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EP0067739B1 - Verfahren und Vorrichtung zum Entfernen von Schlamm von der Oberfläche des Rohrbodens eines Dampferzeugers - Google Patents

Verfahren und Vorrichtung zum Entfernen von Schlamm von der Oberfläche des Rohrbodens eines Dampferzeugers Download PDF

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Publication number
EP0067739B1
EP0067739B1 EP82400930A EP82400930A EP0067739B1 EP 0067739 B1 EP0067739 B1 EP 0067739B1 EP 82400930 A EP82400930 A EP 82400930A EP 82400930 A EP82400930 A EP 82400930A EP 0067739 B1 EP0067739 B1 EP 0067739B1
Authority
EP
European Patent Office
Prior art keywords
steam generator
tube plate
tubes
tube
sludge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82400930A
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English (en)
French (fr)
Other versions
EP0067739A1 (de
Inventor
Jean-Claude Yazidjian
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
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Filing date
Publication date
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0067739A1 publication Critical patent/EP0067739A1/de
Application granted granted Critical
Publication of EP0067739B1 publication Critical patent/EP0067739B1/de
Expired 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
    • F28G3/00—Rotary appliances
    • F28G3/16—Rotary appliances using jets of fluid for removing debris
    • 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 or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/483—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers specially adapted for nuclear steam generators

