WO2019156282A1

WO2019156282A1 - Combination fine dust and nitrogen oxide removal device using pulse

Info

Publication number: WO2019156282A1
Application number: PCT/KR2018/002831
Authority: WO
Inventors: 권경남; 최태주; 권경우; 박영옥; 김광득; 나임하솔리; 전성민; 이강산; 이재랑
Original assignee: 주식회사와이티
Priority date: 2018-02-09
Filing date: 2018-03-09
Publication date: 2019-08-15
Also published as: KR101896948B1

Abstract

A combination fine dust and nitrogen oxide removal device comprises: a dust collection unit including an electric dust collection part for charging and collecting fine dust in an exhaust gas and a dust collection filter part for filtering fine dust which has not been collected by the electric dust collection part or fine dust which has been re-scattered in the electric dust collection part; a dust removal unit for applying pulses to the electric dust collection part and the dust collection filter part to drop the fine dust collected by the electric dust collection part or filtered by the dust collection filter part; a mixing unit for mixing a reducing agent with the exhaust gas that has passed through the dust collection unit; and a reducing unit for selectively reducing and removing nitrogen oxides from the exhaust gas mixed with the reducing agent.

Description

Combined fine dust and nitrogen oxide removal device using pulse

The present invention relates to a combination type dust and nitrogen oxide removal device, and more particularly to the combined fine dust and nitrogen oxide using a pulse to remove the fine dust and nitrogen oxides are introduced using a pulse to have an electrostatic force more efficiently. Relates to a removal device.

Fine dust among representative air pollutants has a particle size range of 0.1 ~ 10㎛, mainly fossil fuel combustion, power plant, waste incineration process, blast furnace and arcon of steel making process, heat treatment facility, petroleum refining and petrochemical product manufacturing process. It is becoming.

In order to remove fine dust particles and nitrogen oxides discharged from such industrial processes, methods such as an electrostatic precipitator, a bag filter, and a selective catalytic reduction (SCR) are used.

In the case of the electrostatic precipitator, the electrostatic principle by the corona discharge is used, and the initial installation cost and the operation cost are high, and since the electric resistance is affected by the type of dust particles, there is a need to cope with this.

In the case of the bag filter, when dust is accumulated in the filter, it is necessary to remove the dust by physical impact, which may damage or reduce the efficiency of the filter and require additional equipment or additional cost to remove the dust. If the concentration is high or the filtration speed is high, there is a disadvantage in that the dust layer is not easily shaken off from the dust collecting filter due to the nature of the dust itself, or the dust is re-attached to the adjacent filter to reduce dust collection performance.

In the case of selective catalytic reduction, there is an advantage that the installation cost and the operating cost is low because no catalytic reactor is required, but the reaction rate must be maintained high and the nitrogen oxide removal efficiency is low as 60% or less.

On the other hand, there is a limit in obtaining a high efficiency as a single structure device as described above for the removal of fine dust and nitrogen oxide, in order to overcome this point, a hybrid dust collector combined with two or more dust collecting principles have been developed.

That is, the method of the filter bag duster described above should shake off fine dust collected on the surface of the filter cloth by periodic dust-drying operation, but has a disadvantage in that the periodic dust-drying operation damages the filter cloth and shortens its life.

In order to solve this problem, as in the Republic of Korea Patent Publication No. 10-2008-0101501, and the Republic of Korea Patent Publication No. 10-2003-0024127, the fine dust load by installing an electrostatic precipitator or centrifugal dust collector and SCR in the filter bag dust collector Hybrid dust collectors have been developed to reduce the nitrogen oxides and remove nitrogen oxides.

However, the hybrid type dust collectors proposed to date have limitations in order to obtain high efficiency dust collection performance and nitrogen oxide removal performance. Therefore, it is necessary to develop a new apparatus to solve this problem.

Related prior arts include Korean Patent Publication No. 10-2008-0101501 and Korean Patent Publication No. 10-2003-0024127.

