JP2008119170A - High expansion foam extinguishing facility and its foaming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a foaming ratio from being degraded in a high expansion foam extinguishing facility used in a pit of an oil tank, a culvert of an oil industrial complex, a cabin or a boathouse or the like and its foaming method. <P>SOLUTION: The high expansion foam extinguishing facility comprises a foaming part 3 provided with radiation nozzles 9 and an air suction part 5 for supplying air in a discharge section 1 to the foaming part 3. In the inside of the air suction part 5, steel wool 19 for transmitting suction air and a spray nozzle 10 for spraying water W toward the steel wool 19 are provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high expansion foam fire extinguishing equipment and a foaming method thereof used in oil tank pits, oil complex culverts, cabins, holdhouses, and the like. The present invention relates to an expanded foam fire extinguishing equipment and a foaming method thereof.

  In the foam fire extinguishing equipment, the foam aqueous solution is discharged from the radiation nozzle, blown into the foaming net and blown in by sucking air, and the fire source is filled with the foam to extinguish the suffocation. The foam fire extinguishing equipment includes a low foaming fire extinguishing equipment and a high foaming (high expansion) fire extinguishing equipment.

  In both the fire extinguishing facilities, the expansion ratio is different, for example, the expansion ratio of the low expansion fire extinguishing facility is 20 or less, and the expansion expansion ratio of the high expansion fire extinguishing facility is 80 or more and less than 1000. Here, the expansion ratio refers to the volume ratio between the aqueous foam solution and the generated foam.

  In order to generate highly expanded bubbles, for example, bubbles with an expansion ratio of 500 or more, it is necessary to take in a large amount of air from the upstream side of the radiation nozzle. The method (called “outside air”) is generally used.

  However, in this outside air, since outside air is used, a duct is penetrated in the building, or a bubble generator is provided by making a hole in the partition wall. .

  Therefore, in order to solve the above problem, a high-expansion foam fire extinguishing equipment of a system (referred to as “inside air”) that sucks air in a compartment that discharges bubbles is used (for example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 6-165837

  In the high expansion foam fire extinguishing equipment of inside air, the foaming ratio may not be as designed depending on the quantity and quality of smoke generated at the time of fire. For example, when the designed foaming ratio is 500, the actual foaming ratio is 100. When the expansion ratio is reduced in this manner, it is impossible to completely cover the fire source with the bubbles, so that the suffocation can not be effectively performed. The cause of the reduction in the expansion ratio will be described in detail later, but it is mainly the presence of smoke in the air.

  In view of the above circumstances, an object of the present invention is to prevent a reduction in expansion ratio.

  The present invention is a high expansion foam fire extinguishing equipment comprising a foaming part having a radiation nozzle and an air suction part for supplying air from the discharge section to the foaming part; The present invention is characterized in that a purifying porous object that allows suction air to pass through and a spray nozzle that sprays a purifying liquid toward the purifying porous object are provided.

  The porous object for purification according to the present invention is steel wool. The purifying solution of the present invention is water or an aqueous foam solution.

  The present invention is a high expansion foam fire extinguishing equipment comprising a foaming part having a radiation nozzle and an air suction part for supplying air from the discharge section to the foaming part; A foaming method using a high-expansion foam fire extinguishing equipment provided with a purification porous body that allows suction air to permeate and a spray nozzle that sprays a purification liquid toward the purification porous object; from the spray nozzle The cleaning liquid is sprayed to adhere to the cleaning porous object, and the smoke in the suction air that permeates the cleaning porous object is adsorbed to the attached droplets, and then the suction air is applied to the foaming portion. It is characterized by supplying.

  The present invention is a high expansion foam fire extinguishing equipment comprising a foaming part having a radiation nozzle and an air suction part for supplying air from the discharge section to the foaming part; A foaming method using a highly porous foam fire extinguishing equipment provided with a purifying porous body that allows suction air to permeate and a spray nozzle that sprays water or an aqueous foam solution toward the purifying porous body; After spraying water or an aqueous foam solution from the spray nozzle to adhere to the porous object for purification, the smoke in the suction air that permeates the porous object for purification is adsorbed to the adhered droplets, Suction air is supplied to the foaming part.

  Since the present invention is configured as described above, the smoke contained in the indoor air sucked into the air suction portion, that is, the indoor air in which the air suction portion is disposed, The cleaning liquid is sprayed from the liquid, passes through the cleaning porous object in a wet state, and falls while being adsorbed by the droplets adhering to the object. Therefore, since the fall of a foaming ratio can be suppressed, the stable foaming performance can be obtained and fire extinguishing can be performed effectively.

  In addition, since the spray nozzle only needs a spray amount enough to wet the porous object for purification, the amount of the purification liquid used is significantly larger than the case where only the spray nozzle is used without using the porous object for purification. Can be reduced. In addition, the attached droplets slowly fall over time due to their own weight, so that the smoke (particles) can be sufficiently adsorbed.

  The present inventor researched and experimented on the cause of the decrease in the expansion ratio of the high expansion foam fire extinguishing equipment, and found that "smoke" had the main cause. This smoke is generated in the chamber (foam discharge section) due to the occurrence of a fire, but floats in the room as liquid fine particles, for example, fine particles having a particle diameter of 0.1 μm. These fine particles are supplied to the foaming part together with the air when the indoor air is sucked by the air suction part, and the foaming ratio is lowered.

