KR20170082367A - Apparatus for reducing air pollutant - Google Patents

Abstract

An exhaust pollutant abatement apparatus is provided according to an embodiment of the present invention.
An exhaust pollutant reduction apparatus according to an embodiment of the present invention includes an exhaust gas pipe for supplying exhaust gas of a combustion engine, a cleaning water supply pipe for supplying cleaning water, and a cleaning water supply pipe for exhaust gas supplied through the exhaust gas pipe An oxidizing unit connected to the exhaust gas pipe for discharging, irradiating ultraviolet rays or injecting an oxidizing agent to oxidize the exhaust gas, and an oxidizing unit connected to the exhaust gas pipe at the downstream end of the oxidizing unit, And a cleaning water discharge pipe for discharging the washing water in the scrubber.

Description

[0001] Apparatus for reducing air pollutant [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an exhaust pollutant abatement device, and more particularly, to an exhaust pollutant abatement device capable of purifying and discharging contaminants contained in exhaust gas of a combustion engine.

Generally, various engines installed on a ship generate power by burning fossil fuels. At this time, the exhaust gas generated in the combustion process of the fuel includes harmful substances such as SOx, NOx, and PM, It can cause pollution. For these reasons, environmental regulations for air pollution of vessels are being strengthened, and various processing devices are being applied to ships in order to satisfy various regulations.

In the environmental regulations on air pollution, regulations that specify the sulfur content in the exhaust gas emitted from the engine when operating and docking the marine emission control area (ECA) are less than 0.1% As a method for removal of cargo, ultra low sulfur fuel having a sulfur content of 0.1% or less may be used or a wet scrubber may be applied. However, since the ultra low-sulfur oil is very expensive and the system such as the production equipment is insufficient, a wet scrubber is usually used. A wet scrubber removes sulfur oxides by vapor-liquid contact with seawater, fresh water or alkaline solution and exhaust gas. Oxidation of sulfur oxides and nitrogen oxides before gas-liquid contact can reduce sulfur oxides and nitrogen oxides at the same time.

On the other hand, the sulfur oxides and nitrogen oxides oxidized before the gas-liquid contact can be easily reduced, and when the sulfur oxides and the nitrogen oxides are reduced again, the reduction effect is deteriorated.

Korean Patent Publication No. 10-2014-0123665 2014. 10. 23.

An object of the present invention is to provide an exhaust pollutant abatement apparatus capable of purifying and discharging contaminants contained in exhaust gas of a combustion engine.

The technical objects of the present invention are not limited to the technical matters mentioned above, and other technical subjects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided an exhaust pollutant reduction apparatus comprising an exhaust gas pipe for supplying exhaust gas from a combustion engine, a cleaning water supply pipe for supplying cleaning water, An oxidizing unit connected to the exhaust gas pipe for oxidizing the exhaust gas by discharging, irradiating with ultraviolet rays or injecting an oxidizing agent, and an oxidation unit connected to the exhaust gas pipe, A liquid catalyst injection unit connected to the exhaust gas pipe at a rear end thereof for injecting a liquid catalyst to maintain the exhaust gas in an oxidized state, and a rinse water discharge pipe for discharging rinse water inside the scrubber.

The liquid catalyst may be organic sulfoxides obtained by oxidizing organic sulfides contained in oil.

The liquid catalyst may have a weight ratio of water to sulfoxide of 30 to 70: 70 to 30.

The liquid catalyst may have a specific gravity of about 0.85.

The exhaust pollutant abatement apparatus further includes a separation unit connected to the cleaning water discharge pipe for separating the liquid catalyst contained in the washing water using the difference in specific gravity between the washing water and the washing water, And a circulation line for circulating the liquid catalyst separated in the separation unit to the liquid catalyst injection unit.

The exhaust pollutant abatement apparatus may further include a neutralizing agent supply unit connected to the scrubber to supply the neutralization agent.

The exhaust pollutant abatement apparatus may further include a pretreatment unit connected to the exhaust gas pipe at the front end of the oxidation unit and removing fine dust contained in the exhaust gas.

According to the present invention, it is possible to prevent the oxidized sulfur oxides and nitrogen oxides from being reduced again by injecting the liquid catalyst into the sulfur oxides and nitrogen oxides oxidized before gas-liquid contact. Therefore, the reduction effect of sulfur oxides and nitrogen oxides can be improved, and the oxidized exhaust gas passes through the wet scrubber and is double-purified, so that contaminants in the exhaust gas can be remarkably reduced.

