JP2978481B1 - Electric dust collector - Google Patents

Abstract

The present invention provides an electrostatic precipitator capable of reducing pressure loss of gas caused by an electrode. SOLUTION: A plurality of charging portion electrodes 22 extending in parallel with the flow direction B are provided in a flow channel 29 at intervals in a direction perpendicular to the flow direction B. Downstream from each charging unit electrode 22, a plurality of flat plates extending in parallel with the flow direction B at intervals in the direction perpendicular to the flow direction B and shifted from the charging unit electrode 22 in the vertical direction. Dust collector electrode 23
Is provided. An AC corona discharge is generated between the projection 40 of the charging unit electrode 22 and the end 39 of the dust collecting unit electrode 23 on the upstream side in the flow direction B by the corona discharge power supply 24.
By using the dust collecting portion electrode as an electrode for generating corona discharge in this way, it is not necessary to separately provide a counter electrode for corona discharge, and the pressure loss of gas can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric precipitator for collecting particulate matter to be collected by electric action.

[0002]

2. Description of the Related Art FIG. 13 is a sectional view schematically showing a conventional electric precipitator 1. Techniques related to the electrostatic precipitator 1 are disclosed in, for example, JP-A-10-28897 and JP-A-3-232554. The electric precipitator 1 includes a flow path formed by the housing 10,
Gas containing particulate matter such as dust is passed by a blower (not shown) for flowing the gas. The charging section 2 and the dust collection section 3 are provided in this gas flow path in order from the upstream side in the gas flow direction A. The charging unit 2 is provided with a discharge electrode 4 and a counter electrode 5. The discharge electrode 4 is supplied with a potential having an amplitude voltage centered on a ground potential by an AC power supply 6, and the counter electrode 5 is grounded. I have. In the charging section 2, corona discharge is generated from the discharge electrode 4 toward the counter electrode 5, and the particulate matter in the gas passing through the discharge region 11 between the electrodes 4, 5 is charged. Dust collection unit 3
Is provided with a first electrode 7 and a second electrode 8, a potential lower than a ground potential is applied to the first electrode 7 by a DC power supply 9, and the second electrode 8 is grounded. This dust collecting part 3
Then, an electric field is formed between the first electrode 7 and the second electrode 8, and the particulate matter charged by the charging section 2 receives a force from the electric field and is applied to the first or second electrode 7, 8. Collected.

[0003]

In such an electrostatic precipitator 1, the charging section 2 has the discharge electrode 4 and the counter electrode 5, and the number of electrodes of the charging section 2 increases. Dust collection unit 3
The electrodes 4, 5; 7, 8 including the above-mentioned electrodes have resistance to the flow of gas, so that pressure loss occurs and the load on the blower increases. The charging section 2 also has a counter electrode 5 grounded, so that the charged particulate matter can be collected on the counter electrode 5. However, since a positive and negative potential is alternately applied to the discharge electrode 4, However, the particulate matter once charged and collected on the counter electrode 5 is neutralized and scatters from the counter electrode 5, and the dust collection efficiency is reduced.

Accordingly, an object of the present invention is to provide an electric precipitator capable of reducing the gas pressure loss caused by the electrodes. Another object of the present invention is to provide an electrostatic precipitator capable of preventing the occurrence of a static elimination effect in a charging section even when a voltage is applied to a charging section electrode by an AC power supply.

[0005]

According to a first aspect of the present invention, there is provided a fuel cell system in which a gas containing particulate matter to be collected is arranged at intervals in a direction perpendicular to the flow direction of the channel. A charging unit electrode, and a space downstream of the charging unit electrode in the flow path, perpendicular to the flow direction of the flow path, and displaced from the charging unit electrode in the vertical direction. A corona discharge power supply for generating a corona discharge between a first dust collecting portion electrode having a flat plate shape extending in a direction, and a flow direction upstream end of the charging portion electrode and the first dust collecting portion electrode; ,
Downstream of the flow path from the charging unit electrode, the first dust collecting unit electrode is disposed between the vertical directions, and extends in the flow direction in a flat plate-like second dust collecting unit electrode; A power source for forming an electric field for forming a DC electric field between the two dust collecting portion electrodes; a power source for corona discharge is an AC power source; the first dust collecting portion electrode is grounded; An electrostatic precipitator having an output voltage having an absolute value less than an amplitude voltage of a discharge power supply.

According to the present invention, a charging section electrode arranged at intervals in a direction perpendicular to a flow direction of a flow path of a gas, and a flow path of the flow path downstream of the flow path from the charging section electrode. A first dust collecting portion electrode arranged at intervals in a direction perpendicular to the direction, and a corona discharge is generated between the charging portion electrode and the upstream end of the first dust collecting portion electrode in the flow direction. Generated.
This makes it possible to use the first dust collecting portion electrode as an electrode for generating corona discharge, without requiring a counter electrode for discharge provided in a conventional device, and reducing the number of electrodes. Can be reduced. Therefore, the pressure loss of the gas can be reduced. Further, by disposing the first dust collecting portion electrode downstream of the charging portion electrode in the gas flow direction, the charging portion electrode and the first dust collecting portion electrode are partially overlapped in the direction perpendicular to the gas flow direction. As compared with the case where the electrodes are arranged in a vertical direction, the portion in which the electrodes in the gas flow path are densely arranged is eliminated, thereby preventing an increase in gas pressure loss. Further, since the number of electrodes can be reduced, the configuration of the electric precipitator can be simplified, the production cost can be reduced, and the production can be facilitated. Further, the dust collecting portion electrode is arranged to be shifted from the charging portion electrode in the direction perpendicular to the gas flow direction, and can form a corona discharge region crossing the gas flow direction. As a result, even if corona discharge is generated using the dust collecting electrode disposed downstream of the charging section electrode, the gas passes across the corona discharge area, so that the particulate matter contained in the gas can be reliably removed. Can be charged. Further, a second dust collecting portion electrode is arranged between the first dust collecting portion electrodes, and a DC electric field is formed between the first and second dust collecting portion electrodes by an electric field forming power supply. The charged particulate matter is collected on one of the first and second dust collecting electrodes by the Coulomb force of the dust collecting electrode. At this time, different electric potentials are applied to the first and second dust collecting portion electrodes, and a large coulomb is applied to the particulate matter as compared with the case where the first and second dust collecting portion electrodes have the same potential. Force acts. Therefore, the particulate matter can be reliably collected.

[0007] Even in a configuration in which corona discharge is generated by the charging unit electrode and the dust collecting unit electrode arranged as described above, fine particulate matter can be suitably collected from gas. In addition, the dust collecting portion electrode is a plate-shaped electrode, and can obtain a large dust collecting area, and is arranged along the gas flow direction. Therefore, even if the dust collecting area is increased, the gas pressure loss is reduced. A large drop is prevented. In addition, since the particulate matter is collected only at the dust collecting portion electrode disposed downstream of the corona discharge region in the gas flow direction, even if an AC power supply is used as the corona discharge power source, the particulate matter is once charged and collected. The particulate matter collected on the electrodes is not discharged by AC corona discharge, and can be collected with high dust collection efficiency. Of course, a DC power supply can be used as the power supply for corona discharge, and the degree of freedom in selecting a power supply that can be used as the power supply for corona discharge increases, and the degree of freedom in designing the electric dust collector increases.

The power supply for corona discharge is an AC power supply, a commercial power supply can be used, and power can be easily obtained. Further, the first dust collecting portion electrode is grounded, and the particulate matter contained in the gas is positively and negatively charged alternately, and the positively charged particulate matter is
The negatively charged particulate matter collected at the low-potential-side dust collecting electrode of the first and second dust-collecting electrodes is collected at the high-potential side of the first and second dust collecting electrodes. Collected on the electrodes. As a result, the particulate matter can be collected by both the first and second dust collecting portion electrodes, and the particulate matter charged positively or negatively by using a DC power supply as a corona discharge power supply can be collected by the first and second dust collection parts. As compared with the case where only one of the electrodes of the second dust collecting unit collects dust, the dust collecting area can be made larger and more particulate matter can be collected. Further, since the electric field forming power supply has an output voltage having an absolute value less than the amplitude voltage of the corona discharge power supply, it is possible to prevent the voltage between the charging unit electrode and the second dust collecting unit electrode from becoming too large. In this case, the second dust collecting portion electrode is arranged as close to the charging portion electrode as possible, so that the region facing the first dust collecting portion electrode can be widened, and the electric field forming region can be widened. Therefore, the dust collection efficiency can be improved without increasing the size of the device.

According to a second aspect of the present invention, there is provided a charging section electrode disposed in a flow path through which a gas containing particulate matter to be collected flows at a distance in a direction perpendicular to a flow direction of the flow path;
Downstream of the flow path from the charging unit electrode, spaced apart in the vertical direction to the flow direction of the flow path, and the charging unit electrode is arranged to be shifted in the vertical direction and extends along the flow direction -Shaped first dust collector electrode, downstream of the flow path than the charging unit electrode, between the vertical direction of the first dust collector electrode,
The charging unit electrode is disposed to be shifted in the vertical direction, and extends in the flow direction. The plate-shaped second dust collection unit electrode, and the charging unit electrode and the first and second dust collection unit electrodes in the flow direction upstream. A power supply for corona discharge that generates corona discharge, and a power supply for forming an electric field that forms a DC electric field between the first and second dust collection portion electrodes, between the end of the corona discharge and the power supply for corona discharge. ,
An AC power supply, wherein the first dust collector electrode is grounded, the electric field forming power source has an output voltage having an absolute value less than the amplitude voltage of the corona discharge power source, and the first and second dust collector electrodes Is an electrostatic precipitator characterized by applying voltages of opposite polarities to each other.

