WO2020166960A1

WO2020166960A1 - Dbd plasma air purifier and exhaust gas reducing device

Info

Publication number: WO2020166960A1
Application number: PCT/KR2020/001960
Authority: WO
Inventors: 박영민; 노정욱
Original assignee: 주식회사 가교테크
Priority date: 2019-02-13
Filing date: 2020-02-12
Publication date: 2020-08-20
Also published as: KR102051986B1; KR101980876B1

Abstract

The present invention relates to an air purifier using plasma technology. A DBD plasma air purifier according to the present invention, which is electrically connected to each of a voltage supply unit for supplying an alternating current voltage and a current supply unit for supplying a current, comprises: a first electrode part formed to extend in one direction and electrically connected to a first electrode of the voltage supply unit; a second electrode part having a hollow part in which the first electrode part is disposed, the second electrode part being electrically connected to a second electrode of the voltage supply unit; and a dielectric part disposed between the first electrode part and the second electrode part such that a first electric field having a first directivity is formed in the hollow part, on the basis of the fact that the alternating current voltage is supplied to the first electrode part and the second electrode part.

Description

DBD plasma air purifier and smoke reduction device

The present invention relates to an air purifier using plasma technology.

Recently, as air pollution including fine dust has emerged as a social problem, various attempts have been made to solve such air pollution. Air pollution is caused by particulate matter (PM) suspended in the air, and these particulate pollutants are mostly generated from combustors used in industrial activities and transportation.

Therefore, in order to remove such pollutants, plasma technology has been applied to various types of air pollution reduction technologies such as electric precipitator, desulfurization facility, low NOx burner, SCR, etc. Has been studied.

Contaminant removal technology using plasma (or harmful gas treatment technology) is a harmful gas treatment technology using low-temperature plasma, a harmful gas treatment technology using a dielectric barrier discharge (DBD) plasma, and a rotating gliding arc plasma. There are harmful gas treatment technologies using

An object of the present invention is to provide a smoke reduction apparatus and an air purifier using DBD plasma.

In particular, the present invention is to provide an air purifier using DBD plasma and a driving method thereof, which can further improve exhaust emission reduction efficiency than a method using a conventional DBD plasma.

Furthermore, the present invention provides an air purifier using DBD plasma and a driving method thereof, which can reduce power consumption and improve exhaust emission reduction efficiency compared to a method using a conventional DBD plasma.

According to the present invention, the DBD plasma air purifier, which is electrically connected to a voltage supply unit supplying an AC voltage and a current supply unit supplying current, is formed to extend in one direction, and is electrically connected to the first electrode of the voltage supply unit. A first electrode unit; A second electrode portion having a hollow portion in which the first electrode portion is disposed and electrically connected to a second electrode of the voltage supply portion; And between the first electrode part and the second electrode part so that a first electric field having a first direction is formed in the hollow part based on the AC voltage being supplied to the first electrode part and the second electrode part. A dielectric portion disposed in the; And a second electric field different from the first electric field by the current supplied from the current supply unit is formed in the hollow portion.

In an embodiment, in the first electrode part and the second electrode part, by the current supplied from the current supply part, a current having a moving direction of charge opposite to a moving direction of charge formed by the AC voltage It is characterized by being formed with a specific period.

In an embodiment, when a current having a moving direction of charges opposite to a moving direction of charges formed by the AC voltage is formed in the first electrode unit and the second electrode unit, the direction of the second electric field Is characterized in that corresponding to the first direction of the first electric field.

In an embodiment, the current supplied from the current supply unit is a direct current, and in the second electric field having a direction corresponding to the first direction, a positive voltage is applied to the first electrode unit and the second electrode unit Or when a negative voltage is applied to the first and second electrode portions, it is formed only in one case.

In an embodiment, the second electrode portion has one end and the other end, and the intensity of the second electric field is in a region corresponding to the one end and the other end than in a central region of the hollow portion provided in the second electrode. It is characterized by being stronger.

According to another example of the present invention, a DBD plasma air purifier electrically connected to a voltage supply unit supplying an AC voltage having a preset period is formed to extend in one direction, and is electrically connected to the first electrode of the voltage supply unit. A first electrode unit; A second electrode portion having a hollow portion in which the first electrode portion is disposed and electrically connected to a second electrode of the voltage supply portion; A dielectric portion disposed between the first electrode portion and the second electrode portion to form an electric field in the hollow portion based on the AC voltage being supplied to the first electrode portion and the second electrode portion; And a control unit for controlling the AC voltage supplied from the voltage supply unit such that AC voltages having different voltage levels are applied to the first and second electrode units within the preset period, wherein the electric field of the hollow portion, Based on the AC voltage having the different voltage levels, it is characterized in that it is varied to have different strengths within the preset period.

In an embodiment, a first AC voltage having a first voltage level is supplied to the first and second electrode units during a first period within the preset period, and to the first and second electrode units, the A second AC voltage having a second voltage level lower than the first voltage level is supplied during a second period different from the first period within a preset period.

In an embodiment, in the hollow portion, based on the first AC voltage being supplied, a first electric field is formed, and based on the second AC voltage being supplied, a second electric field having a different strength than the first electric field 2 It is characterized in that an electric field is formed.

In an embodiment, the first and second electric fields are characterized in that they have directions corresponding to each other.

In an embodiment, the AC voltage is characterized in that it includes a first pulse wave having the first voltage level during the first period and a second pulse wave having the second voltage level during the second period. .

In an embodiment, the alternating current voltages having different voltage levels are repeatedly supplied alternately, and changes in the electric field of the hollow portion converge in a constant pattern.

According to the DBD plasma air purifier and the driving method thereof according to the present invention, an electric field capable of increasing the soot reduction efficiency can be additionally formed by supplying additional current to the electrode.

