Submarine cable-based integrated water delivery pipeline, fresh water supply system and supply method

Abstract

The invention discloses an integrated water conveying pipeline based on submarine cables, a fresh water supply system and a supply method, and belongs to the technical field of marine new energy operation and maintenance guarantee. The integrated water conveying pipeline is of a coaxial structure and sequentially comprises a submarine cable, an insulating rubber layer, a water conveying pipeline body and an armor layer from inside to outside. The fresh water supply system comprises the integrated water conveying pipeline, an onshore fresh water pressurization system, an offshore fresh water receiving and storing system and a monitoring and control system. The supply method comprises the steps that land fresh water enters the integrated water conveying pipeline after being filtered and pressurized, is conveyed to the sea in a cross-sea mode, is subjected to decompression and sterilization treatment and is stored in the water storage tank, and the monitoring system monitors relevant parameters in real time. According to the method, the cost is reduced by using the existing laying path of the submarine cable, the supply stability is improved through continuous conveying and real-time monitoring, the fresh water management is optimized through the prediction model, the long-period operation and maintenance requirements of the offshore booster station are met, and the method can be widely applied to the offshore booster station fresh water supply scene of near and open seas.

Description

Technical Field

[0001] This invention relates to the field of marine new energy operation and maintenance support technology, and in particular to an integrated water pipeline, freshwater supply system and supply method based on submarine cables. Background Technology

[0002] Currently, the mainstream technologies for freshwater supply to offshore substations mainly include freshwater transportation and on-site desalination. Freshwater transportation involves regularly delivering bottled or canned freshwater to the substation by transport ships; the transportation cycle is affected by weather and is generally 7-15 days per trip. On-site desalination involves installing small-scale seawater desalination equipment at the substation, using reverse osmosis technology to convert seawater into freshwater; the equipment power is typically 5-10 kW. For storage, stainless steel storage tanks are commonly used, with storage capacity set according to the number of personnel, generally 50-100 m³.

[0003] Existing technologies have many shortcomings: high transportation costs, with a single transport cost exceeding 10,000 yuan for a distance of 30 kilometers offshore, and annual transportation costs reaching 500,000 to 800,000 yuan; poor supply stability, as transport ships cannot navigate in severe weather, easily leading to freshwater shortages and affecting operation and maintenance; and the on-site desalination equipment is affected by seawater turbidity and temperature, resulting in unstable water output efficiency. When seawater turbidity is high, the water production rate of the desalination equipment drops by more than 30%, and equipment failure will directly interrupt the freshwater supply; and high water storage risks, as the capacity of water storage tanks is limited, and if the supply is interrupted for more than 7 days, the freshwater may be exhausted. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an integrated water pipeline, freshwater supply system, and supply method based on submarine cables, in order to solve the problems of high cost, poor stability, and high risk of water storage in existing offshore booster stations.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An integrated water pipeline based on a submarine cable has a coaxial structure and includes, from the inside out, a submarine cable, an insulating rubber layer, a water pipeline, and an armor layer. The water pipeline is used to transport fresh water, the insulating rubber layer is used to isolate the current of the submarine cable from interfering with the water transport, and the armor layer is used to resist seawater corrosion and friction with seabed rocks.

[0006] Furthermore, the water supply pipe is a food-grade PE pipe with an inner diameter of 50-80mm, and its seawater corrosion resistance meets the GB / T10125-2021 standard.

[0007] Furthermore, the thickness of the insulating rubber layer is 5mm, and the armor layer is a double-layer steel strip armor layer with a thickness of 10mm.

[0008] A submarine cable-based freshwater supply system includes an integrated water pipeline, a land-based freshwater pressurization system, a marine freshwater receiving and storage system, and a monitoring and control system. The land-based freshwater pressurization system is connected to one end of the integrated water pipeline to pressurize land-based freshwater and send it into the integrated water pipeline. The marine freshwater receiving and storage system is connected to the other end of the integrated water pipeline to receive and store the freshwater transported by the integrated water pipeline. The monitoring and control system is connected to the land-based freshwater pressurization system, the marine freshwater receiving and storage system, and the integrated water pipeline to monitor and regulate relevant parameters during the freshwater supply process.

[0009] Furthermore, the onshore freshwater pressurization system includes a variable frequency booster pump, a filter, and a pressure sensor. The filter is used to filter impurities from the onshore freshwater, the variable frequency booster pump is used to pressurize the filtered freshwater, and the pressure sensor is used to monitor the pressure of the pressurized freshwater.

