CN114771759A - Buoyancy eccentric semi-submerged floating type fan foundation suitable for large megawatt unit - Google Patents
Buoyancy eccentric semi-submerged floating type fan foundation suitable for large megawatt unit Download PDFInfo
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- 238000007667 floating Methods 0.000 title claims abstract description 68
- 230000008719 thickening Effects 0.000 claims description 27
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- 238000002955 isolation Methods 0.000 claims description 5
- 238000005188 flotation Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 20
- 239000010959 steel Substances 0.000 abstract description 20
- 238000010276 construction Methods 0.000 abstract description 18
- 230000005484 gravity Effects 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- 238000009434 installation Methods 0.000 description 6
- 239000013535 sea water Substances 0.000 description 4
- 238000010248 power generation Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
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- 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
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- 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
- B63B43/18—Improving safety of vessels, e.g. damage control, not otherwise provided for preventing collision or grounding; reducing collision damage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
- F03D13/25—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors specially adapted for offshore installation
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- 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
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- 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
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- 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
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Abstract
The invention relates to a buoyancy eccentric type semi-submerged floating fan foundation suitable for a large megawatt unit. Three perpendicular stand contains a fan stand and two non-fan stands, and the fan stand includes that the stand bottom adds thick section, second center post and second stand waterline face and adds thick section, and non-fan stand includes first center post and first stand waterline face and adds thick section. The thickened section of the bottom of the upright post of the fan upright post or the thickened upright post provides larger buoyancy to be directly balanced with most gravity of the fan unit, so that the weight and ballast amount in the non-fan upright post and the horizontal floating box are greatly reduced, the bending moment applied to the horizontal floating box and the support rod is reduced, and the steel consumption and the construction difficulty of the non-fan upright post, the horizontal floating box and the support rod are reduced.
Description
Technical Field
The invention relates to the field of ocean engineering and offshore wind power generation systems, in particular to a buoyancy eccentric semi-submersible floating type fan foundation suitable for a large megawatt unit.
Background
The semi-submersible type fan foundation has the advantages of good stability, wide range of water depth, convenient construction, transportation and installation and the like, and becomes one of the key research forms of the current floating type fan foundation design researchers.
In order to achieve the carbon reduction goal in China, the relatively mature wind power becomes an important alternative scheme of the traditional coal power. Offshore wind power becomes an important development direction of wind power by virtue of the advantages of better wind resource condition, less influence on environment and human production and life, being close to the coastal economic center of China and being beneficial to being consumed nearby, and the like. The offshore wind power trend is a necessary trend towards deep and open sea due to the limited offshore development area. The fixed foundation is not economically feasible when being applied to deep and open sea wind power, so that a floating type fan foundation type which is stable, excellent in motion performance, technically feasible, small in steel consumption, convenient to construct and install and economical needs to be developed.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a buoyancy eccentric semi-submersible floating type wind turbine foundation suitable for large megawatt units, which not only has good stability and motion performance, but also saves steel amount.
In order to achieve the purpose, the invention adopts the following technical scheme:
a buoyancy eccentric type semi-submerged floating fan foundation suitable for a large megawatt unit comprises a semi-submerged floating fan foundation, wherein the semi-submerged floating fan foundation comprises three vertical upright posts, three horizontal floating boxes, three groups of support rods and two heave plates; it is three perpendicular stand is located equilateral triangle's three summit place respectively, and is three horizontal flotation tank is used for connecting adjacent two respectively the bottom of perpendicular stand, three vaulting poles of group are adjacent two with connecting respectively the top and the top of perpendicular stand, three perpendicular stand include two non-fan stand and a fan stand, and two non-fan stand shapes are the same, two hang down and swing the board and connect respectively two the bottom of non-fan stand, fan stand bottom or whole thickening.
Further, the non-fan upright post is formed to include a first center upright post and a first upright post waterline surface thickening section, the first upright post waterline surface thickening section is fixed on the first center upright post, and the diameter of the first upright post waterline surface thickening section is larger than that of the first center upright post.
Further, the fan stand forms to include the thick section of stand bottom, second center post and second stand waterline face and adds thick section, the thick section of stand bottom is fixed the bottom of second center post, the thick section of second stand waterline face is fixed the upper portion of second center post, the diameter that the thick section of stand bottom and second stand waterline face add thick section all is greater than the diameter of second center post. The fan column may also be formed as a unitary thickened column having a diameter greater than the diameter of the first central column.
