CN110844012B - Deep draft semi-submersible offshore converter station - Google Patents
Deep draft semi-submersible offshore converter station Download PDFInfo
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- CN110844012B CN110844012B CN201911119018.2A CN201911119018A CN110844012B CN 110844012 B CN110844012 B CN 110844012B CN 201911119018 A CN201911119018 A CN 201911119018A CN 110844012 B CN110844012 B CN 110844012B
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- 238000007667 floating Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000004873 anchoring Methods 0.000 claims abstract description 14
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- 239000010410 layer Substances 0.000 claims description 72
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- 238000006243 chemical reaction Methods 0.000 claims description 9
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- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
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- 230000003139 buffering effect Effects 0.000 claims description 3
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Classifications
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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
- 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
- B63B2021/505—Methods for installation or mooring of floating offshore platforms on site
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
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- Structural Engineering (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
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Abstract
The invention relates to a deep draft semi-submersible offshore converter station, which is suitable for the field of offshore wind power development, in particular to the field of open sea wind power generation with the water depth of more than 40 meters. The deep-draft semi-submersible type offshore converter station comprises an upper assembly block, four supporting columns, a bypass space, a lower floating body and a mooring system, wherein the supporting columns are connected with the adjacent supporting columns through the bypass space, the supporting columns are used for supporting the upper assembly block upwards, the lower floating body is connected below the supporting columns and used for adjusting the draft of the deep-draft semi-submersible type offshore converter station, and the mooring system is used for positioning and fixing the deep-draft semi-submersible type offshore converter station; the upper assembly is always above the sea surface, and the support column part, the lower floating body and the mooring line anchoring system are all below the sea surface. The structure provided by the invention can be repeatedly utilized, the position can be flexibly adjusted, and the operation of the factory returning transportation process after disaster or after decommissioning is simple, and the offshore cutting is not needed.
Description
Technical Field
The invention relates to a deep draft semi-submersible offshore converter station, which is suitable for the field of offshore wind power development, in particular to the field of open sea wind power generation with the water depth of more than 40 meters.
Background
With the development of offshore wind power continuously developing to deep sea, an offshore wind farm needs to be configured with an increasingly large offshore electric platform for collecting and boosting electric energy generated by a wind generating set. Offshore converter stations employing flexible dc technology will have significant economic advantages when offshore distances exceed a certain level. Because the station is internally provided with large-scale electrical equipment such as a converter valve, a bridge arm reactor and the like, the weight of the offshore converter station is far more than that of the offshore alternating current booster station, and can reach 2-3 ten thousand tons. For an offshore converter station which can be applied to a water depth of 40-50 m, the current technical solution is to install the offshore converter station by adopting a sitting-bottom gravity platform or a conduit frame type platform-a floating method. The former has very high requirements on the flatness of the place where the structure is located, and the cost of carrying out offshore artificial field leveling is very huge, so the application range is greatly limited. The application of the latter in offshore oil and gas industry has matured gradually, and foreign countries are beginning to explore offshore converter stations. However, the following technical problems exist in the fixed offshore converter station installed by the floating method:
1) In order to buffer the impact effect of the upper and lower blocks during butt-joint installation, a pile leg coupling device LMU (LEG MATING Unit), a block deck support Unit DSU (Deck Supporting Unit), a heave and heave fender and the like are generally required to be arranged, so that the design and construction difficulties are high and the cost is high;
2) If the conditions of severe geological conditions and shallow bedrock burial are met, the pile foundation engineering of the fixed platform needs rock embedding treatment, so that the safety risk is high and the engineering economy is poor;
3) The technical risks of ship positioning, control and anti-collision in the floating operation are relatively high, the installation docking time can be prolonged when accidents such as mechanical equipment faults occur, the weather window period is missed, the structure is damaged, and similar cases are already occurred in the engineering practice of floating installation of the marine oil and gas platform at present;
4) The blocks for accommodating large-scale electrical equipment are all concentrated on the upper part of the structure, the gravity center is high, the horizontal area is large, the structural response level is very high under the action of inertial force working conditions such as earthquake, transportation and the like, and the defects of insufficient bearing margin and poor usability exist.
