Method for manufacturing a heat exchanger

Abstract

This application discloses a method for manufacturing a heat exchanger, pertaining to the field of heat exchange equipment manufacturing. This method addresses the high cost of coating the surface of heat exchange plates in the prior art. The technical solution to this problem primarily involves a method for manufacturing a heat exchanger, comprising a bracket, a heat exchange plate with a cold-side inlet and outlet, and several side panels with through-holes that mate with the cold-side inlet and outlet of the heat exchange plate. Step S100 involves sealing and welding the cold-side inlet and outlet of the heat exchange plate to the through-holes of the side panels. Step S200 involves coating the outer surface of the heat exchange plate with a wear-resistant and corrosion-resistant layer. Step S300 involves sealing and connecting several side panels from step S200 to the bracket in a forward-backward direction, such that the heat exchange plates are spaced apart within the bracket. This application primarily aims to achieve low-cost coating on the surface of the heat exchange plate.

Description

Technical Field

[0001] The present application relates to the field of heat exchange equipment manufacturing, and in particular to a method for manufacturing a heat exchanger. Background Art

[0002] The existing technology involves the recovery of waste heat from flue gas. Due to the presence of soot and corrosive gases in the flue gas, the surface of the heat exchanger plate is usually coated with a wear-resistant and corrosion-resistant material. Usually, the surface of the heat exchanger plate is coated with an enamel material, which has strong corrosion resistance: the enamel coating has good tolerance to chemicals such as acids, alkalis, and salts. With the exception of a few strong acids such as hydrofluoric acid and hot phosphoric acid, it can remain stable in most chemical media and is not easily corroded. This makes it widely used in industries with high corrosion resistance requirements, such as chemicals, food, and medicine. It can be used to protect equipment and containers from chemical erosion. It has good oxidation resistance: in high temperature and humid environments, the enamel coating can effectively prevent oxygen from contacting the base metal, preventing metal oxidation and rusting, and extending the service life of the equipment. For example, outdoor enamel billboards and architectural decorative enamels can maintain the surface smoothness and color for a long time and are not easily faded or damaged by oxidation.

[0003] However, the existing coating process cannot realize the simultaneous coating of large quantities of heat exchange plates. Since the enamel layer attached to the surface of the heat exchange plate is an inorganic glass material, it is inherently brittle, which makes it easy to crack, peel off, etc. when subjected to mechanical shock, thermal shock or stress. Once damaged, it is difficult to restore the original performance and appearance through simple welding, repairing, etc. like some metal materials. Therefore, the heat exchange plate coated with enamel layer cannot be directly installed in the heat exchanger by welding. First, it is inevitable that the coating will be damaged when welding the heat exchange plate coated with enamel layer on the side plate of the heat exchange plate. Secondly, the heat exchange plate will produce a certain deformation during welding, which will cause a certain stress on the coating on the heat exchange plate, making it easy for the coating to crack and peel off during subsequent use of the heat exchange plate. The commonly used method in some technologies is to weld the heat exchange plates to the side plates of the heat exchanger first, and then coat the heat exchange plates with enamel materials by manual coating. Because the gap between the heat exchange plates after installation is narrow, only one heat exchange plate can be coated at a time. After coating one heat exchange plate, the next plate will be welded and coated. The production cost is extremely high, and the effect of manual coating is also uneven, and the time cost is also large. This makes the cost of heat exchangers with enamel coating on the surface of the heat exchange plates remain high. If all heat exchange plates are to be coated at the same time, the heat exchange plates can only be welded to the side plates of the heat exchanger first, and then the entire set of heat exchange plates and side plates are coated. However, due to the narrow gap between the heat exchange plates after installation, the coating effect is not ideal, and this type of method requires the use of large-scale coating machines to work, and the production cost is extremely high. Summary of the Invention

[0004] In order to overcome the disadvantage of high cost of coating on the surface of heat exchange plates in the prior art, the present application provides a method for manufacturing a heat exchanger, which can achieve low-cost coating on the surface of the heat exchange plates.

