MODELING AND PERFORMANCE ANALYSIS OF SOLID OXIDE FUEL CELLS (SOFC)
MOHAMED EL-SAYED ALY MOHAMED YOUSSEF;
Abstract
The performance of planar and tubular Solid Oxide Fuel Cells (SOFCs) has been studied numerically by developing a simplified lumped model and two• dimensional detailed model. A FORTRAN program has been written to calculate the mass and energy balance equations, and to solve the simultaneous linear equations (Nemst, energy, and Ohms law) by using Gaussian elimination with backward substitution. The main assumptions of the simplified lumped model are considering Ohmic polarization for (cathode, electrolyte, and anode) at average operating temperature and the concentration polarization while activation polarization is ignored. The simplified lumped model assumes the SOFC is an adiabatic system; the reactants and products are treated as ideal gases.
The calculated results (cell voltage and power density) for different operating cell pressures obtained by simplified model have been compared with experimental data published in the literature. The verification of calculated results obtained by simplified model showed good agreement between the predicted data and experimental results.
A parametric analysis has been carried out for tubular and planar SOFCs to study the effect of different parameters on the SOFC voltage and power density. The planar and tubular SOFCs performance (cell voltage and cell power density) are calculated at different operating cell pressures, 1 bar, 3 bar, 5 bar, and 10 bar. The performance of the SOFCs has been evaluated at different inlet fuel flow rates with fixed excess air factor (A.a), (A.a= 6 for tubular and A.a= 5.5 for planar SOFCs). The enhancement of using pure oxygen instead of air as oxidant has been determined for both configurations SOFC. The effect of using different excess air factor (5.5, 4.0, and
2.0, respectively) on the performance of the planar SOFC has been studied.
Two-dimensional detailed model of the planar SOFC for cross-section half cell (cathode and electrolyte) has been developed to study the ionic and electronic current density and potential distributions in the cathode as well as ionic current density and ionic potential distributions in the electrolyte. The model predicts the transport of gaseous species in the cathode by solving Maxwell-Stefan diffusion and convection
The calculated results (cell voltage and power density) for different operating cell pressures obtained by simplified model have been compared with experimental data published in the literature. The verification of calculated results obtained by simplified model showed good agreement between the predicted data and experimental results.
A parametric analysis has been carried out for tubular and planar SOFCs to study the effect of different parameters on the SOFC voltage and power density. The planar and tubular SOFCs performance (cell voltage and cell power density) are calculated at different operating cell pressures, 1 bar, 3 bar, 5 bar, and 10 bar. The performance of the SOFCs has been evaluated at different inlet fuel flow rates with fixed excess air factor (A.a), (A.a= 6 for tubular and A.a= 5.5 for planar SOFCs). The enhancement of using pure oxygen instead of air as oxidant has been determined for both configurations SOFC. The effect of using different excess air factor (5.5, 4.0, and
2.0, respectively) on the performance of the planar SOFC has been studied.
Two-dimensional detailed model of the planar SOFC for cross-section half cell (cathode and electrolyte) has been developed to study the ionic and electronic current density and potential distributions in the cathode as well as ionic current density and ionic potential distributions in the electrolyte. The model predicts the transport of gaseous species in the cathode by solving Maxwell-Stefan diffusion and convection
Other data
| Title | MODELING AND PERFORMANCE ANALYSIS OF SOLID OXIDE FUEL CELLS (SOFC) | Other Titles | نمذجة وتحليل اداء خلايا وقود الاوكسيد الصلب | Authors | MOHAMED EL-SAYED ALY MOHAMED YOUSSEF | Issue Date | 2004 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| B15023.pdf | 932.55 kB | Adobe PDF | View/Open |
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