KR20190106449A - Apparatus for reducing air pollutant - Google Patents

Abstract

The present invention provides an apparatus for treating exhaust pollutants which reduces energy consumption. According to an embodiment of the present invention, the apparatus for treating exhaust pollutants comprises: a scrubber to receive cleaning water to bring exhaust gas supplied from a combustion engine and the cleaning water into contact with each other; an oxidation catalyst storage tank to store a solution containing an oxidation catalyst which is an inorganic metallic compound injected into the scrubber to oxidize the exhaust gas; a cleaning water storage tank which is connected to the scrubber, and stores the cleaning water and the oxidation catalyst discharged from the scrubber; a cleaning water circulation pipe to connect the cleaning water storage tank and the scrubber, and circulate a portion of a mixed solution of the cleaning water and the oxidation catalyst stored in the cleaning water storage tank to the scrubber; a neutralizing agent supply unit to supply a neutralizing agent to the cleaning water storage tank; a salt separation unit connected to the cleaning water storage tank to separate salt created as the cleaning water and the neutralizing agent react in the cleaning water storage tank from the cleaning water; and a plurality of ballast tanks wherein at least one thereof is connected to the salt separation unit to store salt separated from the cleaning water, and ballast water is stored in the remainder.

Description

Apparatus for reducing air pollutant}

The present invention relates to an apparatus for treating exhaust pollutants, and more particularly, to an apparatus for treating exhaust pollutants that can treat exhaust gases and cleaning water contaminated by purifying exhaust gases while reducing energy consumption.

In general, various engines installed on ships generate power by burning fuel, and exhaust gases generated during combustion of fuel are harmful substances such as nitrogen oxides (NOx), sulfur oxides (SOx), and fine dust (PM). It includes. As environmental awareness gradually increases, regulations on various harmful substances contained in exhaust gases are becoming more stringent. In particular, nitrogen oxides and sulfur oxides in the exhaust gases are regulated by the International Maritime Organization (IMO). Representative air pollutants are under emission control from Nitrogen oxides are regulated at 3.4 g / kwh or less in 2016, when Tier III takes effect, and sulfur oxides are below 0.1% in the Sulfur Emission Control Area (SECA) since 2015. This is regulated. Accordingly, various apparatuses and methods for treating exhaust gas of ships have been introduced. In the case of sulfur oxides, a method of removing by using a wet scrubber is common. When the exhaust gas is oxidized in advance using hydrogen peroxide, ozone, ultraviolet rays, etc., the sulfur oxides and nitrogen oxides are simultaneously reduced. Can be.

On the other hand, when sulfur oxides and nitrogen oxides are oxidized and dissolved in the washing water, sulfates and nitrates are produced. Since nitrates have been regulated in terms of the amount that can be discharged to sea, cleaning water containing more than a certain concentration of nitrates cannot be discharged. However, various engines installed on the ship continuously burn fuel to generate the required power, and thus sulfates and nitrates are continuously generated in the process of treating the exhaust gas, and thus, a plurality of tanks for storing them must be provided. do. Therefore, the cost for installing and maintaining the tank is increased, a large space is required to arrange a plurality of tanks, there is a problem that the space utilization in the vessel is lowered. Thus, after cooling the washing water to precipitate sulfate, only the washing water containing nitrate is stored, but there is a problem in that energy consumption is large in the process of forcibly cooling the washing water.

Republic of Korea Patent No. 10-1489657 (Nov. 26, 2014)

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an exhaust pollutant treatment apparatus capable of treating exhaust gas and washing water contaminated by purification of exhaust gas while reducing energy consumption.

Technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

Exhaust pollutant treatment apparatus according to an embodiment of the present invention for achieving the above technical problem, a scrubber that is supplied with the washing water to the gas-liquid contact with the exhaust gas supplied from the combustion engine, and injected into the scrubber to the exhaust gas An oxidation catalyst storage tank for storing a solution containing an oxidation catalyst which is an inorganic metal compound to oxidize, a washing water storage tank connected with the scrubber and discharged from the scrubber and storing the oxidation catalyst, and the washing water A washing water circulation pipe connecting the storage tank and the scrubber to circulate a portion of the mixed solution of the washing water and the oxidation catalyst stored in the washing water storage tank to the scrubber, and a neutralizing agent supply unit for supplying a neutralizing agent to the washing water storage tank. And connected to the washing water storage tank, the image inside the washing water storage tank. A salt separation unit for separating the salt produced by the reaction of the washing water and the neutralizing agent from the washing water, and at least one is connected to the salt separation unit to store the salt separated from the washing water, the balance water is stored It includes a plurality of ballast tanks.

