CN108036668B

CN108036668B - Heat exchange tube, heat exchanger comprising the same and method for manufacturing the heat exchange tube

Info

Publication number: CN108036668B
Application number: CN201711288625.2A
Authority: CN
Inventors: 程向锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-12-07
Filing date: 2017-12-07
Publication date: 2024-03-15
Anticipated expiration: 2037-12-07
Also published as: CN108036668A

Abstract

The application discloses heat exchange tube, it includes: a first heat exchange panel and a second heat exchange panel disposed opposite to each other; and first and second side baffles disposed opposite each other, wherein the first and second heat exchange panels, the first and second side baffles together enclose an interior conduit defining a heat exchange tube, wherein the first and second heat exchange panels, the first and second side baffles are made of at least one material of glass, ceramic, graphite, silicon carbide, and wherein at least one of the first and second heat exchange panels is separate from at least one of the first and second side baffles and sealingly connected together by an adhesive. The present application also relates to a heat exchanger comprising such a heat exchange tube and a method of manufacturing a heat exchange tube. The device has the advantages of small stress concentration, simple and convenient manufacture, high reliability, high bearing capacity, high heat transfer rate, compact structure, excellent corrosion resistance and the like.

Description

Heat exchange tube, heat exchanger comprising the same and method for manufacturing the heat exchange tube

Technical Field

The application relates to the technical field of heat exchange tubes and heat exchangers, in particular to a heat exchange tube suitable for a strong corrosive medium and having the requirement of pressure bearing capacity, a manufacturing method thereof and a heat exchanger comprising the heat exchange tube.

Background

Glass tubes have excellent corrosion resistance, and in particular round glass tubes have a mature manufacturing process and low cost, and heat exchange tubes used as heat exchange devices have been used for nearly half a century. However, the round glass tube has lower flexural section modulus, lower strength, larger brittleness and low pressure-bearing capacity, and is used for the heat exchange tube with the length-diameter ratio of not more than 50, otherwise, accidents such as fracture, vibration failure and the like can occur, so that the single heat exchanger has the defects of smaller load, low heat exchange efficiency, poor structure compactness and the like, and the application of the round glass tube is severely limited, and therefore, the glass heat exchange tube is mainly used in the gas-gas heat exchange field with the small load working condition in normal pressure or micro-positive pressure occasions.

In recent years, new proposals have been made for improvement of glass heat exchange tubes, wherein flat glass tubes are more common, but are limited by a glass tube drawing process, the qualification rate is extremely low when the cross-section length-width ratio exceeds 5, and the stress concentration of the drawn glass tube is more serious when the cross-section length-width ratio is larger based on the characteristics of glass, so that the glass tube is used as the heat exchange tube with higher failure rate.

In addition, the conventional glass tube requires complicated processes and procedures such as melting, drawing, shaping, cutting, grinding and the like, and thus has the disadvantages of complicated processing equipment, complicated manufacturing process, high manufacturing cost and the like.

Disclosure of Invention

In view of the above, it is an object of the present application to provide a heat exchange tube, a heat exchanger including such a heat exchange tube, and a method of manufacturing a heat exchange tube, to at least partially solve the above-mentioned problems.

According to one aspect of the present application, there is provided a heat exchange tube comprising: a first heat exchange panel and a second heat exchange panel disposed opposite to each other; first and second side baffles disposed opposite each other, wherein the first and second heat exchange panels, the first and second side baffles together enclose an interior conduit defining a heat exchange tube, wherein the first and second heat exchange panels, the first and second side baffles are made of at least one of glass, ceramic, graphite, silicon carbide, and wherein at least one of the first and second heat exchange panels and at least one of the first and second side baffles are separate and sealingly connected together by an adhesive.

Preferably, N intermediate baffles are disposed in the inner tube of the heat exchange tube, and the intermediate baffles are sealingly connected with the first heat exchange panel and the second heat exchange panel by an adhesive to divide the inner tube into n+1 independent inner fluid passages sealed with each other, where N is an integer greater than or equal to 1.

Preferably, at least one reinforcing rib for supporting the first and second heat exchange panels is further provided in the internal fluid passage, and the at least one reinforcing rib is connected with the first and second heat exchange panels by an adhesive.

Preferably, the first heat exchange panel, the second heat exchange panel, the first side baffle and the second side baffle are all independent components, and the first heat exchange panel and the second heat exchange panel are all connected with the first side baffle and the second side baffle in a sealing way through an adhesive.

Preferably, the refractory temperature of the binder is not lower than 250 ℃, and the heat transfer property is not lower than that of the base material of the member to which the binder is bonded.

Preferably, the composition of the binder comprises: 50-60wt% of F26 type fluororubber; 8-9wt% of graphite powder; 2-5wt% of magnesium oxide; 1-3wt% of ketimine vulcanizing agent; 5-15wt% of methyl ethyl ketone; 3-6wt% of fluorosilicone oil; 20-25wt% of aluminum powder.

