JP2552588Y2 - Heat exchanger tube cleaning device for heat exchanger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger cleaning device for a heat exchanger used for various industrial heat exchangers, such as a steam generator of a nuclear power plant, for removing scale adhering to the outer surface of the heat exchanger. .

[0002]

2. Description of the Related Art For example, in the case of a steam generator of a nuclear power plant, scales are generated on the outer surface of a heat transfer tube during long-term use. This scale is formed by solidification of water impurities adhered to the heat transfer tube, and promotes corrosion of the heat transfer tube. Therefore, it is necessary to remove this.

[0003] Conventionally, as a method of removing this scale,
Although chemical cleaning and fluid cleaning have been used with some success, they may not be sufficient for thick scales firmly attached to the heat transfer tubes. For this reason, it is desired to mechanically remove such firmly attached scale with a brush or the like. Is not yet reached.

[0004]

As described above, chemical cleaning or fluid cleaning is not sufficient for a thick scale firmly adhered to a heat transfer tube, and a mechanical removal device such as a brush is realized. For this purpose, there are the following issues. 1. It is necessary to clean the entire circumference of the heat transfer tubes arranged with a small gap. 2. It is necessary to efficiently clean all the heat transfer tubes arranged in large numbers. 3. When a brush is used to remove a firmly attached thick scale, it is necessary to support a strong reaction force of the brush. 4. There is a need for a lightweight and high-strength moving mechanism that can move through the narrow gap between the heat transfer tubes. 5. The tube group of the heat transfer tubes to be cleaned is far from the entrance of the heat exchanger shell inspection hole, so it is necessary to reach a path through the narrow water passage opening of the tube plate on the way. It is necessary to attach the device to the heat transfer tube row.

The present invention solves such a problem, and provides a heat exchanger tube cleaning device for a heat exchanger in which scale attached to the heat exchanger tube is surely removed and the work efficiency of the cleaning operation is improved. The purpose is to:

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a heat exchanger tube cleaning device for a heat exchanger according to the present invention is held by a guide device and carried in parallel from an inspection hole of the heat exchanger. In a heat exchanger tube cleaning device for a heat exchanger guided and held between heat exchanger tubes, the guide device includes a guide rod,
Flexible guide movably mounted in a rod
The bar and the grip attached to the tip of the guide bar
The guide device includes a frame held by the guide device, a wire brush rotatably mounted on the frame, a motor for rotating the wire brush, and a frame. And a cleaning device comprising a pair of clamps mounted on the air-conditioner and capable of expanding and contracting by supplying and discharging air, and an air cylinder for moving the clamps along the longitudinal direction of the heat transfer tube.

[0007] The cleaning device is carried out of the inspection hole of the heat exchanger while being held by the guide device, and is guided between a plurality of heat transfer tubes arranged in parallel. The frame is held in the gap between the heat transfer tubes by expanding the clamp by the supply of air. From this state, the scale attached to the heat transfer tube is removed by rotating the wire brush with a motor. Furthermore,
At the same time, air is supplied to and exhausted from the pair of clamps in order to hold and release the heat transfer tubes, and the clamps released from holding the heat transfer tubes are moved by the air cylinder along the longitudinal direction of the heat transfer tubes. Thus, the cleaning device can be moved to clean the entire length of the heat transfer tube. Furthermore, the guidance device
With the cleaning device held by the grip,
The guide bar to extend the guide bar
By holding the cleaning device,
Positioning by passing through the appropriate inspection holes and water passage openings
Can be.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view of an apparatus for cleaning a heat exchanger tube of a heat exchanger according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG.
4 is a perspective view showing a state where the heat transfer tube cleaning device is supported by the guide device, FIG. 4 is a perspective view showing a state where the heat transfer tube cleaning device is attached to the heat transfer tube, FIG. 5 is a cross section showing operation of the clamp, and FIG. 2 shows a cross section of FIG.

