Heat exchange tube, heat exchanger, and gas heat exchange method using heat exchanger

Abstract

The application discloses a heat exchange tube, which comprises panels opposite to each other and side baffles opposite to each other, and the panels and the side baffles enclose an internal passage; the heat exchange tube further comprises a sealing fixing part, which comprises a first fixing part, a second fixing part and a connecting part connecting the first fixing part and the second fixing part, and is arranged such that the first fixing part and the second fixing part are located at two sides of the side baffle respectively, and the connecting part is located outside an end of the side baffle. By arranging the sealing fixing part, the side baffle can be effectively prevented from sliding to the inside of the heat exchange tube, the overall tubular passage structure of the heat exchange tube is effectively prevented from being damaged, and meanwhile, the sealing structure between the side baffle and the panel is also protected. The application further discloses a heat exchanger comprising the heat exchange tube and a gas heat exchange method based on the heat exchanger.

Description

TECHNICAL FIELD

[0001] The present application relates to gas-gas heat exchange technology, and in particular to a heat exchanger, a heat exchange tube and a heat exchange method for gas-gas heat exchange. BACKGROUND

[0002] In a flue gas waste heat recovery device or a flue gas cooling device, a gas-gas heat exchanger is needed to achieve heat exchange between flue gas and air. According to different application occasions, such a gas-gas heat exchanger can be, for example, an air preheater and a flue gas air cooler. In order to maximize energy recovery or obtain better cooling effect, it is generally desirable that the temperature of the flue gas after heat exchange is lower and the temperature of the air is higher. However, when the flue gas temperature is reduced below the condensation dew point, acid dew will be produced, which will cause corrosion of the heat exchange tube and reduce the service life of the heat exchanger.

[0003] To this end, a heat exchange tube made of corrosion-resistant materials such as glass and ceramic is proposed in Chinese patent application No. 201711288625.2, entitled "Heat exchange tube, heat exchanger comprising it and manufacturing method of heat exchange tube". The heat exchange tube has a flat-shaped internal passage enclosed by a heat exchange panel and a side baffle, and is sealed and connected together by an adhesive. This heat exchange tube can overcome the corrosion problem of the heat exchange tube caused by flue gas condensation, and is easy to manufacture. However, this technology is not without defects. The high temperature of the flue gas can easily cause damage to the adhesive, making it difficult to maintain the sealing of the heat exchange tube, thereby failing to isolate the gas medium inside and outside the heat exchange tube, resulting in medium leakage and mutual contamination. SUMMARY

[0004] The purpose of the present application is to provide a heat exchange tube, a heat exchanger and a gas heat exchange method using the heat exchanger, to at least partially overcome the deficiencies in the prior art.

[0005] According to an aspect of the present application, there is provided a heat exchange tube comprising two panels opposite to each other and two side baffles opposite to each other, the panels and the side baffles enclosing an internal passage of the heat exchange tube, wherein at least one side baffle is separate from the two panels and sealingly coupled together, the at least one side baffle having a strip structure extending in a first direction and having an upper abutting surface and a lower abutting surface for abutting with the two panels in a direction perpendicular to the panels, respectively; and the heat exchange tube further comprises a sealing fixing member comprising a first fixing portion, a second fixing portion and a connecting portion connected between the first fixing portion and the second fixing portion, wherein the sealing fixing member is arranged such that the first fixing portion and the second fixing portion are located on two sides of the at least one side baffle in a second direction parallel to the panels and perpendicular to the first direction, respectively, the first fixing portion abuts on edges of the two panels in the second direction, the second fixing portion is located between the two panels, and the connecting portion is located outside of one end of the at least one side baffle in the first direction.

[0006] Preferably, the first fixing portion, the connecting portion and the second fixing portion of the sealing fixing member form a substantially U-shaped groove.

[0007] Preferably, the first fixing portion and the second fixing portion have an elongated shape extending in the first direction.

[0008] Preferably, the first fixing portion comprises a horizontal blocking portion and a fitting portion protruding from the horizontal blocking portion towards the second fixing portion, and in a direction perpendicular to the panels, a width of the horizontal blocking portion is greater than an inner distance between the two panels, and a width of the fitting portion is less than the inner distance between the two panels and is located in a middle portion of the horizontal blocking portion.

[0009] Preferably, the horizontal blocking portion has an upper positioning surface and a lower positioning surface extending in the first direction and perpendicular to the second direction, for abutting with edges of the two panels, respectively.

[0010] Preferably, the fitting portion has a middle positioning surface perpendicular to the second direction, for abutting with the at least one side baffle.

[0011] Preferably, in a direction perpendicular to the panels, an outermost edge of the horizontal blocking portion is flush with the two panels, and a side of the horizontal blocking portion opposite to the fitting portion has an arc-shaped profile in a cross section perpendicular to the first direction.

