JPS6211586A - Method of removing attachment in tube and polishing and cleaning material for attachment in tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for removing deposits such as scale and dirt generated on the inner surface of heat exchanger tubes in, for example, a heat exchanger. The present invention also relates to an abrasive material that is forcibly fed through the heat transfer tube in order to remove the deposits in the method.

[Prior Art] For example, when a heat exchanger is used for a long period of time, deposits such as scale and dirt are formed on the inner surface of the heat exchanger tubes, which sometimes deteriorates the performance of the heat exchanger.

Conventionally, mechanical cleaning, water jet cleaning, chemical cleaning, and the like have been known as methods for removing the deposits inside the pipe, but wet sandblasting and dry sandblasting are widely used as simpler methods.

In wet sandblasting, a liquid containing an abrasive dispersed therein is injected into a pipe at high speed, and the deposits are removed by the abrasive carried by the kinetic energy of the liquid. In addition, dry sandblasting is a method in which an abrasive is carried by a gas flow and sprayed into the pipe to remove the deposits.

[Problems to be Solved by the Invention] However, in the wet sandblasting method, the abrasive material for removing deposits is dispersed in the pressurized fluid injected into the pipe, so the energy of the pressurized fluid is There is a problem in that only a small portion of the energy is transmitted to the abrasive material, and most of the energy does not work effectively for removing deposits. Therefore, there was a problem in that the ability to remove deposits was low and the work efficiency was poor.

In addition, the dry sandblasting method has the problem that the flow rate of the pressurized fluid is high, and it is difficult to adjust the amount of abrasive dispersed in the fluid, which tends to generate two lotions on the inner wall of the pipe. there were.

Furthermore, in both of the above-mentioned methods, since the abrasive remains in the tube after the blasting operation, there is a problem in that the abrasive must be removed separately.

[Objective of the Invention] In order to solve the above-mentioned problems, the present invention provides a method for removing deposits inside a pipe, which can efficiently remove deposits inside the pipe and eliminate the risk of causing erosion on the inner surface of the pipe. The purpose of the present invention is to provide a method for removing deposits inside a pipe. Further, the present invention efficiently removes deposits by using the energy of pressurized fluid supplied into the pipe, and
It is an object of the present invention to provide an abrasive material for deposits inside a pipe that does not require cleaning work of the abrasive material after removal work.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides (1) a method for removing deposits inside a pipe, in which cleaning ice is placed at the rear end of polished wood holding an abrasive inside. After inserting the abrasive material provided with the abrasive material from the open end of the pipe, pressurized fluid is supplied into the pipe to forcibly feed the abrasive material within the pipe, thereby eliminating deposits inside the pipe. (2) An abrasive material for deposits inside a pipe that is forcibly fed by fluid pressure through the inside of a pipe having deposits on the inner wall surface to remove the deposits, The ice material is characterized by being constructed by providing a cleaning ice material at the rear end of an ice material that holds an abrasive material inside.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 0, l is a tube having deposits such as scale on the inner surface. First, the ice body 2 is inserted from one open end 1a of the tube 1. The ice body 2 is a cylinder-shaped ice whose outer diameter is slightly smaller than the inner diameter of the tube l. The length is 2
Those with C■ to 10c■ are preferred.

Next, the abrasive material 3 is inserted through the opening end 1a, and the front end surface of the abrasive material 3 is brought into contact with the rear end surface of the ice body 2.

The abrasive material 3 is a cylindrical member, and its outer diameter is set to be slightly smaller than the inner diameter of the tube 1.

Further, the abrasive material 3 has a front portion made up of an abrasive wood 5 holding an abrasive material 4 therein, and a rear portion thereof made up of a cleaning ice material 6 made of ice that does not contain an abrasive material inside. and 1
Both are integrally molded, and the length of the polished wood 5 is preferably about twice the length of the cleaning ice material 6.

This abrasive material 3 can be produced by putting an abrasive material and water in a cylindrical cup-shaped container with one end closed and freezing the mixture. In this case, the abrasive material is 5 for blasting.
It is better to use No. 1 sand, and the length of the abrasive material 3 is 10 to 30 cm.
m is preferable in terms of cleaning efficiency.

Next, the pipe 1 and the reserve tank 7 serving as pressurized fluid supply means are connected at the open end 1a. The reserve tank 7 is connected and communicated with a near compressor (not shown), so that compressed gas can be supplied as needed. A flexible connecting hose 8 is connected to the reserve tank 7 , and the connecting hose 8 is connected to a connecting pipe 10 via a valve 9 .

