Wave energy device combined with inner turret type single-point mooring system

Abstract

The invention discloses a wave energy device combined with an internal turret type single-point mooring system, which comprises a rear bent pipe wave energy power generation device and the internal turret type single-point mooring system, wherein a rotary joint in the internal turret type single-point mooring system is detachably mounted at the bottom of the rear bent pipe wave energy power generation device; the rear elbow pipe is located below the gravity center of the rear elbow pipe wave energy power generation device; an inner turret in the inner turret type single-point mooring system is hollow and is divided into a plurality of cabins, and ballast water pumps are arranged at the bottoms of the cabins. The rotating joint is fixedly mounted below the gravity center position, and the inner side of the rotating joint is connected with the inner rotating tower, so that swaying, surging and rolling motions, irrelevant to power generation, of the wave energy power generation device under the action of an environmental load are reduced, and meanwhile, the pitching and heaving motions relevant to power generation cannot be influenced; by means of the adjustable ballast water inner turret type single point mooring system, the rear bent pipe wave energy power generation device can be controlled to keep good power generation efficiency under different sea conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of ocean wind power, and specifically to a wave energy device combined with an internal turret single point mooring system. Background Art

[0002] Due to the huge reserves of ocean wave energy resources and broad development prospects, the use of wave energy for power generation has received extensive attention from researchers in recent years. The working principles of common wave energy power generation devices mainly include oscillating buoy type, oscillating water column type, overtopping type, etc.

[0003] Among them, the rear elbow pipe technology, as one of the mainstream technologies of the oscillating water column type in recent years, has a good capture width ratio. It can capture wave energy under the action of waves, obtain mechanical energy by its own rolling motion, and convert mechanical energy into electrical energy by pipelines, air chambers, turbines, etc. During the power generation process of the rear elbow pipe wave energy power generation device, the pitching and heaving motions in the wave frequency motion have a greater impact on the power generation efficiency, while the rolling motion and the surge, sway, and yaw motions in the low-frequency slow drift motion have a smaller impact on the power generation efficiency of the device. Among them, the rolling motion is mainly caused by the component of the wave force in the ship width direction of the device, and the surge and sway motions will affect the safety of the device and the transmission cable below.

[0004] The wave energy power generation device uses multi-point mooring, and the maximum displacement of the device is relatively safe. However, due to the motion limitation of the multi-point mooring on the device, the power generation efficiency of the device will be affected more seriously; at the same time, under the multi-point mooring state, the device basically will not rotate greatly and can only generate electricity effectively in a specified direction.

[0005] Single-point mooring: Compared with multi-point mooring, single-point mooring has less motion limitation on the device and will not affect the power generation efficiency. When using a single mooring cable for mooring, the device can effectively adjust its direction and absorb wave energy from all directions. However, during the turning process of the device, not only the bow direction rotates, but also the device will generate large surge or sway motions, and the turning time is relatively long. The large surge or sway motions will also cause the tension of the device mooring system to be too large, resulting in the mooring line breaking in a dangerous state.

[0006] For example, the patent publication number CN106382180A "Floating buoyancy pendulum wave energy power generation device" includes a buoyancy pendulum wave energy power generation device main body, a floating foundation, and a mooring system. By injecting and pumping water into each ballast tank, the floating foundation is raised and lowered in the water, and the fixed ballast tank is used to adjust the weight and center of gravity of the floating foundation; the mooring system adopts a multi-point mooring method; Since the characteristic of the rear elbow pipe wave energy power generation device is that the height of the liquid column in the air chamber changes through pitching and heaving motions, and the bow floats up and down with the waves, the change of the center of gravity will affect the power generation efficiency of the rear elbow pipe wave energy power generation device. Summary of the Invention

[0007] The object of the present invention is to provide a wave energy device combined with an internal turret single point mooring system to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: A wave energy device combined with an internal turret single point mooring system, comprising a rear elbow wave energy power generation device and an internal turret single point mooring system: The rotary joint in the internal turret single point mooring system is detachably installed at the bottom of the rear elbow wave energy power generation device and is located below the center of gravity of the rear elbow wave energy power generation device; The inside of the internal turret in the internal turret single point mooring system is hollow and divided into multiple compartments, and a ballast water pump is provided at the bottom of the compartments.

[0009] Preferably, the center of gravity of the rear elbow wave energy power generation device is close to the bow side.

[0010] Preferably, the superstructure of the rear elbow wave energy power generation device is concentrated in the section from the center of gravity to the stern, and the wind load area in the section from the center of gravity to the stern is larger than the wind load area in the section from the center of gravity to the bow.

