WO2022173094A1 - Rotary bulk plasma generator - Google Patents

Abstract

An atmospheric pressure rotary bulk plasma generator comprises: a rotary plasma generator; an axial fan or a blower fan for introducing indoor air; a swirl guide plate for swirling air introduced by means of the axial fan or the blower fan and allowing same to be incident; a voltage electrode which generates rotating plasma and has a conic spiral wire structure; a fixing unit for fixing the voltage electrode; and a cylindrical ground electrode facing the conic spiral wire voltage electrode, and includes a structure, in which the conic spiral wire power electrode and the cylindrical ground electrode facing same are provided so that the distance (d) therebetween is within 3-10 mm and the conic spiral wire electrode, which is a voltage electrode, has a diameter gradually reducing in the direction in which plasma is discharged.

Description

Rotary Bulk Plasma Generator

The present invention relates to a rotary bulk plasma generator for sterilizing or removing various odor-causing bacteria and highly pathogenic viruses such as avian influenza and influenza floating in the atmosphere, and more particularly, to a plasma in the space between a voltage electrode and a ground electrode under atmospheric pressure. By generating and rotating the generated plasma, most of the air to be sterilized is passed through the plasma generating area, thereby sterilizing floating or fixed highly pathogenic viruses or bacteria such as avian influenza that occur in homes, offices, multi-use facilities, and livestock farms. Or sterilize, remove pollutants and odors such as ammonia from the living environment or animals, or sterilize or sterilize various types of garbage odors generated in urban garbage yards and various airborne or fixed bacteria generated from these garbage. It relates to a rotary bulk plasma generator under atmospheric pressure. In addition, it maximizes the amount of plasma generation through the bulk plasma generator and at the same time generates a large amount of reactive active substances (ROS: Reactive Oxygen Species, RNS: Reactive Nitrogen Species, RONS: Reactive Oxy-nitrogen Species), thereby providing a qualitative effect of air cleaning. It also relates to a device that can increase it.

In the modern society, where environmental problems are becoming more serious as income levels rise, the demand for livestock animals such as chickens and ducks is rapidly increasing. Despite the fact that it is causing serious damage to and the national economy, a clear solution has not been prepared. In addition, as urban life becomes more complex and the amount of waste generated increases by thousands of tons every year, we are gradually facing the limits of waste disposal and convenience of life. In spite of the fact that various odors and the occurrence of various viruses and bacteria in garbage yards where garbage is collected in one place for this purpose, countermeasures are insufficient.

In particular, in recent years, the pandemic of the novel coronavirus has seriously threatened the health of the people, resulting in a crisis situation that makes it difficult to maintain the normal economy of the country.

Effectively sterilizes or sterilizes various viruses and bacteria that exist throughout the living environment, such as around houses and offices, so that people can lead a healthy life while supporting the effective implementation of national quarantine, which has taken a more important economic and social position. The demand for air purifiers that can do this is also increasing explosively.

In general, plasma generating devices are widely used in devices that purify air through sterilization or sterilization (hereinafter referred to as 'sterilization'). It is a device that removes highly pathogenic bacteria, viruses, and odor-causing bacteria that exist in the air by introducing

The most important factor in determining the efficiency of an air purifier in which such plasma is used is how to bulk (bulk) the plasma under various limited conditions (such as a fixed voltage, current, and size limitation of the purifier according to a limited installation location) and atmospheric pressure. ) to maximize the contact with the inlet air.

A rotating plasma method has recently emerged as an efficient means of solving the above problems, and according to research so far, it is known that there are three main methods of generating a rotating plasma by electric discharge.

First, when a magnetic field is applied around an electric discharge, electrons or ions rotate according to Faraday's law to generate plasma. Representatively, H. Zhang, F. Zhu, X. Li and C. Du in 2017 ["Dynamic behavior of a rotating gliding arc plasma in nitrogen: effects of gas flow rate and operating current", Plasma Science and Technology, Vol.19, No.4 (2017).] It is a device that rotates the gliding arc using the principle that electrons and ions rotate according to Faraday's law when a magnetic field is applied by placing a magnet or a magnet coil around the barrel, which is the ground electrode. Looking at the top view in FIG. 1, it can be seen that the arc discharge is rotating in a clockwise direction.

The second method is to swirl (vortex, turbulence, vortex, spiral) the motion of the incoming gas by hydrodynamic rotation instead of using a magnetic field. That is, when the inflow gas is introduced around the interface of the plasma generator, the gas flowing through the interface naturally rotates, and if there is a hole, it rotates by the pressure difference and is discharged through the hole. Because of this, I naturally do the swirl exercise. However, in order to enable such a natural swirl motion, since the plasma must be rotated only by the force of the gas flow, the volume of the region where the plasma is discharged must be very small, but the velocity or flow rate of the incoming gas must be very large.