Preferably, the first and second side baffles are strip-like members comprising an abutment portion comprising two mutually parallel abutment surfaces for abutment of the first and second heat exchange panels and a side stop portion extending perpendicular to the abutment surfaces of the abutment portions such that the strip-like members have a T-shaped cross-sectional shape.

Preferably, the heat exchange tube is configured as a flat-shaped heat exchange tube having a cross-sectional aspect ratio greater than 10.

According to another aspect of the present application, there is provided a heat exchanger comprising: the shell comprises two mounting plates which are oppositely arranged, a plurality of first through holes are formed in each mounting plate, and second through holes are formed in two opposite side surfaces perpendicular to the mounting plates; and two ends of each heat exchange tube are respectively connected to the corresponding first through holes on the two mounting plates in a sealing way, wherein at least one of the plurality of heat exchange tubes is any one of the heat exchange tubes.

Preferably, the plurality of heat exchange tubes are arranged such that two heat exchange tubes adjacent in the medium flow direction are at an angle to each other.

Preferably, the included angles are 100 ° -180 °, wherein the size of each included angle is equal, or at least the sizes of two included angles are different from each other.

Preferably, a supporting grid is arranged between the mounting plates, and the supporting grid is formed by intersecting bar-shaped rods and is used for supporting the heat exchange tubes.

Preferably, the bar is made of a composite of metal and PTFE or a composite of metal and F26 type rubber.

According to still another aspect of the present application, there is provided a method of manufacturing a heat exchange tube, including: providing a first heat exchange panel and a second heat exchange panel, the first heat exchange panel and the second heat exchange panel being disposed opposite to each other; providing a first side baffle and a second side baffle, the first side baffle and the second side baffle being disposed opposite each other; the first heat exchange panel, the second heat exchange panel, the first side baffle and the second side baffle are enclosed together to define an interior conduit of the heat exchange tube, wherein the first heat exchange panel, the second heat exchange panel, the first side baffle and the second side baffle are made of at least one of glass, ceramic, graphite, silicon carbide, and wherein at least one of the first heat exchange panel and the second heat exchange panel is separate from at least one of the first side baffle and the second side baffle and is sealingly connected together by an adhesive.

Preferably, the method further comprises: and N middle baffles are arranged in the inner pipeline of the heat exchange pipe, and the middle baffles are connected with the first heat exchange panel and the second heat exchange panel in a sealing way through an adhesive, so that the inner pipeline is divided into N+1 independent inner fluid channels which are sealed with each other, wherein N is an integer greater than or equal to 1.

Preferably, the method further comprises: at least one reinforcing rib for supporting the first and second heat exchange panels is provided in the internal fluid passage, and the at least one reinforcing rib is connected with the first and second heat exchange panels by an adhesive.

By means of the technical scheme, at least one of the following beneficial effects can be achieved:

in the present application, since at least one of the heat exchange panels and at least one of the side shields are separated and connected together by an adhesive, a problem of serious stress concentration caused by the conventional heat exchange tube integrally formed by a drawing process or the like can be avoided. In addition, the adhesive has elasticity, so that the heat exchange tube connected by the adhesive has strong impact resistance and shock resistance, and the problem of stress concentration can be further relieved. On the other hand, because the bonding mode is adopted for forming, complex processes and procedures of melting, drawing, shaping, cutting, grinding and the like which are carried out when the traditional glass tube is manufactured are avoided, thereby simplifying equipment and manufacturing process and reducing manufacturing cost.

Further, in the present application, by providing at least one intermediate baffle in the heat exchange tube, it is possible to divide the inner tube of the heat exchange tube into a plurality of fluid passages, each of which is not in communication with each other because each of which is independent of each other and is sealed from each other, wherein the flowing fluids are not in series flow with each other. Therefore, if one channel fails, the other channels can still independently and normally operate, so that the reliability of the heat exchange tube is greatly improved, and the service life of the heat exchange tube is prolonged. In addition, in the present application, since the intermediate baffle is provided, the inner pipe of the heat exchange pipe can be divided into a plurality of fluid passages, each of which is a passage capable of bearing pressure, and as the number of passages increases, the bearing cross-sectional area of the passage decreases and the bearing capacity increases.

In addition, in this application, through setting up the stiffening rib, can utilize the supporting effect of stiffening rib to carry out the area to the heat exchange tube and strengthen to can further improve the intensity of heat exchange tube, avoid intensity and rigidity of traditional heat exchange tube not enough, the serious defect of heat exchange tube stress concentration.

In addition, in the application, the side baffle plates, the middle baffle plates and the reinforcing ribs are connected with the heat exchange panel through the adhesive, so that the surface area of the parts bonded by the adhesive can be effectively utilized, the heat exchange area is increased, the fluid disturbance is enhanced, and the heat transfer efficiency can be improved.

In addition, in the present application, since at least one material among non-metallic materials such as glass, ceramic, graphite, silicon carbide, etc. is used to manufacture the heat exchange tube, the heat exchange tube is excellent in heat conduction property and corrosion resistance, and most of inorganic acids, organic acids and organic solvents are insufficient to corrode the heat exchange tube of the present application. The adhesive of the present application also has excellent corrosion resistance. Their excellent corrosion resistance enables the heat exchange tubes to operate stably for a long period of time in a corrosive environment.

