| 摘要 |
PURPOSE:To reduce the consumption of cooling air used for cooling the blades of a gas turbine, by introducing cooling air to the inside of first-stage stator blades, carrying cooling air discharged from the inside of the first-stage stator blades to a heat exchanger, and then carrying cooling air, the temperature of which is lowered at the heat exchanger, to first-stage rotor blades. CONSTITUTION:Compressed cooling air B' supplied from a compressor is introduced into first-stage stator blades 2 from the inside thereof, and cooling air, the temperature of which is raised by cooling the stator blades 2, is discharged from the outside of the stator blades 2 and then carried to a heat exhcanger 14 via a cooling-air discharge pipe 13. In the heat exchanger 14, heated cooling air is cooled by a coolant C. Thereafter, the cooling air is carried to a wheel space 17 of turbine through a cooling-air supply pipe 15 and an air supply hole 16 formed in a rotating stub shaft and then supplied to first-stage rotor blades 3 and the rotor blades of the second and rearward stages through a groove 18 formed between a wheel 8 and a spacer 9. Further, cooling air may be supplied also to the stator blades 4 of the second and rearward stages through the spacer 9 and an air hole 19 formed in a diaphragm 10. |
