Parametric analysis of biomass fast pyrolysis in a downer fluidized bed reactor
Parametric analysis of biomass fast pyrolysis in a downer fluidized bed reactor
This study presents a theoretical parametric analysis of biomass fast pyrolysis in a downer reactor, as part of a dual fluidized bed system. The model framework uses a Eulerian-Eulerian CFD approach and incorporates a user-defined function (UDF) for the thermochemical conversion of biomass. The downer reactor consists of a novel gas-solid separator, which is employed to control the gas residence time within the reactor. The parameters investigated included the reactor temperature, the particle (heat carrier and biomass) size and the gas residence time. The product yield was found to be strongly dependent on the reactor temperature (varied through changing the heat carrier flow rate), intermediately dependent on the sweeping gas (N2) flow rate and the sand particle size, and much less dependent on the biomass particle size (within the range of 1 mm diameter). The developed model and the results demonstrate the advantage and robustness of employing the model for parameters optimization and sensitivity investigation when dealing with complex multiphase flow reactive system. This conclusion will benefit future development and scale-up studies of downer reactors for biomass fast pyrolysis.
Biomass, CFD, Downer reactor, Eulerian-Eulerian, Fast pyrolysis, Parametric analysis
1225-1234
Makkawi, Yassir
217bdad4-a83f-44a9-ab54-b52633298456
Yu, Xi
7e4f553f-cc11-4c6e-ad6d-9fb5c3c07a60
Ocone, Raffaella
89db17bd-1848-4c75-ac00-40b9c077b1a8
31 May 2019
Makkawi, Yassir
217bdad4-a83f-44a9-ab54-b52633298456
Yu, Xi
7e4f553f-cc11-4c6e-ad6d-9fb5c3c07a60
Ocone, Raffaella
89db17bd-1848-4c75-ac00-40b9c077b1a8
Makkawi, Yassir, Yu, Xi and Ocone, Raffaella
(2019)
Parametric analysis of biomass fast pyrolysis in a downer fluidized bed reactor.
Renewable Energy, 143, .
(doi:10.1016/j.renene.2019.05.077).
Abstract
This study presents a theoretical parametric analysis of biomass fast pyrolysis in a downer reactor, as part of a dual fluidized bed system. The model framework uses a Eulerian-Eulerian CFD approach and incorporates a user-defined function (UDF) for the thermochemical conversion of biomass. The downer reactor consists of a novel gas-solid separator, which is employed to control the gas residence time within the reactor. The parameters investigated included the reactor temperature, the particle (heat carrier and biomass) size and the gas residence time. The product yield was found to be strongly dependent on the reactor temperature (varied through changing the heat carrier flow rate), intermediately dependent on the sweeping gas (N2) flow rate and the sand particle size, and much less dependent on the biomass particle size (within the range of 1 mm diameter). The developed model and the results demonstrate the advantage and robustness of employing the model for parameters optimization and sensitivity investigation when dealing with complex multiphase flow reactive system. This conclusion will benefit future development and scale-up studies of downer reactors for biomass fast pyrolysis.
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Published date: 31 May 2019
Additional Information:
Funding Information:
The authors thank The Leverhulme Trust (UK) for a research grant ( RPG-410 ).
Keywords:
Biomass, CFD, Downer reactor, Eulerian-Eulerian, Fast pyrolysis, Parametric analysis
Identifiers
Local EPrints ID: 481882
URI: http://eprints.soton.ac.uk/id/eprint/481882
ISSN: 0960-1481
PURE UUID: 6d954c55-9d71-4906-8b10-fa47de4c3c7e
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Date deposited: 12 Sep 2023 16:43
Last modified: 18 Mar 2024 04:14
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Contributors
Author:
Yassir Makkawi
Author:
Xi Yu
Author:
Raffaella Ocone
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