High-temperature cleaning plate heat exchanger device with coating enhanced heat transfer

Abstract

The invention discloses a high-temperature cleaning plate heat exchanger device with a coating enhanced heat transfer function. The high-temperature cleaning plate heat exchanger device comprises a heat exchanger body, a composite coating and a high-temperature cleaning system. A clamping plate assembly of the heat exchanger body is of a bionic honeycomb topological optimization structure, the thickness is reduced by 10%-20% (cost is reduced) compared with a traditional clamping plate, meanwhile, the pressure bearing capacity is improved by 20% or above, balance of economical efficiency and structural stability is achieved, the micro-nano concave-convex structure on the surface of the composite coating can enlarge the heat transfer area and restrain dirt attachment, and the service life of the heat exchanger is prolonged. A self-cleaning-efficient heat transfer synergistic mechanism is formed in combination with a high-temperature cleaning system, the later maintenance frequency is reduced, the operation cost is reduced, plasma spraying and ion implantation technologies are integrated to prepare a composite coating, and the industrial production feasibility and operation reliability of the device are improved in combination with precise regulation and control of the control module on the cleaning process. The heat exchanger is suitable for various industrial heat exchange scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of plate heat exchangers, in particular to a high-temperature cleaning plate heat exchanger device with enhanced heat transfer coating. Background Art

[0002] Existing plate heat exchangers face multiple technical challenges in industrial applications. First, the connecting flange components of heat exchangers are mostly made of carbon steel or so-called "stainless iron". If they are not shipped for a long time after the hydrostatic test, the inner wall of the pipe diameter is prone to rust due to factors such as environmental humidity and medium residue. This not only affects the appearance and service life of the equipment, but also may contaminate the circulating medium, making it particularly difficult to meet the needs of customers with strict rust prevention requirements. Second, traditional high-temperature cleaning technology may damage the metal surface of the heat exchanger during the cleaning process, and it is difficult to balance the cleaning effect with the corrosion protection requirements of the equipment. Third, existing cleaning fluids and pre-purification systems are poorly adaptable to media with high chlorine content or specific contaminants, which can easily lead to incomplete cleaning or secondary contamination. Fourth, the design of the heat exchanger clamping plate is often based on experience. Simply reducing the plate thickness to reduce costs will significantly reduce the pressure bearing capacity, making it difficult to balance economic efficiency and structural stability. Fifth, the improvement of the heat transfer efficiency of the heat exchanger and the anti-scaling and anti-corrosion functions are often separated, requiring additional processes to achieve, increasing production complexity and cost.

[0003] In view of this, combining the advantages of high-temperature cleaning technology with material surface modification technology, developing a plate heat exchanger device that integrates enhanced heat transfer, corrosion protection, high-efficiency high-temperature cleaning and structural optimization has become the key to solving the above problems. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a high-temperature cleaning plate heat exchanger device with enhanced heat transfer through a coating.

[0005] One of the purposes of the present invention is achieved by the following technical solution:

[0006] A high-temperature cleaning plate heat exchanger device with coating-enhanced heat transfer comprises a heat exchanger body, a composite coating and a high-temperature cleaning system; the heat exchanger body comprises a plurality of parallelly arranged heat exchange plates and a flange assembly connecting the heat exchange plates, wherein a medium flow channel is formed between the heat exchange plates; the composite coating covers the inner wall of the heat exchange plate and the inner wall of the pipe diameter of the flange assembly, and the composite coating is used to simultaneously achieve enhanced heat transfer and corrosion protection; the high-temperature cleaning system is connected to the medium flow channel inlet and outlet of the heat exchanger body, and is used to pass a high-temperature cleaning liquid into the medium flow channel to achieve cleaning, and the high-temperature cleaning system works in conjunction with the composite coating to maintain the structural stability of the composite coating during the cleaning process.

[0007] Furthermore, the composite coating is composed of a thermal conductivity enhancing phase and an anti-corrosion phase; the thermal conductivity enhancing phase is at least one of nano-silicon carbide, graphene or carbon nanotubes, and the anti-corrosion phase is at least one of nickel-based alloy, polytetrafluoroethylene or ceramic-based materials; the mass proportion of the thermal conductivity enhancing phase in the composite coating is 30%-60%.

[0008] Furthermore, the high-temperature cleaning system includes a cleaning liquid storage tank, a heating component, a delivery pump and a return pipe; the cleaning liquid storage tank is used to store the cleaning liquid, the heating component is used to heat the cleaning liquid to 80-150°C, the delivery pump pumps the high-temperature cleaning liquid into the medium flow channel inlet of the heat exchanger body, and the return pipe returns the cleaning liquid flowing through the medium flow channel to the cleaning liquid storage tank, forming a circulating cleaning loop.

