KR102334645B1 - Apparatus for reducing water and air pollutant - Google Patents

Abstract

An apparatus for reducing exhaust and drainage pollutants is provided by an embodiment of the present invention.
An exhaust and drainage pollutant reduction device according to an embodiment of the present invention includes an exhaust gas pipe for supplying exhaust gas of a combustion engine, a washing water supply pipe for supplying washing water, and a washing water supply pipe for exhaust gas flowing through the exhaust gas pipe A scrubber that sprays the washing water supplied through It may include a washing water discharge pipe for discharging water.

Description

Apparatus for reducing water and air pollutant

The present invention relates to an exhaust and drainage pollutant reducing device, and more particularly, to an exhaust and drainage pollutant reducing device capable of killing and discharging pollutants included in exhaust gas of a combustion engine and microorganisms included in seawater will be.

In general, various engines installed in ships generate power by burning fossil fuels. At this time, the exhaust gas generated during the combustion process of fuel contains harmful substances such as sulfur oxides (SOx), nitrogen oxides (NOx), and fine dust (PM). may cause contamination.

In addition, the ship stores ballast water in a ballast tank provided on the hull to maintain balance and draft. Since ballast water is discharged to the sea of the destination after being filled in the sea of the origin, it may cause water pollution and changes in the marine ecosystem if discharged without a separate water treatment.

For this reason, environmental regulations for air pollution and water pollution of ships are being strengthened, and various treatment devices are being applied to ships to satisfy various regulations. Among the environmental regulations on air pollution, regulations stipulating that sulfur oxides contained in exhaust gases emitted from engines during operation and anchoring of marine emission control areas (ECA) are in effect at 0.1% or less. In general, a wet scrubber is used to remove the cargo. Wet scrubber removes sulfur oxides by gas-liquid contact between seawater, fresh water, or alkaline solution and exhaust gas. In addition, among environmental regulations related to water pollution, regulations that must kill microorganisms of a certain size or larger included in the ballast water of a ship are in effect, and treatment methods such as electrolysis, ozone, and ultraviolet rays are used for sterilization of microorganisms.

However, the conventional system is inefficient because the system for purifying exhaust gas and the system for treating ballast water operate independently, and not only increases the installation and maintenance cost of the system, but also requires a large installation space for the arrangement of the system There is a problem in that space utilization in the ship is lowered due to the demand.

Republic of Korea Patent Publication No. 10-2014-0123665 (2014. 10. 23)

An object of the present invention is to provide an exhaust and drainage pollutant reduction device capable of discharging by killing pollutants included in exhaust gas of a combustion engine and microorganisms included in seawater.

The 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 and drainage pollutant reduction apparatus according to an embodiment of the present invention for achieving the above technical problem is an exhaust gas pipe for supplying exhaust gas of a combustion engine, a washing water supply pipe for supplying washing water, and the exhaust gas pipe introduced through the exhaust gas pipe A scrubber that sprays the washing water supplied through the washing water supply pipe to the exhaust gas to be used, and the exhaust gas pipe or connected to the scrubber to oxidize nitrogen oxides or neutralize the acidified washing water or microorganisms contained in seawater It includes a dying purification unit, and a washing water discharge pipe for discharging the washing water inside the scrubber.

The purification unit may atomize and spray the liquid oxidizing agent to the exhaust gas pipe.

The purification unit may oxidize nitrogen monoxide contained in the exhaust gas passing through the exhaust gas pipe to nitrogen dioxide.

The exhaust and drainage pollutant reduction device may further include a circulation pipe connecting the washing water discharge pipe and the washing water supply pipe.

The exhaust and drainage pollutant reduction device may further include a filter unit connected to the washing water discharge pipe to separate solid particles contained in the washing water that has passed through the scrubber.

The washing water supply pipe may be branched from a seawater supply pipe that receives seawater from the outside and supplies ballast water to the ballast tank.

The exhaust and drainage pollutant reduction device may further include a control valve that connects the seawater supply pipe and the washing water supply pipe and adjusts the amount or ratio of seawater branched to the washing water supply pipe.

The exhaust and drainage pollutant reduction device may further include a fresh water supply pipe connected to the washing water supply pipe to supply fresh water.

The washing water discharge pipe is connected to the seawater supply pipe, and the washing water that has passed through the scrubber is supplied to the ballast water tank through the seawater supply pipe, or mixed with the seawater supplied through the seawater supply pipe. It can be discharged to the outside again.

