Combined cycle power plant

F - Mech Eng,Light,Heat,Weapons – 01 – K

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F01K 23/10 (2006.01) F02C 7/18 (2006.01)

Patent

CA 2284490

A combined cycle power plant which has a backup function at startup and even during operation, and surely maintains steam cooling in the event of occurrence of an accident. The combined cycle power plant serves to surely maintain steam cooling by conducting to a steam cooling system (400), which causes a high pressure portion being cooled, of a gas turbine to be cooled by steam, a high pressure steam or a medium pressure steam from an exhaust heat recovery boiler (200), when an exhaust steam, which is a cooling steam for the steam cooling system (400), from a high pressure turbine (301) suddenly decreases, to use the same as a cooling steam.

La présente invention concerne une centrale à cycle combiné dotée d'une fonction de secours au démarrage et en cours de fonctionnement, qui maintient de façon sûre un refroidissement par vapeur en cas d'accident. La centrale à cycle combiné de l'invention maintient de façon sûre un refroidissement par vapeur de la façon suivante: lorsqu'une vapeur d'échappement en provenance d'une turbine haute pression (301), qui constitue la vapeur de refroidissement d'un système de refroidissement par vapeur (400), diminue soudainement, elle amène dans le système de refroidissement par vapeur (400), qui permet de refroidir par la vapeur une partie à haute pression d'une turbine à gaz, une vapeur à haute ou à moyenne pression en provenance d'une chaudière de récupération de chaleur des gaz d'échappement (200) afin de l'utiliser comme vapeur de refroidissement.

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