Installation and recovery method of a submersible mud floating offshore wind turbine system

Abstract

The present application relates to offshore wind turbine technical field, especially to a kind of installation and recovery method of submersible mud floating offshore wind turbine system.The method comprises: S1, the installation stage of wet tow auxiliary unit: at least two wet tow auxiliary units are installed to the outer periphery of submersible mud floating offshore wind turbine;S2, the transport stage of wet tow auxiliary unit: towboat is fixed with two wet tow auxiliary units by tow cable, and the water displacement of each buoyancy cabin is controlled using air-water displacement valve in the transport process;S3, the removal stage of wet tow auxiliary unit: after reaching destination, the power source and control source of all wet tow auxiliary units are closed, and the fixation of submersible mud floating offshore wind turbine and wet tow auxiliary unit is released;S4, the installation stage of submersible mud floating offshore wind turbine;S5, the recovery stage of submersible mud floating offshore wind turbine;S6, repeat steps S1-S3.The above technical scheme can solve the problem that traditional wet tow method is limited in operation under severe sea conditions, and installation is simple, low in cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore wind turbines, and particularly relates to a method for installing and recycling a submerged mud floating offshore wind turbine system. BACKGROUND

[0002] With the increasingly prominent energy crisis, offshore wind power as a renewable energy has become an important part of the current energy structure and an important energy to solve the energy crisis. Wet towing is a common technology for towing submerged mud floating offshore wind turbines, which simplifies the offshore operation process and reduces costs and risks by towing the wind turbine structure with a tugboat. In related technologies, after the offshore wind turbine system is transported to the designated sea area, it needs to be installed with a large amount of manpower and material resources, and the installation process is complex.

[0003] Therefore, there is an urgent need to provide a method for installing and recycling a submerged mud floating offshore wind turbine system to solve the above technical problems. SUMMARY

[0004] The present application provides a method for installing and recycling a submerged mud floating offshore wind turbine system, which is simple and low in cost.

[0005] The present application provides a method for installing and recycling a submerged mud floating offshore wind turbine system, which includes:

[0006] Step S1, installation stage of wet towing auxiliary unit: at least two wet towing auxiliary units are installed to the outer periphery of the submerged mud floating offshore wind turbine; wherein, adjacent two wet towing auxiliary units are connected through an arc-shaped connecting piece, and the submerged mud floating offshore wind turbine and the wet towing auxiliary unit are connected through a linear connecting piece, each wet towing auxiliary unit includes a plurality of interconnected buoyancy cabins, and each buoyancy cabin is provided with a gas-water displacement valve;

[0007] Step S2, transportation stage of wet towing auxiliary unit: a tugboat is fixed with two wet towing auxiliary units through a tow rope, and the gas-water displacement valve is used to control the water filling and draining capacity of each buoyancy cabin during transportation to ensure the stability of the submerged mud floating offshore wind turbine during transportation;

[0008] Step S3, removal stage of wet towing auxiliary unit: after arriving at the destination, the power source and control source of all wet towing auxiliary units are closed, and the fixation of the submerged mud floating offshore wind turbine and the wet towing auxiliary unit is released, so that the wet towing auxiliary unit is removed from the submerged mud floating offshore wind turbine;

[0009] Step S4, installation stage of submerged mud floating offshore wind turbine:

[0010] Step S5, recycling stage of submerged mud floating offshore wind turbine:

[0011] Step S6: Repeat steps S1 to S3.