The salt separation unit may include an ion exchange resin that is chemically adsorbed with the salt to separate the salt, or may include a capacitive deionizer that is electrically adsorbed with the salt to separate the salt.

The apparatus for treating exhaust pollutants may further include an oxidation catalyst separation unit which is installed in the washing water discharge pipe at the rear end of the salt separation unit and separates the oxidation catalyst from the mixed liquid by using a difference in specific gravity.

The exhaust pollutant treating apparatus further comprises an oxidation catalyst recovery pipe connecting the oxidation catalyst separation unit and the oxidation catalyst storage tank to recover the oxidation catalyst separated from the oxidation catalyst separation unit to the oxidation catalyst storage tank. can do.

The exhaust pollutant treating apparatus may further include a particle separation unit installed between the washing water storage tank and the salt separation unit to separate solid particles contained in the washing water.

The particle separation unit may be a cyclone-type centrifuge for receiving the washing water in a tangential direction.

The tank in which the salt is stored among the plurality of ballast tanks may be a tank located closest to the stern side of the hull.

According to the present invention, by separating the salt contained in the washing water contaminated by the purification of the exhaust gas and stored in at least one of the plurality of ballast tanks, a separate tank for storing the washing water containing salt or salt It does not need to be provided. Therefore, it is possible to reduce the cost for installing and maintaining a separate tank, it is also possible to increase the space utilization in the vessel.

In addition, since the salt is separated from the washing water by using chemical or electrical adsorption properties, it is possible to reduce the energy consumed than the conventional case of forcibly cooling the washing water containing salt to precipitate the salt.

1 is a view showing a marine structure to which the exhaust pollutant treatment apparatus according to an embodiment of the present invention is applied.
2 is a block diagram schematically illustrating an apparatus for treating exhaust pollutants.
3 and 4 are operation diagrams for explaining the operation of the exhaust pollutant treatment apparatus.
5 is a block diagram schematically illustrating an apparatus for treating exhaust pollutants in accordance with another embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, an exhaust pollutant treatment apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

1 is a view showing a marine structure to which the exhaust pollutant treatment apparatus according to an embodiment of the present invention is applied.

Exhaust pollutant treatment apparatus according to an embodiment of the present invention is a device for purifying the pollutants contained in the exhaust gas discharged from the combustion engine 100, and at the same time, the washing water contaminated by the purification of the exhaust gas, Primarily it can be mounted on offshore structures such as ships.

The exhaust pollutant treatment apparatus separates the salts contained in the washing water contaminated by purification of the exhaust gas and stores the salts in at least one of the plurality of ballast tanks 60, thereby storing the washing water containing salts or salts. It is not necessary to have a separate tank. Therefore, it is possible to reduce the cost for installing and maintaining a separate tank, it is also possible to increase the space utilization in the vessel. In addition, since the salt is separated from the washing water using chemical or electrical adsorption properties, there is a feature that can reduce the energy consumed than the conventional case of forcibly cooling the washing water containing salt to precipitate the salt.

Hereinafter, the exhaust pollutant treatment apparatus 1 will be described in detail with reference to FIG. 2.

2 is a block diagram schematically illustrating an apparatus for treating exhaust pollutants.

Exhaust pollutant treatment apparatus 1 according to the present invention is a scrubber 10, the oxidation catalyst storage tank 20, the washing water storage tank 30, the washing water circulation pipe 31, the neutralizing agent supply unit 40 And, the salt separation unit (50A, 50B), and a plurality of ballast tank (60).

The scrubber 10 is a gas-liquid contact with washing water supplied to the exhaust gas supplied from the combustion engine 100, and the exhaust gas pipe 110 and the washing water supply pipe 200 are connected to one side thereof.

Exhaust gas pipe 110 is a pipe for supplying the exhaust gas of the combustion engine 100 or the boiler (see 100 'of FIG. 1) mounted on the vessel, the end is connected to the scrubber (10). The exhaust gas pipe 110 may be directly connected to an exhaust port of the combustion engine 100 to directly move high-temperature exhaust gas, or may pass through a boiler 100 'or various heat exchangers to recycle most of the exhaust heat and move the remaining waste gas. Here, the combustion engine 100 is a device that generates various powers required for a ship by burning fuel, and may be formed of, for example, a main engine or a generator. When the combustion engine 100 is a main engine generating thrust required for the propulsion of the ship, it may be disposed on the stern side close to the propeller (see t in FIG. 1). The exhaust gas pipe 110 may be connected to the exhaust ports of the plurality of combustion engines 100, and the plurality of combustion engines 100 may be selectively operated. Since the combustion engine 100 usually generates power by burning fossil fuel, the combustion engine 100 generates exhaust gas according to the combustion of the fossil fuel. The generated exhaust gas contains a large amount of nitrogen oxides, sulfur oxides, organic materials, fine dust, and the like, and is supplied to the scrubber 10 through an exhaust gas pipe 110 connected to one side of the combustion engine 100.

