EP3128135A1 - Conception de turbine dans une zone d'entrée de surcharge - Google Patents

Conception de turbine dans une zone d'entrée de surcharge Download PDF

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Publication number
EP3128135A1
EP3128135A1 EP15180044.8A EP15180044A EP3128135A1 EP 3128135 A1 EP3128135 A1 EP 3128135A1 EP 15180044 A EP15180044 A EP 15180044A EP 3128135 A1 EP3128135 A1 EP 3128135A1
Authority
EP
European Patent Office
Prior art keywords
overload
steam
rotor
shroud
inflow region
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Withdrawn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
EP15180044.8A
Other languages
German (de)
English (en)
Inventor
Stefan Brück
Armin De Lazzer
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 EP15180044.8A priority Critical patent/EP3128135A1/fr
Priority to PCT/EP2016/065141 priority patent/WO2017021067A1/fr
Publication of EP3128135A1 publication Critical patent/EP3128135A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/06—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-inlet-pressure type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type

Definitions

  • the invention relates to a turbomachine, in particular steam turbine, comprising an inflow region, a rotatably mounted rotor, a housing which is arranged around the rotor, wherein between the rotor and the housing, a flow channel is formed, flows through the flow during operation, a flow medium in a flow direction wherein the rotor includes rotor blades and the housing includes vanes, the turbomachine comprising an inflow region, the housing having an additional overload inflow region disposed downstream of the inflow region and for flowing overload vapor into the flow channel, the vanes having shrouds ,
  • the invention relates to a method for preventing thermal overload in the overload inflow region of a turbomachine.
  • Modern power plants are equipped with turbomachines, such as Operated steam turbines, which must meet special requirements. Since the operation of fossil power plants requires increasing overload capacity, a flexibilization of such power plants is required.
  • a power plant usually has a steam generator or a steam boiler. As a rule, the power plant operators demand that the pressure in the boiler in overload operation does not rise or only slightly increases. This allows the boiler to be designed cost-effectively to the pressure required in nominal operation. In a pure Gleit horrigesky Agriculture the steam boiler, a correspondingly high boiler pressure would be required.
  • control stage which is operated in nominal operation with one or more closed nozzle groups. In an overload operation these become Valves open, allowing more mass flow can be enforced without the boiler pressure must be increased.
  • the disadvantage here is that the control stage is structurally complex and thus represents a cost-intensive factor.
  • the aforementioned solution has an unfavorable efficiency.
  • this solution requires a complex valve control with many individual valves.
  • a common approach is to use a so-called overload introduction. This means that additional steam is supplied within the blade path via a valve closed in nominal operation. As a result, the steam mass flow is increased only from one stage of the blade path. This is also referred to as the step lockup.
  • the boiler pressure can thus be kept constant.
  • the thermal load on the shaft can be adversely affected by further effects. If z. B. the introduction of steam through radial holes constructively realized, the thermal load is also increased.
  • the supplied overload steam is injected radially inwardly into the main flow through the radial bores.
  • the overload steam has a higher temperature than that coming from the entrance of the turbine Steam of the mainstream.
  • the steam does not mix immediately with the vapor of the overload steam inflow but penetrates radially the entire flow path and impinges on the shaft surface.
  • a very high heat transfer coefficient between wave and Zudampf is achieved.
  • the wave in the area of overload introduction e.g. specially designed by relief grooves to thereby mitigate the thermal stresses in the shaft.
  • the invention has set itself the task of enabling a more flexible operation of a turbomachine in particular steam turbine.
  • the invention is not limited to overload inflow areas, but can at any point in the turbomachine be used, not only with the aim of overload operation.
  • a turbomachine in particular a steam turbine, comprising an inflow region, a rotatably mounted rotor, a housing which is arranged around the rotor, wherein between the rotor and the housing a flow channel is formed, through which in operation a flow medium in one Flow direction, wherein the rotor blades and the housing includes vanes, wherein the turbomachine has an inflow region, wherein the housing has an additional Matterlasteinström Suite, which is arranged in the flow direction downstream of the inflow and is formed for the inflow of overload steam in the flow channel, wherein the guide vanes Having shrouds, which is prevented in operation of the overload steam by the shrouds on Aufteffen on the rotor in Matterlasteinström Symposium.
  • the shroud is arranged on the vane tip.
  • the shroud is formed substantially to the rotor surface, which leads to a better aerodynamic effect, since the steam from the main flow and the steam from the overload device can be optimally guided by the shroud.
  • the shroud is formed from the vane tip to the adjacent blade.
  • the shroud is formed of the same material with the guide vane. This allows a more stable construction.
  • the entire stator blade ring as an integral component, for. B. in the form of two half-rings.
