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Method for extracting gas at corner on recovery working face in coal mine

A technology for mining face and gas drainage, which can be used in gas emission, mining equipment, earth-moving drilling, etc., and can solve problems such as low drainage rate

Active Publication Date: 2012-06-27
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] This gas drainage method has a low drainage rate, and the extracted concentration is usually only 10-25%.

Method used

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  • Method for extracting gas at corner on recovery working face in coal mine
  • Method for extracting gas at corner on recovery working face in coal mine
  • Method for extracting gas at corner on recovery working face in coal mine

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Embodiment Construction

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The specific implementation process of the gas drainage method at the upper corner of the coal mine mining face of the present invention is as follows: figure 1 shown, including the following steps:

[0029] Step 101: Determine the range of the fracture zone according to the lithology of the coal seam roof in the coal mining face and the distribution law of the "upper three zones".

[0030] The "upper three zones" in this step refer to the "caving zone", "fissure zone" and "curved subsidence zone" which are usually referred to from bottom to top.

[0031] Step 102: Calculate the optimal extraction range in the direction according to the "O" ring theory of mining fractures and parameters such as the roof spanning angle of the coal seam.

[0032] Both the method for determining the range of the fractured zone in step 101 and the method f...

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Abstract

The invention discloses a method for extracting gas at a corner on a recovery working face in a coal mine, which comprises the steps of: A, predetermining the optimal extraction range and distance of drill sites; B, arranging the drill sites according to the distances of the drill sites; C, drilling a main drill hole upward from the top of each drill site toward a worked out section obliquely, wherein the main drill hole reaches a cracked zone from a caving zone; D, in the cracked zone, drilling a plurality of branch drill holes upwards from each main drill hole toward the worked out section obliquely, wherein the branch drill holes of each main drill hole are arranged in a fan shape in the optimal extraction range; and E, connecting the branch drill holes with extraction pipelines for extracting gas. By applying the method provided by the invention, when the mining work surface is advanced to the hole bottom, as the roof of a coal seam is carved automatically, the gas in the coal seam moves upward and adjacent coal seam is affected by the mining to release the pressure. The gas with pressure released moves toward a mined bed. Due to extraction negative pressure of the drill hole, the moving direction of gas is changed so that the gas is extracted to the extraction pipeline so as to reduce the gas amount pouring upward at the corner.

Description

technical field [0001] The invention relates to the technical field of coal mining in coal mines, in particular to a method for draining gas from an upper corner of a coal mining working face. Background technique [0002] At present, the goaf in the process of coal mining is behind the coal mining face, which always exists in the working face mining project and gradually increases in scope as the mining face advances. Gas gushing out of gobs accounts for a considerable proportion of mine gas sources. This is due to the fact that when mining coal in gas mines, especially under the conditions of mining coal seam groups and thick coal seams, the gas in adjacent coal seams, unmined layers, surrounding rocks, coal pillars and coal in the working face will gushes out to the goaf. As a result, a large amount of high-concentration gas has accumulated in the goaf. [0003] Since the goaf is connected with the ventilation network, the gas from the above-mentioned aspects flows into...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 杨俊哲贺安民陈殿赋安世岗薛夏民黄步青周成军秦波涛张雷林
Owner CHINA SHENHUA ENERGY CO LTD
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