Abstract
Solid oxide fuel cells generally require a purge system to protect the cell anodes from damage during startup and shutdown. A novel liquid purge system has been proposed to reduce the complexity, cost and volume of existing purge systems. The proposed system incorporates the use of dilute organic compounds such as a water methanol solution. This is vaporised to produce a protective cover gas by flash evaporation. Thermodynamic calculations are supported by bench testing and finally implementation in a pre-production 5 kW SOFC. Good agreement between theory and testing has shown that dramatic improvements can be made in the target areas, and the system can be successfully incorporated into a commercial product.
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