EP0441697A1 - Steam generator with a distributor, particularly for a nuclear-power plant - Google Patents

Steam generator with a distributor, particularly for a nuclear-power plant Download PDF

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Publication number
EP0441697A1
EP0441697A1 EP91400270A EP91400270A EP0441697A1 EP 0441697 A1 EP0441697 A1 EP 0441697A1 EP 91400270 A EP91400270 A EP 91400270A EP 91400270 A EP91400270 A EP 91400270A EP 0441697 A1 EP0441697 A1 EP 0441697A1
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EP
European Patent Office
Prior art keywords
pipes
steam generator
distributor
enclosure
generator according
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.)
Ceased
Application number
EP91400270A
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German (de)
French (fr)
Inventor
Patrick Sundheimer
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Areva NP SAS
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Framatome SA
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Publication of EP0441697A1 publication Critical patent/EP0441697A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • 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
    • F22B37/22—Drums; Headers; Accessories therefor
    • F22B37/228—Headers for distributing feedwater into steam generator vessels; Accessories therefor

Definitions

  • the invention relates to steam generators of the type comprising a pressure-resistance enclosure containing a bundle of exchange tubes and the upper part of which constitutes a steam balloon, enclosure in which a distributor is placed which is at least approximately toroidal in shape , connected to a supply line for drinking water passing through the wall of the enclosure and provided with distribution means intended for discharging the drinking water into the enclosure, constituted by nozzles in the butt connected to the upper generator of the distributor .
  • the invention finds a particularly important application in nuclear power plants which include a steam generator whose bundle of exchange tubes is traversed by the primary fluid of the reactor.
  • Document FR-A-2 333 200 (Westinghouse Electric Corporation) describes a generator in which, among the outlet pipes in the form of a butt or an inverted J which allow the dispenser to remain filled with drinking water, one at less, close to the water supply pipe, is shorter than the others and prevents steam from being trapped in the distributor.
  • the beam exchange tubes being in vertical hairpin shape with a "hot" inlet branch and a "cold” outlet branch, the tubes are distributed with a smaller interval on the portion of the distributor which surmounts the hot branch than on the portion of the distributor which overcomes the cold branch.
  • the great asymmetry of distribution of the openings makes this arrangement unfavorable to the resistance to fatigue of the toric distributor. Manufacturing is further complicated by the very close arrangement of the pipes above the hot branch.
  • the invention aims to provide a steam generator of the type defined above, whose exchange tubes have a cold branch and a hot branch which must be subjected to a more intense cooling than the other, responding better than those previously known to the requirements of the practice, in particular in that it does not have an asymmetry of distribution of the pipes and consequently has a better resistance to fatigue and a simpler manufacture.
  • the invention proposes in particular a generator characterized in that the stick pipes are distributed at equal angular intervals and have, at least locally, a different internal section according to their location on the distributor.
  • the pipes will generally have one or the other of two internal diameters, at the less over a fraction of their length, the tubes placed above the hot branches having the largest diameter, while the tubes placed above the cold branches have a smaller diameter.
  • the ratio of the flow rates to be supplied over the hot and cold branches is approximately 80/20, the ratio between the diameters can be 2/1.
  • the tubes are generally oriented radially, in alternating directions. This arrangement makes it possible to give the approximately toroidal distributor a smaller overall diameter than when the pipes are all directed inwards.
  • the possible reduction in diameter can be further increased by directing the outlet of the tubes in the butt stock not vertically, but obliquely, with a slope relative to the vertical generally between 5 ° and 30 °.
  • the steam generator shown in Figure 1 has a well-known general constitution, currently used in nuclear power plants with a pressurized water reactor. This general constitution appears for example in the document FR-A-2 333 200 already mentioned.
  • the exchanger comprises an enclosure 10 of resistance to pressure, containing a bundle of exchange tubes 12 in hairpin and the upper part of which constitutes a steam balloon fitted with a steam outlet pipe 14.
