Three-dimensional CFD modeling of transport phenomena in anode-supported planar SOFCs
Tóm tắt
In this study, a three-dimensional computational fluid dynamics model has been developed for an anode-supported planar SOFC. The conservation equations of mass, momentum, species/charges and thermal energy are solved by finite volume method for a complete unit cell consisting of 13 parallel channels in both anode and cathode. The simulation results of the developed model are well in agreement with the experimental data obtained at same conditions. In this study, the co-flow arrangement with hydrogen utilization of 60 % and operating voltage of 0.7 V is used as the base case, and compared with the counter-flow arrangement. The predicted results reveals that the maximum temperature obtained in the counter-flow arrangement is about 10 °C lower than that of co-flow, but the counter-flow arrangement has a higher temperature gradient between the respective anodes and cathodes in a cross-section normal to the main flow direction, especially in the air inlet region of the cell (x = 0.04 m),which is very harmful to the lifetime of materials. The current density is very unevenly distributed along and normal to the flow direction for both the co- and counter-flow arrangements, and the maximum values occur at junctions of the electrodes, channels and ribs, which causes higher over-potentials and ohmic heating.
Tài liệu tham khảo
Singhal SC, Kendall K (2003) High temperature solid oxide fuel cell: fundamentals, design and applications. Elsevier Advanced Technology, Oxford
I. EG & G Technical Services, Inc. Fuel Cell Handbook. 7th ed. U.S. Dep. Energy, Office of Fossil Energy, Nat. Energy Technol. Lab., 2004
Mogensen D, Grunwaldt J-D, Hendriksen PV, Dam-Johansen K, Nielsen JU (2011) Internal steam reforming in solid oxide fuel cells: status and opportunities of kinetic studies and their impact on modeling. J Power Sources 196:25–38
Li TS, Miao H, Chen T, Wang WG, Xu C (2009) J Electrochem Soc 156:1383
Li TS, Wang WG, Miao H, Chen T, Xu C (2010) J Alloys Compd 495:138
Aguiar P, Adjiman CS, Brandon NP (2004) Anode-supported intermediate temperature direct internal reforming solid oxide fuel cell. I: model-based steady-state performance. J Power Sources 138:120–136
Patcharavorachor Y, Arpornwichanop A, Chuachuebsuk A (2001) Electrochemical study of a planar solid oxide fuel cell: role of support structures. J Power Sources 93:130–140
Hussain MM, Li X, Dincer I (2007) Mathematical modeling of transport phenomena in porous SOFC anodes. Int J Therm Sci 46:48–86
Kanno D, Shikazono N, Takagi N, Matsuzaki K, Kasagi N (2011) Electochim Acta 56:4015–4021
Iwai H, Shikazono N, Matsui T, Teshima H, Kishimoto M, Kishida R, Hayashi D, Matsuzaki K, Kanno D, Saito M, Muroyama H, Eguchi K, Kasagi N, Yoshida H (2010) J Power Sources 195:955–961
Andersson M (2012) Solid oxide fuel cell modeling at the cell scale: [Doctoral dissertation]. Lund University, Sweden