FR2589517A1 - Bleeder-type steam turbine - Google Patents

Bleeder-type steam turbine Download PDF

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Publication number
FR2589517A1
FR2589517A1 FR8516458A FR8516458A FR2589517A1 FR 2589517 A1 FR2589517 A1 FR 2589517A1 FR 8516458 A FR8516458 A FR 8516458A FR 8516458 A FR8516458 A FR 8516458A FR 2589517 A1 FR2589517 A1 FR 2589517A1
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France
Prior art keywords
steam
stage
orifice
downstream
downstream stage
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.)
Granted
Application number
FR8516458A
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French (fr)
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FR2589517B1 (en
Inventor
Rene Bozec
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Alstom SA
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Alstom SA
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Filing date
Publication date
Application filed by Alstom SA filed Critical Alstom SA
Priority to FR8516458A priority Critical patent/FR2589517B1/en
Publication of FR2589517A1 publication Critical patent/FR2589517A1/en
Application granted granted Critical
Publication of FR2589517B1 publication Critical patent/FR2589517B1/en
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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/223—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves with a plurality of valve members

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

Bleeder-type steam turbine comprising a rotor 5 equipped with several rows of moving blades 6 to 9 and a stator 1, 2 equipped with several rows of fixed blades 22 to 25, each row of fixed blades followed by a row of moving blades, in the direction of flow of the steam, constituting a pressure-relief stage 22, 6, the said stator comprising at least one outlet orifice 26 for bleeding the steam situated between two so-called pressure relief stages, called upstream stage 23, 11 and downstream stage 24, 12, a separation partition 28 being situated in the steam stream between the said orifice 26 and the downstream stage 24, 12, the said turbine further comprising means allowing the steam to pass from the upstream stage to the downstream stage and means for adjusting the steam flow rate at the inlet to the downstream stage, characterised in that the said means allowing the steam to pass from the upstream stage to the downstream stage consist of at least one orifice 29 to 32 made in the said partition, the said means for adjusting the flow rate comprising a shut-off member 34 to 37 with variable opening of the said orifice.

Description

Turbine à vapeur à soutirage
La présente invention concerne une turbine à vapeur à soutirage comportant un rotor équipé de plusieurs rangées d'ailettes mobiles et un stator équipé de plusieurs rangées d'ailettes fixes, chaque rangée d'ailettes fixes suivie d'une rangée d'ailettes mobiles, dans le sens de l'écoulement de la vapeur, constituant un étage de détente, ledit stator comprenant au moins un orifice de sortie pour le soutirage de la vapeur, situé entre deux dits étages de détente, appelés étage amont et étage aval, une cloison de séparation étant située dans la veine vapeur entre ledit orifice et l'étage aval, ladite turbine comprenant en outre des moyens permettant à la vapeur de passer de l'étage amont vers l'étage aval et des moyens de réglage du débit de vapeur à l'admission dudit étage aval.Withdrawal steam turbine
The present invention relates to a racking steam turbine comprising a rotor equipped with several rows of movable fins and a stator equipped with several rows of fixed fins, each row of fixed fins followed by a row of movable fins, in the direction of flow of the vapor, constituting an expansion stage, said stator comprising at least one outlet orifice for drawing off the steam, situated between two said expansion stages, called upstream stage and downstream stage, a partition of separation being located in the vapor stream between said orifice and the downstream stage, said turbine further comprising means allowing the steam to pass from the upstream stage to the downstream stage and means for adjusting the steam flow rate to the admission of said downstream stage.

On connait de telles turbines, la vapeur soutirée étant utilisée pour un processus industriel quelconque. Dans ces turbines connues, les moyens qui permettent à la vapeur de passer de l'étage amont vers l'étage aval comportent une sortie de la vapeur hors de la veine axiale, cette sortie étant située entre la cloison et l'étage amont. Elle est matérialisée par un passage radial de la vapeur vers l'extérieur puis par un retour radial en aval de la cloison pour l'alimentation de l'étage aval de détente. Such turbines are known, the withdrawn steam being used for any industrial process. In these known turbines, the means which allow the steam to pass from the upstream stage to the downstream stage comprise an outlet for the steam outside the axial stream, this outlet being situated between the partition and the upstream stage. It is materialized by a radial passage of the steam to the outside and then by a radial return downstream of the partition for the supply of the downstream expansion stage.

