Non-clogging suction system for circulating water interception net bag of nuclear power plant

Abstract

The invention provides a nuclear power plant circulating water interception net bag blockage-free suction system which comprises a floating mat, a floating mat limiting device, an interception net bag and a collecting device, the floating mat limiting device is connected with the floating mat, a base is connected to the floating mat, and a peripheral pump, a vacuum pump, a water-gas separation tank, a feeding valve and a discharging valve are fixedly installed on the base. A drain grating is mounted in the middle of the water-gas separation tank, a discharge port in the bottom of the water-gas separation tank is connected with a confluence pipeline, a discharge end of the confluence pipeline is connected with a collecting device, a large-opening end of the interception net bag is in butt joint with a water intake open channel of the nuclear power plant, and a small-opening end of the interception net bag is connected with a conveying pipe. The end, away from the intercepting net bag, of the conveying pipe is connected with the feeding end of the peripheral pump, and the feeding valve is installed on the conveying pipe. Through combination of the peripheral pump, the vacuum pump and the water-gas separation tank, the non-blocking function of the suction system is achieved, marine organism media in the nuclear power plant circulating water interception net bag can be continuously sucked, and the suction efficiency is high.

Description

Technical Field

[0001] This application relates to the technical field of nuclear power plant equipment, and particularly to a non-clogging suction system for a circulating water interception net bag in a nuclear power plant. Background Art

[0002] In order to cope with the shutdown and reactor trip events caused by the increasingly serious invasion of marine organisms into the cooling circulating water system of nuclear power plants, the current method mainly is to set up a collection net at the seawater inlet to intercept and collect organisms and solids in the incoming seawater. In the existing interception and collection system, most use a centrifugal pump to suck the marine organisms and seawater in the collection net into the collection device for cleaning. However, due to the existence of strip-shaped media in marine organisms, during actual operation, the centrifugal pump is easily blocked by the strip-shaped marine organism media, resulting in centrifugal pump failures. Therefore, after a period of time, manual cleaning of the centrifugal pump is required, which increases the labor intensity of operators and results in low suction efficiency.

[0003] In view of this, this application provides a non-clogging suction system for a circulating water interception net bag in a nuclear power plant. Summary of the Invention

[0004] To solve the above technical problems, the non-clogging suction system for a circulating water interception net bag in a nuclear power plant provided by this application includes a floating row, a floating row limiting device, an interception net bag, and a collection device. The floating row floats on the water surface. The floating row limiting device is connected to the floating row and is used to limit the movement range of the floating row within a preset value. A base is connected to the floating row, and a vortex pump, a vacuum pump, a water-air separation tank, a feed valve, and a discharge valve are fixedly installed on the base. The lower part of the water-air separation tank is provided with a feed port and a first discharge port, the upper part of the water-air separation tank is provided with a second discharge port, and a sewage interception grid is installed in the middle of the water-air separation tank. The discharge end of the vortex pump is connected to the feed port of the water-air separation tank. The second discharge port of the water-air separation tank is connected to the vacuum pump. A confluence pipeline is connected to the first discharge port of the water-air separation tank, and the discharge end of the confluence pipeline is connected to the collection device. The discharge valve is installed on the confluence pipeline. The interception net bag is installed at the water intake channel of the nuclear power plant along the water flow direction. The large end of the interception net bag is docked with the water intake channel of the nuclear power plant. The small end of the interception net bag is connected to a feeding pipe, and the end of the feeding pipe far from the interception net bag is connected to the feed end of the vortex pump. The feed valve is installed on the feeding pipe. Wherein, the surface of the sewage interception grid is coated with a TiO2 / Al2O3 composite coating, and in the TiO2 / Al2O3 composite coating, the weight ratio of TiO2 to Al2O3 is in the range of 1:3 to 1:6, and the thickness of the TiO2 / Al2O3 composite coating is in the range of 5μm to 15μm.

[0005] In some embodiments, the floating row limiting device includes a first anchor block and a first flexible connector, the first anchor block is fixed to the bottom of the water, one end of the first flexible connector is connected to the first anchor block, and the other end of the first flexible connector is connected to the floating row, thereby limiting the movement range of the floating row within a preset value.

