Device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma

Abstract

The disclosed device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma includes: a chamber, which is a tubular body, through which the gas to be treated, consisting of indoor air, ambient air, or exhaust gas including pollutants, flows, and a ground power source is connected to the chamber; a power supply device, which is arranged outside the chamber to continuously apply a voltage of a certain magnitude set as direct current or alternating current; a emitter, which is a hollow tubular body having a plurality of tips for generating plasma on its outer surface, the emitter is arranged inside the chamber to extend in a direction parallel to the flow of the gas to be treated, and is electrically connected to the power supply device to generate non-thermal plasma; a rod, which electrically connects the emitter to the power supply device and supports the emitter to be arranged at the center inside the chamber; and an insulator, which electrically insulates the rod from the chamber to prevent an arc from occurring between the rod and the chamber.

Description

Technical Field

[0001] The present disclosure relates to an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma, and more particularly, to such an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma, the apparatus having an arc discharge prevention / control structure capable of improving the efficiency of generating non-thermal plasma, and reducing pollutants such as particulate matter or volatile organic compounds (VOCs) contained in the following: air in a factory or a densely populated urban area; indoor air or ambient air in a building, a factory, or an agricultural and livestock facility; exhaust gas discharged from a power plant using fossil fuels such as LNG and coal; and gas discharged from an internal combustion engine. Background Art

[0002] This section provides background technical information related to the present disclosure, which is not necessarily prior art.

[0003] A general apparatus for reducing pollutants by using non-thermal plasma includes a chamber and a emitter as main components. In this case, pollutants refer to pollutants in indoor air or ambient air, or pollutants such as particulate matter in exhaust gas.

[0004] Ambient air, indoor air, or exhaust gas flows into a chamber which is a tubular body, and the emitter is disposed inside the chamber.

[0005] When a high voltage is applied to the emitter, discharge occurs between the chamber and the emitter, and electrons are discharged.

[0006] Electrons discharged at high speed collide with pollutants contained in ambient air, indoor air, or exhaust gas, and the pollutants collided with the electrons are converted into plasma in which electrons, ions, and neutral particles are mixed.

[0007] The high voltage applied to the emitter needs to be applied to the emitter without leakage.

[0008] If the high voltage leaks, the voltage between the emitter and the chamber drops, which may cause a rapid decrease in the efficiency of generating plasma.

[0009] In particular, if arc discharge occurs between the chamber and a rod, in addition to the discharge occurring between the chamber and the emitter, the discharge at the emitter deteriorates, and the rod is used to position and support the emitter inside the chamber, which results in a rapid decrease in the efficiency of generating non-thermal plasma.

[0010] In addition, strong arc discharge can damage the surfaces of the chamber and the rod.

[0011] For this reason, in addition to problems with the chamber and the rod, more serious problems may occur, in which the fatigue level of the power supply device for generating high voltage increases uniformly, and the power supply device cannot operate due to damage or failure.

[0012] In addition, if water vapor or pollutants in ambient air, indoor air, or exhaust gas accumulate on the surface of the insulator that surrounds the outer surface of the rod and prevents current leakage to a predetermined level or higher, in addition to the current that weakly flows along the pollution source and water vapor accumulated on the surface of the insulator and removes the pollution source, arc discharge is induced to the pollution source and water vapor accumulated on the surface of the insulator. This arc discharge also causes the same problems as the arc discharge between the rod and the chamber.

[0013] However, the arc discharge induced to the surface of the insulator has the effect of removing the pollution source and water vapor accumulated on the surface of the insulator, regardless of whether the arc discharge requires a large or small amount of power consumption. The problem with arc discharge is that the amount of electric power consumed by the arc discharge causes a voltage drop in the voltage applied to the emitter. If the voltage applied to the emitter drops to a predetermined level or higher, the efficiency of generating plasma deteriorates, which consequently leads to a deterioration in the efficiency of removing pollution sources in ambient air, indoor air, or exhaust gas.

[0014] Therefore, a structure and device are needed that can prevent and control arc discharge (i.e., prevent intense arc discharge) by using an appropriate method, induce the arc discharge to a low-current weak arc discharge by adjusting the current required for the arc discharge within a predetermined range, maintain the voltage applied to the emitter at a predetermined level or higher to maintain the efficiency of generating plasma at a normal level, and quickly remove the pollution source and water vapor on the surface of the insulator.

[0015] The predetermined level or higher of the voltage is preferably 90% or more of the specially adjusted voltage. Summary of the Invention

[0016] Technical Problem

[0017] The present disclosure relates to a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma.

[0018] The present disclosure relates to a device for reducing pollutants by using non-thermal plasma, the device having an emitter structure that prevents deterioration of the efficiency of generating non-thermal plasma by preventing dense arc discharge with high power consumption and inducing weak arc discharge with low power consumption.

[0019] The present disclosure relates to a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma. The device has a chamber structure that induces weak arc discharges with low power consumption and prevents deterioration of the efficiency of generating non-thermal plasma caused by dense arcs with high power consumption.

[0020] The present disclosure relates to a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma. The device has such a structure and means that induce weak arc discharges with low power consumption and prevent deterioration of the efficiency of generating non-thermal plasma caused by dense arcs with high power consumption.

[0021] Technical solution

[0022] This section provides a general inventive concept of the present disclosure and is not a full disclosure of its entire scope or all of its features.

[0023] One aspect of the present invention provides a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma. The device includes: a chamber configured as a tubular body through which a processing target gas, which is indoor air, ambient air or exhaust gas configured to include pollutants, flows; a power supply device disposed outside the chamber and configured to continuously apply a voltage of a certain magnitude set as direct current or alternating current; a emitter configured as a hollow tubular body having a plurality of tips formed on an outer surface of the hollow tubular body and configured to generate plasma. The emitter is disposed in the chamber, is elongated in a direction parallel to a flow direction of the processing target gas, is electrically connected to the power supply device, and is configured to generate non-thermal plasma; a rod configured to electrically connect the emitter and the power supply device and support the emitter such that the emitter is disposed at a center inside the chamber; and an insulator configured to electrically insulate the rod and the chamber and prevent arc discharge from occurring between the rod and the chamber.

[0024] In a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to one aspect of the present invention, a most desirable ratio between a surface area of the emitter and an area of an inner surface of the chamber corresponding to a length of the emitter may be 1:1.

[0025] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the tip provided on the emitter may have at least one shape selected from the following: a first tip shape having at least one shape selected from a conical shape, a hemispherical shape, an elliptical hemispherical shape, a cylindrical shape, a pyramidal shape, a frustum pyramidal shape, and a prismatic shape; a second tip shape having a shape with a curved surface, wherein a part or all of the lateral surface of the first tip shape includes a circular shape or an elliptical shape; and a third tip shape having a shape in which threads, helical grooves, or serrated teeth are spirally formed from the upper end to the lower end or a part of the lateral surface of each of the first tip and the second tip.

[0026] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the surface of the emitter is coated with carbon nanotubes.

[0027] A device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention may include: a support configured to connect the emitter and the rod; and a cover provided at two opposite ends of the emitter based on the longitudinal direction of the emitter and configured to isolate the interior of the emitter.

[0028] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the emitter may be provided as a plurality of emitters, the plurality of emitters may have different lengths and vertical heights and are sequentially provided in the longitudinal direction of the chamber, and among the plurality of emitters, the emitter having a long length or a small vertical height may be provided on the downstream side based on the flow direction of the processing target gas.

[0029] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the insulator may be provided as a plurality of insulators, and the upstream insulator among the plurality of insulators may be provided as a pseudo-insulator not applied with voltage, and it is possible to prevent the processing target gas from directly contacting the downstream insulator, so that a pollution source and water vapor contained in the processing target gas are prevented from accumulating on the surface of the downstream insulator.

[0030] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the emitters may be provided as a plurality of emitters, each of the plurality of emitters may be configured as a tubular body similar to the chamber and have different diameters or sizes, the plurality of emitters may be arranged on concentric circles or at the same center point, while overlapping each other in the radial direction of the chamber, and the plurality of emitters may be arranged at the same interval.

