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Extension of apparent devolatilization kinetics from thermally thin to thermally thick particles in zero dimensions for woody biomass

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  • Johansen, Joakim M.
  • Jensen, Peter A.
  • Glarborg, Peter
  • Mancini, Marco
  • Weber, Roman
  • Mitchell, Reginald E.

Abstract

This work aims to provide an accurate and simple model, predicting the time dependent devolatilization of woody biomass at conditions (Tgas < 2000 K) and particle sizes (<2 mm) relevant to suspension fired boilers. The zero dimensional model is developed from reference calculations with a one-dimensional heat transport model coupled with a drying and a devolatilization model. The model output has been used to generate pyrolysis kinetics corrected for non-isothermal effects, i.e. intraparticle heat transport limitations. Analysis of the modeling results indicate that heat transport corrections of even small particles are necessary. The current work divides a given particle size distribution into suitable size categories based on their internal heat transport properties. The devolatilization is described by size category specific rate constants based on a single first order reaction mechanism. This approach allows for significantly more accurate devolatilization predictions of any particle size distribution to be described by simple kinetic mechanisms and isothermal particle heat balances. Such an approach is easily implemented into most commercial CFD (computational fluid dynamics) codes without adding any additional strain to the computational requirements.

Suggested Citation

  • Johansen, Joakim M. & Jensen, Peter A. & Glarborg, Peter & Mancini, Marco & Weber, Roman & Mitchell, Reginald E., 2016. "Extension of apparent devolatilization kinetics from thermally thin to thermally thick particles in zero dimensions for woody biomass," Energy, Elsevier, vol. 95(C), pages 279-290.
    • Handle: RePEc:eee:energy:v:95:y:2016:i:c:p:279-290
    DOI: 10.1016/j.energy.2015.11.025
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    1. Maximino Manzanera (ed.), 2011. "Alternative Fuel," Books, IntechOpen, number 1076.
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    Cited by:

    1. Siddiqi, Hammad & Kumari, Usha & Biswas, Subrata & Mishra, Asmita & Meikap, B.C., 2020. "A synergistic study of reaction kinetics and heat transfer with multi-component modelling approach for the pyrolysis of biomass waste," Energy, Elsevier, vol. 204(C).
    2. Trubetskaya, Anna & Surup, Gerrit & Shapiro, Alexander & Bates, Richard B., 2017. "Modeling the influence of potassium content and heating rate on biomass pyrolysis," Applied Energy, Elsevier, vol. 194(C), pages 199-211.
    3. Tavakkol, Salar & Zirwes, Thorsten & Denev, Jordan A. & Jamshidi, Farshid & Weber, Niklas & Bockhorn, Henning & Trimis, Dimosthenis, 2021. "An Eulerian-Lagrangian method for wet biomass carbonization in rotary kiln reactors," Renewable and Sustainable Energy Reviews, Elsevier, vol. 139(C).
    4. Anna Espekvist & Tian Li & Peter Glarborg & Terese Løvås & Peter Arendt Jensen, 2021. "Determination of Zero Dimensional, Apparent Devolatilization Kinetics for Biomass Particles at Suspension Firing Conditions," Energies, MDPI, vol. 14(4), pages 1-18, February.
    5. Niemelä, Niko P. & Tolvanen, Henrik & Saarinen, Teemu & Leppänen, Aino & Joronen, Tero, 2017. "CFD based reactivity parameter determination for biomass particles of multiple size ranges in high heating rate devolatilization," Energy, Elsevier, vol. 128(C), pages 676-687.

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