WO2001057462A1 - Dispositif de detartrage pour un generateur de vapeur - Google Patents

Dispositif de detartrage pour un generateur de vapeur Download PDF

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Publication number
WO2001057462A1
WO2001057462A1 PCT/JP2000/000593 JP0000593W WO0157462A1 WO 2001057462 A1 WO2001057462 A1 WO 2001057462A1 JP 0000593 W JP0000593 W JP 0000593W WO 0157462 A1 WO0157462 A1 WO 0157462A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
lance
steam generator
nozzle
tip
Prior art date
Application number
PCT/JP2000/000593
Other languages
English (en)
Japanese (ja)
Inventor
Tadashi Shiraishi
Takehiko Ichioka
Hideya Okada
Fumitoshi Nakao
Toshiyuki Kinugasa
Original Assignee
Mitsubishi Heavy Industries, Ltd.
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
Priority to JP22344998A priority Critical patent/JP3986172B2/ja
Priority claimed from JP22344998A external-priority patent/JP3986172B2/ja
Application filed by Mitsubishi Heavy Industries, Ltd. filed Critical Mitsubishi Heavy Industries, Ltd.
Priority to DE60042400T priority patent/DE60042400D1/de
Priority to CA002369481A priority patent/CA2369481C/fr
Priority to CN00805617A priority patent/CN1130545C/zh
Priority to US09/937,600 priority patent/US6513462B1/en
Priority to PCT/JP2000/000593 priority patent/WO2001057462A1/fr
Priority to KR10-2001-7012557A priority patent/KR100446826B1/ko
Priority to EP00902850A priority patent/EP1170567B1/fr
Publication of WO2001057462A1 publication Critical patent/WO2001057462A1/fr

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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
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B08B3/102—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration with means for agitating the liquid
    • 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
    • F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
    • F22B37/47—Applications, arrangements, or dispositions of alarm or automatic safety devices responsive to abnormal temperature, e.g. actuated by fusible plugs
    • F22B37/475—Safety devices with fusible plugs
    • 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
    • F28G1/166—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from external surfaces of heat exchange conduits
    • 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
    • F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00