The seawater supply pipe may be branched into a ballast water supply pipe for supplying the ballast water to the ballast water tank and a seawater discharge pipe for discharging seawater to the outside.

The purification unit may inject a neutralizing agent or a sterilizing agent into the seawater supply pipe or the scrubber or the ballast water tank.

According to the present invention, seawater in which microorganisms have been killed while passing through the wet scrubber system can be supplied to the ballast water tank and used as ballast water. Accordingly, a separate ballast water treatment system for sterilizing microorganisms included in the ballast water is omitted. That is, since the filtration device, the sterilizer, etc. included in the conventional ballast water treatment system can be omitted, the installation and maintenance cost of the system can be reduced, and the space utilization in the ship can be increased. In addition, since it can be implemented by adding only a pipe in the conventional wet scrubber system, it can be easily applied to an existing vessel.

In addition, by oxidizing nitrogen monoxide through the purification unit, at the same time neutralizing the acidified washing water, and sterilizing microorganisms in the seawater, there is an advantage in reducing costs and utilizing space.

1 is a view schematically showing an exhaust and drainage pollutant reduction device according to an embodiment of the present invention.
2 to 7 are operational diagrams of an exhaust and drainage pollutant reduction device according to an embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, an apparatus for reducing exhaust and exhaust pollutants according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7 .

1 is a diagram schematically illustrating an exhaust and drainage pollutant reduction apparatus according to an embodiment of the present invention.

The exhaust and drainage pollutant reduction device 1 according to an embodiment of the present invention reduces the concentration of various pollutants (nitrogen oxide, sulfur oxide, dust, etc.) contained in exhaust gas to discharge air suitable for exhaust standards. It is a device that can be used as ballast water or discharged into seawater by simultaneously sterilizing microorganisms contained in seawater. The exhaust and drainage pollutant reduction device 1 is mainly mounted on a ship and can simultaneously kill microorganisms included in seawater used as ballast water while removing pollutants from exhaust gas generated from the ship. In addition, the exhaust and drainage pollutant reduction device 1 can operate the pollutant removal function of the exhaust gas and the microbial killing function of the ballast water, respectively, or adjust the operating ratio as needed, included in the conventional ballast water treatment system There is an advantage that the old sterilizer can be removed. Since this device can be implemented by adding only a pipe in the conventional wet scrubber system, it has a feature that can be easily applied to an existing vessel.

Exhaust and drainage pollutant reduction device (1) according to the present invention includes an exhaust gas pipe (10), a washing water supply pipe (20), a scrubber (40), a purification unit (50), and a washing water discharge pipe (41) do.

The exhaust gas pipe 10 is a pipe through which exhaust gas from the combustion engine moves and is connected to the scrubber 40 . The exhaust gas pipe 10 is directly connected to the exhaust pipe of the combustion engine so that the high-temperature exhaust gas directly moves or passes through various heat exchangers to recycle most of the exhaust heat and the remaining waste gas can be a passage.

Here, the combustion engine is a device for generating various types of power required for a ship by burning fuel, and may be formed of, for example, a main engine, a generator engine, or the like. Exhaust pipes of a plurality of combustion engines may be connected to the exhaust gas pipe 10 , and the plurality of combustion engines may selectively operate as needed.

These combustion engines generally generate power by burning fossil fuels, and thus generate exhaust gas according to the combustion of fossil fuels. The generated exhaust gas contains a large amount of nitrogen oxides, sulfur oxides and dust, and is supplied to the scrubber 40 through the exhaust gas pipe 10 connected to one side of the combustion engine.

On the other hand, the washing water supply pipe 20 is a pipe for supplying washing water, which is at least one of seawater or fresh water or mixed water of seawater and fresh water, to the scrubber 40, and one end is connected to the seawater supply pipe 30 or the fresh water supply pipe 21. connected and the other end may be connected to the scrubber 40 . That is, the washing water supply pipe 20 may selectively receive seawater and fresh water.

Hereinafter, the washing water is mainly limited to seawater, and a process in which seawater is mainly introduced through the washing water supply pipe 20 and supplied to the scrubber 40 will be mainly described.

