EP0766040A1 - Vorrichtung zur Reinigung eines Dampferzeugers mit einem Wasserwerfer - Google Patents

Vorrichtung zur Reinigung eines Dampferzeugers mit einem Wasserwerfer Download PDF

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Publication number
EP0766040A1
EP0766040A1 EP96401905A EP96401905A EP0766040A1 EP 0766040 A1 EP0766040 A1 EP 0766040A1 EP 96401905 A EP96401905 A EP 96401905A EP 96401905 A EP96401905 A EP 96401905A EP 0766040 A1 EP0766040 A1 EP 0766040A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
steam generator
launching
block
high pressure
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Withdrawn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
EP96401905A
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English (en)
French (fr)
Inventor
George V. Owen
Scott M. Theiss
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 EP0766040A1 publication Critical patent/EP0766040A1/de
Withdrawn legal-status Critical Current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 present invention relates, in general, to equipment intended for cleaning steam generators and, more particularly, to a washing system using a lance using a jet of fluid under high pressure, for cleaning the mud from the tubular plates and steam generator tubes.
  • steam generators are used to exchange heat from the primary side to the secondary side to produce steam to power the turbines.
  • a primary fluid which is heated by the core of the nuclear reactor is forced through a set or bundle of tubes in the steam generator.
  • a secondary fluid usually water, is conducted into the space around the tubes, thereby providing a continuous cycle of steam production.
  • a sludge consisting mainly of iron oxides, such as magnetite, forms on the lower outer part of the tubes and on the tube plates which support the tube bundle. Because the formation of mud on the tube bundle and on a tube plate reduces the efficiency of heat transfer and may cause corrosion, it is best if the tubes and tubular plates are cleaned periodically to remove mud.
  • a conventional launch consists in using segmented lances, usually screwed together, which are moved through the bundle of tubes by an indexer mounted outside.
  • the operation of these lances requires that lance sections be removed or added when the lances are removed or advanced. Adding or removing lance sections requires that the launching operation be stopped and further requires the presence of personnel in a radioactive area.
  • adding and removing sections of lance involves at least half the time planned for the operation. This leads to increased exposure of personnel to radiation and unproductive downtime of the nuclear steam system.
  • US-A-4,079,701 describes a system for removing sludge from a steam generator, in which barrels are arranged directly above the sludge to be removed and a fluid jet lance is moved along the line between the barrels.
  • US-A-4,424,769 discloses an apparatus for removing mud deposits from the tube plates of a steam generator, in which a set of lances is moved into and through the steam generator by a control mechanism. A cleaning is carried out in successive sequences with different lances which direct a cleaning fluid towards the tube plate in different areas increasingly distant from the lances.
  • U.S. Patent 4,515,747 describes a wheeled transport vehicle that is pulled by cables along the tube plate between the tube bundle and the enclosure of the steam generator. Control equipment or a nozzle for cleaning the tube plate can be attached to the transport unit.
  • U.S. Patent 4,566,406 describes a steam generator having a manifold having a plurality of nozzles for cleaning the sludge from the tube plate.
  • the manifold is rigidly attached to the tube plate and remains in place during normal operation of the steam generator.
  • U.S. Patent A-4,700,662 describes a lance for cleaning direct flow steam generators.
  • a curved high pressure fluid supply tube has a plurality of supply tube extensions attached at one end and a nozzle holder attached at the other end.
  • a second nozzle holder, bolted to the first maintains the throwing blocks in position between the two nozzle holders.
  • the launching blocks are in fluid communication with the first nozzle holder and are provided with diffusion openings having a certain angle for cleaning the tubes positioned in a triangular pitch in a direct passage steam generator.
  • US-A-4,757,785 describes an apparatus for eliminating sludge from a steam generator in which a guide slide is mounted between the outer casing of the direct passage steam generator and the circular casing, located around the bundle of tubes.
  • a motorized transport element driven on the slide directs a fluid under high pressure towards a bundle of tubes through windows located in the circular protective envelope.
  • U.S.-A-5,320,072 issued to Theiss et al., Describes an apparatus for removing mud from tubes and the tube plate of a steam generator.
