CN102958264B - Plasma generation device and method based on back corona creeping-surface breakdown of catalyst as well as application thereof - Google Patents
Plasma generation device and method based on back corona creeping-surface breakdown of catalyst as well as application thereof Download PDFInfo
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Abstract
The invention discloses a plasma generation device based on back corona creeping-surface breakdown of a catalyst. The plasma generation device comprises a plasma generator and a high-voltage power supply, wherein high-low-voltage electrode pairs consisting of corona electrodes and porous electrodes are arranged in the plasma generator; a high specific resistance catalyst layer is arranged between the high-low-voltage electrode pairs; and a high-voltage power supply is connected with the high-low-voltage electrode pairs. The invention further discloses a plasma generation method. According to the plasma generation method, basic conditions of a charge accumulated on the catalyst are provided by adopting a high specific resistance catalyst which has low possibility of releasing the charge; the charge generated by corona discharge forms back corona creeping-surface breakdown on the high specific resistance catalyst layer and generates a plasma on the creeping surface of the catalyst, so that the plasma is tightly combined with the catalyst.
Description
Technical field
The invention belongs to plasma-generating technologies field, be specifically related to a kind of plasma producing apparatus based on catalyst inverse corona surface breakdown and method.
Background technology
Plasma to ionize completely or partial ionization, charge number are bordering on equal positive negative charged particles and the material aggregation state of neutral particle.Plasma can produce active component, is difficult to physical change and the chemical reaction of realization in causing conventional chemical to react.Plasma and catalyst combine and can produce synergy, promote the carrying out of catalytic reaction.
Low temperature plasma production method has a variety of, as highfield, laser, microwave, high-energy particle bombardment, heating etc.Corona discharge and dielectric barrier discharge are the most frequently used low temperature plasma production methods.The subject matter of corona discharge is that the energy of the method injecting reactor is lower, and the plasma of generation is very faint, and very uneven, and its highfield, ionization and luminescence exist only in ate electrode; And the subject matter of dielectric barrier discharge to be efficiency low.In electric precipitation field, in electric cleaner running, there will be a kind of back corona phenomenon reducing electric precipitation effect.The mechanism of production of this phenomenon is: electric cleaner is charged to the dust in air-flow, and charged dust is collected into pole plate under electric field action; When the ratio resistance of dust is higher, the electric charge on dust is difficult to be discharged on pole plate, causes charge accumulation, when between dust layer and dust collecting pole plate, field intensity reaches about 10kV/cm, dust layer local is breakdown, and point-like electric discharge occurs, produce corona light by gas discharge, occur back corona phenomenon.From the mechanism of production of inverse corona, inverse corona can produce plasma.When inverse corona occurs, corona current increases rapidly, and discharge power is increased, and thus, inverse corona can be used for producing high-density plasma.If produce inverse corona on a catalyst, plasma and catalyst can be made to combine closely, strengthen the synergy of plasma and catalyst.
At present, the purified treatment of the organic exhaust gas of low concentration, Wind Volume, conventional processing technique as absorption, absorb, the technology such as thermocatalytic and burning exists that treatment effeciency is low, energy consumption is high and the problem such as operating cost is high to some extent.Low Temperature Plasma Treating organic exhaust gas efficiency is high, cost is low, is considered to the very promising purification treatment technology of one.Plasma-catalytic technology is used for organic waste-gas purification process and has more research, and its plasma occurring mode mainly adopts dielectric barrier discharge, corona discharge and pulsed discharge, and reactor is divided into one-part form and two-part by structure.The feature of one-part form is that catalyst is placed in plasma slab, and the combination of plasma and catalyst is better, but there is byproduct emission problem.The feature of two-part is after catalyst is placed in plasma slab, only has long-life species to arrive catalytic reaction zone, and the aerosol that leading portion produces can be deposited on catalyst surface, covers active sites, reduces exhaust purification efficiency.The plasma-catalytic technology of open report, mainly based on first producing plasma, remakes for this pattern of catalyst at present.Because the active particle life-span of plasma generation is extremely short, most active particle is just withered away before arrival catalyst surface, and the interaction of plasma and catalyst is more weak.Meanwhile, in plasma slab, the generation of active particle and extinction need consumed energy, this reduces the energy efficiency of reactor.
Summary of the invention
For the above-mentioned technological deficiency existing for prior art, the invention provides a kind of plasma producing apparatus based on catalyst inverse corona surface breakdown and method, directly can produce a large amount of plasma on a catalyst, for both synergies provide favourable condition.
