Fuel ratio control method and device in a gas turbine combustor

F - Mech Eng,Light,Heat,Weapons – 02 – C

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F02C 9/28 (2006.01) F01D 17/02 (2006.01) F02C 7/228 (2006.01) F23N 5/18 (2006.01) F23R 3/28 (2006.01)

Patent

CA 2405472

A fuel ratio control method and a device therefor in a gas turbine combustor are provided in which supply ratio of pilot fuel to main fuel is appropriately maintained to thereby avoid unstable combustion, such as combustion vibration or misfire, and to realize a low NOx combustion. Fuel ratio control signal CSO is set corresponding to generator output L GEN put out by a generator output input unit 1. Pilot fuel ratio control is performed by correcting the fuel ratio control signal CSO corresponding to condition change in both or either one of combustion air and fuel. The condition change in the combustion air is at least one of changes in compressor on-line vane washing, ambient humidity, ambient pressure, etc. and the condition change in the fuel is a change in fuel component. The signal correction is also made by gas turbine deterioration factor or change rate in the generator output.

L'invention concerne une méthode et un dispositif de réglage de l'alimentation de la chambre de combustion d'une turbine à gaz, dont le rapport d'alimentation du carburant pilote au carburant principal est maintenu de manière appropriée pour éviter une combustion instable, telle qu'une vibration de combustion ou un raté d'allumage, et pour réaliser une combustion à faible teneur en NOx. Un signal de contrôle du rapport carburant (CSO) est établi en fonction de la sortie de générateur (L GEN) en provenance d'une unité d'entrée-sortie de générateur (1). Le contrôle du rapport du carburant pilote est assuré en corrigeant le signal de contrôle du rapport carburant (CSO) correspondant à un changement de condition dans l'air de combustion et le carburant ou l'un des deux. Le changement de condition de l'air de combustion concerne au moins un des changements sur le plan du lavage de l'aube directrice d'entrée, de l'humidité ambiante, de la pression ambiante, etc. et le changement de condition du carburant concerne le composant du carburant. La correction du signal est également assurée par le facteur de détérioration de la turbine à gaz ou le taux de changement du débit du générateur.

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