[0010] Furthermore, the marine freshwater receiving and storage system includes a pressure reducing valve, an ultraviolet sterilizer, and a marine water storage tank. The pressure reducing valve is used to reduce the pressure of the freshwater transported to the sea via the integrated water pipeline. The ultraviolet sterilizer is used to sterilize the freshwater after pressure reduction. The marine water storage tank is used to store the sterilized freshwater.

[0011] Furthermore, the monitoring and control system includes a PLC controller, a liquid level sensor, a flow sensor, a water quality analyzer, and a remote communication module; the liquid level sensor is installed inside the offshore water storage tank to monitor the water level inside the tank; the flow sensor and the water quality analyzer are installed on the integrated water transmission pipeline to monitor the flow rate and water quality of fresh water in the pipeline, respectively; the PLC controller is connected to the variable frequency booster pump, pressure sensor, pressure reducing valve, ultraviolet sterilizer, liquid level sensor, flow sensor, water quality analyzer, and remote communication module, and the remote communication module is connected to a remote monitoring platform.

[0012] A method for supplying freshwater based on a submarine cable, employing the aforementioned submarine cable-based freshwater supply system, includes the following steps: S1: Onshore freshwater is filtered by the filter of the onshore freshwater pressurization system, pressurized by a variable frequency booster pump, and enters the integrated water transmission pipeline; S2: The freshwater is transported across the sea to the offshore booster station via the integrated water transmission pipeline, depressurized by the pressure reducing valve of the offshore freshwater receiving and storage system, and then treated by an ultraviolet sterilizer; S3: The sterilized freshwater is stored in an offshore water storage tank, and the liquid level sensor of the monitoring and control system monitors the water level in real time. When the water level is lower than a set threshold, a water replenishment signal is sent to the PLC controller; S4: After receiving the signal, the PLC controller adjusts the output parameters of the variable frequency booster pump to ensure stable water supply. If an abnormality is detected, an alarm is triggered and pushed to the remote monitoring platform via a remote communication module.

[0013] Further, in step S1, the variable frequency booster pump pressurizes the fresh water to 1.2-1.5 MPa; in step S2, the pressure reducing valve reduces the fresh water pressure to 0.4 MPa.

[0014] Furthermore, it also includes freshwater storage prediction and scheduling steps: through the freshwater storage prediction model, the average daily water consumption of the booster station, future meteorological data and personnel change plans are input, and a freshwater delivery volume suggestion is output. The PLC controller adjusts the operating parameters of the variable frequency booster pump according to the suggestion, controls the water delivery volume, and maintains the liquid level in the offshore water storage tank at 50%-80% of its capacity.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By utilizing the existing submarine cable laying path of the offshore booster station, the water pipeline and the submarine cable are laid in the same trench, eliminating the need for separate excavation of the seabed trench. The construction cost of the composite pipeline is reduced by more than 40% compared to the traditional independent pipeline. At the same time, it completely eliminates the costs related to transportation, loading and unloading, and storage by transport ships, directly reducing annual operating costs by 500,000 to 800,000 yuan. This dual reduction in freshwater supply costs from both the construction and operation ends solves the pain point of "high cost and low efficiency" in the traditional supply model.

[0016] 2. The system utilizes a submarine cable-water transmission composite pipeline for continuous 24-hour delivery, unaffected by marine weather conditions, completely eliminating the risk of transport ship delays. Through dual purification via onshore pretreatment and marine ultraviolet sterilization, and with the water transmission process unaffected by seawater environmental parameters, the water quality consistently meets domestic and industrial water standards. Furthermore, the monitoring system and pressurization system work in tandem to adjust water transmission parameters in real time, solving the core problems of "weather dependence, water quality fluctuations, and supply interruptions due to equipment failure," thus improving the freshwater security rate.

[0017] 3. By using small water storage tanks of 3-5m³, the footprint of the offshore platform is significantly reduced. In addition, by combining the ARIMA time series prediction model and inputting personnel water consumption, equipment water consumption and meteorological data, the water supply can be accurately planned to maintain the water tank level at 50%-80%, thus avoiding the contradiction of "excessive water storage occupying space and insufficient water storage facing shortages".

[0018] 4. Freshwater is continuously circulated 24 hours a day, and ultraviolet sterilization treatment is used to prevent water quality deterioration caused by long-term stagnation. At the same time, the remote monitoring system monitors the water level in the storage tank in real time and automatically triggers water replenishment when the level is lower than 1 / 3 of the volume, completely solving the dual risks of "water depletion and water quality deterioration".

[0019] 5. The composite pipe of the present invention adopts a double-layer steel strip armor layer + food-grade PE pipe material, and its seawater corrosion resistance level meets the GB / T10125-2021 standard. Its corrosion resistance life can reach 20 years, which is completely matched with the service life of submarine cable, and there is no need for frequent replacement.

