Avoiding coolant slump into reactant fields during PEM fuel...

Details Avoiding coolant slump into reactant fields during PEM fuel... Avoiding coolant slump into reactant fields during PEM fuel...

2006-08-31

2011-11-22

Lorengo, Jerry A (Department: 1731)

Chemistry: electrical current producing apparatus, product, and

Fuel cell, subcombination thereof, or method of making or...

Process or means for control of operation

Reexamination Certificate

active

08062801

ABSTRACT:
A fuel cell power plant (100) having a stack of fuel cells (102), each having an anode (104), a fuel reactant gas flow field plate (118), a cathode (106), an oxidant reactant gas flow field plate (120), and an electrolyte (101) between the anode and cathode. The stack has coolant channels (131), an air blower (144), air inlet (139a) and outlet (141a) valves, and a cathode recycle loop using either the primary air blower or a cathode recycle blower (135). A shutdown process includes recycling air through the cathodes with only one of an air inlet valve or air exit valve closed, while applying fresh fuel and recycling fuel through the anodes until oxygen is about 4% or less, or average cell voltage is about 0.2 or less, or for predetermined period of time.

REFERENCES:
patent: 6514635 (2003-02-01), Van Dine et al.
patent: 6635370 (2003-10-01), Condit et al.
patent: 6835479 (2004-12-01), Balliet et al.
patent: 6984464 (2006-01-01), Margiott et al.

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