KR101934100B1 - System for reducing particulate matter in exhaust - Google Patents

Abstract

The disclosed particulate matter reduction system of the exhaust gas comprises: a first conductor provided as a tube into which a gas stream flows, and to which a ground power source is connected; a second conductor disposed within the first conductor, having an emitter in contact with the gas stream and manufacturing non-thermal plasma (NTP); and an insulator electrically isolating the second conductor from the first conductor, wherein a DC voltage of a predetermined magnitude is applied to the second conductor continuously. According to the present invention, deterioration of the efficiency of the particulate matter reduction system of the exhaust gas can be prevented.

Description

[0001] The present invention relates to a system for reducing particulate matter in exhaust gas,

Disclosure of the Invention The present invention relates to a particulate matter reduction system for exhaust gas, and more particularly, to a particulate matter reduction system for removing particulate matter (PM) contained in an exhaust gas generated in an automobile, a semiconductor process, or the like by using a non-thermal plasma (NTP) Thereby reducing the amount of particulate matter discharged into the atmosphere.

Herein, the background art relating to the present invention is provided, and they are not necessarily referred to as known arts.

Internal combustion engines that are fueled by gasoline or diesel are a major cause of environmental pollution, affecting not only human health and longevity, but the overall environment as well.

Carbon monoxide (CO), nitrogen oxides (NOx), sulfur dioxide (SO2), non-methane hydrocarbons (NMHC), and particulate matter (PM) are generated as a result of incomplete combustion of gasoline or diesel engines.

Despite decades of regulation, pollutants such as these continue to be released to the environment in quantities exceeding regulatory standards in countries with strict emission controls.

Moreover, the robust technology that meets these standards is difficult to achieve today.

One technique that provides great potential for reducing combustion engine emissions, particularly particulate emissions, is to use low temperature plasma (NTP) to improve combustion efficiency and reduce exhaust emissions.

Studies on combustion efficiency have shown that low temperature plasma (NTP) can be used to more easily and completely divide organic fuel molecules into smaller molecules, as disclosed in U.S. Patent Publication Nos. 2004/0185396, 2005 / 0019714 and 2008/0314734, for example.

On the other hand, another study reports that cold plasma (NTP) can be used to directly reduce emissions of exhaust gases.

For example, in a majority of low temperature plasma (NTP) studies, it relates to systems for the purpose of reducing NOx emissions, examples of which are described in U.S. Patent Nos. 6,482,368 and 6,852,200.

On the other hand, other systems use low temperature plasma (NTP) to reduce particulate matter (PM). For example, the descriptions of U.S. Patent No. 5,263,317 and U.S. Patent Publication No. 2007/0045101 are exemplified.

Despite the appeal of low temperature plasma (NTP) based systems to reduce these emissions, the use of this technology has been complicated by the effects of pollutants and exhaust gas decomposition products on these systems.

In particular, particulate matter (PM) may reduce or destroy the efficiency of a low temperature plasma (NTP) system by coating elements related to the production of low temperature plasma (NTP).

When NTP is electrically generated, particulate matter (PM) accumulation is caused by redirection of current due to the conduction path created by the accumulation of this conductor, which causes power loss, The amount of low temperature plasma (NTP) is reduced, and the removal efficiency of particulate matter is lowered.

It is also the amount of power consumed to reduce the particulate matter PM. Current low temperature plasma (NTP) systems consume hundreds of watts of power and can reduce particulate matter (PM) by only 25%. Therefore, there is a need to develop a low temperature plasma (NTP) system in which the reduction of particulate matter (PM) per power is significantly increased.

1. U.S. Patent No. 5,263,317 2. U.S. Patent Application Publication 2007/0045101

Disclosure is directed to providing a particulate matter abatement system for a low temperature plasma (NTP) based exhaust gas that reduces the amount of particulate matter (PM) in a gas stream such as exhaust gas.

DISCLOSURE OF THE INVENTION The present invention provides a system for reducing the particulate matter of a low temperature plasma (NTP) based exhaust gas in which the accumulation and arcing of particulate matter, which is a cause of reduction in generation of low temperature plasma (NTP) .

The present invention is not intended to be exhaustive or to limit the scope of the present invention to the full scope of the present invention. of its features).

