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By Peter L. Auer and David Douglas (Eds.)

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ELECTRIC UTILITY FUEL CELL SYSTEMS A. Electric Utility Fuel Cell Power Plant Characteristics An electric utility fuel cell power plant will include the three principal subsystems described in Fig. 2: the power section, the fuel processor, and the power conditioner. The power section receives a hydrogen-rich gas stream from the fuel processor and delivers power at 2000 to 3000 V dc to the power conditioner. The fuel processor converts a logistic (available) utility fuel such as natural gas, naphtha, or coal gas to the hydrogen-rich gas received by the power section.

21. Typical daily electric load variations. Fuel Cells for Electric Utility Power Generation 43 increasing demand in the early morning and with significant variations during the rest of the day and early evening. Depending on the utility's location and the season, there may be one or two peaks during the day. This curve can be separated into three areas: the "baseload" power level required at least 70% of the time, the incremental power level (called "intermediate duty") above the baseload required 15-70% of the time, and the additional power level required to meet the peaks that will occur 0-15% of the time.

An anode current collector that conducts the electrons from the anode to the separator plate and provides passage for fuel flow: In some MCFC configurations, this function is provided by ribbing or folding the separator plate. In other configurations, the current collector ribs are formed into the porous electrodes, as discussed under PAFCs. The current collector must have good electronic 28 Arnold P. Fickett 3. 4. 5. 6. conductivity and be stable to the fuel environment. Nickel is a satisfactory material, although copper is a possibility if it can be treated to reduce sintering.

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