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TECHNICAL PAPERS

Performance of Internal and External Reforming Molten Carbonate Fuel Cell Systems

[+] Author and Article Information
A. Musa1

Department of Flow, Heat and Combustion Mechanics, Ghent University—UGent, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgiummusa.abdullatif@ugent.be

H. J. Steeman, M. De Paepe

Department of Flow, Heat and Combustion Mechanics, Ghent University—UGent, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium

1

Corresponding author.

J. Fuel Cell Sci. Technol 4(1), 65-71 (Apr 19, 2006) (7 pages) doi:10.1115/1.2393306 History: Received November 28, 2005; Revised April 19, 2006

Molten carbonate fuel cells (MCFC) are a promising alternative power source for distributed or residential power plants. Therefore, thermodynamic models are built in an Aspen customer modeler for the externally reformed (ER) MCFC and internally reformed (IR) MCFC. These models are integrated in Aspen Plus™. In this article the performance of internal and external reforming molten carbonate fuel cell systems are investigated. To this end the gas temperature at the anode inlet is varied to be able to exam the effect of operating temperature on the operating conditions for different modes of MCFC systems in a range between 600 and 700°C. It is found that the operating temperature has more effect on the cell voltage of IR-MCFC system compared to ER-MCFC system. Simulations show that the IR-MCFC system is more efficient than the ER-MCFC system. The cycle efficiency is rather independent of the operating temperature for as well ER-MCFC as IR-MCFC systems.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic diagram of internal reformed MCFC system (COMP: compressor; H/E: heat exchanger; P: pump)

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Figure 2

Schematic diagram of external reformed MCFC system (COMP: compressor; H/E: heat exchanger; P: pump)

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Figure 3

Schematic of thermodynamic analysis of MCFC stack

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Figure 4

Fuel cell represented as an equivalent electrical circuit

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Figure 5

Effect of operating temperature on cell voltage at current density (150mA∕cm2)

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Figure 6

Mass flow rate of remaining CH4 as a function of operating temperature at current density (150mA∕cm2)

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Figure 7

Effect of operating temperature on efficiencies at current density (150mA∕cm2)

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Figure 8

Mass flow rate of fuel as a function of operating temperature at current density (150mA∕cm2)

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Figure 9

Effect of operating temperature on turbine and compressors power at current density (150mA∕cm2)

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Figure 10

The outlet temperature of the cycle and of heat exchanger H/E4 as a function of operating temperature at current density (150mA∕cm2)

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Figure 11

Effect of operating temperature on cell voltage at current density (107mA∕cm2)

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Figure 12

Effect of operating temperature on efficiencies at current density (107mA∕cm2)

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Figure 13

Mass flow rate of fuel as a function of operating temperature at current density (107mA∕cm2)

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Figure 14

Effect of operating temperature on total power at current density (107mA∕cm2)

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Figure 15

Effect of operating temperature on cell voltage at current density (64mA∕cm2)

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Figure 16

Effect of operating temperature on efficiencies at current density (64mA∕cm2)

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Figure 17

Mass flow rate of fuel as a function of operating temperature at current density (64mA∕cm2)

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