KR101896948B1 - Integrated removal apparatus of removing fine particulate and nitrogen oxide using pulse type high voltage - Google Patents

Abstract

The combined particulate matter and nitrogen oxide removal apparatus includes an electric dust collection unit for collecting and collecting fine dust in the exhaust gas, and a dust collecting unit for filtering the fine dust not collected by the electric dust collection unit or the fine dust re- A dust removing unit for applying a pulse to the dust collecting unit, the electric dust collecting unit and the dust collecting unit to drop fine dust that is collected in the electric dust collecting unit or filtered by the dust collecting unit, And a reducing unit for selectively reducing and removing nitrogen oxides from the exhaust gas mixed with the reducing agent.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and a method for removing fine dust and nitrogen oxides using pulses,

The present invention relates to a combinational fine dust and nitrogen oxide removing apparatus, and more particularly, to a combinational fine dust and nitrogen oxide removing apparatus using a pulsed fine dust and nitrogen oxide, which are pulsed to remove electrostatic force, Removing device.

Among the representative air pollutants, fine dust particles range in size from 0.1 to 10 μm, mainly occurring in fossil fuel combustion furnace, power plant, waste incineration process, blast furnace of steelmaking process, heat treatment facility, petroleum refining and petrochemical manufacturing process .

Electrostatic precipitators, filter cloth dust collectors, and selective catalytic reduction (SCR) methods are used to remove fine dust particles and nitrogen oxides discharged from such industrial processes.

Electrostatic precipitator uses electrostatic principle by corona discharge. It has a high initial installation cost and high operating cost, and it is affected by electric resistance depending on the kind of dust particles.

In the case of dust collecting apparatus, when the dust is accumulated in the dust collecting filter, the dust must be removed by a physical impact, which causes the damage or efficiency of the dust collecting filter to be deteriorated and additional equipment or additional cost for dust removal is required. When the concentration is high or the filtration speed is high, the dust layer is not easily shaken from the dust filter due to the nature of the dust itself, or the dust that is shaken is reattached to the adjacent filter, and the dust collecting performance is deteriorated.

In the case of selective catalytic reduction, there is a merit that the installation cost and the operation ratio are inexpensive because a catalytic reactor is not necessary, but the reaction rate must be kept high and the removal efficiency of nitrogen oxide is less than 60%.

On the other hand, since the single structure device as described above has a limitation in achieving high efficiency for removing fine dust and nitrogen oxide, a hybrid type dust collector having two or more dust collecting principles has been developed in order to overcome this problem.

That is, in the method using the filter cloth dust collector described above, the fine dust collected on the surface of the filter cloth must be shaken by the periodic dust removing operation, but the periodic dust removing operation damages the filter cloth and shortens the service life.

In order to solve this problem, as disclosed in Korean Patent Laid-Open No. 10-2008-0101501 and Korean Patent Laid-Open No. 10-2003-0024127, an electrostatic dust precipitator or a centrifugal dust collector and SCR are installed in a filter cloth dust collector, Hybrid type dust collectors have been developed to reduce nitrogen oxides.

However, in the case of the hybrid type dust collectors proposed so far, it is necessary to develop a new device to solve the high efficiency dust collecting performance and nitrogen oxide removal performance.

Korean Patent Publication No. 10-2008-0101501 Korean Patent Publication No. 10-2003-0024127

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a fine particle dust and nitrogen oxides which are pulsed for pulsing, Removing device.

According to an embodiment of the present invention, there is provided an apparatus for removing particulate matter and nitrogen oxides using pulses, comprising: an electric dust collection unit for collecting and collecting fine dust in an exhaust gas; A pulsation is applied to the dust collecting unit including the dust collecting unit, the dust collecting unit including the dust collecting unit and the filter dust collecting unit, and the fine dust that has been collected by the dust collecting unit or filtered by the dust collecting unit is dropped And a reducing unit for selectively reducing the nitrogen oxides in the exhaust gas mixed with the reducing agent to remove the nitrogen oxides.