A pump 36 is installed in the seawater supply pipe 30 to smoothly supply the washing water to the scrubber 40 . In particular, the washing water supply pipe 20 is branched from the seawater supply pipe 30 and connected to the scrubber 40, and a control valve 31 is installed at the connection part of the washing water supply pipe 20 and the seawater supply pipe 30. have. The control valve 31 regulates the amount of seawater supplied through the washing water supply pipe 20 or supplies seawater branched to the washing water supply pipe 20 and the ballast water tank 60 through the seawater supply pipe 30 . The proportion of seawater can be adjusted.

The scrubber 40 is a device for gas-liquid contact between the exhaust gas and the washing water by spraying the washing water supplied through the washing water supply pipe 20 to the exhaust gas flowing through the exhaust gas pipe 10, and may be a conventional wet scrubber. have. At this time, the cleaning water supply pipe 20 has an end located inside the scrubber 40 disposed above the scrubber 40, and may be branched into a plurality to spray the washing water in the form of fine particles. That is, the washing water supply pipe 20 disposed on the upper portion of the scrubber 40 sprays the washing water toward the lower portion of the scrubber 40 where the exhaust pipe 42 is located, thereby effectively bringing the exhaust gas into contact with the washing water. As the exhaust gas and the washing water come into contact with the scrubber 40 inside the scrubber 40, pollutants such as nitrogen oxides, sulfur oxides, and dust included in the exhaust gas may be removed, and the exhaust gas from which pollutants such as nitrogen oxides, sulfur oxides and dust are removed The gas (refer to G2 of FIG. 4 ) may be discharged to the outside through a separate discharge pipe 42 . The exhaust gas G2 discharged through the discharge pipe 42 is removed from pollutants such as nitrogen oxides, sulfur oxides, and dust, so that it meets the exhaust standards and can be discharged into the atmosphere as it is.

Washing water containing nitrogen oxides, sulfur oxides, dust, etc. in contact with the exhaust gas containing contaminants inside the scrubber 40 is discharged through the washing water discharge pipe 41 .

The purification unit 50 is connected to the exhaust gas pipe 10 or the scrubber 40 to oxidize nitrogen oxides by a physical or chemical method, neutralize the acidified washing water, or kill microorganisms contained in the washing water. have. The purification unit 50 may supply an oxidizing agent, a neutralizing agent, or a sterilizing agent to the exhaust gas pipe 10 or the scrubber 40 . For example, the purification unit 50 may be a device that electrolyzes seawater to produce all of an oxidizing agent, a neutralizing agent, and a sterilizing agent, or a device that produces an oxidizing agent and a sterilizing agent using plasma. The purification unit 50 is not limited to an electrolysis device or a plasma device, and any configuration is possible as long as it is a device capable of oxidizing nitrogen oxides, neutralizing acidified washing water, or killing microorganisms contained in washing water. will be.

The purification unit 50 may oxidize nitrogen monoxide contained in the exhaust gas to nitrogen dioxide by injecting an oxidizing agent to the exhaust gas pipe 10 . Nitrogen dioxide is easily dissolved in water compared to nitrogen monoxide, so it can be easily removed by dissolving in the washing water in the scrubber 40 . The purification unit 50 may atomize the liquid oxidizing agent to the exhaust gas pipe 10 and spray it. The purification unit 50 may atomize the liquid oxidizing agent to the exhaust gas pipe 10 and directly spray it, or may spray the liquid oxidizing agent into the exhaust gas through a separate spray unit 11 installed in the exhaust gas pipe 10 .

At this time, the purification unit 50 may spray the neutralizing agent together on the exhaust gas pipe 10 or spray the neutralizing agent on the scrubber 40 . The neutralizing agent may neutralize the acidified washing water by reacting nitrogen oxides and sulfur oxides with the washing water. Since nitrogen oxides and sulfur oxides react with seawater to generate nitric acid (HNO3) and sulfuric acid (H2SO4), respectively, the purification unit 50 sprays sodium hypochlorite (NaOCl) to the scrubber 40 to remove the acidified washing water. neutralize

The purification unit 50 may neutralize the ballast water by spraying the neutralizing agent to the ballast water tank 60 or by spraying the neutralizing agent to the seawater discharge pipe 37 . On the other hand, the purification unit 50 can directly inject the neutralizing agent (NaOH) into the scrubber 40, and when the neutralization of the washing water with the purification unit 50 is not sufficient, a separate neutralizing agent injection unit (not shown) In addition, a secondary neutralization step may be performed.