The washing water supply pipe 200 is a pipe for supplying the washing water, which is at least one of sea water or fresh water, or a mixture of sea water and fresh water, to the scrubber 10, one end of which is a sea water inlet (not shown) and a fresh water storage tank (not shown). And the other end is connected to the scrubber 10. That is, the washing water supply pipe 200 may be selectively supplied with sea water and fresh water and supplied to the scrubber 10.

The scrubber 10 sprays the washing water supplied through the washing water supply pipe 200 to the gas gas supplied through the exhaust gas pipe 110 to make gas-liquid contact. The scrubber 10 is provided with a spray nozzle 13 for spraying the washing water in the form of fine particles therein, the plurality of spray nozzles 13 may be arranged along the flow direction of the exhaust gas branched into a plurality. Since the plurality of injection nozzles 13 are disposed along the flow direction of the exhaust gas, the contact area and the number of contact of the exhaust gas and the washing water are increased, so that nitrogen oxides, sulfur oxides, organic substances, fine dust, etc. contained in the exhaust gas are increased. Can be effectively removed. Exhaust gas from which pollutants such as nitrogen oxides, sulfur oxides, organic materials, and fine dusts are removed is discharged to the outside through the exhaust pipe 120. Exhaust gas discharged through the exhaust pipe 120 may be released to the atmosphere as the pollutant is removed to a level suitable for exhaust standards.

The scrubber 10 includes a first scrubber 11 and a second scrubber 12.

The first scrubber 11 is a cylindrical member forming one side of the scrubber 10, the upper portion may be in communication with the exhaust gas pipe (110). As the upper portion of the first scrubber 11 communicates with the exhaust gas pipe 110, the exhaust gas introduced into the first scrubber 11 flows downward and comes into gas-liquid contact with the washing water. At this time, since the solution containing the oxidation catalyst is injected from the oxidation catalyst storage tank 20 into the scrubber 10, the exhaust gas can also be oxidized in gas-liquid contact with the oxidation catalyst. When the exhaust gas is oxidized, nitrogen monoxide contained in the exhaust gas may be oxidized to nitrogen dioxide. Nitrogen dioxide is more easily dissolved in water than nitrogen monoxide, so that it can be easily dissolved and removed when contacted with the washing water in the scrubber 10. The oxidation catalyst injected from the oxidation catalyst storage tank 20 is a mixture of an inorganic metal compound such as Co (OH) / SiO ₂ and an organic compound including an organic sulfoxide, which oxidizes exhaust gases and prevents reverse reactions. have. In other words, the inorganic metal compound of the oxidation catalyst oxidizes the exhaust gas, and the organic compound prevents the reverse reaction. Artificially oxidized exhaust gas can be easily reduced back to its original state. When the exhaust gas is reduced again, it is not easily dissolved and removed in the washing water, thereby oxidizing the exhaust gas using an oxidation catalyst and preventing reverse reaction. Can be. The oxidation catalyst is a form in which transition metal hydroxides supported on silica nanoparticles are suspended in organic compounds including water and organic sulfoxides. The transition metals are cobalt, ikel, copper, iron, manganese, chromium, rhodium, ruthenium, molybdenum, Osmium, platinum, tungsten, zinc, vanadium, zirconium, palladium, iridium may be at least one. These oxidation catalysts react with oxygen to produce free radicals, which can oxidize nitrogen monoxide to nitrogen dioxide.

Inside the first scrubber 11, the stirring panel 14 and the mixer 15 may be installed as necessary. The stirring panel 14 induces a rotational flow of the exhaust gas, and the mixer 15 mixes the washing water, the oxidation catalyst, and the exhaust gas. Since the exhaust gas rotated by the stirring panel 14 and mixed with the washing water and the oxidation catalyst by the mixer 15, contaminants contained in the exhaust gas can be more effectively removed, and the temperature of the exhaust gas is lowered. The flow rate and volume of the exhaust gas can be reduced. It is also possible to prevent some of the exhaust gases from flowing back in the opposite direction to the flow due to the pressure difference when mixing the exhaust gases having different pressures from each other. In the drawings, the injection nozzle 13, the stirring panel 14, and the mixer 15 are sequentially arranged in the first scrubber 11 along the flow direction of the exhaust gas, but the present invention is not limited thereto. Can be modified. The first scrubber 11 is in communication with the second scrubber 12.

