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Figure 6-7 Influence of Pressure on Voltage Gain (55) 6.2.2 EffectofTemperature The influence of temperature on the reversible potential of MCFCs depends on several factors, one of which involves the equilibrium composition of the fuel gas (22, 59, 60, 61).28 The water gas shift reaction achieves rapid equilibrium29 at the anode in MCFCs, and consequently CO serves as an indirect source of H2. The equilibrium constant (K) K= PCOPH2O (6-20) PH2 PCO2 increases with temperature (see Table 6-4 and Appendix 10.1), and the equilibrium composition changes with temperature and utilization to affect the cell voltage. The influence of temperature on the voltage of MCFCs is illustrated by the following example. Consider a cell with an oxidant gas mixture of 30 percent O2/60 percent CO2/10 percent N2, and a fuel gas mixture of 80 percent H2/20 percent CO2. When the fuel gas is saturated with H2O vapor at 25 °C, its composition becomes 77.5 percent H2/19.4 percent CO2/3.1 percent H2O. 28. For a fixed gas composition of H2, H2O, CO, CO2, and CH4 there is a temperature, Tb, below which the exothermic Boudouard reaction is thermodynamically favored, and a temperature, Tm, above which carbon formation by the endothermic decomposition of CH4 is thermodynamically favored; more extensive details on carbon deposition are found elsewhere (22, 59, 60, 61). 29. The dependence of equilibrium constant on temperature for carbon deposition, methanation, and water gas shift reactions is presented in Appendix 10.1. 6-19PDF Image | Fuel Cell Handbook (Seventh Edition)
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