EP0250319B1 - Steam generator with improved drying means - Google Patents

Steam generator with improved drying means Download PDF

Info

Publication number
EP0250319B1
EP0250319B1 EP19870401361 EP87401361A EP0250319B1 EP 0250319 B1 EP0250319 B1 EP 0250319B1 EP 19870401361 EP19870401361 EP 19870401361 EP 87401361 A EP87401361 A EP 87401361A EP 0250319 B1 EP0250319 B1 EP 0250319B1
Authority
EP
European Patent Office
Prior art keywords
elementary
dryers
steam
layers
dryer
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.)
Expired - Lifetime
Application number
EP19870401361
Other languages
German (de)
French (fr)
Other versions
EP0250319A1 (en
Inventor
Jean Claude Fenet
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0250319A1 publication Critical patent/EP0250319A1/en
Application granted granted Critical
Publication of EP0250319B1 publication Critical patent/EP0250319B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/26—Steam-separating arrangements
    • F22B37/28—Steam-separating arrangements involving reversal of direction of flow
    • F22B37/286—Steam-separating arrangements involving reversal of direction of flow specially adapted for steam generators of nuclear power plants

Definitions

  • the present invention relates to a steam generator equipped with drying means of a new type, with increased efficiency.
  • the steam used to drive the turbines of the electric generator is created in a steam generator.
  • steam generator designates here any component in which water penetrating in the liquid state emerges in the vapor state under the effect of its heating.
  • a component can therefore be a heat exchanger in which a primary fluid, heated for example in the core of a nuclear reactor, in turn heats the water in the secondary circuit. It can also be the main tank of a boiling water nuclear reactor, in which the water heats up directly by passing through the reactor core.
  • the separators are constituted by juxtaposed vertical tubes, in which are placed helical fins centrifuging the water-vapor mixture, and allowing thus to separate most of the water entrained by the vapor.
  • the steam always charged with humidity leaving through the upper end of the tubes passes through then the drying device, consisting of chicane passages formed between lamellae in the form of rafters.
  • the shape of the baffles is such that a part of the water droplets entrained by the vapor is separated from the latter and descends towards the steam production zone.
  • the poor efficiency of this drying device is mainly explained by the fact that the separation of the water droplets is obtained by circulating the steam horizontally inside the baffles.
  • the force of inertia due to the change in curvature and the force of gravity, which act simultaneously on each water droplet are therefore directed in two different directions, approximately perpendicular.
  • the modulus of the resultant of these two forces, which determines the separating power of the device is therefore much lower than the sum of the modules of these two forces, which corresponds to the maximum theoretical separating power.
  • the water droplets are not immediately withdrawn from the action of the surrounding vapor, so that part of them can be again entrained by the vapor.
  • the effectiveness of the device is also limited by this phenomenon.
  • drying means intended for a steam generator, consisting of elementary dryers arranged in several layers superposed according to a regular network offset from one layer to another.
  • Each elementary dryer is formed by two curved plates forming an upper part flared upwards and a central part separated by a clearance from the edges of the upper parts of the adjacent elementary dryers of the immediately lower layer. Drainage channels are placed below the dryer layers.
  • the invention specifically relates to a steam generator equipped with improved dryers in which the separation of the water droplets is obtained by subjecting the steam to successive changes of direction at 180 ° and by circulating the steam from bottom to top , so that the force of gravity acting on each water droplet is added to the force of inertia due to the change of direction, to give the separation maximum efficiency.
  • the invention also relates to a steam generator, the dryers of which are designed so as to immediately remove the water droplets from the action of steam.
  • the drying means comprise juxtaposed interchangeable baskets, each containing several layers of elementary dryers.
  • the interchangeable baskets then have a horizontal hexagonal section.
  • the separation means comprising in known manner helical fins arranged in vertical tubes, the interchangeable baskets also contain elementary drainage channels and extend downward so as to surround and support the upper end of one of the tubes, delimiting therewith an annular space for the return of water, into which the elementary drainage channels open.
  • This steam generator is intended in particular to be used for ensuring the exchange of heat between a primary fluid previously heated in a nuclear reactor and a secondary fluid consisting of water.
  • the invention is not limited to this type of steam generator and also covers the case where the primary fluid is removed, the heat source constituted for example by the core of a reactor with boiling water being placed directly inside the outer casing of the steam generator, which then constitutes the main tank of the reactor.
  • the steam generator shown in Figure 1 conventionally comprises an outer casing 10 having a symmetry of revolution about a vertical axis.
  • a bundle of inverted U-shaped tubes 12 In the lower part of the enclosed volume delimited by the envelope 10 is housed a bundle of inverted U-shaped tubes 12, the ends of which are fixed in a sealed manner on a horizontal tube plate 14, itself fixed in a sealed manner to the envelope 10 near the hemispherical bottom 10a thereof.
  • the ends of the tubes 12 open respectively into an inlet chamber 16 and into an outlet chamber 18 of primary fluid, these two chambers being formed between the tube plate 14 and the hemispherical bottom 10a, and separated by a partition 20.
  • the entry of the primary fluid into the chamber 16 and the exit of this fluid from the chamber 18 are done respectively by an inlet pipe 22 and by an outlet pipe 24 formed in the bottom 10a of the envelope.
  • Tubing 22 and 24 are designed to be connected to an external circuit in which there is for example a tank containing the core of a nuclear reactor.
  • the relatively hot primary fluid entering the chamber 16 circulates in the bundle of tubes 12 before being evacuated by the outlet chamber 18.
  • the bundle of tubes 12 therefore constitutes inside the outer envelope 10 a source of heat used to vaporize the water in the secondary circuit.
  • the admission of the water from the secondary circuit in the liquid state to the inside of the envelope 10 of the steam generator is done by an inlet pipe 26 located immediately above the tube plate 14.
  • L water in the liquid state penetrating through the tubing 26 travels from bottom to top around the tubes 12, taking part of the heat of the water conveyed by the primary fluid circulating in these tubes.
  • the bundle of tubes 12 thus constitutes a zone for producing steam.
  • the vapor thus formed then circulates successively from bottom to top in a separating device 28, then in a drying device 30, before escaping at the upper end of the casing 10 by a steam outlet pipe 32.
  • a water / steam circuit comprising in particular a turbo-alternator assembly producing the desired electrical energy.
  • the bundle of tubes 12 is housed in a cylindrical inner envelope 34 defining with the outer envelope 10 an annular space 36.
  • the separator device 28 comprises vertical tubes 38 connected directly to the upper part of the inner envelope 34. Inside the tubes 38, part of the water droplets is separated from the vapor by helical fins . The water thus separated from the steam returns directly to the steam production zone delimited by the inner envelope 34.
  • the drying device 30 mainly comprises several horizontal layers of elementary dryers 40, the elemental dryers of each layer being arranged in a regular network, preferably with triangular or square meshes.
  • the elementary dryers are offset so that the dryers of a given layer are vertical to the center of the mesh of the dryers of the two immediately adjacent layers.
  • the elementary dryers of the successive layers are nested one inside the other, as clearly shown in FIG. 2.
  • each of the elementary dryers 40 has approximately the shape of a funnel with a vertical axis.
  • each elementary dryer 40 comprises an upper portion 40a approximately frustoconical, an outer peripheral edge 40b facing downwards and a central portion 40c approximately tubular.
  • the upper part 40a very flared, drains on its upper face the water droplets towards the central part 40c, which borders it internally.
  • the lower face of the part 40a extended externally by the edge 40b, forces the current of steam rising in the steam generator to effect a change of direction at 180 °.
  • the length of the central tubular part 40c of each elementary separator 40 is such that its lower end penetrates into the upper end of the corresponding part 40c of the elementary dryer 40 with which it is vertically aligned, two layers below. To this end, the diameter of the part 40c gradually decreases downward, so as to leave a clearance between the lower end of the part. 40c of a given elementary dryer and the upper end of the part 40c of the dryer into which this lower end penetrates.
  • This game makes it possible to drain the drops of water collected by the parts 40c, as illustrated by the arrows F1 in FIG. 2.
  • each of the elemental dryers 40 and the size of the meshes according to which these dryers are arranged in each of the layers are such that there is also a certain clearance between the tubular part 40c of each elementary dryer and the peripheral edge. outside 40b of the elementary dryers of the immediately lower layer.
  • the length of the outer peripheral edge 40b of the elementary dryers is such that there is also a clearance between the lower end of these edges and the parts 40a of the elementary dryers of the layer of dryers situated immediately below.
  • this result is obtained by simply resting by gravity the elementary dryers of a given layer on the dryers of the adjacent lower layer, by virtue of the approximately frustoconical character of the parts 40a.
  • the water vapor coming from the separator assembly 28 and flowing from bottom to top undergoes a change of direction approximately 180 ° each time it strikes the upper part 40a extended by the edge 40b d 'an elementary dryer.
  • the slightly flared shape of the part 40a deflects the vapor radially outwards relative to the vertical axis of the corresponding elementary dryer, towards the inverted edge 40b. The latter then forces the vapor to descend before resuming its upward path to the elemental dryers of the upper layer.
  • the water droplets separated from the vapor by each of the elementary dryers 40 fall on the upper part 40a of the elementary dryers of the adjacent lower layer by subtracting the separated water droplets steam entrainment.
  • the water separated from the steam is then conveyed by the tubular central parts 40c of the elementary dryers to drainage channels 42 extending horizontally over the entire width of the steam generator (FIG. 1) and into which the lower ends penetrate. tubular parts 40c of the elemental dryers forming the two lower layers of the stack.
  • the drainage channels 42 are fitted with pipes 44 (FIG. 1) making it possible to convey the water thus drained to above the annular space 36 delimited between the envelopes 34 and 10.
  • the separated water steam thus descends to the lower part of the steam generator to be mixed with the feed water entering through the pipe 26.
  • each of the drainage channels 42 is inclined radially towards the outside of the exchanger to facilitate the flow of water to the pipes 44 forming the return passages. water to the steam generator area.
  • the drying assembly 30 can consist of interchangeable modular baskets 46 in each of which is housed a certain number of elementary dryers 40.
  • the baskets 46 preferably have a hexagonal shape in horizontal section.
  • the drainage channels 42 remain fixedly mounted inside the casing 10 of the generator.
  • each of the interchangeable modular baskets comprises both a stack of several layers of elementary dryers 40, a set of elementary drainage channels 42 and a tube 38 of the separator device 28.
  • the dryers 40 are here again housed in a basket 46 having a horizontal hexagonal section, this basket extending downward so that there are housed drainage channels 42 of reduced length ( Figure 5) , as well as the upper end of one of the tubes 38.
  • the diameter of the tube 38 is such that it fits entirely inside the lower part of the basket 46, delimiting therewith an annular space 44a in which the ends of the drainage channels 42 open out through holes 42a.
  • This annular space 44a then constitutes the return passage of the water towards the steam production zone and thus replaces the pipes 44 of FIG. 1.
  • each of the tubes 38 is fixed to the corresponding basket 46, so that the removal of the latter makes it possible to maintain the dryers and the corresponding separator.
  • the particular shape of the elementary dryers 40 described above should not be considered as limiting, the only double condition that must meet these dryers being to ensure a return to about 180 ° of the ascending steam flow as well as a return of the water separated from the steam in the drainage channels 42.
  • the upper part 40a of the elementary dryers can have a circular arc section allowing the tubular part 40c to be connected to the peripheral edge 40b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Description