Furthermore, the diameter of the first column waterline surface thickening section and the diameter of the second column waterline surface thickening section are respectively greater than the diameter of the first center column and the diameter of the second center column, the first column waterline surface thickening section and the second column waterline surface thickening section respectively have a certain height above and below the waterline surface, and the first column waterline surface thickening section and the second column waterline surface thickening section respectively form a layer of anti-collision isolation cabin along the radial direction between the first center column and the second center column.
Furthermore, the second upright post waterline surface thickening section, the upright post bottom thickening section and the second central upright post are directly connected or indirectly connected through a transition section, and the transition section is an inclined shaft plate or a closed circular truncated cone. The connection between the first upright post waterline surface thickening section and the first central upright post is similar to the connection between the second upright post waterline surface thickening section, the upright post bottom thickening section and the second central upright post.
Furthermore, the cross section of the horizontal buoyancy tank is circular or square, the bottom of the horizontal buoyancy tank and the bottom surface of the vertical upright post are positioned on the same horizontal plane, and a ballast tank is arranged inside the horizontal buoyancy tank.
Furthermore, every group the vaulting pole of connecting the stand all includes a horizontal support pole and two diagonal bracing pieces, the both ends of horizontal support pole are connected with the upper portion of adjacent first center post and second center post respectively, two the top of diagonal bracing piece with the middle part of horizontal support pole is connected, and the bottom is connected with the bottom of adjacent stand bottom thickening section and first center post respectively.
Furthermore, the heave plate is a thin plate, can be additionally provided with a reinforcing structure according to the structural strength requirement, can be positioned at the bottom of the buoyancy tank or the upright post, and can extend to the inner side or the outer side for a certain length. The heave plate is a circular ring, a regular rectangle or other shapes, and can be a continuous thin plate or be discontinuous.
Further, the buoyancy eccentric type semi-submersible floating type fan foundation suitable for the large megawatt unit further comprises a fan unit, a mooring system and a dynamic cable which are installed on the semi-submersible floating type fan foundation.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) according to the semi-submersible floating type fan foundation provided by the invention, the diameter of the central upright post is smaller, the span distance between the upright posts is larger, and better platform stability can be realized while the construction steel quantity is saved;
(2) the design of the thickened upright column with the diameter of the thickened section at the bottom of the upright column of the fan upright column larger than that of the central upright column of the non-fan upright column can directly provide larger buoyancy at the bottom of the fan unit, so that the weight and the internal pressure loading capacity of the non-fan upright column and the horizontal buoyancy tank close to the non-fan upright column are greatly reduced, the internal cabin division of the non-fan upright column and the horizontal buoyancy tank can be simplified, and the steel quantity and the construction difficulty are reduced; meanwhile, the bending moment borne by the horizontal buoyancy tank and the stay bar connected with the upright post is reduced, the internal reinforcing structure of the horizontal buoyancy tank can be simplified, the diameter of the stay bar connected with the upright post is reduced, and the steel quantity and the construction difficulty are further reduced;
(3) the design of the thick section of the water line surface of the upright column can provide larger restoring torque near the water line surface under the condition of increasing a small amount of steel, improve the integral stability, reduce the overall inclination angle of the operating condition platform and improve the generating efficiency of the fan; meanwhile, the design of the thick sections of the waterplane surfaces of the stand columns is equivalent to adding a layer of anti-collision isolation cabin on the outer sides of the stand columns, and the collision near the waterplane surfaces can not cause the breakage of the central stand columns, namely, the stability of the semi-submersible floating fan foundation can not be obviously influenced, so that the division of the inner cabins of the central stand columns can be simplified, and the steel quantity and the construction difficulty can be reduced;
(4) the cross section of the horizontal buoyancy tank can be square or in other shapes, the layout is triangular, and the structure is stable; the horizontal cross section of the horizontal buoyancy tank is small in size, is far away from the water line surface, and is subjected to smaller wave force, so that the wave load characteristic of the semi-submersible floating type fan foundation is better; the horizontal buoyancy tank can provide enough buoyancy in water depth limited areas such as a wharf and the like, so that the general assembly and debugging of the wharf and the towing operation of a port are ensured to be smoothly carried out, and the high cost of offshore installation is effectively avoided; the horizontal buoyancy tank can be directly communicated with external seawater through opening at the installation and operation sea area of the fan, seawater is not required to be injected into a ballast water tank in the horizontal buoyancy tank through a ballast pump, so that the semi-submersible floating type fan foundation reaches the design draft position, the design of the ballast water tank and an internal pipeline in the horizontal buoyancy tank is simplified, and the construction cost of the semi-submersible floating type fan foundation is reduced;
(5) the vertical columns and the heave plate structure at the bottom of the floating box are arranged on the inner side or the outer side of the vertical columns or the floating box, so that the additional mass and the motion damping of the semi-submersible floating fan foundation can be increased, and the effect of adjusting the inherent period of the motion of the semi-submersible floating fan foundation is achieved; meanwhile, the heave plate structure can be set to be continuous or disconnected according to requirements, and the possibility of interference with dynamic cables and mooring cables is reduced.
