CN202666618U - Compound air purifying device - Google Patents

Abstract

The utility model relates to a compound air purifying device, and belongs to the technical field of air purification. The compound air purifying device is divided into three-level filtration. The first level filtration is a primary-effect filter (1), the second level filtration is collaborated effect filtration of low-temperature plasma, nanometer titanium dioxide and double-waveband ultraviolet catalytic agents, and the third level filtration is an efficient filter (4). The second level filtration comprises a low-temperature plasma body structure, a polymerization macromolecule composite membrane and titanium dioxide catalyst coated membrane (15), and a double-waveband ultraviolet lamp (3). The low-temperature plasma body structure and the structure of the polymerization macromolecule composite membrane and titanium dioxide catalyst coated membrane (15) are the strong-oxidability nanometer titanium dioxide catalyst coated membrane (15) clamped between needle plate type electrodes, the two electrodes are connected with a high voltage power supply with the voltage between 3 kilovolts to 5 kilovolts and the ground. The low-temperature plasma body structure and a polymerization macromolecule composite membrane and nanometer titanium dioxide catalyst coated membrane (2) are installed on the walls of an air flue through a fixing installation frame (14), the double-waveband ultraviolet lamp (3) is arranged in the middle of the air flue, and a ballast (7) and a transformer (6) of the double-waveband ultraviolet lamp (3) are arranged at the outer wall of the compound air purifying device. The compound air purifying device mainly aims at the treatment of welding fume of a welding plant. The filtering efficiency of the compound air purifying device is obviously improved through the three-level filtration, and air is enabled to be used circularly.

Description

Composite air purification device

technical field

The utility model belongs to the technical field of air purification, in particular to the air purification technology of welding workshops, and is a composite air purification device. the

Background technique

A large amount of volatile organic pollutants (VOCs) and inorganic pollutants such as SO ₂ , NOx, welding fumes, etc. are emitted in welding workshops, threatening human health and the environment on which we live. Traditional air purification technologies such as thermal/catalytic combustion, biological filtration, membrane separation, and selective reduction technologies have disadvantages such as large investment, long cycle time, and high operating costs. For this reason, it is necessary to find innovative composite air purification methods and approaches.

UV oxidation method: the process is simple, can decompose VOCs, the treatment process is short, the efficiency is high, the energy consumption is low, and the scope of application is wide; the disadvantage is that the efficiency of the ultraviolet light emitting tube is low and the residence time is long, and the ultraviolet light can damage the human body. the

Nano-photocatalysis method: using catalysts to oxidize and decompose harmful substances into harmless substances, which can prolong the service life of the purifier; low energy consumption, simple operation, and no secondary pollution. The disadvantage is that the degradation efficiency is relatively low, and the post-processing of the secondary products generated in some cases is more complicated; the activity decreases with time, and subsequent processing is required; the ultraviolet light source used has biological damage. the

Nano-titanium dioxide: Nano-titanium dioxide can generate a large number of hydroxyl radicals under the catalysis of plasma discharge. Under the combined effects of hydroxyl radicals, plasma, ultraviolet radiation, and strong electric field, it can degrade harmful organic substances in the air (such as formaldehyde, toluene, etc.) etc.) and kill germs and viruses. the

Low-temperature plasma purification method: high-frequency and high-voltage current can be used to generate ion fragments, decompose harmful substances under normal temperature and pressure, and improve purification efficiency; the disadvantage is that secondary pollution is easy to occur, and the post-treatment of secondary pollutants is complicated and expensive; The efficiency of energy utilization is relatively low. the

Due to the respective limitations of various technologies, there is currently no most effective method to achieve the purpose of efficiently removing pollutants. the

Contents of the invention

The purpose of this utility model is to provide a purification technology that integrates low-temperature plasma, nano-titanium dioxide and dual-band ultraviolet photocatalyst synergistically. It combines the advantages of each and makes up for the shortcomings of each. It is a brand-new air pollution control technology. . The device can realize the efficient filtration of particulate dust and various suspended solids, the efficient removal of polluted and toxic gases, and the killing of bacteria and viruses at the same time, so as to improve indoor air quality and improve the living environment. the

