CN216308704U - Heat exchange tube and heat exchanger - Google Patents

Abstract

The utility model provides a heat exchange tube and a heat exchanger. The heat exchange tube includes: a first panel and a second panel disposed opposite to each other; and an outside barrier and an inside barrier disposed between the first panel and the second panel. The outer side baffle is arranged on the outer side of the inner side baffle, the first panel and the second panel surround to form a heat exchange flow channel on the side opposite to the outer side baffle, and the heat exchange tube further comprises a sealing element arranged between the outer side baffle and the inner side baffle and used for blocking medium transmission between the outer side baffle and the inner side baffle. According to the heat exchange tube and the heat exchanger, the sealing element is arranged between the outer side baffle and the inner side baffle to block the medium transmission between the outer side baffle and the inner side baffle, so that the leakage resistance when the heat exchange medium leaks is increased, the leakage amount is reduced, and the heat exchange efficiency is improved.

Description

Heat exchange tube and heat exchanger

Technical Field

The present invention relates to heat exchange devices in the field of heat transfer technology, and in particular to a heat exchange tube with improved leakage prevention capability and a heat exchanger comprising the same.

Background

The glass tube has excellent corrosion resistance, and particularly, the round glass tube is used as a heat exchange tube of a heat exchange device due to the advantages of mature manufacturing process and low cost. However, the circular glass tube has the defects of low heat exchange efficiency and insufficient structural compactness. The flat glass tube can overcome the disadvantages of the circular glass tube, but the yield is very low when the length and width of the cross section is large due to the drawing process limitation, and the larger the length and width ratio is, the more severe the stress concentration of the drawn flat glass tube is, and the higher the failure rate when used as a heat exchange tube is, based on the characteristics of glass.

The plate-tube heat exchanger which appears in recent years has the advantages of high heat exchange efficiency, compact structure, convenient maintenance, low leakage rate of heat exchange media and the like. However, components inside the heat exchange tube may be deformed or damaged in a high-temperature working environment or when the working temperature changes, which may cause failure of the heat exchange tube, leakage of a heat exchange medium, reduction of heat exchange efficiency, and reduction of energy recovery rate.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to at least partially overcome the above-mentioned deficiencies by providing a heat exchange tube, a heat exchanger and a method of manufacturing a heat exchange tube.

According to an aspect of the present invention, there is provided a heat exchange pipe comprising: a first panel and a second panel disposed opposite to each other; and an outside baffle and an inside baffle arranged between the first panel and the second panel, wherein the outside baffle is arranged outside the inside baffle, the inside baffle surrounds the first panel and the second panel at the side opposite to the outside baffle to form a heat exchange channel, and the heat exchange tube further comprises a sealing member arranged between the outside baffle and the inside baffle and used for blocking the medium transmission between the outside baffle and the inside baffle.

In an exemplary embodiment, the seal comprises a solid molded sealing material.

In an exemplary embodiment, the seal is a packing formed from a flexible wire braid.

In an exemplary embodiment, the seal is formed by curing a liquid sealant.

In an exemplary embodiment, a ratio of a thermal conductivity of the seal to a thermal conductivity of either of the outboard and inboard baffles 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.

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

In an exemplary embodiment, the seal comprises an inorganic sealing material, preferably comprising asbestos or ceramic fibers.

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

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

In an exemplary embodiment, the spacing between the outboard and inboard baffles is less than or equal to 10mm, preferably less than or equal to 8mm, and more preferably less than or equal to 5 mm.

In an exemplary embodiment, the spacing between the outboard and inboard flaps is greater than or equal to 1mm, preferably greater than or equal to 2mm, and more preferably greater than or equal to 3mm, such that the seal is disposed between the outboard and inboard flaps.

In an exemplary embodiment, the outer and inner fenders are separate from at least one of the first and second panels and are joined together by an adhesive.

In an exemplary embodiment, the width of the outboard flap is less than the width of the inboard flap.

In an exemplary embodiment, a ratio of a sum of the width of the outside barrier, the width of the inside barrier, and the distance between the outside barrier and the inside barrier 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.

In an exemplary embodiment, the outboard and inboard baffles are disposed on a first side of the first and second panels, and the heat exchange tube further includes a single, opposite side baffle disposed on a second side opposite the first side for forming a heat exchange path about the first and second panels.

In an exemplary embodiment, the inboard baffles comprise a first inboard baffle and a second inboard baffle, the outboard baffles comprise a first outboard baffle and a second outboard baffle, the first inboard baffle is disposed between the first outboard baffle and the second inboard baffle, and the second inboard baffle is disposed between the first inboard baffle and the second outboard baffle.

In an exemplary embodiment, a spacing between the first outboard baffle and the first inboard baffle is greater than a spacing between the second outboard baffle and the second inboard baffle.

