CN111265978B - Compact plasma concerted catalysis organic waste gas processing apparatus - Google Patents
Compact plasma concerted catalysis organic waste gas processing apparatus Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
- B01D53/323—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/864—Removing carbon monoxide or hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
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- B01D—SEPARATION
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- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
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- B01D2257/7027—Aromatic hydrocarbons
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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Abstract
The invention relates to the technical field of organic waste gas purification, in particular to a compact plasma concerted catalysis organic waste gas treatment device, which comprises electrodes and insulating media spaced in adjacent electrodes, wherein each electrode comprises an outer electrode, a porous metal wire electrode and an inner electrode, and each insulating medium comprises an inner medium pipe and an outer medium pipe; the inner medium pipe is sleeved outside the inner electrode, an inner air gap is arranged between the inner medium pipe and the inner electrode, the porous metal wire electrode is uniformly and equidistantly wound outside the inner medium pipe, the outer medium pipe is sleeved outside the inner medium pipe, an outer air gap is arranged between the outer medium pipe and the inner medium pipe, and the porous metal wire electrode is loaded with a catalyst; the device of the invention adopts a compact structure, combines a low-temperature plasma method and a catalysis method, and can treat and purify the organic waste gas more efficiently by utilizing the synergistic effect of the low-temperature plasma and the catalyst.
Description
Technical Field
The invention relates to the technical field of organic waste gas purification, in particular to a compact plasma concerted catalysis organic waste gas treatment device.
Background
The low-temperature plasma is a non-equilibrium plasma which can be generated under atmospheric pressure, the electron temperature of the low-temperature plasma is far higher than the temperature of heavy particles, and the overall temperature of the low-temperature plasma is close to room temperature, so that the low-temperature plasma is easy to generate and has higher chemical activity. The low-temperature plasma contains a large number of active particles such as high-energy electrons, excited atoms, free radicals and the like, and the active particles can react with organic matters to crack organic macromolecules into atoms or groups and further oxidize and reduce the atoms or groups into carbon dioxide and water. Therefore, the low-temperature plasma has wide application prospect in the environmental protection field of organic waste gas treatment and the like.
The low-temperature plasma is generally generated by dielectric barrier discharge, corona discharge, or the like. The dielectric barrier discharge is that an insulating medium is inserted into a discharge space between two metal electrodes, and gas molecules in the discharge space are ionized and accelerated under the action of a strong electric field to finally generate an ionization channel penetrating through the whole space. The existence of the insulating medium can avoid the transition of discharge to spark or arc discharge, and the dielectric barrier discharge is a method for generating low-temperature plasma under normal temperature and atmospheric pressure.
The prior research shows that the effect of the catalyst introduced into the dielectric barrier discharge plasma for degrading the organic waste gas under the synergistic action of the two is obviously better than the effect of the catalyst used alone by using low-temperature plasma or under the same temperature condition, and not only is the superposition of the effects of the two. Therefore, the synergistic effect of the low-temperature plasma and the catalyst has attracted much attention in the field of environmental protection such as organic waste gas treatment. How to design a high-efficiency plasma co-catalysis exhaust gas treatment device with simple structure, strong plasma co-catalysis effect and low cost is a key point for promoting the application of the device in the industrial and scientific research fields.
The existing device or method for treating organic waste gas has physical adsorption, plasma treatment, catalytic purification and the synergistic effect of plasma and catalyst. In the device and method for treating VOCs disclosed in CN105854510A, VOCs are adsorbed by an adsorption feed liquid, and the adsorption feed liquid is desorbed by a constant temperature device and a desorption device. A single dielectric barrier low temperature plasma reactor as described in patent CN105934064A, which improves the plasma generation efficiency by adding a toothed inner electrode. The catalytic purification equipment for VOCs, as described in patent CN208694715U, performs photodegradation on VOCs by UVC lamps and photocatalyst. A treatment apparatus and process for VOCs as described in patent CN107252627A, which utilizes the synergistic effect of low temperature plasma and ultraviolet light catalysis to treat VOCs. However, the above methods have drawbacks in terms of process efficiency, by-products, applicability to different types and concentrations of VOCs, system pressure drop, and energy efficient utilization.
Therefore, the device provided by the invention, namely the compact plasma-concerted catalysis organic waste gas treatment device, utilizes the synergistic effect of the plasma and the catalyst to treat the organic waste gas, places the plasma and the catalytic reaction in the same reactor, adopts a novel catalyst introduction mode, effectively utilizes electric energy, reduces the volume of the device, optimizes the structure of the inner electrode, and can efficiently and deeply degrade the organic waste gas.