Further, according to the DBD plasma air purifier and the driving method thereof according to the present invention, by repeatedly changing the supplied voltage level, the intensity of the electric field can be varied to increase the soot reduction efficiency. In addition, according to the present invention, it is possible to reduce power consumption for driving the DBD plasma air purifier by repeatedly changing the supplied voltage level.

1 and 2 are conceptual diagrams illustrating an apparatus for reducing DBD plasma smoke according to the present invention.

3 is a conceptual diagram illustrating a voltage supply method of the DBD plasma exhaust emission reduction apparatus according to the present invention.

4A, 4B and 4C are conceptual diagrams for explaining a current supply method of the DBD plasma exhaust emission reduction apparatus according to the present invention.

5A, 5B, 5C, 5D, 6A, 6B, 6C, and 6D are conceptual diagrams for explaining an electric field formed in the DBD plasma exhaust emission reduction apparatus according to the present invention.

7, 8, 9 and 10 are conceptual diagrams for explaining a DBD plasma exhaust emission reduction apparatus according to another example of the present invention.

11 is a conceptual diagram illustrating an electric field formed in a DBD plasma exhaust emission reduction apparatus according to another example of the present invention.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are denoted by the same or similar reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used interchangeably in consideration of only the ease of preparation of the specification, and do not have meanings or roles that are distinguished from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, when it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all modifications included in the spirit and scope of the present invention It should be understood to include equivalents or substitutes.

The present invention provides a soot reduction device and a driving method of the soot reduction device using DBD plasma, which can further improve the soot reduction efficiency than the method using the conventional DBD plasma. Hereinafter, the present invention together with the accompanying drawings. The DBD plasma exhaust emission reduction device according to this will be described in more detail.

1 and 2 are conceptual diagrams for explaining the DBD plasma smoke reduction apparatus according to the present invention, and FIG. 3 is a conceptual diagram for explaining a voltage supply method of the DBD plasma smoke reduction apparatus according to the present invention. And, Figures 4a, 4b and 4c are conceptual diagrams for explaining a current supply method of the DBD plasma exhaust emission reduction apparatus according to the present invention.

As shown in FIG. 1, the DBD plasma smoke reduction apparatus 100 according to the present invention includes a harmful gas passing through the DBD plasma smoke reduction apparatus 100 through a dielectric barrier discharge (DBD). Gas) is characterized in that the purified gas (or clean gas) is discharged by ionizing. For example, the DBD plasma smoke reduction apparatus 100 according to the present invention converts contaminants such as NOx and SOx into safe materials by ionizing them using ionic molecules generated due to dielectric barrier discharge. .

On the other hand, in the DBD plasma smoke reduction apparatus 100 according to the present invention, the dielectric barrier discharge causes plasma chemistry in which a chemical reaction starts when electrons collide with gas molecules around it, and at this time, the plasma chemistry is electron It depends on the size of the electric field that supplies kinetic energy to the children.

As described above, as the intensity of the electric field increases, the plasma chemical reaction occurs more easily, and as a result, the soot reduction efficiency may increase. Accordingly, the present invention proposes a DBD plasma exhaust emission reduction apparatus capable of increasing the intensity of an electric field within a limited voltage.

On the other hand, the exhaust gas reduction device proposed in the present specification may be an exhaust gas treatment device such as a vehicle or a ship, an air purifier or a ventilation device used for home or industrial use. In this case, the smoke reduction apparatus may have a single DBD plasma reactor, or may have a structure in which a plurality of DBD plasma reactors are disposed in bundles. However, in this specification, for convenience of description, a single DBD plasma reactor is exemplified as an exhaust emission reduction device.

As shown in FIG. 2, the DBD plasma smoke reduction apparatus 100 according to the present invention is configured to be electrically connected to the voltage supply unit 210 and the current supply unit 220.

Here, at least one of the voltage supply unit 210 and the current supply unit 220 may be provided separately from the DBD plasma emission reduction apparatus 100 according to the present invention.

Alternatively, at least one of the voltage supply unit 210 and the current supply unit 220 may be provided together with the DBD plasma exhaust emission reduction apparatus 100 according to the present invention.

In this case, the DBD plasma smoke reduction apparatus 100 according to the present invention may further include at least one of the voltage supply unit 210 and the current supply unit 220 as a component. In the following description, the voltage supply unit 210 and the current supply unit 220 are provided separately or together with the DBD plasma emission reduction apparatus 100 without any particular limitation, and will be described in common.

The DBD plasma emission reduction apparatus 100 according to the present invention includes a first electrode unit 110, a second electrode unit 120, and a dielectric unit 130.

In the present invention, the first electrode unit 110 is formed to extend in one direction, as illustrated, and is configured to be electrically connected to the first electrode 210a of the voltage supply unit 210.

The first electrode unit 110 may have various shapes, and as an example, it may be formed in a cylindrical shape as illustrated. Meanwhile, although not shown, the first electrode unit 110 may include a plurality of sub-electrodes, and these sub-electrodes may be formed to extend in the one direction in which the first electrode unit 110 extends. have. Such a plurality of sub-electrodes may also have various shapes, and as an example, may be formed in a cylindrical shape.

Next, the second electrode unit 120 includes a hollow portion in which the first electrode unit 110 is disposed, and is configured to be electrically connected to the second electrode 210b of the voltage supply unit.

The second electrode unit 120 may have various shapes including a hollow portion, and as an example, may have a cylindrical shape as shown in the figure. The second electrode unit 120 is also formed to extend in the one direction.

A dielectric portion 130 is disposed between the first electrode portion 110 and the second electrode portion 120. Dielectric barrier discharge is generated based on the application of voltage and current to the first and

second electrode units

110 and 120 by the dielectric unit 130.