  • a distributor 16 of generally toric shape, which may or may not have lobes.
  • a pipe 18 for supplying edible water to the distributor 16 has a straight and horizontal part fixed to a sleeve (not shown) for crossing the enclosure 10. It is extended by a section 20 of connection with the distributor 16, forming a connection tee.
  • Line 18 is provided with a main supply which receives water, preheated or not, and an emergency water supply line, closed during normal operation (not shown).
  • connection tee 20 is fixed, for example by welding, on the one hand, to the supply pipe 18, on the other hand, at the ends of the distributor 16.
  • the supply pipe 18 or the portion of the tee placed in upstream of the arms for connection with the distributor 16 advantageously contains a deflector with helical blades of the kind described in document EP-A-0 210 895, which avoids or at least reduces the risk of water hammer.
  • Two butted tubes are advantageously provided on the connection tee 20. They have an inverted J shape whose jamb opens in the connection tee, at the level of the upper generator of the latter.
  • the two crooked tubes 22 are identical, but directed in opposite directions transversely to the median plane of the distributor 16, with a longitudinal offset.
  • These tubes can, conventionally, have a semicircle loop, as shown in Figure 3. But, as shown in Figure 3A, the loop of the J may not be complete, so that the direction of exit of the drinking water has a slope on the vertical which will then generally be between 5 and 30 ° and in particular allows the water streams to be directed in a direction such that they do not strike the wall of the connection tee 20.
  • the butt tubes 22 are placed downstream of the deflector, when a deflector is provided.
  • the distributor 16 is, in the embodiment shown, in the form of a ring of constant section, having a symmetry of revolution around an axis coincident with that of the enclosure 10.
  • the horizontal median plane of the distributor 16 is at the same level as that of the supply pipe 18 but its diameter is smaller, given that the flow rate supplied by the pipe is distributed between the two outputs of the connection tee 20.
  • the butt pipes are distributed at equal angular intervals on the distributor. These pipes, sixteen in number in the illustrated embodiment, all have an inverted J shape and are directed radially. But they have alternate meanings. Because of the protection provided by the deflector (or deflectors) placed in the connection tee 20 or in the pipe 18, it will often be possible to give the distributor the exactly toric shape shown in FIG. 2.
  • the pipes 24 placed above above the cold branches of the exchange tubes have an internal diameter d less than the internal diameter D of the pipes 26 which open above the hot branches. Often, a diameter D approximately equal to 2d will give good results. Often also, it will be possible to adopt for the internal diameter d0 tubing 22 a value equal to that of d .
  • the pipes 24 and 26 can have either a semicircular stock, or - as shown in Figures 4 and 5 - an incomplete stock, in the sense that the outlet is oriented so that the threads water coming out of the pipes have an inclination a on the vertical of between 5 ° and 30 °.
  • This arrangement makes it possible, due to the divergence of the flow from the distributor-tubing assembly, to give the distributor a diameter much smaller than that of the enclosure 10.
  • the tubing 22 replaces the tubing distributed circumferentially, on the connection tee 20.
  • the difference in cross-section between tubing may affect only part of the length of the tubing; all the tubes then have the same internal diameter, locally reduced by a diaphragm.
  • an end section of section adjustment is reported.
  • the end section 28 of FIG. 6 constitutes a ring with cylindrical external surface and converging internal surface fixed, for example by welding or brazing, on the end face of the tubing.
  • the end section of Figure 7 differs from the previous in that it comprises an annular lip 30 for welding to a similar lip provided on the tube.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

The steam generator, which can be used in a pressurised-water nuclear-power plant, comprises a pressure-resisting vessel (10) containing a bundle of heat-exchange tubes (12) and whose upper portion constitutes a steam drum, in which vessel is placed a distributor (16) of at least approximately toroidal shape, connected to a feedwater-inlet pipe (18) traversing the wall of the vessel and fitted with distribution means which are intended to discharge the feedwater into the vessel and are constituted by tail-hooked nozzles attached to the crown of the distributor. The tail-hooked nozzles (24, 26) are distributed at equal angular intervals and have, at least locally, a different internal cross-section depending on their position on the distributor (16). …<IMAGE>…

