EP2669472A1 - Rotor pour une turbomachine, turbomachine et turbine à vapeur - Google Patents

Rotor pour une turbomachine, turbomachine et turbine à vapeur Download PDF

Info

Publication number
EP2669472A1
EP2669472A1 EP12170472.0A EP12170472A EP2669472A1 EP 2669472 A1 EP2669472 A1 EP 2669472A1 EP 12170472 A EP12170472 A EP 12170472A EP 2669472 A1 EP2669472 A1 EP 2669472A1
Authority
EP
European Patent Office
Prior art keywords
shaft
ring
rotor
turbomachine
steam turbine
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.)
Withdrawn
Application number
EP12170472.0A
Other languages
German (de)
English (en)
Inventor
Ingo Förster
Christoph Hermann Dr. Richter
Frank Dr. Truckenmüller
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP12170472.0A priority Critical patent/EP2669472A1/fr
Publication of EP2669472A1 publication Critical patent/EP2669472A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/025—Fixing blade carrying members on shafts
    • 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/007—Preventing corrosion
    • 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
    • F05D2260/00—Function
    • F05D2260/95—Preventing corrosion

Definitions

  • the invention relates to a rotor for a turbomachine and a turbomachine.
  • An axial flow machine for example a steam turbine, has a rotor with a shaft and blades mounted thereon.
  • the blade connection is formed by blade roots of the blades and rotor claws with which the blade roots are positively secured to the shaft.
  • Each blade root is formed, for example, as a fir tree-like projection on the blade and the associated rotor claw is made as a complementary shape of the projection groove, which engages the associated blade root.
  • the blade connections can tire, so that their strength is reduced.
  • stress corrosion cracking may appear on the rotor claws.
  • the low-cycle loads such as, for example, centrifugal force and steam bending, lead to such a high load on the blade connections that the maximum permissible steam turbine starting number is thereby determined.
  • the blade connections are exposed to vibrational stresses that can lead to material fatigue, which may cause cracks at the blade roots and / or at the rotor claws. With appropriate crack growth, this can lead to a scoop crack or a blade break. Furthermore, the crack formation at the blade connection can be promoted by high static stresses with corrosive influence of the process steam.
  • the object of the invention is to provide a rotor for a turbomachine and the turbomachine, in which the above problems are overcome and the rotor has a long life.
  • the rotor according to the invention for the turbomachine in which a corrosive fluid is flowable, has a shaft and at least one radially outwardly around the shaft cohesively mounted ring which is adapted to connect a plurality of blades form fit to the shaft, the shaft of a korrosionsrissan coden Material and the ring made of a korrosionsrissunan réelleen material and designed in the radial direction is so thick that transmitted from the ring to the shaft voltages in the shaft are so homogeneous that a stress corrosion cracking of the shaft is prevented.
  • the ring is produced from the material susceptible to corrosion cracking, stress corrosion cracking is advantageously prevented, in particular in the region of the blade connections, as a result of which the rotor has a long service life.
  • the stresses which are transmitted from the ring to the shaft are homogenized, whereby any occurring voltage spikes in the shaft are prevented. Therefore, a possible occurrence of stress corrosion cracking of the shaft, although made of a corrosion crack susceptible material, is inhibited.
  • the ring preferably has chrome steel.
  • the chrome steel preferably has a mass fraction of chromium of 5% to 20%.
  • X2CrNi12 or X12Cr13 can be used.
  • the chrome steel is resistant to corrosion and to acid. This makes the chrome steel resistant to stress corrosion cracking.
  • the chromium steel has a high fatigue strength, which is advantageous a high number of starts of the turbomachine is achieved.
  • the shaft preferably has nickel steel, in particular with 3.5 percent by weight nickel.
  • the ring is preferably secured by welding material fit to the shaft. This results in an advantageous fixed connection of the ring to the shaft.
  • a buffer layer is provided between the shaft and the ring.
  • the buffer layer may be provided to compensate for possible differential expansion of the ring and the shaft to avoid stress on both the ring and the shaft.
  • the buffer layer can act as a primer layer between the ring and the shaft to improve the cohesive connection of ring and shaft.
  • the shaft has a circumferential projection, to which the ring is cohesively attached. This results in a good accessibility of a tool in the cohesive attachment of the ring, in particular a good accessibility of a welding tool.
