SU1430032A2 - Method of extinguishing a fire - Google Patents

Abstract

FIELD: fire protection. The purpose of the invention is to increase the efficiency of fire extinguishing by increasing the range of high-expansion foam supply. This goal is achieved by the fact that, according to the method of extinguishing a fire by putting a raised-multiplicity foam on the burning surface, increased multiplicity on a low-multiplicity carrier dispersion jet, the feed is carried out with a series of supporting streams, the onset of which is ejected onto the overlying streams set at the beginning of the mixing zone. 1 hp f-ly. 2 Il.

Description

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This invention relates to fireproof silt.

The purpose of the invention is to increase the efficiency of fire extinguishing by increasing the range of supply of high multiplicity foam to the nozhe hearth while preserving the extinguishing time, structure and fire resistance of the air-mechanical foam of increased multiplicity.

FIG. Figure 1 shows schematically the device, with the aid, of which the six-axis is the proposed method of extinguishing a fire; in fig. 2 - option for flammable liquids.

Fire extinguishing is carried out simultaneously by feeding streams of the foaming agent solution through spray nozzles 2-4 and generator 1 of high-expansion foam. In this case, the dispersed jets of the foaming agent solution are supplied under a jet of increased multiplicity foam coming out of the nozzle of a high-fold foam generator, so that the upper dispersed jet A is the carrier basis, i.e., the transport for unsurpassed multiplicity Queue B is a carrier base for jet A, and jet C is for jet B, etc. If necessary, the number of jets can be increased.

The feed distance, and it depends on the speed and multiplicity of the foam of the lower carrier jet, and the number of jets, and they are chosen based on ensuring that the structure of the higher fold foam is not destroyed when picked up by the carrier jet, is practically unlimited (within reasonable limits), which allows to deliver foam of any multiplicity for almost any distance.

In this case, based on the fact that carrier jet speeds should be chosen as high as possible, based on the condition that the foam structure is kept at a high multiplicity, as well as on ensuring the maximum effect on the minimum number of stems, the ejection that is formed to equalize the speed and pickup should not occur. before the mixing zone of the upstream carrier stream. Otherwise it will increase

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the growth and trajectory of the carrier stream, which will contribute to its own weight, which will have a negative effect on the delivery to the hearth of the fire rate and its structure. The ejection and pick-up behind the shift zone are not effective, since in this case the carrier and transported jets will already lose a significant part of their energy, which will negatively affect the delivery range.

The sections of the racks of the nozzles rashers 3 and 4 (Fig. 2) are installed at the beginning of the mixing zones, in addition to eliminating the early ejection effect, which makes it possible to realize the speed of the outgoing jets 3 and 4 and allows an increase in the feed distance.

When feeding a high foam into the fire zone, it retains its structure due to the fact that the dispersed jets that come first to the fire-hazardous surface cool it, creating favorable conditions; I spread the high foam foam that causes the final effect of the fire by isolating of burning liquid from an oxidizing agent.

Claims (2)

1. Fire extinguishing method, according to auth. St. No. 936933, which implies that a jet of high-multiplicity air-mechanical foam is supplied to the burning surface by ejecting it with a dispersed jet of foaming agent solution, characterized in that, in order to increase the efficiency of extinguishing, by ensuring an increased to the fire center, while preserving the time of extinguishing, the structure and fire resistance of the air-mechanical foam of increased multiplicity, additional ejection is performed by dispersed jets of the frother solution; E Nena the direction of movement of which is located in the mixing zone of the jet from the previous high expansion foam jet. 2. The method according to claim 1, characterized in that the dispersed jets of the foaming agent solution are placed at the beginning of the mixing zone with a stream of high-expansion foam. Blend zone Blend zone of a jet of a Szeni S from bout B with it Dstrumi B C FIG. 2