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Numerical Study on Effect of Flue Gas Recirculation and Co-Firing with Biomass on Combustion Characteristics in Octagonal Tangentially Lignite-Fired Boiler

Author

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  • Jiajun Du

    (Shenhua Group CFB Technology R&D Center, CFB Research and Development Department (R&D), Xi’an 710065, China)

  • Jiahui Yang

    (State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Yonggang Zhao

    (Shenhua Group CFB Technology R&D Center, CFB Research and Development Department (R&D), Xi’an 710065, China)

  • Qianxin Guo

    (Shenhua Group CFB Technology R&D Center, CFB Research and Development Department (R&D), Xi’an 710065, China)

  • Yaodong Da

    (State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    China Special Equipment Inspection and Research Institute, Beijing 100029, China)

  • Defu Che

    (State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

The octagonal tangentially fired boiler can be utilized for burning lignite with high moisture. Co-firing biomass in an octagonal tangential boiler is considered a promising approach. A numerical simulation is carried out in this study to analyze the impact of flue gas recirculation (FGR) and the biomass blending ratio on heat and mass transfer in an octagonal tangentially fired boiler. When the FGR rate increases from 0 to 30%, the maximum temperature in the boiler decreases from 2162.8 to 2106.5 K. Simultaneously, the average temperature of the center longitudinal section decreases from 1589.0 to 1531.9 K. The maximum fluctuation of the outlet flue gas temperature remains within 10.9 K for the four calculated working conditions. Consequently, the efficiency of the boiler is basically unchanged. However, the flue gas temperature at the furnace outlet decreases significantly from 1605.9 to 1491.9 K. When the biomass blending ratio increases from 0 to 20%, the mean temperature of the primary combustion zone decreases from 1600.5 to 1571.2 K.

Suggested Citation

  • Jiajun Du & Jiahui Yang & Yonggang Zhao & Qianxin Guo & Yaodong Da & Defu Che, 2024. "Numerical Study on Effect of Flue Gas Recirculation and Co-Firing with Biomass on Combustion Characteristics in Octagonal Tangentially Lignite-Fired Boiler," Energies, MDPI, vol. 17(2), pages 1-15, January.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:2:p:475-:d:1321825
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    References listed on IDEAS

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    1. Yorifuji, Ryota & Obara, Shin'ya, 2022. "Economic design of artificial light plant factories based on the energy conversion efficiency of biomass," Applied Energy, Elsevier, vol. 305(C).
    2. Karol Król & Dorota Nowak-Woźny & Wojciech Moroń, 2023. "Study of Ash Sintering Temperature and Ash Deposition Behavior during Co-Firing of Polish Bituminous Coal with Barley Straw Using Non-Standard Tests," Energies, MDPI, vol. 16(11), pages 1-15, May.
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