CN213713416U - Air disinfection purifier based on plasma normal position coupling nanometer catalysis - Google Patents
Air disinfection purifier based on plasma normal position coupling nanometer catalysis Download PDFInfo
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Abstract
The utility model discloses an air disinfection purifier based on plasma normal position coupling nanometer catalysis, which comprises a housin, a power supply, connecting piece and at least one catalysis discharge unit, connecting piece and catalysis discharge unit locate in the casing, the connecting piece is connected with the casing, catalysis discharge unit is connected with the connecting piece, catalysis discharge unit includes first electrode subassembly and the second electrode subassembly that links to each other with the power, produce the plasma field between first electrode subassembly and the second electrode subassembly, be equipped with the nanometer catalyst between first electrode subassembly and the second electrode subassembly, the nanometer catalyst is located in the plasma field, be equipped with air inlet and gas outlet on the casing, air current in the casing is through the plasma field and contact with the nanometer catalyst. The utility model discloses well air disinfection purifier will remove dust, desorption organic pollutant, disinfect the function integration such as disinfection integrative, have energy utilization rate height, bactericidal effect obvious, compact structure is simple, advantage such as complete machine is small.
Description
Technical Field
The utility model belongs to discharge plasma and catalysis field, concretely relates to air disinfection purifier based on catalysis of plasma normal position coupling nanometer.
Background
The indoor air quality is closely related to the health condition of people, and the pollutants causing the indoor air quality reduction are various and comprise particulate matters, organic pollutants, pathogenic microorganisms and the like. Particularly, the severe epidemic situation of pneumonia caused by the outbreak of the novel coronavirus infection makes the air disinfection in public indoor places become the key point of epidemic situation prevention and control.
In recent years, air purifiers based on plasma technology have been widely used, and the principle is to utilize high-energy electrons generated by plasma and O, HO2Free radical active species such as OH and the like have strong bacteria virus inactivation capacity, and the air purifier has the advantages of low working temperature, rich high-activity species, strong particle trapping capacity, simple and easy equipment and the like. However, this type of airThe purifier has more outstanding problems in the aspect of air disinfection and purification, such as high difficulty in efficiently trapping fine particles (such as bioaerosol), easy generation of harmful byproducts such as ozone and nitrogen oxide, secondary pollution and the like. In order to solve the above disadvantages, the commonly adopted method is to construct a multi-stage purification system to treat toxic and harmful substances in indoor air in a grading manner, which can achieve the purpose of high-efficiency disinfection and purification, but involves a multi-stage discharge unit, a byproduct removal unit and the like, so that the device has large volume, high energy consumption and cost and increased maintenance cost.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the proposition of above problem, and research design one kind is based on the catalyzed air disinfection purifier of plasma normal position coupling nanometer, solves traditional air purification device's disinfection purification efficiency lower, the device volume is great, the higher shortcoming of energy consumption and cost. The utility model discloses a technical means as follows:
an air disinfection and purification device based on plasma in-situ coupling nano catalysis comprises a shell, a power supply, a connecting piece and at least one catalytic discharge unit, the connecting piece and the catalytic discharge unit are arranged in the shell, the connecting piece is connected with the shell, the catalytic discharge unit is connected with the connecting piece and comprises a first electrode assembly and a second electrode assembly which are oppositely arranged, the first electrode assembly and the second electrode assembly are both connected to the power supply such that a plasma field is generated between the first electrode assembly and the second electrode assembly, a nano-catalyst is arranged between the first electrode assembly and the second electrode assembly and is arranged in the plasma field, and the shell is provided with an air inlet and an air outlet, and the air flow in the shell passes through the plasma field and contacts with the nano catalyst.
Preferably, the first electrode assembly comprises a plate electrode or a needle electrode or a mesh electrode and the second electrode assembly comprises a plate electrode or a needle electrode or a mesh electrode.
Preferably, first electrode subassembly is needle electrode array, second electrode subassembly is needle electrode array, electrode board or electrode net, the needle interval of needle electrode array is the millimeter level, and needle length is the millimeter level, interval between first electrode subassembly and the second electrode subassembly is the millimeter level, the mesh number of net electrode is 20-40 meshes.