[0031] A device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention may include: an air curtain unit, the air curtain unit being configured to have a tubular body of various shapes including at least a thin circular tube, the air curtain unit being configured to connect the outside and the inside of the chamber, being provided on the upstream side of the insulator based on the flow direction of the target gas to be treated, and being configured to eject compressed air from the outside of the chamber toward at least any one of the insulator, the upstream side of the insulator, or the front surface portion of the insulator.

[0032] A device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention may include a nitrogen oxide reduction metal catalyst device, the nitrogen oxide reduction metal catalyst device being provided on the downstream side of the emitter based on the flow direction of the target gas to be treated and being configured to contain one or more materials selected from the group consisting of vanadium, zeolite, and metal catalyst, wherein the nitrogen oxide reduction metal catalyst device may reduce nitrogen oxides in the target gas to be treated by promoting the reaction of nitrogen oxides contained in the target gas to be treated.

[0033] A device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention may include an ozone removal metal catalyst device, the ozone removal metal catalyst device being provided on the downstream side of the emitter based on the flow direction of the target gas to be treated and being configured to contain at least one or more materials selected from the group consisting of manganese oxide (MnOx) catalyst, titanium dioxide (TiO2) catalyst, or zeolite catalyst and other metal catalysts, wherein the ozone removal metal catalyst device may reduce ozone remaining in the target gas to be treated.

[0034] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the nitrogen oxide reduction metal catalyst device may be installed together with the air curtain unit, and nitrogen and oxygen contained in the compressed air ejected from the air curtain unit may be used to promote the reaction of the metal catalyst of the nitrogen oxide pollutant reduction device to reduce nitrogen oxides contained in the target gas to be treated.

[0035] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the rod may include: a vertical rod extending from one side of the inner surface of the chamber to the center of the chamber; and a horizontal rod extending along the center of the chamber and having a distal end connected to the emitter. The insulator may surround the vertical rod from one side of the inner surface of the chamber, and the insulator may have a length such that the vertical rod is exposed by a preset height H from the horizontal rod, and the preset height H is equal to or less than 1 / 2 of the vertical height h of the emitter.

[0036] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the chamber may include an anti-arc discharge chamber, which is a space formed to protrude outward from one side of the inner surface of the chamber. The rod may include: a vertical rod extending from one side of the inner surface of the anti-arc discharge chamber to the center of the chamber; and a horizontal rod extending along the center of the chamber and having a distal end connected to the emitter. And the shortest distance between the horizontal rod and the inner surface of the anti-arc discharge chamber may be equal to or greater than the radius of the chamber, so that the anti-arc discharge chamber can prevent arc discharge between the anti-arc discharge chamber and the horizontal rod.

[0037] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the chamber may have a preset length b from the inner surface of the chamber to the center point. The length a of the insulator may be equal to or longer than the preset length b, and the horizontal length c from the edge where the anti-arc discharge chamber meets the chamber to the vertical rod may be equal to or shorter than the preset length of the horizontal rod.

[0038] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, a cross-section of the anti-arc discharge chamber based on the flow direction of the target gas to be treated may have a shape selected from shapes partially defining a circular shape, an elliptical shape, and a polygonal shape.

[0039] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the anti-arc discharge chamber may be installed in an annular shape along the perimeter of the chamber.

[0040] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the emitter may be positioned on the downstream side of the insulator based on the flow direction of the target gas to be treated, to prevent the target gas to be treated from directly colliding with a surface of the insulator located on one side of the emitter, and to prevent accumulation of a pollution source and water vapor contained in the target gas to be treated.

[0041] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the insulator may further include an insulator cleaning device configured to prevent accumulation of a pollution source and water vapor on a surface of the insulator or to remove the pollution source and water vapor accumulated on the surface of the insulator.

[0042] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the insulator may be provided as a plurality of insulators, and the chamber may have a certain length such that at least one insulator is installed at the rear side of the most downstream insulator, to prevent vortex or backflow of the target gas to be treated, and to prevent accumulation of a pollution source in the target gas on the plurality of insulators, the vortex or backflow occurring when the chamber located at the rear side of the plurality of insulators narrows or bends.

[0043] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the rod may include: a vertical rod extending from one side of the inner surface of the chamber to the center of the chamber; and a horizontal rod extending along the center of the chamber and having a distal end coupled to the emitter. The insulator may surround the entire portion from one side of the inner surface of the chamber to the end of the vertical rod. And the device may include at least any one of the following: a lower insulator outer sheath made of a metal conductor including stainless steel and copper and configured to surround the outer surface of the insulator with a length equal to or shorter than a preset height H from the position of the horizontal rod; and an upper insulator outer sheath made of a metal conductor including stainless steel and copper and configured to surround the outer surface of the insulator with a length equal to or shorter than a preset height from one side of the inner surface of the chamber.

[0044] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, in the case of including only one of the upper insulator outer sheath and the lower insulator outer sheath, the length of one of the upper insulator outer sheath and the lower insulator outer sheath may be equal to or less than 1 / 2 of the vertical height h of the emitter. And in the case of including both the upper insulator outer sheath and the lower insulator outer sheath, the sum of the length of the upper insulator outer sheath and the length of the lower insulator outer sheath may be equal to or less than 1 / 2 of the vertical height h of the emitter.

[0045] A device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention may include a heat generating device configured to surround the outer surface of the chamber and configured to generate heat for the insulator or included in the device. The heat generating device may prevent arc discharge caused by condensation of water vapor contained in the process target gas at the time point of starting to generate the process target gas.

[0046] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the emitter may be provided at the front side and the rear side of the vertical rod based on the flow direction of the process target gas.

[0047] In an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the upper and lower ends of the insulator may be made of two or more different electrically insulating materials, or the outer and inner portions of the insulator may be made of two or more different electrically insulating materials.

[0048] In an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, when direct current is supplied to the power supply device, the direct current may be supplied after the polarity of the direct current is reversed according to a preset time period to separate the pollution sources contained in the target gas to be treated and adsorbed in the chamber.

[0049] An apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention may include: a bundle of unit chambers disposed in a flow path of the target gas to be treated in the chamber and configured to divide an entire vertical cross-section into a plurality of cross-sections in the flow direction of the target gas to be treated, wherein the plurality of unit chambers constituting the bundle of unit chambers have cross-sections of the same shape, wherein the emitter is disposed at the center inside each of the plurality of unit chambers, wherein the shape of the outer surface of the emitter is similar to the inner surface of the unit chamber, and wherein the emitter is always positioned at a predetermined position within the shortest distance from any position on the outer surface of the emitter to the inner surface of the unit chamber.

[0050] In an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the emitter may be provided as a pair of emitters disposed at the front and rear sides of the vertical rod based on the flow direction of the target gas to be treated.

[0051] In a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to an aspect of the present invention, the vertical rod or the horizontal rod may be divided into two or more vertical rods or horizontal rods in a longitudinal direction, and the device may further include an insulating member disposed to be inserted into the separated vertical rod or horizontal rod such that the separated vertical rod or horizontal rod is connected in the longitudinal direction. When a voltage higher than a preset limit voltage is applied between the separated vertical rod or horizontal rod, the insulating member may allow current to flow smoothly between the separated vertical rod or horizontal rod, and when a voltage equal to or lower than the preset limit voltage is applied between the separated vertical rod or horizontal rod, the insulating member may block the flow of current between the separated vertical rod or horizontal rod.

[0052] Advantageous Effects

[0053] According to the present disclosure, the emitter is configured as a tubular body, so that the emitter can be manufactured to be lightweight. In addition, the plasma generation surface area can be increased, thereby improving the efficiency of generating plasma.

[0054] According to the present disclosure, the tubular body type emitter can be used to prevent deterioration of the efficiency of generating plasma caused by arc discharge.

[0055] According to the present disclosure, a pseudo-insulator is installed at the foremost side of the insulator, which enables prevention of deterioration of the efficiency of generating plasma caused by arc discharge.

[0056] According to the present disclosure, a plurality of chambers are installed in the tube, which enables prevention of deterioration of the efficiency of generating plasma caused by arc discharge.

