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Tar production from biomass pyrolysis in a fluidized bed reactor: A novel turbulent multiphase flow formulation

Bellan, J. and Lathouwers, D. (1999) Tar production from biomass pyrolysis in a fluidized bed reactor: A novel turbulent multiphase flow formulation. In: Biomass: a growth opportunity in green energy and value-added products. Elsevier , Oxford, pp. 1-7. ISBN 0-08-043019-8.

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A novel multiphase flow model is presented for describing the pyrolysis of biomass in a 'bubbling' fluidized bed reactor. The mixture of biomass and sand in a gaseous flow is conceptualized as a particulate phase composed of two classes interacting with the carrier gaseous flow. The solid biomass is composed of three initial species: cellulose, hemicellulose and lignin. From each of these initial species, two new solid species originate during pyrolysis: an 'active' species and a char, thus totaling seven solid-biomass species. The gas phase is composed of the original carrier gas (steam), tar and gas; the last two species originate from the volumetric pyrolysis reaction. The conservation equations are derived from the Boltzmann equations through ensemble averaging. Stresses in the gaseous phase are the sum of the Newtonian and Reynolds (turbulent) contributions. The particulate phase stresses are the sum of collisional and Reynolds contributions. Heat transfer between phases, and heat transfer between classes in the particulate phase is modeled, the last resulting from collisions between sand and biomass. Closure of the equations must be performed by modeling the Reynolds stresses for both phases. The results of a simplified version (first step) of the model are presented.

Item Type:Book Section
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Bellan, J.0000-0001-9218-7017
Additional Information:© 1999 Elsevier Science.
Record Number:CaltechAUTHORS:20171025-124117232
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82662
Deposited By: Tony Diaz
Deposited On:25 Oct 2017 21:12
Last Modified:09 Mar 2020 13:18

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