EP0353154B1 - Apparatus for removing spent pellets from tube bundle cleaning installations - Google Patents

Apparatus for removing spent pellets from tube bundle cleaning installations Download PDF

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Publication number
EP0353154B1
EP0353154B1 EP89402129A EP89402129A EP0353154B1 EP 0353154 B1 EP0353154 B1 EP 0353154B1 EP 89402129 A EP89402129 A EP 89402129A EP 89402129 A EP89402129 A EP 89402129A EP 0353154 B1 EP0353154 B1 EP 0353154B1
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EP
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Prior art keywords
balls
rails
separator member
pipe
pipe system
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EP89402129A
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German (de)
French (fr)
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EP0353154A1 (en
Inventor
André Bizard
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Technos et Cie
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Technos et Cie
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/12—Fluid-propelled scrapers, bullets, or like solid bodies

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • a device is known from DE-A-31 25 503.
  • Such devices are used in installations for cleaning bundles of tubes such as those equipping the condensers of large steam turbines, the heat exchangers of nuclear reactors, installations implementing forced circulation in these tubes of balls of elastic material whose diameter is slightly greater than the diameter of the tubes, said circulation being imposed by the liquid brought to circulate in through said tubes, liquid for example constituted by water drawn from a river.
  • a circuit for recycling balls essentially comprising a grid extending across the outlet pipe of said bundle so as to recover the balls leaving this bundle, and a recycling tubing suitable for receiving a stream of the above liquid charged with the balls thus recovered and for reinjecting this stream into the inlet pipe of the bundle of tubes, tubing successively passing through a drive pump and a ball collector, said collector being in particular constituted by an isolable and openable receptacle.
  • the sieve was then a sheet perforated by circular openings having a diameter substantially equal to that of the used balls to be eliminated and therefore less than that of healthy balls (see FR-A-2 468 868 and DE-A-31 25 503).
  • the object of the invention is, above all, to remedy this drawback.
  • the devices for eliminating used balls according to the invention also comprise a static separator member for used balls mounted on the recycling pipe, a bypass pipe connected to this separator member so as to collect the separated used balls and a basket for collecting these balls connected to the bypass line, and they are essentially characterized in that the separating member forms a section of the recycling pipe, in that the openings for separating the worn balls included in this separating member are delimited by the ridges of parallel rails extending parallel to the flow of liquid in said tube and together forming the bars of a sort of grid, the difference between these ridges being slightly less than the diameter of the worn balls to be eliminated, the ends downstream of said rails being terminated by recesses suitable for automatically detaching from the rails the balls introduced partially between these rails without being able to pass between them and driven by sliding along said rails, and an annular chamber connected to the bypass pipe being provided around the downstream ends of said rails rails.
  • FIG. 1, of this drawing schematically shows a bundle of tubes and an installation intended to clean this bundle using balls of elastic material, installation equipped with a device according to the invention for the elimination of used balls .
  • Figures 2 and 3 show respectively in axial section and in partial cross section along III-III, Figure 2, the separating member included by this elimination device.
  • the bundle of tubes 1 to be cleaned is intended to be traversed by a liquid such as water from a river and this liquid is brought to said bundle by an intake pipe 2 and discharged out of the beam by an exhaust pipe 3.
  • the tubes are cleaned using balls 4 of elastic material which are entrained by the liquid and which originally have a diameter slightly greater than the inside diameter of the tubes 1.
  • the discharge pipe 3 is equipped with a grid 5 intended to collect the balls 4 leaving the tubes 1 and to recycle these balls by reinjecting them into the intake pipe 2 via a recycling pipe 6.
  • This tubing successively passes through a drive pump 7 and a ball collector 8.
  • This collector 8 contains a basket 9 permeable to liquid but capable of retaining the balls.
  • the collector can then be opened by a cover 12 so as to allow the removal of the balls collected in the basket 9.
  • this basket 9 At the base of this basket 9 is a valve 13 allowing either to retain therein all of the balls which reach the collector 8, or to leave escape these balls towards the downstream end 14 of the tubing 6 so as to reinject them into the intake pipe 2.
  • the invention proposes to automatically separate and evacuate from the installation the balls which have become ineffective due to their wear, resulting in a reduction in diameter.
  • this diameter must remain slightly greater than the inside diameter of the tubes 1 to be cleaned, otherwise the balls pass through these tubes without scraping their internal surfaces.
  • a member 15 for separating used balls which member is itself connected by a line 16 to a collection basket and elimination 17 permeable to liquid, but not passable by the balls, and disposed inside the collector 8.
  • the separator 15 is itself formed of static components which cannot be blocked by the balls, namely by rails 18 parallel to each other and parallel to the current of the liquid circulating in the tube 6.
  • the separation meshes are delimited by the ridges 19 of these parallel rails 18, ridges which are spaced apart from each other by a distance d (FIG. 3) slightly less than the diameter of the worn balls to be eliminated: this distance d is for example equal to 18 mm if the diameter of the worn balls to be removed is between 22 and 24 mm.
  • the balls partially introduced between the rails, but too large to pass between them, slide along these rails and are automatically detached from the rails arriving at the recesses 20, which are preferably connected to the ridges 19 of the corresponding rails by a sharp angle, preferably straight.
  • the rails 18 are advantageously constituted by flat fins extending radially in a crown, from a cylindrical housing of revolution 21, towards the axis of this housing.
  • this cage can be smaller than that of the two sections of tubing 6 which extend it, said cage then being connected to the upstream section by a frustoconical surface 22 and to the downstream section by the recesses 20 described above.
  • said inside diameter of the cage is equal to that of the sections of tubing 6 which extend this cage, the frustoconical inlet area 22 then being removed and carried over to the outlet of the separator, so as to guide towards the downstream section of tubing 6 the contents of the ring, of enlarged diameter, which is axially contiguous to the terminal sections downstream of the rails 18.
  • the construction proposed above for the rails 18 has the advantage of offering an enlarged space 23 (FIG. 3) for each worn ball as soon as it has crossed the mesh delimited by two contiguous ridges 19: in this way, these balls are immediately evacuated to line 16 as soon as they have crossed the mesh in question.
  • the first is enlarged by cutting at a bevel at 26 the external downstream ends of the fins constituting the rails 18.
  • the basket 17 is equipped with a cover 27 itself removably mounted on the cover 12 of the collector 8, which makes it possible to replace said basket 17 and to evacuate its contents without it being necessary to open the cover 12, but of course after closing the two valves 10 and 11.
  • a removable diaphragm 28 is advantageously mounted on the downstream end of the pipe 16, the end which is connected to the basket 17.
  • this maximum value can be adjusted between 22 and 24 mm for a given elasticity of the balls, if the opening d of the separation meshes has the value of 18 mm indicated above. .
  • said balls whose diameter is reduced, but which can still be used for cleaning, can partially penetrate between two contiguous rails, but they then slide along these rails due to the entrainment of the liquid and they are released in the recycling circuit arriving at the downstream ends of these rails, thanks to the recesses 20.
  • Some of the balls considered to be worn that is to say whose diameter is less than or equal to the length d or only slightly greater than this length d , pass through the meshes defined by the crests 19 of the rails 18, at the price possibly d 'a slight elastic compression, and are immediately routed through the pipe 16 to the basket 17.
  • this basket When the basket 17 is sufficiently filled with worn balls, which can be determined automatically, in particular by counting the balls remaining in the installation using the member 29, this basket can be released through the cover 27 after closing provisional of the two valves 10 and 11.
  • a new load of fresh balls is then introduced through the nozzle 31, after release of the plug 30, in order to compensate for the balls eliminated.
  • a ball counter could be mounted directly on the pipe 16.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cleaning In General (AREA)

