RU2411361C1 - Method of coal extraction by sublevel hydraulic winning with concurrent methane extraction - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: method includes coal bed extraction in sub-levels with the use of hydraulic mining and pressure tight bulkheads. First, sublevel drifts are put to the boarder of mine section, then, as far as the coal is extracted in the sublevel entry way there installed is portable pressure tight bulkhead with pipe and duct for the output of coal slurry and concurrent methane exhaustion from near-well bore area. Note that after sublevel working out methane exhaustion is continued from the ducts installed in pressure tight bulkheads.

EFFECT: complex and rational use of coal in subsurface resources ensured by concurrent methane extraction, reduction of coal prime cost, safe mining.

4 dwg

Description

The invention relates to the mining industry and can be used in the development of minerals.

Known sub-floor hydraulic breakdown with flexible overlap mounted in one plane for the development of steep formations with a capacity of 8 m (Kilyachkov A.P. Technology of mining. - M .: Nedra, 1985, p. 292-296).

The disadvantages of the technology are: the need to conduct a large amount of preparatory workings; hazardous working conditions due to the high volumes of methane emissions.

These shortcomings were partially eliminated in another way (Technological schemes for the development of coal seams of the Prokopyevsko-Kiselevskoye field systems of sub-floor hydraulic breakdown (PGO), Instructions for the safe use of technological schemes for the development of coal seams of the Prokopyevsko-Kiselevsky deposit systems of sub-floor hydroboarding (PGO), Aksenov G.I., Afanasyev I.V., Vorozhtsov S.V. et al. Prokopyevsk, 2006, p. 45-52).

The cleaning recess in the sub-floor is performed by a hydraulic monitor. The face and preparatory workings are ventilated using local ventilation fans. For safety of work the safety guard is used. After the chamber (insertion) is worked out and the rock is filled with a high-pressure stand, ventilation pipes, transport chutes for passing the pulp are shortened, the hydraulic monitor and the shield are moved to a distance of 6-8 m, and then the cycle of coal extraction is repeated.

Another method is also known (RF patent No. 2368783 for an invention. "A method for developing coal seams in borehole hydraulic production", claimed. 04/30/08). In this method, the cylindrical part of the sealed chamber is installed in a pre-drilled well. Then, pipes are inserted into it for supplying water to the hydraulic elevator and for issuing coal pulp to the surface, after which an airtight chamber with a pipe is attached to the cylindrical part of the sealed chamber, through which methane is sucked to consumers during mining of the coal seam.

Along with the advantages, this method has disadvantages:

- a large amount of preparatory work;

- low quality of coal mined;

- the high cost of coal.

The objective of the invention is to eliminate the above disadvantages of the prototype and thereby the creation of such a method of coal extraction, which will allow:

- integrated and rational use of coal in the bowels due to associated methane production;

- reduction in the cost of coal;

- safe mining.

The essence of the invention lies in the fact that in the method of coal extraction by sub-floor hydraulic blasting with associated methane extraction, including coal seam mining in sub-floors using hydraulic mining and pressurized bridges, first-floor drifts to the boundary of the extraction field are carried out, then, as coal is removed in the sub-floor bays, a portable a tight jumper with a pipe and pipe for the issuance of coal pulp from the bottom-hole zone and associated methane pumping, and after working off the sub-floor, methane pumping continues from branch pipes installed in capital tight jumpers.

The method is illustrated by drawings, where in Fig.1 shows a diagram of the development of the reservoir sub-floor hydraulic pump with associated methane production; figure 2 is a section aa in figure 1; figure 3 is a section bB in figure 1; figure 4 - section bb in figure 2; I, II, III stages of coal mining in the entry.

The method of coal extraction by sub-floor hydraulic breaking with associated methane production is as follows.

On the ventilation and discharge horizons, the formation is opened with cross-beams 1, 2, slope 3 is carried out, as well as ventilation 4 and pulp-discharge furnace 5. To the boundary of the excavation field, under-floor drifts 6, 7 are carried out. At the boundary of the excavation field, at a distance equal to the entry length, a hydraulic monitor 8 and a portable sealed jumper 9 with a plexiglass window 10 are installed to monitor the operation of the hydraulic monitor 8 and the pipe 11 for transporting the pulp to the pulp kiln 5. A split furnace 12 is carried out and the cleaning work begins with a return stroke from the sub-floor drift in the sub-floor 13 by sights 14 along the strike of the formation. After coal extraction in the entry 14, the portable sealed jumper 9 is transported for the extraction of coal in the new entry, the pipes intended for transporting the pulp 11, as well as the stakes of the ventilation pipes 15 and pipes 16 for supplying water to the hydraulic monitor 8 are reduced. The coal beaten off with a high-pressure water jet together with water enters the receiving tray 17 and then the pulp along with methane through the pipes 11 laid along the sub-floor drift 6 is transported to the slurry kiln 5. There, at the interface of the notch 18 and the sub-floor drift 6, the methane rises and vent horizon 20, and the pulp of pipes laid in pulpospusknoy furnace 6 is supplied to the haulage horizon 21.

After working off the sub-floor 13 in the serifs 14, capital sealed jumpers 22, 23 are installed with pipes for pumping methane from the worked out space. Fresh air for ventilation of the preparatory mine 7 and the sub-floor drift 6 is supplied through pipes 24 from the local ventilation fan 25 installed on the main horizon 21 and then through the pipe 15 to the bridge 9. The outgoing air stream from the preparatory excavations 6, 7 through furnaces 4, 5 and ramp 3 goes to the ventilation horizon 20.

Claims (1)

A method for extracting coal from a sub-floor hydraulic breakdown with associated methane extraction, including mining a coal seam in the sub-floors using hydraulic mining and tight bridges, characterized in that first they carry out sub-floor drifts to the boundary of the extraction field, then, as the coal is removed from the sub-floors, a portable tight jumper with a pipe is installed and a pipe for the issuance of coal pulp from the bottom-hole zone and associated methane pumping, moreover, after working off the sub-floor, methane pumping is continued from the pipes installed in nutrient tight jumpers.

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