KR101548433B1 - Oscillating Water Column Type Wave Energy Harvest - Google Patents

Abstract

The upper and the lower ends of the plate meet to be hermetically closed with respect to the body and the lower ends thereof are cut by a set height from the bottom of the body, A partition wall formed in the tunnel to connect the two spaces through the plate shape; a turbine installed in the tunnel and driven by a flow of air passing through the tunnel; and a generator The body is filled with liquid and air having good fluidity, so that the liquid moves in two spaces by the waves, and the pressure of the air is changed to move the air through the tunnel connecting the two spaces. Accordingly, The present invention provides a vibration power type wave power generation device that generates power.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an Oscillating Water Column Type Wave Energy Harvest

The present invention relates to a vibration power type wave power generator using a pair of vertical chambers.

There are many ways of generating power using waves. Mostly, there is a buoy with built-in generator, pendulum and gear, and it is shaking according to the waves, so that the swinging motion of the pendulum in the buoy is changed to rotary motion through gears, . In this method, since the gear must be rotated by the moment force of the pendulum, the pendulum needs to be long in order to increase the moment force, and the size of the pendulum is increased.

There is also a method in which a generator is built in a device fixed on a rock wall, and a water turbine and a windmill are rotated by up and down movement of a wave and power is generated therefrom.

The outline of wave power generation is a method of converting the energy of an incident wave into a driving force of a prime mover such as a turbine and generating electricity. There are a floating type and a fixed type according to the installation method. Considering the kinetic efficiency according to the size of energy, it is preferable that the floating type is advantageous. However, the fixed type is advantageous in designing and construction, easy to use with the breakwater, and easy to transport the extracted energy.

On the other hand, wave power generation can be largely divided into a method of converting the underwater pressure generated by up and down motion, horizontal motion or waves of wave into air, mechanical, or hydraulic energy, respectively, according to the direction of wave motion. In recent years, mainly in the United Kingdom, there has been a significant increase in the number of passive devices, and air turbines are widely used as an energy conversion method. On the other hand, there are many coastal stationary wave generators in Japan, and mechanical or hydraulic turbines are widely used as conversion methods.

Wave power generators can be classified into various types according to the way of converting kinetic energy of wave into mechanical energy. First, a moving object type system in which a generator floating in a water surface is driven up and down or in a rotational motion by a blue lane, and when a water level in an air chamber fluctuates due to wave action, air is compressed / An oscillating water column method in which the turbine is rotated by the air flow, and a pressure type method in which the water pressure fluctuation in the water is absorbed and converted into air or water flow.

Wave power generators include movable object types, vibration water molds, and wall waveforms. Movable object type is float type and submerged type. Movable type wave power generation method using floating structure that up and down movement or shipping movement around the hinge fixed by wave is a method of directly absorbing wave energy. The characteristic is high efficiency because all the movement of the creator can be converted into energy, good when the direction is constant, but there is a possibility that it will not move well if it changes rapidly.

There are floating type and fixed type wall type, and the concept of using the reciprocating motion of the air in the air chamber by the waves is to convert the wave energy to the air flow and then convert it into the mechanical rotation by using the air turbine to be. Features are very simple in structure, but inefficient.

The wall waveform is installed on the breakwater, and it is installed on the slope in the direction of the wave propagation, and the water is moved to the place where the seawater is high by the wave, and the water is stored so as to have the potential energy. The auric turbine installed at the bottom is rotated to generate electricity.

All of the above-mentioned wave energy can not be effectively used as electric power. However, until now, various ideas have been proposed, and most of the currently used air turbine systems have been used.

In Korea, the air movement of the sea surface by the waves is made by the piston, and the air turbine is rotated to drive the generator. In the method of fixing to the shore, the open barrel of the both ends is fixed to the wall of the seashore, and the sea surface in the air chamber moves up and down according to the ascending and descending movement of the sea surface by the wave. The flow can be maintained in only one direction. The power generation method floating in the sea is mostly used in the lighthouse. Even if the air chamber moves up and down according to the waves, the sea surface in the air chamber completely coincides with it and the air does not move. This method has been put to practical use as a power source for navigation signs and the like.

On the other hand, overcoming natural disasters and harsh sea weather is always an essential requirement for wave energy harvesting equipment. Research on energy harvesting devices using offshore waves has been conducted worldwide. Most of which are complex and large in size, which is costly for larger power generation. Another problem is that maximum efficiency can not be guaranteed in bad weather conditions.

Korean Patent Publication No. 10-2004-0096477 (published on November 16, 2004) Korean Patent Publication No. 10-2009-0015263 (Publication Date: Feb. 12, 2009) Korean Patent Laid-Open No. 10-2007-0065601 (published on June 25, 2007) US Patent No. US7554216 (Published on June 30, 2009) Canadian Published Patent CA 2286545 (Published on November 26, 2000)

The vibration power type wave power generator according to the present invention can be easily applied to a farm, a ship, a float, and the like in a marine environment having poor environmental conditions to enable energy harvesting caused by waves.

