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Experimental Investigations on Lateral Dispersion Coefficients of Fuel Particles in Large-Scale Circulating Fluidized Bed Boilers with Different Coal Feeding Modes

Author

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  • Jin Yan

    (College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
    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)

  • Xiong Zheng

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

  • Rui Xue

    (College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China)

  • Xiujian Lei

    (Sichuan Baima CFB Demonstration Power Plant Co. Ltd., Neijiang 641005, China)

  • Xuchen Fan

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

  • Shirong Liu

    (Datang Wu’an Power Plant Co. Ltd., Handan 056300, China)

Abstract

The dispersion characteristics of fuel particles over the bed have always been a key consideration in the design of fluidized beds. However, the lateral fuel dispersion coefficients ( D sr ) reported in the previous literature widely ranged from 10 −4 to 10 −1 m 2 /s, which were hard to be directly applied in large-scale CFB (circulating fluidized bed) boilers with wider bed width (close to 30 m) and variable coal feeding modes. To solve this problem, field tests were conducted on the first 600 MW CFB boiler in this paper, and the distributions of flue gas composition and flue gas temperature were obtained near the coal feeding port under four working conditions. The dispersion characteristics of fuel particles were analyzed in detail combined with the dispersion model. In addition, a new method based on bed heat balance was also proposed to estimate D sr and applied in a 300 MW CFB boiler with a different coal feeding mode. The results revealed that D sr through the local heat balance method ranged from 0.10–0.35 m 2 /s, which were 9–18% higher than the values through the dispersion model. Compared with the coal feeding port immersed in the bed, D sr of the fuel particles fed into the splash zone increased by about 34.7%. D sr under the coal feeding mode of a screw feeder with pressurized air ranged from 0.12–0.16 m 2 /s, which were lower than D sr under the coal feeding method of importing fuel into circulating ash. The method and results in this paper could expand the applicability of fuel dispersion, and provide the most direct guidance for the design and optimization of coal feeding ports in large-scale CFB boilers.

Suggested Citation

  • Jin Yan & Xiaofeng Lu & Xiong Zheng & Rui Xue & Xiujian Lei & Xuchen Fan & Shirong Liu, 2020. "Experimental Investigations on Lateral Dispersion Coefficients of Fuel Particles in Large-Scale Circulating Fluidized Bed Boilers with Different Coal Feeding Modes," Energies, MDPI, vol. 13(23), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:23:p:6336-:d:454359
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    References listed on IDEAS

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    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. 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. Jin Yan & Xiaofeng Lu & Changfei Zhang & Qianjun Li & Jinping Wang & Shirong Liu & Xiong Zheng & Xuchen Fan, 2021. "An Experimental Study on the Characteristics of NO x Distributions at the SNCR Inlets of a Large-Scale CFB Boiler," Energies, MDPI, vol. 14(5), pages 1-15, February.
    2. Xiong Zheng & Jin Yan & Jinping Wang & Xiaofeng Lu, 2021. "Numerical Study of the Influence of Secondary Air Uniformity on Jet Penetration and Gas-Solid Diffusion Characteristics in a Large-Scale CFB Boiler," Energies, MDPI, vol. 14(18), pages 1-19, September.

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