In an exemplary embodiment, a thermal conductivity of a seal disposed between the first outboard baffle and the first inboard baffle is less than a thermal conductivity of a seal disposed between the second outboard baffle and the second inboard baffle.

In an exemplary embodiment, the heat exchange tubes are gas-to-gas heat exchange tubes.

According to another aspect of the present invention, there is provided a heat exchanger comprising: the shell comprises two opposite mounting plates, a plurality of first through holes are formed in the mounting plates respectively, and second through holes are formed in two opposite side surfaces perpendicular to the mounting plates; and a plurality of heat exchange tubes, both ends of each heat exchange tube being hermetically connected to the corresponding first through holes of the mounting plate, respectively, wherein at least one of the plurality of heat exchange tubes is any one of the heat exchange tubes as described above.

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

According to still another aspect of the present invention, there is provided a method of manufacturing a heat exchange tube, comprising: providing a first panel and a second panel disposed opposite each other; providing an outside baffle and an inside baffle which are arranged between the first panel and the second panel, arranging the outside baffle outside the inside baffle, and enabling the inside baffle to surround the first panel and the second panel on the opposite side of the outside baffle to form a heat exchanging channel; and a sealing element is arranged between the outer side baffle and the inner side baffle and is used for blocking the medium transmission between the inner side baffle and the outer side baffle.

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

according to the heat exchange tube and the heat exchanger, the sealing element is arranged between the outer side baffle and the inner side baffle to block the medium transmission between the outer side baffle and the inner side baffle, so that the leakage resistance when the heat exchange medium leaks is increased, the leakage amount is reduced, and the heat exchange efficiency is improved.

Drawings

Other features, objects and advantages of the utility model will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 is a cross-sectional view of a first embodiment of a heat exchange tube according to the present invention;

FIG. 2 is a cross-sectional view of a second embodiment of a heat exchange tube according to the present invention;

FIG. 3a is a cross-sectional view of a third embodiment of a heat exchange tube according to the present invention;

FIG. 3b is a perspective view of a third embodiment of a heat exchange tube according to the present invention;

FIG. 3c is a top view of a third embodiment of a heat exchange tube according to the present invention;

FIG. 4 is a cross-sectional view of a fourth embodiment of a heat exchange tube according to the present invention;

FIG. 5 is a schematic diagram of a heat exchanger according to the present invention; and is

Fig. 6 is a schematic flow chart of a method of manufacturing a heat exchange tube according to the present invention.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the utility model. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

In the present invention, the terms "upper", "lower", "inner", "outer", "center", "longitudinal", "lateral", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the utility model and its embodiments and are not intended to limit the indicated devices, components or elements to a particular orientation or to be constructed and operated in a particular orientation.

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

Referring to fig. 1, a heat exchange tube 10 according to a first embodiment of the heat exchange tube of the present invention comprises first and second panels 111 and 112 disposed opposite to each other, and an outer baffle 120 and an inner baffle 130 disposed between the first and second panels 111 and 112. The outside barrier 120 is disposed outside the inside barrier 130. The inside baffle 130 encloses the first and second panels 111 and 112 on the side opposite the outside baffle 120 to form a heat exchange flow channel 140. The heat exchange tube 10 further includes a sealing member 150. The seal 150 is disposed between the outside barrier 120 and the inside barrier 130 and serves to block the transfer of media between the outside barrier 120 and the inside barrier 130.

As shown in fig. 1, the heat exchange tube 10 may include two panels, for example, a first panel 111 and a second panel 112 shown in fig. 1. 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 may be formed by splicing two or more smaller panels.

In some embodiments, one of the first panel 111 and the second panel 112 may have an L-shape or a U-shape in cross section with two arms of different lengths, and the other has a flat plate shape, and the two panels are joined to form a U-shape in cross section with two arms of equal length. In other embodiments, the heat exchange tube 10 may comprise a single panel bent in a U-shape. In these embodiments, the outer baffle 120 and the inner baffle 130 are disposed on the open side of the U-shaped cross-section, and the inner baffle 130 and the first panel 111 and the second panel 112 (or a single panel) may enclose a heat exchange flow channel 140. The seal 150 is between the outside baffle 120, the inside baffle 130, and the first and second panels 111 and 112 (or a single panel) and serves to block the transfer of media between the outside baffle 120 and the inside baffle 130.

As shown in fig. 1, the outside baffles 120 and the inside baffles 130 are disposed on a first side (e.g., the right side in fig. 1) of the first and second panels 111 and 112, and the heat exchange tube 10 may further include a single opposite-side baffle 120'. The opposite-side baffle 120' is disposed at a second side (e.g., the left side in fig. 1) opposite to the first side, and encloses the first and second panels 111 and 112 to form a heat exchange flow channel 140.

