CN110394038A - A device and method for purifying air by using low-temperature plasma to activate water - Google Patents

Abstract

The invention discloses a device and method for purifying air by using low-temperature plasma to activate water, comprising a low-temperature plasma generating device and an activated water atomization device; mechanism; the plasma generating mechanism includes an electrode array plate, a porous electrode column and a barrier medium tube; the electrode array plate includes a connecting plate and an electrode column array group composed of a high-voltage electrode column arranged at the bottom of the connecting plate; A through hole that matches the electrode column, and a barrier medium tube is arranged between the through hole and the high-voltage electrode column; at least two air inlet holes for loading working gas are symmetrically arranged on the upper part of the side wall of the insulating container wall; , fungi can be efficiently inactivated, and the inactivation effect on specific species of fungi is remarkable, and most of the fungi in the air can be efficiently killed (>98.5%) within 30 minutes.

Description

A device and method for purifying air by using low-temperature plasma to activate water

technical field

The invention relates to the technical field of low-temperature plasma, in particular to a device and method for purifying air by activating water with low-temperature plasma.

Background technique

At present, air disinfection often uses ultraviolet radiation and ozone fumigation. Ultraviolet radiation requires that the disinfection site must be fully exposed to ultraviolet light to achieve disinfection, and when used for air disinfection, it requires a suitable temperature of 20°C to 40°C and a relative humidity of less than 80%. , otherwise the bactericidal effect is not good. Ozone fumigation must be carried out indoors under unmanned conditions, and wait at least 30 minutes after disinfection before entering.

The application of low-temperature plasma in the field of air disinfection and sterilization has just started, showing great potential. There have been related researches at home and abroad to directly expose microbial aerosols to low-temperature plasma to achieve microbial inactivation. Due to the high requirements of reaction control technology, it is difficult to achieve complete reaction and easily cause secondary pollution, which makes the direct application of low temperature plasma in the field of air disinfection and sterilization have certain limitations.

In recent years, studies have found that low-temperature plasma-treated water, that is, low-temperature plasma activated water (Plasma activated water, PAW), contains a large number of active particles, mainly reactive oxygen species (Reactive Oxygen Species, ROS), including O ₂ ^- , H ₂ O ₂ , ·HO ₂ , ·OH, etc., and reactive nitrogen species (Reactive Nitrogen Species, RNS), including NO, NO ₂ , ONOO ^- , etc. PAW can be used as a new type of disinfectant to achieve anti-Escherichia coli, Saccharomyces cerevisiae, Staphylococcus epidermidis, Leuconostoc mesenteroides, Hafnia alvei), Staphylococcus aureus (staphylococcus aureus) rapid and efficient inactivation.

Contents of the invention

The object of the present invention is to provide a device and method for purifying air by using low-temperature plasma activated water to solve the above-mentioned problems in the prior art. Harmful by-products can realize broad-spectrum, large-area, and irregular space disinfection and sterilization, expanding the application range of plasma in the field of disinfection and inactivation.

To achieve the above object, the present invention provides the following scheme:

The invention provides a device for purifying air by using low-temperature plasma activated water, including a low-temperature plasma generating device and an activated water atomizing device;

The low-temperature plasma generating device includes a power supply, an injection port, an insulating container, and a plasma generating mechanism arranged inside the insulating container; the plasma generating mechanism includes an electrode array plate, a porous electrode column, and a barrier medium tube; the electrode array The plate is connected to the high-voltage output end of the power supply, and the porous electrode column is connected to the low-voltage input end of the power supply and grounded through a ground wire;

The electrode array plate includes a connection plate and an electrode column array group composed of high-voltage electrode columns arranged at the bottom of the connection plate; through holes suitable for high-voltage electrode columns are distributed in the porous electrode columns, and the through holes A barrier medium pipe is arranged between the hole and the high-voltage electrode column; at least two air inlet holes for loading working gas are arranged symmetrically on the upper side wall of the insulating container wall; the injection port (9) is located at the porous electrode Under the column (3), it is used to spray the low-temperature plasma excited in the through hole of the porous electrode column (3);

