KR101941199B1 - Exhaust Gas Quenching System - Google Patents

Abstract

The present invention relates to a wet scrubber for a ship and an exhaust gas quenching system having the same that are capable of effectively quenching exhaust gas absorbed before sulfur compounds are absorbed to an interior of a housing, thereby enhancing an absorption efficiency of the sulfur compounds. According to the present invention, the wet scrubber for a ship includes: a housing having an inlet formed on top thereof to absorb exhaust gas and an outlet formed on the bottom thereof to discharge the exhaust gas from which pollutants are absorbed; a cleaning water introduction prevention part disposed on top of the outlet to prevent cleaning water from being introduced in the inlet; an upward nozzle assembly disposed under the cleaning water introduction prevention part to inject the cleaning water in the same direction as the flow of exhaust gas; vanes disposed on the undersides of the cleaning water introduction prevention part to produce a rotating force of the exhaust gas; filler parts disposed above the cleaning water introduction prevention part and having fillers adapted to absorb sulfur compounds contained in the exhaust gas; downward nozzle assemblies disposed in spaces above the filler parts to inject the cleaning water in the opposite direction to the flow of exhaust gas; and a drain hole formed on one side of the lower end periphery of the housing to discharge the cleaning water collected in the bottom surface of the housing.

Description

[0001] Exhaust Gas Quenching System [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet scrubber for a ship for removing SOx from a marine flue gas and a cooling system for the flue gas including the same, and more particularly, The present invention relates to a wet scrubber for marine vessels capable of enhancing the efficiency of absorbing sulfur compounds by effectively quenching them and a flue gas cooling system including the same.

In recent years, problems such as environmental pollution caused by exhaust gas discharged from a ship have been caused, and attention has been focused on an apparatus or a method for treating the same.

The toxic substances contained in the flue gas discharged from ships are not only harmful to the human body but also cause environmental pollution if they are discharged into the air without filtration treatment. Especially, the sulfur compounds contained in the flue gas must be removed do.

On the other hand, the International Maritime Organization (IMO) limits the fuel sulfur content of ships by MARPOL (Marine Pollution Treaty), and since 2015, all emission control areas (ECAs) It is regulated to use less than 0.1% sulfur-containing fuel in the sea area.

In addition, for vessels using sulfur-containing fuels exceeding 0.1% due to problems such as fuel cost, the installation of SOx abatement devices is legally obligatory from 2015. That is, a desulfurization process is required to lower the content of SOx contained in the flue gas to a permissible concentration or less, and it is obligatory to release only the gas having undergone such a process to the atmosphere.

Accordingly, various types of flue gas treating apparatus for desulfurizing the ship flue gas and discharging it to the atmosphere are installed in the flue gas line of the ship.

A wet scrubber system for marine vessels is being used to treat such flue gas.

The wet scrubber system for marine vessels is a device for spraying cleaning water into a flue gas containing a pollutant and then dissolving or collecting contaminants of the flue gas by contacting the pollutants such as droplets, .

The wet scrubber system for marine includes an absorber for absorbing contaminants of flue gas by spraying washing water, a washing water treatment system for treating washing water discharged after absorbing contaminants, And a control system that monitors and controls the functions.

Among the above structures, the absorption tower is a core device of the wet scrubber system. In particular, in order to increase the contact area between the washing water and the flue gas, a packing such as a pall ring is installed inside the absorption tower A method has been used in which contaminants of the flue gas are dissolved in the washing water injected into the filler, or the washing water is directly sprayed into the flue gas to remove contaminants of the flue gas.

KR 10-1804418 B1

In order to solve the above problems, the present invention has been made in order to increase the absorption efficiency of sulfur compounds. In order to effectively cool the flue gas passing through the inside of the housing constituting the wet scrubber system, will be. Accordingly, the temperature of the flue gas at a high temperature is effectively lowered, and the aim is to increase the absorption and removal efficiency of sulfur compounds contained in the flue gas.