[0012] Advantageously, the connecting portion has an elongated shape extending in the second direction.

[0013] Advantageously, a length of the second fixing portion is greater than a length of the first fixing portion.

[0014] In some embodiments, the sealing fixture further comprises an additional first fixing portion and an additional connecting portion connected between the additional first fixing portion and the second fixing portion, the additional first fixing portion and the additional connecting portion have substantially symmetrical structures with the first fixing portion and the connecting portion, and the additional first fixing portion and the second fixing portion are respectively located on two sides of the at least one side baffle in the second direction, the additional first fixing portion abuts against edges of the two panels in the second direction, and the additional connecting portion is located outside of another end portion of the at least one side baffle in the first direction.

[0015] In some other embodiments, the sealing fixture further comprises an additional second fixing portion and an additional connecting portion connected between the first fixing portion and the additional second fixing portion, the additional second fixing portion and the additional connecting portion have substantially symmetrical structures with the second fixing portion and the connecting portion, and the first fixing portion and the additional second fixing portion are respectively located on two sides of the at least one side baffle in the second direction, the additional second fixing portion is located between the two panels, and the additional connecting portion is located outside of another end portion of the at least one side baffle in the first direction.

[0016] Preferably, a spacing between the first fixing portion and the second fixing portion in the second direction is substantially the same as a width of the at least one side baffle in the second direction.

[0017] Advantageously, the connecting portion and at least one of the first fixing portion and the second fixing portion are fixed together by welding or threaded connection.

[0018] Advantageously, the sealing fixture is bonded together with the panels and the at least one side baffle by an adhesive.

[0019] Preferably, the panels and the side baffle are made of at least one material of glass, ceramic, graphite, silicon carbide, and the sealing fixture is made of a metallic material.

[0020] According to another aspect of the present application, there is also provided a heat exchanger comprising a housing having an internal space and a plurality of heat exchange tubes supported on the housing and passing through the internal space of the housing, wherein at least one of the heat exchange tubes is a heat exchange tube as described above.

[0021] Preferably, the heat exchanger is a gas-gas heat exchanger for a first gas and a second gas having a lower pressure relative to the first gas, wherein a space between the heat exchange tubes and the housing constitutes a flow passage of the first gas, and an internal passage of the heat exchange tube constitutes a flow passage of the second gas.

[0022] Preferably, the shell comprises two sealing plates oppositely arranged, a plurality of mounting through holes are formed on each of the sealing plates, and two ends of the at least one heat exchange pipe are sealingly connected with the mounting through holes through the sealing fixing members.

[0023] According to still another aspect of the present application, there is also provided a gas heat exchange method using the heat exchanger as described above, which comprises: feeding a first gas into the internal space of the shell to flow through between the heat exchange pipes and the shell; and feeding a second gas having a lower pressure relative to the first gas into the heat exchange pipes to flow through the internal passages of the heat exchange pipes.

[0024] According to still another aspect of the present application, there is also provided a heat exchanger, which comprises a shell having an internal space and a plurality of heat exchange pipes supported on the shell and penetrating through the internal space of the shell, wherein:

[0025] the heat exchange pipe comprises two panels and two side baffles oppositely arranged, the panels and the side baffles are enclosed to define an internal passage of the heat exchange pipe, at least one side baffle is separate from the two panels and sealingly bonded together, the at least one side baffle has a strip structure extending along a first direction, and has an upper abutting surface and a lower abutting surface for abutting and connecting with the two panels along a direction perpendicular to the panels, respectively; and

[0026] the heat exchanger is a gas-gas heat exchanger for a first gas and a second gas having a lower pressure relative to the first gas, wherein the space between the heat exchange pipes and the shell constitutes a flow passage of the first gas, and the internal passage of the heat exchange pipe constitutes a flow passage of the second gas.

[0027] According to the heat exchanger of the present application, the internal passage of the heat exchange pipe constitutes a flow passage of the low-pressure gas, and the space between the heat exchange pipe and the shell constitutes a flow passage of the high-pressure gas, which can significantly reduce the manufacturing requirements of the heat exchange pipe, and greatly reduce the risk of sealing failure of the heat exchange pipe during the operation of the heat exchanger.

