CN112316679B - Low-temperature plasma VOCs purification device and method - Google Patents
Low-temperature plasma VOCs purification device and method Download PDFInfo
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- CN112316679B CN112316679B CN202011127617.1A CN202011127617A CN112316679B CN 112316679 B CN112316679 B CN 112316679B CN 202011127617 A CN202011127617 A CN 202011127617A CN 112316679 B CN112316679 B CN 112316679B
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Abstract
The invention discloses a low-temperature plasma VOCs purification device and method, which comprises a plasma power supply and a main purification system, wherein the plasma power supply is arranged at the top of the main purification system; the main purification system comprises a main purification system shell, and a filtration chamber, a plasma chamber gas buffer chamber and a tail gas purification chamber which are communicated and arranged in the main purification system shell, wherein a nano catalyst is arranged in the plasma chamber, and the tail gas purification chamber is internally provided with activated carbon loaded with the nano catalyst and a chemical absorbent. According to the invention, the low-temperature plasma is adopted in cooperation with the nano catalysis technology, the variable frequency fan is utilized to regulate and control the residence time of gas in the equipment, VOCs are deeply degraded, and simultaneously the emission of tail gas such as ozone is avoided, so that the purification device has the advantages of high purification efficiency, convenience in installation and maintenance, no secondary pollution and the like.
Description
Technical Field
The invention relates to the technical field of air purification equipment, in particular to a low-temperature plasma VOCs purification device and method.
Background
With the acceleration of the industrialization process in China, the discharge amount of Volatile Organic Compounds (VOCs) generated in industrial production is increased rapidly, and the living environment and the human health are seriously affected. At present, the common VOCs treatment methods include an absorption/adsorption method, a condensation method, a combustion method and the like, and have the problems of high cost, poor universality, easy secondary pollution and the like. Plasma can be divided into equilibrium (electron temperature) and non-equilibrium (electron temperature) according to particle temperature>>Ion temperature) two types. The electron temperature of non-equilibrium plasma can reach ten thousand degrees, and the ion and neutral ion can be lowered to room temperature, i.e. the apparent temperature of the system is still very low, so the non-equilibrium plasma is called as 'low-temperature plasma', and is generally discharged from gasAnd (4) generating. The application of low-temperature plasma to waste gas treatment is a new technology developed in recent years, when the voltage applied to the inside and outside of a waste gas treatment channel reaches the discharge voltage of gas, the gas is broken down to generate high-energy electrons and OH, O, N and N2(A) The free radicals and other substances with extremely strong chemical reaction activity can destroy and decompose the molecular structure of the VOCs without selectivity, and the method has the advantages of simple equipment, low cost, strong universality, suitability for continuous treatment of low-concentration and high-air-volume VOCs and the like. However, the problems of immature technology, low safety, tail gas (such as ozone and nitrogen oxide) emission and the like still exist when low-temperature plasma is applied to treating VOCs at present. Aiming at the problem of tail gas generated by plasma, methods such as activated carbon adsorption, pyrolysis, catalytic decomposition and the like are mostly adopted at present, for example, the invention patent CN104084009A discloses a low-temperature plasma waste gas purification method, and the method of activated carbon adsorption is adopted to treat undegraded waste gas and tail gas generated by plasma through waste gas multi-stage treatment; the utility model CN210220074U discloses a combined plasma air purification device, which can prolong the life of activated carbon by embedding a heating body in the activated carbon lamination to heat at a proper time. However, the above method cannot completely solve the problem that the plasma generates tail gas such as ozone and nitrogen oxide with higher concentration, and the possibility of secondary pollution caused by tail gas escaping after adsorption saturation exists, and the cost is higher.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a low-temperature plasma VOCs purification device and method, which promote deep decomposition and oxidation of VOCs on the one hand, efficiently decompose byproducts such as ozone and nitrogen oxide generated by low-temperature plasma on the other hand, avoid secondary pollution, and have the advantages of modular assembly, convenience in installation and maintenance and lower cost.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a low-temperature plasma VOCs purification device comprises a plasma power supply and a main purification system, wherein the plasma power supply is arranged at the top of the main purification system;
the main purification system comprises a main purification system shell, and a filter chamber, a plasma chamber, a gas buffer chamber and a tail gas purification chamber which are communicated and arranged in the main purification system shell; the nano catalyst is arranged in the plasma chamber, the filter screen is arranged in the tail gas purification chamber, and the filter screen is provided with activated carbon loaded with the nano catalyst and the chemical absorbent.