In one embodiment, the electrical dust collecting part includes first and second dust collecting modules extending parallel to each other and spaced a predetermined distance, the filtering dust collecting part being located between the first and second dust collecting modules, And may extend in a direction parallel to the second dust collection modules.

In one embodiment, each of the first and second dust collecting modules includes a plurality of discharge poles formed in a rod shape for charging fine dust particles, and a plurality of dust collecting poles for attracting charged fine particles by the discharge poles .

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

In one embodiment, one end and the other end of each of the discharge electrodes are connected to each other, and corona discharge can be performed by a pulse applied from the outside.

In one embodiment, each of the dust collecting poles has a flat surface, a first end surface extending in a diagonal direction from one side of the plane, and a second end surface diverging from the other side of the plane toward the filtration and dust collecting portion into a plurality of plates .

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

In one embodiment, the filtering and dust collecting part may include a plurality of filter bags through which exhaust gas passes and fine dust is removed.

In one embodiment, the evacuation unit generates a pulse. A pipe connected to the pulse generating unit to transmit the pulse, and a supply pipe connected to the pipe to supply the pulse toward the upper part of the dust collecting unit.

In one embodiment, the mixing portion may include a spray portion injecting a reducing agent into the exhaust gas, and a mixing member located below the spray portion and mixing the reducing agent into the exhaust gas.

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

In one embodiment, each of the catalyst modules includes a plurality of blocks extending parallel to the direction of travel of the exhaust gas, and a gap is formed between the blocks, The nitrogen oxide can be selectively reduced by decreasing the moving speed.

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

According to the embodiments of the present invention, dust can be charged in advance by using a high voltage in the electric dust collecting unit, so that dust can have a strong electrostatic force. Particularly, by applying the pulses at regular intervals to form a corona on the entire surface of the discharge electrode, the particle charging effect increases, while the average electric field strength and the adhesion force of the dust are lowered and the dust removal rate is increased.

Further, the fine dust that has not been collected by the electric dust collection unit or is re-scattered due to the exhaustion of the electric dust collection unit is secondarily collected by the filtering and dust collecting unit, thereby removing ultrafine dust and high-resistance dust.

Further, since the fine dust contained in the exhaust gas is primarily collected in the electric dust collection section, the clogging phenomenon is significantly reduced in the filter bags of the filter dust collecting section, the pressure loss of the filter bags can be greatly reduced, the filtration speed is significantly improved, It is possible to maximize the driving performance.

In addition, the exhaust gas can be guided to the electric dust collection unit through the baffle plate, thereby guiding the fine dust to be removed first by the electric dust collection unit.

Particularly, the first end surface of each of the dust collecting poles is extended in the diagonal direction so that the exhaust gas can be guided to move along the extending direction of the dust collecting modules.

The second end surface of each of the dust collecting poles is formed in a shape branched toward the filtering dust collecting part, so that the fine dust not collected on the dust collecting holes can be moved to and removed from the filtering dust collecting part.

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

Further, the exhaust gas passing through the dust collecting unit is further passed through a mixing section for mixing the reducing agent and a reducing section for reducing the exhaust gas mixed with the reducing agent, whereby the unfiltered impurities are further removed Whereby the impurity removal efficiency with respect to the exhaust gas can be improved.

Particularly, since a plurality of units are continuously formed along the traveling direction of the flue gas, reduction of the nitrogen oxides can be repeatedly performed, and the removal efficiency can be improved.

Further, the catalyst module forms gaps between the blocks and the blocks, thereby promoting the reduction reaction by slowing the progress of the exhaust gas, thereby further improving the removal efficiency.

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

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. The terms first, second, etc. 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 embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the term "comprises" or "comprising ", etc. is intended to specify that there is a stated feature, figure, step, operation, component, But do not preclude the presence or addition of one or more other features, integers, 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 to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

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

1 to 3, the combined type fine dust and nitrogen oxide removing apparatus 1 according to the present embodiment includes a chamber 2 forming an overall external shape and forming a receiving space therein, An inflow portion 3 formed at the front end of the chamber 2 to receive an exhaust gas containing fine dust and nitrogen oxides and an outflow portion 4 formed at a rear end of the chamber 2 to discharge exhaust gas from which fine dust and nitrogen oxides have been removed, .

