CN106902620A - Corona-dielectric barrier discharge low-temperature plasma purification waste gas method and device - Google Patents
Corona-dielectric barrier discharge low-temperature plasma purification waste gas method and device Download PDFInfo
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
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Abstract
Corona-dielectric barrier discharge low-temperature plasma purification waste gas method and device, belongs to waste gas purification technical field.The device includes reaction of low temperature plasma device, air distribution system and Tail gas measuring and retracting device, and, using corona and dielectric impedance collaboration electric discharge, its high energy particle yield is big, and initial breakdown potential is forced down for reaction of low temperature plasma device.The detection of the present invention reacted device gas circuit, the setting of reactor condition of work, the clearing up of organic exhaust gas, stripping and vent gas treatment Four processes realize that organic waste-gas purification is processed, and have the advantages that apparatus structure is simple, easy to operate, energy consumption is low, treatment effeciency is high.The present invention can be cheap and easy to get with air as source of the gas, method environmental protection, effectively improves the purified treatment effect of waste gas.
Description
Technical field
The invention belongs to waste gas purification technical field, and in particular to a kind of corona-dielectric barrier discharge low-temperature plasma purification waste gas method and device.
Background technology
Organic pollution（VOCS）The compounds such as middle non-methane hydro carbons, acids, alcohols easily with OH, O in air3Reaction, sucks human body, the symptom such as triggers dizzy, nausea, faints, and long-term suction even results in life danger, not only causes air environmental pollution, goes back entail dangers to health.Existing VOCSTreatment process, such as absorption method, absorption process, condensation method, biological treatment, membrane separation process, mainly by organic pollution from a space transfer to another space, or become liquid phase, solid phase by gas phase, and pollutant is not degraded thoroughly, easily causes secondary pollution.It is a kind of waste gas purification technology emerging in recent years during corona discharge and dielectric barrier discharge acted synergistically on into waste gas purification that corona-dielectric barrier discharge low-temperature plasma technology is, the main high voltage U applied by electrode two ends（U≤UPuncture）, formed high electric field, breakdown electrode nearby air molecule, produce high-energy active particle, with VOCS, there is redox reaction, so as to realize VOC in collisionSDegradation treatment.
The method and device of existing plasma purification waste gas, the publication No. that such as on April 22nd, 2015 announces processes the method and apparatus of industrial waste gas for a kind of use non-thermal plasma trap of CN104524932A.The invention utilizes medium discharge, and preprocessed device, low temp plasma purifier, spray column tertiary treatment realize the purification of industrial waste gas.The major defect of the invention is：（1）The invention uses single medium discharge mode, causes high energy active material to produce few, and exhaust-gas treatment time lengthening influences waste gas purification effect；（2）The invention designs the 2-6 configuration of reative cell connection in series-parallel combination, though high energy active particle quantity can be increased, equipment box volume and its production cost is increased simultaneously, and when low concentration gas are processed, easily causes the idle of reative cell；（3）The invention is Titanium from electrode, increases equipment cost, is unfavorable for extensive life.
The content of the invention
The present invention seeks to：It is not enough for existing waste gas purification apparatus, propose that a kind of corona-dielectric barrier discharge low-temperature plasma purifies the method and device of waste gas, have the advantages that apparatus structure is simple, easy to operate, energy consumption is low, treatment effeciency is high.
The present invention use principle be：Using corona-dielectric barrier discharge low-temperature plasma technology, under the synergy of corona-dielectric barrier discharge, air through plasma reaction device high voltage field discharge breakdown, produce the active particle with interior energy high and kinetic energy, these high energy particles directly clash into, oxidation occur with exhaust emission molecule, by exhaustive oxidation into H2O and CO2, realize the purpose of removal pollutant.The method it is same as the prior art be that air is punctured using high voltage field, electric discharge produces high energy active particle, cooperates with electric discharge to replace single discharge mode with dielectric impedance by corona, improves high energy particle yield and its energy, process time is reduced, treatment effect is improved.
