KR20210034950A - Water treatment system of vessel - Google Patents

Abstract

According to one embodiment of the present invention, provided is a water treatment system for a vessel. According to one embodiment of the present invention, the water treatment system for a vessel includes: a scrubber causing contact between liquid and gas by spraying cleaning water to exhaust gas supplied from a combustion engine mounted in a vessel; a cleaning water discharge pipe discharging the cleaning water in the scrubber; a cleaning water circulation tank connected onto the cleaning water discharge pipe to temporarily store the cleaning water discharged from the scrubber; a first filtration unit connected onto the cleaning water discharge pipe at the rear end of the cleaning water circulation tank to separate first solid particles included in the cleaning water; a cleaning water circulation pipe circulating the cleaning water, from which the first solid particles have been removed through the first filtration unit, to the scrubber; a heat exchanger installed on the cleaning water circulation pipe; and a ballast water supply pipe having one end connected to a seawater inlet and having the other end connected to a ballast water tank sequentially via the heat exchanger and the first filtration unit, thereby supplying seawater introduced through the seawater inlet to the ballast water tank, wherein the cleaning water circulation pipe and the ballast supply pipe can be selectively opened. Therefore, the present invention is capable of improving the use of space in a vessel.

Description

Water treatment system of vessel

The present invention relates to a water treatment system of a ship, and more particularly, to a water treatment system of a ship capable of treating both washing water discharged from a scrubber and seawater supplied to a ballast tank.

In general, various engines installed on ships generate power by burning fuel, and exhaust gases generated in the process of combustion of fuel are harmful substances such as nitrogen oxides (NOx), sulfur oxides (SOx), and fine dust (PM). Contains. As air pollution increases, regulations on various harmful substances contained in exhaust gases are becoming strict. In particular, sulfur oxides in exhaust gases are subject to emission regulations from the International Maritime Organization (IMO), the United Nations oxidation agency. It is one of the representative air pollutants that are present. In fact, from 2020, in addition to the Emission Control Area (ECA), the sulfur content of the fuel will be strengthened to 0.5% in the global area. Accordingly, various apparatuses and methods for treating exhaust gas from ships have been introduced. In the case of sulfur oxides, it is common to remove them using a wet scrubber, and the washing water discharged after gas-liquid contact with exhaust gas in the scrubber is discharged to the sea through a separate water treatment process or circulated to the scrubber.

Meanwhile, among environmental regulations on water pollution, the regulation on ballast water is also being strengthened. Ballast water is regulated to kill organisms or microorganisms of a certain size or larger contained in seawater, and various treatment methods are used for filtering and sterilizing microorganisms.

However, since conventional ships have a system for treating washing water discharged from a scrubber and a system for treating ballast water separately, not only increases the cost for installation and maintenance of each system, but also provides a wide range of systems for deployment. Installation space is required, and there is a problem of lowering the space utilization in the ship.

Accordingly, there is a need for a water treatment system having a structure capable of treating both the washing water discharged from the scrubber and the ballast water supplied to the ballast tank.

Republic of Korea Patent Publication No. 10-2019-0004059 (2019. 01. 11.)

The technical problem to be achieved by the present invention is, in detail, to provide a water treatment system for a ship capable of treating both washing water discharged from a scrubber and seawater supplied to a ballast tank.

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

A water treatment system of a ship according to an embodiment of the present invention for achieving the above technical problem includes a scrubber for injecting washing water into exhaust gas supplied from a combustion engine mounted on the ship to contact gas-liquid, and the washing water inside the scrubber. A washing water discharge pipe for discharging the washing water, a washing water circulation tank connected to the washing water discharge pipe to temporarily store the washing water discharged from the scrubber, and the washing water discharge pipe at the rear end of the washing water circulation tank. A first filtration unit for separating first solid particles contained in the washing water; a washing water circulation pipe for circulating the washing water from which the first solid particles are separated from the first filtration unit to the scrubber; and the washing water circulation pipe A heat exchanger installed on the top, and one end is connected to the seawater inlet, the other end is connected to the ballast water tank while passing through the heat exchanger and the first filtration unit in sequence, and the seawater introduced from the seawater inlet is supplied to the ballast water tank. And a ballast water supply pipe, wherein the washing water circulation pipe and the ballast water supply pipe are selectively opened.

