KR100838408B1 - Plasma reactor - Google Patents

Abstract

The present invention relates to a plasma reactor, comprising: a plasma reactor for forming plasma by discharge, the plasma reactor comprising: a first non-conductive dielectric plate for surface discharge; A discharge electrode attached to a front surface of the first dielectric plate and formed in a plane shape with a predetermined occupied area on the front surface of the first dielectric plate; And a dielectric electrode attached to a rear surface of the first dielectric plate, the dielectric electrode being formed to have a predetermined occupation area that does not overlap with the area occupied by the discharge electrode in a projected manner. Characterized in that it comprises a.

Plasma, Air Purifier, Exhaust Gas Purification, DPF Regeneration

Description

Plasma Reactor {PLASMA REACTOR}

Figure 1a is a diagram showing one embodiment of the overall plasma reactor to which the present invention is applied.

1b shows another embodiment of an overall plasma reactor to which the present invention is applied.

2 and 3 show a plasma reactor according to a first embodiment of the present invention.

4 and 5 show a plasma reactor according to a second embodiment of the present invention.

6 and 7 show a plasma reactor according to a third embodiment of the present invention.

The present invention relates to a plasma reactor, which is used in an indoor air purifier to generate anions beneficial to the human body and to remove air pollution through a plasma reaction, or to be used in an exhaust gas treatment system to directly modify some of the harmful exhaust gases into harmless substances. Or a plasma reactor capable of regenerating a DPF device by reforming with ozone and nitrogen dioxide.

Plasma, which is being actively researched recently, refers to a gas state in which a part of gas is ionized by a fourth material, which is not solid, liquid, or gas. In other words, such a plasma is regarded as a region of gas that passes and emits electricity affected by an external electromagnetic field. Therefore, such an ionized gas plasma can be generated mainly in a high energy state.

Typically, a method of easily generating plasma is a method using electric discharge. That is, when a discharge occurs between the two electrodes, the plasma can be artificially generated on the basis of ionizing a mass of gas present in the surroundings by an electric field formed around the electrodes.

At this time, the method of generating a plasma by using an electrical discharge can be largely divided into surface discharge (volume discharge) and volume discharge (volume discharge).

In the surface discharge, in which an insulator is inserted between two electrodes, two electrodes exist on both sides of the insulator, and a reaction occurs due to a discharge between the two electrodes.

In this case, since the discharge is generated through the insulator, a discharge occurs in the insulator itself, unlike a volume discharge, and an electric field is formed around the electrode, thereby allowing ionization of gases passing through the electrode.

However, in reality, the plasma reactor using the surface discharge has a lot of problems in power consumption because the two electrodes receiving the electric power is made in a plate shape, and thus the electric discharge amount is not sufficient, and thus requires a larger power. It is low and difficult to miniaturize.

In addition, such a conventional plasma reactor is rarely utilized for indoor air purification to remove contamination indoors, especially vehicle interiors because the generation of less anions beneficial to the human body and rather harmful ozone is generated.

The present invention has been made to solve the above problems, its purpose is to be used in indoor air cleaners to prevent the generation of ozone and increase the production of negative ions beneficial to the human body, as well as to generate positive and negative ions at the same time indoor polluted air It is to provide a plasma reactor that can increase the deodorization, removal and sterilization effect of the.

In addition, the present invention provides a plasma reactor capable of regenerating a DPF device by directly modifying a part of harmful exhaust gas into a harmless substance or by modifying it with ozone and nitrogen dioxide having excellent reactivity.

A plasma reactor according to an embodiment of the present invention for achieving the above object, the plasma reactor comprising: a non-conductive first dielectric plate for surface discharge; A discharge electrode attached to a front surface of the first dielectric plate and formed in a plane shape with a predetermined occupied area on the front surface of the first dielectric plate; And a dielectric electrode attached to a rear surface of the first dielectric plate, the dielectric electrode being formed to have a predetermined occupation area that does not overlap with the area occupied by the discharge electrode in a projected manner. Characterized in that it comprises a.

Preferably, the discharge electrodes are formed in a meandering shape, and the induction electrodes are integrally connected by connecting a plurality of plate-like plate electrode elements having a size and a shape inserted into a plurality of space portions partitioned by the meandering shape of the discharge electrode. Characterized in that it is provided with.

More preferably, the discharge electrode is characterized in that provided with at least one sharp protrusion of the horn shape.

More preferably, the discharge electrode and the dielectric electrode are formed of a finger-shaped electrode on the surface having a plurality of finger-shaped protrusions protruding, the finger-shaped protrusions of the discharge electrode and the dielectric electrode with the first dielectric plate therebetween. Each of the protruding electrode faces on both sides is arranged alternately without overlapping.

