Marine organism adhesion prevention treatment system and method of offshore converter station water treatment system

Abstract

The invention relates to a marine organism adhesion prevention treatment system and method for a water treatment system of an offshore converter station, and the system is characterized in that the system comprises a seawater filtering unit, a sodium hypochlorite solution generating unit, a monitoring unit and a sound wave generating unit, and the sodium hypochlorite solution generating unit and the sound wave generating unit act on the front end of a seawater pump; through mutual cooperation of different treatment units, the sterilization effect is enhanced, and drug resistance of part of organisms is avoided. Meanwhile, various sterilization devices are matched with one another, and different sterilization modes are adopted according to different environmental working conditions, so that the energy consumption is reduced, and the situation that the cleaning cost is increased due to the fact that seawater pipelines are rapidly polluted due to faults of a single treatment system is avoided. The system can effectively prevent and remove attachment of various marine organisms, guarantee efficient, safe and long-term stable operation of the system, reduce the influence on the environment to the greatest extent, realize intelligent management and reduce manual intervention.

Description

Technical Field

[0001] This invention specifically relates to a system and method for preventing marine organism attachment in a water treatment system of an offshore converter station, belonging to the field of offshore wind power flexible DC transmission technology. Background Technology

[0002] As an auxiliary device for offshore converter stations, the seawater cooling system (water treatment system) cools the converter valves to ensure stable operation of the valve assembly. Offshore converter stations operate in eutrophic marine environments, making the pipes and equipment of the seawater cooling system and fire-fighting water system highly susceptible to attachment by marine organisms (such as barnacles, mussels, oysters, tube worms, algae, and hydra). The proliferation of marine organisms leads to: reduced effective flow cross-sectional area in the pipes, increased flow resistance, and a significant decrease in heat exchange efficiency; increased pump energy consumption; accelerated metal corrosion; blockage of filters, valves, nozzles, and heat exchanger tube bundles; and in severe cases, even system shutdown, threatening the safe and stable operation of the converter station and causing huge economic losses.

[0003] Patent CN202411043965.9 discloses a marine organism control injection system for submersible pumps on offshore platforms, proposing a chemical dosing scheme for marine organism control, which can achieve continuous protection of non-operating submersible pumps with a controllable low concentration of marine organism control agents. However, its effectiveness in controlling marine organisms is insufficient in the face of high flow rates, large water volumes, or specific organisms (such as certain shellfish larvae), and it does not mention a comprehensive method for the control of marine organisms.

[0004] Therefore, there is an urgent need for a comprehensive management solution that is efficient, environmentally friendly, low-maintenance, highly adaptable, and intelligent, specifically designed to address the problem of marine organism attachment in the complex water systems of offshore converter stations. Summary of the Invention

[0005] The purpose of this invention is to provide a system and method for preventing marine organism attachment in the water treatment system of an offshore converter station. This system can effectively prevent and remove various marine organisms, ensure the efficient, safe, and long-term stable operation of the system, minimize the impact on the environment, and achieve intelligent management with reduced human intervention.

[0006] To achieve the above objectives, the first technical solution of the present invention is: a marine biofouling prevention and control system for a water treatment system of an offshore converter station, the innovation of which lies in: including a seawater filtration unit, a sodium hypochlorite solution generating unit, a monitoring unit, and a sound wave generating unit.

[0007] The seawater filtration unit includes a seawater pump, a coarse filter, and a self-cleaning filter. The outlet of the seawater pump is connected to the inlet of the coarse filter, the outlet of the coarse filter is connected to the inlet of the self-cleaning filter, and the outlet of the self-cleaning filter is connected to an external seawater cooling system.

[0008] The sodium hypochlorite solution generating unit includes an electrolysis device, a sodium hypochlorite storage tank, and a dosing pump. The outlet of the self-cleaning filter is also connected to the inlet of the electrolysis device. The outlet of the electrolysis device is connected to the inlet of the sodium hypochlorite storage tank. The outlet of the sodium hypochlorite storage tank is connected to the inlet of a seawater pump via the dosing pump.

[0009] The monitoring unit includes a first pressure transmitter, a second pressure transmitter, a temperature transmitter, a residual chlorine transmitter, a flow transmitter, and a comprehensive control cabinet. The first pressure transmitter is installed on the pipeline between the seawater pump and the coarse filtration unit, and the second pressure transmitter is installed on the pipeline between the coarse filtration unit and the self-cleaning filter. The first pressure transmitter, second pressure transmitter, temperature transmitter, residual chlorine transmitter, and flow transmitter are electrically connected to their respective connection terminals in the comprehensive control cabinet.

[0010] The acoustic wave generating unit includes a rectifier cabinet and an acoustic wave transducer. The acoustic wave transducer is located on one side of the seawater pump, and the rectifier cabinet supplies power to the electrolysis device and the acoustic wave transducer.

[0011] The seawater pump, coarse filter, self-cleaning filter, dosing pump, and acoustic transducer are electrically connected to their respective connection terminals in the integrated control cabinet, and the rectifier cabinet is electrically connected to the integrated control cabinet.

[0012] In the first technical solution mentioned above, the seawater pump is located below sea level, and the outer periphery of the seawater pump is provided with a protective sleeve that isolates it from the seawater environment.

[0013] In the first technical solution described above, the seawater pump protective sleeve includes a sleeve housing, an acoustic transducer mounting plate, a reagent dosing distribution plate, and a filter grid / screen.

[0014] The sleeve housing is equipped with an acoustic transducer mounting plate, and the seawater pump is located inside the sleeve housing. The acoustic transducer is mounted on the acoustic transducer mounting plate.

[0015] The sleeve housing is also equipped with a reagent dosing distribution plate, which is used to evenly add the sodium hypochlorite solution delivered by the dosing pump to the front inlet of the seawater pump.

