JPH03137984A - Seawater desalting apparatus utilizing wave power - Google Patents

Abstract

PURPOSE:To desalt seawater, to simplify a system and to reduce the cost of the system to a large extent by constituting the title apparatus of a support float body loaded with a seawater pump having a float floating on the surface of the sea and a piston, an arm and a reverse osmosis module. CONSTITUTION:A support float body 1 floating within the sea moves up and down corresponding to the ebb and flow of the tide but, since the fulcrum of the lever 3 pivotally mounted to a seawater pump 4 and a float 2 is provided to the support float body 1, the relative position of the support float body 1, the seawater pump 4, the lever 3 and the float 2 to the surface L of the sea does not change by the ebb and flow of the tide and, since the support float body 1 is present within the sea and receives almost no effect of a wave, the float 2 moves up and down by a wave regardless of the ebb and flow of the tide to operate the seawater pump 4. Wave power is amplified by the toggle mechanism of the lever to be transmitted to the seawater pump 4 and seawater is sent to a reverse osmosis membrane module. By this constitution, seawater is desalted by the module to be converted to fresh water.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a seawater desalination device that utilizes the energy of sea waves.

[Conventional technology]

A conventional seawater desalination device using wave power is shown in Figure 3.

A float o1 is housed in a rock wall 05, and an outer cylinder 06 with its lower part opened into the sea is fixed, and a piston rod 07 of an oil pump 02 above the sea level is fixed on a rock wall 01, and the vertical movement of the float o1 due to waves is fixed. This drives the piston of the oil pump 02, and the hydraulic pressure generated thereby drives the seawater pump o3 to send seawater from the seawater pump 03 to the reverse osmosis membrane module o4 for desalination.

In some cases, an air piston is used instead of the oil pump 02, and the seawater pump is driven by the air pressure generated by the air piston.

[Problem to be solved by the invention]

The conventional device shown in FIG. 3 has the following problems.

α) Since the vertical motion of the wave is connected to the piston of the t-pump without going through an equivalent booster, high pressure cannot be obtained.
Therefore, this pump pressurizes a medium such as low-pressure air or oil, and the pressurized medium such as air or oil drives the seawater pump 03 to obtain high-pressure seawater, and the reverse osmosis membrane module 04
The method used was to desalinate. Since an intermediate medium is used in this way, wave energy cannot be used efficiently.

(2) Flow) 01 moves up and down inside the outer cylinder 06 fixed to the quay, but piston flow 1. The vertical movement distance of the oil pump 07 is very long considering the ebb and flow of the tide, which requires a lot of effort and time to center the oil pump 02, and it is difficult to align the axis of the cylinder and casing of the oil pump 02. The file may be damaged due to misalignment. Also, for that reason, oil pump 02
The desalination efficiency of the reverse osmosis membrane module was also low.

The present invention aims to solve the problems of the conventional seawater desalination apparatus using ocean wave power.

[Means to solve the problem]

The seawater desalination device using wave power of the present invention includes a float floating on the sea surface, a support floating body floating in the sea on which a seawater pump with a piston is mounted, and an intermediate portion pivoted to the support floating body and one end of which is attached to the float. The ends are respectively pivotally connected to the piston of the seawater pump, and the distance between the pivot point to the float of the one end and the pivot point to the support floating body is such that the other end is pivotally connected to the piston of the seawater pump. The arm includes a seawater pump operating arm configured to be larger than the distance between a point and a pivot point to the support floating body, and a reverse osmosis membrane module connected to the seawater pump.

[Effect]

In the present invention, the seawater pump is operated via the arm by the downward movement of the float due to waves, and the seawater is sent from the seawater pump to the reverse osmosis membrane module to desalinate the seawater and obtain desalinated water.

The arm is such that the spacing between the pivot point to the float and the pivot point to the supporting floating body is greater than the spacing between the pivot point to the piston of the seawater pump and the pivoting point to the supporting floating body. Due to the boosting mechanism with a large ratio, the seawater pump obtains high-pressure seawater, which is higher than the osmotic pressure of seawater, into the container due to the vertical movement of the float due to waves, and sends this to the reverse osmosis membrane module. , seawater is desalinated.

For supporting floating bodies floating in the sea, a seawater pump and a float are required.
Due to the provision of a pivot point for the arm with pivoted ends, the pivot point for the float, seawater pump and arm (maintains a constant relative relationship) with respect to the ebb and flow of the tide. Wave power can be used regardless of the tide.

Additionally, seawater with a pressure higher than the osmotic pressure required by the reverse osmosis membrane can be replaced by wave power without using intermediate media such as air or oil, increasing energy conversion efficiency.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a supporting floating body floating in the sea having a support part 1a above the sea surface, and a seawater pump 4 having a piston rod 7 placed below the sea surface and connected to the seawater pump 4 by an outlet pipe 11 and supporting part above the sea surface. Reverse osmosis membrane module 5 supported by 1a
is listed.

