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

Abstract

The invention relates to the technical field of offshore wind turbines, in particular to an installation and recovery method of a submersible mud floating type offshore wind turbine system. The method comprises the following steps: S1, mounting stage of wet-mopping auxiliary units: mounting at least two wet-mopping auxiliary units on the periphery of the submersible mud floating type offshore wind turbine; s2, the transportation stage of the wet dragging auxiliary units, wherein a tugboat is fixed to two of the wet dragging auxiliary units through a dragging cable, and the water filling and discharging amount of each buoyancy compartment is controlled through an air-water replacement valve in the transportation process; s3, a dismounting stage of the wet mopping auxiliary units: after a destination is reached, power sources and control sources of all the wet mopping auxiliary units are closed, and fixation of the submersible mud floating type offshore wind turbine and the wet mopping auxiliary units is relieved; s4, the installation stage of the submersible mud floating type offshore wind turbine; S5, the recovery stage of the submersible mud floating type offshore wind turbine; and S6, the steps S1 to S3 are executed repeatedly. According to the technical scheme, the problem that a traditional wet mopping mode is limited in operation under severe sea conditions can be solved, installation is easy and convenient, and cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind turbines, and in particular to an installation and recovery method for a submersible mud-floating offshore wind turbine system. Background Art

[0002] With the growing energy crisis, offshore wind power, as a renewable energy source, has become a crucial component of the current energy mix and a crucial energy source for resolving the crisis. Wet towing is a common technique for transporting submersible, mud-floating offshore wind turbines. By using a tugboat to pull the turbine structure, it simplifies offshore operations and reduces costs and risks. In related technologies, after transporting the offshore wind turbine system to the designated sea area, installation requires significant manpower and material resources, resulting in a complex installation process.

[0003] Therefore, there is an urgent need to provide an installation and recovery method for a submersible mud-floating offshore wind turbine system to solve the above technical problems. Summary of the Invention

[0004] The invention provides an installation and recovery method for a submersible mud-floating offshore wind turbine system, which is simple to install and low in cost.

[0005] An embodiment of the present invention provides a method for installing and recovering a submersible mud-floating offshore wind turbine system, comprising:

[0006] Step S1, installation of wet towing auxiliary units: installing at least two wet towing auxiliary units on the periphery of a submersible mud-floating offshore wind turbine; wherein two adjacent wet towing auxiliary units are connected by an arc-shaped connector, and the submersible mud-floating offshore wind turbine and the wet towing auxiliary units are connected by a linear connector; each wet towing auxiliary unit includes a plurality of interconnected buoyancy compartments, and each buoyancy compartment is provided with an air-water displacement valve;

[0007] Step S2, transport phase of the wet towing auxiliary unit: securing the tugboat to two of the wet towing auxiliary units via towing cables, and controlling the filling and drainage volume of each buoyancy compartment using the air-water displacement valve during transportation to ensure the stability of the submersible mud-floating offshore wind turbine during transportation;

[0008] Step S3, dismantling of the wet towing auxiliary units: after arriving at the destination, shutting down the power sources and control sources of all wet towing auxiliary units, and releasing the submersible mud-floating offshore wind turbine from the wet towing auxiliary units, so that the wet towing auxiliary units are dismantled from the submersible mud-floating offshore wind turbine;

[0009] Step S4, installation phase of submersible mud-floating offshore wind turbine:

[0010] Step S5, recovery phase of the submersible mud-floating offshore wind turbine:

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

[0012] Beneficial effects:

[0013] According to the installation and recovery method for a submersible mud-floating offshore wind turbine system provided by an embodiment of the present invention, by connecting multiple wet-tow auxiliary units to the periphery of the submersible mud-floating offshore wind turbine and utilizing the air-water displacement valves of the buoyancy compartments, the filling and drainage volume of each buoyancy compartment can be precisely controlled. This allows the overall buoyancy and distribution of the wet-tow auxiliary units to be flexibly adjusted according to different foundation structures and transportation conditions, ensuring that the submersible mud-floating offshore wind turbine remains in a stable suspended state during transportation. Therefore, the above technical solution can solve the problem of traditional wet-tow methods that restrict operations in harsh sea conditions, and is simple to install and low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 Schematic diagram of the process of installing and recovering a submersible mud-floating offshore wind turbine system according to an embodiment of the present invention;

