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Mid and low-temperature solar–coal hybridization mechanism and validation

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

Abstract

A higher solar-to-electricity conversion efficiency was one of the major advantages of the solar-fossil hybrid systems, compared to the solar-only power plants. In this paper, a new mechanism to reveal the reasons for the improved solar-to-electricity efficiency in a solar-hybrid power plant was given. A correlation was built to describe the main influencing factors of its thermodynamic performances, including higher collector efficiency, higher turbine internal efficiency and upgraded energy level of the mid and low-temperature solar heat. This proposed mechanism can be used to integrate solar–coal hybridization system effectively. A case study was taken as the typical 200 MW coal-fired power plant hybridized with solar heat at approximately 300 °C, where the solar heat was used to preheat the feed water before entering the boiler. Furthermore, simulation results of this mid and low-temperature solar-hybridization system was conducted to prove the proposed mechanism. It is expected that the theoretical values have a good agreement with the simulation ones. The results obtained indicate that why development of mid and low-temperature solar–coal hybridization technology may provide a promising direction to efficient utilization of low-grade solar thermal energy, and provide the direction to enhance system performances of this kind of solar–coal hybrid power plants.

Suggested Citation

  • Zhao, Yawen & Hong, Hui & Jin, Hongguang, 2014. "Mid and low-temperature solar–coal hybridization mechanism and validation," Energy, Elsevier, vol. 74(C), pages 78-87.
    • Handle: RePEc:eee:energy:v:74:y:2014:i:c:p:78-87
    DOI: 10.1016/j.energy.2014.03.092
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    Cited by:

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    5. Burin, Eduardo Konrad & Buranello, Leonardo & Giudice, Pedro Lo & Vogel, Tobias & Görner, Klaus & Bazzo, Edson, 2015. "Boosting power output of a sugarcane bagasse cogeneration plant using parabolic trough collectors in a feedwater heating scheme," Applied Energy, Elsevier, vol. 154(C), pages 232-241.
    6. Powell, Kody M. & Rashid, Khalid & Ellingwood, Kevin & Tuttle, Jake & Iverson, Brian D., 2017. "Hybrid concentrated solar thermal power systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 215-237.
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    8. Jun Zhao & Kun Yang, 2020. "Allocating Output Electricity in a Solar-Aided Coal-Fired Power Generation System and Assessing Its CO 2 Emission Reductions in China," Sustainability, MDPI, vol. 12(2), pages 1-15, January.

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