  • a radius is provided at the transition between the shaft and the projection so that any notch stress effects that occur are so attenuated that no stress corrosion cracking occurs in the shaft.
  • the turbomachine according to the invention comprises the rotor according to the invention.
  • the flow machine is preferably a steam turbine.
  • the steam turbine preferably has the at least one ring in the last, downstream stage of the steam turbine.
  • the blades in the last stage of the steam turbine are the blades with the longest radial extensions in the steam turbine and are thus particularly susceptible to vibration excitation. Providing the ring in this stage is therefore particularly advantageous.
  • one stage here denotes the entirety of a blade row and an associated row of guide blades.
  • FIG. 1 shows a section of a longitudinal section of a rotor according to the invention.
  • a steam turbine has a rotor 1.
  • a corrosive fluid is flowable, which is, for example, mixed with hydrogen sulfide process steam 10.
  • the rotor 1 has a shaft 2 and a ring 3 arranged around the shaft 2.
  • the rotor 1 further comprises a blade ring with a plurality of blades (not shown in the figure), which are positively secured to the ring 2.
  • the blades blade roots and the ring 3 grooves wherein the shapes of the blade roots and the grooves are coordinated so that the blades are positively fastened to the ring.
  • the grooves also referred to as rotor claws, and the blade roots may have a fir-tree shaped profile.
  • the shaft 2 has a radially projecting and axially symmetrical shaped projection 5, on which the ring 3 is arranged. It is also possible in principle to provide no projection.
  • the shaft has a first shaft outer side 6 and a second shaft outer side 7, which are arranged on opposite sides of the projection 5.
  • the shaft 2 has a larger diameter in the region of the first shaft outer side 6 than in the region of the second shaft outer side 7. This may be the case, for example, if the rotor blade ring is the rotor blade ring arranged in the last, downstream stage of the steam turbine.
  • the portion of the smaller diameter shaft may be coupled to a generator. But it is also possible that the shaft on both sides of the projection 5 has the same diameter.
  • the first shaft outer side 6 has a first radius 8 and the second shaft outer side 7 has a second radius 9 with which the shaft outer sides 6, 7 merge into the projection 5, so that notch stress effects are advantageously prevented.
  • the first radius 8 is smaller than the second radius 9. It is also conceivable to carry out both radii of equal size.
  • the ring 3 is integrally formed on the two radii 8, 9.
  • the shaft is made of a nickel steel, in particular with a proportion of 3.5 percent by weight nickel, the remaining portion being essentially iron. The disadvantage here, however, that the nickel steel is susceptible to stress corrosion cracking.
  • the ring 3 is made of a korrosionsrissunan stricten material, preferably a chrome steel.
  • the ring is applied by welding to the shaft 2, wherein in the figure between the shaft 2 and the ring 3, a buffer layer 4 is provided.
  • the buffer layer 4 can act as a primer layer for a better connection of the ring 3 to the shaft 2.
  • the buffer layer 4 can also compensate for a difference in expansion occurring between the ring 3 and the shaft 2 during operation of the steam turbine.
  • the ring 3 can also be welded onto the shaft 2 without the provision of a buffer layer.
  • the ring 3 is made so thick in the radial direction that a sufficiently large distance from the radial inside the grooves can be provided to the shaft 2. At the sufficiently large distance, the stresses propagating from the blade roots to the shaft 2 are so homogeneous that stress peaks are prevented which can lead to stress corrosion cracking.
  • a plurality of rings for a plurality of blade rings.
  • the rings may be provided for the blade rings, which are most heavily loaded by centrifugal forces and / or vibrations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP12170472.0A 2012-06-01 2012-06-01 Rotor pour une turbomachine, turbomachine et turbine à vapeur Withdrawn EP2669472A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12170472.0A EP2669472A1 (fr) 2012-06-01 2012-06-01 Rotor pour une turbomachine, turbomachine et turbine à vapeur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12170472.0A EP2669472A1 (fr) 2012-06-01 2012-06-01 Rotor pour une turbomachine, turbomachine et turbine à vapeur

Publications (1)

Publication Number Publication Date
EP2669472A1 true EP2669472A1 (fr) 2013-12-04

Family

ID=46318879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12170472.0A Withdrawn EP2669472A1 (fr) 2012-06-01 2012-06-01 Rotor pour une turbomachine, turbomachine et turbine à vapeur

Country Status (1)

