Method and system for recovering residual coal in bottom wall of top coal caving mining in inclined super thick seam

Abstract

The invention discloses a method and system for recovering residual coal in the footwall of top-coal caving mining in inclined ultra-thick coal seams. The method recovers the residual coal in the footwall of top-coal caving mining in inclined ultra-thick coal seams in different areas, and two adjacent areas are separated by The coal pillars are separated; the residual coal recovery method of the bottom wall of the inclined and extra-thick coal seam caving mining in each area is the same and includes steps: 1. Construction of the residual coal recovery system; 2. Residual coal recovery; the system includes a controller, through isolation The residual coal recovery area of ​​the footwall of the top-coal caving mining of multiple inclined and extra-thick coal seams separated by coal pillars, as well as the surface gas filling station and surface gas gathering station set on the ground. The steps of the method of the invention are easy to implement, can effectively recover the residual coal in the bottom wall during top-coal caving mining in inclined extra-thick coal seams, and the recovery rate of coal resources exceeds 60%.

Description

technical field [0001] The invention belongs to the technical field of residual coal recovery, and in particular relates to a method and a system for recovering residual coal from the footwall of top-coal caving mining in inclined extra-thick coal seams. Background technique [0002] There are a large number of extra-thick coal seams with an inclination angle of 45 degrees to 70 degrees in the Xinjiang region of my country, and the top-coal caving mining method is often used for mining such coal seams, such as figure 1 As shown, the ratio of extraction and release is generally around 1:10. When this method is used for mining, due to the characteristics of bulk flow, a large amount of triangular coal bodies along the strike remain after the coal seam footwall is excavated, resulting in a large loss of coal resources. Some scholars once proposed to recover coal by excavating rock roadways under the triangular coal body, but the cost is too high and the implementation is diffi...

AI Technical Summary

Problems solved by technology

When this method is used for mining, due to the characteristics of bulk flow, a large amount of triangular coal bodies along the strike remain after the coal seam footwall is excavated, resulting in the loss of a large amount of coal resources

Some scholars once proposed to recover coal by excavating rock roadways under the triangular coal body, but the cost is too high and the implementation is difficult

At present, there is no effective method to solve the problem of recovery of residual coal in the footwall during top-coal caving mining in inclined ultra-thick coal seams

Images