Two-dimensional transient model of a cascaded micro-tubular solid oxide fuel cell fed with methane

Nehter, Pedro

doi:10.1016/j.jpowsour.2005.07.077

Cited by 35 publications

(27 citation statements)

References 7 publications

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“…If the fuel composition fulfills the equilibrium condition, it is not necessary to differentiate whether the electrochemical reaction involves oxidation of hydrogen or carbon monoxide. Hence in the present model it is considered that the oxidation of hydrogen occurs on the anode-electrolyte interface [6,14]. The hydrogen oxidation occurring at electrodes is as follows:…”

Section: Model Descriptionmentioning

confidence: 99%

“…As indicated in Equation (14), there are N ( 5 5) equilibrium equations, one for each species, along with w ( 5 3) material balance equations, one for each elements, a total of N1w equations and the same number of unknowns. In the present work, Newton-Raphson's method is used to solve this set of equations to obtain molar concentrations, y i , for all components present in the reactions.…”

Section: Sofc Modelmentioning

confidence: 99%

“…The cell properties involve materials, macro and microstructures of electrolyte and electrodes. The activation overpotential for each electrode can be calculated as follows [14]:…”

Section: Sofc Modelmentioning

confidence: 99%

“…where E is the activation energy, a˜is an empirical preexponential coefficient, P Ã H 2 the partial pressure of hydrogen, P Ã H 2 O the partial pressure of water and P 0 is the reference pressure [14,21]. Concentration overpotential is a result of the change in concentration of the reactants at the surface of the electrodes as the fuel and oxidant diffuse through the porous electrodes.…”

Section: Sofc Modelmentioning

confidence: 99%

“…where superscripts ( o ) and ( Ã ) stand for species concentrations at bulk flow and active sites, respectively [14] and can be calculated by the solution of mass conservation equations. Ohmic overpotential is caused by the flow of electric charge across electrodes and electrolyte.…”

Section: Mass Balancementioning

confidence: 99%

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Performance analysis of a tubular solid oxide fuel cell with an indirect internal reformer

Hosseini

Jafarian

Karimi

2011

Int. J. Energy Res.

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SUMMARYA 2-D steady-state mathematical model of a tubular solid oxide fuel cell with indirect internal reforming (IIR-SOFC) has been developed to examine the chemical and electrochemical processes and the effect of different operating parameters on the cell performance. The conservation equations for energy, mass, momentum as well as the electrochemical equations are solved simultaneously employing numerical techniques. A co-flow configuration is considered for gas streams in the air and fuel channels. The heat radiation between the preheater and reformer surface is incorporated into the model and local heat transfer coefficients are determined throughout the channels. The model predictions have been compared with the data available in the literature. The model was used to study the effect of various operating conditions on the cell performance. Numerical results indicate that as the cell operating pressure increases, the reforming reaction extends to a larger portion of the cell and the maximum temperature move away from the cell inlet. As a result, a more uniform temperature prevails in the solid structure which reduces thermal stresses. Also, at higher excess air, the rate of heat transfer to the air stream is augmented and the average cell temperature is decreased.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Sofc Modelmentioning

confidence: 99%

“…The cell properties involve materials, macro and microstructures of electrolyte and electrodes. The activation overpotential for each electrode can be calculated as follows [14]:…”

Section: Sofc Modelmentioning

confidence: 99%

Section: Sofc Modelmentioning

confidence: 99%

Section: Mass Balancementioning

confidence: 99%

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Performance analysis of a tubular solid oxide fuel cell with an indirect internal reformer

Hosseini

Jafarian

Karimi

2011

Int. J. Energy Res.

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Fuel Cells for Marine Applications

Leites¹

2016

Fuel Cells : Data, Facts and Figures

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Effect of operation parameters on performance of tubular solid oxide fuel cell

et al. 2007

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in Wiley InterScience (www.interscience.wiley.com).A simulation model is developed to analyze steady state and transient operation of a tubular solid oxide fuel cell (SOFC). The performance of the tubular SOFC is compared when the operation parameters such as inlet fuel temperature, inlet oxidant temperature, and inlet oxidant flow rate are changed, respectively. The model includes both electrochemical model and thermal model. The electrochemical model includes the Nernst potential, ohmic polarization, activation polarization, and concentration polarization. The thermal model includes the heat transfer by conduction, convention, and radiation. An analysis is carried out to investigate the effects of the different operation parameters on the hot spot, solid temperature gradient at the steady state, and the response time at the transient state. Numerical results show that the performance of tubular SOFC due to the change of the different operation parameters is different at the steady state. For the transient response such as the same step increase in cell current density, the response time required for the new steady state is different as different operation parameters are changed.

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Two-dimensional transient model of a cascaded micro-tubular solid oxide fuel cell fed with methane

Cited by 35 publications

References 7 publications

Performance analysis of a tubular solid oxide fuel cell with an indirect internal reformer

Performance analysis of a tubular solid oxide fuel cell with an indirect internal reformer

Fuel Cells for Marine Applications

Effect of operation parameters on performance of tubular solid oxide fuel cell

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