PERFORMANCE OPTIMIZATION OF SOLAR-COUPLED TWO-STAGE COMPRESSION INTERMEDIATE REHEAT CO2 TRANSCRITICAL RANKINE CYCLE FOR POWER GENERATION

Li Yifan; Wang Yuanchao; Yang Junlan; Han Yifei; Fang Yue; Zhao Liyang

doi:10.19912/j.0254-0096.tynxb.2024-0364

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (7) : 741-747. DOI: 10.19912/j.0254-0096.tynxb.2024-0364

Special Topics of Academic Papers at the 107th Annual Meeting of the China Association for Science and Technology

PERFORMANCE OPTIMIZATION OF SOLAR-COUPLED TWO-STAGE COMPRESSION INTERMEDIATE REHEAT CO₂ TRANSCRITICAL RANKINE CYCLE FOR POWER GENERATION

Li Yifan, Wang Yuanchao, Yang Junlan, Han Yifei, Fang Yue, Zhao Liyang

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Abstract

In order to improve the efficiency of Organic Rankine Cycle （ORC） system and reduce the pollution to the environment, this paper improves the conventional CO₂ transcritical Rankine cycle driven by solar energy. A two-stage compression with intermediate reheating is used to reduce the compressor power consumption and improve the system efficiency. Thermodynamic, economic and environmental models were established. The effects of the turbine inlet temperature, flow rate of heat transfer oil and shunt ratio on the thermodynamic-economic-environmental performance of a 900 kW class CO₂ Rankine cycle solar power system were investigated. Multi-objective optimization was carried out using the non-dominated sequential genetic algorithm （NSGA-Ⅱ）. The results show that the turbine inlet temperature has the greatest influence on thermal efficiency, and the shunt ratio and heat transfer oil flow rate have a greater influence on LCOE and CO₂ emission reduction, respectively. The Pareto optimal solutions are obtained by multi-objective optimization. The optimized results indicate that the thermal efficiency of the system is 21.76%, the levelized cost of electricity（LCOE） is 0.12 $/kWh, and the reduction of CO₂ emission is 9, 458 tons at turbine inlet temperature of 206 ℃, flow rate of heat transfer oil of 14.75 kg/s, and shunt ratio of 0.1. The study results can provide some theoretical guidance for the improvement and practical application of medium-and low-temperature photothermal power generation technology in China.

Key words

solar energy / Rankine cycle / multiobjective optimization / two-stage compression with intermediate reheating / thermodynamic-economic-environmental analysis

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Li Yifan, Wang Yuanchao, Yang Junlan, Han Yifei, Fang Yue, Zhao Liyang. PERFORMANCE OPTIMIZATION OF SOLAR-COUPLED TWO-STAGE COMPRESSION INTERMEDIATE REHEAT CO₂ TRANSCRITICAL RANKINE CYCLE FOR POWER GENERATION[J]. Acta Energiae Solaris Sinica. 2025, 46(7): 741-747 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0364

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