EP0165846A1 - Liquid injection device in a tube and steam generator having such a device - Google Patents

Liquid injection device in a tube and steam generator having such a device Download PDF

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Publication number
EP0165846A1
EP0165846A1 EP85401000A EP85401000A EP0165846A1 EP 0165846 A1 EP0165846 A1 EP 0165846A1 EP 85401000 A EP85401000 A EP 85401000A EP 85401000 A EP85401000 A EP 85401000A EP 0165846 A1 EP0165846 A1 EP 0165846A1
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EP
European Patent Office
Prior art keywords
cannula
tube
fluid
sheath
inlet
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
EP85401000A
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German (de)
French (fr)
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EP0165846B1 (en
Inventor
Jean Edmond Chaix
Michel Metteey
Jean-Paul Badoux
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
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Publication of EP0165846A1 publication Critical patent/EP0165846A1/en
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Publication of EP0165846B1 publication Critical patent/EP0165846B1/en
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F22B21/22—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes of form other than straight or substantially straight
    • F22B21/26—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes of form other than straight or substantially straight bent helically, i.e. coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/18—Inserts, e.g. for receiving deposits from water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/62—Component parts or details of steam boilers specially adapted for steam boilers of forced-flow type
    • F22B37/70—Arrangements for distributing water into water tubes
    • F22B37/72—Arrangements for distributing water into water tubes involving injection devices

