CN116461662A - Semi-submersible type offshore wind power platform - Google Patents

Semi-submersible type offshore wind power platform Download PDF

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Publication number
CN116461662A
CN116461662A CN202310513948.6A CN202310513948A CN116461662A CN 116461662 A CN116461662 A CN 116461662A CN 202310513948 A CN202310513948 A CN 202310513948A CN 116461662 A CN116461662 A CN 116461662A
Authority
CN
China
Prior art keywords
semi
offshore wind
platform
wind power
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310513948.6A
Other languages
Chinese (zh)
Inventor
周舒旎
郝玉恒
王伟龙
邵昌盛
刘昕瑶
赵子晗
陈宁
王强
李朋杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Haizhuang Offshore Wind Power Research Center Co ltd
Southern Marine Science and Engineering Guangdong Laboratory Zhanjiang
Original Assignee
Guangdong Haizhuang Offshore Wind Power Research Center Co ltd
Southern Marine Science and Engineering Guangdong Laboratory Zhanjiang
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Haizhuang Offshore Wind Power Research Center Co ltd, Southern Marine Science and Engineering Guangdong Laboratory Zhanjiang filed Critical Guangdong Haizhuang Offshore Wind Power Research Center Co ltd
Priority to CN202310513948.6A priority Critical patent/CN116461662A/en
Publication of CN116461662A publication Critical patent/CN116461662A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
    • B63B43/02—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking
    • B63B43/04—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving stability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B2035/442—Spar-type semi-submersible structures, i.e. shaped as single slender, e.g. substantially cylindrical or trussed vertical bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B2035/4433—Floating structures carrying electric power plants
    • B63B2035/446—Floating structures carrying electric power plants for converting wind energy into electric energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/727—Offshore wind turbines

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Wind Motors (AREA)

Abstract

The invention discloses a semi-submersible type offshore wind power platform, which relates to the technical field of offshore wind power generation and specifically comprises the following components: at least three upright posts are arranged around to form a polygonal structure, and two adjacent upright posts are connected through a supporting beam; the end face of at least one upright post is provided with a concave cavity which extends along the axial direction of the upright post. In the platform resetting process of the semi-submersible type offshore wind power platform disclosed by the invention, because the air at the upper part of the concave cavity has a tendency of being compressed or expanded, an extra restoring moment can be provided, so that the stability of the semi-submersible type offshore wind power platform can be improved; the semi-submersible type offshore wind power platform structure provided based on the design angle of the semi-submersible type floating platform can be used for realizing passive adjustment of the platform, compared with an active adjusting and controlling method, the semi-submersible type offshore wind power platform structure is simple in structure and high in reliability, and can reduce the amplitude of the swinging motion of the platform and improve the stability of the semi-submersible type offshore wind power platform under the condition that energy input is not needed.