Disclosure of Invention
The invention aims to provide a compact plasma concerted catalysis organic waste gas treatment device to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a compact plasma concerted catalysis organic waste gas treatment device comprises electrodes and insulating media spaced in adjacent electrodes, wherein the electrodes comprise outer electrodes, porous metal wire electrodes and inner electrodes, the inner electrodes can be selected from threaded rods, needle rods and pagoda rod structures, and the insulating media comprise inner medium pipes and outer medium pipes;
the inner medium pipe is sleeved outside the inner electrode, an inner air gap is arranged between the inner medium pipe and the inner electrode, the porous metal wire electrode is uniformly and equidistantly wound outside the inner medium pipe, the outer medium pipe is sleeved outside the inner medium pipe, an outer air gap is arranged between the outer medium pipe and the inner medium pipe, and the porous metal wire electrode is loaded with a catalyst;
the gas flow equalizing device is characterized in that the two ends of the inner electrode, the inner medium pipe and the outer medium pipe are respectively and fixedly connected with a gas inlet and outlet plug and a flow equalizing plug, a set of gas inlet and two sets of gas outlets are formed in the surface of the gas inlet and outlet plug, the gas inlet is communicated with an inner gas gap, the gas outlet is communicated with an outer gas gap, a sealing flange is fixedly connected to the outer end of the flow equalizing plug, a gas backflow cavity is formed between the flow equalizing plug and the sealing flange, multiple groups of gas inlet holes are formed in the surface of the flow equalizing plug, the gas inlet holes are communicated with the inner gas gap and the gas backflow cavity, multiple groups of gas outlet holes are formed in the surface of the flow equalizing plug, and the gas outlet holes are communicated with the outer gas gap and the gas backflow cavity.
Preferably, the inner electrode is made of stainless steel, and the radius length of the inner electrode is 4-12 mm and the length of the inner electrode is 360-480 mm.
Preferably, the inner medium tube is made of quartz glass, and is 320-440 mm in length, 28mm in inner diameter and 1.5-2.5 mm in wall thickness.
Preferably, the porous metal wire electrode is a sintered porous metal fiber material, and the catalyst supported by the porous metal wire electrode is selected according to specific gas components.
Preferably, the outer medium pipe is made of quartz glass or polytetrafluoroethylene, and is 280-400 mm long, 38mm in inner diameter and 2-2.5 mm in wall thickness.
Preferably, the outer electrode is a stainless steel sleeve, a copper mesh or a copper foil, the length of the outer electrode is 120-320 mm, and the inner wall of the outer electrode is tightly attached to the outer wall of the outer medium pipe.
Preferably, the flow equalizing plug is made of polytetrafluoroethylene materials, a circular boss is integrally connected to the surface of one side of the flow equalizing plug, the inner diameter of the boss of the flow equalizing plug is 31-33 mm, the outer diameter of the boss of the flow equalizing plug is 38mm, the outer peripheral wall of the boss of the flow equalizing plug is tightly attached to the inner peripheral wall of one end of the outer medium pipe, and the inner peripheral wall of the boss of the flow equalizing plug is tightly attached to the outer peripheral wall of one end of the inner medium pipe;
the air outlet holes are circular through holes with the diameter of 1-2 mm, and are uniformly distributed on the surface of the boss of the flow equalizing plug;
a groove is formed in the boss of the flow equalizing plug;
the air inlet holes are circular through holes with the diameter of 1-2 mm, and the air inlet holes are uniformly distributed on the surface of the groove of the flow equalizing plug.
Preferably, the air inlet and outlet plug is made of polytetrafluoroethylene material, a circular boss is integrally connected to the surface of one side of the air inlet and outlet plug, and the size of the boss of the air inlet and outlet plug is the same as that of the boss of the flow equalizing plug;
a groove is formed inside the boss of the air inlet/outlet plug;
the air outlet is arranged on the surface of the boss of the air inlet and outlet plug;
the air inlet is arranged on the surface of the groove of the air inlet and outlet plug.
Compared with the prior art, the invention has the beneficial effects that:
1) this compact plasma concerted catalysis organic waste gas processing apparatus is used for handling VOCs gas through dielectric barrier discharge plasma and catalysis synergism, utilizes first section plasma to split VOCs molecule into little group, is further degraded into low harm or harmless gas under second section plasma and catalyst synergism afterwards. Compared with the single use of plasma or catalytic reaction, the organic waste gas is degraded more efficiently.