La présente invention concerne un générateur de vapeur équipé de moyens de séchage d'un type nouveau, à efficacité accrue.The present invention relates to a steam generator equipped with drying means of a new type, with increased efficiency.

Dans les centrales électriques utilisant comme source d'énergie la chaleur dégagée par exemple par la réaction de fission produite dans un réacteur nucléaire, la vapeur servant à entraîner les turbines de l'alternateur électrique est créée dans un générateur de vapeur.In power plants using the heat given off, for example by the fission reaction produced in a nuclear reactor, the steam used to drive the turbines of the electric generator is created in a steam generator.

L'expression "générateur de vapeur" désigne ici tout composant dans lequel de l'eau pénétrant à l'état liquide ressort à l'état de vapeur sous l'effet de son échauffement. Un tel composant peut donc être un échangeur de chaleur dans lequel un fluide primaire, réchauffé par exemple dans le coeur d'un réacteur nucléaire, échauffe à son tour l'eau du circuit secondaire. Il peut également s'agir de la cuve principale d'un réacteur nucléaire à eau bouillante, dans lequel l'eau se réchauffe directement en traversant le coeur du réacteur.The expression “steam generator” designates here any component in which water penetrating in the liquid state emerges in the vapor state under the effect of its heating. Such a component can therefore be a heat exchanger in which a primary fluid, heated for example in the core of a nuclear reactor, in turn heats the water in the secondary circuit. It can also be the main tank of a boiling water nuclear reactor, in which the water heats up directly by passing through the reactor core.

Dans les appareils de ce type, la vapeur produite est fortement chargée en humidité. Avant d'être admise dans les turbines, le taux d'humidité doit donc être réduit dans des proportions importantes.In devices of this type, the vapor produced is highly charged with moisture. Before being admitted to turbines, the humidity must therefore be reduced considerably.