The second scrubber 12 is a cylindrical member forming the other side of the scrubber 10, the lower side is in communication with the first scrubber 11 to form a deflection portion, the upper side may be in communication with the exhaust pipe 120. That is, the exhaust gas flowing downward along the first scrubber 11 and flowing into the second scrubber 12 flows upward and is discharged through the exhaust pipe 120. As the second scrubber 12 communicates with the first scrubber 11 to form a U-shaped refraction portion, the flow path of the exhaust gas inside the scrubber 10 is long, and the time that the exhaust gas and the washing water contact each other extends and contaminates. The reduction effect of the material can be maximized. The second scrubber 12 has a mixer 15 and an injection nozzle 13 disposed therein, and a droplet separator 16 for condensing the water particles contained in the exhaust gas may be installed at an upper portion contacting the exhaust pipe 120. have. The droplet separator 16 is installed on the second scrubber 12 to remove moisture particles from the exhaust gas containing moisture particles in contact with the washing water and discharge the exhaust gas through the exhaust pipe 120 in a state where the exhaust gas is dried. Can be. In addition, the moisture particles removed from the exhaust gas may come into gas-liquid contact with the exhaust gas flowing upwardly while falling, thereby further removing contaminants.

The washing water inside the scrubber 10 is discharged through the washing water discharge pipe 17. The washing water discharge pipe 17 is connected to the refraction portion between the first scrubber 11 and the second scrubber 12 to discharge the washing water inside the scrubber 10. The washing water discharge pipe 17 is connected to the washing water storage tank 30.

The washing water storage tank 30 is connected to the scrubber 10 to store the washing water and the oxidation catalyst discharged from the scrubber 10, and an agitator (not shown) may be provided therein as necessary. As described above, since the oxidation catalyst is in a form in which the transition metal hydroxide supported on the silica nanoparticles is suspended in organic compounds including water and organic sulfoxides, the oxidation catalyst has a difference in specific gravity from the washing water when stored in the washing water storage tank 30. Due to phase separation. When the stirrer is provided in the washing water storage tank 30, the oxidation catalyst may be prevented from being separated from the washing water, and may be mixed with the washing water even if the washing liquid is separated. The washing water storage tank 30 may be connected to the washing water circulation pipe 31 and the neutralizer supply part 40 at one side thereof.

The washing water circulation pipe 31 is a pipe connecting the washing water storage tank 30 and the scrubber 10, and circulates a part of the mixed solution of the washing water and the oxidation catalyst stored in the washing water storage tank 30 to the scrubber 10. You can. Part of the mixed solution of the washing water and the oxidation catalyst is circulated to the scrubber 10 through the washing water circulation pipe 31, thereby reducing the amount of the washing water and the oxidation catalyst that must be supplied from the outside for purification of the exhaust gas. You can save money.

The neutralizing agent supply unit 40 supplies a neutralizing agent to the washing water storage tank 30 and neutralizes the acidified washing water by dissolving nitrogen oxide and sulfur oxide in contact with the exhaust gas. For example, the neutralizing agent is an alkaline solution such as sodium hydroxide (NaOH) or sodium hypochlorite (NaOCl) or aqueous ammonia, and can be obtained by electrolyzing seawater or the like. The neutralizer supply unit 40 may simply be a tank in which the neutralizer is stored, or may be a device that directly produces the neutralizer including an electrolysis device. The neutralizing agent supply unit 40 supplies the neutralizing agent to neutralize the acidified washing water, so that the hydrogen ion concentration index (pH) of the washing water may be adjusted. In the washing water storage tank 30 or the scrubber 10, a sensor (not shown) for measuring the pH of the washing water may be installed, and the neutralizing agent supply unit 40 adjusts the amount of neutralizing agent supplied in association with the sensor. Can be. The neutralizer supplied from the neutralizer supply unit 40 reacts with the pollutants of the exhaust gas dissolved in the washing water to form sulfate (Na ₂ SO ₄ ) and nitrate (NaNO ₃ ). That is, the washing water stored in the washing water storage tank 30 is in a state in which dissolved pollutants react with the neutralizing agent to contain salts, and part of the washing water is circulated to the scrubber 10 through the washing water circulation pipe 31. A part is moved to the salt separation units 50A and 50B through the washing water discharge pipe 17.

