CN102814109A - Device for waste gas treatment based on dielectric barrier corona discharge plasmas - Google Patents
Device for waste gas treatment based on dielectric barrier corona discharge plasmas Download PDFInfo
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- CN102814109A CN102814109A CN2012103123555A CN201210312355A CN102814109A CN 102814109 A CN102814109 A CN 102814109A CN 2012103123555 A CN2012103123555 A CN 2012103123555A CN 201210312355 A CN201210312355 A CN 201210312355A CN 102814109 A CN102814109 A CN 102814109A
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- corona discharge
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Abstract
The invention discloses a device for waste gas treatment based on dielectric barrier corona discharge plasmas. The device comprises a sealed shell, the shell is internally separated into a gas buffer cavity and a treatment cavity, an inlet communicated with the gas buffer chamber cavity and an outlet communicated with the treatment cavity are respectively arranged on the shell, the gas buffer chamber cavity is composed of the bottom of the shell and a grounding integrated board, a plurality of gas through holes are arranged on the grounding integrated board, the treatment cavity is composed of the grounding integrated board and an integrated board, an insulation board is arranged on each of the upper side and the lower side of the integrated board, and discharge units in array distribution are arranged on the integrated board. The speed of gas entering a plasmas area is decreased by the aid of the buffer cavity, so that the gas sufficiently reacts with the plasmas in the treatment cavity, and treatment efficiency is improved; and the effective treatment area is increased greatly by the arrayed discharge structure.
Description
Technical field
The invention belongs to the emission-control equipment technical field, relate to a kind of device of handling waste gas based on the dielectric impedance corona discharge plasma.
Background technology
Along with the developing rapidly and improve of plasma technique, the application of lower temperature plasma technology is increasingly extensive.Simultaneously, along with improving constantly of social industrialized level, the three wastes (waste liquid, waste gas, solid waste) pollute also more and more serious.Yet the improvement technology of the three wastes far lags behind industrialization and produces the speed of polluting.Usually contain a large amount of poisonous and harmful substances in the three wastes, be difficult to once thoroughly administer.For this reason, seek a kind of conveniently enforcement, economical and practical method and handle these organic pollutions, pernicious gas (like H
2S, CS
2, SO
2, hydrocarbon such as formaldehyde) etc. material be a long-term very significant job.In existing existing processing method, burning method is handled organic pollution needs very high temperature, has so both caused the waste of the energy, can bring serious secondary pollution and serious etching problem simultaneously.Methods such as Production by Catalytic Combustion Process, absorption-desorption method are in problems such as processing capacity, vapour lock, poor efficiency, universality differences.The dielectric barrier discharge pipe is handled the processing method before having improved greatly, has improved treatment effeciency, extensively receives people's favor.But effective processing area of the method is little, and multitube discharge is asynchronous, and noise is big, to drawbacks limit such as power requirement height its fast development.
A large amount of experimental studies shows that profuse active particle is arranged in dielectric barrier discharge plasma both at home and abroad, like a large amount of O
3, the OH free radical, be in the N of excitation state
2And N
+Deng, also have high energy particle in large quantities in addition, like electronics, and the ultraviolet ray of following discharge.Complicated reaction can take place with the many harmful components in the environment in these active particles, high energy particle and ultraviolet ray; With macromolecules degradation is little molecule; Make oxious component in the environment not have to poison or toxicity declines to a great extent through abundant redox reaction and strong ultraviolet ray, can play good sterilization functions simultaneously.But large tracts of land high efficiency treating apparatus is needed development badly.
Summary of the invention
The problem that the present invention solves is to provide a kind of and handles the device of waste gas based on the dielectric impedance corona discharge plasma, and this device can be used for large tracts of land under the atmospheric pressure, high efficiency, handles waste gas easily.
The present invention realizes through following technical scheme:
A kind of device of handling waste gas based on the dielectric impedance corona discharge plasma; The housing that comprises sealing; Be separated into gas buffer chamber and process chamber in the housing, offer the gas access that is connected with the gas buffer chamber, the gas vent that is connected with process chamber on the housing respectively;
The gas buffer chamber is made up of housing bottom and ground connection circuit board, offers a plurality of gas via-holes on the ground connection circuit board;
Process chamber is made up of ground connection circuit board and circuit board, and the both sides up and down of circuit board are provided with insulation board; Circuit board is provided with and is the discharge cell that array distributes; Each discharge cell comprises high-field electrode, block media and ground connection screen cloth electrode from inside to outside, and the three fits tightly, and the upper end of high-field electrode is fixedly connected with circuit board, the lower end insulation-encapsulated, and ground connection screen cloth electrode is connected with the ground connection circuit board; Circuit board is connected with high-voltage ac power.