The chamber 2 may be formed in a rectangular or cylindrical shape such as a square or a rectangle and a receiving space of the chamber 2 may be formed in the first space X along the first direction X from the inlet 3. [ (10), the second space (20) and the third space (30).

A dust collecting unit 100 and a dust removing unit 200 are formed in the first space 10 and a mixing unit 300 is formed in the second space 20. In the third space 30, The exhaust gas flowing into the inlet portion 3 sequentially passes through the dust collecting unit 100 and the dust removing unit 200, the mixing unit 300, and the reducing unit 400, do.

The exhaust gas flowing into the inflow section 3 is generated from various facilities such as a waste incineration process, a furnace, a heat treatment facility, a petroleum refinery facility, and a petrochemical production process, and is characterized by including fine dust particles and nitrogen oxides .

More specifically, the dust collecting part includes an electric dust collecting part 110 and a filtering dust collecting part 160.

The electrostatic dust collecting unit 110 charges the fine dust in the exhaust gas in advance by using the pulse applied through the discharging unit 200 to be described later so as to have a strong electrostatic force and to collect the charged fine dust .

The electric dust collecting unit 110 includes a first dust collecting module 120 and a second dust collecting module 130 arranged in parallel to each other along the first direction and extending in a vertical direction perpendicular to the first direction. The first and second dust collecting modules 120 and 130 are located on both sides of the filter bags 161 of the filter dust collecting part 160 described later.

In this case, the first and second dust collecting modules 120 and 130 are arranged parallel to each other in the first direction, and each of the first and second dust collecting modules 120 and 130 is formed in a circular rod shape and includes a plurality of discharge electrodes 140 And dust collecting poles 150 formed by extending a plurality of plates while being in contact with each other and attracting fine dust charged by the discharge electrodes 140.

That is, a plurality of the discharge electrodes 140 and the dust collecting electrodes 150 are spaced apart from each other along the first direction.

Here, the discharge electrodes 140 and the dust collecting electrodes 150 may be 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 pulses are sufficiently charged, and a corona discharge voltage is reached between each of the discharge electrodes 140 and each of the dust collecting poles 150 to start corona discharge from the discharge electrodes 140. This corona discharge destroys the insulation of the exhaust gas flowing between each of the discharge electrodes 140 and the dust collecting poles 150, so that the exhaust gas is in a plasma state, thereby generating a large amount of radicals and ozone.

In the exhaust gas state, fine dust including oxygen, water vapor, and the like in the exhaust gas collides with free electrons in the plasma state, and oxidizing radicals such as O, OH, H2O and ozone (O3) And the generated radicals are adsorbed on the dust collecting electrodes 150 to be removed.

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

The first and second supply pipes 511 and 512 are connected to the pulse applying unit to receive a pulse and supply the supplied pulse to the discharge electrodes 140 through the first pipe 521. 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.

Meanwhile, as described above, the electric dust collecting unit 110 includes first and second dust collecting modules 120 and 130 extending in parallel with each other.

In this case, in order to effectively remove fine dust in the exhaust gas by moving the exhaust gas to each of the first and second dust collecting modules 120 and 130, the front end of the electric dust collecting unit 110 induces the movement of the exhaust gas A baffle plate 170 may be formed.

The baffle plate 170 may be arranged in a line with the filtering and dust collecting unit 160 to be described later and may be positioned at the front end of the filtering and collecting unit 160 so that the flowing exhaust gas is directly supplied to the filtering and collecting unit 160 Can be blocked primarily.

The baffle plate 170 includes a first baffle 173 and a second baffle 173 extending in a diagonal direction away from each other with respect to an extending direction of the electric dust collecting unit 110, that is, a first diagonal direction 171 and a second diagonal direction 121, And a second baffle 174.

