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Steady state kinetic model for entrained flow CO2 gasification of biomass at high temperature

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  • Kibria, M.A.
  • Sripada, Pramod
  • Bhattacharya, Sankar

Abstract

Entrained flow gasification technology is considered as a promising technology for its unique nature; high carbon conversion in short residence time and fewer pollutants emission for utilizing solid fuels towards high-value products. In a two-stage dry feed entrained flow gasifier, CO2 is the predominant gas species that evolves from combustion zone with a concentration around 77% and 18% during oxy and air-fired gasifier respectively. The CO2 rich gas stream acts as a reactant in the reduction zone that produces syngas. This article presents a kinetic model of CO2 gasification of biomass that mimics the reduction zone of a dry feed entrained flow reactor. The model is based on plug flow analogy for heat and mass balance. Explicit calculations are performed to calculate particle residence time. Gas-phase reactions are introduced, and the predicted results are compared against a bench-scale entrained flow reactor. The results indicate during high-temperature CO2 gasification condition; the gas-phase chemistry is dominated by the homogenous reverse water gas shift reaction (rWGSR). Particle structure plays an essential role by imposing diffusional effects during char conversion. An increased concentration of CO2 served a dual purpose: raising devolatilization rate and lowering the diffusional limitation.

Suggested Citation

  • Kibria, M.A. & Sripada, Pramod & Bhattacharya, Sankar, 2020. "Steady state kinetic model for entrained flow CO2 gasification of biomass at high temperature," Energy, Elsevier, vol. 196(C).
    • Handle: RePEc:eee:energy:v:196:y:2020:i:c:s0360544220301808
    DOI: 10.1016/j.energy.2020.117073
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    References listed on IDEAS

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    1. Kibria, M.A. & Sripada, Pramod & Woo, M.W. & Bhattacharya, Sankar, 2019. "Fate of a biomass particle during CO2 gasification: A mathematical model under entrained flow condition at high temperature," Energy, Elsevier, vol. 168(C), pages 1045-1062.
    2. Khatib, Hisham, 2012. "IEA World Energy Outlook 2011—A comment," Energy Policy, Elsevier, vol. 48(C), pages 737-743.
    3. Moonkyeong Hwang & Eunhye Song & Juhun Song, 2016. "One-Dimensional Modeling of an Entrained Coal Gasification Process Using Kinetic Parameters," Energies, MDPI, vol. 9(2), pages 1-21, February.
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    1. Tian, Hong & Hu, Qingsong & Wang, Jiawei & Chen, Donglin & Yang, Yang & Bridgwater, Anthony V., 2021. "Kinetic study on the CO2 gasification of biochar derived from Miscanthus at different processing conditions," Energy, Elsevier, vol. 217(C).
    2. Fang, Yi & Paul, Manosh C. & Varjani, Sunita & Li, Xian & Park, Young-Kwon & You, Siming, 2021. "Concentrated solar thermochemical gasification of biomass: Principles, applications, and development," Renewable and Sustainable Energy Reviews, Elsevier, vol. 150(C).
    3. Du, Hong & Ma, Xiuyun & Jiang, Miao & Yan, Peifang & Zhang, Z.Conrad, 2021. "Autocatalytic co-upgrading of biochar and pyrolysis gas to syngas," Energy, Elsevier, vol. 221(C).
    4. Tae-Jin Kang & Jin-Hee Lee & Da-Hye Lee & Hyo-Sik Kim & Suk-Hwan Kang, 2025. "Effect of High Temperature on CO 2 Gasification Kinetics of Sub-Bituminous Coal Fly Ash," Sustainability, MDPI, vol. 17(4), pages 1-17, February.

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