at a pressure higher than the extinguishing agent.
  2. Method according to claim 1, characterised in that CO2 is added to the extinguishing agent as the inert gas.
  3. Method according to claim 1 or 2, characterised in that the inert gases are added intermittently.
  4. Method according to claims 1 to 3, characterised in that the added quantity of inert gas is greater than that which dissolves with the liquid extinguishing agent.
  5. Method according to one of claims 1 to 4, characterised in that the agents, flowing in the pipeline, are atomised at the outlet of the pipeline in such a manner that they form an aerosol, a mist of water.
  6. Method according to one of claims 1 to 5, characterised in that the quantity of added liquid inert gas is regulated in dependence on the concentration of inert gas in the extinguishing area.
  7. Method according to one of claims 1 to 5, characterised in that the quantity of added liquid inert gas is regulated according to the development of the fire.
  8. Method according to one of claims 1 to 7, characterised in that the atomisation is effected by means of extinguishing nozzles having an adjustable aperture angle, and the aperture angle is regulated in dependence on the seat of the fire and the development of the fire, more especially by means of the pressure at the extinguishing nozzles.
  9. Apparatus for atomising extinguishing agent in extinguishing systems, having a feeding means (1) for supplying liquid extinguishing agent and a delivery means (5) for discharging the extinguishing agent, characterised in that at least one admixing unit (3), disposed upstream of the delivery means (5), is provided for liquid inert gas, and-at least one reservoir (2) is provided for liquid inert gas.
  10. Apparatus according to claim 9, characterised in that a container is provided as the admixing unit, and the liquid inert gas is continuously added to the traversing extinguishing agent in said container.
  11. Apparatus according to one of claims 9 or 10, characterised in that at least one detector (6) for determining the concentration of the inert gas in the extinguishing area (4) is connected to at least one evaluating means (7), and the latter is connected to at least one regulating means (8) for regulating the quantity of inert gas.
  12. Apparatus according to one of claims 9 to 11, characterised in that at least one detector is provided for determining the development of the fire and for controlling the extinguishing operation.
  13. Apparatus according to one of claims 9 to 12, characterised in that the distribution means (5) for discharging liquid extinguishing agent have adjustable aperture angles, and the aperture angle can be set in dependence on the admixed quantity of liquid inert gas.
EP97915442A 1996-03-30 1997-03-26 Process and device for atomising liquid extinguishing agents in stationary extinguishing installations Expired - Lifetime EP0891208B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97915442A EP0891208B1 (en) 1996-03-30 1997-03-26 Process and device for atomising liquid extinguishing agents in stationary extinguishing installations

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
EP96105159 1996-03-30
EP96105159 1996-03-30
EP96114586 1996-09-12
EP96114586A EP0798019A1 (en) 1996-03-30 1996-09-12 Method and device for the atomisation of a liquid fire extinguishing agent in a stationary fire extinguishing plant
PCT/EP1997/001550 WO1997036651A1 (en) 1996-03-30 1997-03-26 Process and device for atomising liquid extinguishing agents in stationary extinguishing installations
EP97915442A EP0891208B1 (en) 1996-03-30 1997-03-26 Process and device for atomising liquid extinguishing agents in stationary extinguishing installations

Publications (2)

Publication Number Publication Date
EP0891208A1 EP0891208A1 (en) 1999-01-20
EP0891208B1 true EP0891208B1 (en) 2000-10-18

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Application Number Title Priority Date Filing Date
EP96114586A Withdrawn EP0798019A1 (en) 1996-03-30 1996-09-12 Method and device for the atomisation of a liquid fire extinguishing agent in a stationary fire extinguishing plant
EP97915442A Expired - Lifetime EP0891208B1 (en) 1996-03-30 1997-03-26 Process and device for atomising liquid extinguishing agents in stationary extinguishing installations

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EP96114586A Withdrawn EP0798019A1 (en) 1996-03-30 1996-09-12 Method and device for the atomisation of a liquid fire extinguishing agent in a stationary fire extinguishing plant

Country Status (12)

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US (1) US6173790B1 (en)
EP (2) EP0798019A1 (en)
JP (1) JP4031832B2 (en)
KR (1) KR20000005148A (en)
CN (1) CN1092071C (en)
AT (1) ATE196996T1 (en)
AU (1) AU722952B2 (en)
DE (1) DE59702499D1 (en)
ES (1) ES2153188T3 (en)
NZ (1) NZ332157A (en)
PT (1) PT891208E (en)
WO (1) WO1997036651A1 (en)

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Also Published As

Publication number Publication date
EP0798019A1 (en) 1997-10-01
AU2291997A (en) 1997-10-22
CN1092071C (en) 2002-10-09
DE59702499D1 (en) 2000-11-23
EP0891208A1 (en) 1999-01-20
NZ332157A (en) 2000-08-25
CN1218416A (en) 1999-06-02
WO1997036651A1 (en) 1997-10-09
JP2001501839A (en) 2001-02-13
AU722952B2 (en) 2000-08-17
PT891208E (en) 2001-03-30
ATE196996T1 (en) 2000-11-15
KR20000005148A (en) 2000-01-25
US6173790B1 (en) 2001-01-16
JP4031832B2 (en) 2008-01-09
ES2153188T3 (en) 2001-02-16

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