A marine antifouling method for a titanium alloy afterheat heat exchanger cavity

Abstract

This invention provides a marine antifouling method for the cavity of a titanium alloy waste heat exchanger, mainly composed of a titanium alloy mesh box, antifouling slow-release sheets, and a spatially distributed arrangement within the heat exchanger. The antifouling slow-release sheets comprise water-soluble resin, hydrated slow-release resin, antifouling functional filler, and fiber cotton, which are placed inside the titanium alloy mesh box for installation and fixation. The antifouling agent within the sheets is slowly released to inhibit the reproduction and growth of marine organisms. Finally, the sheets are evenly distributed along the sides of the titanium alloy waste heat exchanger to maintain a sufficient concentration of antifouling agent within the cavity, ensuring that fouling organisms cannot reproduce and grow within the cavity, thus achieving antifouling of the titanium alloy waste heat exchanger. This marine antifouling method for the cavity of a titanium alloy waste heat exchanger allows for rapid maintenance of the titanium alloy waste heat exchanger, reduces the cost of antifouling methods, improves the heat exchange efficiency of the heat exchanger, and avoids affecting the safety of equipment operation.

Description

Technical Field

[0001] This invention relates to the field of marine antifouling technology, and more specifically, to a marine antifouling method for the cavity of a titanium alloy waste heat exchanger. Background Technology

[0002] Waste heat exchangers are crucial heat exchange devices in marine equipment, primarily used for waste heat discharge or emergency heat removal. However, the adhesion of marine fouling organisms to the heat exchanger surface reduces its heat exchange efficiency. While titanium alloys are widely used as the design substrate in new waste heat exchangers due to their excellent corrosion resistance, their inherent biocompatibility makes them more susceptible to marine organism adhesion, severely impacting operational safety. To balance heat exchanger surface heat transfer efficiency, antifouling measures include antifouling coatings, heat transfer protective coatings, electrolytic chlorination, and electrolytic copper antifouling technologies. However, existing antifouling coatings, using acrylic resin as a base material, exhibit poor heat transfer efficiency, with temperature delays exceeding 5°C, making them unsuitable for heat exchanger antifouling designs. Furthermore, a paper by Yu Qingjie from Dalian University of Technology reported a multifunctional heat transfer and protective coating using copper oxide / fluorosilicon oligomer nanocomposite. This technology employed a sol-gel method to prepare copper oxide / silica and nickel oxide / silica nanocomposite ceramic coatings, but primarily verified their heat transfer and corrosion resistance performance, without verifying their anti-marine biofouling performance. Additionally, existing electrolytic chlorine production and electrolytic copper antifouling technologies both use an external power source to control the potential of the metal electrodes to achieve chlorine production or copper electrolysis, currently mainly applied to pipelines. Because these technologies involve a series of hydrogen production problems during the electrolysis process, they can easily cause hydrogen embrittlement of the titanium alloy substrate, posing a significant threat to the safe operation of equipment. Therefore, a marine antifouling measure with high safety suitable for titanium alloy waste heat exchangers remains lacking, which will hinder the widespread use of titanium alloy waste heat exchangers. Thus, researching how to improve the surface protection against marine biofouling of titanium alloy heat exchangers is of great significance.

[0003] Patent CN103836840B mentions a shell-and-tube type integrated wastewater heat pump energy enhancement device for descaling and heat exchange. This device consists of a shell-and-tube heat exchanger for liquid-solid temporary separation of wastewater, a water pump, a compressor, a four-way reversing valve, a throttling mechanism, and a user-side heat exchanger. It utilizes swirling technology to increase the inlet water velocity, significantly increasing turbulence and reducing or even eliminating laminar flow to some extent, thereby significantly reducing heat transfer resistance and promoting heat transfer between the inlet water and the refrigerant. Solid impurities mixed in the inlet water are also addressed by centrifugal force. Under the action of the pump, the scale will continuously impact the outer wall of the spiral heat exchanger tube bundle. Due to long-term use, the scale deposited on the outer wall of the spiral heat exchanger tube bundle is subjected to periodic impact stress. Under the fatigue mechanism, cracks gradually appear on the scale layer until it falls off and enters the main stream. The random collision of solid impurities mixed in the feed water with the scale layer prevents the scale from depositing on the outer wall of the heat exchanger tube bundle and from growing on the outer wall of the heat exchanger tube bundle, thereby effectively controlling the scale thickness or removing the scale deposited on the outer wall of the heat exchanger tube bundle. However, the device has a complex structure and high cost. Summary of the Invention