The washing water discharge pipe 41 is a pipe for discharging the washing water inside the scrubber 40 and may be connected to the seawater supply pipe 30 again through the filter unit 70 . That is, the washing water discharge pipe 41 may be stored in the ballast water tank 60 or discharged to the outside after separating the solid particles through the filter unit 70 . The washing water discharge pipe 41 does not necessarily need to be connected to the seawater supply pipe 30 and may be independently connected to the ballast water tank 60 or connected to the outside of the ship.

A circulation pipe 91 may be connected to the washing water discharge pipe 41 . The circulation pipe 91 is for recirculating the washing water discharged through the washing water discharge pipe 41 to the washing water supply pipe 20. It can be continuously used by circulating it to the scrubber 40.

A recirculation tank 90 may be installed between the washing water discharge pipe 41 and the circulation pipe 91 . The recirculation tank 90 may store some of the washing water discharged through the scrubber 40 , and may serve as a kind of buffer tank so that a certain amount of washing water can be circulated through the circulation pipe 91 .

The recirculation tank 90 may include any one of a centrifuge, a gravity separator, and a filter like the filter unit 70 to remove solid particles contained in the washing water and recirculate the washing water through the circulation pipe 91 . .

The washing water supply pipe 20 is connected to the seawater supply pipe 30, the fresh water supply pipe 21 and the circulation pipe 91, so that the concentration of the exhaust gas, the treatment capacity of the scrubber 40, the concentration of the washing water and the degree of contamination, etc. In consideration of this, seawater, fresh water, and circulating water may be appropriately mixed and supplied to the scrubber 40 .

The filter unit 70 is installed at the rear end of the scrubber 40 and separates solid particles contained in the washing water discharged from the scrubber 40. A centrifugal separator, a gravity separator, and a filter using at least one of a solid phase The particles may be separated and discharged to the sludge tank 80 . The filter unit 70 may be connected to the seawater supply pipe 30 between the pump 36 and the control valve 31 . That is, seawater supplied from the seawater supply pipe 30 passes through the filter unit 70 and is supplied to the scrubber 40 , and the washing water that has passed through the scrubber 40 may again pass through the filter unit 70 . That is, it is possible to filter both the seawater introduced from the outside and the washing water that has passed through the scrubber 40 with one filter unit 70 . In addition, a merging pipe (see 38 of FIG. 6 ) directly connected to the seawater supply pipe 30 at the rear end of the control valve 31 may be installed on one side of the filter unit 70 .

The neutralizing agent or sterilizing agent supplied from the purification unit 50 may be sprayed to the washing water or seawater that has passed through the filter unit 70 . A mixing pipe 34 through which mixed water of seawater and washing water is discharged may be installed between the filter unit 70 and the seawater discharge pipe 37 , and a neutralizing agent or disinfectant supplied from the purification unit 50 to the mixing pipe 34 . An injection unit 33 for injecting may be installed. The injection unit 33 may inject a neutralizing agent or a sterilizing agent into seawater and washing water in a liquid or gaseous state.

A sensor unit 32 is installed at the rear end of the injection unit 33, and the total residual oxidant, pH concentration, microorganism concentration, etc. in the washing water and seawater discharged through the mixing pipe 34 are monitored in real time. can be grasped as According to the result of the sensor unit 32, the purification unit 50 appropriately adjusts the supply amount of the oxidizing agent, neutralizing agent, and sterilizing agent.

Washing water and seawater discharged through the mixing pipe 34 are introduced into the ballast water tank 60 or discharged to the outside.

The ballast water tank 60 stores the washing water discharged through the washing water discharge pipe 41 to maintain the equilibrium of the ship. At least one ballast water tank 60 may be installed in the ship, and as described above, the washing water discharged through the washing water discharge pipe 41 absorbs nitrogen oxides, sulfur oxides, dust, etc. contained in the exhaust gas. In one state, the hydrogen ion concentration index, ie, the pH value, of the washing water flowing inside the washing water discharge pipe 41 is lower than the pH value of the washing water flowing inside the washing water supply pipe 20 . In other words, the washing water flowing inside the washing water discharge pipe 41 is acidified due to the sulfur oxide, and thus has a lower PH value than the washing water flowing through the washing water supply pipe 20 . Therefore, the survival rate of microorganisms contained in the washing water flowing through the washing water discharge pipe 41 is lower than the survival rate of microorganisms included in the washing water flowing through the washing water supply pipe 20 .