[0057] According to the present disclosure, an air curtain structure can be adopted to prevent arc discharge on the surface of the insulator, thereby preventing deterioration of the efficiency of generating plasma caused by arc discharge, and improving the efficiency of reducing nitrogen oxides (NOx) by using the ejected air and catalyst.

[0058] According to the present disclosure, an anti-arc discharge chamber protruding outwardly from the portion where the insulator is provided to the outside of the chamber can be adopted, such that the distance between the rod where arc discharge mainly occurs and the chamber is relatively longer than the distance between the chamber and the tubular body type emitter, which enables prevention of arc discharge between them and improves the effect of preventing arc discharge.

[0059] According to the present disclosure, an insulator cleaning device can be adopted to remove pollutants or water vapor on the surface of the insulator, which enables prevention of arc discharge caused by pollutants or water vapor and improves the efficiency of generating plasma. Description of the Drawings

[0060] Figure 1 is a diagram for explaining an embodiment of a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present disclosure.

[0061] Figure 2 is Figure 1 an enlarged view of region A in

[0062] Figure 3 is a diagram for explaining various embodiments of the tip shape.

[0063] Figure 4 is a diagram for explaining various embodiments of the cover and the support member.

[0064] Figure 5 is a diagram showing an embodiment of a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present disclosure, the device having a plurality of emitters arranged in sequence.

[0065] Figure 6 is a diagram showing an embodiment of a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present disclosure, the device having a plurality of emitters arranged on concentric circles.

[0066] Figure 7 is a diagram showing an embodiment of a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present disclosure, the device having an air curtain portion.

[0067] Figure 8 is a diagram of a cross-section based on the flow direction of the target gas to be treated, showing another embodiment of a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present disclosure.

[0068] Figure 9 is a diagram of a cross-section based on the flow direction of the target gas to be treated, showing various other embodiments of a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present disclosure.

[0069] Figure 10 is a diagram showing an embodiment of a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present disclosure, the device having a reverse emitter.

[0070] Figures 11 to 20FIG. is a diagram showing various embodiments of an insulator cleaning device for a device that reduces pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma, the device having a reverse emitter.

[0071] Figure 21 and Figure 22 FIG. is a diagram showing various embodiments of a device that reduces pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma, Figure 10 in which reverse emitters are arranged in sequence in the device.

[0072] Figure 23 FIG. is a diagram showing an embodiment of a device that reduces pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the device having an upper outer sheath of the emitter and a lower outer sheath of the emitter.

[0073] Figure 24 FIG. is a diagram showing an embodiment of a device that reduces pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the device having a water vapor removal device.

[0074] Figure 25 FIG. is a diagram showing an embodiment of a device that reduces pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the device having a bidirectional emitter.

[0075] Figure 26 FIG. is a diagram showing various embodiments of a device that reduces pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the device having various chambers.

[0076] Figures 27 to 36 FIG. is a diagram showing an embodiment of a device that reduces pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, in which the interior of the chamber is separated in the device.

[0077] Figures 37 to 39 FIG. is a diagram for explaining an insulating member. DETAILED DESCRIPTION

[0078] Hereinafter, embodiments of a device that reduces pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure will be described in detail with reference to the accompanying drawings.

[0079] However, it should be noted that the inherent technical spirit of the present disclosure is not limited by the following exemplary embodiments, and those skilled in the art can easily substitute or change the following exemplary embodiments based on the inherent technical spirit of the present disclosure.

[0080] In addition, the terms used herein are chosen for ease of description and should be interpreted appropriately to conform to the technical spirit of the present disclosure, rather than being limited to the dictionary meanings when identifying the inherent technical spirit of the present disclosure.

[0081] Figure 1 is a diagram for explaining an embodiment of an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas according to the present disclosure by using non-thermal plasma, and Figure 2 is Figure 1 an enlarged view of region A in

[0082] Figure 1 shows a state in which a part of the chamber 100 is cut away and removed.

[0083] As visible in Figure 1 and Figure 2 an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas according to the present embodiment by using non-thermal plasma includes a chamber 100, a power supply device 200, a emitter 300, a rod 400, and an insulator 500.

[0084] The chamber 100 is a tubular main body in which indoor air, ambient air, and exhaust gas flow (1). A ground power source is connected to the chamber 100.

[0085] The power supply device 200 is disposed outside the chamber 100 and continuously applies a voltage set as direct current or alternating current.

[0086] The emitter 300 is provided in the form of a hollow tubular main body and has a plurality of tips provided on the outer surface of the emitter 300 and configured to generate plasma.

[0087] The emitter 300 is disposed in the chamber 100 and is elongated in a direction parallel to the flow direction of indoor air, ambient air, and exhaust gas. The emitter 300 is electrically connected to the power supply device 200. The emitter 300 generates non-thermal plasma by means of a voltage difference between the emitter 300 and the chamber 100.

[0088] The rod 400 electrically connects the emitter 300 and the power supply device 200 and supports the emitter 300 such that the emitter 300 is disposed at the center inside the chamber 100.

[0089] The insulator 500 electrically insulates the rod 400 from the chamber 100 and prevents arc discharge from occurring between the rod 400 and the chamber 100.

[0090] Referring to Figure 1 and Figure 2, the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma is provided in the form of a hollow tubular body, which can be advantageously manufactured to be larger in size and lighter in weight than a rod-shaped device.

[0091] The electrons flow towards the surface of the conductor. Therefore, as the surface area of the emitter 300 increases, a larger plasma generation region can be achieved.

[0092] That is, according to Figure 1 and Figure 2 shown in the present disclosure, the tubular emitter 300 is more effective in increasing the plasma generation region.

[0093] In addition, the emitter 300 according to the present disclosure has a tip 310, so that the surface area of the emitter 300 is further increased, and the plasma diffuses smoothly from the tip 310.

[0094] In the case where the tip 310 is formed on the outer surface of the emitter 300, the distance between the emitter 300 and the inner surface of the chamber 100 decreases as the size of the emitter 300 increases.

[0095] On the contrary, even if the size of the emitter 300 increases, the distance between the rod 400 and the chamber 100 does not change.

[0096] The flow of current (electrons) occurs at the shortest distance between the positive and negative electrodes of the current. Therefore, the current flows through the portion between the protruding end of the tip 310 and the chamber 100, which has a relatively smaller distance than the distance between the rod 400 and the chamber 100. As a result, discharge is generated smoothly from the emitter 300, and plasma is also generated smoothly.

[0097] In addition, referring to Figure 1 and Figure 2 , in the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the most desirable ratio between the surface area of the emitter 300 and the area of the inner surface of the chamber 100 corresponding to the length of the emitter 300 is 1:1.

[0098] However, since the emitter 300 is disposed in the chamber 100, the surface area of the emitter 300 is generally smaller than the orthogonal protrusion area inside the chamber 100.

[0099] Therefore, the efficiency of generating non-thermal plasma increases as the most desirable ratio between the surface area of the emitter 300 and the area of the inner surface of the chamber 100 corresponding to the length of the emitter 300 approaches the ratio of 1:1.

[0100] To this end, the surface of the emitter 300 including the tip 310 may preferably be coated with carbon nanotubes (CNTs) having a large specific surface area.

[0101] Accordingly, the surface area of the emitter 300 is increased by the carbon nanotubes (CNTs), which makes it possible to improve the efficiency of generating non-thermal plasma and prevent the appearance of ozone generated when generating plasma.

[0102] As the vertical height h of the tubular body of the emitter 300 increases and as the surface area of the tip 310 increases or the number of tips 310 increases, the ratio further approaches or becomes equal to 1:1.

[0103] In the case where the cross-section of the emitter 300 in the height direction has a circular shape, the vertical height h of the emitter 300 is the diameter of the circular shape.

[0104] In addition, in the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the cross-sectional shape of each of the chamber 100 and the emitter 300 in the height direction may be a circular shape, an elliptical shape, or a polygonal shape.

