By Peter L. Auer and David Douglas (Eds.)
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Extra info for Advances in Energy Systems and Technology. Volume 5
The cathodic activation and ohmic polarization are probably the largest contributors. 2. 05 cm) and maintaining good pressure contacts. Total cell ohmic losses should be maintained below 40 mV at 100 mA/cm2. 3. The MCFC involves the reactions of the C0 2 at the cathode, C0 2 2 + è0 2 + le co2- and its release at the anode, CO , H2 30 Arnold P. Fickett C0 2 + H 2 0 + 2e. Thus in a practical MCFC system, C0 2 must be recycled from the anode exhaust to cathode inlet. The kinetics of the cathode are extremely complex and not completely understood but involve peroxides or Superoxides as well as carbonates.
A PAFC power plant integrated with a coal gasifier (instead of a steam reformer) is shown schematically in Fig. , 1982). This alternative combines small commercial (Wellman-Galusha) coal gasifier technology with the PAFC. Coal (lignite) is sized and then gravity fed to the 10-ft-diameter fixed bed gasifiers. Air is supplied by a blower, and steam is obtained from the fuel cell coolant system. The coal, air, and steam react in the gasifier to produce carbon monoxide and hydrogen in addition to methane and a variety of tars and oils, as well as sulfur- and nitrogen-bearing components.
Molten Carbonate Fuel Cell Systems The MCFC power plant based on a natural gas-petroleum-reforming process would, in principle, resemble Fig. 24 with one exception: the cathode of the molten carbonate fuel cell requires a source of carbon dioxide, since the half-cell reaction is C0 2 + \02 + 2e -> C0 3 . To accomplish this, the anode vent is combusted to convert all unused fuel to carbon dioxide and water; the water is condensed, and the carbon Gasifier Ψ Tar/oil Gas cleaning * t Air compression Gas compression - Ψ DEA process Sulfur Water^- Zinc oxide bed 1 Γ■^■Tail gas I Ü ΓΠ t Catalytic LJ P 1 combustor Stretford process Turbo expander Water treatment High and low temperature shifts Ψ Anode vent Cathode vent Steam t I 11-MW fuel cell Electricity 11 -MW ac nominal Inverter Fig.
Advances in Energy Systems and Technology. Volume 5 by Peter L. Auer and David Douglas (Eds.)