WO2022265118A1

WO2022265118A1 - Deposit suppression structure for heat exchanger and heat exchanger having deposit suppression structure

Info

Publication number: WO2022265118A1
Application number: PCT/JP2022/024433
Authority: WO
Inventors: 孝志西村
Original assignee: 株式会社潤工社
Priority date: 2021-06-18
Filing date: 2022-06-17
Publication date: 2022-12-22
Also published as: JPWO2022265118A1

Abstract

The purpose of the present invention is to provide a deposit suppression structure for a heat exchanger to be used in a state of being immersed in a liquid, and a heat exchanger having the deposit suppression structure. The present invention addresses the problem by providing: a deposit suppression structure for a heat exchanger that is characterized by comprising a cylindrical member fitted on the outside of, among a plurality of heat transfer pipes, at least one of the heat transfer pipes, and that is characterized in that the cylindrical member has inner and outer surfaces and first and second ends, and the cylindrical member is provided with a seal member at the first end and/or the second end; and a heat exchanger having the deposit suppression structure.

Description

Deposit control structure for heat exchanger and heat exchanger having deposit control structure

TECHNICAL FIELD The present invention relates to a deposit suppression structure for a heat exchanger and a heat exchanger having the deposit suppression structure. More particularly, the present invention relates to a heat exchanger that is used by being immersed in a liquid tank, and relates to a structure that suppresses deposition of deposits on the surfaces of heat transfer tubes near the liquid surface, and a heat exchanger that has such a structure.

　　Immersion-type heat exchangers made up of heat transfer tubes with excellent corrosion resistance are used as heat exchangers used for chemical cleaning, plating liquid temperature control, chemical liquid temperature control, hot spring heat utilization, etc. Immersion type heat exchanger is a heat exchanger consisting of one or more heat transfer tubes in a liquid bath, almost the entire heat transfer tube is immersed in liquid, and a part of the heat transfer tube, that is, the heat medium or refrigerant It is used by arranging the connection part with the pipe outside the liquid (above the liquid surface).

Chemical cleaning is a method of chemically removing unnecessary substances and dirt from the surface of the object to be cleaned using acids, alkalis, solvents, etc., according to the purpose of degreasing, derusting, and rust prevention. It is often carried out by immersing the object to be cleaned in a pool of liquid. At this time, a heat exchanger is used for the purpose of heating or cooling the chemicals in the liquid bath. Among chemical cleaning methods, pickling is used in fields that handle metal products such as steel plates, wire rods, shaped steels, pipes, stainless steel materials, and titanium plates. It is a cleaning operation performed to remove impurities. Acid solutions such as hydrochloric acid, sulfuric acid, nitric acid, and hydrofluoric acid are used for cleaning. For example, in the case of continuously treating plate materials and wire rods, the plate materials and wire rods are continuously transported into a liquid tank filled with an acid solution and washed. At this time, the acid solution is often used after being heated to about 60 to 110° C., and one or more heat exchangers are arranged in the solution tank. The acid solution in the liquid tank contains oxides (scale fragments) detached from the surface of the steel material, oil stains, and the like. In particular, when scale pieces mixed with oil adhere to the surface of the heat exchanger, they become agglomerates of the scale pieces and accumulate on the surface of the heat exchanger. The adhesion and accumulation of scale pieces on the heat exchanger not only reduces the heat exchange efficiency of the heat exchanger, but also causes the heat exchanger to be crushed by the weight of the scale pieces, causing damage to the heat exchanger. . Furthermore, the work of removing the scale pieces deposited on the heat exchanger poses a safety problem because there is a risk of coming into contact with the acid solution, and the acid solution also harms the respiratory organs. In order to solve such a problem, Patent Document 1 discloses that compressed air or an acid solution in a tank is blown to the corners of a heat exchanger where scale pieces tend to accumulate and grow to remove scale pieces adhering to the corners. is washed away to protect the heat exchanger from agglomeration and deposition of scale pieces, oil, etc. (hereinafter referred to as scale), thereby preventing deterioration in heat exchange efficiency and deformation.