[0005] To achieve the above-mentioned objectives, the present application adopts the following technical solution: a method for manufacturing a heat exchanger, the heat exchanger comprising a bracket, a heat exchange plate provided with a cold-side inlet and outlet, and a plurality of side plates with through holes, wherein the through holes are adapted to the cold-side inlet and outlet of the heat exchange plate;

[0006] S100: Sealing and welding the cold side inlet and outlet of the heat exchange plate and the through-holes of the side plate;

[0007] S200: coating the outer surface of the heat exchange plate with a wear-resistant and corrosion-resistant layer;

[0008] S300: Seal and connect several side plates obtained in step S200 to the bracket in sequence along the front-to-back direction, so that the heat exchange plates are spaced apart in the front-to-back direction in the bracket.

[0009] After adopting the above technical solution, the present application has the following advantages: the existing technology is to first weld the heat exchange plate to the side plate of the heat exchanger and then manually plate it, and only one heat exchange plate can be plated at a time, which is costly. However, the present solution first seals and welds the cold side inlet and outlet of the heat exchange plate to the through-hole of the side plate, and then uniformly performs a wear-resistant and corrosion-resistant coating process on the outer surface of the heat exchange plate, and then connects the side plate to the bracket, so that batch plating of multiple heat exchange plates can be achieved, avoiding the high cost problem caused by the existing technology of only being able to plate a single piece, effectively reducing production costs, and the welding connection between the side plates will not affect the coating on the heat exchange plate, nor will it increase the stress on the heat exchange plate. In addition, the present solution first welds and then plates, which can effectively avoid damage to the coating caused by welding, and reduce the stress deformation of the heat exchange plate after plating, ensuring the integrity and stability of the coating, thereby extending the service life of the heat exchange plate.

[0010] Furthermore, in step S200, the side plate includes a body and a wear-resistant and corrosion-resistant layer, and the wear-resistant and corrosion-resistant layer is provided on a side of the body facing the heat exchange plate.

[0011] With the aforementioned technical solution, smoke and corrosive gases present in flue gas can corrode not only the heat exchange plates but also the side panels in contact with them. Coating the side of the side panels facing the heat exchange plates with a wear-resistant and corrosion-resistant layer effectively protects the side panels from long-term exposure to corrosive media like flue gas, thereby extending their service life and ensuring the stability and reliability of the entire heat exchanger equipment.

[0012] Further, in step S200, the main body includes a connecting surface facing adjacent side panels, and two adjacent side panels are connected through the two connecting surfaces.

[0013] Using the aforementioned technical solution, in the subsequent step S300, several side panels are sequentially sealed and connected to the bracket along the front-to-back direction. The connecting surfaces are not coated, ensuring good weldability of the metal surfaces. Coating materials (such as enamel and other wear-resistant and corrosion-resistant materials) are inherently brittle, and some coatings may affect welding quality. Plating on the connecting surfaces can result in a weak weld and cause cracking and flaking of the coating on other areas. Uncoated connecting surfaces avoid these problems, making welding between the side panels and the bracket smoother and more reliable, and ensuring the stability of the entire heat exchanger structure.

[0014] Furthermore, in step S300, the connection surfaces are sealed by welding.

[0015] With the aforementioned technical solution, good sealing performance is crucial for heat exchange equipment to prevent the leakage of internal media such as smoke. Welding can form a continuous, tight connection between the joint surfaces, effectively preventing the leakage of media from the joint. Compared with other connection methods (such as bolted connections, which may require additional sealing measures and have the risk of seal failure), welding provides a more reliable sealing effect, thus ensuring the sealing of heat exchange equipment and improving the safety of equipment operation.

[0016] Furthermore, in step S300, the connection surfaces are sealed by combining a detachable connection component and a sealing strip.

[0017] The detachable connection, using the aforementioned technical solution, allows the side panels to be easily removed when equipment maintenance, repair, or replacement of damaged components (such as heat exchanger plates) is required. Using non-detachable connections like welding can make repairs difficult if internal components develop problems, potentially requiring the entire equipment structure to be destroyed. However, detachable connections allow for quick access to the equipment, making it easier for technicians to inspect and repair internal components, saving repair time and costs and improving the equipment's maintainability.