Drawings
Fig. 1 is a three-dimensional schematic view of a buoyancy eccentric semi-submersible floating wind turbine foundation suitable for a large megawatt unit according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of an embodiment of a semi-submersible floating wind turbine foundation according to the present invention;
FIG. 3 is a schematic structural diagram of another embodiment of a semi-submersible floating wind turbine foundation according to the present invention;
FIG. 4 is a top view of the semi-submersible floating wind turbine foundation of FIG. 2 below the waterline.
Description of reference numerals:
1-a fan unit, 11-a fan blade, 12-a cabin, 13-a tower, 2-a semi-submersible floating fan base, 21-a vertical upright post, 22-a horizontal buoyancy tank, 23-a stay bar, 24-a heave plate, 25-an isolation anti-collision cabin, 211-a fan upright post, 212-a non-fan upright post, 2111-a thickened section at the bottom of the fan upright post, 2112-a second central upright post, 2113-a thickened section at the water line surface of the second upright post, 2114-a thickened upright post, 2121-a first central upright post, 2122-a thickened section at the water line surface of the first upright post, 231-a horizontal support bar, 232-a diagonal support bar, 3-a mooring system, 31-a mooring cable, 32-a mooring anchor and 4-a dynamic cable.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used to define elements only for convenience in distinguishing between the elements, and unless otherwise stated have no special meaning and are not to be construed as indicating or implying any relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The embodiment of the invention provides a buoyancy eccentric semi-submersible floating type fan foundation suitable for a large megawatt unit, which comprises three vertical upright posts, three horizontal floating boxes, three groups of support rods and two heave plates; it is three perpendicular stand is located equilateral triangle's three summit place respectively, and is three horizontal buoyancy tank is used for connecting adjacent two respectively perpendicular stand's bottom, three vaulting poles of group are adjacent two with connecting respectively perpendicular stand's top, three perpendicular stand include two non-fan stands and a fan stand, and two non-fan stand shapes are the same, fan stand bottom or whole thickening, the center of two non-fan stands and fan stand is located equilateral triangle's three summit respectively. The thickened section of the bottom of the upright post of the fan upright post or the thickened upright post provides larger buoyancy to be directly balanced with most gravity of the fan unit, so that the weight and ballast amount in the non-fan upright post and the horizontal floating box are greatly reduced, the bending moment applied to the horizontal floating box and the support rod is reduced, and the steel consumption and the construction difficulty of the non-fan upright post, the horizontal floating box and the support rod are reduced.
Example 1
As shown in fig. 1, embodiment 1 of the present invention provides a center-of-gravity buoyancy eccentric semi-submersible floating wind turbine foundation suitable for a large megawatt unit, which includes a wind turbine unit 1, a semi-submersible floating wind turbine foundation 2, a mooring system 3, and a dynamic cable 4.
The wind turbine set 1 comprises wind turbine blades 11, an engine room 12 and a tower barrel 13, wherein the engine room 12 is installed at the top of the tower barrel 13, the wind turbine blades 11 are connected with the engine room 12, and the wind turbine set 1 is connected with the semi-submersible floating wind turbine foundation 2 through the tower barrel 13.
The semi-submersible floating type fan foundation 2 is used for bearing the upper fan unit 1 and comprises three vertical upright posts 21, three horizontal floating boxes 22, three groups of support rods 23 and two heave plates 24, and offshore positioning is achieved through the multipoint distributed mooring system 3.
The mooring system 3 comprises mooring lines 31, mooring anchors 32. The top end of the mooring line 31 is connected to the vertical column 21, and the specific connection position is determined by the specific water depth and the design of the mooring system, and may be the side surface of the vertical column 21 above the water plane or the side surface close to the bottom end of the vertical column 21 below the water plane. The bottom end of the mooring line 31 is secured to the sea floor by a mooring anchor 32.