Des soupapes de réglage du débit, généralement au nombre de deux ou trois étant disposées sur le parcours entre la sortie et le retour. Flow control valves, generally two or three in number, are arranged on the path between the outlet and the return.

Ce dispositif est situé soit en verrue sur le stator de la turbine ou bien alors, le système de soupape, complètement hors du stator, est relié à la turbine par des tuyauteries. This device is located either in a wart on the stator of the turbine or else, the valve system, completely outside the stator, is connected to the turbine by pipes.

Lorsque les débits volume de vapeur sont importants, en basse pression par exemple, l'encombrement d'un tel système devient considérable et les pertes de charges importantes. When the steam volume flow rates are high, at low pressure for example, the size of such a system becomes considerable and the pressure losses significant.

La présente invention a pour but de pallier ces inconvénients et a pour objet une turbine à vapeur à soutirage telle que définie ci-dessus et est caractérisée en ce que lesdits moyens permettant à la vapeur de passer de l'étage amont vers l'étage aval sont constitués par au moins un orifice réalisé dans ladite cloison, lesdits moyens de réglage du débit comportant un organe obturateur, à ouverture variable, dudit orifice. The present invention aims to overcome these drawbacks and relates to a racking steam turbine as defined above and is characterized in that said means allowing steam to pass from the upstream stage to the downstream stage are constituted by at least one orifice made in said partition, said means for adjusting the flow rate comprising a shutter member, with variable opening, of said orifice.

Selon une réalisation préférée, ledit organe obturateur est constitué par un volet basculant. According to a preferred embodiment, said shutter member consists of a tilting flap.

On va maintenant donner la description d'un exemple de réalisation de l'invention en référence au dessin annexé dans lequel
La figure 1 est une vue partielle en coupe axiale, selon I-I de la figure 2, d'une turbine selon l'invention.We will now give the description of an exemplary embodiment of the invention with reference to the accompanying drawing in which
Figure 1 is a partial view in axial section, along II of Figure 2, of a turbine according to the invention.

La figure 2 est une section selon II-II de la figure 1. Figure 2 is a section along II-II of Figure 1.

En se reportant aux figures, la turbine comporte un stator comprenant un corps haute pression 1, à droite sur la figure 1, et un corps basse pression 2, à gauche sur la figure 1, reliés l'un à l'autre par brides 3, 4. Referring to the figures, the turbine comprises a stator comprising a high pressure body 1, on the right in FIG. 1, and a low pressure body 2, on the left in FIG. 1, connected to each other by flanges 3 , 4.

Les corps haute pression et basse pression sont eux-mêmes réalisés en deux parties avec un plan de joint médian P comme on le voit sur la figure 2. The high pressure and low pressure bodies are themselves made in two parts with a median joint plane P as seen in FIG. 2.

A l'intérieur du stator est situé un rotor 5 muni de roues 6, 7, 8, 9, équipées chacune d'une rangée d'ailettes mobiles 10, 11, 12, 13. Inside the stator is located a rotor 5 provided with wheels 6, 7, 8, 9, each equipped with a row of movable fins 10, 11, 12, 13.

Le stator est muni de diaphragmes constitués chacun par une couronne extérieure, respectivement 14, 15, 16, 17 et par une couronne intérieure, respectivement 18, 19, 20, 21. Les couronnes extérieure et intérieure de chaque diaphragme sont reliées par une rangée d'ailettes fixes, respectivement 22, 23, 24, 25. The stator is provided with diaphragms each consisting of an outer ring, respectively 14, 15, 16, 17 and by an inner ring, respectively 18, 19, 20, 21. The outer and inner rings of each diaphragm are connected by a row of '' fixed fins, respectively 22, 23, 24, 25.