[0016] The bottom of the sleeve housing is provided with a filter grid / screen for intercepting pollutants and marine organisms, and the agent dosing distribution plate is located between the acoustic transducer mounting plate and the filter grid / screen.

[0017] In the first technical solution mentioned above, the outlet of the self-cleaning filter is connected to the seawater cooling system via a seawater pipeline to the user side, so that the seawater after double filtration enters the seawater side of the seawater cooling system for circulation.

[0018] In the first technical solution described above, the outlet of the self-cleaning filter is connected to the inlet of the electrolysis device via the seawater pipeline of the sodium hypochlorite generator.

[0019] In the first technical solution described above, the dosing pump delivers sodium hypochlorite solution to the inlet of the seawater pump via a sodium hypochlorite dosing pipeline.

[0020] In the first technical solution mentioned above, the acoustic transducer is also electrically connected to the corresponding connection terminal of the integrated control cabinet via an electrical wiring harness.

[0021] In the first technical solution mentioned above, the coarse filter device has an automatic backwashing function, and the filtration accuracy of the coarse filter device is not less than 1mm.

[0022] In the first technical solution mentioned above, the self-cleaning filter has an automatic backwashing function, and the filtration accuracy of the self-cleaning filter is not less than 500 micrometers.

[0023] In the first technical solution mentioned above, the electrolysis device is composed of two electrolysis devices connected in parallel, and the two electrolysis devices form a standby and one-in-use structure.

[0024] In the first technical solution mentioned above, the dosing pump is composed of two metering pumps connected in parallel, and the two metering pumps form a standby and one-in-use structure.

[0025] In the first technical solution mentioned above, the acoustic transducer converts direct current into low-frequency ultrasonic waves, with a frequency range of 20-50kHz.

[0026] To achieve the above objectives, the second technical solution of the present invention is: a method for preventing marine biofouling in a water treatment system for an offshore converter station, comprising a system for preventing marine biofouling in the water treatment system for an offshore converter station, the innovation of which lies in the following specific treatment steps:

[0027] The upper limit value ΔP_set2 and the lower limit value ΔP_set1 of the pressure difference between the inlet and outlet of the coarse filter are preset by the integrated control cabinet.

[0028] The inlet and outlet pressures of the coarse filtration unit are monitored by a first pressure transmitter and a second pressure transmitter. The integrated control cabinet obtains the actual inlet and outlet pressure difference ΔP of the coarse filtration unit based on the monitored inlet and outlet pressures.

[0029] If ΔP < ΔP_set1, the seawater pumped out by the seawater pump undergoes dual filtration through a coarse filter and a self-cleaning filter before being circulated into the seawater side of the seawater cooling system.

[0030] A portion of the seawater output from the self-cleaning filter is fed into an electrolysis device for electrolysis, generating a sodium hypochlorite solution that can sterilize seawater. This solution is then stored in a sodium hypochlorite storage tank, and a dosing pump delivers the sodium hypochlorite solution to the inlet of a seawater pump.

[0031] If ΔP_set1 ≤ ΔP < ΔP_set2, the system is in a high-load / high-risk state. The integrated control cabinet controls the coarse filter to start the backwashing or cleaning function and issues an alarm message.

[0032] If ΔP ≥ ΔP_set2, the system is clogged and in a high-load / high-risk state. The integrated control cabinet controls the coarse filter to start the backwashing or cleaning function, simultaneously issuing a "system load reduction" request and interlocking to reduce the operating frequency of the seawater pump. The acoustic transducer emits ultrasonic waves to suppress slime and works synergistically with the sodium hypochlorite solution to achieve enhanced treatment of marine organisms and decontamination of seawater.

[0033] When the system is under high load / high risk, the integrated control cabinet controls the acoustic transducer to operate at rated power, adjusts the current of the electrolysis unit and controls the flow rate of the dosing pump, and the sodium hypochlorite solution generating unit operates at maximum output. At this time, the target residual chlorine concentration C of the sodium hypochlorite solution is... TRC The concentration is 0.5-0.7 mg / L.

[0034] In the second technical solution mentioned above, when ΔP < ΔP_set1, the integrated control cabinet monitors the seawater temperature T and the target residual chlorine concentration C of the sodium hypochlorite solution in real time through temperature transmitters, residual chlorine transmitters, and flow transmitters. TRC and the actual seawater flow rate Q output by the seawater pump cw ,

[0035] If Q cw With a concentration of <30% Q_design and a seawater temperature T <10℃, the system is under high load / high risk. The integrated control cabinet controls the acoustic transducer to operate at rated power, adjusts the current of the electrolysis unit, and controls the flow rate of the dosing pump. The sodium hypochlorite solution generating unit operates at maximum output. At this time, the target residual chlorine concentration C of the sodium hypochlorite solution is... TRC The concentration is 0.5-0.7 mg / L, where the rated seawater flow rate of the seawater pump is Q_design.

[0036] If 30%·Q_design<Q cw<80%·Q_design, and seawater temperature 10℃<T<25℃, the system is in medium load / standard state. The integrated control cabinet controls the acoustic transducer to operate at rated power, adjusts the current of the electrolysis device and controls the flow rate of the dosing pump. The sodium hypochlorite solution exhibits PID control, and the target residual chlorine concentration C TRC The concentration is 0.3-0.5 mg / L.

[0037] If Q cw With a concentration >80%·Q_design and a seawater temperature T >25℃, the system is in a low-load / low-risk state. The integrated control cabinet controls the acoustic transducer to reduce its frequency and operate in energy-saving mode, adjusts the current of the electrolysis unit and controls the flow rate of the dosing pump, so that the sodium hypochlorite solution is maintained at the minimum dosage or continuously added, and the target residual chlorine concentration C is achieved. TRC It is 0.2 mg / L.