As shown in fig. 2, the three vertical pillars 21 include a fan pillar 211 and two non-fan pillars 212, where the two non-fan pillars 212 have the same shape, and the centroids of the bottom surfaces of the three vertical pillars 21 are located at the vertexes of an equilateral triangle respectively. Non-fan column 212 includes a first center column 2121 and a first column waterline-faced enlarged section 2122, and fan column 211 includes a column bottom enlarged section 2111, a second center column 2112, and a second column waterline-faced enlarged section 2113. The bottom end of the tower 13 is connected with the upper part of the fan upright post 211 in the vertical upright post 21 through structural forms such as size transition, and the transition part can be positioned above the fan upright post 211 or positioned inside the fan upright post 211.
The thickened section 2111 at the bottom of the fan upright 211 directly provides larger buoyancy at the bottom of the fan to balance with most gravity or all gravity of the fan unit 1, so that the weight and the internal pressure capacity of the non-fan upright 212 and the horizontal buoyancy tank 22 close to the non-fan upright 212 are reduced, and therefore, the non-fan upright 212 can adopt a smaller diameter to reduce the steel consumption, the cabin division of the non-fan upright 212 and the horizontal buoyancy tank 22 can be simplified, the steel consumption is reduced, and the construction difficulty is reduced.
Further, most of or all of the gravity of the fan unit 1 is directly balanced with the buoyancy provided by the fan upright post 211, so that the bending moment applied to the horizontal buoyancy tank 22 and the brace 23 is reduced, the internal reinforcing structure of the horizontal buoyancy tank can be simplified, the diameter of the brace connected with the upright post is reduced, and the steel quantity and the construction difficulty are further reduced. The second upright waterplane surface thickened section 2113 and the first upright waterplane surface thickened section 2122 are equivalent to sleeving a layer of large-diameter shell on the outer sides of the second central upright 2112 and the first central upright 2121 near the waterplane surface, and a certain height is respectively arranged above and below the waterplane surface, so that a larger restoring moment is provided, therefore, the second central upright 2112 and the first central upright 2121 can adopt a smaller diameter to reduce the steel consumption, and the stability of the semi-submersible floating fan foundation is improved by utilizing the second upright waterplane surface thickened section 2113 and the first upright waterplane surface thickened section 2122.
As shown in fig. 4, further, a layer of anti-collision isolation cabin 25 is formed between the second column waterline-surface thickened section 2113 and the first column waterline-surface thickened section 2122 and the second central column 2112 and the first central column 2121 respectively, so that the division of the internal cabins of the second central column 2112 and the first central column 2121 is simplified, and the steel consumption and the construction difficulty are reduced.
The thick section 2111 at the bottom of the fan upright post 211 and the second central upright post 2112, and the thick section 2113 at the waterline surface of the second upright post and the second central upright post 2112 can be directly connected, and can also be connected as a transition section in the forms of an inclined shaft plate, a closed circular truncated cone and the like, and are specifically determined by the structural design and the construction difficulty. The connection between first strut waterplane area thickening 2122 of non-fan strut 212 and first center strut 2121 is similar to the connection between second waterplane area thickening 2113 of fan strut 211 and second center strut 2112.
The lowest end of each horizontal buoyancy tank 22 and the bottom surfaces of the vertical columns 21 are located on the same horizontal plane, and each horizontal buoyancy tank 22 is connected with two adjacent vertical columns 21 and used for providing enough buoyancy in water depth limited areas such as a wharf, ensuring that wharf final assembly debugging and port towing can be implemented, and avoiding high cost of offshore installation. Further, the horizontal buoyancy tank 22 may have a circular, square, or other cross-sectional shape, and may be more structurally stable and may be more uniformly subjected to bending moments in multiple directions. Further, the horizontal cross section of the horizontal buoyancy tank 22 is small in size and far away from the water line surface, so that the wave force received by the horizontal buoyancy tank is small, the movement performance of the semi-submersible floating type fan foundation 2 is better, and the annual power generation time of the fan is prolonged.
Further, as the draft of the semi-submersible floating type fan foundation 2 is basically unchanged during in-service period, the ballast capacity does not need to be adjusted frequently, only a ballast tank is arranged inside the horizontal floating tank 22, a personnel overhaul channel and a longer ballast pipeline are not arranged, the required ballast capacity pressing operation can be completed by connecting the ballast tanks into the ballast pipelines in the adjacent vertical upright posts 21 through interfaces, the ballast utilization rate is improved, meanwhile, the construction difficulty and the steel quantity of the floating tank 22 are reduced, the horizontal floating tank 22 can be directly communicated with external seawater, ballast of the ballast tank inside the horizontal floating tank 22 is not needed through a ballast pump, the internal pipeline of the floating tank 22 is simplified, and the construction difficulty and the steel quantity of the floating tank 22 are reduced.
