FI112440B - System for extinguishing fires in confined spaces e.g. engine rooms of ships - Google Patents

Abstract

The system comprises general nozzles disposed above and/or on the sides of the space to be protected for bringing about general fire extinguishment in the space, and/or spot nozzles disposed around objects in the space to be protected which are susceptible to fire, such as engines, feed pipe systems for fuel or open oil tanks for extinguishing fires in them. At least a portion of the nozzles consists of low-pressure nozzles, from which extinguishing water is sprayed at a pressure 12 bar, and preferably at a pressure of 2-12 bar, as water sprays which consist of drops of various sizes which are distributed in the water spray so that the frequency of the drops having larger diameters is greater at the periphery of the water spray than in the inner part of it, and correspondingly the frequency of the drops having smaller diameters is greater in the inner part of the water spray than at its periphery.

Description

112440

SYSTEM, METHOD AND Nozzle for FIRE EXTINCTION SYSTEM, FÖRFARANDE OCH MUNSTYCKE VID SLÄCKNING AV BRAND

The present invention relates to a method and an extinguishing system for extinguishing a fire in confined spaces such as ship's engine rooms, switchboards, hotel rooms or open oil tanks.

The extinguishing system of the invention includes general nozzles arranged above and / or on the protected space to provide general extinguishing in the space, and / or on the nozzles arranged in the nozzles around fire sensitive objects in the protected space, such as machinery, fuel feed lines or open oil tanks. The fire extinguishing system thus corresponds to the so-called. sprinkler system. The invention also relates to a fog spray nozzle suitable for use in a fire extinguishing system.

Conventional sprinkler fire extinguishing plants using water as the extinguishing agent include a water pipe system 20 mounted on the ceiling of the room and possibly on the walls. In the event of a fire, the nozzles fitted to the piping will trip and pressurized water will flow from the nozzles to the room. To ensure quenching, the amount of water coming from the nozzles is usually dimensioned several times the need. That is why, in smaller fires, water-hinges are often larger than burns. Water from sprinkler plants usually * * · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · vaporize. In addition, a large amount of water must be used to extinguish the 30 fire extinguishing foci 112440 2. Water extinguishing is, of course, particularly problematic in spaces containing electrical equipment.

It has been found that the smaller the droplet size of the extinguishing water, the greater the heat absorption capacity of the droplets, i.e. the better the cooling effect of the water. It is also known that small water droplets have better penetration into combustible material, e.g. textiles, than large droplets. Therefore, efforts have been made to extinguish the fire of the earth with spray jets having a droplet size somewhere between 0.1 and 1 mm in diameter. The small I droplets are produced by the nozzles by varying the pressure. In the case of really high pressure mist jets, even the smaller droplet sizes mentioned above are used.

15

However, the small droplet size has the disadvantage that at low pressure, <10 bar, these small mist droplets do not readily penetrate the firebox.

If a small drop of water mist is applied directly to the firebox at low pressure, the flue gases, fires, and water vapor generated will tend to push the mist further away from the fireplace, leaving a small cooling and extinguishing effect. For conventional reasons, the conventional low-drop low-pressure * 25 mist jet has so far failed to achieve sufficient jet length. Thus, when extinguishing with a low pressure mist jet, a multiple amount of water must be used and the extinguishing time is significantly longer than with a larger 30 droplet size. Despite the advantages of a small droplet size, '' 'could not be utilized as desired.

A solution to this problem has been sought to raise the pressure of the 112440 3-bar spray jet to a high level, for example in the case of international patent application WO 92/22353, up to a pressure of more than 200 bar. However, the fine mist sprayed with too much pressure passes too fast 5 through the fires so that even the cooling effect cannot be fully utilized.

High-pressure jets are therefore mainly aimed at suppressing fire with high-pressure water mattresses and with great force. Excess water evaporates, spreads to the sides and fills the fire compartment with water mist ("steam"), which is difficult for the firefighter. Of course, the high-pressure jet extinguishant also has the disadvantage that, when exposed to an open liquid container, such as an oil tank, it releases this liquid into the environment and thus increases the risk of fire.

Of course, the price of pressurized systems is increased by the 20 expensive high-pressure accumulators and other pressurization equipment they require.

