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Fuel Cell Handbook (Seventh Edition)

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Fuel Cell Handbook (Seventh Edition) ( fuel-cell-handbook-seventh-edition )

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gas recirculation loop for the fuel cell has not been assumed, for water is not required for pre- reforming nor internal reforming. The combusted air and fuel stream (stream 13) from the high-pressure fuel cell is expanded (stream 14) in a turbine expander. The work of this turbine is used to drive the low- and high- pressure air compressors. The reduced pressure exhaust stream (stream 14) is utilized as the low-pressure fuel cell oxidant stream. Although vitiated, it still has 14 percent oxygen. The low-pressure SOFC operates at 0.69 volts per cell and fuel and air utilizations of 90 and 34.7 percent, respectively (23). The spent air and fuel effluents are combusted and sent (stream 15) to the low-pressure power turbine. The turbine generator produces approximately 134 MWe. The low-pressure exhaust (stream 16) has a temperature of 691 oC (1276 oF) and is utilized to preheat the high-pressure oxidant. The resulting cooled exhaust stream (stream 17) still has a temperature of 573 oC (1063 oF) and is utilized to supply heat to a steam bottoming cycle. Steam generated in the bottoming cycle is utilized in a reheat turbine to produce 118 MWe, as well as to supply the steam required by the air separation unit (ASU) and the gasifier coal slurry heater. The cycle exhaust exits the heat recovery steam generator at 126 oC (259 oF) and 0.98 atmospheres. Operating parameters are summarized in Table 8-23. Cycle performance is summarized in Table 8-24. The overall cycle net HHV efficiency is 59 percent. Table 8-22 Coal Analysis Coal Parameters Source Value Illinois No. 6 Ultimate Analysis, (wt percent, a.r.) Moisture Carbon Hydrogen Nitrogen Chlorine Sulfur Ash Oxygen (by difference) Total 11.12 63.75 4.50 1.25 0.29 2.51 9.70 6.88 100.00 HHV (Btu/lb) LHV (Btu/lb) 11,666 11,129 8-68

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