JPH0833730A - Method and apparatus for fire extinguishment and burning restriction - Google Patents

Abstract

PURPOSE:To keep the interior of a mixed extinguish atmosphere in the oxygen deficient state (choking state) so as to restrain burning of a material to be burnt and carry through fire extinguishment by covering a material to be burned with a mixed extinguish atmosphere composed of atomized water drops and incombustible gas within the safe concentration. CONSTITUTION:A water spray nozzle WN and a gas nozzle Gn are placed close to each other on the ceiling SF of a room R having an opening part M. The water spray nozzle WN is connected to a water tank through a plunger pump PP. The gas nozzle GN is connected to a gas bomb for incombustible gas such as liquefied carbon dioxide through a gas discharge valve GP. A fire grate FT is filled with light oil KO and ignition is performed. Atomized water drops WD and carbon dioxide CO2 are respectively jetted from the respective nozzles WN, GN to form a mixed extinguish atmosphere MM of them and cover the fire grate, FT. Thus, the interior of the mixed extinguish atmosphere MM is kept in the oxygen deficient state (choking state) so as to restrain burning of the fire grate FT and carry through fire extinguishment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire extinguishing / combustion suppressing method using simultaneously water droplets of fine particles and an incombustible gas.

[0002]

2. Description of the Related Art As is well known, water, nonflammable gases other than halon, halogenated hydrocarbons, etc. have been used as conventional fire extinguishing agents. Have unique characteristics.

[0003]

Water is the most widely used because it is the cheapest fire extinguishing agent and has a large specific heat and heat of vaporization and a large cooling effect. However, if this water is ejected from the sprinkler head, wasteful water is increased, the required amount of water is increased, and indirect damage other than fire is increased in the form of water loss.

Non-combustible gases such as nitrogen N ₂ , carbon dioxide (carbon dioxide) CO ₂ and argon Ar have an extremely high extinction concentration of several tens of percent with respect to various combustible substances. Therefore, if this non-combustible gas is ejected, the oxygen concentration in the fire source part and its surroundings will drop, and it will be a dangerous state for the human body. Therefore, since this nonflammable gas cannot be used in a place where a person is present, its use place is extremely limited.

Halogenated hydrocarbons are so-called halon-based fire extinguishing agents, but their flame-extinguishing concentration is several%, which is extremely low. However, this halogenated hydrocarbon has been a problem because it is regarded as a main factor substance of ozone layer depletion. Further, this halogenated hydrocarbon causes thermal decomposition when heated, and a toxic substance such as phosgene is produced, which is dangerous.

In view of the above circumstances, it is an object of the present invention to effectively extinguish and suppress combustion without damaging the human body. Another purpose is to reduce water consumption and prevent water loss.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to achieve the above object by covering a combustible material with a mixed fire extinguishing atmosphere composed of water droplets of fine particles and an incombustible gas within a safe concentration.

[0008]

[Function] The fine water droplets are jetted from the water spray nozzle, and the non-combustible gas is jetted from the gas nozzle. As a result, a mixed extinguishing atmosphere composed of water droplets of fine particles and non-combustible gas is formed. The burned material in this atmosphere is cooled to an oxygen-deficient state (suffocation state), and the extinguishing and combustion are suppressed. Since the non-burning gas concentration at this time is within the safe range,
It does not harm the human body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. The water spray nozzle WN and the gas nozzle GN are arranged in proximity to the ceiling SF of the room R having the opening M. This room R has a length L, a width W of 900 mm, and a height H of 12
00 mm, and the opening M has a vertical KL of 900 m.
The horizontal width KW is 225 mm.

As the water spray nozzle WN, a spiral type, a pin type or the like is used. As shown in FIG. 2, the spiral type has a central hole CR in the flow passage FR of the nozzle body NB.
A spiral member SPT having a swirl hole SPR and a swirl hole SPR is provided. The water W is sprayed while forming a swirl flow by the swirl hole SPR to generate fine particle water droplets WD.

In the pin type, as shown in FIG. 3, a strainer SRN and an orifice OF are provided in the flow passage FR of the nozzle body NB, and a deflector DF is arranged so as to face the outlet of the orifice OF. The water W discharged in a columnar shape from the orifice OF is collided with the deflector DF to generate fine particle water droplets WD.

