EP0593818A1 - Apparatus for cleaning a steam generator - Google Patents

Apparatus for cleaning a steam generator Download PDF

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Publication number
EP0593818A1
EP0593818A1 EP92203215A EP92203215A EP0593818A1 EP 0593818 A1 EP0593818 A1 EP 0593818A1 EP 92203215 A EP92203215 A EP 92203215A EP 92203215 A EP92203215 A EP 92203215A EP 0593818 A1 EP0593818 A1 EP 0593818A1
Authority
EP
European Patent Office
Prior art keywords
injector
axis
lance
carriage
holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP92203215A
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German (de)
French (fr)
Inventor
Johannes Eugène Buitendijk
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.)
Innus Industrial Nuclear Services SA
Original Assignee
Innus Industrial Nuclear Services SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE9000639A priority Critical patent/BE1004430A3/en
Application filed by Innus Industrial Nuclear Services SA filed Critical Innus Industrial Nuclear Services SA
Priority to EP92203215A priority patent/EP0593818A1/en
Publication of EP0593818A1 publication Critical patent/EP0593818A1/en
Ceased legal-status Critical Current

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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
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/483—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers specially adapted for nuclear steam generators

Definitions

  • the invention relates to a device for cleaning a steam generator, a generator of the type which comprises an envelope, a bottom plate dividing the interior of the envelope into a lower part and an upper part a bundle of tubes mounted in the upper part with a longitudinal axis approximately perpendicular to the bottom plate, the inner end of the tubes passing through the bottom plate, a bundle in which a free space is provided by which at least part of the bundle is accessible and at least an access opening in the enclosure which opens onto the free space, device which comprises a carriage intended to be moved in the free space, above the bottom plate, a support which is adjustably mounted on the carriage about an axis which, during cleaning, is parallel to the axis of the beam, a rotary injector holder mounted on the support in a rotatable manner about an axis, which extends approximately perpendicularly adjustment to the above-mentioned adjustment axis of the support, at least one injector mounted on the injector holder, injector whose jet is directed substantially radially with respect to the
  • Steam generators of the kind depicted are used in particular in nuclear power plants. They can be of the so-called U-shaped type, in which the tube bundle extends in the shape of an inverted U and the free space which is provided in the bundle, is formed between the rising part and the falling part of the bundle. They can also be of the type known as O.T.S.G. (Once-through-steam-generator), in which all the tubes extend from bottom to top and the free space is formed by a half row of tubes which is omitted.
  • the heating fluid which is heated in the nuclear reactor is directed through the bundle and gives up heat to the secondary fluid, generally water, which fills the space around the tubes and is transformed into vapor.
  • an iron oxide i.e. magnetite
  • This iron oxide is deposited on the tubes and on the bottom plate from where it must be removed at each maintenance.
  • Such a device is known to BE 900,716 in the name of the applicant.
  • the support is adjusted on the carriage using a fairly rigid cable.
  • a compressed air motor mounted on the support, drives the injector holder.
  • the connection between the high pressure lance and the injector holder includes two rotary seals.
  • a first seal is mounted on the support and connected in rotation to the injector holder rotating about a horizontal axis.
  • the second seal is mounted between the first seal and the lance and allows rotation around a vertical axis of the support with the injector holder and the first seal.
  • This device is of a complicated and unwieldy construction. Given the presence of an engine and two rotary joints, it is quite large. Besides the device and the high pressure lance, a compressed air line for the engine and a cable to adjust the support must be introduced into the generator. The life of rotary joints is also limited.
  • the object of the invention is to remedy these drawbacks and to provide a device for cleaning a steam generator which is simple, easy to use, very handy and very compact and which does not include rotary seals.
  • connection between the high pressure lance and the injector holder includes a flexible hollow at high pressure, a drive connection between this hose and the above lance, transmitting the rotation of the lance to the hose and another drive connection between this hose and the injector holder, transmitting a rotation of the hose to the holder injector, the flexible allowing not only a transmission of rotation but also a change of direction of the injector holder around its axis of rotation.
  • the injector holder is driven using the high pressure lance itself, without the need for a rotary joint. A special motor is therefore not necessary for this drive.
  • the change of direction of the support in order to modify the spraying direction of the injector is done by hand, outside the steam generator. The removal and replacement of the device is very easy, since the device is or can be very compact.
  • a cleaning device for steam generators in which injector holders are driven by the high pressure lance is known per se from BE 8700181 in the name of the applicant.
  • the lance is connected by a rotary joint to a channel in the carriage, a channel which communicates by provided channels.
  • An injector holder is rotatably mounted on each support.
  • the lance drives all the injector holders at the same time using an auxiliary axis housed in the supports and gear wheel transmissions.
  • the carriage is movable on a guide which is introduced into the generator. To change the direction of an injector holder, you must replace, or detach and put back in another position, the support carrying this injector holder.
  • the device comprises a retractable foot mounted on the carriage and forming, in the non-retracted position, a support for the carriage on the bottom plate during cleaning.
  • the carriage can move at the height of the opening in the envelope through which it is introduced with the retracted foot.
  • the high pressure lance can therefore be a rigid lance.
  • the retractable foot is pivotally attached to the carriage.
  • the drive connection between the high pressure lance and the hose is mounted on a support member adjustable in the longitudinal direction of the high pressure lance on the carriage.
  • connection of this hose with the lance should preferably be further back when the injector holder extends in the extension of this axis than when it is directed obliquely in order to avoid excessive bending of the hose.
  • the device comprises blocking means mounted on the carriage to block it between the two parts of the beam located on either side of the space into which the device is introduced .
  • FIGS. 2 to 5 To clean a steam generator, as shown in fig. 1, a device shown in detail in FIGS. 2 to 5 through an opening 1 in the cylindrical envelope 2, vertical to the generator.
  • this generator comprises a bottom plate 3 dividing the interior of the envelope 2 into a lower part 4 and an upper part 5.
  • the lower part is divided by a partition into a inlet and outlet for the heating fluid passing through the tubes 6 of a bundle 7 in the shape of an inverted U.
  • This bundle 7 is mounted in the upper part 5.
  • the end of the tubes 6 of the rising part of the bundle passes through the bottom plate 3 and opens into the aforementioned inlet.
  • the tubes 6 of the descending part of the bundle 7 also pass through their bottom end this bottom plate 3 and lead to the abovementioned outlet.
  • a free space 8 is formed in which the device for cleaning can be introduced.
  • a horizontal distribution plate 9 This plate is crossed by the tubes 6 and is fixed to an inner cylindrical envelope not shown in the figures.
  • the opening 1 opens between the bottom plate 3 and the distribution plate 9 on the space 8, near the last plate.
  • the tubes 6 of the bundle 7 are arranged in a triangle design.
  • the rows of tubes 6 make angles of 30, 90 and 150 degrees with the plane of symmetry of the free space 8.
  • the device must spray liquid between these rows to clean the part of the generator located between the bottom plate 3 and the distribution plate 9, part where deposits are formed which must be removed regularly.
  • the device is moved in a discontinuous manner parallel to the above-mentioned plane of symmetry and to the bottom plate 3, stopping the device each time so that it can spray liquid at high pressure between one or more pairs of adjacent rows .
  • the direction in which the device is moved is indicated below by the longitudinal direction.
  • the device comprises a carriage 10 consisting of a hollow hollow base section 11 and a wider mounting box 12 fixed to this section 11.
  • wheels 13 projecting through openings 14 in the upper wall of the box. Two wheels are mounted at the front, the other two in protruding parts at the rear. These wheels 13, the axis of rotation of which is transverse, roll on the lower surface of the distribution plate 9.
  • front and rear have been considered in relation to the normal direction of advance of the device which is pushed by a high pressure lance 15. It is however obvious that cleaning can be carried out while the device is moving in opposite direction and is therefore drawn by the lance 15.
  • an axis 16 on which is fixed a retractable foot 17 which carries at its end and by means of a hydraulic cylinder 18, a transverse axle 19 carrying at its ends a wheel 20.
  • this foot In position working, shown in Figures 2 to 4, this foot extends vertically downward, through an opening in the profile 11 and the wheels 20 are supported on the bottom plate 3.
  • the cylinder 18 allows to tighten the device between the bottom plate 3 and the distribution plate 9 thus ensuring firm contact between the wheels 13 and the last plate of a part and the wheels 20 and the bottom plate 3 on the other hand.
  • the foot 17 In the retracted position, the foot 17 extends horizontally forwards, partly in the profile 11 which is open downwards at the front, which allows the device to pass through the opening 1.
  • the pivoting of the foot 17 is effected by means of two racks 21 moving in the longitudinal direction in the opposite direction, on guides 22 mounted on the upper and lower walls of the profile 11, inside the latter.
  • the two racks 21 cooperate with the same toothed wheel 23 fixed on the axis 16.
  • These racks 21 also cooperate with a second toothed wheel 24 fixed on a transverse axis 25 housed in the profile 11.
  • a lever 26 is fixed at one end in projection of this axis 25 and is provided at its free end with a handle 27 at the same time forming a lock blocking the lever 26 to a support 28 fixed to the rear of the box 12, on the profile 11.
  • the handle 27 carries a axial pin passing through the lever 26 and entering a notch in the support 28. This handle can be moved axially against a spring in order to remove the pin from the notch, thereby releasing the lever 26.
  • the box 12 carries two hydraulic cylinders 29 directed laterally tightening, during a device stop and therefore during spraying, the carriage 10 between two tubes 6 being on either side of the space 8, as shown in fig. 4.
  • the device is thus blocked in the horizontal direction while at the same time it is blocked in the vertical direction by the jack 18 as explained above.
  • the lines for the liquid for the jacks 18 and 29 and which extend essentially along the lance 15 have not been shown in the figures.
  • a spray head On a front part of the profile 11, protruding from the box 12 and partly in the box 12 open at the front, is mounted a spray head, adjustable around a vertical axis.
  • This head consists of a support 30, a cylindrical injector holder 31 housed in this support and several injectors 32 mounted in the injector holder 31, the jets of which are directed radially.
  • the support 30 can be adjusted in the direction around a vertical axis and for this purpose carries a vertical threaded axis 33 housed in the upper wall of the profile 11.
  • a nut 34 screwed onto the axis 33 makes it possible to block the support 30 in a determined position.
  • the injector holder 31 is mounted for rotation about its longitudinal axis in a bearing mounted in the support 30.
  • This injector holder 31 consists of three detachable parts and is provided with an axial channel 35. In the central part, this channel 35 communicates with two series of three radial channels 36 each opening onto an injector 32.
  • first rigid but detachable connection 37 between the injector holder 31 and a hollow high pressure hose 38 which extends through the box 12 and rests on the bottom wall thereof.
  • this first connection comprises on the one hand an end piece 39 fixed on one end of the hose 38 and carrying a nut 40 and on the other hand a threaded tube 41 secured to, for example screwed into, the injector holder 31.
  • the connection 37 In tightening the nut 40 on this tube 41, the hose 38 and the nozzle holder 31 are made integral, the connection 37 thus transmitting a rotation of the hose 38 to the nozzle holder 31.
  • connection 42 also comprises an end piece 39 fixed to the hose 38 and carrying a nut 40, of a on the other hand, and a threaded tube 41 fixed to a nozzle 43 itself fixed to the lance 15.
  • the latter end piece 43 is housed in the above-mentioned support 28.
  • the support 28 is mounted in an adjustable manner using two screws 44 on the profile 11.
  • the hose 38 When the injector holder 31 is directed laterally as shown in FIG. 4 the hose 38 must describe a curve and the connection 42 must be in the most advanced position.
  • the connection 42 When the injector holder 31 is in the extension of the longitudinal axis of the carriage 10, the connection 42 must be in a position further back in order to avoid bending of the hose 38.
  • the device described is very compact, especially if the foot 17 is retracted. With the retracted foot, the introduction and exit of the device through the opening 1 is very easy.
  • the drive of the injector holder 31 and more particularly the oscillation of the latter is done using the lance 15.
  • This lance which is rigid, also ensures the intermittent movement of the carriage 10.
  • the lance is oscillated by a motor 45 mounted on a flange 46 which is fixed outside the casing 2, around the opening 1.
  • a cylinder and piston device 47, also mounted on this flange ensures the intermittent longitudinal displacement of spear 15.
  • the handle 27 is released by means of a hook inserted through the opening 1 and the lever 26 is pivoted so as to take out the foot 17. Then the carriage 10 is clamped, when it is in a position in which the injectors 32 can spray between one or more pairs of rows of tubes 6, between the bottom plate 3 and the distribution plate 9 on the one hand and between two tubes 5 on either side of the space 8 on the other hand. After spraying, the carriage 10 is loosened, advanced by one step and tightened, after which the injector holder is again oscillated to spray between other rows. After one or more crossings of the free space 8, the carriage 10 is removed and possibly replaced with the injector holder 31 fixed in another position and the above operation is repeated. The sprayed liquid is collected on the bottom plate 3 and aspirated through suction lines 48.
  • the construction and handling of the device is very simple.
  • the number and nature of the injectors are easily changeable and the hose is also easily replaceable.

