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Figure 8-33 Combined Brayton-Rankine Cycle Fuel Cell Power Generation System The air/fuel ratio entering the fuel cell and the fraction of the CH4 fuel consumed in the cell are selected to achieve the desired fuel cell operating temperature range and gas turbine NIT and PR. These are selected to correspond with those of a conventional, large-scale, utility gas turbine. Further insight can be gained from an idealized T- S diagram for the cycle, Figure 8-34, in which both the Brayton and the Rankine cycles are illustrated. Both the pressure and the temperature increase during fuel and air compression in this combined cycle will be significantly greater than in the regenerative Brayton cycle described above. The heating of the air and fuel, the operation of the fuel cell, and the burning of the residual fuel are assumed to occur at constant pressure. The expansion of the combustion product gases in the gas turbine again is represented as an adiabatic, reversible (constant S) process. Next, heat is removed from these gases at nearly constant pressure in the heat recovery steam generator; and they pass out through the stack. 8-74PDF Image | Fuel Cell Handbook (Seventh Edition)
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