Description

L'invention concerne les générateurs de vapeur du type comprenant une enceinte de résistance à la pression contenant un faisceau de tubes d'échange et dont la partie supérieure constitue un ballon de vapeur, enceinte dans laquelle est placé un distributeur de forme au moins approximativement torique, relié à une conduite d'amenée d'eau alimentaire traversant la paroi de l'enceinte et muni de moyens de répartition destinés à déverser l'eau alimentaire dans l'enceinte, constitués par des tubulures en crosse raccordées à la génératrice supérieure du distributeur.The invention relates to steam generators of the type comprising a pressure-resistance enclosure containing a bundle of exchange tubes and the upper part of which constitutes a steam balloon, enclosure in which a distributor is placed which is at least approximately toroidal in shape , connected to a supply line for drinking water passing through the wall of the enclosure and provided with distribution means intended for discharging the drinking water into the enclosure, constituted by nozzles in the butt connected to the upper generator of the distributor .

L'invention trouve une application particulièrement importante dans les centrales nucléaires qui comportent un générateur de vapeur dont le faisceau de tubes d'échange est parcouru par le fluide primaire du réacteur.The invention finds a particularly important application in nuclear power plants which include a steam generator whose bundle of exchange tubes is traversed by the primary fluid of the reactor.

Lors du fonctionnement normal du réacteur, la surface libre de l'eau alimentaire dans l'enceinte est au-dessus de la conduite et du distributeur et la vitesse de l'eau dans la conduite est relativement élevée. Le fonctionnement est alors satisfaisant. Il peut au contraire être perturbé dans diverses conditions temporaires exceptionnellesDuring normal operation of the reactor, the free surface of the drinking water in the enclosure is above the pipe and the distributor and the speed of the water in the pipe is relatively high. Operation is then satisfactory. On the contrary, it can be disturbed under various exceptional temporary conditions

On a déjà proposé des générateurs de vapeur aménagés pour atténuer les perturbations. Le document FR-A-2 333 200 (Westinghouse Electric Corporation) décrit un générateur dans lequel, parmi les tubulures d'écoulement en forme de crosse ou de J renversé qui permettent au distributeur de rester rempli d'eau alimentaire, l'une au moins, proche de la conduite d'amenée d'eau, est plus courte que les autres et évite que de la vapeur ne soit emprisonnée dans le distributeur. Les tubes d'échange du faisceau étant en forme d'épingle à cheveux verticale avec une branche d'entrée "chaude" et une branche de sortie "froide", les tubulures sont réparties avec un intervalle plus faible sur la portion du distributeur qui surmonte la branche chaude que sur la portion du distributeur qui surmonte la branche froide. La grande dissymétrie de répartition des ouvertures rend cette disposition défavorable à la résistance à la fatigue du distributeur torique. La fabrication est par ailleurs compliquée par la disposition très rapprochée des tubulures au-dessus de la branche chaude.Steam generators have already been proposed to mitigate disturbances. Document FR-A-2 333 200 (Westinghouse Electric Corporation) describes a generator in which, among the outlet pipes in the form of a butt or an inverted J which allow the dispenser to remain filled with drinking water, one at less, close to the water supply pipe, is shorter than the others and prevents steam from being trapped in the distributor. The beam exchange tubes being in vertical hairpin shape with a "hot" inlet branch and a "cold" outlet branch, the tubes are distributed with a smaller interval on the portion of the distributor which surmounts the hot branch than on the portion of the distributor which overcomes the cold branch. The great asymmetry of distribution of the openings makes this arrangement unfavorable to the resistance to fatigue of the toric distributor. Manufacturing is further complicated by the very close arrangement of the pipes above the hot branch.

On connaît également (demande de brevet FR n° 87 13296 de la demanderesse) un générateur de vapeur qui se différencie notamment du précédent en ce que les tubulures ont une paroi entaillée hors du distributeur torique, ce qui permet d'éviter les coups de bélier dans la conduite d'amenée d'eau alimentaire. Ce document ne traite pas du problème posé par la présence de branches chaudes et de branches froides des tubes d'échange.There is also known (patent application FR n ° 87 13296 from the applicant) a steam generator which differs in particular from the previous one in that the pipes have a notched wall outside the toric distributor, which makes it possible to avoid water hammer in the water supply line. This document does not deal with the problem posed by the presence of hot branches and cold branches of the exchange tubes.