As shown in fig. 1, the inside barrier 130, the opposite side barrier 120', the first panel 111, and the second panel 112 may enclose a heat exchange flow channel 140, and a seal 150 may be disposed between the outside barrier 120, the inside barrier 130, the first panel 111, and the second panel 112. In this case, the heat exchange tube 10 includes only one heat exchange flow channel 140 and one sealing member 150.

As shown in fig. 1, the first panel 111 and the second panel 112 may be disposed opposite to each other. For example, the first panel 111 and the second panel 112 may be arranged parallel to each other, but other arrangements are possible as long as the two panels are spaced apart from each other by a certain distance.

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 possible, 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, although they may have different shapes and/or sizes.

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

In an embodiment of the present invention, at least one of the first panel 111 and the second panel 112 may be made of one of non-metallic materials such as glass, ceramic, graphite, silicon carbide, and the like. Non-metallic materials such as glass, ceramics, graphite, silicon carbide and the like have good heat-conducting property and corrosion resistance. In some examples, the first panel 111 and the second panel 112 may each be made of any one of glass, ceramic, graphite, and silicon carbide. In other examples, one of the first and second panels 111 and 112 may be made of any one of glass, ceramic, graphite, and silicon carbide (e.g., glass), and the other may be made of another one of these materials (e.g., ceramic), as long as the heat transfer requirements are met.

In an embodiment, at least one of the outer baffle 120 and the inner baffle 130 may be made of one of glass, ceramic, graphite, and silicon carbide, for example. In some examples, the outer baffle 120 and the inner baffle 130 may each be made of any one of glass, ceramic, graphite, and silicon carbide. In other examples, one of the outer baffle 120 and the inner baffle 130 may be made of any one of glass, ceramic, graphite, and silicon carbide (e.g., glass), while the other may be made of another one of these materials (e.g., ceramic), as long as the heat transfer requirements are met.

In an embodiment of the present invention, the sealing member 150 may be disposed between the first panel 111, the second panel 112, the outside barrier 120, and the inside barrier 130, and functions as a seal.

When the heat exchange tube 10 is in operation, a first heat exchange medium (e.g., low-temperature air) flows inside the heat exchange tube 10 (inside the heat exchange flow channel 140), a second heat exchange medium (e.g., high-temperature flue gas) flows outside the heat exchange tube 10, and heat exchange is performed between the first heat exchange medium and the second heat exchange medium through the heat exchange tube 10. In high temperature working environments, the components may be deformed, ablated, or damaged, and gaps may occur at the sealed joints between the outer baffle 120 and the first and second panels 111 and 112. Due to the occurrence 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 sealing member 150, the first heat exchange medium inside the heat exchange tube 10 needs to pass through the sealed joints between the inside barrier 130 and the first and second panels 111 and 112 and the gaps between the sealing member 150 and the first and second panels 111 and 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 gaps between the sealing member 150 and the first and second panels 111 and 112 and the sealed joints between the inside baffles 130 and the first and second panels 111 and 112 to reach the inside of the heat exchange tube 10.

By providing the sealing member 150 between the outer baffle 120 and the inner baffle 130, it is possible to increase the resistance against the leakage of the first heat exchange medium to the outside of the heat exchange tube 10 or the resistance against the leakage of the second heat exchange medium to the inside of the heat exchange tube 10, and to reduce the leakage amount of the first heat exchange medium or the second heat exchange medium.

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 occurs at the sealed joint between the outside barrier 120 and the first and second panels 111 and 112, low-temperature air may leak from the inside to the outside of the heat exchange tube 10. In this case, the sealing member 150 can increase the resistance of the low temperature air from the inside to the outside of the heat exchange pipe 10, and can reduce the leakage amount of the low temperature air. This can prevent not only the oxygen content of the second heat exchange medium outside the heat exchange tube 10 from rising but also the heat exchange efficiency and the energy recovery rate of the heat exchange tube 10 from falling.

In an embodiment of the present invention, the seal 150 may comprise a solid molded sealing material. If the sealing member 150 is a solid molded sealing material, when a gap occurs between the outer baffle 120 and the first and second panels 111 and 112 to cause leakage, the gap between the outer baffle 120 and the inner baffle 130 can be individually sealed off by the sealing member 150, thereby preventing leakage of the heat exchange medium and reducing the amount of leakage. In addition, when the sealing member 150 is a solid molding sealing material, the respective sealing members 150 can be individually replaced as needed. It can be seen that, by using the sealing member 150 of the sealing material formed in a solid state, when the leakage of the heat exchange tube 10 is detected, the corresponding heat exchange tube 10 can be repaired using the sealing member 150, which significantly reduces the repair time and maintenance cost.