Definitions

  • the present invention relates to a device for injecting a Liquid into a tube comprising a cannula disposed in said tube, this cannula comprising, in the direction of injection of the fluid, a passage of narrowed section followed by a divergent. It is particularly applicable to the injection of water into a steam generator, in particular of the single pass type with vertical penetration.
  • Single-pass helical steam generators have a pressure-resistant jacket containing coiled tubes.
  • a first heat transfer fluid called the primary fluid circulates outside these tubes.
  • a secondary fluid flows through the network of tubes. It penetrates through the cover of the envelope into the tubes by thermal sleeves which pass through a tube plate, then descends by bundles of straight tubes placed in the central zone of the steam generator to the base of the tubes wound by When it rises and leaves in the form of vapor through sleeves which pass through the cover at its periphery.
  • the flow rate of the secondary fluid can be the seat of instabilities which appear particularly in low power conditions and which seriously disturb the operation of the device.
  • the invention relates to a device for injecting a fluid into a tube which overcomes these drawbacks.
  • This device is characterized in that it comprises a cannula disposed in said tube, said canute comprising, in the direction of injection of the fluid, a passage of reduced section followed by a divergent.
  • the cross section of the fluid in the cannula is determined in such a way that the speed of this fluid is greater than 0.7 m / s.
  • the invention relates to a steam generator.
  • This generator comprises an envelope, a tube plate, situated inside the envelope and dividing the envelope into a water box and a heat exchange zone, an inlet and an outlet for a primary fluid, located in the heat exchange zone of the envelope, an inlet and an outlet for a secondary fluid, located in the water box, a plurality of tubes having an inlet end and an outlet end for the secondary fluid, said inlet and outlet ends being fixed to the tube plate, each tube comprising a rectilinear part on the side of its inlet end, a device for injecting the secondary fluid into a tube comprising a tube, called a cannula, disposed at The interior of the inlet end of a tube and having a passage section for the secondary fluid.
  • Said passage section of the cannula is followed, in the direction of circulation of the secondary fluid, by a divergent, a sheath being disposed between said cannula and the straight part of the tube, means being provided for centering the cannula relative to this straight part of the tube.
  • FIG 1 is a sectional perspective view of a steam generator of the single pass type with vertical penetration equipped with an injection device produced in accordance with the present invention; this generator, designated by the general reference 2, comprises a pressure-resistant envelope 4, of generally elongated cylindrical shape and of vertical axis.
  • the envelope 4 has a curved bottom 11. It is closed at its upper part by a cover 6. Between the cover and the envelope is a thick plate 8 called tube plate.
  • the cover 6 has a domed shape which delimits a volume 7 called "water box".
  • the water box 7 is divided into two zones by the ferrule 16, a circular central zone for the entry of water and an annular zone for the exit of steam. Line 18 drains steam.
  • Each tube has a straight part 10a arranged vertically and fixed to the tube plate.
  • the straight part 10a ends in a bend which connects it to a spiral part 10b connected to the peripheral zone of the tube plate 8.
  • An inlet 4a and an outlet 4b are arranged in the casing 4 to allow the circulation of a primary fluid.
  • a secondary fluid circulates inside the network of tubes 10. The secondary fluid, for example water, penetrates in the direction indicated by the arrow 14 then into the water box 7 in the right part 10a of the tubes 10.
  • the flow rate of the secondary fluid can be the seat of instabilities in low power regime.
  • the Applicant has been able to establish that during its fall in the straight tubes, the water heats up and has time to reach its saturation temperature. Consequently, vapor bubbles form which tend to rise. The current is too weak to entrain them. These bubbles accumulate at the entrance to the steam generator in the central area of the water box 7 and form a vapor blanket there, which abruptly condenses on contact with the cold water which enters the steam generator. . This brutal condensation produces a depression which causes a reversal of the flow by sucking upwards the water which has just been injected. This transient phenomenon is followed by a return to normal conditions and the sequence begins periodically.
  • the invention relates to a device for injecting a fluid into a tube which eliminates this phenomenon. This result is obtained by increasing the injection speed so that the water does not have time to reach its saturation temperature during its passage through the straight tubes 10a. Tests have shown that for a steam generator such as that shown in FIG. 1, the injection speed must be greater than 0.7 m / s.
  • FIG. 2 a sectional view of a preferred embodiment of an injection device of the invention.
  • Reference 8 designates the tube plate and Reference 10 has a tube fixed in this tube plate.
  • the tube 10a is surmounted by a head piece 228. This piece is fixed to the tube by forced fitting or by welding.
  • the injection device comprises a cannula 220 constituted by a tube comprising a central duct 238 of reduced section and the diameter of which has been determined so that the speed of the secondary fluid is always greater than 0.7 m / sec.
  • the cannula 220 has a divergent 222 making it possible to increase the passage section offered to the fluid and consequently to reduce its speed to a low value, so as not to produce erosion in the bend of the tube located immediately downstream of La cannule.
  • the insert by welding, in LaqueLLe is produced
  • the divergent 222 externally comprises a conical part 250 intended for centering and immobilizing the cannula relative to the tube 10a.
  • the cannula has a threaded part 260.
  • a clamping ring 262 is screwed onto the threaded part 260.
  • the ring 262 is immobilized by a lock nut 264 stopped in rotation in a known manner.
  • the cannula 220 is surrounded by a sheath 220 'which has an outer shoulder 221'.
  • the part on LaqueLLe is made the shoulder 221 'is attached by welding to the main part of the sheath.
  • the sheath At its lower part, the sheath has a cylindrical centering part 226 ′ whose external diameter is close to the internal diameter of the tube 10a.
  • the sheath also has a female cone 250 'adapted to cooperate with the male cone 250 of the cannula. Longitudinal slots 224 'are made to give elasticity and allow the expansion of the conical part 250'.
  • the head piece 228 has an internal shoulder intended to support the shoulder 221 ′ of the sheath.
  • a plug 230 is screwed into an internal threaded part of the head piece. This cap tightens the shoulder 221 'on the head piece.
  • the plug has a housing for a helical spring 266 which surrounds the cannula 220 and which is located between the plug 230 and the clamping ring 262.
  • the spring 266 has the function of ensuring the tightening and expansion of the part. conical 250 'of the sheath.
  • This embodiment has the advantage of making it possible to compensate for the differential expansions between the cannula and the sheath at the time of cold water injection.
  • the relative displacement of the cannula relative to the sheath is done freely at the level of the head pieces and not under friction stress in the tube 10a.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • External Artificial Organs (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Detergent Compositions (AREA)

Abstract

La canule (220) comporte un divergent (222), des moyens situés à la partie basse de la canule (220) pour la centre et l'immobiliser en translation par rapport au tube (10a), un fourreau (220') entourant la canule. Les moyens pour centrer et immobiliser en translation la canule sur le tube (10a) sont constitués par une partie de centrage (226'), au moins une fente (224') et un cône intérieur (250') formé dans le fourreau, par un cône extérieur (250) fromé à la partie basse de la canule (220), les cônes (250) et (250') étant adaptés à coopérer, des moyens étant prévus pour appliquer élastiquement le cône extérieur (250) sur le cône intérieur (250').The cannula (220) comprises a divergent (222), means located at the bottom of the cannula (220) for the center and immobilize it in translation relative to the tube (10a), a sheath (220 ') surrounding the cannula. The means for centering and immobilizing in translation the cannula on the tube (10a) consist of a centering part (226 '), at least one slot (224') and an internal cone (250 ') formed in the sheath, by an outer cone (250) made from the lower part of the cannula (220), the cones (250) and (250 ') being adapted to cooperate, means being provided for resiliently applying the outer cone (250) to the inner cone (250 ').

