Wear-resistant and corrosion-resistant heat pipe heat exchanger, preparation method thereof and low-low-temperature economizer

Abstract

The invention discloses a wear-resistant and corrosion-resistant heat pipe heat exchanger and a preparation method thereof and a low-low-temperature economizer, and relates to the technical field of heat pipe heat exchangers. The preparation method comprises the steps that PPS plastic powder is heated to be in a molten state to form an anti-corrosion solution, and a cleaned and derusted heat pipe is immersed in the anti-corrosion solution to form a heat pipe; the surface of the heat pipe is fully wrapped by the anti-corrosion solution; the heat pipe subjected to soaking treatment is placed in forced air drying equipment to be baked and plasticized, the forced air drying equipment blows mixed powder containing aluminum oxide and silicon dioxide to the heat pipe subjected to soaking treatment through a built-in powder supply device, and the mixed powder is flushed and attached to the coating, in the plasticized state, on the surface of the heat pipe; and cooling the baked and plasticized heat pipe to form a composite reinforced coating on the surface of the heat pipe. Through the heat pipe heat exchanger, the technical effects of improving the wear resistance and corrosion resistance of the heat pipe heat exchanger and maintaining good heat exchange performance can be achieved.

Description

Technical Field

[0001] This application relates to the field of heat pipe heat exchanger technology, and in particular to a wear-resistant and corrosion-resistant heat pipe heat exchanger, its preparation method, and a low-temperature economizer. Background Technology

[0002] In heat pipe heat exchanger applications, the heat exchange tubes of traditional low-temperature economizers are constantly subjected to the continuous scouring of high-concentration dust in flue gas, making them prone to wear. Simultaneously, acidic gases in the flue gas can corrode the heat exchange tubes, leading to perforation failures in tubes exposed to this environment for extended periods. Once a heat exchange tube perforates, cooling water leaks into the flue gas side, causing moisture to mix with flue gas dust and deposit and caking at the bottom of the flue. The entire heat exchange tube loses its heat exchange capacity, requiring shutdown and isolation of the entire heat exchange module to prevent further damage, severely impacting unit reliability. While existing technologies employ anti-wear measures such as anti-wear dummy tubes, anti-wear coatings, airflow optimization, and anti-wear tiles / angle steel, these methods still suffer from drawbacks. Anti-wear dummy tubes cannot completely prevent heat exchange tube wear; coatings are prone to peeling and failure; airflow optimization offers limited anti-wear effects; and anti-wear angle steel and tiles only delay wear and may reduce heat exchange efficiency. These limitations make it difficult to simultaneously meet the requirements for wear and corrosion resistance of heat exchange tubes and maintain good heat exchange performance. Summary of the Invention

[0003] This application provides a wear-resistant and corrosion-resistant heat pipe heat exchanger, its preparation method, and a low-temperature economizer. It can solve the problems in related technologies such as insufficient wear and corrosion resistance of heat exchange tubes, limited effectiveness or easy failure of existing anti-wear measures, and potential reduction in heat exchange efficiency.

[0004] According to a first aspect of this application, a method for manufacturing a wear-resistant and corrosion-resistant heat pipe heat exchanger is provided, comprising: PPS plastic powder is heated to a molten state to form an anti-corrosion solution, and the cleaned and rust-removed heat pipe is immersed in the anti-corrosion solution so that the surface of the heat pipe is fully coated with the anti-corrosion solution. The heat pipe after soaking is placed in a blower drying equipment for baking and plasticizing. The blower drying equipment blows a mixed powder containing alumina and silicon dioxide onto the heat pipe after soaking through a built-in powder supply device, so that the mixed powder washes over and adheres to the coating on the surface of the heat pipe in a plasticized state. The heat pipe, after being baked and plasticized, is cooled to form a composite reinforced coating on its surface.

[0005] According to a second aspect of this application, a wear-resistant and corrosion-resistant heat pipe heat exchanger is provided, which is prepared according to the preparation method of the wear-resistant and corrosion-resistant heat pipe heat exchanger of the first aspect described above.

[0006] According to a third aspect of this application, a low-temperature economizer is provided, the low-temperature economizer comprising at least one wear-resistant and corrosion-resistant heat pipe heat exchanger as described in the second aspect above.

