Device and method for rapid outburst elimination of frozen coal body injected with liquid nitrogen into bedding drilling for secondary utilization

Abstract

A device for quickly eliminating outburst by injecting liquid nitrogen to freeze coal through bedding drill holes twice comprises a liquid nitrogen machine, a liquid nitrogen storage tank, a liquid nitrogen injection machine, a temperature indicator, the first bedding drill hole, the second bedding drill hole, the third bedding drill hole, the fourth bedding drill hole, the fifth bedding drill hole and the sixth bedding drill hole, wherein the first bedding drill hole, the second bedding drill hole, the third bedding drill hole, the fourth bedding drill hole, the fifth bedding drill hole and the sixth bedding drill hole are arranged in sequence from left to right along the inside of a coal layer of regional substandard validation, and wheels are arranged on the bottom of the liquid nitrogen storage tank. The device for quickly eliminating outburst by injecting liquid nitrogen to freeze coal through bedding drill holes twice is suitable for the circumstances that every time the coalface is pushed forwards 10-50m, regional validation is substandard, and the extraction blank zone exists when the bedding drill holes are adopted to extract gas. Liquid nitrogen is injected through the bedding drill holes which are constructed, coal is quickly frozen by utilizing the low-temperature property of the liquid nitrogen (-196 DEG C) to build a low-temperature (below 0 DEG C) environment, inhibit desorbing of coal gas, and lower the gas scattering speed and the gas desorption amount. Quick outburst eliminating is achieved, the problems of the extraction blank zone, long extracting time, large project volume and large cost in the process of coal layer gas extraction are efficiently solved, and coal mining operation efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a device and a method for rapidly eliminating outbursts by secondary utilization of bedding drilling and injecting liquid nitrogen into frozen coal bodies. Background technique [0002] my country is a large coal-producing country in the world, and the demand for coal in various heavy and light industries is increasing. At the same time, my country is also a country where coal mine gas disasters are particularly serious. Gas disaster accidents have brought huge property losses and personal casualties. [0003] According to the "Regulations on the Prevention and Control of Coal and Gas Outburst", every time the mining face advances 10-50m, it is necessary to use the working face prediction method to carry out regional verification at least twice. Classified as a prominent dangerous area (this area is an area that does not meet the regional verification standar...

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Problems solved by technology

[0004] In order to solve the deficiencies in the prior art, the present invention provides a method to quickly freeze the coal body by injecting liquid nitrogen, inhibit the gas desorption of the coal body, reduce the gas release speed and the gas desorption amount, so as to realize rapid outburst elimination and solve the problem of coal seam A device and method for quickly eliminating outbursts in gas drainage by injecting liquid nitrogen into frozen coal bodies in the secondary utilization of the problems of drainage blank zone, long drainage time, large engineering quantity and high cost

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