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Performance analysis of coal-fired power plant with carbon capture integrated with a supercritical compressed carbon dioxide energy storage system

Author

Listed:
  • Hu, Dongzi
  • Zhao, Mingzhi
  • Zhang, Chengfeng
  • Zhu, Yilin
  • Xu, Yujie
  • Shen, Guoqing
  • Chen, Haisheng

Abstract

The application of large-scale energy storage technology is an effective approach to enhancing the flexible regulation capability of power systems. Supercritical compressed carbon dioxide energy storage (SC-CCES) technology is among the most promising methods for large-scale energy storage. This paper proposes a coupled system integrating SC-CCES with carbon capture coal-fired units. The system utilizes the S-CO2 from carbon capture coal-fired units as the working medium for the SC-CCES system, eliminating the need for a low-pressure gas storage chamber in the SC-CCES system. A thermodynamic model of the coupled system is developed, and its thermal characteristics are analyzed using a peak shaving scheme. The results indicate that the SC-CCES system enhances both the peaking flexibility and peaking depth of the coupled system compared to the carbon capture coal-fired unit alone. In pure storage mode, the coupled system can save up to 52.1 g/kWh of coal consumption during a peak shaving cycle, achieving a round-trip efficiency of 70.1 % and an energy density of 10.87 kWh/m3. When operating in electricity storage with heat storage mode, the SC-CCES system uses the reheated steam from the coal-fired unit to heat S-CO2, resulting in an energy storage efficiency of 45.49 %, an energy density of 23.1 kWh/m3, and a required high-pressure gas storage chamber volume of 851.4 m3/h. This study offers significant insights for the development of CO2-based energy storage technologies and supports the goals of ' carbon neutrality and peak carbon emissions reduction'.

Suggested Citation

  • Hu, Dongzi & Zhao, Mingzhi & Zhang, Chengfeng & Zhu, Yilin & Xu, Yujie & Shen, Guoqing & Chen, Haisheng, 2025. "Performance analysis of coal-fired power plant with carbon capture integrated with a supercritical compressed carbon dioxide energy storage system," Energy, Elsevier, vol. 336(C).
    • Handle: RePEc:eee:energy:v:336:y:2025:i:c:s0360544225039842
    DOI: 10.1016/j.energy.2025.138342
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    1. Chen, Lei & Chen, Yong & Xu, Kai & Wu, Runzhou & Deng, Wei & Xu, Jun & Jiang, Long & Su, Sheng & Hu, Song & Xiang, Jun, 2026. "Thermodynamic and economic analysis of supercritical compressed carbon dioxide energy storage system integrated with steam cycle for flexible operation of power plant," Renewable Energy, Elsevier, vol. 257(C).

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