More preferably, the finger-shaped protrusion of the discharge electrode is characterized in that at least one joint portion having a plurality of radially extending projections is provided.

More preferably, the first dielectric plate has a predetermined pore penetrating at one side thereof, and the power supply at the end of the discharge electrode extends to the rear surface of the first dielectric plate through the pores of the first dielectric plate to receive a high voltage. It is characterized by.

More preferably, a second dielectric plate attached to the dielectric electrode and having two pores penetrating to both sides thereof further comprises a terminal power source of the discharge electrode extending through the first dielectric plate. It extends through the one side void of the dielectric plate to the back side and is exposed as a power supply portion, and the terminal power supply portion of the dielectric electrode extends through the other side pores of the second dielectric plate to the back side and is exposed as a power supply portion, 2 is characterized by receiving a high voltage through each power supply exposed on the back of the dielectric plate.

More preferably, the power applying unit exposed on the back of the second dielectric plate is provided as a junction terminal for connection with the power line.

More preferably, the planar heating plate attached to the second dielectric plate, and preheating the reactor through a DC power supply during the initial operation of the reactor; characterized in that it further comprises.

More preferably, a protective coating film is attached to the front surface of the first dielectric plate to which the discharge electrode is attached.

More preferably, the discharge electrode and the dielectric electrode is made of molybdenum (Mo) or tungsten (W) material, characterized in that the plating treatment with nickel (Ni).

More preferably, the first dielectric plate is made of alumina.

More preferably, the coating film is formed of any one material of silicon oxide (SiO ₂ ), titanium oxide (TiO ₂ ) and alumina (aluminum oxide).

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Figure 1a is a diagram showing the overall plasma reactor to which the present invention is applied.

As shown in the figure, in the plasma reactor to which the present invention is applied, the discharge electrode 10 and the induction electrode 20 are attached to the front and rear surfaces of the first dielectric plate 30, respectively. Is attached to the second dielectric plate 40.

That is, a flat plate-shaped discharge electrode 10 is patterned and attached to a front surface of the first dielectric plate 30, and a flat plate-shaped induction electrode 20 is attached to a rear surface of the first dielectric plate 30. This is patterned and attached.

Herein, the electrodes 10 and 20 are made of molybdenum (Mo) or tungsten (W), and furthermore, the deposition of foreign substances that occur when the electrode is used for a long time, and thus the decrease of anion amount and increase of ozone amount. In order to prevent this, it is preferable to plate nickel (Ni) on the electrodes 10 and 20 made of molybdenum (Mo) or tungsten (W).

In addition, the dielectric plates 30 and 40 may be made of alumina having excellent electrical characteristics and low insulation loss.

Here, one perforated gap 31 is formed at one end of the first dielectric plate 30, and two voids 41 are formed at both ends of the second dielectric plate 40, thereby discharging the discharge. It provides a passage for connecting the power source of the electrode 10 and the induction electrode 20.

In more detail, the discharge electrode 10 receives an external power source for plasma discharge through the power supply unit 11, which is the end thereof, which is connected to one side of the first dielectric plate 30. It extends to the back side of the first dielectric plate 30 through the formed one gap 31 is exposed on the back of the first dielectric plate 30.

In addition, the power supply unit 11 of the discharge electrode 10 continuously penetrates and extends even through the gap 41 on one side of the second dielectric plate 40, and finally the back surface of the second dielectric plate 40. By exposing the phase, the discharge electrode side power applying unit 12 for connection with the external high voltage supply unit 60 is formed on the rear surface of the second dielectric plate 40.

On the other hand, the induction electrode 10 also receives an external power source for plasma discharge through the power supply unit 21 which is the end thereof, the power supply unit 21 is the other one formed on the other side of the second dielectric plate 40 An induction electrode side power supply unit for connection with an external high voltage supply unit 60 is extended to the rear side of the second dielectric plate 40 through the gap 31 and exposed on the rear side of the second dielectric plate 40. 22 is formed on the back side of the second dielectric plate 40.

Therefore, since the power supply unit 22 of the discharge electrode 10 and the induction electrode 20 is exposed to the same downward direction when viewed in the entire plasma reactor, discharge electrodes and induction electrodes are simply provided on both sides of the dielectric plate, respectively. As in the conventional art, there is no need to secure a separate long and curved extension power cable for connecting to the discharge electrode or the induction electrode or a separate additional installation space for the extension power cable.