[0105] In the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the pollutants may include pollutants contained in the target gas to be treated discharged from an external combustion engine or an internal combustion engine (such as a diesel engine, a gasoline engine, or a boiler). The pollutants may include polluted indoor air in a factory, a building, or an agricultural or livestock facility. The pollutants may include pollutants present in polluted air at a location where factories, buildings, or agricultural or livestock facilities are densely located.

[0106] Figure 3 is a diagram illustrating various embodiments of the tip shape.

[0107] Reference Figure 3 , the tip 310 provided on the emitter 300 has: a first tip shape including a conical shape 1100, a hemispherical shape, and an elliptical hemispherical shape 1400, a cylindrical shape 1410, a pyramidal shape 1110, a frustum pyramidal shape 1200, and a prismatic shape 1300; a second tip shape, such as shape 1500, in which a part or all of the lateral surface of the first tip shape has a curved surface having a circular shape or an elliptical shape, etc., instead of a flat surface; a third tip shape, such as shape 1600, in which a thread, a helical groove, or serrated teeth are formed spirally from the upper end to the lower end of the lateral surface of the first tip shape and the second tip shape; and a shape formed as a combination of the first tip shape, the second tip shape, and the third tip shape.

[0108] A shape formed as a combination of a first tip shape, a second tip shape, and a third tip shape may of course mean that the plurality of tips 310 have various shapes and also mean that the shape of each of the tips 310 can be formed as a combination of various shapes.

[0109] That is, the shape of the tip 310 includes a cylindrical shape, an elliptical cylindrical shape, a pyramidal shape, a prismatic shape (such as a conical shape, a hemispherical shape, an elliptical hemispherical shape, a spherical shape, a cylindrical shape, a quadrangular pyramidal shape, and a frustum of a pyramid shape), a shape in which a part or all of the lateral surface of one of the above shapes has a curved surface with a circular or elliptical shape or the like instead of a flat surface, a shape in which a thread, a spiral groove, or serrated teeth are formed helically on a part of the lateral surface of one of the above shapes or from the upper end to the lower end, and a shape derived from the above shapes, including vertex division, upper end surface division, unevenness at the center point of the upper end surface, or modifications such as combinations of these shapes.

[0110] Figure 4 It is a diagram illustrating various embodiments of the lid and the support.

[0111] Reference Figure 4 , a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure has a support 320 and a lid 330.

[0112] The support 320 is provided as a single support or a plurality of supports. The support 320 is installed in the emitter or at the end of the emitter and connects the rod 400 and the emitter 300.

[0113] The lid 330 is provided at one end or two opposite ends on the front side of the emitter 300 based on the longitudinal direction of the emitter and the flow direction of the target gas to be treated. The lid 330 isolates the interior of the emitter 300.

[0114] In addition, the lid 330 can connect the emitter 300 and the rod 400.

[0115] A lid including at least a conical shape, a hemispherical shape, and a flat shape can be installed as the lid 330. The lid 330 can prevent the target gas to be treated from being introduced into the tubular body shape of the emitter 300.

[0116] Figure 5 It is a diagram showing an embodiment of a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the device having a plurality of emitters arranged in sequence.

[0117] Figure 5Shows a state in which a part of the chamber 100 is cut out and removed. The tip on the outer surface of the emitter 300 is omitted.

[0118] Reference Figure 5 , in the device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present embodiment, a plurality of emitters 300 are sequentially arranged in the longitudinal direction of the chamber 100, while having different lengths and vertical heights h.

[0119] In this case, the emitter with a longer length among the plurality of emitters 300 is arranged on the downstream side based on the flow direction 1 of the target gas to be processed. Alternatively, the emitter with a smaller vertical height among the plurality of emitters 300 is arranged on the downstream side based on the flow direction 1 of the target gas to be processed.

[0120] When the shape of the emitter 300 in the vertical height direction is a circular shape, the vertical height of the emitter 300 can be the diameter.

[0121] When a plurality of emitters 300 are arranged in series to sequentially reduce pollutants in the target gas to be processed, the length and vertical height of the emitter 300 change according to the arrangement order of the emitters, so that the emitter 300 at the front end has a short length and a large vertical height h. Therefore, the distance between the tip 310 and the inner surface of the chamber 100 is reduced, which makes it possible to reduce the voltage to be applied.

[0122] This can reduce the fatigue of the power supply device 200, increase the service life of the power supply device 200, and prevent unnecessary arc discharge between the rod 400 and the chamber 100.

[0123] That is, the length of the emitter 300 increases in the direction from the upstream pollutant reduction device to the downstream pollutant reduction device among the arranged pollutant reduction devices. Therefore, the fatigue of the upstream pollutant reduction device can be reduced based on the series arrangement order. Therefore, the initially arranged emitter 300 has the shortest length, and the finally arranged emitter has the longest length.

[0124] Similarly, the vertical height h of the emitter 300 also changes according to the order of installing the pollutant reduction device. The vertical height h of the emitter 300 decreases in the direction from the most upstream pollutant reduction device to the downstream pollutant reduction device. Therefore, the fatigue of the upstream pollutant reduction device can be reduced. As the vertical height h of the emitter 300 increases, the applied voltage can be relatively low. The initially arranged emitter 300 has the largest diameter, and the finally arranged emitter 300 has the smallest diameter.

[0125] Therefore, when adjusting the vertical height h and the length of the emitter 300, the power supply device can adjust the applied voltage suitable for each of the emitters 300 in consideration of the height of the chamber 100, the vertical height h and the length of the emitter 300, etc., and then supply the voltage, which can prevent arc discharge, increase the efficiency of reducing pollutants, and reduce the fatigue of the power supply device 200.

[0126] In addition, referring to Figure 5 , in the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, a plurality of insulators are provided. The upstream insulator among the plurality of insulators is provided as a pseudo-insulator 500a to which no voltage is applied.

[0127] The pseudo-insulator 500a prevents the target gas to be treated from coming into direct contact with the downstream insulator, thereby preventing the pollution sources included in the target gas to be treated from accumulating on the surface of the downstream insulator.

[0128] Furthermore, the pseudo-insulator 500a can prevent unnecessary arc discharge caused by an increase in the concentration of pollution sources in the target gas to be treated around the downstream insulator.

[0129] In addition, when back pressure is generated as the chamber connected to the rear side of the plurality of insulators arranged in a line in the direction of the target gas to be treated as shown in Figure 5 narrows or bends, a rear spacing distance, which is the distance at which at least one insulator or one or more insulators can be installed at the rear side of the outermost insulator, needs to be ensured, and the chamber is connected to prevent the vortex or backflow of the target gas to be treated, prevent the pollution sources in the target gas to be treated from accumulating on the insulator due to the vortex or backflow of the target gas to be treated, and prevent arc discharge caused by the accumulated pollution sources.

[0130] In this case, within the distance where one or more insulators can be installed, the distance of one insulator is the distance between two adjacent insulators among the plurality of insulators arranged in a line.

[0131] In addition, when the chamber connected to the rear side of the plurality of insulators arranged in a line narrows or bends, the rear spacing distance increases as the degree of narrowing of the chamber or the angle of bending of the chamber increases.

[0132] That is, when the shape of the chamber connected to the rear side of the plurality of insulators arranged in a line is highly different from the shape of the chamber in which the plurality of insulators are arranged, the rear spacing distance can be increased, so that the vortex or backflow of the target gas to be treated can be prevented, the pollution sources in the target gas to be treated can be prevented from accumulating on the insulator, and the space can be ensured to the extent of the rear spacing distance.

[0133] Figure 6 FIG. 0 is a diagram showing an embodiment of a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma, the device having emitters arranged on concentric circles.

[0134] Figure 6 FIG. 5 shows a state in which a part of the chamber 100 is cut away and removed. The tips on the outer surface of the emitter 300 are omitted.

[0135] Reference Figure 6 , in a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the emitter 300 is configured to have a plurality of cylindrical or elliptical tubular bodies with different diameters or a plurality of polygonal tubular bodies with similar shapes and different sizes. The emitters 300 are arranged on concentric circles or at the same center point, while overlapping each other in the radial direction of the chamber 100. The plurality of emitters are arranged at equal intervals.

