CN108939850A - A kind of compartment low-temperature plasma generator - Google Patents
A kind of compartment low-temperature plasma generator Download PDFInfo
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- CN108939850A CN108939850A CN201810861731.3A CN201810861731A CN108939850A CN 108939850 A CN108939850 A CN 108939850A CN 201810861731 A CN201810861731 A CN 201810861731A CN 108939850 A CN108939850 A CN 108939850A
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- temperature plasma
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
- B01D53/323—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/305—Treatment of water, waste water, or sewage by irradiation with electrons
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
- H05H1/2443—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes the plasma fluid flowing through a dielectric tube
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Toxicology (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fluid Mechanics (AREA)
- Treating Waste Gases (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The present invention relates to a kind of compartment low-temperature plasma generators, including low-temperature plasma electrical source, discharge of plasma in low temperature unit and reaction of low temperature plasma device, two of them or more than two discharge of plasma in low temperature unit intercalation reaction devices, interval is laid in the medium flow direction, and the time for the non-discharge area between discharge cell that medium is laid by interval is 0.1s-50s.The present invention is by reducing the compound probability of active particle in low-temperature plasma generator, improving the efficiency of the pollutant in active particle degrading waste water and exhaust gas, reduce the generation probability of secondary pollution to waste water and the electric discharge of exhaust gas interval.
Description
Technical field
The present invention relates to a kind of low-temperature plasma generators for waste water and exhaust-gas treatment, specifically, being related to one kind
Compartment low-temperature plasma generator.
Background technique
Volatile organic matter (VOCs) is the important sources of atmosphere pollution.A large amount of VOCs are discharged into atmosphere, with NOx, SOx,
Complicated physical-chemical reaction occurs for O3 etc., leads to the generation of haze, brings serious harm to human health.Currently, VOCs is normal
The active carbon adsorption of the processing method of rule, absorption process, heat-accumulation combustion method, Production by Catalytic Combustion Process, catalytic oxidation, bioanalysis and light
Catalysis method etc., but many unfavorable factors such as generally existing purification is not thorough, operating cost height.And using plasma technology point
Solving all kinds of gaseous pollutant molecules is a kind of novel method for purifying waste gases, which, which has, opens the dirt for stopping, handling
Contaminate wide object range, anti-concentration and the advantages that flowed fluctuation ability is strong, purification efficiency is high.
In order to utilize these toxic and harmful gas of Low Temperature Plasma Treating, people are for low-temperature plasma in exhaust-gas treatment
The mechanism of action of body and the method for generating low temperature plasma have carried out a large amount of basic research.Energy in low temperature plasma
Transmitting is substantially are as follows: electronics obtains energy from electric field, converts energy to by colliding the interior energy and kinetic energy of molecule, obtains energy
Molecule be excited, at the same time, moieties are ionized, these particles activated mutually collide so as to cause a series of multiple
Miscellaneous physical-chemical reaction.Because a large amount of active particles for being rich in plasma for example ion, electronics, excitation state atom and molecule
And free radical etc., to provide condition by chemical reaction handling VOCs and odorant for plasma technique.But right
During VOCs and odorant are degraded, when active particle is not often reacted with VOCs and odorant by
The new active particle of newly generated high energy electron excitation is compound, so that the utilization rate of active particle is not high.
Furthermore O3 can be generated when the discharge medium of low temperature plasma is air or oxygen, and the service life of ozone is than other
Active particle will be grown, if be not fully utilized, have part O3 molecule by newly generated active particle it is compound fall, do not only result in
The utilization rate of active particle is not high, and can generate secondary pollution, such as nitrogen oxides.
Therefore the compound probability for reducing active particle in low-temperature plasma generator, also means that and improves active grain
The efficiency of son degradation VOCs and odorant, reduce secondary pollution and generate probability.