Described high-field electrode is fixedly connected through screw thread with circuit board, is parallel to each other between the discharge cell.
Voltage magnitude between described high-field electrode and the ground connection screen cloth electrode is 4.5～6.5kV.
Described discharge cell also is provided with the high-voltage probe that measuring voltage is used between the two poles of the earth, measure the noninductive resistance of discharge current, and the waveform of voltage, electric current and numerical value writes down and preserve with oscillograph.
Described insulation board is the thick polyfluortetraethylene plate of 2～5mm, and the lower end of high-field electrode encapsulates with polyfluortetraethylene plate.
Described circuit board is the thick corrosion resistant plate of 2～5mm, and high-field electrode is the stainless steel bar of diameter 5～10mm, and the ground connection circuit board is the thick corrosion resistant plate of 2～5mm.
Described block media is the polyfluortetraethylene pipe of wall thickness 1～1.5mm; Ground connection screen cloth electrode is 20～25 purpose stainless steel mesh, is close to be wrapped in the block media outer surface, and the diameter of its stainless steel wire is 0.3～0.5mm.
Described housing is the lucite cavity.
The quantity of described discharge cell is 1～40.
Compared with prior art, the present invention has following beneficial technical effects:
Device based on dielectric impedance corona discharge plasma processing waste gas provided by the invention utilizes cushion chamber to reduce the speed that gas gets into plasma slab (being process chamber), to reach abundant and plasma reaction in process chamber, improves treatment effeciency; And the discharging structure of employing array has increased effective processing area greatly, improves treatment effeciency; Because the sandwich design of discharge cell makes the power of whole discharge loss lower, has practiced thrift electric cost greatly; The universality of handling gas is strong; In addition, in order to accelerate treatment effeciency, can also use with some catalyst are collaborative such as the organic exhaust gas class.Therefore, this device can reach the practical requirement of plasma treatment waste gas, has potential application prospects.
Device based on dielectric impedance corona discharge plasma processing waste gas provided by the invention, processing procedure is carried out at normal temperatures and pressures, does not need the expensive low-voltage equipment of cost; Effectively processing area is big, and discharge cell can increase or reduce according to the actual requirements, and is so that regulate actual required processing area, easy to maintenance.
Provided by the inventionly handle the device of waste gas based on the dielectric impedance corona discharge plasma, the discharge synchronism of discharge cell, stability, uniformity are better, and it is abundant to produce activated product.In the plasma abundant active particle be processed gas generation series of complex physico-chemical, mostly end product is innoxious gas componant.
Is example with formaldehyde as process object, gaseous phase free radical reaction indirectly, i.e. and active OH or O free radical and HCHO molecular collision reaction in the plasma, promptly
HCHO+OH→H
2O+CHO
HCHO+O→OH+CHO
The CHO free radical that generates finally generates CO through following reaction
2And H
2O.
CHO+H→H
2+CO
CHO+O
2→CO+OH
CHO+OH→H
2O+CO
CHO+H
2O→OH+H+CO
2
CHO+O→OH+CO
CHO+O→H+CO
2
CO+O→CO
2
CO+OH→CO
2+H
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is that discharge cell of the present invention is arranged sketch map;
Fig. 3 is the structural representation of discharge cell of the present invention;
Fig. 4 is the side view of discharge cell of the present invention;
Fig. 5 is that the circuit of discharge cell of the present invention connects sketch map;
Fig. 6 is a plasma treatment waste gas flow chart.
Wherein, 1 is insulation board, and 2 is circuit board, and 3 is the ground connection circuit board, and 4 is the gas buffer chamber, and 5 is high-field electrode, and 6 is ground connection screen cloth electrode, and 7 is block media, and 8 is process chamber, and 9 is the gas access, and 10 is gas vent.
The specific embodiment
The present invention provides the device of handling waste gas based on the dielectric impedance corona discharge plasma, and this device is formed system by plasma generation system and gas buffered.The plasma generation system utilizes the dielectric impedance corona discharge of array (Dielectric Barrier Corona Discharge; Abbreviate DBCD as) produce plasma, the effective area of plasma treatment waste gas can increase according to the actual requirements easily.Below in conjunction with concrete embodiment the present invention is done further detailed description, said is to explanation of the present invention rather than qualification.