The vibration power type wave power generator according to the present invention is capable of preventing marine pollution by using renewable energy, preventing environmental pollution, and minimizing maintenance cost.

The vibration power type wave power generator according to the present invention is intended to prevent the exhaust gas from being discharged without operating cost, to prevent the system from being damaged by the wave power of waves, and to maximize the energy generation efficiency.

According to an aspect of the present invention, there is provided a vibration power type wave power generator comprising: a plate having a shape dividing the body into two vertical spaces; And the lower end is cut at a predetermined height from the bottom of the body, and at one side of the upper end, a tunnel is formed to connect the two spaces through the plate shape. A turbine installed inside the tunnel and driven by a flow of air passing through the tunnel; And a generator for generating electrical energy by driving the turbine, wherein the body is filled with liquid and air having good fluidity.

According to the present invention, it is possible to prevent environmental pollution by replacing an existing oil-based generator with a vibration power type wave power generation device using renewable energy for a device requiring a small energy such as a farm, ship, float, It is also expected to be minimized and can be applied to various fields such as environmental monitoring and communication because it is possible to supply power continuously to the marine environment.

In addition, according to the present invention, it is possible to apply power to various fields such as environmental monitoring, communication, and the like because it enables continuous power supply to the marine environment.

1 is a perspective view schematically showing a vibration power type wave power generator according to an embodiment of the present invention,
FIG. 2 is a schematic view of a position of a vibration power type wave power generator according to an embodiment of the present invention,
FIG. 3 is a schematic view showing a state in which the vibration power type wave power generator is provided at the maximum inclined position according to the embodiment of the present invention,
4 and 5 are views schematically showing a vibration power type wave power generator according to another embodiment of the present invention, and Fig.
Figure 6 is a schematic representation of a Wells turbine and generator.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings.

The terms or words used in the present specification and claims are intended to mean that the inventive concept of the present invention is in accordance with the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain its invention in the best way Should be interpreted as a concept. It will be apparent to those skilled in the art that the present invention may be practiced without specific details such as specific circuit components in the following description.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for converting wave energy into electric energy, and is an oscillating water column (OWC) wave power generator in which a sea surface floats. Closed OWCs in accordance with one embodiment of the present invention are designed to withstand harsh sea weather and are designed with low cost and low management costs in mind. The present invention is an offshore energy harvesting device for generating electric power. An object floating in the ocean, such as an offshore boat or boat, and a farm, may generate the electricity necessary from the present invention.

The vibration power type wave power generator according to an embodiment of the present invention includes a hollow closed body 100, a partition 110 dividing the body 100 into two vertically spaced spaces, A tunnel 111 penetrating the partition 110 and connecting the two spaces to each other; a vertical wall 111 installed perpendicularly to the longitudinal direction of the tunnel 111 and rotated according to the flow of air passing through the tunnel 111 to generate electricity; And a generator 300 for generating electrical energy by driving the turbine 200. The turbine 200 includes a turbine 200,

The body 100 may be formed as a polygonal columnar, cylindrical, spherical, or elliptic closed shell. Inside the body 100, gas and liquid insoluble in each other are filled with the set ratio. The gas may include air and the liquid may include water.

The partition wall 110 is in the shape of a plate and the edge of the partition wall 100 is in contact with the inner surface of the body 100 so that the two spaces of the body 100 are watertightly divided by the partition wall. The bottom of the partition wall 110, which meets the inner bottom surface of the body 100, is cut at a height indicated by d _open in FIG. 1 to form a through hole. In addition, a tunnel 111, which is a through-path passing through the partition wall, is provided at an upper end of the partition 110.

As shown in FIGS. 5 and 6, according to another embodiment of the present invention, it is possible to further include a floating part 400 floating the body 100 on the sea surface.

The turbine 200 may use a well turbine (WELLS TURBINE). 6 is a schematic view of a well turbine and a generator. As shown in FIG. 6, the well turbine can maintain a constant direction in the bidirectional air flow due to the symmetry of the blade blades. The rotor 11 of the well turbine 10 is rotated by the change of the air pressure and the power is produced through the generator electrically connected to the well turbine 10. [ The well turbine 10 is rotatable in one direction even if the air flow direction is changed. In the embodiment of FIG. 5, the turbine 200 is installed in the tunnel 111 installed at the upper end of the partition 110 through the partition 110 so that the rotating surface of the blade is perpendicular to the air flow indicated by the arrow. When the wells turbine is applied, the rotor of the turbine 200 rotates in a certain direction to generate electrical energy through the generator even if the direction of the airflow passing through the turbine 200 is changed. 5, when the body 100 is tilted to the left as shown in FIG. 5, the water surface of the liquid inside the body 100 maintains the horizontal line of FIG. 5, so that the inside of the body 100 with respect to the body 100 The surface of the liquid rises by the maximum tan &thetas; and the volume of the liquid increases in the all-left space, so that the air moves in the direction of the arrow shown. Conversely, when the body 100 is tilted to the right, unlike FIG. 5, the air moves in a direction opposite to the arrow direction of FIG. That is, the direction of the air flow changes because the air moves through the tunnel 111 through both sides of the space divided by the partition 110 according to the direction in which the body 100 is tilted at sea level, The turbine 200 of the present invention applying the well turbine can be driven in a certain direction.