That is, the washing water flowing through the washing water discharge pipe 41 has a low survival rate of microorganisms due to acidification, and thus satisfies the ballast water regulation condition in which microorganisms of a certain size or larger must be killed, so it is suitable for use as ballast water. By using the washing water in which the microorganisms discharged from the scrubber 40 are dead as ballast water, a separate ballast water treatment system for killing microorganisms can be omitted, thereby reducing the installation and maintenance cost of the system However, the space utilization within the ship may increase. In addition, since it can be implemented by adding only a pipe in the conventional wet scrubber system, there is an advantage that can be easily applied to an existing vessel.

Meanwhile, the purification unit 50 may supply the sterilizing agent directly to the ballast water tank 60 . When the concentration of microorganisms in the ballast water stored in the ballast water tank 60 is high, the concentration of microorganisms can be controlled by directly spraying the sterilizing agent into the ballast water tank 60 . Therefore, before discharging the ballast water stored in the ballast water tank 60 to the outside, it can be adjusted within the microbial permissible standard value, thereby preventing marine pollution or disturbance of the ecosystem.

Hereinafter, an operation process of the exhaust and drain pollutant reduction device 1 will be described in more detail with reference to FIGS. 2 to 7 .

2 and 3 show a process in which seawater introduced through the seawater supply pipe 30 is supplied to ballast water, and FIG. 2 is a direct sterilization method in which a sterilizing material is injected into the entire seawater supplied to ballast water. 3 shows an indirect sterilization method in which a sterilizing material is added to a portion of seawater supplied to ballast water and mixed with seawater supplied from the outside.

First, referring to FIG. 2 , the seawater supplied through the seawater supply pipe 30 passes through the filter unit 70 , and microorganisms with large particles are removed. For example, the filter unit 70 may separate microorganisms having a diameter of 50 μm or more that are not easily killed with a sterilizing material.

The sterilizing agent supplied from the purification unit 50 may be injected into the seawater that has passed through the filter unit 70 . The seawater in which the microbes are killed by spraying the disinfectant may be supplied to the ballast water tank 60 to be used as ballast water.

Next, referring to FIG. 3 , the seawater supplied through the seawater supply pipe 30 passes through the filter unit 70 , and microorganisms with large particles are removed, and some of the seawater is discharged through the mixing pipe 34 , The remainder may be discharged through the bypass pipe (35). The mixing pipe 34 is a pipe through which the disinfectant is injected from the purification unit 50 , and the bypass pipe 35 is a pipe through which seawater passing through the filter unit 70 directly flows into the ballast water tank 60 .

The seawater that has passed through the mixing pipe 34 is in a state in which microorganisms including the sterilizing agent are killed, and when the seawater that has passed through the mixing pipe 34 and the seawater that has passed through the bypass pipe 35 is mixed with each other, it passes through the bypass pipe 35 . It can also kill all microorganisms contained in one seawater.

The amount or ratio of seawater passing through the mixing pipe 34 and the bypass pipe 35 may be selectively adjusted according to the concentration of microorganisms contained in the seawater.

As described with reference to FIGS. 2 and 3 , the exhaust and drainage pollutant reduction device 1 can independently treat ballast water even without using a function to remove exhaust gas.

Hereinafter, a process in which the pollutant reduction device 1 operates to remove only pollutants from exhaust gas will be described with reference to FIGS. 4 and 5 .

4 shows a method in which the seawater supplied to the seawater supply pipe 30 is directly discharged to the outside through the scrubber 40, and FIG. 5 shows the seawater introduced into the seawater supply pipe 30 passes through the scrubber 40. It shows a method to be reused by recirculating through the circulation pipe 91 after doing so.

First, referring to FIG. 4 , the seawater introduced through the seawater supply pipe 30 is supplied to the scrubber 40 through the washing water supply pipe 20 . The washing water may be sprayed from the upper portion of the scrubber 40 and the lower portion of the scrubber 40 may be filled with the washing water to a predetermined level.

In this case, the exhaust gas supplied through the exhaust gas pipe 10 may be injected from the lower portion of the scrubber 40 . The purification unit 50 may oxidize nitrogen monoxide to nitrogen dioxide by spraying an oxidizing agent before the exhaust gas is supplied to the scrubber 40 . The purification unit 50 may spray the neutralizing agent together to the exhaust gas pipe 10 or the scrubber 40 in consideration of the pH value of the washing water.

