【摘要】 分析分别在线性菲涅尔式、槽形抛物面和塔式聚光方式下的SCO₂发电系统的经济性和环保性，同时比较不同种类的储热工质和SCO₂循环型式对系统性能的影响，并对系统参数进行多目标优化设计。结果表明：降低低温储热罐内工质温度或增大高温储罐内工质温度可减少投资成本；基于塔式集热器和再压缩式SCO₂循环的光热SCO₂发电系统兼具最佳热经济性和环保性，其中使用NaCl-KCl-MgCl₂三元高温熔融盐作为储热工质。在德令哈地区该系统全生命周期内度电成本为0.131美元/kWh，输出每kWh电产生的CO₂当量排放为24.3 g/kWh。更多还原

【Abstract】 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 SCO₂cycles 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.更多还原