L'invention vise à fournir un générateur de vapeur du type ci-dessus défini, dont les tubes d'échange présentent une branche froide et une branche chaude qui doit être soumise à un refroidissement plus intense que l'autre, répondant mieux que ceux antérieurement connus aux exigences de la pratique, notamment en ce qu'il ne présente pas de dissymétrie de répartition des tubulures et a en conséquence une meilleure résistance à la fatigue et une fabrication plus simple.The invention aims to provide a steam generator of the type defined above, whose exchange tubes have a cold branch and a hot branch which must be subjected to a more intense cooling than the other, responding better than those previously known to the requirements of the practice, in particular in that it does not have an asymmetry of distribution of the pipes and consequently has a better resistance to fatigue and a simpler manufacture.

Dans ce but, l'invention propose notamment un générateur caractérisé en ce que les tubulures en crosse sont réparties à intervalles angulaires égaux et présentent, au moins localement, une section intérieure différente selon leur emplacement sur le distributeur.To this end, the invention proposes in particular a generator characterized in that the stick pipes are distributed at equal angular intervals and have, at least locally, a different internal section according to their location on the distributor.

Dans la pratique, les tubulures auront généralement l'un ou l'autre de deux diamètres intérieurs, au moins sur une fraction de leur longueur, les tubulures placées au-dessus des branches chaudes ayant le diamètre le plus important, tandis que les tubulures placées au-dessus des branches froides ont un diamètre plus faible. Lorsque, ce qui est fréquemment le cas, le rapport des débits à fournir au-dessus des branches chaudes et froides est de 80/20 environ, le rapport entre les diamètres peut être de 2/1.In practice, the pipes will generally have one or the other of two internal diameters, at the less over a fraction of their length, the tubes placed above the hot branches having the largest diameter, while the tubes placed above the cold branches have a smaller diameter. When, which is frequently the case, the ratio of the flow rates to be supplied over the hot and cold branches is approximately 80/20, the ratio between the diameters can be 2/1.

Les tubulures sont en règle générale orientées radialement, dans des sens alternés. Cette disposition permet de donner au distributeur approximativement torique un diamètre hors tout plus faible que lorsque les tubulures sont toutes dirigées vers l'intérieur. La diminution possible de diamètre peut encore être accrue en dirigeant le débouché des tubulures en crosse non pas verticalement, mais obliquement, avec une pente par rapport à la verticale généralement comprise entre 5° et 30°.The tubes are generally oriented radially, in alternating directions. This arrangement makes it possible to give the approximately toroidal distributor a smaller overall diameter than when the pipes are all directed inwards. The possible reduction in diameter can be further increased by directing the outlet of the tubes in the butt stock not vertically, but obliquely, with a slope relative to the vertical generally between 5 ° and 30 °.

L'invention sera mieux comprise à la lecture de la description qui suit d'un mode particulier de réalisation de l'invention, donné à titre d'exemple non limitatif. La description se réfère aux dessins qui l'accompagnent, dans lesquels :

  • la Figure 1 est une vue en perspective d'une fraction d'un générateur de vapeur conforme à l'invention ;
  • la Figure 2 est une vue en plan du distributeur d'eau alimentaire et de la conduite d'alimentation équipant le générateur de la Figure 1 ;
  • les Figures 3, 4 et 5 sont des vues schématiques en coupe suivant les lignes III-III, IV-IV et V-V de la Figure 2 ;
  • la Figure 3A, similaire à la Figure 3, montre une variante de réalisation ;
  • les Figures 6 et 7, similaires à la Figure 3A, montre d'autres variantes.
The invention will be better understood on reading the following description of a particular embodiment of the invention, given by way of non-limiting example. The description refers to the accompanying drawings, in which:
  • Figure 1 is a perspective view of a fraction of a steam generator according to the invention;
  • Figure 2 is a plan view of the food water dispenser and the supply line fitted to the generator of Figure 1;
  • Figures 3, 4 and 5 are schematic sectional views along lines III-III, IV-IV and VV of Figure 2;
  • Figure 3A, similar to Figure 3, shows an alternative embodiment;
  • Figures 6 and 7, similar to Figure 3A, show other variants.

