KR20200072794A - Wet scrubber - Google Patents

Abstract

A wet cleaning apparatus according to the present invention includes: a body, in which an inlet, through which discharge gas is introduced, and an outlet, through which the discharge gas is discharged, are disposed on opposite side surfaces, and in which a cleaning liquid is accommodated; a blower unit connected to the inlet or the outlet to cause flows of the discharge gas such that the discharge gas passes between the inlet and the outlet; a plurality of partition walls installed in the interior of the body to be spaced apart from each other to form an air passage, through which the discharge gas flows; and an air injection part installed in the interior of the body to inject compressed air to the cleaning liquid. The wet cleaning apparatus can induce a strong vortex phenomenon by the plurality of partition walls and the air injection part so that particle contaminants, water-soluble VOCs gas materials contained in the discharge gas can be effectively removed by the cleaning liquid.

Description

Wet cleaning device {WET SCRUBBER}

The present invention relates to a wet cleaning device, specifically, to a wet cleaning device capable of effectively removing contaminants contained in a gas discharged from a life-adhering emission source by inducing a vortex phenomenon.

Recently, as the public's interest in fine dust has increased, it is strongly required to identify health risks and strengthen management levels.

Gogii Restaurant, one of the city's major life-giving sources, discharges secondary organic aerosols (SOA), organic carbon (OC) and inorganic carbon (EC) into the atmosphere. In particular, it is a representative cause of hazardous air pollutants (HAPs).

In Seoul, it is estimated that about 500 tons of fine dust are produced in the process of grilling meat in about 10,000 grilled meat restaurants annually, which accounts for about 2.4% of the fine dust in the air in Seoul. However, at present, most establishments use only a hood or a blower to ventilate without a separate treatment facility.

In addition, fire accidents are mainly occurring in restaurants due to the accumulation of the remains of ducts. According to statistical analysis data of firefighting activities in 2016, out of 43,000 national fire accidents in 2016, restaurant fires accounted for 6.3% (2,777 cases). About 20% of restaurant fires were caused by the accumulation of duct remains.

In addition, in the cooking process, not only oil and particulate matter, but also volatile organic compounds (VOCs) are discharged. When cooking meat and fish, more than 44 types of VOCs, carbonyl compounds and PAHs are released at least 1,000 μg/m ³ . Therefore, it is necessary to manage VOCs discharged from small and medium-sized restaurants, such as restaurants, as well as medium and large-sized restaurants.

In this way, a living-adherent emission source such as a restaurant simultaneously emits particulate matter and VOCs. Since most of the life-sponsored emission sources are small-scale businesses owned by self-employed business owners, it is difficult to secure a space to install devices to reduce particulate matter and VOCs.

In addition, since the conventional particulate matter and VOCs abatement equipment and technology were developed mainly for industrial or large business sites, installation and operation costs are high to apply the previously developed abatement equipment and technology to small-scale life-adhesive VOCs emission business sites. there is a problem.

In particular, in order to prevent safety accidents such as fire and explosion when applying the technology of reducing VOCs, the temperature of the gas is lowered and the unburned pollutants (dust, remains, etc.) are pretreated. After doing so, it is required to treat it with each air pollution prevention facility.

Publication Patent Publication No. 10-2017-0083265 (2017.07.18.)

The present invention has been devised to solve the above-mentioned conventional problems, and the object of the present invention is to induce a strong vortex phenomenon by a plurality of partition walls and an air injection unit, and contaminants contained in the gas discharged from the life-adhesive emission source. It is to provide a wet cleaning device that can effectively remove.

The present invention for achieving the above object is disposed on both sides opposite to the inlet portion through which the exhaust gas is introduced and the discharge portion through which the exhaust gas is discharged, and a main body portion in which cleaning liquid is accommodated; A blower which is connected to the inlet or the outlet and induces a flow of exhaust gas so that the exhaust gas passes between the inlet and the outlet; A plurality of partition walls which are installed spaced apart from each other in the main body, and form an air passage through which exhaust gas flows; And it is installed inside the body portion, and provides a wet cleaning device comprising an air injection unit for injecting compressed air to the cleaning liquid.

Here, the plurality of partition walls is characterized in that one surface is installed to face the exhaust gas flowing from the inlet.

In addition, the plurality of partition walls is characterized in that at least one bent region is formed.

In addition, the plurality of partition walls is characterized by comprising the first to sixth partition walls.

