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Numerical Simulation of Vortex Pyrolysis Reactors for Condensable Tar Production from Biomass

Miller, R. S. and Bellan, J. (1998) Numerical Simulation of Vortex Pyrolysis Reactors for Condensable Tar Production from Biomass. Energy and Fuels, 12 (1). pp. 25-40. ISSN 0887-0624. doi:10.1021/ef970088a.

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A numerical study is performed in order to evaluate the performance and optimal operating conditions of vortex pyrolysis reactors used for condensable tar production from biomass. A detailed mathematical model of porous biomass particle pyrolysis is coupled with a compressible Reynolds stress transport model for the turbulent reactor swirling flow. An initial evaluation of particle dimensionality effects is made through comparisons of single- (1D) and multi-dimensional particle simulations and reveals that the 1D particle model results in conservative estimates for total pyrolysis conversion times and tar collection. The observed deviations are due predominantly to geometry effects while directional effects from thermal conductivity and permeability variations are relatively small. Rapid ablative particle heating rates are attributed to a mechanical fragmentation of the biomass particles that is modeled using a critical porosity for matrix breakup. Optimal thermal conditions for tar production are observed for 900 K. Effects of biomass identity, particle size distribution, and reactor geometry and scale are discussed.

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Bellan, J.0000-0001-9218-7017
Additional Information:© 1998 American Chemical Society. Received June 17, 1997. Revised Manuscript Received July 28, 1997. Publication Date (Web): January 12, 1998. This research was conducted at the Jet Propulsion Laboratory (JPL) and sponsored by the U.S. Department of Energy (DOE), with Mr. Neil Rossmeissl (DOE Headquarters) and Mr. D. Hooker (DOE Golden Center) serving as contract monitors, under an agreement with the National Aeronautics and Space Administration. Computational resources are provided by the supercomputing facility at JPL.
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Department of Energy (DOE)UNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20171019-143611991
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Official Citation:Numerical Simulation of Vortex Pyrolysis Reactors for Condensable Tar Production from Biomass. R. S. Miller and and J. Bellan. Energy & Fuels 1998 12 (1), 25-40 DOI: 10.1021/ef970088a
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82518
Deposited By: Tony Diaz
Deposited On:19 Oct 2017 21:45
Last Modified:15 Nov 2021 19:51

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