Le générateur de vapeur montré en Figure 1 a une constitution générale bien connue, utilisée à l'heure actuelle dans les centrales nucléaires comportant un réacteur à eau sous pression. Cette constitution générale apparaît par exemple dans le document FR-A-2 333 200 déjà mentionné L'échangeur comprend une enceinte 10 de résistance à la pression, contenant un faisceau de tubes d'échange 12 en épingle à cheveux et dont la partie supérieure constitue un ballon de vapeur muni d'une tubulure 14 de sortie de vapeur. Dans l'enceinte est placée un distributeur 16 de forme générale torique, pouvant ou non présenter des lobes. Une conduite 18 d'amenée d'eau alimentaire au distributeur 16 présente une partie droite et horizontale fixée à un manchon (non représenté) de traversée de l'enceinte 10. Elle se prolonge par un tronçon 20 de liaison avec le distributeur 16, formant un té de raccordement. La conduite 18 est munie d'une alimentation principale qui reçoit de l'eau, préchauffée ou non, et une conduite d'amenée d'eau de secours, fermée en fonctionnement normal (non représentées).The steam generator shown in Figure 1 has a well-known general constitution, currently used in nuclear power plants with a pressurized water reactor. This general constitution appears for example in the document FR-A-2 333 200 already mentioned. The exchanger comprises an enclosure 10 of resistance to pressure, containing a bundle of exchange tubes 12 in hairpin and the upper part of which constitutes a steam balloon fitted with a steam outlet pipe 14. In the enclosure is placed a distributor 16 of generally toric shape, which may or may not have lobes. A pipe 18 for supplying edible water to the distributor 16 has a straight and horizontal part fixed to a sleeve (not shown) for crossing the enclosure 10. It is extended by a section 20 of connection with the distributor 16, forming a connection tee. Line 18 is provided with a main supply which receives water, preheated or not, and an emergency water supply line, closed during normal operation (not shown).

Le té de raccordement 20 est fixé, par exemple par soudage, d'une part, à la conduite d'amenée 18, d'autre part, aux extrémités du distributeur 16. La conduite d'amenée 18 ou la portion du té placé en amont des bras de raccordement avec le distributeur 16 contient avantageusement un déflecteur à aubes hélicoïdales du genre décrit dans le document EP-A-0 210 895, qui évite ou au moins diminue le risque de coup de bélier. Deux tubes en crosse sont avantageusement prévus sur le té de raccordement 20. Ils ont une forme en J renversé dont le jambage s'ouvre dans le té de raccordement, au niveau de la génératrice supérieure de ce dernier. Les deux tubes en crosse 22 sont identiques, mais dirigés dans des sens opposés transversalement au plan médian du distributeur 16, avec un décalage longitudinal. Ces tubes peuvent, classiquement, avoir une boucle en demi-cercle, comme indiqué sur la Figure 3. Mais, comme indiqué en Figure 3A, la boucle du J peut n'être pas complète, pour que la direction de sortie de l'eau alimentaire présente une pente sur la verticale qui sera alors généralement comprise entre 5 et 30° et permette notamment de diriger les filets d'eau dans une direction telle qu'ils ne viennent pas frapper la paroi du té de raccordement 20.The connection tee 20 is fixed, for example by welding, on the one hand, to the supply pipe 18, on the other hand, at the ends of the distributor 16. The supply pipe 18 or the portion of the tee placed in upstream of the arms for connection with the distributor 16 advantageously contains a deflector with helical blades of the kind described in document EP-A-0 210 895, which avoids or at least reduces the risk of water hammer. Two butted tubes are advantageously provided on the connection tee 20. They have an inverted J shape whose jamb opens in the connection tee, at the level of the upper generator of the latter. The two crooked tubes 22 are identical, but directed in opposite directions transversely to the median plane of the distributor 16, with a longitudinal offset. These tubes can, conventionally, have a semicircle loop, as shown in Figure 3. But, as shown in Figure 3A, the loop of the J may not be complete, so that the direction of exit of the drinking water has a slope on the vertical which will then generally be between 5 and 30 ° and in particular allows the water streams to be directed in a direction such that they do not strike the wall of the connection tee 20.

