KR102290477B1 - Carbon dioxide Reduction System for Ship - Google Patents

Abstract

The present invention relates to a carbon dioxide (CO2) reduction system for a ship, which comprises: a CO2 scrubber which receives and processes exhaust gas discharged from a combustion engine placed in the ship; and an absorbent supply unit which supplies an absorbent, which absorbs CO2 included in the exhaust gas, to the CO2 scrubber. The absorbent supply unit includes: an absorbent circulation tank which circulates and supplies the absorbent into the CO2 scrubber; an absorbent storage tank which supplements and stores a new absorbent into the absorbent circulation tank for keeping the concentration of the absorbent circulation tank uniform; and a waste absorbent storage tank which, when the absorbing capacity of the absorbent circulating from the absorbent circulation tank to the CO2 scrubber is lowered to under a certain level and the absorbent becomes a waste absorbent, receives and stores the waste absorbent from the absorbent circulation tank. In accordance with the present invention, the CO2 reduction system for the ship is able to efficiently reduce and discharge the CO2 substances, which have been difficult to remove in the conventional exhaust gas processing system, effectively satisfy the air pollution regulations, which are more and more strengthened in the whole world, and greatly contribute to reducing the greenhouse gases, which are the main culprit for the global warming, in an ultimate sense.

Description

Carbon dioxide Reduction System for Ship

The present invention relates to a carbon dioxide reduction system for a ship, and more particularly, to a carbon dioxide reduction system for a ship capable of reducing and discharging air pollutants, particularly carbon dioxide, contained in exhaust gas emitted from a combustion engine of a ship.

Combustion engines, such as engines and boilers provided in ships, generate exhaust gases due to combustion. Exhaust gas generated from combustion engines contains a large amount of nitrogen oxides (NO _X ), sulfur oxides (SO _X ), carbon dioxide (CO ₂ ) and air pollutants such as dust.

In particular, nitrogen oxides and sulfur oxides contained in exhaust gas emitted from ships are representative air pollutants subject to emission control from the International Maritime Organization (IMO), an organization under the United Nations (UN).

As a method for reducing sulfur oxides in exhaust gas, a method of using a fuel that does not contain a sulfur component as a fuel of a combustion engine or removing the sulfur component in the fuel so that sulfur oxides are not generated during combustion, and a method of removing the exhaust gas with a scrubber There is a post-treatment method in which a cleaning liquid (eg, seawater, etc.) is sprayed on the exhaust gas in the process of supplying it to a scrubber and passing it through to collect sulfur oxides in the exhaust gas.

In addition, as a method for reducing nitrogen oxides in exhaust gas, a selective catalytic reduction (SCR: Selective Catalytic Reduction) method and an exhaust gas recirculation (EGR: Exhaust Gas Recirculation) system are known. Selective catalytic reduction converts nitrogen oxides into nitrogen and water using a catalyst injected with ammonia or urea, which is a reducing agent, and removes nitrogen oxides. It is to reduce the amount of nitrogen oxide generated by lowering the combustion temperature of the engine by supplying it to the

Meanwhile, as the seriousness of the global warming phenomenon has recently been recognized, countries around the world are working hard to prepare countermeasures for greenhouse gases, and one of the biggest factors of global warming is carbon dioxide.

In particular, as the number of ships, which are one of the means of transportation between countries, increases exponentially as the global trade industry becomes active, many A large amount of carbon dioxide is released into the atmosphere as it is, which is a cause of accelerating global warming.

Therefore, the need to reduce carbon dioxide in addition to sulfur oxides and nitrogen oxides among air pollutants included in the exhaust gas emitted from ships is growing. In addition, regulations on exhaust gases emitted from ships are increasingly being strengthened.

However, in contrast to the well-known devices and methods for reducing sulfur oxides and nitrogen oxides in exhaust gas, the development of devices for reducing carbon dioxide, a greenhouse gas that is the main culprit of global warming, is still insufficiently developed.

Although it may be possible to partially remove carbon dioxide by spraying seawater to the exhaust gas using the scrubber method described above, seawater preferentially acts on the capture of sulfur oxides in the exhaust gas, so that only a small amount of carbon dioxide can be removed, so gradually strengthen It cannot be a countermeasure to the carbon dioxide regulations that are becoming increasingly common.

