EP0287422A1 - Strut grid for cross-supporting the tubes of a heat exchanger tube bundle and assembling process of such a strut grid - Google Patents

Strut grid for cross-supporting the tubes of a heat exchanger tube bundle and assembling process of such a strut grid Download PDF

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Publication number
EP0287422A1
EP0287422A1 EP88400777A EP88400777A EP0287422A1 EP 0287422 A1 EP0287422 A1 EP 0287422A1 EP 88400777 A EP88400777 A EP 88400777A EP 88400777 A EP88400777 A EP 88400777A EP 0287422 A1 EP0287422 A1 EP 0287422A1
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EP
European Patent Office
Prior art keywords
tubes
hoops
branches
jumpers
spacer grid
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
EP88400777A
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German (de)
French (fr)
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EP0287422B1 (en
Inventor
Philippe Schutzenberger
Gérard Stalport
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Areva NP SAS
Original Assignee
Novatome SA
Framatome SA
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Publication date
Application filed by Novatome SA, Framatome SA filed Critical Novatome SA
Publication of EP0287422A1 publication Critical patent/EP0287422A1/en
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Publication of EP0287422B1 publication Critical patent/EP0287422B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0133—Auxiliary supports for elements for tubes or tube-assemblies formed by concentric strips

Definitions

  • the invention relates to a spacer grid for transversely holding the tubes of the bundle of a heat exchanger.
  • Heat exchangers are known which are used as standby heat exchangers for cooling the primary fluid of a nuclear reactor.
  • emergency heat exchangers are provided which are used for cooling the reactor after a shutdown following an incident, in particular in the failure of the main cooling circuit.
  • Such emergency exchangers are immersed in the primary sodium filling the reactor vessel and comprise a bundle of tubes inside which secondary sodium circulates ensuring the cooling of the primary sodium by heat exchange through the wall of the tubes.
  • the secondary sodium is itself cooled outside the reactor vessel, in a sodium-air exchanger.
  • the exchanger comprises a bundle of tubes which is immersed, vertically, over part of its height, in the primary liquid sodium filling the reactor vessel.
  • the bundle tubes each have an inlet end attached to a first tubular plate and an outlet end attached to a second tubular plate.
  • the two tubu plates laires are arranged in the same plane and have the same vertical axis which corresponds to the vertical axis of the beam.
  • One of the plates located at the central part of the beam is circular and the other plate, located at the peripheral part, is annular.
  • the tubes consist, over most of their length, by rectilinear and parallel branches which are arranged vertically, when the bundle is in place in the nuclear reactor vessel.
  • the bundle is of substantially circular section and has an axis parallel to the rectilinear branches of the tubes passing through the center of successive straight sections of the bundle in which the tubes are distributed in a regular network.
  • spacer grids are parallel to the tubular plates and substantially reproduce the network formed by the holes for the passage of the tubes in the tubular plates.
  • Such spacer grids are constituted by circular hoops of constant height and of radius increasing towards the outside arranged coa xially so that two successive hoops delimit an annular row of substantially constant width.
  • Elastic sheet metal devices are arranged in each of the annular rows and are fixed, on the one hand to the inner hoop and on the other hand to the outer hoop delimiting the row.
  • the elastic devices therefore ensure the assembly of the hoops constituting the spacer grid.
  • the elastic devices include housings for receiving the tubes and ensuring their transverse maintenance.
  • the elastic devices consist of a continuous metal band folded in a sinusoidal fashion and put in the form of a crown having a crenellated section providing successive housings for the tubes.
  • the shaping by folding of the crenellated crown a priori defines the relative arrangement of the tubes in the corresponding annular row. This therefore results in a lack of flexibility as to the arrangement of the tubes in the rows, when the beam is put in place.
  • the tubes are produced and shaped so as to have a perfectly defined geometry, their positioning in the cross sections can present some difficulties if their relative arrangement is defined a priori. This is particularly so because of the very long length of the bundle tubes.
  • each spacer grid has an internal part intended to receive the branches of the tubes connected to the central circular tubular plate and an external part intended to receive the branches of the tubes connected to the plate tu external annular bular.
  • the internal part of the spacer grids is assembled, the assembly of the external part being carried out at the time of the assembly of the tubes of the bundle which are placed successively in the annular rows of the spacer grids.
  • This mounting of the external part of the spacer grids during advancement requires being able to adapt the elastic devices for holding the tubes to the exact position of these tubes at the time of assembly.
  • the realization of the elastic devices in the form of a corrugated metal band and wound in a crown does not allow this adaptation to be easily ensured.
  • the object of the invention is therefore to propose a spacer grid for transversely holding the tubes of the bundle of a heat exchanger which are arranged with their axes parallel and held transversely to form a regular network in planes perpendicular to the axes, by spacer grids spaced along the axial direction of the beam and each constituted by a set of circular hoops having a common axis parallel to the tubes and by elastic devices for holding the tubes each fixed between two successive inner and outer hoops, respectively, ensuring the connection between the hoops and the holding of the tubes in an annular row between the two successive hoops, this spacer grid being able to be adapted to the exact position of the tubes of the bundle and being able to be easily mounted, in particular during advancement.
  • the elastic tube holding devices each consist of a set of U-shaped jumpers arranged successively in an annular row and each comprising two branches providing between them a housing for a tube and a common connecting part, the branches being welded at their free ends to the outer hoop and the common part to the inner hoop.
  • This spacer grid is constituted by circular hoops of constant height and of radius increasing towards the outside arranged so as to all have for axis the axis of the heat exchanger bundle, this axis having for trace the point 0 on the plan of figure 1.
  • the hoops of the spacer grid constitute a first internal assembly formed by the six hoops 1a, 1b, 1c, 1d, 1e, 1f and a second external assembly constituted by the four hoops 2a, 2b, 2c and 2d.
  • the hoops of the first set delimit annular rows 5 intended to receive the branches of the tubes 4 connected to the central tubular plate of the bundle of circular shape.
  • the hoops of the second set delimit annular rows 5 ⁇ intended to receive the branches of the tubes 4 connected to the outer tubular plate of annular shape of the heat exchanger.
  • the outer hoop 1f of the first assembly and the inner hoop 2a of the second assembly are connected together by means of pairs of parts 6, 6 ⁇ delimiting between them a space of cylindrical shape and each welded on the one hand to the hoop 1f and on the other hand to the hoop 2a.
  • a sheath 7 is fixed to each of the pairs of parts 6, 6 ⁇ , in the cylindrical space formed between these parts.
  • Vertical tie rods can be fixed inside the sleeves 7, to ensure the suspension of the spacer grid at the top of the heat exchanger, as described in patent application 2,568,363. Each of the tie rods is engaged in the sleeves of the different spacer grids placed according to the height of the beam.
  • each of the jumpers 8 having the general shape of a U has two branches 8a and 8b and a common part 8c for connection between the branches 8a and 8b.
  • Each of the branches 8a and 8b is folded outwards so as to constitute a housing 10 of flared shape for a tube 4 of the bundle.
  • the interior space of the rider thus comprises a part of small width close to the common connecting part 8c and a part close to the opening of the U of greater width, this part being connected to the part of small width by two inclined parts. branches 8a and 8b produced by folding.
  • the width of the jumper opening is greater than the outside diameter of the tubes 4 of the bundle, while the smaller width inside part of the jumper has a dimension less than the diameter of the tube 4.
  • the inclined intermediate parts of the branches 8a and 8b ensure the 'support and centering of the tube 4.
  • the branches 8a and 8b of the jumper 8 have at their end corresponding to the opening of the jumper, welding tabs 9a and 9b folded 90 ° outwards.
  • the jumpers 8 are welded to the corresponding ribs 1 or 2, on the one hand by means of their by common tie 8c and on the other hand via the legs 9a and 9b.
  • the welds are made on edge, at the lower edge and the upper edge of the corresponding hoops.
  • the weld zones extend only over a small height of the hoop, the remaining part of the contact zone between the rider and the hoops having no weld connection.
  • the inclination of the welding lugs 9a and 9b of the hoops 8 is adapted to the radius of curvature of the hoop on which these lugs are fixed.
  • the jumpers are fixed by the end of their branches on the inner surface of the outer hoop limiting the row where they are arranged and by their common part on the outer surface of the inner hoop limiting the row.
  • the spacer grids were made for an emergency heat exchanger of a fast neutron nuclear reactor cooled by liquid sodium.
  • the spacer grids are formed by stainless steel hoops whose height is 35 mm and the thickness of 1 mm.
  • the mounting of the spacer grids and of the bundle tubes can be carried out according to the method described in patent application 2,568,363.
  • the hoops 1a, 1b, 1c, 1d, 1e, 1f constituting the inner part of the spacer grid are first assembled using jumpers 8 arranged in the rows, one after the other with a substantially constant spacing. This spacing can however be adjusted as a function of the exact position of the branches of the tubes connected to the central part of the tube plate.
  • the jumpers 8 are fixed to the hoops 1, inside the annular rows 5, by TIG welds on edge, at the upper edge and at the lower edge of the corresponding hoops, that is to say by the above and below these hoops (flat and ceiling welding). This edge welding operation can be carried out quickly and without particular difficulties.
  • the outer rings 2 constituting the annular rows 5 ⁇ are then put in place, at the time of assembly of the bundle tubes.
  • the tubes 4, one of the branches of which is placed in a row 5 ⁇ of the external part of the spacer grid are placed in the internal part of the grids and in the central part of the tube plate.
  • the external part of the spacer grid is then produced during advancement.
  • the hoops 2a, 2b and 2c are formed in advance by welding the jumpers 8 on their common parts 8c.
  • the hoops thus formed are placed before threading the corresponding row of tubes.
  • the next hoop is placed by welding parts 9a and 9b of the jumpers of the previous hoop.
  • the position differences of the tubes are taken up before welding by pinching the jumpers, to ensure their correct positioning.
  • the jumpers 8 are set up very precisely and without difficulty.
  • the mounting of the spacer grid can therefore be carried out quickly and without difficulty, the spacer grid being also perfectly suited to the configuration of the beam.
  • jumpers of a shape different from that which has been described from the moment when these jumpers have two branches which can be connected to the outer hoop and a common part which can be connected to the inner hoop as well as an internal space reserving a housing for a tube 4 whose jumper 8 provides transverse support preventing any movement or any vibration in service.
  • the hoops and the jumpers can be made of any metallic material compatible with the conditions of use and the fluids used in the heat exchanger.
  • a spacer grid according to the invention can be used in any heat exchanger comprising a bundle of parallel tubes arranged in coaxial annular rows.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