[0007] By using this application, PPS plastic powder is heated and melted to form an anti-corrosion solution that coats the cleaned heat pipe. Then, during baking and plasticizing, a composite reinforced coating is formed by the adhesion of a mixture of alumina and silica powder. Therefore, the problems of insufficient wear and corrosion resistance of heat exchange tubes, limited effectiveness or easy failure of existing anti-wear measures, and potential reduction of heat exchange efficiency in related technologies can be solved. This achieves the technical effect of improving the wear and corrosion resistance of heat pipe heat exchangers and maintaining good heat exchange performance.

[0008] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0009] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic flowchart illustrating a method for preparing a wear-resistant and corrosion-resistant heat pipe heat exchanger according to an embodiment of this application.

[0011] Figure 2 This is a schematic flowchart illustrating a method for preparing a wear-resistant and corrosion-resistant heat pipe heat exchanger according to an embodiment of this application. Detailed Implementation

[0012] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of this application, including various details to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0013] The following description, with reference to the accompanying drawings, describes a wear-resistant and corrosion-resistant heat pipe heat exchanger, its preparation method, and a low-temperature economizer according to embodiments of this application.

[0014] Figure 1 This is a schematic flowchart illustrating a method for preparing a wear-resistant and corrosion-resistant heat pipe heat exchanger according to an embodiment of this application.

[0015] like Figure 1As shown, the method includes the following steps: Step 101: Heat PPS plastic powder to a molten state to form an anti-corrosion solution, and immerse the cleaned and derusted heat pipe in the anti-corrosion solution so that the surface of the heat pipe is fully coated with the anti-corrosion solution.

[0016] In some embodiments, high-purity PPS plastic powder is first selected as the core raw material. PPS plastic, or polyphenylene sulfide, is a polymer material with excellent corrosion resistance, high temperature resistance, and mechanical stability. Its chemical structure is stable and can resist the erosion of various acidic gases and chemical media, making it very suitable as a base material for corrosion protection on the surface of heat pipes. In the heating equipment, the PPS plastic powder is subjected to a gradient heating process, gradually heated to a molten state. During this process, the heating rate and temperature stability are strictly controlled to ensure that the PPS plastic powder is completely melted and does not undergo thermal decomposition, ultimately forming a uniform, moderately viscous anti-corrosion solution. This solution can adhere tightly to the solid surface, laying the foundation for the subsequent formation of a continuous and complete coating.

[0017] Simultaneously, a comprehensive cleaning and rust removal pretreatment is performed on the heat pipes to remove oxide scale, rust, oil, and other impurities from their surface. This pretreatment step is crucial, effectively preventing impurities from affecting the adhesion between the anti-corrosion solution and the heat pipe surface, ensuring a stable coating adhesion. After pretreatment, the clean, dry heat pipes are slowly immersed in the prepared anti-corrosion solution. During immersion, air bubbles that may form on the heat pipe surface can be eliminated by gently shaking or rotating the heat pipe, ensuring that the anti-corrosion solution evenly covers every surface of the heat pipe, including critical areas such as the pipe body and pipe edges. This ensures the heat pipe surface is fully coated with the anti-corrosion solution, forming an initial anti-corrosion base layer, preparing for further enhancement of coating performance.

[0018] This step utilizes the excellent corrosion resistance and post-melting adhesion properties of PPS plastic to initially construct an anti-corrosion protection system for the heat pipe, effectively isolating the heat pipe body from the erosion of acidic gases in the flue gas. At the same time, it provides a good substrate for the subsequent formation of composite coatings, improves the stability of the overall protective structure, and extends the service life of the heat pipe.

[0019] Step 102: The heat pipe after soaking treatment is placed in a blower drying equipment for baking and plasticizing. The blower drying equipment blows a mixed powder containing alumina and silicon dioxide onto the heat pipe after soaking treatment through a built-in powder supply device, so that the mixed powder washes over and adheres to the coating on the surface of the heat pipe in a plasticized state.

[0020] In some embodiments, the heat pipes, after being immersed in the anti-corrosion solution, are smoothly placed inside the forced-air drying equipment, ensuring that the heat pipes are positioned correctly within the equipment to avoid uneven coating adhesion due to contact with the inner wall of the equipment or stacking. After the forced-air drying equipment is started, the internal temperature is precisely controlled to a suitable range that allows the anti-corrosion solution on the surface of the heat pipe to plasticize. The stable temperature environment promotes the gradual softening and plasticization of the PPS plastic coating, at which point the coating has good adhesion and ductility, creating favorable conditions for the subsequent adhesion of mixed powders.