In an embodiment of the present invention, the seal 150 may be a packing formed from a flexible wire braid. For example, the seal 150 may be a packing having a strip or rope shape formed by weaving a relatively soft wire, and generally has a square, rectangular, or circular cross-sectional shape. In this case, the sealing member 150 may have flexibility and be in a strip or rope shape. When the leakage of the heat exchange tube 10 is detected, the sealing member 150 may be filled between the outside barrier 120 and the inside barrier 130 by pulling or pushing, so that the heat exchange tube 10 is 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 easily withdrawn from or replaced with the heat exchange tube 10. In addition, the flexible seal 150 prevents damage to the face plate or baffle of the heat exchange tube 10 or loss of sealing performance during plugging or replacement.

In embodiments of the present invention, the sealing member 150 may be formed by curing a liquid sealant. For example, in the manufacturing process of the heat exchange tube of the present invention, after the outside barrier 120 and the inside barrier 130 are disposed on the first panel 111, a liquid sealant is applied by injection, coating, or the like, into the grooves formed by the outside barrier 120, the inside barrier 130, and the first panel 111. The sealant applied in the groove is cured by evaporation, heating, light application, and the like. Then, the second panel 112 is opposed to and fixed to the first panel 111, thereby forming the heat exchange tube 10 shown in fig. 1, for example.

In the above embodiments, the sealing member 150 according to an embodiment of the present invention is described by taking a solid molded sealing material and a cured liquid sealant as an example. However, the seal 150 of the present invention is not limited thereto but may be any type of sealing material that can be stably disposed between the outside barrier 120 and the inside barrier 130 to increase the leakage resistance of the heat exchange medium when the heat exchange tube 10 is operated.

In an embodiment of the present invention, the seal 150 also serves to increase thermal resistance between the first panel 111, the second panel 112, the outside barrier 120, and the inside barrier 130. In this case, the seal 150 can effectively reduce or block the heat transfer from the outside barrier 120 to the inside barrier 130 caused by the second heat exchange medium such as high temperature flue gas. Therefore, the deformation or damage of the internal components of the heat exchange tube caused by high temperature or temperature change can be prevented, so that the temperature resistance of the heat exchange tube is improved, the service life is prolonged, the failure rate is reduced, and the heat exchange efficiency is improved.

In an embodiment of the present invention, the ratio of the thermal conductivity of the seal 150 to the thermal conductivity of either of the outside barrier 120 and the inside barrier 130 may be less than or equal to 1:2, may be less than or equal to 1:5, and may be less than or equal to 1: 10. The seal 150 may be made of any temperature and corrosion resistant material. The seal 150 preferably has a low thermal conductivity. For example, the thermal conductivity of these materials is much lower than that of glass itself, e.g., polytetrafluoroethylene has a thermal conductivity of 0.27W/(m.K), silicone rubber typically has a thermal conductivity of 0.27W/(m.K) or less, and ceramic fibers have a thermal conductivity of 0.03W/(m.K), as compared to glass of 0.7-1.3W/(m.K). Under otherwise identical conditions, such as equal flue gas temperature and flow rate and equal outside baffle temperature, the amount of heat transferred to the inside baffle via the ptfe packing via the outside baffle is only 1/3 or less of glass. This can greatly reduce the temperature of the outer wall of the inside fender, thereby reducing the temperature of the inside fender and prolonging the service life.

In an embodiment of the present invention, the seal 150 may comprise an inorganic sealing material, which may preferably comprise asbestos or ceramic fibers. For example, the seal 150 may include an asbestos packing or a ceramic fiber packing.

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.

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 flow channel, the height may be defined as the vertical dimension in a cross-section perpendicular to the extension direction of the heat exchange flow channel, and the thickness may be defined as the dimension in the extension direction of the heat exchange flow channel. For example, in connection with fig. 1, width may refer to a dimension in the Y-direction, height may refer to a dimension in the Z-direction, and thickness may refer to a dimension in the X-direction.

In the 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 flow channel 140 may be less than or equal to 1:10, and preferably may be 1:30 to 1: 20. The spacing between the outer baffle 120 and the inner baffle 130 may be less than or equal to 10mm, preferably may be less than or equal to 8mm, and more preferably may be less than or equal to 5 mm. When the seal 150 is not provided between the outside barrier 120 and the inside barrier 130, the space between the outside barrier 120 and the inside barrier 130 is filled with the first heat exchange medium. By setting the interval between the outside baffle 120 and the inside baffle 130 in the above-mentioned size, the flow rate of the first heat exchange medium between the outside baffle 120 and the inside baffle 130 is much lower than the flow rate of the first heat exchange medium in the heat exchange flow path 140, even without flowing. However, since the thermal conductivity of the first heat exchange medium itself, such as low temperature air, is very low, for example, the thermal conductivity of air at room temperature (20 ℃) is only 0.027W/(m.K), which is much lower than that of glass, 0.7 to 1.3W/(m.K). Therefore, the first heat exchange medium itself between the outside barrier 120 and the inside barrier 130 is a material having good heat insulating properties, and thus inward transfer of heat obtained from the second heat exchange medium outside the heat exchange tubes 10 can be effectively blocked, thereby well protecting the inside barrier 130. When the leakage of the heat exchange tube 10 is detected, the heat exchange tube 10 can be repaired in a quick and easy manner by filling the sealing member 150 of a corresponding size between the outer and inner barriers 120 and 130 in a pulling or pushing manner.

