RU79944U1 - HEADER FOAM GENERATOR UNIT FOR PRODUCING COMBINED INERT FOAM - Google Patents

Abstract

(57) Use: A utility model of the system relates to fire fighting equipment, namely, devices for preparing combined gas-mechanical foam.

Purpose: Redistribution of the gas mixture flow along the periphery of the grid package while obtaining a stable structure of the combined foam after the grid package and achieving the efficiency of eliminating fires in mines.

SUBSTANCE: pressure head foam-generating installation for producing a combined inert foam, comprising a housing 18 with a pre-chamber 17, having a bottom with nozzles for forming an air flow and an nozzle 19 placed in the housing for supplying a foaming solution to the mesh packet 4, while in the confuser part of the installation housing 18, namely, in the mixing chamber after the foam cartridge, an additional cut-in pipe 6 is installed, equipped with a spray fogger to supply nitrogen-HFC mixture along the sleeve 7, made with zhektornym gas mixer 10, the suction refrigerant of the liquid, wherein as the jet gas is used nitrogen stream, and as a source of jet gas used underground power flow gasifier connected to the coupling head 14 of flow sleeve 15 of the pressure unit.

Positive effect: Increasing the efficiency of mining operations during the elimination of underground fires in mines.

Description

The utility model relates to fire fighting equipment, namely, devices for the preparation of gas-mechanical foam.

A foam generator comprising a housing with a prechamber, having a bottom with nozzles for forming an air flow and an nozzle located in the housing for supplying a foaming solution to the mesh bag. (Certificate. RF No. 19763, patent No. 47976 class. 7 E21F 5/04, 2000, 2005).

The disadvantage of the foam generator is a clear misallocation of the air flow to the periphery of the mesh packet, due to its active redistribution along the central part of the mesh packet, which is confirmed by bench and polygon tests of prototypes of “Ekran” pressure head foam generators of this type.

The purpose of the proposed technical solution of the utility model is that the design features of the foam generator (two mixing chambers) allow for uniform redistribution of the gas flow over the mesh cross section, which ensures the productivity and multiplicity of the foam, the operational reliability of the device depending on the redistribution of the gas flow (air, nitrogen, chladone, etc.) due to the intensification of the process of mixing the components of the mixture.

The essence of the proposed improved foam generator according to certificate. RF №19763 consists in the fact that in order to completely redistribute the combined gas stream over the cross-section of the perimeter of the nets, to improve the structure of the foam stream in the foam generator - the prototype, characterized by the fact that in the diffuser part of the body, namely, in the mixing chamber in front of the foam cartridge, an additional mortise nozzle equipped with a nitrogen nozzle

mixture along the sleeve, made with an ejector gas mixer, sucking the liquid in the form of freon, and nitrogen is used as a jet gas stream, and an underground gasifier is used as a power source for the gas stream.

The proposed set of distinctive features of the foam generator has useful properties, namely, the complete redistribution of the combined gas stream over the cross section of the packet of grids with the preliminary generation of the main structure in the mixing chamber of the gas product and the foaming agent solution before it is redistributed to the grid packet is achieved. This achieves the main advantages of the method and device on the proposed improved foam generator, which provides a foam multiplicity of more than 30% in terms of reducing the dropout (syneresis) of the liquid phase of the foaming agent. The package of foam-generating nets lasts 2 times longer due to the fact that the freon supplied to the second mixing chamber does not cause frostbite of the nets after the foam-generating cartridges.

Figure 1 shows a pressure head foam generator with a partial section.

Pressure foam generator for receiving combined inert foam contains the following items: 1-connecting flange for connection to the foam; 2-viewing window; 3-cartridge foam mesh; 4 - handle extracting foam cartridge; 5- fogger;

6-pipe; 7 - a sleeve of supply of a mixture of freon and nitrogen; 8- bottom of the prechamber; 9-pipe supply of compressed gas (air, nitrogen); 10-ejector gas mixer; 11 - a sleeve of supply of liquid freon; 12- filter; 13- crane; 14-connection head; 15- nitrogen gas supply hose; 16- fitting for connecting the sleeve of the blowing agent solution; 17- prechamber; 18- case in the form of a diffuser; 19-nozzle; 20- mixing chamber (nitrogen, freon); 21-confuser part of the body; 22 - flow meter.

