EP0873467A2 - Systeme de paliers pour ensemble de turbomachines - Google Patents

Systeme de paliers pour ensemble de turbomachines

Info

Publication number
EP0873467A2
EP0873467A2 EP96946245A EP96946245A EP0873467A2 EP 0873467 A2 EP0873467 A2 EP 0873467A2 EP 96946245 A EP96946245 A EP 96946245A EP 96946245 A EP96946245 A EP 96946245A EP 0873467 A2 EP0873467 A2 EP 0873467A2
Authority
EP
European Patent Office
Prior art keywords
machine
shaft
bearings
machine set
set according
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Withdrawn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
EP96946245A
Other languages
German (de)
English (en)
Inventor
Klaus Nitsche
Helmut Maghon
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of EP0873467A2 publication Critical patent/EP0873467A2/fr
Withdrawn legal-status Critical Current

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
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
    • F02C3/04—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor
    • F02C3/10—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor with another turbine driving an output shaft but not driving the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/06—Arrangements of bearings; Lubricating

Definitions

  • the invention relates to a machine set comprising a rotatable shaft train, two machines seated thereon, which exchange energy between one another by rotation of the shaft train, and a plurality of bearings, each of which supports the shaft train.
  • the invention relates in particular to a machine set with a first machine in the form of a turbine, in particular a free-running gas turbine, and a second machine in the form of a generator.
  • the rotating shaft train transmits mechanical energy, which is obtained from the turbine by relaxing a flow medium, to the generator, which converts the mechanical energy into electricity.
  • a "free-running gas turbine” is understood to mean a turbine which is acted upon by a fluid in the manner of a hot flue gas, the fluid being not provided for condensation behind the turbine, and which turbine is not mechanically operatively connected to it another machine in the manner of a turbo compressor or the like; the turbine is only mechanically coupled to the other machine of the machine set.
  • gas turbine in the present context does not correspond to the widespread practice according to which a gas turbine comprises a unit comprising a compressor for providing compressed air, a combustion device for burning a fuel in the compressed air to form a flue gas and at least one turbine in the actual sense to relax the flue gas.
  • a gas turbine plant for the purpose of differentiation.
  • the invention relates in particular to a machine set with a turbine which is part of a gas turbine plant of the so-called "two-shaft type".
  • a gas turbine system of the two-shaft type contains two turbines which are seated on different shaft trains. One of the turbines and a compressor, which is driven by the first shaft train, sit on a first shaft train.
  • the other turbine is seated on a second shaft train, and this other turbine is connected via the second shaft train to an external driven machine, for example a generator.
  • an external driven machine for example a generator.
  • the other turbine, the second shaft train and the driven machine form a machine set which can be designed as stated in the introduction.
  • the shaft train is supported twice in each machine, so that a total of at least four bearings support the shaft train.
  • each machine has its own shaft, which is supported at least twice, and the shaft train is formed by coupling the shafts together.
  • the object of the invention is to significantly simplify the machine set of the type mentioned.
  • a machine set comprising a rotatable shaft train, two machines sitting on it, which exchange energy between one another by rotation of the shaft train, and a large number of bearings, each of which supports the shaft train, only three bearings being present.
  • the invention is based on the surprising finding that it is sufficient to load a shaft train intended for the exchange of energy between two machines only three times.
  • the bearings in the machine set are preferably distributed such that a bearing is directly adjacent to a first machine of the machine set and two bearings are directly adjacent to a second machine of the machine set.
  • the first machine preferably additionally has a guide ring which surrounds the shaft train, by means of which the shaft train can be supported in the event of a deformation from a normal shape.
  • the bearing immediately adjacent to the first machine is, in particular, an internal bearing installed in the first machine.
  • the term "immediately adjacent” does not mean that the bearings and the machines in the machine set should be spaced apart.
  • the bearings can very well be integral parts of the machines.
  • the first machine is preferably a turbine, in particular a free-running gas turbine, and the second machine is preferably a generator.
  • the first machine can also be the generator and the second machine the turbine.
  • the turbine can be of such a type that when it is operating it exerts an axial thrust on the shaft train, that is to say a force directed in a longitudinal direction of the shaft train.
  • This force has to be absorbed, and for this purpose one of the bearings in particular is a bearing that absorbs such an axial thrust, that is to say an axial bearing.
  • This thrust bearing can be any of the three bearings; The positioning of the thrust bearing can be decided according to the circumstances of the individual case.
  • the two other bearings can be simple radial bearings, which only absorb forces that are directed perpendicular to the longitudinal direction of the shaft train.
  • the shaft train is formed from two partial shafts and an intermediate shaft coupled to the partial shafts between the partial shafts and between the machines, which has a bending stiffness which is significantly lower than the bending stiffness of the partial shafts, and in which each bearing is of the Intermediate shaft spaced supports the shaft train.
  • a possible bearing offset between the machines is essentially compensated for by the intermediate shaft, in that it is bent accordingly.
  • the load on the bearings and the load on couplings in the shaft train can be limited to an appropriate level by a suitable choice of the bending stiffness.
  • the intermediate shaft can consist of a metal or a fiber-reinforced, in particular glass-fiber-reinforced, plastic.
  • each natural frequency that results in a bending vibration of the intermediate ridge wave belongs, significantly different from the nominal frequency or an integer multiple of the nominal frequency.
  • This configuration prevents the intermediate shaft, which may have been bent, from being excited into a bending vibration when the machine set is operated as intended.
  • the intermediate shaft is to be regarded as a damped resonator.