Definitions

  • the present invention relates to a method and a device for unclogging the upper face of the tube plate of a steam generator.
  • the steam generators of pressurized water nuclear reactors generally comprise a cylindrical envelope of great height inside which is disposed vertically a bundle composed of a large number of bent tubes in the shape of an inverted U. Each tube is connected by its two ends to a tubular plate arranged horizontally in the vicinity of the lower part of the steam generators, above the lower curved bottom of this generator.
  • the lower part of the steam generator located under the tube plate forms two substantially identical compartments delimited by the lower curved bottom and by a vertical partition, one of the compartments communicates by the tube plate with one of the ends of all the tubes, the other compartment communicates with the other end of all the tubes.
  • the pressurized water bringing the heat from the core of the nuclear reactor to the steam generator is introduced into one of the compartments, circulates in the tubes, returns to the other compartment and returns to the core of the nuclear reactor. Passing through the tubes, this water gives up part of its heat by vaporizing food water which is contained in the envelope of the generator and which surrounds the tubes.
  • the steam produced is taken from the upper part of the steam generator and sent to the turbine associated with the electric generator. This vapor is then condensed in the form of drinking water, which is reintroduced into the steam generator.
  • This sludge is mainly composed of iron oxide, in particular magnetite, which is the cause of corrosion phenomena in the tubes at the level of the tube plate.
  • iron oxide in particular magnetite
  • This sludge is mainly composed of iron oxide, in particular magnetite, which is the cause of corrosion phenomena in the tubes at the level of the tube plate.
  • a common point in these unclogging methods is to launch the cleaning water using a single launching head which moves either along a diameter of the steam generator, or along 'a radius of this generator.
  • the cleaning operation is carried out in two stages: introduction of the lance through an orifice formed in the envelope of the steam generator and cleaning of the corresponding tubular half-plate, then introduction through a diametrically opposite orifice and cleaning the other tubular half-plate.
  • the present invention relates to a method and a unclogging device intended to overcome these various drawbacks.
  • the present invention therefore relates to a method of unclogging the upper face of the tube plate of a steam generator comprising, in a cylindrical enclosure with vertical axis, a vertical bundle of bent tubes in the shape of an inverted U, connected to each of their ends lower than the flat horizontal tubular plate integral with the enclosure of the steam generator, a high temperature fluid being brought to the tubes of the bundle above the tubular plate to supply heat allowing the vaporization of the drinking water introduced into the steam generator.
  • the launching heads are movable in a diametrical direction of the steam generator located in the free space left between the bundle of tubes; and means are provided for simultaneous displacement of the two launching heads so that their position always remains symmetrical with respect to the central axis of the steam generator in order to symmetrically sweep the entire tubular plate.
  • a sludge evacuation device consisting of at least one tube situated above the tubular plate, at a relatively small distance, and disposed at the periphery of the tubular plate, in the vicinity of the vertical cylindrical envelope of the steam generator, this tube comprising orifices directed towards the bottom of the steam generator, and at least one connection of this evacuation tube to a conduit opening out of the steam generator and connected to a suction device.
  • a steam generator in fig. 1, the entire lower part of a steam generator is seen, consisting essentially of an external cylindrical envelope 1 arranged vertically, closed downwards by a plate 2 arranged horizontally, under this plate is an envelope in the form of a hemisphere 3 comprising a vertical watertight partition 4 which thus delimits two chambers 5, 6; the horizontal plate 2 comprises a series of pipes 7 which pass through it and which are sealed to it. Each of these pipes 7 is in the form of an inverted U, the two lower ends of which each open into one and the other of the chambers 5, 6.
  • the steam generator works as follows: hot water from the reactor core is introduced into chamber 6, passes through all of the tubes 7, leaves in chamber 5, then returns to the reactor core. When passing through the tubes 7, this hot water gives up its heat to a food water contained in the chamber 8, by transforming this food water into steam which rises towards the upper part of the steam generator and which is sent to the turbines. In normal operation of the generator, there is a long-term deposit of sludge on the upper face 9 of the tubular plate 2.
  • This steam generator further comprises a set of devices for cleaning the sludge on the upper face of the tube plate 2, which we will describe in more detail below.
  • the unclogging principle adopted in the present invention is illustrated by schematic figure 2.
  • the tubular plate 2 on which tubes are fixed vertically 7, all these tubes being arranged equidistant so as to form a tube bundle.
  • This tubular bundle extends in the major part of the tubular plate 2 but does not however extend to the very center of this tubular plate.