[0021] The built-in powder supply device of the blower-drying equipment starts synchronously. The mixed powder stored in this device is composed of alumina and silica in a specific ratio. Alumina has excellent hardness and thermal conductivity, which can significantly improve the wear resistance and thermal conductivity of the coating, while silica particles are small in size, which can enhance the structural density and tear resistance of the coating. The powder supply device blows the mixed powder into the equipment through uniform air supply. The airflow carries the powder to form a stable scouring airflow, which continuously acts on the surface coating of the heat pipe in a plasticized state. Under the scouring force of the airflow and the adhesiveness of the coating itself, the alumina and silica particles in the mixed powder adhere tightly to the coating surface and surface structure, forming a firm bond with the plasticized PPS coating, which will not easily fall off.

[0022] This step organically combines a wear-resistant mixed powder with a plasticized coating to further build a wear-resistant reinforcement layer on the anti-corrosion substrate, effectively improving the overall mechanical strength and erosion resistance of the coating. This provides a reliable guarantee for the heat pipe to resist the continuous erosion of high-concentration dust in flue gas. At the same time, the thermal conductivity of alumina ensures that the heat exchange performance of the heat pipe is not significantly affected.

[0023] Step 103: Cool the heat pipe after baking and plasticizing to form a composite reinforced coating on the surface of the heat pipe.

[0024] In some embodiments, after baking, plasticizing, and powder coating treatment, the heat pipe is subjected to scientific and reasonable cooling. During the cooling process, it is necessary to avoid sudden temperature drops that could cause cracks or peeling of the coating due to uneven thermal expansion and contraction. A combination of natural cooling and gradient cooling can be used to allow the heat pipe to cool down slowly in a clean and dry environment, ensuring that the heat pipe body and the plasticized coating and powder particles on the surface shrink synchronously to form a structurally stable whole.

[0025] During the cooling process, the PPS anti-corrosion coating, initially in a plasticized state, gradually solidifies, transforming from a viscous state into a dense and hard solid film that firmly adheres to the heat pipe surface. The alumina and silica particles previously attached to the coating are then firmly locked within the coating structure as it solidifies, preventing peeling. Ultimately, a composite reinforced coating is formed on the heat pipe surface, consisting of a PPS anti-corrosion substrate and alumina and silica wear-resistant particles. This coating combines the corrosion resistance of PPS with the wear resistance of both inorganic particles, exhibiting a continuous and dense structure that comprehensively covers the heat pipe surface.

[0026] This step achieves the final formation of the composite reinforced coating through precise cooling treatment, enabling the coating to form a stable bond with the heat pipe body. This not only ensures the structural integrity of the coating but also fully leverages the performance advantages of each component. The resulting composite reinforced coating can effectively resist dust erosion and acid gas corrosion while maintaining good heat exchange efficiency of the heat pipe, significantly extending the service life of the heat pipe heat exchanger and reducing equipment maintenance costs.

[0027] Compared with related technologies, in this embodiment, PPS plastic powder is heated to a molten state to form an anti-corrosion solution. The cleaned and derusted heat pipe is then immersed in this solution, ensuring the surface of the heat pipe is fully coated. The immersed heat pipe is then placed in a forced-air drying device for baking and plasticizing. This device uses a built-in powder supply device to blow a mixed powder containing alumina and silica onto the heat pipe, causing the powder to wash over and adhere to the plasticized coating on the heat pipe surface. The baked and plasticized heat pipe is then cooled to form a composite reinforced coating on its surface. This method solves the problems of insufficient wear and corrosion resistance of heat exchange tubes in related technologies, limited effectiveness or easy failure of existing anti-wear measures, and potential reduction in heat exchange efficiency. It achieves the technical effect of improving the wear and corrosion resistance of heat pipe heat exchangers and maintaining good heat exchange performance.

[0028] In step 101, optionally, the heating temperature of the PPS plastic powder is 290°C to 350°C, preferably 330°C, and it is maintained in a molten state for 1 hour to form the anti-corrosion solution.

[0029] In step 101, precise control of the heating temperature of the PPS plastic powder is crucial to ensuring the stability of the anti-corrosion solution. Considering the physicochemical properties of PPS plastic, the heating temperature needs to be controlled within a reasonable range of 290℃ to 350℃. This temperature range ensures that the PPS plastic powder melts completely, forming a uniform and continuous solution, while preventing thermal degradation due to excessively high temperatures, which would damage its excellent corrosion resistance and structural stability. Simultaneously, it prevents insufficient melting due to excessively low temperatures, leading to solution clumping and uneven viscosity, thus affecting the adhesion of subsequent coatings.

