JP2009201695A - Foam fire extinguisher and foam fire extinguishing apparatus using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foam fire extinguisher, wherein the power of keeping the foaming state of foam generated in a foam fire extinguishing apparatus used for the pit of an oil tank and the culvert of an oil complex or the like is increased to improve a fire extinguishing effect, and the foam fire extinguishing apparatus using it. <P>SOLUTION: The foam fire extinguishing apparatus 1 is constituted so that the foam fire extinguisher WG radiated from a radiation nozzle 4 is made to collide with a foaming net 3 to foam, wherein 1.5% or less of water-soluble cellulose ether such as methylcellulose and/or 10% or less of an inorganic fire extinguishing chemical such as ammonium phosphate, potassium carbonate, boric acid or ammonium sulfide is added to the foam fire extinguisher. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a foam fire extinguisher and a foam fire extinguisher used in, for example, a pit of an oil tank, a culvert of an oil complex, a cabin, a hold, a parking lot, various dangerous goods facilities, and the like.

Various types of foam fire extinguishing equipment are used as fire extinguishing equipment. This foam fire extinguishing equipment collides a foam extinguisher radiated from a radiation nozzle against foaming foam to generate foam, covers the fire source with the foam, and extinguishes suffocation.
In this foam fire extinguishing equipment, foam may be broken and reduced by the heat of the fire, and a foaming state holding power is required.

  Therefore, it has been proposed to add and radiate a thermosetting gelling agent that increases the viscosity to the foam extinguishing agent (see, for example, Patent Documents 1 and 2). This proposal tries to prevent the spread of fire by utilizing the property that the foam attached to the wall of the building is cured by the heat of the fire and retains moisture by adding the thermosetting gelling agent. Is.

Japanese Examined Patent Publication No. 6-26622 JP 2004-154165 A

  In the conventional example, the foam generated in the foam fire-extinguishing equipment is broken if the heat of the fire is too strong, and it is difficult to obtain a fire-extinguishing effect without being in a foamed state as designed.

  In view of the above circumstances, an object of the present invention is to increase the holding power in a foamed state and improve the fire extinguishing effect.

  The invention according to claim 1 is characterized in that 1.5% or less of water-soluble cellulose ether is added to the foam fire extinguisher.

  The invention according to claim 2 is characterized in that 10% or less of an inorganic fire extinguishing agent is added.

  The invention according to claim 3 is the foam fire extinguishing equipment in which the foam fire extinguisher radiated from the radiation nozzle collides with the foaming net and foams, and the foam fire extinguisher is the foam fire extinguisher according to claim 1 or 2. It is an agent.

  In this invention, since the water-soluble cellulose ether is added to the foam extinguisher in an amount of 1.5% or less, the generated foam is cured by the heat of the flame. For this reason, since the holding power in the foamed state is stronger than that in the conventional example, the bubble breakage due to the heat of the fire is prevented, so that the fire extinguishing effect can be improved.

  Further, by adding the inorganic fire extinguishing agent, the aqueous solution fire resistance (see the experiment described later) is improved, so that not only oil fires but also general fires such as wood and paper can be effectively extinguished.

  The present inventor conducted various experiments on the assumption that, by adding a thermosetting gelling agent to the foam extinguisher, the generated foam is cured by the heat of the fire, and the foam retention is improved. As a result, 1.5% or less of water-soluble cellulose ether, which is a thermosetting gelling agent, is added to the foam extinguisher, and 10% or less of an inorganic extinguishing agent is further added to the foam extinguishing agent. It was found that a more suitable fire extinguishing effect can be obtained.

The water-soluble cellulose ether is added within a range of 1.5 to 0.1%, and the inorganic fire extinguishing agent is within a range of 10 to 0.1% so that fluidity can be secured as a foam aqueous solution. It is preferable to add in the inside.
The present invention has been completed based on the above findings.

