Marine organism adhesion preventing water suction opening for offshore platform and working method

Abstract

The invention relates to the technical field of offshore platform water taking, in particular to a marine organism adhesion prevention water suction opening for an offshore platform and a working method. The water suction port is provided with a water suction body, the inner wall of the water suction body is a conical water suction channel, the conical water suction channel is provided with a large end and a small end, the side, facing seawater, of the large end is a water inlet end, and the small end is connected with a water suction pipeline of an offshore platform to form a water outlet end. The surface of the water absorption channel is provided with textures, the textures comprise microcosmic protrusions and groove structures, the surface of the water absorption channel is further coated with a silver ion antibacterial coating, and an ultrasonic generator is arranged in the water absorption body. The microbial attachment behavior is effectively inhibited, and the operation stability of the water taking system is improved.

Description

Technical Field

[0001] This invention relates to the field of water intake technology for offshore platforms, and in particular to a water intake port for offshore platforms to prevent marine organism attachment and its working method. Background Technology

[0002] In offshore platform operations, seawater intake systems provide water for critical equipment such as cooling devices and fire suppression systems. The core component, the intake port, is responsible for introducing external seawater into the platform's internal piping network. Traditional intake ports typically employ a simple open structure, relying on natural water flow to achieve their water intake function.

[0003] A common intake design is a cylindrical structure, consisting of a section of equal-diameter pipe with one end open to seawater and the other end connected to the platform's intake pipe. Seawater enters directly into the pipe through the open end and flows into subsequent systems via the platform's pump. This structure is simple and has low manufacturing costs, but because its inner wall surface is usually a smooth plane and lacks an active protection mechanism, it presents the following problems in practical use: Because seawater is rich in various microorganisms, the inner surface of the cylindrical intake provides a stable attachment environment for these microorganisms. For example, barnacles and oysters easily multiply and grow on the pipe wall, gradually forming a biofilm layer. This reduces the effective flow area of ​​the intake, decreasing the amount of seawater drawn in and consequently affecting the normal operation of related systems on the offshore platform. Maintaining the system's normal operation requires more energy to increase suction and for maintenance, increasing operating costs. Furthermore, microorganisms produce corrosive substances during metabolism, which can damage the intake material, shorten its lifespan, and increase the frequency of maintenance and replacement. This not only wastes manpower and resources but can also potentially affect the safe and stable operation of the offshore platform due to intake malfunctions. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a water intake for offshore platforms that prevents marine organism attachment and its operating method. By combining structural optimization with intelligent control, it effectively inhibits microbial attachment behavior and improves the operational stability of the water intake system.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions: A water intake for preventing marine organism attachment on an offshore platform, the water intake having a water intake body, the inner wall of the water intake body being a conical water intake channel, the conical water intake channel having a large end and a small end, the large end facing the seawater being the water inlet end, and the small end being connected to the water intake pipe of the offshore platform as the water outlet end; the surface of the water intake channel is textured, the texture including microscopic protrusions and groove structures, the surface of the water intake channel is also coated with a silver ion antibacterial coating, and an ultrasonic generator is disposed within the water intake body.

[0006] Optionally, the water intake is also equipped with a microbial monitoring sensor to monitor the adhesion of microorganisms on the surface of the water intake in real time.

[0007] Optionally, the diameter of the larger end is twice the diameter of the smaller end.

[0008] Optionally, the absorbent body is made of duplex stainless steel.

[0009] Optionally, the antibacterial coating is a polysiloxane alkyl composite coating.

[0010] Optionally, the outer wall surface and bottom end surface of the absorbent body are also provided with a textured structure.

[0011] This invention also provides a method for operating the above-described anti-marine biofouling intake for offshore platforms, comprising: The instantaneous flow velocity of seawater was collected from the inner side of the large end and the inner side of the small end; The velocity gradient is calculated based on the flow velocity at the large end and the flow velocity at the small end. The velocity gradient reflects the rate of change of the velocity of the water flow from the large end to the small end. Compare the flow velocity gradient with at least one preset threshold; Adjust the operating frequency and power of the ultrasonic generator based on the comparison results.

[0012] Optionally, the velocity gradient is calculated by dividing the velocity difference between the inner side of the large end and the inner side of the small end by the axial length of the absorbent body.

[0013] Optionally, adjusting the operating frequency of the ultrasonic generator includes: calculating the natural frequency of the texture based on the structural parameters of the texture and the material parameters of the absorbent body; and setting the operating frequency of the ultrasonic generator to a value related to the natural frequency according to the flow velocity gradient.