In addition, in the immersion type heat exchanger used in the acid bath for pickling, there was a problem of scale adhering to the surface of the heat transfer tubes near the liquid surface. The technique described in Patent Document 1 is effective in preventing scale pieces from adhering to the heat exchanger in the portion completely immersed in the liquid in the liquid tank, but in the vicinity of the liquid surface including the upper part of the liquid surface However, it was difficult to exert its effect. In the vicinity of the contact between the heat transfer tube surface and the liquid surface, for example, when a steel plate or the like is immersed in an acid liquid bath, the liquid surface fluctuates up and down, causing scale to adhere to the heat transfer tube surface. is the problem. This scale is formed by evaporating the volatile matter of the acid solution adhering to the surface of the heat transfer tube, leaving a solid content, and repeatedly adhering the acid solution to the solid content, evaporating the volatile matter again, and becoming a large mass of solid content. formed by While such scales are hardened, they become larger lumps, causing breakage of the heat transfer tubes, and are difficult to remove.

In response to such problems, Patent Document 2 describes a method for preventing scale from adhering to the outer peripheral surface of a heat transfer tube in the vicinity of the contact with the liquid surface. A method of covering the heat transfer tubes of a heat exchanger with a fluororesin heat-shrinkable tube is described. Specifically, the heat-shrinkable tube is positioned so that it covers the area where scales adhere to the heat-conducting tube, and the heat-shrinkable tube is heated at this position to cover the heat-conducting tube. A method of forming a tube. It is said that by using this method, the scale does not adhere directly to the heat transfer tubes but adheres to the protection tubes, thereby preventing damage to the heat transfer tubes.

However, with the technique of Cited Document 2, scale does not adhere directly to the heat transfer tubes, but scale adheres to the protective tubes that cover the heat transfer tubes. Therefore, if the deposits are not removed frequently, they become large lumps, and if the deposits between the heat transfer tubes entangle the heat transfer tubes and become integrated, there is a problem that the removal of the deposits becomes even more difficult. rice field. Adhesives that coalesce into a large mass not only reduce the heat conduction of that part, but also cause damage to the heat transfer tubes when removing the adherings, or break the heat transfer tubes due to the adherings. was causing problems.

Japanese Patent Application Laid-Open No. 2003-213466 Japanese Unexamined Patent Application Publication No. 2011-141080

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and it is an object of the present invention to provide a deposit suppression structure for a heat exchanger and a heat exchanger having the deposit suppression structure. .

As a result of considering the above problems, the present invention was reached. Specifically, the deposit suppression structure for a heat exchanger according to the present invention is a heat exchanger comprising one or a plurality of heat transfer tubes, wherein the heat exchanger is configured such that the outer surfaces of the heat transfer tubes are brought into contact with a liquid. The heat exchanger includes a tubular member that is fitted over one or more of the heat transfer tubes, the tubular member having an inner surface and an outer surface. The tubular member has a surface and has a first end and a second end, wherein the tubular member is provided with a sealing member at least one of the first end and the second end.

Further, the above problem is more preferably solved by providing sealing members at both the first end and the second end of the cylindrical member.

Further, it is preferable that the tubular member has a contact angle of 90° or more at least on the outer surface.

The tubular member preferably has a structure with one or more coating layers on its outer surface. Moreover, it is more preferable that the coating layer is a layer at least partially provided with easy tearability. Moreover, the coating layer preferably has a contact angle of 90° or more at least on the outer surface.

Further, in order to solve the above problems, the heat exchanger having the deposit suppression structure of the present invention is a heat exchanger including one or more heat transfer tubes, wherein the heat exchanger is arranged in a liquid tank and the A heat exchanger that exchanges heat by contacting a liquid with the outer surface of a heat transfer tube, wherein the heat exchanger includes a tubular member that is fitted around one or more of the heat transfer tubes, said tubular member having an inner surface and an outer surface and having a first end and a second end, said tubular member having a seal member at least one of said first end and said second end; One end of the cylindrical member is installed so as to be positioned above the liquid surface of the liquid tank.

In addition, it is preferable that at least the outer surface of the heat transfer tube of the heat exchanger having the deposit suppression structure of the present invention is made of at least one resin selected from fluororesins.