Preferably, the nano-catalyst is filled between the first electrode assembly and the second electrode assembly or coated on the surface of the first electrode assembly and/or the second electrode assembly.
Preferably, the power supply is an alternating current, direct current or pulse power supply, and the output voltage of the power supply is 2-10 kV.
Preferably, the nano-catalyst is a nano-photocatalyst, the forbidden band width of the nano-photocatalyst is 1.5-3.2eV, and the absorption band of the nano-photocatalyst to light is 200-800 nm.
Preferably, the nano photocatalyst is a semiconductor catalyst with plasmon nanoparticles loaded on the surface.
Preferably, a plurality of catalytic discharge units are arranged in the shell, the catalytic discharge units are connected through the connecting piece, and the connecting piece is made of an insulating material.
The air disinfection and purification principle of the utility model is as follows:
compared with the conventional plasma and catalysis technology, the utility model discloses means such as air current distribution control, optimization catalyst and electrode combination mode are passed through to the device, make plasma, nanometer (light) catalyst and gaseous sufficient effect to realize the high-efficient coupling of surface interface chemical field of light, electric field and nanometer (light) catalyst of plasma. The utility model discloses a overcome catalysis method to the reliance of high temperature and the poor shortcoming of selectivity with the help of the light of plasma, electric field effect, utilize the special surface interface chemical field of nanometer (light) catalyst to solve the problem that plasma can only effectively get rid of single poisonous and harmful species simultaneously.
Firstly, different from the conventional plasma disinfection and purification technology, the utility model discloses well nanometer (light) catalyst coupling can show in the plasma and change the mode of discharging, makes plasma disperse in the discharge gap more evenly, and this will make plasma and the air of flowing through fully contact, ensures in the air that the air is interiorThe particles are fully charged, pathogenic microorganisms are effectively inactivated, and organic pollutants are efficiently activated. At the same time, the current pulse of the plasma is significantly weakened by the coupling of the nano (photo) catalyst, which weakens the nitrogen molecules (N) during the air discharge process2) Thereby suppressing the generation of nitrogen oxides and ozone (reaction formula 1-2).
Secondly, coupling the nano (photo) catalyst into the plasma in situ, on one hand, the nano (photo) catalyst with high catalytic activity can directly inactivate pathogenic microorganisms and remove organic pollutants under the action of plasma active species, and can also oxidize particles attached to the surface of the catalyst and promote the surface decomposition of ozone; on the other hand, the nano (photo) catalyst can generate electron/hole pairs (reaction formulas 3-4) under the self-luminous effect of the plasma, so that the photocatalytic reaction is effectively driven by generating a large number of active species (reaction formulas 5-6), and the disinfection and purification capacity of air is improved. The characteristics can not be realized by a pure plasma technology, and the problems of high temperature, high energy consumption and low selectivity faced by the conventional catalytic method are also overcome.
Semiconductor+hv(UV)→h++e- (3)
Nanoparticle+hv(Visible)→h++e- (4)
O2+h++2H+→2OH· (6)
Finally, in-situ coupling of the plasma and the nano (photo) catalyst can easily achieve high efficiency synergy of the two by modulating the specific discharge form and the nano (photo) catalyst (1+1> 2). This air disinfection purifier can carry out the high-efficient entrapment of particulate matter (containing pathogenic organism aerosol) to public indoor gas, carries out high-efficient deactivation and high-efficient oxidation desorption to virus and organic pollutant to can effectively avoid the formation of poisonous and harmful accessory substance, have the function that shows promotion indoor air quality concurrently.
Compared with the prior art, the air disinfection and purification device based on plasma in-situ coupling nano catalysis has the beneficial effects that:
1. compare in conventional air disinfection purifier based on plasma technique, the utility model provides a device will remove dust, desorption organic pollutant, disinfect the function integration such as disinfection integrative, avoid the system multistage, with the help of plasma and the high-efficient cooperation in light, electricity and the interface field that nanometer (light) catalyst normal position coupling formed, organic pollutant, pathogenic microorganism in the air can be realized, one step of poisonous accessory substance is got rid of.
