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Proposal and investigation of a high-efficiency coal-fired power generation system enabled by chemical recuperative supercritical water coal gasification

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  • Xue, Xiaodong
  • Liu, Changchun
  • Han, Wei
  • Wang, Zefeng
  • Zhang, Na
  • Jin, Hongguang
  • Wang, Xiaodong

Abstract

Gasification process is a promising technology for efficient and clean utilization of solid fuels that has been attracting increasing attention. This paper proposes a high-efficiency coal-fired power generation system enabled by chemical recuperative supercritical water coal gasification. The main feature is that the reaction heat of gasification process is supplied by the high-temperature flue gas generated by the gas turbine, which can be achieved by adjusting the pressure ratio. Since coal can be converted into clean syngas with supercritical water at 600–700 °C without the oxidation of part of the fuel to provide reaction heat, the exergy destruction of gasification process is decreased dramatically and a small amount of chemical energy of coal is converted into thermal energy. The results showed that in the proposed system and reference system, the net power generation efficiencies are 53.8% and 48.9%, respectively; and the corresponding exergy efficiencies are 52.5% and 47.7%, respectively. It is observed that in the proposed system, the net power generation and exergy efficiencies increased by 4.9 and 4.8% points, respectively. Additionally, the mechanism of exergy destruction reduction is revealed by the graphical exergy analysis, and the comprehensive cascade utilization of chemical and thermal energy is realized.

Suggested Citation

  • Xue, Xiaodong & Liu, Changchun & Han, Wei & Wang, Zefeng & Zhang, Na & Jin, Hongguang & Wang, Xiaodong, 2023. "Proposal and investigation of a high-efficiency coal-fired power generation system enabled by chemical recuperative supercritical water coal gasification," Energy, Elsevier, vol. 267(C).
    • Handle: RePEc:eee:energy:v:267:y:2023:i:c:s0360544222034855
    DOI: 10.1016/j.energy.2022.126598
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    References listed on IDEAS

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