EP0128343B1 - Turbine à carter double avec au moins une soupape pour l'alimentation horizontale de la vapeur - Google Patents

Turbine à carter double avec au moins une soupape pour l'alimentation horizontale de la vapeur Download PDF

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Publication number
EP0128343B1
EP0128343B1 EP84105095A EP84105095A EP0128343B1 EP 0128343 B1 EP0128343 B1 EP 0128343B1 EP 84105095 A EP84105095 A EP 84105095A EP 84105095 A EP84105095 A EP 84105095A EP 0128343 B1 EP0128343 B1 EP 0128343B1
Authority
EP
European Patent Office
Prior art keywords
valve
valve housing
diffuser body
turbine
casing
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.)
Expired
Application number
EP84105095A
Other languages
German (de)
English (en)
Other versions
EP0128343A1 (fr
Inventor
Peter Heiniger
Jaroslav Masek
Herbert Senn
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0128343A1 publication Critical patent/EP0128343A1/fr
Application granted granted Critical
Publication of EP0128343B1 publication Critical patent/EP0128343B1/fr
Expired 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
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
    • F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
    • 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
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/26—Double casings; Measures against temperature strain in casings
    • 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
    • F01D9/00—Stators
    • F01D9/06—Fluid supply conduits to nozzles or the like

