KR102389951B1 - Method for concentration of sea water - Google Patents

Abstract

The present invention relates to an evaporation field structure of a novel configuration capable of concentrating sea water to a desired salinity level in a relatively short time, thereby producing concentrated sea water in an economical manner, and to a sea water concentration method of a novel type using the same. According to the present invention, provided is an evaporation field structure and a sea water concentration method using the same, wherein in an evaporation field for concentrating sea water by natural evaporation, an absorbent member (12) is installed on the bottom of the evaporation field (10). Accordingly, when sea water supplied to the evaporation field (10) is naturally evaporated and concentrated, the absorbent member (12) is salted in the concentrated sea water. As such, when concentrated sea water is discharged to the outside and sea water is newly supplied to the evaporation field (10), the salinity of the newly supplied sea water is increased by the salted absorbent member (12).

Description

Method for concentration of sea water

The present invention relates to an evaporator structure and a seawater concentration method using the same, and more particularly, to a new evaporator structure capable of concentrating seawater to a desired level of salinity in a relatively short time, and a seawater concentration method using the same will be.

In general, salt fields that produce sea salt are composed of a reservoir that stores seawater, an evaporator that receives seawater from the reservoir and naturally evaporates the seawater to concentrate it, and a crystalline pond that additionally evaporates the concentrated seawater in the evaporator to make salt crystals. do.

Sea salt is produced by gradually concentrating seawater in these salt fields. Usually, salt crystallizes when seawater is concentrated to about 23-25% salinity. It takes quite a long time, and it takes about 25 days to finally obtain sea salt.

As such, it takes a very long time to concentrate seawater, so the productivity of sea salt is quite low. .

Republic of Korea Patent Registration No. 10-1704179 (2017. 02. 01) Republic of Korea Patent Registration No. 10-1319835 (2013. 10. 07) Republic of Korea Patent Publication No. 10-2020-0120141 (2020. 10. 21) Republic of Korea Patent Publication No. 10-2020-0049634 (2020. 05. 08) Republic of Korea Patent Registration No. 10-1253500 (2013. 04. 05)

The present invention has been proposed in view of the above points, and it is possible to concentrate seawater to a desired level of salinity in a relatively short time, so that it is possible to economically produce concentrated seawater with a new structure of an evaporator structure and a new method using the same. It is to provide a method of concentrating seawater.

According to a feature of the present invention, in an evaporator for naturally evaporating and concentrating seawater, an absorbent member 12 is installed at the bottom of the evaporator 10 so that the seawater supplied to the evaporator 10 is naturally evaporated. When concentrated, the absorbent member 12 is salted in the concentrated seawater, and after discharging the concentrated seawater to the outside, when seawater is newly supplied to the evaporator 10, the salinity of the freshly supplied seawater is changed to the salted absorbent member 12 ) is provided with an evaporator structure characterized in that it is raised by.

According to another feature of the present invention, the absorbent member 12 is made of any one of a cloth, a non-woven fabric, a sponge, a rope, and a woven mat.

According to another feature of the present invention, the absorbent member 12 is made of any one of a core mat (coir mat), jute mat, abaca mat (abaca mat).

According to another feature of the present invention, the first step of supplying seawater to the evaporator with an absorbent member on the bottom; a second step of concentrating the seawater supplied to the evaporator to a required level by natural evaporation, and allowing the absorbent member to be salted in the concentrated seawater;

a third step of discharging the seawater concentrated in the second step to the outside; a fourth step of newly supplying seawater to the evaporator; a fifth step of naturally evaporating the freshly supplied seawater in the fourth step and concentrating it to a required level; and a sixth step of discharging the seawater concentrated in the fifth step to the outside; in the fourth step, the salinity of the freshly supplied seawater is increased by the absorbent member salted in the seawater concentrated in the second step There is provided a seawater concentration method, characterized in that it becomes.

In the present invention having the above configuration, an absorbent member is laid on an evaporator, seawater is first concentrated, and the absorbent member is salted with concentrated seawater, and then the salinity of the seawater supplied to the evaporator is salted with concentrated seawater by supplying seawater to the evaporator. It is raised by an absorbent member. As described above, the salinity of the seawater supplied to the evaporation site is automatically increased without going through a separate natural evaporation process, so that the seawater can be concentrated relatively quickly.

Therefore, since seawater can be concentrated to a required level of salinity in a relatively short time, concentrated seawater can be manufactured more economically.

