Apparatus and method for rapid determination of parameters of residual gas on mining working face of underground coal mine

Abstract

The invention relates to an apparatus and a method for rapid determination of parameters of residual gas on a mining working face of an underground coal mine. The determination apparatus is provided with a coal sample tank; a pneumatic motor is arranged at the lower part of the coal sample tank; a rotating shaft is mounted on the upper part of the pneumatic motor; a crushing cutter head is installed at a side surface of the rotating shaft; the upper part of the coal sample tank is communicated with one end of a gas-guide tube, and the other end of the gas-guide tube is connected with a high precision pressure gauge; a gas stop valve is arranged at a joint position of the gas-guide tube and the coal sample tank; the side surface of the gas-guide tube is communicated with an interface of a three-way angle valve through a connection flexible pipe, and the other two interfaces of the three-way angle valve are respectively communicated with the bottoms of burette I and burette II through connection pipes. The determination method comprises the following steps: determination of curves representing the relationship between different balance pressures during adsorption of methane by coal and desorption quantity and the relationship between the different balance pressures and methane content; determination of desorbable gas quantity on the working face and calculation of content, pressure and expansion energy of residual gas on the mining working face. The determination method for residual gas on the mining working face has the advantages of a short period of time, small workload and high reliability of determination results, provides multi-parameter determination indexes for prediction of prominent dangers and examination of outburst prevention effects and has significant meaning to development of outburst prevention technology on a working face.

Description

Technical field [0001] The invention relates to a method for measuring residual gas parameters of a mining face in a coal mine, in particular to quickly determining the amount of gas that can be desorbed in a mining face and accurately obtaining the residual gas content, residual gas pressure and residual gas expansion energy of the working face through analysis and calculation A device and method for quickly measuring residual gas parameters in a mining face in a coal mine. Background technique [0002] With the extension of mine mining depth, most mines have gradually changed from gas mines to high gas or even outburst mines. Gas has become one of the main factors restricting the development of mining areas. The Regulations on Prevention and Control of Coal and Gas Outburst require that outburst mines should predict the outburst risk of outburst coal seams based on coal seam gas pressure or gas content; and require that residual gas pressure and residual gas content should be u...

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Problems solved by technology

[0003] In order to solve the problem that the existing measurement methods cannot accurately measure the residual gas pressure of the coal seam, the present invention provides a device and method for quickly measuring the residual gas parameters of the mining face in the underground of a coal mine. The curve fitting equations of different equilibrium pressures and desorption amounts of coal adsorbed methane and the curve fitting equations of different equilibrium pressures and methane content curves of coal adsorbed methane are obtained in advance; when predicting the outburst risk of the mining face or checking the effect of outburst prevention, the rapid measurement in the mine can be used The device measures the amount of gas that can be desorbed in the mining face, and then accurately calculates three gas parameters: the residual gas content, the residual gas pressure and the residual expansion energy of the working face; Small amount, few influencing factors, high reliability of the measurement results, and it is suitable for rapid measurement of multiple points in the same coal seam mining face, providing multi-parameter judgment indicators for the prediction of the outburst risk of the working face and the inspection of the outburst prevention effect, with higher reliability Safety and security are of great significance to the development of anti-outburst technology on working faces

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