EP2952700A1 - Agencement de boîtier intérieur pour une turbomachine et procédé associé de manufacture - Google Patents

Agencement de boîtier intérieur pour une turbomachine et procédé associé de manufacture Download PDF

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Publication number
EP2952700A1
EP2952700A1 EP14170959.2A EP14170959A EP2952700A1 EP 2952700 A1 EP2952700 A1 EP 2952700A1 EP 14170959 A EP14170959 A EP 14170959A EP 2952700 A1 EP2952700 A1 EP 2952700A1
Authority
EP
European Patent Office
Prior art keywords
drainage
inner housing
housing construction
drainage screen
collecting slot
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Withdrawn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
EP14170959.2A
Other languages
German (de)
English (en)
Inventor
Stefan Bentele
Patrick Bison
Holger Frank
Martin Peterson
Sebastian Thiemann
Lucia Dr. Tosal-Martinez
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 EP14170959.2A priority Critical patent/EP2952700A1/fr
Priority to PCT/EP2015/059285 priority patent/WO2015185294A1/fr
Publication of EP2952700A1 publication Critical patent/EP2952700A1/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Withdrawn legal-status Critical Current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
    • 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
    • F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/10—Manufacture by removing material

Definitions

  • the invention relates to an inner casing construction for a turbomachine, in particular a steam turbine, comprising a drainage device, wherein the drainage device comprises a collecting slot.
  • the invention relates to a method for producing an inner housing construction with a dewatering device, wherein in the inner housing construction, a collecting slot is incorporated.
  • turbomachines such as steam turbines
  • thermal energy of a water vapor is converted into rotational energy of a rotor.
  • a steam turbine is usually divided into several sub-turbines, such as a high-pressure, medium-pressure and low-pressure turbine part.
  • the steam parameters of the incoming steam into each turbine are different, with temperatures and pressures in the low pressure turbine being lowest.
  • the flow and steam parameter ratios in the low pressure turbine part are such that mist droplets are formed, also referred to as primary droplets, that are very small.
  • Such primary droplets have hardly any diameter of more than 0.2 .mu.m in a further expansion in a progressive condensation.
  • the primary and secondary drops lead to further losses in a steam turbine such. Drag loss, brake loss, centrifugation loss and volume loss.
  • the presence of the primary and secondary drops has the disadvantage that a material wear can take place in the form of drop impact erosion. This means that when a secondary drop hits a blade, it can cause a material removal, namely when the droplets have diameters in the order of 50-400 ⁇ m. Much smaller drops are harmless and larger ones do not occur.
  • a common and known countermeasure is also to excrete a part of the water by centrifugal action and to remove it from the flow path. This is done using a ring slot on the circumference, which receives the centrifugal force carried to the outside drops. Such a drainage slot is incorporated in the outer channel boundary.
  • the slots are usually in the wake of the blades, so they capture the thrown by these water. When sizing the slots, it must be remembered that the dimensions are not too large, so that the losses are kept as small as possible.
  • a steam turbine generally comprises a rotatably mounted rotor and an inner housing arranged around the rotor.
  • the inner pressure housing is formed as an inner housing construction and comprises in some parts a thickness of several centimeters. With such a thickness, it is a challenge to form a drainage slot having, for example, a width of 2 mm.
  • the invention seeks to remedy this situation.
  • the object of the invention is to form an inner housing construction with a comparatively large thickness in a simple manner with a drainage slot.
  • an inner casing construction for a turbomachine in particular a steam turbine, comprising a drainage device, wherein the drainage device comprises a collecting slot, wherein a drainage orifice is arranged in front of the collecting slot, wherein the drainage orifice comprises drainage slots.
  • an inner housing construction with a dewatering device, wherein in the inner housing construction, a collecting slot is incorporated, wherein before the collecting slot a drainage aperture is arranged and arranged in the drainage dewatering slots.
  • An inner shell construction may be, for example, a vane ring.
  • the way is thus taken to first form a drainage device in the inner housing construction, in the form of a collecting slot.
  • the inner housing construction is formed with a circumferentially arranged collecting slot, which can be formed with conventional machining methods such as milling.
  • the dimensioning of the collecting slot is such that a production by simple means is possible.
  • a separate thin sheet metal strip is now used, which is arranged as a drainage aperture in front of the collecting slot, wherein in the drainage aperture drainage slots are arranged, the z. B. can be introduced by conventional manufacturing processes such as water jet cutting.
  • Such a drainage slot has, for example, a width of about 1 mm to 2 mm.
  • the inner housing construction is provided with a groove arranged in front of the collecting slot, wherein the drainage aperture is arranged in the groove. Slippage during operation of the dewatering diaphragm is thus effectively avoided.