Description

La présente invention a pour objet un dispositif d'injection d'un Liquide dans un tube comportant une canule disposée dans Ledit tube, cette canule comportant, dans le sens d'injection du fluide, un passage de section rétrécie suivi d'un divergent. Elle s'applique particulièrement à l'injection d'eau dans un générateur de vapeur, notamment du type simple passe à pénétration verticale.The present invention relates to a device for injecting a Liquid into a tube comprising a cannula disposed in said tube, this cannula comprising, in the direction of injection of the fluid, a passage of narrowed section followed by a divergent. It is particularly applicable to the injection of water into a steam generator, in particular of the single pass type with vertical penetration.

Les générateurs de vapeur en hélice du type simple passe comportent une enveloppe résistante à la pression contenant des tubes bobinés. Un premier fluide caloporteur appelé fluide primaire circule à l'extérieur de ces tubes. Un fluide secondaire parcourt le réseau de tubes. Il pénètre à travers Le couvercle de l'enveloppe dans Les tubes par des manchons thermiques qui traversent une plaque à tubes, puis descend par des faisceaux de tubes droits placés dans La zone centrale du générateur de vapeur jusqu'à La base des tubes bobinés par LesqueLs il remonte et ressort sous forme de vapeur par des manchons qui traversent Le couvercle à sa périphérie.Single-pass helical steam generators have a pressure-resistant jacket containing coiled tubes. A first heat transfer fluid called the primary fluid circulates outside these tubes. A secondary fluid flows through the network of tubes. It penetrates through the cover of the envelope into the tubes by thermal sleeves which pass through a tube plate, then descends by bundles of straight tubes placed in the central zone of the steam generator to the base of the tubes wound by When it rises and leaves in the form of vapor through sleeves which pass through the cover at its periphery.

Dans un tel générateur de vapeur, Le débit du fluide secondaire peut être Le siège d'instabilités qui apparaissent particulièrement en régime de faible puissance et qui perturbent gravement Le fonctionnement de l'appareil.In such a steam generator, the flow rate of the secondary fluid can be the seat of instabilities which appear particularly in low power conditions and which seriously disturb the operation of the device.

L'invention a pour objet un dispositif d'injection d'un fluide dans un tube qui remédie à ces inconvénients. Ce dispositif se caractérise en ce qu'il comporte une canule disposée dans Ledit tube, ladite canute comportant, dans le sens d'injection du fluide, un passage de section réduite suivi d'un divergent.The invention relates to a device for injecting a fluid into a tube which overcomes these drawbacks. This device is characterized in that it comprises a cannula disposed in said tube, said canute comprising, in the direction of injection of the fluid, a passage of reduced section followed by a divergent.

Les essais ont montré que L'utiLisation d'un tel dispositif d'injection permet de supprimer Les instabilités constatées.Tests have shown that the use of such an injection device makes it possible to eliminate the instabilities observed.

De préférence, La section de passage du fluide dans La canule est déterminée de manière telle que La vitesse de ce fluide soit supérieure à 0,7 m/s.Preferably, the cross section of the fluid in the cannula is determined in such a way that the speed of this fluid is greater than 0.7 m / s.

