Coal body heating device and method for promoting gas extraction

Abstract

The invention provides a coal body heating device and method for promoting gas extraction. The coal body heating device comprises heating holes and extraction holes which are alternately formed in a coal seam, hole protection floral tubes connected with units are arranged in the heating holes, heating floral tubes connected with units are arranged in the hole protection floral tubes, the heating floral tubes are filled with heating powder bags, and water passing gaps are reserved between the heating powder bags. The hole bottom ends of the hole protection floral tubes are conical, and the holeprotection floral tubes of other units are in threaded connection with one another. End part slim tubes of the hole bottom unit heating floral tubes are in threaded connection with the hole bottom hole protection floral tubes and are in communication with a water return tube. A heating agent is packaged in each heating powder bag, the heating powder bags are subjected to a violent exothermic reaction after encountering water for a certain period of time, a large amount of heat and high-temperature hot gas are released, coal is rapidly and uniformly heated, coal gas is promoted to be convertedfrom an adsorption state to a free state, migration and flowing to the extraction holes are accelerated, and therefore the purpose of enhancing the gas extraction effect is achieved. The device and the method are convenient for underground transportation, can be repeatedly used, are flexible to operate, and can obviously shorten the gas extraction time.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a coal body heating device and method for promoting gas extraction. Background technique [0002] High gas and outburst mines are widely distributed in my country. Gas is one of the main disasters that threaten mine safety. Gas drainage is the most common and effective way to reduce gas disasters. At present, the methods of heating coal body to promote gas drainage mainly include heating coal body with high temperature and high pressure gas, heating coal body with microwave, etc. Most of the existing methods of injecting high-temperature and high-pressure gas to heat the coal body are single-layer pipe sealing, which is not conducive to disassembly and recovery, and affects subsequent coal mining operations. The temperature of the heated coal body generally cannot exceed 100 °C. Because the coal body has a certain resistance to microwaves, the effective range of ...

AI Technical Summary

Problems solved by technology

The existing methods of injecting high-temperature and high-pressure gas to heat the coal body are mostly single-layer pipe sealing, which is not conducive to disassembly and recovery, and affects subsequent coal mining operations. The temperature of the heated coal body generally cannot exceed 100°C

Because the coal body has a certain resistance to microwaves, the effective range of microwave heating is small or the heating temperature of each part of the coal body varies greatly, and the efficiency of gas extraction is not high.

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