Although in view of the above-mentioned problems, patent CN204429064U, CN204380489U, CN201830541U,
CN103418217B, CN204485611U, CN203002160U are referred to plural serial stage electric discharge, but the technical side of these patents
Case is the sum of series total power input for simply increasing plasma generator, is inputted with the present invention in equal-wattage
Under the premise of interval lay plasma generator, be effectively reduced the compound probability of active component, improve the processing to waste water or exhaust gas
Effect has essential difference in mechanism and effect；Furthermore the time of every grade of electric discharge is longer in these patents, seeks to pass through extension
Discharge time improves treatment effect, has essence different from the discharge time for shortening every level-one in this patent.
Summary of the invention
The present invention is by reducing active particle in low-temperature plasma generator to waste water and the electric discharge of exhaust gas interval
Compound probability improves the efficiency of pollutant in active particle degrading waste water and exhaust gas, reduces the generation machine of secondary pollution
Rate.
The present invention provides a kind of compartment low-temperature plasma generator, including low-temperature plasma electrical source, low-temperature plasma
Body discharge cell and reaction of low temperature plasma device, two of them or the insertion of more than two discharge of plasma in low temperature units
Reaction of low temperature plasma device, interval is laid in the medium flow direction, will be divided into region of discharge between reaction of low temperature plasma device
Domain and non-discharge area.
Preferably, the time that medium passes through non-discharge area is 0.1s-50s.
Preferably, the spacing distance that the discharge of plasma in low temperature unit is laid in the medium flow direction being capable of basis
It needs to be adjusted.
Preferably, the low-temperature plasma electrical source is high voltage power supply, DC power supply, any one in the pulse power,
And the output power of power supply can be adjusted as needed.
Preferably, the electric discharge pattern of the discharge of plasma in low temperature unit be corona discharge, it is single dielectric barrier discharge, double
Dielectric barrier discharge, glow discharge, any one in radio frequency discharge.
Preferably, the low-temperature plasma generator is any one in grid type, spool formula or printed line formula.
Preferably, the low-temperature plasma generator region of discharge or non-discharge area filling catalytic ozonation agent,
Ozone-decomposing agent and active carbon etc..
Beneficial effects of the present invention:
The present invention is along multiple groups discharge cell is arranged on waste water and exhaust gas flow direction, by discharging waste water or exhaust gas interval,
The compound probability of active particle in low-temperature plasma generator can be reduced, active particle is improved and the degradation of pollutant is imitated
Rate.
Below by the variation to organic exhaust gas total hydrocarbon degradation effect, analysis inhibits low temperature plasma active component compound
Effect:
(1) it along multiple groups discharge cell is arranged on waste water and exhaust gas flow direction, can effectively enhance the disturbance of air-flow, promote
Into the mixing of medium, to increase collision and the reaction probabilities of living radical and contaminant molecule, living radical is improved
Utilization efficiency.Lab scale, pilot scale and industrial experiment statistics indicate that, open single discharge cell, and dispose one behind and do not open
The discharge cell opened, by two-stage type dielectric barrier discharge equipment compared with not disposing discharge cell thereafter, organic exhaust gas is total
The degradation efficiency of hydrocarbon improves 3%；
(2) energy injection of the generation of living radical dependent on discharge process, ordinary circumstance during dielectric barrier discharge
Under, with the raising of Implantation Energy, the yield of living radical is risen with it, but increase is gradually slack-off, and individually electric discharge is single
There are the upper limits for the generation density of first Implantation Energy and living radical.Therefore, it under certain power consumption, is discharged using multiple groups
Unit reasonably distributes energy injection, there is important influence for the yield of living radical.Lab scale and pilot experiment research
Show using single discharge cell, and a discharge cell that do not open is set behind, by putting for two-stage type dielectric impedance
For electric equipment compared with single discharge cell is only arranged, the former total hydrocarbon degradation efficiency is apparently higher than the latter；
(3) experiments have shown that, using two discharge cells, each discharge cell power is 180W, organic exhaust gas and low temperature etc. from
Daughter generator time of contact is respectively 0.1S, and the spacing of two low-temperature plasma generators is increased to 1.0m, total hydrocarbon by 0.3m
Degradation efficiency is 81%.In the case where total power consumption is certain, compared to single discharge cell, and increase electric discharge spacing, opens two
The total hydrocarbon degradation efficiency of group discharge cell improves 19%.The reason is that O the and O3 isoreactivity free radical that discharge process generates is close
It spends higher and lasts a long time (> 1s), generating through first discharge cell and discharging as the flowing of gas reaches second
It is difficult to completely consume when unit, still has a large amount of O and O3 isoreactivity free radical, their presence on second discharge cell periphery
It can inhibit the generation of second discharge cell O and O3, therefore, when two discharge cell arrangements are closer, generated total O and O3
The sum of generated when amount is individually arranged lower than two discharge cells, the adjustable design of spacing is used in the invention, effectively avoids this
One problem.