In order to achieve the above purpose, the technical solution of the utility model is to provide a composite air purification device that integrates low-temperature plasma, nano-titanium dioxide and dual-band ultraviolet photocatalyst synergistic purification technology and multi-stage filtration. It includes primary filter (1), pin-plate low-temperature plasma generator (2), dual-band ultraviolet lamp (3), high-efficiency filter (4), fan (5), transformer (6), and ballast (7), base (8). The device has an air duct structure, an air-inducing fan (5) is installed at the air outlet, and an air purification device is installed in the air duct. The air composite purification device is divided into three stages of filtration. The device (1) is a combination of six cylindrical primary filters; the second stage is low-temperature plasma, nano-titanium dioxide and dual-band ultraviolet photocatalyst synergistic filtration (2 and 3); the third stage is a high-efficiency filter ( 4). The second-stage filtration is a low-temperature plasma structure, a polymer composite membrane, a nano-titanium dioxide catalytic membrane (15), and a dual-band ultraviolet light lamp (3). Among them, the structure of the low-temperature plasma electrode structure, polymer composite film and nano-titanium dioxide catalytic film (15) is a pin-plate structure, and between the pin-plate electrodes is a nano-titanium dioxide catalytic film (15) with strong oxidative properties. The film (15) is a nano-titanium dioxide film supported on an activated carbon net, and the thickness of the nano-titanium dioxide catalytic film is 2-5 mm. The discharge end of the needle electrode (10) is processed into a needle-point shape and is made of metallic nickel. The negative plate in the low-temperature plasma structure is a hole-shaped electrode made of transparent inorganic glass. Low-temperature plasma electrode structure, polymer composite film and nano-titanium dioxide catalytic membrane structural plate, two structural plates are placed in parallel, and the included angle with the axis of the horizontal air duct is 45°. The two electrode plates are connected to 3kV-5kV high-voltage power supply and ground, and the low-temperature plasma electrode structure, polymer composite film and nano-titanium dioxide catalytic film (2) are installed on the four walls of the air duct through the fixed frame (14); the dual-band ultraviolet The light lamp (3) is long-wave UVA plus short-wave UVC, and is installed in the middle of the air duct; the ballast (7) and transformer (6) are arranged on the outer wall of the device. An electrode with a needle-plate structure, wherein the positive plate is parallel needles evenly arranged on the insulating wire (12), and the needle points point to the negative plate. There is a layer of polymer composite film in front of the negative plate. The polymer composite film is made of polyvinyl fluoride, aromatic It is compounded by polymerizing film of tetra-acid dianhydride, organic silicon and aromatic diamine and mica. The positive pole of the high-voltage power supply is connected through the lead wire (18); the positive plate uses the tip of the needle to discharge, and the discharge needle is arranged on an insulated wire in order to fully utilize the energy of the dual-band ultraviolet light source on the positive side. The negative plate is a hole plate structure, and is connected to the negative pole (ground) of the high-voltage power supply through the lead wire (17). the

The principle of the utility model is: when the polluted and harmful gas passes through the needle-shaped structure electrode, the needle-shaped electrode performs low-temperature plasma discharge, and the gas molecules are broken into fragments and small molecules under the impact of high-energy electrons in the low-temperature plasma, and then are Adsorbed on the photocatalytic material to provide a pre-enrichment process for the photocatalytic process; at the same time, under the action of low-temperature plasma discharge, nano-titanium dioxide can generate a large number of hydroxyl radicals with strong oxidation ability, which can quickly and effectively decompose of various harmful substances. The dual-band ultraviolet light shines on the photocatalytic material through transparent inorganic glass, and a catalytic reaction occurs, which avoids the possibility of easily producing intermediate products larger than the original molecule when purely using low-temperature plasma for purification. The bulk-induced photocatalysis generates electron-holes to redox and purify the gas molecules, so that the gas molecules are completely degraded and destroyed, and at the same time, the active adsorption sites of the photocatalytic materials are regenerated in situ. In this way, a low-temperature plasma purification-photocatalytic material adsorption and photocatalytic degradation-photocatalytic material active site regeneration in situ are realized. the

The beneficial effects of the utility model are: combining low-temperature plasma, nano-titanium dioxide and dual-band ultraviolet photocatalyst synergistic purification technology, using the adsorption of activated carbon to concentrate harmful gases on the surface of the catalyst to a specific high concentration, In this way, the photocatalytic oxidation reaction rate of pollutants is improved, and at the same time, activated carbon can also adsorb intermediate by-products to be further photocatalytically oxidized, so that the pollutants adsorbed on the surface of activated carbon can be oxidized and decomposed, so that activated carbon can achieve active adsorption regeneration. Purpose. This not only improves the removal efficiency of harmful gases, but also prolongs the service life of activated carbon. Combining low-temperature plasma technology with nano-titanium dioxide and dual-band ultraviolet photocatalyst synergistic technology, high-energy plasma can not only oxidize and decompose harmful gases, but also further stimulate the surface of the catalyst to generate hydroxyl functional groups, completely improving the ability of oxidative decomposition of harmful gases . the

Description of drawings

Figure 1. Schematic diagram of the primary filter structure;

Figure 2. Schematic diagram of the structure of the pin-plate low-temperature plasma electrode and the side of the catalyst membrane;

Figure 3. Schematic diagram of the structure of the pin-plate low-temperature plasma electrode and the front of the catalyst membrane;

Figure 4. Schematic diagram of the structure of the pin-plate low-temperature plasma electrode and the gas flow in the catalyst film;

Figure 5. Schematic diagram of the composite air purification device.

