EP3294996B1 - Turbomaschine mit magnetlagerung - Google Patents

Turbomaschine mit magnetlagerung Download PDF

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Publication number
EP3294996B1
EP3294996B1 EP16733470.5A EP16733470A EP3294996B1 EP 3294996 B1 EP3294996 B1 EP 3294996B1 EP 16733470 A EP16733470 A EP 16733470A EP 3294996 B1 EP3294996 B1 EP 3294996B1
Authority
EP
European Patent Office
Prior art keywords
cooling
air
magnetic bearing
cooling system
turbomachine
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.)
Not-in-force
Application number
EP16733470.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3294996A1 (de
Inventor
Christoph Grund
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
Priority to PL16733470T priority Critical patent/PL3294996T3/pl
Publication of EP3294996A1 publication Critical patent/EP3294996A1/de
Application granted granted Critical
Publication of EP3294996B1 publication Critical patent/EP3294996B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
    • 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
    • F05D2240/00—Components
    • F05D2240/50—Bearings
    • F05D2240/51—Magnetic
    • F05D2240/515—Electromagnetic

Definitions

  • the invention relates to a turbomachine, in particular a steam turbine according to the preamble of independent claim 1. Furthermore, the invention relates to a method for operating such a turbomachine.
  • a turbomachine according to the invention with a magnetic bearing arrangement is for example from DE 10 2011 005 347 A1 known.
  • the main advantage of magnetic bearings lies in the non-contact and thus largely frictionless mounting of the rotor.
  • the magnetic bearing allows oil-free storage of the shaft.
  • the oil-free storage offers particular advantages in steam turbines, because this can ensure that no oil enters the steam cycle of the steam turbine.
  • the risk of fire in turbomachinery is generally significantly reduced by the oil-free storage.
  • Magnetic bearings Active magnetic bearings, hereinafter referred to only as magnetic bearings, heat up due to design due to eddy current losses.
  • Fluid-loaded rotors are used, for example, in steam turbines. The rotor comes into contact with hot steam and warms up due to this. As a result of heat conduction, the heat reaches the magnetic bearing.
  • Magnetic bearings must therefore always be cooled in order to avoid unacceptably high temperatures.
  • the cooling of the magnetic bearing is usually carried out by cooling air, which is passed through the gap between the stator and the rotor of the magnetic bearing.
  • the object is achieved with respect to the turbomachine according to the features of independent claim 1.
  • the object is achieved according to the features of the independent claim 7.
  • the turbomachine according to the invention comprising a rotor which is mounted on at least one shaft end with an active magnetic bearing, wherein the rotor has a fluidbeaufschlagten area and between the fluidbeaufschlagten area and the magnetic bearing at least one cooling fin is arranged on the rotor, and wherein the magnetic bearing and the Cooling plate are cooled by air, characterized in that two separate cooling systems are provided, of which the first cooling system provides air for cooling the magnetic bearing and wherein the second cooling system provides air for cooling the cooling fins.
  • the cooling of the rotor or the cooling fins can be controlled independently of the cooling of the magnetic bearing and thus each needs.
  • An advantageous embodiment of the invention provides that the first cooling system provides air with a higher air purity than the second cooling system, which serves to cool the cooling fin.
  • the cooling fin no cooling air with particularly high air quality is needed, so that this normal ambient air is usually sufficient.
  • a special treatment of the cooling air for cooling the cooling fins is not necessary. Only the cooling air, which is provided by the first cooling system and used to cool the magnetic bearing is specially prepared, in particular cleaned and optionally dried. Because of this, only a significantly smaller amount of air must be supplied to the complex air treatment process. As a result, significant costs for the air treatment can be saved.
  • a further embodiment of the invention provides that the first cooling system has at least one fan / fan, and a filter for filtering the air provided for cooling the magnetic bearing.
  • the air mass flow can be regulated as needed. The higher the temperature of the bearing, the larger must be the supplied cooling mass flow to dissipate the amount of heat.
  • the purpose of the air filter is to purify the air and to filter particulate matter from air in particular so that it can not get into the magnetic bearing and subsequently damage it.
  • Another embodiment of the invention provides to form the first cooling system as a redundant cooling system.
  • Redundant here means that the cooling system has a second parallel branch by another fan and another filter for filtering the provided for cooling the magnetic bearing Air has. In the event of damage or service, this ensures that sufficient cooling of the magnetic bearing is always guaranteed. In particular, a shutdown of the turbine due to a failure of the cooling system or a service of the cooling system is not necessary. The reliability of the turbomachine is thus significantly increased by the redundant system.
  • a further embodiment of the invention provides that the second cooling system has at least one fan.
  • the blower By the blower, the supplied air mass flow and thus the possible dissipated heat can be controlled as needed. As a result, only the actually required mass of air is always led to the cooling fin, which in turn can be saved energy costs.
  • a further embodiment of the invention provides that the second cooling system is constructed as a redundant cooling system. This in turn ensures that it is always guaranteed in case of failure of the cooling system or maintenance, that a sufficient cooling mass flow reaches the cooling fin and so the cooling fin and thus the rotor is sufficiently cooled. As a result, in turn, the reliability of the turbomachine is significantly increased.
