WO1996028692A1 - Dispositif et technique pour traiter ou inspecter le fond tubulaire d'un generateur de vapeur - Google Patents

Dispositif et technique pour traiter ou inspecter le fond tubulaire d'un generateur de vapeur Download PDF

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Publication number
WO1996028692A1
WO1996028692A1 PCT/DE1996/000451 DE9600451W WO9628692A1 WO 1996028692 A1 WO1996028692 A1 WO 1996028692A1 DE 9600451 W DE9600451 W DE 9600451W WO 9628692 A1 WO9628692 A1 WO 9628692A1
Authority
WO
WIPO (PCT)
Prior art keywords
band
flexible
lance
belt
transport device
Prior art date
Application number
PCT/DE1996/000451
Other languages
German (de)
English (en)
Inventor
Rainer Kunz
Herbert Schramm
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP96905725A priority Critical patent/EP0815389A1/fr
Priority to JP8527179A priority patent/JPH11501720A/ja
Publication of WO1996028692A1 publication Critical patent/WO1996028692A1/fr

Links

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
    • 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

Definitions

  • the invention relates to a device and a method for processing or inspecting a tube sheet of a steam generator.
  • these deposits are referred to as deposit kidneys. They arise because loose deposits remain in the poorly flowed inside area of the heating tube bundle, while in the better flowed outside area they are entrained by the flow of the feed water flow on the secondary side. With increasing operating time, these deposits adhere more and more firmly to the tube sheet. Through further accumulation processes, in the course of several operating cycles, deposit conglomerates with an increased metal and salt quantity concentration in relation to loose impurities increase in an extent of several centimeters.
  • a device suitable for this is known, for example, from European Patent 0 305 483.
  • a flexible spray lance is provided, which has a spray head with a plurality of nozzles at its free end, from which the spray liquid emerges.
  • the flexible spray lance is constructed from a flexible band in which channels with a circular cross cut. Metallic capillaries are inserted into these channels, through which the spray liquid is led to the spray head.
  • the band and the channels are made in one piece by extrusion from a plastic.
  • the belt is mounted in a rigid guide with a curved end, with which it can be deflected by a predetermined angle.
  • the rigid guide is mounted in a transport device which can be introduced into the tube passage of the steam generator and can be moved along this tube passage.
  • To drive the belt several jointly driven gear wheels are provided, the teeth of which engage in corresponding perforations of the belt.
  • the curved end of the rigid guide aligns the free end of the spray lance with the pipe gaps.
  • Such a segmented band is also used in the devices for inspecting and processing the tube sheet known from US Pat. No. 5,065,703 and US Pat. No. 5,286, 154, in which inspection optics and mechanical processing tools, for example drills or Gripping tools are used.
  • inspection optics and mechanical processing tools for example drills or Gripping tools are used.
  • the segments connected to one another are so wide, however, that very narrow pipe gaps, as they are in triangular division heating tube bundles, can no longer be used.
  • a flexible spray lance which is constructed from a band made of spring steel, on which one or more capillaries for the spray liquid are attached on one side.
  • the capillaries are wave-shaped and open downwards at the free end of the band into a semicircular recess on the underside of the band, so that the spray liquid emerging from them is directed downwards onto the tube sheet.
  • the narrow sides of the belt are guided in grooves in an upper and a lower plate, which are introduced into the tube lane of the steam generator.
  • the groove in the lower plate deflects the belt onto a pipe gap.
  • the belt is driven by a pushing force exerted on the belt from behind. This requires a high bending stiffness of the band and is also only possible with steam generators in which a hand hole is arranged at the same height as the pipe lane.
  • the invention is based on the object of specifying a device for processing and inspecting the tube sheet of a steam generator, which is of simple construction and can also be used in steam generators in which the hand hole is not arranged at the height of the tube passage, and which also for the Machining and inspection of narrow pipe gaps is suitable.
  • the invention is based on the object of specifying a method for processing and inspecting the tube sheet of a steam generator.
  • the first-mentioned object is achieved with a device having the features of claim 1.
  • the device for processing or inspecting a tube sheet of a steam generator contains according to the invention a) a flexible lance with a flexible band, in which at least one flexible supply line for a processing or inspection head arranged at a free end of the lance is arranged, b) a transport device for the flexible lance that can be inserted into a pipe lane of the steam generator , c) a feed device arranged on the transport device for feeding, deflecting and aligning the flexible belt at an angle to a longitudinal axis of the transport device, d) rollers being provided in the feed unit for feeding, deflecting and aligning the belt are between which the tape is guided and of which at least one roller can be driven to advance the tape.
