JP2000202429A - Desalting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a desalting device of a small-scale stationary type which is suitable for mounting on moving bodies, such as small boats and life boats, is high in water collection efficiency, conserves energy and is inexpensive. SOLUTION: This device consists of a green house 1, a water collecting trough 6 disposed in the green house 1 and an evaporating dish 2. In such a case, the desalting device comprises a cooling means for the ceiling 11 of the green house 1 for washing the outside surface by the original water lifted by a pumping up means 8, a water absorbing means disposed in the evaporating dish 2 and a pumping up means 8 for feeding the original water to the cooling means and the water absorbing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing fresh water from seawater or sewage.

[0002]

2. Description of the Related Art As a first prior art, a cooling cylinder, an evaporating dish, and a gutter are arranged in a greenhouse formed by being surrounded by a transparent body, and water such as seawater or muddy water is pumped by a solar cell driven pump. Water is cooled by sending water to the cooling cylinder in the greenhouse, the water that has passed through the cooling cylinder is stored in an evaporating dish, and evaporated to make the greenhouse a saturated vapor pressure environment, and the saturated steam is cooled by the cooling cylinder and condensed on the surface of the cooling cylinder. There is a solar freshwater desiccator that produces fresh water by dropping condensed water drops on a gutter and collecting this (for example,
JP-A-5-57272).

[0003]

However, in the prior art, since the water preheated by the cooling cylinder in the greenhouse is stored in the evaporating dish, the heat efficiency is expected to be improved, but the cooling cylinder is required. It becomes necessary, the number of parts increases, and the cost increases. In addition, for the direction of sunlight irradiation,
When the evaporating dishes are arranged in this order, the cooling cylinder and the water collecting gutter block sunlight to the evaporating dishes, and the heat collecting efficiency of the evaporating dishes is reduced. Furthermore, the greenhouse must be hermetically sealed in order to establish a saturated vapor pressure environment in the greenhouse. When the greenhouse is mounted on a moving body, vibration and deformation force act on the greenhouse, so that the hermeticity is impaired. Therefore, the present invention provides a small-sized stationary type for remote islands, a small watercraft, a high water-collection efficiency suitable for mounting on a moving body such as a life boat, energy saving, and an inexpensive desalination apparatus. As an issue.

[0004]

In a desalination apparatus comprising a greenhouse, a collecting gutter provided in the greenhouse, and an evaporating dish, cooling means for cooling the ceiling of the greenhouse, wherein the outer surface is washed with the pumped water.
A desalination apparatus is constituted by the water absorbing means provided in the evaporating dish, the cooling means, and the water pumping means for supplying raw water to the water absorbing means.

[0005]

[Function] The source water pumped by the water absorbing means heated by sunlight becomes steam and fills the greenhouse. The filled steam is condensed and dropped on the inner surface of the ceiling cooled by the cooling means for washing the outer surface with the pumped source water, becomes a fresh water droplet 7, is guided to the collecting trough 6, and is stored in the fresh water trough 9. .

[0006]

