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A modeling approach to co-firing biomass/coal blends in pulverized coal utility boilers: Synergistic effects and emissions profiles

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  • Pérez-Jeldres, Rubén
  • Cornejo, Pablo
  • Flores, Mauricio
  • Gordon, Alfredo
  • García, Ximena

Abstract

Pulverized coal power plants in Chile are evaluating to reduce CO2 emissions by co-firing coal with biomass, which is CO2-neutral. A computational fluid dynamics model was used in this study to predict the performance of a 150 MW commercial boiler co-firing pulverized coal with pine sawdust. Synergistic effects were identified by burnout, thermal and hydrodynamic profiles. Co-firing was simulated with 5% of biomass substitution, and feeding in the first level of burners. The model was validated using data from the power plant. The results show an expected decrease in SO2 emissions and a negligible reduction in heat transferred to the water tubes (0.6%). Biomass presence increased the burning rate of fuel particles, as shown by higher CO2 emissions and a lower CO concentration, per unit of thermal power. The model reveals synergistic effects, proved by an increase in temperature, due to an early combustion of biomass particles, increase in the coal combustion rate, and a better temperature distribution in the boiler. These synergistic effects were compared with results obtained at bench scale reported in the literature. Thus, it was concluded that a relatively small replacement of coal by biomass could significantly improve the fuel combustion process and the boiler performance.

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  • Pérez-Jeldres, Rubén & Cornejo, Pablo & Flores, Mauricio & Gordon, Alfredo & García, Ximena, 2017. "A modeling approach to co-firing biomass/coal blends in pulverized coal utility boilers: Synergistic effects and emissions profiles," Energy, Elsevier, vol. 120(C), pages 663-674.
    • Handle: RePEc:eee:energy:v:120:y:2017:i:c:p:663-674
    DOI: 10.1016/j.energy.2016.11.116
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    References listed on IDEAS

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    1. Lu, Ke-Miao & Lee, Wen-Jhy & Chen, Wei-Hsin & Lin, Ta-Chang, 2013. "Thermogravimetric analysis and kinetics of co-pyrolysis of raw/torrefied wood and coal blends," Applied Energy, Elsevier, vol. 105(C), pages 57-65.
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    2. Yin, Chungen, 2020. "Development in biomass preparation for suspension firing towards higher biomass shares and better boiler performance and fuel rangeability," Energy, Elsevier, vol. 196(C).
    3. Toloue Farrokh, Najibeh & Suopajärvi, Hannu & Mattila, Olli & Umeki, Kentaro & Phounglamcheik, Aekjuthon & Romar, Henrik & Sulasalmi, Petri & Fabritius, Timo, 2018. "Slow pyrolysis of by-product lignin from wood-based ethanol production– A detailed analysis of the produced chars," Energy, Elsevier, vol. 164(C), pages 112-123.
    4. Wander, Paulo R. & Bianchi, Flávio M. & Caetano, Nattan R. & Klunk, Marcos A. & Indrusiak, Maria Luiza S., 2020. "Cofiring low-rank coal and biomass in a bubbling fluidized bed with varying excess air ratio and fluidization velocity," Energy, Elsevier, vol. 203(C).
    5. Yin, Junjie & Liu, Ming & Zhao, Yongliang & Wang, Chaoyang & Yan, Junjie, 2021. "Dynamic performance and control strategy modification for coal-fired power unit under coal quality variation," Energy, Elsevier, vol. 223(C).
    6. Ferreiro, A.I. & Segurado, R. & Costa, M., 2020. "Modelling soot formation during biomass gasification," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).

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