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

[0017] Figure 3 for Figure 2 a rear view of the wet mopping assist unit shown;

[0018] Figure 4 for Figure 2 Schematic diagram of the application scenario of the wet mopping auxiliary unit shown;

[0019] Figure 5 for Figure 4 A partially enlarged schematic diagram of the application scenario shown;

[0020] Figure 6 for Figure 2 Schematic diagrams of two other application scenarios of the wet mopping auxiliary unit shown;

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

[0022] Figure 8 for Figure 7 The schematic diagram of the structure of the foundation, anchoring assembly and base of the submersible mud-floating offshore wind turbine shown;

[0023] Figure 9 for Figure 8 a front view of the foundation, anchor assembly, and pedestal shown;

[0024] Figure 10 for Figure 8 A schematic diagram of the structure of the anchor chain retracting and releasing device in the foundation shown;

[0025] Figure 11 for Figure 8 A schematic diagram of the structure of the anchor in the anchor assembly shown;

[0026] Figure 12 for Figure 8 A schematic structural diagram of the base shown;

[0027] Figure 13 for Figure 12 Bottom view of the base shown.

[0028] Reference numerals:

[0029] 100-wet towing auxiliary unit; 200-arc-shaped connector; 300-linear connector; 400-limiting ring; 500-towing rope;

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

[0031] 10-upper fan; 20-tower; 30-tower connector; 40-foundation; 50-anchor assembly; 60-base;

[0032] 401-first cylinder; 402-second cylinder; 403-hemispherical cylinder; 404-buoy; 405-side bar; 406-bottom plate; 407-cross bar; 408-diagonal brace; 409-anchor chain retracting and releasing device; 501-anchor; 502-first water inlet and outlet; 503-lateral anchor chain; 601-baffle; 602-second water inlet and outlet; 603-dividing compartment; 604-vertical anchor chain. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] A submersible mud-floating offshore wind turbine refers to a wind turbine whose foundation can be converted between a fully submerged suspended state, a semi-submerged suspended state and a mud-floating state. The fully submerged suspended state means that the foundation is suspended in the seawater. In this state, the upper wind turbine works at a higher height, which is conducive to improving power generation efficiency and is suitable for conditions with better marine environment; the semi-submerged suspended state means that the foundation is suspended on the sea surface. In this state, the upper wind turbine works at the highest height, which is more conducive to improving power generation efficiency and is also suitable for conditions with better marine environment; the mud-floating state means that the foundation is fixed in the mud layer on the seabed. In this state, the upper wind turbine works at a lower height, which is conducive to improving safety and is suitable for conditions with harsher marine environment.

[0035] like Figure 1 、 Figure 2 and Figure 4 As shown, an embodiment of the present invention provides an installation and recovery method for a submersible mud-floating offshore wind turbine system, comprising:

[0036] Step S1, installation of the wet towing auxiliary unit 100: at least two wet towing auxiliary units 100 are installed on the periphery of the submersible mud-floating offshore wind turbine; wherein, two adjacent wet towing auxiliary units 100 are connected by an arc-shaped connector 200, and the submersible mud-floating offshore wind turbine and the wet towing auxiliary unit 100 are connected by a linear connector 300. Each wet towing auxiliary unit 100 includes a plurality of interconnected buoyancy compartments 1, and each buoyancy compartment 1 is provided with an air-water displacement valve (not shown in the figure);

[0037] Step S2, transport phase of the wet towing auxiliary unit 100: The tugboat is fixed to two of the wet towing auxiliary units 100 via the towing rope 500, and the air-water displacement valve is used to control the filling and drainage volume of each buoyancy compartment 1 during transportation to ensure the stability of the submersible mud-floating offshore wind turbine during transportation;

[0038] Step S3, dismantling the wet towing auxiliary unit 100: After arriving at the destination, shut down the power source and control source of all wet towing auxiliary units 100, and release the submersible mud-floating offshore wind turbine and the wet towing auxiliary unit 100 from the submersible mud-floating offshore wind turbine, so that the wet towing auxiliary unit 100 is removed from the submersible mud-floating offshore wind turbine;

[0039] Step S4, installation phase of submersible mud-floating offshore wind turbine:

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

[0041] Step S6: Repeat steps S1 to S3.