In addition, in the application, as the heat exchange tubes in the heat exchanger are arranged in a special way to form a plurality of regular zigzag or irregular zigzag flow passages, the flow path of fluid can be increased, and the disturbance of the fluid is increased, so that the heat transfer effect outside the heat exchange tubes is enhanced. The heat exchanger has the advantages of high heat transfer efficiency and compact structure due to the improvement of the heat transfer efficiency and the characteristics of the heat exchange tube with a large length-width ratio.

Drawings

Fig. 1 is a cross-sectional view of a heat exchange tube according to an embodiment of the present application.

Fig. 2 is a schematic structural view of a side baffle of a heat exchange tube according to an embodiment of the present disclosure.

Fig. 3 is a cross-sectional view of a side baffle of a heat exchange tube according to an embodiment of the present application taken along line B-B in fig. 2.

Fig. 4 is a cross-sectional view of a modification of a side shield of a heat exchange tube according to an embodiment of the present application.

Fig. 5 is a cross-sectional view of another modification of the side baffle plate of the heat exchange tube of an embodiment of the present application.

Fig. 6 is a cross-sectional view of still another modification of the side baffle plate of the heat exchange tube of an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a heat exchanger including heat exchange tubes according to an embodiment of the present application.

Fig. 8 is a cross-sectional view of the heat exchanger of the embodiment of fig. 7, taken along section line A-A, showing one embodiment of the arrangement of heat exchange tubes in the heat exchanger.

Fig. 9 to 10 show a modification of the arrangement of the heat exchange tubes in the heat exchanger.

Detailed Description

The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the invention are shown in the drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

Furthermore, it is noted that terms such as front, back, upper, lower, left, right, top, bottom, front, back, and the like used in this application are merely used for ease of description to aid in understanding the relative position or orientation and are not intended to limit the orientation of any apparatus or structure.

The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1 shows a cross-sectional view of a heat exchange tube according to an embodiment of the present application. As shown in fig. 1, the heat exchange tube 100 includes heat exchange panels 103, side baffles 101, optional intermediate baffles 104, and optional stiffening ribs 105.

As shown in fig. 1, the heat exchange panel 103 may include two heat exchange panels, such as the upper and lower heat exchange panels shown in fig. 1. Note that the number of heat exchange panels 103 is not limited to two, and for example, one heat exchange panel may be formed by splicing two or more smaller heat exchange panels. The upper heat exchange panel 103 and the lower heat exchange panel 103 may be disposed opposite to each other. For example, the upper heat exchange panel 103 and the lower heat exchange panel 103 may be disposed parallel to each other, but other arrangements are possible as long as the two heat exchange panels are spaced apart by a certain distance.

In an embodiment, at least one of the upper heat exchange panel 103 and the lower heat exchange panel 103 may be made of at least one of non-metallic materials such as glass, ceramic, graphite, silicon carbide, and the like, for example. Nonmetallic materials such as glass, ceramics, graphite, silicon carbide and the like have good heat conduction performance and corrosion resistance. Preferably, the upper heat exchange panel 103 and the lower heat exchange panel 103 may be made of any one of glass, ceramic, graphite, and silicon carbide. It will be appreciated by those skilled in the art that only one of the upper and lower heat exchange panels 103, 103 may be made of any one of glass, ceramic, graphite, silicon carbide (e.g., glass), and the other of these materials (e.g., ceramic), so long as the heat transfer requirements are met. The heat exchange panel 103 may be configured in a rectangular shape, but other shapes are possible, such as other parallelogram shapes or trapezoid shapes, etc. The upper and lower heat exchange panels may have the same shape and/or size, although they may have different shapes and/or sizes.

As shown in fig. 1, the side barrier 101 may also include two side barriers, such as the left and right side barriers shown in fig. 1. Note that the number of side guards 101 is not limited to two, and for example, one side guard may be spliced from two or more smaller side guards. The side baffles 101 may be disposed at the lateral edges of the upper and lower heat exchange panels 103, such as at the left and right edges, respectively, although other locations are possible, as long as the side baffles 101 and the upper and lower heat exchange panels 103 together define the interior conduits of the heat exchange tubes. The left side baffle 101 and the right side baffle 101 may be disposed opposite to each other. For example, the left side barrier 101 and the right side barrier 101 may be disposed parallel to each other, but other arrangements are possible as long as the two side barriers are spaced apart by a certain distance.

In an embodiment, at least one of the left baffle 101 and the right baffle 101 may be made of at least one of glass, ceramic, graphite, silicon carbide, for example. Preferably, the left side baffle 101 and the right side baffle 101 may each be made of any one of glass, ceramic, graphite, silicon carbide. It will be appreciated by those skilled in the art that only one of the left side baffle 101 and the right side baffle 101 may be made of any one of glass, ceramic, graphite, silicon carbide (e.g., glass), and the other of these materials (e.g., ceramic), so long as the heat transfer requirements are met.

