KR20140144271A - Electrostatic precipitator - Google Patents

Abstract

INDUSTRIAL APPLICABILITY The present invention does not require an extraction device having a large capacity when collecting PM, does not cause clogging, is difficult to re-scatter even under high wind speed conditions, and exhibits high dust collection performance And provides an electrostatic precipitator with low possibility of failure. Like electrode (20) formed with a plurality of through holes for allowing PM to pass therethrough, a discharge electrode (30) disposed opposite to one surface of the plate electrode, and a voltage between the plate electrode and the discharge electrode A discharge generating section for generating a discharge to apply a coulomb force to the particulate matter, a collecting region for collecting the PM formed on the opposite side of the plate electrode to the discharge electrode, , A gas flow area (33) through which a PM-containing gas formed between the plate electrode and the discharge electrode flows, and a gas flow area (33) in which the flow of the PM gas And a PM collecting section (50) for separating and collecting the PM collected by flowing the recovering gas in a direction crossing the direction of the arrow.

Description

ELECTROSTATIC PRECIPITATOR

The present invention relates to an electrostatic precipitator for removing PM from a PM containing gas such as an exhaust gas of an internal combustion engine containing particulate matter (PM), for example.

Exhaust gas discharged from the internal combustion engine contains NOx and SOx as well as harmful substances such as PM containing carbon as a main component. It is known that humans take PM into the body by breathing, and various health damages are known to occur. Therefore, it is desired to develop a PM elimination device that efficiently removes PM.

As such a PM eliminating device, there is a method of installing a filter in an exhaust duct, but there is a problem that the filter is easily clogged and the pressure loss is large. On the other hand, the electric dust collecting apparatus is not clogged and has a small pressure loss, so that it is effective to adhere to the exhaust duct of the internal combustion engine.

14, a discharge electrode 201 and a filtration device 202 provided opposite to the discharge electrode 201 are disposed in a gas flow containing particulate matter, A high voltage power supply 203 for applying a high voltage between the discharge electrode 201 and the filtration unit 202 and a blower 204 for adjusting the flow of the gas passing through the filtration unit 202, And a main blower 205 for sucking exhaust gas are known (see, for example, Patent Document 1). Similarly, as shown in Fig. 15, the blower for blowing off 204 may be omitted, and a damper 210 for adjusting the pressure loss may be provided at each gas outlet by dividing the gas outlet into two Device is also known (see, for example, Patent Document 1).

16 and 17, a filtering apparatus 202 having a discharge electrode 201 and a counter electrode 207 provided opposite to the discharge electrode 201 in a gas stream containing particulate matter, A high voltage power source 203 for applying a high voltage between the discharge electrode 201 and the filtration device 202 and a closed space 208 closed in the filtration means 202 or on the back surface thereof are known (See, for example, Patent Document 2).

Japanese Patent Laid-Open No. H2-63560 Japanese Patent Laid-Open No. H2-184357

However, in the conventional example shown in Fig. 14 described in Patent Document 1, the exhausting amount of the gas passing through the filtration device 202 is adjusted by the blower 204 for extraction, but the filtration device 202 is a submicron order it is necessary to use fine fine particles in order to filter the particulate matter having a size of a sub micron order, so that the pressure loss by the filtration apparatus 202 becomes large, do. In this case, when the filter 202 is operated for a certain period of time, as shown in FIG. 18, the particulate matter 209 is filled up in the filtration apparatus 202 and clogging occurs, ) Need to be exchanged frequently. On the other hand, when the capacity of the blower 204 for blowing is small, the amount of air passing through the filtration device 202 is small, so that the particulate matter 209 is supplied to the vicinity of the surface of the filtration device 202 The collected particulate matter 209 is exposed to the main gas flow, and therefore, when the main gas flow is conditioned at a high wind speed, the drag force of the main gas flow (that is, The particulate matter collected on the surface of the filtration apparatus 202 is peeled off and re-dispersed by the force (drag).

Similarly, in the conventional example shown in Fig. 15 described in Patent Document 1, the blower for blowing out can be omitted. However, since the amount of compression of the filtration device 202 is adjusted by the pressure loss adjustment damper 210, As the device 202, it is necessary to use fine fine particles in order to filter particulate matter, which is the size of a submicron order, so that the pressure loss by the filtration device 202 becomes large and the pressure loss adjustment damper 210 is closed . In this case, since the pressure loss of the main gas flow by the pressure loss adjusting damper 210 becomes large, the blower 205 needs to have a large capacity. Further, as shown in Fig. 18, there is an unresolved problem that when the filter is operated for a certain period of time, clogging occurs in the filtration device 202, and dust collection becomes impossible. On the contrary, when the amount of closing of the pressure loss adjusting damper 210 is small, the capacity of the blower 205 may be small. However, since the amount of air passing through the filtering device 202 is small, The particulate matter 209 collected on the surface of the photocatalyst layer 209 is peeled off and re-scattering occurs. In addition, there is also a problem that the movable mechanism such as the pressure loss adjusting damper 210 has a very high risk of failure in a high temperature exhaust gas.

In the conventional example shown in Fig. 16 described in Patent Document 2, the secondary flow caused by the ion wind (wind) generated between the discharge electrode 201 and the counter electrode 207 is about 2 m / s at the maximum wind speed . The filtration device 202 needs to use a fine mesh sufficiently to filter the particulate matter of the size of the submicron order and since the pressure loss by the filtration device 202 is large, It is difficult for the gas to sufficiently pass through the filtration apparatus 202, and as shown in Fig. 20, the particulate matter 209 is intensively collected near the surface of the filtration apparatus 202. In this case, since the captured particulate matter is exposed to the main gas flow, the particulate matter 209 collected on the surface of the filtration apparatus 202 is peeled off by the drag force of the main gas flow when the air flow rate of the main gas flow is high There is an unresolved problem that re-scattering occurs.

Accordingly, the present invention has been made in view of the problems of the above-described conventional problems, and it is an object of the present invention to provide an air conditioner which does not require a large extraction device and is not clogged, An object of the present invention is to provide an electric dust collector which exhibits high dust collecting performance and is low in possibility of failure.

