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Energy and exergy analyses of a parabolic trough concentrated solar power plant using molten salt during the start-up process

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  • Zhang, Shunqi
  • Liu, Ming
  • Zhao, Yongliang
  • Liu, Jiping
  • Yan, Junjie

Abstract

Daily start-up is the character of concentrated solar power (CSP) plants because of solar energy intermittency. Thus, much energy is consumed during the start-up process of CSPs plants. Detailed energy and exergy analyses on the start-up process can guide CSP design and operation. In this study, energy and exergy analyses for parabolic trough concentrated solar power plants using molten salt during start-up processes were conducted, and the distributions and causes of energy loss were investigated. Results indicate that the total start-up energy loss accounts for 52.32% of total input energy. Collector optical loss, turbine cold source loss, and receiver heat loss are major ones, accounting for 45.80%, 23.11%, and 17.91% of the total energy loss, respectively. The exergy loss of the entire start-up process accounts for 67.11% of the total input exergy. Collector exergy loss due to optical efficiency and receiver exergy loss due to heat loss are major ones, accounting for 77.74% and 9.19% of the total exergy loss, respectively. Compared with recirculating pump utilization, utilizing the molten salt anti-freezing solution of the low-load regenerative heater can reduce start-up energy consumption. This work can lay a foundation for the energy-saving optimization of CSP plants during start-up processes.

Suggested Citation

  • Zhang, Shunqi & Liu, Ming & Zhao, Yongliang & Liu, Jiping & Yan, Junjie, 2022. "Energy and exergy analyses of a parabolic trough concentrated solar power plant using molten salt during the start-up process," Energy, Elsevier, vol. 254(PC).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pc:s0360544222013834
    DOI: 10.1016/j.energy.2022.124480
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    5. Zhang, Shunqi & Liu, Ming & Zhao, Yongliang & Zhang, Kezhen & Liu, Jiping & Yan, Junjie, 2022. "Thermodynamic analysis on a novel bypass steam recovery system for parabolic trough concentrated solar power plants during start-up processes," Renewable Energy, Elsevier, vol. 198(C), pages 973-983.

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