Although the energy structure has recently changed toward eco-friendly such as new and renewable energy, the generation of large amounts of carbon dioxide is unavoidable as the use of fossil fuels such as coal, oil, and natural gas, which are energy sources that have supported human civilization since the industrial revolution, is inevitable. Reality. Therefore, there is an urgent need to develop a system that can efficiently reduce carbon dioxide.

An object of the present invention is to effectively satisfy air pollution regulations that are becoming increasingly stringent around the world, and air pollutants contained in exhaust gas discharged from combustion engines of ships, especially air pollutants that are difficult to remove in the existing exhaust gas treatment system. An object of the present invention is to provide a carbon dioxide reduction system for ships that can efficiently reduce and discharge carbon dioxide components.

According to an aspect of the present invention for achieving the above object, a CO ₂ scrubber for receiving and treating exhaust gas discharged from a combustion engine provided on a ship; and an absorbent supply unit supplying an absorbent for absorbing carbon dioxide contained in the exhaust gas to the CO ₂ scrubber, wherein the absorbent supply unit includes: an absorbent circulation tank for circulating and supplying the absorbent into the _{CO 2 scrubber;} an absorbent storage tank for replenishing and storing a new absorbent into the absorbent circulation tank to maintain a constant concentration of the absorbent circulation tank; and a waste absorbent storage tank for receiving and storing the waste absorbent from the absorbent circulation tank when the absorption capacity of the absorbent circulating from the absorbent circulation tank to the CO _{2 scrubber falls below a certain level to become a waste absorbent,} A ship's carbon dioxide abatement system may be provided.

The absorbent circulation tank may serve as a buffer tank, such that the absorbent been supplied from the absorber reservoir the CO ₂ stored temporarily before the scrubber inside fed to, and that the absorbent discharged from the CO ₂ scrubber circulation .

The absorbent is a liquid absorbent, and may be supplied in a manner that is sprayed into _{the CO 2 scrubber through a spray nozzle.}

The absorbent may include an amine absorbent or formic acid.

The carbon dioxide reduction system of a ship according to an aspect of the present invention is provided on the exhaust gas outlet through which the exhaust gas from which carbon dioxide has been reduced in _{the CO 2 scrubber is discharged, and the carbon dioxide concentration of the exhaust gas discharged through the exhaust gas outlet} a concentration analyzer to detect; and a control unit controlling an operation of the absorbent supply unit according to the concentration of carbon dioxide measured by the concentration analyzer.

According to the present invention, it is possible to efficiently reduce and discharge the carbon dioxide component, which has been difficult to remove in the existing exhaust gas treatment system, so that it is possible to effectively satisfy the air pollution regulations that are increasingly tightened around the world, and ultimately global warming. There is an effect that can greatly contribute to the reduction of greenhouse gases, which are the main culprits of

1 is a view showing a carbon dioxide reduction system for a ship according to the present invention.
2 is a view showing a carbon dioxide reduction system for a ship according to an embodiment of the present invention.
3 is a view showing a carbon dioxide reduction system for a ship according to another embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Matters expressed in the drawings attached to this specification may be somewhat different from the forms actually implemented in the drawings schematically for easy explanation of the embodiments of the present invention, and the size of each component shown in the drawings is for the purpose of explanation. It may be exaggerated and does not imply the actual applied size.

In addition, the terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. For example, 'including' a certain component in the specification means that other components may be further included, rather than excluding other components, unless otherwise stated.

In addition, it should be understood that, that a component is 'connected' to another component includes a direct connection as well as an indirect connection, and another component may exist between the two components. The singular expression may be construed to include the plural expression unless the context clearly dictates otherwise.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. The embodiments described below are provided so that those skilled in the art can easily understand the technical spirit of the present invention, and the present invention is not limited thereto.

1 is a view showing a carbon dioxide reduction system for a ship according to the present invention. 1, the carbon dioxide reduction system of a ship according to the present invention, the exhaust gas discharged to a combustion engine such as an engine provided in the ship is supplied to reduce the carbon dioxide component is made CO ₂ scrubber 100, and the exhaust gas For the purpose of absorbing and removing carbon dioxide in the CO ₂ , it may include an absorbent supply unit 200 for supplying an absorbent to the inside of the scrubber 100 .