In addition, the first partition wall is installed adjacent to the inlet, the lower end is formed to be bent toward the outlet, the second partition wall is installed adjacent to the first partition wall, and the upper end is bent toward the first partition wall It is characterized by being formed.

In addition, the third partition wall is installed adjacent to the second partition wall, characterized in that the surface formed vertically extending from the bent region facing the second partition wall.

In addition, the fourth partition wall is characterized in that it is installed to cover the space between the first partition wall and the second partition wall from the upper side.

In addition, the fifth partition wall is installed adjacent to the discharge portion, it characterized in that the surface formed vertically extending from the bent area facing the discharge portion.

In addition, the sixth partition wall is characterized in that the upper end is installed adjacent to the space between the first partition wall and the second partition wall, and the lower end is adjacent to the air injection unit.

In addition, it is characterized in that it is formed perpendicular to the upper surface of the outer surface of the air injection unit, further comprising a dispersion plate for dispersing the compressed air injected through the air injection unit.

In the wet cleaning apparatus according to the present invention, a strong vortex phenomenon is induced by a plurality of partition walls and an air injection unit, so that particulate pollutants and water-soluble VOCs gaseous substances contained in the exhaust gas can be effectively removed by the cleaning solution. Therefore, it is possible to prevent the clogging phenomenon caused by contaminants, and this has the advantage of convenient maintenance and low maintenance cost.

In addition, the wet cleaning apparatus according to the present invention can effectively block the flame that may be introduced together with the exhaust gas by a plurality of partition walls and a vortex solution.

1 is a perspective view of a wet cleaning apparatus according to the present invention.
2 is a cross-sectional view of a wet cleaning apparatus according to the present invention.
3 is a view of the fluid flow according to the flow rate of the cleaning liquid in the wet cleaning apparatus according to the present invention.
4 is a view showing the removal efficiency of particulate matter by particle size range in the wet cleaning apparatus according to the present invention.
5 is a view showing the removal efficiency of particulate matter according to the amount of exhaust gas in the wet cleaning apparatus according to the present invention.
6 is a view showing the removal efficiency of particulate matter according to the water level of the cleaning liquid in the wet cleaning apparatus according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible, even if they are displayed on different drawings. In addition, when it is determined that the subject matter of the present invention may be obscured, the detailed description thereof will be omitted. In addition, although the embodiments of the present invention will be described below, the technical spirit of the present invention is not limited to or limited thereto, and can be practiced by those skilled in the art.

1 is a perspective view of a wet cleaning device according to the present invention, Figure 2 is a cross-sectional view of a wet cleaning device according to the present invention, Figure 3 is a view of the fluid flow according to the flow rate of the cleaning liquid in the wet cleaning device according to the present invention , Figure 4 is a view showing the removal efficiency of particulate matter by particle size range in the wet cleaning apparatus according to the present invention, Figure 5 is the efficiency of removing particulate matter according to the amount of exhaust gas in the wet cleaning apparatus according to the present invention 6 is a view showing the removal efficiency of particulate matter according to the level of the cleaning liquid in the wet cleaning apparatus according to the present invention.

Hereinafter, a wet cleaning device 1 according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 and 2, the wet cleaning device 1 includes a body portion 100, a blowing portion (not shown), a plurality of partition walls 200, and an air injection portion 300.

The main body 100 may be disposed on both sides facing the inlet 110 through which the exhaust gas is introduced and the outlet 120 through which the exhaust gas is discharged. In addition, the main body 100 is accommodated in a cleaning liquid that absorbs contaminants contained in the exhaust gas.

The cleaning liquid is a liquid that contacts or dissolves or absorbs contaminants in the exhaust gas, and may be variously formed, including water and chemicals. For example, tap water containing silicone oil may be used as the washing liquid, and the washing liquid may more effectively remove particulate matter containing oil droplets.

On the other hand, the discharge unit 120 of the body portion 100 may be provided with a demister 121 (Demister) for minimizing the effect of the droplets in the exhaust gas on one side.

The blower is connected to the inlet 110 or outlet 120 side, and causes the flow of the exhaust gas so that the exhaust gas passes between the inlet 110 and the outlet 120. The blower may be provided with a damper (not shown) for adjusting the air volume of the exhaust gas.

The plurality of partition walls 200 are installed spaced apart from each other inside the main body 100 and are provided to form an air flow path through which exhaust gas flows. Here, the plurality of partition walls 200 may be installed so that one surface faces the exhaust gas flowing from the inlet 110.