1 is a schematic view of an exhaust pollutant reduction apparatus according to an embodiment of the present invention.
2 and 3 are operation diagrams of an exhaust pollutant reduction apparatus according to an embodiment of the present invention.
4 and 5 are operation diagrams of an exhaust pollutant abatement apparatus according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, an exhaust pollutant abatement apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG.

The apparatus for reducing exhaust pollutants according to an embodiment of the present invention reduces the concentration of various pollutants (nitrogen oxides, sulfur oxides, dusts, etc.) contained in exhaust gases to discharge air suited to exhaust standards, Can be performed at the same time, and it is possible to remove pollutants of the exhaust gas, which are mounted on the ship and generated in the ship, mainly.

The exhaust pollutant abatement apparatus can prevent the oxidized sulfur oxides and nitrogen oxides from being reduced again by injecting the liquid catalyst into the sulfur oxides and the nitrogen oxides oxidized before gas-liquid contact. Therefore, the reducing effect of sulfur oxides and nitrogen oxides can be improved, and the oxidized exhaust gas passes through the wet scrubber and is double-purified, thereby remarkably reducing pollutants in the exhaust gas.

Hereinafter, the exhaust pollutant abatement apparatus will be described in detail with reference to Fig.

1 is a schematic view of an exhaust pollutant reduction apparatus according to an embodiment of the present invention.

The exhaust pollutant abatement device 1 according to the present invention includes an exhaust gas pipe 10, a cleaning water supply pipe 20, a scrubber 30, an oxidation unit 40, a liquid catalyst injection unit 50, And a washing water discharge pipe 31.

The exhaust gas pipe 10 is connected to a scrubber 30, which will be described later, as a pipe through which exhaust gas moves from a combustion engine (not shown). The exhaust gas pipe 10 is directly connected to the exhaust pipe of the combustion engine and can be a passage through which hot exhaust gas is directly transferred or the exhaust gas passes through various heat exchangers to recycle most of the exhaust heat and the remaining waste gas moves. Here, the combustion engine refers to an apparatus that generates various kinds of power required for a ship by burning fuel, and may be formed of, for example, a main engine, a generator, or the like. The exhaust gas pipe 10 may be connected to exhaust pipes of a plurality of combustion engines, and a plurality of combustion engines may selectively operate. Such a combustion engine usually generates fossil fuel to generate power, and thus generates exhaust gas resulting from combustion of fossil fuel. The generated exhaust gas contains a large amount of nitrogen oxides, sulfur oxides, fine dust, etc., and is supplied to the scrubber 30 through the exhaust gas pipe 10 connected to one side of the combustion engine.

The cleaning water supply pipe 20 is connected to the seawater supply pipe 21 or the fresh water supply pipe 27 at one end thereof and supplies the cleaning water to at least one of the seawater or fresh water, And the other end may be connected to the scrubber 30. That is, the washing water supply pipe 20 can selectively supply seawater and fresh water to the scrubber 30. Hereinafter, the process of mainly supplying seawater into the scrubber 30 through the scrubbing water supply pipe 20 is limited mainly to the case where the scrubbing water is seawater.

The seawater supply pipe 21 is a pipe through which seawater is supplied from outside, and at least one pump P1 for pressurizing the seawater is installed to smoothly supply the seawater to the scrubber 30. [ However, the seawater supply pipe 21 is not limited to supplying the seawater to the scrubber 30, and may supply seawater to a ballast water tank (not shown) if necessary.

The washing water supply pipe 20 is branched to the scrubber 30 at one side of the sea water supply pipe 21 and the control valve 26 is installed at the connection portion between the sea water supply pipe 21 and the washing water supply pipe 20 have. The control valve 26 is formed in the form of a three-way valve so as to control the amount of seawater supplied to the cleansing water supply pipe 20 or the seawater supplied branched and supplied to the seawater supply pipe 21, Can be appropriately adjusted. The sea water supply pipe 21 is connected to the mixing pipe 23 and the sea water discharge pipe 24 at the rear end of the washing water supply pipe 20. In the mixing pipe 23, seawater injected with the neutralizing agent of the neutralizing agent supply unit 70 to be described later flows, and the seawater discharge pipe 24 can discharge seawater to the outside of the ship.