All of these nozzles are known. The fine particle water droplets generated by the nozzle WN are water droplets having a particle diameter that can float in the air, unlike the water droplets having a particle diameter of 1.5 to 0.5 mm emitted from a conventional sprinkler head or spray head. The particle size is about 100 μm or less, and especially when the particle size is 50 μm or less, the floating ratio is greatly improved.

The water spray nozzle WN is connected to a water tank (not shown) via a plunger pump PP. It is convenient to move a cylinder as this water tank, but this water tank is fixed and connected to a water supply facility such as a water pipe, and when the amount of water in the water tank decreases, for example, a float valve extinguishes the water from the water supply facility. You may make it supplement with water.
Incidentally, P1 is a pressure gauge.

The gas nozzle GN is connected to a gas cylinder (not shown) containing an incombustible gas through a gas release valve GP such as an electromagnetic valve. Nitrogen N ₂ and carbon dioxide CO ₂ (carbon dioxide) Argon A as non-combustible gas (inert gas)
r, a mixed gas of Ar 50% Ar, 30% nitrogen N ₂ and 20% carbon dioxide CO ₂ (trade name, Inagediene), and the like are used, and the characteristics of each nonflammable gas are as follows. Incidentally, P2 is a pressure gauge.

Nitrogen N2 has the advantage that it can be easily obtained by fractional distillation of liquid air and is inexpensive, but has a very small fire extinguishing effect and does not liquefy like carbon dioxide at room temperature even when pressurized, so it can be stored. It has the disadvantage of being inconvenient.

Carbon dioxide CO ₂ is obtained at a low price, and liquefies when a little pressure is applied, so that it can be stored more advantageously than nitrogen. Moreover, after use, almost everything evaporates and nothing is left behind, so it is beautiful. During evaporation, the liquefied carbon dioxide partially solidifies into so-called dry ice, which also sublimes, but during evaporation and sublimation, it absorbs latent heat and heats the vaporized gas until it reaches the ambient temperature. Since the heat is absorbed, the heat of the surrounding environment is taken away by that much, and therefore, the action of cooling is also added.

Argon Ar is a completely chemically inert gas and is the most suitable substance for dilution and extinguishing, but its extinguishing effect is worse than that of nitrogen, and it is much more expensive.

Next, the operation of the first embodiment will be described.
The fire tray FT was charged with 500 cc of light oil KO and then ignited. After 2 minutes, water spray nozzle WN and liquefied carbon dioxide C
The O ₂ gas nozzle GN was directed downward and simultaneously jetted to form a mixed fire extinguishing atmosphere MM of the water droplets WD and carbon dioxide GD, and the mixed fire extinguishing atmosphere MM covered the fire tray FT.

At this time, the discharge pressure of the water spray nozzle WN is 20.
kgf / cm ² , the flow rate is 2.94 L / mim,
Further, the discharge pressure of the gas nozzle GN is 1 kgf / cm ² , and the flow rate is 0.13 m ³ / mim. The light oil KO was cooled by the latent heat of vaporization of the water droplets, and the area around the oil KO was in an oxygen-deficient state (suffocation state), and the fire was extinguished 3 minutes and 53 seconds after the injection. At this time, the maximum concentration of carbon dioxide (CO ₂ concentration) was 9.2% and the estimated concentration of oxygen (O ₂ concentration) was 19.4%.
Met.

As is well known, carbon dioxide has a concentration (C
O ₂ concentration) may harm the human body and lead to death. Therefore, in order to prevent the dangerous state defined by the Industrial Safety and Health Act, that is, the O ₂ concentration from becoming 18% or less,
The CO ₂ concentration has to be adjusted.

As a result of the experiment, as shown in FIG. 4, it was found that the O ₂ concentration was 18% when the CO ₂ concentration was 14%, but for safety, the O ₂ concentration should be 19% or more. C
It is preferable to use it with an O ₂ concentration of 10% or less.

A second embodiment of the present invention will be described.
The difference between this embodiment and the first embodiment is that the gas nozzle GN for liquefied carbon dioxide gas has a discharge pressure of 0.5 kgf / cm ² and a flow rate of 0.
076 m ³ / min. In the second embodiment, the maximum CO ₂ concentration is 3.9% and the estimated O ₂ concentration is 2%.
It was 0.2%, and the extinction time was 1 minute and 52 seconds after radiation.