The strut grid consists of circular hoops (1, 2) with a common axis arranged so as to define annular rows (5, 5') of roughly constant width. Supporting brackets (8) made from a metal sheet folded into a U shape are each welded to two successive hoops and provide for their assembly. The supporting brackets (8) also hold the tubes (4) which are engaged in an inner housing defined by the arms of the supporting brackets (8). Application especially to emergency heat exchangers in fast neutron nuclear reactors cooled by liquid sodium. <IMAGE>

Description

L'invention concerne une grille entretoise de maintien transversal des tubes du faisceau d'un échangeur de chaleur.The invention relates to a spacer grid for transversely holding the tubes of the bundle of a heat exchanger.

On connaît des échangeurs de chaleur qui sont utilisés comme échangeurs de chaleur de secours pour le refroidissement du fluide primaire d'un réac­teur nucléaire. En particulier, dans les réacteurs nucléaires à neutrons rapides de type intégré qui sont refroidis par du sodium liquide, on prévoit des échan­geurs de chaleur de secours qui sont utilisés pour le refroidissement du réacteur après un arrêt consécutif à un incident, en particulier, dans le cas où le cir­cuit principal de refroidissement est défaillant. De tels échangeurs de secours sont plongés dans le sodium primaire remplissant la cuve du réacteur et comportent un faisceau de tubes à l'intérieur desquels circule du sodium secondaire assurant le refroidissement du so­dium primaire par échange thermique à travers la paroi des tubes. Le sodium secondaire est lui-même refroidi à l'extérieur de la cuve du réacteur, dans un échan­geur sodium-air.Heat exchangers are known which are used as standby heat exchangers for cooling the primary fluid of a nuclear reactor. In particular, in integrated type fast neutron nuclear reactors which are cooled by liquid sodium, emergency heat exchangers are provided which are used for cooling the reactor after a shutdown following an incident, in particular in the failure of the main cooling circuit. Such emergency exchangers are immersed in the primary sodium filling the reactor vessel and comprise a bundle of tubes inside which secondary sodium circulates ensuring the cooling of the primary sodium by heat exchange through the wall of the tubes. The secondary sodium is itself cooled outside the reactor vessel, in a sodium-air exchanger.