[0038] In the second technical solution described above, the first pressure transmitter and the second pressure transmitter monitor the inlet and outlet pressures of the coarse filter device, respectively, as P. in and P out The formula for calculating the actual inlet and outlet pressure difference ΔP of the coarse filtration device is as follows:

[0039] ΔP=P in -P out

[0040] The unit of ΔP is kPa or bar.

[0041] In the second technical solution described above, the calculation of the sodium hypochlorite solution dosage, i.e., the output flow rate of the dosing pump, is as follows:

[0042]

[0043] Among them, Q NaClO Required sodium hypochlorite solution dosage, in L / h.

[0044] Q cw The actual seawater flow rate of the seawater pump, in meters per second (m³). 3 / h,

[0045] C TRC Target residual chlorine concentration, in g / m³ 3 That is, mg / L.

[0046] ε: Current efficiency of the electrolysis device.

[0047] ρ: Density of sodium hypochlorite solution

[0048] % active : Effective concentration of sodium hypochlorite solution.

[0049] In the second technical solution described above, the current efficiency ε of the electrolysis device is 0.7-0.85, the density ρ of the sodium hypochlorite solution is approximately 1.02 kg / L, and the effective concentration % of the sodium hypochlorite solution is... active It is 6-10 g / L.

[0050] In the second technical solution described above, the formula for calculating the DC current of the electrolysis device is as follows:

[0051] I_set=(Q NaClO % active ) / (k·ε)

[0052] Where k is the yield of the electrolysis unit, and the unit is kg / (kA·h), which means the number of kilograms of available chlorine that can be produced per kA current for one hour of operation.

[0053] In the second technical solution mentioned above, the dosing mode of the dosing pump includes impact dosing and continuous dosing. The time interval of impact dosing and the time of continuous dosing are set by the integrated control cabinet. When the system is in a low load / low risk state, the dosing pump operates in the continuous dosing mode. When the system is in a high load / high risk state, the dosing pump operates in the impact dosing mode.

[0054] The positive effects of this invention are: the marine biofouling prevention and control system and method of the offshore converter station water treatment system of this invention includes a seawater filtration unit, a sodium hypochlorite solution generating unit, a monitoring unit, and a sound wave generating unit.

[0055] The seawater filtration unit includes a seawater pump, a coarse filter, and a self-cleaning filter. The outlet of the seawater pump is connected to the inlet of the coarse filter, the outlet of the coarse filter is connected to the inlet of the self-cleaning filter, and the outlet of the self-cleaning filter is connected to an external seawater cooling system.

[0056] The sodium hypochlorite solution generating unit includes an electrolysis device, a sodium hypochlorite storage tank, and a dosing pump. The outlet of the self-cleaning filter is also connected to the inlet of the electrolysis device. The outlet of the electrolysis device is connected to the inlet of the sodium hypochlorite storage tank. The outlet of the sodium hypochlorite storage tank is connected to the inlet of a seawater pump via the dosing pump.

[0057] The monitoring unit includes a first pressure transmitter, a second pressure transmitter, a temperature transmitter, a residual chlorine transmitter, a flow transmitter, and a comprehensive control cabinet. The first pressure transmitter is installed on the pipeline between the seawater pump and the coarse filtration unit, and the second pressure transmitter is installed on the pipeline between the coarse filtration unit and the self-cleaning filter. The first pressure transmitter, second pressure transmitter, temperature transmitter, residual chlorine transmitter, and flow transmitter are electrically connected to their respective connection terminals in the comprehensive control cabinet.

[0058] The acoustic wave generating unit includes a rectifier cabinet and an acoustic wave transducer. The acoustic wave transducer is located on one side of the seawater pump, and the rectifier cabinet supplies power to the electrolysis device and the acoustic wave transducer.

[0059] The seawater pump, coarse filter, self-cleaning filter, dosing pump, and acoustic transducer are electrically connected to their respective connection terminals in the integrated control cabinet, and the rectifier cabinet is electrically connected to the integrated control cabinet.

[0060] The treatment method includes: pre-setting the upper limit value ΔP_set2 and the lower limit value ΔP_set1 of the inlet and outlet pressure difference of the coarse filter device in the integrated control cabinet; monitoring the inlet and outlet pressures of the coarse filter device by the first and second pressure transmitters; and obtaining the actual inlet and outlet pressure difference ΔP of the coarse filter device from the monitored inlet and outlet pressures by the integrated control cabinet.

[0061] If ΔP < ΔP_set1, the seawater pumped out by the seawater pump undergoes dual filtration through a coarse filter and a self-cleaning filter before being circulated into the seawater side of the seawater cooling system.

[0062] A portion of the seawater output from the self-cleaning filter is fed into an electrolysis device for electrolysis, generating a sodium hypochlorite solution that can sterilize seawater. This solution is then stored in a sodium hypochlorite storage tank, and a dosing pump delivers the sodium hypochlorite solution to the inlet of a seawater pump.

[0063] If ΔP_set1 ≤ ΔP < ΔP_set2, the system is in a high-load / high-risk state. The integrated control cabinet controls the coarse filter to start the backwashing or cleaning function and issues an alarm message.

[0064] If ΔP ≥ ΔP_set2, the system becomes clogged and is in a high-load / high-risk state. The integrated control cabinet controls the coarse filter to start the backwashing or cleaning function, and at the same time issues a "system load reduction" request and interlocks to reduce the operating frequency of the seawater pump. The acoustic transducer emits ultrasonic waves to suppress slime and works synergistically with the sodium hypochlorite solution to complete the enhanced treatment of marine organisms and decontamination of seawater.

