WO2023063440A1 - Air purifier comprising module for dissociation of hazardous materials of plasma generated during fluid processing and method for purifying air by using same - Google Patents

Abstract

The present invention relates to an air purifier comprising a module for dissociation of hazardous materials of plasma generated during fluid processing and a method for purifying air by using same and, more specifically, to an air purifier and a method for purifying air by using same, the air purifier comprising a module for dissociation of hazardous materials of plasma, in which hazardous materials contained in a fluid (contaminated air), such as viruses, bacteria, VOCs, odors, and the like, are removed by using a plasma generator, and materials hazardous to the human body and generated in the plasma generator, such as ozone, nitrogen oxide, and sulfur oxide, are effectively removed. The air purifier comprising a module for decomposition of germs in the air and odor-generating materials according to the present invention can effectively remove not only fine dust, but also various volatile organic compounds and non-degradable organic matter in the air through a reaction with ozone. In particular, by passing through a plurality of continuously arranged chambers, not only odor-generating materials but also unreacted ozone hazardous to the human body can be completely removed.

Description

Air purifier including module for dissociation of toxic substances in plasma generated during fluid treatment and method for purifying air using the same

The present invention relates to an air purifying device including a harmful substance dissociation module of plasma generated in a fluid treatment process and an air purifying method using the same, and more particularly, to a harmful substance contained in a fluid (contaminated air or atmospheric air). It includes a plasma harmful substance dissociation module that can remove phosphorus viruses, bacteria, VOCs, odors, etc. through the plasma generator and efficiently remove substances harmful to the human body such as ozone, nitric oxide and sulfur oxide, which are harmful substances generated from the plasma generator. It relates to an air purifying device and an air purifying method using the same.

Air pollution management to maintain clean air quality by treating dust, sulfur compounds, nitrogen oxides, odors, and volatile organic compounds (VOCs) generated from industrial activities is becoming more important. Electrostatic precipitators, desulfurization facilities, and nitrogen oxide treatment oxidizers are being utilized.

Odor is defined as the smell of hydrogen sulfide, mercaptans, amines, and other irritating gaseous substances that stimulate a person's olfactory sense and give unpleasant and disgusting odors. Representative materials include organic acids, alcohols, amines, aromatic compounds, aldehydes, esters, and sulfur compounds.

In addition, Volatile Organic Compounds (VOCs) are formaldehyde, toluene, ethylene, and styrene that exist in special spaces such as air, indoors, underground spaces, chemical factories, smoking areas, printing shops, chemical use spaces, and iron/smelting. It is a gaseous substance such as , acetaldehyde, benzene, etc., which exists in a combination of tens of ppm to thousands of ppm in the air and is very harmful to the human body.

These VOCs not only pollute the atmospheric environment, but also have adverse effects on humans and ecology (Aguero et al., 2009; Chen et al., 2014; Vandenbroucke et al., 2011). According to the US Environmental Protection Agency (EPA), about 70% of VOCs emitted into the atmosphere are suspected of being toxic (Larsson et al., 1996). The toxicity of VOCs can cause diseases such as allergic reactions, headaches, eye, nose, and throat irritation, loss of consciousness, and convulsions, and chemical reactions in the atmosphere form secondary pollutants such as PAN, ozone, and aerosols. Depletion of the ozone layer, acid rain, and greenhouse effect are aggravated.

In implementing regulatory management for actual VOCs so far, the United States has been the first _in the world to recognize the seriousness of air pollution since the 1960s. (NO ₂ ), particulate matter (PM), ozone (O ₃ ), and volatile organic compounds, etc. were established as air quality standards.

Research using plasma for the treatment of harmful gases has been steadily conducted at various universities and research institutes around the world since the early 1990s, and shows many possibilities for VOCs treatment, but there are still many challenges to be solved. It is pointed out that the generation of by-products is the most difficult problem. That is, in treating VOCs in the air, unexpected O ₃ , CO, NOx, and third hydrocarbons (generating factors of polymers) after plasma reaction can be mentioned as problems, which cannot be solved by low-temperature plasma reaction alone. A separate post-processing device is required.

In particular, in the case of ozone, it is generated by changing oxygen in the air by the operation of a plasma device, and it is highly likely to cause problems in the respiratory system when inhaled. Therefore, it is necessary to predict the generation of ozone and additionally provide an exhaust system, and even if the exhaust system is used, ozone often remains. Specifically, if the residual amount is 0.05 ppm or more, it is harmful to the human body, so when using an existing atmospheric pressure plasma device, an exhaust system is necessarily required, which inevitably causes a rise in equipment cost and restrictions on mobility.

On the other hand, a study on the improvement of decomposition efficiency of organic compounds by plasma process and catalytic surface chemical reaction is disclosed in the Journal of the Korean Institute of Electrical Engineers, Vol. 59, No. 5 (May 2010), but this study investigated the discharge characteristics of the barrier discharge reactor and produced The two-dimensional measurement results of the surface chemical reaction were discussed through laser optical measurement of the ozone generation characteristics of the reactor and the change in ozone concentration on the surface of the manganese dioxide catalyst, and the chemical reaction characteristics of oxygen radicals generated on the catalyst surface during ozone decomposition were analyzed. To investigate, the oxidation reaction of CO to CO ₂ , organic compounds (trichloroethylene (TCE, C ₂ HCl ₃ ), methyl alcohol (CH ₃ OH), acetone (CH ₃ COCH ₃ ), dichloromethane (CH ₂ Cl ₂ ), it was confirmed that the surface chemical reaction was actively occurring by analyzing the by-product generation characteristics through the chemical reaction with , and the possibility of improving the decomposition efficiency was studied by mixing the plasma process and the catalytic process.

However, in the above paper, when ozone (O ₃ ) is generated by a chemical reaction between an oxygen atom radical (O) generated by the decomposition of an oxygen molecule (O ₂ ) and another oxygen molecule inside the plasma reactor, the oxygen atom radical and CO are The problem that the oxidation reaction to CO ₂ does not proceed well due to the difference in electronic structure has not been solved. In addition, the technology of discharging gases harmless to the human body by bubbling CO ₂ and Cl ₂ passing through the plasma reactor and catalyst and the problem of not notifying the manager of the replacement period of the bubbling aqueous solution and activated carbon through the CO sensor are holding

While the present inventors were intensively researching to improve the problems of the prior art and develop an efficient air purifying device, as will be described later, the residue generated when using a liquid filter, which is a processing module using plasma and fluid having antibacterial properties, It was discovered that harmful substances such as ozone, fine dust, decomposition by-products, and remaining ozone could be completely removed, and the present invention was completed.