Realizing the technical scheme of goal of the invention is：A kind of corona-dielectric barrier discharge low-temperature plasma purification exhaust device, including reaction of low temperature plasma device, air distribution system and Tail gas measuring and retracting device are constituted.The reaction of low temperature plasma device is provided with high-voltage ac power, corona-dielectric barrier discharge pipe and fixed mount；The corona-dielectric barrier discharge pipe includes the band adjustable positive pole stainless steel bar of needle point and negative electrode device, can be multiple in parallel；The band needle point is for corner is star-like, hexagonal is star-like, anise is star-like and needle-like type；The negative electrode device include dielectric impedance and stainless steel wire, can circular row around positive pole stainless steel bar；The block media is quartz, ceramics, polytetrafluoroethylene (PTFE)；The fixed mount can be crisscross fixer or cylinder fixed mount.The air distribution system is provided with background source of the gas, exhaust gas source, bubbling device, flowmeter, gas buffer.The Tail gas measuring and retracting device are provided with sampling bottle and reversal valve, flowmeter, tail gas absorption bottle, and the tail gas absorption bottle multiple can be connected.
A kind of corona-dielectric barrier discharge low-temperature plasma purification waste gas method, reacted device gas circuit detection, the setting of reactor condition of work, the clearing up of organic exhaust gas, stripping and vent gas treatment Four processes realize that organic waste-gas purification is processed.Methods described is comprised the following steps that：
（1）Reactor gas circuit is detected
The（1）Step, first opens steel cylinder, adjusts the MPa of pressure-reducing valve 0.2~1.2, and background gas are passed through by spinner flowmeter, and its flow velocity is 0.7~3.0
L/min, treats that tail gas returns oxygen or inert gas.
（2）Reactor condition of work sets
The（1）After the completion of step, corona-dielectric barrier discharge pipe quantity 1~6 is selected, then operating voltage is set for 8~11KV, turned on the power, ozone concentration is 60 ~ 136ppm in ozone analyzer device detection reactor, high energy particle stabilization is produced in showing reactor.
（3）Organic exhaust gas are cleared up
The（1）After the completion of step,（1）Organic exhaust gas are passed through on the basis of step, by organic exhaust gas flow velocity（L/min）：Background gas air quantity（L/min）Than being 1：70~100 L/min, after regulating organic exhaust gas flow velocity and background gas air quantity, after 20~100min of discharge process, close reactor power supply.The organic exhaust gas can be single organic gas, or mixed gas.
（4）Stripping and vent gas treatment
The（2）After the completion of step, spinner flowmeter is adjusted, continue to be passed through background gas, coutroi velocity is 3.0~5.0
L/min, continues residual gas in stripping reactor；Stripping gas is imported into tail gas absorption liquid in device for recovering tail gas, after ozone concentration is up to standard in detection tail gas, air valve is closed.The tail gas absorption liquid includes supersaturation Ca (OH)2, the saturation KI aqueous solution or supersaturation Ca (OH)2With the mixed aqueous solution of KI.
The present invention mainly has the following effects using after such scheme：
（1）, using corona and dielectric impedance collaboration electric discharge, high energy particle yield is big, improves exhaust gas decomposition efficiency for the present invention.Corona and dielectric impedance act synergistically, high energy particle such as electronics, ion, molecule, neutral atom, excited atom, photon and free radical etc., increase reactor high energy particle quantity and energy, only unit energy ozone growing amount is up to 52.14 ~ 68.14 in reactor
Mg/kwh, the active particle of sufficient amount and energy is provided for oxidation organic exhaust gas, increased the effective collision number of times with contaminant molecule, effectively shortens the waste gas purification time, and the degradation rate of organic exhaust gas improves 30~45%.
（2）The present invention reduces initial breakdown voltage using the collaboration electric discharge of corona dielectric impedance, operates safer.Initial breakdown voltage reduction promotes operation safer.The starting voltage that Single Medium barrier discharge then needs is higher, and its corona discharging area is small, and efficiency is low；Apparatus of the present invention initial discharge voltage is reduced to 7.8kV by 10kV, and relatively low starting voltage reduces the degree of danger of operating discharge, also ensures the generation of reactor hot stall, is conducive to industrialized production and the application of equipment.
（3）The reactor that the present invention is used is designed as dielectric barrier discharge pipe multi-parallel casing configuration, reduces the operating cost of organic waste-gas purification.The many cloudy electrode structural designs of dielectric barrier discharge Guan Weiyi sun of use, advantageously reduce windage, improve organic waste-gas purification, and dielectric barrier discharge pipe is multi-parallel casing configuration, cabinet space is effectively utilized, idle device operation production cost, easy access and maintenance is reduced.
（4）The present invention with air as source of the gas, cheap and easy to get, simple to operate, ozone free loss, method environmental protection.
