Heat exchange tube, heat exchanger and method for manufacturing heat exchange tube

Abstract

The present invention provides a heat exchange tube, a heat exchanger and a method for manufacturing a heat exchange tube. The heat exchange tube includes: a first panel and a second panel arranged opposite to each other; and an outer baffle and an inner baffle arranged between the first panel and the second panel. The outer baffle is arranged on the outer side of the inner baffle, and the inner baffle is enclosed with the first panel and the second panel on the side opposite to the outer baffle to form a heat exchange flow channel, and the heat exchange tube also includes a seal arranged between the outer baffle and the inner baffle to block the transfer of the medium between the outer baffle and the inner baffle. According to the heat exchange tube, the heat exchanger and the method for manufacturing a heat exchange tube of the present invention, by arranging a seal between the outer baffle and the inner baffle to block the transfer of the medium between the outer baffle and the inner baffle, the leakage resistance when the heat exchange medium leaks is increased, the leakage amount is reduced, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present invention relates to a heat exchange device in the field of heat transfer technology, and in particular to a heat exchange tube with improved anti-leakage capability, a heat exchanger comprising the heat exchange tube, and a method for manufacturing the heat exchange tube. Background Art

[0002] Glass tubes have excellent corrosion resistance, especially round glass tubes, which are used as heat exchange tubes in heat exchange devices due to their mature manufacturing process and low cost. However, round glass tubes have the disadvantages of low heat exchange efficiency and insufficient structural compactness. Flat glass tubes can overcome the disadvantages of round glass tubes, but due to the limitation of the drawing process, the qualified rate is extremely low when the cross-sectional aspect ratio is large, and based on the characteristics of glass, the larger the aspect ratio, the more serious the stress concentration of the drawn flat glass tube, and the higher the failure rate when used as a heat exchange tube.

[0003] The plate-and-tube heat exchangers that have emerged in recent years have the advantages of high heat exchange efficiency, compact structure, easy maintenance, and low heat exchange medium leakage rate. However, the components in the heat exchange tubes may deform or be damaged in a high-temperature working environment or when the working temperature changes, resulting in heat exchange tube failure, heat exchange medium leakage, reduced heat exchange efficiency, and reduced energy recovery rate. Summary of the invention

[0004] The object of the present invention is to at least partially overcome the above-mentioned deficiencies by providing a heat exchange tube, a heat exchanger and a method for manufacturing the heat exchange tube.

[0005] According to one aspect of the present invention, there is provided a heat exchange tube, comprising: a first panel and a second panel arranged opposite to each other; and an outer baffle and an inner baffle arranged between the first panel and the second panel, wherein the outer baffle is arranged on the outer side of the inner baffle, and the inner baffle is enclosed with the first panel and the second panel on the side opposite to the outer baffle to form a heat exchange flow channel, and the heat exchange tube also includes a seal arranged between the outer baffle and the inner baffle for blocking the transfer of medium between the outer baffle and the inner baffle.

[0006] In an exemplary embodiment, the seal comprises a solid formed sealing material.

[0007] In an exemplary embodiment, the seal is a packing formed by braiding flexible wires.

[0008] In an exemplary embodiment, the sealing member is formed by curing a liquid sealant.

[0009] In an exemplary embodiment, the ratio of the thermal conductivity of the seal to the thermal conductivity of any one of the outer baffle and the inner baffle is less than or equal to 1:2, preferably less than or equal to 1:5, and more preferably less than or equal to 1:10.

[0010] In an exemplary embodiment, the first panel, the second panel, the outer baffle, and the inner baffle are made of at least one of glass, ceramic, graphite, and silicon carbide.

[0011] In an exemplary embodiment, the seal comprises an inorganic sealing material, preferably asbestos or ceramic fiber.

[0012] In an exemplary embodiment, the seal comprises an organic sealing material, preferably polytetrafluoroethylene, polyimide or silicone rubber.

[0013] In an exemplary embodiment, the ratio of the interval between the outer baffle plate and the inner baffle plate to the width of the heat exchange flow channel is less than or equal to 1:10, preferably 1:30 to 1:20.

[0014] In an exemplary embodiment, the interval between the outer baffle and the inner baffle is less than or equal to 10 mm, preferably less than or equal to 8 mm, and more preferably less than or equal to 5 mm.

[0015] In an exemplary embodiment, the spacing between the outer baffle and the inner baffle is greater than or equal to 1 mm, preferably greater than or equal to 2 mm, and more preferably greater than or equal to 3 mm, so that the seal is disposed between the outer baffle and the inner baffle.

[0016] In an exemplary embodiment, the outer side guard and the inner side guard are separate from at least one of the first panel and the second panel and are connected together by an adhesive.

[0017] In an exemplary embodiment, the width of the outer side baffle is smaller than the width of the inner side baffle.

[0018] In an exemplary embodiment, the ratio of the sum of the width of the outer baffle, the width of the inner baffle and the distance between the outer baffle and the inner baffle to the width of the first panel and the second panel is less than or equal to 1:5, preferably less than or equal to 1:10.

[0019] In an exemplary embodiment, the outer baffle and the inner baffle are arranged on a first side of the first panel and the second panel, and the heat exchange tube further includes a single opposite side baffle arranged on a second side opposite to the first side, for enclosing with the first panel and the second panel to form a heat exchange flow channel.

[0020] In an exemplary embodiment, the inner baffle includes a first inner baffle and a second inner baffle, the outer baffle includes a first outer baffle and a second outer baffle, the first inner baffle is disposed between the first outer baffle and the second inner baffle, and the second inner baffle is disposed between the first inner baffle and the second outer baffle.