A first embodiment of the present invention will be described with reference to FIG.
A foaming machine main body 2 of the foam fire extinguishing equipment 1 is provided in a room (chamber) which is a fire monitoring section. A foaming net 3 is stretched at the front end 2a of the foaming machine main body 2, and a radiation nozzle 4 is built in the rear end 2b. The radiation nozzle 4 is connected to a foam extinguishing agent supply pipe 6, and a foam extinguishing agent WG obtained by adding a thermosetting gelling agent G to the foam aqueous solution W is supplied to the supply pipe 6 from a storage pumping means (not shown). Is done.

In the foam aqueous solution W, 3% of Megafoam (registered trademark) F623T (3% type water film-forming foam fire extinguishing agent, Dainippon Ink & Chemicals, Inc.) is added to the fire extinguishing water.
The thermosetting gelling agent G is a water-soluble cellulose ether obtained by treating cellulose ether as a raw material with caustic soda and then reacting with the etherifying agent, and has a molecular structure in which water molecules can enter between cellulose ether molecules. It is what.

  As the water-soluble cellulose ether, for example, methylcellulose (trade name: Metroze Shin-Etsu Chemical Co., Ltd.), hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, and the like are used. In particular, methylcellulose has a low thermosetting gel temperature of about 55 ° C. (others are about 55 ° C. to 85 ° C.), and the state after gelation is hard.

Next, the operation of this embodiment will be described.
When a fire occurs in the fire monitoring area, a fire detector (not shown) detects the fire and transmits a fire signal to the control panel.
Then, since the control panel activates the foam fire extinguishing equipment, indoor air, that is, air K in a room in which the foaming machine body 2 is disposed is sucked into the foaming machine body 2 and the radiation nozzle 4. The foam extinguishing agent WG is emitted while becoming droplets.

  The droplets fall toward the fire source while colliding with the foaming net 3 to become bubbles B. Since the foam B contains the thermosetting gelling agent G, the foam B is cured when receiving heat from a fire, so that the holding power in the foamed state is increased and the foam is hardly broken. Therefore, the foaming state can be maintained for a long time, so that the fire extinguishing effect is improved.

A second embodiment of the present invention will be described.
The difference between this example and the first example is that an inorganic fire extinguishing agent was further added to the foam extinguishing agent of the first example (foam aqueous solution W to which the thermosetting gelling agent G was added). .

  This inorganic fire extinguishing agent is ammonium phosphate, and its addition amount is 5%. As the inorganic fire extinguishing agent, potassium carbonate, boric acid, ammonium sulfate, etc. can be used in addition to ammonium phosphate.

  In the second embodiment, as in the first embodiment, since the foamed state can be maintained for a long time, the fire extinguishing effect is improved and the aqueous solution fire resistance (refer to the experiment described later) is also improved. In addition to fires such as wood and paper, it can be effectively extinguished.

Next, the first and second experimental examples will be described.
First experimental example:
This experiment was a performance test as an aqueous foam solution, and as shown in Table 1, No. 1 to No. 4 experiments were conducted.

Foam
The No. 1 foam extinguisher is the addition of 3% of Megafoam (registered trademark) F623T (3% foamed water film extinguishing agent, Dainippon Ink & Chemicals, Inc.)
No. 2 foam extinguisher is No. 1 foam extinguisher, 5% ammonium phosphate, an inorganic extinguishing agent, is added as a thermosetting gelling agent (water-soluble cellulose ether). 0.5% added.

No.3 foam extinguisher is the addition of 0.5% methylcellulose to No.1 foam extinguisher
No.4 foam extinguisher is No.1 foam extinguisher with 5% ammonium phosphate added,
It is.

Test method of foaming performance (1) Put a foam extinguisher into a mixer, stir and foam.
(2) The foam in the mixer is transferred to a measuring cylinder, the foam volume is measured, and the foaming ratio is calculated.
(3) The time for the bubbles in the graduated cylinder to be reduced to an aqueous solution is measured. This time is the time for 25% of 100 cc bubbles to return to the aqueous solution, which is the so-called “reduction time”.

