CN1785484A - Microwave assisted plasma catalytic air purification method and purification device - Google Patents
Microwave assisted plasma catalytic air purification method and purification device Download PDFInfo
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- CN1785484A CN1785484A CN 200510100980 CN200510100980A CN1785484A CN 1785484 A CN1785484 A CN 1785484A CN 200510100980 CN200510100980 CN 200510100980 CN 200510100980 A CN200510100980 A CN 200510100980A CN 1785484 A CN1785484 A CN 1785484A
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Abstract
A microwave aided plasma catalyzing method an apparatus for cleaning air by degradating the harmful gas and eliminating the by-products (ozone and NOx) generated by plasma catalyzing features that the microwave field at 2.45-40 GH2 is applied to the plasma catalyzing reactor and a carbon reducing unit is additionally used.
Description
Technical field
The present invention relates to the application of a kind of plasma-catalytic technology on indoor air purification is handled, particularly microwave and plasma-catalytic are coupled, the airborne pernicious gas and eliminate the air purifying process of the accessory substance that produces in the plasma-catalytic process of degrading.
Background technology
The universal room air pollution that causes because of uses such as interior decoration and (central authorities) air-conditioners has been summed up as one of environmental factor that endangers publilc health by international community.For purifying the air of a room, developed indoor air-purification device miscellaneous and technology at present, comprise physical filtering, electrostatic precipitation, anion, ozone or ultraviolet etc., these purification techniques all can not thoroughly be eliminated gaseous contaminant, make it innoxious.In recent years, the new technology of labile organic compound such as plasma-catalytic and nano-photo catalytic has been applied to air purification field in succession.The technology that plasma-catalytic purifies air has had disclosure in Chinese patent CN94247975.0, CN02262150.4, CNO2205468.5, CN200320109667.2.But, in actual application, plasma-catalytic class purification techniques and device also exist a lot of deficiencies, embody a concentrated expression of: 1, can produce ozone and NO in the running
xDeng accessory substance, the output of these accessory substances sometimes even surpassed pernicious gas content before purifying, and, for indoor original NO
x, existing simple absorption class, photocatalysis class, plasma class air purifier all do not possess degradation capability; 2, the treating capacity in the unit interval is limited, the air velocity height of purifier, by the time in short-term, its degradation efficiency is low excessively, can't satisfy the requirement of handling mass flow air in the short time.
Show according to the relevant new data of looking into, up to now, the research work of microwave applications at plasma-catalytic degraded pernicious gas do not appeared in the newspapers both at home and abroad as yet.
Summary of the invention
At above-mentioned the deficiencies in the prior art, the invention provides the auxiliary plasma catalytic air purification method of a kind of microwave, use this method, the airborne pernicious gas of can effectively degrading can effectively be eliminated ozone, NO that the plasma-catalytic effect produces again
xAccessory substance.
Another object of the present invention just provides the auxiliary plasma catalytic air purification device of a kind of microwave, the airborne pernicious gas of can effectively degrading, and eliminate ozone, the NO that the plasma-catalytic effect produces
xAccessory substance can also be handled big air mass flow in the unit interval.
The purpose of method invention is achieved in that the plasma-catalytic indoor air purification technology that a kind of microwave is auxiliary, and its difference is, in the plasma-catalytic processing procedure, adds the microwave field of frequency 2.45～40GHz, and increases the carbon reduction unit.
For further realizing above-mentioned purpose, room air, carries out the pernicious gas seizure and concentrates then by adsorbent bed earlier through dedusting, sterilization processing.When the pernicious gas that captures reaches a certain amount of, concentrated desorb, be released in the space of relative closure, carry out plasma-catalytic and deoxidization, degradation and handle under the microwave field coupling, the organic matter in the pernicious gas is degraded, accessory substance ozone is consumed accessory substance NO simultaneously
xBe reduced to the nitrogen G﹠W.Through after the above-mentioned technical finesse, discharge be exactly satisfactory fresh air.
Simultaneously, the auxiliary plasma-catalytic indoor air-purification device of a kind of microwave provided by the invention is achieved in that and includes fillter section, the ultraviolet-sterilization section, be installed in the interior purification degraded section and the carbon reduction unit of housing of relative closure, purify the degraded section and include absorbing unit, microwave generating unit, plasma-catalytic reaction member, absorbing unit, plasma-catalytic reaction member lay respectively at the bottom and the top of degraded clean-up stage.