[0030] Within this temperature range, 330℃ was determined to be the preferred heating temperature. At this temperature, the PPS plastic powder melts more efficiently, and the resulting anti-corrosion solution has the perfect viscosity. This ensures a uniform coating thickness on the heat pipe surface while maintaining a tight adhesion between the coating and the heat pipe surface. The solution is neither too thin, resulting in insufficient protection, nor too thick, causing uneven coating or air bubbles. Furthermore, after heating to the molten state, this state must be maintained for one hour. This sufficient holding time allows the molecules within the PPS plastic powder to fully fuse and distribute evenly, further enhancing the stability and consistency of the anti-corrosion solution. This ensures that the subsequently immersed heat pipe surface is uniformly coated with the solution, laying a solid foundation for the overall anti-corrosion performance of the composite reinforced coating.

[0031] The optimized parameter settings make the preparation of the anti-corrosion solution more targeted and reliable, effectively improving the initial adhesion quality and basic anti-corrosion performance of the coating, providing a stable guarantee for the adhesion of wear-resistant particles and the formation of composite coatings in subsequent steps, thereby enhancing the overall protective effect of the heat pipe and extending its service life under harsh working conditions.

[0032] In step 102, optionally, the blower drying equipment is a horizontal electric heating blower drying box with its air outlet located at the bottom and the wind speed adjustable from 1.5m / s to 3.0m / s, and adopts an internal circulation mode.

[0033] The drying equipment uses a horizontal electric heating drying oven. This structural design provides a uniform baking environment for the heat pipes, ensuring consistent heating across all parts and preventing incomplete or excessive plasticization in certain areas. The air outlet is located at the bottom, and with the internal circulation mode, a stable airflow loop is formed within the oven. Hot air diffuses evenly upwards from the bottom, covering the entire surface of the heat pipes, making the plasticization process more stable and efficient. Simultaneously, the air velocity can be flexibly adjusted between 1.5 m / s and 3.0 m / s. Operators can select the appropriate air velocity based on the heat pipe specifications, coating thickness, and other factors. This ensures sufficient airflow to wash the mixed powder across the heat pipe surface while avoiding excessive airflow that could damage the coating during plasticization, or insufficient airflow that could cause uneven powder adhesion, further improving the coating forming quality. The selection of this equipment and its parameters provides a stable environment for baking, plasticization, and mixed powder adhesion, ensuring the uniformity and adhesion of the composite coating.

[0034] Optionally, the powder feeding device is a porous plate, on which the mixed powder is placed; the alumina has a particle size of 0.4 μm to 0.8 μm, and the silicon dioxide has a particle size of 20 nm.

[0035] The powder supply device in step 102 uses a perforated plate. The mixed powder is placed directly on the perforated plate. The perforated plate's structural design allows airflow to pass evenly through the plate, smoothly blowing the mixed powder into the equipment, avoiding powder accumulation or uneven dispersion. The alumina particle size is controlled between 0.4μm and 0.8μm. Alumina particles in this size range have sufficient hardness to improve the coating's wear resistance and can smoothly adhere to the plasticized coating surface, preventing poor adhesion or scratches due to excessively large particles. The silica particle size is 20nm. This size allows it to fill the coating gaps more tightly, forming a complementary structure with the alumina particles, further enhancing the coating's density. This mixed powder with the appropriate particle size adheres more evenly to the heat pipe surface under airflow, significantly improving the coating's wear resistance and structural stability, allowing the heat pipe to better resist dust erosion.

[0036] Optionally, in the mixed powder, the amount of alumina is 90 grams per kilogram of heat pipe substrate, and the amount of silicon dioxide is 20 grams per kilogram of heat pipe substrate.

[0037] In the mixed powder formulation, the amount of alumina is set at 90 grams per kilogram of heat pipe substrate, and the amount of silica is 20 grams per kilogram of heat pipe substrate. This ratio is determined based on the performance characteristics and synergistic effects of the two powders. Alumina, as the main wear-resistant reinforcing component, ensures sufficient hardness and erosion resistance in the coating when used in appropriate amounts. Silica, as an auxiliary reinforcing component, improves the tear strength and density of the coating without affecting its thermal conductivity. The optimized ratio of the two powders fully leverages their respective performance advantages while avoiding performance imbalances caused by excessive amounts of any single component. For example, too much alumina may affect the adhesion between the coating and the heat pipe, while too much silica may reduce the coating's thermal conductivity. Precise dosage control allows the mixed powder and the plasticized coating to achieve optimal synergy, further enhancing the overall performance of the composite coating and ensuring the stability of the heat pipe during use.