On the other hand, the exhaust gas may be sprayed in the washing water filled in the lower part of the scrubber 40, and the scrubber 40 first removes contaminants such as nitrogen oxides, reduced oxides, and dust from the washing water filled in the lower part of the scrubber 40, and then 40) Contaminants can be removed again by the washing water sprayed from the top. Through this process, pollutants inside the exhaust gas are removed, and the exhaust gas from which the pollutants are removed is discharged to the outside through the exhaust port 42 .

The washing water passing through the scrubber 40 contains contaminants such as nitrogen oxides, sulfur oxides, and dust, and moves to the filter unit 70 through the washing water discharge pipe 41 . The filter unit 70 separates contaminants such as solid particles in the washing water and stores it in the sludge tank 80 , and the clean washing water is discharged to the outside through the mixing pipe 34 and the seawater discharge pipe 37 . At this time, when the pH value of the washing water passing through the mixing pipe 34 deviates from the standard value, the purification unit 50 injects a neutralizing agent into the mixing pipe 34 to bring the pH value to within the standard value and then discharges to the outside.

5, the seawater introduced through the seawater supply pipe 30 passes through the scrubber 40 and is discharged to the washing water discharge pipe 41, and the washing water discharged to the washing water discharge pipe 41 is recycled. It is temporarily stored in the tank 90 and then circulated back to the washing water supply pipe 20 through the circulation pipe 91 . That is, the process of FIG. 5 is substantially the same as the process of FIG. 4 except that the washing water is recycled and reused through the circulation pipe 91 .

The seawater introduced through the seawater supply pipe 30 circulates sequentially through the washing water supply pipe 20, the scrubber 40, the washing water discharge pipe 41, and the circulation pipe 91, taking into account the contamination level of the seawater, the pH value, etc. Accordingly, the process of FIG. 5 and the process of FIG. 4 may be performed in parallel. The process of FIG. 5 can be used when seawater cannot be discharged to the outside, such as when passing through an area where the discharge of seawater is restricted, and the filter unit ( 70), the solid particles are removed and discharged to the outside, and new seawater can be supplied to the scrubber 40 again.

The processes of FIGS. 4 and 5 may be used selectively or sequentially as needed.

Hereinafter, a process in which the pollutant reduction device 1 simultaneously performs the pollutant removal and ballast water treatment of the exhaust gas will be described with reference to FIGS. 6 and 7 .

6 shows the ballast water treatment process of the open loop type pollutant removal method and the direct sterilization method, and FIG. 7 is the equilibrium between the closed loop type pollutant removal method and the indirect sterilization method The water treatment process is shown.

First, referring to FIG. 6 , the seawater introduced through the seawater supply pipe 30 is supplied to the scrubber 40 through the washing water supply pipe 20 . The washing water may be sprayed from the upper portion of the scrubber 40 and the lower portion of the scrubber 40 may be filled with the washing water to a predetermined level.

In this case, the exhaust gas supplied through the exhaust gas pipe 10 may be injected from the lower portion of the scrubber 40 . The purification unit 50 may oxidize nitrogen monoxide to nitrogen dioxide by spraying an oxidizing agent before the exhaust gas is supplied to the scrubber 40 . The purification unit 50 may inject a neutralizing agent together into the exhaust gas pipe 10 or the scrubber 40 in consideration of the pH value of the washing water.

On the other hand, the exhaust gas may be sprayed in the washing water filled in the lower part of the scrubber 40, and the scrubber 40 first removes contaminants such as nitrogen oxides, reduced oxides, and dust from the washing water filled in the lower part of the scrubber 40, and then 40) Contaminants can be removed again by the washing water sprayed from the top. Through this process, pollutants inside the exhaust gas are removed, and the exhaust gas from which the pollutants are removed is discharged to the outside through the exhaust port 42 .

The washing water passing through the scrubber 40 contains contaminants such as nitrogen oxides, sulfur oxides, and dust, and moves to the filter unit 70 through the washing water discharge pipe 41 . The filter unit 70 separates contaminants such as solid particles in the washing water and stores it in the sludge tank 80, and the clean washing water passes through the seawater supply pipe 30 and the mixing pipe 34 to the ballast water tank ( 60) or may be discharged to the outside through the seawater discharge pipe (37). At this time, the seawater introduced from the outside that did not pass through the scrubber 40 through the merging pipe 38 installed on one side of the filter unit 70 joins the seawater supply pipe 30, and flows the seawater supply pipe 30. It can also be mixed with clean washing water.