The activated water atomization device includes an ultrasonic generator emitting ultrasonic waves upward, an activation chamber and an atomizer located on one side of the activation chamber, and the atomizer is provided with an atomization nozzle for spraying atomized water. Activated water, the upper part of the activation chamber is connected to the injection port, a waterway is provided between the ultrasonic generator and the activation chamber, the waterway is connected to the water inlet, and the waterway and the activation chamber are passed through The fence boards are separated, and there are several small holes for water inlet on the fence boards.

Further, the power supply is a high-frequency high-voltage AC power supply with a frequency range of 6-19KHz, a power of 11-95W, and an output voltage of 11-45kV.

Further, the high voltage electrode array, high voltage electrode and porous electrode column are made of metal, and the barrier medium tube is made of insulating material.

Further, the barrier medium pipe is made of glass, quartz, ceramic or thin enamel.

Further, the working gas is argon, helium, oxygen, air or a mixture thereof.

Further, the flow rate of the working gas is 8-15L/min.

The present invention also provides a method for purifying air by using the low-temperature plasma activated water prepared by the above-mentioned device, comprising the following steps:

(1) Pass in the working gas, and after the gas flow is stable, start the power supply to activate the low-temperature plasma generating device;

(2) Adjust the angle of the injection port so that the injection port and the sterile water surface in the activation chamber are at an angle of 45-75°;

(3) Start the activated water atomization device, pass in sterile water, and make the spray form a parabolic mist at an angle of 55° from the atomization nozzle to achieve the effect of purifying the air.

Further, the spatial concentration of the spray is 100-300mL/m ³ .

The invention discloses the following technical effects:

The device of the present invention utilizes low-temperature plasma to activate water to purify air, and can generate large-size, long-distance, room-temperature The generated plasma can observe multi-pulse discharge current, and the flame is stable without arc discharge. The intensity can be adjusted by changing the high-voltage power supply voltage, and the length can be adjusted by changing the flow rate of the working gas. The temperature of the generated low-temperature plasma measured by an infrared thermometer (GM900, Benetech) is 30-35°C, which can be touched by the human body, which makes it have greater application prospects.

There is a gap between the high-voltage electrode of the present invention and the blocking medium pipe for the flow of the working gas. The porous electrode column is used to disperse the working gas flow into several parts, which can make the working gas flow more uniform. Matched high-voltage electrode excitation, compared with the traditional single electrode, the low-temperature plasma prepared by the present invention has a lower temperature, and the low-temperature plasma-activated water obtained by the treatment has a minimum pH of 3.4 and an oxidation-reduction potential value of 543.2mV. The NO ₂ ^- content was 8.35 μM, the NO ₃ ^- content was 2.95 μM, and the H ₂ O ₂ content was 86.24 μM. After standing for 5 days, the pH value of the low-temperature plasma-activated water stabilized at about 3.40, and the oxidation-reduction potential value dropped slightly to _527.7mV . ^- content continued to decrease to nM level, NO ₃ ^- content increased to 14.41 μM, and H ₂ O ₂ content continued to decrease to 67.55 μM.

The atomized activated water produced by the device using low-temperature plasma activated water to purify air can effectively inactivate bacteria and fungi, and has a significant inactivation effect on specific species of fungi, and can efficiently kill most of the fungi in the liquid within 1 minute ( >85.2%), after 30 minutes, the fungal hyphae and spores were "etched" and "flattened", the cell membrane and cell wall were ruptured, the cytoplasm was released, and the cells could not maintain structural stability and cell membrane permeability, eventually leading to metabolic disorder and necrosis Even apoptosis. The inactivation mechanism of atomized activated water is mainly the decomposition and oxidation of NO ₂ ^- /HNO ₂ under acidic conditions to finally generate cytotoxic substances NO·,·OH, and the strong oxidation of H ₂ O ₂ and high redox potential value synergy of properties.