[0038] Optionally, the baking and plasticizing temperature is 280°C.

[0039] The baking and plasticizing temperature was set at 280℃, a temperature precisely determined based on the plasticizing characteristics of PPS plastic. This temperature ensures that the PPS anti-corrosion solution on the heat pipe surface fully softens and enters a plasticized state, giving it good adhesion and ductility for strong adhesion of the mixed powder. It also avoids the problems of excessively high temperatures leading to PPS material performance degradation, or excessively low temperatures causing insufficient plasticization and poor coating adhesion. At this temperature, the plasticizing process proceeds smoothly; the coating will not flow or deform due to over-softening, nor will insufficient plasticization affect its bonding with the mixed powder. This ensures that the mixed powder is tightly embedded in the plasticized coating, forming a structurally robust composite layer. A stable plasticizing temperature provides crucial support for the subsequent formation of the composite coating, helping to improve the coating's strength and consistency, thereby enhancing the heat pipe's wear and corrosion resistance.

[0040] Figure 2 A schematic flowchart illustrating another method for preparing a wear-resistant and corrosion-resistant heat pipe heat exchanger provided in this application embodiment includes the following steps: Step 201: Clean and remove rust from the surface of the heat pipe substrate using a 30% oxalic acid solution.

[0041] In some embodiments, before carrying out the core step of preparing the composite reinforcement coating on the heat pipe surface, a targeted pretreatment of the heat pipe substrate surface is required in step 201, namely, cleaning and rust removal using a 30% oxalic acid solution. Oxalic acid, as a mild and efficient organic acid, has good rust and oxide scale removal capabilities. Its 30% concentration is optimized to ensure effective dissolution and removal of rust and oxide layers on the heat pipe surface without causing excessive corrosion to the heat pipe substrate due to excessive concentration, thus avoiding damage to the heat pipe structure.

[0042] During the treatment, the heat pipe substrate to be processed is completely immersed in a prepared 30% oxalic acid solution. The oxalic acid reacts chemically with rust and oxide scale, thoroughly decomposing and removing stubborn rust, oxidation impurities, and contaminants such as oil stains generated during production and storage from the heat pipe surface. The treatment time can be adjusted according to the degree of rust on the heat pipe surface to ensure that every part of the substrate surface is thoroughly cleaned, ultimately exposing a clean and smooth metal surface.

[0043] This pretreatment step creates crucial conditions for the subsequent adhesion of the anti-corrosion solution. A clean substrate surface significantly enhances the bonding force between the PPS anti-corrosion solution and the heat pipe, preventing defects such as coating peeling and blistering caused by surface impurities. Simultaneously, removing the oxide layer and rust stabilizes the metallic properties of the heat pipe substrate, reducing the potential for corrosion during subsequent use. This lays a solid foundation for the protective effect of the entire composite reinforced coating, indirectly extending the overall service life of the heat pipe and ensuring the stable operation of the heat exchange system.

[0044] Step 202: Heat the PPS plastic powder to a molten state to form an anti-corrosion solution, and immerse the cleaned and derusted heat pipe in the anti-corrosion solution so that the surface of the heat pipe is fully coated with the anti-corrosion solution.

[0045] Step 203: The heat pipe after soaking treatment is placed in a blower drying equipment for baking and plasticizing. The blower drying equipment blows a mixed powder containing alumina and silicon dioxide onto the heat pipe after soaking treatment through a built-in powder supply device, so that the mixed powder washes over and adheres to the coating on the surface of the heat pipe in a plasticized state.

[0046] Step 204: Cool the heat pipe after baking and plasticizing to form a composite reinforced coating on the surface of the heat pipe.

[0047] For a description of steps 202-204, please refer to the description of steps 101-103 in the above embodiment. This embodiment will not repeat the details further.

[0048] Step 205: The coating strength, wear resistance, thermal conductivity, and corrosion resistance of the heat pipe are tested using an adhesive strength tester, a sand drop test, a thermal conductivity tester, and a simulated acidic environment.