In order to solve the above-mentioned problems, a particulate matter reduction system for an exhaust gas according to an aspect of the present invention includes: a first conductor provided with a gas stream into which a gas stream flows, the ground power source being connected; A second conductor disposed within said first conductor, said second conductor having an emitter in contact with said gas stream and producing a low temperature plasma (NTP); And an insulator electrically isolating the second conductor from the first conductor, wherein DC voltage of a predetermined magnitude is continuously applied to the second conductor.

In a particulate matter reduction system for an exhaust gas according to an aspect of the present invention, the secondary conductor comprises: a vertical rod arranged in the radial direction of the primary conductor; A horizontal rod extending at an end of the vertical rod in a direction parallel to the flow direction of the gas stream; And an emitter provided at a distal end of the horizontal rod and having a plurality of protrusions having apexes on an outer surface thereof.

In a particulate matter abatement system for an exhaust gas according to an aspect of the present invention, the insulator is provided as an electrically insulating material and is arranged to surround the vertical rod, and one end is disposed inside the first conductor And the other end of the first conductor is disposed outside the first conductor to electrically isolate the second conductor from the first conductor, and the first conductor and the second conductor are connected to each other, And an engaging groove into which the horizontal rod is inserted.

In a particulate matter reduction system for an exhaust gas according to an aspect of the present invention, the particulate matter reduction system of the present invention is provided with an annular cover provided to cover one end of the insulator, which is disposed inside the first conductor, And an arc preventing member made of a material having non-discharge corrosive non-eroding property.

In a particulate matter abatement system for an exhaust gas according to an aspect of the present invention, the emitter is located in the inner center of the first conductor, and the horizontal rod is arranged in a direction from the vertical rod toward the upstream of the gas stream And is extended and disposed.

In a particulate matter reduction system for an exhaust gas according to an aspect of the present invention, the insulator has a shape in which the horizontal cross-sectional area decreases in a direction from the wall surface of the first conductor to the horizontal rod inside the first conductor .

In a particulate matter reduction system for an exhaust gas according to an aspect of the present invention, the secondary conductor is characterized in that a cathode power source is applied.

In the particulate matter reduction system of the exhaust gas according to an aspect of the present invention, the direct current voltage applied to the second conductor is characterized by being -30 kV to -80 kV.

In a particulate matter reduction system of the exhaust gas according to an aspect of the present invention, the second conductors are arranged in plural along the longitudinal direction of the first conductor, each of them is electrically insulated from the first conductor, And an emitter for generating a plasma (NTP).

According to the present invention, since DC power of a predetermined magnitude is continuously applied to the second conductor, incomplete removal (or decomposition) of particulate matter PM due to overshooting of power can be prevented, The particulate matter (PM) or decomposition products thereof are prevented from accumulating.

Therefore, deterioration of the efficiency of the particulate matter reduction system of the exhaust gas can be prevented.

According to the present invention, it is possible to prevent the generation of an arc due to the particulate matter (PM) accumulated on the surface of the insulator or its decomposition product by the arc preventing member.

Therefore, deterioration of the efficiency of the particulate matter reduction system of the exhaust gas can be prevented.

According to the present invention, the assembly convenience of the second conductor and the insulator can be improved by the engagement groove and the arc preventing member formed at the end of the insulator, and the second conductor can be parallel to the gas stream at the center of the first conductor It can be arranged in one direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a particulate matter reduction system for an exhaust gas according to the present invention. FIG.
FIG. 2 and FIG. 3 illustrate an example of a second conductor in FIG. 1;
4 is a view showing an installation example of a particulate matter reduction system for an exhaust gas according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a particulate matter reduction system according to the present invention will be described in detail with reference to the drawings.

It is to be understood, however, that the scope of the present invention is not limited to the embodiments described below, and those skilled in the art of the present invention, other than the scope of the present invention, It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

In addition, the terms used below are selected for convenience of explanation. Therefore, the technical meaning of the present invention should not be limited to the prior meaning, but should be properly interpreted in accordance with the technical idea of the present invention.

FIG. 1 is a view showing an embodiment of a particulate matter reduction system of an exhaust gas according to the present invention, and FIGS. 2 and 3 are views showing an example of a second conductor in FIG.