Definitions

  • the present invention relates to a heat exchanger such as a steam generator used in, for example, a nuclear power plant, and more particularly to a removing device for removing sludge or scale on a tube plate or in a tube bank of a steam generator. . Background technology
  • reference numeral 1 denotes a steam generator of the steam generator, and the steam generator 1 has a handhole or an inspection hole (only one is denoted by reference numeral 17) in the diameter direction. It has a substantially cylindrical body 2 formed opposite to the body.
  • a tube sheet 3 is provided at a lower portion in the body 2, and defines a water chamber 4 in cooperation with the bottom 2 a of the body 2.
  • a large number of normal U-shaped heat transfer tubes 5 are arranged above the tube sheet 3 so as to communicate with the water chamber 4, and are supported laterally across the large number of the heat transfer tubes 5.
  • the pipe support plates 6a, 6b ⁇ ⁇ ⁇ ⁇ 6f are arranged horizontally so that they can be connected to each other.
  • Each heat transfer tube 5 is provided with a tube support plate 6a, 6b, 6:
  • This beck hole is shown schematically in FIG. 10 by reference numeral 7, typically on the tube support plate 6 a.
  • the space in the water chamber 4 is divided into a hot leg portion 4a and a cold leg portion 4b by a partition plate 8, and one end of each U-shaped heat transfer tube 5 communicates with the hot leg portion 4a, and the other end. Communicates with the cold leg section 4b.
  • the tube sheet 3 is also formed with a number of holes for receiving the ends of the heat transfer tubes as schematically indicated by reference numeral 3a.
  • reference numeral 9 denotes a manhole that allows an operator to enter the water chamber 4
  • reference numeral 10 denotes a coolant inlet nozzle communicating with the hot leg portion 4 a
  • reference numeral 11 denotes a coolant inlet nozzle.
  • the coolant outlet nozzle communicating with the cold leg portion 4b, reference numeral 12 is a trunnion for lifting the steam generator.
  • a steam outlet is formed at the top of the steam generator.
  • Above the steam generator 1 there is a water supply nozzle (not shown) for introducing water into the body.
  • the high-temperature and high-pressure coolant sent from the nuclear reactor passes through the coolant inlet nozzle 10 to the hot leg section 4a of the water chamber 4 of the steam generator. Then, it passes through the inside of the heat transfer tube 5, reaches the cold leg portion 4b, and returns to the reactor via the coolant outlet nozzle 11 again.
  • water is supplied from the water supply nozzle into the body 2 and fills around the heat transfer tube 5. Therefore, the feed water is heated by the high-temperature and high-pressure coolant flowing inside the heat transfer pipe 5 to be turned into steam, which exits the steam outlet and is sent to a steam bin (not shown) for power generation.
  • the steam generator is a device that is relatively widely used in various industrial fields, but as it is used, the internal heat transfer tube 5, tube sheet 3, and tube support plate 6a, 6b ⁇ ⁇ Since contamination called scale occurs at 6 f, etc., it is understood that it is necessary to remove the scale in order to maintain the performance of the steam generator and to avoid situations such as corrosion caused by the scale.
  • various scale removing devices have been proposed and developed to remove such scales.
  • Steam generators for nuclear power plants have health care restrictions that prevent workers from being exposed to more than the prescribed amount of radiation, and despite their relatively large size, However, the number of heat transfer tubes inside it is very large, and they are densely arranged. Furthermore, each heat transfer tube has a diameter of about
  • Fig. 11 shows a typical example of a scale removing device around a tube sheet described in Japanese Patent Application Publication No. Hei 4 (1998) -503,644. It is shown in a tube lane 16 directly above the vessel plate 3 in a state extending laterally from a handhole or inspection hole 17, and moves along a support rail 18. Contains 0. A flexible lance 19 extends through this transport 20 to the desired washing position between the rows of tubes. Figure 12 shows this flexible lance 19, especially the cleaning head at its tip.
  • the flexible lance 19 has four high-pressure hoses 22 fixed to each other by a member 25 called a hose bar structure, a nitrogen purge line 23, and an optical fiber cable 24 of a video probe. These tips are connected to the cleaning head 26.
  • a high-pressure hose 22 At the front end of the cleaning head 26, a high-pressure hose 22 A plurality of nozzles 27 are provided to communicate with the water jet, and a water jet 28 (FIG. 11) is jetted from the nozzle 27 during cleaning.
  • a scale removing device around the tube support plate there is a device described in Japanese Patent Application Laid-Open No. Hei 9-210607 of the present applicant, as typically shown in FIG. . This scale removing device generally indicated by reference numeral 30 in FIG.
  • the insertion mechanism 31 has a driving device 33 on the near side, It has a fixing plate 34 on the tip side, and is fixed by the operation of the second jack 35, and a receiving plate 36 and a first jack 37 are provided between the near side and the tip side, and the guide mechanism 32 is provided.
  • the mechanism turns 90 degrees upward.
  • the guide mechanism 32 is divided into a number of strip-shaped holding plates 38 so that the curved surface can be moved, and a high-pressure hose and an electric cable 39 can be attached to the back of the guide mechanism 32, and
  • a cleaning unit main body 40 is provided at the tip of the mechanism 32, and the cleaning head 41 there is a mechanism capable of rotating by 180 degrees.
  • a plurality of nozzles are similarly formed in the cleaning head 41, from which a water jet is jetted toward a part to be cleaned.
  • By expanding and contracting the guide mechanism 32 it is attempted to remove the scale around a plurality of tube support plates by passing through the flow slot 13 provided in each tube support plate.
  • a technology to prevent the adhesion itself is being developed. For this reason, in recent steam generators, the scale adhesion range has become narrower than before, and the thickness of the scale has also become extremely thin, but on the other hand, the adhesive force of the scale that has adhered is large.
  • FIG. 15 is an explanatory diagram showing an example of the state of the scale attached to the heat transfer tubes on the tube sheet.
  • the scale (hard scale) of the conventional steam generator is shown on the left, with the axis of the heat transfer tubes as the center.
