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Coal permeability enhancement method for microwave hot air coupled heat injection

A technology of microwave hot air and coal body, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well parts, etc., to achieve the effect of expanding coal seam cracks, good coal seam permeability enhancement, and dredging pores

Active Publication Date: 2019-02-19
CHINA UNIV OF MINING & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

These measures have achieved certain results in the work of coal seam permeability enhancement, but there are also great limitations, so some coal seam permeability enhancement methods with wider or different application areas are needed

Method used

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  • Coal permeability enhancement method for microwave hot air coupled heat injection

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Embodiment Construction

[0019] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0020] The coal body anti-reflection method of microwave hot air coupling heat injection of the present invention: first, construct a borehole 2 in the coal seam 1, send into the hot air pipe 3 and the microwave protection pipe 6 in the borehole 2 after the construction is completed, and the hot air The distance between the exposed ends of the tube and the microwave protective tube is 0.1 m from the orifice. The microwave protective tube 6 is made of polytetrafluoroethylene. Afterwards, the microwave antenna 4 is connected to the front end of the coaxial waveguide 5 , and then it is sent into the microwave protection tube 6 until the microwave antenna 4 reaches the inner end of the microwave protection tube 6 . The exposed end of the coaxial waveguide 5 is sequentially connected to the waveguide converter 7, the rectangular waveguide 8 and the microwave ge...

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Abstract

A coal body anti-reflection method using microwave hot air coupled heat injection. First, drill holes into the coal seam, connect the microwave antenna to the inner end of the coaxial waveguide, and send it into the drill hole together. Then connect the waveguide converter, rectangular waveguide and microwave generator to the outer end of the coaxial waveguide in sequence. Then connect the heater with a pipe and pass it into the drill hole. After the equipment is installed, high-pressure hot air is delivered to the borehole, and the microwave is turned on for radiation. Microwave radiation can effectively promote gas desorption, and the thermal stress generated can damage the coal body and produce micro-cracks. At the same time, high-pressure hot air will flow rapidly along the coal seam cracks, blowing away the coal debris in the cracks, and expanding the coal seam cracks. Combining the two, microwaves not only produce a radiation effect on the coal body, but also have the effect of further heating the wind flow, making it easier to dredge the pores of the coal body, achieving a good effect of increasing the transparency of the coal body and promoting gas analysis.

Description

technical field [0001] The invention relates to a coal body anti-reflection method for microwave hot air coupled heat injection, which belongs to the related technical field of underground coal anti-permeability in coal mines, and is especially suitable for soft, high-gas and low-permeability coal seams. Background technique [0002] With the continuous deepening of coal mining depth in our country, the air permeability of coal seams restricts gas drainage more and more seriously, and good coal seam anti-reflection technology has become an essential technology for deep coal mine mining. At present, the gas extraction method in my country is mainly drilling, which has high requirements on the air permeability of coal seams. In order to improve the air permeability of coal seams, many scholars in my country have proposed many coal seam permeability enhancement methods, such as drilling inside Crack pressure relief and anti-permeability methods, loose blasting coal anti-permeabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B43/00E21B43/24E21B43/26
CPCE21B43/00E21B43/2401E21F7/00
Inventor 林柏泉王正李贺杨威洪溢都
Owner CHINA UNIV OF MINING & TECH
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