Accordingly, the technical problem of the present invention has been conceived in this regard, the object of the present invention is to combine the fine dust and nitrogen oxide using a pulse to remove more efficiently by the fine dust and nitrogen oxides are introduced using a pulse having an electrostatic force. Relates to a removal device.

Combination type fine dust and nitrogen oxide removal apparatus using a pulse according to an embodiment for realizing the object of the present invention is an electrostatic precipitator to charge and collect the fine dust in the exhaust gas, and fine dust not collected in the electrostatic precipitating unit or A dust collecting unit including a filter dust collecting unit for filtering fine dust re-spread from the electrostatic precipitating unit, and applying a pulse to the electrostatic precipitating unit and the filter dust collecting unit to drop fine dust collected on the electrostatic precipitating unit or filtered on the filter dust collecting unit. A dust extraction unit, a mixing unit for mixing the exhaust gas passing through the dust collection unit with a reducing agent and a reducing unit for selectively reducing and removing nitrogen oxides in the exhaust gas mixed with the reducing agent.

In one embodiment, the electrostatic precipitator includes first and second dust collecting modules extending in parallel to each other and spaced apart a predetermined distance, the filter dust collecting portion is located between the first and second dust collecting modules, It may extend in a direction parallel to the second dust collecting modules.

In an embodiment, each of the first and second dust collecting modules may include a plurality of discharge electrodes formed in a rod shape and charged with fine dust, and a plurality of dust collectors on which fine dust charged by the discharge electrodes are adsorbed. Can be.

In one embodiment, the discharge electrodes and the dust collecting poles may be alternately arranged.

In one embodiment, one end and the other end of each of the discharge electrode is connected to each other, it may be corona discharge by an externally applied pulse.

In one embodiment, each of the dust collecting poles, a plane, a first end surface extending in an oblique direction from one side of the plane and a second end surface branched into a plurality of plates toward the filter dust collector from the other side of the plane It may include.

In one embodiment, the dust collecting unit may further include a baffle plate disposed at a front end of the dust collecting unit to induce exhaust gas to be moved to each of the first and second dust collecting modules.

In one embodiment, the filter dust collection portion may include a plurality of filter bags through which exhaust gas is passed and fine dust is removed.

In one embodiment, the exhaust unit is a pulse generator for generating a pulse. It may include a pipe connected to the pulse generating unit for transmitting the pulse and a pulse line connected to the pipe to supply the pulse toward the upper portion of the dust collecting unit.

In one embodiment, the mixing unit may include an injection unit for injecting a reducing agent into the exhaust gas and a mixing member positioned below the injection unit to mix the reducing agent into the exhaust gas.

In one embodiment, the reducing unit may include a plurality of catalyst modules continuously arranged with respect to the traveling direction of the exhaust gas.

In one embodiment, each of the catalyst modules includes a plurality of blocks extending in parallel with the traveling direction of the exhaust gas, a gap is formed between the blocks, the exhaust gas is the block along the gap Nitrogen oxides can be selectively reduced by passing through and decreasing the moving speed.

In one embodiment, the reducing unit may further include a plasma unit for providing a low temperature plasma to the exhaust gas passing through the catalyst module.

According to embodiments of the present invention, the dust may be charged in advance by using a high voltage in the electrostatic precipitator so that the dust has a strong electrostatic force. In particular, by applying pulses at regular intervals to form corona on the entire surface of the discharge electrode, the particle charge effect is increased, while the average electric field strength and the adhesion force of the dust are lowered, thereby increasing the dust removal rate, thereby reducing reverse ionization.

In addition, the fine dust that is not collected in the electrostatic precipitator or re-spread by dust collection of the electrostatic precipitator has the effect of removing the ultra-fine dust and high-resistance dust by secondary collection in the filter dust collector.

In addition, since the fine dust contained in the exhaust gas is first collected in the electrostatic precipitator, the clogging phenomenon in the filter bag of the filter bag is significantly reduced, so that the pressure loss of the filter bags can be greatly reduced, the filtration speed is significantly improved, and the power cost is increased. It can reduce the effect of maximizing the driving performance.