The invention has the further improvement that one end of the shell of the main purification system is provided with an air inlet, and the other end is provided with an air outlet; the fan is an axial flow fan; the main purification system shell is provided with heat dissipation holes, and the bottom of the main purification system shell is provided with universal wheels.
The invention is further improved in that a first air inlet mesh grid, a second air inlet mesh grid, a third air inlet mesh grid, a fourth air inlet mesh grid and a fifth air inlet mesh grid are arranged between the air inlet and the air outlet, the filter chamber is arranged between the first air inlet mesh grid and the second air inlet mesh grid, the plasma chamber is arranged between the second air inlet mesh grid and the third air inlet mesh grid, the gas buffer chamber is arranged between the third air inlet mesh grid and the fourth air inlet mesh grid, and the tail gas purification chamber is arranged between the fourth air inlet mesh grid and the fifth air inlet mesh grid.
The invention has the further improvement that the first air inlet grid is arranged perpendicular to the airflow direction and communicated with the air inlet; a fan is arranged between the fifth air inlet grid and the air outlet grid;
the first air inlet mesh grid, the second air inlet mesh grid, the third air inlet mesh grid, the fourth air inlet mesh grid, the fifth air inlet mesh grid and the air outlet mesh grid are arranged in parallel, and each mesh grid is a hollow metal plate.
The invention is further improved in that a primary filter and a high-efficiency filter are arranged in the filter chamber; a honeycomb ceramic filter is arranged in the gas buffer chamber III, and the filter material of the honeycomb ceramic filter is honeycomb ceramic with the pore density of 10-20 ppi.
The invention has the further improvement that a plasma purifying channel is arranged in the plasma chamber; the plasma purification channel is parallel to the direction of air flow and consists of a plurality of layers of stainless steel tubes which are parallel to each other, a layer of quartz glass tube is arranged on the inner wall of each stainless steel tube, a stainless steel wire is arranged in the center of each stainless steel tube, two ends of each stainless steel wire are fixed through high-pressure fixed insulating rods, a foam ceramic tube loaded with a nano catalyst is arranged between each stainless steel wire and each quartz glass tube, the foam ceramic tube and the stainless steel wire are arranged at intervals, and the surface of the foam ceramic tube is loaded with the nano catalyst; the stainless steel wire and the stainless steel tube are respectively connected with the anode and the cathode of the plasma power supply.
The invention is further improved in that the foamed ceramic tube loaded with the nano catalyst is prepared by the following processes: adding nano MnOxOr CeO2Dispersing the powder in TiO2Dissolving the sol to obtain a mixture, soaking the foamed ceramic tube in the mixture, and calcining at 300-500 ℃ for 1-2 h, wherein the nano MnO in the mixturexOr CeO2The mass fraction of the powder is 5-10%.
The invention is further improved in that two layers of filter screens are arranged in the tail gas purification chamber IV, one layer of filter screen is provided with active carbon loaded with a nano catalyst, and the other layer of filter screen is provided with active carbon loaded with a chemical absorbent.
The further improvement of the invention is that the activated carbon loaded with the nano-catalyst is prepared by the following processes: adding nano MnOxAnd Co2O3Mixing to obtain mixed powder, and dispersing the mixed powder in SiO2Dissolving in sol to obtain mixture, soaking activated carbon in the mixture, and air drying, wherein the nano MnO in the mixed powderxThe mass fraction of the active carbon is 50 to 70 percent; SiO in ml2Adding 0.1g of mixed powder into the sol;
the activated carbon loaded with the chemical absorbent is prepared by the following processes: adding 5-10% Na into active carbon2S2O3Soaking in water solution and drying in the air;
wherein the activated carbon is 40-60 mesh columnar activated carbon.
A low-temperature plasma VOCs purification method, after entering the main purification system, VOCs mixed gas filters particulate matter through a filter chamber, then enters a low-temperature plasma chamber, under the high-pressure action of a plasma power supply, the produced low-temperature plasma and a nano catalyst act synergistically to decompose most VOCs, the produced ozone, nitrogen oxides and small molecular pollutants which are not thoroughly decomposed enter a gas buffer chamber, and are uniformly mixed in the buffer chamber, and part of small molecular pollutants are oxidized and decomposed by ozone; and the residual waste gas enters a tail gas purification chamber, residual ozone, nitric oxide and trace micromolecular pollutants are thoroughly decomposed and absorbed by the activated carbon loaded with the nano catalyst and the activated carbon loaded with the chemical absorbent in sequence, and are converted into oxygen, water and carbon dioxide, and finally clean air is discharged.
