CN202724994U - Device for governing waste gas by plasma catalysis - Google Patents
Device for governing waste gas by plasma catalysis Download PDFInfo
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- CN202724994U CN202724994U CN 201220341147 CN201220341147U CN202724994U CN 202724994 U CN202724994 U CN 202724994U CN 201220341147 CN201220341147 CN 201220341147 CN 201220341147 U CN201220341147 U CN 201220341147U CN 202724994 U CN202724994 U CN 202724994U
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Abstract
The utility model discloses a device for governing waste gas by plasma catalysis. The device comprises a dielectric-barrier discharge device and a power supply for driving the dielectric-barrier discharge device to discharge, wherein the dielectric-barrier discharge device comprises a cylindrical reaction container and an inner electrode; the cylindrical reaction container is provided with an air inlet and an air outlet; the inner electrode is arranged in the cylindrical reaction container; the side wall of the cylindrical reaction container consists of an insulated casing, a dielectric layer and an outer electrode arranged between the insulated casing and the dielectric layer; the outer electrode and the inner electrode are respectively communicated with two poles of the power supply; and a sintered metal fiber bundle catalyst is arranged in the cylindrical reaction container. According to the device disclosed by the utility model, the sintered metal fiber (SMF) bundle catalyst is combined with a dielectric-barrier discharge technology, so that the removal rate of VOCs (Volatile Organic Compounds) in the waste gas is increased while energy consumption is reduced.
Description
Technical field
The utility model relates to environmental protection technical field, specifically relates to a kind of device of the plasma-catalytic for administering waste gas.
Background technology
Along with the growth of economy, the raising of living standards of the people, people are also more and more higher to the requirement of living environment.The toxic harmful exhaust gas of factory and interior architecture coating is discharged, and has a strong impact on resident's health, has worsened living environment.Industry and building coating VOCs with peculiar smell have become the focus that the resident complains.Domestic many provinces and cities all carry out " clean air action " for this reason, and seeking the cleaning improvement technology governance VOCs of a kind of high efficiency, low energy consumption and the discharging of stench has been very urgent.
In traditional improvement method: absorption process, absorption method, condensation method, bioanalysis and low temperature plasma method.Wherein charcoal absorption and bioanalysis are the present common technologies of the industrial VOCs of control and stench.Bioanalysis has investment and the advantage such as operating cost is low, but floor space is large, and treatment effect is unstable, and is suitable for processing the shortcoming such as low concentration VOCs.And in the active carbon adsorption, although have the effect of good deodorizing and absorption VOCs before the adsorbance that reaches capacity, its maintenance management expense is high, useless charcoal regeneration trouble.
Lower temperature plasma technology has caused increasing concern in above-mentioned these technology, there is form in the 4th kind of material that plasma is known as except solid-state, liquid state and gaseous state, by the conducting fluid that electronics, ion, free radical and neutral particle form, the whole electroneutral that keeps.In low temperature plasma, the O, the OH isoreactivity particle that have the excitation of a large amount of high energy electrons and high energy electron to produce are oxidized to harmless object or low poisonous substance by series of physical, chemical reaction with the pernicious gas pollutant.Compare with foul waste gas improvement technology with other VOCs, lower temperature plasma technology has that technique is simple, handling process weak point, small investment, occupation of land is little, clearance is high, operating cost low (main manifestations is the electricity charge), the characteristics such as applied widely.
When utilizing Low Temperature Plasma Treating VOCs and foul waste gas, yet there are some problems: 1. under than low discharge voltage, some constitutionally stable VOCs are removed efficient not high (such as the benzene in the lacquer spraying waste gas, toluene etc.); 2. region of discharge is little, and the dusty gas time of staying is short; 3. the industrialization discharge power supply is had relatively high expectations, and needs stable discharging.