Other extinguishing systems, such as CO 2 and halon extinguishing systems, which are effective in extinguishing a fire and avoiding water damage, are in place of water extinguishing. However, a toxic CO2 gas fire extinguishing system with fire suppression with CO 2 gas can only be used in areas where there are no humans or 30 animals at the time of extinguishing. Halon, on the other hand, is not dangerous to humans in itself, and even with very small amounts of halon, the fire can be extinguished. At high temperatures:: halons, however, form highly toxic compounds 112440 4 and can therefore be dangerous in the event of fire. In addition, halons have been found to be harmful to the atmosphere.

It is an object of the present invention to provide a new extinguishing method, an extinguishing system corresponding to a sprinkler system, and a spray jet in which the above-mentioned drawbacks are minimized.

It is an object of the invention to provide, in particular, a new extinguishing system which effectively and quickly extinguishes a fire with water jets without using excessive amounts of water.

It is a further object of the invention to provide a new simple and inexpensive start-up system.

To achieve the above purposes, the method, extinguishing system and nozzle of the present invention are characterized by what is stated in the following claims;

The extinguishing system according to the invention comprises at least 25 portions of low pressure nozzles for spraying extinguishing water at low pressure, preferably below 10 bar nozzle pressure, most preferably 2-12 bar. The extinguishing water is sprayed as a mist jet,,, · consisting essentially of droplets of different sizes.

! The diameter of the droplets varies mainly from 0.1 to 1 mm, preferably from 0.2 to 0.5 mm.

In the system of the invention, the mist jet is fed from the nozzle, preferably by means of flaps fitted therein, so that the jet is discharged at least partially as a rotating conical jet or as the jet proceeds in a screw-like manner around its main path of motion.

Thus, the droplets of different sizes are distributed such that a larger layer of large water droplets is formed on the conical outer surface of the water jet than the water jet 10 in its central phases. Correspondingly, a denser layer of tiny water droplets is formed in the interior of the water jet, in the center of the main flow direction, than on the conical outer surface. Thus, the droplets are distributed in the water jet such that the diameter of the larger diameter droplets is higher on the outside of the water jet than on its inner part, and correspondingly the smaller diameter droplets have a higher frequency on the inner part of the water jet.

The low pressure nozzles are preferably arranged to spray extinguishing water in the form of droplets having a diameter of 0.1 to 1 mm, preferably 0.1 to 0.5 mm.

The average droplet diameter increases by at least 20%, preferably more than 50%, from the inside of the jet to the outside. In the system according to the invention, the s;

A preferred droplet size distribution is achieved by spraying the extinguishing water with low pressure nozzles having guide vanes for directing the jet out of the nozzle, mainly in the form of a mist jet rotating about its own flow direction 112440 6. This causes larger droplets in the shower to collect on the surface of the shower and small droplets in the center of the shower. The rotational movement time of the droplets at the edge of the jet is relatively large, so that the jet does not strike directly with the fire at intense force. Large droplets accumulate in the periphery and encounter upcoming upward flowing gases. Small droplets remain protected inside the shower and do not move out of the shower.

10

In the extinguishing system of the invention, the water jet emerges at high speed out of the nozzle and drops immediately, but slows down due to the rotational movement of the droplets as the droplets move downward, away from the nozzle. In the system according to the invention, the jet then passes slower than the corresponding jet in the high pressure systems, whereby the jet is better able to perform the extinguishing work. The system of the invention has sought to vaporize as much of the water as possible, whereby the water is best used and utilized; hinges are minimized.

The low pressure nozzle according to the invention thus comprises a nozzle body having an extinguishing water inlet, a nozzle housing, and a discharge or spray outlet for the extinguishing water. At least one guide flap is arranged inside the nozzle housing to guide the extinguishing water about its axis. rotationally moving 30 movement path, whereby larger fire extinguishing water droplets tend to accumulate as a cone extinguishing water jet (i: to the outer periphery and smaller extinguishing water droplets to the interior of the extinguishing water jet) from the nozzle.

The extinguishing system according to the invention is based on a rapid drop in the temperature of the flue gases and prevention of re-ignition. The small mist droplets are transported by the large droplets around them as a highly penetrating jet directly to the fire site. Large droplets, due to their size, normally penetrate better than small droplets through a flue gas mattress.

In the system of the invention, large droplets carry, by their weight, small droplets through the flue gas mattress.

