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CFD modelling of the fast pyrolysis of biomass in fluidised bed reactors: Modelling the impact of biomass shrinkage

Papadikis, K, Gu, S and Bridgwater, AV (2009) CFD modelling of the fast pyrolysis of biomass in fluidised bed reactors: Modelling the impact of biomass shrinkage Chemical Engineering Journal, 149 (1-3, 1). pp. 417-427.

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Abstract

The fluid–particle interaction and the impact of shrinkage on pyrolysis of biomass inside a 150 g/h fluidised bed reactor is modelled. Two 500 View the MathML sourcem in diameter biomass particles are injected into the fluidised bed with different shrinkage conditions. The two different conditions consist of (1) shrinkage equal to the volume left by the solid devolatilization, and (2) shrinkage parameters equal to approximately half of particle volume. The effect of shrinkage is analysed in terms of heat and momentum transfer as well as product yields, pyrolysis time and particle size considering spherical geometries. The Eulerian approach is used to model the bubbling behaviour of the sand, which is treated as a continuum. Heat transfer from the bubbling bed to the discrete biomass particle, as well as biomass reaction kinetics are modelled according to the literature. The particle motion inside the reactor is computed using drag laws, dependent on the local volume fraction of each phase. FLUENT 6.2 has been used as the modelling framework of the simulations with the whole pyrolysis model incorporated in the form of user defined function (UDF).

Item Type: Article
Authors :
NameEmailORCID
Papadikis, KUNSPECIFIEDUNSPECIFIED
Gu, SUNSPECIFIEDUNSPECIFIED
Bridgwater, AVUNSPECIFIEDUNSPECIFIED
Date : 2 February 2009
Identification Number : 10.1016/j.cej.2009.01.036
Copyright Disclaimer : Copyright © 2016 Elsevier B.V. or its licensors or contributors.
Uncontrolled Keywords : CFD, Fluidized bed, Fast pyroysis, Heat transfer, Biomass shrinkage
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 10:59
Last Modified : 31 Oct 2017 18:15
URI: http://epubs.surrey.ac.uk/id/eprint/810574

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