A comprehensive thermo-economic model combining a geothermal heat mining system and a direct supercritical CO₂ turbine expansion electric power generation system was proposed in this paper. Assisted by this integrated model, thermo-economic and optimization analyses for the key design parameters of the whole system including the geothermal well pattern and operational conditions were performed to obtain a minimal levelized cost of electricity (LCOE). Specifically, in geothermal heat extraction simulation, an integrated well-bore-reservoir system model (T2Well/ECO2N) was used to generate a database for creating a fast, predictive, and compatible geothermal heat mining model by employing a response surface methodology. A parametric study was conducted to demonstrate the impact of turbine discharge pressure, injection and production well distance, CO₂ injection flowrate, CO₂ injection temperature, and monitored production well bottom pressure on LCOE, system thermal efficiency, and capital cost. It was found that for a 100 MW_e power plant, a minimal LCOE of $0.177/kWh was achieved for a 20-year steady operation without considering CO2 sequestration credit. In addition, when CO₂ sequestration credit is $1.00/t, an LCOE breakeven point compared to a conventional geothermal power plant is achieved and a breakpoint for generating electric power generation at no cost was achieved for a sequestration credit of $2.05/t.

结合地热热采系统和直接超临界 CO _{2 的}综合热经济模型本文提出了汽轮机膨胀发电系统。在该集成模型的辅助下，对包括地热井网和运行条件在内的整个系统的关键设计参数进行了热经济和优化分析，以获得最低的平准化电力成本 (LCOE)。具体而言，在地热采热模拟中，集成井筒-储层系统模型 (T2Well/ECO2N) 用于生成数据库，通过采用响应面方法创建快速、预测和兼容的地热采暖模型。进行了参数研究以证明涡轮机排放压力、注入和生产井距、CO ₂注入流量、CO _{2 的影响}注入温度，并监控生产井底压力对 LCOE、系统热效率和资本成本的影响。结果表明，对于 100 MW _e发电厂，在不考虑 CO2 封存信用的情况下，可实现 20 年稳定运行的最低 LCOE 为 0.177 美元/kWh。此外，当 CO ₂封存信用为 1.00 美元/吨时，与传统地热发电厂相比，实现了 LCOE 盈亏平衡点，并且实现了无成本发电的断点，封存信用为 2.05 美元/吨。