Therefore, the present invention manufactures a harmful substance dissociation module and a liquid filter that dissociates harmful substances in order to remove harmful substances such as ozone, fine dust, and decomposition by-products, which are residues generated when plasma having harmful substance removal and sterilization properties is used. The purpose of this is to completely remove the remaining ozone.

The purpose of the present invention as above is

In the air purifier for purifying air in the atmosphere (including air to be treated or polluted air),

A six-sided housing having an inlet through which air in the atmosphere flows in on one side, an exhaust port through which purified air is discharged on the other side, and a display unit on the other side;

A harmful substance dissociation module (1) disposed inside the housing and dissociating harmful substances including fine dust, ozone, and decomposition by-products generated by plasma discharge;

A sensor device installed in the indoor and plasma harmful substance dissociation module 1 to measure the air condition; and

A control device for controlling the operation of the air purifier according to the information measured by the sensor device;

The harmful substance dissociation module 1 of the plasma

a treatment fluid supply chamber 100 supplying atmospheric air containing viruses, bacteria, and odor-generating substances into the module;

A harmful substance removal chamber 200 including a plasma generator or an ozone generator therein and mixing ozone generated therefrom and air in the atmosphere to remove bacteria and odor-generating substances; and

A member for rotating or circulating the powdered metal catalyst 310 and the liquid in which the powdered metal catalyst 310 is mixed is provided therein, fine dust in the air passing through the harmful substance removal chamber 200, Including; ozone and fine dust removal chamber 300 for removing ozone and decomposition by-products,

The ozone and decomposition by-product removal chamber 300 includes a space that is not divided or is divided into one or more spaces by a partition wall 350, and a liquid in which a powdery metal catalyst 310 is mixed therein is rotated or A member for circulation is provided, and a porous member 321 forming fine bubbles is coupled to an end of the treatment air inlet pipe 340,

Air containing ozone that has passed through the harmful substance removal chamber 200 is introduced into the ozone and fine dust removal chamber 300 through the treatment air inlet pipe 340, and ozone and fine dust are circulated and bubbling the liquid. It can be achieved by an air purifier characterized in that dust is removed and an air purifying method using the same.

According to the present invention, an air purifying device including an air bacteria and odor generating substance decomposition module can effectively remove various volatile organic compounds and recalcitrant organic substances in the air by reacting with ozone as well as fine dust, viruses and bacteria, , In particular, it is possible to completely remove odor-generating substances as well as unreacted ozone harmful to the human body by passing through a plurality of chambers arranged in series.

1 is an overall configuration diagram of an odor generating substance decomposition module using ozone according to an embodiment of the present invention.

Figure 2 is a flow chart of a dissociation method of plasma harmful substances using the decomposition module of the present invention.

3 is a diagram showing an example of a processing fluid supply chamber.

4 is a view for explaining the structure of an ozone and fine dust removal chamber.

5 : is a figure explaining a porous member.

The present invention, in one aspect,

An air purifying device for purifying air in the atmosphere,

A six-sided housing having an inlet through which air in the atmosphere flows in on one side, an exhaust port through which purified air is discharged on the other side, and a display unit on the other side;

A harmful substance dissociation module (1) disposed inside the housing and dissociating harmful substances including fine dust, ozone, and decomposition by-products generated by plasma discharge;

A sensor device installed in the indoor and plasma harmful substance dissociation module 1 to measure the air condition; and

A control device for controlling the operation of the air purifier according to the information measured by the sensor device;

The harmful substance dissociation module 1 of the plasma

a treatment fluid supply chamber 100 supplying atmospheric air containing viruses, bacteria, and odor-generating substances into the module;

A harmful substance removal chamber 200 including a plasma generator or an ozone generator therein and mixing ozone generated therefrom and air in the atmosphere to remove bacteria and odor-generating substances; and

A member for rotating or circulating the powdered metal catalyst 310 and the liquid in which the powdered metal catalyst 310 is mixed is provided therein, fine dust in the air passing through the harmful substance removal chamber 200, Including; ozone and fine dust removal chamber 300 for removing ozone and decomposition by-products,

The ozone and decomposition by-product removal chamber 300 includes a space that is not divided or is divided into one or more spaces by a partition wall 350, and a liquid in which a powdery metal catalyst 310 is mixed therein is rotated or A member for circulation is provided, and a porous member 321 forming fine bubbles is coupled to an end of the treatment air inlet pipe 340,

Air containing ozone that has passed through the harmful substance removal chamber 200 is introduced into the ozone and fine dust removal chamber 300 through the treatment air inlet pipe 340, and ozone and fine dust are circulated and bubbling the liquid. An air purifier characterized in that dust is removed and an air purifying method using the same are provided.

Hereinafter, an air purifying device and an air purifying method using the same according to the present invention will be described in more detail with reference to the accompanying drawings.

The present invention can make various changes and have various embodiments, and specific embodiments are specifically described in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

In addition, terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is directly connected or connectable to the other element, but there is another element between the elements. It will be understood that elements may be “connected”, “coupled” or “connected”.

In the present invention, 'Volatile Organic Compounds (VOCs)' refers to formaldehyde, It is a substance such as toluene, ethylene, styrene, acetaldehyde, and benzene, and most of them contain a double bond between carbon and carbon (sigma (σ), pi (π) bond).

In addition, chemical bonds are formed by overlapping orbitals of atoms participating in the bond. For example, a hydrogen molecule is formed by overlapping the 1s orbital of two hydrogen atoms, and in hydrogen fluoride, the 1s orbital of a hydrogen atom and the 2p orbital of fluorine are overlapped. The electrons forming the bond in these two materials are located around the axis (bonding axis) connecting the nuclei of the two atoms forming the bond, so the distribution of electrons becomes cylindrically symmetrical. Such a bond is called a sigma (σ) bond. There is a pi (π) bond that exhibits different characteristics from the sigma bond. That is, when py orbitals and py orbitals overlap to form a bond, the electron cloud is distributed above and below the bonding axis, and this bond is called a pi bond.