[0021] In an exemplary embodiment, a distance between the first outer side baffle and the first inner side baffle is greater than a distance between the second outer side baffle and the second inner side baffle.

[0022] In an exemplary embodiment, a seal disposed between the first outer baffle plate and the first inner baffle plate has a thermal conductivity that is lower than a thermal conductivity of a seal disposed between the second outer baffle plate and the second inner baffle plate.

[0023] In an exemplary embodiment, the heat exchange tube is an air-to-air heat exchange tube.

[0024] According to another aspect of the present invention, there is provided a heat exchanger, comprising: a shell, the shell comprising two mounting plates arranged opposite to each other, a plurality of first through holes being formed on the mounting plates respectively, and second through holes being formed on two oppositely arranged side surfaces of the shell perpendicular to the mounting plates; and a plurality of heat exchange tubes, both ends of each heat exchange tube being respectively sealed and connected to the corresponding first through holes of the mounting plates, wherein at least one of the plurality of heat exchange tubes is any one of the heat exchange tubes described above.

[0025] In an exemplary embodiment, the heat exchanger is an air preheater.

[0026] According to another aspect of the present invention, a method for manufacturing a heat exchange tube is provided, comprising: providing a first panel and a second panel arranged opposite to each other; providing an outer baffle and an inner baffle arranged between the first panel and the second panel, arranging the outer baffle on the outside of the inner baffle, and making the inner baffle enclose the first panel and the second panel on the side opposite to the outer baffle to form a heat exchange flow channel; and arranging a seal between the outer baffle and the inner baffle to block the transfer of medium between the inner baffle and the outer baffle.

[0027] By means of the above technical solution of the present invention, at least the following beneficial technical effects can be achieved:

[0028] According to the heat exchange tube and heat exchanger of the present invention, by arranging a seal between the outer baffle and the inner baffle to block the medium transfer between the outer baffle and the inner baffle, the leakage resistance when the heat exchange medium leaks is increased, the leakage amount is reduced, and the heat exchange efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0030] Figure 1 is a cross-sectional view of a first embodiment of a heat exchange tube according to the present invention;

[0031] Figure 2 is a cross-sectional view of a second embodiment of a heat exchange tube according to the present invention;

[0032] Figure 3a is a cross-sectional view of a third embodiment of a heat exchange tube according to the present invention;

[0033] Figure 3b is a perspective view of a third embodiment of a heat exchange tube according to the present invention;

[0034] Figure 3c is a top view of a third embodiment of a heat exchange tube according to the present invention;

[0035] Figure 4 is a cross-sectional view of a fourth embodiment of a heat exchange tube according to the present invention;

[0036] Figure 5 is a schematic structural diagram of a heat exchanger according to the present invention; and

[0037] Figure 6 is a schematic flow chart of a method for manufacturing a heat exchange tube according to the present invention. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0039] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "center", "longitudinal", "lateral", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, components or parts to have a specific direction, or to be constructed and operated in a specific direction.

[0040] Figure 1 is a cross-sectional view of a first embodiment of a heat exchange tube according to the present invention.

[0041] refer to Figure 1According to the first embodiment of the heat exchange tube of the present invention, the heat exchange tube 10 includes a first panel 111 and a second panel 112 disposed opposite to each other, and an outer baffle 120 and an inner baffle 130 disposed between the first panel 111 and the second panel 112. The outer baffle 120 is disposed on the outer side of the inner baffle 130. The inner baffle 130 is enclosed with the first panel 111 and the second panel 112 on the side opposite to the outer baffle 120 to form a heat exchange flow channel 140. The heat exchange tube 10 also includes a seal 150. The seal 150 is disposed between the outer baffle 120 and the inner baffle 130, and is used to block the transfer of the medium between the outer baffle 120 and the inner baffle 130.

[0042] like Figure 1 As shown, the heat exchange tube 10 may include two panels, for example, Figure 1 The first panel 111 and the second panel 112 are shown in FIG. It should be noted that the number of panels in the heat exchange tube 10 is not limited to two. For example, one of the first panel 111 and the second panel 112 can be formed by splicing two or more smaller panels.

[0043] In some embodiments, one of the first panel 111 and the second panel 112 may have an L-shaped or U-shaped cross-sectional shape with two arms of different lengths, and the other may have a flat plate shape, and the two may be spliced ​​to form a U-shaped cross-sectional shape with two arms of equal length. In other embodiments, the heat exchange tube 10 may include a single panel bent into a U shape. In these embodiments, the outer baffle 120 and the inner baffle 130 are arranged on the opening side of the U-shaped cross-sectional shape, and the inner baffle 130 and the first panel 111 and the second panel 112 (or a single panel) may be enclosed to form a heat exchange flow channel 140. The seal 150 is between the outer baffle 120, the inner baffle 130, and the first panel 111 and the second panel 112 (or a single panel), and is used to block the transfer of the medium between the outer baffle 120 and the inner baffle 130.

[0044] like Figure 1 As shown, the outer baffle 120 and the inner baffle 130 are disposed on the first side (eg, Figure 1 The heat exchange tube 10 may further include a single opposite side baffle 120'. The opposite side baffle 120' is disposed on a second side (eg, Figure 1 ), and together with the first panel 111 and the second panel 112 form a heat exchange channel 140.

[0045] like Figure 1As shown, the inner baffle 130, the opposite baffle 120', the first panel 111 and the second panel 112 can enclose a heat exchange channel 140, and a seal 150 can be disposed between the outer baffle 120, the inner baffle 130, the first panel 111 and the second panel 112. In this case, the heat exchange tube 10 includes only one heat exchange channel 140 and one seal 150.

