EP0740767A1 - Heat exchanger for a contaminated fluid - Google Patents

Heat exchanger for a contaminated fluid

Info

Publication number
EP0740767A1
EP0740767A1 EP95902175A EP95902175A EP0740767A1 EP 0740767 A1 EP0740767 A1 EP 0740767A1 EP 95902175 A EP95902175 A EP 95902175A EP 95902175 A EP95902175 A EP 95902175A EP 0740767 A1 EP0740767 A1 EP 0740767A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
connector
bellows
grille
fluid
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
EP95902175A
Other languages
German (de)
French (fr)
Other versions
EP0740767B1 (en
Inventor
François Noel REMY
Patrick Grandclement
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electricite de France SA
Original Assignee
Electricite de France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electricite de France SA filed Critical Electricite de France SA
Publication of EP0740767A1 publication Critical patent/EP0740767A1/en
Application granted granted Critical
Publication of EP0740767B1 publication Critical patent/EP0740767B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02Header boxes; End plates
    • F28F9/0236Header boxes; End plates floating elements
    • F28F9/0239Header boxes; End plates floating elements floating header boxes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1607Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with particular pattern of flow of the heat exchange media, e.g. change of flow direction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0054Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for nuclear applications

Definitions

  • the present invention relates to heat exchange devices and in particular those intended to cool a hot fluid which has been contaminated by radioactive substances and which leaves the enclosure of a nuclear reactor.
  • hot and contaminated fluid cooling devices which use an intermediate heat exchanger.
  • This type of device consists of a first heat exchanger, generally called an intermediate heat exchanger, which performs a first heat exchange, between the hot and contaminated fluid leaving the reactor and a first cooling fluid, and a second heat exchanger. heat which performs a second heat exchange between the first cooling fluid and a second cooling fluid, the latter being discharged to the outside.
  • the coolant and the hot fluid which pass through a heat exchanger have different temperatures, it is often subjected to temperature gradients and transient thermal phenomena of large amplitudes during periods of normal use of the nuclear reactor and even greater when an accident occurs.
  • One of the main goals of nuclear power plant designers is to make the intermediate heat exchanger as mechanically resistant as possible to the stresses imposed on it, due to differences between the deformations of the cooling fluid circulation tubes and those of the shell of the exchanger, traversed by the hot fluid.
  • the present invention relates to a heat exchange device which has mechanical resistance characteristics to deformations due to the temperature gradient which are as good as those of the exchangers of the prior art and which, while comprising only one exchanger heat, has significantly improved sealing characteristics, so that this heat exchange device, with a single heat exchanger, can be placed in the backup circuits of a nuclear reactor to ensure the cooling of the hot fluid contaminated leaving the reactor enclosure by a cooling fluid, directly from the external environment, including in old nuclear power plants lacking space to house a device with two exchangers.
  • the heat exchanger designed according to the invention comprises:
  • - a cylindrical shell which defines a container having an inlet (outlet) connection for the coolant at one of its ends, a pair of tubular plates mounted in the container.
  • One is rigidly attached to the grille.
  • the other is welded and crimped to the grille over its entire periphery and defines, with a closing cover, a floating head in which is formed a connector for the outlet (entry) of the coolant, - a bundle of substantially parallel tubes.
  • Some of the ends are fixed firmly to the tube plate which is rigidly fixed to the grille. Their other ends are crimped and welded over the entire thickness of the tube plate which is welded and crimped over its entire periphery to the grille.
  • the outlet connection (inlet) of the coolant formed in the floating head consists at least in part of a bellows.
  • the hot bellows-fluid contact which existed according to the patents of the prior art and which constituted a weak point of sealing against radioactive substances is, in the heat exchanger, according to the invention, eliminated.
  • the bellows is closer along the axis of the grille of the welded tubular plate and crimped to the grille than from the top of the floating head.
  • the deformations due to the temperature gradient being the greatest at the level of the contact of the tube plate and the grille, the fact that the bellows is at immediate vicinity of the tube plate ensures that the bellows will collect the most significant deformations as quickly as possible.
  • the heat exchanger is more leaktight and more mechanically resistant than those of the prior art, and in particular, than those according to patents GB-A-12867222 and US- A-3850231.
  • the connector associated with the bellows is on the same side of the grille as the inlet connector for the hot fluid, in particular, on the same generator of the grille. It follows that the bellows is as close as possible to the point of the hot fluid-tubular plate contact zone where the temperature gradient is maximum. By placing the bellows as close as possible to this point on the plate, we ensure an even greater effectiveness of the bellows in absorbing deformation.
  • the sealing and mechanical strength characteristics of the heat exchanger according to the invention allow it to be used in a backup circuit of an enclosure of a nuclear reactor which, in the event of an accident, cools the hot contaminated fluid leaving the enclosure with a cooling fluid that can be poured directly outside.
  • the heat exchanger shown comprises a shell 1 comprising a bundle of tubes 2 that are substantially straight for the passage of the cooling fluid.
  • This bundle of tubes 2 which is only partially shown, is mounted between tubular plates 3.
  • the tubes 2 are welded and crimped over the entire thickness of the tubular plates 3.
  • the calender 1 is terminated by a head 4 in which is provided a connection 9 inlet (outlet) of the coolant.
  • a head 5 is mounted floating on the grille 1.
  • a connection 8 for the outlet (inlet) of the cooling fluid is provided on the floating mounted head 5.
  • the connector 8 partly consists of a bellows 10.
  • the connector 8, along the axis ZZ ', is closer to the tube plate 3 than to the top of the floating head 5.
  • the angle formed in a plane normal to the axis ZZ 'between the projection of the axis XX' on the plane and the projection of the axis YY 'on this same plane,. Is zero .
  • the bellows is thus as close as possible to the zone where the temperature gradient is maximum, which allows it to quickly absorb the deformations.

