CN102814109B - 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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- CN102814109B CN102814109B CN201210312355.5A CN201210312355A CN102814109B CN 102814109 B CN102814109 B CN 102814109B CN 201210312355 A CN201210312355 A CN 201210312355A CN 102814109 B CN102814109 B CN 102814109B
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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 emission-control equipment technical field, relate to a kind of device of processing waste gas based on 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.Meanwhile, along with improving constantly of social industrialized level, the three wastes (waste liquid, waste gas, solid waste) pollute also more and more serious.But the improvement technology of the three wastes far lags behind industrialization and produces the speed of polluting.In the three wastes, usually contain a large amount of poisonous and harmful substances, be difficult to once thoroughly administer.For this reason, seek a kind of conveniently enforcement, economical and practical method and process these organic pollutions, pernicious gas (as H
2s, CS
2, SO
2, the hydrocarbon such as formaldehyde) etc. material be a long-term very significant job.In existing existing processing method, burning method is processed organic pollution needs very high temperature, so both causes the waste of the energy, can bring serious secondary pollution and serious etching problem simultaneously.The methods such as Production by Catalytic Combustion Process, absorption-desorption method are in the problem such as processing capacity, vapour lock, poor efficiency, universality be poor.Dielectric barrier discharge pipe is processed the processing method before greatly having improved, and has improved treatment effeciency, is extensively subject to people's favor.But effective processing area of the method is little, multitube electric discharge is asynchronous, and noise is large, to drawbacks limit such as power requirement height its fast development.
A large amount of experimental studies shows in dielectric barrier discharge plasma, there is very abundant active particle both at home and abroad, as a large amount of O
3, OH free radical, N in excitation state
2and N
+deng, also have in addition high energy particle in large quantities, as electronics, and follow the ultraviolet ray of electric discharge.Can there is complicated reacting with the many harmful components in environment in these active particles, high energy particle and ultraviolet ray, be little molecule by macromolecules degradation, make oxious component in environment without poisoning or toxicity declines to a great extent by abundant redox reaction and strong ultraviolet ray, can play good sterilization functions simultaneously.But large area 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 device of processing waste gas based on dielectric impedance corona discharge plasma, and this device can be used for large area under atmospheric pressure, high efficiency, processes waste gas easily.
The present invention is achieved through the following technical solutions:
A kind of device of processing waste gas based on dielectric impedance corona discharge plasma, comprise the housing of sealing, in housing, be separated into gas buffer chamber and process chamber, on housing, offer respectively the gas access being connected with gas buffer chamber, the gas vent being connected with process chamber;
Gas buffer chamber is made up of housing bottom and ground connection circuit board, offers multiple gas via-holes on 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 three fits tightly, and the upper end of high-field electrode is fixedly connected with circuit board, lower end insulation-encapsulated, and ground connection screen cloth electrode is connected with ground connection circuit board; Circuit board is connected with high-voltage ac power.
Described high-field electrode is fixedly connected with by screw thread with circuit board, between discharge cell, is parallel to each other.
Voltage magnitude between described high-field electrode and ground connection screen cloth electrode is 4.5～6.5kV.
Between described discharge cell the two poles of the earth, be also provided with the high-voltage probe that measuring voltage is used, measure the noninductive resistance of discharge current, and the waveform of voltage, electric current and numerical value record and preserve with oscillograph.
Described insulation board is the polyfluortetraethylene plate that 2～5mm is thick, and the lower end of high-field electrode encapsulates with polyfluortetraethylene plate.
Described circuit board is the corrosion resistant plate that 2～5mm is thick, and high-field electrode is the stainless steel bar of diameter 5～10mm, and ground connection circuit board is the corrosion resistant plate that 2～5mm is thick.
Described block media is the polyfluortetraethylene pipe of wall thickness 1～1.5mm; Ground connection screen cloth electrode is 20～25 object stainless steel mesh, is close to and is wrapped in block media outer surface, and the diameter of its stainless steel wire is 0.3～0.5mm.
Described housing is lucite cavity.
The quantity of described discharge cell is 1～40.
Compared with prior art, the present invention has following useful technique effect:
The device of processing waste gas based on dielectric impedance corona discharge plasma provided by the invention, utilizes cushion chamber reduction gas to enter the speed of plasma slab (being process chamber), to reach abundant in process chamber and plasma reaction, improves treatment effeciency; And the discharging structure of employing array has increased effective processing area greatly, improve treatment effeciency; Due to the sandwich design of discharge cell, make the power of whole discharge loss lower, greatly save electric cost; The universality of processing gas is strong; In addition, in order to accelerate the treatment effeciency such as organic exhaust gas class, can also use with some catalyst are collaborative.Therefore, this device can reach the real requirement of plasma treatment waste gas, has potential application prospect widely.