In the system of the invention, 0.5 to 1.5% of a fire retardant active agent such as monoammonium phosphate, ammonia and / or urea is preferably added to the extinguishing water. A fire retardant, such as ammonium sulfate, forms a film on the fire target that prevents the pyrolysis gases generated in the fire target from combining with oxygen in the air and thus re-igniting the fire. In an apartment fire, the additive forms, for example, a film around the fibers of the interior textiles, preventing them from re-igniting at hot temperatures. The film-forming additive particularly contributes to extinguishing a liquid fire by forming a film over the liquid surface ;; which prevents oxygen from combining with the liquid. Other additives, such as ammonia, may be added to the extinguishing water to increase its cooling effect.

30 Additives bind heat as it evaporates. Ammonia additionally raises the pH of the extinguishing fluid to> 7, thereby reducing the corrosion effect of the water. No additives mentioned! /> mixed with water to give a dilute solution give 8 Ί λ η, «> 5 ο

! I /. 4 · 4 U

harm human beings or the environment.

The power plant's extinguishing system uses as extinguishing water salt water, such as distilled water, to which preferably 0.5 to 1.5% of a fire retardant active agent is added. The electrical resistance of distilled water is more than 100 k ohms / cm.

The extinguishing water jet is preferably supplied from the general or target nozzles so that the water jet does not yet form a foam in or near them. A thin layer of foam is allowed to form only after the extinguishing water reaches the burning object.

The nozzles of the extinguishing system according to the invention are fixed and preferably such that the extinguishing water jets from them completely cover the desired parts of the fire-sensitive objects. Further, at least a portion of the low pressure nozzles are arranged such that the jet from the nozzles in the event of a fire is directed to the vacuum side of the resulting firebox, whereupon the extinguishing water is absorbed from this jet into the firebox r.

In the system of the invention, both general and target nozzles preferably spray the extinguishing fluid at a pressure of less than 10 bar, preferably 2 to 12 bar. 3-18 rpm of extinguishing fluid is supplied from the general nozzles. The target nozzles are positioned at a distance of, for example, 0.5 to 1.5 m from the flammable target, so that the extinguishing liquid can penetrate to the desired target in the firebox but not sink too quickly directly through the firebox 112440 9 without effectively extinguishing the fire. The extinguishing fluid is fed from the target nozzles at 4-16 rpm.

Preferably, the target nozzles spray water droplets of a diameter of 0.18 to 0.5 mm, which effectively binds heat and are able to penetrate through the firebox into the target or, when fed to the vacuum side, are absorbed into the firebox.

10 The fire extinguishing system shall be designed so that the target nozzles are used to cover particularly flammable objects, that is to say, those parts of the room where the fire is likely to be ignited. In the ship's engine room, for example, engine fuel pipelines, which can be up to 150 bar 15 pressures, are such an object where leakage can cause a spray fire, a jet of fire that needs to be quickly extinguished.

In the engine room, the target nozzles 20 of the extinguishing system are most preferably arranged to be completely. covers the high-pressure, low-pressure fuel supply pipelines connected to the machine. Further, it is preferred to ensure that at least one target nozzle is ignited in the event of fire. supplies the extinguishing liquid to the vacuum side of the flame.

25 The direction of the flame is generally difficult to predict in advance, and therefore target nozzles must be fitted around the fire-sensitive object so that all possibilities are taken into account, ie target nozzles:: cover a slightly larger area of the fire-sensitive object; In the case of a fuel pipeline, the target nozzles are fitted at appropriate intervals along the pipe and furthermore ;;; one more nozzle outside each end of the tube; · '

112440 10

The nozzles of the extinguishing system are preferably nozzles which spray the extinguishing fluid at a wide angle, about 40 ° to 125 °, depending on the nozzle. The lower the pressure the water or ve-5 si / additive solution is fed from the nozzle, the greater the angle should be. For example, at a pressure of 6 bar, the extinguishing fluid can be supplied at an angle of 100 ° to 105 ° and at a pressure of 2 bar at an angle of about 115 ° to 120 °.

The extinguishing system according to the invention can be implemented e.g. as a dry system, that is, the water in the extinguishing water pipeline normally does not contain water but air. In the event of a fire, the extinguishing system is triggered either by an automatic release or by pressing the trigger switch, the pump or pumps in connection with the extinguishing fluid reservoir, if there are several, and supplying extinguishing fluid to the piping. It may often be advantageous to use a different pump for the general piping and the tubing 20 for the target nozzles. In this case, one large and expensive pump Y; instead of two small pumps, which are considerably cheaper in total. In addition, nozzles and target nozzles used for general extinguishing may be used. thiamine pressure adjusts independently of each other.

