Method for monitoring the discharge of media out of fuel...

Details Method for monitoring the discharge of media out of fuel... Method for monitoring the discharge of media out of fuel...

2001-09-10

2008-08-19

Ryan, Patrick (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S010000, C429S006000

Reexamination Certificate

active

07413823

ABSTRACT:
A defective operation of a valve (15, 35, 37, 39) in a drainage line (13, 21, 31, 33) of a fuel cell results in unintentionally permitting process gas to flow into the surrounding area of the fuel cells. In order to resolve this problem, the invention provides a method for monitoring the discharge of media out of a fuel cell and provides a fuel cell system, with which the gas and water stream flowing through the drainage line (25, 41) is monitored (65) by means of a Venturi nozzle (23, 40) that is connected to a differential pressure sensor (27, 53). The magnitude (67) and the temporal progression (69) of the differential pressure indicated by the differential pressure sensor (27, 53) establishes the basis for controlling the valve (15, 35, 37, 39) in the drainage line (13, 21, 31, 33) and for shutting down (71) the fuel cell block (1) in the event that the valve (15, 35, 37, 39) is defective.

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Patent Abstract of Japan; JP 07230817; Aug. 29, 1995; “Solid High Polymer Electrolyte Fuel Cell”; © 19985 JPO.

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