WO2020242074A1

WO2020242074A1 - Wet-type dust collecting unit and wet-type dust collecting apparatus using same

Info

Publication number: WO2020242074A1
Application number: PCT/KR2020/005947
Authority: WO
Inventors: 이장열; 진해진; 전성훈
Original assignee: 지디엠에코 주식회사; 이장열; 진해진; 전성훈
Priority date: 2019-05-24
Filing date: 2020-05-06
Publication date: 2020-12-03
Also published as: CN114269453A; KR102072734B1

Abstract

A wet-type dust collecting unit according to an embodiment of the present invention comprises: an upper unit comprising at the top end thereof an inlet through which cleaning water and contaminated gas mixed with contaminants are simultaneously introduced, a mixed flow path extending downward from the inlet, and a plurality of blades provided in the mixed flow path to generate a vortex in the contaminated gas and the cleaning water, which have been introduced through the inlet; and a lower unit provided below the upper unit and having formed therein an accommodation bath for accommodating a mixed fluid that has dropped down from the upper unit.

Description

Wet dust collection unit and wet dust collection device using the same

The present invention relates to a wet type dust collection unit and a wet type dust collection device using the same, and more particularly, to a wet type dust collection unit that removes pollutants in a gas using washing water, and a wet type dust collection device using the same.

In factories that discharge fine dust, dust, or harmful gas, installation of a dust collector for purifying and discharging contaminated gas is compulsory.

Dust collectors are largely classified into dry dust collectors and wet dust collectors depending on the dust collection method, and dry dust collectors remove pollutants by means of filters and electric dust collectors, and wet dust collectors use washing water to precipitate pollutants. Contaminants are removed in a manner

An example of a wet dust collecting device includes a device using the collision method of water molecules such as Korean Patent Publication No. 2018-0034551 (2018.03.26).

The problem to be solved by the present invention is to provide a wet dust collecting unit with improved efficiency of removing pollutants and a wet dust collecting device using the same.

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

In the wet-type dust collecting unit according to an embodiment of the present invention for solving the above problem, an inlet through which pollutant gas mixed with pollutants and washing water are introduced together is formed at an upper end, and a mixing flow path extending downward from the inlet is formed, and the An upper unit including a plurality of blades provided in the mixing flow path to generate eddy currents in the polluted gas and the washing water introduced through the inlet; And a lower unit provided below the upper unit and having a receiving tank for receiving the mixed fluid dropped from the upper unit.

The mixing flow path may be formed such that the diameter decreases downward.

The plurality of blades may be inclined downward and extend.

The upper end of any blade among the plurality of blades is a part or lower end of the inclined surface of the adjacent blade so that the washing water falling vertically downward through the inlet is discharged from the upper unit after colliding with at least one of the plurality of blades. It may be formed to be located on the same vertical line as.

The plurality of blades may include N blades, and an angle between an upper end and a lower end of the N blades may be formed to be 360°/N or more.

The upper unit may further include a blade support shaft formed in the center of the mixing passage, and the plurality of blades may be formed to connect the blade support shaft and an inner surface of the mixing passage.

The upper end of the receiving tank includes an opening having a diameter wider than that of the lower end of the mixing flow path, and as the mixed fluid accommodated in the receiving tank exceeds the receiving capacity of the receiving tank, the mixed fluid accommodated in the receiving tank passes through the opening. It can be discharged to the outside of the receiving tank.

A wet dust collecting device according to an embodiment of the present invention for solving the above problems includes: a chamber; a gas inlet formed on one side of the chamber to introduce a contaminated gas mixed with a contaminant from the outside; and the gas inlet in the chamber. A washing water injection unit provided adjacent to the washing water injection unit; a plurality of wet dust collecting units provided below the washing water injection unit in the chamber; a purifying gas inlet opening downwardly under the plurality of wet dust collecting units in the chamber; A purification gas discharge pipe extending upward from the purification gas inlet to connect the purification gas discharge port exposed to the outside of the chamber, and the wet dust collecting unit includes an inlet through which pollutant gas mixed with pollutants and washing water are introduced together Is formed, the mixing flow path extending downward from the inlet, and the upper unit including a plurality of blades provided in the mixing flow path to generate a vortex in the polluted gas and the washing water introduced through the inlet and the upper And a lower unit provided at the lower portion of the unit and having a receiving tank for receiving the mixed fluid dropped from the upper unit.