A cet effet, on place généralement dans l'enveloppe extérieure des générateurs de vapeur, au-dessus de la zone de production de vapeur, des dispositifs appelés "séparateurs" et servant à extraire de la vapeur une partie de l'eau entraînée par celle-ci, et des dispositifs appelés "sécheurs" réduisant encore le taux d'humidité de la vapeur produite.For this purpose, generally placed in the outer envelope of the steam generators, above the steam production zone, devices called "separators" and serving to extract from the steam part of the water entrained by that -ci, and devices called "dryers" further reducing the humidity of the steam produced.

Dans l'état actuel de la technique illustrée notamment par la demande de brevet européen EP-A-0 043 760, les séparateurs sont constitués par des tubes verticaux juxtaposés, dans lesquels sont placées des ailettes hélicoïdales centrifugeant le mélange eau-­vapeur, et permettant ainsi de séparer la plus grande partie de l'eau entraînée par la vapeur. La vapeur toujours chargée d'humidité sortant par l'extrémité supérieure des tubes traverse ensuite le dispositif de séchage, constitué de passages en chicane formés entre des lamelles en forme de chevrons. La forme des chicanes est telle qu'une partie des gouttelettes d'eau entraînées par la vapeur est séparée de celle-ci et redescend vers la zone de production de vapeur.In the current state of the art illustrated in particular by European patent application EP-A-0 043 760, the separators are constituted by juxtaposed vertical tubes, in which are placed helical fins centrifuging the water-vapor mixture, and allowing thus to separate most of the water entrained by the vapor. The steam always charged with humidity leaving through the upper end of the tubes passes through then the drying device, consisting of chicane passages formed between lamellae in the form of rafters. The shape of the baffles is such that a part of the water droplets entrained by the vapor is separated from the latter and descends towards the steam production zone.

Dans un générateur de vapeur de ce type, une bonne efficacité du dispositif de séchage ne peut être obtenue qu'au prix d'un encombrement relativement important.In a steam generator of this type, good efficiency of the drying device can only be obtained at the cost of a relatively large bulk.

L'efficacité médiocre de ce dispositif de séchage s'explique principalement par le fait que la séparation des gouttelettes d'eau est obtenue en faisant circuler la vapeur horizontalement à l'intérieur des chicanes. Lorsque la vapeur heurte la paroi de la chicane, la force d'inertie due au changement de courbure et la force de pesanteur, qui agissent simultané­ment sur chaque gouttelette d'eau, sont donc dirigées selon deux directions différentes, approximativement perpendiculaires. Le module de la résultante de ces deux forces, qui détermine le pouvoir séparateur du dispositif, est donc très inférieur à la somme des modules de ces deux forces, qui correspond au pouvoir séparateur théorique maximum.The poor efficiency of this drying device is mainly explained by the fact that the separation of the water droplets is obtained by circulating the steam horizontally inside the baffles. When the steam hits the wall of the baffle, the force of inertia due to the change in curvature and the force of gravity, which act simultaneously on each water droplet, are therefore directed in two different directions, approximately perpendicular. The modulus of the resultant of these two forces, which determines the separating power of the device, is therefore much lower than the sum of the modules of these two forces, which corresponds to the maximum theoretical separating power.

De plus, après avoir été séparées de la vapeur, les gouttelettes d'eau ne sont pas immédiatement soustraites à l'action de la vapeur environnante, de sorte qu'une partie d'entre elles peut être à nouveau entraînée par la vapeur. L'efficacité du dispositif est également limitée par ce phénomène.In addition, after being separated from the vapor, the water droplets are not immediately withdrawn from the action of the surrounding vapor, so that part of them can be again entrained by the vapor. The effectiveness of the device is also limited by this phenomenon.

Dans le document DE-A-2 004 498, il est décrit des moyens de séchage destinés à un générateur de vapeur, constitués de sécheurs élémentaires disposés en plusieurs couches superposées selon un réseau régulier décalé d'une couche à l'autre. Chaque sécheur élémentaire est formé de deux plaques incurvées formant une partie supérieure évasée vers le haut et une partie centrale séparée par un jeu des bords des parties supérieures des sécheurs élémentaires adjacents de la couche immédia­tement inférieure. Des canaux de drainage sont placés en dessous des couches de sécheurs.In document DE-A-2 004 498, there is described drying means intended for a steam generator, consisting of elementary dryers arranged in several layers superposed according to a regular network offset from one layer to another. Each elementary dryer is formed by two curved plates forming an upper part flared upwards and a central part separated by a clearance from the edges of the upper parts of the adjacent elementary dryers of the immediately lower layer. Drainage channels are placed below the dryer layers.

L'invention a précisément pour objet un générateur de vapeur équipé de sécheurs perfectionnés dans lesquels la séparation des gouttelettes d'eau est obtenue en faisant subir à la vapeur des changements de direction successifs à 180° et en faisant circuler la vapeur de bas en haut, de telle sorte que la force de pesanteur agissant sur chaque gouttelette d'eau s'ajoute à la force d'inertie due au changement de direction, pour donner à la séparation une efficacité maximum. L'invention a aussi pour objet un générateur de vapeur dont les sécheurs sont conçus de façon à soustraire immédiatement les gouttelettes d'eau à l'action de la vapeur.The invention specifically relates to a steam generator equipped with improved dryers in which the separation of the water droplets is obtained by subjecting the steam to successive changes of direction at 180 ° and by circulating the steam from bottom to top , so that the force of gravity acting on each water droplet is added to the force of inertia due to the change of direction, to give the separation maximum efficiency. The invention also relates to a steam generator, the dryers of which are designed so as to immediately remove the water droplets from the action of steam.

A cet effet et conformément à l'invention, il est proposé un générateur de vapeur comprenant une enveloppe extérieure renfermant, en partant du bas, une zone de production de vapeur chargée d'eau, des moyens de séparation d'une partie de l'eau entraînée par la vapeur, et des moyens de séchage de la vapeur, dans lequel :