2. The utility model discloses the low in cost of device, assembly are simple, both have been applicable to small-size air purification, also easily enlarge the application, and catalyst normal position equipment form in the device is nimble, and the modularization of the device of being convenient for, the device wholly has advantages such as energy utilization is high, the bactericidal effect is obvious, compact structure is simple, the complete machine is small.
3. The utility model ensures the full contact of the plasma, the catalyst and the air through the in-situ coupling of the nano (light) catalyst and the plasma, not only realizes the full utilization of the short-life active species generated by discharge on the surface of the catalyst, but also is beneficial to utilizing the self-luminous driving surface of the plasma for the photocatalytic reaction, thereby greatly improving the disinfection and purification capacity of the device to the air; and the active species of the plasma directly acts on the surface of the catalyst, so that the occupation of refractory organic matters and particles on the active sites on the surface of the catalyst is inhibited, the active sites of the surface catalysis are always kept in an open state, and the working stability of the whole device is enhanced while the stable discharge is ensured.
4. The utility model can adjust the surface property of the nano (light) catalyst, enhance the decomposition capability of the nano (light) catalyst to the by-product ozone and nitrogen oxide, and reduce the generation of toxic by-products; meanwhile, the active oxygen species generated by the ozonolysis can also promote the degradation of organic pollutants and the inactivation of pathogenic microorganisms.
5. The utility model discloses a catalyst is nanometer (light) catalyst, and it is steerable at 200 + 800nm to the absorption wave band of light, and this has guaranteed the high-efficient utilization of nanometer (light) catalyst to plasma self-luminescence (ultraviolet ray and visible light), is showing the air photocatalysis disinfection purification performance who has strengthened the device. The air disinfection and purification device couples the nano (photo) catalyst in the discharge area in situ, the discharge mode can be effectively changed due to the existence of the catalyst, and the coupling system can obtain higher energy efficiency under the same input power, so that more discharge active species are generated, and the charge of particles in the air, the degradation of organic matters and the inactivation efficiency of pathogenic microorganisms are improved.
Drawings
FIG. 1 is a schematic view of the overall structure of an air disinfecting and purifying device in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a typical coupling mode of a nano-catalyst in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a catalytic discharge unit according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a catalytic discharge unit in comparative example 1 of the present invention;
FIG. 5 is a schematic structural diagram of a catalytic discharge unit in comparative example 2 of the present invention;
fig. 6 is a schematic structural diagram of a catalytic discharge unit in comparative example 3 of the present invention.
In the figure, 1, a housing; 2. a first electrode assembly; 3. a second electrode assembly; 4. a connecting member; 5. a power source; 6. a wire; 7. a nano-catalyst; 8. a plasma region; 9. a photocatalyst net; 10. an ultraviolet lamp; 41. a PVC insulating sleeve; 42. a conductive metal screw.
Detailed Description
Example (b):
as shown in fig. 1-3, an air disinfection and purification device based on plasma in-situ coupling nano catalysis comprises a shell 1, a power supply 5, a connecting piece 4 and at least one catalytic discharge unit, wherein the connecting piece 4 and the catalytic discharge unit are arranged in the shell 1, the connecting piece 4 is connected with the shell 1, and the catalytic discharge unit is connected with the connecting piece 4 and is fixed in the shell 1 through the connecting piece 4. The catalytic discharge unit comprises a first electrode assembly 2 and a second electrode assembly 3 which are oppositely arranged, the first electrode assembly 2 and the second electrode assembly 3 are respectively connected with a power supply 5 through leads 6, the first electrode assembly 2 and the second electrode assembly 3 are used as positive and negative electrodes, and a plasma field is generated between the positive and negative electrodes, namely a plasma zone 8 is formed. A nano catalyst 7 is arranged between the first electrode assembly 2 and the second electrode assembly 3, the nano catalyst 7 is arranged in a plasma field, an air inlet and an air outlet for purifying gas are arranged on the shell 1, and the gas to be purified in the shell 1 flows through the plasma field and reacts with the nano catalyst 7 in the plasma field in a contact manner, so that the purposes of disinfection and purification are achieved.
