KR101741517B1

KR101741517B1 - Electric dust collecting apparatus and method for collecting dust

Info

Publication number: KR101741517B1
Application number: KR1020150094911A
Authority: KR
Inventors: 김종호; 김홍직
Original assignee: 한서대학교 산학협력단; 김종호
Priority date: 2015-07-02
Filing date: 2015-07-02
Publication date: 2017-05-31
Also published as: KR20170004494A

Abstract

There is provided an electric dust collecting apparatus and a dust collecting method capable of treating an object such as fine dust more cleanly and effectively. The electric dust collecting device includes a dust collecting part at least partially made of a conductor, a discharging part spaced apart from the dust collecting part and at least a part made of a conductor, a flow path formed inside the discharging part, an opening part connected to the flow path, And a power supply unit for applying an electric voltage to the discharge unit to form an electric field, wherein the conductive fluid is sprayed in the form of droplets from the opening portion by an electric force, and between the discharge portion and the dust collection portion A corona discharge is generated around the droplet adjacent to the discharge side.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric dust collecting apparatus and method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric dust collector and a dust collecting method, and more particularly, to an electric dust collector and a dust collecting method that can treat objects such as fine dust more cleanly and effectively.

There are various pollutants in the atmosphere. Pollutants can be generated naturally in response to environmental changes, or they can be released from the combustion equipment of the factory, etc., and may be generated secondarily from other pollutants. Contaminants are distributed in the air as particles and cause various pathologies such as respiratory diseases, ophthalmic diseases, skin diseases, and may cause blurring of vision and deterioration of visual range.

Particularly, fine dust particles having a particle diameter of several micrometers or less react with other contaminants to generate additional contaminants, and when the adsorbent surface area is large, it can function as a means for moving various obstacles. Fine dusts can cause or exacerbate diseases related to the heart, lungs, respiratory tracts, etc., and effective treatment is required.

Airborne pollutants can be treated by methods such as using electric force, centrifugal force, filtration materials, adsorbent materials, and other materials that can be processed physically and chemically. Among them, the treatment method using electric force is simple and economical because of its simple structure, but it has been known that the treatment efficiency of fine dust having a relatively small particle diameter is low.

That is, in the conventional case, it is difficult to effectively treat contaminants such as fine dust by a method using an electric force, and improvement is needed. In the conventional case, the electric power can be increased by increasing the electric power. However, there is a problem that the device is overloaded and the operation is difficult or the excessive electric power is consumed compared with the throughput. In addition, there is a problem that the treatment efficiency is substantially lowered due to re-scattering of fine dust or the like in the process of separating contaminants adhered to the electrode plate.

Korean Patent Publication Nos. 10-2015-0045069, (2015.04.28), and 3

An object of the present invention is to provide an electric dust collecting apparatus capable of treating an object to be treated such as fine dust more cleanly and effectively, And to provide a dust collecting method that can be effectively treated.

The electric dust collector according to the present invention comprises: a dust collecting part at least partially made of a conductor; A discharge part spaced apart from the dust collecting part and at least a part of which is made of a conductor; A flow path formed inside the discharge part; An opening connected to the flow path and opened to the surface of the discharge part; A fluid injecting part injecting a conductive fluid into the flow path and discharging the conductive fluid to the opening part; And a power supply unit for applying an electric voltage to the discharge unit to form an electric field, wherein the conductive fluid is sprayed in the form of droplets from the opening by an electric force, and the conductive fluid is sprayed in the form of droplets between the discharge unit and the dust collection unit, A corona discharge is created around the droplet.

The corona discharge may include a streamer corona discharge.

The fluid injecting unit may include a water tub in which the conductive fluid is stored and at least a part of the conductive fluid is supplied to the flow channel, and a fluid pump that transports the conductive fluid to the water tub.

The electrostatic precipitator may further include a fluid recovery unit that recovers the conductive fluid discharged to the opening, and at least a part of the recovered conductive fluid may be recycled to the fluid injection unit.

The electric dust collector may further include a controller for controlling operations of the fluid injecting unit and the power source unit.

When the operation signal of any one of the power source unit and the fluid injection unit is inputted first, the control unit may transmit a control signal to the other one to synchronize the operation of the power source unit and the fluid injection unit.

The control unit may change the other one if the power supply amount of the power supply unit and the fluid supply amount of the fluid injection unit are changed.

The dust collecting part may be formed in a hollow shape and the discharge part may be formed in a hollow bar shape separated from the dust collecting part and inserted into the dust collecting part.

The openings may be formed in a plurality of openings so that at least a part of the openings may be opened in different directions toward the inner circumferential surface of the dust collecting portion on the surface of the discharge portion.

The dust collecting part and the discharging part extend in a gravitational direction and a processing space is formed between the dust collecting part and the discharge part in a direction opposite to the direction of gravity and the conductive fluid can be sprayed into the processing space.

A dust collecting method according to the present invention is a dust collecting method comprising the steps of: (a) a discharger including a dust collecting portion, a flow path and an opening portion connected to the flow path, a fluid injecting portion injecting a conductive fluid into the flow path to discharge the conductive fluid into the opening portion, A step of preparing an electric dust collector including a power supply unit for applying an electric field to form an electric field; And (b) injecting the conductive fluid into the flow passage, spraying the conductive fluid in the form of droplets from the opening portion by applying a voltage, and spraying the conductive fluid around the droplet adjacent to the discharge portion side between the discharge portion and the dust- And generating and collecting a corona discharge.

The voltage may be that of forming an electric field having an intensity of -3.5 to -4.5 kV / cm.

The object to be collected in the step (b) 0.14 to 1.30 [mu] m.

The corona power ratio due to the corona discharge may be 9.42 to 35.3 W / (m3 / min).

The dust collecting method may further include the step of recovering the conductive fluid sprayed from the opening of the step (b) and recirculating at least a part of the recovered conductive fluid to the fluid injecting part.