  • les moyens de séchage de la vapeur comprennent plusieurs couches horizontales superposées de sécheurs élémentaires disposés selon un réseau régulier, de maille donnée, ce réseau étant identique et décalé d'une couche à l'autre, de sorte que les sécheurs élémentaires de chacune des couches sont situés à la verticale du centre des mailles des couches adjacentes, chaque sécheur élémentaire ayant une partie supérieure évasée de bas en haut et prolongée intérieurement vers le bas par une partie centrale ;
  • un jeu est ménagé entre la partie centrale de chaque sécheur élémentaire et le bord de la partie supérieure des sécheurs élémentaires de la couche immédiatement inférieure ;
  • les moyens de séchage comprennent de plus des canaux de drainage d'eau situés sous les couches de sécheurs et débouchant dans des passages de retour d'eau descendant vers la zone de production de vapeur ; caractérisé par le fait que chaque sécheur élémentaire a approximativement la forme d'un entonnoir d'axe vertical, comprenant une partie supérieure sensiblement tronconique délimitée extérieurement par un bord périphé­rique extérieur retourné vers le bas et prolongée intérieurement vers le bas par une partie tubulaire centrale, les parties tubulaires centrales des sécheurs élémentaires des deux couches les plus basses plongeant toutes dans l'un des canaux de drainage ; et par le fait que les sécheurs élémentaires des couches successives sont emboîtés les uns dans les autres, de manière à ce que l'extrémité inférieure de la partie centrale de chaque sécheur élémentaire pénètre dans l'extrémité supérieure de la partie correspondante du sécheur élémentaire avec lequel il est aligné, deux couches plus bas.
To this end and in accordance with the invention, a steam generator is proposed comprising an outer envelope containing, starting from the bottom, a steam-producing zone charged with water, means for separating part of the water entrained by steam, and means for drying the steam, in which:
  • the steam drying means comprise several superimposed horizontal layers of elementary dryers arranged in a regular network, of given mesh, this network being identical and offset from one layer to another, so that the elemental dryers of each of the layers are located vertically from the center of the mesh of the adjacent layers, each elementary dryer having an upper part flared from bottom to top and extended internally downwards by a central part;
  • a clearance is provided between the central part of each elementary dryer and the edge of the upper part of the elemental dryers of the immediately lower layer;
  • the drying means further comprise water drainage channels situated under the layers of driers and opening into return water passages descending towards the steam production zone; characterized by the fact that each elementary dryer has approximately the shape of a funnel with a vertical axis, comprising a substantially frustoconical upper part delimited externally by an external peripheral edge turned downwards and extended internally downwards by a central tubular part, the central tubular parts of the elementary dryers of the two lowest layers all plunging into one of the drainage channels; and by the fact that the elementary dryers of the successive layers are nested one inside the other, so that the lower end of the central part of each elementary dryer penetrates into the upper end of the corresponding part of the elementary dryer with which it is aligned, two layers below.

Dans l'empilement ainsi constitué, la vapeur circulant de bas en haut vient heurter la partie supérieu­re sensiblement tronconique de chaque sécheur élémentaire. Pour contourner le bord périphérique extérieur retourné vers le bas, la vapeur change de direction à 180°, avant de reprendre sa progression vers le haut jusqu'à la couche de sécheurs élémentaires immédiatement supérieu­re. Sous l'effet de ce changement de direction à 180°, les gouttelettes d'eau sont soumises à une force d'inertie orientée verticalement vers le bas, qui vient donc s'ajouter à la force de pesanteur. Le pouvoir séparateur atteint ainsi sa valeur maximum possible. De plus, les gouttelettes d'eau ainsi séparées de l'écoulement de vapeur tombent sur la partie supérieure sensiblement tronconique du sécheur élémentaire situé immédiatement en-dessous, pour redescendre par la partie tubulaire centrale de ce sécheur, alors que la vapeur circule autour des parties tubulaires des sécheurs. Le réentraînement des gouttelettes d'eau par la vapeur est ainsi empêché.In the stack thus formed, the steam flowing from bottom to top strikes the substantially frustoconical upper part of each elementary dryer. To bypass the outer peripheral edge turned down, the vapor changes direction 180 °, before resuming its progression upwards to the layer of elementary dryers immediately above. Under the effect of this 180 ° change of direction, the water droplets are subjected to an inertial force oriented vertically downwards, which therefore adds to the force of gravity. Separating power thus reaches its maximum possible value. In addition, the water droplets thus separated from the steam flow fall on the substantially frustoconical upper part of the elementary dryer situated immediately below, to descend via the central tubular part of this dryer, while the steam circulates around the tubular parts of dryers. The re-entrainment of water droplets by steam is thus prevented.

Dans un mode de réalisation particulier de l'invention, les moyens de séchage comprennent des paniers interchangeables juxtaposés, contenant chacun plusieurs couches de sécheurs élémentaires. De préférence, les paniers interchangeables ont alors une section horizontale hexagonale.In a particular embodiment of the invention, the drying means comprise juxtaposed interchangeable baskets, each containing several layers of elementary dryers. Preferably, the interchangeable baskets then have a horizontal hexagonal section.

Dans une variante de réalisation, les moyens de séparation comprenant de façon connue des ailettes hélicoïdales disposées dans des tubes verticaux, les paniers interchangeables contiennent également des canaux de drainage élémentaires et se prolongent vers le bas de façon à entourer et à supporter l'extrémité supérieure de l'un des tubes, en délimitant avec celui-ci un espace annulaire de retour de l'eau, dans lequel débouchent les canaux de drainage élémentaires.In an alternative embodiment, the separation means comprising in known manner helical fins arranged in vertical tubes, the interchangeable baskets also contain elementary drainage channels and extend downward so as to surround and support the upper end of one of the tubes, delimiting therewith an annular space for the return of water, into which the elementary drainage channels open.

On décrira maintenant, à titre d'exemple non limitatif, différents modes de réalisation de l'invention en se référant aux dessins annexés dans lesquels :

  • la figure 1 est une vue en coupe verticale schématique d'un générateur de vapeur réalisé conformément à la présente invention,
  • la figure 2 est une vue en coupe verticale à plus grande échelle représentant une partie des moyens de séchage utilisés dans le générateur de vapeur de la figure 1, conformément à l'invention,
  • la figure 3 est une vue en perspective représentant de façon schématique une variante de réalisation de l'invention, selon laquelle les sécheurs élémentaires sont placés dans des paniers modulaires interchangeables,
  • la figure 4 est une vue en coupe verticale schématique représentant une autre variante de réalisation de l'invention, dans laquelle des paniers modulaires contiennent à la fois les moyens de séchage et les séparateurs, et
  • la figure 5 est une vue en coupe à plus grande échelle, selon la ligne V-V de la figure 4.
Various embodiments of the invention will now be described, by way of non-limiting example, with reference to the appended drawings in which:
  • FIG. 1 is a schematic vertical section view of a steam generator produced in accordance with the present invention,
  • FIG. 2 is a view in vertical section on a larger scale showing part of the drying means used in the steam generator of FIG. 1, in accordance with the invention,
  • FIG. 3 is a perspective view schematically showing an alternative embodiment of the invention, according to which the elementary dryers are placed in interchangeable modular baskets,
  • FIG. 4 is a schematic vertical sectional view showing another alternative embodiment of the invention, in which modular baskets contain both the drying means and the separators, and
  • FIG. 5 is a sectional view on a larger scale, along the line VV of FIG. 4.

