CN112127384A - Suspended Ballast Offshore Wind Turbine Floating Infrastructure - Google Patents

Abstract

The invention discloses a floating foundation structure of a suspended pressure-loaded offshore wind turbine, which comprises a wind turbine, a floating support foundation and a mooring cable, wherein the floating support foundation comprises a connecting steel bracket, a buoy, a suspended chain rope and a suspended ballast structure, the upper floating body and the lower suspended ballast structure are connected together by the suspended chain rope, intermediate steel is saved, steel consumption is saved, and cost is reduced. The inclined strut steel support and the central steel support are arranged at a certain angle, so that bending moment on the central steel support is converted into tension pressure on the inclined strut steel support, the stress is more reasonable, and two included angles between planes formed by the axes of the inclined strut steel support and the radial steel support are 120 degrees. The mooring cable and the suspension chain rope are fixed on the radial steel support, only static water restoring force/moment load is transferred between the buoy and the radial steel support, the stress is more reasonable, and the stress damage between the buoy and the radial steel support is effectively relieved.

Description

Suspended Ballast Offshore Wind Turbine Floating Infrastructure

technical field

The invention relates to the technical field of offshore wind power generation, in particular to a floating foundation structure of a suspended ballast type offshore fan.

Background technique

At present, offshore wind power projects mainly focus on the development of offshore wind power resources. With the technological development of offshore wind power, advancing to the deep sea is an inevitable trend of development. At present, the foundations used in offshore areas are mainly fixed support foundations, but they have strict requirements on water depth. With the increase of water depth, the dead weight and engineering cost of traditional fixed foundations will increase significantly, and the cost of fixed foundation structures in deep sea areas is much higher than that of floating foundation structures. The floating foundation breaks through the limitation of water depth, and the construction cost is not sensitive to the increase of water depth. In addition, floating wind power can free wind turbines from the constraints of different seabed conditions, standardize the design of foundations, and minimize offshore operations; unlike traditional offshore wind turbines, where the foundation is fixed on the seabed, floating foundations When repairing or avoiding a typhoon, the fixed anchor cable can be easily released to return to the port, with good maneuverability, reuse and repeated deployment; compared with traditional seabed fixed offshore wind turbines, floating offshore wind turbines can be contacted Strong winds to the depths of the ocean, so the utilization rate of wind energy is greatly improved. In summary, floating foundations are expected to become the main type of foundation for the next generation of offshore wind power.

The design concept of floating foundation for offshore wind power is mainly inherited from offshore oil platforms. Single-column type, semi-submersible type and tension leg type, as the main types widely used in offshore oil platforms, are also used by offshore wind power floating foundations. However, the biggest difference between the two is that the profit of oil is much higher than that of wind power. The floating foundation directly applied to the oil platform is used for offshore wind power, which often results in the use of too much steel for the foundation and the cost is too high. one of the limiting factors.

At present, the development of floating offshore wind power in the world is flourishing. Many projects have completed the theoretical analysis and model test stage, entered the stage of small-scale prototype operation, and some have even entered the stage of commercial projects. However, my country has not yet begun to build floating offshore wind power facilities. Therefore, in order to fully exploit the vast marine wind energy resources in my country's seas and build floating offshore wind power facilities suitable for deep-sea waters, it is necessary to propose a new type of floating infrastructure system for offshore wind turbines that is both economical and safe.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention proposes a floating base structure of a suspended ballast type offshore fan, which has the advantages of high stability, low steel consumption, low cost, strong anti-overturning ability, reasonable structural force, and floating state adjustment margin. The advantages of large and heaving motion performance are excellent.

The technical scheme adopted in the present invention is: a floating base structure of a suspended ballast type offshore fan, including a wind turbine, a floating support foundation and a mooring cable, and is characterized in that: the floating support base comprises a connecting steel bracket, a buoy , Suspension chain rope and suspension ballast structure, the upper part of the suspension chain rope is connected with the connecting steel bracket, the lower part is connected with the suspension ballast structure, and the upper steel bracket and the lower suspension ballast structure are connected into a whole; the mooring line The upper part is connected with the connecting steel bracket, and the lower part is connected with the seabed, which plays the role of positioning and providing stability to the floating system; the buoys are evenly distributed on the connecting steel bracket.