The electric dust collector according to the present invention can treat pollutants including fine dust more cleanly and effectively. The electric dust collecting apparatus can effectively and efficiently treat objects such as fine dusts by using not only the electric force but also the conductivity and fluidity of the fluid in an organic or complex manner. Also, the dust collecting method according to the present invention can clean and effectively treat contaminants including fine dust using electric force and fluid.

1 is a perspective view of a main portion of an electric dust collector according to an embodiment of the present invention.
2 is a configuration diagram illustrating the configuration of an electric dust collector according to an embodiment of the present invention.
3 is an operation diagram of a discharge unit of the electric dust collector of FIG.
FIG. 4 is a view showing the operation of the electric dust collector of FIG. 2. FIG.
5 is a flowchart showing a dust collecting method according to an embodiment of the present invention.
6 is a configuration diagram of an experimental apparatus applied to an experimental example of the present invention.
FIG. 7 is a graph showing the concentration distribution of the contaminant particles generated according to particle size in an experimental example of the present invention. FIG.
8 is a graph showing a relationship between an applied voltage and an amount of current in an experimental example of the present invention.
9 is a photograph showing an actual state of a corona discharge according to an applied voltage in an experimental example of the present invention.
10 is a graph showing the relationship between the electric field strength and the dust collection efficiency in an experimental example of the present invention.
11 is a graph showing the comparison between the inlet concentration of the contaminant particles and the concentration after the treatment for different electric field intensities in an experimental example of the present invention.
FIG. 12 is a graph showing the relationship between the size of the contaminant particles and the dust collecting efficiency with respect to different electric field intensities in an experimental example of the present invention. FIG.
13 is a graph showing the relationship between the corona power ratio and the dust collection efficiency of the present invention in an experimental example of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and methods for achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is intended that the scope of the invention be limited only by the terms of the invention, as defined by the appended claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, an electrostatic precipitator according to an embodiment of the present invention, a dust collecting method according to an embodiment of the present invention, and an experimental example of the present invention will be described in detail with reference to FIGS. 1 to 12. FIG. First, the electric dust collector will be described in detail, and the dust collecting method will be described in detail, and then an experimental example will be described.

First, the electric dust collector will be described in detail.

FIG. 1 is a perspective view of an electric dust collector according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating the configuration of an electric dust collector according to an embodiment of the present invention. The dust collecting part of FIG. 2 is cut along the longitudinal direction and is shown as a longitudinal section showing the inside thereof.

1 and 2, an electric dust collecting apparatus 1 according to an embodiment of the present invention includes a dust collecting part 100 at least partially made of a conductor, a discharge part spaced apart from the dust collecting part 100, A flow path 210 formed in the discharge part 200 and an opening 220 connected to the flow path 210 and opened to the surface of the discharge part 200. The conductive fluid is injected into the flow path 210, (See 300 in FIG. 2) for discharging the fluid to the discharge unit 220, and a power supply unit 400 for applying an electric voltage to the discharge unit 200 to form an electric field. The conductive fluid is divided into small particles by an electric force and is sprayed in a droplet form from the opening portion 220. The conductive fluid is sprayed around the droplet adjacent to the discharge portion 200 side between the discharge portion 200 and the dust collecting portion 100, A corona discharge is generated.

The electric dust collecting apparatus 1 according to the embodiment of the present invention has a structure in which the dust collecting unit 100 and the discharging unit 200 are disposed adjacent to each other. In particular, when the fluid is injected into the flow path 210 inside the discharging unit 200, And can be discharged to the opening 220. One side of the opening 220 is connected to the flow path 210 and the other side is opened to the outer surface of the discharge part 200 to discharge the fluid. In this case, the fluid is a conductive fluid that can be energized, and may be sprayed to the outside of the discharge unit 200 by an electric force, thereby expanding the discharge unit 200. Therefore, a strong corona discharge (B) that grows widely around the discharge part 200 side between the dust collecting part (100) and the discharge part (200) can be generated, so that contaminant particles such as fine dust can be easily charged.

Further, the conductive fluid may be dispersed in a fine droplet form and may reach the inner surface of the dust collecting part 100 while scattering. As a result, fine contaminant particles can be easily treated by not only electric force but also physical contact between particles and collision process. That is, by using the electric force between the dust collecting unit 100 and the discharging unit 200, the electric force of the charged particles, and the diffusion, collision, blocking, etc. between particles distributed between the dust collecting unit 100 and the discharging unit 200, It is also possible to treat pollutant particles such as dust very effectively.

Further, the fluid droplets reaching the inner surface of the dust collecting unit 100 adhere to each other and flow down by gravity, and also function to clean the pollutants collected in the dust collecting unit 100. Therefore, it is possible to prevent the re-scattering of the contaminant particles, so that contaminant particles having a small particle size such as fine dust can be treated very cleanly and effectively. Hereinafter, the electrostatic precipitator 1 according to one embodiment of the present invention having such characteristics will be described in more detail with reference to the respective drawings.

1 and 2, the dust collecting part 100 may be hollow. At least a part of the dust collecting unit 100 is formed of a conductor and is configured to be energized, and the inside of the dust collecting unit 100 may be formed into an empty cylindrical shape. However, the present invention is not limited thereto, and the dust collecting unit 100 may be modified into various shapes (for example, a plate shape or the like) at least a part of which is made of a conductor and can be energized. Both ends of the dust collecting part 100 may be opened and configured to freely flow or flow contaminants to be treated (which may be gas containing particles). Both ends of the dust collecting unit 100 may be connected to the pipeline, and the dust collecting unit 100 may be inserted into the pipeline to treat pollutants in the pipeline. The dust collecting unit 100 may be grounded to maintain a zero potential or a reference potential.