[0006] In some embodiments, an interception net bag limiting device is also included, and the upper side of the interception net bag is slidably connected to an external horizontal rod set on the water surface. The interception net bag limiting device includes a second anchor block, a second flexible connector and a third anchor block. The second anchor block and the third anchor block are fixed to the bottom of the water along the direction of the water flow, and the third anchor block is located downstream of the second anchor block. One end of the second flexible connector is connected to the second anchor block, and the other end of the second flexible connector is connected to the upper side of the interception net bag slidably connected to the external horizontal rod.

[0007] In some embodiments, a manual release device is further included, and the small-mouth end of the interception net bag is connected to the feed pipe via the manual release device.

[0008] In some embodiments, a liquid level meter and a pressure sensor are further included, wherein both the liquid level meter and the pressure sensor are disposed in the water-gas separation tank, and the liquid level meter is located on the upper side of the trash grille, and the pressure sensor is located on the upper side of the liquid level meter.

[0009] In some embodiments, a check valve is further included, wherein the check valve is connected to the confluence pipe and is located between the discharge valve and the collection device.

[0010] In some embodiments, a flow meter installed on the confluence pipe is further included.

[0011] In some embodiments, the interception net bag is made of shape memory alloy and high-strength carbon fiber.

[0012] Compared with the prior art, the non-clogging suction system of the nuclear power plant circulating water interception net bag provided by the present application is based on a vortex pump, a vacuum pump and a water-gas separation tank as a suction device. Since the fluid medium in the vortex pump is isolated from the impeller in the pump, the vortex pump has an anti-winding function, which can effectively avoid the risk of banded marine organisms winding around the water pump impeller and causing jamming; at the same time, by setting a trash screen in the water-gas separation tank, the risk of marine organisms entering the vacuum pump and causing vacuum pump failure can be completely avoided. Since the modified trash screen has super-hydrophilic and anti-biological adhesion properties, the risk of the trash screen being blocked and corroded can be effectively prevented; moreover, the setting of the floating row, the floating row limiting device and the feed pipe enables the suction system set on the floating row to adapt to different ocean water levels. Therefore, the suction system provided by the present application has the characteristics of simple structure and non-clogging, and can continuously and uninterruptedly suck the marine biological medium in the nuclear power plant circulating water interception net bag. Compared with the prior art, the suction efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] By reading the following detailed description of the embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing some embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0014] Figure 1 shows a schematic structural diagram of the non-clogging suction system of the circulating water interception net bag in a nuclear power plant in the present application,

[0015] Figure 2 shows a schematic structural diagram of the suction device in the present application,

[0016] Figure 3 shows a suction flow chart of the suction system in the present application.

[0017] The reference numerals in the specific embodiments are as follows:

[0018] 1. floating row, 21. first anchor block, 22. first flexible connector, 3 interception net bag, 41. base, 42. vortex pump, 43. vacuum pump, 44. water-gas separation tank, 45. feed valve, 46. discharge valve, 47. trash rack, 48. liquid level gauge, 49. pressure sensor, 5. confluence pipeline, 6. feeding pipe, 71. second anchor block, 72. second flexible connector, 73. third anchor block, 8. manual release device, 9. check valve. SPECIFIC EMBODIMENTS

[0019] In the description of the present application, it should be understood that when terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are used to indicate the orientation or positional relationship, without special instructions, it is understood as the orientation or positional relationship based on the drawings shown. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. Taking Figure 1 as an example, upward perpendicular to the paper surface is the upper, downward perpendicular to the paper surface is the lower, left perpendicular to the paper surface is the left, right perpendicular to the paper surface is the right, forward perpendicular to the paper surface is the front, and backward perpendicular to the paper surface is the rear.

[0020] In addition, features limited with "first" and "second" for descriptive purposes only should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Features limited with "first" and "second" may explicitly or implicitly include at least one of the limited features. When the description "a plurality" appears, it generally means including at least two, such as two, three, etc., unless otherwise specifically limited.