The dielectric part 130 may be disposed on one surface of the second electrode part 120, and the one surface may be a surface facing the first electrode part 110.

When the voltage is supplied from the voltage supply unit 210 to the first electrode unit 110 and the second electrode unit 120, the dielectric unit 130 causes a first direction having a first direction in the hollow part. An electric field is formed.

In addition, a second electric field different from the first electric field may be formed in the hollow portion of the second electrode unit 220 by the current supplied from the current supply unit 220.

The voltage supplied from the voltage supply unit 210 to the DBD plasma smoke reduction apparatus 100 according to the present invention is made of an AC voltage.

That is, the voltage supply unit 210 is configured to supply an AC voltage, has a preset period, and is configured to repeatedly supply a positive voltage and a negative voltage to the first and

second electrode units

110 and 120.

When a positive voltage is applied to the first and

second electrode units

110 and 120, the direction of movement of electric charges moves from the first electrode unit 110 to the second electrode unit 120, and the first electrode unit A radial electric field radiated toward the second electrode unit 120 at 110 may be formed.

In contrast, when a negative voltage is applied to the first and

second electrode units

110 and 120, the direction of movement of electric charges moves from the second electrode unit 120 to the first electrode unit 120, An electric field radiated from the second electrode unit 120 toward the first electrode unit 110 may be formed.

Looking at the voltage supply unit 210 in more detail, the method of supplying the AC voltage from the voltage supply unit 210 may be very various, and the voltage supply unit 210 is from a DC voltage (DC voltage), an AC voltage (AC voltage) ) May include a circuit that generates. As an example, as shown in (a) of FIG. 3, the voltage supply unit 210 may supply an AC voltage to the DBD plasma smoke reduction apparatus 100 in a full bride method.

In addition, as shown in (b) of Figure 3, the voltage supply unit 210 is a half-bridge method, supplying an AC voltage to the DBD plasma soot reduction device 100, or also shown in Figure 3 (c) As described above, the voltage supply unit 210 may supply an AC voltage to the DBD plasma emission reduction apparatus 100 in a two-switch Flayback method.

Furthermore, as shown in (d) of FIG. 3, the voltage supply unit 210 may supply an AC voltage to the DBD plasma smoke reduction apparatus 100 in a One-Switch Flyback method.

Regions corresponding to 310, 320, 330, and 340, respectively, in FIGS. 3A to 3D show that the DBD plasma emission reduction apparatus 100 according to the present invention is connected as a load.

Next, looking at the current supply unit 220 in more detail, the current supply unit 220 may be configured to supply an alternating current or a direct current.

First, looking at the current supply unit 220 for supplying the AC current, the method of supplying the AC current from the current supply unit 220 is a direct current (DC current), as shown in (a) and (b) of Fig. 4a. ), it may include a circuit that generates an alternating current (AC current). In (a) and (b) of FIG. 4A, regions corresponding to 410 and 420, respectively, are shown as loads to which the DBD plasma smoke reduction apparatus 100 according to the present invention is connected. As shown in FIG. 4B, the current supplied from the current supply unit 220 may be an AC current having a preset period.

In the present invention, the AC voltage supplied through the voltage supply unit 210 is supplied with a first cycle, and the AC current supplied through the current supply unit 220 has a second cycle and may be supplied. Here, the first period and the second period may be the same period or may be different periods.

Meanwhile, as shown in FIG. 4C, the current supply unit 220 may also be configured to supply a DC current.

Meanwhile, the current supply unit 220 may be configured to supply a direct current, and in the present invention, regardless of the alternating current and the direct current, the first electric field generated by the AC voltage supplied from the voltage supply unit 210 2 is made to form an electric field.

Hereinafter, a method of forming an electric field by voltage and current supplied by the voltage supply unit 210 and the current supply unit 210 will be described in more detail with reference to the accompanying drawings. 5A, 5B, 5C, 5D, 6A, 6B, 6C, and 6D are conceptual diagrams for explaining an electric field formed in the DBD plasma exhaust emission reduction apparatus according to the present invention. Meanwhile, FIGS. 5B, 5C, and 5D are plan views as viewed from the direction A-A′ of the DBD plasma exhaust emission reduction apparatus according to the present invention.

First, a method of forming the first electric field by the voltage supply unit 210 will be described in more detail. The voltage supplied from the voltage supply unit 210 is formed of an AC voltage. That is, the voltage supply unit 210 is configured to supply an AC voltage, has a preset period, and is configured to repeatedly supply a positive voltage and a negative voltage to the first and

second electrode units

110 and 120.

Accordingly, the first electric field generated by the voltage supply unit 210 is when a positive voltage 510 (refer to FIG. 5B) is supplied from the voltage supply unit 210 and a negative voltage 520 (refer to FIG. 5B) is supplied. When they have opposite directions.

First, looking at when a positive voltage 510 (refer to FIG. 5B) is applied from the voltage supply unit 210, the first electrode 210a of the voltage supply unit 210 is a positive electrode and a second electrode 210b. ) Can be made of a negative (-) electrode. In this case, between the first electrode unit 110 electrically connected to the first electrode 210a and the second electrode unit 120 electrically connected to the second electrode 210b, the first electrode unit 110 2 A potential difference to the electrode unit 120 occurs. That is, the electric potential of the first electrode unit 110 is higher than the electric potential of the second electrode unit 120, and thus, the moving direction of the electric charge moves from the first electrode unit 110 to the second electrode unit 120. . As a result, a radial electric field radiated from the first electrode unit 110 toward the second electrode unit 120 may be formed. In the present invention, the electric field formed by the voltage supply unit 210 may be referred to as the first electric field E1.

Here, the first electric field E1 has one direction from the first electrode unit 110 to the second electrode unit 120 in the x-y plane, and forms a radial shape.

