JP2014115051A - Heat exchanger and insulation member used inside heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of greatly improving corrosion resistance in an insulation member used in the heat exchanger and inside the heat exchanger, especially inside the heat exchanger, at lower cost than conventional ones, and provide the insulation member used inside the heat exchanger.SOLUTION: An insulation member 1 is composed of an elastic material, has a cylindrical part 2, and is configured such that the heat transfer pipe of a heat exchanger passes through along the inner peripheral side surface of the cylindrical part 2. Also, in both ends of the cylindrical part 2, projection parts 3, 3 projecting in the outer peripheral direction of the cylindrical part 2 are provided, and in the inner peripheral side surface and the outer peripheral side surface of the cylindrical part 2, a plurality of salients 4 are provided.

Description

  The present invention relates to a heat exchanger and an insulating member used inside the heat exchanger, and in particular, the corrosion resistance inside the heat exchanger is less expensive than that of the conventional one, and is greatly improved. The present invention relates to a heat exchanger that can be improved and an insulating member used inside the heat exchanger.

  Conventionally, in a seawater desalination apparatus in a multi-effect type (MED), a waste liquid evaporative concentration apparatus, etc., heat exchange having a heat transfer tube and a tube plate provided with a through-hole for passing the heat transfer tube inside The bowl is widely used. FIG. 2 schematically shows the inside of a horizontal tube heat exchanger 10 which is a typical example of such a heat exchanger.

  As shown in FIG. 2, the heat exchanger 10 basically has a heat transfer tube 11 and a tube plate 12 inside. A heating medium such as water vapor flows inside the heat transfer tube 11. Then, by spraying the liquid on the heat transfer tube 11 via the liquid supply nozzle 13, the sprayed liquid touches the outer peripheral side surface of the heat transfer tube 11 and is heated to generate steam. The heat exchanger 10 appropriately uses the steam generated in this manner depending on the application.

  Note that, in such a conventional heat exchanger 10, the tube plate 12 functions to fix or support the heat transfer tube 11. Therefore, at the position where the heat transfer tube 11 passes through the through hole provided in the tube plate 12, the heat transfer tube 11 is attached to the tube plate 12 in addition to the heat transfer tube 11 and the tube plate 12 being closely fixed. Some simply pass through the provided through holes. The heat transfer tube 11 and the tube plate 12 are closely fixed by a method called “expansion tube”, in which the end of the heat transfer tube 11 is expanded and the heat transfer tube 11 and the tube plate 12 are directly connected. FIG. 3 shows the heat transfer tube 11 and the tube plate 12 that are closely fixed by tube expansion.

  By the way, in this conventional heat exchanger 10, since it is necessary to make the material of the heat exchanger tube 11 and the tube sheet 12 metal from a viewpoint of heat resistance, pressure | voltage resistance, and intensity | strength ensuring, it is necessary to always consider corrosion resistance. . This point is particularly important when the heat exchanger 10 is used in a seawater desalination apparatus. This is because, in the seawater desalination apparatus, the liquid sprayed by the liquid supply nozzle 13 is seawater, and the corrosion of the heat transfer tubes 11 and the tube sheet 12 is likely to proceed. Therefore, in the conventional heat exchanger 10, the same metal material is used for the heat transfer tube 11 and the tube plate 12 so that the electric corrosion due to the potential difference between the metals does not occur in the portion where the heat transfer tube 11 and the tube plate 12 are close to each other. Or a metal that is resistant to corrosion, such as titanium, is used for the heat transfer tube 11 and the tube plate 12.

  However, in the conventional heat exchanger 10, even if the same metal material is used, electrolytic corrosion occurs due to the difference in molecular level composition in the contact portion, and the heat transfer tube 11 and the tube plate 12 are corroded. There was a problem. In addition, metals that are resistant to corrosion, such as titanium, are very expensive. Therefore, when the heat exchanger 10 is manufactured using such a metal, the heat exchanger 10 becomes very expensive. There was a problem that.