[0020] 6. Through the design of "integrated structure, precise control, and intelligent operation and maintenance", this invention comprehensively solves many defects of existing technologies in terms of cost, stability, safety, and adaptability. It provides a "low-cost, high-reliability, long-life, and easy-to-operate and maintain" freshwater supply solution for near-shore and offshore substations. It can also be extended to other marine facilities such as offshore wind farms and offshore platforms, and its application value is significant. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the integrated water supply pipeline of the present invention; Figure 2 This is a diagram showing the overall architecture of the freshwater supply system of the present invention.

[0022] In the diagram: 1. Submarine cable; 2. Insulating rubber layer; 3. Water pipeline; 4. Armor layer; 5. Onshore freshwater booster system; 6. Variable frequency booster pump; 7. Filter; 8. Pressure sensor; 9. Integrated water pipeline; 10. Offshore freshwater receiving and storage system; 11. Pressure reducing valve; 22. Ultraviolet sterilizer; 33. Offshore water storage tank; 14. PLC controller; 15. Remote monitoring platform; 16. Municipal water supply network. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-2 The present invention provides a technical solution: an integrated water pipeline, freshwater supply system and supply method based on submarine cable, which will be described in detail below with reference to specific embodiments.

[0025] like Figure 1 As shown, the integrated water transmission pipeline has a coaxial structure, consisting of, from the inside out, a submarine cable 1, an insulating rubber layer 2, a water transmission pipeline 3, and an armor layer 4. The water transmission pipeline 3 is made of food-grade PE pipe with an inner diameter of 60mm. Its seawater corrosion resistance meets the GB / T10125-2021 standard, ensuring that the transported freshwater is not contaminated and is not easily corroded by seawater during long-term use. The insulating rubber layer 2 is 5mm thick, effectively isolating the current from the submarine cable 1 from interfering with the freshwater in the pipeline 3, thus preventing any impact on water quality. The armor layer 4 uses a double-layer steel strip armor layer with a thickness of 10mm. This structure effectively resists seawater corrosion and friction from seabed rocks, extending the service life of the integrated water transmission pipeline.

[0026] During the construction of the submarine cable for the offshore booster station, a conventional submarine cable laying vessel is used to lay the integrated water pipeline simultaneously along the coastal cable route. The two ends are connected to the onshore booster station and the offshore booster station, respectively. The laying depth is 1.5m below the seabed mud surface, which can effectively avoid anchor damage to the pipeline.

[0027] Water pipeline end seal Inner layer food-grade PE water pipe sealing: Utilizing a composite structure of "double sealing rings + end face sealing". The end of the food-grade PE water pipe is flared, with two pre-drilled sealing grooves on the inner wall of the flare. Food-grade silicone sealing rings (Shore hardness 70±5°, water pressure resistance ≥2.0MPa, meeting safety standards for food contact materials) are embedded in these grooves. After mechanical cutting and smoothing the pipe end face, a PTFE sealing gasket is applied, achieving end face sealing through the sealing rings. This double-blocking of freshwater leakage paths ensures no dripping under a delivery pressure of 1.2-1.5MPa.

[0028] The integrated structure of the connector between the integrated water supply pipeline 6 and the external water pipe adopts a "socket-type + mechanical locking" connector, consisting of a two-layer structure: an inner core and an armored connection section, which is compatible with the composite pipeline layers shown in Appendix 1. Inner core: Made of 316L stainless steel (seawater corrosion resistance grade conforms to GB / T 10125-2021), it adopts a socket insertion into the end of the pipe. The inner core is equipped with a double-layer clamping pipe structure and is fastened to the water outlet at the end of the water supply pipe to avoid increasing water flow resistance or scratching the inner wall of the pipe.

[0029] Armored connection section: Corresponding to the double-layer steel strip armor layer in Figure 1, an armored clamping sleeve is provided on the outside of the connector. The inner wall of the clamping sleeve is in contact with the double-layer steel strip armor layer and is radially pressed by 4 sets of stainless steel locking bolts. At the same time, the end of the armor layer is welded and fixed to the clamping sleeve (using argon arc welding, weld width ≥8mm) to prevent seawater from seeping into the pipe from the gaps in the armor layer.

[0030] like Figure 2 As shown, the freshwater supply system includes the aforementioned integrated water transmission pipeline 6, the onshore freshwater pressurization system 5, the offshore freshwater receiving and storage system 7, and the monitoring and control system.