[0065] The sodium hypochlorite solution generating unit and the sound wave generating unit described in this invention act at the front end of the seawater pump. Through the cooperation of different treatment units, the sterilization effect is enhanced, and the development of drug resistance in some organisms is avoided. At the same time, the cooperation of multiple biocidal devices and the use of different sterilization modes for different environmental conditions not only reduces energy consumption but also avoids the increased cleaning costs caused by rapid contamination of seawater pipelines due to malfunctions in a single treatment system.

[0066] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0067] Firstly, this invention treats marine organisms using a combination of physical and chemical methods, effectively avoiding the development of drug resistance and ineffectiveness in marine organisms caused by a single agent. It significantly improves the control efficiency for various marine organisms (shellfish, algae, tube worms, etc.) and effectively ensures the system's flow capacity and heat exchange efficiency.

[0068] Secondly, priority should be given to using electrolysis and physical methods to minimize the use of chemical agents and reduce ecological impact.

[0069] Third, intelligent monitoring and early warning can promptly detect potential problems; multiple technologies serve as backups for each other (such as using ultrasound and reagents in case of electrolysis failure) to improve the overall reliability of the system. Attached Figure Description

[0070] Figure 1 This is a schematic diagram of a specific embodiment of the marine biofouling prevention and control system of the offshore converter station water treatment system of the present invention;

[0071] Figure 2 This is a schematic diagram of the structure of the seawater pump protective sleeve of the present invention;

[0072] Figure 3 This is a schematic flowchart of the method for preventing marine biofouling in the water treatment system of the offshore converter station of the present invention.

[0073] In the diagram, 1. Seawater pump, 2. Coarse filter, 3. Self-cleaning filter, 4. Electrolytic cell, 5. Sodium hypochlorite storage tank, 6. Dosing pump, 7. Rectifier cabinet, 8. Integrated control cabinet, 9. Acoustic transducer, 101. First pressure transmitter, 102. Second pressure transmitter, 11. Seawater pipeline to the user side, 12. Seawater pipeline to the sodium hypochlorite generator, 13. Sodium hypochlorite dosing pipeline, 14. Electrical wiring harness, 15. Seawater pump protective sleeve, 151. Sleeve housing, 152. Acoustic transducer mounting plate, 153. Chemical dosing distribution plate, 154. Filter grid / screen. Detailed Implementation

[0074] The present invention will be further described below with reference to the accompanying drawings and the given embodiments, but is not limited thereto.

[0075] Example 1

[0076] like Figure 1 , 2 As shown, a marine biofouling prevention system for a marine converter station water treatment system is characterized by comprising a seawater filtration unit, a sodium hypochlorite solution generation unit, a monitoring unit, and a sound wave generation unit.

[0077] The seawater filtration unit includes a seawater pump 1, a coarse filter 2, and a self-cleaning filter 3. The outlet of the seawater pump 1 is connected to the inlet of the coarse filter 2, the outlet of the coarse filter 2 is connected to the inlet of the self-cleaning filter 3, and the outlet of the self-cleaning filter 3 is connected to an external seawater cooling system.

[0078] The sodium hypochlorite solution generating unit includes an electrolysis device 4, a sodium hypochlorite storage tank 5, and a dosing pump 6. The outlet of the self-cleaning filter 3 is also connected to the inlet of the electrolysis device 4. The outlet of the electrolysis device 4 is connected to the inlet of the sodium hypochlorite storage tank 5. The outlet of the sodium hypochlorite storage tank 5 is connected to the inlet of the seawater pump 1 via the dosing pump 6.

[0079] The monitoring unit includes a first pressure transmitter 101, a second pressure transmitter 102, a temperature transmitter 103, a residual chlorine transmitter 104, a flow transmitter 105, and a comprehensive control cabinet 8. The first pressure transmitter 101 is installed on the pipeline between the seawater pump 1 and the coarse filter 2, and the second pressure transmitter 102 is installed on the pipeline between the coarse filter 2 and the self-cleaning filter 3. The first pressure transmitter 101, the second pressure transmitter 102, the temperature transmitter 103, the residual chlorine transmitter 104, and the flow transmitter 105 are electrically connected to their respective connection terminals in the comprehensive control cabinet 8.

[0080] The acoustic wave generating unit includes a rectifier cabinet 7 and an acoustic wave transducer 9. The acoustic wave transducer 9 is located on one side of the seawater pump 1, and the rectifier cabinet 7 supplies power to the electrolysis device 4 and the acoustic wave transducer 9.

[0081] The seawater pump 1, coarse filter 2, self-cleaning filter 3, dosing pump 6 and acoustic transducer 9 are electrically connected to the corresponding connection terminals of the integrated control cabinet 8, and the rectifier cabinet 7 is electrically connected to the integrated control cabinet 8.

[0082] Furthermore, such as Figure 1 , 2 As shown, to prevent the seawater pump from being directly exposed to the seawater environment and to avoid corrosion from the seawater environment, the seawater pump 1 is installed below the sea level, and the outer periphery of the seawater pump 1 is equipped with a seawater pump protective sleeve 15 that isolates it from the seawater environment. The seawater pump protective sleeve 15 can effectively filter out some marine organisms that directly adhere to the seawater pump, thus extending the service life of the seawater pump.

[0083] Furthermore, such as Figure 2 As shown, to facilitate the installation of the seawater pump and the acoustic transducer, and to ensure that the sodium hypochlorite solution can be uniformly added to the inlet of the seawater pump, the seawater pump protective sleeve 15 includes a sleeve housing 151, an acoustic transducer mounting plate 152, a reagent dosing distribution plate 153, and a filter grid / screen 154.

[0084] The sleeve housing 151 is provided with an acoustic transducer mounting plate 152, and the seawater pump 1 is disposed inside the sleeve housing 151. The acoustic transducer 9 is mounted on the acoustic transducer mounting plate 152.

