WO2022151740A1 - Offshore wind turbine foundation, construction method therefor, ice-resistant device and wind power generation set - Google Patents

Abstract

An ice-resistant device for an offshore wind turbine foundation, an offshore wind turbine foundation having the ice-resistant device, a construction method therefor and a wind power generation set using the offshore wind turbine foundation having the ice-resistant device. The ice-resistant device comprises a shell plate (41), toggle plates (42), watertight partition plates (43), an upper ring beam (46) and a lower ring beam (47), wherein the upper ring beam (46) and the lower ring beam (47) are respectively connected to the two ends of the toggle plates (42), the toggle plates (42) are evenly arranged in the circumferential direction of the upper ring beam (46) and the lower ring beam (47), the watertight partition plate (43) is arranged in the middle of the toggle plate (42), the width of the toggle plate (42) is gradually reduced from the center to the two ends, the shell plate (41) is vertically symmetrical with regard to the watertight partition plates (43), the shell plate (41) is connected to the toggle plates (42), the upper ring beam (46) and the lower ring beam (47), the intersection line of the toggle plates (42) and the shell plate (41) is a super-elliptic curve, and the shell plate (41) is curved, so that an impact force of floating ice can be more effectively decomposed into a supporting force perpendicular to the shell plate, and the failure mode of the floating ice changes from compressive failure to bending failure.

Description

Offshore wind turbine foundation and its construction method, anti-icing device and wind turbine

This application requires the priority of the Chinese patent application filed on January 18, 2021, with the application number of 202110063448.8 and the invention titled "Offshore Wind Turbine Foundation and its Construction Method, Anti-icing Device and Wind Turbine Set", all of which The contents are incorporated herein by reference.

technical field

The invention belongs to the technical field of operation and maintenance of offshore wind turbines, and in particular relates to an offshore wind turbine foundation and a construction method thereof, an anti-icing device and a wind turbine.

Background technique

With the requirements of energy transformation, wind power has become one of the fastest growing energy sources in green energy due to its technological maturity and low cost per kilowatt-hour. As offshore wind power is close to the power consumption center and does not need to occupy land area, its development in recent years has been supported by all sectors of society.

In the construction of offshore wind farms, in the sea areas of coastal provinces such as Liaoning, Hebei, and Tianjin, it is necessary to consider the impact of sea ice on the infrastructure due to climate reasons. Due to the large impact force of sea ice and various action modes of ice load, the limit and fatigue of the supporting structure of offshore wind turbines may be greatly affected. Therefore, when designing the wind turbine foundation in the sea area with sea ice, it is necessary to design such that the sea ice is damaged before the structure. At present, the design method of the anti-icing device for large-scale steel structure buildings in the sea area of heavy ice area is to install anti-icing cones on the tidal section of the foundation column. When the floating ice acts on the slope of the cone, the failure mode of the floating ice is caused by extrusion damage Converts to flexural failure, so the anti-icing pick helps reduce the impact load of the ice floes.

However, the current anti-icing cone design greatly increases the water plane, which increases the ultimate load and fatigue load of waves in the absence of ice floes, resulting in a larger amount of engineering for the foundation column to resist the wave load; and , the curvature of the slope of the existing anti-icing cone design is unchanged, and the impact force of the floating ice cannot be reduced most efficiently, and the failure mode of the floating ice of different thicknesses cannot be guaranteed to be bending failure.

SUMMARY OF THE INVENTION

In order to solve the problems existing in the prior art, the present invention provides a basic anti-icing device for offshore wind turbines, which can not only reduce the wave load by reducing the water plane, but also reduce the floating ice by changing the curvature of the anti-ice cone shell. The impact force, and make the ice floes more prone to bending damage, and ultimately play a role in reducing the ice load.

In order to achieve the above purpose, the technical scheme adopted in the present invention is: an anti-icing device for the foundation of an offshore wind turbine, comprising a shell plate, a bracket, a watertight partition, an upper ring beam and a lower ring beam, and the upper ring beam and the lower ring beam are respectively connected with The two ends of the bracket are connected, the bracket is evenly arranged along the circumference of the upper ring beam and the lower ring beam, the watertight partition is arranged in the middle of the bracket, the width of the bracket gradually decreases from the center to the two ends, and the shell plate is about the watertight partition. The plate is symmetrical up and down, the shell plate is connected with the bracket, the upper ring beam and the lower ring beam, and the shell plate is a curved surface.

