EP3453960B1 - Verfahren zum rückbau eines dampferzeugers - Google Patents

Verfahren zum rückbau eines dampferzeugers Download PDF

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Publication number
EP3453960B1
EP3453960B1 EP18188017.0A EP18188017A EP3453960B1 EP 3453960 B1 EP3453960 B1 EP 3453960B1 EP 18188017 A EP18188017 A EP 18188017A EP 3453960 B1 EP3453960 B1 EP 3453960B1
Authority
EP
European Patent Office
Prior art keywords
steam generator
heating tubes
opening
cutting
rope
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.)
Active
Application number
EP18188017.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3453960A1 (de
Inventor
Harald Bienia
Pascal Brüggemann
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.)
Nukem Technologies Engineering Services GmbH
Original Assignee
Nukem Technologies Engineering Services GmbH
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.)
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Publication date
Application filed by Nukem Technologies Engineering Services GmbH filed Critical Nukem Technologies Engineering Services GmbH
Publication of EP3453960A1 publication Critical patent/EP3453960A1/de
Application granted granted Critical
Publication of EP3453960B1 publication Critical patent/EP3453960B1/de
Active 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
    • F22B37/002—Component parts or details of steam boilers specially adapted for nuclear steam generators, e.g. maintenance, repairing or inspecting equipment not otherwise provided for
    • F22B37/007—Installation or removal of nuclear steam generators
    • 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
    • F22B37/58—Removing tubes from headers or drums; Extracting tools
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D1/00—Details of nuclear power plant
    • G21D1/003—Nuclear facilities decommissioning arrangements