[0046] like Figure 1 As shown, the first panel 111 and the second panel 112 can be arranged opposite to each other. For example, the first panel 111 and the second panel 112 can be arranged parallel to each other, but other arrangements are also feasible as long as the two panels are spaced a certain distance apart from each other.

[0047] In an embodiment of the present invention, the first panel 111 and the second panel 112 may have a rectangular shape, but other shapes are also feasible, such as other parallelogram shapes or trapezoidal shapes, etc. The first panel 111 and the second panel 112 may have the same shape and / or size, and of course they may also have different shapes and / or sizes.

[0048] In an embodiment of the present invention, the first panel 111 , the second panel 112 , the outer baffle 120 , and the inner baffle 130 may be made of at least one of glass, ceramic, graphite, and silicon carbide.

[0049] In an embodiment of the present invention, at least one of the first panel 111 and the second panel 112 may be made of at least one of non-metallic materials such as glass, ceramics, graphite, silicon carbide, etc. Non-metallic materials such as glass, ceramics, graphite, silicon carbide have good thermal conductivity and corrosion resistance. In some examples, the first panel 111 and the second panel 112 may be made of any one of glass, ceramics, graphite, and silicon carbide. In other examples, one of the first panel 111 and the second panel 112 may be made of any one of glass, ceramics, graphite, and silicon carbide (e.g., glass), and the other may be made of another of these materials (e.g., ceramics), as long as the heat transfer requirements can be met.

[0050] In one embodiment, at least one of the outer baffle plate 120 and the inner baffle plate 130 may be made of at least one of glass, ceramic, graphite, and silicon carbide. In some examples, the outer baffle plate 120 and the inner baffle plate 130 may both be made of any one of glass, ceramic, graphite, and silicon carbide. In other examples, one of the outer baffle plate 120 and the inner baffle plate 130 may be made of any one of glass, ceramic, graphite, and silicon carbide (e.g., glass), and the other may be made of another of these materials (e.g., ceramic), as long as the heat transfer requirements can be met.

[0051] In an embodiment of the present invention, the sealing member 150 may be disposed between the first panel 111 , the second panel 112 , the outer baffle 120 , and the inner baffle 130 , and play a sealing role.

[0052] When the heat exchange tube 10 is working, the first heat exchange medium (such as low temperature air) flows inside the heat exchange tube 10 (inside the heat exchange flow channel 140), and the second heat exchange medium (such as high temperature flue gas) flows outside the heat exchange tube 10, and the first heat exchange medium and the second heat exchange medium exchange heat through the heat exchange tube 10. In a high temperature working environment, the components may be deformed, ablated or damaged, and a gap may appear at the sealed connection between the outer baffle 120 and the first panel 111 and the second panel 112. Due to the appearance of the gap, the first heat exchange medium inside the heat exchange tube 10 may leak to the outside of the heat exchange tube 10 through the gap, or the second heat exchange medium outside the heat exchange tube 10 may leak to the inside of the heat exchange tube 10 through the gap. However, due to the presence of the seal 150, the first heat exchange medium inside the heat exchange tube 10 needs to pass through the sealed connection between the inner baffle 130 and the first panel 111 and the second panel 112 and the gap between the seal 150 and the first panel 111 and the second panel 112 to reach the outside of the heat exchange tube 10. Alternatively, the second heat exchange medium outside the heat exchange tube 10 needs to pass through the gap between the seal 150 and the first panel 111 and the second panel 112 and the sealed connection between the inner baffle 130 and the first panel 111 and the second panel 112 to reach the inside of the heat exchange tube 10.

[0053] By providing a seal 150 between the outer baffle 120 and the inner baffle 130, the resistance to leakage of the first heat exchange medium to the outside of the heat exchange tube 10 or the resistance to leakage of the second heat exchange medium to the inside of the heat exchange tube 10 can be increased, thereby reducing the leakage of the first heat exchange medium or the second heat exchange medium.

[0054] For example, when the first heat exchange medium inside the heat exchange tube 10 is low-temperature air and the second heat exchange medium outside the heat exchange tube 10 is high-temperature flue gas, the high-temperature flue gas is usually in a negative pressure state. When a gap appears at the sealed connection between the outer baffle 120 and the first panel 111 and the second panel 112, the low-temperature air will leak from the inside of the heat exchange tube 10 to the outside. In this case, the seal 150 can increase the resistance of the low-temperature air from the inside of the heat exchange tube 10 to the outside, and can reduce the leakage of the low-temperature air. This can not only avoid the increase of the oxygen content of the second heat exchange medium outside the heat exchange tube 10, but also avoid the decrease of the heat exchange efficiency and energy recovery rate of the heat exchange tube 10.

[0055] In an embodiment of the present invention, the seal 150 may include a solid-molded sealing material. If the seal 150 is made of a solid-molded sealing material, when a gap appears between the outer baffle 120 and the first panel 111 and the second panel 112, causing leakage, the seal 150 can be used to block the gap between the outer baffle 120 and the inner baffle 130, thereby preventing the leakage of the heat exchange medium and reducing the leakage amount. In addition, when the seal 150 is made of a solid-molded sealing material, the corresponding seal 150 can be easily replaced separately as needed. It can be seen that by using the seal 150 made of a solid-molded sealing material, when a leak is detected in the heat exchange tube 10, the seal 150 can be used to repair the corresponding heat exchange tube 10, which significantly reduces the repair time and maintenance cost.

