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Measures to reduce solar energy dumped in a solar aided power generation plant

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  • Huang, Chang
  • Hou, Hongjuan
  • Hu, Eric
  • Yu, Gang
  • Chen, Si
  • Yang, Yongping

Abstract

Solar aided power generation technology has been proved to be one of the most efficient ways to integrate solar energy into a coal-fired power plant. In a typical plant, the solar field size is normally designed with a solar multiple greater than one. Therefore, sometimes collected solar heat becomes surplus when the collected solar heat exceeds the heat demand. Other than being dumped, the surplus solar heat could be either charged into a thermal energy storage system if there is one; or used to preheat (feedwater) continuously. In this paper, the impacts of these two measures (being charged and preheating continuously) on the technical and economic performances of the integrated plant are analyzed in detail by undertaking a desktop case study. The results show that both measures could reduce the surplus solar heat dumped, but the economic performances vary. For the measure of preheating continuously, the maximum solar input is determined by a safety assessment to ensure a stable and safe operation. Surplus heat over this maximum amount has to be dumped. The results also show that for the plant located in Tibet China, both measures could reduce the levelized cost of energy and enhance the effective solar-to-electricity efficiency, compared to dumping case; while continuing preheating measure is superior to being charged technically and economically.

Suggested Citation

  • Huang, Chang & Hou, Hongjuan & Hu, Eric & Yu, Gang & Chen, Si & Yang, Yongping, 2020. "Measures to reduce solar energy dumped in a solar aided power generation plant," Applied Energy, Elsevier, vol. 258(C).
    • Handle: RePEc:eee:appene:v:258:y:2020:i:c:s0306261919317933
    DOI: 10.1016/j.apenergy.2019.114106
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    References listed on IDEAS

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    2. Huang, Chang & Madonski, Rafal & Zhang, Qi & Yan, Yixian & Zhang, Nan & Yang, Yongping, 2022. "On the use of thermal energy storage in solar-aided power generation systems," Applied Energy, Elsevier, vol. 310(C).
    3. Ding, Zeyu & Hou, Hongjuan & Duan, Liqiang & Hu, Eric & Zhang, Nan & Song, Jifeng, 2022. "Performance analysis and capacity optimization of a solar aided coal-fired combined heat and power system," Energy, Elsevier, vol. 239(PB).
    4. Ding, Zeyu & Hou, Hongjuan & Duan, Liqiang & Huang, Chang & Hu, Eric & Yu, Gang & Zhang, Yumeng & Zhang, Nan, 2021. "Simulation study on a novel solar aided combined heat and power system for heat-power decoupling," Energy, Elsevier, vol. 220(C).
    5. Heng Zhang & Na Wang & Kai Liang & Yang Liu & Haiping Chen, 2021. "Research on the Performance of Solar Aided Power Generation System Based on Annular Fresnel Solar Concentrator," Energies, MDPI, vol. 14(6), pages 1-23, March.
    6. Zhang, Nan & Zhang, Yumeng & Duan, Liqiang & Hou, Hongjuan & Zhang, Hanfei & Zhou, Yong & Bao, Weiwei, 2023. "Combining integrated solar combined cycle with wind-PV plants to provide stable power: Operation strategy and dynamic performance study," Energy, Elsevier, vol. 284(C).

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