KR20190070694A - Water treatment system - Google Patents

Abstract

The present invention relates to a polluted water treatment system. According to an embodiment of the present invention, the polluted water treatment system may comprise: an exhaust gas pipe which oxidizes and supplies exhaust gas of a combustion engine mounted on a marine structure; a cleaning water supply pipe which supplies cleaning water; a scrubber respectively connected to the exhaust gas pipe and the cleaning water supply pipe to allow the oxidized exhaust gas to come in contact with the cleaning water; a cleaning water discharge pipe which discharges the cleaning water inside the scrubber; a cleaning water storage tank connected to the cleaning water discharge pipe to store the cleaning water discharged from the scrubber, and to have one side connected to a cleaning water circulation pipe to circulate a part of the cleaning water to the scrubber; a neutralizing agent supply unit which supplies a neutralizing agent into the cleaning water storage tank; and a fresh water generator module connected to the cleaning water discharge pipe on a rear end of the cleaning water storage tank to receive the cleaning water including salt, which is generated by a reaction between the cleaning water and the neutralizing agent inside the cleaning water storage tank, to convert the cleaning water into clear water, and to discharge the clear water. The present invention aims to provide the polluted water treatment system, which can reduce energy consumption and treat polluted cleaning water by purifying exhaust gas.

Description

[0001] Water treatment system [0002]

The present invention relates to a polluted water treatment system, and more particularly, to a polluted water treatment system capable of treating clean water contaminated by purification of exhaust gas while reducing energy consumption.

Generally, various engines installed on a ship generate power by burning fuel, and the exhaust gas generated in the combustion process of the fuel is harmful substances such as nitrogen oxides (NOx), sulfur oxides (SOx) and fine dusts (PM) . In particular, the emission of nitrogen oxides and sulfur oxides in the exhaust gas has been increasingly recognized by the International Maritime Organization (IMO), an affiliate of the United Nations, ) Are the representative air pollutants subject to emission regulation. In the case of nitrogen oxides, emissions are regulated to 3.4 g / kwh or less in 2016, which is the time when Tier III is in effect. In the case of sulfur oxides, emissions from sulfur dioxide emission control (SECA) Is regulated. Accordingly, various apparatuses and methods for treating the exhaust gas of ships have been introduced. In the case of sulfur oxides, a method of removing the sulfur oxides by a wet scrubber is generally used. When the exhaust gas is oxidized in advance by using hydrogen peroxide, ozone, ultraviolet rays or the like and then brought into gas-liquid contact with the washing water, sulfur oxides and nitrogen oxides are simultaneously reduced .

On the other hand, when the sulfur oxides and the nitrogen oxides are oxidized and dissolved in the washing water, sulfate and nitrates are produced. Since nitrate is subject to regulation on the amount that can be discharged to the sea, clean water containing nitrate of a certain concentration or higher can not be discharged. However, since various engines installed on the ship continuously burn the fuel to generate necessary power and accordingly, the sulfate and nitrate are continuously generated in the process of exhaust gas discharged, a plurality of tanks for storing the fuel must be provided do. Therefore, the cost for installing and maintaining the tank is increased, and a large space is required for arranging a plurality of tanks, thereby reducing the space utilization in the ship. Thus, although only the washing water containing nitrate is stored after the washing water is cooled to precipitate the sulfate, there is a problem that the energy consumption is large during the forced cooling of the washing water.

Korean Patent Publication No. 10-2016-0128308 (2016.11.07)

SUMMARY OF THE INVENTION The present invention provides a contaminated water treatment system capable of treating clean water contaminated by purification of exhaust gas while reducing energy consumption.

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 a contaminated water treatment system including an exhaust gas pipe for oxidizing and supplying exhaust gas from a combustion engine mounted on an offshore structure, a cleansing water supply pipe for supplying cleansing water, A scrubber for connecting the exhaust gas pipe and the cleaning water supply pipe to each other and gas-liquid-contacting the oxidized exhaust gas and the cleaning water; a rinse water discharge pipe for discharging the rinse water inside the scrubber; A scrubbing water storage tank for storing the scrubbing water discharged from the scrubber, a cleaning water circulating pipe connected to one side for circulating a part of the scrubbing water to the scrubber, A neutralizing agent supply unit connected to the washing water discharge pipe at the rear end of the washing water storage tank, Group receiving the washing water and the neutralizing agent is supplied to the number of the cleaning, including the resulting salt reacted includes the crude manipulation module for discharging converted into fresh water.

The water purifier module may include an evaporator for evaporating the washing water containing the salt by heat exchange with steam, and a condenser for exchanging heat with the seawater to condense the washing water evaporated in the evaporator to generate the purified water .

The steam may be generated in the scrubber by the gas-liquid contact between the exhaust gas and the washing water, or may be generated in the boiler.