Further, by inducing the exhaust gas to be first moved to the electrostatic precipitator through the baffle plate, fine dust may be guided to be removed by the electrostatic precipitator first.

In particular, the first end surface of each of the dust collecting electrodes may be formed to extend in an oblique direction to induce exhaust gas to move along the extending direction of the dust collecting modules.

On the other hand, the second end surface of each of the dust collecting poles is formed in a branched shape toward the filter dust collecting portion so that the fine dust not collected in the dust collecting poles can be removed by moving to the filter dust collecting portion.

In addition, a dust extraction unit for applying a pulse is located on the upper part of the dust collecting unit, and by applying a pulse to the dust collecting unit, impurities accumulated in the dust collecting electrode and the filter bag can be more effectively removed.

In addition, the mixing unit for mixing the reducing agent with respect to the exhaust gas passing through the dust collection unit, and configured to further pass the reducing unit for reducing the exhaust gas mixed with the reducing agent, thereby further removing impurities not filtered by the dust collection unit through the dust collection unit. As a result, the efficiency of removing impurities from the exhaust gas can be improved.

In particular, since a plurality is continuously formed along the traveling direction of the exhaust gas, the reduction of the nitrogen oxide may be repeatedly performed, thereby improving the removal efficiency.

Furthermore, the catalyst module may form gaps between the blocks and the blocks, thereby slowing the progress of exhaust gas to promote a reduction reaction, thereby further improving the removal efficiency.

1 is a schematic diagram showing a combination type dust and nitrogen oxide removal apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic view of the combined fine dust and nitrogen oxide removal apparatus of FIG. 1 observed from above. FIG.

3 is an exploded perspective view illustrating a dust collecting part of the combined fine dust and nitrogen oxide removing device of FIG. 1.

Figure 4 is a perspective view showing an example of the catalyst module of the combined fine dust and nitrogen oxide removal apparatus of FIG.

* Explanation of the sign

1: Combined fine dust and nitrogen oxide removal device 2: Chamber

10, 20, 30: first to third space

71, 72, 73, 74, 75: 1st-5th vane 100: Dust collector

110: electrostatic precipitating unit 120: first dust collecting module

130: second dust collecting module 140: discharge electrodes

150: dust collecting poles 160: bag filter

161: filter bag 170: baffle plate

200: dust exhausting unit 300: mixing unit

400: reduction unit 421: first block

422: second block 423: first blocking unit

424: second blocking unit 428: third blocking unit

As the inventive concept allows for various changes and numerous modifications, the embodiments will be described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprise" or "consist of" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

1 is a schematic diagram showing a combination type dust and nitrogen oxide removal apparatus according to an embodiment of the present invention. FIG. 2 is a schematic view of the combined fine dust and nitrogen oxide removal apparatus of FIG. 1 observed from above. FIG. 3 is an exploded perspective view illustrating a dust collecting part of the combined fine dust and nitrogen oxide removing device of FIG. 1. Figure 4 is a perspective view showing an example of the catalyst module of the combined fine dust and nitrogen oxide removal apparatus of FIG.

1 to 3, the combined fine dust and nitrogen oxide removal device 1 according to the present embodiment, the chamber 2 of the overall appearance and forming a receiving space therein, of the chamber 2 An inlet portion 3 formed at the front end to which the exhaust gas containing fine dust and nitrogen oxides is introduced, and an outlet portion 4 formed at the rear end of the chamber 2 to discharge the exhaust gas from which the fine dust and nitrogen oxides have been removed. It includes.

The chamber 2 may be formed in a square cylinder structure or a cylindrical structure such as square or rectangular, and the receiving space of the chamber 2 is a first space along the first direction X from the inlet portion 3. 10, the second space 20 and the third space 30 are sequentially divided.

The dust collecting unit 100 and the dust collecting unit 200 are formed in the first space 10, the mixing unit 300 is formed in the second space 20, and the reducing unit is disposed in the third space 30. 400 is formed, and the exhaust gas introduced into the inlet part 3 sequentially passes through the dust collecting unit 100 and the dust collecting part 200, the mixing part 300, and the reducing part 400. do.