Description

L'invention concerne un dispositif selon la préamblule de la revendication 1. Un tel dispositif est connu par le DE-A-31 25 503. De tels dispositifs sont utilisés dans les installations de nettoyage de faisceaux de tubes tels que ceux équipant les condenseurs des grosses turbines à vapeur, les échangeurs de chaleur des réacteurs nucléaires, installations mettant en oeuvre la circulation forcée dans ces tubes de boules en matériau élastique dont le diamètre est légèrement supérieur au diamètre des tubes, ladite circulation étant imposée par le liquide amené à circuler à travers lesdits tubes, liquide par exemple constitué par l'eau puisée dans une rivière.The invention relates to a device according to the preamble of claim 1. Such a device is known from DE-A-31 25 503. Such devices are used in installations for cleaning bundles of tubes such as those equipping the condensers of large steam turbines, the heat exchangers of nuclear reactors, installations implementing forced circulation in these tubes of balls of elastic material whose diameter is slightly greater than the diameter of the tubes, said circulation being imposed by the liquid brought to circulate in through said tubes, liquid for example constituted by water drawn from a river.

Elle concerne plus particulièrement, parmi lesdites installations, celles qui comprennent entre la sortie et l'entrée du faisceau de tubes un circuit de recyclage des boules comportant essentiellement une grille s'étendant en travers de la conduite de sortie dudit faisceau de façon à récupérer les boules sortant de ce faisceau, et une tubulure de recyclage propre à recevoir un courant du liquide ci-dessus chargé des boules ainsi récupérées et à réinjecter ce courant dans la conduite d'entrée du faisceau de tubes, tubulure traversant successivement une pompe d'entraînement et un collecteur de boules, ledit collecteur étant notamment constitué par un réceptacle isolable et ouvrable.It relates more particularly, among said installations, those which comprise, between the outlet and the inlet of the bundle of tubes, a circuit for recycling balls, essentially comprising a grid extending across the outlet pipe of said bundle so as to recover the balls leaving this bundle, and a recycling tubing suitable for receiving a stream of the above liquid charged with the balls thus recovered and for reinjecting this stream into the inlet pipe of the bundle of tubes, tubing successively passing through a drive pump and a ball collector, said collector being in particular constituted by an isolable and openable receptacle.

Pour évacuer hors de telles installations les boules usées, c'est-à-dire dont le diamètre est devenu insuffisant pour assurer un nettoyage efficace des tubes, il a été proposé de faire comprendre à ces installations une chambre de séparation ou triage délimitée par un tamis, disposée à l'intérieur du collecteur de boules et raccordée à un point, de la tubulure de recyclage, situé en aval de ce collecteur, la conduite qui relie ladite chambre audit point traversant un panier de ramassage et d'élimination des boules usées recueillies dans la chambre.In order to evacuate used balls, that is to say the diameter of which has become insufficient to ensure effective cleaning of the tubes, out of such installations, it has been proposed to make these installations understand a separation or sorting chamber delimited by a screen, placed inside the ball collector and connected to a point on the recycling tube, located downstream of this collector, the pipe which connects said chamber to said point passing through a basket of collection and disposal of used balls collected in the room.