  • the drainage screen is fitted in a groove to the left of the collection slot and to the right of the collection slot.
  • the thickness of the drainage aperture and the depth of the groove is selected such that the surface of the inner housing construction is continuously formed.
  • the groove has approximately a depth that corresponds to the height of the drainage iris.
  • the surface of the inner housing construction is flat and has no disturbing stage, which leads to changed flow profiles.
  • the inner housing construction is formed substantially rotationally symmetrical to a rotation axis.
  • the collecting slot is in this case formed by means of bores or oblong holes and is essentially an annular gap circulating about an axis of rotation.
  • the inner housing construction has a row of guide vanes, the dewatering device generally being arranged in front of the row of guide vanes.
  • the method according to the invention is characterized inter alia by the fact that the drainage screen is welded into the groove. Furthermore, the method is advantageously further developed in that the drainage slots are produced by water jet cutting.
  • the FIG. 1 shows a part of an inner housing construction 1, which is rotationally symmetrical about a rotation axis 2 is formed.
  • the inner housing construction may be, for example, a vane ring.
  • a rotor 3 is rotatably mounted about the axis of rotation 2 and comprises at least one row of blades 4 (further rows of blades are not shown).
  • a guide blade row 6 is arranged rotationally symmetrically about the rotation axis 2.
  • a further row of guide blades 7 is arranged rotationally symmetrically about the axis of rotation 2.
  • the inner housing construction 1 is intended for use in a turbomachine, for example a steam turbine.
  • the inner housing construction 1 essentially comprises a load-bearing component of a material which has a comparatively large thickness 14. At least the thickness 14 is such that water jet cutting is not possible to incorporate a gap of comparatively small size.
  • the inner casing structure 1 comprises a dewatering device 8, wherein the dewatering device 8 has a collecting slot 9.
  • a hot vapor flows in the flow direction 5 and can lead to a condensation of small droplets on the blade row 4, which can impinge by centrifugal forces on an inner surface 10 of the inner housing structure 1.
  • the dewatering device 8 is provided, which can aspirate the drops 10 striking the surface.
  • the collecting slot 9 is introduced by conventional methods and has a large width 16, 18 corresponding to a method.
  • a drainage screen 11 is arranged, wherein the drainage screen 11 has drainage slots 12 with the width 16 (in FIG FIG. 1 not shown in detail).
  • the drainage screen 11 is arranged in a groove 13 in the inner housing structure 1.
  • the drainage screen 11 consists of a thin sheet, the drainage slots 12 are made by water jet cutting. Alternatively, other manufacturing methods can be used.
  • the thickness 14 of the drainage screen 11 and the depth 15 of the groove 13 are chosen such that the surface 10 of the inner housing structure is continuously formed.
  • the drainage screen 11 is welded by a welding process in the groove 13.
  • the width 16, 18 of the drainage slots 12 is in this case between 1 and 2 mm.
  • the collecting slot 9 is formed as an annular gap and is connected by bores or slots with a pressure chamber of lower pressure.
  • steam located in front of the dewatering screen 11 is drawn in toward the inner housing structure 1.
  • Via further lines of the steam passes to a drainage unit (not shown).
  • the inner casing construction 1 and the drainage screen 11 may be made of a same material.
  • the drainage screen 11 may comprise a different material than the inner housing construction 1.
  • the material of the drainage screen 11 may be a high alloy steel.
  • FIG. 2 shows a part of the inner housing construction 1. To see is a part of the drainage screen 11, which is formed circumferentially in a circumferential direction 17.
  • FIG. 3 shows an enlarged cross-sectional view of the Enticassungsvorraum 8.
  • the collecting slot 9 has a width 18.
  • the groove 13 which is in in FIG. 3 illustrated example, two stages, which means that basically a second groove 13a is arranged.
  • the drainage screen 11 is arranged in the second groove 13 a.
  • the drainage screen 11 is welded into the groove 13a.
  • FIG. 4 shows a side view of the drainage screen 11.
  • the drainage screen 11 has a plurality of arranged in the circumferential direction 17 drainage slots 12.
  • the drainage slots 12 have a width 16, 18 between 1 mm and 2 mm and are arranged to ensure a circumferentially same effect ideally offset from each other.
  • Seen in the circumferential direction 17, the drainage slots 12 are in arranged at an equal distance 21.
  • the second row in the circumferential direction 17 of the drainage slots 12 each have been selected an equal distance 21.
  • FIG. 5 shows a cross-sectional view of in FIG. 4 shown drainage aperture 11.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP14170959.2A 2014-06-03 2014-06-03 Agencement de boîtier intérieur pour une turbomachine et procédé associé de manufacture Withdrawn EP2952700A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14170959.2A EP2952700A1 (fr) 2014-06-03 2014-06-03 Agencement de boîtier intérieur pour une turbomachine et procédé associé de manufacture
PCT/EP2015/059285 WO2015185294A1 (fr) 2014-06-03 2015-04-29 Structure de boîtier intérieur pour turbomachine et son procédé de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14170959.2A EP2952700A1 (fr) 2014-06-03 2014-06-03 Agencement de boîtier intérieur pour une turbomachine et procédé associé de manufacture