[0014] Optionally, adjusting the power of the ultrasonic generator includes: setting the power to a first power level when the flow velocity gradient is below a first threshold; setting the power to a second power level when the flow velocity gradient is between the first and second thresholds; and setting the power to a third power level when the flow velocity gradient is above the second threshold; wherein the first power level is higher than the second power level, and the second power level is higher than the third power level.

[0015] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: 1. The inner wall of the water intake of this invention forms a conical water intake channel, with the larger end serving as the water inlet facing the seawater and the smaller end serving as the water outlet connecting to the water intake pipe. This allows the seawater to flow from the larger end to the smaller end with a gradually increasing flow velocity, generating a strong scouring force that helps remove microorganisms attached to the inner wall. The surface texture includes microscopic protrusions and grooves, which create micro-eddies when water flows through, disrupting the stable environment required for microbial attachment. The silver ion antibacterial coating inhibits microbial growth through the antibacterial properties of silver ions, while the ultrasonic generator produces a cavitation effect, using the impact force of bursting bubbles to dislodge already attached microorganisms. The silver ion antibacterial coating and the turbulent interference of the texture create a dual anti-attachment effect of physical interference and chemical inhibition. The synergistic effect of the ultrasonic generator, the scouring of the conical channel, the turbulence of the texture, and the antibacterial action of the coating addresses the microbial attachment problem from two dimensions: prevention and removal of existing attachments. This extends the service life of the water intake and ensures the safe and stable operation of the offshore platform.

[0016] 2. This invention solves the problem of microbial residue during low-flow-rate periods by combining water flow scouring, texturing, and ultrasonic waves, while simultaneously reducing energy consumption during high-flow-rate periods. In the low-flow-rate range, turbulence is enhanced through the resonance of ultrasonic waves and texturing, combined with cavitation bubbles providing forward guidance. In the high-flow-rate range, the ultrasonic power is reduced to 20% of the rated power. Simultaneously, the low-power vibration reduces wear on the antibacterial coating on the inner wall, extending the coating's lifespan and lowering maintenance and replacement costs.

[0017] Advantages of additional aspects of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, the dimensions or spacing between the components are exaggerated to show the position of each component, and the schematic diagrams are for illustrative purposes only.

[0019] Figure 1 This is a schematic diagram of the inside of the water intake provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the water intake port provided in an embodiment of the present invention; Figure 3 This is a partial cross-sectional view of the water intake provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the bottom of the water intake provided in an embodiment of the present invention; In the diagram: 1. Water inlet; 2. Water absorption body; 3. Antibacterial coating; 4. Ultrasonic generator; 5. Water outlet; 6. Microbial monitoring sensor; 7. Groove; 8. Protrusion; Detailed Implementation It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Example 1 like Figure 1 As shown, this embodiment proposes a water intake for preventing marine biofouling on offshore platforms. The conical structure enhances water flow scouring, the texture interferes with attachment points, the coating inhibits growth at the source, and ultrasonic waves provide auxiliary cleaning, collectively solving the problem of microbial attachment. The water intake has a water intake body 2, the inner wall of which is a conical water intake channel. This conical water intake channel has a large end and a small end. The large end facing the seawater is the water inlet 1, and the small end connects to the water intake pipe of the offshore platform as the water outlet 5. The inner surface of the water intake channel is textured (for clarity, the inner wall texture is not shown in the diagram; only the texture of the outer surface of the water intake is shown, such as...). Figure 2 As shown in the figure, the texture includes microscopic protrusions 8 and grooves 7, and the surface of the water absorption channel is also coated with a silver ion antibacterial coating 3. An ultrasonic generator 4 is provided inside the water absorption body 2.

[0021] Seawater flows in from the larger end and then along the conical channel towards the smaller end, with the water velocity gradually increasing. The conical channel design accelerates the water flow, generating a scouring force that directly washes away some microorganisms attached to the channel surface, solving the problems of insufficient scouring force and easy microbial attachment in traditional water inlets. The texture on the channel surface creates micro-turbulence as seawater flows, disrupting the stable environment required for microbial attachment. This, combined with the scouring force of the conical channel, further reduces microbial attachment. The silver ion antibacterial coating 3 destroys the structure of microbial cells through the reaction of silver ions, inhibiting microbial growth at the source. This, along with the turbulent interference of the texture, creates a dual anti-attachment effect of physical interference and chemical inhibition. The ultrasonic generator 4 inside the water-absorbing body 2 generates a cavitation effect when working. The impact force generated by the formation and collapse of bubbles can dislodge attached microorganisms. This, combined with the scouring of the conical channel, the turbulence of the texture, and the antibacterial effect of the coating, addresses the problem of microbial attachment from two dimensions: prevention and removal of existing attachments.

