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Thermodynamic assessment of the dry-cooling supercritical Brayton cycle in a direct-heated solar power tower plant enabled by CO2-propane mixture

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  • Ma, Ning
  • Meng, Fugui
  • Hong, Wenpeng
  • Li, Haoran
  • Niu, Xiaojuan

Abstract

This paper proposes an improved recompression combined cycle configuration to explore the potential of using CO2-propane in a direct-heating solar power tower (SPT) plant. The effects of critical parameters on overall performance were detailly analyzed. The exergy distribution of CO2 and CO2-propane cycles was compared respectively after being optimized by a genetic algorithm. The results show that the exergy loss of regenerators was reduced, and the entire exergy efficiency of the SPT plant was improved by configuring two high-temperature regenerators. The cycle performance of propane, serving as the second additive, becomes more significant when the cooling temperature is increased. The overall thermal efficiency of the CO2-propane-configured SPT plant is 2.08% higher than using CO2 alone at a condensation temperature of 50 °C. Meanwhile, the exergy efficiency of the SPT plant with CO2-propane cycle decreases less (1.67%) than CO2 (2.02%) when the condensation temperature rises from 42 °C to 50 °C. However, the temperature difference of the receiver would decrease when using CO2-propane. This study provides a valuable reference for the application of CO2-propane mixture in the dry-cooling Brayton cycle of the direct-heated SPT plant.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:203:y:2023:i:c:p:649-663
    DOI: 10.1016/j.renene.2022.12.084
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    References listed on IDEAS

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    Cited by:

    1. Sun, Yan & Li, Hong-Wei & Wang, Di & Du, Chang-He, 2024. "A novel zero carbon emission system based on the complementary utilization of solar energy and hydrogen," Applied Energy, Elsevier, vol. 356(C).
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    3. Su, Zixiang & Yang, Liu & Wang, Hao & Song, Jianzhong & Jiang, Weixue, 2024. "Exergoenvironmental optimization and thermoeconomic assessment of an innovative multistage Brayton cycle with dual expansion and cooling for ultra-high temperature solar power," Energy, Elsevier, vol. 286(C).

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