KR20090044358A - Apparatus and method for purifying air pollutants - Google Patents

Apparatus and method for purifying air pollutants Download PDF

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Publication number
KR20090044358A
KR20090044358A KR1020070110433A KR20070110433A KR20090044358A KR 20090044358 A KR20090044358 A KR 20090044358A KR 1020070110433 A KR1020070110433 A KR 1020070110433A KR 20070110433 A KR20070110433 A KR 20070110433A KR 20090044358 A KR20090044358 A KR 20090044358A
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South Korea
Prior art keywords
exhaust gas
discharge
air pollutant
discharge device
cooling device
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KR1020070110433A
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Korean (ko)
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길창용
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(주) 동신메카텍
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Priority to KR1020070110433A priority Critical patent/KR20090044358A/en
Publication of KR20090044358A publication Critical patent/KR20090044358A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/818—Employing electrical discharges or the generation of a plasma

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  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)

Abstract

The present invention relates to an air pollutant treatment apparatus and a method for effectively removing air pollutants contained in exhaust gases emitted from industrial facilities such as thermal power plants, steel mills, and incinerators.

An apparatus for treating air pollutants in accordance with the present invention includes: a dust collecting apparatus for removing dust in exhaust gas; A first cooling device connected to the dust collecting device and cooling the exhaust gas to maintain a constant temperature of the exhaust gas from which dust is removed through the dust collecting device; A plasma discharge device which is connected to the first cooling device, decomposes and removes an air pollutant in the exhaust gas by maintaining a constant temperature through the first cooling device and plasma discharged the exhaust gas; A second cooling device connected to the plasma discharge device and cooling the exhaust gas so that the exhaust gas passing through the plasma discharge device maintains a constant temperature; And a corona discharge device connected to the second cooling device to maintain a constant temperature through the second cooling device, and to decompose and remove the air pollutants remaining in the exhaust gas by corona discharge of the incoming exhaust gas. And a control unit.

According to the present invention, it is possible to quickly and effectively remove the air pollutants in the exhaust gas discharged from industrial facilities such as thermal power plants, steel mills, incinerators.

Figure P1020070110433

Exhaust gas, air pollutant, dust collector, cooling, plasma, corona, discharge

Description

Apparatus and Method for Purifying Air Pollutants

The present invention relates to an air pollutant treatment apparatus and a treatment method, and more particularly, through a dust collecting step, a first cooling step, a plasma discharge step, a second cooling step and a corona discharge step sequentially, a thermal power plant and a steel mill. The present invention relates to an air pollutant treating apparatus and a method for effectively removing air pollutants such as sulfur dioxide, nitrogen oxide, and dioxins contained in exhaust gases emitted from industrial facilities such as gas and incinerators.

In general, exhaust gases emitted from industrial facilities such as fossil fuel-fired thermal power plants, steel mills, and incinerators contain harmful air pollutants such as sulfur dioxide (SO 2 ), nitrogen oxides (NOx), and dioxins. Industrial facilities, such as thermal power plants, steel mills, and incinerators, are equipped with exhaust gas treatment facilities for removing such air pollutants.

Currently, the most widely used technology for removing sulfur dioxide from exhaust gas is a wet lime / gypsum method using a limestone slurry, and a dry process using a dry absorbent and activated carbon is partially commercialized.

On the other hand, the nitrogen oxide removal method is to improve the combustion method of fossil fuel in order to suppress the generation of nitrogen oxide, or a denitrification method for treating the exhaust gas after combustion. Among these, the exhaust gas denitrification method may be divided into a wet method and a dry method depending on whether the nitrogen oxide is absorbed into the aqueous solution. Among these methods, the wet method is relatively inferior to the dry method because it is less economical than the dry method and requires the treatment of secondary pollutants such as water pollution. A typical commercialization process of the dry method is the selective catalytic reduction (SCR). The selective catalytic reduction method is a method of selectively reducing nitrogen oxides in the exhaust gas to nitrogen and water while simultaneously passing the exhaust gas and the reducing agent through the catalyst bed.

However, in the conventional air pollutant treatment method, as the pollutants are sequentially processed through two processes of desulfurization and denitrification, in which a large amount of exhaust gas is completely different in nature, the initial investment and operating costs increase, and the optimal process of desulfurization and denitrification processes. Not only is it required to be combined, but the waste water discharge from the wet method is pointed out as a problem.

Recently, in order to improve the problems in the conventional air pollutant treatment method, methods for removing air pollutants using plasma have been disclosed.