In an embodiment of the present invention, the spacing between the outboard baffle 120 and the inboard baffle 130 may be greater than or equal to 1mm, preferably may be greater than or equal to 2mm, and more preferably may be greater than or equal to 3mm, such that the seal 150 is disposed between the outboard baffle 120 and the inboard baffle 130. When the first heat exchange medium circulates between the outer baffle 120 and the inner baffle 130, the inner baffle 130 and the outer baffle 120 are cooled in a flow heat exchange manner, and the inner baffle can be effectively protected. Further, the provision of the space between the outside barrier 120 and the inside barrier 130 as described above facilitates the packing of the seal 150 between the outside barrier 120 and the inside barrier 130 when the leakage of the heat exchange tube 10 is detected.

In an embodiment of the present invention, the outer and inner barriers 120 and 130 and at least one of the first and second panels 111 and 112 may be separate and joined together by an adhesive 160. The outer side baffle and the inner side baffle are connected with at least one of the first panel and the second panel through the adhesive, so that the problem of serious stress concentration caused by integral forming of the traditional heat exchange tube through processes such as drawing and the like can be solved, the heat exchange tube made through adhesion is impact-resistant and strong in shock resistance, and complex processes such as melting, drawing, shaping, cutting, grinding and the like during manufacturing of the traditional glass tube are avoided. Because the fire-resistant temperature of the binder is lower, when a second heat exchange medium outside the heat exchange tube is over-temperature, the binder can be oxidized and fall off, the integral sealing property of the flat glass tube cannot be ensured, and the leakage of the heat exchange medium between the inside and the outside of the heat exchange tube is caused.

According to the embodiment of the present invention, by providing the sealing member 150 between the outer baffle 120 and the inner baffle 130, it is possible to increase the resistance against the leakage of the first heat exchange medium to the outside of the heat exchange tube 10 or the resistance against the leakage of the second heat exchange medium to the inside of the heat exchange tube 10, and to reduce the leakage amount of the first heat exchange medium or the second heat exchange medium. This can prevent not only the oxygen content of the second heat exchange medium outside the heat exchange tube 10 from rising but also the heat exchange efficiency and the energy recovery rate of the heat exchange tube 10 from falling.

In an embodiment of the present invention, the width of the outside barrier 120 may be smaller than the width of the inside barrier 130. In the heat exchange tube 10, the outside baffle 120 is positioned outside the inside baffle 130, closer to or exposed to the second heat exchange medium outside the heat exchange tube 10 than the inside baffle 130. Burnout and leakage due to overtemperature typically occur first between the outboard baffle 120 and the first and second panels 111, 112 (of the adhesive 160). The outside barrier 120 functions as a buffer barrier or a sacrifice barrier, and thus the width may be small, for example, set smaller than that of the inside barrier 130.

In an embodiment of the present invention, a ratio of the sum of the width of the outer barrier 120, the width of the inner barrier 130, and the interval between the outer barrier 120 and the inner barrier 130 to the widths of the first panel 111 and the second panel 112 may be less than or equal to 1:5, and preferably may be less than or equal to 1: 10. The combination of the outboard baffle 120, the inboard baffle 130, and the seal 150 disposed therebetween may be considered collectively as a baffle. By setting the widths of the three in the above manner, a larger heat exchange area can be ensured under the condition that the heat exchange medium does not leak.

Other embodiments of heat exchange tubes according to the present invention are described below in conjunction with fig. 2, 3a, 3b, 3c and 4. It should be noted that the above description of the heat exchange tube 10 of the first embodiment with reference to fig. 1 is equally applicable to the heat exchange tubes of the embodiments described below.

Fig. 2 is a cross-sectional view of a second embodiment of a heat exchange tube according to the present invention.

The difference from the first embodiment of fig. 1 is that, in the second embodiment of fig. 2, the inside barrier of the heat exchange tube 20 may comprise a first inside barrier 131 and a second inside barrier 132, and the outside barrier of the heat exchange tube 20 may comprise a first outside barrier 121 and a second outside barrier 122.

As shown in fig. 2, the heat exchange tube 20 includes first outside baffles 121 and first inside baffles 131 disposed on first sides of the first and second panels 111 and 112, and second outside baffles 122 and second inside baffles 132 disposed on second sides opposite the first sides. Specifically, the first inside barrier 131 may be disposed between the first and second outside barriers 121 and 132, and the second inside barrier 132 may be disposed between the first and second outside barriers 131 and 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 outside barrier 121 and the first inside barrier 131 and the first panel 111 and the second panel 112. The second seals 152 may be disposed between the second outboard and inboard baffles 122, 132 and the first and second panels 111, 112.

