KR20210158631A - Apparatus for treating water - Google Patents

Abstract

A water treatment device according to an embodiment of the present invention includes: a reaction chamber; an electrode unit installed in the reaction chamber and including first and second electrodes having different polarities; and a water jet device installed on the upper portion of the reaction chamber. The present invention can reduce water treatment costs.

Description

Water treatment equipment {APPARATUS FOR TREATING WATER}

The present invention relates to a water treatment device, and more particularly, to a water treatment device for treating seawater.

In order to maintain the pressure of the well during oil or gas production, water is injected. In the case of offshore production, seawater is treated and injected into the well. In this case, the water treatment includes treatment such as particle removal, microorganism removal, oxygen removal, and scale removal for the purpose of preventing corrosion, abrasion, and scale.

In addition, divalent cations in seawater, for example, negatively charged clay such as Ca2+, Mg2+, and oil are attracted to the oil and clay, so that the oil recovery efficiency is lowered.

Therefore, it is not easy to selectively remove only divalent cations in seawater to increase the efficiency of the recovered water, so a desalination process is performed. However, the desalination process mainly uses a method of lowering the salinity while pressurizing using reverse osmosis (RO). At this time, since seawater is injected into the RO package, it is mainly made of a material that is not corroded by seawater, for example, FRP, corrosion resistance alloy, etc., and the injected seawater is formed in several layers The salinity decreases as it passes through the RO membrane.

However, these materials, which do not cause corrosion of seawater, are expensive materials, increase material cost, and require power to continuously apply pressure. In addition, multiple layers of membranes are required, which makes the equipment complex and bulky.

Accordingly, the present invention is to provide a water treatment apparatus for seawater treatment that is safe from corrosion of seawater and inexpensive in material cost.

A water treatment apparatus according to an embodiment of the present invention includes a reaction chamber, an electrode unit installed in the reaction chamber and including first and second electrodes having different polarities, and a waterjet apparatus installed on the upper portion of the reaction chamber.

The first electrode and the second electrode may have a long rod shape in the depth direction of the reaction chamber.

The first electrode may be positioned at a center of the reaction chamber, and the second electrode may be disposed to surround the first electrode.

The waterjet apparatus may include a pipe arranged in a circle along an inner circumferential surface of the reaction chamber, and a plurality of nozzles connected to the pipe to spray high pressure water toward the first electrode or the second electrode.

The waterjet device may be installed to move the reaction chamber in a vertical direction.

As in an embodiment of the present invention, by using the electrochemical process, it is possible to selectively remove cations from seawater, thereby reducing the cost of water treatment.

In addition, it is possible to reduce the cost of manufacturing a water treatment device by not using an expensive corrosion-preventing material.

1 is a schematic diagram of a water treatment apparatus according to an embodiment of the present invention.
2 and 3 are diagrams for explaining the waterjet device included in FIG. 1 .
4 and 5 are views for explaining a water treatment apparatus according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

1 is a schematic diagram of a water treatment apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are views for explaining the waterjet apparatus included in FIG. 1 , and FIGS. 4 and 5 are another embodiment of the present invention It is a figure for demonstrating the water treatment apparatus according to an example.

As shown in FIG. 1 , the water treatment apparatus according to an embodiment of the present invention is connected to the reaction chamber 10 , the electrode unit 20 installed in the reaction chamber 10 , and the lower portion of the reaction chamber 10 . It includes a filtration device (30) located in the upper portion of the reaction chamber (10), a water jet (water jet) device (40) installed in the upper part.

The reaction chamber 10 provides a closed space in which a fluid is introduced and a reaction occurs, and an inlet 11 and outlet ports 12 and 13 through which the reaction fluid is introduced and discharged are connected to the reaction chamber 10 .

The inlet 11 may be located at the lower or lower side of the reaction chamber 10 , and the outlets 12 and 13 may be located at the bottom or lower side of the reaction chamber 10 and located lower than the inlet 11 .

The outlets 12 and 13 include a first outlet 12 and a second outlet 13, and a first outlet 12 through which the filtered seawater is discharged and a second outlet 13 through which the washing water is discharged. . At this time, the seawater may be discharged through the filtering device (30). The filtration device 30 may include a filter, a membrane, and the like, and may remove calcareous deposits generated after the reaction in the reaction chamber.