Le tamis était alors une tôle perforée par des ouvertures circulaires ayant un diamètre sensiblement égal à celui des boules usées à éliminer et donc inférieur à celui des boules saines (voir FR-A-2 468 868 et DE-A-31 25 503).The sieve was then a sheet perforated by circular openings having a diameter substantially equal to that of the used balls to be eliminated and therefore less than that of healthy balls (see FR-A-2 468 868 and DE-A-31 25 503).

Vu la nature élastique du matériau constitutif des boules, celles ayant un diamètre légèrement supérieur à celui des boules usées à éliminer avaient tendance à pénétrer en partie dans les ouvertures du tamis et à se coincer dans ces ouvertures, au risque de colmater rapidement le tamis et de le rendre ainsi inopérant.Given the elastic nature of the material of the balls, those having a diameter slightly greater than that of the worn balls to be eliminated tended to penetrate partly into the openings of the sieve and to get caught in these openings, at the risk of rapidly clogging the sieve and thus rendering it inoperative.

On a essayé de remédier à ce grave inconvénient en créant une turbulence dans le liquide porteur des boules juste en amont du tamis. Mais, dans la pratique, on n'est pas parvenu à surmonter véritablement l'inconvénient signalé.We have tried to remedy this serious drawback by creating turbulence in the liquid carrying the balls just upstream of the sieve. In practice, however, the reported drawback has not been fully overcome.

L'invention a pour but, surtout, de remédier à cet inconvénient.The object of the invention is, above all, to remedy this drawback.

A cet effet, les dispositifs d'élimination des boules usées selon l'invention comprennent encore un organe séparateur statique de boules usées monté sur la tubulure de recyclage, une conduite de dérivation raccordée à cet organe séparateur de façon à recueillir les boules usées séparées et un panier de ramassage de ces boules raccordé à la conduite de dérivation, et ils sont essentiellement caractérisés en ce que l'organe séparateur forme un tronçon de la tubulure de recyclage, en ce que les ouvertures de séparation des boules usées comprises par cet organe séparateur sont délimitées par les crêtes de rails parallèles s'étendant parallèlement au courant de liquide dans ladite tubulure et formant ensemble les barreaux d'une sorte de grille, l'écart entre ces crêtes étant légèrement inférieur au diamètre des boules usées à éliminer, les extrémités aval desdits rails étant terminées par des décrochements propres à décrocher automatiquement des rails les boules introduites partiellement entre ces rails sans pouvoir passer entre eux et entraînées par glissement le long desdits rails, et une chambre annulaire raccordée à la conduite de dérivation étant prévue autour des extrémités aval desdits rails.To this end, the devices for eliminating used balls according to the invention also comprise a static separator member for used balls mounted on the recycling pipe, a bypass pipe connected to this separator member so as to collect the separated used balls and a basket for collecting these balls connected to the bypass line, and they are essentially characterized in that the separating member forms a section of the recycling pipe, in that the openings for separating the worn balls included in this separating member are delimited by the ridges of parallel rails extending parallel to the flow of liquid in said tube and together forming the bars of a sort of grid, the difference between these ridges being slightly less than the diameter of the worn balls to be eliminated, the ends downstream of said rails being terminated by recesses suitable for automatically detaching from the rails the balls introduced partially between these rails without being able to pass between them and driven by sliding along said rails, and an annular chamber connected to the bypass pipe being provided around the downstream ends of said rails rails.

Dans des modes de réalisation préférés, on a recours en outre à l'une et/ou à l'autre des dispositions suivantes :

  • les rails constitutifs de l'organe séparateur sont rectilignes,
  • les crêtes des rails selon l'alinéa précédent forment les barreaux longitudinaux d'une case cylindrique de révolution coaxiale aux tronçons, de la tubulure de recyclage, entre lesquels est branché ledit organe séparateur,
  • le diamètre intérieur de la cage selon l'alinéa précédent est un peu inférieur à celui des tronçons de tubulure entre lesquels est branché l'organe séparateur,
  • le diamètre intérieur de la cage ci-dessus est égal à celui des tronçons de tubulure entre lesquels est branché l'organe séparateur,
  • les rails parallèles sont constitués par des plaquettes d'épaisseur constante s'étendant radialement selon une couronne à partir d'un boîtier cylindrique de révolution, vers l'axe de ce boîtier,
  • le branchement de l'organe séparateur sur la tubulure de recyclage est effectué en amont du collecteur de boules et le panier de ramassage des boules usées est raccordé à l'extrémité aval de la conduite de dérivation et disposé à l'intérieur du collecteur de boules,
  • un diaphragme amovible est monté sur la conduite de dérivation, notamment à son extrémité aval.
In preferred embodiments, use is also made of one and / or the other of the following arrangements:
  • the constituent rails of the separating member are rectilinear,
  • the crests of the rails according to the preceding paragraph form the longitudinal bars of a cylindrical box of revolution coaxial with the sections, of the recycling pipe, between which said separating member is connected,
  • the inside diameter of the cage according to the preceding paragraph is slightly less than that of the sections of tubing between which the separating member is connected,
  • the inside diameter of the above cage is equal to that of the sections of tubing between which the separating member is connected,
  • the parallel rails consist of plates of constant thickness extending radially in a ring from a cylindrical housing of revolution, towards the axis of this housing,
  • the connection of the separating member to the recycling tubing is carried out upstream of the ball collector and the basket for collecting used balls is connected to the downstream end of the bypass line and placed inside the ball collector ,
  • a removable diaphragm is mounted on the bypass pipe, in particular at its downstream end.