Inside the body 100, liquid and gas are filled at a certain rate. Depending on the specific gravity, the liquid is located below and the gas above. Accordingly, the liquid moves through the through hole formed by cutting the lower end of the plate-like partition 110, and the gas is divided by the partition 110 through the tunnel 111, which is a through-path passing through the partition 110 It is possible to move between both spaces. When the body 100 is tilted when waves or waves are encountered, the liquid in the body 100 is kept horizontal with the sea surface even if the body 100 is tilted, The liquid is moved from one space to the other space through the penetrating hole where the lower end of the partition 110 is cut. 5, the height of the liquid in the body 100 rises on the basis of the body 100, so that the liquid moves from right to left, and the gas flows to the left side To the right. When the liquid moves to the left space, when the pressure of the gas located on the liquid increases, the gas moves rightward through the tunnel 111 at the upper end of the partition wall. When the liquid moves to the right space, And moves to the left space. When the gas passes through the tunnel 111, the turbine 200 installed in a direction perpendicular to the moving direction of the air is driven in the tunnel 111, and the generator 300 generates electric energy according to the driving of the turbine 200 .

Fig. 2 is a view showing the position of a power generator according to waves. Referring to Fig. 2, five devices are floated on a wave in Fig. The blue curves are the lines representing the wavefronts at t ₁ , t ₂ , t ₃ , t ₄ , and t ₅ , respectively. The device tilts at t ₁ horizontally and tilts back to t ₅ according to the wavefront. the liquid inside the body 100 moves from one space to the other space, and then returns to the one space from the other space from t ₁ to t ₅ .

Assuming that the triangle shown in Fig. 3 (a) is a liquid moving from t ₁ to t ₃ , the tilted angle is θ and tan θ (t) = b (t) / a.

Then, b (t) = a tan? (T).

Here, a = l / 2, the length of one side space,

b (t) is the instantaneous wave inside the space,

[theta] (t) is the tilt angle,

T is the period of the wave,

Φ is the inclination angle of the wave,

d is the height of the body,

A ₁ is the area of the triangular part of the liquid,

₁ υ is the velocity of the air above the liquid surface,

A ₂ is the area of the turbine rotor,

υ ₂ is the air passing speed in the turbine rotor,

L is the liquid wavelength,

χ is the horizontal distance during the period T / 4,

H digging,

rt is the radius of the turbine rotor,

When ρ is the density of the gas,

Referring again to Figure 3 (a)

= 1 / 2a ² tan? (In Fig. 3 (b)

Referring to FIG. 3 (b), the device has a maximum tilt angle at t ₃ .

_{(t 3 -t 1) = T} / 4

If the device is at the maximum tilt position, the liquid inside will traverse the distance b = d / 2 during T / 4.

Therefore, when t = T / 4, b (t) = b;

이다.The average tunnel through air velocity

to be.

Also, in the continuity formula

A ₁ υ ₁ = A ₂ υ ₂

3 (b) again,

x = L / 4

이다.

to be.

So the velocity of the passing gas in the rotor is

이다.

to be.

Therefore, the power that can be generated by the turbine

이다.

to be.

It can be seen that the power output from the above equation depends on the spatial dimensions of the body, the turbine radius and the period of the waves.

It can be used in the field of utilizing all the devices that can be performed on land, such as farms, ships, floats, etc., which are difficult to receive power from the land in marine environment.

Water circulates and flows out into a pair of vertical chambers by the waves, and the internal air generates a flow of air twice as strong as that of the existing OWC (Oscillating Water Column) through a draft tube. The generator 300 is driven by rotating the turbine 200 using the air flow thus generated. A plurality of turbines 200 may be used.

As described above,

It is anticipated that it will be possible to create a variety of services that could not be applied at sea by using low-cost and maintenance-free power generators, which have a lot of maintenance costs in environments that require small energy such as aquaculture and ships in the sea with poor environmental conditions. do.

100: Body 110:
111: Tunnel 200: Turbine
300: generator 400: floating part

Claims (4)

A vibration power type wave power generator comprising:
A hollow enclosed body;
The plate-shaped edge is in contact with the inner surface of the body to seal the two spaces. The lower end of the plate-shaped body is cut at a predetermined height from the bottom surface of the body, A partition wall in which a ball is formed;
A tunnel which is a through-hole provided through one side of an upper end of the partition;
A turbine installed inside the tunnel perpendicularly to an air flow passing through the tunnel and driven by a flow of air passing through the tunnel; And
And a generator for generating electric energy by driving the turbine,
Wherein a liquid and a gas insoluble in each other are filled in the body at a predetermined ratio. The method according to claim 1,
Wherein the turbine is a well turbine (WELLS TUBINE). The method according to claim 1,
And a floating portion for floating the body on the sea surface. The method according to claim 1,
Wherein the body is any one selected from a polygonal column, a sphere, and an elliptic sphere.

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