WO1996028691A1 - Dispositif et procede de nettoyage de la plaque tubulaire d'un generateur de vapeur - Google Patents

Dispositif et procede de nettoyage de la plaque tubulaire d'un generateur de vapeur Download PDF

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Publication number
WO1996028691A1
WO1996028691A1 PCT/DE1996/000450 DE9600450W WO9628691A1 WO 1996028691 A1 WO1996028691 A1 WO 1996028691A1 DE 9600450 W DE9600450 W DE 9600450W WO 9628691 A1 WO9628691 A1 WO 9628691A1
Authority
WO
WIPO (PCT)
Prior art keywords
spray
longitudinal axis
band
lance
steam generator
Prior art date
Application number
PCT/DE1996/000450
Other languages
German (de)
English (en)
Inventor
Rudolf Baumgartl
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
Publication of WO1996028691A1 publication Critical patent/WO1996028691A1/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 cleaning 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 compared to loose impurities increase in an extent of several centimeters.
  • a flexible spray lance 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 there are channels with a circular cross section. Metallic capillaries are inserted into these channels, through which the spray liquid flows to the spray head. leads.
  • 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 lane of the steam generator and can be moved along this tube lane.
  • To drive the belt several jointly driven gear wheels are provided, the teeth of which engage in corresponding perforations of the belt.
  • the free end of the spray lance is aligned with the pipe gap through the curved end of the rigid guide.
  • At the free end of the spray lance there is a spray head with several nozzles from which spray jets emerge horizontally to the front, horizontally to the side and downwards towards the tube sheet.
  • a flexible spray lance which is constructed from a band of spring steel on which one or more capillaries for the spray liquid are attached on one side.
  • the narrow sides of the belt are guided in grooves in an upper and a lower plate which are introduced into the pipe lane of the steam generator.
  • the groove in the lower plate causes the belt to deflect onto a pipe gap.
  • the belt is driven by a pushing force exerted on the belt from behind.
  • the capillaries are laid in a wave shape on the band 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 invention is based on the object of specifying a device for cleaning a tube sheet of a steam generator which can be introduced into the tube gaps and can be held in a stable position above the tube sheet even at high spray pressure, so that firmly adhering deposit can be removed safely.
  • the invention is also based on the object of specifying a method for cleaning a tube sheet of a steam generator.
  • the first-mentioned object is achieved with a device having the features of claim 1.
  • the device for cleaning a tube sheet of a steam generator with a spray liquid contains according to the invention
  • two outlet openings are provided in the spray head, the normals of which are inclined at angles to the longitudinal axis which, in relation to this longitudinal axis, are of equal size in opposite directions.
  • a steel band is provided as the spray lance.
  • the strip has a plurality of holes in its longitudinal direction, through which at least one flexible, preferably metallic capillary made of a nickel-titanium alloy is threaded as a line.
  • the second-mentioned object is achieved with a method having the features of claim 8.
  • the method for cleaning a tube sheet of a steam generator with a spray liquid comprises the following features according to the invention:
  • Long flexible spray lance is arranged longitudinal axis
  • FIGS. 4 and 5 show a further embodiment of a device according to the invention within the steam generator in a side view transversely to the Rohrgasse or in a plan view.
  • 6 and 7 show a side view (flat side) and a top view (narrow side) of a spray lance according to the invention and in FIG. 8 the free end of the spray lance is shown enlarged.
  • 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 14.
  • the flexible spray lance 50 is constructed from a band 52 on which lines 58 for supplying a spray head 63 arranged at the free end 53 are laid.
  • 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 the case for example European patent specification 0 084 867 is known.
  • 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 a pneumatically actuated piston 28.
  • pneumatically extendable support elements 30 are provided in pairs, each of which is supported on opposite heating pipes 10 at the edge of the pipe alley 12.
  • a feed device 40 On the transport device 20, a feed device 40 is arranged, which contains a motor-driven drive roller 41 and an associated guide roller 42 which is set against its circumference.
  • the flexible spray 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.
  • 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 spray 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 be guided through the hand hole 4 with the flat side horizontally oriented and inside the steam generator 2 Can be turned 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 is provided which is pivotable in its entirety about an axis 49 running parallel to the tube sheet.
  • rollers 410, 420, 430 and 440 are provided for driving, deflecting and aligning the spray 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.
  • the spray lance 50 is preferably constructed from a flexible metallic band 52 made of chromium-nickel steel with a wall thickness between 0.1 and 0.2 mm, into which recesses or holes 54 which are equidistant from one another parallel to its longitudinal direction are punched which form two rows 56a and 56b.
  • a line or a capillary 58 for the spray head 63 is threaded through each of 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 straight line towards the channel into which the capillary 58 can simply be inserted.
  • recesses in the form of narrow slots transverse 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 emerges from outlet openings 65.
  • the outlet openings 65 are arranged perpendicular to the flat side of the band 52, i. H. 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, i. H. adapted to the quantity of spray liquid exiting from them per unit of time, arranged so inclined to the longitudinal axis 62 in the belt plane that the sum or resultant F of the reaction forces Fa and Fb exerted on the belt 52 by the spray liquid emerging is approximately parallel to the Longitudinal axis 62 of the band 52 acts.
  • the across of the spray liquid emerging from them i. H. adapted to the quantity of spray liquid exiting from them per unit of time, arranged so inclined to the longitudinal axis 62 in the belt plane that the sum or resultant F of the reaction forces Fa and Fb exerted on the belt 52 by the spray liquid emerging is approximately parallel to the Longitudinal axis 62 of the band 52 acts.
  • 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.
  • nozzles 64 or outlet openings 65 instead of two nozzles 64 or outlet openings 65, a plurality of outlet openings can also be provided, the orientation of the outlet openings and the respective mass flows also having to be coordinated in this case 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 of an endoscope with which the spraying process is observed can also be laid in the band.

