An air purification device for treating pollutants by generating activated water using plasma

Abstract

The invention provides an air purification device for treating pollutants by using plasma to generate activated water. The device comprises a plasma activated water generating unit, an atomized water generating unit, a plasma discharge unit and an ozone removal unit which are sequentially arranged along the air flow direction; the atomized water generating unit comprises a water tank and an ultrasonic atomizer arranged in the water tank; the plasma activated water generating unit comprises a quartz glass tube which is arranged in the water tank along the vertical direction, a hollow high-voltage electrode is arranged in the quartz glass tube, and a ground electrode is arranged on the periphery of the quartz glass tube; air is generated by forming a gas-liquid mixed medium barrier discharge plasma through the cooperation of the quartz glass tube, the high-voltage electrode and the ground electrode, and activated water is formed in the water tank; the device of the invention makes full use of the advantages of different plasma sources, performs integrated purification on bacteria, viruses, particulate matter and volatile organic matter in indoor air, and effectively purifies indoor air.

Description

Technical Field

[0001] The invention relates to an air purification device, in particular to an air purification device which utilizes plasma to generate activated water to treat pollutants. Background Art

[0002] With the rapid development of modern industry and urbanization, people's living standards have been improved to varying degrees, and the demand for high quality of life has become higher and higher. However, the surrounding environment in which people live is deteriorating, especially air pollution, including indoor air pollution. According to surveys, each person spends at least half of his time indoors on average, and the elderly, children, pregnant women and patients spend more time indoors, and have higher requirements for air quality. There are three main types of indoor air pollution: solid particles, such as smoke, pollen and dust; microorganisms, such as viruses, bacteria, spores and fungi; and volatile harmful gases, such as formaldehyde and toluene.

[0003] Since the indoor air treatment method is very different from the industrial waste gas treatment method and requires to be carried out at normal temperature and pressure, advanced oxidation technology has become a commonly used method. Among them, the more commonly used methods are photocatalysis technology, adsorption filtration method and plasma method. For photocatalysis technology, under the irradiation of ultraviolet light, the photocatalyst can decompose volatile harmful gases into harmless small molecular gases, but due to the low concentration of volatile harmful gases in indoor air, the removal effect of photocatalysis is not very ideal; the adsorption filtration method mainly uses activated carbon and molecular sieves to filter and treat pollutants to achieve the purpose of purification, but the adsorption material has a certain adsorption capacity. After using it for a period of time and reaching the maximum adsorption capacity of the adsorption material, the adsorption material will lose its adsorption function and it is easy to cause secondary pollution to the air. Most of the current mainstream air purifiers use adsorption filters to purify the air, so customers must frequently replace and clean the filters, which is more cumbersome.

[0004] The plasma method treats air pollutants through plasma discharge. There are two main types of plasma suitable for indoor air treatment according to the discharge method: corona discharge and dielectric barrier discharge. Corona discharge is generally suitable for the treatment of particulate matter and microorganisms. Due to the weak discharge, the treatment effect on volatile organic compounds is average. The current corona discharge generally uses a single positive corona or negative corona, lacking positive and negative coronas, that is, lacking the process of solid particle growth; dielectric barrier discharge is more suitable for the treatment of volatile organic compounds, but has almost no treatment effect on solid particles. The dielectric barrier discharge currently used in indoor purifiers Discharge generally uses air as the discharge gas. The main effect of air discharge on treating pollutants is ozone. Ozone is a broad-spectrum bactericide that has a good removal effect on volatile harmful gases and bacterial microorganisms. However, when the ozone concentration exceeds a certain standard, it will cause certain harm to the human body. Therefore, many plasma air technologies now use plasma generators that produce as little ozone as possible. The reduction in ozone production will definitely weaken the effect of air purification. In addition, this method still makes it difficult to ensure that the ozone content produced by the plasma air purifier exceeds the standard after working in a closed indoor environment for a long time. Summary of the invention

[0005] The object of the present invention is to provide an air purification device which utilizes plasma to generate activated water to treat pollutants, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An air purification device for treating pollutants by using plasma to generate activated water comprises a plasma activated water generating unit, an atomized water generating unit, a plasma discharge unit and an ozone removal unit which are sequentially arranged along the air flow direction; the atomized water generating unit comprises a water tank and an ultrasonic atomizer arranged in the water tank; the plasma activated water generating unit comprises a quartz glass tube arranged in the water tank along the vertical direction, a hollow high-voltage electrode is arranged in the quartz glass tube, and a ground electrode is arranged on the periphery of the quartz glass tube; the quartz glass tube has an inner and outer layer, and the inner and outer sides of the high-voltage electrode are covered by the inner and outer layers; air is generated by forming a gas-liquid mixed medium barrier discharge plasma through the cooperation of the quartz glass tube, the high-voltage electrode and the ground electrode, and activated water is formed in the water tank, the activated water is mixed with the air entering from the high-voltage electrode, and then activated water mist is formed by the ultrasonic atomizer and transported to the plasma discharge unit.