The seawater introduced from outside through the sea water supply pipe 21 flows through the washing water supply pipe 20 and is supplied to the scrubber 30. [ The scrubber 30 is a device for spraying the cleaning water supplied through the cleaning water supply pipe 20 to the exhaust gas supplied through the exhaust gas pipe 10 to bring the exhaust gas and the cleaning water into gas-liquid contact. The scrubber 30 can be a conventional wet scrubber have. At this time, the cleaning water supply pipe is disposed at the upper part of the scrubber 30 at the end located inside the scrubber 30, and the cleaning water can be branched into a plurality of sprays to spray the cleaning water in the form of fine particles. That is, the cleaning water supply pipe 20 disposed at the upper portion of the scrubber 30 sprays the cleaning water toward the lower portion of the scrubber 30 where the exhaust gas pipe 10 is located. Therefore, the exhaust gas flowing through the exhaust gas pipe 10 disposed at the bottom of the scrubber 30 can effectively contact the washing water. As the exhaust gas and washing water come into contact with the inside of the scrubber 30, contaminants such as nitrogen oxides, sulfur oxides, and fine dusts contained in the exhaust gas can be removed, and contamination such as nitrogen oxides, sulfur oxides, The exhaust gas from which the material has been removed can be discharged to the outside through a separate exhaust pipe 32. Since the exhaust gas discharged through the discharge pipe 32 is in a state in which contaminants such as nitrogen oxides, sulfur oxides, and fine dusts are removed, the exhaust gas can be discharged into the atmosphere in accordance with the exhaust standards.

The cleaning water containing nitrogen oxides, sulfur oxides, fine particles, etc., is discharged to the outside of the scrubber 30 through the cleaning water discharge pipe 31 in contact with the exhaust gas containing the pollutant. At this time, the cleansing water in the scrubber 30 dissolves nitrogen oxides and sulfur oxides to form strongly acidic nitric acid and sulfuric acid, so that the microorganisms contained in the cleansing water may be killed.

On the other hand, the exhaust gas supplied through the exhaust gas pipe 10 is primarily purified through the oxidation unit 40 and can be purified through the scrubber 30 in a second order.

The oxidation unit 40 is an apparatus for oxidizing the exhaust gas by pulsed corona discharge, irradiation of ultraviolet rays, or spraying of an oxidizing agent, and can be connected to the exhaust gas pipe 10. In other words, the nitrogen monoxide contained in the exhaust gas flowing through the exhaust gas pipe 10 can be oxidized to nitrogen dioxide by the oxidation unit 40. Since the nitrogen dioxide is easily dissolved in water as compared with the nitrogen monoxide, it can be easily dissolved in the washing water in the scrubber 30 and removed. In the case where the oxidizing unit 40 performs pulse corona discharge to oxidize the exhaust gas, when the corona discharge is caused by the pulse high voltage, the exhaust gas becomes a plasma state to generate ozone and oxidizing radicals such as O ₂ and OH, The cargo can be oxidized. Further, when the oxidation unit 40 injects the oxidizing agent to oxidize the exhaust gas, the liquid oxidizing agent can be made into a fine particle, dropletized or vaporized by using a nozzle, an ultrasonic vibrator, a spray, a heating plate or the like. Nitrogen oxides and sulfur oxides contained in the exhaust gas are reacted and oxidized according to the following reaction formula.

<Reaction Scheme>

NO + O → NO ₂

NO + H ₂ O → NO ₂ + OH

NO + OH → HNO ₂

HNO ₂ + OH → NO ₂ + H ₂ O

NO + O ₃ ? NO ₂ + O ₂

NO ₂ + OH - &gt; HNO ₃

SO ₂ + OH - &gt; HSO ₃

HSO ₃ + OH - &gt; H ₂ SO ₄

SO ₂ + O - &gt; SO ₃

SO ₃ + H ₂ O - &gt; H ₂ SO ₄

The exhaust gas puri fi ed through the oxidation unit 40 may pass through the liquid catalyst injection unit 50 before being supplied to the scrubber 30.

The liquid catalyst injection unit 50 is an apparatus for maintaining the exhaust gas in the oxidized state and can be connected to the exhaust gas pipe 10 at the downstream end of the oxidation unit 40. The exhaust gas that has been artificially oxidized by the oxidation unit 40 can be easily reduced to its original state again. When the exhaust gas is reduced again, the exhaust gas is not easily removed from the scrubbing water in the scrubber 30. Therefore, it is necessary to control the exhaust gas to be introduced into the scrubber 30 in an oxidized state. The liquid catalyst injection unit 50 injects the liquid catalyst into the oxidized exhaust gas to maintain the exhaust gas in the oxidized state. The liquid catalyst is organic sulfoxides obtained by oxidizing organic sulfides contained in oil such as petroleum or diesel, and the weight ratio of water and sulfoxide may be 30 to 70: 70 to 30 . By injecting the liquid catalyst, which is an organic sulfur oxide, into the oxidized exhaust gas, the exhaust gas can be supplied to the scrubber 30 without being reduced again, while maintaining the oxidation state. However, the liquid catalyst injection unit 50 is not limited to being connected to the exhaust gas pipe 10 at the downstream end of the oxidation unit 40, and the position of the liquid catalyst injection unit 50 may be variously modified. For example, the liquid catalyst injection unit 50 may be formed integrally or separately from the oxidation unit 40 inside the oxidation unit 40, or may be integrally or separately formed with the scrubber 30 inside the scrubber 30.