This fact was confirmed in 2016 by G. Trenchev, St. Kolev, A. ["3D model of a reverse vortex flow gliding arc reactor, Plasma sources science and technology / Institute of physics – ISSN 0963-0252-25(2016)"] is described in detail and clearly in the technical paper published by Bogaerts. . As described above in (1) of FIG. 2, when gas is introduced by installing one to four gas inlet passages in the tangential direction of the barrel, the inflow gas performs a swirl motion. At this time, the inflow gas performing a swirl motion is the result of simulating the velocity of each position, (2) of FIG. 2 is the result of simulating the pressure by position of the inlet gas performing the swirl motion, and (3) of FIG. 2 is the simulation of the gas temperature of the plasma generated at this time. As a result, it is shown to have a temperature of at least 1000K to 4000K. In particular, it was found through the simulation results that a very high high-temperature plasma would be formed with a maximum temperature of 4000K (3700℃) in the central part. As can be seen from (1) and (2) of FIG. 2, the gas velocity in the inflow passage is 30-40 m/s and the gas pressure is about 1.16x10 ⁵ Pa (1.13 atmospheres), so the inflow gas has a very high velocity. It is also known that they have

As can be seen from the data shown above, the result is that, in order to supply the inlet gas to generate the swirl phenomenon, a high-pressure gas supply or a separate pressurization device such as a compressor is absolutely necessary, and the part where the inlet gas is discharged is at a very high temperature. This means that a separate cooling device or a device for absorbing heat is required because it has The plasma shown in is an arc plasma obtained by supplying a high pressure, high speed, and large flow rate of gas, thereby forming a high temperature plasma with a very high temperature as shown in (3) of FIG. It also has a disadvantage that it cannot be used at all in places that require plasma.

Meanwhile, in 2017, ["Revealing the arc dynamics in a gliding arc plasmatron: a better insight to improve CO2 conversion", Plasma sources science published by R. Marleen, M. Jose, T. Georgi, G. Fausto and B. Annemie and technology / Institute of physics [London]-ISSN0963-0252-26:12 (2017)] The fact that arc plasma is rotated was also announced in the technical paper (see Fig. 3). According to this, the rotating arc plasma is the velocity of the incoming gas. It is explained that turbulence is generated by this and the flow rate reaches a certain level, and vortices are formed by this turbulence, and the arc shape and length change according to this vortex and rotate.

Third, in 2007, D.H. Lee, K.-T. Kim, M.S. Cha and Y.-H. Song published ["Optimization scheme of a rotating gliding arc reactor for partial oxidation of methane", Proceeding of the Combustion Institute, Vol.31, Issue 2, p. 3343-3351.] In the technical paper, when methane gas, nitrogen and oxygen gas are input to the swirl generator located at the bottom of the electrode structure in the electrode structure as shown in FIG. When a DC high voltage is applied between the conical power electrode and the central part, an electric discharge is formed between these electrodes, and the arc plasma is generated by the swirl motion by the swirling motion, as in FIGS. It has been reported that rotating plasmas occur.

As another example, US Patent US5405514 discloses that when a swirling gas is supplied, atmospheric pressure plasma is generated between two electrodes spaced apart by a distance of 3 mm or more. One to four supply lines for supplying gas were installed so that the gas was automatically swirled by the pressure of the supplied gas. It is disclosed that a glow discharge is formed between the two electrodes when a high voltage DC power is applied to the electrode (refer to FIG. 5), but a specific rationale for the cause of the rotation is not presented.

Also, referring to US Patent US009834442, although the electrode structure and the plasma generation method are different, as in the US Patent US5405514, when the reaction gas is introduced in a tangential direction to the barrel, the introduced reaction gas is swirled. At this time, it is stated that 1 to 4 gas inlet passages can be installed in the tangential direction.

In addition, in WO2010/005201 International Patent Publication No. WO2010/005201, one to four supply lines having a swirl structure are provided, and the power electrode has a cone shape to generate arc plasma between the ground electrode and the power electrode, which is a barrel. It is described that the scrubbing efficiency is increased by increasing the contact efficiency with water.

Republic of Korea Patent 10-0522167 also has a swirl structure and introduces a reaction gas into this structure to induce a plasma reaction using a high voltage difference, and the reaction raw material rotates and flows by the swirl structure to initiate a reaction at a high temperature within a few seconds. Plasma reaction that also increases the use efficiency compared to the supply of heat energy without a gas phase change device by installing a heat exchange means and a fluid supply path alone or in parallel on the inner wall of the reactor induced at a high temperature to change the liquid raw material into a gas phase and introduce it into the reaction device was introduced. In this patent, when the inlet gas is rotated, there is no clear explanation of the mechanism by which the generated plasma is rotated, and it simply rotates and flows to initiate a high-temperature reaction within a few seconds.

In addition, Korean Patent 10-0822860 has an electrode structure similar to that of Korean Patent 10-0522167, but a method of swirling the reactor inner wall, which is a ground electrode, in a spiral structure, and a structure for supplying a reaction gas supply pipe inside the reactor. A plasma reactor is disclosed. In other words, a method for maximizing the effect of treating a difficult-to-decompose gas by increasing the rotational flow effect by having a spiral structure inside the reactor increases the time during which the mixed gas is exposed to the plasma was introduced.

In addition, Korean Patent Application Laid-Open No. 10-2015-0054281 is a patent that changes the electrode structure or reactor structure described in Korean Patent No. 10-0522167 introduced above, and the purpose of the development is ultimately the inner wall of the plenum chamber and the ground cylinder for rotatingly supplying discharge gas. A plasma burner having an electrode nozzle that generates a rotating arc with a rotating discharge gas by an applied voltage by forming a discharge gap between the electrodes and supplies fuel to the rotating arc to form a flame was introduced. This patent also states that the rotating arc is generated when the discharge gas is supplied in rotation without any explanation of the mechanism by which the rotating arc is generated.