None of the existing offshore converter station technologies provides a reasonable solution to the 3 problems. The solution of the stationary platform (patent publication CN 207559399U) is in fact to generally follow the layout concept of the onshore converter station, only by layering to reduce the horizontal size of the block, but at the cost of offset and increase of the center of gravity. Under this kind of technical scheme, no matter to upper portion chunk or lower part fixed support chunk, structural stress performance is all relatively poor, and the space of total arrangement scheme optimization is also extremely limited. Therefore, it is needed to provide a reasonable and effective offshore converter station structure type, so as to ensure the reliability and economy of the offshore converter station structure type in practical engineering application.
Disclosure of Invention
The invention aims to solve the technical problems that:
1) The offshore converter station is integrally built and installed in a building site, so that butt joint buffer devices and working procedures such as LMU, DSU and the like are omitted, and a floating method and relevant ship machine equipment are avoided.
2) The limit of the structure to the site soil and rock stratum conditions is avoided, and the application range of development is enlarged.
3) The gravity center height of the offshore converter station structure is reduced, the plane size is reduced, and the bearing performance of the structure under the power working condition of the marine environment is improved.
4) Different from the conventional semi-submersible ocean platform, the special structural arrangement (ballasting) and anchoring system design can be used for purposefully buffering the rolling, pitching and heaving motions of the offshore converter station, and effectively controlling the inclination deformation of each electrical device and the inertial acceleration input of the basic position, so that the normal use performance is not affected.
The technical scheme adopted by the invention is as follows:
A deep draft semi-submersible offshore converter station characterized by: the deep-draft semi-submersible type offshore converter station comprises an upper assembly block, four supporting columns, a bypass space, a lower floating body and a mooring system, wherein the supporting columns are connected with the adjacent supporting columns through the bypass space, the supporting columns are used for supporting the upper assembly block upwards, the lower floating body is connected below the supporting columns and used for adjusting the draft of the deep-draft semi-submersible type offshore converter station, and the mooring system is used for positioning and fixing the deep-draft semi-submersible type offshore converter station; the upper assembly is always above the sea surface, and the support column part, the lower floating body and the mooring line anchoring system are all below the sea surface.
The invention can also adopt or combine the following technical proposal when adopting the technical proposal:
As a preferable technical scheme of the invention: the upper assembly is a single-layer steel structure factory building, the two direction dimensions of the horizontal plane are almost identical, the western side is a converter valve hall, the eastern side is a direct current chamber, the equipment is arranged in a north-south symmetry manner, and an equipment carrying area is arranged.
As a preferable technical scheme of the invention: the support columns are symmetrically located at four corners of a horizontal plane of the deep draft semi-submersible type offshore converter station, each support column is a square cylinder space surrounded by a steel plate structure, cables, pipeline wells and elevator shafts are reserved in four corners of the square cylinder space, and five layers are formed in the square cylinder space from top to bottom: (1) The first layer is a connection conversion layer, no equipment room is arranged except for cables and pipelines which are necessary for up and down communication, and a plurality of vertical structural dampers are arranged at the plane edge and used for buffering the heave inertia effect of the deep-draft semi-submersible offshore converter station received by the upper assembly block; (2) The second layer is a cooling equipment layer, space arrangement of southwest and northwest corners is used for replacing a flow valve cooling device, space arrangement of northeast corners is used for arranging a main transformer cooling device, and space arrangement of southeast corners is used for arranging a seawater pump house and water treatment equipment; (3) The third layer is an electrical equipment layer, the cylinders on the four corners are connected with the adjacent supporting upright column cylinders through bypass spaces, the horizontal surfaces of the supporting upright column cylinders and the bypass spaces of the layer are 2 times as high as those of other layers, a moon pool can be formed, a water body enclosed by the layer structure is utilized to form a buffer effect on horizontal inertial load, two main transformers are arranged in the center of the east side bypass and the north side bypass, two GIS and secondary alternating current equipment chambers are arranged in the west side bypass and the corner spaces, storage batteries and emergency distribution centers are arranged in the corner spaces of the north side bypass and the south side bypass, a public alternating current secondary chamber and a central control chamber are arranged in the south side, and hoisting and equipment carrying areas are arranged at positions of the main transformers and the GIS; (4) The fourth layer is a power layer, and three diesel generators and station power centers are respectively arranged in four corner spaces; (5) The fifth layer is a heating ventilation layer, a water supply layer and a water drainage layer, and a water pump room and a heating ventilation machine room are respectively arranged in the four corner spaces.