Publications (1)

Publication Number Publication Date
EP2952700A1 true EP2952700A1 (fr) 2015-12-09

Family

ID=50884731

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14170959.2A Withdrawn EP2952700A1 (fr) 2014-06-03 2014-06-03 Agencement de boîtier intérieur pour une turbomachine et procédé associé de manufacture

Country Status (2)

Country Link
EP (1) EP2952700A1 (fr)
WO (1) WO2015185294A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB388156A (en) * 1930-12-13 1933-02-23 Asea Ab Improvements in means for draining off moisture from the steam in steam turbines
DE2038047A1 (de) * 1970-07-31 1972-02-03 Maschf Augsburg Nuernberg Ag Entwässerung der Oberflachen der Leitschaufeln und des Stromungsraumes von Dampfturbinen, insbesondere Satt und Naßdampfturbinen
CA1006448A (en) * 1971-09-09 1977-03-08 Ukrainsky Nauchno-Issledovatelsky Institut Prirodnykh Gazov Turboexpander
GB1484289A (en) * 1975-09-26 1977-09-01 English Electric Co Ltd Steam turbines
DD200633A1 (de) * 1981-08-24 1983-05-25 Herbert Schulze Anordnung zur entwaesserung der nassdampfstroemungen in dampfturbinen axialer bauart
JPH0337303A (ja) * 1989-07-05 1991-02-18 Hitachi Ltd 蒸気タービン
JP2001090506A (ja) * 1999-09-22 2001-04-03 Hitachi Ltd 静翼及び蒸気タービン

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB388156A (en) * 1930-12-13 1933-02-23 Asea Ab Improvements in means for draining off moisture from the steam in steam turbines
DE2038047A1 (de) * 1970-07-31 1972-02-03 Maschf Augsburg Nuernberg Ag Entwässerung der Oberflachen der Leitschaufeln und des Stromungsraumes von Dampfturbinen, insbesondere Satt und Naßdampfturbinen
CA1006448A (en) * 1971-09-09 1977-03-08 Ukrainsky Nauchno-Issledovatelsky Institut Prirodnykh Gazov Turboexpander
GB1484289A (en) * 1975-09-26 1977-09-01 English Electric Co Ltd Steam turbines
DD200633A1 (de) * 1981-08-24 1983-05-25 Herbert Schulze Anordnung zur entwaesserung der nassdampfstroemungen in dampfturbinen axialer bauart
JPH0337303A (ja) * 1989-07-05 1991-02-18 Hitachi Ltd 蒸気タービン
JP2001090506A (ja) * 1999-09-22 2001-04-03 Hitachi Ltd 静翼及び蒸気タービン

Also Published As

Publication number Publication date
WO2015185294A1 (fr) 2015-12-10

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