Abstract

Apparatus for cleaning a steam generator of the type which comprises a jacket (2),a bottom plate (3) dividing the interior of the jacket (2) into a lower part (4) and an upper part (5), a bundle (7) of tubes (6) mounted in the upper part (5) with a longitudinal axis which is approximately perpendicular to the bottom plate (3), the lower end of the tubes (6) passing through the bottom plate (3), in which bundle (7) a free space (8) is provided, via which a part at least of the bundle (7) is accessible, and at least one access opening (1) in the jacket (2) which opens onto the free space (8), which device comprises a carriage (9) intended to be displaced in the free space (8), above the bottom plate (3), a support (30) mounted in an adjustable manner on the carriage (10) about an axis which, during cleaning, is parallel to the axis of the bundle (7), a rotary injector-holder (31) mounted on the support (30) in a rotary manner about an axis which extends approximately perpendicularly to the abovementioned axis of adjustment of the support (30), at least one injector (32) mounted on the injector-holder (31), the jet of which injector (32) is directed essentially radially in relation to the axis of rotation of the injector-holder (31), a high-pressure lance (15) and a connection (37, 38, 42) between the lance (15) and the injector holder (31), which injector-holder (31) is provided with a duct (35, 36) between this connection and the injector (32), characterised in that the connection (37, 38, 42) between the high-pressure lance (15) and the injector-holder (31) comprises a hollow high-pressure flexible tube (38), a drive connection (42) between this flexible tube (38) and the abovementioned lance (15), transmitting the rotation from the lance (15) to the flexible tube (38), and another drive connection (37) between this flexible tube (38) and the injector-holder (31), transmitting a rotation from the flexible tube (38) to the injector-holder (31), the flexible tube (38) making possible not only a transmission of rotation but also a change in direction of the injector-holder (31) about its axis of rotation.