  • a support structure is mounted on an access port of a steam generator and a lance extends from the support structure in the steam generator.
  • a drum is attached to a high pressure hose connected to the lance.
  • a set of driving rollers, mounted on the support structure, is used to move the cylinder through the lance tube. High pressure water flows through slots in the drum and through outlet holes in the lance tube against the tubes and the tube plate.
  • a tilt motor causes the lance to rotate back and forth and to the front to create a sweep action.
  • the present invention relates to a jet launch system for a steam generator for cleaning tubes and tubular plates of a steam generator.
  • the jet launch system includes a launch block including at least one nozzle adapted for fluid communication with a high pressure hose.
  • the launching block comprises: a structure; a throwing body mounted in the structure for rotation relative to the structure about a tilt axis, the nozzle body including an inlet which can be connected to the high pressure hose for communication of fluid therebetween; and a nozzle mounted in the launching body, the nozzle being in fluid communication with the inlet.
  • the jet launch system also includes support means comprising a transport member for transporting the launch block through the generator. steam and an operational control system to selectively position the nozzle in relation to the tubes and tubular plates of the steam generator.
  • the control system comprises a chain fixed to the transport element and indexing means including an operational computer for measuring the length of the chain extended in the steam generator and for automatically positioning the launching block relative to the tubes.
  • the indexing means include an indexing engine; indexing link means between the indexing motor and the chain; an encoder for generating a signal corresponding to a prescribed length of the chain in extension in the steam generator.
  • the jet launching system includes tilting means that can be actuated to rotate the nozzle around a tilting axis.
  • an aspect of the present invention is to provide a lance system for cleaning tubes and tubular plates of a steam generator.
  • the launch system includes: (a) a launch block including at least one nozzle adapted for fluid communication with a high pressure hose; (b) support means including a transport element for transporting the launch block through the steam generator; and (c) an operational control system for selectively positioning the nozzle relative to the tubes and tubular plates in the steam generator.
  • the launch block includes: (a) a structure; (b) a throwing body mounted in the structure for rotation relative to the structure about a tilt axis, the throwing body including an inlet which can be connected to the high pressure hose to establish a fluid connection therebetween ; and (c) a nozzle mounted in the launching body, the nozzle being in fluid communication with the inlet.
  • the launch system includes: (a) a launch block including at least one nozzle adapted for fluid communication with a high pressure hose, the launch block comprising: (i) a structure, (ii) a mounted launch body in the structure for rotation relative to the structure about a tilting axis, the throwing body including an inlet which can be connected to the high pressure pipe to establish a communication of fluid between them; and (iii) a nozzle mounted in the launching body, the nozzle being in fluid communication with the inlet; (b) support means including a transport element for transporting the launch block through the steam generator; (c) an operational control system for selectively positioning the nozzle relative to the tubes and tubular plates of the steam generator; and (d) actuating tilting means for rotating the nozzle about a tilting axis.
  • a launching system produced according to the present invention is suitable for cleaning the tubes 20 and the tubular plates of a steam generator 15 using a "de inside to outside ".
  • Selectively positioned fluid jets are provided in the tubeless passage 30 of the steam generator. The jets release the mud from the tubes and tubular plates and direct this mud towards the annular space 16 of the steam generator.
  • the mud can be removed from the annular space 16 by any appropriate means such as, for example, by suction (not shown).
  • the launching system 10 comprises, according to the preferred mode, a right set 11 and a left set 12.
  • the right and left sets 11, 12 are symmetrical to each other and, alone, the Right set 11 will be discussed below, since the description of the right set 11 also applies to the left set 12.
  • the launching system 10 comprises a guide slide 420 which extends along the passage without tube 30.
  • the transport element 400 is positioned along the guide slide 420 by a chain 506 and an adjustment device 510.
  • One of the launching blocks, 100, 200, 300, is mounted on the transport element 400.
  • the launching block comprises a plurality of nozzles which direct jets of high pressure fluid between respective rows of tubes 20, along a prescribed angle to the length of the guide rail.