1 and 2, a particulate matter reduction system 100 for an exhaust gas according to the present embodiment includes first and second conductors 110 and 120, an insulator 130, and a voltage application unit 140.

The first conductor 110 is provided with a tube through which the gas stream flows.

The first conductor 110 is connected to a ground power source and is made of an electrically conductive material.

The first conductor 110 may be used as it is, such as an automobile or a semiconductor process, as it is, or may be provided with a separate piping so as to be connected to the exhaust gas piping.

The second conductor 120 is a structure disposed within the first conductor 110 and having an emitter 150 that is in contact with the gas stream and produces a low temperature plasma (NTP).

To generate the low temperature plasma (NTP), a voltage having a set voltage difference with a voltage applied to the first conductor 110 is applied to the second conductor 120.

Here, the voltage applied to the second conductor 120 needs to be continuously applied with a DC voltage of a predetermined magnitude. On the other hand, in the case of automobile exhaust gas, it is preferable that a DC voltage of -30 kV to -80 kV is applied constantly.

Meanwhile, an insulator 130 for electrically separating the second conductor 120 from the first conductor 110 is provided for generating a low-temperature plasma (NTP) due to a voltage difference between the first and second conductors 110 and 120 do.

The insulator 130 is made of an electrically insulating material, and examples thereof include ceramics. This can prevent the accumulation of particulate matter (PM) or its decomposition products on the surface thereof by using the surface roughness.

On the other hand, when a ceramic material having a dielectric capacity is provided, it is possible to oxidize and remove particulate matter (PM) or its decomposition products on the surface thereof. In this case, it is necessary to adjust the thickness of the insulator 130 to be relatively thin for oxidation.

On the other hand, in the present embodiment, the voltage applying unit 140 controls the DC voltage of the second conductor 120 to be applied continuously.

The voltage application unit 140 includes a system control unit 141 for controlling the connection of the power supply between the particulate matter reduction system 100 of the exhaust gas according to the present embodiment and the apparatus in which the particulate matter reduction system 100 is installed, To a voltage required by the particulate matter reduction system 100 of the exhaust gas according to the present embodiment.

Specifically, for example, the system control section 141 has a control function that has a function of turning on / off the system in accordance with the running state of the vehicle and simultaneously monitoring the state of the high-pressure device section. And to display an abnormal state by a flashing LED when it occurs. In this case, the power supplied to the transforming unit 143 is cut off from the RL so that no other dangerous situation occurs.

 On the other hand, by using a separate device, the system operation status is displayed on the user display in a normal operation ON LED, and in a blinking state when an error occurs.

The transformer 143 is a device for converting to high pressure. It uses a multi-stage rectification system to minimize the occurrence of arcing which reduces ripple and stabilizes the system efficiency due to a stable high pressure, Keep it in a constant state.

Meanwhile, in the present embodiment, the second conductor 120 includes the vertical rod 121, the horizontal rod 123, and the emitter 150.

The vertical rod 121 and the horizontal rod 123 are provided as a conductor integrally connected to each other, and the central portion thereof is bent.

The vertical rod 121 is arranged in the radial direction of the first conductor 110.

The vertical rod 121 is disposed radially through the first conductor 110. One end and the other end of the first conductor 110 are disposed inside and outside the first conductor 110, A rod 123 is disposed.

The exposed portion of the first conductor 110 is electrically connected to the transformer 143.

The horizontal rod 123 is arranged to extend in the direction parallel to the flow direction of the gas stream at the end of the vertical rod 121.

Here, the horizontal rod 123 is disposed at the center of the first conductor 110. It is desirable to be located exactly in the center for effective removal of particulate matter.

The emitter 150 is provided at the end of the horizontal rod 123 and has a plurality of protrusions 150a having apexes on its outer surface.

The emitter 150 is disposed in the same orientation as the horizontal rod 123 and is preferably located exactly in the center within the first conductor 110 for effective removal of particulate matter.

Next, in the present embodiment, the insulator 130 is provided as an electrically insulating material and surrounds the vertical rod 121. So that the vertical rods 121 are not electrically connected to each other in a state where they pass through the first conductor 110.

Specifically, one end of the insulator 130 is disposed inside the first conductor 110, and the other end is disposed outside the first conductor 110 to electrically isolate the second conductor 120 from the first conductor 110. [ do.