1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view. Hereinafter, embodiments will be described with reference to the drawings. Reference numeral 1 denotes a greenhouse having a trapezoidal cross section surrounded by a transparent plate made of glass, plastic, or the like. The ceiling 11 of the greenhouse 1 is provided with an inclination so as to be orthogonal to the irradiation direction of sunlight.
Note that the angle of inclination is sufficient as long as the source water, such as seawater or muddy water, naturally flows down the outer surface of the ceiling 11. It is to be noted that if a super-hydrophilic coating such as Hydrotect (trade name) or a water-repellent coating such as fluorine is applied to the inner and outer surfaces of the ceiling 11, it is possible to prevent the attachment of dirt and maintain the transmission efficiency of sunlight. At the top of the ceiling 11, a water storage tank 4 having both ends closed is provided. One end of the water storage tube 4 is connected to one end of an upper water sampling pipe 10. The other end of the upper water sampling pipe 10 is connected to the discharge side of the pump 8 having a capacity sufficient to cool the outer surface of the ceiling 11, and the suction side is connected to one end of the lower water sampling pipe 10. The other end of the lower water sampling pipe 10 is supplied below the surface of the original water such as seawater or muddy water. When the head and the flow rate can be secured, the pump 8 may be omitted, and the water sampling pipe 10 may be the capillary member 3 made of a thin tube such as a fiber string, stainless steel, or plastic. Further, a trumpet-shaped expanded portion is provided at the tip of the original water surface input portion of the water sampling pipe 10, and when the expanded portion is directed in the traveling direction, a dynamic pressure corresponding to the speed is obtained as a head. Here, the pumping means is
The pump 8, the capillary member 3, or the water sampling pipe 10 provided with the expanding section 21 is provided. A slit 41 is provided on the side surface on the top side of the ceiling 11 of the water storage tube 4 so that the original water accumulated in the water storage tube 4 flows out from the slit 41 so that the original water droplets 71 wash the outer surface of the ceiling 11. . A plurality of fins 13 are provided on the outer surface of the ceiling 11. The upper part of the fin 13 is covered with a cover 12 made of a transparent material, and the outer surface of the ceiling 11, the fin 13 and the cover 12 form a ventilation duct. The outside air rises in the ventilation duct as shown by arrows, and cools the outer surface of the ceiling 11, the fins 13 and the cover 12. Here, the cooling means is the outer surface of the ceiling 11, the fin 1
3. It is composed of the birch 12 and air or the outer surface of the ceiling 11, the fins 13 and the pumping means. At the bottom of greenhouse 1,
An evaporating dish 2 is provided. In the evaporating dish 2, a black sponge-like water-absorbing pad 21 that easily absorbs heat is spread. When the water absorbing pad 21 becomes clogged, it is washed with original water and reused. On the upper surface of the water absorbing pad 21, a fiber string,
One end of a capillary member 3 made of a thin tube of stainless steel, plastic, or the like is provided. The other end of the capillary member 3 is immersed below the surface of the raw water stored in the water storage tank 5, and the raw water such as seawater or muddy water is pumped to the evaporating dish 2 by a capillary phenomenon. The water storage tank 5 has an L-shaped gutter shape including the lower part of the side wall connected to the lower end of the ceiling 11 of the greenhouse 1 and the other end of the capillary member 3. At the lower end of the ceiling 11 of the evaporating dish 2, a water collecting gutter 6 for receiving fresh water droplets 7 dripping on the inner surface of the ceiling 11 is provided with a slight inclination toward the fresh water tub 9. Freshwater trough 9 with one end of 6 provided outside greenhouse 1
Then, fresh water is induced.

The raw water pumped by the water-absorbing pad 21 heated by sunlight turns into steam and fills the greenhouse 1. The filled steam condenses and drops on the inner surface of the ceiling 11 cooled by the pumped source water, becomes fresh water droplets 7, is guided to the collecting trough 6, and is stored in the fresh water trough 9.

[0008]

As described above, according to the present invention, the outer surface of the ceiling of the greenhouse is cooled by the pumped original water, and water droplets condensed on the inner surface are received by the collecting gutter. A small desalination apparatus can be configured. In addition, since a black sponge-like water-absorbing pad that easily absorbs heat is laid on the bottom of the evaporating dish, it can be easily cleaned when it becomes dirty. Furthermore, when a capillary member or a water sampling pipe provided with an expanded portion is used as a means for pumping the raw water, the water collection efficiency suitable for mounting on a moving body is high.
An energy-saving desalination device can be provided.

[0009]

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

[Explanation of symbols]

1 is a greenhouse, 11 is a ceiling, 12 is a hippo, 13 is a fin, 2
Is an evaporating dish, 21 is a water absorbing pad, 3 is a capillary member, 4 is a water reservoir, 41 is a slit, 5 is a water storage tank, 6 is a water collecting gutter, 7 is a true water drop, 71 is a raw water drop, 8 is a pump, and 9 is a pump. Freshwater trough, 10
Is a water sampling pipe.

Claims (3)

[Claims] 1. A desalination apparatus comprising a greenhouse, a water collecting gutter provided in the greenhouse, and an evaporating dish, wherein cooling means on a ceiling of the greenhouse for washing an outer surface with pumped original water; A desalination apparatus comprising: a water absorbing means provided; a cooling means; and a water pumping means for supplying raw water to the water absorbing means. 2. The desalination apparatus according to claim 1, wherein the inside and outside surfaces of the ceiling of the greenhouse are provided with a superhydrophilic or water-repellent coating. 3. The desalination apparatus according to claim 1, wherein said water pumping means comprises a capillary member.