Dans ce qui suit, l'on va décrire un mode de réalisation préféré de l'invention en se référant au dessin ci-annexé d'une manière bien entendu non limitative.In what follows, a preferred embodiment of the invention will be described with reference to the attached drawing, of course in a non-limiting manner.

La figure 1, de ce dessin, montre schématiquement un faisceau de tubes et une installation destinée à nettoyer ce faisceau à l'aide de boules en matériau élastique, installation équipée d'un dispositif conforme à l'invention pour l'élimination des boules usées.FIG. 1, of this drawing, schematically shows a bundle of tubes and an installation intended to clean this bundle using balls of elastic material, installation equipped with a device according to the invention for the elimination of used balls .

Les figures 2 et 3 montrent respectivement en coupe axiale et en coupe transversale partielle selon III-III, figure 2, l'organe séparateur compris par ce dispositif d'élimination.Figures 2 and 3 show respectively in axial section and in partial cross section along III-III, Figure 2, the separating member included by this elimination device.

D'une façon connue en elle-même, le faisceau de tubes 1 à nettoyer est destiné à être parcouru par un liquide tel que l'eau d'une rivière et ce liquide est amené audit faisceau par une conduite d'admission 2 et évacué hors du faisceau par une conduite d'évacuation 3.In a manner known in itself, the bundle of tubes 1 to be cleaned is intended to be traversed by a liquid such as water from a river and this liquid is brought to said bundle by an intake pipe 2 and discharged out of the beam by an exhaust pipe 3.

Le nettoyage des tubes est effectué à l'aide de boules 4 en matériau élastique qui sont entraînées par le liquide et qui présentent à l'origine un diamètre légèrement supérieur au diamètre intérieur des tubes 1.The tubes are cleaned using balls 4 of elastic material which are entrained by the liquid and which originally have a diameter slightly greater than the inside diameter of the tubes 1.

La conduite d'évacuation 3 est équipée d'une grille 5 destinée à récupérer les boules 4 sortant des tubes 1 et à recycler ces boules en les réinjectant dans la conduite d'admission 2 par l'intermédiaire d'une tubulure de recyclage 6.The discharge pipe 3 is equipped with a grid 5 intended to collect the balls 4 leaving the tubes 1 and to recycle these balls by reinjecting them into the intake pipe 2 via a recycling pipe 6.

Cette tubulure traverse successivement une pompe d'entraînement 7 et un collecteur de boules 8.This tubing successively passes through a drive pump 7 and a ball collector 8.

Ce collecteur 8 contient un panier 9 perméable au liquide mais susceptible de retenir les boules.This collector 8 contains a basket 9 permeable to liquid but capable of retaining the balls.

Deux vannes respectivement amont 10 et aval 11 montées sur la tubulure 6 permettent d'isoler le collecteur 8 du reste de cette tubulure.Two respectively upstream 10 and downstream 11 valves mounted on the pipe 6 make it possible to isolate the manifold 8 from the rest of this pipe.

Le collecteur peut alors être ouvert par un couvercle 12 de façon à permettre l'enlèvement des boules récoltées dans le panier 9.The collector can then be opened by a cover 12 so as to allow the removal of the balls collected in the basket 9.

A la base de ce panier 9 se trouve une vanne 13 permettant soit de retenir dans celui-ci l'ensemble des boules qui parviennent au collecteur 8, soit de laisser échapper ces boules vers l'extrémité aval 14 de la tubulure 6 de façon à les réinjecter dans la conduite d'admission 2.At the base of this basket 9 is a valve 13 allowing either to retain therein all of the balls which reach the collector 8, or to leave escape these balls towards the downstream end 14 of the tubing 6 so as to reinject them into the intake pipe 2.

Comme exposé plus haut, l'invention se propose de séparer automatiquement et d'évacuer de l'installation les boules qui sont devenues inefficaces du fait de leur usure, se traduisant par une réduction de diamètre.As explained above, the invention proposes to automatically separate and evacuate from the installation the balls which have become ineffective due to their wear, resulting in a reduction in diameter.

En effet, ce diamètre doit demeurer légèrement supérieur au diamètre intérieur des tubes 1 à nettoyer, faute de quoi les boules traversent ces tubes sans râcler leurs surfaces internes.Indeed, this diameter must remain slightly greater than the inside diameter of the tubes 1 to be cleaned, otherwise the balls pass through these tubes without scraping their internal surfaces.

A cet effet, on monte sur la tubulure de recyclage 6, entre la vanne amont 10 et le collecteur de boules 8, un organe séparateur 15 de boules usées, organe qui est lui-même raccordé par une conduite 16 à un panier de ramassage et d'élimination 17 perméable au liquide, mais non traversable par les boules, et disposé à l'intérieur du collecteur 8.To this end, there is mounted on the recycling tubing 6, between the upstream valve 10 and the ball collector 8, a member 15 for separating used balls, which member is itself connected by a line 16 to a collection basket and elimination 17 permeable to liquid, but not passable by the balls, and disposed inside the collector 8.