In the present embodiment, the first panel 111, the second panel 112, the first inside barrier 131, the second inside barrier 132, the first outside barrier 121, and the second outside barrier 122 may each be a separate component, and the first panel 111 and the second panel 112 may each be hermetically connected to the first inside barrier 131, the second inside barrier 132, the first outside barrier 121, and the second outside barrier 122 by the adhesive 160.

In the present embodiment, the interval between the first outside barrier 121 and the first inside barrier 131 is greater than the interval between the second outside barrier 122 and the second inside barrier 132. Accordingly, the width of the first sealing member 151 may be greater than the width of the second sealing member 152. In the gas-gas 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 may be orthogonal to each other to improve heat exchange efficiency. In the present embodiment, when the overall flow direction of the second heat exchange medium outside the heat exchange tubes 20 is a direction (e.g., a direction opposite to the Y direction in fig. 2) directed from the first outside baffle 121 to the second outside baffle 122, the first seal 151 is located on the flue gas facing side of the heat exchange tubes 20, and the second seal 152 is located on the flue gas back side of the heat exchange tubes 20. The first sealing element 151 on the smoke facing side has a larger width than the second sealing element 152 on the smoke back side, so that a stronger temperature resistance and a cooling effect are provided for the adhesive 160 between the first outer baffle 121 and the first and second panels 111 and 112, and the adhesive 160 of the first outer baffle 121 on the smoke facing side is prevented from being burnt out when the temperature is over-high.

Similar to the previous embodiment, in another embodiment, the thermal conductivity of the first seal 151 disposed between the first outside barrier 121 and the first inside barrier 131 may be less than the thermal conductivity of the second seal 152 disposed between the second outside barrier 122 and the second inside barrier 132. For example, when the first and second seals 151 and 152 are the same size, by making the first seal 151 on the flue gas facing side have a lower thermal conductivity, it is possible to provide a higher temperature resistance and a temperature reduction effect on the flue gas facing side of the heat exchange pipe 20.

Fig. 3a is a cross-sectional view, fig. 3b is a perspective view and fig. 3c is a plan view of a third embodiment of a heat exchange tube according to the present invention.

The difference from the second embodiment of fig. 2 is that, in the third embodiment of fig. 3a, 3b and 3c, the heat exchange tubes 30 further include intermediate baffles 170. For example, N intermediate baffles 170 may be disposed in the inner tube of the heat exchange tube 30 to divide the inner tube of the heat exchange tube 30 into N +1 independent heat exchange flow channels 140 sealed from each other, where N is an integer greater than or equal to 1. For example, as shown in fig. 3a, 3b and 3c, one intermediate baffle 170 may be provided at least at an intermediate position in the width direction (Y direction) of the cross section of the inner tube of the heat exchange tube 30. The intermediate baffle 170 may be, for example, in the shape of a bar. The intermediate baffle 170 may penetrate the heat exchange tube 30, for example, in the heat exchange flow channel extension direction (X direction) of the heat exchange tube 30. For example, the middle barrier 170 may be disposed in parallel with the first and second outside barriers 121 and 122, and the first and second inside barriers 131 and 132.

In an embodiment of the present invention, the intermediate baffle 170 may be sealingly joined with at least one of the first panel 111 and the second panel 112 by an adhesive 160. For example, the intermediate baffle 170 may be sealingly joined to both the first panel 111 and the second panel 112 by the adhesive 160.

In the present embodiment, as shown in fig. 3a, 3b and 3c, the heat exchange tube 30 is optionally further provided with a first blocking member 181 and a second blocking member 182. The first and second plugging members 181 and 182 may be disposed opposite to each other at both lateral sides of the heat exchange tube 30, for example, both sides of the heat exchange tube 30 in the Y direction. As shown in fig. 3b, the first and second plugging members 181 and 182 extend in the extending direction of the heat exchange flow channel 140 of the heat exchange tube 30, for example, in the X direction.

In this embodiment, the first and second closeouts 181, 182 may comprise an abutment portion comprising two abutment faces parallel to each other for abutment against the first and second panels 111, 112 and a side stop portion extending perpendicularly to the abutment faces of the abutment portion, so that the first and second closeouts 181, 182 have a T-shaped cross-sectional shape.

In the present embodiment, the first and second closeouts 181 and 182 may be sealingly coupled with the first and second panels 111 and 112, respectively, by the adhesive 160, and the first and second closeouts 181 and 182 may be made of metallic aluminum. The first and second block- offs 181, 182 made of metallic aluminum are easy to manufacture.