[0008] As a further solution of the present invention: the gas-liquid mixed dielectric barrier discharge plasma of the plasma activated water generating unit is powered by a high-frequency high-voltage AC power supply or a pulsed high-voltage power supply, the high-voltage end of the power supply is connected to the high-voltage electrode, and the low-voltage end is grounded.

[0009] As a further solution of the present invention: the ground electrode is composed of water and a stainless steel mesh, and a water pump is connected outside the water tank. The outlet of the water pump is adapted to the ground electrode, and water is provided to the ground electrode through the cooperation of the water tank and the water pump.

[0010] As a further solution of the present invention: the plasma discharge unit includes a positive corona discharge zone, an AC corona discharge zone, a negative corona discharge zone and an ion wind discharge zone which are sequentially arranged along the air flow direction.

[0011] As a further solution of the present invention: the positive corona discharge zone is composed of a first needle-shaped electrode and a mesh electrode, and the electrode needles of the first needle-shaped electrode correspond one to one with the mesh holes of the mesh electrode; the positive corona discharge zone is powered by a high-voltage DC power supply, the first needle-shaped electrode is connected to positive high voltage electricity, and the mesh electrode is grounded.

[0012] As a further solution of the present invention: the AC corona discharge zone is composed of several layers of first linear electrodes, the first linear electrodes of each layer are arranged in parallel and equidistantly on a plane, and the lines between layers are arranged vertically; the AC corona discharge zone is composed of second linear electrodes and plate electrodes, the second linear electrodes and the plate electrodes are arranged alternately, and the second linear electrodes of each layer are arranged in parallel and equidistantly on a plane; the negative corona discharge zone is powered by a high-voltage DC power supply, the second linear electrodes are connected to negative high voltage, and the plate electrodes are grounded.

[0013] As a further solution of the present invention: the ion wind discharge area is composed of a second needle-shaped electrode and a ring-shaped electrode, and the central axis of the second needle-shaped electrode coincides with the central axis of the ring-shaped electrode; the ion wind discharge area is powered by a high-voltage DC power supply, the second needle-shaped electrode is connected to negative high voltage, and the ring-shaped electrode is grounded.

[0014] As a further solution of the present invention: the ozone removal unit is an ultraviolet lamp or a catalyst capable of absorbing ozone.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] After the present invention adopts the above structure, the order of the purification channels in the air purification device is the hollow high-voltage electrode, the water tank and the atomization area of ​​the atomized water generating unit, the positive corona area, the AC corona area, the negative corona area, the ion wind area and the ultraviolet area. The ozone that is not utilized in the plasma discharge process is sent into the water, and a step-by-step disinfection method is adopted, which not only effectively utilizes ozone disinfection, but also effectively eliminates the harm of excessive ozone, so that the disinfection is very comprehensive and efficient. Plasma activated water is produced by gas-liquid mixed medium barrier discharge plasma. The activated water is atomized by an ultrasonic atomizer to form activated water mist. After the activated water mist is fully in contact with the gas, it can be sterilized, degrade VOCs and filter and remove dust preliminarily. It is further processed by the positive corona discharge zone, AC corona discharge zone, negative corona discharge zone and ion wind discharge zone in the plasma discharge unit. The positive corona discharge zone charges the activated water mist and particulate matter, the AC corona discharge zone makes the activated water mist and particulate matter PM2.5 grow together, the negative corona discharge zone removes the grown atomized water and particulate matter PM2.5, and the ion wind discharge zone will generate negative ion wind. After passing through the ozone removal unit, pure negative ion wind can be generated and released into the purification space for further purification. This device makes full use of the advantages of different plasma sources to purify bacteria, viruses, particulate matter and volatile organic matter in indoor air in an integrated manner, and effectively purifies indoor air. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the overall structure of an air purification device that uses plasma to generate activated water to treat pollutants.