In the present invention, 'decomposition by-product' is a substance produced by the reaction of radicals generated through a plasma generator described later with harmful substances such as the volatile organic compound, and the decomposition by-products generated may be different depending on the type of harmful substance. For example, ammonium nitrate (NH ₄ NO ₃ ), ammonium nitrite (NH ₄ NO ₂ ), sulfurous acid (H ₂ SO ₃ ), sulfuric acid (H ₂ SO ₄ ), methane (CH ₄ ), hydrogen (H ), formic acid (HCOOH), acetic acid (CH ₃ COOH), nitrogen (N ₂ ), oxygen (O ₂ ), and chlorine (Cl ₂ ).

The present invention includes a module that decomposes and removes odor-generating substances by passing air in the atmosphere containing odor-generating substances, such as livestock breeding grounds or soot, through a plurality of chambers arranged in series. At this time, the module basically uses air. It is characterized in that the odor-generating substances are removed using the generated ozone, and even ozone remaining after the odor-generating substances is removed is completely removed.

1 is an overall configuration diagram of an odor generating substance decomposition module using ozone according to an embodiment of the present invention, FIG. 2 is a flow chart of a plasma harmful substance dissociation method using the decomposition module of the present invention, and FIG. 3 is a process It is a view showing an example of a fluid supply chamber, FIG. 4 is a view explaining the structure of an ozone and fine dust removal chamber, and FIG. 5 is a view explaining a porous member.

An air purifying device including a harmful substance dissociation module 1 of plasma generated in a fluid treatment process according to the present invention is an air purifying device that mainly purifies atmospheric air or polluted air, and includes a housing, a harmful substance dissociation module, and a sensor device. , The display unit and the control unit are organically and operably coupled, and a typical connection line is omitted for convenience.

The housing has an intake port through which air containing pollutants including air in the atmosphere or odor components generated in the indoor space is introduced, and an exhaust port through which pollutant-purified air is discharged back to the indoor space on the other side. is preferably formed.

On the other hand, it is common that an air circulation means is further provided to circulate the operated air, and the air circulation means can be installed at any one or more of the inlet side, the inside of the housing, or the exhaust port side, It may be preferable to consist of an exhaust blower (not shown) further connected to the exhaust port and further installed to prevent contamination and stable operation of the air circulation means.

In addition, the other side (mainly, the upper front) of the housing is provided with a display unit that can visually check the operating state of the device by the control action of the control device, and the housing generally has a hexahedral shape.

The harmful substance dissociation module 1 is disposed inside the housing and efficiently dissociates harmful substances (in particular, ozone) including fine dust, ozone, and decomposition by-products generated by plasma discharge.

The harmful substance dissociation module 1 includes an atmospheric air supply chamber 100 for supplying atmospheric air containing odorous substances into the module; A harmful substance removal chamber 200 including a plasma generator or an ozone generator therein and mixing ozone generated therefrom and air in the atmosphere to remove bacteria and odor-generating substances; and a member for rotating or circulating a powdered metal catalyst 310 and a liquid in which the powdered metal catalyst 310 is mixed therein, and fine dust, ozone and It may be preferable to be configured to include; ozone and fine dust removal chamber 300 for removing decomposition by-products.

The ozone and decomposition by-product removal chamber 300 includes a space that is not divided or is divided into one or more spaces by a partition wall 350, and a liquid in which a powdery metal catalyst 310 is mixed therein is rotated or A member for circulation is provided, and a porous member 321 forming fine bubbles is coupled to an end of the treatment air inlet pipe 340,

Air containing ozone that has passed through the harmful substance removal chamber 200 is introduced into the ozone and fine dust removal chamber 300 through the treatment air inlet pipe 340, and ozone and fine dust are circulated and bubbling the liquid. Dust is removed.

Alternatively, an air supply pipe 320 to which pressurized air is supplied by a pump is introduced from the bottom or side surface, and a porous member 321 forming fine bubbles may be coupled to an end of the air supply pipe 320.

The air supply chamber 100 in the atmosphere is for storing air or fluid that needs to be filtered, including odor-generating substances or other organic compounds, and supplying it to the decomposition chamber during processing, and a blower for generating a fluid flow. , not shown), a pump or blowing means may be provided inside.

The air in the atmosphere is not limited to a type as long as it is a gas containing odorous substances, organic compounds, or fine dust that needs to be purified or decomposed. For example, gases present in the atmosphere, indoors, underground spaces, chemical factories, smoking areas, printing shops, chemical use spaces, iron manufacturing, smelting, etc. Paraffin, olefin, benzene, toluene, nitrogen oxides, and acetic acid in the gas aldehydes and the like.

In addition, the air supply chamber 100 in the atmosphere has a passage connected to the decomposition chamber, and a filtering unit (not shown) for filtering fine dust or impurities in the air in the atmosphere may be further provided in the passage.

At this time, the filtering unit is not limited in the present invention, and for example, a filter, a porous material, etc., which can physically collect fine dust or particles while passing a fluid, or an electric precipitator, an oil-water separator, etc., including dust, moisture, Liquid or solid contaminants such as oil can be temporarily purified.

In the present invention, the harmful substance removal chamber 200 is provided separately from the air supply chamber 100 in the atmosphere, and includes a plasma generator or an ozone generator 210 therein to supply ozone to the air in the introduced atmosphere. It is provided to decompose odor-generating substances in the air or their primary decomposition products, and has a plasma generator or ozone generator 210 inside to ionize oxygen in the fluid to completely decompose odor-generating substances.

In the present invention, the plasma generator or ozone generator 210 may be selectively used as needed, and is not limited to a type as long as it is used in a general organic material decomposition system that decomposes organic compounds through OH radicals.