Definitions

  • the invention relates to a method for dismantling a steam generator or parts thereof, which has a large number of heating tubes starting from a lower tube plate, optionally having a curved course at a distance from the tube plate, the entire envelope of which is surrounded by a steam generator jacket while maintaining a distance is, wherein the heating tubes are severed above the tube sheet by means of a cutting cable, which loops around several heating tubes, and then removed.
  • a cutting cable which loops around several heating tubes
  • the subsequent dismantling at a separate location is usually carried out using a wire saw.
  • the outer shell and the internal fittings are dismantled in one cut.
  • the heating pipes are sawed into individual parts, which then have to be handled individually. This is time-consuming, especially considering that a steam generator contains up to several thousand heating tubes.
  • a generic method is the JP 2014106048 A refer to.
  • a rope is passed around part of the heating pipes of the steam generator in order to then cut them.
  • the object of the present invention is to develop a method that enables easy removal of the heating pipes from the steam generator by cutting the heating pipes inside the steam generator and pulling them out without cutting through the outer shell of the steam generator or that whose static stability is significantly damaged.
  • the invention provides that after the heating pipes have been severed in the bottom area of the steam generator, the steam generator is severed together with the heating pipes in an area that extends below the curved course of the heating pipes or, in the case of heating pipes running in a straight line, below an upper tube plate, and that the Heating pipes are pulled out of the steam generator opening formed in this way.
  • the heating pipes are severed without impairing the statics of the steam generator, in that a cutting cable is guided in the space between the heating pipes and the steam generator jacket in such a way that all heating pipes are encompassed, in order to then cut through them by closing the cutting cable and thus forming an endless cable.
  • the cutting wire is placed in a conventional wire saw, by means of which the cutting wire is driven.
  • the cutting cable By guiding the cutting cable within the gap, i.e. between the inner surface of the jacket and the virtual envelope of the heating pipes, the cutting cable is pulled inwards during cutting and gradually cuts through the heating pipes.
  • the external steam generator shell is not damaged.
  • the steam generator i.e. its shell, is then severed in an area that extends approximately directly below the curved course of the heating tubes or the upper tube plate.
  • the opening thus formed is covered by a shield in which there are removal openings in order to pull out the heating tubes individually or in bundles.
  • the heating pipes which are usually 8 to 12 m long, can be pulled out completely or they can be cut to a desired length, e.g. using hydraulic shears, in order to be placed in the transport baskets provided. In this case, the pulling out is carried out by means of a pulling device.
  • the advantage of using the hydraulic shears is that the heating pipes are simultaneously crushed at their ends.
  • the heating pipes can also be cut to the desired length with a sawing device or a grinding device.
  • the invention is not abandoned if the steam generator is first severed in the upper end area of the heating tubes and then the heating tubes on the lower tube plate.
  • the teaching according to the invention results in the advantage that the heating pipes can be expanded over their entire length, in which the heating pipes show a rectilinear course.
  • the steam generator can be dismantled in the installation position, which saves time and money. Since only the heating pipes are cut through, there is no damage to the jacket, so that its statics are retained.
  • the fact that the heating tubes are cut through immediately when they exit the lower tube plate has the advantage that there is no bending when cutting through, so that the heating tubes can be pulled through the support grid between the plate and the opening without any problems.
  • the cutting cable in order to lay the cutting cable around the heating pipes, the cutting cable is led out in an intermediate step via a third opening, which is present or is made in the casing opposite the first opening, and then, while retaining a section of the Cutting cable outside of the steam generator, the cutting cable is guided to the first or, in the presence of the second, opening to this.
  • the invention is characterized in that, in order to guide the cutting cable around the heating pipes, the cutting cable is introduced into the steam generator via the first opening, is guided in the intermediate space up to a third opening by means of the guide element, which is subjected to force in the direction of the casing, such as is prestressed, out of the third opening, then reintroduced into the steam generator via the third opening or a fourth opening running adjacent to this, then guided by means of the guide element or a second guide element within the intermediate space to the first or second opening and then removed from this . It is provided that when the third and fourth openings are used, the jacket section running between them is removed before the heating pipes are cut.
  • the first and, if the second opening is present, the second opening is or are made directly above the tube plate in the steam generator shell in such a way that the cutting cable when cutting the heating tubes on the Tube sheet is slidably moved.
  • FIG. 6 shows a basic representation of a steam generator 10 which is used, for example, in a nuclear power plant.
  • the essential components of the steam generator 10 are a jacket 12, which consists of a lower section 14 and an upper dome-like section 16 with diameters that differ from one another.
  • the heating pipes can have a curved course. A straight course is also possible. In this case, the heating tubes end in an upper tube sheet.
  • the heating pipes usually have a length of between 8 and 12 m.
  • a partition wall 20 runs between the heating pipes (see 6 ), which separates the steam generator 10 into a hot and a cold side.
  • the heating pipes see 6
  • the invention provides that the heating tubes are severed directly above the tube sheet 18 in order to then be able to pull the heating tubes out of the shell 12 in bundles without affecting the statics of the shell. This has the advantage that the steam generator to be disposed of can be dismantled in the installation position.
  • the heating pipes have a small diameter (approx. 10 - 25 mm) with low wall thicknesses (approx. 1 - 2 mm), there is a risk that the heating pipes will be bent when they are cut through, so that pulling them out is at least more difficult.
  • the heating tubes are severed directly above the base, that is to say at the exit from the tube base. Directly above the ground thus means that the line of intersection virtually coincides with the ground surface. This also includes a distance to the floor surface of a few cm, such as 5 - 10 cm.
