RU2392440C1 - Method for removal of dust and gas from breakage heading in case of room-and-pillar development system - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to mining, in particular - to a method for removal of dust and gas from the breakage heading in case of room-and-pillar development system. It involves supply of fresh air to the bottomhole zone with a draught source generating a vortical circulation circuit. On the one side of the circuit one performs supply of fresh air while on the other side one performs removal of contaminated air from the bottomhole zone. The draught source is placed in the bottomhole zone. It creates the first circuit of circulation vortical motion and generates a directed air flow, contaminated with dust and gas, along the wall of the excavation opposed to the miners' workplaces. At the spot of the first vortical circulation circuit connection to the following vortical circuit a linkage is driven that connects the excavation wherein cleaning works are performed to the exhausted chamber. An additional draught source installed in the exhausted chamber may be equipped with an air duct.

EFFECT: method enables intensification of ventilation in an excavation wherein cleaning works are performed and miners are present and at the place of connection of vortical circulation circuits where occurs accumulation of dust and gas clouds which improves sanitary and hygienic conditions of mining workers labour.

2 cl, 1 dwg

Description

The invention relates to the mining industry and can be used for ventilation of dead-end mining.

There is a method of natural ventilation of a dead-end mining of long length due to circulating vortex movement (Krasnoshtein A.E., Faynburg G.Z. Diffusion-network methods for calculating the ventilation of mines and mines. / Ekaterinburg, 1992, chap. 7, para. 7.1, C .148-164, Fig. 7.8).

The disadvantage of this method is the insufficient intensification of ventilation along the entire length of the dead-end production.

Closest to the alleged invention is a method of venting a dead-end mining, including the removal of contaminated air from the bottomhole zone using a circular vortex movement. Air is removed from the bottomhole zone on one side of each circuit of the vortex circulation, and fresh air is received on the other side of each circuit of the vortex circulation. To intensify ventilation, a traction source is installed in one of the circulating vortex circuits (Patent No. 2064588 of the Russian Federation of July 27, 1996, bull. No. 21).

The disadvantage of this method is the lack of ventilation (accumulation of dust and gas clouds) in the mine at the junction of the circulation vortex circuits.

The technical result of the invention is to increase the efficiency of ventilation by removing the accumulation of dust and gas from the mine, which is being cleaned and miners are located.

The technical result is achieved by the fact that in the method of removing dust and gas from a treatment mine with a chamber-pillar mining system, which includes supplying clean air to the bottomhole zone with a traction source, creating a vortex circulation circuit, on one side of which there is a supply of clean air, and on the other side - removal of contaminated air from the bottom-hole zone, and in the bottom-hole zone a thrust source is placed, which creates the first circuit of the vortex circulation movement and forms a directed air flow, contaminated with dust and gas, along the wall of the mine working, opposite the workplaces of miners, while at the junction of the first circulation vortex circuit with the next vortex circuit there is a malfunction connecting the mine working in which the treatment is being carried out, with the spent chamber, where an additional source of traction is installed which can be equipped with an air duct.

At the junction of the first circulating vortex circuit with the next vortex circuit, a malfunction occurs, which connects the mining in which the treatment is being carried out, with the spent chamber, in which the cleaning work has already been completed, there is no mining equipment and there are no people. An additional source of traction installed in the exhaust chamber removes air contaminated by dust and gas through the exhaust air into the exhaust chamber and further to the excavation drift and along the ventilation openings to the ventilation shaft.

Fresh air enters the dead end mine, where treatment is being carried out, along the wall at which the miners' workplaces are located. The required air exchange and the intensity of ventilation is achieved by calculating and selecting sources of traction for working together in the first circulation vortex circuit, and additional in the exhaust chamber.

The mining equipment (combine harvester, loading bunker and self-propelled wagon) located in the first circulation vortex circuit acts as a longitudinal partition that minimizes the exchange of air contaminated by dust and gas with fresh flow in the area of miners' workplaces.

The essence of the invention is illustrated by the drawing, which shows the ventilation scheme of the treatment workings (bottom-hole zone, dead-end production).

In the drawing are indicated: 1 - excavation drift; 2 - fresh air; 3 - hardened air flow; 4 - miners jobs; 5 - failure; 6 - directional air flow with dust and gases (primary circuit); 7 - self-propelled wagon; 8 - hopper reloader; 9 - combine; 10 - source of traction; 11 - the mouth of the sewage treatment (dead end production); 12 - spent camera; 13 - an additional source of traction; 14 - duct.

The method is as follows.

Fresh air 2 enters the extraction drift 1 due to the main fan unit, which creates a mine depression.

When the traction source 10, located on the combine 9, is turned on, a directed air stream with dust and gases is formed (primary circuit) 6. This air stream is separated from the miners' workplaces 4 by mining equipment (combine 9, hopper-loader 8, self-propelled carriage 7). Under the influence of the auxiliary source of thrust 13 through fault 5, air flow contaminated with dust and gas from the first circuit 6 enters the exhaust chamber 12. Fresh air 2 enters from the mouth of the treatment plant 11 to fault 5. Part of the fresh air flows through the fault 5 the places of the miners 4 to the bottom, where gas and dust are taken out, and with the help of the draft source 10 the first circulating vortex circuit 6 is formed. Another part of the fresh air 2 together with the air stream containing dust and gas 6 enters the exhaust chamber 12 with an auxiliary power source 13. The thrust sboyka 5 and the waste chamber 12 is a mixture of fresh air contaminated with flux and its dilution to hygiene standards with a content of hazardous components below the established norms. From the exhaust chamber, the mixture of air flows 3 is removed to the extraction drift 1 either through the exhaust chamber 12 or through the duct 14.

Aerodynamic parameters of the thrust sources are calculated depending on mining conditions, gas content of the strata and used mining equipment. The auxiliary source of thrust 13 is located in the spent chamber 12 in a technologically convenient place and can be equipped with an air duct through which the contaminated air stream is removed to the extraction drift 1.

The feasibility of using the duct 14 and its length is determined by calculation based on the gas content of the layers and the parameters of the used mining equipment.

The methods for calculating the aerodynamic parameters of the thrust sources 10 and 13, the length of the circulation circuits 6 and the location of the fault 5 are the know-how of this invention.

The proposed method of removing dust and gas from the treatment workings is advisable to use when driving blind workings with combine complexes.

The proposed method allows to intensify ventilation in the mine at the junction of the circulation vortex circuits, where there is an accumulation of dust and gas clouds. In addition, the proposed method of ventilation allows you to get a social effect, which consists in improving the sanitary and hygienic working conditions of miners.

At the potash mine of the Verkhnekamsk deposit of potassium and magnesium salts, successful tests of the proposed method have been completed.

Claims (2)

1. A method of removing dust and gas from a sewage treatment plant with a chamber-and-pillar mining system, comprising supplying clean air to the bottomhole zone with a traction source creating a vortex circulation circuit, on one side of which pure air is supplied, and on the other side is the removal of contaminated air from bottom-hole zone, characterized in that in the bottom-hole zone a thrust source is placed, which creates the first circuit of the vortex circulation movement and forms a directed air flow contaminated by dust and gas m along the excavation walls opposite miners working places, while at the junction of the first circulation loop with the next vortex swirl tested sboyka circuit connecting mining, in which cleaning operations are conducted, with the waste chamber, wherein an additional driving source is set. 2. The method according to claim 1, characterized in that the additional traction source is provided with an air duct.