CN1517130A

CN1517130A - New foam fire extinguishing technique

Info

Publication number: CN1517130A
Application number: CNA031180213A
Authority: CN
Inventors: 君陈; 陈君
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-01-13
Filing date: 2003-01-13
Publication date: 2004-08-04

Abstract

A novel foam technique for extinguishing fire features that the compressed fire-extinguishing chemical gas (or inertial gas) is directly injected into the foaming liquid prepared from water and fire-extinguishing foaming agent, resulting in the generation of fire-extingushingg as foams to be sprayed on the burning object. When the foam is thermally broken, the water is evaporated to carry away part of heat and the chemical gas can play its fire-extinguishing role.

Description

New foam fire-fighting technology

Affiliated technical field: the foam fire-fighting technology is mainly used in the foam fire-fighting fire-fighting domain.

Background technology: international at present, domestic employed foam fire-fighting equipment, as: foam annihilator, sump pressure formula foam proportioning unit, foam fire-fighting train etc., generally all adopt the foam fire-fighting blowing agent to mix by a certain percentage with water, pass through mechanical foaming, form the air of certain multiple, sprinkling covers on the comburant, the fire extinguishing initial stage, after the air bubble expanded by heating fragmentation in the foam, moisture in the bubble has been taken away certain heat when the vaporization evaporation on the one hand, the air that overflows in the opposing party's papula mixes with combustible substance, forms burning more at a certain temperature, because constantly additional foam, make that burning decreases with former calory burning again, incremental continuous cooling makes burning not continue, and reaches cooling at last, the purpose of isolated fire extinguishing.

The shortcoming of this technology maximum:

1. because the air in the foam has combustion-supporting effect, make blow-off velocity slow, fire-fighting efficiency is low;

2. be air owing to what comprise in the foam, so cause resume combustion easily.

Summary of the invention: new foam fire-fighting technology is exactly at these shortcomings, the inhibition gas of compression or inert gas are directly injected foam solution (liquid that water and the blowing agent of putting out a fire mix by a certain percentage), make it to form inhibition gas or inert gas foam (general designation fire-suppressant gas foam), sprinkling covers on the comburant, the fire-suppressant gas foam is when expanded by heating is broken, moisture in the bubble has been taken away a part of heat when the vaporization evaporation on the one hand, fire-suppressant gas itself is also taken away a part of heat, gas again can chemistry or fire smothering on the other hand, last fire-suppressant gas foam makes comburant and atmospheric isolation, make foam fire-fighting speed and efficient improve greatly, and be not easy resume combustion.

Description of drawings: new foam fire-fighting technology is applied on the 4L stored-pressure type aero-mechanical foaming AFFF3% fire extinguisher, as long as foam solution carrier pipe top in fire extinguisher inside, be that 3 0.8mm gas injection holes are bored in power nitrogen reservoir pressure district, cancellation mechanical foaming device, just can realize new foam fire-fighting technology, as scheming: 1. cylindrical shell 2. valve bodies 3. woven hoses 4. gas injection holes 5. foam solutions 6. compressed nitrogens 7. nozzles 8. handles

The specific embodiment: 3 nitrogen hand-holes are bored on the foam solution carrier pipe top in fire extinguisher inside, valve 2 is opened when depressing fire-extinguisher handle 8, compressed nitrogen 6 provides power for foam solution 5 outputs on the one hand, inject compressed nitrogen by the foam solution of gas injection hole 4 in carrier pipe 3 on the other hand, make the foam solution in the course of conveying evenly mix with nitrogen, by nozzle 7 ejection back natural foamings, form the fire-suppressant gas foam coverage on comburant, reach the purpose of fire extinguishing.

New foam fire extinguishing technique 4L fire extinguisher is compared with former 4L stored-pressure type aero-mechanical foaming AFFF3% fire extinguisher:

1, extinguishing ability improves greatly, and the fire of the 10B that can go out is 5 times of same model;

2, blow-off velocity is fast, is not easy to cause resume combustion;

3, simple in structure, cost descends, foaming efficient height;

4, the go out ability of category-B fire is higher than the co-content dry powder extinguisher.

Same reason; this new foam fire-fighting technology is applied in sump pressure formula foam proportioning unit; on other foam fire-fighting equipments such as foam vehicle, inject environment protection chemical extinguishing chemicals such as trifluoro one iodomethane, heptafluoro-propane in foam solution, its extinguishing ability has further raising.

Claims

1, two principal characters of this new foam fire-fighting technology are:

What (one) comprise in the foam is inhibition gas or inert gas, rather than air that can be combustion-supporting;

(2) inhibition gas after will compressing or inert gas (or the inhibition gas after the compression or the liquid of inert gas), directly the injection liquid that can foam.

2, about " international at present; domestic employed foam fire-fighting equipment; as: foam annihilator; sump pressure formula foam proportioning unit; foam fire-fighting train etc.; generally all adopt the foam fire-fighting blowing agent to mix by a certain percentage with water, pass through mechanical foaming, form the air of certain multiple, sprinkling covers on the comburant, the fire extinguishing initial stage, after the air bag expanded by heating fragmentation in the foam, moisture in the bubble has been taken away certain heat when the vaporization evaporation on the one hand, the air that overflows in the opposing party's papula mixes with combustible substance, forms burning more at a certain temperature, because constantly additional foam, make that burning decreases with former calory burning again, incremental continuous cooling makes burning not continue, and reaches cooling at last, the purpose of isolated fire extinguishing " text description and similarly describe;

3, about " new foam fire-fighting technology be will compression inhibition gas or inert gas directly inject foam solution (liquid that water and fire extinguishing blowing agent mix by a certain percentage); make it to form inhibition gas or inert gas foam (general designation fire-suppressant gas foam); spray and cover on the comburant; the fire-suppressant gas foam is when expanded by heating is broken; the moisture in the bubble has been taken away a part of heat when vaporization is evaporated on the one hand; fire-suppressant gas itself is also taken away a part of heat, gas again can chemistry or fire smothering on the other hand, last fire-suppressant gas foam makes comburant and atmospheric isolation, make foam fire-fighting speed and efficient improve greatly, and be not easy resume combustion " text description and similarly describe;

4, new foam fire-fighting technology is applied on the stored-pressure type aero-mechanical foaming fire extinguisher, as long as foam solution carrier pipe top in fire extinguisher inside, be that several gas injection holes are bored in compressed nitrogen gas-reservoir district, cancellation mechanical foaming device is with regard to this method, structure or the similar method and the structure that can realize the purpose of new foam fire-fighting;

5, sump pressure formula foam proportioning unit, other fixed froth installation such as foam vehicle, with the inert gas after the compression, as: nitrogen, carbon dioxide etc., or the liquid of the fire-suppressant gas after the compression, as trifluoro one iodomethane, heptafluoro-propane, carbon dioxide etc., directly inject the liquid that can foam, after the pipeline ejection, form the method or the similar method of fire foam naturally.