[0018] Furthermore, it also includes several intermediate plates. In step S300, the side plates are sealed and welded to the bracket through the intermediate plates, and the front and rear adjacent side plates are sealed and welded together through the intermediate plates.

[0019] The addition of the intermediate plate increases the connection area and points between the side plates and the bracket, as well as between adjacent side plates, making the connection between the entire heat exchange plate assembly and the bracket more secure. During operation, the equipment can better withstand external forces such as internal medium pressure and vibration, reducing deformation and loosening caused by uneven force on the connection surface. This improves the strength and stability of the overall structure and extends the equipment's service life.

[0020] Furthermore, in step S300, the cold side fluid enters and exits the cold side inlet and outlet and flows in the left-right direction; the hot side fluid flows from top to bottom in the flue gas channel between two adjacent heat exchange plates.

[0021] With the aforementioned technical solution, the cold-side and hot-side fluids adopt a vertical, cross-flow pattern (left-right flow on the cold side, up-and-down flow on the hot side), allowing the two fluids to fully contact the heat exchange plate surfaces, increasing the area and duration of heat exchange. Compared to parallel flow and other methods, this cross-flow pattern more effectively promotes heat transfer and improves heat exchange efficiency, allowing the cold-side fluid to better absorb the heat carried by the hot-side fluid (such as flue gas), thereby enhancing the performance of the entire heat exchange equipment.

[0022] Furthermore, it also includes a sealing plate, which includes a substrate, a sealing surface for connecting to a bracket and a wear-resistant and corrosion-resistant coating. The wear-resistant and corrosion-resistant layer is provided on the side of the substrate facing the heat exchange plate, and the sealing surface is located on the side facing the bracket. After step S300, there is another step S400: the side of the substrate coated with the wear-resistant and corrosion-resistant coating on the sealing plate is arranged toward the heat exchange plate, and the sealing surface of the sealing plate faces the bracket and is welded and sealed with the bracket through the sealing surface.

[0023] By adopting the aforementioned technical solution, the provision of the sealing plate further enhances the sealing performance of the entire heat exchange equipment. By placing the side of the sealing plate coated with a wear-resistant and corrosion-resistant coating toward the bracket and welding and sealing the sealing surface to the bracket, it is possible to effectively prevent the hot side fluid from leaking from the edge of the equipment, thereby improving the safety and stability of the equipment operation. The provision of the sealing plate and the design of its surface coating and sealing surface are compatible with the treatment process of the heat exchange plate, side plate and other components in the previous steps. Wear-resistant and corrosion-resistant protective measures are adopted for all components of the entire equipment, forming a complete protection system, which enables the equipment to better perform its performance in a complex working environment and improves the applicability and durability of the equipment.

[0024] Furthermore, both ends of the sealing plate extend to cover the outer end surface of the bracket, and the sealing plate and the outer end surface of the bracket are welded and sealed.

[0025] Adopting the aforementioned technical solution, the sealing plate is welded to the front and rear surfaces of the bracket, further strengthening the sealing between the front and rear ends of the equipment. Fluids such as flue gas on the hot side and fluids on the cold side are more tightly confined within the designated space when flowing within the equipment. This effectively prevents fluid leakage from the front and rear ends of the equipment, ensuring stable heat exchange within the enclosed environment and improving the safety and reliability of equipment operation.

[0026] Furthermore, the wear-resistant and corrosion-resistant coating includes one of an enamel coating, a metal-based coating, an electroplated hard chromium coating, a plasma sprayed ceramic coating, a chemical vapor deposition ceramic coating, and an epoxy ceramic coating.

