KR102580999B1 - Electric precipitator applicable to humid environment - Google Patents

Abstract

The present invention relates to an electric dust collector applicable to a humid environment. The electric dust collector applicable to a humid environment according to the present invention includes a plurality of dust collection electrodes arranged in parallel with the direction of movement on an air movement path; and a high voltage application unit that applies a high voltage to one dust collection electrode of a pair of adjacent dust collection electrodes and applies a voltage of opposite polarity to the high voltage or ground to the other dust collection electrode, wherein the dust collection electrode collects dust in the form of a film. It is characterized by comprising a film and a fixed frame made of a rigid material that supports the edge of the dust collection film.

Description

Electric dust collector applicable to humid environments {ELECTRIC PRECIPITATOR APPLICABLE TO HUMID ENVIRONMENT}

The present invention relates to an electric dust collector applicable to a humid environment. More specifically, the present invention relates to an electric dust collector applicable to a humid environment, in which the dust collection electrode can be formed in a film type and have a large area, and the moisture collected in the dust collection electrode can be easily discharged. It relates to applicable electrostatic precipitator devices.

An electrostatic precipitator is a device that purifies the air by charging contaminants such as dust contained in the air and collecting the charged contaminants on a dust collection plate using electrostatic force.

A general electrostatic precipitator includes a charging unit 10 that ionizes dust in the air, as shown in Korean Patent No. 10-1610024 (Patent Document 1), and a dust collection unit 20 that collects dust particles charged in the charging unit 10. ) (see Figure 1).

The charging unit 10 is made of a thin wire made of tungsten and has a discharge line 11 forming an anode and a pair of discharge lines installed up and down with a certain height difference from the discharge line 11 to form a cathode. It may include a pole plate (12).

When high voltage is applied to the discharge line 11, current begins to flow due to the high potential difference formed between the discharge line 11 and the discharge response plate 12, and a corona discharge occurs to charge dust in the air flowing in the direction of the arrow. do. A plurality of discharge lines 11 and discharge response plates 12 may be installed side by side at regular intervals.

The dust collection unit 20 is formed by alternately stacking first dust collection electrodes 21 and second dust collection electrodes 22 to collect charged dust particles in the charging unit 10, and the first dust collection electrode 21 ) is applied to a high voltage of the same polarity as the discharge line 11, and a voltage of the opposite polarity to the high voltage is applied to the second dust collection electrode 22 or grounded.

When high voltage is applied to the discharge line (11), current begins to flow due to the high potential difference formed between the discharge line (11) and the discharge response plate (12), and a corona discharge occurs, which positively charges dust particles in the air. I order it. Dust particles that are positively charged in the charging unit 10 are collected by the second dust collecting electrode 22 on the relatively negative side as they pass through the dust collecting unit 20.

This electric precipitator can increase dust collection efficiency by alternately arranging a plurality of first dust collection electrodes and a plurality of second dust collection electrodes.

Conventionally, the dust collection plate is generally made of a metal plate, but there is a problem in that metal plates such as SUS can be easily corroded when used in air containing corrosive gases, such as in semiconductor equipment. In addition, when the size (area) of the dust collection plate increases, there is a problem in that it is difficult to manufacture it thinly with a metal plate and the weight becomes heavy. Furthermore, recently, conductive non-metallic plates using carbon fiber reinforced plastic (CFRP) are being applied in corrosive environments, but when the size is larger than 1 m, they are manufactured with a thickness of at least 5 mm or more to maintain flatness. Therefore, it has excellent corrosion resistance, but has the disadvantage of being less economical than existing SUS.

Accordingly, recently, a film-type dust collection plate manufactured by coating a base film with a conductive material such as carbon has been used. In this case, it has strong corrosion resistance, is lightweight, has a low manufacturing cost, and can be produced in large quantities, thereby solving the problems of the metal plate type dust collection plate and CFRP type dust collection plate mentioned above.

However, as shown in FIG. 2, in the case of the dust collection film 540a disclosed in Korean Patent No. 10-1839557, one side is composed of a short side and the other side is composed of a long side to ensure flatness, but a certain amount is provided on the long side. By disposing a plurality of spacing maintenance parts at intervals, the spacing and flatness between the plurality of films 540a are maintained.