[0042] In this embodiment, by connecting multiple wet-towing auxiliary units 100 to the periphery of a submersible mud-floating offshore wind turbine and utilizing the air-water displacement valves of the buoyancy compartments 1, the filling and drainage volume of each buoyancy compartment 1 can be precisely controlled. This allows for flexible adjustment of the overall buoyancy and distribution of the wet-towing auxiliary units to suit varying infrastructure and transportation conditions, ensuring that the submersible mud-floating offshore wind turbine remains stably suspended during transportation. Therefore, this technical solution addresses the operational limitations of traditional wet-towing methods in harsh sea conditions, while also being simple to install and low-cost.

[0043] It can be understood that the buoyancy tank 1 adopts a streamlined design. After a large number of fluid mechanics simulations and experimental optimizations, it can effectively reduce the friction 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.

[0044] like Figure 6 As shown, three and six wet towing auxiliary units 100 can be arranged on the periphery of the submersible mud-floating offshore wind turbine. Of course, they can also be flexibly combined and disassembled according to different actual transportation needs, which will not be elaborated here. In other words, the wet towing auxiliary unit 100 adopts a modular design, which is convenient for mass production. It 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. They can even be assembled into a large range of marine towing auxiliary units to provide good support for marine rescue and ship repair. At the same time, various functional modules (such as the self-balanced weight system and the folding side wings 2) can be flexibly combined and disassembled according to different transportation needs. This design concept not only facilitates the manufacture, installation and maintenance of the equipment, but also allows customized configuration according to actual conditions, thereby improving the versatility and adaptability of the equipment.

[0045] In one embodiment of the present invention, each wet mopping auxiliary unit 100 further includes foldable side wings 2, which are connected to the buoyancy chamber 1 via folding joints 21. If severe sea conditions occur during transportation, the side wings 2 are unfolded, otherwise the side wings 2 are closed.

[0046] In this embodiment, when the wind and waves are relatively small (i.e., normal sea conditions), the side wings 2 can be folded and stowed to reduce resistance during transportation; when encountering larger wind and waves (i.e., severe sea conditions), the side wings 2 are quickly unfolded to increase the lateral stability of the wet towing auxiliary unit, resist the lateral force of the wind and waves on the wet towing auxiliary unit, and avoid dangerous situations such as the wet towing auxiliary unit rolling over.

[0047] like Figure 3As shown, in one embodiment of the present invention, multiple layers of buoyancy tanks 1 are provided in the vertical direction, with at least two buoyancy tanks 1 on each layer, and strip gaps 11 are formed between two adjacent buoyancy tanks 1 on each layer. The strip gaps 11 are used to allow seawater to pass through to dissipate wave energy.

[0048] In one embodiment of the present invention, two adjacent layers of strip gaps 11 are staggered. This arrangement allows the staggered strip gaps 11 to dissipate energy in the face of strong waves, providing a certain degree of protection for the ship's structure and drag, while also reducing the impact of cross waves on the ship.

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

[0050] Step S1 includes:

[0051] Connect the arc-shaped connecting member 200 between the first connecting structures 3 of two adjacent wet mopping auxiliary units 100;

[0052] One end of the linear connector 300 is connected to the limiting ring 400 on the submersible mud-floating offshore wind turbine, and the other end is connected to the second connecting structure 4 .

[0053] In this embodiment, by providing the first connection structure 3 located on both sides of the wet mopping auxiliary unit 100 and the second connection structure 4 located in the middle of the wet mopping auxiliary unit 100, connection between different wet mopping auxiliary units 100 and connection with a submersible mud-floating offshore wind turbine can be achieved.