In the process of preparing activated water, the invention sprays the aseptic water at an angle of 45-75°, and the low-temperature plasma is obliquely injected into the aseptic water, causing the trickle movement of the aseptic water, through excitation, ionization, recombination, redox or decomposition Plasma reactions, such as plasma reactions, make Ar, O ₂ , N ₂ , H2O in the ambient air react with each other to generate a large amount of ROS and RNS, which play a role similar to "cavitation" in sterile water, which can increase the redox potential value and increase The content of active particles enhances the killing effect on bacteria and fungi.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the schematic diagram of low temperature plasma generator of the present invention;

Fig. 2 is a schematic diagram of the structure of a porous electrode column;

Figure 3 is a schematic diagram of the fence structure;

Figure 4 is a schematic diagram of the multilayer structure of the barrier medium pipe in the embodiment;

Among them, 1-power supply, 2-electrode array plate, 3-porous electrode column, 4-insulating container, 5-grounding wire, 6-air intake hole, 7-high voltage electrode column, 8-blocking medium tube, 9-injection port , 10-ultrasonic generator, 11-water inlet, 12-column, 13-atomizer, 14-waterway, 15-small hole, 16-activation chamber, 17-atomization nozzle.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The invention provides a device for purifying air by using low-temperature plasma activated water, including a low-temperature plasma generating device and an activated water atomizing device;

The low-temperature plasma generating device includes a power supply 1, an injection port 9, an insulating container 4, and a plasma generating mechanism disposed inside the insulating container 4; the plasma generating mechanism includes an electrode array plate 2, a porous electrode column 3, and a barrier medium Tube 8; there are wire holes for wires to pass through on the insulating container 4, the electrode array plate 2 is connected to the high-voltage output end of the power supply 1 through the wire holes, and the porous electrode column 3 is connected to the high-voltage output end of the power supply 1 through the wire holes. Connected to the low-voltage input terminal of the power supply 1 and grounded through the ground wire 5;

The electrode array plate 2 includes a connection plate and an electrode column array group composed of high-voltage electrode columns 7 arranged at the bottom of the connection plate; the porous electrode columns 3 are distributed with through holes that are compatible with the high-voltage electrode columns 7 A barrier medium pipe 8 is arranged between the through hole and the high-voltage electrode column 7; at least two inlet holes 6 for loading working gas are arranged symmetrically on the upper part of the side wall of the insulating container 4; The injection port 9 is located under the porous electrode column 3, and is used to inject the low-temperature plasma excited in the through hole of the porous electrode column 3;

The activated water atomization device comprises an ultrasonic generator 10 emitting ultrasonic waves upward, an activation cavity 16 and an atomizer 13 positioned at one side of the activation cavity 16, and the atomization nozzle 17 is arranged on the atomizer 13 for use in After spraying atomized activated water, the upper part of the activation chamber 16 is connected to the injection port 9, and a waterway 14 is arranged between the ultrasonic generator 10 and the activation chamber 16, and the waterway 14 is connected to the water inlet 11. The waterway 14 is separated from the activation chamber 16 by a fence 12, and there are several small holes 15 for water inlet on the fence 12.

In the above technical solution, the power supply is a high-frequency high-voltage AC power supply with a frequency range of 6-19KHz, a power of 11-95W, and an output voltage of 11-45kV.

In the above technical solution, the high-voltage electrode array plate, the high-voltage electrode and the porous electrode column are made of metal, and the barrier medium tube is made of insulating material.

In the above technical solution, the barrier medium tube is made of glass, quartz, ceramic or thin enamel.