[0009] Furthermore, the composite coating is prepared by combining a plasma spraying device with an ion implantation device; the spraying power of the plasma spraying device is 30-60 kW, and the implantation energy of the ion implantation device is 50-150 keV.

[0010] Furthermore, it also includes a control module; the control module is electrically connected to the high-temperature cleaning system and the heat exchanger body respectively, and is used to control the cleaning time, cleaning liquid temperature and flow of the high-temperature cleaning system, and coordinate the thermal response parameters of the composite coating during the cleaning process.

[0011] Furthermore, the pipe diameter material of the flange assembly is carbon steel or stainless iron, and the coverage thickness of the composite coating on the inner wall of the pipe diameter is 1.2-1.5 times the coverage thickness of the inner wall of the heat exchange plate.

[0012] Furthermore, the cleaning fluid is a composite environmentally friendly cleaning fluid suitable for high-chloride media, including an organic acid cleaning agent, a corrosion inhibitor and nanofiltration material particles; the nanofiltration material particles are titanium dioxide or zinc oxide nanoparticles, with a particle size of 50-200nm and a mass concentration of 0.5%-2% in the cleaning fluid.

[0013] Furthermore, the surface of the composite coating has a micro-nano concave-convex structure, the average depth of the micro-nano concave-convex structure is 5-20 μm, and the micro-nano concave-convex structure is used to enhance the heat transfer area and inhibit dirt adhesion.

[0014] Furthermore, the heat exchanger body also includes a clamping plate assembly, which adopts a bionic honeycomb topology optimization structure. The structure is made of aluminum alloy or titanium alloy through 3D printing. Its thickness is reduced by 10%-20% compared with traditional clamping plates, and its pressure bearing capacity is increased by more than 20%.

[0015] Furthermore, the high-temperature cleaning system also includes a temperature sensor and a flow regulating valve; the temperature sensor is arranged at the outlet of the medium flow channel to detect the outlet temperature of the cleaning liquid; the flow regulating valve is arranged between the delivery pump and the inlet of the medium flow channel, and the control module adjusts the opening of the flow regulating valve according to the detection result of the temperature sensor.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention provides a composite coating on the inner wall of the heat exchange plate and the inner wall of the flange assembly pipe diameter, which can not only improve the heat transfer efficiency through the thermal conductivity enhancement phase, but also solve the corrosion problem of carbon steel / stainless iron materials through the anti-corrosion phase, realizing the integrated function of "heat transfer enhancement-corrosion protection", especially meeting the needs of scenarios with high anti-rust requirements.

[0018] 2. The high-temperature cleaning system works in conjunction with the composite coating to maintain the stability of the coating structure during the high-temperature cleaning process, ensuring the cleaning effect (removing dirt and impurities) while avoiding damage to the coating, extending the coating's service life, and resolving the contradiction between traditional high-temperature cleaning and equipment protection.

[0019] 3. The high-temperature cleaning system adopts a composite environmentally friendly cleaning fluid suitable for high-chlorine media, and with the reflux circulation design, it can effectively treat high-chlorine or specific polluted media, reduce the corrosion of the cleaning fluid to the equipment and the pollution to the environment, and improve the cleaning adaptability.

[0020] 4. The clamping plate assembly of the heat exchanger body adopts a bionic honeycomb topology optimization structure. While reducing the thickness by 10%-20% compared with traditional clamping plates (reducing costs), the pressure bearing capacity is increased by more than 20%, achieving a balance between economy and structural stability.

[0021] 5. The micro-nano concave-convex structure on the surface of the composite coating can enhance the heat transfer area and inhibit dirt adhesion. Combined with the high-temperature cleaning system, it forms a "self-cleaning-efficient heat transfer" synergistic mechanism, reducing the frequency of subsequent maintenance and lowering operating costs.

[0022] 6. The integrated plasma spraying and ion implantation technologies are used to prepare composite coatings. Combined with the precise control of the cleaning process by the control module, the industrial production feasibility and operational reliability of the device are improved, making it suitable for a variety of industrial heat exchange scenarios.

[0023] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1is a perspective view of this embodiment;

[0025] Figure 2 It is a front view of this embodiment;

[0026] Figure 3 is a rear perspective view of this embodiment;

[0027] Figure 4 This is a schematic diagram of the composite coating structure of the components of this embodiment;

[0028] Figure 5 This is a schematic structural diagram of the heat exchanger body of the component of this embodiment;

[0029] Figure 6 This is a partial cross-sectional schematic diagram of the composite coating of the component of this embodiment;

[0030] Figure 7 This is a front cross-sectional view of the component cleaning liquid storage tank of this embodiment.