[0011] Preferably, power devices are provided on both the left and right sides of the stern of the rear elbow wave energy power generation device.

[0012] Preferably, it further comprises a data acquisition module and a data processing module; The data acquisition module is used to detect the surrounding sea condition information; The data processing module is used to process the obtained sea condition information to obtain a sea condition level; A risk warning module is used to compare the obtained sea condition level with a preset warning level threshold to determine whether to generate an alarm instruction.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The present invention fixedly installs a rotary joint below the center of gravity position. The inner side of the rotary joint is connected to the inner turret, and the rotary joint is clamped on the inner turret. Therefore, the device is restricted by the inner turret and will not undergo large heaving and swaying motions. At the same time, the wave energy power generation device is subjected to lateral environmental loads and can rotate around the rotary joint to adjust the orientation of the wave energy device to always keep the stern facing the wave direction, avoiding large rolling motions. After the orientation adjustment of the wave energy device is completed, the device undergoes pitching and heaving motions under the action of waves coming from the stern. The height of the water column in the pipe constantly changes, driving the change of the internal pressure of the air chamber, converting wave energy into electrical energy. During the rotation of the turbine, it drives the generator to rotate and generate electrical energy. Since the inner turret is located below the center of gravity position of the device, the center of gravity position remains unchanged, and the single-point mooring system will not affect the pitching and heaving motions of the wave energy device.

[0014] Through the above design, the swaying, heaving, and rolling motions unrelated to power generation of the wave energy power generation device under the action of environmental loads are reduced, and at the same time, the pitching and heaving motions related to power generation are not affected.

[0015] The inner turret type single-point mooring system with adjustable ballast water is beneficial to controlling the bended pipe wave energy power generation device to maintain a good power generation efficiency under different sea conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of the present invention.

[0018] The reference numerals in the drawings are represented as: 100, bended pipe wave energy power generation device; 101, power device; 200, inner turret type single-point mooring system; 201, rotary joint. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0020] Embodiment: A wave energy device combined with an inner turret type single-point mooring system, as shown in the attachedFigure 1 As shown in the figure, it includes a rear-bent pipe wave energy power generation device 100 and an internal turret single point mooring system 200; The rear-bent pipe wave energy power generation device 100 includes an L-shaped bent pipe, a floating chamber, an air chamber, an air turbine and a generator. The air chamber is connected to the upper end of the L-shaped bent pipe; the floating chamber is arranged at the stern and is located above the transverse part of the L-shaped bent pipe.

[0021] The interior of the floating chamber is divided into multiple independent compartments and is a hollow structure, ensuring the buoyancy of the compartments and preventing them from completely filling with water in the event of compartment damage.

[0022] The internal turret single point mooring system 200 includes an internal turret, a rotary joint 201, mooring cables and an anchor. The rotary joint 201 is detachably installed on the bottom wall of the rear-bent pipe wave energy power generation device 100, and the rotary joint 201 is arranged below the center of gravity of the rear-bent pipe wave energy power generation device 100. The rotary joint 201 is connected to the bottom wall of the rear-bent pipe wave energy power generation device 100 through a detachable slip ring or buckle. The rotary joint 201 is connected to the internal turret through bearings, ball bearings, etc., enabling the rotary joint 201 to rotate around the internal turret. Multiple mooring cables are connected below the internal turret, and the bottom of the mooring cables is directly connected to the seabed through an anchor. When subjected to environmental loads, the horizontal displacement of the internal turret is restricted under the action of multiple mooring cables.

[0023] The mooring cables can be selected as catenary, semi-taut or taut type, and the components of the mooring cables can be polyester cables, steel chains, steel cables, etc.

[0024] The interior of the internal turret is hollow and divided into multiple compartments. A ballast water pump is provided at the bottom of the compartments. The ballast water pump is a pump that can work bidirectionally, and can both suck seawater into the compartments and discharge seawater from the compartments; when the environment changes, the ballast water in the internal compartments of the internal turret can be adjusted through the ballast water pump, thereby adjusting the draft of the internal turret to ensure that the device can be ballasted and adjusted under working sea conditions; Compared with the ballast water of the rear-bent pipe itself, the internal turret installed below the center of gravity of the device can keep the center of gravity position of the rear-bent pipe unchanged; At the same time, the detachable internal turret single point mooring system 200 can be separated from the rear-bent pipe wave energy power generation device 100 under severe sea conditions, and the rear-bent pipe wave energy power generation device 100 is transferred to a safe location by a tugboat. At this time, the internal turret of the internal turret single point mooring system 200 can be filled with water or emptied of water to reduce the sway under severe sea conditions.