According to the present invention, the charging section electrodes arranged at intervals in the direction perpendicular to the flow direction of the gas flow path, and the flow path of the flow path downstream of the flow path from the charging section electrode. A first dust collecting portion electrode disposed at intervals in a direction perpendicular to the first direction, a second dust collecting portion electrode disposed between the first dust collecting portion electrodes downstream of the flow path from the charging portion electrode, and And a corona discharge is generated between the charging unit electrode and the upstream end of the first and second dust collecting unit electrodes in the flow direction. Thereby, it is possible to use the first and second dust collecting portion electrodes as electrodes for generating corona discharge, without requiring a counter electrode for discharge provided in a conventional device, The number of electrodes can be reduced. Therefore, the pressure loss of the gas can be reduced, and the operation efficiency can be improved. Further, by arranging the first and second dust collecting portion electrodes downstream of the charging portion electrode in the gas flow direction, the charging portion electrode and the first and second dust collecting portion electrodes are perpendicular to the gas flow direction. Compared with the case where the electrodes are partially overlapped in the direction, the portion in which the electrodes in the gas flow path are densely arranged is eliminated, thereby preventing the gas pressure loss from increasing. Further, since the number of electrodes can be reduced, the configuration of the electric precipitator can be simplified, the production cost can be reduced, and the production can be facilitated.

[0011] Further, the dust collecting portion electrode is provided with respect to the charging portion electrode.
The corona discharge region is arranged so as to be displaced in the direction perpendicular to the gas flow direction and crosses the gas flow direction. Even if a corona discharge is generated by using the dust collecting electrode arranged downstream of the charging unit electrode by this,
Since the gas passes across the corona discharge region, the particulate matter contained in the gas can be reliably charged. A DC electric field is formed between the first and second dust collecting portion electrodes by an electric field forming power supply. The charged particulate matter is collected on one of the first and second dust collecting electrodes by the Coulomb force of the dust collecting electrode. At this time, different electric potentials are applied to the first and second dust collecting portion electrodes, and a large coulomb is applied to the particulate matter as compared with the case where the first and second dust collecting portion electrodes have the same potential. Force acts. Therefore, the particulate matter can be reliably collected.

As described above, even in a configuration in which the corona discharge is generated by the charging unit electrode and the dust collecting unit electrode arranged as described above, the particulate matter can be appropriately collected from the gas. In addition, the dust collecting portion electrode is a plate-shaped electrode, and can obtain a large dust collecting area, and is arranged along the gas flow direction. Therefore, even if the dust collecting area is increased, the gas pressure loss is reduced. A large drop is prevented.

Further, since the particulate matter is collected only on the dust collecting portion electrode located downstream of the corona discharge region in the gas flow direction, even if an AC power supply is used as the corona discharge power supply, the particulate matter is once charged. The particulate matter collected in the dust collecting part electrode is not discharged by AC corona discharge, and can be collected with high dust collection efficiency. Of course, a DC power supply can be used as the power supply for corona discharge, and the degree of freedom in selecting a power supply that can be used as the power supply for corona discharge increases, and the degree of freedom in designing the electric dust collector increases. Further, the power supply for corona discharge is an AC power supply, a commercial power supply can be used, and power can be easily obtained. Further, voltages of opposite polarities are respectively applied to the first and second dust collecting portion electrodes by the electric field forming power supply, and corona discharge between the charging portion electrode and the first dust collecting portion electrode, and the charging portion electrode and the first dust collecting portion electrode. A corona discharge having a polarity opposite to that of the corona discharge between the second dust collecting portion electrodes is generated. As a result, the particulate matter passing between the charging electrode and the first dust collecting part electrode and the particulate matter passing between the charging part electrode and the second dust collecting part electrode are charged with opposite polarities. . The positively charged particulate matter is collected on the lower potential side of the first and second dust collector electrodes, and the negatively charged particulate matter is collected on the first and second dust collector electrodes.
It is collected on the high-potential-side dust collecting portion electrode of the dust collecting portion electrodes.
As a result, the particulate matter can be collected by both the first and second dust collecting portion electrodes, and the particulate matter charged positively or negatively by using a DC power supply as a corona discharge power supply can be collected by the first and second dust collection parts. As compared with the case where only one of the electrodes of the second dust collecting unit collects dust, the dust collecting area can be made larger and more particulate matter can be collected. In addition, since corona discharges of opposite polarities are generated in mutually different regions, fine particles charged with mutually opposite polarities flow through regions deviated in a direction perpendicular to the gas flow direction. Become like Therefore, it is possible to prevent the particulate matter charged in opposite polarities from coming into contact with each other and being mutually neutralized. Further, since the power supply for forming an electric field has an output voltage having an absolute value smaller than the amplitude voltage of the power supply for corona discharge, the voltage between the first and second dust collecting portion electrodes becomes too large, and the first and second collecting powers become large. Even when the particulate matter is unevenly collected on the dust electrode, no spark discharge is generated from the particulate matter.

According to a third aspect of the present invention, there is provided a flow path in which a gas containing particulate matter to be collected flows, which is arranged at intervals in a direction perpendicular to the flow direction of the flow path. A charging section electrode having a plurality of substantially triangular protrusions formed at an end on the downstream side in the flow direction, the charging section electrode being downstream of the flow path than the charging section electrode, At intervals in the direction perpendicular to the flow direction of the flow path, and the charging unit electrode is disposed to be shifted in the vertical direction and extends in the flow direction. A corona discharge power supply that generates a corona discharge between the tip of the projection and the end of the dust collecting portion electrode on the upstream side in the flow direction,
Each of the protrusions is inclined in one direction in the thickness direction of the charging unit electrode, and is a first protrusion that protrudes toward one side of two dust collecting unit electrodes adjacent to the charging unit electrode, and the other side in the thickness direction of the charging unit electrode. And a second protrusion protruding toward the other of the two dust collecting portion electrodes adjacent to the charging portion electrode. The first and second protrusions are formed alternately, and the first and second protrusions are mutually adjacent. 1
An electrostatic precipitator is characterized in that corona discharge generated from the projection and the second projection is prevented from interfering with each other.

[0015] According to the present invention, the charging portion electrodes arranged at intervals in the direction perpendicular to the flow direction of the gas flow channel, and the flow path of the flow channel downstream of the charging portion electrode from the charging portion electrode. And a dust collecting portion electrode arranged at intervals in the direction perpendicular to the direction, and a corona discharge is provided between the tip of each projection of the charging portion electrode and the upstream end of the dust collecting portion electrode in the flow direction. Is generated. Thereby, the dust collecting portion electrode can be used as an electrode for generating corona discharge, and the counter electrode for discharge provided in the conventional device is not required, and the number of electrodes is reduced. be able to. Therefore, the pressure loss of the gas can be reduced. Further, by arranging the dust collecting section electrode downstream of the charging section electrode in the gas flow direction, the charging section electrode and the dust collecting section electrode are partially overlapped in the direction perpendicular to the gas flow direction. In comparison with this, a portion in which the electrodes in the gas flow path are densely arranged is eliminated, thereby preventing an increase in gas pressure loss. Further, since the number of electrodes can be reduced, the configuration of the electric precipitator can be simplified, the production cost can be reduced, and the production can be facilitated. Further, the dust collecting portion electrode is arranged to be shifted from the charging portion electrode in the direction perpendicular to the gas flow direction, and can form a corona discharge region crossing the gas flow direction. As a result, even if corona discharge is generated using the dust collecting electrode disposed downstream of the charging section electrode, the gas passes across the corona discharge area, so that the particulate matter contained in the gas can be reliably removed. Can be charged. The charged particulate matter is collected on the dust collecting part electrode by Coulomb force. Therefore, even when the corona discharge is generated by the charging unit electrode and the dust collecting unit electrode arranged as described above, the particulate matter can be appropriately collected from the gas. In addition, the dust collecting section electrode is a flat plate-shaped electrode, can obtain a large dust collecting area, can increase the dust collecting efficiency, and is arranged along the gas flow direction, so that the dust collecting area is reduced. Even if the pressure is increased, the pressure loss of the gas is prevented from being greatly reduced. In addition, since the particulate matter is collected only at the dust collecting portion electrode disposed downstream of the corona discharge region in the gas flow direction, even if an AC power supply is used as the corona discharge power source, the particulate matter is once charged and collected. The particulate matter collected on the electrodes is not discharged by AC corona discharge, and can be collected with high dust collection efficiency. Of course, a DC power supply can be used as the power supply for corona discharge. As a result, the degree of freedom in selecting a power supply that can be used as the power supply for corona discharge is increased, and the degree of freedom in designing the electric precipitator is increased.

In each projection, a first projection and a second projection are alternately formed, and the first projection and the second projection are discharged toward different dust collecting portion electrodes, and are generated from each projection. Corona discharges are prevented from interfering with each other. Thereby, a suitable corona discharge can be efficiently generated.

According to a fourth aspect of the present invention, there is provided a flow path in which a gas containing particulate matter to be collected flows, which is arranged at intervals in a direction perpendicular to a flow direction of the flow path. A charging unit power supply having a plurality of substantially triangular projections formed at a downstream end in the flow direction of the flow channel, the charging unit power source being downstream of the flow channel from the charging unit electrode; A first dust collector electrode in the form of a flat plate, which is arranged at intervals in the direction perpendicular to the flow direction of the flow path, and which is displaced from the charging unit electrode in the vertical direction, and extends along the flow direction, A power supply for corona discharge that generates corona discharge between a tip of each projection of the charging unit electrode and an end of the first dust collection unit electrode on the upstream side in the flow direction; Wherein the first dust collecting portion electrodes are disposed between the vertical directions and extend along the flow direction. A second dust collecting portion electrode, and a power supply for forming a DC electric field between the first and second dust collecting portion electrodes, wherein each of the protrusions is inclined in one thickness direction of the charging portion electrode. A first projection protruding toward one side of the two first dust collecting section electrodes adjacent to the charging section electrode; and a second projection inclined to the other side in the thickness direction of the charging section electrode and adjacent to the charging section electrode.
Of the two first dust collector electrodes projecting toward the other
And the first and second projections are formed alternately to prevent the corona discharges generated from the mutually adjacent first and second projections from interfering with each other. It is an electric dust collector.

