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Oxy-fuel combustion of coal and biomass blends

Author

Listed:
  • Riaza, J.
  • Gil, M.V.
  • Álvarez, L.
  • Pevida, C.
  • Pis, J.J.
  • Rubiera, F.

Abstract

The ignition temperature, burnout and NO emissions of blends of a semi-anthracite and a high-volatile bituminous coal with 10 and 20 wt.% of olive waste were studied under oxy-fuel combustion conditions in an entrained flow reactor (EFR). The results obtained under several oxy-fuel atmospheres (21%O2–79%CO2, 30%O2–70%CO2 and 35%O2–65%CO2) were compared with those attained in air. The results indicated that replacing N2 by CO2 in the combustion atmosphere with 21% of O2 caused an increase in the temperature of ignition and a decrease in the burnout value. When the O2 concentration was increased to 30 and 35%, the temperature of ignition was lower and the burnout value was higher than in air conditions. A significant reduction in ignition temperature and a slight increase in the burnout value was observed after the addition of biomass, this trend becoming more noticeable as the biomass concentration was increased. The emissions of NO during oxy-fuel combustion were lower than under air-firing. However, they remained similar under all the oxy-fuel atmospheres with increasing O2 concentrations. Emissions of NO were significantly reduced by the addition of biomass to the bituminous coal, although this effect was less noticeable in the case of the semi-anthracite.

Suggested Citation

  • Riaza, J. & Gil, M.V. & Álvarez, L. & Pevida, C. & Pis, J.J. & Rubiera, F., 2012. "Oxy-fuel combustion of coal and biomass blends," Energy, Elsevier, vol. 41(1), pages 429-435.
    • Handle: RePEc:eee:energy:v:41:y:2012:i:1:p:429-435
    DOI: 10.1016/j.energy.2012.02.057
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    References listed on IDEAS

    as
    1. Riaza, J. & Álvarez, L. & Gil, M.V. & Pevida, C. & Pis, J.J. & Rubiera, F., 2011. "Effect of oxy-fuel combustion with steam addition on coal ignition and burnout in an entrained flow reactor," Energy, Elsevier, vol. 36(8), pages 5314-5319.
    2. Hong, Jongsup & Chaudhry, Gunaranjan & Brisson, J.G. & Field, Randall & Gazzino, Marco & Ghoniem, Ahmed F., 2009. "Analysis of oxy-fuel combustion power cycle utilizing a pressurized coal combustor," Energy, Elsevier, vol. 34(9), pages 1332-1340.
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    5. Lucia Álvarez & Juan Riaza & Maria V. Gil & Covadonga Pevida & José J. Pis & Fernando Rubiera, 2011. "NO emissions in oxy‐coal combustion with the addition of steam in an entrained flow reactor," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 1(2), pages 180-190, June.
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