[0085] The sleeve housing 151 is also provided with a reagent dosing distribution plate 153, which is used to uniformly add the sodium hypochlorite solution delivered by the dosing pump 6 to the front inlet of the seawater pump 1.

[0086] The bottom of the sleeve housing 151 is provided with a filter grid / screen 154 for intercepting pollutants and marine organisms, and the agent dosing distribution plate 153 is located between the acoustic transducer mounting plate 152 and the filter grid / screen 154.

[0087] Furthermore, such as Figure 1 As shown, to facilitate connection between the self-cleaning filter and the seawater side of the seawater cooling system, the outlet of the self-cleaning filter 3 is connected to the seawater cooling system via a seawater pipeline 11 to the user side, allowing the double-filtered seawater to circulate in the seawater side of the seawater cooling system. Specifically, most of the seawater from the outlet of the self-cleaning filter 3 enters the seawater side of the seawater cooling system.

[0088] Furthermore, such as Figure 1 As shown, in order to facilitate the feeding of a small portion of the filtered seawater into the electrolysis device to generate sodium hypochlorite solution after electrolysis, the outlet of the self-cleaning filter 3 is connected to the inlet of the electrolysis device 4 through the seawater pipeline 12 of the sodium hypochlorite generator.

[0089] Furthermore, such as Figure 1 As shown, in order to facilitate the delivery of sodium hypochlorite solution to the inlet of the seawater pump, the dosing pump 6 delivers sodium hypochlorite solution to the inlet of the seawater pump 1 through the sodium hypochlorite dosing pipeline 13.

[0090] Furthermore, such as Figure 1 As shown, in order to facilitate the connection of electrical energy and control signals to the acoustic transducer, the acoustic transducer 9 is also electrically connected to the corresponding connection terminal of the integrated control cabinet 8 through the electrical wiring harness 14.

[0091] Furthermore, to facilitate its own backwashing, the coarse filter device 2 is equipped with an automatic backwashing function, and the filtration accuracy of the coarse filter device 2 is not less than 1mm. The pressure difference value obtained from the pressure transmitter can be used as the condition for triggering the backwashing function of the coarse filter device.

[0092] Furthermore, the self-cleaning filter 3 has an automatic backwashing function, and the filtration accuracy of the self-cleaning filter 3 is not less than 500 microns. The backwashing function of the self-cleaning filter 3 can be started by the integrated control cabinet at regular intervals or according to the pressure difference.

[0093] Furthermore, such as Figure 1 As shown, to prevent system operation from being affected by electrolysis device malfunctions, electrolysis device 4 consists of two electrolysis devices connected in parallel, with one device serving as a backup. The chlorine production of a single electrolysis device is sufficient to meet the dosage requirement of 4 ppm sodium hypochlorite.

[0094] Furthermore, such as Figure 1 As shown, in order to prevent the dosing pump from malfunctioning and affecting the normal operation of the system, the dosing pump 6 is composed of two metering pumps connected in parallel, and the two metering pumps form a one-standby-one-use structure.

[0095] Furthermore, in order to enable the present invention to achieve enhanced sterilization and decontamination through the combined action of ultrasound and sodium hypochlorite solution, the acoustic transducer 9 converts direct current into low-frequency ultrasound with a frequency range of 20-50kHz.

[0096] Furthermore, the sodium hypochlorite storage tank 5 described in this invention is made of corrosion-resistant plastic material, and the sodium hypochlorite solution storage capacity can meet the usage requirements for one day.

[0097] Example 2

[0098] like Figure 1 , 2 As shown in Figure 3, a method for preventing marine biofouling in a marine converter station water treatment system includes the marine biofouling prevention system of Example 1. The specific treatment steps are as follows:

[0099] The upper limit value ΔP_set2 and the lower limit value ΔP_set1 of the pressure difference between the inlet and outlet of the coarse filter device 2 are preset by the integrated control cabinet 8.

[0100] The inlet and outlet pressures of the coarse filter device 2 are monitored by the first pressure transmitter 101 and the second pressure transmitter 102. The integrated control cabinet 8 obtains the actual inlet and outlet pressure difference ΔP of the coarse filter device 2 based on the monitored inlet and outlet pressures.

[0101] If ΔP < ΔP_set1, the seawater pumped by the seawater pump 1 undergoes dual filtration through the coarse filter 2 and the self-cleaning filter 3 before being circulated into the seawater side of the seawater cooling system.

[0102] A portion of the seawater output from the self-cleaning filter 3 is fed into the electrolysis device 4 for electrolysis, generating a sodium hypochlorite solution that can sterilize seawater. This solution is then stored in the sodium hypochlorite storage tank 5, and the sodium hypochlorite solution is pumped to the inlet of the seawater pump 1 using the dosing pump 6.

[0103] If ΔP_set1 ≤ ΔP < ΔP_set2, the system is in a high-load / high-risk state. The integrated control cabinet 8 controls the coarse filter 2 to start the backwashing or cleaning function and issues an alarm message.

[0104] If ΔP ≥ ΔP_set2, the system becomes clogged and is in a high-load / high-risk state. The integrated control cabinet 8 controls the coarse filter 2 to start the backwashing or cleaning function, simultaneously issuing a "system load reduction" request and interlocking to reduce the operating frequency of the seawater pump 1. The acoustic transducer 9 emits ultrasonic waves to suppress slime and works synergistically with the sodium hypochlorite solution to achieve enhanced treatment of marine organisms and decontamination of seawater.

[0105] When the system is under high load / high risk, the integrated control cabinet 8 controls the acoustic transducer 9 to operate at rated power, adjusts the current of the electrolysis device 4 and controls the flow rate of the dosing pump 6, and the sodium hypochlorite solution generating unit operates at maximum output. At this time, the target residual chlorine concentration C of the sodium hypochlorite solution is... TRC The concentration is 0.5-0.7 mg / L.

