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1300.0 1100.0 900.0 700.0 500.0 300.0 100.0 -100.0 0123456 Q, Heat Transferred to Steam from Hot Gas, kcal water/steam in HRSG Figure 8-35 T-Q Plot for Heat Recovery Steam Generator (Brayton-Rankine) Rankine Cycle: The fuel cell Rankine cycle arrangement in Figure 8-36 employs a heat recovery steam generator operating on the exhaust combustion product stream from the fuel cell and combustor at atmospheric pressure. This exhaust stream first provides the heat required to preheat and reform the CH4 fuel, providing CO and H2 at temperature to the fuel cell. Partially combusted fuel from the cell is recycled to provide the H2O required for reforming the fuel. Depleted air from the cell exhaust is recycled to the air feed stream to raise its temperature to the desired value at the cell inlet. The operating conditions and the T - S diagram for the Rankine cycle are identical to those illustrated for the combined Brayton-Rankine cycle in Figure 8-34 and Table 8-26. The results of the performance calculations for the fuel cell, Rankine cycle heat recovery system, summarized in Table 8-26, indicate that the efficiency of the overall system is increased from 57 percent for the fuel cell alone to 72 percent for the overall system. This Rankine cycle heat-fuel recovery arrangement is less complex but less efficient than the combined Brayton-Rankine cycle approach, and more complex and less efficient than the regenerative Brayton approach. It does, however, eliminate the requirement for a large, high temperature gas to gas heat exchanger. And in applications where cogeneration and the supply of heat are desired, it provides a source of steam. The T - Q plot for the heat transfer processes involved in this fuel cell Rankine cycle arrangement is shown in Figure 8-37. Because heat is removed from the exhaust gases to heat and reform the CH4 fuel feed, the temperature of the hot gas entering the heat recovery steam generator in this 8-76 T, Temperature of Streams, FPDF Image | Fuel Cell Handbook (Seventh Edition)
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