Deficiency for above-mentioned single plasma treatment technique, people have proposed the plasma-catalytic technology, conducted extensive research with industry test in, experimental result is desirable, overcome the deficiency of above-mentioned single plasma technique, yet major part is short life material (short-lived material) because the high energy that discharge of plasma in low temperature produces and active material have very, no matter existing plasma-catalytic combination technology is two-part or one-part form, all has the defective of the material that can not take full advantage of these generations.In addition, in VOCs or Deodor, the relative plasma-catalytic technology of lower temperature plasma technology also exists relative energy consumption high, under low discharge voltage, pollutants removal rate is not high, also has partial intermediate, causes secondary pollution, and in traditional plasma catalysis technique combination, the short-lived material utilization that exists discharge process to produce is not high, and this metalloid material Kaolinite Preparation of Catalyst of picture metallic fiber bundle, preparation process is complicated, the appendix amount is little, easily desorption.
Sintered metal fiber (SMF) is the present both at home and abroad more a kind of new material of research, and it is take nichrome fiber or Aludirome fiber as raw material, makes by cloth felt, compacting and high temperature sintering.Sintered metal electrode has loose structure, different aperture layers forms bore diameter gradient, the aperture take mesoporous (2-50nm) and macropore (＞50nm) as main, a large amount of connections or semi-connected hole are contained in inside, after certain processing, porosity reaches as high as 80-90%, and the pressure loss is little, high temperature resistant and easy processing is good catalyst carrier.（Igor?Yuranov，Albert?Renken，Zeolite/sintered?metal?fibers?composites?as?effective?structured?catalysts，Applied?Catalysis?A:General?281(2005)55-60）
The utility model content
The utility model provides a kind of device of the plasma-catalytic for administering waste gas, and this device adopts sintered metal fiber bundle catalyst to be catalyst, and simple in structure, the clearance of difficult degradation VOCs is high, has reduced simultaneously energy consumption.
A kind of device of the plasma-catalytic for administering waste gas, comprise the power supply of dielectric barrier discharge device and drive medium discharge-blocking device discharge, described dielectric barrier discharge device comprises: with the cylindricality reaction vessel of air inlet and gas outlet and be located at interior electrode in the cylindricality reaction vessel; The sidewall of described cylindricality reaction vessel by insulation crust, dielectric layer and be located at insulation crust and dielectric layer between external electrode form; Described external electrode and interior electrode are communicated with the two poles of the earth of described power supply respectively, are provided with sintered metal fiber bundle catalyst (hereinafter referred to as the SMF catalyst) in the described cylindricality reaction vessel.
For further reducing energy consumption, be provided with the support column of coaxial setting in the described cylindricality reaction vessel; Described interior electrode and sintered metal fiber bundle catalyst are in contact with one another and are wrapped on the described support column.Employing electrode in high pressure is wrapped on the support column, so that the SMF catalyst is in the process of catalysis, as reaction electrode, this effectively takes full advantage of various high energy, high activity short life (short-lived) material material that discharge produces again, has improved the clearance of difficult degradation VOCs.
For preventing the corrosion of the internal electrode of waste gas or plasma and SMF catalyst, further preferred technical scheme is, the described support column outside is provided with the second medium layer that surrounds described interior electrode and sintered metal fiber bundle catalyst, and the top of second medium layer and bottom seal with the cylindricality reaction vessel respectively.Described dielectric layer and second medium layer thickness can determine according to actual needs that as preferred technical scheme, the thickness of described dielectric layer is 6-8mm; The thickness of described second medium layer is 6-8mm.
For guaranteeing to form stable plasma in reaction vessel, as a kind of preferred technical scheme, described dispatch from foreign news agency is wire netting very.
The device of the plasma-catalytic for administering waste gas of the present utility model, the power supply that uses is high voltage source commonly used in the dielectric barrier discharge device, as further preferred, described high voltage source is the nanosecond high-voltage pulse power source, and its high-voltage pulse that act as by steep-front, narrow pulsewidth (nanosecond) is the plasma reactor energy supply.With this understanding, electronics is accelerated into and is high energy electron, and the larger ion of other quality since inertia have little time greatly to accelerate and substantially keep static, thereby avoided the DC corona speeding-up ion and the energy loss brought.
The materials such as insulation crust described in the utility model, dielectric layer, second medium layer, support column are insulating materials, can select the polymethyl methyl esters.
In the said apparatus, described sintered metal fiber bundle catalyst can adopt following method preparation, and the method is used surface treated sintered metal fiber Shu Zuowei carrier to load metal catalyst, has improved the load capacity of metallic catalyst in the product, and the method technique is simple, easy operating.