As such, conventional film-type dust collection plates are generally manufactured with a width of about 10 cm due to the characteristics of flexible materials, and are therefore applied only to small household air purifiers. This is because when the width of the dust collection plate becomes larger than 10cm, the film-type dust collection plate is easily bent by heat during the carbon coating and drying process, and its flatness rapidly decreases. In addition, due to the characteristics of the flexible material, as the size of the film-type dust collection plate increases, it is difficult to ensure flatness, making it difficult to maintain the gap with adjacent dust collection plates, resulting in the problem that the dust collection plate cannot be enlarged.

In addition, if the contaminated air contains a large amount of moisture, moisture and water droplets stick to the connection between the dust collection plate and the gap maintenance part, and the potential difference between two adjacent dust collection plates decreases, so that an electric field is not formed or insulation is lost, so the gap between the dust collection plates and the adjacent dust collection plate is reduced. Since frequent breakdowns and functional deterioration occur due to insulation breakdown, film-type dust collection plates must be used only in relatively dry indoor environments.

In particular, conventional electrostatic precipitators have been widely used as home air purifiers, and have recently been used for exhaust purification in large spaces or large industrial facilities such as subway station air conditioners, semiconductor manufacturing processes, and thermal power plants. As the processing capacity of the device increases to purify a large amount of polluted air, the size of the dust collection plate used also inevitably increases. As mentioned above, although the film type dust collection plate can solve the problems of the metal plate type dust collection plate, , there was a problem that it could not be produced on a large scale.

Republic of Korea Patent No. 10-1610024 Republic of Korea Patent No. 10-1839557

Accordingly, the purpose of the present invention is to solve such conventional problems and to provide an electric dust collection device that can be applied to a humid environment in which the dust collection electrode is formed in a film type and can be expanded to a large area.

In addition, by facilitating the discharge of moisture collected in the dust collection electrode, the potential difference between two adjacent dust collection plates is reduced by the collected water droplets, so that an electric field is not formed or insulation is lost, resulting in insulation breakdown between adjacent dust collection plates. The aim is to provide an electric dust collector applicable to humid environments, which can prevent frequent breakdowns and functional deterioration and can be used smoothly even in humid environments containing highly corrosive moisture.

The above object is, according to the present invention, a plurality of dust collection electrodes arranged in parallel with the direction of movement on the air movement path; and a high voltage application unit that applies a high voltage to one dust collection electrode of a pair of adjacent dust collection electrodes and applies a voltage of opposite polarity to the high voltage or ground to the other dust collection electrode, wherein the dust collection electrode collects dust in the form of a film. This is achieved by an electric dust collector applicable to a humid environment, including a film and a fixed frame made of a rigid material that supports the edge of the dust collection film.

Here, the fixed frame preferably includes a lower frame that supports the lower end of the dust collection film, and the upper surface of the lower frame is preferably formed as an inclined surface.

In addition, it is preferable that the lower frame is formed with a drainage hole capable of discharging water droplets flowing down the inclined surface.

Additionally, it is preferable that the inclined surface of the lower frame is inclined downward toward the drain hole.

In addition, the drain hole is preferably formed in a form where a part of the lower frame is omitted to expose the dust collection film.

In addition, it is preferable to further include a drain pipe disposed below the drain hole to collect water droplets discharged through the drain hole and discharge them to the outside.

Additionally, the dust collection film preferably includes a non-conductive film and a conductive layer coated on the non-conductive film.

Additionally, the fixing frame is preferably made of a conductive material, and the dust collection film is electrically connected to the high voltage application unit through the fixing frame.

In addition, the plurality of dust collection electrodes are divided into a plurality of first dust collection electrodes to which a high voltage is applied, and second dust collection electrodes to which a voltage of opposite polarity to the high voltage is applied or grounded and alternately disposed with the first dust collection electrode, It is preferable that the plurality of first dust collection electrodes and the plurality of second dust collection electrodes are structurally and electrically connected to each other by a first fixed rod and a second fixed rod.

Additionally, it is preferable that the first fixed rod and the second fixed rod are fixed to the fixed frame.

In addition, the first dust collection electrode is formed to have a relatively larger width than the second dust collection electrode, and the second fixed rod penetrates the position corresponding to the second fixed rod of the first dust collection electrode without contacting the second fixed rod. It is desirable for an interference prevention hole to be formed.