Air purifying process provided by the invention in the plasma-catalytic processing procedure, has added microwave field.Because under the microwave radiation condition, the productive rate and the energy of the free radical that is produced by the high energy electron of generation that high voltage excites and high energy electron bombardment are significantly improved, simultaneously, microwave can effectively improve the catalytic performance of catalyst such as nano titanium oxide, comprise photocatalysis and thermocatalytic, so can effectively improve the degradation rate of plasma catalytic reactor degradation of organic substances.
Because the present invention is in the plasma-catalytic processing procedure, increased the carbon reduction unit, under microwave action, utilize the mechanism of carbon reduction, can be from air, concentrating the resolved NO that goes out in back
xAnd the accessory substance NO that in the plasma-catalytic course of reaction, produces
xBe reduced to harmless nitrogen G﹠W.
Air cleaning unit provided by the invention, adopted the mode of in enclosure space, handling pernicious gas, the small amount of ozone that plasma-catalytic produces also can consume by the mode that participates in degradation of organic substances and oxidation CO in the space of relative closure automatically, by such process, NOx, CO, ozone are all finally eliminated.
Air cleaning unit provided by the invention, adopted the first intermittent cycle processing mode of afterwards degrading of adsorbing, adsorption process has guaranteed that pernicious gas effectively captures under upper air current speed condition, it is also processed that degradation treatment has subsequently guaranteed that then pernicious gas has the sufficient time to stop at treatment region, thereby both guaranteed good degradation effect, realized the air cleaning of big flow again pernicious gas.
Description of drawings
Accompanying drawing 1 is the functional-block diagram of air purification method among the present invention.
Accompanying drawing 2 is the structural representations of an embodiment of air cleaning unit among the present invention.
Accompanying drawing 3 is structural representations of parts 1 in the accompanying drawing 2.
Accompanying drawing 4 are air cleaning units have, under the no microwave situation to the effect comparison diagram of acetaldehyde degraded.
Accompanying drawing 5 are air cleaning units have, under no microwave-charcoal reduction unit situation, the output comparison diagram of accessory substance NOx.
The specific embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Accompanying drawing 1 is the block diagram of technical scheme among the present invention.After contaminated air entered this reactor, what give off promptly was to have purified the standard compliant air in back.
Among the air cleaning unit embodiment of the present invention, the air filtration section that bottom air import department is provided with is mainly done dust removal process to air, enzyme on the screen pack also can kill bacterium attached thereto simultaneously, and the virus less than 0.5 μ m that the ultraviolet germicidal at middle part can not be removed filter, spore etc. kill under the strong ultraviolet radiation effect.
The air filtration section has adopted elementary, middle and high tertiary filter 9 to be arranged in order mode, and wherein high efficiency particulate air filter has adopted the HEPA filter.
The ultraviolet-sterilization section is installed on a ultraviolet lamp tube 8, and certainly, the mode that also can take to install many ultraviolet lamp tubes realizes the sterilization purpose.
Among the air cleaning unit embodiment of the present invention, absorbing unit adopts the form of adsorbent bed 6, and adsorbing medium is the porous carbon absorbent, also can adopt the stronger adsorbing mediums of other absorption affinities such as polymeric adsorbant.Its main purpose is that pernicious gas is effectively captured.
Among the present invention, the effect of microwave is mainly reflected in several aspects: at first be the processing pernicious gas that strengthens plasma unit, the ability of degradation of organic substances; Next is to strengthen the carbon reduction ability, and the accessory substance NOx that produces in the plasma-catalytic course of reaction is reduced to the nitrogen G﹠W; Moreover, under microwave action, can parse the pernicious gas that absorbing unit is caught, make absorbing unit regeneration simultaneously.
So the microwave generating unit can be divided into separately independently three parts, act on carbon reduction unit, absorbing unit, plasma-catalytic reaction member respectively, also can adopt compound mode, concentrate to act on above-mentioned processing unit.In air cleaning unit embodiment provided by the invention, employing be compound mode, can realize above-mentioned purpose simultaneously.As shown in Figure 2, the microwave generating unit adopts conventional microwave generating apparatus 5, and microwave generating apparatus 5 directly is installed on air cleaning section closure casing 7 rear wall relative with air outlet slit, and the microwave that discharges will be concentrated and enter in the housing 7.