Definitions

  • the present invention relates to a two-casing turbine with at least one valve for horizontal steam supply according to the preamble of patent claim 1.
  • the quick-shot and control valves used in steam turbines are arranged separately from the turbine housing outside of the turbine housing and connected to the turbine housing by pipe elbows which open vertically into the turbine housing, the pipe elbows being shaped in such a way that they allow elastic deformations to compensate for the thermal expansions, without being impermissible high thermal stresses occur.
  • the elbows extend from the turbine housing far upwards with a corresponding space requirement in the hall, so that such large vertical elbows cause large hall heights with corresponding additional costs compared to a lower power plant hall.
  • the pipe elbows themselves are also expensive and also pose considerable sealing problems in the area of the flange connections due to the high vapor pressures.
  • control valves were flanged in a vertical position directly on the upper part of the turbine housing or welded to their housing block.
  • control valves but only for single-case turbines, are also flanged or welded directly to the upper part of the housing in a horizontal position. So far, however, this could only be practiced with single-case turbines, because only in the case of revisions can the valve or valves be lifted up alone or together with the case.
  • control valves were either attached directly to the outer casing in a vertical position and connected to the inner casing in a movably sealing manner or the valves were connected to the inner housing by means of a pipe which ended vertically in the same and which was flanged onto the outer housing. This arrangement therefore does not make it possible to lift off the upper part of the housing during revisions without having to remove the supply lines and the associated fastening devices.
  • valve housing engages with a centering shoulder of its connecting flange in a connecting piece of the outer housing upper part and a central part of the valve housing designed as a diffuser extends into a connecting piece of the inner housing, where it is sealed.
  • the object on which the present invention is based cannot be achieved by a valve of this type which is mounted horizontally on a two-housing turbine. In order to be able to lift the upper part of the outer casing, the valve would have to be disconnected from the steam feed line beforehand so that the central part with the diffuser function can be pulled out and the upper part of the casing is thus clear of the inner casing.
  • DE-C-943052 also discloses a valve installed vertically in a housing of a single-housing high-pressure steam turbine, in which the diffuser body is structurally separate from the valve housing, which receives the valve closing body and its actuating elements, and is accommodated within a connecting piece of the upper part of the turbine housing.
  • the diffuser body rests with an annular surface of a collar in the connection piece and is braced in the upper part of the housing from the inside of the housing by an inflow piece which has a thread and forms a connecting line between the diffuser and a nozzle in front of an action wheel.
  • a guide part for the valve closing body which is made in one piece with the valve housing, projects into the connecting piece of the upper part of the turbine housing, so that for this reason alone, such a valve would have to be dismantled from the turbine housing and from the steam feed line in order to mount the upper part of the turbine housing to be able to take off.
  • the disadvantage of two-housing turbines which consists in the fact that the valves used hitherto with regard to the expansion, can only be installed with interposed pipe elbows which open vertically from above into the upper part of the turbine housing, which, as I said, requires larger and therefore more expensive hall heights.
  • the horizontal arrangement of the control valves according to the invention in the upper part of the turbine housing simplifies the assembly and disassembly work and thus also makes the revision work cheaper.
  • FIG. 1, 1 denotes a two-housing high-pressure part of a steam turbine system, each with a steam supply indicated by the arrows 2 and 3 in the upper housing part 4 and in the lower housing part 5.
  • the steam supplied by the boiler enters 2 and 3 in quick-closing valves 6 and 7, respectively and reaches with open valves 6 and 7 in control valves 8 and 9, through which the steam flow to the turbine can be adjusted and regulated.
  • the setting and control of the control valves is carried out by servomotors 10 and 11 that are structurally combined with the control valves.
  • the quick-closing valves 6 and 7 are actuated by servomotors 12 and 13, the task of which, among other things. is to shut off the steam supply suddenly in the event of a disaster.
  • the figure shows a vertical cross section through the inlet spiral of a steam turbine 14, the sectional plane being placed perpendicularly through the axes of two control valves 15 and 16 screwed to the outer housing upper part 20, of which only a part of the valve housing 17 and the diffuser body 18 on the left side are shown, on the other hand, only a part of the diffuser body 19.
  • two of the control valves namely 15 and 16 are attached to the outer housing upper part 20 at the same height, whereas in the turbine according to FIG. 1, one valve each Outer housing lower part 5 is provided.
  • attachment points are provided on the outer housing lower part 21 for the attachment of two steam supply lines, not shown, which connect two control valves to the connecting pieces 22 on the inner housing lower part 23.
  • FIG. 3 shows a cross section through a two-casing steam turbine with a double inlet and a horizontally mounted control valve on the upper part of the outer casing and the lower part of the outer casing.
  • the same reference numerals are assigned to the parts analogous to the embodiment according to FIG. 2 in FIG. 4, which shows the installation of the control valve 15 arranged at the top left in FIG. 2 on a larger scale, shows the exact design of the diffuser body 18 and its position relative to the valve housing 17 and the inner housing upper part 24.
  • the fully drawn outline of the diffuser body defines a first embodiment, in which an annular collar in the region of the valve seat 27 has an outer conical surface 28 which bears against a corresponding inner conical surface in the valve housing 17.
  • a locking screw 34 is provided in the housing 17, which engages with axial play in a bore 35 in the cylindrical shoulder 29 and prevents displacement of the diffuser body 18 when the turbine is cold when the diffuser body is not stuck in the valve housing .
  • the valve housing 17 is made of cast ferrite
  • the diffuser body 18, on the other hand is made of austenitic steel, the thermal expansion coefficient of which is greater than that of the cast iron, so that due to the close fit of the diffuser body in the Valve housing the diffuser body is clamped in the valve housing when the turbine is warm.
  • the diffuser body in the valve housing becomes loose again, so that it can be pulled out without difficulty when the valve is dismantled.
  • a cylindrical shoulder 36 is provided with greater play relative to the bore in the valve housing, the outline of which is indicated by the dash-dotted lines.
  • the support shoulder can be conical in the same way as in the first-mentioned embodiment, or it can be designed as a flat, annular support surface.
  • This design in conjunction with the spherical valve closing body 25, which is movably connected to the valve spindle (not shown), ensures that the diffuser body is free from tension, that is to say without deformation, in the event of relative movements between the outer and inner housing upper parts 20 and 24 caused by different thermal expansions , can adjust to the respective position of the connecting piece 32 relative to the valve housing 17.
  • the bolt end of the locking screw must also engage with play in the longitudinal axis of the bolt in the corresponding bore in the cylindrical shoulder 36 in order not to hinder the adjustment movement of the diffuser body.
  • a support ring 37 enclosing the diffuser body 18 with a small clearance can be provided, particularly in the case of long diffuser channels. This is clamped on its circumference in the sealing joint and can also serve as a guide for inserting the diffuser body into the turbine during assembly.
  • valves of the known types it is possible to carry out assembly and disassembly without having to dismantle lines leading from the valves into the turbine.
  • the valves of the known types it is not possible to remove them from the housing in horizontal installation because of the diffuser body protruding into the outer housing without having to also remove the lines leading to the valve.
  • the diffuser body cannot be pulled out, so that the valve must be pushed out of the turbine by a distance that is at least equal to the length of the part of the diffuser body protruding into the turbine.
  • this since, as mentioned, this is only possible after the line in front of the valve has been dismantled, the horizontal installation of such valves in two-case turbines is not possible because of the difficulties involved.
  • the diffuser body can be pulled out after loosening the locking screw 34, whereupon the upper part of the turbine housing can be removed for inspection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Lift Valve (AREA)

Claims (5)