As a preferable technical scheme of the invention: the horizontal surface of the lower floating body is in a shape of a Chinese character 'hui' or a Chinese character 'jing', a plurality of separated ballast water tanks are arranged in the lower floating body and are used for adjusting the draft of the platform, and mooring and positioning control chambers are arranged in four corner spaces.
As a preferable technical scheme of the invention: the mooring rope anchoring system consists of an anchor machine, a cable guider, anchor chains and an anchor body, and is respectively arranged at four corners of a lower floating body of the deep-draft semi-submersible type offshore converter station, 3 anchor chains are arranged at each corner, and are arranged in a 4 multiplied by 3 mode, so that the permanent anchoring requirement of the deep-draft semi-submersible type offshore converter station is met; the anchor machine has the function of adjusting the length of an anchor chain, and provides different positioning performances under different service conditions; the direction of the anchor chain is adjusted through the cable guide device, and the load born by the converter station is transferred to an anchor body arranged on the seabed; the anchor body is pre-installed in the engineering sea area, and a grabbing anchor, a suction anchor, a pile foundation or a gravity anchor can be selected according to the situation of the site.
As a preferable technical scheme of the invention: the method comprises the steps of completing manufacturing, installing and equipment debugging of each main body part in a construction base, and carrying out anchoring positioning and submarine cable access by towing and transporting to a service site by a tug after completing, wherein each main body part comprises an upper assembly, four supporting upright posts, a bypass space, a lower floating body and a mooring rope anchoring system.
As a preferable technical scheme of the invention: the draft of the deep draft semi-submersible offshore converter station can be adjusted according to different conditions: in normal operation, the change of sea level is positioned in the range of the electric equipment layer in the supporting upright post, and all the layers below are positioned in the water surface and are always in a deep draft state; when equipment is overhauled, good weather conditions are selected, ballast water is reduced, so that an upright post electrical equipment layer can float out of the water surface, and equipment is carried through a hoisting platform; when the storm is in a self-storage state, ballast water is added, so that the electric equipment layers are all immersed below the water surface, and the overall stability of the platform is improved.
As a preferable technical scheme of the invention: the matched sea cables of the mooring rope anchoring system are connected into the upper assembly block through J-shaped pipes arranged on the inner side walls of the support upright post and the lower floating body in a reverse shape by adopting a dynamic design method; in the range of the electric equipment layer in the supporting upright post, necessary ship-backing facilities are arranged on the outer side wall of the U-shaped structure.
As a preferable technical scheme of the invention: the outer surfaces of all parts of the structure of the deep draft semi-submersible offshore converter station are subjected to corrosion prevention and seepage prevention design treatment.
The beneficial effects of the invention are as follows:
1) Besides dragging the ship, no special ship machine equipment or additional anti-collision butt joint buffer facilities are needed, the structural failure risk caused by floating support installation is avoided, the geological conditions of the service sites are not needed, the construction process is simple and easy, and the application range is wide;
2) The gravity center of the structure can meet the eccentric tolerance requirement in the horizontal plane, the height in the vertical direction is greatly reduced, the bearing capacity of the structure under the power working condition can be remarkably improved, and meanwhile, the most unfavorable anti-seismic problem of the fixed structure is avoided;
3) The structure can be repeatedly utilized, the position can be flexibly adjusted, and the operation of the factory returning transportation process after disaster or decommissioning is simple, and the offshore cutting is not needed.
Drawings
Fig. 1 is a three-dimensional schematic of the present invention.
Fig. 2 is a plan view of the upper block.
Fig. 3 is a plan view of a first layer of support columns.
Fig. 4 is a plan view of a second layer of support columns.
FIG. 5 is a plan view of a third layer of support posts and bypass space.
Fig. 6 is a plan view of a fourth layer of support columns.
Fig. 7 is a plan view of the fifth layer of support posts.
Fig. 8 is a plan view of the lower floating body.
Figure 9 is a partial view of the connection location of the lower buoy to the mooring line anchor system.
Detailed Description
To further illustrate the present disclosure, features and efficacy, an embodiment is set forth below along with the accompanying figures.
