Offshore oscillating water column wave energy conversion device with external air-permeable structure

Abstract

The present invention belongs to the technical field of new energy utilization, and provides an offshore oscillating water column wave energy conversion device with an external air-permeable structure, including an oscillating water column system, an anchoring and fixing system, and an air-permeable structure. The present invention effectively combines an offshore oscillating water column wave energy conversion device and an air-permeable structure. The offshore floating structure can be applied to deep-sea areas with greater wave energy density, which can effectively improve the output power of the device; the air-permeable structure does not affect the transmission of long waves of the target sea conditions into the air chamber, and can also effectively reduce the large wave loads on the device caused by short waves in the waves, protecting the safety of the structure, thereby ensuring that the oscillating water column wave energy conversion device can operate efficiently and stably for a long time.

Description

Technical Field

[0001] The invention relates to an offshore oscillating water column wave energy conversion device with an external air-permeable structure, belonging to the technical field of new energy utilization. Background Art

[0002] With the development of social economy, the global demand for energy is increasing, while traditional non-renewable fossil energy such as coal, oil, and natural gas is decreasing. At the same time, the pollutants emitted by the consumption of fossil energy have caused great harm to the environment. Therefore, the development and utilization of new energy has become the focus of attention of countries around the world. The ocean contains huge energy resources, among which wave energy is a very important renewable energy source. So far, people have invented various wave energy conversion devices to extract energy from waves. Among them, the oscillating water column wave energy conversion device has become one of the most widely studied and applied wave energy devices in the world due to its advantages of simple structure and reliable performance.

[0003] The wave energy flow density in the shallow coastal waters is relatively low, resulting in a low conversion efficiency of the wave energy conversion device, which is not conducive to the large-scale development of wave energy and brings limited economic benefits. Therefore, countries around the world are currently turning their research and development focus to offshore wave energy conversion devices. The oscillating water column wave energy device is mainly composed of an air chamber with an opening at the bottom, a bidirectional air turbine at the top, and a generator. During operation, the water column in the air chamber vibrates up and down under the action of waves, forcing the air in the air chamber to generate reciprocating airflow at the air hole, driving the air turbine to rotate, thereby further driving the generator to generate electricity.

[0004] Due to the complexity of the working environment of wave energy devices and the increasing frequency of extreme sea conditions, accidents in which wave energy conversion devices are destroyed by waves have occurred from time to time in recent years, and the survivability of the device faces huge challenges. The water column inside the air chamber of the oscillating water column wave energy device mainly has two kinds of movements: piston and sloshing. The energy conversion of the device is mainly contributed by the piston movement of the oscillating water column. The water column in the device mainly produces piston movement under the action of long waves; due to the weak transmission ability of short waves, under the action of short waves, a large reflection will occur on the outside of the air chamber, and the water column in the air chamber will produce sloshing movement, resulting in low energy conversion efficiency and large wave load when the device is acted on by short waves. The air-permeable structure has a good wave-breaking effect and is widely used in marine engineering structures that require wave-breaking. Therefore, the present invention proposes to add an air-permeable structure around the device to reduce the destructive effect of short waves in the waves on the device, thereby improving the survivability of the device. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of existing technologies and, while ensuring a high energy conversion efficiency of the wave energy device, design an offshore oscillating water column wave energy conversion device with an external air-permeable structure. The use of this external air-permeable structure has little effect on the hydrodynamic performance of the device under the action of long waves in target working sea conditions, but can effectively reduce the wave load on the device under the action of short waves in non-target working sea conditions, thereby improving the survivability of the device while ensuring the energy conversion efficiency of the device.

[0006] The technical solution of the present invention:

[0007] An offshore oscillating water column wave energy conversion device with an external air-permeable structure, comprising an oscillating water column system, an anchoring and fixing system and an air-permeable structure;

[0008] The oscillating water column system is mainly composed of an air chamber 6, an inner cylinder 1 and a turbine power generation system 4;

[0009] The air chamber 6 is a cavity composed of an outer cylindrical ring body 2 and a hemispherical ring body 3. The hemispherical ring body 3 is inverted on the outer cylindrical ring body 2, and the lower end is in contact with the outer cylindrical ring body 2, and the two have the same radius; the outer cylindrical ring body 2 is a hollow cylinder with openings at the top and bottom ends, and the hemispherical ring body 3 is a hollow hemispherical body; an air hole channel 9 is provided at the center of the top of the hemispherical ring body 3, and a turbine power generation system 4 is arranged in the air hole channel 9; the turbine power generation system 4 is composed of an air turbine and a generator, and the air turbine is connected to the generator;

[0010] The inner cylinder 1 is located on the axis of the air chamber 6, and the top end is connected to the bottom end of the supporting truncated cone 5; the top end of the supporting truncated cone 5 is connected to the hemispherical ring body 3, and fits with the inner surface of the hemispherical ring body 3; the supporting truncated cone 5 is provided with a cylindrical air hole penetrating the truncated cone, and the top center of the supporting truncated cone 5 is provided with an air hole channel 9, which is connected with the air hole of the hemispherical ring body 3;

[0011] The mooring and fixing system is composed of a plurality of anchor chains 8, one end of each anchor chain 8 is connected to the bottom edge of the inner cylinder 1, and the other end is fixed to the seabed;

[0012] The hollow structure 7 is a hollow cylinder with openings at the top and bottom, and has many cylindrical holes distributed on the surface. The inner surface of the hollow structure 7 fits with the outer surface of the outer cylindrical ring body 2.