In general, plasma generation injects gas between two electrodes and applies a high voltage to the electrode to change the gas into a plasma state. When electricity is applied to the electrodes, electrons flow between the electrodes. Oxygen molecules are separated by the energy of these electrons, resulting in strong reactive oxygen radicals (O·), hydroxyl radicals (OH·), and nitrogen radicals (N·). , hydrogen dioxide radicals (HO ₂ ·), hydrogen radicals (H · ), etc. form ozone molecules.

Specifically, the plasma generator generates various active species such as oxygen radicals (N ₂ ⁺ , N ⁺ , e, N, N (2D)) , O ₂ ⁺ , O ⁺ , O, O( ² D), H ₂ O ⁺ , OH, H, CO ₂ ⁺ , etc.). The radicals generated as described above react with the odorous substance together with the electrons formed by the plasma generator to cleave the sigma (σ) and pi (π) bonds of the odorous substance to generate various carbon compounds, and the generated carbon compounds are again It reacts with other radicals and is completely decomposed and converted into decomposition by-products such as nitrogen, oxygen, chlorine, carbon dioxide, and solid carbon.

At this time, the plasma generator can be generally classified according to the intensity or frequency of power applied to the electrode, and an ozone generator using a low frequency (50 to 60 Hz) and a medium frequency (60 to 1,000 Hz) is generally used. The mid-frequency generator is efficient and can generate high-concentration ozone, but generates high heat compared to the low-frequency generator, so it is preferable to use a micro-plasma type low-frequency generator capable of generating low-temperature plasma by miniaturizing it.

However, the plasma generator generates various active species as described above, but oxygen radicals are also converted into ozone through the following reactions.

(In Scheme 4 above, M refers to a third substance that assists in the production of ozone.)

The ozone is an allotrope of oxygen in which three oxygen atoms are bonded, and has much stronger oxidizing power than general oxygen, so it is used for sterilization or odor removal. Such ozone is widely used in the field of water purification and wastewater treatment through ozone oxidation, such as sterilization, iron/manganese treatment, cyanide removal, taste and odor treatment, coagulation auxiliary effect, enhancement of biodegradation of organic matter, and treatment of non-degradable organic matter.

In addition, ozone is decomposed by the hydroxyl group, and as intermediate products, OH radicals are generated through intermediate pathways such as hydroperoxy radicals (HO ₂ ^- ), superoxide radicals (O ₂ ^- ), and ozonide radicals (O ₃ ^- ). This OH radical has a higher potential difference than ozone itself (O ₃ : 2.07V, OH radical: 3.08V) and reacts evenly with almost all organic substances at a very high speed, so it plays a role in further increasing the removal rate of odor-causing substances. do.

When the ozone generated as described above is mixed with air in the atmosphere in the mixing chamber, similar to the radicals, sigma (σ) and pi (π) bonds of organic compounds are cleaved to generate various carbon compounds, and the generated carbon The compound reacts with other radicals again and is completely decomposed and converted into decomposition by-products.

In addition, ultraviolet rays of a specific band (UVA light in a wavelength range of 300 to 400 nm) emitted during plasma discharge generate hydroxyl free radicals to decompose organic compounds, ammonia, and amines. However, since the decomposition of organic compounds by ultraviolet light can be promoted by a photocatalytic reaction, it is preferable that the inner wall of the decomposition chamber is further coated with a photocatalyst capable of causing a photocatalytic reaction with the ultraviolet light.

Specifically, when the ultraviolet rays generated during the plasma discharge are irradiated to the photocatalyst layer coated on the inner circumferential surface of the decomposition chamber, a photocatalytic reaction occurs to generate hydroxyl radicals, thereby reducing formaldehyde or VOCs (Volatile Organic Compounds: It can decompose harmful substances such as volatile organic compounds) into H ₂ O and CO ₂ that are harmless to the human body.

It may be preferable that the plasma generator 210 employs a hole-type surface discharge plasma or is composed of a DBD ceramic plate to generate high-concentration ozone around 15 ppm to ensure sterilization of viruses and bacteria.

As shown in FIG. 3, the harmful substance removal chamber 200 in the present invention is a device for mixing and contacting air and ozone in the atmosphere, and may be composed of a housing made of a corrosion-resistant material or metal.

The high-concentration ozone generated by the plasma generator or the ozone generator 210 comes into contact with incoming indoor air, atmospheric air, or contaminated air (BA) to sterilize microorganisms including bacteria and viruses, and sterilize ozone and treated air. passes through the plurality of partition walls 220 arranged in a zigzag pattern, and the treated air AA passing through the partition walls 220 is transported to the ozone and fine dust removal chamber 300 .

In addition, the harmful substance removal chamber 200 may be equipped with various means for dissolving ozone in order to further increase the contact between the harmful substances and radicals, ozone, etc., when air in the atmosphere contains liquid. For example, ozone may be diffused in the form of bubbles (bubble diffuser contactor), an ozone injector may be provided, or a turbine mixer contactor may be included in the chamber.

The harmful substance removal chamber 200 may further include a filtering unit (not shown) for filtering decomposition by-products generated by the decomposition of the odor generating substance. At this time, the filtration unit may be provided in the passage between the decomposition chamber and the ozone and fine dust removal chamber, and the filtration method, structure, type, etc. are not limited, but it is preferable to include the above-described porous material or filter.

In addition, in the harmful substance removal chamber 200, an adsorption filter adsorbs odor-generating substances, ozone, decomposition by-products, etc. to increase the contact time between them, thereby increasing the treatment efficiency of odor-generating substances and assisting in filtering decomposition by-products ( not shown) may be further provided. At this time, the adsorption filter is not limited in its material, etc., but it is preferable to include a zeolite-based porous mesoporous material in order to promote the adsorption of odor-generating substances having a large molecular weight.

As described above, since the air (AA) exiting the harmful substance removal chamber 200 may contain ozone remaining therein, a powdered metal catalyst 310 and a powdered metal catalyst 310 are installed therein to remove it. It can pass through the ozone and fine dust removal chamber 300 equipped with a member for rotating or circulating the mixed liquid.

In general, ozone is a cleaning agent having strong sterilization and oxidizing power as described above, but it also contributes to global warming and can adversely affect the environment and human body. Therefore, in order to further add a process for removing this, the air in the atmosphere from which all odor-generating substances are removed is passed through the ozone and fine dust removal chamber to completely remove even ozone.

