Energy storage single pile suitable for deep sea wind power and construction method thereof

Abstract

The application discloses a kind of energy storage single piles suitable for deep sea wind power and its construction method, it replaces the part of soil core in the bottom of wind power single pile foundation with energy storage device, process is simple, can greatly reduce engineering cost, can also solve the heat dissipation problem of energy storage device by using the stable temperature environment of ocean underground, can also enhance the soil plug effect of single pile, increase the overall quality and movement damping of single pile, realize the promotion of vertical, horizontal bearing capacity and vibration reduction of foundation Energy consumption.

Description

Technical Field

[0001] This invention relates to offshore wind power generation devices, specifically to an energy storage monopile suitable for deep-sea wind power and its construction method. Background Technology

[0002] During the 14th Five-Year Plan period, nearshore wind power will face multiple challenges, including a decline in the scale of reserve projects, increasingly stringent ecological constraints, and increased demand for other marine resources, resulting in insufficient site resources. At the same time, my country has abundant offshore wind energy resources in its deep and distant waters, with great development potential and proximity to power load centers. Therefore, it is inevitable that offshore wind power will move from nearshore to deep and distant waters.

[0003] However, offshore wind power in deep waters still faces challenges such as high construction costs, complex sea conditions, and difficulties in construction, operation, and maintenance.

[0004] On the one hand, due to the long distance from the shore, traditional submarine cable power transmission methods are not feasible. The Tianjin University Frontier Technology Research Institute has proposed a series of patented solutions, including CN206298903U, CN206298886U, and CN206298885U, all involving the construction of offshore wind power storage platform structures to store electrical energy through energy storage batteries installed on the platform. This is a feasible solution; however, constructing separate wind power storage platform structures in deep-sea areas would be extremely costly.

[0005] On the other hand, monopile foundations for offshore wind power have advantages such as simple fabrication, convenient construction, economical cost, and simple design process, and are widely used in offshore wind power projects. In my country's coastal areas, which are mainly composed of soft clay and sand, monopile foundations account for 80% of offshore wind power applications. In nearshore deep-water areas with a depth greater than 35m, monopile foundations remain the primary support method for offshore wind turbines due to cost considerations.

[0006] In summary, the energy storage requirements of wind turbines need to be considered in the design and construction of offshore wind power in deep-sea areas, while reducing costs. Summary of the Invention

[0007] Purpose of the invention: The first purpose of this invention is to address the problems pointed out in the background art by providing a low-cost energy storage monopile suitable for deep-sea wind power; the second purpose of this invention is to provide a construction method for the energy storage monopile.

[0008] Technical solution: The first aspect of the present invention provides an energy storage monopile suitable for deep-sea wind power, including a wind power monopile foundation and an energy storage device. The energy storage device is placed in a cavity adapted to the bottom of the wind power monopile foundation, and the bottom of the cavity is the foundation of the energy storage device.

[0009] Wind turbine monopile foundations typically have diameters between 6m and 10m and burial depths between 20m and 50m, leaving significant usable space within the foundation. This invention removes a portion of the soil core from the monopile to create a space for energy storage. The process is simple and cost-effective. Inserting the monopile into the ocean floor provides a stable temperature environment, addressing the heat dissipation issue of the energy storage device. Removing part of the soil core and replacing it with a larger energy storage device not only enhances the soil plugging effect of the monopile, increasing its overall mass and motion damping, but also improves the foundation's vertical and horizontal bearing capacity and vibration damping capabilities.

[0010] Furthermore, in order to fully utilize the stable temperature environment of the ocean subsurface to dissipate heat from the energy storage device and keep the energy storage device in an optimal constant temperature environment, the top of the energy storage device should not be higher than the water depth area affected by atmospheric sunlight.

[0011] Furthermore, to ensure the stability of the foundation beneath the energy storage device without affecting the bearing capacity of the original wind turbine monopile foundation, the distance between the foundation beneath the energy storage device and the bottom of the wind turbine monopile foundation shall be at least one pile diameter.

[0012] Furthermore, the energy storage device is a circular steel container structure with an internally sealed interior and an opening at the top; the energy storage device houses the energy storage batteries and related equipment.