Les tubes en crosse 22 sont placés en aval du déflecteur, lorsqu'un déflecteur est prévu.The butt tubes 22 are placed downstream of the deflector, when a deflector is provided.

Le distributeur 16 se présente, dans le mode de réalisation représenté, sous forme d'un anneau à section constante, ayant une symétrie de révolution autour d'un axe confondu avec celui de l'enceinte 10. Le plan horizontal médian du distributeur 16 est au même niveau que celui de la conduite d'amenée 18 mais son diamètre est plus faible, étant donné que le débit amené par la conduite se répartit entre les deux sorties du té de raccordement 20.The distributor 16 is, in the embodiment shown, in the form of a ring of constant section, having a symmetry of revolution around an axis coincident with that of the enclosure 10. The horizontal median plane of the distributor 16 is at the same level as that of the supply pipe 18 but its diameter is smaller, given that the flow rate supplied by the pipe is distributed between the two outputs of the connection tee 20.

Les tubulures en crosse sont réparties à intervalles angulaires égaux sur le distributeur. Ces tubulures, au nombre de seize dans le mode de réalisation illustré, ont toutes une forme en J renversé et sont dirigées radialement. Mais elles ont des sens alternés. Du fait de la protection assurée par le déflecteur (ou les déflecteurs) placés dans le té de raccordement 20 ou dans la conduite 18, il sera souvent possible de donner au distributeur la forme exactement torique montrée en Figure 2. Les tubulures 24 placées au-dessus des branches froides des tubes d'échange ont un diamètre interne d inférieur au diamètre interne D des tubulures 26 qui débouchent au-dessus des branches chaudes. Souvent, un diamètre D approximativement égal à 2d donnera de bons résultats. Souvent également, il sera possible d'adopter pour le diamètre interne d0 des tubulures 22 une valeur égale à celle de d.The butt pipes are distributed at equal angular intervals on the distributor. These pipes, sixteen in number in the illustrated embodiment, all have an inverted J shape and are directed radially. But they have alternate meanings. Because of the protection provided by the deflector (or deflectors) placed in the connection tee 20 or in the pipe 18, it will often be possible to give the distributor the exactly toric shape shown in FIG. 2. The pipes 24 placed above above the cold branches of the exchange tubes have an internal diameter d less than the internal diameter D of the pipes 26 which open above the hot branches. Often, a diameter D approximately equal to 2d will give good results. Often also, it will be possible to adopt for the internal diameter d0 tubing 22 a value equal to that of d .

Comme les tubulures 22, les tubulures 24 et 26 peuvent avoir soit une crosse en demi-cercle, soit - comme indiqué sur les Figures 4 et 5 - une crosse incomplète, en ce sens que le débouché est orienté de façon que les filets d'eau qui sortent des tubulures aient une inclinaison a sur la verticale comprise entre 5° et 30°. Cette disposition permet, du fait de la divergence de l'écoulement à partir de l'ensemble distributeur-tubulure, de donner au distributeur un diamètre nettement inférieur à celui de l'enceinte 10. Les tubulures 22 se substituent aux tubulures réparties circonférentiellement, sur le té de raccordement 20.Like the pipes 22, the pipes 24 and 26 can have either a semicircular stock, or - as shown in Figures 4 and 5 - an incomplete stock, in the sense that the outlet is oriented so that the threads water coming out of the pipes have an inclination a on the vertical of between 5 ° and 30 °. This arrangement makes it possible, due to the divergence of the flow from the distributor-tubing assembly, to give the distributor a diameter much smaller than that of the enclosure 10. The tubing 22 replaces the tubing distributed circumferentially, on the connection tee 20.

