Cascaded stack with gas flow recycle in the first stage
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United States of America Patent
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Aug 30, 2011
Grant Date -
May 3, 2007
app pub date -
Nov 3, 2005
filing date -
Nov 3, 2005
priority date (Note) -
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Abstract
A fuel cell system including a humidification system is described. The humidification system employs a recycling system that recycles relatively humid gas exhausted from a multistage fuel cell stack, either on the anode and/or cathode side, and sends this relatively humid gas back to be combined with relatively dry supply gas, such as but not limited to hydrogen and/or air. The humidified supply gas mixture is then reintroduced into the first stage of the multistage fuel cell stack. A recirculation device, such as but not limited to a pump and/or an ejector, can be used to aid in moving the humid exhaust gas back through a recycle gas line to be combined with the supply gas.
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