The washing water circulation pipe includes a first washing water circulation pipe connecting between the first filtration unit and the washing water circulation tank, and a second washing water circulation pipe connecting between the washing water circulation tank and the scrubber. The heat exchanger may be installed in the second washing water circulation pipe.

The water treatment system of the vessel further includes a second filtration unit connected to the washing water discharge pipe at the rear end of the first filtration unit to separate second solid particles smaller than the first solid particles contained in the washing water. I can.

The washing water circulation pipe includes a first washing water circulation pipe connecting between the second filtration unit and the washing water circulation tank, and a second washing water circulation pipe connecting between the washing water circulation tank and the scrubber. The heat exchanger may be installed in the second washing water circulation pipe.

The water treatment system of the ship is connected to at least one of the washing water discharge pipe in front of the first filtration unit or the washing water discharge pipe between the first filtration unit and the second filtration unit, and the first It may further include a neutralizing agent injection unit for injecting the neutralizing agent to generate the solid particles or the second solid particles.

The water treatment system of the ship further comprises a disinfectant injection unit connected to the ballast water supply pipe between the first filtration unit and the ballast water tank, and injecting a disinfectant to sterilize organisms or microorganisms contained in the seawater. I can.

According to the present invention, since the conventional washing water treatment system and the ballast water treatment system are combined into one and share the heat exchanger and the first filtration unit, the cost for installation and maintenance of the system can be reduced, and space utilization in the ship can be increased. Can be.

1 is a block diagram schematically showing a water treatment system of a ship according to an embodiment of the present invention.
2 and 3 are operation diagrams for explaining the operation of the water treatment system of the ship of FIG.
4 is a block diagram schematically showing a water treatment system of a ship according to another embodiment of the present invention.
5 and 6 are operational diagrams for explaining the operation of the water treatment system of the ship of FIG. 4.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same elements throughout the specification.

Hereinafter, a water treatment system for a ship according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

In the water treatment system of a ship according to an embodiment of the present invention, since the conventional washing water treatment system and the ballast water treatment system are combined into one and share the heat exchanger and the first filtration unit, the cost for installation and maintenance of the system can be reduced. In addition, there is a characteristic that can increase the space utilization in the ship.

Hereinafter, a water treatment system 1 of a ship will be described in detail with reference to FIG. 1.

1 is a block diagram schematically showing a water treatment system of a ship according to an embodiment of the present invention.

The water treatment system 1 of a ship according to the present invention includes a scrubber 10, a washing water discharge pipe 20, a washing water circulation tank 30, a first filtration unit 40, and a washing water circulation pipe 50. And, a heat exchanger 60, and a ballast water supply pipe 70.

The scrubber 10 injects washing water into an exhaust gas supplied from a combustion engine (not shown) mounted on a ship to make gas-liquid contact, and the exhaust gas supply pipe 11 and the washing water supply pipe 12 are respectively connected.

The exhaust gas supply pipe 11 is a pipe that supplies exhaust gas generated from the combustion engine to the scrubber 10, and is directly connected to the exhaust port of the combustion engine to supply high-temperature exhaust gas or use most of the exhaust heat through various heat exchangers. And the remaining waste gas can be supplied. The combustion engine is a device that generates 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. The exhaust gas supply pipe 11 may be connected to an exhaust port of a plurality of combustion engines, respectively, and the plurality of combustion engines may be selectively operated. Since the combustion engine generally generates power by burning fossil fuels, it generates exhaust gas according to the combustion of fossil fuels. The generated exhaust gas contains a large amount of nitrogen oxides, sulfur oxides, organic substances, fine dust, etc., and is supplied to the scrubber 10 through an exhaust gas supply pipe 11 connected to one side of the combustion engine.

