Coupling DAEM and CFD for simulating biomass fast pyrolysis in fluidized beds

Xiong, Qingang; Zhang, Jingchao; Wiggins, Gavin; Daw, C. Stuart; Xu, Fei

doi:10.1016/j.jaap.2015.11.015

Title: Coupling DAEM and CFD for simulating biomass fast pyrolysis in fluidized beds

Journal Article · Thu Dec 03 00:00:00 EST 2015 · Journal of Analytical and Applied Pyrolysis

DOI:https://doi.org/10.1016/j.jaap.2015.11.015· OSTI ID:1238742

Xiong, Qingang ^[1]; Zhang, Jingchao ^[2]; Wiggins, Gavin ^[1]; Daw, C. Stuart ^[1]; Xu, Fei ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Nebraska-Lincoln, Lincoln, NE (United States)
Iowa State Univ., Ames, IA (United States)

We report results from computational simulations of an experimental, lab-scale bubbling bed biomass pyrolysis reactor that include a distributed activation energy model (DAEM) for the kinetics. In this study, we utilized multiphase computational fluid dynamics (CFD) to account for the turbulent hydrodynamics, and this was combined with the DAEM kinetics in a multi-component, multi-step reaction network. Our results indicate that it is possible to numerically integrate the coupled CFD–DAEM system without significantly increasing computational overhead. It is also clear, however, that reactor operating conditions, reaction kinetics, and multiphase flow dynamics all have major impacts on the pyrolysis products exiting the reactor. We find that, with the same pre-exponential factors and mean activation energies, inclusion of distributed activation energies in the kinetics can shift the predicted average value of the exit vapor-phase tar flux and its statistical distribution, compared to single-valued activation-energy kinetics. Perhaps the most interesting observed trend is that increasing the diversity of the DAEM activation energies appears to increase the mean tar yield, all else being equal. As a result, these findings imply that accurate resolution of the reaction activation energy distributions will be important for optimizing biomass pyrolysis processes.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1238742

Alternate ID(s):: OSTI ID: 1246545

Journal Information:: Journal of Analytical and Applied Pyrolysis, Vol. 117, Issue C; ISSN 0165-2370

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 63 works

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