Compared with the prior art, the invention has the following beneficial effects: the method comprises the following steps that (1) VOCs mixed gas discharged by a factory enters a main purification system, particulate matters are filtered through a filter chamber, then the mixed gas enters a low-temperature plasma chamber, generated low-temperature plasma and a nano catalyst act synergistically under the high-voltage action of a plasma power supply to decompose most VOCs efficiently, simultaneously generated ozone, nitrogen oxides and small molecular pollutants which are not decomposed completely enter a gas buffer chamber, the generated ozone, the nitrogen oxides and the small molecular pollutants are further in full contact and are mixed uniformly in the buffer chamber, and part of the small molecular pollutants are oxidized and decomposed by ozone; and the residual uniformly mixed waste gas enters a tail gas purification chamber, residual ozone, nitrogen oxide and trace micromolecular pollutants are thoroughly decomposed and absorbed by the activated carbon loaded with the nano catalyst and the chemical absorbent in sequence, and are converted into oxygen, water and carbon dioxide, and finally clean air is left to be discharged from an air outlet or enter a next pipeline. In the whole purification process, the hierarchical integration and the efficient cooperation of multiple technologies of physical filtration, low-temperature plasma, nano catalysis and chemical absorption are fully realized, the technical content is high, and the scientificity is strong. The four treatment chambers of the main purification system adopt a modular design, so that the installation and the maintenance are convenient, and the cost is reduced;
furthermore, according to the concentration of pollutant, can adopt the frequency conversion fan to carry out the control of different gear wind speeds, adjust the dwell time of gas in the device, when guaranteeing high-efficient purification VOCs, reduce energy loss.
According to the invention, a method of low-temperature plasma and nano-catalysis is adopted, on one hand, a foamed ceramic tube is used as a catalyst carrier in a plasma channel, so that the retention time of waste gas in the plasma channel can be increased, the plasma discharge area is enlarged, the decomposition of VOCs is more efficient, and meanwhile, the generated ozone, nitrogen oxides and the like are synchronously decomposed by utilizing the synergistic effect of the catalyst, so that the concentration of tail gas is reduced; on the other hand, the ozone, the nitrogen oxide and the micromolecular pollutants are thoroughly decomposed by the interaction of the ozone and the micromolecular pollutants in the gas buffer chamber and the combined action of the nano catalysis and the chemical absorption in the tail gas purifying chamber, the purifying efficiency is high, and no secondary pollution is caused.
Drawings
FIG. 1 is an external structural view of the present invention;
FIG. 2 is a schematic view of the internal structure of the present invention;
FIG. 3 is a front view of the primary purification system of the present invention;
FIG. 4 is a cross-sectional view showing the internal structure of a single plasma-purifying channel according to the present invention;
wherein: 1-a control distribution room, 2-a main control panel, 3-an air inlet, 4-an air outlet, 5-a main purification system, 6-universal wheels, 7-a plasma power supply, 8-a VOCs detector, 9-a fan frequency converter, 10-a control distribution room shell, 11-a main purification system shell, 12-a first air inlet grid, 13-a primary filter, 14-a high-efficiency filter, 15-a second air inlet grid, 16-a plasma purification channel, 17-a high-voltage connecting port, 18-a high-voltage fixed insulating rod, 19-a third air inlet grid, 20-a honeycomb ceramic filter, 21-a fourth air inlet grid, 22-a nano catalyst loaded active carbon filter and 23-a chemical absorbent loaded active carbon filter, 24-a fifth air inlet grid, 25-heat dissipation holes, 26-an air outlet grid, 27-a fan, 28-a stainless steel pipe, 29-a quartz glass pipe, 30-a catalyst-loaded foam ceramic sleeve, 31-a stainless steel wire, an I-filter chamber, an II-plasma chamber, an III-gas buffer chamber and an IV-tail gas purification chamber.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1-4, the low-temperature plasma VOCs purification apparatus of the present invention comprises a control distribution chamber 1 and a main purification system 5, wherein the control distribution chamber 1 is arranged on top of the main purification system 5; the control power distribution room 1 comprises a control power distribution room shell 10, a main control panel 2, a plasma power supply 7, a VOCs detector 8 and a fan frequency converter 9; wherein, be provided with plasma power 7, VOCs detector 8 and fan converter 9 in the control switch board shell 10, be provided with main control panel 2 on the control switch board shell 10 outer wall. The main purification system 5 comprises a main purification system shell 11, an air inlet 3, four treatment chambers, a fan 27 and an air outlet 4; wherein, one end of the main purification system shell 11 is provided with an air inlet 3, the other end is provided with an air outlet 4, the air outlet 4 is provided with a fan 27, the air inlet 3 is connected with a waste gas inlet pipe, and the air outlet 4 is connected with an air outlet pipeline; four treatment chambers are arranged in the main purification system shell 11, and are respectively a filter chamber I, a plasma chamber II, a gas buffer chamber III and a tail gas purification chamber IV along the direction from the gas inlet 3 to the gas outlet 4; the control distribution room shell 10 and the main purification system shell 11 are both stainless steel frames, and universal wheels 6 are arranged at the bottom of the main purification system shell 11 to facilitate the movement of equipment.