According to the present invention, it is possible to effectively prevent or suppress the formation of deposits on the surface of heat transfer tubes of a heat exchanger. The frequency of maintenance work for removing deposits on the heat exchanger can be greatly reduced, and the removal of deposits is easy, so damage to the heat transfer tubes can be suppressed.

1 is a schematic diagram of a heat exchanger provided with a deposit suppression structure for a heat exchanger of the present invention; FIG. It is a structural schematic diagram of a conventional heat exchanger near the liquid surface. It is a conceptual diagram of deposit formation in a conventional heat exchanger. FIG. 2 is a structural schematic view of the heat exchanger having the deposit suppressing structure of the present invention, near the liquid surface; FIG. 2 is a conceptual diagram of deposit formation in a heat exchanger having the deposit suppression structure of the present invention. FIG. 4 is a structural schematic diagram near the liquid surface of another example of the heat exchanger having the deposit suppression structure of the present invention. It is an example of the shape of the cylindrical member of the deposit suppression structure of the heat exchanger of the present invention. FIG. 4 is a schematic diagram of an example of a seal member arranged on a cylindrical member of the deposit suppression structure for a heat exchanger of the present invention; FIG. 4 is a schematic diagram of another example of a heat exchanger having a deposit suppression structure for a heat exchanger of the present invention; FIG. 4 is a schematic diagram of another example of a heat exchanger having a deposit suppression structure for a heat exchanger of the present invention;

A preferred embodiment of a deposit suppression structure for a heat exchanger and a heat exchanger having the deposit suppression structure according to the present invention will be described with reference to the drawings. In each figure, the same elements are denoted by the same reference numerals, and redundant descriptions may be omitted when similar descriptions are given.

FIG. 1 is a schematic diagram of an example of a heat exchanger having a deposit suppression structure for a heat exchanger of the present invention. As shown in FIG. 1, the heat exchanger 100 arranged in the liquid tank A includes a heat transfer tube 110 and a connector 120 connected to a heat source pipe (not shown). A cylindrical member 130 is provided.

The heat exchanger 100, which is generally called the immersion type, is used with almost the entire heat transfer tube immersed in the liquid in the liquid tank A. The heat transfer tube 110 is composed of one or a plurality of tubes, and is arranged to have a loop shape of a size convenient for charging into the liquid tank A. As shown in FIG. An end portion of the heat transfer tube 110 is arranged at a position higher than the liquid surface B. The end of the heat transfer tube 110 located above the liquid surface is connected to a heat source (e.g., steam supply port not shown) piping, from which a heat medium (or refrigerant) is supplied inside the heat transfer tube 110.

In the vicinity of the liquid surface B of the heat transfer tube 110, a cylindrical member 130 used as the deposit suppression structure of the present invention is arranged. For example, in the pickling process for steel plates and steel wire rods, the acid solution in the liquid tank is controlled by immersing the object to be cleaned in the acid liquid tank, adjusting the temperature, and stirring the liquid in the tank. The liquid level rises and falls within a certain range and oscillates. Further, when objects to be cleaned such as steel plates and steel wires are continuously conveyed into the acid bath at high speed, splashes are generated on the surface of the acid solution. At this time, the acid liquid adheres to the surface of the heat transfer tube above the liquid surface, and the volatile matter evaporates to precipitate the solid content on the surface of the heat transfer tube. If this is repeated, the deposit will grow and become larger. The tubular member 130 can suppress the fluctuation of the liquid surface inside the tubular member, and can prevent droplets generated on the liquid surface from adhering to the heat transfer tubes. Furthermore, when the sealing member is arranged at the upper end portion of the cylindrical member, an effect of suppressing the evaporation of the volatile matter of the acid liquid inside the cylindrical member can be expected. In this way, the tubular member 130 prevents or suppresses the formation of deposits on the outer surface of the heat transfer tube 110 inside the tubular member. Even in such a case, the surface of the cylindrical member 130 has a simple shape, so it is very easy to remove the deposits.

