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Sensitivity analysis of homogeneous reactions for thermochemical conversion of biomass in a downdraft gasifier

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  • Kumar, Umesh
  • Paul, Manosh C.

Abstract

Biomass containing organic materials could come from a number of sources such as from agricultural residues, sustainable forests, waste food, and industry by-products. Also, being a renewable source of energy, it has the significant potential to reduce greenhouse gas emissions releasing from the fossil fuel based technologies. Therefore, energy from biomass is becoming a favourable technology to convert solid fuel to valuable gas and one of the effective approaches is gasification. In this research, a three dimensional (3D) computational fluid dynamics (CFD) steady-state thermochemical model is developed to simulate biomass (rubber wood) gasification in a downdraft gasifier. Simulated CFD model includes all the four zones (drying, pyrolysis, oxidation and reduction) of gasifer. For optimising the gasifier temperature and syngas composition, a sensitivity analysis of homogeneous oxidation reactions is carried out, with the model identifying the suitable kinetic reactions for gasification. Predicted CFD modelling results are compared with those from the kinetic modelling and experimental results, where a good agreement is obtained. The effect of gasifier temperature, equivalence ratio (ER) and biomass feed rate on the syngas production is studied. Further, the effect of volatile composition and rate of Boudouard reaction at different ERs along the gasifier height is investigated.

Suggested Citation

  • Kumar, Umesh & Paul, Manosh C., 2020. "Sensitivity analysis of homogeneous reactions for thermochemical conversion of biomass in a downdraft gasifier," Renewable Energy, Elsevier, vol. 151(C), pages 332-341.
    • Handle: RePEc:eee:renene:v:151:y:2020:i:c:p:332-341
    DOI: 10.1016/j.renene.2019.11.025
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    References listed on IDEAS

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    1. Patra, Tapas Kumar & Sheth, Pratik N., 2015. "Biomass gasification models for downdraft gasifier: A state-of-the-art review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 50(C), pages 583-593.
    2. La Villetta, M. & Costa, M. & Massarotti, N., 2017. "Modelling approaches to biomass gasification: A review with emphasis on the stoichiometric method," Renewable and Sustainable Energy Reviews, Elsevier, vol. 74(C), pages 71-88.
    3. Jarungthammachote, S. & Dutta, A., 2007. "Thermodynamic equilibrium model and second law analysis of a downdraft waste gasifier," Energy, Elsevier, vol. 32(9), pages 1660-1669.
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    Cited by:

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    2. Ahmed M. Salem & Harnek S. Dhami & Manosh C. Paul, 2022. "Syngas Production and Combined Heat and Power from Scottish Agricultural Waste Gasification—A Computational Study," Sustainability, MDPI, vol. 14(7), pages 1-18, March.
    3. Wang, Lijun & Du, Xiaocheng & Chen, Junqi & Wu, Zhonggang, 2021. "Numerical study on characteristics of biomass oxygen enriched gasification in the new gasifier on an experimental basis," Renewable Energy, Elsevier, vol. 179(C), pages 815-827.
    4. Salem, Ahmed M. & Elsherbiny, Khaled, 2022. "Innovative concept for the effect of changing gasifying medium and injection points on syngas quality: Towards higher H2 production, and Free-CO2 emissions," Energy, Elsevier, vol. 261(PB).
    5. Abdulyekeen, Kabir Abogunde & Umar, Ahmad Abulfathi & Patah, Muhamad Fazly Abdul & Daud, Wan Mohd Ashri Wan, 2021. "Torrefaction of biomass: Production of enhanced solid biofuel from municipal solid waste and other types of biomass," Renewable and Sustainable Energy Reviews, Elsevier, vol. 150(C).

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