JP2008086454A - Foam extinguishing system and its foaming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the lowering of an expansion ratio in a high expansion foam extinguishing system and its foaming method for use in pits of fuel tanks, culverts of petroleum industrial complexes, or cabins, holds and the like. <P>SOLUTION: The high expansion foam extinguishing system is provided with a foaming part 3 having a foaming net 7 and a radiation nozzle 9, and an air suction part 5 for supplying indoor air to the foaming part 3; and the air suction part 5, in its inside, has an atomizing nozzle 10 for clarification spraying misty droplet for adsorbing smoke H. <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; A spray nozzle for purification is provided.

  The purification spray nozzle of the present invention is a spray nozzle for spraying water or an aqueous foam solution. A foam aqueous solution sprayed from a purification spray nozzle is collected at a lower portion of the air suction portion of the present invention, and the collected foam aqueous solution is supplied to the radiation nozzle.

The present invention relates to a foaming method for a high expansion foam fire extinguishing equipment in which air in a discharge section is supplied to a foaming part, and an aqueous foam solution is discharged from the radiation nozzle in the foaming part to collide with a foaming net; Water or an aqueous foam solution is sprayed into mist-like water droplets by a purification spray nozzle provided inside the air suction unit, and smoke in the suction air is adsorbed to the water droplets, and then the suction air is It supplies to a foam part, It is characterized by the above-mentioned.
The present invention is characterized in that the foam aqueous solution sprayed from the purification spray nozzle is recovered and reused as the foam aqueous solution of the radiation nozzle of the foaming portion.

  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, is used for purification. It falls while being adsorbed by the mist-like water droplets ejected from the spray nozzle. 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.

  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 (fire extinguishing 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 purification spray nozzle is provided inside the air suction unit for supplying room air to the foaming unit, and water or an aqueous foam solution is sprayed into the mist-like water droplets by the purification spray nozzle. It has been found that after the smoke contained in the suction air is adsorbed to the water droplets, the suction air may be supplied to the foaming portion.
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 the foaming part 3, and a purification spray nozzle 10 is provided therein.

  The purification spray nozzle 10 is a nozzle that ejects water droplets that adsorb smoke. For example, a spray nozzle is used as the nozzle, and the spray nozzle 10 sprays water droplets having a particle diameter of 50 to 100 μm, for example.

  The nozzle 10 includes a plurality of downward nozzles 10a and a plurality of upward nozzles 10b, and both the nozzles 10a and 10b are disposed to face each other.

Next, the operation of this embodiment will be described.
When a fire occurs in the room 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 fire is generated in the room 1, and this smoke H is sucked into the air suction part 5 together with the indoor air K, but inside the suction part 5, Since the purification spray nozzle 10 is provided, the water sprayed from both the nozzles 10a and 10b spreads radially while forming mist-like water droplets F, collides at the center of the duct 5, Is diffused. Therefore, the suction air K containing the smoke H is adsorbed in contact with the water droplets F, so that clean air K in which the concentration of liquid fine particles (smoke) H is reduced is generated in the foaming portion 3. 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 cleaning nozzle 10, and the discharged foam aqueous solution is recovered and supplied to the radiation nozzle 9 of the foaming portion 3 to be reused. It is to use.
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 may be provided in the main pipe 30 and the foam aqueous solution W recovered by the mixer may be supplied to the radiation nozzle 9.

  According to experiments, it has been found that even when a foam aqueous solution containing smoke is supplied to the radiating nozzle 9, the expansion ratio is not lowered. Since the amount of the aqueous foam solution can be reduced by reusing the mist-like foam solution once in this way, there is a great economic advantage.

  The embodiment of the present invention is not limited to the above, and may be as shown in FIGS. Each figure will be described below. The same reference numerals as those in FIGS. 1 and 2 have the same names and functions.

  3 and 4, four spray nozzles 10 are provided in a cylindrical duct (air suction portion) 5 at equal intervals in the circumferential direction. A plurality of spray nozzles 10 are provided at equal intervals in the axial direction. The number of nozzles 10 to be arranged, the arrangement interval, and the like are appropriately selected as necessary.

  In FIG. 5, upward and downward inclined nozzles 10 that are inclined toward the axial center are provided in a duct (air suction portion) 5. The inclined nozzles 10 are opposed to the air K and smoke H suction directions. It is inclined in the direction to go (reverse direction). If the spray nozzle 10 inclined in this way is used, the collision energy between the spray F and the smoke H to be sprayed becomes large, so that the spray F easily adsorbs the smoke H. It should be noted that the number of nozzles 10 disposed, the spacing between the nozzles 10, the inclination angle, and the like are appropriately selected as necessary.