De tels échangeurs de secours doivent pou­voir fonctionner même si les sources d'énergie asso­ciées au réacteur nucléaire, en particulier les ali­mentations électriques, sont devenues indisponibles.Such emergency exchangers must be able to function even if the energy sources associated with the nuclear reactor, in particular the electrical supplies, have become unavailable.

Un tel échangeur de secours a été décrit dans la demande de brevet Français n° 2.568.363 de la Société NOVATOME. L'échangeur comporte un faisceau de tubes qui est plongé, à la verticale, sur une partie de sa hauteur, dans le sodium liquide primaire rem­plissant la cuve du réacteur. Les tubes du faisceau ont chacun une extrémité d'entrée fixée à une première plaque tubulaire et une extrémité de sortie fixée à une seconde plaque tubulaire. Les deux plaques tubu­ laires sont disposées dans un même plan et présentent un même axe vertical qui correspond à l'axe vertical du faisceau. L'une des plaques situées à la partie centrale du faisceau est circulaire et l'autre plaque, située à la partie périphérique, est annulaire. Les tubes sont constitués, sur la plus grande partie de leur longueur, par des branches rectilignes et paral­lèles qui sont disposées à la verticale, lorsque le faisceau est en place dans la cuve du réacteur nuclé­aire. Le faisceau est à section sensiblement circu­laire et comporte un axe parallèle aux branches rec­tilignes des tubes passant par le centre des sections droites successives du faisceau dans lesquels les tu­bes sont répartis suivant un réseau régulier.Such an emergency exchanger has been described in French patent application No. 2,568,363 of the company NOVATOME. The exchanger comprises a bundle of tubes which is immersed, vertically, over part of its height, in the primary liquid sodium filling the reactor vessel. The bundle tubes each have an inlet end attached to a first tubular plate and an outlet end attached to a second tubular plate. The two tubu plates laires are arranged in the same plane and have the same vertical axis which corresponds to the vertical axis of the beam. One of the plates located at the central part of the beam is circular and the other plate, located at the peripheral part, is annular. The tubes consist, over most of their length, by rectilinear and parallel branches which are arranged vertically, when the bundle is in place in the nuclear reactor vessel. The bundle is of substantially circular section and has an axis parallel to the rectilinear branches of the tubes passing through the center of successive straight sections of the bundle in which the tubes are distributed in a regular network.

Pour assurer le maintien des tubes suivant ce réseau régulier dans les sections transversales du faisceau et pour absorber les forces transversales subies par les tubes dans le réacteur nucléaire en fonctionnement, on dispose des grilles entretoises de maintien transversal des tubes, ces grilles entretoi­ses étant réparties suivant la hauteur du faisceau.To maintain the tubes along this regular network in the cross sections of the bundle and to absorb the transverse forces undergone by the tubes in the nuclear reactor in operation, there are spacer grids for transversely holding the tubes, these spacer grids being distributed according to the height of the beam.

Ces grilles entretoises sont parallèles aux plaques tubulaires et reproduisent sensiblement le ré­seau constitué par les trous de passage des tubes dans les plaques tubulaires.These spacer grids are parallel to the tubular plates and substantially reproduce the network formed by the holes for the passage of the tubes in the tubular plates.

Dans la demande de brevet Français 2.568.363 on a proposé des grilles entretoises permettant de maintenir les tubes dans un réseau formé de rangées circulaires coaxiales disposées successivement les unes à la suite des autres, dans les directions axia­les des sections droites du faisceau.In French patent application 2,568,363, spacer grids have been proposed making it possible to maintain the tubes in a network formed by coaxial circular rows arranged successively one after the other, in the axial directions of the straight sections of the bundle.

De telles grilles entretoises sont consti­tuées par des cerces circulaires de hauteur constante et de rayon croissant vers l'extérieur disposées coa­ xialement de façon que deux cerces successives délimi­tent une rangée annulaire de largeur sensiblement constante.Such spacer grids are constituted by circular hoops of constant height and of radius increasing towards the outside arranged coa xially so that two successive hoops delimit an annular row of substantially constant width.

Des dispositifs élastiques en tôle métalli­que sont disposés dans chacune des rangées annulaires et sont fixés, d'une part à la cerce intérieure et d'autre part à la cerce extérieure délimitant la ran­gée.Elastic sheet metal devices are arranged in each of the annular rows and are fixed, on the one hand to the inner hoop and on the other hand to the outer hoop delimiting the row.

Ces dispositifs élastiques assurent donc l'assemblage des cerces constituant la grille entre­toise. De plus, les dispositifs élastiques comportent des logements pour recevoir les tubes et assurer leur maintien transversal.These elastic devices therefore ensure the assembly of the hoops constituting the spacer grid. In addition, the elastic devices include housings for receiving the tubes and ensuring their transverse maintenance.

Les dispositifs élastiques sont constitués par une bande métallique continue pliée de façon sinu­soïdale et mise sous la forme d'une couronne ayant une section crénelée ménageant des logements successifs pour les tubes. La mise en forme par pliage de la cou­ronne crénelée définit a priori la disposition relati­ve des tubes dans la rangée annulaire correspondante. Il en résulte donc un manque de souplesse quant à la disposition des tubes dans les rangées, au moment de la mise en place du faisceau. Bien que les tubes soient réalisés et mis en forme de façon à présenter une géométrie parfaitement définie, leur mise en place dans les sections transversales peut présenter quel­ques difficultés si leur disposition relative est dé­finie a priori. Il en est ainsi en particulier à cause de la très grande longueur des tubes du faisceau.The elastic devices consist of a continuous metal band folded in a sinusoidal fashion and put in the form of a crown having a crenellated section providing successive housings for the tubes. The shaping by folding of the crenellated crown a priori defines the relative arrangement of the tubes in the corresponding annular row. This therefore results in a lack of flexibility as to the arrangement of the tubes in the rows, when the beam is put in place. Although the tubes are produced and shaped so as to have a perfectly defined geometry, their positioning in the cross sections can present some difficulties if their relative arrangement is defined a priori. This is particularly so because of the very long length of the bundle tubes.