2) According to the compact plasma co-catalysis organic waste gas treatment device, the inner air gap electrode can be a spiral rod-shaped electrode, a needle rod-shaped electrode or a pagoda-shaped electrode, so that the non-uniform degree of an electric field in an air gap is increased, the plasma can be generated at a lower voltage, and the plasma generation efficiency is improved; meanwhile, the structure of the inner electrode can be changed, including factors such as height, the number of units (needles or pagodas) with the same section, distance between sections and the like.
3) Compared with a common photocatalytic reactor, the compact plasma concerted catalysis organic waste gas treatment device has the advantages that the porous metal fiber wire loads the photocatalyst, ultraviolet light generated by the discharge plasmas of the inner air gap and the outer air gap is utilized, extra ultraviolet light equipment is omitted, the cost is reduced, and the size of the device is reduced.
4) The compact plasma co-catalysis organic waste gas treatment device adopts a compact structure, and compared with a common two-section device, the compact plasma co-catalysis organic waste gas treatment device has the advantages that the volume of the device is reduced, and the space utilization rate is improved; compared with a filling type plasma catalysis synergistic device, the device has the advantages of small air resistance, low pressure drop and improved treatment efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a perspective view of the present invention;
FIG. 3 is a schematic diagram of three structures of the inner electrode of the present invention;
FIG. 4 is a schematic structural diagram of the present invention;
FIG. 5 is a cross-sectional view of the present invention;
FIG. 6 is a schematic structural diagram of an inlet/outlet air-tight sealing structure according to the present invention;
FIG. 7 is a schematic view of the gas recirculation chamber of the sealing flange of the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
101 flow equalizing plug, 102 air outlet hole, 103 air inlet hole, 2 external electrode, 301 air inlet and outlet plug, 302 air outlet, 303 air inlet, 4 porous metal wire electrode, 501 internal medium pipe, 502 internal air gap, 6 internal electrode, 701 external medium pipe, 702 external air gap, 801 sealing flange and 802 gas reflux cavity.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a compact plasma concerted catalysis organic waste gas treatment device mainly comprises a flow equalizing plug 101, an outer electrode 2, an air inlet and outlet plug 301, a porous metal wire electrode 4, an inner medium pipe 501, an inner electrode 6, an outer medium pipe 701 and a sealing flange 801. Wherein the inner electrode 6, the inner medium tube 501 and the porous metal wire electrode 4 form a first section of dielectric barrier discharge unit, and discharge occurs in the inner air gap 502. The porous metal wire electrode 4, the outer dielectric tube 701 and the outer electrode 2 form a second section of dielectric barrier discharge unit, and discharge occurs in the outer air gap 702. The inner electrode 6 and the outer electrode 2 are connected with the low-voltage end of a power supply and are grounded, and the porous metal wire electrode 4 penetrates through the flow equalizing plug 101 and is connected with the high-voltage end of the power supply.
The flow equalizing plug 101 and the gas inlet and outlet plug 301 are used for fixing the inner and outer medium pipes and the stainless steel metal electrode, and gas inlet and outlet holes are formed in the upper surfaces of the flow equalizing plug 101 and the gas inlet and outlet plug 301. The sealing flange 801 and the flow straightener 101 form a gas return chamber 802 for returning gas that has passed through the inner gas gap 502 to the outer gas gap 702. The gas enters the device from the gas inlet 303 of the gas inlet and outlet plug 301, firstly reaches the inner air gap 502, then enters the sealing flange gas return cavity 802 from the gas inlet hole 103 of the flow equalizing plug 101, enters the outer air gap 702 through the gas outlet hole 102, and finally is discharged from the gas outlet 302 of the gas inlet and outlet plug 301.
The inner electrode 6 is made of stainless steel material, has a radius of 4-12 mm and a length of 360-480 mm, and serves as a first section of dielectric barrier discharge low electrode.
The inner medium tube 501 is made of quartz glass, is 320-440 mm long, 28mm in inner diameter and 1.5-2.5 mm in wall thickness, and serves as a first section of medium for blocking discharge.