Le séparateur 15 est lui-même formé de composants statiques non colmatables par les boules, savoir par des rails 18 parallèles entre eux et parallèles au courant du liquide en circulation dans la tubulure 6.The separator 15 is itself formed of static components which cannot be blocked by the balls, namely by rails 18 parallel to each other and parallel to the current of the liquid circulating in the tube 6.

Les mailles de séparation sont délimitées par les crêtes 19 de ces rails parallèles 18, crêtes qui sont écartées mutuellement les unes des autres d'une distance d (figure 3) légèrement inférieure au diamètre des boules usées à éliminer : cette distance d est par exemple égale à 18 mm si le diamètre des boules usées à éliminer est compris entre 22 et 24 mm.The separation meshes are delimited by the ridges 19 of these parallel rails 18, ridges which are spaced apart from each other by a distance d (FIG. 3) slightly less than the diameter of the worn balls to be eliminated: this distance d is for example equal to 18 mm if the diameter of the worn balls to be removed is between 22 and 24 mm.

Pour empêcher tout colmatage desdites mailles par les boules un peu trop grosses qui pénètrent partiellement entre les rails sans pouvoir passer entre eux, et qui glissent alors le long des crêtes 19 de ces rails sous l'impulsion du liquide, on prévoit à l'extrémité aval de chaque rail 18 un décrochement radial visible en 20 sur la figure 2.To prevent any clogging of said meshes by the slightly too large balls which partially penetrate between the rails without being able to pass between them, and which then slide along the ridges 19 of these rails under the impulse of the liquid, provision is made at the end downstream of each rail 18, a radial offset visible at 20 in FIG. 2.

Les boules partiellement introduites entre les rails, mais trop grosses pour passer entre ceux-ci, glissent le long de ces rails et sont automatiquement décrochées des rails en parvenant au niveau des décrochements 20, lesquels sont de préférence raccordés aux crêtes 19 des rails correspondants par un angle vif, de préférence droit.The balls partially introduced between the rails, but too large to pass between them, slide along these rails and are automatically detached from the rails arriving at the recesses 20, which are preferably connected to the ridges 19 of the corresponding rails by a sharp angle, preferably straight.

Les rails 18 sont avantageusement constitués par des ailettes plates s'étendant radialement en couronne, à partir d'un boîtier cylindrique de révolution 21, vers l'axe de ce boîtier.The rails 18 are advantageously constituted by flat fins extending radially in a crown, from a cylindrical housing of revolution 21, towards the axis of this housing.

Les crêtes 19 de ces rails s'étendent alors selon les barreaux longitudinaux d'une sorte de cage cylindrique coaxiale au tronçon de tubulure 6 sur lequel il est branché.The crests 19 of these rails then extend along the longitudinal bars of a sort of cylindrical cage coaxial with the section of tubing 6 to which it is connected.

Comme visible sur la figure 2, le diamètre intérieur de cette cage peut être plus petit que celui des deux tronçons de tubulure 6 qui la prolongent, ladite cage étant alors raccordée au tronçon amont par une plage tronconique 22 et au tronçon aval par les décrochements 20 ci-dessus décrits.As can be seen in FIG. 2, the internal diameter of this cage can be smaller than that of the two sections of tubing 6 which extend it, said cage then being connected to the upstream section by a frustoconical surface 22 and to the downstream section by the recesses 20 described above.

Selon une variante également intéressante, ledit diamètre intérieur de la cage est égal à celui des tronçons de tubulure 6 qui prolongent cette cage, la plage tronconique d'entrée 22 étant alors supprimée et reportée à la sortie du séparateur, de façon à guider vers le tronçon aval de tubulure 6 le contenu de l'anneau, de diamètre agrandi, qui est axialement contigu aux tranches terminales aval des rails 18.According to an equally advantageous variant, said inside diameter of the cage is equal to that of the sections of tubing 6 which extend this cage, the frustoconical inlet area 22 then being removed and carried over to the outlet of the separator, so as to guide towards the downstream section of tubing 6 the contents of the ring, of enlarged diameter, which is axially contiguous to the terminal sections downstream of the rails 18.

La construction proposée ci-dessus pour les rails 18 présente l'avantage d'offrir un espace élargi 23 (figure 3) à chaque boule usée dès que celle-ci a franchi la maille délimitée par deux crêtes 19 contiguës : de la sorte, ces boules sont immédiatement évacuées vers la conduite 16 dès qu'elles ont franchi la maille en question.The construction proposed above for the rails 18 has the advantage of offering an enlarged space 23 (FIG. 3) for each worn ball as soon as it has crossed the mesh delimited by two contiguous ridges 19: in this way, these balls are immediately evacuated to line 16 as soon as they have crossed the mesh in question.

Le raccordement entre les mailles et la conduite 16 se fait à travers successivement :

  • une ouverture annulaire 24 prévue à l'extrémité axiale aval du boîtier 21, autour des extrémités aval des rails 18, la direction "aval" étant définie par rapport au sens de circulation du liquide désigné par la flèche F,
  • et une chambre annulaire 25 entourant le boîtier 21 et l'ouverture 24.
The connection between the meshes and the pipe 16 is made successively through:
  • an annular opening 24 provided at the downstream axial end of the housing 21, around the downstream ends of the rails 18, the "downstream" direction being defined relative to the direction of circulation of the liquid designated by the arrow F,
  • and an annular chamber 25 surrounding the housing 21 and the opening 24.