  • FIG. 1 shows the preferred angles of the respective fluid jets 130, 230, 330 of the launching blocks 100, 200, 300.
  • the transport element is provided with a tilting assembly 450 which is used to tilt or rotate the nozzles about an axis essentially parallel to the length of the slide 420.
  • the rocking movement serves to direct the jets of fluid to high pressure up and down the length of the tubes and directly on the tube plates. In particular, this action serves to detach and evacuate the sludge and deposits collected at the junction of the tubes and tubular plates.
  • the guide slide 420 is mounted, by means of a mounting support, on one or two inspection holes 22 situated on the passage without tube 30 of the steam generator 15. As shown in FIG. 2, the slide guide 420 includes a longitudinal slot 421 extending along the slide.
  • a transport element 400 is mounted in the guide rail 420 by means of a T-shaped sliding mount 404.
  • the rollers 404a facilitate the movement of the transport element 400 along of the guide rail 420.
  • the transport element 400 comprises a camera 412, a conduit 402, and a tilting compressed air motor 452.
  • the camera 412 can also be a proximity sensor.
  • the conduit 402 is adapted to connect to a high pressure hose 422 by means of a connector 406.
  • the transport element 400 is coupled to a rigid chain 506 by a coupling element 410.
  • the rigid advancement chain 506 is , preferably, contained in the slot 421 of the guide slide 420.
  • the launch block 300 is adapted to provide a fluid jet 330 consisting of four substantially parallel jets.
  • the jet 330 is directed at an angle of 150 ° relative to the slide 420.
  • the angle of the jets relative to the rows of tubes is shown in FIG. 2a.
  • the launching block 300 is shown in exploded view with the transport element 400.
  • the launching block 300 comprises a front structural block 306 and a rear structural block 308.
  • the body of launch 302 is mounted between the structural blocks 306, 308 by means of bearings 454 allowing rotation around a axis parallel to the length of the slide 420.
  • a plurality of nozzles 310 is mounted in the throwing body 302 so that they can pivot in the plane defined by the lengths of the tubes 20.
  • a guide 312 is fixed to the structural blocks 306, 308 and comprises guide slots 312a in which the nozzles 310 are received.
  • the guide slots 312a are aligned parallel to the tubes of the steam generator.
  • an air motor 452 is supplied with air supplied under pressure through an air duct 452a and is controlled by means of an electromagnetic air valve 452b.
  • the air motor 452 When the air motor 452 is activated, its rotational force is transformed into an oscillation of the launching body 302 by means of a connection system 456.
  • the launching body 302 rotates around the bearings 454 over a range of approximately 80 °, so that the jets of fluid sweep the tubular plates and the lengths of tubes.
  • the realization of vertical guide slots 312a and the pivoting mounting of the nozzles 310 on the launching body 302 allow the nozzles 310 to be turned up and down around an axis parallel to the length of the slide 420 and, more particularly, around an axis perpendicular to the tilt axis.
  • the ends of the nozzles 310 move in machined slots 312a, located in guide 312, thus limiting their direction to the plane created by their respective row of tubes.
  • the launch block 200 is shown there.
  • the elements 202, 206, 208, 208a, 210, 212 and 212a correspond respectively to the elements 302, 306, 308, 308a, 310, 312 and 312a of the launching block 300, except that the nozzles 210 are placed by the guide slots 212a at an angle of approximately 30 ° relative to the guide rail 420, thus providing a jet of fluid 230, as shown in FIG. 1.
  • the angle of the jets of fluid with respect to the rows of tubes is shown in the Figure 3a.
  • a launch block 100 is shown there.
  • the elements 102, 106, 108 and 108a correspond respectively to the elements 302, 306, 308 and 308a of the launching block 300.
  • the launching block 100 comprises pierced nozzles 110 perpendicular to the tilting axis.
  • the nozzles 110 provide jets of fluid 130 as shown in Figure 1.
  • the angle of the jets relative to the rows of tubes is shown in Figure 4A.
  • the transport element 400 and each of the launch blocks 100, 200, 300 are adapted in a cooperative manner, so that each of the launch blocks can be selectively fixed and detached from the transport element 400, providing interchangeability of launching blocks.