Fig. 2 shows a schematic structural view of a side shield according to an embodiment of the present application. As shown in fig. 2, the side guards may be strip members. The left side baffle and the right side baffle may have the same shape and/or size, although they may have different shapes and/or sizes. For example, the left side baffle and the right side baffle may each be a strip-like member, but of course, only one of them may be a strip-like member, and the other may be a member of another shape.

Fig. 3-6 illustrate cross-sectional views of side guards of various embodiments of the present application taken along line B-B of fig. 2. As shown, the side guards 101 may be T-shaped in cross section (fig. 3-5) or rectangular in cross section (fig. 6). In some embodiments, the side dams 101 comprise an abutment portion (e.g. the right hand portion in fig. 3-5) comprising two mutually parallel abutment surfaces (or called receiving surfaces) for abutment against the upper and lower heat exchange panels 103, 103 and a side dam portion (e.g. the left hand portion in fig. 3-5) extending perpendicular to the abutment surfaces of the abutment portions such that the strip member has a T-shaped cross-sectional shape. The T-shape is shown in fig. 3-5 as a lying T-shape, the vertical portion of which (the left portion in fig. 3-5) may be in the shape of a round segment (fig. 3), a standard rectangular shape (fig. 4), or a rectangular shape with rounded outer edges (fig. 5).

In an embodiment, the cross-sections of the left and right baffles may have the same shape, e.g., the cross-sections of the left and right baffles are in any of the shapes shown in fig. 3-6 at the same time. Of course, the left and right side baffles may not have the same shape in cross-section, e.g., the left side baffle may have a standard T-shape as shown in FIG. 4, while the right side baffle may have a T-shape with rounded outer edges as shown in FIG. 5.

Referring now again to fig. 1, the upper heat exchange panel 103, the lower heat exchange panel 103, the left side baffle 101, and the right side baffle 101 may together enclose an interior space defining an interior conduit of a heat exchange tube. The inner tube is sealed at its periphery and open at both ends for the heat exchange medium to flow therethrough for heat exchange with another heat exchange medium flowing outside the heat exchange tubes. At least one of the upper heat exchange panel 103 and the lower heat exchange panel 103 may be separate from at least one of the left side baffle 101 and the right side baffle 101 and may be sealingly connected together, for example, by an adhesive. Preferably, as shown in fig. 1, the upper heat exchange panel 103, the lower heat exchange panel 103, the left baffle 101 and the right baffle 101 are all separate components, and the upper heat exchange panel 103 and the lower heat exchange panel 103 are each sealingly connected with the left baffle 101 and the right baffle 101 by an adhesive.

Of course, at least one of the upper heat exchange panel 103 and the lower heat exchange panel 103 may also be sealingly connected with at least one of the left side baffle 101 and the right side baffle 101 by other means of connection. For example, the upper heat exchange panel is sealingly joined to the left and right baffles by an adhesive, while the lower heat exchange panel is sealingly joined to the left and right baffles by welding, or the lower heat exchange panel is integrally formed with (i.e., joined to) the left and right baffles themselves. An adhesive may be applied to the receiving surface of the side dams 101 and then the heat exchange panels 103 are sealingly connected to the side dams 101 by the adhesive. According to one embodiment, the heat exchange tube may be constructed as a flat-shaped heat exchange tube having a cross-sectional aspect ratio greater than 10. From theory of heat transfer theory, the larger the aspect ratio, the higher the heat transfer efficiency.

According to the method, the heat exchange tube is not required to be integrally drawn and formed due to the mode of adhesive connection forming, so that the limitation of a manufacturing process of the heat transfer glass tube is broken through, and the problem of serious stress concentration caused by the integral forming of the traditional heat exchange tube due to the drawing process can be avoided. In addition, the adhesive has elasticity, so that the heat exchange tube connected by the adhesive has strong impact resistance and shock resistance, and the problem of stress concentration can be further relieved. On the other hand, because the bonding mode is adopted, the complex processes and procedures of melting, drawing, shaping, cutting, grinding and the like of the traditional glass tube are avoided during manufacturing, thereby simplifying equipment and manufacturing process and reducing manufacturing cost.

Referring again to FIG. 1, the heat exchange tube 100 may also include an intermediate baffle 104. The intermediate baffle 104 is an optional component, i.e., the intermediate baffle 104 may not be provided. Preferably, N intermediate baffles may be disposed in the inner tube of the heat exchange tube to divide the inner tube of the heat exchange tube into n+1 independent inner fluid passages sealed from each other, wherein N is an integer of 1 or more. For example, as shown in fig. 1, an intermediate baffle 104 may be provided at least at a middle position in the length direction of the cross section of the inner tube of the heat exchange tube. The intermediate baffle 104 may be, for example, in the shape of a bar. The intermediate baffle 104 may extend throughout the heat exchange tube, for example, in the longitudinal direction of the heat exchange tube. The middle baffle 104 may be disposed parallel to the left and/or right side baffles, for example.

