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cooler (FGCC) to remove the excess moisture levels. This raises the partial pressure of hydrogen in the fuel before entering the fuel cell. Some of the hydrogen-rich fuel is recycled back, as mentioned previously, to the incoming natural gas, while the majority of the fuel (stream 114) proceeds to the fuel cell anode. Approximately 86 percent of the hydrogen in the fuel stream reacts in the fuel cell, where the hydrogen donates an electron and the resulting proton migrates to the cathode, where it reacts with oxygen in the air to form water. Key cell operating parameters are summarized in Table 8-9. The overall performance is summarized in Table 8-10. The spent fuel is combusted in the reformer burner and supplies heat for the endothermic reforming reactions. Table 8-9 Operating/Design Parameters for the NG fueled PAFC Operating Parameters Volts per Cell (V) Current Density (mA/cm2) No of stacks Cell Operating Temp. (oC) Cell Outlet Pressure (atm) Overall Fuel Utilization (percent) Overall Oxidant Utilization (percent) DC to AC Inverter efficiency Auxiliary Load Value 0.76 320 12 207 8.0 86.2 70.0 97.0 percent 4.2 percent Table 8-10 Performance Summary for the NG fueled PAFC Performance Parameters LHV Thermal Input (MW) Auxiliary Power Net Power Electrical Efficiency (percent LHV) Electrical Efficiency (percent HHV) Heat Rate (Btu/kWh, LHV) Value 25.42 0.54 12.31 48.4 43.7 7,050 Gross Fuel Cell Power (MW) Fuel Cell DC Power Inverter Loss Fuel Cell AC Power 13.25 (0.40) 12.85 Note: The net HHV efficiency for the Goi Thermal Power Station is 41.8 percent (HHV) (1). 8-55PDF Image | Fuel Cell Handbook (Seventh Edition)
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