[0013] Furthermore, to facilitate equipment installation and maintenance, a channel is provided on the top of the energy storage device, which connects to the maintenance platform on the wind turbine monopile foundation. To reduce the impact of the dynamic response of the upper structure of the wind turbine on the energy storage device, the lower end of the channel is welded and fixed to the energy storage device, and the upper end is hinged to the maintenance platform using a flexible material with displacement buffering function.

[0014] Furthermore, to ensure the stable operation of the energy storage device, the foundation below the energy storage device is filled with crushed stone or sand, compacted and leveled, and waterproofed to a certain extent.

[0015] Furthermore, to ensure the stable operation of the energy storage device, vibration damping dampers are uniformly arranged circumferentially between the energy storage device and the inner wall of the cavity.

[0016] Furthermore, to avoid the impact of the dynamic response of a single pile on the energy storage device, the vibration damping resistance is arranged near the rotation center of the single pile foundation, either in a single layer or multiple layers above and below.

[0017] Furthermore, to increase the overall self-weight of the single pile and ensure the stable operation of the energy storage device, gravel or sand is also filled between the energy storage device and the inner wall of the cavity.

[0018] A second aspect of this invention provides a construction method for energy storage monopile suitable for deep-sea wind power, comprising the following steps:

[0019] (1) Determine the size and burial depth of the energy storage device based on the diameter of the single pile foundation, the burial depth, the water depth and the water temperature distribution;

[0020] (2) Drive single pile foundations to the designed depth at the designed location;

[0021] (3) Use a pumping method to remove the soil inside the pile and empty it to the design depth;

[0022] (4) Use crushed stone and sand to fill the inside of the pile densely, and pour waterproof concrete for leveling and waterproofing, while preventing the internal soil from bulging or seawater from flowing back in.

[0023] (5) Place an energy storage device in the internal cavity of the steel pipe pile;

[0024] (6) The space between the energy storage device and the monopile foundation shall be filled with crushed stone or sand until it reaches the vicinity of the rotation center of the monopile foundation, and the vibration damping resistance device shall be evenly arranged in the circumference; if it is a multi-layer arrangement, crushed stone or sand shall be filled in layers and the vibration damping resistance device shall be arranged in layers until the design height is reached.

[0025] (7) The installation channel is welded and fixed to the energy storage device at the lower end, and the upper end is hinged to the maintenance platform using a flexible material with displacement buffering effect.

[0026] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: using the interior of the wind turbine monopile foundation as the space for energy storage devices can greatly reduce engineering costs; in addition, it can utilize the stable temperature environment of the ocean underground to solve the heat dissipation problem of the energy storage devices, and can also enhance the soil plugging effect of the monopile, increase the overall mass and motion damping of the monopile, and improve the vertical and horizontal bearing capacity and vibration reduction energy consumption of the foundation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a storage monopile suitable for deep-sea wind power, provided in an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the energy storage device in the embodiments of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the foundation beneath the energy storage device in this embodiment of the application;

[0031] Figure 4This is a top view of the arrangement of the vibration damping drag devices in the embodiments of this application;

[0032] Attached reference numerals: 1, wind turbine monopile foundation; 11, energy storage device; 12, vibration damping device; 13, passageway; 14, maintenance platform; 15, foundation beneath the energy storage device. Detailed Implementation

[0033] 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 not all the 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 protection scope of the present invention.

[0034] Figure 1 This application provides an energy storage monopile suitable for deep-sea wind power. The monopile includes a wind turbine monopile foundation 1 and an energy storage device 11. The wind turbine monopile foundation 1 has a diameter of 8m and a burial depth of 40m. The site is covered by a thick layer of soft clay, and the seawater depth is 30m-40m. Due to the long distance from the shore, traditional submarine cable power transmission methods are not feasible. This energy storage monopile combines a monopile structure with an energy storage system, which can significantly improve the energy storage performance of offshore wind turbines at a lower cost.

[0035] The energy storage device 11 is an internally sealed circular steel container structure housing energy storage batteries and related equipment, with an opening at the top. For example... Figure 2 As shown, in this embodiment, the circular steel container structure has a designed diameter of 5.5m and a designed height of 40m. Part of the soil core is removed from the interior of the wind turbine monopile foundation 1 to form a cavity adapted to the energy storage device 11, to house the circular energy storage device 11. The bottom of the cavity serves as the lower foundation 15 for the energy storage device.