(1) As shown in fig. 1, this embodiment includes the following components: 1-upper block, 2-connection conversion layer, 3-cooling equipment layer, 4-electrical equipment layer, 5-power layer, 6-heating ventilation and water supply and drainage layer, 7-lower floating body, 8-mooring anchor system. In this embodiment, the plane size is 90 m' 70 m, the total height is 61 m, the height of the upper assembly 1 is 18m, the height of the connection conversion layer 2 is 3 m, the height of the cooling device layer 3 is 6m, the height of the electrical device layer 4 is 12 m, the heights of the power layer 5, the heating ventilation layer and the water supply and drainage layer 6 are 6m, the height of the lower floating body 7 is 10m, the average sea level is located between the connection conversion layer 2 and the cooling device layer 3, and the corner positions of all areas are transited by adopting circular arcs with the radius of 3 m, so that the hydrodynamic performance is improved. Each partition is built on a wharf base, assembled and debugged on the wharf base, and then is towed and transported to a service site (the water depth is 40-50 m) by a tugboat after the completion, and is positioned and anchored by four groups of mooring anchor systems 8 connected below the lower floating body 7, and finally, sea cables are connected to put the converter station into production operation. In the present embodiment, the moon pool 100 is formed between the electric equipment layer 4 and the lower floating body 7, so that the response of the whole converter station in the horizontal direction is reduced, and the buffer function of the horizontal inertial load is achieved.
(2) As shown in fig. 2: north-south symmetrical converter valve halls 11a and 11b are arranged on the west side of the upper block 1; north-south symmetric DC chambers 12a and 12b are arranged on the east side; an equipment lifting and carrying area 13 is arranged above the direct current chamber; at the four corners, an elevator shaft 9a and a cable shaft 10a are arranged, which ensure a vertical penetration.
(3) As shown in fig. 3: the connection conversion layer 2 is respectively positioned at four corners, and corresponding elevator shafts 9b and cable shafts 10b are arranged at positions corresponding to the elevator shaft 9a and the cable shaft 10a at the upper layer; at each connection conversion layer 2, 8 vertical structural dampers 21 are arranged for damping the heave inertia of the platform to which the upper block 1 is subjected.
(4) As shown in fig. 4: the cooling equipment layer 3 and the connection conversion layer 2 are arranged in the supporting column space, also at four corners, through which the elevator shaft 9c and the cable shaft 10c are penetrated. The north-west and south-west corners are provided with a converter valve cooling chamber 31 in which a converter valve cooling device is arranged; a main transformer cooling chamber 32 is disposed in the northeast corner, in which a main transformer cooling device is disposed; the southeast corner is provided with a seawater pump house 33, in which the seawater pump house and the water treatment equipment are arranged.
(5) As shown in fig. 5: the electrical equipment floor 4 is a bypass space, an inspection worker enters from the elevator shaft 9d, and a cable enters from the cable shaft 10 d. 252kVGIS chambers 41 and 550kVGIS chambers 42 are arranged in the bypass space on the west side of the electrical equipment layer 4; a power distribution room 43, an emergency power distribution center 44 and a storage battery chamber 45 are arranged at the position close to the upright post on the north side, and the three rooms are arranged from north to south; a main transformer room 46 is arranged on each of the north side and the east side, and a switch cabinet and a station transformer room 47 are arranged between the main transformer rooms (northeast corner); 6 storage battery chambers 45, a secondary alternating current equipment chamber 48 and a central control chamber 49 are sequentially arranged from west to east on the south side, and a hoisting and equipment carrying area 40 is arranged at the position of the main transformer and the GIS. The central area of the electrical equipment layer 4 forms a moon pool 100 to reduce the horizontal power response of the converter station.
(6) As shown in fig. 6: the power floor 5 is identical to the arrangement of the electrical equipment floor 4, with the elevator shaft 9e and the cable shaft 10e being arranged at corresponding positions, the diesel engine room 51 being arranged at the northeast, southwest and northwest corners, and the converter station power center room 52 being arranged at the southwest corner.
(7) As shown in fig. 7: the heating and ventilation and water supply and drainage layer 6 and the power layer 5 are arranged in the space of the supporting upright post, the layer is communicated with the power layer 5 through an elevator shaft 9f and a cable shaft 10f, a heating and ventilation machine room 61 is arranged at the northwest corner and the southeast corner, and a fire pump room 62 is arranged at the southwest corner and the northeast corner.