Description

L'invention concerne un dispositif pour le nettoyage d'un générateur de vapeur, générateur du type qui comprend une enveloppe, une plaque de fond divisant l'intérieur de l'enveloppe en une partie inférieure et une partie supérieure un faisceau de tubes monté dans la partie supérieure avec un axe longitudinal à peu près perpendiculaire à la plaque de fond, l'extrémité intérieure des tubes traversant la plaque de fond, faisceau dans lequel est prévu un espace libre par lequel une partie au moins du faisceau est accesible et au moins une ouverture d'accès dans l'enveloppe qui débouche sur l'espace libre, dispositif qui comprend un chariot destiné à être déplacé dans l'espace libre, au-dessus de la plaque de fond, un support monté de manière ajustable sur le chariot autour d'un axe qui au cours du nettoyage, est parallèle à l'axe du faisceau un porte-injecteur rotatif monté sur le support de manière rotative autour d'un axe, qui s'étend à peu près perpendiculairement à l'axe d'ajustage susdit du support, au moins un injecteur monté sur le porte-injecteur, injecteur dont le jet est dirigé sensiblement radialement par rapport de l'axe de rotation du porte-injecteur, une lance à haute pression et une connection entre la lance et le porte-injecteur, porte-injecteur qui est pourvu d'un canal entre cette connection et l'injecteur.The invention relates to a device for cleaning a steam generator, a generator of the type which comprises an envelope, a bottom plate dividing the interior of the envelope into a lower part and an upper part a bundle of tubes mounted in the upper part with a longitudinal axis approximately perpendicular to the bottom plate, the inner end of the tubes passing through the bottom plate, a bundle in which a free space is provided by which at least part of the bundle is accessible and at least an access opening in the enclosure which opens onto the free space, device which comprises a carriage intended to be moved in the free space, above the bottom plate, a support which is adjustably mounted on the carriage about an axis which, during cleaning, is parallel to the axis of the beam, a rotary injector holder mounted on the support in a rotatable manner about an axis, which extends approximately perpendicularly adjustment to the above-mentioned adjustment axis of the support, at least one injector mounted on the injector holder, injector whose jet is directed substantially radially with respect to the axis of rotation of the injector holder, a high pressure lance and a connection between the lance and the injector holder , injector holder which is provided with a channel between this connection and the injector.

Des générateurs de vapeur du genre dépeint sont notamment utilisés dans des centrales nucléaires. Ils peuvent être du type dit en U, dans lequel le faisceau de tube s'étend en forme de U renversé et l'espace libre qui est prévue dans le faisceau, est formé entre la partie montante et la partie descendante du faisceau. Ils peuvent également être du type dit O.T.S.G. (Once-through-steam-generator), dans lequel tous les tubes s'étendent de bas en haut et l'espace libre est formé par une demi rangée de tubes qui est omise.Steam generators of the kind depicted are used in particular in nuclear power plants. They can be of the so-called U-shaped type, in which the tube bundle extends in the shape of an inverted U and the free space which is provided in the bundle, is formed between the rising part and the falling part of the bundle. They can also be of the type known as O.T.S.G. (Once-through-steam-generator), in which all the tubes extend from bottom to top and the free space is formed by a half row of tubes which is omitted.

Dans ce type de générateur de vapeur, le fluide chauffant qui est échauffé dans le réacteur nucléaire, est dirigé à travers le faisceau et abondonne de la chaleur au fluide secondaire, en général de l'eau, qui remplit l'espace autour des tubes et est transformé en vapeur.In this type of steam generator, the heating fluid which is heated in the nuclear reactor, is directed through the bundle and gives up heat to the secondary fluid, generally water, which fills the space around the tubes and is transformed into vapor.

A cause de diverses réactions chimiques, il se forme dans l'espace autour du faisceau du tubes, un oxyde de fer, à savoir de la magnétite. Cet oxyde de fer se dépose sur le tubes et sur la plaque de fond d'où il doit être enlevé à chaque entretien.Due to various chemical reactions, an iron oxide, i.e. magnetite, is formed in the space around the tube bundle. This iron oxide is deposited on the tubes and on the bottom plate from where it must be removed at each maintenance.

En combinaison avec l'accesibilité difficile du générateur de vapeur est surtout à cause de la radio-activité y régnant, le générateur de vapeur ne peut pas être démonté de telle sorte que des dispositifs spéciaux du genre décrit ci-devant sont nécessaires pour enlever cet oxyde.In combination with the difficult accessibility of the steam generator is mainly due to the radioactivity prevailing there, the steam generator cannot be disassembled so that special devices of the kind described above are necessary to remove this oxide.

A l'aide d'un tel dispositif du liquide à haute pression est pulvérisé entre les rangées de tubes par les injecteurs montés sur le porte-injecteur à qui on donne un mouvement d'oscillation. Les tubes du faisceau peuvent être agencés selon un dessin triangulaire. La pulvérisation doit par conséquent être possible en trois directions différentes et c'est pour cette raison que le porte-injecteur est monté dans un support ajustable autour d'un axe parallèle au tubes du faisceau.With the help of such a device, high pressure liquid is sprayed between the rows of tubes by the injectors mounted on the injector holder which is given an oscillating movement. The bundle tubes can be arranged in a triangular design. Spraying must therefore be possible in three different directions and it is for this reason that the injector holder is mounted in an adjustable support around an axis parallel to the bundle tubes.

Un tel dispositif est connu de BE 900.716 au nom de la demanderesse. Dans ce dispositif le support est ajusté sur le chariot à l'aide d'un câble assez rigide. Un moteur à air comprimé, monté sur le support, entraîne le porte-injecteur. La connection entre la lance à haute pression et le porte-injecteur comprend deux joints rotatifs. Un premier joint est monté sur le support et relié à rotation au porte-injecteur tournant autour d'un axe horizontal. Le deuxième joint est monté entre le premier joint et la lance et permet la rotation autour d'un axe vertical du support avec le porte-injecteur et le premier joint.Such a device is known to BE 900,716 in the name of the applicant. In this device the support is adjusted on the carriage using a fairly rigid cable. A compressed air motor, mounted on the support, drives the injector holder. The connection between the high pressure lance and the injector holder includes two rotary seals. A first seal is mounted on the support and connected in rotation to the injector holder rotating about a horizontal axis. The second seal is mounted between the first seal and the lance and allows rotation around a vertical axis of the support with the injector holder and the first seal.

Ce dispositif est d'une construction compliquée et peu maniable. Etant donné la présence d'un moteur et de deux joints rotatifs, il est assez grand. Il faut introduire dans le générateur à part le dispositif et la lance à haute pression également une conduite d'air comprimé pour le moteur et un câble pour ajuster le support. La durée de vie des joints rotatifs est également limitée.This device is of a complicated and unwieldy construction. Given the presence of an engine and two rotary joints, it is quite large. Besides the device and the high pressure lance, a compressed air line for the engine and a cable to adjust the support must be introduced into the generator. The life of rotary joints is also limited.

L'invention a pour but de remédier à ces inconvénients et de procurer un dispositif pour le nettoyage d'un générateur de vapeur qui est simple, d'un emploi facile, très maniable et très compact et qui ne comprend pas de joints rotatifs.The object of the invention is to remedy these drawbacks and to provide a device for cleaning a steam generator which is simple, easy to use, very handy and very compact and which does not include rotary seals.