As shown in FIGS. 1 and 2, in a heat exchanger tube cleaning apparatus 10 for a heat exchanger according to the present embodiment, a frame 11 is formed by combining a pair of a vertical frame 12 and a horizontal frame 13 which are parallel to each other. It is configured in a square shape. Two rotating shafts 14 and 15 parallel to each other so as to be bridged between the pair of vertical frames 12.
Are rotatably mounted, and each of the rotating shafts 14 and 15 has a flat wire brush 1 having a waveform extending in two directions along the axial direction.
6, 17 are fixed. Drive gears 18 and 19 that mesh with each other are fixed to the ends of the rotating shafts 14 and 15 of the wire brushes 16 and 17, and the drive shafts of the air motors 20 and 21 are directly connected.

An air cylinder 23 having a piston rod 22 which can protrude outward is attached to one lateral frame 13 of the frame body 11 at the longitudinal end thereof.
Are connected to the ends of the clamps 24 respectively. This clamp 24 is a rubber pack type, and expands or contracts by supplying and discharging air to the inside,
The position can be maintained or moved in a gap between a large number of heat transfer tubes 101 described later. A plurality of grooves 25 are formed on one side of the clamp 24 in accordance with the distance between the heat transfer tubes 101.

On the other hand, an air cylinder 26 is similarly attached to each end of the other horizontal frame 13 of the frame 11, and an end of a clamp 28 is connected to a tip of each piston rod 27, respectively. A plurality of grooves 29 are also formed in the clamp 28 in accordance with the interval between the heat transfer tubes 101.

That is, as shown in FIG. 5, each of the clamps 24 and 28 has a structure in which clamp plates 31 are fixed to both sides of an elastic rubber pack 30 and an air supply / discharge pipe 32 is provided at one end.
Is installed. An air pump (not shown) or the like is connected to the air supply / discharge pipe 32, and the expansion or contraction of the clamps 24, 28 can be controlled by supplying / discharging air into / from the rubber pack 30. I have.

Here, a steam generator of a nuclear power plant for cleaning by the above-described heat transfer tube cleaning device 10 and a guide device for mounting the cleaning device 10 in the steam generator will be described. As shown in FIG. 3, a steam generator of a nuclear power plant is a type of a multi-tube cylindrical heat exchanger that evaporates secondary water by heat exchange with primary water heated in a nuclear reactor, and is not shown. The lower part inside the cylindrical shell is partitioned by a horizontal tube sheet to form a hemispherical water chamber. A plurality of heat transfer tubes 101 extending in a U-shape penetrate the tube plate, and the ends of the heat transfer tubes 101 open in the water chamber.
02 is supported on the cylindrical shell. In addition, an inspection hole 103 is formed in a lower portion of the cylindrical shell, and a water passage opening 104 is also formed in the support plate 102.

Further, in the guide device 41, the guide rod 42 whose base end is mounted on the mounting jig has an L-shape and has a length of about 1/2 of the trunk diameter of the cylindrical shell of the heat exchanger. It can be inserted from the inspection hole 103 into the inside. A flexible guide bar 43 is movably mounted inside the guide rod 42, and a support base 44 is attached to a distal end portion of the guide bar 43. A grip 46 is mounted on one end of the support base 44 via a vertically supported rotating shaft 45. On the other hand, a vertically supported telescopic cylinder 47 is attached to the other end of the support base 44, and a horizontal telescopic cylinder 49 is mounted to the tip of the telescopic cylinder 47 via a rotation support part 48. A grip 50 is rotatably mounted on the tip of the cylinder 49.

As shown in FIG. 6, an elastic rubber pack 52 and a clamp plate 53 are mounted on both sides of a grip frame 51 having a U-shape, as shown in FIG. A rubber pack 54 and two clamp plates 55 are mounted, and an air pump (not shown) is connected to each of the rubber packs 52 and 54. Therefore, by supplying and discharging air into and out of the rubber packs 52 and 54 and expanding or contracting the rubber packs 52 and 54 , the gap between the opposing clamp plates 53 and 55 can be reduced. ing. It should be noted that, although not shown, glyceraldehyde
The tip 46 has a similar structure.

The operation of removing the scale of the heat transfer tubes 101 of the steam generator of the nuclear power plant using the heat transfer tube cleaning device 10 and the guide device 41 thus configured will be described.

