CN103301728B - Device for treating malodorous gas based on capacitive coupling partition discharge plasma - Google Patents
Device for treating malodorous gas based on capacitive coupling partition discharge plasma Download PDFInfo
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- CN103301728B CN103301728B CN201310240768.1A CN201310240768A CN103301728B CN 103301728 B CN103301728 B CN 103301728B CN 201310240768 A CN201310240768 A CN 201310240768A CN 103301728 B CN103301728 B CN 103301728B
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Abstract
The invention discloses a device for treating malodorous gas based on capacitive coupling partition discharge plasma. The device comprises a shell, and a high-frequency power supply and a matching network which are arranged outside the shell, wherein the shell is internally and sequentially provided with a flat-plate electrode, a needle electrode fixing plate and a grid plate at intervals from bottom to top; one ends of a plurality of needle electrodes on the needle electrode fixing plate correspond to the flat-plate electrode, and the other ends of the needle electrodes are respectively connected with a low-voltage electrode of the high-frequency power supply in parallel by a capacitor; the flat-plate electrode is connected with a high-voltage electrode of the high-frequency power supply by an adjustable capacitor outside the shell; an air guide hole is formed in the middle of the flat-plate electrode; the shell above the grid plate is internally filled with activated carbon to form an activated carbon filling area. The device for treating malodorous gas has the advantages of being high in treatment efficiency, short in reaction time, free from secondary pollution, etc.
Description
Technical field
The invention belongs to industrial foul gas pollutant control field, is specifically a kind of device based on Capacitance Coupled subregion discharge plasma process foul gas.
Background technology
Odorant pollutant refers to that all stimulate olfactory organ to cause the gaseous matter of people's unhappiness and damage living environment, and it is one of typical public hazards.Odorant distribution is wide, and coverage is large, and the stench that some pollution sources occur can involve a few km to tens km of circumference.The source of stench is a lot, and it mainly comes from: the stench etc. that industrial production waste gas stench, farming and animal husbandry stench, urban public utilities produce.Odorant can fall into 5 types according to its composition: (1) sulfur-containing compound is (as H
2s, thio-alcohol and thioether class); (2) nitrogen-containing compound (as amine, acid amides and indoles); (3) halogen and derivative (as chlorine and halogenated hydrocarbons); (4) hydro carbons (as alkane, alkene, alkynes and aromatic hydrocarbon); (5) oxygen containing organic matter (as alcohol, phenol, aldehyde, ketone and organic acid etc.).
The method of improvement foul gas traditional at present has Physical (masking method and dilution diffusion method), combustion method (flame combustion method and Production by Catalytic Combustion Process), absorption method, oxidizing process (Ozonation, catalytic oxidation and hydrogen peroxide method etc.), washing method (also claiming absorption process).But these these methods also exist respectively, and purification is thorough, Purge gas kind is single, technique controlling difficulty is large, energy consumption is high and may cause the shortcomings such as secondary pollution.The method of improvement foul gas emerging at present mainly contains bioanalysis, photocatalytic oxidation and plasma method.Wherein bioanalysis equipment is simple, energy consumption is low, it is little to produce the possibility of secondary pollution, it is the main stream approach of current domestic and international smelly pollution control, but the method needs to cultivate can by the bacterial classification of foul smell composition oxidation Decomposition, and the impact that the deodorizing effect of bacterial classification is subject to the factors such as external environment is larger.The catalyst that photocatalytic oxidation needs is expensive, and limits by quantum efficiency, is difficult to the organic exhaust gas processing large discharge, high concentration, and thus application industrially needs to be developed further.
Since entering the nineties in 20th century, plasma purification dusty gas is utilized to become the focus of many scholar's research, under laboratory conditions, they utilize corona discharge pulse, creeping discharge, glow discharge and dielectric barrier discharge to purify single pernicious gas (non-foul gas) respectively, all reach good treatment effect.But, utilize the energy utilization efficiency of the foul gas of low temperature plasma when carrying out foul gas and administering lower.At present, for low temperature plasma generation method mainly corona discharge and the dielectric barrier discharge that dusty gas is administered, but the plasma space that corona discharge generates is narrow and small, and active particle concentration is low, and uneven, the plasma of stable and uniform cannot be produced in practical application; Dielectric barrier discharge feature has dielectric between electrode, restriction electric discharge development, form many micro discharges, charge accumulated in micro discharge forms strong reversed electric field at dielectric surface, extinguishes electric discharge, the plasma uniformity of generation is improved, but its power is very little, micro discharge peak point current is little, and electrode spacing is narrow, and efficiency is low, hear rate of simultaneously discharging is very large, and temperature is higher easily burns out reaction unit material.Under atmospheric pressure, corona discharge and dielectric barrier discharge all can not produce the plasma of stable and uniform, are not the ideal chose methods that foul gas is administered.
