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Effect of turbine shaft cooling on the performance of supercritical carbon dioxide Brayton cycle system

Author

Listed:
  • Lin, Mingxiang
  • Guo, Chaohong
  • Li, Zhigang
  • Zhu, Yuming
  • Liang, Shiqiang
  • Wang, Bo
  • Xu, Xiang

Abstract

The supercritical carbon dioxide Brayton cycle is a closed system with a turbine that generates CO2 gas leaks when operating at high temperatures, pressures, and rotational speeds. Currently, dry gas seals are primarily used to mitigate these issues at the shaft end of rotating components. However, due to their limited heat resistance in high-temperature turbines and the operational challenges they face in such environments, it becomes necessary to apply active cooling measures to the turbine shaft. However, introducing cooling gas affects turbine performance and alters the state of the working fluid, which significantly impacts the overall system performance. This study evaluates the influence of turbine shaft cooling on real operational performance by using an actual system as the basis for analysis. The results show that as the turbine inlet temperature increases, the efficiency loss due to turbine shaft cooling also rises. When the compressor outlet pressure remains constant, an increase in the mass flow rate of working fluid reduces the efficiency loss caused by turbine shaft cooling. When the mass flow rate of the working fluid in the system remains constant, the efficiency loss due to turbine shaft cooling initially increases and then decreases as the compressor outlet pressure rises. Finally, when the cooling gas inlet temperature rises, the system efficiency loss due to turbine shaft cooling increases.

Suggested Citation

  • Lin, Mingxiang & Guo, Chaohong & Li, Zhigang & Zhu, Yuming & Liang, Shiqiang & Wang, Bo & Xu, Xiang, 2026. "Effect of turbine shaft cooling on the performance of supercritical carbon dioxide Brayton cycle system," Renewable Energy, Elsevier, vol. 260(C).
    • Handle: RePEc:eee:renene:v:260:y:2026:i:c:s0960148126000571
    DOI: 10.1016/j.renene.2026.125232
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    References listed on IDEAS

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    1. du Sart, Colin Francois & Rousseau, Pieter & Laubscher, Ryno, 2024. "Comparing the partial cooling and recompression cycles for a 50 MWe sCO2 CSP plant using detailed recuperator models," Renewable Energy, Elsevier, vol. 222(C).
    2. Luo, Qianqian & Luo, Lei & Xing, Haifeng & Du, Wei & Yan, Han, 2025. "Performance analysis of a scramjet engine thermoelectric conversion system using the SCO2 closed Brayton cycle," Renewable Energy, Elsevier, vol. 254(C).
    3. Chen, Rui & Romero, Manuel & González-Aguilar, José & Rovense, Francesco & Rao, Zhenghua & Liao, Shengming, 2022. "Optical and thermal integration analysis of supercritical CO2 Brayton cycles with a particle-based solar thermal plant based on annual performance," Renewable Energy, Elsevier, vol. 189(C), pages 164-179.
    4. Sleiti, Ahmad K. & Al-Ammari, Wahib A., 2021. "Off-design performance analysis of combined CSP power and direct oxy-combustion supercritical carbon dioxide cycles," Renewable Energy, Elsevier, vol. 180(C), pages 14-29.
    5. Zhao, Bingtao & Yao, Jiacheng & Su, Yaxin, 2023. "Performance response to operating-load fluctuations for Sub-megawatt-scale recuperated supercritical CO2 Brayton cycles: Characteristics and improvement," Renewable Energy, Elsevier, vol. 206(C), pages 686-693.
    6. Ma, Ning & Meng, Fugui & Hong, Wenpeng & Li, Haoran & Niu, Xiaojuan, 2023. "Thermodynamic assessment of the dry-cooling supercritical Brayton cycle in a direct-heated solar power tower plant enabled by CO2-propane mixture," Renewable Energy, Elsevier, vol. 203(C), pages 649-663.
    7. Yin, Zhiqiang & Yang, Jinyu & Feng, Yingsong & Ma, Zherui & Wang, Jiangjiang & Liu, Qibin, 2025. "Thermodynamics analysis of a biomass co-gasification based combined cooling, heating and power system," Renewable Energy, Elsevier, vol. 248(C).
    8. Wang, Gang & Dong, Boyi & Chen, Zeshao, 2021. "Design and behaviour estimate of a novel concentrated solar-driven power and desalination system using S–CO2 Brayton cycle and MSF technology," Renewable Energy, Elsevier, vol. 176(C), pages 555-564.
    9. Zhang, X.R. & Yamaguchi, H. & Uneno, D. & Fujima, K. & Enomoto, M. & Sawada, N., 2006. "Analysis of a novel solar energy-powered Rankine cycle for combined power and heat generation using supercritical carbon dioxide," Renewable Energy, Elsevier, vol. 31(12), pages 1839-1854.
    10. Miao, Zheng & Chen, Linhao & Han, Zunhao & Xu, Jinliang, 2024. "A novel boiler partial flow arrangement and partial load control strategies of a S-CO2 coal-fired power generation system," Energy, Elsevier, vol. 311(C).
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