In this case, the angle formed by the first and second oblique directions 171 and 121 may be variously set. As shown in the figure, the angle may be selected from any angle between 90 and 180 degrees.

Thus, the exhaust gas flowing into the inlet portion 3 is moved to the space in which the first and second dust collecting modules 120 and 130 are formed by the baffle plate 170, and most of the fine dust contained therein is removed .

Further, 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 by the electric dust collecting unit 110, Each of the dust collecting poles 150 includes a plate-shaped plane 151, a first end surface 152 formed on one side of the plane 151, and a second end surface 152 formed on the other side of the plane 151 Two end faces 153,

The first end face 152 is formed in a plate shape extending in the third oblique direction 154 and the second end face 153 is formed in a shape extending from the plane 151 toward the filtration and dust collecting part 160 And is formed into a plurality of plate shapes.

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

In this case, since both the first and second dust collecting modules 120 and 130 include the dust collecting electrodes 150, the first and second dust collecting modules 120 and 130 Is directed toward the third oblique direction 154 by the first end surface 152 formed in the dust collecting poles 150 of each of the first and second dust collecting modules 120 130, So that the fine dust in the exhaust gas is removed by the electric dust collecting unit 110. In this case,

In this case, the fine dust not removed by the electric dust collecting unit 110 is separated by the second end surface 153 formed on each of the dust collecting poles 150, that is, the second end surface 153, The filter bags 161 are arranged in a shape branched toward the filter bags 161 of the filtration and dust collecting part so that movement is induced to the filter bags 161 and further removed by the filter bags 161.

As described above, since the first and second dust collecting modules 120 and 130 are located on both sides of the dust collecting unit 160, the first and second dust collecting modules 120 and 130 are disposed between the first and second dust collecting modules 120 and 130, .

The filtering dust collecting unit 160 collects the fine dust that is not collected by the electric dust collecting unit 110 or is re-scattered due to exhaustion of the electric dust collecting unit 110. That is, as described above, fine dust not removed by the first and second dust collecting modules 120 and 130 is separated by the second end 153 of each of the dust collecting poles 150 from the dust collecting part 160 The dust collecting unit 160 collects and removes the fine dust.

The filtering and dust collecting unit 160 includes a plurality of filter bags 161 that are formed in a columnar shape with upper and lower ends opened to remove fine dust.

As the exhaust gas passes through the filter bags 161 having such a structure, the fine dust contained in the exhaust gas is adsorbed on the outer surface of each of the filter bags 161 and is filtered.

In this case, as described above, since the exhaust gas is primarily collected first by the electric dust collecting unit 110, then is not collected by the electric dust collecting unit 110, or is scattered again due to discharge of the electric dust collecting unit 110 The fine dust particles are trapped in the filter bags 161 of the filter dust collecting part 160 so that the clogging of the filter bags 161 is reduced and the filtration speed through the filter bags 161 is remarkably improved have.

Further, since the plurality of filter bags 161 are arranged adjacent to each other in the first direction, the dust collecting efficiency can be further improved.

Further, the filter bags 161 are arranged one by one between a pair of dust collecting poles 150 arranged adjacent to each other in the first direction, And the discharge electrodes 140 may be arranged side by side.

2, the dust collecting unit 100 having the structure including the electric dust collecting unit 110 and the filtering dust collecting unit 160 may be provided as two dust collecting units inside the chamber 2, , The number of the dust collecting units (100) may be variously changed according to the width of the chamber (2).

The dust removing unit 200 is formed on the dust collecting unit 100 and applies pulses to the dust collecting unit 110 and the dust collecting unit 160, respectively. Accordingly, the fine dust collected on the dust collecting poles 150 and the fine dust filtered on the surface of the filter bags 161 fall down.

More specifically, the dust removing unit 200 includes a pulse generating unit 210, a pipe 220, and a supply pipe 230.

The pulse generator 210 generates a pulse and supplies the generated pulse to the supply pipe 230 through the pipe 220. The supply pipe 230 supplies the pulse to the electric dust collector 110 and the filtration / 160).