The dust collecting part 100 may be made entirely of a conductor such as a metal or the like, but a part of the dust collecting part 100 may be formed of a conductor so that the pollutant can easily be collected if necessary. For example, the dust collecting unit 100 can be manufactured by forming a polymer material such as acrylic into a cylindrical shape and forming a coating layer (see 110 in FIG. 1 and FIG. 2) made of metal such as aluminum on the inner surface of the cylinder. Or the conductive fluid such as water may continuously flow on the inner surface of the cylinder or the like to form the dust collecting part 100, at least a part of which is a conductor. The dust collecting part 100 may be manufactured in various forms, some or all of which are conductors.

The discharge unit 200 is separated from the dust collecting unit 100. At least a part of the discharge unit 200 may be made of a conductor, but it is preferable that the discharge unit 200 is made entirely of a conductor in order to induce discharge more smoothly. The discharge unit 200 may be formed in a hollow bar shape having a passage (see 210 in FIG. 1) formed therein, and may be inserted into the hollow dust collecting unit 100 while being spaced apart from the dust collecting unit 100. The discharge unit 200 can be fabricated by processing, for example, a copper tube or the like.

The flow path 210 may extend along the longitudinal direction of the discharge part 200 inside the discharge part 200. [ The discharging part 200 formed in a hollow bar shape can function as the flow path 210 as a whole of the inner space. The length and the width of the flow path 210 and the like can be appropriately changed depending on the formation method of the discharge part 200 and the necessity. 1 and 2, the flow path 210 is connected to an opening 220 that extends to the inside of the discharge unit 200 and opens to the surface of the discharge unit 200. [

The opening 220 may be formed by penetrating the surface of the discharge unit 200. The opening 220 is connected to the flow path 210 in the discharge unit 200 and discharges the conductive fluid supplied through the flow path 210 to the outside of the discharge unit 200. When an electric force is applied, the conductive fluid is split by the electric force and is sprayed from the opening portion 220 in the form of droplets. The openings 220 may be formed as a plurality as shown in FIGS. 1 and 2, and at least a part thereof may be opened in different directions.

A plurality of openings 220 may be formed and at least a part of the openings 220 may be opened on the surface of the discharge part 200 so as to face different directions toward the inner circumferential surface of the dust collecting part 100 . Accordingly, the conductive fluid can be uniformly injected into different spaces between the discharge unit 200 and the dust collecting unit 100. For example, the openings 220 may be formed of a plurality of different rows arranged along the longitudinal direction of the discharge unit 200 at different points on the surface of the discharge unit 200. The diameter of the opening 220 is preferably 0.5 mm or less, and if the size is too small, the opening 220 may be formed within a diameter range of 0.25 to 0.5 mm, .

The dust collecting part 100 and the discharging part 200 may extend in the gravity direction (direction from the upper side to the lower side in the drawing) as shown in Figs. A processing space 101 is formed between the dust collecting part 100 and the discharging part 200 inside the dust collecting part 100 to allow the contaminants to be treated to flow into the processing space 101 and be easily processed. The object to be treated (which may be a gas containing particles) may be processed while passing through the processing space 101 in the direction opposite to the direction of gravity, and the conductive fluid may be introduced into the processing space between the dust collecting unit 100 and the discharging unit 200 101). Accordingly, the direction in which the conductive fluid flows after reaching the dust collecting part 100 and the direction in which the object to be treated flows may be opposite to each other. The treatment of pollutants will be described in more detail below.

The fluid injection unit 300 (see FIG. 2) injects the conductive fluid into the flow path 210 inside the discharge unit 200, and discharges the conductive fluid to the opening 220 on the surface of the discharge unit 200. The fluid injection unit 300 may be connected to the discharge unit 200 through a conduit such as an injection tube 310 as shown in FIGS. Also, the channel may be connected to the discharge unit 200 by the connection unit 311, and the connection unit 311 may be made of the insulator. The fluid injecting unit 300 may include a pump capable of transporting the fluid, a water tank or tank for storing and supplying the fluid, a valve for opening and closing the pipe, and the like, . The fluid injecting unit 300 may be formed in various ways to easily inject the fluid into the discharge unit 200 and adjust the injection amount.

6), and a fluid pump (see 300b in Fig. 6) for transporting the conductive fluid to the water tank, at least a part of the conductive fluid stored and stored as the conductive fluid is supplied to the flow path 210, The fluid injection unit 300 can be formed in a manner including the fluid injection unit 300 and the like. So that the conductive fluid can be naturally injected into the flow path 210 of the discharge unit 200 without continuously operating the pump or the like. The electrostatic precipitator 1 may include a fluid recovery unit that recovers the conductive fluid discharged to the opening 220 so that at least a portion of the recovered conductive fluid is recycled to the fluid injection unit 300. This allows the conductive fluid to flow more efficiently and participate in the treatment of contaminants. This will be described in more detail in the following Experimental Examples.

The conductive fluid that is injected into the flow path 210 and discharged into the opening 220 and injected may be a liquid as a conductive fluid. Preferably, water may be used as the conductive fluid. However, the conductive fluid need not be limited to pure water and may be used as a conductive fluid by mixing one or more electrically conductive fluids that are not water or water, if necessary. It is also possible to use an additive mixed with the conductive fluid.

The power supply unit 400 applies a voltage to the discharge unit 200 to form an electric field. The power supply unit 400 may be formed of a high voltage generating device capable of generating a high voltage of several thousand volts or more and may be formed so that the applied voltage can be changed in response to a user's operation or control. The power supply unit 400 may apply a negative or positive voltage to the discharge unit 200 to form a corresponding electric field between the discharge unit 200 and the dust collection unit 100. Preferably, the power supply unit 400 applies a negative voltage to the discharge unit 200 to form an electric field and induce a negative corona discharge.