[0018] Figure 2 The schematic diagram is a structural diagram of a negative corona in an air purification device that uses plasma to generate activated water to treat pollutants.

[0019] Figure 3 This is a partial enlarged view of the negative corona in an air purification device that uses plasma to generate activated water to treat pollutants.

[0020] Figure 4 A side view of a negative corona in an air purification device that uses plasma to generate activated water to treat pollutants.

[0021] Figure 5 A side view of a negative corona in an air purification device that uses plasma to generate activated water to treat pollutants.

[0022] Figure 6 The schematic diagram is a structural diagram of electrocoagulation in an air purification device that uses plasma to generate activated water to treat pollutants.

[0023] Figure 7This is a partial enlarged view of electrocoagulation in an air purification device that uses plasma to generate activated water to treat pollutants.

[0024] Figure 8 A side view of electrocoagulation in an air purification device that uses plasma to generate activated water to treat pollutants.

[0025] Fig. 9 A side view of electrocoagulation in an air purification device that uses plasma to generate activated water to treat pollutants.

[0026] Fig.10 A schematic diagram of a positive corona in an air purification device that uses plasma to generate activated water to treat pollutants.

[0027] Fig.11 This is a partial enlarged view of the positive corona in an air purification device that uses plasma to generate activated water to treat pollutants.

[0028] Fig.12 A side view of a positive corona in an air purification device that uses plasma to generate activated water to treat pollutants.

[0029] Fig.13 A side view of a positive corona in an air purification device that uses plasma to generate activated water to treat pollutants.

[0030] Fig.14 The schematic diagram is a structural diagram of an air purification device that uses plasma to generate activated water to treat pollutants and negative ions.

[0031] Fig.15 This is a partial enlarged view of the negative ions in an air purification device that uses plasma to generate activated water to treat pollutants.

[0032] In the figure: 1. plasma activated water generating unit; 101. quartz glass tube; 102. high voltage electrode; 103. ground electrode; 104. activated water; 105. activated water mist; 2. atomized water generating unit; 201. water tank; 202. ultrasonic atomizer; 203. water pump; 3. plasma discharge unit; 301. positive corona discharge zone; 302. AC corona discharge zone; 303. negative corona discharge zone; 304. ion wind discharge zone; 4. ozone removal unit. DETAILED DESCRIPTION

[0033] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0034] See also Figure 1-15, an air purification device for treating pollutants by using plasma to generate activated water, comprising a plasma activated water generating unit 1, an atomized water generating unit 2, a plasma discharge unit 3 and an ozone removal unit 4 arranged in sequence along the air flow direction; the atomized water generating unit 2 comprises a water tank 201 and an ultrasonic atomizer 202 arranged in the water tank 201, and ultrasonically oscillates the activated water 104 to generate atomization, the oscillation frequency is 1.7MHz, and the atomized water comes from the activated water 104 generated by gas-liquid mixed discharge; the plasma activated water generating unit 1 It includes a quartz glass tube 101 arranged in a water tank 201 along a vertical direction, wherein a hollow high-voltage electrode 102 is arranged in the quartz glass tube 101, and a ground electrode 103 is arranged on the periphery of the quartz glass tube 101; the quartz glass tube 101 has an inner and outer layer, and the inner and outer sides of the high-voltage electrode 102 are covered by the cooperation of the inner and outer layers, so that the inner and outer sides of the high-voltage electrode 102 are covered, and the heat generated by the high-voltage electrode 102 during the discharge process is taken away by the gas in the high-voltage electrode 102 and the water vapor between the high-voltage electrode 102 and the ground electrode 103.

[0035] Air is generated by the cooperation of the quartz glass tube 101, the high-voltage electrode 102 and the ground electrode 103 to form a gas-liquid mixed dielectric barrier discharge plasma, and activated water 104 is formed in the water tank 201. The activated water 104 is mixed with the air entering from the high-voltage electrode 102, and then the ultrasonic atomizer 202 forms an activated water mist 105 and transports it to the plasma discharge unit 3; the plasma activated water generating unit 1 is generated by the gas-liquid mixed dielectric barrier discharge plasma, the high-voltage electrode 102 of the gas-liquid mixed dielectric barrier discharge channel is made of metal or other conductive materials, the high-voltage electrode 102 is coated with an insulating medium, the ground electrode 103 is water and a stainless steel mesh, the number of discharge channels is a natural number greater than 1, and the discharge working gas is air and water vapor; there are two main types of particles generated by the gas-liquid mixed dielectric barrier discharge that are very effective in sterilization and VOCs removal, one type is such as O 3 , H2O2 molecules, and the other is oxygen active groups and nitrogen active groups. The oxygen active groups mainly include 1 O2, OH, nitrogen active groups mainly include ONOO- and NO.

