JPH09206399A - Discharging method of gaseous extinguishant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a whole area discharging type carbon dioxide fire extinguishing system to perform initial stage fire extinguishing keeping safety of human lives without confirming evacuation to extinguish a fire extremely quickly, by discharging the carbon dioxide extinguishant in two times. SOLUTION: Carbon dioxide gas is discharged at two times in the case of on fire in a whole-area discharging carbon dioxide extinguishant system. The first discharge time is automatically carried out at an instant a fire is detected. The second discharge is manually carried out after making a confirmation of human evacuation. The amount of the first discharge of carbon dioxide just after a fire detector detected on fire is set to be from 1/9 to 1/4 of the designed normal concentration of 34% of carbon dioxide. This makes carbon dioxide concentration in a targeted area to be 4 to 9%. Then, after making a confirmation of completion of human evacuation, the second discharge is conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fire extinguishing equipment used in the event of a fire, and more particularly to a method of releasing a fire extinguishing agent using a gas-based fire extinguishing agent.

[0002]

2. Description of the Related Art Conventionally, fire extinguishing equipment using carbon dioxide has been useful for extinguishing a fire by releasing a carbon dioxide extinguishing agent effective for extinguishing a fire into an object to be fire-prevented. However, since the designed concentration of carbon dioxide is relatively high, it causes oxygen deficiency to humans inside the fire prevention object, and in addition to the harmfulness of carbon dioxide, it is basically released to the space where humans are. Prohibited by the fire, delay time after a fire is detected, and
It was supposed to be released after confirming the absence of humans. Therefore, it is expected that the fire may not be able to be extinguished effectively due to the delay in release, and it is gradually being used.

On the other hand, fire extinguishing equipment using halogenated hydrocarbons (hereinafter abbreviated as "halon") as a fire extinguishing agent (especially halon 1301) has no fear of oxygen deficiency even if it is released at a designed concentration (usually 5%). Since halon gas is not harmful, it has come into widespread use because it has been regarded as useful. However, Halon has a greater ozone depleting effect than CFC, which has been banned because of its ozone depleting effect.

Various drugs have been tried to deal with this, but no one superior to halon has yet appeared.
Fluorinated hydrocarbons are rather effective, and by design, there is little concern about oxygen deficiency, and the harmful effects of fire-extinguishing agents are not a problem, and they have begun to be used. However, this gas contains a large amount of decomposed gas when it comes into contact with a flame, especially hydrogen fluoride, which produces about 10 times the amount of halon, and it is not in a state where humans can be inside the fire chamber, so it is the same as the carbon dioxide mentioned above. , It cannot be released until after confirmation of human evacuation, and it is necessary to give sufficient consideration to indoor ventilation after use.

[0005]

The method of the present invention eliminates the above-mentioned drawbacks of the prior art and realizes safety measures for carbon dioxide fire extinguishing equipment that has been conventionally installed.
It can be used safely not only when it is newly installed, but also by simply improving conventional equipment.

[0006]

SUMMARY OF THE INVENTION The present invention is a carbon dioxide fire extinguishing agent which is released in two portions. In whole-area emission type carbon dioxide fire extinguishing equipment, theoretically, the fire extinguishes at 2/3 of the design concentration (design value is 1.7 of theoretical value).
Even if the fire extinguishing agent concentration is low and the fire is not extinguished, the oxygen concentration in the fire prevention target will be reduced, so it can be considerably suppressed. Therefore, 1/9 or more of design concentration 1
First, / 4 or less is automatically discharged at the same time as the fire is detected. In this case, the carbon dioxide concentration in the fire prevention target is 4-9.
%, And the oxygen concentration is about 20-19%, there is almost no possibility that carbon dioxide poisoning will occur even if there is a person inside the fire prevention target, and evacuation behavior after that can be sufficiently performed. Moreover, even if the fire is not complete, it will be suppressed to some extent.

After confirming the completion of human evacuation,
If possible, the verifier will manually release the remaining volume and completely suppress the fire.

[0008]

As described above, the present invention releases the carbon dioxide fire extinguishing agent of the carbon dioxide fire extinguishing equipment of the whole area release type among the gas fire extinguishing equipment in two times at the time of fire, and at that time, the first time Is to automatically release at the same time when a fire is detected, and the second is to manually release after confirming the complete evacuation of human beings, aiming at safety as well as quick initial fire extinguishing.

According to the conventional method, after the fire is detected, the fire is confirmed and the apparatus is manually operated, and then the extinguishing agent is released only after a certain delay time. Therefore, the relationship between the time after a fire is detected and the concentration of extinguishing agent is as shown in "Fig. 1".

On the other hand, according to the method of the present invention, the automatic release of a part of the extinguishing agent is started at the same time when the fire is detected, and then the remaining amount is manually released after the confirmation of the human life. Since there is no fire extinguishing agent concentration, the extinguishing agent concentration increases as shown in FIG. 2, so the extinguishing end time will be much faster, and damage to the fire prevention object should be less.

[0011]

[Example] In the case of a parking lot in which the volume of the object to be protected is 450 m ³ , the required amount of fire extinguishing agent is 360 kg according to the provisions of the Fire Service Law. When this is placed in eight 45 kg containers, one of them is immediately discharged, and the remaining seven are second discharged.

[0012]

According to the method of the present invention, the initial fire can be extinguished without confirming the evacuation, so that the fire can be suppressed much faster than the conventional method. In addition, this method can be sufficiently dealt with by slightly modifying the conventional sensing and emission control system, does not increase the facility cost in particular, and can sufficiently function as a human life safety measure for carbon dioxide extinguishing equipment. is there.

[Brief description of drawings]

[Fig. 1] Extinguishing agent concentration increase curve in the case of the conventional method The increase of the extinguishing agent concentration in the case of the conventional method is to confirm the fire after sensing the fire, activate the fire extinguisher, and then delay the time. As it is released, it becomes such a curve.

[Fig. 2] Concentration curve of extinguishing agent concentration increase in the case of the method of the present invention. As for the increase of extinguishing agent concentration in the case of the method of the present invention, a part of automatic release starts immediately after detection of a fire, and further confirmation of the fire and evacuation of humans. After confirmation, the remaining amount is discharged, so a curve like this is obtained.

Claims (4)

[Claims] 1. Out of gas-based fire extinguishing equipment, carbon dioxide fire extinguishing agent of carbon dioxide fire extinguishing equipment of all area release method is released in two times at the time of fire, at that time, the first time is automatically released at the same time when the fire is detected. The second time is to manually release after confirming the complete evacuation of humans. 2. In the above emission method, the amount of carbon dioxide in the first portion which is immediately emitted at the same time as the reception of the fire detector is set to 1/9 or more and 1/4 or less of the normal design concentration of 34%, The emission method according to claim 1, wherein the carbon dioxide concentration in the fire protection target is 4-9%. 3. The release method as described above, wherein the designed concentration is 34
%, The carbon dioxide concentration in the fire protection target is set to 4-9% by reducing the first release rate, and the carbon dioxide concentration in the fire protection target is set to "claim 1" or "claim 2". Release method. 4. In a gas-based fire extinguishing facility, even in a fire extinguishing facility using a gas other than carbon dioxide, that is, nitrogen, argon, etc., as the fire extinguishing agent, the first automatic release performed when a fire is detected reduces the extinguishing agent concentration to 4-9%. A release method that suppresses and confirms the evacuation and then performs the second manual release.