Patent ID: 9670847
Date: 2017-06-06
CPC Classifications: F02C,F05D

Claim:
1. A 2-shaft gas turbine comprising: a gas generator including a compressor provided with an inlet guide vane at an intake, a combustor for burning air compressed in the compressor and fuel to generate combustion gas, and a high-pressure turbine rotated by the combustion gas from the combustor to drive the compressor; a power turbine rotated by discharge gas from the high-pressure turbine to drive load equipment; and a controller configured to control rotating speed of the gas generator on the basis of a difference between a target speed and an actual rotating speed of the gas generator, wherein control parameters of the compressor include at least an outlet temperature of the compressor, wherein the 2-shaft gas turbine further comprises a first temperature detector for detecting the outlet temperature, and wherein the controller is further configured to compute a degree of a compressor efficiency degradation from the control parameters and set, in accordance with the degree of the compressor efficiency degradation, due to a decrease in performance with long-term use, the target speed at a level lower than the target speed in a state where the compressor efficiency degradation has not occurred.