Cascaded fuel cell stacks for fast start-up and anode coking...

Details Cascaded fuel cell stacks for fast start-up and anode coking... Cascaded fuel cell stacks for fast start-up and anode coking...

2003-08-14

2008-12-30

Rhee, Jane (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

C429S006000, C429S006000, C429S047000

Reexamination Certificate

active

07470477

ABSTRACT:
A solid-oxide fuel cell system having a relatively large primary fuel cell sub-assembly for steady-state operation and a relatively small secondary fuel cell sub-assembly which is rapidly heatable to a threshold operating temperature to a) produce usable power in a short time period, b) cascade a hot exhaust into the primary fuel cell sub-assembly to assist in preheating thereof, and c) provide steam into the primary fuel cell sub-assembly to prevent coking of the anodes thereof. As the primary sub-assembly reaches its threshold temperature, it too begins to generate electricity and continues to self-heat and to be heated by the secondary sub-assembly. Preferably, the secondary sub-assembly continues to provide electricity in complement with the primary sub-assembly until the primary sub-assembly reaches full power, at which time the secondary sub-assembly may be shut down or switched to standby status for fuel efficiency, as desired.

REFERENCES:
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patent: 6294278 (2001-09-01), Wohr et al.
patent: 6794068 (2004-09-01), Rapaport et al.
patent: 2002/0187357 (2002-12-01), Nakamura et al.
patent: 2004/0048123 (2004-03-01), Kelly et al.
patent: 2004/171881 (2004-06-01), None
European Search Report dated Mar. 22, 2007.

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