  • the tubes 7 'closest to the central axis 10 are indeed at a certain distance, in order to respect the minimum radius of curvature of their U shape.
  • the launching heads 11 and 12 In the vicinity of the central axis 10, there is therefore a region devoid of tubes, in which are arranged the launching heads 11 and 12.
  • FIG. 2 we distinguish the launching head 11 supplied with water under high pressure, and comprising a series of nozzles.
  • the launching head is driven in an oscillating movement around the longitudinal axis of the lances, so that the water jets represented by the arrow 13 cover the entire surface of the tubular plate.
  • the water jets which follow direction 13 lie in a vertical plane which is perpendicular to the longitudinal axis of the lances 11, 12.
  • a displacement along the longitudinal axis 14 of the lances 11 allows these water jets to reach all of the connection points between the tubes 7 and the tube plate 2.
  • the rods 19, 20 are fully inserted into the steam generator so that the launching heads 11, 12 are almost contiguous at the center of the steam generator. At this time it is sent into the rods 19, 20 the water under high pressure which emerges at the launching heads in the form of jets perpendicular to the axis 14. As the tubes are arranged at the tubular plate in regular grids, the water jets can pass between the rows of tubes and thus reach, due to the oscillating movement of the heads, the different zones of the tube plate being on a line perpendicular to the axis 14.
  • the rods 19, 20 are moved simultaneously towards the outside of the steam generator by a distance equal to the distance which separates two rows of consecutive tubes. Successive movements are thus carried out so that the unclogging operation ends when the two launching heads 11, 12 arrive simultaneously at the peripheral zone of the tubular plate. By proceeding in this way, the sludge detached during the passage of a jet of water does not circulate on the tubular plate so as to return to an already cleaned zone to redeposit there.
  • the complete unclogging operation cannot stop when the sludge is removed, but must simultaneously include an operation for removing the sludge mixed with the water coming from the launching heads.
  • this tube 21 is arranged above the tube plate 2, at a small and regular distance from this plate.
  • a row 22 of holes is arranged, arranged longitudinally at the bottom of the tube, which also corresponds to the zone of the tube closest to the tube plate 2.
  • the tube 21 is mounted and fixed permanently inside the steam generator.
  • the tube 21 is formed of several sections, 6 in number, closed at the ends, each section 21, 21 'comprising communication with the outside of the independent generator.
  • a set of pipes brings together, by pipes 27, 27 ' each tube 21, 21' to a suction device with interposition of a valve on each of the pipes, which allows, by the different setting of each valve, to locally increase the suction capacities in order to obtain good evacuation of the sludge over the entire periphery of the tube plate.
  • Fig. 5 shows a launching head which includes two pairs of spears 29, 29 'and 30.30'.
  • the first pair of lances 29, 29 ' being arranged in a first plane perpendicular to the axis 14 and the second pair of lances 30, 30' being arranged in a second plane perpendicular to the axis 14, the distance separating the lances 29 and 30 being equal to the distance between two consecutive rows of tubes constituting the bundle of tubes.
  • each lance unclogs by simultaneously sending two jets on either side of the same tube, which causes a highly effective cleaning.
  • the lances 29 and 29 ' are arranged diametrically opposite with respect to the axis 14. The same is true of the lances 30 and 30'.
  • This arrangement has the advantage of causing the cancellation of the reaction forces at the level of the launching heads, which allows a lighter and more reliable construction of the rods which support these launching heads.
  • the unclogging method or device specific to our invention improves the performance of the sludge recovery operation since, due to the symmetrical action of the two heads, the jets move the sludge not only in the direction of the jets but also in a perpendicular direction. Thus, the sludge is pushed back step by step towards areas of higher transparency of the beam, that is to say areas where the number of rows of tubes is lower, areas for which the launching efficiency is increased. .
  • the device specific to our invention makes it possible to minimize the number of removable parts located inside the steam generator, which simplifies the operating mode, saves time and reduces the risks of having to recover. elements inside the steam generator in the event of an incident.
  • the fact of having only the lances to be introduced inside the steam generator makes it possible to use access holes of small diameter.
  • the device specific to our invention also makes it possible, during the period of operation of the steam generator, to operate the sludge removal device permanently mounted inside the steam generator, in order to carry out the periodic purging operations of potable water, which limits the deposition of sludge and consequently lengthens the period between two unclogging operations, which always require stopping the operation of the steam generator.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cleaning In General (AREA)
  • Paper (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Claims (6)