The washing water supply pipe 12 is a pipe that supplies at least one washing water of seawater or fresh water or a mixed water of seawater and fresh water to the scrubber 10, and has one end of a sea-chest (SC) and a fresh water storage tank ( Not shown) is connected to at least one of the other end is connected to the scrubber (10). That is, the washing water supply pipe 12 may selectively receive seawater and fresh water and supply them to the scrubber 10. The scrubber 10 is provided with a spray nozzle (not shown) for spraying the washing water in the form of fine particles therein, and the spray nozzles may be branched into a plurality and disposed along the flow direction of the exhaust gas. By arranging a plurality of injection nozzles inside the scrubber 10, the contact area, contact time, and number of contacts between the exhaust gas and the washing water are increased, resulting in contamination of nitrogen oxides, sulfur oxides, organic substances, and fine dust contained in the exhaust gas. The material can be removed effectively.

Exhaust gas from which pollutants such as nitrogen oxides, sulfur oxides, organic substances, and fine dust have been removed may be discharged to the outside through an exhaust pipe 13 provided above the scrubber 10. The exhaust gas discharged through the exhaust pipe 13 is in a state in which pollutants have been removed to a level suitable for exhaust standards, and thus can be discharged into the atmosphere as it is. The washing water in contact with the exhaust gas and gas-liquid inside the scrubber 10 is discharged through the washing water discharge pipe 20.

The washing water discharge pipe 20 is a pipe that discharges washing water inside the scrubber 10, and one end is connected to the lower portion of the scrubber 10 and the other end extends to the sea. That is, the washing water discharged through the washing water discharge pipe 20 is discharged to the sea. At least one pump (not shown) is installed in the washing water discharge pipe 20 to facilitate the movement of the washing water, and at least one valve is installed to control the movement of the washing water. In addition, the washing water circulation tank 30 and the first filtration unit 40 are sequentially connected on the washing water discharge pipe 20.

The washing water circulation tank 30 is disposed under the scrubber 10 to temporarily store the washing water discharged from the scrubber 10, and through the washing water discharge pipe 20, a certain amount of It can serve as a kind of buffer tank so that washing water can be supplied. In addition, the washing water circulation tank 30 may serve to temporarily store the washing water circulated in the first filtration unit 40 and circulate it to the scrubber 10.

The first filtration unit 40 is connected to the washing water discharge pipe 20 at the rear end of the washing water circulation tank 30 to separate the first solid particles contained in the washing water. In this case, a neutralizing agent injection unit 90 may be installed on the washing water discharge pipe 20 in front of the first filtration unit 40. The neutralizing agent injection unit 90 injects a neutralizing agent into the washing water, and the neutralizing agent injected into the washing water reacts with pollutants of exhaust gas dissolved in the washing water to generate first solid particles such as sulfate and nitrate. That is, the washing water temporarily stored in the washing water circulation tank 30 is in a state in which pollutants are dissolved, and the washing water supplied to the first filtration unit 40 contains the first solid particles by reacting the pollutants with the neutralizing agent. State. The first filtration unit 40 may be formed of a filter made of at least one porous mesh to separate the first solid particles contained in the washing water. For example, the first filtration unit 40 may be formed by overlapping a plurality of porous nets in a row along the flow direction of the washing water, and each of the plurality of porous nets may have different pore sizes. have. In other words, the size of the pores gradually decreases toward the rear end of the first filtration unit 40 from which the washing water is discharged from the front end of the first filtration unit 40 into which the washing water is introduced, so that the first solid particles can be effectively separated. have. However, it is not limited that the pores of each porous mesh are formed differently from each other, and for example, the plurality of porous meshes may have the same pore size. When all of the pores of the plurality of porous meshes are formed to have the same size, the first solid particles may be effectively separated by arranging the pores so as to deviate from each other. Some of the washing water from which the first solid particles are separated in the first filtration unit 40 is discharged to the sea through the washing water discharge pipe 20, and the remaining part is circulated to the scrubber 10 through the washing water circulation pipe 50 Can be.