The salt separation units 50A and 50B are connected to the washing water storage tank 30 through the washing water discharge pipe 17 to wash the salts generated by the reaction between the washing water and the neutralizing agent in the washing water storage tank 30. Separate from. More specifically, the salt separation units 50A and 50B may separate nitrates contained in the washing water. By separating the salts contained in the washing water by the salt separation units 50A and 50B, the nitrates can be discharged within a range that satisfies the regulation on the amount of nitrates that can be discharged to the sea. The salt separation units 50A and 50B may include an ion exchange resin that is chemically adsorbed with salt ions to separate salts, or may include a capacitive deionizer that is electrically adsorbed with salt ions to separate salts. Hereinafter, the structure of the salt separation unit 50A, 50B including the ion exchange resin will be described more focusing.

The salt separation units 50A and 50B include an ion exchange resin 50a for chemically adsorbing salts to separate salts, and a chamber 50b in which the ion exchange resins 50a are accommodated. That is, the salt separation units 50A and 50B may be formed in a shape in which a plurality of ion exchange resins 50a are accommodated in the chamber 50b. The ion exchange resin 50a is an insoluble synthetic resin capable of exchanging ions of molecules, and may be formed in the form of a plastic ball. More particularly, the ion-exchange resin (50a) is formed by anion exchange resin (anion exchange resin), a nitrate contained in the washing water (NaNO ₃₎ of the nitrate ions ^- it could be removed by adsorbing the (NO _3, inorganic nitrate) have. In other words, nitrate (NaNO ₃₎ is sodium ion (Na ⁺⁾ and nitrate ions (NO ₃ ^-) in the washing water there is dissolved in the form, of nitrate ion (NO ₃ ^-), the same polarity of the ion exchange resin (50a Is adsorbed and separated. When nitrate ions (NO ₃ ⁻ ) are adsorbed onto the ion exchange resin (50a), the hydroxide ions (OH ⁻ ) bound to the surface of the ion exchange resin (50a) are desorbed, and the desorbed hydroxide ions (OH ⁻ ) are sodium. It can be combined with ions (Na ⁺ ) to produce sodium hydroxide (NaOH). By generating sodium hydroxide, the washing water can be kept in a neutralized state.

The salt separation unit 50A, 50B may be formed in plural numbers and connected to the washing water storage tank 30 in parallel. When the salt separation units 50A and 50B are used for a long time, nitrate ions (NO ₃ ⁻ ) may be excessively adsorbed on the surface of the ion exchange resin 50a, thereby lowering the adsorption capacity of the ion exchange resin 50a. A plurality of salt separation units (50A, 50B) are connected in parallel to the washing water storage tank 30, it is possible to selectively operate the plurality of salt separation units (50A, 50B) and to continuously separate salts.

Salt separation units (50A, 50B) of the adsorption capacity of the ion exchange resin (50a) is reduced is supplied to the ion exchange resin (50a) by receiving seawater through the regeneration water supply pipe 51 branched from the washing water supply pipe (200) Nitrate ions (NO ₃ ⁻ ) can be released. One side of the regeneration water supply pipe 51 may be connected to the neutralizer supply unit 40 to receive seawater and neutralizer at the same time. Chlorine ions (Cl ⁻ ) of seawater (NaCl) or hydroxide ions (OH ⁻ ) of neutralizing agent (NaOH) supplied through the regeneration water supply pipe 51 are adsorbed onto the ion exchange resin 50a having the same polarity. When chlorine ion (Cl ⁻ ) or hydroxide ion (OH ⁻ ) is adsorbed on the ion exchange resin (50a), the nitrate ion (NO ₃ ⁻ ) bound to the surface of the ion exchange resin (50a) is desorbed and the denitrated nitric acid is desorbed. Ions (NO ₃ ⁻ ) may be combined with sodium ions (Na ⁺ ) to produce nitrates (NaNO ₃ ). The nitrate (NaNO ₃ ) or highly concentrated nitrate (NO ₃ ⁻ ) solution thus produced may be stored in at least one of the plurality of ballast tanks 60. That is, nitrate ions (NO ₃ ⁻ ) included in the washing water discharged from the washing water storage tank 30 to form nitrate (NaNO ₃ ) are adsorbed on the ion exchange resin 50a and separated from the washing water, and ion exchange is performed. Nitrate (NaNO ₃ ) produced during the regeneration of the resin (50a) is stored in the ballast tank (60).

