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 25 kilowatt 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 percent, and temperature to within 5 percent. 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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ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology
May 23–25, 2005
Ypsilanti, Michigan, USA
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-3764-5
PROCEEDINGS PAPER
Dynamic Simulation of an Integrated Solid Oxide Fuel Cell System Including Current-Based Fuel Flow Control Available to Purchase
Fabian Mueller,
Fabian Mueller
University of California at Irvine, Irvine, CA
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Jacob Brouwer,
Jacob Brouwer
University of California at Irvine, Irvine, CA
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Faryar Jabbari,
Faryar Jabbari
University of California at Irvine, Irvine, CA
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Scott Samuelsen
Scott Samuelsen
University of California at Irvine, Irvine, CA
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Fabian Mueller
University of California at Irvine, Irvine, CA
Jacob Brouwer
University of California at Irvine, Irvine, CA
Faryar Jabbari
University of California at Irvine, Irvine, CA
Scott Samuelsen
University of California at Irvine, Irvine, CA
Paper No:
FUELCELL2005-74107, pp. 413-422; 10 pages
Published Online:
October 13, 2008
Citation
Mueller, F, Brouwer, J, Jabbari, F, & Samuelsen, S. "Dynamic Simulation of an Integrated Solid Oxide Fuel Cell System Including Current-Based Fuel Flow Control." Proceedings of the ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. 3rd International Conference on Fuel Cell Science, Engineering and Technology. Ypsilanti, Michigan, USA. May 23–25, 2005. pp. 413-422. ASME. https://doi.org/10.1115/FUELCELL2005-74107
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