Detailed description of the invention
Fig. 1 is the schematic diagram of compartment low-temperature plasma generator of the present invention.
Label declaration:
1- reaction of low temperature plasma device；2- low-temperature plasma generator；3- low-temperature plasma electrical source；
4- terminal box；5- form；6- sewage draining exit；7- blow valve port.
Specific embodiment
Embodiment 1
The setup parameter of compartment low-temperature plasma generator is as follows: by 2 single dielectric impedances, spool formula low temperature plasma
Generator is spaced laying in the medium flow direction, total power input 360W, and the speed of media flow is 0.05m/s, medium with
Each plasma generator time of contact is 0.9s, and medium is 0.1s in the residence time of non-discharge area.
The organic volatile exhaust gas for taking certain sewage from oil refinery processing unit to generate is tested, and before experiment, benzene contains in exhaust gas
Amount is 80mg/Nm3, and after the degradation of above-mentioned compartment low-temperature plasma generator, the content of benzene is 24mg/Nm3, benzene removal
Rate is up to 70%.
Comparative example 1
The setup parameter of General low temperature plasma generator is as follows: 1 single dielectric impedance, spool formula low temperature plasma are sent out
Raw device is continuously laid in the medium flow direction, total power input 360W, and the speed of media flow is 0.05m/s, medium with etc.
Plasma generator time of contact is 1.8s, and medium is 0.1s in the non-discharge area residence time.
Organic exhaust gas same as Example 1 is taken to be tested, the removal rate of benzene is 49%.
Embodiment 2
The setup parameter of compartment low-temperature plasma generator is as follows: by 2 bi-medium to block, grid type low temperature plasma
Generator is spaced laying, total power input 360W, when medium and each plasma generator contact in the medium flow direction
Between be 0.1s, medium the non-discharge area residence time be 50s.
The organic exhaust gas Volatile Gas for taking certain sewage from oil refinery processing unit to generate is tested, before experiment, total hydrocarbon in exhaust gas
Content is 760mg/Nm3, after the degradation of above-mentioned compartment low-temperature plasma generator, total hydrocarbon content 152mg/Nm3, always
Hydrocarbon removal rate is up to 89%.
Comparative example 2
The setup parameter of General low temperature plasma generator is as follows: 1 bi-medium to block, grating type low temperature plasma are sent out
Raw device outer electrode is continuously laid in the medium flow direction, total power input 360W, and the speed of media flow is 0.1m/s,
Medium and plasma generator time of contact are 0.2s, and medium is 50s in the non-discharge area residence time.
Organic exhaust gas same as Example 2 is taken to be tested, total hydrocarbon removal rate is 67%.
Embodiment 3
The setup parameter of compartment low-temperature plasma generator is as follows: by 3 corona discharge arrays, spool formula low-temperature plasma
Body generator interval is laid, total power input 360W, and medium and each plasma generator time of contact are 0.1s, medium
It is 30s in the non-discharge area residence time.
The organic volatile gas exhaust gas for taking certain sewage from oil refinery processing unit to generate is tested, before experiment, mercaptan in exhaust gas,
The odour concentration content of the foul gas such as thioether is 10000, after the degradation of above-mentioned compartment low-temperature plasma generator, is disliked
The odour concentration content of odour is 1000, and removal rate is up to 90%.
