Numerical comparison of the drag models of granular flows
applied to the fast pyrolysis of biomass
Numerical comparison of the drag models of granular flows
applied to the fast pyrolysis of biomass
The paper presents a comparison between the different drag models for granular flows developed in the literature and the effect of each one of them on the fast pyrolysis of wood. The process takes place on an 100 g/h lab scale bubbling fluidized bed reactor located at Aston University. FLUENT 6.3 is used as the modeling framework of the fluidized bed hydrodynamics, while the fast pyrolysis of the discrete wood particles is incorporated as an external user defined function (UDF) hooked to FLUENT’s main code structure. Three different drag models for granular flows are compared, namely the Gidaspow, Syamlal O’Brien, and Wen-Yu, already incorporated in FLUENT’s main code, and their impact on particle trajectory, heat transfer, degradation rate, product yields, and char residence time is quantified. The Eulerian approach is used to model the bubbling behavior of the sand, which is treated as a continuum. Biomass reaction kinetics is modeled according to the literature using a two-stage, semiglobal model that takes into account secondary reactions.
2133-2145
Papadikis, K
444e75ed-4845-4a85-95ce-c1c96049bb24
Gu, S
a6f7af91-4731-46fe-ac4d-3081890ab704
Fivga, A
00203253-d495-4df0-a6ed-a75a988c2889
Bridgwater, A.V
8b67cad4-a802-46cd-88b4-bd41ee8a6dd8
22 February 2010
Papadikis, K
444e75ed-4845-4a85-95ce-c1c96049bb24
Gu, S
a6f7af91-4731-46fe-ac4d-3081890ab704
Fivga, A
00203253-d495-4df0-a6ed-a75a988c2889
Bridgwater, A.V
8b67cad4-a802-46cd-88b4-bd41ee8a6dd8
Papadikis, K, Gu, S, Fivga, A and Bridgwater, A.V
(2010)
Numerical comparison of the drag models of granular flows
applied to the fast pyrolysis of biomass.
Energy and Fuels, 24 (3), .
(doi:10.1021/ef901497b).
Abstract
The paper presents a comparison between the different drag models for granular flows developed in the literature and the effect of each one of them on the fast pyrolysis of wood. The process takes place on an 100 g/h lab scale bubbling fluidized bed reactor located at Aston University. FLUENT 6.3 is used as the modeling framework of the fluidized bed hydrodynamics, while the fast pyrolysis of the discrete wood particles is incorporated as an external user defined function (UDF) hooked to FLUENT’s main code structure. Three different drag models for granular flows are compared, namely the Gidaspow, Syamlal O’Brien, and Wen-Yu, already incorporated in FLUENT’s main code, and their impact on particle trajectory, heat transfer, degradation rate, product yields, and char residence time is quantified. The Eulerian approach is used to model the bubbling behavior of the sand, which is treated as a continuum. Biomass reaction kinetics is modeled according to the literature using a two-stage, semiglobal model that takes into account secondary reactions.
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Published date: 22 February 2010
Organisations:
Engineering Sciences
Identifiers
Local EPrints ID: 147405
URI: http://eprints.soton.ac.uk/id/eprint/147405
ISSN: 0887-0624
PURE UUID: 79050c40-fa2d-44df-b4c0-0374f46afeb7
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Date deposited: 27 Apr 2010 08:34
Last modified: 14 Mar 2024 01:00
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Author:
K Papadikis
Author:
S Gu
Author:
A Fivga
Author:
A.V Bridgwater
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