[0004] In view of this, the present invention aims to propose a marine antifouling method for the cavity of a titanium alloy waste heat exchanger, in order to solve the problem of severe marine biofouling on the surface of titanium alloy waste heat exchangers in the prior art. This effectively reduces the ease of installation of the devices used in the antifouling method, employs replaceable antifouling slow-release sheets to achieve rapid maintenance of the titanium alloy waste heat exchanger, effectively solves the antifouling requirements of the titanium alloy waste heat exchanger, and the antifouling device reduces the cost of the antifouling method, greatly improves the heat exchange efficiency of the heat exchanger, and avoids affecting the safety of equipment operation.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] This invention relates to a marine antifouling method for the cavity of a titanium alloy waste heat exchanger. The method employs an antifouling device comprising a mesh box and antifouling slow-release plates. By adjusting the antifouling device according to the varying structural characteristics of the internal cavity of different titanium alloy waste heat exchangers, the antifouling device is positioned within the heat exchanger cavity to achieve antifouling of the heat exchanger. The method specifically includes the following steps:

[0007] Step 1: Process the wire mesh box;

[0008] Step 2: Prepare antifouling sustained-release tablets;

[0009] Step 3: Place the antifouling slow-release tablets inside the mesh box to form an antifouling device, and install the antifouling device inside the heat exchanger cavity. The number of antifouling devices to be installed is determined according to the size of the space inside the selected heat exchanger cavity.

[0010] Furthermore, the box includes a lid and a substrate. The lid is detachably mounted on top of the substrate, and a cavity is formed between the lid and the substrate to facilitate the installation of the anti-fouling slow-release tablet.

[0011] Furthermore, step one includes:

[0012] Step S11: Processing the wire mesh box: Using titanium alloy metal mesh as the processing material, process the box lid of the wire mesh box according to the first dimension. The first dimension of the box lid is a1mm*b1mm*c1mm, where a1 represents the length of the box lid, b1 represents the width of the box lid, and c1 represents the height of the box lid.

[0013] Step S12: Process the box substrate of the mesh box according to the second dimension, which is a2mm*b2mm, where a2 represents the length of the box substrate and b2 represents the width of the box substrate.

[0014] Furthermore, in step S11, the mesh shape of the titanium alloy metal mesh plate is any one or more of the following: diamond-shaped holes or circular holes.

[0015] Furthermore, the antifouling slow-release tablet includes a resin base, an antifouling agent functional filler, and fiber cotton, with the resin base and antifouling agent functional filler adsorbed and disposed on the fiber cotton.

[0016] Furthermore, step two includes:

[0017] Step S21: Preparation of antifouling slow-release tablets: According to the composition ratio of antifouling slow-release tablets, select the appropriate amount of resin base material and antifouling functional filler, and mix them evenly to form a slurry;

[0018] Step S22: Prepare a sustained-release tablet mold according to the third dimension a3mm*b3mm*c3mm, where a3 represents the length of the sustained-release tablet mold, b3 represents the width of the sustained-release tablet mold, and c3 represents the depth of the sustained-release tablet mold;

[0019] Step S23: Cut the fiber cotton into the fourth size according to the size of the sustained-release tablet mold;

[0020] Step S24: Soak the fiber cotton in the slurry to form slurry-coated fiber cotton, and place the soaked slurry-coated fiber cotton in the slow-release tablet mold;

[0021] Step S25: Dry and demold to obtain anti-fouling sustained-release tablets.

[0022] Furthermore, in step S24, a substrate film is placed between the pulped fiber cotton and the slow-release tablet mold. The substrate film is used to facilitate demolding.

[0023] Furthermore, the resin base material includes any one or more components of water-soluble resin and hydrated slow-release resin.

[0024] Furthermore, the antifouling functional filler includes any one or more components of cuprous oxide, zinc oxide, and organic antifouling agents.

[0025] Furthermore, the fiber cotton can be either polyester fiber cotton or glass fiber cotton.