The first electrode assembly 2 comprises a plate electrode or a needle electrode or a mesh electrode and the second electrode assembly 3 comprises a plate electrode or a needle electrode or a mesh electrode. Specifically, the first electrode assembly 2 and the second electrode assembly 3 may be a needle electrode array, an electrode plate, or an electrode mesh, wherein the needle pitch of the needle electrode array is millimeter, the needle length is millimeter, the pitch between the first electrode assembly 2 and the second electrode assembly 3 is millimeter, and the mesh number of the mesh electrode is 20-40 meshes. The electrode structure in the catalytic discharge unit in this embodiment is a pin-array-to-plate electrode, i.e., the first electrode assembly 2 is a pin-electrode array, and the second electrode assembly 3 is an electrode plate. The nano catalyst 7 is arranged on the surface of the plate electrode or the needle electrode or the mesh electrode and in the electrode gap, is filled between the positive electrode and the negative electrode or is coated on the surface of the plate electrode or the needle electrode or the mesh electrode, and can also be coupled between the discharge electrodes in a filling type combined coating mode to carry out circulation treatment on indoor air.
The power supply 5 is an alternating current, direct current or pulse power supply 5, and the output voltage of the power supply 5 is 2-10 kV. In this embodiment, a high-voltage positive direct current or negative direct current is used to supply power to the catalytic discharge unit, one of the first electrode assembly 2 and the second electrode assembly 3 is in a high-voltage state, the other one is grounded, and plasma is generated between the electrodes, i.e., a plasma region 8 is formed.
The nano-catalyst 7 is a nano-photocatalyst, the forbidden band width of the nano-photocatalyst is 1.5-3.2eV, and the absorption band of the nano-photocatalyst to light is 200-800 nm. This ensures the efficient utilization of the nano (photo) catalyst to the self-luminescence of the plasma (ultraviolet and visible light), and significantly enhances the air photocatalytic disinfection and purification capability of the device.
The nano photocatalyst is a semiconductor catalyst with plasmon nanoparticles loaded on the surface, the plasmon nanoparticles mainly refer to gold, silver and copper nanoparticles generating plasmon oscillation, and the semiconductor catalyst can be titanium oxide, zinc oxide and the like. The surface property of the nano (photo) catalyst arranged in the discharge area is modulated, so that the decomposition capability of the nano (photo) catalyst on by-product ozone and nitrogen oxide is enhanced, and the generation of toxic by-products is effectively reduced; meanwhile, active oxygen species generated by the efficient decomposition of ozone can promote the degradation of organic pollutants and the inactivation of pathogenic microorganisms.
A plurality of catalytic discharge units are arranged in the shell 1 and arranged in parallel to form a plurality of parallel discharge channels. The catalytic discharge units are connected through the connecting piece 4, the connecting piece 4 is made of insulating materials, and direct communication between the first electrode assembly 2 and the second electrode assembly 3 is prevented, so that a plasma field cannot be formed. It should be noted that the connecting member 4 only needs to ensure the insulation of the portion of the connecting member connected to the electrode, as shown in fig. 1, the connecting member 4 may be a conductive metal screw 42, and the portion of the connecting member connected to the first electrode assembly 2 is sleeved with a PVC insulating sleeve 41, which can also prevent the positive and negative electrodes from being directly connected.
Adopt the air purification device described in this embodiment, carry out sterilization and air purification test respectively, specific test process is as follows:
test example a: at 10m3Placing the air purification device shown in the figure 3 in a closed experiment chamber, carrying out white staphylococcus spray contamination in the experiment chamber by using a microbial aerosol generator, starting the air purification device after uniformly stirring, driving indoor air to enter a catalytic discharge reaction area by a fan to disinfect and purify the indoor air, sampling after circularly purifying for 60min, carrying out 3 times of repeated tests, and calculating to obtain the air purification device shown in the figure 3The 3-time killing rate of the staphylococcus albus in the treated sample is more than or equal to 99.90 percent, and the test requirement of a simulation field test in disinfection technical specification (2002 edition) 2.1.3 is met, so that the product is qualified for disinfection.