Although the first and second plugging members 181 and 182 are described as inner members of the heat exchange tube 30 in the present embodiment, it is understood that the first and second plugging members 181 and 182 may be members separate from the heat exchange tube 30. When the heat exchange pipe 30 is used for assembly to form a heat exchanger, a mounting plate for mounting the heat exchange pipe 30 generally has a through hole allowing the heat exchange pipe 30 to pass therethrough and fixing one end of the heat exchange pipe 30. The first panel 111, the second panel 112, the first blocking member 181 and the second blocking member 182 form an external shape conforming to the shape of the through-hole of the mounting plate, thereby sealing the through-hole.

Fig. 4 is a cross-sectional view of a fourth embodiment of a heat exchange tube according to the present invention.

The difference from the third embodiment of fig. 3a, 3b and 3c is that in the fourth embodiment of fig. 4, the heat exchange tube 40 further includes at least one reinforcing rib 190. Reinforcing ribs 190 may be provided in the heat exchange flow channel 140. In some examples, at least one of the reinforcing ribs 190 may have a bar-shaped structure, which may extend, for example, in the extending direction of the heat exchange flow channel 140 of the heat exchange tube 40, and may be disposed in parallel with the outer and/or inner baffles. In other examples, the strip-shaped structures may be arranged in an S-shape or Z-shape within the heat exchange tube 40. In still other examples, at least one of the reinforcing ribs 190 may also have a cylindrical structure, and is dispersedly disposed in the heat exchange flow channel 140 of the heat exchange tube 40. For example, the cylindrical structure may support the first and second panels 111 and 112 of the heat exchange pipe 40 at a plurality of positions in a pillar manner.

In an embodiment of the present invention, the reinforcing rib 190 may be coupled with at least one of the first panel 111 and the second panel 112 by the adhesive 160. The reinforcing ribs 190 have the effects of supporting the first panel 111 and the second panel 112, reinforcing disturbance of a heat exchange medium, and reinforcing heat transfer, and also can improve the strength of the heat exchange pipe 40 and the pressure-bearing capacity.

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

Fig. 5 is a schematic view of the structure of a heat exchanger according to the present invention.

As shown in fig. 5, according to an embodiment of the present invention, a heat exchanger 1 may include a shell 2 and a plurality of heat exchange tubes 3. The housing 2 may, for example, be substantially box-shaped. The housing 2 may comprise two mounting plates 4 arranged opposite in the X-direction. Each of the mounting plates 4 has a plurality of first through holes (not shown) formed therein. The housing 2 is formed with second through holes (not shown) on two oppositely disposed side surfaces perpendicular to the mounting plate 4 (i.e., two side surfaces of the housing 2 in the Y direction). Both ends of each heat exchange tube 3 are hermetically connected to corresponding first through holes of the mounting plate 4, respectively, to provide a flow channel of 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 tube 10, 20, 30, 40 described in the above embodiments.

As shown in fig. 5, a first heat exchange medium such as low-temperature air may enter the heat exchange tubes 3 from the mounting plate 4 on one side in the X direction (e.g., the left side in fig. 5). A first heat exchange medium such as low temperature air exchanges heat with a second heat exchange medium such as high temperature flue gas outside the heat exchange tubes 3 while passing through the heat exchange tubes 3, and then flows out from the mounting plate 4 at the other side (e.g., the right side in fig. 5). The second heat exchange medium outside the heat exchange tube 3 may enter the space between the heat exchange tube 3 and the housing 2 from the second through hole of one side (e.g., the front side in fig. 5) of the housing 2 in the-Y direction, exchange heat with the first heat exchange medium inside the heat exchange tube 3 while passing through the space between the heat exchange tube 3 and the housing 2, and then flow out from the second through hole of the other side (e.g., the rear side in fig. 5) of the housing 2.

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

Fig. 6 is a schematic flow chart of a method of manufacturing a heat exchange tube according to the present invention.

As shown in fig. 6, and in conjunction with fig. 1, a method of manufacturing a heat exchange tube 10 may include the steps of:

providing a first panel 111 and a second panel 112 disposed opposite to each other;

providing an outer baffle 120 and an inner baffle 130 arranged between the first panel 111 and the second panel 112, arranging the outer baffle 120 outside the inner baffle 130, and enclosing the inner baffle 130 with the first panel 111 and the second panel 112 at the side opposite to the outer baffle 120 to form a heat exchange flow channel 140; and

a seal 150 is provided between the inside baffle 120 and the inside baffle 130 for blocking the transfer of media between the inside baffle 130 and the outside baffle 120.

It should be noted that the method of manufacturing the heat exchange tube 10 according to the present invention is not limited to the above. For example, after the outside barrier 120 and the inside barrier 130 are fixed to the first panel 111 (or the second panel 112), the seal 150 may be disposed in the groove formed by the outside barrier 120, the inside barrier 130, and the first panel 111, and then the second panel 112 is opposed to and fixed to the first panel 111, thereby forming the heat exchange tube 10, for example, as shown in fig. 1.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the utility model as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (31)

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,

the outer side baffle is arranged on the outer side of the inner side baffle, the inner side baffle is surrounded with the first panel and the second panel on the side opposite to the outer side baffle to form a heat exchange channel, and the heat exchange tube further comprises a sealing piece arranged between the outer side baffle and the inner side baffle and used for blocking the medium transmission between the outer side baffle and the inner side baffle.

