Steam turbine, rotor shaft thereof, and heat resisting steel

Details Steam turbine, rotor shaft thereof, and heat resisting steel Steam turbine, rotor shaft thereof, and heat resisting steel

F - Mech Eng,Light,Heat,Weapons

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170/60

F01D 5/06 (2006.01) C21D 9/28 (2006.01) C21D 9/38 (2006.01) C22C 38/44 (2006.01) C22C 38/46 (2006.01) C22C 38/48 (2006.01) F01D 5/02 (2006.01) F01D 5/28 (2006.01) F01D 25/00 (2006.01)

Patent

CA 2009120

The present invention relates to a steam turbine comprising a rotor shaft integrating high and low pressure portions provided with blades at the final stage thereof having a length not less than 30 inches, wherein a steam temperature at first stage blades is 530°C, a ratio (L/D) of a length (L) defined between bearings of the rotor shaft to a diameter (D) measured between the terminal ends of final stage blades is 1.4 to 2.3. This rotor shaft is composed of heat resisting steel containing by weight 0.15 to 0.4% C, not more than 0.1% Si, 0.05 to 0.25% Mn, 1.5 to 2.5% Ni, 0.8 to 2.5% Cr, 0.8 to 2.5% Mo and 0.15 to 0.35% V and, further, the heat resisting steel may contain at least one of Nb, Ta, W, Ti, Al, Zr, B, Ca, and rare earth elements.

Cette invention concerne une turbine à vapeur à arbre de rotor comportant une partie haute pression et une partie basse pression, dont les ailettes du dernier étage ont une longueur d'au moins 30 pouces, dans laquelle la température de la vapeur dans le premier étage est de 530 degrés Celsius et qui est caractérisée par un rapport L/D de 1,4 à 2,3, L étant la distance entre les roulements de l'arbre de rotor et D le diamètre en bout d'ailettes du dernier étage. L'arbre de rotor est en acier résistant à la chaleur renfermant en masse de App# 0,15 àApp# 0,4 % de C, au plus App# 0,1 % de Si, deApp# 0,05 àApp# 0,25 % de Mn, de 1,5 à 2,5 % de Ni, de App# 0,8 à 2,5 % de Cr, de App# 0,8 à 2,5 % de Mo et deApp# 0,15 àApp# 0,35 % de V, et pouvant renfermer en plus au moins un des éléments du groupe Nb, Ta, W, Ti, Al, Zr, B, Ca et des terres rares.

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