That is, when the exhaust gas flows from the inlet 110 to the outlet 120 by the blower, the exhaust gas is one surface of each of the plurality of partition walls 200 installed between the inlet 110 and the outlet 120 It flows by changing the direction while colliding with it, thereby forming a vortex of the cleaning liquid accommodated in the main body 100 to extend the time during which the exhaust gas and the cleaning liquid contact each other. Accordingly, particulate contaminants and water-soluble VOCs gaseous substances contained in the exhaust gas can be absorbed into the cleaning solution and removed with high efficiency.

The plurality of partition walls 200 may include first partition walls 210 to sixth partition walls 260. The plurality of partition walls 200 may have at least one bent region. Specifically, one bent region may be formed as the second to fourth barrier ribs 220 to 260, or a plurality of bent regions may be formed as the first barrier rib 210 is formed.

Here, since the first partition wall 210, the second partition wall 220, and the third partition wall 230 have a wide area on one surface that can come into contact with the exhaust gas, a vortex capable of removing contaminants contained in the exhaust gas Is effectively created.

Specifically, the first partition wall 210 is installed adjacent to the inlet portion 110, the lower end is a'J' shape formed to bend toward the outlet portion 120, the second partition wall 220 is the first partition wall 210 ) Is installed adjacent to the first partition wall 210, the upper end of the first partition wall 210 is formed to be bent toward the'L' shape. When the exhaust gas introduced from the inlet 110 moves while striking the first partition wall 210 and the second partition wall 220, a vortex of the cleaning solution accommodated inside the main body 100 is formed to contact the exhaust gas and the cleaning solution. The time for this is extended, and this increases the cleaning efficiency of pollutants contained in the exhaust gas.

In addition, the third partition wall 230 is installed adjacent to the second partition wall 220, and a surface extending vertically from the bent region is installed to face the second partition wall 220. That is, even when the exhaust gas passing through the second partition wall 220 hits the third partition wall 230, the vortex of the cleaning solution is generated again, so that the time between the exhaust gas and the cleaning solution is further extended.

The fourth partition wall 240 is installed to cover the space between the first partition wall 210 and the second partition wall 220 from the upper side, and prevents the exhaust gas and the cleaning liquid from rising upward when the exhaust gas moves, and the second partition wall The exhaust gas passing through the 220 may be moved to the third partition wall 230 side.

On the other hand, the fifth partition wall 250 is installed adjacent to the discharge portion 120, and a surface formed vertically extending from the bent region is installed facing the discharge portion 120. The fifth partition wall 250 may block droplets in the exhaust gas moving to the discharge unit 120 from splashing in all directions.

The sixth partition wall 260 is installed such that the upper end is adjacent to the space between the first partition wall 210 and the second partition wall 220, and the lower end is adjacent to the air injection unit 300, which will be described later. That is, the compressed air injected from the air injection unit 300 may be guided to move to the space between the first partition wall 210 and the second partition wall 220 to promote vortex formation.

The air injection unit 300 is installed inside the body unit 100 and is provided to inject compressed air into the body unit 100. The dispersion plate 310 formed vertically on the outer surface of the air injection unit 300 may disperse compressed air injected through the air injection unit 300.

In addition, the air injection unit 300 may be configured as a tube type air distributor, and may be connected to an air compressor (not shown) to operate the air lift mode. . In addition, an air flow meter (not shown) may be connected to the air injection unit 300 to perform a function of adjusting the air inflow rate.

When compressed air supplied from the air compressor is injected into the cleaning liquid through the air injection unit 300, the compressed air is moved along the sixth partition 260 and the cleaning liquid accommodated in the main body 100 is pulled upward. That is, since the water level of the cleaning liquid for forming the vortex is controlled, even if the cleaning liquid is not frequently replenished, the vortex is easily formed.

As described above, the wet cleaning device 1 of the present invention induces a powerful vortex phenomenon by the plurality of partition walls 200 and the air injection unit 300 to effectively remove particulate contaminants and water-soluble VOCs gaseous substances contained in the exhaust gas. It can be removed with a cleaning solution. Therefore, it is possible to prevent the clogging phenomenon caused by contaminants, and this has the advantage of convenient maintenance and low maintenance cost.

