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reduce carbon deposition. Measurements (22) on 10 cm x 10 cm cells at 650 °C using simulated gasified coal GF-1 (38 percent H2/56 percent CO/6 percent CO2) at 10 atm showed that only a small amount of CH4 is formed. At open circuit, 1.4 vol percent CH4 (dry gas basis) was detected, and at fuel utilizations of 50 to 85 percent, 1.2 to 0.5 percent CH4 was measured. The experiments with a high CO fuel gas (GF-1) at 10 atmospheres and humidified at 163 °C showed no indication of carbon deposition in a subscale MCFC. These studies indicated that CH4 formation and carbon deposition at the anodes in an MCFC operating on coal-derived fuels can be controlled, and under these conditions, the side reactions would have little influence on power plant efficiency. Figure 6-6 shows the effect of pressure (3, 5, and 10 atmospheres) and oxidant composition (3.2 percent CO2/23.2 percent O2/66.3 percent N2/7.3 percent H2O and 18.2 percent CO2/9.2 percent O2/65.3 percent N2/7.3 percent H2O) on the performance of 70.5 cm2 MCFCs at 650 °C (53). The major difference as the CO2 pressure changes is the change in open circuit potential, which increases with cell pressure and CO2 content (see Equation (6-11)). At 160 mA/cm2, ∆Vp is -44 mV for a pressure change from 3 to 10 atmospheres for both oxidant compositions. Because ∆Vp is a function of the total gas pressure, the gas compositions in Figure 6-6 have little influence on ∆Vp. Based on these results, the effect of cell voltage from a change in pressure can be expressed by the equation ∆Vp (mV) = 84 log P2 (6-18) P1 where P1 and P2 are different cell pressures. Another analysis by Benjamin, et al. (54) suggests that a coefficient less than 84 may be more applicable. The change in voltage as a function of pressure change was expressed as ∆Vp (mV) = 76.5 log P2 P1 (6-19) 6-17PDF Image | Fuel Cell Handbook (Seventh Edition)
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