When a fire extinguishing experiment was conducted using only one of the water spray nozzle WN and the gas nozzle GN for liquefied carbon dioxide, none of them extinguished the fire.

In the above experiment, only the water spray nozzle WN
Release pressure is 20kgf / cm², The flow rate is
2.94 L / min, CO₂Maximum concentration is 0.95
%, Estimated O ₂The concentration was 20.8%.

On the other hand, when only the gas nozzle GN is used, the discharge pressure is 1 kgf / cm ² , and the flow rate is 0.13 m ³ / mi.
n, the maximum CO ₂ concentration was 7.9%, and the estimated O ₂ concentration was 1
It was 9.3%.

Next, a third embodiment of the present invention will be described. In this example, the concentration (%) of the burned material and the noncombustible gas
Experiments were conducted on the relationship between the precipitation amount of particulate water droplets (mm / m ² .min) and the success or failure of fire extinguishing, and the results are shown in FIG.

The case of extinguishing a light oil KO fire with carbon dioxide CO ₂ (KOCO ₂ ) will be described. (B) When the CO ₂ concentration is 18%, the precipitation amount of fine water droplets is 0 mm / m ² .
Even if it is min, the fire is extinguished (white triangle), and (b) When the CO ₂ concentration is 4%, the precipitation amount of fine water droplets is 0.32 mm / m.
Fire extinguishes at ² .min, and (c) Fine particle water drop precipitation is 0.52
In the case of mm / m ² .min, the fire was extinguished even when the CO ₂ concentration was 0% / m.

(D) When the CO ₂ concentration was 8% or 4% and the precipitation amount of fine water droplets was 0.15 mm / m ² .min, the fire was not extinguished. (Black triangle)

The case of extinguishing a light oil KO fire with nitrogen N ₂ (KON ₂ ) will be described. (A) When the N ₂ concentration is 29%, the fire extinguishes even if the precipitation amount of fine water droplets is 0 mm / m ² .min (white square) (b) When the N ₂ concentration is 4.5%, Extinguished the fire when the amount of precipitation of fine water droplets was 0.32 mm / m ² .min. (C) When the amount of precipitation of fine water droplets was 0.52 mm / m ² .min, the fire was extinguished even when the N ₂ concentration was 0%.

(D) The fire was not extinguished when the N ₂ concentration was 14.5% and the precipitation amount of fine water droplets was 0.16 mm / m ² .min. (Black square)

A case of extinguishing a heptane H fire with carbon dioxide CO ₂ (HCO ₂ ) will be described. (A) When the CO ₂ concentration is 19%, the fire extinguishes even if the precipitation amount of fine water droplets is 0 mm / m ² .min. (White circle) (b) When the CO ₂ concentration is 6%, the precipitation amount of fine water droplets Extinguishes when is 0.32 mm / m ² .min, and (c) Fine particle water droplet precipitation is 0.70 mm / m ² .min,
The fire was not extinguished when the CO ₂ concentration was 0%. (Black circle)

Based on the above experiment, the fire extinguishing effect can be improved without causing water loss by adjusting the concentration of various nonflammable gases and the precipitation amount of fine water droplets. Further, when it is necessary to reduce the precipitation amount of fine water droplets environmentally, the concentration of the nonflammable gas having a large fire extinguishing effect may be adjusted based on FIG.

On the contrary, when it is necessary to reduce the concentration of the non-combustible gas, it is sufficient to adjust the precipitation amount of fine water droplets having a large fire extinguishing effect on the basis of the desired concentration of the non-combustible gas based on FIG. .

Next, a fourth embodiment of this embodiment will be described with reference to FIGS.
This will be described below. An air conditioner 2, an ultrasensitive smoke detector 3 and a cubicle 4 are provided on a floor surface 1 of a room CR that is closed such as a computer room or a telephone exchange room.

A free access 5 is provided below the floor surface 1, and the air conditioner 2 and the cubicle 4 communicate with each other via the free access 5. Therefore, the wind generated in the air conditioner 2 rises in the room through the free access 5 and the cubicle 4 and returns to the air conditioner 2 as shown by an arrow A1, so that a so-called circulating air flow is generated. Various cables (not shown) are arranged in the free access 5.