Description

Semi-submersible type offshore wind power platform
Technical Field
The invention relates to the technical field of offshore wind power generation, in particular to a semi-submersible offshore wind power platform.
Background
Wind energy is used as a renewable natural energy source without generating any pollution emission, and is a new energy source with the most commercial scale development conditions in the current technology and economy. The coastline of 1.8 ten thousand kilometers is owned in China, the offshore wind energy resource reserves are large and the density is high, and the method has the advantage of large-scale development.
For sea areas with water depths exceeding 50 meters, floating fan foundations have more significant advantages in terms of economy and safety than fixed fan foundations. Because the floating wind power equipment is generally deployed in deep open sea, the environment condition of the floating wind power equipment is worse than that of the fixed wind power equipment. Because of the combined action of wind and wave currents, the floating wind power equipment can do six-degree-of-freedom motion, wherein pitching and rolling motions can obviously improve the load of the structure and reduce the power generation efficiency, so how to limit the swinging motion of the floating wind power equipment and improve the stability of a floating wind power platform becomes an engineering problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a semi-submersible type offshore wind power platform, and aims to solve the technical problem that the current offshore floating wind power equipment greatly improves structural load due to swinging motion generated under severe ocean environment, and the stability of the offshore floating wind power platform is insufficient, so that the power generation efficiency is reduced.
The invention adopts the following technical scheme to achieve the aim of the invention:
a semi-submersible offshore wind platform, the semi-submersible offshore wind platform comprising:
at least three upright posts are arranged around to form a polygonal structure, and two adjacent upright posts are connected through a supporting beam; at least one end face of the upright post is provided with a concave cavity, and the concave cavity extends along the axial direction of the upright post.
Further, the semi-submersible offshore wind platform further comprises a helical structure rotatably connected in the cavity.
Further, the spiral structure comprises a rotating shaft and a propeller; the rotating shaft extends along the axial direction of the upright post, the first end of the rotating shaft is connected to the bottom surface of the concave cavity, and the propeller is rotatably connected to the second end of the rotating shaft.
Further, the first end of the rotating shaft is connected to the bottom surface of the concave cavity in a flange sealing mode.
Further, the distance between the propeller and the bottom surface of the concave cavity is 5.8-6.2 meters.
Further, at least two layers of flexible guard plates are arranged in the concave cavity, the at least two layers of flexible guard plates are annular, and the rotating shaft penetrates through the inner rings of the at least two layers of flexible guard plates.
Further, the axial distance between two adjacent layers of the flexible guard plates is 1 meter.
Further, a flexible guard is disposed in the cavity.
Further, the flexible guard plate is made of rubber.
Further, the radius of the concave cavity is 0.3-0.35 times of the radius of the corresponding upright post.
Compared with the prior art, the invention has the beneficial effects that:
in the semi-submersible type offshore wind power platform provided by the invention, in the process of resetting the platform, because the air at the upper part of the concave cavity has a tendency of being compressed or expanded, an extra restoring moment can be provided, so that the stability of the semi-submersible type offshore wind power platform can be improved; the semi-submersible type offshore wind power platform structure provided by the scheme based on the design angle of the semi-submersible type floating platform can be used for realizing passive adjustment of the platform, and compared with an active adjustment method, the scheme has the advantages of simple structure and high reliability, and can reduce the amplitude of the swinging motion of the platform and improve the stability of the semi-submersible type offshore wind power platform under the condition of no energy input.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of a semi-submersible offshore wind platform according to an embodiment of the invention.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is involved in the embodiment of the present invention, the directional indication is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Referring to fig. 1, an embodiment of the present invention provides a semi-submersible offshore wind platform, comprising:
at least three upright posts 1, wherein at least three upright posts 1 are surrounded to form a polygonal structure, and two adjacent upright posts 1 are connected through a support beam 2; the end face of at least one upright 1 is provided with a concave cavity 11, and the concave cavity 11 extends along the axial direction of the upright 1.
Alternatively, referring to fig. 1, the radius of the cavity 11 is 0.3 to 0.35 times the radius of the corresponding pillar 1.
In this embodiment, taking three upright posts 1 as an example, the three upright posts 1 are all arranged along the vertical direction in an extending manner, the three upright posts 1 are connected and fixed through a supporting beam 2 to form a triangle structure in the figure, and each upright post 1 is respectively positioned on one vertex of the triangle; the supporting beam 2 may include a plurality of main beams arranged at intervals in a vertical direction and a reinforcing beam obliquely disposed between the adjacent main beams, and the reinforcing beam is used for improving structural strength of the semi-submersible offshore wind power platform. It can be understood that when the number of the columns 1 is more than three, the connection relationship between the columns 1 can be deduced in the same way, and the description thereof will be omitted.
The bottom surfaces of the three upright posts 1 are provided with vertically extending concave cavities 11, and the radius of each concave cavity 11 is preferably 1/3 of the radius of the corresponding upright post 1, so that sufficient space for fluid to flow is reserved, and meanwhile the influence on structural strength caused by the fact that the wall thickness of the upright post 1 is too thin is avoided. When the semi-submersible type offshore wind power platform is located in a working sea area, the bottom surface (namely the upper surface) of the concave cavity 11 is 5 meters higher than a standard water line, fluid in the concave cavity 11 is bounded by the height of the water line, air with standard atmospheric pressure is filled in the upper part of the water line, and seawater is filled in the lower part of the water line.
When the semi-submersible type offshore wind power platform is inclined, the upright post 1 in the sinking direction is sunk, the internal water pressure is increased, gas is compressed, and the free liquid level rises; in this process, since the air compression and expansion are necessarily present in the cavity portion at the upper portion of the cavity 11, the partial restoring moment is provided by the partial air during the restoring movement of the semi-submersible offshore wind platform, so that the stability of the semi-submersible offshore wind platform is increased.
