Article | Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th ‚Äď 27th, 2017 | Evaluation of drag models for CFD simulation of fluidized bed biomass gasification
Göm menyn

Title:
Evaluation of drag models for CFD simulation of fluidized bed biomass gasification
Author:
Kjell-Arne Solli: Department of Process, Energy and Environmental Technology, University College of Southeast Norway, Norway Cornelius Agu: Department of Process, Energy and Environmental Technology, University College of Southeast Norway, Norway
DOI:
10.3384/ecp1713897
Download:
Full text (pdf)
Year:
2017
Conference:
Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th ‚Äď 27th, 2017
Issue:
138
Article no.:
013
Pages:
97-107
No. of pages:
11
Publication type:
Abstract and Fulltext
Published:
2017-09-27
ISBN:
978-91-7685-417-4
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


Export in BibTex, RIS or text

Gasification of biomass into suitable feedstock has become a feasible alternative technology for reducing the use of energy feedstock from fossil sources. Usually, fluidized bed technology is used in the biomass gasification reactor. Optimization of a fluidized bed reactor needs to take into account the bed behavior in the presence of both biomass and bed material, as well as chemical conversion of particles and volatiles, among other process parameters. CFD simulation of the process is a valuable tool to go about the optimization. However, simulation result validation is limited by the accuracy of input parameters such as those characterizing several drag models given in the literature. This study is focusing on the drag model parameters. The simulation is aimed at validating some of the commonly used models for drag forces against the bed material(s) used in the fluidized bed gasification reactor. Drag models included in this study are those given by Syamlal and O’Brien, Gidaspow, and BVK. The MFiX CFD-software (version 2016.1) from The National Energy Technology Laboratory (NETL) is used. The Two-Fluid Model (TFM) are applied for comparison of the results. The key factors for validation of the drag models are based on the superficial gas velocity at the minimum fluidization condition and the degree of bed expansion. The simulation results show that the minimum fluidization velocity could be predicted using the Gidaspow and BVK drag models by adjusting the particle diameter used in the simulation. For the Syamlal & O’Brien drag model, two parameters are fitted to predict the minimum fluidization velocity. The bubbling bed behavior is not captured using the Syamlal & O’Brien drag model while Gidaspow and BVK drag models fairly captures this phenomenon. The bed expansion from the simulation is higher than that observed in the experiment, and the deviation is even higher with the Syamlal & O’Brien drag model.

Keywords: CFD, fluidized bed, drag model, TFM

Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th ‚Äď 27th, 2017

Author:
Kjell-Arne Solli, Cornelius Agu
Title:
Evaluation of drag models for CFD simulation of fluidized bed biomass gasification
DOI:
http://dx.doi.org/10.3384/ecp1713897
References:
No references available

Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th ‚Äď 27th, 2017

Author:
Kjell-Arne Solli, Cornelius Agu
Title:
Evaluation of drag models for CFD simulation of fluidized bed biomass gasification
DOI:
http://dx.doi.org/10.3384/ecp1713897
Note: the following are taken directly from CrossRef
Citations:
No citations available at the moment


Responsible for this page: Peter Berkesand
Last updated: 2017-02-21