Gas turbine control method and gas turbine power generating apparatus
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsMakoto Kishi, Akihiko Saito, Takashi Sonoda, Shinsuke Nakamura, Sosuke Nakamura
Life of this patent
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Abstract
An object is to reduce a fluctuation in the gas-turbine output in a nozzle switching period. In the nozzle switching period during which a first nozzle group that has been used is switched to a second nozzle group that is going to be used, the amounts of fuel supplied through the first nozzle group and the second nozzle group are adjusted by using at least one adjustment parameter registered in advance, the adjustment parameter registered in advance is updated according to the operating condition of the gas turbine, and the updated adjustment parameter is registered as an adjustment parameter to be used next.
Claims10
A gas turbine control method for a gas turbine that includes a combustor and a plurality of nozzle groups grouped into a first main nozzle group and a second main nozzle group so as to be arranged on the circumference of a pilot nozzle, each of the first main nozzle group and the second main nozzle group having different numbers of main nozzles and supplying fuel gas to the combustor, and that switches the first main nozzle group and the second main nozzle group used for fuel supply according to an operating condition, the method comprising the steps of:
- receiving the operating condition from the gas turbine and calculating at least a first adjustment parameter, a second adjustment parameter and a third adjustment parameter from the operating condition;
- registering in advance at least the first adjustment parameter selected from a fuel-supply sharing ratio of the first main nozzle group with respect to a fuel supply command value, at least the second adjustment parameter selected from a fuel-supply sharing ratio of the second main nozzle group with respect to the fuel supply command value, and at least the third adjustment parameter selected so as to adjust at least one of the fuel-supply sharing ratio of the first main nozzle group and the fuel-supply sharing ratio of the second main nozzle group in a main nozzle group switching period, during which the first main nozzle group that has been used is switched to the second main nozzle group that is going to be used;
- determining a fuel supply command value of the first main nozzle group and a fuel supply command value of the second main nozzle group during the main nozzle group switching period using the fuel-supply sharing ratio of the first main nozzle group, the fuel-supply sharing ratio of the second main nozzle group, and the first, second and third adjustment parameters;
- updating the first, second and third adjustment parameters registered in advance, according to the operating condition of the gas turbine in which a fuel control based on the determined fuel supply command value of the first main nozzle group and the fuel supply command value of the second main nozzle group are reflected;
- and
- registering the updated adjustment parameters as adjustment parameters to be used next.
A gas turbine power generating apparatus that includes a combustor and a plurality of nozzle groups grouped into a first main nozzle group and a second main nozzle group so as to be arranged on the circumference of a pilot nozzle, and the each of the first main nozzle group and the second main nozzle group having different numbers of main nozzles and supplying fuel gas to the combustor and that switches the first main nozzle group and the second main nozzle group used for fuel supply according to an operating condition, comprising:
- a parameter setting section that receives the operating condition from the gas turbine and calculates at least a first, second and third adjustment parameters from the operating condition;
- said parameter setting section adjusts at least the first adjustment parameter selected from a fuel-supply sharing ratio of the first main nozzle group with respect to a fuel supply command value, at least the second adjustment parameter from a fuel-supply sharing ratio of the second main nozzle group with respect to the fuel supply command value, and at least the third adjustment parameter selected so as to adjust at least one of the fuel-supply sharing ratio of the first main nozzle group and the fuel-supply sharing ratio of the second main nozzle group in a main nozzle group switching period during which a first main nozzle group that has been used is switched to a second main nozzle group that is going to be used;
- a determining section for determining a fuel supply command value of the first main nozzle group and a fuel supply command value of the second main nozzle group during the main nozzle group switching period using the fuel-supply sharing ratio of the first main nozzle group, the fuel-supply sharing ratio of the second main nozzle group, and at least the first, second and third adjustment parameters;
- and
- an adjustment parameter update registration section that updates at least the first, second and third adjustment parameters according to the operating condition of the gas turbine in which a fuel control based on the determined fuel supply command value of the first main nozzle group and the fuel supply command value of the second main nozzle group are reflected, and that registers the updated adjustment parameters in the parameter setting section as adjustment parameters to be used next,
- wherein the gas turbine power generating apparatus allows a fluctuation in output of the gas turbine to be reduced.
Dependencies are inferred from the claim text.