In the above technical solution, the barrier medium pipe has a composite layer structure, and the composite layer structure can be set to three or more layers. In the embodiment of the present invention, the composite layer structure is a five-layer structure, which is quartz from the outside to the inside. , glass, ceramics, thin enamel and quartz, with a small interval between each layer, and a connector with the same material as the inner layer at both ends of the barrier medium tube, and a pit on the inner surface of each layer of barrier medium tube, the pit It can be a regular pit, that is, the pit is conical, and the diameter and height of the cone are one-tenth of the diameter of the high-voltage electrode, or the pit can be an irregular pit. This composite layer structure can avoid When the arc occurs, when a high-voltage alternating current is applied to the high-voltage electrode, a large number of tiny fast pulse discharge channels (micro-discharge) appear in the discharge gap, and charges are accumulated on each surface of the composite barrier medium to form an electric field opposite to the direction of the external electric field, weakening the limit discharge Current, pulse discharge current is often used as the basis for judging dielectric barrier discharge; in the discharge gap, photons, electrons, ground state atoms (or molecules), excited state atoms (or molecules), positive ions and negative ions generated by the activated working gas are The main component that reacts with the object being handled.

In the above technical solution, the working gas is argon, helium, oxygen, air or a mixture thereof.

In the above technical solution, the flow rate of the working gas is 8-15L/min.

The present invention also provides a method for purifying air by using the low-temperature plasma activated water prepared by the above-mentioned device, comprising the following steps:

(1) Pass in the working gas, and after the gas flow is stable, start the power supply to activate the low-temperature plasma generating device;

(2) Adjust the angle of the injection port so that the injection port and the sterile water surface in the activation chamber are at an angle of 45-75°;

(3) Start the activated water atomization device, pass in sterile water, make the spray form a parabolic mist at an angle of 55° from the atomization nozzle, and make the space concentration 100-300mL/m ³ to achieve the effect of purifying the air.

Example 1

A device for purifying air by using low-temperature plasma to activate water, including a low-temperature plasma generating device and an activated water atomization device;

The low-temperature plasma generating device includes a power supply, an injection port, an insulating container, and a plasma generating mechanism arranged inside the insulating container; the plasma generating mechanism includes an electrode array plate, a porous electrode column, and a barrier medium tube; the insulating container There are wire holes for wires to pass through. The electrode array plate is connected to the high-voltage output end of the power supply with wires through the wire holes, and the porous electrode column is connected to the low-voltage input end of the power supply with wires through the wire holes. Grounding wire grounding;

The electrode array plate includes a connection plate and an electrode column array group composed of high-voltage electrode columns arranged at the bottom of the connection plate; through holes suitable for high-voltage electrode columns are distributed in the porous electrode columns, and the through holes A barrier medium pipe is arranged between the hole and the high-voltage electrode column; at least two air inlet holes for loading working gas are symmetrically arranged on the upper part of the side wall of the insulating container wall; the injection port is located under the porous electrode column, It is used to spray the low-temperature plasma excited in the through hole of the porous electrode column; the activated water atomization device includes an ultrasonic generator emitting ultrasonic waves upward, an activation chamber and an atomizer located on one side of the activation chamber. The atomizer is provided with an atomizing nozzle for spraying atomized activated water, the upper part of the activation chamber is connected with the injection port, a waterway is provided between the ultrasonic generator and the activation chamber, the The waterway is connected with the water inlet, and the waterway is separated from the activation chamber by a fence, and there are several small holes for water inlet on the fence.

Among them, the power supply is a high-frequency high-voltage AC power supply with a frequency range of 16KHz, a power of 65W, and an output voltage of 40kV.

The high voltage electrode array plate, high voltage electrode and porous electrode post are made of copper.

The barrier dielectric tube is a composite layer structure, the composite layer structure is a five-layer structure, from the outside to the inside are quartz, glass, ceramics, thin enamel and quartz, a small interval is set between each layer, and the inner surface of each layer of barrier medium tube is equipped with The pit, the pit is a regular pit, that is, the pit is conical, and the diameter and height of the cone are respectively one-tenth of the diameter of the high-voltage electrode.

The working gas is an equal-volume mixed gas of argon, helium, and oxygen.

The working gas flow rate is 13L/min.

