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Research Papers

Efficiency Evaluation of Solid-Oxide Fuel Cells in Combined Cycle Operations

[+] Author and Article Information
C. M. Colson1

Electrical and Computer Engineering Department, Montana State University, Bozeman, MT 59715christopher.colson@myportal.montana.edu

M. H. Nehrir

Electrical and Computer Engineering Department, Montana State University, Bozeman, MT 59715

M. C. Deibert

Chemical and Biological Engineering Department, Montana State University, Bozeman, MT 59717

M. R. Amin

Mechanical and Industrial Engineering Department, Montana State University, Bozeman, MT 59717

C. Wang

Engineering Technology Division, Wayne State University, Detroit, MI 48202

1

Corresponding author.

J. Fuel Cell Sci. Technol 6(2), 021006 (Feb 23, 2009) (7 pages) doi:10.1115/1.2971174 History: Received May 15, 2007; Revised February 27, 2008; Published February 23, 2009

Solid oxide fuel cells (SOFCs) are high-temperature, high-efficiency, combustionless electrochemical energy conversion devices that have potential for combined cycle applications. This paper intends to clarify and expand the efficiency discussions related to SOFC when operating in combined cycle (CC) systems. A brief analysis of the first and second thermodynamic laws is conducted and, building upon a previously developed SOFC dynamic model, operating fuel heating values are determined by utilizing the semi-empirical gas phase heat capacity method. As a result, accurate SOFC stack operational simulations are conducted to calculate its efficiency based on actual thermodynamic parameters. Furthermore, an analysis is conducted of a combined SOFC-CC system using dynamic modeling. Simulation results are given, which are intended to aid researchers in evaluating hybrid SOFC-CC generation systems.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Block diagram of SOFC dynamic model (9)

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Figure 7

Comparison of SOFC stand-alone system electrical efficiency and SOFC-CC system efficiency (both including inlet species preconditioning support)

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Figure 6

Simplified efficiency flow model for the SOFC-CC system

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Figure 5

Comparisons between dynamically modeled SOFC stack electrical efficiencies utilizing higher heating value, lower heating value, and the calculated enthalpy flow for actual SOFC operating parameters at 1273K

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Figure 4

Simulated SOFC stack electrical efficiency versus load current at different operating temperatures

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Figure 3

Simulated SOFC stack fuel utilization versus load current

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Figure 2

V‐I and P‐I curves of SOFC model reported in Ref. 9

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