On the other hand, while a positive voltage is applied by the voltage supply unit 210, in the present invention, as shown in FIG. 5A, a current supply unit (in the direction B-B′) flows through the second electrode unit 120 220) can be supplied with current.

While a positive voltage is applied from the voltage supply unit 210, a current flowing through the second electrode unit 120 by the voltage supply unit 210 may be formed in a first direction corresponding to C-C′.

In the present specification, for convenience of description, the C-C' direction will be referred to as a "first direction" and the B-B' direction will be referred to as a "second direction".

At this time, in the present invention, using the current supply unit 220, the current is supplied to the second electrode unit 120 in a second direction (B-B') opposite to the first direction (C-C'). By supplying, a second electric field E2 corresponding to a direction corresponding to the direction of the first electric field E1 is formed.

Herein, that it corresponds to the direction of the first electric field E1 may mean the same direction as the direction of the first electric field E1.

In the DBD plasma smoke reduction apparatus 100 according to the present invention, a movement direction (or a current flow direction, C-C') formed by the AC voltage by the current supplied from the current supply unit 220 A current having a movement direction (or a current flow direction, B-B′) opposite to that of the current may flow with a specific period.

5C shows a case where the AC current by the current supply unit 220 flows in the B-B direction.

More specifically, when a current flows through the second electrode unit 220 in the second direction (B-B'), a magnetic field B may be formed in a counterclockwise direction as shown in FIG. 5C. . As illustrated in FIG. 5C, when the positive current 530 flows in the second electrode unit 120, a current is formed in the second direction B-B'.

In this way, when the counterclockwise magnetic field B is formed, the second electric field E2 from the first electrode unit 110 to the second electrode unit 120 is formed.

That is, in the present invention, the direction of movement of charges (or direction of flow of current, second direction) opposite to the direction of movement of charges (or direction of current, first direction, C-C′) formed by the AC voltage By supplying a current having B-B'), a second electric field E2 is additionally created.

Meanwhile, the second electrode unit 120 has one end and the other end, and the strength of the second electric field E2 formed by the current supply unit 220 is It may be formed stronger in the regions (openings, 140, 150) corresponding to the one end and the other end than in the central region of the hollow part.

Further, as described above, the AC voltage supplied through the voltage supply unit 210 may be supplied at a first period, and the AC current supplied through the current supply unit 220 may be supplied at a second period. Here, when the first period and the second period are the same period, ideally, the direction of the electric field formed by the voltage supply unit 210 and the direction of the electric field formed by the current supply unit 220 may be identical. .

Further, when the first period of the AC voltage supplied from the voltage supply unit 210 and the second period of the AC current supplied from the current supply unit 220 are different from each other, a second period having the same direction as the first electric field E1 In the electric field E2, a positive voltage is applied from the voltage supply unit 210 to the first and

second electrode units

110 and 120, and the second direction (B-B') as previously described by the current supply unit 220 Can be formed while current flows.

As described above, the DBD plasma smoke reduction apparatus 100 according to the present invention includes a first electric field E1 and a current formed based on receiving a voltage from the voltage supply unit 210, as shown in FIG. 5D. Since the second electric field E2, which is formed based on receiving current from the supply unit 220, is formed together, the intensity of the electric field can be formed larger than that of the conventional DBD plasma exhaust emission reduction apparatus. Therefore, as the intensity of the electric field increases, chemical reactions with gas molecules corresponding to pollutants may occur more easily.

In the above example, a case where a positive voltage is applied to the first and

second electrode units

110 and 120 has been described, but in the following, a negative voltage is applied to the first and

second electrode units

110 and 120 Let's look at the formation of the electric field when it is formed.

As described above, the voltage supplied from the voltage supply unit 210 is made of an AC voltage. That is, the voltage supply unit 210 is configured to supply an AC voltage, has a preset period, and is configured to repeatedly supply a positive voltage and a negative voltage to the first and

second electrode units

110 and 120.

Therefore, the first electric field generated by the voltage supply unit 210 is when a positive voltage 510 (see FIGS. 5B and 6B) is supplied from the voltage supply unit 210 and a negative voltage 520 (see FIG. 5B). When supplied, they have opposite directions.

Looking at a time when a negative voltage 520 (refer to FIGS. 5B and 6B) is applied from the voltage supply unit 210, in the voltage supply unit 210, the first electrode 210a is a negative electrode and a second electrode (210b) forms a positive electrode. In this case, between the first electrode unit 110 electrically connected to the first electrode 210a and the second electrode unit 120 electrically connected to the second electrode 210b, the second electrode unit 120 1 A potential difference to the electrode part 110 occurs. That is, the potential of the second electrode unit 120 is higher than the potential of the first electrode unit 110, and thus, the direction of movement of the charge moves from the second electrode unit 120 to the first electrode unit 110 . As a result, a radial electric field E1' radiated from the second electrode unit 120 toward the first electrode unit 110 may be formed.

As described above, the electric field formed by the voltage supply unit 210 may be referred to as a first electric field E1'.

When a negative voltage is supplied, the first electric field E1 ′ has one direction from the second electrode unit 120 to the first electrode unit 110 in the x-y plane, and forms a radial shape.

Meanwhile, while a negative voltage is supplied by the voltage supply unit 210, in the present invention, as shown in FIG. 6B, a current is applied to the second electrode unit 120 in the first direction (C-C′ direction). Current may be supplied from the current supply unit 220 to flow.

While a negative voltage is supplied from the voltage supply unit 210, a current flowing through the second electrode unit 120 by the voltage supply unit 210 may be formed in a second direction corresponding to B-B′. In this case, in the present invention, current is supplied to the second electrode unit 120 in a first direction (C-C') opposite to the second direction (B-B') using the current supply unit 220. By supplying, a second electric field E2' corresponding to a direction corresponding to the direction of the first electric field E1' is formed.

