JP2008119168A - 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 a net 7 for foaming and radiation nozzles 9 and an air suction part 5 for supplying air in a discharge section 1 to the foaming part 3. The air suction part 5 is provided with a heater 10 for evaporating smoke. <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, in order to use external air, a duct is penetrated in the building, or a bubble generator is provided by making a hole in the partition wall, so that there is a problem such as high cost. is there.

  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 quality and quantity 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; A heating means for evaporating the smoke as fine particles is provided.

  The heating means of the present invention heats the smoke to 80 degrees C.

  The present invention provides a high-expansion foam fire extinguishing equipment that discharges an aqueous foam solution from a radiation nozzle and collides with a foaming net while supplying air from a discharge section sucked from an air suction unit to the foaming unit. A foaming method is characterized in that the air sucked into the air suction part is heated to a predetermined temperature and evaporated, and then the air is supplied to the foaming part.

  Since this invention was comprised as mentioned above, clean air is supplied to a foaming part. Therefore, since the reduction of the expansion ratio can be prevented, the expansion ratio as designed can be obtained, and the fire can be effectively extinguished.

  The inventors of the present invention have studied and experimented on the cause of the reduction in the expansion ratio of the high expansion foam fire extinguishing equipment, and found that the main cause is “smoke” which is liquid fine particles. This smoke is generated in the chamber (foam discharge section) by the occurrence of a fire, but floats in the room as liquid particulates, for example, particulates 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 above problem could be solved by supplying clean air from which smoke was removed to the foaming portion, and studied and experimented on the means and the like.
As a result, it has been found that a heating means for evaporating the smoke may be provided in the air suction part that supplies the air in the discharge section to the foaming part.
The present invention has been made based on the above findings.

An 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. This fire extinguishing equipment has, for example, a foaming ratio of 500, and includes a cylindrical foaming part 3 and an air suction part 5 that supplies air to the foaming part 3.

  A foaming net (net) 7 is stretched at the tip of the foaming portion 3, and a plurality of radiation nozzles 9 are provided at the center thereof. The radiating nozzle 9 is disposed to face the net 7 and 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 heating means for heating the smoke is provided therein.

  As this heating means, for example, a cubic heater 10 surrounded by a lattice surface as shown in FIG. 2 is used. However, the heating means is not necessarily limited to this. For example, the air flow direction (axial direction) Alternatively, a plurality of nichrome wires may be arranged in parallel in a direction (radial direction) orthogonal to the direction. Moreover, a heating means may be provided outside the air suction part 5 and heated from the outside.

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, the control panel activates the high expansion foam fire extinguishing equipment, so that the foam aqueous solution w is discharged from the radiation nozzle 9, and the foam aqueous solution w collides with the foaming net 7 and sucks air while being refined to foam. To do. Since this bubble falls toward the fire source and covers the fire source, suffocation fire extinguishing, cooling fire extinguishing and the like are performed.

  At this time, smoke H based on a fire is generated in the room 1, and this smoke H is sucked together with the indoor air K into the air suction unit 5. 10 is provided and heated to a predetermined temperature, for example, 80 degrees, or before and after that, the smoke that is liquid fine particles evaporates and changes to a gaseous state. Therefore, the foaming portion 3 does not contain liquid fine particles (smoke), or contains a very small amount of smoke, and since air K is supplied, a stable expansion ratio can be obtained. Can be extinguished efficiently.

  In addition, it has become clear from experiments that the expansion ratio decreases when the smoke temperature is lowered. Even from this point of view, heating the smoke is preferable for maintaining the expansion ratio.

It is a front view which shows the Example of this invention. It is a perspective view which shows a heater.

Explanation of symbols

1 room 3 foaming part 5 air suction part 7 foaming net 9 radiation nozzle 10 heater K air H smoke

Claims (3)

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 heating means for evaporating smoke that is liquid fine particles is provided in the air suction part.   The high-expansion foam fire-extinguishing equipment according to claim 1, wherein the heating means heats the smoke to 80 degrees C. This is a foaming method for a high expansion foam fire extinguishing equipment in which air in the discharge section sucked from the air suction part is supplied to the foaming part, and the foam aqueous solution is discharged from the radiation nozzle in the foaming part to collide with the foaming net. And
A method for foaming a high expansion foam fire extinguishing system, wherein the air sucked into the air suction part is heated to a predetermined temperature and evaporated, and then the air is supplied to the foaming part.

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