Numerical investigation of the chemical and electrochemical characteristics of planar solid oxide fuel cell with direct internal reforming

Abstract

A fully three-dimensional mathematical model of a planar solid oxide fuel cell (SOFC) with complete direct internal steam reforming was constructed to investigate the chemical and electrochemical characteristics of the porous-electrode-supported (PES)-SOFC developed by the Central Research Institute of Electric Power Industry of Japan. The effective kinetic models developed over the Ni/YSZ anode takes into account the heat transfer and species diffusion limitations in this porous anode. The models were used to simulate the methane steam reforming processes at the co- and counter-flow patterns. The results show that the flow patterns of gas and air have certain effects on cell performance. The cell at the counter-flow has a higher output voltage and output power density at the same operating conditions. At the counter-flow, however, a high hotspot temperature is observed in the anode with a non-fixed position, even when the air inlet flow rate is increased. This is disadvantageous to the cell. Both cell voltage and power density decrease with increased air flow rate.

Keywords

planar solid oxide fuel cell (SOFC) / direct internal reforming / chemical reaction / methane / electrochemical

References

[1] .National Energy Technology Laboratory. Fuel Cell Handbook. 7th Ed. Technical Report DOE/NETL 2004/1206, Morgantown, WV (2002); available at: http://www.brennstoffzellen.rwth-aachen.de/Links/FCHandbook7.pdf.

[2] Bavarsad P G. Energy and exergy analysis of internal reforming solid oxide fuel cell-gas turbine hybrid system. International Journal of Hydrogen Energy, 2007, 32(17): 4591-4599

[3] Aguiar P, Adjiman C S, Brandon N P. Anode-supported intermediate temperature direct internal reforming solid oxide fuel cell. I: Model-based steady-state performance. Journal of Power Sources, 2004, 138(1-2): 120-136

[4] Colpan C O, Dincer I, Hamdullahpur F. Thermodynamic modeling of direct internal reforming solid oxide fuel cells operating with syngas. International Journal of Hydrogen Energy, 2007, 32(7): 787-795

[5] Boder M, Dittmeyer R. Catalytic modification of conventional SOFC anodes with a view to reducing their activity for direct internal reforming of natural gas. Journal of Power Sources, 2006, 155(1): 13-22

[6] Haseli Y, Dincer I, Naterer G F. Thermodynamic modeling of a gas turbine cycle combined with a solid oxide fuel cell. International Journal of Hydrogen Energy, 2008, 33(20): 5811-5822

[7] Sangtongkitcharoen W, Assabumrungrat S, Pavarajarn V, Laosiripojana N, Praserthdam P. Comparison of carbon formation boundary in different modes of solid oxide fuel cells fueled by methane. Journal of Power Sources, 2005, 142(1): 75-80

[8] Wang Q S, Li L J, Wang C. Numerical study of thermoelectric characteristics of a planar solid oxide fuel cell with direct internal reforming of methane. Journal of Power Sources, 2009, 186(2): 399-407

[9] Finnerty C M, Ormerod R M. Internal reforming over nickel/zirconia anodes in SOFCS oparating on methane: influence of anode formulation, pre-treatment and operating conditions. Journal of Power Sources, 2000, 86(1-2): 390-394

[10] Peters R, Dahl R, Klüttgen U, Palm C, Stolten D. Internal reforming of methane in solid oxide fuel cell systems. Journal of Power Sources, 2002, 106(1-2): 238-244

[11] Seo Y S, Shirley A, Kolaczkowski S T. Evaluation of thermodynamically favourable operating conditions for production of hydrogen in three different reforming technologies. Journal of Power Sources, 2002, 108(1-2): 213-225

[12] Hou K, Hughes R. The kinetics of methane steam reforming over a Ni/α-Al₂O catalyst. Chemical Engineering Journal, 2001, 82(1-3): 311-328

[13] Clarke S H, Dicks A L, Pointon K, Smith T A, Swann A. Catalytic aspects of the steam reforming of hydrocarbons in internal reforming fuel cells. Catalysis Today, 1997, 38(4): 411-423

[14] Zhu H Y, Kee R J. A general mathematical model for analyzing the performance of fuel-cell membrane-electrode assemblies. Journal of Power Sources, 2003, 117(1-2): 61-74

[15] Wang Y Z, Yoshiba F, Watanabe T, Weng S L. Numerical analysis of electrochemical characteristics and heat/species transport for planar porous-electrode-supported SOFC. Journal of Power Sources, 2007, 170(1): 101-110

[16] Wang Y Z, Yoshiba F, Kawase M, Watanabe T. Performance and effective kinetic models of methane steam reforming over Ni/YSZ anode of planar SOFC. International Journal of Hydrogen Energy, 2009, 34(9): 3885-3893

[17] Wang Y Z, Li Y X, Weng S L, Wang Y H. Numerical simulation of counter-flow spray saturator for humid air turbine cycle. Energy, 2007, 32(5): 852-860

[18] Todd B, Young J B. Thermodynamic and transport properties of gases for use in solid oxide fuel cell modelling. Journal of Power Sources, 2002, 110(1): 186-200

[19] Chan S H, Khor K A, Xia Z T. A complete polarization model of a solid oxide fuel cell and its sensitivity to the change of cell component thickness. Journal of Power Sources, 2001, 93(1-2): 130-140

[20] Hwang J J, Chen C K, Lai D Y. Computational analysis of species transport and electrochemical characteristics of a MOLB-type SOFC. Journal of Power Sources, 2005, 140(2): 235-242

[21] Xu J, Froment G F. Methane steam reforming machination and water gas shift-I. Intrinsic kinetics. American Institute of Chemical Engineers, 1989, 35(1): 88-96

[22] Costamagna P, Selimovic A, Del M B, Agnew G. Electrochemical model of the integrated planar solid oxide fuel cell (IP-SOFC). Chemical Engineering Journal, 2004, 102(1): 61-69

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