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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)

Abstract

A heat exchanger, in particular for a contaminated fluid in the nuclear industry. The tubes (2) forming the tube core are welded and crimped across the whole width of the tubular plate (3) which defines the floating head (5) together with the sealing cover, and said tubular plate is also welded and crimped to the calandria (1) along the whole of its periphery.

Description

Echangeur de chaleur pour fluide contaminé.Heat exchanger for contaminated fluid.
La présente invention concerne les dispositifs d'échange de chaleur et notamment ceux destinés à refroidir un fluide chaud qui a été contaminé par des substances radioactives et qui sort de l'enceinte d'un réacteur nucléaire.The present invention relates to heat exchange devices and in particular those intended to cool a hot fluid which has been contaminated by radioactive substances and which leaves the enclosure of a nuclear reactor.
Dans les centrales nucléaires, on connaît des dispositifs de refroidissement de fluide chaud et contaminé qui utilisent un échangeur de chaleur intermédiaire. Ce type de dispositifs est constitué d'un premier échangeur de chaleur, appelé généralement échangeur de chaleur intermédiaire, qui réalise un premier échange de chaleur, entre le fluide chaud et contaminé sortant du réacteur et un premier fluide de refroidissement, et un second échangeur de chaleur qui réalise un second échange de chaleur entre le premier fluide de refroidissement et un second fluide de refroidissement, ce dernier étant déversé à l'extérieur.In nuclear power plants, hot and contaminated fluid cooling devices are known which use an intermediate heat exchanger. This type of device consists of a first heat exchanger, generally called an intermediate heat exchanger, which performs a first heat exchange, between the hot and contaminated fluid leaving the reactor and a first cooling fluid, and a second heat exchanger. heat which performs a second heat exchange between the first cooling fluid and a second cooling fluid, the latter being discharged to the outside.
En utilisant ces dispositifs à échangeur de chaleur intermédiaire, on s'assure une double protection de l'environnement extérieur contre les fuites radioactives. En effet, pour qu'une contamination ait lieu, il faut que les substances radioactives passent au travers de deux parois de séparation d'échange de chaleur (une par échangeur) .By using these devices with an intermediate heat exchanger, double protection of the external environment is ensured against radioactive leaks. In fact, for contamination to take place, the radioactive substances must pass through two heat exchange partition walls (one per exchanger).
Comme le fluide de refroidissement et le fluide chaud qui passent dans un échangeur de chaleur ont des températures différentes, celui-ci est souvent soumis à des gradients de température et à des phénomènes thermiques transitoires de grandes amplitudes pendant les périodes d'utilisation normale du réacteur nucléaire et encore plus grandes lorsque survient un accident. L'un des buts principaux des concepteurs de centrales nucléaires est de rendre l'échangeur de chaleur intermédiaire aussi résistant mécaniquement que possible aux contraintes qui lui sont imposées, en raison de différences entre les déformations des tubes de circulation du fluide de refroidissement et celles de la calandre de l'échangeur, parcouru par le fluide chaud.Since the coolant and the hot fluid which pass through a heat exchanger have different temperatures, it is often subjected to temperature gradients and transient thermal phenomena of large amplitudes during periods of normal use of the nuclear reactor and even greater when an accident occurs. One of the main goals of nuclear power plant designers is to make the intermediate heat exchanger as mechanically resistant as possible to the stresses imposed on it, due to differences between the deformations of the cooling fluid circulation tubes and those of the shell of the exchanger, traversed by the hot fluid.
