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An improved supercritical coal-fired power generation system incorporating a supplementary supercritical CO2 cycle

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  • Xu, Cheng
  • Zhang, Qiang
  • Yang, Zhiping
  • Li, Xiaosa
  • Xu, Gang
  • Yang, Yongping

Abstract

Large superheat degree of the steam bleeds from regenerative heaters as well as the large heat transfer temperature difference during the air preheating process is not thermodynamically satisfactory in advanced supercritical power plants with the aim of high power generation efficiency. In this study, an improved supercritical coal-fired power generation system, which integrates a supercritical CO2 (S-CO2) power cycle to utilize the superheat of the steam bleeds as well as to heat the combustion air, was proposed. In the proposed system, the heat transfer temperature difference within the steam regenerative trains and air preheating process could be reduced, leading to less exergy destructions. Moreover, less required heat for flue gas air heaters makes it possible to adopt a low-temperature economizer (LTE) between the arranged two-stage flue gas air heaters, saving part of the steam bleeds, even if the exhaust flue gas temperature is kept constant. The detailed exergy distributions within the regenerative heaters and air pre-heating process were discussed using the graphical exergy analysis. The mass and energy balance of the proposed system and the overall system performance were determined using the process simulation. The economic viability and the implementation feasibility of the proposed system was also analyzed. Results showed that the exergy destruction of the regenerative heaters and air preheating process could be reduced by 4.47 MW and 11.95 MW, respectively. The gross electric power output from the proposed system was 1007.79 MW with a satisfactory energy efficiency at 46.0%, 0.4 percentage point higher than the reference power plant. The payback period of the proposed system is slightly longer than that of the reference plant at the current market condition and it will be more profitable as the S-CO2 cycle becomes more commercially mature.

Suggested Citation

  • Xu, Cheng & Zhang, Qiang & Yang, Zhiping & Li, Xiaosa & Xu, Gang & Yang, Yongping, 2018. "An improved supercritical coal-fired power generation system incorporating a supplementary supercritical CO2 cycle," Applied Energy, Elsevier, vol. 231(C), pages 1319-1329.
    • Handle: RePEc:eee:appene:v:231:y:2018:i:c:p:1319-1329
    DOI: 10.1016/j.apenergy.2018.09.122
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    3. Zhang, Shunqi & Liu, Ming & Ma, Yuegeng & Liu, Jiping & Yan, Junjie, 2021. "Flexibility assessment of a modified double-reheat Rankine cycle integrating a regenerative turbine during recuperative heater shutdown processes," Energy, Elsevier, vol. 233(C).
    4. Bai, Wengang & Li, Hongzhi & Zhang, Lei & Zhang, Yifan & Yang, Yu & Zhang, Chun & Yao, Mingyu, 2021. "Energy and exergy analyses of an improved recompression supercritical CO2 cycle for coal-fired power plant," Energy, Elsevier, vol. 222(C).
    5. Pan, Lisheng & Li, Bing & Shi, Weixiu & Wei, Xiaolin, 2019. "Optimization of the self-condensing CO2 transcritical power cycle using solar thermal energy," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
    6. Sun, Yang & Wang, Ligang & Xu, Cheng & Van herle, Jan & Maréchal, François & Yang, Yongping, 2020. "Enhancing the operational flexibility of thermal power plants by coupling high-temperature power-to-gas," Applied Energy, Elsevier, vol. 263(C).
    7. Xu, Cheng & Li, Xiaosa & Xin, Tuantuan & Liu, Xin & Xu, Gang & Wang, Min & Yang, Yongping, 2019. "A thermodynamic analysis and economic assessment of a modified de-carbonization coal-fired power plant incorporating a supercritical CO2 power cycle and an absorption heat transformer," Energy, Elsevier, vol. 179(C), pages 30-45.
    8. Kim, Sunjin & Kim, Min Soo & Kim, Minsung, 2020. "Parametric study and optimization of closed Brayton power cycle considering the charge amount of working fluid," Energy, Elsevier, vol. 198(C).
    9. Lin, Xiaolong & Li, Qinlun & Wang, Lukai & Guo, Yifan & Liu, Yinhe, 2020. "Thermo-economic analysis of typical thermal systems and corresponding novel system for a 1000 MW single reheat ultra-supercritical thermal power plant," Energy, Elsevier, vol. 201(C).
    10. Cao, Lihua & Li, Xiaoli & Wang, Di, 2022. "A thermodynamic system of coal-fired power unit coupled S–CO2 energy-storage cycle," Energy, Elsevier, vol. 259(C).
    11. Yue Hu & Yachi Gao & Hui Lv & Gang Xu & Shijie Dong, 2018. "A New Integration System for Natural Gas Combined Cycle Power Plants with CO 2 Capture and Heat Supply," Energies, MDPI, vol. 11(11), pages 1-13, November.
    12. Bai, Zhang & Liu, Qibin & Gong, Liang & Lei, Jing, 2019. "Investigation of a solar-biomass gasification system with the production of methanol and electricity: Thermodynamic, economic and off-design operation," Applied Energy, Elsevier, vol. 243(C), pages 91-101.

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