[0056] In an embodiment of the present invention, the seal 150 may be a packing formed by weaving a flexible thread-like object. For example, the seal 150 may be a packing having a strip or rope shape formed by weaving a relatively soft thread-like object, and generally has a square, rectangular or circular cross-sectional shape. In this case, the seal 150 may be flexible and in a strip or rope shape. When a leak is detected in the heat exchange tube 10, the seal 150 may be filled between the outer baffle 120 and the inner baffle 130 by pulling or pushing, so that the heat exchange tube 10 can be repaired in a quick and easy manner instead of directly replacing the heat exchange tube 10. Similarly, the strip or rope-like seal 150 is also easy to be extracted or replaced from the heat exchange tube 10. In addition, when plugging or replacing, the flexible seal 150 can avoid damage to the panel or baffle of the heat exchange tube 10 or damage to the sealing performance.

[0057] In an embodiment of the present invention, the seal 150 can be formed by curing a liquid sealant. For example, in the manufacturing process of the heat exchange tube of the present invention, after the outer baffle 120 and the inner baffle 130 are arranged on the first panel 111, the liquid sealant is applied to the groove formed by the outer baffle 120, the inner baffle 130 and the first panel 111 by injection, coating, etc. The sealant applied in the groove is cured by evaporation, heating, application of light, etc. Then, the second panel 112 is placed opposite to and fixed to the first panel 111, thereby forming, for example Figure 1 The heat exchange tube 10 is shown.

[0058] In the above embodiment, the seal 150 according to the embodiment of the present invention is described by taking a solid-molded seal material and a solidified liquid sealant as examples. However, the seal 150 of the present invention is not limited thereto, but can be any form of seal material that can be stably disposed between the outer baffle 120 and the inner baffle 130 when the heat exchange tube 10 is working to increase the leakage resistance of the heat exchange medium.

[0059] In the embodiment of the present invention, the seal 150 also plays a role in increasing thermal resistance between the first panel 111, the second panel 112, the outer baffle 120 and the inner baffle 130. In this case, the seal 150 can effectively reduce or block the heat transfer from the outer baffle 120 to the inner baffle 130 caused by the second heat exchange medium such as high-temperature flue gas. Therefore, the internal components of the heat exchange tube can be prevented from being deformed or damaged due to high temperature or temperature changes, thereby improving the temperature resistance of the heat exchange tube, extending the service life, reducing the failure rate and improving the heat exchange efficiency.

[0060] In an embodiment of the present invention, the ratio of the thermal conductivity of the seal 150 to the thermal conductivity of any one of the outer baffle 120 and the inner baffle 130 may be less than or equal to 1:2, preferably less than or equal to 1:5, and more preferably less than or equal to 1:10. The seal 150 may be made of any temperature-resistant and corrosion-resistant material. The seal 150 preferably has a lower thermal conductivity. For example, the thermal conductivity of these materials themselves is much lower than that of glass itself, such as the thermal conductivity of polytetrafluoroethylene is 0.27W / (m·K), the thermal conductivity of silicone rubber is generally below 0.27W / (m·K), and the thermal conductivity of ceramic fiber is 0.03W / (m·K), while the thermal conductivity of glass is 0.7-1.3W / (m·K). Under the same other conditions, such as the same flue gas temperature and flow rate and the same temperature of the outer baffle, the heat transferred to the inner baffle through the outer baffle through the polytetrafluoroethylene packing is only 1 / 3 or less of that of glass. This can greatly reduce the outer wall temperature of the inner baffle, thereby reducing the temperature of the inner baffle and extending its service life.

[0061] In an embodiment of the present invention, the sealing member 150 may include an inorganic sealing material, preferably may include asbestos or ceramic fiber. For example, the sealing member 150 may include asbestos packing or ceramic fiber packing.

[0062] In an embodiment of the present invention, the sealing member 150 may include an organic sealing material, and preferably may include polytetrafluoroethylene, polyimide or silicone rubber.

[0063] In the context of the present invention, the width may be defined as the lateral dimension in a cross section perpendicular to the extension direction of the heat exchange channel, the height may be defined as the vertical dimension in a cross section perpendicular to the extension direction of the heat exchange channel, and the thickness may be defined as the dimension in the extension direction of the heat exchange channel. Figure 1 As shown, width may refer to the dimension along the Y direction, height may refer to the dimension along the Z direction, and thickness may refer to the dimension along the X direction.

[0064] In an embodiment of the present invention, the ratio of the interval between the outer baffle 120 and the inner baffle 130 to the width of the heat exchange channel 140 may be less than or equal to 1:10, preferably 1:30 to 1:20. The interval between the outer baffle 120 and the inner baffle 130 may be less than or equal to 10 mm, preferably less than or equal to 8 mm, and more preferably less than or equal to 5 mm. When the seal 150 is not disposed between the outer baffle 120 and the inner baffle 130, the space between the outer baffle 120 and the inner baffle 130 is filled with the first heat exchange medium. The interval between the outer baffle 120 and the inner baffle 130 is set according to the above size, and the flow rate of the first heat exchange medium between the outer baffle 120 and the inner baffle 130 is much lower than the flow rate of the first heat exchange medium in the heat exchange channel 140, or even does not flow. However, since the thermal conductivity of the first heat exchange medium such as low-temperature air itself is very low, for example, the thermal conductivity of air at room temperature (20°C) is only 0.027W / (m·K), which is much lower than the thermal conductivity of glass of 0.7-1.3W / (m·K). Therefore, the first heat exchange medium between the outer baffle 120 and the inner baffle 130 itself is a material with good thermal insulation performance, and thus can effectively block the heat obtained from the second heat exchange medium outside the heat exchange tube 10 from being transferred inward, thereby better protecting the inner baffle 130. When a leak is detected in the heat exchange tube 10, a seal 150 of a corresponding size can be filled between the outer baffle 120 and the inner baffle 130 by pulling or pushing, so that the heat exchange tube 10 can be repaired in a quick and easy manner.