[0036] To fully utilize the stable temperature environment of the ocean subsurface for heat dissipation of the energy storage device 11 and to maintain the device in an optimal constant-temperature environment, the top of the energy storage device 11 should not exceed the water depth area affected by atmospheric radiation, etc. For example... Figure 2 As shown in this embodiment, the circular steel container structure is designed to be buried at a depth of 25m, with a height of 15m above the seabed, and its top is 15m to 25m below the sea level, which can effectively avoid the influence of the atmosphere and sunlight on the sea surface temperature.

[0037] To ensure the stability of the foundation 15 beneath the energy storage device, and without affecting the bearing capacity of the existing wind turbine monopile foundation 1, the bottom of the foundation 15 beneath the energy storage device must be at least one pile diameter above the bottom of the wind turbine monopile foundation 1. For example... Figure 3As shown, in this embodiment, the depth of the lower foundation 15 of the energy storage device is 5m, and the bottom of the lower foundation 15 of the energy storage device is 10m away from the bottom of the wind power monopile foundation 1, which is greater than one pile diameter.

[0038] To ensure the stable operation of the energy storage device 11, a vibration damping device 12 is arranged between the energy storage device and the internal cavity of the monopile foundation, and filled with gravel or sand. Specifically, to avoid the influence of the monopile's dynamic response on the energy storage device 11, the vibration damping device 12 is arranged near the rotation center of the monopile foundation, in a single layer or multiple layers evenly distributed circumferentially. Figure 3 As shown, in this embodiment, based on the single pile design data, the rotation center of the pile is determined to be located 4m above the bottom surface of the energy storage device. Therefore, two layers are arranged at positions 3m and 6m above the bottom surface of the energy storage device 11, respectively. Eight vibration damping devices 12 are evenly arranged circumferentially in each layer. Both ends of the vibration damping devices 12 are in close contact with the outer side of the energy storage device 11 and the inner wall of the cavity (steel pipe pile), respectively. Figure 4 As shown.

[0039] To ensure the stable operation of the energy storage device 11, the foundation 15 beneath the energy storage device is filled with crushed stone or sand, compacted and leveled, and waterproofed to a certain extent. In this embodiment, the foundation 15 beneath the energy storage device is constructed using underwater concrete.

[0040] To facilitate equipment installation and maintenance, a channel 13 is provided on the top of the energy storage device 11, which is connected to the maintenance platform 14 of the upper structure of the wind turbine. Specifically, to reduce the impact of the dynamic response of the upper structure of the wind turbine on the energy storage device 11, the lower end of the channel 13 is welded to the energy storage device 11, such as... Figure 2 As shown, in this embodiment, the diameter of the reserved hole at the top of the energy storage device 11 is 3m, and the outer extension is welded to the channel 13. The upper end of the channel 13 is hinged to the maintenance platform 14 using a flexible material with displacement buffering function.

[0041] In this embodiment, the internal capacity of the energy storage monopile can reach nearly 950m. 3 The energy storage space can effectively solve the problems of insufficient energy storage space and high energy storage space cost.

[0042] This application also provides a construction method for the above-mentioned energy storage monopile, including the following steps:

[0043] (1) Determine the size and burial depth of the energy storage device 11 based on the diameter of the single pile foundation, the burial depth, the water depth and the water temperature distribution;

[0044] (2) Drive single pile foundations to the designed depth at the designed location;

[0045] (3) Use a pumping method to remove the soil inside the pile and empty it to the design depth;

[0046] (4) Use crushed stone and sand to fill the inside of the pile densely, and pour waterproof concrete for leveling and waterproofing, while preventing the internal soil from bulging or seawater from flowing back in.

[0047] (5) An energy storage device 11 is placed in the internal cavity of the steel pipe pile;

[0048] (6) The space between the energy storage device 11 and the single pile foundation is filled with crushed stone or sand until it reaches the vicinity of the rotation center of the single pile foundation. Vibration damping resistance devices 12 are evenly arranged in the circumference. Since the vibration damping resistance devices 12 are arranged in multiple layers, crushed stone or sand is filled in layers and the vibration damping resistance devices 12 are arranged in layers until the design height is reached.