The contaminated water treatment system includes a filtration unit connected to the cleansing water discharge pipe between the cleansing water storage tank and the water purifier module and separating the solid phase particles contained in the cleansing water containing the salt, And a bleed-off cleansing water tank connected to the cleansing water discharge pipe at the rear end.

Wherein the contaminated water treatment system is branched from the cleansing water discharge pipe at the rear end of the bleed-off cleansing water tank and connected to the bleed-off cleansing water tank or is connected to one side of the bleed-off cleansing water tank outside the bleed- And an ejector provided on the circulation pipe, wherein the ejector includes: a nozzle unit that ejects the cleansing water including the salt introduced into the circulation tube at a high speed; And a suction part which is interposed between the nozzle part and the diffuser part and has one side connected to the evaporator part, wherein the washing water containing the salt When the nozzle unit is blown to the diffuser unit, a negative pressure is formed in the suction unit, so that the inside of the water purifier module can be maintained at a negative pressure.

The contaminated water treatment system may further include a gas outlet formed at one side of the bleed-off rinse solution tank for discharging the gas inside the bleed-off rinse solution tank.

The contaminated water treatment system may further include a porous net disposed between the evaporator and the condenser to prevent the solid particles including the salt precipitated in the evaporator from moving to the condenser.

The contaminated water treatment system may further include a fresh water circulation pipe for supplying the fresh water generated in the condenser to the boiler, the scrubber or the wash water supply pipe.

According to the present invention, the washing water containing sulfate or nitrate produced by the purification of the exhaust gas is evaporated and condensed in the generator module to generate fresh water, so that the amount of washing water containing the salt can be reduced. Therefore, it is possible to reduce the volume of the tank for storing the cleansing water containing the salt, and if necessary, the separate tank for storing the cleansing water containing the salt can be omitted, so that the cost for installing and maintaining the tank And the space utilization in the ship can be increased.

In addition, it is possible to reduce the energy consumed when the washing water containing the salt is forcibly cooled to precipitate the sulfate or nitrate, and it can be realized by adding only the piping to the scrubber and the generator module. There is an advantage that it is easy.

1 is a block diagram schematically illustrating a contaminated water treatment system according to an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion A in Fig. 1. Fig.
3 and 4 are operation diagrams for explaining the operation of the polluted water treatment system.

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, a polluted water treatment system according to an embodiment of the present invention will be described in detail with reference to Figs. 1 to 4. Fig.

The polluted water treatment system according to an embodiment of the present invention is an apparatus for purifying exhaust gas and treating polluted clean water, and can be mainly mounted on an offshore structure such as a ship.

The contaminated water treatment system can reduce the amount of cleansing water containing salts by evaporating and condensing the cleansing water containing the sulfate or nitrate produced by the purification of the exhaust gas in the generator module. Therefore, it is possible to reduce the volume of the tank for storing the cleansing water containing the salt, and if necessary, the separate tank for storing the cleansing water containing the salt can be omitted, so that the cost for installing and maintaining the tank And the space utilization in the ship can be increased. In addition, it is possible to reduce the energy consumed when the washing water containing the salt is forcibly cooled to precipitate the sulfate or nitrate, and it can be realized by adding only the piping to the scrubber and the generator module. This is an easy feature.

Hereinafter, the contaminated water treatment system 1 will be described in detail with reference to Figs. 1 and 2. Fig.

FIG. 1 is a block diagram schematically showing a contaminated water treatment system according to an embodiment of the present invention, and FIG. 2 is an enlarged view of part A of FIG.

The contaminated water treatment system 1 according to the present invention includes an exhaust gas pipe 10, a cleaning water supply pipe 20, a scrubber 30, a neutralizing agent supply unit 40, a cleaning water discharge pipe 50, Module 60 as shown in FIG.

The exhaust gas pipe 10 is connected to a scrubber 30 to be described later as a pipe for supplying exhaust gas generated in a combustion engine 100 mounted on an offshore structure. The exhaust gas pipe 10 is directly connected to the exhaust port of the combustion engine 100 to supply exhaust gas at a high temperature or pass through various heat exchangers to utilize most of the exhaust heat and supply the remaining waste gas. Here, the combustion engine 100 is an apparatus that generates various kinds of power required for an offshore structure by burning fuel, and may be formed of, for example, a main engine or a generator. The exhaust gas pipe 10 may be connected to the exhaust port of the plurality of combustion engines 100, and the plurality of combustion engines 100 may selectively operate. The combustion engine 100 generally generates power by burning fossil fuel, and thus generates exhaust gas resulting from combustion of the fossil fuel. The generated exhaust gas contains a large amount of nitrogen oxides, sulfur oxides, organic substances, fine dusts and the like and is supplied to the scrubber 30 through the exhaust gas pipe 10 connected to one side of the combustion engine 100.