The porous metal wire electrode 4 is sintered porous metal fiber, wherein the supported catalyst can be selected according to specific gas components, for example, MnO can be selected when the main gas component is toluene2/Al2O3、CuO/MnO2Etc., or a photocatalyst having more excellent catalytic performance, such as TiO2And the like. The porous metal wire electrode 4 is uniformly wound on the inner medium tube 501 at equal intervals and is used as a high-voltage electrode for the first section of dielectric barrier discharge and the second section of dielectric barrier discharge.
The outer medium tube 701 is made of quartz glass or polytetrafluoroethylene, is 280-400 mm long, 38mm in inner diameter and 2-2.5 mm in wall thickness and serves as a second section of medium for blocking discharge.
The outer electrode 2 is a stainless steel metal sleeve which is sleeved on the outer medium pipe 701 and is 120-320 mm long, and the inner wall of the outer electrode is tightly attached to the outer wall of the outer medium pipe 701. A copper mesh or foil may also be used to tightly wind the outer dielectric tube 701 to serve as the outer electrode 2.
As shown in fig. 3, the inner electrode 6 may be selected from a threaded rod, a needle rod, and a pagoda rod structure. The threaded rod can use threads with different heights and pitches, and the needle rod and the pagoda rod can change the number and distribution of needles or pagoda structures with the same section and the distance between the sections of the structures. Additional structure on the stainless steel metal rod can increase the non-uniformity of the air gap electric field, so that the plasma is generated at a lower voltage.
As shown in FIG. 4, the flow equalizing plugs 101 are made of polytetrafluoroethylene, the boss portions of the flow equalizing plugs are marked by shadows, the cross sections of the flow equalizing plugs are circular rings with the inner diameter of 31-33 mm and the outer diameter of 38mm, and the air outlet holes 102 are circular through holes with the diameter of 1-2 mm and are uniformly distributed on the surfaces of the circular rings. The blank part is circular concave station, and middle black round hole is used for fixed inner electrode, and inlet port 103 is the circular through-hole of diameter 1 ~ 2mm, evenly distributed on circular concave station surface.
As shown in fig. 5, the inner media pipe 501 is inserted into the recess and the outer media pipe 701 is fitted over the boss. The air inlet and outlet plugs 301 are also of the same material and construction except that only one through hole is located on the boss for device air inlet and two through holes are located on the boss for device air outlet.
As shown in fig. 6 and 7, the details of the airflow circuit of the device: gas enters the inner air gap 502 from the gas inlet 303, after being treated by the first section of dielectric barrier discharge plasma, the gas enters the sealing flange gas reflux cavity 802 from the flow equalizing plug gas inlet 103, then the gas enters the outer air gap 702 through the flow equalizing plug gas outlet 102, and after being treated by the second section of dielectric barrier discharge plasma, the gas is discharged from the gas outlet 302. In order to keep the airflow flowing back stably, the flow equalizing plug 101 adopts multiple air inlet and outlet holes and is uniformly distributed on the flow equalizing plug 101. The distance between the plane of the gas plug 101 without the boss and the inner wall of the sealing flange 801 parallel to the plane, namely the depth of the gas return cavity is 16-22 mm. The sealing flange 801 and the flow equalizing plug 101 are fixedly connected through 6 sets of nuts 804 and bolts 805. In order to ensure the air tightness of the device, a circle of sealing rubber ring groove 803 is arranged at the corresponding position of the sealing flange 801 and the flow equalizing plug 101 and used for placing a sealing rubber ring.
Principle of operation
The plasma co-catalysis organic waste gas treatment device utilizes a compact device structure to simultaneously generate two sections of dielectric barrier discharge plasmas in one discharge tube. The inner porous metal wire electrode 4 is wound on the inner medium tube 501 and is used as a high-voltage electrode for preventing discharge by an inner medium layer and an outer medium layer, so that the utilization efficiency of an electric field can be improved.
1) When gas flows through the inner air gap 502, dielectric barrier discharge plasma is generated between the inner electrode 6 and the porous metal wire electrode 4, the organic waste gas is subjected to primary treatment, high-energy active particles in the plasma firstly destroy and decompose organic waste gas molecules into smaller fragments such as radicals and atoms, and meanwhile, substances with strong oxidizing property such as ozone and hydroxyl radicals generated by dielectric barrier discharge react with the organic waste gas molecular fragments to generate small molecular substances.
2) Then, the primarily treated organic waste gas enters the outer air gap 702 through the gas reflux cavity, dielectric barrier discharge plasma is generated between the outer electrode 2 and the porous metal wire electrode 4, the catalyst loaded on the porous metal wire electrode 4 participates in the reaction, and the organic waste gas is efficiently degraded into low-harm or harmless substances such as water, carbon dioxide and the like under the synergistic action of the plasma and the catalyst.