The washing water circulation pipe 50 is a pipe for circulating the washing water from which the first solid particles are separated in the first filtration unit 40 to the scrubber 10, and at least one pump (not shown) is installed to You can move smoothly. The washing water circulation pipe 50 includes a first washing water circulation pipe 51 and a second washing water circulation pipe 52. The first washing water circulation pipe 51 is connected between the first filtration unit 40 and the washing water circulation tank 30, and the second washing water circulation pipe 52 is the washing water circulation tank 30 and the scrubber 10. Connect between. At least one valve is installed on the washing water circulation pipe 50 to control the movement of the washing water. A heat exchanger 60 may be installed on the washing water circulation pipe 50, in particular, the second washing water circulation pipe 52.

The heat exchanger 60 is for cooling the washing water circulated to the scrubber 10, and heat exchange with sea water or separate cooling water to lower the temperature of the washing water. The washing water circulating through the washing water circulation pipe 50 to the scrubber 10 is already in contact with the high-temperature exhaust gas and gas-liquid in the scrubber 10, so that the temperature is increased, so it is necessary to lower the temperature. The heat exchanger 60 lowers the temperature of the washing water moving through the second washing water circulation pipe 52 and supplies it to the scrubber 10.

On the other hand, the ship maintains balance by adjusting the amount of ballast water stored in the ballast tank 71, and the ballast water moves through the ballast water supply pipe 70. At least one valve is installed in the ballast water supply pipe 70 to control the movement of the ballast water, and the ballast water supply pipe 70 and the washing water circulation pipe 50 may be selectively opened. For example, when the ship is anchored and loaded or unloaded, the ballast water supply pipe 70 is opened because the amount of ballast water must be adjusted. During loading or unloading, the operation of the large-capacity main engine is stopped and only the small-capacity generator engine is operated, so that the amount of exhaust gas processed by the scrubber 10 is small, so that the amount of washing water supplied to the scrubber 10 is small. Therefore, since the amount of washing water discharged from the scrubber 10 is also small, the washing water circulation pipe 50 is closed. Conversely, when the ship is sailing, the main engine is operated and the amount of washing water discharged from the scrubber 10 is large, and thus the washing water circulation pipe 50 is opened. Since the amount of ballast water cannot be adjusted during sailing, the ballast water supply pipe 70 is closed.

More specifically, the ballast water supply pipe 70 has one end connected to the seawater inlet SC and the other end connected to the ballast water tank 71 through the heat exchanger 60 and the first filtration unit 40 in sequence, Seawater introduced from the seawater inlet (SC) is supplied to the ballast tank 71. When the ship is moored in the polar region, the cryogenic seawater flows through the seawater inlet (SC). When the cryogenic seawater moves through the ballast water supply pipe 70, it may cause damage to the device, so it is necessary to increase the temperature. When the ballast water supply pipe 70 passes through the heat exchanger 60, the temperature of seawater can be increased to a certain temperature or higher. The heat exchanger 60 may increase the temperature of seawater by exchanging heat with exhaust gas or the like. As described above, since the ballast water supply pipe 70 and the washing water circulation pipe 50 are selectively opened, when the heat exchanger 60 increases the temperature of seawater flowing through the ballast water supply pipe 70, cooling of the washing water This can be stopped. Conversely, when the heat exchanger 60 lowers the temperature of the washing water flowing through the washing water circulation pipe 50, heating of the ballast water may be stopped. By cooling the washing water with one heat exchanger 60 and heating the ballast water, installation and maintenance costs can be reduced compared to the case of installing a heat exchanger for cooling the washing water and a heat exchanger for heating the ballast water, respectively. Space utilization in ships can also be increased.

