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Study on the Uniformity of Secondary Air of a 660 MW Ultra-Supercritical CFB Boiler

Author

Listed:
  • Li Nie

    (Dongfang Boiler Group Co., Ltd., Chengdu 611731, China)

  • Jiayi Lu

    (Dongfang Boiler Group Co., Ltd., Chengdu 611731, China)

  • Qigang Deng

    (Dongfang Boiler Group Co., Ltd., Chengdu 611731, China)

  • Liming Gong

    (Dongfang Boiler Group Co., Ltd., Chengdu 611731, China)

  • Dayong Xue

    (Dongfang Boiler Group Co., Ltd., Chengdu 611731, China)

  • Zhongzhi Yang

    (Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, Chongqing University, Chongqing 400044, China)

  • Xiaofeng Lu

    (Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, Chongqing University, Chongqing 400044, China)

Abstract

Based on the field test of a 600 MW supercritical circulating-fluidized bed boiler, this paper optimizes the secondary air pipe layout scheme of a 660 MW ultra-supercritical circulating fluidized bed boiler with a similar furnace structure and carried out a numerical simulation on its air distribution uniformity. The secondary air box of the 660 MW ultra-supercritical circulating-fluidized bed boiler adopts a variable section design, and the secondary air branch pipe adopts a separate air inlet mode. The experimental results showed that the oxygen concentration was uniform near the rear wall, but all exhibited a “decrease–increase–decrease” profile along the horizontal line, which indicated that the trajectory of the secondary air jet was first in the shape of bending downward and then upward. To achieve a more uniform secondary air distribution for supercritical CFB boilers, further optimization of the layout of the bellows and branch pipes should be considered. Numerical results showed that the deviation rate of the internal and lower secondary air reached 17%, and there was optimization space for the secondary air branch pipe layout of the boiler. Its uniformity can be increased by adding valves and other measures. The velocity deviation of the secondary air of the 660 MW ultra-supercritical circulating-fluidized bed boiler can be within 3% by means of separate air supply and pipe diameter change, and better uniform air supply can be achieved to reduce the speed deviation by adding valves and adjusting the combustion.

Suggested Citation

  • Li Nie & Jiayi Lu & Qigang Deng & Liming Gong & Dayong Xue & Zhongzhi Yang & Xiaofeng Lu, 2022. "Study on the Uniformity of Secondary Air of a 660 MW Ultra-Supercritical CFB Boiler," Energies, MDPI, vol. 15(10), pages 1-12, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3604-:d:815840
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    References listed on IDEAS

    as
    1. Junjie Lin & Kun Luo & Shuai Wang & Liyan Sun & Jianren Fan, 2020. "Particle-Scale Simulation of Solid Mixing Characteristics of Binary Particles in a Bubbling Fluidized Bed," Energies, MDPI, vol. 13(17), pages 1-19, August.
    2. Yimin Deng & Renaud Ansart & Jan Baeyens & Huili Zhang, 2019. "Flue Gas Desulphurization in Circulating Fluidized Beds," Energies, MDPI, vol. 12(20), pages 1-19, October.
    3. Xuemin Liu & Hairui Yang & Junfu Lyu, 2020. "Optimization of Fluidization State of a Circulating Fluidized Bed Boiler for Economical Operation," Energies, MDPI, vol. 13(2), pages 1-20, January.
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    Cited by:

    1. Yingai Jin & Yanwei Sun & Yuanbo Zhang & Zhipeng Jiang, 2022. "Research on Air Distribution Control Strategy of Supercritical Boiler," Energies, MDPI, vol. 16(1), pages 1-19, December.
    2. Guo Li & Xiangyu Tao & Zonglong Zhang & Chen Yang & Qigang Deng & Li Nie & Wei He & Weicheng Li & Jiayi Lu & Liming Gong, 2023. "Dynamic Simulation of MFT and BT Processes on a 660 MW Ultra-Supercritical Circulating Fluidized Bed Boiler," Energies, MDPI, vol. 16(5), pages 1-13, February.
    3. 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.

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