A cet effet, on a prévu un soufflet et une paroi déformable (brevet français N°712 359 et brevet anglais N°1286722) dans l'échangeur de chaleur intermédiaire, qui ont pour fonction d'encaisser les déformations mentionnées ci-dessus. De même le brevet US-A N°3850231 propose un dispositif ayant un échangeur de chaleur intermédiaire dans lequel sont prévus deux soufflets que le fluide chaud doit traverser avant de pouvoir contaminer le fluide de refroidissement et un moyen, logé dans l'espace clos défini par les deux soufflets, la calandre et la tête flottante, pour détecter la fuite du fluide chaud à travers le premier soufflet.For this purpose, there is provided a bellows and a deformable wall (French patent No. 712 359 and English patent No. 1286722) in the intermediate heat exchanger, which have the function of absorbing the deformations mentioned above. Likewise, US Pat. No. 3,850,231 proposes a device having an intermediate heat exchanger in which two bellows are provided which the hot fluid must pass through before being able to contaminate the cooling fluid and a means, housed in the defined closed space. by the two bellows, the grille and the floating head, to detect the leakage of the hot fluid through the first bellows.
Le brevet anglais GB-A-12867222 et le brevet US- A-3850231 permettent effectivement d'améliorer la résistance aux déformations mécaniques dues à la dilatation en introduisant un soufflet qui encaisse ces déformations. Cependant, dans les échangeurs de chaleur selon ces deux brevets, l'étanchéité au fluide chaud contaminé est diminuée du fait que le fluide chaud contaminé est en contact direct avec le soufflet au travers duquel il peut fuir plus facilement.The British patent GB-A-12867222 and the US-A-3850231 patent effectively improve the resistance to mechanical deformations due to expansion by introducing a bellows which collects these deformations. However, in the heat exchangers according to these two patents, the tightness to the contaminated hot fluid is reduced because the contaminated hot fluid is in direct contact with the bellows through which it can leak more easily.
Certes, selon le brevet US-A-3850231, le fluide chaud doit maintenant traverser deux soufflets, au lieu d'un selon le brevet anglais, avant de contaminer le fluide de refroidissement, mais cela n'empêche qu'en partie la possibilité de contamination du fluide froid. En effet, si le fluide chaud peut fuir à travers le premier soufflet, il en fera de même à travers le second dans un délai plus ou moins bref. Dans le cas d'un fonctionnement normal du réacteur, il faudra, dès détection de la première fuite, arrêter les opérations, entraînant des surcoûts importants, et dans le cas d'un accident de fonctionnement d'un réacteur, la contamination aura lieu dès que le fluide chaud aura traversé le second soufflet.Admittedly, according to patent US-A-3850231, the hot fluid must now pass through two bellows, instead of one according to the English patent, before contaminating the cooling fluid, but this only partially prevents the possibility of contamination of cold fluid. Indeed, if the hot fluid can leak through the first bellows, it will do the same through the second in a more or less short time. In the case of normal reactor operation, upon detection of the first leak, operations will have to be stopped, resulting in significant additional costs, and in the event of a reactor operating accident, contamination will take place as soon as that the hot fluid will have passed through the second bellows.
La faible étanchéité de ces échangeurs de chaleur intermédiaire de l'art antérieur ne permet pas de concevoir un dispositif d'échange de chaleur réacteur-extérieur qui ne soit formé que d'un seul échangeur de chaleur.The poor tightness of these intermediate heat exchangers of the prior art does not make it possible to design a reactor-exterior heat exchange device which is formed only from a single heat exchanger.