According to the present invention, the dust collection electrode can be formed in a film type and have a large area, so it is an electric dust collector applicable to humid environments that can be used for exhaust purification of large spaces such as subway station air conditioners, semiconductor manufacturing processes, and thermal power plants, or large industrial facilities. is provided.

In addition, by facilitating the discharge of moisture collected in the dust collection electrode, the potential difference between two adjacent dust collection plates is reduced by the collected water droplets, so that an electric field is not formed or insulation is lost, resulting in insulation breakdown between adjacent dust collection plates. An electric dust collector applicable to humid environments is provided, which can prevent frequent breakdowns and functional deterioration and can be used smoothly even in humid environments containing highly corrosive moisture.

Figure 1 is a diagram showing the basic principle of a general two-stage electric dust collector;
Figure 2 is a diagram showing the assembly structure of a conventional film-type dust collection plate and a gap maintenance part;
Figure 3 is a perspective view of the electrostatic precipitator applicable to a humid environment according to the present invention;
Figure 4 is a front view of the electrostatic precipitator applicable to a humid environment according to the present invention;
Figure 5 is a side cross-sectional view of the electrostatic precipitator applicable to a humid environment according to the present invention;
Figure 6 is a cross-sectional view of the dust collection electrode shown in Figure 5;
Figure 7 is a diagram showing the drainage action of the electrostatic precipitator applicable to a humid environment according to the present invention.

Prior to explanation, in various embodiments, components having the same configuration will be representatively described in the first embodiment using the same symbols, and in other embodiments, configurations different from the first embodiment will be described. do.

Hereinafter, an electric dust collector applicable to a humid environment according to the first embodiment of the present invention will be described in detail with reference to the attached drawings.

Among the accompanying drawings, Figure 3 is a perspective view of an electrostatic precipitator applicable to a humid environment according to the present invention, Figure 4 is a front view of an electrostatic precipitator applicable to a humid environment according to the present invention, and Figure 5 is an electrostatic precipitator applicable to a humid environment according to the present invention. It is a side cross-sectional view of the device, Figure 6 is a cross-sectional view of the dust collection electrode shown in Figure 5, and Figure 7 is a functional diagram showing the drainage action of the electric dust collection device applicable to a humid environment of the present invention.

An electric dust collector applicable to a humid environment according to an embodiment of the present invention includes a housing, a plurality of dust collection electrodes, a high voltage application unit 120, a first fixed rod (130a), a second fixed rod (130b), and a drain pipe (140). ) includes.

The housing (not shown) forms a passage for contaminated air to be collected, and has an inlet on one side and an outlet on the other side.

The plurality of dust collection electrodes include a first dust collection electrode (110a) to which a high voltage is applied and a second dust collection electrode (110b) to which a voltage of opposite polarity to the high voltage is applied or grounded so as to have a potential difference with the first dust collection electrode (110a). can be distinguished. In the following description, the second dust collection electrode 110b is explained as an example of being grounded.

The first dust collection electrode 110a and the second dust collection electrode 110b each have a flexible film-shaped dust collection film 111 and a rigid frame 112 that supports the edge of the dust collection film 111. It can be configured to include.

The dust collection film 111 is made of a non-conductive film 111a made of flexible plastic, an electrically conductive layer 111b formed on the non-conductive film 111a, and an insulating material on the conductive layer 111b. It may be configured to include a coating layer 111c.

In addition, the conductive layer 111b and the coating layer 111c are formed only on one side of the non-conductive film 111a, as shown in (a) of FIG. 6, or on the non-conductive film 111a, as shown in (b) of FIG. 6. can be formed on both sides.

The non-conductive film 111a may be a flexible plastic film. For example, PET film or PVC film can be used.

The conductive layer 111b may be formed through carbon coating. Although carbon is a non-metal, it has electrical conductivity and is incomparably lighter than metal. It also has the advantage of having strong corrosion resistance against corrosive gases. Furthermore, it can be easily manufactured by coating the non-conductive film 111a, and has the advantage of low manufacturing cost.