Fig. 2 is a schematic diagram of the structure near the liquid surface of an example of a conventional heat exchanger, and Fig. 3 is a conceptual diagram of deposit formation in a conventional heat exchanger. FIG. 4 is a structural schematic diagram of the vicinity of the liquid surface of an example of the heat exchanger provided with the deposit suppressing structure of the present invention. FIG. 4 shows an example in which a sealing member 131 is arranged at the lower end of the cylindrical member 130. As shown in FIG. FIG. 5 is a conceptual diagram of deposit formation in an example of a heat exchanger equipped with the deposit suppression structure of the present invention. In the conventional heat exchanger of FIG. 2, the heat transfer tubes 110 are exposed to the liquid with their outer surfaces exposed to the liquid, or the surfaces of the heat transfer tubes 110 individually coated. As shown in FIG. 3, the regions C1 where deposits are generated near the liquid surface of the heat exchanger are on the outer surface of each of the heat transfer tubes 110, and the operation to remove the deposits is performed on each heat transfer tube. need to do it. Furthermore, if the deposits on the surface of the heat transfer tube 110 are not removed frequently, the deposits on the surface of the heat transfer tube 110 will unite with each other, and the deposits will become a lump involving the heat transfer tubes. There were many problems such as the difficulty of On the other hand, in the example of the heat exchanger provided with the deposit suppression structure of the present invention shown in FIG. As shown in FIG. 5, the area C2 where deposits are generated near the liquid surface is located on the outer surface of the cylindrical member 130, and even if deposits are formed, they can be easily removed. There is no fear of damaging the heat pipe.

The tubular member is preferably arranged at a position where the first end of the tubular member is above the liquid surface and the second end is below the liquid surface. Here, the lower part of the liquid level means a position lower than the fluctuation range of the liquid level, and the second end of the cylindrical member is always immersed in the liquid in the liquid tank even when the liquid level fluctuates. Preferably. The upper portion of the liquid surface is a position higher than the fluctuation range of the liquid surface, preferably a position where the heat transfer tubes can be covered up to a position where droplets generated on the liquid surface do not reach. In a heat exchanger in which a support plate, top plate, or the like is arranged between the liquid surface in the liquid tank and the connection between the heat transfer tube and the heat source pipe, the tubular member is connected to the support plate or the top plate. , or more preferably through them. The cylindrical member arranged in such a manner can block the droplets generated on the liquid surface from the heat transfer tubes.

FIG. 6 is a structural schematic diagram near the liquid surface of another example of a heat exchanger equipped with the deposit suppression structure of the present invention. The cylindrical member may be one in which all the heat transfer tubes of the heat exchanger are collectively inserted as shown in FIG. It may be inserted, or may be extrapolated to a part of the heat transfer tubes as shown in FIG. 6(b). The arrangement of the tubular member can be appropriately determined according to the arrangement of the heat exchanger, the occurrence of splashes on the liquid surface, the maintenance situation, and the like.

The cross-sectional shape of the cylindrical member 130 is not limited as long as it has an inner surface and an outer surface and has a first end and a second end. For example, the cross-sectional shape is not limited to a circular shape as shown in FIG. An example of (c) may be a hexagon). Also, the cross-sectional shape may be irregular as shown in FIG. The shape of the tubular member can be appropriately determined according to the arrangement of the heat exchangers, maintenance, and the like. In addition, the cross-sectional shape and cross-sectional area of the first end and the second end need not be the same. For example, as shown in FIG. The cross-sectional area of the second end below the liquid level may be smaller. In the case of the shape shown in FIG. 7(f), the walls of the tubular member are inclined, so that droplets adhering to the surface of the tubular member can easily drop, and even if the adherents grow, they will grow. There is an advantage that the adhered matter easily falls off by its own weight.

The cylindrical member may have any shape as described above after being placed in the heat exchanger, and the shape before being placed in the heat exchanger is not limited. For example, the tubular member may be formed by rounding a sheet of plate into a cylindrical shape so as to cover the heat transfer tube when it is attached to the heat exchanger. Further, for example, the tubular member may be formed by pasting a plurality of plate materials around the heat transfer tube so as to form a tubular shape. It is preferable that the wall portion of the cylindrical member has no gaps if possible. As long as it is a material, the wall of the cylindrical member may be mesh-like or have slits or the like. In this case, it is preferable that the outer surface of the tubular member is a surface on which deposits are less likely to form and from which the generated deposits can be easily removed.