(8) As shown in fig. 8 and 9: the lower floating body 7 is provided with ballast water tanks 71 except for four corners, each of which is provided with a mooring control chamber 72, and each mooring control chamber 72 is internally provided with 3 anchor chains which are arranged in a 4 multiplied by 3 way; 8 are composed of an anchor chain 81, an anchor body 82, an anchor machine 83 and a cable guide 84. The anchor machines 83 arranged at four corners on the lower floating body 7 can adjust the positioning performance of the floating type converter station by adjusting the length of the anchor chains 81 and the direction of the cable guides 84, and tighten the anchor chains 81 under the normal working condition to limit the movement amplitude of the converter station; and under the extreme survival working condition, the anchor chain 81 is loosened, the tension applied to the anchor chain 81 is reduced, and the anchor chain 81 is ensured not to break and the anchor body 82 is ensured not to be anchored.
(9) The submarine cables in the embodiment are all dynamically designed, and are connected into the upper assembly 1 through J-shaped pipes arranged on the inner side wall of the Chinese character 'Hui' shape between the connection conversion layer 2 and the lower floating body 7; in the elevation range of the electric equipment layer 4, necessary boarding facilities are provided on the outer side walls of the zigzag shape.
(10) In this embodiment, the outer surfaces of the parts of the structures from the upper block 1 to the lower floating body 7 are all subjected to corrosion-resistant and seepage-resistant design treatment.
The above embodiment is only one preferred technical solution of the present invention, and it should be understood by those skilled in the art that modifications and substitutions can be made to the technical solution or parameters in the embodiment without departing from the principle and essence of the present invention, and all the modifications and substitutions are covered in the protection scope of the present invention.
Claims (6)
1. A deep draft semi-submersible offshore converter station characterized by: the deep-draft semi-submersible type offshore converter station comprises an upper assembly block, four supporting columns, a bypass space, a lower floating body and a mooring system, wherein the supporting columns are connected with the adjacent supporting columns through the bypass space, the supporting columns are used for supporting the upper assembly block upwards, the lower floating body is connected below the supporting columns and used for adjusting the draft of the deep-draft semi-submersible type offshore converter station, and the mooring system is used for positioning and fixing the deep-draft semi-submersible type offshore converter station; the upper assembly is always above the sea surface, and the supporting upright post part, the lower floating body and the mooring rope anchoring system are all below the sea surface;
The upper assembly is a single-layer steel structure factory building, the two direction dimensions of the horizontal plane are almost identical, the western side is a converter valve hall, the eastern side is a direct current chamber, the equipment is symmetrically arranged in the north-south direction, and an equipment carrying area is arranged;
The support columns are symmetrically located at four corners of a horizontal plane of the deep draft semi-submersible type offshore converter station, each support column is a square cylinder space surrounded by a steel plate structure, cables, pipeline wells and elevator shafts are reserved in four corners of the square cylinder space, and five layers are formed in the square cylinder space from top to bottom: (1) The first layer is a connection conversion layer, no equipment room is arranged except for cables and pipelines which are necessary for up and down communication, and a plurality of vertical structural dampers are arranged at the plane edge and used for buffering the heave inertia effect of the deep-draft semi-submersible offshore converter station received by the upper assembly block; (2) The second layer is a cooling equipment layer, space arrangement of southwest and northwest corners is used for replacing a flow valve cooling device, space arrangement of northeast corners is used for arranging a main transformer cooling device, and space arrangement of southeast corners is used for arranging a seawater pump house and water treatment equipment; (3) The third layer is an electrical equipment layer, the cylinders on the four corners are connected with the adjacent supporting upright column cylinders through bypass spaces, the horizontal surfaces are in a shape like a Chinese character 'hui', the height of the supporting upright column cylinders and the bypass space of the layer is 2 times that of the other layers, a moon pool can be formed, the water body enclosed by the layer structure is utilized to form a buffer effect on horizontal inertial load, two main transformers are arranged in the center of the east side bypass and the north side bypass, two GIS and secondary alternating current equipment chambers are arranged in the west side bypass and the corner spaces, storage batteries and emergency distribution centers are arranged in the corner spaces of the north side bypass and the south side bypass, a public alternating current secondary chamber and a central control chamber are arranged in the south side, and hoisting and equipment carrying areas are arranged at the positions of the main transformers and the GIS; (4) The fourth layer is a power layer, and three diesel generators and station power centers are respectively arranged in four corner spaces; (5) The fifth layer is a heating ventilation and water supply and drainage layer, and a water pump room and a heating ventilation machine room are respectively arranged in the four corner spaces;
The horizontal surface of the lower floating body is in a reverse shape or a cross shape, a plurality of separated ballast water tanks are arranged in the lower floating body and used for adjusting the draft of the platform, and mooring and positioning control chambers are arranged in four corner spaces.