In order to achieve the above object, a first aspect of the electric dust collector according to the present invention is a dust collecting apparatus comprising: a plate electrode having a plurality of through holes for allowing particulate matter to pass therethrough; A discharge generating part for generating a discharge which applies a Coulomb force to the particulate matter by applying a voltage between the plate electrode and the discharge electrode; A collecting area for collecting particulate matter formed on the side opposite to the facing face of the discharge electrode and a particulate matter containing gas formed between the plate electrode and the discharge electrode, Containing gas in a flow direction of the particulate matter containing gas in a direction crossing the flowing direction of the particulate matter containing gas in the collecting region Peeling the bojip a particulate matter (剝離) recovering the particulate matter recovered and a portion. Then, the particulate matter in the particulate matter-containing gas is charged by the discharge, and the particulate matter in the particulate matter-containing gas is collected through the through hole and collected in the collection region, and the particulate matter collected in the collection region is separated and collected by the recovery gas.

According to such a configuration, particulate matter in the particulate matter-containing gas is charged (discharged) by discharge such as corona discharge and barrier discharge occurring between the discharge electrode and the plate-like electrode, and the through- Shaped electrodes on the opposite side of the discharge electrodes to the inside of the collecting space to be recognized in the collecting space. The collected particulate matter is peeled and recovered by a recovery gas flowing in a direction crossing the direction of flow of the particulate matter-containing exhaust gas, whereby the number of peeling of the particulate matter by the recovery gas in the flowing state of the particulate matter- It can be reliably recovered without being remarried to the substance-containing exhaust gas.

In the second aspect of the electric dust collector according to the present invention, the discharge generating portion generates a corona discharge by applying a direct current voltage between the plate electrode and the discharge electrode.

According to the second aspect, the PM particles are charged by the corona discharge occurring between the plate electrode and the discharge electrode to impart the Coulomb force.

In a third aspect of the electric dust collector according to the present invention, the discharge electrode includes a plate-shaped electrode unit main body having a rectangular cross section and a long side of the end face facing the plate electrode, And a thorn-shaped discharge portion formed on a short side of the end surface of the plate-like electrode body.

According to the third aspect, since the discharge portion of the discharge electrode is constituted by the visible discharge portion, it can be formed relatively thick. Therefore, it is easy to process and assemble, the manufacturing cost can be suppressed, and the service life can be prolonged.

In the fourth aspect of the electric dust collector according to the present invention, the extending direction of the plate-shaped electrode unit main body intersects with the flowing direction of the particulate matter containing gas.

According to the fourth aspect of the present invention, according to this configuration, since the visibility-shaped discharge portions are arranged so as not to overlap with each other in the plurality of discharge electrodes, it is possible to form the discharge- The removal rate can be improved.

In the fifth aspect of the electric dust collector according to the present invention, the discharge generating section generates an electric discharge by applying an alternating voltage between the plate electrode and the discharge electrode.

According to the fifth aspect, the PM particles are charged by the barrier discharge generated between the plate electrode and the discharge electrode to impart the Coulomb force.

In a sixth aspect of the electric dust collector according to the present invention, the discharge electrode is formed in a plate shape having a metal electrode and a dielectric covering the metal electrode, the plate having a surface along the flow direction of the particulate matter-containing gas .

According to the sixth aspect, since the metal electrode is covered with the dielectric, a barrier discharge plasma column is generated between the metal electrode and the opposing plate-shaped electrode, so that the discharge can be made silent.

In a seventh aspect of the electric dust collector according to the present invention, the discharge electrode is constituted by a heat generating resistor connected between a pair of terminals, and the particulate matter attached by applying a voltage between the pair of terminals And operates as a heater for burning.

According to the seventh aspect, the particulate matter attached to the discharge electrode can be removed by burning.

In the eighth aspect of the electric dust collector according to the present invention, two sets of the plate-like electrodes and the discharge electrodes are arranged in parallel to each other in a face-to-face relationship with each other, Thereby forming the above-mentioned collection area.

According to the eighth aspect, since two sets of plate electrodes and discharge electrodes are combined and a space is formed between the plate electrodes, it can be configured to have a narrower width than that in a case where the space is separately formed .

In the ninth aspect of the electric dust collector according to the present invention, it is preferable that the above-mentioned collecting area be formed by a pair of the plate-like electrodes facing each other, and both ends parallel to the flowing direction of the above- And is surrounded by a square tube electrode body formed of a pair of end plate portions which are closed.

According to the ninth aspect, the recovered region is surrounded by the square-shaped electrode body, and the recovered gas is passed through it, so that the recovered gas can flow through without affecting the flow state of the particulate matter containing gas.

In a tenth form of the electric dust collector according to the present invention, a cyclone dust collector is connected to one side of the collection region in the direction of the recovery gas flow direction, a suction device is connected to the cyclone dust collector, So as to form a recovery vessel stagnation.

According to the tenth aspect, since the recovery gas is formed by sucking the particulate matter, it is possible to reliably prevent the particulate matter from remarrying with respect to the particulate matter-containing gas.

In the eleventh aspect of the electric dust collector according to the present invention, a cyclone dust collector is connected to both sides of the collection region in the direction of the recovery gas flow direction, a suction device is connected to each of the cyclone dust collectors, So as to form a two-direction recovery vessel stagnation.

According to the eleventh aspect, since the recovery gas is sucked from both sides of the collection region, the collection efficiency of the particulate matter can be improved.

In the twelfth aspect of the electric dust collector according to the present invention, a suction hood for sucking the recovery gas of only the collection area is disposed between the plurality of collection areas formed between the counter electrodes and the cyclone dust collector.

According to this configuration, the recovery gas can flow only through the collection area by the suction hood, and the recovery gas can flow in the direction crossing the particulate matter-containing exhaust gas without affecting the particulate matter-containing exhaust gas. Further, since the suction position can be limited, the flow rate of the recovery gas can be suppressed, and the suction device can be downsized.

According to the present invention, it is possible to dispose the plate electrode having a plurality of through holes and the discharge electrode so as to face each other, to form a dust collection area on the side opposite to the discharge electrode of the plate electrode, Containing gas, and a voltage is applied between the plate electrode and the discharge electrode to generate discharge to charge (charge) the PM. Thereby, the PM is moved through the through hole by the Coulomb force in the holding space, and the PM is recognized in the holding space. The recovered PM can be reliably recovered without being remarried to the PM containing gas by the recovering gas flowing in the direction crossing the flow direction of the PM containing gas. In addition, it is possible to recover the PM collected in the collection area without installing the extraction blower having a large capacity. Further, it is possible to provide an electric dust collector which is hardly re-dispersed even under high wind speed conditions at the time of collecting PM, can exhibit high dust collecting performance, and is less prone to failure.