Comme le montrent les Figures 3, 3A, 4 et 5, le point haut de chacune des tubulures 22, 24 et 26 est au même niveau, quelle que soit la section droite du composant auquel elle est fixée.As shown in Figures 3, 3A, 4 and 5, the top point of each of the pipes 22, 24 and 26 is at the same level, regardless of the cross section of the component to which it is fixed.

Pour standardiser davantage les tubulures et réduire le nombre de modèles, la différence de section entre tubulures peut n'affecter qu'une partie de la longueur des tubulures ; toutes les tubulures ont alors le même diamètre interne, réduit localement par un diaphragme. Dans le cas illustré sur les Figures 6 et 7, un tronçon terminal de réglage de section est rapporté. Le tronçon terminal 28 de la Figure 6 constitue un anneau à surface externe cylindrique et surface interne convergente fixé, par exemple par soudage ou brasage, sur la face terminale de la tubulure. Le tronçon terminal de la Figure 7 se différencie du précédent en ce qu'il comporte une lèvre annulaire 30 de soudage à une lèvre similaire prévue sur la tubulure.To further standardize the tubing and reduce the number of models, the difference in cross-section between tubing may affect only part of the length of the tubing; all the tubes then have the same internal diameter, locally reduced by a diaphragm. In the case illustrated in Figures 6 and 7, an end section of section adjustment is reported. The end section 28 of FIG. 6 constitutes a ring with cylindrical external surface and converging internal surface fixed, for example by welding or brazing, on the end face of the tubing. The end section of Figure 7 differs from the previous in that it comprises an annular lip 30 for welding to a similar lip provided on the tube.

Claims (6)

Générateur de vapeur comprenant une enceinte (10) de résistance à la pression contenant un faisceau de tubes d'échange (12) et dont la partie supérieure constitue un ballon de vapeur, enceinte dans laquelle est placé un distributeur (16) de forme au moins approximativement torique, relié à une conduite (18) d'amenée d'eau alimentaire traversant la paroi de l'enceinte et muni de moyens de répartition destinés à déverser l'eau alimentaire dans l'enceinte, constitués par des tubulures en crosse raccordées à la génératrice supérieure du distributeur, caractérisé en ce que les tubulures en crosse (24, 26) sont réparties à intervalles angulaires égaux et présentent, au moins localement, une section intérieure différente selon leur emplacement sur le distributeur (16).Steam generator comprising a pressure resistance enclosure (10) containing a bundle of exchange tubes (12) and the upper part of which constitutes a steam balloon, enclosure in which a distributor (16) of at least shape is placed approximately toroidal, connected to a pipe (18) for supplying edible water passing through the wall of the enclosure and provided with distribution means intended for pouring edible water into the enclosure, constituted by stick pipes connected to the upper generator of the dispenser, characterized in that the butt-end pipes (24, 26) are distributed at equal angular intervals and have, at least locally, a different internal section depending on their location on the dispenser (16). Générateur de vapeur selon la revendication 1, caractérisé en ce que les tubulures (26) placées au-dessus des branches chaudes ont un diamètre interne à peu près double de celui des autres tubulures (24).Steam generator according to claim 1, characterized in that the pipes (26) placed above the hot branches have an internal diameter approximately twice that of the other pipes (24). Générateur de vapeur selon la revendication 1, caractérisé en ce que toutes les tubulures ont le même diamètre interne, sauf dans un embout terminal rapporté (28).Steam generator according to claim 1, characterized in that all the pipes have the same internal diameter, except in an attached end piece (28). Générateur de vapeur selon la revendication 3, caractérisé en ce que l'embout terminal a une surface interne convergeant vers la sortie.Steam generator according to claim 3, characterized in that the end fitting has an internal surface converging towards the outlet. Générateur de vapeur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les tubulures sont orientées radialement, dans des sens alternés.Steam generator according to any one of claims 1 to 4, characterized in that the pipes are oriented radially, in alternating directions. Générateur de vapeur selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le débouché des tubulures en crosse est oblique avec une pente par rapport à la verticale généralement comprise entre 5° et 30°.Steam generator according to any one of claims 1 to 5, characterized in that the outlet of the stick pipes is oblique with a slope with respect to the vertical generally between 5 ° and 30 °.
EP91400270A 1990-02-08 1991-02-05 Steam generator with a distributor, particularly for a nuclear-power plant Ceased EP0441697A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9001472 1990-02-08
FR9001472A FR2657948B1 (en) 1990-02-08 1990-02-08 STEAM GENERATOR WITH DISTRIBUTOR, PARTICULARLY FOR NUCLEAR POWER PLANT.

