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Energy conversion of biomass char: Oxidation rates in mixtures of O2/CO2/H2O

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  • Karlström, Oskar
  • Hupa, Leena

Abstract

In thermal energy conversion of biomass, the char conversion rate influences the design of industrial systems. Yet there is no consensus on the relative influences of O2, CO2 and H2O on the char conversion rate. The present study aims at clarifying the roles of these oxidizers on biomass char conversion. Single particles of different particles sizes were oxidized in mixtures of O2/N2, CO2/N2, H2O/N2 and O2/CO2/H2O/N2 at various temperatures. The results show that for large particles and high temperatures, CO2 and H2O gasification reactions play a dominant role, while for sufficiently small particles and low temperatures, the O2 oxidation reaction plays a dominant role in mixtures of O2/CO2/H2O/N2. Two different particle models were used to compute char conversions: a detailed single particle model, and a conventional particle model assuming that rates in mixtures of oxidizers can be predicted based on rates of single oxidizers. The results show that the char oxidation rates are strongly overestimated when predicting rates based on single oxidizers, while the detailed model shows a good agreement to the experimental measurements.

Suggested Citation

  • Karlström, Oskar & Hupa, Leena, 2019. "Energy conversion of biomass char: Oxidation rates in mixtures of O2/CO2/H2O," Energy, Elsevier, vol. 181(C), pages 615-624.
    • Handle: RePEc:eee:energy:v:181:y:2019:i:c:p:615-624
    DOI: 10.1016/j.energy.2019.05.192
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    References listed on IDEAS

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    1. Geier, M. & Shaddix, C.R. & Davis, K.A. & Shim, H.-S., 2012. "On the use of single-film models to describe the oxy-fuel combustion of pulverized coal char," Applied Energy, Elsevier, vol. 93(C), pages 675-679.
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    1. N., Mohammed Asheruddin & Shivapuji, Anand M. & Dasappa, Srinivasaiah, 2023. "Thermochemical conversion of millimeter-sized single char particle in steam dominated environments under varying temperature, reactant composition and flux—Experimental and numerical analysis," Energy, Elsevier, vol. 269(C).
    2. Ling, Jester Lih Jie & Yang, Won & Park, Han Saem & Lee, Ha Eun & Lee, See Hoon, 2023. "A comparative review on advanced biomass oxygen fuel combustion technologies for carbon capture and storage," Energy, Elsevier, vol. 284(C).
    3. Mortari, Daniela A. & Pereira, Fernando M. & Crnkovic, Paula M., 2020. "Experimental investigation of the carbon dioxide effect on the devolatilization and combustion of a coal and sugarcane bagasse," Energy, Elsevier, vol. 204(C).
    4. Jiseok Lee & Seunghan Yu & Jinje Park & Hyunbin Jo & Jongkeun Park & Changkook Ryu & Yeong-gap Jeong, 2020. "Reduction of Unburned Carbon Release and NO x Emission from a Pulverized Wood Pellet Boiler Retrofitted for Fuel Switching from Coal," Energies, MDPI, vol. 13(19), pages 1-17, September.

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