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Optimization of Fluidization State of a Circulating Fluidized Bed Boiler for Economical Operation

Author

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  • Xuemin Liu

    (China Special Equipment Inspection and Research Institute, Beijing 100029, China
    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China)

  • Hairui Yang

    (Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China)

  • Junfu Lyu

    (Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China)

Abstract

To reduce the auxiliary power consumption and improve the reliability of large-scale circulating fluidized bed (CFB) boilers, we developed energy-saving CFB combustion technology based on the fluidization state re-specification. A calculation model of coal comminution energy consumption was used to analyze the change in comminution energy consumption, and a 1D CFB combustion model was modified to predict the operation parameters under the fluidization state optimization conditions. With a CFB boiler of 480 t/h, the effect of fluidization state optimization on the economical operation was analyzed using the above two models. We found that combustion efficiency presents a nonmonotonic trend with the change in the bed pressure drop and feeding coal size. There are an optimal bed pressure drop and a corresponding feeding coal size distribution, under which the net coal consumption is the lowest. Low bed pressure drop operation achieved by reducing the coal particle size is not beneficial to SO 2 and NO x emission control, and the pollutant control cost increases. The effect of fluidization state optimization on the gross cost of power supply can be calculated, and the optimal bed pressure drop can be obtained.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:2:p:376-:d:308051
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    References listed on IDEAS

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    1. Adamczyk, Wojciech P. & Myöhänen, Kari & Hartge, Ernst-Ulrich & Ritvanen, Jouni & Klimanek, Adam & Hyppänen, Timo & Białecki, Ryszard A., 2018. "Generation of data sets for semi-empirical models of circulated fluidized bed boilers using hybrid Euler-Lagrange technique," Energy, Elsevier, vol. 143(C), pages 219-240.
    2. Wang, Qinhui & Luo, Zhongyang & Li, Xuantian & Fang, Mengxiang & Ni, Mingjiang & Cen, Kefa, 1999. "A mathematical model for a circulating fluidized bed (CFB) boiler," Energy, Elsevier, vol. 24(7), pages 633-653.
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    Cited by:

    1. Xueshen Wang & Zheng Gan & Shengwei Xin & Chunzhen Yang, 2023. "Study on Gas–Solid Two–Phase Flow Characteristics of One–Furnace with Two–Tower Semi–Dry Desulfurization in Circulating Fluidized Bed Boiler," Energies, MDPI, vol. 16(4), pages 1-13, February.
    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.
    3. 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.
    4. Boyu Deng & Tuo Zhou & Shuangming Zhang & Haowen Wu & Xiaoguo Jiang & Man Zhang & Hairui Yang, 2022. "Safety Analysis on the Heating Surfaces in the 660 MW Ultra-Supercritical CFB Boiler under Sudden Electricity Failure," Energies, MDPI, vol. 15(21), pages 1-15, October.
    5. 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.
    6. 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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