Herein, that it corresponds to the direction of the first electric field E1 ′ may mean that it is the same direction as the direction of the first electric field E1 ′.

In the DBD plasma smoke reduction apparatus 100 according to the present invention, by the current supplied from the current supply unit 220, the movement direction of the electric charge formed by the AC voltage (or the flow direction of the current, the second direction, B -B'), a current having a moving direction (or a current flow direction, a first direction, C-C') opposite to that of the current may flow with a specific period.

6C shows a case in which the AC current by the current supply unit 220 flows in the C-C' direction (first direction).

More specifically, when a current flows in the first direction (C-C') through the second electrode unit 220, a magnetic field B'may be formed in a clockwise direction as shown in FIG. 6C. . As shown in FIG. 6C, when the negative current 540 flows in the second electrode unit 120, a current is formed in a first direction C-C'.

In this way, when the magnetic field B'in the clockwise direction is formed, a second electric field E2' from the second electrode unit 120 to the first electrode unit 110 is formed.

That is, in the present invention, the direction of movement of charges (or direction of flow of current, first direction) opposite to the direction of movement of charges formed by the alternating voltage (or direction of current, second direction, B-B') By supplying a current having C-C'), a second electric field E2' is additionally created.

Meanwhile, the second electrode unit 120 has one end and the other end, and the strength of the second electric field E2' formed by the current supply unit 220 is provided in the second electrode unit 120. It may be formed stronger in the

regions

140 and 150 corresponding to the one end and the other end than in the central region of the hollow part.

Further, when the first period of the AC voltage supplied from the voltage supply unit 210 and the second period of the AC current supplied from the current supply unit 220 are different from each other, a second period having the same direction as the first electric field E1 In the electric field E2, negative voltages are applied to the first and

second electrode units

110 and 120 from the voltage supply unit 210, and the first direction (C-C′) as previously described by the current supply unit 220 Can be formed while current flows.

As described above, the DBD plasma smoke reduction apparatus 100 according to the present invention includes a first electric field E1' formed based on receiving a voltage from the voltage supply unit 210, as shown in FIG. 6D. Since the second electric field E2 ′, which is formed based on receiving current from the current supply unit 220, is formed together, the strength of the electric field can be formed larger than that of a conventional DBD plasma smoke reduction device. Therefore, as the intensity of the electric field increases, chemical reactions with gas molecules corresponding to pollutants may occur more easily.

On the other hand, as described above, in the DBD plasma exhaust emission reduction apparatus 100 according to the present invention, the current supply unit 220 may also supply a DC current.

In this case, the additional second electric fields E2 and E2' may be generated only from one of a positive voltage and a negative voltage supplied from the voltage supply unit 210.

More specifically, when the current supplied from the current supply unit 220 is a direct current, a second electric field having a direction corresponding to the first direction of the first electric field formed by the voltage supplied from the voltage supply unit 210 is , A positive voltage is applied to the first electrode part and the second electrode part, or a negative voltage is applied to the first and second electrode parts.

As described above, the DBD plasma reduction apparatus according to the present invention may increase the soot reduction efficiency by additionally forming an electric field by adding a current source. Therefore, the DBD plasma reduction apparatus according to the present invention can be applied to transportation means such as vehicles and ships, and further, it can be applied to various industrial fields such as air purifiers and water quality improvement devices.

In the above embodiments, a method of increasing the efficiency of the soot reduction device by additionally supplying current has been described. In another embodiment of the present invention, a method of increasing the efficiency of a soot reduction device is proposed by controlling the voltage, and in particular, soot reduction using DBD plasma that can reduce power consumption and improve soot reduction efficiency. It provides an apparatus and a method of driving a smoke reduction apparatus. Hereinafter, together with the accompanying drawings, a method of increasing the efficiency of the exhaust emission reduction device with low power will be described in more detail. 7, 8, 9, and 10 are conceptual diagrams for explaining a DBD plasma smoke reduction apparatus according to another example of the present invention, and FIG. 11 is an electric field formed in a DBD plasma smoke reduction apparatus according to another example of the present invention. It is a conceptual diagram for explaining.

As shown in FIG. 7, the DBD plasma smoke reduction apparatus 700 according to the present invention is made to be electrically connected to the voltage supply unit 810.

Here, the voltage supply unit 800 may be provided separately from the DBD plasma smoke reduction apparatus 100 according to the present invention. Alternatively, the voltage supply unit 800 may be provided together with the DBD plasma emission reduction apparatus 700 according to the present invention.

In this case, the DBD plasma emission reduction apparatus 700 according to the present invention may further include a voltage supply unit 800 as a component. In the following description, the voltage supply unit 800 is provided separately or together with the DBD plasma emission reduction apparatus 100 without any particular limitation, and a common description will be given.

The DBD plasma emission reduction apparatus 700 according to the present invention includes a first electrode part 710, a second electrode part 720, and a dielectric part 730.

In the present invention, the first electrode unit 710 is formed to extend in one direction, as shown in the figure, and is configured to be electrically connected to the first electrode 801a of the voltage supply unit 800.

The first electrode part 710 may have various shapes, and as an example, it may be formed in a cylindrical shape as shown in the figure. Meanwhile, although not shown, the first electrode unit 710 may include a plurality of sub-electrodes, and these sub-electrodes may be formed to extend in the one direction in which the first electrode unit 710 extends. have. Such a plurality of sub-electrodes may also have various shapes, and as an example, may be formed in a cylindrical shape.

Next, the second electrode part 720 includes a hollow part in which the first electrode part 710 is disposed, and is configured to be electrically connected to the second electrode 801b of the voltage supply part.