3) The catalyst supported by the porous wire electrode 4 can be flexibly selected according to specific gas components. The catalyst can obviously reduce the activation energy required by the reaction, accelerate the reaction rate and reduce the generation of byproducts; a large number of high-energy active particles in the plasma have extremely strong chemical reaction activity, the catalyst can be activated without additional heating, and the organic waste gas molecules can be promoted to be more efficiently decomposed and deeply oxidized under the synergistic effect of the high-energy active particles and the catalyst. If the gas component is relatively single, the catalyst can be selected for its main component, such as toluene as main pollutant component, MnO can be selected2/Al2O3Or CuO/MnO2And the like.
4) If the gas components are complex and the concentration of each gas pollutant is not high, TiO with more comprehensive catalytic performance can be used2And the like, and the photocatalyst can effectively degrade pollutants such as formaldehyde, benzene, toluene, xylene, ammonia, Total Volatile Organic Compounds (TVOC) and the like. The photocatalyst used in the present apparatus is a chelate-type photocatalyst in which other active catalytic elements are chelated, and the absorption range of light waves is increased. Meanwhile, ultraviolet light generated by the dielectric barrier discharge plasma in the inner and outer air gaps is utilized to carry out photocatalytic reaction, and additional ultraviolet light equipment is not needed.
5) The photocatalyst is loaded in the porous metal wire electrode instead of being filled in the air gap, and the porous metal wire electrode 4 serves as a high-voltage electrode and a catalyst carrier, so that the gas resistance is effectively reduced, and the pressure loss is reduced.
The application effect is as follows:
toluene is used as a VOC model compound, the initial concentration is 200ppm, a needle electrode is selected as an inner electrode in the first-stage dielectric barrier discharge, and the discharge gap is 3 mm; in the second stage, the medium blocks discharge with a discharge gap of 3mm and adopts 0.3% Pt/TiO2The catalyst is loaded on the porous metal fiber electrode; the length of the two sections of discharge is 150 mm.
For comparison, the toluene degradation condition under the combined action of only the first-stage dielectric barrier discharge and the first-stage and second-stage dielectric barrier discharge but without the supported catalyst is also considered in the experimental process, and the toluene degradation rate and CO degradation rate under different discharge forms are shown below2The selectivity varies with the specific energy input (specific energy input).
It can be seen that the combined action of the two dielectric barrier discharges can effectively promote the degradation of toluene and improve CO compared with the first dielectric barrier discharge only2Selectivity; moreover, the catalyst is loaded on the metal fiber electrode of the second section of dielectric barrier discharge, so that the toluene degradation rate and CO can be further improved2And (4) selectivity.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A compact plasma concerted catalysis organic waste gas treatment device comprises electrodes and insulating media spaced in adjacent electrodes, and is characterized in that the electrodes comprise outer electrodes (2), porous metal wire electrodes (4) and inner electrodes (6), the inner electrodes (6) are selected from one of threaded rod, needle rod and pagoda rod structures, and the insulating media comprise inner medium tubes (501) and outer medium tubes (701);
the inner medium tube (501) is sleeved outside the inner electrode (6), an inner air gap (502) is arranged between the inner medium tube (501) and the inner electrode (6), the porous metal wire electrode (4) is uniformly and equidistantly wound outside the inner medium tube (501), the outer medium tube (701) is sleeved outside the inner medium tube (501), an outer air gap (702) is arranged between the outer medium tube (701) and the inner medium tube (501), and a catalyst is loaded on the porous metal wire electrode (4);
the two ends of the inner electrode (6), the inner medium pipe (501) and the outer medium pipe (701) are respectively and fixedly connected with an air inlet and outlet plug (301) and a flow equalizing plug (101), the surface of the air inlet and outlet plug (301) is provided with a group of air inlets (303) and two groups of air outlets (302), the air inlet (303) is communicated with the inner air gap (502), the air outlet (302) is communicated with the outer air gap (702), the outer end of the flow equalizing plug (101) is fixedly connected with a sealing flange (801), a gas reflux cavity (802) is arranged between the flow equalizing plug (101) and the sealing flange (801), a plurality of groups of air inlet holes (103) are arranged on the surface of the flow equalizing plug (101), the air inlet holes (103) are communicated with an inner air gap (502) and a gas return cavity (802), the surface of the flow equalizing plug (101) is provided with a plurality of groups of air outlet holes (102), and the air outlet holes (102) are communicated with an outer air gap (702) and a gas backflow cavity (802).