An exhaust gas inlet 110 through which exhaust gas discharged from a combustion engine is introduced and an exhaust gas outlet 120 through which exhaust gas having reduced carbon dioxide is discharged may be provided in the lower and upper portions of the CO _{2 scrubber 100, respectively.} . Therefore, _{the exhaust gas supplied into the CO 2} scrubber 100 flows from the bottom to the top is formed.

_{A concentration analyzer 121 for measuring the concentration of carbon dioxide in the exhaust gas treated by the CO 2} scrubber 100 may be installed at the exhaust gas outlet 120, and according to the value measured by the concentration analyzer 121, which will be described later The operation of the absorbent supply unit 200 may be controlled. The concentration analyzer 121 may be configured to measure the concentration of carbon dioxide as well as other required concentrations of other gas components.

The absorbent supply unit 200, _{the absorbent circulation tank 210 for circulating and supplying the carbon dioxide absorbent into the CO 2} scrubber 100, and the absorbent circulation tank 210 to maintain a constant concentration of the absorbent supplied to the absorbent supplement and an absorbent storage tank 220 for storing, and a waste absorbent storage tank 230 for receiving and storing the waste absorbent in which carbon dioxide has been sufficiently absorbed from the absorbent circulation tank 210 .

Absorbent circulating tank 210, to temporarily store before the sorbent that received from the absorber reservoir tank 220 is supplied into the CO ₂ scrubber 100, and the absorbent discharged from the CO ₂ scrubber 100 may be circulated It can serve as a kind of buffer tank.

The absorbent temporarily staying in the absorbent circulation tank 210 may be supplied into _{the CO 2 scrubber 100 through the absorbent supply line L1.} Although only one absorbent circulation tank 210 is shown in the drawing, it is also possible that the absorbent circulation tank 210 is configured as a double or multiple tank.

As the absorbent supplied to the CO ₂ scrubber 100 through the absorbent supply line L1, a material having a property of absorbing carbon dioxide contained in the exhaust gas by being in contact with the exhaust gas may be used. For example, the absorbent may be an amine absorbent such as MEA (Monoethanol Amine) or formic acid, also called formic acid, but the present invention is not limited thereto. Any well-known material can be used as long as it can absorb and remove carbon dioxide by chemical reaction.

_{The absorbent supplied into the CO 2} scrubber 100 through the absorbent supply line L1 may be supplied in a spraying manner through a spray nozzle. This is to increase the carbon dioxide absorption rate by increasing the contact area between the exhaust gas and the absorbent flowing in the _{CO 2 scrubber 100 .} Therefore, it is preferable that the absorbent is a liquid absorbent so that it can be easily sprayed in the form of fine droplets.

Drawing sorbent feed line (L1) is CO _2, but is shown connected to the side of the scrubber 100, the absorbent absorbing agent supply line (L1) a CO ₂ scrubber (100 so that the injection from the upper part of the CO ₂ scrubber 100 ) may be connected to the top of the In addition, it is of course possible that the absorbent spray nozzle is provided in both the upper portion and the side portion _{of the CO 2 scrubber 100 .}

_{The exhaust gas supplied into the CO 2} scrubber 100 through the exhaust gas inlet 110 is in gas-liquid contact with the absorbent sprayed through the injection nozzle, and in the contact process, carbon dioxide contained in the exhaust gas is absorbed by the absorbent and exhaust gas can be removed from

Exhaust gas from which carbon dioxide has been removed by the absorbent may be exhausted to the outside through the exhaust gas outlet 120 provided at the upper portion of the _{CO 2 scrubber 100, and the absorbent that has absorbed carbon dioxide in the exhaust gas is the CO 2} scrubber 100 ) may be discharged to the absorbent circulation tank 210 through the absorbent discharge line (L2) connected to the lower end.

That is, the carbon dioxide reduction system for a ship according to the present invention is an _{open loop method in which the absorbent supplied to the CO 2} scrubber 100 is supplied from the absorbent circulation tank 210 and circulated back to the absorbent circulation tank 210 . can be composed of

However, the present invention is not limited thereto, and configuring the system in a closed loop method in which the absorbent in which carbon dioxide has been absorbed from the _{CO 2 scrubber 100 is not circulated but directly discharged to the outside through a separate treatment is also} Of course it is possible.