Here, the plasma reactor structure of the present invention may be configured without the second dielectric plate 40, and by additionally mounting the second dielectric plate 40, the plasma reactor structure serves as a reliable mounting support for installation in a small space. Of course, both electrodes 10 and 20 are extended through the gaps 41 on both sides of the second dielectric plate 40 to expose and protect the dielectric electrode 20. It is possible to provide a direct soldering surface at the time of connection.

In addition, a coating film 50 is attached to the front surface of the first dielectric plate 30, that is, the surface on which the discharge electrode 10 is attached, so that the discharge electrode 10 and the first dielectric plate 30 are exposed. It protects the cotton.

The coating film 50 is formed using a silicon oxide (SiO ₂ ) or titanium oxide (TiO ₂ ) material or alumina (aluminum oxide) material, the coating film 50 is a high temperature generated during discharge This prevents the electrode portion or the dielectric plate from being damaged, thereby improving the purification reliability of the product and further suppressing ozone generation.

Meanwhile, FIG. 1B shows another embodiment of the overall plasma reactor to which this invention is applied.

Referring to the figure, a planar heating plate 70 is additionally attached to the rear surface of the second dielectric plate 40.

In general, the initial temperature of the reactor is low, it is difficult to achieve a normal discharge due to the low temperature of the reactor itself, it is true that this phenomenon continues until the temperature rises to a certain temperature.

In addition, when the ambient humidity is high when the plasma reactor is installed, many restrictions are placed on the generation of ions. In particular, in high humidity environments, ions are not generated at all, or they are weak even if they are generated. In addition, the efficiency of the reaction is very low because the reaction rate is extremely low due to the small amount of direct contact with the gas to be reacted (indoor polluted air or exhaust gas). .

However, since the planar heating plate 70 is provided with a heating element (for example, a heating wire) that generates heat according to a separate DC power supply therein, by pre-heating the reactor itself by receiving DC power during initial operation at the bottom of the reactor. By increasing the temperature above a certain temperature, even in the initial stage of operation of the reactor, a normal discharge occurs, thereby stably activating the plasma reaction.

In addition, by increasing the temperature of the reactor it is possible to lower the relative humidity (surface of the reactor) relative humidity to increase the overall ion generation amount and the reactivity of the reactor.

At this time, the planar heating plate 70 is driven by receiving a separate DC power supply, the planar heating plate 70 is provided with two connection terminals for power input from one side or connection for power input to each side It is possible to form the terminal is provided.

Now, the front and rear electrodes 10 and 20 of the plasma reactor having the above-described configuration will be described in detail.

2 and 3 illustrate a discharge electrode 10 and an induction electrode 20 according to the first embodiment of the present invention.

As shown in the figure, the discharge electrode 10 is attached to form a meandering shape of the electrode of a predetermined width on the front surface of the first dielectric plate (30). The power supply unit 11, which is an end of the meandering discharge electrode 10, is a power supply unit 12 formed on the rear surface of the second dielectric plate 40 through the gap 31 of the first dielectric plate 30. Is extended.

At this time, the meandering discharge electrode 10 is provided with sharp protrusions 13 having a horn shape for increasing the current concentration during discharge.

As the protrusions 13 are provided, electric field concentration occurs between the protrusion 13 of the discharge electrode 10 and the induction electrode 20, and thus, between the induction electrode 20 and the discharge electrode 10. Discharge tends to occur. Therefore, the voltage applied to the induction electrode 20 and the discharge electrode 10 can be lowered, so that the efficiency is improved.

On the other hand, the induction electrode 20 on the back of the first dielectric plate 30 corresponding to the meandering discharge electrode 10 is configured to have a structure that is crossed with the discharge electrode 10 forming the meandering shape. That is, the meandering discharge electrode 10 is formed on the front surface of the first dielectric plate 30 as a meandering shape with a predetermined occupying area, while the dielectric electrode is attached to the rear surface of the first dielectric plate 30. Denoted at 20 is an area occupied by the discharge electrode 10.

In more detail, as shown in FIGS. 2 and 3, a plurality of flat plates having a size and a shape that can be inserted into the plurality of spaces 14 partitioned by the meandering shape of the discharge electrode 10. The induction electrode 20, which is integrally provided by connecting the type electrode elements 23, is provided on the rear surface of the first dielectric plate 30.

At this time, the planar electrode elements 23 of the meandering discharge electrode 10 and the induction electrode 20 are attached to the front and rear surfaces of the first dielectric plate 30 so as not to overlap each other.

In practice, the two electrodes 10 and 20 for plasma discharge have an equivalent circuit such as a parallel connection of a capacitor and a variable resistor.