[0027] Using the aforementioned technical solution, the enamel coating applied to the heat exchanger surface offers excellent corrosion resistance, resisting attack by a variety of chemicals, including acids, alkalis, and salts. The smooth surface resists dirt and impurities, offering excellent wear resistance and effectively reducing frictional losses. Its excellent insulation properties prevent electrical failures during operation. Metal-based coatings are formed on metal surfaces using methods such as thermal spraying and electroplating, with a metal matrix enhanced by various alloying elements or ceramic particles. The principle is to leverage the toughness of the metal matrix and the wear and corrosion resistance of the reinforcing phases to enhance the overall performance of the coating. Electroplated hard chromium coatings are hard and shiny coatings formed by depositing chromium metal on metal surfaces through an electroplating process. During the electroplating process, chromium ions receive electrons at the cathode and are reduced to chromium atoms, which gradually accumulate to form the coating. Chromium has high hardness and a low coefficient of friction, enhancing the coating's wear and corrosion resistance. Plasma-sprayed ceramic coatings utilize the high temperatures generated by a plasma arc to melt ceramic powder and spray it at high speed onto the metal surface, forming a ceramic coating. Ceramic materials possess high hardness, high melting points, and excellent chemical stability. Through plasma spraying, they are bonded to metal substrates to provide wear and corrosion resistance. Chemical vapor deposition (CVD) ceramic coatings utilize gaseous substances to undergo chemical reactions at high temperatures, depositing a ceramic coating on the metal surface. By controlling parameters such as the type, concentration, and temperature of the reaction gases, the coating's composition and structure can be precisely controlled, resulting in ceramic coatings with varying properties. Epoxy ceramic coatings are made with an epoxy resin matrix and fillers such as ceramic powder. Epoxy resin offers excellent bonding and corrosion resistance, while ceramic powder enhances the coating's hardness and wear resistance. During the curing process, the epoxy resin and curing agent undergo a cross-linking reaction, forming a three-dimensional network structure that firmly bonds the ceramic powder together, resulting in a wear-resistant and corrosion-resistant coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present application will be further described below with reference to the accompanying drawings:

[0029] Figure 1 A schematic diagram of the heat exchanger for this application;

[0030] Figure 2 It is the left side view of the heat exchanger;

[0031] Figure 3 Schematic diagram of the heat exchanger in Example 2.

[0032] Description of the drawings: 1. Bracket; 2. Heat exchange plate; 21. Cold side inlet and outlet; 3. Side plate; 31. Through hole; 32. Connection surface; 4. Middle plate; 5. Sealing plate; 51. Sealing surface. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0034] In the specification and claims of this application, the terms "first," "second," and so on (if any) are used to distinguish similar items, not to describe a specific order or precedence. Even if "second" is used to distinguish a technical feature, it does not necessarily imply the presence of "first." It should be understood that, in this application, "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. It should be understood that, in this application, "plurality" refers to two or more items. "And / or" simply describes an association between related items, indicating that three possible relationships exist. For example, "X and / or Y" can mean: X exists alone; X and Y exist simultaneously; or Y exists alone. The character " / " generally indicates that the related items are in an "or" relationship. "Including X, Y, and Z" means including all three of X, Y, and Z. "Including X, Y, or Z" means including any one of X, Y, and Z. "Including X, Y, and / or Z" means including any one, any two, or any three of X, Y, and Z.

[0035] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0036] Example 1:

[0037] like Figures 1 to 2 As shown, the present application provides a method for manufacturing a heat exchanger, wherein the heat exchanger includes a bracket 1, a heat exchange plate 2 provided with a cold side inlet and outlet 21, and a plurality of side plates 3 with through holes 31, wherein the through holes 31 are adapted to the cold side inlet and outlet 21 of the heat exchange plate 2;

[0038] S100: Sealing and welding the cold-side inlet and outlet 21 of the heat exchange plate 2 and the through-hole 31 of the side plate 3 together;

[0039] S200: performing a coating process on the outer surface of the heat exchange plate 2 to coat a wear-resistant and corrosion-resistant layer;

[0040] S300: Seal and connect several side panels 3 in step S200 to the bracket 1 in sequence along the front-to-back direction, so that the several heat exchange plates 2 are distributed in the bracket 1 at intervals in the front-to-back direction.

