KR20220106503A - Method for coarsening particulate matter, and precipitator using the same - Google Patents

Abstract

The present invention relates to a method for coarsening fine particles, and a dust collecting device using the same. The dust collecting device according to the embodiment includes: a first dust collecting unit which removes fine particles included in exhaust gas by using a DC power supply; a coarsening unit which coagulates specific fine particles not removed from the exhaust gas by the first dust collecting unit to coarsen the specific fine particles; and a second dust collecting unit which removes the coarsened specific fine particles using a DC power supply, wherein the coarsening unit coagulates the specific fine particles using an AC power supply. According to the present invention, removal efficiency of fine particles can be increased.

Description

Fine particle coarsening method, and dust collector using the same

The embodiment relates to a method for coarsening fine particles, and a dust collector using the same, and more particularly, to a technique for collecting fine particles included in exhaust gas using an electric field.

Exhaust gases emitted to the atmosphere from industrial facilities contain air pollutants such as sulfur oxides and nitrogen oxides. Such air pollutants include fine particles having a particle diameter of less than or equal to a certain value. Fine particles with a particle diameter of 10 [μm] or less are referred to as PM10, and fine particles having a particle diameter of 2.5 [μm] or less are referred to as PM2.5.

Meanwhile, in each industrial facility, appropriate environmental facilities are being operated to keep air pollutants below the permissible emission standards. One of them, the electrostatic precipitator, is a facility that electrically collects fine particles by passing exhaust gas through an electric field composed of a discharge electrode and a dust collecting electrode.

Specifically, when a high DC voltage is applied to the discharge electrode of the electrostatic precipitator, corona discharge occurs, and a large number of electrons move out of the corona region due to the electron avalanche generated in the discharge region, combine with gas molecules outside the corona region, and ionize the gas. . The ionized gas combines with the fine particles contained in the gas flow to electrically charge the fine particles, and the charged fine particles operate by a mechanism that is collected by the dust collecting pole by electric force.

According to the results of the analysis of fine dust emissions in the power generation sector conducted by the Korea Electric Power Research Institute, the constituent percentages of PM10 and PM2.5 in the exhaust gas emitted from the chimney of a coal-fired power plant are about 90 [%] and 79 [%], respectively, and the exhaust gas Fine particles occupy a significant proportion in However, the fine particle removal efficiency of the conventional electrostatic precipitator is as low as about 70 [%], so it is necessary to develop a dust collection technology capable of increasing the fine particle removal efficiency.

Republic of Korea Patent Publication No. 10-1953743

The embodiment is intended to overcome the above-described problems, and the method for coarsening fine particles according to the embodiment, and a dust collector using the same, increase the efficiency of removing fine particles by coarsening the fine particles using an alternating electric field. .

The technical problems to be achieved by the embodiment are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art from the description of the embodiment.

The embodiment is a dust collector, a first dust collecting unit for removing fine particles contained in exhaust gas using a DC power supply, and aggregating specific fine particles not removed from the first dust collecting unit in the exhaust gas to collect the specific fine particles a coarsening unit for coarsening, and a second dust collecting unit for removing the coarsened specific fine particles using DC power, wherein the coarsening unit may aggregate the specific fine particles using AC power.

In addition, the coarsening unit according to an embodiment may include a plurality of dust collecting poles to which the AC power is applied, and an alternating current electric field through which the specific fine particles pass may be formed between the plurality of dust collecting poles.

In addition, the plurality of fine particles constituting the specific fine particles according to the embodiment may be agglomerated by physically colliding with each other in the alternating current electric field.

In addition, the plurality of fine particles constituting the specific fine particles according to the embodiment may physically collide with each other due to a difference in vibration speed and amplitude according to each particle diameter.

In addition, in the plurality of fine particles constituting the specific fine particles according to the embodiment, relatively small fine particles may be aggregated into relatively large fine particles.

Also, the coarsening unit according to an embodiment may coarsen the specific fine particles to a predetermined size or more by adjusting the frequency of the AC power and the size of the AC power.

In addition, the predetermined size according to the embodiment may be 1 [㎛].

In addition, the frequency range of the AC power according to the embodiment may be 50 [Hz] to 60 [Hz].

In addition, the range of the size of the AC power according to the embodiment may be 10 [kV] to 35 [kV].

Also, the coarsening part according to an embodiment may be disposed at a rear end of the first dust collecting part.