The exhaust gas flowing through the exhaust gas pipe 10 can be supplied to the scrubber 30 after being oxidized. The exhaust gas may be oxidized by an oxidant injected into the exhaust gas pipe 10. The oxidant may be hydrogen peroxide (H ₂ O ₂ ), permanganate (HMnO ₄ ), hypobromic acid (HBrO), disodium fluoride (ClO ₂ ) It may be one of sodium hypochlorite (NaOCl), triplet salt (KHSO ₅ ), and ozone (O ₃ ). By injecting an oxidizing agent into the exhaust gas pipe 10 to oxidize the exhaust gas, the nitrogen monoxide contained in the exhaust gas can be oxidized to nitrogen dioxide. Since nitrogen dioxide is easily dissolved in water as compared with nitrogen monoxide, it can be easily dissolved and removed in the scrubber 30. The oxidizing agent can be atomized, dropletized or vaporized by a nozzle, an ultrasonic vibrator, a spray, a heating plate or the like to increase the oxidation efficiency of the exhaust gas. The nitrogen oxides contained in the exhaust gas are reacted and oxidized according to the following reaction formula.

<Reaction Scheme>

H ₂ O ₂ ^- &gt; H ₂ O + O ^-

NO + O ^- → NO ₂

However, the exhaust gas is not limited to be oxidized by an oxidizing agent, and may be oxidized by, for example, a pulse corona discharge or oxidized by ultraviolet light. In the case of oxidizing the exhaust gas by pulsed corona discharge, when the corona discharge is caused by the pulse high voltage, the exhaust gas becomes a plasma state, and oxidizing radicals such as ozone and O ₂ and OH are generated to oxidize nitrogen oxides and sulfur oxides .

The cleansing water supply pipe 20 is a pipe for supplying at least one cleansing water of seawater or fresh water or mixed water of seawater and fresh water to the scrubber 30. One end of the cleansing water supply pipe 20 is connected to a seawater inlet (sea- 80 and the other end thereof 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 clean water to the scrubber 30 through the cleansing water supply pipe 20 is limited mainly to the case where the cleansing water is fresh water. One end of the cleaning water supply pipe 20 is connected to the fresh water storage tank 75 through a fresh water circulation pipe 76 to be described later and the other end is connected to the scrubber 30. [ At this time, at least one pump is provided on the cleansing water supply pipe 20 so that fresh water stored in the fresh water storage tank 75 can be smoothly supplied to the scrubber 30. [

As described above, the exhaust gas pipe 10 and the cleaning water supply pipe 20 are connected to the scrubber 30, respectively, and the scrubber 30 can be brought into gas-liquid contact by spraying cleaning water to the exhaust gas supplied by oxidation. The scrubber 30 is provided with a spray nozzle 33 for spraying the washing water in the form of fine particles therein, and the spray nozzles 33 can be branched into a plurality of lines and arranged in a line along the flow direction of the exhaust gas. By arranging the plurality of injection nozzles 33 in a line along the flow direction of the exhaust gas, the contact area between the exhaust gas and the washing water and the number of times of contact are increased, and nitrogen oxides, sulfur oxides, fine dusts The pollutant can be effectively removed. The exhaust gas from which pollutants such as nitrogen oxides, sulfur oxides, and fine dust are removed can be discharged to the outside through the exhaust pipe 30a. The exhaust gas discharged through the exhaust pipe 30a can be freed of the pollutants such as nitrogen oxides, sulfur oxides and fine dusts to a level suitable for exhaust standards and released as it is in the atmosphere.

The scrubber 30 includes a first contact portion 31 and a second contact portion 32.

The first contact portion 31 is a tubular member constituting one side of the scrubber 30, and the upper portion can communicate with the exhaust gas pipe 10. The upper portion of the first contact portion 31 communicates with the exhaust gas pipe 10 so that the exhaust gas flowing into the first contact portion 31 flows downward and comes into gas-liquid contact with the washing water and the oxidizing agent. The first contact portion 31 may be provided with a stirring panel 34 for inducing the rotational flow of the exhaust gas and a mixer 35 for mixing the washing water and the exhaust gas. The exhaust gas that rotates by the stirring panel 34 is mixed with the washing water by the mixer 35 so that the contaminants contained in the exhaust gas can be effectively removed and the temperature of the exhaust gas is lowered, And the volume can be reduced. Further, when the exhaust gases having different pressures are mixed, it is also possible to prevent a part of the exhaust gas from flowing backward in the direction opposite to the flow due to the pressure difference. Although the spray nozzle 33, the stirring panel 34, the mixer 35 and the spray nozzle 33 are arranged in this order along the flow direction of the exhaust gas in the first contact portion 31, And the arrangement can be variously modified. The first contact portion 31 is in communication with the second contact portion 32.