2, the electrostatic precipitator 1 may include a controller 500 for controlling the operations of the fluid injector 300 and the power source 400. The controller 500 may be formed of a programmable electronic controller or the like, and may control the pump by operating a control signal, opening or closing an electromagnetic valve formed in the conduit, or driving the power supply. The operation of the electric dust collector 1 to which the voltage is applied to the discharge part 200 can be more conveniently controlled by injecting the fluid into the flow path 210 inside the discharge part 200 using the control part 500 have. The control unit 500 may be operated automatically or may be operated by a user to change the operation.

For example, when the operation signal of any one of the power supply unit 400 and the fluid injection unit 300 is inputted first, the control unit 500 transmits a control signal (see S1 and S2 in FIG. 4) 400 and the fluid injection unit 300 can be synchronized. The fluid may be injected into the flow path 210 and the voltage may be applied to the discharge unit 200 in parallel. The control unit 500 controls the performance of the electrostatic precipitator 1 in such a manner that if one of the power supply amount of the power supply unit 400 and the fluid supply amount of the fluid injection unit 300 is changed, You can also keep it right. In addition, it is possible to control the operation of the power supply unit 400 and the fluid injecting unit 300 and smoothly operate the apparatus by variously changing the control method of the control unit 500.

The control unit 500 can change the input program or directly change the control method by the user's operation, so that the control unit 500 can operate in response to the long-time operation or the temporary operation of the apparatus. In addition, it is also possible to change the control method of the control unit 500 in a manner different from that exemplified by the type of equipment to which the apparatus is applied, the specific installation environment, and the like. However, the control unit 500 is not necessarily required, and the electric dust collecting apparatus 1 can be configured without the control unit 500 if necessary.

Hereinafter, the operation of the discharge unit and the operation of the electrostatic precipitator will be described in detail with reference to FIGS. 3 and 4. FIG.

FIG. 3 is an operational view of the discharge unit of the electrostatic precipitator of FIG. 1, and FIG. 4 is a view illustrating an operation of the electrostatic precipitator of FIG. 3 (a) shows a state in which no voltage is applied to the discharge unit, and Fig. 3 (b) shows a state in which a voltage is applied to the discharge unit.

The discharger 200 can discharge and discharge the conductive fluid A as shown in Fig. When the conductive fluid A is supplied through the injection tube 310, the conductive fluid A is injected into the discharge part 200 connected to the injection tube 310. That is, the conductive fluid A is injected into the flow path 210 in the discharge part 200 and discharged to the outside of the discharge part 200 through the opening part 220 connected to the flow path 210. 3 (a), when no voltage is applied to the discharge unit 200, the conductive fluid A is discharged to the opening 220 but is not injected, and is refracted in the direction of gravity and flows.

On the other hand, when a high voltage is applied to the discharge unit 200, a potential difference is induced between the discharge unit 200 and the dust collection unit (refer to 100 in FIG. 1 and FIG. 2), and a corresponding electric field is formed. Therefore, as shown in Fig. 3 (b), the conductive fluid A is cleaved and atomized in the form of fine droplets from the opening portion 220 by an electric force. At this time, a particularly strong corona discharge (B) is formed around the droplet adjacent to the discharge part 200 where the electric force is concentrated, so that contaminant particles having a small particle diameter such as fine dust can be easily charged. That is, the same effect as that of the discharge portion 200 is obtained by the conductive fluid A sprayed in the droplet form from the discharge portion 200, A three-dimensional corona discharge B that is widely extended to the outside of the discharge unit 200 in the region adjacent to the discharge cell 200 can be generated. This corona discharge B may be a streamer corona discharge including a streamer generated along the path in which the conductive fluid A is sprayed.

The conductive fluid A is sprayed in the form of a droplet and loses its velocity in the process of scattering and the distance between the droplets can be increased and the electric field is relatively concentrated around the discharge unit 200, But is not formed in the entire region where the conductive fluid A is sprayed. The corona discharge B may be formed in a shape extending in the periphery of the conductive fluid A sprayed in the form of a droplet as shown in an enlarged form only in a certain region around the discharge portion 200 side.

By using this, as shown in Fig. 4, the object C to be treated can be very effectively captured and processed. The object to be treated C can pass through the dust collecting part 100 from the lower part toward the upper part in the direction opposite to the gravity and the processing space C formed between the discharging part 200 inside the dust collecting part 100 and the dust collecting part 100, (101) and can be collected in the dust collecting part (100). Particularly, the conductive fluid A injected into the process space 101 and the corona discharge B extending around the discharge part 200 along the conductive fluid A are used to reduce contaminants such as fine dust particles The particles can be very easily collected and treated.

The conductive fluid A can be dispersed in a fine droplet form by the electric force and can reach the inner peripheral surface of the dust collecting part 100 while scattering. Therefore, fine contaminant particles can be easily treated not only by electric force but also by physical contact between particles and collision process. That is, the electric dust collecting apparatus 1 is configured to perform the electric power between the dust collecting unit 100 and the discharging unit 200, the electric force of the charged particles, the diffusion, collision and blocking between the particles distributed between the dust collecting unit 100 and the discharging unit 200 Etc. can be used to effectively treat contaminant particles such as fine dust.

The conductive fluid A arriving at the inner surface of the dust collecting unit 100 via the processing space 101 can be cleaned while the dust collecting unit 100 is being cleaned while flowing in the gravity direction to keep the inner circumferential surface of the dust collecting unit 100 clean. Therefore, it is possible to prevent the dust collecting unit 100 from being contaminated and deteriorate in electrical characteristics, and to prevent the polluted particles or the like that have been collected from being separated from the dust collecting unit 100 and prevented from scattering again.

The fluid injection unit 300 and the power supply unit 400 may receive and operate the control signals s1 and s2 applied from the control unit 500 as described above. However, the present invention is not limited thereto, and it is also possible to manually control the fluid injector 300, the power source unit 400, and the like as needed. That is, the electric dust collector 1 can be efficiently operated by changing the control of the fluid injecting unit 300 and the power supply unit 400, if necessary. By using such an electric dust collecting apparatus 1, contaminants can be treated very cleanly and effectively.

