JP2564914B2 - How to remove deposits on tube inner surface - Google Patents

Description

The present invention relates to a method for removing deposits on the inner surface of a tube, and particularly to dust, sludge and rust deposited on the inner surface of a tube such as a multi-tube heat exchanger having a large number of tubes. The present invention relates to a method for removing deposits such as water stains, which is suitable for removing deposits while the fluid is being passed through the tube.

[Conventional technology]

Conventionally, the removal of deposits on the inner surface of tubes such as heat exchangers, flues, and piping has been performed as follows. For example, in the case of a vertical heat exchanger, as shown in FIG. 3, first, the upper cover of the heat exchanger 10 is removed, and a person 30 rides on the upper part of the heat exchanger 10 and the handle is placed inside the tube 13.
Insert brush 12 with 11. Next, the handle of this brush 12
The person 30 holds 11 and the tube inside the tube 13 frequently
Reciprocating in the axial direction of 13
Was scraped off with a brush 12.

However, in the above method, when the tube 13 is provided vertically and the upside down of the entire device is high, the length of the handle 11 must be increased, which makes the operation difficult.

Further, when the apparatus is in operation in the above method, the upper cover is removed, and the brush 12 itself closes the inside of the tube, which impedes the flow of fluid in the tube 13. It was not possible to remove the deposit 14 while the device was operating.

Further, in the above method, when the number of tubes is large as in the heat exchanger 10, the brush 12 has to be inserted and withdrawn repeatedly for each tube, which is troublesome.

[Problems to be Solved by the Invention]

The present invention eliminates the above-mentioned drawbacks of the prior art, the height of the device, without being affected by the flow of the tube, it is possible to continuously remove the deposits on the inner surface of the tube even during operation of the device,
Moreover, it is an object of the present invention to provide a method for removing deposits on the inner surface of a tube that can be performed simultaneously even when the number of tubes is large.

[Means for solving the problem]

In order to achieve the above object, the present invention hangs a filament on each tube of a multi-tube heat exchanger in which a plurality of tubes are arranged in the vertical direction, and attaches the upper end of the filament to a drive means. , Reciprocating the linear object in the axial or radial direction of the tube by the driving means to generate a wave motion in the linear object, contact the generated wave crest with the inner surface of the tube, and vibrate and impact the tube. It is characterized in that the deposit adhered to the inner surface of the tube is peeled off by applying.

[Action]

Waves are generated in the filamentous object by reciprocating the upper end of the filamentous object hanging in the tube at a predetermined speed and a stalk, in the axial or radial direction of the tube. The wave front of this wave is
By reciprocating the upper end of the linear object in the axial direction or in the radial direction in a suspended state, the linear object is brought into periodic and continuous contact with the entire inner surface of the tube to give vibration and impact. As a result, the deposits on the inner surface of the tube are peeled off and removed.
In addition, wire rope, link chain,
Alternatively, if a weight is attached at predetermined intervals in the longitudinal direction, the vibration and impact force generated by the wave motion are large, and the deposit can be easily removed. Further, since the linear object is attached by providing the driving means inside the apparatus, it is not necessary to temporarily disassemble the apparatus.

Further, since the filamentous article has a small cross-sectional area, even if the filamentous article is penetrated into the tube, various pressure loss applied to the fluid in the tube is small, and the adhered matter can be removed even while the apparatus is in operation. Further, even when the number of tubes is large, the work of removing the adhering substances can be performed at the same time by hanging the filamentous object in each of the many tubes.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

 FIG. 1 is a sectional view showing the structure of an embodiment of the present invention.

