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Study on the Effect of Secondary Air Layout on CO Reduction Performance in a 75 t/h Biomass CFB Boiler Burning Wheat Straw

Author

Listed:
  • Jun Zhang

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

  • Yanmin Li

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

  • Lin Mei

    (Key Laboratory of Electromechanical Equipment Security in Western Complex Environment for State Market Regulation, Chongqing 401121, China
    Chongqing Special Equipment Inspection and Research Institute, Chongqing 401121, China)

  • Xiaoliang Yu

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

  • Xun Lv

    (Xizi Clean Energy Equipment Manufacturing Co., Ltd., Hangzhou 310021, China)

  • Jinping Wang

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

  • 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)

  • Rongyue Sun

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

Abstract

Biomass fuels play an important role in the field of fluidized bed combustion, but due to the diversity and uncertainty of fuels, there are usually some problems of high CO emission that cannot be directly solved by combustion adjustment. In this paper, a 75 t/h biomass fluidized bed was taken as the research object. It was observed from the field test that the gas incomplete combustion loss reached 12.13% when mono-combustion of wheat straw was conducted, and the CO concentration in the exhaust gas exceeded 30k ppm. Combined with the CPFD numerical simulation, the combustion characteristics and influence of secondary air layout on CO reduction performance were discussed in detail. The results revealed that the gas temperature gradually increased along furnace height under the initial condition, and the maximum temperature was more than 1000 °C at furnace outlet. The air curtain of the secondary air jets was insufficient, and the wheat straw rose rapidly as it entered into the furnace. By arranging adjacent secondary air ports above each fuel-feeding inlet, the residence time of particles in the furnace could be significantly increased, thus, the furnace temperature distribution was more reasonable and the CO emission was reduced by 58.6%.

Suggested Citation

  • Jun Zhang & Yanmin Li & Lin Mei & Xiaoliang Yu & Xun Lv & Jinping Wang & Jin Yan & Rongyue Sun, 2023. "Study on the Effect of Secondary Air Layout on CO Reduction Performance in a 75 t/h Biomass CFB Boiler Burning Wheat Straw," Energies, MDPI, vol. 16(8), pages 1-15, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:8:p:3312-:d:1118374
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    References listed on IDEAS

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    1. Morris, Jonathan D. & Daood, Syed Sheraz & Nimmo, William, 2022. "The use of kaolin and dolomite bed additives as an agglomeration mitigation method for wheat straw and miscanthus biomass fuels in a pilot-scale fluidized bed combustor," Renewable Energy, Elsevier, vol. 196(C), pages 749-762.
    2. Cheng, Guishi & Zhao, Ying & Pan, Shijiu & Wang, Xiaoqiang & Dong, Changqing, 2020. "A comparative life cycle analysis of wheat straw utilization modes in China," Energy, Elsevier, vol. 194(C).
    3. Li, Shenghui & Sun, Xiaojing & Liu, Linlin & Du, Jian, 2023. "A full process optimization of methanol production integrated with co-generation based on the co-gasification of biomass and coal," Energy, Elsevier, vol. 267(C).
    4. Shengwei Xin & Hu Wang & Jianbo Li & Gang Wang & Quanhai Wang & Peiqing Cao & Peng Zhang & Xiaofeng Lu, 2022. "Discussion on the Feasibility of Deep Peak Regulation for Ultra-Supercritical Circulating Fluidized Bed Boiler," Energies, MDPI, vol. 15(20), pages 1-12, October.
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