Each processing chamber is separated by a gas grid and is independent; specifically, the air inlet 3 is communicated with a first air inlet grid 12, the filter chamber I is arranged between the first air inlet grid 12 and a second air inlet grid 15, the plasma chamber II is arranged between the second air inlet grid 15 and a third air inlet grid 19, the gas buffer chamber III is arranged between the third air inlet grid 19 and a fourth air inlet grid 21, and the tail gas purification chamber IV is arranged between the fourth air inlet grid 21 and a fifth air inlet grid 24.
The first air inlet grid 12 is communicated with the air inlet 3 in a direction perpendicular to the air flow direction; a fan 27 is arranged between the fifth air inlet grid 24 and the air outlet 4 grid 26, and the purified air is discharged from the air outlet 4 or enters the next pipeline through the air outlet grid 26.
The first air inlet mesh grid 12, the second air inlet mesh grid 15, the third air inlet mesh grid 19, the fourth air inlet mesh grid 21, the fifth air inlet mesh grid 24 and the air mesh grid 26 are arranged in parallel, and each mesh grid is a hollow metal plate.
And a primary filter 13 and a high-efficiency filter 14 are arranged in the filter chamber I.
A high-voltage fixed insulating rod 18, a high-voltage connecting port 17 and a plasma purifying channel 16 are arranged in the plasma chamber II; the plasma purge channel 16 is parallel to the gas flow direction. The plasma purification channel 16 is composed of a plurality of layers of stainless steel tubes 28 which are parallel to each other, the inner wall of each stainless steel tube is tightly attached to a layer of quartz glass tube 29, two ends of a stainless steel wire 31 are arranged at the center of the stainless steel tube 28 through high-pressure fixed insulating rods 18, a foam ceramic tube 30 loaded with a nano catalyst is arranged between the stainless steel wire 31 and the quartz glass tube 29, the foam ceramic tube 30 is not in contact with the stainless steel wire 31, namely the foam ceramic tube 30 and the stainless steel wire 31 are arranged at intervals; the stainless steel wire 31 and the stainless steel pipe 28 respectively pass through the high-voltage connecting port 17 to be connected with the positive electrode and the negative electrode of the plasma power supply 7.
The foamed ceramic tube 30 loaded with the nano catalyst is manufactured by the following process: adding nano MnOxOr CeO2Dispersing the powder in TiO2Dissolving the sol to obtain a mixture, soaking the foamed ceramic tube in the mixture, and calcining at 300-500 ℃ for 1-2 h, wherein the nano MnO in the mixturexOr CeO2The mass fraction of the powder is 5-10%.
A cuboid honeycomb ceramic filter 20 is arranged in the gas buffer chamber III, the honeycomb ceramic filter 20 is made of honeycomb ceramic, and the pore density of the honeycomb ceramic is 10-20 ppi.
Specifically, two layers of filter screens are arranged in the tail gas purification chamber IV, one layer of filter screen is provided with active carbon loaded with a nano catalyst, and the other layer of filter screen is provided with active carbon loaded with a chemical absorbent.
