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8.4.4 NaturalGasFueledPressurizedSOFCSystem This natural gas fuel cell power system is based on a pressurized TSOFC combined with a combustion turbine developed by Siemens Westinghouse48 (17). Most TSOFC power plant concepts developed to date have been based on atmospheric operation. However, as shown in Section 7, the cell voltage increases with cell pressure. Thus, operating with an elevated pressure will yield increased power and efficiency for a given cycle. In addition, the use of a pressurized SOFC will also allow integration with a combustion turbine. The combustion turbine selected for integration by Siemens Westinghouse is the unique 1.4 MW Heron reheat combustion turbine, a proposed product of Heron (18). A flow diagram for the natural gas fueled 4.5 MW class cascaded49 TSOFC power cycle is presented in Figure 8-29. A brief process description is given below, followed by a performance summary. Selected state point values are presented in Table 8-13. Air 7 Filter Compressor 8 Compressor / Turbine Compressor Turbine 12 13 Fuel 4 Exhaust Fuel Precooler 1 2 Fuel Exhaust 16 9 14 Turbine 10 11 6 SOFC System Desulfurizers 5 Exhaust Figure 8-29 Schematic for a 4.5 MW Pressurized SOFC Air Recuperator / Fuel Heater 3 15 SOFC System Turbine Fuel Generator Power 48. The referenced Siemens Westinghouse publication presented the cycle concept and overall performance values. Neither specific stream information nor assumptions were presented. The stream data and assumptions presented here were developed by Parsons. The stream data were developed using an ASPEN simulation which yielded performance numbers in general agreement with the publication. 49. The term "cascaded" fuel cells is used here to describe a fuel cell system where the exhaust of a high-pressure fuel cell is utilized as an oxidant feed stream in a low-pressure fuel cell after passing through an expander. 8-58PDF Image | Fuel Cell Handbook (Seventh Edition)
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