However, the conventional apparatuses and methods for treating air pollutants using plasma have a problem in that the overall configuration is too complicated and the manufacturing cost increases. There is a problem that does not effectively remove.

The present invention has been made to solve the above problems, the circular disk of the dust collector collects the dust in advance to remove the dust in the exhaust gas, air pollutants more quickly and effectively in the subsequent air pollutant removal process An object of the present invention is to provide an air pollutant treatment apparatus and a treatment method for removing the air pollutants.

Another object of the present invention is to use the principle of decomposing and removing air pollutants such as sulfur dioxide, nitrogen oxides and dioxins contained in exhaust gas by ions, radicals, and ozone generated during plasma discharge and corona discharge. It is an object of the present invention to provide an air pollutant treatment apparatus and a treatment method capable of rapidly removing a large amount of air pollutants in exhaust gas emitted from industrial facilities such as power plants, steel mills, and incinerators.

Another object of the present invention is to maintain the constant temperature of the exhaust gas to be purified immediately before the plasma discharge and the corona discharge, and discharge under optimum conditions, thereby efficiently removing the air pollutants in the exhaust gas. The present invention provides an apparatus for treating air pollutants and a method for treating the same.

In order to achieve the above object, the air pollutant treatment apparatus according to the present invention,

A dust collector which removes dust (dust) from exhaust gases emitted from industrial facilities such as thermal power plants, steel mills, and incinerators; A first cooling device connected to the dust collecting device and cooling the exhaust gas to maintain a constant temperature of the exhaust gas from which dust is removed through the dust collecting device;

A plasma discharge device which is connected to the first cooling device, decomposes and removes an air pollutant in the exhaust gas by maintaining a constant temperature through the first cooling device and plasma discharged the exhaust gas; A second cooling device connected to the plasma discharge device and cooling the exhaust gas so that the exhaust gas passing through the plasma discharge device maintains a constant temperature; And a corona discharge device connected to the second cooling device to maintain a constant temperature through the second cooling device, and to decompose and remove the air pollutants remaining in the exhaust gas by corona discharge of the incoming exhaust gas. And a control unit.

The dust collecting device, the first cooling device, the plasma discharge device, the second cooling device, and the corona discharge device may communicate with a connection pipe, and the connection pipe may be provided with a temperature sensor and a blower pump may be connected.

The dust collector, the first cooling device, the plasma discharge device, the second cooling device, the corona discharge device, the temperature sensor, and the blow pump are all controlled by a control unit which is a central control device. That is, the controller controls the first cooling device and the second cooling device based on the measurement data of the temperature sensor so that exhaust gas of a constant temperature flows into the plasma discharge device and the corona discharge device, and also controls the blower pump. It controls the flow rate of the exhaust gas and the power value supplied through.

A lower portion of the plasma discharge device and the corona discharge device may be provided with a sediment discharge pump for discharging the decomposed and collected air pollutants.

The dust collecting device includes a storage tank in which a cleaning liquid is contained, an exhaust gas inlet is formed at one side, and an exhaust gas outlet is formed at the other side; Shaft supports installed on both sides of the storage tank; A rotating shaft rotatably installed on the shaft support; A plurality of circular disks fixedly installed at predetermined intervals on the rotation axis; And a circular disk drive device for rotating the rotating shaft.

The storage tank may be provided with a cylinder for elevating the rotating shaft, an injection nozzle unit for spraying a cleaning liquid on the surface of the circular disk, a level control unit, and a brush for brushing the surface of each disk.

A collecting groove for collecting the cleaning liquid may be formed on the surface of the circular disk.

A spacing between the circular disks is maintained at 1 to 10 mm, and a guide part for guiding the flow of exhaust gas may be formed at an inner side surface of the storage tank adjacent to the exhaust gas outlet.

The plasma discharge device includes a chamber in which a predetermined space is formed; A cylindrical discharge electrode plate fixed in the chamber; A pair of transverse supports installed in the transverse direction at the top and bottom of the chamber; A rotational shaft rotatably installed in the longitudinal direction in the middle of the lateral support; A blowing fan fixed to the rotating shaft and rotated by exhaust gas flowing into the chamber; A pair of support frames positioned below the blowing fan and fixed to the rotation shaft by maintaining a predetermined distance from each other; It is installed in the longitudinal direction along the outer circumferential direction of the support frame, and has a plurality of discharge electrode rods installed in close proximity to the cylindrical discharge electrode plate.

Here, the lateral support, the rotation shaft, the support frame, the discharge electrode is all a conductor.