[0041] After adopting the above technical solution, the present application has the following advantages: the existing technology is to first weld the heat exchange plate 2 to the heat exchanger side plate 3 and then manually perform the coating, and only one heat exchange plate 2 can be coated at a time, which is costly. However, the present solution first seals and welds the cold side inlet and outlet 21 of the heat exchange plate 2 to the through hole 31 of the side plate 3, and then uniformly performs a wear-resistant and corrosion-resistant coating process on the outer surface of the heat exchange plate 2, and then connects the side plate 3 to the bracket 1. In this way, batch coating of multiple heat exchange plates 2 can be achieved, avoiding the high cost problem caused by the existing technology of only being able to coat a single piece, effectively reducing production costs, and the welding connection between the side plates 3 will not affect the coating on the heat exchange plate 2, nor will it increase the stress on the heat exchange plate 2. In addition, the present solution first welds and then coats, which can effectively avoid damage to the coating caused by welding and reduce the stress deformation of the heat exchange plate 2 after coating, ensuring the integrity and stability of the coating, thereby extending the service life of the heat exchange plate 2.

[0042] Furthermore, in step S200, the side plate 3 includes a body and a wear-resistant and corrosion-resistant layer, and the wear-resistant and corrosion-resistant layer is provided on a side of the body facing the heat exchange plate.

[0043] With the aforementioned technical solution, smoke and corrosive gases present in the flue gas will not only corrode the heat exchange plates 2, but also the side plates 3 in contact with them. Coating the side of the side plates 3 facing the heat exchange plates 2 with a wear-resistant and corrosion-resistant layer effectively protects the side plates 3, making them less susceptible to corrosion damage from long-term contact with corrosive media such as flue gas. This extends the service life of the side plates 3 and ensures the stability and reliability of the entire heat exchanger equipment.

[0044] Furthermore, in step S200, the main body includes a connecting surface facing adjacent side panels, and two adjacent side panels are connected via the two connecting surfaces.

[0045] Using the aforementioned technical solution, in subsequent step S300, several side panels 3 are sequentially sealed and connected to the bracket 1 along the front-to-back direction. The connection surfaces 32 are not coated, ensuring good weldability of the metal surface. Because wear-resistant coating materials (such as enamel and other wear-resistant and corrosion-resistant materials) are inherently brittle, and some coatings may affect welding quality, coating the connection surfaces 32 can result in a weak weld and potentially crack or peel the coating on other parts of the connection surface. Uncoated connection surfaces 32 avoid these problems, making welding between the side panels 3 and the bracket 1 smoother and more reliable, and ensuring the stability of the entire heat exchanger structure.

[0046] Furthermore, in step S300, the connection surfaces 32 are sealed and connected by welding.

[0047] With the aforementioned technical solution, good sealing performance is crucial for heat exchange equipment to prevent leakage of internal media such as flue gas. Welding can form a continuous, tight connection between the connection surfaces 32, effectively preventing the media from leaking through the connection surfaces 32. Compared with other connection methods (such as bolted connections, which may require additional sealing measures and have the risk of seal failure), welding provides a more reliable sealing effect, thereby ensuring the sealing of the heat exchange equipment and improving the safety of its operation.

[0048] In step S300 of another embodiment, the connection surfaces 32 are sealed and connected by a combination of a detachable connection component and a sealing strip.

[0049] The detachable connection of the aforementioned technical solution allows the side panels 3 to be easily disassembled when equipment maintenance, repair, or replacement of damaged components (such as the heat exchanger plate 2) is required. If non-detachable connections such as welding are used, repairs to internal components would be difficult and might even require destruction of the entire equipment structure. However, detachable connections allow for quick opening of the equipment, facilitating internal inspection and repair by technicians, saving repair time and costs and improving the equipment's maintainability.

[0050] Specifically, the detachable connection includes a bolt connection and a snap connection.

[0051] Furthermore, in step S300 , the cold side fluid enters and exits the cold side inlet and outlet 21 and flows in the left-right direction; the hot side fluid flows from top to bottom in the flue gas channel between two adjacent heat exchange plates 2 .

[0052] With the aforementioned technical solution, the cold-side and hot-side fluids adopt a vertically intersecting flow pattern (left-right flow on the cold side, up-and-down flow on the hot side), allowing the two fluids to fully contact the surface of the heat exchange plate 2, increasing the area and duration of heat exchange. Compared to parallel flow and other methods, this cross-flow pattern more effectively promotes heat transfer and improves heat exchange efficiency, allowing the cold-side fluid to better absorb the heat carried by the hot-side fluid (such as flue gas), thereby enhancing the performance of the entire heat exchange device.

