| 基于热流固耦合的增强型地热有机朗肯循环发电系统性能分析 |
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| 关键词:enhanced geothermal system ORC THM net power output thermal efficiency |
| 基金项目:国家自然科学基金项目(编号: 42102336);广东省自然科学基金项目(编号: 2021A1515011763) |
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| Numerical Simulation of Organic Rankine Cycle for Enhanced Geothermal Systems Based on a Thermal-hydraulic-mechanical Coupling Model |
| In this study, a detailed thermodynamic model coupled with wellbore, heat storage, and organic Rankine cycle power generation system was established, including a 3D unsteady thermal–hydraulic–mechanical (THM) coupled model and organic Rankine cycle power generation system thermodynamic model. Based on the geothermal geological characteristics of the Qiabuqia geothermal field in Gonghe Basin, Qinghai Province and the characteristic parameters of fractured reservoir, surrounding rock, fracture and wellbore, the effects of injection flow rate, injection temperature, and well spacing on net power output, annual net power output, and thermal efficiency were investigated. Under a certain injection flow rate, injection temperature, and net spacing, the pore pressure and thermal stress of rock increased the fracture permeability, and afterward, the power consumption of the injection pump and the net output work and thermal efficiency decreased. The increase in the injection flow improved the shaft work of the expander, power consumption of the injection pump, and drop rate of the production temperature, resulting in a decrease in thermal efficiency. The optimal injection flow rate at which the annual net power output reached a maximum value (1 470.1 kW) was 50 kg/s. The increase in injection temperature can improve thermal efficiency and reduce the annual drop rate of net power output. When the injection temperature was 60 ℃, the annual net output power was the maximum. The increase in well spacing slowed down the drop rate of production temperature, and this is conducive to the improvement of thermal efficiency; however, it also increased the power of the expander shaft and consumption power of the injection pump. The optimal well spacing at which the annual net power output reached the maximum value (1 497.3 kW) was 450 m. This study can provide guidance for the development and utilization of enhanced geothermal power generation system. |
| WANG Ling-bao,GUO Zhi-peng,BU Xian-biao,LI Hua-shan,GONG Yu-lie.2023.Numerical Simulation of Organic Rankine Cycle for Enhanced Geothermal Systems Based on a Thermal-hydraulic-mechanical Coupling Model[J].Acta Geoscientica Sinica,44(1):211-220. |
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