  • an excitation In order to excite the intermediate wave into a bending oscillation, an excitation therefore does not have to take place exactly with a natural frequency, but also an excitation with a frequency slightly different from a natural frequency can excite the intermediate wave into a forced bending oscillation. The extent to which this occurs a deviation from the natural frequency is possible is determined by corresponding parameters of the shaft train. "Substantially different" means that there is no significant excitation of a bending vibration with a corresponding excitation.
  • the bearings in the machine set of any configuration can be slide bearings or roller bearings, depending on the circumstances of the respective individual case, roller bearings in particular being considered as roller bearings.
  • the machine set of any configuration is designed in particular for exchanging the energy with a power between 25 megawatts and 250 megawatts, in particular of about 200 megawatts. This comes into consideration especially in the event that the machine is a free-running gas turbine and a generator.
  • Such a machine set forms, for example, an essential component of a gas turbine power plant or a combination power plant, in which an exhaust gas released from the gas turbine is fed to a steam boiler, where it is used to provide a high-tension steam to be relaxed in a correspondingly provided steam turbine.
  • 1, 2 and 3 show schematic drawings of exemplary embodiments for a machine set in the sense of the above embodiments; 4 shows a part of a longitudinal section through a gas turbine system with a turbine which is part of a corresponding machine set.
  • FIGS. 1, 2 and 3 Each of which shows a machine set with a first machine 1 in the form of a free-running gas turbine 1, a second machine 2, namely a generator 2, and a shaft train 3 , on which machines 1 and 2 are seated and, when rotating, machines 1 and 2 exchange energy between them.
  • the exchange of energy takes place in such a way that the free-running gas turbine 1 drives the generator 2 via the shaft train 3; the free-running gas turbine 1 converts thermodynamic energy into mechanical energy which flows along the shaft train 3 to the generator 2 and is converted there into electromagnetic energy.
  • the shaft train 3 is supported in three bearings 4 and 5, whereby a bearing 4 is arranged in the immediate vicinity of the first machine 1 and two bearings 4 and 5 are arranged in the immediate vicinity of the second machine 2.
  • the bearings 4, 5 comprise two radial bearings 4 for absorbing forces perpendicular to a longitudinal direction of the shaft train 3 and an axial bearing 5 for receiving an axial thrust communicated to the shaft train 3.
  • the thrust bearing 5 also has the same functions as a radial bearing 4.
  • the shaft train 3 is coupled together from an intermediate shaft 7 arranged between the machines 1, 2 and two other parts 6, each of which is a shaft crossing one of the machines 1 or 2.
  • the parts 6 and 7 are coupled together on respective couplings 9.
  • the arrangement of the single bearing 4 on the first machine 1 can also take into account the requirements of the respective individual case. According to FIG. 1, this bearing 4 is located on a side of the first machine 1 facing away from the intermediate shaft 7. According to FIG. 2, this bearing is located inside the first machine 1, and according to FIG side of the first machine 1.
  • the intermediate shaft 7 fulfills specific functions in each of the exemplary embodiments. First of all, by providing it, space can be created between the machines 1 and 2 in order to provide an exhaust gas routing system for discharging exhaust gas from the free-running gas turbine 1 in the vicinity of the shaft line 3. This is necessary in the sense of many known constructions, since gas turbines with a higher output in particular require an axial outflow of their exhaust gases. In the present context, it is also important that the intermediate shaft 7 can be designed in such a way that it is easily bendable and can essentially compensate for any misalignment between the different bearings 4 and 5 alone. For this purpose, the intermediate shaft 7 is designed with a comparatively low bending stiffness, measured on the bending stiffness of the other parts 6.
  • the intermediate shaft 7 It is also important to design the intermediate shaft 7 so that it does not tend to vibrate when the machine set is operated as intended; Such bending vibrations can occur in particular if the intermediate shaft 7 is slightly bent due to an offset between the bearings 4 and 5.
  • the intermediate shaft 7 is designed in such a way that any natural frequency which corresponds to a possible bending vibration of the intermediate shaft 7 is significantly different in the sense of the statements made earlier of a nominal frequency or a multiple of the nominal frequency with which the shaft train 3 at intended operation of the machine set rotates.
  • the load on the bearings 4 and 5 and the couplings 9 can also be set by selecting the bending stiffness and other parameters of the intermediate shaft 7, in particular their mass.
  • the intermediate shaft 7 and possibly the other parts 6 of the shaft train 3 in such a way that at least one of the couplings 9 even with a certain bending of the shaft train 3, which possibly already when the Shaft strand 3 is to be expected due to the distribution of the mass, is not loaded with torque or bending moments.
  • a careful selection of the material for the production of the intermediate shaft 7 can be important; not only common metals, but also plastics, in particular carbon or glass fiber reinforced plastics, come into consideration for this purpose.
  • FIG. 4 shows part of a longitudinal section through a gas turbine system which contains a free-running gas turbine 1 which belongs to a machine set of the type just explained.
  • a bearing 4 is provided in accordance with the exemplary embodiment according to FIG.
  • a shaft 6 in the interior of the free-running gas turbine 1 is formed from disks screwed together and arranged one behind the other.
  • the radial bearing 4 on the left side is assigned to this shaft 6.
  • REPLACEMENT BUTT (RULE 26) ken side of the free-running gas turbine 1 and a guide ring 8 on the right side of the free-running gas turbine 1, which guide ring 8 does not touch the shaft 6 during its intended operation, but leaves a small gap, not visible in Figure 4.
  • the shaft 6 should only touch the guide ring 8 if it is severely deformed, for example in the context of an accident. Such a fault can occur, for example, if there is a break in the free-running gas turbine 1.
  • the intermediate shaft 7 is coupled to the shaft 6 at a clutch 9.
  • a common bearing housing 10 is provided for mounting both gas turbines 1 and 11. Both gas turbines 1 and 11 are also surrounded by a common turbine housing 12.
  • the invention provides a machine set with two machines 1 and 2 coupled via a shaft train 3, which is particularly simple and therefore inexpensive in view of the necessary mounting of the shaft train 3.
  • FIG. 1 A first figure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Support Of The Bearing (AREA)
  • Sliding-Contact Bearings (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