According to the present invention, the charging section electrodes arranged at intervals in the direction perpendicular to the flow direction of the flow path through which the gas flows, and the flow path of the flow path downstream of the charging section electrode from the charging section electrode A first dust collecting portion electrode arranged at intervals in a direction perpendicular to the direction, and between a tip of each projection of the charging portion electrode and an end of the first dust collecting portion electrode on the upstream side in the flow direction. Thus, a corona discharge is generated. This makes it possible to use the first dust collecting portion electrode as an electrode for generating corona discharge, without requiring a counter electrode for discharge provided in a conventional device, and reducing the number of electrodes. Can be reduced. Therefore, the pressure loss of the gas can be reduced. Further, by disposing the first dust collecting portion electrode downstream of the charging portion electrode in the gas flow direction, the charging portion electrode and the first dust collecting portion electrode are partially overlapped in the direction perpendicular to the gas flow direction. As compared with the case where the electrodes are arranged in a vertical direction, the portion in which the electrodes in the gas flow path are densely arranged is eliminated, thereby preventing an increase in gas pressure loss. Further, since the number of electrodes can be reduced, the configuration of the electric precipitator can be simplified, the production cost can be reduced, and the production can be facilitated.

Further, the dust collecting portion electrode is arranged with respect to the charging portion electrode.
The corona discharge region is arranged so as to be displaced in the direction perpendicular to the gas flow direction and crosses the gas flow direction. Even if a corona discharge is generated by using the dust collecting electrode arranged downstream of the charging unit electrode by this,
Since the gas passes across the corona discharge region, the particulate matter contained in the gas can be reliably charged. Further, a second dust collecting portion electrode is arranged between the first dust collecting portion electrodes, and a DC electric field is formed between the first and second dust collecting portion electrodes by an electric field forming power supply. The charged particulate matter is collected on one of the first and second dust collecting electrodes by the Coulomb force of the dust collecting electrode. At this time, different electric potentials are applied to the first and second dust collecting portion electrodes, and a large coulomb is applied to the particulate matter as compared with the case where the first and second dust collecting portion electrodes have the same potential. Force acts. Therefore, the particulate matter can be reliably collected.

As described above, even when the corona discharge is generated by the charging unit electrode and the dust collecting unit electrode arranged as described above, the particulate matter can be appropriately collected from the gas. In addition, the dust collecting portion electrode is a plate-shaped electrode, and can obtain a large dust collecting area, and is arranged along the gas flow direction. Therefore, even if the dust collecting area is increased, the gas pressure loss is reduced. A large drop is prevented.

Further, since the particulate matter is collected only on the dust collecting portion electrode disposed downstream of the corona discharge region in the gas flow direction, even if an AC power supply is used as a corona discharge power supply, the particulate matter is once charged. The particulate matter collected in the dust collecting portion electrode is not discharged by AC corona discharge, and can be collected with high dust collection efficiency. Of course, a DC power supply can be used as the power supply for corona discharge, and the degree of freedom in selecting a power supply that can be used as the power supply for corona discharge increases, and the degree of freedom in designing the electric dust collector increases. In each projection, a first projection and a second projection are formed alternately, and the first projection and the second projection are
Discharge is performed toward different dust collecting portion electrodes, and corona discharge generated from each projection is prevented from interfering with each other. Thereby, a suitable corona discharge can be efficiently generated.

According to a fifth aspect of the present invention, there is provided a fuel cell system in which a gas containing particulate matter to be collected is disposed at intervals in a direction perpendicular to a flow direction of the flow path. A charging section electrode having a plurality of substantially triangular protrusions formed at a downstream end of the flow path in the flow direction of the flow path; At a distance in the direction perpendicular to the flow direction of the flow path, and a plate-shaped first dust collection unit electrode that is arranged to be shifted from the charging unit electrode in the vertical direction and extends along the flow direction, Downstream of the flow path from the charging unit electrode, between the vertical direction of the first dust collection unit electrode, the charging unit electrode is disposed to be shifted in the vertical direction and extends in the flow direction in a flat plate shape A second dust collecting portion electrode, a tip of each projection of the charging portion electrode, and first and second
A corona discharge power supply for generating a corona discharge between the dust collector electrode and the end on the upstream side in the flow direction;
An electric field forming power supply for forming a DC electric field between the dust collecting portion electrodes, wherein each of the protrusions is inclined in one thickness direction of the charging portion electrode and faces the first dust collecting portion electrode adjacent to the charging portion electrode. And a second protrusion that is inclined to the other side in the thickness direction of the charging unit electrode and protrudes toward a second dust collecting unit electrode adjacent to the charging unit electrode. The projection is formed alternately to prevent the corona discharge generated from the first projection and the second projection adjacent to each other from interfering with each other.

According to the present invention, the charging section electrodes arranged at intervals in the direction perpendicular to the flow direction of the flow path through which the gas flows, A first dust collector electrode disposed at intervals in the direction perpendicular to the first direction, a second dust collector electrode disposed between the first dust collector electrodes downstream of the flow path from the charging unit electrode, And a corona discharge is generated between the tip of each protrusion of the charging unit electrode and the upstream end of the first and second dust collection unit electrodes in the flow direction. Thereby, it is possible to use the first and second dust collecting portion electrodes as electrodes for generating corona discharge, without requiring a counter electrode for discharge provided in a conventional device, The number of electrodes can be reduced. Therefore, the pressure loss of the gas can be reduced, and the operation efficiency can be improved. Further, by arranging the first and second dust collecting portion electrodes downstream of the charging portion electrode in the gas flow direction, the charging portion electrode and the first and second dust collecting portion electrodes are perpendicular to the gas flow direction. Compared with the case where the electrodes are partially overlapped in the direction, the portion in which the electrodes in the gas flow path are densely arranged is eliminated, thereby preventing the gas pressure loss from increasing. Further, since the number of electrodes can be reduced, the configuration of the electric precipitator can be simplified, the production cost can be reduced, and the production can be facilitated. Further, the dust collecting portion electrode is arranged to be shifted from the charging portion electrode in the direction perpendicular to the gas flow direction, and can form a corona discharge region crossing the gas flow direction. As a result, even if corona discharge is generated using the dust collecting electrode disposed downstream of the charging section electrode, the gas passes across the corona discharge area, so that the particulate matter contained in the gas can be reliably removed. Can be charged. A DC electric field is formed between the first and second dust collecting portion electrodes by an electric field forming power supply. The charged particulate matter is collected on one of the first and second dust collecting electrodes by the Coulomb force of the dust collecting electrode. At this time, different electric potentials are applied to the first and second dust collecting portion electrodes, and a large coulomb is applied to the particulate matter as compared with the case where the first and second dust collecting portion electrodes have the same potential. Force acts. Therefore, the particulate matter can be reliably collected.

As described above, even when the corona discharge is generated by the charging unit electrode and the dust collecting unit electrode arranged as described above, the particulate matter can be appropriately collected from the gas. In addition, the dust collecting portion electrode is a plate-shaped electrode, and can obtain a large dust collecting area, and is arranged along the gas flow direction. Therefore, even if the dust collecting area is increased, the gas pressure loss is reduced. A large drop is prevented. In addition, since the particulate matter is collected only at the dust collecting portion electrode disposed downstream of the corona discharge region in the gas flow direction, even if an AC power supply is used as the corona discharge power source, the particulate matter is once charged and collected. The particulate matter collected on the electrodes is not discharged by AC corona discharge, and can be collected with high dust collection efficiency. Of course, a DC power supply can be used as the power supply for corona discharge, and the degree of freedom in selecting a power supply that can be used as the power supply for corona discharge increases, and the degree of freedom in designing the electric dust collector increases.
In each projection, a first projection and a second projection are alternately formed, and the first projection and the second projection are discharged toward different dust collecting portion electrodes, and corona discharge generated from each projection is generated. Interference with each other is prevented. Thereby, a suitable corona discharge can be efficiently generated.

[0025]

FIG. 1 is a sectional view schematically showing an electric precipitator 20 according to an embodiment of the present invention. The electrostatic precipitator 1 is a device for collecting fine solid and liquid particulate matter to be collected, such as dust, carbon particles and water droplets, contained in a gas such as air and purifying the gas. Yes, it is used to purify air in tunnels, purify indoor air in ordinary houses, and purify various industrial exhaust gases. The electrostatic precipitator 20 is a so-called two-stage electric precipitator having a charging unit 32 and a dust collecting unit 33, and includes a housing 21, a charging unit electrode 22, a dust collecting unit electrode 23, and a power supply for corona discharge. 24.

The housing 21 has an inflow opening 27 at one end.
Are formed at the other end, and a substantially horizontal flow path 29 communicating with the openings 27, 28 is formed. The gas containing the particulate matter to be collected is supplied to the electric precipitator 20 as indicated by an arrow B1 by gas supply means (not shown) realized by, for example, a blower or the like. Flows into
As shown by an arrow B, the flow path 29 in the housing 21 flows from the inflow opening 27 to the outflow opening 28,
As shown by 2, the fluid flows out of the housing 21 through the fluid outlet 28. The electric precipitator 20 includes a housing 21
Charging section 32 and dust collecting section 33 in order from the upstream side in the gas flow direction B along the gas flow path 29 formed by
Is provided.

The charging section electrode 22 is connected to a flow path 29 through which gas flows.
A plurality of charging units 32, two in this embodiment, are provided. Each of the charging section electrodes 22 is a flat plate-shaped electrode arranged at intervals in a direction perpendicular to the flow direction B of the gas in the flow path 29, in this embodiment, in the vertical direction. It is arranged horizontally along B. The dust collecting portion electrode 23
A plurality of, in this embodiment, three, dust collecting sections 33 are provided on the dust collecting section 33 downstream of the flow path 29 from the charging section electrodes 22. Each of the dust collecting portion electrodes 23 is a flat plate-shaped electrode arranged at regular intervals in a direction perpendicular to the flow direction B of the flow path 29, in this embodiment, in the vertical direction. It is arranged horizontally along B. Further, each dust collecting portion electrode 23 is shifted from each charging portion electrode 22 in a vertical direction perpendicular to the flow direction B,
More specifically, a virtual plane 36 including a center position between the virtual planes 35 positioned at the center in the thickness direction of each dust collecting section electrode 23 is positioned at the center of each charging section electrode 22 in the thickness direction. Each distance D between the plane 35 and each virtual plane 36
Are arranged to be equal to each other. Each interval D is selected to be, for example, 15 to 30 mm.