In Fig. 5, 1. Primary effect filter, 2. Needle-plate type isothermal plasma generator, 3. Dual-band ultraviolet light, 4. High-efficiency filter, 5. Induced draft fan, 6. Transformer, 7. Ballast, 8 , base. the

In Fig. 2, 9, fixing bolt, 10, needle-shaped electrode, 11, polymer composite film, 12, positive plate in the low-temperature plasma electrode structure, 13, insulating wire, 14, fixed frame, 15, catalyst film, 16. Negative plate in low temperature plasma electrode structure 17. Negative lead wire, 18. Positive lead wire. the

Detailed ways

As shown in Figure 1, it is a composite air purification device, the air duct is a rectangular air duct, and the polluted and harmful gases are introduced into the composite purification unit through the induced draft fan (5) (the composite purification unit 1 is the primary filter, and the composite purification unit 2 is the low-temperature plasma , nano-titanium dioxide and dual-band ultraviolet photocatalyst synergistic purification structure, the composite purification unit 3 is a high-efficiency filter.). First of all, PM10 above 5 μm and most of welding dust can be removed by the first-stage filtration of polluted and harmful gases. Then, the polluted and harmful gases that have been filtered once are introduced into the second stage of filtration. First, under the condition of high-frequency pulse discharge, the ground state gas obtains enough energy to ionize and oxidize bacteria, viruses, and TVOC substances in the air; The radiation of light waves is activated to generate free ions, electrons and holes, thereby decomposing carbon monoxide, nitrogen oxides, hydrocarbons, aldehydes, benzene and various harmful substances in the air, and catalytically decomposing and reducing them into environmentally friendly pollution-free H ₂ O and CO ₂ . Finally, it enters the third stage of filtration. This stage is mainly to remove particulate dust, microorganisms and various suspended solids above 0.3μm in the air, and at the same time, further purify the by-products after the previous stages of air purification devices.

Claims (10)

1. Composite air purification device, the device is an air duct structure, an air-inducing fan (5) is installed at the air outlet, and an air purification device is arranged in the air duct. It is characterized in that: the air composite purification device is divided into three stages of filtration, the first The first stage is primary filter (1), the second stage is low-temperature plasma, nano-titanium dioxide and dual-band ultraviolet photocatalyst synergistic filtration (2 and 3), and the third stage is high-efficiency filter (4); The second-stage filtration is low-temperature plasma structure, polymer composite membrane and nano-titanium dioxide catalytic membrane (15), dual-band ultraviolet lamp (3); among them, low-temperature plasma electrode structure, polymer composite membrane and nano-titanium dioxide The structure of the catalytic membrane (15) is a strong oxidizing nano-titanium dioxide catalytic membrane (15) sandwiched between pin-plate electrodes. Composite film and nano-titanium dioxide catalytic film (2) are installed on the four walls of the air duct through a fixed frame (14); the dual-band ultraviolet lamp (3) is installed in the middle of the air duct, and its ballast (7) and transformer (6) Mounted on the outer wall of the device. 2. The composite air purification device according to claim 1, characterized in that: the primary effect filter (1) is a combination of 6 cylindrical primary effect filters. 3. The composite air purification device according to claim 1, characterized in that: the structures of the low-temperature plasma electrode structure, polymer composite film and nano-titanium dioxide catalytic film are pin-plate structures. 4. The composite air purification device according to claim 1, characterized in that: the nano-titanium dioxide catalytic film (15) is a nano-titanium dioxide film supported on an activated carbon mesh. 5. The composite air purification device according to claim 1, characterized in that: the discharge end of the needle-shaped electrode (10) is processed into a needle-point shape. 6. The composite air purification device according to claim 5, characterized in that: the needle electrode (10) is made of metal nickel. 7. The composite air purification device according to claim 1, characterized in that: the negative plate in the low-temperature plasma structure is a hole-shaped electrode made of transparent inorganic glass. 8. The composite air purification device according to claim 1, characterized in that: the thickness of the nano-titanium dioxide catalytic film is 2-5mm. 9. The composite air purification device according to claim 1, characterized in that: the dual-band ultraviolet lamp (3) is long-wave UVA plus short-wave UVC. 10. The composite air purification device according to claim 1, characterized in that: the low-temperature plasma electrode structure, the polymer composite film and the nano-titanium dioxide catalytic membrane structural plate, two structural plates are placed in parallel, and are parallel to the horizontal The included angle of the air duct axis is 45°. the

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