[0021] In this application, unless otherwise clearly specified and limited, terms such as "installed", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection, it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In the description of this specification, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0023] Please refer to Figures 1 - 3As shown in the figure, the non-clogging suction system for the circulating water interception net bag of a nuclear power plant provided by the embodiment of the present application includes a floating row 1, a floating row limiting device, an interception net bag 3 and a collection device. The floating row 1 floats on the water surface. The floating row limiting device is connected to the floating row 1 and is used to limit the movement range of the floating row 1 within a preset value. A base 41 is connected to the floating row 1. A vortex pump 42, a vacuum pump 43, a water-gas separation tank 44, a feed valve 45 and a discharge valve 46 are fixedly installed on the base 41. The lower part of the water-gas separation tank 44 is provided with a feed port and a first discharge port, and the upper part of the water-gas separation tank 44 is provided with a second discharge port. A dirt-intercepting grid 47 is installed in the middle of the water-gas separation tank 44. The discharge end of the vortex pump 42 is connected to the feed port of the water-gas separation tank 44. The second discharge port of the water-gas separation tank 44 is connected to the vacuum pump 43. A confluence pipeline 5 is connected to the first discharge port of the water-gas separation tank 44. The discharge end of the confluence pipeline 5 is connected to the collection device. The discharge valve 46 is installed on the confluence pipeline 5. The interception net bag 3 is installed at the intake open channel of the nuclear power plant along the water flow direction. The large-mouth end of the interception net bag 3 is docked with the intake open channel of the nuclear power plant. A feed pipe 6 is connected to the small-mouth end of the interception net bag 3. The end of the feed pipe 6 far away from the interception net bag 3 is connected to the feed end of the vortex pump 42. The feed valve 45 is installed on the feed pipe 6.

[0024] In the above embodiment, before pumping seawater, first close the discharge valve 46, open the feed valve 45 and start the vacuum pump 43, so that a negative pressure is formed in the pump chamber of the vortex pump 42 and in the water-gas separation tank 44. The seawater is sucked into the pump chamber of the vortex pump 42 to submerge the impeller and is transported into the water-gas separation tank 44. When the water level in the water-gas separation tank 44 reaches the preset position, start the vortex pump 42 and close the vacuum pump, and at the same time open the discharge valve 46. The pumped seawater is directly transported to the collection device through the confluence pipeline 5 for subsequent filtration treatment. Since the fluid medium in the vortex pump 42 is isolated from the impeller in the pump, the vortex pump 42 has an anti-entanglement function, which can effectively avoid the risk of the belt-shaped marine organisms entangling the pump impeller and causing jamming. Moreover, a dirt-intercepting grid 47 is arranged in the water-gas separation tank 44, which can completely avoid the risk of marine organisms entering the vacuum pump 43 and causing the failure of the vacuum pump 43. At the same time, the setting of the floating row 1, the floating row limiting device and the feed pipe 6 enables the suction system arranged on the floating row 1 to adapt to different marine water levels and ensure its normal operation. Therefore, the suction system provided by the present application has the characteristics of simple structure and no clogging, and can continuously and uninterruptedly suck the marine biological medium in the circulating water interception net bag of the nuclear power plant. Compared with the prior art, the suction efficiency is higher.

[0025] In some embodiments, the floating row limiting device includes a first anchor block 21 and a first flexible connector 22. The first anchor block 21 is fixed at the bottom of the water. One end of the first flexible connector 22 is connected to the first anchor block 21, and the other end of the first flexible connector 22 is connected to the floating row 1, thereby limiting the movement range of the floating row 1 within a preset value.

[0026] In the above embodiment, two first anchor blocks 21 and two first flexible connectors 22 are provided, and the two first anchor blocks 21 are respectively located on both sides of the floating row 1. The floating row 1 is limited by the first flexible connector 22, so that the displacement range of the floating row 1 front and back, left and right, and the displacement range with the rise and fall of the seawater level are always limited within the preset value, and the size of the preset value here is directly proportional to the length of the first flexible connector 22.

[0027] In some embodiments, an interception net bag limiting device is also included, and the upper side of the interception net bag 3 is slidably connected to an external horizontal rod set on the water surface. The interception net bag limiting device includes a second anchor block 71, a second flexible connector 72 and a third anchor block 73. The second anchor block 71 and the third anchor block 73 are fixed to the bottom of the water along the direction of the water flow, and the third anchor block 73 is located in the downstream section of the second anchor block 71, one end of the second flexible connector 72 is connected to the second anchor block 71, and the other end of the second flexible connector 72 is connected to the upper side of the interception net bag slidably connected to the external horizontal rod.