Chaque rangée d'ailettes fixes, suivie d'une rangée d'ailettes mobiles, par exemple 23, 11, constitue un étage de détente de la turbine. Entre la rangée d'ailettes mobiles 11 et la rangée d'ailettes fixes 24, le stator, dans sa partie corps basse pression 1, comprend deux orifices de sortie 26 et 27 pour un soutirage de vapeur. Ces orifices 26 et 27 sont situés à 900 l'un de l'autre et vers le bas. Ils ont été représentés en traits mixtes sur la figure 2 pour figurer qu'ils sont situés en avant du plan de coupe. Each row of fixed fins, followed by a row of movable fins, for example 23, 11, constitutes an expansion stage of the turbine. Between the row of movable fins 11 and the row of fixed fins 24, the stator, in its low pressure body part 1, includes two outlet orifices 26 and 27 for drawing off steam. These holes 26 and 27 are located 900 from one another and downwards. They have been shown in phantom in Figure 2 to show that they are located in front of the section plane.

En aval des orifices 26 et 27 et en amont de la rangée d'ailettes fixes 24, est disposée, dans le stator de turbine, perpendiculairement à son axe, une cloison 28 percée de quatre ouvertures 29, 30, 31 et 32, en l'occurence circulaires. Cette cloison 28 est serrée entre les brides 3 et 4 de liaison du corps basse pression 1 et du corps haute pression 2 et elle est réalisée en deux parties assemblées dans le plan de joint P de la turbine, comme d'ailleurs les couronnes des diaphragmes. La cloison 28 s'étend radialement depuis le stator jusqu'à une bague d'étanchéité 33 qui entoure le rotor 5. Un écran conique 58 est disposé entre la sortie de l'éta- ge 19, 11 et la cloison 28 sur laquelle il est soudé. Downstream of the orifices 26 and 27 and upstream of the row of fixed fins 24, a partition 28 pierced with four openings 29, 30, 31 and 32, in l, is arranged in the turbine stator, perpendicular to its axis. 'circular occurrences. This partition 28 is clamped between the flanges 3 and 4 for connecting the low pressure body 1 and the high pressure body 2 and it is produced in two parts assembled in the joint plane P of the turbine, like the crowns of the diaphragms. . The partition 28 extends radially from the stator to a sealing ring 33 which surrounds the rotor 5. A conical screen 58 is disposed between the outlet of the stage 19, 11 and the partition 28 on which it is welded.

Afin de pouvoir règler le débit de vapeur à l'entrée de l'étage basse pression 24, 12, les ouvertures circulaires 29 à 32 de la cloison 28 sont chacune munie d'un cadre, 54 à 57, formant corps de vanne et recevant un organe d'obturation variable constitué par un volet basculant, genre vanne papillon, 34, 35, 36 et 37. In order to be able to regulate the steam flow at the inlet of the low pressure stage 24, 12, the circular openings 29 to 32 of the partition 28 are each provided with a frame, 54 to 57, forming a valve body and receiving a variable closure member constituted by a tilting flap, such as a butterfly valve, 34, 35, 36 and 37.

Chaque vanne papillon comporte un axe, respectivement 38 à 41, de commande qui traverse le corps basse pression 1 et qui est relié à un servo-moteur de commande 42 à 45 par un levier de commande 46 à 49. Each butterfly valve has a control axis 38 to 41, respectively, which passes through the low-pressure body 1 and which is connected to a control servo-motor 42 to 45 by a control lever 46 to 49.

Les servo-moteurs de commande sont fixés à des supports 50 à 53.The control servo motors are fixed to supports 50 to 53.

Dans l'exemple décrit, il y a quatre vannes papillons circulaires. Il est bien évident que ces vannes pourraient avoir une autre forme telle qu'elliptique, rectangulaire etc... et que leur nombre pourrait également être différent. Cependant, ces vannes sont régulièrement réparties, et leur ouverture successive est réalisée de manière symétrique. In the example described, there are four circular butterfly valves. It is obvious that these valves could have another shape such as elliptical, rectangular etc ... and that their number could also be different. However, these valves are regularly distributed, and their successive opening is carried out symmetrically.