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

When the pulses are supplied to the upper portions of the electric dust collecting unit 110 and the filter dust collecting unit 160 through the supply pipe 230, the fine dust adsorbed to the dust collecting electrodes 150 and the filter bags 161 are exhausted and settled downward.

In this case, a pressure is applied to the lower portion of the electric dust collecting unit 110 and the filtering dust collecting unit 160 downward by the pulse. At this time, the fine dusts can not withstand the pressure, So that it sinks to the bottom.

The fine dust precipitated in the lower part is accumulated in the first hopper 5a and the second hopper 5b. In this case, although not shown, a valve (not shown) may be formed in the lower portion of the first and second hoppers 5a and 5b to discharge the fine dust through the opening when the predetermined amount of fine dust accumulates have.

As described above, by supplying pulses from the dust-removing unit 200, fine dust accumulated in the dust collecting electrodes 150 and the filter bags 161 can be removed more effectively at the same time.

The exhaust gas from which fine dust has been removed as described above is discharged through the outlet portion 4 after passing through the mixing portion 300 and the reducing portion 400.

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

More specifically, the mixing unit 300 uniformly mixes the exhaust gas passed through the dust collecting unit 100 with the reducing agent before being supplied to the reducing unit 400, so that the nitrogen oxide removal efficiency And is formed in the second space 20 formed on the right side of the dust collecting unit 100, that is, between the dust collecting unit 100 and the reducing unit 400.

The mixing unit 300 includes a jetting unit 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, and the reducing agent may be, for example, ammonia (NH3) or urea (Urea). Meanwhile, although not shown, the jetting unit 300 may be connected to a storage tank and a pump for storing and supplying the reducing agent, and may receive the reducing agent from the storage tank and the pump.

The mixing member 320 is located below the jetting unit 310 and mixes the reducing agent injected from the jetting unit 310 and the flue gas.

The mixing member 320 may include a first mixing member 321 and a second mixing member 322 spaced apart from each other by a predetermined distance. Thus, the reducing agent injected from the spraying unit 310 is mixed with the exhaust gas primarily by the first mixing member 321, and then is mixed with the exhaust gas by the second mixing member 322, By mixing, the mixing ratio with the flue gas can be improved.

In this case, it is obvious that the number of the mixing members can be variously changed in consideration of the mixing rate of the exhaust gas and the reducing agent, the mixing efficiency, and the like.

The first vane 300 is bent in the upper space of the mixing part 300 toward the mixing part 300 so that the exhaust gas collected in the dust collecting unit 100 is moved to the mixing part 300. And the exhaust gas mixed with the reducing agent is introduced into the lower space of the mixing part 300 so as to serve as the first vane 71 so that the exhaust gas mixed with the reducing agent is guided to the reducing part 400, And a second vane 72 and a third vane 73 for guiding the second vane 72 to the reduction.

In this case, the second vane 72 and the third vane 73 are installed to be bent in symmetrical shapes so that the lowered exhaust gas can be guided to move upward to the right while being moved to the right.

As described above, the mixing unit 300 injects and mixes the reducing agent to the exhaust gas, and the exhaust gas mixed with the reducing agent is supplied to the reducing unit 400.

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

The reducing action of the reducing agent and the exhaust gas is accelerated in the catalyst module 420 and the NO x is selectively reduced and removed from the exhaust gas through the catalyst module 420.

Meanwhile, a plurality of the catalyst modules 420 are connected in series along the extending direction of the reducing unit. Thus, the selective reduction of the nitrogen oxide can be repeated a plurality of times to more effectively remove the nitrogen oxide from the exhaust gas.

Each of the catalyst modules 410 and 420 is formed of a pellet-shaped SCR catalyst extending in the first direction.

