Tension leg floating type fan installation method and device

Abstract

The invention discloses a tension leg floating type draught fan installation method and device. The method comprises the steps that a mooring anchor is installed to the preset depth of a seabed; the tension leg floating type draught fan is towed to the center position where the mooring anchor is located; the tugs enter the parking lot to reach the parking space; a deck winch on the tug is connected with an anchor chain, the floating body is connected with an anchor cable, the anchor cable penetrates through a transition ring on the mooring anchor, and the anchor chain passes through a chain stopper and is connected with the anchor cable; the tug drags the anchor chain back on to the floating body, and synchronously cooperates with ballast water to a ballast tank of the floating body to level the levelness of the floating body; when the floating body reaches the preset draft depth, dragging is stopped, and the anchor chain is fixed by the chain stopper; a floating body inclination sensor measures whether the inclination degree of the platform meets the requirement or not, if the design requirement is met, a floating body ballast tank drains water, and tension in an anchor chain and an anchor cable is monitored to reach a preset value through a tension sensor; and installation is completed, and the tug is removed. The installation of the tension leg floating type fan can be rapidly completed, the installation is convenient and fast, the cost is low, and batch installation of the tension leg floating type fan can be rapidly carried out.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore floating wind turbines, and particularly relates to an installation method and device for a tension leg floating wind turbine. Background Art

[0002] With the gradual development of offshore wind power towards the deep and far sea, the sea conditions are more complex. The tension leg floating wind turbine has good motion performance, good stability, is less affected by the environment, and has a small motion amplitude at sea, which can better ensure the power generation of the wind turbine. At present, only a small number of tension leg floating prototypes are in operation. If the installation experience of traditional tension leg oil and gas platforms is adopted, not only is the offshore operation difficult, requiring a lot of auxiliary facilities and complex processes, but also there are greater installation risks and high installation costs, making it difficult to adapt to the mass installation of tension leg floating wind turbines, with high costs, thus hindering the popularization and application of tension leg floating wind turbines. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and propose an installation method and device for a tension leg floating wind turbine. Through conventional marine machinery and equipment, the installation of the tension leg floating wind turbine can be quickly completed, with convenient installation, easy access to installation resources, and relatively low installation costs, enabling the mass installation of tension leg floating wind turbines to be carried out quickly.

[0004] The purpose of the present invention is achieved through the following technical solutions: An installation method for a tension leg floating wind turbine, which realizes the installation of the tension leg floating wind turbine through a tension leg floating wind turbine installation device. The tension leg floating wind turbine installation device includes a floating body, a chain stopper, a mooring anchor, a transition ring, a tugboat, an anchor chain, an anchor cable, a transition ring, and a tension sensor. The floating body is provided with a ballast tank and an inclination sensor. The floating body is installed at the bottom of the tension leg floating wind turbine through flange bolts, and the cross-section of the floating body is radially multi-ended, with a chain stopper provided at each end. The mooring anchor is installed on the seabed and corresponds to each end of the floating body. A transition ring is provided on the mooring anchor. A deck winch is provided on the tugboat. One end of the anchor chain is connected to the deck winch of the tugboat, and the other end of the anchor chain is connected to one end of the anchor cable through the chain stopper. The other end of the anchor cable is connected to the floating body after passing through the transition ring on the mooring anchor, and a tension sensor is provided on each anchor chain. The method includes the following steps: S1. The mooring anchor installation ship and the suction pump skid enter the site, and the mooring anchor is installed to a preset depth on the seabed through the negative pressure inside and outside the suction cylinder. S2. The tension leg floating wind turbine is towed to the central position where the mooring anchor is located. S3. The tugboat enters the site and arrives near the machine position. S4. The deck winch on the tugboat connects the anchor chain, the floating body is connected to the anchor cable, the anchor cable passes through the transition ring on the mooring anchor, and the anchor chain passes through the chain stopper and is connected to the anchor cable. S5. The tugboat pulls the anchor chain away from the floating body, and simultaneously coordinates with the ballast water to the ballast tank of the floating body. The tilt sensor preset in the floating body monitors the tilt of the platform and levels the floating body at any time; S6. Make the floating body reach the predetermined draft depth, stop pulling, and temporarily fix the anchor chain with the chain stopper of the floating body; S7. The tilt sensor of the floating body measures whether the tilt of the platform meets the requirements. If it meets the design requirements, the ballast tank of the floating body drains water to make the floating body float, and the tension sensor monitors to make the tension in the anchor chain and anchor cable reach the predetermined value; if it does not meet the requirements, unfasten the chain stopper, and use the deck winch on the tugboat to slightly adjust the length of the anchor chain, so as to level the floating body; after meeting the design requirements, the chain stopper of the floating body fixes the anchor chain, the ballast tank of the floating body drains water to make the floating body float, and the tension sensor monitors to make the tension in the anchor chain and anchor cable reach the predetermined value; S9. Disconnect the anchor chain connected to the tugboat winch, complete the installation, and the tugboat withdraws from the site.