Next, a coating layer 111c is formed on the conductive layer 111b with an insulating material (eg, plastic). The coating layer 111c is formed to the same size as the non-conductive film 111a, so that the conductive layer 111b is formed between the coating layer 111c and the non-conductive film 111a, and the conductive layer 111b is formed as described above. It is desirable to ensure that the edges are not exposed to the outside. The conductive layer 111b formed of a carbon coating has strong corrosion resistance by itself, but can have even stronger corrosion resistance due to the coating layer 111c.

The fixing frame 112 is made of a hard rigid material and supports the edge of the dust collection film 111. This fixing frame 112 is coupled along the edge of the dust collection film 111 to support the support film 111 in a tightly pulled state, and is fixed to the edge of the dust collection film 111 through bonding. However, it is not limited to this and can also be fixed by mechanical coupling.

Therefore, in the present invention, the flatness of the dust collection film 111, which is formed in the form of a film, can be maintained by the fixed frame 112 made of a rigid material, and a large dust collection electrode in the form of a film with a width of 1 m or more that is not easily bent or curved can be implemented. You can.

At this time, the conductive layer 111b is preferably formed to be slightly smaller than the non-conductive film 111a. That is, the edge of the conductive layer 111b is formed inside the edge of the non-conductive film 111a, so that the edge of the conductive layer 111b is not exposed to the outside. This prevents sparks from occurring when a high voltage is applied to the conductive layer 111b and ensures electrical stability.

In addition, an electrically conductive portion (not shown) is formed in the coating layer 111c located on the edge of the dust collection film 111 to expose a portion of the conductive layer 111b, so that the dust collection film 111 is formed by the electrically conductive portion. The fixing frame 112 fixed to the edge and the conductive layer 111b are electrically connected to each other.

The dust collection electrode in which the fixing frame 112 is coupled to the dust collection film 111 as described above is a first dust collection electrode 110a to which a high voltage is applied or a second dust collection electrode to which a high voltage is applied by grounding or applying a high voltage to the fixing frame 112. It can be used as a dust collection electrode (110b).

Meanwhile, the fixing frame 112 includes a lower frame 112a fixed to the lower end of the dust collection film 111. Accordingly, when dust collection operation is performed in a humid environment, moisture collected on the dust collection film 111 flows down in the form of water droplets and falls on the upper surface of the lower frame 112a forming a step with the surface of the dust collection film 111. can be collected. At this time, as the water droplets collected on the upper surface of the lower frame 112a protrude from the surface of the dust collection film 111, the potential difference with the adjacent dust collection electrode decreases, so that an electric field is not formed or an electric field is formed between the adjacent dust collection electrodes. There is a risk of failure or deterioration of function due to insulation breakdown.

According to this embodiment, the upper surface of the lower frame 112a constituting the fixed frame 112 is made of an inclined surface 112b with a predetermined slope, and a drain hole 112c is formed at the bottom of the inclined surface 112b. This is formed. For example, a drain hole 112c is formed in one area of the lower frame 112a, and the inclined surface 112b of the lower frame 112a in contact with the drain hole 112c is inclined downward toward the drain hole 112c. It can be.

Here, the drain hole 112c may be formed in such a way that a part of the lower frame 112a is omitted to expose the dust collection film 111. That is, the moisture collected on the dust collection film 111 and flowing down in the form of water droplets is guided to the drain hole 112c by the inclined surface 112b of the lower frame 112a, where the dust collection film 111 and the drain hole 112c ) Since there is no separate boundary between them, it can smoothly escape to the lower part of the dust collection film 111 through the drain hole 112c.

Accordingly, in a humid environment, the moisture collected along with fine dust can be easily discharged to the lower part of the dust collection electrode, and the collected moisture can be discharged directly through the drain hole 112c rather than staying in the dust collection electrode, so in a humid environment. Not only can it be used in a highly corrosive and humid environment, but it can also minimize the deterioration of the durability of the dust collection electrode due to corrosive moisture.

In addition, in FIGS. 2 and 3, the drain hole 112c of the first dust collection electrode 110a is disposed at the lower part of one side, and the drain hole 112c of the second dust collection electrode 110b is disposed at the lower center. Although shown, it is not limited thereto, and the drain hole 112c of the first dust collection electrode 110a and the second dust collection electrode 110b are used to unify the drain pipe 140 disposed below the drain hole 112c. It would be desirable to arrange the drain holes 112c at positions corresponding to each other.

From now on, the operation of the first embodiment of the electrostatic precipitator applicable to the above-described humid environment will be described.