The second contact portion 32 is a tubular member that forms the other side of the scrubber 30. The lower side communicates with the first contact portion 31 to form a refracting portion and the upper side can communicate with the exhaust pipe 30a. The lower portion of the second contact portion 32 communicates with the first contact portion 31 and the upper portion communicates with the exhaust pipe 30a so that the exhaust gas flowing downward along the first contact portion 31 flows into the second contact portion 32, The gas may flow upward and be discharged through the exhaust pipe 30a. Further, the second contact portion 32 communicates with the first contact portion 31 to form a U-shaped refracting portion, so that the flow path of the exhaust gas inside the scrubber 30 becomes longer and the contact time between the exhaust gas and the washing water becomes longer So that the effect of reducing pollutants can be maximized. The second contact portion 32 may be provided with a mixer 35 on the lower side communicating with the first contact portion 31 and a plurality of injection nozzles 33 may be disposed along the flow direction of the exhaust gas. The second contact portion 32 may be provided with a droplet separator 36 for condensing the moisture particles contained in the exhaust gas in an upper portion contacting the exhaust pipe 30a. Therefore, the water particles can be removed from the exhaust gas containing the water particles in contact with the washing water, and the exhaust gas can be discharged through the exhaust pipe 30a in a dried state. Further, the water particles removed from the exhaust gas fall downward, and the exhaust gas flowing upward can again be brought into gas-liquid contact, and the remaining contaminants may be further removed. An exhaust fan 37 for forcedly flowing exhaust gas and discharging the exhaust gas to the outside is provided on the second contact portion 32 or the exhaust pipe 30a at the upper end of the liquid separator 36 to pass through the stirring panel 34 and the mixer 35 And can partially reduce the pressure of the increased exhaust gas.

The washing water in the scrubber 30 is discharged through the washing water discharge pipe 40.

The cleaning water discharge pipe 40 is a pipe for discharging the washing water in the scrubber 30. The cleaning water discharge pipe 40 is connected to the refracting portion between the first contact portion 31 and the second contact portion 32 at one end, 0.0 &gt; 70 &lt; / RTI &gt; The washing water discharge pipe 40 is connected to the refracting portion between the first contacting portion 31 and the second contacting portion 32 so as to be sprayed to the first contacting portion 31 and the second contacting portion 32, The number can be smoothly discharged. At least one pump is provided on the washing water discharge pipe 40 so that the washing water can be smoothly supplied to the water generator module 70.

A washing water storage tank 50 may be connected to the washing water discharge pipe 40.

The washing water storage tank 50 is connected to a lower portion of the scrubber 30 to store washing water discharged from the scrubber 30. A washing water circulating pipe 51 is connected to one side of the washing water storage tank 50, ). &Lt; / RTI &gt; In addition, a neutralizing agent supply unit 60 may be connected to one side of the washing water storage tank 50.

The neutralizing agent supply unit 60 supplies the neutralizing agent to the washing water storage tank 50 and neutralizes the acidified nitriding oxide and sulfuric acid as they come into contact with the exhaust gas. For example, the neutralizing agent can be obtained by electrolyzing seawater or the like with an alkali solution such as sodium hydroxide (NaOH) or sodium hypochlorite (NaOCl) or ammonia water. The neutralizing agent supply unit 60 may be a tank in which a neutralizing agent is simply stored or an apparatus for directly producing a neutralizing agent including an electrolytic apparatus. The pH of the washing water can be adjusted by neutralizing the washing water that has been acidified by supplying the neutralizing agent to the neutralizing agent supplying unit 60. The scrubber 30 or the cleansing water storage tank 50 may be provided with a sensor (not shown) for measuring the pH of the cleansing water therein, and the neutralizing agent supply unit 60 may include a pH value sensor The amount of the neutralizing agent supplied may be adjusted. The neutralizing agent supplied from the neutralizing agent supply unit 60 reacts with contaminants of the exhaust gas dissolved in the washing water to form a sulfate (Na ₂ SO ₄ ) and a nitrate (NaNO ₃ ). In other words, the washing water stored in the washing water storage tank 50 becomes a state in which the contaminants dissolved in the washing water react with the neutralizing agent to contain the salt, and a part of the washing water passes through the washing water circulating pipe 51, And the rest is supplied to the water purifier module 70 through the rinse water discharge pipe 40.

The washing machine module 70 converts the washing water containing the salt into clean water and discharges the washing water. The washing water discharge pipe 40 extending from the washing water storage tank 50 is connected to the one side, Cleaning water can be supplied. The water generator module 70 includes an evaporator 71 and a condenser 72.