D'autre part, chaque grille entretoise com­porte une partie interne destinées à recevoir les branches des tubes reliées à la plaque tubulaire cir­culaire centrale et une partie externe destinée à re­cevoir les branches des tubes reliées à la plaque tu­ bulaire annulaire externe. Avant de commencer le mon­tage des tubes, on réalise l'assemblage de la partie interne des grilles entretoises, le montage de la partie externe étant effectué au moment du montage des tubes du faisceau qui viennent se placer successive­ment dans les rangées annulaires des grilles entretoi­ses. Ce montage de la partie externe des grilles en­tretoises à l'avancement nécessite de pouvoir adapter les dispositifs élastiques de maintien des tubes à la position exacte de ces tubes au moment du montage. La réalisation des dispositifs élastiques sous la forme d'une bande métallique ondulée et enroulée en couronne ne permet pas d'assurer facilement cette adaptation.On the other hand, each spacer grid has an internal part intended to receive the branches of the tubes connected to the central circular tubular plate and an external part intended to receive the branches of the tubes connected to the plate tu external annular bular. Before starting the assembly of the tubes, the internal part of the spacer grids is assembled, the assembly of the external part being carried out at the time of the assembly of the tubes of the bundle which are placed successively in the annular rows of the spacer grids. This mounting of the external part of the spacer grids during advancement requires being able to adapt the elastic devices for holding the tubes to the exact position of these tubes at the time of assembly. The realization of the elastic devices in the form of a corrugated metal band and wound in a crown does not allow this adaptation to be easily ensured.

En outre, les dispositifs élastiques réali­sés sous la forme de couronnes crénelées sont soumis à des efforts circonférentiels transmis par les tubes, si bien que chaque dispositif élastique doit être fixé sur la cerce intérieure et sur la cerce extérieure qui limitent la rangée correspondante par des soudures occupant la totalité ou la quasi totalité des surfaces de contact entre la couronne crénelée et les cerces.In addition, the elastic devices produced in the form of crenellated crowns are subjected to circumferential forces transmitted by the tubes, so that each elastic device must be fixed on the inner hoop and on the outer hoop which limit the corresponding row by welds. occupying all or almost all of the contact surfaces between the crenellated crown and the hoops.

Il est très difficile de mettre au point un procédé de soudage approprié permettant de réaliser l'assemblage des cerces et des dispositifs élastiques constitués par des couronnes crénelées, en particulier pour le montage à l'avancement de la partie externe des grilles entretoises.It is very difficult to develop an appropriate welding process making it possible to assemble the hoops and the elastic devices constituted by crenellated crowns, in particular for mounting on the advancement of the external part of the spacer grids.

Le but de l'invention est donc de proposer une grille entretoise de maintien transversal des tu­bes du faisceau d'un échangeur de chaleur qui sont disposés avec leurs axes parallèles et maintenus transversalement pour constituer un réseau régulier dans des plans perpendiculaires aux axes, par des grilles entretoises espacées suivant la direction axiale du faisceau et constituées chacune par un en­semble de cerces circulaires ayant un axe commun pa­rallèle aux tubes et par des dispositifs élastiques de maintien des tubes fixés chacun entre deux cerces suc­cessives intérieure et extérieure, respectivement, as­surant la liaison entre les cerces et le maintien des tubes dans une rangée annulaire entre les deux cerces successives, cette grille entretoise pouvant être adaptée à la position exacte des tubes du faisceau et pouvant être montée facilement, en particulier à l'a­vancement.The object of the invention is therefore to propose a spacer grid for transversely holding the tubes of the bundle of a heat exchanger which are arranged with their axes parallel and held transversely to form a regular network in planes perpendicular to the axes, by spacer grids spaced along the axial direction of the beam and each constituted by a set of circular hoops having a common axis parallel to the tubes and by elastic devices for holding the tubes each fixed between two successive inner and outer hoops, respectively, ensuring the connection between the hoops and the holding of the tubes in an annular row between the two successive hoops, this spacer grid being able to be adapted to the exact position of the tubes of the bundle and being able to be easily mounted, in particular during advancement.

Das ce but, les dispositifs élastiques de maintien des tubes sont constitués chacun par un en­semble de cavaliers en forme de U disposés successive­ment suivant une rangée annulaire et comportant chacun deux branches ménageant entre elles un logement pour un tube et une partie commune de liaison, les branches étant soudées à leurs extrémités libres à la cerce ex­térieure et la partie commune à la cerce intérieure.For this purpose, the elastic tube holding devices each consist of a set of U-shaped jumpers arranged successively in an annular row and each comprising two branches providing between them a housing for a tube and a common connecting part, the branches being welded at their free ends to the outer hoop and the common part to the inner hoop.

Afin de bien faire comprendre l'invention, on va maintenant décrire à titre d'exemple non limita­tif, en se référant aux figures jointes en annexe, un mode de réalisation d'une grille entretoise suivant l'invention.

  • La figure 1 est une vue de dessus d'une par­tie en forme de secteur angulaire, d'une grille entre­toise selon l'invention.
  • La figure 1a est une vue à plus grande échelle du détail A de la figure 1.
  • La figure 2 est une vue en perspective d'une partie de la grille entretoise.
In order to clearly understand the invention, we will now describe, by way of nonlimiting example, with reference to the attached figures, an embodiment of a spacer grid according to the invention.
  • Figure 1 is a top view of an angular sector-shaped part of a spacer grid according to the invention.
  • FIG. 1a is an enlarged view of detail A of FIG. 1.
  • Figure 2 is a perspective view of part of the spacer grid.

Sur la figure 1, on voit une partie d'une grille entretoise destinée à un échangeur de chaleur de secours d'un réacteur nucléaire à neutrons rapides, par exemple tel que décrit dans la demande de brevet Français 2.568.363.In Figure 1, we see a part of a spacer grid for a heat exchanger emergency of a fast neutron nuclear reactor, for example as described in French patent application 2,568,363.

Cette grille entretoise est constituée par des cerces circulaires de hauteur constante et de rayon croissant vers l'extérieur disposées de manière à avoir toutes pour axe l'axe du faisceau de l'échan­geur de chaleur, cet axe ayant pour trace le point 0 sur le plan de la figure 1.This spacer grid is constituted by circular hoops of constant height and of radius increasing towards the outside arranged so as to all have for axis the axis of the heat exchanger bundle, this axis having for trace the point 0 on the plan of figure 1.