  The inventor of the present application has made extensive studies on methods and means that can solve the above problems under such circumstances. As a result, the inventor of the present application solves the above problems by interposing an insulating member between the heat transfer tube and the tube plate at a position where the heat transfer tube and the tube plate are close to each other inside the heat exchanger. The inventor has obtained knowledge that the present invention can be performed, and has led to the creation of the present invention.

  In addition, when filing the present invention, the present inventor and the applicant investigated past patent documents and the like. As a result, the following documents could be found regarding the heat exchanger. It was not possible to find a patent document detailing the above.

Japanese Utility Model Publication No. 63-160996 JP 2003-190701 A

  The present invention dramatically improves the corrosion resistance of a heat exchanger and an insulating member used inside the heat exchanger, in particular, the corrosion resistance inside the heat exchanger at a lower cost than the conventional one. An object of the present invention is to provide a heat exchanger that can be used, and an insulating member that is used inside the heat exchanger.

  As a means for this, the heat exchanger according to the present invention includes a heat transfer tube and a tube plate provided with a through-hole for passing the heat transfer tube therein. An insulating member is interposed between the heat transfer tube and the tube plate at a position close to the plate.

  The heat exchanger according to the present invention is also characterized in that it is used in a seawater desalination apparatus.

  Furthermore, the heat exchanger according to the present invention is characterized in that the insulating member is made of an elastic material.

  Moreover, the insulating member according to the present invention is a heat exchanger having a heat transfer tube and a tube plate provided with a through-hole for passing the heat transfer tube therein, and is provided between the heat transfer tube and the tube plate. It is an insulating member that is attached and used so as to intervene in, and has a cylindrical portion, and is configured so that the heat transfer tube passes along the inner peripheral side surface of the cylindrical portion. It is a feature.

  Furthermore, the insulating member according to the present invention is made of an elastic material, and at both ends of the cylindrical portion, protruding portions that protrude in the outer peripheral direction of the cylindrical portion are provided, and between the protruding portions. The distance is equivalent to the thickness of the tube sheet.

  The insulating member according to the present invention is provided with a plurality of convex portions on the inner peripheral side surface of the cylindrical portion and / or the outer peripheral side surface of the cylindrical portion, and the height of each convex portion is Further, it is also characterized in that it is smaller than the thickness of the cylinder constituting the cylindrical portion.

  According to the present invention, the heat exchanger and the insulating member used inside the heat exchanger, in particular, the corrosion resistance inside the heat exchanger is dramatically improved at a lower cost than the conventional one. It is possible to provide a heat exchanger that can be used, and an insulating member that is used inside the heat exchanger.

Sectional drawing of the insulating member 1 of this invention Schematic diagram of the inside of a conventional horizontal tube heat exchanger 10 The figure which showed the heat exchanger tube 11 and the tube sheet 12 which were made to closely_contact | adhere by expansion

  Hereinafter, the form for implementing the heat exchanger which concerns on this invention, and the insulating member used inside a heat exchanger is demonstrated. FIG. 1 is a cross-sectional view of an insulating member 1 according to this embodiment. The insulating member 1 has a cylindrical portion 2 and is configured such that a heat transfer tube can be passed along the inner peripheral side surface thereof. Further, the thickness T of the cylinder constituting the cylindrical portion 2 is a dimension corresponding to the difference between the outer diameter of the heat transfer tube that is to be passed along the inner peripheral side surface and the inner diameter of the through hole provided in the tube plate. It has become.

  The insulating member 1 is made of an elastic material such as rubber, and as shown in the drawing, projecting portions 3 and 3 projecting in the outer peripheral direction of the cylindrical portion 2 are provided at both ends of the cylindrical portion 2. Is provided. Moreover, the distance L between these protrusion parts 3 and 3 is comprised so that it may become equivalent to the thickness of a tube sheet. Furthermore, a plurality of convex portions 4 are provided on the inner peripheral side surface of the cylindrical portion 2 and the outer peripheral side surface of the cylindrical portion 2.