The evaporator 71 may include a heat exchanger for evaporating the washing water containing the salt supplied through the washing water discharge pipe 40 by heat exchange with steam. At this time, steam may be supplied from the scrubber 30 or supplied from the boiler 200. The steam supplied to the scrubber 30 may be generated due to gas-liquid contact between the exhaust gas and the washing water, and may be circulated to the scrubber 30 after heat exchange with the washing water in the evaporator 71. The steam supplied from the boiler 200 can be used as hot water after heat exchange with washing water or discharged to the sea. In the drawings, a pipe for supplying steam in the boiler 200 and a pipe for supplying steam in the scrubber 30 are joined to each other and extend to the evaporator 71. However, the present invention is not limited thereto, Section 71 as shown in Fig. The washing water containing salt is evaporated by heat exchange with the steam so that the volume of the washing water can be reduced and the volume of the tank for storing the washing water can be reduced and a separate tank for storing the washing water can be omitted do. Therefore, the cost for installing and maintaining the tank can be reduced, and the space utilization in the ship can be increased. In addition, since the amount of cleansing water is reduced and the salt is concentrated to a high concentration, not only the treatment is easy, but also the utilization value of the salt is increased. For example, salts concentrated at high concentrations can be supplied to separate treatment facilities and used as fertilizer materials when ships arrive at ports and the like.

The water in the vapor state evaporated in the evaporator 71 is discharged to the condenser 72. The condensing section 72 may include a heat exchanger for generating clean water by condensing the washing water evaporated in the evaporating section 71 with the sea water and performing heat exchange with the sea water. At this time, the seawater is introduced from the seawater inlet (s) and can be discharged to the off-shore area after heat exchange with the washing water, or can be utilized in various necessary places. The water in the water vapor state is heat-exchanged with the seawater and is condensed to generate fresh water, and the generated fresh water can be discharged through the fresh water discharge pipe 74 connected to one side. Fresh water discharged through the fresh water discharge pipe 74 is stored in the fresh water storage tank 75 and at least one of the fresh water discharge pipe 74 or the fresh water storage tank 75 is provided with a salt measurement sensor The concentration of the contained salts may also be measured. If necessary, the generated fresh water may be discharged outboard, and pH, PAH, turbidity, and nitrate may be measured using a salt measurement sensor before discharging the fresh water to the outboard, And can only be discharged outboard. Fresh water can be circulated to the rinse water storage tank 50 if it does not meet the marine emission standard.

The fresh water storage tank 75 is connected to a fresh water circulation pipe 76 and the fresh water circulation pipe 76 can be connected to the boiler 200 or the scrubber 30 or the wash water supply pipe 20 to supply clean water. That is, the exhaust gas is purified in the scrubber 30 and the contaminated washing water is converted into clean water in the water generator module 70 and then supplied to the scrubber 30 or to the boiler 200. The washing water can be used more efficiently by converting the contaminated washing water into clean water and recycling it so that the piping connected to the scrubber 30 and the water generator module 70 at the seawater inlet s is omitted . Therefore, the cost can be reduced, and the device configuration can be simplified.

A porous net 73 may be interposed between the evaporator 71 and the condenser 72. The porous net body 73 is for preventing the solid particles including the salt precipitated in the water vapor from moving to the condenser 72 as the washing water evaporates in the evaporator 71. For example, Shaped member having a sieve formed by weaving a plurality of sheets in a longitudinal and lateral directions. The porous net body 73 may be formed in a single piece and interposed between the evaporating portion 71 and the condensing portion 72, or a plurality of the porous netting bodies 73 may be disposed to overlap with each other.

The filtration unit 80 and the bleed-off cleansing water tank 90 may be sequentially connected to the cleansing water discharge pipe 40 between the cleansing water storage tank 50 and the water purifier module 70.

The filtration unit 80 separates the solid particles contained in the washing water containing the salt, and may include any one of a centrifuge, a gravity separator, and a filter. The solid phase particles, such as organic materials and solid state salts, have a larger specific gravity than the washing water and can therefore be separated from the washing water through centrifugation or gravity separation or filtration. The solid-state particles contained in the washing water contain pollutants contained in the exhaust gas, and may be sticky due to their high viscosity. When they are not removed, they are accumulated in the washing water discharge pipe 40 and various devices It may cause clogging, corrosion, corrosion or breakdown of the equipment. In order to prevent this, the filtration unit 80 is disposed to remove the solid particles, and the solid particles separated in the filtration unit 80 can be discharged to the sludge tank 81. The solid particles stored in the sludge tank (81) may be diluted with the washing water composed of seawater or fresh water and discharged to the sea within the discharge standard when the water is out of the regulated sea area. The cleansing water from which the solid-phase particles have been removed from the filtration unit 80 moves to the bleed-off cleansing water tank 90 through the cleansing water discharge pipe 40.