1 is a perspective view showing a part of a housing showing a first embodiment of the electric dust collector according to the present invention.
2 is a cross-sectional view taken along line A-A in Fig.
3 is a perspective view showing a discharge electrode applicable to the present invention.
Fig. 4 is a cross-sectional view of the separation suction hood on line B-B in Fig. 1;
5 is a schematic diagram showing a schematic configuration of an exhaust gas treatment system.
6 is a schematic configuration diagram showing another embodiment of the present invention.
7 is a cross-sectional view of a main part showing another embodiment of the present invention.
8 is a longitudinal sectional view showing a second embodiment of the present invention.
9 is a cross-sectional view taken along the line C-C in Fig.
10 is a side view of Fig. 8. Fig.
Fig. 11 is a view showing a discharge electrode applicable to the second embodiment. Fig. 11 (a) is an entire perspective view, and Fig. 11 (b) is a perspective view in a state in which a dielectric plate is separated.
12 is a schematic diagram showing a schematic configuration of an exhaust gas processing system to which the second embodiment is applied.
13 is a characteristic diagram showing the corona discharge characteristic.
Fig. 14 is an explanatory view showing a conventional example.
15 is an explanatory view showing another conventional example.
16 is an explanatory view showing still another conventional example.
17 is a detailed configuration diagram of the filtration apparatus of Fig.
18 is a schematic diagram showing the state of particulate matter collection in the filtration apparatus.
19 is a schematic diagram showing the re-scattering state of the particulate matter in the filtration apparatus.
20 is a schematic diagram showing the re-scattering state of the particulate matter in the filtration apparatus.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a part of a housing according to a first embodiment of the present invention. FIG.

In the figure, reference numeral 1 denotes a particulate matter (PM) having a particle diameter of 100 mu m or less and mainly composed of carbon contained in the exhaust gas of an internal combustion engine, particularly a marine diesel engine, It is an electric dust collector capable of collecting SPM (Suspended Particulate Matter).

The electric dust collector 1 has, for example, a cuboid-shaped housing 2, and a rectangular plate-shaped electrode 20, for example, in the housing 2, As shown in Fig. 2, a plurality of dust collecting electrodes 40 constituted by a set of discharge electrodes 30 opposed to each other with a predetermined gap L1.

Here, the plate electrode 20 is formed of a punching plate 22 having, for example, a plurality of circular through holes 21 extending from the surface facing the discharge electrode 30 to the surface opposite to the discharge electrode 30 on the entire surface thereof For example, the printing surface is in the vertical direction.

3, the discharge electrode 30 includes a strip-shaped electrode main body 31 having a flat rectangular cross section and extending in the horizontal direction so as to oppose the plate electrode 20, Like electrode parts 32 are formed in the upper and lower end faces on the end face side of the strip-shaped electrode main body 31 at a predetermined interval in the horizontal direction. The longer sides of the strip-shaped electrode main body 31 in the cross section are arranged parallel to the plate electrodes 20 so as to be opposed to each other.

Here, a plurality of, for example, three discharge electrodes 30 are arranged in parallel at predetermined intervals in the vertical direction.

The dust collecting electrode 40 is arranged such that two sets of the plate electrodes 20 face each other with a predetermined gap L2. The upper and lower ends of the plate electrodes 20 arranged opposite to each other are closed by the end plates 23a and 23b and the left and right end openings are opened by the plate electrodes 20 and the end plates 23a and 23b. (Square tube) electrode body 24 is formed.

Therefore, the inside of the square electrode unit 24 becomes the collecting area 25 of the PM, and a plurality of discharge electrodes 30 are provided at positions facing the plate electrodes 20 on the outside of the square- Respectively.

Therefore, in the adjacent dust collecting electrode 40, the discharge electrodes 30 are made common, and the discharge electrodes 30, the square-shaped electrode bodies 24, the discharge electrodes 30, . The number of the discharge electrodes (30) and each of the angular electrode bodies (24) is set according to the flow rate of the PM-containing exhaust gas to be subjected to dust collection processing.

A positive electrode is connected to each square electrode member 24 and a negative electrode is connected to the discharge electrode 30 between the square electrode unit 24 and the discharge electrode 30, A high voltage power source 45 for applying a high voltage as high as about 5 volts is connected and the positive electrode side of the high voltage power source 45 is grounded.

Therefore, corona discharge occurs between the square electrode unit 24 and the visible electrode unit 32 of the discharge electrode 30, and gas discharge is generated between the square electrode unit 24 and the discharge electrode 30, The PM of the PM-containing exhaust gas flowing through the region 33 is charged by corona discharge.

Then, the Coulomb force acts on the PM due to the electric field between the square-shaped electrode member 24 and the discharge electrode 30, and starts to move toward the square-shaped electrode member 24. Since PM has a mass, it passes through the through hole 21 of the square electrode body 24 as it is by the inertia force and is guided to the trapping region 25.

In the collecting region 25, since the flow field is very gentle, it is difficult for the PM to be influenced by the flow field, and PM is generated by the charge of the own electrode and the plate electrode 20 Shaped electrode 20 constituting each of the square-shaped electrode members 24, and is attached to and captured by the inner peripheral surface of the plate-shaped electrode 20.

An exhaust gas inlet 3 and an exhaust gas outlet 4 are formed on the lower surface and the upper surface of the housing 2 so as to pass the PM containing exhaust gas and are introduced into the housing 2 from the exhaust gas inlet 3. The PM containing exhaust gas passes through the gap between the plate electrode 20 and the discharge electrode 30 of the square electrode member 24 in the direction perpendicular to the extending direction of the discharge electrode 30 and flows through the exhaust gas outlet 4.

A plurality of openings 5 opposed to the inner surface of the square electrode member 24 are formed on the left end surface of the housing 2 and a recovery gas is sucked only on the inner surface side of the square electrode member 24 on the right end surface And a separation suction hood 50 as a PM collection portion is disposed. The separation suction hood 50 has a separation suction passage 52 that communicates with the inner surface of the square-shaped electrode body 24 and communicates with the suction port 51 at the other end as shown in Fig. 1, the right end face of the housing 2 and the square electrode body 24 and the separation suction hood 50 are shown separated from each other. However, in the configuration of the actual embodiment, as shown in Fig. 4, the right end face of the housing 2 and the angular electrode body 24 and the separation suction hood 50 are not spaced apart. The separation suction hood 50 is arranged in contact with the right end face of the housing 2 and the square electrode body 24.