Test example b: at 30m3Placing the air purification device shown in the figure 3 in a closed laboratory, spraying phage microorganism aerosol into the laboratory cabin, continuously spraying for 15s at the speed of 0.3mL/min, then closing the aerosol generator, starting the air purification device to kill the indoor air phage, circularly purifying for 60min, then sampling, wherein the sampling flow is 2.7L/min, continuously sampling for 6min, performing 3 repeated tests, respectively performing titer determination after sampling, and determining 3 times of death rates of the phage in the sample treated by the air purification device shown in the figure 3, wherein the 3 times of death rates of the phage are not less than 98.9%, the requirements of field test in disinfection technical specification (2002 edition) 2.1.3 are met, and the disinfection is qualified.
Test example c: at 30m3Placing the air purification device shown in the figure 3 in a closed laboratory, filling the laboratory with toluene gas with a certain concentration to simulate polluted indoor air, starting the air purification device to purify the indoor air, circularly purifying for 60min, sampling, and performing 3 times of repeated tests, wherein the result shows that the initial concentration of toluene is 1.2mg/m3The concentration of toluene in the sample treated by the air purification device in the figure 3 is less than or equal to 0.06mg/m after 3 times3Meets the indoor toluene concentration standard of 0.2mg/m specified by the national standard GB/T1883-20023(1h mean).
Test example d: placing the air purifier in clean space, opening the device, testing ozone concentration at 1.5m away from ground according to standard requirement, measuring for 1h, and detecting to obtain ozone concentration of less than 0.03mg/m in the air purifier of FIG. 33Meets the requirements of safety and sanitation standard 6.2.9.2 ozone leakage quantity of CB28235-2011 ultraviolet air disinfector, and NO in the sample2The concentration of nitrogen dioxide is less than 0.02mg/m3Indoor NO in accordance with GB/T1883-20022Concentration standard value of 0.24mg/m3(1h mean).
Comparative example 1:
as shown in fig. 4, the air sterilizing and purifying device is different from the embodiment in that there is no catalyst coating between the electrodes of the catalytic discharge unit. The air purification device described in the comparative example was used to perform sterilization and air purification tests a-d, respectively, the specific test procedures were the same as in the examples, and the results were:
test example a: the 3-time killing rate of staphylococcus albus in the air treated by the sample purification device in the figure 4 is more than or equal to 90 percent.
Test example b: the 3-fold loss of phage was measured in the samples treated with the air purification apparatus of FIG. 4 to be about 94%.
Test example c: the toluene concentration in the sample treated with the air purification apparatus of FIG. 4 was about 0.74mg/m for 3 times3。
Test example d: FIG. 4 shows the concentration of ozone in air at 1.0mg/m when the air purification device is turned on3Nitrogen dioxide concentration 52mg/m3。
Comparative example 2:
as shown in fig. 5, the difference from the embodiment is that the catalyst coupling mode is different, specifically, a photocatalyst net 9 is disposed at the edge of the electrode, and a photocatalyst is attached on the photocatalyst net 9. The air purification device described in the comparative example was used to perform sterilization and air purification tests a to d, respectively, the specific test procedures were the same as those in the examples, and the results were:
test example a: the ratio of 3 times of killing of staphylococcus albus in the sample treated by the air purification device in fig. 5 is about 98%.
Test example b: the 3-fold loss of phage was measured in the samples treated with the air purification apparatus of FIG. 5 to be about 98%.
Test example c: the concentration of toluene in the sample treated by the air purification device in the figure 5 is less than or equal to 0.2mg/m for 3 times3。
Test example d: FIG. 5 shows the concentration of ozone in the air at 0.6mg/m when the air purification device is turned on3Nitrogen dioxide concentration 30mg/m3。
Comparative example 3:
as shown in fig. 6, the photocatalyst is also coupled between the discharge electrodes in a filling type combined coating manner in the air sterilizing and purifying device, which is different from the embodiment in that the ultraviolet lamp 10 is disposed above the catalytic discharge unit to replace the power source and electrodes for generating plasma in the embodiment. The air purification device described in the comparative example was used to perform sterilization and air purification tests a to d, respectively, the specific test procedures were the same as those in the examples, and the results were:
test example a: the ratio of 3-time killing of staphylococcus albus in the sample treated by the air purification device in fig. 6 was 90.99%.
Test example b: the 3-fold mortality of the phages measured in the samples treated with the air purification device of fig. 6 was about 97.44%.
