Coal and gas fluidization co-mining system and method for low-permeability inclined coal seam

Abstract

According to the system, the outlet end of a liquid nitrogen conveying pipe in a liquid nitrogen circulation fatigue fracturing permeability increasing unit penetrates through a hole sealing plug I and then extends to the bottom, and the inlet end of a gas extraction pipe I penetrates through the hole sealing plug I and then stops at the top; a high-pressure jet device in the hydraulic fluidization mining and gas extraction unit is mounted at a hole sealing plug II, the high-pressure jet device is connected with the liquid outlet end of a high-pressure water conveying pipe, and the inlet end of a gas extraction pipe II penetrates through the hole sealing plug II and then stops at the top; the hydraulic fluidization transportation unit comprises a coal body fluidization transportation roadway and a coal body fluidization transportation pipe; the goaf paste filling unit comprises a paste pumping machine and a filling pipe. The method comprises the steps of roadway construction; coal seam drilling construction; liquid nitrogen cycle fatigue cracking permeability increasing and gas extraction are conducted; carrying out hydraulic fluidization mining and gas extraction; carrying out hydraulic fluidization transportation; and filling the goaf with paste. According to the system and the method, the fluidization co-mining operation of the coal and the gas in the low-permeability inclined coal seam can be efficiently realized.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a system and method for fluidized co-mining of coal and gas in an inclined coal seam with low air permeability. Background technique [0002] At present, the mining of coal mines in China is mainly in the mode of underground mining. Underground mining needs to excavate a series of tunnels from the ground to the ground. The production process is underground, and the natural conditions are relatively complicated. With the increase of mine mining depth, the complexity of coal mine geological conditions is also increasing. In the mining of deep coal resources, most of the coal seams are not horizontal, and most of them are inclined coal seams. For inclined coal seams, their geological conditions The complexity makes mining more difficult. When mining inclined coal seams, in order to effectively deal with the gas in outburst coal seams, it is necessary to excavate aux...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned problems in the prior art, the present invention provides a method for co-mining coal and gas in a low-permeability inclined coal seam. It is beneficial to reduce the mining cost, and can effectively improve the safety factor in the mining process; the method has simple operation steps, low implementation cost, high safety factor in the operation process, and can solve the problems of difficult gas drainage and gas drainage in the traditional mining of low-permeability inclined coal seam resources. The problems of large amount of roadway excavation, difficult process control, low resource recovery rate and high mining cost

Images