Comparative example 3
The setup parameter of General low temperature plasma generator is as follows: 1 corona discharge array lines cartridge type low temperature plasma is sent out
Raw device outer electrode is laid in the medium flow direction, total power input 360W, medium and plasma generator time of contact
For 0.3s, medium is 30s in the non-discharge area residence time.
Organic exhaust gas same as Example 3 is taken to be tested, the odour concentration removal rate of the foul gas such as mercaptan, thioether
It is 56%.
Embodiment 4
The setup parameter of compartment low-temperature plasma generator is as follows: by 4 corona discharge arrays, spool formula low-temperature plasma
Body generator is spaced laying, pulse power total power input 360W in the medium flow direction, and the speed of media flow is
0.1m/s, medium and each plasma generator time of contact are 5s, and medium is 25s in the non-discharge area residence time.
The water outlet of certain sewage from oil refinery processing unit is taken to be tested, before experiment, the content of COD is 90mg/L in waste water,
After the degradation of above-mentioned compartment low-temperature plasma generator, the content of COD is 49.5mg/L, and removal rate is up to 55%.
Comparative example 4
The setup parameter of General low temperature plasma generator is as follows: by 1 corona discharge array, spool formula low temperature plasma
Generator is laid in the medium flow direction, total power input 360W, and the speed of media flow is 0.1m/s, medium and each
Plasma generator time of contact is 20s, is 25s in the non-discharge area residence time.
Waste water same as Example 4 is taken to be tested, COD removal rate is 40%.
Embodiment 5
The setup parameter of compartment low-temperature plasma generator is as follows: 5 glow discharge low-temp plasma generators are being situated between
It is spaced and lays on matter flow direction, total power input 360W, the speed of media flow is 10m/s, medium and each plasma
Generator time of contact is 0.01s, and medium is 5s in the non-discharge area residence time.
The organic volatile gas for taking certain sewage from oil refinery processing unit to generate is tested, before experiment, the content of benzene in exhaust gas
For 120mg/Nm3, after the degradation of above-mentioned compartment low-temperature plasma generator, the content of benzene is 80mg/Nm3, benzene removal
Rate is up to 33%.
Comparative example 5
The setup parameter of General low temperature plasma generator is as follows: by 1 glow discharge low-temp plasma generator in medium
It is continuously laid on flow direction, total power input 360W, the speed of media flow is 10m/s, medium and plasma generator
Time of contact is 0.05s, and medium is 5s in the non-discharge area residence time.
Organic volatile gas same as Example 5 is taken to be tested, benzene removal rate is 21%.
Embodiment 6
The setup parameter of compartment low-temperature plasma generator is as follows: by 2 dielectric barrier discharge low-temperature plasma generators
Interval 0.6m is laid in the medium flow direction, total power input 360W, and the speed of media flow is 1m/s, medium and each
Plasma generator time of contact is 0.05s, and medium is 0.6s in the non-discharge area residence time.
The organic volatile gas for taking certain sewage from oil refinery processing unit to generate is tested, before experiment, the content of benzene in exhaust gas
For 120mg/Nm3, after the degradation of above-mentioned compartment low-temperature plasma generator, the content of benzene is 74mg/Nm3, benzene removal
Rate is up to 38%.
Comparative example 6
The setup parameter of compartment low-temperature plasma generator is as follows: by 2 dielectric barrier discharge low-temperature plasma generators
Interval 0.3m is laid in the medium flow direction, total power input 360W, and the speed of media flow is 1m/s, medium and each
Plasma generator time of contact is 0.05s, and medium is 0.3s in the non-discharge area residence time.
Organic volatile gas same as Example 6 is taken to be tested, benzene removal rate is 35%.