La présente invention vise un dispositif d'échange de chaleur qui a des caractéristiques de résistance mécanique aux déformations dues au gradient de température qui sont aussi bonnes que celles des échangeurs de l'art antérieur et qui, tout en ne comportant qu'un seul échangeur de chaleur, a des caractéristiques d'étanchéité nettement améliorées, de sorte que ce dispositif d'échange de chaleur, à un seul échangeur de chaleur, peut être placé dans des circuits de secours d'un réacteur nucléaire pour assurer le refroidissement du fluide chaud contaminé sortant de l'enceinte du réacteur par un fluide de refroidissement, directement issu de l'environnement extérieur, y compris dans les centrales nucléaires anciennes manquant de place pour loger un dispositif à deux échangeurs.The present invention relates to a heat exchange device which has mechanical resistance characteristics to deformations due to the temperature gradient which are as good as those of the exchangers of the prior art and which, while comprising only one exchanger heat, has significantly improved sealing characteristics, so that this heat exchange device, with a single heat exchanger, can be placed in the backup circuits of a nuclear reactor to ensure the cooling of the hot fluid contaminated leaving the reactor enclosure by a cooling fluid, directly from the external environment, including in old nuclear power plants lacking space to house a device with two exchangers.
L'échangeur de chaleur conçu selon l'invention comprend :The heat exchanger designed according to the invention comprises:
- une calandre cylindrique qui définit un récipient ayant un raccord d'entrée (de sortie) du fluide de refroidissement à l'une de ses extrémités, une paire de plaques tubulaires montées dans le récipient. L'une est fixée rigidement à la calandre. L'autre est soudée et sertie à la calandre sur toute sa périphérie et définit, avec un capot de fermeture, une tête flottante dans laquelle est ménagé un raccord pour la sortie (l'entrée) du fluide de refroidissement, - un faisceau de tubes sensiblement parallèles. Les unes des extrémités sont fixées solidement à la plaque tubulaire qui est fixée rigidement à la calandre. Leurs autres extrémités sont serties et soudées sur toute l'épaisseur de la plaque tubulaire qui est soudée et sertie sur toute sa périphérie à la calandre.- a cylindrical shell which defines a container having an inlet (outlet) connection for the coolant at one of its ends, a pair of tubular plates mounted in the container. One is rigidly attached to the grille. The other is welded and crimped to the grille over its entire periphery and defines, with a closing cover, a floating head in which is formed a connector for the outlet (entry) of the coolant, - a bundle of substantially parallel tubes. Some of the ends are fixed firmly to the tube plate which is rigidly fixed to the grille. Their other ends are crimped and welded over the entire thickness of the tube plate which is welded and crimped over its entire periphery to the grille.
Le raccord de sortie (d'entrée) du fluide de refroidissement ménagé dans la tête flottante est constituée au moins en partie d'un soufflet. Le contact soufflet-fluide chaud qui existait selon les brevets de l'art antérieur et qui constituait un point faible d'étanchéité aux substances radioactives est, dans l'échangeur de chaleur, selon l'invention, supprimé.The outlet connection (inlet) of the coolant formed in the floating head consists at least in part of a bellows. The hot bellows-fluid contact which existed according to the patents of the prior art and which constituted a weak point of sealing against radioactive substances is, in the heat exchanger, according to the invention, eliminated.
Il lui a été substitué selon l'invention un contact fluide chaud-plaque sertie et soudée à la calandre nettement plus étanche aux substances radioactives. Cette étanchéité est due au fait que les extrémités des tubes sont soudées et serties à la plaque tubulaire sur toute l'épaisseur de celle-ci et que la plaque tubulaire elle-même est soudée et sertie sur toute la périphérie à la calandre.It was substituted for it according to the invention a hot fluid contact-crimped plate and welded to the radiator grille much more impervious to radioactive substances. This tightness is due to the fact that the ends of the tubes are welded and crimped to the tube plate over the entire thickness of the latter and that the tube plate itself is welded and crimped over the entire periphery to the grille.