Meanwhile, the sulfuric acid and nitric acid generated in the scrubber 30 can be neutralized by the neutralizing agent supplied through the neutralizing agent supply unit 70. For example, the neutralizing agent may be an alkali solution, that is, sodium hydroxide (NaOH) or sodium hypochlorite (NaOCl), and may be obtained by electrolysis of seawater or the like. Accordingly, the neutralizing agent supply unit 70 may be formed of a neutralizing agent tank containing the neutralizing agent, or may be an apparatus for directly producing the neutralizing agent including the electrolyzing apparatus. In the case where the neutralizing agent supply unit 70 includes the electrolysis apparatus and directly produces the neutralizing agent, the neutralizing agent supply unit 70 is connected to one side of the neutralizing agent supply pipe 21 through the seawater inlet pipe 22, . At least one pump P2 is installed on the seawater inlet pipe 22 so that seawater can be supplied smoothly to the neutralizing agent supply unit 70.

The neutralizing agent supply unit 70 may supply the neutralizing agent to the scrubber 30 or the sea water supply pipe 21. When the neutralizing agent supply unit 70 supplies the neutralizing agent to the scrubber 30, the supply time point can be controlled such that the washing water comes in contact with the exhaust gas and then sequentially contacted. That is, the exhaust gas and the washing water come into contact first, microorganisms are killed by sulfuric acid and nitric acid, and then the neutralization agent is supplied to neutralize the washing water so that the washing water has an appropriate pH. Through this process, it is possible to remove pollutants of the exhaust gas in the scrubber 30, neutralize the washing water at the same time as to kill the microorganisms in the washing water.

An electrolytic tank 120 may be provided on the seawater inlet pipe 22 branched from the sea water supply pipe 21 or the sea water supply pipe 21 to supply the electrolytic solution to seawater. At this time, the electrolyte may be sodium chloride (NaCl). Since ships operate worldwide, the concentration of saline contained in seawater may be different depending on the area of operation. When the concentration of the salt contained in the seawater is too low, electrolysis in the neutralizing agent supply unit 70 is not smoothly performed, so that a neutralizing agent having a proper concentration may not be generated. The electrolytic tank 120 for supplying the electrolytic solution on the sea water supply pipe 21 or the sea water inflow pipe 22 is provided so that the electrolysis is smoothly performed in the neutralizing agent supply unit 70 even when seawater containing sodium chloride is introduced Whereby a neutralizing agent can be easily produced. The electrolyte tank 120 can selectively operate according to the concentration of the salt contained in the seawater.

The washing water discharge pipe 31 is a pipe for discharging the washing water in the scrubber 30 and may be connected to the sea water supply pipe 21 through the filter unit 80. That is, the washing water discharge pipe 31 can separate the solid particles contained in the washing water through the filter unit 80, and then discharge it to the outside. However, the washing water discharge pipe 31 is not limited to being connected to the sea water supply pipe 21, and the washing water discharge pipe 31 may be connected to the outside of the ship if necessary.

A separation unit 60 may be connected to the washing water discharge pipe 31. The separation unit 60 is a device for separating the liquid catalyst contained in the washing water, and can separate the liquid catalyst using the difference in specific gravity with the washing water. That is, the separation unit 60 separates the liquid catalyst contained in the washing water by the gravity separation method. The liquid catalyst has a specific gravity of about 0.85 and is smaller than the washing water. Therefore, the washing water having a relatively large specific gravity is disposed on the lower side of the separation unit 60, and the liquid catalyst having a small specific gravity is disposed on the upper side of the separation unit 60, so that the washing water and the liquid catalyst can be completely separated. However, the separating unit 60 is not limited to separating the liquid catalyst by the gravity separation method, and may be modified in various ways to separate the liquid catalyst contained in the washing water. By separating the liquid catalyst contained in the washing water by the separation unit 60, when the exhaust pollutant reduction apparatus 1 operates in an open loop, it is possible to prevent the liquid catalyst from being discharged outboard along with the washing water. The separated liquid catalyst can be circulated to the liquid catalyst injection unit 50.