Sur la figure 1, on a représenté un générateur de vapeur réalisé conformément aux enseignements de l'invention.In Figure 1, there is shown a steam generator produced in accordance with the teachings of the invention.

Ce générateur de vapeur est destiné notamment à être utilisé pour assurer l'échange de chaleur entre un fluide primaire préalablement réchauffé dans un réacteur nucléaire et un fluide secondaire constitué par de l'eau. Comme on l'a mentionné précédemment, l'invention n'est pas limitée à ce type de générateur de vapeur et couvre également le cas où le fluide primaire est supprimé, la source de chaleur constituée par exemple par le coeur d'un réacteur à eau bouillante étant placée directement à l'intérieur de l'enveloppe extérieure du générateur de vapeur, qui constitue alors la cuve principale du réacteur.This steam generator is intended in particular to be used for ensuring the exchange of heat between a primary fluid previously heated in a nuclear reactor and a secondary fluid consisting of water. As mentioned previously, the invention is not limited to this type of steam generator and also covers the case where the primary fluid is removed, the heat source constituted for example by the core of a reactor with boiling water being placed directly inside the outer casing of the steam generator, which then constitutes the main tank of the reactor.

Le générateur de vapeur représenté sur la figure 1 comprend de façon classique une enveloppe extérieure 10 présentant une symétrie de révolution autour d'un axe vertical.The steam generator shown in Figure 1 conventionally comprises an outer casing 10 having a symmetry of revolution about a vertical axis.

Dans la partie inférieure du volume clos délimité par l'enveloppe 10 est logé un faisceau de tubes en U renversé 12, dont les extrémités sont fixées de façon étanche sur une plaque à tubes horizontale 14, elle-même fixée de façon étanche à l'enveloppe 10 à proximité du fond hémisphérique 10a de celle-ci. Les extrémités des tubes 12 débouchent respectivement dans une chambre d'entrée 16 et dans une chambre de sortie 18 de fluide primaire, ces deux chambres étant formées entre la plaque à tubes 14 et le fond hémisphérique 10a, et séparées par une cloison 20.In the lower part of the enclosed volume delimited by the envelope 10 is housed a bundle of inverted U-shaped tubes 12, the ends of which are fixed in a sealed manner on a horizontal tube plate 14, itself fixed in a sealed manner to the envelope 10 near the hemispherical bottom 10a thereof. The ends of the tubes 12 open respectively into an inlet chamber 16 and into an outlet chamber 18 of primary fluid, these two chambers being formed between the tube plate 14 and the hemispherical bottom 10a, and separated by a partition 20.

L'entrée du fluide primaire dans la chambre 16 et la sortie de ce fluide hors de la chambre 18 se font respectivement par une tubulure d'entrée 22 et par une tubulure de sortie 24 formées dans le fond 10a de l'enveloppe. Les tubulures 22 et 24 sont prévues pour être reliées à un circuit extérieur dans lequel se trouve par exemple une cuve contenant le coeur d'un réacteur nucléaire. Le fluide primaire relativement chaud pénétrant dans la chambre 16 circule dans le faisceau de tubes 12 avant d'être évacué par la chambre de sortie 18. Le faisceau de tubes 12 constitue donc à l'intérieur de l'enveloppe extérieure 10 une source de chaleur servant à vaporiser l'eau du circuit secondaire.The entry of the primary fluid into the chamber 16 and the exit of this fluid from the chamber 18 are done respectively by an inlet pipe 22 and by an outlet pipe 24 formed in the bottom 10a of the envelope. Tubing 22 and 24 are designed to be connected to an external circuit in which there is for example a tank containing the core of a nuclear reactor. The relatively hot primary fluid entering the chamber 16 circulates in the bundle of tubes 12 before being evacuated by the outlet chamber 18. The bundle of tubes 12 therefore constitutes inside the outer envelope 10 a source of heat used to vaporize the water in the secondary circuit.

L'admission de l'eau du circuit secondaire à l'état liquide à l'intérieur de l'enveloppe 10 du générateur de vapeur se fait par une tubulure d'entrée 26 située immédiatement au-­dessus de la plaque à tubes 14. L'eau à l'état liquide pénétrant par la tubulure 26 chemine de bas en haut autour des tubes 12, en prélevant une partie de la chaleur de l'eau véhiculée par le fluide primaire circulant dans ces tubes. Le faisceau de tubes 12 constitue ainsi une zone de production de vapeur.The admission of the water from the secondary circuit in the liquid state to the inside of the envelope 10 of the steam generator is done by an inlet pipe 26 located immediately above the tube plate 14. L water in the liquid state penetrating through the tubing 26 travels from bottom to top around the tubes 12, taking part of the heat of the water conveyed by the primary fluid circulating in these tubes. The bundle of tubes 12 thus constitutes a zone for producing steam.

Dans la partie supérieure du volume clos délimité par l'enveloppe extérieure 10, la vapeur ainsi formée circule ensuite successivement de bas en haut dans un dispositif séparateur 28, puis dans un dispositif de séchage 30, avant de s'échapper à l'extrémité supérieure de l'enveloppe 10 par une tubulure de sortie de vapeur 32.In the upper part of the enclosed volume delimited by the outer envelope 10, the vapor thus formed then circulates successively from bottom to top in a separating device 28, then in a drying device 30, before escaping at the upper end of the casing 10 by a steam outlet pipe 32.

Sur les tubulures 26 et 32 est raccordé de façon classique un circuit eau/vapeur comprenant notamment un ensemble turbo-alternateur produisant l'énergie électrique désirée.On the pipes 26 and 32 is conventionally connected a water / steam circuit comprising in particular a turbo-alternator assembly producing the desired electrical energy.

A l'intérieur de l'enveloppe 10, le faisceau de tubes 12 est logé dans une enveloppe intérieure cylindrique 34 délimitant avec l'enveloppe extérieure 10 un espace annulaire 36.Inside the envelope 10, the bundle of tubes 12 is housed in a cylindrical inner envelope 34 defining with the outer envelope 10 an annular space 36.

De façon connue, le dispositif séparateur 28 comprend des tubes verticaux 38 raccordés directement sur la partie supérieure de l'enveloppe intérieure 34. A l'intérieur des tubes 38, une partie des gouttelettes d'eau est séparée de la vapeur par des ailettes hélicoïdales. L'eau ainsi séparée de la vapeur retourne directement dans la zone de production de vapeur délimitée par l'enveloppe intérieure 34.In known manner, the separator device 28 comprises vertical tubes 38 connected directly to the upper part of the inner envelope 34. Inside the tubes 38, part of the water droplets is separated from the vapor by helical fins . The water thus separated from the steam returns directly to the steam production zone delimited by the inner envelope 34.

