JPH06158685A - Distilled water fabricating device - Google Patents

Abstract

PURPOSE:To efficiently fabricate distilled water without requiring any special power source or facility loads by fabricating distilled water from moist air by use of the thermal energy required for vaporizing liquefied natural gas. CONSTITUTION:A distilled water fabricating device 20 is provided somewhere in a pipe line 26 leading from a liquefied natural gas storage tank 22 to a gas utilization plant 24. Moist air flowing over the surface 28 of sea water is introduced through a fresh air inlet 40 and heated by means of a sunlight transmitting window 42 and a buffer plate 44 and then forms an ascending current, which then reaches an air circulating passage 38, where steam in the air is condensed by contact with an evaporator tube 46 through which low- temperature liquefied gas flows. Because the condensed water is obtained by condensing steam on the surface of sea water without taking air-polluting materials such as colloidal particles and a vapor of organic substances, it passes as distilled water. The condensed water obtained is collected in a tray 50 and then fed to a water collecting tank 52 and retained there.

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 distilled water,
In particular, the present invention relates to a distilled water production apparatus capable of efficiently producing distilled water by utilizing the heat of vaporization of liquefied natural gas (LNG).

[0002]

2. Description of the Related Art Generally, liquefied natural gas is transported by an LNG tanker 1 and stored in a tank 2 installed at a landing base, as shown in FIG. The liquefied gas in the storage tank 2 is supplied to the vaporizer 4 by the pipeline 3, vaporized there, and then transported to the power generation plant 5 and the city gas plant 6. As shown in FIG. 6, the vaporizer for vaporizing the liquefied gas injects the river water pumped up by the spray injection device 10 into the evaporator unit 9 including the evaporator tube 8 having the cooling fins 7, The liquefied gas flowing in the tube 8 is vaporized by heat exchange with river water, and the vaporized gas (NG) is taken out from the tube outlet.

[0003]

However, in the conventional vaporizer for liquefied natural gas, the liquefied gas at -160 ° C is kept at 0 ° C.
Although it evaporates by raising the temperature to a certain degree, it only drains the river water cooled by the heat of vaporization to the river, and there is a problem that the waste heat is not effectively used and the heat utilization efficiency is very poor. there were.

On the other hand, in the case of producing distilled water, conventionally known is a method of flash-evaporating seawater to obtain fresh water, and a desalination technique using a permeable membrane. All of these types of distilled water production methods require a special power source for supplying seawater, which is a raw material for distilled water, and in the former case, flash chambers must be formed in multiple stages. Even in such a case, a large number of permeable membrane facilities are required, and the facility burden is very high.

The present invention has been made by paying attention to the above-mentioned conventional problems, and requires a special power source and equipment burden while utilizing the vaporization process which is inevitably carried out to utilize liquefied natural gas. It is an object of the present invention to provide a distilled water production apparatus that can efficiently produce distilled water without using the above method.

[0006]

In order to achieve the above object, the apparatus for producing distilled water according to the present invention vaporizes liquefied gas supplied from a liquefied natural gas storage section by an evaporator, An apparatus for producing distilled water installed in a line for supplying to various plants, in which an air circulation passage having a water surface as a part of the passage is provided in a levitation housing arranged above water, and super water repellent is provided in this circulation passage. The evaporator tube coated with the material is arranged transversely, and a means for collecting condensed water is provided below the evaporator tube. The housing is provided with an outside air intake and a solar heat collecting means for heating the internal air. Condensed water is collected while the air in the circulation passage is circulated by temperature difference convection.

[0007]

According to the above construction, the moist air on the upper surface of water is introduced from the intake port of the housing and heated by the solar heat collecting means. An evaporator tube to which the liquefied gas is supplied is transversely arranged in the circulation passage through which the heated air passes, where heat exchange is performed, and steam in the air is condensed to produce distilled water. This can be taken in by water collecting means and stored in a water collecting tank or the like for proper use. The air cooled by heat exchange comes into contact with the water surface that is part of the circulation passage and contains water vapor, but due to the temperature difference with the air in the solar heat collecting means portion, it will circulate through the internal passage. . By repeating this, distilled water can be produced at the same time as the vaporizing action of the liquefied gas, and furthermore, air circulation can be performed without requiring a power source.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the distilled water producing apparatus according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of a distilled water producing apparatus according to an embodiment. This device 20 is installed in the middle of a pipeline 26 from a liquefied natural gas (LNG) storage tank 22 to a gas utilization plant 24 such as a power plant or a city gas plant, and vaporizes liquefied natural gas. Is performed to produce distilled water.

