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

Claim 0:
1. A combustion control device for a gas turbine for supplying, to a combustor, compressed air by a compressor flowing into a casing, the device comprising:
a memory configured to store a program; and
a hardware processor configured to execute the program and control the combustion control device to:
control 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;
control a fuel regulating valve for regulating a fuel flow rate of fuel supplied to the combustor; and
acquire 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 hardware processor is configured to execute the program and control the combustion control device to control a valve opening degree of the bleed valve from a closed state to an open state with a prescribed opening degree, and control 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,
wherein the hardware processor is configured to execute the program and further control the combustion control device for deciding the prescribed opening degree, and
wherein the deciding of the prescribed opening degree includes:
to acquire the number of fuel nozzles in the main fuel system used after the reception of the load rejection signal; and
to decide the prescribed opening degree of the bleed valve based on the number of used fuel nozzles.