Test method of foam fire resistance (1) Water is put into a beaker to be laid, heptane is put on the beaker, and foam is placed on the heptane. The heptane layer has a thickness of 1 cm and the foam layer has a thickness of 5 cm.
(2) An LPG burner is placed above the beaker, and a flame is emitted toward the bubbles.
(3) The time until the bubble layer is broken and penetrated by the flame and the heptane is ignited, the so-called “bubble penetration time” is measured.

Aqueous solution penetration balsa material fire resistance test method (1) 1 cc of foam aqueous solution is dropped and infiltrated into a 10 cm × 10 cm × 150 cm balsa material with a syringe.
(2) The weight of the permeated foam aqueous solution is measured.
(3) The portion where the aqueous foam solution is permeated is blown from below with a flame of a gas burner for 5 minutes. The ambient temperature of the part is 450 to 500 ° C.
(4) Time for burning or carbonizing the balsa material, so-called “balsa material ignition time” is measured.

As is apparent from Table 1, No. 2 to No. 3 have a lower expansion ratio than No. 1, but the reduction time, bubble penetration time, and balsa material ignition time are improved.
In addition, the thermosetting gelling agent alone (No. 3) shows improvement in foam fire resistance, but there is no fire resistance as an aqueous solution (suppression of ignition of wood), almost the same value as No. 1. is there.
Furthermore, by adding a thermosetting gelling agent and ammonium phosphate (No. 2), there is a possibility that the fire resistance of the foam / aqueous solution is compatible. That is, there is a possibility of effectively extinguishing both general fires (fires such as wood and paper) and oil fires.

Second experimental example:
When a crib (burning object) fire extinguishing experiment was carried out using water, the results shown in Table 2 were obtained.

Foam
The No. 1 foam extinguisher is the addition of 3% of Megafoam (registered trademark) F623T (3% foamed water film extinguishing agent, Dainippon Ink & Chemicals, Inc.)
No. 2 foam extinguisher is the one obtained by adding 0.5% thermosetting gelling agent (methyl cellulose) to the No. 1 foam extinguisher and further adding 5% ammonium phosphate.
No. 3 foam extinguisher is the one obtained by adding 0.5% of thermosetting gelling agent (methyl cellulose) to the No. 1 foam extinguisher,

No. 4 foam extinguisher is the addition of 1% of thermosetting gelling agent (methyl cellulose) to the No. 1 foam extinguisher,
No. 5 foam extinguisher is the addition of 20% ammonium phosphate to the No. 1 foam extinguisher,
It is.

Experimental method In this experiment, the crib (burning object) is ignited and burned, and a foam extinguisher is applied on the crib from above. Adjust the flow rate of foam extinguishant from the water heater to 500 mL / 30 seconds, and “fire suppression time”, that is, the time until the flame becomes visibly smaller and the flame does not extend upward, , “Reburning time”, that is, the time from the fire suppression state until reburning is measured.

As is clear from Table 2, fire suppression was not possible with No. 1, but fire suppression times of No. 2 to No. 5 were 15 to 20 seconds.
Further, even with a thermosetting gelling agent alone (No. 3, No. 4), the fire extinguishing efficiency is improved by raising the temperature.

  The embodiment of the present invention is not limited to the above. For example, instead of using the low foaming Megafoam (registered trademark) F623T as the foam stock solution added to the foam aqueous solution, other foam stock solutions, A foam stock solution for foaming can also be used.

It is a longitudinal cross-sectional view which shows the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foam extinguishing equipment 2 Foam body 3 Foam net 4 Radiation nozzle WG Foam extinguishing agent B Foam K Air

Claims (3)

  A foam fire extinguisher, wherein 1.5% or less of water-soluble cellulose ether is added to the foam fire extinguisher.   The foam extinguishing agent according to claim 1, wherein 10% or less of an inorganic extinguishing agent is added. In the foam fire extinguishing equipment that foams the foam extinguisher radiated from the radiation nozzle by colliding with the foaming net,
The foam-extinguishing equipment, wherein the foam-extinguishing agent is the foam-extinguishing agent according to claim 1 or 2.

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