The plurality of wet dust collecting units may be annularly disposed around the purification gas discharge pipe.

Further comprising a support plate provided to connect between the purification gas discharge pipe and the inner wall of the chamber at a lower portion of the gas inlet and the washing water injection unit to separate the space inside the chamber vertically, the plurality of wet dust collecting units The inlet is installed on the support plate so that the inlet is located on one surface of the support plate, so that the pollutant gas and the washing water introduced into the chamber can move to the lower portion of the support plate only through the plurality of wet dust collecting units.

Other specific details of the present invention are included in the detailed description and drawings.

According to the embodiments of the present invention, there are at least the following effects.

The efficiency of removing contaminants is improved.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a perspective view showing a wet dust collecting unit according to an embodiment of the present invention.

2 is an exploded perspective view showing a wet dust collecting unit according to an embodiment of the present invention.

3 is a side view showing a wet dust collecting unit according to an embodiment of the present invention.

4 is a plan view showing a wet dust collecting unit according to an embodiment of the present invention.

5 is a cross-sectional view taken along line AA of FIG. 4.

6 is a diagram schematically showing the configuration of a wet dust collector according to an embodiment of the present invention.

7 is a schematic cross-sectional view taken along line BB of FIG. 6.

8 is a schematic cross-sectional view taken along line CC of FIG. 6.

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

Further, the embodiments described in the present specification will be described with reference to sectional views and/or schematic diagrams, which are ideal exemplary diagrams of the present invention. Therefore, the shape of the exemplary diagram may be modified by manufacturing technology and/or tolerance. In addition, in each of the drawings shown in the present invention, each component may be somewhat enlarged or reduced in consideration of convenience of description. The same reference numerals refer to the same components throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for explaining a wet type dust collection unit and a wet type dust collection apparatus using the same according to an embodiment of the present invention.

1 is a perspective view showing a wet dust collecting unit according to an embodiment of the present invention, Figure 2 is an exploded perspective view showing a wet dust collecting unit according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention It is a side view showing a wet dust collecting unit according to, Figure 4 is a plan view showing the wet dust collecting unit according to an embodiment of the present invention, Figure 5 is a cross-sectional view taken along line AA of FIG.

As shown in FIGS. 1 to 5, the wet dust collecting unit 10 according to an embodiment of the present invention includes an upper unit 110 and a lower unit 120.

The upper unit 110 includes a flange 112 having an inlet 111 formed therein, a mixing flow path 117 extending downward from the flange 112, and a plurality of blades 114 provided in the mixing flow path 117.

The flange 112 may be configured as a substantially circular plate in which the inlet 111 is formed in the center, but is not limited thereto, and may be configured as a polygonal plate such as a square.

The mixing flow path 117 extends downward from the flange 112 and may include a shaft pipe flow path 115 and a straight pipe flow path 116.

As shown in FIG. 3, the shaft pipe flow path 115 is formed to extend downward from the flange 112, and is formed to gradually decrease in diameter as it goes downward. The straight pipe flow path 116 is formed extending downward from the shaft pipe flow path 115 toward the lower unit 120.

The plurality of blades 114 are provided in the shaft pipe flow path 115.

As shown in FIG. 1 and the like, the upper end of the blade 114 may be formed to be positioned on the same plane as the flange 112, but according to the embodiment, the upper end of the blade 114 is positioned lower than the flange 112 Alternatively, the outside of the inlet 111 may also be formed to protrude.

As shown in FIG. 1 and the like, the upper unit 110 may include a blade support shaft 113 formed in the center of the shaft pipe flow path 115, and a plurality of blades 114 include a blade support shaft 113 and a shaft pipe. It may be formed to connect the inner surface of the flow path 115. Each blade 114 may be formed to extend downwardly inclined along the inner surface of the shaft pipe passage 115.