The exhaust gas flowing into the inlet part 3 is generated from various facilities such as a waste incineration process, a blast furnace, a heat treatment facility, a petroleum refining facility, a petrochemical product manufacturing process, and includes fine dust particles and nitrogen oxides. It is done.

More specifically, the dust collecting unit 100 includes an electrostatic precipitator 110 and the filter dust collecting unit 160.

The electrostatic precipitator 110 charges fine dust in the exhaust gas in advance by using a pulse applied through the dust extraction unit 200 to be described later, so that fine dust has a strong electrostatic force, and collects the charged fine dust. Do it.

The electrostatic precipitator 110 includes a first dust collecting module 120 and a second dust collecting module 130 which are arranged in parallel with each other in the first direction and extend in a vertical direction perpendicular to the first direction. The first and second

dust collecting modules

120 and 130 are located at both sides of the filter bags 161 of the filter dust collecting unit 160 which will be described later.

In this case, each of the first and second

dust collecting modules

120 and 130 is arranged in parallel with each other in the first direction, and each of the plurality of discharge electrodes 140 is formed in a circular rod shape and charges fine dust. ) And a plurality of plates are formed to extend in contact with each other, and dust collecting electrodes 150 to which fine dust charged by the discharge electrodes 140 adhere to each other.

That is, the discharge electrodes 140 and the dust collecting electrodes 150 are disposed in the plurality of spaced apart at predetermined intervals along the first direction.

Here, the discharge electrodes 140 and the dust collecting electrodes 150 may have a shape in which they are alternately arranged.

Although not shown, a pulse applying unit is separately formed outside the chamber 2 to apply pulses to the discharge electrodes 140. Then, the pulse is sufficiently charged so that the corona starting voltage reaches between each of the discharge electrodes 140 and the dust collecting electrodes 150, and the corona discharge starts from the discharge electrodes 140. By the corona discharge, the insulation of the exhaust gas introduced between each of the discharge electrodes 140 and the dust collecting electrodes 150 is destroyed, so that the exhaust gas is in a plasma state, whereby a large amount of radicals and ozone are generated.

The exhaust gas is oxidative radicals such as O, OH, H2O, ozone (O3) and reducing agents such as H, N, NH, NH2 due to the collision of free dust with oxygen, water vapor, etc. in the exhaust gas in the plasma state Generated by radicals, the generated radicals are removed by adsorption on the dust collecting electrodes 150.

In this case, one end of each of the discharge electrodes 140 is connected to the first tube 521 and the other end thereof is connected to the second tube 522. In addition, one end of the first pipe 521 is connected to the first providing pipe 511 and the other end is connected to the second providing pipe 512.

The first and second providing

pipes

511 and 512 are connected to the pulse applying unit to receive a pulse, and supply the provided pulse to the discharge electrodes 140 through the first pipe 521. Then, a pulse is also supplied to the second tube 522 connected to the other end of each of the discharge electrodes 140, and a corona is formed on the entire surface of the discharge electrodes 140.

On the other hand, as described above, the electrostatic precipitator 110 includes first and second

dust collection modules

120 and 130 extending in parallel to each other.

In this case, the exhaust gas is moved to each of the first and second

dust collecting modules

120 and 130 so that the fine dust in the exhaust gas is effectively removed, and the front of the electrostatic precipitator 110 induces the movement of the exhaust gas. A baffle plate 170 may be formed.

The baffle plate 170 may be disposed in line with the filter dust collecting unit 160 to be described later and may be positioned at the foremost end of the filter dust collecting unit 160, so that the exhaust gas flowing directly is provided directly to the filter dust collecting unit 160. Can be blocked first.

The baffle plate 170 is a first baffle 173 extending in diagonal directions, ie, a first diagonal direction 171 and a second diagonal direction 121, which are separated from each other based on an extension direction of the electrostatic precipitator 110. ) And a second baffle 174.

