JPS60104780A - Pressure setting method of constant-pressurized tank for wave force power generation - Google Patents

Abstract

PURPOSE:To make a pressure setting value adjustable according to a variation in wave energy as well as to bring the long-term stabilization of wave force power generation to fruition, by installing a loading chamber in the upper part of an air chamber, while feeding or draining a specified quantity of loading work such as fluid or powdery granules, etc., to or from this loading chamber. CONSTITUTION:A wave force power generating set consisting of a constant-pressurized tank system leads air energy produced at an energy absorber converting wave force into the air energy into an air chamber 43 of a constant-pressurized tank 4' via an air feed pipe 3, then feeds the air energy being regulated hereat to an air turbine through a lead-out pipe 5 and drives a generator. In this case, a partition wall 46 is installed inside an air tank 42 of the constant-pressurized tank 4', and a loading chamber 47 is partitively formed in the upper part of the air chamber 43 whereby water 48 as loading work is housed inside the said chamber 47. And, each of control valves 52 and 53 is installed alongside in a feed water pipe 50 and a drain pipe 51, controlling these valves 52 and 53 for their opening or closing, and the water 48 inside the loading chamber 47 is fed or drained each whereby the setting pressure of the constant-pressurized tank 4' is regulated as specified.

Description

[Detailed Description of the Invention] The present invention relates to a pressure setting method in a constant pressure tank for wave power generation in order to perform high quality and stable wave power generation, and more specifically, to supply and discharge water etc. as a loading material. The present invention relates to a pressure setting method for setting the air pressure in an air chamber to be high or low according to the state of wave energy.

(Background Art) FIG. 1 shows a conventional wave power generation system using a constant pressure tank system.

That is, the vertical motion of the waves 1 is converted into air energy by the energy absorbing devices 2, and the air energy is introduced into the constant pressure tank 4 through the header pipe 3, where it is stored for a short period of time and stabilized.

In the constant pressure tank 4, an air tank 42 with an open bottom is movably placed over a water tank 41 with an open top that stores water 40 to a predetermined level, and an air chamber 43 is formed as a closed space above the water surface. The ladder pipe (air introduction pipe) 3 has an outlet 44 projecting above the water surface and connected to an air chamber 43. The inlet 45 of the air outlet pipe 5 is also projected above the water surface and connected to the air chamber 43.

In this way, the air in the air chamber 43 is pressurized by the weight of the air tank 420, and the pressure is constant based on the weight.

The air energy made constant in the pressure regulating tank 4 is led to an air turbine 6 through an air outlet pipe 5, and the power generated by the air turbine 6 rotates a generator 7 to generate electricity.

As mentioned above, the constant pressure tank 4 is for supplying constant air energy to the air turbine 6, and the pressure at which the air turbine 6 exhibits the best efficiency is generally about 120 waAq to 250 wIAq. Set.

In this case, it is important to determine the set pressure of the constant pressure tank 4 in consideration of the wave energy absorption efficiency of the energy absorption device 2 .

This is because, for example, when the paid wave height is 1 m or less and the pressure setting value of the constant pressure tank 4 is 1 m of water column, the air energy converted by the energy absorption device 2 will not be able to enter the constant pressure tank 4, and the energy absorption device 2 does not operate effectively. Therefore, the air energy in the constant pressure tank 4 decreases and becomes empty as it is consumed, making it impossible to generate electricity.

On the other hand, when the wave height is 2 m or more, if the pressure setting value of the constant pressure tank 4 remains at 1 m of water column, air energy will accumulate in the constant pressure tank 4, but it will not fill up quickly, and any more energy will be lost. Absorption has to be abandoned, which is inefficient.

Therefore, regarding the constant pressure tank 4, it is possible to constant pressure the air energy absorbed and converted by the energy absorption device, that is, to supply steady air energy to the air turbine, and in addition, the pressure setting value can be adjusted according to changes in wave energy. change from time to time (
It is desirable to improve the efficiency of wave energy absorption and achieve long-term stability of wave power generation.

(Purpose of the Invention) Therefore, the purpose of the present invention is to make the air energy absorbed by the energy absorption device constant (steady pressure) to the pressure with the best turbine efficiency, and to increase or decrease the pressure at any time according to changes in wave energy. It is an object of the present invention to provide a pressure setting method for a constant pressure tank for wave power generation, which is improved so as to be able to vary the pressure.

(Structure and Effect of the Invention) In order to achieve the above object, the pressure setting method of the present invention provides a loading chamber above the air chamber in the air tank of a constant pressure tank for wave power generation, and It is configured to supply or discharge a predetermined amount of a loading material such as a liquid or granular material in accordance with changes in the magnitude of wave energy.