The collection port (collection port) 61 of the cyclone dust collector 60 communicates with the suction port (suction port) 51 of the separation suction hood 50. The cyclone dust collector 60 performs solid-gas separation of the mixed fluid of the collected collected PM and the recovered gas. The cyclone dust collector 60 includes a suction port 63 formed in the upper portion of the housing 60a, A blower 64 as a suction device is connected. By operating the blower 64, as the gas is sucked from the suction port 63 of the cyclone dust collector 60 by the blower 64, the mixed fluid of the recollecting PM and the recovery gas from the recovery port 61 And the solid-gas separation is performed. The separated PM is dropped and collected in the lower PM collecting portion 62. The separated recovered gas is discharged from the suction port 63 at the upper side through the blower 64 to the exhaust gas at the lower surface side of the electric dust collector 1 And returned to the inlet (inlet 3).

In addition, since the cyclone dust collector 60 is connected to the inside collection area 25 inside the square electrode body 24 through the separation suction hood 50, by operating the blower 64, The outside air is sucked as the recovery gas from the adsorbing section 5 and the recovery gas passes through the collection area 25 in the direction orthogonal to the PM containing exhaust gas. Therefore, the PM collected in the collection area 25 is peeled off and supplied to the cyclone dust collector 60 through the separation suction hood 50 together with the recovery gas.

Next, the operation of the first embodiment will be described.

First, as schematically shown in Fig. 5, the exhaust gas inlet 3 of the housing 2 in the electric dust collector 1 is connected to a PM-containing gas discharge device 70 such as a marine diesel engine, And the exhaust gas outlet 4 of the housing 2 is likewise connected to the gas discharging portion 73 such as a chimney through a gas flow portion 72 such as a duct.

In this state, when the PM containing gas discharger 70 is operated, the PM containing exhaust gas is output from the PM containing gas discharger 70, and the PM containing exhaust gas is supplied to the housing 2 of the electric precipitator 1 (Not shown).

A high voltage is applied between the square electrode unit 24 and the discharge electrode 30 from the high voltage power source 45 to form the square electrode unit 24 from the tip of the visible electrode unit 32 of the discharge electrode 30. [ A corona discharge is generated across the gas flow-through region 33 of the PM-containing gas toward the discharge electrode 30. [

For this reason, PM contained in the PM-containing gas is charged by corona discharge. The Coulomb force acts on the PM due to the electric field between the square electrode unit 24 and the discharge electrode 30 so that the PM starts to move toward the plate electrode 20 constituting the square electrode unit 24 . Since the PM has a mass, it passes through the through hole 21 of the plate electrode 20 and is guided to the internal trapping area 25 by the inertia force.

The PM is hardly influenced by the flow field and the PM is caused by the electric potential difference between its own charge and the plate electrode 20 of the square electrode member 24 because the flow field is very gentle in the above- Receives the electric image force, moves to the inner peripheral surface of the plate-like electrode 20, and is attached and collected.

As described above, when PM is collected on the inner peripheral surface of the plate electrode 20 and the blower 64 is operated at predetermined time intervals, the outside air is sucked as the recovery gas from the opening 5 of the housing 2, The gas passes through the trapping region 25 in a direction perpendicular to the flow direction of the PM-containing exhaust gas. Therefore, the PM collected in the collection area 25 is peeled off and supplied to the cyclone dust collector 60 through the separation suction hood 50 together with the recovery gas. Here, by setting the aperture ratio of the through hole 21 of the plate electrode 20 to 20 to 40% and setting the aperture ratio of the aperture 5 to 90% or more, the through hole 21 of the plate electrode 20 The flow path resistance in the exhaust gas can be increased and the suction of the PM-containing exhaust gas by the recovery gas can be minimized. Therefore, even if the flow velocity of the recovery gas is increased, the PM-containing exhaust gas is not sucked, and PM collected on the inner peripheral surface of the plate electrode 20 can be efficiently peeled and discharged to the separation suction hood 50 .

At this time, in the separation suction hood 50, a recovery gas suction passage (separation suction passage 52) is formed only at a position opposed to the inner peripheral surface of the square-shaped electrode body 24. Therefore, since the recovery gas suction passage is not opened in the PM-containing exhaust gas passage between the square-shaped electrode members 24, it is possible to reliably prevent direct suction of the PM-containing exhaust gas.

Further, the mixed fluid of the separated PM and the recovery gas that has reached the separation suction hood 50 is introduced into the cyclone dust collector 60 from the recovery port 61, and the mixed gas is subjected to solid-gas separation. The separated PM is dropped and collected in the PM collecting part 62 at the bottom part and the recovered gas containing a part of the separated PM is sucked from the suction port 63 to the blower 64, And returned to the gas flow portion 71 near the gas inlet 3.

As described above, according to the first embodiment, since PM is collected in the trapping region 25 formed on the opposite side to the flow path of the PM-containing exhaust gas with the plate electrode interposed therebetween, , The recovered gas flows in the collection region 25 in the direction crossing the direction of flow of the PM-containing exhaust gas, so that the collected PM can be recovered without peeling the collected PM without re-marriage to the PM-containing exhaust gas have.

At this time, it is sufficient that the exhaust gas is simply passed through the gas flow path between the plate electrode 20 and the discharge electrode 30 constituting the square-shaped electrode member 24, and it is not necessary to provide a blower or the like as the addition means . In addition, since it is not necessary to provide a damper or the like which hinders the flow of the exhaust gas, the pressure loss of the exhaust gas can be reduced.

In addition, since the diameter of the through hole 21 formed in the plate electrode 20 can be formed with a relatively large diameter irrespective of the particle diameter of the PM, the pressure loss can be suppressed to a small extent. Further, the PM is recognized on the inner circumferential surface of the plate electrode 20 of the square-shaped electrode member 24 constituting the collection region 25. Therefore, it is possible to allow a large amount of PM to be accumulated depending on the surface area of the plate electrode 20, and the through hole 21 is prevented from being clogged to a great extent, There is a number.

Further, since the flow field of the trapping region 25 is small, it is difficult for the PM trapped once to re-scatter to the exhaust gas passage. In addition, since there is no movable part such as a damper or a blower in the electric dust collector 1, it is possible to obtain various effects that the possibility of failure is extremely low.

In addition, the plate electrode 20 can be formed of a punching metal, and it is unnecessary to process the plate to be rounded or folded. Thus, by connecting the upper and lower ends with the single plates 23a and 23b, 24 can be formed, and the machining cost can be greatly reduced.

Since the two sets of the discharge electrode 30 and the plate electrode 20 are arranged so that the plate electrodes face each other and the collection region 25 is formed between the plate electrodes 20, Shaped electrodes 20 and the plate-shaped electrodes 20, the space in the width direction is shortened and the width can be narrowed.