La vapeur sortant des tubes 38 du dispositif séparateur 28 poursuit son chemin vers le haut pour se diriger vers le dispositif de séchage 30 dont la description va maintenant être faite plus en détail en se référant à la figure 2.The steam leaving the tubes 38 of the separating device 28 continues its path upwards to go towards the drying device 30, the description of which will now be given in more detail with reference to FIG. 2.

Le dispositif de séchage 30 comprend principalement plusieurs couches horizontales de sécheurs élémentaires 40, les sécheurs élémentaires de chaque couche étant disposés selon un réseau régulier, de préférence à mailles triangulaires ou carrées.The drying device 30 mainly comprises several horizontal layers of elementary dryers 40, the elemental dryers of each layer being arranged in a regular network, preferably with triangular or square meshes.

D'une couche à l'autre, les sécheurs élémentaires sont décalés de telle sorte que les sécheurs d'une couche donnée se trouvent à la verticale du centre des mailles des sécheurs des deux couches immédiatement adjacentes. De plus, les sécheurs élémentaires des couches successives sont emboîtés les uns dans les autres, comme le montre clairement la figure 2.From one layer to another, the elementary dryers are offset so that the dryers of a given layer are vertical to the center of the mesh of the dryers of the two immediately adjacent layers. In addition, the elementary dryers of the successive layers are nested one inside the other, as clearly shown in FIG. 2.

Sur cette figure, on voit également que chacun des sécheurs élémentaires 40 présente approximativement la forme d'un entonnoir d'axe vertical.In this figure, it can also be seen that each of the elementary dryers 40 has approximately the shape of a funnel with a vertical axis.

De façon plus précise, chaque sécheur élémentaire 40 comprend une partie supérieure 40a approximativement tronconique, un bord périphérique extérieur 40b tourné vers le bas et une partie centrale 40c approximativement tubulaire.More specifically, each elementary dryer 40 comprises an upper portion 40a approximately frustoconical, an outer peripheral edge 40b facing downwards and a central portion 40c approximately tubular.

La partie supérieure 40a, très évasée, draine sur sa face supérieure les gouttelettes d'eau vers la partie centrale 40c, qui la borde intérieurement. Au contraire, la face inférieure de la partie 40a, prolongée extérieurement par le bord 40b, oblige le courant de vapeur s'élevant dans le générateur de vapeur à effectuer un changement de direction à 180°.The upper part 40a, very flared, drains on its upper face the water droplets towards the central part 40c, which borders it internally. On the contrary, the lower face of the part 40a, extended externally by the edge 40b, forces the current of steam rising in the steam generator to effect a change of direction at 180 °.

La longueur de la partie centrale tubulaire 40c de chaque séparateur élémentaire 40 est telle que son extrémité inférieure pénètre dans l'extrémité supérieure de la partie correspondante 40c du sécheur élémentaire 40 avec lequel il est aligné verticalement, deux couches plus bas. A cet effet, le diamètre de la partie 40c diminue progressivement vers le bas, de façon à ménager un jeu entre l'extrémité inférieure de la partie 40c d'un sécheur élémentaire donné et l'extrémité supérieure de la partie 40c du sécheur dans lequel pénètre cette extrémité inférieure. Ce jeu permet de drainer les gouttes d'eau collectées par les parties 40c, comme l'illustrent les flèches F₁ sur la figure 2.The length of the central tubular part 40c of each elementary separator 40 is such that its lower end penetrates into the upper end of the corresponding part 40c of the elementary dryer 40 with which it is vertically aligned, two layers below. To this end, the diameter of the part 40c gradually decreases downward, so as to leave a clearance between the lower end of the part. 40c of a given elementary dryer and the upper end of the part 40c of the dryer into which this lower end penetrates. This game makes it possible to drain the drops of water collected by the parts 40c, as illustrated by the arrows F₁ in FIG. 2.

Par ailleurs, le diamètre extérieur de chacun des sécheurs élémentaires 40 et la dimension des mailles selon lesquelles ces sécheurs sont disposés dans chacune des couches sont tels qu'il existe également un certain jeu entre la partie tubulaire 40c de chaque sécheur élémentaire et le bord périphérique extérieur 40b des sécheurs élémentaires de la couche immédiatement inférieure.Furthermore, the outside diameter of each of the elemental dryers 40 and the size of the meshes according to which these dryers are arranged in each of the layers are such that there is also a certain clearance between the tubular part 40c of each elementary dryer and the peripheral edge. outside 40b of the elementary dryers of the immediately lower layer.

En outre, la longueur du bord périphérique extérieur 40b des sécheurs élémentaires est telle qu'il existe également un jeu entre l'extrémité inférieure de ces bords et les parties 40a des sécheurs élémentaires de la couche de sécheurs situés immédiatement en-dessous. En pratique, ce résultat est obtenu en faisant simplement reposer par gravité les sécheurs élémentaires d'une couche donnée sur les sécheurs de la couche inférieure adjacente, grâce au caractère approximativement tronconique des parties 40a.In addition, the length of the outer peripheral edge 40b of the elementary dryers is such that there is also a clearance between the lower end of these edges and the parts 40a of the elementary dryers of the layer of dryers situated immediately below. In practice, this result is obtained by simply resting by gravity the elementary dryers of a given layer on the dryers of the adjacent lower layer, by virtue of the approximately frustoconical character of the parts 40a.

Ces deux dernières caractéristiques assurent l'écoulement ascendant de la vapeur au travers de l'empilement de sécheurs élémentaires 40, comme l'illustrent les flèches F₂ sur la figure 2.These last two characteristics ensure the upward flow of steam through the stack of elementary dryers 40, as illustrated by the arrows F₂ in FIG. 2.

Ainsi, la vapeur d'eau en provenance de l'ensemble séparateur 28 et s'écoulant de bas en haut subit un changement de direction approximativement à 180° à chaque fois qu'elle vient heurter la partie supérieure 40a prolongée par le bord 40b d'un sécheur élémentaire. En effet, la forme légèrement évasée de la partie 40a dévie la vapeur radialement vers l'extérieur par rapport à l'axe vertical du sécheur élémentaire correspondant, vers le bord retourné 40b. Ce dernier oblige alors la vapeur à redescendre avant de reprendre son chemin ascendant jusqu'aux sécheurs élémentaires de la couche supérieure.Thus, the water vapor coming from the separator assembly 28 and flowing from bottom to top undergoes a change of direction approximately 180 ° each time it strikes the upper part 40a extended by the edge 40b d 'an elementary dryer. In fact, the slightly flared shape of the part 40a deflects the vapor radially outwards relative to the vertical axis of the corresponding elementary dryer, towards the inverted edge 40b. The latter then forces the vapor to descend before resuming its upward path to the elemental dryers of the upper layer.