The seawater whose temperature is increased in the heat exchanger 60 is supplied to the first filtration unit 40. Since seawater introduced through the seawater inlet (SC) contains various organisms, microorganisms, foreign substances, etc., it is necessary to separate them. The first filtration unit 40 separates organisms, microorganisms, foreign substances, etc. contained in seawater moving through the ballast water supply pipe 70 and supplies them to the ballast water tank 71. As described above, since the first filtration unit 40 is formed of a filter made of a porous mesh, organisms, microorganisms, foreign substances, etc. of a certain size, for example 50 μm or more, contained in seawater can be separated. By filtering both the washing water and the ballast water with one first filtration unit 40, installation and maintenance costs can be reduced compared to the case of installing a filter unit for filtering the washing water and a filter unit for filtering the ballast water, respectively. It can also increase the space utilization in the ship. Seawater from which organisms, microorganisms, foreign substances, etc. are separated from the first filtration unit 40 is supplied to the ballast tank 71 after the disinfectant is injected.

The disinfectant for sterilizing organisms or microorganisms contained in seawater is injected from the disinfectant injection unit 100, and the disinfectant injection unit 100 is a ballast water supply pipe 70 between the first filtration unit 40 and the ballast tank 71. ) Is connected to the phase. By injecting the disinfectant into the seawater by the disinfectant injection unit 100, it is possible to satisfy the regulation required to kill organisms or microorganisms of a certain size or more contained in seawater. However, it is not limited to sterilization by injecting a sterilizing agent into seawater, and may be modified into various structures capable of sterilizing organisms or microorganisms. For example, at least one of a strong acidification device, an electrolysis device, an ozone generator, an ultraviolet device, and a plasma device is installed on the ballast water supply pipe 70 between the first filtration unit 40 and the ballast tank 71 It can also be used to sterilize organisms or microorganisms.

Hereinafter, the operation of the water treatment system 1 of the ship will be described in detail with reference to FIGS. 2 and 3.

2 and 3 are operation diagrams for explaining the operation of the water treatment system of the ship of FIG.

First, referring to FIG. 2, when the ship is sailing, the washing water circulation pipe 50 is opened and the ballast water supply pipe 70 is closed.

When the ship is sailing, the main engine with a large capacity is operated and a large amount of exhaust gas is produced. Exhaust gas generated from the main engine is supplied to the scrubber 10 through the exhaust gas supply pipe 11, and at the same time, the washing water is also supplied to the scrubber 10 through the washing water supply pipe 12. The exhaust gas supplied to the scrubber 10 and the washing water are in gas-liquid contact, so that pollutants such as nitrogen oxides, sulfur oxides, organic substances, and fine dust contained in the exhaust gas may be removed. The exhaust gas from which the pollutants are removed is discharged to the outside through the exhaust pipe 13, and the washing water in which the pollutants are dissolved is discharged through the washing water discharge pipe 20.

The washing water discharged through the washing water discharge pipe 20 is supplied to the first filtration unit 40 via the washing water circulation tank 30. At this time, since the neutralizing agent injection unit 90 injects the neutralizing agent into the washing water supplied to the first filtration unit 40, the first solid particles may be generated by reacting with the pollutants dissolved in the washing water and the neutralizing agent. Washing water including the first solid particles is supplied to the first filtration unit 40 to remove the first solid particles. As shown in FIG. 2, in the case of a closed loop method in which the washing water circulates, the washing water from which the first solid particles are removed comprises the first washing water circulation pipe 51 and the second washing water circulation pipe 52. It is circulated to the scrubber 10 through. Since the heat exchanger 60 is installed on the second washing water circulation pipe 52 connecting between the washing water circulation tank 30 and the scrubber 10, the washing water is cooled to a certain temperature and then circulated to the scrubber 10. I can.