[0025] The rotary joint 201 is arranged directly below the center of gravity of the rear-bent pipe wave energy power generation device 100, which can facilitate the adjustment of the hull attitude and improve the conversion efficiency; under severe working conditions, the ballast water in the internal compartments of the internal turret can also be adjusted to reduce movement and displacement and prevent the internal turret from being damaged.

[0026] The center of gravity of the rear elbow wave energy power generation device 100 is set at one-third of the hull near the bow, and the superstructure is reasonably arranged, skillfully balancing the stability of the device and the energy capture efficiency. The superstructure is mainly concentrated in the section from the center of gravity to the stern, making the wind load area acting on this section significantly larger than that from the center of gravity to the bow. This unique center of gravity arrangement can not only effectively improve the wave-facing performance of the device, increase the wave force acting area, thereby enhancing the energy conversion efficiency, but also enhance the longitudinal stability of the device and reduce the impact of wind load on the device attitude.

[0027] On both sides of the stern of the rear elbow wave energy power generation device 100, multiple power devices 101 are respectively configured to form a left-right symmetric power layout. The power device 101 has an intelligent control function and can automatically select and start the optimal combination of power devices 101 according to real-time environmental conditions (such as wind and waves, sea currents, etc.) and the device turning trend to achieve precise control of the ship's direction. Even in calm waters, the system can also generate sufficient torque by coordinating the outputs of each power device to ensure that the rear elbow wave energy power generation device 100 completes a turn within half an hour.

[0028] Power devices 101 are installed below the left and right sides of the bow of the rear elbow wave energy power generation device 100. The power device 101 can be a propeller that can provide lateral force to assist the rear elbow wave energy power generation device 100 in lateral rotation. A wind direction sensor can also be installed on the rear elbow wave energy power generation device 100, and the wind direction sensor and the power device 101 cooperate to quickly adjust the device orientation.

[0029] The external shape design of the rear elbow wave energy power generation device 100 should ensure that it can quickly adjust the device orientation under the action of lateral environmental loads. Therefore, the position of the inner turret should be best set near the center of gravity position to facilitate the device turning; the center of gravity of the rear elbow wave energy power generation device 100 is adjusted through the floating chamber to ensure that the center of gravity position is close to one-third of the bow.

[0030] It also includes a data acquisition module and a data processing module; The data acquisition module is used to detect the surrounding sea conditions. The data acquisition module can use a buoy, and the buoy moves with the waves; The data processing module has a sea condition table built-in and is used to process the obtained buoy movement information and judge which sea condition level it falls into according to the movement amplitude of the buoy; The risk warning module compares the obtained sea condition level with the preset warning level threshold to judge whether to generate an alarm instruction.

[0031] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0032] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A wave energy device combined with an inner turret type single point mooring system, comprising a rear bent pipe wave energy power generation device (100) and an inner turret type single point mooring system (200), characterized in that: The rotating joint (201) in the inner turret type single point mooring system (200) is detachably mounted on the bottom of the rear curved tube wave energy power generation device (100) and is located below the center of gravity of the rear curved tube wave energy power generation device (100); The inner turret in the inner turret type single point mooring system (200) is hollow inside and is divided into a plurality of cabins, and a ballast water pump is provided at the bottom of the cabin.

2. A wave energy device combined with an inner turret single point mooring system according to claim 1, characterized in that: The center of gravity of the rear curved pipe wave energy power generation device (100) is close to the bow side.

3. A wave energy device combined with an inner turret single point mooring system according to claim 2, characterized in that: The upper structure of the rear curved tube wave energy power generation device (100) is centrally arranged in the section from the center of gravity to the stern, and the wind load area of ​​the section from the center of gravity to the stern is greater than the wind load area of ​​the section from the center of gravity to the bow.

4. A wave energy device combined with an inner turret single point mooring system according to claim 2, characterized in that: Power devices (101) are provided on both the left and right sides of the stern of the rear curved pipe wave energy power generation device (100).

5. A wave energy device combined with an inner turret single point mooring system according to claim 1, characterized in that: It also includes a data acquisition module and a data processing module; The data acquisition module is used to detect surrounding sea conditions information; The data processing module is used to process the acquired sea condition information to obtain the sea condition level; The risk warning module is used to compare the obtained sea condition level with the preset warning level threshold to determine whether to generate an alarm instruction.

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