In this case, an angle formed by the first and second oblique directions 171 and 121 may be set in various ways, and as shown, may be selected at any angle between 90 and 180 degrees.

Thus, the exhaust gas introduced into the inlet part 3 is moved to the space where the first and second

dust collecting modules

120 and 130 are formed by the baffle plate 170 to remove most of the fine dust. It becomes possible.

Furthermore, in order to more effectively remove the exhaust gas moved toward the first and second

dust collecting modules

120 and 130 by the baffle plate 170, the electrostatic precipitator 110 is illustrated in FIG. 3. As described above, each of the dust collecting poles 150 may include a plate-shaped plane 151, a first end surface 152 formed on one side of the plane 151, and an agent formed on the other side of the plane 151. 2 includes an end surface 153.

The first end surface 152 is formed in a plate shape extending in the third oblique direction 154, and the second end surface 153 faces the filter dust collecting part 160 from the plane 151. It is formed in the shape of a plurality of branched plates.

As shown, the third oblique direction 154 may have the same or a predetermined angle as the first oblique direction 171 and may be defined as a direction inclined with respect to the first direction X as a whole. Can be.

In this case, since both of the first and second

dust collecting modules

120 and 130 include the dust collecting poles 150, the first and second

dust collecting modules

120 and 130 are formed by the baffle plate 170. The third oblique direction 154 is formed by the first end surface 152 formed on the dust collecting poles 150 of each of the first and second dust collecting modules 120 130. As a result, movement in the air flows in the first direction X as a whole, whereby fine dust in the exhaust gas is removed by the electrostatic precipitator 110.

Also, in this case, fine dust not removed by the electrostatic precipitator 110 may be formed by the second end surface 153 formed on the respective dust collecting electrodes 150, that is, the second end surface 153. As it is configured in a branched shape to face the filter bags 161 of the filter dust collector, movement to the filter bags 161 is induced and further removed by the filter bags 161.

On the other hand, the filter dust collecting unit 160, as described above, since the first and second

dust collecting modules

120 and 130 are located at both sides, between the first and second

dust collecting modules

120 and 130. Will be located.

The filter dust collecting unit 160 collects fine dust that is not collected in the electrostatic precipitating unit 110 or is re-scattered due to the exhaustion of the electrostatic precipitating unit 110. That is, as described above, the fine dust that is not removed by the first and second

dust collecting modules

120 and 130 is separated by the filter dust collecting part by the second end surface 153 of each of the dust collecting poles 150. When the movement is guided to 160, the bag filter 160 collects and removes the fine dust.

The filter dust collecting unit 160 is formed in a cylindrical shape, each of which has an upper end and a lower end, and includes a plurality of filter bags 161 for removing fine dust.

As the exhaust gas passes through the filter bags 161 formed as described above, fine dust contained in the exhaust gas is adsorbed on the outer surface of each of the filter bags 161 and filtered.

In this case, as described above, the exhaust gas is first collected by the electrostatic precipitator 110 and then is not collected by the electrostatic precipitator 110 or re-spread due to exhaustion of the electrostatic precipitator 110. As fine dust is collected in the filter bags 161 of the filter bag 160, clogging of the filter bags 161 may be reduced, and the filtration speed of the filter bags 161 may be significantly improved. have.

In addition, as the plurality of filter bags 161 are arranged to be adjacent to each other in the first direction, dust collecting efficiency may be further improved.

Further, the filter bags 161 are disposed one by one between the pair of dust collectors 150 arranged adjacent to each other in the first direction, and thus, each of the filter bags 161 is respectively The discharge electrodes 140 may be arranged in parallel with each other.

The dust collecting unit 100 formed as a structure including the electrostatic precipitating unit 110 and the filter dust collecting unit 160 may be provided as two dust collecting units inside the chamber 2 as shown in FIG. 2. The number of dust collecting units 100 may be variously changed according to the width of the chamber 2.

Meanwhile, the dust collecting part 200 is formed on the dust collecting unit 100 to apply a pulse to each of the electrostatic precipitating unit 110 and the filter dust collecting unit 160. Accordingly, the fine dust collected in the dust collecting electrodes 150 and the fine dust filtered on the surfaces of the filter bags 161 fall.