Among the present invention, the carbon reduction unit can be provided with separately, also can be provided with other processing unit combination.In air cleaning unit embodiment provided by the invention, adopted the mode that is provided with the combination of plasma-catalytic reaction member, be combined in the plasma catalytic reactor 1.
In air cleaning unit embodiment provided by the invention, the dielectric barrier filling bed type reactor 1 that the plasma-catalytic reaction member has selected for use high voltage to excite certainly, also can be selected other forms of plasma catalytic reactor for use.As shown in Figure 3, the reaction tube of dielectric barrier filling bed type reactor 1 includes two sections, leading portion is the plasma-catalytic reaction member in the pipe, be filled with the Woelm Alumina bead 12 of coated with nano titanium deoxide catalyst in the pipe, this conversion zone mainly is the plasma photocatalysis resolving harmful gas that passes through plasma exciatiaon under microwave reinforced effect, the material of filling in the pipe can be other also, as high dielectric materials such as barium titanates; Back segment is the carbon reduction unit of combination in the pipe, is filled with granular porous carbonaceous material 13 in the pipe, and its effect is under the auxiliary effect of microwave, and nitrogen oxide and the ozone of remnants is thoroughly purified elimination.Dielectric barrier filling bed type reactor 1 is excited by high voltage excitation apparatus 14, and inside is inner wire electrode 11, and the outside is specifically designed to the poroid external electrode of rectangular grid 10, perhaps is designed to the coiling electrode that can allow the microwave energy radiant energy to enter.
In air cleaning unit embodiment provided by the invention, adsorbent bed 6, plasma catalytic reactor 1 lay respectively at the bottom and the top of degraded clean-up stage, pernicious gas after the desorb is owing to absorbed the rising of heat temperature, also compile by free convection, be convenient to like this collect to purifying degraded section top.If the outlet of air cleaning unit, directly be arranged in the front upper place of degraded clean-up stage, pernicious gas leaks into the interior space easily, so in air cleaning unit embodiment provided by the invention, installed a closing door 2 at the air outlet slit place, as shown in Figure 2, when plasma reactor and microwave generating device works, will close, the top of whole like this housing is complete closed, and the then resolved again pernicious gas that goes out of adsorbent bed absorption will be in the enclosure space, and can not leak to indoor.Certainly, if the outlet of air cleaning unit directly is arranged in the front lower place of degraded clean-up stage, just near the middle part of air cleaning unit, just closing door can be removed, the poisonous gas leakage of sucking-off can be effectively prevented to separate in the processing procedure equally to indoor.
At air cleaning unit embodiment provided by the invention in use, through behind the adsorbent bed 6, pernicious gas wherein will be adsorbed through dust removal process, the air of disinfecting, and what discharge from outlet has been cleaned air passes.The 6 work regular hours of adsorbent bed, its adsorption effect will weaken, even forfeiture.So, microwave generating apparatus 5 will start, and pernicious gas is parsed from adsorbent bed 6, be released in the space of sealing to focus on, make adsorbent bed 6 regeneration simultaneously, can guarantee that like this air cleaning unit can constantly carry out adsorption treatment to airborne pernicious gas.Simultaneously, because after microwave generating apparatus 5 starts, closing door 2 will be closed, plasma catalytic reactor 1 also will start, the pernicious gas that parses and enter enclosure space will be under microwave action, fully contact with the oxidation panel (the Woelm Alumina bead 12 of coated with nano titanium deoxide catalyst) of plasma catalytic reactor 1, organic matter will be degraded, because the high dielectric material in plasma catalytic reactor 1 pipe can very effective absorption microwave energy, can effectively improve the catalytic performance (comprising photocatalysis and thermocatalytic) of bead surface nano-titanium dioxide, and the high energy electron of generation that high voltage excites and the productive rate and the energy of the free radical that the high energy electron bombardment is produced are obviously improved, improved organic degradation rate.And the accessory substance NO that in degradation process, produces
x, and room air in be adsorbed the resolved NO that goes out in back earlier
x,, under microwave action, will be reduced to the nitrogen G﹠W because of fully contacting with carbon reduction section (granular porous carbonaceous material 13).Adopt porous charcoal material 13 as the carbon reduction unit, in reduction process, can produce a spot of CO, stable within the specific limits by the control microwave power, can control CO amount that reduction section produces to lacking very.And owing to adopted step circular treatment mode, the minor by-products ozone that the oxidation panel of degradation process ionic medium precursor reactant device 1 produces in the space of relative closure, can consume automatically by the mode of degradation of organic substances and oxidation CO.By such process, NOx, CO, ozone are all finally eliminated.