The absorbent storage tank 220 supplements and stores the absorbent in order to maintain a constant concentration of the absorbent supplied to the absorbent circulation tank 210, and may hold a certain amount of the new absorbent. Here, the new absorbent may mean including a new absorbent as well as a renewable absorbent in which carbon dioxide absorption ability is recovered through a regeneration process.

As described above, when the carbon dioxide reduction system of a ship according to the present invention is configured in an open-loop manner, the ability to absorb carbon dioxide may decrease as the absorbent stored in the absorbent circulation tank 210 is repeatedly used. By supplying the new absorbent stored in the absorbent storage tank 220 to the absorbent circulation tank 210 side, the carbon dioxide absorption rate of the absorbent temporarily stored in the absorbent circulation tank 210 can be maintained above a certain level.

On the other hand, when the concentration of the absorbent in the absorbent circulation tank 210 falls to an unsuitable level for reduction of carbon dioxide despite replenishment by the absorbent storage tank 220, the absorbent stored in the absorbent storage tank 220 is no longer used. It is determined that this is an impossible 'waste absorbent', and it is discharged to the waste absorbent storage tank 230 along the waste absorbent discharge line L3.

The waste absorbent storage tank 230 receives and stores the waste absorbent in which carbon dioxide has been sufficiently absorbed from the absorbent circulation tank 210, and the waste absorbent stored in the waste absorbent storage tank 230 is then transferred to land when the vessel is anchored for treatment. Alternatively, it may be recycled through a regeneration process in which carbon dioxide is again separated (desorbed).

The carbon dioxide reduction system of a ship according to the present invention may further include a control unit 300 for controlling the operations of the _{CO 2 scrubber 100 and the adsorbent supply unit 200 .}

The control unit 300 may perform overall control of the system based on the _{CO 2} concentration value measured by the concentration analyzer 121 described above _{, and specifically, the CO 2} scrubber 100 of the absorbent supplied into the interior. Control of maintaining a constant concentration of the absorbent in the absorbent circulation tank 210 may be performed by adjusting the amount or by adjusting the amount of the new absorbent supplied to the absorbent circulation tank 210 .

In addition, the control unit 300 determines whether the waste absorbent state has been reached according to the concentration of the absorbent stored in the absorbent circulation tank 210 , and transfers the waste absorbent in the absorbent circulation tank 210 to the waste absorbent storage tank 230 . Emission control may also be performed. To this end, the absorbent circulation tank 210 may further include a detector (not shown) for detecting the concentration of the absorbent.

The control unit 300 may be linked with an Integrated Automation System (IAS) of the ship to automatically control the present system.

2 is a view showing a carbon dioxide reduction system for a ship according to an embodiment of the present invention. Referring to FIG. 2 , the carbon dioxide reduction system for a ship according to an embodiment of the present invention may be installed in series at the rear end of the _{SO X scrubber 10 for reducing sulfur oxides in the exhaust gas discharged from the combustion engine.} .

In general, fuel oil used in ships can be divided into High Sulfur Oil (HFO) and Low Sulfur Fuel Oil (LSFO) depending on the sulfur content. In order to satisfy sulfur oxide emission regulations, the use of a sulfur oxide reduction scrubber is essential.

An embodiment disclosed in FIG. 2 shows a carbon dioxide reduction system for a ship according to the present invention that can be preferably applied when using high sulfur oil as a fuel for a ship as described above.

According to an embodiment of the present invention, the exhaust gas discharged from the combustion engine of the ship is primarily introduced into the SO _X scrubber 10 to reduce sulfur oxides, and then is supplied to the _{CO 2 scrubber 100 to secondary} reduction of carbon dioxide is achieved.

More specifically, the exhaust gas discharged from the combustion engine is introduced through the exhaust gas inlet 11 provided at the lower portion _{of the SO X} scrubber 10, and then seawater in the process of flowing upward in the _{SO X scrubber 10.} The reduction of sulfur oxides is first made by gas-liquid contact with seawater supplied through the supply line SL1.

SO inside the _X scrubber 10. The exhaust gas sulfur oxides removed by contact with the sea water is fed to a CO ₂ scrubber 100 via the exhaust gas discharge port provided in the upper part of the SO _X scrubber 10, the sulfuric acid The seawater collected from the cargo is discharged through the seawater discharge line (SL2). Wherein an exhaust gas outlet of the SO _X scrubber 10 can soon become an exhaust gas inlet 110 of the SO _X scrubber (10).

