不同聚光方式下的光热 SCO₂发电系统经济性与环保性分析

In this paper，the economic and environmental performance of SCO₂ power systems under linear Fresnel，trough parabolic and tower concentrating methods are analyzed respectively，and the effects of different thermal energy storage working fluids and SCO₂ cycles on system performance are compared. Finally，the multi-objective optimization is conducted for the proposed systems. The results show that increasing the hot tank temperature or decreasing the cold tank temperature contribute to lower investment cost. The SPT plant integrated with recompression SCO₂ cycle and NaCl-KCl-MgCl₂ molten salt as the thermal storage medium provides the best thermoeconomic and environmental performance. In Delingha，the system cost is 0.131 $/kWh over the life sycle and produces 24.3 g/kWh of CO₂-equivalent emissions per kWh of output.