In an embodiment, the intermediate baffle 104 may be sealingly connected with at least one of the upper heat exchange panel 103 and the lower heat exchange panel 103 by an adhesive. Preferably, the intermediate baffle 104 may be sealingly connected to both the upper heat exchange panel 103 and the lower heat exchange panel 103 by an adhesive. Of course, the intermediate baffle 104 may be sealingly joined to only one of the upper and lower heat exchange panels by an adhesive, and to the other by other means. For example, the intermediate baffle 104 may be sealingly joined to the upper heat exchange panel by an adhesive and sealingly joined to the lower heat exchange panel by welding, or the intermediate baffle 104 itself may be integrally formed with the lower heat exchange panel (i.e., already joined together at the time of forming). An adhesive may be coated on the upper and/or lower surfaces of the intermediate baffle 104, and then the heat exchange panel 103 and the intermediate baffle 104 are sealingly connected together by the adhesive.

According to the present application, since at least one intermediate baffle 104 is provided, it is possible to divide the inner space of the heat exchange tube 100 into several independent inner fluid passages sealed from each other. That is, the internal fluid channels are completely isolated from each other and are not communicated with each other, and the flowing fluids are not in series flow with each other, so that when one channel fails, the other channels can be normally used (for example, the failed channel is blocked), thereby improving the reliability of the heat exchange tube and prolonging the service life of the heat exchange tube. In addition, the internal pipeline of the heat exchange tube can be divided into a plurality of fluid channels by the intermediate baffle, each channel is a channel capable of bearing pressure, and along with the increase of the number of the channels, the pressure-bearing sectional area of the channel is reduced, and the pressure-bearing capacity is improved.

In addition, as shown in FIG. 1, at least one stiffening rib 105 may also be provided in the internal fluid passage defined by the side and middle baffles. The reinforcing ribs 105 are optional members, i.e., the reinforcing ribs 105 may not be provided. According to one embodiment, at least one of the stiffening ribs 105 may be a bar-shaped structure. The strip structure may for example extend in the longitudinal direction of the heat exchange tube 100. For example, the strip structure may extend through the heat exchange tube 100. In this case, the reinforcing rib 105 may be disposed in parallel with the left side barrier and/or the right side barrier. Alternatively, the strip structure may be arranged in an S-shape or a Z-shape within the heat exchange tube 100. According to another embodiment, at least one of the reinforcing ribs 105 may also be a cylindrical structure, which is arranged dispersed in the inner fluid passage of the heat exchange tube. For example, the cylindrical structure may support the upper and lower heat exchange panels of the heat exchange tube 100 in a column manner at a plurality of positions.

In an embodiment, the stiffening rib 105 may be connected with at least one of the upper heat exchange panel 103 and the lower heat exchange panel 103 by an adhesive. Preferably, the reinforcing ribs 105 are attached to both the upper and lower heat exchange panels by an adhesive. Of course, the stiffening rib 105 may also be joined to only one of the upper and lower heat exchange panels by adhesive, and the other by other means. For example, the stiffening rib 105 may be joined to the upper heat exchange panel by an adhesive and to the lower heat exchange panel by welding, or the stiffening rib 105 itself may be integrally formed with the lower heat exchange panel (i.e., already joined together at the time of forming). An adhesive may be coated on the upper and/or lower surfaces of the reinforcing ribs 105, and then the heat exchange panel 103 and the reinforcing ribs 105 are coupled together by the adhesive. The reinforcing ribs 105 have the effects of supporting the heat exchange panel 103, reinforcing fluid disturbance, and enhancing heat transfer, and also have the effects of improving the strength of the heat exchange tube 100 and improving the pressure bearing capacity.

In a preferred embodiment, the present application employs an adhesive that is resistant to high temperatures and has good heat transfer properties. For example, the refractory temperature of the binder may be not lower than 250 ℃, and the heat transfer property of the binder may be not lower than the heat transfer property of a base material of a member to which the binder is bonded (such as the above-mentioned nonmetallic materials having good heat transfer properties, such as glass, ceramics, graphite, silicon carbide, etc.). Preferably, the components of the binder of the present application may include: 50-60wt% of F26 type fluororubber; 8-9wt% of graphite powder; 2-5wt% of magnesium oxide; 1-3wt% of ketimine vulcanizing agent; 5-15wt% of methyl ethyl ketone; 3-6wt% of fluorosilicone oil; 20-25wt% of aluminum powder, wherein the symbol wt% represents weight percentage. It will be appreciated by those skilled in the art that other components may be included in the above-described binders as desired. For example, in one embodiment, the binder may also include 0 to 1wt% dibutyltin dilaurate, preferably 0.5wt% dibutyltin dilaurate.

