FUEL CELL SYSTEM HAVING INLET FUEL TO MORE THAN ONE AND/OR RECYCLE TO LESS THAN ALL OF THE FUEL FIELDS

Title:

FUEL CELL SYSTEM HAVING INLET FUEL TO MORE THAN ONE AND/OR RECYCLE TO LESS THAN ALL OF THE FUEL FIELDS

Document Type and Number:

WIPO Patent Application WO2005072441

Kind Code:

A3

Abstract:

Fuel cell power plants (19, 47, 60, 86, 102, 112, 121) include recycle fuel from a fuel exit (29) of the last fuel flow field (23, 52, 64, 89) of a series of flow fields (20-23; 49-52; 61-64; 87-89) labeled M - N through M, applied either to the Mth flow fields or both the Mth and the (M-1)th flow fields. The fuel recycle impeller is a blower (30), a turbocompressor (30a) driven by an air exhaust, an ejector (30b) or an electrochemical hydrogen pump (30c). Fuel from a source (77) may be applied both to the first fuel flow field (87) and an additional fuel flow field (88, 74, 75, 89) of a series of flow fields to reduce pressure drop and flow rate requirements in the first of the series of flow fields and assure more fuel in the additional fuel flow field. Flow to the additional fuel flow field may be controlled by voltage (126) in such field or fuel content (128) of its exhaust. Transient fuel volume is provided by a tank (125).

Inventors:

MARGIOTT PAUL R (US)
PERRY MICHAEL L (US)
REISER CARL A (US)
VUKOVINSKY MICHAEL L (US)

Application Number:

PCT/US2005/003099

Publication Date:

September 29, 2005

Filing Date:

January 27, 2005

Export Citation:

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Assignee:

UTC FUEL CELLS LLC (US)
MARGIOTT PAUL R (US)
PERRY MICHAEL L (US)
REISER CARL A (US)
VUKOVINSKY MICHAEL L (US)

International Classes:

H01M8/04; H01M8/24; (IPC1-7): H01M8/04; H01M8/24

Foreign References:

US6572995B2	2003-06-03
US20040086771A1	2004-05-06
US6039773A	2000-03-21
JPH06188009A	1994-07-08
US6572992B2	2003-06-03
US6387558B1	2002-05-14

Other References: