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where PCO2 and PO2 are the average partial pressures of CO2 and O2 in the system. Figure 6-9 Influence of Reactant Gas Utilization on the Average Cell Voltage of an MCFC Stack (67, Figure 4-21, Pgs. 4-24) Fuel: The data in Table 6-5 from Lu and Selman (68) illustrate the dependence of the anode potential on the composition of five typical fuel gases and two chemical equilibria occurring in the anode compartment.32 The calculations show the gas compositions and open circuit anode potentials obtained after equilibria by the water gas shift and CH4 steam reforming reactions are considered. The open circuit anode potential calculated for the gas compositions after equilibration, and experimentally measured, is presented in Table 6-5. The equilibrium gas compositions obtained by the shift and steam reforming reactions clearly show that, in general, the H2 and CO2 contents in the dry gas decrease, and CH4 and CO are present in the equilibrated gases. The anode potential varies as a function of the [H2]/[H2O][CO2] ratio; a higher potential is obtained when this ratio is higher. The results show that the measured potentials agree with the values calculated, assuming that simultaneous equilibria of the shift and the steam reforming reactions reach equilibrium rapidly in the anode compartments of MCFCs. 32. No gas phase equilibrium exists between O2 and CO2 in the oxidant gas that could alter the composition or cathode potential. 6-23PDF Image | Fuel Cell Handbook (Seventh Edition)
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