FUEL CELL ANODE PURGE SYSTEMS AND METHODS
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United States of America Patent
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Issued Date -
Nov 29, 2007
app pub date -
May 11, 2007
filing date -
May 23, 2006
priority date (Note) -
Abandoned
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Abstract
Systems and methods of purging liquid from an anode flow field of a fuel cell having an anode region and a cathode region. A fuel cell is electrically coupled to an energy consuming device that applies a load to the fuel cell. A fuel stream is delivered to the anode region, and an oxidant stream to the cathode region, thereby causing an anode purge stream to be emitted from the anode region, and causing the fuel cell to generate an electrical output that satisfies at least a portion of the electrical load. The fuel cell is then electrically isolated from the applied load for a temporary period of time without substantially altering the flow rate of the fuel stream delivered to the anode region. The period of time is sufficient to cause the flow rate of the purge stream emitted from the anode region to increase in magnitude to expel from the anode region a substantial portion of any liquid that has collected in the anode flow field.
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