First, as shown in FIG. 3, with the grip 46 of the guide device 41 holding the cleaning device 10, the guide rod 42 is inserted from the inspection hole 103 into the inside, and the guide bar 43 is extended upward to pass through. The water enters the upper part from the water opening 104. Generally, the inspection hole 103 of the steam generator is used.
Although it depends on the dimensional relationship with the cleaning device 10, the curved portion of the guide device 41 may be bent or stretched or bent. That is,
The L-shaped portion of the guide rod 42 and the connecting portion between the support base 44 and the guide bar 43 can be fixed to hinges and pins.

Next, with the cleaning device 10 inserted inside the steam generator, the cleaning device 10 held by the grip 46 is changed to the grip 50. That is, the cleaning device 10 is rotated by 90 ° by the rotation shaft 45 from the state shown in FIG. 3, the telescopic cylinder 49 is operated to extend the grip 50, and as shown in FIG. 4, the cleaning device 10 is held by the grip 50. . At the same time, the holding by the grip 46 is released.

Then, the grip 50 is rotated by 90 ° by the rotation supporting portion 48, and as shown by a two-dot chain line in FIG. 4, the cleaning device 10 is tilted to be positioned in the gap between the heat transfer tubes 101 arranged in a large number. At this time, each of the clamps 24 and 28 of the cleaning device 10 has a reduced pressure in the rubber pack 30 as shown in FIG. I have. Also, wire brushes 16 and 17
Are located in the vertical direction so as not to contact the heat transfer tube 101. In addition, the positioning of the cleaning device 10 with respect to the gap between the large number of heat transfer tubes 101 is performed by the telescopic cylinders 47 and 4.
9 is performed.

Next, the cleaning device 10 positioned in the gap between the heat transfer tubes 101 is held in position on the heat transfer tubes 101. That is, as shown in FIG. 5C, air is supplied into the rubber pack 30 of each of the clamps 24 and 28 via the air supply pipe 32 to expand the air, and the opposing clamp plates 31 are moved outward. . Then, the groove 2 of each clamp 24, 28
The cleaning devices 10 are held by the heat transfer tubes 101 while being pressed against the outer peripheral surface of the heat transfer tubes 101. Thereafter, the grip 50 of the guide device 41 is released and retracted.

With the cleaning device 10 held by the heat transfer tube 101 in this manner, scale is removed while moving the cleaning device 10 up and down with respect to the heat transfer tube 101. First, the air motors 20 and 21 are driven to rotate the rotary shafts 14 and 15.
By rotating, the wire brushes 16 and 17 are turned. At this time, the wire brushes 16 and 17 are
Since the drive gears 18 and 19 fixed to 15 mesh with each other, they can be turned synchronously. In addition, the wire brushes 16 and 17 rotate in opposite directions to cancel the reaction force acting on the rotating shafts 14 and 15 and the frame 11.

Next, as shown in FIG. 5B, when the air in the rubber pack 30 of the clamp 28 is released to the atmosphere and contracted while the wire brushes 16 and 17 are turned, the clamp plate 31 is transmitted. Move away from heat tube 101. Then, the air cylinder 26 is operated to extend the piston rod 27 to move the clamp 28 downward. At the time of the movement, as shown in FIG. 5C, air is again supplied into the rubber pack 30 of the clamp 28 to expand it, and the clamp plate 31 is moved outward to be pressed against the heat transfer tube 101. . Then, by operating the air cylinder 23 to extend the piston rod 22 and operating the air cylinder 26 to contract the piston rod 27, only the frame 11 is moved downward. Thereafter, the clamp 24 is moved downward by operating the air cylinder 23 to contract the piston rod 22, and air is again supplied to the clamp 24 to expand it and press against the heat transfer tube 101, whereby the cleaning device 10 transmits the air. Heat tube 10
It is held at 1.

Therefore, the cleaning device 10 moves downward by one stroke of each of the air cylinders 23 and 26, and
01 is cleaned. Then, by repeating this operation, it is possible to remove the scale on only one side of the outer circumference over the entire length of the adjacent heat transfer tube 101 to perform cleaning, and to clean the tube row of the adjacent heat transfer tube 101 in the next step to clean the heat transfer tube 101. Cleaning can be performed by removing the entire circumference scale over the entire length. Note that the cleaning device 10 is a heat transfer tube 101
When the wire brushes 16 and 17 are stopped by the air motors 20 and 21 when moving from the upper part to the lower part along the longitudinal direction of the cleaner, the stop phase shift position of the wire brushes 16 and 17 is transferred to the heat transfer tube 101 when the cleaning device 10 moves. It is a position facing up and down without contact, that is, the same position as when the cleaning device 10 is carried into the steam generator.

