Procedure for shutting down a fuel cell system having an anode exhaust recycle loop
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United States of America Patent
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N/A
Issued Date -
Aug 1, 2002
app pub date -
Jan 25, 2001
filing date -
Jan 25, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A procedure for shutting down an operating fuel cell system that recirculates a portion of the anode exhaust in a recycle loop, includes disconnecting the primary load from the external circuit, stopping the flow of air to the cathode, and applying an auxiliary resistive load across the cells to reduce and/or limit cell voltage and reduce the cathode potential while fuel is still flowing to the anode and the anode exhaust is recirculating. The fuel flow is then stopped, but the anode exhaust continues to be circulated in the recycle loop to bring the hydrogen therein into contact with a catalyst in the presence of oxygen to convert the hydrogen to water, such as in a catalytic burner. The recirculating is continued until substantially all the hydrogen is removed. The cell may then be completely shut down. No inert gas purge is required as part of the shut-down process.
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