In the above-introduced patents, Korean Patent 10-0522167 and Korean Patent No. 10-0822860, in the same manner as described in US Patents US5405514 and US009834442, a structure for swirling the supplied gas by supplying gas in a tangential direction, described in the same way.

As such, most of the patents mentioned above have a swirl motion when gas is supplied to a gas supply unit having a swirl structure, and when a high voltage is applied between the two electrodes, the plasma formed by the discharge rotates by the swirl motion. The purpose was to increase the processing efficiency by increasing the contact time of the plasma with other gases or fluids to be treated, and the rotating plasmas they generate are all high-temperature plasmas.

However, in the devices shown in these technical papers or patent documents, the speed or flow rate of the inflow gas must be very high to generate the swirl motion as described above. Supply or a separate pressurization device such as a compressor is absolutely necessary, and since the plasma formed at this time is a high-temperature plasma having a very high temperature, the plasma discharge portion also has a very high temperature, and for this reason, the plasma according to the above-mentioned prior art All of the generators have a problem in that a separate cooling device or a device for absorbing heat as shown in Korean Patent 10-0522167 is required.

In addition, the plasma generated in the above-mentioned prior art is mostly arc plasma generated by the high-speed gas supply, and due to this, a high-temperature plasma with a very high plasma temperature is formed (Plasma sources science and technology/Institute of physics - ISSN). 0963-0252-25 (2016), see FIG. 2(3)) There is a problem that it cannot be used at all without a separate cooling device in a place that requires plasma maintained at room temperature or at a low temperature of about 45° C. or less.

In addition, all of these patents have a feature that rotation plasma does not occur unless the inlet gas is incident in a tangential direction to the barrel for swirl motion. that it doesn't rotate.

And, in the above patents, there is no disclosure about a device that creates a swirl motion using pure air and discharges it to the outside of the air that has passed through the plasma. In the prior art, contact efficiency with the separately supplied fluid or gas is made by using a gas such as Ar or He that easily generates plasma, and supplying a separate fluid or gas to be treated in a swirl motion into the created high-temperature arc plasma. Since they were developed for the purpose of increasing the plasma treatment efficiency by increasing the temperature, they cannot use air as a plasma generating gas. If they use air as a plasma gas, the mechanism for generating plasma is completely different.

In general, air is not a single gas, but a mixed gas in which N ₂ , O ₂ , Ar, CO ₂ , NO ₂ , CHCOOH, CH ₄ , etc. are mixed together. Because the discharge phenomenon caused by each gas is completely different, a uniform discharge is formed. Because it has a problem that is very difficult to do.

Currently, there are four widely known technologies that have been adopted for air sterilization and odor removal on the market. The first is a method using an ultraviolet (UV-C) lamp, the second is a photocatalytic method using the ultraviolet light of an ultraviolet (UV-C) lamp, the third is a method using low-temperature DBD (Dielectric Barrier Discharge) plasma, and the fourth is atmospheric pressure real plasma. In order to effectively sterilize places with large spaces such as school classrooms, libraries, airports or railway waiting rooms, large cafeterias, and hotel restaurants, these methods have a decisive disadvantage that several purifiers must be installed in each necessary place. .

The present invention supplements the disadvantages of the conventional rotating plasma generator as described above, and sterilizes and removes contaminants or various bacteria or viruses existing in living spaces such as homes or offices, while maximizing sterilization efficiency, or in livestock farms. Removal of various odors emitted when raising various types of animals, especially chickens and ducks, various bacteria that infect and spread to these bodies, or various filth odors generated in urban garbage yards and various germs generated in these yards It is to provide an atmospheric pressure rotary bulk plasma generator that sucks air to generate a rotary plasma only with the sucked air in order to be able to do so.

In addition, the present invention is harmless to the human body by developing a plasma generating device close to 0.00ppm of ozone generation (measured at a point spaced 200mm from the outlet using a plastic tube: 0.0002ppm, ECO SENSOR Inc. A-21ZX, USA), An object of the present invention is to provide an atmospheric pressure rotating bulk plasma apparatus that is effective for sterilization or sterilization of various highly pathogenic viruses or bacteria present in the air, and is effective for removing pollutants and odors.

In addition, in the conventional rotating bulk plasma apparatus, the amount or density of plasma is insufficient to generate an amount that can be used in a large space, so there is no need for a separate pressurization apparatus and under atmospheric pressure by improving the problems that are difficult to enlarge or structure the clean system. An object of the present invention is to provide a rotary type bulk plasma generator capable of generating low-temperature plasma and capable of sterilizing a large amount per unit time.

In order to achieve the above object, an atmospheric pressure rotating bulk plasma generating apparatus according to an embodiment of the present invention includes a rotating plasma generating unit; and an axial fan or blower fan that introduces air into the room, a swirl guide plate that swirls the air introduced by the fan to enter it, and a conic spiral wire that generates the rotating plasma A voltage electrode having a (conical spiral) structure, a fixing part for fixing the voltage electrode, and a cylindrical grounding electrode facing the conic spiral wire voltage electrode, wherein the distance between the conic spiral wire power electrode and the opposing cylindrical grounding electrode (d) ) is installed to be within 3~10mm, and the voltage electrode, the Conic Spiral Wire electrode, has a structure in which the diameter is gradually reduced in the direction in which the plasma is discharged.