[0022] like Figure 2 , Figure 4 As shown, the water intake is also equipped with a microbial monitoring sensor 6, which is used to monitor the adhesion of microorganisms on the surface of the water intake in real time, avoiding the lag problem of manual periodic inspection. When the amount of microorganisms detected exceeds the set threshold, the control center can promptly control the ultrasonic generator 4 to start or issue a manual maintenance alarm.

[0023] The diameter of the large end is twice that of the small end, and the length of the conical channel is 2.5 times the diameter of the small end, with a cone angle of approximately 35°. Setting the diameter ratio of the large end to the small end to 2 allows seawater to flow in from the large end and accelerate smoothly along the inner wall of the channel, reducing the adhesion of microorganisms. The 2.5 times diameter of the conical channel ensures sufficient acceleration distance for the water flow, allowing the water velocity at the small end outlet to effectively flush away microorganisms. Simultaneously, it avoids excessive channel length leading to increased water flow resistance, thus balancing flushing force and water absorption efficiency.

[0024] The water-absorbing body 2 is made of duplex stainless steel. Seawater contains high concentrations of salt and corrosive substances produced by microbial metabolism. The corrosion resistance of duplex stainless steel can prevent the body from being rapidly corroded after the coating is damaged, thus extending the service life of the entire water intake. At the same time, the mechanical strength of duplex stainless steel can support the structural stability of the conical water intake channel, making it less prone to deformation under seawater pressure, thus maintaining the water flow acceleration effect and scouring force.

[0025] The antibacterial coating 3 is a polysiloxane alkyl composite coating with a silver ion content of 1.05% and a coating thickness of 10 μm. The polysiloxane alkyl composite coating exhibits excellent adhesion and seawater erosion resistance. Its high adhesion ensures a tight bond to the surface of the water absorption channels, preventing detachment even under prolonged seawater erosion and ultrasonic vibration. The 1.05% silver ion content effectively inhibits microbial growth and reproduction by reacting with and disrupting the structure of microbial cells. A coating thickness of 10 μm forms a complete coverage layer without gaps or missed areas.

[0026] like Figure 2 , Figure 3 , Figure 4 As shown, the outer wall surface and bottom end face of the absorbent body 2 are also provided with textured structures, micron-level spiral grooves 7, with a groove width of 0.8 mm, a groove depth of 0.4 mm, and a pitch of 50 mm.

[0027] The outer wall and bottom end face are areas where microorganisms attach, which are often overlooked by traditional water inlets. The textured structure of the outer wall, together with the texture and conical structure of the inner wall, achieves uniform protection of the inner and outer surfaces, reduces dead corners for attachment, and improves overall cleaning efficiency.

[0028] In summary, the conical design allows seawater to flow smoothly along the inner wall of the intake, with the flow speed gradually increasing from the larger end to the smaller end. This rapid flow generates a strong scouring force, effectively washing away microorganisms attached to the inner wall of the intake, achieving a self-cleaning function and reducing microbial adhesion. The micro-textured structure creates minute turbulence as seawater flows through it. This turbulence disrupts the stable water flow environment required for microbial attachment, making it difficult for microorganisms to find suitable attachment points on the intake surface. Furthermore, the texture disrupts the smooth surface needed for marine organism attachment, further reducing the likelihood of microbial adhesion. The antibacterial coating 3 contains antibacterial components such as silver ions. Silver ions have excellent antibacterial properties, inhibiting the growth and reproduction of microorganisms. When microorganisms come into contact with the intake surface coated with antibacterial coating 3, the silver ions react with the microbial cells, destroying their cellular structure, thereby achieving an antibacterial effect and reducing microbial adhesion to the intake surface at its source. The ultrasonic generator 4 periodically emits ultrasonic waves, which create a cavitation effect as they propagate in water. This cavitation effect generates numerous tiny bubbles in the water. The formation and collapse of these bubbles produce a powerful impact force that acts on the inner wall and surface of the intake, dislodging any attached microorganisms and further improving the cleanliness of the intake. A microbial monitoring sensor 6 is installed near the main unit. This sensor monitors the adhesion of microorganisms to the surface of the intake in real time and transmits the data to the control center. When the amount of attached microorganisms exceeds a set threshold, the control center automatically activates the ultrasonic generator 4 to perform cleaning; or it issues an alarm to remind staff to perform manual maintenance.