[0012] Beneficial effects:

[0013] The installation and recovery method for a submersible mud-floating offshore wind turbine system provided by embodiments of the present invention connects multiple wet towing auxiliary units to the periphery of the submersible mud-floating offshore wind turbine. By utilizing the air-water displacement valves in the buoyancy chambers, the filling and discharging volume of each buoyancy chamber can be precisely controlled. Thus, the overall buoyancy and distribution of the wet towing auxiliary units can be flexibly adjusted according to different foundation structures and transportation conditions, ensuring that the submersible mud-floating offshore wind turbine maintains a stable suspended state during transportation. Therefore, the above technical solution can solve the problem of operational limitations in harsh sea conditions inherent in traditional wet towing methods, and is simple to install and low in cost. Attached Figure Description

[0014] 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. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic flowchart illustrating the installation and recovery method of a submersible floating offshore wind turbine system according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of the wet mopping auxiliary unit according to an embodiment of the present invention;

[0017] Figure 3 for Figure 2 Rear view of the wet mopping auxiliary unit shown;

[0018] Figure 4 for Figure 2 The diagram shows an application scenario of the wet mopping auxiliary unit.

[0019] Figure 5 for Figure 4 A magnified view of a portion of the application scenario shown;

[0020] Figure 6 for Figure 2 The diagram shows two other application scenarios for the wet mopping auxiliary unit.

[0021] Figure 7 This is a schematic diagram of the structure of a submersible floating offshore wind turbine according to an embodiment of the present invention;

[0022] Figure 8 for Figure 7 The diagram shows the structural schematic of the foundation, anchoring components, and base of a submersible floating offshore wind turbine.

[0023] Figure 9 for Figure 8 the base, the anchoring assembly and the base shown in the front view;

[0024] Figure 10 for Figure 8 the structure of the anchor chain reeling device in the base shown in the schematic view;

[0025] Figure 11 for Figure 8 the structure of the anchor stock in the anchoring assembly shown in the schematic view;

[0026] Figure 12 for Figure 8 the structure of the base shown in the schematic view;

[0027] Figure 13 for Figure 12 the bottom view of the base shown in the schematic view.

[0028] Reference signs:

[0029] 100-wet tow auxiliary unit; 200-arc-shaped connecting piece; 300-linear connecting piece; 400-limiting ring; 500-tow rope;

[0030] 1-buoyancy chamber; 11-strip-shaped gap; 2-side wing; 21-folding joint piece; 3-first connecting structure; 4-second connecting structure; 5-steel structure frame body; 51-working bridge; 52-towing assembly; 53-anchor stock; 54-Z-direction limiting beam; 55-Y-direction limiting beam; 56-X-direction limiting beam;

[0031] 10-upper fan; 20-tower drum; 30-tower drum connecting piece; 40-base; 50-anchoring assembly; 60-base;

[0032] 401-first cylinder; 402-second cylinder; 403-hemispherical cylinder; 404-floating cylinder; 405-side rod; 406-bottom plate; 407-cross rod; 408-inclined support; 409-anchor chain reeling device; 501-anchor stock; 502-first water inlet and outlet hole; 503-lateral anchor chain; 601-baffle; 602-second water inlet and outlet hole; 603-dividing chamber; 604-vertical anchor chain. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] The submersion-mud-floating offshore wind turbine refers to a foundation capable of converting among full submersion suspension state, semi-submersion suspension state and mud floating state. The full submersion suspension state refers to that the foundation is suspended in seawater, in which the upper wind turbine has a high working height, which is beneficial to improve power generation efficiency and is suitable for a good marine environment. The semi-submersion suspension state refers to that the foundation is suspended on the sea surface, in which the upper wind turbine has the highest working height, which is more beneficial to improve power generation efficiency and is also suitable for a good marine environment. The mud floating state refers to that the foundation is fixed in the mud layer of the seabed, in which the upper wind turbine has a low working height, which is beneficial to improve safety and is suitable for a poor marine environment.