A needle is formed on a surface of the discharge electrode, and the needles of each discharge electrode are alternately arranged with the needles of adjacent discharge electrodes, and the cylindrical discharge electrode plate is formed with a plurality of slots. Bearings are provided between the rotating shafts.

A contaminant discharge hole through which contaminants of the exhaust gas removed by the plasma discharge may be formed in the lower portion of the chamber.

The corona discharge device, the chamber is formed inside the space; A cylindrical discharge electrode plate fixed in the chamber; A pair of transverse supports installed in the transverse direction at the top and bottom of the chamber; A rotational shaft rotatably installed in the longitudinal direction in the middle of the lateral support; A blowing fan fixed to the rotating shaft and rotated by exhaust gas flowing into the chamber; A pair of support frames positioned below the blowing fan and fixed to the rotation shaft by maintaining a predetermined distance from each other; And a plurality of discharge electrodes that are installed in a longitudinal direction along the outer circumferential direction of the support frame, are installed in close proximity to the cylindrical discharge electrode plate, and have needles on the surface thereof.

In addition, the present invention provides a method for treating air pollutants, the method for treating air pollutants according to the present invention comprises the first step of removing dust in the exhaust gas by introducing the exhaust gas into the dust collector; A second step of introducing the exhaust gas having passed through the first step into the first cooling device and cooling the exhaust gas so that the exhaust gas can be introduced into the plasma discharge device while maintaining the constant temperature; A third step of introducing the exhaust gas maintained at a constant temperature into the plasma discharge device through the second step and decomposing and removing the air pollutants in the exhaust gas by plasma discharge the introduced exhaust gas; Injecting the exhaust gas passed through the third step into the second cooling device, and cooling the exhaust gas so that the exhaust gas can be introduced into the corona discharge device while maintaining a constant temperature; And a fifth step of introducing the exhaust gas maintained at a constant temperature into the corona discharge device through the fourth step, and decomposing and removing the air pollutants remaining in the exhaust gas by corona discharge of the introduced exhaust gas. .

In the first step, dust in the exhaust gas is removed using a rotating disk and a cleaning liquid.

The temperature of the exhaust gas flowing into the plasma discharge device in the third step is preferably in the range of 5 to 10 ℃, the temperature of the exhaust gas flowing into the corona discharge device in the fifth step is -5 to 5 It is preferable to exist in the range of ° C.

In the third step, plasma discharge may be performed by applying AC power.

In addition, in the fifth step, a corona discharge may be performed by applying a DC power.

As described above, according to the present invention, the circular disk of the dust collector collects dust and removes dust in the exhaust gas in advance, so that air pollutants can be removed more quickly and effectively in a subsequent air pollutant removal process. have.

In addition, it is possible to rapidly remove a large amount of air pollutants such as sulfur dioxide, nitrogen oxides and dioxins contained in the exhaust gas by ions, radicals, and ozone generated during plasma discharge and corona discharge.

In addition, by performing the discharge in an optimized state of plasma discharge and corona discharge, it is possible to efficiently remove the air pollutants.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of an air pollutant treatment apparatus according to the present invention, Figure 2 is a longitudinal sectional view showing a dust collector according to the present invention, Figure 3 is a plan view showing a dust collector according to the present invention, Figure 4 Figure 5 is a side view showing a dust collector according to the present invention, Figure 5 is an exploded perspective view showing a plasma discharge device according to the present invention, Figure 6 is a longitudinal sectional view showing the interior of the plasma discharge device according to the invention, Figure 7 is the present invention Fig. 8 is a cross sectional view showing the interior of the plasma discharge device according to the present invention, and Fig. 8 is a longitudinal sectional view showing the interior of the corona discharge device according to the present invention.

1 to 8, the air pollutant treatment apparatus 1 according to the present invention includes a dust collector 110, a first cooling device 120, a plasma discharge device 130, a second cooling device 140, and The corona discharge device 150 is comprised.

Exhaust gases emitted from industrial facilities such as thermal power plants, steel mills, and incinerators are sequentially collected in a dust collector 110, a first cooling device 120, a plasma discharge device 130, a second cooling device 140, and a corona discharge device. Air pollutants in the exhaust gas are removed while passing through 150.

Referring to the configuration of the air pollutant treatment device 1 according to the present invention in more detail, first, the dust collector 110 is located at the very front of the air pollutant treatment device 1, such as a thermal power plant, steel mill, incinerator, etc. When the exhaust gas discharged from the industrial facility of the inlet into the dust collector 110, serves to remove the dust (dust) contained in the exhaust gas.