As the loading material, water is the most common and easy to handle, but sand or shot can be used as well.

In other words, when loading material is supplied to the loading chamber, the weight of the air tank becomes correspondingly large, and the pressure applied to the air in the air chamber increases, so that the air pressure can be set high.

Therefore, the air chamber can accommodate a large amount of air energy and maintain a constant pressure with a small capacity that is inversely proportional to the increase in set pressure. That is, when the paid wave height is large, the air energy can be stored at a high density and the pressure can be maintained at a constant pressure by the larger set pressure even though the air chamber has the same volume, resulting in high efficiency.

On the other hand, when the loading wing is discharged, the weight of the air tank decreases accordingly, the pressure applied to the air in the air chamber decreases, and the air pressure can be set low.

Therefore, even when the paid wave height is small, the air energy converted by the energy absorption device is removed, and even when the wave energy is small, the energy can still be absorbed and replenished, and the constant pressure tank will not be empty, so wave power generation It is possible to achieve long-term stabilization.

In addition, the influence on the air turbine due to fluctuations in the pressure setting value of the constant pressure tank is determined by making the air turbine a variable turbine, and controlling the turbine properties such as the nozzle throttling ratio in response to fluctuations in the general pressure setting value. By doing so, the generated torque and rotational speed of the diturbine can be made constant, thereby making it possible to perform high-quality wave power generation.

(Example) Next, the embodiment shown in FIG. 2 will be explained.

In the figure, 4 indicates the entire constant pressure tank. This constant pressure tank 4 is a water tank 4 with an open top that stores water 40 to a predetermined level.
An air tank 42 with an opening at the bottom is placed inside the tank 1 so as to be movable up and down, and an air chamber 43 is formed as a closed space above the water surface.

The header vibe 3 that guides the air energy converted by an energy absorption device (not shown) has its outlet 44 connected to the water surface 44.
It projects upward and is connected to the air chamber 43. In addition, an air outlet pipe 5d5 that guides the air energy in the air chamber 43 to an air turbine (not shown) and its port 45 are made to protrude above the water surface and are connected to the air chamber 43.

In the air tank 42, an air chamber 4 partitioned by a partition wall 46
A loading chamber 47 is provided above the container 3, and water 48 as a loading material is accommodated here.

A water supply pipe 50 and a drain pipe 51 are connected above and below the loading chamber 47, and control valves 52 and 53 are installed in each.

That is, when the control valve 52 is opened and the water 48 is supplied to the loading chamber 47, the pressure applied to the air in the air chamber 43 increases by that amount, and the air pressure can be set higher. Conversely, when the control valve 53 is opened and the water 48 in the loading chamber 47 is discharged, the pressurizing force on the air in the air chamber 43 decreases accordingly.
The set air pressure can be lowered.

Therefore, a wave height needle is installed on the coast where the energy absorption device is installed, and a pressure needle is also installed in the air piston chamber of each energy absorption device to measure the membrane wave height or generated air pressure for about 20 minutes every two hours. The control valve 52 or 53 is automatically controlled based on the measurement result.

For example, when the membrane wave height is 1 m, the air pressure in the constant pressure tank 4' is set to 0.5 m of water column. Or the membrane wave height is 2
m, the water column is set to 1.0 m, and when the membrane wave height is 3 m, the water column is set to 1.5 m.

By doing this, even when the waves are calm, such as when the waves are calm, the air energy absorbed and converted by the energy absorption device can be stored in the constant pressure tank 4', and when there are strong winds and waves, a large amount of wave energy can be stored in a high density. It can be absorbed and stored.

Therefore, it is possible to generate wave power that is of high quality and stable over the long term.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing a constant pressure tank type wave power generation system, and FIG. 2 is a conceptual diagram of a constant pressure tank in which the method of the present invention is implemented. Applicant: Takenaka Corporation Co., Ltd. Applicant: Foundation for Artificial Engineering Foundation Attorney Patent Attorney Yujiro Taka Continued from page 1

Claims (1)

[Claims] (11) In a water tank with an opening on the top that stores water up to a predetermined level,
An air chamber is formed by covering an air tank with an opening on the bottom that can be raised and lowered freely.
In a pressure setting method for a constant pressure tank for wave power generation in which an air inlet pipe and an air outlet pipe are protruded above the water surface and connected to an air chamber, a loading chamber ( A pressure setting method for a constant pressure tank characterized by providing four forces and supplying or discharging a predetermined amount of loading (4B) such as liquid or powder to this loading chamber (47).