An Experimental Investigation on Simultaneous Effects of Oxygen Ratio and Flow-Rate in SOFCs Performance Fueled by a Mixture of Methane and Oxygen

Document Type : Research Paper


1 Mech. Eng. Dept., Faculty of Eng., Ferdowsi University of Mashhad, Iran

2 a Mech. Eng. Dept., Faculty of Eng., Ferdowsi University of Mashhad, Iran

3 Niroo Research Institute (NRI)


Catalytic partial oxidation (CPOX) has recently received particular attention because it is one of the most attractive technologies for the production of syngas and hydrogen in small to medium scales. Current study subjected to partial oxidation reforming which have simultaneously studied the effect of the fuel composition and flow rates of methane-oxygen mixed gas on the SOFCs performances. In this regard, the Reynolds number at the fuel channel inlet represents the mixture of methane and air mass flow rate. Moreover, the amount of oxygen ratio indicates the fuel composition. The results showed that the peak of power density (PPD) strongly depends upon both the Reynolds number at the fuel channel inlet and oxygen ratio. However, with the changes in Reynolds number or oxygen ratio, the oscillating behavior of PPD was observed. A dimensionless parameter can be introduced to take into account simultaneously the effect of oxygen ratio and Reynolds number of fuel on the PPD value. Considering the risk of carbon deposition as a constraint for selecting of oxygen ratio, the highest PPD corresponds to the methane/oxygen flow rates of 100/20 ccm for the applied methane/oxygen flow rates. The electrochemical experimental testing showed a stable performance of the SOFC in this condition and confirmed its durability after 120 hours testing.