[0031] The onshore freshwater booster system 5 is located at the onshore control station of the wind farm and connected to the municipal water supply network 10. It includes a variable frequency booster pump 51, a filter 52, and a pressure sensor 53. The filter 52 uses a 1μm filter element, effectively filtering impurities from the onshore freshwater to ensure water quality. The variable frequency booster pump 51 has a flow rate of 1.5 m³ / h and is used to pressurize the filtered freshwater. The pressure sensor 53 monitors the pressure of the pressurized freshwater in real time.

[0032] The offshore freshwater receiving and storage system 7 is installed on the offshore booster station platform and includes a pressure reducing valve 71, an ultraviolet sterilizer 72, and an offshore water storage tank 73. The pressure reducing valve 71 reduces the pressure of the freshwater delivered to the sea via the integrated water pipeline 6 to 0.4 MPa to meet subsequent usage requirements. The ultraviolet sterilizer 72 is a 30W model, which can effectively kill bacteria and other microorganisms in the freshwater, ensuring the safety of drinking water. The offshore water storage tank 73 has a volume of 3 m³ and is used to store the sterilized freshwater.

[0033] The monitoring and control system includes a PLC controller 8, a level sensor, a flow sensor, a water quality analyzer, and a remote communication module. The level sensor is installed inside the offshore water storage tank 73 to monitor the water level within the tank; its set replenishment threshold is 1 m³. The flow sensor and water quality analyzer are installed on the integrated water transmission pipeline 6. The flow sensor monitors the flow rate of freshwater in the pipeline, and the water quality analyzer monitors the pH value (normal range 6.5-8.5) and impurity content (≤1 mg / L) of the freshwater. The PLC controller 8 is connected to the variable frequency booster pump 51, pressure sensor 53, pressure reducing valve 71, ultraviolet sterilizer 72, level sensor, flow sensor, water quality analyzer, and remote communication module. The remote communication module communicates with the remote monitoring platform 9 to achieve real-time data transmission and remote control.

[0034] During system commissioning and installation, the variable frequency booster pump 51 was started to stabilize the pipeline pressure at 1.4 MPa, and the tested water flow rate was 1.2 m³ / h. 3 / h, verify the pressure and liquid level data transmission function of the remote monitoring platform 9, and the alarm response time is ≤5s.

[0035] The freshwater supply method includes the following steps: S1: Onshore freshwater is filtered by filter 52 of the onshore freshwater booster system 5, then pressurized to 1.4 MPa by the variable frequency booster pump 51, and enters the integrated water transmission pipeline 6. Filter 52 removes impurities from the freshwater, preventing them from entering the pipeline and causing blockages or affecting subsequent use. S2: Freshwater is transported across the sea to the offshore booster station via the integrated water transmission pipeline 6. The pressure is reduced to 0.4 MPa by the pressure reducing valve 71 of the offshore freshwater receiving and storage system 7, and then treated by the ultraviolet sterilizer 72. The pressure of the depressurized freshwater is suitable for subsequent storage and use, while the ultraviolet sterilizer 72 further ensures the hygiene and safety of the freshwater. S3: The sterilized freshwater is stored in the offshore water storage tank 73. The level sensor monitors the water level in real time. When the water level is below 1 m³ (i.e., 1 / 3 of the volume), a water replenishment signal is sent to the PLC controller 8. S4: After receiving the signal, the PLC controller 8 adjusts the output parameters of the variable frequency booster pump 51 to ensure stable water supply. Meanwhile, the flow sensor, water quality analyzer, and pressure sensor 53 collect flow, water quality, and pressure data in the pipeline in real time. When the pressure is below 0.3MPa or above 0.5MPa, the flow rate is below 4.5m³ / h, the pH value exceeds the range of 6.5-8.5, or the impurity content exceeds the standard, the PLC controller 8 triggers an alarm and pushes it to the remote monitoring platform 9 through the remote communication module to notify maintenance personnel to handle it in a timely manner.

[0036] In addition, this freshwater supply method also includes freshwater storage prediction and scheduling steps: The freshwater storage prediction model uses the ARIMA time series analysis algorithm, inputting the average daily water consumption of the booster station over the past 3 months (150L / person / day for domestic use, 2000L / day for equipment cooling), meteorological data for the next 7 days (high temperatures will increase cooling water consumption by 10%-20%), and personnel change plans, and outputs a weekly freshwater delivery recommendation. For example, when the booster station has 10 maintenance personnel and there is no high temperature weather in the next 7 days, the model recommends delivering 35m³ of freshwater per week. 3 (10 people × 150L × 7 days + 2000L × 7 days = 35000L). Based on the prediction results, the PLC controller 8 adjusts the operating parameters of the variable frequency booster pump 51 to control the water delivery volume and maintain the liquid level in the marine water storage tank 73 at 50%-80% of its capacity to ensure a balance between freshwater supply and demand and avoid situations where excessive water storage occupies too much space or insufficient water storage occurs.