A plurality of ballast tanks 60 are provided in the hull for maintaining the equilibrium of the ship, and at least one of the plurality of ballast tanks 60 is connected to the salt separation units 50A and 50B to separate salt from the washing water. The ballast water may be stored, and the ballast water may be stored. At this time, the tank is connected to the salt separation unit (50A, 50B) to store the salt may be a tank located closest to the stern side of the hull. As described above, when the combustion engine 100 is the main engine generating the thrust, the scrubber 10 which is disposed on the stern side close to the propeller t and receives the exhaust gas from the combustion engine 100 is also the stern side. Can be placed in. The salt separation unit (50A, 50B) is connected to the ballast tank (60) located closest to the stern side, the washing water discharge pipe (17) connecting the washing water storage tank 30 and the salt separation unit (50A, 50B) And, the length of the pipe connecting the salt separation unit (50A, 50B) and the ballast tank (60) can be formed short. Therefore, the cost accordingly can be reduced, and the exhaust pollutant treatment apparatus 1 can be miniaturized.

Meanwhile, a particle separation unit 80 may be installed between the washing water storage tank 30 and the salt separation units 50A and 50B. The particle separation unit 80 may be a cyclone-type centrifuge which removes the solid particles contained in the washing water and receives the washing water in a tangential direction and centrifugally separates the washing water. That is, when the washing water containing the solid particles in the particle separation unit 80 is supplied in the tangential direction, the solid particles and the washing water from which the solid particles are removed by the density difference are separated. The solid particles contained in the washing water contain contaminants contained in the exhaust gas, and thus may be sticky due to high viscosity. If this is not removed in advance, the washing water discharge pipe 17 and the salt separation unit 50A, 50B), and may accumulate inside various devices, causing pipe blockage, corrosion, device failure, and the like. To prevent this, the particle separation unit 80 is installed to remove solid particles, and the solid particles separated from the particle separation unit 80 may be discharged to the sludge tank 81. Solid particles stored in the sludge tank 81 may be diluted with seawater or fresh water and discharged to the sea within the discharge standard when the vessel is out of the regulated sea area. The washing water from which the solid particles are removed from the particle separation unit 80 is moved to the salt separation units 50A and 50B.

In addition, an oxidation catalyst separation unit 70 is provided in the washing water discharge pipe 17 at the rear end of the salt separation units 50A and 50B. The mixed solution of the washing water and the oxidation catalyst in which the salts are separated from the salt separation units 50A and 50B is supplied to the oxidation catalyst separation unit 70 through the washing water discharge pipe 17, and the oxidation catalyst separation unit 70 differs in specific gravity. The oxidation catalyst can be separated from the mixed liquid using The oxidation catalyst separation unit 70 may be formed of a conventional gravity separator. As described above, the oxidation catalyst is in a form in which the transition metal hydroxide supported on the silica nanoparticles is suspended in the mixture containing water and the organic sulfoxide, and thus the specific gravity is greater than that of the washing water. Therefore, when the mixed solution of the washing water and the oxidation catalyst is supplied to the oxidation catalyst separation unit 70, the oxidation catalyst having a relatively high specific gravity sinks down to separate the washing water and the oxidation catalyst. The separated oxidation catalyst may be supplied to the oxidation catalyst storage tank 20 through the oxidation catalyst recovery pipe 71.

The oxidation catalyst recovery pipe 71 connects the oxidation catalyst separation unit 70 and the oxidation catalyst storage tank 20 to recover the oxidation catalyst separated from the oxidation catalyst separation unit 70 to the oxidation catalyst storage tank 20. Can be. The oxidation catalyst recovery tube 71 is connected to the lower portion of the oxidation catalyst separation unit 70, and at least one pump is installed to smoothly recover the oxidation catalyst to the oxidation catalyst storage tank 20.

The washing water from which the oxidation catalyst is separated from the oxidation catalyst separation unit 70 may be discharged to the sea through the discharge pipe 72 or used for various needs.

Hereinafter, the operation of the exhaust pollutant treatment apparatus 1 will be described in more detail with reference to FIGS. 3 and 4.

3 and 4 are operation diagrams for explaining the operation of the exhaust pollutant treatment apparatus.

Exhaust pollutant treatment apparatus 1 according to the present invention by separating the salt contained in the washing water contaminated by the purification of the exhaust gas and stored in at least one of the plurality of ballast tanks 60, salt or salt is included It is not necessary to provide a separate tank for storing the washed water. Therefore, it is possible to reduce the cost for installing and maintaining a separate tank, it is also possible to increase the space utilization in the vessel. In addition, since the salt is separated from the washing water by using the chemical adsorption characteristics, it is possible to reduce the energy consumed than the conventional case of forcibly cooling the washing water containing salt to precipitate the salt.

3 and 4 are views illustrating a process of selectively operating a plurality of salt separation units including an ion exchange resin to separate nitrate ions contained in the washing water.