Abstract

La présente invention concerne un dispositif de nettoyage de la plaque tubulaire (6) d'un générateur de vapeur (2) avec un liquide projeté. Ce dispositif comprend une lance de projection (50) souple, parallèle à un axe longitudinal (62), dont une extrémité libre (53) comporte une tête de projection (63). Une conduite (58) d'amenée du liquide à projeter, placée dans la lance (50), présente au moins deux orifices (65) d'où sort le liquide projeté, avec des angles différents (βa, βb), de telle façon que la résultante (F) des forces de recul (Fa, Fb) produites par la sortie du liquide soit, au moins approximativement, parallèle à l'axe longitudinal (62) de la lance (50).
PCT/DE1996/000450 1995-03-15 1996-03-13 Dispositif et procede de nettoyage de la plaque tubulaire d'un generateur de vapeur WO1996028691A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19508801 1995-03-15
DE19508801.8 1995-03-15

Publications (1)

Publication Number Publication Date
WO1996028691A1 true WO1996028691A1 (fr) 1996-09-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/000450 WO1996028691A1 (fr) 1995-03-15 1996-03-13 Dispositif et procede de nettoyage de la plaque tubulaire d'un generateur de vapeur

Country Status (1)

Country Link
WO (1) WO1996028691A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2754330A1 (fr) * 1996-10-07 1998-04-10 Sra Savac Dispositif de nettoyage par jets d'eau sous haute pression, notamment nettoyage d'une plaque tubulaire de generateur de vapeur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4407236A (en) * 1981-09-21 1983-10-04 Combustion Engineering, Inc. Sludge lance for nuclear steam generator
US4498427A (en) * 1983-03-21 1985-02-12 Halliburton Company Sludge lance with multiple nozzle jet head
EP0305483A1 (fr) * 1987-03-18 1989-03-08 Electric Power Res Inst Lance flexible pour l'elimination des depots d'impuretes dans le cote secondaire d'un generateur de vapeur.
US5036871A (en) * 1989-02-22 1991-08-06 Electric Power Research Institute, Inc. Flexible lance and drive system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4407236A (en) * 1981-09-21 1983-10-04 Combustion Engineering, Inc. Sludge lance for nuclear steam generator
US4498427A (en) * 1983-03-21 1985-02-12 Halliburton Company Sludge lance with multiple nozzle jet head
EP0305483A1 (fr) * 1987-03-18 1989-03-08 Electric Power Res Inst Lance flexible pour l'elimination des depots d'impuretes dans le cote secondaire d'un generateur de vapeur.
US5036871A (en) * 1989-02-22 1991-08-06 Electric Power Research Institute, Inc. Flexible lance and drive system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2754330A1 (fr) * 1996-10-07 1998-04-10 Sra Savac Dispositif de nettoyage par jets d'eau sous haute pression, notamment nettoyage d'une plaque tubulaire de generateur de vapeur

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