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Research Papers

Development of a Dynamic Cathode Ejector Model for Solid Oxide Fuel Cell-Gas Turbine Hybrid Systems

[+] Author and Article Information
James D. Maclay, G. Scott Samuelsen

Advanced Power and Energy Program,  University of California, Irvine, CA 92617

Jacob Brouwer1

Advanced Power and Energy Program,  University of California, Irvine, CA 92617jb@nfcrc.uci.edu

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(5), 051013 (Jun 20, 2011) (6 pages) doi:10.1115/1.4003774 History: Received December 29, 2010; Accepted February 02, 2011; Published June 20, 2011; Online June 20, 2011

Solid oxide fuel cell-gas turbine (SOFC-GT) hybrid systems are attractive for future power generation with ultra-low criteria pollutant and greenhouse gas emissions. One of the challenges for SOFC-GT systems is to sufficiently pre-heat incoming air before it enters the fuel cell cathode. An ejector for cathode exhaust recirculation has the benefits of reliability, low maintenance, and cost compared to either recuperators or cathode recirculation blowers, which may be also be used for air pre-heating. In this study, a dynamic Simulink model of an ejector for cathode exhaust recirculation to pre-heat incoming fuel cell air has been developed. The ejector is to be utilized within a 100 MW SOFC-GT dynamic model operating on coal syngas. A thorough theoretical development is presented. Results for the ejector were found to be in good agreement with those reported in literature.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Diagram of a pressurized 100 MW SOFC-GT hybrid power block utilizing an ejector for cathode recirculation

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Figure 2

Fuel cell cathode recirculation ejector

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Figure 3

Cathode ejector primary nozzle

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Figure 4

Area ratio versus Mach number for isentropic flow of an ideal gas with γ = 1.4 (Air)

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Figure 5

Schematic of plenum volume and dynamic solution approach

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Figure 9

Ejector exit temperature and entrainment ratio versus primary stream pressure

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Figure 8

Temperature versus ejector location for primary and secondary streams

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Figure 7

Pressure versus ejector location for primary and secondary streams

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Figure 6

Mach number versus ejector location for primary and secondary streams

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