| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-pressure steam turbine, capable of suppressing, when steam boiled up and evaporated within a water supply heater flows back to a steam flow passage constituted within the thickness of a casing, fluctuation of a fluid pressure acting on a stator blade or a rotor blade in addition to drift of the steam in the steam flow passage.SOLUTION: The low-pressure steam turbine 12 includes the casing 20; a turbine rotor 22 provided to extend through the casing 20 and having the rotor blade 21 planted thereon; the stator blade 23 disposed in the casing 20; a steam inlet pipe for introducing steam to the steam flow passage including the stator blade 23 and the turbine blade 23; and an exhaust flow passage for guiding the steam to the outside. An extraction flow passage 31 for guiding extracted steam to an extraction pipe 16 is formed within the thickness of the casing 20. A passage throttle member 50 for throttling the flow of steam by reducing the sectional area of the flow passage for carrying the steam is provided in the vicinity of a part communicating with the extraction flow passage 31 of the extraction pipe 16. |
