Performance comparison of three supercritical CO2 solar thermal power systems with compressed fluid and molten salt energy storage

• Published in: Energy (Oxford) 2023-11, Vol.282, p.128807, Article 128807
• Main Authors: Zhao, Yu, Chang, Zhiyuan, Zhao, Yuanyang, Yang, Qichao, Liu, Guangbin, Li, Liansheng
• Format: Article
• Language: English
• Subjects: carbon dioxide; cost effectiveness; exergy; mathematical models; power generation; solar thermal energy
• ISSN: 0360-5442
• DOI: 10.1016/j.energy.2023.128807

In recent years, the supercritical carbon dioxide (sCO₂) Brayton cycle power generation system has gradually attracted the attention of academics as a solar thermal power generation technology. To achieve the stable and effective use of solar energy, three sCO₂ solar power generation systems were studied in this paper. These systems included a molten salt thermal storage system, a compressed CO₂ energy storage system, and a combined molten salt thermal storage and compressed CO₂ energy storage system. The thermodynamic analysis model of the sCO₂ power generation system is constructed, and a mathematical model of the solar power tower system is produced. The operating conditions, thermal efficiency, exergy efficiency, and economics of these three systems on typical days are investigated and compared. The results indicate that the power generation system coupled with compressed CO₂ storage has higher thermal and exergy efficiencies than the other two systems with the same daily heliostat field. The thermal efficiencies can be as high as 6.56% and 5.91% respectively, and the exergy efficiencies as high as 5.76% and 6.22% respectively. The system coupled with compressed CO₂ energy storage is more cost-effective and has a shorter payback period than the system coupled with molten salt thermal storage system and the system with both forms of energy storage.