In this way, the plasma volume was remarkably increased by naturally generating a rotating plasma by the conic spiral wire structure between the voltage electrode of the conic spiral wire structure and the cylindrical ground electrode, and also the incoming air was discharged in a method different from the above patents or technical papers. In addition to supplying the inflow air through the swirl guide plate that swirls, even if laminar flow occurs through the swirl guide plate, the voltage electrode itself has a conic spiral wire structure, so a rotating plasma is naturally formed, and As the contact time between the air and the rotating plasma is prolonged, various highly pathogenic viruses and bacteria present in the inlet air can be sterilized and sterilized faster and more efficiently, and various odors and chemical components present in the inlet air are also removed more quickly and efficiently. The advantage is that it is possible to Atmospheric pressure rotating bulk plasma generated by the present invention is a low-temperature glow plasma having arc transition glow discharge characteristics, not high-temperature plasma, unlike the several US and Korean patents, so it does not need to absorb heat or cool, and there is no need for a separate pressurization device. There is no need to make high-pressure and high-speed inflow gas by using a simple swirl guide plate to swirl the inflow gas in the air state.

According to the present invention, contaminants in the air in the home or office remove or sterilize various bacteria or viruses, or various odors and air emitted when raising various kinds of animals raised in livestock farms, especially animals such as chickens and ducks. Various highly pathogenic viruses or bacteria that infect and spread to these bodies through At the same time as the removal, it is possible to efficiently remove various bacteria remaining in the indoor air.

In addition, according to the present invention, the rotational discharge generated between the voltage electrode and the cylindrical ground electrode using a swirl guide plate that swirls the inlet air and a voltage electrode of a conic spiral structure is converted into a glow discharge with a wide bandwidth and is generated by atmospheric pressure rotation bulk. Hydrogen denaturation in highly pathogenic virus cells by reactive active species (OH: Hydroxyl Radical, ROS: Reactive Oxygen Species, RNS: Reactive Nitrogen Species, RONS: Reactive Oxy-Nitrogen Species) generated from plasma, DNA denaturation and rotational plasma The function of sterilization by electrical stress caused by charged particles generated by the electroporation, electroporation by the high electric field applied between the electrodes, and thermoporation by the local thermal energy generated by the rotating plasma, and also rotation with high energy Odors passing through the plasma region and chemical components can be efficiently removed through direct dissociation (dissociation, cracking) and conversion reaction into safe substances without odor by chemical reaction of the decomposed components.

In addition, if the rotary bulk plasma generator of the present invention is applied to the air cleaning device and a guide plate for swirling the air is provided together, the synergistic effect of the two devices makes it possible to increase the rotation speed and bulk when the rotary plasma is generated, Due to this, as the contact volume of the inlet air and plasma increases, a large amount of sterilization processing is possible per unit time in the purifier, so even with a purifier with a limited capacity, it is possible to dramatically expand the sterilization target area. It becomes possible to systematize or enlarge the air cleaning apparatus which is not limited to an area|region.

1 is a conceptual diagram showing a method of rotating atmospheric pressure plasma using a magnetic field according to the prior art shown in [Plasma Science and Technology, Vol19, No4 (2017)].

2 is a representative conceptual diagram and simulation result data of swirling the inlet gas according to the prior art shown in [Plasma sources science and technology/Institute of physics - ISSN 0963-0252-25 (2016)].

3 is a prior art shown in [Plasma sources science and technology/Institute of physics [London]-ISSN0963-0252-26:12 (2017)] that the plasma generated in a rotating plasma reactor having a swirl structure is rotated by time measured data.

FIG. 4 is data in which arc plasma is rotated by a swirling gas as a prior art shown in [Proceeding of the Combustion Institute, Vol 31, Issue 2, p 3343-3351].

5 is a perspective view showing an electrode structure that rotates an arc plasma by a swirl motion as a prior art disclosed in [US Patent US00540514].

6 is a 3D view of the atmospheric pressure rotating plasma generator according to the present invention.

Figure 7 is a view showing a cross-sectional view of Figure 6 and the swirl guide plate (3) according to the present invention.

8 is a view showing the shape of the conic spiral wire voltage electrode of FIG. 7 according to the present invention.

9 is a conceptual diagram illustrating that the atmospheric pressure plasma 30 formed between the voltage electrode 7 and the ground electrode 6 of FIG. 7 is rotated and generated according to the present invention.

10 is a photograph of atmospheric pressure rotating bulk plasma generated according to the present invention. The incoming air wind speed is 5.7 m/s, and the discharge voltage is plasma generated at 15 kVpp. [The inflow wind speed was measured using an anemometer (PROVA INSTRUMENTS Inc. AVM-07 Flow Anemometer)]

11 is a photograph of rotating plasma at each wind speed when the incoming air wind speed is changed when the discharge voltage is 7.5 kVpp. [Wind speed: (1) 1.5 m/s, (2) 2.7 m/s, (3) 4.3 m/s, (4) 5.7 m/s]

12 is a photograph of rotating plasma at each discharge voltage when the discharge voltage is changed when the inflow air wind speed is 2.7 m/s. [Discharge voltage: (1) 1.3kVpp, (2) 3.41kVpp, (3) 4.74kVpp, (4) 15kVpp]

13 is a photograph of plasma rotation according to time when the inlet air wind speed is 27 m/s and the discharge voltage is 341 kV. [(1) 0.00 sec, (2) 0.44 sec (3) 0.100 sec, (4) 0.58 sec (5) 1.98 sec, (6) 3.22 sec]

14 is a photograph of measuring the trajectory of the formed rotating plasma when the inlet air wind speed is 2.7 m/s and the discharge voltage is 3.41 kV. [Plasma rotation direction: clockwise]

15 is a result of an ammonia reduction experiment in an actual office space (33m ³ ) using the atmospheric pressure rotating bulk plasma according to the present invention.