The second electrode part 720 may have various shapes including a hollow part, and as an example, may have a cylindrical shape as shown in the figure. The second electrode part 720 is also formed to extend in the one direction.

A dielectric portion 730 is disposed between the first electrode portion 710 and the second electrode portion 720. Dielectric barrier discharge is generated based on the application of voltage and current to the first and

second electrode portions

710 and 720 by the dielectric portion 730.

The dielectric part 730 may be disposed on one surface of the second electrode part 720, and the one surface may be a surface facing the first electrode part 710.

When the voltage is supplied from the voltage supply part 800 to the first electrode part 710 and the second electrode part 720, an electric field is formed in the hollow part by the dielectric part 730.

In the DBD plasma emission reduction apparatus 700 according to the present invention, the voltage supplied from the voltage supply unit 800 is made of an AC voltage.

That is, the voltage supply unit 800 is configured to supply an AC voltage, has a preset period, and is configured to repeatedly supply a positive voltage and a negative voltage to the first and

second electrode units

710 and 720.

In particular, in the present invention, the voltage supply unit 800 is configured to output AC voltages having different voltage levels within the preset period.

Accordingly, AC voltages having different voltage levels are applied to the first and

second electrode units

710 and 720 within the preset period.

Meanwhile, the voltage level supplied from the voltage supply unit 800 may be controlled by the controller 830 (see FIG. 8 ).

That is, the control unit 830 controls the AC voltage supplied from the voltage supply unit so that AC voltages having different voltage levels are applied to the first and

second electrode units

710 and 720 within the preset period. I can.

Accordingly, the electric field of the hollow portion of the second electrode part 720 is varied to have different strengths within the preset period based on the AC voltages having different voltage levels.

The electric field formed in the hollow portion is formed in a radial shape, and when a positive voltage is supplied to the first and

second electrode portions

710 and 720, the first electrode portion 110 to the second electrode portion 120 A radial electric field radiating toward the can be formed.

In contrast, when a negative voltage is applied to the first and

second electrode portions

710 and 720, a radial electric field radiated from the second electrode portion 720 toward the second electrode portion 710 may be formed. have.

Looking in more detail with respect to the voltage supply unit 800, the voltage supply unit 800 according to the present invention includes a variable DC power supply 810, an AC voltage generation unit (Voltage-fed Driver 820), a control unit 830 and Vlink It may be configured to include 840.

The variable DC power supply 810 may be of various types, and the variable DC power supply 810 includes a first DC voltage V1 having a first voltage level and a second voltage level among different voltage levels. 2 It is made to output the DC voltage (V2) repeatedly at a preset period.

In this way, the first and second DC voltages V1 and V2 output from the DC power supply 810 are charged in the Vlink 840 terminal, as shown in FIG. 10A. Then, the DC voltage charged in the Vlink 840 terminal is changed to an AC voltage as shown in FIG. 10B through an AC voltage generator 820.

Meanwhile, the controller 830 controls at least one of the DC power source 810 and the AC voltage generator 820 to control the magnitudes of the first voltage level and the second voltage level.

Furthermore, the controller 830 controls a period and a period in which the first voltage level and the second voltage level are applied.

In the present invention, the DC power supply 810 has a predetermined specific period (Ts, see FIG. 10), and during the first period T1 within the predetermined specific period, the first DC voltage corresponding to the first voltage level ( V1, see (a) of FIG. 10)), and in a second period T2 different from the first period T1 within the preset specific period, a second DC voltage corresponding to the second voltage level (V2, see Fig. 10(a))).

The controller 180 includes a first DC voltage (V1, FIG. 10) corresponding to a first voltage level during a first period (T1) within a predetermined period (Ts, see FIG. 10) of the DC power supply 810. (A))), and in the second period T2 different from the first period T1 within the preset specific period, the second DC voltage V2 corresponding to the second voltage level, FIG. The DC power supply 810 is controlled so that (refer to (a) of 10)) is output.

Further, in the present invention, the AC voltage generator (Voltage-fed Driver 820) has the same period as the preset specific period of the DC power, and the voltage level varies within the preset specific period. Is made to output.

In the present invention, the AC voltage generator (Voltage-fed Driver 820) generates an AC voltage using any one of various methods, for example, a Full Bride method, a Half Bridge method, a Two-Switch Flayback method, AC voltage can be generated by any one of the One-Switch Flyback methods.

According to such a power supply unit 800, as shown in (b) of FIG. 10, in the first and

second electrode units

710 and 720, a first section ( During T1), a first AC voltage V1 having a first voltage level is supplied. In addition, the first and

second electrode units

710 and 720 have a voltage lower than the first voltage level during a second period T2 different from the first period T1 within the preset specific period Ts. A second AC voltage V2 having a second voltage level is supplied.

The first AC voltage is a first pulse wave having the first voltage level during the first period T1, and the second AC voltage has the second voltage level during the second period T2. It may be made of a second pulse wave.

As described above, when AC voltages having different voltage levels are alternately supplied within one period, the DBD plasma emission reduction apparatus according to the present invention includes a second electrode by a positive AC voltage or a negative AC voltage. A phenomenon such as a current flowing in a direction opposite to the current flowing through the unit 720 occurs.

More specifically, based on the supply of the first AC voltage T1 in the first section within the preset specific period Ts, as shown in FIGS. 11A and 11B, the first 1 An electric field (E1, E1') is formed. And, based on the supply of the second AC voltage T2 in the second section, as shown in FIGS. 11A and 11B, second electric fields E2 and E2' are formed. The first and second electric fields E1 and E2, or E1' and E2' are formed to have directions corresponding to each other.

As described above, the AC voltages having different voltage levels are repeatedly supplied alternately within the predetermined specific period, and changes in the electric field of the hollow portion converge in a constant pattern.