[0065] In the embodiment of the present invention, the interval between the outer baffle 120 and the inner baffle 130 may be greater than or equal to 1 mm, preferably greater than or equal to 2 mm, and more preferably greater than or equal to 3 mm, so that the seal 150 is disposed between the outer baffle 120 and the inner baffle 130. When the first heat exchange medium flows between the outer baffle 120 and the inner baffle 130, the inner baffle 130 and the outer baffle 120 are cooled by flow heat exchange, and the inner baffle 130 can be effectively protected. In addition, by setting the interval between the outer baffle 120 and the inner baffle 130 in the above manner, it is easier to fill the seal 150 between the outer baffle 120 and the inner baffle 130 when leakage of the heat exchange tube 10 is detected.

[0066] In an embodiment of the present invention, the outer baffle 120 and the inner baffle 130 can be separated from at least one of the first panel 111 and the second panel 112 and connected together by an adhesive 160. The outer baffle and the inner baffle are connected together with at least one of the first panel and the second panel by an adhesive, which can avoid the serious stress concentration problem caused by the integral molding of the traditional heat exchange tube through processes such as drawing, so that the heat exchange tube made by bonding is impact-resistant and shock-resistant, and avoids the complex processes of melting, drawing, shaping, cutting and grinding when manufacturing traditional glass tubes. Since the fire-resistant temperature of the adhesive is low, when the second heat exchange medium outside the heat exchange tube is overheated, the adhesive may oxidize and fall off, and the overall sealing of the flat glass tube cannot be guaranteed, resulting in leakage of the heat exchange medium between the inside and outside of the heat exchange tube.

[0067] According to the embodiment of the present invention, by providing the seal 150 between the outer baffle 120 and the inner baffle 130, the resistance of the first heat exchange medium leaking to the outside of the heat exchange tube 10 or the resistance of the second heat exchange medium leaking to the inside of the heat exchange tube 10 can be increased, and the leakage amount of the first heat exchange medium or the second heat exchange medium can be reduced. This can not only prevent the oxygen content of the second heat exchange medium outside the heat exchange tube 10 from increasing, but also prevent the heat exchange efficiency and energy recovery rate of the heat exchange tube 10 from decreasing.

[0068] In an embodiment of the present invention, the width of the outer baffle 120 may be smaller than the width of the inner baffle 130. In the heat exchange tube 10, the outer baffle 120 is located outside the inner baffle 130, and is closer to or exposed to the second heat exchange medium outside the heat exchange tube 10 than the inner baffle 130. Burnout and leakage caused by overheating generally first occur between the outer baffle 120 and the first and second panels 111 and 112 (the adhesive 160). The outer baffle 120 acts as a buffer baffle or a sacrificial baffle, and thus the width may be smaller, for example, set to be smaller than the width of the inner baffle 130.

[0069] In the embodiment of the present invention, the ratio of the sum of the width of the outer baffle plate 120, the width of the inner baffle plate 130, and the distance between the outer baffle plate 120 and the inner baffle plate 130 to the width of the first panel 111 and the second panel 112 may be less than or equal to 1:5, preferably less than or equal to 1:10. The outer baffle plate 120, the inner baffle plate 130, and the seal 150 disposed therebetween may be regarded as a baffle as a whole. By setting the widths of the three in the above manner, a larger heat exchange area can be ensured without leakage of the heat exchange medium.

[0070] Combined with the following Figure 2 , Figure 3a , Figure 3b , Figure 3c and Figure 4, describe other embodiments of the heat exchange tube according to the present invention. It should be noted that the above Figure 1 The description of the heat exchange tube 10 of the first embodiment is also applicable to the heat exchange tubes of the following embodiments.

[0071] Figure 2 is a cross-sectional view of a second embodiment of a heat exchange tube according to the present invention.

[0072] and Figure 1 The first embodiment differs in that, in Figure 2 In the second embodiment, the inner baffles of the heat exchange tube 20 may include a first inner baffle 131 and a second inner baffle 132 , and the outer baffles of the heat exchange tube 20 may include a first outer baffle 121 and a second outer baffle 122 .

[0073] like Figure 2 As shown, the heat exchange tube 20 includes a first outer baffle 121 and a first inner baffle 131 disposed on a first side of the first panel 111 and the second panel 112, and a second outer baffle 122 and a second inner baffle 132 disposed on a second side opposite to the first side. Specifically, the first inner baffle 131 may be disposed between the first outer baffle 121 and the second inner baffle 132, and the second inner baffle 132 may be disposed between the first inner baffle 131 and the second outer baffle 122. The first inner baffle 131, the second inner baffle 132, the first panel 111 and the second panel 112 enclose a heat exchange flow channel 140. The first seal 151 may be disposed between the first outer baffle 121 and the first inner baffle 131 and the first panel 111 and the second panel 112. The second seal 152 may be disposed between the second outer baffle 122 and the second inner baffle 132 and the first panel 111 and the second panel 112.

[0074] In this embodiment, the first panel 111, the second panel 112, the first inner baffle plate 131, the second inner baffle plate 132, the first outer baffle plate 121 and the second outer baffle plate 122 can all be independent components, and the first panel 111 and the second panel 112 can both be sealed and connected with the first inner baffle plate 131, the second inner baffle plate 132, the first outer baffle plate 121 and the second outer baffle plate 122 by the adhesive 160.