25

Advantages of the extinguishing system according to the invention over the CO2-* '* sprinkler plant include:

- can be launched safely on a person; Y 30 - can be switched on automatically because no danger to human being; The Y system uses low pressures (<12 bar) without the need for expensive pumps or pressure piping; 112440 11 - the extinguishing agent is cheap; - Safe and inexpensive test launch; - easy and inexpensive maintenance; - the system does not require pressure vessels.

5

The system of the invention can also replace Halon extinguishing systems which are being disposed of due to their environmental hazards.

Advantages of the invention over other known water extinguishing systems include: a low pressure system in which large droplets are used to convey light small droplets to, but not directly through, a fire target; 15 - good penetration of small spray droplets into the spray flame; - good extinguishing effect; - low pressure system, cheaper and easier to install than known high pressure systems; 20 - optimally combined combustion cooling with V: water and re-ignition with additive; - small amounts of extinguishing water because the nozzles are aligned so that the water jets are used optimally. for. Conventional sprinkler systems 25 use about 5 liters / m2 of extinguishing water per protected surface. In the system of the invention, amounts of water of about 0.3 to 6 liters / m 2 are achieved, depending on the nozzle, in some cases up to 1/10 of the amount of water normally used; : 30 - water damage significantly less than conventional sprinkler systems; - the after-damage is also small, since the extinguishing liquid Ί 'has a pH of almost 7 and a low corrosion effect; 112440 12 - no water recirculation in the pipeline is required, and - low drop salt water at low pressure does not destroy electrical equipment.

The fire extinguishing system according to the invention operates, for example, as follows: In the event of a fire, the start switch of the extinguishing plant is pressed, whereupon the pump or pumps are started and draws extinguishing water from the tank.

The container 10 is pre-added and mixed with fire 10 anti-ignition additives. The additive is emulsified in water. If desired, the additive may be added to the flowing extinguishing water with the ejector only after the pump has started. The extinguishing water is pumped from the general nozzles and the target nozzles to a protected target.

The extinguishing water (extinguisher) from the general nozzles cools the room and extinguishes the flames there. From the target nozzles, the water is directed to the firebox and to the base of the firebox, preferably via the vacuum side of the flame, whereby the water effectively breaks the flame.

, ···. The extinguishing water from the general nozzles, which is sprayed in small and large droplets of varying size and without high pressure, is also absorbed in the combustion chamber with the combustion air 25, however, also extinguishing the flames and cooling the fire foci. Thus, the system of the invention does not require as many target nozzles as conventional extinguishing systems. The additive forms a film on hot surfaces, preventing the pyrolysis: oxygen gas and air oxygen to combine and re-flame.

The invention will now be further described with reference to the accompanying drawings in which:

Figure 1 schematically shows a top view of a fire extinguishing system according to the invention 5 fitted in a ship's engine room,

Figure 2 is a vertical sectional view of the extinguishing system of Figure 1 at point AA,

Fig. 3 schematically shows a low pressure nozzle according to the invention in partial vertical section 10,

Figure 4 is a section along line AA of Figure 3,

Figure 5 shows the nozzle flaps obliquely from below and from the side, and Figure 6 shows the second flap of Figure 5 seen from below.

Figure 1 shows the ship's engine room 10, which has two main engines 12 and 14. The engine room 20 is fitted with a general fire extinguishing pipeline 16 and a target fire extinguishing pipeline 18 in connection with the main engines at regular intervals with universal nozzles 20 from which water jets can cover the entire room. In the solution of Figure 1, the general extinguishing pipeline 16 and the target extinguishing piping 18 are two different piping systems.

The system of Fig. 2 corresponds to the system of Fig. 1, except that the general extinguishing piping 16 on the main engines 12 and 14 and extending along the ceiling 21 is provided with target nozzles 22 in addition to the general nozzles 20. The target nozzles 22 are arranged close to the main engines 12, 14 so as to be able to spray water at all necessary points on the machines. The nozzles 5 are specifically arranged so that any damage to the high pressure pipes 24 of the machinery and the resulting fire can be extinguished. The fuel lines 24 are completely covered by the jet of target nozzles 22. Further, as shown in Figure 1, a portion of the target nozzles 23 10 are arranged in the system so that water can be sprayed therefrom into the space surrounding the fuel line, i.e., ensuring that at each point of the fuel line extinguishing fluid is absorbed into the firebox.