Based on a plasma producing apparatus for catalyst inverse corona surface breakdown, comprise plasma generator and high voltage source; Be provided with the high-low pressure electrode pair be made up of corona electrode and porous electrode in described plasma generator, be provided with high specific resistance catalyst layer between described high-low pressure electrode pair, described high voltage source is connected with high-low pressure electrode pair.
Described high specific resistance catalyst layer adopts ratio resistance to be greater than 1 × 10
7the solid catalyst of Ω cm, as aluminium oxide etc.; This type of catalyst principal character is that the valence electron of material is not easy free migration, is also not easy conduction under high voltage electric field.
Described corona electrode is point electrode or line electrode, if form is the electrode of point, pin, line or net.
The supply power mode of described high voltage source adopts direct current supply, Alternating Current Power Supply, pulse power supply, DC stacked Alternating Current Power Supply, DC pulse superposition to power or exchange superimposed pulse and power.
High voltage source is connected with high-low pressure electrode pair, and its connected mode can adjust according to actual needs, both can be connected with corona electrode, also can be connected with porous electrode, also can be connected with porous electrode with corona electrode simultaneously.High voltage source is powered, and both can produce corona discharge at corona electrode place, and can apply high voltage electric field to corona discharging area and catalyst layer again, the electric charge ordering about corona discharge generation is charged to high specific resistance catalyst.
Preferably, between described corona electrode and high specific resistance catalyst layer, be provided with auxiliary electrode, Electric Field Distribution can be made more even, suppress corona discharge to develop to sparkover; Described auxiliary electrode is connected with accessory power supply, and inverse corona can be provided to trigger electric field, promoting catalyst inverse corona surface breakdown.Accessory power supply is connected with auxiliary electrode, and the high voltage source be connected with on high-low pressure electrode pair works to high specific resistance catalyst layer jointly, and inverse corona is occurred; When accessory power supply employing interchange or the pulse power, mainly work to trigger inverse corona and occur; When the field intensity that the high voltage source that high-low pressure electrode pair applies produces enough makes catalyst inverse corona surface breakdown occur, accessory power supply can be disconnected; Now, auxiliary electrode, as suspension electrode, plays a part to redistribute electric field.
Preferably, the catalyst in described high specific resistance catalyst layer is cellular or pumiceous texture; The catalyst of this class formation can provide more duct and surface area, thus provides more electric charge attaching surface, makes catalyst more charged.
Preferably, described auxiliary electrode adopts the electrode of loose structure; There is larger machining area, make Electric Field Distribution more even, partial discharge point is also provided simultaneously, facilitation is played to corona discharge and catalyst corona.
Based on a plasma method for generation for catalyst inverse corona surface breakdown, as follows:
Build the high-low pressure electrode pair be made up of corona electrode and porous electrode, and high specific resistance catalyst layer is set between high-low pressure electrode pair;
By high voltage source, high-low pressure electrode pair is powered, corona electrode produces corona discharge; High voltage electric field is applied to corona discharging area and high specific resistance catalyst layer, orders about electric charge that corona discharge produces charged and in catalyst layer accumulation, the electric charge of accumulation produces additional electric field on catalyst layer to described catalyst layer; Described additional electric field superposes with high voltage electric field and makes the field intensity of catalyst layer meet or exceed the disruptive field intensity of catalyst along face gas, thus causes catalyst inverse corona surface breakdown, makes catalyst along face gas discharge, and then produces plasma.
Apply an organic waste-gas purification processing method for above-mentioned plasma producing apparatus, as follows:
Powered by high voltage source and produce corona discharge on corona electrode, gas near corona electrode is ionized, thus produces a large amount of electric charge;
High voltage electric field is applied to corona discharging area and high specific resistance catalyst layer, orders about electric charge charged and in catalyst layer accumulation, the electric charge of accumulation produces additional electric field on catalyst layer to described catalyst layer; Additional electric field superposes with high voltage electric field and makes the field intensity of catalyst layer meet or exceed the disruptive field intensity of catalyst along face gas, thus causes catalyst inverse corona surface breakdown, makes catalyst along face gas discharge, and then produces plasma;
Organic exhaust gas is passed into plasma generator, makes waste gas first by corona discharging area, the plasma utilizing corona discharge to produce carries out preliminary treatment to organic exhaust gas; Make pretreated organic exhaust gas by high specific resistance catalyst layer, under the plasma body cooperative effect that organic exhaust gas produces at catalyst and inverse corona, catalyzed decomposition is to realize purified treatment, is finally discharged from plasma generator by the gas after purified treatment.