[0005] Furthermore, the cross-section of the floating body is radially arranged at three ends.

[0006] Furthermore, the bottom of the floating body is divided into at least 2 ballast tanks by bulkheads.

[0007] Furthermore, the chain stopper is installed on the side column of the floating body.

[0008] Furthermore, the mooring anchor is a suction anchor.

[0009] A tension leg floating wind turbine installation device for the above-mentioned tension leg floating wind turbine installation method. The device includes: a floating body, a chain stopper, a mooring anchor, a transition ring, a tugboat, an anchor chain, an anchor cable, a transition ring and a tension sensor. The floating body is preset with a ballast tank and a tilt sensor. The floating body is installed at the bottom of the tension leg floating wind turbine through flange bolts, and the cross-section of the floating body is radially arranged at multiple ends, and each end is provided with a chain stopper. The mooring anchor is installed on the seabed and corresponds to each end of the floating body. A transition ring is provided on the mooring anchor. A deck winch is provided on the tugboat. One end of the anchor chain is connected to the deck winch of the tugboat, the other end of the anchor chain is connected to one end of the anchor cable through the chain stopper, and the other end of the anchor cable is connected to the floating body after passing through the transition ring on the mooring anchor. A tension sensor is provided on each anchor chain.

[0010] Furthermore, the cross-section of the floating body is radially arranged at three ends.

[0011] Furthermore, the number of ballast tanks is at least 2.

[0012] Furthermore, the chain stopper is installed on the side column of the floating body.

[0013] Furthermore, the mooring anchor is a suction anchor.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: (1) The traditional tension leg oil and gas platform mooring system uses expensive ribs and connectors, which are expensive and the technology is immature. The present invention uses an anchor chain plus anchor cable mooring system, which significantly reduces the cost; (2) Compared with the traditional tension leg oil and gas platform, which has many installation procedures, complex offshore operations, high reliance on environmental window periods, and high costs, the present invention has the advantages of simple installation procedures, low requirements for ship and machinery resources, and low costs, and is suitable for the installation of batch floating offshore wind farms; (3) The installation of traditional tension leg oil and gas platforms generally requires the installation of ribs by crane ships, which is very expensive. The present invention does not require large crane ships, but only requires conventional and readily available tugboats to meet the installation requirements. (4) After the traditional tension leg oil and gas platform installs the ribs on the crane ship, a temporary buoyancy box will be installed on the ribs, which requires a lot of procedures. The present invention does not require a buoyancy box and does not require the installation of ribs in advance. (5) When installing the float to the rib key on a conventional tension leg oil and gas platform, a floating crane is generally required to assist in connecting the float rib key opening and the rib key, which is highly dependent on the ship and marine environmental conditions, requires high installation accuracy, and is difficult. The present invention does not require the use of a crane, and the rib key installation can be completed in one go. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Flow chart of the installation method of tension leg floating wind turbine.

[0016] Figure 2 This is a structural side view of the tension-leg floating wind turbine installation device.

[0017] Figure 3 This is a top view of the structure of the tension-leg floating wind turbine installation method.

[0018] Figure 4 Schematic diagram of the structure of the tension-leg floating wind turbine after installation. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific embodiments.