The embodiment is the case of a vertical heat exchanger 10 installed vertically as shown in FIG. A wire rope 15 is hung as a linear object at a substantially central position in a plurality of tubes 13 vertically arranged inside the heat exchanger 10, and an upper end portion of the wire rope 15 is hung.
15a is attached to a driving device 16 which is a driving means. When the wire rope 15 is reciprocated by the driving device 15 at a predetermined speed and stroke at a high frequency in the axial direction or the radial direction of the tube 13, the wire rope 15 causes a wave like a two-dot chain line in the figure. By bringing the wave crest 17 generated by this wave into contact with the inner surface 13a of the tube 13, periodic and continuous vibration and impact are applied to the deposit 14 on the inner surface of the tube 13, so that the deposit 13 can be separated and removed. The wire rope 15 used in this embodiment is assumed to have a diameter d that is considerably smaller than the inner diameter D of the tube 13 in order to easily cause waves. Therefore, even if the heat exchanger 10 is in operation and the fluid flows through the tube 13, since the cross-sectional area of the wire rope 15 is small, various pressure losses given to the fluid are small. As a result, the deposit 14 on the inner surface of the tube 13 can be removed even while the apparatus is in operation. Note that the driving device 16 may be provided outside instead of being provided inside the heat exchanger 10 as shown in order to reduce pressure loss of the fluid, and only the reciprocating motion transmission means may be provided inside the heat exchanger 10. Also, the direction of reciprocation by the drive device 16,
The speed, stroke, and frequency allow the amplitude and frequency to be adjusted by the inner diameter D and length of the tube 13.

As described above, according to the present embodiment, the wire rope 15 is hung on the inner surface of the tube 13, and the wire rope 15 is oscillated by the driving device 16, whereby the adhered matter on the inner surface of the tube 13 can be peeled and removed. Moreover, the removal operation can be performed when the fluid is passing through the tube 13, that is, even during operation. Further, even if the number of tubes is large like the heat exchanger 10, it can be done at the same time.

In this embodiment, the wire rope 15 is used as the filament, but this is a link chain as shown in Fig. 2 (I).
Alternatively, a rope 21 having a plurality of weights 20 attached at predetermined intervals L in the lengthwise direction of the linear object as shown in FIG. As described above, by providing a projection 22 having a certain weight on the linear object, when the wave front 17 of the wave indicated by the two-dot chain line in FIGS. 2 (I) and (II) matches the projection 22, the tube 13 The vibration and impact force applied to the inner surface increases and
Are easily peeled off.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

The filamentous object is hung in the tube, and the upper end of the filamentous article is reciprocally moved in the axial direction or the radial direction of the tube by the driving means. It can be cleaned even while the multi-tube heat exchanger is in operation, and even if there are many tubes, they can be easily peeled and removed at the same time.

Further, by reciprocating the upper end of the linear object hanging in the tube in the axial or radial direction of the tube, the wave front of the wave generated in the linear object can be brought into contact with substantially the entire surface of the tube. Therefore, the peeling effect can be made extremely high.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of an embodiment of the present invention, FIGS. 2 (I) and (II) are cross-sectional views showing the outer shape of a filamentous material according to the embodiment, and FIG. 3 is a cross-sectional view showing a conventional example. It is a figure. 10 …… Heat exchanger, 13 …… Tube, 14 …… Adhesive matter, 15 …… Wire rope, 16 …… Drive unit, 17 …… Crest.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeo Arimitsu 1-1-14, Uchikanda, Chiyoda-ku, Tokyo Hiroyuki Ishida, Examiner, Hitachi Plant Construction Co., Ltd. (56) References: Sho 49-6864 (JP) , U) Actual opening Sho 57-169488 (JP, U) Actual opening Sho 50-42579 (JP, U) Actual opening Sho 63-90440 (JP, U) Actual opening Sho 63-82436 (JP, U) Japanese Patent Sho 49-16983 (JP, B1) Actual public Sho 32-11886 (JP, Y1)

Claims (3)

(57) [Claims] 1. A filamentous article is hung in each of the tubes of a multi-tube heat exchanger in which a plurality of tubes are arranged in the vertical direction, and the upper end of the filamentous article is attached to a drive means to attach the filamentous article. The driving means reciprocates in the axial direction or the radial direction of the tube to generate a wave motion in the linear object, and the generated wave front is brought into contact with the tube inner surface to give vibration and impact to the tube to thereby generate the tube inner surface. A method for removing deposits on the inner surface of a tube, characterized in that the deposits attached to the surface are removed. 2. A wire rope or a ring chain is used as the filamentous article.
The method for removing deposits on the inner surface of a tube as described. 3. The tube inner surface adhered substance according to claim 1, wherein a plurality of weights are attached as the filaments at predetermined intervals in the lengthwise direction of the filaments. Removal method.