Fuel cell minimum fuel recycle with maximum fuel utilization

Details Fuel cell minimum fuel recycle with maximum fuel utilization Fuel cell minimum fuel recycle with maximum fuel utilization

2004-05-04

2010-06-08

Ryan, Patrick (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

C429S010000, C429S006000

Reexamination Certificate

active

07732073

ABSTRACT:
Recycle fuel gas is provided (36) to an impeller (34, 34a) for application to the input (24) of the anode flow fields of a fuel cell stack (25). The impeller may be an ejector (34) having its primary input (33) connected to a source (11) of hydrogen and its secondary input (35) connected to the outlet (27, 37) of the fuel cells anode flow fields. The ejector outlet provides the minimum fuel flow required at the lowest power rating. The impeller may be an electrochemical hydrogen pump (34a) with a constant current generator (50) providing for a substantially constant recycle flow (the highest not more than double the lowest), and one pressure regulator (20) providing minimum flow of fresh fuel to the fuel inlets of the first stack. Pressure regulators (20, 21) control the amount of fresh fuel to the anode flow fields for power in excess of minimum power.

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U.S. Appl. No. 10/765,735, filed Jan. 27, 2004.
U.S. Appl. No. 10/802,017, filed Mar. 16, 2004.

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