  • the three different launching blocks 100, 200, 300 can be interchanged without disconnecting any of the supply lines or the connecting devices.
  • the launching blocks and the transport elements can be coupled by screwed fasteners, inserted inside the diffuser body.
  • Camera 412 records the water jets during operation and is used to initially align the jets with the rows of tubes.
  • an adjustment device 510 and a computer 502 serve to precisely position the nozzles with respect to the rows of tubes.
  • the adjuster 510 uses an electric motor 516, preferably a DC motor, to drive the chain 506 (omitted in Figure 6 for clarity) in and out of the slide 420 via a chain sprocket 514.
  • the control computers 502 control the activation and deactivation of the electric motor 516, which, in turn, controls the chain sprocket 514 by means of the gears 516a, 518.
  • An optical encoder measures the rotation of the pinion 514 and transmits the information to the control computer 502 via a harness of control cables 504.
  • the control computer 502 calculates the position of the transport element 400 inside the steam generator 15. Once the operator aligns the nozzles in a first series of rows of tubes using the camera 412, the control computer 502 automatically moves the transport element 400 to the next row for each setting.
  • High pressure water, air and a video signal are transmitted and received from the respective launch block by a bundle of pipes 422.
  • the excess chain is kept in a chain storage box 520 (mounted on the adjustment device 510) where it remains until the throwing block is pushed further into the steam generator.
  • the hose reel 424 preferably spring loaded, stores the hose bundle 422 until a hose is needed inside the generator.
  • the excess chain is wound on the housing and the hose reel winds the excess pipes and cables, thereby maintaining the cable bundle in constant tension. This eliminates the necessary presence of a supervisor during operation, thereby reducing the dose of radiation.
  • the mounting slide is assembled via a mounting bracket on one or two inspection holes 22, located on a row without tube 30 of the generator 15.
  • High pressure water , supply air for the rocking motor 452 and video lines are hooked to the appropriate launching block 100, 200, 300, then the transport element carrying the launching block is loaded into the guide slide 420
  • the rigid chain 506 is then connected to the transport element.
  • the adjustment device 510 is then mounted on the steam generator 15.
  • the operator can block and unlock the tilting motor 432 using an electromagnetic air valve 452b, move the throwing block through the generator, align the nozzles with the rows of tubes, supply high pressure water to the nozzles and control the jet emission process using the camera on board.
  • each of these operations can be carried out independently for each of the right 11 and left 12 sets.
  • the launching system 10 washes from the inside to the outside, spraying constantly in four rows, but adjusting only one row at a time. That does not allow mud to migrate back to clean areas because there are no longer long breaks in the setting process.
  • the operator linearly aligns the nozzles once, and observes the monitor each time the computer automatically focuses. Once the guide rail is in place and alignment is established, the operator has very little to do to keep the system in operation. This leads to a significant reduction in the time required to lance the steam generator and, thereby, a significant reduction in the overall downtime of the reactor due to the cleaning process.
  • the motor 452 tilts the nozzles approximately 80 °, which cleans the tube plate in a sweeping movement, causing the mud to wash out of the annular space of the generator where the collectors are located by suction.
  • the height and angle of the nozzles are permanently adjusted according to the geometry of the generator itself.
  • the launching system 10 provides several important advantages.
  • the supply of three different launching blocks 100, 200, 300, such that the fluid jets are directed at different angles with respect to the rows of tubes, and the contribution of the tilting function such that each nozzle pivots upwards and downwards of approximately 80 °, provides a washing system with a predirectional lance of the tube plate. Because each launch block contains four nozzles, four rows of adjacent tubes can be washed at the same time. In addition, if a left set and a right set are used in tandem, both the hot leg and the cold leg can be washed at the same time. After an initial setting, an operator is only required at the generator level for rapid nozzle changes, thereby lowering the radiation dose.
  • the use of a rigid slide to guide the nozzle and the transport element through the generator provides certain advantages.
  • the guide rail withstands the strong reaction of the nozzles and limits the movement of the nozzles to one direction. As a result, the alignment of the nozzles is one-dimensional.