Ces soudages pouvaient faire craindre que la plaque tubulaire soit très sensible aux contraintes thermiques qui auraient du porter atteinte à l'étanchéité.These welds could cause fear that the tube plate is very sensitive to thermal stresses which should have affected the seal.
Or, en prévoyant un soufflet pourtant éloigné de 1'espace réservé au fluide chaud mais néanmoins suffisamment proche de la plaque tubulaire, on est parvenu à absorber suffisamment les contraintes thermiques pour que la plaque tubulaire soit protégée de leur effet néfaste, en sorte que le soufflet protège la plaque tubulaire des contraintes thermiques, tandis que la plaque tubulaire protège le soufflet du contact avec du fluide chaud.However, by providing a bellows, however distant from the space reserved for the hot fluid but nevertheless sufficiently close to the tube plate, we have managed to sufficiently absorb the thermal stresses so that the tube plate is protected from their harmful effect, so that the bellows protects the tube plate from thermal stresses, while the tube plate protects the bellows from contact with hot fluid.
Selon un mode de réalisation préféré de l'invention, le soufflet est plus proche selon l'axe de la calandre de la plaque tubulaire soudée et sertie à la calandre que du sommet de la tête flottante. Les déformations dues au gradient de températures étant les plus importantes au niveau du contact de la plaque tubulaire et de la calandre, le fait que le soufflet est au voisinage immédiat de la plaque tubulaire assure que le soufflet encaissera les déformations les plus importantes le plus rapidement possible. Ainsi, selon le mode de réalisation préféré de l'invention, l'échangeur de chaleur est plus étanche et plus résistant mécaniquement que ceux de l'art antérieur, et en particulier, que ceux selon les brevets GB-A-12867222 et US-A-3850231.According to a preferred embodiment of the invention, the bellows is closer along the axis of the grille of the welded tubular plate and crimped to the grille than from the top of the floating head. The deformations due to the temperature gradient being the greatest at the level of the contact of the tube plate and the grille, the fact that the bellows is at immediate vicinity of the tube plate ensures that the bellows will collect the most significant deformations as quickly as possible. Thus, according to the preferred embodiment of the invention, the heat exchanger is more leaktight and more mechanically resistant than those of the prior art, and in particular, than those according to patents GB-A-12867222 and US- A-3850231.
Selon un autre mode de réalisation préféré de l'invention, le raccord associé au soufflet est du même côté de la calandre que le raccord d'entrée du fluide chaud, en particulier, sur la même génératrice de la calandre. Il s'ensuit que le soufflet est à proximité la plus immédiate possible du point de la zone de contact fluide chaud-plaque tubulaire où le gradient de températures est maximal. En plaçant le soufflet aussi près que possible de ce point de la plaque, on s'assure une efficacité encore plus grande du soufflet à encaisser les déformations.According to another preferred embodiment of the invention, the connector associated with the bellows is on the same side of the grille as the inlet connector for the hot fluid, in particular, on the same generator of the grille. It follows that the bellows is as close as possible to the point of the hot fluid-tubular plate contact zone where the temperature gradient is maximum. By placing the bellows as close as possible to this point on the plate, we ensure an even greater effectiveness of the bellows in absorbing deformation.
Ainsi, les caractéristiques d'étanchéité et de résistance mécanique de l'échangeur de chaleur selon l'invention permettent de l'utiliser dans un circuit de secours d'une enceinte d'un réacteur nucléaire qui, dans le cas d'un accident, refroidit le fluide chaud contaminé sortant de l'enceinte par un fluide de refroidissement directement déversable à l'extérieur.Thus, the sealing and mechanical strength characteristics of the heat exchanger according to the invention allow it to be used in a backup circuit of an enclosure of a nuclear reactor which, in the event of an accident, cools the hot contaminated fluid leaving the enclosure with a cooling fluid that can be poured directly outside.