Les cerces de la grille entretoise consti­tuent un premier ensemble interne formé des six cerces 1a, 1b, 1c, 1d, 1e, 1f et un second ensemble externe constitué par les quatre cerces 2a, 2b, 2c et 2d.The hoops of the spacer grid constitute a first internal assembly formed by the six hoops 1a, 1b, 1c, 1d, 1e, 1f and a second external assembly constituted by the four hoops 2a, 2b, 2c and 2d.

Les cerces du premier ensemble délimitent des rangées annulaires 5 destinées à recevoir les branches des tubes 4 reliées à la plaque tubulaire centrale du faisceau de forme circulaire.The hoops of the first set delimit annular rows 5 intended to receive the branches of the tubes 4 connected to the central tubular plate of the bundle of circular shape.

Les cerces du second ensemble délimitent des rangées annulaires 5ʹ destinées à recevoir les bran­ches des tubes 4 reliées à la plaque tubulaire externe de forme annulaire de l'échangeur de chaleur.The hoops of the second set delimit annular rows 5ʹ intended to receive the branches of the tubes 4 connected to the outer tubular plate of annular shape of the heat exchanger.

La cerce externe 1f du premier ensemble et la cerce interne 2a du second ensemble sont reliées entre elles par l'intermédiaire de paires de pièces 6, 6ʹ délimitant entre elles un espace de forme cylindri­que et soudées chacune d'une part à la cerce 1f et d'autre part à la cerce 2a. Un fourreau 7 est fixé sur chacune des paires de pièces 6, 6ʹ, dans l'espace cy­lindrique ménagé entre ces pièces. Des tirants verti­caux peuvent être fixés à l'intérieur des fourreaux 7, pour assurer la suspension de la grille entretoise à la partie supérieure de l'échangeur de chaleur, comme il est décrit dans la demande de brevet 2.568.363. Chacun des tirants est engagé dans les fourreaux des différentes grilles entretoises placées suivant la hauteur du faisceau.The outer hoop 1f of the first assembly and the inner hoop 2a of the second assembly are connected together by means of pairs of parts 6, 6ʹ delimiting between them a space of cylindrical shape and each welded on the one hand to the hoop 1f and on the other hand to the hoop 2a. A sheath 7 is fixed to each of the pairs of parts 6, 6ʹ, in the cylindrical space formed between these parts. Vertical tie rods can be fixed inside the sleeves 7, to ensure the suspension of the spacer grid at the top of the heat exchanger, as described in patent application 2,568,363. Each of the tie rods is engaged in the sleeves of the different spacer grids placed according to the height of the beam.

En se reportant à l'ensemble des figures, on voit que les cerces successives délimitant des rangées successives de forme annulaire 5 et 5ʹ sont reliées entre elles par des cavaliers 8 en forme de U disposés successivement les uns à la suite des autres dans la direction périphérique de la grille entretoise, c'est-­à-dire suivant les rangées annulaires 5 et 5ʹ. Chacun des cavaliers 8 ayant la forme générale d'un U compor­te deux branches 8a et 8b et une partie commune 8c de liaison entre les branches 8a et 8b. Chacune des bran­ches 8a et 8b est pliée vers l'extérieur de façon à constituer un logement 10 de forme évasée pour un tube 4 du faisceau.Referring to all of the figures, it can be seen that the successive hoops delimiting successive rows of annular shape 5 and 5ʹ are interconnected by U-shaped jumpers 8 arranged successively one after the other in the direction device of the spacer grid, that is to say along the annular rows 5 and 5ʹ. Each of the jumpers 8 having the general shape of a U has two branches 8a and 8b and a common part 8c for connection between the branches 8a and 8b. Each of the branches 8a and 8b is folded outwards so as to constitute a housing 10 of flared shape for a tube 4 of the bundle.

L'espace intérieur du cavalier comporte ainsi une partie de faible largeur voisine de la par­tie commune de liaison 8c et une partie voisine de l'ouverture du U de plus forte largeur, cette partie étant reliée à la partie de faible largeur par deux parties inclinées des branches 8a et 8b réalisées par pliage. La largeur de l'ouverture du cavalier est su­périeure au diamètre extérieur des tubes 4 du faisceau alors que la partie intérieure à plus faible largeur du cavalier a une dimension inférieure au diamètre du tube 4. Les parties intermédiaires inclinées des bran­ches 8a et 8b assurent l'appui et le centrage du tube 4. Les branches 8a et 8b du cavalier 8 comportent à leur extrémité correspondant à l'ouverture du cava­lier, des pattes de soudage 9a et 9b pliées à 90° vers l'extérieur.The interior space of the rider thus comprises a part of small width close to the common connecting part 8c and a part close to the opening of the U of greater width, this part being connected to the part of small width by two inclined parts. branches 8a and 8b produced by folding. The width of the jumper opening is greater than the outside diameter of the tubes 4 of the bundle, while the smaller width inside part of the jumper has a dimension less than the diameter of the tube 4. The inclined intermediate parts of the branches 8a and 8b ensure the 'support and centering of the tube 4. The branches 8a and 8b of the jumper 8 have at their end corresponding to the opening of the jumper, welding tabs 9a and 9b folded 90 ° outwards.

Comme il est visible sur la figure 2, les cavaliers 8 sont soudés sur les cerces 1 ou 2 corres­pondantes, d'une part par l'intermédiaire de leur par­ tie commune 8c et d'autre part par l'intermédiaire des pattes 9a et 9b. Les soudures sont réalisées sur chant, au niveau du bord inférieur et du bord supé­rieur des cerces correspondantes. Les zones de soudure ne s'étendent que sur une faible hauteur de la cerce, la partie restante de la zone de contact entre le ca­valier et les cerces ne comportant pas de liaison par soudure.As can be seen in FIG. 2, the jumpers 8 are welded to the corresponding ribs 1 or 2, on the one hand by means of their by common tie 8c and on the other hand via the legs 9a and 9b. The welds are made on edge, at the lower edge and the upper edge of the corresponding hoops. The weld zones extend only over a small height of the hoop, the remaining part of the contact zone between the rider and the hoops having no weld connection.

L'inclinaison des pattes de soudage 9a et 9b des cerces 8 est adaptée au rayon de courbure de la cerce sur laquelle sont fixées ces pattes.The inclination of the welding lugs 9a and 9b of the hoops 8 is adapted to the radius of curvature of the hoop on which these lugs are fixed.