Hereinafter, the dust collecting method will be described in detail.

The description of the dust collecting method proceeds on the basis of the flowchart of Fig. 5, referring to the drawings of Figs. 1 to 4 together.

A dust collecting method according to an embodiment of the present invention includes a discharging part including a dust collecting part, a flow path and an opening connected to the flow path as shown in Fig. 5), a fluid injecting part for injecting a conductive fluid into the flow path and discharging the conductive fluid to the opening part, (S100) of preparing an electric dust collecting apparatus including a power supply unit for applying an electric voltage to a discharge unit to form an electric field, and a step of injecting a conductive fluid into the flow path and applying a voltage (S200) (S300, S400) of generating and collecting a corona discharge around the droplet adjacent to the discharge part side between the discharge part and the dust collecting part.

The electric dust collecting apparatus is not limited as long as it includes a dust collecting unit, a discharging unit, a fluid injecting unit and a power supply unit, but the following description will mainly be made with reference to an electric dust collecting apparatus which is an embodiment of the present invention.

1, the discharge unit 200 may include a hollow bar-shaped discharger 200 inserted into the hollow dust collector 100. The hollow bar- The discharge unit 200 may be formed by forming a flow path 210 inside and opening the opening 220 connected to the flow path 210 on the surface of the discharge unit 200. The dust collecting unit 100 is shown in a cylindrical shape, A plate shape, or the like. In the case of a dust collecting part such as a plate shape, the inside means the discharging part side. The dust collecting unit 100 and the discharging unit 200 may be made of at least a part of a conductor.

The fluid injection unit 300 may be connected to the flow path 210 of the discharge unit 200 through an injection tube (see 310 in FIG. 1 and FIG. 2). The fluid injection unit 300 may include a pump capable of fluid transportation, a water tank or tank for storing and supplying the fluid, a valve for opening and closing the fluid channel, and the like. The power supply unit 400 may include a high voltage generator . The power supply unit 400 may be electrically connected to the discharge unit 200 and the dust collecting unit 100 may be grounded.

The electrostatic precipitator 1 thus prepared is driven to inject a conductive fluid into the flow path 210 and apply an electric voltage to form an electric field. As described above, the fluid injecting unit 300 can be operated by utilizing the control unit (see 500 in FIG. 2) or manually operated to inject the conductive fluid into the flow path 210 of the discharge unit 200 have. The injected conductive fluid is discharged to the opening 220 connected to the flow path 210.

Also, the power unit 400 can be operated by using the control unit 500 or manually operating it. Electric power is supplied to the power supply unit 400 so that a negative or positive high voltage is applied to the discharge unit 200 so that an electric field can be formed between the discharge unit 200 and the dust collection unit 100. The conductive fluid is sprayed in the form of droplets from the opening portion 220 by the electric force and a corona discharge is generated around the droplet adjacent to the discharge portion 200 side between the discharge portion 200 and the dust collecting portion 100.

The corona discharge can be formed in a form that is widely extended to the outside of the discharge unit 200 in the region adjacent to the discharge unit 200 side in the region where the conductive fluid droplet is distributed as described above. This corona discharge may be a streamer corona discharge comprising a streamer generated along the path through which the conductive fluid is sprayed. The pollutant particles can be easily charged.

Particularly, in order to more effectively treat contaminant particles as fine particles, it is possible to change the magnitude of the voltage applied to the discharge unit 200 and adjust the intensity of the electric field. The voltage to be applied to the discharge unit 200 may form an electric field having an intensity of -3.5 to -4.5 kV / cm. Accordingly, the object to be collected by the dust collecting unit 100 is preferably a particle having a particle diameter of 0.01 to 10 μm , And more preferably a particle diameter of 0.14 to 1.30 mu m.

That is, by adjusting the strength of the electric field to the above range, it is possible to treat fine contaminant particles including fine particles having a particle diameter in the range of 0.14 to 1.30 μm with very high efficiency. The corona power ratio due to the corona discharge is preferably 1.75 to 35.3 W / (m 3 / min), more preferably 9.42 to 35.3 W / (m 3 / min). When the corona power ratio is less than or more than the above range, there is a possibility that the dust collecting efficiency may be reduced. Therefore, in order to perform the dust collecting method according to an embodiment of the present invention, an electric dust collector (see 1 in FIG. 1 and FIG. It is desirable to consider the above corona power ratio as a design parameter. This makes it possible to construct a device that can treat pollutants more efficiently. The relationship between the particle size range and the corona power ratio and the treatment efficiency will be described in more detail with reference to experimental examples to be described later.

Thus, when the conductive fluid is sprayed and the corona discharge is generated, the contaminant particles to be treated are very efficiently collected and processed in the processing space (see 101 in FIG. 4) between the dust collecting unit 100 and the discharge unit 200. At this time, as described above, the step of recovering the conductive fluid sprayed from the opening part 220 using the fluid recovery part and recirculating at least a part of the recovered conductive fluid to the fluid injection part 300 may be additionally performed (S500 ).

Such a process may last until the operation of the apparatus is stopped, and if it is judged that the processing is no longer needed, the operation of the apparatus may be stopped and the collection stopped. As a result, contaminant particles such as fine dust can be very effectively treated by a complex process not only of electric force but also physical contact between particles and collision process as described above. The conductive fluid sprayed in the form of a droplet reaches the dust collecting section 100 and cleans the dust collecting section 100, so that the inner circumferential surface of the dust collecting section 100 can be kept clean, and the scattering of the collected contaminants can be effectively prevented .

The description of the apparatus and method as described above can be applied equally to each other within the same category unless they are mutually contradictory.

Hereinafter, an experimental example of the present invention will be described.

Hereinafter, the wire electrode referred to in the graph is used as a dry dust collector, the water spray electrode Φ0.5 is used when the opening diameter is 0.5 mm, and the water spray electrode Ф0.25 is used when the opening diameter of the present example is 0.25 mm As shown in FIG.