When the operation of removing the scale of the heat transfer tube 101 is completed by the operation of the cleaning device 10 as described above, the cleaning device 10 is carried out of the steam generator by the guide device 41. That is, after the cleaning device 10 is held by the grip 50 and is erected from the horizontally raised state (the two-dot chain line in FIG. 4) (solid line in FIG. 4), the grip 46 is changed and rotated by 90 ° (FIG. 3). From this state, the guide bar 43 is contracted and the cleaning device 10 is pulled out from the water opening 104 to the lower portion,
The cleaning device 10 is carried out by pulling out the guide rod 42 from the inspection hole 103.

By rotating the wire brushes 16 and 17 by the air motors 20 and 21 in this manner, the heat transfer tubes 1
As a result, the scale attached to the heat transfer tube 101 can be removed, and the air is supplied to and discharged from the pair of clamps 24 and 28 in order to hold and release the heat transfer tube 101.
By moving the clamps 24 and 28 along the longitudinal direction of the heat transfer tube 101 by the air cylinders 23 and 26, the cleaning device 10 can be moved to remove scale over the entire length of the heat transfer tube 101.

As described above in detail with reference to the embodiments, according to the heat exchanger tube cleaning device of the heat exchanger of the present invention, the heat exchanger tubes are held by the guide device, carried in from the inspection hole of the heat exchanger, and juxtaposed. In a heat exchanger cleaning device for a heat exchanger guided and held between heat exchanger tubes, a wire brush is rotatably mounted on a frame body held by the guide device, and the wire brush is rotatably driven by a motor. A pair of clamps that can be expanded and contracted by supplying and discharging air are attached to the body, and the clamps are movably supported along the longitudinal direction of the heat transfer tube by an air cylinder. It can move smoothly along the arranged heat transfer tubes and reliably remove the scale adhering to the heat transfer tubes to efficiently clean the entire circumference, improving the cleaning work efficiency. Can. Further, in the present invention, the guide device
Can be moved freely within the guide rod and the guide rod
Flexible guide bar mounted on a guide bar
With the grip attached to the tip of the
With the cleaning device held by the grip of the guiding device,
Insert the guide rod through the inspection hole
By extending, the cleaning device is held
For positioning by passing through narrow inspection holes and water passage openings.
can do. Therefore, according to the present invention,
Of heat transfer tubes from the inlet of the inspection hole of the heat exchanger shell
It is far away, and there are narrow inspection holes and water
In the steam generator of the nuclear plant where the mouth exists
It is a very effective cleaning device for cleaning.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat exchanger tube cleaning device of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view illustrating a state in which a heat transfer tube cleaning device is supported by a guide device.

FIG. 4 is a perspective view illustrating a state where the heat transfer tube cleaning device is attached to the heat transfer tube.

FIG. 5 is a sectional view showing the operation of the clamp.

FIG. 6 is a sectional view of a grip of the guide device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cleaning device 11 Frame body 14, 15 Rotation shaft 16, 17 Wire brush 18, 19 Drive gear 20, 21 Air motor 23, 26 Air cylinder 24, 28 Clamp 41 Guide device 101 Heat transfer tube 103 Inspection hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A held in the guide device in the heat transfer tube cleaning device of a heat exchanger is guided held between and conveyed through the sight hole of the heat exchanger juxtaposed heat transfer tubes, the guide device has a guide Rod and inside this guide rod
A flexible guide bar movably mounted on the
With a grip attached to the tip of the guide bar.
It is, the guide device includes a frame body which is held in the guide device,
A wire brush rotatably mounted on the frame, a motor for rotating the wire brush, a pair of clamps mounted on the frame and capable of expanding and contracting by supplying and discharging air; A heat exchanger tube cleaning device for a heat exchanger, comprising a cleaning device comprising an air cylinder moved in a direction.