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Design and Performance Analysis of a Novel Integrated Solar Combined Cycle (ISCC) with a Supercritical CO 2 Bottom Cycle

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  • Zuxian Zhang

    (Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, National Thermal Power Engineering & Technology Research Center, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China)

  • Liqiang Duan

    (Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, National Thermal Power Engineering & Technology Research Center, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China)

  • Zhen Wang

    (Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, National Thermal Power Engineering & Technology Research Center, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China)

  • Yujie Ren

    (China Academy of Building Research, Beijing 100013, China)

Abstract

The integrated solar combined cycle (ISCC) system is a proven solution for grid-connected power generation from solar energy. How to further improve the ISCC system efficiency and propose a more efficient system solution has become a research focus. A novel gas turbine combined cycle (GTCC) benchmark system is proposed by replacing the conventional steam Rankine bottom cycle with a supercritical CO 2 Brayton cycle, whose output power and efficiency are increased by 9.07 MW and 1.3%, respectively, compared to those of the conventional GTCC system. Furthermore, the novel ISCC systems are established with the parabolic trough solar collector (PTC) and the solar tower (ST) collector coupled to the novel GTCC system. Thermal performance analysis, exergy performance analysis, and the sensitivity analysis of the ISCC systems have been performed, and the results show that the system efficiencies of both ISCC systems are lower than that of the GTCC system, at 57.1% and 57.5%, respectively, but the power generation of the ISCC system with PTC is greater than that of the benchmark system, while that of the ISCC system with ST is less than that of the benchmark system. The photoelectric efficiency of the ISCC system with PTC is 27.6%, which is 2.1% greater than that of ISCC system with ST. In the ISCC system with PTC, the components with the highest exergy destruction and the lowest exergy efficiency are the combustion chamber, and PTC, respectively. ST is the component with the highest exergy destruction and the lowest exergy efficiency in the ISCC system with ST. With the increase in direct normal irradiance (DNI), the total output power, solar energy output power, and photoelectric efficiency of the ISCC system with PTC increase, while the system efficiency decreases; the solar energy output power and photoelectric efficiency of the ISCC system with ST increase, while the total output power and system efficiency decrease. The photoelectric efficiency of the ISCC system with PTC is greater when the DNI is greater than 600 W/m 2 ; conversely, the photoelectric efficiency of the ISCC system with ST is greater. After sensitivity analysis, the optimal intercooler pressure for the ISCC system is 11.3 MPa.

Suggested Citation

  • Zuxian Zhang & Liqiang Duan & Zhen Wang & Yujie Ren, 2023. "Design and Performance Analysis of a Novel Integrated Solar Combined Cycle (ISCC) with a Supercritical CO 2 Bottom Cycle," Energies, MDPI, vol. 16(12), pages 1-27, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:12:p:4833-:d:1175484
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    References listed on IDEAS

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