An embodiment is a method for coarsening fine particles, in which the first dust collecting unit removes fine particles included in exhaust gas using a DC power source, and the coarsening unit provides specific fine particles not removed from the first dust collecting unit in the exhaust gas. aggregating the particles to coarsen the specific fine particles, and a second dust collecting unit, removing the coarsened specific fine particles using a direct current power source. In the coarsening step, the coarse The dialogue unit may aggregate the specific fine particles using AC power.

In addition, the coarsening unit according to an embodiment may include a plurality of dust collecting poles to which the AC power is applied, and an alternating current electric field through which the specific fine particles pass may be formed between the plurality of dust collecting poles.

In addition, the plurality of fine particles constituting the specific fine particles according to the embodiment may be agglomerated by physically colliding with each other in the alternating current electric field.

In addition, the plurality of fine particles constituting the specific fine particles according to the embodiment may physically collide with each other due to a difference in vibration speed and amplitude according to each particle diameter.

In addition, in the plurality of fine particles constituting the specific fine particles according to the embodiment, relatively small fine particles may be aggregated into relatively large fine particles.

In addition, in the coarsening step according to the embodiment, the coarsening unit may adjust the frequency of the AC power and the size of the AC power to coarsen the specific fine particles to a predetermined size or more.

In addition, the predetermined size according to the embodiment may be 1 [㎛].

In addition, the frequency range of the AC power according to the embodiment may be 50 [Hz] to 60 [Hz].

In addition, the range of the size of the AC power according to the embodiment may be 10 [kV] to 35 [kV].

Also, the coarsening part according to an embodiment may be disposed at a rear end of the first dust collecting part.

The fine particle coarsening method and the dust collector using the same according to the embodiment may increase the fine particle removal efficiency by coarsening the fine particles using an alternating electric field.

1 is a view showing the configuration of a dust collector according to an embodiment.
2 is a diagram schematically illustrating an operation process of the dust collector according to the embodiment.
3 is a diagram schematically illustrating a coarsening unit according to an embodiment.
4 is a flowchart illustrating a method for coarsening fine particles according to an embodiment.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar reference numerals are assigned to the same or similar components, and overlapping descriptions thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the embodiments; It should be understood to include equivalents and substitutes.

Terms including ordinal numbers such as first, second, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as “comprises” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, a dust collector 1000 according to an embodiment will be described with reference to FIGS. 1 to 3 .

1 is a diagram illustrating a configuration of a dust collector 1000 according to an embodiment.

2 is a diagram schematically illustrating an operation process of the dust collector 1000 according to the embodiment.

3 is a diagram schematically illustrating a coarsening unit 200 according to an embodiment.

Referring to FIG. 1 , the dust collecting apparatus 1000 may include a first dust collecting unit 100 , a coarsening unit 200 , and a second dust collecting unit 300 .

The first dust collecting unit 100 may remove fine particles included in the exhaust gas by using a DC power supply. Specifically, referring to FIG. 2 , the first dust collecting unit 100 may include a first discharge electrode 110 and a first dust collecting electrode 120 . The first discharge electrode 110 may generate a corona discharge by applying a DC high voltage by a DC power source. Also, the first dust collecting electrode 120 may collect electrically charged fine particles by electric force. The fine particles collected by the first dust collecting electrode 120 may be removed by a method such as lapping.

Fine particles not removed by the first dust collecting unit 100 may flow into the coarsening unit 200 from the first dust collecting unit 100 . That is, in the first dust collecting unit 100, only about 70 [%] of the fine particles included in the exhaust gas are removed, and the first dust collecting unit 100 removes the fine particles (about 30 [ of the fine particles included in the exhaust gas) %]) may be introduced into the coarsening unit 200 from the first dust collecting unit 100 . Here, the fine particles introduced into the coarsening unit 200 without being removed from the first dust collecting unit 100 are referred to as specific fine particles.

The coarsening unit 200 may coarsen the specific fine particles by aggregating the specific fine particles introduced from the first dust collecting unit 100 . Specifically, referring to FIG. 3 , the coarsening unit 200 may include a plurality of dust collecting poles 210 and 211 to which AC power is applied. The plurality of collecting poles 210 and 211 may be disposed in parallel to form an alternating electric field through which specific fine particles pass between the plurality of collecting poles 210 and 211 .

Referring back to FIG. 2 , in the alternating current electric field formed between the plurality of dust collecting poles 210 and 211 of the coarsening unit 200, a plurality of fine particles constituting a specific fine particle may physically collide with each other and aggregate. . Here, a plurality of fine particles constituting a specific fine particle may physically collide with each other due to a difference in vibration speed and amplitude according to each particle diameter. A plurality of fine particles constituting a specific fine particle may be coarsened by aggregating relatively small fine particles into relatively large fine particles as a result of physical collision.