The corona discharge power supply 24 is connected to each charging section electrode 2.
An AC power source is used as a power source for generating a corona discharge between the dust collection unit 2 and an end of each dust collecting portion electrode 23 on the upstream side in the flow direction B. The corona discharge power supply 24 can be used only by transforming a commercial power supply, and does not require complicated equipment such as a rectifier. By this corona discharge power supply 24, each charging section electrode 22 is given a potential having an amplitude voltage of, for example, 21 kV (effective value 15 kV) with respect to the ground potential. Also, each dust collecting portion electrode 23
Are grounded, and an AC corona discharge is applied between each of the charging unit electrodes 22 and each of the dust collecting unit electrodes 23 by a voltage between the potential applied to each of the charging unit electrodes 22 by the corona discharge power supply 24 and the ground potential. Is generated.

FIG. 2 shows the flow direction B of the charging section electrode 22 in FIG.
FIG. 3 is an enlarged cross-sectional view showing the vicinity of an end portion 39 on the downstream side and an end portion 39 on the upstream side in the flow direction B of the dust collecting portion electrode 33;
FIG. 3 is a bottom view showing the ends 38 and 39 as viewed from below in FIG. 2. Each of the charging section electrodes 22 has an end 3 on the downstream side in the flow direction B.
8, a plurality of substantially triangular projections 40 are formed at regular intervals in a direction perpendicular to the gas flow direction B. Each projection 40
Has a first projection 40a inclined to one side in the thickness direction of the charging unit electrode 22, and a second projection 40b inclined to the other side in the thickness direction of the charging unit electrode 22, and the first and second projections 40a.
a and 40b are formed alternately. First protrusion 40a
Protrudes toward one of the two dust collecting portion electrodes 23 adjacent to the charging portion electrode 22, and the second electrode 40b faces toward the other of the two dust collecting portion electrodes 23 adjacent to the charging portion electrode 22. It is protruding.

As described above, each projection 40 is provided on each charging section electrode 22.
Is formed, when the voltage is applied by the corona discharge power supply 24, the lines of electric force are concentrated on the tips of the respective projections 40 in the electric field formed between the charging unit electrode 22 and the dust collecting unit electrode 23. Each of the projections 40
The corona discharge can be generated from the front end 49 of the dust collecting portion electrode 23 toward the end 39 on the upstream side in the flow direction of each dust collecting portion electrode 23.
By flowing the gas through the discharge region S between each projection 40 where such corona discharge is generated and the end 39 of the dust collecting portion electrode 23, the particulate matter contained in the gas is corrected. Or negatively charged. The charged particulate matter is collected in a dust collecting section 33 in which each dust collecting section electrode 23 is arranged.
Are collected by each dust collecting portion electrode 23 by the Coulomb force. Thereby, the particulate matter contained in the gas to be collected is collected.

In the electric precipitator 20 of the present invention which collects dust in this manner, the precipitator electrode 23 is used as an electrode for generating a corona discharge. No counter electrode is required, and the number of electrodes can be reduced. Therefore, the pressure loss of gas can be reduced, and the operating efficiency of the means for supplying gas, such as a blower, can be improved. Further, the dust collecting portion electrode 23
Is disposed downstream of the charging unit electrode 22 in the gas flow direction B, so that the charging unit electrode 22 and the dust collection unit electrode 23 are partially overlapped with each other in a direction perpendicular to the gas flow direction B. Compared to the case, the electrodes 22, 2 in the gas flow path 29
This eliminates the portion where the elements 3 are densely arranged, thereby preventing an increase in gas pressure loss. Further, since the number of electrodes can be reduced, the electric precipitator 20
Can be simplified, the manufacturing cost can be reduced, and the device can be easily manufactured.

The dust collecting portion electrode 23 is arranged to be shifted from the charging portion electrode 22 in a direction perpendicular to the gas flow direction, and may form a corona discharge region intersecting with the gas flow direction B. it can. As a result, even if corona discharge is generated using the dust collecting electrode 23 disposed downstream of the charging section electrode 22, the gas passes across the corona discharge region S, so that the fine particles contained in the gas The substance can be charged. In addition, the charging unit electrode 22 has a flat plate shape, and even if a large tension is applied to prevent vibration and the like due to electric discharge, the electrode does not break, so that it is possible to reliably prevent vibration and maintain a suitable discharge. it can. Further, each projection 40 is formed, and the adjacent first projection 40a and second projection 40 are formed.
From b, discharge is performed toward a different dust collecting portion electrode 23. Therefore, the corona discharges generated from the projections 40 are prevented from interfering with each other, and a suitable corona discharge can be efficiently generated.

The charging section electrode 23 is disposed in the gas flow direction B.
, The gas pressure loss can be prevented from being greatly reduced even in the case of a flat plate. Furthermore, each projection 4
The height h of 0 is selected from 0.5 to 2.0 mm,
By selecting 0.5 mm or more, the effect of alternately inclining in different directions as described above is reliably achieved, and by selecting 2.0 mm or less,
Each projection 40 is prevented from protruding too much in the direction perpendicular to the gas flow direction B and causing a large pressure loss. The distance D between the virtual planes 35 and 36 where the electrodes 22 and 23 are arranged is selected to be 15 mm or more and 30 mm or less.
By selecting a diameter of at least 30 mm, it is possible to prevent the density of the electrode from becoming high and causing a large pressure loss. It is possible to prevent the water from passing through the past position, and to surely collect by the Coulomb force.

The dust collecting portion electrode 23 is a flat plate-shaped electrode, can obtain a large dust collecting area, can increase the dust collecting efficiency, and is arranged along the gas flow direction B. Even if the dust collecting area is increased, it is possible to prevent the pressure loss of the gas from being greatly reduced. The particulate matter is
Since the dust is collected only at the dust collecting portion electrode 23 disposed downstream of the corona discharge region in the gas flow direction, even if an AC power source is used as the corona discharge power source 24, the dust is collected once and collected at the dust collecting portion electrode 23. The collected particulate matter is not discharged by AC corona discharge, and can be collected with high dust collection efficiency.

FIG. 4 shows an end portion 51 on the downstream side in the flow direction B of the charging section electrode 50 which can be provided in place of the charging section electrode 22 in each of the electrostatic precipitators 70 and 80 shown in FIGS. It is sectional drawing which expands and shows the vicinity of the end part 39 of the flow direction B upstream of the dust collection part electrode 23, and FIG. 5 is the bottom view which shows each end part 51 and 39 when it sees from the lower part of FIG. FIG.
3 are denoted by the same reference numerals, and description thereof is omitted. Charger electrode 50
Is similar to the charging section electrode 22 of the above-described embodiment, and has a plurality of substantially triangular protrusions 5 at the end 51 on the downstream side in the flow direction B.
2 are formed at equal intervals in a direction perpendicular to the gas flow direction B. Each projection 52 projects straight toward the downstream side in the gas flow direction B. When such a charging electrode 22 is used, corona discharge is generated from the tip 53 of each projection 52 to two adjacent dust collecting portion electrodes 23.

Even when such a charging section electrode 52 is used, the gas flows through the discharge area S1 between each projection 52 where corona discharge is generated and the end 39 of the dust collecting section electrode 23. By doing so, the particulate matter contained in the gas is positively or negatively charged. When the charged particulate matter flows through the dust collecting portion 33 where the respective dust collecting portion electrodes 23 are arranged, the dust particles of the respective dust collecting portion electrodes 23 are caused by Coulomb force.
Collected in. Thereby, the particulate matter contained in the gas to be collected is collected. Thus, similarly to the above-described embodiment, the particulate matter can be collected. In this embodiment, instead of the effect of inclining each projection 52 of the above-described embodiment, an effect of further preventing a decrease in pressure loss is achieved. Other effects are achieved in the same manner as in the above-described embodiment. Therefore, when it is important to reduce the pressure loss, such a charging unit electrode 50 can be suitably used.

FIG. 6 shows a flow direction B upstream of the charging unit electrode 55 and the dust collecting unit electrode 23 which can be provided in place of the charging unit electrode 22 in each of the electric precipitators 70 and 80 shown in FIGS. It is sectional drawing which expands and shows the edge part 39 vicinity of the side. Portions having the same configuration as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted. The charging unit electrode 55 is perpendicular to the flow direction B, and
3 is a linear body extending in parallel with 3. When such a charging electrode 55 is used, the corona is charged toward two adjacent dust collecting electrodes 23 over a region facing two adjacent dust collecting electrodes 23 in the longitudinal direction of the charging electrode 55. Discharge is generated.

Even when such a charging section electrode 52 is used, the gas flows through the discharge area S2 between the charging section electrode 55 where the corona discharge is generated and the end 39 of the dust collecting section electrode 23. As a result, the particulate matter contained in the gas is positively or negatively charged. The charged particulate matter is collected in a dust collecting section 33 in which each dust collecting section electrode 23 is arranged.
Are collected by each dust collecting portion electrode 23 by the Coulomb force. Thereby, the particulate matter contained in the gas to be collected is collected. Thus, similarly to the above-described embodiment, the particulate matter can be collected. The effect of generating corona discharge between the charging unit electrode 55 and the dust collecting unit electrode 23 is achieved in the same manner as in the above-described embodiment.

FIG. 7 shows an end 61 on the downstream side in the flow direction B of the charging section electrode 60 which can be provided in place of the charging section electrode 22 in each of the electrostatic precipitators 70 and 80 shown in FIGS. It is sectional drawing which expands and shows the vicinity of the end part 39 of the flow direction B upstream of the dust collection part electrode 23. Portions having the same configuration as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted. The end 61 of the charging unit electrode 55 on the downstream side in the flow direction B is formed in a tapered shape. When such a charging electrode 60 is used, the charging electrode 6
0, a linear tip 62 extending in a direction perpendicular to the flow direction B
Corona discharge is generated toward the two adjacent dust collecting electrodes 23 over the region facing the two adjacent dust collecting electrodes 23.