[0036] The gas-liquid mixed dielectric barrier discharge plasma of the plasma activated water generating unit 1 is powered by a high-frequency high-voltage AC power supply or a pulsed high-voltage power supply, the high-voltage end of the power supply is connected to the high-voltage electrode 102, and the low-voltage end is grounded.

[0037] Specifically, the ground electrode 103 is composed of water and a stainless steel mesh, and a water pump 203 is connected to the outside of the water tank 201. The outlet of the water pump 203 is adapted to the ground electrode 103, and water is provided to the ground electrode 103 through the cooperation of the water tank 201 and the water pump 203. The water is both a part of the ground electrode 103 and a liquid part of the gas-liquid mixed discharge. The water comes from the water tank 201 of the atomized water generator and is obtained by pumping by the water pump 203.

[0038] In addition, the plasma discharge unit 3 includes a positive corona discharge area 301, an AC corona discharge area 302, a negative corona discharge area 303 and an ion wind discharge area 304 which are sequentially arranged along the air flow direction.

[0039] Furthermore, the positive corona discharge zone 301 is composed of a first needle-shaped electrode and a mesh electrode, and the electrode needles of the first needle-shaped electrode correspond to the mesh holes of the mesh electrode one by one; the first needle-shaped electrode and the mesh electrode are both made of metal or other conductive materials, and the number of mesh holes of the first needle-shaped electrode and the mesh electrode is a natural number greater than 1; the positive corona discharge zone 301 is powered by a high-voltage DC power supply, the first needle-shaped electrode is connected to positive high voltage, and the mesh electrode is grounded.

[0040] Furthermore, the AC corona discharge zone 302 is composed of several layers of first linear electrodes, the first linear electrodes of each layer are arranged in parallel and equidistantly on a plane, and the lines between layers are arranged vertically, and the number of first linear electrodes in each layer is a natural number greater than 1; the AC corona discharge zone 302 is powered by a high-voltage AC power supply, the frequency of the power supply is 20-100kHz, the first linear electrodes of adjacent layers have opposite polarities, and the first linear electrodes of the same layer have the same polarity.

[0041] Furthermore, the negative corona discharge zone 303 is composed of a second linear electrode and a plate electrode, the second linear electrode and the plate electrode are arranged alternately, each layer of the second linear electrodes is arranged in parallel and equidistantly on a plane, and the number of layers of the second linear electrodes and the number of plate electrodes are natural numbers greater than 1; the negative corona discharge zone 303 is powered by a high-voltage DC power supply, the second linear electrode is connected to negative high voltage, and the plate electrode is grounded.

[0042] Furthermore, the ion wind discharge area 304 is composed of a second needle-shaped electrode and a ring-shaped electrode, the central axis of the second needle-shaped electrode coincides with the central axis of the ring-shaped electrode, and the number of second electrodes and ring-shaped electrodes is a natural number greater than 1; the ion wind discharge area 304 is powered by a high-voltage DC power supply, the second needle-shaped electrode is connected to negative high voltage, and the ring-shaped electrode is grounded.

[0043] Specifically, the ozone removal unit 4 is an ultraviolet lamp or a catalyst capable of absorbing ozone. The light generated by the ultraviolet lamp is 254nm ultraviolet light. The number can be one or more. The working state selects the luminous intensity according to the ozone content at the outlet.

[0044] In this embodiment, the device does not use an adsorption filter, but only uses an air-distributing net, thereby eliminating the trouble of replacing the filter, and the disinfection process is very convenient and energy-saving. During the operation of the device, the devices that generate the main noise are placed inside the sound insulation device, which effectively reduces the noise generated during the disinfection process, and the disinfection process is very quiet.