The bleed-off rinsing water tank 90 is connected to the rinsing water discharge pipe 40 at the rear end of the filtration unit 80 to store rinsing water in which solid particles have been removed. The cleansing water in which the solid phase particles stored in the bleed-off cleansing water tank 90 have been removed is supplied to the evaporating portion 71 and evaporated. The salt dissolved in the cleansing water in the liquid state is evaporated in the evaporating portion 71 Can be precipitated.

The circulation pipe 91 can be branched to the washing water discharge pipe 40 at the rear end of the bleed-off washing water tank 90. One end of the circulation pipe 91 is connected to the rinse water discharge pipe 40 at the rear end of the bleed-off rinse solution tank 90 and the other end is connected to the bleed off rinse water tank 90, A part of the washing water to be circulated to the bleed-off washing water tank 90 can be circulated. Control valves V1 and V2 for controlling the flow of the washing water are formed on the washing water discharge pipe 40 connected to the evaporator 71 and the circulation pipe 91 connected to the ejector 92 , It is possible to independently control the flow rate flowing into the evaporator (71) and the flow rate flowing into the ejector (92). However, the circulation pipe 91 is not limited to be branched to the bleed-off rinse solution tank 90 at the rear end of the bleed-off rinse solution tank 90 at the rear end of the bleed-off rinse solution tank 90, Off cleaning water tank 90 may be connected to one side of the bleed-off cleaning water tank 90 from the outside of the bleed-off cleaning water tank 90.

An ejector 92 is provided on the circulation pipe 91.

The ejector 92 is a known device and can keep the inside of the evaporator 71 at a negative pressure to induce smooth evaporation of the washing water. Specifically, the ejector 92 has a nozzle portion 92a for ejecting the washing water flowing into the circulation pipe 91 at a high speed and a diffuser portion 92b for discharging the washing water having passed through the nozzle portion 92a to the circulation pipe 91. [ And a suction portion 92c interposed between the nozzle portion 92a and the diffuser portion 92b and having one side connected to the evaporator portion 71 through the suction pipe 93. [ The nozzle unit 92a ejects the washing water containing the salt flowing through the circulation pipe 91 at high speed and the washing water sprayed at the nozzle unit 92a at high pressure moves to the diffuser unit 92b, And a negative pressure is formed in the pressure chamber 92c. When a negative pressure is formed in the suction portion 92c, the inside of the evaporator 71 connected to the suction portion 92c through the suction pipe 93 becomes a vacuum state by a negative pressure, so that the washing water can be evaporated at a low temperature. At this time, the inside of the condensing portion 72 communicating with the evaporating portion 71 can also be a negative pressure. The washing water containing the salt not evaporated in the evaporator 71 and the salt precipitated by evaporation of the washing water in the evaporator 71 may be sucked into the suction pipe 93 or the suction pipe 93, The washing water and the salt may be mixed with the washing water jetted at a high speed from the nozzle unit 92a and circulated to the bleed off washing water tank 90 through the circulation pipe 91 connected to the diffuser unit 92b. A part of the washing water containing the salt circulated to the bleed-off washing water tank 90 is supplied to the evaporator 71 through the washing water discharge pipe 40 and the remaining part of the wash water is supplied to the nitrate storage tank The washing water can be transferred to the bleed-off washing water tank 94. A gas outlet 90a may be formed on one side of the bleed-off washing water tank 90. [ The gas outlet 90a discharges the gas inside the bleed-off cleansing water tank 90, and at least one of them may be formed on the upper side of the bleed-off cleansing water tank 90. When the washing water ejected from the ejector 92 at a high pressure is circulated to the bleed off washing water tank 90, the internal pressure of the bleed off washing water tank 90 may excessively increase. The gas discharge port 90a discharges the gas inside the bleed-off cleansing water tank 90, so that the overpressure of the bleed-off cleansing water tank 90 can be prevented.

Hereinafter, with reference to FIGS. 3 and 4, the operation of the polluted water treatment system 1 will be described in more detail.

3 and 4 are operation diagrams for explaining the operation of the polluted water treatment system.

The contaminated water treatment system 1 according to the present invention generates fresh water by evaporating and condensing the wash water containing the sulfate or nitrate generated by the purification of the exhaust gas in the generator module 70, The amount of water can be reduced. Therefore, it is possible to reduce the volume of the tank for storing the cleansing water containing the salt, and if necessary, the separate tank for storing the cleansing water containing the salt can be omitted, so that the cost for installing and maintaining the tank And the space utilization in the ship can be increased. In addition, it is possible to reduce the energy consumed when the washing water containing the salt is forcibly cooled to precipitate the sulfate or nitrate, and it can be realized by adding only the piping to the scrubber 30 and the water generator module 70 , Which is easy to apply to a conventional system.

Referring to FIG. 3, the evaporator 71 of the water generator module 70 can evaporate the washing water using steam supplied from the boiler 200.