The exhaust gas flowing into the _{CO 2} scrubber 100 is in a state in which sulfur oxides are reduced by gas-liquid contact with seawater inside the _{SO X} scrubber 10, and gas-liquid contact with the absorbent supplied into the _{CO 2 scrubber 100.} After the carbon dioxide is reduced by the , it may be finally exhausted to the outside through the exhaust gas outlet 120 .

As described above, the SO _X scrubber 10 and the CO ₂ scrubber 100 are arranged in series to configure a system to sequentially reduce sulfur oxides and carbon dioxide. According to an embodiment of the present invention, the SO _X scrubber 10 ) In addition to reducing sulfur oxides in exhaust gas by gas-liquid contact with seawater from the inside, a small amount of carbon dioxide can be reduced.

Since sulfur oxides in the exhaust gas are first removed when the basic absorbent is injected into the exhaust gas, it is more preferable to preemptively remove the sulfur oxides in the exhaust gas in order to improve the carbon dioxide reduction rate.

In addition, according to an embodiment of the present invention, particulate matter, such as fine dust, charcoal, soot, etc. contained in the exhaust gas by seawater in _{the SO X scrubber 10 responsible for the primary treatment of the exhaust gas can be filtered.} . Therefore, since _{the exhaust gas supplied to the CO 2} scrubber 100 does not contain particulate matter and contains only chemical components such as carbon dioxide, the absorbent (absorbent solution) circulating the absorbent circulation tank 210 from the _{CO 2 scrubber 100} It can be circulated in this clean state, and thus, it is possible to achieve the effect of increasing the service life of the absorbent circulating in the absorbent circulation tank 210 .

Although not shown in FIG. 2, it should be understood that a concentration analyzer 121 (refer to FIG. 1) may of course be provided at the exhaust gas outlet 120 of the _{CO 2 scrubber 100, in which case the concentration analyzer is of carbon dioxide and sulfur oxides.} It may be provided so that all measurements of the concentration are possible.

3 is a view showing a carbon dioxide reduction system for a ship according to another embodiment of the present invention. 3, the carbon dioxide reduction system of a ship according to another embodiment of the present invention, the SO _X scrubber 10 and the CO ₂ scrubber 100 can be configured to selectively receive the exhaust gas discharged from the combustion engine. have.

As described above, when high sulfur oil is used as a fuel for a ship, the use of a sulfur oxide reduction scrubber is essential to satisfy sulfur oxide emission regulations, but when using low sulfur oil, sulfur oxide reduction may not be necessary. have.

Another embodiment disclosed in FIG. 3 shows a carbon dioxide reduction system for a ship according to the present invention that can be preferably applied to a ship that selectively uses high sulfur oil and low sulfur oil.

According to another embodiment of the present invention, the exhaust gas discharged from the combustion engine of the ship is transported through the exhaust gas supply pipe (P), and then, the SO _X scrubber 10 and the CO ₂ scrubber 100. can be imported.

To this end, the exhaust gas supply pipe (P) branches into an exhaust gas inlet 11 for introducing exhaust gas into the _{SO X} scrubber 10 and an exhaust gas inlet 110 for introducing exhaust gas into the _{CO 2 scrubber 100.} A damper (Damper, D) for changing the direction of the exhaust gas fluid may be installed at the branch point where each pipe is branched.

First, looking at the operation of the ship's carbon dioxide reduction system according to another embodiment of the present invention when using high sulfur oil fuel, the damper D is installed so _{that the exhaust gas discharged from the combustion engine flows into the SO X scrubber 10 .} It can be converted, and the exhaust gas flowing into the SO _X scrubber 10 after the sulfur oxides reduction by the gas-liquid contact with water, and finally the first exhaust gas outlet provided at the upper part of the SO _X scrubber (10) ( 12) can be exhausted to the outside.

On the other hand, in the case of using a low dielectric sulfur oil fuels, and the exhaust gas discharged from the combustion engine may be a damper (D) conversion to be introduced into the CO ₂ scrubber 100, the exhaust gas flowing into the CO ₂ scrubber 100 After carbon dioxide is reduced by gas-liquid contact with the absorbent, it may be finally exhausted to the outside through the second exhaust gas outlet 120 provided on the upper portion of the _{CO 2 scrubber 100 .}

On the other hand, in the case of using high sulfur oil as a fuel for a combustion engine provided in a ship as described above, there may be a case where not only reduction of sulfur oxides but also reduction of carbon dioxide is required.