The circulation line 61 is a tube for recycling the liquid catalyst separated in the separation unit 60 to the liquid catalyst injection unit 50 and can connect the separation unit 60 and the liquid catalyst injection unit 50 to each other. The circulation line 61 is opened when the washing water is discharged to the outside, that is, when the exhaust pollutant abatement device 1 operates in an open loop, and the liquid catalyst can be circulated to the liquid catalyst injection unit 50 .

The recycling tube 110 may also be connected to the washing water discharge pipe 31. The recycling pipe 110 is a pipe for recycling the washing water discharged through the washing water discharge pipe 31 to the washing water supply pipe 20 and may be connected to the washing water discharge pipe 31 at the rear end of the separation unit 60. The recirculation pipe 110 is opened when the washing water can not be discharged to the outside, that is, when the exhaust pollutant abatement device 1 operates in a closed loop, and circulates the washing water to the scrubber 30. [

The recycle tank 100 may be installed between the washing water discharge pipe 31 and the recycle pipe 110. The recycle tank 100 can store a part of the washing water discharged through the washing water discharge pipe 31 and functions as a buffer tank so that a certain amount of washing water can be circulated through the recycling pipe 110 can do. The recycle tank 100 may include any one of a centrifuge, a gravity separator, and a filter to separate the solid phase particles contained in the washing water and recycle it through the recycle tube 110.

The cleaning water supply pipe 20 is connected to the sea water supply pipe 21, the fresh water supply pipe 27 and the recirculation pipe 110 so that the concentration of the exhaust gas, the treatment capacity of the scrubber 30, The seawater, the fresh water, and the circulating water can be suitably mixed and supplied to the scrubber 30. [

The filter unit 80 separates the solid particles contained in the washing water discharged from the scrubber 30 at the rear end of the scrubber 30. The filter unit 80 includes a centrifugal separator, The solid phase particles can be separated and discharged to the sludge tank 90. The filter unit 80 can be connected to the sea water supply pipe 21 between the pump P1 and the control valve 26. [ That is, the seawater supplied from the seawater supply pipe 21 is supplied to the scrubber 30 through the cleaning water supply pipe 20 after passing through the filter unit 80, and the washing water, which has passed through the scrubber 30, (80). In other words, both the seawater externally introduced into one filter unit 80 and the washing water passing through the scrubber 30 can be filtered. However, the present invention is not limited to the use of one filter unit 80, and for example, a plurality of filter units 80 may be used. The plurality of filter units 80 can operate in common or independently for removing large particles contained in the washing water that has passed through the washing water discharge pipe 31 or in the seawater that has passed through the sea water supply pipe 21. [

The neutralizing agent can be injected into the washing water or seawater having passed through the filter unit 80 from the neutralizing agent supplying unit 70. The neutralizing agent may be injected into the mixing pipe 23 through which the mixed water of the seawater and the washing water is discharged and the mixing pipe 23 may connect the filter unit 80 and the sea water discharge pipe 24. The sensor unit 25 is provided on the sea water discharge pipe 24 so that at least one of the total residual oxidant, the pH value, and the microbial concentration contained in the washing water and the seawater discharged can be grasped in real time. For example, the sensor unit 25 may be a TRO (Total Residual Oxidant) sensor, and the neutralizing agent supply unit 70 may adjust the supply amount of the neutralizing agent according to the value measured by the sensor unit 25. The washing water and the seawater discharged through the mixing pipe 23 are discharged to the outside through the sea water discharge pipe 24.

Hereinafter, with reference to FIG. 2 and FIG. 3, the operation of the exhaust pollutant abatement apparatus 1 will be described in more detail.

2 and 3 are operation diagrams of an exhaust pollutant reduction apparatus according to an embodiment of the present invention.

The exhaust pollutant reduction apparatus 1 according to the present invention can prevent the oxidized sulfur oxides and nitrogen oxides from being reduced again by injecting the liquid catalyst into the sulfur oxides and nitrogen oxides oxidized before gas-liquid contact. Therefore, the reduction effect of sulfur oxides and nitrogen oxides can be improved, and the oxidized exhaust gas passes through the wet scrubber and is double-purified, so that contaminants in the exhaust gas can be remarkably reduced.

FIG. 2 is a view showing an open loop system in which seawater is discharged to the outside after passing through a scrubber, FIG. 3 is a view showing a closed loop system in which seawater is passed through a scrubber and then recycled through a recirculation pipe Fig.