[0106] Furthermore, such as Figure 3 As shown, in order to finely adjust the system's operating status, when ΔP < ΔP_set1, the integrated control cabinet 8 monitors the seawater temperature T and the target residual chlorine concentration C of the sodium hypochlorite solution in real time through temperature transmitter 103, residual chlorine transmitter 104, and flow transmitter 105. TRC and the actual seawater flow rate Q output by seawater pump 1 cw ,

[0107] If Q cw With a seawater temperature T < 10℃ and the system operating at a high load / high risk, the integrated control cabinet 8 controls the acoustic transducer 9 to operate at its rated power, adjusts the current of the electrolysis device 4, and controls the flow rate of the dosing pump 6. The sodium hypochlorite solution generating unit operates at maximum output. At this time, the target residual chlorine concentration C of the sodium hypochlorite solution is... TRC The concentration is 0.5-0.7 mg / L, wherein the rated seawater flow rate of the seawater pump 1 is Q_design.

[0108] If 30%·Q_design<Q cw <80%·Q_design, and seawater temperature 10℃<T<25℃, the system is in medium load / standard state. The integrated control cabinet 8 controls the acoustic transducer 9 to operate at rated power, adjusts the current of the electrolysis device 4 and controls the flow rate of the dosing pump 6. The sodium hypochlorite solution exhibits PID control, and the target residual chlorine concentration C TRC The concentration is 0.3-0.5 mg / L.

[0109] If Q cw With a concentration >80% Q_design and a seawater temperature T >25℃, the system is in a low-load / low-risk state. The integrated control cabinet 8 controls the acoustic transducer 9 to reduce its frequency and operate in energy-saving mode, adjusts the current of the electrolysis device 4 and controls the flow rate of the dosing pump 6 to maintain the sodium hypochlorite solution at the lowest possible dose or continuous dosing, and the target residual chlorine concentration C TRC It is 0.2 mg / L.

[0110] Furthermore, the first pressure transmitter 101 and the second pressure transmitter 102 monitor the inlet and outlet pressures of the coarse filter device 2, respectively, as P in and P out The formula for calculating the actual inlet and outlet pressure difference ΔP of the coarse filter device 2 is as follows:

[0111] ΔP=P in -P out

[0112] The unit of ΔP is kPa or bar.

[0113] Furthermore, the calculation of the sodium hypochlorite solution dosage, i.e., the output flow rate of the dosing pump 6:

[0114]

[0115] Among them, Q NaClO Required sodium hypochlorite solution dosage, in L / h.

[0116] Q cw The actual seawater flow rate of the seawater pump, in meters per second (m³). 3 / h,

[0117] C TRC Target residual chlorine concentration, in g / m³ 3 That is, mg / L.

[0118] ε: Current efficiency of the electrolysis device.

[0119] ρ: Density of sodium hypochlorite solution

[0120] % active : Effective concentration of sodium hypochlorite solution.

[0121] Furthermore, the current efficiency ε of the electrolysis device is 0.7-0.85, the density ρ of the sodium hypochlorite solution is approximately 1.02 kg / L, and the effective concentration % of the sodium hypochlorite solution is... active It is 6-10 g / L.

[0122] Furthermore, the formula for calculating the DC current of the electrolysis device 4 is as follows:

[0123] I_set=(Q NaClO % active ) / (k·ε)

[0124] Where k is the yield of the electrolysis unit, and the unit is kg / (kA·h), which means the number of kilograms of available chlorine that can be produced per kA current for one hour of operation.

[0125] Furthermore, in order to adapt to the output requirements of sodium hypochlorite solution under different operating conditions, the dosing pump 6 has dosing modes including shock dosing and continuous dosing. The time interval of shock dosing and the duration of continuous dosing are set by the integrated control cabinet 8. When the system is in a low load / low risk state, the dosing pump 6 operates in the continuous dosing mode. When the system is in a high load / high risk state, the dosing pump 6 operates in the shock dosing mode.

[0126] The sodium hypochlorite solution generating unit and the sound wave generating unit described in this invention act at the front end of the seawater pump. Through the cooperation of different treatment units, the sterilization effect is enhanced, and the development of drug resistance in some organisms is avoided. At the same time, the cooperation of multiple biocidal devices and the use of different sterilization modes for different environmental conditions not only reduces energy consumption but also avoids the increased cleaning costs caused by rapid contamination of seawater pipelines due to malfunctions in a single treatment system.

[0127] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0128] Firstly, this invention treats marine organisms using a combination of physical and chemical methods, effectively avoiding the development of drug resistance and ineffectiveness in marine organisms caused by a single agent. It significantly improves the control efficiency for various marine organisms (shellfish, algae, tube worms, etc.) and effectively ensures the system's flow capacity and heat exchange efficiency.

[0129] Secondly, priority should be given to using electrolysis and physical methods to minimize the use of chemical agents and reduce ecological impact.

[0130] Third, intelligent monitoring and early warning can promptly detect potential problems; multiple technologies serve as backups for each other (such as using ultrasound and reagents in case of electrolysis failure) to improve the overall reliability of the system.