The first cooling device 120 in close proximity to the dust collector 110 is connected (communicated) with the dust collector 110 through a connection pipe P1.

The first cooling device 120 serves to cool the exhaust gas so that the exhaust gas from which dust is removed while passing through the dust collector 110 maintains a constant temperature and can be supplied to the plasma discharge device 130. .

The plasma discharge device 130, which is adjacent to the first cooling device 120, is connected to the first cooling device 120 through a connection pipe P2.

The plasma discharge device 130 is maintained at a constant temperature through the first cooling device 120 and serves to decompose and remove air pollutants in the exhaust gas by plasma discharge the incoming exhaust gas.

The second cooling device 140, which is adjacent to the plasma discharge device 130, is connected to the plasma discharge device 130 through a connection pipe P3.

The second cooling device 140 serves to cool the exhaust gas so that the exhaust gas passing through the plasma discharge device 130 may be supplied to the corona discharge device 150 while maintaining a constant temperature.

The corona discharge device 150 is connected to the second cooling device 140 through a connection pipe P4.

The corona discharge device 150 is maintained at a constant temperature through the second cooling device 140 and serves to decompose and remove the air pollutants remaining in the exhaust gas by corona discharge the incoming exhaust gas.

Each connection pipe P1-P4 of the dust collector 110, the first cooling device 120, the plasma discharge device 130, the second cooling device 140, and the corona discharge device 150 is provided in each connection pipe. Temperature sensors C1-C4 are provided.

Blowing pumps A1-A4 are connected to each of the connection pipes P1-P4, and the blow pumps A1-A4 serve to blow the exhaust gas to the next adjacent device.

The dust collecting device 110, the first cooling device 120, the plasma discharge device 130, the second cooling device 140, the corona discharge device 150, the blowing pump (A1-A4), The temperature sensors C1-C4 are all controlled by the controller 160, which is a central control device. That is, the controller 160 controls the first cooling device 120 and the second cooling device 140 based on the measurement data of the temperature sensors C1-C4 so that the exhaust gas having a constant temperature is discharged from the plasma discharge device ( 130 and the corona discharge device 150, and also controls the flow rate of the exhaust gas and the power value supplied through the control of the blower pumps (A1-A4).

In addition, the lower portion of the plasma discharge device 130 and the corona discharge device 150 may be provided with a pollutant discharge pump 170 for discharging air pollutants.

Hereinafter, the components of the air pollutant treatment apparatus according to the present invention will be described in more detail.

First, referring to FIGS. 2 to 4, the dust collecting apparatus 110 includes a cleaning liquid 111 contained therein, an exhaust gas inlet 112 is formed at one side, and an exhaust gas outlet 113 is formed at the other side. A tank 114 is provided.

Shaft supports 115 are provided on both sides of the storage tank 114, and a rotation shaft 115 is rotatably installed on the shaft supports 114.

A plurality of circular disks 116 are fixed to the rotation shaft 115 at regular intervals. Here, it is preferable that the interval t between each circular disk 116 is maintained at 1 to 10 mm.

One side of the storage tank 114 is provided with a circular disk drive device 117 for rotating the rotary shaft 115, the other side of the storage tank 114 is riding the rotary shaft 115 The cylinder 118 which lowers is provided.

The inside of the storage tank 114 sprays the cleaning liquid onto the surface of the circular disk 116 to drop the cleaning liquid buried on the surface of the circular disk, and to spray the cleaning liquid to an area not covered by the circular disk 116. The injection nozzle part 119 is provided.

The storage tank 114 may be provided with a water level control unit 114a for adjusting the level of the cleaning liquid 111 in the storage tank 114.

The storage tank 114 may be provided with a plurality of brushes (114b) for brushing the cleaning liquid and dust on the surface of each circular disk 116.

A collecting groove 116a for collecting the cleaning liquid may be formed on the surface of the circular disk 116, and the cleaning liquid collects and precipitates more dust by the collecting groove 116a.

A guide part 114c for guiding the flow of the exhaust gas may be formed at an inner side surface of the storage tank 114 adjacent to the exhaust gas outlet 113.

5 to 7, the plasma discharge device 120 includes a chamber 121 in which a predetermined space is added.

The cylindrical discharge electrode plate 122 is fixed in the chamber 121.

An upper lateral support 124a is installed at an upper portion of the chamber 121, and a lower lateral support 124b is provided at a lower portion of the chamber 121 in a lateral direction.

