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8.4.6 CoalFueledSOFCSystem The coal fueled solid oxide fuel cell power system presented here is based on work performed for the Department of Energy’s program (22) to develop high efficiency, low emission, fuel flexible (including coal) processes. This cycle is a coal-fueled version of the Siemens Westinghouse TSOFC cycle presented in Section 8.4.4 consists of a Destec gasifier, cascaded SOFCs at two pressure levels, an integrated reheat gas turbine, and a reheat steam turbine bottoming cycle. The high-pressure portion of the cycle is designed to operate at 15 atmospheres to capitalize on a reasonable gas turbine expansion ratio and an advanced, but not unrealistic, fuel cell pressure. An operating pressure of 30 atmospheres would yield better fuel cell and gas turbine performance, but has been conservatively limited to 15 atmospheres; this is lower than the typical Destec design pressure. Higher pressure operation is feasible and would have better performance. The coal analysis is presented in Table 8-22. A flow diagram for the coal fueled 500 MW class cascaded TSOFC power cycle is presented in Figure 8-31. A brief process description is given below, followed by a performance summary. Selected state point values are presented in Table 8-23. Raw Fuel Gas 5 Air 10 Compressor Transport-Bed Desulfurization 19 4 Water Fuel-Gas 14 Turbine 11 6 13 Cathode Anode Zinc Oxide Polisher Expander 8 9 18 25 21 23 SOFC Cooler 7 Anode Cathode Coal/Water Slurry 1 2 ASU DESTEC Gasifier 3 Slag 20 Steam Exhaust IP Clean Fuel Gas Recuperator 12 SOFC Turbine 15 Power Turbine Generator 16 HRSG To Asu 24 To Gasifier 26 17 22 Reheat Steam Turbine Bottoming Cycle Figure 8-31 Schematic for a 500 MW Class Coal Fueled Pressurized SOFC 8-66PDF Image | Fuel Cell Handbook (Seventh Edition)
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