[0026] Compared with existing technologies, the marine antifouling method for titanium alloy waste heat exchanger cavities described in this invention has the following advantages:

[0027] The method described above can effectively reduce the difficulty of installing the devices used in the anti-fouling method. By using replaceable anti-fouling slow-release plates, rapid maintenance of titanium alloy waste heat exchangers can be achieved, effectively solving the anti-fouling requirements of titanium alloy waste heat exchangers. Moreover, the setting of anti-fouling devices can reduce the cost of anti-fouling methods, greatly improve the heat exchange efficiency of heat exchangers, and avoid affecting the safety of equipment operation. Attached Figure Description

[0028] The accompanying drawings, which constitute a part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0029] In the picture:

[0030] Figure 1 This is a top view diagram of the wire mesh cover;

[0031] Figure 2 This is a schematic diagram of the main view of the wire mesh cover;

[0032] Figure 3 This is a schematic diagram of the left view of the wire mesh cover;

[0033] Figure 4 Schematic diagram of the mesh box substrate;

[0034] Figure 5 This is a schematic diagram of an antifouling slow-release tablet;

[0035] Figure 6 This is a schematic diagram of the overall assembly of the antifouling slow-release tablets and the mesh box;

[0036] Figure 7 Schematic diagram of the layout of antifouling slow-release tablets;

[0037] Figure 8 A schematic diagram of a blank control sample (overall sample) for a titanium alloy waste heat exchanger;

[0038] Figure 9 A schematic diagram of a blank control sample (partial wall surface contamination) for a titanium alloy waste heat exchanger;

[0039] Figure 10A schematic diagram of a blank control sample for a titanium alloy waste heat exchanger (partial fouling of the heat exchanger).

[0040] Figure 11 Schematic diagram of a test sample for installing anti-fouling slow-release plates on a titanium alloy waste heat exchanger;

[0041] Figure 12 A schematic diagram of a test sample with anti-fouling slow-release plates installed to simulate a titanium alloy waste heat exchanger.

[0042] Explanation of reference numerals in the attached drawings: 1. Mesh box; 11. Box lid; 12. Box liner; 13. Cavity; 2. Anti-fouling slow-release sheet; 3. Anti-fouling device. Detailed Implementation

[0043] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to communicate the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] This embodiment is for a marine antifouling device. Similar to conventional marine antifouling devices, the overall structure consists of a heat exchanger and a metal mesh.

[0047] In existing technologies, both electrolytic chlorine production and electrolytic copper antifouling technologies use an external power source connected to the compartment to control the potential of the metal electrodes to achieve chlorine production or copper electrolysis. Currently, these technologies are mainly used in pipelines. However, due to the series of hydrogen production problems that accompany the electrolysis process, these technologies can easily cause hydrogen embrittlement of the titanium alloy substrate, posing a significant threat to the safe operation of the equipment.

[0048] To address the severe marine biofouling problem on the surface of titanium alloy waste heat exchangers in existing technologies, this embodiment proposes a marine antifouling method for the cavity of titanium alloy waste heat exchangers. The method employs an antifouling device 3, comprising a mesh box 1 and antifouling slow-release sheets 2. By adjusting the antifouling device 3 according to the varying structural characteristics of the internal cavity of different titanium alloy waste heat exchangers, the antifouling device 3 is positioned within the heat exchanger cavity, thereby achieving antifouling of the heat exchanger. The specific steps include:

[0049] Step 1: Process wire mesh box 1;

[0050] Step 2: Prepare antifouling sustained-release tablet 2;

[0051] Step 3: Place the antifouling slow-release tablet 2 inside the mesh box 1 to form an antifouling device 3, and install the antifouling device 3 inside the heat exchanger cavity. At least one antifouling device 3 is installed. The number of antifouling devices 3 required is determined based on the size of the space inside the selected heat exchanger cavity. Specifically, the distribution points within the cavity are determined based on the size of the space inside the selected heat exchanger cavity, and antifouling devices 3 are installed at each distribution point. At least one antifouling device 3 is installed at each distribution point to ensure that the concentration of the antifouling agent released by the antifouling device 3 covers the entire heat exchanger cavity space, preventing marine biofouling on the titanium. To prevent fouling on the surface of the alloy heat exchanger, it is particularly important to note that the antifouling device 3 is located on the non-inlet / outlet side of the heat exchanger. That is, the antifouling device 3 is located on the fixing rib or the plane of the side of the heat exchanger cavity. The fixing method of the antifouling device 3 to the heat exchanger cavity side is set according to the requirements. In this embodiment, the fixing method includes any one or more of bolts, clips, and wire screws. The number of antifouling devices 3 varies depending on the size of the cavity space of different types of heat exchangers, so as to ensure that the concentration of antifouling agent covers the entire heat exchanger cavity, meet the antifouling requirements of the heat exchanger, and inhibit the adhesion of marine biofouling.