Brief description of the drawings
The structural representation of Fig. 1 coronas of the invention-dielectric barrier discharge pipe.
Fig. 2 coronas of the invention-dielectric barrier discharge low-temperature plasma purifier system.
Label is described as follows in figure：The 2- air inlet 3- negative electrode devices 4- band adjustable positive pole stainless steel bar 5- crisscross fixers 6- cylinders fixed mount 7- earth electrodes 8- high voltage power supply wire terminals of needle point of 1- gas outlets.
Specific embodiment
Specific embodiment is described below, and the present invention is further described.
Embodiment1。
A kind of corona-dielectric barrier discharge low-temperature plasma purification exhaust device is made up of reaction of low temperature plasma device, air distribution system and Tail gas measuring and retracting device.In reaction of low temperature plasma device, the dielectric impedance of corona-dielectric barrier discharge pipe negative electrode device is the quartz ampoule of internal diameter 5mm, and is placed on the stainless steel wire of a diameter of 3mm；Band the needle point adjustable a diameter of 4mm of positive pole stainless steel bar, the cm of radical length 25；Band needle point is anistree star-like, and spacing is 16mm；Electrode spacing is 8mm；4 negative electrode device rings are listed in the band adjustable positive pole stainless steel bar of needle point；Reactor positive electrode connects ac high voltage source, negative electrode ground connection.Air distribution system source of the gas is air.Tail gas absorption bottle is 3 series connection.
A kind of corona-dielectric barrier discharge low-temperature plasma purification waste gas method is as follows：
（1）Reactor gas circuit is detected
The（1）Step, first opens steel cylinder, adjusts the MPa of pressure-reducing valve 0.4, and background gas air is passed through by spinner flowmeter, and its flow velocity is 1.5L/min, treats that device for recovering tail gas has steady and continuous bubble to occur, and shows that plasma reactor ventilation is smooth.
（2）Reactor condition of work sets
The（1）After the completion of step, it is 1 to select corona-dielectric barrier discharge pipe quantity, then sets operating voltage for 10KV, is turned on the power, O in ozone analyzer device detection reactor3Concentration is 118ppm, and high energy particle stabilization is produced in showing reactor.
（3）Organic exhaust gas are cleared up
The（2）After the completion of step,（1）On the basis of step, organic single waste gas acetone is passed through, by organic exhaust gas flow velocity（L/min）：Background gas air quantity（L/min）Than being 1：75 L/min, after regulating organic exhaust gas flow velocity and background gas air quantity, after discharge process 30min, close reactor power supply.The rate of clearing up of single corona-dielectric barrier discharge tube discharge degraded acetone is 37.32%.
（4）Stripping and vent gas treatment
The（3）After the completion of step, spinner flowmeter is adjusted, continue to be passed through background gas air, coutroi velocity is 4.0 L/min, continues residual gas in stripping reactor；Stripping gas is imported into tail gas absorption liquid in device for recovering tail gas, after ozone concentration is up to standard in detection tail gas, air valve is closed.
Embodiment2。
A kind of corona-dielectric barrier discharge low-temperature plasma purification waste gas method and device, with embodiment 1, wherein：
The（1）Step, adjusts the MPa of pressure-reducing valve 0.2, and the flow rate set of background gas air is 0.7L/min.
The（2）Step, setting operating voltage is 8KV, and O is detected in reactor3Concentration is 59ppm.
The（3）Step, organic exhaust gas flow velocity（L/min）：Background gas air quantity（L/min）Than being 1：70 L/min, the discharge process time is 60min, and the rate of clearing up of acetone is 18.3%.
The（4）Step, air coutroi velocity is 3.0 L/min.
Embodiment3。
A kind of corona-dielectric barrier discharge low-temperature plasma purification waste gas method and device, with embodiment 1, wherein：
The（1）Step, adjusts the MPa of pressure-reducing valve 1.2, and the flow rate set of background gas air is 3.0L/min.
The（2）Step, setting operating voltage is 11KV, and O is detected in reactor3Concentration is 136ppm.
The（3）Step, organic exhaust gas flow velocity（L/min）：Background gas air quantity（L/min）Than being 1：100 L/min, the discharge process time is 20min, and the rate of clearing up of acetone is 22.5%.
The（4）Step, air coutroi velocity is 5.0 L/min.
