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TECHNICAL PAPERS

Load Leveling of Fuel Cell System by Oxygen Concentration Control of Cathode Gas

[+] Author and Article Information
Shin’ya Obara

 Tomakomai National College of Technology, 443 Nishikioka, Tomakomai 059-1275, Japanshinya@me.tomakomai-ct.ac.jp

J. Fuel Cell Sci. Technol 4(3), 238-247 (Jul 02, 2006) (10 pages) doi:10.1115/1.2743068 History: Received March 15, 2005; Revised July 02, 2006

The capacity reduction of a solid-polymer-membrane-type fuel cell (PEFC) with a reformer by load leveling and by improving the efficiency of part-load operation of the reformer is considered. The power generation efficiency of a fuel cell improves by supplying gas with a high oxygen concentration to the cathode. During periods of low electricity demand, the fuel cell is operated using reformed gas and air, and water electrolysis operation is also performed. When the electric power load is large, gases stored in cylinders are supplied to the fuel cell for operation. Using the proposed method, high efficiency operation and a reduction in the fuel cell capacity are possible.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Structure of a fuel cell cogeneration system with an electrolyzer

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Figure 2

Structure of a fuel cell cogeneration system with an electrolyzer

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Figure 3

Cell performance as a function of oxygen concentration of the cathode gas for an operating temperature 333k, and reactant flow stoichiometries 2 both hydrogen and oxygen

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Figure 4

Efficiency of the fuel cell electric power output as a function of oxygen concentration of the cathode gas for an operating temperature 333K, and pressure 0.1MPa

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Figure 5

The power output of the inverter as a function of the flow quantity and with varying oxygen concentration in the cathode gas. The area of the electrode including the anode and cathode of the fuel cell stack is 1m2, respectively, and the reformer efficiency is 0.73.

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Figure 6

The operational model of the fuel cell system with water electrolysis

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Figure 7

Models of electric power load

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Figure 8

Operational planning for system A

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Figure 9

Operational planning for system B

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Figure 10

Town gas consumption using system A

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Figure 11

Town gas consumption using system B

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Figure 12

Town gas consumption on representative days as a result of the introduction of systems A and B into an individual house

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Figure 13

Town gas consumption on representative days as a result of the introduction of systems A and B into a hospital, factory, hotel, and small store

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Figure 14

Efficiency of the system electric power output as a function of the ratio of power load of a fuel cell system with a reformer

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Figure 15

The operation time of blowers B1, B2, B3, and for systems A and B

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