JP2016024028A - Specifying method of perforated point in vertical multi-pipe type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for accurately specifying a perforated position of a tube, a partitioning plate or the like in a vertical multi-pipe type heat exchanger.SOLUTION: In a vertical multi-pipe type heat exchanger in which a cylindrical vessel is partitioned into an upper chamber, an intermediate chamber and a lower chamber which are aligned in an axial direction by a partitioning plate, and the upper chamber and the lower chamber which sandwich the intermediate chamber are made to communicate with each other by one or more tubes, the inside of the tube is filled with liquid by being supplied with the liquid from an opening of the tube which opposes the upper chamber or the lower chamber, after that, a floating measurement instrument is floated on a liquid level by inserting the floating measurement instrument into the tube in which the liquid level of the liquid is lowered, a distance from the opening of the tube up to the liquid level is measured by using the floating measurement instrument, and a perforated point in the vertical multi-pipe type heat exchanger is specified by using the measured distance.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a method for easily and reliably specifying a hole in a tube or a partition plate in a heat exchanger that exchanges heat by bringing fluids having different temperatures into contact with each other via a tube (heat transfer tube). Is.

  Multi-tube heat exchangers have various uses such as steam generators, heaters, superheaters, water heaters, coolers, and condensers. Especially, the tubes (heat transfer tubes) are arranged in the vertical direction. The vertical type multi-tube heat exchanger in which is arranged is suitable for installation in a narrow place.

  For example, as shown in FIG. 1, the vertical multitubular heat exchanger is formed of a (circle) cylindrical container 1 in an airtight or liquid-tight manner in three chambers 2 to 4 arranged in the axial direction by partition plates 1a and 1b. A plurality of upper chambers 2 and lower chambers 4 that are partitioned below and sandwich the intermediate chamber 3 are communicated with each other by three tubes 5a to 5c in the illustrated example. Then, for example, the fluid A is introduced into the upper chamber 2 through the inlet 20, and the fluid A is passed through the tubes 5 a to 5 c to form the path of the fluid A from the lower chamber 4 to the outlet 40. The fluid B is introduced into the intermediate chamber 3 through the inlet 30 and leads to the outlet 31. While the fluids A and b are passed through the two paths, heat exchange is performed between the fluid A and the fluid B by heat transfer through the tubes 5a to 5c.

In the above-described vertical multi-tube heat exchanger, a steel tube having an outer diameter of about 40 mm and an inner diameter of about 30 mm is used as a tube serving as a heat transfer tube. Moreover, high temperature ammonia etc. may be used as a fluid, therefore it is often used in a corrosive environment.
As described above, the usage environment of the heat exchanger is severe. Particularly, since the environment where the tube is placed is harsh, it is difficult to avoid perforation in the tube, and it is necessary to repair each time.

  Here, when perforation occurs in the tube, “appropriate and efficient first aid” is required. Therefore, it is important to periodically inspect the tube for holes. In this inspection, the above-described intermediate chamber 3 is filled with water, a flashlight or the like is applied to the inside of the tube, and the bleeding of the water from the tube is visually confirmed to determine an approximate hole portion of the tube. It was done in.

  However, since the method of identifying the perforated spot is visual observation with a flashlight, it is inferior in accuracy because it is dark, and as a result, appropriate and efficient emergency treatment cannot be performed. Repeated operations are forced to stop.

  An object of the present invention is to provide a method for accurately specifying the positions of holes such as tubes and partition plates in a vertical multi-tube heat exchanger.

The gist configuration of the present invention is as follows.
1. A cylindrical container is divided into an upper chamber, an intermediate chamber, and a lower chamber arranged in the axial direction by a partition plate, and the upper chamber and the lower chamber sandwiching the intermediate chamber are connected by one or more tubes. Type multi-tube heat exchanger
Supplying the liquid from the opening of the tube facing the upper chamber or the lower chamber to fill the inside of the tube with the liquid,
Thereafter, the float type measuring instrument is floated on the liquid level by inserting a float type measuring instrument into the tube where the liquid level of the liquid is lowered,
Measuring the distance from the opening of the tube to the liquid level using the float measuring instrument,
Identifying the perforated point in the vertical multi-tube heat exchanger with the measured distance;
A method for identifying perforated points in a vertical multi-tube heat exchanger characterized by the above.

2. 2. The method for identifying a perforated portion in the vertical multitubular heat exchanger according to 1 above, wherein the liquid is water.

  ADVANTAGE OF THE INVENTION According to this invention, the position of perforations, such as a tube and a partition plate, in a vertical multi-tube heat exchanger can be pinpointed correctly.

It is sectional drawing which shows a vertical multi-tube heat exchanger. It is a figure explaining the method of pinpointing the position of the hole of the tube in a vertical type multi-tube heat exchanger. It is a figure explaining the method of pinpointing the position of the hole of the tube in a vertical type multi-tube heat exchanger.