In order to accomplish the above object, the present invention provides an exhaust gas purifying apparatus, comprising: a lower portion provided with a suction port through which a flue gas is sucked; an exhaust port through which a pollutant contained in the flue gas is absorbed, A housing provided at an upper portion thereof; A washing water inflow preventing part installed on the upper side of the suction port to prevent the washing water from flowing into the suction port; A filler portion provided on the clean water inflow preventing portion and having a filler for absorbing sulfur compounds contained in the flue gas; At least one nozzle assembly installed at an upper portion of the filler portion and spraying washing water to the flue gas; And a drain hole provided at one side of the lower end of the housing for draining the washing water collected on the bottom surface of the housing.

Here, the housing means a cylindrical portion surrounding all mechanical devices, and a scrubber can be understood to denote an entire device composed of the above components.

The washing water inflow preventing portion may be formed in a conical shape inclined downward toward the inlet port to prevent the washing water from flowing into the inlet port.

A nozzle assembly for cooling the flue gas is attached to an upper portion below the washing water inflow preventing portion so that the washing water can be sprayed in the same direction as the flow of the flue gas, that is, upward.

The nozzle assembly includes a washing water supply line for supplying washing water to the inside of the housing through one side of the housing; And a spray nozzle installed in the wash water supply line so as to be adjustable in angle and spraying wash water to the flue gas.

The nozzle assembly has a structure capable of increasing the distance and time that the flushing gas can come into contact with the flue gas by spraying the flushing water in the direction in which the flue gas flows from the inlet port to the discharge port, that is, in the same direction as the flow of the flue gas.

The cleansing water inflow preventing portion may be a plurality of vanes provided along the horizontal bending portion of the cleansing water inflow preventing portion, which is installed at the lower end of the horizontal bending portion and generates rotational force in the flue gas sucked in. The vane may be curved or curved at a predetermined angle.

The filler part may include a pedestal filled with a packing having a passage through which flue gas and washing water can flow up and down, and a pedestal receiving the filling material.

The filler may be made of a material having high heat resistance and corrosion resistance so as not to be damaged by a high temperature flue gas containing contaminants.

In order to absorb SOx in the flue gas, the cleansing water injected from the pollutant removing nozzle assembly installed in the upper space of the filler contacts SOx contained in the flue gas by contacting the flue gas rising through the filler inside the filler , Passes through the filling material, and flows down to the space below the filling material. At this time, the flue gas rising toward the filler material is contacted, and the already cooled flue gas is further cooled.

A gas-liquid separator may be installed at the top of the housing between the discharge port and the nozzle assembly installed in the upper space of the filling material.

The marine wet scrubber may further include a control device for controlling the suction, discharge or flushing function of the flue gas or the cleaning water jetting function of the nozzle assembly.

Meanwhile, the present invention can include a marine wet scrubber system including the marine wet scrubber.

In the wet scrubber for a ship according to the present invention, the washing water is sprayed in the same direction as the flow of the flue gas in the upper nozzle assembly installed below the washing water inflow preventing portion, thereby increasing the contact distance and the contact time between the washing water and the flue gas. As a result, the temperature of the flue gas is effectively lowered unlike the conventional method of spraying the flushing water in a direction opposite to the flow of the flue gas. By lowering the temperature of the flue gas, the solubility of the washing water in the sulfur compound in the flue gas is increased, and the sulfur compounds in the flue gas can be effectively removed based on the solubility of the washing water.

Specifically, the present invention firstly cools the flue gas flowing toward the upper discharge port through the lower suction port of the housing by using the washing water flowing down through the hole formed in the horizontal bent portion at the lower end of the washing water inflow preventing portion. However, most of the flue gas flows to the upper part through the gap between the inlet end portion and the inside of the housing, and the contact time is very short, so that the cooling effect is not great. And the cleaning water is sprayed in the same direction as the flue gas and the flow through the nozzle assembly installed in the upper portion below the rinse water inflow preventing portion to increase the contact distance and contact time between the flue gas and the rinse water, And is effectively cooled.

Part of the flushing water sprayed in the same direction as the flue gas flow strikes the lower end of the filler part, then falls again by gravity, and in this process, the flue gas is further cooled.

The washing water injected in a direction opposite to the flow of the flue gas from the nozzle assembly installed in the upper space of the filler part flows through the inside of the filler material and flows down to the space below the filler material, thereby further cooling the flue gas.