Summary of the invention
For existing plasma treatment odorant pollutant technology above shortcomings, the object of the present invention is to provide a kind of device based on Capacitance Coupled subregion discharge plasma process foul gas, solve the problem of the plasma small scale that traditional plasma under atmospheric pressure produces, uneven, poor stability.
Object of the present invention can be achieved through the following technical solutions:
A kind of device based on Capacitance Coupled subregion discharge plasma process foul gas, this device comprises housing and the high frequency electric source that is arranged on outside housing and matching network, the two ends of described matching network are connected with the two poles of the earth of high frequency electric source respectively, the bottom of described housing and top are respectively equipped with air inlet and gas outlet, described enclosure interior is interval with plate electrode from bottom to top successively, needle electrode fixed head and grate plate, described plate electrode, the shape of needle electrode fixed head and grate plate and the shape of described housing inner diameter match, described needle electrode fixed head is installed with multiple needle electrode, and described plate electrode is corresponding and interval is at regular intervals in one end of multiple needle electrode, the other end is connected in parallel respectively by the low-field electrode of electric capacity and described high frequency electric source, and described electric capacity is sealed in described needle electrode fixed head respectively, the plate face of described needle electrode fixed head is evenly provided with multiple gas port, described plate electrode is connected with the high-field electrode of high frequency electric source by being located at the tunable capacitor outside housing, and the middle part of described plate electrode is provided with gas port, be filled with active carbon in housing more than described grate plate and form active carbon fill area.
Described plate electrode is metallic copper or aluminium electrode.
Described needle electrode is metallic copper or aluminium electrode, and electrode cross-section diameter is 2 ~ 4mm.
Spacing between described needle electrode and plate electrode is 2 ~ 15mm.
Through hole in described grate plate is evenly arranged.This grate plate is made up of the Ins. ulative material with good intensity.
Described active carbon is cylindrical particles shape activated carbon, its diameter of section 2mm, length 3 ~ 5mm.
Capacitance 10 ~ the 50pF of described tunable capacitor.
Housing below described plate electrode is that funnel-form forms funnel shaped gas Lead-In Area.
Utilize the method for above-mentioned device process foul gas, foul gas is by the air inlet of housing bottom, after entering gas Lead-In Area, entered between plate electrode and multiple needle electrode by the gas port be located in the middle part of plate electrode and carry out plasma discharge reaction, then by being opened in gas port on needle electrode fixed head plate face and grate plate enters active carbon fill area, after the further adsorption treatment of active carbon, through the gas outlet on device top, the clean gas after process is derived.
Be connected to the matching network of high frequency electric source two interpolar for mating the capacitance-resistance of high frequency electric source and load electrode circuit.The stability of raising system, obtains stable plasma.Simultaneously matching network regulates power supply to mate with the capacitance-resistance between plate electrode and needle electrode.Plate electrode and needle electrode and the electric capacity be connected thereof are all the loads of power supply.
Matching network of the present invention is known in those skilled in the art, and those skilled in the art can resist according to load impedance and the internal resistance of source according to prior art or design matching network with the size of transmission line wave impedance.
Beneficial effect of the present invention is:
The present invention adopts Capacitance Coupled subregion discharge plasma process foul gas, there is treatment effeciency high, reaction time is short, outside the advantages such as non-secondary pollution, the plasma space also overcoming the electric discharge generation that general plasma process foul gas exists is narrow and small, and active particle concentration is low, and uneven, discharge instability, the low inferior problem of energy utilization efficiency.Capacitance Coupled subregion discharge plasma technique is adopted to improve discharge power, and set up reversed electric field extinguishing electric discharge, improve the uniformity of electric discharge, just can to obtain on a large scale at normal pressure, high density, equally distributed plasma, greatly can improve the generation efficiency of plasma.Capacitance Coupled subregion discharge plasma technique is on the basis of monolateral capacitively coupled discharge, plate electrode and be all connected to coupling capacitance between needle electrode and power supply, be independent of each other between adjacent electrode during electric discharge, realize subregion electric discharge, at controlled discharge energy, improve discharge stability, improve in plasma uniformity, have and preferably show.Coupling capacitance due to the electric discharge of Capacitance Coupled subregion is 500-600 times of Equivalent Capacitance in Dielectric Barrier Discharge, single micro discharge electric quantity transfered is corresponding to be increased substantially, in addition, in the electric discharge of Capacitance Coupled subregion, the access of electric capacity makes discharge energy be effectively controlled, simultaneously because coupling capacitance is to the extinguishing effect of electric discharge, the electric discharge of one place stops other place can continue electric discharge, other region is not affected, achieve subregion electric discharge, realize each pin electrode and can realize stable discharging generation plasma.Access matching network between electrode simultaneously, realize capacitance-resistance Proper Match between the power supply of Capacitance Coupled subregion discharge plasma and discharge reactor.Adopt Capacitance Coupled subregion discharge plasma processing feature foul gas, not only have outside the advantages such as treatment effeciency is high, and the reaction time is short, non-secondary pollution, also greatly improve energy utilization efficiency, save energy consumption.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram based on Capacitance Coupled subregion discharge plasma process foul gas.