Par ailleurs, L'invention concerne un générateur de vapeur. Ce générateur comporte une enveloppe, une plaque à tubes, située à L'intérieur de L'enveloppe et divisant L'enveLoppe en une boîte à eau et une zone d'échange thermique, une entrée, et une sortie pour un fluide primaire, situées dans La zone d'échange thermique de L'enveLoppe, une entrée et une sortie pour un fluide secondaire, situées dans La boite à eau, une pLuralité de tubes présentant une extrémité d'admission et une extrémité de sortie pour Le fluide secondaire, Lesdites extrémités d'admission et de sortie étant fixées à La plaque à tubes, chaque tube comportant une partie rectiligne du côté de son extrémité d'admission, un dispositif d'injection du fluide secondaire dans un tube comportant un tube, appelé canule, disposé à L'intérieur de L'extrémité d'admission d'un tube et comportant une section de passage pour Le fLuide secondaire. Ladite section de passage de La canule est suivie, dans Le sens de La circulation du fluide secondaire, d'un divergent, un fourreau étant disposé entre Ladite canule et La partie rectiligne du tube, des moyens étant prévus pour centrer La canule par rapport à cette partie rectiligne du tube.Furthermore, the invention relates to a steam generator. This generator comprises an envelope, a tube plate, situated inside the envelope and dividing the envelope into a water box and a heat exchange zone, an inlet and an outlet for a primary fluid, located in the heat exchange zone of the envelope, an inlet and an outlet for a secondary fluid, located in the water box, a plurality of tubes having an inlet end and an outlet end for the secondary fluid, said inlet and outlet ends being fixed to the tube plate, each tube comprising a rectilinear part on the side of its inlet end, a device for injecting the secondary fluid into a tube comprising a tube, called a cannula, disposed at The interior of the inlet end of a tube and having a passage section for the secondary fluid. Said passage section of the cannula is followed, in the direction of circulation of the secondary fluid, by a divergent, a sheath being disposed between said cannula and the straight part of the tube, means being provided for centering the cannula relative to this straight part of the tube.

D'autres caractéristiques et avantages de L'invention apparaîtront encore à La Lecture de La description qui suit Les exemples de réalisation donnés à titre illustratif, en référence aux dessins annexés, sur LesqueLs :

  • - La figure 1 est une vue en coupe et en perspective d'un générateur de vapeur du type simple passe, dans lequel est installé un dispositif d'injection conforme à l'invention ;
  • - La figure 2 est une vue en coupe d'un mode de réalisation de L'invention.
Other characteristics and advantages of the invention will appear on reading the following description The exemplary embodiments given by way of illustration, with reference to the appended drawings, on LesqueLs:
  • - Figure 1 is a sectional perspective view of a steam generator of the single pass type, in which is installed an injection device according to the invention;
  • - Figure 2 is a sectional view of an embodiment of the invention.

La figure 1 est une vue en coupe et en perspective d'un générateur de vapeur du type simple passe à pénétration verticale équipé d'un dispositif d'injection réalisé conformément à La présente invention ; ce générateur, désigné par la référence générale 2, comporte une enveloppe 4 résistant à la pression, de forme générale cylindrique allongée et d'axe vertical. L'enveloppe 4 présente un fond bombé 11. Elle est fermée à sa partie supérieure par un couvercle 6. Entre Le couvercle et L'enveLoppe se trouve une plaque épaisse 8 appelée plaque à tubes. Le couvercle 6 présente une forme bombée qui délimite un volume 7 appelé "boite à éau". La boîte à eau 7 est divisée en deux zones par La virole 16, une zone centrale circulaire pour L'entrée de L'eau et une zone annulaire de sortie de vapeur. Une canalisation 18 évacue La vapeur. A L'intérieur de l'enveloppe 2, on trouve un réseau de tubes 10. Chaque tube comporte une partie droite 10a disposée verticalement et fixée à La plaque à tubes. La partie droite 10a se termine par un coude qui La raccorde à une partie en spirale 10b raccordée à La zone périphérique de La plaque à tubes 8. Une entrée 4a et une sortie 4b sont aménagées dans l'enveloppe 4 pour permettre la circulation d'un fluide primaire. Un fluide secondaire circule à L'intérieur du réseau des tubes 10. Le fluide secondaire, par exemple de l'eau, pénètre selon Le sens indiqué par La flèche 14 puis dans La boite à eau 7 dans la partie droite 10a des tubes 10.Figure 1 is a sectional perspective view of a steam generator of the single pass type with vertical penetration equipped with an injection device produced in accordance with the present invention; this generator, designated by the general reference 2, comprises a pressure-resistant envelope 4, of generally elongated cylindrical shape and of vertical axis. The envelope 4 has a curved bottom 11. It is closed at its upper part by a cover 6. Between the cover and the envelope is a thick plate 8 called tube plate. The cover 6 has a domed shape which delimits a volume 7 called "water box". The water box 7 is divided into two zones by the ferrule 16, a circular central zone for the entry of water and an annular zone for the exit of steam. Line 18 drains steam. Inside the envelope 2, there is a network of tubes 10. Each tube has a straight part 10a arranged vertically and fixed to the tube plate. The straight part 10a ends in a bend which connects it to a spiral part 10b connected to the peripheral zone of the tube plate 8. An inlet 4a and an outlet 4b are arranged in the casing 4 to allow the circulation of a primary fluid. A secondary fluid circulates inside the network of tubes 10. The secondary fluid, for example water, penetrates in the direction indicated by the arrow 14 then into the water box 7 in the right part 10a of the tubes 10.