[0028] According to the heat exchange pipe of the present application, the sealing fixing member arranged in the heat exchange pipe can effectively prevent the side baffle from sliding to the inside of the heat exchange pipe, effectively avoid damaging the overall tubular passage structure of the heat exchange pipe, and also facilitate protecting the sealing structure between the side baffle and the panel. BRIEF DESCRIPTION OF DRAWINGS

[0029] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof, read in conjunction with the accompanying drawings:

[0030] Figure 1 is a perspective view of an example of a heat exchanger according to an embodiment of the present application;

[0031] Figure 2 is a perspective view of an example of a heat exchange tube according to an embodiment of the present application;

[0032] Figure 3 is a perspective view of a portion of the heat exchange tube shown in Figure 2 , with the upper side panel of the heat exchange tube removed to reveal the internal construction;

[0033] Figure 4 is a perspective view of a portion of the heat exchange tube shown in Figure 3 , with the sealing fixture removed;

[0034] Figure 5 is a perspective view of a portion of the heat exchange tube shown in Figure 1 , with the sealing fixture removed;

[0035] Figure 6 , Figure 7 and Figure 8 show different examples of sealing fixtures that can be used in heat exchange tubes according to embodiments of the present application;

[0036] Figure 9 is a perspective view of another example of a heat exchange tube according to an embodiment of the present application, with the upper side panel of the heat exchange tube removed to reveal the internal construction;

[0037] Figure 10 is a perspective view of a portion of the heat exchange tube shown in Figure 9 , with the sealing fixture removed;

[0038] Figure 11 is a perspective view of a sealing fixture that can be used in other examples of heat exchange tubes according to embodiments of the present application;

[0039] Figure 12 is a gas heat exchange method using a heat exchanger according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] The present application will be further described with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. For the sake of clarity, only parts of the application are shown in the drawings. It is to be understood that the embodiments and features of the embodiments in the present application can be combined with each other, without conflict.

[0041] Figure 1 is a perspective view of an example of a heat exchanger according to an embodiment of the present application. As Figure 1As shown, the heat exchanger 1 includes a housing 10 and a plurality of heat exchange tubes 100, wherein the housing 10 is formed to have an internal space, and the plurality of heat exchange tubes 100 are supported on the housing 10 and pass through the internal space of the housing 10. Specifically, as Figure 1 As shown, the housing 10 may include two sealing plates 11 arranged opposite to each other. Multiple mounting through holes 11a are formed on the sealing plates 11 respectively. The two ends of the heat exchange tube 100 pass through the mounting through holes 11a and cooperate with the mounting through holes 11a to form a sealed connection.

[0042] Figure 2 It shows that it can be used Figure 1 An example of the heat exchange tube 100 of the heat exchanger 1 shown. Figure 2 As shown, the heat exchange tube 100 includes two panels 110 arranged opposite to each other and two side baffles 120 arranged opposite to each other, and the panels 110 and side baffles 120 together enclose and define the internal channel of the heat exchange tube 100. Preferably, the panels 110 and side baffles 120 in the heat exchange tube 100 are made of corrosion-resistant materials such as glass, ceramic, graphite or silicon carbide, which improves the corrosion resistance of the heat exchange tube and the heat exchanger, thereby improving the heat exchange efficiency.

[0043] exist Figure 2 In the example shown, the two panels 110 and the two side panels 120 are separate from each other. However, it should be understood that the invention is not limited to the above-described situation. For example, one of the side panels 120 may be materially continuous or fixedly connected to the upper and lower panels 110. This can be achieved, for example, by folding a glass plate in its fused state to form a folded structure with a "U"-shaped cross-section. Alternatively, one of the side panels 120 may be materially continuous or fixedly connected to one of the panels 110. This can be achieved, for example, by bending or welding.

[0044] The structure of the heat exchange tube 100 is advantageous for processing materials such as glass, ceramics, graphite, and silicon carbide, which are corrosion-resistant but have poor machinability, and facilitates the manufacture of heat exchange tubes.

[0045] Although not shown, the discrete components of the heat exchange tube 100 can be sealed with sealant or other sealing materials.

[0046] Return to reference Figure 1According to a preferred embodiment of the present invention, the heat exchanger 1 is constructed such that the internal channels of the heat exchange tube 100 constitute a flow channel for low-pressure gas, while the space between the heat exchange tube 100 and the shell 10 constitutes a flow channel for high-pressure gas. Here, "low-pressure gas" and "high-pressure gas" are gases with relatively lower or higher pressures. Thus, when the heat exchanger 1 according to the embodiment of the present invention is in operation, the low-pressure gas flows through the internal channels of the heat exchange tube 100, and the high-pressure gas flows through the space between the heat exchange tube 100 and the shell 10, resulting in a pressure difference between the inside and outside of the heat exchange tube 100.

[0047] like Figure 2 As shown, in the preferred embodiment described above, under the pressure difference between the high-pressure gas and the low-pressure gas, the heat exchange tube 100 is subjected to an inward squeezing force. In particular, the two panels 110 are pressed tightly against each other under the pressure difference, thereby compressing the gap between the panels 110 and the side baffles 120 in the heat exchange tube 100. This compression effect, on the one hand, keeps the panels 110 and the side baffles 120 of the heat exchange tube 100 together, forming a more robust tube structure; on the other hand, it helps to form and maintain a good sealing state of the heat exchange tube 100, effectively isolating the gas medium inside and outside the heat exchange tube.