Meanwhile, the disinfectant supplied from the purification unit 50 through the injection unit 33 may be injected into the mixed water of the washing water and seawater flowing through the seawater supply pipe 30 .

Next, referring to FIG. 7 , the seawater introduced through the seawater supply pipe 30 is supplied to the scrubber 40 through the washing water supply pipe 20 . Some of the washing water that has passed through the scrubber 40 is recirculated to the scrubber 40 through the recirculation tank 90, the circulation pipe 91, and the washing water supply pipe 20, and the remaining part is the filter unit 70. can move That is, in the process of FIG. 7 , some of the washing water that has passed through the scrubber 40 is recirculated to the scrubber 40 through the recirculation tank 90 , the circulation pipe 91 , and the washing water supply pipe 20 , except that , the rest of the process is substantially the same as that of FIG. 6 .

On the other hand, the seawater flowing through the seawater supply pipe 30 is injected with a disinfectant by the injection unit 33, and the remaining part flows along the bypass pipe 35, passes through the injection unit 33, and then the mixing pipe 34. can be mixed with the flow of flowing seawater.

The process of FIG. 6 and the process of FIG. 7 may be selectively performed in consideration of the amount or type of microorganisms contained in seawater or the required amount of ballast water.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can realize that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

1: Exhaust and drainage pollutant reduction device
10: exhaust gas pipe 11: spray unit
20: washing water supply pipe 21: fresh water supply pipe
30: seawater supply pipe 31: control valve
32: sensor unit 33: injection unit
34: mixing pipe 35: bypass pipe
36: pump 37: seawater discharge pipe
38: confluence pipe 40: scrubber
41: washing water discharge pipe 50: purification unit
60: ballast water tank 70: filter unit
80: sludge tank 90: recirculation tank
91: circulation pipe

Claims (11)

an exhaust gas pipe for supplying exhaust gas of the combustion engine;
a washing water supply pipe for supplying washing water;
a scrubber spraying the washing water supplied through the washing water supply pipe to the exhaust gas flowing through the exhaust gas pipe;
connected to the exhaust gas pipe to supply an oxidizing agent for oxidizing nitrogen oxides, connected to at least one of the scrubber and the ballast water tank to supply a neutralizing agent for neutralizing the acidified washing water, and connected to the ballast water tank to supply seawater a purification unit supplying a sterilizing agent that kills the contained microorganisms; and
Including a washing water discharge pipe for discharging the washing water inside the scrubber,
The oxidizing agent, the neutralizing agent, and the sterilizing agent are sodium hypochlorite (NaOCl). The exhaust and drainage pollutant reduction device according to claim 1, wherein the purification unit atomizes and injects a liquid oxidizing agent into the exhaust gas pipe. The exhaust and waste pollutant reduction device according to claim 2, wherein the purification unit oxidizes nitrogen monoxide contained in the exhaust gas passing through the exhaust gas pipe to nitrogen dioxide. The apparatus of claim 1, further comprising a circulation pipe connecting the washing water discharge pipe and the washing water supply pipe. The exhaust and drainage pollutant reduction device according to claim 1, further comprising a filter unit connected to the washing water discharge pipe to separate solid particles contained in the washing water that has passed through the scrubber. The apparatus of claim 1, wherein the washing water supply pipe is branched from a seawater supply pipe that receives seawater from the outside and supplies the ballast water to the ballast water tank. The exhaust and drainage pollutant reduction apparatus according to claim 6, further comprising a control valve connecting the seawater supply pipe and the washing water supply pipe and controlling the amount or ratio of the seawater branched into the washing water supply pipe. The apparatus of claim 6, further comprising a fresh water supply pipe connected to the washing water supply pipe to supply fresh water. The method according to claim 6, wherein the washing water discharge pipe is connected to the seawater supply pipe, and the washing water passing through the scrubber is supplied to the ballast water tank through the seawater supply pipe, or mixed with seawater supplied through the seawater supply pipe and mixed with the outside again. A device for reducing exhaust and drainage pollutants discharged to the The exhaust and drainage pollutant reduction device according to claim 6, wherein the seawater supply pipe is branched into a ballast water supply pipe for supplying the ballast water to the ballast water tank and a seawater discharge pipe for discharging seawater to the outside. 11. The apparatus of claim 10, wherein the purification unit supplies the sterilizing agent to the seawater supply pipe and injects the neutralizing agent or the sterilizing agent into the seawater discharge pipe.

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