EP2047003B1 - Ensemble de pales deplaçables hautement résistant à la corrosion pour une turbine à vapeur, en particulier une turbine à impulsion géothermique - Google Patents

Ensemble de pales deplaçables hautement résistant à la corrosion pour une turbine à vapeur, en particulier une turbine à impulsion géothermique Download PDF

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Publication number
EP2047003B1
EP2047003B1 EP06796230.8A EP06796230A EP2047003B1 EP 2047003 B1 EP2047003 B1 EP 2047003B1 EP 06796230 A EP06796230 A EP 06796230A EP 2047003 B1 EP2047003 B1 EP 2047003B1
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EP
European Patent Office
Prior art keywords
turbine
max
blades
steam
movable blade
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.)
Active
Application number
EP06796230.8A
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German (de)
English (en)
Other versions
EP2047003A1 (fr
Inventor
Luciano Cozza
Mario Zannoni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ansaldo Energia SpA
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Ansaldo Energia SpA
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Publication of EP2047003A1 publication Critical patent/EP2047003A1/fr
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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 invention 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.
  • FR2809764-A1 discloses a steam turbine having a movable blade assembly wherein the blades have respective free ends that are not mechanically connected to one another.
  • US2006/140775-A1 discloses a steam turbine comprising a series of rotor blades made of a nickel alloy having specific compositions so as to maintain a high useful life of the rotor blades, even in case the turbine operates with geothermal vapours containing some aggressive or corrosive agents.
  • Number 1 in Figure 1 indicates a substantially known steam turbine, which is therefore only shown schematically. More specifically, 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 composition according to claim 1.
  • nickel-based metal alloy i.e. in which nickel is the predominant component, and which contains roughly over 45% by weight of nickel
  • 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 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.

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)

Claims (3)

  1. Ensemble de pales déplaçables hautement résistant à la corrosion (20) destiné à une turbine à vapeur, et plus particulièrement une turbine à impulsion géothermique, qui comprend un groupe (14) de pales de rotor (15) porté par un arbre (7) qui tourne autour d'un axe (A), chaque pale (15) s'étendant entre une extrémité (22) reliée audit arbre (7) et une extrémité libre (24) qui se termine par une partie supérieure (25) n'ayant aucune liaison mécanique avec les parties supérieures (25) des autres pales (15) ; ledit ensemble étant caractérisé en ce que lesdites pales (15) sont composées d'un alliage de métal à base de nickel qui se compose :
    - de nickel : 50 à 55% en poids
    - de chrome : 17 à 21% en poids
    - de niobium : 4,75 à 5,50% en poids
    - de molybdène : 2,80 à 3,30% en poids
    - de titane : 0,65 à 1,15% en poids
    - d'aluminium : 0,20 à 0,80% en poids
    - de fer : le reste
    - de cobalt : 1% en poids maximum
    - de carbone : 0,08% en poids maximum
    - de manganèse : 0,35% en poids maximum
    - de silicium : 0,35% en poids maximum
    - de phosphore : 0,015% en poids maximum
    - de soufre : 0,015% en poids maximum
    - de bore : 0,006% en poids maximum
    - de cuivre : 0,30% en poids maximum.
  2. Ensemble selon la revendication 1, caractérisé en ce que ledit alliage de métal est un alliage à base de nickel du groupe INCONEL® ou un matériau similaire.
  3. Turbine à vapeur (1), et en particulier turbine à impulsion géothermique, qui comprend un stator (5), et un rotor (6) relié intégralement à un arbre (7) qui tourne autour d'un axe de rotation (A) ; ladite turbine étant caractérisée en ce que ledit rotor (6) comprend un ensemble de pales mobiles (20) selon l'une quelconque des revendications précédentes.
EP06796230.8A 2006-07-25 2006-07-25 Ensemble de pales deplaçables hautement résistant à la corrosion pour une turbine à vapeur, en particulier une turbine à impulsion géothermique Active EP2047003B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2006/000565 WO2008012842A1 (fr) 2006-07-25 2006-07-25 Ensemble de pales deplaçables hautement résistant à la corrosion pour une turbine a vapeur, en particulier une turbine à impulsion géothermique

Publications (2)

Publication Number Publication Date
EP2047003A1 EP2047003A1 (fr) 2009-04-15
EP2047003B1 true EP2047003B1 (fr) 2013-09-04

Family

ID=37989174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06796230.8A Active EP2047003B1 (fr) 2006-07-25 2006-07-25 Ensemble de pales deplaçables hautement résistant à la corrosion pour une turbine à vapeur, en particulier une turbine à impulsion géothermique

Country Status (4)

Country Link
US (1) US20090324419A1 (fr)
EP (1) EP2047003B1 (fr)
JP (1) JP2009544895A (fr)
WO (1) WO2008012842A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6688598B2 (ja) * 2015-11-11 2020-04-28 三菱日立パワーシステムズ株式会社 オーステナイト鋼およびそれを用いたオーステナイト鋼鋳造品
CN107559049B (zh) * 2017-09-30 2023-12-12 南京赛达机械制造有限公司 一种高效汽轮机叶片

Family Cites Families (13)

* Cited by examiner, † Cited by third party
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 (fr) * 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 (ja) * 1993-12-16 1995-06-27 Toshiba Corp タービン動翼および製造方法
US7160400B2 (en) * 1999-03-03 2007-01-09 Daido Tokushuko Kabushiki Kaisha Low thermal expansion Ni-base superalloy
JP2001227301A (ja) * 2000-02-15 2001-08-24 Fuji Electric Co Ltd 蒸気タービン
FR2809764B1 (fr) * 2000-05-30 2002-11-29 Framatome Sa Etage de turbine a vapeur axiale
JP2003082476A (ja) * 2001-06-26 2003-03-19 Toshiba Corp 耐食・耐摩耗タービン部材および製造方法
JP2004124751A (ja) * 2002-09-30 2004-04-22 Toshiba Corp 蒸気タービンの湿分分離装置
JP2004169562A (ja) * 2002-11-18 2004-06-17 Toshiba Corp 蒸気タービン
JP4509664B2 (ja) * 2003-07-30 2010-07-21 株式会社東芝 蒸気タービン発電設備
EP1536026A1 (fr) * 2003-11-27 2005-06-01 Siemens Aktiengesellschaft Pièce résistante à des températures élevées
ITMI20042481A1 (it) * 2004-12-23 2005-03-23 Nuovo Pignone Spa Turbina a vapore

Also Published As

Publication number Publication date
EP2047003A1 (fr) 2009-04-15
US20090324419A1 (en) 2009-12-31
WO2008012842A1 (fr) 2008-01-31
JP2009544895A (ja) 2009-12-17

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