On the other hand, the size of the specific fine particles coarsened in the coarsening unit 200 is preferably 1 [㎛] or more. The second dust collecting unit 300, which will be described later, removes fine particles by using a DC power supply, similarly to the first dust collecting unit 100. In the particle size range of 0.1 [㎛] or more and less than 1 [㎛], the removal efficiency of fine particles is relatively as low as Accordingly, the coarsening unit 200 may coarsen specific fine particles to a size of 1 [㎛] or more by adjusting the frequency of the AC power and the size of the AC power. Specifically, the coarsening unit 200 adjusts the range of the frequency of the AC power to 50 [Hz] to 60 [Hz], and the range of the magnitude of the AC power to 10 [kV] to 35 [kV], By coarsening the particles to a size of 1 [㎛] or more, it is possible to increase the removal efficiency of the fine particles.

Meanwhile, the reason that the coarsening unit 200 is disposed at the rear end of the first dust collecting unit 100 is as follows. When the coarsening unit 200 is disposed at the front end of the first dust collecting unit 100, a high concentration of exhaust gas without dust collection flows into the coarsening unit 200, so that the fine particle coarsening performance of the coarsening unit 200 is improved. hard to figure out In addition, when a plurality of dust collecting units are disposed at the front end of the coarsening unit 200, fine particles having a relatively small particle size are introduced into the coarsening unit 200. As the particle size of the fine particles is small, physical collision between the fine particles occurs. Since it is difficult, agglomeration between the fine particles is not sufficiently achieved. Accordingly, when the coarsening unit 200 is disposed at the rear end of the first dust collecting unit 100 , advantageous conditions for coarsening the fine particles are formed.

The second dust collecting unit 300 may remove specific fine particles coarsened in the coarsening unit 200 using DC power. Specifically, referring to FIG. 2 , the second dust collecting unit 300 may include a second discharge electrode 310 and a second dust collecting electrode 320 . The second discharge electrode 310 may generate a corona discharge by applying a DC high voltage by a DC power source. In addition, the second dust collecting electrode 320 may collect specific electrically charged fine particles by electric force. The specific fine particles collected by the second dust collecting electrode 320 may be removed by impact or the like.

Meanwhile, in the above, it has been described that the specific fine particles coarsened in the coarsening unit 200 are removed from the second dust collecting unit 300 , but the specific fine particles coarsened in the coarsening unit 200 are removed from at least one dust collecting unit. It should be understood that it can be That is, the coarsened specific fine particles may be removed in a single second dust collecting unit 300 or may be sequentially removed in a plurality of dust collecting units including the second dust collecting unit 300 .

Hereinafter, a method of coarsening fine particles according to an embodiment will be described with reference to FIG. 4 .

4 is a flowchart illustrating a method for coarsening fine particles according to an embodiment.

Referring to FIG. 4 , in step S100 , the first dust collecting unit 100 may remove fine particles included in the exhaust gas using DC power. Specifically, the first discharge electrode 110 of the first dust collecting unit 100 may generate a corona discharge by applying a DC high voltage by a DC power source. Also, the first dust collecting electrode 120 of the first dust collecting unit 100 may collect electrically charged fine particles by electric force. The fine particles collected by the first dust collecting electrode 120 may be removed by impact or the like.

In step S200 , the coarsening unit 200 may coarsen the specific fine particles by aggregating the specific fine particles introduced from the first dust collecting unit 100 . Specifically, in the AC electric field formed between the plurality of dust collecting poles 210 and 211 of the coarsening unit 200 , the plurality of fine particles constituting the specific fine particles may physically collide with each other and aggregate. Here, a plurality of fine particles constituting a specific fine particle may physically collide with each other due to a difference in vibration speed and amplitude according to each particle diameter. A plurality of fine particles constituting a specific fine particle may be coarsened by aggregating relatively small fine particles into relatively large fine particles as a result of physical collision.

On the other hand, the size of the specific fine particles coarsened in step (S200) is preferably 1 [㎛] or more. In the step (S300) to be described later, the second dust collecting unit 300 removes the fine particles using a DC power supply as in the step (S100), and in the particle size range of 0.1 [㎛] or more and less than 1 [㎛], the fine particles The removal efficiency is relatively low. Accordingly, in step S200 , the coarsening unit 200 may coarsen specific fine particles to a size of 1 [㎛] or more by adjusting the frequency of the AC power and the size of the AC power. Specifically, the coarsening unit 200 adjusts the range of the frequency of the AC power to 50 [Hz] to 60 [Hz], and the range of the magnitude of the AC power to 10 [kV] to 35 [kV], By coarsening the particles to a size of 1 [㎛] or more, it is possible to increase the removal efficiency of the fine particles.