The intersection line of bracket and shell plate is a hyperelliptic curve, which satisfies the following formula: (x/a) ^m + (y/b) ⁿ = 1, m = n, the value range of m and n are both [1.50, 2.20 ]; x and y represent the coordinate values of any point on the contour line on the major axis and the minor axis of the local coordinate system hyperellipse, respectively.

m=n=2, and a=b, the outer contour line of the shell plate is a standard circle.

There are weight reduction holes on the toggle plate.

Anti-corrosion layers are provided on the shell plates, brackets, watertight diaphragms, upper ring beams and lower ring beams.

An offshore wind turbine foundation, comprising a cylindrical foundation and an anti-icing device, the anti-icing device is arranged on the outer side of the cylindrical foundation, the cavity between the outer side of the cylindrical foundation and the anti-icing device is filled with cement slurry, and the anti-icing device adopts the right The basic anti-icing device for offshore wind turbines according to any one of requirements 1-5.

Connecting steel bars are arranged between the anti-icing device and the cylindrical foundation.

The anti-icing device is connected with the cylindrical foundation through the upper ring beam and the lower ring beam, and the height of the anti-icing device is adjustable.

The construction method of the offshore wind turbine foundation according to the present invention comprises the following steps:

The anti-icing device components are installed outside the cylindrical foundation on the shore, and the anti-icing device components are clamped on the upper ring beam and the lower ring beam;

Piling and piling of foundations during offshore operations;

The cavity between the tubular foundation and the anti-icing device is grouted during offshore operations, so that the tubular foundation and the anti-icing device are fixed.

A wind power generator set adopts the offshore wind turbine foundation of the present invention.

Compared with the prior art, the present invention at least has the following beneficial effects:

The curved shell plate decomposes the ice floe into a force perpendicular to the shell plate and a force parallel to the shell plate by the impact force. The parallel force with the shell plate gradually decreases, causing bending damage to the sea ice, which can minimize the strength of the sea ice, thereby reducing the impact force of the sea ice; The surface is smaller, which can better reduce the effect of wave loads; the structure is simple, easy to construct, requires little construction equipment, and low construction costs.

Further, the shape of the rib is optimized, and the shape of the rib with variable curvature can reduce the SCF value, reduce the impact force of sea ice, and be more conducive to bending failure.

Description of drawings

The above and other features and advantages of the present invention will become more apparent from the following detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, in which:

Figure 1 is a schematic diagram of the structure of an offshore wind turbine.

Figure 2 is a structural diagram of an implementable base anti-icing device for offshore wind turbines.

Figure 3 is a front view of an implementable base anti-icing device for offshore wind turbines.

Figure 4 is a diagram of an implementable bracket of an offshore wind turbine foundation anti-icing device.

Figure 5 is a schematic diagram of the force of the foundation anti-icing device of a traditional offshore wind turbine.

Fig. 6 is a schematic diagram of the force of an implementable base anti-icing device for offshore wind turbines.

In the drawings, 1-fan unit, 2-tower, 3-tubular foundation, 4-anti-icing device, 41-shell plate, 42-bracket, 43-watertight partition plate, 44-weight reduction hole, 46- Upper ring beam, 47 - lower ring beam.

Detailed ways

The invention/invention is described in detail below with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

1 and 2, the anti-icing device is arranged around the base cylinder, and the anti-icing device includes a plurality of anti-icing members: including a shell plate 41, a bracket 42, a watertight partition 43, an upper ring beam 46 and a lower The ring beam 47, the upper ring beam 46 and the lower ring beam 47 are respectively connected with both ends of the bracket 42, the bracket 42 is evenly arranged along the circumferential direction of the upper ring beam 46 and the lower ring beam 47, and the watertight partition plate 43 is arranged on the bracket 42 In the middle part, the width of the bracket 42 gradually decreases from the center to the two ends, the shell plate 41 is symmetrical about the watertight partition 43, the shell plate 41 is connected with the bracket plate 42, the upper ring beam 46 and the lower ring beam 47, and the shell plate 41 For a curved surface, the anti-icing device is installed on the cylindrical foundation 3 below the fan unit 1 and the tower 2 .

The shell plates 41 are connected by the bracket plate 42 and the watertight partition plate 43, and the bracket plate 42 and the watertight partition plate 43 can enhance the overall rigidity and strength of the anti-icing device.

The watertight baffles 43 between the upper and lower shell plates 41 can also prevent seawater from entering the interior of the anti-icing cone and resist the ice cone from causing corrosion or frost heave damage.