Present invention employs the high specific resistance catalyst not easily discharging electric charge, provide the primary condition that electric charge is accumulated on a catalyst; Make use of the electric charge that corona discharge produces, at high specific resistance catalyst layer generation inverse corona surface breakdown, plasma is produced along face at catalyst, this not only makes catalyst external surface create plasma, simultaneously creating plasma through the hole of catalyst layer, duct and corresponding catalyst along on face, plasma and catalyst are combined closely.Produce plasma by corona discharge and high specific resistance catalyst inverse corona surface breakdown in the present invention, be the plasma-catalytic system of one-part form and two-period form of being coupled simultaneously.Be applied to purification organic waste gas treatment, one section of preliminary treatment and two sections of intensive treatment can be combined effectively; Corona discharge produces a large amount of active specy, preliminary treatment is carried out to organic exhaust gas, make an organic gas part be broken down into inorganic matter or be decomposed into small organic molecule, part polymerization in high activity reaction atmosphere forms aerosol, also produces the strong oxidizing property species such as ozone simultaneously; The high specific resistance catalyst of corona discharge and back segment forms two-part plasma-catalytic system in general sense, can to organic waste-gas purification process, and ozone decomposes generation active oxygen on a catalyst, can efficient-decomposition organic substance; High specific resistance catalyst inverse corona surface breakdown forms plasma-catalytic reaction zone, directly produce plasma on a catalyst, this is one-part form plasma-catalytic system, and be the plasma-catalytic system that catalyst and plasma combine closely, be conducive to the purified treatment effect improving organic exhaust gas.
Utilize process organic exhaust gas of the present invention, efficiently solve aerocolloidal problem in plasma-catalytic degradation organic waste gas process, the aerosol that Corona discharge Treatment process produces is electrically charged, make aerosol with air-flow by being more easily captured on a catalyst during catalyst layer, because inverse corona is that original position produces on a catalyst, aerosol can be made to decompose under the synergy of plasma and catalyst.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first execution mode of generating means of the present invention.
Fig. 2 is the structural representation of generating means the second execution mode of the present invention.
Fig. 3 is the structural representation of the third execution mode of generating means of the present invention.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the drawings and the specific embodiments, technical scheme of the present invention is described in detail.
Embodiment 1
As shown in Figure 1, based on a plasma producing apparatus for catalyst inverse corona surface breakdown, comprise plasma generator 7, high voltage source 5, the high-low pressure electrode pair, auxiliary electrode 2, accessory power supply 6 and the high specific resistance catalyst layer 3 that are made up of corona electrode 1 and porous electrode 4; Wherein:
High-low pressure electrode pair is located in plasma generator 7, and two electrode spacings are 3cm; High specific resistance catalyst layer 3 is located between high-low pressure electrode pair; Auxiliary electrode 2 is located between corona electrode 1 and high specific resistance catalyst layer 3, and is 2cm with the spacing of corona electrode 1; Accessory power supply 6 one end is connected with auxiliary electrode 2, other end ground connection; High voltage source 5 one end is connected with corona electrode 1, other end ground connection; Porous electrode 4 ground connection.
Plasma generator 7 internal diameter is 10cm;
Corona electrode 1 adopts stainless steel wire electrode, and linear diameter is 1mm, length is 8cm;
Porous electrode 4 adopts stainless (steel) wire electrode;
High specific resistance catalyst layer 3 adopts honeycomb-shaped oxidizing Al catalysts, and presses close to mutually with porous electrode 4, and its external diameter, thickness and aperture are respectively 10cm, 10mm and 1mm;
Auxiliary electrode 2 adopts the foaming nickel screen of load manganese dioxide, and its external diameter is 10cm, thickness is 2mm;
High voltage source 5 adopts DC power supply, and accessory power supply 6 adopts the pulse power.
Honeycomb-shaped oxidizing Al catalysts adopts boehmite (AlOOH.nH
2o, 0 < n < 1) as alumina precursor, cellular oxidative alumina supporter is prepared in extrusion modling, then adopt cladding process by manganese dioxide-catalyst load on carrier, obtained honeycomb-shaped oxidizing Al catalysts.The ratio resistance value recording aluminium oxide catalyst is 1 × 10
8Ω cm.