More specifically, the exhaust unit 200 includes a pulse generator 210, a pipe 220, and a pulse line 230.

The pulse generator 210 generates a pulse and supplies the pulse to the pulse line 230 through the pipe 220, and the pulse line 230 supplies the supplied pulse to the electrostatic precipitator 110 and the filtration. It is provided to the dust collector 160.

In this case, the pulse line 230 is formed to branch toward the respective filter bags 161 from the pipe 220 when a plurality of filter bags 161 are arranged.

As such, when the pulse is supplied to the upper portion of the electrostatic precipitator 110 and the filter dust collector 160 through the pulse line 230, the fine dust and filter bags adsorbed to the dust collectors 150. Fine dust adhering to the surface of 161 is exhausted and settles downward.

In this case, pressure is applied from the upper portion to the lower portion of the electrostatic precipitator 110 and the filter precipitating unit 160 by the pulses. It will fall from the surface of the field 161 and settle downward.

As such, the fine dust settled downward is accumulated by the first hopper 5a and the second hopper 5b. In this case, although not shown, a valve (not shown) may be formed at the lower portions of the first and

second hoppers

5a and 5b to discharge the fine dust downward through opening when a predetermined amount or more of fine dust is accumulated. have.

As the pulse is supplied from the dust extraction unit 200 as described above, fine dust accumulated in the dust collecting electrodes 150 and the filter bags 161 may be more effectively removed at the same time.

In addition, the exhaust gas from which the fine dust is removed is discharged through the outlet part 4 after passing through the mixing part 300 and the reducing part 400.

In this case, the mixing unit 300 injects and mixes a reducing agent into the exhaust gas passing through the dust collecting unit 100, and the reducing unit 400 selectively selects nitrogen oxides in the exhaust gas passing through the mixing unit 300. Reduced to remove.

More specifically, the mixing unit 300 is uniformly mixed with a reducing agent before the exhaust gas passing through the dust collecting unit 100 is supplied to the reducing unit 400 to remove the nitrogen oxides by the reducing unit 400 efficiency In order to increase the configuration, the right side of the dust collecting unit 100, that is, is formed in the second space 20 formed between the dust collecting unit 100 and the reducing unit 400.

The mixing part 300 includes an injection part 310 and a mixing member 320.

Here, the injection unit 310 injects a reducing agent into the exhaust gas collected by the dust collecting unit 100, the reducing agent may be, for example, ammonia (NH3) or urea (Urea). On the other hand, although not shown, the injection unit 310 may be connected to a storage tank and a pump for storing and supplying the reducing agent may be supplied with the reducing agent from the storage tank and the pump.

The mixing member 320 is positioned below the injection unit 310 to mix the reducing agent injected from the injection unit 310 and the exhaust gas.

As illustrated, the mixing member 320 may include a first mixing member 321 and a second mixing member 322 that are spaced apart from each other by a predetermined interval up and down. Thus, the reducing agent injected from the injection unit 310 is primarily mixed with the exhaust gas by the first mixing member 321, and then the secondary gas and secondary by the second mixing member 322. By mixing, the mixing ratio with the exhaust gas may be improved.

In this case, it is apparent that the number of the mixing members may be variously changed in consideration of the mixing speed, mixing efficiency, etc. of the exhaust gas and the reducing agent.

On the other hand, in the upper space of the mixing unit 300, the first vane formed in a shape bent toward the mixing unit 300 so that the exhaust gas collected in the dust collecting unit 100 is guided to the mixing unit 300 An exhaust gas lowered to serve as the first vane 71 so that an exhaust gas mixed with the reducing agent is induced in the lower space of the mixing part 300 so that the exhaust gas mixed with the reducing agent is induced to the reducing part 400. The second vane 72 and the third vane 73 for guiding the supply to the reduction unit 400 is installed.