  • the right side shows the state of scale (hard scale) adhesion in recent steam generators.
  • the conventional practice has been to increase the pressure of the water jet. In this case, a slight improvement was observed for the scale on the jet trajectory of the water jet, but only to the extent that it was ineffective for scales in the area outside the jet trajectory. And remained without being removed.
  • FIG. 16 (a) is a perspective view showing an example of the used cleaning head, and its front end face or front A has upper and lower parts. A total of eight nozzle holes A 1 to A 4 and A 5 to A 8 are formed in two areas, and a total of four nozzle holes B 1 to: B 4 (B 3 , B 4 are not shown).
  • This cleaning head is inserted between the heat transfer tubes 5 as shown in Fig. 16 (b), and pulled through the nozzle holes on the front end face a and both side faces B of the cleaning head while pulling in the direction of the arrow. Cleaning is performed by spraying water jets 28 A and 28 B.
  • the area where the water jets 28A and 28B hit is the washable area, and the other area is the area outside the spray trajectory.
  • ⁇ Y '' indicates a direction perpendicular to the X direction on a plane, where X is the direction along the tube brain 16 shown in FIG. . Therefore, ⁇ 14, ⁇ 15, ⁇ 16 represent the 14th, 15th, and 16th heat transfer tubes based on the tube lane 16.
  • Fig. 16 (c) shows the water jets 28 8, 2 2 injected as shown in Fig. 16 (b).
  • FIG. 8 is a plan view showing an injection trajectory of 8 mm, and a thick hatched area in the center is an area that can be washed by the water jet 28, and relatively thin areas on the left and right thereof are water jets 28.
  • the cleaning fluid spraying area should be set to the entire surface of the tube sheet and to the side of the heat transfer tube 10 mm or more above the tube sheet (the area outside the spray locus in the current scale removing device). ).
  • the aerial ice jet has a small effective cleaning diameter, and it is difficult to expand the cleaning range with the cleaning nozzle incorporated in the lance. Disclosure of the invention
  • the steam generator descaling apparatus of the first aspect of the present invention comprises a trunk, a tube plate and a plurality of tube support plates horizontally arranged in the trunk in a transverse direction of the trunk.
  • a plurality of heat transfer tubes extending from the tube sheet at one end and terminating at the other end at the tube sheet, and extending in a row through the tube support plates so as to define a tube lane in the body.
  • a steam generator in which a hand hole is formed at a position above the tube sheet in the body portion, wherein a scale removing device inserted from the hand hole and applied for washing around the tube sheet
  • a flexible lance that holds a high-pressure water hose and is movable with respect to the tube sheet and the heat transfer tube; and a cleaning head that is attached to a tip of the flexible lance.
  • a fluid passage communicating with the pressure water hose, a chamber communicating with the fluid passage, and a cavity generation nozzle hole communicating with the chamber are formed.
  • the scale removing device further includes: a suspension guide device horizontally arranged on the tube sheet; and a lance carrier suspended by the suspension guide device and intended to move in the horizontal direction through the handhole.
  • the flexible lance is drawn out of the lance carrier through the lance carrier and pulled back, and the tip of the cleaning head does not interfere with the body wall surface that defines the handhole. It is preferable that it is formed on a curved surface.
  • the lance carrier has a cylindrical body through which the flexible lance passes, and the tip of the cleaning head does not protrude from the peripheral surface of the cylindrical body when the flexible lance is completely pulled back. It is preferable that the shape is such.
  • the number of the cavity generation nozzle holes may be one or more, if desired.
  • a descaling device for a steam generator includes a trunk, a plurality of pipe support plates horizontally arranged in the trunk in a transverse direction of the trunk, and a tube in the trunk.
  • a plurality of heat transfer tubes extending in a row through each of the tube support plates so as to define a lane; and the body facing diametrically directly above at least one of the tube support plates.
  • a steam generator in which a flow slot is formed in a portion corresponding to the tube lane of each of the tube support plates.
  • a scale removing device that is inserted, moves up and down through the flow slots formed in each of the tube support plates, and cleans around the tube support plates.
  • a cleaning head attached to the distal end of the flexible lance; a fluid passage communicating with the high-pressure water hose; a chamber communicating with the fluid passage; and a cleaning head inside the cleaning head.
  • a communicating cavity generating nozzle hole is formed.
  • the cleaning head is detachably attached to the head body having the fluid passage, the chamber communicating with the fluid passage formed therein, and the head body.
  • An ultrasonic oscillator can be attached to the nozzle tip as described in claim 7.
  • the nozzle tip includes a hexahedron defining the cavitation generating hole, and two opposing surfaces of the hexahedron excluding the small-diameter end and the large-diameter end of the cavitation generating hole.
  • a thin plate-shaped mounting portion that extends, and a protruding portion that defines a flow path that communicates with the small-diameter end of the cavity generation hole.
  • the head body has a contour corresponding to the shape of the nozzle tip.
  • a recess is formed, and the nozzle tip can be inserted into the recess and attached to the head body by the attachment portion. It is preferable that a CCD camera be provided in the tip of the cleaning head.
  • FIG. 1 is a perspective view of a scale removing device according to the present invention for removing scale around a tube plate of a steam generator
  • FIG. 2 is a perspective view of a scale removing device according to the present invention for removing scale around a tube support plate of a steam generator;
  • FIG. 3 is an enlarged perspective view showing a main part of the scale removing device of FIG. 2.
  • FIG. 4 (a) is a cleaning head of a flexible lance which can be used in the scale removing device of FIGS. 1 and 2.
  • Fig. 4 (b) is a side view,
  • FIG. 5 is an enlarged plan view of a part of FIG. 4 (a) showing the nozzle tip particularly clearly.
  • FIGS. 6 (a), (b) and (c) are diagrams for explaining the outline of the test apparatus using the cleaning head according to the present invention, respectively, and FIG. It is an explanatory view showing propagation of impact pressure when cleaning is performed using the cleaning head shown in c).
