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8.4 Fuel Cell System Designs The following five cycles are examples of current fuel cell offerings that reflect manufacturers' anticipated commercialization plans. These cycles are based on information available in relevant literature and may differ from the ultimate size of the commercial offering. 8.4.1 NaturalGasFueledPEFCSystem A natural gas PEFC power plant configuration is shown in Figure 8-26 and is a slight simplification of a cycle published in 1997 by a Ballard Researcher (13). In light of the PEFC sensitivity to CO, CO2 and methane, the fuel processing represents a significant portion of the cycle. Natural gas fuel enters a fuel compressor and a fuel cleanup device. (The reference document does not describe the cleanup device, but it is assumed to be a sulfur polisher to prevent poisoning of the fuel cell catalyst.) The cleaned gas is mixed with water in a vaporizer, which evaporates the liquid water into water vapor with waste heat from the reformer. This humidified fuel is reformed in the steam reformer. Because natural gas reformate is high in CO, the reformate is sent to a shift converter and selective oxidizer to reduce the CO to 10 to 50 ppm. This hydrogen rich/carbon monoxide lean fuel is fed to the PEFC stack where it reacts electrochemically with compressed air. Air Fuel Gas A C Re C Fuel Gas f Cleanup or Co o ol Fuel Gas Water me er Shift Convertor Selective Oxidizer r Spent Fuel CT Intercooler CT Water Separator Air Exhaust Vaporizer Figure 8-26 Natural Gas Fueled PEFC Power Plant Ambient air is compressed in a turbocharger, powered by the expansion of the hot pressurized exhaust gases. Following this first compression stage, the air is intercooled by a fin fan air cooler and fed into a second turbocharger. The high-pressure air is fed directly to the PEFC 8-52 Water TankPDF Image | Fuel Cell Handbook (Seventh Edition)
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