Dans un générateur de vapeur de ce type, Le débit du fluide secondaire peut être le siège d'instabilités en régime de faible puissance. La demanderesse a pu établir que pendant sa chute dans Les tubes droits, L'eau se réchauffe et a Le temps d'atteindre sa température de saturation. Par conséquent, il se forme des bulles de vapeur qui ont tendance à remonter Le courant trop faible pour Les entraîner. Ces buLLes viennent s'accumuler à L'entrée du générateur de vapeur dans La zone centrale de La boîte à eau 7 et y former un matelas de vapeur, LequeL se condense brusquement au contact de L'eau froide qui pénètre dans Le générateur de vapeur. Cette condensation brutale produit une dépression qui provoque une inversion du débit en aspirant vers Le haut L'eau qui vient d'être injectée. Ce phénomène transitoire est suivi d'un retour aux conditions normales et La séquence recommence périodiquement.In a steam generator of this type, the flow rate of the secondary fluid can be the seat of instabilities in low power regime. The Applicant has been able to establish that during its fall in the straight tubes, the water heats up and has time to reach its saturation temperature. Consequently, vapor bubbles form which tend to rise. The current is too weak to entrain them. These bubbles accumulate at the entrance to the steam generator in the central area of the water box 7 and form a vapor blanket there, which abruptly condenses on contact with the cold water which enters the steam generator. . This brutal condensation produces a depression which causes a reversal of the flow by sucking upwards the water which has just been injected. This transient phenomenon is followed by a return to normal conditions and the sequence begins periodically.

L'invention a pour objet un dispositif d'injection d'un fluide dans une tubulure qui supprime ce phénomène. Ce résultat est obtenu par L'augmentation de La vitesse d'injection de manière que L'eau n'ait pas Le temps d'atteindre sa température de saturation pendant son passage dans Les tubes droits 10a. Des essais ont montré que pour un générateur de vapeur tel que celui qui est représenté sur La figure 1, La vitesse d'injection doit être supérieure à 0,7 m/s.The invention relates to a device for injecting a fluid into a tube which eliminates this phenomenon. This result is obtained by increasing the injection speed so that the water does not have time to reach its saturation temperature during its passage through the straight tubes 10a. Tests have shown that for a steam generator such as that shown in FIG. 1, the injection speed must be greater than 0.7 m / s.

On a représenté sur La figure 2 une vue en coupe d'un mode de réalisation préféré d'un dispositif d'injection de L'invention.There is shown in Figure 2 a sectional view of a preferred embodiment of an injection device of the invention.

La référence 8 désigne La plaque à tubes et La référence 10a un tube fixé dans cette plaque à tubes.Reference 8 designates the tube plate and Reference 10 has a tube fixed in this tube plate.

Le tube 10a est surmonté par une pièce de tête 228. Cette pièce est fixée au tube par emmanchement forcé ou par soudage.The tube 10a is surmounted by a head piece 228. This piece is fixed to the tube by forced fitting or by welding.

Le dispositif d'injection comporte une canule 220 constituée par un tube comportant un conduit central 238 de section réduite et dont Le diamètre a été déterminé de manière que La vitesse du fluide secondaire soit toujours supérieure à 0,7 m/sec.The injection device comprises a cannula 220 constituted by a tube comprising a central duct 238 of reduced section and the diameter of which has been determined so that the speed of the secondary fluid is always greater than 0.7 m / sec.

L'homme du métier, connaissant Les caractéristiques du générateur de vapeur, et notamment Le débit de L'eau secondaire, est facilement à même de déterminer cette section du fait que Le produit du débit par La section de passage est constant.A person skilled in the art, knowing the characteristics of the steam generator, and in particular the flow rate of the secondary water, is easily able to determine this section because the product of the flow rate through the flow section is constant.