The adhesive has good elasticity, strong impact and vibration resistance, can reduce thermal stress at high temperature, and is particularly suitable for bonding brittle materials or materials with very different linear expansion coefficients, such as bonding and sealing between nonmetallic materials such as glass, ceramics, graphite, silicon carbide and the like or between nonmetallic materials and metals and the like. In addition, the adhesive has good heat conduction performance and high temperature resistance, and also has good corrosion resistance, so that the surface area of the adhered part adhered by the adhesive can be effectively utilized, the heat exchange area is increased, the fluid disturbance is strengthened, and the heat transfer efficiency is improved.

Embodiments of the heat exchanger of the present application are described in detail below with reference to fig. 7-10.

Fig. 7 shows a front view of the structure of the heat exchanger 1 of an embodiment of the present application. The view is a schematic cross-section taken along a longitudinal section of the heat exchange tube. As shown in fig. 7, the heat exchanger 1 includes a housing 2 and a plurality of heat exchange tubes provided in the housing 2, at least one of which may be the heat exchange tube 100 as described above. The housing 2 may, for example, be substantially box-shaped. The housing 2 comprises two mounting plates 4, 4 arranged opposite each other. The mounting plates 4 are each formed with a plurality of first through holes (not shown in the drawings). Both ends of each heat exchange tube are respectively hermetically connected to corresponding first through holes of the two mounting plates 4, thereby providing a flow passage of a first fluid (e.g., air). As shown in fig. 7, a first fluid may enter the heat exchange tube from one side (e.g., left side) of the mounting plate 4, flow through the heat exchange tube while exchanging heat with a second fluid (e.g., flue gas) outside the heat exchange tube, and then flow out from the other side (e.g., right side) of the mounting plate 4.

In a preferred embodiment, as shown in fig. 7, a support grid 6 may also optionally be provided between the mounting plates 4. The support grid 6 may be formed of bar-shaped bars arranged to cross each other for supporting the heat exchange tube 100. The support grid 6 can improve the rigidity and strength of the heat exchange tube 100, thereby improving the reliability of the heat exchange tube 100. The bar-shaped rod piece can be made of a material or a composite material with lower surface hardness. For example, the bar may be made of a composite of metal and PTFE or a composite of metal and F26 type rubber. In this way, the support grid 6 can be prevented from colliding against the heat exchange tube 100 to cause damage.

Fig. 8 shows a cross-sectional view of the heat exchanger of the embodiment of fig. 7, taken along the line A-A. This view is the left view corresponding to the view shown in fig. 7. As shown in fig. 8, the housing 2 is provided with second through holes (not shown) in two oppositely arranged side faces 5, 5 perpendicular to the mounting plates 4, 4. Outside the heat exchange tubes, the spaces between the heat exchange tubes and the housing 2 form flow channels for the second fluid. As shown in fig. 8, a second fluid (e.g., flue gas) may enter the flow channel of the second fluid from one side (e.g., left side, corresponding to the rear side of fig. 7), flow through the flow channel of the second fluid while exchanging heat with a first fluid (e.g., air) within the heat exchange tube, and then flow out from the other side (e.g., right side, corresponding to the front side of fig. 7).

As shown in fig. 7 and 8, the heat exchange tubes of the heat exchanger 1 may be all employed with the heat exchange tube 100 as described above, for example. It should be understood that the heat exchanger of the present application is not limited to the heat exchange tube 100 described in the above embodiments, but may be a portion of a heat exchange tube using conventional heat exchange tubes well known to those skilled in the art.

As shown in fig. 8, the plurality of heat exchange tubes in the heat exchanger 1 may be arranged such that two heat exchange tubes adjacent in the flow direction of the medium (e.g., in the second fluid outside the heat exchange tubes) form an angle α with each other. These angles alternately form a plurality of zigzag flow channels in turn. The flow channels may be parallel to each other. The angle α may be, for example, 100 ° -180 °. As shown in fig. 8, each included angle α is equal, thereby forming a regular "zigzag" flow path. However, the present application is not limited to the case where each of the included angles α is equal, but there may be the case where at least two included angles are not equal to each other. For example, fig. 9 to 10 show a modification of the arrangement of the heat exchange tubes of the embodiment shown in fig. 8. As shown in fig. 9-10, the plurality of heat exchange tubes may be arranged such that at least two of all included angles formed along the flow direction of the medium (e.g., along the second fluid outside the heat exchange tubes) are not equal to each other, thereby forming an irregular zigzag, i.e., meandering flow path. According to the heat exchanger, the flow paths can be increased by the regular zigzag flow paths and the irregular zigzag flow paths, so that the disturbance of fluid is increased, and the heat transfer effect of the heat exchanger is further improved.

The plurality of heat exchange tubes in the heat exchanger shown in fig. 8 to 10 are arranged in a plurality of columns, each including a plurality of heat exchange tubes arranged in a width direction (e.g., up-down direction in the drawing) of a cross section of the heat exchange tubes. Therefore, the heat exchange tube can have smaller cross section length, which is beneficial to ensuring the mechanical strength of the heat exchange tube. In addition, the heat exchange tubes arranged in a whole row are beneficial to increasing the heat exchange area and increasing the disturbance of fluid, and are beneficial to further improving the heat exchange efficiency.