[0052] The aforementioned antifouling method effectively reduces the ease of installation of the devices used in the antifouling process. The use of replaceable antifouling slow-release sheets 2 enables rapid maintenance of the titanium alloy waste heat exchanger, effectively addressing the antifouling requirements of the titanium alloy waste heat exchanger. Furthermore, the inclusion of antifouling device 3 reduces the cost of the antifouling method, significantly improves the heat exchanger's efficiency, and avoids impacting equipment operational safety. In addition, this method utilizes the release of a large amount of antifouling agent from the antifouling slow-release sheets 2 to form a certain concentration of antifouling agent system within the heat exchanger cavity. Combined with spatial distribution points set according to the size of the cavity, and the installation of antifouling devices 3 at these points, the antifouling agent concentration covers the entire cavity space. This prevents marine biofouling from adhering to the titanium alloy heat exchanger, ensuring its heat exchange efficiency and improving the safety of ship operation.

[0053] The mesh box 1 includes a cover 11 and a substrate 12. The cover 11 is detachably mounted on top of the substrate 12, and a cavity 13 is formed between the cover 11 and the substrate 12 to facilitate the installation of the anti-fouling slow-release sheet 2. Specifically, step one includes:

[0054] Step S11: Processing the wire mesh box 1: Using titanium alloy metal mesh as the processing material, process the lid 11 of the wire mesh box 1 according to the first dimension. The first dimension of the lid 11 is a1mm*b1mm*c1mm, where a1 represents the length of the lid 11, b1 represents the width of the lid 11, and c1 represents the height of the lid 11.

[0055] Step S12: Process the box substrate 12 of the mesh box 1 according to the second dimension. The second dimension of the box substrate 12 is a2mm*b2mm, where a2 represents the length of the box substrate 12 and b2 represents the width of the box substrate 12.

[0056] The specific processing shapes of the box cover 11 and the box substrate 12 are set according to requirements. In step S11, the mesh shape of the titanium alloy metal mesh plate is any one or more of diamond-shaped holes or circular holes. Preferably, the size of the mesh of the titanium alloy metal mesh plate is in the range of 2mm-5mm. In addition, the values ​​of a1, b1, c1, a2, and b2 are all set according to requirements. In this embodiment, as shown in the figure: a1 = a2 = 150, b1 = b2 = 120, c1 = 10, but the actual specific values ​​are set according to requirements.

[0057] Preferably, a1 = a2, b1 = b2.

[0058] The combination of the cover 11 and the substrate 12 effectively supports the anti-fouling slow-release sheet 2, preventing the anti-fouling device 3 from dispersing under the scouring of water flow, thereby greatly improving the stability of the anti-fouling device 3. By using titanium alloy mesh plate for the mesh box 1, the impact of the mesh box 1 on the anti-fouling slow-release sheet 2 can be reduced, while improving the protection of the anti-fouling slow-release sheet 2.

[0059] Antifouling slow-release tablet 2 includes a resin base, an antifouling agent functional filler, and fiber cotton. The resin base and the antifouling agent functional filler are adsorbed and disposed on the fiber cotton; Step 2 includes:

[0060] Step S21: Preparation of antifouling slow-release tablet 2: According to the composition ratio of antifouling slow-release tablet 2, select the appropriate amount of resin base material and antifouling functional filler, and mix them evenly to form a slurry. The composition ratio refers to the proportion of resin base material, antifouling functional filler and fiber cotton contained in antifouling slow-release tablet 2. Add antifouling functional filler to resin base material and mix with a high-speed kneader to prepare slurry.

[0061] Step S22: Prepare a sustained-release tablet mold according to the third dimension a3mm*b3mm*c3mm, where a3 represents the length of the sustained-release tablet mold, b3 represents the width of the sustained-release tablet mold, and c3 represents the depth of the sustained-release tablet mold. The values ​​of a3, b3, and c3 are set according to the requirements.