Dans le cas des dispositifs de l'art antérieur, cela n'est pas possible et ces dispositifs doivent être constitués d'au moins deux échangeurs de chaleur afin d'assurer une étanchéité convenable. L'échangeur de chaleur selon l'invention permet ainsi de diminuer les coûts de fabrication d'une centrale nucléaire ou de rénovation des centrales anciennes.In the case of devices of the prior art, this is not possible and these devices must consist of at least two heat exchangers in order to ensure a suitable seal. The heat exchanger according to the invention thus makes it possible to reduce the costs of manufacturing a nuclear power plant or of renovating old power plants.
A la figure du dessin annexé, donné uniquement à titre d'exemple, est représenté un mode de réalisation d'un échangeur de chaleur selon l'invention.In the figure of the appended drawing, given solely by way of example, there is shown an embodiment of a heat exchanger according to the invention.
L'échangeur de chaleur représenté comporte une calandre 1 comportant un faisceau de tubes 2 sensiblement droits pour le passage du fluide de refroidissement. Ce faisceau de tubes 2, qui n'est représenté que partiellement, est monté entre des plaques tubulaires 3. Les tubes 2 sont soudés et sertis sur toute l'épaisseur des plaques tubulaires 3. La calandre 1 est terminée par une tête 4 dans laquelle est prévu un raccord 9 d'entrée (de sortie) du fluide de refroidissement. Un tête 5 est montée flottante la calandre 1. Il est prévu sur la calandre un raccord d'entrée (de sortie) du fluide chaud contaminé. Un raccord 8 de sortie (d'entrée) du fluide refroidissement est prévu sur la tête 5 montée flottante. Le raccord 8 est constitué pour partie d'un soufflet 10.The heat exchanger shown comprises a shell 1 comprising a bundle of tubes 2 that are substantially straight for the passage of the cooling fluid. This bundle of tubes 2, which is only partially shown, is mounted between tubular plates 3. The tubes 2 are welded and crimped over the entire thickness of the tubular plates 3. The calender 1 is terminated by a head 4 in which is provided a connection 9 inlet (outlet) of the coolant. A head 5 is mounted floating on the grille 1. There is provided on the grille an inlet (outlet) connection for the contaminated hot fluid. A connection 8 for the outlet (inlet) of the cooling fluid is provided on the floating mounted head 5. The connector 8 partly consists of a bellows 10.
On définit : - ZZ', l'axe principal de la calandre 1 cylindrique, - XX', l'axe du raccord 8 prévu dans la tête flottante, - YY' , l'axe du raccord 7 prévu dans la calandre pour l'écoulement d'entrée (de sortie) du fluide chaudWe define: - ZZ ', the main axis of the cylindrical grille 1, - XX', the axis of the connector 8 provided in the floating head, - YY ', the axis of the connector 7 provided in the grille for the hot fluid inlet (outlet) flow
Le raccord 8, selon l'axe ZZ' , est plus près de la plaque tubulaire 3 que du sommet de la tête flottante 5.The connector 8, along the axis ZZ ', is closer to the tube plate 3 than to the top of the floating head 5.
Il s'ensuit que le soufflet 10 encaisse plus rapidement les déformations ayant lieu dans la zone de raccord de la plaque tubulaire avec la calandre, zone où le gradient de température est maximal.It follows that the bellows 10 more quickly collects the deformations occurring in the zone of connection of the tube plate with the calender, zone where the temperature gradient is maximum.
Dans le mode de réalisation préféré, l'angle formé dans un plan normal à l'axe ZZ' entre la projection de l'axe XX' sur le plan et la projection de l'axe YY' sur ce même plan, .est nul. Le soufflet se trouve ainsi aussi proche que possible de la zone où le gradient de température est maximal, ce qui lui permet d'encaisser rapidement les déformations. In the preferred embodiment, the angle formed in a plane normal to the axis ZZ 'between the projection of the axis XX' on the plane and the projection of the axis YY 'on this same plane,. Is zero . The bellows is thus as close as possible to the zone where the temperature gradient is maximum, which allows it to quickly absorb the deformations.