Referring to Fig. 1～Fig. 3; A kind ofly handle the device of waste gas, comprise the housing of sealing, be separated into gas buffer chamber 4 and process chamber 8 in the housing based on the dielectric impedance corona discharge plasma; Offer the inlet 9 that is connected with gas buffer chamber 4 on the housing respectively, the outlet 10 that is connected with process chamber 8;
Gas buffer chamber 4 is made up of housing bottom and ground connection circuit board 3, offers a plurality of gas via-holes on the ground connection circuit board 3;
Process chamber 8 is made up of ground connection circuit board 3 and circuit board 2, and the both sides up and down of circuit board 2 are respectively equipped with insulation board 1; Circuit board 2 is provided with the discharge cell that is array distribution; Each discharge cell comprises high-field electrode 5, block media 7 and ground connection screen cloth electrode 6 from inside to outside, and the three fits tightly, and the upper end of high-field electrode 5 is fixedly connected with circuit board 2, the lower end insulation-encapsulated, and ground connection screen cloth electrode 6 is connected with ground connection circuit board 3; Circuit board 2 is connected with external power supply.
Its core of this device is a discharge cell, and promptly the dielectric impedance corona discharge produces the unit of plasma.The quantity of unit be 1～40 adjustable, increase effective processing area, being arranged in of discharge cell (as shown in Figure 2) on the circuit board 2 also can be arranged by other shape.
Like Fig. 3, shown in Figure 4, discharge cell is made up of high-field electrode 5, block media 7 and ground connection screen cloth electrode 6 utmost points, and three part strictnesses are close to, and forms sandwich structure.
Concrete; High-field electrode 5 is the stainless steel bar of diameter 5～10mm (preferred 6mm), long 150mm; One end has the long screw thread of 10mm; Be used to be integrated into circuit board 2 (specifically adopting the thick corrosion resistant plate of 2～5mm), also can play and fix and the strict parallel effect of assurance discharge cell, the other end is used the polytetrafluoroethylene (PTFE) insulation-encapsulated; The block media 7 of high-field electrode is the thick PTFE tube of 1mm, and inside and outside footpath is respectively 6mm and 8mm, and long is 150mm; Ground connection screen cloth electrode 6 (selecting stainless steel ground connection screen cloth for use) is 20～25 orders (preferred 20 orders), and the diameter of stainless steel wire is 0.3～0.5mm (preferred 0.5mm), and screen cloth is close to and is wrapped in the block media outer surface, and the length of winding is 130mm.The high-field electrode of all discharge cells is integrated on the circuit board 2 through the end of thread, and ground connection screen cloth electrode is integrated on the ground connection circuit board 3 and (specifically adopts the thick corrosion resistant plate of 2～5mm).
Concrete, the circuit connection diagram of discharge cell is as shown in Figure 5, and the power supply among the figure is the high-voltage ac power (HVAC) that is used to produce low temperature plasma.Also be provided with between discharge cell the two poles of the earth and measure the high-voltage probe that discharge voltage is used, measure the noninductive resistance of discharge current, and the waveform of voltage, electric current and numerical value write down and preserve with oscillograph, also promptly: discharge voltage is obtained by high-voltage probe; Discharge current records through the noninductive resistance of connecting with the ground connection screen cloth; Discharge power obtains like figure through combine Lee's Sa with the storehouse volt property of ground connection screen cloth series capacitance, and oscillograph is used for wave recording and obtain related data.All discharge cell array parallel connections.
According to the needs of handling waste gas, HVAC provides sinusoidal wave applied voltage, and each discharge cell is executed voltage magnitude outside can realize discharge for 4.5kV-6.5k V, noiseless, and it is uniform and stable to discharge.According to the actual requirements, can increase the number of discharge cell successively, discharge still can realize easily, and uniform and stable noiseless.And no matter be single discharge cell or whole discharge arrays, discharge power is less, and this can save electric energy, reduces cost.
Provide a concrete embodiment below:
Handle the device of waste gas based on the dielectric impedance corona discharge plasma; Housing adopts the lucite cavity of sealing; Being about to discharge portion places in the lucite cavity of a sealing; Cavity is divided into gas buffer chamber and process chamber two parts then: the gas buffer chamber is made up of housing bottom and ground connection circuit board; Process chamber is made up of ground connection circuit board and circuit board, and establishes PTFE insulation board (preventing creeping discharge) in the both sides up and down of circuit board, and is connected with gas access (having valve) and gas vent respectively; Open the aperture that internal diameter as much as possible is 1.5mm on the ground connection circuit board simultaneously, even dispersion ground gets into process chamber from the gas buffer chamber in order to gas.
The discharge cell for preparing sandwich structure then, especially the selection of block media, ground connection screen cloth electrode is relevant with discharge performance in the discharge cell, can in such scheme, select suitable combination according to actual needs; The high-field electrode and the ground connection screen cloth electrode of all discharge cells are integrated in respectively on circuit board and the ground connection circuit board.