Les cavaliers sont fixés par l'extrémité de leurs branches sur la surface intérieure de la cerce extérieure limitant la rangée où ils sont disposés et par leur partie commune sur la surface extérieure de la cerce intérieure limitant la rangée.The jumpers are fixed by the end of their branches on the inner surface of the outer hoop limiting the row where they are arranged and by their common part on the outer surface of the inner hoop limiting the row.

On a réalisé les grilles entretoises pour un échangeur de chaleur de secours d'un réacteur nucléai­re à neutrons rapides refroidi par du sodium liquide.The spacer grids were made for an emergency heat exchanger of a fast neutron nuclear reactor cooled by liquid sodium.

Les grilles entretoises sont constituées par des cerces en acier inoxydable dont la hauteur est de 35 mm et l'épaisseur de 1 mm.The spacer grids are formed by stainless steel hoops whose height is 35 mm and the thickness of 1 mm.

Ces dimensions se comparent favorablement aux dimensions des plaques entretoises selon l'art an­térieur constitué par des cerces reliées par une bande métallique ondulée enroulée sous la forme d'une cou­ronne crénelée. Dans ce cas, la hauteur des cerces était de 50 mm et leur épaisseur de 1,5 mm.These dimensions compare favorably with the dimensions of the spacer plates according to the prior art constituted by hoops connected by a corrugated metal strip wound in the form of a crenellated crown. In this case, the height of the hoops was 50 mm and their thickness 1.5 mm.

Le montage des grilles entretoises et des tubes du faisceau peut être réalisé selon le procédé décrit dans la demande de brevet 2.568.363. Les cerces 1a, 1b, 1c, 1d, 1e, 1f constituant la partie intérieu­re de la grille entretoise sont tout d'abord assem­blées en utilisant des cavaliers 8 disposés dans les rangées, les uns à la suite des autres avec un espace­ment sensiblement constant. Cet espacement peut cepen­dant être réglé en fonction de la position exacte des branches des tubes reliées à la partie centrale de la plaque tubulaire. Les cavaliers 8 sont fixés sur les cerces 1, à l'intérieur des rangées annulaires 5, par des soudures TIG sur chant, au niveau du bord supé­rieur et au niveau du bord inférieur des cerces cor­respondantes, c'est-à-dire par le dessus et par le dessous de ces cerces (soudage à plat et au plafond). Cette opération de soudage sur chant peut être réali­sée rapidement et sans difficultés particulières.The mounting of the spacer grids and of the bundle tubes can be carried out according to the method described in patent application 2,568,363. The hoops 1a, 1b, 1c, 1d, 1e, 1f constituting the inner part of the spacer grid are first assembled using jumpers 8 arranged in the rows, one after the other with a substantially constant spacing. This spacing can however be adjusted as a function of the exact position of the branches of the tubes connected to the central part of the tube plate. The jumpers 8 are fixed to the hoops 1, inside the annular rows 5, by TIG welds on edge, at the upper edge and at the lower edge of the corresponding hoops, that is to say by the above and below these hoops (flat and ceiling welding). This edge welding operation can be carried out quickly and without particular difficulties.

Les cerces extérieures 2 constituant les rangées annulaires 5ʹ sont mises ensuite en place, au moment du montage des tubes du faisceau.The outer rings 2 constituting the annular rows 5ʹ are then put in place, at the time of assembly of the bundle tubes.

Les tubes 4 dont l'une des branches vient se placer dans une rangée 5ʹ de la partie extérieure de la grille entretoise sont mis en place dans la partie interne des grilles et dans la partie centrale de la plaque tubulaire. La partie externe de la grille en­tretoise est ensuite réalisée à l'avancement. Les cerces 2a, 2b et 2c sont constituées à l'avance par soudage des cavaliers 8 sur leur parties communes 8c. Les cerces ainsi constituées sont placées avant enfi­lage de la rangée de tubes correspondante. Lorsque la rangée est remplie, la cerce suivante est posée par soudage des parties 9a et 9b des cavaliers de la cerce précédente. Les écarts de position des tubes sont re­pris avant soudage par pincement des cavaliers, pour assurer leur positionnement correct. Les cavaliers 8 sont mis en place de façon très précise et sans dif­ficulté.The tubes 4, one of the branches of which is placed in a row 5ʹ of the external part of the spacer grid are placed in the internal part of the grids and in the central part of the tube plate. The external part of the spacer grid is then produced during advancement. The hoops 2a, 2b and 2c are formed in advance by welding the jumpers 8 on their common parts 8c. The hoops thus formed are placed before threading the corresponding row of tubes. When the row is filled, the next hoop is placed by welding parts 9a and 9b of the jumpers of the previous hoop. The position differences of the tubes are taken up before welding by pinching the jumpers, to ensure their correct positioning. The jumpers 8 are set up very precisely and without difficulty.

La réalisation des dispositifs de maintien élastiques des tubes sous forme de cavaliers indépen­ dants a d'autre part l'avantage de réduire les efforts tangentiels exercés par le faisceau sur ces éléments élastiques, ces efforts étant transmis directement par les branches des cavaliers aux cerces correspondantes.The production of elastic tube holding devices in the form of independent jumpers dants on the other hand has the advantage of reducing the tangential forces exerted by the beam on these elastic elements, these forces being transmitted directly by the branches of the riders to the corresponding hoops.

Le montage de la grille entretoise peut donc être effectué rapidement et sans difficultés, la gril­le entretoise étant d'autre part parfaitement adaptée à la configuration du faisceau.The mounting of the spacer grid can therefore be carried out quickly and without difficulty, the spacer grid being also perfectly suited to the configuration of the beam.

L'invention ne se limite pas au mode de réa­lisation qui a été décrit.The invention is not limited to the embodiment which has been described.

C'est ainsi qu'on peut imaginer d'utiliser des cavaliers d'une forme différente de celle qui a été décrite, à partir du moment où ces cavaliers com­portent deux branches qui peuvent être reliées à la cerce extérieure et une partie commune qui peut être reliée à la cerce intérieure ainsi qu'un espace inter­ne réservant un logement pour un tube 4 dont le cava­lier 8 assure un maintien transversal empêchant tout déplacement ou toute vibration en service.This is how we can imagine using jumpers of a shape different from that which has been described, from the moment when these jumpers have two branches which can be connected to the outer hoop and a common part which can be connected to the inner hoop as well as an internal space reserving a housing for a tube 4 whose jumper 8 provides transverse support preventing any movement or any vibration in service.

