Method for improving gas extraction rate by extracting geothermic energy

A gas drainage and energy extraction technology, applied in geothermal power generation, heat collectors without external energy operation, etc., can solve the problems of poor thermal conductivity of coal, high energy consumption and cost of gas, and achieve high heating efficiency and wide application The effect of sex and simple structure

Active Publication Date: 2018-03-09
CHINA UNIV OF MINING & TECH
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Problems solved by technology

The current methods of coal seam heating to improve gas extraction rate all need to provide additional direct heat sources or chemical substance reaction heat sources, and these heat sources are used to heat coal seams or heat other media such as car

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  • Method for improving gas extraction rate by extracting geothermic energy

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[0024] An embodiment of the present invention will be further described below in conjunction with the accompanying drawings:

[0025] Such as figure 1 As shown, the method for improving gas drainage efficiency by extracting geothermal energy of the present invention has the following specific steps:

[0026] a) Construct multiple boreholes at intervals in the heat source area 19 of the mine, and embed a heat collection tube 1 in each borehole. One end of the exposed section of the heat collection tube 1 is arranged in the hot water tank 6 with the exposed orifice to the hot water collection The heat-collecting heat pipe section of the inlet section of the tank 6 is provided with a heat pipe insulation layer 2, and the heat-collecting heat pipe 1 section arranged in the hot water tank 6 is equipped with fins 3, and the head of the heat-collecting heat pipe 1 is provided with an end cover 4 , The end cover 4 is fixed on the copper heat pipe vessel 8 in the hot water tank 6 through a...

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Abstract

The invention discloses a method for improving a gas extraction rate by extracting geothermic energy. The method comprises the following steps: firstly, constructing and drilling in a heat source rocklayer and burying a heat collection heat pipe; evaporating and condensing a working medium and rapidly transferring heat to a heat collection water tank through the heat collection heat pipe; carrying out heat exchange on the heat collection water tank and a heat source water tank through a heat exchanger, so as to heat water in the heat source water tank; distributing a heating heat pipe in a gas extraction drilled hole and heating an extraction coal layer by the heat source water tank through the heating heat pipe; continuously transferring the heat into the extraction coal layer along continuous phase change of an evaporation section and a condensation section of the working medium in the heating heat pipe. The method disclosed by the invention is high in heat transferring efficiency;an extra direct heat source or chemical substance reaction heat source does not need to be provided; the energy consumption and the cost of the gas extraction are low; the method is especially suitable for the gas extraction of low-ventilation and high-adsorption coal layers under coal mines.

Description

technical field [0001] The invention relates to a method for increasing the gas extraction rate, in particular to a method for extracting geothermal energy suitable for underground coal mines with low air permeability and high adsorption coal seams to improve the efficiency of underground gas extraction in coal mines, and belongs to the technical field of coal safety mining. Background technique [0002] Gas is the main hazard factor in coal mine production. The increase of gas content will reduce the oxygen content in the air, and then people will suffocate due to lack of oxygen; when the gas concentration reaches 5-16% and the oxygen concentration exceeds 12%, a gas explosion will occur when encountering a high-temperature heat source; areas with certain conditions are in Coal and gas outburst accidents may occur during mining. [0003] Existing methods to improve the efficiency of gas drainage are to form cracks and gas migration channels in the coal seam through artific...

Claims

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Application Information

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IPC IPC(8): F24T10/40
CPCY02E10/10
Inventor 朱传杰杨凯林柏泉卢细苗高子善
Owner CHINA UNIV OF MINING & TECH
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