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Design and performance analysis of coal-fired fluidized bed for supercritical CO2 power cycle

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  • Liu, Xuejiao
  • Zhong, Wenqi
  • Li, Pingjiao
  • Xiang, Jun
  • Liu, Guoyao

Abstract

A coal-fired circulating fluidized bed (CFB) boiler for 600 MW power plant is designed to integrate with the supercritical CO2 (SCO2) power cycle in this study. The boiler configuration, heating surface arrangement and regulation analysis were figured out based on the First Law of Thermodynamics and the basic rules of heat transfer. Compared to typical water steam CFB boilers, the SCO2 CFB boiler as a superheater unit in essence contains the simpler configuration with less heating components. More than 40% of heating surfaces for working fluid needs to be arranged in the furnace and external heat exchangers and 80% of the heat absorption of SCO2 comes from such regions of high-temperature heat resource, while only 20% comes from the backpass with the aim to recover flue gas heat. The relative low furnace temperature in CFB boiler (about 900 °C) greatly reduces the stress on the residual flue gas heat extraction and the exhaust flue gas could be cooled to 129 °C by just setting the split SCO2 flow (∼5%) preheater in backpass and doubling the area of air preheater, with which the primary air being heated up to 490 °C. The commonly used working fluid temperature regulation methods such as the spray desuperheating and adjusting external solid circulation were evaluated and proved to be still effective in the SCO2 CFB boiler.

Suggested Citation

  • Liu, Xuejiao & Zhong, Wenqi & Li, Pingjiao & Xiang, Jun & Liu, Guoyao, 2019. "Design and performance analysis of coal-fired fluidized bed for supercritical CO2 power cycle," Energy, Elsevier, vol. 176(C), pages 468-478.
    • Handle: RePEc:eee:energy:v:176:y:2019:i:c:p:468-478
    DOI: 10.1016/j.energy.2019.03.170
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    References listed on IDEAS

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    Cited by:

    1. Liu, Zecheng & Zhong, Wenqi & Liu, Xuejiao & Shao, Yingjuan, 2023. "Techno-economic and environmental evaluation of a supercritical CO2 coal-fired circulating fluidized bed boiler power generation," Energy, Elsevier, vol. 285(C).
    2. 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).
    3. Li, Zhaozhi & Shao, Yingjuan & Zhong, Wenqi & Liu, Hao, 2023. "Optimal design and thermodynamic evaluation of supercritical CO2 oxy-coal circulating fluidized bed power generation systems," Energy, Elsevier, vol. 277(C).
    4. Zhu, Meng & Zhou, Jing & Chen, Lei & Su, Sheng & Hu, Song & Qing, Haoran & Li, Aishu & Wang, Yi & Zhong, Wenqi & Xiang, Jun, 2022. "Economic analysis and cost modeling of supercritical CO2 coal-fired boiler based on global optimization," Energy, Elsevier, vol. 239(PD).
    5. Wang, Shengpeng & Zhang, Yifan & Li, Hongzhi & Yao, Mingyu & Peng, Botao & Yan, Junjie, 2020. "Thermohydrodynamic analysis of the vertical gas wall and reheat gas wall in a 300 MW supercritical CO2 boiler," Energy, Elsevier, vol. 211(C).
    6. Liu, Zecheng & Zhong, Wenqi & Shao, Yingjuan & Liu, Xuejiao, 2022. "Conceptual design of a small-capacity supercritical CO2 coal-fired circulating fluidized bed boiler by an improved design calculation method," Energy, Elsevier, vol. 255(C).
    7. Zhou, Jing & Zhu, Meng & Xu, Kai & Su, Sheng & Tang, Yifang & Hu, Song & Wang, Yi & Xu, Jun & He, Limo & Xiang, Jun, 2020. "Key issues and innovative double-tangential circular boiler configurations for the 1000 MW coal-fired supercritical carbon dioxide power plant," Energy, Elsevier, vol. 199(C).
    8. Kim, Hyung Woo & Seo, Su Been & Kang, Seo Yeong & Go, Eun Sol & Oh, Seung Seok & Lee, YongWoon & Yang, Won & Lee, See Hoon, 2021. "Effect of flue gas recirculation on efficiency of an indirect supercritical CO2 oxy-fuel circulating fluidized bed power plant," Energy, Elsevier, vol. 227(C).
    9. Liu, Zecheng & Zhong, Wenqi & Shao, Yingjuan & Liu, Xuejiao, 2020. "Exergy analysis of supercritical CO2 coal-fired circulating fluidized bed boiler system based on the combustion process," Energy, Elsevier, vol. 208(C).

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    Keywords

    Supercritical CO2; Boiler design; CFB; Thermal calculation;
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