Dans ce but la connection entre la lance à haute pression et le porte-injecteur comprend un flexible creux à haute pression, une connection d'entraînement entre ce flexible et la lance susdite, transmettant la rotation de la lance au flexible et une autre connection d'entraînement entre ce flexible et le porte-injecteur, transmettant une rotation du flexible au porte-injecteur, le flexible permettant non seulement une transmission de rotation mais également un changement de direction du porte-injecteur autour de son axe de rotation.For this purpose the connection between the high pressure lance and the injector holder includes a flexible hollow at high pressure, a drive connection between this hose and the above lance, transmitting the rotation of the lance to the hose and another drive connection between this hose and the injector holder, transmitting a rotation of the hose to the holder injector, the flexible allowing not only a transmission of rotation but also a change of direction of the injector holder around its axis of rotation.

L'entraînement du porte-injecteur se fait à l'aide de la lance à haute pression même, sans qu'aucun joint rotatif ne soit nécessaire. Un moteur spécial n'est donc pas nécessaire pour cet entraînement. Le changement de direction du support afin de modifier la direction de pulvérisation de l'injecteur se fait à la main, en dehors du générateur du vapeur. La sortie et la remise en place du dispositif et très facile, étant donné que le dispositif est ou peut être très compact.The injector holder is driven using the high pressure lance itself, without the need for a rotary joint. A special motor is therefore not necessary for this drive. The change of direction of the support in order to modify the spraying direction of the injector is done by hand, outside the steam generator. The removal and replacement of the device is very easy, since the device is or can be very compact.

Un dispositif de nettoyage pour générateurs de vapeur dans lequel des porte-injecteurs sont entraînés par la lance à haute pression est connu en soi de BE 8700181 au nom de la demanderesse. Dans ce dispositif cependant la lance est connectée par un joint rotatif à un canal dans le chariot, canal qui communique par des canaux prévus dans des supports montés d'une manière stationaire mais détachable et à l'aide d'une construction de joint rotatif, avec les porte-injecteurs. Un porte-injecteur est monté à rotation sur chaque support. La lance entraîne tous les porte-injecteurs en même temps à l'aide d'un axe auxiliaire logé dans les supports et des transmissions à roues dentées. Le chariot est déplacable sur un guide qu'on introduit dans le générateur. Pour changer la direction d'un porte-injecteur il faut remplacer, ou détacher et remettre en place dans une autre position, le support portant ce porte-injecteur.A cleaning device for steam generators in which injector holders are driven by the high pressure lance is known per se from BE 8700181 in the name of the applicant. In this device, however, the lance is connected by a rotary joint to a channel in the carriage, a channel which communicates by provided channels. in supports mounted in a stationary but detachable manner and using a rotary joint construction, with the injector holders. An injector holder is rotatably mounted on each support. The lance drives all the injector holders at the same time using an auxiliary axis housed in the supports and gear wheel transmissions. The carriage is movable on a guide which is introduced into the generator. To change the direction of an injector holder, you must replace, or detach and put back in another position, the support carrying this injector holder.

Dans une forme de réalisation particulière de l'invention, le dispositif comprend un pied escamotable monté sur le chariot et formant, en position non-escamotée, un appui pour le chariot sur la plaque de fond au cours du nettoyage.In a particular embodiment of the invention, the device comprises a retractable foot mounted on the carriage and forming, in the non-retracted position, a support for the carriage on the bottom plate during cleaning.

Dans cette forme de réalisation le chariot peut se déplacer à hauteur de l'ouverture dans l'enveloppe par laquelle il est introduit avec le pied escamoté. La lance à haute pression peut par conséquent être une lance rigide.In this embodiment the carriage can move at the height of the opening in the envelope through which it is introduced with the retracted foot. The high pressure lance can therefore be a rigid lance.

De préférence le pied escamotable est fixé de manière pivotante au chariot.Preferably the retractable foot is pivotally attached to the carriage.

Dans une forme de réalisation efficace de l'invention, la connection d'entraînement entre la lance à haute pression et le flexible est montée sur un élément de support monté de manière ajustable dans le sens longitudinal de la lance à haute pression sur le chariot.In an effective embodiment of the invention, the drive connection between the high pressure lance and the hose is mounted on a support member adjustable in the longitudinal direction of the high pressure lance on the carriage.

Etant donné que la longueur du flexible est fixe, la connection de ce flexible avec la lance doit de préférence se trouver plus en arrière lorsque le porte-injecteur s'étend dans le prolongement de cet axe que quand il est dirigé en oblique afin d'éviter une courbure trop importante du flexible.Since the length of the hose is fixed, the connection of this hose with the lance should preferably be further back when the injector holder extends in the extension of this axis than when it is directed obliquely in order to avoid excessive bending of the hose.

Dans une autre forme de réalisation de l'invention, le dispositif comprend des moyens de blocage montés sur le chariot pour bloquer celui-ci entre les deux parties du faisceau situées de part et d'autres de l'espace dans lequel le dispositif est introduit.In another embodiment of the invention, the device comprises blocking means mounted on the carriage to block it between the two parts of the beam located on either side of the space into which the device is introduced .

D'autres particularités et avantages de l'invention ressortiront de la description suivante d'un dispositif de nettoyage d'un générateur, selon l'invention; cette description n'est donnée qu'à titre d'exemple non-limitatif et avec référence aux dessins annexés, dans lesquels :

  • La fig.1 est une representation schématique d'une partie d'un générateur de vapeur dans lequel un dispositif selon l'invention a été introduit;
  • la fig. 2 est une vue latérale du dispositif selon l'invention de la fig. 1 mais sur une échelle plus grande;
  • la fig. 3 représente une coupe selon la ligne III-III de la fig. 2;
  • la fig. 4 est une vue en plan du dispositif de la fig. 2;
  • la fig. 5 représente une coupe selon la ligne V-V de la fig. 4.
Other features and advantages of the invention will emerge from the following description of a generator cleaning device according to the invention; this description is given only by way of nonlimiting example and with reference to the appended drawings, in which:
  • Fig.1 is a schematic representation of part of a steam generator into which a device according to the invention has been introduced;
  • fig. 2 is a side view of the device according to the invention of FIG. 1 but on a larger scale;
  • fig. 3 shows a section along line III-III of FIG. 2;
  • fig. 4 is a plan view of the device of FIG. 2;
  • fig. 5 shows a section along the line VV of FIG. 4.

Pour nettoyer un générateur de vapeur on introduit, comme représenté à la fig. 1, un dispositif représenté en détail aux fig. 2 à 5 par une ouverture 1 dans l'enveloppe 2 cylindrique, verticale du générateur.To clean a steam generator, as shown in fig. 1, a device shown in detail in FIGS. 2 to 5 through an opening 1 in the cylindrical envelope 2, vertical to the generator.

Comme le montre la fig. 1, ce générateur comprend une plaque de fond 3 divisant l'intérieur de l'enveloppe 2 en une partie inférieure 4 et une partie supérieure 5. La partie inférieure est divisée par une cloison en une entrée et une sortie pour le fluide chauffant traversant les tubes 6 d'un faisceau 7 en forme de U renversée. Ce faisceau 7 est monté dans la partie supérieure 5. L'extrémité des tubes 6 de la partie montante du faisceau traverse la plaque de fond 3 et débouche dans l'entrée susdite. Les tubes 6 de la partie descendante du faisceau 7 traversent par leur extrémité inférieure également cette plaque de fond 3 et débouchent sur la sortie susdite.As shown in fig. 1, this generator comprises a bottom plate 3 dividing the interior of the envelope 2 into a lower part 4 and an upper part 5. The lower part is divided by a partition into a inlet and outlet for the heating fluid passing through the tubes 6 of a bundle 7 in the shape of an inverted U. This bundle 7 is mounted in the upper part 5. The end of the tubes 6 of the rising part of the bundle passes through the bottom plate 3 and opens into the aforementioned inlet. The tubes 6 of the descending part of the bundle 7 also pass through their bottom end this bottom plate 3 and lead to the abovementioned outlet.