The connection port 10a of the connection pipe 10 is connected via a sealing material 11 made of, for example, rubber.

It is connected to the open end 1a of the tube 1. As shown in FIG. 1, the connection between the pipe 1 and the connecting pipe 10 is made by a worker W
This is done by supporting O by hand, but depending on the pressure of the compressed gas used, a fixed structure that can be easily attached and detached may be adopted.The operating pressure is 5 kg/cm'
It is preferable to set the gauge pressure to 10 kg/crn'' gauge pressure.

Next, in the above state, the cock 9a of the valve 9 is twisted in the opening direction to release the compressed gas in the reserve tank 7 from the rear side of the abrasive material 3 into the inside of the pipe 1. The compressed gas that has entered the inside of the tube 1 pushes the cleaning ice material 6, so the abrasive ice material 5
is compressed between the ice body 2 and the cleaning ice material 6 and tightly adheres to the inner surface of the tube 1.

Then, the abrasive material 3 passes through the inside of the tube 1 together with the ice body 2 at high speed.

At this time, if there is a blockage inside the tube 1, the ice body 2 at the tip in the moving direction removes it.

Further, the polishing ice material 5 is moved by being reliably transmitted with the pressure of the compressed gas via the cleaning ice material 6.

Therefore, the abrasive material 4 held by the abrasive ice material 5 effectively utilizes the energy of the compressed gas to remove deposits such as scale and dirt, and the abrasive ice material 5 removes the deposits one after another. The cleaning ice material 6, which gradually breaks apart as it removes the deposits, advances while pushing the abrasive material 4 after removing the deposits and the removed deposits forward under the force of the compressed gas. go. Eventually, the ice body 2 and the abrasive material 3 reach the open end of the tube 1, and one cycle of the removal operation is completed. At this time, although the polishing ice material 5 has collapsed, it is all discharged out of the tube by the cleaning ice material 6.

By repeating the above operations a required number of times depending on conditions such as the condition of the deposit, the inner diameter of the pipe 1, and the pressure of the compressed gas, the deposit inside the pipe can be efficiently and reliably removed. Moreover, since the ice body 2 is used in the first operation, only the abrasive material 3 needs to be force-fed into the pipe in the second and subsequent removal operations.

Also, the amount of abrasive material 4 held by abrasive ice material 5 is as follows.

It can be arbitrarily set in advance according to the various work conditions mentioned above. Therefore, even if the removal operation is repeated, there is no risk of erosion occurring on the inner surface of the tube 1.

[Effects of the Invention] As explained above, according to the method for removing deposits inside a pipe according to the present invention, an abrasive material in which a cleaning ice material is provided at the rear end of the abrasive ice material that holds an abrasive material inside. is inserted from the open end of the tube, and the abrasive material is forcibly fed into the tube by the pressurized fluid supply means to remove deposits, so that no erosion occurs on the inner surface of the tube. This has the effect that it is possible to efficiently remove deposits inside the pipe. Furthermore, since the abrasive material and removed deposits are discharged to the outside by the pressure of the pressurized fluid and the cleaning ice material, there is an advantage that there is no need to clean the pipe again.

Moreover, as explained above, according to the abrasive material for cleaning deposits inside a pipe according to the present invention, the abrasive material has a structure in which the cleaning ice material is provided at the rear end of the abrasive ice material that holds the abrasive material inside. It's Toshide.

Therefore, the same effects as described above can be obtained in the work of removing deposits inside the pipe by forcing the abrasive material into the pipe using fluid pressure.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view showing one embodiment of the present invention;
The figure is a partially cutaway enlarged perspective view of part 11 in FIG. 1. 1... Pipe, 3... Abrasive material, 4... Abrasive material, 5...
- Polishing ice material, 6... Cleaning ice material, 7... Reserve tank as pressurized fluid supply means, 10a... Connection port.

Claims (2)

[Claims] (1) In a method for removing deposits inside a pipe, an abrasive material having a cleaning ice material provided at the rear end of an abrasive ice material holding an abrasive material inside is inserted from one open end of the pipe, and then processed. A method for removing deposits inside a pipe, characterized in that deposits inside the pipe are removed by supplying pressurized fluid into the pipe and forcibly feeding the abrasive material inside the pipe. (2) A rear end of the abrasive ice material that holds the abrasive material inside in an abrasive material for abrasive materials inside a pipe that is forcibly fed through the inside of a tube having deposits on the inner surface by fluid pressure to remove the deposits. An abrasive material for cleaning deposits inside a pipe, characterized in that a cleaning ice material is provided in the pipe.