L'invention concerne un ensemble de machines comprenant une ligne d'arbres (3), deux machines (1, 2) montées sur celle-ci et échangeant entre elles de l'énergie par rotation de ladite ligne d'arbres (3), ainsi qu'une pluralité de paliers (4, 5) supportant la ligne d'arbres (3). Cet ensemble de machines est équipé seulement de trois paliers (4, 5). La première machine est en particulier une turbine à gaz montée folle (1), et la deuxième machine est en particulier un générateur (2).
EP96946245A 1996-01-08 1996-12-20 Systeme de paliers pour ensemble de turbomachines Withdrawn EP0873467A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19600419 1996-01-08
DE1996100419 DE19600419A1 (de) 1996-01-08 1996-01-08 Maschinensatz
PCT/DE1996/002491 WO1997025523A2 (fr) 1996-01-08 1996-12-20 Systeme de paliers pour ensemble de turbomachines

Publications (1)

Publication Number Publication Date
EP0873467A2 true EP0873467A2 (fr) 1998-10-28

Family

ID=7782300

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96946245A Withdrawn EP0873467A2 (fr) 1996-01-08 1996-12-20 Systeme de paliers pour ensemble de turbomachines

Country Status (4)

Country Link
EP (1) EP0873467A2 (fr)
JP (1) JP2000502776A (fr)
DE (1) DE19600419A1 (fr)
WO (1) WO1997025523A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6826914B2 (en) 2001-08-17 2004-12-07 Alstom Technology Ltd Turbogroup of a power generating plant
US6708500B2 (en) 2001-08-17 2004-03-23 Alstom Technology Ltd Turbogroup of a power generating plant
JP3943013B2 (ja) * 2002-12-26 2007-07-11 株式会社竹中工務店 縦型火力発電プラント
JP5010499B2 (ja) 2008-02-28 2012-08-29 三菱重工業株式会社 ガスタービン及びガスタービンの保守点検方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE394589C (de) * 1923-05-27 1924-04-23 Aeg Dampfturbinenanlage zum Antrieb von elektrischen Generatoren
GB361305A (fr) * 1929-05-16 1931-11-16 Siemens-Schuckertwerke Aktiengesellschaft
DE726983C (de) * 1937-11-19 1942-10-23 Ljungstroms Angturbin Ab Turbogenerator
CH214978A (de) * 1940-09-12 1941-05-31 Oerlikon Maschf Gasturbinenanlage.
EP0302508B1 (fr) * 1987-08-06 1990-10-24 Mtu Motoren- Und Turbinen-Union MàœNchen Gmbh Centrale de délivrance d'énergie
US5083040A (en) * 1990-06-07 1992-01-21 General Electric Company Integrated turbine generator
DE4120665A1 (de) * 1991-06-22 1992-12-24 Teves Gmbh Alfred Elektromotorisch angetriebene hydraulikpumpe
US5201796A (en) * 1991-10-15 1993-04-13 United Technologies Corporation Gas turbine engine arrangement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9725523A3 *

Also Published As

Publication number Publication date
WO1997025523A2 (fr) 1997-07-17
JP2000502776A (ja) 2000-03-07
WO1997025523A3 (fr) 1997-08-28
DE19600419A1 (de) 1997-07-10

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