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Method for treating spontaneous combustion of residual coal in gob-side entry retaining goaf

A technology of goaf and coal leftover is applied in the field of prevention and control of spontaneous combustion of coal leftover in goaf areas of coal mines, and can solve the problems of difficulty in accurately determining the spontaneous combustion area of ​​coal leftover in goaf areas, and precise treatment of areas where coal leftover coal in goafs cannot be accurately controlled. To achieve the effect of reducing air leakage

Active Publication Date: 2021-04-23
ANHUI UNIV OF SCI & TECH
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AI Technical Summary

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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Embodiment 1

[0059] Taking a coal mine in Inner Mongolia as an example, the 4107 fully mechanized mining 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 the gobside retaining alley as the air intake lane of the working face in the lower section; The ventilation rate is 1600m 3 / min;

[0060] During the mining process, due to the long working face roadway, large width, wide range of goaf, poor ventilation quality, and serious air leakage, the highest monitored concentration of CO in the corner and return airway exceeds 200ppm, and there is no downward trend, indicating that the goaf There is an accelerated phenomenon of coal oxidation; the method of controlling the spontaneous combustion of coal left in the gob-side goaf retaining goaf adopts the following steps:

[0061] (1) Infrared scanning is carried out on the gob-side entry with an infrared t...

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Abstract

The invention provides a method for treating spontaneous combustion of residual coal in a gob-side entry retaining goaf. The method comprises the following steps that tracer gas is released at the corner of an air inlet roadway, and an air leakage channel is determined; according to the air leakage channel, in combination with the general situation of a coal face, software is adopted for simulation, and a high-temperature area of the goaf is determined; an infrared detection system is adopted for detecting a radiation temperature field of the residual coal in the goaf, and a surface temperature distribution diagram of the goaf is obtained; a sound wave testing system is adopted for detecting and analyzing sound wave information within the range of the high-temperature area in the surface temperature distribution diagram of the goaf, and an abnormal area in the goaf is determined; the overlapping area of the high-temperature area of the goaf and the abnormal area in the goaf is determined as a spontaneous combustion area of the residual coal in the gob-side entry retaining goaf; the air leakage channel is subjected to leakage stoppage; and the spontaneous combustion area of the residual coal in the gob-side entry retaining goaf is subjected to construction drilling, and a fire extinguishing material is poured.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of spontaneous combustion of leftover coal in goafs of coal mines, and in particular relates to a method for controlling spontaneous combustion of leftover coals in goafs retained along goafs. Background technique [0002] Gobside entry retention technology can maximize the recovery of resources, avoid coal loss, and has a significant effect on improving mine economic benefits. However, the side of the gob-side of the working face is prone to deformation under repeated pressure impacts. In addition, the "Y"-shaped ventilation method is adopted. These factors increase the air leakage in the goaf and aggravate the risk of coal spontaneous combustion. At the same time, the connection of the goaf roof with the adjacent goaf makes the seepage law in the goaf more complicated. These factors have a dynamic impact on the distribution of the goaf oxidation zone. [0003] In order to control...

Claims

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Application Information

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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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