Although fig. 8-10 each show a heat exchanger having multiple rows of heat exchange tubes. However, the present application is not limited to a plurality of rows of heat exchange tubes. In the heat exchanger, only one row of heat exchange tubes may be arranged. Each heat exchange tube in the array has a large cross-sectional length so as to substantially span between the sides 5, 5 in the heat exchanger.

The heat exchange tubes employed in the heat exchangers described above with reference to fig. 7 to 10 are all of the same shape, however, the present application is not limited thereto, and the heat exchange tubes in the heat exchangers according to the embodiments of the present application may have different shapes from each other. For example, the heat exchange tubes in the same column have the same shape; and the heat exchange tubes of different two rows may have different shapes. For example, the heat exchange tubes in one column may be undulating shaped heat exchange tubes, while the heat exchange tubes in another column may be straight shaped heat exchange tubes. Since differently shaped heat exchange tubes are used in different columns, the shape of the flow channels formed between the heat exchange tubes and the housing varies in the direction of fluid (e.g., the second fluid) flow. This helps to increase turbulence in the fluid and thus heat exchange efficiency. The increase in thermal efficiency also enables one to reduce the volume of the heat exchanger.

It should be understood that the structure of the heat exchanger according to the embodiments of the present application is not limited to the specific details described above, for example, it is not limited to a combination of heat exchange tubes having an undulating shape with heat exchange tubes having a straight shape, but it may also be a combination of heat exchange tubes having different undulating shapes. In addition, the heat exchanger according to the embodiment of the application is not limited to the case that the same heat exchange tube is adopted by the heat exchange tubes in the same column, as long as the adoption of the heat exchange tubes in different shapes can cause disturbance of fluid, thereby improving heat exchange efficiency.

According to another aspect of the present application, there is also provided a method of manufacturing a heat exchange tube, which may include: providing an upper heat exchange panel 103 and a lower heat exchange panel 103, the upper heat exchange panel 103 and the lower heat exchange panel 103 being disposed opposite to each other; providing a left side baffle 101 and a right side baffle 101, the left side baffle 101 and the right side baffle 101 being disposed opposite to each other; the upper heat exchange panel 103, the lower heat exchange panel 103, the left baffle 101 and the right baffle 101 are enclosed together to define an interior conduit of the glass heat exchange tube, wherein the upper heat exchange panel 103, the lower heat exchange panel 103, the left baffle 101 and the right baffle 101 are made of at least one of glass, ceramic, graphite, silicon carbide, and wherein at least one of the upper heat exchange panel 103 and the lower heat exchange panel 103 is separate from at least one of the left baffle 101 and the right baffle 101 and sealingly connected together by an adhesive. Preferably, the heat exchange panel 103 and the side baffle 101 may be the heat exchange panel 103 and the side baffle 101 described in the above embodiments, respectively.

According to a preferred embodiment, the above method may further comprise: n intermediate baffles 104 are arranged in the inner pipeline of the heat exchange pipe, and the intermediate baffles 104, the upper heat exchange panel 103 and the lower heat exchange panel 103 are connected together in a sealing way through the adhesive, so that the inner pipeline is divided into N+1 independent inner fluid channels which are sealed with each other, wherein N is an integer greater than or equal to 1. Preferably, the intermediate baffle 104 may be the intermediate baffle 104 described in the above embodiments.

According to a preferred embodiment, the above method may further comprise: at least one stiffening rib 105 is provided in the inner fluid channel, the at least one stiffening rib 105 being connected to the upper and lower heat exchanger panels 103, 103 by means of the adhesive. Preferably, the reinforcing rib 105 may be the reinforcing rib 105 described in the above embodiment.

In a preferred embodiment, the present application employs an adhesive that is resistant to high temperatures and has good heat transfer properties. For example, the refractory temperature of the binder may be not lower than 250 ℃, and the heat transfer property of the binder may be not lower than the heat transfer property of a base material (such as the above-mentioned nonmetallic materials with good heat transfer properties, such as glass, ceramics, graphite, silicon carbide, etc.) to which the binder is bonded. Preferably, the components of the binder of the present application may include: 50-60wt% of F26 type fluororubber; 8-9wt% of graphite powder; 2-5wt% of magnesium oxide; 1-3wt% of ketimine vulcanizing agent; 5-15wt% of methyl ethyl ketone; 3-6wt% of fluorosilicone oil; 20-25wt% of aluminum powder, wherein the symbol wt% represents weight percentage. It will be appreciated by those skilled in the art that other components may be included in the above-described binders as desired. For example, in one embodiment, the binder may also include 0 to 1wt% dibutyltin dilaurate, preferably 0.5wt% dibutyltin dilaurate.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. A heat exchange tube, comprising:

a first heat exchange panel and a second heat exchange panel disposed opposite to each other;

a first side baffle and a second side baffle, the first side baffle and the second side baffle being disposed opposite each other,

wherein the first heat exchange panel, the second heat exchange panel, the first side baffle and the second side baffle are enclosed together to define an inner pipeline of the heat exchange tube,

wherein the first heat exchange panel, the second heat exchange panel, the first side baffle and the second side baffle are made of at least one material of glass, ceramic, graphite and silicon carbide, and

wherein at least one of the first and second heat exchange panels is separate from at least one of the first and second side baffles and sealingly connected together by an adhesive having elasticity.