In addition, a plurality of the strip-shaped electrode bodies 31 of the discharge electrode 30 extend in the crossing direction with respect to the flowing direction of the PM-containing exhaust gas and are arranged in parallel in the flow direction. Therefore, it is possible to arrange the disposing positions of the visible discharge portions of each discharge electrode 30 in a direction orthogonal to the flowing direction of the PM-containing exhaust gas. Thereby, the corona discharge can be completely generated in the entire region in the region orthogonal to the flow direction of the PM-containing exhaust gas, and the PM removal rate of the PM-containing exhaust gas can be improved.

Further, since the discharge electrode 30 does not need to have a thin needle-like electrode portion and a relatively thick thron-shaped electrode portion 32 can be formed, it is easy to process and the life can be prolonged.

In addition, as the dust collecting electrode structure, it is also possible to arrange the discharge electrode as a bar-shaped upper portion and a plurality of needle-like electrode portions on the outer peripheral side thereof, and to arrange a cylindrical electrode portion having a plurality of through holes so as to surround the discharge electrode have. In this case, a high voltage is applied between the discharge electrode and the cylindrical electrode portion to generate a corona discharge, so that PM of the PM containing exhaust gas passing through the inner circumferential surface of the cylindrical electrode portion is charged and moved to the outside space of the cylindrical electrode. The PM collected in the collecting space is blown off by an air blow in the same direction as the flow direction of the exhaust gas containing PM, for example.

In such a configuration, most of the blown PM is not sucked from the suction port opposed to the air blow, since the PM blown in the holding space is blown by the air blow. Therefore, there is a possibility that the PM-containing exhaust gas flowing in the inside of the cylindrical electrode may be remarried and released to the atmosphere, which may reduce the recovery efficiency of the recovered PM. In addition, in order to process a large amount of exhaust gas containing PM, it is necessary to combine a plurality of electric dust collecting parts, and high assembly and installation accuracy is required. In addition, when needle electrodes are used for the discharge electrodes, there is a possibility that the lifetime is shortened as compared with the visible electrodes.

On the other hand, in the first embodiment, as described above, the dust collecting electrode can be formed with a simple structure in which the plate electrode 20 and the discharge electrode 30 are juxtaposed. The PM separated from the inner circumferential surface of the plate electrode 20 by the recovering gas is exhausted from the PM containing exhaust gas (hereinafter referred to as " PM-containing exhaust gas ") by the recovery gas in the recovery region in the direction crossing the PM- Can be reliably prevented from being remarried.

In the first embodiment, when the separation suction hood 50 is provided in one opening of one of the square electrode members 24 and the recovery gas is sucked from one side of each square electrode member 24 The present invention is not limited to the above configuration. That is, as shown in Fig. 6, as a modification of the first embodiment, a suction opening 80 (see Fig. 6) extending along the end plates 23a and 23b at the upper and lower ends of the axially central portion of the square- ). The cyclone dust collectors 60 are connected to the openings at both ends of the square electrode member 24 through the separation suction hood 50 and the blower 64 as the suction device is connected to the cyclone dust collector 60 It is acceptable.

In this case, since the recovery gas suction portion is disposed at both ends of the collection region 25, the suction effect of the recovery gas can be enhanced, and the collected PM can be more effectively peeled and recovered.

Although the case of forming the square electrode member 24 with the two plate electrodes 20 and the single plates 23a and 23b has been described in the first embodiment, But may be any cylindrical structure as long as it is opposed with an interval L2 therebetween.

In the first embodiment, the case where the two pairs of dust collecting electrodes 40 are combined to constitute the square-shaped electrode unit 24 has been described. However, only one set of dust collecting electrodes 40 , It may be configured as shown in Fig. That is, the plate-like electrode 20 and the discharge electrode 30 are opposed to each other at a predetermined interval L1 and the plate electrode 20 is sandwiched between the end portions of the end plates 23a and 23b on the side opposite to the discharge electrode 30 It is also possible to constitute the square-shaped electrode body 24 having the retention area 25 formed therein by disposing a closing plate 81 (which may also serve as a side wall of the housing 2)

In the first embodiment, the case where the flow direction of the PM-containing exhaust gas is perpendicular to the flow direction of the recovery gas has been described. However, the present invention is not limited to this, .

In the first embodiment, the case where the exhaust gas containing PM flows vertically through the bottom surface of the electric dust collector 1 in the vertical direction has been described in the first embodiment. However, the present invention is not limited to this and the separation suction hood 50) may be set to the bottom surface side so that the PM-containing exhaust gas flows in the horizontal direction, and the flow direction of the PM-containing exhaust gas can be arbitrarily set.

Next, a second embodiment of the present invention will be described with reference to Figs. 8 to 11. Fig.

In the second embodiment, the discharge generated between the discharge electrode and the plate electrode is changed from the corona discharge to the barrier discharge.

That is, in the second embodiment, the electrically conductive housing 100 of the electric dust collector 1 is formed in a rectangular parallelepiped shape as shown in Figs. 9 and 10. That is, the housing 100 has a front plate portion 101a and a rear plate portion 101b which are arranged in the longitudinal direction in the left-right direction. The housing 100 includes a top plate portion 101c and a bottom plate portion 101d connecting between the upper and lower ends of the front plate portion 101a and the back plate portion 101b and a lower plate portion 101b extending between the left and right ends of the front plate portions 101a and 101b A left side plate portion 101e and a right side plate portion 101f.

As shown in Fig. 8, the front plate portion 101a and the back plate portion 101b have rectangular openings 102a and 102b extending in the front-rear direction and are arranged at a predetermined interval L3 in the left- . The width L4 of these openings 102a and 102b is set to be narrower than the predetermined interval L3.

As shown in Fig. 8, the upper surface plate portion 101c and the lower surface plate portion 101d are provided with a rectangular plate portion 101a surrounded by the front plate portion 101a, the rear plate portion 101b, the left side plate portion 101e, The opening portions 102c and 102d are formed.

As shown in Fig. 9, the opening portion 102a of the front plate portion 101a is connected to a PM containing gas discharging device 70 such as a marine diesel engine such as the marine diesel engine described above, And an exhaust gas duct 103a, which is rectangular in shape, is connected.

An exhaust gas communication duct 103b having a rectangular cross section and connected to the above-described gas discharge portion 73 is also connected to the opening portion 102b of the back plate portion 101b.

