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CFD Simulation of an Internally Cooled Biomass Fixed-Bed Combustion Plant

Author

Listed:
  • César Álvarez-Bermúdez

    (Grupo de Tecnología Energética (GTE), CINTECX, Universidade de Vigo, 36310 Vigo, Spain)

  • Sergio Chapela

    (Grupo de Tecnología Energética (GTE), CINTECX, Universidade de Vigo, 36310 Vigo, Spain)

  • Luis G. Varela

    (Grupo de Tecnología Energética (GTE), CINTECX, Universidade de Vigo, 36310 Vigo, Spain)

  • Miguel Ángel Gómez

    (Grupo de Tecnología Energética (GTE), CINTECX, Universidade de Vigo, 36310 Vigo, Spain)

Abstract

The reduction of bed temperature in fixed-bed biomass combustion is an effective measure to lower pollutant emissions. Air staging and bed cooling solutions are active strategies to decrease the fuel bed temperature. This work presents a CFD study of a biomass fixed-bed combustion plant that is equipped with an internal cooling bed system. Eight different cases are calculated to analyze the effect of the total airflow, air staging ratios and bed cooling system on biomass combustion. The findings are validated against experimental data from the literature. The results show good accordance between the numerical results and the experimental data. The primary airflow rate has the biggest influence on the bed’s maximum temperatures. The internal bed cooling system is able to achieve an average bed temperature reduction of 21%, slowing the biomass thermal conversion processes. Bed cooling techniques can be combined with air staging and primary airflow reduction to reduce bed temperatures in order to reduce pollutant emissions and other undesirable phenomena, such as fouling or slagging.

Suggested Citation

  • César Álvarez-Bermúdez & Sergio Chapela & Luis G. Varela & Miguel Ángel Gómez, 2021. "CFD Simulation of an Internally Cooled Biomass Fixed-Bed Combustion Plant," Resources, MDPI, vol. 10(8), pages 1-19, July.
  • Handle: RePEc:gam:jresou:v:10:y:2021:i:8:p:77-:d:600028
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    References listed on IDEAS

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    1. Gómez, M.A. & Álvarez-Bermúdez, C. & Chapela, S. & Anca-Couce, A. & Porteiro, J., 2023. "Study of the effects of thermally thin and thermally thick particle approaches on the Eulerian modeling of a biomass combustor operating with wood chips," Energy, Elsevier, vol. 281(C).
    2. Khodaei, H. & Álvarez-Bermúdez, C. & Chapela, S. & Olson, C. & MacKenzie, M.D. & Gómez, M.A. & Porteiro, J., 2024. "Eulerian CFD simulation of biomass thermal conversion in an indirect slow pyrolysis rotary kiln unit to produce biochar from recycled waste wood," Energy, Elsevier, vol. 288(C).

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