As described above, by efficiently performing the cooling action on the flue gas sucked from the inlet, the flue gas of high temperature can be cooled to the middle temperature level, thereby increasing the solubility of the sulfur compound in the washing water, It is possible to increase the absorption efficiency of sulfur compounds.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a wet scrubber for a ship according to an embodiment of the present invention; FIG.
FIG. 2 is a sectional view and a plan view of a nozzle assembly installed at an upper portion below the washing water inflow preventing portion and a vane installed at a lower end of the washing water inflow preventing portion according to an embodiment of the present invention. FIG.
3 is a detailed diagram showing a process in which flue gas sucked from the inlet is divergently cooled by various flow paths of the washing water according to one embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Therefore, the scope of the present invention is not limited to the following examples.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

2 is a cross-sectional view and a plan view of a nozzle assembly installed at an upper portion below the washing water inflow preventing portion according to an embodiment of the present invention. FIG. 3 is a cross- The washing water sprayed in the same direction as the flow of the flue gas from the washing water injection nozzle mounted on the upper part of the lower part of the washing water inflow preventing part according to the embodiment, the washing water running downwardly against the lower end of the filling material part, And a cleaning water sprayed from the nozzle assembly and flowing into the lower space through the filler.

Referring to FIG. 1, a wet scrubber 10 according to an embodiment of the present invention includes a housing 100 defining an inner space, a cleaning water inflow preventing unit (not shown) installed inside the housing 100, The nozzle assembly 120A for removing pollutants, the nozzle assembly 120B for cooling the flue gas, the torque generating unit 130, the filler unit 140, the gas-liquid separator 150, and the controller (not shown) As shown in FIG.

The housing 100 may be formed in a chamber structure having an inlet 101 through which the flue gas is sucked and an outlet 102 through which the pollutant in the flue gas is absorbed and discharged.

The inlet (101) may be provided at a lower portion of the housing (100).

The inlet port 101 communicates with the inside of the housing 100 to connect the inside of the housing 100 and serves as a passage for moving the flue gas into the housing 100.

The suction port 101 is formed to protrude from the inside of the housing 100 toward the cleansing water inflow preventing portion 110 so as to be spaced apart from one end of the suction port 101 and the bottom surface of the housing 100 it is possible to prevent the washing water 5 collected in the housing 100 from flowing into the suction port 101. [

The outlet (102) may be provided on the upper portion of the housing (100). The discharge port 102 is sucked through the suction port 101 and serves as a passage for discharging the flue gas absorbed and treated by the washing water inside the housing 100 to the outside.

The inlet (101) and the outlet (102) may be provided with valves for controlling the opening and closing of the passages.

Referring to FIGS. 1 and 2 together, the cleansing water inflow preventing portion 110 may be installed at the upper portion of the suction port 101. The cleansing water inflow preventing portion 110 may be formed to be inclined downward toward the suction port 101. In addition, the washing water inflow preventing portion 110 is formed to have a size capable of covering the inlet 101.

An upward nozzle assembly 120B for flue gas cooling, which is sprayed in the same direction as the flue gas flow, is attached to an upper portion below the rinse water inflow preventing portion.

The cleansing water inflow preventing portion is configured such that the cleansing water 5 sprayed in the same direction as the direction of the flue gas from the upward nozzle assembly 120B for cooling the flue gas provided below the cleansing water inflow preventing portion collides with the filler portion, The washing water 5 sprayed from the upper part of the filling material and passing through the filling material and the washing water flowing downward is prevented from flowing into the inlet 101.

Specifically, the washing water inflow preventing portion 110 may include a sloped surface 111 formed to be inclined downward, and a horizontal bent portion 112 connected to the bottom edge of the sloped surface 111 to be bent.

The horizontal bent portion 112 is a portion formed by horizontally extending the lower edge of the inclined surface 111. The holes 112a are pierced so that the washing water flows or the flue gas sucked up flows upward .

