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Ambient air (stream 200) is compressed in a two-stage compressor with intercooling to conditions of approximately 193 oC (380 oF) and 8.33 atmospheres (122.4 psia). The majority of the compressed air (stream 203) is utilized in the fuel cell cathode; however, a small amount of air is split off (stream 210) for use in the reformer burner. The spent oxidant (stream 205) enters a recuperative heat exchange before entering a cathode exhaust contact cooler, which removes moisture to be reused in the cycle. The dehumidified stream (stream 207) is again heated, mixed with the small reformer air stream, and sent to the reformer burner (stream 211). The reformer burner exhaust (stream 300) preheats the incoming oxidant and is sent to the auxiliary burner, where a small amount of natural gas (stream 118) is introduced. The amount of natural gas required in the auxiliary burner is set so the turbine shaft work balances the work required at the compressor shaft. The cycle exhaust (stream 304) is at approximately 177 oC (350 oF). Some of the saturated steam generated by the fuel cell cooling water is utilized to meet the reformer water requirements. Approximately 3,800 kg/hr (8,400 lb/hr) of 12.2 atmospheres (180 psi) saturated steam is available for other uses. Cycle performance is summarized in Table 8-10. The overall net electric conversion efficiency is 43.7 percent based on HHV input, or 48.4 percent on LHV. 8.4.3 NaturalGasFueledInternallyReformedMCFCSystem Fuel Cell Energy is developing initial market entry MCFC power systems, with mature megawatt class units projected to be available in 2004. These units will be produced in various sizes. Preliminary cycle information was received from FCE for a nominal 3 MW power plant. This cycle is presented in Figure 8-28 and is described below. Exhaust Gases Cleaned Fuel Steam Air 59oF 708 lbmol/hr C Natural Gas 59oF 47 lbmol/hr Water 59oF 74 lbmol/hr Exhaust or Waste Heat Boiler 700oF 831 lbmol/hr Fuel Cleanup Steam Generator NG/Steam Spent Fuel CO2, H2O, H2 Cathode Feed CO2, Air Figure 8-28 Natural Gas Fueled MCFC Power System 8-56 A C Anode Exhaust ConverterPDF Image | Fuel Cell Handbook (Seventh Edition)
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