[0062] Step S23: Cut the fiber cotton into the fourth size according to the size of the sustained-release tablet mold. The fourth size is a4mm*b4mm*c4mm, where a3 represents the length of the fiber cotton, b3 represents the width of the fiber cotton, and c3 represents the thickness of the fiber cotton. The values ​​of a4, b4, and c4 are set according to the requirements, but a4≤a3, b4≤b3, and c4≤c3.

[0063] Step S24: Soak the fiber cotton in the slurry to form slurry-coated fiber cotton, and place the soaked slurry-coated fiber cotton in the slow-release tablet mold. Preferably, the fiber cotton is soaked in the slurry for 48h-72h, so that the fiber cotton can absorb a large amount of slurry during this time.

[0064] Step S25: Drying and demolding to obtain antifouling slow-release tablet 2. The drying can be done by an oven. Preferably, the oven drying temperature is 40℃ and the drying time is 48h-72h.

[0065] In step S24, a substrate film is placed between the pulp-coated fiber cotton and the sustained-release tablet mold to facilitate demolding. Specifically, the substrate film is first laid on the bottom inner side of the sustained-release tablet mold, then the pulp-coated fiber cotton is placed inside the mold. After drying in an oven, the mold is demolded, and the substrate film inside the mold is removed to obtain the anti-fouling sustained-release tablet 2. The resin base material includes any one or more components of water-soluble resin and hydrated sustained-release resin. The water-soluble resin is either 1788 or 1792 polyvinyl alcohol. The hydrated sustained-release resin is a mixture of zinc acrylate resin and propylene glycol in a 5:5 ratio. The mixture of acrylic ester adhesives; the antifouling functional filler includes cuprous oxide, zinc oxide and any one or more of organic antifouling agents; the organic antifouling agent is any one or more of copper pyridinethione, zinc pyridinethione, zineb and isothiazolinone; the fiber cotton is any one of polyester fiber cotton and glass fiber cotton. In this embodiment, the substrate film is a polytetrafluoroethylene film, which is used as a substrate to facilitate the demolding of the cured antifouling slow-release sheet 2, but it is not limited to this in practice. In this embodiment, a3 = 90, b3 = 120, c3 = 10, but it is not limited to this in practice.

[0066] Preferably, the resin base material includes water-soluble resin and hydrated slow-release resin, with the amount of water-soluble resin ranging from 5g to 10g and the amount of hydrated slow-release resin ranging from 10g to 20g; the antifouling functional filler includes cuprous oxide, zinc oxide and organic antifouling agent, with the amount of cuprous oxide ranging from 35g to 40g; the amount of zinc oxide ranging from 10g to 15g; and the amount of organic antifouling agent ranging from 10g to 20g.

[0067] Antifouling device 3 is formed by installing antifouling slow-release plates 2 in titanium alloy mesh box 1 to secure the antifouling slow-release plates 2. Based on the heat exchanger cavity space, the antifouling device 3 is installed on the non-inlet / outlet side of the heat exchanger, greatly improving the safety and durability of the antifouling device 3. This prevents the concentration of the antifouling agent from diffusing out of the heat exchanger area due to water flow impact, enhancing the antifouling effect on the heat exchanger. The antifouling agent in the antifouling slow-release plates 2 is slowly released to inhibit the reproduction and growth of marine organisms. Finally, combined with the uniform distribution of the antifouling agent on the side of the titanium alloy waste heat exchanger cavity, it maintains a sufficient concentration of antifouling agent in the cavity, ensuring that fouling organisms cannot reproduce and grow in the cavity, thus achieving antifouling of the titanium alloy waste heat exchanger. Furthermore, this method simplifies the preparation and installation of the antifouling slow-release plates 2, eliminating the need for external power sources. Combined with the selected heat exchanger cavity space distribution, it achieves full antifouling coverage of the heat exchanger cavity space, enabling the titanium alloy waste heat exchanger to meet the operational requirements of the marine environment and facilitating the promotion and use of new waste heat exchangers.

[0068] Preferably, this anti-fouling method is not only applicable to titanium alloy waste heat exchangers, but also applicable to various types of heat exchanger devices.

[0069] Example 1:

[0070] 1) Processing of titanium alloy mesh box 1: The lid 11 of titanium alloy mesh box 1 is processed to a size of 150mm*120mm*10mm, and the bottom substrate 12 of mesh box 1 is processed to a size of 150mm*120mm. The specific processing shape is shown in the figure.