In this case, the second vane 72 and the third vane 73 may be installed to be bent in a symmetrical shape to guide the lower vane 72 to move upward while moving the lower exhaust gas to the right.

As such, the mixing unit 300 injects and mixes a reducing agent with the exhaust gas, and the exhaust gas mixed with the reducing agent is provided to the reducing unit 400.

The reduction unit 400 includes a plurality of catalyst modules 420.

The catalyst module 420 accelerates the reducing action of the reducing agent and the exhaust gas, and nitrogen oxide (NOx) is selectively reduced and removed from the exhaust gas through the catalyst module 420.

On the other hand, the plurality of catalyst modules 420 are connected in a line along the extending direction of the reducing unit. Thus, the selective reduction of the nitrogen oxides is repeated a plurality of times to more effectively remove the nitrogen oxides from the exhaust gas.

Each of the catalyst modules 420 is composed of a pellet-shaped SCR catalyst extending in the first direction.

More specifically, referring to FIG. 4, the catalyst module 420 is arranged such that a plurality of square blocks extend along an extension direction of the reduction unit 400, and the space between the blocks is either upper or lower. It is open to one side and closed on the other side. Thus, the exhaust gas drawn to the open one side passes through the square blocks, the speed decreases and is then discharged to the other open side. Accordingly, as the velocity decreases through the rectangular blocks, the nitrogen oxides are reduced and thus more effective in removing the nitrogen oxides.

For example, as shown in FIG. 4, the catalyst module 420 forms a first gap 426 and a pair of first blocks 421 extending in parallel with each other, and a second gap 427. And a pair of second blocks 422 extending parallel to one another.

In this case, an upper portion of the first block 421 is blocked by the first blocking portion 423, and an upper portion of the second block 422 is blocked by the second blocking portion 424 and adjacent to each other. Lower spaces of the first block 421 and the second block 422 are blocked by the third blocking unit 428.

Thus, a through gap 425 is formed between the first and

second blocks

421 and 422 adjacent to each other, the upper part of which is opened, and the lower part of which is blocked.

Accordingly, the exhaust gas passing through the reducing part 400 is introduced through the catalyst module 420 through the through gap 425, and then passes through the first block 421 or the second block 422. After passing, the lower part is discharged downward through the open first gap 426 or the second gap 427.

In addition, in the present embodiment, since the plurality of catalyst modules 420 are continuously disposed along the reduction unit 400, the inlet and discharge steps as described above may be repeated by the number of arrangement of the catalyst modules.

In addition, the reducing unit 400 may include a plasma unit (not shown) to provide a low temperature plasma to the exhaust gas moved from the mixing unit 300 to the reducing unit 400 through the plasma unit. .

In this case, the plasma unit provides a low temperature plasma to the catalyst module 420, whereby the nitrogen oxides (NOx) in the exhaust gas passing through the catalyst module 420 reacts with the low temperature plasma, thereby reducing the effect. Can be accelerated further.

On the other hand, although not shown, the plasma unit may be located outside the third space 30 of the chamber 2 to provide a low temperature plasma to the catalyst module 420, the third space 30 It may be disposed inside or adjacent to the catalyst module 420 to provide a low temperature plasma.

The exhaust gas from which nitrogen oxide has been removed by passing through the catalyst modules 420 is discharged to the outside through the outlet portion 4.

On the other hand, in this case, the fourth vane 74 and the fifth vane 75 are installed in the shape bent symmetrically to each other in the upper portion of the reducing unit 400, the exhaust gas passing through the catalyst modules 420 is Guide to move to the outlet (4).

According to the embodiments of the present invention as described above, the dust can be charged in advance using a high voltage in the electrostatic precipitator so that the dust has a strong electrostatic force. In particular, by applying pulses at regular intervals to form corona on the entire surface of the discharge electrode, the particle charge effect is increased, while the average electric field strength and the adhesion force of the dust are lowered, thereby increasing the dust removal rate, thereby reducing reverse ionization.

In addition, fine dust that is not collected in the electrostatic precipitator or re-spread due to the exhaustion of the electrostatic precipitator is collected in the filter dust collection unit to remove ultrafine dust and high resistance dust.