[0031] In the figure: 1. Heat exchanger body; 11. Heat exchange plate; 12. Flange assembly; 121. Pipe diameter; 13. Medium flow channel; 14. Clamping plate assembly; 2. Composite coating; 21. Thermal conductivity enhancement phase; 22. Anti-corrosion phase; 23. Micro-nano concave-convex structure; 3. High-temperature cleaning system; 31. Cleaning liquid storage tank; 32. Heating assembly; 33. Delivery pump; 34. Return pipe; 311. Machine acid cleaning agent; 312. Corrosion inhibitor; 313. Nanofiltration material particles; 35. Temperature sensor; 36. Flow control valve; 4. Plasma spraying equipment; 5. Ion implantation device; 6. Control module. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0033] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Example 1: Please refer to Figures 1 to 7The high-temperature cleaning plate heat exchanger device with enhanced heat transfer by coating of this embodiment includes a heat exchanger body 1, a composite coating 2 and a high-temperature cleaning system 3; the heat exchanger body 1 includes a plurality of parallel heat exchange plates 11 and a flange assembly 12 connecting the heat exchange plates 11, and a medium flow channel 13 is formed between the heat exchange plates 11; the composite coating 2 covers the inner wall of the heat exchange plate 11 and the inner wall of the pipe diameter of the flange assembly 12, and the composite coating 2 is used to simultaneously achieve enhanced heat transfer and corrosion protection; the high-temperature cleaning system 3 is connected to the inlet and outlet of the medium flow channel 13 of the heat exchanger body 1, and is used to pass a high-temperature cleaning liquid into the medium flow channel 13 to achieve cleaning, and The high-temperature cleaning system 3 works in conjunction with the composite coating 2 to maintain the structural stability of the composite coating 2 during the cleaning process. The composite coating 2 is composed of a thermal conductivity enhancement phase 21 and an anti-corrosion phase 22. The thermal conductivity enhancement phase 21 is at least one of nano-silicon carbide, graphene or carbon nanotubes, and the anti-corrosion phase 22 is at least one of nickel-based alloys, polytetrafluoroethylene or ceramic-based materials. The mass proportion of the thermal conductivity enhancement phase 21 in the composite coating 2 is 30%-60%. The high-temperature cleaning system 3 includes a cleaning liquid storage tank 31, a heating component 32, a delivery pump 33 and a reflux pipe 34. The cleaning liquid storage tank 31 is used to store the cleaning liquid, and the heating component 32 is used to heat the cleaning liquid to 80-150°C, the delivery pump 33 pumps the high-temperature cleaning liquid into the inlet of the medium flow channel 13 of the heat exchanger body 1, and the return pipe 34 returns the cleaning liquid flowing through the medium flow channel 13 to the cleaning liquid storage tank 31 to form a circulating cleaning loop. The composite coating 2 is prepared by a plasma spraying device 4 combined with an ion implantation device 5; the spraying power of the plasma spraying device 4 is 30-60kW, and the implantation energy of the ion implantation device 5 is 50-150keV. It also includes a control module 6; the control module 6 is electrically connected to the high-temperature cleaning system 3 and the heat exchanger body 1 respectively, and is used to control the high-temperature cleaning The cleaning time, cleaning fluid temperature, and flow rate of system 3 are controlled, and the thermal response parameters of the composite coating 2 during the cleaning process are coordinated. The pipe diameter 121 of the flange assembly 12 is made of carbon steel or stainless steel. The thickness of the composite coating 2 on the inner wall of the pipe diameter 121 is 1.2-1.5 times the thickness of the inner wall of the heat exchange plate 11. The cleaning fluid is a composite environmentally friendly cleaning fluid suitable for high-chloride media, including an organic acid cleaning agent 311, a corrosion inhibitor 312, and nano-filter material particles 313. The nano-filter material particles 313 are titanium dioxide or zinc oxide nanoparticles with a particle size of 50-200nm and a mass concentration of 0.The surface of the composite coating 2 has a micro-nano concave-convex structure 23 with an average depth of 5-20 μm. This structure is used to enhance the heat transfer area and inhibit dirt adhesion. The heat exchanger body 1 also includes a clamping plate assembly 14. This clamping plate assembly 14 utilizes a biomimetic honeycomb topology optimization structure. Made from aluminum or titanium alloy via 3D printing, its thickness is 10%-20% thinner than traditional clamping plates, and its pressure bearing capacity is increased by over 20%. The high-temperature cleaning system 3 also includes a temperature sensor 35 and a flow control valve 36. The temperature sensor 35 is located at the outlet of the medium flow channel 13 to detect the outlet temperature of the cleaning fluid. The flow control valve 36 is located between the delivery pump 33 and the inlet of the medium flow channel 13. The control module 6 adjusts the opening of the flow control valve 36 based on the detection results of the temperature sensor 35.