In figure: 1 high frequency electric source, 2 matching networks, 3 tunable capacitors, 4 plate electrodes, 5 needle electrodes, 6 electric capacity, 7 grate plates, 8 active carbon fill areas, 9 air inlets, 10 gas ports, 11 gas ports, 12 gas outlets, 13 air inlet area, 14 needle electrode fixed heads, 15-housing;
Fig. 2 is needle electrode fixed head upward view.
Detailed description of the invention
As shown in Figure 1, a kind of device based on Capacitance Coupled subregion discharge plasma process foul gas, this device comprises housing 15 and the high frequency electric source 1 that is arranged on outside housing 15 and matching network 2, the two ends of described matching network 2 are connected with the two poles of the earth of high frequency electric source 1 respectively, the bottom of described housing 15 and top are respectively equipped with air inlet 9 and gas outlet 12, described housing 15 inside is interval with plate electrode 4 from bottom to top successively, needle electrode fixed head 14 and grate plate 7, described plate electrode 4, the shape of needle electrode fixed head 14 and grate plate 7 and the shape of described housing 1 internal diameter match, described needle electrode fixed head 14 is installed with multiple needle electrode 5, and described plate electrode 4 is corresponding and interval is at regular intervals in one end of multiple needle electrode 5, the other end is connected in parallel respectively by the low-field electrode of electric capacity 6 with described high frequency electric source 1, and described electric capacity 6 is sealed in described needle electrode fixed head 14 respectively, the plate face of described needle electrode fixed head 14 is evenly provided with multiple gas port 11, described plate electrode 4 is connected with the high-field electrode of high frequency electric source 1 by the tunable capacitor 3 be located at outside housing 15, and the middle part of described plate electrode 4 is provided with gas port 10, be filled with active carbon in the housing 15 of described grate plate more than 7 and form active carbon fill area 8.
Described plate electrode 4 is metallic copper or aluminium electrode, and the large I being located at the gas port 10 in the middle part of plate electrode 4 is arranged according to the tolerance size of actual treatment.Described needle electrode 5 is metallic copper or aluminium electrode, and electrode cross-section diameter is 2 ~ 4mm.Spacing between described needle electrode 5 and plate electrode 4 is 5 ~ 10mm.
Through hole in described grate plate 7 is evenly arranged.This grate plate 7 is made up of the Ins. ulative material with better intensity, and object is to play the effect supporting active carbon filler and even gas distribution.
Described active carbon is cylindrical particles shape activated carbon, its diameter of section 2mm, length 3 ~ 5mm.
Capacitance 10 ~ the 50pF of described tunable capacitor 3.
Housing 15 below described plate electrode 4 is funnel-form formation funnel shaped gas Lead-In Area 13.
Adopt the method for above-mentioned Capacitance Coupled subregion plasma discharging body device process foul gas: need foul gas to be processed by the air inlet 9 bottom housing 15, after entering gas Lead-In Area 13, entered between plate electrode 4 and multiple needle electrode 5 by the gas port 10 be located in the middle part of plate electrode 4 and carry out plasma discharge reaction, then by being opened in gas port 11 on needle electrode fixed head 14 plate face and grate plate 7 enters active carbon fill area 8, after the further adsorption treatment of active carbon, through the gas outlet 12 on device top, clean gas after process is derived.