  • FIG. 7 is a sectional view showing a modified embodiment of the cleaning head according to the present invention
  • FIG. 8 is a sectional view showing another modified embodiment of the cleaning head according to the present invention.
  • FIGS. 3A to 3D are cross-sectional views showing various nozzle assemblies or nozzle tips that can be used in the cleaning head of the present invention;
  • FIG. 10 is an elevational view showing a body of a conventional steam generator in a cutaway manner to facilitate understanding of the present invention.
  • Fig. 11 is a perspective view of a conventional apparatus for removing scale around a tube sheet
  • Fig. 12 is a cleaning head at the tip of a flexible lens used in the scale removing apparatus of Fig. 11.
  • FIG. 11 is a perspective view of a conventional apparatus for removing scale around a tube sheet
  • Fig. 12 is a cleaning head at the tip of a flexible lens used in the scale removing apparatus of Fig. 11.
  • FIG. 13 is a side view of the cleaning head of FIG.
  • FIG. 14 is a perspective view of a conventional apparatus for removing scale around a tube support plate.
  • FIG. 15 is a diagram for explaining the removal of scale when a conventional water jet is used.
  • Fig. 16 (a) is a partial view of the conventional cleaning head used in the experiment
  • Fig. 16 (b) is a plane showing the water jet injected from the nozzle hole of the cleaning head to the space between the heat transfer tubes
  • Fig. 16 (c) is a plan view showing the area where the water jet can wash the tube sheet, and therefore the area outside the spray trajectory
  • Fig. 16 (d) is the area where the water jet can wash the heat transfer tube. It is an elevational view showing an area outside the injection trajectory.
  • FIG. 1 shows a descaling device 50 for cleaning around a tube sheet according to the present invention, in the body 2 of a steam generator. A number of holes 3a are formed in the tube sheet 3.
  • the end of the heat transfer tube 5 is inserted into each hole 3a, and is fixed watertight.
  • torso 2 In W a pair of round hand holes or inspection holes (only one is shown) 2b are formed at a relatively close position on the upper surface of the tube sheet 3 so as to face each other in the diameter direction.
  • the scale removing device 50 is carried into the body from the hole 2b.
  • a region or a portion 3b which is conveniently shown in the form of a dense dot in this embodiment, represents the adhesion scale to be removed.
  • a scale removing device 50 horizontally disposed above a tube sheet 3 includes a suspension guide device 51 called a monorail having an open lower portion, a suspension guide device 51, and a tube. And a cylindrical lance carrier 52 guided in the horizontal direction along the lane 16.
  • the suspension guide device 51 has a rail portion 53, and a guided portion (not shown) of the lance carrier 52 is engaged with the rail portion 53 to guide the horizontal movement by the rail portion 53. Is done. Illustration of the moving device of the lance carrier 52 is omitted.
  • one end of the monorail 51 is rotatably connected to a length-adjustable support member 55 attached to the tube lane block 54a. Have been.
  • the other end of the monorail 51 (not shown) is attached to a similar support member (not shown) outside the body 2.
  • the tube lane block is also located on the handwheel 2b side as shown by the reference numeral 54b, and has a flow rate similar to the flow distribution plate 56 shown above the monorail 51. It has the function of improving distribution.
  • the position in the height direction of the monorail 51 with respect to the tube sheet 3 and the position in the horizontal direction with respect to the handhole 2b can be freely controlled by adjusting the amount of rotation of the support member 55 and the like.
  • support / protection devices 57 called air balloons are arranged in the longitudinal direction. This support and protection device
  • 5 7 is a flexible bag made of rubber, for example, and after positioning the monorail 51
  • a flexible lance 58 is accommodated in the cylindrical main body 52 a of the lance carrier 52.
  • the flexible lance 58 is flexible as the name implies, and in this embodiment, is curved substantially at a right angle as shown.
  • a lance driving device is disposed in the cylindrical main body 52a, and the lance 58 is reciprocated in the horizontal direction as shown by an arrow, or the cylindrical main body 52a is It can be rotated around the axis.
  • a cleaning head 60 described later is attached to the tip of the flexible lance 58, and the X of the cleaning head 60 is moved by moving the lance carrier 52 by the moving device (not shown).
  • the position of the cleaning head 60 in the Y and Z directions is adjusted by reciprocating or rotating the lance 58 by the lance driving device.
  • reference numeral 59 denotes a blowdown pipe. This boom-down pipe 59 is inherent to the steam generator, and is separate from a drain nozzle (not shown) for removing scale 3b removed by the lance from the tube sheet. Is provided.
  • the moving device, lance driving device, flexible lance and the like of the lance carrier described above may have a known structure, and further description thereof will be omitted.
  • an outer peripheral surface of a body portion 2 includes various devices for operating the scale removing device 10.
  • the operating device assembly 71 is mounted.
  • Guide rail assembly 72 is incorporated within body 2 in operative communication with operating device assembly 71.
  • the guide rail assembly 72 is, in this embodiment, the lowermost
  • the guide rail assembly 72 supports and guides the elevating and lowering device assembly (hereinafter simply referred to as the elevating and lowering device) 7 4. 7 5
  • the elevating device 74 extending vertically upward in FIG. 2 is raised and tilted by a rigid hydraulic upright tilting device 77 with the aid of a winch 76 or the like.
  • the elevating device 74 includes a tube guide device 78 and a telescopic arm assembly 80, and a lance feed device 79 is attached to the distal end of the telescopic arm assembly 80.
  • the cleaning head 82 provided at the tip of the flexible lance 81 is sent to a predetermined position in the tube bank by the lance feeder 79.
  • the cleaning head 82 includes a fluid ejecting nozzle described later, and peels and removes the scale by the pressure of the fluid ejected from the nozzle and colliding with the scale.
  • the removal scale dropped onto the tube support plate is discharged out of the body by another means.
  • a lance feeder 86 is attached to the tip of a telescopic arm 85.