On the other hand, in the case of an open loop method in which the washing water is discharged to the sea, the washing water circulation pipe 50 is closed and the washing water discharge pipe 20 at the rear end of the first filtration unit 40 is opened.

Conversely, referring to FIG. 3, when the ship is at anchor, the ballast water supply pipe 70 is opened and the washing water circulation pipe 50 is closed.

When the ship is anchored and loaded or unloaded, the balance must be maintained by adjusting the amount of ballast water. Seawater used as ballast water is introduced through the seawater inlet (SC) and is supplied to the ballast tank 71 through the ballast water supply pipe 70. Since the ballast water supply pipe 70 passes through the heat exchanger 60 and the first filtration unit 40 in sequence, the seawater is heated to a certain temperature or higher, and organisms, microorganisms, foreign substances, etc. are separated, and then transferred to the ballast water tank 71. Can be supplied. At this time, since the disinfectant injection unit 100 injects the disinfectant into the seawater supplied with the ballast water tank 71, it may be supplied to the ballast water tank 71 after the organisms or microorganisms contained in the seawater are killed.

On the other hand, when the ship is anchored, the operation of the main engine is stopped and the generator engine with low capacity is operated. When the generator engine is running, a small amount of exhaust gas is produced. The exhaust gas generated by the generator engine is supplied to the scrubber 10 through the exhaust gas supply pipe 11, and at the same time, the washing water is also supplied to the scrubber 10 through the washing water supply pipe 12. The exhaust gas supplied to the scrubber 10 and the washing water are in gas-liquid contact, so that pollutants such as nitrogen oxides, sulfur oxides, organic substances, and fine dust contained in the exhaust gas may be removed. The exhaust gas from which the pollutants are removed is discharged to the outside through the exhaust pipe 13, and the washing water in which the pollutants are dissolved is discharged through the washing water discharge pipe 20 and temporarily stored in the washing water circulation tank 30.

Hereinafter, a water treatment system of a ship according to another embodiment of the present invention will be described in detail with reference to FIGS. 4 to 6.

4 is a block diagram schematically showing a water treatment system of a ship according to another embodiment of the present invention.

In the water treatment system 1 of a ship according to another embodiment of the present invention, the second filtration unit 80 is connected to the washing water discharge pipe 20 at the rear end of the first filtration unit 40, and the first washing water circulation pipe ( 51) is connected between the second filtration unit 80 and the washing water circulation tank 30. In the water treatment system 1 of a ship according to another embodiment of the present invention, the second filtration unit 80 is connected to the washing water discharge pipe 20 at the rear end of the first filtration unit 40, and the first washing water circulation pipe ( 51) is substantially the same as the above-described embodiment, except that the second filtration unit 80 and the washing water circulation tank 30 are connected. Therefore, this will be mainly described, but the description of the remaining components will be replaced with the above unless otherwise noted.

The second filtration unit 80 is connected to the washing water discharge pipe 20 at the rear end of the first filtration unit 40, and the second filtration unit 80 is a second solid particle smaller than the first solid particles contained in the washing water. Separate At this time, the neutralizing agent injection unit 90 is the washing water discharge pipe 20 in front of the first filtration unit 40, or the washing water discharge pipe 20 between the first filtration unit 40 and the second filtration unit 80. A neutralizing agent for generating the first solid particles or the second solid particles may be injected into at least one of them. For example, the neutralizing agent injection unit 90 is connected to the washing water discharge pipe 20 between the first filtration unit 40 and the second filtration unit 80, so that foreign substances, etc. are removed from the first filtration unit 40. A neutralizing agent can be injected into the washed water. When the neutralizing agent is injected into the washing water from which foreign substances or the like have been removed by the first filtration unit 40, the amount of the neutralizing agent can be reduced, thereby reducing the cost. Like the first filtration unit 40, the second filtration unit 80 may be formed of a filter made of at least one porous mesh. In this case, the size of the pores of the porous mesh constituting the second filtration unit 80 may be smaller than the size of the pores of the porous mesh constituting the first filtration unit 40. Since the second filtration unit 80 is disposed at the rear end of the first filtration unit 40, even the second solid particles smaller than the first solid particles can be separated, so that the washing water can be treated more effectively. However, the second filtration unit 80 is not limited to being formed of a filter made of a porous mesh. For example, the second filtration unit 80 may be formed of a centrifugal separator, a gravity separator, or the like.

