JP2008136541A - Fire extinguishing equipment with highly expandable foam and method of foaming thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent reduction of the foaming ratio related to fire extinguishing equipment with highly expandable foam and a method of foaming of the equipment used for a pit in an oil tank, a culvert in a petrochemical complex, or in a cabin or hold, etc. <P>SOLUTION: The fire extinguishing equipment with highly expandable foam comprises a foam generating part 3 with an emission nozzle 9 and an air intake part 5 for feeding air in an emission section to the foam generating part 3. The air intake part 5 has a steam generating means with a nichrome wire 14 and a spray nozzle 16 or a steam nozzle N connected to a steam pipe 10. <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 foam) fire extinguishing equipment.

  In both the fire extinguishing equipments, the foaming ratio is different, for example, the foaming ratio of the low foaming fire extinguishing equipment is 20 or less, and the foaming ratio of the high expansion foam fire extinguishing equipment 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 reason why the expansion ratio is lowered 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; Means or water vapor supply means is provided.

  The water vapor generating means of the present invention comprises a spray nozzle and a heater for evaporating water droplets discharged from the spray nozzle. The water vapor supply means of the present invention includes a steam nozzle continuous with the steam pipe.

  The present invention relates to a foaming method for a high expansion foam fire extinguishing equipment that discharges an aqueous foam solution from a radiation nozzle in the foaming part and collides with a foaming net while supplying air from the discharge section to the foaming part; The air sucked into the air sucking part is brought into contact with water vapor and then supplied to the foaming part.

  Since the present invention is configured as described above, smoke in the air sucked into the air suction portion is removed, and clean air is supplied to the foaming portion. For this reason, it is possible to prevent a reduction in the expansion ratio, so that 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 (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 1 μm or less. 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 above problem could be solved by supplying clean air from which smoke was removed to the foaming portion, and studied and experimented on its means.
As a result, it has been found that a water vapor generating unit or a water vapor supplying unit may be provided in the air suction unit that supplies the air in the discharge section to the foaming unit. This water vapor has the characteristics that the particle diameter is the smallest among the water droplets and the surface area is large. Therefore, when the smoke particles are adsorbed to the water vapor, the air can be efficiently cleaned. 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 radiations that are opposed to the net 7 at an interval are provided therein. A nozzle 9 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 steam nozzle N is provided therein. The steam nozzle N is connected to, for example, a steam pipe 10 in the factory. The flow rate of the steam nozzle N is appropriately controlled by a control panel (not shown).

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 room air from the air suction part 5, that is, the air K in the nearby room (release section) where the air suction part 5 is disposed, While being sucked, the aqueous foam solution w is discharged from the radiating nozzle 9 in the form of water droplets. The water droplets collide with the foaming net 7 and draw in air while being refined to foam. Although this bubble 12 is a highly expanded bubble, it falls toward the fire source and covers the fire source, so that the fire source is suffocated, cooled and extinguished.

  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. The suction part 5 has a steam nozzle. Since the water vapor S is ejected from N, the smoke that is liquid fine particles is adsorbed by the water vapor S. Therefore, air that does not contain smoke or air that contains a very small amount of smoke, that is, clean air K is supplied to the foaming unit 3. Therefore, since the expansion ratio as designed can be obtained, the fire can be extinguished efficiently.

A second embodiment of the present invention will be described with reference to FIG.
The difference between this embodiment and the first embodiment is that instead of supplying water vapor to the air suction portion, water vapor is generated in the air suction portion.
In this embodiment, the air suction unit 5 is provided with water vapor generating means, and as this water vapor generating means, a heater, for example, a nichrome wire 14 and a spray nozzle 16 are used.

  When water m is sprayed from the spray nozzle 16 in a state where the inside of the air suction unit 5 is heated to a predetermined temperature by the nichrome wire 14, the water m evaporates into water vapor, but the suction air passing through the air suction unit 5 Contacts the water vapor and adsorbs smoke particles. At this time, since the inside of the air suction part 5 is heated by the nichrome wire 14 and has a high temperature, the smoke particles are easily evaporated and are in a state of being easily moved. Therefore, the air cleaning efficiency can be improved.

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 steam pipe 14 nichrome wire 16 spray nozzle K air H smoke S water vapor

Claims (4)

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 steam generation means or a steam supply means is provided in the air suction part.   The high-expansion foam fire extinguishing system according to claim 1, wherein the water vapor generating means includes a spray nozzle and a heater for evaporating water droplets discharged from the spray nozzle.   The high-expansion foam fire extinguishing equipment according to claim 1, wherein the water vapor supply means includes a steam nozzle continuous with a steam pipe. 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;
A method for foaming a high expansion foam fire extinguishing facility, wherein the air sucked into the air suction part is brought into contact with water vapor and then supplied to the foaming part.

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