[0053] Specifically, the upper and lower openings of the bracket 1 are directly connected to the flue, so that the flue gas directly passes through the heat exchange plate 2 for heat exchange.

[0054] Furthermore, it also includes a sealing plate 5, which includes a substrate, a sealing surface 51 for connecting to the bracket and a wear-resistant and corrosion-resistant coating. The wear-resistant and corrosion-resistant layer is provided on the side of the substrate facing the heat exchange plate 2, and the sealing surface 51 is located on the side facing the bracket 1. After step S300, there is another step S400: the side of the substrate coated with the wear-resistant and corrosion-resistant coating on the sealing plate 5 is set toward the heat exchange plate 2, and the sealing surface 51 of the sealing plate 5 faces the bracket 1 and is welded and sealed with the bracket 1 through the sealing surface 51.

[0055] By adopting the above-mentioned technical solution, the provision of the sealing plate 5 further strengthens the sealing performance of the entire heat exchange equipment. By facing the side of the sealing plate 5 coated with a wear-resistant and corrosion-resistant coating toward the bracket 1, and using the sealing surface 51 to weld and seal with the bracket 1, it is possible to effectively prevent the hot side fluid from leaking from the edge of the equipment, thereby improving the safety and stability of the equipment operation. The provision of the sealing plate 5 and the design of its surface coating and the sealing surface 51 are compatible with the treatment process of the heat exchange plate 2, side plate 3 and other components in the previous steps. Wear-resistant and corrosion-resistant protective measures are adopted for each component of the entire equipment, forming a complete protection system, which enables the equipment to better perform its performance in a complex working environment and improves the applicability and durability of the equipment.

[0056] Furthermore, both ends of the sealing plate 5 extend to cover the outer end surface of the bracket 1 , and the sealing plate 5 and the outer end surface of the bracket 1 are welded and sealed.

[0057] Adopting the aforementioned technical solution, sealing plate 5 is welded to the front and rear surfaces of bracket 1, further strengthening the seal between the front and rear ends of the heat exchanger. This allows the hot-side flue gas and cold-side fluid to flow more tightly within the designated spaces within the device, effectively preventing fluid leakage from the front and rear ends of the heat exchanger. This ensures stable heat exchange within the enclosed environment and improves the safety and reliability of the device's operation.

[0058] Furthermore, the wear-resistant and corrosion-resistant coating includes one of an enamel coating, a metal-based coating, an electroplated hard chromium coating, a plasma sprayed ceramic coating, a chemical vapor deposition ceramic coating, and an epoxy ceramic coating.

[0059] Using the aforementioned technical solution, the enamel coating applied to the heat exchanger surface offers excellent corrosion resistance, resisting attack by a variety of chemicals, including acids, alkalis, and salts. The smooth surface resists dirt and impurities, offering excellent wear resistance and effectively reducing frictional losses. Its excellent insulation properties prevent electrical failures during operation. Metal-based coatings are formed on metal surfaces using methods such as thermal spraying and electroplating, with a metal matrix enhanced by various alloying elements or ceramic particles. The principle is to leverage the toughness of the metal matrix and the wear and corrosion resistance of the reinforcing phases to enhance the overall performance of the coating. Electroplated hard chromium coatings are hard and shiny coatings formed by depositing chromium metal on metal surfaces through an electroplating process. During the electroplating process, chromium ions receive electrons at the cathode and are reduced to chromium atoms, which gradually accumulate to form the coating. Chromium has high hardness and a low coefficient of friction, enhancing the coating's wear and corrosion resistance. Plasma-sprayed ceramic coatings utilize the high temperatures generated by a plasma arc to melt ceramic powder and spray it at high speed onto the metal surface, forming a ceramic coating. Ceramic materials possess high hardness, high melting points, and excellent chemical stability. Through plasma spraying, they are bonded to metal substrates to provide wear and corrosion resistance. Chemical vapor deposition (CVD) ceramic coatings utilize gaseous substances to undergo chemical reactions at high temperatures, depositing a ceramic coating on the metal surface. By controlling parameters such as the type, concentration, and temperature of the reaction gases, the coating's composition and structure can be precisely controlled, resulting in ceramic coatings with varying properties. Epoxy ceramic coatings are made with an epoxy resin matrix and fillers such as ceramic powder. Epoxy resin offers excellent bonding and corrosion resistance, while ceramic powder enhances the coating's hardness and wear resistance. During the curing process, the epoxy resin and curing agent undergo a cross-linking reaction, forming a three-dimensional network structure that firmly bonds the ceramic powder together, resulting in a wear-resistant and corrosion-resistant coating.