The foaming nickel screen of load manganese dioxide adopts infusion process preparation, and the electrode made is the sintered body of metal and oxide, has good electric conductivity, can be used as auxiliary electrode.
The method that present embodiment plasma occurs is: connect DC power supply, output voltage is-35kV, and corona discharge on stainless steel wire electrode, occurs corona around stainless steel wire; Auxiliary electrode, by the electric field redistribution between high-low pressure electrode, makes the field intensity between auxiliary electrode and stainless (steel) wire electrode become even, makes inverse corona catalyst layer occurring local, the electric discharge phenomena of catalyst duct visual flicker; Make pulse power supply, output voltage is-10kV, and frequency is 10Hz, additional electric field is applied to catalyst layer, makes catalyst layer field intensity exceed gas breakdown field intensity, after every subpulse exports, all occur large area inverse corona in catalyst layer surface, duct, gas discharge produces plasma.
Oscilloscope is adopted to test real-time discharging current, the average current of ammeter electric discharge.When catalyst inverse corona occurs, oscilloscope can detect very large pulse current.When not adopting high specific resistance catalyst, only there is corona at corona electrode place, between auxiliary electrode and stainless (steel) wire electrode, do not produce plasma.Current density during corona discharge catalyst inverse corona surface breakdown is 3 times when not adopting high specific resistance catalyst, and its plasma generation power known is 3 times of the latter, and plasma generation density significantly improves.
The method of application present embodiment purification organic waste gas treatment: simulate organic exhaust gas with styrene, under normal temperature and pressure, concentration of styrene is 100ppm, flow 2L/min; Connect DC power supply and the pulse power, direct current supply voltage-35kV, pulse power supply-10kV (10Hz), produce corona discharge at stainless steel wire electrode place, produce inverse corona at catalyst layer; Organic exhaust gas is passed into plasma generator, and make it be introduced into corona discharging area, styrene is pretreated, and part can be broken down into H
2o and CO
2, part can be oxidized to the not exclusively catabolite such as formaldehyde, formic acid, benzoic acid and benzaldehyde, and produces a large amount of aerosol, also produces ozone simultaneously; After pretreated gas enters catalyst layer, aerosol is trapped on catalyst layer, under the synergy of plasma catalyst, styrene and the not exclusively catalyzed decomposition of catabolite, ozone is catalyzed dose of decomposition also, the active oxygen that catalytic decomposition of ozone produces, decomposable asymmetric choice net organic substance; After tested, through the process of corona discharge and catalyst inverse corona, styrene removal efficiency reaches 97%.
Embodiment 2
As shown in Figure 2, based on a plasma producing apparatus for catalyst inverse corona surface breakdown, comprise plasma generator 8, high voltage source, the high-low pressure electrode pair, auxiliary electrode 2 and the high specific resistance catalyst layer 3 that are made up of corona electrode 1 and porous electrode 4; Wherein:
High-low pressure electrode pair is located in plasma generator 8, and two electrode spacings are 3cm; High specific resistance catalyst layer 3 is located between high-low pressure electrode pair; Auxiliary electrode 2 is located between corona electrode 1 and high specific resistance catalyst layer 3, and is 16mm with the spacing of corona electrode 1; High voltage source is connected with corona electrode 1, porous electrode 4 ground connection.
The coupling circuit 6 that high voltage source adopts DC power supply 5 to pass through to be made up of the electronic component such as diode and electric capacity superposes with the pulse power 7 and forms, and after superposition, the output of coupling circuit 6 is connected with corona electrode 1;
Plasma generator 8 internal diameter is 4cm;
Corona electrode 1 adopts stainless (steel) wire electrode, and diameter is 4cm, thickness 1 is mm;
Porous electrode 4 adopts discoid stainless steel porous plate electrode, and external diameter is 40mm, bore dia is 2mm;
High specific resistance catalyst layer 3 adopts silicoaluminophosphate molecular sieve catalyst (particle diameter 3mm), and covers on porous electrode 4, and thickness is 10mm, and ratio resistance value is 6 × 10
8Ω cm;
Auxiliary electrode 2 adopts the foamed alumina electrode of loaded Ag-MnOx catalyst, and external diameter is 4cm, thickness is 2mm.