Although not shown, according to the embodiment, a plurality of blades 114 are formed to extend from the blade support shaft 113 toward the inner surface of the shaft pipe flow path 115, but are formed so as not to come into contact with the shaft pipe flow path 115, or The support shaft 113 may not be formed and a plurality of blades 114 may be formed extending from the inner surface of the shaft pipe passage 115 toward the center of the shaft pipe passage 115.

As shown in FIG. 4, the plurality of blades 114 are formed so that the lower end of the shaft pipe flow path 115 is completely covered by the plurality of blades 114 when viewed from the top of the upper unit 110.

That is, the upper end of each blade 114 is located on the same vertical line as the lower end of the adjacent blade 114, or is located on the same vertical line with some of the inclined surfaces of the neighboring blades 114.

In the embodiment shown in Figs. 4 and 5, the upper unit 110 in which four

blades

114a, 114b, 114c, and 114d are formed is shown, and the lower end 132 of one of these blades 114d is It is positioned on the same vertical line so as to overlap the upper end 133 of the adjacent blade 114a. That is, the angle θ between the

upper ends

131 and 133 and the

lower ends

132 and 134 of the

blades

114a and 114d is formed to be approximately 90°.

When the horizontal angle θ between the upper end (131, 133) and the lower end (132, 134) of the blade (114a, 114d) exceeds 90 ° is formed, the lower end (132) of the blade (114d) is a neighboring blade ( It may be located on the same vertical line as some of the slopes of 114a).

In the present embodiment, an example in which the plurality of blades 114 is composed of four

blades

114a, 114b, 114c, and 114d is illustrated, but when the plurality of blades 114 is composed of three blades, the upper end of each blade and When the horizontal angle θ formed by the lower end is configured to be 120° or more, the lower end of the shaft pipe flow path 115 is completely covered by the plurality of blades 114.

In general, if it is composed of N blades 114, if the horizontal angle θ formed between the upper and lower ends of each blade 114 is formed to be 360°/N or more, the lower end of the shaft pipe flow path 115 It is completely covered by the blade 114 of.

As described above, when the lower end of the shaft pipe passage 115 is completely covered by the plurality of blades 114, when the washing water introduced through the inlet 111 falls vertically downward by gravity, the washing water is It cannot pass through the shaft pipe flow path 115 without colliding with (114). Accordingly, almost all of the washing water introduced into the shaft pipe passage 115 through the inlet 111 collides with the blade 114 and flows along the inclined surface of the blade 114 to form a vortex. In this process, the washing water mixes more effectively with the pollutant gas and absorbs pollutants present in the pollutant gas.

The straight pipe flow path 116 extends vertically downward from the lower end of the shaft pipe flow path 115, passes through the shaft pipe flow path 115, and guides the mixed fluid in which the pollutant gas and washing water are mixed to the receiving tank of the lower unit 120.

The straight pipe flow path 116 once again changes the flow of the mixed fluid in which the vortex is formed by the blade 114 in the shaft pipe flow path 115, and the mixed fluid passes through the straight pipe flow path 116 and is once again cleaned with polluted gas. Let the water mix.

As shown in FIG. 2, a plurality of upper ribs 118 are formed on the outer surface of the shaft pipe flow path 115 to improve structural stability of the upper unit 110. Each upper rib 118 may be formed with a first insertion hole 119 into which a coupling member such as a screw is inserted.

The plurality of upper ribs 118 may be formed such that a plurality of a pair of upper ribs formed adjacent to each other are provided.

Meanwhile, the lower unit 120 includes a cup-shaped accommodation tank 121 and a plurality of lower ribs 122.

As shown in FIG. 5, the receiving tank 121 forms a receiving space 124 therein, and as shown in FIG. 2, the upper end of the receiving tank 121 is formed to be opened.

The opening formed at the upper end of the receiving tank 121 is formed to be wider than the lower end diameter of the straight pipe passage 116 so that a gap is formed between the upper end of the receiving tub 121 and the lower end of the straight pipe passage 116.

The lower rib 122 is formed extending upward from the receiving tank 121 and coupled to the upper rib 118. In the present embodiment, an example in which the lower rib 122 protrudes from the inner wall of the receiving tank 121 is illustrated, but the present invention is not limited thereto, and according to the embodiment, the hip rib 122 is the outer wall of the receiving tank 121 It may be formed extending from.

