The Utilization Evaluation Of Deep Geothermal Energy And Research On Thermal Coal Collaborative Mining Technology In Anju Coal Mine

With the increase of mining depth,the surrounding rock temperature increases,and the high temperature geothermal energy increases gradually with the increase of mining depth.As an important part of geothermal resources,this heat energy is a renewable and clean energy that is not affected by environmental factors.It is a renewable energy in the process of coal resource mining and has great development potential in China’s future energy field.Therefore,the collaborative mining of geothermal and coal resources is an important development direction of deep mine mining.Taking Anju Coal Mine as the actual engineering background,the thermal coal cooperative mining technology system is used in this thesis,which mainly focuses on the filling and buried pipe mining and the goaf water storage and mining,to evaluate the comprehensive reserves of geothermal resources in deep mines,the key parameters of the thermal coal cooperative mining working face of Anju Coal Mine are analyzed,and the design method of the thermal coal cooperative mining project of Anju Coal Mine is put forward.The main research contents are as follows:(1)The borehole temperature measurement and geological model are used to collect the geological and rock physical property data in the study area,to analyze the temperature,occurrence state and physical and chemical characteristics of geothermal fluid in deep mines,detect the geothermal resource reserves in typical rock reservoirs in deep mines,and evaluate the comprehensive utilization reserves of thermal energy in each heat storage rock stratum in deep mines.(2)Based on the engineering geological conditions of Anju Coal Mine,two kinds of heat recovery modes are selected,which are the filling pipe heat recovery mode and the goaf storage water heat recovery mode,and the heat conduction law and characteristics of the goaf storage water heat transfer mode are studied.The water storage and thermal recovery technology in goaf is used to establish the water storage model in goaf caving zone and analyze the effect of water storage and thermal recovery in goaf.(3)This thesis expounds the principles of heat recovery technology by filling and burying pipes behind scaffold and heat recovery technology by longwall-roadway filling and burying pipes,and establishes the heat recovery model by using ANSYS software to analyze the heat extraction law under different surrounding rock temperatures and different water injection cycles.Based on the technology of heat recovery by filling and burying pipes,the extraction range,extraction period and extraction efficiency of heat energy under different pipe numbers,pipe diameters and pipe spacing are analyzed.(4)In view of the engineering geological conditions of the filling mining face of Anju Coal Mine,the key parameters of the thermal coal cooperative mining face are analyzed,the thermal coal cooperative mining system and process flow of the face are designed,the key equipment for thermal coal cooperative mining is selected,the cooperative mining model of geothermal and coal resources is developed,and the lowgrade thermal energy application technology system is established.The thesis has 48 figures,18 tables and 89 references.