Each group of the struts 23 of the connecting upright is composed of a horizontal strut 231 and two oblique struts 232, the horizontal strut 231 is connected with the upper parts of the central uprights 2121 or 2112 of the two adjacent vertical uprights 21, and the oblique struts 232 are respectively connected with the middle parts of the horizontal struts 231 and the lower parts of the thickened sections 2111 at the bottoms of the upright 211 of the adjacent vertical uprights 21 or the lower parts of the central uprights 2121 of the non-fan uprights 212. Further, the diameters of the horizontal supporting rod 231 and the two inclined supporting rods 232 may be different. Preferably, the connection position of the oblique support rod 232 and the lower part of the column bottom thickened section 2111 of the fan column 211 or the lower part of the central column 2121 of the non-fan column 212 is higher than the height of the horizontal buoyancy tank 22, so that the interference between the oblique support rod 231 and the horizontal buoyancy tank 22 is avoided, and the difficulty in building and welding caused by inserting the oblique support rod into the buoyancy tank is reduced. By adopting the form of the stay bar 23, the integral stability of the structure can be improved, and the load required to be borne by the buoyancy tank is reduced, so that the steel quantity of the buoyancy tank can be reduced.
The heave plate 24 is a thin plate, can be fixed at the bottom of a buoyancy tank or an upright post through welding, bolt connection or other connection forms, and can horizontally extend for a certain length to the inner side or the outer side of a triangular area enclosed by the semi-submersible floating fan foundation 2, and the heave plate 24 is beneficial to increasing the additional mass and the motion damping of the semi-submersible floating fan foundation 2 and adjusting the motion performances such as the inherent motion period of the semi-submersible floating fan foundation 2. The heave plate 24 may be circular, regular rectangular or other shape, may be a continuous sheet or discontinuous, may add structural reinforcement to the structure, and may avoid interference with the dynamic cables 4, mooring lines 31, etc. Structural failure or detachment of the heave plate 24 does not affect the structural integrity of the vertical column 21 and the horizontal pontoon 22.
The generated energy of the fan unit 1 is output through the dynamic cable 4, and the dynamic cable 4 can be accessed through the bottom of the fan upright post 211, and can also climb from the outside of the fan upright post 211, or be connected with the fan unit in other climbing modes.
As a specific embodiment of the above-mentioned semi-submersible floating wind turbine, for a 15MW wind generating set, a typical scale of a gravity center buoyancy eccentric semi-submersible floating wind turbine foundation suitable for a large megawatt set is: the diameter of the thickened section at the bottom of the upright post of the fan upright post is 19m, the diameter of the central upright post of the fan upright post and the non-fan upright post is 10m, and the span between the centers of the vertical upright posts is 85 m; the diameter of the water line surface thickening section of the fan upright post and the non-fan upright post is 15m, and the height of the water line surface thickening section is 5m above and below the water line surface; the diameter of the section of the horizontal buoyancy tank is 4m, the length of the horizontal buoyancy tank between the fan upright post and the non-fan upright post is 70.5m, and the length of the horizontal buoyancy tank between the non-fan upright posts is 75 m; the diameter of the stay bar is 2.5 m; the diameter of the heave plate is 28 m; the total draft is 20m, the column freeboard is 12m, and the water displacement is 10803 t.
The semi-submersible floating type fan foundation 2 provided by the invention can save steel quantity, simultaneously realize better stability and motion performance, and ensure the annual power generation duration of the fan and the safety under the adverse sea condition of 50 years; the thickened section 2111 at the bottom of the vertical column of the fan vertical column 211 provides larger buoyancy to be directly balanced with most of the gravity of the fan unit 1, so that the weight and the pressure load capacity in the non-fan vertical column 212 and the horizontal buoyancy tank 22 are greatly reduced, the bending moment borne by the horizontal buoyancy tank 22 and the support rod 23 is reduced, and the steel consumption and the construction difficulty of the non-fan vertical column 212, the horizontal buoyancy tank 22 and the support rod 23 are reduced; the horizontal buoyancy tank 22 is directly communicated with external seawater in a fan installation water area, and a ballast pump is not needed to carry ballast to a ballast water tank inside the horizontal buoyancy tank 22, so that internal pipelines of the buoyancy tank 22 are simplified, and the construction difficulty and steel quantity of the buoyancy tank 22 are reduced; the vertical upright posts 21 and the horizontal buoyancy tanks 22 can provide enough buoyancy, so that assembly debugging is not limited by the depth of water of most wharfs in China, the fan unit 1 and the semi-submersible floating fan foundation 2 can be selected to be close to a construction site of a service place for assembly debugging and then are towed integrally, risks caused by towing of a long distance are avoided, and transportation and installation costs are reduced.
