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Study on Dynamic Characteristics of Residual Char of CFB Boiler Based on CPFD Method

Author

Listed:
  • Xin Shen

    (College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Li Jia

    (College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Yanlin Wang

    (College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Baihe Guo

    (College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Haodong Fan

    (College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Xiaolei Qiao

    (College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Man Zhang

    (State Key Lab of Power Systems, Tsinghua University, Beijing 100083, China)

  • Yan Jin

    (College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract

When the load of Circulating Fluidized Bed (CFB) boiler changes dynamically, the accumulation and consumption of residual char causes a large inertia and hysteresis in the boiler combustion system. Therefore, accurate estimation of the residual char in the boiler is of great significance to the control system and improve the combustion efficiency. Based on the Computational Particles Fluid Dynamics (CPFD) method, a numerical simulation of the variable load process of CFB boiler was carried out, and the dynamic changes of the residual char inventory were analyzed by combining the coal feed, ash discharge, and furnace calorific value. The results showed that after CFB boiler reached stable operation, the residual char fluctuated from 11,000 kg to 16,000 kg, accounting for about 3.7% of the total bed material, and the residual char was in a dynamic balance. During the load-up phase, the average residual char was 17,500 kg, and during the load-down phase, the average residual char was 15,000 kg. In the process of load dynamic change, reasonable residual char stock can ensure the boiler load from one steady state to another steady state rapid transition.

Suggested Citation

  • Xin Shen & Li Jia & Yanlin Wang & Baihe Guo & Haodong Fan & Xiaolei Qiao & Man Zhang & Yan Jin, 2020. "Study on Dynamic Characteristics of Residual Char of CFB Boiler Based on CPFD Method," Energies, MDPI, vol. 13(22), pages 1-24, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:22:p:5883-:d:443128
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    References listed on IDEAS

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    1. Wang, Wei & Jing, Sitong & Sun, Yang & Liu, Jizhen & Niu, Yuguang & Zeng, Deliang & Cui, Can, 2019. "Combined heat and power control considering thermal inertia of district heating network for flexible electric power regulation," Energy, Elsevier, vol. 169(C), pages 988-999.
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    Cited by:

    1. Boyu Deng & Yi Zhang & Hairui Yang, 2022. "Operation Optimization of Circulating Fluidized Bed Boilers Integration of Variable Renewables," Energies, MDPI, vol. 15(16), pages 1-3, August.
    2. Aleksandra V. Varganova & Vadim R. Khramshin & Andrey A. Radionov, 2023. "Operating Modes Optimization for the Boiler Units of Industrial Steam Plants," Energies, MDPI, vol. 16(6), pages 1-14, March.

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