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| Research on deep geothermal energy exploitation and storage system |
| WANG Jiacheng1, ZHAO Zhihong1, CHEN Jinfan1, HE Jie1, ZHOU Luming1, TAN Xianfeng2*
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1. School of Civil Engineering, Tsinghua University, Beijing 100084, China;
2. Shandong Provincial Lunan Geology and Exploration Institute, Jining 272100, Shandong, China |
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Abstract To study the performance of system combining common development and energy storage of deep geothermal energy under sustainable development conditions, seven evaluation criteria were defined. Thermal breakthrough time, water level and vertical displacement were used to assess the sustainable development of deep geothermal energy, and total recoverable energy, stored energy, energy gain coefficient and energy recovery efficiency were used to assess the operating performance of proposed system. Based on the well system which consists of two production wells and one injection well in Juancheng geothermal field, the coupled thermo-hydro-mechanical processes subject to seasonal exploitation and storage were demonstrated and the rationality and applicability of proposed evaluation criteria were validated, using the integrated geothermal reservoir model. The results showed that recoverable heat energy could increase about 360% by adding artificial thermal storage into common geothermal reservoir development, and the proposed system could meet the sustainable development demands of thermal breakthrough time, water level and vertical displacement. It is strongly recommended to add energy storage into the future geothermal reservoir development system, which promotes the development and utilization of urban deep geothermal energy on a larger scale and with higher quality.
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Published: 10 April 2024
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