Publications (1)

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EP0441697A1 true EP0441697A1 (en) 1991-08-14

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EP91400270A Ceased EP0441697A1 (en) 1990-02-08 1991-02-05 Steam generator with a distributor, particularly for a nuclear-power plant

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US (1) US5083529A (en)
EP (1) EP0441697A1 (en)
JP (1) JPH05157202A (en)
KR (1) KR910015816A (en)
CN (1) CN1063927A (en)
CA (1) CA2035766A1 (en)
FR (1) FR2657948B1 (en)
ZA (1) ZA91915B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0640792A2 (en) * 1993-08-02 1995-03-01 Westinghouse Electric Corporation Secondary fluid supply system for a steam generator

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5350011A (en) * 1993-08-02 1994-09-27 Westinghouse Electric Corporation Device and method for thermally insulating a structure to prevent thermal shock therein
FR2851031B1 (en) * 2003-02-12 2005-05-06 Framatome Anp STEAM GENERATOR COMPRISING A FEED WATER SUPPLY DEVICE PROVIDING TRAPPING OF FOREIGN BODIES
FR2853047B1 (en) * 2003-03-31 2005-06-24 Framatome Anp STEAM GENERATOR COMPRISING A RELIEF WATER SUPPLY DEVICE
JP2012220077A (en) * 2011-04-07 2012-11-12 Mitsubishi Heavy Ind Ltd Water supply pipe for steam generator

Citations (3)

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Publication number Priority date Publication date Assignee Title
US4037569A (en) * 1976-01-30 1977-07-26 Westinghouse Electric Corporation Flow distribution arrangement for a steam generator
EP0035450A1 (en) * 1980-02-29 1981-09-09 Framatome Preheating steam generator
EP0161894A2 (en) * 1984-05-14 1985-11-21 Westinghouse Electric Corporation Discharge tube for inhibiting stratification in feedwater headers of a steam generator

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US3991720A (en) * 1975-01-29 1976-11-16 Westinghouse Electric Corporation J tube discharge or feedwater header
SE465591B (en) * 1987-05-22 1991-09-30 Asea Atom Ab VEHICLE GENERATOR WITH UN-FORMED TUBKNIPPEN TO BE USED IN A PRESSURE WATER REACTOR

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4037569A (en) * 1976-01-30 1977-07-26 Westinghouse Electric Corporation Flow distribution arrangement for a steam generator
EP0035450A1 (en) * 1980-02-29 1981-09-09 Framatome Preheating steam generator
EP0161894A2 (en) * 1984-05-14 1985-11-21 Westinghouse Electric Corporation Discharge tube for inhibiting stratification in feedwater headers of a steam generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0640792A2 (en) * 1993-08-02 1995-03-01 Westinghouse Electric Corporation Secondary fluid supply system for a steam generator
EP0640792A3 (en) * 1993-08-02 1995-06-28 Westinghouse Electric Corp Secondary fluid supply system for a steam generator.

Also Published As

Publication number Publication date
US5083529A (en) 1992-01-28
ZA91915B (en) 1991-12-24
CN1063927A (en) 1992-08-26
CA2035766A1 (en) 1991-08-09
FR2657948A1 (en) 1991-08-09
FR2657948B1 (en) 1992-05-29
JPH05157202A (en) 1993-06-22
KR910015816A (en) 1991-09-30

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