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Research Papers

One-Dimensional Model of a Tubular Solid Oxide Fuel Cell

[+] Author and Article Information
Francesco Calise1

DETEC, Università degli Studi di Napoli Federico II, Piazzale Tecchio 80, 80125 Naples, Italyfrcalise@unina.it

Massimo Dentice d’Accadia

DETEC, Università degli Studi di Napoli Federico II, Piazzale Tecchio 80, 80125 Naples, Italydentice@unina.it

Adolfo Palombo

DETEC, Università degli Studi di Napoli Federico II, Piazzale Tecchio 80, 80125 Naples, Italypalombo@unina.it

Laura Vanoli

Dipartimento di Scienza degli Alimenti, Università degli Studi di Napoli Federico II, Via Università 100, 80055 Portici, Napoli, Italylaura.vanoli@unina.it

1

Corresponding author.

J. Fuel Cell Sci. Technol 5(2), 021014 (Apr 21, 2008) (15 pages) doi:10.1115/1.2784296 History: Received November 30, 2005; Revised June 08, 2006; Published April 21, 2008

In this paper, a detailed model of a solid oxide fuel cell (SOFC) tube is presented. The SOFC tube is discretized along its longitudinal axis. Detailed models of the kinetics of the shift and reforming reactions are introduced in order to evaluate their rates along the SOFC axis. Energy, moles, and mass balances are performed for each slice of the components under investigation, allowing the calculation of temperature profiles. Friction factors and heat-exchange coefficients are calculated by means of experimental correlations. As for the SOFC overvoltages, the activation overvoltage is calculated using the Butler–Volmer equation and semiempirical correlations for the exchange current density, Ohmic losses are evaluated introducing an appropriate electrical scheme and material resistivities, and concentration overvoltage is calculated by means of both binary and Knudsen diffusion coefficients. On the basis of this model, a case study is presented and discussed, in which temperatures, pressures, chemical compositions, and electrical parameters are evaluated for each slice of the SOFC tube under investigation. Finally, a sensitivity analysis is performed, in order to investigate the influence of the design parameters on the performance of the system.

Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 7

Concentration and activation overvoltages.

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Heat-exchange coefficients

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Figure 11

Fuel molar flow rates

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Figure 12

Sensitivity analysis: varying cell length

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Figure 13

Sensitivity analysis: varying cell voltage

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Figure 14

Sensitivity analysis: varying inlet pressure

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Figure 15

Sensitivity analysis: varying fuel molar flow rate

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Figure 16

Sensitivity analysis: varying H2 molar flow rate

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Figure 1

SOFC tubular arrangement

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Figure 2

SOFC tube discretization

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Figure 6

Nernst potential and Ohmic overvoltage

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Figure 4

Heat from reactions

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