[0136] In this case, the chamber 100 has the same cross-sectional shape as the plurality of emitters 300 arranged on concentric circles or at the same center point.

[0137] When viewed from a vertical cutting plane of the chamber 100 in the fluid flow direction, the tubular body emitter 300, which is configured to be arranged at a predetermined interval between the emitter 300 and the center of the chamber, is mounted in multiple layers. The voltage decreases in the direction from the innermost emitter 300 to the outermost emitter 300, and the same voltage difference is set between the emitters 300 such that the voltage difference between the emitters 300 is equal to the voltage difference between the outermost emitter 300 and the chamber 100.

[0138] Different from the configuration in which a single emitter 300 applies voltage to the chamber 100, the subtraction voltage is calculated by dividing the voltage applied between the emitters 300 by the "number of emitters" and subtracting the result from the voltage applied between the outermost emitter 300 and the chamber 100. According to the order of the emitters arranged from the center, power is supplied such that the initially applied voltage is applied to the first emitter, the voltage generated by subtracting "subtraction voltage x1" from the initially applied voltage is applied to the second emitter, and the voltage generated by subtracting "subtraction voltage x2" from the initially applied voltage is applied to the third emitter.

[0139] This configuration is expressed by the following equations: "Voltage applied in the order of the emitters = initially applied voltage - subtraction voltage x (order of the emitter - 1)" and "subtraction voltage = initially applied voltage / number of emitters".

[0140] However, multiple rods are embedded in the insulator 500. In the case of the circular emitter 300, the rods need to be connected to the upper or lower end of the circle of all the emitters 300. Alternatively, each emitter needs to be inserted into the groove of the rod provided in the insulator 500 and connected to the rod in the insulator 500.

[0141] Figure 7 FIG. is a diagram showing an embodiment of an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma, the apparatus having an air curtain unit.

[0142] Reference Figure 7 , the apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas according to the present embodiment has an air curtain unit 700.

[0143] The air curtain unit 700 is configured to have a tubular body having various shapes, including a thin circular tube connecting the inside and outside of the chamber 100.

[0144] In addition, the air curtain unit 700 is provided on the upstream side of the insulator 500 based on the flow direction of the target gas to be processed. The air curtain unit 700 jets compressed air from the outside of the chamber 100 toward at least one of the front surface portion of the insulator 500 and the insulator 500.

[0145] The air curtain unit 700 prevents pollutants in the target gas to be processed from accumulating on the surface of the insulator 500 to a predetermined level or higher, and prevents arc discharge of pollutants along the surface of the insulator 500, thereby preventing deterioration of the efficiency of generating plasma.

[0146] The air curtain unit 700 strongly blows external clean air onto the surface of the insulator 500 and forms an air curtain 701 at the front end of the insulator 500, thereby preventing pollutants from accumulating on the front end surface of the insulator 500 and reducing the concentration of pollutants and the concentration of water vapor at the periphery of the surface of the insulator 500. Therefore, it is possible to prevent the voltage corresponding to the dielectric breakdown strength of general air (ambient air), which is 30 kV DC / cm, from rapidly dropping to a low level (for example, 10 kV DC / cm or less) of the dielectric breakdown voltage of the target gas to be processed due to the high concentration of pollutants and water vapor in the target gas to be processed, thereby preventing arc discharge.

[0147] In addition, the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment may have a nitrogen oxide reduction metal catalyst device disposed on the downstream side of the air curtain unit 700. The metal catalyst device may reduce the amount of nitrogen oxides in the target gas to be treated by promoting the reaction of oxygen and nitrogen contained in the compressed air and nitrogen oxides contained in the target gas to be treated.

[0148] In particular, the nitrogen oxide reduction metal catalyst device may include at least one of vanadium and zeolite as a mixture of metal materials.

[0149] The device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment may have an ozone removal metal catalyst device disposed on the downstream side of the emitter, and allow the metal catalyst to remove ozone remaining in the target gas to be treated in the chamber.

[0150] The ozone removal metal catalyst may include at least one of manganese oxide (MnOx), titanium dioxide (TiO2), and zeolite as a mixture of metal materials.

[0151] In addition, in the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the nitrogen oxide reduction metal catalyst device is installed together with the air curtain unit. Therefore, nitrogen and oxygen contained in the compressed air ejected from the air curtain unit can be used to promote the reaction of the metal catalyst of the nitrogen oxide pollutant reduction device to reduce nitrogen oxides contained in the target gas to be treated.

[0152] Figure 8 FIG. is a cross-sectional view based on the flow direction of the target gas to be treated showing another embodiment of the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure.

[0153] Reference Figure 8 , in the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the rod 400 has a vertical rod 410 and a horizontal rod 420.

[0154] The vertical rod 410 extends from one side of the inner surface of the chamber 100 to the center of the chamber 100. In addition, the horizontal rod 420 extends along the center of the chamber 100, and the emitter 300 is coupled to the distal end of the horizontal rod 420.

[0155] The insulator 500 surrounds the vertical rod 410 from one side of the inner surface of the chamber 100. The insulator 500 may have a certain length such that the vertical rod 410 is exposed by a preset height h from the horizontal rod 420.

[0156] The preset height h is 1 / 2 or less of the vertical height h of the emitter 300.

[0157] Figure 9 It is a cross-sectional view based on the flow direction of the processing target gas showing various other embodiments of a device for reducing pollutants in indoor air, ambient air, or exhaust gas according to the present disclosure, the device having an anti-arc discharge chamber.

[0158] Reference Figure 9 , in a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the chamber 100 has an anti-arc discharge chamber 110.

[0159] The anti-arc discharge chamber 110 is a space formed to protrude outwardly on one side of the inner surface of the chamber 100.

[0160] In this case, the rod 400 has: a vertical rod 410 extending from one side of the inner surface of the anti-arc discharge chamber 110 to the center of the chamber 100, and a horizontal rod 420 extending along the center of the chamber 100 and having a distal end connected to the emitter.

[0161] The shortest distance between the horizontal rod 420 and the inner surface of the anti-arc discharge chamber 110 is greater than the radius of the chamber 100, so that the anti-arc discharge chamber 110 can prevent arc discharge between the anti-arc discharge chamber 110 and the horizontal rod 420.

[0162] In addition, as Figure 9 shown, in a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the chamber 100 has a preset length b.

[0163] In this case, the length a from the upper end of the vertical rod 410 of the insulator 500 can be equal to or longer than the preset length b.

[0164] In addition, in this case, the horizontal length c from the edge where the anti-arc discharge chamber 110 meets the chamber 100 to the vertical rod 410 is equal to or shorter than the preset length of the horizontal rod 420.

[0165] Therefore, the orthogonal protrusion of the emitter 300 is positioned on the inner surface of the chamber 100, and the distance between the emitter 300 and the chamber 100 is shorter than the distance between the horizontal rod 420 and the inner surface of the anti-arc discharge chamber 110, so that arc discharge between the horizontal rod 420 and the anti-arc discharge chamber 110 is prevented.

[0166] The cross-section of the arc discharge prevention chamber 110 based on the flow direction 1 of the target gas to be processed may have a shape selected from among shapes that partially define a circular, elliptical, and polygonal shape.

[0167] In addition, the arc discharge prevention chamber 110 may be installed in an annular shape partially along the peripheral portion of the chamber 100 or along the entire periphery of the chamber 100.

[0168] Figure 10 FIG. is a diagram showing an embodiment of an apparatus for reducing contaminants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the apparatus having a reverse emitter.

[0169] Reference Figure 10 , in an apparatus for reducing contaminants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the emitter 300 is positioned on the downstream side based on the flow direction 1 of the target gas to be processed.

[0170] Therefore, the target gas to be processed does not directly collide with the surface of the insulator 500 on this side of the emitter 300. Accordingly, accumulation of a pollution source and water vapor contained in the target gas to be processed can be prevented, thereby preventing arc discharge caused by the accumulated pollution source and water vapor.

[0171] The insulator 500 of an apparatus for reducing contaminants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure and having a reverse emitter may further include an insulator cleaning device that can prevent accumulation (501) of a pollution source and water vapor contained in the target gas to be processed on the surface of the insulator 500 or can remove the pollution source and water vapor.