A kind of preparation method of sintered metal fiber bundle catalyst comprises:
(1) by anodizing to sintered metal fiber Shu Jinhang surface treatment, detailed process is as follows:
(i) at first under 0.5-0.7A current strength, oxidation processes 10-40min forms dense oxidation film on sintered metal fiber bundle surface;
(ii) then current strength is adjusted to 0.8-1.2A, oxidation processes 10-20min obtains the surface with the sintered metal fiber bundle of appendix hole;
(2) surface that step (1) is obtained is impregnated in the aqueous solution that contains metallic catalyst at least 30 minutes with the sintered metal fiber bundle of appendix hole, after load is finished, obtains sintered metal fiber bundle catalyst through calcining.
Anodizing be a kind of product with metal or alloy as anode, adopt the method for electrolysis to make its surface form the processing method of sull.The utility model is by further controlling the electrolytic condition of anodizing, the form of control sull, for example, at first under small electric intensity of flow condition, so that then the metal oxide film of sintered metal fiber bundle surface coverage densification passes through to increase the current strength of electrolysis, so that the partial oxide film on sintered metal fiber bundle surface is breakdown, further increase the porosity on sull surface, be conducive to next step impregnation process, be conducive to improve the load capacity of metallic catalyst.
Described metallic catalyst can be selected from transition metal and common noble metal with catalytic activity etc., considers catalytic effect and being easy to get property, and described metallic catalyst is one or more in positive tetravalence palladium catalyst, positive tetravalence platinum and the positive titanic catalyst.At this moment, the corresponding aqueous solution that contains metallic catalyst comprises one or more the aqueous solution in the acid of chlorine palladium, chloroplatinic acid, the titanium oxide.The acid of chlorine palladium, chloroplatinic acid, titanium oxide directly select the commercially available prod to get final product, and do not need further processing to process.
For guarantee fund's metal catalyst is carried on the sintered metal fiber bundle of described surface with the appendix hole smoothly, the concentration of the hydrotropic solution of described containing metal catalyst is 0.1-0.3mol/l.The concentration of the hydrotropic solution of metallic catalyst is excessively low, and load time is longer, and preparation cost is higher; The excessive concentration of the aqueous solution of metallic catalyst can cause the metallic catalyst load uneven, reduces the catalytic performance of catalyst, has improved preparation cost.
Under the prerequisite that guarantees greater catalytic efficient, for reducing the preparation cost of sintered metal fiber bundle catalyst, in the step (2), the ratio with the weight of the sintered metal fiber bundle of appendix hole that the weight that described metallic catalyst adds and step (1) prepare is 1-5:100.For further accelerating impregnating speed, the temperature of described maceration extract is preferably 60-80 degree centigrade.
Described sintered metal fiber bundle can be selected multiple metallic fiber bundle through sintering processes or metallic alloy fiber bundle, and for improving catalytic efficiency, preferred sintered metal fiber bundle is sintrered nickel evanohm fibre bundle or cemented iron Cr-Al alloy fibre bundle; As further preferred, described sintered metal fiber bundle is that diameter is sintrered nickel evanohm fibre bundle or the cemented iron Cr-Al alloy fibre bundle of 10-30 μ m.
The load capacity of metallic catalyst is high in the sintered metal fiber bundle catalyst that is obtained by above-mentioned preparation method, difficult drop-off, and when utilizing this catalyst treatment VOCs, catalytic activity is good, and the removal of pollutants rate is high.As further preferred technical scheme, the load capacity of metallic catalyst is 1-5% in the described sintered metal fiber bundle catalyst.The load capacity of the metallic catalyst described in the utility model all refers to the weight portion with the metallic catalyst with catalytic activity of the intrafascicular load of sintered metal fiber of appendix hole of 100 weight portions.
Adopt the dielectric barrier discharge technology, can under atmospheric pressure produce the low gas ions of low temperature of large volume, high-energy-density, do not need the vacuum equipment just can be in room temperature or near the needed active particle of acquisition chemical reaction under the room temperature condition.The utility model adopts sintered metal fiber bundle (SMF) catalyst to combine with the dielectric barrier discharge technology, when reducing energy consumption, has improved the clearance of degraded VOCs.
