Gas turbine apparatus

A gas turbine apparatus of the premixed fuel combustion type for driving a gas turbine, comprising:

• a combustion chamber for burning fuels to produce a high temperature gas for driving the gas turbine, the combustion chamber having a plurality of fuel-air pre-mixing chambers;
• a plurality of fuel supply systems for supplying fuels to the combustion chamber, each fuel supply system being connected to a respective one of the plurality of fuel-air pre-mixing chambers;
• means for mixing the fuels supplied from the plurality of fuel supply systems with high pressure air;
• means for detecting the temperature of the high temperature gas;
• means for determining the load of the gas turbine based on the detected temperature of the high temperature gas;
• a pressure sensor operatively connected to the combustion chamber for detecting vibration in the combustion chamber;
• means for sampling gas exhausted from the gas turbine;
• means for analyzing the content of nitrogen oxides (NO.sub.x) and carbon monoxide (CO) in the gas exhausted from the gas turbine, the analyzing means including means for determining the densities of the analyzed nitrogen oxides and carbon monoxide;
• and
• means for controlling the supply of fuels from the plurality of fuel supply systems in response to the determined gas turbine load, the detected vibration in the combustion chamber and the determined density of the nitrogen oxides and carbon monoxide of the gas turbine exhaust gas, comprising:
• a computer operatively connected to the load determining means, the pressure sensor and the analyzing means so as to receive, respectively, a determined gas turbine load value, a detected vibration value and a determined density value of the nitrogen oxides and carbon monoxide, the computer also being operatively connected to the plurality of fuel supply systems so that the supply of fuel from each fuel supply system is controlled by the computer to produce patterns of fuel supply and the computer controlling the fuel supply to each fuel supply system so that, at a plurality of transfer points, each corresponding to one of a plurality of gas turbine load values, the pattern of fuel supply is changed by increasing the supply of fuel from one fuel supply system in a stepwise manner and by equally reducing the supply of fuel from another fuel supply system in a stepwise manner whereby nitrogen oxide and carbon monoxide emissions in the gas turbine exhaust gas are reduced.