[0029] When installing the intake on an offshore platform, first, seal the small end of the intake unit to the platform's intake pipe, ensuring a secure and leak-free connection. Then, position the large end of the intake unit towards the seawater, allowing the intake to fully contact the seawater. Next, install the microbial monitoring sensor 6 and the ultrasonic generator 4, and connect them to the control center to ensure normal signal transmission and proper equipment operation. Finally, debug the entire intake system and check the operation of each component.

[0030] When the offshore platform's water intake system is activated, seawater flows in from the larger end of the intake. The seawater flows along the inner wall of the conical body towards the smaller end, gradually increasing in velocity and scouring the inner wall. Simultaneously, the seawater creates micro-turbulence as it flows over the textured outer surface, reducing microbial adhesion. The antibacterial coating 3 continuously exerts its antibacterial effect, inhibiting microbial growth. Microbial monitoring sensors 6 monitor microbial adhesion in real time. When the adhesion exceeds a threshold, the control center activates the ultrasonic generator 4, emitting ultrasonic waves to dislodge microorganisms using cavitation.

[0031] The conical structure optimizes the water flow path, allowing seawater to flow more smoothly into the intake, improving water intake efficiency and reducing energy consumption.

[0032] Through the self-cleaning effect of the cone-shaped structure, the interference of surface texture on water flow, the antibacterial properties of the antibacterial coating 3, and the auxiliary cleaning of the ultrasonic generator 4, the adhesion of microorganisms on the surface of the water intake is effectively reduced, ensuring the cleanliness of the water intake.

[0033] The microbial monitoring sensor 6 enables real-time monitoring and intelligent control of microbial adhesion at the intake port, allowing for timely detection of problems and corresponding measures, reducing manual maintenance costs, and improving the reliability and stability of the offshore platform's water intake system.

[0034] Example 2 During low flow rates, the water flow scouring force of the conical structure is weak, and the turbulence intensity generated by the surface texture is insufficient. Relying solely on fixed-power ultrasonic cleaning can easily lead to uneven coverage due to cavitation effects, resulting in microbial residue on the inner wall of the intake and in the grooves of the texture. Long-term accumulation will reduce the water flow area. During high flow rates, the water flow scouring force and texture turbulence can effectively inhibit microbial adhesion. If high-power ultrasonic cleaning is still maintained, it will cause unnecessary energy consumption.

[0035] To address the aforementioned problems, this embodiment provides a method for operating the aforementioned anti-marine biofouling intake for offshore platforms, comprising: The instantaneous flow velocity of seawater was collected from the inner side of the large end and the inner side of the small end; The velocity gradient is calculated based on the flow velocity at the large end and the flow velocity at the small end. The velocity gradient reflects the rate of change of the velocity of the water flow from the large end to the small end. Compare the flow velocity gradient with at least one preset threshold; Adjust the operating frequency and power of the ultrasonic generator based on the comparison results.

[0036] Collecting instantaneous flow velocities at both ends provides a comprehensive understanding of the water flow within the intake, avoiding the inaccurate assessment of scouring force caused by traditional methods that only monitor flow velocity at a single location. The velocity gradient directly reflects the acceleration of the water flow from the larger end to the smaller end; the magnitude of the gradient is directly related to the strength of the scouring force, providing a quantitative basis for subsequent adjustments to ultrasonic parameters. Adjusting the ultrasonic frequency and power based on the comparison between the gradient and preset thresholds allows the ultrasonic generator's operating state to adapt to the current water flow scouring force. For example, enhancing the ultrasonic effect at low velocity gradients and reducing ultrasonic power at high velocity gradients addresses the issues of microbial residue during low flow periods and energy waste during high flow periods.

[0037] The velocity gradient is calculated by dividing the velocity difference between the inner side of the large end and the inner side of the small end by the axial length of the water intake body. This accurately quantifies the acceleration of the water flow in the intake port, providing accurate data for subsequent comparison with the preset threshold, and ensuring that the adjustment of the ultrasonic generator parameters is based on quantitative indicators that fit the actual scouring situation.