In step (S300), the second dust collector 300 may remove the specific fine particles coarsened in step (S200) by using a DC power supply. Specifically, the second discharge electrode 310 of the second dust collecting unit 300 may generate a corona discharge by applying a DC high voltage from a DC power source. In addition, the second dust collecting electrode 320 of the second dust collecting unit 300 may collect specific electrically charged fine particles by electric force. The specific fine particles collected by the second dust collecting electrode 320 may be removed by impact or the like.

Although the embodiments have been described in detail above, the scope of the embodiments is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concepts of the embodiments defined in the claims below are also included in the scope of the embodiments.

Accordingly, the foregoing detailed description should not be construed as limiting in all respects but should be considered as illustrative. The scope of the embodiments should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the embodiments are included in the scope of the embodiments.

1000: dust collector
100: first dust collecting unit
110: first discharge electrode
120: first dust collecting pole
200: coarse painting
210, 211: a plurality of dust collecting poles
300: second dust collection unit
310: second discharge electrode
320: second dust collecting pole

Claims (20)

A first dust collecting unit for removing fine particles contained in exhaust gas by using a DC power supply;
a coarsening unit for coarsening the specific fine particles by aggregating specific fine particles that are not removed from the first dust collecting unit in the exhaust gas; and
A second dust collecting unit for removing the coarsened specific fine particles using a DC power supply
including,
The coarsening unit, a dust collector for agglomeration of the specific fine particles using an AC power source. According to claim 1,
The coarsening unit includes a plurality of dust collecting poles to which the AC power is applied,
An alternating current electric field through which the specific fine particles pass is formed between the plurality of dust collecting poles. 3. The method of claim 2,
A plurality of fine particles constituting the specific fine particles are aggregated by physically colliding with each other in the alternating current electric field. 4. The method of claim 3,
A plurality of fine particles constituting the specific fine particles physically collide with each other due to a difference in vibration speed and amplitude according to each particle diameter. 5. The method of claim 4,
In the plurality of fine particles constituting the specific fine particles, the fine particles having a relatively small size are aggregated into the fine particles having a relatively large size. 6. The method of claim 5,
The coarsening unit, by adjusting the frequency of the AC power and the size of the AC power, coarsening the specific fine particles to a predetermined size or more, the dust collector. 7. The method of claim 6,
The predetermined size is 1 [㎛], the dust collector. 8. The method of claim 7,
The range of the frequency of the AC power is 50 [Hz] to 60 [Hz], the dust collector. 9. The method of claim 8,
The range of the size of the AC power is 10 [kV] to 35 [kV], the dust collector. According to claim 1,
The coarsening unit is disposed at a rear end of the first dust collecting unit. removing, by the first dust collecting unit, fine particles contained in the exhaust gas using a DC power;
coarsening the specific fine particles by aggregating the specific fine particles that are not removed from the first dust collecting unit in the exhaust gas, and
removing, by the second dust collector, the coarsened specific fine particles using a DC power supply
including,
In the coarsening, the coarsening unit aggregates the specific fine particles using an AC power source. 12. The method of claim 11,
The coarsening unit includes a plurality of dust collecting poles to which the AC power is applied,
An alternating electric field through which the specific fine particles pass is formed between the plurality of dust collecting poles. 13. The method of claim 12,
A plurality of fine particles constituting the specific fine particles are agglomerated by physically colliding with each other in the alternating current electric field. 14. The method of claim 13,
A method of coarsening, wherein a plurality of fine particles constituting the specific fine particles physically collide with each other due to a difference in vibration speed and amplitude according to respective particle diameters. 15. The method of claim 14,
A method of coarsening, in the plurality of fine particles constituting the specific fine particles, in which relatively small fine particles are aggregated into relatively large fine particles. 16. The method of claim 15,
In the coarsening, the coarsening unit coarsens the specific fine particles to a predetermined size or more by adjusting the frequency of the AC power and the size of the AC power. 17. The method of claim 16,
The predetermined size is 1 [㎛], coarsening method. 18. The method of claim 17,
The range of the frequency of the AC power is 50 [Hz] to 60 [Hz], coarsening method. 19. The method of claim 18,
The range of the size of the AC power is 10 [kV] to 35 [kV], coarsening method. 12. The method of claim 11,
The coarsening method, wherein the coarsening part is disposed at a rear end of the first dust collecting part.

Images