1 is a photograph of an evaporator according to a preferred embodiment of the present invention;
2 is a photograph of the absorbent member used in the above embodiment;

First, the advantages and features of the present invention, and a method for achieving them will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. Here, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and are common in the technical field to which the present invention pertains. Since it is provided by way of example so that those with knowledge of the present invention can clearly understand the scope of the invention, the technical scope of the present invention should be defined by the claims.

In addition, in the following description of the present invention, if it is determined that a detailed description of a well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. And, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary depending on the intentions or customs of users, operators, etc., of course. Therefore, the definition should be made based on the technical idea described throughout the description of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are photographs of a preferred embodiment of the present invention. The present invention relates to an evaporator for concentrating seawater, and as shown, an absorbent member 12 is installed in the evaporator 10 . In general, the evaporator is covered with a vinyl sheet or tiles on the floor, and in the evaporator 10 according to the present invention, the absorbent member 12 is additionally installed in the conventional evaporator.

The absorbent member 12 is made of a material capable of absorbing seawater supplied to the evaporator, and the absorbent member 12 is made of various types of materials that either have absorbency in themselves or have absorbency through pores formed in the tissue. is done The type of the absorbent member 12 that can be used is not particularly limited, but examples of some preferable examples include cloth, nonwoven fabric, sponge, rope, woven mat, and the like. The rope is rice straw, coconut shells, hemp, banana peels. It is made of vegetable fibers or synthetic fibers such as corn stalks and barley stalks, and the woven mat is woven with the same rope, cloth, or non-woven fabric as described above.

The absorbent member 12 is spread on the bottom of the evaporation paper 10, and when the absorbent member 12 is made of a relatively thin sheet such as cloth or nonwoven fabric, it is folded or wrinkled in several layers rather than spread out flat. As described later, the cloth or nonwoven fabric absorbs a relatively large amount of seawater so that it can be salted. And when a rope is used as the absorbent member 12, the rope is rolled or bent so that the rope can cover the entire bottom of the evaporation paper 10.

As described above, the types that can be used as the absorbent member 12 are not particularly limited, but a woven mat is preferably used as the absorbent member 12 . When the woven mat is used as the absorbent member 12, it is not only easy to install the absorbent member 12 in the evaporator 10, but also because the thickness of the mat is quite thick enough to absorb the concentrated seawater and effectively salt it.

As a woven mat particularly preferable to be used as the absorbent member 12, for example, a core mat made of coconut shell, a jute mat made of jute, an abaca mat made of manila hemp, etc. can This type of absorbent mat is harmless to the human body and does not cause environmental pollution, so it is environmentally friendly, has strong hygroscopicity and strength, and is not easily corrupted even when submerged.

Since the evaporator 10 according to the present invention has such an absorbent member 12 on the bottom, when the seawater is naturally evaporated and concentrated in the evaporator 10, the concentrated seawater is absorbed by the absorbent member 12 to absorb The member 12 is salted.

In this way, since the absorbent member 12 is in a salted state, the concentrated seawater is discharged to the outside, and when seawater is newly supplied to the evaporator 10, between the absorbent member 12 salted with the newly supplied seawater and the concentrated seawater. A kind of osmosis phenomenon occurs in the salinity between the freshly supplied seawater and the absorbent member 12, so that the salinity of the absorbent member 12 is lowered, but the salinity of the seawater is increased.

Since the salinity of the freshly supplied seawater is automatically increased by the absorbent member 12 salted with the concentrated seawater as described above, the time taken for concentrating the seawater to a required level of salinity is shortened. That is, seawater can be concentrated more quickly.

Hereinafter, a method of concentrating seawater using an evaporator having such a configuration will be described.

1) Step 1

The seawater stored in the reservoir is pumped and water is supplied to the evaporator 10 on which the absorbent member 12 is laid. At this time, as shown in FIGS. 1 and 2 , seawater is supplied to such an extent that the upper end of the absorbent member 12 laid on the evaporator 10 is slightly exposed. In this embodiment, the absorbent member 12 is exemplified as being made of a core mat.

2) Step 2

The seawater supplied to the evaporator 10 is naturally evaporated and concentrated. As the seawater is concentrated, the absorbent member 12 is salted in the concentrated seawater. In the case of producing sea salt with concentrated seawater, it is evaporated naturally for about 20 days to concentrate the seawater to a salinity of 24 to 25%.

3) Step 3

Concentrated seawater in the evaporator 10 is discharged to the outside. Even if the concentrated seawater of the evaporator 10 is discharged, the absorbent member 12 is maintained in a salted state in the concentrated seawater.

4) Step 4

Seawater is newly supplied to the evaporator 10 . Even in this step, seawater is supplied to such an extent that the upper end of the absorbent member 12 is slightly exposed.