[0028] In the above embodiment, the wide mouth end of the interception net bag 3 can be limited within a certain range by cooperating with the second anchor block 71, the second flexible connector 72 and the third anchor block 73. On the premise of ensuring that the interception net bag 3 has a certain interception range, the displacement range of the upper side of the interception net bag 3 is also limited. The displacement range of the interception net bag 3 is positively correlated with the length of the second flexible connector 72.

[0029] In some embodiments, a manual release device 8 is further included, and the small-mouth end of the interception net bag 3 is connected to the feed pipe 6 via the manual release device.

[0030] In the above embodiment, the small end of the intercepting net bag 3 is connected to the feed pipe 6 through the manual release device 8, which not only ensures the reliable connection performance between the two components, but also facilitates subsequent maintenance.

[0031] In some embodiments, a liquid level meter 48 and a pressure sensor 49 are further included. Both the liquid level meter 48 and the pressure sensor 49 are disposed in the water-gas separation tank 44 , and the liquid level meter 48 is located on the upper side of the trash grille 47 , and the pressure sensor 49 is located on the upper side of the liquid level meter 48 .

[0032] In the above embodiment, by setting the liquid level meter 48, it is possible to intuitively judge whether there is water in the water-gas separation tank 44, thereby providing a guarantee for the start of the vortex pump 42. The pressure sensor 49 is set to intuitively judge the pressure change in the water-gas separation tank 44, thereby ensuring the normal operation of the suction device.

[0033] In some embodiments, a check valve 9 is further included, wherein the check valve 9 is connected to the confluence pipe 5 and the check valve 9 is located between the discharge valve 46 and the collection device.

[0034] In the above embodiments, by providing the check valve 9, it is possible to effectively prevent the seawater mixture sucked from flowing back into the gas-liquid separation tank 44 through the manifold pipe 5.

[0035] In some embodiments, it further includes a flowmeter installed on the manifold pipe 5.

[0036] In the above embodiments, by means of the flowmeter provided on the manifold pipe 5, the flow rate of the seawater mixture extracted by the suction system can be observed in real time.

[0037] In the non-clogging suction system of the circulating water interception net bag in a nuclear power plant, the trash rack plays an important role in avoiding the risk of marine organisms entering the vacuum pump and causing the vacuum pump to malfunction. According to the technical solution of the present invention, the trash rack can be made of a corrosion-resistant and high-strength metal material, such as stainless steel (for example, 304 stainless steel, 2205 duplex stainless steel, etc.).

[0038] Preferably, the trash rack can be a flat trash rack or a cylindrical trash rack. The flat trash rack is integrally planar and consists of multiple parallel bars with a certain spacing between the bars. This structural design allows water flow to pass through the grille vertically, facilitating the interception of marine organisms and solid impurities. On the other hand, the cylindrical trash rack is cylindrical in shape, and its surface is covered with fine sieve holes. Water flow enters from one end of the cylinder and, during the flow inside the cylinder, marine organisms and solid impurities are intercepted on the surface of the cylinder, while the filtered water flows out from the other end of the cylinder. This structural design has a large filtration area and can process more circulating water per unit time, improving the interception efficiency.

[0039] According to the preferred implementation of the present invention, to further improve the performance of the trash rack, the surface of the trash rack is subjected to a modification treatment, in which a TiO2 / Al2O3 composite coating is prepared by magnetron sputtering technology. The thickness of this coating is controlled within 5 - 15 μm and has the characteristics of superhydrophilicity (contact angle <5°) and anti-biofouling, which can effectively solve many problems faced by existing trash racks. To achieve the above effects, the average particle sizes of TiO2 and Al2O3 are respectively in the range of 30 nm to 150 nm, preferably 50 nm to 100 nm.