Claims (8)
1. a kind of corona-dielectric barrier discharge low-temperature plasma purifies exhaust device, including reaction of low temperature plasma device, air distribution system and Tail gas measuring and retracting device are constituted.
2. a kind of corona according to claim 1-dielectric barrier discharge low-temperature plasma purifies exhaust device, it is characterised in that the reaction of low temperature plasma device is provided with high-voltage ac power, corona-dielectric barrier discharge pipe and fixed mount；
The corona-dielectric barrier discharge pipe includes the band adjustable positive pole stainless steel bar of needle point and negative electrode device, can be multiple in parallel；The band needle point is for corner is star-like, hexagonal is star-like, anise is star-like and needle-like type；
The negative electrode device include dielectric impedance and stainless steel wire, can circular row around positive pole stainless steel bar；
The block media is quartz, ceramics, polytetrafluoroethylene (PTFE)；The fixed mount can be crisscross fixer or cylinder fixed mount.
3. a kind of corona according to claim 1-dielectric barrier discharge low-temperature plasma purifies exhaust device, it is characterised in that the air distribution system is provided with background source of the gas, exhaust gas source, bubbling device, flowmeter, gas buffer.
4. a kind of corona according to claim 1-dielectric barrier discharge low-temperature plasma purifies exhaust device, it is characterized in that, the Tail gas measuring and retracting device are provided with sampling bottle and reversal valve, flowmeter, tail gas absorption bottle, and the tail gas absorption bottle multiple can be connected.
5. a kind of corona-dielectric barrier discharge low-temperature plasma purification waste gas method, it is characterised in that methods described is comprised the following steps that：
（1）Reactor gas circuit is detected：The（1）Step, first opens steel cylinder, regulation pressure-reducing valve 0.2~1.2 MPa, background gas are passed through by spinner flowmeter, its flow velocity is 0.7~3.0 L/min, treat that device for recovering tail gas has steady and continuous bubble to occur, show that plasma reactor ventilation is smooth, the background gas are air, N2、O2Or inert gas；
（2）Reactor condition of work sets：The（1）After the completion of step, corona-dielectric barrier discharge pipe quantity 1~6 is selected, then operating voltage is set for 8~11KV, turned on the power, O in ozone analyzer device detection reactor3Concentration is 60 ~ 136ppm, and high energy particle stabilization is produced in showing reactor；
（3）Organic exhaust gas are cleared up：The（1）After the completion of step,（1）Organic exhaust gas are passed through on the basis of step, by organic exhaust gas flow velocity（L/min）：Background gas air quantity（L/min）Than being 1：70~100 L/min, after regulating organic exhaust gas flow velocity and background gas air quantity, after 20~100min of discharge process, close reactor power supply, and the organic exhaust gas can be single organic gas, or mixed gas；
（4）Stripping and vent gas treatment：The（2）After the completion of step, spinner flowmeter is adjusted, continue to be passed through background gas, coutroi velocity is 3.0~5.0 L/min, continues residual gas in stripping reactor；Stripping gas is imported into tail gas absorption liquid in device for recovering tail gas, after ozone concentration is up to standard in detection tail gas, air valve is closed, the tail gas absorption liquid includes supersaturation Ca (OH)2, the saturation KI aqueous solution or supersaturation Ca (OH)2With the mixed aqueous solution of KI.
6. a kind of corona-dielectric barrier discharge low-temperature plasma purification waste gas method, it is characterised in that methods described is comprised the following steps that：
（1）Reactor gas circuit is detected：The（1）Step, first opens steel cylinder, regulation pressure-reducing valve 0.2~1.2 MPa, background gas are passed through by spinner flowmeter, its flow velocity is 0.7~3.0 L/min, treat that device for recovering tail gas has steady and continuous bubble to occur, show that plasma reactor ventilation is smooth, the background gas are air, N2、O2Or inert gas；
（2）Reactor condition of work sets：The（1）After the completion of step, corona-dielectric barrier discharge pipe quantity 1~6 is selected, then operating voltage is set for 8~11KV, turned on the power, O in ozone analyzer device detection reactor3Concentration is 60 ~ 136ppm, and high energy particle stabilization is produced in showing reactor；
（3）Organic exhaust gas are cleared up：The（1）After the completion of step,（1）Organic exhaust gas are passed through on the basis of step, by organic exhaust gas flow velocity（L/min）：Background gas air quantity（L/min）Than being 1：70~100 L/min, after regulating organic exhaust gas flow velocity and background gas air quantity, after 20~100min of discharge process, close reactor power supply, and the organic exhaust gas can be single organic gas, or mixed gas；
（4）Stripping and vent gas treatment：The（2）After the completion of step, spinner flowmeter is adjusted, continue to be passed through background gas, coutroi velocity is 3.0~5.0 L/min, continues residual gas in stripping reactor；Stripping gas is imported into tail gas absorption liquid in device for recovering tail gas, after ozone concentration is up to standard in detection tail gas, air valve is closed, the tail gas absorption liquid includes supersaturation Ca (OH)2, the saturation KI aqueous solution or supersaturation Ca (OH)2With the mixed aqueous solution of KI.
