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Experimental study of the startup of a supercritical CO2 recompression power system

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  • Li, Xinyu
  • Qin, Zheng
  • Dong, Keyong
  • Wang, Lintao
  • Lin, Zhimin

Abstract

The supercritical CO2 Brayton cycle is a revolutionary power conversion technology. However, due to the lack of experimental research, the cycle's dynamic characteristics and control rules are still unclear. This study presents experimental research of a 300 kW supercritical CO2 recompression cycle power system based on two integrated high-speed turbo-alternator-compressor units, and characteristics of dynamic control, flow transition, and thermal inertia of the cycle are presented. The difficulty of generator startup increases with initial pressure, therefore a low-pressure startup strategy is proposed and verified. During startup, the closing time of turbine bypass value and control performance of the main compressor inlet temperature are found to have great influence on the stable operation of the cycle, and relevant control strategies are verified and discussed. The study also presents the existence, transformation mechanism, and flow characteristics of four flow modes during the startup of recompression cycle. These findings are of great help to judge the flow pattern of CO2 in the complex piping system and improve the transparency and safety level of system operation. Test results also show that despite the large thermal inertia, the load of recompression cycle can be quickly adjusted.

Suggested Citation

  • Li, Xinyu & Qin, Zheng & Dong, Keyong & Wang, Lintao & Lin, Zhimin, 2023. "Experimental study of the startup of a supercritical CO2 recompression power system," Energy, Elsevier, vol. 284(C).
    • Handle: RePEc:eee:energy:v:284:y:2023:i:c:s0360544223019321
    DOI: 10.1016/j.energy.2023.128538
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    References listed on IDEAS

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    4. Liu, Yunxia & Zhao, Yuanyang & Yang, Qichao & Liu, Guangbin & Li, Liansheng, 2024. "Research on compression process and compressors in supercritical carbon dioxide power cycle systems: A review," Energy, Elsevier, vol. 297(C).
    5. Cheng, Kunlin & Yu, Jianchi & Dang, Chaolei & Qin, Jiang & Jing, Wuxing, 2024. "Performance comparison between closed-Brayton-cycle power generation systems using supercritical carbon dioxide and helium–xenon mixture at ultra-high turbine inlet temperatures on hypersonic vehicles," Energy, Elsevier, vol. 293(C).
    6. Zhu, Jianlu & Xie, Naiya & Miao, Qing & Li, Zihe & Hu, Qihui & Yan, Feng & Li, Yuxing, 2024. "Simulation of boost path and phase control method in supercritical CO2 pipeline commissioning process," Renewable Energy, Elsevier, vol. 231(C).

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