The device of processing waste gas based on dielectric impedance corona discharge plasma provided by the invention, processing procedure is carried out at normal temperatures and pressures, does not need the low-voltage equipment of cost costliness; Effectively processing area is large, and discharge cell can increase according to the actual requirements or reduce, to regulate actual required processing area, easy to maintenance.
Provided by the inventionly process the device of waste gas based on dielectric impedance corona discharge plasma, the electric discharge synchronism of discharge cell, stability, uniformity are better, produce activated product abundant.Abundant active particle and the physical-chemical reaction of processed gas generation series of complex in plasma, end product mostly is innoxious gas componant.
Be example take formaldehyde as handling object, gaseous phase free radical reaction indirectly, in plasma, active OH or O free radical react with HCHO molecular collision,
HCHO+OH→H
2O+CHO
HCHO+O→OH+CHO
The CHO free radical generating is through the final CO that generates of 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
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is that discharge cell of the present invention is arranged schematic diagram;
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 the circuit connection diagram of discharge cell of the present invention;
Fig. 6 is plasma treatment waste gas flow chart.
Wherein, 1 is insulation board, and 2 is circuit board, and 3 is ground connection circuit board, and 4 is 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 gas access, and 10 is gas vent.
The specific embodiment
The invention provides the device of processing waste gas based on dielectric impedance corona discharge plasma, this device forms system by plasma generation system and gas buffered.Plasma generation system is to utilize the dielectric impedance corona discharge of array (Dielectric Barrier Corona Discharge, referred to as DBCD) produce plasma, the effective area of plasma treatment waste gas can increase according to the actual requirements easily.Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
Referring to Fig. 1～Fig. 3, process a device for waste gas based on dielectric impedance corona discharge plasma, comprise the housing of sealing, in housing, be separated into gas buffer chamber 4 and process chamber 8, on housing, offer respectively the entrance 9 being connected with gas buffer chamber 4, the outlet 10 being connected with process chamber 8;
Its core of this device is discharge cell, and 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 circuit board 2, also can arrange by other shape.
As shown in Figure 3, 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 parts are strictly close to, and forms sandwich structure.
Concrete, high-field electrode 5 is the preferred 6mm of diameter 5～10mm(), the stainless steel bar of long 150mm, one end is with the long screw thread of 10mm, be used for being integrated into circuit board 2 (specifically adopting the corrosion resistant plate that 2～5mm is thick), also can play and fix and guarantee the strict parallel effect of discharge cell, other end polytetrafluoroethylene (PTFE) insulation-encapsulated; The block media 7 of high-field electrode is the PTFE tube that 1mm is thick, and inside and outside footpath is respectively 6mm and 8mm, and long is 150mm; Ground connection screen cloth electrode 6(selects stainless steel ground connection screen cloth) be 20～25 orders (preferably 20 orders), the diameter of stainless steel wire is the preferred 0.5mm of 0.3～0.5mm(), screen cloth is close to and is wrapped in block media outer surface, and the length of winding is 130mm.The high-field electrode of all discharge cells is integrated on circuit board 2 by the end of thread, and ground connection screen cloth electrode is integrated on ground connection circuit board 3 and (specifically adopts the corrosion resistant plate that 2～5mm is thick).
Concrete, as shown in Figure 5, the power supply in figure is the high-voltage ac power (HVAC) for generation of low temperature plasma to the circuit connection diagram of discharge cell.Between discharge cell the two poles of the earth, be also provided with 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 record and preserve with oscillograph, also: discharge voltage is obtained by high-voltage probe; Discharge current records by the noninductive resistance of connecting with ground connection screen cloth; Discharge power obtains as figure by be combined Li Sa with the storehouse volt of ground connection screen cloth series capacitance, and oscillograph is used for wave recording obtain related data.All discharge cell array parallel connections.
According to the needs of processing waste gas, HVAC provides sinusoidal wave applied voltage, and it is that 4.5kV-6.5k V can realize electric discharge that each discharge cell is executed voltage magnitude outside, and noiseless, discharges uniform and stable.According to the actual requirements, can increase successively the number of discharge cell, electric discharge still can easily realize, and uniform and stable noiseless.And no matter be single discharge cell or whole discharge arrays, discharge power is less, this can save electric energy, reduces costs.