The cleansing water 5 flowing along the inclined surface 111 of the cleansing water inflow preventing portion 110 is gathered in the horizontal bent portion 112 and the collected cleansing water 5 is collected in the holes 112a To the bottom surface of the housing 100. The flowing wash water 5 is discharged to the outside through the drain port 103 provided at one side of the lower end of the housing 100.

The flue gas sucked through the suction port 101 and moving toward the discharge port 102 comes into contact with the washing water 5 flowing down through the hole while flowing upward through the hole 112a, Secondary cooling can be achieved. However, full-blown and efficient flue gas cooling is achieved by significantly increasing the contact distance and contact time between the flue gas and the flushing gas sprayed in the same direction as the flue gas through the nozzle assembly 120B installed on the upper portion of the lower portion of the flushing water inflow preventing portion Loses.

Some of the cleansing water sprayed in the same direction as the flue gas flow is brought into contact with the lower end of the filler part and then falls again by gravity to cool the flue gas.

By this various cooling function, the flue gas can effectively lower the temperature before passing through the filler portion. As the temperature of the flue gas is lowered, the solubility of the washing water with respect to the sulfur compounds contained in the flue gas is increased, and the absorption efficiency of the washing water in the upper space of the filler portion and the filler portion is increased. Thereby improving the absorption and removal efficiency of sulfur compounds in the wet scrubber system for ships including the wet scrubber 10 for ships.

The upward nozzle assembly 120B for cooling the flue gas is installed at a lower portion of the lower portion of the washing water inflow preventing portion 110 so that washing water is sprayed in the same direction as the flow of the exhaust gas, 122).

The cleaning water supply line 121 may have a structure in which one side of the cleaning water supply line 121 is installed inside the housing 100 and the other side of the cleaning water supply line 121 extends to the outside of the housing 100. The other extended side of the washing water supply line 121 is connected to the washing water supplying part 123 so that the washing water 5 is supplied into the inside of the housing 100.

Meanwhile, the cleaning water supply line 121 may have a structure in which one side is installed inside the housing 100 and the other side is extended to the outside of the housing 100. The other extended side of the washing water supply line 121 is connected to the washing water supplying part 123 so that the washing water 5 is supplied into the inside of the housing 100.
As shown in FIG. 1, the space between the upper portion of the rinse water inflow preventing portion and the lower end of the first filler portion is a space for cooling the flue gas sucked into the high temperature state to below the middle temperature through the injection of the washing water. The flue gas temperature of about 300 ° C can be effectively absorbed and removed by the washing water passing through the filler while passing through the upper filler portion only when the flue gas temperature of about 300 ° C is cooled to a middle temperature of about 60 ° C. (This phenomenon is based on Henry Law's chemical law of gas solubility.) Therefore, the scrubber's pollutant removal rate is also greatly influenced by the cooling efficiency of the flue gas. Under these circumstances, the present invention is an invention of an upward nozzle assembly which can efficiently cool the inhaled flue gas.
As shown in FIG. 2, the supply line of the upward nozzle assembly may be formed in a ring shape along the upper circumference of the cleansing water inflow preventing portion, and the upward nozzle assembly may spray the cleansing water in the radial direction inside the housing A plurality of nozzles were arranged at intervals along the upper circumference of the supply line formed in the ring shape.
That is, the supply line 121 is formed in a ring shape along the outer circumference of the upper side of the washing water inflow preventing portion 110, and a plurality of the spraying nozzles 122 are formed along the ring- The washing water can be sprayed to the flue gas passing between the outside of the washing water inflow preventing portion 110 and the inside of the housing 100. [ As compared with the general cooling system in which the washing water is sprayed downward from one or two spray nozzles by contacting the flue gas while rinsing the flushing water along the flow path of the flue gas as shown in Fig. 3 of the present invention , It is possible to raise the cooling efficiency of the flue gas to a considerable level. In addition, the washing water injected upward in the upward direction spray nozzle assembly collides with the lower end of the filler part located at the upper part, and drops downward again, thereby further cooling the flue gas.
By cooling the flue gas in multiple and effective ways, the flue gas is cooled to the middle temperature level and the flue gas below the middle temperature, which has passed through the upper filler portion, is efficiently absorbed by the freshly sprayed flush water from the top of the filler Can be removed.