[0172] In another embodiment of an apparatus for reducing contaminants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the upper and lower ends of the insulator may be made of two or more different electrical insulating materials, or the outer and inner portions of the insulator may be made of two or more different electrical insulating materials.

[0173] For example, the upper side of the insulator close to the inside of the chamber may be made of an alumina ceramic material, and the lower side of the insulator close to the horizontal rod may be made of ceramic glass.

[0174] As another example, the center of the insulator may be made of ceramic glass, while the outer sheath may be made of an alumina ceramic material.

[0175] Figures 11 to 20FIG. 0 is a diagram showing various embodiments of an insulator cleaning device for a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma, the device having a reverse emitter.

[0176] Reference Figure 11 , in a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the insulator cleaning device is a dust collector 810 that can remove pollution sources and water vapor accumulated on the surface of the insulator opposite to the emitter 300.

[0177] The dust collector 810 can be fixed to the end of a rod-shaped support 811.

[0178] The support 811 can be rotated about its longitudinal direction so as to easily remove pollution sources and water vapor. In addition, the dust collector 810 can be rotated to move toward or away from the insulator 500.

[0179] In addition, reference Figures 12 to 13 , in a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the insulator cleaning device is an electric heating device 820 that can maintain the insulator 500 at a high temperature to burn and remove pollution sources and water vapor accumulated on the surface of the insulator 500.

[0180] Specifically, the electric heating device 820 can be a heating device that is a heating wire or element installed and embedded in the insulator 500 or a heating wire or element wound around the surface of the insulator 500.

[0181] The electric heating device 820 can heat the entire insulator 500 or only heat a portion of the entire insulator 500 that is arranged adjacent to the horizontal rod.

[0182] In addition, referring to Figures 14 to 20 , in a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the insulator cleaning device is a spray cleaning device.

[0183] Figure 14 , Figure 16 and Figure 18 show examples of a fuel injection insulator cleaning device.

[0184] Figure 15 FIG. is a diagram showing a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma as viewed from above, and Figure 14 FIG. is a diagram showing a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma as viewed in the direction of introducing a target gas to be treated, and Figure 17 FIG. is a diagram showing a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma as viewed in the direction of introducing a target gas to be treated, andFigure 16 A diagram of a device for reducing pollutants in indoor air, ambient air, or exhaust gas using non-thermal plasma in it.

[0185] In addition, Figure 19 is a diagram showing, when observing the insulator in the direction in which the target gas to be treated is discharged, a device 2500 for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma in it, and showing a cross-section 2600 in the width direction when observed from above. Figure 18 A diagram of a device for reducing pollutants in indoor air, ambient air, or exhaust gas using non-thermal plasma in it.

[0186] First, referring to Figures 14 to 15 , the injection cleaning device according to the present embodiment can inject at least gas-containing fuel from the outside of the chamber 100 toward a part or all of the front surface portion of the insulator 500, and burn and remove the pollution source and water vapor accumulated on the surface of the insulator 500.

[0187] In this case, the injection cleaning device may have an ignition device configured to ignite the fuel injected into at least any one of the injection cleaning device 900, the chamber 100, and the insulator 500.

[0188] Figures 14 to 15 The injection cleaning device shown in may include a tubular body having various shapes, and the tubular body includes a thin circular tube connecting the inside or outside of the chamber 100. The injection cleaning device may be disposed on the upstream side of the insulator 500 based on the flow direction of the target gas to be treated.

[0189] In addition, referring to Figures 16 to 17 , the injection cleaning device according to the present embodiment can inject gas-containing fuel from the outside of the anti-arc discharge chamber 110 toward a part or all of the front surface portion of the insulator 500, and burn and remove the pollution source and water vapor accumulated on the surface of the insulator 500.

[0190] In this case, the injection cleaning device may have an ignition device configured to ignite the fuel injected into at least any one of the injection cleaning device 900, the chamber 100, the anti-arc discharge chamber 110, and the insulator 500.

[0191] Next, referring to Figures 18 to 19 , in the injection cleaning device according to the present embodiment, a thin tube 910 or a hole is provided in the insulator 500 to convey gas-containing fuel from one end of the insulator 500 installed outside the chamber 100. The injection cleaning device heats the surface of the insulator 500 by injecting gas or fuel, thereby burning and removing the pollutants and water vapor accumulated on the surface of the insulator 500.

[0192] Furthermore, referring toFigure 20 The insulator 500 may have its own holes 920 and eject fuel containing gas, thereby burning and removing contaminants and water vapor accumulated on the surface of the insulator.

[0193] Figure 21 and Figure 22 FIGS. are diagrams showing various embodiments of a device for reducing contaminants in indoor air, ambient air, or exhaust gas by using non-thermal plasma, Figure 10 in which reverse emitters are sequentially arranged in the device.

[0194] Reference Figure 21 and Figure 22 shows that in the device for reducing contaminants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, reverse emitters are sequentially arranged in the device.

[0195] Because Figure 21 and Figure 22 the structure shown in (in which reverse emitters are sequentially arranged) is the same as the structure in which a plurality of emitters shown in Figure 5 are sequentially arranged therein, its description will be omitted.

[0196] In addition, when the back pressure increases as the chamber 101 behind a plurality of insulators arranged in a row in the direction 1 of the target gas to be processed as shown in Figure 21 and Figure 22 narrows or bends, rear spacing distances D1 and D2 for the distance at which at least one insulator or one or more insulators can be installed at the rear side of the last insulator need to be ensured, and the chamber 101 is connected to prevent vortex or backflow of the target gas to be processed, prevent the pollution source in the target gas to be processed from accumulating on the insulator due to the vortex or backflow of the target gas to be processed, and prevent arc discharge caused by the accumulated pollution source.

[0197] In this case, the distance at which one insulator 500 or one or more insulators 500 can be installed is the distance between two adjacent insulators among the plurality of insulators 500 arranged in a row.

[0198] In addition, referring to Figure 22 , when the chamber 101 connected to the rear side of the plurality of insulators 500 arranged in a row narrows or bends, the rear spacing distance increases as the degree of narrowing of the chamber or the angle of bending of the chamber increases.

[0199] That is, when the shape of the chamber 101 connected to the rear side of a plurality of insulators arranged in a row is highly different from the shape of the chamber in which the plurality of insulators are arranged, the rear spacing distance can be increased, so that the vortex or backflow of the processing target gas can be prevented, the accumulation of pollution sources in the processing target gas on the insulators can be prevented, and the space can be ensured to the extent of the rear spacing distance.

[0200] In Figure 21 the rear spacing distance D1 is set to a distance at which one insulator 500 can be installed.

[0201] In contrast, Figure 22 it is shown that the width of the chamber 101 connected to the rear side of the insulator becomes extremely smaller than the width of the chamber 100, so that the rear spacing distance becomes (D1 + D2), and the rear spacing distance D1 can be set to a distance at which two insulators 500 can be installed.

[0202] Figure 23 is a diagram showing an embodiment of a device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present disclosure, the device having an outer sheath at the upper end of the insulator and an outer sheath at the lower end of the insulator.

[0203] Referring to Figure 23 , the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment may further include at least any one of an upper end outer sheath 502 and a lower end outer sheath 503 surrounding the outer surface of the insulator 500.

[0204] The upper end outer sheath 502 is made of a metal conductor including stainless steel and copper. The upper end outer sheath 502 has a length equal to or less than a preset height from one side of the inner surface of the chamber and surrounds the outer surface of the insulator.

[0205] The lower end outer sheath 503 is made of a metal conductor including stainless steel and copper. The lower end outer sheath 503 has a length equal to or less than a preset height from the position of the horizontal bar and surrounds the outer surface of the insulator.

[0206] In particular, the upper end outer sheath 502 includes an upper end outer sheath 502 of the insulator, which is configured to surround the periphery of the surface of the insulator 500 at a predetermined height at the portion where the chamber 100 and the insulator 500 are fastened, and the upper end outer sheath 502 of the insulator is spaced apart from the inner surface of the chamber 100.

