Method and Apparatus for Controlling Gas Turbine Combustor

An apparatus for controlling a gas turbine combustor having a diffusion combustion burner and a premix combustion burner comprising:

• a fuel control unit for respectively controlling a fuel flow rate for the diffusion combustion burner to be fed to the diffusion combustion burner installed in the gas turbine combustor and a fuel flow rate for the premix combustion to be fed to the premix combustion burner so as to switch a combustion state of the gas turbine combustor from independent diffusion combustion by the diffusion combustion burner to mixed combustion of diffusion combustion and premix combustion by the diffusion combustion burner and the premix combustion burner on the basis of a signal transmitted from a timer circuit, which is installed to transmit a signal for controlling the fuel control unit after a predetermined period of time after receipt of a load dump signal of gas turbine, after a predetermined period of time.

A method for controlling a gas turbine combustor including a diffusion combustion burner and a premix combustion burner, comprising the steps of:

• detecting a rotating speed of gas turbine, recording the detected value of the rotating speed of gas turbine, calculating a change with time of the rotating speed of gas turbine in accordance with details of the recorded detected value of the rotating speed of gas turbine, judging a starting situation of reduction in the rotating speed of gas turbine on the basis of the calculated change with time of the rotating speed of gas turbine, and regulating a fuel flow rate fed to the gas turbine combustor controls respectively a fuel flow rate for the diffusion combustion burner to be fed to the diffusion combustion burner installed in the gas turbine combustor and a fuel flow rate for the premix combustion to be fed to the premix combustion burner.

A method for controlling a gas turbine combustor including a diffusion combustion burner and a premix combustion burner, comprising the steps of:

• detecting a rotating speed of a gas turbine, recording the detected value of the rotating speed of gas turbine, calculating a change with time of the rotating speed of gas turbine in accordance with details of the recorded detected value of the rotating speed of gas turbine, detecting an opening angle of a compressor bleed valve installed in a compressor, and regulating a fuel flow rate fed to the gas turbine combustor on the basis of check results of a calculated value of the change with time of the rotating speed of gas turbine and a detected opening angle signal of the bleed valve respectively controls a fuel flow rate for the diffusion combustion burner to be to the diffusion combustion burner installed in the gas turbine combustor and a fuel flow rate for the premix combustion to be fed to the premix combustion burner so as to switch a combustion state of the gas turbine combustor from independent diffusion combustion by the diffusion combustion burner to mixed combustion of the diffusion combustion and the premix combustion by the diffusion combustion burner and the premix combustion burner.

A method for controlling a gas turbine combustor having a diffusion combustion burner and a premix combustion burner, comprising the steps of:

• controlling a fuel flow rate for the diffusion combustion burner to be fed to the diffusion combustion burner installed in the gas turbine combustor and a fuel flow rate for the premix combustion to be fed to the premix combustion burner respectively so as to switch a combustion state of the gas turbine combustor from independent diffusion combustion by the diffusion combustion burner to mixed combustion of the diffusion combustion and the premix combustion by the diffusion combustion burner and the premix combustion burner on the basis of a signal transmitted from a timer circuit, which is installed to transmit a signal for controlling the fuel control unit after a predetermined period of time after receipt of a load dump signal of gas turbine, after a predetermined period of time.