Ainsi, en fonction de la pression de soutirage nécessaire, on ouvre plus ou moins un nombre plus ou moins important de vannes. Thus, depending on the required withdrawal pressure, more or less a greater or lesser number of valves are opened.

A titre d'exemple, on peut avoir, pour une pression de vapeur à la sortie de l'étage 19, 11 de 0,48 bars absolus, et pour une vitesse de passage de 60 à 70 m/s, deux orifices de soutirages 26, 27 de 800 mm de diamètre chacun et quatre vannes papillons 34 à 37 de 800 mm de diamètre chacune. For example, there can be, for a vapor pressure at the outlet of stage 19, 11 of 0.48 bar absolute, and for a passage speed of 60 to 70 m / s, two withdrawal orifices 26, 27 of 800 mm diameter each and four butterfly valves 34 to 37 of 800 mm diameter each.

Sur les figures, on a représenté une seule vanne ouverte : la vanne 34. In the figures, a single open valve has been shown: valve 34.

Grâce à l'invention, où les organes de réglage sont situés à l'intérieur du stator, donc dans la veine de vapeur, l'encombrement est réduit, puisque l'on a complètement supprimé les volumes de trans fert par l'extérieur, il en résulte également une grande diminution de perte de charge. Thanks to the invention, where the adjustment members are located inside the stator, therefore in the vapor stream, the space requirement is reduced, since the volumes of transfer from the outside have been completely eliminated, it also results in a large reduction in pressure drop.

En outre, la partie basse pression est mieux alimentée puisque les organes de réglage (clapets) sont situés dans l'axe de la veine et régulièrement disposés autour de l'axe de la turbine, on a donc une meilleure possibilité d'adaptation sur un point garanti de fonctionnement.  In addition, the low pressure part is better supplied since the adjustment members (valves) are located in the axis of the stream and regularly arranged around the axis of the turbine, so there is a better possibility of adaptation on a guaranteed operating point.

Claims (2)

REVENDICATIONS 1/ Turbine à vapeur à soutirage comportant un rotor (5) équipé de plusieurs rangées d'ailettes mobiles (6 à 9) et un stator (1, 2) équipé de plusieurs rangées d'ailettes fixes (22 à 25), chaque rangée d'ailettes fixes suivie d'une rangée d'ailettes mobiles, dans le sens de l'écoulement de la vapeur, constituant un étage de détente, (22, 6) ledit stator comprenant au moins un orifice de sortie (26) pour le soutirage de la vapeur situé entre deux dits étages de détente, appelés étage amont (23, 11) et étage aval (24, 12), une cloison de séparation (28) étant située dans la veine vapeur entre ledit orifice (26) et l'étage aval (24, 12), ladite turbine comprenant en outre des moyens permettant à la vapeur de passer de l'étage amont vers l'étage aval et des moyens de réglage du débit de vapeur à l'admission dudit étage aval, caractérisée en ce que lesdits moyens permettant à la vapeur de passer de l'étage amont vers l'étage aval sont constitués par au moins un orifice (29 à 32) réalisé dans ladite cloison, lesdits moyens de réglage du débit comportant un organe obturateur (34 à 37) à ouverture variable, dudit orifice.1 / Withdrawal steam turbine comprising a rotor (5) equipped with several rows of movable fins (6 to 9) and a stator (1, 2) equipped with several rows of fixed fins (22 to 25), each row of fixed fins followed by a row of movable fins, in the direction of flow of the vapor, constituting an expansion stage, (22, 6) said stator comprising at least one outlet orifice (26) for the steam extraction located between two said expansion stages, called upstream stage (23, 11) and downstream stage (24, 12), a partition wall (28) being located in the vapor stream between said orifice (26) and l downstream stage (24, 12), said turbine further comprising means allowing steam to pass from the upstream stage to the downstream stage and means for adjusting the steam flow rate at the inlet of said downstream stage, characterized in that said means allowing the steam to pass from the upstream stage to the downstream stage consist of at least one orifice (29 to 32) made in s said partition, said means for adjusting the flow rate comprising a shutter member (34 to 37) with variable opening, of said orifice. 2/ Turbine à vapeur à soutirage selon la revendication 1 caractérisée en ce que ledit organe obturateur est constitué par un volet basculant. 2 / Withdrawal steam turbine according to claim 1 characterized in that said shutter member is constituted by a tilting flap.
FR8516458A 1985-11-06 1985-11-06 DRAWING STEAM TURBINE Expired FR2589517B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8516458A FR2589517B1 (en) 1985-11-06 1985-11-06 DRAWING STEAM TURBINE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8516458A FR2589517B1 (en) 1985-11-06 1985-11-06 DRAWING STEAM TURBINE