[0049] It should be noted that in steps (5) and (6), the inside of the steel pipe needs to be dewatered to ensure the safety of the pile construction.

[0050] (7) Install the channel 13, with the lower end welded to the energy storage device 11 and the upper end hinged to the maintenance platform 14 using a flexible material with displacement buffering effect.

[0051] It is worth noting that since the energy storage device 11 is a closed space with a channel only at the top, there is no need to dewater the inside of the monopile during normal operation of the wind turbine.

[0052] This invention involves modifying and installing an energy storage device inside a monopile, utilizing the stable temperature environment of the ocean subsurface to dissipate heat from the energy storage device; and enhancing the soil plugging effect of the monopile by utilizing the mass of the internal energy storage device, thereby increasing the mass and damping of the monopile, and further improving the vertical and horizontal bearing capacity and vibration reduction energy dissipation effect of the foundation without weakening the original bearing capacity of the monopile.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A monopile for energy storage suitable for deep-sea wind power, characterized in that, It includes a wind turbine monopile foundation (1) and an energy storage device (11). The energy storage device (11) is placed in a cavity adapted to the bottom of the wind turbine monopile foundation (1). The bottom of the cavity is the foundation (15) of the energy storage device. The cavity is formed by removing part of the soil core inside the wind turbine monopile foundation (1). The top of the energy storage device (11) is not higher than the water depth area affected by atmospheric light.

2. The energy storage monopile according to claim 1, characterized in that, The distance between the foundation (15) of the energy storage device and the bottom of the wind turbine monopile foundation (1) is at least one pile diameter.

3. The energy storage monopile according to claim 1, characterized in that, The energy storage device (11) is a circular steel container structure with an internal seal and an opening at the top; the energy storage device (11) contains energy storage batteries and related equipment.

4. The energy storage monopile according to claim 1, characterized in that, The energy storage device (11) has a channel (13) on top. The lower end of the channel (13) is welded and fixed to the energy storage device (11), and the upper end is hinged to the maintenance platform (14) using a flexible material with displacement buffering function.

5. The energy storage monopile according to claim 1, characterized in that, The foundation (15) of the energy storage device is filled with crushed stone or sand, and is compacted and leveled, and is waterproofed to a certain extent.

6. The energy storage monopile according to any one of claims 1 to 5, characterized in that, Vibration damping dampers (12) are uniformly arranged circumferentially between the energy storage device (11) and the inner wall of the cavity.

7. The energy storage monopile according to claim 6, characterized in that, Vibration damping resistors (12) are arranged near the rotation center of the single pile foundation, either in a single layer or multiple layers above and below.

8. The energy storage monopile according to claim 6, characterized in that, The space between the energy storage device (11) and the inner wall of the cavity is also filled with gravel or sand.

9. A construction method for energy storage monopile suitable for deep-sea wind power, characterized in that, Includes the following steps: (1) Determine the size and burial depth of the energy storage device (11) based on the diameter of the single pile foundation, the burial depth, the water depth and the water temperature distribution; (2) Drive single pile foundations to the designed depth at the designed location; (3) Use a pump suction method to remove the soil inside the pile and empty it to the design depth; (4) Use crushed stone and sand to fill the inside of the pile and fill it with waterproof concrete for leveling and waterproofing, while preventing the soil inside from bulging or seawater from flowing back in. (5) An energy storage device (11) is placed inside the cavity of the steel pipe pile; (6) The space between the energy storage device (11) and the single pile foundation is filled with crushed stone or sand until it reaches the vicinity of the rotation center of the single pile foundation. Vibration damping devices (12) are evenly arranged in the circumference. If it is a multi-layer arrangement, crushed stone or sand is filled in layers and vibration damping devices (12) are arranged in layers until the design height is reached. (7) The lower end of the installation channel (13) is welded and fixed to the energy storage device (11), and the upper end is hinged to the maintenance platform (14) using a flexible material with displacement buffering effect.

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