Therefore, the present inventor considered that the problem could be solved by supplying clean air from which smoke was removed to the foaming portion, and conducted research and experiments on the means and the like.
As a result, a porous object for purification and a spray nozzle are provided inside the air suction unit for supplying room air to the foaming unit, and water sprayed as droplets from the spray nozzle or an aqueous foam solution The smoke (particles) in the suction air that is attached to the porous object and permeate the porous object is adsorbed by the attached droplet, and then the suction air may be supplied to the foaming portion. I understood. The present invention has been made based on the above findings.

A first embodiment of the present invention will be described with reference to FIG.
A room (chamber) 1 which is a foam discharge section is provided with a highly expanded foam fire extinguishing equipment. The fire extinguishing equipment has, for example, a foaming ratio of 500, and includes a foaming unit 3 and an air suction unit 5 that supplies air to the foaming unit 3.

  The foaming portion 3 is formed in a cylindrical shape, and a foaming net (net) 7 is stretched at the tip thereof, and a plurality of radiation nozzles 9 facing the net 7 at a distance are provided in the foaming part 3. Is provided. The radiation nozzle 9 is connected to a mixer (not shown) that generates an aqueous foam solution.

  The air suction part 5 is formed by a duct having the same diameter as that of the foaming part 3, and a spray nozzle 10 and a purifying porous object 19 are provided therein.

  The spray nozzle 10 sprays water adsorbing smoke or water droplets (droplets) of an aqueous foam solution to adhere to the porous object 19. The nozzle 10 sprays water droplets having a particle size of 50 to 100 μm, for example. A plurality of nozzles 10 are arranged on the upper wall in the downward direction, and the arrangement position, the number, etc. of the nozzles 10 can be appropriately selected as necessary.

  The purifying porous object 19 is an object having a plurality of gaps S through which suction air can permeate. For example, steel wool is used as the object 19. The type of the object, the arrangement amount, the air permeability, etc. are appropriately selected as necessary.

Next, the operation of this embodiment will be described.
When a fire occurs in the room (foam release section) 1, a fire detector (not shown) detects the fire and sends a fire signal to the control panel.
Then, since the control panel activates the high expansion foam fire extinguishing equipment, the indoor air, that is, the indoor air K in which the air suction part 5 is disposed is sucked from the air suction part 5 and radiated. The foam aqueous solution w is discharged from the nozzle 9 and the foam aqueous solution w collides with the foaming net 7 and sucks air while being refined to foam. This bubble is a high expansion bubble 12 that falls towards the fire source and covers the fire source. Therefore, the suffocation fire extinguishing, cooling fire extinguishing, etc. of the fire source can be performed.

  At this time, smoke H based on a fire is generated in the room 1, and this smoke H is sucked into the air suction unit 5 together with the indoor air K. Since the steel wool 19 and the spray nozzle 10 are provided, the water sprayed in the form of droplets from the spray nozzle 10 adheres to the steel wool 19, and the adhered water droplet F travels through the steel wool 19. And slowly falls over time due to its own weight.

  Therefore, the smoke (particles) H in the suction air passing through the gap S of the steel wool 19 is adsorbed in contact with the adhering water droplets F, so that the foaming part 3 has liquid fine particles (smoke ) Clean air K with reduced H concentration is supplied. Accordingly, it is possible to suppress a reduction in the expansion ratio, so that the fire can be extinguished efficiently.

A second embodiment of the present invention will be described with reference to FIG. 2. The same reference numerals as those in FIG. 1 have the same names and functions.
The difference between this embodiment and the above embodiment is that the foam aqueous solution is discharged from the spray nozzle 10 and the discharged foam aqueous solution is recovered and supplied to the radiation nozzle 9 of the foaming portion 3 for reuse. It is to be.

  That is, the storage unit 20 is provided in the lower part of the air suction unit 5, and the storage unit 20 is connected to the main pipe 30 via the pump P. The main pipe 30 is a pipe that supplies a foam aqueous solution to the radiation nozzle 9 of the foaming unit 3. Instead of the pump P, a mixer (not shown) may be provided in the main pipe 30, and the aqueous foam solution W recovered by the mixer may be supplied to the radiation nozzle 9.

It is a front view which shows 1st Example of this invention. It is a front view which shows 2nd Example of this invention.

Explanation of symbols

1 room 3 foaming part 5 air suction part 7 foaming net 9 radiation nozzle 10 spray nozzle 19 porous object for purification K air H smoke

Claims (5)

A high expansion foam fire extinguishing equipment comprising a foaming part having a radiation nozzle and an air suction part for supplying air from the discharge section to the foaming part;
A high-expansion foam fire extinguishing system, characterized in that a purifying porous body that allows suction air to pass therethrough and a spray nozzle that sprays a purifying liquid toward the purifying porous object are provided inside the air suction section. .   The high-expansion foam fire-extinguishing equipment according to claim 1, wherein the purifying porous object is steel wool.   The high-expansion foam fire extinguishing equipment according to claim 1, wherein the purification liquid is water or an aqueous foam solution. A foaming method using the high expansion foam fire extinguishing equipment according to claim 1;
The cleaning liquid is sprayed from the spray nozzle so as to adhere to the porous body for purification, and the smoke in the suction air that permeates the porous body for purification is adsorbed to the attached droplets, and then the suction air is A foaming method for a high expansion foam fire extinguishing equipment, characterized by being supplied to a foaming part. A foaming method using the high expansion foam fire extinguishing equipment according to claim 3;
After spraying water or an aqueous foam solution from the spray nozzle to adhere to the porous object for purification, the smoke in the suction air that permeates the porous object for purification is adsorbed to the attached droplets, A foaming method for a high expansion foam fire extinguishing equipment, wherein suction air is supplied to the foaming section.

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