Entre la partie montante et du partie descendante du faisceau 7 est formé un espace 8 libre dans lequel le dispositif pour le nettoyage peut être introduit. A une distance au-dessus de la plaque de fond 3 est montée une plaque de distribution 9 horizontale. Cette plaque est traversée par les tubes 6 et est fixée à une l'enveloppe cylindrique intérieure non représentée aux figures. L'ouverture 1 débouche entre la plaque de fond 3 et la plaque de distribution 9 sur l'espace 8, à proximité de la dernière plaque.Between the rising part and the falling part of the bundle 7 a free space 8 is formed in which the device for cleaning can be introduced. At a distance above the bottom plate 3 is mounted a horizontal distribution plate 9. This plate is crossed by the tubes 6 and is fixed to an inner cylindrical envelope not shown in the figures. The opening 1 opens between the bottom plate 3 and the distribution plate 9 on the space 8, near the last plate.

De l'eau circule autour des tubes 6 lorsque le générateur est en action. A cause du fluide chauffant circulant dans les tubes 6, cette eau est transformée en vapeur qui quitte la partie supérieure 5 par le haut à travers des turbines qui entraînent des générateurs de courant.Water circulates around the tubes 6 when the generator is in action. Because of the heating fluid circulating in the tubes 6, this water is transformed into vapor which leaves the upper part 5 from above at through turbines which drive current generators.

Comme le montre la fig. 3, les tubes 6 du faisceau 7 sont disposés selon un dessin en triangle. Les rangées de tubes 6 font des angles de 30, 90 et 150 degrées avec le plan de symmétrie de l'espace libre 8.As shown in fig. 3, the tubes 6 of the bundle 7 are arranged in a triangle design. The rows of tubes 6 make angles of 30, 90 and 150 degrees with the plane of symmetry of the free space 8.

Le dispositif doit pulvériser du liquide entre ces rangées pour nettoyer la partie du générateur sitée entre la plaque de fond 3 et la plaque de distribution 9, partie où se forment des dépôts qui doivent être enlevés régulièrement. On déplace le dispositif d'une manière discontinue parallèlement au plan de symmétrie susdit et à la plaque de fond 3 en arrêtant le dispositif chaque fois de manière à ce qu'il puisse pulvériser du liquide à haute pression entre une ou plusieurs paires de rangées adjacentes. La direction selon laquelle le dispositif est déplacé est indiquée ci-après par la direction longitudinale.The device must spray liquid between these rows to clean the part of the generator located between the bottom plate 3 and the distribution plate 9, part where deposits are formed which must be removed regularly. The device is moved in a discontinuous manner parallel to the above-mentioned plane of symmetry and to the bottom plate 3, stopping the device each time so that it can spray liquid at high pressure between one or more pairs of adjacent rows . The direction in which the device is moved is indicated below by the longitudinal direction.

Comme le montre les fig. 2 à 5, le dispositif comprend un chariot 10 constitué d'un profilé de base creux 11 longitudinal et d'un caisson de montage 12 plus large fixé sur ce profilé 11.As shown in figs. 2 to 5, the device comprises a carriage 10 consisting of a hollow hollow base section 11 and a wider mounting box 12 fixed to this section 11.

Dans le caisson 12 sont logées quatre roues 13 faisant saillie à travers des ouvertures 14 dans la paroi supérieure du caisson. Deux roues sont montées à l'avant, les deux autres dans des parties saillantes à l'arrière. Ces roues 13 dont l'axe de rotation est transversal, roulent sur la surface inférieure de la plaque de distribution 9.In the box 12 are housed four wheels 13 projecting through openings 14 in the upper wall of the box. Two wheels are mounted at the front, the other two in protruding parts at the rear. These wheels 13, the axis of rotation of which is transverse, roll on the lower surface of the distribution plate 9.

Les termes "avant" et "arrière" ont été considérés par rapport au sens d'avancement normal du dispositif qui est poussé par une lance à haute pression 15. Il est cependant évident que le nettoyage peut être effectué pendant que le dispositif se déplace en sens contraire et est donc tiré par la lance 15.The terms "front" and "rear" have been considered in relation to the normal direction of advance of the device which is pushed by a high pressure lance 15. It is however obvious that cleaning can be carried out while the device is moving in opposite direction and is therefore drawn by the lance 15.

Dans le profilé de base 11 est logé un axe 16 sur lequel est fixé un pied 17 escamotable qui porte à son extrémité et par l'intermédiaire d'un vérin hydraulique 18, un essieu 19 transversal portant à ses extrémités une roue 20. En position de travail, représentée aux figures 2 à 4, ce pied s'étend verticalement vers le bas, à travers une ouverture dans le profilé 11 et les roues 20 s'appuient sur la plaque de fond 3. Le vérin 18 permet de serrer le dispositif entre la plaque de fond 3 et la plaque de distribution 9 assurant ainsi un contact ferme entre les roues 13 et la dernière plaque d'une part et les roues 20 et la plaque de fond 3 d'autre part.In the base profile 11 is housed an axis 16 on which is fixed a retractable foot 17 which carries at its end and by means of a hydraulic cylinder 18, a transverse axle 19 carrying at its ends a wheel 20. In position working, shown in Figures 2 to 4, this foot extends vertically downward, through an opening in the profile 11 and the wheels 20 are supported on the bottom plate 3. The cylinder 18 allows to tighten the device between the bottom plate 3 and the distribution plate 9 thus ensuring firm contact between the wheels 13 and the last plate of a part and the wheels 20 and the bottom plate 3 on the other hand.

En position escamotée, le pied 17 s'étend horizontalement vers l'avant, en partie dans le profilé 11 qui est ouvert vers le bas à l'avant, ce qui permet le passage du dispositif à traver l'ouverture 1.In the retracted position, the foot 17 extends horizontally forwards, partly in the profile 11 which is open downwards at the front, which allows the device to pass through the opening 1.

Le pivotement du pied 17 se fait à l'aide de deux crémaillères 21 se déplaçant dans la direction longitudinale en sens opposé, sur des guides 22 montées sur les parois supérieure et inférieure du profilé 11, à l'interieur de celui-ci. Les deux crémaillères 21 coopèrent avec une même roue dentée 23 fixée sur l'axe 16. Ces crémaillères 21 coopèrent également avec une deuxième roue dentée 24 fixée sur un axe transversal 25 logé dans le profilé 11. Un levier 26 est fixé à une extrémité en saillie de cet axe 25 et est pourvu à son extrémité libre d'une poignée 27 formant en même temps un verrou bloquant le levier 26 à un support 28 fixé à l'arrière du caisson 12, sur le profilé 11. La poignée 27 porte une goupille axiale traversant le levier 26 et entrant dans un encoche dans le support 28. Cette poignée peut être déplaçée axialement à l'encontre d'un ressort afin de sortir la goupille de l'encoche libérant ainsi le levier 26.The pivoting of the foot 17 is effected by means of two racks 21 moving in the longitudinal direction in the opposite direction, on guides 22 mounted on the upper and lower walls of the profile 11, inside the latter. The two racks 21 cooperate with the same toothed wheel 23 fixed on the axis 16. These racks 21 also cooperate with a second toothed wheel 24 fixed on a transverse axis 25 housed in the profile 11. A lever 26 is fixed at one end in projection of this axis 25 and is provided at its free end with a handle 27 at the same time forming a lock blocking the lever 26 to a support 28 fixed to the rear of the box 12, on the profile 11. The handle 27 carries a axial pin passing through the lever 26 and entering a notch in the support 28. This handle can be moved axially against a spring in order to remove the pin from the notch, thereby releasing the lever 26.