  • a transport element containing nozzles can move slowly along the passage without a tube and wash the tubular plates with a lance.
  • the launch block can be rigidly supported by a cantilever post and thus be inserted into the generator. The launching block would then be adjusted and tilted by the upright using an adjustment device placed outside.
  • a beam lance washing technique can be used.
  • the chain can also consist of an endless timing belt and a pulley.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cleaning In General (AREA)
EP96401905A 1995-09-28 1996-09-05 Vorrichtung zur Reinigung eines Dampferzeugers mit einem Wasserwerfer Withdrawn EP0766040A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/535,570 US5813370A (en) 1995-09-28 1995-09-28 Steam generator lancing system
US535570 1995-09-28

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EP0766040A1 true EP0766040A1 (de) 1997-04-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3454002A1 (de) * 2017-09-08 2019-03-13 BWXT Nuclear Energy, Inc. Mehrfachwinkelschlammlanze

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WO1996038702A1 (de) * 1995-05-30 1996-12-05 Clyde Bergemann Gmbh Antriebssystem für wasserlanzenbläser mit gehäuse für sperr- und spülmedium und verfahren zum betrieb
US6462568B1 (en) 2000-08-31 2002-10-08 Micron Technology, Inc. Conductive polymer contact system and test method for semiconductor components
US7162981B2 (en) * 2005-03-16 2007-01-16 Framatome Anp, Inc. System for annulus tooling alignment with suction pickup in the stay dome on the secondary side of a steam generator
KR100621837B1 (ko) * 2005-05-27 2006-09-19 한국전력공사 고압수 분사방식을 이용한 증기발생기 세정장치
DE102006005012A1 (de) * 2006-02-03 2007-08-09 Clyde Bergemann Gmbh Vorrichtung mit Fluidverteiler und Messwerterfassung sowie Verfahren zum Betrieb eines mit Rauchgas durchströmten Kessels
US7464670B2 (en) * 2006-07-26 2008-12-16 Framatome Anp, Inc. System for cleaning, inspection and tooling delivery in the secondary side of a steam generator
US8238510B2 (en) * 2007-07-03 2012-08-07 Westinghouse Electric Company Llc Steam generator dual head sludge lance and process lancing system
US20090211612A1 (en) * 2008-01-08 2009-08-27 Christos Athanassiu Super-thin water jetting lance
US20150027499A1 (en) * 2013-07-24 2015-01-29 Babcock & Wilcox Nuclear Energy, Inc. Multi-angle sludge lance
US9939215B2 (en) * 2013-09-06 2018-04-10 Nlb Corp. Automated cleaning system
US9400145B2 (en) 2014-07-25 2016-07-26 Stoneage, Inc. Flexible multi-tube cleaning lance positioner guide apparatus

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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.
EP0636834A1 (de) * 1993-07-27 1995-02-01 SRA SAVAC, Société Anonyme dite : Verfahren und Vorrichtung zur Reinigung eines Dampferzeugers mit einem Wasserwerfer
EP0696719A1 (de) * 1994-08-12 1996-02-14 Framatome Flüssigkeitsstrahl-Reinigungsvorrichtung für Rohrplatte eines Wärmetauschers und deren Verwendung

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Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
WO1990007679A1 (en) * 1986-07-29 1990-07-12 Carlo Smet Arrangement for cleaning a steam generator with a water jet
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.
EP0636834A1 (de) * 1993-07-27 1995-02-01 SRA SAVAC, Société Anonyme dite : Verfahren und Vorrichtung zur Reinigung eines Dampferzeugers mit einem Wasserwerfer
EP0696719A1 (de) * 1994-08-12 1996-02-14 Framatome Flüssigkeitsstrahl-Reinigungsvorrichtung für Rohrplatte eines Wärmetauschers und deren Verwendung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3454002A1 (de) * 2017-09-08 2019-03-13 BWXT Nuclear Energy, Inc. Mehrfachwinkelschlammlanze
US10393367B2 (en) 2017-09-08 2019-08-27 Bwxt Nuclear Energy, Inc. Multi-angle sludge lance

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