When seawater is newly supplied to the evaporator 10, a kind of osmosis occurs between the freshly supplied seawater and the absorbent member 12 salted with concentrated seawater, as mentioned above, Instead of decreasing the salinity, the salinity of seawater increases. According to the experiment, when the absorbent member 12 is salted with seawater concentrated to a salinity of 24 to 25%, when seawater having a salinity of 2 to 2.3% is supplied, the salinity of the seawater is automatically increased to about 18 to 22%.

5) Step 5

The seawater supplied to the evaporator 10 is naturally evaporated and concentrated to a desired salinity. In the case of producing sea salt or sea salt, the seawater is concentrated to have a salinity of 24 to 25%.

Since the salinity of the freshly supplied seawater in the fourth step is elevated by the salted absorbent member 12, the seawater can be concentrated to a desired salinity in a relatively short time.

In the first step, it took about 20 days to concentrate the seawater to a salinity of 24 to 25%, but in the fourth step, the salinity is automatically increased to 18 to 22% as the seawater is supplied to the evaporation pond 10, so 20 days It is possible to concentrate seawater to a salinity of 24 to 25% in a significantly shorter time. According to the experiment, if seawater with a salinity of 18 to 22% is evaporated naturally for 2 to 5 days, the seawater can be concentrated to a salinity of 24 to 25%.

6) Step 6

The seawater concentrated in the fifth step is discharged to the outside.

On the other hand, the concentrated seawater discharged from the evaporator 10 is used for various purposes, such as sea salt or sea salt, a raw material for liquid salt, or an electrolyte for hydrogen production, and is post-treated in an appropriate way according to the use.

For example, in the case of making sea salt or salt produced by sea salt with concentrated seawater, the concentrated seawater is additionally evaporated to precipitate salt. Then, impurities in the concentrated seawater are filtered out and used as a raw material for liquid salt or as an electrolyte for hydrogen production.

7) Repeat steps 4 to 6

Repeat steps 4 to 6 to repeatedly produce concentrated seawater.

Experimental Example 1

A core mat was laid on the bottom of the 6m × 1m evaporator, and 200 liters of seawater with a salinity of 2% was supplied, and the seawater was concentrated by natural evaporation. The remaining concentrated seawater was 100ℓ, and the salinity was 24%.

Concentrated seawater was discharged to the outside, and 200 liters of seawater having a salinity of 2% was newly supplied to the evaporation pond. As a result of measuring the salinity of the seawater supplied to the evaporator, the salinity of the seawater was 20%. It can be inferred that the increase in the salinity of the freshly supplied seawater to 20% is due to the core mat salted with the concentrated seawater.

Then, the seawater was concentrated by natural evaporation for 3 days, and then the salinity of the concentrated seawater was measured. The salinity of the concentrated seawater was 24%. Seawater was harvested by sending concentrated seawater to the crystallizer and allowing it to evaporate naturally for 3 days.

As such, in Experimental Example 1, seawater was naturally evaporated for 3 days to produce concentrated seawater having a salinity of 24%, and the concentrated seawater was naturally evaporated for an additional 3 days to finally harvest sea salt in 6 days. As in this experimental example, when seawater concentration and salt crystallization are repeatedly performed at intervals of 3 days, salt production is possible at intervals of 3 days.

Sea salt can be harvested on average in about 3 to 5 days using the present invention. Considering that it usually takes about 25 days to harvest sea salt, using the present invention, sea salt can be harvested in a fairly short time.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains may make various substitutions, modifications, and changes within the scope not departing from the essential characteristics of the present invention. It will be easy to see that this is possible. That is, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments.

Accordingly, the protection scope of the present invention should be interpreted by the claims described below, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (4)

delete delete delete In the method of concentrating seawater,
A first step of supplying seawater to an evaporator with an absorbent member on the bottom;
a second step in which the seawater supplied to the evaporator is naturally evaporated and concentrated to a target level of salinity, and the absorbent member is salted with seawater concentrated to the target level of salinity;
In the second step, a third step of discharging seawater except for the salted seawater absorbed by the absorbent member to the outside;
A fourth step of balancing the salinity of the new seawater and the salted seawater to a salinity of 18 to 22% by osmotic pressure after the new seawater is supplied to the evaporator;
a fifth step of naturally evaporating the seawater equilibrated to a salinity of 18 to 22% in the fourth step and concentrating to a salinity of 24 to 25%; and
Seawater concentration method comprising a; a sixth step in which the seawater concentrated to a salinity of 24 to 25% in the fifth step is discharged to the outside.

Images