Embodiment 7
The setup parameter of compartment low-temperature plasma generator is as follows: by 2 dielectric barrier discharge low-temperature plasma generators
Interval 0.6m is laid in the medium flow direction, and the ozone that 5cm thickness is filled between two low-temperature plasma generators decomposes
The speed of oxidant layer, total power input 360W, media flow is 1m/s, and medium is with each plasma generator time of contact
0.05s, medium are 2s in the non-discharge area residence time.
The organic volatile gas for taking certain sewage from oil refinery processing unit to generate is tested, before experiment, the content of benzene in exhaust gas
For 120mg/Nm3, after the degradation of above-mentioned compartment low-temperature plasma generator, the content of benzene is 46mg/Nm3, benzene removal
Rate is up to 61%.
Comparative example 7
The setup parameter of compartment low-temperature plasma generator is as follows: by 2 dielectric barrier discharge low-temperature plasma generators
Interval 0.6m is laid in the medium flow direction, total power input 360W, and the speed of media flow is 1m/s, medium and each
Plasma generator time of contact is 0.05s, and medium is 2s in the non-discharge area residence time.
Organic volatile gas same as Example 7 is taken to be tested, benzene removal rate is 38%.
The present invention passes through to waste water and the electric discharge of exhaust gas interval, drop it can be seen from above-described embodiment 1-6 and comparative example 1-6
The compound probability of active particle in low low-temperature plasma generator, hence it is evident that improve active particle degrading waste water and exhaust gas
In pollutant efficiency.
From embodiment 7 and comparative example 7 as can be seen that filling ozone-decomposing agent layer in compartment low-temperature plasma generator,
The compound probability of active particle in low-temperature plasma generator can be further decreased, hence it is evident that improve active particle degrading waste water and
The efficiency of pollutant in exhaust gas.
Claims (7)
1. a kind of compartment low-temperature plasma generator, including low-temperature plasma electrical source, discharge of plasma in low temperature unit and
Reaction of low temperature plasma device, which is characterized in that two or more discharge of plasma in low temperature unit insertion low temperature etc.
Plasma reactor, interval is laid in the medium flow direction, and region of discharge and non-will be divided between reaction of low temperature plasma device
Region of discharge.
2. a kind of compartment low-temperature plasma generator according to claim 1, which is characterized in that medium passes through absence of discharge
The time in region is 0.1s-50s.
3. a kind of compartment low-temperature plasma generator according to claim 1, which is characterized in that low temperature plasma is put
The spacing distance that electric unit is laid in the medium flow direction can be adjusted as needed.
4. a kind of compartment low-temperature plasma generator according to claim 1, which is characterized in that low temperature plasma electricity
Source is high voltage power supply, DC power supply, any one in the pulse power, and the output power of power supply can be adjusted as needed
Section.
5. a kind of compartment low-temperature plasma generator according to claim 1, which is characterized in that low temperature plasma is put
The discharge type of electric unit be corona discharge, single dielectric barrier discharge, double-dielectric barrier discharge, glow discharge, in radio frequency discharge
Any one.
6. a kind of compartment low-temperature plasma generator according to claim 1, which is characterized in that low temperature plasma hair
Raw device is any one in grid type, spool formula or printed line formula.
7. a kind of compartment low-temperature plasma generator according to claim 1, which is characterized in that in the region of discharge
And catalytic ozonation agent, ozone-decomposing agent or active carbon can be filled in non-discharge area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810861731.3A CN108939850A (en) | 2018-08-01 | 2018-08-01 | A kind of compartment low-temperature plasma generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810861731.3A CN108939850A (en) | 2018-08-01 | 2018-08-01 | A kind of compartment low-temperature plasma generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108939850A true CN108939850A (en) | 2018-12-07 |
Family
ID=64466517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810861731.3A Withdrawn CN108939850A (en) | 2018-08-01 | 2018-08-01 | A kind of compartment low-temperature plasma generator |
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| Country | Link |
|---|---|
| CN (1) | CN108939850A (en) |
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2018
- 2018-08-01 CN CN201810861731.3A patent/CN108939850A/en not_active Withdrawn
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Application publication date: 20181207 |