Les cerces et les cavaliers peuvent être ré­alisés en tout matériau métallique compatible avec les conditions d'utilisation et les fluides utilisés dans l'échangeur de chaleur.The hoops and the jumpers can be made of any metallic material compatible with the conditions of use and the fluids used in the heat exchanger.

On peut imaginer un assemblage des cerces et des cavaliers par d'autres procédés de soudage que le procédé TIG sur chant.One can imagine an assembly of the hoops and the jumpers by other welding processes than the TIG process on edge.

Enfin, une grille entretoise suivant l'in­vention peut être utilisée dans tout échangeur de cha­leur comportant un faisceau à tubes parallèles dispo­sés suivant des rangées annulaires coaxiales.Finally, a spacer grid according to the invention can be used in any heat exchanger comprising a bundle of parallel tubes arranged in coaxial annular rows.

Claims (7)

1.- Grille entretoise de maintien transver­sal des tubes (4) du faisceau d'un échangeur de cha­leur qui sont disposés avec leurs axes parallèles et maintenus transversalement, pour constituer un réseau régulier dans des plans perpendiculaires aux axes, par des grilles entretoises espacées suivant la direction axiale du faisceau et constituées chacune par un en­semble de cerces circulaires (1, 2) ayant un axe com­mun O parallèle aux tubes (4) et par des dispositifs élastiques (8) de maintien des tubes fixés chacun entre deux cerces successives intérieure et extérieu­re, respectivement, assurant la liaison entre les cerces (1, 2) et le maintien des tubes (4) dans une rangée annulaire (5, 5ʹ) entre les deux cerces succes­sives (1, 2), caractérisée par le fait que les dispo­sitifs élastiques de maintien des tubes (8) sont cons­titués chacun par un ensemble de cavaliers en forme de U disposés successivement suivant une rangée annulaire (5, 5ʹ) et comportant chacun deux branches (8a, 8b) ménageant entre elles un logement (10) pour un tube (4) et une partie commune (8c) de liaison, les bran­ches (8a, 8b) étant soudées à leurs extrémités libres (9a, 9b) à la cerce extérieure et la partie commune (8c) à la cerce intérieure.1.- Spacer grid for transversely holding the tubes (4) of the bundle of a heat exchanger which are arranged with their parallel axes and held transversely, to form a regular network in planes perpendicular to the axes, by spacer grids spaced along the axial direction of the beam and each constituted by a set of circular hoops (1, 2) having a common axis O parallel to the tubes (4) and by elastic devices (8) for holding the tubes each fixed between two successive inner hoops and outer, respectively, ensuring the connection between the hoops (1, 2) and the maintenance of the tubes (4) in an annular row (5, 5ʹ) between the two successive hoops (1, 2), characterized in that the devices elastic retaining tubes (8) each consist of a set of U-shaped jumpers arranged successively in an annular row (5, 5ʹ) and each comprising two branches (8a, 8b) men acting between them a housing (10) for a tube (4) and a common connecting part (8c), the branches (8a, 8b) being welded at their free ends (9a, 9b) to the outer hoop and the common part (8c) at the inner circle. 2.- Grille entretoise suivant la revendica­tion 1, caractérisée par le fait que les cavaliers (8) sont soudés aux cerces (1, 2) correspondantes par sou­dage TIG sur chant, au niveau du bord supérieur et au niveau du bord inférieur de la cerce (1, 2).2.- spacer grid according to claim 1, characterized in that the jumpers (8) are welded to the corresponding hoops (1, 2) by TIG welding on edge, at the upper edge and at the lower edge of the hoop (1, 2). 3.- Grille entretoise suivant la revendica­tion 2, caractérisée par le fait que les zones de sou­dage (11, 12) des cavaliers (8) sur les cerces (1, 2) s'étendent sur une faible hauteur à partir des bords des cerces (1, 2).3.- spacer grid according to claim 2, characterized in that the welding zones (11, 12) of the jumpers (8) on the hoops (1, 2) extend over a small height from the edges of the hoops (1, 2). 4.- Grille entretoise suivant l'une quelcon­que des revendications 1 à 3, caractérisée par le fait que les branches (8a, 8b) des cavaliers (8) sont pliés vers l'extérieur sur une partie de leur longueur, de façon que l'espace intérieur du cavalier (8) comporte une partie voisine de l'ouverture entre ses branches (8a, 8b) ayant une largeur supérieure au diamètre des tubes (4) et une partie voisine de sa partie fermée (8c) d'une largeur inférieure au diamètre des tubes (4), le logement (10) des tubes comportant la partie de grande largeur des cavaliers et étant délimité par les parties pliées vers l'extérieur des branches (8a, 8b) constituant des surfaces d'appui des tubes (4).4.- spacer grid according to any one of claims 1 to 3, characterized in that the branches (8a, 8b) of the jumpers (8) are folded outwards over part of their length, so that the interior space of the rider (8) comprises a part close to the opening between its branches (8a, 8b) having a width greater than the diameter of the tubes (4) and a part close to its closed part (8c) having a width smaller than the diameter of the tubes (4), the housing (10) of the tubes comprising the very wide portion of the jumpers and being delimited by the outwardly bent portions of the branches (8a, 8b) constituting the bearing surfaces of the tubes (4). 5.- Grille entretoise suivant l'une quel­conque des revendications 1 à 4, caractérisée par le fait que les branches (8a, 8b) des cavaliers (8) com­portent des pattes de soudage (9a, 9b)à leur extrémi­té, repliées vers l'extérieur.5.- spacer grid according to any one of claims 1 to 4, characterized in that the branches (8a, 8b) of the jumpers (8) have welding tabs (9a, 9b) at their end, folded towards the 'outside. 6.- Procédé de montage d'une grille entre­toise suivant l'une quelconque des revendications 1 à 5, comportant un ensemble de cerces (1a, 1b, 1c, 1d, 1e, 1f) constituant la partie intérieure de la grille entretoise destinée à recevoir, dans les rangées annu­laires (5) correspondantes entre les cerces, une pre­mière branche de chacun des tubes (4) du faisceau et un second ensemble de cerces (2a, 2b, 2c, 2d) consti­tuant la partie extérieure de la grille entretoise destinée à recevoir dans les rangées annulaires (5ʹ) correspondantes entre les cerces, une seconde branche de chacun des tubes du faisceau, caractérisé par le fait :
- qu'on réalise le pré-assemblage de la partie inté­rieure de la grille entretoise, en mettant en place les cerces (1a, 1b, 1c, 1d, 1e, 1f) et en assurant leur assemblage par des cavaliers (8) correspondants, disposés les uns à la suite des autres avec un écar­tement sensiblement constant dans les rangées (5) entre les cerces,
- qu'on met en place dans la partie interne pré-as­semblée de la grille entretoise les premières branches des tubes du faisceau dont les secondes branches vien­nent en position dans les rangées annulaires (5ʹ) de la partie externe de la grille,
- qu'on met en place les cerces destinées à constituer les rangées (5ʹ) de la partie externe de la grille sur lesquelles sont fixés les cavaliers (8) par l'inter­médiaire de leur partie commune de liaison (8c),
- qu'on introduit les secondes branches des tubes (4) entre les branches (8a, 8b) des cavaliers correspon­dants,
- et qu'on réalise après mise en place d'une rangée complète de tubes (4), l'assemblage des cavaliers (8) et de la cerce suivante par soudage TIG sur chant des pattes de soudage (9a, 9b) sur la cerce suivante.6.- A method of mounting a spacer grid according to any one of claims 1 to 5, comprising a set of hoops (1a, 1b, 1c, 1d, 1e, 1f) constituting the inner part of the spacer grid receive, in the corresponding annular rows (5) between the hoops, a first branch of each of the tubes (4) of the bundle and a second set of hoops (2a, 2b, 2c, 2d) constituting the external part of the spacer grid intended to receive in the corresponding annular rows (5ʹ) between the hoops, a second branch of each of the bundle tubes, characterized by the fact:
- that the inner part of the spacer grid is pre-assembled, by installing the hoops (1a, 1b, 1c, 1d, 1e, 1f) and ensuring their assembly by corresponding jumpers (8), arranged one after the other with a substantially constant spacing in the rows (5) between the hoops,
- the first branches of the bundle tubes are placed in the pre-assembled internal part of the spacer grid, the second branches of which come into position in the annular rows (5ʹ) of the external part of the grid,
- one sets up the hoops intended to constitute the rows (5ʹ) of the external part of the grid on which the jumpers are fixed (8) by means of their common connecting part (8c),
- introducing the second branches of the tubes (4) between the branches (8a, 8b) of the corresponding jumpers,
- And that is carried out after installation of a complete row of tubes (4), the assembly of the jumpers (8) and the following hoop by TIG welding on edge of the welding lugs (9a, 9b) on the next hoop. 7.- Utilisation d'une grille entretoise sui­vant l'une quelconque des revendications 1 à 5 pour le maintien transversal des tubes (4) du faisceau d'un échangeur de chaleur de secours d'un réacteur nucléai­re à neutrons rapides refroidi par du sodium liquide.7.- Use of a spacer grid according to any one of claims 1 to 5 for the transverse maintenance of the tubes (4) of the bundle of a backup heat exchanger of a fast neutron nuclear reactor cooled by sodium liquid.
EP19880400777 1987-04-17 1988-03-30 Strut grid for cross-supporting the tubes of a heat exchanger tube bundle and assembling process of such a strut grid Expired - Lifetime EP0287422B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8705542 1987-04-17
FR8705542A FR2614094B1 (en) 1987-04-17 1987-04-17 SPACER GRID FOR CROSS-HOLDING THE TUBES OF THE BEAM OF A HEAT EXCHANGER AND METHOD OF ASSEMBLY AND USE OF SUCH A SPACER GRID