  In FIG. 6, four spray nozzles 10 are arranged in the tangential direction of the duct 5, but when this is done, water droplets sprayed from the spray nozzle 10 become a swirl flow FS and enter the air suction unit 5. Around and is evenly diffused. The number of nozzles 10 to be arranged, the arrangement interval, and the like are appropriately selected as necessary.

  In FIG. 7, four spray nozzles 10 are arranged in a cross shape in the center of the duct 5. With this arrangement, water droplets sprayed from the spray nozzle 10 adsorb smoke h while proceeding toward the inner wall 5 a of the duct 5. The number of nozzles 10 to be arranged, the arrangement interval, and the like are appropriately selected as necessary.

  In FIG. 8, a plurality of spray nozzles 10 are suspended in the upper half 5 h of the duct (air suction part) 5. When the nozzle 10 is arranged in this manner, water droplets sprayed from the nozzle 10 are adsorbed while knocking off the smoke H. The number of nozzles 10 to be arranged, the arrangement interval, and the like are appropriately selected as necessary.

  In FIG. 9, a duct (air suction part) 5 continuous to the horizontal foaming part 3 is formed vertically, and a plurality of spray nozzles 10 are arranged on the inlet side of the duct. In addition, 5T shows drainage. The number of nozzles 10 disposed, the spacing between the nozzles 10 and the like are appropriately selected as necessary.

  In FIG. 10, an axial spray nozzle 10 facing the air K and smoke H suction direction is provided in the duct 5. When spraying from the spray nozzle 10 in the direction opposite to the air suction direction, the water droplet F collides with the smoke H and can be adsorbed efficiently.

  In FIG. 11, a plurality of purification spray nozzles 10 </ b> A project from an upper wall 5 a of a duct (air suction part) 5 </ b> A having a square cross section. The nozzle 10A is a low-pressure nozzle, and the foam aqueous solution (water droplets) W sprayed from the nozzle 10A collides with the bottom wall 5b of the duct and becomes finer, so that mist-like water droplets can be obtained.

  In FIG. 12, a plurality of purification spray nozzles 10A are provided on the four sides of the duct 5A, and an obstacle, for example, a net-like object 30 is provided at the center of the duct 5A. When the low pressure nozzle 10A is arranged in this way, the foam aqueous solution W sprayed from the nozzle 10A collides with the obstacle 30 as water droplets. Therefore, since the water droplet is miniaturized, it becomes a mist and can have a particle size close to the particle size of the water droplet sprayed by the spray nozzle 10.

  In FIG. 13, the inside of the duct 5 </ b> A is partitioned in a lattice shape, and the low-pressure nozzle 10 is disposed in each partition chamber 10 s. When the nozzle 10A is arranged in this manner, the aqueous foam solution (water droplets) W sprayed from the low pressure nozzle 10A collides with the bottom of the partition chamber 10s and is made finer. The particle size can be close to the mist-like particle size.

It is a front view which shows 1st Example of this invention. It is a front view which shows 2nd Example of this invention. It is a front view which shows the other Example of this invention. FIG. 4 is a plan view of FIG. 3. It is a longitudinal cross-sectional view which shows the other Example of this invention. It is a top view which shows the other Example of this invention. It is a top view which shows the other Example of this invention. It is a top view which shows the other Example of this invention. It is a longitudinal cross-sectional view which shows the other Example of this invention. It is a longitudinal cross-sectional view which shows the other Example of this invention. It is a top view which shows the other Example of this invention. It is a top view which shows the other Example of this invention. It is a top view which shows the other Example of this invention.

Explanation of symbols

1 room 3 foaming part 5 air suction part 7 foaming net 9 radiation nozzle 10 purification spray nozzle 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, wherein a purification spray nozzle is provided inside the air suction part.   The high-expansion foam fire extinguishing equipment according to claim 1, wherein the purification spray nozzle is a spray nozzle for spraying water or an aqueous foam solution.   The high expansion foam fire extinguishing equipment according to claim 1, wherein the foam aqueous solution sprayed from a purification spray nozzle is collected at a lower portion of the air suction section, and the collected foam aqueous solution is supplied to the radiation nozzle. A foaming method for a high expansion foam fire extinguishing facility in which air in a discharge section is supplied to a foaming part, and an aqueous foam solution is discharged from a radiation nozzle in the foaming part to collide with a foaming net;
Water or an aqueous foam solution is sprayed into mist-like water droplets by a purification spray nozzle provided inside the air suction unit, and smoke in the suction air is adsorbed to the water 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.   The foaming method for a high expansion foam fire extinguishing equipment according to claim 4, wherein the foam aqueous solution sprayed from the purification spray nozzle is collected and reused as the foam aqueous solution of the radiation nozzle of the foaming part.

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