EP0696719A1 - Flüssigkeitsstrahl-Reinigungsvorrichtung für Rohrplatte eines Wärmetauschers und deren Verwendung - Google Patents

Flüssigkeitsstrahl-Reinigungsvorrichtung für Rohrplatte eines Wärmetauschers und deren Verwendung Download PDF

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Publication number
EP0696719A1
EP0696719A1 EP95401587A EP95401587A EP0696719A1 EP 0696719 A1 EP0696719 A1 EP 0696719A1 EP 95401587 A EP95401587 A EP 95401587A EP 95401587 A EP95401587 A EP 95401587A EP 0696719 A1 EP0696719 A1 EP 0696719A1
Authority
EP
European Patent Office
Prior art keywords
nozzles
cleaning
tubes
bundle
support
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.)
Withdrawn
Application number
EP95401587A
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English (en)
French (fr)
Inventor
Martin Bourdelet
Bernard Magnin
Alain Vouzellaud
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.)
Areva NP SAS
Original Assignee
Framatome SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0696719A1 publication Critical patent/EP0696719A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F28G15/00—Details
    • F28G15/04—Feeding and driving arrangements, e.g. power operation
    • 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
    • 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
    • F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
    • F28G1/166—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from external surfaces of heat exchange conduits

Definitions

  • the invention relates to a device for cleaning by liquid jet of a tube plate of a heat exchanger and in particular of a steam generator of a pressurized water nuclear reactor.
  • Pressurized water nuclear reactors include steam generators which heat and vaporize feed water using the heat transported by pressurized water to cool the reactor core.
  • the pressurized water nuclear reactors comprise, on each of their primary branches, a steam generator having a primary part in which the pressurized water circulates for cooling the reactor and a secondary part receiving feed water which is gradually heated and vaporized and leaves the secondary part of the steam generator in the form of steam which is sent to a turbine associated with the nuclear reactor to drive an alternator for the production of electric current.
  • Such steam generators comprise an outer casing of generally cylindrical shape arranged with its vertical axis and integral with a substantially horizontal tubular plate whose lower face or inlet face constitutes a wall of the water supply box for the generator of pressurized water vapor constituting the primary fluid.
  • the steam generator also comprises a bundle of bent U-shaped tubes each comprising two straight branches parallel to each other, the ends of which are fixed in holes passing through the tube plate between the lower face of entry of the tube plate and the upper face of exit by which the bundle tubes enter the secondary part of the steam generator which is delimited by an internal bundle envelope arranged in a position coaxial with inside the external envelope, so that an annular space is formed between the external wall and the internal envelope of the bundle.
  • the internal envelope has a lower end situated at a certain distance above the upper face of the tube plate, so as to provide a passage space for the steam generator feed water which is introduced. in the secondary part comprising the bundle disposed inside the internal envelope, through the annular space.
  • the passage and fixing holes of the bundle tubes in the tube plate are arranged in a regular network over the entire surface of the tube plate, with the exception of the peripheral part of the tube plate which constitutes an annular free path to the plumb of the annular space for supplying water and a central portion of diametrical direction constituting a central aisle or street of water on either side of which are arranged the straight branches of the tubes.
  • the tubes in the central part of the bundle delimit, between their straight branches, a free space extending in the axial direction of the tubes and of the bundle, above the central aisle of the tube plate.
  • a beam partition plate is generally placed inside the free space at the central part of the beam, in an arrangement parallel to the axis of the straight branches of the tubes and to the central aisle.
  • This plate can rest on the tube plate or have a lower edge disposed at a certain distance above the upper face of the tube plate.
  • the external envelope and the internal envelope of the bundle are generally pierced with openings arranged in diametrically opposite positions opening into the central free space of the steam generator harness.
  • the pressurized water which constitutes the primary coolant for the core is brought into a compartment of the water box, so as to be distributed under the inlet face of the tube plate, in the inlet ends of the bundle tubes.
  • Pressurized water at high temperature then circulates in the bundle tubes to exit through the outlet ends of these tubes in a second compartment of the water box connected to the primary circuit of the reactor to ensure the return of the cooling water. in the tank.
  • the feed water which is brought and distributed in the annular free space around the internal bundle envelope circulates from top to bottom in the annular free space, enters the bundle envelope below its end. lower then comes into contact with the bundle tubes through the wall of which the heat exchange takes place between the primary fluid and the feed water.
  • the feed water is gradually heated and then vaporized during its journey in contact with the bundle tubes in the vertical direction and from bottom to top.
  • the steam produced is dried in the upper part of the steam generator and leaves the external envelope by a tube connected to the upper end of the external envelope.
  • the steam produced which is used in the turbine of the reactor is condensed and recovered at the level of a condenser then returned to the steam generator, so that the secondary part of the steam generator in which the feed water circulates operates in circuit closed.
  • the feed water is treated and has chemical characteristics which limit its corrosion power as much as possible.
  • the supply water is loaded with corrosion products such as oxides which tend to deposit in the form of sludge in the parts of the secondary circuit where the water supply circulates at low speed and in particular on the upper outlet face of the steam generator tube plate between the bundle tubes.