2. The deep draft semi-submersible offshore converter station of claim 1 wherein: the mooring rope anchoring system consists of an anchor machine, a cable guider, anchor chains and an anchor body, and is respectively arranged at four corners of a lower floating body of the deep-draft semi-submersible type offshore converter station, 3 anchor chains are arranged at each corner, and are arranged in a4 multiplied by 3 mode, so that the permanent anchoring requirement of the deep-draft semi-submersible type offshore converter station is met; the anchor machine has the function of adjusting the length of an anchor chain, and provides different positioning performances under different service conditions; the direction of the anchor chain is adjusted through the cable guide device, and the load born by the converter station is transferred to an anchor body arranged on the seabed; the anchor body is pre-installed in the engineering sea area, and a grabbing anchor, a suction anchor, a pile foundation or a gravity anchor can be selected according to the situation of the site.
3. The deep draft semi-submersible offshore converter station of claim 1 wherein: the method comprises the steps of completing manufacturing, installing and equipment debugging of each main body part in a construction base, and carrying out anchoring positioning and submarine cable access by towing and transporting to a service site by a tug after completing, wherein each main body part comprises an upper assembly, four supporting upright posts, a bypass space, a lower floating body and a mooring rope anchoring system.
4. The deep draft semi-submersible offshore converter station of claim 1 wherein: the draft of the deep draft semi-submersible offshore converter station can be adjusted according to different conditions: in normal operation, the change of sea level is positioned in the range of the electric equipment layer in the supporting upright post, and all the layers below are positioned in the water surface and are always in a deep draft state; when equipment is overhauled, good weather conditions are selected, ballast water is reduced, so that an upright post electrical equipment layer can float out of the water surface, and equipment is carried through a hoisting platform; when the storm is in a self-storage state, ballast water is added, so that the electric equipment layers are all immersed below the water surface, and the overall stability of the platform is improved.
5. The deep draft semi-submersible offshore converter station of claim 1 wherein: the matched sea cables of the mooring rope anchoring system are connected into the upper assembly block through J-shaped pipes arranged on the inner side walls of the back-shaped supporting upright posts and the lower floating body by adopting a dynamic design method; in the range of the electric equipment layer in the supporting upright post, necessary ship backing facilities are arranged on the outer side wall of the U-shaped structure.
6. The deep draft semi-submersible offshore converter station of claim 1 wherein: the outer surfaces of all parts of the structure of the deep draft semi-submersible offshore converter station are subjected to corrosion prevention and seepage prevention design treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911119018.2A CN110844012B (en) | 2019-11-15 | 2019-11-15 | Deep draft semi-submersible offshore converter station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911119018.2A CN110844012B (en) | 2019-11-15 | 2019-11-15 | Deep draft semi-submersible offshore converter station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110844012A CN110844012A (en) | 2020-02-28 |
| CN110844012B true CN110844012B (en) | 2024-08-06 |
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| CN211468719U (en) * | 2019-11-15 | 2020-09-11 | 中国电建集团华东勘测设计研究院有限公司 | Deep draft semi-submersible type offshore converter station |
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| AU3872099A (en) * | 1998-05-01 | 1999-11-23 | Friede & Goldman, Ltd. | Dynamically positioned semi-submersible drilling vessel |
| CN201647096U (en) * | 2010-03-30 | 2010-11-24 | 中国海洋石油总公司 | Modular platform for deep draft truss column |
| MY187310A (en) * | 2010-04-26 | 2021-09-21 | Aker Solutions Inc | Dry-tree semi-submersible production and drilling unit |
| CN204415681U (en) * | 2014-11-24 | 2015-06-24 | 新疆金风科技股份有限公司 | Semi-submersible lng floating blower foundation and floating blower fan |
| CN208882060U (en) * | 2018-09-14 | 2019-05-21 | 深圳市海斯比浮岛科技开发有限公司 | A kind of multi fan offshore floating type wind power platform |
| CN110042819B (en) * | 2019-04-16 | 2021-06-01 | 中国电建集团华东勘测设计研究院有限公司 | Offshore converter station for flexible direct current transmission system |
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