Therefore, since the major element of the actual plasma generation is the amount of electric discharge, to increase this, the capacitance in the equivalent circuit of the reactor must be reduced, and as a result, the reactor electrode having a low capacitance can be easily discharged even at a relatively small high voltage.

In other words, when the actual discharge begins, the plasma reactor acts as an equivalent circuit such as a parallel connection circuit between the capacitor and the resistor. Therefore, in order to increase the reaction efficiency, the minimum capacitance required for the reaction to occur is minimized by minimizing the capacitance tendency of the reactor itself. It is desirable to keep the bay. Therefore, this object is achieved by minimizing the overlapping area between the induction electrode 20 and the discharge electrode 10 positioned on both sides with a dielectric plate therebetween.

Accordingly, when the discharge electrodes 10 and the induction electrodes 20 on both sides have a staggered arrangement with the first dielectric plate 30 interposed therebetween, the capacitance in the reactor is remarkably reduced, thereby relatively small high voltage drawing Discharge can easily occur even at the time, it is possible to lower the power consumption for the discharge.

That is, structurally, each of the electrodes 10 and 20 has a meandering shape and is provided with a plurality of flat plate electrode elements 23 to increase the occupied area during discharge for plasma generation, and at the same time, the electrodes 10 on both sides. , 20) is a staggered structure without overlapping each other, thereby reducing the capacitance, thereby lowering the power consumption with an increase in the discharge amount.

At this time, each of the power supply units 12 and 22 connected to the discharge electrode 10 and the induction electrode 20 receives a high voltage AC pulse, which is an AC type pulse, through the high voltage supply unit 60 for plasma generation. do.

Next, the discharge electrode 10 and the induction electrode 20 according to the second embodiment of the present invention will be described with reference to FIGS. 4 and 5.

As shown in the figure, the discharge electrode 10 and the induction electrode 20 are composed of a finger electrode having a plurality of finger-shaped protrusions on the front and back of the first dielectric plate 30.

In this case, the discharge electrode 10 and the induction electrode 20 is configured to have a structure in which the finger-shaped protrusions on both sides 10 and 20 respectively positioned on the front and rear surfaces thereof are staggered from each other.

That is, the structure of the discharge electrode 10 and the induction electrode 20 is provided with a plurality of finger-shaped protrusions to increase the occupied area during discharge for plasma generation, and at the same time the electrodes 10, 20 on both sides By forming a staggered structure, the capacitance can be reduced, and the power consumption is lowered with the increase of the discharge amount.

4 and 5, the discharge electrode 10 has three finger-shaped protrusions and the induction electrode 20 staggered therefrom has two finger-shaped protrusions (aka, 3-2). Electrode structure) is only one embodiment of the present invention, the principle of the present invention is not limited to this structure having a plurality of finger-like protrusions in the state in which the finger-shaped electrodes (10, 20) of both sides staggered with each other (for example , 4-3 electrode structure, 5-4 electrode structure, and the like.

Next, the discharge electrode 10 and the induction electrode 20 according to the third embodiment of the present invention will be described with reference to FIGS. 6 and 7.

As shown in Figs. 6 and 7, in this embodiment, as in the second embodiment, a joint having a plurality of protrusions extending radially to a corresponding discharge electrode 10 composed of a finger electrode having a plurality of finger-like protrusions. Multiple portions 15 are provided to facilitate the plasma discharge more smoothly.

At this time, each of the joints 15 is shown as having four protrusions, but the present invention is not limited to this, two, three, five, etc. are formed to be provided with a plurality of protrusions Can be.

On the other hand, a plurality of the above-described plasma reactor may be stacked to utilize for purification of in-vehicle exhaust gas. That is, one plasma reactor has a structure in which a plurality of plasma reactors, each of which is capable of generating plasma by itself, are stacked so that oxygen used directly in the vehicle for purification of exhaust gas or contained in the vehicle exhaust gas (O _2). ) And Nitric Oxide (NO) can be introduced to reform DPF (Diesel Particulate Filter) by reforming into ozone (O ₃ ) and nitrogen dioxide (NO ₂ ), which are highly reactive by plasma generation.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited to the drawings.

As described above, in the plasma reactor shown in the present invention, the discharge electrode and the induction electrode on both sides are staggered with each other, so that the capacitance in the reactor is significantly reduced, so that the discharge can easily occur even at a relatively small high voltage inlet. As a result, the power consumption for discharging can be lowered, as well as to suppress the generation of ozone and increase the generation of negative ions, which are beneficial to the human body, and to increase the deodorization, the ability to remove harmful gases, and the sterilization effect by simultaneously generating positive and negative ions. It also works.

