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Devolatilization kinetics of woody biomass at short residence times and high heating rates and peak temperatures

Author

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  • Johansen, Joakim M.
  • Gadsbøll, Rasmus
  • Thomsen, Jesper
  • Jensen, Peter A.
  • Glarborg, Peter
  • Ek, Paul
  • De Martini, Nikolai
  • Mancini, Marco
  • Weber, Roman
  • Mitchell, Reginald E.

Abstract

This work combines experimental and computational fluid dynamics (CFD) results to derive global kinetics for biomass (pine wood) devolatilization during heating rates on the order of 105Ks-1, bulk flow peak temperatures between 1405 and 1667K, and particle residence times below 0.1s. Experiments were conducted on a laboratory laminar entrained flow reactor (LFR) using solid fuel feed rates on the order of 10–20mgh-1. Employing a simple single step first order (SFOR) mechanism with an Arrhenius type rate expression, the best fit of the pyrolysis kinetics was found to be: A=18.9×103s-1,Ea=21305Jmol-1. The accuracy of the derived global kinetics was supported by comparing predictions to experimental results from a 15kW furnace. The work emphasizes the importance of characterizing the temperature history of the biomass particles when deriving pyrolysis kinetics. The present results indicate faster kinetics than found in the literature, leading to predicted residence times required for full conversion one order of magnitude lower than when compared to thermogravimetric analysis (TGA) derived kinetics.

Suggested Citation

  • Johansen, Joakim M. & Gadsbøll, Rasmus & Thomsen, Jesper & Jensen, Peter A. & Glarborg, Peter & Ek, Paul & De Martini, Nikolai & Mancini, Marco & Weber, Roman & Mitchell, Reginald E., 2016. "Devolatilization kinetics of woody biomass at short residence times and high heating rates and peak temperatures," Applied Energy, Elsevier, vol. 162(C), pages 245-256.
    • Handle: RePEc:eee:appene:v:162:y:2016:i:c:p:245-256
    DOI: 10.1016/j.apenergy.2015.09.091
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    Citations

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    Cited by:

    1. Cui, Tongmin & Fan, Wenke & Dai, Zhenghua & Guo, Qinghua & Yu, Guangsuo & Wang, Fuchen, 2016. "Variation of the coal chemical structure and determination of the char molecular size at the early stage of rapid pyrolysis," Applied Energy, Elsevier, vol. 179(C), pages 650-659.
    2. Trubetskaya, Anna & Timko, Michael T & Umeki, Kentaro, 2020. "Prediction of fast pyrolysis products yields using lignocellulosic compounds and ash contents," Applied Energy, Elsevier, vol. 257(C).
    3. Gangil, Sandip & Bhargav, Vinod Kumar, 2018. "Influence of torrefaction on intrinsic bioconstituents of cotton stalk: TG-insights," Energy, Elsevier, vol. 142(C), pages 1066-1073.
    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. Mikulčić, Hrvoje & von Berg, Eberhard & Vujanović, Milan & Wang, Xuebin & Tan, Houzhang & Duić, Neven, 2016. "Numerical evaluation of different pulverized coal and solid recovered fuel co-firing modes inside a large-scale cement calciner," Applied Energy, Elsevier, vol. 184(C), pages 1292-1305.
    6. Li, Tian & Niu, Yanqing & Wang, Liang & Shaddix, Christopher & Løvås, Terese, 2018. "High temperature gasification of high heating-rate chars using a flat-flame reactor," Applied Energy, Elsevier, vol. 227(C), pages 100-107.
    7. 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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