GAS TURBINE AND OPERATING METHOD THEREFOR

摘要

Provided is a gas turbine in which faster start-up of the gas turbine can be achieved by the rapid operation control of an ACC system during the start-up of the gas turbine; the cooling efficiency of the turbine stationary system component is improved; and the operations required to prevent cat-back when the gas turbine stops can be carried out more quickly. The gas turbine is provided with a pressure-boosting device (40) which is connected to a branch flow path (42) branching from the discharge side of a compressor (11) and can operate independently of the compressor (11) which introduces and raises the pressure of the air; a temperature-adjusting medium supply path (43) in which the compressed air of which the pressure has been raised by the pressure-boosting device (40) is introduced to a turbine cooling medium flow path (50) provided in the stationary system component of the turbine (13); and a temperature-adjusting medium return flow path (44) in which the compressed air which passes through the turbine cooling medium flow path (50) is introduced and merges on the discharge side of the compressor (11). The pressure-boosting device (40) operates during start-up of the gas turbine and as a preparation immediately before the start-up. Compressed air flows in the turbine cooling medium flow path (50) and the temperature is raised or cooling takes place. The pressure-boosting device (40) operates when the gas turbine stops, and the high-temperature gas remaining in the turbine (13) is exhausted.