First, referring to FIG. 3, the exhaust gas flowing through the exhaust gas pipe 110 is supplied to the scrubber 10, and the scrubbing water flowing into the sea water inlet or stored in the fresh water storage tank is scrubber (through the washing water supply pipe 200). 10). At this time, the oxidation catalyst storage tank 20 injects a solution containing an oxidation catalyst, which is a mixture of an inorganic metal compound and an organic compound, into the scrubber 10 to oxidize the exhaust gas and simultaneously reduce the oxidized exhaust gas. Reverse reaction can be prevented. The scrubber 10 removes contaminants such as nitrogen oxides, sulfur oxides, organic substances, and fine dust contained in the exhaust gas by gas-liquid contacting the exhaust gas with the washing water and the oxidation catalyst. It is discharged through the exhaust pipe (120).

The washing water containing contaminants such as nitrogen oxides, sulfur oxides, organic substances, and fine dust by gas-liquid contact with the exhaust gas is stored in the washing water storage tank 30 through the washing water discharge pipe 17. The washing water stored in the washing water storage tank 30 may be neutralized to an appropriate pH by the neutralizing agent supplied from the neutralizing agent supply unit 40. The neutralizer reacts with nitrogen oxides and sulfur oxides to produce sulphates and nitrates, which may be included in the wash water in a solid or liquid state. A portion of the washing water containing salt is circulated to the scrubber 10 through the washing water circulation pipe 31, and the other portion moves to the particle separation unit 80 through the washing water discharge pipe 17. The particle separation unit 80 separates the solid particles contained in the washing water, and the solid particles separated from the washing water are stored in the sludge tank 81.

The washing water from which the solid phase particles are separated is moved to any one of the salt separation units 50A and 50B, and the salt separation unit 50A to which the washing water is supplied separates salts, particularly nitrates, contained in the washing water. The ion exchange resin 50a included in the salt separation unit 50A adsorbs and separates the nitrate ions dissolved in the washing water. As the nitrate ions are adsorbed, the hydroxide ions that are bound to the ion exchange resin 50a are separated and combined with the sodium ions, whereby sodium hydroxide may be produced. The washing water is moved to the oxidation catalyst separation unit 70 with nitrate ions separated and containing sodium hydroxide, and the oxidation catalyst separation unit 70 separates the oxidation catalyst contained in the washing water. The oxidation catalyst separated from the oxidation catalyst separation unit 70 is recovered to the oxidation catalyst storage tank 20 through the oxidation catalyst recovery pipe 71.

The washing water from which the oxidation catalyst is separated from the oxidation catalyst separation unit 70 is discharged to the sea through the discharge pipe 72 or used for various needs.

On the other hand, the salt separation unit 50B not supplied with the washing water may be closed or may be supplied with the mixed solution of seawater or seawater and neutralizing agent through the regeneration water supply pipe 51.

Subsequently, referring to FIG. 4,

When the salt separation unit 50A is used for a long time, nitrate ions may be excessively adsorbed on the surface of the ion exchange resin 50a, thereby lowering the adsorption capacity of the ion exchange resin 50a. The salt separation unit 50A in which the adsorption capacity of the ion exchange resin 50a is lowered does not receive the washing water from the washing water storage tank 30, but supplies the seawater or the mixed solution of the seawater and the neutralizing agent through the regeneration water supply pipe 51. The nitrate ions adsorbed onto the ion exchange resin 50a can be desorbed. Chlorine ions of the seawater or neutralized ions of the neutralizing agent supplied through the regeneration water supply pipe 51 are adsorbed to the ion exchange resin 50a having the same polarity, and thus, nitrate ions bound to the surface of the ion exchange resin 50a are absorbed. It is detached. The desorbed nitrate ions may be combined with sodium ions to form nitrate, and the formed nitrate or highly concentrated nitrate (NO ₃ ⁻ ) solution is stored in the ballast tank 60.

Meanwhile, while the regeneration process is performed in the salt separation unit 50A, the remaining salt separation unit 50B may be supplied with the washing water from the washing water storage tank 30 to separate nitrates contained in the washing water.

Hereinafter, referring to FIG. 5, an exhaust pollutant treatment apparatus 1 according to another embodiment of the present invention will be described in detail.

5 is a block diagram schematically illustrating an apparatus for treating exhaust pollutants in accordance with another embodiment of the present invention.