Example 2
As shown in fig. 3, the difference between embodiment 2 and embodiment 1 is that the column bottom thickened section 2111, the second central column 2112 and the second column waterline surface thickened section 2113 of the fan column 211 can also be replaced by a thickened column 2114 with a diameter larger than that of the first column waterline surface thickened section 2122 of the non-fan column 212, and the thickened column 2114 directly provides larger buoyancy at the bottom of the fan to balance most of or all of the gravity of the fan unit 1, thereby reducing the construction difficulty of the fan column while reducing the weight of the non-fan column 212 and the horizontal buoyancy tank 22 close to the non-fan column 212 and the amount of internal pressure.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The buoyancy eccentric type semi-submerged floating fan foundation is suitable for a large megawatt unit and is characterized by comprising a semi-submerged floating fan foundation, wherein the semi-submerged floating fan foundation comprises three vertical upright posts, three horizontal floating boxes, three groups of support rods and two heave plates; it is three perpendicular stand is located equilateral triangle's three summit place respectively, and is three horizontal flotation tank is used for connecting adjacent two respectively the bottom of perpendicular stand, three vaulting poles of group are adjacent two with connecting respectively the top and the top of perpendicular stand, three perpendicular stand include two non-fan stand and a fan stand, and two non-fan stand shapes are the same, two hang down and swing the board and connect respectively two the bottom of non-fan stand, fan stand bottom or whole thickening.
2. The semi-submersible floating wind turbine foundation of claim 1 wherein the non-fan columns are formed to include a first center column and a first column waterplane area thickening section secured to the first center column, the first column waterplane area thickening section having a diameter greater than a diameter of the first center column.
3. The semi-submersible floating fan foundation of claim 2 wherein the fan columns are formed to include column bottom upset sections, a second center column, and a second column waterplane area upset section, the column bottom upset sections being secured to the bottom of the second center column, the second column waterplane area upset sections being secured to the upper portion of the second center column, the column bottom upset sections and the second column waterplane area upset sections each having a diameter greater than the diameter of the second center column.
4. The semi-submersible floating fan foundation of claim 2 wherein the fan columns are also formed as a single, thickened column having a diameter greater than the diameter of the first center column.
5. The semi-submersible floating fan foundation according to claim 3, wherein the diameters of the first and second column waterplane surface thickening sections are respectively greater than the diameters of the first and second central columns, the first and second column waterplane surface thickening sections have a certain height above and below the waterplane surface, and a layer of anti-collision isolation cabin is formed between the first and second column waterplane surface thickening sections and the first and second central columns along the radial direction.
6. The semi-submersible floating fan foundation according to claim 3, wherein the second central upright is directly connected or indirectly connected through a transition section, and the transition section is an inclined shaft plate or a closed circular truncated cone.
7. The semi-submersible floating fan foundation according to claim 1, wherein the horizontal buoyancy tank is circular or square in cross section, the bottom of the horizontal buoyancy tank and the bottom surface of the vertical column are located at the same horizontal plane, and a ballast tank is arranged inside the horizontal buoyancy tank.
8. The semi-submersible floating type fan foundation as claimed in claim 1, wherein each group of the struts connecting the upright columns comprises a horizontal strut and two inclined struts, two ends of the horizontal strut are respectively connected with the upper parts of the adjacent first central upright column and the second central upright column, the tops of the two inclined struts are connected with the middle part of the horizontal strut, and the bottoms of the two inclined struts are respectively connected with the bottom thickened section of the adjacent upright column and the bottom of the first central upright column.
9. The foundation of claim 1, wherein the heave plate is a thin plate which is located at the bottom of the pontoon or the pillar and extends to a certain length towards the inner side or the outer side, the heave plate is a circular ring, a regular rectangle or other shape, and the heave plate is a continuous thin plate or an intermittent thin plate.
10. The buoyant eccentric semi-submersible floating wind turbine foundation applicable to large megawatt units according to claim 1, further comprising a wind turbine unit, a mooring system and dynamic cables.
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