16 is a result of an experiment to reduce Total Volatile Organic Compounds (TVOC) and formaldehyde (HCHO) present in an actual office using the atmospheric pressure rotating bulk plasma according to the present invention.

The present invention in its best form, a plasma forming unit; a blowing fan for introducing air into the plasma forming unit through an air inlet; a vortex guide plate in the form of a plate for swirling the introduced air; and a conical spiral wire-shaped voltage electrode for generating plasma in the plasma forming unit and a barrel-type ground electrode facing the voltage electrode, wherein one end of the voltage electrode is fixed to the electrode fixing unit, The other end is coupled to a rivet-type electrode end,

The inclination angle (θ) of the blades formed on the vortex guide plate is less than or equal to the spiral angle of the voltage electrode, and the rotation direction of the introduced air is rotated in the same direction as the spiral direction of the voltage electrode. An atmospheric pressure rotary bulk plasma generator is provided.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even though they are indicated in different drawings. Also, in the description of the present embodiment, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present embodiment, the detailed description thereof will be omitted.

It will be understood that the operating method shown in the present invention has various embodiments as described below and can be implemented in a modified form without departing from the essential characteristics of the description. Therefore, the methods disclosed below should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the detailed description of the invention, and all differences within the scope of equivalents thereto should be construed as being included in the scope of the present invention.

Hereinafter, an atmospheric pressure rotary bulk plasma generator according to an embodiment of the present invention will be described with reference to the accompanying drawings.

6, 7, 8 and 9, the atmospheric pressure rotation type bulk plasma generator 100 according to an embodiment of the present invention is largely a plasma forming unit 50, AC high voltage having a frequency of 25 kHz. It has a configuration including a power supply 10 , a blower fan 1 for supplying air to the plasma forming unit 50 , a swirl guide plate 3 for swirling the introduced air, and a ground electrode 6 . The electrode part for generating plasma consists of a voltage electrode 7 having a conic spiral wire structure and a ground electrode 6 having a barrel shape. The blowing fan 1 and the ground electrode 6 for introducing air are located on the same central axis, have parallel air passages, and the swirl guide plate 3 for swirling the incoming air is a plate with blades. It is fixed to the outer housing and serves to rotate the air introduced from the fan in the same rotational direction as the voltage electrode (7). It allows the rotation angle of the to be kept constant, and it is desirable to set the value to about 15 to 20 degrees through an experiment.

Specifically, the atmospheric pressure rotating bulk plasma generating apparatus according to an embodiment of the present invention includes an electrode fixing unit 5 connected to an AC high voltage power supply 10 , a plasma voltage electrode 7 , and a plasma opposite to the plasma voltage electrode 7 . An insulator 8 for insulation is provided between the ground electrode 6 , the electrode fixing part 5 and the ground electrode 6 . That is, the generator according to an embodiment of the present invention has a voltage electrode 7 having a conic spiral structure inside the plasma ground electrode 6 having a barrel-type structure, and a through-type air flow path flowing in from the blower fan 1 is provided. is provided A swirl guide plate (3, blade angle θ = 15 to 20 degrees) for swirling the incoming air is installed between the blowing fan and the plasma forming unit 50 . At this time, the ground electrode 6 of the barrel has an outlet 40 through which the air 15 introduced from the air inlet 20 is discharged through the air flow path.

In addition, the generator according to an embodiment of the present invention is mounted on at least one end of the blowing fan 1 (axial flow fan, blower fan), the inlet 20 and the outlet 40 disposed adjacent to the inlet 20 . It may further include a foreign matter removal filter.

At atmospheric pressure, when power is applied to the voltage electrode 7 having a conic spiral wire structure from the AC high voltage power supply 10 through the electrode fixing part 5, the space between the voltage electrode 7 and the ground electrode 6 A plasma discharge is generated in the phosphor-plasma forming unit 50 , and the generated discharge is a deformed gliding arc discharge that moves in the direction of the discharge port 40 by the introduced air. In the plasma discharge formed at this time, rotational plasma is generated by the shape of the ground electrode, and the air 15 introduced by the blowing fan 1 is swirled by the swirl guide plate having an incident angle θ of 15 to 20 degrees. The rotation is strengthened by the inflow.

As described above, the principle of generating the rotating bulk plasma 30 is that the introduced air is swirled by the swirl guide plate 3, as well as the voltage electrode 7 is swirled and rotated in the same direction as the incoming air. This is because it has a spiral wire structure. That is, the ground electrode 6 and the voltage electrode 7 have a Conic Spiral Wire structure that rotates clockwise with a gap d of 3 - 10 mm, so that the plasma formed between these electrodes also rotates clockwise. will be.

This principle is shown in detail in FIGS. 8 and 9 . Referring to FIG. 8 , it can be seen that the AC high voltage power supply 10 is connected to the electrode fixing unit 5 , and the voltage electrode 7 has a clockwise conic spiral wire structure. In addition, the gap d between the voltage electrode 7 and the barrel ground electrode 6 having a conic spiral wire structure is a conic spiral structure in which the gap d gradually increases toward the ground electrode outlet 40 .