In the upper space of the filler part, a nozzle assembly for removing pollutants, which is equipped with a plurality of spray nozzles 122, may be installed in one or more stages so as to spray the washing water 5 in a reverse direction to the flow of the flue gas.

Under such an installation structure, the sulfur compound contained in the flue gas traveling to the discharge port 102 can be absorbed and removed by contact with the washing water sprayed in the opposite direction.

1 and 2, the rotational force generating unit may be installed at a lower portion of the horizontal bent portion 112 of the cleansing water inflow preventing portion 110, may include a plurality of vanes 130, The vane 130 may be formed in a curved surface structure.

The rotational force generating unit 130 causes the flue gas introduced into the housing 100 to rise while rotating the flue gas from the lower portion of the housing 100. Due to the rotation and synergism of the flue gas, Can be mixed well with the flue gas, and the sulfur compounds can be effectively cooled by the washing water.

The filler part 140 is installed in an upper space of the washing water inflow preventing part and a downward nozzle assembly 120A for removing contaminants is installed in an upper space of the filling material part 140 so that washing water is sprayed in the reverse direction of the flue gas flow do.

The flue gas passes through the filler material and contacts the cleansing water flowing downward while enclosing the filler material, whereby the sulfur compound contained in the flue gas can be absorbed.

The gas-liquid separator 150 may be installed between the top of the downward nozzle assembly 120A for removing contaminants and the flue gas outlet 102. [ The gas-liquid separator 150 is a device for separating gas and liquid by inducing rotation in a linear gas flow and using centrifugal force.

Accordingly, the flue gas passes through the gas-liquid separator 160 and the moisture contained in the flue gas is removed, and the flue gas from which the moisture is removed is discharged to the outside of the housing 100 through the discharge port 102.

The control device (not shown) controls the opening and closing of the valve installed at the inlet or the outlet to control the suction and discharge of the flue gas, and controls the supply amount of the washing water supplied to the nozzle assembly and the operation of the spray nozzle have.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary terms. It should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the configurations shown in the drawings and the embodiments described herein are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, It should be understood that various equivalents and modifications are possible.

10: Wet scrubber for ships
100: Housing
110: washing water inflow preventing portion
120A: Downward nozzle assembly for removing contaminants
120B: Upstream nozzle assembly for flue gas cooling
130: Vane
140: filler part
150: gas-liquid separator

Claims (10)

A housing having a suction port through which a flue gas is sucked and a discharge port through which the pollutant contained in the flue gas is absorbed and then discharged;
A washing water inflow preventing part which is formed in a conical shape inclined downward toward the suction port and installed at an upper part of the suction port to prevent the washing water from flowing into the suction port;
A filler portion provided in a space above the cleansing water inflow preventing portion and having a filler for absorbing sulfur compounds contained in the flue gas;
An upward nozzle assembly (120B) installed at an upper portion below the rinse water inflow preventing portion and for injecting rinse water into the flue gas in a radial direction from the inlet port to the outlet port in the same direction as the flow of the flue gas;
A downward nozzle assembly 120A for removing contaminants, which is installed in the space above the filler part and injects the washing water into the flue gas in a direction from the discharge port opposite to the flow of the flue gas toward the suction port;
A drain port installed at one side of a lower end of the housing to drain the washing water collected on the bottom surface of the housing;
Wherein the flue gas cooling up nozzle assembly and the pollutant removal downward nozzle assembly comprise:
A washing water supply line for supplying washing water to the inside of the housing through one side of the housing;
And an injection nozzle installed in the washing water supply line so as to be adjustable in angle, for spraying washing water to the flue gas,
Wherein the supply line of the upward nozzle assembly for cooling the flue gas is formed in the shape of a ring along the upper circumference of the cleansing water inflow preventing portion and the upward nozzle assembly has a ring shape for spraying the cleansing water in a radial direction inside the housing, Wherein a plurality of nozzles are arranged at intervals along the upper circumference of the supply line formed in the shape of a line.
delete delete delete delete delete delete delete delete A flue gas cooling system, comprising a marine wet scrubber for cooling a flue gas, comprising a marine wet scrubber according to claim 1.

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