As shown in FIG. 1, the lower rib 122 may be coupled to the upper rib 118 in a manner that is inserted between a pair of upper ribs 118. As shown in FIG. 2, a second insertion hole 123 may be formed in the lower rib 122. In a state in which the upper rib 118 and the lower rib 122 are engaged with each other, the second insertion hole 123 overlaps the first insertion hole 119, and the coupling member is inserted into the first insertion hole 119 and the second. It is installed to penetrate the hole 123 at the same time so that the upper unit 110 and the lower unit 120 are coupled.

Hereinafter, a dust collection process of the wet dust collection unit 10 according to the present embodiment according to the above-described configuration will be described.

As shown in FIG. 1, the polluted gas/washed water A1 falling from the upper portion of the upper rib 118 flows into the shaft pipe passage 115 through the inlet 111. The polluted gas/washed water A1 introduced through the inlet 111 flows along one surface of the plurality of blades 114 and forms a vortex in the shaft pipe passage 115 to induce mixing between the polluted gas and the washing water. During this process, pollutants contained in the pollutant gas are dissolved in the washing water or absorbed and become heavy.

Thereafter, the polluted gas/washed water A1 passes through the straight pipe flow path 116 and falls into the receiving tank 121 of the lower unit 120. The mixed fluid falling into the receiving tank 121 is mixed once again in the receiving tank 121, and in this process, the pollutants contained in the contaminated gas remain in the receiving tank 121 together with the washing water.

The receiving tank 121 is filled with the mixed material dropped from the upper unit 110, and after that, the washing water A2 containing the contaminant overflows through the opening of the receiving tank 121. Since the top diameter of the receiving tank 121 is larger than the bottom diameter of the straight pipe flow path 116, the washing water A2 containing contaminants is passed through the gap between the straight pipe flow path 116 and the receiving tank 121 (121) It overflows to the outside.

Even in a state in which the washing water A2 containing contaminants overflows to the outside of the receiving tank 121, the polluted gas/washing water A1 passes through the straight pipe 116 and continuously falls toward the receiving tank 121. However, the pollutant gas/wash water (A1) that has fallen from the straight pipe flow path 116 collides with the washing water (A2) containing pollutants that has risen to the top of the receiving tank 121, and is included in the pollutant gas in this process. The polluted material is moved to the washing water (A2) side, and the gas discharged between the upper unit 110 and the lower unit 120 is significantly reduced in content of the pollutant compared to the gas introduced through the inlet 111.

In the wet dust collecting unit 10 according to the present embodiment, when the washing water flowing through the inlet 111 falls vertically downward by gravity, the washing water passes through the shaft pipe flow path 115 without colliding with the blade 114 Since it is configured so that it is not possible, the washing water forms a vortex in the process of passing through the shaft pipe flow path 115, and in this process, the pollutants in the gas are primarily moved to the washing water side, and the washing water is the shaft pipe flow path 115 In the straight pipe flow path 116, the flow of the fluid is changed once again, so that the pollutants in the gas are secondarily moved to the washing water in this process. Thereafter, the washing water that has fallen from the straight pipe passage 116 toward the receiving tank 121 collides with the washing water that has been accommodated in the receiving tank 121 or has risen to the upper end of the receiving tank 121, and thirdly pollutants in the gas are It moves to the washing water side.

Accordingly, the pollutant gas passing through the wet dust collecting unit 10 according to the present embodiment undergoes approximately three dust collection processes, so that pollutants can be more effectively removed.

Hereinafter, a wet dust collecting device according to an embodiment of the present invention will be described. The wet dust collecting device according to an embodiment of the present invention uses the wet dust collecting unit 10 described above, and a detailed description of the wet dust collecting unit 10 is omitted for convenience of description.

6 is a diagram schematically showing a configuration of a wet dust collecting device according to an embodiment of the present invention, FIG. 7 is a schematic cross-sectional view taken along line BB of FIG. 6, and FIG. 8 is a schematic cross-sectional view taken along line CC of FIG. 6 to be.

As shown in Figure 6, the wet type dust collecting apparatus 1 according to an embodiment of the present invention includes a chamber 20, a washing water injection unit 40, a

support plate

51, 52, a plurality of wet dust collecting units ( 10) and a purification gas discharge pipe (60).