Even when such a charging section electrode 60 is used, the gas flows through the discharge region S3 between the charging section electrode 60 where corona discharge is generated and the end 39 of the dust collecting section electrode 23. As a result, the particulate matter contained in the gas is charged either positively or negatively. The charged particulate matter is collected in a dust collecting section 33 in which each dust collecting section electrode 23 is arranged.
Are collected by each dust collecting portion electrode 23 by the Coulomb force. Thereby, the particulate matter contained in the gas to be collected is collected. Thus, similarly to the above-described embodiment, the particulate matter can be collected. The effect of generating corona discharge between the charging unit electrode 60 and the dust collecting unit electrode 23 is achieved in the same manner as in the above-described embodiment.

FIG. 8 shows an end portion 66 on the downstream side in the flow direction B of the charging portion electrode 65 which can be provided in place of the charging portion electrode 22 in each of the electrode dust collecting devices 70 and 80 shown in FIGS. FIG. 5 is an enlarged cross-sectional view showing the vicinity of an end portion 39 on the upstream side in the flow direction B of the dust collecting portion electrode 23. Portions having the same configuration as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof will be omitted. The charging portion electrode 65 is formed at the end 66 on the downstream side in the flow direction B with protrusions 67 protruding on both sides in the thickness direction and extending in a direction perpendicular to the flow direction B. When such a charging electrode 65 is used, it faces two dust collecting portion electrodes 23 adjacent to a linear tip 68 extending in a direction perpendicular to the flow direction B of each ridge 67 of the charging electrode 65. Corona discharge is generated over the region toward two adjacent dust collecting portion electrodes 23.

Even when such a charging section electrode 65 is used, the gas flows through the discharge region S4 between the charging section electrode 65 where the corona discharge is generated and the end 39 of the dust collecting section electrode 23. As a result, the particulate matter contained in the gas is charged either positively or negatively. The charged particulate matter is collected in a dust collecting section 33 in which each dust collecting section electrode 23 is arranged.
Is collected by the dust collecting portion electrodes 23 by the Coulomb force. Thereby, the particulate matter contained in the gas to be collected is collected. Thus, similarly to the above-described embodiment, the particulate matter can be collected.
The effect of generating corona discharge between the charging unit electrode 65 and the dust collecting unit electrode 23 is achieved in the same manner as in the above-described embodiment.

FIG. 9 is a simplified sectional view showing an electric precipitator 70 according to another embodiment of the present invention. The electrostatic precipitator 70 has a configuration similar to that of the electric precipitator 20 of the embodiment shown in FIGS. Omitted. In the present embodiment, the dust collecting section 33 includes, as dust collecting section electrodes, first dust collecting section electrodes 23 having the same configuration as the dust collecting section electrodes 23 in the forms shown in FIGS. A second dust collecting portion electrode 71 disposed between the external electrodes 23 is provided. Each second dust collector electrode 7
Numeral 1 is a flat plate arranged such that an imaginary plane on which the charging unit electrodes 22 are arranged is located at the center in the thickness direction.
It is provided in parallel with each first dust collecting portion electrode 23.

The electric precipitator 70 comprises first and second
An electric field forming power supply 72 for forming a DC electric field between the dust collecting portion electrodes 23 and 71 is included. The electric field forming power supply 72 has an output voltage having an absolute value smaller than the amplitude voltage of the corona discharge power supply 24, that is, a voltage of 8 kV in this embodiment. Each second dust collecting portion electrode 71 is supplied with a potential lower than the ground potential by, for example, 8 kV by the electric field forming power supply 72, and the first and second
A DC electric field is formed between the dust collecting portion electrodes 23 and 71.

In the electric precipitator 70 of this embodiment, similarly to the above-mentioned electric precipitator 20, the discharge area between each projection 40 where corona discharge is generated and the end 39 of the precipitator electrode 23 is provided. As the gas flows through S, the particulate matter contained in the gas is charged to either positive or negative.
The charged particulate matter is collected by the dust collecting electrodes 23 by a large Coulomb force when flowing through the dust collecting section 33 where the respective dust collecting section electrodes 23 are arranged. Thereby, the particulate matter contained in the gas to be collected is collected.

An electric precipitator 70 for collecting dust in this way.
Can achieve the same effect based on the same configuration as the electric precipitator 20. In the device 70 of this embodiment,
Since a large Coulomb force can be given by forming charged particulate matter, even if the gas flow rate is increased,
The charged particulate matter is prevented from passing through the dust collecting portion 33 without being collected by the dust collecting portion electrodes 23 and 71, and is compared with a case where no electric field is formed in the dust collecting portion 33. Thus, the dust collection efficiency is improved.

The second dust collecting portion electrode 71 is connected to the charging portion electrode 2.
In order to prevent a corona discharge from occurring between the second dust collecting portion electrode 71 and the second dust collecting portion electrode 71, the end portion 7 on the upstream side in the flow direction B is used.
4 are disposed on the downstream side in the gas flow direction B by a distance L from the end portion 39 of each first dust collecting portion electrode 23, and the charging portion electrode 22 and the first dust collecting portion electrode 23 It is configured so that corona discharge occurs between them. As shown by a solid line in FIG. 9, the end 73 of the second dust collecting portion electrode 71 on the downstream side in the gas flow direction B is smaller than the end 75 of the first dust collecting portion electrode 23 on the downstream side in the flow direction. It may be disposed so as to be located on the upstream side in the gas flow direction B, or may be disposed so as to extend to a position similar to that of the first dust collecting portion electrode 23 as indicated by a virtual line 76. First and second dust collecting portion electrodes 23, 71
The dust collecting part 33 can be
The electric field can be formed over a wide area, and the dust collection efficiency can be improved.

FIG. 10 is a graph showing the output voltage of the power supply 24 for corona discharge and the output voltage of the power supply 72 for electric field formation. The horizontal axis indicates time, and the vertical axis indicates output voltage. The corona discharge power supply 24 is an alternating current having an absolute value of the maximum output voltage of 21 kV as indicated by a solid line 78, and the electric field forming power supply 72 has an output voltage of −8 k
V DC power supply. Thus, the electric field forming power source 7
2 has an output voltage having an absolute value smaller than the amplitude voltage of the corona discharge power supply 24, so that the voltage between the charging unit electrode 22 and the second dust collecting unit electrode 71 can be prevented from becoming too large. In addition, the second dust collecting portion electrode 71 is arranged as close to the charging portion electrode 22 as possible, so that the area facing the first dust collecting portion electrode 23 can be widened, and the electric field forming region can be widened. Therefore, dust collection efficiency can be improved.

FIG. 11 is a simplified sectional view showing an electric precipitator 80 according to still another embodiment of the present invention. The electrostatic precipitator 70 has a configuration similar to that of the electric precipitator 20 of the embodiment shown in FIGS. Omitted. In the present embodiment, the dust collecting section 33 includes two first dust collecting section electrodes 81, each of which is a plate-like electrode similar to the dust collecting section electrode 23 of the embodiment shown in FIGS. 1 dust collector electrode 8
One second dust collecting portion electrode 82 is provided. That is, it has a total of three dust collecting portion electrodes, and is arranged at the same position as the dust collecting portion electrode 23 shown in FIGS.

The electric precipitator 80 includes first and second electric dust collectors.
Electric field forming power supplies 83 and 84 for forming a DC electric field between the dust collecting section electrodes 81 and 82 are included. Electric field forming power supplies 83, 84
Has an output voltage having an absolute value less than the amplitude voltage of the corona discharge power supply 24, which is 8 kV in this embodiment. Each first dust collecting portion electrode 81 is supplied with a potential higher than the ground potential by, for example, 8 kV by the electric field forming power supply 83, and each second dust collecting portion electrode 82 is supplied with the electric field forming power supply 84 from the ground potential. For example, a potential lower by 8 kV is applied,
A DC electric field is formed between the second dust collecting portion electrodes 81 and 82.

FIG. 12 (1) is a graph showing the output voltage of the electric field forming power supply 84, FIG. 12 (2) is a graph showing the output voltage of the electric field forming power supply 83, and FIG. 4 is a graph showing an output voltage of a power supply for discharge 24.
12 (1) to 12 (3), the horizontal axis represents time, and the vertical axis represents output voltage. The electric field forming power supply 84 is a DC power supply having an output voltage of 8 kV, the electric field forming power supply 83 is a DC power supply having an output voltage of −8 kV, and the corona discharge power supply 24 is an absolute value of the maximum output voltage. Is 21k
V is the exchange. Thus, each electric field forming power source 8
Reference numerals 3 and 84 have an output voltage having an absolute value less than the amplitude voltage of the corona discharge power supply 24.

In such a configuration, from time t1 to time t
2, time t3 to time t4, and time t5 to time t
6, a positive corona discharge is generated in a region S11 between each protrusion 40 of the charging unit electrode 22 and an end 86 on the upstream side in the flow direction B of the second dust collecting unit electrode 82, and the time from time t2 to time t2 At time t3, time t4 to time t5, and time t6 to time t7, the protrusion 40 of the charging unit electrode 22 and the first
A negative corona discharge is generated in a region S11 between the dust collecting portion electrode 81 and the end portion 85 on the upstream side in the flow direction B. Thus, positive corona discharge and negative corona discharge are generated alternately in different regions.