Le caisson 12 porte deux vérins hydrauliques 29 dirigés latéralement serrant, lors d'un arrêt de dispositif et donc au cours d'une pulvérisation, le chariot 10 entre deux tubes 6 se trouvant de part et d'autres de l'espace 8, comme représenté à la fig. 4. Le dispositif est ainsi bloqué dans le sens horizontal tandis qu'en même temps il est bloqué dans le sens vertical par le vérin 18 comme expliqué ci-devant. Pour des raisons de clarté, les conduites pour le liquide pour les vérins 18 et 29 et qui s'étendent essentiellement le long de la lance 15 n'ont pas été représentées aux figures.The box 12 carries two hydraulic cylinders 29 directed laterally tightening, during a device stop and therefore during spraying, the carriage 10 between two tubes 6 being on either side of the space 8, as shown in fig. 4. The device is thus blocked in the horizontal direction while at the same time it is blocked in the vertical direction by the jack 18 as explained above. For reasons of clarity, the lines for the liquid for the jacks 18 and 29 and which extend essentially along the lance 15 have not been shown in the figures.

Sur une partie avant du profilé 11, dépassant le caisson 12 et en partie dans le caisson 12 ouvert à l'avant, est montée une tête de pulvérisation, de manière ajustable autour d'un axe vertical.On a front part of the profile 11, protruding from the box 12 and partly in the box 12 open at the front, is mounted a spray head, adjustable around a vertical axis.

Cette tête est constituée d'un support 30, d'un porte-injecteur 31 cylindrique logé dans ce support et de plusieurs injecteurs 32 montés dans le porte-injecteur 31, dont les jets sont dirigés radialement. Le support 30 peut être ajusté en direction autour d'un axe vertical et porte à cet effet un axe fileté vertical 33 logé dans la paroi supérieure du profilé 11. Un écrou 34 vissé sur l'axe 33 permet de bloquer le support 30 dans une position déterminée.This head consists of a support 30, a cylindrical injector holder 31 housed in this support and several injectors 32 mounted in the injector holder 31, the jets of which are directed radially. The support 30 can be adjusted in the direction around a vertical axis and for this purpose carries a vertical threaded axis 33 housed in the upper wall of the profile 11. A nut 34 screwed onto the axis 33 makes it possible to block the support 30 in a determined position.

Le porte-injecteur 31 est monté à rotation autour de son axe longitudinal dans un palier monté dans le support 30. Ce porte-injecteur 31 se compose de trois parties détachables et est pourvu d'un canal axial 35. Dans la partie centrale, ce canal 35 communique avec deux séries de trois canaux radiaux 36 débouchant chacun sur un injecteur 32. En remplaçant une ou plusieurs des parties du porte-injecteur 31 on peut changer le nombre et/ou la nature des injecteurs. On peut ainsi remplaçer la partie frontale ne comprenant pas d'injecteurs par une partie comprenant des injecteurs ou remplaçer la partie du milieu par une partie ayant un autre nombre ou d'autres injecteurs que celle représentée aux fig. 2 et 4.The injector holder 31 is mounted for rotation about its longitudinal axis in a bearing mounted in the support 30. This injector holder 31 consists of three detachable parts and is provided with an axial channel 35. In the central part, this channel 35 communicates with two series of three radial channels 36 each opening onto an injector 32. By replacing one or more of the parts of the injector holder 31, the number and / or the nature of the injectors can be changed. It is thus possible to replace the front part not comprising injectors by a part comprising injectors or to replace the middle part by a part having another number or other injectors than that represented in FIGS. 2 and 4.

Dans le support 30 est montée une première connection 37 rigide mais détachable entre le porte-injecteur 31 et un flexible creux à haute pression 38 qui s'étend à travers le caisson 12 et repose sur la paroi inférieure de celui-ci. En fait, cette première connection comprend d'une part un embout 39 fixé sur une extrémité du flexible 38 et portant un écrou 40 et d'autre part un tube fileté 41 solidaire du, par exemple vissé dans le, porte-injecteur 31. En serrant l'écrou 40 sur ce tube 41 on rend solidaire le flexible 38 et le porte-injecteur 31, la connection 37 transmettant ainsi une rotation du flexible 38 au porte-injecteur 31.In the support 30 is mounted a first rigid but detachable connection 37 between the injector holder 31 and a hollow high pressure hose 38 which extends through the box 12 and rests on the bottom wall thereof. In fact, this first connection comprises on the one hand an end piece 39 fixed on one end of the hose 38 and carrying a nut 40 and on the other hand a threaded tube 41 secured to, for example screwed into, the injector holder 31. In tightening the nut 40 on this tube 41, the hose 38 and the nozzle holder 31 are made integral, the connection 37 thus transmitting a rotation of the hose 38 to the nozzle holder 31.

L'autre extrémité du flexible 38 est connectée à la lance 15 d'une manière analogue à l'aide d'une deuxième connection 42. Cette connection 42 comprend également un embout 39 fixé au flexible 38 et portant un écrou 40, d'une part, et un tube fileté 41 fixé à un embout 43 lui-même fixé à la lance 15, d'autre part. Ce dernier embout 43 loge dans le support 28 susdit. En vissant l'écrou 40 sur le tube 41 on peut rendre solidaire le flexible 38 et la lance 15, le mouvement rotatif de la lance 15 pouvant ainsi être transmis au flexible 38.The other end of the hose 38 is connected to the lance 15 in a similar manner using a second connection 42. This connection 42 also comprises an end piece 39 fixed to the hose 38 and carrying a nut 40, of a on the other hand, and a threaded tube 41 fixed to a nozzle 43 itself fixed to the lance 15. The latter end piece 43 is housed in the above-mentioned support 28. By screwing the nut 40 onto the tube 41, the flexible hose 38 and the lance 15 can be made integral, the rotary movement of the lance 15 thus being able to be transmitted to the flexible 38.

Le support 28 est monté de manière ajustable à l'aide de deux vis 44 sur le profilé 11. Lorsque le porte-injecteur 31 est dirigé latéralement comme représenté à la fig. 4 le flexible 38 doit décrire une courbe et la connection 42 doit se trouver dans la position la plus avancée. Lorsque le porte-injecteur 31 se trouve dans le prolongement de l'axe longitudinal du chariot 10, la connection 42 doit se trouver dans une position plus en arrière afin d'éviter une courbure du flexible 38.The support 28 is mounted in an adjustable manner using two screws 44 on the profile 11. When the injector holder 31 is directed laterally as shown in FIG. 4 the hose 38 must describe a curve and the connection 42 must be in the most advanced position. When the injector holder 31 is in the extension of the longitudinal axis of the carriage 10, the connection 42 must be in a position further back in order to avoid bending of the hose 38.

Etant donné cette possibilité d'ajustement de la connection 42 et donc du support 28 qui la porte, pour chaque position extrème du levier 26, deux encoches sont prévues dans la paroi latérale du support 28 pour recevoir la goupille axiale de la poignée 27.Given this possibility of adjusting the connection 42 and therefore of the support 28 which carries it, for each extreme position of the lever 26, two notches are provided in the side wall of the support 28 to receive the axial pin of the handle 27.

Le dispositif décrit est très compact surtout si le pied 17 est escamoté. Avec le pied escamoté, l'introduction et la sortie du dispositif à travers l'ouverture 1 est très facile.The device described is very compact, especially if the foot 17 is retracted. With the retracted foot, the introduction and exit of the device through the opening 1 is very easy.