Below, the procedure which pinpoints the position of perforations, such as a tube and a partition plate in a vertical multi-tube heat exchanger, is demonstrated concretely.
The vertical multi-tube heat exchanger shown in FIG. 1 has a cover 21 that forms an outline of the upper chamber 2 detachable with respect to the exchanger main body 32. The cover 21 is removed from the exchanger main body 32 and each tube opened to the partition plate 1a also exposes the end face. Here, liquid, for example, water is supplied to the inside of each tube from the openings of the tubes 5a to 5c arranged on the surface of the partition plate 1a. At this time, the water level in each tube begins to rise after the lower chamber 4 is filled with water.
Thereafter, the water level of each tube is visually confirmed from above the tubes 5a to 5c. As a result, it is determined that perforation has occurred in the tube in which the drop in the water level has been confirmed, and the perforated position is specified for the tube.

Next, with reference to FIG. 2, the case where the water level fall is confirmed by the tube 5a is demonstrated. FIG. 2 shows only the target tube 5a.
First, the float type measuring instrument 6 is put into the tube 5a where the water level is lowered. The float type measuring instrument 6 has a float 6a having a sufficient buoyancy with respect to water (liquid) in the tube, and preferably has a material or structure capable of floating on the water surface (liquid surface), and the float. And a scale 6b extending from 6a. The scale 6b is formed by marking the distance from the draft line of the float 6a on a soft long object such as plastic, and the distance from the water surface can be read when the float type measuring instrument 6 is floated on the water surface. Therefore, if the float type measuring instrument 6 is inserted into the tube 5a, the lowered water level, that is, the distance h from the opening end of the tube 5a to the water surface can be grasped.

  Here, the lowering of the water level in the tube 5a is caused by water leakage from the perforated Hu, and the water level in the tube 5a is lowered to the position of the perforated Hu, and the water level is stabilized at the position. become. Therefore, this distance h is the position of the perforated Hu from the tube opening end.

  When the position of the perforated Hu is specified, the work for closing the perforated Hu is performed after draining water. This operation is performed by, for example, a method of closing or covering the hole with a stopper. Since the position of the hole is known, the operation can be performed quickly and easily. The tube may be exchanged depending on the size and number of holes.

  If multiple holes are generated in the same tube at the same time, first identify the hole at the bottom of the tube filled with water, repair it, and then fill the tube again with water. This can be dealt with by repeating the process of identifying the hole and repairing the hole.

Moreover, as shown in FIG. 3, the case where perforated Hd generate | occur | produces in the junction part of the tube 5a and the partition plate 1b is demonstrated.
When perforated Hd is generated, the water injected into the tube 5a is lowered to the position of the existing outlet 31 in the same manner as described above. Therefore, if the float type measuring instrument 6 is introduced in the same manner as described above, the lowered water level, That is, the float is lowered to the height of the existing outlet 31. In this case, although it is not clear whether the tube 5a is perforated or the partition plate 1b is perforated, it can be estimated that one of the perforations is in the vicinity of the position corresponding to the outlet 31. It can be quickly dealt with by removing it from the

  If the position of the perforated Hd is specified, an operation for closing the perforated Hd is performed after draining. This operation is performed by, for example, a method of closing or covering the hole with a stopper. Since the position of the hole is known, the operation can be performed quickly and easily. Depending on the size, number, etc. of the holes, the tubes and partition plates may be exchanged.

DESCRIPTION OF SYMBOLS 1 Container 1a, 1b Partition plate 2 Upper chamber 3 Intermediate chamber 4 Lower chamber 5a-5c Tube 20, 30 Inlet 21 Cover 31, 40 Outlet 32 Exchanger body 6 Float type measuring instrument 6a Float 6b Scale A, B Fluid

Claims (2)

A cylindrical container is divided into an upper chamber, an intermediate chamber, and a lower chamber arranged in the axial direction by a partition plate, and the upper chamber and the lower chamber sandwiching the intermediate chamber are connected by one or more tubes. Type multi-tube heat exchanger
Supplying the liquid from the opening of the tube facing the upper chamber or the lower chamber to fill the inside of the tube with the liquid,
Thereafter, the float type measuring instrument is floated on the liquid level by inserting a float type measuring instrument into the tube where the liquid level of the liquid is lowered,
Measuring the distance from the opening of the tube to the liquid level using the float measuring instrument,
Identifying the perforated point in the vertical multi-tube heat exchanger with the measured distance;
A method for identifying perforated points in a vertical multi-tube heat exchanger characterized by the above.   The method for identifying a perforated portion in a vertical multi-tubular heat exchanger according to claim 1, wherein the liquid is water.

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