2. The heat exchange tube of claim 1, wherein N intermediate baffles are disposed in the interior conduit of the heat exchange tube, the intermediate baffles being sealingly connected to the first and second heat exchange panels by an adhesive dividing the interior conduit into n+1 independent internal fluid passages sealed from each other, wherein N is an integer greater than or equal to 1.

3. The heat exchange tube of claim 2, wherein at least one stiffening rib is further provided in the internal fluid passage for supporting the first and second heat exchange panels, the at least one stiffening rib being connected to the first and second heat exchange panels by an adhesive.

4. A heat exchange tube according to any one of claims 1 to 3 wherein the first heat exchange panel, the second heat exchange panel, the first side baffle and the second side baffle are each separate components and the first heat exchange panel and the second heat exchange panel are each sealingly connected to the first side baffle and the second side baffle by an adhesive.

5. A heat exchange tube according to any one of claims 1 to 3, wherein the binder has a refractory temperature of not less than 250 ℃ and a heat transfer property of not less than that of the base material of the member to which the binder is bonded.

6. The heat exchange tube of claim 5, wherein the composition of the binder comprises: 50-60wt% of F26 type fluororubber; 8-9wt% of graphite powder; 2-5wt% of magnesium oxide; 1-3wt% of ketimine vulcanizing agent; 5-15wt% of methyl ethyl ketone; 3-6wt% of fluorosilicone oil; 20-25wt% of aluminum powder.

7. A heat exchange tube according to any one of claims 1-3, wherein the first and second side baffles are strip-like members comprising an abutment portion comprising two mutually parallel abutment surfaces for abutment of the first and second heat exchange panels and a side stop portion extending perpendicularly to the abutment surfaces of the abutment portions such that the strip-like members have a T-shaped cross-sectional shape.

8. A heat exchange tube according to any one of claims 1 to 3, wherein the heat exchange tube is configured as a flat-shaped heat exchange tube having a cross-sectional aspect ratio of greater than 10.

9. A heat exchanger, comprising:

the shell comprises two mounting plates which are oppositely arranged, a plurality of first through holes are formed in each mounting plate, and second through holes are formed in two opposite side surfaces perpendicular to the mounting plates; and

a plurality of heat exchange tubes, two ends of each heat exchange tube are respectively connected to corresponding first through holes on the two mounting plates in a sealing way,

at least one of the plurality of heat exchange tubes is a heat exchange tube according to any one of claims 1 to 8.

10. The heat exchanger of claim 9, wherein the plurality of heat exchange tubes are arranged such that two heat exchange tubes adjacent in the direction of flow of the medium are at an angle to each other.

11. The heat exchanger of claim 10, wherein the included angles are 100 ° -180 °, wherein each included angle is equal in size or at least two included angles are unequal in size.

12. A heat exchanger according to any one of claims 9 to 11, wherein a support grid is provided between the mounting plates, the support grid being formed by intersecting bar-shaped bars for supporting the heat exchange tubes.

13. The heat exchanger of claim 12, wherein the bar members are made of a composite of metal and PTFE or a composite of metal and F26 type rubber.

14. A method of manufacturing a heat exchange tube, comprising:

providing a first heat exchange panel and a second heat exchange panel, the first heat exchange panel and the second heat exchange panel being disposed opposite to each other;

providing a first side baffle and a second side baffle, the first side baffle and the second side baffle being disposed opposite each other;

the first heat exchange panel, the second heat exchange panel, the first side baffle and the second side baffle are enclosed together to define an inner pipeline of the heat exchange tube,

15. The method of manufacturing a heat exchange tube of claim 14, further comprising: and N middle baffles are arranged in the inner pipeline of the heat exchange pipe, and the middle baffles are connected with the first heat exchange panel and the second heat exchange panel in a sealing way through an adhesive, so that the inner pipeline is divided into N+1 independent inner fluid channels which are sealed with each other, wherein N is an integer greater than or equal to 1.

16. The method for manufacturing a heat exchange tube according to claim 15, further comprising: at least one reinforcing rib for supporting the first and second heat exchange panels is provided in the internal fluid passage, and the at least one reinforcing rib is connected with the first and second heat exchange panels by an adhesive.

17. A method of manufacturing a heat exchange tube according to any one of claims 14 to 16, wherein the composition of the binder comprises: 50-60wt% of F26 type fluororubber; 8-9wt% of graphite powder; 2-5wt% of magnesium oxide; 1-3wt% of ketimine vulcanizing agent; 5-15wt% of methyl ethyl ketone; 3-6wt% of fluorosilicone oil; 20-25wt% of aluminum powder.