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Research Paper

Hybrid Fuel Cell Gas Turbine System Design and Optimization

[+] Author and Article Information
Dustin McLarty

e-mail: dfm@apep.uci.edu

Jack Brouwer

e-mail: jb@apep.uci.edu

Scott Samuelsen

e-mail: gss@apep.uci.edu
National Fuel Cell Research Center, Engineering Laboratory Facility,
Irvine, CA 92697-3550

Contributed by the Advanced Energy Systems Division of ASME for publication in the Journal of Fuel Cell Science and Technology. Manuscript received February 25, 2013; final manuscript received April 16, 2013; published online June 17, 2013. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 10(4), 041005 (Jun 17, 2013) (11 pages) Paper No: FC-13-1024; doi: 10.1115/1.4024569 History: Received February 25, 2013; Revised April 16, 2013

Ultrahigh efficiency, ultralow emission fuel cell gas turbine (FC/GT) hybrid technology represents a significant breakthrough in electric power generation. FC/GT hybrid designs are potentially fuel flexible, dynamically responsive, scalable, low-emission generators. The current work develops a library of dynamic component models and system design tools that are used to conceptualize and evaluate hybrid cycle configurations. The physical models developed for the design analysis are capable of off-design simulation, perturbation analysis, dispatch evaluation, and control development. A parametric variation of seven fundamental design parameters provides insights into design and development requirements of FC/GT hybrids. As the primary generator in most configurations, the FC design choices dominate the system performance, but the optimal design space may be substantially different from a stand-alone FC system. FC operating voltage, fuel utilization, and balance of plant component sizing has large impacts on cost, performance, and functionality. Analysis shows that hybridization of existing fuel cell and gas turbine technology can approach 75% fuel-to-electricity conversion efficiency.

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Figures

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Fig. 1

Hybrid design methodology

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Fig. 2

Empirical compressor and turbine maps

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Fig. 3

SOFC hybrid cycle diagram

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Fig. 4

Design impact of stack temperature profile

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Fig. 5

Design impact of stack power density

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Fig. 6

Design impact of stack fuel utilization

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Fig. 7

Design impact of air preheating

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Fig. 8

Design impact of system pressure

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Fig. 9

Design impact of turbine efficiency

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Fig. 10

Design impact of compressor efficiency

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Fig. 11

Design impact of average cell temperature

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Fig. 12

Voltage and efficiency as dependent variables

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Fig. 13

Recirculation and turbine % power as dependent variables

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Fig. 14

System efficiency and turbine % power as dependent variables

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