At least the outer surface of the tubular member is preferably smooth and has a contact angle of 90° or more. For example, it is possible to adjust the state of the outer surface by polishing the outer surface of the tubular member to adjust the surface shape, or by providing a film made of a material with a large contact angle on the outer surface of the tubular member. is. By making the outer surface of the cylindrical member have a contact angle of 90° or more, deposits are less likely to form on the outer surface of the cylindrical member, and the generated deposits can be easily removed. become a thing. In the case of a structure having a coating layer on the outer surface of the cylindrical member, which will be described later, the outer surface of the coating layer is preferably smooth and has a contact angle of 90° or more.

The tubular member is preferably constructed with one or more coating layers on its outer surface. When a plurality of coating layers are provided, it is preferable that the coating layers have a structure that can be peeled off one by one. The structure having the coating layer on the surface of the tubular member is used when the surface of the tubular member becomes dirty or when it becomes difficult to remove deposits on the surface of the tubular member due to repeated removal of deposits. A high effect can be obtained again by peeling off the coating layer to form a new surface. In addition, in a structure having a plurality of coating layers, it is possible to peel off the outer coating layer one by one together with the adhered matter, so that a new surface can be easily obtained repeatedly. Also, the coating layer of the tubular member may have a structure in which a film-shaped material is wound around the outer surface of the tubular member and fixed in a tubular shape. In that case, it is possible to release the cylindrical fixation of the coating layer and peel and remove the film. Moreover, the coating layer may be one in which at least a part of the layer is imparted with easy tearability. The easy-to-tear property of the coating layer is obtained by providing cuts or scratches on the surface of the coating layer to make it easier to tear along the cuts, by thinning the thickness of a part of the coating layer to provide an easy-to-tear portion, and by using a plurality of resins. It can be realized by a method such as using an easily tearable tube or film made of a mixed material or the like as the coating layer. When a coating layer imparted with easy tearability is used, a special tool is not required when peeling the coating layer, and workability is high.

It is preferable that the material forming at least the outer surface of the tubular member is not easily destroyed by the liquid in the liquid tank and the ambient temperature of the tubular member. The material is preferably metal, resin, or the like, which does not break even when some stress or impact is applied. For example, when a corrosive liquid is used, the material of the cylindrical member may be metal such as gold, platinum, tantalum, Hastelloy, nickel alloy, etc., which is excellent in corrosion resistance, or resin. good. If it is made of resin, for example, polypropylene (PP), GF-reinforced PP, polyvinyl chloride (PVC), fluororesin, fiber-reinforced plastic (FRP), or the like can be used. Among them, polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene (FEP), poly Fluororesins such as chlorotrifluoroethylene (PCTFE) and polyvinylidene fluoride (PVDF) have a wide range of applications.