2, some of the seawater introduced through the seawater supply pipe 21 is supplied to the scrubber 30 through the cleansing water supply pipe 20 and the remaining part of the seawater is supplied through the seawater inflow pipe 22 And is supplied to the neutralizing agent supply unit 70. The washing water is sprayed from the upper part of the scrubber 30 toward the lower part, and the washing water can be gradually filled in the lower part of the scrubber 30. [ At this time, the exhaust gas supplied through the exhaust gas pipe 10 can be injected from the lower part to the upper part of the scrubber 30 in the oxidized state after passing through the oxidation unit 40 and the liquid catalyst injection unit 50 in this order . The oxidizing unit 40 oxidizes the nitrogen monoxide contained in the exhaust gas into nitrogen dioxide by discharging, irradiating ultraviolet rays, or injecting an oxidizing agent. The liquid catalyst injecting unit 50 injects the liquid catalyst into the oxidized exhaust gas, Gt;

The neutralizing agent supply unit 70 may store or generate the neutralizing agent and may spray the neutralizing agent to the sea water supply pipe 21 or the scrubber 30 in consideration of the pH value of the washing water.

The exhaust gas is sprayed in the washing water filled in the lower part of the scrubber 30, whereby contaminants such as nitrogen oxides, sulfur oxides and fine dusts can be primarily removed. In addition, the cleaning water injected from the upper portion of the scrubber 30 can be removed by the second pollutant. Through this process, the pollutants in the exhaust gas are removed, and the exhaust gas from which the pollutants are removed is discharged to the outside through the exhaust pipe 32.

The washing water having passed through the scrubber 30 contains contaminants such as nitrogen oxides, sulfur oxides and fine dust particles and is discharged to the outside of the scrubber 30 through the washing water discharge pipe 31. Since the separation unit 60 is provided on the washing water discharge pipe 31, the liquid catalyst is separated from the washing water, circulated to the liquid catalyst injection unit 50 through the circulation line 61, Unit 80. &lt; / RTI &gt; The filter unit 80 separates contaminants such as solid particles in the washing water and stores them in the sludge tank 90. The cleansing water from which contaminants are separated is discharged to the outside of the ship through the sea water discharge pipe 24. When the total residual oxidant amount and pH value of the washing water passing through the seawater discharge pipe 24 measured by the sensor unit 25 are out of the reference value, the neutralizing agent is supplied from the neutralizing agent supplying unit 70 to the scrubber 30 or the mixing pipe 23) to adjust the total amount of residual oxidizing agent and pH value within the standard value, and then discharge it to the outside.

Meanwhile, when the seawater containing sodium chloride is introduced through the seawater supply pipe 21, the electrolyte tank 120 may supply the electrolyte to the seawater flowing through the seawater inflow pipe 22.

3, a part of the seawater introduced through the seawater supply pipe 21 is supplied to the scrubber 30, and a part of the seawater is supplied to the neutralizing agent supply unit 70. The washing water discharged through the scrubber 30 and discharged into the washing water discharge pipe 31 is temporarily stored in the recirculation tank 100 in a state including the liquid catalyst and then sent to the washing water supply pipe 20 through the recirculation pipe 110 . 3, except that the washing water discharged through the washing water discharge pipe 31 is recirculated to the washing water supply pipe 20 through the recirculation pipe 110 in a state including the liquid catalyst, The procedure is the same as that of Fig.

The liquid catalyst injected into the oxidized exhaust gas through the liquid catalyst injection unit 50 is supplied to the exhaust gas pipe 10, the scrubber 30, the washing water discharge pipe 31, the separation unit 60, And the process of FIG. 2 and the process of FIG. 3 may be performed in parallel with the contamination degree of the liquid catalyst.

The seawater introduced through the seawater supply pipe 21 is supplied to the cleaning water supply pipe 20, the scrubber 30, the washing water discharge pipe 31, the separation unit 60, the recycle tank 100, and the recycle pipe 110, And the process of FIG. 2 and the process of FIG. 3 can be performed in parallel with the contamination degree of the washing water, the pH value, and the like.

The process of FIG. 3 may be operated when the seawater can not be discharged to the outside, such as when the discharge of seawater is restricted, and the process of FIGS. 2 and 3 may be performed selectively or sequentially Can be operated.

4 and 5, the exhaust pollutant reduction apparatus 1 according to another embodiment of the present invention will be described in detail.

4 and 5 are operation diagrams of an exhaust pollutant abatement apparatus according to another embodiment of the present invention.

The exhaust pollutant abatement apparatus 1 according to another embodiment of the present invention further includes a pretreatment unit 130 for removing fine dust contained in the exhaust gas. The exhaust pollutant abatement device 1 according to another embodiment of the present invention is substantially the same as the above embodiment except that it further includes a pretreatment unit 130 for removing fine dust contained in the exhaust gas. Therefore, the description will be focused on, but unless otherwise noted, the description of the remaining components is replaced by the foregoing.