Conventional ozone removal technologies include an adsorption method using activated carbon or zeolite, a heating method by applying high-temperature heat, a chemical cleaning method, etc. However, in the case of the heating method, a lot of energy must be consumed to heat the fluid.

In order to solve these disadvantages, the present invention introduces a method of decomposing ozone through a catalytic reaction using a powdery metal catalyst for oxidizing ozone. It maximizes the removal efficiency of microorganisms including viruses, ozone and fine dust by removing them below ppm.

Specifically, the oxyhydroxide of the metal generates OH radicals in an oxidation-reduction process, and since these OH radicals have high reactivity with ozone, remaining ozone can be quickly removed.

For example, when ferric acid hydroxide is used as the metal acid hydroxide, ozone is removed by OH radicals generated in the Fe ²⁺ /Fe ³⁺ redox cycle process as shown in Scheme 5 below, and by using the catalyst as described above, It is possible to maximize the ozone removal time efficiency by lowering the activation energy.

In addition, since the metal oxide hydrate can act as a filtering medium for removing impurities in the air, particularly arsenic and heavy metals, in addition to a role of decomposing ozone, the filtration efficiency of air in the atmosphere can be further increased.

The metal hydroxide according to the present invention is characterized in that it has a form of a hydroxide represented by Chemical Formula 1 below.

In Formula 1, n is an integer from 1 to 6, and Me is 1 selected from the group consisting of trivalent metals Fe and Al and divalent metals Fe, Mg, Mn, Zn, Ca, Cu, Na, and Li Contains more than one metal.

The above metal hydroxide is prepared using cations generated in the form of sulfate or chloride, and cations such as trivalent metals Fe and Al or divalent metals Fe, Mg, Mn, Zn, Ca, Cu, Na, and Li are It reacts with water in slightly alkaline or slightly acidic solutions to form a poorly soluble hydroxide salt precipitate.

For example, as shown in Scheme 6 below, a precipitate in the form of a hydroxide may be generated by reacting a single molecule generated from a sulfate or chloride of iron or manganese by adding an alkali additive for pH control, for example, sodium hydroxide. Precipitates are used as metal oxides.

In the present invention, the method for producing the metal acid hydrate is not limited to the type as long as it is a method commonly used in the art. It can be prepared by mixing with water and stirring until the solid coagulant is completely dissolved, reacting it with an alkali additive, and filtering and drying it when a precipitate is generated. In this case, the inorganic coagulant is limited only when the iron salt or manganese salt is in a solid state, and no inorganic coagulant is required when the iron salt or manganese salt is in a liquid state.

In addition, the alkali additive added to generate the precipitate of the hydroxide salt is to adjust the total pH to 6 or more, and it is preferable to proceed by reacting for 1 to 3 hours after adding the alkali additive. At this time, as the alkali additive, for example, calcium hydroxide (Ca(OH) ₂ ), sodium carbonate (Na ₂ CO ₃ ), and sodium hydroxide (NaOH) may be applied.

Here, hydrochloric acid (HCl) or the like may be mixed in order to increase the porosity of the metal hydroxide precipitated separately from the alkali additive.

On the other hand, the metal hydroxide prepared as described above can form a porous molded body having pores therein through a method such as a polymer, ceramic, and foaming, such as another medium.

In the present invention, more preferably goethite (α- FeOOH), akaganeite (β-FeOOH), lepidocrocite (γ-FeOOH), the high pressure phase (hp (ε)-FeOOH) and feroxyhyte (δ- It is preferable to use a mixture of boehmite (-AlOOH) and manganese acid hydrate among ferric acid hydroxides and aluminum hydroxides containing 5 types of polymorphs of FeOOH). As described above, when iron hydroxide, aluminum hydroxide, and manganese hydroxide are mixed and used, the decomposition efficiency of ozone can be further increased. It is preferable that permanganate hydroxide is mixed with iron hydroxide and manganese acid hydroxide in a weight ratio of 5.5 to 8.0 : 2.0 to 4.5, and aluminum hydroxide in a weight ratio of 1 to 5, most preferably 3 weight ratio.

In the present invention, various treatment conditions such as the amount of the metal catalyst, reaction temperature and reaction time are not limited in the present invention. For example, the amount of the metal catalyst is 5 to 15 parts by weight relative to 100 parts by weight of air in the atmosphere, the temperature is room temperature (around 20 ° C), and the reaction time can be freely adjusted. In addition, the supply amount of air in the atmosphere containing the ozone is not limited, but may be freely adjusted in the range of 0.01 to 100 L/sec.

The ozone and fine dust removal chamber 300 may not be divided according to ozone concentration or may be divided into one or more spaces by an intermediate partition wall 350, and one side of the partition wall 350 is for moving the neutralized water solution. A passage can be opened.

A neutralized water solution supply pipe 330 for supplying a neutralized water-containing solution into the chamber is provided at the top of the ozone and fine dust removal chamber 300, and is drawn into the chamber.

A processing air inlet pipe 340 through which air from which germs and odor-generating substances are removed from the harmful substance removal chamber 200 is introduced is introduced from the bottom to the inside, and a powdered metal catalyst 310 solution is provided inside the chamber. , and a member for rotating or circulating the liquid in which the powdered metal catalyst 310 is mixed may be further provided.

Also, if necessary, an air supply pipe 320 through which pressurized air is supplied by a pump may be introduced from the bottom (or side point) of the chamber and provided.

The neutralized water solution supply pipe 330 serves to intermittently supplement the evaporation of the neutralized water solution and evaporated neutralized water solution.

The air from which germs and odor-generating substances are removed is brought into contact with the metal powder catalyst 310 solution, and microscopic particles are formed by the pressurized air supplied through the processing air inlet pipe 340 and/or the air supply pipe 320. Bubbles and the neutralized water solution supplied through the neutralized water solution supply pipe 330 are bubbled, and fine dust, ozone, and decomposition by-products are dissolved and purified in the neutralized water solution, and the air pushed upward passes through the pumping pipe 360. It may be preferable that the purified air after being transported to another divided space and purified again through a bubbling process be exhausted through an outlet 370 formed at the upper portion.