2. The compact plasma co-catalysis organic waste gas treatment device according to claim 1, wherein the inner electrode (6) is made of stainless steel, and the inner electrode (6) has a radius length of 4-12 mm and a length of 360-480 mm.
3. The compact plasma co-catalysis organic waste gas treatment device according to claim 1, wherein the inner medium pipe (501) is made of quartz glass, and the length of the inner medium pipe (501) is 320-440 mm, the inner diameter of the inner medium pipe is 28mm, and the wall thickness of the inner medium pipe is 1.5-2.5 mm.
4. A compact plasma-co-catalytic organic waste gas treatment device according to claim 1, characterized in that the porous wire electrode (4) is a sintered porous metal fiber material, and the catalyst carried by the porous wire electrode (4) is selected according to specific gas components.
5. The compact plasma co-catalysis organic waste gas treatment device according to claim 1, wherein the outer medium pipe (701) is made of quartz glass or polytetrafluoroethylene, and the length of the outer medium pipe (701) is 280-400 mm, the inner diameter of the outer medium pipe is 38mm, and the wall thickness of the outer medium pipe is 2-2.5 mm.
6. The compact plasma co-catalysis organic waste gas treatment device according to claim 1, wherein the outer electrode (2) is a stainless steel sleeve, a copper net or a copper foil, the length of the outer electrode (2) is 120-320 mm, and the inner wall of the outer electrode (2) is tightly attached to the outer wall of the outer medium pipe (701).
7. A compact plasma-co-catalytic organic waste gas treatment device according to claim 1,
the flow equalizing plug (101) is made of polytetrafluoroethylene materials, a circular boss is integrally connected to the surface of one side of the flow equalizing plug (101), the inner diameter of the boss of the flow equalizing plug (101) is 31-33 mm, the outer diameter of the boss of the flow equalizing plug (101) is 38mm, the outer peripheral wall of the boss of the flow equalizing plug (101) is tightly attached to the inner peripheral wall of one end of the outer medium pipe (701), and the inner peripheral wall of the boss of the flow equalizing plug (101) is tightly attached to the outer peripheral wall of one end of the inner medium pipe (501);
the air outlet holes (102) are circular through holes with the diameter of 1-2 mm, and the air outlet holes (102) are uniformly distributed on the surface of a boss of the flow equalizing plug (101);
a groove is formed in the boss of the flow equalizing plug (101);
the air inlets (103) are circular through holes with the diameter of 1-2 mm, and the air inlets (103) are uniformly distributed on the surface of the groove of the flow equalizing plug (101).
8. A compact plasma-co-catalytic organic waste gas treatment device according to claim 7,
the air inlet and outlet plug (301) is made of polytetrafluoroethylene materials, a circular boss is integrally connected to the surface of one side of the air inlet and outlet plug (301), and the size of the boss of the air inlet and outlet plug (301) is the same as that of the boss of the flow equalizing plug;
a groove is formed in the boss of the air inlet/outlet plug (301);
the air outlet (302) is arranged on the surface of a boss of the air inlet and outlet plug (301);
the air inlet (303) is arranged on the surface of the groove of the air inlet and outlet plug (301).
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| CN113545190B (en) * | 2021-07-26 | 2023-02-24 | 南京工业大学 | Low-temperature plasma soil nitrogen fixation device |
| CN113694701B (en) * | 2021-09-01 | 2022-05-13 | 南京工业大学 | CO for improving dielectric barrier discharge2Device and method for decomposing conversion performance |
| CN113828252A (en) * | 2021-09-22 | 2021-12-24 | 湖南大学 | Novel efficient reaction device for preparing ammonia by low-temperature plasma concerted catalysis |
| CN114733327B (en) * | 2022-04-19 | 2023-06-23 | 南京工业大学 | CO (carbon monoxide) 2 Integrated device for coupling decomposition and hydrogenation reaction |
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Application publication date: 20200612 Assignee: NJTECH ENVIRONMENT TECHNOLOGY Co.,Ltd. Assignor: Nanjing Tech University Contract record no.: X2023320000023 Denomination of invention: A compact plasma co-catalytic organic waste gas treatment device Granted publication date: 20211217 License type: Exclusive License Record date: 20230111 |