[0054] In one embodiment of the present invention, the second connection structure 4 includes a hydraulic buffer and a universal joint connected to the hydraulic buffer, and the universal joint is connected to the linear connection member 300 .

[0055] In this embodiment, a hydraulically buffered universal joint structure is adopted, which not only allows the submersible mud-floating offshore wind turbine to rotate within a certain range, but also absorbs and buffers the impact force generated by the 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 restricted, thereby achieving precise control of the rotational freedom.

[0056] In one embodiment of the present invention, each wet mopping auxiliary unit 100 also includes a steel structure frame 5, and the buoyancy tank 1, the side wing 2, the first connecting structure 3 and the second connecting structure 4 are all arranged on the steel structure frame 5, and a working bridge 51 for staff to walk on is provided on the steel structure frame 5.

[0057] like Figure 4 and Figure 5 As shown, in one embodiment of the present invention, the steel structure frame 5 includes a towing assembly 52 arranged on both sides, the towing assembly 52 includes a tension sensor (not shown in the figure) and a winch motor, the winch motor is connected to the towing cable 500 through the tension sensor, the tension sensor is used to detect the tension of the towing cable 500, and the winch motor is used to change the length of the towing cable 500 so that the tension of the two tension sensors is the same.

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

[0059] In one embodiment of the present invention, a plurality of liftable anchors 53 are provided at the bottom of the steel structure frame 5 . If severe sea conditions occur, the anchors 53 sink; otherwise, the anchors 53 remain at the bottom of the steel structure frame 5 .

[0060] In this embodiment, during transportation, when it is necessary to increase the stability of the wet towing auxiliary unit, the anchor 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, wind and waves; after arriving at the installation site, the anchor 53 can be retracted to facilitate the disassembly and recovery of the wet towing auxiliary unit.

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

[0062] In one embodiment of the present invention, the steel structure frame 5 includes a Z-direction limiting beam 54, a Y-direction limiting beam 55 and an X-direction limiting beam 56 that are vertically connected in sequence. The 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 providing a Z-limiting beam 54, a Y-limiting beam 55, and an X-limiting beam 56, the submersible mud-floating offshore wind turbine can be guaranteed to move in six degrees of freedom (translation along the X, Y, and Z axes, and rotation about the X, Y, and Z axes). Sensors can be used to monitor its motion state (e.g., inclination angle) in real time. Once a motion trend is detected, the system responds quickly, utilizing a drive mechanism (e.g., a motor, which can be used to move the hydraulic buffer, X-limiting beam 56, and Y-limiting beam 55, which will not be described in detail here) to generate a counterforce, effectively suppressing the motion response of the submersible mud-floating offshore wind turbine in each degree of freedom and ensuring stability during transportation.

[0064] It is understandable that each wet mopping auxiliary unit 100 may be provided with at least two second connecting structures 4, so that when one second connecting structure 4 is damaged, the other second connecting structure 4 can serve as a redundant backup.

[0065] In one embodiment of the present invention, the X-axis limiting beam 56 is provided with a movable counterweight (not shown in the figure). By real-time monitoring of the center of gravity of the wet-towing auxiliary unit and the submersible mud-floating offshore wind turbine, when the center of gravity shifts, the position of the counterweight on the X-axis limiting beam 56 is adjusted, so that the center of gravity of the entire transportation system can always be kept within a reasonable range, thereby enhancing stability during transportation.

[0066] The following combination Figures 7 to 13 Introducing submersible mud-floating offshore wind turbines.

[0067] 1. Structure of submersible mud-floating offshore wind turbine

[0068] The submersible mud-floating offshore wind turbine includes an upper wind turbine 10, a tower 20, a tower connector 30, a foundation 40, an anchor assembly 50 and a base 60 arranged in sequence along a vertical direction; wherein the foundation 40 includes a first cylinder 401, a second cylinder 402, a hemispherical cylinder 403, multiple buoys 404, multiple side rods 405, multiple bottom plates 406, multiple cross rods 407, multiple diagonal braces 408 and an anchor chain retraction device 409; the anchor assembly 50 includes an anchor 501, a first water inlet and outlet hole 502 and a lateral anchor chain 503; the base 60 includes a baffle 601, a second water inlet and outlet hole 602, a partition cabin 603 and a vertical anchor chain 604.