[0013] Beneficial effects of the invention: The invention effectively combines the offshore oscillating water column wave energy conversion device and the air-permeable structure. The offshore floating structure can be applied to deep sea areas with greater wave energy density, which can effectively improve the output power of the device; the air-permeable structure does not affect the transmission of long waves of the target sea conditions into the air chamber, and can also effectively reduce the large wave loads generated by short waves in the waves on the device, protecting the safety of the structure, thereby ensuring that the oscillating water column wave energy conversion device can operate efficiently and stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of an offshore oscillating water column wave energy conversion device with an external air-permeable structure according to the present invention.

[0015] Figure 2 Schematic diagram of the structure of the inner cylinder and the outer cylindrical ring.

[0016] Figure 3 Schematic diagram of the structure of a hemispherical ring.

[0017] Figure 4 It is a structural schematic diagram of the air-permeable structure.

[0018] Figure 5 A cross-sectional diagram of the supporting truncated table.

[0019] In the figure: 1 inner cylinder; 2 outer cylindrical ring body; 3 hemispherical ring body; 4 turbine power generation system; 5 supporting truncated table; 6 air chamber; 7 air permeable structure; 8 anchor chain; 9 air hole channel. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0021] like Figure 1 The offshore oscillating water column wave energy conversion device with a permeable structure includes an oscillating water column system, an anchoring and fixing system and a permeable structure. The oscillating water column system is mainly composed of an air chamber 6, an inner cylinder 1 and a turbine power generation system 4. The anchoring and fixing system is composed of a plurality of anchor chains 8. The permeable structure 7 is on the outermost side.

[0022] For the oscillating water column system, the air chamber 6 is composed of an outer cylindrical ring body 2 and a hemispherical ring body 3. The hemispherical ring body 3 is located on the outer cylindrical ring body 2, and the two have the same radius. An air hole channel 9 is provided at the center of the top of the hemispherical ring body 3, and a turbine power generation system 4 is arranged in the air hole channel 9, which rotates in the same direction under the action of bidirectional airflow. The inner cylinder 1 acts as a float to provide buoyancy for the entire system, and the top is connected to the supporting cone 5 to form an air chamber with the outer cylindrical ring body 2. A cylindrical air hole is provided inside the supporting cone 5 to allow airflow to enter the air hole.

[0023] When in use, the device floats on the water surface. Under the action of the waves, the waves enter the outer cylindrical ring body 2. The water column in the outer cylindrical ring body 2 oscillates up and down under the action of the waves, forcing the gas inside the air chamber to expand and compress, forming an air flow through the cylindrical air holes of the supporting truncated cone 5 into the air hole channel 9 in the middle of the top of the hemispherical ring body 3, driving the turbine generator 4 to rotate and generate electricity. The outermost permeable structure 7 protects the outer cylindrical ring body 2 when the device is working, so that it is not damaged by waves and causes the device to fail.

[0024] The top of the air chamber 6 is provided with a cylindrical air hole, and the air flow enters the air hole through the hemispherical ring body 3, which can reduce resistance, increase air flow speed, and improve power generation efficiency.

[0025] The turbine power generation system 4 can rotate under the action of bidirectional airflow, and the air chamber can generate electricity in both the process of air intake and air exhaust.

[0026] The inner cylinder 1 is located on the axis, which can reduce the sloshing of the water surface inside the air chamber.

[0027] The air-permeable structure 7 can effectively reduce the impact and damage of short waves on the device, protect the safety of the device and improve its survivability.

[0028] In addition to the above-mentioned embodiments, the present invention may also have other embodiments. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. An offshore oscillating water column wave energy conversion device with an external air-permeable structure, characterized in that: It includes an oscillating water column system, an anchoring system and a permeable structure; The oscillating water column system is mainly composed of an air chamber (6), an inner cylinder (1) and a turbine power generation system (4); The air chamber (6) is a cavity composed of an outer cylindrical ring body (2) and a hemispherical ring body (3). The hemispherical ring body (3) is inverted on the outer cylindrical ring body (2), and the lower end is in contact with the outer cylindrical ring body (2). The two have the same radius. The outer cylindrical ring body (2) is a hollow cylinder with openings at the top and bottom ends, and the hemispherical ring body (3) is a hollow hemispherical body. An air hole channel (9) is provided at the center of the top of the hemispherical ring body (3), and a turbine power generation system (4) is arranged in the air hole channel (9). The turbine power generation system (4) is composed of an air turbine and a generator, and the air turbine is connected to the generator. The inner cylinder (1) is located on the axis of the air chamber (6), and the top end is connected to the bottom end of the supporting truncated cone (5); the top end of the supporting truncated cone (5) is connected to the hemispherical ring body (3) and fits the inner surface of the hemispherical ring body (3); the supporting truncated cone (5) is provided with a cylindrical air hole penetrating the truncated cone, and the top center of the supporting truncated cone (5) is provided with an air hole channel (9) which communicates with the air hole of the hemispherical ring body (3); The mooring and fixing system is composed of a plurality of anchor chains (8), one end of each anchor chain (8) is connected to the bottom edge of the inner cylinder (1), and the other end is fixed to the seabed; The hollow structure (7) is a hollow cylinder with openings at the top and bottom and a large number of cylindrical holes distributed on the surface. The inner surface of the hollow structure (7) fits with the outer surface of the outer cylindrical ring body (2).

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