Embodiment one
The air that contains acetaldehyde with processing is an example, and test selects for use the barium titanate bead as filled media, and the charcoal reduction unit is positioned at the catalytic reactor back segment.Microwave input power is 200W.Shown in Figure 4 be have, when no microwave radiation is strengthened, waste gas disposable when the catalytic reactor to the degradation effect of acetaldehyde relatively, as can be seen, the effect of microwave radiation post plasma degrade acetaldehyde has obvious enhancing, other organic matters such as benzene, organic degradation effect such as toluene is similar.
Embodiment two
Shown in Figure 5 be have, during no microwave-charcoal reduction unit, air disposable during by plasma catalytic reactor accessory substance NOx PR.Experimental condition is identical with embodiment one.As can be seen from Figure 5, behind adding microwave-charcoal reduction unit, NO
xAccessory substance reduces significantly.In addition, if microwave-charcoal reduction unit and catalytic reaction unit are separated circular treatment waste gas, NO
xOutput can further reduce, the circular treatment time is when longer, NO
xFinally can be eliminated fully.
In air cleaning unit embodiment provided by the invention, in housing 7, be installed on anion net 4, flow field, the temperature field of causing by microwave itself and microwave act on anion net 4, can produce a large amount of anions.When clarifier starts work next time, these anions will be released to indoor, reach the effect of nearly step improvement room air.Certainly, also can adopt the mode of installing the negative ion device that high voltage excites, reach the effect of making anion.
More than be the preferred forms of air cleaning unit of the present invention, according to content disclosed by the invention, some identical, replacement schemes that those of ordinary skill in the art can expect apparently all should fall into the protection domain of air cleaning unit of the present invention.
Claims (7)
1. the plasma-catalytic indoor air purification technology that microwave is auxiliary is characterized in that, in the plasma-catalytic processing procedure, adds the microwave field of 2.45 ° of 40GHz of frequency, and increases the carbon reduction unit.
2. the auxiliary plasma catalytic air purification device of a microwave, include fillter section, ultraviolet-sterilization section, contain the purification degraded section of plasma-catalytic reaction member, it is characterized in that, be installed in the interior purification degraded section of housing of relative closure, also comprise harmful gas adsorption unit, microwave generating unit, carbon reduction unit; Pernicious gas absorbing unit, plasma-catalytic reaction member lay respectively at the bottom and the top of degraded clean-up stage.
3. the plasma catalytic air purification device that microwave according to claim 2 is auxiliary, it is characterized in that, this air purifier is a rectangle structure, the bottom is air intake and air filtration section, the middle part is the ultraviolet-sterilization section, top is for purifying degraded section and clean air outlet, be installed on closing door (2) and fan (3) at the air outlet slit place, purify the absorbing unit in the degraded section, the microwave generating unit, the plasma-catalytic reaction member, the carbon reduction unit all is in the housing that is surrounded by sheet metal and net (7), absorbing unit is positioned at the bottom of degraded clean-up stage, and the plasma-catalytic reaction member is positioned at the top of this housing (7).
4. the plasma catalytic air purification device that microwave according to claim 3 is auxiliary, it is characterized in that, the plasma catalytic reactor (1) that contains the plasma-catalytic reaction member is selected dielectric barrier filling bed type reactor for use, the reaction tube of described reactor (1) includes two sections, leading portion is filled the barium titanate of coated with nano titanium deoxide catalyst or the particle (12) of other high dielectric materials in the pipe, back segment filler particles shape carbonaceous material (13) in the pipe; The external electrode of described reactor (1) adopts elongate strip grid hole shape electrode or coiling electrode (10).
5. the plasma catalytic air purification device that microwave according to claim 3 is auxiliary is characterized in that, absorbing unit adopts the form of adsorbent bed (6), and adsorbing medium is porous carbon absorbent or polymeric adsorbant.