[0048] In this case, it is not necessary to use a particularly strong adhesive to fix the heat exchange tubes to each other with the side baffles, or even any adhesive at all. Here, "particularly strong adhesive" refers to an adhesive with the bonding strength required in conventional heat exchangers to maintain the connection and seal between the heat exchange tubes' panels and side baffles. For example, taking a conventional tubular furnace air preheater as an example, with a heat exchange tube having a panel width of 400 mm and a side baffle width of 20 mm, the adhesive must provide a bonding strength of at least 20,000 Pa to seal the panels and side baffles, and such bonding strength needs to be maintained for a long time under the heat exchanger's operating conditions (e.g., around 150°C, or even higher). However, in the preferred heat exchanger according to the above embodiments of the present invention, the adhesive used in the heat exchange tubes can, for example, only provide a certain bonding strength at room temperature (approximately the bonding strength required to overcome the material's own weight) for the installation and transportation of the heat exchange tubes themselves, and may have no bonding strength under operating conditions (e.g., around 150°C). For example, taking a heat exchange tube with a panel width of 400 mm and a side baffle width of 20 mm as an example, the material used is glass (panel thickness 3.2 mm, side baffle thickness 10 mm, glass density 2.23 g / cm³). 3 At room temperature, the bonding force required to overcome the material's own weight is only about 1000 Pa.

[0049] In addition, instead of using sealant between the face plate and the side baffle of the heat exchange tube, other sealing materials that can provide airtight sealing under compaction, such as carbon fiber packing, polytetrafluoroethylene sealing tape, silicone rubber sealing tape, etc. can be used to achieve sealing.

[0050] In summary, it can be seen that, according to the heat exchanger of the preferred embodiment of the present application, the internal passage of the heat exchange tube constitutes the flow passage of the low-pressure gas, and the space between the heat exchange tube and the shell constitutes the flow passage of the high-pressure gas, which can significantly reduce the manufacturing requirements of the heat exchange tube, and greatly reduce the risk of sealing failure of the heat exchange tube during operation of the heat exchanger.

[0051] Next, with reference to Figure 2 and Figure 3 the heat exchange tube according to the preferred embodiment of the present application is introduced. Figure 2 An example of the heat exchange tube 100 is shown, Figure 3 An example of the heat exchange tube 100 is shown, Figure 2 A part of the heat exchange tube 100 is shown, in which the upper face plate 110 of the heat exchange tube 100 is removed to expose the internal structure.

[0052] As shown in Figure 3 more clearly, each of the two side baffles 120 of the heat exchange tube 100 has a strip-shaped structure extending in the x direction, and has an upper abutting surface and a lower abutting surface, which abut against the upper and lower face plates 110, respectively, in a direction perpendicular to the face plate 110 (z direction shown in the figure). Figure 3

[0053] According to the preferred embodiment of the present application, as shown in Figure 3 the heat exchange tube 100 further comprises a sealing fixing member 130, which comprises a first fixing portion 131, a second fixing portion 132, and a connecting portion 133 connected between the first fixing portion 131 and the second fixing portion 132. Figure 2 and Figure 3 In the example shown in Figure 3 the sealing fixing member 130 is arranged on each end of the two side baffles 120, so that the first fixing portion 131 and the second fixing portion 132 are respectively located on the two sides of the side baffle 120 in the y direction parallel to the face plate 110 and perpendicular to the x direction. Specifically, as shown in

[0054] ​The above-mentioned preferred structure of the sealing fixing member of the heat exchange tube mainly takes into consideration that, in the case where the heat exchanger is configured such that the internal passage of the heat exchange tube constitutes a flow passage of low-pressure gas and the space between the heat exchange tube and the shell constitutes a flow passage of high-pressure gas, under the action of the pressure difference between the inside and outside of the heat exchange tube, the side baffle is subjected to the action force of being pressed to the inside of the heat exchange tube, thereby generating the movement or movement tendency of sliding to the inside between the two face plates, and the sliding of the side baffle will affect or even destroy the tubular passage of the heat exchange tube, and even the movement tendency of the sliding of the side baffle will affect or even destroy the sealing structure between the side baffle and the face plate.