In the plasma generating unit 100 according to an embodiment of the present invention, the rotating plasma formed by the discharge plasma rotating between the voltage electrode 7 and the barrel ground electrode 6 having a conic spiral wire structure as shown in FIG. 9 is generated. Since 30 is formed, the probability that most of the air directly supplied by the blowing fan 1 comes into contact with the formed rotating plasma 30 increases, so that a relatively bulky bulk-type plasma is generated, resulting in a large amount of air Plasma treatment of the introduced air is possible even if it passes through, and the sterilization efficiency (sterilization rate) for airborne bacteria is maximized.

The power applied to the conic spiral wire voltage electrode 7 is preferably high-frequency, high-voltage AC power. To this end, the AC power supply 10 may include an inverter. However, embodiments of the present invention are not limited thereto.

As shown in FIG. 7 , the air 15 introduced into the atmospheric pressure rotating bulk plasma apparatus along the arrow direction is the blowing fan 1 , the inlet 20 and the swirl guide plate having an incident angle θ of 15 to 20 degrees. It flows into the plasma generating unit 100 through (3). The introduced air is swirled and moved through the air flow path, and highly pathogenic viruses or bacteria in the air can be sterilized or sterilized by the generated atmospheric pressure rotating bulk plasma 30 , and contaminants and odors can be removed.

Specifically, as mentioned above, among the characteristics of atmospheric pressure rotating bulk plasma, Electroporation by a strong electric field or discharge of plasma, Electric Stress by charged particles of plasma, and UV Radiation formed by plasma and It is sterilized or sterilized by denaturing DNA in the cells of viruses or bacteria by Chemical Damage caused by reactive active species (OH, ROS, RNS, RONS), etc. and Thermoporation by locally generated heat.

In the plasma generating unit 100 according to an embodiment of the present invention, the plasma 30 is emitted at an average temperature of 38 to 46 degrees, and corona discharge (dielectric barrier discharge) using a reactive gas such as argon, helium, nitrogen, etc. Unlike , it generates an arc-to-glow-transition discharge that is generated using only air.

In addition, in order to increase the amount of glow plasma discharged to the outside, as shown in FIG. 7 , a rivet-type electrode end 9 is coupled to the other end of the voltage electrode 7 . The length (L) between the ends of the outlet is the power of the AC high voltage power supply 6 applied to the voltage electrode 7 and the wind speed (air volume) of the incoming air, and the distance between the voltage electrode 7 and the ground electrode 6 . However, according to the experiment, it is known that about 15 - 25mm is the most preferable.

And as shown in FIG. 8, the reason for making the end of the rivet-type electrode end 9 forming one end of the voltage electrode 7 round is that the rotating arc plasma has reached the end of the voltage electrode 7 by the wind speed. This is because, if the tip is not treated with "R (round)", the "Arc to Glow Transition" effect desired in the present invention is significantly reduced, and the transition to the glow discharge is significantly lowered, and ozone generation may become serious. At this time, it was experimentally confirmed that the radius of curvature of the round part 9 should have a size of about 40 - 60% of the diameter of the ground electrode discharge port 40 to minimize arc discharge and maximize glow discharge.

10 is a photograph taken from the side and front of the atmospheric pressure rotating bulk plasma generated by the atmospheric pressure rotating bulk plasma generating unit 100 according to an embodiment of the present invention. The discharge voltage is 15 kVpp, and the inflow wind speed is 5.7 m/s.

For example, as shown in FIG. 10 , the degree of generation of the atmospheric pressure rotating bulk plasma 30 according to an embodiment of the present invention is proportional to the power of the AC high voltage power supply 1 applied thereto. In general, the total length of the atmospheric pressure plasma is proportional to the current value of the AC high voltage power supply 1 applied. In addition, the rotational speed of the rotating bulk plasma cannot be accurately measured, but the rotational direction and approximate rotational trajectory can be measured. That is, the rotation direction of the plasma coincides with the spiral turn direction of the swirl guide plate 3 having an incident angle θ of 15 degrees and the voltage electrode 7 having a conic spiral wire structure made to rotate in the same direction as the guide plate. That is, it is expected to be proportional to the number of spiral turns of the voltage electrode 7 in the ground electrode 6 of the barrel structure having a constant length. Therefore, theoretically, the rotational speed of the rotating plasma 30 should be designed in consideration of the applied power of the AC high voltage power supply 10, the rotational speed of the incoming swirl air, and the spiral turn of the voltage electrode 7 .

11 is an experimental result of how the plasma is changed according to the wind speed of the blowing fan that is introduced when the atmospheric pressure rotating bulk plasma according to the present invention has a discharge voltage of 7.5 kppV. That is, as the wind speed increases from (1) 1.5 m/s to (4) 5.7 m/s, it can be seen that the amount of plasma generated increases as shown in the photograph of FIG. 11 .

In addition, Figure 12 is an experimental result of how the plasma is changed according to the applied discharge voltage when the atmospheric pressure rotating bulk plasma according to the present invention has a wind speed of 2.7 m/s. That is, as the applied voltage increased from (1) 1.37 kVpp to (4) 7.5 kVpp, the amount of plasma generated increased as can be seen from the experimental results photos.

Also, as can be seen from the results of FIGS. 11 and 12 , the number of rotations of the plasma generated is the same except for the initial discharge position, and the discharge trajectory is uniform.