[0040] Specifically, in a high-vacuum environment, magnetron sputtering technology uses an electric field to ionize inert gases such as argon to generate plasma. Under the combined action of an electric field and a magnetic field, argon ions in the plasma are accelerated and bombard the target materials (such as TiO2 target materials and Al2O3 target materials). The target atoms are sputtered out under the impact of argon ions and deposited on the surface of the intake grille to be treated, forming a uniform coating. The superhydrophilic property (contact angle < 5°) of the TiO2 / Al2O3 composite coating is of great significance for improving the performance of the intake grille. When the coating surface has superhydrophilicity, water can spread rapidly on its surface, forming a uniform water film. In the circulating water system of a nuclear power plant, this water film can play the following key roles: On the one hand, it can reduce the frictional resistance between the water flow and the grille surface. Due to the existence of the water film, when the water flow passes through the grille, it no longer directly contacts the solid substances on the grille surface, but slides on the water film, greatly reducing the friction coefficient and making the water flow pass through the grille more smoothly. This not only improves the circulation efficiency of the circulating water, reduces energy consumption, but also reduces the risk of marine organism aggregation caused by poor water flow. On the other hand, the superhydrophilic coating helps prevent marine organisms from attaching to the grille surface. When choosing an attachment site, marine organisms tend to settle on relatively dry and rough surfaces. The water film on the surface of the superhydrophilic coating forms an environment that is not conducive to the attachment of marine organisms, making it difficult for them to find a suitable attachment point on the grille surface. Even if some marine organisms try to attach, the lubricating effect of the water film makes it difficult for them to adhere firmly to the grille and they are easily washed away under the scouring of the water flow.

[0041] According to the technical solution of the present invention, in the TiO2 / Al2O3 composite coating, the weight ratio of TiO2 to Al2O3 is in the range of 1:3 to 1:6, preferably 1:4 to 1:6, and more preferably 1:4 to 1:5. The inventors of the present invention found in their research that when the weight ratio of TiO2 to Al2O3 is greater than 1:3, the relative content of Al2O3 decreases, the surface energy of the coating increases, the anti-biofouling performance weakens, and marine organisms are prone to attach and form a biofilm, clogging the grille and causing corrosion; at the same time, the superhydrophilic performance decreases, the frictional resistance of the water flow increases, the energy consumption increases and the organisms are more likely to aggregate. When the weight ratio is less than 1:6, the content of TiO2 is too low to inhibit the growth and attachment of organisms, and the formation of the biofilm accelerates; the synergistic effect between the two is destroyed, the stability of the coating decreases, it is prone to wear and fall off, affecting the stable operation of the system.

[0042] According to the technical solution of the present invention, the thickness of the TiO2 / Al2O3 composite coating is in the range of 5 μm to 15 μm, preferably 5 μm to 10 μm, and more preferably 5 μm to 8 μm. The inventors of the present invention found in the research that when the coating thickness is less than 5 μm, the superhydrophilic and anti-biofouling properties are difficult to be fully exerted. If the coating is too thin, a continuous and stable microstructure cannot be formed, resulting in insufficient surface hydrophilicity, increased water flow resistance, and reduced circulation efficiency of the circulating water. At the same time, the anti-biofouling ability is weakened, and marine organisms are likely to attach to the surface of the grille, accelerating the formation of biofilms, clogging the grille, and affecting the normal operation of the system. When the coating thickness is greater than 15 μm, the bonding strength between the coating and the substrate will decrease, and it is easy to fall off under the long-term scouring of water flow. Moreover, the too thick coating will increase the material cost, may also change the overall structural performance of the grille, affect its mechanical strength and stability, reduce the service life of the trash rack, and is not conducive to the efficient and stable operation of the circulating water system of the nuclear power plant. The above-mentioned superhydrophilic property of the TiO2 / Al2O3 composite coating can be regenerated by periodically irradiating with ultraviolet light, so the long-term performance can be achieved in a complex environment.

[0043] Without being bound by theory, it is believed that the TiO2 / Al2O3 composite coating achieves superhydrophilic and anti-biofouling properties through the following synergistic effects. TiO2 can produce a photocatalytic effect under ultraviolet light irradiation, break the adsorbed water molecules on the surface and form hydroxyl (-OH) groups, significantly improving the surface energy of the coating, and the water contact angle can be reduced to less than 5°. Al2O3, as an inert carrier, provides a rough and porous microstructure, further enhancing the surface hydrophilicity. The photocatalytic action of TiO2 can oxidize and destroy the adhesion proteins secreted by marine organisms (such as barnacle larvae, algae), and at the same time, the water film formed on the superhydrophilic surface can physically block biofouling. The high hardness and chemical stability of Al2O3 enhance the wear resistance of the coating and prevent the performance from decaying during long-term use. In addition, the superhydrophilic property of the coating can be regenerated by periodically irradiating with ultraviolet light (such as the ultraviolet germicidal lamp commonly used in nuclear power plants). The specific mechanism is as follows: Ultraviolet light excites TiO2 to generate electron-hole pairs, decomposes the organic substances (such as biological mucus, oil stains) adsorbed on the surface of the coating, restores the density of hydroxyl groups, and makes the contact angle drop below 5° again. After testing, after 50 ultraviolet light regeneration cycles, the attenuation of the superhydrophilic property of the coating is less than 10%, and it can operate stably in a complex marine environment (high salt, high biological load) for more than 5 years.

