초록 ▼

A gas turbine combustion system includes a cylindrical combustor, a plurality of combustion sections in an arrangement spaced apart in an axial direction of the combustor, a plurality of fuel supply lines independently connected to the combustion sections, respectively, premixed fuel supply sections

A gas turbine combustion system includes a cylindrical combustor, a plurality of combustion sections in an arrangement spaced apart in an axial direction of the combustor, a plurality of fuel supply lines independently connected to the combustion sections, respectively, premixed fuel supply sections respectively provided for the fuel supply lines for supplying a premixed fuel, a diffusion combustion fuel supply section for supplying a diffusion combustion fuel to the combustion sections, and a control switching over the fuel supply sections to selectively supply either one of the premixed fuel and the diffusion combustion fuel. The premixed fuel at a first combustion stage is burned while the premixed fuel of subsequent stage is ignited by a high-temperature gas generated from combustion of the premixed fuel of a preceding combustion stage.

대표청구항 ▼

1. A combustion control method for a gas turbine combustion system which comprises a cylindrical combustor having one end closed by a header, a plurality of combustion stages in an arrangement spaced apart in an axial direction of the combustor, a plurality of fuel supply lines independently connect

1. A combustion control method for a gas turbine combustion system which comprises a cylindrical combustor having one end closed by a header, a plurality of combustion stages in an arrangement spaced apart in an axial direction of the combustor, a plurality of fuel supply lines independently connected to said combustion sections, respectively, a plurality of premixed fuel, a diffusion combustion fuel supply section supplying a diffusion combustion fuel to one of the combustion sections and a control unit for switching over said fuel supply sections to selectively supply either one of the premixed fuel and the diffusion combustion fuel, which comprises burning the premixed fuel at a first combustion stage while igniting the premixed fuel of the subsequent stage by a high-temperature gas generated from combustion of the premixed fuel of a preceding combustion state, said plurality of combustion stages including at least first to fifth stages and the premixed fuels of the respective stages are separately supplied and burned in series in order of the first stage fuel, second stage fuel, third stage fuel, fourth stage fuel and then the fifth stage fuel as a gas turbine load is increased, while when the gas turbine load is reduced, the premixed fuels are reduced in a reversed manner to that occurring when the load is increased in the order of the fifth stage fuel, the fourth stage fuel, the-third stage fuel, the second stage fuel and the first stage fuel, and wherein when the load is interrupted, supply of only the fourth stage fuel and the fifth stage fuel is suspended.