When the gas flows through the discharge region S11 between the projection 40 of the charging portion electrode 22 and the end portion 86 of the second dust collecting portion electrode 82, the particulate matter contained in the gas becomes positive. Be charged. The particulate matter positively charged as described above is captured by the second dust collecting portion electrode 82 by Coulomb force when flowing through the dust collecting portion 33 where the respective dust collecting portion electrodes 81 and 82 are arranged. Gathered. Also, the protrusion 4 of the charging portion electrode 22
0 and the discharge region S between the end portion 85 of the first dust collecting portion electrode 81
The fine particles contained in the gas are negatively charged by flowing the gas through the gas. The particulate matter negatively charged as described above is captured by the first dust collecting portion electrode 81 by Coulomb force when flowing through the dust collecting portion 33 where the respective dust collecting portion electrodes 81 and 82 are arranged. Gathered. As described above, the particulate matter to be collected contained in the gas is positively or negatively charged, and the first or second dust collection portion electrode 8 is charged.
1, 82 collects dust.

The electric dust collecting device 80 for collecting dust in this way.
Can achieve the same effect based on the same configuration as the electric precipitator 20. In the device 80 of this embodiment,
Since a large Coulomb force from an electric field can be applied to the charged particulate matter, even if the gas flow rate is increased, the charged particulate matter is retained in each of the dust collecting portion electrodes 81 and 82.
Is prevented from passing through the dust collecting portion 33 without being collected in the dust collecting portion 33, compared with a case where an electric field is not formed in the dust collecting portion 33.
Dust collection efficiency is improved. Further, the positively charged particulate matter flows into the region S20 and the negatively charged particulate matter flows through the region S21, so that they are not in contact with each other to be neutralized.

The first and second dust collecting portion electrodes 81 and 82
Are applied with voltages of opposite polarities, and a positive or negative corona discharge is alternately generated between the first and second dust collecting portion electrodes 81 and 82 by alternately generating a positive or negative corona discharge with the charging portion electrode 22. May be arranged at an equal distance from the charging unit electrode 22, and it is not necessary to retreat either of them to the downstream side in the gas flow direction B downstream. Accordingly, the first and second dust collecting portion electrodes 81 and 82 have substantially the same shape and size, and all the regions of the respective dust collecting portion electrodes 81 and 82 are opposed to each other to form an electric field over the entire region. It is possible,
The electric field region can be made as wide as possible. Also, as in the embodiment shown in FIGS. 9 and 10, in order to form an electric field in the dust collecting portion 33, there is no need to separately provide a dust collecting portion electrode on the same virtual plane as the charging portion electrode 22, and the dust collecting portion It is prevented that the arrangement density of the electrodes is increased in the dust collecting portion 33.
Pressure loss at

Each of the above embodiments is merely an example of the present invention,
The configuration can be changed within the scope of the present invention. For example, the numbers of the charging unit electrodes and the dust collecting unit electrodes are not limited, and can be appropriately changed based on the amount of gas to be processed. Also, the charging section electrodes shown in FIGS. 4 to 8 may be provided instead of the charging section electrodes 22 of the electric precipitators 70 and 80 in the forms shown in FIGS. be able to. Further, the corona discharge power supply 24 may be a DC power supply, and each electric field forming power supply may be configured to give a potential of opposite polarity. Further, the electrodes 22 and 23 may be arranged vertically.

[0057]

According to the first aspect of the present invention, the charging section electrodes arranged at intervals in the direction perpendicular to the flow direction of the flow path through which the gas flows, and the downstream of the flow path with respect to the charging section electrodes. A first dust collecting portion electrode arranged at intervals in a direction perpendicular to the flow direction of the flow path, and a charging portion electrode and an end of the first dust collecting portion electrode on the upstream side in the flow direction; In between, a corona discharge is generated. This makes it possible to use the first dust collecting portion electrode as an electrode for generating corona discharge, without requiring a counter electrode for discharge provided in a conventional device, and reducing the number of electrodes. Can be reduced. Therefore, the pressure loss of the gas can be reduced. Further, by disposing the first dust collecting portion electrode downstream of the charging portion electrode in the gas flow direction, the charging portion electrode and the first dust collecting portion electrode are partially overlapped in the direction perpendicular to the gas flow direction. As compared with the case where the electrodes are arranged in a vertical direction, the portion in which the electrodes in the gas flow path are densely arranged is eliminated, thereby preventing an increase in gas pressure loss. Further, since the number of electrodes can be reduced, the configuration of the electric precipitator can be simplified, the production cost can be reduced, and the production can be facilitated. In addition, the dust collecting section electrode
The corona discharge region is arranged so as to be displaced in the direction perpendicular to the gas flow direction with respect to the charging unit electrode, and crosses the gas flow direction. As a result, even if corona discharge is generated using the dust collecting electrode disposed downstream of the charging section electrode, the gas passes across the corona discharge area, so that the particulate matter contained in the gas can be reliably removed. Can be charged. Further, a second dust collecting portion electrode is arranged between the first dust collecting portion electrodes, and a DC electric field is formed between the first and second dust collecting portion electrodes by an electric field forming power supply. The charged particulate matter is collected on one of the first and second dust collecting electrodes by the Coulomb force of the dust collecting electrode. At this time, the first and second dust collecting section electrodes are given different potentials from each other,
And the case where the second dust collector electrode is at the same potential,
A large Coulomb force acts on the particulate matter. Therefore, the particulate matter can be reliably collected.

As described above, even when the corona discharge is generated by the charging unit electrode and the dust collecting unit electrode arranged as described above, the particulate matter can be appropriately collected from the gas. In addition, the dust collecting portion electrode is a plate-shaped electrode, and can obtain a large dust collecting area, and is arranged along the gas flow direction. Therefore, even if the dust collecting area is increased, the gas pressure loss is reduced. A large drop is prevented. In addition, since the particulate matter is collected only at the dust collecting portion electrode disposed downstream of the corona discharge region in the gas flow direction, even if an AC power supply is used as the corona discharge power source, the particulate matter is once charged and collected. The particulate matter collected on the electrodes is not discharged by AC corona discharge, and can be collected with high dust collection efficiency. Of course, a DC power supply can be used as the power supply for corona discharge, and the degree of freedom in selecting a power supply that can be used as the power supply for corona discharge increases, and the degree of freedom in designing the electric dust collector increases.

The power supply for corona discharge is an AC power supply, a commercial power supply can be used, and power can be easily obtained. Further, the first dust collecting portion electrode is grounded, and the particulate matter contained in the gas is positively and negatively charged alternately, and the positively charged particulate matter is
The negatively charged particulate matter collected at the low-potential-side dust collecting electrode of the first and second dust-collecting electrodes is collected at the high-potential side of the first and second dust collecting electrodes. Collected on the electrodes. As a result, the particulate matter can be collected by both the first and second dust collecting portion electrodes, and the particulate matter charged positively or negatively by using a DC power supply as a corona discharge power supply can be collected by the first and second dust collection parts. As compared with the case where only one of the electrodes of the second dust collecting unit collects dust, the dust collecting area can be made larger and more particulate matter can be collected. Further, since the electric field forming power supply has an output voltage having an absolute value less than the amplitude voltage of the corona discharge power supply, it is possible to prevent the voltage between the charging unit electrode and the second dust collecting unit electrode from becoming too large. In this case, the second dust collecting portion electrode is arranged as close to the charging portion electrode as possible, so that the region facing the first dust collecting portion electrode can be widened, and the electric field forming region can be widened. Therefore, the dust collection efficiency can be improved without increasing the size of the device.

According to the second aspect of the present invention, the charging section electrodes arranged at intervals in the direction perpendicular to the flow direction of the flow path of the gas, and at the downstream of the flow path from the charging section electrodes,
A first dust collecting portion electrode arranged at intervals in a direction perpendicular to the flow direction of the flow passage, and a second dust collecting portion arranged between the first dust collecting portion electrode downstream of the flow passage from the charging portion electrode. A corona discharge is generated between the charging unit electrode and the upstream end of the first and second dust collecting unit electrodes in the flow direction. Thereby, it is possible to use the first and second dust collecting portion electrodes as electrodes for generating corona discharge, without requiring a counter electrode for discharge provided in a conventional device, The number of electrodes can be reduced. Therefore, the pressure loss of the gas can be reduced, and the operation efficiency can be improved. Further, by arranging the first and second dust collecting portion electrodes downstream of the charging portion electrode in the gas flow direction, the charging portion electrode and the first and second dust collecting portion electrodes are perpendicular to the gas flow direction. Compared with the case where the electrodes are partially overlapped in the direction, the portion in which the electrodes in the gas flow path are densely arranged is eliminated, thereby preventing the gas pressure loss from increasing. Further, since the number of electrodes can be reduced, the configuration of the electric precipitator can be simplified, the production cost can be reduced, and the production can be facilitated.

Further, the dust collecting portion electrode is
The corona discharge region is arranged so as to be displaced in the direction perpendicular to the gas flow direction and crosses the gas flow direction. Even if a corona discharge is generated by using the dust collecting electrode arranged downstream of the charging unit electrode by this,
Since the gas passes across the corona discharge region, the particulate matter contained in the gas can be reliably charged. A DC electric field is formed between the first and second dust collecting portion electrodes by an electric field forming power supply. The charged particulate matter is collected on one of the first and second dust collecting electrodes by the Coulomb force of the dust collecting electrode. At this time, different electric potentials are applied to the first and second dust collecting portion electrodes, and a large coulomb is applied to the particulate matter as compared with the case where the first and second dust collecting portion electrodes have the same potential. Force acts. Therefore, the particulate matter can be reliably collected.

As described above, even in the configuration in which the corona discharge is generated by the charging unit electrode and the dust collecting unit electrode arranged as described above, the particulate matter can be appropriately collected from the gas. In addition, the dust collecting portion electrode is a plate-shaped electrode, and can obtain a large dust collecting area, and is arranged along the gas flow direction. Therefore, even if the dust collecting area is increased, the gas pressure loss is reduced. A large drop is prevented.