Plasma reaction district between plate electrode 4 and multiple needle electrode 5 can produce a large amount of low temperature plasmas in discharge process, namely a large amount of high energy electrons is produced, there is inelastic collision in high energy electron and gas molecule (atom), it is the interior energy of ground state molecule (atom) by Conversion of Energy, excite, dissociation, the series reaction such as ionization, make gas be in the state of activation.When electron energy is lower, the contaminant molecule after the living radical activation of generation is removed after the directed chain chemical reaction of plasma; When the energy of electronics is greater than the Chemical bond energy of foul gas molecule, there is fracture and decompose in molecule, and high energy electron also encourages and produces O, OH, H, O in gas simultaneously
3deng free radical, these free radicals all have very strong oxidisability, finally foul gas can be converted to CO
2, H
2o, SO
x, NO
xdeng innocuous gas.Enter into after active carbon fill area through reacted foul gas, incomplete small part foul gas is not reacted or reacted to the suction-operated aid in treatment further by active carbon, ensures that process reaches ideal effect.
React for making plasma discharge and can generate extensive, high density, equally distributed plasma, improve the generation efficiency of plasma, be coupled in the present invention a tunable capacitor 3 between plate electrode 4 and the high-field electrode of high frequency electric source 1, each needle electrode 5 and the electric capacity 6 that is coupled respectively between low-field electrode, each electric capacity 6 is sealed in described needle electrode fixed head 14 respectively, therefore keep apart between each needle electrode 5, be independent of each other during electric discharge, realize subregion electric discharge, improve the uniformity of electric discharge.Between high frequency electric source and load needle plate electrode circuit, be arranged in parallel matching network, both can improve system effectiveness, again can enhanced discharge stability.During work, tunable capacitor is charged to predetermined value, between plate electrode 4 and needle electrode 5, voltage discharges higher than during gap breakdown voltage, produce discharge current, to the capacitor charging that needle electrode connects, electric charge can not enter earthing pole because electric capacity intercepts, and is accumulated in low-field electrode surface, produces the reversed electric field strengthened gradually, offset discharge electric field, extinguish electric discharge.This process is similar to the micro discharge in dielectric barrier discharge process, but is with its difference, and do not hinder medium between plate electrode 4 and needle electrode 5, thus discharge space is large.Due to the 500-600 doubly left and right that coupling capacitance is Equivalent Capacitance in Dielectric Barrier Discharge, single micro discharge electric quantity transfered is corresponding to be increased substantially.As required, the object of controlled discharge power can be reached by reconciling coupling capacitance.Usually its discharge power can reach more than 100 times of dielectric barrier discharge.The access of tunable capacitor simultaneously makes discharge energy be effectively controlled, and when a part of discharging regions, does not affect other region, achieves subregion electric discharge, changes again the situation that corona discharging area is too concentrated.
Be described further below in conjunction with the method for embodiment to above-mentioned Capacitance Coupled subregion plasma discharging body device processing feature foul gas:
Embodiment 1
As shown in Figure 1, high frequency electric source 1 output voltage 0-15KV, power output 200W, matching network 2 mates for regulating the capacitance-resistance between power supply and telegraph circuit load, stable and controlled discharge; Tunable capacitor is 30pF, and plate electrode 4 is copper metal electrode, and needle electrode 5 is its diameter of section of copper electrode 2mm, and each electric capacity be connected with needle electrode 5 is 20pF, and the spacing between plate electrode 4 and needle electrode 5 is 5mm.Active carbon fill area 8 fills cylindrical particles shape activated carbon, its diameter of section 2mm, length 3 ~ 5mm.Handled foul gas is methyl sulfide CH
3sCH
3, initial concentration is 500mg/m
3, gas treatment flow is 1L/min.
Foul gas methyl sulfide is by device bottom air inlet 9, and successively after plasma discharge oxidation Decomposition and the auxiliary absorption of active carbon, derive through the gas outlet 12 on device top, wherein odor pollutant methyl sulfide is effectively removed, and clearance reaches more than 95%.
Embodiment 2
With embodiment 1, only change the foul gas methyl sulfide of process in embodiment 1 into ammonia, its initial concentration is 200mg/m
3, gas treatment flow is 1L/min, and the Exhaust Gas after process has no irritating odor, and the treatment effeciency of ammonia is more than 96%.
Embodiment 3
With embodiment 1, only change the foul gas methyl sulfide of process in embodiment 1 into formaldehyde gas, initial concentration of formaldehyde is 600mg/m
3, gas treatment flow is 1L/min, and the Exhaust Gas after process has no irritating odor, and the treatment effeciency of formaldehyde is more than 97%.
Above-described embodiment is only be described embodiments of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those skilled in the art make technical scheme of the present invention and improvement, all fall in protection domain that claims of the present invention determines.