  • the sludge deposited on the tube plate at the junction of the tubes of the bundle produces corrosion which can eventually lead to a reduction in the thickness of the tubes, the formation of cracks in their wall and possibly their rupture.
  • tubular plates of the steam generators must be cleaned regularly during the shutdown phases for maintenance and recharging of the nuclear reactor and even before industrial commissioning.
  • This cleaning can be carried out by sending water jets on the upper exit face of the tube plate, between the rows of tubes of the bundle, in the direction from the center towards the periphery of the bundle.
  • the sludge is detached from the outlet face of the tube plate and directed towards the peripheral free space situated around the lower part of the bundle on the upper face of the tube plate where it is sucked, for example by a pipe introduced by a opening through the outer casing of the steam generator.
  • the tubes of the bundle are arranged in rows in which the tubes constitute flat sheets parallel to the axis of the bundle. Between two successive parallel rows of bundle tubes, a rectilinear free space is provided which is plumb with a zone of the tubular plate opening, at one of its ends, in the central space of the tubular plate constituting the central aisle and, at its other end, in the peripheral space where the sludge separated by the jets of liquid is collected during cleaning.
  • the cleaning operation consists in directing a jet of liquid under high pressure, along each of the aisles of the tube plate between two rows of tubes, so as to carry out a sweeping of the aisle between the rows of tubes, from the aisle central to the peripheral space in which the sludge is collected. In this way, the sludge is drawn towards the peripheral space.
  • These cleaning devices are generally introduced into the envelope of the steam generator, through a pair of openings passing through the envelope of the steam generator and placed in diametrically opposite arrangements.
  • a carriage is movably mounted on the rail which is designed to provide flexibility in a direction perpendicular to the partition plate and to the axes of the tubes and a rigidity in the direction of the axis of the tubes sufficient to support the mobile carriage.
  • the carriage carries one or more cleaning ramps which each comprise a set of nozzles whose axes are directed along planes parallel to the rows of tubes of the bundle and which can be supplied with liquid under high pressure, so as to form jets which are led successively, during the movement of the carriage on the rail, in each of the aisles between the rows of tubes.
  • the sweeping of each of the aisles is carried out by oscillating the nozzles around an axis parallel to the guide rail of the carriage, so as to move the jet between a position making it possible to reach the central aisle and a position inclined towards the outside to reach the peripheral space of the steam generator.
  • Such a device is complex, insofar as it is necessary to provide means for moving the carriage which can be introduced into the envelope of the steam generator by a manhole and means making it possible to oscillate the nozzles between two positions extremes.
  • the rows of tubes and the aisles between the rows that open into the central aisle have three different directions.
  • the aisles of a first set are directed perpendicular to the water street and to the rail of the cleaning device, a second set has aisles directed at 30 ° and a third set has aisles directed at 150 ° to the street central water and to the guide rail of the cleaning device.
  • the cleaning device must therefore include ramps having sets of nozzles directed in the three directions of the aisles between the tubes, which complicates the production and the positioning of the device in each of its working positions.
  • the object of the invention is therefore to propose a device for cleaning by liquid jet of a tube plate of a heat exchanger comprising a substantially cylindrical external envelope, a transverse tube plate integral with the external envelope, a bundle of tubes, the ends of which are fixed in holes passing through the tube plate between an entry face of the tube plate constituting a wall of a water box and an exit face through which exit the tubes of the bundle which have parallel straight branches between them and which are arranged in a regular network in the transverse planes parallel to the faces of the tube plate, the bundle delimiting a central free space in the axial direction of the straight branches of the tubes, above a central aisle of diametrical direction on the exit face of the plate tubular, in which is disposed a separation plate parallel to the axial direction of the tubes, the cleaning device comprising a semi-rigid rail provided with fixing means inside the steam generator, between two diametrically opposed openings passing through the outer casing and against the partition plate, a support mounted movable on the rail in a diametrical direction of
  • the cleaning device further comprises means for positioning the support and the nozzle holder in any position for cleaning a set of aisles between the rows of tubes opening into the central aisle , comprising a support and centering means intended to cooperate with at least one tube of the bundle and an actuation means controlled by the cleaning liquid, for the application of the support and centering means against the tube, with resumption of effort by the separation plate.
  • the cleaning device comprises, in the case of cleaning a tubular plate of a steam generator comprising a bundle of tubes arranged in a triangular mesh network, a first set of cleaning nozzles mounted oscillating on the support and directed perpendicular to the guide rail of the support, and at least one set of cleaning nozzles mounted fixed on the support, aligned along an elliptical line having for axis the axis of oscillation of the nozzles of the first set and directed at 60 ° relative to the axis of the nozzles of the first set as well as means for supplying cleaning liquid constituted by a tubular support for the nozzles of the first assembly mounted to oscillate and comprising at least one successive supply opening for the nozzles of the second set arranged along the elliptical line, during the oscillation of the nozzles of the first set and their support.
  • Figure 1 is an exploded perspective view of the lower part of a steam generator in which is carried out an operation of cleaning the tube plate and the lower part of the bundle using a device according to the invention.
  • Figure 2 is a half-view in section through a transverse plane of the steam generator into which is introduced a cleaning device according to the invention.