6 is a configuration diagram of an experimental apparatus applied to an experimental example of the present invention.

FIG. 7 is a graph showing the concentration distribution of the contaminant particles generated according to particle size in an experimental example of the present invention. FIG. The particle size of the contaminant particles on the horizontal axis and the contaminant concentration {dM / dlog (dp)} in terms of the logarithmic scale are shown on the vertical axis.

8 is a graph showing a relationship between an applied voltage and an amount of current in an experimental example of the present invention. The applied voltage (Applied voltage) is shown on the horizontal axis and the amount of current (Current) is shown on the vertical axis.

9 is a photograph showing an actual state of a corona discharge according to an applied voltage in an experimental example of the present invention. The dry dust collector is represented by Dry, and the electrostatic precipitator of the present invention is represented by Wet.

10 is a graph showing the relationship between the electric field strength and the dust collection efficiency in an experimental example of the present invention. Electrical field strength is plotted on the horizontal axis and dust efficiency is shown on the vertical axis as a percentage.

11 is a graph showing the comparison between the inlet concentration of the contaminant particles and the concentration after the treatment for different electric field intensities in an experimental example of the present invention. Dm / dlog (dp)} of the pollutant particle on the horizontal axis and the log scale on the vertical axis, and the different electric field strengths (-4.5 kV / cm, - 3.5 kV / cm, -2.5 kV / cm) was compared with the concentration at the inlet before treatment.

FIG. 12 is a graph showing the relationship between the size of the contaminant particles and the dust collecting efficiency in comparison to different electric field intensities in an experimental example of the present invention. FIG. The horizontal axis represents the particle size of the contaminant particles and the vertical axis represents the efficiency in percent. The electric field strengths (-4.5 kV / cm, -3.5 kV / cm, -2.5 kV / cm).

13 is a graph showing the relationship between the corona power ratio and the dust collection efficiency of the present invention in an experimental example of the present invention. The corona power ratio (specific corona power) is plotted on the horizontal axis and the dust collection efficiency (efficiency) is shown on the vertical axis.

1. Configuration of experimental apparatus

The experimental apparatus was constructed as shown in Fig. The experimental apparatus mainly comprises dust collecting units 11, 12, 13 and 14 for generating contaminant particles (hereinafter referred to as dust), electrostatic precipitator 1 and measuring units 15, 16 and 17, The generated dust was supplied to the electrostatic precipitator. The electric dust collecting apparatus is substantially the same as the above-described electric dust collecting apparatus, and the same constituents are denoted by the same symbols to maintain continuity.

1.1 Dust Generator

Experimental dusts were generated by using hexamethyldisilazane ((CH ₃ ) ₃ SiNHSi (CH ₃ ) ₃ ), hereinafter referred to as HMDS) solution in the dust generating portions 11, 12, 13 and 14. The impinger 13 containing the HMDS solution was placed in the constant temperature water tank 12 at 30 ° C and the HMDS vapor was bubbled through the quartz tube at 700 L / Lt; 0 > C electric furnace 14 to generate particles. The precursors that enter the electric furnace in the steam state are oxidized to form stable oxides, and the oxides existing above the saturated vapor concentration undergo nucleation, condensation, and coagulation, Growth.

1.2 Electrostatic precipitator

The electrostatic precipitator includes a discharge unit 200 having flow paths and openings, a dust collecting unit 100, a fluid injecting unit including a water tank 300a and a fluid pump 300b, a high voltage generator HMP2500-50K-50mA-SR, Zipao , Korea), a storage tank 600, and a blower 700 for discharge. Water was used as the conductive fluid. The discharge unit 200 is made of copper and has a cylindrical shape with an outer diameter of 3 mm, an inner diameter of 1.6 mm, a thickness of 0.7 mm, and a length of 300 mm. On the surface of the discharge part, there were formed a total of 28 openings each having the same diameter in four directions at intervals of 40 mm, seven in each direction. The dust collecting part 100 is made of a cylindrical acrylic material and has an inner diameter of 110 mm and a length of 300 mm. The power supply unit 400 can apply negative (-) voltage up to -50 kV. The reservoir 600 is configured to recover the water falling from the dust collecting part and recycle it to the fluid injecting part to function as the above-described fluid recovering part.

1.3 Measurement section

The measurement units 15, 16, and 17 are largely composed of a portion for measuring the electrical element and a portion for measuring the dust concentration. To measure discharge current, connect a digital oscilloscope (TDS 2014B, Tektronix, USA) to a voltage probe (P2220, Tektronix, USA) and connect a 10kΩ resistor to the ground line connected to the dust collector to measure the voltage at ground And the current and power were calculated using the average of the three measured voltage values. The dust concentration was measured at the point where the flow at the back of the dust collector was stabilized. A round filter paper having a diameter of 47 mm was used to measure TPM (Total Particulate Matter). An in-stack cascade impactor (DLPI, Dekati, Finland) was used as the sampler (15) and a flow meter (16) was used to measure the flow rate of water supplied to the water tank.

2. Experimental Method

Electrical characteristics and dust collection efficiency were measured and compared with a dry dust collector using a water - free cylindrical discharge electrode. The dry dust collector was constructed so that the effect of using water was more clearly shown and contrasted with that of the experimental apparatus shown in FIG. 6, except that no water was used.