4, the catalyst module 420 is arranged such that a plurality of rectangular blocks are arranged to extend along the extending direction of the reducing unit 400, and a space between each of the blocks is an upper side or a lower side Open to one side, and closed to the other side. Thus, the flue gas introduced into the open side passes through the square blocks and the speed is reduced and then discharged to the other open side. Accordingly, it is more effective to remove nitrogen oxides by securing the time for nitrogen oxide to be reduced and removed as the velocity decreases through the square blocks.

4, the catalyst module 420 may include a pair of first blocks 421 forming a first gap 426 and extending in parallel with each other, and a second gap 427, And a pair of second blocks 422 extending parallel to each other.

At this time, the upper portion of the first block 421 is blocked by the first blocking portion 423, the upper portion of the second block 422 is blocked by the second blocking portion 424, The spaces of the first block 421 and the second block 422 are blocked by the third blocking portion 425.

Thus, between the first and second blocks 421 and 422 adjacent to each other, a through gap 425 is formed in which the upper portion is opened and the lower portion is blocked.

The exhaust gas passing through the reduction unit 400 is introduced through the catalyst module 420 through the penetration gap 425 and then passes through the first block 421 or the second block 422 After passing, the lower portion is discharged to the lower side through the first gap 426 or the second gap 427 which is opened.

In this embodiment, since a plurality of the catalyst modules 420 are continuously disposed along the reducing unit 400, the inlet and outlet steps as described above can be repeated as many as the number of the catalyst modules.

The reducing unit 400 includes a low-temperature plasma supply unit (not shown) to supply a low-temperature plasma to the exhaust gas flowing from the mixing unit 300 to the reducing unit 400 through the low-temperature plasma supply unit can do.

In this case, the low-temperature plasma providing unit provides the low-temperature plasma to the catalyst module 420, whereby the nitrogen oxide (NOx) in the exhaust gas passing through the catalyst module 420 reacts with the low- Can be further accelerated.

Although not shown, the low-temperature plasma providing unit may be located outside the third space 30 of the chamber 2 to provide a low-temperature plasma to the catalyst module 420, Or may be disposed adjacent to the catalyst module 420 to provide a low temperature plasma.

The exhaust gas passing through the catalyst modules 420 and having the nitrogen oxide removed therefrom flows out to the outside through the outflow section 4. [

In this case, the fourth vane 74 and the fifth vane 75 are symmetrically bent at the upper portion of the reducing unit 400, so that the exhaust gas passing through the catalyst modules 420 So as to be guided to the outflow portion 4.

According to the embodiments of the present invention as described above, dust can be charged in advance by using a high voltage in the electric dust collecting unit, so that dust can have strong electrostatic force. Particularly, by applying the pulses at regular intervals to form a corona on the entire surface of the discharge electrode, the particle charging effect increases, while the average electric field strength and the adhesion force of the dust are lowered and the dust removal rate is increased.

Further, the fine dust that has not been collected by the electric dust collection unit or is re-scattered due to the exhaustion of the electric dust collection unit is secondarily collected by the filtering and dust collecting unit, thereby removing ultrafine dust and high-resistance dust.

Further, since the fine dust contained in the exhaust gas is primarily collected in the electric dust collection section, the clogging phenomenon is significantly reduced in the filter bags of the filter dust collecting section, the pressure loss of the filter bags can be greatly reduced, the filtration speed is significantly improved, It is possible to maximize the driving performance.

In addition, the exhaust gas can be guided to the electric dust collection unit through the baffle plate, thereby guiding the fine dust to be removed first by the electric dust collection unit.

Particularly, the first end surface of each of the dust collecting poles is extended in the diagonal direction so that the exhaust gas can be guided to move along the extending direction of the dust collecting modules.

The second end surface of each of the dust collecting poles is formed in a shape branched toward the filtering dust collecting part, so that the fine dust not collected on the dust collecting holes can be moved to and removed from the filtering dust collecting part.

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

Further, the exhaust gas passing through the dust collecting unit is further passed through a mixing section for mixing the reducing agent and a reducing section for reducing the exhaust gas mixed with the reducing agent, whereby the unfiltered impurities are further removed Whereby the impurity removal efficiency with respect to the exhaust gas can be improved.