13 is a continuous shot in Slow Motion to find out which direction the plasma rotates when the atmospheric pressure rotating bulk plasma according to the present invention is introduced at a constant wind speed of 2.7 m/s and the discharge voltage is 3.41 kVpp. is the result shown. As can be seen from FIG. 13 , it can be seen that the plasma rotates in a clockwise direction.

FIG. 14 is an experimental result of analyzing the rotational trajectory of the generated atmospheric pressure rotating bulk plasma, illustrating the phenomenon shown in FIG. 13 in more detail. The left photo of FIG. 14 shows the discharge start point and the trajectory drawn while the plasma rotates, and the dotted line in the right photo shows the trajectory that appears when all of these dotted lines are connected. The rotational direction of the generated plasma clearly indicates that the swirl is rotated clockwise in the same way as the rotational direction of the incoming air and the rotational direction of the voltage electrode 7 . In addition, in general, if the wind speed of the swirl incident air is high, it can be expected that the rotational trajectory is different. .

In order to examine the performance and efficacy of the atmospheric pressure rotating bulk plasma according to the present invention, a test for highly pathogenic floating influenza and corona virus suspended in the air was conducted at the Korea Research Institute of Chemical Technology (KRICT), and the results are shown in Tables 1 and 2. .

Table 1 shows the results of a sterilization test of highly pathogenic influenza-borne viruses using atmospheric pressure rotating bulk plasma according to the present invention. As can be seen in Table 1, it was found that wet influenza virus was sterilized by 68.824% at 15-minute exposure, at least 99.999% at 30-minute exposure, and at dry influenza virus at 99.197% at 15-minute exposure and at least 99.999% at 30-minute exposure.

Influenza virus (FluA, Human H3N2)

Sample		Virus		Virus Reduction (Log)			Virus Reduction (%)
Name	Switch	Name		Type	0 min	15 min	30 min	0 min	15 min	30 min
Atmospheric Bulk Plasma Device	OFF	FluA	Liquid	< 0.00	< 0.00	< 0.00	0%	0%	0%
	ON			< 0.00	0.51	> 6.53	0%	68.824	> 99.999
Atmospheric Bulk Plasma Device	OFF		Dry	< 0.00	< 0.00	< 0.00	0%	0	0
	ON			< 0.00	2.10	> 6.08	0%	99.197	> 99.999
When 48-W pltae containing virus in liquid or dry form was put in an airtight box and the bulk plasma generator was operated, a decrease in virus was observed after 15 minutes, unlike the control placed outside the sealed box, and after 30 minutes, liquid and dry All viruses were observed to be reduced to an undetectable level (log value >6.0).

Table 2 shows the results of a sterilization test for highly pathogenic corona floating virus using the atmospheric pressure rotating bulk plasma according to the present invention. As can be seen in Table 2, it can be seen that wet corona virus sterilizes at least 88.496% at 15-minute exposure and at least 99.989% at 30-minute exposure, while dry coronavirus kills 99.206% at 15-minute exposure and over 99.986% at 30-minute exposure.

Coronavirus (Felin Coronvirus fCoV)

Sample		Virus		Virus Reduction (Log)			Virus Reduction (%)
Name	Switch	Name		Type	0 min	15 min	30 min	0 min	15 min	30 min
Atmospheric Bulk Plasma Device	OFF	fCoV	Liquid	< 0.00	< 0.00	< 0.00	0%	0%	0%
	ON			< 0.00	0.94	> 3.95	0%	88.496	> 99.989
Atmospheric Bulk Plasma Device	OFF		Dry	< 0.00	< 0.00	< 0.00	0%	0	0
	ON			< 0.00	2.10	> 3.85	0%	99.206	> 99.986
When 48-W pltae containing liquid or dry virus was put in an airtight box and the bulk plasma generator was operated, virus reduction was observed after 15 minutes, unlike the control placed outside the sealed box, and after 30 minutes, liquid and dry All viruses were observed to be reduced to an undetectable level (log value >60).

In addition, in order to examine the performance and efficacy of the atmospheric pressure rotating bulk plasma according to the present invention, sterilization tests of MRSA (superbacteria), pneumococcus, E. coli and Staphylococcus aureus, which are highly pathogenic fixed bacteria that are fixed indoors, were conducted by the Korea Construction and Life Testing Laboratory (KCL). ), and the results are shown in Table 3 (MRSA (superbacteria)), Table 4 (pneumococcus), Table 5 (E. coli) and Table 6 (Staphylococcus aureus).

Superbacteria (MRSA, Staphylococcus aureus Subsd, aureus)

Test Items		exam Way	Test result			test environment
			concentration before operation (CFU/m 3 )	Concentration after operation (CFU/m 3 )	decrease rate (%)
MRSA (ATCC 33591)	atmospheric pressure plasma module	Requester suggest	2.1x10 4	<10	99.9	(23±0.2)℃ (100.1±2.0)%RH
Chamber size: 8m 3 , Measuring equipment:MAS-100NT(MERCK), Measuring time: 3 hours

FKlebsiella pneumoniae

Test Items		exam Way	Test result			test environment
			concentration before operation (CFU/m 3 )	Concentration after operation (CFU/m 3 )	decrease rate (%)
pneumococcus (ATCC 4352)	atmospheric pressure plasma module	Requester suggest	2.1x10 4	<10	99.9	(23±0.2)℃ (100.1±2.0)%RH
Chamber size: 8m 3 , Measuring equipment:MAS-100NT(MERCK), Measuring time: 3 hours