  • the lance feeder 79 includes a lance insertion tube 87 through which a flexible lance 81 passes, and a lance feed mechanism (not shown), which are mounted on a base 88.
  • the lance insertion tube 87 which can be rotated 90 degrees, has a clamp mechanism for supporting the lance insertion tube 87 with a tube group after the tip is positioned between the rows of tubes to be cleaned. 9 are provided.
  • the above-described scale removing device 70 is in a semi-disassembled state when it is outside the steam generator body, but is loaded into the body and assembled by the following procedure.
  • a heat transfer tube protector 84 will be installed in the tube bank lane.
  • the divided guide rail (two divided in the embodiment) constituting the guide rail assembly 72 is introduced into the body 2 through the hand hole 2c.
  • the movable cart 75a is mounted on the guide rail in advance.
  • connecting trolley 75b is carried into the trunk via the handhole, and the movable trolley 75a and the connecting trolley 75b are fixed to form a moving / connecting trolley assembly 75.
  • the hydraulic erecting / tilting device 77 is attached to the elevating device 74, and then the elevating device 74 is held upright as shown in the drawing with the aid of a winch and a rack.
  • the swivel arm section 80b of the extendable arm assembly 80 is swiveled to be perpendicular to the vertical arm section 80a, and then the extendable arm section 85 is extended as appropriate.
  • the lance feeder 86 is operated, and the lance insertion pipe 87 is swung from the upward state shown in FIG. 2 to the horizontal cleaning state shown in FIG. 3, and inserted between the heat transfer tube rows.
  • FIG. 3 By spraying high-pressure water from the cleaning head 82 inserted at the position to be cleaned in this way as shown in FIG. 3, the scale at that position can be removed.
  • a cleaning head suitable for use in the scale removing device 50 around the tube plate shown in FIG. 1 and the scale removing device 70 around the tube support plate shown in FIGS. 2 and 3 will be described.
  • the various embodiments will be described. In order to avoid duplication of description, only the cleaning head 60 of the scale removing device 50 around the tube sheet is described, but the structure of the latter cleaning head 82 is considered to be basically the same. May be.
  • the tip of the lance 58 and the cleaning head 60 attached thereto are shown in FIGS.
  • the structure of the lance 58 itself may be a conventional one as shown in FIG. 10, for example.
  • W 93 a, 93 b, 93 c, ⁇ ⁇ are fixed to each other.
  • the thin washing head 60 is attached to the attachment end block 94 located at the most distal end block 93 a by an appropriate fixing means 95.
  • the cleaning head 60 has a socket portion 60a for receiving each high-pressure water hose 91, and the socket portion 60a communicates with one chamber 60b.
  • the nozzle tip 96 is detachably and liquid-tightly mounted so as to communicate with the chamber 60b.
  • the nozzle tip 96 includes a cube-shaped main body (a hexahedron) 96a such as a dice, and a flange-shaped mounting portion 96 extending from the upper and lower surfaces of the main body 96a in the figure. It has a cylindrical communication part (projection part) 96c projecting from the inner surface of the main body part 96a toward the chamber 60b.
  • the cleaning head 60 is formed with a recess having a shape suitable for receiving the nozzle tip 96 described above.
  • the mounting head 96b is securely fixed to the cleaning head 60 by two setscrews 97, and communicates with the chamber 60b at the communication part 96c.
  • a sealing means such as a ring 98 is disposed around the communication part 96 c so that the nozzle tip 96 can be attached to the cleaning head 60 in a liquid-tight manner.
  • the communication portion 96c is formed with a flow passage 99a having substantially the same diameter, and the main body portion 96a is formed with a conical nozzle hole 99b.
  • the flow path 99a communicates with the chamber 60b at one end and communicates with the small-diameter end of the nozzle hole 99b at the other end.
  • the large-diameter end of the nozzle hole 99 b is exposed to the outside.
  • the high-pressure water that has passed through the high-pressure water hose 91 enters the submerged washing chamber 60b of the nozzle 60b, from which it passes through the flow path 99a of the nozzle tip 96 as a water jet to form a nozzle hole. Injected from 9 9 b.
  • a water jet is injected into the water of the nozzle hole 99 b having the shape as shown in the figure, the liquid around the water jet is discharged.
  • a phenomenon called cavitation occurs in which the liquid evaporates and grows as bubbles. A very high impact pressure is generated when the cavitation bubbles collapse.
  • the cavitation jet can obtain a high impact pressure over a wide range at a lower pressure than a high-pressure water jet, and because bubbles diffuse to generate an impact pressure over a wide area, it cannot be reached with a conventional water jet. Since it also reaches the region where the injection trajectory did not exist, the so-called region outside the injection trajectory can be suitably cleaned. In addition, since a high impact pressure can be obtained over a wide range, the device for operating the lance with the cleaning head has a simple structure, and can be easily made into a robot.
  • the cleaning head of FIG. 6 (c) having a nozzle shape substantially equivalent to that of the cleaning head 60 shown in FIGS. 4 and 5
  • the bubbles in the cavitation move (propagate) and diffuse the washable area over a wide range.
  • factors such as pressure, flow rate, stand-off distance, and water depth of the tube sheet surface, it is possible to prevent erosion exceeding the allowable surface roughness (injection time 60 minutes).
  • a chamber 102 communicating with each nozzle chip is formed in the cleaning head 100, and high-pressure water is supplied from a high-pressure water hose 103 to the nozzle via the chamber 102. Supplied to chip 101, it generates cavitation as described above.
  • Reference numeral 104 denotes an image guide like a so-called optical fiber connected to the CCD camera 105 shown at the head end.
  • the cavitation is The bubble is generated in the throat portion 111 as shown by reference numeral 112. Therefore, the cleaning head 110 can be used not only in water but also in the air.
  • the corner on the tip side is not simply beveled but is formed into a curved portion 113.
  • the lance 58 can be moved along the cylindrical body 52a of the lance carrier 52 as indicated by the white arrow, so that when the lance 58 is completely pulled back.
  • the cleaning head at the tip is located inside the end cover 52b of the cylindrical body.