The rotation shaft 125 is rotatably installed in the longitudinal direction through the middle of the upper horizontal support 124a and the lower horizontal support 124b. Here, a bearing 124c is provided between the lateral supports 124a and 124b and the rotation shaft 125 to reduce friction between components.

The blowing fan 127 is fixedly installed on the rotation shaft 125, and the blowing fan 127 may be rotatably rotated by the exhaust gas flowing into the chamber 121.

An upper support frame 126a is installed below the blower fan 127, and a lower support frame 126b is fixed below the upper support frame 126a by maintaining a predetermined distance. It is installed.

A plurality of discharge electrodes 129 are fixed in the longitudinal direction along the outer circumferential direction of the upper and lower support frames 126a and 126b, and the discharge electrodes 129 are close to the cylindrical discharge electrode plate 122. It is installed. The needle 129a is formed on the surface of the discharge electrode 129. The needles 129a of the discharge electrode bars 129 are alternately or alternately arranged with the needles 129a of the adjacent discharge electrode bars 129.

The lateral supports 124a and 124b, the rotation shaft 125, the support frames 126a and 126b, and the discharge electrode 129 are all conductors.

A plurality of slots 122a are formed in the cylindrical discharge electrode plate 122. The slot 122a facilitates the flow of the exhaust gas and has an effect of plasma discharge to the outside of the cylindrical discharge electrode plate 122.

A contaminant discharge hole 121a through which contaminants of the exhaust gas removed by plasma discharge is discharged is formed below the chamber 121.

Meanwhile, referring to FIG. 8, the corona discharge device 150 includes a chamber 151 having a space formed therein; A cylindrical discharge electrode plate 152 fixed in the chamber 151; A pair of transverse supports 154a and 154b installed in the upper and lower portions of the chamber 151 in the transverse direction; A rotating shaft 155 rotatably installed in the longitudinal direction in the middle of the horizontal supports 154a and 154b; A blowing fan 157 fixed to the rotation shaft 155 and rotated by exhaust gas flowing into the chamber 151; A pair of support frames 156a and 156b positioned below the blower fan 157 and fixed to the rotation shaft 155 by maintaining a predetermined distance from each other; And a plurality of discharge electrodes that are installed in a longitudinal direction along the outer circumferential direction of the support frames 156a and 156b, are installed in close proximity to the cylindrical discharge electrode plate 152, and have needles 159a on the surface thereof. 159).

The needles 159a of the respective discharge electrode rods 159 are alternately or alternately arranged with the needles of the adjacent discharge electrode rods, and a plurality of slots 152a are formed in the cylindrical discharge electrode plate 152. A bearing 154c is provided between the horizontal support members 154a and 154b and the rotation shaft 155, and the lower part of the chamber 151 is polluted to discharge pollutants of the exhaust gas decomposed and removed by corona discharge. The material discharge hole 151a is formed.

On the other hand, Figure 9 is a process chart illustrating the air pollutant treatment method according to the present invention.

9, the air pollutant treatment method according to the present invention includes a first step (S 10) for removing dust in the exhaust gas by introducing the exhaust gas into the dust collector; A second step (S 20) of introducing the exhaust gas passed through the first step into the first cooling device and cooling the exhaust gas so that the exhaust gas is maintained at a constant temperature and flows into the plasma discharge device; A third step (S 30) of introducing the exhaust gas maintained at a constant temperature through the second step into the plasma discharge device and decomposing and removing the air pollutants in the exhaust gas by plasma discharge the introduced exhaust gas; A fourth step (S 40) of introducing the exhaust gas passed through the third step into the second cooling device and cooling the exhaust gas so that the exhaust gas can be introduced into the corona discharge device while maintaining a constant temperature; And a fifth step of introducing the exhaust gas maintained at a constant temperature into the corona discharge device through the fourth step, and decomposing and removing the air pollutants remaining in the exhaust gas by corona discharge of the introduced exhaust gas (S 50). It is made, including.

Hereinafter, the air pollutant treatment method according to the present invention will be described in more detail.

First, in the first step, the exhaust gas is introduced into the dust collector 110 to remove dust in the exhaust gas. That is, as shown in Figures 2 to 4, when the rotating shaft 114 is rotated by the circular disk drive device 117, a plurality of circular disk 116 is fixed to the rotating shaft 114, the whole Is rotated. At this time, the dust in the exhaust gas introduced into the storage tank 114 through the exhaust gas inlet 112 is collected in the cleaning liquid droplets buried on the surface of the circular disk 116. The cleaning liquid droplets in which the dust is collected are dropped while rotating with the circular disk 116 or in combination with neighboring cleaning liquid drops.

