Non-circulating coolant PEM fuel cell power plant with antifreeze back pressure air venting system
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United States of America Patent
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Jul 12, 2011
Grant Date -
Dec 31, 2009
app pub date -
May 24, 2008
filing date -
May 24, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A PEM fuel cell (4) power plant includes a passive air vent (24) through which air separated from a cathode effluent stream can be expelled from the power plant. The air vent operates satisfactorily during ambient freezing conditions thus it is eminently suitable for use in mobile applications such as in PEM fuel cell-powered automobiles, buses, or the like. The vent is formed from a liquid antifreeze layer (40) that is disposed in a sparging tank (36) which communicates with ambient surroundings. Any water vapor in the stream can condense out of the gas-stream in the antifreeze. In order to facilitate this result, the antifreeze can be a liquid that is immiscible with water so that the condensed water will form a separate layer (38) in the sparging tank.
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