[0131] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A system for preventing marine biofouling in a water treatment system of an offshore converter station, characterized in that: It includes a seawater filtration unit, a sodium hypochlorite solution generation unit, a monitoring unit, and a sound wave generation unit. The seawater filtration unit includes a seawater pump (1), a coarse filter (2), and a self-cleaning filter (3). The outlet of the seawater pump (1) is connected to the inlet of the coarse filter (2), the outlet of the coarse filter (2) is connected to the inlet of the self-cleaning filter (3), and the outlet of the self-cleaning filter (3) is connected to an external seawater cooling system. The sodium hypochlorite solution generating unit includes an electrolysis device (4), a sodium hypochlorite storage tank (5), and a dosing pump (6). The outlet of the self-cleaning filter (3) is also connected to the inlet of the electrolysis device (4). The outlet of the electrolysis device (4) is connected to the inlet of the sodium hypochlorite storage tank (5). The outlet of the sodium hypochlorite storage tank (5) is connected to the inlet of the seawater pump (1) through the dosing pump (6). The monitoring unit includes a first pressure transmitter (101), a second pressure transmitter (102), a temperature transmitter (103), a residual chlorine transmitter (104), a flow transmitter (105), and a comprehensive control cabinet (8). The first pressure transmitter (101), temperature transmitter (103), residual chlorine transmitter (104), and flow transmitter (105) are installed on the pipeline between the seawater pump (1) and the coarse filter (2), and the second pressure transmitter (102) is installed on the pipeline between the coarse filter (2) and the self-cleaning filter (3). The first pressure transmitter (101), the second pressure transmitter (102), the temperature transmitter (103), the residual chlorine transmitter (104), and the flow transmitter (105) are electrically connected to the corresponding connection terminals of the comprehensive control cabinet (8). The acoustic wave generating unit includes a rectifier cabinet (7) and an acoustic wave transducer (9). The acoustic wave transducer (9) is located on one side of the seawater pump (1), and the rectifier cabinet (7) supplies power to the electrolysis device (4) and the acoustic wave transducer (9). The seawater pump (1), coarse filter (2), self-cleaning filter (3), dosing pump (6) and acoustic transducer (9) are electrically connected to the corresponding connection terminals of the integrated control cabinet (8), and the rectifier cabinet (7) is electrically connected to the integrated control cabinet (8).

2. The marine biofouling prevention system for the water treatment system of the offshore converter station according to claim 1, characterized in that: The seawater pump (1) is located below the sea level, and the outer periphery of the seawater pump (1) is provided with a seawater pump protective sleeve (15) that is isolated from the seawater environment.

3. The marine biofouling prevention system for the water treatment system of the offshore converter station according to claim 2, characterized in that: The seawater pump protective sleeve (15) includes a sleeve housing (151), an acoustic transducer mounting plate (152), a reagent dosing distribution plate (153), and a filter grid / screen (154). The sleeve housing (151) is provided with an acoustic transducer mounting plate (152), and the seawater pump (1) is located inside the sleeve housing (151). The acoustic transducer (9) is mounted on the acoustic transducer mounting plate (152). The sleeve housing (151) is also provided with a chemical dosing distribution plate (153), which is used to uniformly add the sodium hypochlorite solution transported by the dosing pump (6) to the front inlet of the seawater pump (1). The bottom of the sleeve housing (151) is provided with a filter grid / screen (154) for intercepting pollutants and marine organisms, and the agent dosing distribution plate (153) is located between the acoustic transducer mounting plate (152) and the filter grid / screen (154).

4. The marine biofouling prevention system for the water treatment system of the offshore converter station according to claim 1, characterized in that: The outlet of the self-cleaning filter (3) is connected to the seawater cooling system via a seawater pipeline (11) to the user side, so that the seawater after double filtration enters the seawater side of the seawater cooling system for circulation.

5. The marine biofouling prevention system for the water treatment system of an offshore converter station according to claim 1, characterized in that: The outlet of the self-cleaning filter (3) is connected to the inlet of the electrolysis device (4) through the seawater pipeline (12) of the sodium hypochlorite generator.

6. The marine biofouling prevention system for the water treatment system of an offshore converter station according to claim 1, characterized in that: The dosing pump (6) delivers sodium hypochlorite solution to the inlet of the seawater pump (1) through the sodium hypochlorite dosing pipeline (13).

7. The marine biofouling prevention system for the water treatment system of an offshore converter station according to claim 1, characterized in that: The acoustic transducer (9) is also electrically connected to the corresponding connection terminal of the integrated control cabinet (8) via an electrical wiring harness (14).

8. The marine biofouling prevention system for the water treatment system of an offshore converter station according to claim 1, characterized in that: The coarse filter device (2) has an automatic backwashing function, and the filtration accuracy of the coarse filter device (2) is not less than 1 mm.

9. The marine biofouling prevention system for the water treatment system of an offshore converter station according to claim 1, characterized in that: The self-cleaning filter (3) has an automatic backwashing function, and the filtration accuracy of the self-cleaning filter (3) is not less than 500 micrometers.

10. The marine biofouling prevention system for the water treatment system of an offshore converter station according to claim 1, characterized in that: The electrolysis device (4) is composed of two electrolysis devices connected in parallel, and the two electrolysis devices form a standby and one-for-use structure.

11. The marine biofouling prevention system for the water treatment system of an offshore converter station according to claim 1, characterized in that: The dosing pump (6) consists of two metering pumps connected in parallel, and the two metering pumps form a standby and one-for-use structure.

12. The marine biofouling prevention system for the water treatment system of an offshore converter station according to claim 1, characterized in that: The acoustic transducer (9) converts direct current into low-frequency ultrasonic waves with a frequency range of 20-50kHz.