  • an additional air filter may be provided in the second cooling system.
  • Such an air filter would be recommended, for example, for use in desert areas, as filtered by the air filter sand, which is located in the ambient air, and thus kept away from the rotor.
  • cooling air is only provided if it is necessary for cooling the magnetic bearing. As a result, no conditioned cooling air must be directed to the bearing, if this does not even demand the temperature of the magnetic bearing. On the other hand, this can be dispensed with the drying of the cooling air, since the moisture can not be reflected in the camp, since the camp already has a sufficiently high temperature. The complex drying of the cooling air can thus be omitted.
  • FIG. 1 shows a schematic view of a turbomachine according to the invention.
  • the turbomachine 1 comprises a rotor 2 on which at least one turbine stage 12 is arranged.
  • the rotor 2 is mounted at its shaft ends 3 with magnetic bearings 4.
  • the magnetic bearings 4 are designed as radial bearings.
  • a thrust bearing 13 is provided, which can also be designed as a magnetic bearing or as a conventional bearing.
  • cooling fins 6 are arranged on the rotor.
  • the cooling fins 6 can for example be shrunk on the rotor, grown or made in one piece with the rotor 2. Both the magnetic bearings 4 and the cooling fins 6 are cooled by means of air.
  • the first cooling system 7 provides air for cooling the magnetic bearing 4 ready.
  • the second cooling system 8 provides air for cooling the cooling fins 6.
  • the air of the first cooling system 7 has a higher air purity than the air provided by the second cooling system 8. This is necessary because the magnetic bearings 4 are very sensitive to moisture and dirt.
  • the air sucked in by the blowers 9 is cleaned by means of a filter 10. As a result, any solids contained in the air are separated. Subsequently, the thus treated air is supplied to the magnetic bearings 4.
  • the cooling air is passed through the gap 14 between the stator 15 and the rotor 16 of the magnetic bearing 4 and thereby cools the magnetic bearing 4.
  • the first cooling system 7 is designed as a redundant cooling system, while in a parallel branch, a second fan 9 and a second filter 10 is provided for filtering the air provided for cooling the magnetic bearing 4.
  • the redundant system significantly increases the reliability of the turbomachine and significantly reduces downtime due to repairs or maintenance.
  • the second cooling system 8 is designed as a redundant system.
  • the fans 9, 11 of the first and the second cooling system 7, 8 are preferably switched as needed. That is, it is only cooling air supplied to the magnetic bearing 4 and to the cooling fins 6, if this is necessary for thermal reasons. This can save considerable energy costs for operating the blower.
  • the inventive method for operating the turbomachine provides that permanently the temperature of the magnetic bearing 4 is measured and compared with a predetermined temperature T soll . Only when the predetermined temperature T soll is exceeded is cooling air provided by the first cooling system 7. Since at this time the magnetic bearing 4 already has a corresponding temperature, can be dispensed with the complex drying of the air, since a precipitation of moisture from the air due to the high temperature of the magnetic bearing 4 can be excluded. As a result, the operating costs are further reduced because the air drying is associated with significant energy costs. When it falls below the predetermined temperature T to an interruption of the supply of cooling air through the first cooling system 7. A further cooling after falling below the temperature T is not necessary from a thermal viewpoint. This also ensures that moisture from the cooling air can not be reflected on the magnetic bearing 4 and there ensures damage to the magnetic bearing 4.
  • FIG. 2 shows a detail view of in FIG. 1 illustrated turbomachine 1.
  • the right end of the shaft 3 of the rotor 2 is shown in the detailed view.
  • the FIG. 2 clarifies again, the two separate cooling systems 7, 8, wherein the first cooling system 7, the air for cooling the magnetic bearing 4 provides and wherein the second cooling system 8, the air for cooling the cooling fins 6 provides.
  • three cooling fins are provided for cooling the rotor, which are shrunk onto the rotor 2.
  • the cooling air which is provided by the first cooling system 7, passes through a separate supply line to the magnetic bearing 4 and then flows through the bearing gap 14 between the stator 15 and the rotor 16 of the magnetic bearing 4.
  • the cooling air takes on a corresponding amount of heat and thereby cools the Magnetic bearing 4.
  • the FIG. 2 in each case only one fan for each separate cooling systems 7, 8 is shown.
  • the provision of redundant cooling systems is particularly advantageous in order to increase operational safety.
  • the provision of two separate cooling systems of which the first cooling system for cooling the magnetic bearing and the second cooling system for cooling the cooling fins are used, can save considerable energy costs.
  • the expensive preparation of the cooling air for cooling the magnetic bearings is reduced to a minimum.
  • the cooling of the cooling fins is done with largely unpurified air, which can be removed from the environment. Due to the design as redundant cooling systems, the operational reliability of the turbomachine is significantly increased.
  • the inventive method for operating the turbomachine can be dispensed with in addition to the drying of the cooling air for cooling the magnetic bearings, which additional energy costs can be saved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP16733470.5A 2015-09-25 2016-06-28 Turbomaschine mit magnetlagerung Not-in-force EP3294996B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16733470T PL3294996T3 (pl) 2015-09-25 2016-06-28 Turbozespół z ułożyskowaniem magnetycznym