[0035] As shown in Figure 1 , Figure 2 and Figure 4 , the embodiment of the present application provides a kind of installation and recovery method of submersion-mud-floating offshore wind turbine system, comprising:

[0036] Step S1, the installation stage of wet tow auxiliary unit 100: at least two wet tow auxiliary units 100 are installed to the outer periphery of submersion-mud-floating offshore wind turbine;Wherein, adjacent two wet tow auxiliary units 100 are connected by arc-shaped connecting piece 200, and submersion-mud-floating offshore wind turbine and wet tow auxiliary unit 100 are connected by linear connecting piece 300, each wet tow auxiliary unit 100 includes multiple mutually connected buoyancy cabins 1, and each buoyancy cabin 1 is provided with air-water displacement valve (not shown in the figure);

[0037] Step S2, the transportation stage of wet tow auxiliary unit 100: the tugboat is fixed with two wet tow auxiliary units 100 by tow cable 500, and the water-filling capacity of each buoyancy cabin 1 is controlled by using air-water displacement valve in the transportation process, to ensure the stability of submersion-mud-floating offshore wind turbine in the transportation process;

[0038] Step S3, the removal stage of wet tow auxiliary unit 100: after reaching the destination, the power source and control source of all wet tow auxiliary units 100 are closed, and the fixing of submersion-mud-floating offshore wind turbine and wet tow auxiliary unit 100 is released, so that the wet tow auxiliary unit 100 is removed from the submersion-mud-floating offshore wind turbine;

[0039] Step S4, the installation stage of submersion-mud-floating offshore wind turbine:

[0040] Step S5, the recovery stage of submersion-mud-floating offshore wind turbine:

[0041] Step S6, repeat steps S1-S3.

[0042] In the embodiment, by connecting multiple wet towing auxiliary units 100 at the periphery of the submerged mud floating offshore wind turbine, and using the air-water displacement valve of the buoyancy chamber 1, the water filling and draining capacity of each buoyancy chamber 1 can be accurately controlled, so that the buoyancy size and distribution of the wet towing auxiliary unit as a whole can be flexibly adjusted according to different foundation structures and transportation conditions, and the submerged mud floating offshore wind turbine can always maintain a stable suspended state during transportation. Therefore, the above technical solution can solve the problem that the traditional wet towing method is limited in operation in severe sea conditions, and has the advantages of simple installation and low cost.

[0043] It can be understood that the shape of the buoyancy chamber 1 adopts a streamlined design, which can effectively reduce the frictional resistance with seawater during wet towing transportation, reduce the power required for towing, improve transportation efficiency, and also reduce the equipment shaking caused by water flow resistance after a large number of fluid mechanics simulation and test optimization.

[0044] As shown in Figure 6 three and six wet towing auxiliary units 100 can be arranged at the periphery of the submerged mud floating offshore wind turbine, and of course they can also be flexibly combined and disassembled according to actual different transportation needs, which will not be described here. That is, the wet towing auxiliary unit 100 adopts a modular design, which is convenient for batch manufacturing, and can be towed by a single wet towing auxiliary unit 100, or multiple wet towing auxiliary units 100 can be assembled together to provide buoyancy and escort stability for larger equipment, and even can be assembled into a large range of offshore towing auxiliary unit to provide good support for offshore rescue and ship repair. At the same time, each functional module (such as the self-weight system and the folding side wing 2) can be flexibly combined and disassembled according to different transportation needs. This design concept not only facilitates the manufacturing, installation and maintenance of the equipment, but also can be customized according to actual conditions, improving the universality and adaptability of the equipment.

[0045] In an embodiment of the present application, each wet towing auxiliary unit 100 further comprises a foldable side wing 2, which is connected to the buoyancy chamber 1 through a folding joint 21. If severe sea conditions occur during transportation, the side wing 2 is unfolded, otherwise the side wing 2 is closed.

[0046] In the embodiment, in the case of small wind and wave (i.e. normal sea conditions), the side wing 2 can be folded and stored to reduce the resistance during transportation; when encountering large wind and wave (i.e. severe sea conditions), the side wing 2 is quickly unfolded to increase the lateral stability of the wet towing auxiliary unit, resist the lateral force of the wind and wave on the wet towing auxiliary unit, and avoid dangerous situations such as overturning of the wet towing auxiliary unit.