The active carbon loaded with the nano catalyst is prepared by the following processes: adding nano MnOxAnd Co2O3Mixing to obtain mixed powder, and dispersing the mixed powder in SiO2Dissolving in sol to obtain mixture, soaking activated carbon in the mixture, and air drying, wherein the nano MnO in the mixed powderxThe mass fraction of the active carbon is 50 to 70 percent; SiO in ml2Adding 0.1g of mixed powder into the sol;
the activated carbon loaded with the chemical absorbent is prepared by the following processes: mixing the activated carbon in massNa with concentration of 5-10%2S2O3Soaking in water solution and drying in the air;
wherein the activated carbon is 40-60 mesh columnar activated carbon.
Wherein the activated carbon is 40-60 mesh columnar activated carbon, and the frame of the filter screen is an aluminum alloy member. The fan 27 is arranged at the rear end of the fifth air inlet grid 24, and the fan 27 is an axial flow fan; the wind speed controlled by the fan frequency converter 9 is three gears, and the corresponding wind speed ranges are respectively as follows: 0.1 to 4.0m/s, 4.0 to 8.0m/s and 8.0 to 12.0 m/s. The main purification system shell 11 corresponding to the bottom and the side wall of the fan 27 is provided with a heat dissipation hole 25, so that the fan is prevented from being overheated.
The process of the low-temperature plasma VOCs purification method of the invention is as follows:
and (3) opening the main control panel 2, selecting a proper fan gear according to the concentration of VOCs collected by the detector 8 at the air inlet 3, and starting the plasma power supply 7. Under the driving of the fan 27, the VOCs discharged from the factory enter the filter chamber i of the main purification system 5 through the air inlet 3 via the first air inlet grid 12, and particulate matters in the air are filtered by the primary filter 13 and the high-efficiency filter 14 respectively; the pretreated VOCs enter a plasma chamber II, and under the action of high pressure, low-temperature plasma and MnO loaded on the foamed ceramic are generatedx/TiO2Or CeO2/TiO2The nanometer catalyst has synergistic effect, so that most VOCs are efficiently decomposed, and ozone, nitrogen oxides and the like generated by decomposition are simultaneously decomposed; the incompletely degraded mixed gas enters a next-stage gas buffer chamber III; the mixed waste gas is further contacted and uniformly mixed in a 10-30 cm honeycomb ceramic filter 20 pipeline in a buffer chamber III, and part of small molecular pollutants are oxidized and decomposed by ozone; the uniformly mixed waste gas enters a tail gas purification chamber IV, residual ozone, nitrogen oxides and trace micromolecular pollutants are thoroughly decomposed and absorbed by a nano catalyst in the nano catalyst loaded activated carbon filter 22 and an activated carbon filter 23 loaded by a chemical absorbent in sequence, and finally clean air is left to be discharged from an air outlet 4 or enter the next pipeline. The concentration of VOCs at the outlet 4 is continuously detected by the detector 8 and displayed on the main control panel 2. The invention adopts a modular design and gradesThe filtration, the low-temperature plasma, the nano catalysis and the chemical absorption are combined efficiently, so that the installation and the maintenance are convenient; to the factory waste gas of different concentrations, adopt the frequency conversion fan to carry out the control of different gear wind speeds, adjust the dwell time of gas in equipment, the VOCs purifies more high-efficient, no secondary pollution, and energy loss is low.