As shown in Figs. 8 and 9, in the housing 100, between the positions excluding the openings 102a and 102b of the front plate portion 101a and the back plate portion 101b, Five square-shaped electrode bodies 110 having the same configuration as the square-shaped electrode body 24 are arranged in parallel. Therefore, the square-shaped electrode bodies 110 are arranged at a predetermined interval which is the same as the width L4 of the openings 102a and 102b in the direction perpendicular to the exhaust gas flow direction along the exhaust gas flow direction.

These square-shaped electrode bodies 110 are formed in a rectangular parallelepiped shape having upper and lower surfaces opened as shown in Fig. On the left and right side surfaces of the square-shaped electrode member 110, the plate electrodes 112a and 112b are arranged so that their outer surfaces are spaced apart from each other by a predetermined distance L3. Each of the plate electrodes 112a and 112b is formed by punching a plurality of circular through holes 113 formed on the entire surface in the same manner as the plate electrode 20 in the first embodiment described above Plate 114, and is disposed so as to extend in the front-rear direction, that is, the exhaust gas flow direction so that the plate surface is vertical.

An angular electrode member 115 having a plate electrode 112c formed on a surface facing the square electrode member 110 at a predetermined interval L4 is disposed outside the square electrode members 110 at both ends of the left and right ends have. These square-shaped electrode bodies 115 are also formed in the shape of a rectangular parallelepiped having upper and lower surfaces opened like the square-shaped electrode bodies 110.

As shown in Fig. 8, on the upper end sides of the square electrode bodies 110 and 115, a recovery gas inlet port (hereinafter referred to as " Intake ports 116 are formed.

The space between the square-shaped electrode members 110 and the square electrode unit 110 and the square electrode unit 115 is filled with the gas flow area 117 through which the exhaust gas supplied from the exhaust gas flow duct 103a flows backward. Respectively. The discharge electrodes 120 are individually disposed on the plate electrodes 112a and 112b and 112c and 112a and 112b and 112c at the central portions in the left and right directions of the gas flow area 117, respectively.

The discharge electrode 120 is formed into a rectangular plate shape along the exhaust gas flow direction. 11, the discharge electrode 120 has a structure of a ceramic heater having a heat generating resistor 122 formed in a meandering manner on a plane embedded in a ceramic 121 of alumina or silicon nitride as a dielectric, . Terminal connection pads 123a and 123b are formed at the starting end and the terminal end of the heat generating resistor 122 at the front and rear positions above the heat generating resistor 122. The terminal connection pads 123a and 123b are connected to the lead terminals 124a and 124b by soldering or the like. That is, the discharge electrode 120 has a structure in which the heat generating resistor 122 is covered with the ceramics 121 as a dielectric.

Each of the discharge electrodes 120 includes a heat-resistant insulating spacer 125 disposed on the opening 102c side of the upper surface plate portion 101c of the housing 2, Heat insulating spacers 126 disposed between the lower ends of the interdental electrodes 115 and 110 and the lower ends between the angular electrode bodies 110 and the angular electrode bodies 115.

8 and 9, lead terminals 124a and 124b of each discharge electrode 120 are connected to a high voltage supporter disposed on the left and right end sides of the top plate portion 101c of the housing 2, Voltage power supply bars 128a and 128b bridged parallel to each other at a predetermined distance in the front-rear direction between the upper and lower power supply bars 127a and 127b by a pressure spring 129 Are electrically connected.

As shown in Fig. 9, a barrier discharge generating portion 130 as a discharge generating portion is connected to the high-pressure feeding bars 128a and 128b. The barrier discharge generating part 130 includes a high voltage power relay 131 connected between the high voltage power supply bars 128a and 128b and a connection point between one end of the high voltage power supply relay 131 and the high voltage power supply bar 128a And a series circuit of a high voltage power relay 132 connected between the ground and the high voltage AC power source 133 for generating a high voltage alternating current of, for example, 10 kV. Further, the high-voltage AC power supply 133 and the ground are connected to the housing 100.

9, a heating control section 135 is connected to the high-pressure feeding bars 128a and 128b. The heating control unit 135 is connected to the high-voltage power supply bars 128a and 128b by a low-voltage AC power supply 138 for generating a low-voltage alternating current, for example, of about 54 V connected to the high- .

Voltage AC power is output from the high voltage AC power source 133 and the high voltage power relays 131 and 132 are biased in the on state so that the high voltage alternating current is supplied to the discharge electrode 120 And is applied between the plate electrodes 112a to 112c. As a result, a barrier discharge plasma column is generated between the discharge electrode 120 and the plate electrodes 112a to 112c.

Between the discharge electrode 120 and the plate electrodes 112a to 112c, exhaust gas containing PM particles flows. Therefore, the PM contained in the PM particle-containing exhaust gas is charged (charged) when passing through the barrier discharge plasma column, and the Coulomb force is given to the electric field generated by the barrier discharge sustaining voltage, 112c. In addition, not all of the PM to which the coulomb force is applied is directed to the plate electrodes 112a to 112c, and a part of the PM is directed to the discharge electrode 120 in some cases.

The PM toward the plate electrodes 112a to 112c is collected in the square electrode body 110 from the through holes 111 formed in the plate electrodes 112a to 112c.

The PM attached to the discharge electrode 120 periodically releases the bias state of the high voltage power relays 131 and 132 and stops applying the high voltage AC to the discharge electrode 120, Voltage alternating current is applied to the lead terminals 124a and 124b of the discharge electrode 120 with the power relays 136 and 137 being in a bias state to operate the discharge electrode 120 as a ceramic heater. As a result, the discharge electrode 120 is heated to about 800 DEG C within about one to two minutes, and the PM attached to the surface is completely burned and removed.

The suction hood 140 is connected to the opening 102c formed in the bottom plate portion 101d of the housing 100. [ The suction hood 140 is communicated only to the opening 118 of the bottom portion of each of the square-shaped electrode bodies 110 and 115 and is separated from the gas communicating region 117 by the heat-insulating spacer 126.

A suction port 141 of the suction hood 140 communicates with a recovery port 61 of the cyclone dust collector 60, although not shown, like the first embodiment described above. A blower 64 as a suction device is connected to the suction port 63 formed in the upper portion of the housing 60a. By operating the blower 64, the gas is sucked from the suction port 63 of the cyclone dust collector 60 by the blower 64, and the mixed fluid of the collected PM and the recovering gas is discharged from the recovery port 61 Suction and solid-gas separation. The separated PM is dropped and collected in the downward PM collecting section 62. The separated recovered gas is discharged from the upper suction port 63 through the blower 64 to the front side of the electric dust collector 1 And returned to the exhaust gas flow duct 103a.

Next, the operation of the second embodiment will be described.

