A magnetically controlled current collecting device for increasing the concentration of gas drainage and its operating method

Abstract

The invention discloses a magnetic control type current collecting device capable of improving gas extraction concentration and an operation method thereof. The magnetic control type current collecting device comprises an extraction branch pipe (1), and one end of the extraction branch pipe extends into a coal seam; the other end of the extraction branch pipe is connected with an air inlet of a gas taking device (3) through a connection valve (2), an electromagnet I (7) is arranged at one end of a magnetic control tank, an electromagnet II (8) is arranged at the other end of the correspondingelectromagnet I, and an intelligent control valve I, an intelligent control valve II, the electromagnet I and the electromagnet II are all controlled by a control device (9); a baffle is arranged between the air inlet of the magnetic control tank and the electromagnet II; a piston with a permanent magnet (11) can be movably installed between the baffle and the electromagnet II, and the control device is used for driving the piston to move by controlling the magnetism of the electromagnet I and the electromagnet II and generating a magnetic effect with the permanent magnet. According to the magnetic control type current collecting device and the operation method thereof in the invention, the gas storage space inside the magnetic control tank is changed, so that near-zero negative pressure extraction of a gas extraction drilled hole and outer discharge of high-concentration gas of the magnetic control tank are realized, and the concentration and efficiency of gas extraction are improved.

Description

technical field [0001] The invention relates to a device for increasing the concentration of gas extraction, in particular to a magnetically controlled current collecting device for increasing the concentration of gas extraction and an operation method thereof, belonging to the technical field of gas extraction and utilization in coal mines. Background technique [0002] Gas drainage is a permanent solution to gas disasters in coal mines, and it is also the most fundamental way to utilize gas resources. State Administration of Work Safety Order [2015] No. 82 issued 10 regulations to strengthen coal mine methane control such as "excavation before excavation, extraction before mining, and drainage up to standard"; National Energy Administration [2016] No. 34 document " The Action Plan for Coalbed Methane Exploration and Development was formulated: 20 billion m of drainage will be completed by 2020 3 And the underground gas drainage target of coal mines with a utilization rate...

AI Technical Summary

Problems solved by technology

In recent years, many new hole-sealing technologies have emerged, such as solid-phase particle secondary sealing technology, bag-type hole-sealing technology, etc.; although the above-mentioned technologies can improve the sealing quality of boreholes to a certain extent, and increase the validity period of high-concentration gas drainage, However, due to the limitations of gas occurrence, geological conditions, and roadway air leakage and cracks, these technologies still cannot effectively solve the problem of low gas extraction concentration as a whole; in fact, the root cause of low gas drainage concentration is mainly the low negative pressure at the orifice The negative effect (carrying air infiltration) of the drainage gas; a large number of theories and engineering practices have proved that increasing the negative pressure of drainage has little effect on the scalar amount of gas extraction. Therefore, the key to solving the problem of low concentration of gas drainage is The pressure of the extraction orifice is basically balanced with the roadway air pressure, eliminating the leakage pressure gradient during extraction, and fundamentally eliminating the leakage problem

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