[0047] As shown in Figure 3As shown, in one embodiment of the present application, the buoyancy tanks 1 are arranged in multiple layers in the vertical direction, and the number of buoyancy tanks 1 in each layer is at least two. A strip-shaped gap 11 is formed between each pair of adjacent buoyancy tanks 1 in each layer, and the strip-shaped gap 11 is used to pass seawater to dissipate wave energy.

[0048] In one embodiment of the present application, the strip-shaped gaps 11 in adjacent two layers are arranged in a staggered manner. In this way, when facing strong waves, the strip-shaped gaps 11 arranged in a staggered manner can dissipate the strong wind and waves, thereby protecting the structure and the towed part, and reducing the impact power of cross seas on the ship.

[0049] Please continue to see Figure 2 and Figure 5 In one embodiment of the present application, each wet tow auxiliary unit 100 further comprises a first connecting structure 3 and a second connecting structure 4. The first connecting structure 3 is arranged on both sides of the wet tow auxiliary unit 100, and the second connecting structure 4 is arranged in the middle of the wet tow auxiliary unit 100.

[0050] Step S1 comprises:

[0051] Connecting the arc-shaped connecting piece 200 between the first connecting structures 3 of the adjacent two wet tow auxiliary units 100.

[0052] Connecting one end of the linear connecting piece 300 to the limiting ring 400 on the submerged mud floating offshore wind turbine, and connecting the other end to the second connecting structure 4.

[0053] In this embodiment, by arranging the first connecting structure 3 on both sides of the wet tow auxiliary unit 100 and the second connecting structure 4 in the middle of the wet tow auxiliary unit 100, the connection of different wet tow auxiliary units 100 and the connection with the submerged mud floating offshore wind turbine can be realized.

[0054] In one embodiment of the present application, the second connecting structure 4 comprises a hydraulic buffer and a universal joint connected with the hydraulic buffer, and the universal joint is connected with the linear connecting piece 300.

[0055] In this embodiment, the hydraulic buffer type universal joint structure is adopted, which not only allows the submerged mud floating offshore wind turbine to rotate within a certain range, but also absorbs and buffers the impact force generated by rotation through the hydraulic buffer. At the same time, by reasonably designing the parameters of the hydraulic buffer, the angle and speed of rotation can be effectively limited, thereby realizing precise control of the degree of freedom of rotation.

[0056] In one embodiment of the present application, each wet tow auxiliary unit 100 further comprises a steel structure frame body 5, and the buoyancy tank 1, the side wing 2, the first connecting structure 3 and the second connecting structure 4 are arranged on the steel structure frame body 5. The steel structure frame body 5 is provided with a working bridge 51 for the walking of workers.

[0057] As shown in FIG. 1, in one embodiment of the present application, the steel structure frame body 5 includes a plurality of wet tow auxiliary units 50 arranged on both sides, and each wet tow auxiliary unit 50 includes a tow assembly 52 and a wet tow auxiliary unit 51. Figure 4 and Figure 5 As shown in FIG. 1, in one embodiment of the present application, the steel structure frame body 5 includes a plurality of wet tow auxiliary units 50 arranged on both sides, and each wet tow auxiliary unit 50 includes a tow assembly 52 and a wet tow auxiliary unit 51.

[0058] In this embodiment, the tension state of the tow cable 500 is changed by the tension sensor and the winch motor, realizing self-adaptive adjustment of the transportation environment of the submerged mud floating offshore wind turbine, and ensuring that the wet tow auxiliary unit is always in the best working state.

[0059] In one embodiment of the present application, the bottom of the steel structure frame body 5 is provided with a plurality of liftable anchor stocks 53. If severe sea conditions occur, the anchor stocks 53 sink, otherwise the anchor stocks 53 remain at the bottom of the steel structure frame body 5.

[0060] In this embodiment, during transportation, when it is necessary to increase the stability of the wet tow auxiliary unit, the anchor stocks 53 can be extended and inserted into the seabed mud layer to provide additional anchoring force to prevent the equipment from being displaced due to factors such as water flow and wind waves; after reaching the installation site, the anchor stocks 53 can be retracted, facilitating the disassembly and recovery of the wet tow auxiliary unit.