Optionally, referring to fig. 1, the semi-submersible offshore wind platform further comprises a helical structure 3, the helical structure 3 being rotatably connected in the cavity 11.
Optionally, referring to fig. 1, a flexible shield 4 is disposed in the cavity 11.
Alternatively, referring to fig. 1, the flexible guard 4 is made of rubber.
Specifically, taking three upright posts 1 as an example, the bottom surfaces of the three upright posts 1 are provided with vertically extending concave cavities 11, the bottom surfaces (namely the upper surfaces) of the concave cavities 11 are 5 meters higher than a standard water line, fluid in the concave cavities 11 is bounded by the height of the water line, the upper parts of the water line are filled with air with standard atmospheric pressure, and the lower parts of the water line are filled with seawater; a spiral structure 3 is arranged below the water plane, and the spiral structure 3 can rotate under the impact of fluid in the concave cavity 11; a flexible guard 4 of rubber material is provided in the cavity portion above the water plane, the flexible guard 4 being arranged to reduce slamming of the cavity portion by fluid, thereby reducing locally large impact loads.
For the gas in the upper cavity part of the cavity 11, the relation between the volume and the pressure satisfies the Kelarong equation, and the specific steps are as follows:
wherein P is the gas pressure; v is the gas volume; m is the gas mass; m is the molar mass of the gas; r is a universal constant of gas, r=8.31J/mol; t is the gas temperature and T is in Kelvin. Assuming that temperature variations are not taken into account during the gas compression process, the gas volume is inversely proportional to the strength with which it is compressed.
For the free liquid surface in the lower part of the cavity 11, the water pressure is:
`
P＝ρhg
wherein P is ` Is the water pressure; ρ is the sea water density, ρ is 1035kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the h is the immersion height; g is the acceleration of gravity, g is 9.81m/s 2 . When the immersed height is 5 m and the semi-submersible type offshore wind power platform is inclined for 10 degrees, the water pressure is about 50.767kPa, the atmospheric pressure is about 101.325kPa, the total pressure of the gas at the upper part of the concave cavity 11 is 152.092kPa, and the gas volume is reduced to be 2/3 of the original volume.
When the semi-submersible type offshore wind power platform is inclined, the upright post 1 in the sinking direction is sunk, the internal water pressure is increased, gas is compressed, the free liquid level rises, and seawater flows through the spiral structure 3; if the seawater can induce the spiral structure 3 to rotate, part of the kinetic energy of the water flow is converted into the kinetic energy of the spiral structure 3 to rotate, and the part of the kinetic energy is gradually reduced through mechanical loss, so that the purposes of absorbing energy and reducing the movement amplitude are achieved; if the seawater fails to induce the spiral structure 3 to rotate, the kinetic energy can cut off part of the energy in a mode that viscous force does work due to the fact that water flows through the spiral structure 3, and therefore the purposes of absorbing energy and reducing movement amplitude can be achieved. In addition, since the air compression and expansion are necessarily present in the cavity portion at the upper portion of the cavity 11, the partial restoring moment is provided by the partial air when the semi-submersible offshore wind platform returns, so that the stability of the semi-submersible offshore wind platform is increased.
Therefore, the semi-submersible offshore wind power platform provided by the embodiment can obtain the following beneficial technical effects:
1. when the semi-submersible offshore wind power platform is inclined in a small amplitude, the spiral structure 3 in the concave cavity 11 can be used for reducing energy, so that the purpose of reducing the vibration is achieved;
2. in the process of resetting the platform, because the air at the upper part of the concave cavity 11 has a tendency of being compressed or expanded, additional restoring moment can be provided, so that the stability of the semi-submersible type offshore wind power platform can be improved;
3. by arranging a plurality of flexible guard plates 4 made of rubber at the upper part of the concave cavity 11, the purposes of reducing slamming of fluid to the hollow cavity part and reducing local larger impact load can be achieved.
The scheme of the embodiment provides a passive adjusting method capable of effectively reducing the swinging motion of the platform based on the design angle of the semi-submersible floating platform, and compared with an active adjusting method, the scheme has the advantages of simple structure and high reliability, and can reduce the amplitude of the swinging motion of the platform without energy input.
Optionally, referring to fig. 1, the screw structure 3 includes a rotation shaft 31 and a propeller 32; the rotating shaft 31 extends along the axial direction of the upright 1, a first end of the rotating shaft 31 is connected to the bottom surface of the concave cavity 11, and the propeller 32 is rotatably connected to a second end of the rotating shaft 31.
Optionally, referring to fig. 1, the first end of the shaft 31 is connected to the bottom surface of the cavity 11 by a flange seal.
Alternatively, referring to fig. 1, the distance between the propeller 32 and the bottom surface of the cavity 11 is 5.8-6.2 meters.
Optionally, referring to fig. 1, at least two layers of flexible guard plates 4 are disposed in the cavity 11, at least two layers of flexible guard plates 4 are annular, and the rotating shaft 31 is disposed in an inner ring of at least two layers of flexible guard plates 4.
Alternatively, referring to fig. 1, the axial distance between two adjacent flexible shields 4 is 1 meter.
Illustratively, by the structural form that the propeller 32 is matched with the rotating shaft 31, the height position of the propeller 32 can be more conveniently set; specifically, the propeller 32 is disposed at a position about 1 meter below the water plane, that is, the vertical distance between the propeller 32 and the bottom surface (i.e., upper surface) of the cavity 11 is preferably 6 meters, the center of the propeller 32 is connected to the rotating shaft 31, and the rotating shaft 31 is connected to the bottom surface (i.e., upper surface) of the cavity 11 via a flange in a sealing manner; the cavity part at the upper part of the cavity 11 is provided with a layer of flexible guard plates 4 at intervals of 1 meter, and three layers of flexible guard plates 4 are arranged. Based on the structural form, the slamming of the fluid to the cavity can be reduced better, so that the local larger impact load is reduced.
It should be noted that, other contents of the semi-submersible offshore wind power platform disclosed by the invention can be referred to the prior art, and are not described herein.
The foregoing is only an optional embodiment of the present invention, and is not limited to the scope of the patent application, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the patent application.