[0049] In some embodiments, during the testing process, multiple professional methods are employed to test key performance indicators: An adhesive strength tester is used to quantitatively test the bonding strength between the coating and the heat pipe substrate. By precisely applying tensile or shear forces, the risk of coating detachment is assessed, ensuring that it will not separate from the substrate due to airflow erosion, temperature changes, or other factors during long-term use; the abrasion resistance of the coating is tested using the sand drop method, where sand particles of a specific size continuously impact the coating surface at a specified height and flow rate. By measuring the amount of sand particles consumed per unit thickness of coating wear, its ability to resist dust erosion is evaluated; the thermal conductivity tester is used to test the thermal conductivity of the heat pipe, ensuring that the presence of the composite coating does not significantly affect the heat exchange efficiency of the heat pipe, guaranteeing that the core function of the heat exchanger remains undisturbed; simultaneously, a corrosion resistance test is conducted in a simulated acidic environment. The heat pipe is placed in a simulated acidic gas corrosive environment in flue gas, and the state changes of the coating are continuously observed over a specific time period to verify its resistance to acidic media. The test results are shown in Table 1.

[0050] These multi-dimensional testing methods can comprehensively verify the overall performance of the composite reinforced coating, promptly identify potential quality problems, and ensure that the heat pipe heat exchangers leaving the factory meet the actual operating conditions in terms of wear resistance, corrosion resistance, thermal conductivity, and structural stability. This provides a reliable guarantee for the long-term stable operation of the unit and also provides data support for subsequent product performance optimization.

[0051] This application also provides a wear-resistant and corrosion-resistant heat pipe heat exchanger, which is prepared according to the preparation method of the wear-resistant and corrosion-resistant heat pipe heat exchanger in the above embodiments.

[0052] This application also provides a low-temperature economizer, which includes at least one wear-resistant and corrosion-resistant heat pipe heat exchanger as described in the above embodiments.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0054] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for preparing a wear-resistant and corrosion-resistant heat pipe heat exchanger, characterized in that, include: PPS plastic powder is heated to a molten state to form an anti-corrosion solution, and the cleaned and rust-removed heat pipe is immersed in the anti-corrosion solution so that the surface of the heat pipe is fully coated with the anti-corrosion solution. The heat pipe after soaking is placed in a blower drying equipment for baking and plasticizing. The blower drying equipment blows a mixed powder containing alumina and silicon dioxide onto the heat pipe after soaking through a built-in powder supply device, so that the mixed powder washes over and adheres to the coating on the surface of the heat pipe in a plasticized state. The heat pipe, after being baked and plasticized, is cooled to form a composite reinforced coating on its surface.

2. The method for preparing the wear-resistant and corrosion-resistant heat pipe heat exchanger according to claim 1, characterized in that, The PPS plastic powder is heated to a temperature of 290°C to 350°C, preferably 330°C, and maintained in a molten state for 1 hour to form the anti-corrosion solution.

3. The method for preparing the wear-resistant and corrosion-resistant heat pipe heat exchanger according to claim 1, characterized in that, The blower drying equipment is a horizontal electric heating blower drying box with its air outlet located at the bottom. The wind speed is adjustable from 1.5m / s to 3.0m / s and adopts an internal circulation mode.

4. The method for preparing the wear-resistant and corrosion-resistant heat pipe heat exchanger according to claim 1, characterized in that, The powder supply device is a porous plate, on which the mixed powder is placed; the alumina has a particle size of 0.4 μm to 0.8 μm, and the silicon dioxide has a particle size of 20 nm.

5. The method for preparing the wear-resistant and corrosion-resistant heat pipe heat exchanger according to claim 1, characterized in that, In the mixed powder, the amount of alumina is 90 grams per kilogram of heat pipe substrate, and the amount of silicon dioxide is 20 grams per kilogram of heat pipe substrate.

6. The method for preparing the wear-resistant and corrosion-resistant heat pipe heat exchanger according to claim 1, characterized in that, The baking and plasticizing temperature is 280°C.

7. The method for preparing the wear-resistant and corrosion-resistant heat pipe heat exchanger according to claim 1, characterized in that, Also includes: The heat pipe substrate surface was cleaned and rust removed using a 30% oxalic acid solution.

8. The method for preparing the wear-resistant and corrosion-resistant heat pipe heat exchanger according to claim 1, characterized in that, Also includes: The coating strength, wear resistance, thermal conductivity, and corrosion resistance of the heat pipe were tested using a bonding strength tester, a sand drop test, a thermal conductivity tester, and a simulated acidic environment.

9. A wear-resistant and corrosion-resistant heat pipe heat exchanger, characterized in that, The wear-resistant and corrosion-resistant heat pipe heat exchanger is as described in claim 1. The wear-resistant and corrosion-resistant heat pipe heat exchanger described in any one of the 8 methods is obtained.

10. A low-temperature economizer, characterized in that, The low-temperature economizer includes at least one wear-resistant and corrosion-resistant heat pipe heat exchanger as described in claim 8.

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