In addition, the plurality of partition walls 200 may block flames that may be introduced together with the exhaust gas. That is, when flame and exhaust gas are introduced into the main body 100 in a furnace or the like of a restaurant, an accident such as fire or explosion may occur due to the flame, but the wet cleaning device 1 of the present invention has a flame. It can be blocked while striking the plurality of partition walls 200 and contacting the vortex solution. In addition, since the high-temperature exhaust gas is cooled while contacting the cleaning liquid, an accident such as a fire can be prevented, and in addition, a VOCs reduction device (not shown) installed at the rear end of the wet cleaning device 1 can be protected. .

In addition, since a plurality of partition walls 200 and a relatively simple component such as an air injection unit 300 can obtain a powerful vortex cleaning effect, it is possible to manufacture the device in a small size, and the wet cleaning device 1 of the present invention It is possible to easily expand the scale according to the characteristics of the emission source by connecting a plurality of them after making them as a basic module.

That is, since particulate matters such as oil, powder, fine dust, and bofragi differ greatly for each VOCs emission source, and the VOCs gas properties are greatly different, and the air volume of the exhaust gas is also greatly different, the scale is expanded in response to the characteristics of the emission source. Need to do. At this time, the wet cleaning device 1 of the present invention can be easily scaled up according to the characteristics of each emission source as described above, and it is also possible to manufacture in a very small size, so it can be applied to almost any emission source.

Hereinafter, the present invention will be described in detail by examples with reference to FIGS. 3 to 6. However, the following examples are only illustrative of the present invention, and the contents of the present invention are not limited to the following examples.

Example. Confirmation of fluid flow characteristics and removal efficiency of particulate matter through wet cleaning device

1. Installation of wet cleaning device

The wet cleaning device of the present invention was made based on a stainless material having a width of 720 mm, a height of 1,400 mm, and a thickness of 200 mm.

The diameter of the inlet duct constituting the inlet 110 and the outlet duct constituting the outlet 120 was 140 mm. In addition, the air injection unit 300 was installed to be connected to the air compressor to inject compressed air, and the air inflow rate was adjusted through an air flow meter.

2. Performance evaluation method of wet cleaning device

In order to evaluate the removal efficiency of particulate matter using a wet cleaning device, laboratory-scale cooking facilities were used by applying the conditions of an actual roasting restaurant. A 10 cm diameter hood and duct were installed on a 120 cm x 75 cm tall table, and the pork belly was burned until charred to generate exhaust gas containing particulate matter. The sampling port was selected to be about 2 m or more away from the front/rear end of the wet cleaning device 1 so as not to interfere with the flow of combustion gas.

The particulate matter produced in the process of grilling the pork belly was measured by particle size using a light scattering measurement method. A portable aerosol spectrometer (1109A, GRIMM Aerosol Technik, Germany) that can measure 31 particle diameters ranging from 0.25 to 32 μm and> 32 μm was used, and an isokinetic sampling probe (1152, GRIMM) was used to uniformly aspirate the sample. Did. Isokinetic sampling probes were securely fixed to the sampling ports located at the front and rear ends of the cleaning device to inhale the gas, and the distribution of particulate matter by particle size was monitored in real time by connecting probes and a portable aerosol spectrometer at intervals of 6 seconds. Through this, the removal efficiency was evaluated by measuring the concentration of the particulate matter before entering the wet cleaning apparatus and the concentration of the particulate matter after being processed through the wet cleaning apparatus. The gravimetric correction factor (C-factor) for measurement was assumed to be 1.

In addition, by operating the wet cleaning device and photographing the fluid flow in a plurality of partitions to evaluate the degree of vortex formation. In order to observe the degree of vortex formation, a blue dye was added to the cleaning solution accommodated in the body portion 100. The water level of the washing liquid was measured based on the bottom of the third partition wall 230.

3. Fluid flow characteristics evaluation

As illustrated in FIG. 3, the compressed air injected into the air injection unit 300 was adjusted to evaluate fluid flow characteristics according to the flow rate (CMM) of the cleaning liquid. The water level of the cleaning solution was fixed at 10 cm, and the flow rate was changed to 3, 4, 4.5, 5 CMM. As the flow rate increased, the degree of vortex formation in the plurality of partition walls 200 was excellent. When the flow rate was relatively low at 3 and 4 CMM, the stagnation phenomenon of the cleaning solution occurred in the vicinity of the first partition wall 210 of the'J' shape, but when the flow rate was improved to 4.5 and 5 CMM, the stagnation phenomenon of the cleaning solution was alleviated. .

