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Research Papers

Examination of the Effect of System Pressure Ratio and Heat Recuperation on the Efficiency of a Coal-Based Gas Turbine Fuel Cell Hybrid Power Generation System With CO2 Capture

[+] Author and Article Information
John VanOsdol

National Energy Technology Laboratory, United States Department of Energy, 3610 Collins Ferry Road, Morgantown, WV 26507-0880jvanosl@netl.doe.gov

Randall Gemmen

National Energy Technology Laboratory, United States Department of Energy, 3610 Collins Ferry Road, Morgantown, WV 26507-0880rgemmen@netl.doe.gov

Eric Liese

National Energy Technology Laboratory, United States Department of Energy, 3610 Collins Ferry Road, Morgantown, WV 26507-0880eliese@netl.doe.gov

J. Fuel Cell Sci. Technol 8(4), 041009 (Mar 31, 2011) (7 pages) doi:10.1115/1.4002793 History: Received July 27, 2010; Revised August 09, 2010; Published March 31, 2011; Online March 31, 2011

This paper examines two coal-based hybrid configurations that employ separated anode and cathode streams for the capture and compression of CO2. One configuration uses a standard Brayton cycle, and the other adds heat recuperation ahead of the fuel cell. Results show that peak efficiencies near 55% are possible, regardless of cycle configuration, including the cost in terms of energy production of CO2 capture and compression. The power that is required to capture and compress CO2 is shown to be approximately 15% of the total plant power.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Gas turbine fuel cell hybrid system with carbon capture

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Figure 2

Syngas processing stream

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Figure 3

Power cost to produce O2

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Figure 4

Temperature and mass flow signatures with fuel utilization=70%

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Figure 5

Power budget with fuel utilization=70% and system efficiency=53.6%

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Figure 6

Heat flow requirement as a function of pressure ratio with fuel utilization at 70%

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Figure 7

System compressor air flows with fuel utilization at 70%

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Figure 8

Cathode air recirculation rates with fuel utilization at 70%

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Figure 9

SOFC voltage as a function of pressure ratio with fuel utilization at 70%

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Figure 10

SOFC power as a function of pressure ratio with fuel utilization at 70%

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Figure 11

Effect of pressure ratio on system efficiency with fuel utilization at 70%

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Figure 12

Energy budget for the system components in the carbon capture loop

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Figure 13

Cost of CO2 compression for Brayton and recuperated systems

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