Escherichia coli

Test Items		exam Way	Test result			test environment
			concentration before operation (CFU/m 3 )	Concentration after operation (CFU/m 3 )	decrease rate (%)
coli (ATCC 25922)	atmospheric pressure plasma module	Requester suggest	2.1x10 4	<10	99.9	(23±0.2)℃ (100.1±2.0)%RH
Chamber size: 8m 3 , Measuring equipment:MAS-100NT(MERCK), Measuring time: 3 hours

Staphylococcus aureus

Test Items		exam Way	Test result			test environment
			concentration before operation (CFU/m 3 )	Concentration after operation (CFU/m 3 )	decrease rate (%)
yellow Staphylococcus aureus (ATCC 6538)	atmospheric pressure plasma module	Requester suggest	2.1x10 4	<10	99.9	(23±0.2)℃ (100.1±2.0)%RH
Chamber size: 8m 3 , Measuring equipment:MAS-100NT(MERCK), Measuring time: 3 hours

In addition, in order to examine the performance and efficacy of the atmospheric pressure rotating bulk plasma according to the present invention, a direct experiment was conducted on the ammonia reduction performance present in the indoor atmosphere in an office having a space of 35 m ³ (about 10 pyeong), and the The results are shown in FIG. 15 . 13, when the initial ammonia concentration was injected at 26 ppm, the atmospheric pressure plasma device was operated while the atmospheric pressure plasma device was operated, while it naturally decreased to 17.9 ppm even after 3 hours (180 minutes) elapsed. was confirmed to be reduced to 0 ppm in 1.5 hours (90 minutes).

And, in order to examine the performance and efficacy of the atmospheric pressure rotating bulk plasma according to the present invention, total organic compounds (TVOC: Total Volatile Organic Compounds) and formaldehyde (HCHO, Formaldehyde), which are also five major harmful gases in the indoor atmosphere. The reduction performance of the same was conducted directly in the office having the same actual space of 35m ³ (about 10 pyeong), and the results are shown in FIG. 16 . The performance that can be seen in FIG. 16 (upper part of (1)] is that the initial TVOC in the office is up to 3100 ppm in the state where atmospheric pressure rotating bulk plasma is not operated, and it does not become 0 ppm even after 4 hours, while 170 ppm remains. , was reduced to 0 ppm in 2 hours and 20 minutes in the state [the upper part of (2)] operating the atmospheric pressure rotating bulk plasma [lower part of (1)], also 4 The result was reduced to 0 ppm in 3 hours and 20 minutes in the state in which atmospheric pressure rotating bulk plasma was operated [the lower part of (2)], whereas it did not become 0 ppm even after a period of time and 23 ppm remained.

As a result of testing the performance and efficacy of the atmospheric pressure rotating bulk plasma according to the present invention, it was first proved that it effectively sterilizes or sterilizes highly pathogenic viruses and fixed bacteria floating in the air, and ammonia, TVOC, and HCHO, which are harmful gases It can be confirmed that the fact that it has been proven to reduce very effectively.

In the above, specific embodiments of the present invention have been described with reference to the accompanying drawings, but this is merely exemplary and does not limit the scope of the present invention, and various changes are possible at the level of those skilled in the art with respect to the present invention, of course.

It should be noted that the shape, size, position, number, and material of each configuration or component of the present invention is provided as an example and may be appropriately changed according to the field of application.

It is apparent that the scope of the present invention extends to the same or similar scope as the claims set forth below.

Claims (7)

1. plasma forming unit; a blowing fan for introducing air into the plasma forming unit through an air inlet; a vortex guide plate in the form of a plate for swirling the introduced air; and a conical spiral wire-shaped voltage electrode for generating plasma in the plasma forming part and a barrel-type ground electrode facing the voltage electrode, wherein one end of the voltage electrode is fixed to the electrode fixing part, The other end is coupled to a rivet-type electrode end,

   The inclination angle (θ) of the blade formed on the vortex guide plate is less than or equal to the spiral angle of the voltage electrode, and the rotation direction of the introduced air is rotated in the same direction as the spiral direction of the voltage electrode. Atmospheric pressure rotary bulk plasma generator.
2. The method of claim 1,

   Atmospheric pressure rotating bulk plasma generator, characterized in that the radius of curvature of the round portion of the rivet-type electrode end has a value of 40 to 60% of the diameter of the discharge port of the barrel-type ground electrode.
3. The method of claim 1,

   The air inlet is an atmospheric pressure rotary bulk plasma generating device, characterized in that it has an air inflow path having a straight-through structure, not in the tangential direction of the barrel ground electrode.
4. The method of claim 1,

   Atmospheric pressure rotating bulk plasma generator, characterized in that the interval between the end of the rivet-type electrode end and the end of the discharge port of the barrel, which is the ground electrode, is within 15 to 25 mm to suppress arc discharge and increase the degree of glow discharge.
5. The method of claim 1,

   An atmospheric pressure rotating bulk plasma generating apparatus, characterized in that the distance (d) between the voltage electrode and the barrel-type ground electrode increases toward the air outlet, and the distance has a value between 3 and 10 mm.
6. An air conditioner comprising the atmospheric pressure rotary bulk plasma generator according to any one of claims 1 to 5.
7. An air purifier comprising the atmospheric pressure rotary bulk plasma generator according to any one of claims 1 to 5.

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