Preferably, the connecting steel bracket includes a central steel bracket, a diagonal bracing steel bracket and a radial steel bracket, and the central steel bracket, the diagonal bracing steel bracket and the radial steel bracket are connected as a whole; the central steel bracket is vertical The top is connected to the bottom of the fan tower; the radial steel brackets are arranged vertically with the central steel bracket along the radial direction of the central steel bracket, and the angle between the radial steel brackets is 120 degrees; the diagonal bracing steel brackets It is arranged at a certain angle with the central steel bracket, so that the bending moment on the central steel bracket is converted into the tensile force on the diagonal bracing steel bracket.

Preferably, the radial steel support directly passes through the buoy, and is anchored by pouring concrete with bolts and circumferential steel bars; the mooring cable and the suspension chain rope are fixed on the radial steel support, and the Only hydrostatic restoring force/moment loads are transmitted between supports.

Preferably, the buoy is a hollow subdivision structure, and the buoy is divided into a plurality of independent compartments by the vertical subdivision plate of the buoy and the transverse subdivision plate of the buoy.

Preferably, the penetration position of the radial steel bracket is located at the upper part of the buoy, when the water is still, most of the volume of the buoy is immersed in the water, and the still water surface is located at the upper part of the buoy.

Preferably, the suspended ballast structure is a hollow subdivision structure, which is divided into a plurality of independent compartments by the vertical subdivision board of the suspended ballast structure and the horizontal subdivision board of the suspended ballast structure, and the suspended ballast structure itself does not have The ability to levitate or float, i.e. gravity is also greater than buoyancy without filling in any ballast water.

Preferably, the suspended ballast structure is designed as a flat cylinder.

Preferably, the suspension chains and mooring lines are made of one material, and the suspension chains and mooring lines are anchor chains or composite materials.

The beneficial effects obtained by the present invention are:

(1) Change the traditional single rigid body floating foundation design to a double rigid body type in which the upper floating body and the lower suspended ballast structure are connected by suspension chains. It can improve the center of buoyancy and reduce the center of gravity while saving the amount of steel in the middle structure, which greatly reduces the cost;

(2) The buoy adopts an integral type and has a larger waterline surface area, which can obtain greater heave restoring force and increase the anti-overturning ability. The cost of using reinforced concrete materials is lower than that of pure steel structures, and the middle of the buoy is hollow. The floating state of the floating system can be adjusted by adjusting the amount of ballast water in the independent compartment, and leakage can be effectively prevented;

(3) The radial steel support goes directly through the buoy, the mooring line is fixed on the radial steel support, the suspension chain is also fixed on the radial steel support, and only the hydrostatic restoring force/moment is transmitted between the buoy and the radial steel support The load and the force are more reasonable, and the stress damage between the buoy and the steel bracket is effectively relieved;

(4) The penetration position of the radial steel bracket is located at the upper part of the buoy, and most of the volume of the buoy is immersed in the water in still water. This design can make the buoy as much as possible to provide greater buoyancy, thereby saving materials and costs;

(5) The suspended ballast structure is a hollow subdivision structure, which can adjust the floating state of the floating system by adjusting the ballast water volume of the independent compartment, and effectively prevent leakage;

(6) The suspended ballast structure is designed as a flat cylinder, which increases the heave damping, reduces the heave motion of the floating body, and reduces the acceleration of the fan engine room, making it easier to meet the design requirements and reduce the mooring burden at the same time;

(7) The cost of using reinforced concrete materials for suspended ballast structures is lower than that of pure steel structures.

Description of drawings

Figure 1 is a schematic diagram of a suspended ballast offshore fan floating system and its still water surface;

Figure 2 is a schematic diagram of a floating system of suspended ballast offshore wind turbines;

Figure 3 is a schematic diagram of a floating support infrastructure;

Figure 4 is a schematic diagram of the structure of the connecting steel bracket;

Figure 5-6 is a schematic diagram of the structure of the buoy;

Figure 7-8 is a schematic diagram of the suspended ballast structure;

Reference signs: wind turbine W, impeller W.1, nacelle W.2, tower W.3, floating support foundation F, upper steel support F.1, central steel support F.11, diagonal support steel support F. 12. Radial steel support F.13, buoy F.2, buoy vertical subdivision plate F.21, buoy horizontal subdivision plate F.22, suspension chain rope F.3, suspension ballast structure F.4, suspension Ballast structure vertical subdivision plate F.41, suspended ballast structure transverse subdivision plate F.42, mooring cable M.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in the drawings and the drawings, a floating foundation structure of a suspended ballast type offshore wind turbine of the present invention includes a wind turbine W, a floating support foundation F and a mooring cable M. The still water surface S is located above the pontoon F.2. The wind turbine W is composed of an impeller W.1, a nacelle W.2, a tower W.3, and the like.

