SU1696734A1 - Device for mine fire/explosion protection - Google Patents

Abstract

The invention relates to mining promet and m. used for automatic fire explosion of gas wells and the mine as a whole. The purpose of the invention is to increase the fire protection efficiency by preventing the penetration of an open flame at the mouth of a gas suction well. The device contains a fan and a pipeline equipped with a butterfly valve, a bypass manifold and a flow chamber. Explosive concentration of methane is continuously maintained in the chamber. The invention relates to the mining industry and can be used to automatically protect the gas exhaust wells and the mine as a whole against the spread of open flame and explosive combustion in them. The purpose of the invention is to increase the fire-fighting efficiency of a mine by preventing the device from penetrating into the device, which automatically maintains the explosive concentration, which contains a methane sensor associated with the valves, a block of selective membranes to enrich the mixture coming from the fan to explosive concentration. When the gas is concentrated in the volume of the flow chamber and the well, the more explosive sensor generates a control signal to the valve and the mixture from the fan does not enter the diaphragms, but is emitted into the atmosphere. When an open flame appears in the exit part of the pipeline, it is transmitted through a flame to a wired tube into a flow chamber, where an amp & n explosion occurred. The blast wave rotates the valve and overlaps the cross section of the pipeline at the site in front of the outlet of the gas suction well. Explosion products phlegmatize the gas mixture in the bypass manifold. Overpressure is relieved through valves. The vacuum created by the fan rotates the damper to its original position. 2 Il. covered flame at the mouth of the gas suction wells. FIG. 1 shows a device for fire explosion protection of a mine during normal operation; in fig. 2 - the same, in emergency mode. The device includes a pipeline 1, connected by its inlet part 2 to the mouth of a gas suction well (not shown), with a VI co 4

Description

and the 3rd exit inlet of the gas-suction fan 4, for example, VMTSG-7. Between the inlet 2 and outlet 3 parts of the pipeline 1 are placed a bypass collector B and a chamber b, the first of which is larger than the second. The manifold 5 has safety valves 7. The flow chamber 6 has an inlet 8 and an outlet 9 of the surface. The inlet surface 8 is connected to the inlet part 2 of the pipeline 1, and the outlet 9 to the outlet part 3. A rotary valve 10 adjoins the outlet surface, installed with the possibility of blocking the inlet section 2 of the pipeline 1 at the interface between the pipeline and the collector 5 and the flow chamber b from the side of the well. The 8 m inlet outlet 9 surface is a flame arrester 11 and 12. The plow wire tube 13 is placed inside the outlet part 3 at the gas-suction fan 4 and communicates this part with the impregnation chamber 6. The flame arresters 11 and 12 are equipped with safety grids (not shown ) The internal volume 14 of the chamber 6 is connected to the output part 15 of the mechanism 16 for automatically maintaining an explosive gas concentration. The mechanism 16 includes a housing 17 with a selective membrane unit 18, a nozzle 19 connected to the atmosphere, and a nozzle 20 communicated with a diffuser (not shown) of the fan 4. The mechanism 16 also includes a methane sensor 21 installed in the internal volume 14 that controls the operation of the valve 22 and valve 23, communicating the internal volume 14 with the atmosphere. The mechanism 16 is protected from explosion by a valve 24 and a flame arrestor 25.

The device works as follows.

During normal operation of the gas-suction complex (Fig. 1), the gas-air mixture from the well due to the dilution created by the gas-suction fan 4 enters the inlet part 2 of pipeline 1, the main part of the gas-air mixture passes through the collector 5 and the smaller one goes through the inlet surface 8 and the inner volume 14 of chamber 6. Both parts, draining, flow into the output part 3 of pipeline 1. In the internal volume 14, explosive concentration (9% by volume) of methane is constantly automatically maintained due to its entry from the well. When the gas concentration in the volume of 14 and the well is less explosive, which is determined by the sensor 21, the first enriches the mixture by feeding the concentrated mixture obtained by passing

It is the first through the membranes 18 from the fan 4 through the pipe 20. At the same time, the lean mixture through the pipe 19 is emitted into the atmosphere.

When the gas concentration in the amount of 14 and

well, a larger explosive sensor 21 generates a control signal to valve 22, and the gas-air mixture does not additionally get from fan 4 to membrane 18, but is emitted into the atmosphere, and valve 23 opens, communicating internal volume 14 with atmosphere, and clean air, hit the chamber 6, dilutes the concentration in it to explosive. So

5, explosive gas concentration is constantly maintained in the flow chamber 6.

If a pipeline 1 or an open flame or an explosive burning in the output part 3 of the pipeline 1 occurs at a faster speed than in the bypass manifold 5, the pipe 13 is transferred due to the fact that it has a smaller diameter and extent. In the internal volume of 14, an explosion occurs. The explosive combustion is extinguished by fire suppressors 11, 12, and 25, and the inert products of the explosion are directed to the collector 5, to reflux the gas mixture in it. The blast wave closes the valve 24, protecting the mechanism 16, while the rotary valve 10 closes the inlet part 2 of the piping 1, the overpressure of the explosion in the bypass manifold 5 and the impregnation chamber 6 is released through the safety valves 7. The vacuum generated by the fan 4 rotates the valve 10 to its original position, and the mechanism 16 brings the concentration of gas in the collector 5 to explosive - the device dreams /, ready to

0 Explosion.

Claims (1)

Claims An apparatus for fire explosion protection of a shaft, including a fan and a pipeline with a device for blocking a pipeline cross section when exposed to a blast wave, is characterized in that, in order to increase the effectiveness of fire explosion protection of mines by preventing the penetration of an open flame at the mouth of a gas suction pipe well, the pipeline is equipped with a bypass manifold with safety valves installed between the fan and the gas suction well 5 valves, a flow chamber having flame arresters, an automatic maintenance mechanism in the flow chamber of an explosive gas concentration consisting of a methane sensor connected to the valves, and a block of selective membranes branch pipe and branch pipe section of the pipeline is made in for communication with the atmosphere, and a wire-shaped flame of a butterfly valve installed in tube that communicates the cavity of the flow passage interface of the pipeline with the flow meter with the outlet part of the pipeline, the receiving chamber and the bypass collector with This device for blocking the pro-5 side of the gas suction wells. Fig / - - / Ју АЛЛЛЙХ / «У / Л7 - - $ ZLSЈ n3fT L / 3u / i / fitrff Јf№