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

H - Electricity – 01 – M

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H01M 8/04 (2006.01)

Patent

CA 2424184

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.

Une défaillance d'un clapet (15,35,37,39) dans une conduite de drainage de l'eau (13,21,31,33) d'une pile à combustible peut avoir pour conséquence la circulation inopinée de gaz utile aux environs des cellules à combustible. Afin de pallier ce problème, l'invention a pour objet un procédé permettant de surveiller les fuites de substances d'une pile à combustible, ainsi qu'une installation à piles à combustible. D'après ledit procédé, le flux de gaz et d'eau à travers la conduite de drainage de l'eau (25,41) est surveillé (65), au moyen d'un tube de Venturi (23,40) relié à un capteur de pression différentielle (27,53). La valeur (67) et la variation dans le temps (69) de la pression différentielle indiquée par le capteur de pression différentielle (27,53) sont utilisées pour effectuer le réglage du clapet (15,35,37,39) dans la conduite de drainage de l'eau (13,21,31,33) et pour déconnecter (71) le bloc de piles à combustible (1) en cas de défaillance du clapet (15,35,37,39).

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