A coal spontaneous combustion monitoring method in Shimen sealed area of ​​coal layered mining

Abstract

The invention discloses a monitoring method for coal spontaneous combustion in Shimen airtight area of ​​coal stratified mining, which belongs to the technical field of coal mine security, including measuring the critical temperature of CO produced by coal body in Shimen airtight area and the environmental pH value of Shimen airtight area, selecting monitoring compounds, Steps such as arranging the monitoring area and coal spontaneous combustion monitoring in the closed area of ​​Shimen. In the present invention, a monitoring compound that can be decomposed to produce non-air component gas is arranged in the closed area of ​​Shimen during the low-temperature oxidation period of the coal seam. The gas generated by the decomposition of the monitoring compound is used as an indicator gas for coal oxidation in the low-temperature oxidation period. Determine whether there is a risk of spontaneous combustion in the coal body in the goaf outside the Shimen airtight area, realize early warning, and control and extinguish the small fire in time, curb the spontaneous combustion of coal, avoid the occurrence of spontaneous combustion accidents, and reduce safety It is especially suitable for fire monitoring in the unattended Shimen closed area where extra-thick and inclined coal seams are mined in layers.

Description

technical field [0001] The invention relates to a method for monitoring coal spontaneous combustion, in particular to a monitoring method for coal spontaneous combustion in a closed area of ​​Shimen during layered mining of an extra-thick inclined coal seam, and belongs to the technical field of coal mine security. Background technique [0002] The Shimen in the coal mine is on both sides of a main transportation roadway, with connecting roadways leading to the mining area, the track going up and down the mountain, and the transportation yard. It is usually excavated in the rock formation, not directly connected to the ground, and perpendicular to the coal seam or Diagonal rock alley. [0003] Because the inclined coal seam usually has the characteristics of complex structure, many faults and folds, and the roof pressure of the inclined coal seam has a component force acting vertically on the support or coal pillar and a component force along the inclined direction due to th...

AI Technical Summary

Problems solved by technology

Due to the particularity of this process, when the second layer is mined, the change of mining stress will cause a large disturbance to the Shimen coal seam 8 of the previous layer, which will easily cause cracks in the Shimen coal seam 8 of the previous layer and cause the Shimen to be sealed. In the case of air leakage in the area and heat accumulation in the coal seam, it is very easy for coal to spontaneously ignite, which in turn leads to spontaneous combustion accidents

However, due to the construction of the airtight wall 6, it is impossible to visually detect the spontaneous combustion of coal in the Shimen airtight area. Usually, it is discovered after the spontaneous combustion accident has occurred and extinguished through the pre-embedded grouting pipeline. This post-processing method will not only cause Waste of resources, and there is a great security risk

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