  • a more stable construction is possible, which is also thermally decoupled from the housing, for example, is mounted thermally movable, can be performed.
  • a labyrinth seal is arranged between the shroud and the rotor surface. This has the advantage that a steam that passes between the shroud and the shaft surface, is slowed down, because such a vapor is usually a loss of steam and has a negative impact on the efficiency.
  • the object is achieved by a method for preventing a thermal overload in Studentslasteinström Scheme a turbomachine, in particular steam turbine, wherein the flowing into the Studentslasteinström Scheme overload steam is prevented by a arranged at the top of the vane shroud on hitting the rotor surface in Studentslasteinström Scheme.
  • the FIG. 1 shows a schematic representation of a power plant comprising a steam turbine 2, which is formed from a high-pressure turbine section 2a, a medium-pressure turbine section 2b, and a low-pressure turbine section 2c. Furthermore, the power plant 1 comprises a steam generator 3. In the steam generator 3 steam is generated, which is generated by the use of fossil fuels. The steam generated in the steam generator flows via a main steam line 4 via a main steam valve 5 into an inflow region 6 of the high-pressure partial turbine 2a. The steam then flows into a flow channel (in FIG. 1 not shown) through the high-pressure turbine section and flows at the outlet 7 of the high-pressure turbine section 2a in a cold reheater line 8.
  • the steam flows to a reheater 9 and is brought there to a higher temperature.
  • the steam flows via a hot reheater line 10 to the inflow region 11 of the medium-pressure turbine section 2b.
  • the steam flows via the medium-pressure outlet 12 into an overflow line 13 to the low-pressure turbine section 2c.
  • the steam flows via the outlet 14 of the low-pressure turbine section 2c to a condenser 15 and condenses there again to water.
  • the water is returned via the pump 16 to the steam generator 3 and converted there back into steam.
  • the high-pressure part-turbine 2a has an overload inflow region 17.
  • This Documentlasteinström Scheme 17 is fluidly connected to an overload valve 18.
  • the overload valve 18 is fluidically connected to an overload line 19.
  • the main steam line 4 has a branch 20, wherein a portion of the steam in the main steam line 4 is deflected to the inflow region 6 and a further part is deflected into the overload line 19.
  • FIG. 2 shows a schematic representation of a part of a steam turbine according to the prior art.
  • Steam turbine shown has a rotor 21 which is rotatably disposed about a rotation axis 22.
  • blades 25 are arranged in so-called blade grooves.
  • the blades 25 have blade feet 26 disposed in the blade grooves 24.
  • a housing here an inner housing 27 is arranged. Between the inner housing 27 and the rotor 21, a flow channel 28 is formed. In operation, a vapor flows in a flow direction 29 along the flow channel 28. On the inner housing 27 so-called vanes 30 are arranged. The guide vanes 30 have guide blade feet 31 which are arranged in blade grooves in the inner housing 27. The flow channel 28 leads along a blade path formed between the vanes 30 and blades 25.
  • the inflow area is in the FIG. 2 not shown in detail, in certain operating cases, it is necessary to divide the steam, which is then passed over the main steam line 4 to the overload line 19 and from there into a Kochlasteinström Society 17 is performed.
  • the overload steam comes from the overload line 19 in the flow channel 28.
  • the overload steam 32 flows more or less in a radial direction 33 in the direction of Rotor surface 23.
  • the rotor surface 23 is thermally heavily loaded. It is therefore common in the prior art, in the region of the inflow region 17, which is characterized by a distance between a first blade 34 and a second blade 35 to arrange relief grooves 36.
  • FIG. 3 shows an inventive arrangement of the inflow 6 of the steam turbine. 2
  • the difference of the inflow area 6 as in the FIG. 3 is shown, with respect to the inflow 6 as in the FIG. 2 is shown, is that in operation, the overload steam 32 is prevented by a shroud 37, which is arranged on the vane tip 38, from hitting the rotor 21.
  • the hot overload steam 32 thus no longer impinges directly on the rotor surface 23, but is prevented by the shroud 37 therefrom.
  • the shroud 37 protrudes from the vane tip 38 to the next blade 34.
  • the first blade 34 is disposed adjacent to the vane 30.
  • the shroud is formed of the same material with the guide vane 30.
  • the shroud 37 is integrally connected to the guide vane 30.
  • the Studentslasteinström Society 17 is arranged downstream of the inflow 6 in the flow direction.
  • the turbomachine according to FIG. 3 is used to prevent thermal overload in Studentslasteinström Scheme 17 a turbomachine, in particular steam turbine, wherein the overloading steam 32 flowing in the overload inflow region 17 is prevented from impinging on the rotor surface 23 in the overload inflow region 17 at the tip of the guide vane 38.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP15180044.8A 2015-08-06 2015-08-06 Conception de turbine dans une zone d'entrée de surcharge Withdrawn EP3128135A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15180044.8A EP3128135A1 (fr) 2015-08-06 2015-08-06 Conception de turbine dans une zone d'entrée de surcharge
PCT/EP2016/065141 WO2017021067A1 (fr) 2015-08-06 2016-06-29 Conception de turbine dans une zone d'admission de surcharge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15180044.8A EP3128135A1 (fr) 2015-08-06 2015-08-06 Conception de turbine dans une zone d'entrée de surcharge

