JPH0724080A - Combined fire extinguishing method consisting of carbon dioxide and aqueous fire extinguishing agent - Google Patents

Abstract

PURPOSE:To exert the maximum fire extinguishing activity using water and carbon dioxide in an amount as small as possible and to make the safety at hand be secured and the fire extinguishing effect larger, by injecting and merging liquefied carbon dioxide and aqueous fire extinguishing agents to atomize and discharge. CONSTITUTION:A carbon dioxide container 1 with a siphon and an aqueous fire extinguishing agent container 2 with a siphon are provided in this method and the bypass 3 is to pressurize the aqueous fire extinguishing agent container 2. Whereby the aqueous fire extinguishing agent is discharged from the nozzle 5 via the siphon from the pressurized container 2, the liquefied carbon dioxide is discharged from the nozzle 4, and they are collided near the nozzle outlet and injected as an atomized mixed fire extinguishing agent. As mentioned above, the injection energy based on vaporization of liquefied carbon dioxide is utilized for atomization of the aqueous fire extinguishing agent to fine particles, the cooling effect of carbon dioxide is raised by addition of the cooling means of water, and various levels of fire extinguish can be achieved according to the mixing ratio of both the agents.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel fire extinguishing method,
In particular, it relates to a novel fire extinguishing method in which a gas and a liquid fire extinguisher are mixed and atomized.

[0002]

2. Description of the Related Art A fire extinguishing method in which a water-based fire extinguishing agent is radiated by using carbon dioxide as a pressure source, or a fire extinguishing method in which only carbon dioxide is radiated has been conventionally used. However, in a small device such as a fire extinguisher, there is a limit to the fire extinguishing ability and the applicable range. Large-scale water-based fire extinguishing equipment requires complex auxiliary equipment such as an engine as a power source, an electric system, and a pump system. Further, it cannot be said that the fire extinguishing performance that the water originally should exhibit is fully utilized, such that the used water is not effectively used and flows out wastefully or causes water loss.

On the other hand, a large-scale carbon dioxide fire extinguishing facility is difficult to use for a fire in a closed space and has a small effect on solid combustibles because of safety considerations for human life, so it can be used only under limited conditions. There was a defect such as not being. For this reason, carbon dioxide fire extinguishing equipment finds its main application in fires that dislike water, such as electric fires.
Therefore, one of the expected future issues is to eliminate spillage and water loss for water and maximize fire extinguishing effects with a small amount.Next, for liquefied carbon dioxide, use cooling and diluting effects to a minimum. It is desirable to exert it in quantity.

[0004]

As a result of various studies to solve the above problems, the present inventor has completed the present invention, and the object of the present invention is to reduce the amount of water and liquefied carbon dioxide as small as possible. It is to provide a fire-extinguishing method and a fire-extinguishing agent that exert the maximum fire-extinguishing action by use.

[0005]

[Means for Solving the Problems] The gist of the present invention is to atomize liquefied carbon dioxide and a water-based fire extinguisher by injecting them together.
It is a fire extinguishing method characterized by radiating, and a gas-liquid mixed fire extinguisher characterized by atomizing a water-based fire extinguisher with liquefied carbon dioxide. That is, in the present invention, the water-based fire extinguishing agent is spray-merged with liquefied carbon dioxide and atomized to give a stronger cooling effect in addition to the dilution effect of oxygen and combustible gas concentration by carbon dioxide. Therefore, the application range and utilization effect as a fire extinguishing method can be expanded.

Although a fire extinguishing method in which carbon dioxide is used for diluting the concentration of oxygen and combustible gas has been conventionally known, the present invention is not limited to this conventional method of using carbon dioxide, and has liquefied carbon dioxide. A feature is that even a large amount of energy is effectively used for extinguishing a fire through the above means. That is, in the present invention, the injection energy based on the vaporization of liquefied carbon dioxide is utilized for atomizing fine particles of the water-based fire extinguisher, and the cooling effect of water is added to enhance the cooling effect of carbon dioxide gas and to mix the two. It is possible to provide a fire extinguishing method with various levels of fire extinguishing effect depending on the ratio. Moreover, in the present invention, since the evaporation rate of water is increased by atomization, the dilution effect of water vapor is also improved.

The present invention will be described in detail. The mixing ratio of carbon dioxide and the water-based fire extinguisher in the present invention can be freely changed depending on the diameters of the blowing nozzles and the method of pressurizing the water-based fire extinguisher container, so that a wet gas can be generated according to the fire target. Radiation from the container of the water-based fire extinguisher may be reduced pressure suction by a carbon dioxide gas flow utilizing the principle of Venturi and pressure extrusion. In the depressurization method, the carbon dioxide and the water-based fire extinguishing agent are mixed in the nozzle, so that the cryogenic temperature associated with the evaporation of the liquefied carbon dioxide causes the water to immediately freeze and easily clog the nozzle.
Therefore, anti-freezing measures are necessary. On the other hand, in the pressurizing method, since both are radiated into the atmosphere and then collided in the vicinity of the tip of the nozzle, the nozzle of the water-based fire extinguisher is not directly exposed to cryogenic temperature and there is no fear of freezing. The water spray generated by the intense radiation pressure of liquefied carbon dioxide flows in the direction of carbon dioxide radiation. By changing the incident angle of the water stream with respect to the carbon dioxide stream, the expansion angle of the spray and the particle size of the water droplet can also be changed.

