A detailed model for transport processes in a methane fed planar SOFC

Vakouftsi, E.; Marnellos, George; Athanasiou, C.; Coutelieris, Frank A.

doi:10.1016/j.cherd.2010.05.003

Cited by 16 publications

(8 citation statements)

References 22 publications

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“…For describing the reaction kinetics of MSR and WGSR, global reaction schemes are widely used due to their easy implementation and less computational time [11][12][13][14][15][16][17]. Detailed elementary reaction schemes are also employed for internal reforming SOFCs [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Extensive experimental and modeling studies have been performed to understand the methane internal steam reforming (MSR) and water gas shift reaction (WGSR) kinetics in SOFCs and their effects on SOFC performance [11][12][13][14][15][16][17][18][19][20][21][22][23]. For describing the reaction kinetics of MSR and WGSR, global reaction schemes are widely used due to their easy implementation and less computational time [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Modeling and parametric simulations of solid oxide fuel cells with methane carbon dioxide reforming

2013

Energy Conversion and Management

119

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and parametric simulations of solid oxide fuel cells with methane carbon dioxide reforming

2013

Energy Conversion and Management

119

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“…They argued that a minimum quantity of water would be required to avoid carbon deposition. Vakouftsi et al 38 employed business ACE CFD to simulate a 3D planar SOFC. The SOFC was fed by a mixture of methane and steam at H 2 O/CH 4 ratios that would prevent carbon deposition.…”

Section: Introductionmentioning

confidence: 99%

A numerical study to determine proper steam-to-fuel ratio in a biogas-fueled solid oxide fuel cell for different levels of biogas methane content

Mehrabian

Mahmoudimehr

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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It is vital to find the optimal quantity of water added to the fuel in a biogas-fueled Solid Oxide Fuel Cell (SOFC). An under-optimal water quantity can impede steam reforming reactions, while an over-optimal quantity of water (which is equivalent to reduced biogas portion) may reduce the performance of the fuel cell due to a shortage of fuel. Water production in electrochemical reactions and the carbon deposition constraint add to the complexity of water quantity optimization. The present work develops a 3D numerical model to simulate a direct biogas-fueled SOFC to find the optimal steam/biogas (S/C) ratio. Several biogas mixtures (CH4/CO2 ratios) are analyzed. For each mixture, a wide range of S/C ratios is evaluated in a wide range of voltages. It is found that the polarization curves corresponding to different S/C ratios intersect each other for a given biogas mixture. In other words, an S/C ratio can be optimal at some voltages and non-optimal at others. Based on power density maximization as an explicit criterion, the optimal S/C ratio is found to be 0.75 at low CH4 molar fractions (~50%) and 1.25 at high CH4 molar fractions (~75%).

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“…In the absence of detailed oxidation mechanisms, previous researchers have used a few approaches to model syngas oxidation in a SOFC: (1) a global reaction approach (16,17); (2) using only O 2 electrochemistry models (18); and (3) neglecting CO electrochemistry (19)(20)(21)(22)(23). Global reaction models apply a general Butler-Volmer equation to relate current to anodic activation overpotential based on the global H 2 and CO oxidation reactions.…”

Section: Introductionmentioning

confidence: 99%

Detailed H₂ and CO Electrochemistry for a MEA Model Fueled by Syngas

2015

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SOFCs can directly oxidize CO in addition to H2, which allows them to be coupled to a gasifier. Many membrane-electrode-assembly (MEA) models neglect CO electrochemistry due to sluggish kinetics and the water-gas-shift reaction, but CO oxidation may be important for high CO-content syngas. The 1D-MEA model presented here incorporates detailed mechanisms for both H2 and CO oxidation, individually fitted to experimental data. These mechanisms are then combined into a single model, which provides a good fit to experimental data for H2/CO mixtures. Furthermore, the model fits H2/CO data best when a single charge-transfer step in the H2 mechanism is assumed to be rate-limiting for all current densities. This differs from the result for H2/H2O mixtures, where H2 adsorption becomes rate-limiting at high current densities. These results indicate that CO oxidation cannot be neglected in MEA models running on CO-rich syngas, and that CO oxidation can alter the H2 oxidation mechanism.

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A detailed model for transport processes in a methane fed planar SOFC

Cited by 16 publications

References 22 publications

Modeling and parametric simulations of solid oxide fuel cells with methane carbon dioxide reforming

Modeling and parametric simulations of solid oxide fuel cells with methane carbon dioxide reforming

A numerical study to determine proper steam-to-fuel ratio in a biogas-fueled solid oxide fuel cell for different levels of biogas methane content

Detailed H₂ and CO Electrochemistry for a MEA Model Fueled by Syngas

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A detailed model for transport processes in a methane fed planar SOFC

Cited by 16 publications

References 22 publications

Modeling and parametric simulations of solid oxide fuel cells with methane carbon dioxide reforming

Modeling and parametric simulations of solid oxide fuel cells with methane carbon dioxide reforming

A numerical study to determine proper steam-to-fuel ratio in a biogas-fueled solid oxide fuel cell for different levels of biogas methane content

Detailed H2 and CO Electrochemistry for a MEA Model Fueled by Syngas

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Detailed H₂ and CO Electrochemistry for a MEA Model Fueled by Syngas