Compared with prior art the utlity model has following beneficial effect:
(1) preparation method of sintered metal fiber bundle catalyst of the present utility model, technique is simple, easy operating control, by the control electrolytic condition, at the dense oxidation film of sintered metal fiber bundle surface formation with gap structure, greatly improved the appendix amount of metallic catalyst, and the sintered metal fiber bundle catalyst for preparing have stronger corrosion resistance, long service life;
(2) device of the plasma-catalytic for administering waste gas of the present utility model, adopt and the high-field electrode winding method, so that the SMF catalyst is in the process of catalysis, again as reaction electrode, this effectively takes full advantage of various high energy, high activity short life material that discharge produces, also avoid the electrode corrosion problem, reduced energy consumption when improving the clearance of difficult degradation VOCs.
Description of drawings
Fig. 1 is the structural representation of the device of the plasma-catalytic for administering waste gas of the present utility model.
Fig. 2 is the structural representation of the another kind of embodiment of device of the plasma-catalytic for administering waste gas of the present utility model.
Fig. 3 is the measuring principle figure that utilizes Lee's V-Q Sa such as method meter nomogram 1 shown device discharge peak threshold voltage and energy consumption.
Fig. 4 is the XPS figure that embodiment 1 prepares sintered metal fiber bundle catalyst.
The specific embodiment
Embodiment 1
The preparation of sintered metal fiber bundle catalyst:
It is sintrered nickel evanohm fibre bundle (Xi'an Filter Metal Materials Co., Ltd. of 22 microns with the 1g diameter, length is about 47cm) anode of access electrolytic cell, electrolyte is 10% dilute sulfuric acid, power acquisition is with the power supply of dc source device, at first electric current is adjusted to 0.8A, processed 30 minutes; Then, electric current is adjusted to 1.0A, processed 20 minutes, turn off power supply, the sintrered nickel evanohm fibre bundle of finishing dealing with is taken out, clear water cleaning fiber bundle surface, (quality is about 1g in oven dry, mass change is small before and after the surface treatment of sintrered nickel evanohm fibre bundle), obtain the sintered metal fiber bundle with the appendix hole, stand-by.
Dispose as required the titanium dioxide aqueous solution of 5ml 0.1mol/l, with prepare with 60 degrees centigrade of dippings of the sintered metal fiber bundle of appendix hole 45 minutes until liquid all be adsorbed, after absorption is finished, there is the sintered metal fiber bundle of metallic catalyst to take out absorption, 500 degrees centigrade of lower calcinings 2 hours, obtaining load capacity was 4% sintered metal fiber bundle catalyst.
The XPS that said method prepares sintered metal fiber bundle catalyst detects spectrogram such as Fig. 4, has occurred titanic typical crest among Fig. 4 between 458-460eV and 464-465eV, illustrates that titanic has been carried on the sintrered nickel evanohm fibre bundle.
In the present embodiment, load capacity is the computational load amount that the amount by the titanium dioxide that adds in the actual experiment process and sintered metal fiber bundle calculates.In the sintered metal fiber bundle catalyst that obtains at last, the actual negative carrying capacity of metallic catalyst need to detect by XPS and then be back-calculated to obtain.The actual negative carrying capacity is generally less than the computational load amount.
The preparation of sintered metal fiber bundle catalyst:
Basic identical with embodiment 1 preparation method, difference is:
Sintrered nickel evanohm fibre bundle replaces with cemented iron Cr-Al alloy fibre bundle;
0.1mol/l the titanium dioxide aqueous solution with the aqueous solution replacement (wherein the mol ratio of palladium and platinum is 1:1) of the acid of the chlorine palladium of 0.1mol/l and chloroplatinic acid.Utilize the method among the embodiment 1 to prepare sintered metal fiber bundle catalyst.