In addition, since the fine dust contained in the exhaust gas is first collected in the electrostatic precipitator, the clogging phenomenon in the filter bag of the filter bag is significantly reduced, so that the pressure loss of the filter bags can be greatly reduced, and the filtration speed is significantly improved. It can reduce the effect of maximizing the driving performance.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims

A dust collecting unit including an electrostatic precipitating unit charging and collecting fine dust in exhaust gas, and a filter dust collecting unit for filtering fine dust not collected in the electrostatic precipitating unit or fine dust re-spread in the electrostatic precipitating unit;

A dust extraction unit applying pulses to the electrostatic precipitating unit and the filter dust collecting unit to drop fine dust collected in the electrostatic precipitating unit or filtered by the filter dust collecting unit;

A mixing unit for mixing the exhaust gas passing through the dust collecting unit with a reducing agent; And

Combination fine dust and nitrogen oxide removal apparatus comprising a reducing unit for selectively reducing and removing nitrogen oxides in the exhaust gas mixed with the reducing agent.
The method of claim 1,

The electrostatic precipitator includes first and second dust collecting modules extending parallel to each other and spaced a predetermined distance,

The filter dust collector is located between the first and the second dust collecting module and combined dust and nitrogen oxide removal device, characterized in that extending in a direction parallel to the first and second dust collecting modules.
The method of claim 2, wherein each of the first and second dust collecting modules,

A plurality of discharge electrodes formed in a rod shape and charged with fine dust; And

Combination fine dust and nitrogen oxide removal device, characterized in that it comprises a plurality of dust collecting poles are adsorbed fine dust by the discharge electrodes.
The method of claim 3,

Combination fine dust and nitrogen oxide removal apparatus, characterized in that the discharge electrode and the dust collecting poles are alternately arranged.
The method of claim 3,

One end and the other end of each of the discharge electrode is connected to each other, combined dust and nitrogen oxide removal device, characterized in that the corona discharge by a pulse applied from the outside.
The method of claim 3, wherein each of the dust collecting poles,

plane;

A first end surface extending in an oblique direction from one side of the plane; And

Combination fine dust and nitrogen oxide removal device comprising a second end surface which is branched into a plurality of plates toward the filter dust collection portion from the other side of the plane.
According to claim 2, wherein the dust collecting unit,

Combination fine dust and nitrogen oxide removal device, characterized in that it further comprises a baffle plate disposed in front of the dust collecting unit, to induce exhaust gas to be moved to each of the first and second dust collecting modules.
The method of claim 2, wherein the filter dust collector,

Combination fine dust and nitrogen oxide removal apparatus characterized in that it comprises a plurality of filter bags through which exhaust gas is passed and fine dust is removed.
The method of claim 1, wherein the dust extraction unit,

A pulse generator for generating a pulse;

A pipe connected to the pulse generator to transfer the pulse; And

Combination fine dust and nitrogen oxide removal device comprising a pulse line connected to the pipe for supplying the pulse toward the upper portion of the dust collecting unit.
The method of claim 1, wherein the mixing unit,

An injection unit for injecting a reducing agent into the exhaust gas; And

Combination type fine dust and nitrogen oxide removal device characterized in that it comprises a mixing member which is located below the injection unit for mixing the reducing agent to the exhaust gas.
The method of claim 1, wherein the reducing unit,

Combination type fine dust and nitrogen oxide removal device comprising a plurality of catalyst modules that are continuously arranged with respect to the traveling direction of the exhaust gas.
The method of claim 11,

Each of the catalyst modules includes a plurality of blocks extending in parallel with the traveling direction of the exhaust gas,

A gap is formed between the blocks, and the exhaust gas passes through the block along the gap, and the movement speed decreases, so that the nitrogen oxides are selectively reduced.
The method of claim 12, wherein the reducing unit,

Combination fine dust and nitrogen oxide removal apparatus further comprises a plasma unit for providing a low temperature plasma to the exhaust gas passing through the catalyst module.