[0020] Example 1 See also Figures 1 to 4As shown in the figure, the method for installing a tension leg floating wind turbine provided in this embodiment realizes the installation of the tension leg floating wind turbine through a tension leg floating wind turbine installation device. The tension leg floating wind turbine installation device includes a floating body 1, a chain stopper 2, a mooring anchor 3, a transition ring 4, a tugboat 5, an anchor chain 6, an anchor cable 7, a transition ring 8, and a tension sensor 9. The floating body 1 is preset with a ballast tank 101 and an inclination sensor. The floating body 1 is installed at the bottom of the tension leg floating wind turbine 10 through flange bolts, and the cross-section of the floating body 1 is radially arranged at three ends, and a chain stopper 2 is provided at each end. The mooring anchor 3 is installed on the seabed and corresponds to each end of the floating body 1. A transition ring 4 is provided on the mooring anchor 3. A deck winch 501 is provided on the tugboat 5. One end of the anchor chain 6 is connected to the deck winch of the tugboat 5, and the other end of the anchor chain 6 is connected to one end of the anchor cable 7 through the chain stopper 2. The other end of the anchor cable 7 is connected to the floating body 1 after passing through the transition ring 4 on the mooring anchor 3. A tension sensor 11 is provided on each anchor chain 6. The method includes the following steps: S1. The mooring anchor installation ship and the suction pump skid enter the site, and the mooring anchor is installed to a preset depth on the seabed through the negative pressure inside and outside the suction cylinder. S2. The tension leg floating wind turbine is towed to the central position where the three mooring anchors are located. S3. Three tugboats enter the site and arrive near the machine position. S4. The deck winch on the tugboat is connected to the anchor chain, the anchor cable is connected to the floating body, the anchor cable passes through the transition ring on the mooring anchor, and the anchor chain passes through the chain stopper and is connected to the anchor cable. S5. The tugboat pulls the anchor chain away from the floating body, and at the same time, ballast water is pumped into the ballast tank of the floating body. The inclination sensor preset in the floating body monitors the inclination of the platform and levels the floating body at any time. S6. The floating body reaches the predetermined draft depth, stops pulling, and the chain stopper of the floating body temporarily fixes the anchor chain. S7. The inclination sensor of the floating body measures whether the inclination of the platform meets the requirements. If it meets the design requirements, the ballast tank of the floating body is drained to make the floating body float, and the tension sensor is used to monitor the tension in the anchor chain and the anchor cable to the predetermined value. If it does not meet the requirements, the chain stopper is released, and the length of the anchor chain is adjusted slightly by using the deck winch on the tugboat to level the floating body. After meeting the design requirements, the chain stopper of the floating body fixes the anchor chain, the ballast tank of the floating body is drained to make the floating body float, and the tension sensor is used to monitor the tension in the anchor chain and the anchor cable to the predetermined value. S9. The anchor chain connected to the tugboat winch is disconnected to complete the installation, and the tugboat withdraws from the site.

[0021] Embodiment 2 See Figure 2As shown in the figure, the tension leg floating wind turbine installation device provided in this embodiment is used to implement the tension leg floating wind turbine installation method described in Embodiment 1. The device includes: a floating body 1, a chain stopper 2, a mooring anchor 3, a transition ring 4, a tugboat 5, an anchor chain 6, an anchor cable 7, a transition ring 8, and a tension sensor 9. The floating body 1 is preset with 5 ballast tanks 101 and tilt sensors. The floating body 1 is installed at the bottom of the tension leg floating wind turbine 10 through flange bolts, and the cross-section of the floating body 1 is radially arranged at three ends, and a chain stopper 2 is provided at each end. The installation position of the chain stopper 2 is on the side column of the floating body 1. The mooring anchor 3 is installed on the seabed and corresponds to each end of the floating body 1. The mooring anchor 3 is a suction anchor. A transition ring 4 is provided on the mooring anchor 3. A deck winch is provided on the tugboat 5. One end of the anchor chain 6 is connected to the deck winch 501 of the tugboat 5, and the other end of the anchor chain 6 is connected to one end of the anchor cable 7 through the chain stopper 2. The other end of the anchor cable 7 is connected to the floating body 1 after passing through the transition ring 4 on the mooring anchor 3. A tension sensor 11 is provided on each anchor chain 6.