The cylindrical member preferably has a sealing member at least one of the first end and the second end. It is more preferable that the sealing member is arranged at the lower end of the tubular member (lower than the liquid surface), and it is further preferable that the sealing member is arranged at both the upper end and the lower end of the tubular member. . The sealing member has a structure in which the heat transfer tube is inserted and prevents liquid from flowing into the cylindrical member. Further, it is more preferable that the sealing member has a structure that inhibits ventilation into the cylindrical member, and more preferably a structure that can block the cylindrical member. FIG. 8 is a schematic diagram of an example of a seal plate 800 used as a seal member arranged on the cylindrical member of the deposit suppression structure of the heat exchanger of the present invention. The seal plate 800 is provided with through holes 810 through which the heat transfer tubes are inserted. The material of the seal plate is preferably one that is not easily destroyed by the liquid in the liquid tank and the ambient temperature of the cylindrical member. The material is not particularly limited as long as it does not break even when some stress or impact is applied, such as metal or resin. For example, when using a corrosive liquid, metals such as gold, platinum, tantalum, hastelloy, nickel alloy, etc., which are excellent in corrosion resistance, may be used, or polypropylene (PP), GF-reinforced PP, polychlorinated Vinyl (PVC), fiber reinforced plastic (FRP), fluororesin, fluororubber, perfluoroelastomer, silicone rubber, etc. as described above can be used. Considering the outer diameter of the heat transfer tube, the hole diameter of the through hole 810 is preferably set to be the same as or slightly larger than the outer diameter of the heat transfer tube. A filler that reduces the gap between the through hole 810 and the heat transfer tube can be placed in the through hole 810 of the seal plate 800 . When it is desired to have a structure in which the cylindrical member is closed by the sealing member, for example, a filler such as an O-ring may be placed in the through hole 810 of the seal plate 800 to fill the gap between the through hole 810 and the heat transfer tube. Alternatively, the seal plate is made of a flexible material such as fluororubber, and the hole diameter of the through hole 810 is the same as or slightly smaller than the outer diameter of the heat transfer tube. It is also possible to adopt a structure in which the tubular member is closed when the is inserted. Alternatively, for example, a structure in which two seal plates are prepared and a sheet made of an elastic material such as rubber is sandwiched and fixed between the seal plates may be employed. In this case, the sheet made of elastic material should have a hole with a diameter equal to or slightly smaller than the outer diameter of the heat transfer tube at a position corresponding to the through hole of the seal plate. The two seal plates can also be configured to be fixed using fixing holes 820 . A sheet made of an elastic material placed between the two seal plates can fill the gap between the through-hole 810 and the heat transfer tube, closing the tubular member.

The sealing member may be prepared by molding into a shape as shown in the example of FIG. 8 before inserting the heat transfer tube, inserting the heat transfer tube into the through hole 810 and fixing it to the cylindrical member. Alternatively, it may be formed by filling the space between the tubular member and the heat transfer tube with the material of the sealing member so that the shape shown in the example of FIG. 8 is obtained after the heat transfer tube and the tubular member are arranged. .

It is more preferable that the tubular member or the sealing member is one whose structure can be divided. As a result, the tubular member can be removed without removing heat exchanger components such as heat transfer tubes and connectors from the state of being attached to the heat exchanger, and only the tubular member can be replaced.

A cylindrical member provided with a sealing member supplies gas or liquid from a gap between the sealing member and the heat transfer tube, etc., and creates a differential pressure between the inside and outside of the cylindrical member to create a slight positive pressure inside the cylindrical member. can. By applying a slight positive pressure, it is possible to suppress the liquid in the liquid phase from entering the tubular member through the gap between the seal member and the heat transfer tube. The liquid supplied to the inside of the cylindrical member may be water or the like, but it is more preferable to use the same kind of liquid as the liquid in the liquid phase in terms of concentration control. Further, when the liquid supplied to the inside of the shaped member is an acid liquid, a self-cleaning effect against scale adhesion can be expected.

The heat exchanger 100 includes a connector 120 that connects the heat transfer tubes 110 and the heat source piping, a tubular member 130, a spacer 140 that holds the arrangement of the heat transfer tubes 110 in the liquid tank A, and spacers that are connected to form a shape. A fixing member 150 that maintains the heat transfer tube 110, a rod 160 that prevents the heat transfer tube 110 from floating, and the like may be provided (see FIG. 1).

FIG. 9 is a schematic diagram of another example of a heat exchanger provided with the deposit suppression structure for a heat exchanger of the present invention.
A plurality of heat transfer tubes 110 fixed in a loop shape are arranged in parallel, and the end of each heat transfer tube 110 is connected to a connector (not shown) connected to a heat source pipe. Near the connecting portion of the heat transfer tubes, the heat transfer tubes are gathered in one place on each of the inlet side and the outlet side of the heat medium, and a cylindrical member 130 is provided so as to cover the part corresponding to the liquid surface of the gathered heat transfer tubes 110. are placed. The upper end of the cylindrical member (above the liquid surface) is connected to a top plate 160 that functions as a lid for the liquid tank. It has a structure that is blocked from the generated droplets.