13. A method for preventing marine biofouling in a marine converter station water treatment system, comprising the marine biofouling prevention system for a marine converter station water treatment system as described in any one of claims 1-12, characterized in that: The specific remediation steps are as follows: The upper limit ΔP_set2 and lower limit ΔP_set1 of the inlet and outlet pressure difference of the coarse filter device (2) are preset by the integrated control cabinet (8). The inlet and outlet pressures of the coarse filter device (2) are monitored by the first pressure transmitter (101) and the second pressure transmitter (102). The integrated control cabinet (8) obtains the actual inlet and outlet pressure difference ΔP of the coarse filter device (2) based on the monitored inlet and outlet pressures. If ΔP < ΔP_set1, the seawater pumped by the seawater pump (1) undergoes dual filtration through the coarse filter (2) and the self-cleaning filter (3) before being circulated into the seawater side of the seawater cooling system. Part of the seawater output from the self-cleaning filter (3) is sent to the electrolysis device (4) for electrolysis. The electrolysis generates a sodium hypochlorite solution that can sterilize seawater, which is then stored in a sodium hypochlorite storage tank (5). The sodium hypochlorite solution is then transported to the inlet of the seawater pump (1) using a dosing pump (6). If ΔP_set1≤ΔP<ΔP_set2, the system is in a high-load / high-risk state. The integrated control cabinet (8) controls the coarse filter device (2) to start the backwashing or cleaning function and issues an alarm message. If ΔP ≥ ΔP_set2, the system becomes clogged and is in a high-load / high-risk state. The integrated control cabinet (8) controls the coarse filter (2) to start the backwashing or cleaning function, and at the same time issues a "system load reduction" request, and interlocks to reduce the operating frequency of the seawater pump (1). The acoustic transducer (9) emits ultrasonic waves to suppress slime and works synergistically with the sodium hypochlorite solution to complete the enhanced treatment of marine organisms and seawater decontamination. When the system is under high load / high risk, the integrated control cabinet (8) controls the acoustic transducer (9) to operate at rated power, adjusts the current of the electrolysis device (4) and controls the flow rate of the dosing pump (6), and the sodium hypochlorite solution generating unit operates at maximum output. At this time, the target residual chlorine concentration C of the sodium hypochlorite solution is... TRC The concentration is 0.5-0.7 mg / L.

14. The method for preventing marine biofouling in the water treatment system of an offshore converter station according to claim 13, characterized in that: When ΔP < ΔP_set1, the integrated control cabinet (8) monitors the seawater temperature T and the target residual chlorine concentration C of the sodium hypochlorite solution in real time through the temperature transmitter (103), residual chlorine transmitter (104), and flow transmitter (105). TRC And the actual seawater flow rate Q output by the seawater pump (1) cw , If Q cw <30%·Q_design, and seawater temperature T<10℃, the system is in a high load / high risk state. The integrated control cabinet (8) controls the acoustic transducer (9) to operate at rated power, adjusts the current of the electrolysis device (4) and controls the flow rate of the dosing pump (6), and the sodium hypochlorite solution generating unit operates at maximum output. At this time, the target residual chlorine concentration C of the sodium hypochlorite solution is... TRC The concentration is 0.5-0.7 mg / L, wherein the rated seawater flow rate of the seawater pump (1) is Q_design. If 30%·Q_design<Q cw <80%·Q_design, and seawater temperature 10℃<T<25℃, the system is in medium load / standard state, the integrated control cabinet (8) controls the acoustic transducer (9) to operate at rated power, adjusts the current of the electrolysis device (4) and controls the flow rate of the dosing pump (6), the sodium hypochlorite solution exhibits PID control, and the target residual chlorine concentration C TRC The concentration is 0.3-0.5 mg / L. If Q cw >80%·Q_design, and seawater temperature T>25℃, the system is in a low load / low risk state. The integrated control cabinet (8) controls the acoustic transducer (9) to reduce the frequency and operate in energy-saving mode, adjusts the current of the electrolysis device (4) and controls the flow rate of the dosing pump (6) to keep the sodium hypochlorite solution at the lowest dose or continuous dosing, and the target residual chlorine concentration C TRC It is 0.2 mg / L.

15. The method for preventing marine biofouling in the water treatment system of an offshore converter station according to claim 13, characterized in that: The first pressure transmitter (101) and the second pressure transmitter (102) monitor the inlet and outlet pressures of the coarse filter device (2) as P, respectively. in and P out The formula for calculating the actual inlet and outlet pressure difference ΔP of the coarse filter device (2) is as follows: ΔP=P in -P out The unit of ΔP is kPa or bar.

16. The method for preventing marine biofouling in the water treatment system of an offshore converter station according to claim 13, characterized in that: The calculation of the sodium hypochlorite solution dosage, i.e. the output flow rate of the dosing pump (6): Among them, Q NaClO Required sodium hypochlorite solution dosage, in L / h. Q cw The actual seawater flow rate of the seawater pump, in meters per second (m³). 3 / h, C TRC Target residual chlorine concentration, in g / m³ 3 That is, mg / L. ε: Current efficiency of the electrolysis device. ρ: Density of sodium hypochlorite solution % active : Effective concentration of sodium hypochlorite solution.

17. The method for preventing marine biofouling in the water treatment system of an offshore converter station according to claim 16, characterized in that: The current efficiency ε of the electrolysis device is 0.7-0.85, the density ρ of the sodium hypochlorite solution is approximately 1.02 kg / L, and the effective concentration % of the sodium hypochlorite solution is... active It is 6-10 g / L.

18. The method for preventing marine biofouling in the water treatment system of an offshore converter station according to claim 16, characterized in that: The formula for calculating the DC current of the electrolysis device (4) is as follows: I_set=(Q NaClO ·% active ) / (k·ε) Where k is the yield of the electrolysis unit, and the unit is kg / (kA·h), which means the number of kilograms of available chlorine that can be produced per kA current for one hour of operation.

19. The method for preventing marine biofouling in the water treatment system of an offshore converter station according to claim 13, characterized in that: The dosing modes of the dosing pump (6) include shock dosing and continuous dosing. The time interval of shock dosing and the time of continuous dosing are set by the integrated control cabinet (8). When the system is in a low load / low risk state, the dosing pump (6) operates in the continuous dosing mode. When the system is in a high load / high risk state, the dosing pump (6) operates in the shock dosing mode.

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