Experiences With the First Japanese-Made Solid-Oxide Fuel-Cell System

[+] Author and Article Information
Yasunobu Mizutani1

Fundamental Research Department,  Toho Gas Co., Ltd., 507-2 Shinpo-machi, Tokai-city, Aichi Pref. 476-8501, Japanmaster@tohogas.co.jp

Koji Hisada, Kenji Ukai, Misuzu Yokoyama, Hirofumi Sumi

Fundamental Research Department,  Toho Gas Co., Ltd., 507-2 Shinpo-machi, Tokai-city, Aichi Pref. 476-8501, Japan


Corresponding author.

J. Fuel Cell Sci. Technol 2(3), 179-185 (Feb 23, 2005) (7 pages) doi:10.1115/1.1895986 History: Received December 15, 2004; Revised February 23, 2005

A solid-oxide fuel-cell (SOFC) system based on planar type cells and a cylindrical stack design was examined for small-scale stationary applications. To reduce the operating temperature of electrolyte-supported type cells, scandia-stabilized zirconia (ScSZ) was employed as the electrolyte. A compact catalytic partial oxidation (CPOx) reformer was employed and thin ferritic stainless steel was used for the interconnect bipolar plates. As a result, a carefully designed internal manifold-type 68 cell stack produced an output of 1kW at 1073K with thermal self-sustaining conditions. Also, important issues in realizing high-efficiency, cost-effective SOFC systems are discussed.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Bending strength and electrical conductivity of ScSZ at 1073K versus Sc2O3 doping concentrations

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Figure 2

Configuration of multiple cell stack design with center gas manifolds

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Figure 3

Photographs of 1kW stack with 68 ScSZ (Scandia-stabilized zirconia) cells

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Figure 4

Schematic flow diagram of simplified 1kW SOFC system

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Figure 5

Relationship between ohmic resistance of electrolyte at 1073K and dopant ratio in various electrolyte thicknesses

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Figure 6

I–V and I–P characteristics of single cells at 1073K with hydrogen/air. The thicknesses of electrolytes are 140μm for the old cell and 100μm for the new cell.

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Figure 7

Characteristics of high-temperature oxidation for several types of ferritic stainless-steel alloys

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Figure 8

Trends in short-term degradation in single cell test with ferritic stainless-steel interconnect plates

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Figure 9

I–V characteristics of single cell with different fuel flow rates

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Figure 10

Relationship between efficiency and fuel utilization with different fuel flow rates

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Figure 11

Chemical equilibrium compositions for partial oxidation of methane at 1073K

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Figure 12

Actual reformate gas compositions and stability in 1kW SOFC system with natural gas-based 13A fuel

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Figure 13

I–V characteristics of a 15-cell stack in an SOFC system with hydrogen fuel and CPOx (13A-Air) fuel

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Figure 14

Operating results of first 1kW stack with hydrogen fuel



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