12, the exhaust gas communication duct 103a connected to the housing 100 of the electric dust collector 1 is connected to a PM-containing gas discharge device 70 such as a marine diesel engine And the exhaust gas passage duct 103b connected to the housing 100 is connected to a gas discharge portion 73 such as a chimney.

In this state, a high-voltage alternating current of, for example, 10 kV is generated by the high-voltage alternating-current power supply 133 of the barrier discharge generating section 130 of the electric precipitator 1 and the high-voltage regulating relays 131 and 132 are brought into a biased state The high voltage alternating current generated in the high voltage AC power supply 133 is applied between the discharge electrode 120 and the alternating current electrode bodies 110 and 115 serving as the ground electrodes through the high voltage feeding bars 128a and 128b.

As a result, a barrier discharge plasma column is generated between the discharge electrode 120 and the plate electrodes 112a to 112c of the square-shaped electrode bodies 110 and 115, and a barrier discharge is generated. This barrier discharge is a silent discharge in which no spark occurs because the heat generating resistor 122 in which the discharge electrode 120 serves as an electrode is covered with the ceramics 121 as a dielectric.

In the state in which the barrier discharge is occurring, the exhaust gas containing PM particles flows between the discharge electrode 120 and the plate electrodes 112a to 112c. Then, the PM contained in the PM particle-containing exhaust gas is charged at the time of passing through the barrier discharge plasma column, and the Coulomb force is given to the electric field generated by the barrier discharge sustaining voltage to make the side of the plate electrodes 112a to 112c I'm headed. In addition, not all of the PM to which the coulomb force is applied is directed to the plate electrodes 112a to 112c, and a part of the PM is directed to the discharge electrode 120 in some cases.

The PMs directed to the plate electrodes 112a to 112c are guided from the through holes 111 formed in the plate electrodes 112a to 112c to the collection area in the square electrode bodies 110 and 115 in the same manner as in the first embodiment, do.

Since the flow field is very gentle in the retention area, PM is difficult to be influenced by the flow field, and PM is caused by the potential difference between the charge of the PM itself and the plate electrodes 112a to 112c of the square electrode bodies 110 and 115 Receives the electric image force, moves to the inner circumferential surface of the plate electrodes 112a to 112c, and is attached thereto.

When the blower 64 is operated intermittently every predetermined time while the PM is collected on the inner circumferential surface of the plate electrodes 112a to 112c as described above, the air from the recovery gas inlet 116 of the housing 100 Is sucked as a recovered gas. The recovered gas passes through the collecting region of the square-shaped electrode bodies 110 and 115 in a direction orthogonal to the flowing direction of the PM-containing exhaust gas. Therefore, the PM collected in the collection area is peeled off and supplied to the cyclone dust collector 60 through the suction hood 140 together with the recovery gas.

The opening ratio of the through holes 113 of the plate electrodes 112a to 112c is set to 20 to 40% and the aperture ratio of the recovery gas intake port 116 of the square electrode bodies 110 and 115 is set to 90% It is possible to minimize the suction of the PM-containing exhaust gas by the recovery gas by increasing the flow path resistance in the through hole 21 of the plate electrode 20. [ Therefore, even if the flow velocity of the recovery gas is increased, the PM-containing exhaust gas is not sucked, and PM collected on the inner circumferential surfaces of the plate electrodes 112a to 112c can be efficiently peeled and discharged to the suction hood 140 have.

At this time, in the suction hood 140, the gas flow area 117 is closed by the heat-resistant insulating spacer 126, and only the bottom surfaces of the square-shaped electrode bodies 110 and 115 are communicated. Therefore, direct suction of the PM-containing exhaust gas flowing through the gas passage region 117 by the suction hood 140 can be reliably prevented.

Further, the mixed fluid of the separated PM and the recovered gas reaching the suction hood 140 is introduced into the cyclone dust collector 60 from the suction port 141, and the mixed gas is subjected to solid-gas separation. The separated PM is dropped and collected in the PM collecting part 62 at the bottom part and the recovered gas containing a part of the separated PM is sucked from the suction port 63 to the blower 64 and connected to the housing 100 And returns to the vicinity of the opening 102a of the exhaust gas passage duct 103a.

On the other hand, as the high-voltage-power relays 131 and 132 of the discharge generating section 130 are returned from the bias state to the non-bias state every predetermined time, the supply of the high-voltage AC to the high-voltage power supply bars 128a and 128b Is stopped.

In this state, the high-voltage power relays 136 and 137 of the heating control unit 135 are in a bias state, and a low-voltage alternating current output from the low-voltage alternating-current power supply 138 is supplied to the high- voltage feeding bars 128a and 128b. The low voltage alternating current supplied to the high voltage feeding bars 128a and 128b is applied to the terminal connection pads 123a and 123b at both ends of the heat generating resistor 122 through the lead terminals 124a and 124b of the respective discharge electrodes 120 do. Therefore, since the discharge electrode 120 operates as a ceramic heater, the surface temperature is heated to 400 占 폚 to 800 占 폚 within one to two minutes.

Therefore, the PM attached to the surface of the ceramics 121 of the discharge electrode 120 is completely burned and removed.

As described above, according to the second embodiment, a barrier discharge plasma column is formed between the discharge electrode 120 and the plate electrodes 112a to 112c to generate a barrier discharge. At this time, The heat generating resistor 122 is covered with a ceramics 121 as a dielectric. Therefore, the discharge current flows from the heat generating resistor 122 through the ceramics 121 and becomes a silent discharge which does not cause sparking until the ceramics 121 itself is insulated.

Further, since the heat resistance temperature of the ceramic 121 can withstand 400 ° C to 800 ° C to operate as a heater, even if the temperature of the PM-containing exhaust gas exceeds 300 ° C, the electric dust collection without sparking can be performed.

When a corona discharge is generated between the discharge electrode 30 and the plate electrode 20 as in the first embodiment, the discharge characteristics are as shown in Fig. 13, the spark discharge voltage is represented by a characteristic line L11, the corona discharge starting voltage is represented by a characteristic line L12, and the gas density ratio is represented by a characteristic line L13.

13, when the corona discharge is used, the spark discharge voltage does not drop so much if the PM-containing exhaust gas temperature is 150 DEG C or less, but when it exceeds 150 DEG C, the spark discharge voltage The rate of decrease is increased.

On the other hand, when the corona discharge start voltage is inversely lower than the voltage drop rate of 150 ° C over 150 ° C, the voltage drop rate becomes smaller. The corona discharge start voltage at which the exhaust gas temperature is about 250 ° C, ) Of the corona discharge starting voltage.