  • openings are made in the shell, provided they are not directly in the bottom area Mounting openings should be available, which is usually not the case with steam generators.
  • the course of the openings should be such that they merge tangentially or approximately tangentially into the bottom surface of the tube sheet 18 .
  • the lower part 14 of the steam generator 10 is shown purely in principle, with heating tubes emanating from the tube sheet 18 being drawn in purely schematically, which are identified by the reference symbols 24, 26, 28 by way of example.
  • Support grids 30, 32, 34, 36 are provided to support the heating pipes 24, 26, 28.
  • a sheathing of the heating tubes 23 is also shown.
  • a first bore 42 is made in the jacket 12 . This can be done by burning, melting or using a core hole drill.
  • the heating tubes 24, 26, 28 are surrounded by a virtual overall envelope 44 which runs at a distance from the inner surface 46 of the jacket 12. The gap or space formed in this way is identified by the reference number 50 .
  • a cutting cable 52 or a sawing or cutting element having the same effect is introduced into the space 50 via the opening 42 in order to be guided out again via the opening 42 after surrounding all the heating pipes 24, 26, 28, as can be seen from FIG 3 results.
  • a guide or threading device 54 is provided so that the cutting cable 52 can be guided through the intermediate space 50 , which is in particular a spring steel which is prestressed in such a way that it slides along the inner surface 46 of the jacket 12 .
  • the guiding or threading device 54 has a length that is sufficient for the cutting cable to be guided completely through the intermediate space 50 and laid down.
  • Another way of guiding the cutting cable 52 around the heating tubes 24, 26,28 is that first the guiding or threading device 54 is positioned like the spring steel in the gap 50 between the jacket 12 and the outer heating tubes, then on a End of the threading device 54 the cutting cable 52 is connected to the guiding or threading device 54, such as the spring steel, in order then to pull the guiding or threading device 54 out of the intermediate space 50. At the same time, the cutting cable is drawn into the intermediate space 50 .
  • One end of the cutting cable 52 is connected to the guide element 54, such as spring steel, so that according to the drawing shown in FIG 3 then, when the spring steel 54 is led out of the interior of the jacket 12 via the opening 42, the end of the cutting cable 52 is freely accessible in order to then close it in the usual way using a cable lock, so that an endless cable is created which can be connected by means of a conventional Wire saw can be driven to cut through the heating pipes, as is in principle based on the 4 should be clarified.
  • the guide element 54 such as spring steel
  • Necessary deflection devices are installed without going into detail about them.
  • Corresponding deflection or sliding rollers are shown in principle in the area of the opening 42 and identified by the reference symbols 56, 58.
  • the guide element 54 in particular in the form of a spring steel element, introduced together with the cutting cable 52 via the opening 42, there is according to the embodiment of FIG 7 the possibility that more than one opening is used to guide and deposit the guide element 54 together with the cutting line 52 in the gap 50 between the heating tubes 24, 26, 28 and the jacket 12.
  • the openings also extend in such a way that the cutting cable 52 severs the heating tubes 24 , 26 , 28 directly at the outlet from the tube plate 18 .
  • a total of four openings are provided, namely a first opening 142, a second opening 242, a third opening 342 and a fourth opening 442.
  • a guide element 154 is introduced via the first opening 142 together with the cutting cable 152 and guided along the inner surface 146 of the jacket 12 around heating tubes 124, 126, 128, the virtual overall envelope 144 of which is at a distance from the inner surface 146, i.e. a gap 150 runs between them .
  • the threading device i.e. the guide element 154
  • the third opening 342 is led out via the third opening 342 in order to then reinsert the cutting cable via the fourth opening 442 into the intermediate space 150. This can be done via a corresponding separate guide device 154 or the same guide device.
  • the cutting cable 152 is then guided to the second opening 242 by means of the guide device 154 and threaded out of the second opening 242 .
  • Deflection rollers 156, 158 are located in this area. If the heating pipes 124, 126, 128 are to be severed, the jacket section 220 running between the third and fourth openings 342, 442 is severed so that the cutting cable encloses the heating pipes 124, 126, 128 and can thus cut through, as is the case with the Figures 2 - 4 has been explained.
  • the steam generator 10 After cutting through the heating tubes 24, 26, 28, 124, 126, 128, the steam generator 10, ie the jacket 12 is cut through in an area in which the transition between the straight and curved area of the heating tubes 24, 26, 28, 124, 126, 128 runs, i.e. in 6 at level 120.
  • a shield 122 is applied to the opening thus formed in order to pull out the heating pipes 24, 26, 28, 124, 126, 128, which, as mentioned, can have lengths between 8 and 12 m, through openings present in the shield 122.
  • a tube pulling device not shown, is used, by means of which the heating tubes are pulled out individually or in bundles.
  • the heating pipes 24, 26, 28, 124, 126, 128 can then be cut to a desired length, for example using hydraulic shears, so that the corresponding pipe sections can then be placed in transport baskets. by means of which the pipe sections are transported to the packaging.
  • the transport baskets can be reused.
  • the jacket 12 is then severed in the desired areas. Depending on the installed equipment, this can be done with wire saws or oxy-fuel torches.
  • the guiding or threading device 54, 154 This can be made of spring steel or as a carbon or fiberglass rod, whereby it is also possible to plug them together or to move them apart like a telescope.
  • a hose with variably applied compressed air to regulate the rigidity can also be used as a guide or threading device 54, 154.
  • a further embodiment provides that a rope is attached to a ball.
  • the ball can then be “shot” tangentially into the intermediate space 50, 150, for example with spring force or by means of compressed air, with the cable being pulled along.
  • the cutting cable 52, 152 can be attached at one end in order then, by pulling back the cable, to cut the cutting cable 52, 152 around the heating tubes 24, 26, 28, 124, 126, 128 to lay around.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Plasma & Fusion (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Processing Of Solid Wastes (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Manufacture Of Motors, Generators (AREA)
EP18188017.0A 2017-08-09 2018-08-08 Verfahren zum rückbau eines dampferzeugers Active EP3453960B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017118075.3A DE102017118075B4 (de) 2017-08-09 2017-08-09 Verfahren zum Rückbau eines Dampferzeugers