15

The general nozzles 20 can be mounted on the ceiling or elsewhere above the main engines at a distance of about 1.5 to 3 meters from each other. They are preferably arranged so that the water jets 20 from the nozzles completely cover the horizontal V-area of the engine room above the objects to be protected. The target nozzles 22 may be fitted in a range of 0.3 to 0.7 m, preferably n.

0.5 m apart. The optimal spacing between the nozzles is dependent. 25 distance between and 25 nozzles to be protected ;;; how wide the water jet from the nozzles forms.

; Figure 1 further shows an extinguishing fluid reservoir 26 arranged outside the engine room and pumps 32 and 34 connected thereto with valves 28, 30 for supplying extinguishing liquid to piping 16 and 18. The additive concentrate, which is mixed with the extinguishing water, can be 15 η. Η Γ \ II ζ. Η 4 υ e.g., consisting of 10-30% preferably 16-21% ammonium phosphate, 1-5% preferably 2.5-3.5% ammonia, 1-5% preferably 3-4% urea and the remainder of the water The concentrate is mixed with the quench water 5 so that the amount of concentrate in the water is 2 to 7%, whereby, for example, the amount of monoammonium phosphate in the water is about 0.5 to 1.5%.

Figures 3 and 4 show a low pressure nozzle 36 for use in the system 10 according to the invention. The nozzle comprises a cylindrical body member 38 having an inlet 40 and a discharge port 42. The nozzle body 44 has a water guide 46. two inclined blades 50 and 52 on the discharge opening side. The blades are substantially semicircular in shape and form together in a horizontal plane corresponding to the cross-section of the housing as shown in Figure 4.

As shown in Fig. 5, the fins are attached to each other by a neck 54 and to a support plate, substantially at the center of the arcs of the circle of the fins. Siivekkei-. The openings 60 and 62 are formed at the bottom of the straight sides 56 and 58 of the water. The water flows along the flaps below them while providing a circular path of motion.

The support plate 48 thus divides the water flow from the inlet into two parts. The various parts are guided by the wings: · with the booms 50 and 52 facing downwards to the opposite sides of the housing 44 ··. sides and over the lower edge of the straight sides 56 and 58 of the blades and through openings 60 and 62 below the flaps 16 Λ Λ ^ r, 1 n I I £ L. Below the blades are formed two successive jets, e.g., clockwise, which discharge from the nozzle at least partially in the form of a rotating jet. The shower consists of 5 droplets of different sizes which are oriented to the shower according to its size.

For example, from the nozzles on the ceiling, the droplets of the water jet descend as a front. Larger droplets 10 carry smaller ones which absorb heat from the surroundings. In the system of the invention, large droplets, which are generally better than small ones, are capable of penetrating up to the flames, even through the flue gas mattress up to the flames. In a focal point, small droplets have better penetration than large droplets.

The extinguishing system according to the invention is suitable for extinguishing a wide variety of fires because of its highly effective extinguishing properties. The extinguishing system can even be used to extinguish a burning polar or molten metal.

The invention is not intended to be limited to the exemplary embodiment described above, but may be applied within the scope of the following patent claims. In addition to the above, the sprinkler system according to the invention can be used in a wide variety of factory halls: 30 and also, for example, in homes for the elderly and in churches.

Claims (9)