FIG. 10 is a schematic diagram of another example of a heat exchanger provided with the deposit suppression structure for a heat exchanger of the present invention. A plurality of heat transfer tubes 110 are bundled and arranged in a U shape, and the ends of the heat transfer tubes 110 are connected to connectors 120 connected to heat source piping. The bundle of heat transfer tubes is arranged such that the inlet side end and the outlet side end of the heat medium are adjacent to each other, and the portion corresponding to the vicinity of the liquid surface of the heat transfer tubes 110 is collectively fitted around the cylindrical member 130. . The heat exchanger may be one in which the heat transfer tubes 110 are arranged in a loop shape, or as in the example of FIG.
It may be arranged in a U shape.

In the heat exchanger having the deposit suppression structure of the heat exchanger of the present invention, it is preferable that at least the outer surface of the heat transfer tube is made of at least one material selected from fluororesins. Any material may be used as long as it is not easily destroyed by the liquid in the liquid bath and the ambient temperature of the cylindrical member. Although the material may be metal, it is more preferable to use a resin whose shape can be freely changed according to the shape of the liquid tank. If it is made of resin, for example, polypropylene (PP), GF-reinforced PP, polyvinyl chloride (PVC), fluororesin, fiber-reinforced plastic (FRP), or the like can be used. Among them, polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene (FEP), poly More preferably, it is composed of at least one selected from fluororesins such as chlorotrifluoroethylene (PCTFE) and polyvinylidene fluoride (PVDF). The fluororesin may contain a filler in order to impart or improve thermal conductivity, electrical conductivity, barrier properties, mechanical strength, or the like. Examples of fillers contained in the fluororesin include amorphous carbon particles, graphite particles, and glass fibers.

According to the present invention, it is possible to effectively prevent or suppress the formation of deposits on the surface of heat transfer tubes of a heat exchanger, and there is a risk of harm to respiratory organs and contact with acid liquid. The frequency of severe maintenance work for removing scale pieces deposited on the heat transfer tubes can be greatly reduced. In addition, the removal of deposits is easy and the work of removing deposits does not damage the heat transfer tubes, so the heat exchanger can be used while maintaining high performance.

A liquid tank, B liquid surface, C area where deposits are generated 100 heat exchanger, 110 heat transfer tube, 120 connector, 130 tubular member, 131 sealing member, 140 spacer, 150 fixing member, 160 rod seal plate 800, penetration hole 810, fixing hole 820

Claims

In a heat exchanger comprising one or more heat transfer tubes,
The heat exchanger is a heat exchanger that exchanges heat by contacting a liquid with the outer surface of the heat transfer tube,
The heat exchanger comprises a cylindrical member that is fitted around one or more of the heat transfer tubes,
the tubular member has an inner surface and an outer surface and has a first end and a second end;
The tubular member has a seal member at least one of the first end and the second end,
Deposit control structure for heat exchangers.
the tubular member includes a sealing member at both the first end and the second end;
The deposit suppression structure for a heat exchanger according to claim 1 .
The cylindrical member has a contact angle of 90° or more at least on the outer surface,
3. The deposit suppression structure for a heat exchanger according to claim 1.
the tubular member comprises one or more coating layers on its outer surface;
3. The deposit suppression structure for a heat exchanger according to claim 1.
The coating layer of the tubular member is a layer at least partially imparted with easy tearability,
The deposit suppression structure for a heat exchanger according to claim 4.
The coating layer of the cylindrical member has a contact angle of 90° or more at least on the outer surface.
The deposit suppression structure for a heat exchanger according to claim 4.
In a heat exchanger with one or more heat transfer tubes,
The heat exchanger is a heat exchanger that is arranged in a liquid tank and exchanges heat by contacting the liquid with the outer surface of the heat transfer tube,
The heat exchanger comprises a cylindrical member that is fitted around one or more of the heat transfer tubes,
the tubular member has an inner surface and an outer surface and has a first end and a second end;
the tubular member has a seal member at least one of the first end and the second end;
One end of the cylindrical member is installed above the liquid surface of the liquid tank,
A heat exchanger having a deposit control structure.
8. The heat exchanger according to claim 7, wherein at least an outer surface of said heat transfer tube is made of at least one resin selected from fluororesins.