The pumping pipe 360 communicates with each other at the upper part of the divided space at the upper part of the ozone and fine dust removal chamber 300 and provides a passage through which the air purified by the bubbling process moves to the other divided space.

One side of the pumping pipe 360 communicates with the upper surface of the ozone and fine dust removal chamber 300, and the other side has an extended length so that it is sufficiently submerged in water.

The air supply pipe or inlet pipe may supply or transport air by operation of a pump.

The processing air inlet pipe 340 and/or the air supply pipe 320 generate fine bubbles in the neutralized water solution and supply pressurized air so that the bubbled air is pumped through the pumping pipe 360 by pressure. make it move

When the chamber 300 is not divided, the intermediate partition wall 350 and the pumping pipe 360 may be omitted.

In addition, a rotating fan 385 or a spiral structure 386 may be provided on the lower surface of the ozone and fine dust removal chamber 300, and a ring blower (not shown) may be provided at an end of the treatment air inlet pipe 340. It may be preferable to further promote the removal of ozone by microbubbles by providing rotation or circulation of the liquid.

The spiral structure is preferably formed in the form of a protrusion on the bottom of the ozone and fine dust removal chamber 300, and the microbubbles discharged from the processing air inlet pipe 340 or the air supply pipe 320 have a spiral structure installed on the bottom of the chamber. As it collides with the projection of the microbubble, it receives rotational force and floats while rotating along with the liquid.

As the liquid is rotated at a low speed by the rotating fan 385 and the spiral structure 386, microbubbles discharged from the air inlet pipe 340 do not rise vertically but circulate and float along the direction in which the liquid rotates, thereby removing ozone. efficiency can be further increased.

In this case, the purified air pushed to the top is exhausted through the outlet 370 formed at the top.

In addition, it may be more preferable that the air supply pipe 320 is installed on the bottom of the chamber or supplies air from the middle of the side rather than the bottom of the chamber, thereby reducing the load of the pump and forming fine bubbles.

On the other hand, part of the supply pipe or inlet pipe (320, 330, 340, 350) may be omitted or connected on the way using another pipe and a three-way valve. For example, the process air supply pipe 340 containing ozone and the pressurized air supply pipe 320 are integrated into one, the air supply pipe 320 is omitted, and the air containing ozone together with the pressurized air is supplied to the process air supply pipe 340. ) may be designed to be introduced together. In this case, a ring blower may be provided at an end of the porous member 321 .

The neutralized water solution used for a long time is discharged through the outlet 380.

As illustrated in FIG. 5, the porous member 321 for forming the microbubbles is formed by being coupled to the end of the treatment air inlet pipe 340 or the air supply pipe 320, and is selected from natural minerals, ceramics, and mixtures thereof. It is preferably made of a ceramic foam or sponge made from one or more selected species.

The porous member 321 is not limited to a cylindrical shape, a column shape, or a spherical shape, and pressurized air is diffused in water to form microbubbles.

The porous member 321 includes open pores with an average diameter of less than 10 μm, preferably has a porosity of 80% or more, and more preferably has an average diameter of 0.3 to 1.5 mm of the formed microbubbles. .

The neutralized water-containing solution preferably has a pH of 6.5 to 7.5 and is an aqueous solution containing an aluminum compound.

The concentration of the aluminum compound contained in the solution containing the aluminum compound is preferably 1 to 3.5 mg/L.

The sensor device is installed in the indoor and air plasma harmful substance dissociation module to measure the air condition and output the result to the control device.

The sensor is the value detected by O ₃ , VOC, PM2.5, PM10, PM100, temperature and humidity sensors, etc. output to the controller.

The control device controls the overall operation of the air purifier and controls the operation of the air purifier according to information such as concentrations of nitrogen oxide, ozone, and nitrogen dioxide measured by the sensor device.

Specifically, the control device may calculate the value sensed by the sensor device to determine the air condition of each indoor space. At this time, the control device may divide the air condition of each indoor space into a plurality of steps according to the value sensed by the sensor device. For example, the air condition may be divided into 4 stages such as 'good', 'normal', 'bad', and 'very bad' as the value sensed by the sensor device increases, but is not limited thereto. In particular, the control device may divide the fine dust state into a plurality of stages according to the interval of the fine dust concentration value measured by the fine dust sensor.

In addition, the control device may control an on/off operation of air purifiers disposed in each indoor space. That is, the control device may control each air purifying device to operate at regular intervals or control each air purifying device to operate according to an air condition detection value measured by a sensor device. For example, if the state of fine dust in an indoor space corresponds to a level higher than 'normal' or 'bad', the control device may control the air purifier of the indoor space to operate or strongly operate. Therefore, the air quality management system according to an embodiment of the present invention can effectively prevent infections in hospitals.

In addition, the control device may generate and transmit display information to a display unit or a user terminal, and may control various types of information to be stored in a storage device (not shown).

The display unit may display display information generated by the control device and provide it to a manager (eg, a medical staff in case of a hospital building).

At this time, the display unit includes air condition measurement items (for example, fine dust concentration, carbon dioxide concentration, temperature, humidity, VOC concentration, ozone concentration, etc.) for each indoor space, measured values for each sensor of the sensor device of the corresponding indoor space, etc. can display In particular, the display unit may divide and display each air condition measurement item in multiple stages.

For example, the display unit may include a liquid crystal display (LCD), a light-emitting diode (LED) display device, an organic light-emitting diode (OLED) display device, and a quantum dot (quantum dot) display device. It may be a dot (QD) display device, a microelectromechanical systems (MEMS) display device, or an electronic paper display device, but is not limited thereto.

In this way, a network environment including an ICT platform can be constructed using the control device.

In another aspect, the present invention provides an air purification method using a harmful substance dissociation module of plasma generated in the fluid treatment process.