The seawater pump 4 is arranged horizontally and is provided with a seawater suction port 6 having a reverse valve. Reference numeral 2 denotes a float that floats on the sea surface LK, and one end of an L-shaped lever 3, whose intermediate portion is pivoted at a fulcrum 10, is attached to the support floating body 1.
The other end is pivotally connected to the piston rod 7. The distance between the pivot point of the lever 3 to the float 2 and the fulcrum 10 is larger than the distance between the pivot point of the lever 3 to the piston rod 7 and the fulcrum 10, forming a boosting mechanism. ing. The lever 3 is provided with a portion 3a extending upward from the fulcrum 10 on the opposite side of the piston rod pivot point, and the support floating body 1 has two contact portions 3a corresponding to this portion 3a. A stopper 8 having portions 8a and 8b is provided to suppress movement of the lever due to excessive vertical movement of waves. In addition, 9 in the figure is a pump mount of the support floating body 1 that supports the seawater pump 4.

In this embodiment, as shown by the arrow in FIG.
- The piston of the seawater pump 4 moves left and right via the arm 3 rotating about the fulcrum 101 due to the vertical movement of the boat 2 due to the waves, thereby pumping up seawater. In this case, the wave power is amplified and transmitted to the seawater pump 4 by the boosting mechanism of the arm 3, the pressure of the seawater is increased to a pressure higher than the osmotic pressure, and the seawater is sent to the reverse osmosis membrane module 5 via the outlet pipe 11. . In this module 5, seawater is desalinated and becomes fresh water (desalinated water).

The support floating body 1 floating in the sea moves up and down depending on the tide,
Since the fulcrum 10 of the arm 3, which is pivotally connected to the seawater pump 4 and the float 2, is provided on the support float 1, the relative positions of the support float 1, the seawater pump 4, the lever 3, and the float 2 relative to the sea surface depend on the tide. Does not change due to tides and supports floating body 1
Since it is in the sea and is hardly affected by waves, the seawater piston/4 is operated by the 7C7-to2 being moved up and down by the waves regardless of the ebb and flow of the tide.

Note that the lever 3 does not necessarily have to be L-shaped,
Further, by changing the position of the fulcrum 0, it is possible to set the pressure to be suitable for the operating pressure of the reverse osmosis membrane module.

In addition, in the above embodiment, the reverse osmosis membrane module is installed on the support floating body to eliminate the need for land-based incidental equipment, but it is not necessarily necessary to install it on the support floating body, and it can be installed on land, etc. It may also be provided at a location different from the floating body.

Furthermore, by housing desalination-related equipment such as seawater pretreatment equipment in the support float, the weight of the support float can be increased and the support float can be made more stable against shaking.

〔Effect of the invention〕

The present invention can have the following effects.

(1) The present invention makes it possible to desalinate seawater by using a simple device to pressurize seawater to a necessary pressure using wave power regardless of the ebb and flow of the tide, and by using a reverse osmosis module.

(2) Conventional seawater desalination equipment using wave power first converts energy from other media such as air, oil, or electricity to drive a seawater pump for desalination, but the present invention directly goes beyond this. Since the seawater bonder is driven by the system, the system is simple and costs can be reduced significantly.

(3) When an intermediate medium is used as in the past, the energy conversion efficiency of the medium is also taken into consideration, and the overall energy efficiency decreases, but the present invention does not require such extra energy conversion efficiency to be taken into consideration. The overall energy conversion efficiency is increased and wave energy can be used efficiently.

[Brief explanation of the drawing]

FIG. 1 is an overall view of an embodiment of the present invention, FIG. 2 is an enlarged view of essential parts of the same embodiment, and FIG. 3 is an overall conceptual diagram showing a conventional seawater desalination apparatus using wave power. DESCRIPTION OF SYMBOLS 1... Support floating body, 2... Float, 3... Lever, 4... Seawater pump, 5... Reverse osmosis membrane module, 6... Seawater suction port. bird 1m

Claims (1)

[Claims] A float floating on the sea surface, a support floating body floating in the sea on which a seawater pump having a piston is mounted, and an intermediate portion pivoted to the support floating body, one end of which is pivoted to the float and the other end pivoted to the piston of the seawater pump. and the interval between the pivot point to the float at the one end and the pivot point to the supporting floating body is the same as the pivot point to the piston of the seawater pump at the other end and the pivot point to the supporting floating body. 1. A seawater desalination device using wave power, comprising: an arm configured to operate a seawater pump configured to have a spacing larger than 1, and a reverse osmosis membrane module connected to the seawater pump.