[0075] In this embodiment, the spacing between the first outer baffle 121 and the first inner baffle 131 is greater than the spacing between the second outer baffle 122 and the second inner baffle 132. Accordingly, the width of the first seal 151 can be greater than the width of the second seal 152. In the air-to-air heat exchange tube, the flow directions of the first heat exchange medium inside the heat exchange tube and the second heat exchange medium outside the heat exchange tube can be orthogonal to each other to improve the heat exchange efficiency. In this embodiment, when the overall flow direction of the second heat exchange medium outside the heat exchange tube 20 is from the first outer baffle 121 to the second outer baffle 122 (for example, Figure 2 The first seal 151 is located on the smoke-facing side of the heat exchange tube 20, and the second seal 152 is located on the smoke-receiving side of the heat exchange tube 20. The first seal 151 on the smoke-facing side has a greater width than the second seal 152 on the smoke-receiving side, thereby providing a stronger temperature resistance and cooling effect for the adhesive 160 between the first outer baffle 121 and the first and second panels 111 and 112, thereby preventing the adhesive 160 of the first outer baffle 121 on the smoke-facing side from burning out when over-temperature occurs.

[0076] Similar to the previous embodiment, in another embodiment, the thermal conductivity of the first seal 151 disposed between the first outer baffle 121 and the first inner baffle 131 may be smaller than the thermal conductivity of the second seal 152 disposed between the second outer baffle 122 and the second inner baffle 132. For example, when the first seal 151 and the second seal 152 are the same size, by making the first seal 151 on the flue gas side have a lower thermal conductivity, a stronger temperature resistance and a cooling effect can be provided on the flue gas side of the heat exchange tube 20.

[0077] Figure 3a is a cross-sectional view of a third embodiment of a heat exchange tube according to the present invention, Figure 3b is a perspective view of a third embodiment of a heat exchange tube according to the present invention, and Figure 3c FIG. 4 is a top view of a heat exchange tube according to a third embodiment of the present invention.

[0078] and Figure 2 The second embodiment differs in that, in Figure 3a , Figure 3b and Figure 3c In the third embodiment, the heat exchange tube 30 further includes an intermediate baffle 170. For example, N intermediate baffles 170 may be provided in the internal pipeline of the heat exchange tube 30 to divide the internal pipeline of the heat exchange tube 30 into N+1 independent heat exchange channels 140 sealed from each other, where N is an integer greater than or equal to 1. Figure 3a , Figure 3b and Figure 3cAs shown, an intermediate baffle 170 may be provided at least in the middle of the width direction (Y direction) of the cross section of the inner pipe of the heat exchange tube 30. The intermediate baffle 170 may be, for example, in a strip shape. The intermediate baffle 170 may, for example, penetrate the heat exchange tube 30 along the extension direction (X direction) of the heat exchange flow channel of the heat exchange tube 30. For example, the intermediate baffle 170 may be provided in parallel with the first outer baffle 121, the second outer baffle 122, the first inner baffle 131, and the second inner baffle 132.

[0079] In an embodiment of the present invention, the middle baffle 170 may be sealed and connected to at least one of the first panel 111 and the second panel 112 through the adhesive 160. For example, the middle baffle 170 may be sealed and connected to both the first panel 111 and the second panel 112 through the adhesive 160.

[0080] In this embodiment, if Figure 3a , Figure 3b and Figure 3c As shown, the heat exchange tube 30 may be optionally provided with a first blocking member 181 and a second blocking member 182. The first blocking member 181 and the second blocking member 182 may be provided on both sides of the heat exchange tube 30 opposite to each other, for example, on both sides of the heat exchange tube 30 along the Y direction. Figure 3b As shown, the first blocking member 181 and the second blocking member 182 extend along the extension direction of the heat exchange channel 140 of the heat exchange tube 30 , for example, along the X direction.

[0081] In this embodiment, the first blocking member 181 and the second blocking member 182 may include a supporting portion and a side blocking portion, the supporting portion includes two supporting surfaces parallel to each other for supporting the first panel 111 and the second panel 112, and the side blocking portion extends perpendicular to the supporting surfaces of the supporting portion, so that the first blocking member 181 and the second blocking member 182 have a T-shaped cross-sectional shape.

[0082] In this embodiment, the first blocking member 181 and the second blocking member 182 can be respectively connected to the first panel 111 and the second panel 112 by adhesive 160, and the first blocking member 181 and the second blocking member 182 can be made of metal aluminum. The first blocking member 181 and the second blocking member 182 made of metal aluminum are easy to process and manufacture.

[0083] Although the first blocking member 181 and the second blocking member 182 are described as internal components of the heat exchange tube 30 in this embodiment, it should be understood that the first blocking member 181 and the second blocking member 182 may also be components independent of the heat exchange tube 30. When the heat exchange tube 30 is used to assemble to form a heat exchanger, the mounting plate for mounting the heat exchange tube 30 generally has a through hole that allows the heat exchange tube 30 to pass through and fix one end of the heat exchange tube 30. The outer shape formed by the first panel 111, the second panel 112, the first blocking member 181 and the second blocking member 182 is consistent with the shape of the through hole of the mounting plate, thereby sealing the through hole.

[0084] Figure 4 is a cross-sectional view of a fourth embodiment of a heat exchange tube according to the present invention.