[0071] 2) Preparation of Antifouling Slow-Release Tablet 2: 5g of water-soluble resin and 20g of hydrated slow-release resin were used as the resin base. The antifouling functional filler consisted of 40g of cuprous oxide, 10g of zinc oxide, 5g of copper pyridine thione, 5g of zineb, and 3g of isothiazolinone organic antifouling agent. The antifouling functional filler was added to the resin and mixed using a high-speed kneader to form a slurry. The polyester fiber cotton was cut to a size of 110mm*80mm*10mm according to the mold structure of the slow-release tablet 2, and soaked in the slurry for about 58 hours to allow the fiber cotton to absorb a large amount of slurry. The fiber cotton was then transferred to the slow-release tablet mold, which had a size of 120*90*10mm. Before placing it, a layer of polytetrafluoroethylene film was added to the bottom as a substrate for demolding. The tablet was then placed in a 40℃ oven and dried for 48 hours. After drying, the polytetrafluoroethylene film at the bottom was removed to form the antifouling slow-release tablet 2.

[0072] 3) Installation and Assembly: Place the antifouling slow-release sheet 2 in the titanium alloy mesh box 1, and then fix it to the fixing rib on the side of the titanium alloy waste heat exchanger with titanium alloy bolts. The cavity volume is 80L and the heat exchanger length is about 1m. Arrange 12 antifouling slow-release sheets 2 evenly (6 sheets on the top and 6 sheets on the bottom) according to the length of the heat exchanger. The copper ion concentration in the cavity can reach 0.2mg / L. In a real-world test in Sanya, no fouling or biological attachment was observed in the cavity after 6 months, as shown in the figure.

[0073] Example 2:

[0074] 1) Processing of titanium alloy mesh box 1: The lid 11 of titanium alloy mesh box 1 is processed to a size of 150mm*120mm*10mm, and the bottom substrate 12 of mesh box 1 is processed to a size of 150mm*120mm. The specific processing shape is shown in the figure.

[0075] 2) Preparation of Antifouling Slow-Release Tablet 2: 7g of water-soluble resin and 20g of hydrated slow-release resin were used as the resin base. The antifouling functional filler consisted of 37g of cuprous oxide, 13g of zinc oxide, 4g of copper pyridinium ketone, 5g of zineb, and 4g of isothiazolinone organic antifouling agent. The antifouling functional filler was added to the resin and mixed using a high-speed kneader to form a slurry. The polyester fiber cotton was cut to a size of 110mm*80mm*10mm according to the mold structure of the slow-release tablet 2, and soaked in the slurry for about 50 hours to allow the fiber cotton to absorb a large amount of slurry. The fiber cotton was then transferred to the slow-release tablet mold, which had a size of 120*90*10mm. Before placing the mold, a layer of polytetrafluoroethylene film was added to the bottom as a substrate for demolding. The mold was placed in a 40℃ oven and dried for 60 hours. After drying, the polytetrafluoroethylene film at the bottom was removed to form the antifouling slow-release tablet 2.

[0076] 3) Installation and assembly: Place the anti-fouling slow-release tablet 2 in the titanium alloy mesh box 1, and then fix it to the surface of the object with cable ties. The volume of the cavity is 40L. According to the setting requirements, 6 anti-fouling slow-release tablets 2 are arranged. The copper ion concentration in the cavity can reach 0.3mg / L, as shown in the figure.

[0077] As can be seen from Examples 1 and 2 and the accompanying drawings, by means of the seepage of the antifouling agent in the antifouling slow-release sheet 2, a certain concentration of fouling inhibition is formed in the cavity, thereby preventing fouling organisms from multiplying and growing in the cavity. Compared with the blank sample, its actual marine antifouling effect is no less than 6 months, further proving the effectiveness of this antifouling measure. It can solve the problem of marine biofouling in titanium alloy waste heat exchangers, improve the service life of the heat exchanger, and the combination of antifouling slow-release sheet 2 and mesh box 1 facilitates replacement and maintenance, effectively improves the heat exchange efficiency of the heat exchanger, and protects the safety of ship operation.