The pretreatment unit 130 is an apparatus for removing fine dust contained in the exhaust gas and may be connected to the exhaust gas pipe 10 at the front end of the oxidation unit 40. The pretreatment unit 130 may spray water molecules to the fine dust to reduce the fine dust concentration of the exhaust gas. However, the pretreatment unit 130 is not limited to spraying water molecules to the fine dust to reduce the fine dust concentration, and can be modified in various ways to reduce the concentration of the fine dust. For example, the pretreatment unit 130 may reduce the fine dust concentration using a separation membrane having a low transmittance of fine dust, or may reduce the fine dust concentration using a cyclone centrifuge.

The seawater supply pipe 21 may be branched at one side and connected to the preprocessing unit 130 and may inject the seawater introduced from the outside into the preprocessing unit 130. At this time, the seawater supply pipe 21 can supply the seawater branched and primarily filtered at the rear end of the filter unit 80 to the pretreatment unit 130, and a nozzle unit (not shown) is formed at the end thereof, . In addition, the fresh water supply pipe 27 may be branched on one side and connected to the pre-treatment unit 130, and may spray fresh water to the pre-treatment unit 130. At this time, a nozzle unit (not shown) is formed at the end of the fresh water supply pipe 27 so that clean water can be atomized and injected. That is, the preprocessing unit 130 can selectively receive mixed water of seawater, fresh water, seawater and fresh water. However, the present invention is not limited to the connection of the nozzle units to the ends of the sea water supply pipe 21 and the fresh water supply pipe 27, and may be modified into various structures capable of spraying sea water or fresh water into fine particles. For example, a water vapor generating unit (not shown) for generating water vapor may be coupled between the pretreatment unit 130 and the sea water supply pipe 21, or between the pretreatment unit 130 and the fresh water supply pipe 27. Here, the term "water vapor" does not mean only a complete gas state of water but may include a state in which liquid water is atomized to form small particles. The water vapor generated through the steam generating unit can be injected into the pre-processing unit 130 at a high pressure through a separate pump device.

The fine dust in the exhaust gas absorbs and sinks water molecules so that the oxidizing unit 40 can pass through the pretreatment unit 130. [ The concentration of fine dust in exhaust gas to be supplied to the exhaust gas can be reduced. By supplying the exhaust gas whose concentration of fine dust is reduced to the oxidation unit 40, it is possible to prevent the fine dust from being adsorbed on the electrode (not shown) which is located inside the oxidation unit 40 and induces pulse corona discharge . Therefore, the oxidation efficiency of the exhaust gas can be improved. In addition, when the oxidation unit 40 irradiates ultraviolet rays, it is possible to prevent the fine dust from blocking the irradiation path of ultraviolet rays, thereby improving the oxidation efficiency.

A collecting pipe 131 may be connected to one side of the pretreatment unit 130. The collecting pipe 131 collects the seawater or fresh water that has passed through the pretreatment unit 130 and supplies it to the washing water supply pipe 20. The collection pipe 131 can be selectively opened as needed. The collecting pipe 131 may supply seawater or fresh water that has passed through the pretreatment unit 130 to the recirculation pipe 110.

Figure 4 FIG. 5 is a view showing a closed loop system in which seawater is passed through a scrubber and then recirculated through a recirculation pipe 110. FIG. Fig.

4, a portion of the seawater introduced through the seawater supply pipe 21 is supplied to the scrubber 30 through the cleansing water supply pipe 20 and a part of the seawater is supplied to the neutralizer supply pipe 22 through the seawater inlet pipe 22. [ 70). The washing water is sprayed from above the scrubber 30, and the washing water can be filled at a certain level below the scrubber 30. At this time, the exhaust gas supplied through the exhaust gas pipe 10 passes through the pretreatment unit 130, the oxidation unit 40, and the liquid catalyst injection unit 50 in sequence, have. The pretreatment unit 130 receives the seawater from the seawater supply pipe 21 and injects the seawater into the fine dust and the seawater having passed through the pretreatment unit 130 can be supplied to the cleaning water supply pipe 20 through the collection pipe 131 . The oxidizing unit 40 oxidizes the nitrogen monoxide contained in the exhaust gas into nitrogen dioxide by discharging, irradiating ultraviolet rays, or injecting an oxidizing agent. The liquid catalyst injecting unit 50 injects the liquid catalyst into the oxidized exhaust gas, Gt;

The neutralizing agent supply unit may store or generate the neutralizing agent and may spray the neutralizing agent to the sea water supply pipe 21 or the scrubber 30. [

The exhaust gas is sprayed in the washing water filled in the lower part of the scrubber 30, whereby contaminants such as nitrogen oxides, sulfur oxides and fine dusts can be primarily removed. In addition, contaminants may be removed from the scrubber 30 by the washing water sprayed on the scrubber 30. Through this process, the pollutants in the exhaust gas are removed, and the exhaust gas from which the pollutants are removed is discharged to the outside through the exhaust pipe 32.

