A two-dimensional dynamic model was created for a Siemens Westinghouse type tubular solid oxide fuel cell (SOFC). This SOFC model was integrated with simulation modules for other system components (e.g., reformer, combustion chamber, and dissipater) to comprise a system model that can simulate an integrated SOFC system located at the University of California, Irvine. A comparison of steady-state model results to data suggests that the integrated model can well predict actual system power performance to within 3%, and temperature to within 5%. In addition, the model predictions well characterize observed voltage and temperature transients that are representative of tubular SOFC system performance. The characteristic voltage transient due to changes in SOFC hydrogen concentration has a time scale that is shown to be on the order of seconds while the characteristic temperature transient is on the order of hours. Voltage transients due to hydrogen concentration change are investigated in detail. Particularly, the results reinforce the importance of maintaining fuel utilization during transient operation. The model is shown to be a useful tool for investigating the impacts of component response characteristics on overall system dynamic performance. Current-based flow control (CBFC), a control strategy of changing the fuel flow rate in proportion to the fuel cell current is tested and shown to be highly effective. The results further demonstrate the impact of fuel flow delay that may result from slow dynamic responses of control valves, and that such flow delays impose major limitations on the system transient response capability.
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e-mail: fm@nfcrc.uci.edu
e-mail: jb@nfcrc.uci.edu
e-mail: fjabbari@uci.edu
e-mail: gss@uci.edu
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May 2006
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Dynamic Simulation of an Integrated Solid Oxide Fuel Cell System Including Current-Based Fuel Flow Control
Fabian Mueller,
Fabian Mueller
Mechanical and Aerospace Engineering Department, National Fuel Cell Research Center,
e-mail: fm@nfcrc.uci.edu
University of California
, Irvine, CA 92697
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Jacob Brouwer,
Jacob Brouwer
Mechanical and Aerospace Engineering Department, National Fuel Cell Research Center,
e-mail: jb@nfcrc.uci.edu
University of California
, Irvine, CA 92697
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Faryar Jabbari,
Faryar Jabbari
Mechanical and Aerospace Engineering Department, National Fuel Cell Research Center,
e-mail: fjabbari@uci.edu
University of California
, Irvine, CA 92697
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Scott Samuelsen
Scott Samuelsen
Mechanical and Aerospace Engineering Department, National Fuel Cell Research Center,
e-mail: gss@uci.edu
University of California
, Irvine, CA 92697
Search for other works by this author on:
Fabian Mueller
Mechanical and Aerospace Engineering Department, National Fuel Cell Research Center,
University of California
, Irvine, CA 92697e-mail: fm@nfcrc.uci.edu
Jacob Brouwer
Mechanical and Aerospace Engineering Department, National Fuel Cell Research Center,
University of California
, Irvine, CA 92697e-mail: jb@nfcrc.uci.edu
Faryar Jabbari
Mechanical and Aerospace Engineering Department, National Fuel Cell Research Center,
University of California
, Irvine, CA 92697e-mail: fjabbari@uci.edu
Scott Samuelsen
Mechanical and Aerospace Engineering Department, National Fuel Cell Research Center,
University of California
, Irvine, CA 92697e-mail: gss@uci.edu
J. Fuel Cell Sci. Technol. May 2006, 3(2): 144-154 (11 pages)
Published Online: October 11, 2005
Article history
Received:
July 19, 2005
Revised:
October 11, 2005
Citation
Mueller, F., Brouwer, J., Jabbari, F., and Samuelsen, S. (October 11, 2005). "Dynamic Simulation of an Integrated Solid Oxide Fuel Cell System Including Current-Based Fuel Flow Control." ASME. J. Fuel Cell Sci. Technol. May 2006; 3(2): 144–154. https://doi.org/10.1115/1.2174063
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