The exhaust gas from which dust is removed while passing through the dust collector 110 is blown by an air blow pump A1 installed in the connection pipe P1 between the dust collector 110 and the first cooling device 120 shown in FIG. 1. It is introduced into the first cooling device (120).

Next, in the second step, the dust is removed while passing through the dust collector 110 is introduced into the first cooling device 120 to maintain a constant temperature of the exhaust gas into the plasma discharge device 130 Cool the exhaust gas so that it can be introduced.

In this case, the controller 160 controls the first cooling device 120 based on the measurement data of the temperature sensor C2 installed in the connection pipe P2 between the first cooling device 120 and the plasma discharge device 130. The temperature of the exhaust gas introduced into the plasma discharge device 130 has a constant value. Maintaining a constant temperature of the exhaust gas introduced into the plasma discharge device 130 is to prevent the electrical resistance of the exhaust gas varies with temperature. That is, to keep the temperature constant so that the electrical resistance of the exhaust gas is constant. The temperature of the exhaust gas introduced into the plasma discharge device 130 is preferably controlled within the range of 5 to 10 ° C. in view of operating efficiency and removal efficiency of the exhaust gas.

Next, in the third step, the exhaust gas maintained at a constant temperature is introduced into the plasma discharge device 130 through the first cooling device 130, and the discharged exhaust gas is plasma discharged to atmosphere in the exhaust gas. Decompose and remove contaminants.

That is, when an appropriate power source is applied to the cylindrical discharge electrode plate 122 and the discharge electrode rod 129, plasma discharge occurs. For example, when an alternating current of 122khz (10kv 500mA) is applied, the exhaust gas passing through the plasma discharge device 130 is in a plasma state, and a large amount of ions, radicals, and ozone are generated. Air pollutants are decomposed and removed by the action of ozone.

Next, in the fourth step, the exhaust gas that has undergone the plasma discharge is introduced into the second cooling device 140, and the exhaust gas is introduced so that the exhaust gas can be introduced into the corona discharge device 150 while maintaining a constant temperature. Cool.

In this case, the controller 160 controls the second cooling device 140 based on the measurement data of the temperature sensor C4 installed in the connection pipe P4 between the second cooling device 140 and the corona discharge device 150. The temperature of the exhaust gas flowing into the corona discharge device 150 has a constant value. The constant temperature of the exhaust gas flowing into the corona discharge device 150 is to prevent the electrical resistance of the exhaust gas from changing according to the temperature. That is, to keep the temperature constant so that the electrical resistance of the exhaust gas is constant. The temperature of the exhaust gas flowing into the corona discharge device 150 is preferably controlled in the range of -5 to 5 ° C in view of operation efficiency and removal efficiency of the exhaust gas.

Finally, in the fifth step, the exhaust gas maintained at a constant temperature through the second cooling device 140 is introduced into the corona discharge device 150, and the atmosphere that remains in the exhaust gas by corona discharge the introduced exhaust gas. Decompose and remove contaminants.

That is, corona discharge occurs when an appropriate power source is applied to the cylindrical discharge electrode plate 152 and the discharge electrode rod 159. For example, when DC 20kV / 500mA is applied, a large amount of ions, radicals, and ozone are generated in the exhaust gas passing through the corona discharge device 150 by generating a corona discharge, and the atmosphere is caused by a chain collision of activated electrons and an action of ozone. Contaminants are broken down and removed.

That is, in the third and fifth stages, a large amount of oxidative radicals and ozone such as O, OH, and HO 2 are generated, and the following reaction formula shows a reaction scheme in which sulfur dioxide and nitrogen oxide are removed by their action.

Scheme 1: SO 2 + OH-> HSO 3

Scheme 2: HSO 3 + OH-> H 2 SO 4

Scheme 3: SO 2 + O-> SO 3

Scheme 4: SO 3 + H 2 O-> H 2 SO 4

Scheme 5: NO + O-> NO 2

Scheme 6: NO + HO 2- > NO 2 + OH

Scheme 7: NO + OH-> HNO 2

Scheme 8: HNO 2 + OH-> NO 2 + H 2 O

Scheme 9: NO + O 3- > NO 2 + O 2

Scheme 10: NO 2 + OH-> HNO 3

By the above process, air pollutants such as sulfur dioxide and nitrogen oxide can be removed quickly and safely.

1 is an overall configuration diagram of an air pollutant treatment apparatus according to the present invention.