[0055] In view of the above, as mentioned above with reference to Figure 3 According to the preferred embodiment of the present application, the sealing fixing member 130 is arranged in the heat exchange tube 100, the first fixing part 131 of the sealing fixing member 130 is positioned relative to the edge of the face plate 110 by abutting against the edge in the y direction, so that the first fixing part 131 is positioned relative to the edge of the face plate; the second fixing part 132 is positioned relative to the first fixing part 131 through the connecting part 133, and the second fixing part 132 is located on the inside of the heat exchange tube relative to the side baffle 120, so that the second fixing part 132 can effectively prevent the side baffle 120 from sliding to the inside of the heat exchange tube, effectively avoiding the destruction of the overall tubular passage structure of the heat exchange tube by the pressure difference between the inside and outside, and at the same time, it is also beneficial to protect the sealing structure between the side baffle and the face plate.

[0056] In addition, Figure 2 and Figure 3 The structure and arrangement of the sealing fixing member 130 are particularly beneficial to the assembly of the sealing fixing member 130 in the heat exchange tube 100. In some cases, as shown in Figure 3 Before the upper face plate is assembled, the sealing fixing member 130 can be clamped on the end of the side baffle 120 in advance. More advantageously, the heat exchange tube according to the embodiment of the present application allows the installation and removal of the sealing fixing member 130 by inserting or pulling out the sealing fixing member 130 from both ends of the side baffle 120 after the face plate and the side baffle are assembled together. This is particularly advantageous for the maintenance of the heat exchanger, because the above-mentioned installation and removal process can be completed without disassembling the heat exchange tube from the shell of the heat exchanger.

[0057] Preferably, the panels 110 and the side plates 120 are made of at least one of glass, ceramic, graphite, silicon carbide, and the sealing fixture 130 is made of a metal material. The metal material has good mechanical processing performance and is easy to manufacture the sealing fixture; moreover, the metal material has good toughness, so that the stress generated at both ends of the connecting portion 133 in the working state is not easy to cause the sealing fixture to fail. Although the metal material has a deficiency in corrosion resistance, as discussed above, the sealing fixture in the above embodiment according to the present application is easy to install and disassemble, so even if the sealing fixture fails due to corrosion, it can be conveniently and timely replaced, and the impact on the operation of the heat exchanger is small.

[0058] Advantageously, the inner distance between the first fixing portion 131 and the second fixing portion 132 in the y direction is substantially the same as the width of the corresponding side plate 120 in the y direction.

[0059] Advantageously, the sealing fixture 130 can be bonded to the panels 110 and the side plates 120 by an adhesive.

[0060] In addition, as shown in Figure 2 and Figure 3 , the heat exchange tube 100 can also include an intermediate partition plate 140, which can be used to provide intermediate support for the panels 110; in addition, it can also be used to divide the internal passage of the heat exchange tube 100 into different passages.

[0061] Figure 4 As shown in Figure 3 , a perspective view of the sealing fixture 130 in the heat exchange tube 100. In the example shown in Figure 4 , the first fixing portion 131, the connecting portion 133 and the second fixing portion 132 of the sealing fixture 130 form a substantially U-shaped groove. Advantageously, the first fixing portion 131 and the second fixing portion 132 have an elongated shape extending in the x direction.

[0062] Preferably, as shown in Figure 4 , the first fixing portion 131 includes a transverse portion 131a and a fitting portion 131b extending from the transverse portion 131a towards the second fixing portion 132, wherein the width of the transverse portion 131a is greater than the inner distance between the two panels 110 in the z direction perpendicular to the panels 110, so as to abut against the edges of the two panels 110 in the y direction; the width of the fitting portion 131b is less than the inner distance between the two panels 110 and is located in the middle of the transverse portion 131a, so as to be fitted between the two panels 110, thereby increasing the installation stability of the sealing fixture 130.

[0063] As shown in Figure 4 , the second fixing portion 132 includes a transverse portion 132a and a fitting portion 132b extending from the transverse portion 132a towards the first fixing portion 131, wherein the width of the transverse portion 132a is greater than the inner distance between the two panels 110 in the z direction perpendicular to the panels 110, so as to abut against the edges of the two panels 110 in the y direction; the width of the fitting portion 132b is less than the inner distance between the two panels 110 and is located in the middle of the transverse portion 132a, so as to be fitted between the two panels 110, thereby increasing the installation stability of the sealing fixture 130.As shown, preferably, the cross-bar portion 131a can have an upper positioning surface pi and a lower positioning surface p2 extending along the x-direction and perpendicular to the y-direction, for abutting against the edges of the two panels 110, respectively. The fitting portion 131b can have a middle positioning surface p3 perpendicular to the y-direction, for abutting against the side baffle 120.

[0064] In Figure 4 In the example shown, the connecting portion 133 has an elongated shape extending along the y-direction. However, the connecting portion 133 is not limited to such an elongated shape, but can for example be formed in an arc-shaped pull-tab shape, thereby combining the function of connecting the first and second fixing portions 131, 132 and the function of a handle for gripping the sealing fixture 130 when mounting or dismounting.