[0061] In some embodiments, the anchor stocks 53 can be extended and retracted by anchor chains (not shown in the figure) buried inside the steel structure frame body 5, which will not be described here.

[0062] In one embodiment of the present application, the steel structure frame body 5 includes a Z-direction limiting beam 54, a Y-direction limiting beam 55 and an X-direction limiting beam 56 connected vertically in sequence, a hydraulic buffer is arranged on the X-direction limiting beam 56 and can move along the X-direction limiting beam 56, the X-direction limiting beam 56 can move along the Y-direction limiting beam 55, and the Y-direction limiting beam 55 can move along the Z-direction limiting beam 54.

[0063] In this embodiment, by arranging the Z-direction limiting beam 54, the Y-direction limiting beam 55 and the X-direction limiting beam 56, the movement of the submerged mud floating offshore wind turbine in six degrees of freedom (translation in X, Y, Z axes and rotation around X, Y, Z axes) can be ensured, and its movement state (such as inclination state) can be monitored in real time by sensors. Once the movement trend is detected, the system responds quickly to generate a counteracting force using a driving mechanism (such as a motor, i.e. the movement of the hydraulic buffer, the X-direction limiting beam 56 and the Y-direction limiting beam 55 can be achieved by the motor, which will not be described here), efficiently suppressing the movement response of the submerged mud floating offshore wind turbine in each degree of freedom, and ensuring the stability of the transportation process.

[0064] It can be understood that each wet mop auxiliary unit 100 can be provided with at least two second connection structures 4, so that when one second connection structure 4 is damaged, the other second connection structure 4 can play a role of redundant backup.

[0065] In an embodiment of the present application, the X-direction limiting beam 56 is provided with a movable counterweight (not shown in the figure), and by monitoring the center of gravity position of the wet mop auxiliary unit and the submerged mud floating offshore wind turbine in real time, when the center of gravity deviates, by adjusting the position of the counterweight on the X-direction limiting beam 56, the center of gravity of the entire transportation system can be kept within a reasonable range at all times, thereby enhancing the stability during transportation.

[0066] The following will be described in combination with Figures 7 to 13 The submerged mud floating offshore wind turbine is introduced.

[0067] 1. Structure of the submerged mud floating offshore wind turbine

[0068] The submerged mud floating offshore wind turbine comprises, in sequence along the vertical direction, an upper wind turbine 10, a tower 20, a tower connecting piece 30, a foundation 40, an anchoring assembly 50 and a base 60; wherein the foundation 40 comprises a first cylinder 401, a second cylinder 402, a hemispherical cylinder 403, a plurality of pontoons 404, a plurality of edge bars 405, a plurality of bottom plates 406, a plurality of cross bars 407, a plurality of inclined braces 408 and an anchor chain winding and unwinding device 409; the anchoring assembly 50 comprises an anchor stock 501, a first water inlet and outlet hole 502 and a lateral anchor chain 503; the base 60 comprises a baffle 601, a second water inlet and outlet hole 602, a partition cabin 603 and a vertical anchor chain 604.

[0069] 2. Installation stage of the submerged mud floating offshore wind turbine

[0070] After the submerged mud floating offshore wind turbine is towed to the designated position on the sea surface, the anchor chain winding and unwinding device 409 loosens each anchor chain, keeping the base 60 and the anchor stock 501 in a balanced state, so as to sink them along the vertical direction to the seabed based on gravity;

[0071] After the base 60 and the anchor stock 501 complete self-weight sinking, the base 60 and the anchor stock 501 are kept in a balanced state, and water is pumped out through the first water inlet and outlet hole 502 in the sidewall of the base 60 and the anchor stock 501 to form a large pressure difference between the inside and outside of the base 60 and the anchor stock 501, so as to perform suction settlement;

[0072] After the base 60 and the anchor stock 501 are both sunk to the designated depth and the designated longitude and latitude, the foundation 40 is kept in a balanced state, and each anchor chain is tightened until the upper wind turbine reaches the designated working height;

[0073] During the process of tightening each anchor chain, the tension of each anchor chain is obtained at certain time intervals to ensure that the tension of each anchor chain is always less than the tension threshold value, so as to ensure that the submarine mud floating offshore wind turbine successfully completes the installation and subsequent normal work.