Particularly, since a plurality of units are continuously formed along the traveling direction of the flue gas, reduction of the nitrogen oxides can be repeatedly performed, and the removal efficiency can be improved.

Further, the catalyst module forms gaps between the blocks and the blocks, thereby promoting the reduction reaction by slowing the progress of the exhaust gas, thereby further improving the removal efficiency.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. It can be understood that it is possible.

The combined type fine dust and nitrogen oxide removing apparatus according to the present invention has industrial applicability that can be used in a coal-fired power plant, a sintering process, a waste incinerator, and the like for the prevention of micro dust and nitrogen oxides.

1: Combination type fine dust and nitrogen oxide removal device 2: Chamber
10, 20, 30: first to third spaces
71, 72, 73, 74, 75: First to fifth vanes 100:
110: electric dust collector 120: first dust collecting module
130: Second Collector Module 140:
150: dust collecting poles 160: filtering dust collecting part
161: filter bag 170: baffle plate
200: discharging part 300: mixing part
400: Reduction unit 421: First block
422: second block 423: first blocking portion
424: second blocking portion 425: third blocking portion

Claims (13)

An electric dust collection unit including first and second dust collecting modules extending parallel to each other along a first direction and spaced apart from each other by a predetermined distance and charged and collecting fine dust in the exhaust gas, And a plurality of filter bags extending in a direction parallel to the first and second dust collecting modules, the plurality of filter bags being filtered by fine dust that has not been collected by the electric dust collecting unit or fine dust that has been re- A dust collecting unit;
A dust removing unit for applying pulses to the electric dust collecting unit and the dust collecting unit to drop the fine dust collected by the electric dust collecting unit or filtered by the dust collecting unit;
A mixing unit for mixing the exhaust gas that has passed through the dust collecting unit with a reducing agent; And
And a reducing unit for selectively reducing and removing nitrogen oxides from the exhaust gas mixed with the reducing agent,
Wherein each of the first and second dust collecting modules includes a plurality of discharge electrodes for charging fine dusts alternately arranged and a plurality of dust collecting electrodes for attracting fine dust charged by the discharge electrodes,
Wherein each of the dust collecting poles includes a plane, a first end surface extending from one side of the plane to a third oblique direction, and a second end surface diverging from the other side of the plane toward the filtering dust collecting portion,
The exhaust gas moved toward the first and second dust collecting modules is moved in the first diagonal direction by the first end surface and is moved in the first diagonal direction as a whole and is removed by the first and second dust collecting modules And the fine dust that is not introduced into the filter bags is guided to move to the filter bags by the second end surface. delete delete delete The method according to claim 1,
Wherein one end and the other end of each of the discharge electrodes are connected to each other and the corona discharge is performed by a pulse applied from the outside. delete The dust collecting apparatus according to claim 1,
Further comprising a baffle plate disposed at a front end of the dust collecting unit to guide the flue gas to move to each of the first and second dust collecting modules. delete 2. The washing machine according to claim 1,
A pulse generator for generating a pulse;
A pipeline connected to the pulse generator to deliver the pulse; And
And a supply pipe connected to the pipe to supply the pulse toward the upper portion of the dust collecting unit. The apparatus according to claim 1,
A spraying part injecting a reducing agent into the exhaust gas; And
And a mixing member located below the injecting unit and mixing the reducing agent with the exhaust gas. The apparatus according to claim 1,
And a plurality of catalyst modules continuously arranged with respect to a traveling direction of the exhaust gas. 12. The method of claim 11,
Wherein each of the catalyst modules includes a plurality of blocks extending in parallel with a traveling direction of the exhaust gas,
Wherein a gap is formed between the blocks so that the exhaust gas passes through the block along the gap and the moving speed decreases to selectively reduce the nitrogen oxides. 13. The apparatus according to claim 12,
Further comprising a low-temperature plasma supplying unit for supplying a low-temperature plasma to the exhaust gas passing through the catalyst module.

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