This paper presents a solar power tower generation system consisting of a supercritical carbon dioxide power cycle, a free-falling particle receiver, and a particle dual-tank thermal storage system. The objective is to achieve the maximum efficiency and the minimum levelized cost of electricity. Thermodynamics and economic models are developed, and key parameters of each subsystem, including the turbine inlet temperature, receiver aperture size, and temperature difference of thermal storage system, are analyzed. The results show that the highest overall efficiency, reaching 25.61%, is achieved when the turbine inlet temperature is 680 ℃, the receiver aperture size is 22 m ×22 m, and the temperature difference is 231 ℃. However, the lowest levelized cost of electricity, which is 0.7726 yuan/kWh, is attained when the turbine inlet temperature is 620 ℃, the receiver aperture size is 18 m ×18 m, and the thermal storage utilization temperature difference is 331 ℃.
Key words
solar thermal power /
particles /
carbon dioxide /
supercritical /
thermodynamics /
economic analysis
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References
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