The air purification method includes a) supplying atmospheric air containing bacteria and odor-generating substances into a module; b) a plasma treatment step of removing bacteria and odor-generating substances by bringing plasma (ozone) into contact with the incoming fluid; c) an ozone concentration measurement step of measuring concentrations of ozone and decomposition by-products in the air after plasma treatment; and d) when the concentration of ozone in the atmospheric air in step c) is higher than the set concentration, it contacts the metal catalyst to remove ozone remaining in the atmospheric air by using hydroxyl radicals, which are supplied through the air supply pipe 320. Fine bubbles formed by the pressurized air and the neutralized water solution supplied through the neutralized water solution supply pipe 330 are bubbled to dissolve and purify fine dust, ozone, and decomposition by-products in the neutralized water solution, and the air pushed upward A step of dissociating fine dust ozone and decomposition by-products that are transported to another divided space through a pumping pipe 360, purified again through a bubbling process, and then exhausted through an outlet 370 formed on the upper part of the purified air; do.

In the present invention, steps a), b), and d) are performed through the above-described module, and overlapping descriptions are omitted. After the confirmation process, if the ozone concentration in the air is less than the set concentration, it is possible to proceed directly to the air discharge step (S500) without going through the step d), but if the dissolved ozone concentration is greater than the set concentration, the metal catalyst Ozone remaining in the air in the atmosphere can be removed by using a hydroxyl radical ( OH).

At this time, in the step c), it is preferable to measure the concentration of ozone in the air in the atmosphere by accommodating the air in the atmosphere in contact with the plasma in a bathtub provided separately. It is preferable to be provided to be connected to a plasma generating bath, a metal catalyst contact bath, and an air discharge bath in the atmosphere through a dissolved ozone concentration meter that can be used and each pipe.

In this way, when the dissolved ozone concentration meter measures the concentration of dissolved ozone in the air in the atmosphere in the bathtub and detects that the concentration is higher than the set concentration, the pipe connected to the metal catalytic contact bath is opened to flow the air in the atmosphere into the metal catalytic contact bath to decompose dissolved ozone can do. On the contrary, when the measured concentration of dissolved ozone is less than a set concentration, it is preferable to open a pipe connected to the air discharging tub to discharge air in the atmosphere.

In this way, the air in the atmosphere containing harmful substances in the atmosphere uses OH radicals generated in the plasma to remove the harmful substances in the harmful substance removal chamber 200, and in step d), the secondary harmful substances generated in the plasma are removed. Ozone is introduced into the ozone and fine dust removal chamber 300 and a porous member is installed so that the ozone is removed while the gas floats by fine bubbling.

In addition, when air in the atmosphere is supplied through steps a) to d), it is preferable to connect each treatment bath with a completely closed pipe to prevent residual dissolved ozone from being discharged into the atmosphere.

According to the bubbling care method according to the plasma air sterilizer according to the present invention, air containing harmful substances pressurized by a pump, etc. is removed and introduced into the ozone and fine dust removal chamber 300 together with the ozone generated in the plasma to form fine bubbles in the liquid mixed with the metal catalyst through a porous member and a member for rotating the liquid installed on the bottom of the chamber (fan or spiral structure), ozone is decomposed and fine dust is removed in the process of floating while rotating along with the rotating liquid, and the air discharged through the final air outlet is clean air from which harmful substances and fine dust ozone are removed. supply effect.

The present invention provides a decomposition module capable of effectively removing odor-generating substances such as hydrogen sulfide, mercaptans, amines, and aromatic compounds using plasma as described above.

In addition, even after the odor-generating substances are removed, the ozone generated in the plasma generator is completely removed through the metal oxyhydroxide catalyst, thereby having an excellent odor-causing substance reduction effect and not creating an environment harmful to the human body.

Hereinafter, the present invention will be described in more detail by way of Examples and Comparative Examples. However, the following Examples and Comparative Examples are only examples for explaining the present invention in more detail, and the present invention is not limited to the following Examples.

(ozone removal rate)

Ozone was generated so that the concentration of ozone in the air was 10 ppm through a plasma generator. In addition, after passing the ozone-containing gas through a bathtub equipped with a metal catalyst, the concentration was measured with a dissolved ozone meter (Gastiger 2000, Wandi), and the removal rate was calculated by substituting into Equation 1 below.

(In Equation 1 above, Ca is the initial concentration of ozone in the air, and Cb is the concentration of ozone in the air after contact with the metal catalyst.)

Examples 1 to 5

A metal compound in which ferrous sulfate (FeSO ₄ ) as iron chloride and manganese sulfate (MnSO ₄ ) as manganese chloride are mixed in a certain ratio (unit mol) according to the conditions in Table 1 below is mixed with water to liquefy, and then Sodium hydroxide (NaOH) was added and reacted for 3 hours in a state where the pH was adjusted to 6 to prepare a mixture of ferric acid hydroxide and manganese acid hydroxide. An ozone removal test was performed using the malodor generating substance decomposition module using ozone as shown in FIG. 1 and according to the dissociation method of harmful plasma substances as shown in FIG.

After installing the mixture of the metal acid hydroxide as described above in a bathtub, the ozone concentration before and after the ozone removal step was measured to analyze the removal rate.

As shown in Table 1, the dissociation module and dissociation method according to the present invention include a metal catalyst, which is a mixture of ferric acid hydroxide and manganese acid hydroxide, inside the ozone removal chamber of the module, thereby removing ozone from the fluid.

Specifically, Examples 2 to 4 in which iron and manganese acid hydroxides were mixed in a weight ratio of 6:4, 7:3, and 8:2, respectively, satisfied the dissolved ozone removal rate of 99.5% or more, but iron and manganese acid hydroxides It can be seen that Example 1 with a content of 1:1 and Example 5 with a content of 9:1 both had a low ozone removal rate that did not satisfy even 80%, so that the optimal composition ratio of the metal acid hydroxide was 5.5 to 8.0: 2.0 to 4.5 weight ratio.

Examples 6 to 8

When the concentration of ozone generated in the plasma is high, there is a limit in dissociating ozone with only ferric acid hydroxide and manganese acid hydroxide, so when aluminum hydroxide is added to the weight ratio of ferric acid hydroxide and manganese acid hydroxide to remove high concentration ozone, the ozone removal efficiency is increased. It was confirmed, and the results are shown in Table 2 below.

	Al weight ratio	ozone concentration		Removal rate (%)
		before processing	after treatment
Example 6	One	20	2.615	86.9
Example 7	3	20	1.305	93.4
Example 8	5	20	2.230	88.5

From the results of Table 2, it was confirmed that the ozone removal efficiency was further increased when aluminum hydroxide was added.

