VALVE CONTROL DEVICE, GAS TURBINE, AND VALVE CONTROL METHOD

摘要

A valve control device (50) controls the degree of opening of a pressure adjust-ment valve (44), and is provided in a gas turbine (12), which is equipped with: a combustor (22) that generates combustion gas by burning a fuel; a turbine (24) driven by the combustion gas gen-erated by the combustor (22); a flow volume and-justment valve (42) that adjusts the flow volume of the fuel supplied to the combustor (22); and the pressure adjustment valve (44) that adjusts the fuel pressure and is arranged upstream from the flow volume adjustment valve (42) in a fuel flow path (40) that supplies fuel to the combustor (22). The valve control device (50) is equipped with a load reduction detection unit (52), which detects a reduction in the load of the gas turbine (12), and a pressure control unit (56) which, when a load reduction has been detected by the load re-duction detection unit (52), controls the degree of opening of the pressure adjustment valve (44) in response to the output of the gas turbine (12) after the load reduction. Thus, the valve control device (50) prevents unstable output from the gas turbine even when the load decreases sharply.