  • Figure 3 is a top view of a part of the cleaning device constituted in the form of a launching ramp.
  • FIG. 4 is an elevation view along 4 of FIG. 3.
  • FIG. 5 is a view in section through an axial plane of a first longitudinal part of the ramp shown in FIGS. 3 and 4.
  • FIG. 6 is a view in section through an axial plane of a second longitudinal part of the ramp shown in FIGS. 3 and 4.
  • FIG. 7 is a sectional view along 7-7 of FIG. 4.
  • FIG. 8 is a sectional view along 8-8 of FIG. 4.
  • FIG. 9 is a sectional view along 9-9 of FIG. 4.
  • FIG. 1 there is shown the lower part 1 of a steam generator comprising an outer casing 2 of substantially cylindrical shape arranged with its vertical axis, a bundle of tubes 3 inside a bundle casing 4 disposed coaxially inside the outer casing 2 and a tubular plate 5 delimiting a water box 6 of hemispherical shape constituting the lower part of the steam generator.
  • the tubular plate 5 is traversed by a network of openings having a regular arrangement, in each of which is fixed one end of a tube of the bundle 3.
  • Each of the tubes of the bundle 3 has the shape of a U and has two straight branches parallel to each other which are engaged at their end in two holes in the tube plate opening into the water box 6, on either side of a partition wall of the water box separating the latter into a hot collector into which enters the reactor cooling water coming from the tank and heated by the heat released by the core and a cold collector in which the cooling water having circulated in the tubes of the bundle 3 so as to ensure, by thermal transfer, the heating and vaporization of the feed water introduced in the envelope of the generator 2 by means of pipes 9.
  • Tubing 7 opening into the hot manifold of the water box ensures the junction of the water box with a pipe from the primary circuit of the reactor connected to the tank.
  • a second tube 8 opening into the cold collector of the water box 6 ensures the connection of the water box to a second pipe of the primary circuit by which the water is returned to the vessel of the nuclear reactor.
  • the steam generator feed water penetrating inside the external envelope 2 via the pipes 9 flows from top to bottom in an annular space formed between the external envelope 2 and the bundle envelope 4 to come into contact with the bundle tubes 3 at the lower part of the bundle casing 4 which is situated at a certain distance above the upper face of the tube plate 5.
  • the tubular plate 5 comprises a central aisle of diametral direction 12 which is not pierced with holes for crossing tubes and which separates the tubular plate into two parts in which the plate is crossed by holes arranged in a regular network.
  • the U-shaped bundle tubes are mounted on the tube plate, so that one of their straight branches is fixed at its end on one side of the central aisle 12 of the tube plate and their second straight branch of the other side of the central aisle 12 or water street along which the steam generator water is collected, when it is emptied.
  • the tubes are fixed, the curved part of which has the smallest radius of curvature, which are aligned to form two rows of straight branches on either side of the water street and delimit, at the central part of the bundle, a free space 13 parallel to the straight branches of the tubes and located directly above the street d central water 12.
  • a beam separation plate 10 having a vertical and diametral arrangement inside the beam and separating the beam into two parts, each of the parts of the beam comprising all of the first branches or seconds bundle tube branches 3.
  • the separation plate 10 is fixed inside the bundle over a certain height and passes through each of the spacer plates 11 ensuring the maintenance of the tubes of the bundle 3 according to a regular network, each of the spacer plates being made up of two half-plates between which the separation plate 10 passes.
  • Openings 14 called fist holes passing through the external envelope 2 of the steam generator are arranged in two diametrically opposite locations on the external envelope 2 of the steam generator, on either side of the central free space 13 in which is placed the vertical separation plate 10 resting by its lower part on the tubular plate 5, at the level of the water street 12 of the steam generator.
  • the bundle envelope is also pierced with openings, facing the fist holes 14, so that it is possible, through the fist holes 14, to access each of the parts of the bundle, on either side of the separation plate 10.
  • the tubular plate 5 also comprises an annular peripheral part 15 disposed directly above the annular space, between the external envelope 2 of the steam generator and the bundle envelope 4, which is not pierced with openings of passage and fixing of tubes from beam, this zone being outside the envelope 4 in which the beam 3 is arranged.
  • the supply water circulating in the secondary circuit of the steam generator comprising the interior space of the external envelope 2 of the steam generator, above the tube plate 5, becomes progressively charged with corrosion products such as oxides which constitute sludge tending to settle in areas where the supply water of the secondary circuit has a low speed.
  • the sludge accumulates on the upper face of the tube plate 5, between the tubes of the bundle 3.
  • the deposit of sludge on the tube plate can cause some corrosion of the tubes of the bundle, in the exit zone of the tubular plate.
  • FIGS. 1 and 2 Such a device 16 produced according to the invention has been shown in FIGS. 1 and 2.
  • the device 16 comprises a straight rail 17 which is introduced into the free space 13 through the fist holes 14, fixed at its ends to the envelope of the steam generator, so as to be in tension and pressed against the plate separation 10 of the beam, in an area located above the upper face of the tube plate 5 and below the spacer plate 11 located lowest in the bundle 3.