7. corona-dielectric barrier discharge low-temperature plasma purifies waste gas method according to claim 5, it is characterised in that：
The（1）Step, adjusts the MPa of pressure-reducing valve 0.2, and the flow rate set of background gas air is 0.7L/min；
The（2）Step, setting operating voltage is 8KV, and O is detected in reactor3Concentration is 59ppm；
The（3）Step, organic exhaust gas flow velocity（L/min）：Background gas air quantity（L/min）Than being 1：70 L/min, the discharge process time is 60min, and the rate of clearing up of acetone is 18.3%；
The（4）Step, air coutroi velocity is 3.0 L/min.
8. corona-dielectric barrier discharge low-temperature plasma purifies waste gas method according to claim 5, it is characterised in that：
The（1）Step, adjusts the MPa of pressure-reducing valve 1.2, and the flow rate set of background gas air is 3.0L/min；
The（2）Step, setting operating voltage is 11KV, and O is detected in reactor3Concentration is 136ppm；
The（3）Step, organic exhaust gas flow velocity（L/min）：Background gas air quantity（L/min）Than being 1：100 L/min, the discharge process time is 20min, and the rate of clearing up of acetone is 22.5%；
The（4）Step, air coutroi velocity is 5.0 L/min.
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Cited By (6)
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| CN108298506A (en) * | 2018-04-09 | 2018-07-20 | 贵州电网有限责任公司 | Oil immersed type sulfur hexafluoride degradation treatment device based on medium discharge and processing method |
| CN108421638A (en) * | 2018-01-19 | 2018-08-21 | 河海大学常州校区 | Catalytic association corona and dielectric barrier discharge air purification regulator control system |
| CN110327749A (en) * | 2019-07-18 | 2019-10-15 | 重庆工商大学 | A kind of method of low-temperature plasma degradation dimethylbenzene and synchronous fixed nitrogen |
| CN110572923A (en) * | 2019-07-19 | 2019-12-13 | 中国石油大学(华东) | Recyclable coaxial DBD plasma reactor for liquid modification |
| CN111111920A (en) * | 2019-12-31 | 2020-05-08 | 深圳市力德环保工程有限公司 | Electrode structure before purification of dust-containing VOCs waste gas |
| CN113304584A (en) * | 2021-06-24 | 2021-08-27 | 上海电气集团国控环球工程有限公司 | Self-electricity regeneration type magnetic cyclone separation plasma coking tail waste gas purification system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108421638A (en) * | 2018-01-19 | 2018-08-21 | 河海大学常州校区 | Catalytic association corona and dielectric barrier discharge air purification regulator control system |
| CN108298506A (en) * | 2018-04-09 | 2018-07-20 | 贵州电网有限责任公司 | Oil immersed type sulfur hexafluoride degradation treatment device based on medium discharge and processing method |
| CN110327749A (en) * | 2019-07-18 | 2019-10-15 | 重庆工商大学 | A kind of method of low-temperature plasma degradation dimethylbenzene and synchronous fixed nitrogen |
| CN110572923A (en) * | 2019-07-19 | 2019-12-13 | 中国石油大学(华东) | Recyclable coaxial DBD plasma reactor for liquid modification |
| CN111111920A (en) * | 2019-12-31 | 2020-05-08 | 深圳市力德环保工程有限公司 | Electrode structure before purification of dust-containing VOCs waste gas |
| CN113304584A (en) * | 2021-06-24 | 2021-08-27 | 上海电气集团国控环球工程有限公司 | Self-electricity regeneration type magnetic cyclone separation plasma coking tail waste gas purification system |
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Application publication date: 20170630 |
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