Main Subjects

[1] A. Di Filippi, Development and experimental validation of CPOx reforming dynamic model for fault detection and isolation in SOFC systems, (2015).
 [2]  M. Sorrentino, C. Pianese, Control oriented modeling of solid oxide fuel cell auxiliary power unit for transportation applications, Journal of Fuel Cell Science and Technology, 6 (2009) 041011.
[3]   D. Hickman, L.D. Schmidt, Steps in CH4 oxidation on Pt and Rh surfaces: High‐temperature reactor simulations, AIChE Journal, 39 (1993) 1164-1177.
[4]  S.C. Singhal, K. Kendall, High-temperature solid oxide fuel cells: fundamentals, design and applications, Elsevier, (2003) 1-20.
[5] M. Sorrentino, Development of a hierarchical structure of models for simulation and control of planar solid oxide fuel cells, Department of Mechanical Engineering, University of Salerno, Italy, (2006).
[6]  H. Zhang, J. Chen, J. Zhang, Performance analysis and parametric study of a solid oxide fuel cell fueled by carbon monoxide, International Journal of Hydrogen Energy, 38 (2013) 16354-16364.
[7]  H. Xu, B. Chen, H. Zhang, W. Kong, B. Liang, M. Ni, The thermal effect in direct carbon solid oxide fuel cells, Applied Thermal Engineering, 118 (2017) 652-662.
[8] S. Cordiner, M. Feola, V. Mulone, F. Romanelli, Analysis of a SOFC energy generation system fuelled with biomass reformate, Applied Thermal Engineering, 27 (2007) 738-747.
[9]  L. Fan, L. Van Biert, A.T. Thattai, A. Verkooijen, P. Aravind, Study of methane steam reforming kinetics in operating solid oxide fuel cells: influence of current density, International Journal of Hydrogen Energy, 40 (2015) 5150-5159.
[10] Y. Wang, F. Yoshiba, M. Kawase, T. Watanabe, Performance and effective kinetic models of methane steam reforming over Ni/YSZ anode of planar SOFC, International Journal of Hydrogen Energy, 34 (2009) 3885-3893.
[11] V. Liso, G. Cinti, M.P. Nielsen, U. Desideri, Solid oxide fuel cell performance comparison fueled by methane, MeOH, EtOH and gasoline surrogate C8H18, Applied Thermal Engineering, 99 (2016) 1101-1109.
[12]  Y. Yang, X. Du, L. Yang, Y. Huang, H. Xian, Investigation of methane steam reforming in planar porous support of solid oxide fuel cell, Applied Thermal Engineering, 29 (2009) 1106-1113.
[13]  M. Martinelli, Application of the spatially resolved
sampling technique to the analysis and optimal design of a
CH4-CPO reformer with honeycomb catalyst,University of POLITECNICO DI MILANO,Faculty of Engineering of Industrial Processes Department of Energy, Phd Thesis (2011),5-121.
[14]  S. Sui, G. Xiu, 14-Fuels and fuel processing in SOFC applications, in:  High-temperature Solid Oxide Fuel Cells for the 21st Century, Academic Press Boston, (2016) 461-495.
[15]  T. Lakshmi, P. Geethanjali, P.S. Krishna, Mathematical modelling of solid oxide fuel cell using Matlab/Simulink, in:  2013 Annual International Conference on Emerging Research Areas and 2013 International Conference on Microelectronics, Communications and Renewable Energy, IEEE, (2013) 1-5.
[16] D. Lee, J. Myung, J. Tan, S.-H. Hyun, J.T. Irvine, J. Kim, J. Moon, Direct methane solid oxide fuel cells based on catalytic partial oxidation enabling complete coking tolerance of Ni-based anodes, Journal of Power Sources, 345 (2017) 30-40.
[17]  B.E. Buergler, A.N. Grundy, L.J. Gauckler, Thermodynamic equilibrium of single-chamber SOFC relevant methane–air mixtures, Journal of The Electrochemical Society, 153 (2006) A1378-A1385.
[18]  A. Baldinelli, L. Barelli, G. Bidini, A. Di Michele, R. Vivani, SOFC direct fuelling with high-methane gases: Optimal strategies for fuel dilution and upgrade to avoid quick degradation, Energy Conversion and Management 124 (2016), 492-503.
[19]  F. Priyakorn, N. Laosiripojana, S. Assabumrungrat, Modeling of solid oxide fuel cell with internal reforming operation fueled by natural gas, Journal of Sustainable Energy & Environment, 2 (2011), 187-194.
[20]  B.E. Poling, J.M. Prausnitz, J.P. O'connell, The properties of gases and liquids, Mcgraw-hill New York, 2001.
[21]   M.J. Rhodes, M. Rhodes, Introduction to particle technology, John Wiley & Sons, 2008.
[22]   O. Yamamoto, Solid oxide fuel cells: fundamental aspects and prospects, Electrochimica acta, 45 (2000) 2423-2435.
[23]   C.O. Colpan, F. Hamdullahpur, I. Dincer, Transient heat transfer modeling of a solid oxide fuel cell operating with humidified hydrogen, International Journal of Hydrogen Energy, 36 (2011) 11488-11499.
[24]   P. Iora, P. Aguiar, C. Adjiman, N. Brandon, Comparison of two IT DIR-SOFC models: Impact of variable thermodynamic, physical, and flow properties. Steady-state and dynamic analysis, Chemical Engineering Science, 60 (2005) 2963-2975.
[25]   Y. Lin, Z. Zhan, J. Liu, S.A. Barnett, Direct operation of solid oxide fuel cells with methane fuel, Solid State Ionics, 176 (2005) 1827-1835.
[26]   H. Aslannejad, L. Barelli, A. Babaie, S. Bozorgmehri, Effect of air addition to methane on performance stability and coking over NiO–YSZ anodes of SOFC, Applied Energy, 177 (2016) 179-186.
[27]  M. Pillai, Y. Lin, H. Zhu, R.J. Kee, S.A. Barnett, Stability and coking of direct-methane solid oxide fuel cells: Effect of CO2 and air additions, Journal of Power Sources, 195 (2010) 271-279.