Embodiment 3
As shown in Figure 1: a kind of device of the plasma-catalytic for administering waste gas: comprise the power supply 2 of dielectric barrier discharge device 1 and drive medium discharge-blocking device discharge, dielectric barrier discharge device 1 comprises: with the cylindricality reaction vessel 5 of air inlet 3 and gas outlet 4 and be located at interior electrode 6 in the cylindricality reaction vessel 5; The sidewall of cylindricality reaction vessel 5 by insulation crust 7, dielectric layer 8 and be located at insulation crust 7 and dielectric layer 8 between external electrode 9 form; External electrode 9 and interior electrode 6 are communicated with the two poles of the earth of power supply 2 respectively, and external electrode 9 is connected with ground simultaneously, is provided with the support column 10 of coaxial setting in the cylindricality reaction vessel 5; Interior electrode 6 and sintered metal fiber bundle catalyst are in contact with one another and are wrapped on the support column 10.
In the said apparatus:
Be provided with hollow interlayer between insulation crust 7 and the dielectric layer 8, thickness is 3mm, is used for putting external electrode 9, and external electrode 9 is the wire netting that circumferentially arranges.
Dielectric layer 8 thickness are 7mm.
The actual use procedure of device of the plasma-catalytic that be used for to administer waste gas of present embodiment is: when industrial VOCs behind air inlet 3 accesss to plant, under the synergy of plasma and catalyst, target contaminant is decomposed into the less material of harm, as CO through series reaction
2Etc. little molecule, then 4 discharges from the gas outlet.
Embodiment 4
As shown in Figure 2: the another kind of device that is used for the plasma-catalytic of improvement waste gas, this apparatus structure is substantially the same manner as Example 3, difference is: the second medium layer 11 of electrode 6 and sintered metal fiber bundle catalyst in support column 10 outsides are provided with and surround, the thickness of second medium layer 11 is 7mm, and the top of second medium layer 11 and bottom seal with cylindricality reaction vessel 5 respectively.In the use procedure, second medium layer 11 has been avoided the corrosion of plasma or the internal electrode 6 of waste gas and sintered metal fiber bundle catalyst, the service life of having improved this device.
Performance Detection example 1
As shown in Figure 3: measure calculating discharge energy consumption by Li Sa such as method, detect exhaust gas component, thereby efficient, the economy of whole system are assessed.Wherein, the structure of Li Sa such as method checkout gear is prior art, the high-tension transformer 13, oscillograph 14, electric capacity 15 and the dielectric barrier discharge device 1 that generally comprise power supply 12, power supply 12 carried out supercharging.
Simultaneously, be the high efficiency of check SMF catalyst electrode, repeat experiment in two months, and carry out the catalyst expulsion rate and detect.
Adopt two measure-alike, the plasma reactor of structural similarity is processed target contaminant, the device that one of them provides for embodiment 4, another one is the device that interior electrode does not have and the SMF catalysis electrode mix to twine.With Nano-TiO
2Be example, adopt the method for preparing catalyst of embodiment 1 to prepare Nano-TiO
2/ SMF catalyst is with Nano-TiO
2/ SMF is as the catalyst of this experiment.The used target contaminant of this example is representative difficult degradation VOCs dimethylbenzene (solvent commonly used is such as paint solvent).Two devices are processed tolerance and are all passed through mass flow controller, are fixed as 800ml/min.
When frequency is fixed as 300pps, when the input crest voltage was 23.6kV, the dimethylbenzene degradation rate that two group reaction devices obtain was 92.7% and 64.7%.Utilize the device schematic diagram of Fig. 3, namely by Lee's V-Q Sa such as method, after measurement calculates the input energy of reactor, can obtain the energy yield of two group reaction devices degradeds dimethylbenzene, i.e. the specific energy consumption dimethylbenzene amount of degrading, simultaneously, after having adopted catalysis electrode, detected CO in the tail gas
2Selective, namely target contaminant finally is converted into picture CO
2The less end product of harm the results are shown in Table 1 like this.
Table 1 is administered dimethylbenzene gas experiment test data:
As shown in Table 1, adopt the mode with interior electrode and the winding of SMF catalyst, selective, the dimethylbenzene degradation rate of its carbon dioxide increase greatly, and the energy yield of degraded is higher.In whole test experiments process, SMF catalyst experiment repetitive rate is high, and after using continuously experiment in two months, the plasma-catalytic effect is still good.
Utilize same detection method, detect the SMF catalyst paraxylene degradation rate that is prepared by embodiment 2, degradation rate is 85%, also is higher than typical catalyst of the prior art.