In this case, the foam generator body has a lock channel, and the foam cartridge handle 4 for removing and changing to a new one

foam mesh. Foam generation control is provided directly through the inspection window.

Foam installation works as follows.

To inject foam under pressure through the main pipeline into the zone of elimination of an underground fire that has occurred, for example, in the worked-out part of a coal seam, to the existing pipeline for any purpose (air pipe, water pipe), a slurry pipe, a degassing pipe, a dry pipe, etc.) are connected using flange 1 a real foam generator system. A pipe is connected to the fittings 16 and 9, respectively, for connecting the supply of a foaming agent solution and compressed gas.

At the same time, in the confuser part 21 of the casing, in the mixing chamber 20 after the foam cassette 3, an additional cut-in pipe 6 is installed in the confuser part of the casing 6, equipped with a spray fogger 5 for supplying nitrogen-HFC mixture along the sleeve 7, made with an ejector gas mixer 10, sucking liquid in the form of freon, moreover, nitrogen is used as the jet gas, and an underground gasifier connected to the connecting head 14 off is used as the source of supply of the jet gas by nitrogen idnoy sleeve 15 of the pressure unit. The consumption of freon is determined by the flow meter 22.

Freon was launched to inhibit the flame and phlegmatize the gaseous medium from the mine workings and from the surface through wells drilled into the worked-out space at the site of the proposed fire site. After the use of chladones, there were no cases of repeated tanning and gas flashes (explosions).

The use of nitrogen for phlegmatization of the gaseous medium in the endogenous fire area allows the transfer of combustible gases of the mixture to the region of rich mixtures. This is achieved by diluting methane-air mixtures with nitrogen or displacing them. The combined use of chladones with nitrogen increases the extinguishing and phlegmatizing properties of chladones.

RosNIIGD and VNIIPO found that with a 5% dilution of air with nitrogen, the fire extinguishing efficiency of Freon 114 B2 increases. Based on these studies, a combined gas composition (freon + nitrogen) for volumetric quenching was proposed. A study was conducted on the effect of Freon 114 B2 on the ignition region of methane-hydrogen-air mixtures when 10, 20, 30% of air is replaced with nitrogen. It was found that when diluting the air with nitrogen for every 10%, the consumption of Freon 114 B2 decreases by about 2 times. Moreover, with a 30% replacement of air with nitrogen, the phlegmatizing concentration of 114 B2 freon is only 0.3%. The advantage of using a mixture of chladone with nitrogen over pure nitrogen is that the mechanism of phlegmatization of explosions and flame inhibition is based on the chemical inhibition of the combustion reaction, and not simply on the mechanical replacement of atmospheric oxygen by nitrogen. The use of a mixture of nitrogen with chladone can significantly reduce the consumption of both phlegmatizers, without compromising efficiency. The aerosol of Freon 114 B2 was delivered to the worked-out space at the Tyrganskaya mine of the Hydrogol Production Association and other mines of the Kuzbass.

During the operation of the foam generator, contrary to the dead zones along the periphery of the mesh packet, the present model of the foam generator ensures complete redistribution of the gas flow with the foaming solution already in the mixing chamber before the mesh packet with increasing foam structure directly on the mesh and further transportation to the extinguishing zone of the underground fire.

The proposed improvement of the foam generator, as shown by bench studies, ensures the range of transportation of the foam flow through the foam pipes, including and the elimination of underground fires in mines.

Claims (1)

A pressurized foam generator for producing a combined inert foam, comprising a housing with a prechamber having a bottom with nozzles for forming an air flow, and a nozzle for supplying a foaming solution to the mesh packet placed in the housing, characterized in that in the confuser part of the housing, namely the second chamber mixing after the foam cartridge installed an additional cut-in pipe equipped with a spray mist for feeding nitrogen-chladone mixture along the sleeve made with an ejector m gas mixer regulating suction refrigerant liquid as an aerosol, wherein as the gas source is a nitrogen gas, and as a source of jet gas flow supply is used underground mobile gasifier.