EP2047003A1 - Highly corrosion-resistant movable blade assembly for a steam turbine, in particular a geothermal impulse turbine - Google Patents
Highly corrosion-resistant movable blade assembly for a steam turbine, in particular a geothermal impulse turbineInfo
- Publication number
- EP2047003A1 EP2047003A1 EP06796230A EP06796230A EP2047003A1 EP 2047003 A1 EP2047003 A1 EP 2047003A1 EP 06796230 A EP06796230 A EP 06796230A EP 06796230 A EP06796230 A EP 06796230A EP 2047003 A1 EP2047003 A1 EP 2047003A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blades
- turbine
- steam
- movable blade
- blade assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/141—Shape, i.e. outer, aerodynamic form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
- F05C2201/0466—Nickel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/13—Refractory metals, i.e. Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
- F05D2300/131—Molybdenum
Definitions
- the present inventibn relates to a highly corrosion-resistant movable blade assembly for a steam turbine, in particular a geothermal impulse turbine, and to a steam turbine, in particular a geothermal impulse turbine, featuring such a movable blade assembly.
- a steam turbine normally comprises a number of successive stages which, in axial-flow turbines, are arranged coaxially with the turbine (machine) axis, so that the steam discharged from one stage flows directly and more or less axially into the next.
- the movable part of each stage comprises a number of blades arranged radially about the shaft and fixed to ⁇ the shaft by fasteners of various types (inverted-pine-shaped or hammer-headed fasteners) ; and the ends or tops of the blades are connected to one another by shroud rings fixed to the tops of the blades, for example, by riveting (upsetting) pegs formed on the tops of the blades or formed in one piece with the blades themselves.
- One known application of steam turbines is in geothermal energy generating systems, in which the fluid evolving in the turbine is defined by endogenous natural steam, i.e. steam generated directly in the earth as opposed to steam produced by conventional fossil- or nuclear-fuelled boilers or by heat-recovery boilers as in combination-cycle systems.
- endogenous natural steam i.e. steam generated directly in the earth as opposed to steam produced by conventional fossil- or nuclear-fuelled boilers or by heat-recovery boilers as in combination-cycle systems.
- endogenous steam is characterized, not only by much lower than normal thermodynamic conditions (substantially pressure and temperature) , but also by uncontrolled chemistry which depends strongly on the site from which the steam is extracted.
- the steam supplied to the turbine in geothermal systems is normally less than optimum, especially as regards chemical aggression.
- endogenous steam in fact normally contains various substances in various forms which impart aggressive characteristics to it which are totally absent in industrial steam, and which result in the formation of deposits on the steam turbine blades.
- the blades and shroud rings are normally made of martensitic stainless steel, such as AISI 403 or similar, which, being a good compromise between mechanical and erosion resistance characteristics, is widely used in steam turbines, even in geothermal systems .
- a highly corrosion-resistant movable blade assembly for a steam turbine, in particular a geothermal impulse turbine, comprising an array of rotor blades carried by a shaft rotating about an axis; the assembly being characterized in that each blade extends between one end attached to the shaft, and a free end terminating with a top portion with no mechanical connection to the top portions of the adjacent blades; and in that the blades are made of a nickel-based metal alloy preferably also containing chromium, iron, niobium, and molybdenum.
- the metal alloy contains over roughly 45% by weight of nickel; over roughly 15% by weight of chromium; over roughly 3% by weight of niobium; and over roughly 2% by weight of molybdenum.
- the metal alloy also advantageously contains smaller quantities of aluminium and titanium, in particular roughly 0.1 to 1% by weight of aluminium, and roughly 0.5 to 1.5% by weight of titanium.
- Figure 1 shows a schematic view of a geothermal steam turbine of substantially known configuration
- Figure 2 shows a schematic partial longitudinal section of one stage of the Figure 1 turbine featuring a movable blade assembly in accordance with the invention
- Figure 3 shows a partial view of a movable blade assembly in accordance with the invention.
- Turbine 1 is an axial impulse turbine of a geothermal power generating system.
- Turbine 1 substantially comprises a casing 2 having an inlet 3 and an outlet 4 for a stream of endogenous natural steam extracted from the earth.
- Casing 2 houses a stator 5 integral with casing 2; and a rotor 6 connected integrally to a drive shaft 7 extending through casing 2 along a rotation axis A.
- casing 2 houses a number of successive stages 10, each defined by an array 11 of fixed stator blades 12 integral with casing 2 and projecting substantially radially from an inner wall 13 of casing 2, and by an array 14 of movable rotor blades 15 carried by and rotating integrally with shaft 7.
- Figure 2 shows, purely schematically, a stage 10, in particular an impulse stage 10, of turbine 1.
- Stage 10 comprises a movable blade assembly 20 defined by blades 15, which are arranged substantially in a ring about shaft 7 and project radially from shaft 7 towards wall 13 of casing 2.
- blades 15 have a substantially concave profile, and may be of any known type, e.g. cylindrical with a constant section, tapered and/or twisted.
- Each blade 15 is fixed in known manner directly to shaft 7 or, as shown in Figure 2, to a supporting wheel 21 integral with shaft 7.
- Each blade 15 extends between a fastening end 22, having a connecting portion 23 for connection to shaft 7, and a free end 24 opposite fastening end 22 and terminating with a top portion 25 in no way connected mechanically to the top portions 25 of the other blades 15.