The exhaust gas discharged from the combustion engine 100 and flowing through the exhaust gas pipe 10 is oxidized and supplied to the scrubber 30. The rinse water that flows into the seawater inlet s or is stored in the fresh water storage tank 75, Is supplied to the scrubber (30) through the supply pipe (20). The scrubber 30 removes nitrogen oxides, sulfur oxides, fine dusts, and the like contained in the exhaust gas by bringing the exhaust gas and the washing water into gas-liquid contact, and the exhaust gas from which nitrogen oxides, sulfur oxides, 36, and then exhausted through the exhaust pipe 30a. The cleansing water containing contaminants such as nitrogen oxides, sulfur oxides, fine dusts and the like flows in contact with the exhaust gas through the cleansing water discharge pipe 40 and is stored in the cleansing water storage tank 50. The washing water stored in the washing water storage tank 50 can be neutralized to an appropriate pH by the neutralizing agent supplied from the neutralizing agent supplying unit 60. The neutralizing agent reacts with nitrogen oxides and sulfur oxides to produce sulfate (Na ₂ SO ₄ ) and nitrate (NaNO ₃ ), and the resulting salt is contained in the washing water in a solid or liquid state. A part of the washing water containing the salt is circulated to the scrubber 30 through the washing water circulating pipe 51 and the remaining part is moved to the filtration unit 80 through the washing water discharge pipe 40. The filtration unit 80 separates the solid particles contained in the washing water, and the solid particles separated from the washing water are stored in the sludge tank 81.

The cleansing water from which the solid phase particles have been separated moves to the bleed-off cleansing water tank 90 and a part thereof is supplied to the evaporating portion 71 of the water purifier module 70 through the washing water discharge pipe 40, And then branched to the pipe 91. The washing water which has been transferred to the evaporator 71 is evaporated by heat exchange with the steam supplied from the boiler 200. The evaporated washing water in the gaseous state is transferred to the condenser 72 and is condensed through heat exchange with seawater, . At this time, the porous net 73 interposed between the evaporator 71 and the condenser 72 prevents the solid particles including the salt precipitated in the water vapor from moving to the condenser 72 as the washing water evaporates can do. The cleansing water branched to the circulation pipe 91 passes through the ejector 92 and keeps the inside of the water purifier module 70 at a negative pressure so that the inside of the evaporator 71 is in a vacuum state, It can evaporate. The cleansing water that has passed through the ejector 92 is circulated to the bleed-off cleansing water tank 90 together with the unevaporated cleansing water and the precipitated salt in the evaporating portion 71 which is sucked into the suction pipe 93. At this time, the gas inside the bleed-off cleansing water tank 90 can be discharged by opening the gas discharge port 90a so that the inside of the bleed-off cleansing water tank 90 is not overpressed by the cleansing water circulated at a high pressure. A part of the washing water containing the salt circulated to the bleed-off washing water tank 90 is supplied to the evaporator 71 through the washing water discharge pipe 40 and the remaining part of the wash water is supplied to the nitrate storage tank Lt; RTI ID = 0.0 &gt; 94 &lt; / RTI &

The fresh water generated in the condenser 72 is discharged through the fresh water discharge pipe 74 and stored in the fresh water storage tank 75 and circulated through the fresh water circulation pipe 76 to the clean water supply pipe 20 or the boiler 200 .

Referring to FIG. 4, the evaporator 71 of the water generator module 70 can evaporate the washing water by using the steam supplied from the scrubber 30.

The exhaust gas discharged from the combustion engine 100 and flowing through the exhaust gas pipe 10 is oxidized and supplied to the scrubber 30 and the washing water is supplied to the scrubber 30 through the washing water supply pipe 20. The scrubber 30 removes nitrogen oxides, sulfur oxides, fine dusts, and the like contained in the exhaust gas by gas-liquid contact between the exhaust gas and the washing water. The exhaust gas from which the nitrogen oxide, the sulfur oxide, and the fine dust are removed is discharged through the exhaust pipe 30a . The cleansing water is discharged to the cleansing water storage tank 50 through the cleansing water discharge pipe 40 and the neutralizing agent supply unit 60 supplies the cleansing water into the cleansing water storage tank 50 to neutralize the acidified cleansing water. The neutralizing agent reacts with nitrogen oxides and sulfur oxides to form sulfate (Na ₂ SO ₄ ) and nitrate (NaNO ₃ ), and the resulting salt is contained in the washing water in a solid or liquid state. Part of the washing water containing the salt is circulated to the scrubber 30, and the remaining part thereof is transferred to the filtration unit 80.

