JPS587270A - Fire fighting agent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention refers to a fluorine-containing halogenated hydrocarbon (hereinafter referred to as Ron) which is liquid at room temperature or has a low vapor pressure. ) type fire extinguishing agent This relates to a fire extinguishing agent made by dissolving gold in liquefied carbon dioxide gas, which maintains a liquid state at room temperature and under high pressure, and filling it into a high-pressure container while keeping it in a liquid state.

Halon-based extinguishing agents have been used. In other words, when a halon-based fire extinguisher is exposed to a high-temperature atmosphere such as a fire, it has a negative catalytic effect that completely stops the combustion reaction and actively extinguishes the fire, so it has the advantage of being extremely effective in extinguishing fires. It is known as a fire extinguishing agent. Examples of this type of extinguishing agent include bromotrifluoromethane (CF, Br: hereinafter referred to as Halon 1301) and bromochlorodifluoromethane (CF2Cl Br: hereinafter referred to as Halon 1211).
In addition to dibromotetrafluoroethane (C2F4B r
t: hereinafter referred to as “Halon 2402”), dibromohexafluoroprop7 (C, FIBr,: hereinafter referred to as Halon 3602)
), dibromodifluoromethane (CF, Br, :
(hereinafter referred to as Halon 1202), etc. are used.

Among the above halon-based fire extinguishing agents, Noron 1301 and Halon 1211 are gases at normal temperature and pressure, and do not contaminate the extinguishing area when extinguishing a fire. It has become widely used as a fire extinguisher for equipment and electrical equipment. However, Halon 1301 has the disadvantage that raw materials are expensive and many manufacturing steps are required to obtain Halon 1301, making it expensive. From this kind of thing, Heron 130
It has been proposed not to use 1 alone, but to use it in combination with an inert gas such as nitrogen gas or carbon dioxide gas to eliminate the economic disadvantage, but no satisfactory solution has been found. The current situation is that this has not been achieved.

Halong 1211 @excluding Halong 2402, Hawon 3602
, Halon 1202, etc. are in a liquid state at normal temperature and pressure, and are cheaper than Halon 1301. Therefore, it is fully effective when used as a fire extinguisher for large-scale oil fires, etc., but when used as a fire extinguisher for electronic equipment and electrical equipment in place of the expensive 4-maron 1301 mentioned above, it can be used at room temperature. Since it is in a liquid state under normal pressure as described above, it contaminates all areas where it is used, causing problems in insulation, wiring, etc. of electrical circuit systems. Furthermore, even if these liquid halon-based extinguishing agents are sprayed under pressure using pressurized gas and used in the form of a mist, all of the sprayed particles are liquid and rain down in the form of droplets. In addition, as the pressure of the pressurized gas decreases with use, the droplet particles become larger, and as a result, the area around the place of use is contaminated by the droplets, and the inconvenience caused by this is unavoidable. 1301 was inappropriate for use as a fire extinguisher for electronic and electrical equipment such as computers and aircraft equipment.

The present invention was developed in view of the above-mentioned current situation, and its characteristics are that the Heron-based fire extinguishing agent, which is liquid at room temperature and normal pressure, can be used as a liquefied carbon dioxide gas, which remains liquid at high pressure, to All headings to be uniformly dissolved and mixed at composition concentration,
Furthermore, based on the knowledge that if all of this was ejected, it would become extremely fine smoke, a Noron type extinguishing agent, which was liquid at room temperature, was dissolved and mixed with liquefied carbon dioxide gas, which was liquid under high pressure, and at 1111. It is a fire extinguishing agent that is filled in a pressurized gas pressure container so as to maintain its liquid state.This extinguishing agent can be used in place of the expensive Halon 1301 in electronic equipment,
When used as a fire extinguisher for electrical equipment.

◇ The halon-based fire extinguishing agents used in the present invention include Helon 2402 (boiling point 47.2r) and Halon 3602, which are liquid at room temperature.
(boiling point 71.CI'), Halon 1202 (boiling point 24.
．． 4C'), and Halon 1211 (boiling point -3.4C), which has an even lower vapor pressure and becomes liquid at room temperature under slight pressure. It has been experimentally confirmed that these Heron-based extinguishing agents can be uniformly dissolved and mixed in liquefied carbon dioxide gas at any composition concentration. The figure shows the concentration composition (wt%) and holding pressure 1 at room temperature when Halon 24 ()2 is dissolved in liquefied carbon dioxide gas.
/i (gauge pressure)] is the original one. As is clear from the figure, if the total amount is liquefied vertical acid gas, the temperature (25
In C), a pressure of 65 Ky/al (gauge pressure) is required to maintain the liquid state, and when all of Halon 2402 is sequentially dissolved and mixed, the pressure required to maintain the liquid state increases as the amount of Halon 2402 increases. The composition concentration of Halon 2402't5G weight% and liquefied carbon dioxide gas 50% by weight is approximately 50 Kf/- (gauge pressure), and furthermore, Halon 2402'i80 weight% gold liquefied carbon dioxide gas 20m-3.
At a composition concentration of 1-, it is about 30 porcelain/aII (gauge pressure).