[0044] According to the technical solution of the present invention, the interception net bag is made of shape memory alloy and high-strength carbon fiber. The use of a composite material of intelligent shape memory alloy and high-strength carbon fiber can significantly improve the performance of the interception net bag. When the interception net bag is squeezed by marine organisms or debris, the shape memory alloy undergoes a martensitic phase transformation and produces plastic deformation. When the temperature rises above the end temperature of the austenite phase transformation, the shape memory alloy returns to the original austenite state, driving the net bag to restore its shape and maintain a good interception effect. On the other hand, high-strength carbon fibers are evenly distributed in the structure of the interception net bag and bear the main tensile load. Under the impact of water flow and the collision of marine organisms, carbon fibers rely on their excellent mechanical properties to prevent the net bag from being torn or over-stretched and deformed. Regarding shape memory alloys, TiNi alloys can be used, such as the TiNi50.8 alloy produced by Baoti Group. Regarding high-strength carbon fibers, T800-grade high-strength carbon fibers produced by Toray can be used. In the non-clogging suction system of the circulating water interception net bag of a nuclear power plant, the weight ratio of shape memory alloy to high-strength carbon fiber is generally more suitable between 1:3-1:5.

[0045] The specific preparation of the interception net bag may include the following steps. First, the TiNi alloy is processed into a filament shape, and the wire diameter is controlled at 0.1-0.3mm. The microstructure of the alloy is adjusted by a heat treatment process to optimize its shape memory performance. The alloy wire is kept at 500-600℃ for 1-2 hours in a vacuum environment, and then quickly cooled to room temperature. Separately, the T800-grade carbon fiber from Toray is surface treated to enhance its bonding with the shape memory alloy and subsequent coatings. Plasma treatment technology is used to introduce active groups on the surface of the carbon fiber. During the treatment, the carbon fiber is placed in a plasma treatment device and treated at a certain power for 5-10 minutes under a specific gas atmosphere (such as a mixed gas of argon and oxygen). Finally, a composite net bag is prepared by a weaving method, in which the pretreated shape memory alloy wire and the high-strength carbon fiber are interwoven according to the weaving pattern of the net bag. During the weaving process, the spacing and tension of the alloy wire and the carbon fiber are controlled to ensure uniform distribution. After the weaving is completed, a hot press curing treatment is performed. The temperature is kept at 150-200°C and the pressure is 5-10MPa for 30-60 minutes to make the two materials closely combined, thereby preparing an interception net bag with high interception effect. Optionally, a bionic nano antifouling coating is coated on the surface of the composite net bag, wherein the coating material is first prepared into a uniform solution, and the coating is evenly covered on the surface of the net bag by spraying. After spraying, it is dried and cured at room temperature for 24-48 hours to form a stable antifouling coating.

[0046] The present invention is described in more detail below in conjunction with the examples. It should be noted that these descriptions and examples are intended to facilitate the understanding of the present invention, rather than to limit the present invention. The protection scope of the present invention shall be subject to the attached claims.

[0047] Example

[0048] In the present invention, unless otherwise specified, the reagents used are all commercially available products and are used directly without further purification treatment.

[0049] Example 1: Preparation and performance testing of TiO2 / Al2O3 composite coating

[0050] Preparation, performance testing and long-term effectiveness verification of TiO2 / Al2O3 composite coating

[0051] 1. Coating preparation process

[0052] 1.1 Substrate pretreatment

[0053] Substrate selection: 304 stainless steel trash rack (size 100mm×100mm×2mm, mesh aperture 5mm), simulating the grille material and structure in actual applications.

[0054] Surface treatment:

[0055] The stainless steel trash rack was ultrasonically cleaned with acetone and ethanol for 15 minutes each to remove oil stains and organic substances, and then rinsed with deionized water.