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FR2589517A1 true FR2589517A1 (en) 1987-05-07
FR2589517B1 FR2589517B1 (en) 1989-08-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997043522A1 (en) * 1996-05-15 1997-11-20 Abb Stal Ab A steam turbine
WO2002075184A1 (en) * 2001-03-08 2002-09-26 Siemens Aktiengesellschaft Steam line closing valve and steam turbine plant comprising such a steam line closing valve
FR2879564A1 (en) * 2004-12-20 2006-06-23 Airbus France Sas VENTILATION AIR ENTRY ARRANGEMENT WITH MOBILE SHUTTER ELEMENT

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE183860C (en) *
GB277779A (en) * 1923-03-20 1924-04-25 James Edwin Ellor Improvements in or relating to turbine nozzles
US1538255A (en) * 1922-03-16 1925-05-19 Mcore Steam Turbine Corp Turbine bleeder valve
US1542162A (en) * 1923-05-09 1925-06-16 Moore Steam Turbine Corp Turbine bleeder valve
US1823311A (en) * 1929-10-10 1931-09-15 Westinghouse Electric & Mfg Co Nozzle valve
US2518660A (en) * 1944-09-07 1950-08-15 Wright Aeronautical Corp Internal-combustion engine and exhaust gas turbine therefor
CH487334A (en) * 1969-03-07 1970-03-15 Le Metallichesky Zd Im Xxii Si Shut-off device for the steam path of a steam turbine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE183860C (en) *
US1538255A (en) * 1922-03-16 1925-05-19 Mcore Steam Turbine Corp Turbine bleeder valve
GB277779A (en) * 1923-03-20 1924-04-25 James Edwin Ellor Improvements in or relating to turbine nozzles
US1542162A (en) * 1923-05-09 1925-06-16 Moore Steam Turbine Corp Turbine bleeder valve
US1823311A (en) * 1929-10-10 1931-09-15 Westinghouse Electric & Mfg Co Nozzle valve
US2518660A (en) * 1944-09-07 1950-08-15 Wright Aeronautical Corp Internal-combustion engine and exhaust gas turbine therefor
CH487334A (en) * 1969-03-07 1970-03-15 Le Metallichesky Zd Im Xxii Si Shut-off device for the steam path of a steam turbine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997043522A1 (en) * 1996-05-15 1997-11-20 Abb Stal Ab A steam turbine
US6162013A (en) * 1996-05-15 2000-12-19 Abb Stal Ab Steam turbine
WO2002075184A1 (en) * 2001-03-08 2002-09-26 Siemens Aktiengesellschaft Steam line closing valve and steam turbine plant comprising such a steam line closing valve
US6929447B2 (en) 2001-03-08 2005-08-16 Siemens Aktiengesellschaft Steam line closing valve and steam turbine plant comprising such a steam line closing valve
CN100416144C (en) * 2001-03-08 2008-09-03 西门子公司 Steam line closing valve and steam turbine plant comprising such steam line closing valve
FR2879564A1 (en) * 2004-12-20 2006-06-23 Airbus France Sas VENTILATION AIR ENTRY ARRANGEMENT WITH MOBILE SHUTTER ELEMENT
WO2006067299A1 (en) * 2004-12-20 2006-06-29 Airbus France Ventilating air intake arrangement with mobile closing device
US8651925B2 (en) 2004-12-20 2014-02-18 Airbus Operations Sas Ventilating air intake arrangement with mobile closing device

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