Exhaust pollutant treatment apparatus 1 according to another embodiment of the present invention includes a capacitive deionization device in which the salt separation units 50A, 50B separate salts by using an electrical adsorption characteristic. Exhaust pollutant treatment apparatus 1 according to another embodiment of the present invention described above, except that the salt separation unit (50A, 50B) includes a capacitive deionization device for separating the salt by using the electrical adsorption characteristics, It is substantially the same as the embodiment. Therefore, while focusing on this, unless otherwise stated, the description of the remaining components will be replaced by the above description.

The salt separation units 50A and 50B include a capacitive deionizer which electrically adsorbs salts to separate salts. That is, the salt separation units 50A and 50B may be formed in a form including a pair of porous electrodes 50c and a power supply unit 50d which gives a potential difference between the porous electrodes 50c. When the power supply unit 50d gives a potential difference between the porous electrodes 50c, one of the porous electrodes 50c becomes an anode, and the other porous electrode 50c becomes a cathode. In this state, when rinsing water containing nitrate is supplied, sodium ions (Na ⁺ ) in the nitrate are adsorbed to the porous electrode 50c serving as the cathode, and nitrate ions (NO ₃ ⁻ ) are supplied to the porous electrode 50c serving as the anode. Can be adsorbed.

When the salt separation units 50A and 50B are used for a long time, nitrate ions (NO ₃ ⁻ ) may be excessively adsorbed on the surface of the porous electrode 50c, thereby lowering the adsorption capacity of the porous electrode 50c. When the adsorption capacity of the porous electrode 50c is lowered, when the potential of the porous electrode 50c is reversed while supplying fresh water through the regeneration water supply pipe 51, the nitrate ions electrically adsorbed to the porous electrode 50c (NO ₃₎ ^- ) May be detached to restore the porous electrode 50c to its initial state. Fresh water containing nitrate ions (NO ₃ ⁻ ) removed during the regeneration of the porous electrode 50c is stored in the ballast tank 60.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

1: exhaust pollutant treatment unit
10: scrubber 11: first scrubber
12: 2nd scrubber 13: injection nozzle
14: stirring panel 15: mixer
16: droplet separator 17: washing water discharge pipe
20: oxidation catalyst storage tank 30: washing water storage tank
31: washing water circulation pipe 40: neutralizer supply unit
50A, 50B: salt separation unit 50a: ion exchange resin
50b: chamber 50c: porous electrode
50d: power supply unit 51: renewable water supply pipe
60: ballast tank 70: oxidation catalyst separation unit
71: oxidation catalyst recovery pipe 72: discharge pipe
80: particle separation unit 81: sludge tank
100: combustion engine 110: exhaust gas pipe
120: exhaust pipe 200: washing water supply pipe

Claims (7)

A scrubber that is supplied with washing water to gas-liquid contact with exhaust gas supplied from a combustion engine;
An oxidation catalyst storage tank storing a solution containing an oxidation catalyst which is an inorganic metal compound injected into the scrubber to oxidize the exhaust gas;
A washing water storage tank connected to the scrubber and storing the washing water and the oxidation catalyst discharged from the scrubber;
A washing water circulation pipe connecting the washing water storage tank and the scrubber and circulating a portion of a mixture of the washing water and the oxidation catalyst stored in the washing water storage tank to the scrubber;
A neutralizer supply unit supplying a neutralizer to the washing water storage tank;
A salt separation unit connected to the washing water storage tank and separating the salt generated by the washing water and the neutralizing agent in the washing water storage tank from the washing water; And
At least one is connected to the salt separation unit to store the salt separated from the washing water, the remainder comprises a plurality of ballast water tank is stored ballast water. According to claim 1, wherein the salt separation unit,
An apparatus for treating exhaust pollutants comprising an ion exchange resin for chemically adsorbing salts to separate salts, or a capacitive deionizer for electrically adsorbing salts to separate salts. The exhaust pollutant treatment apparatus according to claim 2, further comprising an oxidation catalyst separation unit which is installed in the washing water discharge pipe after the salt separation unit and separates the oxidation catalyst from the mixed liquid by using a specific gravity difference. The exhaust gas according to claim 3, further comprising an oxidation catalyst recovery pipe connecting the oxidation catalyst separation unit and the oxidation catalyst storage tank to recover the oxidation catalyst separated from the oxidation catalyst separation unit to the oxidation catalyst storage tank. Pollutant Disposal System. The apparatus of claim 1, further comprising a particle separation unit installed between the washing water storage tank and the salt separation unit to separate solid particles contained in the washing water. The apparatus of claim 5, wherein the particle separation unit is a cyclone-type centrifuge that receives the washing water in a tangential direction and centrifugally separates the washing water. The apparatus of claim 1, wherein the tank in which the salt is stored among the ballast tanks is a tank located closest to the stern side of the hull.

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