In this case, the bypass pipe directly connected to the exhaust gas inlet 110 of the _{CO 2} scrubber 100 from the exhaust gas inlet 11 of the _{SO X} scrubber 10 in the embodiment of the present invention shown in FIG. (not shown) further provided, or from the exhaust gas outlet 12 of the _{SO X} scrubber 10 in another embodiment of the present invention shown in FIG. 3 to the exhaust gas inlet 110 of the _{CO 2 scrubber 100} A bypass pipe (not shown) connected thereto is further provided, so that when high sulfur oil fuel is used, the exhaust gas discharged from the combustion engine _{sequentially passes through the SO X} scrubber 10 and the CO ₂ scrubber 100 , while sulfur oxides and reduction of carbon dioxide, and when using low-sulfur fuel, the exhaust gas discharged from the combustion engine _{is supplied only to the CO 2} scrubber 100 to configure the system so that only reduction of carbon dioxide is achieved.

Hereinafter, a method for operating a ship having a carbon dioxide reduction system for a ship according to the present invention will be described.

1) How to operate a ship using low-sulfur fuel

May be provided with a carbon dioxide reduction of the vessel according to the invention disclosed in only one vessel is also to use a low dielectric sulfur oil fuel, the exhaust gas discharged from a combustion engine in accordance with the low dielectric sulfur oil fuel is supplied to the CO ₂ scrubber 100, the carbon dioxide Exhaust gas treatment may be performed so that the exhaust gas is exhausted after the reduction of the . In this case, a separate sulfur oxide reduction scrubber does not need to be provided.

2) How to operate a ship that uses high sulfur oil fuel

Be provided with a vessel of carbon dioxide reduction system according to an embodiment of the present invention disclosed a unique sulfur oil fuel in the second vessel is also used an example, and specific sulfur oil exhaust gases discharged from a combustion engine according to the fuel used by the SO _X scrubber (10 ) and CO ₂ Exhaust gas treatment may be performed to reduce sulfur oxides and carbon dioxide while sequentially passing through the scrubber 100 .

3) How to operate a ship that selectively uses low-sulfur fuel and high-sulfur fuel

A ship selectively using low-sulfur oil fuel and high-sulfur oil fuel is a ship's carbon dioxide reduction system according to an embodiment of the present invention disclosed in FIG. 2 or a ship's carbon dioxide reduction system according to another embodiment of the present invention disclosed in FIG. can be provided

3-1)

First, the operating method of a ship equipped with a carbon dioxide reduction system for a ship according to an embodiment of the present invention disclosed in FIG. 2 will be described. processing should be performed.

When the ship uses low-sulfur fuel, the SO _X scrubber 10 may be used only as a path through which the exhaust gas passes. That is, the exhaust gas discharged from a combustion engine SO _X scrubber 10, the via CO ₂ scrubber 100, but is supplied to, that does not inject the water into the interior of the SO _X scrubber 10 or the like for the reduction of SOx Separate processing may not be performed.

In addition, as described above, the system is further provided with a bypass pipe (not shown) directly connected from the exhaust gas inlet 11 of the _{SO X scrubber 10 to the exhaust gas inlet 110 of the CO 2 scrubber 100.} By configuring, it is also possible to directly supply the exhaust gas discharged from the combustion engine according to the use of low-sulfur oil fuel to the CO _{2 scrubber 100 .}

3-2)

Next, in a ship equipped with a carbon dioxide reduction system for a ship according to another embodiment of the present invention disclosed in FIG. 3 , when the ship uses high sulfur oil fuel, the exhaust discharged from the combustion engine through the direction change of the damper (D) After reducing sulfur oxides by supplying the gas to the SO _X scrubber 10 , exhaust gas treatment may be performed to be exhausted to the outside.

In addition, if further reduction of carbon dioxide is required at this time, as described above, the bypass pipe connected from the exhaust gas outlet 12 of the _{SO X} scrubber 10 to the exhaust gas inlet 110 of the _{CO 2 scrubber 100 (not shown)} city), the exhaust gas having reduced sulfur oxides is not directly exhausted to the outside, but _{is sent to the CO 2} scrubber 100 to be exhausted after the reduction of carbon dioxide is achieved.

