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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

Abstract

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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Figures

Figure 10

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

Figure 11

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

Figure 13

Cost of CO2 compression for Brayton and recuperated systems

Figure 8

Cathode air recirculation rates with fuel utilization at 70%

Figure 7

System compressor air flows with fuel utilization at 70%

Figure 6

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

Figure 5

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

Figure 4

Temperature and mass flow signatures with fuel utilization=70%

Figure 3

Power cost to produce O2

Figure 2

Syngas processing stream

Figure 1

Gas turbine fuel cell hybrid system with carbon capture

Figure 12

Energy budget for the system components in the carbon capture loop

Figure 9

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

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