[0074] In some embodiments, the base 60 and the anchor stock 501 are kept in a balanced state to be respectively sunk to the seabed along the vertical direction based on gravity, including:

[0075] If the base 60 and the anchor stock 501 are greatly inclined, the release rate of the anchor chain on the side that is inclined downward is reduced, and the release rate of the anchor chain on the side that is inclined upward is increased, so as to ensure that the base 60 and the anchor stock 501 are stably self-sunk to the seabed.

[0076] In some embodiments, the base 60 and the anchor stock 501 are kept in a balanced state, and water is pumped out through the first water inlet and outlet hole 502 on the side wall of the base 60 and the anchor stock 501 to form a large pressure difference between the inside and outside of the base 60 and the anchor stock 501, so as to perform suction sinking, including:

[0077] If the base 60 and the anchor stock 501 are greatly inclined, the base 60 and the anchor stock 501 reduce the water pumping rate on the side that is inclined downward, and increase the water pumping rate on the side that is inclined upward, wherein the water pumping rate on the side of the lowermost end of the base 60 and the anchor stock 501 is the smallest, and the water pumping rate of the first water inlet and outlet hole 502 gradually increases in the direction away from the lowermost end, so as to ensure that the base 60 and the anchor stock 501 are stably completed.

[0078] In some embodiments, the base 40 is kept in a balanced state, and each anchor chain is tightened until the upper wind turbine reaches the specified working height, including:

[0079] If the base 40 is greatly inclined, the tightening rate of the anchor chain on the side that is inclined downward is reduced, and the tightening rate of the anchor chain on the side that is inclined upward is increased, so as to ensure that the base 40 and the upper wind turbine stably reach the specified working height.

[0080] 3. Recovery stage of the submarine mud floating offshore wind turbine

[0081] After the tugboat reaches the specified position, water is pumped into the base 60 and the anchor stock 501 through the first water inlet and outlet hole 502 on the side wall to keep the base 60 and the anchor stock 501 in a balanced state, so as to lift the base 60 and the anchor stock 501 out of the mud surface based on the pressure difference formed between the inside and outside of the base 60 and the anchor stock 501;

[0082] The base 40 is kept in a balanced state, and the anchor chain release device 409 is adjusted to tighten the anchor chain to pull the base 60 and the anchor stock 501 away from the seabed surface until the base 60 and the anchor stock 501 abut against the base 40.

[0083] After the base 60 and the anchor spindle 501 abut against the foundation 40, the whole submarine mud floating offshore wind turbine is bound, and the wind turbine is wet towed to the designated recovery point by a tugboat for recovery;

[0084] During the tightening of each anchor chain, the tension of each anchor chain is obtained at certain time intervals to ensure that the tension of the anchor chain is always less than the tension threshold, so as to ensure the smooth and complete recovery of the submarine mud floating offshore wind turbine.

[0085] In some embodiments, the base 60 and the anchor spindle 501 are kept in a balanced state to lift them out of the mud surface based on the pressure difference formed inside and outside the base 60 and the anchor spindle 501, including:

[0086] Water is supplied to the base 60 and the anchor spindle 501 through the second water inlet / outlet hole 602, and if the base 60 and the anchor spindle 501 are greatly inclined, the water supply rate to the side inclined downward is increased, and the water supply rate to the side inclined upward is decreased, wherein the water supply rate to the side of the lowermost end of the base 60 and the anchor spindle 501 is the largest, and the water supply rate of the first water inlet / outlet hole 502 gradually decreases in the direction away from the lowermost end, so as to ensure that the base 60 and the anchor spindle 501 are smoothly lifted out of the mud surface.

