Gas turbine control system, gas turbine operating method, and program

Abstract

The present invention provides a gas turbine control device that can reduce combustion vibrations that occur during fuel switching of the combustor while maintaining high-load operation of the gas turbine. [Solution] The control device for the gas turbine has a basic operating mode in which it operates using either the first fuel or the second fuel, and a fuel switching operating mode in which it operates while switching between the first fuel and the second fuel. The control device controls the first nozzle distribution ratio, which is the ratio of the calorific value of the fuel supplied to the first nozzle to the total calorific value, which is the sum of the calorific values ​​of the fuel supplied to all of the nozzles, so that the fuel switching operating mode is higher than the basic operating mode at the same gas turbine output.

Claims

1. A compressor that compresses air, A combustor having a plurality of nozzles including a first nozzle, which can switch between injecting a first fuel and a second fuel having a different composition from the first fuel from each nozzle, and which burns compressed air supplied from the compressor and the fuel to generate combustion gas, A turbine that can be rotated by the aforementioned combustion gas, A control device for a gas turbine having, A basic operating mode in which the vehicle operates using the first fuel or the second fuel, The system includes a fuel switching operation mode in which the system operates while switching between one of the first fuel and the second fuel, The first nozzle distribution ratio, which is the ratio of the calorific value of the fuel supplied to the first nozzle to the total calorific value, which is the sum of the calorific values ​​of the fuel supplied to all of the multiple nozzles, is controlled such that it is higher in the fuel switching operation mode than in the basic operation mode at the same gas turbine output. A control system for a gas turbine.

2. The opening of the inlet guide vane provided at the inlet of the compressor is controlled such that, at the same gas turbine output, the opening is greater in the fuel switching operation mode than in the basic operation mode. The control device for a gas turbine according to claim 1.

3. The nozzle includes a second nozzle that is different from the first nozzle. In the fuel switching operation mode, the system controls the injection of water along with the fuel from the second nozzle. A control device for a gas turbine according to claim 1 or 2.

4. The nozzle includes a second nozzle and a third nozzle that are different from the first nozzle. The third nozzle distribution ratio, which is the ratio of the calorific value of the fuel supplied to the third nozzle to the total calorific value, which is the sum of the calorific values ​​of the fuel supplied to all of the multiple nozzles, and the first nozzle distribution ratio are both controlled such that the fuel switching operation mode is higher than the basic operation mode at the same gas turbine output. In the fuel switching operation mode, the ratio of the calorific value of the fuel supplied to the second nozzle to the total calorific value, which is the sum of the calorific values ​​of the fuel supplied to all of the nozzles, is lowered by the amount by which the first nozzle distribution ratio and the third nozzle distribution ratio are increased. A control device for a gas turbine according to claim 1 or 2.

5. The first nozzle is a pilot nozzle. A control device for a gas turbine according to claim 1 or 2.

6. The second nozzle is the main nozzle, and the third nozzle is the top-hat nozzle. The control device for a gas turbine according to claim 4.

7. A compressor that compresses air, A combustor having a plurality of nozzles including a first nozzle and a second nozzle different from the first nozzle, and capable of switching between injecting a first fuel and a second fuel having a different composition from the first fuel from each nozzle, and generating combustion gas by burning compressed air supplied from the compressor and the fuel, A turbine that can be rotated by the aforementioned combustion gas, A control device for a gas turbine having, A basic operating mode in which the vehicle operates using the first fuel or the second fuel, The system includes a fuel switching operation mode in which the system operates while switching between one of the first fuel and the second fuel, In the fuel switching operation mode, the system controls the injection of water along with the fuel from the second nozzle. A control system for a gas turbine.

8. A compressor that compresses air, A combustor having a plurality of nozzles including a first nozzle, which can switch between injecting a first fuel and a second fuel having a different composition from the first fuel from each nozzle, and which burns compressed air supplied from the compressor and the fuel to generate combustion gas, A turbine that can be rotated by the aforementioned combustion gas, A method for operating a gas turbine having, A basic operating mode in which the vehicle operates using the first fuel or the second fuel, The system includes a fuel switching operation mode in which the system operates while switching between one of the first fuel and the second fuel, A step of controlling the first nozzle distribution ratio, which is the ratio of the calorific value of the fuel supplied to the first nozzle to the total calorific value, which is the sum of the calorific values ​​of the fuel supplied to all of the multiple nozzles, so that it is higher in the fuel switching operation mode than in the basic operation mode at the same gas turbine output. A method for operating a gas turbine having [a specific feature / feature].

9. A compressor that compresses air, A combustor having a plurality of nozzles including a first nozzle, which can switch between injecting a first fuel and a second fuel having a different composition from the first fuel from each nozzle, and which burns compressed air supplied from the compressor and the fuel to generate combustion gas, A turbine that can be rotated by the aforementioned combustion gas, A control device for a gas turbine having: A basic operating mode in which the vehicle operates using the first fuel or the second fuel, The system includes a fuel switching operation mode in which the system operates while switching between one of the first fuel and the second fuel, A step of controlling the first nozzle distribution ratio, which is the ratio of the calorific value of the fuel supplied to the first nozzle to the total calorific value, which is the sum of the calorific values ​​of the fuel supplied to all of the multiple nozzles, so that it is higher in the fuel switching operation mode than in the basic operation mode at the same gas turbine output. A program that executes the command.

Images