Since the particulate matter is collected only at the dust collecting portion electrode located downstream of the corona discharge region in the gas flow direction, even if an AC power supply is used as the corona discharge power supply, the particulate matter is once charged. The particulate matter collected in the dust collecting part electrode is not discharged by AC corona discharge, and can be collected with high dust collection efficiency. Of course, a DC power supply can be used as the power supply for corona discharge, and the degree of freedom in selecting a power supply that can be used as the power supply for corona discharge increases, and the degree of freedom in designing the electric dust collector increases. Further, the power supply for corona discharge is an AC power supply, a commercial power supply can be used, and power can be easily obtained. Further, voltages of opposite polarities are respectively applied to the first and second dust collecting portion electrodes by the electric field forming power supply, and corona discharge between the charging portion electrode and the first dust collecting portion electrode, and the charging portion electrode and the first dust collecting portion electrode. A corona discharge having a polarity opposite to that of the corona discharge between the second dust collecting portion electrodes is generated. As a result, the particulate matter passing between the charging electrode and the first dust collecting part electrode and the particulate matter passing between the charging part electrode and the second dust collecting part electrode are charged with opposite polarities. . The positively charged particulate matter is collected on the lower potential side of the first and second dust collector electrodes, and the negatively charged particulate matter is collected on the first and second dust collector electrodes.
It is collected on the high-potential-side dust collecting portion electrode of the dust collecting portion electrodes.
As a result, the particulate matter can be collected by both the first and second dust collecting portion electrodes, and the particulate matter charged positively or negatively by using a DC power supply as a corona discharge power supply can be collected by the first and second dust collection parts. As compared with the case where only one of the electrodes of the second dust collecting unit collects dust, the dust collecting area can be made larger and more particulate matter can be collected. In addition, since corona discharges of opposite polarities are generated in mutually different regions, fine particles charged with mutually opposite polarities flow through regions deviated in a direction perpendicular to the gas flow direction. Become like Therefore, it is possible to prevent the particulate matter charged in opposite polarities from coming into contact with each other and being mutually neutralized. Further, since the power supply for forming an electric field has an output voltage having an absolute value smaller than the amplitude voltage of the power supply for corona discharge, the voltage between the first and second dust collecting portion electrodes becomes too large, and the first and second collecting powers become large. Even when the particulate matter is unevenly collected on the dust electrode, no spark discharge is generated from the particulate matter.

According to the third aspect of the present invention, the charging section electrodes arranged at intervals in the direction perpendicular to the flow direction of the flow path of the gas, and downstream of the flow path from the charging section electrodes,
A dust collecting portion electrode disposed at intervals in the direction perpendicular to the flow direction of the flow path, and having a tip of each projection of the charging portion electrode and an end of the dust collecting portion electrode on the upstream side in the flow direction. Between, a corona discharge is generated. Thereby, the dust collecting portion electrode can be used as an electrode for generating corona discharge, and the counter electrode for discharge provided in the conventional device is not required, and the number of electrodes is reduced. be able to. Therefore, the pressure loss of the gas can be reduced. Further, by arranging the dust collecting section electrode downstream of the charging section electrode in the gas flow direction, the charging section electrode and the dust collecting section electrode are partially overlapped in the direction perpendicular to the gas flow direction. In comparison with this, a portion in which the electrodes in the gas flow path are densely arranged is eliminated, thereby preventing an increase in gas pressure loss. Further, since the number of electrodes can be reduced, the configuration of the electric precipitator can be simplified, the production cost can be reduced, and the production can be facilitated. Further, the dust collecting portion electrode is arranged to be shifted from the charging portion electrode in the direction perpendicular to the gas flow direction, and can form a corona discharge region crossing the gas flow direction. As a result, even if corona discharge is generated using the dust collecting electrode disposed downstream of the charging section electrode, the gas passes across the corona discharge area, so that the particulate matter contained in the gas can be reliably removed. Can be charged. The charged particulate matter is collected on the dust collecting part electrode by Coulomb force. Therefore, even when the corona discharge is generated by the charging unit electrode and the dust collecting unit electrode arranged as described above, the particulate matter can be appropriately collected from the gas. In addition, the dust collecting section electrode is a flat plate-shaped electrode, can obtain a large dust collecting area, can increase the dust collecting efficiency, and is arranged along the gas flow direction, so that the dust collecting area is reduced. Even if the pressure is increased, the pressure loss of the gas is prevented from being greatly reduced.
In addition, since the particulate matter is collected only at the dust collecting portion electrode disposed downstream of the corona discharge region in the gas flow direction, even if an AC power supply is used as the corona discharge power source, the particulate matter is once charged and collected. The particulate matter collected on the electrodes is not discharged by AC corona discharge, and can be collected with high dust collection efficiency. Of course, a DC power supply can be used as the power supply for corona discharge. As a result, the degree of freedom in selecting a power supply that can be used as the power supply for corona discharge is increased, and the degree of freedom in designing the electric precipitator is increased.

In each projection, first projections and second projections are alternately formed, and the first projection and the second projection are discharged toward different dust collecting portion electrodes, and are generated from each projection. Corona discharges are prevented from interfering with each other. Thereby, a suitable corona discharge can be efficiently generated.

According to the fourth aspect of the present invention, the charging section electrodes arranged at intervals in the direction perpendicular to the flow direction of the flow path of the gas, and the charging section electrodes downstream of the flow path from the charging section electrodes,
A first dust collecting portion electrode arranged at intervals in a direction perpendicular to the flow direction of the flow path, and a tip of each projection of the charging portion electrode and an upstream side of the first dust collecting portion electrode in the flow direction. A corona discharge is generated between the ends. This makes it possible to use the first dust collecting portion electrode as an electrode for generating corona discharge, without requiring a counter electrode for discharge provided in a conventional device, and reducing the number of electrodes. Can be reduced. Therefore, the pressure loss of the gas can be reduced. Further, by disposing the first dust collecting portion electrode downstream of the charging portion electrode in the gas flow direction, the charging portion electrode and the first dust collecting portion electrode are partially overlapped in the direction perpendicular to the gas flow direction. As compared with the case where the electrodes are arranged in a vertical direction, the portion in which the electrodes in the gas flow path are densely arranged is eliminated, thereby preventing an increase in gas pressure loss. Further, since the number of electrodes can be reduced, the configuration of the electric precipitator can be simplified, the production cost can be reduced, and the production can be facilitated.

Further, the dust collecting portion electrode is located
The corona discharge region is arranged so as to be displaced in the direction perpendicular to the gas flow direction and crosses the gas flow direction. Even if a corona discharge is generated by using the dust collecting electrode arranged downstream of the charging unit electrode by this,
Since the gas passes across the corona discharge region, the particulate matter contained in the gas can be reliably charged. Further, a second dust collecting portion electrode is arranged between the first dust collecting portion electrodes, and a DC electric field is formed between the first and second dust collecting portion electrodes by an electric field forming power supply. The charged particulate matter is collected on one of the first and second dust collecting electrodes by the Coulomb force of the dust collecting electrode. At this time, different electric potentials are applied to the first and second dust collecting portion electrodes, and a large coulomb is applied to the particulate matter as compared with the case where the first and second dust collecting portion electrodes have the same potential. Force acts. Therefore, the particulate matter can be reliably collected.

As described above, even in a configuration in which the corona discharge is generated by the charging unit electrode and the dust collecting unit electrode arranged as described above, the particulate matter can be appropriately collected from the gas. In addition, the dust collecting portion electrode is a plate-shaped electrode, and can obtain a large dust collecting area, and is arranged along the gas flow direction. Therefore, even if the dust collecting area is increased, the gas pressure loss is reduced. A large drop is prevented.

Since the particulate matter is collected only at the dust collecting portion electrode located downstream of the corona discharge region in the gas flow direction, even if an AC power supply is used as the corona discharge power supply, the particulate matter is once charged. The particulate matter collected in the dust collecting portion electrode is not discharged by AC corona discharge, and can be collected with high dust collection efficiency. Of course, a DC power supply can be used as the power supply for corona discharge, and the degree of freedom in selecting a power supply that can be used as the power supply for corona discharge increases, and the degree of freedom in designing the electric dust collector increases. In each projection, a first projection and a second projection are formed alternately, and the first projection and the second projection are
Discharge is performed toward different dust collecting portion electrodes, and corona discharge generated from each projection is prevented from interfering with each other. Thereby, a suitable corona discharge can be efficiently generated.

According to the fifth aspect of the present invention, the charging section electrodes arranged at intervals in the direction perpendicular to the flow direction of the flow path of the gas, and at the downstream of the flow path from the charging section electrodes,
A first dust collecting portion electrode arranged at intervals in a direction perpendicular to the flow direction of the flow passage, and a second dust collecting portion arranged between the first dust collecting portion electrode downstream of the flow passage from the charging portion electrode. A corona discharge is generated between the tip of each projection of the charging unit electrode and the upstream end of the first and second dust collection unit electrodes in the flow direction. Thereby, it is possible to use the first and second dust collecting portion electrodes as electrodes for generating corona discharge, without requiring a counter electrode for discharge provided in a conventional device, The number of electrodes can be reduced. Therefore, the gas pressure loss is reduced,
Operation efficiency can be improved. Further, by disposing the first and second dust collecting portion electrodes downstream of the charging portion electrode in the gas flow direction, the charging portion electrode and the first and second dust collecting portion electrodes are disposed.
Compared to the case where the dust collecting part electrode is partially overlapped in the direction perpendicular to the gas flow direction, the portion in which the electrodes in the gas flow path are densely arranged is eliminated, thereby reducing the gas pressure loss. Can be prevented from becoming large. Further, since the number of electrodes can be reduced, the configuration of the electric precipitator can be simplified, the production cost can be reduced, and the production can be facilitated. In addition, the dust collecting section electrode
The corona discharge region is arranged so as to be displaced in the direction perpendicular to the gas flow direction with respect to the charging unit electrode, and crosses the gas flow direction. As a result, even if corona discharge is generated using the dust collecting electrode disposed downstream of the charging section electrode, the gas passes across the corona discharge area, so that the particulate matter contained in the gas can be reliably removed. Can be charged. A DC electric field is formed between the first and second dust collecting portion electrodes by an electric field forming power supply. The charged particulate matter is collected on one of the first and second dust collecting electrodes by the Coulomb force of the dust collecting electrode. At this time, different electric potentials are applied to the first and second dust collecting portion electrodes, and a large coulomb is applied to the particulate matter as compared with the case where the first and second dust collecting portion electrodes have the same potential. Force acts. Therefore, the particulate matter can be reliably collected.