  • the rail 17 guides a support 18 which can be moved by sliding on the rail 17, above the water street 12 in diametrical direction and along its entire length, thanks to a flexible conduit 20 by the through which one can ensure a thrust on the support 18 mounted sliding on the rail 17, from outside the envelope of the steam generator, manually or by using a displacement device 21 comprising a puller-pusher.
  • the support 18 of the cleaning device 16 comprises at least one cleaning ramp 19 comprising nozzles which can be inclined so that jets of cleaning liquid coming from the nozzles of the ramp 19 reach the upper face of the tube plate 5 in the aisles between rows of bundle tubes 3.
  • the flexible conduit 20 is also connected to the ramp 19 at one of its ends and to a means for distributing liquid under cleaning pressure at its other end, such as a pump, so as to supply the ramp 19, a pressurized liquid which is ejected by the nozzles of the boom 19 in the form of rectilinear jets with a strong impact effect.
  • the openings passing through the tube plate 5 and the tubes 22 of the bundle 3 are arranged in a triangular mesh network, so that the aisles between the rows rectilinear tubes 22 have three different directions 23a, 23b and 23c respectively making an angle of 90 °, 30 ° and 150 ° with an oriented axis 24 disposed longitudinally in the central water street 12.
  • Efficient cleaning of the tube plate and of the lower part of the tubes 22 can be achieved by successively sending jets of water with a strong impact effect towards the tube plate 5, in the free spaces between the rows of the tubes located perpendicular to the aisles directed along at least one of the directions 23a, 23b and 23c.
  • the support 18 of the launching ramp 19 of the cleaning device 16 according to the invention makes it possible to move the ramp 19 step by step, so as to successively ensure the sweeping and cleaning of all the aisles between the tubes of the generator bundle of steam located in at least one of directions 23a, 23b and 23c.
  • the scanning will be carried out successively along a set of two aisles of directions 23a and 23b or 23a and 23c or alternatively along a set of three aisles directed along the three directions 23a, 23b and 23c.
  • each of the radial direction aisles of the tubular plate 5 of the steam generator causes the sludge to become detached and to be entrained in the peripheral free space 15 inside which the sludge is sucked up by a device 25 constituted for example by one or more pipes connected to a suction means on which are arranged suction strainers resting on the tubular plate, at the level of the central peripheral space 15.
  • the suction device 25 can be introduced into the envelope of the steam generator through the fist holes 14.
  • the movable support 18 of the ramp 19 is produced in the form of a plate comprising on its rear face a dovetail opening 26 intended to come to engage on the rail 17 whose profile has a dovetail profile corresponding to the profile of the opening 26.
  • the rail 17 is produced in the form of a semi-rigid strip made of a material such as a plastic material whose lateral edges are inclined; the rail 17 has a section whose length / width ratio is such that the rail 17 has a certain flexibility when stressed in a direction perpendicular to the large faces of the rail and is perfectly rigid in a direction parallel to these large faces.
  • the support 18 of the ramp 19 can be engaged on one of the ends of the rail which provides its support and moved along the length of the rail 17.
  • the rigidity of the rail 17 in the transverse directions parallel to the large faces of the rail makes it possible to maintain the support 18 and to resume the forces exerted in reaction on the ramp 19, during the formation of the cleaning jets.
  • the ramp 19 comprises two end parts 27 and 28 fixed by screws, respectively 27 'and 28', on the support 18 and a part 30 of generally tubular shape with circular section mounted to rotate around its axis in parts 27 and 28 of the ramp constituting a nozzle holder and comprising a central part 29 on which are mounted three nozzles 31 directed in a direction perpendicular to the axis of the nozzle holder 30 of the ramp, itself parallel to the rail 17.
  • the nozzles 31, the spacing of which corresponds to a multiple of the distance between the rows of tubes of the bundle, for example the distance of which is equal to twice the distance between the rows of tubes, make it possible to clean the aisles between the rows of tubes perpendicular to the separation plate 10, that is to say the aisles of direction 23a perpendicular to the longitudinal direction 24 of the water street 12 disposed at the central part of the tube plate of the steam generator.
  • the direction 33b corresponds to an inactive position of the nozzles, the effective action of which begins when the nozzles pass along the vertical, this action extending during the pivoting of the nozzle holder 30 carrying the nozzles 31, until the axes nozzles have reached in direction 33a.
  • the position of the axis of the nozzles along the vertical corresponds to an impact of the jet of the nozzles on the central aisle 12 of the tubular plate corresponding to the water street and the position of the nozzles with their axis along the direction 33a corresponds to an impact of the jet of nozzles in the vicinity of the peripheral space 15 of the tube plate.
  • the nozzle holder 30 has a recess 30a having an angular amplitude slightly greater than 90 °, along its periphery.
  • a stop 32 is fixed on the fixed part 27 of the body of the ramp 19 slightly projecting inside the central part movable in rotation 29, so as to come to engage in the recess 30a.
  • FIG. 9 shows a nozzle 31 which is fixed in the wall of the nozzle holder 30, so that the channel for forming a jet of liquid from the nozzle is arranged in a radial direction of the nozzle holder 30 and in communication with the central bore of the nozzle holder.