Sous l'effet combiné des forces d'inertie et des forces de pesanteur orientées toutes deux verticalement vers le bas, l'efficacité de la séparation est sensiblement accrue par rapport aux dispositifs de la technique antérieure. L'encombrement vertical du dispositif de séchage 30 et, par conséquent, du générateur de vapeur peut donc être réduit, pour une efficacité donnée, par rapport aux dispositifs utilisés actuellement.Under the combined effect of inertial forces and gravity forces both oriented vertically downwards, the efficiency of separation is significantly increased compared to the devices of the prior art. The vertical size of the drying device 30 and, consequently, of the steam generator can therefore be reduced, for a given efficiency, compared to the devices currently used.

Comme l'illustrent également les flèches F₁ sur la figure 2, les gouttelettes d'eau séparées de la vapeur par chacun des sécheurs élémentaires 40 chutent sur la partie supérieure 40a des sécheurs élémentaires de la couche inférieure adjacente en soustrayant les gouttelettes d'eau séparées à un entraînement de la vapeur. L'eau séparée de la vapeur est ensuite acheminée par les parties centrales tubulaires 40c des sécheurs élémentaires jusqu'à des canaux de drainage 42 s'étendant horizontalement sur toute la largeur du générateur de vapeur (figure 1) et dans lesquels pénètrent les extrémités inférieures des parties tubulaires 40c des sécheurs élémentaires formant les deux couches inférieures de l'empilement.As also illustrated by the arrows F₁ in FIG. 2, the water droplets separated from the vapor by each of the elementary dryers 40 fall on the upper part 40a of the elementary dryers of the adjacent lower layer by subtracting the separated water droplets steam entrainment. The water separated from the steam is then conveyed by the tubular central parts 40c of the elementary dryers to drainage channels 42 extending horizontally over the entire width of the steam generator (FIG. 1) and into which the lower ends penetrate. tubular parts 40c of the elemental dryers forming the two lower layers of the stack.

A leurs extrémités, les canaux de drainage 42 sont équipés de tuyauteries 44 (figure 1) permettant d'acheminer l'eau ainsi drainée jusqu'au-dessus de l'espace annulaire 36 délimité entre les enveloppes 34 et 10. L'eau séparée de la vapeur redescend ainsi jusqu'en partie basse du générateur de vapeur pour être mélangée avec l'eau d'alimentation pénétrant par la tubulure 26.At their ends, the drainage channels 42 are fitted with pipes 44 (FIG. 1) making it possible to convey the water thus drained to above the annular space 36 delimited between the envelopes 34 and 10. The separated water steam thus descends to the lower part of the steam generator to be mixed with the feed water entering through the pipe 26.

De préférence et comme l'illustre la figure 1, le fond de chacun des canaux de drainage 42 est incliné radialement vers l'extérieur de l'échangeur pour faciliter l'écoulement de l'eau jusqu'aux tuyauteries 44 formant les passages de retour de l'eau vers la zone de production de vapeur du générateur.Preferably and as illustrated in FIG. 1, the bottom of each of the drainage channels 42 is inclined radially towards the outside of the exchanger to facilitate the flow of water to the pipes 44 forming the return passages. water to the steam generator area.

En variante et comme l'illustre très schématiquement la figure 3, l'ensemble de séchage 30 peut être constitué de paniers modulaires interchangeable 46 dans chacun desquels est logé un certain nombre de sécheurs élémentaires 40. Pour faciliter leur mise en place, et occuper l'ensemble de la section du générateur de vapeur, les paniers 46 présentent de préférence une forme hexagonale en section horizontale.As a variant and as illustrated very diagrammatically in FIG. 3, the drying assembly 30 can consist of interchangeable modular baskets 46 in each of which is housed a certain number of elementary dryers 40. To facilitate their installation, and occupy the of the generator section the baskets 46 preferably have a hexagonal shape in horizontal section.

Dans cette variante de la figure 3, les canaux de drainage 42 restent montés de façon fixe à l'intérieur de l'enveloppe 10 du générateur.In this variant of FIG. 3, the drainage channels 42 remain fixedly mounted inside the casing 10 of the generator.

En revanche, dans la variante de réalisation représentée sur les figures 4 et 5, chacun des paniers modulaires interchangeables comprend à la fois un empilement de plusieurs couches de sécheurs élémentaires 40, un ensemble de canaux de drainage élémentaires 42 et un tube 38 du dispositif séparateur 28.On the other hand, in the alternative embodiment shown in FIGS. 4 and 5, each of the interchangeable modular baskets comprises both a stack of several layers of elementary dryers 40, a set of elementary drainage channels 42 and a tube 38 of the separator device 28.

De façon plus précise, les sécheurs 40 sont ici encore logés dans un panier 46 présentant une section horizontal hexagonale, ce panier se prolongeant vers le bas de telle sorte que s'y trouvent logés des canaux de drainage 42 de longueur réduite (figure 5), ainsi que l'extrémité supérieure de l'un des tubes 38.More specifically, the dryers 40 are here again housed in a basket 46 having a horizontal hexagonal section, this basket extending downward so that there are housed drainage channels 42 of reduced length (Figure 5) , as well as the upper end of one of the tubes 38.

Comme l'illustre la figure 5, le diamètre du tube 38 est tel qu'il se loge entièrement à l'intérieur de la partie inférieure du panier 46 en délimitant avec celui-ci un espace annulaire 44a dans lequel les extrémités des canaux de drainage 42 débouchent par des trous 42a. Cet espace annulaire 44a constitue alors le passage de retour de l'eau vers la zone de production de vapeur et remplace ainsi les canalisations 44 de la figure 1.As illustrated in FIG. 5, the diameter of the tube 38 is such that it fits entirely inside the lower part of the basket 46, delimiting therewith an annular space 44a in which the ends of the drainage channels 42 open out through holes 42a. This annular space 44a then constitutes the return passage of the water towards the steam production zone and thus replaces the pipes 44 of FIG. 1.

Dans cette variante des figures 4 et 5, chacun des tubes 38 est fixé au panier 46 correspondant, de sorte que l'enlèvement de ce dernier permet d'assurer la maintenance des sécheurs et du séparateur correspondants.In this variant of FIGS. 4 and 5, each of the tubes 38 is fixed to the corresponding basket 46, so that the removal of the latter makes it possible to maintain the dryers and the corresponding separator.

