Automatic measurement device and measurement method of underground coal mine seam gas content

Abstract

The invention discloses an automatic measurement device and measurement method of underground coal mine seam gas content. A PLC controller controls the on-off and start-stop of each of an electromagnetic valve I, an electromagnetic valve II, an electromagnetic valve III, an electromagnetic valve IV, an electromagnetic valve V, an anti-explosive servo motor I, an anti-explosive servo motor II, andan anti-explosive high-speed motor in a control system; a central multifunctional processing display is used for estimating the lost gas quantity by sensing the measurement data of a liquid pressure sensor I, a liquid pressure sensor II, a gas pressure sensor, a temperature sensor, a methane concentration sensor, and an intelligent flowmeter; therewith, a coal sample is smashed through a preset program without opening a coal sample tank, and the gas dissipation is reduced; and finally, the system automatically corrects the gas content at each stage, and computes the final coal seam gas contentand issues a report. The one-key operation can be realized through a touch screen, the gas desorption quantity can be automatically metered, the measurement efficiency of the coal seam gas content isgreatly improved, and the determination result is accurate, the structure is simple, and the process operation is convenient.

Description

technical field [0001] The invention relates to a coal seam gas content measuring device, in particular to a coal mine underground coal seam gas content automatic measuring device and a measuring method, belonging to the technical field of coal mine gas disaster prevention and control. Background technique [0002] Coal seam gas content is one of the important parameters for gas emission prediction, gas drainage effect evaluation, and coal and gas outburst risk prediction. At present, the underground desorption method is widely used in my country to measure coal seam gas content, and the national standard "Coal Seam Gas Downhole Direct Determination Method of Content" (GB / T 23250-2009). However, how to quickly and accurately measure the gas content of coal seams has always been an urgent problem to be solved in the field of coal mine gas prevention and control. [0003] At present, the published patent documents, such as a "gas desorption instrument" published on October 3, ...

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Problems solved by technology

[0003] At present, the published patent documents, such as a "gas desorption instrument" published on October 3, 2012 in the Chinese invention patent with the publication number of CN102706768A, control the experimental process by a single-chip microcomputer, monitor the water level, and monitor the gas desorption amount with the Analyze and calculate the time change rule to realize the intelligent measurement of the gas desorption amount. The gas desorption instrument adopts the drainage gas collection method for desorption, and the air bubbles generated by the desorption gas cause serious fluctuations in the water surface, which affects the reliability of the reading; in addition, the gas volume in the initial stage of desorption is large, and the water volume drops Fast, manual readings are inaccurate

A Chinese invention patent published on May 1, 2013, with a publication number of CN202916270U "Measurable Downhole Measuring Device for Measuring Coal Seam Outburst Gas Content", still needs to be read manually, and the volume of the measuring cylinder is fixed, and the excess part cannot be measured; The collected coal samples are sent to the laboratory on the ground for the measurement of residual gas content. The measurement cycle is long, and the gas is easily lost during transportation, resulting in small measurement results; the measurement data needs manual calculation and fitting, which is cumbersome and easy. go wrong

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