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High-efficiency pre-extraction and rapid outburst elimination method of multi-source gas in the process of re-mining and excavation of leftover coal in the middle seam

A technology for gas drainage and middle layer extraction, which is applied in the field of multi-source gas efficient pre-drainage and rapid outburst elimination, can solve problems such as unsafe coal leftover in the middle layer, improve gas extraction efficiency, reduce gas extraction cost, and eliminate outburst danger. Effect

Active Publication Date: 2022-07-05
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the unsafe problem when there are old empty areas in the upper and lower layers and the coal left in the middle layer is mined

Method used

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  • High-efficiency pre-extraction and rapid outburst elimination method of multi-source gas in the process of re-mining and excavation of leftover coal in the middle seam
  • High-efficiency pre-extraction and rapid outburst elimination method of multi-source gas in the process of re-mining and excavation of leftover coal in the middle seam
  • High-efficiency pre-extraction and rapid outburst elimination method of multi-source gas in the process of re-mining and excavation of leftover coal in the middle seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] with H 1 ≥D 1 , H 2 2 (do not consider the influence of the old open space in the upper layer on the roadway of the left coal seam in the middle), and P 2 , P 3 Take the case of ≥0.74MPa as an example to illustrate the implementation steps of drilling:

[0029] 1. At the drilling site (10), construct the upward through-layer drilling (7) to the upper-layer old void (12), and construct the downward through-layer drilling (8) to the lower-layer old void (13); Advance drilling (9) is constructed on the coal body in front of the working face; the boreholes are connected to gas pressure measuring instruments (15) respectively, and the gas pressures in the upper empty area, the left coal seam in the middle, and the lower empty area are measured as P, respectively. 1 , P 2 , P 3 ;

[0030] 2. The main drainage pipe (2) is arranged at the side of the return air lane (1), and the main drainage pipe is suspended on the side of the roadway away from the coal body;

[0031]...

Embodiment 2

[0036] with H 1 1 , H 2 ≥D 2 , and P 2 ≥0.74MPa>P 1 >P 3 Take this situation as an example to illustrate the implementation steps of drilling:

[0037] 1. At the drilling site (10), construct the upward through-layer drilling (7) to the upper-layer old void (12), and construct the downward through-layer drilling (8) to the lower-layer old void (13); Drilling ahead (9) is carried out on the coal body in front of the working face; the boreholes are respectively connected with gas pressure measuring instruments (15), and the gas pressures of the upper vacant area, the left coal seam in the middle and the lower vacant area are respectively measured as P 1 , P 2 , P 3 ;

[0038] 2. The main drainage pipe (2) is arranged at the side of the return air lane (1), and the main drainage pipe is suspended on the side of the roadway away from the coal body;

[0039] 3. In the return air lane (1), the excavation work faces the front coal body to construct advanced drilling holes (9...

Embodiment 3

[0046] with H 1 1 , H 2 ≥D 2 (do not consider the influence of the old open space in the lower layer on the roadway of the left coal seam in the middle), and P 1 ≥0.74MPa>P 2 Take this situation as an example to illustrate the implementation steps of drilling:

[0047] 1. At the drilling site (10), construct the upward through-layer drilling (7) to the upper-layer old void (12), and construct the downward through-layer drilling (8) to the lower-layer old void (13); Advance drilling (9) is constructed on the front coal mass of the working face; the boreholes are respectively connected to gas pressure measuring instruments (15), and the gas pressures of the upper vacant area, the left coal seam in the middle, and the lower vacant area are measured as P, respectively. 1 , P 2 , P 3 .

[0048] 2. The main drainage pipe (2) is arranged at the side of the return air lane (1), and the main drainage pipe is suspended on the side of the roadway away from the coal body;

[0049] 3...

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Abstract

The invention discloses a multi-source gas high-efficiency pre-draining and rapid outburst elimination method in the process of re-mining and excavation of leftover coal in the middle layer. Gap gas; first determine the maximum danger of the three types of gas sources in the upper and lower empty areas and the coal seam, and after reasonable extraction, the roadway left in the middle of the coal seam starts to excavate, and after a certain distance is excavated, the upper and lower empty areas are carried out again. And the gas pressure measurement of the residual coal in the middle seam, determine the most dangerous gas disaster source, and then carry out gas extraction, and then cycle the maximum risk determination of the three gas sources, gas extraction and roadway re-excavation work, until the entire coal seam roadway is excavated. Finish.

Description

technical field [0001] The invention relates to a multi-source gas efficient pre-extraction and quick outburst elimination method in the process of re-mining and excavation of leftover coal in the middle layer, and belongs to the technical field of gas extraction in the process of re-mining of left-over coal. Background technique [0002] Restricted by history and the level of mining technology, the recovery rate of coal mines in my country in the early days was 30%-35%, and the recovery rate of some small coal mines and township coal mines was only 10%-20%, resulting in a large amount of coal leftovers in my country. Research shows that the national recoverable reserves of legacy coal are about 40 billion tons, and the recoverable reserves of legacy coal with an initial recovery rate not higher than 20% reach 27.16 billion tons, accounting for 67.4% of all recoverable reserves of legacy coal, and the mining value is huge. In fact, there are a large number of residual mining...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B43/00E21B43/30
CPCE21F7/00E21B43/006E21B43/30
Inventor 李振杨鹏杨晓军方智龙赵嘉鹏范伟超张纯旺李文璞姜海纳
Owner TAIYUAN UNIV OF TECH
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