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Research Papers

SOFC Lifetime Assessment in Gas Turbine Hybrid Power Systems

[+] Author and Article Information
David Tucker

U.S Department of Energy,
National Energy Technology Laboratory,
3610 Collins Ferry Road,
Morgantown, WV 26507-0880
e-mail: David.Tucker@NETL.DOE.GOV

Maria Abreu-Sepulveda

U.S Department of Energy,
National Energy Technology Laboratory,
3610 Collins Ferry Road,
Morgantown, WV 26507-0880
e-mail: maria0024@gmail.com

Nor Farida Harun

Department of Chemical Engineering,
McMaster University,
1280 Main Street West,
Hamilton, ON L8S 4L7, Canada

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received April 25, 2014; final manuscript received May 30, 2014; published online August 26, 2014. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 11(5), 051008 (Aug 26, 2014) (7 pages) Paper No: FC-14-1052; doi: 10.1115/1.4028158 History: Received April 25, 2014; Revised May 30, 2014

Abstract

The adoption of solid oxide fuel cell (SOFC) technology in power generation has been limited, in no small part, by material degradation issues affecting the stack lifetime, and hence, the economic viability. A numeric study was conducted to determine if the life of an SOFC could be extended when integrated with a recuperated gas turbine system. Dynamic modeling tools developed at the National Energy Technology Laboratory (NETL) for real-time applications were applied to evaluate life to failure for both a standalone SOFC and a hybrid SOFC gas turbine. These models were modified using empirical relations to experimental degradation data to incorporate degradation as a function of current density and fuel utilization. For the control strategy of shifting power to the turbine as fuel cell voltage degrades, the SOFC life could be extended dramatically, significantly impacting the economic potential of the technology.

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Figures

Fig. 1

A direct fired SOFC turbine hybrid with recuperation

Fig. 2

Degradation rates as a function of current density and fuel utilization at 800 °C

Fig. 3

Simplified flow diagram of fuel cell model with degradation

Fig. 4

Standalone fuel cell system configuration

Fig. 5

Typical power drop at fuel cell failure

Fig. 6

Hybrid fuel cell turbine system configuration

Fig. 7

Standalone degradation to failure, voltage, current, and power as a function time at 80% fuel utilization

Fig. 8

Standalone SOFC degradation to failure, efficiency, fuel flow, and fuel utilization as a function time

Fig. 9

A comparison of efficiency for an SOFC operated at 85% and 50% fuel utilization over the lifetime of the stack for a 310 kW power demand

Fig. 10

SOFC degradation in a hybrid configuration to failure, voltage, stack power, and turbine power as a function time at a 200 A SOFC load

Fig. 11

SOFC degradation to failure in a hybrid system, efficiency, fuel flow, and fuel utilization as a function time

Fig. 12

A comparison of cell voltage for an SOFC in a standalone configuration versus an SOFC in a hybrid configuration over the lifetime of the stack

Fig. 13

A comparison of fuel flow for an SOFC in a standalone configuration versus an SOFC in a hybrid configuration over 80,000 h

Fig. 14

A comparison of efficiency for an SOFC standalone system versus hybrid system over 80,000 h

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