On the other hand, the washing water circulation pipe 50 circulates the washing water from which foreign matters or the first solid particles and the second solid particles are separated from the first filtration unit 40 and the second filtration unit 80, respectively, to the scrubber 10. , And a first washing water circulation pipe 51 and a second washing water circulation pipe 52. The first washing water circulation pipe 51 is connected between the second filtration unit 80 and the washing water circulation tank 30, and the second washing water circulation pipe 52 is the washing water circulation tank 30 and the scrubber 10. Connect between. A heat exchanger 60 may be installed on the second washing water circulation pipe 52.

Hereinafter, the operation of the water treatment system 1 of the ship will be described in detail with reference to FIGS. 5 and 6.

5 and 6 are operational diagrams for explaining the operation of the water treatment system of the ship of FIG. 4.

First, referring to FIG. 5, when the ship is sailing, the washing water circulation pipe 50 is opened and the ballast water supply pipe 70 is closed.

When the ship is sailing, the main engine is activated and a large amount of exhaust gas is produced. Exhaust gas generated from the main engine is supplied to the scrubber 10 through the exhaust gas supply pipe 11, and at the same time, the washing water is also supplied to the scrubber 10 through the washing water supply pipe 12. The exhaust gas supplied to the scrubber 10 and the washing water are in gas-liquid contact, so that pollutants such as nitrogen oxides, sulfur oxides, organic substances, and fine dust contained in the exhaust gas may be removed. The exhaust gas from which the pollutants are removed is discharged to the outside through the exhaust pipe 13, and the washing water in which the pollutants are dissolved is discharged through the washing water discharge pipe 20.

The washing water discharged through the washing water discharge pipe 20 is supplied to the first filtration unit 40 via the washing water circulation tank 30 to remove foreign substances and the like, and then the second filtration unit 80 is supplied. At this time, since the neutralizing agent injection unit 90 injects the neutralizing agent into the washing water supplied to the second filtering unit 80, the second solid particles may be generated by reacting with the pollutants dissolved in the washing water and the neutralizing agent. Washing water including the second solid particles is supplied to the second filtration unit 80 to remove the second solid particles. As shown in FIG. 5, in the case of a closed loop method in which the washing water circulates, the washing water from which the second solid particles are removed comprises the first washing water circulation pipe 51 and the second washing water circulation pipe 52. It is circulated to the scrubber 10 through. Since the heat exchanger 60 is installed on the second washing water circulation pipe 52 connecting between the washing water circulation tank 30 and the scrubber 10, the washing water is cooled to a certain temperature and then circulated to the scrubber 10. I can.

On the other hand, in the case of an open loop method in which the washing water is discharged to the sea, the washing water circulation pipe 50 is closed and the washing water discharge pipe 20 at the rear end of the first filtration unit 40 is opened.

Conversely, referring to FIG. 6, when the ship is at anchor, the ballast water supply pipe 70 is opened and the washing water circulation pipe 50 is closed.

When the ship is anchored and loaded or unloaded, seawater used as ballast water is introduced through the seawater inlet SC and supplied to the ballast tank 71 through the ballast water supply pipe 70. Since the ballast water supply pipe 70 passes through the heat exchanger 60 and the first filtration unit 40 in sequence, the seawater is heated to a certain temperature or higher, and organisms, microorganisms, foreign substances, etc. are separated, and then transferred to the ballast water tank 71. Can be supplied. At this time, since the disinfectant injection unit 100 injects the disinfectant into the seawater supplied with the ballast water tank 71, it may be supplied to the ballast water tank 71 after the organisms or microorganisms contained in the seawater are killed.