As described above, when AC voltages having different voltage levels are repeatedly applied, in the hollow portion of the second electrode unit 720, in some sections of the preset specific period Ts, the first electric field E1 ) Appears, and in some other sections, the first electric field E1 and the second electric field E2 appear together.

Meanwhile, the first electric field (E1, E2, see FIG. 11) is an electric field that appears when the first AC voltage V1 having the first voltage level is continuously applied for the predetermined period Ts. Can be conceptualized.

In addition, the second electric field (E2, E2, see FIG. 11) is a case where the voltage Vext equal to the difference between the first voltage level and the second voltage level is subtracted from the first AC voltage having the first voltage level. (See Fig. 10), it can occur.

That is, as in the present invention, when the AC voltage is supplied at different voltage levels within a predetermined specific period, an additional second electric field separately from the first electric fields E1 and E1' generated when a constant voltage level is supplied. (E2, E2') can be formed.

Meanwhile, the second electrode part 720 has one end and the other end, and the intensity of the second electric field is a region corresponding to the one end and the other end than in the central region of the hollow part provided in the second electrode part ( The openings, 740, 750 may be formed harder.

In this way, the method of supplying the AC voltage by varying the voltage level within a predetermined specific period may have the same effect as additionally supplying current to the DBD plasma smoke reduction device through the current supply unit, as previously described in FIG. 2. have.

Looking at this in more detail, as shown in (a) of Figure 9, the additional current source (Iext), the voltage supply (V), and the DBD plasma exhaust reducing device 700, shown in Figure 9 (b) It can be represented as an equivalent circuit.

A direction in which current flows through the second electrode unit 720 by being supplied from the additional current source Iext forming the second electric field is opposite to the direction in which current flows through the second electrode unit 720 by the voltage supply unit. This is to obtain an additional second electric field radiated in the same direction as the first electric field.

Referring to (b) of FIG. 9, when current is supplied through the additional current source Iext, the current flowing through the DBD plasma soot reduction device 700 is a current minus Iext. Therefore, as a result, as shown in (c) of FIG. 9, the voltage supplied to the DBD plasma soot reduction device 700 is Vext (Iext*R (DBD plasma soot reduction device 700) from the voltage supply unit V It can be summarized by subtracting the resistance corresponding to ))).

Therefore, as shown in (b) of FIG. 10, in the second period T2 of the predetermined specific period Ts, the second AC voltage V2 corresponding to the second voltage level is applied, as a result. As an additional current source, an AC current may be additionally supplied to the DBD plasma smoke reduction apparatus according to the present invention.

Therefore, as shown in (a) of FIG. 11, when a positive voltage is applied from the voltage supply unit 800, a radial first electric field E1 and a second electric field E2 are formed in the xy plane. . And, as shown in (b) of FIG. 11, when a negative voltage is applied from the voltage supply unit 800, in the xy plane, the radial first electric field E1' and the second electric field E2' are Is formed.

As described above, in the DBD plasma smoke reduction apparatus according to the present invention, by repeatedly supplying a voltage lower than a predetermined level of voltage required by the DBD plasma smoke reduction apparatus in a specific section, power consumption is reduced and an additional electric field is formed. , The emission reduction efficiency can be improved.

As described above, the DBD plasma reduction apparatus according to the present invention can increase the soot reduction efficiency by increasing the strength of the electric field by varying the voltage level. The DBD plasma reduction apparatus according to the present invention described above can be applied to transportation means such as vehicles and ships, and further, can be applied to various industrial fields such as air purifiers and water quality improvement apparatuses.

Further, according to the DBD plasma smoke reduction apparatus and a driving method thereof according to the present invention, an electric field capable of increasing the smoke reduction efficiency can be additionally formed by supplying additional current to the electrode.

Further, according to the DBD plasma soot reduction apparatus and the driving method thereof according to the present invention, by repeatedly changing the supplied voltage level, the intensity of the electric field can be varied to increase the soot reduction efficiency. In addition, since the voltage level supplied as described above is repeatedly lowered, it is possible to reduce power consumption for driving the DBD plasma emission reduction apparatus. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims

In the DBD plasma air purifier electrically connected to a voltage supply unit supplying an AC voltage and a current supply unit supplying current,

A first electrode part electrically connected to the first electrode of the voltage supply part;

A second electrode portion having a hollow portion in which the first electrode portion is disposed and electrically connected to a second electrode of the voltage supply portion; And

Based on the AC voltage being supplied to the first electrode part and the second electrode part, between the first electrode part and the second electrode part so that a first electric field having a first direction is formed in the hollow part. A dielectric portion disposed; Including,

The second electrode part extends in one direction and has one end and the other end,

The hollow part has an opening corresponding to the one end and the other end of the second electrode part,

The first electrode part is disposed to extend along the one direction in the hollow part,

A magnetic field is generated in the hollow portion by a current supplied from the current supply unit, and a second electric field different from the first electric field is formed.
The method of claim 1,

DBD plasma air purifier, characterized in that the magnetic field is formed in a clockwise or counterclockwise direction.
The method of claim 2,

The second electric field is directed from the first electrode to the second electrode when the counterclockwise magnetic field is formed, and from the second electrode to the first electrode when the clockwise magnetic field is formed. DBD plasma air purifier, characterized in that facing.
The method of claim 1,

In the first electrode part and the second electrode part,

A DBD plasma air purifier, characterized in that, by the current supplied from the current supply unit, a current having a movement direction of charges opposite to a movement direction of charges formed by the AC voltage is formed with a specific period.
The method of claim 4,

In the case where a current having a moving direction of charges opposite to a moving direction of charges formed by the AC voltage is formed in the second electrode portion,