The foamed alumina electrode of loaded Ag-MnOx catalyst obtains Powdered Ag-MnOx catalyst for adopting coprecipitation, is mixed by Ag-MnOx catalyst, then adopt cladding process by Ag-MnOx catalyst cupport foamed alumina with Alumina gel; Due to foamed alumina catalyst containing metal silver, there is good electric conductivity, can be used as auxiliary electrode.
The method that present embodiment plasma occurs is: connect DC power supply and the pulse power, direct current output-40kV, and pulse exports-20kV, frequency 1000Hz, corona discharge on stainless (steel) wire electrode, and corona appears in stainless (steel) wire bottom; Auxiliary electrode is as suspension electrode, by the electric field redistribution between high-low pressure electrode, the field intensity between auxiliary electrode and stainless (steel) wire electrode is made to become even, catalyst layer field intensity is made to exceed gas breakdown field intensity after the pulse power output of superposition, all occur large area inverse corona between catalyst surface, space, gas discharge produces plasma.
The method of application present embodiment purification organic waste gas treatment: simulate organic exhaust gas with styrene, under normal temperature and pressure, concentration of styrene is 200ppm, flow 500mL/min; Connect DC power supply and the pulse power, direct current output-40kV, pulse exports-20kV, frequency 1000Hz, produces corona discharge at stainless (steel) wire electrode place, produces inverse corona at catalyst layer; Organic exhaust gas is passed into plasma generator, and make it be introduced into corona discharging area, styrene is pretreated, and part can be broken down into H
2o and CO
2, part can be oxidized to the not exclusively catabolite such as formaldehyde, formic acid, benzoic acid and benzaldehyde, and produces a large amount of aerosol, also produces ozone simultaneously; After pretreated gas enters catalyst layer, aerosol is trapped on catalyst layer, under the synergy of plasma catalyst, styrene and the not exclusively catalyzed decomposition of catabolite, ozone is catalyzed dose of decomposition also, the active oxygen that catalytic decomposition of ozone produces, decomposable asymmetric choice net organic substance; After tested, through the process of corona discharge and catalyst inverse corona, styrene removal efficiency reaches 99%.
Embodiment 3
As shown in Figure 3, based on a plasma producing apparatus for catalyst inverse corona surface breakdown, comprise plasma generator 7, high voltage source 5, the high-low pressure electrode pair, auxiliary electrode 2, accessory power supply 6 and the high specific resistance catalyst layer 3 that are made up of corona electrode 1 and porous electrode 4; Wherein:
High-low pressure electrode pair is located in plasma generator 7, and two electrode spacings are 3cm; High specific resistance catalyst layer 3 is located between high-low pressure electrode pair; Auxiliary electrode 2 is located between corona electrode 1 and high specific resistance catalyst layer 3, and is 15mm with the spacing of corona electrode 1; High voltage source 5 one end is connected with corona electrode 1, and the other end is connected with porous electrode 4; Accessory power supply 6 one end is connected with auxiliary electrode 2, other end ground connection.
High voltage source 5 adopts AC power, and accessory power supply 6 adopts the pulse power;
Plasma generator 7 adopts square long cylinder, and length, width and height size is respectively 30cm, 10cm and 10cm;
Corona electrode 1 adopts stainless pin electrode, and diameter is 0.5mm; Many stainless pins are evenly distributed on porous plate (diameter and thickness are respectively 8cm and 5mm), and tip is in same plane;
Porous electrode 4 adopts stainless (steel) wire electrode, and external diameter is 10cm, thickness is 1mm;
High specific resistance catalyst layer 3 adopts cuboid honeycomb-like cordierite catalyst, and bed-plate dimension is long 10cm, wide 10cm, and thickness is 5mm, and aperture is 1mm;
Auxiliary electrode 2 adopts 5 stainless steel wires vertically arranged in parallel as electrode, and diameter is 4mm, length is 8cm.
Honeycomb-like cordierite catalyst obtains Powdered Co-MnOx catalyst for adopting coprecipitation, Co-MnOx catalyst is mixed with Alumina gel, wherein (Co+Mn): Al mass ratio is 1: 4, adopt cladding process again by mixed catalyst load on honeycomb-typed steel, the ratio resistance value recording catalyst is 3.2 × 10
10Ω cm.