Claims (7)
1. A low-temperature plasma VOCs purification device is characterized by comprising a plasma power supply (7) and a main purification system (5), wherein the plasma power supply (7) is arranged at the top of the main purification system (5);
the main purification system (5) comprises a main purification system shell (11), and a filter chamber (I), a plasma chamber (II), a gas buffer chamber (III) and a tail gas purification chamber (IV) which are communicated and arranged in the main purification system shell (11); a nano catalyst is arranged in the plasma chamber (II), a filter screen is arranged in the tail gas purification chamber (IV), and activated carbon loaded with the nano catalyst and a chemical absorbent is arranged on the filter screen;
one end of the main purification system shell (11) is provided with an air inlet (3), and the other end is provided with an air outlet (4); the fan (27) is an axial flow fan; the main purification system shell (11) is provided with heat dissipation holes (25), and the bottom of the main purification system shell (11) is provided with universal wheels (6);
a first air inlet mesh grid (12), a second air inlet mesh grid (15), a third air inlet mesh grid (19), a fourth air inlet mesh grid (21) and a fifth air inlet mesh grid (24) are arranged between the air inlet (3) and the air outlet (4), the filter chamber (I) is arranged between the first air inlet mesh grid (12) and the second air inlet mesh grid (15), the plasma chamber (II) is arranged between the second air inlet mesh grid (15) and the third air inlet mesh grid (19), the gas buffer chamber (III) is arranged between the third air inlet mesh grid (19) and the fourth air inlet mesh grid (21), and the tail gas purification chamber (IV) is arranged between the fourth air inlet mesh grid (21) and the fifth air inlet mesh grid (24);
the foamed ceramic tube (30) loaded with the nano-catalyst is prepared by the following processes: adding nano MnOxOr CeO2Dispersing the powder in TiO2Dissolving the sol to obtain a mixture, soaking the foamed ceramic tube in the mixture, and calcining at 300-500 ℃ for 1-2 h;
a plasma purifying channel (16) is arranged in the plasma chamber (II); the plasma purification channel (16) is parallel to the direction of air flow, the plasma purification channel (16) is composed of a plurality of layers of stainless steel tubes (28) which are parallel to each other, a layer of quartz glass tube (29) is arranged on the inner wall of each stainless steel tube, a stainless steel wire (31) is arranged in the center of each stainless steel tube (28), two ends of each stainless steel wire (31) are fixed through high-pressure fixing insulating rods (18), a foam ceramic tube (30) loaded with a nano catalyst is arranged between each stainless steel wire (31) and each quartz glass tube (29), the foam ceramic tubes (30) and the stainless steel wires (31) are arranged at intervals, and the surface of each foam ceramic tube (30) is loaded with the nano catalyst; the stainless steel wire (31) and the stainless steel tube (28) are respectively connected with the anode and the cathode of the plasma power supply (7).
2. A low temperature plasma VOCs purification apparatus as claimed in claim 1, wherein the first grid (12) is disposed perpendicular to the direction of gas flow, and the first grid (12) is in communication with the gas inlet (3); a fan (27) is arranged between the fifth air inlet grid (24) and the air outlet grid (26);
the first air inlet mesh grid (12), the second air inlet mesh grid (15), the third air inlet mesh grid (19), the fourth air inlet mesh grid (21), the fifth air inlet mesh grid (24) and the air outlet mesh grid (26) are arranged in parallel, and each mesh grid is a hollow metal plate.
3. A low temperature plasma VOCs purification apparatus as claimed in claim 1, wherein a primary filter (13) and a high efficiency filter (14) are disposed in the filter chamber (i); a honeycomb ceramic filter (20) is arranged in the gas buffer chamber III, and the filter material of the honeycomb ceramic filter (20) is honeycomb ceramic with the pore density of 10-20 ppi.
4. According to the claimsClaim 1 the purification device for VOCs (volatile organic compounds) with low-temperature plasmas is characterized in that nano MnO is contained in the mixturexOr CeO2The mass fraction of the powder is 5-10%.
5. The device for purifying VOCs of claim 1, wherein two layers of filter screens are arranged in the tail gas purification chamber IV, one layer of filter screen is provided with activated carbon loaded with nano-catalyst, and the other layer of filter screen is provided with activated carbon loaded with chemical absorbent.
6. The apparatus of claim 5, wherein the activated carbon loaded with nano-catalyst is prepared by the following steps: adding nano MnOxAnd Co2O3Mixing to obtain mixed powder, and dispersing the mixed powder in SiO2Dissolving in sol to obtain mixture, soaking activated carbon in the mixture, and air drying, wherein the nano MnO in the mixed powderxThe mass fraction of the compound is 50% -70%; SiO in ml2Adding 0.1g of mixed powder into the sol;
the activated carbon loaded with the chemical absorbent is prepared by the following processes: adding 5-10% of Na to the activated carbon2S2O3Soaking in water solution and drying in the air;
wherein the activated carbon is 40-60 mesh columnar activated carbon.