Examples 9 to 12: Comparison of ozone removal rates according to pore sizes of porous members

The ozone removal rate was compared and tested by varying the pore size of the porous member, and the results are shown in Table 3.

	Porous member pore size	ozone concentration		Removal rate (%)
		before treatment	after treatment
Example 9	No stomatal control	20	12.504	37.48
Example 10	1~10mm	20	8.959	55.205
Example 11	10~1000㎛	20	3.656	81.72
Example 12	10㎛ or less	20	1.992	90.04

As a result of analyzing the ozone removal rate according to the pore control and pore size of the porous member in Table 3, it was investigated that the ozone removal concentration increased when the pore size of the porous member was adjusted to 10 μm or less.

Examples 13 to 15: Comparison of ozone removal rates according to liquid mixing fans and spiral structures

The ozone removal rate according to the liquid mixing fan and the spiral structure was compared, and the results are shown in Table 4.

	Liquid circulation method	ozone concentration		Removal rate (%)
		before processing	after treatment
Example 13	No liquid circulation (stoma immediately rises)	20	11.02	44.9
Example 14	fan for liquid circulation	20	6.113	69.435
Example 15	Liquid circulation method using a spiral structure	20	6.824	65.88

As shown in Table 4, it was investigated that the ozone removal efficiency was increased in a method of floating air bubbles by circulating the liquid rather than floating air bubbles without liquid circulation.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those skilled in the art to which the present invention belongs Of course, various modifications and variations are possible within the scope of equivalents of the claims to be set forth.

Claims (5)

1. In the air purifying device for purifying air or polluted air in the atmosphere,

   A hexahedral housing having an inlet through which atmospheric air or polluted air is introduced, an exhaust port through which purified air is discharged, and a display unit formed on the other side;

   a harmful substance dissociation module disposed inside the housing and dissociating harmful substances including fine dust, ozone, and decomposition by-products generated by plasma discharge;

   A sensor device installed in the indoor and air plasma harmful substance dissociation module to measure the air condition; and

   A control device for controlling the operation of the air purifying device according to the information measured by the sensor device;

   The harmful substance dissociation module of the plasma

   a processing fluid supply chamber 100 supplying atmospheric air containing bacteria and odor-generating substances into the module;

   A harmful substance removal chamber 200 including a plasma generator or an ozone generator therein to mix ozone generated therefrom and air in the atmosphere to remove bacteria and odor-generating substances; and

   A member for rotating or circulating the metal powder catalyst 310 and the liquid in which the powder metal catalyst 310 is mixed is provided therein, fine dust in the air passing through the harmful substance removal chamber 200, Including; ozone and fine dust removal chamber 300 for removing ozone and decomposition by-products,

   The ozone and decomposition by-product removal chamber 300 includes a space that is not divided or is divided into one or more spaces by a partition wall 350, and a liquid in which a powdery metal catalyst 310 is mixed therein is rotated or A member for circulation is provided, and a porous member 321 forming fine bubbles is coupled to an end of the treatment air inlet pipe 340,

   Air containing ozone that has passed through the harmful substance removal chamber 200 is introduced into the ozone and fine dust removal chamber 300 through the treatment air inlet pipe 340, and ozone and fine dust are circulated and bubbling the liquid. An air purifier characterized in that dust is removed.
2. The method of claim 1,

   The ozone and decomposition by-product removal chamber 300

   At the upper part, a neutralized water solution supply pipe 330 for supplying a neutralized water-containing solution into the chamber is introduced into the chamber and provided.

   A treatment air inlet pipe 340 through which air from which germs and odor-generating substances are removed from the harmful substance removal chamber 200 is introduced is provided from the bottom to the inside,

   An air supply pipe 320 to which pressurized air is supplied by a pump is drawn into the inside from the side and provided,

   The powdery metal catalyst 310 solution is provided in the chamber, and the air from which germs and odor-generating substances are removed is first contacted with the metal catalyst 310 solution,

   Fine bubbles formed by the pressurized air supplied through the treatment air inlet pipe 340 or the air supply pipe 320 and the neutralized water solution supplied through the neutralized water solution supply pipe 330 are bubbled to decompose fine dust, ozone and the like. The by-products are dissolved in the neutralized water solution and purified, and the air pushed upward is transferred to another divided space through the pumping pipe 360 and purified again through a bubbling process, and then the purified air is discharged through the outlet 370 formed at the top. Air purifier, characterized in that exhausted through.
3. The method of claim 1,

   The porous member 321 is an air purifier, characterized in that made of a ceramic foam or sponge made from at least one selected from natural minerals, ceramics and mixtures thereof.
4. The method of claim 1,

   In the ozone and decomposition by-product removal chamber 300, air from which bacteria and odor-generating substances are removed is brought into contact with a solution of the powdery metal catalyst 310, and is supplied through a process air inlet pipe 340 or an air supply pipe 320. The fine bubbles formed by the compressed air and the neutralized water solution supplied through the neutralized water solution supply pipe 330 are bubbled, so that fine dust, ozone, and decomposition by-products are dissolved and purified in the neutralized water solution, and the purified water is pushed upward. An air purifier characterized in that it acts as a liquid filter that removes ozone by allowing air to be exhausted through an outlet (370) formed at the top.
5. a) supplying atmospheric air containing bacteria and odor-generating substances into the module;

   b) Plasma is brought into contact with the inflowing fluid to remove germs and odor-generating substances.

   plasma treatment step;

   c) an ozone concentration measurement step of measuring concentrations of ozone and decomposition byproducts in the treated air after plasma treatment; and

   d) when the concentration of ozone in the air in the atmosphere in step c) is equal to or higher than the set concentration, it contacts the powdery metal catalyst solution to remove ozone remaining in the air in the atmosphere using a hydroxyl radical;

   The fine bubbles formed by the pressurized air supplied through the treatment air inlet pipe 340 or the air supply pipe 320 and the neutralized water solution supplied through the neutralized water solution supply pipe 330 are bubbled to form fine dust, ozone, and decomposition by-products. Dissolving in a neutralized water solution to purify, and dissociating fine dust ozone and decomposition by-products that exhaust the purified air through an outlet 370 formed thereon.

Images