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The energy-saving mechanism of coal-fired power plant with S–CO2 cycle compared to steam-Rankine cycle

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  • Chen, Zhewen
  • Wang, Yanjuan
  • Zhang, Xiaosong
  • Xu, Jinliang

Abstract

S–CO2 (Supercritical-CO2) coal-fired power plant is a promising technology for efficient and clean utilization of coal for power generation. The comparative study between the S–CO2 coal-fired power plant and the power plant with steam Rankine cycle from aspects of energy and exergy balances is conducted. The conversion and transfer of the energy and exergy in the power plants are revealed. With the main gas parameters of 32MPa/620 °C and double-reheat process, the power generation efficiencies of the S–CO2 coal-fired power plant and the power plant with steam Rankine cycle are 49.06% and 48.12%, respectively. The corresponding exergy efficiencies are 48.02% and 47.10%, respectively. The energy-saving mechanism of the S–CO2 coal-fired power plant is revealed: the smaller boiler efficiency and larger exergy efficiency of the boiler system in the S–CO2 coal-fired power plant make the energy level of the energy being transferred to the S–CO2 cycle is higher than that of the energy being transported to the Rankine cycle. The CO2 absorbs the high-level energy and produces more mechanical power through the S–CO2 cycle to obtain higher power efficiency.

Suggested Citation

  • Chen, Zhewen & Wang, Yanjuan & Zhang, Xiaosong & Xu, Jinliang, 2020. "The energy-saving mechanism of coal-fired power plant with S–CO2 cycle compared to steam-Rankine cycle," Energy, Elsevier, vol. 195(C).
    • Handle: RePEc:eee:energy:v:195:y:2020:i:c:s0360544220300724
    DOI: 10.1016/j.energy.2020.116965
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    2. Wang, Di & Xie, Xinyan & Wang, Chaonan & Zhou, Yunlong & Yang, Mei & Li, Xiaoli & Liu, Deying, 2021. "Thermo-economic analysis on an improved coal-fired power system integrated with S–CO2 brayton cycle," Energy, Elsevier, vol. 220(C).
    3. Xiao, Kun & Yu, Bolin & Cheng, Lei & Li, Fei & Fang, Debin, 2022. "The effects of CCUS combined with renewable energy penetration under the carbon peak by an SD-CGE model: Evidence from China," Applied Energy, Elsevier, vol. 321(C).
    4. Zhang, Xuelei & Zhang, Zhuoyuan & Wang, Gaofeng, 2023. "Thermodynamic and economic investigation of a novel combined cycle in coal-fired power plant with CO2 capture via Ca-looping," Energy, Elsevier, vol. 263(PB).
    5. Chen, Zhewen & Wang, Yanjuan & Zhang, Xiaosong, 2020. "Energy and exergy analyses of S–CO2 coal-fired power plant with reheating processes," Energy, Elsevier, vol. 211(C).
    6. Mei, Weiguang & Zhai, Rongrong & Zhao, Yingxin & Yao, Zhiqiang & Ma, Ning, 2024. "Exergoeconomic analysis and multi-objective optimization using NSGA-II in a novel dual-stage Selexol process of integrated gasification combined cycle," Energy, Elsevier, vol. 286(C).

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