[0065] Figure 5 For Figure 1 In the partial enlarged view of the heat exchanger 1 shown, the end portions of the heat exchanger tubes 100 can cooperate with the mounting through-holes 11a by means of the sealing fixture 130, as shown in the partial enlarged view. Preferably, as shown in the partial enlarged view, the outermost edges of the cross-bar portion 131a are flush with the two panels 110 in the z-direction perpendicular to the panels 110, and the side of the cross-bar portion 131a opposite to the fitting portion 131b has an arc-shaped profile in a cross-section perpendicular to the x-direction. In this way, the sealing fixture 130 forms a smooth and even profile together with the panels 110 in a cross-section of the heat exchanger tubes, which is advantageous for the cooperative mounting and sealing connection with the mounting through-holes 11a. Figure 4

[0066] Figure 4 The sealing fixture 130 shown is a one-piece component, however this is not necessarily the case. For example, Figure 6 and Figure 7 Two different examples of the sealing fixture are shown, namely the sealing fixtures 130' and 130", in which the connecting portion 133 is one piece with the second fixing portion 132 and is fixed together with the first fixing portion 131 by means of a screw s. In other examples, the above-mentioned components can also be fixed together by means of welding. In yet other examples, the connecting portion can be one piece with the first fixing portion, which in turn is fixedly connected or detachably connected with the second fixing portion.

[0067] Furthermore, although Figure 4 , Figure 6 , Figure 7 The first fixing portion and the second fixing portion of the sealing fixture shown in Figs. 1 to 6 have substantially the same length, however this is not necessarily the case. In other examples, for example the sealing fixture 130" shown in Fig. 7, the second fixing portion 132 has a greater length than the first fixing portion 131. This is advantageous for the second fixing portion 132 to better prevent a sliding motion of the side baffle 120. Figure 8

[0068] ​​Figure 6 、 Figure 7 and Figure 8 may have the same or similar structure as the sealing fixture shown in Figure 4 , which will not be described here again.

[0069] Next, other examples of the heat exchange tube and the sealing fixture therein according to embodiments of the present application will be described with reference to Figure 9 to Figure 11 .

[0070] Figure 9 is a perspective view of a heat exchange tube 200 according to an embodiment of the present application, in which an upper side panel of the heat exchange tube 200 is removed to expose the internal structure. Figure 10 is a perspective view of a sealing fixture 230 in the heat exchange tube 200.

[0071] Figure 9 The heat exchange tube 200 shown in Figure 2 and Figure 3 has substantially the same structure as the heat exchange tube 100 shown in , specifically, the heat exchange tube 200 includes two side panels 210 arranged opposite to each other and two side baffles 220 arranged opposite to each other, and the side panels 210 and the side baffles 220 together define an internal passage of the heat exchange tube 200.

[0072] Figure 9 The heat exchange tube 200 further includes a sealing fixture 230, which, as shown in Figure 10 and Figure 9 , includes a first fixing portion 231, a second fixing portion 232, and a connecting portion 233 connected between the first fixing portion 231 and the second fixing portion 232; the sealing fixture 230 further includes an additional first fixing portion 231A and an additional connecting portion 233A connected between the additional first fixing portion 231A and the second fixing portion 232, and the additional first fixing portion 231A and the additional connecting portion 233A have substantially symmetrical structure with the first fixing portion 231 and the connecting portion 233. As shown in , the sealing fixture 230 is arranged such that the first fixing portion 231, the additional first fixing portion 231A, and the second fixing portion 232 are respectively located on both sides of the side baffles 220 in the y direction, wherein the first fixing portion 231 and the additional first fixing portion 231A abut against the edges of the two side panels 210 in the y direction, the second fixing portion 232 is located between the two side panels 210, and the connecting portion 233 and the additional connecting portion 233A are located outside the respective end portions of the side baffles 220 in the x direction.

[0073] Figure 11 shows another example of the sealing fixture that can be used in the heat exchange tube according to embodiments of the present application. Figure 11 The sealing fixture 330 shown in Figure 10The sealing fixture 230 shown has a similar structure, except that the two ends of the single longitudinal second fixing part 232 in the sealing fixture 230 are connected to the first fixing part 231 and the additional first fixing part 231A through the connecting part 233 and the additional connecting part 233A respectively; while the two ends of the single longitudinal first fixing part 331 in the sealing fixture 330 are connected to the second fixing part 332 and the additional second fixing part 332A through the connecting part 333 and the additional connecting part 333A respectively, the additional second fixing part and the additional connecting part have a structure substantially symmetrical to the second fixing part and the connecting part.