On the outlet 2a side of the air conditioner 2, a water spray nozzle WN and a gas nozzle GN are provided. The water spray nozzle WN discharges fine particle water droplets having a particle size of about 100 μm or less, for example, about 50 μm, which easily floats in the air. The nozzles WN and GN are of the type of the first embodiment described above, but the nozzles WN and GN are arranged so that their ejection directions are different from each other.

For example, as shown in FIG. 8, a water spray nozzle W
A water droplet WD of fine particles is horizontally ejected from N, and carbon dioxide gas is vertically ejected from a gas nozzle GN of liquefied carbon dioxide, and this carbon dioxide gas is dispersed by colliding with the bottom surface 5a of the free access 5 or the bottom surface of the floor surface 1. After slowing down the speed, the particles are placed on a circulating air flow and mixed with the fine particle water droplets WD, whereby uniform mixing becomes possible.

As shown in FIG. 7, the ultra-sensitive smoke detector 3 includes a sampling tube 10, a sensor section 11, and a suction fan 1.
2 and. The sampling tube 10 is arranged at a place where smoke detection is required, for example, in the free access 5 or on the ceiling surface of the room CR, and is provided with a plurality of sampling air suction holes 13.

The sensor section 11 detects smoke in the sampling air SA sent from the sampling tube 10, and is equipped with a scattered light type, dimming type, or ionization type smoke detector. This high-sensitivity smoke sensor is superior in performance to a normal smoke sensor and has a smoke density of 0.01% / m to 0.
5% / m2 of smoke can be detected. Therefore, the initial fire can be reliably detected.

The upper surface 4a of the cubicle 4 has a mesh or louver shape so that air can flow therethrough, and the inside thereof is divided into an upper stage US, an interruption TS and a lower stage GS.

Acrylic AR is used as the burned material in the upper row US.
Is installed, and the middle stage TS and the lower stage GS are each provided with a fire tray FT filled with light oil KO as a burned substance.

Next, the operation of this embodiment will be described.
When the air conditioner 2 is started after the acrylic AR and the light oil KO are respectively ignited to start combustion, the wind generated from the air conditioner 2 becomes a circulating air flow as shown by an arrow A1.

When the water spray nozzle WN and the gas nozzle GN for liquefied carbon dioxide are simultaneously started and, for example, fine particle water droplets WD and CO ₂ gas GD having a particle diameter of about 50 μm are ejected, the water droplets WD and CO ₂ gas GD are , Ride on the circulating air flow, pass through the free access 5 and reach the inside of the cubicle 4.

Water droplets WD of fine particles in the cubicle 4
And CO ₂ gas GD are mixed extinguishing atmosphere, lower G
Surround S, light TS KO of middle TS and acrylic AR of upper US.

The circulating airflow passing through the inside of the free access 5 rises in the room and returns to the air conditioner 2 while carrying the fine particle water droplets WD and the CO ₂ gas GD. The particulate water droplets WD and the CO ₂ gas GD released in the room float in the air due to Brownian motion. Therefore, the room air is cooled and the room temperature is lowered.

From the water spray nozzle WN, 60 liters is 5
The gas nozzle G
55 kg of CO ₂ was released from N in 1 minute and 50 seconds.

The discharge time of the gas nozzle GN is shorter than that of the water spray nozzle WN for the following reason. When the relationship between the CO ₂ concentration in each stage GS, TS, and US in the cubicle 4 and the discharge time of the gas nozzle GN was tested,
As shown in FIG. 9, not uniform in the CO ₂ concentration in each stage, and the CO ₂ concentration of each stage is 10% is because it is found that a time when after two minutes from the start release. In this way, by controlling the discharge time of the gas nozzle GN, it is possible to use the gas safely and efficiently, and prevent waste of the gas.

Next, when the extinguishing condition of the burned material at each stage in the cubicle 4 was examined, it was as shown in FIG. Here, the amount of adhering particulate water droplets means the amount (minute) of the weight (g) of the particulate water droplets adhering to the test pieces provided in each stage, which is represented by the time (minutes) required for adhering. (A) When the light oil KO in the lower GS and the middle TS has a CO ₂ concentration of 7 to 8% and a particulate water droplet deposition amount of 0.06 g / 5 minutes, or a CO ₂ concentration of 6% and a particulate water droplet deposition amount. Is 0.
Extinguished the fire at 15g / 5 minutes. (B) CO ₂ concentration of 5.5%, fine water droplet concentration of 0.06
The fire was not extinguished at g / 5 minutes, or at a CO ₂ concentration of 5.5% and an amount of fine water droplets deposited of 0.11 g / 5 minutes.

