Method for improving gas extraction rate by extracting geothermic energy

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...

AI Technical Summary

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 carbon dioxide, nitrogen or high-temperature flue gas. However, the thermal conductivity of coal Poor, to achieve coal seam heating, a large amount of additional external heat is required, resulting in high energy consumption and cost of gas extraction

Images