[0074] Although the heat exchange tube assembled with the sealing fixture 330 is not shown, based on the above introduction, those skilled in the art can understand that the sealing fixture 330 is arranged in the heat exchange tube such that the first fixing part 331 abuts against the edges of the two panels in the y direction, the second fixing part 332 and the additional second fixing part 332A are located between the two panels, and the connecting part 333 and the additional connecting part 333A are located outside the corresponding end of the side baffle in the x direction.

[0075] Figure 10 And Figure 11 The sealing fixture shown can be selected according to the corrosiveness of the gas medium inside and outside the heat exchange tube. For example, if the gas medium on the outside of the heat exchange tube is corrosive, while the gas medium on the inside is clean, the sealing fixture 230 shown can be selected; on the contrary, the sealing fixture 330 shown can be selected. Figure 10 The sealing fixture 230 shown; on the contrary, the sealing fixture 330 shown can be selected. Figure 11 The sealing fixture 230 shown; on the contrary, the sealing fixture 330 shown can be selected.

[0076] Figure 10 And Figure 11 The sealing fixture shown can have the same or similar structure as the sealing fixture shown in the above aspects not introduced, which will not be described here. Figure 4

[0077] Finally, the method of gas heat exchange using the heat exchanger according to the embodiment of the present application is introduced. Figure 12 The flow chart of the method M10 is shown. As Figure 12 shown, based on the heat exchanger 1 according to the embodiment of the present application as introduced above, the gas heat exchange method M10 includes:

[0078] S11: sending the first gas into the internal space of the housing to flow through between the heat exchange tube and the housing; and

[0079] S12: sending the second gas with lower pressure relative to the first gas into the heat exchange tube to flow through from the internal passage of the heat exchange tube. ​

[0080] Method M10 has two meanings: one, the method requires that the first gas with relatively high gas pressure is used as the shell side heat exchange medium, and the second gas with relatively low gas pressure is used as the tube side heat exchange medium; two, at the beginning of heat exchange, the shell side heat exchange medium is first sent into the heat exchanger. The technical effects of the first aspect have been described in detail in the introduction of the heat exchanger 1 according to the preferred embodiment of the application; the second aspect is still meaningful from the perspective of the method of operating the equipment, because the shell side heat exchange medium is first sent into the heat exchanger shell, which is beneficial to the sealing of the heat exchange tubes of the tubular structure formed by the panels and the side baffles, and effectively prevents the leakage of the gas inside and outside the heat exchange tubes when the tube side heat exchange medium is received subsequently.

[0081] The above description is merely preferred embodiments of the present application and a description of the technical principles used. It should be understood by those skilled in the art that the scope of the application disclosed in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combinations of the technical features described above or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above-described features and the technical features disclosed in the present application (but not limited to) with similar functions.

Claims

1. A heat exchange tube comprising two panels opposing each other and two side baffles opposing each other, the panels and the side baffles enclosing an internal passage of the heat exchange tube, wherein, at least one side baffle is separate from the two panels and sealingly coupled together, the at least one side baffle has a strip structure extending in a first direction and has an upper abutting surface and a lower abutting surface for abutting against the two panels in a direction perpendicular to the panels, respectively; and the heat exchange tube further comprises a sealing fixture comprising a first fixing portion, a second fixing portion, and a connecting portion connected between the first fixing portion and the second fixing portion, wherein the sealing fixture is arranged such that the first fixing portion and the second fixing portion are located on both sides of the at least one side baffle in a second direction parallel to the panels and perpendicular to the first direction, the first fixing portion abuts against edges of the two panels in the second direction, the second fixing portion is located between the two panels, and the connecting portion is located outside one end of the at least one side baffle in the first direction.

2. The heat exchange tube of claim 1, wherein, The first fixing portion, the connecting portion, and the second fixing portion of the sealing fixture form a U-shaped groove.

3. The heat exchange tube of claim 1, wherein, The first fixing portion and the second fixing portion have an elongated shape extending in the first direction.

4. The heat exchange tube of claim 2, wherein, The first fixing portion and the second fixing portion have an elongated shape extending in the first direction.

5. The heat exchange tube of claim 1, wherein, The first fixing portion comprises a horizontal blocking portion and a fitting portion extending from the horizontal blocking portion towards the second fixing portion, in a direction perpendicular to the panels, a width of the horizontal blocking portion is greater than an inner distance between the two panels, and a width of the fitting portion is less than the inner distance between the two panels and is located in a middle portion of the horizontal blocking portion.

6. The heat exchange tube of claim 2, wherein, The first fixing portion comprises a horizontal blocking portion and a fitting portion extending from the horizontal blocking portion towards the second fixing portion, in a direction perpendicular to the panels, a width of the horizontal blocking portion is greater than an inner distance between the two panels, and a width of the fitting portion is less than the inner distance between the two panels and is located in a middle portion of the horizontal blocking portion.