A son extrémité inférieure, La canule 220 comporte un divergent 222 permettant d'augmenter La section de passage offerte au fluide et par conséquent de réduire sa vitesse à une valeur faible, de manière à ne pas produire d'érosion dans Le coude du tube situé immédiatement à l'aval de La canule. La pièce rapportée par soudage, dans LaqueLLe est réalisé Le divergent 222 comporte extérieurement une partie conique 250 destinée au centrage et à l'immobilisation de La canule par rapport au tube 10a. A sa partie supérieure, La canule présente une partie filetée 260.At its lower end, the cannula 220 has a divergent 222 making it possible to increase the passage section offered to the fluid and consequently to reduce its speed to a low value, so as not to produce erosion in the bend of the tube located immediately downstream of La cannule. The insert by welding, in LaqueLLe is produced The divergent 222 externally comprises a conical part 250 intended for centering and immobilizing the cannula relative to the tube 10a. At its upper part, the cannula has a threaded part 260.

Une bague de serrage 262 est vissée sur La partie filetée 260. La bague 262 est immobilisée par un contre-écrou 264 arrêté en rotation de manière connue.A clamping ring 262 is screwed onto the threaded part 260. The ring 262 is immobilized by a lock nut 264 stopped in rotation in a known manner.

La canule 220 est entourée par un fourreau 220' qui comporte un épaulement extérieur 221'. Dans l'exemple représenté, La pièce sur LaqueLLe est réalisé l'épaulement 221' est rapportée par soudage sur La partie principale du fourreau.The cannula 220 is surrounded by a sheath 220 'which has an outer shoulder 221'. In the example shown, the part on LaqueLLe is made the shoulder 221 'is attached by welding to the main part of the sheath.

A sa partie inférieure, Le fourreau comporte une partie cylindrique de centrage 226' dont Le diamètre extérieur est voisin du diamètre intérieur du tube 10a. Le fourreau comporte encore un cône femelle 250' adapté à coopérer avec Le cône mâle 250 de La canule. Des fentes LongitudinaLes 224' sont pratiquées afin de donner une élasticité et permettre L'expansion de La partie conique 250'.At its lower part, the sheath has a cylindrical centering part 226 ′ whose external diameter is close to the internal diameter of the tube 10a. The sheath also has a female cone 250 'adapted to cooperate with the male cone 250 of the cannula. Longitudinal slots 224 'are made to give elasticity and allow the expansion of the conical part 250'.

La pièce de tête 228 comporte un épaulement intérieur destiné à L'appui de L'épauLement 221' du fourreau. Un bouchon 230 est vissé dans une partie fiLetée intérieure de La pièce de tête. Ce bouchon serre L'épauLement 221' sur La pièce de tête. Intérieurement, Le bouchon comporte un Logement pour un ressort hélicoidal 266 qui entoure La canule 220 et qui est situé entre Le bouchon 230 et La bague de serrage 262. Le ressort 266 a pour fonction d'assurer Le serrage et L'expansion de La partie conique 250' du fourreau.The head piece 228 has an internal shoulder intended to support the shoulder 221 ′ of the sheath. A plug 230 is screwed into an internal threaded part of the head piece. This cap tightens the shoulder 221 'on the head piece. Internally, the plug has a housing for a helical spring 266 which surrounds the cannula 220 and which is located between the plug 230 and the clamping ring 262. The spring 266 has the function of ensuring the tightening and expansion of the part. conical 250 'of the sheath.

Ce mode de réalisation présente L'avantage de permettre Le rattrapage des dilatations différentielles entre La canule et Le fourreau au moment de L'injection d'eau froide. De plus, Le déplacement reLatif de La canule par rapport au fourreau se fait Librement au niveau des pièces de tête et non pas sous contrainte de frottement dans Le tube 10a.This embodiment has the advantage of making it possible to compensate for the differential expansions between the cannula and the sheath at the time of cold water injection. In addition, the relative displacement of the cannula relative to the sheath is done freely at the level of the head pieces and not under friction stress in the tube 10a.