The upper ring beam 46 and the lower ring beam 47 are directly welded on the cylindrical foundation 3, and the anti-icing device 4 can be directly installed and fixed on the ring beam.

In the structure of the anti-icing device, the upper and lower brackets 42 are symmetrical. In the front view of the anti-icing device, the intersection line between the bracket and the shell plate is described by a hyperelliptic curve, as shown in Figure 4, the anti-icing cone. The profile curve of the front view of the rib satisfies the following formula:

(x/a) ^m + (y/b) ⁿ = 1

Wherein, x and y respectively represent the coordinate values of any point on the contour line on the long axis of the x-axis and the short axis of the y-axis of the local coordinate system, and a represents the width of the outer contour line of the top view of the shell plate 41 on the X axis 1/2 value of , and b represents the height value of the outer contour line of the top view of the shell plate 41 on the Y-axis. In the formula that the shape of the front view of the anti-icing rib satisfies, m=n and both satisfy the interval of [1.5, 2.2].

The hyperellipse function formula is a new shape function formula based on the ellipse function. It can draw a family of curves including ellipse through two variables m and n. The curve drawn according to the hyperelliptic function formula is called a hyperelliptic curve. When m=n=2, the hyperelliptic curve degenerates into an elliptic curve; when m=n=1, the hyperelliptic curve degenerates into a straight line. Due to the introduction of variables m and n, the scope of the design domain becomes larger. Therefore, in the process of shape optimization, the purpose of reducing the SCF value is achieved by setting the appropriate m and n values.

If m and n are outside the interval of [1.50, 2.20], the above effects cannot be achieved. Specifically, when m and n are less than 1.0, the shape of the anti-icing device tends to be a convex ellipse, which cannot make The effect of the ice floe bending damage, and will increase the water plane, resulting in excessive fatigue load in the non-ice period; when m and n are greater than 2.5, the shape and curvature of the anti-ice cone will not change smoothly, which will lead to local ice floes. The impact is too large, resulting in the ultimate destruction of the anti-icing device.

As shown in Fig. 5, when the traditional anti-icing scheme is adopted, that is, when m=n=1, the curvature of the rib is constant, and the angle between the entire rib and the base cylinder is α ₁ . When impacted with impact force F, the anti-icing pick decomposes F into F ₁ =F·cosα ₁ perpendicular to the shell plate and F ₂ =F·sinα ₁ parallel to the shell plate.

Referring to Fig. 3 and Fig. 6, when the super-ellipse anti-icing cone scheme is adopted, such as when m=n=2, the curvature of the rib is not a fixed value, and the angle between the entire rib and the base cylinder is α ₂ , when When the ice floe hits with the impact force F, the anti-icing cone decomposes F into F ₁ '=F·cosα ₂ perpendicular to the shell plate and F ₂ '=F·sinα ₂ parallel to the shell plate. With the increase of the contact degree between the floating ice and the anti-ice cone, α ₂ has been decreasing from 90°, F ₁ ' has been increasing, and F ₂ ' has been decreasing. As F ₁ ' increases, the ice floes will be damaged by bending modes.

An anti-corrosion layer is provided on the shell plate 41 , the bracket plate 42 , the watertight partition plate 43 , the upper ring beam 46 and the lower ring beam 47 .

The bracket 42 is symmetrical up and down with respect to the watertight partition 43. In the front view of the anti-icing device, the intersection line between the bracket and the shell plate is described by a hyperelliptic curve. As shown in Figure 4, the shape curve of the front view of the anti-icing cone satisfies The following formula:

(x/a) ^m + (y/b) ⁿ = 1

Wherein, x and y respectively represent the coordinate values of any point on the contour line on the x-axis (long axis) and y-axis (short axis) of the local coordinate system, and a represents the outer contour line of the top view of the shell plate 41 at X 1/2 value of the width on the axis, b represents the height value of the outer contour line in the top view of the shell plate 41 on the Y axis, in the formula satisfied by the shell plate 41, m=n=1.9.

For the offshore wind turbine foundation using the anti-icing device of the present invention, the anti-icing device 4 is arranged on the outer side of the foundation structure, and the cavity between the outer surface of the foundation and the anti-icing device is filled with cement slurry.

Connecting steel bars are arranged between the anti-icing device and the foundation.

As an optional real-time method, the upper ring beam 46 and the lower ring beam 47 are spiral; if the tidal difference is large, the elevation of the anti-icing device 4 can be adjusted later.