Claims (10)

1. A semi-submersible offshore wind platform, the semi-submersible offshore wind platform comprising:
at least three upright posts are arranged around to form a polygonal structure, and two adjacent upright posts are connected through a supporting beam; at least one end face of the upright post is provided with a concave cavity, and the concave cavity extends along the axial direction of the upright post.
2. The semi-submersible offshore wind platform of claim 1, further comprising a helical structure rotatably coupled in the cavity.
3. The semi-submersible offshore wind platform of claim 2, wherein the helical structure comprises a shaft and a propeller; the rotating shaft extends along the axial direction of the upright post, the first end of the rotating shaft is connected to the bottom surface of the concave cavity, and the propeller is rotatably connected to the second end of the rotating shaft.
4. A semi-submersible offshore wind platform as recited in claim 3 wherein the first end of the shaft is connected to the bottom surface of the cavity by a flange seal.
5. A semi-submersible offshore wind platform as recited in claim 3 wherein a distance between the propeller and a bottom surface of the cavity is between 5.8 and 6.2 meters.
6. A semi-submersible offshore wind power platform as recited in claim 3 wherein at least two layers of flexible guard plates are disposed in the cavity, the at least two layers of flexible guard plates are annular, and the rotating shaft is disposed in an inner ring of the at least two layers of flexible guard plates.
7. The semi-submersible offshore wind platform recited in claim 6 wherein an axial distance between adjacent two layers of the flexible shield is 1 meter.
8. The semi-submersible offshore wind platform of claim 1, wherein a flexible shield is disposed in the cavity.
9. The semi-submersible offshore wind platform according to claim 6 or 8, wherein the flexible guard is rubber.
10. The semi-submersible offshore wind platform of claim 1, wherein the radius of the cavity is between 0.3 and 0.35 times the radius of the corresponding column.
CN202310513948.6A 2023-05-08 2023-05-08 Semi-submersible type offshore wind power platform Pending CN116461662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310513948.6A CN116461662A (en) 2023-05-08 2023-05-08 Semi-submersible type offshore wind power platform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310513948.6A CN116461662A (en) 2023-05-08 2023-05-08 Semi-submersible type offshore wind power platform

Publications (1)

Publication Number Publication Date
CN116461662A true CN116461662A (en) 2023-07-21

Family

ID=87180807

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310513948.6A Pending CN116461662A (en) 2023-05-08 2023-05-08 Semi-submersible type offshore wind power platform

Country Status (1)

Country Link
CN (1) CN116461662A (en)

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