[0060] Example 2:

[0061] like Figure 3 As shown, several intermediate plates 4 are also included. In step S300 , the side plates 3 are sealed and welded to the bracket 1 through the intermediate plates 4 , and the front and rear adjacent side plates 3 are sealed and welded together through the intermediate plates 4 .

[0062] With the aforementioned technical solution, the addition of the middle plate 4 increases the connection area and number of connection points between the side plates 3 and the bracket 1, as well as between adjacent side plates 3, making the connection between the entire heat exchange plate 2 assembly and the bracket 1 more secure. During operation, the equipment can better withstand external forces such as internal medium pressure and vibration, reducing deformation and loosening caused by uneven force on the connection surface 32, thereby improving the strength and stability of the overall structure of the equipment and extending its service life.

[0063] Specifically, the middle block includes a middle block with a T-shaped cross section and a middle block with a sheet-shaped cross section for covering the connection between two side blocks.

[0064] In addition to the above-mentioned preferred embodiments, the present application also has other implementation methods. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present application.

Claims

1. A method for manufacturing a heat exchanger, characterized in that: The heat exchanger includes a bracket, a heat exchange plate with a cold side inlet and outlet, and a plurality of side plates with through holes, wherein the through holes are adapted to the cold side inlet and outlet of the heat exchange plate; S100: Sealing and welding the cold side inlet and outlet of the heat exchange plate and the through-holes of the side plate; S200: performing a coating process for a wear-resistant and corrosion-resistant layer on the outer surface of the heat exchange plate; in step S200, the side plate includes a body and a wear-resistant and corrosion-resistant layer, the wear-resistant and corrosion-resistant coating includes an enamel coating; the wear-resistant and corrosion-resistant layer is provided on a side of the body facing the heat exchange plate; S300: Sequentially and sealably attaching the plurality of side plates from step S200 to the bracket in the front-to-back direction, so that the plurality of heat exchange plates are spaced apart in the front-to-back direction within the bracket. The process also includes a plurality of intermediate plates. In step S300, the side plates are sealably welded to the bracket via the intermediate plates, and the front and rear adjacent side plates are sealably welded together via the intermediate plates. It also includes a sealing plate, which includes a substrate, a sealing surface for connecting to a bracket and a wear-resistant and corrosion-resistant coating. The wear-resistant and corrosion-resistant layer is provided on the side of the substrate facing the heat exchange plate, and the sealing surface is located on the side facing the bracket. After step S300, there is another step S400: the substrate side coated with the wear-resistant and corrosion-resistant coating on the sealing plate is arranged toward the heat exchange plate, the sealing surface of the sealing plate faces the bracket and is welded and sealed with the bracket through the sealing surface; both ends of the sealing plate extend and cover the outer end surface of the bracket, and the sealing plate and the outer end surface of the bracket are welded and sealed.

2. The method for manufacturing a heat exchanger according to claim 1, characterized in that: In step S200, the body includes a connecting surface facing adjacent side panels, and two adjacent side panels are connected via the two connecting surfaces.

3. The method for manufacturing a heat exchanger according to claim 2, characterized in that: In step S300, two adjacent connection surfaces are sealed and connected by welding.

4. The method for manufacturing a heat exchanger according to claim 2, characterized in that: In step S300, two adjacent connection surfaces are sealed and connected by combining a detachable connection component and a sealing strip.

5. The method for manufacturing a heat exchanger according to claim 1, characterized in that: In step S300, the cold side fluid enters and exits the cold side inlet and outlet and flows in the left-right direction; the hot side fluid flows from top to bottom in the flue gas channel between two adjacent heat exchange plates.

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