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A method for controlling spontaneous combustion of coal leftover in gob-side entry retaining gob

A technology of goaf and leftover coal, which is applied in the field of spontaneous combustion prevention and control of leftover coal in coal mine goaf, can solve problems such as difficult to accurately determine the spontaneous combustion area of ​​leftover coal in the goaf, and precise control of the spontaneous combustion area of ​​leftover coal in the goaf, etc. Achieve the effect of reducing air leakage

Active Publication Date: 2022-07-19
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

This treatment method has played a positive role in ensuring safe production in mines. However, due to the limitation of the location of the air leakage channel, it is difficult to accurately determine the spontaneous combustion area of ​​coal left in the goaf, and thus cannot effectively control the spontaneous combustion area of ​​coal left in the goaf

Method used

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Examples

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Effect test

Embodiment 1

[0059] Taking a coal mine in Inner Mongolia as an example, the 4107 fully mechanized working face being mined in this mine has a strike length of 3197 meters, an inclination length of 300 meters, and a coal thickness of 3.6 to 4.2 meters. The return airway of the working face adopts gob-side entry retention as the air inlet of the lower working face; the width and height of the 4107 air inlet are 5.6m and 3.6m respectively, and the width and height of the return airway are 5.2m and 3.6m respectively. The ventilation volume is 1600m 3 / min;

[0060] During the mining process, due to the long and wide tunnels of the working face, the wide range of goafs, poor ventilation quality and serious air leakage, the highest monitoring concentration of CO in the corners and return air tunnels exceeded 200ppm, and there was no downward trend, indicating that the goafs Oxidation of leftover coal is accelerated; the following steps are used to control spontaneous combustion of leftover coal...

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Abstract

The invention provides a method for controlling spontaneous combustion of coal leftover in a gob-side entry retaining gob, comprising the following steps: releasing tracer gas at the corner of an air inlet roadway to determine an air leakage channel; according to the air leakage channel, combined with coal mining work Use software to simulate and determine the high temperature area of ​​the goaf; use the infrared detection system to detect the radiation temperature field of the coal left in the goaf, and obtain the surface temperature distribution map of the goaf; use the acoustic wave test system to detect and analyze the goaf The sound wave information of the high temperature area in the surface temperature distribution map is used to determine the abnormal area inside the gob; the overlapping area of ​​the high temperature area in the gob and the abnormal area inside the gob is determined as the coal leftover in the gob retaining gob. Spontaneous combustion area; plugging the air leakage channel; drilling holes in the spontaneous combustion area of ​​coal left in the gob-retaining gob area, and pouring fire-extinguishing materials.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of spontaneous combustion of coal leftovers in gobs of coal mines, and particularly relates to a method for treating spontaneous combustion of coal leftovers in gobs of gobs. Background technique [0002] Gob-side entry retaining technology can maximize resource recovery and avoid coal loss, which has a significant effect on improving mine economic benefits. However, the side of the gob-side entry in the working face is prone to deformation under repeated pressure shocks. In addition, the "Y" type ventilation method is adopted. These factors increase the air leakage in the goaf and increase the risk of coal spontaneous combustion. At the same time, the roof of the goaf is integrated with the adjacent goaf, which makes the seepage law in the gob more complicated. These factors have a dynamic impact on the distribution of the oxidation zone in the gob. [0003] In order to control th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F5/00
CPCE21F5/00
Inventor 张雷林蒯多磊边云朋孙月吴文静舒森辉杨梦单
Owner ANHUI UNIV OF SCI & TECH
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