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Numerical Study of the Influence of Secondary Air Uniformity on Jet Penetration and Gas-Solid Diffusion Characteristics in a Large-Scale CFB Boiler

Author

Listed:
  • Xiong Zheng

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

  • Jin Yan

    (Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education of PRC, Chongqing 400044, China
    Nanjing Institute of Technology, College of Energy and Power Engineering, Nanjing 211167, China)

  • Jinping Wang

    (Nanjing Institute of Technology, College of Energy and Power Engineering, Nanjing 211167, China
    Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China)

  • Xiaofeng Lu

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

Abstract

The uniformity of secondary air (SA) in large-scale CFB boilers has an important influence on gas-solid flow and combustion, but was seldom considered in previous studies. Numerical simulation based on the Eulerian–Eulerian and RNG k-ε turbulence models was conducted to explore the influence of SA uniformity and load variation on jet penetration, diffusion characteristics and gas-solid mixing in the first 600 MW supercritical CFB boiler. The results showed that better SA uniformity was conductive to the uniformity of SA penetration and gas-solid mixing along the furnace height, although the penetration depth and diffusion distance showed an opposite trend. In addition, the penetration depth and diffusion distance got enhanced with higher boiler load. The inner and outer SA jets could not cover the furnace width, and the uneven SA uniformity led to a huge deviation of the solid concentration within 10 m of the air distributor. Eventually, a calculation model was successfully established for predicting the penetration depth of inclined thermal SA jets during boiler operation.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5679-:d:632336
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    References listed on IDEAS

    as
    1. 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.
    2. 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.
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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.

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