Two-Shaft Gas Turbine

摘要

A 2-shaft gas turbine is provided that can suppress an increase in NOx emission from a combustor even when degradation of a compressor efficiency occurs due to decrease in performance with long-term use.;The 2-shaft gas turbine having a gas generator and a power turbine includes: means for measuring control parameters of the compressor; and a controller configured to set, in accordance with the degree of the degradation of the compressor efficiency computed from the measured control parameters, a target speed of the gas generator at a level lower than a target speed in a state where degradation of the compressor efficiency has not occurred, and to control the rotating speed of the gas generator on the basis of a difference between the target speed thus set and an actual rotating speed.

主权项

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; means for measuring control parameters of the compressor; and a controller configured to
set, in accordance with a degree of degradation of the compressor efficiency computed from the measured control parameters, a target speed of the gas generator at a level lower than a target speed in a state where the degradation of the compressor efficiency has not occurred, andcontrol rotating speed of the gas generator on the basis of a difference between the target speed thus set and an actual rotating speed.