  • a feed device is provided which is pivotably arranged in the transport device.
  • a feed device arranged vertically adjustable to the longitudinal axis of the transport device is provided.
  • a transport device which contains a striding device for its forward movement, which can be supported laterally on heating pipes arranged at the edge of the pipe lane. This enables the device to be positioned precisely relative to the pipe gaps.
  • a band made of steel which has recesses arranged one behind the other in its longitudinal direction and through which the supply line is threaded.
  • This enables a particularly narrow and stable construction.
  • in each case in the longitudinal direction of the band between the recesses are formed for receiving the supply line, which alternately extend to one and the other side of the band.
  • a spray head is provided as the processing head, which is supplied with a spray liquid via a metallic capillary fixed to the belt, preferably a capillary consisting of a nickel-titanium alloy.
  • a spray head is provided with at least two outlet openings for the spray liquid, which are inclined at different angles against a longitudinal axis of the belt.
  • a recovery tool is provided as the processing head, which can be actuated via a cable pull guided in the band.
  • an optical fiber cable for an endoscope arranged at the free end of the lance can be guided in the band.
  • a transport device is introduced into a pipe lane of the steam generator, the b) carries a flexible lance with a flexible band, in which at least one flexible supply line for a processing or inspection head arranged at a free end of the lance is arranged, and on which
  • a feed device for advancing, deflecting and / or aligning the flexible belt at an angle to a longitudinal axis of the transport device is arranged, whereby
  • the flexible belt is guided between rollers mounted in the feed device, at least one roller of which is driven to feed the belt.
  • a device according to the invention in a working position in the steam generator is illustrated in a top view or in a side view parallel or transverse to a pipe lane.
  • IG 4 shows a further embodiment of a device according to the invention within the steam generator in a side view transverse to the Rohrgasse.
  • IG 5 shows a further advantageous embodiment of the invention in a plan view.
  • IG 6 and 7 show in a side view (flat side) and a top view (narrow side) a flexible band provided as a spray lance and in IG 8 the free end of the spray lance is shown enlarged.
  • IG 9 and 10 show further configurations of the flexible band.
  • IG 11 shows a flexible belt with a gripping tool as the machining head.
  • FIG. 1 shows a steam generator 2 in a horizontal partial section at the height of a hand hole 4.
  • a steam generator 2 is shown with a triangular arrangement of the heating pipes 10, in which there are particularly narrow pipe gaps.
  • the flexible lance 50 is constructed from a band 52 on which supply lines 58, 66, 72 for supplying a processing or inspection head 63, 68, 70 arranged at the free end 53 are arranged.
  • the transport device 20 comprises a slide plate 21 with which it is placed on the tube sheet 6.
  • a walking mechanism is provided in the transport device 20, as is known, for example, from the European patent specification 0 084 867.
  • the transport device 20 comprises two support bodies 22 and 24 which can be displaced relative to one another in a longitudinal axis 26 of the transport device by means of a pneumatically actuated piston 28.
  • pneumatically extendable support elements 30 are provided in pairs, each of which is supported on opposite heating pipes 10 on the edge of the pipe lane 12.
  • a feed device 40 On the transport device 20, a feed device 40 is arranged, which has a motor-driven drive roller 41 and an associated one, which is set against its circumference Contains guide roller 42.
  • the flexible lance 50 is threaded into the drive roller 41 and guide roller 42.
  • the feed device 40 contains two further guide rollers 43 and 44, which are mounted against one another on their circumference and receive the lance 50 threaded between the drive roller 41 and the guide roller 42 and at an angle ⁇ 1 to the longitudinal axis 26 and thus to a central axis 14 of the pipe line parallel to it Set 12. In the example of the figure, this angle is 90 °, so that the lance 50 can be moved into the pipe gaps 14.
  • the drive roller 41 and the guide roller 43 are coupled to one another by a circumferential belt 45.
  • a belt 47 is also guided around the guide rollers 42 and 44 and a deflection roller 46, which lies in the area of the drive roller 41 on the belt 45. This measure results in a particularly secure guidance of the lance 50.
  • the deflection angle ⁇ 1 of the lance 50 is determined by the mutual position of the drive roller 41 and the guide rollers 42, 43 and 44 on the transport device 20.
  • the feed device 40 can additionally be displaced relative to the transport device 20 parallel to the longitudinal axis 26 or rotated about a vertical axis in order to enable the flexible lance 50 to be precisely aligned with the pipe gaps 14.
