GAS TURBINE AND ITS RATED OPERATIONAL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a gas turbine that can achieve the improvement of cooling efficiency of a turbine static system component in an active clearance control (ACC) system during rated operation of the gas turbine.SOLUTION: The gas turbine comprises a pressure rise device 40 that is connected to a branch flow passage 42, which is branched from a discharge side of a compressor 11, and capable of operating independently of the compressor 11 which boosts introduced air; a temperature control medium supply flow channel 43 that introduces compressed air boosted by the pressure rise device 40 to a turbine cooling medium flow passage 50 disposed in the static system component of a turbine 13; and a temperature control medium return flow passage 44 in which the compressed air which passes through the turbine cooling medium flow passage 50 is introduced and merged on the discharge side. The pressure rise device 40 operates during gas turbine rated operation and makes the compressed air flow into a blade ring of the turbine 13 via the inside of the turbine cooling medium flow passage 50 for cooling it.