Controlled process gas pressure decay at shut down

Details Controlled process gas pressure decay at shut down Controlled process gas pressure decay at shut down

G - Physics

05

D

G05D 16/00 (2006.01) G01R 31/36 (2006.01) H01M 8/04 (2006.01)

Patent

CA 2549151

A back pressure regulating device can be incorporated into a fuel cell test station or a fuel cell power module. For each of fuel can oxidant lines, it provides a gas pressure regulator. The pressure regulator is controlled by a pilot gas, supplied through a pressure regulating valve and a three-way valve. Another port of the three-way valve provides a vent through a check valve and a needle valve. The needle valve is connected to both check valves for the pilot gas lines for the fuel and oxidant. In normal operation, the pilot gas pressure, regulated by the pressure regulating valve, is supplied to the appropriate pressure regulator to control the respective fuel and oxidant gas pressures. On shut down, the three-way valve connects the pressure regulator through the respective check valve to the needle valve. This provides controlled decay of the pressures of the fuel and oxidant gases.

L'invention concerne un dispositif de régulation de la contre-pression qui peut être intégré à un poste d'essai de piles à combustible ou à un module d'alimentation de piles à combustible. Chaque canalisation de combustible et d'oxydant possède un régulateur de pression du gaz. Le régulateur de pression est commandé par un gaz pilote fourni par une soupape régulatrice de pression et une soupape à trois voies. Un autre orifice de la soupape à trois voies forme un évent à travers le clapet anti-retour et un clapet à aiguille. Le clapet à aiguille est relié aux deux clapets anti-retour des canalisations de gaz pilote pour le combustible et l'oxydant. Lors du fonctionnement normal, la pression du gaz pilote, régulée par la soupape régulatrice de pression, est transmise au régulateur de pression approprié afin de commander les pressions respectives des gaz combustibles et oxydants. Lors de l'arrêt, la soupape à trois voies connecte le régulateur de pression au clapet à aiguille via le clapet anti-retour, ce qui permet de réguler la baisse de la pression des gaz combustibles et oxydants.

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