Performance Detection example 2
Embodiment 1 is prepared the SMF catalyst be divided into three parts, the desorption rate by ultrasonic oscillation detection in 1 hour catalyst repeats three groups, and testing result sees Table 2.
The expulsion rate of table 2SMF catalyst
As shown in Table 2, the SMF catalyst that embodiment 1 prepares is not easy desorption, long service life.
Claims (7)
1. device of be used for administering the plasma-catalytic of waste gas, comprise the power supply of dielectric barrier discharge device and drive medium discharge-blocking device discharge, described dielectric barrier discharge device comprises: with the cylindricality reaction vessel of air inlet and gas outlet and be located at interior electrode in the cylindricality reaction vessel; The sidewall of described cylindricality reaction vessel by insulation crust, dielectric layer and be located at insulation crust and dielectric layer between external electrode form; Described external electrode and interior electrode are communicated with the two poles of the earth of described power supply respectively, it is characterized in that, are provided with sintered metal fiber bundle catalyst in the described cylindricality reaction vessel.
2. the device of the plasma-catalytic for administering waste gas according to claim 1 is characterized in that, is provided with the support column of coaxial setting in the described cylindricality reaction vessel; Described interior electrode and sintered metal fiber bundle catalyst are in contact with one another and are wrapped on the described support column.
3. the device of the plasma-catalytic for administering waste gas according to claim 1 is characterized in that described dispatch from foreign news agency is wire netting very.
4. the device of the plasma-catalytic for administering waste gas according to claim 3, it is characterized in that, the described support column outside is provided with the second medium layer that surrounds described interior electrode and sintered metal fiber bundle catalyst, and the top of second medium layer and bottom seal with the cylindricality reaction vessel respectively.
5. the device of the plasma-catalytic for administering waste gas according to claim 4 is characterized in that the thickness of described dielectric layer is 6-8mm.
6. the device of the plasma-catalytic for administering waste gas according to claim 5 is characterized in that the thickness of described second medium layer is 6-8mm.
7. the device of the plasma-catalytic for administering waste gas according to claim 1 is characterized in that described power supply is the nanosecond high-voltage pulse power source.
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| CN 201220341147 CN202724994U (en) | 2012-07-13 | 2012-07-13 | Device for governing waste gas by plasma catalysis |
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| CN 201220341147 CN202724994U (en) | 2012-07-13 | 2012-07-13 | Device for governing waste gas by plasma catalysis |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105879597A (en) * | 2014-12-24 | 2016-08-24 | 苏州超等环保科技有限公司 | Spiral-type plasma high-voltage discharge tube exhaust gas treatment device |
| CN106693854A (en) * | 2017-01-22 | 2017-05-24 | 浙江大学 | Low-temperature plasma modified catalyst device and method for catalytic oxidation of dimethyl sulfide |
| CN107008122A (en) * | 2017-04-24 | 2017-08-04 | 上海电力学院 | The experimental provision of dusty gas is catalytically decomposed in plasma body cooperative |
| CN108826407A (en) * | 2018-07-20 | 2018-11-16 | 广东美的厨房电器制造有限公司 | Ceiling mounting type smoke machine |
-
2012
- 2012-07-13 CN CN 201220341147 patent/CN202724994U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105879597A (en) * | 2014-12-24 | 2016-08-24 | 苏州超等环保科技有限公司 | Spiral-type plasma high-voltage discharge tube exhaust gas treatment device |
| CN106693854A (en) * | 2017-01-22 | 2017-05-24 | 浙江大学 | Low-temperature plasma modified catalyst device and method for catalytic oxidation of dimethyl sulfide |
| CN106693854B (en) * | 2017-01-22 | 2019-01-25 | 浙江大学 | The method of low-temperature plasma modified catalyst device and catalysis oxidation methyl sulfide |
| CN107008122A (en) * | 2017-04-24 | 2017-08-04 | 上海电力学院 | The experimental provision of dusty gas is catalytically decomposed in plasma body cooperative |
| CN108826407A (en) * | 2018-07-20 | 2018-11-16 | 广东美的厨房电器制造有限公司 | Ceiling mounting type smoke machine |
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