[0087] In some embodiments, the foundation 40 is kept in a balanced state, and the anchor chain take-up device 409 is adjusted to tighten the anchor chain to pull the base 60 and the anchor spindle 501 away from the seabed surface until the base 60 and the anchor spindle 501 abut against the foundation 40, including:

[0088] If the base 60 and the anchor spindle 501 are greatly inclined, the tightening rate of the anchor chain on the side inclined downward is increased, and the tightening rate of the anchor chain on the side inclined upward is decreased, so as to ensure that the base 60 and the anchor spindle 501 are smoothly lifted until they abut against the foundation 40.

[0089] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0090] 1) The loosening rate of the anchor chain is controlled by the anchor chain take-up device to adapt to the inclination state of the base and the anchor spindle during sinking, to adjust the center of gravity distribution and ensure the overall balance, thereby reducing the risk of overturning caused by uneven sinking of the equipment.

[0091] 2) The water is pumped out through the water inlet / outlet hole of the side wall of the base and the anchor spindle to form the pressure difference inside and outside, so as to ensure that the base and the anchor spindle can be smoothly, quickly and accurately sunk to the designated position. Compared with the traditional gravity sinking or mechanical insertion method, the energy consumption of the suction sinking is lower and the efficiency is higher.

[0092] 3) During the installation process, the tension of each anchor chain is monitored by sensors, combined with dynamic control algorithms, to keep the tension within a safe and effective range, reducing the risk of anchor chain breakage due to excessive tension and foundation instability or position deviation due to insufficient tension.

[0093] 4) The integrated recovery method is adopted, and the base and anchor spindle are recovered as a whole after abutting against the foundation, simplifying the complex process of traditional offshore foundation recovery and improving the operation efficiency.

[0094] 5) The installation and recovery method has strong compatibility and is suitable for various types of seabed conditions such as soft mud, sandy and rocky seabed. Through suction settlement and dynamic balance control, it can effectively cope with the differences in bearing capacity and stability of different seabeds, expand its application range, and improve the adaptability of offshore foundations in complex marine environments and harsh weather conditions.

[0095] 6) During installation and recovery, lateral anchor chains provide direct constraints on lateral disturbances, and vertical anchor chains further enhance the anti-deviation ability through evenly distributed tension. It can effectively prevent the accumulation of lateral displacement caused by external disturbances such as ocean currents, waves, etc., reducing the time and equipment collision and wear caused by multiple adjustments and repositioning due to lateral displacement. This efficient installation method not only significantly improves installation efficiency, but also reduces equipment wear and tear, extends equipment life and reduces maintenance costs.

[0096] 7) Throughout the installation and recovery process, by monitoring key links such as anchor chain retraction rate, anchor chain tension, foundation inclination angle and water pumping and filling rate in real time, combined with dynamic balance control, it can respond to sudden situations. For example, local subsidence or inclination caused by seabed geological differences, and sinking deviation caused by uneven seabed or water flow, through dynamic adjustment of anchor chain and water pumping and filling rate, real-time correction of base and anchor spindle inclination and deviation, to ensure the overall balance and adaptability of the foundation.

[0097] 8) During installation and recovery, through anchor chain control and precise water pumping and filling operations, the movement speed of the base and anchor spindle can be effectively controlled, allowing it to sink or lift smoothly and stably into the seabed, reducing mechanical impact and ecological damage to the seabed, and meeting the requirements of sustainable development.

[0098] 9) In the design of installation and recovery, the use of complex and large-scale lifting equipment is minimized, and simple and effective techniques such as anchor chain control and suction settlement are used to complete the main steps in a shorter time, reducing construction equipment costs and installation time, while further improving construction safety and stability, reducing subsequent maintenance costs, and achieving both economic and efficiency improvements.

[0099] 10) precise control mechanism in installation recycling process, such as real-time monitoring, smooth operation, etc. to minimize the damage of the equipment during construction process, maintain high integrity and functionality of the equipment, and improve the re-use value of the equipment.