  • the scale removing device 50 is carried in and out of the body from the handhole 2b. Therefore, as shown in FIG. 8, if the corner of the cleaning head 110 is set to the curved surface portion 113, There is no interference with the handhole 2b during loading and unloading, improving workability.
  • the curved surface portion 113 is adapted to the outer peripheral shape of the end cover 52 b of the cylindrical main body 52 a shown in FIG.
  • FIGS. 9 (a) to 9 (d) various cleaning heads or nozzle tips that can generate cavitation for use in the scale removing apparatus of the present invention will be described.
  • a first member 1 2 2 having a conical flow path 1 2 3 communicating with a space 1 2 1, and this flow path
  • the high-pressure water enters the conical flow passage 123 from the high-pressure water hose 122, and is jetted from there into the cylindrical flow passage 125, where the bottle 1 2 A cavitation occurs around 8.
  • a nozzle tip 125 is further provided in front of the flow path 125, even if the cleaning head 120 is used in the air, cavitation can be generated. it can
  • Figures 9 (b) and (c) show another orifice-type nozzle tip 130, 135, formed in a tapered, generally conical shape in front of a cylindrical channel or chamber 131
  • a conical flow path 13 3 having a relatively short length is formed at the tip of the conical flow path 13 2. It is thought that shortening the length of the channel 133 promotes the generation of cavitation in high-pressure water flowing from left to right in the figure.
  • the nozzle tip 130 and the nozzle tip 135 differ from each other in that the outer shape is different.
  • FIG. 9D shows a horn type nozzle tip 140.
  • High-pressure water is introduced into the horn-shaped flow path 141 from the right side of the nozzle tip 140, passes through the cylindrical chamber or the flow path 142, exits the conical flow path 144, and cabinates. appear.
  • an appropriate ultrasonic vibrator 144 is attached to the cylindrical flow path 142, generation of cavitation is promoted.
  • the ultrasonic transducer is used only in the modified embodiment shown in Fig. 9 (d). However, if it is desired to promote the cavitation, install it on the upstream side of the nozzle (the part before cavitation occurs). be able to. ⁇ ⁇ ,
  • a trunk, a tube plate and a plurality of tube support plates horizontally arranged in the trunk in a transverse direction of the trunk, and one end extending from the tube plate and extending along the tube plate.
  • a plurality of heat transfer tubes extending in a row through the respective tube support plates so as to define a tube lane in the body portion at the other end, and the body portion includes the tube sheet.
  • a scale removing device inserted from the handhole and applied to cleaning around the tube sheet holds a high-pressure water hose, A flexible lance movable with respect to the tube sheet and the heat transfer tube; and a cleaning head attached to a distal end of the flexible lance; a fluid passage communicating with the high-pressure water hose inside the cleaning head; Chan communicating with the fluid passage And a cavity generating nozzle hole communicating with the chamber, a cavity is generated when high-pressure water flows through the flexible lance, and a strong impact pressure is widened from the nozzle hole of the cleaning head.
  • the scale removing device is a suspension guide device horizontally disposed on the tube sheet, and is suspended by the suspension guide device, and is guided in a horizontal direction through the hand hole.
  • a lance carrier wherein the flexible lance is fed out and pulled back from the lance carrier through the lance carrier, and a tip end of the cleaning head has a body defining the handhole.
  • the lance carrier has a cylindrical body through which the flexible lance passes, and the tip of the cleaning head does not protrude from the peripheral surface of the cylindrical body when the flexible lance is completely pulled back. The same effect can be obtained even when the shape is set as described above.
  • the number of the cavitation generating nozzle holes may be one or two.
  • the descaling device according to the present invention may further include a trunk, a plurality of tube support plates horizontally arranged in the trunk in a transverse direction of the trunk, and a tube lane defined in the trunk.
  • a plurality of heat transfer tubes extending in a row through each of the tube support plates; and a pair of heat transfer tubes formed on the body in a diametrical manner directly above at least one of the tube support plates.
  • a steam generator in which a flow slot is formed in a portion corresponding to the tube lane of each of the tube support plates, wherein each of the tube support plates is inserted from the hand hole into a corresponding one of the tube support plates.
  • a scale removing device that moves up and down through the formed flow slot and cleans around the tube support plate, wherein a flexible lens that holds a high-pressure water hose and is movable with respect to the tube support plate and the heat transfer tube;
  • a cleaning head attached to a distal end of the flexible lance, wherein the cleaning head includes a fluid passage communicating with the high-pressure water hose, a chamber communicating with the fluid passage, and a cavity communicating with the chamber.
  • the cleaning head is provided with a head main body in which the fluid passage and the chamber communicating with the fluid passage are formed, and a detachably attached to the head main body.
  • a nozzle tip formed with the cavitation nozzle hole even if erosion due to cavitation occurs in the nozzle tip itself due to repeated use, Can be easily replaced with a new one, reducing maintenance costs.
  • the nozzle tip may include a hexahedron defining the cavitation generating hole, and a thin plate-like mounting extending from two opposing surfaces of the hexahedron excluding the surface having the small-diameter end and the large-diameter end of the cavitation generating hole. And a projection defining a flow path communicating with the small-diameter end of the cavity generation hole.
  • a recess having a contour corresponding to the shape of the nozzle tip is formed in the head body.
  • the nozzle tip is inserted into the recess and can be attached to the head body by the attachment portion, the nozzle tip can be formed in a small size, It is suitable for use by inserting it between heat transfer tubes that are closely arranged as described above. If a CCD camera is provided in the tip of the cleaning head, the cleaning operation can be performed while displaying and observing an image of the portion to be cleaned on a monitor outside the steam generator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

