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Method for draining gas of mining layer of mine

A gas drainage and mining layer technology, which is applied in the fields of gas discharge, mining equipment, earthwork drilling, etc., can solve the problem of not exceeding the limit of gas gushing, and achieve the effect of improving the gas drainage rate and increasing the gas permeability coefficient.

Active Publication Date: 2014-11-05
SCI & TECH RES OF SHANXICOAL TRANSPORTATION & SALES GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies and defects of the prior art, on the basis of the existing gas drainage process that is easy to drain or can be drained in the mining layer, to provide a gas pumping method for the mining layer of the mine under the action of a pulsed high-voltage electric field. In this way, the gas gushing out of the working face in the mining layer will not exceed the limit, and the problem of gas drainage in this part of the mining layer will be effectively solved.

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  • Method for draining gas of mining layer of mine
  • Method for draining gas of mining layer of mine

Examples

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Effect test

Embodiment 1

[0020] Such as figure 1 , 2 As shown, a mine 2 # The gas in the coal seam working face mainly comes from mining layer 1, which is a coal seam that is difficult to drain. Originally, the coal seam gas drainage was mainly used, and goaf drainage was supplemented, and the pre-drainage was combined with extraction while mining. Arrange cross-drilled high-negative-pressure drainage along the air return trough of the mining face. The vertical drilling 2 for gas drainage has a hole height of 1.5m, and the oblique cross-drilled hole 3 for gas drainage has a height of 1.8m. The drilling depth is 90m, the actual drainage rate is 20%. On this basis, adopting the method of the present invention to carry out the gas drainage of the working face of the mining layer, the steps are:

[0021] I. In 2 # Iron insulated electrodes 4 are arranged in the gas drainage vertical boreholes 2 and gas drainage oblique cross boreholes 3 of the coal mining layer 1. The iron insulated electrodes 4 have...

Embodiment 2

[0026] A mine 15 # The gas in the coal seam mining face mainly comes from mining layer 1, which is a coal seam that is difficult to drain. Originally, the coal seam gas drainage was mainly used, and the gob drainage was supplemented, and the pre-drainage was combined with extraction while mining and extraction while digging. Arrange cross-drilled high-negative-pressure drainage in the return air trough of the mining face. Vertical drilling 2 for gas drainage is located 1.4m away from the bottom plate. The hole depth is 170m, and the drainage effect is poor. according to figure 1 The shown arrangement of pulsed high-voltage electric field for gas drainage in the mining layer drains the gas in the mining layer. The output power of the intrinsically safe pulsed high-voltage power supply is 1000kW, and the output voltages are 660V, 1000V, 1600V, 7800V, 12kV, 20kV and 40kV. , the actual drainage effect is good, and the drainage rate is increased by 23%. Others are with embodime...

Embodiment 3

[0028] A mine 3 # The coal seam is a high-gas coal seam, and the roadway is excavated in a single lane. Vertical drilling 2 for gas drainage and oblique cross drilling 3 for gas drainage are arranged in the stepping drill field 9 where two sides of roadway 8 are excavated at the front of the excavation working face and behind the front of the excavation working face. The lengths of the drilling holes are 130 m and 150 m respectively. , the actual pumping effect is not good. according to image 3 The shown arrangement of pulsed high-voltage electric field for gas drainage in the mining layer is used to drain the gas in the excavation face. The iron insulated electrode 4 has a diameter of 16mm and a length of 130m and 150m respectively. The actual drainage effect is good, and the drainage rate Increased by 21%. Others are with embodiment 1.

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Abstract

The invention provides a method for draining gas of a mining layer of mine, belonging to the technical field of gas drainage of coal measure strata. The method for draining the gas of the mining layer of the mine is characterized in that on the basis of the existing gas drainage technology capable of draining easily or draining the gas of the mining layer, iron insulated electrodes are arranged in perpendicular drill holes and obliquely-intersected drill holes, for the gas drainage of the mining layer; a terminal of an intrinsic safety type pulsed high voltage power supply source is connected with the iron insulated electrodes; the other terminal of the intrinsic safety type pulsed high voltage power supply source is grounded; and according to the gas emission of the mine layer, pulse high voltage electric fields with various powers are applied. According to the method for draining the gas of the mining layer of the mine, the pulsed high voltage electric fields are used for the gas drainage, so that the problem of difficult gas drainage of the mining layer is solved; the action of the pulsed high voltage electric fields can cause the adsorption ability of the gas of the mining layer to be decreased, so that the free gas of a coal body is increased; effective seepage paths for the gas of the coal body of the mining layer can be increased, so that the permeability coefficient of the coal body is increased; and therefore, with the adoption of the drainage method provided by the invention, the gas drainage rate can be improved; and for the mining layer of which the gas is more difficult to drain, the drainage rate can be up to 15% to 30%.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal-measure formations, and in particular relates to a method for gas drainage in mine mining layers under the action of a pulsed high-voltage electric field. Background technique [0002] Gas drainage or extraction is currently the main method to solve the problem of mine gas gushing out of limit. In the process of coal seam mining, for the excavation working face with large amount of gas emission, the method of excavating while excavating or pumping first and then excavating is used to drain the gas; for the mining face which is easy to drain or can be drained, Drain gas in advance by adopting bedding, penetrating and intersecting drilling methods; for recovery working faces in production layers that are difficult to drain, adopt intensive bedding drilling, dense grid penetrating drilling, hydraulic slotting, and hydraulic fracturing , Loose blasting, deep hole pre-splitting blasting a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00
Inventor 王东李风珍贾存华孙春伟郑铜镖朱跃琴
Owner SCI & TECH RES OF SHANXICOAL TRANSPORTATION & SALES GROUP
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