[0207] When only one of the upper insulator outer sheath and the lower insulator outer sheath is installed, its height particularly needs to be less than 1 / 2 of the vertical height h of the emitter. Alternatively, when both the upper insulator outer sheath and the lower insulator outer sheath are installed simultaneously, the sum of the heights of the sheaths particularly needs to be less than 1 / 2 of the vertical height h of the emitter.

[0208] In the case of adopting the above structure, the upper insulator outer sheath 502 and the lower insulator outer sheath can easily cause arc discharge, which makes it possible to prevent the pollution sources and water vapor contained in the target gas to be processed from accumulating on the surface of the insulator 500.

[0209] The upper outer sheath 502 and the lower outer sheath 503 are arc discharge generating structures that intentionally and frequently generate small-scale arc discharges.

[0210] Arc discharge occurs when pollutants and water vapor accumulate on the surface of the insulator. In the case where arc discharge occurs in a state where a large amount of pollutants and water vapor have accumulated, a large voltage loss occurs to the extent that a voltage drop appears in the entire system.

[0211] The upper outer sheath 502 and the lower outer sheath 503 cause small-scale arc discharges, accompanied by a small voltage drop from the arc discharge due to the pollutants and water vapor accumulated on the surface of the insulator.

[0212] Only one of the upper outer sheath 502 and the lower outer sheath 503 (5020, 5030) or both (502030) can be installed. Only the upper outer sheath 502 (5020) can be installed.

[0213] Figure 24 It is a diagram showing an embodiment of a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present disclosure, and the device has a water vapor removal device in the chamber 100.

[0214] Reference Figure 24 , a device is provided that can surround the outer surface of the chamber 100 with a heating insulator 100a and heat the heating insulator, and the device heats the chamber by operating before the engine starts or when the engine starts initially.

[0215] The chamber is heated and maintained at an appropriate temperature, which makes it possible to prevent unnecessary arc discharge caused by internal condensation of water vapor that occurs when the engine starts initially.

[0216] In this case, an example of the heat generating device is to heat the heating insulator 100a by applying current.

[0217] Figure 25FIG. is a diagram showing an embodiment of an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma, the apparatus having a bidirectional emitter.

[0218] Reference Figure 25 , in an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the emitter 300 may be disposed at the front side and the rear side of the vertical rod based on the flow direction of the target gas to be treated.

[0219] Since two emitters 300 mounted on a single insulator generate plasma, only pollutants and water vapor accumulated on the surface of the single insulator can be removed. Therefore, even if a single power supply device (the power supplied is lower than the sum of the powers provided by two power supply devices) is provided, the pollution source in the target gas to be treated can be effectively removed.

[0220] Figure 26 FIG. is a diagram showing various embodiments of an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma, the apparatus having various chambers.

[0221] Reference Figure 26 , in an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the chamber 100 is configured as a tubular body made of a straight tubular body, a bent tubular body, or a combination thereof. In this case, the center of the emitter 300 is always located at the center of the chamber 100.

[0222] In Figure 26 , the chamber may be a bent tubular body 3100, a composite straight tubular body 3200 having different directions, or a straight tubular body 3300 having a longitudinal direction and a cross-sectional direction that are not perpendicular to each other.

[0223] In yet another embodiment, an apparatus for reducing pollutants in indoor air, ambient air, or exhaust gas according to the present disclosure may further include a reverse power application device.

[0224] When the reverse power application device supplies direct current to the power supply device, the reverse power application device supplies power to the emitter while instantaneously changing the polarities of the (+) and (-) poles of the power supply device in an appropriate cycle.

[0225] Despite the flow of the target gas to be treated, a large amount of pollutants ionized in the chamber 100 can be adsorbed due to the (+) or (-) polarity.

[0226] However, when the flow rate of the target gas to be processed increases, the adsorbed pollutants are unexpectedly separated, which can lead to arc discharge at the edge of the insulator 500. Therefore, it is necessary to separate the ionized pollutants before a large amount of pollutants are adsorbed.

[0227] The device with a reverse power application device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma frequently separates the pollutants adsorbed in the chamber 100 and discharges the pollutants smoothly, thereby preventing over-dense arc discharge and preventing deterioration of the efficiency of generating plasma.

[0228] Figures 27 to 33 FIG. is a diagram showing an embodiment of a device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present disclosure, in which the interior of the chamber is separated.

[0229] Reference Figures 27 to 33 , in another embodiment, the device for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma according to the present disclosure has a bundle of unit chambers provided on the flow path of the target gas to be processed in the chamber and configured to divide the entire vertical cross-section into a plurality of cross-sections in the flow direction of the target gas to be processed.

[0230] In particular, the plurality of unit chambers constituting the bundle of unit chambers have cross-sections with the same shape, and emitters are provided at the centers inside each of the plurality of unit chambers.

[0231] The shape of the outer surface of the emitter is similar to the inner surface of the unit chamber. The emitter is always positioned at a predetermined position within the shortest distance from any position on the outer surface of the emitter to the inner surface of the unit chamber.

[0232] Figures 27 to 29 FIG. shows the chamber 100 having the unit chamber 100u and the bundle of unit chambers (100bundle-rec) and the bundle of unit chambers (100bundle-rec) using the unit chamber 100u, and an emitter 300u having a cross-sectional shape of a circular-edge quadrilateral shape is provided in the unit chamber 100u.

[0233] First, Figure 27 FIG. shows a cross-sectional view 4100 and a perspective view 4200, showing an emitter 300u and a chamber 100u having a cross-sectional shape of a circular-edge quadrilateral shape.

[0234] Figure 28 FIG. shows the bundle of unit chambers (100bundle-rec), Figure 27A plurality of chambers 100u are arranged side by side in the beam unit chamber (100bundle-rec). In this case, each of the chambers is a unit chamber.

[0235] Figure 29 shows Figure 28 The beam unit chamber (100bundle-rec) in is arranged in another large chamber 100.

[0236] As Figure 29 shown, multiple beam unit chambers (100bundle-rec) can be arranged in the flow direction of the target gas to be processed.

[0237] Figure 30 Sectional view 5100 and perspective view 5200 are shown, showing a chamber with a cross-section having a square shape with rounded edges, and Figure 31 is a view showing a beam unit chamber (100bundle-sq) having a square shape with rounded edges.

[0238] Figure 32 Sectional view 6100 and perspective view 6200 are shown, showing a chamber with a cross-section having a triangular shape with rounded edges, and Figure 33 is a view showing a beam unit chamber (100bundle-tri) having a triangular shape with rounded edges.

[0239] The beam unit chamber can be inserted into a portion of the chamber where it is cut to a predetermined length, and the target gas to be processed, which is the indoor air, ambient air, or exhaust gas including pollutants, passes through the chamber, and two opposite ends of the beam unit chamber can be connected to the cut surfaces of the chamber.

[0240] In addition, in the case of a stack (exhaust passage) similar to an LNG power station, the chamber through which the target gas to be processed passes is a non-conductor through which current cannot flow, and the beam unit chamber can be inserted into the chamber. In this case, it is basically not necessary to provide an insulator because the chamber is a non-conductor.

[0241] In addition, referring to Figures 34 to 35 , the connecting horizontal rod 400c can be sufficiently elongated from the beam unit chamber so that a spacing distance for high-voltage current from the beam unit chamber can be ensured. The connecting vertical rod 410c can connect a plurality of connecting horizontal rods 400c, thereby supplying power to a plurality of emitters through a single wire.

[0242] In this case, multiple connected connecting horizontal bars 400c and connecting vertical bars 410c can connect the unit emitters 300u in a single-bundle unit chamber or the unit emitters in a multi-bundle unit chamber. The multiple connecting vertical bars 410c can be straightly arranged between the upper and lower ends of the chamber by connecting insulators 500c provided between the connecting vertical bars 410c. The connecting vertical bars 410c fastened in the up / down direction by the connecting insulators 500c are separated from each other.

[0243] The multi-bundle unit chamber includes dozens to hundreds of unit chambers. Therefore, even if arc discharge occurs in one or more unit chambers, the influence on the efficiency of generating the entire plasma can be minimized, which enables prevention of deterioration of the efficiency of generating the entire non-thermal plasma.