[0078] In this invention, any marine antifouling device may include the marine antifouling device structure for the titanium alloy waste heat exchanger cavity described in this embodiment. Based on the relevant structure and assembly relationship of the antifouling slow-release sheet 2 and the mesh box 1 provided in this embodiment, the marine antifouling device also includes conventional components such as heat exchangers and metal mesh. Since these are all prior art, they will not be described in detail here.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A marine antifouling method for a titanium alloy waste heat exchanger cavity, characterized in that, The method employs an anti-fouling device (3), which includes a mesh box (1) and an anti-fouling slow-release sheet (2). By adjusting the internal cavity structure characteristics of different titanium alloy waste heat exchangers according to the variations, the anti-fouling device (3) is installed inside the heat exchanger cavity to achieve anti-fouling of the heat exchanger. Specifically, the method includes the following steps: Step 1: Processing the mesh box (1); The mesh box (1) includes a lid (11) and a substrate (12). The lid (11) is detachably mounted on top of the substrate (12). A cavity (13) is formed between the lid (11) and the substrate (12) to facilitate the installation of the anti-fouling slow-release tablet (2). Step 2: Preparation of antifouling slow-release tablets (2); Antifouling slow-release tablets (2) include resin base material, antifouling agent functional filler and fiber cotton, and the resin base material and antifouling agent functional filler are adsorbed and disposed on the fiber cotton; Step 3: Place the antifouling slow-release tablet (2) inside the mesh box (1) to form an antifouling device (3), and install the antifouling device (3) inside the heat exchanger cavity. The number of antifouling devices (3) to be installed is determined according to the size of the space inside the selected heat exchanger cavity. The antifouling device (3) is set on the fixing rib on the side of the heat exchanger cavity or on the plane where the side is located. Specifically, the distribution points of the space inside the cavity are determined according to the size of the space inside the selected heat exchanger cavity, and then the antifouling device (3) is set at each distribution point. At least one antifouling device (3) is set at each distribution point. Step two includes: Step S21: Preparation of antifouling slow-release tablets (2): According to the composition ratio of antifouling slow-release tablets (2), select the appropriate amount of resin base material and antifouling functional filler, and mix them evenly to form a slurry; wherein, the antifouling functional filler is added to the resin base material and mixed with a high-speed kneader to form a slurry; Step S22: Prepare a sustained-release tablet mold according to the third dimension a3mm*b3mm*c3mm, where a3 represents the length of the sustained-release tablet mold, b3 represents the width of the sustained-release tablet mold, and c3 represents the depth of the sustained-release tablet mold; Step S23: Cut the fiber cotton into the fourth size according to the size of the sustained-release tablet mold; Step S24: Soak the fiber cotton in the slurry to form slurry-coated fiber cotton, and place the soaked slurry-coated fiber cotton in the slow-release tablet mold; Step S25: Dry and demold to obtain antifouling sustained-release tablets (2); Specifically, in step S24, a substrate film is placed between the pulped fiber cotton and the slow-release tablet mold. The substrate film is used to facilitate demolding. The resin base material includes any one or more components of water-soluble resin and hydrated slow-release resin. The water-soluble resin is either 1788 or 1792 polyvinyl alcohol. The hydrated slow-release resin is a mixture of zinc acrylate resin and acrylate adhesive in a 5:5 ratio.

2. The marine antifouling method for a titanium alloy waste heat exchanger cavity according to claim 1, characterized in that, Step one includes: Step S11: Processing the wire mesh box (1): Using titanium alloy metal mesh as the processing material, the lid (11) of the wire mesh box (1) is processed according to the first dimension. The first dimension of the lid (11) is a1mm*b1mm*c1mm, where a1 represents the length of the lid (11), b1 represents the width of the lid (11), and c1 represents the height of the lid (11). Step S12: Process the box substrate (12) of the wire mesh box (1) according to the second dimension. The second dimension of the box substrate (12) is a2mm*b2mm, where a2 represents the length of the box substrate (12) and b2 represents the width of the box substrate (12).

3. A marine antifouling method for a titanium alloy waste heat exchanger cavity according to claim 2, characterized in that, In step S11, the mesh shape of the titanium alloy metal mesh plate is any one or more of the following: diamond-shaped holes or circular holes.

4. A marine antifouling method for a titanium alloy waste heat exchanger cavity according to claim 1, characterized in that, The antifouling functional filler includes cuprous oxide, zinc oxide, and any one or more components of organic antifouling agents.

5. A marine antifouling method for a titanium alloy waste heat exchanger cavity according to claim 1, characterized in that, The fiber cotton can be either polyester fiber cotton or glass fiber cotton.

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