A gas inlet 30 through which pollutant gas mixed with pollutants is introduced is formed at one side of the upper end of the chamber 20.

A washing water injection part 40 is provided on the upper side of the interior of the chamber 20. The washing water injection unit 40 is a configuration for injecting washing water into the chamber 20, and as shown in FIG. 6, the washing water inlet 41, the annular washing water distribution passage 42, and the washing water It includes a spray nozzle (43).

The washing water inlet 41 may be connected to a circulation passage 71 that pumps and filters washing water remaining at the lower end of the chamber 20 and supplies the washing water to the washing water inlet 41. Alternatively, the washing water inlet 41 may be connected to a separate washing liquid storage tank (not shown).

The washing water flowing into the washing water inlet 41 may include purified water, a neutralizing solution for neutralizing acidic or basic substances, and the like.

As shown in FIG. 7, the washing water distribution passage 42 may be formed in an annular shape along the outer side of the purification gas discharge pipe 60 extending upward from the inside of the chamber 20, and the washing water spray nozzle 43 ) Is formed at regular intervals along the washing water distribution passage 42 and sprays the washing water flowing along the washing water distribution passage 42 downward.

A first support plate 51 is installed under the washing water spraying part 40.

As shown in FIG. 8, the first support plate 51 connects between the purification gas discharge pipe 60 and the inner wall of the chamber 20, and at the same time, the first support plate 51 provides a space in the chamber 20. It is formed so that it can be divided up and down.

As shown in FIG. 8, the first support plate 51 supports the plurality of wet dust collection units 10 so that the plurality of wet dust collection units 10 are arranged in an annular shape around the purification gas discharge pipe 60. As shown in FIG. 6, the plurality of wet dust collecting units 10 may be installed such that the inlet 111 is located on one surface of the first support plate 51.

Therefore, the polluted gas introduced through the gas inlet 30 and the washing water sprayed from the washing water injection unit 40 are removed without passing through the wet dust collecting unit 10 supported on the first support plate 51. 1 It cannot be moved to the lower part of the support plate 51.

As shown in FIG. 6, a second support plate 52 may be installed under the first support plate 51. The second support plate 52 is also formed to connect between the purification gas discharge pipe 60 and the inner wall of the chamber 20 and at the same time separate the space in the chamber 20 up and down. In addition, similar to the first support plate 51, a plurality of wet dust collection units 10 are supported so that the plurality of wet dust collection units 10 are arranged in an annular shape around the purifying gas discharge pipe 60.

Therefore, after passing through the plurality of wet dust collecting units 10 supported by the first support plate 51, the pollutant gas and washing water that have fallen toward the second support plate 52 are supported by the second support plate 52. It cannot be moved to the lower portion of the second support plate 52 without passing through the wet dust collecting unit 10.

In this embodiment, a wet dust collecting device 1 including a first support plate 51 and a second support plate 52 is illustrated and described as an example, but the present invention is not limited thereto, and the second The support plate 52 may be omitted, or a third support plate may be added.

The purge gas discharge pipe 60 is formed below the second support plate 52 and a plurality of wet dust collecting units 10 supported by the second support plate 52, and has a purge gas inlet 61 opened downward. It includes, and is formed extending upward from the purification gas inlet 61 so as to connect the purification gas outlet 62 and the purification gas inlet 61 exposed to the outside of the chamber 20 to penetrate the upper side of the chamber 20. In the interior of the purge gas discharge pipe 60, a purge gas discharge passage 63 connecting the purge gas inlet 61 and the purge gas discharge port 62 is formed.

According to the above-described configuration, the contaminated gas introduced through the gas inlet 30 is mixed with the washing water sprayed from the washing water spraying unit 40 and applied to the first support plate 51 and the first support plate 51. It falls toward the supported wet type dust collecting unit 10.

Thereafter, the dropped pollutant gas and washing water pass through the wet dust collecting unit 10 supported on the first support plate 51 to purify the pollutant gas.

Thereafter, the washing water dropped downward from the receiving tank 121 of the wet dust collecting unit 10 supported by the first support plate 51 and the wet dust collecting unit 10 supported by the first support plate 51 pass through. The purified gas falls toward the second support plate 52 and the wet dust collecting unit 10 supported on the second support plate 52.