[0036] Example 2:

[0037] 1. Heat exchanger body configuration

[0038] Heat exchange plates: Made of 304 stainless steel, 20 plates are arranged in parallel with a plate spacing of 5mm, forming 19 medium flow channels (200mm wide and 800mm long), suitable for heat exchange scenarios between industrial circulating water and thermal oil.

[0039] Flange assembly: The pipe diameter is made of carbon steel (model Q235), the pipe diameter size Connect the inlet and outlet of the heat exchange plate with bolts to ensure the sealing pressure is ≥1.6MPa.

[0040] Clamping plate assembly: It adopts a bionic honeycomb topology optimization structure, made of 6061 aluminum alloy, prepared by 3D printing, with a thickness of 12mm (15% thinner than traditional clamping plates), and a measured pressure bearing capacity of 2.5MPa (25% higher than traditional ones).

[0041] 2. Composite coating parameters

[0042] Composition: The thermal conductivity enhancing phase is nano-silicon carbide (average particle size 50nm, 45% by mass), and the corrosion-resistant phase is nickel-based alloy (Ni-Cr-Mo system, 55% by mass).

[0043] Preparation process: plasma spraying equipment (spraying power 45kW, spraying distance 150mm) combined with ion implantation device (injection energy 100keV, injection dose 5×10 16 ions / cm 2 ) preparation, the total coating thickness is: 80μm for the inner wall of the heat exchange plate, and 100μm for the inner wall of the flange assembly pipe diameter (1.25 times the thickness of the inner wall of the plate).

[0044] Surface structure: The coating surface is micro-nano processed to form a concave-convex structure with an average depth of 12μm, which can increase the heat transfer area by about 15% and inhibit scale adhesion.

[0045] 3. High temperature cleaning system configuration

[0046] Cleaning liquid storage tank: capacity 500L, stores composite environmentally friendly cleaning liquid, the specific formula is: organic acid cleaning agent (citric acid, mass proportion 85%), corrosion inhibitor (benzotriazole, mass proportion 13%), nano-filtration material particles (titanium dioxide, particle size 100nm, mass concentration 1%), suitable for cleaning media with chlorine content ≤500mg / L.

[0047] Heating component: Use electric heating tube (power 15kW) to heat the cleaning liquid to 120℃ (±5℃).

[0048] Circulation loop: delivery pump (flow rate 5m 3 / h, lift 30m) pump the high temperature cleaning liquid into the medium flow channel inlet, return pipe The cleaning fluid flowing through the flow channel is returned to the storage tank to form a closed loop.

[0049] Control components: A temperature sensor is installed at the outlet of the medium flow channel (measuring range 0-200℃, accuracy ±1℃), and a flow control valve is installed between the delivery pump and the flow channel inlet (adjustment range 0-8m 3 / h), real-time feedback control of cleaning fluid parameters.

[0050] 4. Control module function

[0051] It is electrically connected to the high-temperature cleaning system and the heat exchanger body and controlled by the PLC program: the cleaning time is set to 30 minutes, the cleaning liquid temperature is stabilized at 120℃, and the initial flow rate is set to 3m 3 / h; according to the outlet temperature sensor feedback (if the outlet temperature is lower than 115℃, the flow control valve opening will be automatically increased to 4m 3 / h; if it is higher than 125℃, reduce to 2m 3 / h), coordinate the thermal response of the composite coating at high temperature (thermal expansion coefficient matching error ≤ 0.5×10 -6 / ℃) to ensure that the coating does not crack or peel off during the cleaning process.

[0052] 5. Application effect

[0053] 1. Heat transfer efficiency: 20% higher than traditional plate heat exchangers (under the same working conditions, the heat transfer capacity is increased from 80kW to 96kW).

[0054] 2. Anti-corrosion performance: The flange assembly pipe diameter has no rust after 500 hours of salt spray test (NaCl concentration 5%); after the composite coating is recycled 300 times in 120℃ cleaning fluid, the coating integrity rate is ≥98%.

[0055] 3. Cleaning effect: The cleaning rate of dirt (mainly calcium carbonate and iron oxide) formed by chlorine-containing media is ≥95%, and there is no secondary pollution.