7. The heat exchange tube of claim 5, wherein, The horizontal blocking portion has an upper positioning surface and a lower positioning surface extending in the first direction and perpendicular to the second direction, for abutting against edges of the two panels, respectively.

8. The heat exchange tube of claim 5, wherein, The fitting portion has a middle positioning surface perpendicular to the second direction, for abutting against the at least one side baffle.

9. The heat exchange tube of claim 5, wherein, in a direction perpendicular to the panels, an outermost edge of the horizontal blocking portion is flush with the two panels, and an opposite side of the horizontal blocking portion to the fitting portion has an arc-shaped profile in a cross section perpendicular to the first direction.

10. The heat exchange tube of claim 3, wherein, The connecting portion has an elongated shape extending in the second direction.

11. The heat exchange tube of claim 3, wherein, A length of the second fixing portion is greater than a length of the first fixing portion.

12. The heat exchange tube of any one of claims 1-10, wherein, The sealing fixture further comprises an additional first fixing portion and an additional connecting portion connected between the additional first fixing portion and the second fixing portion, the additional first fixing portion and the additional connecting portion have substantially symmetrical structures with the first fixing portion and the connecting portion, and The additional first fixing part and the second fixing part are respectively located on both sides of the at least one side baffle in the second direction, the additional first fixing part abuts against the edges of the two panels in the second direction, and the additional connecting part is located outside the other end of the at least one side baffle in the first direction.

13. The heat exchange tube of any one of claims 1-10, wherein, The sealing fixing part further comprises an additional second fixing part and an additional connecting part connected between the first fixing part and the additional second fixing part, the additional second fixing part and the additional connecting part have a structure substantially symmetrical to the second fixing part and the connecting part, and The first fixing part and the additional second fixing part are respectively located on both sides of the at least one side baffle in the second direction, the additional second fixing part is located between the two panels, and the additional connecting part is located outside the other end of the at least one side baffle in the first direction.

14. The heat exchange tube of any one of claims 1-11, wherein, The interval of the first fixing part and the second fixing part in the second direction is substantially the same as the width of the at least one side baffle in the second direction.

15. The heat exchange tube of any one of claims 1-11, wherein, The connecting part and at least one of the first fixing part and the second fixing part are fixed together by welding or threaded connection.

16. The heat exchange tube of any one of claims 1-11, wherein, The sealing fixing part is bonded together with the panels and the at least one side baffle by an adhesive.

17. The heat exchange tube of any one of claims 1-11, wherein, The panels and the side baffle are made of at least one material of glass, ceramic, graphite, silicon carbide, and the sealing fixing part is made of a metal material.

18. A heat exchanger comprising a shell having an internal space and a plurality of heat exchange tubes supported on the shell and passing through the internal space of the shell, wherein at least one of the heat exchange tubes is the heat exchange tube according to any one of claims 1-17.

19. The heat exchanger of claim 18, wherein, The heat exchanger is a gas-gas heat exchanger for a first gas and a second gas having a lower pressure relative to the first gas, wherein the space between the heat exchange tubes and the shell constitutes a flow passage of the first gas, and the internal passage of the heat exchange tube constitutes a flow passage of the second gas.

20. The heat exchanger of claim 18, wherein, The shell comprises two sealing plates oppositely arranged, a plurality of mounting through holes are respectively formed on the sealing plates, and the two ends of the at least one heat exchange tube are sealingly connected with the mounting through holes through the sealing fixing part.

21. The heat exchanger of claim 19, wherein, The shell comprises two sealing plates oppositely arranged, a plurality of mounting through holes are respectively formed on the sealing plates, and the two ends of the at least one heat exchange tube are sealingly connected with the mounting through holes through the sealing fixing part.

22. A gas heat exchange method using the heat exchanger according to claim 18, comprising: feeding a first gas into the internal space of the shell to flow through between the heat exchange tubes and the shell; and feeding a second gas having a lower pressure relative to the first gas into the heat exchange tubes to flow through from the internal passage of the heat exchange tubes.

23. A heat exchanger comprising a shell having an internal space and a plurality of heat exchange tubes supported on the shell and passing through the internal space of the shell, wherein: ​ The heat exchange tube comprises two panels opposite to each other and two side baffles opposite to each other, the panels and the side baffles enclose to define an internal passage of the heat exchange tube, wherein at least one side baffle is separate from the two panels and is sealingly bonded together, the at least one side baffle has a strip structure extending along a first direction, and has an upper abutting surface and a lower abutting surface for abutting and connecting with the two panels along a direction perpendicular to the panels respectively; and The heat exchanger is a gas-gas heat exchanger for a first gas and a second gas having a lower pressure relative to the first gas, wherein a space between the heat exchange tube and the shell constitutes a flow passage of the first gas, and the internal passage of the heat exchange tube constitutes a flow passage of the second gas.

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