Claims (8)
1. the device based on Capacitance Coupled subregion discharge plasma process foul gas, it is characterized in that this device comprises housing (15) and is arranged on housing (15) high frequency electric source outward (1) and matching network (2), the two ends of described matching network (2) are connected with the two poles of the earth of high frequency electric source (1) respectively, the bottom of described housing (15) and top are respectively equipped with air inlet (9) and gas outlet (12), described housing (15) inside is interval with plate electrode (4) from bottom to top successively, needle electrode fixed head (14) and grate plate (7), described plate electrode (4), the shape of needle electrode fixed head (14) and grate plate (7) and the shape of described housing inner diameter match, described needle electrode fixed head (14) is installed with multiple needle electrode (5), and described plate electrode (4) is corresponding and interval is at regular intervals in one end of multiple needle electrode (5), the other end is connected in parallel respectively by the low-field electrode of electric capacity (6) with described high frequency electric source (1), and described electric capacity (6) is sealed in described needle electrode fixed head (14) respectively, the plate face of described needle electrode fixed head (14) is evenly provided with multiple gas port (11), described plate electrode (4) is connected with the high-field electrode of high frequency electric source (1) by being located at housing (15) tunable capacitor outward (3), and the middle part of described plate electrode (4) is provided with gas port (10), be filled with active carbon in housing (15) more than described grate plate (7) and form active carbon fill area (8).
2. device according to claim 1, is characterized in that described plate electrode (4) is for metallic copper or aluminium electrode.
3. device according to claim 1, it is characterized in that described needle electrode (5) is for metallic copper or aluminium electrode, electrode cross-section diameter is 2 ~ 4mm.
4. device according to claim 1, is characterized in that the spacing between described needle electrode (5) and plate electrode (4) is 2 ~ 15mm.
5. device according to claim 1, is characterized in that the through hole in described grate plate (7) is evenly arranged.
6. device according to claim 1, is characterized in that described active carbon is cylindrical particles shape activated carbon, its diameter of section 2mm, length 3 ~ 5mm.
7. device according to claim 1, is characterized in that the capacitance 10 ~ 50pF of described tunable capacitor (3).
8. device according to claim 1, is characterized in that the housing (15) of described plate electrode (4) below is for funnel-form formation funnel shaped gas Lead-In Area (13).
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| CN201310240768.1A CN103301728B (en) | 2013-06-17 | 2013-06-17 | Device for treating malodorous gas based on capacitive coupling partition discharge plasma |
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| CN201310240768.1A CN103301728B (en) | 2013-06-17 | 2013-06-17 | Device for treating malodorous gas based on capacitive coupling partition discharge plasma |
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| CN108079759B (en) * | 2018-02-09 | 2020-03-06 | 上海睿筑环境科技有限公司 | Plasma equipment for treating pollutant in gas |
| CN113504426B (en) * | 2021-09-10 | 2021-11-16 | 中国电力科学研究院有限公司 | Device and method for testing inductive discharge anti-interference capability of intelligent equipotential operation equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003164728A (en) * | 2001-12-04 | 2003-06-10 | Canon Inc | Gas treatment method and gas treatment apparatus |
| CN1708204A (en) * | 2005-04-06 | 2005-12-14 | 大连理工大学 | Capacity coupling atmosphere glow-discharge plasma generator |
| CN101219338A (en) * | 2007-09-27 | 2008-07-16 | 深圳先进技术研究院 | Automobile tail gas purifier of low-temperature plasma body |
| CN101229484A (en) * | 2007-10-29 | 2008-07-30 | 江苏大学 | Corona discharge plasma reactor used for treating vehicle exhaust |
| CN101462021A (en) * | 2008-11-28 | 2009-06-24 | 江苏大学 | Harmful gas conversion device with non-thermal plasma induced by dielectric barrier discharge |
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2013
- 2013-06-17 CN CN201310240768.1A patent/CN103301728B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003164728A (en) * | 2001-12-04 | 2003-06-10 | Canon Inc | Gas treatment method and gas treatment apparatus |
| CN1708204A (en) * | 2005-04-06 | 2005-12-14 | 大连理工大学 | Capacity coupling atmosphere glow-discharge plasma generator |
| CN101219338A (en) * | 2007-09-27 | 2008-07-16 | 深圳先进技术研究院 | Automobile tail gas purifier of low-temperature plasma body |
| CN101229484A (en) * | 2007-10-29 | 2008-07-30 | 江苏大学 | Corona discharge plasma reactor used for treating vehicle exhaust |
| CN101462021A (en) * | 2008-11-28 | 2009-06-24 | 江苏大学 | Harmful gas conversion device with non-thermal plasma induced by dielectric barrier discharge |
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