Claims

Revendications 1. Echangeur de chaleur, destiné à échanger de manière indirecte de la chaleur entre un fluide chaud et contaminé à refroidir et un fluide de refroidissement, comprenant une calandre (1) cylindrique, définissant un récipient, terminée par une tête (4) dans laquelle est ménagée un raccord (9) d'entrée (de sortie) du fluide de refroidissement, une paire de plaques tubulaires (3) montées dans le récipient, l'une étant fixée rigidement à la calandre et l'autre définissant avec un capot de fermeture une tête flottante (5) dans laquelle débouche un raccord (8) de sortie (d'entrée) pour le fluide de refroidissement, un faisceau de tubes (2) sensiblement parallèles dont les extrémités opposées sont fixées aux plaques tubulaires, un raccord (7) d'entrée dans le récipient du fluide chaud contaminé, ménagé dans la calandre, un raccord (6) de sortie du récipient du fluide chaud contaminé, ménagé dans la calandre, un raccord (11) d'écoulement du fluide de refroidissement constitué au moins en partie d'un soufflet (10) , caractérisé en ce que les tubes (2) formant le faisceau de tubes sont soudés et sertis sur toute l'épaisseur de la plaque tubulaire qui définit avec le capot de fermeture la tête flottante (5) et cette plaque tubulaire est également soudée et sertie à la calandre sur toute sa périphérie. Claims 1. Heat exchanger, intended to exchange heat indirectly between a hot and contaminated fluid to be cooled and a cooling fluid, comprising a cylindrical shell (1), defining a container, terminated by a head (4) in which is formed a connection (9) inlet (outlet) of the coolant, a pair of tubular plates (3) mounted in the container, one being rigidly fixed to the shell and the other defining with a cover closing a floating head (5) into which opens an outlet (inlet) connection (8) for the coolant, a bundle of substantially parallel tubes (2) whose opposite ends are fixed to the tubular plates, a fitting (7) inlet into the container of the contaminated hot fluid, formed in the shell, a connector (6) outlet of the container of the contaminated hot fluid, formed in the shell, a connector (11) for the flow of the f the cooling medium consisting at least in part of a bellows (10), characterized in that the tubes (2) forming the bundle of tubes are welded and crimped over the entire thickness of the tubular plate which defines with the closure cover the floating head (5) and this tubular plate is also welded and crimped to the grille over its entire periphery.
2. Echangeur de chaleur selon la revendication 1, caractérisé en ce que le raccord (11) constitué au moins en partie d'un soufflet (10) est, selon l'axe de la calandre, plus près de la plaque tubulaire qui est soudée et sertie à la calandre que du sommet de la tête flottante.2. Heat exchanger according to claim 1, characterized in that the connector (11) consisting at least in part of a bellows (10) is, along the axis of the grille, closer to the tube plate which is welded and crimped to the grille only from the top of the floating head.
3. Echangeur de chaleur selon la revendication 1 ou 2, caractérisé en ce que le raccord (11) et le raccord3. Heat exchanger according to claim 1 or 2, characterized in that the connector (11) and the connector
(7) sont sur une même génératrice du cylindre. (7) are on the same generator of the cylinder.
EP95902175A 1993-05-26 1994-11-25 Heat exchanger for a contaminated fluid Expired - Lifetime EP0740767B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9306307A FR2705769B1 (en) 1993-05-26 1993-05-26 Heat exchanger for contaminated fluid.
PCT/FR1994/001375 WO1996017216A1 (en) 1993-05-26 1994-11-25 Heat exchanger for a contaminated fluid

