| 摘要 |
A steam turbine 20 is provided with a casing 109, a turbine rotor 25 disposed through the casing 109, and labyrinth portions 50, 55 which are disposed at the boundary between the casing 109 and the turbine rotor 25. The steam turbine 20 is further provided with a sealing steam pipe 65 for supplying sealing steam to the labyrinth portions 50, 55 and a gas supply pipe 60 for supplying the labyrinth portions 50, 55 with a cooling gas for cooling the turbine rotor 25 or a heating gas for heating the turbine rotor 25.
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