7. A low-temperature plasma VOCs purification method based on the device of any one of claims 1-6 is characterized in that after entering a main purification system, VOCs mixed gas is filtered through a filter chamber to remove particles, then enters a low-temperature plasma chamber, and under the high-pressure action of a plasma power supply, the generated low-temperature plasma and a nano catalyst cooperate to decompose most VOCs, and the generated ozone, nitrogen oxides and small molecular pollutants which are not completely decomposed enter a gas buffer chamber and are uniformly mixed in the buffer chamber, and part of small molecular pollutants are oxidized and decomposed by ozone; and the residual waste gas enters a tail gas purification chamber, residual ozone, nitric oxide and trace micromolecular pollutants are thoroughly decomposed and absorbed by the activated carbon loaded with the nano catalyst and the activated carbon loaded with the chemical absorbent in sequence, and are converted into oxygen, water and carbon dioxide, and finally clean air is discharged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011127617.1A CN112316679B (en) | 2020-10-20 | 2020-10-20 | Low-temperature plasma VOCs purification device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011127617.1A CN112316679B (en) | 2020-10-20 | 2020-10-20 | Low-temperature plasma VOCs purification device and method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11169645A (en) * | 1997-12-11 | 1999-06-29 | Sekisui Chem Co Ltd | Gas decomposing method |
| WO2017171151A1 (en) * | 2016-03-31 | 2017-10-05 | 주식회사 애리프 | Ductless air purification apparatus for purifying and treating volatile organic compounds and fine dusts |
| KR20190080039A (en) * | 2017-12-28 | 2019-07-08 | 한국화학연구원 | Apparatus for decomposition of volatile organic compounds and decomposing method using it |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100434940B1 (en) * | 2000-12-12 | 2004-06-10 | 한국기계연구원 | Catalyst Reactor Activated for Treating Hazardous Gas with Nonthermal Plasma and Dielectric Heating and Method Treating thereof |
| KR20060026424A (en) * | 2003-06-17 | 2006-03-23 | 닛테쯔 고우교 가부시키가이샤 | Gas processing method and gas processing apparatus utilizing oxidation catalyst and low-temperature plasma |
| CN101298024B (en) * | 2008-01-11 | 2011-03-23 | 深圳市格瑞卫康环保科技有限公司 | Catalyst for purifying volatile organic pollutant and ozone in air under normal temperature as well as preparation and use thereof |
| CN101797476A (en) * | 2010-03-12 | 2010-08-11 | 东莞市环顺环保器材有限公司 | Waste gas treatment device and method based on functions of low-temperature plasma and activated carbon |
| CN103381363B (en) * | 2013-07-29 | 2016-02-10 | 上海交通大学 | Catalysts and its preparation method, the purposes of deozonize and harmful organic substance simultaneously |
| CN103721510A (en) * | 2013-12-13 | 2014-04-16 | 江苏中科睿赛污染控制工程有限公司 | VOCs high-efficiency processing method |
| CN105498752A (en) * | 2014-09-23 | 2016-04-20 | 中国石油大学(华东) | Preparation method for manganese oxide/porous carbon catalyst used for plasma air purification |
| CN105597529B (en) * | 2015-12-24 | 2018-07-24 | 浙江大学 | A kind of technique and device of low-temperature plasma synergistic two-stage catalytic degradation industrial organic exhaust gas |
| CN105864904A (en) * | 2016-04-07 | 2016-08-17 | 西安交通大学 | Indoor air purifying device based on low-temperature plasma |
| CN105921007A (en) * | 2016-05-06 | 2016-09-07 | 张家港市艾尔环保设备有限公司 | Organic waste gas purifying device and method |
| CN106902624A (en) * | 2017-02-14 | 2017-06-30 | 徐亚军 | The technology of new raising VOCs treatment efficiency |
| CN107321148A (en) * | 2017-07-14 | 2017-11-07 | 四川大学 | A kind of VOCs for removing low concentration big flow method and its modified catalyst |
| CN108543418B (en) * | 2018-04-25 | 2020-09-08 | 上海化工研究院有限公司 | Slot type waste gas purifying device capable of being combined in multiple stages |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11169645A (en) * | 1997-12-11 | 1999-06-29 | Sekisui Chem Co Ltd | Gas decomposing method |
| WO2017171151A1 (en) * | 2016-03-31 | 2017-10-05 | 주식회사 애리프 | Ductless air purification apparatus for purifying and treating volatile organic compounds and fine dusts |
| KR20190080039A (en) * | 2017-12-28 | 2019-07-08 | 한국화학연구원 | Apparatus for decomposition of volatile organic compounds and decomposing method using it |
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