[0085] and Figure 3a , Figure 3b and Figure 3c The third embodiment is different in that, in Figure 4 In the fourth embodiment, the heat exchange tube 40 further includes at least one reinforcing rib 190. The reinforcing rib 190 may be disposed in the heat exchange channel 140. In some examples, at least one of the reinforcing ribs 190 may be a strip structure, and the strip structure may, for example, extend along the extension direction of the heat exchange channel 140 of the heat exchange tube 40, and may be disposed in parallel with the outer baffle and / or the inner baffle. In other examples, the strip structure may be arranged in an S-shape or a Z-shape in the heat exchange tube 40. In still other examples, at least one of the reinforcing ribs 190 may also be a cylindrical structure, which is dispersedly arranged in the heat exchange channel 140 of the heat exchange tube 40. For example, the cylindrical structure may support the first panel 111 and the second panel 112 of the heat exchange tube 40 in a column manner at multiple positions.

[0086] In an embodiment of the present invention, the reinforcing rib 190 may be connected to at least one of the first panel 111 and the second panel 112 by means of an adhesive 160. The reinforcing rib 190 has the effects of supporting the first panel 111 and the second panel 112, enhancing the disturbance of the heat exchange medium, and strengthening the heat transfer, and at the same time, may also improve the strength of the heat exchange tube 40 and improve the pressure bearing capacity.

[0087] In the above-described embodiments, the heat exchange tubes 10, 20, 30, 40 according to the present invention are gas-to-gas heat exchange tubes, such as heat exchange tubes used for heat exchange and energy recovery between low-temperature air and high-temperature flue gas. However, it should be understood that the heat exchange tubes of the present invention are not limited thereto, the heat exchange medium inside the heat exchange tubes is not limited to air, but can be any gas used for heat exchange, and the heat exchange medium outside the heat exchange tubes is not limited to flue gas, but can be any gas used for heat exchange.

[0088] Figure 5 Schematic diagram of the structure of the heat exchanger according to the present invention.

[0089] like Figure 5 As shown, according to an embodiment of the present invention, the heat exchanger 1 may include a shell 2 and a plurality of heat exchange tubes 3. The shell 2 may, for example, be roughly in the shape of a box. The shell 2 may include two mounting plates 4 arranged opposite to each other in the X direction. A plurality of first through holes (not shown) are formed on each mounting plate 4. The shell 2 is formed with second through holes (not shown) on two oppositely arranged side surfaces perpendicular to the mounting plate 4 (i.e., two side surfaces of the shell 2 in the Y direction). Both ends of each heat exchange tube 3 are respectively sealed and connected to the corresponding first through holes on the mounting plate 4, thereby providing a flow channel for a first heat exchange medium such as low-temperature air. At least one of the plurality of heat exchange tubes 3 may be the heat exchange tubes 10, 20, 30, 40 described in the above-mentioned embodiments.

[0090] like Figure 5 As shown, the first heat exchange medium, such as low-temperature air, can be from one side in the X direction (eg Figure 5 The first heat exchange medium, such as low-temperature air, exchanges heat with the second heat exchange medium, such as high-temperature flue gas, outside the heat exchange tube 3 while flowing through the heat exchange tube 3, and then passes through the other side (such as Figure 5 The second heat exchange medium outside the heat exchange tube 3 can flow out from one side of the shell 2 (for example, the right side in the figure) along the -Y direction. Figure 5 The heat exchange medium flows through the space between the heat exchange tube 3 and the shell 2, exchanges heat with the first heat exchange medium in the heat exchange tube 3, and then flows out from the other side of the shell 2 (for example, Figure 5 The electric current flows out through a second through hole on the rear side of the tube.

[0091] In an embodiment of the present invention, the heat exchanger 1 is an air preheater.

[0092] Figure 6 is a schematic flow chart of a method for manufacturing a heat exchange tube according to the present invention.

[0093] like Figure 6 As shown, and combined Figure 1 A method for manufacturing a heat exchange tube 10 may include the following steps:

[0094] Providing a first panel 111 and a second panel 112 disposed opposite to each other;

[0095] Providing an outer baffle 120 and an inner baffle 130 disposed between the first panel 111 and the second panel 112, the outer baffle 120 is disposed outside the inner baffle 130, and the inner baffle 130 is enclosed with the first panel 111 and the second panel 112 on a side opposite to the outer baffle 120 to form a heat exchange flow channel 140; and

[0096] A seal 150 is disposed between the outer baffle plate 120 and the inner baffle plate 130 to prevent the medium from being transferred between the inner baffle plate 130 and the outer baffle plate 120 .

[0097] It should be noted that the manufacturing method of the heat exchange tube 10 according to the present invention is not limited to the above. For example, after the outer baffle 120 and the inner baffle 130 are fixed to the first panel 111 (or the second panel 112), the seal 150 can be set in the groove formed by the outer baffle 120, the inner baffle 130 and the first panel 111, and then the second panel 112 is placed opposite to and fixed to the first panel 111, thereby forming, for example Figure 1 The heat exchange tube 10 is shown.

[0098] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A heat exchange tube, comprising: a first panel and a second panel disposed opposite to each other; and an outer baffle and an inner baffle disposed between the first panel and the second panel, Among them, the outer baffle is arranged on the outer side of the inner baffle, and the inner baffle is enclosed with the first panel and the second panel on the side opposite to the outer baffle to form a heat exchange flow channel, the outer baffle and the inner baffle are separated from at least one of the first panel and the second panel and are connected together by an adhesive, and the heat exchange tube also includes a seal arranged between the outer baffle and the inner baffle, which is used to block the transfer of the medium between the outer baffle and the inner baffle.