[0056] 1.2 Magnetron sputtering deposition process

[0057] Using a JGP450 type magnetron sputtering device, the coating was deposited in a vacuum chamber, and the specific parameters are as follows:

[0058] Vacuum degree: Initial vacuum degree ≤ 5×10 -4 Pa;

[0059] Argon purity: 99.999%;

[0060] Argon flow rate: 25 sccm;

[0061] Sputtering power (TiO2 target): 180 W (DC sputtering);

[0062] Sputtering power (Al2O3 target): 120 W (RF sputtering).

[0063] 1.3 Ultraviolet light activation treatment

[0064] After deposition, the coating was placed under a UV-365 type ultraviolet lamp (wavelength 365 nm, power 50 mW / cm 2 ) and irradiated for 60 minutes to stimulate the hydroxylation of the TiO2 surface and further improve the hydrophilicity.

[0065] 2. Performance testing methods and standards

[0066] 2.1 Superhydrophilic performance testing

[0067] Contact angle measurement:

[0068] Instrument: DSA100 type contact angle measuring instrument (Germany );

[0069] Method: Drop 5 μL of deionized water on the surface of the coating, measure the contact angles at 3 different sites, and take the average value;

[0070] Regeneration test: After each ultraviolet light irradiation (365 nm, 50 mW / cm 2 ), repeat the measurement of the contact angle after 30 minutes.

[0071] 2.2 Anti-biofouling performance test

[0072] Experimental object: Barnacle larvae (Balanus amphitrite, larvae within 24 hours after hatching, density 1×10 4 individuals / L);

[0073] Experimental device: Self-made circulating water biofouling reactor (volume 5 L, water temperature 25±1°C, salinity 3.5%);

[0074] Test procedure:

[0075] Vertically immerse the coating sample in the reactor, with an exposed area of 50 cm 2 ; Continuously run for 30 days, change 1 / 3 of the water every day and supplement fresh barnacle larvae; after the experiment, rinse the surface of the sample with sterile seawater, dry it and weigh it to calculate the biofouling amount (mg / cm 2 ).

[0076] 2.3 Long-term performance test

[0077] Place the sample in 3.5% NaCl solution, perform ultraviolet light irradiation regeneration (30 minutes each time) every week, take out the sample to measure the contact angle and biofouling amount every month, and continuously test for 60 months.

[0078] 3. Experimental results and analysis

[0079] The performance comparison of coatings with different component ratios is shown in Table 1 below.

[0080] Table 1

[0081]

[0082]

[0083] As can be seen from the data in Table 1 above, the initial contact angles of all samples (A, B, C) are < 5° (A: 4.2°, B: 3.8°, C: 4.8°), meeting the superhydrophilic standard (contact angle < 5°). This indicates that the surfaces of the coatings can be quickly wetted by water, forming a uniform water film, which can effectively reduce the water flow resistance and physically block biological attachment.

[0084] In addition, after ultraviolet light regeneration, the contact angles of samples A, B, and C do not exceed 5°, remaining within the superhydrophilic range (< 5°). This shows that ultraviolet light irradiation can effectively restore the hydrophilicity of the coatings, proving that their superhydrophilic performance has long-term renewable properties and can meet the continuous use requirements in complex environments.

[0085] Regarding the anti-biological attachment performance, the 30-day biological attachment amounts of samples A, B, and C are significantly lower than those of the control examples (0.30 mg / cm for pure TiO2 2 , and 1.20 mg / cm for pure Al2O3 2 ).

[0086] Regarding the long-term effectiveness in complex environments, after 60 months of cyclic testing for samples A, B, and C: the coating thickness retention rate of B (1:4.5) > 95%, with no obvious wear or peeling; for A (1:3), due to the lower Al2O3 content, local wear causes a 15% thickness loss, but the substrate is not exposed; for C (1:6), peeling occurs at the edges (20% loss), but the coating in the main area is intact. From this, it can be seen that the above three coatings can maintain structural integrity in high-salt and high-water flow scouring environments and meet the long-term use requirements.

[0087] In addition, the contact angles of all samples remain below 5° (superhydrophilic critical value) within 60 months; the biological attachment amount does not exceed 0.15 mg / cm 2 (for the control sample of pure Al2O3, it reaches 1.20 mg / cm 2 ), which can prove that the superhydrophilic and anti-biological attachment performances have not undergone substantial attenuation. The above content can prove that regular ultraviolet light regeneration (once a month) can continuously remove the pollutants on the coating surface, maintain the active sites of TiO2, and ensure long-term performance.

