Patent ID: 7610746
Filing Date: 2009-11-03
Classification: F02C

Abstract:
1. A combustion control device for a gas turbine which is fitted to a gas turbine provided with a gas turbine body, a combustor having multiple types of fuel nozzles, a compressor, and multiple fuel flow rate control valves for respectively controlling fuel supplies to the multiple types of the fuel nozzles, and which is configured to control the fuel supplies to the multiple types of the fuel nozzles by controlling apertures of the fuel flow rate control valves, the combustion control device comprising: fuel flow rate command setting means for calculating fuel flow rate command values proportional to fuel flow rates to be supplied respectively to the multiple types of the fuel nozzles based on a total flow rate command value proportional to a total flow rate to be supplied to the multiple types of the fuel nozzles and on ratios of fuels to be supplied respectively to the multiple types of the fuel nozzles; fuel flow rate setting means for calculating the fuel flow rates to be supplied respectively to the multiple types of the fuel nozzles based on the fuel flow rate command values set up by the fuel flow rate command setting means and based on a function of the fuel flow rate command values and the fuel flow rates; Cv value setting means for calculating Cv values of the fuel flow rate control valves in accordance with a Cv value formula based on the fuel flow rates set up by the fuel flow rate setting means, a fuel temperature, and front pressures and back pressures of the fuel flow rate control valves; and fuel flow rate control valve position command setting means for calculating fuel flow rate control valve position command values based on the Cv values set up by the Cv value setting means and based on a function of the Cv values and fuel flow rate control valve positions, wherein the fuel supplies to the multiple types of the fuel nozzles are controlled by controlling apertures of the fuel flow rate control valves based on the fuel flow rate control valve position command values set up by the fuel flow rate control valve position command setting means.