Pour améliorer la circulation circonférentielle des boules dans les espaces 24 et 25, on agrandit le premier en découpant en biseau en 26 les extrémités aval externes des ailettes constitutives des rails 18.To improve the circumferential circulation of the balls in the spaces 24 and 25, the first is enlarged by cutting at a bevel at 26 the external downstream ends of the fins constituting the rails 18.

Le panier 17 est équipé d'un couvercle 27 lui-même monté de façon amovible sur le couvercle 12 du collecteur 8, ce qui permet de remplacer ledit panier 17 et d'évacuer son contenu sans qu'il soit nécessaire d'ouvrir le couvercle 12, mais bien entendu après fermeture des deux vannes 10 et 11.The basket 17 is equipped with a cover 27 itself removably mounted on the cover 12 of the collector 8, which makes it possible to replace said basket 17 and to evacuate its contents without it being necessary to open the cover 12, but of course after closing the two valves 10 and 11.

Sur l'extrémité aval de la conduite 16, extrémité qui est raccordée au panier 17, on monte avantageusement un diaphragme amovible 28.A removable diaphragm 28 is advantageously mounted on the downstream end of the pipe 16, the end which is connected to the basket 17.

Le choix de ce diaphragme permet de régler à volonté la dépression relative qui règne dans la conduite 16 et donc la force d'aspiration hydraulique exercée à partir de cette conduite 16 sur le liquide et les boules traversant le séparateur 15.The choice of this diaphragm makes it possible to adjust at will the relative depression which prevails in the pipe 16 and therefore the hydraulic suction force exerted from this pipe 16 on the liquid and the balls passing through the separator 15.

Ce réglage permet de modifier très facilement la valeur maximum du diamètre des boules élastiques usées qui sont triées par le séparateur 15.This setting makes it very easy to modify the maximum value of the diameter of the worn elastic balls which are sorted by the separator 15.

C'est ainsi que, par simple changement du diaphragme 28, cette valeur maximum peut être réglée entre 22 et 24 mm pour une élasticité donnée des boules, si l'ouverture d des mailles de séparation a la valeur de 18 mm indiquée ci-dessus.Thus, by simply changing the diaphragm 28, this maximum value can be adjusted between 22 and 24 mm for a given elasticity of the balls, if the opening d of the separation meshes has the value of 18 mm indicated above. .

Bien entendu, toutes choses égales par ailleurs, ladite valeur maximum serait inférieure à celles de l'exemple numérique ci-dessus si l'élasticité des boules était inférieure à celle retenue pour cet exemple et vice-versa.Of course, all other things being equal, said maximum value would be lower than those of the numerical example above if the elasticity of the balls was lower than that retained for this example and vice versa.

On voit en outre sur la figure 1 :

  • un dispositif compteur de boules 29 monté sur la tubulure 6, entre le séparateur 15 et le collecteur 8,
  • et un bouchon 30 obturant de façon amovible un embout tubulaire 31 prévu sur le couvercle 12 et permettant de recharger l'installation en boules fraîches.
We also see in Figure 1:
  • a ball counter device 29 mounted on the pipe 6, between the separator 15 and the collector 8,
  • and a plug 30 removably sealing a tubular end piece 31 provided on the cover 12 and making it possible to reload the installation with fresh balls.

Le fonctionnement du dispositif de séparation de boules usées décrit ci-dessus est le suivant.The operation of the used ball separation device described above is as follows.

Lorsque l'installation de nettoyage des tubes 1 est en service normal, avec recyclage des boules 4, toutes ces boules sont admises dans le séparateur 15 lors de chaque cycle.When the tube cleaning installation 1 is in normal service, with recycling of the balls 4, all these balls are admitted into the separator 15 during each cycle.

Toutes celles, de ces boules, qui sont encore efficaces pour le nettoyage, c'est-à-dire qui présentent un diamètre nettement supérieur à la longueur d, traversent axialement le séparateur 15 de part en part.All of these balls, which are still effective for cleaning, that is to say which have a diameter significantly greater than the length d , pass axially through the separator 15 right through.

Certaines de celles, desdites boules, dont le diamètre est réduit, mais qui peuvent encore servir au nettoyage, peuvent pénétrer partiellement entre deux rails contigus, mais elles glissent alors le long de ces rails du fait de l'entraînement du liquide et elles sont relâchées dans le circuit de recyclage en parvenant aux extrémités aval de ces rails, grâce aux décrochements 20.Some of those, said balls, whose diameter is reduced, but which can still be used for cleaning, can partially penetrate between two contiguous rails, but they then slide along these rails due to the entrainment of the liquid and they are released in the recycling circuit arriving at the downstream ends of these rails, thanks to the recesses 20.

Certaines des boules considérées comme usées, c'est-à-dire dont le diamètre est inférieur ou égal à la longueur d ou seulement légèrement supérieur à cette longueur d, traversent les mailles définies par les crêtes 19 des rails 18, au prix éventuellement d'une légère compression élastique, et sont aussitôt acheminées à travers la conduite 16 jusqu'au panier 17.Some of the balls considered to be worn, that is to say whose diameter is less than or equal to the length d or only slightly greater than this length d , pass through the meshes defined by the crests 19 of the rails 18, at the price possibly d 'a slight elastic compression, and are immediately routed through the pipe 16 to the basket 17.