  • FIG. 9 also shows the extreme positions 33a and 33b of the axis of the jet forming channel of the nozzle 31 arranged on either side of the vertical 33 passing through the axis of the nozzle holder 30 .
  • the end portions 27 and 28 of the ramp 19 fixed on the mobile support 18 each have two recesses of elliptical shape respectively 34a and 34b as regards the part 27 and 35a and 35b as regards the part 28, having as axis the axis common to the two bores of the parts 27 and 28 along which the nozzle holder is rotatably mounted 30.
  • the recesses 34a, 34b, 35a and 35b have, as can be seen in FIGS. 5 and 6, sections by an axial plane, substantially in the form of an asymmetrical V, the two sides of which are inclined differently with respect to the axial direction.
  • the sides of the V-shaped cross sections of the elliptical recesses 34a, 34b, 35a and 35b most inclined with respect to the axis of rotation of the part 30 make an angle of 30 ° or 150 ° with the axial direction.
  • each of the elliptical recesses are crossed by successive openings arranged along an elliptical line constituting sets of openings 36a, 36b, 37a and 37b disposed respectively on the recesses 34a, 34b, 35a and 35b.
  • the openings of the sets of openings 36a, 36b, 37a, 37b pass through a wall of the fixed parts 27 and 28 of the ramp 19, between the bore in which the nozzle holder 30 is rotatably mounted and the most inclined outer surface of the corresponding recess, in a direction perpendicular to the most inclined face of the recess, this direction making an angle of 30 ° with the axis of rotation of the tubular part 30, that is to say an angle of 60 ° with the axial direction of the nozzles 31 along which jets of cleaning liquid are directed in the aisles between the rows of tubes directed by the direction 23a shown in FIG. 2.
  • the openings of the sets of openings 36a and 36b whose axis is directed at 60 ° relative to the axis of the nozzles 31 are therefore directed along the direction aisles 23b making an angle of 60 ° with the direction 23a.
  • the openings of the sets of openings 37a and 37b machined in the fixed part 28 of the ramp 19 have axes directed along spaces between the rows of direction tubes 23c at 150 ° relative to direction 24.
  • the sets of openings 36a and 36b on the one hand and 37a and 37b on the other hand constitute fixed nozzles capable of sending jets of liquid into free spaces between the rows of tubes.
  • the successive openings arranged on an elliptical line constituting a set of openings such as 36a, 36b, 37a or 37b have an increasing inclination relative to the vertical, along each of the elliptical lines on which the openings are arranged.
  • the first opening is directed practically along the vertical, so as to form a jet whose point of impact on the tube plate is located substantially at the level of the water street 12 of the tube plate.
  • the opening of the set of openings disposed at the other end of the helical line has an inclination relative to the vertical such that the jet formed by this opening constituting a cleaning nozzle strikes the tubular plate in the vicinity of the space free peripheral 15.
  • the intermediate openings also constituting cleaning nozzles have inclinations with respect to the vertical intermediate between the inclinations of the two end nozzles, so as to direct a cleaning jet along zones of an aisle between two rows of intermediate tubes between the street central water and peripheral free space.
  • the wall of the tubular part 30 is crossed, at each of the sets of openings 36a, 36b, 37a, 37b by a light of substantially rectangular shape, respectively 38a, 38b, 39a, 39b.
  • the slots 38a, 38b, 39a and 39b move relative to the openings of the sets of openings 36a, 36b, 37a , 37b, so as to bring the openings of the sets of openings into communication, successively and gradually with the internal bore of the part 30 by means of which the nozzles are supplied with cleaning liquid under very high pressure.
  • the aisles are swept between the rows of tubes aligned in the inclined directions 23b and 23c.
  • the lights 38a, 38b, 39a, 39b are provided so that, when the axis of the nozzles 31 is directed in the direction 33b, that is to say in a direction making an angle of less than 10 ° with the vertical 33 (see FIG. 9), none of the openings of the sets of openings 36a, 36b, 37a, 37b is in communication via a light, with the bore of the tubular part 30.
  • the first opening of each of the sets of openings is brought into communication with the corresponding light, then the following openings, so as to carry out a progressive scanning along the aisles inclined in the directions 23b and 23c.
  • the ramp 19 is fixed to one end of the flexible conduit 20 by means of which the ramp is moved from outside the envelope of the steam generator.
  • an additional device is therefore used for precise positioning of the ramp relative to the rows of tubes.
  • the device 40 comprises a support and centering piece 41 comprising an opening 41a of trapezoidal shape or any shape adapted to the external shape and to the diameter of the tubes, flared in the direction of the external part of the ramp 19 directed towards the tube 22 of bundle 3 and open to the outside.
  • the part 41 is connected to the end parts of two rods 42 and 42 'constituting two guide and return rods engaged in two transverse openings machined in the body 43 of the device fixed to the body of the ramp 19, as can be seen in FIG. 8.
  • Each of the guide and return rods 42 and 42 ' has an enlarged head bearing on a helical return spring 44 or 44' mounted inside the transverse opening of the body 43 of the positioning device.
  • the body 43 of the positioning device comprises a cylindrical opening 45 constituting a cylinder in which a sliding actuating piston 45 ′ is mounted slidingly bearing by a part end on the support and centering piece 41.