As shown in the figure, the floating support foundation F consists of connecting steel supports F.1, three pontoons F.2, suspension chains F.3 and suspension ballast structures F.4.

The upper part of the suspension chain rope F.3 is connected with the radial steel bracket F.13, and the lower part is connected with the suspension ballast structure F.4, which connects the upper steel bracket F.1 and the lower suspension ballast structure F.4 into a whole. The upper part of the mooring line M is connected with the radial steel support F.13, and the lower part is connected with the seabed, which plays the role of positioning and providing stability to the floating system. The suspension chain F.3 and the mooring line M can be made of one material, for example. The suspension chains F.3 and the mooring lines M can be, for example, anchor chains or composite materials.

As shown in the figure, the connecting steel bracket F.1 includes the central steel bracket F.11, the bracing steel bracket F.12 and the radial steel bracket F.13. The central steel bracket F.11, the diagonal bracing steel bracket F.12 and the radial steel bracket F.13 are connected as a whole. The central steel bracket F.11 is arranged vertically, and the top of the central steel bracket F.11 is connected to the bottom of the fan tower W.3; the radial steel bracket F.13 is connected to the central steel bracket F. along the radial direction of the central steel bracket F.11. 11 Vertically arranged, the angle between the radial steel brackets F.13 is 120 degrees; the diagonal bracing steel brackets F.12 and the central steel bracket F.11 are arranged at a certain angle, so that the bending on the central steel bracket F.11 is The moment is converted into the tensile pressure on the diagonal bracing steel bracket F.12, and the force is more reasonable; between the plane formed by the axes of the diagonal bracing steel bracket F.12 and the radial steel bracket F.13, the angle between the two is 120 Spend.

Radial steel brackets F.13 pass directly through the pontoon F.2 and are anchored by pouring concrete with studs and hoop reinforcement. The mooring line M is fixed on the radial steel bracket F.13, the suspension chain F.3 is also fixed on the radial steel bracket F.13, and only still water is transmitted between the buoy F.2 and the radial steel bracket F.13 Restoring force/moment load, the force is more reasonable, and the stress damage between the buoy F.2 and the radial steel bracket F.13 is effectively relieved.

As shown in the figure, the pontoon F.2 is a hollow subdivision structure. The pontoon F.2 is divided into a plurality of independent compartments by the pontoon vertical subdivision plate F.21 and the pontoon transverse subdivision plate F.22. The floating state of the floating system is adjusted by adjusting the amount of ballast water in the independent compartment. The pontoon F.2 can be made of concrete material, for example, with steel bars arranged inside to ensure structural strength, and the cost is lower than that of conventional steel structures.

The penetration position of the radial steel bracket F.13 is located at the upper part of the buoy F.2. As shown in the figure, most of the volume of the buoy F.2 is immersed in the water when the water is still. Compared with the aforementioned design in which the penetration position is located in the middle of the buoy, the design in the present invention can make the buoy F.2 provide greater buoyancy as much as possible, thereby saving materials and costs.

As shown in the figure, the suspended ballast structure F.4 is a hollow subdivision structure. The suspended ballast structure F.4 is divided into multiple independent compartments by the suspended ballast structure vertical subdivision plate F.41 and the suspended ballast structure transverse subdivision plate F.42. The floating state of the floating system is adjusted by adjusting the amount of ballast water in the independent compartment. The suspended ballast structure F.4 itself does not have the ability to suspend or float, that is, the gravity is greater than the buoyancy without any ballast water being poured into it. The suspended ballast structure F.4 can be, for example, a concrete material, and steel bars are arranged inside to ensure structural strength, and the cost is lower than that of conventional steel structures. For example, the suspended ballast structure F.4 can be a flat cylinder design, which increases the heave damping, reduces the heave motion of the floating body, and reduces the acceleration of the fan engine room, making it easier to meet the design requirements and at the same time reduce the mooring burden.

The invention provides a floating base structure of a suspended ballast type offshore fan, which has the advantages of high stability, low steel consumption, low cost, strong anti-overturning ability, reasonable structural force, large floating state adjustment margin, and heave motion. The advantage of excellent performance is a new type of floating infrastructure system for offshore wind turbines that combines economy and safety.