Multiple sets of upper ring beams 46 and lower ring beams 47 may also be arranged on the outer side wall of the offshore wind turbine foundation to change the height of the anti-icing device 4 .

A plurality of pre-embedded connection columns are arranged on the outside of the offshore wind turbine foundation. The pre-embedded connection columns are used to connect the upper ring beam 46 and the lower ring beam 47, and the anti-icing device 4 is changed by changing the positions of the upper ring beam 46 and the lower ring beam 47. the height of.

The construction and installation method of the anti-icing cone of the offshore wind power foundation according to the present invention comprises the following steps:

1) On the shore, install the anti-icing device components on the outside of the cylindrical foundation and clamp them on the upper and lower ring beams

2) Piling and piling of cylindrical foundations during offshore operations

3) Grouting the cavity between the cylindrical foundation and the anti-icing device during offshore operations to fix the cylindrical foundation and the anti-icing device.

An offshore wind power generator set adopts a cylindrical foundation 3 on which the anti-icing device for the offshore wind turbine foundation according to the present invention is arranged.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. Under the inspiration of the present invention, without departing from the spirit of the present invention and the protection scope of the claims, personnel can also make many forms, which all fall within the protection scope of the claims of the present invention.

Claims (10)

1. An anti-icing device for an offshore wind turbine foundation, characterized in that it comprises a shell plate (41), a bracket plate (42), a watertight partition plate (43), an upper ring beam (46), a lower ring beam (47), and the upper ring beam (47). (46) and the lower ring beam (47) are respectively connected with both ends of the bracket (42), the bracket (42) is evenly arranged along the circumference of the upper ring beam (46) and the lower ring beam (47), and the watertight partition (42) 43) Set in the middle of the bracket (42), the width of the bracket (42) gradually decreases from the center to the two ends, the shell plate (41) is symmetrical about the watertight partition (43), the shell plate (41) and the bracket The plate (42), the upper ring beam (46) and the lower ring beam (47) are connected, and the shell plate (41) is a curved surface.
2. The basic anti-icing device for offshore wind turbines according to claim 1, wherein the intersection line of the bracket (42) and the shell plate (41) is a hyperelliptic curve, which satisfies the following formula: (x/a) ^m + (y /b) ⁿ = 1, m = n, the value range of m and n are both [1.50, 2.20]; x and y represent any point on the contour line in the local coordinate system hyperellipse major axis and minor axis respectively the coordinate values on the .
3. The basic anti-icing device for offshore wind turbines according to claim 2, characterized in that, m=n=2, and a=b, and the outer contour line of the shell plate (41) is a standard circle.
4. The basic anti-icing device for offshore wind turbines according to claim 1, characterized in that a weight reduction hole (44) is provided on the bracket (42).
5. The anti-icing device for offshore wind turbine foundation according to claim 1, characterized in that the shell plate (41), the bracket plate (42), the watertight partition plate (43), the upper ring beam (46) and the lower ring beam (47) Anti-corrosion layer is installed on it.
6. An offshore wind turbine foundation, characterized in that it comprises a cylindrical foundation (3) and an anti-icing device (4), wherein the anti-icing device (4) is arranged on the outside of the cylindrical foundation (3), and the outside of the cylindrical foundation (3) The cavity between the side surface and the anti-icing device is filled with cement slurry, and the anti-icing device (4) adopts the basic anti-icing device for offshore wind turbines according to any one of claims 1-5.
7. The foundation of an offshore wind turbine according to claim 6, characterized in that connecting steel bars are arranged between the anti-icing device (4) and the cylindrical foundation (3).
8. The offshore wind turbine foundation according to claim 6, characterized in that the anti-icing device (4) is connected to the cylindrical foundation (3) through the upper ring beam (46) and the lower ring beam (47), and the anti-icing device (4) ) is height adjustable.
9. The construction method of offshore wind turbine foundation described in claim 6, is characterized in that, comprises the following steps:

   The anti-icing device components are installed on the outside of the cylindrical foundation (3) on the shore, and the anti-icing device components are clamped on the upper ring beam (46) and the lower ring beam (47);

   Piling and piling of foundations during offshore operations;

   During offshore operations, the cavity between the cylindrical foundation and the anti-icing device is grouted, so that the cylindrical foundation (3) and the anti-icing device (4) are fixed.
10. A wind turbine generator set is characterized in that the offshore wind turbine foundation described in any one of claims 6-8 is adopted.

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