That is, the device 10 has a housing 30 as a floating structure which can float above the sea surface 28, and this has a barge portion 32 formed in a plane rectangular frame shape, and the inside thereof. The float chamber 34 is capable of holding the buoyancy and floating. This barge part 3
A housing body 36 is formed so as to cover the seawater surface 28 surrounded by 2, and is formed by an outer housing case 36A having a lower opening and the outer housing case 36A.
Closed inner housing case 3 formed in the center of
6B and 6B. Therefore, the inner and outer housing cases 36A and 36B are not provided inside the housing 30.
An annular passage defined by is formed and is used as the air circulation passage 38. As shown in FIG. 2, the air circulation passage 38 includes a pair of vertical side passages 38 _S1 , 38 _S2 , an upper passage 38 _U , and a lower passage 3.
It is composed of 8 _D. In this case, the lower passage 38 _D uses the sea surface 28 surrounded by the barge portion 32 as a part of the passage wall.

In such a housing 30, an outside air intake 40 is formed on one side of the barge portion 32 so as to connect the air circulation passage 38 to the outside.
It is possible to take in the moist air which flows along and contains a large amount of water vapor. Further, the side wall of the outer housing case 36A reaching the outside air intake 40 is configured as an inclined wall, and the solar transmission window 42 is formed on this inclined wall, and the side passage of the air circulation passage 38 facing the transmission window 42 is formed. 38 _S1
A plurality of buffer plates 44 composed of heat collecting plates are arranged in the portion. The sunlight transmitting window 42 is a buffer plate 44.
By installing a lens or the like for condensing light on each of the buffer plates 44 and forming each buffer plate 44 by a photoelectric heating element, the air passing through this portion can be heated more effectively. For this reason, the air is heated in the side passage 38 _S1 where the heating means using the sunlight is arranged and flows as an upward flow, so that the air introduced from the outside air intake port 40 is supplied to the buffer plate 44 side. Creates an upward flow towards.

On the other hand, the other side passage 3 located on the opposite side of the side passage 38 _S1 in which the solar heat utilizing heating means is arranged.
A liquefied gas evaporator tube 46, which is sent from the liquefied natural gas storage tank 22 via a pipeline 26, is arranged across 8 _S2 . That is, the header 48 is attached to the outer surface of the outer housing case 36A and the inside of the inner housing case 36B, and the evaporator tube 46 is connected so as to be connected between the both headers 48 and to traverse the air circulation passage 38. It is a thing. The liquefied gas supplied from the storage tank 22 is introduced into one of the headers 48, and the pipeline to the gas utilization plant 24 is connected to the other header 48.
Therefore, the evaporator tube 46 comes into contact with the air flowing through the air circulation passage 38, and the low temperature (−
It is possible to condense the water vapor contained in the air by exchanging heat with the liquefied gas (160 ° C.).

Since the liquefied gas has a low temperature and the condensate may freeze on the ice, in this embodiment, the tube 46 is coated with a super water repellent material. This may be constituted by further completely fluorinating the ends of a low molecular weight Teflon powder having an average particle size of 4 μm, dispersing it in a nickel bath containing a cationic surfactant, and coating by a dispersion plating method. As a result, the water droplets condensed on the tube 46 can be dropped before icing.

Tray 50 for collecting the condensed water to be dripped is arranged in multiple stages below the evaporator tube 46 as described above, and the condensed water collected by the tray 50 is used for the inner housing case 36B. A water collecting tank 52 installed inside is pumped via a pump 54 to store water.