[0069] 2. Installation phase of submersible mud-floating offshore wind turbines

[0070] After the submersible mud-floating offshore wind turbine is towed to the designated location on the sea surface, the anchor chain retracting device 409 releases each anchor chain to keep the base 60 and the anchor 501 in a balanced state so that they can be lowered vertically to the seabed based on gravity.

[0071] After the base 60 and the anchor 501 have completed sinking by their own weight, the base 60 and the anchor 501 are kept in a balanced state, and water is pumped out through the first water inlet and outlet holes 502 on the side walls of the base 60 and the anchor 501 to form a large pressure difference inside and outside the base 60 and the anchor 501, thereby performing suction sedimentation;

[0072] After the base 60 and anchor 501 are sunk to the specified depth and specified 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 specified working height;

[0073] During the process of tightening each anchor chain, the tension of each anchor chain is obtained at regular time intervals to ensure that the tension of the anchor chain is always less than its tensioning threshold, so as to ensure the smooth installation and subsequent normal operation of the submersible mud-floating offshore wind turbine.

[0074] In some embodiments, maintaining the base 60 and the anchor 501 in a balanced state so as to vertically lower them to the seabed based on gravity includes:

[0075] If the base 60 and the anchor 501 are tilted significantly, the release rate of the anchor chain on the downward tilted side is reduced, and the release rate of the anchor chain on the upward tilted side is increased to ensure that the base 60 and the anchor 501 sink steadily to the seabed by their own weight.

[0076] In some embodiments, the base 60 and the anchor 501 are kept in a balanced state, and water is pumped outward through the first water inlet and outlet holes 502 on the side walls of the base 60 and the anchor 501 to form a large pressure difference between the inside and outside of the base 60 and the anchor 501, thereby performing suction sedimentation, including:

[0077] Water is pumped from the base 60 and the anchor 501 through the water inlet and outlet holes. If the base 60 and the anchor 501 are tilted significantly, the pumping rate of the base 60 and the anchor 501 is reduced on the downwardly tilted side, and the pumping rate is increased on the upwardly tilted side. The pumping rate on the lowermost side of the base 60 and the anchor 501 is the smallest, and the pumping rate of the first water inlet and outlet holes 502 is gradually increased in the direction away from the lowermost end to ensure that the base 60 and the anchor 501 are smoothly lowered by suction.

[0078] In some embodiments, maintaining the foundation 40 in a balanced state and tightening each anchor chain until the upper wind turbine reaches a designated working height includes:

[0079] If the foundation 40 is tilted significantly, the tightening rate of the anchor chain on the downward tilted side is reduced, and the tightening rate of the anchor chain on the upward tilted side is increased to ensure that the foundation 40 and the upper wind turbine reach the specified working height smoothly.

[0080] 3. Recovery stage of submersible mud-floating offshore wind turbines

[0081] After the tugboat arrives at the designated location, it supplies water to the base 60 and the anchor 501 through the first water inlet and outlet holes 502 on the side walls thereof, keeping the base 60 and the anchor 501 in a balanced state, and lifting them out of the mud surface due to the pressure difference between the inside and outside of the base 60 and the anchor 501;

[0082] Keeping the foundation 40 in a balanced state, adjust the anchor chain retracting device 409 to tighten the anchor chain to pull the base 60 and the anchor 501 away from the seabed until the base 60 and the anchor 501 abut against the foundation 40;

[0083] After the base 60 and the anchor 501 are abutted against the foundation 40, the submersible mud-floating offshore wind turbine is bound as a whole and wet-towed by a tugboat to a designated recycling point for recycling;

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

[0085] In some embodiments, maintaining the base 60 and the anchor 501 in a balanced state so as to lift the base 60 and the anchor 501 out of the mud surface based on the pressure difference between the base 60 and the anchor 501 includes:

[0086] Water is supplied to the base 60 and the anchor 501 through the second water inlet and outlet holes 602. If the base 60 and the anchor 501 are greatly tilted, the water supply rate of the base 60 and the anchor 501 is increased on the downwardly tilted side, and the water supply rate is reduced on the upwardly tilted side. Among them, the water supply rate on the lowermost end of the base 60 and the anchor 501 is the largest. In the direction away from the lowermost end, the water supply rate of the first water inlet and outlet holes 502 is gradually reduced to ensure that the base 60 and the anchor 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 retracting device 409 is adjusted to tighten the anchor chain to pull the base 60 and the anchor 501 away from the seabed until the base 60 and the anchor 501 abut against the foundation 40, including:

[0088] If the base 60 and the anchor 501 are greatly tilted, the tightening rate of the anchor chain on the downward tilted side is increased, and the tightening rate of the anchor chain on the upward tilted side is reduced to ensure that the base 60 and the anchor 501 rise smoothly until they abut against the foundation 40.

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

[0090] 1) The anchor chain retracting and releasing device is used to control the release rate of the anchor chain to adapt to the possible tilt of the base and anchor during the sinking process, adjust the center of gravity distribution, ensure the overall balance, and reduce the risk of overturning caused by uneven sinking of the equipment.

[0091] 2) Water is pumped out through the inlet and outlet holes on the side walls of the base and anchor to create an internal and external pressure difference, ensuring that the base and anchor can be lowered smoothly, quickly, and accurately into the designated position. Compared with traditional gravity settling or mechanical insertion methods, suction settling uses less energy and is more efficient.

[0092] 3) When tightening the anchor chains during installation, sensors monitor the tension of each anchor chain. Combined with a dynamic control algorithm, the tension is always kept within a safe and effective range, which can reduce the risk of anchor chain breakage caused by excessive tension and foundation shaking or position deviation caused by insufficient tension.

[0093] 4) An integrated recovery method is adopted, where the base and anchor are recovered as a whole after they are in contact with the foundation, which simplifies the complex process of traditional offshore foundation recovery and improves operational efficiency.

[0094] 5) The installation and recovery method is highly compatible and applicable to a variety of seabed conditions, including soft mud, sand, and rocky seabeds. Through suction settling and dynamic balance control, it can effectively address the differences in bearing capacity and stability of different seabeds, expanding its application range and improving the adaptability of offshore foundations in complex marine environments and adverse weather conditions.

[0095] 6) During installation and retrieval, the lateral anchor chains provide a direct constraint on lateral disturbances, while the vertical anchor chains further enhance the system's resistance to drift by evenly distributing tension. This effectively prevents the accumulation of lateral displacement caused by external disturbances such as currents and waves, reducing the time required for multiple adjustments and repositioning, as well as the impact and wear on equipment caused by lateral displacement. This highly efficient installation method not only significantly improves installation efficiency, but also reduces equipment wear, extends its service life, and reduces maintenance costs.

[0096] 7) Throughout the installation and recovery process, real-time monitoring of key aspects such as the anchor chain retraction and release rate, anchor chain tension, foundation inclination angle, and water pumping and filling rates, combined with dynamic balance control, enables immediate response to unexpected situations. For example, localized subsidence or tilt due to seabed geology differences, or sinking deviation due to seabed unevenness or water flow, can be corrected in real time by dynamically adjusting the anchor chain and water pumping and filling rates to ensure the overall balance and adaptability of the foundation.

[0097] 8) During the installation and recovery process, the movement speed of the base and anchor can be effectively controlled through anchor chain control and precise pumping and water delivery operations, so that they can sink into or lift out of the seabed gently and smoothly, reducing the 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 lifting equipment is minimized. Simple and effective technologies such as anchor chain control and suction settlement are used to complete the main steps in a shorter time, reducing the cost of construction equipment and installation time. At the same time, the safety and stability of construction are further improved, the subsequent maintenance costs are reduced, and the dual improvement of economy and efficiency is achieved.