L'entraînement du porte-injecteur 31 et plus particulièrement l'oscillation de ce dernier se fait à l'aide de la lance 15. Cette lance, qui est rigide, assure également le déplacement intermittant du chariot 10. A cet effet, la lance est oscillée par un moteur 45 monté sur une bride 46 qui est fixée à l'extérieur de l'enveloppe 2, autour de l'ouverture 1. Un dispositif à cylindre et piston 47, également monté sur cette bride assure le déplacement longitudinal intermittant de la lance 15.The drive of the injector holder 31 and more particularly the oscillation of the latter is done using the lance 15. This lance, which is rigid, also ensures the intermittent movement of the carriage 10. For this purpose, the lance is oscillated by a motor 45 mounted on a flange 46 which is fixed outside the casing 2, around the opening 1. A cylinder and piston device 47, also mounted on this flange ensures the intermittent longitudinal displacement of spear 15.

Après l'introduction du chariot 10 dans l'espace 8, la poignée 27 est débloquée à l'aide d'un crochet introduit à travers l'ouverture 1 et le lévier 26 est pivoté de manière à sortir le pied 17. Ensuite le chariot 10 est serré, lorsqu'il se trouve dans une position dans laquelle les injecteurs 32 peuvent pulvériser entre une ou plusieures paires de rangées de tubes 6, entre le plaque de fond 3 et la plaque de distribution 9 d'une part et entre deux tubes 5 de part et d'autre de l'espace 8 d'autre part. Après pulvérisation, le chariot 10 est déserré, avancé d'un pas et reserré, après quoi le porte-injecteur est à nouveau oscillé pour pulvériser entre d'autres rangées. Après une ou plusieures traversées de l'espace libre 8 le chariot 10 est enlevé et eventuellement remis en place avec le porte-injecteur 31 fixé dans une autre position et l'opération susdite est répétée. Le liquide pulvérisé est receuilli sur la plaque de fond 3 et aspiré à travers des conduites de suction 48.After the carriage 10 has been inserted into the space 8, the handle 27 is released by means of a hook inserted through the opening 1 and the lever 26 is pivoted so as to take out the foot 17. Then the carriage 10 is clamped, when it is in a position in which the injectors 32 can spray between one or more pairs of rows of tubes 6, between the bottom plate 3 and the distribution plate 9 on the one hand and between two tubes 5 on either side of the space 8 on the other hand. After spraying, the carriage 10 is loosened, advanced by one step and tightened, after which the injector holder is again oscillated to spray between other rows. After one or more crossings of the free space 8, the carriage 10 is removed and possibly replaced with the injector holder 31 fixed in another position and the above operation is repeated. The sprayed liquid is collected on the bottom plate 3 and aspirated through suction lines 48.

La construction et le maniement du dispositif est très simple. Le nombre et la nature des injecteurs sont facilement changeables et le flexible est également facilement remplaçable.The construction and handling of the device is very simple. The number and nature of the injectors are easily changeable and the hose is also easily replaceable.

Il est bien entendu que l'invention n'est nullement limitée à la forme de réalisation décrite çi-devant et que bien des modifications peuvent y être apportées, notamment quant à la forme, à la disposition et au nombre des éléments intervenant dans sa réalisation, sans sortir du cadre de la présente demande de brevet.It is understood that the invention is in no way limited to the embodiment described above and that many modifications can be made thereto, in particular as to the form, the arrangement and the number of elements involved in its realization , without going beyond the scope of this patent application.

Claims (14)

