Device for measuring coal bed gas content based on flow method and measuring method thereof

Abstract

The invention relates to a device for measuring the coal bed gas content based on a flow method. The device comprises a drilling machine, a drill rod, a drill bit, a compressed air connector, a wall protection steel pipe and a comprehensive measurement sleeve, wherein a compressed air opening is formed in the middle of the drill bit; a compressed air passage is arranged in the middle of the drillrod; and a drilling machine propeller and a drilling machine clamper are respectively arranged on the drill rod in a sleeving way. The compressed air connector is arranged at the back end of the drillrod; and a flowmeter is arranged on an underground compressed air pipeline. A polyurethane layer is fixedly arranged between the wall protection steel pipe and a coal bed drilling hole. The comprehensive measurement sleeve is arranged at the back part of the wall protection steel pipe in a sleeving way; a drill rod inserting hole is designed in the middle of the back end of the comprehensive measurement sleeve; a methane depth sensor is fixedly arranged on the inner wall of the comprehensive measurement sleeve; a data memory is arranged at the upper end of the outer wall of the comprehensivemeasurement sleeve; a slag discharging opening is formed in the lower end of the back part of the comprehensive measurement sleeve; and a coal sample tank is fixedly arranged on the slag discharging opening. The device for measuring the coal bed gas content based on the flow method has the advantages that the coal bed drilling hole is mainly constructed in an underground working face of a coal mine; and the gas emission quantity in the coal slack discharging process of the drilling hole is measured in the drilling hole construction process.

Description

technical field [0001] The invention relates to the technical field of coal mine safety, in particular to a device for measuring coal seam gas content based on a flow method and a measuring method thereof. Background technique [0002] Coal seam gas content is an important index to evaluate the law of coal seam gas occurrence. It is an important coal seam parameter in the field of coal bed methane development and coal and gas outburst prevention and control. At present, the conventional methods for measuring coal seam gas content mainly include direct method and indirect method. The gas content of the coal seam is determined by the method, that is, the original coal core is collected by the coal seam borehole, and the desorption method is used to directly measure the desorption amount of the coal seam gas and the residual amount in the laboratory. The principle of this method to measure the coal seam gas content is: according to the gas desorption amount and desorption law o...

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Problems solved by technology

[0003] Both of the above two methods have relatively large errors. The direct method needs to drill holes in the coal seam to collect the original coal core, and the process of collecting the coal core is relatively long, which causes gas diffusion and cannot obtain the original coal core in the true sense. The amount of loss can be calculated by the formula; the indirect method is used to reverse the calculation, because it is also calculated by the formula, there are also considerable errors

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