Turn on the electricity according to the circuit theory diagrams of discharge cell again; Referring to flow chart shown in Figure 6, after circuit connects, open the air inlet valve; When waste gas feeds from the gas access; In the gas buffer chamber, cushioning, is that the aperture of 1.5mm makes waste gas get into uniformly in the process chamber from the gas buffer chamber via diameters a large amount of on the ground connection circuit board 3, and discharge cell produces plasma through the dielectric impedance corona discharge; In the plasma abundant active particle be processed gas generation series of complex physico-chemical, mostly end product is innoxious gas componant.Detect the concentration of handling back gas at exhaust outlet, regulate strength of discharge simultaneously, improve treatment effeciency.
Claims (9)
1. device of handling waste gas based on the dielectric impedance corona discharge plasma; It is characterized in that; The housing that comprises sealing; Be separated into gas buffer chamber (4) and process chamber (8) in the housing, offer the gas access (9) that is connected with gas buffer chamber (4) on the housing respectively, the gas vent (10) that is connected with process chamber (8);
Gas buffer chamber (4) is made up of housing bottom and ground connection circuit board (3), and the ground connection circuit board offers a plurality of gas via-holes on (3);
Process chamber (8) is made up of ground connection circuit board (3) and circuit board (2), and the both sides up and down of circuit board (2) are provided with insulation board (1); Circuit board (2) is provided with and is the discharge cell that array distributes; Each discharge cell comprises high-field electrode (5), block media (7) and ground connection screen cloth electrode (6) from inside to outside; The three fits tightly; The upper end of high-field electrode (5) is fixedly connected with circuit board (2); The lower end insulation-encapsulated, ground connection screen cloth electrode (6) is connected with ground connection circuit board (3); Circuit board (2) is connected with high-voltage ac power.
2. the device based on dielectric impedance corona discharge plasma processing waste gas as claimed in claim 1 is characterized in that described high-field electrode (5) is fixedly connected through screw thread with circuit board (2), is parallel to each other between the discharge cell.
3. the device based on dielectric impedance corona discharge plasma processing waste gas as claimed in claim 1 is characterized in that the voltage magnitude between described high-field electrode (5) and the ground connection screen cloth electrode (6) is 4.5～6.5kV.
4. the device of handling waste gas based on the dielectric impedance corona discharge plasma as claimed in claim 3; It is characterized in that; Described discharge cell also is provided with the high-voltage probe that measuring voltage is used between the two poles of the earth; Measure the noninductive resistance of discharge current, and the waveform of voltage, electric current and numerical value write down and preserve with oscillograph.
5. the device based on dielectric impedance corona discharge plasma processing waste gas as claimed in claim 1 is characterized in that described insulation board (1) is the thick polyfluortetraethylene plate of 2～5mm, and the lower end of high-field electrode (5) encapsulates with polyfluortetraethylene plate.
6. the device of handling waste gas based on the dielectric impedance corona discharge plasma as claimed in claim 1; It is characterized in that; Described circuit board (2) is the thick corrosion resistant plate of 2～5mm; High-field electrode (5) is the stainless steel bar of diameter 5～10mm, and ground connection circuit board (3) is the thick corrosion resistant plate of 2～5mm.
7. the device based on dielectric impedance corona discharge plasma processing waste gas as claimed in claim 1 is characterized in that described block media (7) is the polyfluortetraethylene pipe of wall thickness 1～1.5mm; Ground connection screen cloth electrode (6) is 20～25 purpose stainless steel mesh, is close to be wrapped in the block media outer surface, and the diameter of its stainless steel wire is 0.3～0.5mm.
8. the device based on dielectric impedance corona discharge plasma processing waste gas as claimed in claim 1 is characterized in that described housing is the lucite cavity.
9. the device based on dielectric impedance corona discharge plasma processing waste gas as claimed in claim 1 is characterized in that the quantity of described discharge cell is 1～40.
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| CN103653200A (en) * | 2013-11-29 | 2014-03-26 | 南京航空航天大学 | Cold plasma pesticide degrading instrument |
| CN103785254A (en) * | 2014-02-19 | 2014-05-14 | 徐炎华 | Treatment method for automobile coating waste gas |
| CN103880126A (en) * | 2012-12-21 | 2014-06-25 | 陈晓波 | Surge-controllable low-temperature plasma discharge water treatment pipeline structure |
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| CN103653200A (en) * | 2013-11-29 | 2014-03-26 | 南京航空航天大学 | Cold plasma pesticide degrading instrument |
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