The present invention also provides a method for purifying air by using the low-temperature plasma activated water prepared by the above-mentioned device, comprising the following steps:

(1) Pass in the working gas, and after the gas flow is stable, start the power supply to activate the low-temperature plasma generating device;

(2) Adjust the angle of the injection port so that the injection port and the sterile water surface in the activation chamber are at an angle of 55°;

(3) Start the activated water atomization device, pass in sterile water, make the spray form a parabolic mist at an angle of 55° from the atomization nozzle, and make the space concentration 200mL/m ³ to achieve the effect of purifying the air.

Example 2

A device for purifying air by using low-temperature plasma to activate water, including a low-temperature plasma generating device and an activated water atomizing device;

The low-temperature plasma generating device includes a power supply, an injection port, an insulating container, and a plasma generating mechanism arranged inside the insulating container; the plasma generating mechanism includes an electrode array plate, a porous electrode column, and a barrier medium tube; the insulating container There are wire holes for wires to pass through. The electrode array plate is connected to the high-voltage output end of the power supply with wires through the wire holes, and the porous electrode column is connected to the low-voltage input end of the power supply with wires through the wire holes. Grounding wire grounding;

The electrode array plate includes a connection plate and an electrode column array group composed of high-voltage electrode columns arranged at the bottom of the connection plate; through holes suitable for high-voltage electrode columns are distributed in the porous electrode columns, and the through holes A barrier medium pipe is arranged between the hole and the high-voltage electrode column; at least two air inlet holes for loading working gas are symmetrically arranged on the upper part of the side wall of the insulating container wall; the injection port is located under the porous electrode column, For spraying low-temperature plasma excited in the through-hole of the porous electrode column;

The activated water atomization device includes an ultrasonic generator emitting ultrasonic waves upward, an activation chamber and an atomizer located on one side of the activation chamber, and the atomizer is provided with an atomization nozzle for spraying atomized water. Activated water, the upper part of the activation chamber is connected to the injection port, a waterway is provided between the ultrasonic generator and the activation chamber, the waterway is connected to the water inlet, and the waterway and the activation chamber are passed through The fence boards are separated, and there are several small holes for water inlet on the fence boards.

Among them, the power supply is a high-frequency high-voltage AC power supply with a frequency range of 6KHz, a power of 95W, and an output voltage of 11kV.

The high voltage electrode array plate, high voltage electrode and porous electrode post are made of copper.

The barrier dielectric tube is a composite layer structure, the composite layer structure is a four-layer structure, from the outside to the inside are quartz, glass, ceramics, thin enamel, a small interval is set between each layer, and the inner surface of each layer of barrier medium tube is uniformly distributed An uneven surface formed by conical pits; the diameter and height of the cone are each one-tenth the diameter of the high-voltage electrode.

The working gas is helium.

The working gas flow rate is 15L/min.

The present invention also provides a method for purifying air by using the low-temperature plasma activated water prepared by the above-mentioned device, comprising the following steps:

(1) Pass in the working gas, and after the gas flow is stable, start the power supply to activate the low-temperature plasma generating device;

(2) Adjust the angle of the injection port so that the injection port and the sterile water surface in the activation chamber are at an angle of 45°;

(3) Start the activated water atomization device, pass in sterile water, make the spray form a parabolic mist at an angle of 55° from the atomization nozzle, and make the space concentration 300mL/m ³ to achieve the effect of purifying the air.

Example 3

A device for purifying air by using low-temperature plasma to activate water, including a low-temperature plasma generating device and an activated water atomizing device;

The low-temperature plasma generating device includes a power supply, an injection port, an insulating container, and a plasma generating mechanism arranged inside the insulating container; the plasma generating mechanism includes an electrode array plate, a porous electrode column, and a barrier medium tube; the insulating container There are wire holes for wires to pass through. The electrode array plate is connected to the high-voltage output end of the power supply with wires through the wire holes, and the porous electrode column is connected to the low-voltage input end of the power supply with wires through the wire holes. Grounding wire grounding;