After filling the pressure vessel with Heron 2402' to have various concentration compositions, liquefied carbon dioxide gas is charged under pressure, dissolved and mixed, and then spouted from the nozzle opening. The gas expands to atmospheric pressure and the large part becomes fine snow-like dry ice, and this powder snow-like dry ice is accompanied by Heron 2402 and is ejected. When exposed to atmospheric temperature, it instantly sublimates and gasifies, and due to the rapid expansion during this gasification, the entrained hole liquid Halon 2.402 has a particle size of 5.
We confirmed all phenomena such as forming a microscopic aerosol of less than 5 microns, ■Natsunen Halon 2402 becoming a microscopic aerosol of less than 5 microns, becomes extremely volatile and floats in the air, and is almost in a gaseous state. .

In addition, ■ Filling pressure into the pressure vessel ti15Kt/cII (
If the pressure is higher than the gauge pressure, proper injection is possible.
The composition concentration at this time was about 90 weight tons of Halon 2402*1 - about 1.0 weight tons of liquefied carbon dioxide. ■The initial filling pressure into the pressure vessel is always maintained despite the decrease in liquid volume O due to use, and there is almost no change in the composition concentration, and Halon 2402 with a constant composition concentration is always ejected. etc. were recognized.

Next, the extinguishing agent of the present invention will be explained in more detail using Halon 2402' as an example.

EXAMPLE A pressure-resistant container (proof pressure 250 Kf/+J) with a volume of 471 is filled with Halon 2402, and liquefied carbon dioxide gas is injected under pressure to obtain a fire extinguishing agent having a desired concentration as shown in Table 1 below.

The following fire extinguishing tests were conducted on extinguishing agents with these concentration compositions. In other words, there are 301 parts of water and 3 parts of gasoline in a container measuring 45 x 45 x 30 m in length, width, and height, respectively!
When the entire container was contained and ignited, a fire surface of 2 o ocd'6 was formed (extinguishing ability unit B-1) and a fire extinguishing test was conducted, the results shown in the table were obtained. It should be noted that after a pre-combustion time of t-1 minutes, it started to emit light and was extinguished after 10 seconds.

In the above fire extinguishing test, each sample was placed in a pressure-resistant container and the extinguishing agent jetted out through the jet nozzle became finer particles (1μ or less) as the filling pressure was higher, and it was in a state where it was extremely volatile and could be used immediately in the event of a fire. Vaporize. Therefore, even after using it for extinguishing a fire, it was possible to extinguish the fire without staining the area where it was used.

In addition, although the above embodiment described Halon 2402,
In addition to Halon 2402, Halon 360 is liquid at room temperature.
2. Halon 1202 can be treated in the same manner as Halon 2402, and Halon 1211, which has a low vapor pressure and becomes liquid at room temperature even with a slight pressure, can also be used to liquefy carbon dioxide under pressure to maintain the liquid state at room temperature. The Halon 2 can be uniformly dissolved in any concentration and stored.
Shows the same fire extinguishing effect as 402.

Fire extinguishing 1i of the present invention! As mentioned above, J is a liquid halon extinguishing agent that is either liquid at room temperature or under slight pressure in liquid carbon dioxide gas, and the liquid carbon dioxide gas remains liquid at room temperature under pressure. Since it is stored and injected in its entirety at the time of use, compared to conventional gaseous Heron-based extinguishing agents, the storage volume is extremely reduced for the same usage amount, and the usable capacity is increased for the same storage volume. Since it can form fine particles when injected, it has the same fire extinguishing effect as Halon 1301, which is a gas at room temperature, and does not pollute the area where it is used. Therefore, it can be used for extinguishing electronic equipment, electrical equipment, etc. in place of expensive Halon 1301.

Furthermore, unlike extinguishing agents that use only halon, carbon dioxide gas is mixed in, which reduces the amount of hydrogen fluoride (HF) in the decomposed gas generated during extinguishing, making it safer for animal and human health. It also has many advantages, including great hygienic effects.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a diagram showing the relationship between the composition of Halon 2401 of the present invention when dissolved in liquefied carbon dioxide gas and the pressure at which the liquefied carbon dioxide gas remains completely liquid at room temperature. "/cm" (Mr. Gage)

Claims (1)

[Claims] 1. A non-ron-based fire extinguishing agent that is liquid at room temperature or becomes liquid under slight pressure. Dissolve it in fully liquefied carbon dioxide gas and place it in a pressure-resistant container under a pressure that maintains the liquefied carbon dioxide gas at room temperature and in its liquid state. Fire extinguishing agent stored.