2 is a longitudinal sectional view showing a dust collecting apparatus according to the present invention.

3 is a plan view showing a dust collector according to the present invention.

Figure 4 is a side view showing a dust collector according to the present invention.

5 is an exploded perspective view showing a plasma discharge device according to the present invention.

6 is a longitudinal sectional view showing the interior of the plasma discharge device according to the present invention.

7 is a cross-sectional view showing the interior of the plasma discharge device according to the present invention.

8 is a longitudinal sectional view showing the interior of the corona discharge device according to the present invention.

9 is a process chart illustrating an air pollutant treatment method according to the present invention.

* Drawing reference for the main part

110: dust collector

P1-P4: Connecting Pipe

C1-C4: Temperature Sensor

A1-A4: Blowing Pump

111: cleaning liquid

112: exhaust gas inlet

113 exhaust gas outlet

114: storage tank

114a: water level control unit

114b: Brush

114c: Guide part

115: shaft support

116: circular disk

116a: collection home

117: circular disk drive

118: cylinder

119: injection nozzle unit

120: first cooling device

121, 151: chamber

121a, 151a: Pollutant discharge hole

122, 152: discharge electrode plate

122a, 152a: slot

123, 153: power supply electrode

124a, 154a: Upper transverse support

124b, 154b: Lower Lateral Supports

124c, 154c: Bearing

125, 155: rotation axis

126a, 156a: upper support frame

126b, 156b: lower support frame

129 and 159: discharge electrode

129a, 159a: Spit

130: plasma discharge device

140: second cooling device

150: corona discharge device

160: control unit

170: pollutant discharge pump

Claims (27)