  The insulating member 1 configured as described above is used by being attached so as to be interposed between the heat transfer tube and the tube sheet in the vicinity thereof. Therefore, the insulating member 1 comes into contact with the through-hole provided in the tube plate on the outer peripheral side surface, and simultaneously comes into contact with the heat transfer tube on the inner peripheral side surface. At this time, since the distance L between the protrusions 3 and 3 corresponds to the thickness of the tube sheet, the protrusions 3 and 3 are caught on both edges of the through holes of the tube sheet, and the insulating member 1 is connected to the tube sheet. It is supposed to be fixed to. At this time, since the plurality of convex portions 4 are sandwiched between the heat transfer tubes and the tube sheet and crushed, the insulating member 1 is not easily displaced.

  In the above case, the height h of each convex part 4 is preferably smaller than the thickness T of the cylinder constituting the cylindrical part 2. This is because if the height h of each convex portion 4 is made too large (high), it becomes very difficult to put the insulating member 1 between the heat transfer tube and the tube sheet. .

  Moreover, in the above embodiment, although the insulating member 1 is comprised with the elastic material, it is also possible to comprise the insulating member 1 with things other than an elastic material. However, in this case, when the insulating member 1 is attached so as to be interposed between the heat transfer tube and the tube sheet, the insulating member 1 cannot be deformed. Therefore, the insulating member 1 is constituted by a plurality of members. Is required.

  Further, in the above embodiment, the plurality of convex portions 4 are provided on the inner peripheral side surface of the cylindrical portion 2 and the outer peripheral side surface of the cylindrical portion 2, but either the inner peripheral side surface or the outer peripheral side surface is provided. It is possible to provide only one of them, or not to provide the plurality of convex portions 4 at all. However, in these cases, the insulating member 1 may be slightly shifted between the heat transfer tube and the tube sheet.

  By using the insulating member 1 described above inside the heat exchanger, it is possible to prevent the occurrence of electrolytic corrosion at a position where the heat transfer tube and the tube sheet are close to each other. Further, a heat exchanger having high corrosion resistance can be manufactured using an inexpensive metal without using a metal resistant to corrosion such as titanium. In addition, when this heat exchanger based on this invention is used for a seawater desalination apparatus, this effect peculiar to this invention will appear notably. This is because the seawater desalination apparatus requires much more corrosion resistance in the heat exchanger than other apparatuses using the heat exchanger.

  As described above, according to the present invention, the heat exchanger and the insulating member used inside the heat exchanger, in particular, the corrosion resistance inside the heat exchanger can be made cheaper than the conventional one. And the heat exchanger which can be improved dramatically, and the insulating member used inside a heat exchanger can be provided.

1: Insulating member,
2: Cylindrical part,
3: Projection
4: convex part,
10: heat exchanger,
11: Heat transfer tube,
12: Tube sheet
13: Liquid supply nozzle,
T: thickness of the cylinder constituting the cylindrical portion 2,
L: distance between the protrusions 3 and 3;
h: Height of the convex part 4

Claims (6)

In a heat exchanger having a heat transfer tube and a tube plate in which a through hole for passing the heat transfer tube is provided,
An insulating member is interposed between the heat transfer tube and the tube plate at a position where the heat transfer tube and the tube plate are close to each other.   The heat exchanger according to claim 1, wherein the heat exchanger is used in a seawater desalination apparatus.   The heat exchanger according to claim 1, wherein the insulating member is made of an elastic material.   In a heat exchanger having a heat transfer tube and a tube plate provided with a through-hole for passing the heat transfer tube inside, the heat exchanger is used so as to be interposed between the heat transfer tube and the tube plate. An insulating member having a cylindrical portion, wherein the heat transfer tube passes along an inner peripheral side surface of the cylindrical portion.   It is made of an elastic material, and at both ends of the cylindrical portion, there are provided protruding portions that protrude in the outer peripheral direction of the cylindrical portion, and the distance between the two protruding portions is the thickness of the tube plate. The insulating member according to claim 4, wherein the insulating member is equivalent.   On the inner peripheral side surface of the cylindrical portion and / or the outer peripheral side surface of the cylindrical portion, a plurality of convex portions are provided, and the height of each convex portion is that of the cylinder constituting the cylindrical portion. The insulating member according to claim 5, wherein the insulating member is smaller than the thickness.

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