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RESEARCH PAPERS

Comprehensive Numerical Modeling and Analysis of a Cell-Based Indirect Internal Reforming Tubular SOFC

[+] Author and Article Information
Takafumi Nishino1

Department of Mechanical Engineering, Kyoto University, Kyoto, 606-8501, Japan

Hiroshi Iwai2

Department of Mechanical Engineering, Kyoto University, Kyoto, 606-8501, Japaniwai@mech.kyoto-u.ac.jp

Kenjiro Suzuki

Department of Machinery and Control Systems, Shibaura Institute of Technology, Saitama, 337-8570, Japanksuzuki@sic.shibaura-it.ac.jp

1

Current affiliation: School of Engineering Sciences, University of Southampton, United Kingdom.

2

Corresponding author.

J. Fuel Cell Sci. Technol 3(1), 33-44 (Feb 01, 2006) (12 pages) doi:10.1115/1.2133804 History:

A comprehensive numerical model of an indirect internal reforming tubular Solid Oxide Fuel Cell (IIR-T-SOFC) has been developed. Two-dimensional axisymmetry of the velocity, temperature, and mass transfer fields was assumed in the model, but accommodating the peripheral nonuniformity of electric potential and electric current fields in the tubular cell for the case with internal reforming and electrochemical reactions. By using the developed model, it was examined how the thermal field and power generation characteristics of the cell are affected by gas inlet conditions and filling pattern of the reforming catalyst inside the fuel feed tube. In particular, optimization of the catalyst distribution pattern was demonstrated to be effective in the reduction of the maximum temperature and temperature gradient, in the mitigation of the possible appearance of a hot spot and therefore in making the life of a fuel cell longer with little loss of the power generation performance of the cell.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic view of a single cell of IIR-T-SOFCs

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Figure 2

Schematic view of a cell stack

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Figure 3

Overall picture of the IIR-T-SOFC model

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Figure 9

Molar fraction contours of each chemical species for the Base case (iav=3926A∕m2)

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Figure 11

Current density distributions in the electrolyte for the Base case (iav=3926A∕m2)

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Figure 12

EMF distributions for the Base case (iav=3926A∕m2)

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Figure 13

Activation overpotential distributions for the Base case (iav=3926A∕m2)

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Figure 14

Ohmic loss distributions for the Base case (iav=3926A∕m2)

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Figure 15

Distribution patterns of all the factors causing voltage drops of the cell (Base case, iav=3926A∕m2)

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Figure 16

Cell terminal voltage and losses/overpotentials versus average current density (Base case)

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Figure 17

Energy conversion efficiency and output power versus average current density (Base case)

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Figure 18

Temperature contours for Cases T-750 and A-40

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Figure 19

Temperature gradients in the electrolyte for Cases T-750, and A-40 and the Base case

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Figure 20

Temperature contours for Cases C-02U and C-04L

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Figure 21

Temperature gradients in the electrolyte for Cases C-02U and C-04L and the Base case

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Figure 22

Molar flow rate of H2 and CH4 inside the feed tube for Cases C-02U and C-04L and the Base case

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Figure 4

Computational domain for the gas flow field (inside the broken line) and chemical reactions considered in the numerical model

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Figure 5

Equivalent electrical circuit in the cell tube

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Figure 6

Velocity vector plots for the Base case

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Figure 7

Temperature contours for the Base case

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Figure 8

Temperature gradients in the electrolyte for the Base case

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Figure 10

Molar flow rate of each chemical species for the Base case

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