  • FIG. 2 shows how the lance 50 constructed from the band 52 is passed through the hand hole 4 from the outside. Since the band 52 cannot be bent in the plane defined by its flat sides and the tube sheet 6 is located below the lower edge of the hand hole 4, the band 52 must pass through with the horizontally oriented flat side Hand hole 4 guided and rotated within the steam generator 2 by 90 °.
  • the feed device 40 is arranged in the transport device 20 so as to be pivotable about an axis of rotation 48 running parallel to the longitudinal axis 26.
  • the free end 53 of the lance 50 can be positioned directly above the tube sheet 6 even with a different extension length 1.
  • the feed device 40 is also mounted on a slide 28, which enables the height of the feed device 40 to be adjusted perpendicular to the longitudinal axis 26 and thus parallel to the heating tubes 10.
  • a feed device 400 which is pivotable in its entirety about an axis 49 running parallel to the tube sheet, is provided.
  • rollers 410, 420, 430 and 440 are provided for driving, deflecting and aligning the lance 50.
  • the entire feed device 400 is arranged to be displaceable on the transport device 20 or to be pivotable about an axis perpendicular to the longitudinal axis 26, in order to enable precise threading into the pipe gaps 16.
  • a lance 50 contains a flexible metallic material which preferably consists of a chromium-nickel steel
  • Recesses or holes 54 are punched, which form two rows 56a and 56b.
  • a supply line for example a capillary 58 for a processing head arranged at the free end 53, in the exemplary embodiment a spray head 63, is threaded through these rows 56a and 56b.
  • the capillaries 58 preferably consist of a memory metal consisting of a nickel-titanium alloy, for example a metal commercially available under the name Nitinol SE 502.
  • Their compressive strength is greater than 1000 bar with an outside diameter between 2 and 3 mm.
  • the capillaries 58 are guided through the holes 54 alternately from opposite sides of the band 52. Between the holes 54 of a row 56a or 56b, parallel to a longitudinal axis 62 of the band 52, groove-shaped formations or beads 60 with a semicircular cross section are embossed into the band 52, which alternately alternately on one and on the other side of the band 52 are formed. In this way, the formations 60, together with the holes 54 in a row 56a or 56b, form a rectilinear channel into which the capillary 58 can simply be inserted.
  • recesses in the form of narrow slots transversely to the longitudinal axis 62 can also be provided, through which the capillary 58 can be threaded.
  • the capillaries 58 assigned to the rows 56a and b are bent away from a longitudinal axis 62 of the band 52 in the plane defined by the flat side of the band 52.
  • nozzles 64 are preferably arranged, in which the emerging spray jet is accelerated and exits from outlet openings 65.
  • the outlet openings 65 are arranged perpendicular to the flat side of the band 52, ie the normal or central axes of the outlet openings 65 lie approximately in the plane (band plane) defined by the flat side.
  • the outlet openings 65 are arranged with their normals at an angle ⁇ a or ⁇ b to the longitudinal axis 62.
  • the outlet openings 65 are adapted to the respective mass flow of the spray liquid emerging from them, that is to say adapted to the quantity of spray liquid emerging from them per unit of time, so inclined to the longitudinal axis 62 in the belt plane that the sum or the resultant F of the the band 52 acts approximately parallel to the longitudinal axis 62 of the band 52 by the reaction forces Fa and Fb exerted by the spray liquid.
  • the reaction forces acting transversely to the longitudinal axis 62 and approximately in the strip plane in the exemplary embodiment of the drawing are compensated. This prevents the band 52 from being pushed away from the tube bottom.
  • a symmetrical arrangement is particularly necessary in the case of a structurally identical design of the nozzles 64 if instead of the two capillaries 58 provided in the exemplary embodiment only one capillary is provided, from which two paths are only branched off directly in front of the spray head 63.
  • the mass flows must be adjusted accordingly until the transverse forces are compensated. This can be done by a fixed setting or by controlling the mass flows distributed over the capillaries 58.
  • a plurality of outlet openings can also be provided, in this case too, the orientation of the outlet openings and the respective mass flows must be coordinated with one another in such a way that compensation of the transverse forces occurs.
  • the nozzles 64 or outlet openings 65 can also be arranged with their normal or central axis obliquely to the flat side of the band 52.
  • the angles and the respective mass flows can be coordinated or controlled in such a way that the force components occurring transversely to the flat side of the band 52 are compensated for in this case, so that a lateral deflection of the band 52 is avoided.
  • an optical fiber cable 66 of an endoscope 68 is inserted into the channel 56b, with which the spraying process can be observed.
  • FIG. 10 shows a band with three channels 56a, b, c, the two channels
  • a channel 56c contains an optical fiber cable 66 of an endoscope 68.
  • a gripping tool 70 for example, is arranged at the free end 53 of the lance 50 as a rescue tool.
  • traction cables 72 are guided as supply lines through the holes 54, with which torque can be exerted on pivotably mounted pliers 74 and 76.

