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Research Papers

Analysis of Performance and Thermal-Fluid Characteristics in a Planar Type Solid Oxide Fuel Cell

[+] Author and Article Information
Hyojung Ahn1

 Korea Aerospace Research Institute, 115 Gahwangno, Yuseong-gu, Daejeon 305-333, South Koreahjahn@kari.re.kr

1

Corresponding author.

J. Fuel Cell Sci. Technol 9(3), 031008 (Apr 20, 2012) (8 pages) doi:10.1115/1.4006054 History: Received November 13, 2011; Revised December 23, 2011; Published April 19, 2012; Online April 20, 2012

This work studied internal loss factors (flow rate, pressure, partial pressure, voltage, current, temperature, etc.) in a unit cell and stack of solid oxide fuel cells (SOFC) with different separator materials, operation temperature and types of gas supply channels by employing computational fluid dynamics (CFD). A steel separator (AISI430) was superior to a ceramic plate (LaCrO3 ) in an aspect of thermal stress due to high thermal conductivity but inferior at average current density and fuel utilization rate. As initial temperature at the cell inlet was lowered from 950 °C to 650 °C per each pattern of gas flow (co-flow and counter-flow), useful data were acquired to analyze a performance drop. I-V curves at 650 °C and 900 °C, which involved various parameters as separator materials and directions of gas supply, compared performance characterization between low and high temperature SOFC and also implied the most effective combination.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometry of computational domain. (a) Unit cell whit single channel, (b) Unit cell whit multichannel, (c) Stack model.

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Figure 2

The temperature distribution at the anode side of interconnect along x-direction. (a) T = 923 K, (b) T = 1173 K.

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Figure 3

The mole fraction distribution along the x-direction distance (ceramic interconnect, co-flow, 933 K and 1173 K)

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Figure 4

Temperature and current density distribution at electrolyte (steel interconnect, counter-flow, 923 K)

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Figure 5

The temperature distribution at the anode side of interconnect along x-direction when fuel acquired by SR and ATR is used. (inlet temperature = 1173 K).

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Figure 6

I-V curve in the model of unit cell with a single channel. (a) I-V curve at 923 K, (b) I-V curve at 1173 K.

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Figure 7

The flow velocity along y-direction in air channel and fuel channel. (a) Air channel, (b) fuel channel.

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Figure 8

The temperature and current density distribution on the surface where the electrolyte and the cathode are in contact. (a)Temperature distribution, (b) Current density distribution

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Figure 9

Current density distribution on X-Z plane of the unit cell

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Figure 10

Flow velocity in the channel inlet of each unit cell. (a) Inlet of fuel channel for each unit cell, (b) Inlet of air channel for each unit cell.

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Figure 11

Flow velocity in inlet and outlet of each unit cell. (a) Fuel inlet and outlet for each unit cell, (b) Air inlet and outlet for each unit cell.

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