A DBD plasma air purifier, characterized in that the directionality of the second electric field corresponds to the first directionality of the first electric field.
In the DBD plasma air purifier electrically connected to a voltage supply unit supplying an AC voltage having a preset period,

A first electrode part electrically connected to the first electrode of the voltage supply part;

A second electrode portion having a hollow portion in which the first electrode portion is disposed and electrically connected to a second electrode of the voltage supply portion;

A dielectric portion disposed between the first electrode portion and the second electrode portion to form an electric field in the hollow portion based on the AC voltage being supplied to the first electrode portion and the second electrode portion; And

And a control unit for controlling the AC voltage supplied from the voltage supply unit so that AC voltages having different voltage levels are applied to the first and second electrode units within the preset period,

The second electrode part extends in one direction and has one end and the other end,

The hollow part has an opening corresponding to the one end and the other end of the second electrode part,

The first electrode part is disposed to extend along the one direction in the hollow part,

The electric field of the hollow part is varied to have different strengths within the preset period based on the AC voltage having different voltage levels.
The method of claim 6,

The voltage supply unit,

A variable DC power supply that repeatedly outputs a first DC voltage having a first voltage level and a second DC voltage having a second voltage level;

Vlink to which the first and second DC voltages are charged; And

DBD plasma air purifier comprising an AC voltage generator for changing the DC voltage charged in the Vlink into an AC voltage.
The method of claim 7,

The voltage supply unit controls at least one of the variable DC power supply and the AC voltage generation unit to control the magnitudes of the first voltage level and the second voltage level.
The method of claim 6,

A first AC voltage having a first voltage level is supplied to the first and second electrode units during a first period within the preset period,

Characterized in that a second AC voltage having a second voltage level lower than the first voltage level is supplied to the first and second electrode units during a second period different from the first period within the preset period. DBD plasma air purifier.
The method of claim 9,

In the hollow part,

Based on the first AC voltage being supplied, a first electric field is formed,

DBD plasma air purifier, characterized in that based on the supply of the second AC voltage, a second electric field having a different strength than the first electric field is formed.
In the DBD plasma exhaust emission reduction device electrically connected to a voltage supply unit for supplying an AC voltage and a current supply unit for supplying current,

A first electrode part electrically connected to the first electrode of the voltage supply part;

A second electrode portion having a hollow portion in which the first electrode portion is disposed and electrically connected to a second electrode of the voltage supply portion; And

Based on the AC voltage being supplied to the first electrode part and the second electrode part, between the first electrode part and the second electrode part so that a first electric field having a first direction is formed in the hollow part. A dielectric portion disposed; Including,

The second electrode part extends in one direction and has one end and the other end,

The hollow part has an opening corresponding to the one end and the other end of the second electrode part,

The first electrode part is disposed to extend along the one direction in the hollow part,

In the hollow portion, a second electric field different from the first electric field is formed by the current supplied from the current supply unit,

DBD plasma exhaust emission reduction apparatus, characterized in that the intensity of the second electric field formed by the current supply is formed in the opening than in the central region of the hollow portion.
The method of claim 11,

In the first electrode part and the second electrode part,

By the current supplied from the current supply unit, a current having a movement direction of charges opposite to a movement direction of charges formed by the AC voltage is formed with a specific period.
The method of claim 12,

In the case where a current having a moving direction of charges opposite to a moving direction of charges formed by the AC voltage is formed in the second electrode portion,

The directionality of the second electric field corresponds to the first directionality of the first electric field.
The method of claim 13,

The current supplied from the current supply unit is a direct current,

The second electric field having a directionality corresponding to the first directionality,

DBD plasma soot, characterized in that it is formed only in any one of the cases when a positive voltage is applied to the first electrode and the second electrode or a negative voltage is applied to the first and second electrodes Abatement device.
In the DBD plasma smoke reduction device electrically connected to a voltage supply unit supplying an AC voltage having a preset period,

A first electrode part electrically connected to the first electrode of the voltage supply part;

A second electrode portion having a hollow portion in which the first electrode portion is disposed and electrically connected to a second electrode of the voltage supply portion;

A dielectric portion disposed between the first electrode portion and the second electrode portion to form an electric field in the hollow portion based on the AC voltage being supplied to the first electrode portion and the second electrode portion; And

And a control unit for controlling the AC voltage supplied from the voltage supply unit so that AC voltages having different voltage levels are applied to the first and second electrode units within the preset period,

The second electrode part extends in one direction and has one end and the other end,

The hollow part has an opening corresponding to the one end and the other end of the second electrode part,

The first electrode part is disposed to extend along the one direction in the hollow part,

The electric field of the hollow portion is varied to have different strengths within the preset period based on the AC voltages having different voltage levels,

The electric field of the hollow portion is formed stronger in the opening than in the central region of the hollow portion, DBD plasma exhaust emission reduction apparatus.
The method of claim 15,

A first AC voltage having a first voltage level is supplied to the first and second electrode units during a first period within the preset period,

Characterized in that a second AC voltage having a second voltage level lower than the first voltage level is supplied to the first and second electrode units during a second period different from the first period within the preset period. DBD plasma smoke reduction device.
The method of claim 16,

In the hollow part,

Based on the first AC voltage being supplied, a first electric field is formed,

Based on the supply of the second AC voltage, a second electric field having a strength different from that of the first electric field is formed.
The method of claim 17,

DBD plasma exhaust emission reduction apparatus, characterized in that the first and second electric fields have directions corresponding to each other.
The method of claim 16,

The AC voltage is,

And a second pulse wave having the first voltage level during the first period and a second pulse wave having the second voltage level during the second period.
The method of claim 15,

The alternating voltages having different voltage levels are repeatedly supplied alternately,

DBD plasma exhaust emission reduction apparatus, characterized in that the change in the electric field of the hollow portion converges in a certain pattern.