The washing water moved to the filtration unit 80 moves to the bleed off washing water tank 90 after the solid particles are separated and a part of the washing water stored in the bleed off washing water tank 90 flows into the washing water discharge pipe 40, To the evaporator 71 of the generator module 70, and the remaining part of the refrigerant is diverted to the circulation pipe 91. The washing water which has moved to the evaporator 71 is heat-exchanged with the steam supplied from the scrubber 30 and evaporated. The evaporated gaseous wash water moves to the condenser 72 and is condensed through heat exchange with seawater, . When the steam generated in the scrubber 30 is supplied to the evaporator 71, the steam generated in the boiler 200 can be utilized in the ship. The cleansing water branched to the circulation pipe 91 passes through the ejector 92 and keeps the inside of the water purifier module 70 at a negative pressure so that the unevaporated washing water in the evaporator 71 sucked into the suction pipe 93 And the bleed-off rinse water tank 90 together with the precipitated salt.

4 is the same as that of FIG. 3 except that the evaporator 71 evaporates the steam supplied from the scrubber 30 by exchanging heat between the steam and the washing water.

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: Polluted water treatment system
10: Exhaust gas pipe 20: Cleaning water supply pipe
30: Scrubber 30a: Exhaust pipe
31: first contact portion 32: second contact portion
33: injection nozzle 34: stirring panel
35: mixer 36: droplet separator
37: exhaust fan 40: washing water discharge pipe
50: rinse water storage tank 51: rinse water purification tank
60: neutralizing agent supply unit 70: water generator module
71: evaporator 72: condenser
73: Porous netting 74: Fresh water discharge pipe
75: fresh water storage tank 76: fresh water circulation pipe
80: Filtration unit 81: Sludge tank
90: bleed off washing water tank 91: circulation tube
92: Ejector 92a:
92b: diffuser part 92c: suction part
93: Suction pipe 94: Nitrate storage tank
100: Combustion engine 200: Boiler

Claims (8)

An exhaust gas pipe for oxidizing and supplying an exhaust gas of a combustion engine mounted on an offshore structure;
A cleaning water supply pipe for supplying cleaning water;
A scrubber connected to the exhaust gas pipe and the cleaning water supply pipe, respectively, for gas-liquid contacting the oxidized exhaust gas and the cleaning water;
A rinse water discharge pipe for discharging the rinse water inside the scrubber;
A scrubbing water storage tank connected to the scrubbing water discharge pipe to store the scrubbing water discharged from the scrubber, and a cleansing water circulation pipe connected to one side to circulate a part of the scrubbing water to the scrubber;
A neutralizing agent supply unit for supplying a neutralizing agent into the washing water storage tank;
The washing water is supplied to the washing water discharge pipe at the rear end of the washing water storage tank, and the washing water containing the salt generated by the reaction between the washing water and the neutralizing agent is supplied into the washing water storage tank, A contaminated water treatment system comprising a water module. The water purifier of claim 1, wherein the water purifier module comprises: an evaporator for evaporating the washing water containing the salt by heat exchange with steam;
And a condensing portion for performing heat exchange with the seawater to condense the washing water evaporated in the evaporating portion to generate the fresh water. 3. The polluted water processing system according to claim 2, wherein the steam is produced by gas-liquid contact between the exhaust gas and the cleaning water in the scrubber or generated in the boiler. The washing machine according to claim 2, further comprising: a filtering unit connected to the washing water discharge pipe between the washing water storage tank and the water purifier module, for separating the solid particles contained in the washing water containing the salt;
And a bleed off washing water tank connected to the washing water discharge pipe at the downstream end of the filtration unit. The washing machine according to claim 4, further comprising: a cleaning water discharge pipe connected to the bleed-off rinse water tank, branched from the rinse water discharge pipe at the rear end of the bleed-off rinse water tank or connected to one side of the bleed- A circulation pipe for connecting the circulation pipe,
And an ejector installed on the circulation pipe,
The ejector
A nozzle portion for spraying the cleansing water containing the salt introduced into the circulation tube at a high speed, a diffuser portion for discharging the cleansing water including the salt that has passed through the nozzle portion, and a diffuser portion between the nozzle portion and the diffuser portion And a suction unit having one side connected to the evaporator,
Wherein when the washing water containing the salt is sprayed from the nozzle part to the diffuser part, a negative pressure is formed in the suction part to maintain the inside of the water purifier module at a negative pressure. The contaminated water treatment system according to claim 5, further comprising: a gas outlet formed at one side of the bleed off washer water tank for discharging gas inside the bleed off washer water tank. The contaminated water treatment system according to claim 2, further comprising a porous net disposed between the evaporator and the condenser to prevent the solid particles including the salt precipitated in the evaporator from moving to the condenser, . The contaminated water treatment system according to claim 2, further comprising a fresh water circulation pipe for supplying the fresh water generated by the condenser to the boiler or the scrubber or the wash water supply pipe.

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