1. Verfahren zum Entschlammen der Oberfläche (9) der Rohrplatte (2) eines Dampferzeugers, welcher in einem Zylindermantel mit senkrechter Achse ein senkrechtes Bündel umgekehrt U-förmig gebogener Rohre (7) aufweist, die jeweils mit ihren unteren Enden an der mit dem Dampferzeugermantel fest verbundenen ebenen Horizontal-Rohrplatte angeschlossen sind, wobei zur Wärmeabgabe ein Hochtemperaturmedium den Rohren des Bündels unter der Rohrplatte zugeführt wird, wodurch in den Dampferzeuger eingeführtes Speisewasser bei Berührung der Rohre verdampft werden kann, dadurch gekennzeichnet, dass ein Vorgang zum Ablösen der Schlämme durch Anordnung von zwei zu verschiedenen Rohrplattenstellen hin richtbaren Hochdruckwasserstrahlen (13) in dem das Rohrbündel aufnehmenden Mantel vorgesehen ist, wobei ein Wasserstrahl die erste Hälfte einer scheibenförmigen Zone der Rohrplatte überspült und der andere Wasserstrahl die weitere Hälfte der scheibenförmigen Zone der Rohrplatte überspült, wobei diese beiden Wasserstrahlen gleichzeitig und symmetrisch zu der Durchmessertrennlinie der beiden Rohrplattenzonen verschoben werden, und diese Verschiebung ausgehend von dieser Durchmesserlinie zu der Dampferzeugerperipherie hin erfolgt, und dass gleichzeitig ein Vorgang zur Beseitigung der durch die Wasserstrahlen abgelösten Schlämme vorgesehen ist, in dem eine Absaugung dieser Schlämme entlang der Umfangszone der Rohrplatte stattfindet.
2. Vorrichtung zum Entschlammen der Oberfläche (9) der Rohrplatte (2) eines Dampferzeugers, welcher in einem Zylindermantel mit senkrechter Achse ein senkrechtes Bündel umgekehrt U-förmig gebogener Rohre (7) aufweist, die jeweils mit ihren unteren Enden an der mit dem Dampferzeugermangel fest verbundenen ebenen Horizontal-Rohrplatte angeschlossen sind, wobei zur Wärmeabgabe ein Hochtemperaturmedium den Rohren des Bündels unter der Rohrplatte zugeführt wird, wodurch in den Dampferzeuger eingeführtes Speisewasser bei Berührung der Rohre verdampft werden kann, dadurch gekennzeichnet, dass sie zwei Spülköpfe (11, 12) aufweist, die Hochdruckwasser in Richtung der Rohrplatte spritzen, wobei diese beiden Köpfe unabhängig voneinander entlang derselben über der Rohrplatte liegenden horizontalen Achse (14) verfahren werden und um diese Achse eine Pendelbewegung ausführen, wobei die Verschiebung der Köpfe schrittweise um eine Grösse erfolgt, die dem Abstand zwischen zwei Reihen Rohre (7) entspricht, so dass die aus den Lanzen strömenden Wasserstrahlen (13) nacheinander zwischen jeder Reihe Rohre (7) durchfliessen.
3. Entschlammvorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Spülköpfe gemäss einer diametralen Richtung (14) des Dampferzeugers verschiebbar sind, die in dem zwischen dem Bündel Rohre (7) freigelassenen Raum liegt, und dass Mittel zum gleichzeitigen Verfahren der beiden Spülköpfe vorgesehen sind, damit deren Lage stets symmetrisch zur Dampferzeuger-Mittelachse bleibt, um eine symmetrische Spülung der gesamten Rohrplatte zu gewährleisten.
4. Entschlammvorrichtung nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass die Vorrichtung zur Beseitigung der Schlämme (24) aus mindestens einem Rohr (21) besteht, das mit einem verhältnismässig geringen Abstand über der Rohrplatte liegt und an der Peripherie der Rohrplatte (2) in der Nähe des senkrechten Dampferzeuger-Zylindermantels (1) angeordnet ist, wobei dieses Rohr Öffnungen (22) aufweist, welche nach unten hin in dem Dampferzeuger gerichtet sind, und mindestens eine Abzweigung (25, 26) von diesem sich in eine Leitung (27) entleerendes Rohr nach aussen aus dem Dampferzeuger mündet, und an eine Saugvorrichtung angeschlossen ist.
5. Entschlammvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Rohr zur Beseitigung der Schlämme aus mehreren unabhängigen, aufeinanderfolgenden, an jedem Ende verschlossenen Abschnitte (21') besteht, wobei jeder Abschnitt an eine Saugvorrichtung über eine getrennte Leitung (27) mit einem Schieber angeschlossen ist, wobei zur örtlichen Erhöhung der Saugleistungen diese Schieber unterschiedlich geregelt werden können.
6. Entschlammvorrichtung nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass die Vorrichtung zur Beseitigung der Schlämme eine vereinfachte Vorrichtung mit nur einer Reihe Löcher (28) ist, die an der Peripherie der Rohrplatte liegen und ausserhalb des Dampferzeugers an eine Saugvorrichtung angeschlossen sind.
EP82400930A 1981-05-22 1982-05-19 Verfahren und Vorrichtung zum Entfernen von Schlamm von der Oberfläche des Rohrbodens eines Dampferzeugers Expired EP0067739B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8110204 1981-05-22
FR8110204A FR2506428A1 (fr) 1981-05-22 1981-05-22 Procede et dispositif de decolmatage de la face superieure de la plaque tubulaire d'un generateur de vapeur

