Vapour turbine
Vapor turbine operating with geothermal vapors containing corrosive agents such as chlorides and/or sulfides in particular. The turbine comprises a series of rotor blades made of a nickel alloy containing a quantity of nickel ranging from 55% to 59% by weight to avoid the washing of the geothermal vapors, maintaining a high useful life of the series of rotor blades and vapor turbine.
1. A vapour turbine operating with geothermal vapours containing corrosive agents including chlorides and/or sulfides wherein said turbine comprises a series of rotor blades made of a nickel-chromium-molybdenum-niobium (NCMN) alloy containing a quantity of nickel ranging from 55% to 59% by weight of said NCMN alloy; a quantity of chromium ranging from 19% to 22.5% by weight of said NCMN alloy; a quantity of molybdenum ranging from 7.0% to 9.5% by weight of said NCMN alloy; and a quantity of niobium ranging from 2.75% to 4% by weight of said NCMN alloy.
2. The turbine according to claim 1 , wherein said turbine further comprises a series of stator blades made of a nickel-chromium-molybdenum NCM alloy.
3. The turbine according to claim 2 , wherein said nickel-chromium-molybdenum alloy comprises a quantity of nickel ranging from 54% to 58% by weight of said NCM alloy, a quantity of chromium ranging from 21% to 23% by weight of said NCM alloy, and a quantity of molybdenum ranging from 12% to 14.5% by weight of said NCM alloy.
4. The turbine according to claim 2 , wherein said turbine further comprises a series of sealing laminas made of said nickel-chromium-molybdenum alloy.