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Thermo-economic analysis of regenerative supercritical CO2 Brayton cycle considering turbomachinery leakage flow

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  • Feng, Jiaqi
  • Wang, Junpeng
  • Chen, Zhentao
  • Luo, Zhengyuan
  • Bai, Bofeng

Abstract

The regenerative supercritical CO2 Brayton cycle (RSCBC) has great potential to improve the energy utilization efficiency and reduce greenhouse gas emissions. The leakage of supercritical CO2 into rotor cavity through labyrinth seals in turbomachinery including turbine and compressor inevitably reduces the cycle efficiency. Here, we propose a numerical method coupling the thermodynamic model with the labyrinth seal leakage model. The variations of turbomachinery leakage flow with cycle parameters and its effect on cycle thermo-economic performance are investigated. The optimal cycle parameters and thermo-economic performance are obtained by the multi-objective optimization. We find the cycle maximum pressure benefits the thermo-economic performance, while penalizes the sealing performance of turbomachinery labyrinth seal. Compared with ignoring the turbomachinery leakage, the optimal inlet state of the compressor vicinity of the pseudo-critical point that is adjacent to critical point when considering turbomachinery leakage. Furthermore, the turbomachinery leakage flow accounted for 2.5 % of the total flow under the optimized working condition, causing the thermal efficiency and exergy efficiency decrease 1.38 % and 3.52 % respectively, the heat exchanger area per unit power output and levelized energy cost increase 3.8 % and 3.83 % respectively. The proposed method and obtained results can provide some guidance for the optimal design of RSCBC system.

Suggested Citation

  • Feng, Jiaqi & Wang, Junpeng & Chen, Zhentao & Luo, Zhengyuan & Bai, Bofeng, 2024. "Thermo-economic analysis of regenerative supercritical CO2 Brayton cycle considering turbomachinery leakage flow," Energy, Elsevier, vol. 290(C).
    • Handle: RePEc:eee:energy:v:290:y:2024:i:c:s0360544223034928
    DOI: 10.1016/j.energy.2023.130098
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    References listed on IDEAS

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    1. Iverson, Brian D. & Conboy, Thomas M. & Pasch, James J. & Kruizenga, Alan M., 2013. "Supercritical CO2 Brayton cycles for solar-thermal energy," Applied Energy, Elsevier, vol. 111(C), pages 957-970.
    2. Kim, Sunjin & Cho, Yeonjoo & Kim, Min Soo & Kim, Minsung, 2018. "Characteristics and optimization of supercritical CO2 recompression power cycle and the influence of pinch point temperature difference of recuperators," Energy, Elsevier, vol. 147(C), pages 1216-1226.
    3. Xiao, Tingyu & Liu, Chao & Wang, Xurong & Wang, Shukun & Xu, Xiaoxiao & Li, Qibin & Li, Xiaoxiao, 2022. "Life cycle assessment of the solar thermal power plant integrated with air-cooled supercritical CO2 Brayton cycle," Renewable Energy, Elsevier, vol. 182(C), pages 119-133.
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