The above descriptions are only preferred embodiments of the present invention, but the present invention is not limited to the specific embodiments described above. On the premise of not departing from the principles of the present invention, those of ordinary skill in the art can also make some modifications, supplements or use similar methods instead, which should also be regarded as the protection scope of the present invention.

Although the present invention uses more: wind turbine W, impeller W.1, nacelle W.2, tower W.3, floating support foundation F, upper steel support F.1, central steel support F.11, inclined Brace steel bracket F.12, radial steel bracket F.13, buoy F.2, buoy vertical subdivision plate F.21, buoy horizontal subdivision plate F.22, suspension chain rope F.3, suspension ballast structure F.4, vertical subdivision plate of suspended ballast structure F.41, horizontal subdivision plate of suspended ballast structure F.42, mooring line M and other terms, but the possibility of using other terms cannot be excluded. These terms are only used to more conveniently describe and explain the essence of the present invention, and it is contrary to the spirit of the present invention to interpret them as any kind of additional limitation.

Claims (6)

1. A suspended ballast type offshore fan floating base structure, comprising a wind turbine (W), a floating support foundation (F) and a mooring cable (M), characterized in that: the floating support base (F) Including connecting steel bracket (F.1), buoy (F.2), suspension chain rope (F.3) and suspension ballast structure (F.4), the upper part of the suspension chain rope (F.3) is connected with the connecting steel The bracket (F.1) is connected, the lower part is connected with the suspended ballast structure (F.4), and the upper steel bracket (F.1) and the lower suspended ballast structure (F.4) are connected into a whole; the mooring The upper part of the cable (M) is connected with the connecting steel bracket (F.1), and the lower part is connected with the seabed; the buoys (F.2) are evenly distributed on the connecting steel bracket (F.1); The connecting steel bracket (F.1) includes a central steel bracket (F.11), a bracing steel bracket (F.12) and a radial steel bracket (F.13). The central steel bracket (F.11) , the diagonal bracing steel bracket (F.12) and the radial steel bracket (F.13) are connected as a whole; the central steel bracket (F.11) is arranged vertically, and the top is connected to the fan tower of the wind turbine (W). (W.3) Bottom connection; the radial steel bracket (F.13) is arranged perpendicular to the central steel bracket (F.11) along the radial direction of the central steel bracket (F.11), and the radial steel bracket (F.11) F.13) The included angle between each pair is 120 degrees; the diagonal bracing steel bracket (F.12) and the central steel bracket (F.11) are arranged at a certain angle, so that the central steel bracket (F.11) The bending moment on is converted into the tensile pressure on the diagonal bracing steel bracket (F.12); The buoy (F.2) is a hollow subdivision structure, and the buoy (F.2) is divided into a plurality of independent buoys by the buoy vertical subdivision plate (F.21) and the buoy transverse subdivision plate (F.22). cabin; The suspended ballast structure (F.4) is a hollow subdivision structure, and the suspended ballast structure (F.4) is divided by the suspended ballast structure vertical subdivision plate (F.41) and the suspended ballast structure horizontally. The deck (F.42) is divided into a number of independent compartments, the suspended ballast structure (F.4) itself does not have the ability to suspend or float, that is, the gravity is greater than the buoyancy without filling any ballast water . 2. The floating foundation structure for suspended ballast type offshore wind turbines according to claim 1, characterized in that: the radial steel bracket (F.13) directly passes through the buoy (F.2), using pegs and rings Pour concrete to the reinforcement for anchoring. 3. The floating base structure for suspended ballast type offshore wind turbines according to claim 2, characterized in that: the penetration position of the radial steel support (F.13) is located at the upper part of the buoy (F.2), and the still water surface is located at the upper part of the buoy (F.2). The upper part of the buoy (F.2). 4. The floating foundation structure of suspended ballast type offshore wind turbine according to claim 1, characterized in that: the mooring cable (M) and the suspension chain rope (F.3) are fixed on the radial steel bracket (F.3). 13), only the hydrostatic restoring force/moment load is transmitted between the buoy (F.2) and the radial steel support (F.13). 5. The floating foundation structure of the suspended ballast type offshore wind turbine according to claim 1, characterized in that: the suspended ballast structure (F.4) is a flat cylinder. 6. The floating foundation structure of suspended ballast type offshore wind turbine according to claim 1, characterized in that: the mooring line (M) and the suspension chain rope (F.3) are made of one material, both of which are anchor chains or composite materials.

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