RU1788288C - Device for fire and explosion protection of mines - Google Patents

Abstract

SUMMARY OF THE INVENTION: When an open flame occurs at a gas suction fan, the sensor supplies a control signal to an explosive machine, which provides a signal for detonating explosive charges. First, a low-explosive charge will explode and spray some of the products of an extinguishing agent explosion in the direction of the propagating flame through the openings in the housing. At the same time as the electric detonator, a blisant insert is triggered, which will undermine the main charge B B, ejecting another part

Description

The invention relates to the mining industry and can be used for fire and explosion protection of a mine using, to reduce the gas mobility of mining sites, which process high-gas-bearing coal seams, an isolated outlet of gas-air mixtures on the surface using gas exhaust fans.

The closest in technical execution to the claimed device is a device for the localization of explosions of gas and drink in gas pipelines. The device includes a pipeline in communication with one end with a gas suction well and the other with a gas suction fan, a fire and flame arrester installed inside the pipeline, and a valve for communication with the atmosphere located on the surface of the pipeline.

A significant disadvantage of the known device is that it does not meet the requirements for the reliability of fire-explosion protection and the extremely limited scope. The device is operable at relatively slow explosive ones (at an explosion propagation speed of up to 400 m / s and low pressures, it may not work, and at a speed of 1000-1200 m / s, an explosion may break through into a gas outlet well. open flame and explosive burning; The purpose of the invention is to increase the reliability of fire and explosion protection of the mine with continuous pulses of open flame and explosive burning.

The specified goal is achieved in that the device containing the pipeline, connected at one end with a gas suction

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a borehole, and another with a gas suction fan, a fire extinguisher installed inside the pipeline and a valve: for communication with the atmosphere, located on the surface of the pipeline, the fire extinguisher is designed as; a cylindrical body divided by two blasting inserts into two parts, in one of which, located on the side of the gas suction well, there is a vessel with a fire extinguishing agent and a low-voltage charge B B with an instant detonator and a cavity for mixing and cooling pro- is made. there are holes, and on the lateral surface of this part of the casing, holes are made along the entire circumference of the cross-section, and the outlet made at the end is covered by a membrane, and the main charge B V is placed in the other part of the casing located on the side of the gas-suction fan an electric detonator combined with a blasting insert and a flameless gas generator with a long-acting action, while the valve for communicating with the atmosphere is located in the pipeline section between the explosive isolator and the gas outlet yvayuschey borehole, -. /.: V-. ;.; .. ::,; -:; -. :,. - .. V In FIG; 1 shows a device arrangement in a gas suction pipe, side view; in FIG. 2 - device fire and explosion protection of the mine, a longitudinal section.

During the operation of the ground gas extraction complex of the mine (not shown separately in the figure), including the gas extraction fan 1, for example, VMTsG-7, the ground gas extraction pipe 2 and the gas extraction well 3, there is a need for fire and explosion protection. For this purpose, a fire and explosion protector 4 is installed in the gas suction pipe 2, consisting of a cylindrical body 5 with a front 6 and a back 7 parts. The housing 5 is fastened in the pipe 2 by means of fastening elements 8. Inside the front part 6 of the housing 5, a vessel 10c is located on the spacer elements 9 with extinguishing agent 11, for example, freon. Correspondingly, inside the vessel 10 there is a central blind channel 12, in which a low-power explosive (BB) charge is placed: 13 with an instant detonator (ED) 14. The outlet (pos. Not shown) of the front part 6 of the casing 5 is covered by a membrane 15 that can withstand the pressure of the explosive charge 13 and ED 14 Channel 12 from the side facing the rear 7 of the casing 5 is closed with a blasting insert 16. On the side surface of the front parts. 6 of the housing 5 along the entire circumference of the cross-section there are holes 17, the inclination of which is made to the side, where

a blast wave or flame may propagate. The space between the surface with openings 17 and the vessel 10 forms a mixing chamber. 18. The rear part 7 of the housing 5 from the side facing the front part b is blocked by the main charge of BB 19 with the EDKZ 20 aligned with the blasting insert 16. The remaining space of the rear part 7 of the housing 5 is filled with a flameless gas generator 21, along the axis

which has a hole 22 for outputting wires 23 from the ED 14 and EDKZ 20, which are connected to the explosive machine 24, generating the blast current when an open flame is detected by the sensor 25. On the side surface of the rear part 7 of the housing 5 along the entire circumference of the cross section holes 26, the inclination of which is made in the direction where the blast wave can propagate

or explosive combustion. To vent excess pressure in conduit 2. There is a valve 27,

The device operates as follows. .--, - ./. U--; -; ..; ... ..

If an open flame (fire, spark) occurs, which can occur only with the gas suction fan 1, for example, due to a broken blade), the sensor 25, for example, an LED, sends a control signal to the explosive machine 24. In turn, the machine 24 provides an electric signal with parameters sufficient to explode ED 14 and EDKZ 20. First (instantly) a small explosive charge 13 will explode, for example, irnite weighing 20-30 g and spray an hour of the products of the explosion and extinguishing agent, for example, Freon miscible in mixing chamber 18, e.g. spreading flame or explosive combustion through openings 17. When mixed with hot explosion products in chamber 18, the extinguishing agent (freon) evaporates, cooling the first and the extinguishing gas forming a flame. Membrane 15 at

it does not collapse. At the same time as ED 14, the blasting insert 16 is triggered, which after 100-300 ms will undermine the EDKZ 20 and the main charge of the BB 19, even if the EDKZ 20 does not work from the machine 24. At the same time, the slowdown of the EDKZ 20, as well as the insert 16, is assumed to be 100 -300 ms, the main charge of explosives 19, for example, an ion exchanger weighing 150 g, ejects another part (70-90%) of the gas extinguished in the chamber 18 into

gas suction line 2, destroying the membrane 15. At the same time, the explosion products of the explosive charge 19 ignite the flameless gas generator 21 for a long time (10-15 s), the low-temperature gas from the decomposition of which supports the previously created inert zone, which acts as a barrier. In this case, the low-temperature gas is also supplied in the direction of the possible occurrence of secondary sources of ignition through the openings 26. The overpressure that occurs after the explosion-proof flame arrester 4 has been triggered and seized by the back-up of the gas-air mixture coming from the mine opens the safety valve 27 on the pipeline 2. The fan 1 will short-circuit through the valve 27, which will prevent further intake of a gas-air mixture.

The proposed technical solution makes it possible to reliably explode a mine even with continuous (repeated) pulses of open fire and explosive burning.

Claims (1)

SUMMARY OF THE INVENTION A device for fire and explosion protection of mines, including a pipeline in communication with one end with a gas suction well and the other with a gas suction fan, a fire and explosion protector, installed inside the pipeline, and a valve for communication with the atmosphere, located on the surface of the pipeline, characterized in that, in order to increase the reliability of fire and explosion protection of the mine during continuous pulses of open fire and explosive burning, the fire and explosion protection device is made in the form of a cylindrical body, divided by two-piece insert into two parts , in one of which, located on the side of the gas suction well, there is a vessel with a fire extinguishing agent and a charge of low-explosive explosives with electric power Hur instant action and You are a polyene cavity for biasing and cooling the explosion products, and on the lateral surface of the body portion along the entire length of the cross-sectional circumference are provided with openings; and the outlet opening made at the end face is covered by a membrane, and in the other part of the housing located on the side of the gas suction fan, the main explosive charge with an electric detonator combined with a blasting insert and a flameless gas generator are placed, with a valve for communication with the atmosphere is located on the pipeline section between the fire and explosion suppressor and the gas stripping well.