1. Turbine à double corps avec au moins une soupape (8, 9; 15, 16) pour l'amenée horizontale de vapeur, avec un corps extérieur (4+5) et un corps intérieur (23+24), dans laquelle la soupape (8, 9; 15, 16) est fixée horizontalement au corps extérieur (4+5), par bridage avec une surface plane de raccordement des brides et présente un corps de soupape (17), qui contient un corps de diffuseur (18) avec un siège de soupape (27) ainsi qu'un corps (25) de fermeture de la soupape, qui est fonctionnellement raccordé à un moteur de réglage (10, 11; 12, 13) fixé par bridage au corps de soupape (17), dans lequelle en outre le corps de diffuseur (18) présente dans la région du siège de soupape (27) une collerette (26) avec une surface de butée (28) convexe à laquelle se raccordent, vu dans le sens de l'écoulement, une portée cylindrique (29; 36) ainsi qu'une portion cylindrique (30) de diffuseur, de diamètre plus faible, caractérisée en ce que la portion cylindrique (30) du diffuseur se termine par un tourillon de guidage (31 qui est hermétiquement mobile dans un bourrage annulaire (33) placé dans un conduit de raccordement (32) du corps intérieur (23+24), en ce que le corps de diffuseur (18) s'appuie par sa surface de butée (28) convexe sur une surface de butée concave correspondante ménagée dans le corps de soupape (17), et en ce que la plus petite section libre à l'intérieur du corps de soupape (17) est constituée de telle façon que l'on puisse extraire le corps de diffuseur (18) à partir d'une position de travail, après enlèvement du moteur de réglage (10; 11; 12; 13) et des éléments présents dans le corps de soupape (17), au moins sur une distance, en direction du corps (25) de fermeture de la soupape, telle que la face d'extrémité du tourillon de guidage (31) vienne se situer dans le plan de raccordement des brides du corps de soupape (17), afin de pouvoir soulever la partie supérieure (4) du corps extérieur.
2. Turbine à double corps suivant la revendication 1, caractérisée en ce que le corps de soupape (17) est constitué de fonte ferritique et que le corps de diffuseur (18) est constitué d'acier austénitique, dont le coefficient de dilatation thermique est plus grand que celui de la fonte ferritique, et en ce la portée cylindrique (29) est ajustée avec un faible jeu dans l'alésage correspondant du corps de soupape, de telle sorte que, lorsque la turbine est chaude, le corps de diffuseur (18) se dilate plus fort que le corps de soupape (17) et que le corps de diffuseur (18) soit ainsi serré fermement dans le corps de soupape (17).
3. Turbine à double corps suivant la revendication 1, caractérisée en ce que la surface de butée convexe de la collerette (26) est constituée par une zone sphérique extérieure, et en ce que la portée cylindrique (36) est logée avec un jeu important dans l'alésage correspondant du corps de soupape (17), de telle sorte que le corps de diffuseur (18) puisse suivre les mouvements relatifs entre le corps extérieur (20) et le corps intérieur (24) de la turbine.
4. Turbine à double corps suivant la revendication 1, caractérisée par une vis de sécurité (34) placée dans le corps de soupape (17), qui s'engage par son extrémité de forme cylindrique dans un trou (35) ménagé dans la portée cylindrique (29), afin d'empêcher tout glissement axial du corps de diffuseur (18).
5. Turbine à double corps suivant la revendication 1, caractérisée par une bague d'appui (37) pour le corps de diffuseur (18) à la surface d'étanchéité des brides du corps de soupape (17).
EP84105095A 1983-06-09 1984-05-05 Turbine à carter double avec au moins une soupape pour l'alimentation horizontale de la vapeur Expired EP0128343B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3164/83 1983-06-09
CH3164/83A CH665450A5 (de) 1983-06-09 1983-06-09 Ventil fuer horizontale dampfzufuehrung an zweigehaeuseturbinen.

Publications (2)

Publication Number Publication Date
EP0128343A1 EP0128343A1 (fr) 1984-12-19
EP0128343B1 true EP0128343B1 (fr) 1987-07-15

Family

ID=4250001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105095A Expired EP0128343B1 (fr) 1983-06-09 1984-05-05 Turbine à carter double avec au moins une soupape pour l'alimentation horizontale de la vapeur

Country Status (8)

Country Link
US (1) US4642025A (fr)
EP (1) EP0128343B1 (fr)
JP (1) JPS606004A (fr)
CH (1) CH665450A5 (fr)
CS (1) CS259519B2 (fr)
DE (1) DE3464782D1 (fr)
PL (1) PL145914B1 (fr)
YU (1) YU43572B (fr)