Publications (1)

Publication Number Publication Date
EP3128135A1 true EP3128135A1 (fr) 2017-02-08

Family

ID=53785540

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15180044.8A Withdrawn EP3128135A1 (fr) 2015-08-06 2015-08-06 Conception de turbine dans une zone d'entrée de surcharge

Country Status (2)

Country Link
EP (1) EP3128135A1 (fr)
WO (1) WO2017021067A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5841205A (ja) * 1981-09-04 1983-03-10 Hitachi Ltd 混圧蒸気タ−ビン
JPS58197401A (ja) * 1982-05-14 1983-11-17 Toshiba Corp 地熱タ−ビン
US20090226311A1 (en) * 2008-03-10 2009-09-10 General Electric Company Interface member for a power plant
EP2546476A1 (fr) * 2011-07-14 2013-01-16 Siemens Aktiengesellschaft Installation de turbines à vapeur et procédé pour opérer l'installation de turbines à vapeur
EP2667027A1 (fr) * 2012-05-24 2013-11-27 Alstom Technology Ltd Installation solaire à cycle de Rankine à vapeur et procédé de fonctionnement de ladite installation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003106170A (ja) * 2001-10-01 2003-04-09 Mitsubishi Heavy Ind Ltd ガスタービンおよびガスタービン複合プラント、並びに冷却蒸気圧力調整方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5841205A (ja) * 1981-09-04 1983-03-10 Hitachi Ltd 混圧蒸気タ−ビン
JPS58197401A (ja) * 1982-05-14 1983-11-17 Toshiba Corp 地熱タ−ビン
US20090226311A1 (en) * 2008-03-10 2009-09-10 General Electric Company Interface member for a power plant
EP2546476A1 (fr) * 2011-07-14 2013-01-16 Siemens Aktiengesellschaft Installation de turbines à vapeur et procédé pour opérer l'installation de turbines à vapeur
EP2667027A1 (fr) * 2012-05-24 2013-11-27 Alstom Technology Ltd Installation solaire à cycle de Rankine à vapeur et procédé de fonctionnement de ladite installation

Also Published As

Publication number Publication date
WO2017021067A1 (fr) 2017-02-09

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