[0056] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A high-temperature cleaning plate heat exchanger device with enhanced heat transfer by coating, characterized in that: The invention comprises a heat exchanger body (1), a composite coating (2) and a high-temperature cleaning system (3); the heat exchanger body (1) comprises a plurality of parallel heat exchange plates (11) and a flange assembly (12) connecting the heat exchange plates (11), and a medium flow channel (13) is formed between the heat exchange plates (11); the composite coating (2) covers the inner wall of the heat exchange plate (11) and the inner wall of the pipe diameter of the flange assembly (12), and the composite coating (2) is used to simultaneously achieve enhanced heat transfer and corrosion protection; the high-temperature cleaning system (3) is connected to the inlet and outlet of the medium flow channel (13) of the heat exchanger body (1), and is used to pass a high-temperature cleaning liquid into the medium flow channel (13) to achieve cleaning, and the high-temperature cleaning system (3) works in conjunction with the composite coating (2) to maintain the structural stability of the composite coating (2) during the cleaning process.

2. The device according to claim 1, characterized in that The composite coating (2) is composed of a thermal conductivity enhancing phase (21) and an anti-corrosion phase (22); the thermal conductivity enhancing phase (21) is at least one of nano-silicon carbide, graphene or carbon nanotubes, and the anti-corrosion phase (22) is at least one of nickel-based alloy, polytetrafluoroethylene or ceramic-based materials; the mass proportion of the thermal conductivity enhancing phase (21) in the composite coating (2) is 30%-60%.

3. The device according to claim 1, characterized in that The high-temperature cleaning system (3) comprises a cleaning liquid storage tank (31), a heating component (32), a delivery pump (33) and a return pipe (34); the cleaning liquid storage tank (31) is used to store cleaning liquid, the heating component (32) is used to heat the cleaning liquid to 80-150°C, the delivery pump (33) pumps the high-temperature cleaning liquid into the inlet of the medium flow channel (13) of the heat exchanger body (1), and the return pipe (34) returns the cleaning liquid flowing through the medium flow channel (13) to the cleaning liquid storage tank (31), thereby forming a circulating cleaning loop.

4. The device according to claim 1, characterized in that The composite coating (2) is prepared by combining a plasma spraying device (4) with an ion implantation device (5); the spraying power of the plasma spraying device (4) is 30-60 kW, and the implantation energy of the ion implantation device (5) is 50-150 keV.

5. The device according to claim 1, characterized in that The heat exchanger (1) further comprises a control module (6); the control module (6) is electrically connected to the high-temperature cleaning system (3) and the heat exchanger body (1), respectively, and is used to control the cleaning time, cleaning liquid temperature and flow rate of the high-temperature cleaning system (3), and coordinate the thermal response parameters of the composite coating (2) during the cleaning process.

6. The device according to claim 1, characterized in that The pipe diameter (121) of the flange assembly (12) is made of carbon steel or stainless iron, and the coating thickness of the composite coating (2) on the inner wall of the pipe diameter (121) is 1.2-1.5 times the coating thickness of the inner wall of the heat exchange plate (11).

7. The device according to claim 3, characterized in that The cleaning liquid is a composite environmentally friendly cleaning liquid suitable for high-chloride media, comprising an organic acid cleaning agent (311), a corrosion inhibitor (312) and nano-filter material particles (313); the nano-filter material particles (313) are titanium dioxide or zinc oxide nanoparticles, with a particle size of 50-200 nm and a mass concentration of 0.5%-2% in the cleaning liquid.

8. The device according to claim 1, characterized in that The surface of the composite coating (2) has a micro-nano concave-convex structure (23), the average depth of the micro-nano concave-convex structure (23) is 5-20 μm, and the micro-nano concave-convex structure (23) is used to enhance the heat transfer area and inhibit dirt adhesion.

9. The device according to claim 1, characterized in that The heat exchanger body (1) further comprises a clamping plate assembly (14), wherein the clamping plate assembly (14) adopts a bionic honeycomb topology optimization structure, and the structure is made of aluminum alloy or titanium alloy through 3D printing, and its thickness is reduced by 10%-20% compared with a traditional clamping plate, and its pressure bearing capacity is increased by more than 20%.

10. The device according to claim 3, characterized in that The high-temperature cleaning system (3) further comprises a temperature sensor (35) and a flow regulating valve (36); the temperature sensor (35) is arranged at the outlet of the medium flow channel (13) for detecting the outlet temperature of the cleaning liquid; the flow regulating valve (36) is arranged between the delivery pump (33) and the inlet of the medium flow channel (13); and the control module (6) adjusts the opening of the flow regulating valve (36) according to the detection result of the temperature sensor (35).

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