  • the cylinder 45 communicates, via a first channel 46 and a second channel 46 'machined in the support 43 and in the ramp body 19, with the internal bore of the tubular part 30, via a light 47 passing through the wall of the tubular part 30 and extending over an arc of an amplitude substantially equal to 90 °.
  • the position of the light 47 relative to the channel 46 ' is such that the cylinder 45 is in communication with the bore of the tubular part 30 by which the cleaning liquid under pressure reaches the nozzle, as soon as the tubular part 30 is in an orientation such that the axis of the oscillating nozzles 31 is along the vertical 33.
  • the cylinder 45 then remains in communication with the bore of the tubular part 30, during the pivoting movement of the tubular part 30 to direct the nozzles 31 so as to carry out the scanning of a set of aisles between the tubes over all their length.
  • the support and centering device 41 being in its retracted position shown in FIG. 3, the ramp 19 fixed to the end of the conduit 20 can be moved inside the central space of the bundle, above the water street 12 of the tubular plate, by pushing or pulling on the tube 20, from outside the steam generator.
  • the displacement of the ramp 19 which is integral with the movable support 18 is guided by the rail 17.
  • the positioning of the nozzles 31 is identified in the extension of three aisles between the rows of tubes which must be perform cleaning. This positioning of the ramp 19 by identifying the position or the displacement of the duct 20 is carried out approximately.
  • the tubular part 30 is then made to pivot, via the conduit 20, so as to return to a position where the axis of the nozzles 31 is directed substantially along the vertical 33 (see FIG. 9).
  • Cleaning liquid sent under pressure by the pumping installation in the conduit 20 enters the bore of the tubular part 30 and via the lumen 47 of the tubular part 30 which is placed in coincidence with the channel 46 'in the cylinder 45; the piston 45 ′ is pushed back by the pressurized liquid in the direction of the support and centering piece 41.
  • the exit of the piston 45 ′ under the effect of the pressurized liquid causes a displacement of the part 41 which engages with a tube 22 of a row of tubes, as shown in FIG. 5.
  • the cooperation of the inclined surfaces of the cavity 41a of the part 41 with the tube produces a slight axial displacement of the ramp 19, so that its position is adjusted extremely precisely relative to the aisles of tubes in which the cleaning is carried out.
  • the part 41 exerts a force on the tube and thus ensures the maintenance of the ramp 19 and of the support 18 during cleaning by the jets of liquid from the nozzles, the forces being taken up by the separation plate 10, via the ramp 19 of the mobile support 18 and of the rail 17.
  • the adapter 48 is produced in the form of an assembly comprising a cylinder 48a fixed on an end part of the ramp 19 and of the support 18 and a piston 48b mounted in the cylinder 48a with a certain latitude of axial movement.
  • the flexible conduit 20 is connected to the end part of the piston 48b produced in a tubular form and mounted leaktight inside the cylinder 48a.
  • the tubular part 30 is integral with a stop ring 49 by means of pins 49 '.
  • the stop ring 49 has a grooved part which is engaged inside a diametrically widened part of the bore of the piston 48b comprising internal grooves corresponding to the grooves of the stop ring 49.
  • the tubular part 30 is integral in rotation with the tubular piston 48b and has a certain latitute of displacement in axial translation relative to the piston 48b.
  • This latitude of axial movement allows the adaptation of the position of the ramp by using the device 41 without exerting push or pull on the conduit 20.
  • tubular part 30 can be rotated about its axis through the conduit 20 and the piston 48b.
  • the tubular piece 30 integral with the ramp 19 moves in the axial direction relative to the conduit 20 and the piston 48b integral with this conduit.
  • the end of the tubular part 30 and the ring 49 move by sliding inside the bore of the piston 48b and the cylinder 48a moves by sliding on the external surface of the piston 48b.
  • the pressurized cleaning fluid supplying the conduit 20 can reach the interior of the bore of the tubular part 30 via the bore of the piston 48b. It is thus possible to supply the nozzles 31 and, via the lights 38a, 38b, 39a, 39b, successive fixed nozzles of the sets of inclined nozzles arranged along elliptical lines.
  • the end of the tubular part 30 opposite the end engaged inside the adaptation device 48 is closed in a leaktight manner by a plug 50 which is fixed inside 'a threaded end portion of the tubular part 30 and which comes to bear via a shoulder 50a and a sealing washer 52, on an end flange of a sleeve 51 bearing on the end of the tubular part 30 and engaged around the external surface of the part 30, with the interposition of a seal 51a.
  • the ends of the tubular part 30 are identical and both comprise a tapped part for the engagement of a closure plug such as the plug 50 and a stop sleeve 49 fixed by screws playing the role of pins.
  • This reversibility of the ramp 19 also makes it possible to successively treat the two parts of the tube plate and the two half-bundles arranged on either side of the separation plate 10 of the steam generator.
  • a flexible rail 17 which is stretched, pressed against the beam separation plate 10 and fixed by its clips, is put in place, through the fist holes located in diametrically opposite positions on the bundle envelope. ends on the outer casing of the steam generator, at the level of the fixing flanges for the closing flaps of the fist holes 14. It is possible, for example, to use clamping plates for the ends of the rail which are fixed and tightened by means of engaged screws in threaded holes of the flanges fixing the taps of the fist holes.