[0022] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for installing a tension leg floating wind turbine, characterized in that: The method realizes the installation of a tension leg floating wind turbine by a tension leg floating wind turbine installation device, wherein the tension leg floating wind turbine installation device comprises a buoy, a chain stopper, a mooring anchor, a transition ring, a tugboat, an anchor chain, an anchor cable, a transition ring and a tension sensor, wherein the buoy is preset with a ballast tank and a tilt sensor, the buoy is installed at the bottom of the tension leg floating wind turbine by flange bolts, and the cross section of the buoy is multi-end radial, each end of which is provided with a chain stopper, the mooring anchor is installed on the seabed and corresponds to each end of the buoy, the mooring anchor is provided with a transition ring, the tugboat is provided with a deck winch, one end of the anchor chain is connected to the deck winch of the tugboat, the other end of the anchor chain is connected to one end of the anchor cable through the chain stopper, the other end of the anchor cable is connected to the buoy after passing through the transition ring on the mooring anchor, and each anchor chain is provided with a tension sensor; the method comprises the following steps: S1. The mooring anchor installation vessel and the suction pump skid enter the site and install the mooring anchor to the preset depth of the seabed through the negative pressure inside and outside the suction cylinder; S2, the tension leg floating wind turbine is towed to the center of the mooring anchor; S3, tugboat approaches and arrives near the aircraft position; S4. The deck winch on the tugboat is connected to the anchor chain, the floating body is connected to the anchor cable, the anchor cable passes through the transition ring on the mooring anchor, the anchor chain passes through the chain stopper and is connected to the anchor cable; S5. The tugboat drags the anchor chain away from the buoy and simultaneously delivers ballast water to the ballast tank of the buoy. The tilt sensor pre-installed in the buoy monitors the inclination of the platform and adjusts the horizontality of the buoy at any time. S6, making the floating body reach a predetermined draft, stopping the towing, and making the chain stopper of the floating body temporarily fix the anchor chain; S7. The floating body inclination sensor measures whether the inclination of the platform meets the requirements. If it meets the design requirements, the floating body ballast tank is drained to make the floating body float up, and the tension in the anchor chain and anchor cable is monitored to a predetermined value through the tension sensor; if it does not meet the requirements, the chain stopper is untied, and the length of the anchor chain is fine-tuned by the winch on the deck of the tugboat to level the floating body; after the design requirements are met, the floating body chain stopper fixes the anchor chain, the floating body ballast tank is drained to make the floating body float up, and the tension in the anchor chain and anchor cable is monitored to a predetermined value through the tension sensor; S9. Release the anchor chain connected to the tugboat winch, complete the installation, and the tugboat leaves the site.

2. A tension leg floating wind turbine installation method according to claim 1, characterized in that: The cross section of the floating body is three-end radial.

3. A method for installing a tension leg floating wind turbine according to claim 1, characterized in that: The bottom of the floating body is divided into at least two ballast tanks by using a tank bulkhead.

4. A method for installing a tension leg floating wind turbine according to claim 1, characterized in that: The chain stopper is installed on the side column of the floating body.

5. The method for installing a tension leg floating wind turbine according to claim 1, characterized in that: The mooring anchor is a suction anchor.

6. A tension leg floating wind turbine installation device, characterized in that: A method for installing a tension-leg floating wind turbine according to any one of claims 1 to 5, the device comprising: a float, a chain stopper, a mooring anchor, a transition ring, a tugboat, an anchor chain, an anchor cable, a transition ring and a tension sensor, the float being preset with a ballast tank and a tilt sensor, the float being mounted on the bottom of the tension-leg floating wind turbine by flange bolts, and the cross-section of the float being multi-end radial, each end of which being provided with a chain stopper, the mooring anchor being mounted on the seabed and corresponding to each end of the float, the mooring anchor being provided with a transition ring, the tugboat being provided with a deck winch, one end of the anchor chain being connected to the deck winch of the tugboat, the other end of the anchor chain being connected to one end of the anchor cable through the chain stopper, the other end of the anchor cable being connected to the float after passing through the transition ring on the mooring anchor, and each anchor chain being provided with a tension sensor.

7. A tension leg floating wind turbine installation device according to claim 6, characterized in that: The cross section of the floating body is three-end radial.

8. The tension leg floating wind turbine installation device according to claim 6, characterized in that: The number of the ballast tanks is at least 2.

9. The tension leg floating wind turbine installation device according to claim 6, characterized in that: The chain stopper is installed on the side column of the floating body.

10. The tension leg floating wind turbine installation device according to claim 6, characterized in that: The mooring anchor is a suction anchor.

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