0
RESEARCH PAPERS

Analysis of Chemically Reacting Transport Phenomena in an Anode Duct of Intermediate Temperature SOFCs

[+] Author and Article Information
Jinliang Yuan

Department of Energy Sciences, Lund Institute of Technology, Box 118, 22100 Lund, Sweden

Bengt Sundén1

Department of Energy Sciences, Lund Institute of Technology, Box 118, 22100 Lund, Swedenbengt.sunden@vok.lth.se

1

Corresponding author.

J. Fuel Cell Sci. Technol 3(2), 89-98 (Aug 17, 2005) (10 pages) doi:10.1115/1.2173662 History: Received March 08, 2005; Revised August 17, 2005

The internal reforming and electrochemical reactions appear in the porous anode layer, and may lead to inhomogeneous temperature and gas species distributions according to the reaction kinetics. In this study, a fully three-dimensional calculation method has been further developed to simulate and analyze chemically reacting transport processes in a thick anode duct. The composite duct investigated consists of a porous anode, the fuel flow duct and solid current connector. Momentum and heat transport together with gas species equations have been solved by coupled source terms and variable thermophysical/transport properties of the fuel gas mixture. Furthermore, the heat transfer due to the fuel gas diffusion is implemented into the energy balance based on multicomponent diffusion models. The fuel cell conditions such as the combined thermal boundary conditions on solid walls, mass balances (generation and consumption) associated with the various reactions, and gas permeation between the porous anode and flow duct are applied in the analysis. Simulation results show that the internal reforming and the electrochemical reactions, and cell operating conditions are significant for species distribution, fuel gas transport and heat transfer in the subdomains of the anode.

FIGURES IN THIS ARTICLE
<>
Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

(a) Structure of a unit cell; (b) schematic drawing of a composite anode duct in ITSOFCs

Grahic Jump Location
Figure 2

Fully developed Nusselt number Nu variation in a parallel plate duct with Darcy number (Da=β∕h2), compared to the analytical ones from (12)

Grahic Jump Location
Figure 3

Distribution of (a) steam reforming reaction rate Rr; and (b) shift reaction rate Rs along main flow direction at the base case

Grahic Jump Location
Figure 4

Cross-sectional steam reforming reaction rate Rr distribution at (a) the inlet; (b) the one-fourth; and (c) the half length from the inlet of an ITSOFC duct

Grahic Jump Location
Figure 5

Distribution of (a) dimensionless axial velocity contours (U∕Uin); and (b) temperature along the main flow stream of an ITSOFC anode duct at the base case condition

Grahic Jump Location
Figure 8

(a) CO; and (b) H2O mass concentration distribution along main flow direction of an ITSOFC anode duct at the base case condition

Grahic Jump Location
Figure 9

CH4 distribution at (a) 900°C; (b) 700°C; and (c) 600°C along the main flow direction of an ITSOFC anode duct

Grahic Jump Location
Figure 6

Mass concentration of (a) CH4; and (b) H2 along main flow direction of an ITSOFC anode duct at the base case condition

Grahic Jump Location
Figure 7

Cross-sectional CH4 mass concentration distribution at (a) the inlet; (b) the one-fourth; and (c) the half length from the inlet of an ITSOFC duct

Grahic Jump Location
Figure 10

Temperature distribution at (a) 700°C and (b) 900°C along the main flow direction of an ITSOFC anode duct

Grahic Jump Location
Figure 11

Dimensionless axial velocity contours distribution at (a) β=2.0×10−11; (b) β=2.0×10−9 along the main flow direction of an ITSOFC anode duct

Grahic Jump Location
Figure 12

(a) Steam reforming reaction rate Rr; (b) water-gas shift reaction rate Rs; (c) CH4 distribution at β=2.0×10−9 along the main flow direction of an ITSOFC anode duct

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In