The electrode array plate includes a connection plate and an electrode column array group composed of high-voltage electrode columns arranged at the bottom of the connection plate; through holes suitable for high-voltage electrode columns are distributed in the porous electrode columns, and the through holes A barrier medium pipe is arranged between the hole and the high-voltage electrode column; at least two air inlet holes for loading working gas are symmetrically arranged on the upper part of the side wall of the insulating container wall; the injection port is located under the porous electrode column, For spraying low-temperature plasma excited in the through-hole of the porous electrode column;

The activated water atomization device includes an ultrasonic generator emitting ultrasonic waves upward, an activation chamber and an atomizer located on one side of the activation chamber, and the atomizer is provided with an atomization nozzle for spraying atomized water. Activated water, the upper part of the activation chamber is connected to the injection port, a waterway is provided between the ultrasonic generator and the activation chamber, the waterway is connected to the water inlet, and the waterway and the activation chamber are passed through The fence boards are separated, and there are several small holes for water inlet on the fence boards.

Among them, the power supply is a high-frequency high-voltage AC power supply with a frequency range of 19KHz, a power of 11W, and an output voltage of 45kV.

The high voltage electrode array plate, high voltage electrode and porous electrode post are made of copper.

The barrier dielectric tube is a composite layer structure, the composite layer structure is a three-layer structure, from the outside to the inside are quartz, glass and quartz, a small interval is set between each layer, and the inner surface of each barrier medium tube is provided with pits. The pit is a regular pit, that is, the pit is conical, and the diameter and height of the cone are respectively one-tenth of the diameter of the high-voltage electrode.

The working gas is argon.

The working gas flow rate is 8L/min.

The present invention also provides a method for purifying air by using the low-temperature plasma activated water prepared by the above-mentioned device, comprising the following steps:

(1) Pass in the working gas, and after the gas flow is stable, start the power supply to activate the low-temperature plasma generating device;

(2) Adjust the angle of the injection port so that the injection port and the sterile water surface in the activation chamber are at an angle of 75°;

(3) Start the activated water atomization device, pass in sterile water, make the spray form a parabolic mist at an angle of 55° from the atomization nozzle, and make the space concentration 100mL/m ³ to achieve the effect of purifying the air.

Comparative example 1

The difference from Example 1 is that there is no pit inside the barrier medium tube of Comparative Example 1.

Comparative example 2

The difference from Example 1 is that the barrier dielectric tube of Comparative Example 2 is a single layer of quartz and has the same pit structure as that of Example 1.

Comparative example 3

The difference from Example 1 is that the porous electrode column of Comparative Example 3 has only one hole, and correspondingly, the high-voltage electrode array plate of Comparative Example 3 also has only one high-voltage electrode column.

experiment:

The working area of the 304L indoor ultra-clean workbench was used as the exposure chamber. After ultraviolet disinfection of the exposure chamber for 20 minutes, the glass door was opened to exchange the exposure chamber with indoor air for 1 hour, and the glass door was closed to seal the exposure chamber to start collecting background group samples. Open the glass door to exchange the exposure cabin with the indoor air for 1 hour, place the device for purifying air by using low-temperature plasma activated water in Example 1-3 and Comparative Example 1-3 in the exposure cabin, close the glass door to seal the exposure cabin 30 min after starting the device for purifying air with water activated by low-temperature plasma (the volume of sterile water is 75 mL), samples from the exposure group were collected. Open the glass door to exchange the exposure cabin with the indoor air for 1 hour, place the device that uses low-temperature plasma activated water to purify the air in the exposure cabin, close the glass door to seal the exposure cabin, do not start the low-temperature plasma emission device, and only activate the activated water After the atomization device atomized sterile water (volume 75mL) for 30 minutes, samples from the control group were collected. Fungal aerosols were collected using two different methods, the plate natural sedimentation method and the BioStage sampler (SKCInc., Eighty-Four, PA, USA), and the results are shown in Table 1, where the inactivation efficiency shown was based on the control group benchmark.