Publications (2)

Publication Number Publication Date
EP0067739A1 EP0067739A1 (de) 1982-12-22
EP0067739B1 true EP0067739B1 (de) 1984-01-04

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Family Applications (1)

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EP82400930A Expired EP0067739B1 (de) 1981-05-22 1982-05-19 Verfahren und Vorrichtung zum Entfernen von Schlamm von der Oberfläche des Rohrbodens eines Dampferzeugers

Country Status (7)

Country Link
US (1) US4452183A (de)
EP (1) EP0067739B1 (de)
JP (1) JPS57198899A (de)
KR (1) KR830010368A (de)
DE (1) DE3260028D1 (de)
ES (1) ES512429A0 (de)
FR (1) FR2506428A1 (de)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4566406A (en) * 1983-07-13 1986-01-28 Westinghouse Electric Corp. Sludge removing apparatus for a steam generator
JPS6035300U (ja) * 1983-08-19 1985-03-11 三菱重工業株式会社 清掃装置
US4769085A (en) * 1983-08-26 1988-09-06 Innus Industrial Nuclear Services S.A. Method for cleaning a steam generator
US4620881A (en) * 1983-08-26 1986-11-04 Innus Industrial Nuclear Services S.A. Method for cleaning a steam generator
FR2558747B1 (fr) * 1984-01-27 1986-07-25 Innus Ind Nuclear Service Procede de nettoyage sous haute pression d'un evaporateur et installation utilisee dans ce but
US4526135A (en) * 1984-02-03 1985-07-02 Westinghouse Electric Corp. Eddy current workpiece positioning apparatus
US4632068A (en) * 1984-05-24 1986-12-30 Westinghouse Electric Corp. Modular sludge collection system for a nuclear steam generator
US4705575A (en) * 1985-03-12 1987-11-10 Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung Process and arrangement for separating ceramic nuclear fuels from metallic casing or support members
JPH0737199B2 (ja) * 1985-04-02 1995-04-26 株式会社ジェイエスイー 表面の付着物除去方法
US4583496A (en) * 1985-04-19 1986-04-22 Bergemann Gmbh Soot blower
US4848278A (en) * 1985-11-26 1989-07-18 Apex Technologies, Inc. Nuclear steam generator sludge lancing method and apparatus
DE3633980C1 (de) * 1986-10-06 1987-08-27 Bergemann Gmbh Vorrichtung zum Abdichten von zurueckziehbaren Russblaeserlanzen
DE3812533A1 (de) * 1988-04-15 1989-10-26 Josef Seelen Abdichtung fuer blasrohr oder welle
US4972804A (en) * 1989-04-25 1990-11-27 Alexander T. Kindling Method and apparatus for organizing the flow of fluid in a vertical steam generator
US5088451A (en) * 1990-04-09 1992-02-18 Westinghouse Electric Corp. Sludge removal system for removing sludge from heat exchangers
FR2665240A1 (fr) * 1990-07-26 1992-01-31 Assainissement Ste Regionale Procede et dispositif pour l'evacuation des boues et de l'eau de lavage a l'interieur d'un generateur de vapeur.
JP3073261B2 (ja) * 1991-06-03 2000-08-07 株式会社ジェイエスイー 石材表面の加工処理方法とその装置
US5241723A (en) * 1991-10-21 1993-09-07 The Babcock & Wilcox Company Nozzle structure with improved stream coherence
CA2115109C (en) * 1994-02-01 2000-04-25 James P. Vanderberg Automated sludge lance
US5778831A (en) * 1994-03-18 1998-07-14 Bergemann Usa, Inc. Sootblower lance with expanded tip
US5782209A (en) * 1995-09-20 1998-07-21 The Babcock & Wilcox Company Segmented automated sludge lance
FR2742858B1 (fr) * 1995-12-22 1998-03-06 Framatome Sa Procede et dispositif de nettoyage d'une plaque tubulaire d'un echangeur de chaleur depuis l'interieur du faisceau de l'echangeur de chaleur
CA2474288C (en) * 2003-07-16 2009-05-12 Atomic Energy Of Canada Limited Collection system for the mechanical cleaning of heat exchanger tubes
KR101103820B1 (ko) * 2009-09-18 2012-01-06 한전케이피에스 주식회사 증기발생기 2차측 듀얼타입 랜싱장치
WO2011126579A1 (en) * 2010-04-10 2011-10-13 Dixon Christopher J Heat exchanger maintenance technique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311092A (en) * 1965-12-20 1967-03-28 Combustion Eng Type sootblower for cleaning the tubes of furnace walls
US4079701A (en) * 1976-05-17 1978-03-21 Westinghouse Electric Corporation Steam generator sludge removal system
US4273076A (en) * 1978-12-28 1981-06-16 Westinghouse Electric Corp. Steam generator sludge lancing apparatus

Also Published As

Publication number Publication date
ES8402923A1 (es) 1984-02-16
DE3260028D1 (en) 1984-02-09
ES512429A0 (es) 1984-02-16
JPS57198899A (en) 1982-12-06
EP0067739A1 (de) 1982-12-22
KR830010368A (ko) 1983-12-30
FR2506428A1 (fr) 1982-11-26
FR2506428B1 (de) 1983-10-07
US4452183A (en) 1984-06-05

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