Test example c: the concentration of toluene in the sample treated by the air purification device in the figure 6 is less than or equal to 0.58mg/m after 3 times3。
Test example d: figure 6 the by-product ozone generated by the air purification device is less than 0.1mg/m3The concentration of nitrogen dioxide is less than 0.02mg/m3。
The test results in the above examples and comparative examples are summarized in the following table:
TABLE 1 comparison of purifying effect of air purifying device in examples and comparative examples
It can be seen from the table that the utility model relates to an air disinfection purifier based on plasma normal position coupling nanometer catalysis no matter be bacteriophage effect of killing, toluene get rid of effect or accessory substance reduction effect and all show the best to be superior to simple discharge with simple photocatalysis effect, exist 1+1> 2's concerted catalysis effect promptly. In the indoor air purification process, the air purification device can effectively remove dust and sterilize air, and meets the requirement of healthy breathing of people. Compared with other multi-stage purification systems, the air purification device has the greatest advantages that the air purification device integrates dust removal, disinfection, sterilization and other functions, can inhibit byproducts from generating, and has the advantages of small volume, low cost, simple and convenient later maintenance and the like.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (8)
1. An air disinfection and purification device based on plasma in-situ coupling nano catalysis is characterized in that: including casing (1), power (5), connecting piece (4) and at least one catalysis discharge unit, connecting piece (4) and catalysis discharge unit are located in casing (1), connecting piece (4) with casing (1) is connected, catalysis discharge unit with connecting piece (4) are connected, catalysis discharge unit is including relative first electrode subassembly (2) and the second electrode subassembly (3) that set up, first electrode subassembly (2) and second electrode subassembly (3) all with power (5) link to each other for produce the plasma field between first electrode subassembly (2) and second electrode subassembly (3), be equipped with nanometer catalyst (7) between first electrode subassembly (2) and second electrode subassembly (3), nanometer catalyst (7) are located in the plasma field, be equipped with air inlet and gas outlet on casing (1), the gas flow in the shell (1) passes through the plasma field and contacts the nano-catalyst (7).
2. The air disinfection and purification device based on plasma in-situ coupling nano catalysis as claimed in claim 1, wherein: the first electrode assembly (2) comprises a plate electrode or a needle electrode or a mesh electrode and the second electrode assembly (3) comprises a plate electrode or a needle electrode or a mesh electrode.
3. The air disinfection and purification device based on plasma in-situ coupling nano catalysis as claimed in claim 2, wherein: first electrode subassembly (2) is needle electrode array, second electrode subassembly (3) are needle electrode array, electrode board or electrode net, the needle interval of needle electrode array is the millimeter level, and needle length is the millimeter level, interval between first electrode subassembly (2) and second electrode subassembly (3) is the millimeter level, the mesh number of net electrode is 20-40 mesh.
4. The air disinfection and purification device based on plasma in-situ coupling nano catalysis as claimed in claim 2, wherein: the nano-catalyst (7) is filled between the first electrode assembly (2) and the second electrode assembly (3) or coated on the surface of the first electrode assembly (2) and/or the second electrode assembly (3).
5. The air disinfection and purification device based on plasma in-situ coupling nano catalysis as claimed in claim 1, 2 or 3, wherein: the power supply (5) is an alternating current, direct current or pulse power supply, and the output voltage of the power supply (5) is 2-10 kV.
6. The air disinfection and purification device based on plasma in-situ coupling nano catalysis as claimed in any one of claims 1-4, wherein: the nano-catalyst (7) is a nano-photocatalyst, the forbidden band width of the nano-photocatalyst is 1.5-3.2eV, and the absorption wave band of the nano-photocatalyst to light is 200-800 nm.
7. The air disinfection and purification device based on plasma in-situ coupling nano catalysis as claimed in claim 6, wherein: the nano photocatalyst is a semiconductor catalyst with plasmon nanoparticles loaded on the surface.
8. The air disinfection and purification device based on plasma in-situ coupling nano catalysis as claimed in any one of claims 1-4 and 7, wherein: the catalytic discharge device is characterized in that a plurality of catalytic discharge units are arranged in the shell (1), the catalytic discharge units are connected through the connecting pieces (4), and the connecting pieces (4) are made of insulating materials.
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