The acrylic AR of the upper US has a CO ₂ concentration of 5.
The fire was extinguished when the amount of water droplets was 5% and the amount of water droplets was 0.06 g / 5 minutes, but the CO ₂ concentration was 3% and the amount of water droplets was 0.06 g.
The fire did not extinguish at / 5 minutes.

A fifth embodiment of the present invention will be described with reference to FIG. The difference between this embodiment and the fourth embodiment is the jetting direction of the water spray nozzle WN and the gas nozzle GN. In this embodiment, the jetting directions of both nozzles WN and GN are the same, for example, horizontal direction. However, the gas nozzles GN are arranged so that their ejection directions face each other, and the noncombustible gases GD ejected from the respective gas nozzles GN collide with each other and scatter, and when the speed becomes slow, the non-combustible gas GD mixes with the fine particle water droplets WD and becomes uniform. A mixed fire extinguishing atmosphere will be formed.

The embodiment of the present invention is not limited to the above, and for example, the water spray nozzle WN and the gas nozzle GN can be used.
As a matter of course, instead of jetting and simultaneously, the start times may be shifted.

In this embodiment, the air conditioner 2 is used as the carrier airflow generator. However, a fan dedicated to generating the carrier airflow is provided separately from the air conditioner 2 as the generator, and the fan is used for generating fine particle water droplets and carbon dioxide gas. You may make it operate | move at the time of discharge | release of incombustible gas.

Further, as the fire detector, instead of the high-sensitivity smoke detector, for example, a smoke detector operating at a smoke concentration of 5% / m may be installed on the ceiling surface or in the equipment, and a fire detector may be installed. A flame-type, gas-type or odor-type sensor that detects a flame, gas, or odor generated at times may be used, or a sensor that combines these may be used.

The present invention can be used not only for extinguishing and suppressing combustion, but also for cooling combustible substances before ignition,
It can also be used to prevent the occurrence of fire. In this case, it is necessary to dispose a temperature sensor that detects an abnormally high temperature before ignition around the combustible material.

[0055]

Since the present invention is constructed as described above, the combusted material is in an oxygen-deficient state (suffocation state) while being cooled by the water droplets of fine particles. Therefore, extinguishing the burned material effectively,
Combustion control can be performed.

Further, since the fine water droplets are used, the amount of fire extinguishing water used can be remarkably reduced as compared with the usual rainy water droplets. Therefore, water loss can be minimized.

Furthermore, by using a non-combustible gas at the same time as the water droplets of fine particles, it is possible to effectively extinguish and suppress combustion even at a gas concentration that is not harmful to the human body. That is, even if a fire is extinguished using such a nonflammable gas, it is not harmful to the human body, so that the range of use of the nonflammable gas can be greatly increased as compared with the conventional example.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a spiral type water spray nozzle.

FIG. 3 is a vertical cross-sectional view showing a pin type water spray nozzle.

FIG. 4 is a diagram showing a relationship between CO ₂ concentration and O ₂ concentration.

FIG. 5 is a diagram showing a third embodiment of the present invention and is a diagram showing the relationship between the CO ₂ concentration and the precipitation amount of particulate water droplets.

FIG. 6 is a sectional front view showing a fourth embodiment of the present invention.

FIG. 7 is a front view showing an ultra-sensitive smoke detection device.

FIG. 8 is an enlarged view of a main part of FIG.

FIG. 9 is a diagram showing the relationship between the CO ₂ concentration and the time from the start of release.

FIG. 10 is a diagram showing the relationship between the CO ₂ concentration, the amount of particulate water droplets attached, and fire extinguishing.

FIG. 11 is a diagram showing a fifth embodiment.