[0038] Adjusting the operating frequency of the ultrasonic generator includes: calculating the natural frequency of the texture based on the structural parameters of the texture and the material parameters of the absorbent body; and setting the operating frequency of the ultrasonic generator to a value related to the natural frequency according to the flow velocity gradient.

[0039] The natural frequency of a texture is determined by its structure and material composition. Different ultrasonic frequencies need to be set for different flow velocity gradients to match the turbulence effect of the texture. Calculating the natural frequency using texture structure parameters and material parameters ensures that the frequency calculation results accurately reflect the vibration characteristics of the texture. The ultrasonic frequency, which is related to the natural frequency, is then set according to the flow velocity gradient.

[0040] Adjusting the power of the ultrasonic generator includes: setting the power to a first power level when the flow velocity gradient is below a first threshold; setting the power to a second power level when the flow velocity gradient is between the first and second thresholds; and setting the power to a third power level when the flow velocity gradient is above the second threshold. The first power level is higher than the second power level, and the second power level is higher than the third power level.

[0041] Adjusting the power levels allows for precise matching of the ultrasonic generator's power output to the current water flow's scouring force. At low flow velocity gradients, where the scouring force is weak, the first power level enhances the ultrasonic cavitation effect, generating a stronger impact to dislodge microorganisms and address the issue of microbial residue during low flow periods. At medium flow velocity gradients, where the scouring force and textural turbulence are moderate, the second power level reduces energy consumption while maintaining anti-adhesion effects. At high flow velocity gradients, where the scouring force is strong, the third power level maintains only slight vibration, preventing component aging caused by prolonged idleness of the ultrasonic generator and avoiding unnecessary energy waste.

[0042] This adjustment method works in conjunction with the flow velocity gradient, where the strength of the scouring force reflected by the gradient determines the power output, enabling on-demand power supply. It also works in conjunction with the frequency adjustment of the ultrasonic generator, matching frequency and power. For example, at low flow velocities, a resonant frequency plus high power enhances turbulence and cavitation effects, while at high flow velocities, a specific frequency plus low power protects the equipment and saves energy.

[0043] Specific steps: S1 acquires auxiliary data on flow velocity and sea state. Due to the variable diameter acceleration characteristic of the conical intake, a single flow velocity cannot accurately reflect the overall scouring effect of the water flow on the intake. Therefore, the instantaneous flow velocities of seawater on the inner side of the large end and the inner side of the small end are collected in real time and recorded as the large end velocity v1 and the small end velocity v2, respectively.

[0044] S2 calculates the velocity gradient based on the collected flow velocity data, solving the problem that a single flow velocity cannot accurately reflect the distribution of scouring force, and ensuring that the coordinated strategy of water scouring, texture, and ultrasound can adapt to different water flow states. The velocity gradient G reflects the rate of change of water velocity from the large end to the small end, and is calculated by the formula G=(v2-v1) / L, where L is the axial length of the imitation cone body, and v1 and v2 are the real-time flow velocity data of the large and small ends collected in the first step. The G value calculated by this formula can intuitively reflect the strength of the current water scouring force. The larger the G value, the more obvious the acceleration of the water flow from the large end to the small end, and the stronger the scouring force of the water flow on the inner wall of the suction port.

[0045] S3 matches corresponding scouring, texturing, and ultrasonic collaborative strategies based on the numerical range of the flow velocity gradient G. First, G is divided into three intervals, corresponding to flow velocity scenarios during different tidal periods: G < 0.2s -1 This is a low-velocity range, mainly corresponding to the slack tide period; 0.2s -1 ≤G≤0.5s -1 This is the medium current velocity range, mainly corresponding to the early stages of high and low tide; G > 0.5s -1 This is the high-velocity zone, primarily corresponding to the peak tide during low tide. Differentiated collaborative control strategies are developed for different zones: At low flow rates, the scouring force of the water flow is weak, and the turbulence intensity generated by the surface texture is insufficient. Therefore, the anti-adhesion effect needs to be enhanced through the synergistic effect of ultrasound and texture. First, the natural frequency f of the surface texture is determined. f is calculated using the structural parameters of the texture protrusions, as shown in the formula: ; Wherein, k is a coefficient, determined through multiple sets of experimental tests. For the textured structure of this suction port with a groove width of 0.8mm and a groove depth of 0.4mm, the value of k is taken as 0.8; E is the elastic modulus of the imitation cone-shaped body material. For example, the suction port is made of duplex stainless steel, and its E value is 200GPa; ρ is the density of duplex stainless steel, with a value of 7800kg / m³; h is the height of the texture protrusion, which is 0.2mm in height. After calculating f, the operating frequency of the ultrasonic generator is adjusted to f to make the ultrasonic vibration resonate with the texture, enhancing the water flow disturbance near the texture and increasing the turbulence intensity. At the same time, the ultrasonic power is set to 70% of its rated power to avoid excessive dispersion of cavitation bubbles due to excessive power.

