| 摘要 |
PROBLEM TO BE SOLVED: To suppress energy loss of steam without shortening the life span of a steam turbine while cooling high-temperature components of the gas turbine with steam.SOLUTION: A gas turbine combined plant comprises a gas turbine 10 and an exhaust heat recovery device 100 which has an exhaust heat recovery boiler 110 and a steam turbine 121c. Further, the gas turbine combined plant comprises a cooling steam line 51 which supplies, as cooling steam CS, the steam bled from an intermediate stage of the steam turbine 121c to high-temperature components of the gas turbine 10, and a cooling steam recovery line 52 which returns the cooling steam passed through the high-temperature components to a region in a steam flow passage of the exhaust heat recovery device 100, in which blades of the steam turbine 121c do not exist and which is the region where pressure is lower than the pressure of steam in the intermediate stage of the steam turbine 121c. |