L'invention concerne un dispositif de détartrage utilisé afin d'enlever le tartre déposé à l'intérieur d'un générateur de vapeur de type échangeur thermique à calandre et tube, qui comprend un tuyau souple (58) lequel supporte une conduite d'eau à haute pression (91) et peut être déplacé par rapport à des plaques tubulaires, un tube supportant ces plaques, ainsi que des tuyaux de transfert de chaleur et une tête de lavage (60) appliqués au niveau de la pointe du tuyau souple, tuyau dans lequel la cavitation générant des trous de passage (99a, 99b) communiquant avec les conduites d'eau à haute pression sont formés dans la tête de lavage, des bulles d'air étant produites au moment du lavage et une pression d'impact produite lorsque ces bulles éclatent étant propagée de manière à éliminer le tartre sur une grande partie du générateur.
PCT/JP2000/000593 1998-08-06 2000-02-03 Dispositif de detartrage pour un generateur de vapeur WO2001057462A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP22344998A JP3986172B2 (ja) 1998-08-06 1998-08-06 蒸気発生器用スケール除去装置
DE60042400T DE60042400D1 (de) 2000-02-03 2000-02-03 Entkalkungsvorrichtung für dampferzeuger
CA002369481A CA2369481C (fr) 2000-02-03 2000-02-03 Dispositif de detartrage pour un generateur de vapeur
CN00805617A CN1130545C (zh) 2000-02-03 2000-02-03 用于蒸汽发生器的去除水垢装置及去除水垢的方法
US09/937,600 US6513462B1 (en) 1998-08-06 2000-02-03 Descaling device for steam generator
PCT/JP2000/000593 WO2001057462A1 (fr) 1998-08-06 2000-02-03 Dispositif de detartrage pour un generateur de vapeur
KR10-2001-7012557A KR100446826B1 (ko) 2000-02-03 2000-02-03 증기발생기용 스케일 제거장치
EP00902850A EP1170567B1 (fr) 2000-02-03 2000-02-03 Dispositif de detartrage pour un generateur de vapeur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP22344998A JP3986172B2 (ja) 1998-08-06 1998-08-06 蒸気発生器用スケール除去装置
PCT/JP2000/000593 WO2001057462A1 (fr) 1998-08-06 2000-02-03 Dispositif de detartrage pour un generateur de vapeur