6. the plasma catalytic air purification device that microwave according to claim 3 is auxiliary is characterized in that the air filtration section has adopted elementary, middle and high tertiary filter (9) to be arranged in order mode, and wherein high efficiency particulate air filter has adopted the HEPA filter.
7. the plasma catalytic air purification device that microwave according to claim 3 is auxiliary is characterized in that, is being installed on anion net (4) near microwave generating unit place.
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| CNB2005101009803A CN100427182C (en) | 2005-11-01 | 2005-11-01 | Microwave assisted plasma catalytic air purification method and purification device |
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| CNB2005101009803A CN100427182C (en) | 2005-11-01 | 2005-11-01 | Microwave assisted plasma catalytic air purification method and purification device |
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| CN103139951A (en) * | 2011-11-29 | 2013-06-05 | 日本斯频德制造株式会社 | Microwave processing device |
| CN103876678A (en) * | 2012-12-21 | 2014-06-25 | 陈晓波 | Plasma hand drier |
| CN110461082A (en) * | 2019-07-10 | 2019-11-15 | 江苏天楹环保能源成套设备有限公司 | A kind of apparatus and method reducing NOx content in air plasma pharos flame |
| CN111912046A (en) * | 2020-07-14 | 2020-11-10 | 张晓焦 | Air filtering device, equipment, preparation method and air filtering method |
| CN113209814A (en) * | 2020-01-21 | 2021-08-06 | 中国石油化工股份有限公司 | Microwave catalytic oxidation treatment method for VOCs-containing gas |
| CN113941239A (en) * | 2021-11-06 | 2022-01-18 | 云南华谱量子材料有限公司 | Method and device for efficiently purifying harmful tail gas by using microwave plasma |
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| CN101502757B (en) * | 2009-02-09 | 2011-05-11 | 大连海事大学 | Physical and chemical cooperated purification system and method for processing PFCs |
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| DE19903533A1 (en) * | 1999-01-29 | 2000-08-10 | Degussa | Process for the selective catalytic reduction of nitrogen oxides in oxygen-containing exhaust gases |
| CN2449810Y (en) * | 2000-09-13 | 2001-09-26 | 莱州市活性碳纤维厂 | Multifunctional plasma enhanced catalytic purifier |
| CN2847126Y (en) * | 2005-11-01 | 2006-12-13 | 深圳清华大学研究院 | Microwave auxiliary plasma catalytic air purifier |
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- 2005-11-01 CN CNB2005101009803A patent/CN100427182C/en not_active Expired - Fee Related
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| CN103139951A (en) * | 2011-11-29 | 2013-06-05 | 日本斯频德制造株式会社 | Microwave processing device |
| CN103139951B (en) * | 2011-11-29 | 2015-04-15 | 日本斯频德制造株式会社 | Microwave processing device |
| CN103876678A (en) * | 2012-12-21 | 2014-06-25 | 陈晓波 | Plasma hand drier |
| CN110461082A (en) * | 2019-07-10 | 2019-11-15 | 江苏天楹环保能源成套设备有限公司 | A kind of apparatus and method reducing NOx content in air plasma pharos flame |
| CN110461082B (en) * | 2019-07-10 | 2021-11-30 | 江苏天楹环保能源成套设备有限公司 | Device and method for reducing NOx content in flame of air plasma torch |
| CN113209814A (en) * | 2020-01-21 | 2021-08-06 | 中国石油化工股份有限公司 | Microwave catalytic oxidation treatment method for VOCs-containing gas |
| CN111912046A (en) * | 2020-07-14 | 2020-11-10 | 张晓焦 | Air filtering device, equipment, preparation method and air filtering method |
| CN114515489A (en) * | 2020-11-20 | 2022-05-20 | 陕西青朗万城环保科技有限公司 | Microwave ultraviolet plasma-based desulfurization and denitrification method and control system thereof |
| CN113941239A (en) * | 2021-11-06 | 2022-01-18 | 云南华谱量子材料有限公司 | Method and device for efficiently purifying harmful tail gas by using microwave plasma |
| CN113941239B (en) * | 2021-11-06 | 2023-10-10 | 云南华谱量子材料有限公司 | Method and device for efficiently purifying harmful tail gas by utilizing microwave plasma |
| CN114471148A (en) * | 2022-03-01 | 2022-05-13 | 浙江浩普环保工程有限公司 | Microwave heating dissociation denitration method for flue gas of thermal power plant |
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