[0046] In the medium flow velocity range, the water flow scouring force and texture turbulence intensity are moderate, and ultrasonic waves only need to assist in meeting the anti-adhesion requirements. Adjusting the ultrasonic generator's operating frequency to 1.2 times f avoids excessive vibration caused by resonance while maintaining a certain cavitation effect. Setting the ultrasonic power to 50% of its rated power allows for low-frequency, medium-power ultrasonic waves to assist texture turbulence in disrupting the initial adhesion of microorganisms, which are then carried away by the water flow, without excessive energy consumption.

[0047] At high flow rates, the strong scouring force of the water flow and the turbulence generated by the surface texture effectively inhibit microbial adhesion, and the ultrasonic waves only need to remain in standby mode. Reducing the ultrasonic power to 20% of its rated power and adjusting the operating frequency to 10kHz, at which frequency the cavitation effect is weak, producing only slight vibrations, primarily serves to prevent component aging caused by prolonged inactivity of the ultrasonic generator. At this point, water scouring and texture turbulence are the main anti-adhesion methods, utilizing the strong scouring force at high flow rates to directly remove microorganisms attempting to adhere, thus reducing ultrasonic energy consumption.

[0048] While the specific embodiments of the present invention have been described above, they are not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A water intake for preventing marine organism attachment on offshore platforms, characterized in that, The water intake has a water intake body, the inner wall of which is a conical water intake channel. The conical water intake channel has a large end and a small end. The large end facing the seawater is the water inlet, and the small end is connected to the water intake pipe of the offshore platform as the water outlet. The surface of the water absorption channel is textured, including microscopic protrusions and grooves. The surface of the water absorption channel is also coated with a silver ion antibacterial coating. An ultrasonic generator is installed inside the water absorption body.

2. The water intake for preventing marine biofouling on offshore platforms as described in claim 1, characterized in that, The water intake is also equipped with a microbial monitoring sensor to monitor the adhesion of microorganisms on the surface of the water intake in real time.

3. The water intake for preventing marine biofouling on offshore platforms as described in claim 1, characterized in that, The diameter of the larger end is twice the diameter of the smaller end.

4. The water intake for preventing marine biofouling on offshore platforms as described in claim 1, characterized in that, The absorbent body is made of duplex stainless steel.

5. The water intake for preventing marine biofouling on offshore platforms as described in claim 1, characterized in that, The antibacterial coating is a polysiloxane alkyl composite coating.

6. The water intake for preventing marine biofouling on offshore platforms as described in claim 1, characterized in that, The outer wall surface and bottom end face of the absorbent body are also provided with textured structures.

7. A method for operating a marine biofouling-resistant intake for an offshore platform as described in any one of claims 1-6, characterized in that, include: The instantaneous flow velocity of seawater was collected from the inner side of the large end and the inner side of the small end; The velocity gradient is calculated based on the flow velocity at the large end and the flow velocity at the small end. The velocity gradient reflects the rate of change of the velocity of the water flow from the large end to the small end. Compare the flow velocity gradient with at least one preset threshold; Adjust the operating frequency and power of the ultrasonic generator based on the comparison results.

8. The working method as described in claim 7, characterized in that, This includes: the velocity gradient is calculated by dividing the velocity difference between the inner side of the large end and the inner side of the small end by the axial length of the water-absorbing body.

9. The working method as described in claim 7, characterized in that, Adjusting the operating frequency of the ultrasonic generator includes: The inherent frequency of the texture is calculated based on the structural parameters of the texture and the material parameters of the absorbent body. The operating frequency of the ultrasonic generator is set to a value related to its natural frequency based on the flow velocity gradient.

10. The working method as described in claim 7, characterized in that, Adjusting the power of the ultrasonic generator includes: When the flow velocity gradient is below the first threshold, the power is set to the first power level; When the velocity gradient is between the first threshold and the second threshold, the power is set to the second power level; When the velocity gradient is higher than the second threshold, the power is set to the third power level; Among them, the first power level is higher than the second power level, and the second power level is higher than the third power level.

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