[0037] This invention reduces construction costs by laying the integrated water pipeline and submarine cable 1 in the same trench, utilizing existing routes; it ensures the stability and security of freshwater supply through a comprehensive monitoring and control system; and it achieves precise supply and demand matching and optimizes freshwater management through a freshwater storage prediction model. This solution can effectively reduce the freshwater supply cost of offshore booster stations, improve supply stability, and meet long-term operation and maintenance needs, showing broad application prospects.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A submarine cable based integrated water conveyance pipeline, characterized in that, The coaxial structure comprises, from inside to outside, a submarine cable, an insulating rubber layer, a water pipeline for transporting fresh water, and an armored layer for resisting seawater corrosion and friction with seabed rocks.

2. A submarine cable based integrated water pipeline according to claim 1, characterized in that, The water pipeline is a food-grade PE pipeline with an inner diameter of 50-80 mm.

3. A submarine cable based integrated water pipeline according to claim 1, characterized in that, The insulating rubber layer has a thickness of 5 mm, and the armored layer is a double-layer steel belt armored layer with a thickness of 10 mm.

4. A submarine cable based fresh water supply system characterized in that, The system further comprises a land-based fresh water pressurization system connected to one end of the integrated water pipeline for pressurizing land-based fresh water and sending the pressurized fresh water into the integrated water pipeline, a sea-based fresh water receiving and storage system connected to the other end of the integrated water pipeline for receiving and storing the fresh water transported by the integrated water pipeline, and a monitoring and control system connected to the land-based fresh water pressurization system, the sea-based fresh water receiving and storage system, and the integrated water pipeline for monitoring relevant parameters in the fresh water supply process and performing control.

5. A submarine cable based fresh water supply system according to claim 4, characterized in that, The land-based fresh water pressurization system comprises a variable frequency pressurization pump, a filter for filtering impurities in the land-based fresh water, and a pressure sensor for monitoring the pressure of the pressurized fresh water.

6. A submarine cable based fresh water supply system according to claim 4, characterized in that, The sea-based fresh water receiving and storage system comprises a pressure reduction valve for reducing the pressure of the fresh water transported by the integrated water pipeline, an ultraviolet sterilizer for sterilizing the fresh water after pressure reduction, and a sea-based water storage tank for storing the sterilized fresh water.

7. A submarine cable based fresh water supply system according to claim 4, characterized in that, The monitoring and control system comprises a PLC controller, a liquid level sensor arranged in the sea-based water storage tank for monitoring the water level in the sea-based water storage tank, a flow sensor and a water quality detector arranged on the integrated water pipeline for monitoring the flow and quality of the fresh water in the pipeline, and a remote communication module in communication connection with a remote monitoring platform.

8. A method of supplying fresh water based on a submarine cable, characterized by The system further comprises the following steps: S1: Land-based fresh water is filtered by the filter of the land-based fresh water pressurization system, pressurized by the variable frequency pressurization pump, and then enters the integrated water pipeline; S2: The fresh water is transported across the sea by the integrated water pipeline to a sea-based pressurization station, is reduced in pressure by the pressure reduction valve of the sea-based fresh water receiving and storage system, and is then treated by the ultraviolet sterilizer; S3: The sterilized fresh water is stored in the sea-based water storage tank, and the liquid level sensor of the monitoring and control system monitors the water level in real time and sends a water replenishment signal to the PLC controller when the water level is below a set threshold. S4: After receiving the signal, the PLC controller adjusts the output parameters of the variable frequency booster pump to ensure stable water delivery. If abnormal conditions are detected, an alarm is triggered and pushed to the remote monitoring platform through the remote communication module.

9. A sea cable based fresh water supply method according to claim 8, characterized in that, In step S1, the variable frequency booster pump pressurizes the fresh water to 1.2-1.5 MPa; in step S2, the pressure reducing valve reduces the fresh water pressure to 0.4 MPa.

10. The submarine cable-based fresh water supply method according to claim 8, characterized by, It also includes a fresh water reserve prediction and scheduling step: through a fresh water reserve prediction model, input the daily average water consumption of the booster station, future weather data and personnel change plan, output the fresh water delivery quantity suggestion, the PLC controller adjusts the operation parameters of the variable frequency booster pump according to the suggestion, controls the water delivery quantity, and maintains the liquid level in the offshore water storage tank at 50%-80% capacity.

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