Thereafter, the dropped gas and washing water pass through the wet dust collecting unit 10 supported by the second support plate 52 to purify the gas.

Thereafter, the washing water that has fallen downward from the receiving tank 121 of the wet dust collecting unit 10 supported by the second support plate 52 falls to the bottom of the chamber 20, and then falls on the second support plate 52. After passing through the supported wet dust collecting unit 10, the purified gas flows into the purifying gas discharge pipe 60 through the purifying gas inlet 61, and then rises through the purifying gas discharge flow path 64 and rises through the purifying gas discharge port 62. ) Through.

The washing water that has fallen to the bottom of the chamber 20 passes through the wet dust collecting unit 10 supported by the first support plate 51 and the second support plate 52, and passes through the drain 80 along with the captured contaminants. It is discharged to the outside of the chamber 20 through the pump 72, or is introduced into the circulation passage 71 by the pump 72 and supplied to the washing water inlet 41 through the filter.

Those of ordinary skill in the art to which the present invention pertains will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

Claims

An inlet through which pollutant gas mixed with pollutants and washing water are introduced together is formed at the top, a mixing channel extending downward from the inlet, and the pollutant gas and the washing water provided in the mixing channel and introduced through the inlet An upper unit including a plurality of blades for generating eddy currents; And

A wet dust collecting unit including; a lower unit provided below the upper unit and having a receiving tank for receiving the mixed fluid dropped from the upper unit.
The method of claim 1,

The mixing flow path is formed so as to decrease in diameter as it goes downward.
The method of claim 1,

The plurality of blades form an inclined downwardly and extends, a wet dust collecting unit.
The method of claim 3,

The upper end of any blade among the plurality of blades is a part or lower end of the inclined surface of the adjacent blade so that the washing water falling vertically downward through the inlet is discharged from the upper unit after colliding with at least one of the plurality of blades. Formed so as to be located on the same vertical line as, wet dust collecting unit.
The method of claim 4,

The plurality of blades includes N blades,

An angle between the upper and lower ends of the N blades is formed to be 360°/N or more.
The method of claim 1,

The upper unit further includes a blade support shaft formed in the center of the mixing flow path,

The plurality of blades is formed to connect the blade support shaft and the inner surface of the mixing flow path, wet dust collecting unit.
The method of claim 1,

The upper end of the receiving tank includes an opening having a diameter wider than that of the lower end of the mixing flow path, and as the mixed fluid accommodated in the receiving tank exceeds the receiving capacity of the receiving tank, the mixed fluid accommodated in the receiving tank passes through the opening. A wet dust collection unit that is discharged to the outside of the receiving tank.
chamber;

A gas inlet formed on one side of the chamber and through which pollutant gas mixed with pollutants is introduced from the outside;

A washing water injection unit provided in the chamber adjacent to the gas inlet;

A plurality of wet dust collecting units provided under the washing water spraying part in the chamber;

A purge gas discharge pipe extending upward from the purge gas inlet to connect a purge gas inlet opened downward under the plurality of wet dust collecting units in the chamber and a purge gas outlet exposed to the outside of the chamber,

The wet dust collection unit,

An inlet through which pollutant gas mixed with pollutants and washing water are introduced together is formed at the top, a mixing channel extending downward from the inlet port, and the pollutant gas and the washing water provided in the mixing channel and introduced through the inlet An upper unit comprising a plurality of blades for generating eddy current in the

And a lower unit provided below the upper unit and having a receiving tank for receiving the mixed fluid dropped from the upper unit.
The method of claim 8,

The plurality of wet dust collecting units are annularly disposed around the purification gas discharge pipe.
The method of claim 9,

Further comprising a support plate provided to connect between the purification gas discharge pipe and the inner wall of the chamber at a lower portion of the gas inlet and the washing water injection unit to separate the space inside the chamber vertically,

The plurality of wet dust collecting units are installed on the support plate so that the inlet is located on one surface of the support plate,

The pollutant gas and the washing water introduced into the chamber are moved to the lower portion of the support plate only through the plurality of wet dust collecting units.