Application method of coal seam gas pressure exchange device based on compressed air system

Abstract

The coal seam gas pressure exchange device and method based on the compressed air system, the high pressure pneumatic pump and the water injection pump are placed in the space in front of the tunneling work of the coal seam; the tunneling working face is drilled with gas injection holes, and there are drainage holes drilled around the gas injection holes; the gas injection holes The inside of the exhaust hole is filled with a gas injection occluder, and the inside of the drainage hole is filled with a suction occluder; the compressed air pipeline is connected to the high-pressure pneumatic pump through the first ventilation pipe, and the high-pressure pneumatic pump is blocked to the gas injection through the second ventilation pipe. Inflate the gas storage chamber of the device; the water injection pump fills the water inlet of the gas injection occluder and the drainage occluder with high-pressure water through the water injection pipe; the gas drainage main road is connected with a gas drainage branch, and the gas drainage The branch extends into the drainage hole and is connected with the drainage plugging device, and the gas drainage branch extracts the gas displaced in the coal seam. The invention changes the traditional method of injecting carbon dioxide gas into the coal seam, and uses the mixed gas in the compressed air pipeline as the gas injection source; reduces mining cost, improves mining productivity, and is suitable for large-scale industrial applications.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas drainage, and in particular relates to a method for using a coal seam gas pressure exchange device based on a compressed air system. Background technique [0002] Gas injection gas exchange is an emerging production stimulation technology, the principle of which is to inject CO into coal seams. 2 and N 2 , and in turn with CH 4 Competitive adsorption reduces CH 4 Effective partial pressure can promote gas desorption, and the tensile stress generated by the injected gas can also lead to tensile failure of cracks, forming new cracks, increasing the gas permeability of the coal seam, thereby improving the recovery rate of coal bed methane. [0003] In the prior art, usually by injecting high-pressure (5.5-8MPa) CO into the coal seam 2 pressure exchange for coalbed methane, but due to CO 2 High cost, low production capacity, reduced coal permeability after injection into the coal seam, and ...

AI Technical Summary

Problems solved by technology

[0007] Therefore, the present invention provides a method of using a coal seam gas pressure exchange device based on a compressed air system, which solves the problems of high cost and low production capacity of traditional carbon dioxide gas pressure exchange for coal seam gas, and at the same time solves the irreversible problem of traditional hole sealing

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