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Oxy-combustion characteristics of torrefied biomass and blends under O2/N2, O2/CO2 and O2/CO2/H2O atmospheres

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  • Díez, Luis I.
  • García-Mariaca, Alexander
  • Canalís, Paula
  • Llera, Eva

Abstract

The combined use of bio-fuels along with CO2 capture techniques is the basis for the so-called negative emissions energy systems. In this paper, oxy-fuel combustion of two torrefied biomasses is experimentally investigated in a lab-scale entrained flow reactor. The torrefied biomasses are fired alone, and co-fired with coal (50%). Two oxygen concentrations (21% and 35%) and four steam concentrations are tested: 0% (dry recycle oxy-combustion), 10% (wet recycle oxy-combustion), 25% and 40% (towards the concept of oxy-steam combustion). The tests are designed to get the same mean residence time for all the fuels and conditions. Burnout degrees are significantly increased (up to 9 and 16 percentage points) when the share of torrefied biomass is raised, with a slightly better behavior of the torrefied pine in comparison to the torrefied agro-biomass. C-fuel conversion to CO2 follows a similar trend to the observed for the burnout degrees. NO formation rates are reduced when oxy-firing torrefied biomass alone in comparison to the blends, with maximum diminutions of 16.9% (torrefied pine) and 8.5% (torrefied agro-biomass). As regards the effect of steam, the best results are found for the 25% H2O atmospheres in most of the cases, yielding maximum conversions along with minimum NO levels.

Suggested Citation

  • Díez, Luis I. & García-Mariaca, Alexander & Canalís, Paula & Llera, Eva, 2023. "Oxy-combustion characteristics of torrefied biomass and blends under O2/N2, O2/CO2 and O2/CO2/H2O atmospheres," Energy, Elsevier, vol. 284(C).
    • Handle: RePEc:eee:energy:v:284:y:2023:i:c:s0360544223019539
    DOI: 10.1016/j.energy.2023.128559
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    References listed on IDEAS

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    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. 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.
    3. Sher, Farooq & Yaqoob, Aqsa & Saeed, Farrukh & Zhang, Shengfu & Jahan, Zaib & Klemeš, Jiří Jaromír, 2020. "Torrefied biomass fuels as a renewable alternative to coal in co-firing for power generation," Energy, Elsevier, vol. 209(C).
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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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