2. The heat exchange tube according to claim 1, wherein: The seal comprises a solid formed sealing material.

3. The heat exchange tube according to claim 2, wherein: The sealing element is a packing formed by weaving flexible wires.

4. The heat exchange tube according to claim 1, wherein: The sealing element is formed by curing liquid sealant.

5. The heat exchange tube according to any one of claims 1 to 4, wherein: The ratio of the thermal conductivity of the seal to the thermal conductivity of any one of the outer baffle and the inner baffle is less than or equal to 1:

2.

6. The heat exchange tube according to claim 5, wherein: The ratio of the thermal conductivity of the seal to the thermal conductivity of any one of the outer baffle and the inner baffle is less than or equal to 1:

5.

7. The heat exchange tube according to claim 6, wherein: The ratio of the thermal conductivity of the seal to the thermal conductivity of any one of the outer baffle and the inner baffle is less than or equal to 1:

10.

8. The heat exchange tube according to claim 5, wherein: The first panel, the second panel, the outer baffle and the inner baffle are made of at least one of glass, ceramic, graphite and silicon carbide.

9. The heat exchange tube according to claim 2 or 3, wherein: The sealing member includes an inorganic sealing material.

10. The heat exchange tube according to claim 9, wherein: The sealing element comprises asbestos or ceramic fiber.

11. The heat exchange tube according to claim 1, wherein: The sealing member includes an organic sealing material.

12. The heat exchange tube according to claim 1, wherein: The sealing element comprises polytetrafluoroethylene, polyimide or silicone rubber.

13. The heat exchange tube according to claim 1, wherein: The ratio of the interval between the outer baffle plate and the inner baffle plate to the width of the heat exchange flow channel is less than or equal to 1:

10.

14. The heat exchange tube according to claim 13, wherein: The ratio of the interval between the outer baffle plate and the inner baffle plate to the width of the heat exchange flow channel is 1:30 to 1:

20.

15. The heat exchange tube according to claim 13, wherein: The interval between the outer baffle plate and the inner baffle plate is less than or equal to 10 mm.

16. The heat exchange tube according to claim 15, wherein: The interval between the outer baffle plate and the inner baffle plate is less than or equal to 8 mm.

17. The heat exchange tube according to claim 16, wherein: The interval between the outer baffle plate and the inner baffle plate is less than or equal to 5 mm.

18. The heat exchange tube according to claim 15, wherein: The interval between the outer baffle plate and the inner baffle plate is greater than or equal to 1 mm so that the seal is disposed between the outer baffle plate and the inner baffle plate.

19. The heat exchange tube according to claim 18, wherein: The interval between the outer baffle plate and the inner baffle plate is greater than or equal to 2 mm.

20. The heat exchange tube according to claim 19, wherein: The interval between the outer baffle plate and the inner baffle plate is greater than or equal to 3 mm.

21. The heat exchange tube according to claim 1, wherein: The width of the outer baffle is smaller than the width of the inner baffle.

22. The heat exchange tube according to claim 1, wherein: The ratio of the sum of the width of the outer baffle, the width of the inner baffle, and the distance between the outer baffle and the inner baffle to the width of the first panel and the second panel is less than or equal to 1:

5.

23. The heat exchange tube according to claim 22, wherein: The ratio of the sum of the width of the outer baffle, the width of the inner baffle, and the distance between the outer baffle and the inner baffle to the width of the first panel and the second panel is less than or equal to 1:

10.

24. The heat exchange tube according to claim 1, wherein: The outer baffle and the inner baffle are arranged on the first side of the first panel and the second panel, and the heat exchange tube also includes a single opposite side baffle arranged on the second side opposite to the first side, which is used to enclose the first panel and the second panel to form a heat exchange flow channel.

25. The heat exchange tube according to claim 1, wherein: The inner baffle includes a first inner baffle and a second inner baffle, the outer baffle includes a first outer baffle and a second outer baffle, the first inner baffle is disposed between the first outer baffle and the second inner baffle, and the second inner baffle is disposed between the first inner baffle and the second outer baffle.

26. The heat exchange tube according to claim 25, wherein: The distance between the first outer baffle plate and the first inner baffle plate is greater than the distance between the second outer baffle plate and the second inner baffle plate.

27. The heat exchange tube according to claim 26, wherein: A thermal conductivity of a seal disposed between the first outer baffle plate and the first inner baffle plate is smaller than a thermal conductivity of a seal disposed between the second outer baffle plate and the second inner baffle plate.

28. The heat exchange tube according to claim 1, wherein: The heat exchange tube is an air-to-air heat exchange tube.

29. A heat exchanger comprising: A housing, the housing comprising two mounting plates arranged opposite to each other, the mounting plates respectively having a plurality of first through holes formed thereon, and the housing having second through holes formed on two oppositely arranged side surfaces perpendicular to the mounting plates; and A plurality of heat exchange tubes, both ends of each heat exchange tube are respectively sealed and connected to the corresponding first through holes of the mounting plate, Wherein, at least one of the plurality of heat exchange tubes is a heat exchange tube according to any one of claims 1-28.

30. The heat exchanger according to claim 29, wherein: The heat exchanger is an air preheater.

31. A method for manufacturing a heat exchange tube, comprising: providing a first panel and a second panel disposed opposite to each other; Providing an outer baffle and an inner baffle disposed between the first panel and the second panel, wherein the outer baffle is disposed outside the inner baffle, and the inner baffle is formed to enclose the first panel and the second panel on a side opposite to the outer baffle to form a heat exchange flow channel; and A sealing member is provided between the outer baffle plate and the inner baffle plate to prevent the medium from being transferred between the inner baffle plate and the outer baffle plate.

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