A distilled water producing apparatus 20 having the above structure
According to, the moist air introduced from the outside air intake port 40, but reaches the side passage 38 _S1 of the first solar thermal heating means is equipped with an air circulation passage 38, the buffer plate 44 at the passageway 38 _S1 Because of the heating due to the contact, the air becomes an upward flow toward the upper passage 38 _U. The other side passage 3
At 8 _S2 , the evaporator tube 46 through which the low-temperature liquid gas flows
Water vapor in the air condenses on contact with. This condensed water is so-called distilled water because it condenses vapor on the sea surface without taking in air pollutants such as colloidal particles and organic vapor in the atmosphere. The condensed water thus obtained is collected in the lower tray 50 and sent to the water collecting tank 52 for storage. Also, the evaporator tube 46
The air that has passed through becomes dry air and reaches the lower passage 38 _D , but here it comes into contact with the sea surface 28 and contains vaporized vapor, so that the wet air introduced from the outside air intake 40 joins and re-airs. It circulates in the circulation passage 38. Since the air circulation is performed by the temperature difference, no special power is required.

It should be noted that if the sunlight transmitting window 42 formed in the housing 30 is made to always track the sunlight, the heat collection effect will be enhanced. This is because a motor utilizing the dynamic pressure of the vaporized gas of liquefied natural gas is used. The housing 30 may be operated by providing a screw directly connected to the screw as a propulsion source. Further, the upper housing main body 36 of the housing 30 may be configured to be rotatable with respect to the lower barge portion 32, and only the upper housing main body 36 may be made to perform the sun-tracking rotation.

If sunlight cannot be sufficiently collected by the device 20, the liquefied natural gas pipeline is switched and the conventional equipment for vaporization by being circulated to the evaporator by water injection is used. do it.

[0018]

As described above, according to the present invention,
A distilled water manufacturing apparatus installed in a line for vaporizing liquefied gas supplied from a storage unit for liquefied natural gas by an evaporator and supplying the vaporized gas to various plants, in a floating housing placed above water. An air circulation passage having a water surface as a part of the passage is provided in the air passage, and an evaporator tube coated with a superhydrophobic material is transversely arranged in the circulation passage, and condensed water collecting means is provided below the evaporator tube. Provided,
The housing is provided with an outside air intake port and a solar heat collecting means for heating the internal air, and is configured to collect condensed water while circulating the air in the circulation passage by a temperature difference convection, so that the liquefied natural gas is vaporized. Therefore, the distilled water can be produced from the moist air without using a special power source by effectively utilizing the necessary heat energy, and the distilled water can be efficiently produced by effectively utilizing the energy.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a distilled water producing apparatus according to an embodiment.

FIG. 2 is a sectional view of a housing of the device.

FIG. 3 is a plan view of the same.

FIG. 4 is a front view of the same.

FIG. 5 is an equipment configuration diagram showing a relationship between a conventional liquefied natural gas storage base and a utilization plant.

FIG. 6 is an explanatory diagram of a conventional liquefied natural gas vaporization facility.

[Explanation of symbols]

 20 Distilled Water Production Equipment 22 LNG Storage Tank 24 Gas Utilization Plant 26 Pipeline 28 Sea Surface 30 Housing 32 Barge 34 Float Chamber 36 Housing Main Body 38 Air Circulation Passage 40 Outside Air Intake 42 Sunlight Transmission Window 44 Buffer Plate 46 Evaporator Tube 48 Header 50 Water collecting tray 52 Water collecting tank 54 Pumping pump

Claims (1)

[Claims] 1. A distilled water producing apparatus installed in a line for vaporizing liquefied gas supplied from a liquefied natural gas storage section by an evaporator and supplying the vaporized gas to various plants, the apparatus being arranged on water. An air circulation passage having a water surface as a part of the passage is provided in the floating housing, and an evaporator tube coated with a super water-repellent material is transversely arranged in the circulation passage, and condensed water is provided below the evaporator tube. Water collecting means is provided, and the housing is provided with an outside air intake and a solar heat collecting means for heating the internal air to collect condensate water while circulating the air in the circulation passage by temperature difference convection. Distilled water production equipment.