[0088] The above has introduced in detail the non-clogging suction system for the nuclear power plant circulating water interception net pocket provided by this application. Specific examples are used in this article to elaborate on the principle and implementation method of this application. The description of the above embodiments is only used to help understand the core idea of this application. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of this application, several improvements and modifications can still be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. The non-clogging suction system for the circulating water interception net bag of a nuclear power plant is characterized in that It includes a floating raft, a floating raft limiting device, an interception net bag and a collection device. The floating raft floats on the water surface. The floating raft limiting device is connected to the floating raft and is used to limit the movement range of the floating raft within a preset value. A base is connected to the floating raft, and a vortex pump, a vacuum pump, a water-gas separation tank, a feed valve and a discharge valve are fixedly installed on the base. A feed port and a first discharge port are provided at the lower part of the water-gas separation tank, a second discharge port is provided at the upper part of the water-gas separation tank, and a sewage interception grid is installed in the middle of the water-gas separation tank. The discharge end of the vortex pump is connected to the feed port of the water-gas separation tank, the second discharge port of the water-gas separation tank is connected to the vacuum pump, the first discharge port of the water-gas separation tank is connected to a confluence pipeline, the discharge end of the confluence pipeline is connected to the collection device, the discharge valve is installed on the confluence pipeline. The interception net bag is installed at the intake channel of the nuclear power plant along the water flow direction. The large end of the interception net bag is docked with the intake channel of the nuclear power plant, and the small end of the interception net bag is connected with a feed pipe. The end of the feed pipe far away from the interception net bag is connected to the intake end of the vortex pump, and the feed valve is installed on the feed pipe. Wherein, the surface of the sewage interception grid is coated with a TiO2 / Al2O3 composite coating, and in the TiO2 / Al2O3 composite coating, the weight ratio of TiO2 to Al2O3 is in the range of 1:3 to 1:6, and the thickness of the TiO2 / Al2O3 composite coating is in the range of 5μm to 15μm.

2. The non-clogging suction system for the circulating water interception net bag of a nuclear power plant according to claim 1, wherein, The floating raft limiting device includes a first anchor block and a first flexible connector. The first anchor block is fixed on the bottom of the water, one end of the first flexible connector is connected to the first anchor block, and the other end of the first flexible connector is connected to the floating raft, thereby limiting the movement range of the floating raft within a preset value.

3. The clog-free suction system for the circulating water interception net bag of a nuclear power plant according to claim 2, wherein, It further includes an interception net bag limiting device. The upper side of the interception net bag is slidably connected to an external horizontal rod arranged on the water surface. The interception net bag limiting device includes a second anchor block, a second flexible connector and a third anchor block. The second anchor block and the third anchor block are fixed on the bottom of the water along the water flow direction, and the third anchor block is located in the downstream section of the second anchor block. One end of the second flexible connector is connected to the second anchor block, and the other end of the second flexible connector is connected to the upper side of the interception net bag slidably connected to the external horizontal rod.

4. The clog-free suction system for the circulating water interception net bag of a nuclear power plant according to claim 1, characterized in that, It further includes a manual release device. The small end of the interception net bag is connected to the feed pipe through the manual release device.

5. The non-clogging suction system for the circulating water interception net bag of a nuclear power plant according to claim 1, characterized in that, It further includes a liquid level gauge and a pressure sensor. The liquid level gauge and the pressure sensor are both arranged in the water-gas separation tank, and the liquid level gauge is located above the sewage interception grid, and the pressure sensor is located above the liquid level gauge.

6. The non-clogging suction system for the circulating water interception net bag of a nuclear power plant according to claim 1, wherein, It further includes a check valve. The check valve is connected to the confluence pipeline, and the check valve is located between the discharge valve and the collection device.

7. The non-clogging suction system for the circulating water interception net pocket of a nuclear power plant according to claim 1, characterized in that, It further includes a flow meter installed on the confluence pipeline.

8. The non-clogging suction system for the circulating water interception net bag of a nuclear power plant according to claim 1, characterized in that, The interception net bag is woven from shape memory alloy and carbon fiber.

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