Publications (2)

Publication Number Publication Date
EP3453960A1 EP3453960A1 (de) 2019-03-13
EP3453960B1 true EP3453960B1 (de) 2022-06-22

Family

ID=63174114

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18188017.0A Active EP3453960B1 (de) 2017-08-09 2018-08-08 Verfahren zum rückbau eines dampferzeugers

Country Status (6)

Country Link
EP (1) EP3453960B1 (lt)
DE (1) DE102017118075B4 (lt)
EA (1) EA037316B1 (lt)
ES (1) ES2927421T3 (lt)
HU (1) HUE059693T2 (lt)
LT (1) LT3453960T (lt)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022198320A1 (en) * 2021-03-26 2022-09-29 Ats Automation Tooling Systems Inc. Apparatus and method for segmentation of large workpieces

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757422A (en) * 1971-05-03 1973-09-11 Clary Corp Device for marking locations of structural elements
US4192053A (en) * 1977-09-19 1980-03-11 Westinghouse Electric Corp. Method for retubing a steam generator
US4192067A (en) * 1978-10-23 1980-03-11 Westinghouse Electric Corp. Apparatus for cutting through a tube bundle
US4270258A (en) * 1978-12-28 1981-06-02 Westinghouse Electric Corp. Method of retubing a steam generator
SU947570A1 (ru) * 1980-09-12 1982-07-30 За витель J Ю-г.Зайцев, А.В.Белов, П.С.Семенов. .Палагушин, Н.А.Технибедин и Г.П.Мамаев / :; Способ замены поврежденной трубы в теплообменнике
SU1476301A1 (ru) * 1987-01-26 1989-04-30 Уральский научно-исследовательский и проектный институт строительных материалов Кожухотрубный теплообменник
EP0529886B1 (en) * 1991-08-26 1996-02-07 Kabushiki Kaisha Dymosha Method of dismanteling a nuclear reactor
DE19541501A1 (de) 1995-11-07 1997-05-15 Siemens Ag Verfahren und Vorrichtung zum Entsorgen eines nuklearen Dampferzeugers
JP3894900B2 (ja) * 2003-04-02 2007-03-22 戸田建設株式会社 管の切断方法
RU2251164C2 (ru) * 2003-05-19 2005-04-27 Открытое акционерное общество "Специальное конструкторское бюро котлостроения" Способ демонтажа внутреннего устройства парогенератора судовой ядерной энергетической установки
JP4381784B2 (ja) * 2003-11-26 2009-12-09 株式会社 エイブル 解体装置
JP6147490B2 (ja) * 2012-11-26 2017-06-14 三菱重工業株式会社 蒸気発生器の解体方法

Also Published As

Publication number Publication date
DE102017118075B4 (de) 2021-09-30
EP3453960A1 (de) 2019-03-13
DE102017118075A1 (de) 2019-02-14
HUE059693T2 (hu) 2022-12-28
EA201891585A3 (ru) 2019-05-31
EA201891585A2 (ru) 2019-02-28
ES2927421T3 (es) 2022-11-07
LT3453960T (lt) 2022-10-10
EA037316B1 (ru) 2021-03-11

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