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Effect of Air Staging Ratios on the Burning Rate and Emissions in an Underfeed Fixed-Bed Biomass Combustor

Author

Listed:
  • Araceli Regueiro

    (Industrial Engineering School, University of Vigo, Campus Lagoas-Marcosende, s/n, 36310 Vigo, Spain)

  • David Patiño

    (Industrial Engineering School, University of Vigo, Campus Lagoas-Marcosende, s/n, 36310 Vigo, Spain)

  • Jacobo Porteiro

    (Industrial Engineering School, University of Vigo, Campus Lagoas-Marcosende, s/n, 36310 Vigo, Spain)

  • Enrique Granada

    (Industrial Engineering School, University of Vigo, Campus Lagoas-Marcosende, s/n, 36310 Vigo, Spain)

  • José Luis Míguez

    (Industrial Engineering School, University of Vigo, Campus Lagoas-Marcosende, s/n, 36310 Vigo, Spain)

Abstract

This experimental work studies a small-scale biomass combustor (5–12 kW) with an underfed fixed bed using low air staging ratios (15%–30%). This document focuses on the influence of the operative parameters on the combustion process, so gaseous emissions and the distribution and concentration of particulate matter have also been recorded. The facility shows good stability and test repeatability. For the studied airflow ranges, the results show that increasing the total airflow rate does not increase the overall air excess ratio because the burning rate is proportionally enhanced (with some slight differences that depend on the air staging ratio). Consequently, the heterogeneous reactions at the bed remain in the so-called oxygen-limited region, and thus the entire bed operates under sub-stoichiometric conditions with regards of the char content of the biomass. In addition, tests using only primary air (no staging) may increase the fuel consumption, but in a highly incomplete way, approaching a gasification regime. Some measured burning rates are almost 40% higher than previous results obtained in batch combustors due to the fixed position of the ignition front. The recorded concentration of particulate matter varies between 15 and 75 mg/Nm 3 , with a main characteristic diameter between 50 and 100 nm.

Suggested Citation

  • Araceli Regueiro & David Patiño & Jacobo Porteiro & Enrique Granada & José Luis Míguez, 2016. "Effect of Air Staging Ratios on the Burning Rate and Emissions in an Underfeed Fixed-Bed Biomass Combustor," Energies, MDPI, vol. 9(11), pages 1-16, November.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:11:p:940-:d:82657
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    References listed on IDEAS

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    1. Maulana G. Nugraha & Harwin Saptoadi & Muslikhin Hidayat & Bengt Andersson & Ronnie Andersson, 2021. "Particulate Matter Reduction in Residual Biomass Combustion," Energies, MDPI, vol. 14(11), pages 1-23, June.
    2. Raquel Pérez-Orozco & David Patiño & Jacobo Porteiro & José Luís Míguez, 2020. "Novel Test Bench for the Active Reduction of Biomass Particulate Matter Emissions," Sustainability, MDPI, vol. 12(1), pages 1-13, January.
    3. Michał Kozioł & Joachim Kozioł, 2023. "Impact of Primary Air Separation in a Grate Furnace on the Resulting Combustion Products," Energies, MDPI, vol. 16(4), pages 1-16, February.
    4. Ozgen, S. & Cernuschi, S. & Caserini, S., 2021. "An overview of nitrogen oxides emissions from biomass combustion for domestic heat production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).
    5. Luigi F. Polonini & Domenico Petrocelli & Simone P. Parmigiani & Adriano M. Lezzi, 2019. "Influence on CO and PM Emissions of an Innovative Burner Pot for Pellet Stoves: An Experimental Study," Energies, MDPI, vol. 12(4), pages 1-13, February.
    6. Juan Jesús Rico & Raquel Pérez-Orozco & Natalia Cid & Ana Larrañaga & José Luis Míguez Tabarés, 2020. "Viability of Agricultural and Forestry Residues as Biomass Fuels in the Galicia-North Portugal Region: An Experimental Study," Sustainability, MDPI, vol. 12(19), pages 1-20, October.
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    9. Natalia Cid & Juan Jesús Rico & Raquel Pérez-Orozco & Ana Larrañaga, 2021. "Experimental Study of the Performance of a Laboratory-Scale ESP with Biomass Combustion: Discharge Electrode Disposition, Dynamic Control Unit and Aging Effect," Sustainability, MDPI, vol. 13(18), pages 1-12, September.
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