The electric dust collector applicable to a humid environment according to this embodiment is like a typical two-stage electric dust collector, as contaminated air passes through a charged part, fine particles contained in the contaminated air are charged with positive ions (or negative ions), and then As the charged particles pass through the dust collection unit, they stick to the grounded second dust collection electrode (110b) by electrostatic force formed by the potential difference between the first dust collection electrode (110a) and the second dust collection electrode (110b).

Specifically, the first dust collection electrode (110a) and the second dust collection electrode (110b) are arranged side by side at a predetermined distance, and are generated by a potential difference between the first dust collection electrode (110a) and the second dust collection electrode (110b). Charged particles can be moved and collected by the power of the electric field. For example, when a positive high voltage is applied to the first dust collection electrode 110a and positive ions are generated at the charged portion, particles charged with positive ions may be collected on the grounded second dust collection electrode 110b.

In particular, the dust collection electrode of this embodiment is configured to support the edge of the dust collection film 111, which is in the form of a film, with a fixed frame 112 made of a rigid material, so that the dust collection electrode in the form of a film has a large area and has high flatness. Since it can be secured, it can be used for exhaust purification in large spaces or large industrial facilities such as subway station air conditioners, semiconductor manufacturing processes, and thermal power plants.

In addition, as shown in FIG. 7, a drain hole 112c is formed in the lower frame 112a of the fixed frame 112 supporting the edge of the dust collection film 111, and the lower frame 112a has a drain hole 112c. It is placed sloping downward. Accordingly, in the process of the moisture collected on the surface of the dust collection film 111 flowing down in the form of water droplets (W), it is naturally guided to the drain hole 112c along the inclined surface 112b of the lower frame 112a, and is naturally guided to the drain hole 112c. The water droplets (W) discharged to the outside through (112c) may be discharged to the outside of the device through the drain pipe 140 disposed below the drain hole (112c). Accordingly, since the moisture collected in the dust collection electrode can be easily discharged in a high humidity environment, the dust collection operation can be performed smoothly even in a high humidity environment, especially in an environment containing highly corrosive moisture.

Meanwhile, by providing a plurality of first dust collection electrodes 110a and a plurality of second dust collection electrodes 110b and arranging them alternately, the dust collection area can be expanded and dust collection efficiency can be increased. In order to achieve maximum dust collection efficiency in the limited internal space of the housing, it is desirable to enlarge the area of the first dust collection electrode (110a) and the second dust collection electrode (110b) or reduce the separation distance.

In the past, dust collection electrodes were constructed in the form of a thin conductive film, and a separate gap maintenance part made of insulating material was placed between the dust collection electrodes to maintain the flatness of the dust collection electrodes and the gap between them. However, if the contaminated air contains a large amount of moisture, moisture and water droplets stick to the connection between the dust collection electrode and the gap maintenance part, and the potential difference between two adjacent dust collection electrodes decreases, so that an electric field is not formed or insulation is lost, so that the adjacent dust collection electrode and There is a problem of frequent breakdowns and functional deterioration due to insulation breakdown.

According to this embodiment, as shown in FIGS. 4 and 5, a plurality of first dust collection electrodes 110a are structurally connected by the first fixed rod 130a, and the gap between them is maintained by the first fixed rod 130a. It is electrically connected to the high voltage application unit and receives high voltage.

At this time, the first fixing rod 130a is fixed in a way that penetrates the fixing frame 112, thereby enabling the plurality of first dust collection electrodes 110a to be stably connected.

In addition, the width of the first dust collection electrode (110a) is set larger than that of the second dust collection electrode (110b), and the first fixed rod (130a) connecting the first dust collection electrode (110a) is the second dust collection electrode (110a). Since it is arranged at an interval wider than the width of (110b), the first fixed rod (130a) that structurally and electrically connects the plurality of first dust collection electrodes (110a) can be prevented from interfering with the second dust collection electrode (110b). .

In addition, the second dust collection electrodes 110b, which are alternately arranged with the first dust collection electrode 110a, are connected to each other by the second fixed rod 130b so that the gap between them is maintained and the second dust collection electrode 110b is connected to the second fixed rod 130b. It is electrically connected to the high voltage application part and is grounded.