A gas, for example, hydrogen, may be generated according to a chemical reaction in the reaction chamber 10 , and the gas may be discharged through an exhaust pipe 51 installed at an upper portion of the reaction chamber 10 . A gas collection device 61 may be connected to the exhaust pipe 51 , and when hydrogen is discharged, the gas collection device 61 may be connected to the energy conversion device 62 . The energy conversion device 62 may generate electric energy by using the hydrogen gas collected in the collection device 61 as a fuel.

The electrode unit 20 includes a first electrode 21 and a second electrode 22 having different polarities, and the first electrode 21 may be an anode and the second electrode 22 may be a cathode. The first electrode 21 may be made of, for example, titanium oxide as an insoluble anode, and the second electrode 22 may be made of a metal such as iron.

The first electrode 21 and the second electrode 22 may have a long rod shape in one direction, that is, in the depth direction of the reaction chamber 10 . The first electrode 21 may be located in the center of the reaction chamber 10 , and a plurality of second electrodes 22 may be disposed at regular intervals and may be electrically connected to each other. The second electrode 22 may be disposed to surround the first electrode 21 .

The first electrode 21 and the second electrode 22 may have a T-type shape, a tube shape, or a mesh shape to increase a surface area as well as a plate shape or a cylindrical shape.

The electrode unit 20 may be connected to a motor 63 installed outside the reaction chamber 10 to rotate.

As in one embodiment of the present invention, when the first electrode 21 and the second electrode 22 are installed, the positive ions of seawater can be easily removed using an Impressed Current Cathodic Protection.

After filling the reaction chamber 10 with seawater, when a current flows through the first electrode 21 and the second electrode 22, the reactions of [Reaction Equation 1] and [Reaction Equation 2] occur in the seawater.

[Scheme 1]

H ₂ O + 1/2 O ₂ + 2e ^- →2OH ^-

[Scheme 2]

2H ₂ O + 2e ^- →2OH ^- + H ₂

At this time, the generated hydrogen is discharged to the outside through the upper part of the reaction chamber 10 and then collected in the collecting device 61 .

OH- generated in [Scheme 1] ^{reacts with Mg 2+ of} seawater as in [Scheme 3] to generate _{Mg(OH) 2} on the surface of the second electrode 22 .

Mg ²⁺ + 2OH ^- →Mg(OH) ₂ [Scheme 3]

Due to the generation of Mg(OH) ₂ , the pH of the surface of the second electrode 22 is changed, and accordingly Ca ²⁺ and CO ₃ ^2- of seawater react as shown in [Reaction Formula 4] to react with the surface of the second electrode 22 CaCo ₃ is formed in

Ca ²⁺ + CO ₃ ^2- → CaCO ₃ [Scheme 4]

_{Cations in seawater are converted to Mg(OH) 2} and CaCO ₃ through the above reaction formula, and by removing them, seawater from which cations are removed can be obtained. At this time, the cation concentration in the seawater may be measured through a concentration meter (not shown) installed in the reaction chamber 10 and then discharged.

_{Mg(OH) 2} and CaCO ₃ generated through the above reaction formula are attached to the surface of the electrode 20, and by these, further reaction may not proceed.

Accordingly, the surface of the electrode 20 may be cleaned through the waterjet device 40 . As long as the electrochemical reaction continues, corrosion does not occur even if there is no electrode surface deposit.

Cleaning may be performed when the surface of the second electrode 22, which is the cathode, is covered with a deposit so that the reaction rate is slowed beyond a certain level, or when the change in concentration measured by the concentration meter falls below a certain level.

The water jet device 40 cleans the surface of the electrode part 20 , and high-pressure washing water is sprayed on the surface of the electrode part 20 to separate the deposits from the surface of the electrode part 20 .