The washing water having passed through the scrubber 30 contains contaminants such as nitrogen oxides, sulfur oxides and fine dust particles and is discharged to the outside of the scrubber 30 through the washing water discharge pipe 31. The washing water flowing in the washing water discharge pipe 31 passes through the separation unit 60 and the liquid catalyst is separated and the separated liquid catalyst can be circulated to the liquid catalyst injection unit 50 through the circulation line 61 . The cleansing water from which the liquid catalyst has been separated moves to the filter unit 80 to remove contaminants such as solid particles and the contaminants are stored in the sludge tank 90. The cleansing water from which contaminants have been removed is discharged through the seawater discharge pipe 24 ) To the outside of the ship.

5, a part of the seawater introduced through the seawater supply pipe 21 is supplied to the scrubber 30, and a part of the seawater is supplied to the neutralizing agent supply unit 70. The washing water that has passed through the scrubber 30 and discharged to the washing water discharge pipe 31 is temporarily stored in the recirculation tank 100 in a state including the liquid catalyst and is supplied to the washing water supply pipe 20 through the recirculation pipe 110 . That is, the process of FIG. 5 is the same as that of FIG. 4 except that the washing water is not discharged to the outside of the tank, but is recycled to the washing water supply pipe 20 through the recycle pipe 110 including the liquid catalyst.

The process of FIG. 5 may be operated when the seawater can not be discharged to the outside, such as when the discharge of seawater is restricted, and the processes of FIGS. 4 and 5 may be performed selectively or sequentially Can be operated.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1: exhaust pollutant abatement device
10: Exhaust gas pipe 20: Cleaning water supply pipe
21: Sea water supply pipe 22: Sea water inflow pipe
23: mixing tube 24: seawater discharge pipe
25: sensor part 26: control valve
27: fresh water supply pipe 30: scrubber
31: rinse water discharge pipe 32: discharge pipe
40: oxidation unit 50: liquid catalyst injection unit
60: separation unit 61: circulation line
70: Neutralizing agent supply unit 80: Filter unit
90: sludge tank 100: recirculation tank
110: Recirculation tube 120: Electrolyte tank
130: preprocessing unit 131: collection pipe

Claims (7)

An exhaust gas pipe for supplying exhaust gas of a combustion engine;
A cleaning water supply pipe for supplying cleaning water;
A scrubber for spraying the washing water supplied through the washing water supply pipe to the exhaust gas supplied through the exhaust gas pipe;
An oxidizing unit connected to the exhaust gas pipe for oxidizing the exhaust gas by discharging, irradiating ultraviolet rays or injecting an oxidizing agent;
A liquid catalyst injection unit connected to the exhaust gas pipe at a downstream end of the oxidation unit and injecting a liquid catalyst to maintain the exhaust gas in an oxidized state; And
And a rinse water discharge pipe for discharging rinse water inside the scrubber. The exhaust pollutant abatement device according to claim 1, wherein the liquid catalyst is organic sulfoxides obtained by oxidizing an organic sulfide contained in oil. The exhaust pollutant abatement apparatus according to claim 2, wherein the liquid catalyst has a weight ratio of water to sulfoxide of 30 to 70: 70 to 30. The exhaust pollutant abatement apparatus according to claim 3, wherein the liquid catalyst has a specific gravity of about 0.85. The washing machine according to claim 1, further comprising: a separating unit connected to the washing water discharge pipe and separating the liquid catalyst contained in the washing water by using a specific gravity difference with washing water; And
And a circulation line connecting the separation unit and the liquid catalyst injection unit to circulate the liquid catalyst separated in the separation unit to the liquid catalyst injection unit. The exhaust pollutant reduction device according to claim 1, further comprising a neutralizing agent supply unit connected to the scrubber to supply a neutralizing agent. The exhaust pollutant abatement device according to claim 1, further comprising a pretreatment unit connected to the exhaust gas pipe at the front end of the oxidation unit, for removing fine dust contained in the exhaust gas.

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