RU2636925C2 - Device for quenching and prevention of flammable fluids fluid - Google Patents

Abstract

FIELD: fire safety.

SUBSTANCE: invention can be used to prevent fires of flammable and easily ignitable liquids, as well as quenching in emergency straits and allows to increase the quenching efficiency. The design of the device is a container with tubes placed in it throughout the section. Each tube has a narrowing.

EFFECT: increase the effectiveness of quenching.

2 ex, 4 tbl, 2 dwg

Description

The invention relates to fire fighting equipment and can be used to prevent fires of flammable and flammable liquids, as well as extinguishing during emergency spills.

Closest to the proposed invention is (and.with. No. 1463317).

The design of the device is a container with tubes placed in it throughout the cross section. In this case, a reflector is installed in each tube.

A significant disadvantage of the device is that the manufacture of reflectors in each tube is difficult to manufacture, and reflectors also narrow the bore of the tubes, which reduces their throughput and efficiency.

The purpose of the invention is to increase the efficiency of extinguishing and metal consumption. In FIG. 1 shows the proposed device, side view, in FIG. 2 - the same, top view.

The device comprises a container 1, in which tubes 2 are located along its entire cross section, the axes of which are parallel to the walls of the container. On the perimeter of each tube, at a distance of H = 2-5 cm from the edge of the tube, there is a constriction 3. The diameter of the tube to the diameter of the constriction relates, as

where D - diameter of the tube, D _suzh. - the diameter of the narrowing.

All elements of the device are made of non-combustible material (in this case, sheet stainless steel X18H10T), which should have low thermal conductivity in order to minimize heat fluxes along the pipe walls into the liquid, as well as reduce the height of the heated layer of material.

In cross section, each pipe must have a shape that has central symmetry. In FIG. 1 shows pipes having a square section.

The cross-sectional shape in each case can be determined from structural and technological considerations.

The main factor ensuring the elimination of the gas-phase combustion of liquids is the creation of conditions that limit the naturally convective movement of the gas medium near the flame zone. Subject to the indicated relations between the sizes of the elements of the device and the physical parameters of the liquid, the heat and mass transfer conditions limiting for the combustion process are provided. The narrowing in the tubes will increase the rate of fluid outflow at the narrowing points, which will allow the combustion products (carbon dioxide) to be sucked into the combustible liquid, thereby preventing the combustion process.

This leads to a rapid decrease in the rate of supply of the oxidizing agent to the reaction zone and, accordingly, a decrease in the intensity of heat release. As a result, the combustion process stops.

Example 1

Tables 1 and 2 show the results of the combustion of alcohol and diesel fuel in channels without constriction at different temperatures of heating a combustible liquid.

Table 1 presents the results of a study of the combustion of ethyl alcohol in a vertical channel without constriction.

Table 2 presents the results of a study of the combustion of diesel fuel in a vertical channel without narrowing.

Example 2

Tables 3 and 4 show the results of the combustion of alcohol and diesel fuel in channels with narrowing at different temperatures of heating a combustible liquid (according to the proposed method).

Table 3 presents the results of a study of the combustion of ethyl alcohol in a narrowed vertical channel.

Table 4 presents the results of a study of the combustion of diesel fuel in a vertical channel with a narrowing.

It can be seen from the results that when burning in the channels without constriction at a distance of 2-5 cm from the edge, an increase in flame height occurs, which can lead to repeated ignition.

In examples where the channels are narrowed, the flame is extinguished gradually. The proposed design, i.e. with narrowing in the channel, prevents repeated sunbathing.

Claims (2)

A device for extinguishing and preventing the burning of flammable liquids, comprising a container with vertical tubes placed therein over the entire cross section, characterized in that the tubes have constrictions at a distance of 2-5 cm from the edge, while the diameter of the tube D corresponds to the narrowing diameter D of the _{constriction.} , as

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