Publications (2)

Publication Number Publication Date
EP0740767A1 true EP0740767A1 (en) 1996-11-06
EP0740767B1 EP0740767B1 (en) 2001-02-28

Family

ID=26230356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95902175A Expired - Lifetime EP0740767B1 (en) 1993-05-26 1994-11-25 Heat exchanger for a contaminated fluid

Country Status (7)

Country Link
EP (1) EP0740767B1 (en)
BG (1) BG63057B1 (en)
DE (1) DE69426781D1 (en)
FR (1) FR2705769B1 (en)
RU (1) RU2145697C1 (en)
SK (1) SK91996A3 (en)
WO (1) WO1996017216A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2705769B1 (en) * 1993-05-26 1995-08-11 Electricite De France Heat exchanger for contaminated fluid.
EP1189008B1 (en) * 2000-09-15 2003-11-26 Toyo Radiator Co., Ltd. Heat exchanger
CN109458861B (en) * 2018-12-18 2023-10-10 营口庆营石化设备有限公司 Floating head heat exchanger with double sealing
RU2725120C1 (en) * 2019-09-23 2020-06-29 Общество с ограниченной ответственностью "Полесье" (ООО "Полесье") Heat exchanger

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR712359A (en) * 1931-02-28 1931-10-01 Delas Condenseurs Improvement of surface condensers and similar devices comprising tubes rigidly fixed at both ends
FR1286722A (en) * 1961-01-20 1962-03-09 Buckley & Taylor Ltd Improvements to heat exchangers, condensers and the like
US3857442A (en) * 1971-04-12 1974-12-31 Westinghouse Electric Corp Heat exchanger having a head with an integral radiation shield
US3850231A (en) * 1973-05-24 1974-11-26 Combustion Eng Lmfbr intermediate heat exchanger
FR2431346A1 (en) * 1978-07-18 1980-02-15 British Nuclear Fuels Ltd Tube bundle for heat exchanger - made by welding into tube-plate hole flange formed by machining weld material deposited around tube end, improving corrosion resistance
FR2705769B1 (en) * 1993-05-26 1995-08-11 Electricite De France Heat exchanger for contaminated fluid.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9617216A1 *

Also Published As

Publication number Publication date
WO1996017216A1 (en) 1996-06-06
BG100732A (en) 1997-03-31
BG63057B1 (en) 2001-02-28
EP0740767B1 (en) 2001-02-28
SK91996A3 (en) 1997-10-08
FR2705769A1 (en) 1994-12-02
RU2145697C1 (en) 2000-02-20
FR2705769B1 (en) 1995-08-11
DE69426781D1 (en) 2001-04-05

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