Therefore, in the case of using the corona discharge, since the spark discharge voltage is lowered when the exhaust gas temperature exceeds 250 DEG C, there is a limitation in increasing the corona discharge voltage in order to avoid sparks, The voltage is lowered, the Coulomb force given to the PM is weakened, and the dust collecting performance is lowered.

However, when the barrier discharge is employed as in the second embodiment, since the electrode portion of the discharge electrode 120 is covered with the ceramics 121, which is a dielectric, spark discharge is unlikely to occur and even if the temperature of the PM- The dust collecting performance is not lowered, and a good dust collecting effect can be obtained.

In addition, the opposed area between the discharge electrode 120 and the plate electrodes 112a to 112c can be widened, and it is possible to prevent the ion shower column from being generated in the ion shower column in the case of the corona discharge in the first embodiment The density of the barrier discharge plasma column can be increased, and the dust collecting efficiency can be improved.

In the second embodiment, a ceramic heater is used as the discharge electrode 120. However, the present invention is not limited to this, and a ferroelectric such as barium titanate may be used as the dielectric covering the flat plate electrode It can also be applied. That is, any dielectric material can be applied as long as the dielectric material has high heat resistance.

In the second embodiment, the flow direction of the recovery gas for recovering the collected PM is orthogonal to the flow direction of the PM-containing exhaust gas. However, the present invention is not limited to this, So that the gas and the recovered gas flow in a direction crossing each other.

In the second embodiment, the flow direction of the PM-containing exhaust gas is not limited to the horizontal direction but may be any direction including the vertical direction. Also in the second embodiment, a pair of suction hoods may be arranged to face each other and a recovery gas intake port may be provided in the housing 100 in the middle part as in the case of Fig. 6 in the first embodiment described above.

In the first and second embodiments, the blower 64 is applied as the suction device. However, the present invention is not limited to this, and another suction device such as a vacuum ejector can be applied.

In the first and second embodiments, the PM contained in the exhaust gas discharged from the diesel engine is removed. However, the present invention is not limited to this, and PM may be removed from any PM-containing gas .

(Industrial availability)

According to the present invention, there is no need for a large extraction device, no clogging occurs, it is difficult to re-disperse even under high wind speed conditions, high dust collection performance is exhibited, A low electric dust collecting device can be provided.

One; Electric dust collector
2; housing
3; Gas inlet
4; Gas outlet
5; Opening
20; Plate-shaped electrode
21; Through hole
22; Punching metal
23a, 23b; End plate
24; Square cylinder electrode body
30; Discharge electrode
31; The strip-
32; A thorn-shaped electrode portion
33; Gas flow area
40; Dust collecting electrode
50; Separation suction hood
60; Cyclone dust collector
62; The PM collection unit
64; Blower
100; housing
103a, 103b; Exhaust gas flow duct
110, 115; Square-
112a-112c; Plate-shaped electrode
117; Gas flow region
120; Discharge electrode
121; Ceramics
122; Heating resistor
124a, 124b; Lead terminal
128a, 128b; High-voltage power supply bars
130; A barrier discharge generator
131, 132; High-voltage power relay
133; High-voltage AC power source
135; Heating control unit
136, 137; High-voltage power relay
138; Low-voltage AC power source

Claims (12)

Like electrode having a plurality of through holes for allowing particulate matter to pass therethrough; a discharge electrode arranged opposite to one surface of the plate electrode;
A discharge generating unit for applying a voltage between the plate electrode and the discharge electrode to generate a discharge for applying a coulomb force to the particulate matter;
A collecting region for collecting and collecting the particulate matter formed on the side opposite to the side facing the discharge electrode of the plate electrode,
A gas flow region through which the particulate matter-containing gas formed between the plate electrode and the discharge electrode flows,
And a particulate matter recovery unit for separating and recovering the particulate matter collected by passing the recovery gas through the collection area in a direction crossing the direction of flow of the particulate matter containing gas in the flowing state of the particulate matter containing gas,
The particulate matter in the particulate matter-containing gas is charged by the discharge, the particulate matter in the particulate matter-containing gas is collected through the through hole, and the particulate matter collected in the collection region is separated and recovered by the recovery gas
Wherein the electric dust collecting device is an electric dust collecting device. The method according to claim 1,
Wherein the discharge generating unit generates a corona discharge by applying a DC voltage between the plate electrode and the discharge electrode. 3. The method of claim 2,
The discharge electrode includes a plate-shaped electrode unit main body having a rectangular cross section and a long side of the plate section facing the plate-shaped electrode, and a discharge electrode formed on the short side of the end surface of the plate- Shaped discharging portion for discharging the electrostatic precipitator. The method of claim 3,
Wherein the extending direction of the plate-shaped electrode unit main body crosses the flowing direction of the particulate matter containing gas. The method according to claim 1,
Wherein the discharge generating unit generates a barreling discharge by applying an AC voltage between the plate electrode and the discharge electrode. 6. The method of claim 5,
Wherein the discharge electrode is formed in a plate shape having a metal electrode and a dielectric covering the metal electrode and having a plate surface extending in the flowing direction of the particulate matter containing gas. The method according to claim 6,
Wherein the discharge electrode is constituted by a heat generating resistor connected between a pair of terminals and operates as a heater for burning particulate matter deposited by applying a voltage between the pair of terminals. The method according to claim 1,
Wherein a plurality of sets of the plate electrodes and the discharge electrodes are arranged in parallel with each other so that the plate electrodes face each other and the collection area is formed between the plate electrodes facing each other, . The method according to claim 1,
Wherein the collecting region includes a pair of plate electrodes facing each other and a pair of end plate portions (end plate portion, end plate portion, and end plate portion) for closing both end portions parallel to the flowing direction of the recovery gas of the pair of plate electrodes, end plate portions at least in a direction perpendicular to the longitudinal direction of the electric dust collecting apparatus. 10. The method of claim 9,
A cyclone dust collector is connected to one side of the collecting area in the recovery gas flow direction, a suction device is connected to the cyclone dust collector, and a retentate stagnant is formed by the suction force of the suction device Electric dust collector. 10. The method of claim 9,
A cyclone dust collector is connected to both sides of the collection region in the direction of the recovery gas flow direction, a suction device is connected to each of the cyclone dust collectors, and a two-direction recovery flow is formed by the suction force of the suction device Lt; / RTI > The method according to claim 10 or 11,
And a suction hood for sucking the recovery gas of only the collection area is disposed between the plurality of collection areas formed between the counter electrodes and the cyclone dust collector.

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