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CFD Modeling: Different Kinetic Approaches for Internal Reforming Reactions in an Anode-Supported SOFC

Paradis, Hedvig LU ; Andersson, Martin LU ; Yuan, Jinliang LU and Sundén, Bengt LU (2011) In Journal of Fuel Cell Science and Technology 8(031014).
Abstract
Fuel cells are electrochemical devices that convert chemical energy into electricity. Solid oxide fuel cells (SOFCs) are a particularly interesting type because they can reform hydrocarbon fuels directly within the cell, which are possible thanks to their high operating temperature. The purpose of this study is to develop an anode-supported SOFC theoretical model, to enhance the understanding of the internal reforming reactions and their effects on the transport processes.

A CFD approach, based on the finite element method, is implemented to unravel the interaction between internal reforming reactions, momentum, heat and mass transport. The three different steam reforming reaction rates applied were developed and correlated to... (More)
Fuel cells are electrochemical devices that convert chemical energy into electricity. Solid oxide fuel cells (SOFCs) are a particularly interesting type because they can reform hydrocarbon fuels directly within the cell, which are possible thanks to their high operating temperature. The purpose of this study is to develop an anode-supported SOFC theoretical model, to enhance the understanding of the internal reforming reactions and their effects on the transport processes.

A CFD approach, based on the finite element method, is implemented to unravel the interaction between internal reforming reactions, momentum, heat and mass transport. The three different steam reforming reaction rates applied were developed and correlated to experimental studies found in the literature. An equilibrium rate equation is implemented for the water-gas shift reaction. The result showed that the reaction rates are very fast and differ quite a lot in the size. The pre-exponential values, in relation to the partial pressures, and the activation energy was affected the reaction rate. It was shown that the anode structure and catalytic composition have a major impact on the reforming reaction rate and on the cell performance. The large difference between the different activation energies and pre-exponential values found in the literature reveals that several parameters probably have significant influence on the reaction rate. As the experiments with the same chemical compositions can be conducted on a cell or only a reformer, it is important to reflect over the effect this has on the kinetic model. To fully understand the effect of the parameters connected to the internal reforming reaction, micro scale modeling is needed. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
SOFC, modeling, internal reforming reactions, anode-supported, transport processes.
in
Journal of Fuel Cell Science and Technology
volume
8
issue
031014
publisher
American Society Of Mechanical Engineers (ASME)
external identifiers
  • WOS:000287882300014
  • Scopus:79953283592
ISSN
1551-6989
DOI
10.1115/1.4002906
language
English
LU publication?
yes
id
954bd489-6494-452f-9ae9-d11662f72cd2 (old id 1729108)
alternative location
http://www.ht.energy.lth.se/fileadmin/ht/Forskning/Jinliang_s_files/asme_fc_journal_final_Hedvig.pdf
date added to LUP
2011-05-26 13:05:48
date last changed
2016-10-13 04:37:48
@misc{954bd489-6494-452f-9ae9-d11662f72cd2,
  abstract     = {Fuel cells are electrochemical devices that convert chemical energy into electricity. Solid oxide fuel cells (SOFCs) are a particularly interesting type because they can reform hydrocarbon fuels directly within the cell, which are possible thanks to their high operating temperature. The purpose of this study is to develop an anode-supported SOFC theoretical model, to enhance the understanding of the internal reforming reactions and their effects on the transport processes. <br/><br>
A CFD approach, based on the finite element method, is implemented to unravel the interaction between internal reforming reactions, momentum, heat and mass transport. The three different steam reforming reaction rates applied were developed and correlated to experimental studies found in the literature. An equilibrium rate equation is implemented for the water-gas shift reaction. The result showed that the reaction rates are very fast and differ quite a lot in the size. The pre-exponential values, in relation to the partial pressures, and the activation energy was affected the reaction rate. It was shown that the anode structure and catalytic composition have a major impact on the reforming reaction rate and on the cell performance. The large difference between the different activation energies and pre-exponential values found in the literature reveals that several parameters probably have significant influence on the reaction rate. As the experiments with the same chemical compositions can be conducted on a cell or only a reformer, it is important to reflect over the effect this has on the kinetic model. To fully understand the effect of the parameters connected to the internal reforming reaction, micro scale modeling is needed.},
  author       = {Paradis, Hedvig and Andersson, Martin and Yuan, Jinliang and Sundén, Bengt},
  issn         = {1551-6989},
  keyword      = {SOFC,modeling,internal reforming reactions,anode-supported,transport processes.},
  language     = {eng},
  number       = {031014},
  publisher    = {ARRAY(0x7c1e9f0)},
  series       = {Journal of Fuel Cell Science and Technology},
  title        = {CFD Modeling: Different Kinetic Approaches for Internal Reforming Reactions in an Anode-Supported SOFC},
  url          = {http://dx.doi.org/10.1115/1.4002906},
  volume       = {8},
  year         = {2011},
}