Cascaded stack with gas flow recycle in the first stage

Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or...

Reexamination Certificate

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Details

C429S408000, C429S415000, C429S452000

Reexamination Certificate

active

08007943

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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