| 摘要 |
PURPOSE:To provide a steam turbine using blades having an attack preventive piece at the steam inlet, with prevention of corrosion through early drying of water drops attached to the blades, by furnishing a nozzle from which dried hot air jets out to the area around the blades. CONSTITUTION:In this steam turbine the inner and outer ends of each of a number of nozzle blades 1 arranged in the circumferential direction are fixed to an inner 2 and an outer 3 ring. A step is formed by a blade rotation part consisting of a nozzle stationary part fixed the outer ring 3 to the inner casing 4 and a vane 7 installed at a disc 6 fitted on the rotor 5. Here a nozzle 12 is fixed to a steam guide 11 installed at the inner casing 4, and the nozzle 12 is connected to a hot wind dryer 15 by a pipe 13 through a valve 14. Nozzles 12 are installed in a plural number along the circumference of the steam guide 11 in such a way as facing with its tip toward the vane 7, and the dried hot air is blown to the vane 7. |