[Explanation of symbols]

 WD Fine water droplets GD Non-flammable gas MM Mixed fire extinguishing atmosphere WN Water spray nozzle GN gas nozzle

Claims (24)

[Claims] 1. A fire extinguishing / combustion suppressing method, which comprises covering a burned material with a mixed fire extinguishing atmosphere consisting of water droplets of fine particles and an incombustible gas within a safe concentration. 2. A fire extinguishing / combustion control method, characterized in that a substance to be burned is covered with a mixed fire extinguishing atmosphere consisting of water droplets of fine particles and an incombustible gas within a safe concentration at an abnormally high temperature before ignition. 3. A fire extinguishing / combustion suppressing method which comprises covering an object to be burned with a mixed fire extinguishing atmosphere consisting of water droplets of fine particles and an incombustible gas within a safe concentration at the initial fire. 4. The method for suppressing fire / combustion according to claim 3, wherein the smoke concentration at the initial fire is 5% / m or less. 5. Extinguishing / combustion suppression, characterized in that a mixed fire extinguishing atmosphere is generated by supplying particulate water droplets and an incombustible gas within a safe concentration to a carrier air flow, and the burned material is covered with the mixed extinguishing atmosphere. Method. 6. The method for suppressing fire / combustion according to claim 5, wherein the carrier air flow is a circulating air flow sequentially passing through the air conditioner, the free access and the cubicle. 7. The method for suppressing fire / combustion according to claim 1, wherein fine water droplets are sprayed from a water spray nozzle, and incombustible gas is discharged from a gas nozzle. 8. The method for suppressing fire / combustion according to claim 7, wherein the water spray nozzle and the gas nozzle are provided close to each other. 9. The method for suppressing fire / combustion according to claim 7, wherein the directions of discharge of the water spray nozzle and the gas nozzle are different from each other. 10. The method for suppressing fire / combustion according to claim 7, wherein the incombustible gas discharged from the gas nozzle is dispersed and decelerated by the collision means. 11. The method for suppressing fire / combustion according to claim 7, wherein the spray time of the water spray nozzle is longer than the discharge time of the gas nozzle. 12. The fire extinguishing / combustion suppressing method according to claim 1, 2, 3, or 5, wherein the particle diameter of the fine water droplets is 100 μm or less. 13. The method for suppressing fire / combustion according to claim 1, 2, 3 or 5, wherein the non-combustible gas is liquefied carbon dioxide gas or nitrogen gas. 14. The oxygen concentration at the time of releasing the nonflammable gas is 18
% Or more, The fire-extinguishing / combustion suppressing method according to claim 1, 2, 3, or 5. 15. A water spray nozzle for discharging fine water droplets having a particle size of 100 μm or less; a gas nozzle for discharging an incombustible gas; a first supply for supplying water for extinguishing water to the water spray nozzle when extinguishing or suppressing combustion. And a second extinguishing agent supply source for supplying an incombustible gas in an amount within a safe concentration to the gas nozzle; 16. A carrier air flow generation device for generating a gas flow for carrying the fine particle water droplets and the non-combustible gas when the fine water droplets from the water spray nozzle and the non-combustible gas from the gas nozzle are discharged. Item 15. A fire extinguisher / combustion suppressor according to Item 15. 17. The water spray nozzle and the gas nozzle are provided in a free access.
The fire extinguishing / combustion suppressing device according to 5 or 16. 18. The fire extinguishing / combustion suppressing apparatus according to claim 16 or 17, wherein the carrier airflow generator supplies the carrier airflow into the free access. 19. The fire extinguishing system according to claim 16, 17 or 18, wherein the carrier airflow generator is an air conditioner.
Combustion suppression device. 20. At least one pair of gas nozzles is provided, and the pair of gas nozzles are arranged so that their emission holes face each other.
The fire extinguishing / combustion suppressing device according to 17, 18, or 19. 21. The fire extinguisher according to claim 15, 16, 17, 17, 18, 19 or 20, wherein the water spray nozzles and the gas nozzles are arranged so that their discharge directions are different from each other. -Combustion suppressor. 22. The second supply source is a cylinder storing nonflammable gas having a safe concentration of nonflammable gas in the fire suppression space.
Fire extinguishing / combustion suppressing apparatus according to 7, 18, 19, 20, or 21. 23. The first supply source is a tank storing fire extinguishing water,
The fire extinguishing / combustion suppressing apparatus according to 18, 19, 20, 21, or 22. 24. A collision plate is provided in front of the discharge direction of the gas nozzle.
Fire extinguisher / combustion suppressor according to 7 or 21.