Table 1

The above results show that the inactivation efficiency is greater than 90% by using the low-temperature plasma to activate the activity and stability of water, and using the atomization method to treat the air fungal aerosol. If the contact time and relative concentration of low-temperature plasma-activated water and ambient air are increased, it will have a significant impact on improving the inactivation efficiency. Compared with the traditional air sterilization and disinfection method, the low-temperature plasma atomization disinfection method ensures the penetration and disinfection effect on more complicated and difficult-to-reach places, the disinfection process takes a short time, and there is no noise or ultrasonic pollution in the process.

The above-mentioned embodiments are only to describe the preferred mode of the present invention, not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (8)

1. A device for purifying air utilizing low-temperature plasma activated water, characterized in that it comprises a low-temperature plasma generating device and an activated water atomization device; The low-temperature plasma generating device includes a power supply (1), an injection port (9), an insulating container (4) and a plasma generating mechanism arranged inside the insulating container (4); the plasma generating mechanism includes an electrode array plate ( 2), a porous electrode column (3) and a barrier medium tube (8); the electrode array plate (2) is connected to the high voltage output end of the power supply (1), and the porous electrode column (3) is connected to the power supply The low voltage input terminal of (1) is connected and grounded through the ground wire (5); The electrode array plate (2) includes a connection plate and an electrode column array group composed of high-voltage electrode columns (7) arranged at the bottom of the connection plate; the porous electrode column (3) is distributed with high-voltage electrode columns ( 7) A suitable through hole, a barrier medium pipe (8) is arranged between the through hole and the high-voltage electrode column (7); at least two symmetrically arranged on the upper side wall of the insulating container wall (4) An air inlet (6) for loading working gas; the injection port (9) is located under the porous electrode column (3), and is used to inject low-temperature plasma excited in the through hole of the porous electrode column (3); The activated water atomization device comprises an ultrasonic generator (10) emitting ultrasonic waves upwards, an activation chamber (16) and an atomizer (13) positioned at one side of the activation chamber (16), the atomizer (13 ) is provided with an atomizing nozzle (17) for spraying activated water after atomization, the upper part of the activation chamber (16) communicates with the injection port (9), the ultrasonic generator (10) and the A waterway (14) is arranged between the activation chamber (16), and the waterway (14) communicates with the water inlet (11). ) separated by some apertures (15) for water inlet on the slab (12). 2. The device for purifying air by using low-temperature plasma activated water according to claim 1, wherein the power supply is a high-frequency high-voltage AC power supply, the frequency range is 6-19KHz, the power is 11-95W, and the output voltage is 11-45kV. 3. the device utilizing low-temperature plasma activated water to purify air according to claim 1, characterized in that, said high-voltage electrode array plate (2), high-voltage electrode (7) and porous electrode post (3) are metal materials, The barrier medium pipe (8) is made of insulating material. 4. The device for purifying air by activating water with low-temperature plasma according to claim 3, characterized in that, the barrier medium pipe (8) is made of glass, quartz, ceramics or thin enamel. 5. The device for purifying air by using low-temperature plasma to activate water according to claim 1, wherein the working gas is argon, helium, oxygen, air or a mixture thereof. 6. The device for purifying air by using low-temperature plasma to activate water according to claim 1, characterized in that the flow rate of the working gas is 8-15 L/min. 7. A method for purifying air by low-temperature plasma activated water prepared by the device according to any one of claims 1-6, characterized in that, comprising the following steps: (1) Pass in the working gas, and after the gas flow is stable, start the power supply and activate the low-temperature plasma generating device; (2) Adjust the angle of the injection port so that the injection port and the sterile water surface in the activation chamber are at an angle of 45-75°; (3) Start the activated water atomization device, pass in sterile water, and make the spray form a parabolic mist at an angle of 55° from the atomization nozzle to achieve the effect of purifying the air. 8 . The method for purifying air by activating water with low-temperature plasma according to claim 7 , characterized in that the spatial concentration of the spray is 100-300 mL/m ³ .