On the other hand, when the ship is anchored, the operation of the main engine is stopped and the generator engine with low capacity is operated. When the generator engine is running, a small amount of exhaust gas is produced. The exhaust gas generated by the generator engine is supplied to the scrubber 10 through the exhaust gas supply pipe 11, and at the same time, the washing water is also supplied to the scrubber 10 through the washing water supply pipe 12. The exhaust gas supplied to the scrubber 10 and the washing water are in gas-liquid contact, so that pollutants such as nitrogen oxides, sulfur oxides, organic substances, and fine dust contained in the exhaust gas may be removed. The exhaust gas from which the pollutants are removed is discharged to the outside through the exhaust pipe 13, and the washing water in which the pollutants are dissolved is discharged through the washing water discharge pipe 20 and temporarily stored in the washing water circulation tank 30.

Embodiments of the present invention have been described above with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features. You will be able to understand. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects.

1: water treatment system on the ship
10: scrubber 11: exhaust gas supply pipe
12: washing water supply pipe 13: exhaust pipe
20: washing water discharge pipe 30: washing water circulation tank
40: first filtration unit 50: washing water circulation pipe
51: first washing water circulation pipe 52: second washing water circulation pipe
60: heat exchanger 70: ballast water supply pipe
71: ballast tank 80: second filtration unit
90: neutralizer injection unit 100: disinfectant injection unit
SC: Seawater inlet

Claims (6)

A scrubber for injecting washing water into exhaust gas supplied from a combustion engine mounted on a ship to contact gas-liquid;
A washing water discharge pipe for discharging the washing water inside the scrubber;
A washing water circulation tank connected to the washing water discharge pipe to temporarily store the washing water discharged from the scrubber;
A first filtering unit connected to the washing water discharge pipe at a rear end of the washing water circulation tank to separate first solid particles contained in the washing water;
A washing water circulation pipe for circulating the washing water from which the first solid particles are separated from the first filtration unit to the scrubber;
A heat exchanger installed on the washing water circulation pipe; And
A ballast water supply pipe having one end connected to the seawater inlet and the other end sequentially passing through the heat exchanger and the first filtration unit and connected to a ballast tank to supply seawater introduced from the seawater inlet to the ballast water tank,
The water treatment system of the ship in which the washing water circulation pipe and the ballast water supply pipe are selectively opened. The method of claim 1, wherein the washing water circulation pipe,
A first washing water circulation pipe connecting between the first filtration unit and the washing water circulation tank, and a second washing water circulation pipe connecting between the washing water circulation tank and the scrubber,
The heat exchanger is a water treatment system of a ship installed in the second washing water circulation pipe. The method of claim 1,
A water treatment system of a ship further comprising a second filtration unit connected to the washing water discharge pipe at the rear end of the first filtration unit to separate second solid particles smaller than the first solid particles contained in the washing water. The method of claim 3, wherein the washing water circulation pipe,
A first washing water circulation pipe connecting between the second filtration unit and the washing water circulation tank, and a second washing water circulation pipe connecting between the washing water circulation tank and the scrubber,
The heat exchanger is a water treatment system of a ship installed in the second washing water circulation pipe. The method of claim 2 and 4,
It is connected to at least one of the washing water discharge pipe in front of the first filtration unit or the washing water discharge pipe between the first filtration unit and the second filtration unit, and the first solid phase particles or the second solid phase in the washing water A water treatment system of a ship further comprising a neutralizing agent injection unit for injecting a neutralizing agent to generate particles. The method of claim 1,
A water treatment system of a ship further comprising a disinfectant injection unit connected to the ballast water supply pipe between the first filtration unit and the ballast water tank and injecting a disinfectant for sterilizing organisms or microorganisms contained in the seawater.

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