[0100] It should be noted that, in this document, relational terms such as one and the other and the first and the second, etc. are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0101] Finally, it should be noted that the above-described embodiments are merely possible implementations of the present application, and are not used to limit the protective scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protective scope of the present application.

Claims

1. A method for installing and recovering a submersible mud-floating offshore wind turbine system, characterized in that, include: Step S1, Installation stage of wet towing auxiliary units: Install at least two wet towing auxiliary units onto the outer periphery of the submersible mud-floating offshore wind turbine; wherein, two adjacent wet towing auxiliary units are connected by arc-shaped connectors, the submersible mud-floating offshore wind turbine and the wet towing auxiliary units are connected by linear connectors, each wet towing auxiliary unit includes multiple interconnected buoyancy chambers, and each buoyancy chamber is equipped with an air-water replacement valve; Step S2, Transportation phase of wet towing auxiliary unit: The tugboat is fixed to two of the wet towing auxiliary units by towing cables, and the inflation and deflation of each buoyancy chamber is controlled by the air-water replacement valve during transportation to ensure the stability of the submersible mud-floating offshore wind turbine during transportation. Step S3, Removal of Wet Towing Auxiliary Units: After reaching the destination, shut off the power and control sources of all wet towing auxiliary units, and release the submersible mud-floating offshore wind turbine and the wet towing auxiliary units to remove the wet towing auxiliary units from the submersible mud-floating offshore wind turbine. Step S4, Installation phase of submersible and floating offshore wind turbines: Step S5, Recovery Phase of Submersible Mud-Floating Offshore Wind Turbine: Step S6: Repeat steps S1 to S3; Each of the aforementioned wet towing auxiliary units also includes a foldable side wing, which is connected to the buoyancy chamber via a folding joint. If severe sea conditions occur during transport, the side wing is deployed; otherwise, the side wing is closed. Along the vertical direction, the buoyancy chamber is provided in multiple layers, with at least two buoyancy chambers in each layer. A strip-shaped gap is formed between two adjacent buoyancy chambers in each layer, and the strip-shaped gap is used to allow seawater to pass through. The strip gaps between adjacent layers are staggered. Each of the wet mopping auxiliary units further includes a first connecting structure and a second connecting structure, wherein the first connecting structure is disposed on both sides of the wet mopping auxiliary unit and the second connecting structure is disposed in the middle of the wet mopping auxiliary unit; Step S1 includes: The arc-shaped connector is connected between the first connection structures of two adjacent wet mopping auxiliary units; One end of the linear connector is connected to the limiting ring on the submersible floating offshore wind turbine, and the other end is connected to the second connecting structure. The second connection structure includes a hydraulic buffer and a universal joint connected to the hydraulic buffer, wherein the universal joint and the linear connector are connected. Each of the aforementioned wet towing auxiliary units also includes a steel structure frame, on which the buoyancy chamber, the side wings, the first connecting structure, and the second connecting structure are all mounted; The steel structure frame includes towing assemblies on both sides. Each towing assembly includes a tension sensor and a winch motor. The winch motor is connected to a towing cable through the tension sensor. The tension sensor is used to detect the tension of the towing cable, and the winch motor is used to change the length of the towing cable so that the tension of the two tension sensors is the same. The bottom of the steel structure frame is equipped with multiple liftable anchors. If severe sea conditions occur during transportation, the anchors will be lowered; otherwise, the anchors will remain at the bottom of the steel structure frame.

2. The method according to claim 1, characterized in that, The steel structure frame is equipped with a temporary working bridge for workers to walk on.

3. The method according to claim 2, characterized in that, The steel frame includes a Z-direction limiting beam, a Y-direction limiting beam, and an X-direction limiting beam connected vertically in sequence. The hydraulic buffer is disposed on the X-direction limiting beam and can move along the X-direction limiting beam. The X-direction limiting beam can move along the Y-direction limiting beam, and the Y-direction limiting beam can move along the Z-direction limiting beam.

Images