  • the rail is arranged on one side of the separation plate, so that one of the two parts of the tube plate and the lower part of the tubes of the corresponding half-beam can be cleaned.
  • the support 18 of the ramp 19 is engaged on the rail to which is connected, by means of the adapter 48, the displacement and supply duct 20.
  • the conduit 20 is associated with the displacement device 21 comprising a puller-pusher for the displacement of the conduit in the axial direction and a device for alternating rotation in one direction and in the other of the conduit 20 around its axis.
  • the movements in translation and in rotation of the ramp 19 can also be carried out manually.
  • the ramp 19 is moved to a first position which has been identified which corresponds to a position for launching a set of aisles between the tubes 22 of the bundle.
  • Pressure cleaning liquid is sent into the conduit 20 and the tubular part 30 of the nozzle 19 is pivoted, via the conduit 20.
  • the cylinder 45 of the device 40 for precise positioning of the ramp is supplied with liquid under pressure.
  • the piston 45 'and the support and centering piece 41 move in the direction of a tube 22 of the bundle 3, so that the flared surface 41a of the piece support and centering 41 cooperates with the outer surface of the tube to achieve the precise positioning of the ramp 19 in the axial direction.
  • the axial displacement is absorbed by the adaptation device 48, in the manner which has been explained above.
  • the sets of oscillating nozzles 31 and the sets of inclined fixed nozzles 36a, 36b, 37a, 37b are directed into free spaces located above the aisles between the rows of head tubes 23a, 23b and 23c
  • the pivoting of the tubular part 30 makes it possible to carry out the sweeping by the jets formed by the nozzles 31 of three aisles having the direction 23a.
  • the communication of the central bore of the part 30 successively with each of the openings constituting the fixed nozzles arranged on an elliptical line, during the rotation of the tubular part 30, makes it possible to carry out the scanning of two aisles directed in the direction 23b and two aisles directed in direction 23c.
  • the sludge detached from the tube plate and entrained in the peripheral free space 15 of the tube plate is sucked up by the suction device 25.
  • the tubular part 30 comes into contact with the stop 32 which stops the displacement by pivoting of the tubular part 30.
  • the tubular part 30 is then rotated to return it to its initial position, which results in a return to its rest position as shown in FIG. 3 of the device 40 for positioning the ramp 19.
  • the ramp 19 is then again free to move in the axial direction to a new cleaning position.
  • the supply of line 20 with pressurized cleaning liquid is interrupted and the ramp is moved to a new cleaning position.
  • the cleaning device which is taken out of the steam generator is then dismantled, then replaced in the second part of the steam generator, by means of the fist holes, as explained above.
  • the device according to the invention therefore makes it possible to carry out an extremely effective cleaning of the straight paths between the rows of tubes, without the cleaning jets under high pressure striking the tubes of the bundle.
  • the tubes of the two rows located on either side of an aisle simply guide the jet along the length of the aisle.
  • the means for positioning the ramp and the movable support with respect to the tubes of the bundle can be produced in a form different from that which has been described.
  • the support and centering means may for example be fixed relative to the ramp 19 and to the support 18.
  • any number of successive oscillating nozzles can be placed on the ramp, directed in a direction perpendicular to the water course of the steam generator plate and fixed on the pivoting tubular part of the ramp.
  • the displacement in translation and in rotation of the cleaning ramp can be achieved by means different from the supply duct of the ramp.
  • the invention preferably applies to heat exchangers, the tubes of which are arranged in a triangular mesh network but, however, the device according to the invention can also be applied to heat exchangers comprising tubes arranged in a regular network. different from a triangular mesh network.
  • the device according to the invention could be used in the case of a heat exchanger different from a steam generator and having a structure similar to the structure of a pressurized water nuclear reactor steam generator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Thermal Sciences (AREA)
  • Cleaning In General (AREA)
EP95401587A 1994-08-12 1995-06-30 Flüssigkeitsstrahl-Reinigungsvorrichtung für Rohrplatte eines Wärmetauschers und deren Verwendung Withdrawn EP0696719A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9410008 1994-08-12
FR9410008A FR2723634B1 (fr) 1994-08-12 1994-08-12 Dispositif de nettoyage par jet de liquide d'une plaque tubulaire d'un echangeur de chaleur et utilisation.