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015218492.7A DE102015218492A1 (de) 2015-09-25 2015-09-25 Turbomaschine mit Magnetlagerung
PCT/EP2016/064961 WO2017050445A1 (de) 2015-09-25 2016-06-28 Turbomaschine mit magnetlagerung

Publications (2)

Publication Number Publication Date
EP3294996A1 EP3294996A1 (de) 2018-03-21
EP3294996B1 true EP3294996B1 (de) 2019-04-17

Family

ID=56292703

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16733470.5A Not-in-force EP3294996B1 (de) 2015-09-25 2016-06-28 Turbomaschine mit magnetlagerung

Country Status (4)

Country Link
EP (1) EP3294996B1 (pl)
DE (1) DE102015218492A1 (pl)
PL (1) PL3294996T3 (pl)
WO (1) WO2017050445A1 (pl)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017207676A1 (de) * 2017-05-08 2018-11-08 Siemens Aktiengesellschaft Lageranordnung zur Lagerung eines Turbinenrotors einer Turbomaschine
IT201700097796A1 (it) * 2017-08-31 2019-03-03 Nuovo Pignone Tecnologie Srl Sistemi di turbomacchine con refrigerazione di cuscini magnetici attivi e metodo
IT202100026741A1 (it) 2021-10-19 2023-04-19 Nuovo Pignone Tecnologie Srl Circuito ad anello chiuso per fluido di raffreddamento di un cuscino magnetico per un sistema espantore-compressore
IT202100026729A1 (it) 2021-10-19 2023-04-19 Nuovo Pignone Tecnologie Srl Cuscino magnetico reggi-spinta con effetto pompante

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008045654A1 (de) 2008-09-03 2010-03-11 Siemens Aktiengesellschaft Dampfturbine mit Magnetlagerkühlung
EP2169185B1 (de) * 2008-09-25 2012-05-30 Siemens Aktiengesellschaft Dampfturbine
DE102011005347B4 (de) 2011-03-10 2013-11-07 Siemens Aktiengesellschaft Turbine mit einem Magnetlager und Verfahren zum Betreiben der Turbine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3294996A1 (de) 2018-03-21
PL3294996T3 (pl) 2019-10-31
DE102015218492A1 (de) 2017-03-30
WO2017050445A1 (de) 2017-03-30

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