Publications (1)

Publication Number Publication Date
WO2001057462A1 true WO2001057462A1 (fr) 2001-08-09

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ID=11735654

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Application Number Title Priority Date Filing Date
PCT/JP2000/000593 WO2001057462A1 (fr) 1998-08-06 2000-02-03 Dispositif de detartrage pour un generateur de vapeur

Country Status (6)

Country Link
EP (1) EP1170567B1 (fr)
KR (1) KR100446826B1 (fr)
CN (1) CN1130545C (fr)
CA (1) CA2369481C (fr)
DE (1) DE60042400D1 (fr)
WO (1) WO2001057462A1 (fr)

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CN104180711A (zh) * 2013-05-22 2014-12-03 天津市通洁高压泵制造有限公司 一种蒸发器自动清洗系统
CN107175228A (zh) * 2016-03-10 2017-09-19 核动力运行研究所 蒸汽发生器二次侧第一支撑板下表面水力冲洗导向装置

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KR100565534B1 (ko) 2004-11-04 2006-03-30 엘지전자 주식회사 스팀 오븐의 스케일 제거 장치
KR101497117B1 (ko) * 2007-09-03 2015-03-03 고꾸리츠 다이가꾸 호우징 오까야마 다이가꾸 표면 처리 방법 및 그 장치
US10099264B2 (en) 2008-02-11 2018-10-16 Ecolab Usa Inc. Bubble enhanced cleaning method and chemistry
PL2409107T3 (pl) * 2009-03-16 2018-11-30 Michael Watson Lanca do czyszczenia strony powłoki rdzenia wymiennika ciepła
GB2489909A (en) * 2011-03-28 2012-10-17 Tube Tech Int Ltd Apparatus suitable for cleaning an exterior of tubes of a heat exchanger
CN102364292B (zh) * 2011-11-01 2013-01-02 中国矿业大学 一种高压冲污的多管程壳管换热设备及方法
CN102401609B (zh) * 2011-11-17 2013-03-06 姬鄂豫 凝汽器换热管在线清洗装置
US9206380B2 (en) 2013-03-14 2015-12-08 Ecolab Usa Inc. Method of generating carbonate in situ in a use solution and of buffered alkaline cleaning under an enriched CO2 atmosphere
CN103353255B (zh) * 2013-06-04 2017-05-10 安徽华速机器人科技有限公司 一种凝汽器在线清洗机器人喷头反锁结构
CN103615880B (zh) * 2013-11-22 2015-04-22 广东美味鲜调味食品有限公司 一种酱渣烘干机的维护及修复方法
CN104266539B (zh) * 2014-10-11 2016-04-20 哈电集团（秦皇岛）重型装备有限公司 一种蒸汽发生器管板上管孔的高效清洁装置和清洁方法
CN104595882B (zh) * 2015-01-19 2016-06-08 浙江徐氏厨房设备有限公司 燃气蒸汽发生器除垢装置
RU2692748C2 (ru) * 2015-06-10 2019-06-27 Фраматом Гмбх Приспособление и способ для очистки внутренней зоны теплообменника
DE102015118615B3 (de) * 2015-10-30 2016-09-01 Areva Gmbh Flexible Lanze zum Bearbeiten oder Inspizieren eines Rohrbodens eines Dampferzeugers
CN110296632A (zh) * 2018-03-21 2019-10-01 国核电站运行服务技术有限公司 蒸汽发生器的清洁装置
CN110822406B (zh) * 2019-11-20 2021-05-14 苏州热工研究院有限公司 蒸汽发生器全管束淋洗系统及淋洗方法
EP4067739A1 (fr) 2021-03-29 2022-10-05 Conservator Tyche Beheer B.V. Procédé et dispositif de nettoyage et/ou d'inspection d'un four ou d'une chaudière

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CN104180711A (zh) * 2013-05-22 2014-12-03 天津市通洁高压泵制造有限公司 一种蒸发器自动清洗系统
CN107175228A (zh) * 2016-03-10 2017-09-19 核动力运行研究所 蒸汽发生器二次侧第一支撑板下表面水力冲洗导向装置

Also Published As

Publication number Publication date
EP1170567A1 (fr) 2002-01-09
DE60042400D1 (de) 2009-07-30
EP1170567A4 (fr) 2004-04-28
KR20010111290A (ko) 2001-12-17
CN1345410A (zh) 2002-04-17
EP1170567B1 (fr) 2009-06-17
CN1130545C (zh) 2003-12-10
KR100446826B1 (ko) 2004-09-04
CA2369481C (fr) 2006-03-28
CA2369481A1 (fr) 2001-08-09

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