Country Link
EP (1) EP2669472A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3269924A1 (fr) * 2016-07-14 2018-01-17 Siemens Aktiengesellschaft Arbre de rotor et procede de fabrication d'un arbre de rotor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0207259A1 (fr) * 1985-06-18 1987-01-07 BBC Brown Boveri AG Méthode de fixation des aubes sur le rotor d'une seule turbine à vapeur
US5024582A (en) * 1990-08-14 1991-06-18 Westinghouse Electric Corp. Steam turbine rotor having graded weldments
US5746579A (en) * 1996-12-27 1998-05-05 Westinghouse Electric Corporation Stress corrosion resistant rims and discs for steam turbine rotors device and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0207259A1 (fr) * 1985-06-18 1987-01-07 BBC Brown Boveri AG Méthode de fixation des aubes sur le rotor d'une seule turbine à vapeur
US5024582A (en) * 1990-08-14 1991-06-18 Westinghouse Electric Corp. Steam turbine rotor having graded weldments
US5746579A (en) * 1996-12-27 1998-05-05 Westinghouse Electric Corporation Stress corrosion resistant rims and discs for steam turbine rotors device and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3269924A1 (fr) * 2016-07-14 2018-01-17 Siemens Aktiengesellschaft Arbre de rotor et procede de fabrication d'un arbre de rotor
WO2018011081A1 (fr) * 2016-07-14 2018-01-18 Siemens Aktiengesellschaft Arbre de rotor et procédé de fabrication d'un arbre de rotor
US11066933B2 (en) 2016-07-14 2021-07-20 Siemens Energy Global GmbH & Co. KG Rotor shaft and method for producing a rotor shaft

Similar Documents

Publication Publication Date Title
CH698043B1 (de) Schaufelend-Deckbandsegment für eine Turbinenschaufel und Turbine.
DE102015101156A1 (de) Laufschaufel mit hoher Sehnenlänge, zwei Teilspannweiten-Dämpferelementen und gekrümmtem Schwalbenschwanz
EP3199758B1 (fr) Rotor dans une turbine à gaz de type blisk (disque à aubes) ou bling (bague à aubes)
EP2851518B1 (fr) Modules d'une turbomachine
EP2719865A1 (fr) Insert pour connexions aube-disque de turbomachines
EP3404210A1 (fr) Segment de grille d'aubes d'une turbomachine avec paroi de plateforme non-axisymétrique , grille d'aubes, canal d'aube, plateforme, turbomachine associés
DE102008037554A1 (de) Schwalbenschwanzbefestigung zur Verwendung mit Turbinenanordnungen und Verfahren zur Montage von Turbinenanordnungen
DE102016222720A1 (de) Dichtungssystem für eine axiale Strömungsmaschine und axiale Strömungsmaschine
DE102010007724A1 (de) Schraubenlose Zwischenstufendichtung einer Gasturbine
EP3043085A1 (fr) Agencement d'aubes pour une turbo-machine thermique à flux axial et procédé de montage d'un élément amortisseur entre deux aubes d'une couronne d'aube d'une turbo-machine thermique
EP1905954A1 (fr) Aube de turbine
EP2696039B1 (fr) Étage de turbine à gaz
EP2019188A1 (fr) Etage de rotor comprenant un dispositif d'amortissement
DE102009013819A1 (de) Verfahren zur Herstellung eines Leitschaufelkranzes für eine Gasturbine sowie Leitschaufelkranz
EP3156588B1 (fr) Procede de reparation d'elements d'etancheite
EP3015715A1 (fr) Anneau de stator de turbomachine et turbomachine
DE102009007664A1 (de) Abdichtvorrichtung an dem Schaufelschaft einer Rotorstufe einer axialen Strömungsmaschine
EP2669472A1 (fr) Rotor pour une turbomachine, turbomachine et turbine à vapeur
EP2090751A1 (fr) Aube pour turbomachine
EP3441563B1 (fr) Rotor pour une turbomachine
DE102011052037A1 (de) Strömungsteileranordnung für Dampfturboantrieb und Verfahren
EP2454451B1 (fr) Rotor avec éléments d'accouplement pour accoupler mécaniquement des aubes
EP3015652A1 (fr) Aube mobile de turbine
DE102015209369A1 (de) Abgasturbolader
DE102021201211B4 (de) Turbinenrad für Gasturbinen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140605