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JPH0674722B2 (ja) * 1984-10-15 1994-09-21 株式会社日立製作所 蒸気タ−ビンの蒸気導入部構造
CH666937A5 (de) * 1985-01-31 1988-08-31 Bbc Brown Boveri & Cie Hochdruckdampfturbine.
US4940383A (en) * 1989-07-21 1990-07-10 Westinghouse Electric Corp. System for admitting steam into a turbine
US5037269A (en) * 1990-01-26 1991-08-06 Westinghouse Electric Corp. Self-locking nozzle blocks for steam turbines
DE19704556C1 (de) * 1997-02-06 1998-04-30 Siemens Ag Einströmabschnitt eines Turbinengehäuses
DE19704541A1 (de) * 1997-02-06 1998-04-23 Siemens Ag Einströmabschnitt eines Turbinengehäuses
DE59804590D1 (de) 1997-04-28 2002-08-01 Siemens Ag Vorrichtung zur wärmeisolierung für eine dampfturbine
DE19815168C2 (de) 1998-04-04 2001-02-22 Man Turbomasch Ag Ghh Borsig Rohrleitungsdurchführung durch zwei oder mehrere Wandungen eines Axialkompressors einer Gasturbine
US6302974B1 (en) * 1998-04-23 2001-10-16 Abb Power Generation Method and apparatus for straightening turbine casings
US6071073A (en) * 1998-05-14 2000-06-06 Dresser-Rand Company Method of fabricating a turbine inlet casing and the turbine inlet casing
DE59907932D1 (de) * 1999-02-04 2004-01-15 Alstom Switzerland Ltd Dampfturbine
DE59910136D1 (de) * 1999-04-21 2004-09-09 Alstom Technology Ltd Baden Diffusor
US6638014B2 (en) 2001-08-17 2003-10-28 Alstom (Switzerland) Ltd Valve arrangement for a power plant
EP1719880A1 (fr) * 2005-05-03 2006-11-08 Siemens Aktiengesellschaft Turbine à vapeur
EP2025873A1 (fr) * 2007-08-08 2009-02-18 Siemens Aktiengesellschaft Introduction de vapeur pour une turbine à vapeur
JP2010048216A (ja) * 2008-08-25 2010-03-04 Fuji Electric Systems Co Ltd 蒸気タービンの主蒸気流入部
CH699864A1 (de) * 2008-10-31 2010-05-14 Alstom Technology Ltd Dampfturbine.
EP2211022A1 (fr) * 2009-01-21 2010-07-28 Siemens Aktiengesellschaft Volute d'entrée d'une turbine à vapeur et turbine à vapeur
EP2216513A1 (fr) * 2009-02-10 2010-08-11 Siemens Aktiengesellschaft Raccordement de soupape sur une turbomachine à trois coques
EP2216512A1 (fr) * 2009-02-10 2010-08-11 Siemens Aktiengesellschaft Turbine à vapeur à trois coques
EP2216515A1 (fr) * 2009-02-10 2010-08-11 Siemens Aktiengesellschaft Turbine à vapeur à trois coques avec une soupape
EP2216514A1 (fr) * 2009-02-10 2010-08-11 Siemens Aktiengesellschaft Turbine à vapeur à trois coques avec une soupape
DE102010053951B4 (de) * 2010-12-09 2021-12-09 Daimler Ag Turbine für einen Abgasturbolader
JP6004947B2 (ja) * 2013-01-08 2016-10-12 三菱日立パワーシステムズ株式会社 蒸気タービン
EP2811207A1 (fr) * 2013-06-06 2014-12-10 Alstom Technology Ltd Ensemble de soupape
CN103769541B (zh) * 2014-01-23 2017-02-01 中国人民解放军总参谋部第六十研究所 蜗壳中心分模成型方法及其成型工装
JP7005464B2 (ja) * 2018-09-28 2022-01-21 株式会社東芝 蒸気タービン車室
JP2020097894A (ja) * 2018-12-17 2020-06-25 東芝エネルギーシステムズ株式会社 タービン車室
US11255441B1 (en) * 2020-08-24 2022-02-22 Dresser, Llc Securing a seat in a valve

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NL7203334A (fr) * 1972-03-14 1973-09-18

Also Published As

Publication number Publication date
CS432884A2 (en) 1987-12-17
YU43572B (en) 1989-08-31
CS259519B2 (en) 1988-10-14
PL248097A1 (en) 1985-01-30
JPH0377367B2 (fr) 1991-12-10
US4642025A (en) 1987-02-10
CH665450A5 (de) 1988-05-13
PL145914B1 (en) 1988-11-30
YU94484A (en) 1988-12-31
EP0128343A1 (fr) 1984-12-19
DE3464782D1 (en) 1987-08-20
JPS606004A (ja) 1985-01-12

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