Claims (8)

1. Dispositif d'injection d'un fluide dans un tube comportant une canule (220) disposée dans Ledit tube, cette canule comportant, dans Le sens d'injection du fluide, un passage de section rétrécie suivi d'un divergent, caractérisé en ce que La canule (220) comporte un divergent (222), des moyens situés à La partie basse de La canule (220) pour La centrer et l'immobiliser en translation par rapport au tube 10a, un fourreau (220') entourant La canule.1. Device for injecting a fluid into a tube comprising a cannula (220) disposed in said tube, this cannula comprising, in the direction of injection of the fluid, a passage of narrowed section followed by a divergent, characterized in that the cannula (220) has a diverging portion (222), means located at the lower part of the cannula (220) for centering and immobilizing it in translation relative to the tube 10a, a sheath (220 ') surrounding the cannula. 2. Dispositif selon La revendication 1, caractérisé en ce que La section du passage (238) du fluide dans La canule (220) est telle que la vitesse dudit fluide est supérieure à 0,7 m/s.2. Device according to claim 1, characterized in that the section of the passage (238) of the fluid in the cannula (220) is such that the speed of said fluid is greater than 0.7 m / s. 3. Dispositif selon l'une quelconque des revendications 1 et 2, caractérisé en ce que Le fourreau (220') comporte au moins une fente (224').3. Device according to any one of claims 1 and 2, characterized in that the sheath (220 ') has at least one slot (224'). 4. Dispositif selon La revendication 1, caractérisé en ce que Les moyens, pour centrer et immobiliser en translation La canule sur Le tube (10a) sont constitués par une partie de centrage (226'), au moins une fente (224°) et un cône intérieur (250') formé dans Le fourreau, par un cône extérieur (250) formé à La partie basse de La canule (220), Les cônes (250) et (250') étant adaptés à coopérer, des moyens étant prévus pour appliquer élastiquement le cône extérieur (250) sur le cône intérieur (250').4. Device according to claim 1, characterized in that the means for centering and immobilizing in translation The cannula on the tube (10a) are constituted by a centering part (226 '), at least one slot (224 °) and an inner cone (250 ') formed in the sheath, by an outer cone (250) formed in the lower part of the cannula (220), the cones (250) and (250') being adapted to cooperate, means being provided to resiliently apply the outer cone (250) to the inner cone (250 '). 5. Dispositif selon la revendication 4, caractérisé en ce que les moyens pour appliquer Le cône (250) sur Le cône (250') sont constitués par des moyens d'arrêt situés à L'extrémité supérieure de La canule (220) et par un ressort (266) interposé entre Lesdits moyens d'arrêt et un bouchon (230) vissé sur La pièce de tête (238).5. Device according to claim 4, characterized in that the means for applying the cone (250) on the cone (250 ') are constituted by stop means located at the upper end of the cannula (220) and by a spring (266) interposed between said stop means and a plug (230) screwed onto the head piece (238). 6. Dispositif selon La revendication 5, caractérisé en ce que Lesdits moyens d'arrêt sont constitués par une bague de serrage (262) vissée sur une partie filetée (260) de la canule (220) et par un contre-écrou (264).6. Device according to claim 5, characterized in that said stop means are cons formed by a clamping ring (262) screwed onto a threaded part (260) of the cannula (220) and by a lock nut (264). 7. Générateur de vapeur comportant un dispositif d'injection selon l'une quelconque des revendications 1 à 5.7. Steam generator comprising an injection device according to any one of claims 1 to 5. 8. Générateur de vapeur comportant une enveLoppe (4), une plaque à tubes (8), située à L'intérieur de l'enveloppe (4) et divisant l'enveloppe en une boîte à eau (7) et une zone d'échange thermique, une entrée (4a), et une sortie (4b) pour un fluide primaire, situées dans La zone d'échange thermique de l'enveloppe, une entrée (14), et une sortie (18) pour un fluide secondaire, situées dans La boîte à eau, une pluralité de tubes (10) présentant une extrémité d'admission et une extrémité de sortie pour le fluide secondaire, Lesdites extrémités d'admission et de sortie étant fixées à La plaque à tubes, chaque tube (10) comportant une partie rectiligne (10a) du côté de son extrémité d'admission, un dispositif d'injection du fluide secondaire dans un tube (10) comportant un tube (220), appelé canule, disposé à L'intérieur de L'extrémité d'admission d'un tube (10) et comportant une section de passage pour Le fluide secondaire, caractérisé en ce que ladite section de passage de La canule est suivie, dans Le sens de La circulation du fluide secondaire, d'un divergent (222), un fourreau (220') étant disposé entre Ladite canule (220) et La partie rectiligne (10a) du tube (10), des moyens étant prévus pour centrer La canule (220) par rapport à La partie rectiligne (10a) du tube (10).8. Steam generator comprising an envelope (4), a tube plate (8), located inside the envelope (4) and dividing the envelope into a water box (7) and a zone of heat exchange, an inlet (4a), and an outlet (4b) for a primary fluid, located in the heat exchange zone of the envelope, an inlet (14), and an outlet (18) for a secondary fluid, located in the water box, a plurality of tubes (10) having an inlet end and an outlet end for the secondary fluid, said inlet and outlet ends being fixed to the tube plate, each tube (10 ) comprising a rectilinear part (10a) on the side of its intake end, a device for injecting the secondary fluid into a tube (10) comprising a tube (220), called a cannula, disposed inside the end inlet of a tube (10) and comprising a passage section for the secondary fluid, characterized in that said passage section of the cannula is s followed, in the direction of circulation of the secondary fluid, by a diverging portion (222), a sheath (220 ′) being disposed between said cannula (220) and the rectilinear part (10a) of the tube (10), means being intended to center the cannula (220) relative to the straight part (10a) of the tube (10).
EP85401000A 1984-05-29 1985-05-21 Liquid injection device in a tube and steam generator having such a device Expired EP0165846B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8408414 1984-05-29
FR8408414A FR2565322B1 (en) 1984-05-29 1984-05-29 DEVICE FOR INJECTING A LIQUID INTO A TUBE AND STEAM GENERATOR COMPRISING THIS DEVICE