Ce n'est pas le cas de toutes les boules usées dès leur premier passage dans le séparateur, car un certain nombre de celles-ci peuvent se trouver alors écartées des crêtes 19, voire au centre du courant liquide en circulation.This is not the case for all used balls as soon as they pass the separator for the first time, because a certain number of these may then be spaced from the ridges 19, or even at the center of the liquid current in circulation.

Mais il faut observer que, lors de la vie de chaque boule, le nombre de ses passages dans le séparateur est très élevé.But it should be observed that, during the life of each ball, the number of its passages in the separator is very high.

C'est ainsi qu'en général ces passages sont renouvelés deux fois par minute alors que la durée normale d'efficacité d'une boule dépasse généralement la semaine.This is how, in general, these passages are renewed twice a minute while the normal duration of effectiveness of a ball generally exceeds one week.

Si donc une boule usée n'est pas éliminée dès son premier passage consécutif à l'instant où son usure est devenue suffisante pour justifier l'élimination, la probabilité qu'elle soit éliminée peu de temps après, c'est-à-dire au cours des quelques passages suivants, est très grande et, comme le dispositif fonctionne en permanence, le rendement de la séparation automatique qu'il assure est excellent.If therefore a worn ball is not eliminated from its first consecutive pass at the moment when its wear has become sufficient to justify elimination, the probability that it will be eliminated soon after, that is to say during the next few passages, is very large and, as the device operates continuously, the efficiency of the automatic separation which it provides is excellent.

Lorsque le panier 17 est suffisamment rempli de boules usées, ce qui peut être déterminé automatiquement, notamment par comptage des boules restant dans l'installation à l'aide de l'organe 29, ce panier peut être dégagé à travers le couvercle 27 après fermeture provisoire des deux vannes 10 et 11.When the basket 17 is sufficiently filled with worn balls, which can be determined automatically, in particular by counting the balls remaining in the installation using the member 29, this basket can be released through the cover 27 after closing provisional of the two valves 10 and 11.

Une nouvelle charge de boules fraîches est ensuite introduite à travers l'embout 31, après dégagement du bouchon 30, en vue de compenser les boules éliminées.A new load of fresh balls is then introduced through the nozzle 31, after release of the plug 30, in order to compensate for the balls eliminated.

Pour déterminer automatiquement le degré de remplissage du panier 17 en boules usées, on pourrait monter directement sur la conduite 16 un compteur de boules.To automatically determine the degree of filling of the basket 17 with used balls, a ball counter could be mounted directly on the pipe 16.

En suite de quoi, et quel que soit le mode de réalisation adopté, on obtient finalement un dispositif d'élimination de boules usées pour une installation de nettoyage de faisceaux tubulaires dont la constitution et le fonctionnement résultent suffisamment de ce qui précède.Following this, and whatever the embodiment adopted, there is finally obtained a device for eliminating worn balls for a tube bundle cleaning installation, the constitution of which and operation result sufficiently from the above.

Ce dispositif présente de nombreux avantages par rapport à ceux antérieurement connus et en particulier les suivants :

  • il permet d'éliminer de l'installation uniquement les boules usées,
  • son exploitation est extrêmement simple puisque la séparation des boules usées est automatique et qu'il suffit de vider chroniquement le panier 17 lorsqu'il est rempli de boules usées et de réintroduire dans le collecteur 8 un nombre identique de boules fraîches,
  • le séparateur compris par ce dispositif est extrêmement robuste puisqu'il ne comprend aucune pièce mobile et il est très efficace puisqu'il ne peut pas être colmaté par les boules dont le diamètre est légèrement supérieur à celles usées que l'on désire éliminer.
This device has many advantages over those previously known and in particular the following:
  • it eliminates only used balls from the installation,
  • its operation is extremely simple since the separation of the used balls is automatic and it suffices to chronically empty the basket 17 when it is filled with used balls and to reintroduce into the collector 8 an identical number of fresh balls,
  • the separator included by this device is extremely robust since it does not include any moving parts and it is very effective since it cannot be clogged by balls whose diameter is slightly greater than the worn ones which it is desired to eliminate.

Claims (8)