[0099] 10) Precise control mechanisms such as real-time monitoring and smooth operation during the installation and recycling process minimize the damage to the equipment during the construction process, maintain the high integrity and functionality of the equipment, and improve the reuse value of the equipment.

[0100] It should be noted that, in this document, relational terms such as primary and secondary are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical factors in the process, method, article, or device comprising the element.

[0101] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is intended only to illustrate the technical solution of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A method for installing and recovering a submersible mud-floating offshore wind turbine system, characterized in that: include: Step S1, installation of wet towing auxiliary units: installing at least two wet towing auxiliary units on the periphery of a submersible mud-floating offshore wind turbine; wherein two adjacent wet towing auxiliary units are connected by an arc-shaped connector, and the submersible mud-floating offshore wind turbine and the wet towing auxiliary units are connected by a linear connector; each wet towing auxiliary unit includes a plurality of interconnected buoyancy compartments, and each buoyancy compartment is provided with an air-water displacement valve; Step S2, transport phase of the wet towing auxiliary unit: securing the tugboat to two of the wet towing auxiliary units via towing cables, and controlling the filling and drainage volume of each buoyancy compartment using the air-water displacement valve during transportation to ensure the stability of the submersible mud-floating offshore wind turbine during transportation; Step S3, dismantling of the wet towing auxiliary units: after arriving at the destination, shutting down the power sources and control sources of all wet towing auxiliary units, and releasing the submersible mud-floating offshore wind turbine from the wet towing auxiliary units, so that the wet towing auxiliary units are dismantled from the submersible mud-floating offshore wind turbine; Step S4, installation phase of submersible mud-floating offshore wind turbine: Step S5, recovery phase of the submersible mud-floating offshore wind turbine: Step S6: Repeat steps S1 to S3.

2. The method according to claim 1, characterized in that Each wet mopping auxiliary unit further comprises foldable side wings, which are connected to the buoyancy compartment via folding joints. If severe sea conditions occur during transportation, the side wings are unfolded; otherwise, the side wings are closed.

3. The method according to claim 1, characterized in that The buoyancy chambers are arranged in multiple layers in the vertical direction. Each layer has at least two buoyancy chambers. A strip-shaped gap is formed between two adjacent buoyancy chambers in each layer. The strip-shaped gap is used to allow seawater to pass through.

4. The method according to claim 3, characterized in that The strip-shaped gaps in two adjacent layers are staggered with each other.

5. The method according to claim 2, characterized in that Each of the wet mopping auxiliary units further includes a first connecting structure and a second connecting structure, wherein the first connecting structure is arranged on both sides of the wet mopping auxiliary unit, and the second connecting structure is arranged in the middle of the wet mopping auxiliary unit; The step S1 comprises: Connecting the arc-shaped connecting member between the first connecting structures of two adjacent wet mopping auxiliary units; One end of the linear connector is connected to a limiting ring on the submersible mud-floating offshore wind turbine, and the other end is connected to the second connecting structure.

6. The method according to claim 5, characterized in that The second connection structure includes a hydraulic buffer and a universal joint connected to the hydraulic buffer, and the universal joint is connected to the linear connection member.

7. The method according to claim 6, characterized in that Each of the wet mopping auxiliary units further includes a steel structure frame, the buoyancy chamber, the side wings, the first connecting structure and the second connecting structure are all arranged on the steel structure frame, and a working bridge for workers to walk on is provided on the steel structure frame.

8. The method according to claim 7, characterized in that The steel structure frame includes a towing assembly arranged on both sides, and the towing assembly includes a tension sensor and a winch motor. The winch motor is connected to the 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.

9. The method according to claim 7, characterized in that A plurality of liftable anchors are provided at the bottom of the steel structure frame. If severe sea conditions occur during transportation, the anchors are sunk; otherwise, the anchors are kept at the bottom of the steel structure frame.

10. The method according to claim 7, characterized in that The steel structure frame includes a Z-direction limiting beam, a Y-direction limiting beam and an X-direction limiting beam which are vertically connected in sequence. The hydraulic buffer is arranged 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