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Thermodynamic mechanism for hybridization of moderate-temperature solar heat with conventional fossil-fired power plant

Author

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  • Zhao, Yawen
  • Hong, Hui
  • Jin, Hongguang
  • Li, Peiwen

Abstract

The objective of this study is to achieve a higher solar-to-electricity conversion efficiency through solar-fossil hybrid thermal power systems compared to a solar-only power plant. The study reveals the thermodynamic details for the improved solar-to-electricity efficiency in a solar hybrid power plant. A correlation was established to describe the main factors influencing the thermodynamic performances, including higher collector efficiency, higher turbine efficiency and upgraded energy level of the moderate-temperature solar heat. This proposed mechanism can be applied to effectively integrate solar and fossil-fired energy in a power system. The studies took typical fossil-fired power plants to hybridize with solar heat in three approaches: preheating the feed water before it entering the boiler for coal-fired system; heating for generation of saturate steam or superheated steam in gas-fired combined cycle. The results indicate that the moderate-temperature solar and fossil hybridization technology can provide a promising direction for efficient utilization of low-grade solar heat.

Suggested Citation

  • Zhao, Yawen & Hong, Hui & Jin, Hongguang & Li, Peiwen, 2017. "Thermodynamic mechanism for hybridization of moderate-temperature solar heat with conventional fossil-fired power plant," Energy, Elsevier, vol. 133(C), pages 832-842.
    • Handle: RePEc:eee:energy:v:133:y:2017:i:c:p:832-842
    DOI: 10.1016/j.energy.2017.05.069
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    Cited by:

    1. Li, Chao & Zhai, Rongrong & Yang, Yongping & Patchigolla, Kumar & Oakey, John E. & Turner, Peter, 2019. "Annual performance analysis and optimization of a solar tower aided coal-fired power plant," Applied Energy, Elsevier, vol. 237(C), pages 440-456.
    2. Jiang, Yue & Duan, Liqiang & Pang, Liping & Song, Jifeng, 2021. "Thermal performance study of tower solar aided double reheat coal-fired power generation system," Energy, Elsevier, vol. 230(C).
    3. Tilahun, Fitsum Bekele & Bhandari, Ramchandra & Mamo, Mengesha, 2019. "Design optimization and control approach for a solar-augmented industrial heating," Energy, Elsevier, vol. 179(C), pages 186-198.
    4. Li, Yong & Wang, Yanhong & Cao, Lihua & Hu, Pengfei & Han, Wei, 2018. "Modeling for the performance evaluation of 600 MW supercritical unit operating No.0 high pressure heater," Energy, Elsevier, vol. 149(C), pages 639-661.
    5. Li, Chao & Yang, Zhiping & Zhai, Rongrong & Yang, Yongping & Patchigolla, Kumar & Oakey, John E., 2018. "Off-design thermodynamic performances of a solar tower aided coal-fired power plant for different solar multiples with thermal energy storage," Energy, Elsevier, vol. 163(C), pages 956-968.
    6. Han, Yu & Sun, Yingying & Wu, Junjie, 2020. "An efficient solar-aided waste heat recovery system based on steam ejector and WTA pre-drying in solar/lignite hybrid power plants," Energy, Elsevier, vol. 208(C).
    7. Wang, Jianxing & Duan, Liqiang & Yang, Yongping & Yang, Zhiping & Yang, Laishun, 2019. "Study on the general system integration optimization method of the solar aided coal-fired power generation system," Energy, Elsevier, vol. 169(C), pages 660-673.

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