A horizontal rod 123 is inserted into one end of the insulator 130 disposed inside the first conductor 110 so that the first conductor 110 and the second conductor 120 are coupled with each other. It is preferable to have a loosely fitting engagement groove 131.

Since the bending portion of the second conductor 120, that is, the portion where the horizontal rod 123 and the vertical rod 121 meet, is engaged with the coupling groove 131, the second conductor 120 to the insulator 130 ) Is not changed. Accordingly, the second conductor 120 can be disposed in the central portion of the first conductor 110 in a direction parallel to the gas stream without any operation.

Since the insulator 130 and the second conductor 120 can be fixed together with the arc preventing member 160 to be described later, the coupling groove 131 can be separately formed between the insulator 130 and the second conductor 120 There is no need to place the adhesive. Therefore, the assembling convenience is improved.

Next, the arc preventing member 160 is made of a material having non-discharge corrosive non-eroding and is provided so as to cover one end of the insulator 130 disposed inside the first conductor 110 do.

At this time, the arc preventing member 160 is attached to the horizontal rod 123.

The connection between the arc preventive member 160 and the insulator 130 is formed by connecting a screw member 170 coupled with the end of the second conductor 120 to the outside of the first conductor 110 Electrode). Thus, there is no need for additional construction for the arc-preventing member 160 and the insulator 130 joint.

Meanwhile, in the present embodiment, the emitter 150 is located at the center of the inner portion of the first conductor 110, and the horizontal rod 123 is disposed extending from the vertical rod 121 in the direction toward the upstream of the gas stream .

That is, the emitter 150 is disposed to face the gas stream.

In this embodiment, the insulator 130 is provided in a shape such that the horizontal cross-sectional area of the insulator 130 decreases in a direction from the wall surface of the first conductor 110 to the horizontal rod 123 in the first conductor 110.

Further, in the present embodiment, it is preferable that negative power is applied to the second conductor 120 to generate low temperature plasma (NTP).

4 is a view showing an example of installation of a particulate matter reduction system of the exhaust gas according to the present invention.

Referring to FIG. 4, the particulate matter reduction system 100 of the exhaust gas according to the present embodiment may be arranged in series in series along the exhaust gas discharge path.

It is therefore a natural conclusion that the efficiency of removing particulate matter from the exhaust gas is greatly improved.

Claims (9)

A first conductor provided with a gas stream flowing therein and connected to a ground power source;
A second conductor disposed within said first conductor, said second conductor having an emitter in contact with said gas stream and producing a low temperature plasma (NTP); And
And an insulator electrically isolating the second conductor from the first conductor,
And a DC voltage of a predetermined magnitude is continuously applied to the second conductor.
The second conductor comprising: a vertical rod disposed radially of the first conductor; a horizontal rod extending in a direction parallel to the flow direction of the gas stream at an end of the vertical rod; And an emitter provided at a distal end of the horizontal rod and having a plurality of protrusions having apexes on the outer surface,
The insulator is electrically insulated and is provided to surround the vertical rod. One end of the insulator is disposed inside the first conductor, and the other end is disposed outside the first conductor, And a coupling groove in which the horizontal rod is inserted is formed at one end disposed inside the first conductor so as to be electrically separated from the first conductor and the coupled state of the first conductor and the second conductor is kept constant. and,
An arc preventing member provided to cover one end of the insulator and disposed inside the first conductor, the arc preventing member being connected to the horizontal rod and made of non-discharge corrosive material; ≪ / RTI &
Wherein the emitter is located at an inner center of the first conductor,
Characterized in that the horizontal rod is arranged extending from the vertical rod in a direction toward the upstream of the gas stream,
Wherein the direct current voltage applied to the second conductor is continuously applied with a selected value within a range of -30 kV to -80 kV. delete delete delete delete The method according to claim 1,
Wherein the insulator is provided in a shape such that a horizontal cross-sectional area thereof is reduced in a direction from the wall surface of the first conductor to the horizontal rod inside the first conductor. The method according to claim 1,
Wherein the second conductor is powered by a negative electrode. delete The method according to claim 1,
Characterized in that the second conductors are arranged in a plurality along the longitudinal direction of the first conductor, each of the second conductors being electrically insulated from the first conductor and having an emitter producing a low temperature plasma (NTP) Material abatement system.

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