Utilization Of The Deep Geothermal Resource In Tangkou Coal Mine

Geothermal energy is a kind of green and clean energy,the total amout of geothermal resources in earthcrust is huge,it is estimated that the total amount of geothermal energy goes down to 5000 m deep is equal to 494.8 trillion tons of standard coal,because geothermal energy is clean and pollution-free,it becomes a competitive energy for many countries.In the underground mine system,the geothermal resource in mine rock body and mine systems has considerable development value.For many coal mines in the central and eastern part of our country,the shallow resources are exhausted gradually,the coal mining gradually turn to the deep,the mine heat disaster is getting serious,it is a valuable research topic that how to combine the heat damage control and geothermal utilization.Tangkou coal mine is an important coal mine for Shandong energy Zibo mining group,the mining deep is over 1000 m,the original rock temperature exceeds 30?,geothermal phenomenon is obvious.In this paper,taking the deep geothermal resources of Tangkou coal mine as research point,through field investigation,data collection,theoretical research and numerical simulation methods,the general situation of geothermal resources in Tangkou coal mine and its mining method are discussed here,The main achievements are as follows:(1)The formation lithology,hydrogeology condition,geological structure and mine heat damage condition are sorted and collected here,the borehole temperature data of related papers are collected and analysed,the temperature field characteristics of mine is summarized,the geothermal condition of mine field is summarized here.(2)According to the relevant information data and field research data,preliminarily define the scope of geothermal area,reservoir thickness,reservoir area.the ordovician reservoir parameters are collected from relevant papers and data.Based on these data,Tangkou coal mine reservoir geothermal concept model is established here.Using numerical simulation software to simulate the exploitation of geothermal resources using geothermal doublet model,the reservoir temperature field change in the case of the production cycle is analysed here,the production cycle of different extraction velocitys and system output are discussed here.(3)The total amount of geothermal resources of ordovician reservoirs in Tangkou coal mine area are estimated.,the water quality of reservoir water is analyzed by the mine early hydrogeology borehole,the geothermal water salinity,acid,alkaline,hydrochemical type,corrosion and fouling conditions are analyzed here.Through the heat storage method,the available mining amount of the geothermal water in tangkou mining area is calculated,which can meet the mining speed and the maximum daily output.(4)The total amount of various available waste heat load calculation of waste heat resources is calculated,also include available recycled energy per day,available recycled power per day,this article puts forward the idea of simultaneous extraction of coal and geothermal resources.This paper puts forward the comprehensive utilization plan,unified management and comprehensive utilization of the heat source of different tastes in the coal mine,the mine water,the deep geothermal water,the water of the living area and the mine back wind.The economic,environmental and social impact of the comprehensive utilization plan of mine geothermal energy are evaluated comprehensively.