When the ship uses low-sulfur fuel, the exhaust gas discharged from the combustion engine is supplied to the CO ₂ scrubber 100 through the direction change of the damper (D) to reduce carbon dioxide and then exhaust gas treatment is performed. do.

In the present invention, the high-sulfur oil may include bunker C oil, and the low-sulfur oil may include heavy oil A and marine gas oil (MGO). In general, heavy oil is classified into heavy oil A, heavy oil B, and heavy oil C according to its density and viscosity.

The present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, it should be said that such modifications or variations belong to the claims of the present invention.

10: SO _X scrubber
11: exhaust gas inlet
SL1: Seawater supply line
SL2: Seawater Discharge Line
100: CO ₂ scrubber
110: exhaust gas inlet
120: exhaust gas outlet
121: concentration analyzer
200: absorbent supply unit
210: absorbent circulation tank
220: absorbent storage tank
230: waste absorbent storage tank
L1: Absorbent supply line
L2: Absorbent discharge line
L3: waste absorbent discharge line

Claims (5)

an exhaust gas pipe through which exhaust gas is discharged from a combustion engine provided on a ship;
_{SO X} scrubber receiving the exhaust gas discharged through the exhaust gas pipe to reduce sulfur oxides;
a seawater supply unit for supplying seawater so as to be in gas-liquid contact with the exhaust gas into the SO _{X scrubber;
CO 2} scrubber for reducing carbon dioxide by receiving the exhaust gas discharged through the exhaust gas pipe; and
Including an absorbent supply unit for circulating and supplying a carbon dioxide absorbent to the CO _{2 scrubber,}
The exhaust gas pipe is branched into a first exhaust gas inlet pipe for introducing exhaust gas into _{the SO X} scrubber and a second exhaust gas inlet pipe for introducing exhaust gas into the CO _{2 scrubber,}
A damper for changing the direction of exhaust gas is installed at a branch point where the first exhaust gas inlet pipe and the second exhaust gas inlet pipe branch, so that the exhaust gas discharged from the combustion engine is separated from the SO _X scrubber and the characterized in that it is selectively supplied to any one of the CO _{2 scrubbers,}
A ship's carbon dioxide reduction system.
The method according to claim 1,
The absorbent supply unit,
an absorbent circulation tank for circulating and supplying the carbon dioxide absorbent into the CO _{2 scrubber;}
an absorbent storage tank for replenishing and storing a new absorbent into the absorbent circulation tank in order to maintain a constant concentration of the absorbent in the absorbent circulation tank; and
A waste absorbent storage tank for receiving and storing the waste absorbent from the absorbent circulation tank when the absorption capacity of the absorbent circulating from the absorbent circulation tank to the CO _{2 scrubber falls below a certain level and becomes a waste absorbent;}
A ship's carbon dioxide reduction system.
3. The method according to claim 2,
The absorbent is a liquid absorbent containing an amine absorbent or formic acid, characterized in that it is sprayed into _{the CO 2 scrubber through a spray nozzle,}
A ship's carbon dioxide reduction system.
The method according to claim 1,
a first exhaust gas discharge pipe through which exhaust gas is discharged from the SO _{X scrubber;}
a second exhaust gas discharge pipe through which exhaust gas is discharged from the CO _{2 scrubber;} and
Branched from the first exhaust gas outlet pipe and connected to the second exhaust gas inlet pipe, the SO _X scrubber further comprises a bypass pipe for supplying the reduced sulfur oxide exhaust gas to the CO _{2 scrubber,}
A ship's carbon dioxide reduction system.
5. The method according to claim 4,
When it is required to reduce sulfur oxides in the exhaust gas discharged from the combustion engine, the damper is controlled so that the _{exhaust gas flows into the SO X scrubber,}
When it is required to reduce carbon dioxide in the exhaust gas discharged from the combustion engine, the damper is controlled so that the _{exhaust gas flows into the CO 2 scrubber,}
If required both a reduction in the exhaust gas sulfur oxide and carbon dioxide in the emissions from the combustion engine, the exhaust gas doedoe said damper control such that flows into the SO _X scrubber, the by the exhaust gas discharged from the SO _X scrubber It is characterized in that the reduction of sulfur oxides and carbon dioxide is sequentially performed by supplying it to _{the CO 2} scrubber through a pass pipe,
A ship's carbon dioxide reduction system.

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