Dust collector to remove dust in the exhaust gas; A first cooling device connected to the dust collecting device and cooling the exhaust gas to maintain a constant temperature of the exhaust gas from which dust is removed through the dust collecting device; A plasma discharge device which is connected to the first cooling device, decomposes and removes an air pollutant in the exhaust gas by maintaining a constant temperature through the first cooling device and plasma discharged the exhaust gas; A second cooling device connected to the plasma discharge device and cooling the exhaust gas so that the exhaust gas passing through the plasma discharge device maintains a constant temperature; And A corona discharge device connected to the second cooling device to maintain a constant temperature through the second cooling device, and to decompose and remove the air pollutants remaining in the exhaust gas by corona discharge of the incoming exhaust gas; And Air pollutant treatment apparatus comprising a control unit. The method of claim 1, The dust collecting device, the first cooling device, the plasma discharge device, the second cooling device and the corona discharge device communicate with a connecting pipe, and the connection pipe is provided with a temperature sensor. Device. The method of claim 2, Air pollutant treatment apparatus characterized in that the blow pipe is connected to the connection pipe. The method of claim 1, The air pollutant treatment device further comprises an air pollutant discharge pump for discharging air pollutants below the plasma discharge device and the corona discharge device. The method of claim 1, The dust collector, A storage tank containing a cleaning solution therein, an exhaust gas inlet is formed at one side, and an exhaust gas outlet is formed at the other side; Shaft supports installed on both sides of the storage tank; A rotating shaft rotatably installed on the shaft support; A plurality of circular disks fixedly installed at predetermined intervals on the rotation axis; And Air pollutant treatment device comprising a circular disk drive for rotating the rotating shaft. The method of claim 5, At least one cylinder for raising and lowering the rotating shaft is provided on a side surface of the storage tank. The method of claim 5, The storage tank further comprises an injection nozzle unit for spraying the cleaning liquid. The method of claim 5, The storage tank further comprises a water level control unit. The method of claim 5, The storage tank further comprises a brush for brushing the surface of the plurality of circular disks. The method of claim 5, Air pollutant treatment apparatus, characterized in that the collecting groove for collecting the cleaning liquid is formed on the surface of the circular disk. The method of claim 5, The plurality of circular disks are air pollutant treatment apparatus, characterized in that fixed to the rotating shaft at intervals of 1 to 10mm. The method of claim 5, Air pollutant treatment apparatus, characterized in that the guide portion for guiding the flow of the exhaust gas is formed on the side of the upper side of the storage tank adjacent to the exhaust gas outlet. The method of claim 1, The plasma discharge device A chamber in which a predetermined space is formed; A cylindrical discharge electrode plate fixed in the chamber; A pair of transverse supports installed in the transverse direction at the top and bottom of the chamber; A rotational shaft rotatably installed in the longitudinal direction in the middle of the lateral support; A blowing fan fixed to the rotating shaft and rotated by exhaust gas flowing into the chamber; A pair of support frames positioned below the blowing fan and fixed to the rotation shaft by maintaining a predetermined distance from each other; It is installed in the longitudinal direction along the outer circumferential direction of the support frame, characterized in that it comprises a plurality of discharge electrode rods installed in close proximity to the cylindrical discharge electrode plate. The method of claim 13, And the transverse support, the rotation shaft, the support frame and the discharge electrode are conductors. The method of claim 13, The air pollutant treatment apparatus, characterized in that the needle is formed on the surface of the discharge electrode. The method of claim 15, The needles of each of the discharge electrodes are alternately arranged with the needles of the adjacent discharge electrode, air pollutant treatment apparatus, characterized in that arranged. The method of claim 13, Apparatus for treating air pollutants, characterized in that a plurality of slots are formed in the cylindrical discharge electrode plate. The method of claim 13, Air pollutant treatment apparatus, characterized in that the bearing is provided between the horizontal support and the rotating shaft. The method of claim 13 And a pollutant discharge hole through which a pollutant of the exhaust gas removed by plasma discharge is formed at a lower portion of the chamber. The method of claim 1, The corona discharge device, A chamber in which spaces are formed; A cylindrical discharge electrode plate fixed in the chamber; A pair of transverse supports installed in the transverse direction at the top and bottom of the chamber; A rotational shaft rotatably installed in the longitudinal direction in the middle of the lateral support; A blowing fan fixed to the rotating shaft and rotated by exhaust gas flowing into the chamber; A pair of support frames positioned below the blowing fan and fixed to the rotation shaft by maintaining a predetermined distance from each other; And It is installed in the longitudinal direction along the outer circumferential direction of the disc, the air pollutant processing apparatus, characterized in that it comprises a plurality of discharge electrode rods which are installed close to the cylindrical discharge electrode plate, the needle having a surface. The method of claim 20, The needles of each of the discharge electrodes are alternately arranged with the needles of the adjacent discharge electrodes, and the cylindrical discharge electrode plate is provided with a plurality of slots, and a bearing is provided between the lateral support and the rotating shaft, The air pollutant treatment apparatus, characterized in that the lower portion is formed with a pollutant discharge hole through which the pollutant of the exhaust gas removed by the plasma discharge is discharged. A first step of removing dust in the exhaust gas by introducing the exhaust gas into the dust collecting apparatus; A second step of introducing the exhaust gas having passed through the first step into the first cooling device and cooling the exhaust gas so that the exhaust gas can be introduced into the plasma discharge device while maintaining the constant temperature; A third step of introducing the exhaust gas maintained at a constant temperature into the plasma discharge device through the second step and decomposing and removing the air pollutants in the exhaust gas by plasma discharge the introduced exhaust gas; Injecting the exhaust gas passed through the third step into the second cooling device, and cooling the exhaust gas so that the exhaust gas can be introduced into the corona discharge device while maintaining a constant temperature; And And a fifth step of introducing the exhaust gas maintained at a constant temperature into the corona discharge device through the fourth step, and decomposing and removing the air pollutants remaining in the exhaust gas by corona discharge of the introduced exhaust gas. Air pollutant treatment method characterized in that. The method of claim 22, The first step is to remove the dust in the exhaust gas by using a rotating disk and the cleaning liquid of the air pollutant. The method of claim 22, In the third step, the temperature of the exhaust gas flowing into the plasma discharge device is characterized in that the range of 5 to 10 ℃ air pollutant treatment method. The method of claim 22, In the fifth step, the temperature of the exhaust gas flowing into the corona discharge device is characterized in that in the range of -5 to 5 ℃. The method of claim 22, In the third step, the plasma pollutant treatment method characterized in that the plasma discharge by applying an AC power. The method of claim 22, In the fifth step, the air pollutant treatment method characterized in that to perform a corona discharge by applying a DC power.
KR1020070110433A 2007-10-31 2007-10-31 Apparatus and method for purifying air pollutants KR20090044358A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114053847A (en) * 2021-11-15 2022-02-18 江苏中基复合材料有限公司 Device for treating tail gas based on corona of annealing furnace and treatment method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114053847A (en) * 2021-11-15 2022-02-18 江苏中基复合材料有限公司 Device for treating tail gas based on corona of annealing furnace and treatment method thereof
CN114053847B (en) * 2021-11-15 2024-03-29 江苏中基新能源科技集团有限公司 Device for corona treatment of tail gas based on annealing furnace and treatment method thereof

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