Publications (2)

Publication Number Publication Date
EP0165846A1 true EP0165846A1 (en) 1985-12-27
EP0165846B1 EP0165846B1 (en) 1988-09-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401000A Expired EP0165846B1 (en) 1984-05-29 1985-05-21 Liquid injection device in a tube and steam generator having such a device

Country Status (5)

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US (1) US4721067A (en)
EP (1) EP0165846B1 (en)
JP (1) JPS60256702A (en)
DE (1) DE3565310D1 (en)
FR (1) FR2565322B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2694071B1 (en) * 1992-07-22 1994-10-14 Framatome Sa Method and device for adjusting a feed water flow rate in a tube of a steam generator.
CA2810994C (en) * 2010-09-09 2017-12-05 Certek Heat Machine Usa, Llc Dugout heating system

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DE554160C (en) * 1932-07-02 L & C Steinmueller Water tube boiler
DE1811596A1 (en) * 1968-01-15 1969-08-07 Waagner Biro Ag Process and device for comparative measurement of the heat transfer
GB1439413A (en) * 1972-10-16 1976-06-16 Mitsui Shipbuilding Eng Boilers
US4191246A (en) * 1979-03-05 1980-03-04 Combustion Engineering, Inc. Device to reduce local heat flux through a heat exchanger tube
DE2927977A1 (en) * 1979-06-20 1981-01-22 Bbc Brown Boveri & Cie HEAT EXCHANGER

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US3596638A (en) * 1968-10-15 1971-08-03 Siemens Ag Forced-flow steam generator to be heated by pressurized coolant of a nuclear reactor
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Publication number Priority date Publication date Assignee Title
DE554160C (en) * 1932-07-02 L & C Steinmueller Water tube boiler
DE1811596A1 (en) * 1968-01-15 1969-08-07 Waagner Biro Ag Process and device for comparative measurement of the heat transfer
GB1439413A (en) * 1972-10-16 1976-06-16 Mitsui Shipbuilding Eng Boilers
US4191246A (en) * 1979-03-05 1980-03-04 Combustion Engineering, Inc. Device to reduce local heat flux through a heat exchanger tube
DE2927977A1 (en) * 1979-06-20 1981-01-22 Bbc Brown Boveri & Cie HEAT EXCHANGER

Also Published As

Publication number Publication date
FR2565322A1 (en) 1985-12-06
US4721067A (en) 1988-01-26
FR2565322B1 (en) 1986-08-01
EP0165846B1 (en) 1988-09-28
DE3565310D1 (en) 1988-11-03
JPS60256702A (en) 1985-12-18

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