Patent ID: 11920523
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 6:
7. A combustion control method for a gas turbine for supplying, to a combustor, compressed air by a compressor flowing into a casing, the method comprising:
a bleed valve control step of controlling a bleed valve disposed on a bleed pipe for performing bleeding so that a part of the compressed air flowing into the casing is not used as combustion air in the combustor;
a fuel control step of controlling a fuel regulating valve for regulating a fuel flow rate of fuel supplied to the combustor; and
a temperature acquisition step of acquiring a flame temperature of flame caused by combustion of the fuel in the combustor,
wherein, upon reception of a load rejection signal for cutting off a load from the gas turbine, the bleed valve control step includes controlling a valve opening degree of the bleed valve from a closed state to an open state with a prescribed opening degree, and the fuel control step includes controlling the fuel regulating valve such that the acquired flame temperature falls within a predetermined temperature range defined by an upper limit value and a lower limit value,
wherein the combustor is connected to a plurality of fuel systems including a main fuel system for supplying premixed fuel of the fuel and the combustion air at a flow rate according to a load of the gas turbine to the combustor by using a plurality of fuel nozzles, and
wherein the method further comprises a step of deciding the prescribed opening degree including:
a step of acquiring the number of fuel nozzles in the main fuel system used after the reception of the load rejection signal; and
a step of deciding the prescribed opening degree of the bleed valve based on the number of used fuel nozzles.