La forme particulière des sécheurs élémentaires 40 décrite précédemment ne doit pas être considérée comme limitative, la seule double condition que doivent remplir ces sécheurs étant d'assurer un retournement à environ 180° de l'écoulement de vapeur ascendant ainsi qu'un retour de l'eau séparée de la vapeur dans les canaux de drainage 42. En particulier, la partie supérieure 40a des sécheurs élémentaires peut présenter une section en arc de cercle permettant de relier la partie tubulaire 40c au bord périphérique 40b.The particular shape of the elementary dryers 40 described above should not be considered as limiting, the only double condition that must meet these dryers being to ensure a return to about 180 ° of the ascending steam flow as well as a return of the water separated from the steam in the drainage channels 42. In particular, the upper part 40a of the elementary dryers can have a circular arc section allowing the tubular part 40c to be connected to the peripheral edge 40b.

Claims (4)

1. Steam generator, which comprises an outer casing (10) containing, starting from the bottom, a zone (12) for the production of wet steam, means (28) for separat­ing some of the water and means (30) for drying the steam, and in which:
- the means (30) for drying the steam comprise a plurality of superposed horizontal layers of elementary dryers (40) arranged according to a regular network of given aperture size, this network being identical and offset from one layer to another, so that the elementary dryers of each of the layers are arranged vertically in line with the centre of the apertures of the adjacent layers, each elementary dryer (40) having an upper part widened from the bottom upwards and extended internally downwards by a central part;
- a clearance is provided between the central part of each elementary dryer (40) and the edge of the upper part of the elementary dryers of the layer im­mediately be low;
- the drying means (30) comprise, furthermore, water drainage channels (42) located under the layers of dryers (40) and opening into water return passages descending towards the steam production zone;
characterized in that each elementary dryer has approxim­ately the form of a funnel of vertical axis, comprising a substantially frustoconical upper part (40a) delimited externally by an outer peripheral edge (40b) turned downwards and extended internally downwards by a central tubular part (40c), the central tubular parts (40c) of the elementary dryers of the two lowest layers all penetrating into one of the drainage channels (42); and in that the elementary dryers (40) of the successive layers are nested one in the other, in such a way that the lower end of the central part of each elementary dryer enters the upper end of the corresponding part of the elementary dryer with which it is aligned, two layers lower down.
2. Steam generator according to Claim 1, charac­terized in that the drying means (30) comprise juxtaposed interchangeable baskets (46), each containing a plurality of layers of elementary dryers (40).
3. Steam generator according to Claim 2, charac­terized in that the interchangeable baskets (46) have a hexagonal horizontal cross-section.
4. Steam generator according to Claim 3, charac­terized in that, with the separating means comprising helical vanes (29) arranged in vertical tubes (38), the interchangeable baskets (46) likewise contain elementary drainage channels (42) and are extended downwards so as to surround and support the upper end of one of the tubes (38), delimiting with the latter an annular water-return space (44a), into which open the elementary drainage channels (42).
EP19870401361 1986-06-18 1987-06-17 Steam generator with improved drying means Expired - Lifetime EP0250319B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8608804 1986-06-18
FR8608804A FR2600403B1 (en) 1986-06-18 1986-06-18 STEAM GENERATOR WITH IMPROVED DRYING MEANS

Publications (2)

Publication Number Publication Date
EP0250319A1 EP0250319A1 (en) 1987-12-23
EP0250319B1 true EP0250319B1 (en) 1991-02-20

Family

ID=9336456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870401361 Expired - Lifetime EP0250319B1 (en) 1986-06-18 1987-06-17 Steam generator with improved drying means

Country Status (3)

Country Link
EP (1) EP0250319B1 (en)
DE (1) DE3768054D1 (en)
FR (1) FR2600403B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112054416B (en) * 2020-09-03 2022-03-01 福建腾力电力发展有限公司 Positive pressure space switch cabinet

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2004498A1 (en) * 1970-01-31 1971-08-05 Licentia Gmbh Separator
FR2507742A1 (en) * 1981-06-16 1982-12-17 Commissariat Energie Atomique STEAM GENERATOR HAVING A DYNAMIC PURGE DEVICE

Also Published As

Publication number Publication date
DE3768054D1 (en) 1991-03-28
FR2600403A1 (en) 1987-12-24
FR2600403B1 (en) 1988-08-26
EP0250319A1 (en) 1987-12-23

Similar Documents

Publication Publication Date Title
EP0067739B1 (en) Method and apparatus for removing sludge from the top surface of the tube sheet of a steam generator
EP0246151B1 (en) Separator with winged fins for the separation of liquid particles
EP0068913B1 (en) Fast breeder reactor with a residual heat dissipation system
EP0176420B1 (en) Apparatus for separating water and vapour for drying a humid vapour
EP0250319B1 (en) Steam generator with improved drying means
EP0389361B1 (en) Preheated steam generator
FR2616883A1 (en) STEAM GENERATOR WATER PURIFYING BIN
EP0634607B1 (en) Steam generator with removable cyclone separators
CH628969A5 (en) STEAM GENERATOR COMPRISING A DEVICE FOR DISCHARGING CONTAMINANTS FROM THE STEAM GENERATOR FLUID.
EP0043760B1 (en) Steam drying system for steam generators, particularly for nuclear steam generators
EP0607071B1 (en) Heat exchanger with secondary fluid fed at the top through an overflow
EP0038748B1 (en) Vapour-water separator at the outlet of a steam generator evaporator space
EP0032088B1 (en) Apparatus for the separation of the liquid and vapour phase of a fluid and steam generator comprising such apparatuses
EP0005225B1 (en) Apparatus for extracting moisture from and for reheating steam
EP0566477B1 (en) Steam generator with a system for water deflexion and for removing sludge
CA1111789A (en) Vertical steam/liquid mix separator
EP0568434B1 (en) Distributing and partitioning device for feed and recirculation water in the secondary side of a steam generator
FR2597577A1 (en) HEAT EXCHANGER FOR STEAM GENERATOR, ESPECIALLY NUCLEAR POWER PLANT
FR2593718A1 (en) Falling film evaporator
CH384590A (en) Vertical steam generator
FR2541441A1 (en) DEVICE FOR DEGASSING CONDENSATES INSTALLED IN A WELL OF ELECTRICAL POWER UNIT CONDENSER
EP0557173A1 (en) Steam generator with inlet of feed water in the lower part
BE521733A (en)
BE334250A (en)
BE592021A (en)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE CH DE GB IT LI NL

17P Request for examination filed

Effective date: 19880530

17Q First examination report despatched

Effective date: 19900115

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE GB IT LI NL

REF Corresponds to:

Ref document number: 3768054

Country of ref document: DE

Date of ref document: 19910328

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920526

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920609

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19920618

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19920630

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19920702

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930617

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19930630

Ref country code: CH

Effective date: 19930630

Ref country code: BE

Effective date: 19930630

BERE Be: lapsed

Owner name: COMMISSARIAT A L'ENERGIE ATOMIQUE ETABLISSEMENT D

Effective date: 19930630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19940101

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930617

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050617