Provide a specific embodiment below:
Process the device of waste gas based on dielectric impedance corona discharge plasma, housing adopts the lucite cavity of sealing, be placed in by discharge portion in the lucite cavity of a sealing, then cavity is divided into gas buffer chamber and process chamber two parts: 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 establish PTFE insulation board (preventing creeping discharge) in the both sides up and down of circuit board, and be connected with gas access (with valve) and gas vent respectively; On ground connection circuit board, open the aperture that internal diameter as much as possible is 1.5mm simultaneously, in order to gas from gas buffer chamber even dispersion enter process chamber.
Then prepare the discharge cell of sandwich structure, in discharge cell, especially the selection of block media, ground connection screen cloth electrode is relevant to discharge performance, can in such scheme, select according to actual needs suitable combination; The high-field electrode of all discharge cells and ground connection screen cloth electrode are integrated in respectively on circuit board and ground connection circuit board.
Turn on the electricity according to the circuit theory diagrams of discharge cell again, flow chart shown in Figure 6, after circuit connects, open air inlet valve, when waste gas passes into from gas access, in gas buffer chamber, cushion, the aperture that is 1.5mm via diameters a large amount of on ground connection circuit board 3 makes waste gas enter uniformly in process chamber from gas buffer chamber, discharge cell produces plasma through dielectric impedance corona discharge, abundant active particle and the physical-chemical reaction of processed gas generation series of complex in plasma, end product mostly is innoxious gas componant.The concentration of gas after exhaust outlet Check processing regulates strength of discharge simultaneously, improves treatment effeciency.
Claims (8)
1. process the device of waste gas based on dielectric impedance corona discharge plasma for one kind, it is characterized in that, comprise the housing of sealing, in housing, be separated into gas buffer chamber (4) and process chamber (8), on housing, offer respectively the gas access (9) being connected with gas buffer chamber (4), the gas vent (10) being connected with process chamber (8);
Gas buffer chamber (4) is made up of housing bottom and ground connection circuit board (3), and ground connection circuit board offers multiple gas via-holes on (3);
Process chamber (8) is made up of with the circuit board (2) being connected with high-voltage ac power ground connection circuit board (3), and the both sides up and down of the circuit board (2) being connected with high-voltage ac power are provided with insulation board (1); The circuit board (2) being connected with high-voltage ac power 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, three fits tightly, the upper end of high-field electrode (5) is fixedly connected with the circuit board (2) being connected with high-voltage ac power, lower end insulation-encapsulated, ground connection screen cloth electrode (6) is connected with ground connection circuit board (3);
High-field electrode (5) is the stainless steel bar of diameter 5～10mm; Described block media (7) is the polyfluortetraethylene pipe of wall thickness 1～1.5mm; Ground connection screen cloth electrode (6) is 20～25 object stainless steel mesh, is close to and is wrapped in block media outer surface, and the diameter of its stainless steel wire is 0.3～0.5mm.
2. the device of processing waste gas based on dielectric impedance corona discharge plasma as claimed in claim 1, it is characterized in that, described high-field electrode (5) is fixedly connected with by screw thread with the circuit board (2) being connected with high-voltage ac power, between discharge cell, is parallel to each other.
3. the device of processing waste gas based on dielectric impedance corona discharge plasma as claimed in claim 1, is characterized in that, the voltage magnitude between described high-field electrode (5) and ground connection screen cloth electrode (6) is 4.5～6.5kV.
4. the device of processing waste gas based on dielectric impedance corona discharge plasma as claimed in claim 3, it is characterized in that, between described discharge cell the two poles of the earth, be also provided with the high-voltage probe that measuring voltage is used, measure the noninductive resistance of discharge current, and the waveform of voltage, electric current and numerical value record and preserve with oscillograph.
5. the device of processing waste gas based on dielectric impedance corona discharge plasma as claimed in claim 1, is characterized in that, described insulation board (1) is the polyfluortetraethylene plate that 2～5mm is thick, and the lower end of high-field electrode (5) encapsulates with polyfluortetraethylene plate.
6. the device of processing waste gas based on dielectric impedance corona discharge plasma as claimed in claim 1, it is characterized in that, the described circuit board being connected with high-voltage ac power (2) is the corrosion resistant plate that 2～5mm is thick, and ground connection circuit board (3) is the corrosion resistant plate that 2～5mm is thick.
7. the device of processing waste gas based on dielectric impedance corona discharge plasma as claimed in claim 1, is characterized in that, described housing is lucite cavity.
8. the device of processing waste gas based on dielectric impedance corona discharge plasma as claimed in claim 1, is characterized in that, the quantity of described discharge cell is 1～40.
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| CN201210312355.5A CN102814109B (en) | 2012-08-29 | 2012-08-29 | Device for waste gas treatment based on dielectric barrier corona discharge plasmas |
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| CN102814109B true CN102814109B (en) | 2014-07-02 |
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