Integrated gasification combined cycle and operation control method thereof
View Patent ↗An integrated gasification combined cycle that can adjust the balance of pressure/temperature in an overall plant and can stabilize the output of a gas turbine at an early stage during load variation, and an operation control method of the integrated gasification combined cycle are provided. When a calorific abnormality of fuel gas is detected during load variation of a gas turbine ( 5 b ), a load change command value of the gas turbine ( 5 b ) is set to zero or is decreased, and based on this load change command value, a power generation output command of the gas turbine ( 5 b ) is generated.
1. An operation control method of an integrated gasification combined cycle, comprising:
providing a power generator command from a shaft load setting device;
detecting a fuel gas calorific value, wherein when a calorific abnormality of the fuel gas is detected during load variation of a gas turbine, setting a load change command value of the gas turbine to zero or decreasing to a value greater than zero, and
outputting a power generation output command of the gas turbine according to the load change command value and the power generator command.
2. The operation control method of an integrated gasification combined cycle, according to claim 1 , wherein in a case in which the load change command value is decreased to a value greater than zero, a range of decrease of the load change command value is determined in accordance with the range of change of the calorific value of the fuel gas.
3. The operation control method of an integrated gasification combined cycle, according to claim 1 , wherein after a load change demand of the gas turbine is set to zero or is decreased, the load change command value of the gas turbine is returned to a normal level in accordance with the range of change of the calorific value of the fuel gas.
4. An operation control method of an integrated gasification combined cycle, comprising:
a first step of generating a power generation output command of a gas turbine using a value obtained by subtracting a power generation output of a steam turbine from a power generator output command that is generated from a shaft load setting device,
wherein a gasification furnace is controlled using the power generation output command of the gas turbine obtained in the first step.
5. The operation control method of an integrated gasification combined cycle, according to claim 4 , wherein, by using a table or a relational expression in which the power generation output command of the gas turbine and required amounts of elements to be charged into the gasification furnace are related with each other, the required amounts of the elements corresponding to the power generation output command of the gas turbine obtained in the first step are obtained, and correction amounts corresponding to a range of variation of the power generation output command of the gas turbine or a range of variation of the power generation output of the gas turbine are added to the obtained required amounts to determine final required amounts of the elements, so that based on the final required amounts, the amounts of the elements to be charged into the gasification furnace are controlled.
6. The operation control method of an integrated gasification combined cycle, according to claim 4 , wherein, while the gas turbine is in a temperature control state, the load change command value of the gas turbine is set to zero or is decreased to a value greater than zero, and the power generation output command of the gas turbine is generated based on the load change command value.
7. The operation control method of an integrated gasification combined cycle, according to claim 4 , wherein, while the gas turbine is in a temperature control state, the gasification furnace is controlled by using the power generation output of the gas turbine instead of the power generation output command of the gas turbine.
8. An integrated gasification combined cycle comprising
a gas turbine control apparatus having a shaft load setting device that provides a power generator output command,
a rate setting unit that receives a calorific value signal of fuel gas, wherein, when a calorific abnormality of the fuel gas is detected during load variation of a gas turbine, a load change command value of the gas turbine is set to zero or is decreased to a value greater than zero, and,
a rate limiting unit that generates a power generation output command of the gas turbine based on an output from the rate setting unit and the power generator output command.
9. An integrated gasification combined cycle, comprising:
a gas turbine control apparatus having a shaft load setting device that provides a power generator output command,
a rate limiting unit for generating a power generation output command of a gas turbine using a value obtained by subtracting a power generation output of a steam turbine from the power generator output command, and a gasification furnace control apparatus for controlling a gasification furnace using the power generation output command of the gas turbine.