As described above, even when the corona discharge is generated by the charging unit electrode and the dust collecting unit electrode arranged as described above, the particulate matter can be appropriately collected from the gas. In addition, the dust collecting portion electrode is a plate-shaped electrode, and can obtain a large dust collecting area, and is arranged along the gas flow direction. Therefore, even if the dust collecting area is increased, the gas pressure loss is reduced. A large drop is prevented. In addition, since the particulate matter is collected only at the dust collecting portion electrode disposed downstream of the corona discharge region in the gas flow direction, even if an AC power supply is used as the corona discharge power source, the particulate matter is once charged and collected. The particulate matter collected on the electrodes is not discharged by AC corona discharge, and can be collected with high dust collection efficiency. Of course, a DC power supply can be used as the power supply for corona discharge, and the degree of freedom in selecting a power supply that can be used as the power supply for corona discharge increases, and the degree of freedom in designing the electric dust collector increases.
In each projection, a first projection and a second projection are alternately formed, and the first projection and the second projection are discharged toward different dust collecting portion electrodes, and corona discharge generated from each projection is generated. Interference with each other is prevented. Thereby, a suitable corona discharge can be efficiently generated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electric precipitator 20 according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing the vicinity of an end portion 39 on the upstream side in a flow direction B of a charging unit electrode 22 and a dust collecting unit electrode 23 in FIG.

FIG. 3 is a bottom view as viewed from below in FIG. 2;

FIG. 4 shows each of the electric precipitators 70 and 80 shown in FIGS.
FIG. 4 is an enlarged cross-sectional view showing the vicinity of an end portion 51 on the downstream side in the flow direction B of the charging portion electrode 50 and an end portion 39 on the upstream side in the flow direction B of the dust collecting portion electrode 23 which can be provided in place of the charging portion electrode 22 in FIG. It is.

FIG. 5 is a bottom view as viewed from below in FIG. 4;

FIG. 6 shows each of the electric precipitators 70 and 80 shown in FIGS.
FIG. 4 is an enlarged cross-sectional view showing the vicinity of an end 39 on the upstream side in the flow direction B of the charging unit electrode 55 and the dust collecting unit electrode 23 which can be provided in place of the charging unit electrode 22 in FIG.

FIG. 7 shows each of the electric precipitators 70 and 80 shown in FIGS.
FIG. 4 is an enlarged cross-sectional view showing an end 61 on the downstream side in the flow direction B of the charging unit electrode 60 and an end 39 on the upstream side in the flow direction B of the dust collecting unit electrode 23, which can be provided in place of the charging unit electrode 22 in FIG. It is.

FIG. 8 shows each of the electric precipitators 70 and 80 shown in FIGS.
FIG. 3 is an enlarged cross-sectional view showing an end 66 on the downstream side in the flow direction B of the charging unit electrode 65 and an end 39 on the upstream side in the flow direction B of the dust collecting unit electrode 23 which can be provided in place of the charging unit electrode 22 in FIG. It is.

FIG. 9 is a sectional view showing an electric precipitator 70 according to another embodiment of the present invention.

FIG. 10 is a graph showing output voltages of a power supply for corona discharge 24 and a power supply for electric field formation 72;

FIG. 11 is a sectional view showing an electric precipitator 80 according to still another embodiment of the present invention.

FIG. 12 is a graph showing output voltages of a corona discharge power supply 24 and electric field formation power supplies 83 and 84.

FIG. 13 is a simplified cross-sectional view of a conventional electric precipitator 1;

[Explanation of symbols]

 20, 70, 80 Electric dust collector 21 Housing 22, 50, 55, 60, 65 Charging part electrode 23, 71, 81, 82 Dust collecting part electrode 24 Power supply for corona discharge 32 Charging part 33 Dust collecting part 40 Projection 72, 83,84 Power supply for electric field formation

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B03C 3/00-3/88

Claims (5)

(57) [Claims] 1. A charging unit electrode disposed in a flow path through which a gas containing particulate matter to be collected flows in a direction perpendicular to the flow direction of the flow path; Downstream of the path, a flat plate-shaped first dust collector that is arranged at an interval in a direction perpendicular to the flow direction of the flow path and is shifted from the charging unit electrode in the vertical direction and extends along the flow direction. An electrode, a power supply for corona discharge that generates a corona discharge between the charging unit electrode and the upstream end of the first dust collection unit electrode in the flow direction, downstream of the charging unit electrode in the flow path, A DC electric field is formed between the first dust collector electrode and the second flat dust collector electrode, which is disposed between the first dust collector electrodes in the vertical direction and extends along the flow direction. The corona discharge power supply is an AC power supply, and the first dust collecting portion electrode An electric precipitator, wherein the power supply for forming an electric field has an output voltage having an absolute value smaller than an amplitude voltage of the power supply for corona discharge. 2. A charging unit electrode disposed in a flow path through which a gas containing particulate matter to be collected flows in a direction perpendicular to the flow direction of the flow path; Downstream of the path, a flat plate-shaped first dust collector that is arranged at an interval in a direction perpendicular to the flow direction of the flow path and is shifted from the charging unit electrode in the vertical direction and extends along the flow direction. An electrode, a charging unit electrode is disposed downstream of the flow path from the charging unit electrode, between the vertical directions of the first dust collection unit electrode, in a manner displaced from the charging unit electrode in the vertical direction, and extends along the flow direction. A corona discharge power supply for generating a corona discharge between the charging unit electrode and the upstream end of the first and second dust collection unit electrodes in the flow direction; An electric field forming power supply for forming a DC electric field between the first and second dust collecting portion electrodes; The power supply is an AC power supply, the first dust collector electrode is grounded, and the electric field forming power supply has an output voltage having an absolute value less than the amplitude voltage of the corona discharge power supply, 2. An electric precipitator, wherein voltages of opposite polarities are applied to the precipitator electrodes. 3. A flat plate that is arranged in a flow path through which a gas containing particulate matter to be collected flows in a direction perpendicular to the flow direction of the flow path and extends along the flow direction of the flow path. A charging section electrode having a plurality of substantially triangular protrusions formed at an end portion on the downstream side in the flow direction; and a downstream of the flow path from the charging section electrode and perpendicular to a flow direction of the flow path. A plate-shaped dust-collecting electrode that is arranged at an interval in the direction and is offset from the charging unit electrode in the vertical direction and extends along the flow direction; a tip of each protrusion of the charging unit electrode and a dust-collecting unit A power supply for corona discharge that generates corona discharge between the flow direction upstream end of the electrode and a corona discharge power supply, wherein each of the protrusions is inclined in one thickness direction of the charging unit electrode and is adjacent to the charging unit electrode. A first protrusion protruding toward one side of the two dust collecting portion electrodes; A second protrusion that is inclined to the other side in the thickness direction and protrudes toward the other of the two dust collecting portion electrodes adjacent to the charging portion electrode, wherein the first and second protrusions are alternately formed, and The first adjacent to
An electrostatic precipitator, wherein corona discharges generated from the projections and the second projections are prevented from interfering with each other. 4. A flat plate that is disposed in a flow path through which a gas containing particulate matter to be collected flows in a direction perpendicular to the flow direction of the flow path and extends along the flow direction of the flow path. A charging unit power source having a plurality of substantially triangular protrusions formed at an end of the flow channel on the downstream side in the flow direction; and a flow of the flow channel downstream of the flow channel from a charging unit electrode. A plate-shaped first dust-collecting electrode that is arranged at an interval in the vertical direction and that is offset from the charging unit electrode in the vertical direction, and extends along the flow direction; A power supply for corona discharge that generates a corona discharge between a tip and an end of the first dust collecting portion electrode on the upstream side in the flow direction; a first dust collecting portion downstream of the flow path from a charging portion electrode; A plate-shaped second dust collector electrode disposed between the electrodes in the vertical direction and extending along the flow direction; An electric field forming power supply for forming a DC electric field between the first and second dust collecting section electrodes, wherein each of the protrusions is inclined in one thickness direction of the charging section electrode and is adjacent to the charging section electrode. A first projection protruding toward one side of the first dust collecting portion electrode and a first projection inclined toward the other side in the thickness direction of the charging portion electrode and the other of the two first dust collecting portion electrodes adjacent to the charging portion electrode. A second projection protruding toward the first projection, and the first and second projections are formed alternately to prevent corona discharges generated from the first projection and the second projection adjacent to each other from interfering with each other. An electrostatic precipitator, which is separated. 5. A flat plate which is disposed in a flow path through which a gas containing particulate matter to be collected flows in a direction perpendicular to the flow direction of the flow path, and extends along the flow direction of the flow path. A charging unit electrode having a plurality of substantially triangular protrusions formed at an end on the downstream side in the flow direction of the flow channel; and a flow of the flow channel downstream of the flow channel from the charging unit electrode. A first dust collecting unit electrode having a flat plate shape, which is arranged at a distance in the vertical direction and is shifted from the charging unit electrode in the vertical direction, and extends along the flow direction; Downstream of the road, between the vertical direction of the first dust collecting unit electrode, the charging unit electrode is disposed to be shifted in the vertical direction, and a plate-shaped second dust collecting unit electrode extending along the flow direction. A tip of each projection of the charging unit electrode and an end of the first and second dust collecting unit electrodes on the upstream side in the flow direction; A corona discharge power supply for generating a corona discharge, and an electric field forming power supply for forming a DC electric field between the first and second dust collecting portion electrodes, wherein each of the protrusions has a thickness of a charging portion electrode. A first projection that is inclined in one direction and protrudes toward the first dust collection electrode adjacent to the charging unit electrode, and a second dust collection that is inclined to the other side in the thickness direction of the charging unit electrode and adjacent to the charging unit electrode. And a second protrusion protruding toward the unit electrode, wherein the first and second protrusions are formed alternately, and corona discharges generated from the first and second protrusions adjacent to each other interfere with each other. An electrostatic precipitator characterized in that it is prevented from being damaged.