In addition, in order to compare the corona discharging characteristics and the dust collecting efficiency according to the diameter of the opening of the discharge unit 200, two openings having diameters of 0.25 mm and 0.5 mm were manufactured and replaced with each other. The applied voltage was -13.75 ~ -27.50 kV and the electric field strength was -2.5 ~ -5.0 kV / cm. The process gas flow rate was 1 m / sec and the flow rate was 0.57 m ³ / min. The characteristic dust collecting area and the corona power ratio according to these experimental conditions generally satisfy the range applicable to the electrostatic precipitator. (See Table 1 below)

Parameter This study Typical values
Gas velocity (m / sec)

1.0

0.6 - 1.8

Electrical field strength (kV / cm)

~ - 5.0
~ - 7.0
Specific corona power (W / (m 3 / min))

0 to 35
1.75 to 17.5

Specific collecting area (m ² / (m ³ / min))

0.18

0.25-2.1

3. Experimental Results

3.1 Confirmation of conformity of experimental dust

The average concentration of experimental dust generated from the dust generator was 21.5 mg / m ³ , and the deviation was 1.41. It is believed that this is similar to the concentration range emitted by the dust collectors with low dust collection efficiency in industrial facilities. Also, as shown in FIG. 7, the particle size distribution of generated dust is mostly in the range of 0.1 to 1 μm, and the particle size range is similar to the range in which the dust collection efficiency is low in the electrostatic precipitator and the ordinary dust collector. Therefore, it is considered that the particle size distribution is suitable for this experiment.

3.2 Corona discharge is clear even when the applied voltage is relatively low.

8 is a graph showing the amount of current according to an applied voltage. The dry dust collector started to generate corona discharge from the applied voltage of -20 kV, and the amount of current increased as the applied voltage increased. In the electrostatic precipitator of this experimental example, a larger amount of current was measured at the same applied voltage and increased sharply as the applied voltage was increased. Spark over phenomenon occurred when the applied voltage was -30kV. Also, a somewhat higher amount of current was measured when the diameter of the opening was 0.25 mm than 0.5 mm. The corona discharge photograph according to the applied voltage is shown in Fig. In both the dry dust collector (see FIG. 9) and the electric dust collector (see Wet in FIG. 9) of this experimental example, the appearance of the corona discharge became clear as the applied voltage was increased. Particularly, It can be confirmed that light is emitted in the water spray region around the discharge portion even at a relatively low applied voltage.

3.3 Improvement of dust collecting efficiency in the same electric field

Fig. 10 shows the dust collecting efficiency according to the electric field strength. Both the dry dust collector and the electric dust collector of this experimental example increased the dust collecting efficiency as the electric field strength increased. The efficiencies of the dry dust collector were 23.4%, 37.2%, 50.8%, 58.6%, 67.6% and 73.4% respectively when the electric field intensities were -2.5, -3.0, -3.5, -4.0, -4.5 and -5.0kV / Respectively.

On the other hand, the electrostatic precipitator of this experimental example showed 52.1%, 60.9%, 86.0%, 91.2%, 92.5% and 95.0% when the opening size was 0.5 mm, 56.6%, 68.0%, 89.7% and 93.3% , 94.3% and 95.7%, respectively. It can be seen that the dust collecting efficiency of the electric dust collector of the present experimental example is higher than that of the dry dust collector at the same electric field strength. In addition, the dust collection efficiency was somewhat higher when the diameter of the opening of the discharge part was 0.25 mm than when it was 0.5 mm.

3.4 Improvement of dust collection efficiency due to change of electric field strength

11 is a graph showing the particle diameter distribution after collecting dust particles when the inlet concentration and the electric field intensity are -2.5, -3.5, and -4.5 kV / cm, respectively, when the discharge portion having the diameter of 0.25 mm is used. Is a graph showing dust collection efficiencies for different particle diameters with respect to different electric field intensities. It is generally known that most of the dust collecting apparatuses exhibit a relatively low dust collecting efficiency in a particle diameter distribution region of 0.1 to 1.0 μm, which is a crossing region of the inertia force and the diffusing force.

In the case of the electric dust collecting apparatus of this experimental example, the dust collecting efficiencies of dust particle diameters were tested when the electric field intensities were -2.5, -3.5, and -4.5 kV / cm. When the dust particle size was in the range of 0.14 to 1.30 μm The collecting efficiency was significantly improved when the electric field intensity was -3.5 kV / cm to -4.5 kV / cm than when the electric field intensity was -2.5 kV / cm. In the case of -4.5kV / cm, the dust collection efficiency was improved by about 40% from -2.5kV / cm, and the overall dust collection efficiency was more than 95%. As shown in Table 1, the specific collecting area of this experimental example is 0.18 m ² / (m ³ / min), which means that the dust collecting efficiency is achieved at a non-dust collecting area lower than the normal range.

From these results, it can be seen that the dust particles having a relatively small particle size can be effectively collected by the present invention.

Diffusion, collision, blocking and the like can all be considered for dust collection in the particle diameter distribution region of 0.05 to 1.0 탆. The efficiency of dust collection due to diffusion and blocking is small, and when the number of droplets is large, the dust collecting efficiency is high. It is generally known that the smaller the size of the droplet is, the larger the dust collection efficiency is. Therefore, in the case of the electrostatic precipitator of this experimental example, it is considered that the dust collecting efficiency is increased by applying a high voltage to the water and spraying it with a smaller droplet size. In addition, as the droplet sprayed becomes smaller, the amount of the droplet to be charged increases. It is also considered that the efficiency of collecting the droplet is improved by the electrical agglomeration with the charged droplet.

3.5 Improvement of dust collection efficiency when the corona power ratio is relatively high

13 shows the relationship between the corona power ratio and the dust collecting efficiency. The corona power ratio (P / Q) is typically in the range of 1.75 to 17.5 W / (m ³ / min) and is an important factor in electrostatic precipitator design, providing important information on power consumption. As shown in the figure, when the corona power ratio is low, the treatment efficiency of the dry dust collector may be high, but in the corona power ratio within the range of 9.42 to 35.3 W / (m ³ / min) It can be judged that it is more suitable because it shows high efficiency. Considering that the non-dust-collecting area of this experiment was 0.18 m ² / (m ³ / min) and lower than the normal range, it was found that even with a relatively low dust- And thus it is possible to treat pollutants very efficiently.