- assembly 20 and, in particular, blades 15 are made of a nickel-based metal alloy (i.e. in which nickel is the predominant component, and which contains roughly over 45% by weight of nickel) with a high chromium content (roughly over 15% by weight) , and also containing iron and significant quantities of niobium (roughly over 3% by weight) and molybdenum (roughly over 2% by weight) .
- the metal alloys used in accordance with the present invention are therefore substantially nickel-chromium alloys containing significant quantities of iron, niobium and molybdenum, together with smaller quantities of aluminium (roughly 0.1 to 1% by weight) and titanium (roughly 0.5 to 1.5% by weight).
- nickel-based alloys in the Special Metals Corporation INCONEL ® group are particularly indicated, and, in terms of corrosion resistance in geothermal applications, have proved far superior to conventional steel, in particular AISI 403 i martensitic steel.
- the INCONEL ® name includes a group of nickel-based alloys which can be age hardened, exhibit good creep resistance up to roughly 700°C, and are highly resistant to corrosion in general and to stress corrosion in particular.
- the movable blade assembly and, specifically, the rotor blades made in accordance with the invention are far more corrosion resistant than blades made of conventional materials;
- the materials used also have better mechanical characteristics, so that, for a given degree of erosion, resistance is improved and, hence, the working life of the component parts increased; eliminating the shroud ring (and any other member mechanically connecting the top portions of the blades) eliminates areas in which deposits (defined by substances in the steam) can accumulate on the rotor;
- the movable blade assembly according to the invention may also be used on steam turbines originally designed for conventional solutions, with only minor alterations to the original fixed parts.
- An assembly as claimed in one of the foregoing Claims characterized in tjiat the metal alloy contains over roughly 3% by weight of niobium, and over roughly 2% by weight of molybdenum.
- An assembly as claimed in one of the foregoing Claims characterized in that the metal alloy contains significant quantities of iron, niobium, and molybdenum, together with smaller quantities of
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2006/000565 WO2008012842A1 (en) | 2006-07-25 | 2006-07-25 | Highly corrosion-resistant movable blade assembly for a steam turbine, in particular a geothermal impulse turbine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2047003A1 true EP2047003A1 (en) | 2009-04-15 |
EP2047003B1 EP2047003B1 (en) | 2013-09-04 |
Family
ID=37989174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06796230.8A Active EP2047003B1 (en) | 2006-07-25 | 2006-07-25 | Highly corrosion-resistant movable blade assembly for a steam turbine, in particular a geothermal impulse turbine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090324419A1 (en) |
EP (1) | EP2047003B1 (en) |
JP (1) | JP2009544895A (en) |
WO (1) | WO2008012842A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6688598B2 (en) | 2015-11-11 | 2020-04-28 | 三菱日立パワーシステムズ株式会社 | Austenitic steel and cast austenitic steel using the same |
CN107559049B (en) * | 2017-09-30 | 2023-12-12 | 南京赛达机械制造有限公司 | Efficient turbine blade |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB283505A (en) * | 1927-01-11 | 1929-04-11 | Bbc Brown Boveri & Cie | Improvements in means for draining the low-pressure blading of steam turbines |
BE372479A (en) * | 1929-08-22 | 1930-08-05 | ||
US3619183A (en) * | 1968-03-21 | 1971-11-09 | Int Nickel Co | Nickel-base alloys adaptable for use as steam turbine structural components |
JPH07166803A (en) * | 1993-12-16 | 1995-06-27 | Toshiba Corp | Turbine moving blade and its manufacture |
US7160400B2 (en) * | 1999-03-03 | 2007-01-09 | Daido Tokushuko Kabushiki Kaisha | Low thermal expansion Ni-base superalloy |
JP2001227301A (en) * | 2000-02-15 | 2001-08-24 | Fuji Electric Co Ltd | Steam turbine |
FR2809764B1 (en) * | 2000-05-30 | 2002-11-29 | Framatome Sa | AXIAL TURBINE STAGE |
JP2003082476A (en) * | 2001-06-26 | 2003-03-19 | Toshiba Corp | Corrosion and wear resistant turbine member and manufacturing method |
JP2004124751A (en) * | 2002-09-30 | 2004-04-22 | Toshiba Corp | Moisture separation device for steam turbine |
JP2004169562A (en) * | 2002-11-18 | 2004-06-17 | Toshiba Corp | Steam turbine |
JP4509664B2 (en) * | 2003-07-30 | 2010-07-21 | 株式会社東芝 | Steam turbine power generation equipment |
EP1536026A1 (en) * | 2003-11-27 | 2005-06-01 | Siemens Aktiengesellschaft | High temperature resistant article |
ITMI20042481A1 (en) * | 2004-12-23 | 2005-03-23 | Nuovo Pignone Spa | STEAM TURBINE |
-
2006
- 2006-07-25 JP JP2009521419A patent/JP2009544895A/en active Pending
- 2006-07-25 EP EP06796230.8A patent/EP2047003B1/en active Active
- 2006-07-25 WO PCT/IT2006/000565 patent/WO2008012842A1/en active Application Filing
- 2006-07-25 US US12/374,905 patent/US20090324419A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2008012842A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20090324419A1 (en) | 2009-12-31 |
EP2047003B1 (en) | 2013-09-04 |
WO2008012842A1 (en) | 2008-01-31 |
JP2009544895A (en) | 2009-12-17 |
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