1 to 3 , the waterjet device 40 includes a pipe 41 through which water moves, and a plurality of nozzles 42 connected to the lower portion of the pipe and spraying water to the outside, and high-pressure washing water is supplied. and a high-pressure pump device 43 for

The pipe 41 is installed between the high-pressure pump device 43 and the nozzle 42 , and delivers the washing water supplied through the high-pressure pump device 43 to the nozzle 42 . The pipe 41 is circularly disposed along the inner circumferential surface of the reaction chamber 10 , and a plurality of pipes 41 may be disposed according to the arrangement of the second electrode 22 .

The nozzle 42 may be connected to the lower surface of the pipe 41 and installed so that the washing water can be sprayed onto the second electrode 22 .

The nozzle 42 may be located on an upper surface corresponding to the second electrode 22 , and the washing water may be sprayed on one side of the second electrode 22 while being spaced apart from each other by a predetermined distance. Although the nozzle 42 is located on one side of the second electrode 22 and is installed so that the washing water is sprayed in a direction parallel to the longitudinal direction of the second electrode 22, the present invention is not limited thereto. ) may be connected to the pipe 41 so that it can be sprayed obliquely (not shown) at a certain angle with respect to the side surface. As such, when the washing water is sprayed at an angle, the washing water is directly sprayed on the surface of the second electrode 22 and a greater impact is applied than when the washing water is sprayed in a direction parallel to the longitudinal direction of the second electrode 22, so that the deposition is easier to be separable.

In addition, as shown in FIGS. 4 and 5 , the waterjet device 40 may be installed to move in the vertical direction of the reaction chamber 10 without rotating unlike in FIGS. 1 to 4 . In this case, the pipe 41 is positioned between the adjacent electrodes, so that the electrodes are not disturbed when the pipe 41 moves.

When the waterjet device 40 is installed to move in the vertical direction, the nozzle 42 may be connected to the pipe 41 so that the washing water can be sprayed in a direction perpendicular to the surface of the second electrode 22 .

As such, when the washing water is vertically sprayed to the second electrode 22 , the washing water is sprayed with a stronger pressure on the surface of the second electrode 22 so that the deposits can be more easily separated.

_{Meanwhile, Mg(OH) 2} , CaCO ₃ generated by [Reaction Formula 3] and [Reaction Formula 4] may be deposited on the surface of the second electrode 22 .

_{Mg(OH) 2} , CaCO ₃ deposited on the surface of the second electrode 22 is discharged using the water jet device 40 after discharging seawater from the reaction chamber 10, or after injecting washing water into the electrode unit 20 can be removed by rotating the

When the electrode part 20 is rotated, the deposits deposited on the surface may be separated by the centrifugal force of seawater.

Since the waterjet device 40 sprays high-pressure water, the water sprayed from the nozzle is Mg(OH) ₂ , CaCO ₃ deposited on the surface of the second electrode 22 or the reaction chamber 10 by impacting them. to separate from the surface.

The separated sedimentation product may be discharged to the outside together with the washing water.

As such, using a water treatment device as in an embodiment of the present invention, cations can be easily removed from seawater, and deposits deposited in the reactor can be easily removed using a waterjet device.

In addition, it is possible to optimize the energy use of a ship by using hydrogen generated when seawater is treated using a water treatment device as energy.

Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and it is possible to carry out various modifications within the scope of the claims, the description of the invention, and the accompanying drawings, and this also It is natural to fall within the scope.

10: reaction chamber 20: electrode part
21: first electrode 22: second electrode
30: filtration device 40: water jet device
41: pipe 42: nozzle
61: collection device 62: energy conversion device
63: motor

Claims (5)

reaction chamber,
an electrode unit installed in the reaction chamber and including first and second electrodes of different polarities;
A water jet device installed in the upper part of the reaction chamber
A water treatment device comprising a. In claim 1,
The first electrode and the second electrode are a long rod-shaped water treatment device in the depth direction of the reaction chamber. In claim 1,
The first electrode is positioned at the center of the reaction chamber, and the second electrode is disposed to surround the first electrode. In claim 1,
The waterjet device includes a pipe disposed in a circle along the inner circumferential surface of the reaction chamber;
A water treatment apparatus including a plurality of nozzles connected to the pipe and spraying high-pressure water toward the first electrode or the second electrode. In claim 4,
The water jet device is a water treatment device in which the reaction chamber is installed to be movable in a vertical direction.

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