The method that present embodiment plasma occurs is: connect AC power, and direct current exports 30kV, and corona discharge on stainless pin electrode, occurs corona around stainless pin; Auxiliary electrode, by the electric field redistribution between high-low pressure electrode, makes the field intensity between auxiliary electrode and stainless (steel) wire electrode become even, makes inverse corona catalyst layer occurring local, the electric discharge phenomena of catalyst duct visual flicker; Make pulse power supply, output voltage is-10kV, and frequency is 10Hz, additional high voltage electric field is applied to catalyst layer, makes catalyst layer field intensity exceed gas breakdown field intensity, after every subpulse exports, all occur large area inverse corona in catalyst surface, duct, gas discharge produces plasma.
The method of application present embodiment purification organic waste gas treatment: with toluene, styrene and formaldehyde mist simulation organic exhaust gas, under normal temperature and pressure, the concentration of toluene, styrene and formaldehyde is respectively 50ppm, 150ppm and 200ppm, flow 2L/min; Connect AC power and the pulse power, alternating supply voltage 30kV, pulse power supply-10kV (10Hz), produce corona discharge at stainless pin electrode place, produce inverse corona at catalyst layer; Organic exhaust gas is passed into plasma producing apparatus, and make it be introduced into corona discharging area, organic gas is pretreated, and part can be broken down into H
2o and CO
2, part can be oxidized to the not exclusively catabolite such as formaldehyde, formic acid, benzoic acid and benzaldehyde, and produces a large amount of aerosol, also produces ozone simultaneously; After pretreated gas enters catalyst layer, aerosol is trapped on catalyst layer, under the synergy of plasma catalyst, organic gas and the not exclusively catalyzed decomposition of catabolite, ozone is catalyzed dose of decomposition also, the active oxygen that catalytic decomposition of ozone produces, decomposable asymmetric choice net organic substance; After tested, through the process of corona discharge and catalyst inverse corona, the removal efficiency of toluene, styrene and formaldehyde is respectively 93%, 97% and 98%.
Claims (3)
1., based on a plasma producing apparatus for catalyst inverse corona surface breakdown, comprise plasma generator and high voltage source; It is characterized in that: be provided with the high-low pressure electrode pair be made up of corona electrode and porous electrode in described plasma generator, be provided with high specific resistance catalyst layer between described high-low pressure electrode pair, described high voltage source is connected with high-low pressure electrode pair;
Be provided with auxiliary electrode between described corona electrode and high specific resistance catalyst layer, described auxiliary electrode is connected with accessory power supply;
Catalyst in described high specific resistance catalyst layer is cellular or pumiceous texture, and described auxiliary electrode adopts the electrode of loose structure.
2. based on a plasma method for generation for catalyst inverse corona surface breakdown, as follows:
Build the high-low pressure electrode pair be made up of corona electrode and porous electrode, and high specific resistance catalyst layer is set between high-low pressure electrode pair;
By high voltage source, high-low pressure electrode pair is powered, corona electrode produces corona discharge; High voltage electric field is applied to corona discharging area and high specific resistance catalyst layer, orders about electric charge that corona discharge produces charged and in catalyst layer accumulation, the electric charge of accumulation produces additional electric field on catalyst layer to described catalyst layer; Described additional electric field superposes with high voltage electric field and makes the field intensity of catalyst layer meet or exceed the disruptive field intensity of catalyst along face gas, thus causes catalyst inverse corona surface breakdown, makes catalyst along face gas discharge, and then produces plasma.
3. apply an organic waste-gas purification processing method for plasma producing apparatus as claimed in claim 1, as follows:
Powered by high voltage source and produce corona discharge on corona electrode, gas near corona electrode is ionized, thus produces a large amount of electric charge;
High voltage electric field is applied to corona discharging area and high specific resistance catalyst layer, orders about electric charge charged and in catalyst layer accumulation, the electric charge of accumulation produces additional electric field on catalyst layer to described catalyst layer; Additional electric field superposes with high voltage electric field and makes the field intensity of catalyst layer meet or exceed the disruptive field intensity of catalyst along face gas, thus causes catalyst inverse corona surface breakdown, makes catalyst along face gas discharge, and then produces plasma;
Organic exhaust gas is passed into plasma generator, makes waste gas first by corona discharging area, the plasma utilizing corona discharge to produce carries out preliminary treatment to organic exhaust gas; Make pretreated organic exhaust gas by high specific resistance catalyst layer, under the plasma body cooperative effect that organic exhaust gas produces at catalyst and inverse corona, catalyzed decomposition is to realize purified treatment, is finally discharged from plasma generator by the gas after purified treatment.
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