4. Evaluation of removal efficiency by particle size of particulate matter discharged in the process of roasting pork belly

The removal efficiency of particulate matter by the wet cleaning device of the present invention is shown in Table 1 and FIG. 4. The 31 particle sizes (0.25 to 32 μm,> 32 μm) measured using the light scattering method were divided into four ranges (< 0.5 μm, 0.5 to 1.0 μm, 1.0 to 2.5 μm,> 2.5 μm), respectively. The removal efficiency of each particle size range was determined. The concentration of the particulate matter for evaluating the removal rate was converted to a standard state (0°C, 1 atm). The wet cleaning device was operated while the water level of the cleaning solution was 14 cm and the flow rate was 5 CMM.

Particulate matter removal efficiency (%) Particle Fraction (μm) <0.5 0.5-1.0 1.0-2.5 > 2.5 34.88±2.19 65.27±5.08 92.69±2.09 99.68±0.26

According to the results of Tables 1 and 4, the removal efficiency of the particulate matter by the wet cleaning apparatus 1 of the present invention was improved as the particle size increased. Particulate matter less than 0.5 μm was removed by 34.88%, and the removal rate for the particulate matter of 0.5-1.0 μm size was improved, resulting in a total treatment of 65.27%. In addition, when the particle size was 1.0 μm or more, it showed a high removal efficiency of 90% or more. The removal rate for the particulate matter having a size of 1.0-2.5 μm was 92.69%, and the removal rate for the larger particulate matter having a particle size of 2.5 μm or more was 99.68%, showing a very good removal rate close to 100%.

5. In air volume Evaluation of removal efficiency of particulate matter

In the wet cleaning apparatus of the present invention, the removal efficiency of particulate matter according to the air volume of the exhaust gas containing the particulate matter is shown in Table 2 and FIG. 5. The water level of the cleaning liquid accommodated in the main body 100 was fixed at 10 cm, and the air volume was changed to 3, 4, 4.5, 5 CMM while the air lift mode for injecting compressed air through the air injection unit 300 was operated. Ordered.

Air volume Particle Fraction (μm) <0.5 0.5-1.0 1.0-2.5 > 2.5 1st (3 CMM) 33.55±3.13 ^a 60.79±7.61 ^a 89.69±4.15 ^a 99.67±0.22 ^a 2nd (4 CMM) 36.08±6.55 ^a 61.47±11.06 ^a 90.36±7.15 ^a 99.72±0.41 ^a 3rd (4.5 CMM) 35.38±4.63 ^a 64.27±11.82 ^a 91.65±5.37 ^a 99.74±0.28 ^a 4th (5 CMM) 35.08±5.07 ^a 63.23±10.98 ^a 91.41±4.86 ^a 99.78±0.18 ^a

According to the results of Tables 2 and 5, the removal efficiency of the particulate matter by the wet cleaning device 1 of the present invention did not show a significant difference according to the air volume of the exhaust gas (p<0.05), particle size The removal efficiency improved with increasing. The particle removal rate of 0.5 μm or less was 33.55-35.38%, and the particle removal rate of 0.5-1.0 μm size was 60.79-64.27%. The particle removal rate of 1.0 μm or more increased significantly, and the particle removal rate of 1.0-2.5 μm size was 89.69-91.65%. In addition, the particle removal rate of more than 2.5 μm was 99.67-99.78%, showing a very good removal rate close to 100%.

6. Evaluation of removal efficiency of particulate matter according to the level of cleaning liquid

In the wet cleaning apparatus 1 of the present invention, the removal efficiency of particulate matter according to the water level of the cleaning liquid accommodated inside the main body 100 is shown in Table 3 and FIG. 6. In the state of operating the air lift mode for injecting compressed air through the air injection unit 300, the air volume of the exhaust gas was fixed to 5 CMM, and the water level of the cleaning solution was changed to 3, 6, 10, 14 cm. The difference in removal rate of particulate matter according to was evaluated.