At this time, the second fixing rod 130b is fixed in a form that penetrates the fixing frame 112, thereby stably connecting the plurality of second dust collection electrodes 110b.

In addition, since an interference prevention hole 111d through which the second fixed rod 130b can pass is formed on the plate surface of the first dust collection electrode 110a, a plurality of second dust collection electrodes 110b are electrically connected. The second fixed rod 130b can be prevented from interfering with the first dust collection electrode 110a.

As described above, the plurality of first dust collection electrodes (110a) are structurally connected by the first fixed rod (130a) to maintain the gap between them, and the plurality of second dust collection electrodes (110b) are connected to each other by the second fixed rod (130b). Since they are structurally connected and the gap between them is maintained, the first dust collection electrode (110a) and the second dust collection electrode (110b) are maintained in order to maintain the gap between the first dust collection electrode (110a) and the second dust collection electrode (110b) as in the prior art. ) There is no need to place a separate gap maintenance part that directly connects. Therefore, it is possible to prevent frequent breakdowns and functional deterioration from occurring due to insulation breakdown due to moisture and water droplets adhering to the joint area between the dust collection electrode and the gap maintenance part, as in the past.

The scope of the present invention is not limited to the above-described embodiments, but may be implemented in various forms of embodiments within the scope of the appended claims. It is considered to be within the scope of the claims of the present invention to the extent that anyone skilled in the art can make modifications without departing from the gist of the invention as claimed in the claims.

110a: first dust collection electrode, 111b: second dust collection electrode, 111: dust collection film,
111a: non-conductive film, 111b: conductive layer, 111c: coating layer,
111d: interference prevention hole, 112: fixed frame, 112a: lower frame,
112b: slope, 112c: drain hole, 120: high voltage applicator,
130a: first fixed rod, 130b: second fixed rod, 140: drain pipe

Claims (11)

A plurality of dust collection electrodes arranged in parallel with the direction of movement on the air movement path;
A high voltage application unit that applies a high voltage to one dust collection electrode of a pair of adjacent dust collection electrodes and applies a voltage of opposite polarity to the high voltage or ground to the other dust collection electrode; and
The dust collection electrode includes a film-shaped dust collection film and a fixed frame made of a rigid material that supports an edge of the dust collection film,
The fixing frame includes a lower frame supporting the lower end of the dust collection film,
A drain hole is formed in one area of the lower frame to discharge water droplets flowing down from the surface of the dust collection film to the lower part of the lower frame,
The upper surface of the lower frame, which forms a step with the surface of the dust collection film, is composed of an inclined surface arranged downwardly toward the drain hole so that water droplets flowing along the surface of the dust collection film can be guided toward the drain hole,
At the bottom of the plurality of dust collection electrodes, a drain pipe that collects water droplets discharged through the drain hole and discharges them to the outside is spaced apart from the dust collection electrode at a position corresponding to the bottom of the drain hole and intersects the plurality of dust collection electrodes. An electrostatic precipitator applicable to humid environments. delete delete delete According to clause 1,
The drain hole is an electric dust collector applicable to a humid environment in which a part of the lower frame is omitted to expose the dust collection film. delete According to clause 1,
The dust collection film is an electric dust collector applicable to a humid environment including a non-conductive film and a conductive layer coated on the non-conductive film. According to clause 1,
An electric dust collector applicable to a humid environment in which the fixed frame is formed of a conductive material, and the dust collection film is electrically connected to the high voltage application unit through the fixed frame. According to clause 8,
The plurality of dust collection electrodes are divided into a plurality of first dust collection electrodes to which a high voltage is applied, and a plurality of second dust collection electrodes to which a voltage of opposite polarity to the high voltage is applied or grounded and alternately disposed with the first dust collection electrodes. The first dust collection electrode and the plurality of second dust collection electrodes are structurally and electrically connected by a first fixed rod and a second fixed rod, respectively. An electric dust collector applicable to a humid environment. According to clause 9,
An electric dust collector applicable to a humid environment in which the first fixed rod and the second fixed rod are fixed to the fixed frame. According to clause 10,
The first dust collection electrode is formed to have a relatively larger width than the second dust collection electrode, and the second fixed rod can penetrate a position corresponding to the second fixed rod of the first dust collection electrode without contacting the second fixed rod. An electric dust collector applicable to humid environments where anti-interference holes are formed.