将CO2地质封存与地热能开采相结合，利用CO2羽流地热（CPG）系统开采超临界CO2（sCO2），并通过再压缩sCO2布雷顿循环进行发电。建立了以太阳能为辅助热源的再压缩sCO2布雷顿循环CPG联合发电系统模型，研究了两类参数对联合发电系统性能的影响，并根据遗传算法进行全局参数优化以获得最大系统效率及最小度电耗sCO2量。结果表明：再压缩sCO2布雷顿循环CPG联合发电系统具有较高的热效率，其中，主压缩机入口压力与分流比是影响系统热力学性能的主要参数，通过设计参数优化，系统效率可高达18.47%，度电耗sCO2量减小至60.31kg/（kW·h）。

Aiming at combining CO2 geological sequestration with geothermal energy mining,the sCO2 extracted by the CO2 plume geothermal (CPG) system is used for power generation by recompressing the supercritical CO2(sCO2) Brayton cycle.In this paper,a recompression sCO2 Brayton cycleCPG combined power generation system with solar energy as an auxiliary heat source is established to study the combined effects of two types of parameters on the combined power generation system.Global parameter optimization is performed by using genetic algorithm in order to obtain the highest overall cycle efficiency and minimum sCO2 consumption per kilowatt power.The results show that the system has good thermodynamic properties.Moreover,the main compressor inlet pressure and split ratio are the main parameters affecting the thermodynamic performance of the system.By optimizing the design parameters,the cycle efficiency can be maximized to 18.47%,and the sCO2 consumption per kilowatt power can be minimized to 60.31 kg/(kW·h）.

TK123

国家自然科学基金面上项目（51976031）