Water Height
(cm) Particle Fraction (μm) <0.5 0.5-1.0 1.0-2.5 > 2.5 3 37.11±2.20 ^a 61.45±2.77 ^b 87.68±2.14 ^c 98.82±0.81 ^c 6 34.00±2.45 ^b 60.56±5.16 ^b 89.49±3.01 ^b 99.11±0.61 ^b 10 35.08±5.07 ^b 63.23±10.98 ^ab 91.41±4.86 ^a 99.78±0.18 ^a 14 34.88±2.19 ^b 65.27±5.08 ^a 92.69±2.09 ^a 99.68±0.26 ^a

According to the results of Table 3 and Figure 6, the removal efficiency of the particulate matter by the wet cleaning apparatus 1 of the present invention showed a significant difference according to the water level (p>0.05). The small particle size of 0.5 μm or less showed the highest removal efficiency (37.11%) when the level of the cleaning solution was 3 cm (p>0.05). When the water level was 6-14 cm, the removal rate of particles less than 0.5 μm was 34.00-35.08%.

On the other hand, the particle removal efficiency of 0.5 μm or more tended to increase significantly as the level of the cleaning solution increased. The particle removal efficiency of 0.5-1.0 μm size was 61.45% (water level 3 cm), 60.56% (water level 6 cm), 63.23% (water level 10 cm), 65.27% (water level 14 cm) depending on the water level, respectively. The removal efficiency of particulate matter in the size of 1.0-2.5 μm showed 87.68% when the water level was 3 cm, and as the water level increased to 6 cm, the removal rate also increased to 89.49%. In addition, the removal rate when the water level of the cleaning solution was 10-14 cm was 91.41-92.69%, indicating a high removal rate of 90% or more. In the case of larger particulate matter of 2.5 μm or more, the removal rate was significantly improved as the level of the cleaning solution increased. When the level of the cleaning solution was set to 3 cm, the removal rate of particles over 2.5 μm was 98.82%, the removal rate at the water level of 6 cm was 99.11%, and the removal rate at the water level of 10-14 cm was 99.68-99.78%. It showed high removal efficiency.

As can be seen through the above results, when using the wet cleaning device of the present invention, by controlling the air volume of the exhaust gas containing the particulate matter, the level of the cleaning liquid, etc., to effectively remove the particulate matter having various particle sizes Was confirmed.

In the above, preferred embodiments of the present invention have been described in detail, but the technical scope of the present invention is not limited to the above-described embodiments and should be interpreted by the claims. At this time, those skilled in the art should consider that many modifications and variations are possible without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Wet cleaning apparatus 100 Body part
110: inlet 120: outlet
121: demister 200: multiple barriers
210: first partition wall 220: second partition wall
230: third partition wall 240: fourth partition wall
250: fifth partition 260: sixth partition
300: air injection unit 310: dispersion plate

Claims (10)

A main body portion in which the inlet portion through which the exhaust gas flows in and the outlet portion through which the exhaust gas is discharged are disposed on opposite sides, and the cleaning liquid is accommodated;
A blower which is connected to the inlet or the outlet and induces a flow of exhaust gas so that the exhaust gas passes between the inlet and the outlet;
A plurality of partition walls which are installed spaced apart from each other in the main body, and form an air passage through which exhaust gas flows; And
It is installed inside the body portion, characterized in that it comprises an air injection unit for injecting compressed air to the cleaning liquid.
According to claim 1,
The plurality of partition walls is wet cleaning apparatus characterized in that one side is installed to face the exhaust gas flowing from the inlet.
According to claim 2,
The plurality of partition walls is wet cleaning apparatus characterized in that at least one bent region is formed.
According to claim 3,
The plurality of partition walls is wet cleaning apparatus, characterized in that comprises a first to sixth partition wall.
According to claim 4,
The first partition wall is installed adjacent to the inlet, the lower end is formed to bend toward the outlet,
The second partition wall is installed adjacent to the first partition wall, a wet cleaning apparatus characterized in that the upper end is formed to be bent toward the first partition wall side.
The method of claim 5,
The third barrier rib is installed adjacent to the second barrier rib, and a surface formed vertically extending from the bent region faces the second barrier rib.
The method of claim 6,
The fourth partition wall is a wet cleaning device, characterized in that installed to cover the space between the first partition wall and the second partition wall from the upper side.
The method of claim 7,
The fifth partition wall is installed adjacent to the discharge portion, the wet cleaning device characterized in that the surface extending vertically from the bent region faces the discharge portion.
The method of claim 8,
The sixth partition wall has a top end adjacent to a space between the first partition wall and the second partition wall, and a wet cleaning apparatus characterized in that the bottom end is installed adjacent to the air injection unit.
The method of claim 9,
It characterized in that it is formed perpendicular to the upper surface of the outer surface of the air injection unit, further comprising a dispersion plate for dispersing the compressed air injected through the air injection unit.

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