2. The heat exchange tube of claim 1, wherein the seal comprises a solid-formed sealing material.

3. The heat exchange tube of claim 2, wherein the seal is a packing formed by braiding flexible wires.

4. The heat exchange tube of claim 1, wherein the seal is formed by curing a liquid sealant.

5. A 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 either of the outside and inside baffles is less than or equal to 1: 2.

6. A 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 either of the outside and inside baffles is less than or equal to 1: 5.

7. A 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 either of the outside and inside baffles is less than or equal to 1: 10.

8. The heat exchange tube of claim 5, wherein the first and second face sheets, the outer baffle, and the inner baffle are made of one of glass, ceramic, graphite, and silicon carbide.

9. A heat exchange tube according to claim 2 or 3, wherein the seal comprises an inorganic sealing material.

10. A heat exchange tube according to claim 2 or 3, wherein the sealing member comprises asbestos or ceramic fibers.

11. The heat exchange tube of claim 1, wherein the seal comprises an organic sealing material.

12. The heat exchange tube of claim 1, wherein the seal comprises polytetrafluoroethylene, polyimide, or silicone rubber.

13. The heat exchange tube of claim 1 wherein the ratio of the spacing between the outside and inside baffles to the width of the heat exchange flow channel is less than or equal to 1: 10.

14. The heat exchange tube of claim 1, wherein the ratio of the interval between the outer baffles and the inner baffles to the width of the heat exchange flow channel is 1:30 to 1: 20.

15. The heat exchange tube of claim 13, wherein the spacing between the outside and inside baffles is less than or equal to 10 mm.

16. The heat exchange tube of claim 13, wherein the spacing between the outside and inside baffles is less than or equal to 8 mm.

17. The heat exchange tube of claim 13, wherein the spacing between the outside and inside baffles is less than or equal to 5 mm.

18. The heat exchange tube of claim 15, wherein the spacing between the outside and inside baffles is greater than or equal to 1mm such that the seal is disposed between the outside and inside baffles.

19. The heat exchange tube of claim 15, wherein the spacing between the outside and inside baffles is greater than or equal to 2mm such that the seal is disposed between the outside and inside baffles.

20. The heat exchange tube of claim 15, wherein the spacing between the outside and inside baffles is greater than or equal to 3mm such that the seal is disposed between the outside and inside baffles.

21. The heat exchange tube of claim 1, wherein the outside and inside baffles are separate from at least one of the first and second panels and are joined together by an adhesive.

22. The heat exchange tube of claim 1, wherein the width of the outside baffle is less than the width of the inside baffle.

23. The heat exchange tube of claim 1, wherein the ratio of the sum of the width of the outside baffle, the width of the inside baffle, and the spacing between the outside and inside baffles to the width of the first and second panels is less than or equal to 1: 5.

24. The heat exchange tube of claim 1, wherein the ratio of the sum of the width of the outside baffle, the width of the inside baffle, and the spacing between the outside and inside baffles to the width of the first and second panels is less than or equal to 1: 10.

25. A heat exchange tube according to claim 1, wherein the outboard and inboard baffles are disposed on a first side of the first and second panels, and the tube further comprises a single, opposite side baffle disposed on a second side opposite the first side for enclosing a heat exchange runner with the first and second panels.

26. The heat exchange tube of claim 1, wherein the inside baffles comprise a first inside baffle and a second inside baffle, the outside baffles comprise a first outside baffle and a second outside baffle, the first inside baffle is disposed between the first and second outside baffles, and the second inside baffle is disposed between the first and second outside baffles.

27. The heat exchange tube of claim 26, wherein the spacing between the first outside baffle and the first inside baffle is greater than the spacing between the second outside baffle and the second inside baffle.

28. The heat exchange tube of claim 27, wherein the thermal conductivity of the seal disposed between the first outside baffle and the first inside baffle is less than the thermal conductivity of the seal disposed between the second outside baffle and the second inside baffle.

29. The heat exchange tube of claim 1, wherein the heat exchange tube is a gas-to-gas heat exchange tube.

30. A heat exchanger, comprising:

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

a plurality of heat exchange tubes, both ends of each heat exchange tube are respectively connected to the corresponding first through holes of the mounting plate in a sealing manner,

wherein at least one of the plurality of heat exchange tubes is a heat exchange tube according to any one of claims 1 to 29.

31. The heat exchanger of claim 30, wherein the heat exchanger is an air preheater.

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