In addition, there is an effect that can be used in the exhaust gas treatment apparatus to directly modify a portion of the harmful exhaust gas or to generate ozone and nitrogen dioxide having excellent reactivity, so that it can be used for regeneration of the DPF apparatus.

In addition, by applying a coating film on the front surface, there is an effect of preventing damage to the electrode portion or the dielectric plate due to the high heat generated during discharge, thereby improving the purification reliability of the product.

In addition, there is an effect that can reduce the installation space at the same time to have the optimum mounting properties in a variety of applications, such as for cleaning the indoor air of the vehicle mounted inside the vehicle.

In addition, the additional mounting of the second dielectric plate serves as a reliable mounting support for installation in a small space, as well as both electrodes are extended and exposed through the air gaps on both sides of the second dielectric plate. Protection is also possible, and direct junctions can be provided when connecting to an external power source.

In addition, by additionally installing a planar heating plate, it is possible to apply preheating above a certain temperature to the reactor, thereby keeping the amount of ions generated stably, and enabling stable ion generation even in a high humidity environment, thereby eliminating restrictions on the installation environment. .

Claims (13)

In the plasma reactor for forming a plasma by discharge, A nonconductive first dielectric plate for surface discharge; A discharge electrode attached to a front surface of the first dielectric plate and formed in a plane shape with a predetermined occupied area on the front surface of the first dielectric plate; And A dielectric electrode attached to a rear surface of the first dielectric plate, the dielectric electrode being formed to have a predetermined occupation area that does not overlap with the area occupied by the discharge electrode in a projected manner; Including, The first dielectric plate has a predetermined pore penetrating at one side, the power supply terminal of the end of the discharge electrode is extended to the back of the first dielectric plate through the pores of the first dielectric plate is supplied with a high voltage, And a second dielectric plate attached to the dielectric electrode and having two pores penetrating to both sides. The terminal power supply portion of the discharge electrode extending through the first dielectric plate extends through the one side gap of the second dielectric plate to the back side and is exposed as a power applying portion, and the terminal power supply portion of the dielectric electrode is exposed to the second dielectric plate. Plasma reactor characterized in that the high voltage is supplied through each of the power supply is exposed to the back of the second dielectric plate extending through the other side of the second dielectric plate exposed to the back. The method of claim 1, The discharge electrode is formed in a meandering shape, and the induction electrode is integrally provided by connecting a plurality of plate-shaped plate electrode elements having a size and a shape to be inserted into a plurality of space portions partitioned by the meandering shape of the discharge electrode. Plasma reactor, characterized in that. The method of claim 2, Plasma reactor, characterized in that the discharge electrode is provided with at least one sharp protrusion of the horn shape. The method of claim 1, The discharge electrode and the dielectric electrode are formed of a finger-shaped electrode on a surface having a plurality of finger-shaped protrusions protruding from each other, the finger-shaped protrusions of the discharge electrode and the dielectric electrode are each projecting electrode on both sides with the first dielectric plate therebetween Plasma reactor, characterized in that the sides are arranged alternately without overlapping. The method of claim 4, wherein The finger-shaped protrusion of the discharge electrode is plasma reactor, characterized in that provided with at least one joint portion having a plurality of radially extending projections. delete delete The method of claim 1, And a power applying unit exposed to the rear surface of the second dielectric plate is provided as a junction terminal for connection with a power line. The method of claim 1, And a planar heating plate attached to the second dielectric plate and preheating the reactor through a DC power source during initial operation of the reactor. In the plasma reactor for forming a plasma by discharge, A nonconductive first dielectric plate for surface discharge; A discharge electrode attached to a front surface of the first dielectric plate and formed in a plane shape with a predetermined occupied area on the front surface of the first dielectric plate; And A dielectric electrode attached to a rear surface of the first dielectric plate, the dielectric electrode being formed to have a predetermined occupation area that does not overlap with the area occupied by the discharge electrode in a projected manner; Including, Plasma reactor, characterized in that the protective coating film is attached to the front surface of the first dielectric plate attached to the discharge electrode. The method according to any one of claims 1 to 5, The discharge electrode and the dielectric electrode is made of molybdenum (Mo) or tungsten (W) material and the plasma reactor, characterized in that the plating treatment with nickel (Ni). The method according to any one of claims 1 to 5, The first dielectric plate is a plasma reactor, characterized in that consisting of alumina (aluminum oxide). The method of claim 10, The coating film is a plasma reactor, characterized in that formed of any one material of silicon oxide (SiO ₂ ), titanium oxide (TiO ₂ ) and alumina (aluminum oxide).

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