[0045] The working principle of the present invention is as follows: the order of the purification channels of the device is a hollow high-voltage electrode 102, a water tank 201 and an atomization zone of an atomized water generating unit 2, a positive corona discharge zone 301, an AC corona discharge zone 302, a negative corona discharge zone 303, an ion wind discharge zone 304 and an ultraviolet zone; plasma activated water is generated by a gas-liquid mixed medium barrier discharge plasma, and the generated activated water 104 is atomized by an ultrasonic atomization device to form an activated water mist 105. After the activated water mist 105 is fully in contact with the gas, sterilization, VOCs degradation and preliminary filtration and dust removal can be performed. After passing through four plasma discharge zones, the positive corona zone charges the activated atomized water and particulate matter, the AC corona zone causes the activated atomized water to grow in combination with the particulate matter PM2.5, the negative corona zone removes the grown atomized water and the particulate matter PM2.5, and the ion wind zone generates negative ion wind, which then passes through a deozonation device once to generate pure negative ion wind that is released into the purification space for further purification.

[0046] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. An air purification device for treating pollutants by using plasma to generate activated water, characterized in that: It comprises a plasma activated water generating unit (1), an atomized water generating unit (2), a plasma discharge unit (3) and an ozone removal unit (4) which are arranged in sequence along the air flow direction; The atomized water generating unit (2) comprises a water tank (201) and an ultrasonic atomizer (202) arranged in the water tank (201); The plasma activated water generating unit (1) comprises a quartz glass tube (101) arranged in a water tank (201) along a vertical direction, wherein a hollow high-voltage electrode (102) is arranged in the quartz glass tube (101), and a ground electrode (103) is arranged on the periphery of the quartz glass tube (101); the quartz glass tube (101) has an inner and outer layer, and the inner and outer sides of the high-voltage electrode (102) are covered by the inner and outer layers; air is generated by forming a gas-liquid mixed medium barrier discharge plasma through the cooperation of the quartz glass tube (101), the high-voltage electrode (102) and the ground electrode (103), and activated water (104) is formed in the water tank (201); the activated water (104) is mixed with the air entering from the high-voltage electrode (102), and then the activated water mist (105) is formed by the ultrasonic atomizer (202) and transported to the plasma discharge unit (3); The ground electrode (103) is composed of water and a stainless steel mesh, and a water pump (203) is connected to the outside of the water tank (201). The outlet of the water pump (203) is adapted to the ground electrode (103), and water is provided to the ground electrode (103) through the cooperation of the water tank (201) and the water pump (203); The plasma discharge unit (3) comprises a positive corona discharge area (301), an AC corona discharge area (302), a negative corona discharge area (303) and an ion wind discharge area (304) which are arranged in sequence along the air flow direction; The positive corona discharge zone (301) is composed of a first needle-shaped electrode and a mesh electrode, and the electrode needles of the first needle-shaped electrode correspond one to one with the mesh holes of the mesh electrode; The positive corona discharge zone (301) is powered by a high-voltage DC power supply, the first needle-shaped electrode is connected to the positive high-voltage power, and the mesh electrode is grounded; The AC corona discharge zone (302) is composed of a plurality of layers of first linear electrodes, wherein the first linear electrodes of each layer are arranged in parallel and at equal intervals on a plane and the lines between the layers are arranged vertically; The AC corona discharge zone (302) is powered by a high voltage AC power source, the frequency of the power source is 20-100 kHz, the polarities of the first linear electrodes in adjacent layers are opposite, and the polarities of the first linear electrodes in the same layer are the same; The negative corona discharge area (303) is composed of second linear electrodes and plate-shaped electrodes, the second linear electrodes and the plate-shaped electrodes are arranged alternately, and the second linear electrodes of each layer are arranged in parallel and at equal intervals on a plane; The negative corona discharge zone (303) is powered by a high-voltage DC power supply, the second linear electrode is connected to the negative high voltage, and the plate electrode is grounded; The ion wind discharge area (304) is composed of a second needle-shaped electrode and a ring-shaped electrode, and the central axis of the second needle-shaped electrode coincides with the central axis of the ring-shaped electrode; The ion wind discharge area (304) is powered by a high-voltage direct current power supply, the second needle-shaped electrode is connected to negative high voltage electricity, and the ring-shaped electrode is grounded.

2. The air purification device for treating pollutants by using plasma to generate activated water according to claim 1, characterized in that: The gas-liquid mixed dielectric barrier discharge plasma of the plasma activated water generating unit (1) is powered by a high-frequency high-voltage AC power supply or a pulse high-voltage power supply, the high-voltage end of the power supply is connected to the high-voltage electrode (102), and the low-voltage end is grounded.

3. The air purification device for treating pollutants by using plasma to generate activated water according to claim 1, characterized in that: The ozone removal unit (4) is an ultraviolet lamp or a catalyst capable of absorbing ozone.

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