Device and method for transforming physical characteristics of coal seam through downhole heat injection

Abstract

The invention provides a device and method for transforming physical characteristics of a coal seam through downhole heat injection, and relates to coal mining technologies. According to the device and method for transforming the physical characteristics of the coal seam through downhole heat injection, the technical problem that rock burst or outburst of coal and gas easily occurs during coal roadway tunneling is solved. According to the device and method for transforming the physical characteristics of the coal seam through downhole heat injection, a coal seam heating system is composed of acoal mine neutral water purifier-softener, a high pressure water pump, an electric heater, a heat injection pipeline and a heat injection drilling hole; water is injected into the electric heater through the high pressure water pump after being processed through the purifying-softener, the water is heated by the electric heater in the high-pressure state, and the generated superheated water is injected into the coal seam along a hole sealing pipe of the heat injection pipeline and the heat injection drilling hole; after water enters the coal seam, part of water is converted into water vapor along with reduction of pressure, and the superheated water and the water vapor is subjected to seepage along cracks of the coal seam and heat the coal seam; and the water after heat is released flowsinto a pumping and mining drilling hole and is discharged from the coal seam. After the coal seam is heated for a period of time, the physical characteristics such as adsorption, the strength and thespontaneous combustion point of coal can be changed in a short time, and rock burst or outburst of coal and gas during coal roadway tunneling is effectively prevented.

Description

technical field [0001] The invention relates to coal mining technology, in particular to a device and method for changing the physical properties of coal seams through heating. Background technique [0002] Temperature will affect many physical properties of coal. For example, heating the coal seam can reduce the adsorption of coal with various degrees of metamorphism to gas. After the lignite is heated, it can remove the moisture in the coal and change the ignition point of the lignite (temperature value ), heating the coal seam can enhance the plastic deformation ability of coal and reduce the tendency of coal and gas outburst. The modification of the physical properties of coal by heating the coal seam is the best method for intensive and rapid treatment of corresponding problems in coal mines. However, due to the special safety requirements of coal mines, and the exhaust air in coal mines contains explosive gas, there is no technology for changing the physical propertie...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a device and method for underground heat injection to transform the physical properties of coal seams in view of the fact that there is no technology in the prior art that can change the physical properties of coal seams by heating the underground coal seams of coal mines, so as to solve the problem of coal seams that are prone to occur during tunneling. Rockburst or coal and gas outburst technical problems

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