Abstract

Le dispositif proposé pour traiter ou inspecter le fond tubulaire (6) d'un générateur de vapeur (2) contient une lance flexible (50) avec une bande flexible (52) sur laquelle est montée au moins une conduite d'alimentation flexible (58, 66, 72) pour la tête de travail ou d'inspection (63, 68, 70) montée à l'extrémité dégagée de la lance, ainsi qu'un dispositif de transport (20) qui peut être introduit dans un passage tubulaire (6) du générateur de vapeur (2). Sur ce dispositif de transport (20) est monté un système d'avancement (40) qui permet de faire avancer, d'infléchir et d'aligner la bande flexible (52) selon un certain angle (α1; α2) par rapport à l'axe longitudinal (26) du dispositif de transport (20). Pour l'avancement, l'inflexion et l'alignement de la bande, le dispositif de transport est équipé de rouleaux (41, 42, 43, 44). La bande (52) est guidée entre ces rouleaux dont au moins un (41, 42, 43, 44) peut être entraîné pour faire avancer la bande (52).
PCT/DE1996/000451 1995-03-15 1996-03-13 Dispositif et technique pour traiter ou inspecter le fond tubulaire d'un generateur de vapeur WO1996028692A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP96905725A EP0815389A1 (fr) 1995-03-15 1996-03-13 Dispositif et technique pour traiter ou inspecter le fond tubulaire d'un generateur de vapeur
JP8527179A JPH11501720A (ja) 1995-03-15 1996-03-13 蒸気発生器の管床の加工あるいは点検装置および方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19508799 1995-03-15
DE19508799.2 1995-03-15

Publications (1)

Publication Number Publication Date
WO1996028692A1 true WO1996028692A1 (fr) 1996-09-19

Family

ID=7756399

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/000451 WO1996028692A1 (fr) 1995-03-15 1996-03-13 Dispositif et technique pour traiter ou inspecter le fond tubulaire d'un generateur de vapeur

Country Status (3)

Country Link
EP (1) EP0815389A1 (fr)
JP (1) JPH11501720A (fr)
WO (1) WO1996028692A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001048434A1 (fr) * 1999-12-23 2001-07-05 Olmi S.P.A. Echangeur de chaleur a faisceau tubulaire possedant un acces de nettoyage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1024113C2 (nl) * 2003-08-14 2005-02-15 Peinemann Equipment Bv Lansinrichting met reciprocerende aandrijving.
KR102602989B1 (ko) * 2023-06-07 2023-11-16 주식회사 디에이치기술 증기발생기의 2차측 튜브시트 육안검사용 프로브 장치의 신호 노이즈 저감 장치

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4355536A (en) * 1979-10-02 1982-10-26 Westinghouse Electric Corp. Sludge measuring apparatus and ultrasonic probe assembly therefor
EP0084867A1 (fr) * 1982-01-25 1983-08-03 Kraftwerk Union Aktiengesellschaft Manipulateur pour passages entre tubes pour éliminer sous haute pression les boues dans les échangeurs de chaleur
FR2544123A1 (fr) * 1983-04-07 1984-10-12 Thome Jean Patrick Dispositif et procede d'intervention sur des tubes de generateurs de vapeur de chaudieres nucleaires
US4638667A (en) * 1984-01-20 1987-01-27 Westinghouse Electric Corp. Remote probe positioning apparatus
US5036871A (en) * 1989-02-22 1991-08-06 Electric Power Research Institute, Inc. Flexible lance and drive system
EP0526120A1 (fr) * 1991-07-31 1993-02-03 Electric Power Research Institute, Inc. Guide glissant pour lance et lance flexible

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4355536A (en) * 1979-10-02 1982-10-26 Westinghouse Electric Corp. Sludge measuring apparatus and ultrasonic probe assembly therefor
EP0084867A1 (fr) * 1982-01-25 1983-08-03 Kraftwerk Union Aktiengesellschaft Manipulateur pour passages entre tubes pour éliminer sous haute pression les boues dans les échangeurs de chaleur
FR2544123A1 (fr) * 1983-04-07 1984-10-12 Thome Jean Patrick Dispositif et procede d'intervention sur des tubes de generateurs de vapeur de chaudieres nucleaires
US4638667A (en) * 1984-01-20 1987-01-27 Westinghouse Electric Corp. Remote probe positioning apparatus
US5036871A (en) * 1989-02-22 1991-08-06 Electric Power Research Institute, Inc. Flexible lance and drive system
EP0526120A1 (fr) * 1991-07-31 1993-02-03 Electric Power Research Institute, Inc. Guide glissant pour lance et lance flexible

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001048434A1 (fr) * 1999-12-23 2001-07-05 Olmi S.P.A. Echangeur de chaleur a faisceau tubulaire possedant un acces de nettoyage

Also Published As

Publication number Publication date
EP0815389A1 (fr) 1998-01-07
JPH11501720A (ja) 1999-02-09

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