Dispositif pour le nettoyage d'un générateur de vapeur, générateur du type qui comprend une enveloppe (2), une plaque de fond (3) divisant l'intérieur de l'enveloppe (2) en une partie inférieure (4) et une partie supérieure (5), un faisceau (7) de tubes (6) monté dans la partie supérieure (5) avec un axe longitudinal à peu près perpendiculaire à la plaque de fond (3), l'extrémité inférieure des tubes (6) traversant la plaque de fond (3), faisceau (7) dans lequel est prévu un espace libre (8) par lequel une partie au moins du faisceau (7) est accesible et au moins une ouverture d'accès (1) dans l'enveloppe (2) qui débouche sur l'espace libre (8), dispositif qui comprend un chariot (9) destiné à être déplacé dans l'espace libre (8), au-dessus de la plaque de fond (3), un support (30) monté de manière ajustable sur le chariot (10) autour d'un axe qui, au cours du nettoyage, est parallèle à l'axe du faisceau (7), un porte-injecteur (31) rotatif monté sur le support (30) de manière rotative autour d'un axe, qui s'étend à peu près perpendiculairement à l'axe d'ajustage susdit du support (30), au moins un injecteur (32) monté sur le porte-injecteur (31), injecteur (32) dont le jet est dirigé sensiblement radialement par rapport de l'axe de rotation du porte-injecteur (31), une lance à haute pression (15) et une connection (37, 38, 42) entre la lance (15) et le porte-injecteur (31), porte-injecteur (31) qui est pourvu d'un canal (35, 36) entre cette connection et l'injecteur (32), caractérisé en ce que la connection (37, 38, 42) entre la lance à haute pression (15) et le porte-injecteur (31) comprend un flexible creux à haute pression (38), une connection d'entraînement (42) entre ce flexible (38) et la lance (15) susdite, transmettant la rotation de la lance (15) au flexible (38) et une autre connection d'entraînement (37) entre ce flexible (38) et le porte-injecteur (31), transmettant une rotation du flexible (38) au porte-injecteur (31), le flexible (38) permettant non seulement une transmission de rotation mais également un changement de direction du porte-injecteur (31) autour de son axe de rotation.Device for cleaning a steam generator, generator of the type which comprises a casing (2), a bottom plate (3) dividing the interior of the casing (2) into a lower part (4) and a part upper (5), a bundle (7) of tubes (6) mounted in the upper part (5) with a longitudinal axis approximately perpendicular to the bottom plate (3), the lower end of the tubes (6) passing through the bottom plate (3), bundle (7) in which a free space (8) is provided by which at least part of the bundle (7) is accessible and at least one access opening (1) in the envelope (2) which opens onto the free space (8), device which comprises a carriage (9) intended to be moved in the free space (8), above the bottom plate (3), a support ( 30) adjustably mounted on the carriage (10) about an axis which, during cleaning, is parallel to the axis of the beam (7), a rotary injector holder (31) mounted on the supp ort (30) rotatably about an axis, which extends approximately perpendicular to the aforementioned adjustment axis of the support (30), at least one injector (32) mounted on the injector holder (31 ), injector (32) whose jet is directed substantially radially with respect to the axis of rotation of the injector holder (31), a high pressure lance (15) and a connection (37, 38, 42) between the lance (15) and the injector holder (31 ), injector holder (31) which is provided with a channel (35, 36) between this connection and the injector (32), characterized in that the connection (37, 38, 42) between the high pressure lance (15) and the injector holder (31) comprises a hollow high pressure hose (38), a drive connection (42) between this hose (38) and the above lance (15), transmitting the rotation of the lance (15) to the hose (38) and another drive connection (37) between this hose (38) and the injector holder (31), transmitting a rotation of the hose (38) to the injector holder (31), the flexible (38) allowing not only a transmission of rotation but also a change of direction of the injector holder (31) around its axis of rotation. Dispositif selon la revendication précédente, caractérisé en ce qu'il comprend un pied (17) escamotable monté sur le chariot (10) et formant, en position non-escamotée, un appui pour le chariot (10) sur la plaque de fond (3) au cours du nettoyage.Device according to the preceding claim, characterized in that it comprises a retractable foot (17) mounted on the carriage (10) and forming, in the non-retracted position, a support for the carriage (10) on the bottom plate (3 ) during cleaning. Dispositif selon la revendication précédente, caractérisé en ce que le pied (17) est fixé de manière pivotante au chariot (10).Device according to the preceding claim, characterized in that the foot (17) is pivotally fixed to the carriage (10). Dispositif selon la revendication précédente, caractérisé en ce qu'il comprend un levier de commande (26) monté sur un axe transversal (25) logé dans le chariot (10), une roue dentée (24) solidaire de cet axe (25), au moins une crémaillère (21) coopérant avec cette roue dentée (24), un guide (22) pour cette crémaillère (21) et une deuxième roue dentée (23) coopérant avec cette crémaillère (21) et solidaire d'un axe (16) logé dans le chariot (10), sur quel axe (16) le pied (17) est fixé.Device according to the preceding claim, characterized in that it comprises a control lever (26) mounted on a transverse axis (25) housed in the carriage (10), a toothed wheel (24) integral with this axis (25), at least one rack (21) cooperating with this gear (24), a guide (22) for this rack (21) and a second gear (23) cooperating with this rack (21) and integral with an axis (16 ) housed in the carriage (10), on which axis (16) the foot (17) is fixed. Dispositif selon la revendication précédente, caractérisé en ce qu'un dispositif de verrou est monté sur le levier (26) pouvant verrouiller ce dernier par rapport au chariot (10).Device according to the preceding claim, characterized in that a locking device is mounted on the lever (26) capable of locking the latter relative to the carriage (10). Dispositif selon l'une ou l'autre des revendications 2 à 5, caractérisé en ce que le pied (17) porte au moins une roue (20) à son extrémité libre.Device according to either of Claims 2 to 5, characterized in that the foot (17) carries at least one wheel (20) at its free end. Dispositif selon l'une ou l'autre des revendications 2 à 6, caractérisé en ce qu'un vérin (18) est monté sur le pied (17).Device according to either of Claims 2 to 6, characterized in that a jack (18) is mounted on the foot (17). Dispositif selon l'une ou l'autre des revendications précédentes, caractérisé en ce que le chariot (10) est pourvu de roues (13) faisant saillie vers le haut permettant de rouler sur la face inférieure d'une plaque de distribution (9) montée au-dessus de la plaque de fond (3) dans le générateur.Device according to either of the preceding claims, characterized in that the carriage (10) is provided with wheels (13) projecting upwards making it possible to roll on the underside of a distribution plate (9) mounted above the bottom plate (3) in the generator. Dispositif selon l'une ou l'autre des revendication précédentes caractérisé en ce que la connection d'entraînement (42) entre la lance (15) à haute pression et le flexible (38) est montée sur un élément de support (28) monté de manière ajustable dans le sens longitudinal de la lance (15) sur le chariot (10).Device according to either of the preceding claims, characterized in that the drive connection (42) between the high-pressure lance (15) and the hose (38) is mounted on a support element (28) mounted adjustable in the longitudinal direction of the lance (15) on the carriage (10). Dispositif selon l'une ou l'autre des revendications précédentes, caractérisé en ce qu'il comprend des moyens de blocage (29) montés sur le chariot (10) pour bloquer celui-ci entre les deux parties du faisceau (7) de part et d'autres de l'espace (8) dans lequel le dispositif est introduit.Device according to either of the preceding claims, characterized in that it comprises locking means (29) mounted on the carriage (10) for locking the latter between the two parts of the bundle (7) on the and others from the space (8) into which the device is introduced. Dispositif selon la revendication précédente, caractérisé en ce que les moyens de blocage (29) comprennent deux vérins.Device according to the preceding claim, characterized in that the locking means (29) comprise two jacks. Dispositif selon l'une ou l'autre des revendications précédentes, caractérisé en ce que la lance (15) est une lance rigide.Device according to either of the preceding claims, characterized in that the lance (15) is a rigid lance. Dispositif selon l'une ou l'autre des revendications précédentes, caractérisé en ce que plusieurs injecteurs (32) sont montés sur le porte-injecteur (31).Device according to either of the preceding claims, characterized in that several injectors (32) are mounted on the injector holder (31). Dispositif selon l'une ou l'autre des revendications précédentes, caractérisé en ce que le porte-injecteur (31) est composé d'au moins deux parties, au moins une des parties étant remplaçable.Device according to either of the preceding claims, characterized in that the injector holder (31) is composed of at least two parts, at least one of the parts being replaceable.
EP92203215A 1990-06-22 1992-10-20 Apparatus for cleaning a steam generator Ceased EP0593818A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE9000639A BE1004430A3 (en) 1990-06-22 1990-06-22 Device for cleaning a steam generator.
EP92203215A EP0593818A1 (en) 1990-06-22 1992-10-20 Apparatus for cleaning a steam generator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9000639A BE1004430A3 (en) 1990-06-22 1990-06-22 Device for cleaning a steam generator.
EP92203215A EP0593818A1 (en) 1990-06-22 1992-10-20 Apparatus for cleaning a steam generator

Publications (1)

Publication Number Publication Date
EP0593818A1 true EP0593818A1 (en) 1994-04-27

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EP92203215A Ceased EP0593818A1 (en) 1990-06-22 1992-10-20 Apparatus for cleaning a steam generator

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EP (1) EP0593818A1 (en)
BE (1) BE1004430A3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0696719A1 (en) * 1994-08-12 1996-02-14 Framatome Liquid jet cleaning apparatus for a tubular plate of a heat exchanger and its use
WO2001048434A1 (en) * 1999-12-23 2001-07-05 Olmi S.P.A. Tube nest heat exchanger with cleaning access
GB2558616A (en) * 2017-01-10 2018-07-18 Cape Environmental Services Onshore Ltd Biomass boiler cleaning method and apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1004430A3 (en) * 1990-06-22 1992-11-17 Innus Ind Nuclear Service Device for cleaning a steam generator.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255503A2 (en) * 1986-07-29 1988-02-03 Smet Jet N.V. Arrangement for cleaning a steam generator with a water jet
DE3806004A1 (en) * 1987-02-26 1988-09-08 Innus Ind Nuclear Service Cleaning unit for a heat exchanger
BE1004430A3 (en) * 1990-06-22 1992-11-17 Innus Ind Nuclear Service Device for cleaning a steam generator.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255503A2 (en) * 1986-07-29 1988-02-03 Smet Jet N.V. Arrangement for cleaning a steam generator with a water jet
DE3806004A1 (en) * 1987-02-26 1988-09-08 Innus Ind Nuclear Service Cleaning unit for a heat exchanger
BE1004430A3 (en) * 1990-06-22 1992-11-17 Innus Ind Nuclear Service Device for cleaning a steam generator.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0696719A1 (en) * 1994-08-12 1996-02-14 Framatome Liquid jet cleaning apparatus for a tubular plate of a heat exchanger and its use
FR2723634A1 (en) * 1994-08-12 1996-02-16 Framatome Sa DEVICE FOR CLEANING BY JET OF LIQUID OF A TUBULAR PLATE OF A HEAT EXCHANGER AND USE THEREOF.
WO2001048434A1 (en) * 1999-12-23 2001-07-05 Olmi S.P.A. Tube nest heat exchanger with cleaning access
GB2558616A (en) * 2017-01-10 2018-07-18 Cape Environmental Services Onshore Ltd Biomass boiler cleaning method and apparatus

Also Published As

Publication number Publication date
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