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Operation characteristics of a bubbling fluidized bed heat exchanger with internal solid circulation for a 550-MWe ultra-supercritical CFB boiler

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  • Li, Dongfang
  • Cai, Runxia
  • Zhang, Man
  • Yang, Hairui
  • Choi, Kyeong
  • Ahn, Seokgi
  • Jeon, Chung-Hwan

Abstract

The world first 550-MWe ultra-supercritical circulating fluidized bed (CFB) boiler is designed with integrated recycle heat exchangers (INTREX) and internal solid circulation. In this research, in order to investigate the heat transfer behavior and the significance of the internal circulation, the operation characteristics of the four INTREXes as final superheaters including heat transfer coefficients and ash flow rates under different load conditions are experimentally studied. The calculation of ash circulating rate shows that as the boiler load decreases, the furnace bed temperature and the circulating ash temperature in the loop seal decrease, while the flow rate of the internal circulation and its proportion to the total solid flux increase as the boiler load decreases. In particular, under 60% load condition, the internal flow rate is found to be higher than that of external flow rate for the two INTREXes located in front of the middle sections of the furnace. This indicates that the internal circulation is of more significance in the low-load condition than in the high-load condition. The key factor determining the internal-circulation flow rate is found to be the bed pressure drop in the furnace. The phenomenon of non-uniform distribution of solid flux among INTREXes is also discussed.

Suggested Citation

  • Li, Dongfang & Cai, Runxia & Zhang, Man & Yang, Hairui & Choi, Kyeong & Ahn, Seokgi & Jeon, Chung-Hwan, 2020. "Operation characteristics of a bubbling fluidized bed heat exchanger with internal solid circulation for a 550-MWe ultra-supercritical CFB boiler," Energy, Elsevier, vol. 192(C).
    • Handle: RePEc:eee:energy:v:192:y:2020:i:c:s036054421932198x
    DOI: 10.1016/j.energy.2019.116503
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    References listed on IDEAS

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    1. Blaszczuk, Artur & Pogorzelec, Michal & Shimizu, Tadaaki, 2018. "Heat transfer characteristics in a large-scale bubbling fluidized bed with immersed horizontal tube bundles," Energy, Elsevier, vol. 162(C), pages 10-19.
    2. Bolea, Irene & Romeo, Luis M. & Pallarés, David, 2012. "The role of external heat exchangers in oxy-fuel circulating fluidized bed," Applied Energy, Elsevier, vol. 94(C), pages 215-223.
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    2. Xiandong Liu & Man Zhang & Shuangming Zhang & Yi Ding & Zhong Huang & Tuo Zhou & Hairui Yang & Guangxi Yue, 2022. "Measuring Technologies for CFB Solid Circulation Rate: A Review and Future Perspectives," Energies, MDPI, vol. 15(2), pages 1-15, January.
    3. Hong, Feng & Chen, Jiyu & Wang, Rui & Long, Dongteng & Yu, Haoyang & Gao, Mingming, 2021. "Realization and performance evaluation for long-term low-load operation of a CFB boiler unit," Energy, Elsevier, vol. 214(C).
    4. Li, Dongfang & Kim, Kyeongho & Kim, Minwoo & Zeng, Yijie & Yang, Zhongzhi & Lee, Sangho & Lu, Xiaofeng & Jeon, Chung-Hwan, 2021. "Effects of particle size on bed-to-surface heat transfer in bubbling fluidized bed heat exchangers of 550 MWe ultra-supercritical CFB boiler," Energy, Elsevier, vol. 222(C).
    5. Artur Blaszczuk & Szymon Jagodzik, 2021. "Investigation of Heat Transfer in a Large-Scale External Heat Exchanger with Horizontal Smooth Tube Bundle," Energies, MDPI, vol. 14(17), pages 1-24, September.
    6. Li, Dongfang & Qu, Xiaoxiao & Li, Junjie & Hong, Suck Won & Jeon, Chung-hwan, 2022. "Microstructural development of product layer during limestone sulfation and its relationship to agglomeration in large-scale CFB boiler," Energy, Elsevier, vol. 238(PC).
    7. Li, Dongfang & Ke, Xiwei & Zhang, Man & Yang, Hairui & Jung, Sungmook & Ahn, Seokgi & Jeon, Chung-Hwan, 2020. "A comprehensive mass balance model of a 550 MWe ultra-supercritical CFB boiler with internal circulation," Energy, Elsevier, vol. 206(C).
    8. Wu, Congcong & Yang, Haitao & He, Xiaohei & Hu, Chaoquan & Yang, Le & Li, Hongtao, 2022. "Principle, development, application design and prospect of fluidized bed heat exchange technology: Comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 157(C).
    9. Jun Li & Lixian Wang & Yong Chi & Zhaozhi Zhou & Yuanjun Tang & Hui Zhang, 2021. "Life Cycle Assessment of Advanced Circulating Fluidized Bed Municipal Solid Waste Incineration System from an Environmental and Exergetic Perspective," IJERPH, MDPI, vol. 18(19), pages 1-16, October.

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