[0244] In the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, multiple unit chambers (i.e., the bundle unit chambers isolated from each other) are arranged in the chamber such that the unit chamber in which arc discharge occurs is separated from the unit chamber in which plasma is generated, and pollutants are reduced.

[0245] Therefore, even if arc discharge occurs in some unit chambers, the function of reducing pollutants can be continuously performed.

[0246] Figure 36 It is shown that the multi-bundle unit chamber (100bundle-rec) is arranged in the longitudinal direction of the chamber.

[0247] Reference Figure 36 , the multi-bundle unit chamber (100bundle-rec) can be arranged in the flow direction of the gas to be processed.

[0248] Figures 37 to 39 is a diagram for explaining the insulating member.

[0249] Referring to Figure 37 , in the device for reducing pollutants in indoor air, ambient air, or exhaust gas by using non-thermal plasma according to the present embodiment, the vertical bar 410 is divided into two or more vertical bars 410, and the insulating member 1000 is inserted between the separated vertical bars 410.

[0250] Referring to Figure 38 , and Figure 37 In the same structure as shown in, the horizontal bar 420 is divided into two or more horizontal bars 420, and the insulating member 1000 is inserted between the separated horizontal bars 420.

[0251] Reference Figure 39, before the vertical rod 410 is connected to the horizontal rod 420, two vertical rods 410 branch off from the vertical rod 410, and the insulating member 1000 can be inserted into the two branched vertical rods respectively. In this case, the horizontal rod 420 is connected to the two branched vertical rods respectively.

[0252] When the magnitude of the voltage applied to the separated vertical rod 410 or the separated horizontal rod 420 is higher than a preset limit voltage, the insulating member 1000 allows current to flow through the insulating member 1000. When the magnitude of the voltage applied to the separated vertical rod 410 or the separated horizontal rod 420 is higher than the limit voltage, the insulating member 1000 blocks the current.

[0253] Therefore, when the voltage applied to the separated vertical rod 410 or the separated horizontal rod 420 due to the occurrence of arc discharge becomes equal to or lower than the limit voltage, the flow of current can be blocked, thereby removing the arc discharge occurring in the emitter.

[0254] More specifically, the insulating member 1000 provided between the separated vertical rod 410 or the separated horizontal rod 420 automatically blocks the power when the voltage decreases as arc discharge occurs in the emitter, so that the arc discharge is eliminated. Since there is no arc discharge, the normal voltage is instantaneously restored, allowing current to flow through the insulating material.

[0255] The insulating member 1000 can be made of an insulating material and is configured as a spherical body, an elliptical body, or a polyhedral body having a size equal to or smaller than the diameter of the horizontal rod and the diameter of the vertical rod. The separated horizontal rod 420 and the separated vertical rod 410 can be arranged in close contact with the insulating member 1000.

Claims

1. An apparatus for reducing pollutants in indoor air, ambient air or exhaust gas by using non-thermal plasma, the apparatus comprising: a chamber configured as a tubular body through which a processing target gas, which is indoor air, ambient air or exhaust gas containing pollutants, flows, the chamber being connected to a ground power source; a power supply device disposed outside the chamber and configured to continuously apply a voltage of a certain magnitude set as direct current or alternating current; a emitter configured as a hollow tubular body having a plurality of tips formed on an outer surface of the hollow tubular body and configured to generate plasma, the emitter being disposed in the chamber, elongated in a direction parallel to a flow direction of the processing target gas, electrically connected to the power supply device, and configured to generate non-thermal plasma; a rod configured to electrically connect the emitter and the power supply device and support the emitter such that the emitter is disposed at a center of an interior of the chamber; and an insulator configured to electrically insulate the rod and the chamber and prevent arc discharge from occurring between the rod and the chamber, wherein the apparatus further includes a bundle of unit chambers disposed in a flow path of the processing target gas in the chamber and configured to divide an entire vertical cross-section into a plurality of cross-sections in the flow direction of the processing target gas, wherein the plurality of unit chambers constituting the bundle of unit chambers have the same-shaped cross-sections, wherein the emitter is disposed at a center of an interior of each of the plurality of unit chambers, wherein a shape of an outer surface of the emitter is similar to an inner surface of the unit chamber, and wherein the emitter is always positioned at a predetermined position within a shortest distance from an arbitrary position on the outer surface of the emitter to the inner surface of the unit chamber.

2. The device according to claim 1, wherein The emitter is provided as a plurality of emitters, wherein the plurality of emitters have different lengths and vertical heights and are sequentially disposed in a longitudinal direction of the chamber, and wherein among the plurality of emitters, the emitter having a long length or a small vertical height is disposed at a downstream side based on the flow direction of the processing target gas.

3. The device according to claim 1, wherein The emitter is provided as a plurality of emitters, wherein the plurality of emitters are each configured to be similar to the tubular body of the chamber and have different diameters or sizes, wherein the plurality of emitters are disposed on concentric circles or at the same center point while overlapping each other in a radial direction of the chamber, and wherein the plurality of emitters are disposed at the same intervals.

4. The apparatus according to claim 1, the apparatus comprising: An air curtain part, the air curtain part being configured to have a tubular body with various shapes including at least a thin circular tube, the air curtain part being configured to connect the outside and the inside of the chamber, being disposed on the upstream side of the insulator based on the flow direction of the target gas to be processed, and being configured to eject compressed air from the outside of the chamber toward at least any one of the insulator, the upstream side of the insulator, or the front surface portion of the insulator.

5. The apparatus according to claim 4, the apparatus comprising: A nitrogen oxide reduction metal catalyst apparatus, the nitrogen oxide reduction metal catalyst apparatus being disposed on the downstream side of the emitter based on the flow direction of the target gas to be processed and being configured to contain one or more materials selected from the group consisting of vanadium, zeolite, and metal catalyst, wherein the nitrogen oxide reduction metal catalyst apparatus reduces nitrogen oxides in the target gas to be processed by promoting the reaction of nitrogen oxides contained in the target gas to be processed.

6. The apparatus according to claim 4, the apparatus comprising: An ozone removal metal catalyst apparatus, the ozone removal metal catalyst apparatus being disposed on the downstream side of the emitter based on the flow direction of the target gas to be processed and being configured to contain one or more materials selected from the group consisting of manganese oxide (MnOx) catalyst, titanium dioxide (TiO2) catalyst, or zeolite catalyst and other metal catalysts, wherein the ozone removal metal catalyst apparatus reduces ozone remaining in the target gas to be processed.

7. The device according to claim 1, wherein The insulator further includes an insulator cleaning device, the insulator cleaning device being configured to prevent the accumulation of pollution sources and water vapor on the surface of the insulator or to remove the pollution sources and water vapor accumulated on the surface of the insulator.

8. The apparatus according to claim 1, the apparatus comprising: A heat generating device, the heat generating device being configured to surround the outer surface of the chamber and being configured to be a heat generating insulator or included in the apparatus, wherein the heat generating device prevents arc discharge caused by the condensation of water vapor contained in the target gas to be processed at the time point when the generation of the target gas to be processed starts.

9. The apparatus according to claim 1, wherein, The upper end and the lower end of the insulator are made of two or more different electrical insulating materials, or the outer portion and the inner portion of the insulator are made of two or more different electrical insulating materials.

10. The device according to claim 1, wherein, A vertical rod or a horizontal rod is divided into two or more vertical rods or horizontal rods in the longitudinal direction, wherein the apparatus further includes an insulating member, the insulating member being disposed to be inserted into the separated vertical rods or the horizontal rods such that the separated vertical rods or the horizontal rods are connected in the longitudinal direction, wherein when a voltage higher than a preset limit voltage is applied between the separated vertical rods or the horizontal rods, the insulating member allows current to flow smoothly between the separated vertical rods or the horizontal rods, and Wherein, when a voltage equal to or lower than the preset limit voltage is applied between the separated vertical bars or the horizontal bars, the insulating member blocks the flow of current between the separated vertical bars or the horizontal bars.

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