SU688645A1 - Arrangement for withdrawing explosion-hazardous gas mixture - Google Patents

Description

one

The invention relates to the field of mining and can be used to combat local accumulations of methane and other harmful gases.

A device for localizing an explosive gas mixture is known, which includes a temporary or permanent sealed jumper installed in an excavation {Ij.

The disadvantage of this device is the possibility of leakage of hazardous gases and the formation of explosive gas-air mixtures directly at the lintel.

A device for withdrawing an explosive gas mixture is known, including its gas-tight bulkhead and gas exhaust pipe with intake openings through which the suction of the explosive gas mixture from the secondary section 2 is approached.

However, such a device does not prevent the formation of an explosive gas-air mixture in front of the bridge and regulate its concentration in the outgoing jet.

The aim of the invention is to increase the efficiency and safety of venting an explosive gas mixture by adjusting its concentration in the outgoing jet.

This goal is achieved by the fact that the device is equipped with a displacement chamber, air and gas intake channels with intake openings and control valves, while the intake apertures of the gas intake channel are located in the lower part of the jumper from the carbonated space, the intake apertures of the inlet channel side, the opposite arrangement of the intake openings of the gas intake duct, the air intake and gas intake channels: are connected to the displacement chamber, which in turn is connected to The exhaust ports of the gas outlet pipe are located on the side opposite to the location of the intake ports of the gas intake duct, and the control valves are installed at the interface between the air and gas intake ducts with the mixing chamber.

FIG. 1 shows the proposed device, a cross-section; in fig. 2- location of intake channels in the cross section of mine workings.

The device for venting an explosive gas mixture consists of a gas-tight jumper 1, a gas-exhaust pipe 2 with intake ports 3, a mixing chamber 4, which by means of control valves 5 is connected to air intake and gas intake channels 6 and 7 with corresponding air intakes and gas intake holes 8 and 9 .

The device is installed in a mine workout 10.

The operation of the device is as follows.

In the degassing system of the shaft or the gas exhaust generation, a vacuum is created which is transmitted through the gas exhaust pipe 2 and the displacement chamber 4 to the air intake and gas intake channels 6 and 7. The mine air and possible gas leaks under the action of the pressure differential enter through the air intake ports 8 and the air intake channel 6 mixing chamber 4. At the same time, the gas-air mixture through the gas intake ports 9 through the gas intake channel 7 also enters the mixing chamber 4, where both gas stuffy stream are mixed. Using the control valves 5 installed at the interface between the intake and gas intake channels 6 and 7 with the mixing chamber 4, the flow area for each of the streams is changed, thereby adjusting the amount of incoming air through the intake channel 6 and the gas mixture through the gas intake channel 7. The adjustment is made on the basis of direct measurements of the concentration of methane in the mixing chamber 4. With a small influx of gas due to a bridge in the mixing chamber, a concentration of methane of at least 2-3% is maintained. The comparatively large gassing in the mixing chamber makes it rational to maintain a concentration of methane more than 20 Deregulation of the device begins with the fact that the control valve 5 of the intake channel 6 is fully opened, the valve of the gas intake channel 7 is fixed in the closed position, and then the valve 5 is gradually opened until until the methane concentration in the mixing chamber is stabilized. After. This successively reduces the bore holes in both control valves 5 and brings the concentration of methane in the mixing chamber to the required level with a steady flow of fresh mine air into the intake port 6.

The gas pipe can be made of wood, brick, reinforced concrete, hollow or filled

the spaces between the side walls of the porous material, etc. To prevent the accumulation of carbon dioxide in the weathered mine, the air intake channel 6 is installed at the roof of the excavation.

Installation of adjustable air and gas intake channels on both sides of the gas-tight jumper, respectively

in roofing and soil generation, it prevents the formation of explosive concentrations of methane or other harmful gases in the areas adjacent to unventilated mine workings with unlimited

concentration of methane to the ventilated openings of the mine network and control the concentration of the hazardous gas removed.

Claims (2)

Invention Formula A device for withdrawing an explosive gas mixture, comprising a gas-tight jumper and a gas-withdrawing pipeline with intake openings, characterized in that, in order to increase the efficiency and safety of the discharge of an explosive gas mixture by adjusting its concentration in the outgoing stream, the device is equipped with a mixing chamber, air and gas intake channels with intake ports and control valves, while the inlet ports of the gas inlet drip are located in the lower part of the jumper on the gas side, fence air intake port holes - at the top of the bridge on the side opposite to the location of the intake ports of the gas intake channel, the air and gas intake channels are connected to the chamber mixing, which in turn communicates with the intake openings of the gas outlet pipe, located on the side opposite to the location of the intake openings of the gas intake duct, and control valves are installed at the interface between the air and gas intake channels with the mixing chamber. Sources of information taken into consideration in the examination  Kravchenko V.P. Liquidation of accidents in coal mines. M., “Nedra, 1967, p. 110-113. 2. Methods of control and methods of dealing with local methane accumulations of haulage and ventilation drifts by means of ventilation. Makeevka-Donbass, 1966, p. 62 (prototype). 70 1 / U / UU / TUTU / TUT here TUTUT / - / L 777/77777/77777 / / 7 // U // U //// - //// Pui. Z