  1. Device for removing worn elastic balls trom a cleaning installation for a tube bundle traversed by a liquid, said installation comprising, between the outlet (3) and the inlet (2) of the tube bundle (1), a recycling circuit for balls (4) comprising essentially a grid (5) extending across the outlet pipe (3) of said bundle so as to recover the balls emerging from this bundle, and a recycling pipe system (6) adapted to receive a flow of the above liquid charged with the balls thus recovered and to reinject this flow (in 14) into the inlet pipe (2) of the tube bundle, said pipe system traversing successively a drive pump (7) and a ball collector (8), said device comprising a static separator member (15) for worn balls mounted on the recycling pipe system (6), a bypass pipe (16) connected to said separator member so as to collect the separated worn balls and a basket (17) for collecting said balls connected to said bypass pipe, characterized in that the separator member (15) forms a section of the recycling pipe system (6), in that the separating openings for the worn balls comprised by this separator member are bounded by the crests (19) of parallel rails (18) extending in parallel with the liquid flow in said pipe system and forming together the bars of a sort of a grid, the distance (d) between these crests being slightly less than the diameter of the worn balls to be removed, the downstream ends of said rails being terminated by discontinuities (20) adapted to detach automatically from the rails the balls partially inserted between these rails without being able to pass between them and drawn by sliding along said rails, and an annular chamber (24,25) connected to the bypass pipe (16) being provided around the downstream ends of the rails.
  2. Device according to claim 1, characterized in that the constituent rails (18) of the separator member (15) are rectilinear.
  3. Device according to claim 2, characterized in that the crests (19) of the constituent rails (18) of the separator member (15) form the longitudinal bars of a cylindrical cage of revolution coaxial with the sections, of the recycling pipe system (6), between which said separator member is connected.
  4. Device according to claim 2, characterized in that the internal diameter of the cage is a little less than that of the sections of pipe system (6) between which the separator member is connected.
  5. Device according to claim 3, characterized in that the inner diameter of the cage is equal to that of the sections of pipe system (6) between which the separator member is connected.
  6. Device according to any one of the preceding claims, characterized in that the parallel rails (18) are constituted by small plates of constant thickness extending radially in a ring from a cylindrical casing of revolution (21), towards the axis of this casing.
  7. Device according to any one of the preceding claims, characterized in that the connection of the separator member (15) to the recycling pipe system (6) is effected upstream of the ball collector (8) and in that the basket (17) for gathering the worn balls is joined at the downstream end of the bypass pipe (16) and positioned inside the ball collector.
  8. Device according to any one of the preceding claims, characterized in that a removable diaphragm (28) is mounted in the bypass pipe (16), particularly at its downstream end.
EP89402129A 1988-07-27 1989-07-26 Apparatus for removing spent pellets from tube bundle cleaning installations Expired - Lifetime EP0353154B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8810128 1988-07-27
FR8810128A FR2634672B1 (en) 1988-07-27 1988-07-27 IMPROVEMENTS ON DEVICES FOR REMOVING WASTE BALLS FROM TUBULAR BEAM CLEANING PLANTS

Publications (2)

Publication Number Publication Date
EP0353154A1 EP0353154A1 (en) 1990-01-31
EP0353154B1 true EP0353154B1 (en) 1993-01-13

Family

ID=9368833

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402129A Expired - Lifetime EP0353154B1 (en) 1988-07-27 1989-07-26 Apparatus for removing spent pellets from tube bundle cleaning installations

Country Status (6)

Country Link
US (1) US4974662A (en)
EP (1) EP0353154B1 (en)
JP (1) JPH0633979B2 (en)
DE (1) DE68904373T2 (en)
ES (1) ES2036819T3 (en)
FR (1) FR2634672B1 (en)

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DE9309320U1 (en) * 1993-06-23 1994-11-03 Taprogge GmbH, 58300 Wetter Device for transferring cleaning bodies
FR2719243B1 (en) * 1994-04-28 1996-07-05 Technos Cie Improvements to tube cleaning installations by circulation of elastic balls.
US5680665A (en) * 1996-04-16 1997-10-28 Water Services Of America, Inc. Ball conditioning, sorting and collecting apparatus for circulating ball cleaning system
DE29610898U1 (en) * 1996-06-21 1997-10-23 Taprogge GmbH, 58300 Wetter Screening device for separating balls for cleaning the tubes of a heat exchanger, condenser or the like from a coolant line
DE29610900U1 (en) * 1996-06-21 1997-10-16 Taprogge GmbH, 58300 Wetter Ball lock for a device for returning balls for cleaning the pipes of cooling systems
FR2764529B1 (en) * 1997-06-11 1999-08-20 Technos & Co INSTALLATION FOR CLEANING A TUBULAR BEAM AND SORTING DEVICE FOR REMOVING USED CLEANING BALLS FROM SUCH AN INSTALLATION
FR2766915B1 (en) * 1997-07-31 1999-10-08 Beaudrey & Cie METHOD FOR THE MANAGEMENT OF SOLID ELEMENTS CIRCULATED IN A HEAT EXCHANGER FOR CLEANING THE SAME, AND CORRESPONDING INSTALLATION
DE19883011B4 (en) * 1998-08-06 2008-11-27 E. Beaudrey & Cie. Method and device for controlling or monitoring solid elements circulating in a heat exchanger for cleaning the same
FR2823560A1 (en) * 2001-04-13 2002-10-18 Beaudrey C S SOLID ELEMENT MANAGEMENT SYSTEM CIRCULATED IN A HEAT EXCHANGER FOR CLEANING THE SAME INCLUDING A SORTER AND SORTER FOR SUCH A MANAGEMENT INSTALLATION
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CN101027532B (en) * 2004-07-16 2010-05-26 合伟国际 System and apparatus for non-powered cleaning of tubular heat exchange systems
CN114111435A (en) * 2021-11-22 2022-03-01 神华国华寿光发电有限责任公司 Rubber ball system

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Also Published As

Publication number Publication date
US4974662A (en) 1990-12-04
ES2036819T3 (en) 1993-06-01
JPH0633979B2 (en) 1994-05-02
FR2634672A1 (en) 1990-02-02
EP0353154A1 (en) 1990-01-31
DE68904373D1 (en) 1993-02-25
FR2634672B1 (en) 1990-11-09
JPH02223796A (en) 1990-09-06
DE68904373T2 (en) 1993-06-24

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