The liquefied carbon dioxide is extruded and ejected from the siphon reaching the bottom in the carbon dioxide container by receiving the pressure of the vaporized portion. When carbon dioxide is emitted in a gaseous state from a container without a siphon, vaporization occurs inside the container, causing a sharp drop in the temperature of the liquefied carbon dioxide, causing a sudden drop in pressure, making it impossible to achieve steady mixed injection. . In addition, the side wall of the container is frozen, and if it touches the skin, there is a risk of sticking. Liquefied carbon dioxide is partially vaporized in the pipe path to the blowing nozzle, and strictly speaking, it is in a gas-liquid mixed state. However, compared with mere vaporized gas, the amount of radiation can be significantly increased, and the original diluting effect of carbon dioxide is also exhibited.
The mixing ratio of water can be adjusted arbitrarily, and it is natural that the smaller the amount of water, the finer the particles can be, but the cooling effect is worse. Adjust the mixing ratio with water according to the fire target.

Here, the water-based fire extinguishing agent is an aqueous solution in which a commonly used chemical agent for fire extinguishing agents such as a surfactant and ammonium phosphate is dissolved in water. Conventionally,
There is no example in which liquefied carbon dioxide and a water-based fire extinguisher were intentionally mixed and put into practical use as a fire extinguisher.

The present invention will now be described with reference to the drawings. Figure 1
[Fig. 2] is an explanatory view showing a simple example of the basic configuration of the pressurized radiation system, and Fig. 2 is an example of a side view of the nozzle mechanism in Fig. 1. In FIG. 1, 1 is a liquefied carbon dioxide container with a siphon, and 2 is a water-based extinguishant container with a siphon. Reference numeral 3 is a bypass from the carbon dioxide path, and is for pressurizing the water-based fire extinguisher container 2. From the pressurized container 2, the water-based fire extinguishing agent is emitted from the nozzle 5 via the siphon. Further, liquefied carbon dioxide is emitted from the nozzle 4, and is jetted as a mixed extinguishing agent which has collided and atomized near the nozzle opening. In FIG. 2, 6 is a spring for changing the nozzle angle, and the distance from the nozzle tip to the collision confluence point can be changed by this angle, and the size of the spray particles and the reaching distance are adjusted. Reference numeral 7 surrounded by a dotted line is a can for housing a nozzle mechanism that also serves as a grip. The mixed fire extinguishing agent is emitted by opening the valve of the container 1 after opening the valve of the container 1.

Further, although the present invention will be specifically described with reference to examples, the present invention is not limited to these examples.

【Example】

Example 1 The extinguishing effects of a carbon dioxide extinguisher and this method were compared with respect to urethane foam, which is a flammable material that is extremely difficult to extinguish. This flammable material is a block 1 of 45 cm x 45 cm x 10 cm
It is an individual. In either method, 2.3 kg of carbon dioxide and 10 kg of water are charged and the irradiation is performed for 20 seconds. Fire extinguishing results Combustibles Carbon dioxide fire extinguisher This method From a distance of 1.5 m to a distance of 4 m Urethane foam Not extinguished Immediately extinguishing

[0012]

As described above, the effects of the fire extinguishing method of the present invention are listed below. (I) One of the features is that it can be applied to equipment as small as a fire extinguisher to large fire extinguishing equipment. (Ii) In the case of a large fire extinguisher, a conventional engine,
It requires complicated auxiliary equipment such as pumps and electric systems,
In the present invention, these auxiliary facilities are not used and the injection energy of the liquefied carbon dioxide itself is used, so there is a great advantage that a simple system can be manufactured. (Iii) Water can be pulverized into particles by a strong jet pressure and can be emitted to a long distance, so that safety at hand can be guaranteed. (Iv) The cold heat of the liquefied carbon dioxide is transferred to the water spray, which further cools the combustible material and has a great extinguishing effect. (V) In particular, the fire extinguishing effect is great under a closed or semi-closed condition such as an indoor fire or a parking lot fire. (Vi) Since the evaporation efficiency of water is high, not only cooling,
There is an advantage that the action as an inert gas is increased.

[Brief description of drawings]

FIG. 1 is a simple explanatory diagram of a basic configuration of a pressurized radiation system.

FIG. 2 is a side view of an example of a nozzle mechanism.

[Explanation of symbols]

 1 Liquefied carbon dioxide container with siphon 2 Water-based extinguishant container with siphon 3 Bypass from carbon dioxide path 4 Liquefied carbon dioxide emission nozzle 5 Water-based extinguishant emission nozzle 6 Nozzle angle adjustment spring 7 Nozzle mechanism storage canister

Claims (2)

[Claims] 1. A fire extinguishing method comprising liquefying carbon dioxide and a water-based fire extinguishing agent by injecting them together to atomize and emit them. 2. A gas-liquid mixed fire extinguisher, characterized in that an aqueous fire extinguisher is atomized with liquefied carbon dioxide.