Publications (1)

Publication Number Publication Date
EP0696719A1 true EP0696719A1 (de) 1996-02-14

Family

ID=9466304

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Application Number Title Priority Date Filing Date
EP95401587A Withdrawn EP0696719A1 (de) 1994-08-12 1995-06-30 Flüssigkeitsstrahl-Reinigungsvorrichtung für Rohrplatte eines Wärmetauschers und deren Verwendung

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Country Link
EP (1) EP0696719A1 (de)
CN (1) CN1083567C (de)
FR (1) FR2723634B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0766040A1 (de) * 1995-09-28 1997-04-02 Thermodyn Vorrichtung zur Reinigung eines Dampferzeugers mit einem Wasserwerfer
FR2761763A1 (fr) * 1997-04-07 1998-10-09 Framatome Sa Dispositif de nettoyage par jets de liquide d'une face d'une plaque tubulaire d'un echangeur de chaleur depuis l'interieur du faisceau de l'echangeur de chaleur
FR2787565A1 (fr) * 1998-12-22 2000-06-23 Framatome Sa Dispositif de nettoyage par jets de liquide d'une plaque tubulaire d'un echangeur de chaleur et en particulier d'un generateur de vapeur
EP3084775A4 (de) * 2013-12-20 2017-11-22 Westinghouse Electric Company Llc Dampferzeuger-schlammlanzen-vorrichtung
WO2023050161A1 (zh) * 2021-09-29 2023-04-06 苏州热工研究院有限公司 适用于蒸汽发生器的多方向射流清洗装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100502514B1 (ko) * 2003-03-04 2005-07-25 정아라 폐열 회수기
DE10357021A1 (de) * 2003-12-05 2005-07-07 Clyde Bergemann Gmbh Kompakter Rußbläser
DE102006041742A1 (de) * 2006-09-04 2008-03-06 Clyde Bergemann Gmbh Vorrichtung zur Reinigung von Hochdruckkesseln
KR101086344B1 (ko) * 2009-07-01 2011-11-23 한전케이피에스 주식회사 증기발생기 2차측 관판 상부의 전열관 다발 틈새 육안 검사 및 이물질 제거장치
CN103353255B (zh) * 2013-06-04 2017-05-10 安徽华速机器人科技有限公司 一种凝汽器在线清洗机器人喷头反锁结构
RU2692748C2 (ru) * 2015-06-10 2019-06-27 Фраматом Гмбх Приспособление и способ для очистки внутренней зоны теплообменника

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084867A1 (de) * 1982-01-25 1983-08-03 Kraftwerk Union Aktiengesellschaft Rohrgassen-Manipulator zum Hochdruck-Abschlämmen von Wärmetauschern
FR2577035A1 (fr) * 1985-02-05 1986-08-08 Thome Emmanuel Outil destine a la destruction des boues formees dans les generateurs de vapeur des reacteurs nucleaires a eau pressurisee
EP0195994A2 (de) * 1985-03-29 1986-10-01 Siemens Aktiengesellschaft Rohrgassen-Manipulator zum Hochdruckabschlämmmen von Wärmetauschern
FR2684482A1 (fr) * 1991-07-05 1993-06-04 Electricite De France Dispositif d'intervention dans un espace delimite par une enveloppe cylindrique comportant au moins deux ouvertures diametralement opposees.
EP0593818A1 (de) * 1990-06-22 1994-04-27 Innus Industrial Nuclear Services S.A. Reinigungsgerät für Dampferzeuger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084867A1 (de) * 1982-01-25 1983-08-03 Kraftwerk Union Aktiengesellschaft Rohrgassen-Manipulator zum Hochdruck-Abschlämmen von Wärmetauschern
FR2577035A1 (fr) * 1985-02-05 1986-08-08 Thome Emmanuel Outil destine a la destruction des boues formees dans les generateurs de vapeur des reacteurs nucleaires a eau pressurisee
EP0195994A2 (de) * 1985-03-29 1986-10-01 Siemens Aktiengesellschaft Rohrgassen-Manipulator zum Hochdruckabschlämmmen von Wärmetauschern
EP0593818A1 (de) * 1990-06-22 1994-04-27 Innus Industrial Nuclear Services S.A. Reinigungsgerät für Dampferzeuger
FR2684482A1 (fr) * 1991-07-05 1993-06-04 Electricite De France Dispositif d'intervention dans un espace delimite par une enveloppe cylindrique comportant au moins deux ouvertures diametralement opposees.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0766040A1 (de) * 1995-09-28 1997-04-02 Thermodyn Vorrichtung zur Reinigung eines Dampferzeugers mit einem Wasserwerfer
FR2761763A1 (fr) * 1997-04-07 1998-10-09 Framatome Sa Dispositif de nettoyage par jets de liquide d'une face d'une plaque tubulaire d'un echangeur de chaleur depuis l'interieur du faisceau de l'echangeur de chaleur
FR2787565A1 (fr) * 1998-12-22 2000-06-23 Framatome Sa Dispositif de nettoyage par jets de liquide d'une plaque tubulaire d'un echangeur de chaleur et en particulier d'un generateur de vapeur
EP3084775A4 (de) * 2013-12-20 2017-11-22 Westinghouse Electric Company Llc Dampferzeuger-schlammlanzen-vorrichtung
US9920925B2 (en) 2013-12-20 2018-03-20 Westinghouse Electric Company Llc Steam generator sludge lance apparatus
US10125976B2 (en) 2013-12-20 2018-11-13 Westinghouse Electric Company Llc Steam generator sludge lance apparatus
WO2023050161A1 (zh) * 2021-09-29 2023-04-06 苏州热工研究院有限公司 适用于蒸汽发生器的多方向射流清洗装置

Also Published As

Publication number Publication date
CN1083567C (zh) 2002-04-24
FR2723634B1 (fr) 1996-10-31
FR2723634A1 (fr) 1996-02-16
CN1126821A (zh) 1996-07-17

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