A dynamic model of a 100 MW solid oxide fuel cell-gas turbine hybrid system has been developed and subjected to perturbations in diurnal ambient temperature and pressure as well as load sheds. The dynamic system responses monitored were the fuel cell electrolyte temperature, gas turbine shaft speed, turbine inlet temperature, and compressor surge. Using a control strategy that primarily focuses on holding fuel cell electrolyte temperature constant and secondarily on maintaining gas turbine shaft speed, safe operation was found to occur for expected ambient pressure variation ranges and for ambient temperature variations up to 28 K when tested nonsimultaneously. When ambient temperature and pressure were varied simultaneously, stable operation was found to occur when the two are in phase but not when the two are out of phase. The latter case leads to shaft overspeed. Compressor surge was found to be more likely when the system is subjected to a load shed initiated at minimum ambient temperature rather than at maximum ambient temperature. Fuel cell electrolyte temperature was found to be well-controlled except in the case of shaft overspeeds. Turbine inlet temperature remained in safe bounds for all cases.
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June 2011
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Diurnal Temperature and Pressure Effects on Axial Turbomachinery Stability in Solid Oxide Fuel Cell-Gas Turbine Hybrid Systems
James D. Maclay,
James D. Maclay
Advanced Power and Energy Program,
University of California, Irvine
, Irvine, CA 92697
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Jacob Brouwer,
Jacob Brouwer
Advanced Power and Energy Program,
e-mail: jb@nfcrc.uci.edu
University of California, Irvine
, Irvine, CA 92697
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G. Scott Samuelsen
G. Scott Samuelsen
Advanced Power and Energy Program,
University of California, Irvine
, Irvine, CA 92697
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James D. Maclay
Advanced Power and Energy Program,
University of California, Irvine
, Irvine, CA 92697
Jacob Brouwer
Advanced Power and Energy Program,
University of California, Irvine
, Irvine, CA 92697e-mail: jb@nfcrc.uci.edu
G. Scott Samuelsen
Advanced Power and Energy Program,
University of California, Irvine
, Irvine, CA 92697J. Fuel Cell Sci. Technol. Jun 2011, 8(3): 031012 (6 pages)
Published Online: March 1, 2011
Article history
Received:
September 27, 2010
Revised:
November 9, 2010
Online:
March 1, 2011
Published:
March 1, 2011
Citation
Maclay, J. D., Brouwer, J., and Samuelsen, G. S. (March 1, 2011). "Diurnal Temperature and Pressure Effects on Axial Turbomachinery Stability in Solid Oxide Fuel Cell-Gas Turbine Hybrid Systems." ASME. J. Fuel Cell Sci. Technol. June 2011; 8(3): 031012. https://doi.org/10.1115/1.4003163
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