112440 17 An extinguishing system for extinguishing a fire in confined spaces (10), such as ship's engine rooms, power stations, hotel rooms or open oil tanks, comprising a plurality of nozzles comprising a plurality of nozzles comprising general nozzles (20) arranged above and / or and / or target nozzles (22, 23) arranged around fire-sensitive objects in the protected state, such as machines (12, 14), fuel supply pipelines (24) or open oil tanks, at least a portion of which are low pressure nozzles, At a pressure of 12 bar, preferably 2 to 12 bar, said low pressure nozzles comprising 20 - a body member (38) having an inlet opening (40), a nozzle body (44) and a discharge opening (42), and a guide body (46) inside the nozzle housing, said o hay- \! With 25 pieces comprising two guide vanes: (50, 52) for directing a jet of water out of the nozzle,> '' · characterized in that •, - —- t, - extinguishing water contains 0.5-1.5% fire »I 30 an anti-inflammatory agent such as »· i monoammonium phosphate, ammonia, and / or urea, and j - said guide member (46) comprises» · 112440 18, in addition to the guide vanes (50, 52), a support plate (48) extending and having a width substantially the same as the diameter of the nozzle body, the control member 5 splitting the water flow from the inlet into the nozzle body, the control body providing at least a partially rotating water mist jet consisting of than the inside, and so on The smaller droplets have a higher frequency in the interior of the water jet 15 than in its outer circumference. Extinguishing system according to Claim 1, characterized in that the low pressure nozzles are arranged to spray extinguishing water in droplets having a diameter of 0.1 to 1 mm, preferably 0.1 to 0.5 mm, and that the average droplet diameter increases from the inside of the shower. at least 20%, preferably more than 50%, when going to the periphery. *: 25 A fire extinguishing system according to claim 1, characterized in that the low pressure nozzles are arranged in a fixed space so that; the jet from at least one nozzle (22, 23) can be applied in the event of a fire to the vacuum side of the resulting stove 30, whereby the extinguishing water is absorbed from this jet into the stove. · * · | Power system fire suppression system 112440 19 according to claim 1, characterized in that the water used for extinguishing the system is unsalted water, such as distilled water, to which 0.5 to 1.5% of a fire retardant active agent is added. 5 Use of a nozzle, the nozzle comprising a body member having an inlet (40), a nozzle housing (44) and an outlet (42), and a guide member (46) disposed within 10 said nozzle housing (44), said guide member further comprising a support plate ( 48) extending in the direction of the axis of the nozzle body and having the same width as the diameter of the nozzle body 15 and two guide vanes (50, 52) below the support plate (48) at the discharge end of the control body. 20 in a fire extinguishing system for extinguishing a fire; in confined spaces (10) such as ship's engine rooms, switchboards, hotel rooms or open "oil tanks" where the extinguishing water • contains 0.5-1.5% of a fire re-ignition • 25 active ingredients such as monoammonium phosphate, ammonia and / or urea, and the extinguishing water is sprayed at a pressure of <12 bar, preferably 2 to 12 bar, in which system the vanes cause the 30 jets to exit at least partially from their nozzle as a jet of rotation, whereby larger water droplets tend to accumulate: 20 water jets inside. 6. A method of extinguishing a fire with an automatic extinguishing system in confined spaces such as 5 ship engine rooms, switchboards, hotel rooms or open oil tanks comprising a plurality of nozzles comprising fixed general nozzles (20) mounted above and / or 10 on the protected space for general fire extinguishing; or fixed target nozzles (22, 23) arranged around fire sensitive objects such as machinery (12, 14), fuel 15 feed lines (24) or open oil tanks to extinguish fires in at least a portion of said plurality of nozzles having 20 low pressure nozzles having ,! the method comprising the steps »introducing a quench water stream into the nozzle body through an inlet (40), directing the water stream in the nozzle body by means of two guide vanes (50, 52), * - discharging water from the nozzle body through a mist outlet (42); ': <12 bar, preferably 2-12 bar,'; characterized in that the method further comprises 30 steps ;;; - 0.5 to 1.5% of a fire retardant active agent such as: monoammonium phosphate, ammonia and / or 112440 21 urea is added to the water jet and the water stream is divided into two parts by a support plate (48) upstream of the guide flaps, 5. guiding two portions of the water flow with guide vanes to one side of the nozzle housing where the water is sprayed out as a mist jet which at least partially rotates about its own flow direction so that larger water droplets 10 collect on the surface and smaller water droplets on its interior. Method according to claim 6, characterized in that the jet of extinguishing water is supplied from the general or target nozzles so that the jet of water does not yet form a foam therein, whereby the extinguishing water is mainly directed towards the burning surface as a jet of water. The method according to claim 6, characterized. wherein at least one jet of extinguishing water is directed by the target nozzle (22, 23) to the vacuum side of the firebox formed at the fire site, whereby * the extinguishing water is absorbed from this jet into the firebox 25, extinguishing it. Method according to claim 6, characterized in that salt water is used as the extinguishing water,. such as distilled water supplemented with 0.5-1.5% of a 30 fire retardant active ingredient. 112440 22 {>