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Dynamic simulation study of the start-up and shutdown processes for a recompression CO2 Brayton cycle

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  • Wang, Xuan
  • Cai, Jinwen
  • Lin, Zhimin
  • Tian, Hua
  • Shu, Gequn
  • Wang, Rui
  • Bian, Xingyan
  • Shi, Lingfeng

Abstract

Recently, supercritical carbon dioxide Brayton Cycles (SCBC) have been regarded as one of the most promising next-generation power cycles owing to their high efficiency, compact components, and feasible integration. The start-up and shutdown of SCBCs are important transition stages with complex operations involving the operation of the heat source, cooling source, compressor speed, CO2 filling system, and various control valves. However, there are few related literatures, and none presents a comprehensive description of all of the operations. Consequently, in this study, detailed discussions of all of the operations during both the start-up and shutdown processes for a recompression cycle are carried out by dynamic simulation. Some keys of the operations are found to help operators achieve successful start-up and shutdown in practice. For example, to avoid wasteful charging and discharging of CO2, the variations in the fuel supply and compressor speed should be coordinated. Moreover, to avoid surges, the changes in the speeds of the two compressors should not be too different. During the shutdown process, the decrease in the fuel supply should be slower than the decrease in compressor speed to reduce the total negative work consumed by the system; the opposite is true during the start-up process.

Suggested Citation

  • Wang, Xuan & Cai, Jinwen & Lin, Zhimin & Tian, Hua & Shu, Gequn & Wang, Rui & Bian, Xingyan & Shi, Lingfeng, 2022. "Dynamic simulation study of the start-up and shutdown processes for a recompression CO2 Brayton cycle," Energy, Elsevier, vol. 259(C).
    • Handle: RePEc:eee:energy:v:259:y:2022:i:c:s0360544222018291
    DOI: 10.1016/j.energy.2022.124928
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    References listed on IDEAS

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    4. Jiang, Yuan & Liese, Eric & Zitney, Stephen E. & Bhattacharyya, Debangsu, 2018. "Design and dynamic modeling of printed circuit heat exchangers for supercritical carbon dioxide Brayton power cycles," Applied Energy, Elsevier, vol. 231(C), pages 1019-1032.
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