Publications (2)

Publication Number Publication Date
EP0287422A1 true EP0287422A1 (en) 1988-10-19
EP0287422B1 EP0287422B1 (en) 1991-01-23

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EP19880400777 Expired - Lifetime EP0287422B1 (en) 1987-04-17 1988-03-30 Strut grid for cross-supporting the tubes of a heat exchanger tube bundle and assembling process of such a strut grid

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Country Link
EP (1) EP0287422B1 (en)
JP (1) JPS6446589A (en)
DE (1) DE3861615D1 (en)
FR (1) FR2614094B1 (en)

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Publication number Priority date Publication date Assignee Title
CN111486740A (en) * 2020-04-23 2020-08-04 中国原子能科学研究院 Heat exchanger and method of assembling the same

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CN102561365A (en) * 2011-12-01 2012-07-11 成都理工大学 Sliding sand slope reinforcing device

Citations (4)

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Publication number Priority date Publication date Assignee Title
FR2420735A2 (en) * 1978-03-24 1979-10-19 Trepaud Georges TUBULAR BEAM HEAT EXCHANGER
GB1564821A (en) * 1977-02-04 1980-04-16 Atomic Energy Authority Uk Tube in shell heat exchangers
US4286654A (en) * 1979-03-19 1981-09-01 Foster Wheeler Limited Heat exchanger tube supports
FR2568363A1 (en) * 1984-07-26 1986-01-31 Novatome EMERGENCY HEAT EXCHANGER FOR COOLING THE PRIMARY FLUID OF A NUCLEAR REACTOR AND METHOD OF MOUNTING THE HEAT EXCHANGER

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JPS5811392A (en) * 1981-07-10 1983-01-22 Hitachi Ltd Supporting structure of heat transmitting pipe for heat exchanger of heat

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Publication number Priority date Publication date Assignee Title
GB1564821A (en) * 1977-02-04 1980-04-16 Atomic Energy Authority Uk Tube in shell heat exchangers
FR2420735A2 (en) * 1978-03-24 1979-10-19 Trepaud Georges TUBULAR BEAM HEAT EXCHANGER
US4286654A (en) * 1979-03-19 1981-09-01 Foster Wheeler Limited Heat exchanger tube supports
FR2568363A1 (en) * 1984-07-26 1986-01-31 Novatome EMERGENCY HEAT EXCHANGER FOR COOLING THE PRIMARY FLUID OF A NUCLEAR REACTOR AND METHOD OF MOUNTING THE HEAT EXCHANGER

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111486740A (en) * 2020-04-23 2020-08-04 中国原子能科学研究院 Heat exchanger and method of assembling the same
CN111486740B (en) * 2020-04-23 2021-09-28 中国原子能科学研究院 Heat exchanger and method of assembling the same

Also Published As

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JPS6446589A (en) 1989-02-21
FR2614094A1 (en) 1988-10-21
DE3861615D1 (en) 1991-02-28
EP0287422B1 (en) 1991-01-23
FR2614094B1 (en) 1989-09-15

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