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CFD-based coupled multiphase modeling of biochar production using a large-scale pyrolysis plant

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  • Khodaei, Hassan
  • Gonzalez, Luis
  • Chapela, Sergio
  • Porteiro, Jacobo
  • Nikrityuk, Petr
  • Olson, Chris

Abstract

This paper presents a combined CFD simulation of the thermal conversion of biomass to biochar and the co-combustion of air and biomass volatiles with non-premixed swirl air and volatiles in an industrial pyrolysis plant. The main objective of this study is to investigate thermal conversion process in indirect biochar plants taking into accounts the main challenges associated with biochar production. The model is based on the implementation of calculations on the thermal conversion of biomass in a computational fluid dynamics (CFD) environment. Several sub-models have been introduced to simulate the thermal conversion of biomass to biochar, taking into consideration heat and mass transfer, drying, pyrolysis and volume shrinkage. A non-uniform heat flux obtained by simulating the non-premixed co-combustion of the swirl propane burner and the wood volatile gas has been implemented as an inlet boundary condition in the pyrolysis section. The feasibility of the self-ignition of wood volatiles has been investigated. Uniformity of heat transfer rate between thermal oxidizer and pyrolysis section and lower moisture content in the feedstocks play a remarkable role in producing higher quality of biochar and minimizing residence time in indirect slow pyrolysis plants.

Suggested Citation

  • Khodaei, Hassan & Gonzalez, Luis & Chapela, Sergio & Porteiro, Jacobo & Nikrityuk, Petr & Olson, Chris, 2021. "CFD-based coupled multiphase modeling of biochar production using a large-scale pyrolysis plant," Energy, Elsevier, vol. 217(C).
    • Handle: RePEc:eee:energy:v:217:y:2021:i:c:s0360544220324324
    DOI: 10.1016/j.energy.2020.119325
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    1. Mohammad I. Jahirul & Mohammad G. Rasul & Ashfaque Ahmed Chowdhury & Nanjappa Ashwath, 2012. "Biofuels Production through Biomass Pyrolysis —A Technological Review," Energies, MDPI, vol. 5(12), pages 1-50, November.
    2. Babler, Matthaus U. & Phounglamcheik, Aekjuthon & Amovic, Marko & Ljunggren, Rolf & Engvall, Klas, 2017. "Modeling and pilot plant runs of slow biomass pyrolysis in a rotary kiln," Applied Energy, Elsevier, vol. 207(C), pages 123-133.
    3. Choi, Gyung-Goo & Oh, Seung-Jin & Kim, Joo-Sik, 2017. "Clean pyrolysis oil from a continuous two-stage pyrolysis of scrap tires using in-situ and ex-situ desulfurization," Energy, Elsevier, vol. 141(C), pages 2234-2241.
    4. Weldekidan, Haftom & Strezov, Vladimir & Li, Rui & Kan, Tao & Town, Graham & Kumar, Ravinder & He, Jing & Flamant, Gilles, 2020. "Distribution of solar pyrolysis products and product gas composition produced from agricultural residues and animal wastes at different operating parameters," Renewable Energy, Elsevier, vol. 151(C), pages 1102-1109.
    5. Khodaei, Hassan & Olson, Chris & Nikrityuk, Petr, 2019. "Numerical investigations of the impact of inflow conditions on characteristics of a large-scale pyrolysis unit," Energy, Elsevier, vol. 169(C), pages 1101-1111.
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    Cited by:

    1. Sahar Safarian & Magnus Rydén & Matty Janssen, 2022. "Development and Comparison of Thermodynamic Equilibrium and Kinetic Approaches for Biomass Pyrolysis Modeling," Energies, MDPI, vol. 15(11), pages 1-18, May.
    2. César Álvarez-Bermúdez & Sergio Chapela & Luis G. Varela & Miguel Ángel Gómez, 2021. "CFD Simulation of an Internally Cooled Biomass Fixed-Bed Combustion Plant," Resources, MDPI, vol. 10(8), pages 1-19, July.
    3. Gómez, M.A. & Álvarez-Bermúdez, C. & Chapela, S. & Anca-Couce, A. & Porteiro, J., 2023. "Study of the effects of thermally thin and thermally thick particle approaches on the Eulerian modeling of a biomass combustor operating with wood chips," Energy, Elsevier, vol. 281(C).
    4. Zhang, Yuchun & Fu, Peng & Yi, Weiming & Li, Zhihe & Li, Zhiyu & Wang, Shaoqing & Li, Yongjun, 2021. "Species transport and reaction characteristics between gas and solid phases for ex-situ catalytic pyrolysis of biomass," Energy, Elsevier, vol. 225(C).

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