From these results and the cleaning effect described above, it can be seen that the object to be treated such as fine dust can be treated more cleanly and effectively by the electric dust collector and the dust collecting method according to the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken in conjunction with the present invention. You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1: Electrostatic precipitator 11: Flow controller
12: constant temperature water tank 13: impinger
14: electric furnace 15: sampler
16: Flow meter 17: Oscilloscope
100: dust collecting part 101: processing space
110: coating layer 200: discharging part
210: passage 220: opening
300: fluid injection unit 300a:
300b: fluid pump 310: injection tube
311: connection part 400: power part
500: control unit 600: storage tank
700: blower
A: Conductive fluid B: Corona discharge
C: To be processed

Claims

A dust collecting part at least partially made of a conductor;
A discharge part spaced apart from the dust collecting part and at least a part of which is made of a conductor;
A flow path formed inside the discharge part;
An opening connected to the flow path and opened to the surface of the discharge part;
A fluid injecting part injecting a conductive fluid into the flow path and discharging the conductive fluid to the opening part; And
And a power unit for applying an electric voltage to the discharge unit to form an electric field,
Wherein the conductive fluid is sprayed in the form of droplets from the opening portion by an electric force and a corona discharge is generated around the droplet adjacent to the discharge portion side between the discharge portion and the dust collecting portion,
The dust collecting part is formed in a hollow shape,
Wherein the discharge portion is formed in a hollow bar shape separated from the dust collecting portion and inserted into the dust collecting portion,
Wherein the openings are formed in a plurality of openings so that at least a part of the openings are opened in different directions toward the inner circumferential surface of the dust collecting portion on the surface of the discharge portion.

The method according to claim 1,
Wherein the corona discharge comprises a streamer corona discharge.

The method according to claim 1,
Wherein the fluid injecting portion includes a water tank in which the conductive fluid is stored and at least a part of the conductive fluid is supplied to the flow path, and a fluid pump for transporting the conductive fluid to the water tank.

The method according to claim 1,
Further comprising a fluid recovery unit for recovering the conductive fluid discharged to the opening, wherein at least a part of the recovered conductive fluid is recirculated to the fluid injection unit.

The method according to claim 1,
And a control unit for controlling operations of the fluid injecting unit and the power source unit.

6. The method of claim 5,
Wherein the control unit sends a control signal to the other one when the operation signal of any one of the power supply unit and the fluid injection unit is input to synchronize the operation of the power supply unit and the fluid injection unit.

A dust collecting part at least partially made of a conductor;
A discharge part spaced apart from the dust collecting part and at least a part of which is made of a conductor;
A flow path formed inside the discharge part;
An opening connected to the flow path and opened to the surface of the discharge part;
A fluid injecting part injecting a conductive fluid into the flow path and discharging the conductive fluid to the opening part; And
And a power unit for applying an electric voltage to the discharge unit to form an electric field,
Wherein the conductive fluid is sprayed in the form of droplets from the opening portion by an electric force and a corona discharge is generated around the droplet adjacent to the discharge portion side between the discharge portion and the dust collecting portion,
Further comprising a control unit for controlling operations of the fluid injecting unit and the power source unit,
Wherein the controller changes the other one if the power supply amount of the power supply unit and the fluid supply amount of the fluid injection unit are changed.

delete

A dust collecting part at least partially made of a conductor;
A discharge part spaced apart from the dust collecting part and at least a part of which is made of a conductor;
A flow path formed inside the discharge part;
An opening connected to the flow path and opened to the surface of the discharge part;
A fluid injecting part injecting a conductive fluid into the flow path and discharging the conductive fluid to the opening part; And
And a power unit for applying an electric voltage to the discharge unit to form an electric field,
Wherein the conductive fluid is sprayed in the form of droplets from the opening portion by an electric force and a corona discharge is generated around the droplet adjacent to the discharge portion side between the discharge portion and the dust collecting portion,
The dust collecting part is formed in a hollow shape,
Wherein the discharge portion is formed in a hollow bar shape separated from the dust collecting portion and inserted into the dust collecting portion,
Wherein the dust collecting portion and the discharging portion extend in the gravity direction,
A processing space through which an object to be processed passes is formed between the dust collecting unit and the discharge unit in a direction opposite to the gravity direction,
Wherein the conductive fluid is sprayed into the processing space.

(a) a discharging portion including a dust collecting portion, a flow path and an opening portion connected to the flow path, a fluid injecting portion injecting a conductive fluid into the flow path and discharging the conductive fluid to the opening portion, and a power source Preparing an electrostatic precipitator including the electrostatic precipitator; And
(b) injecting the conductive fluid into the flow path, spraying the conductive fluid in the form of droplets from the opening, applying a voltage, and moving the liquid droplet around the droplet adjacent to the discharge part side between the discharge part and the dust- Generating and collecting a corona discharge,
Wherein the voltage forms an electric field having an intensity of -3.5 to -4.5 kV / cm.

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12. The method of claim 11,
Wherein the object to be collected in the step (b) is particles having a particle size of 0.14 to 1.30 占 퐉.

(a) a discharging portion including a dust collecting portion, a flow path and an opening portion connected to the flow path, a fluid injecting portion injecting a conductive fluid into the flow path and discharging the conductive fluid to the opening portion, and a power source Preparing an electrostatic precipitator including the electrostatic precipitator; And
(b) injecting the conductive fluid into the flow path, spraying the conductive fluid in the form of droplets from the opening, applying a voltage, and moving the liquid droplet around the droplet adjacent to the discharge part side between the discharge part and the dust- Generating and collecting a corona discharge,
Wherein the corona power ratio by the corona discharge is 9.42 to 35.3 W / (m3 / min).

12. The method of claim 11,
Collecting the conductive fluid sprayed from the opening of step (b), and recirculating at least a portion of the recovered conductive fluid to the fluid injection section.