CN101274213A - Device for treating exhaust air in combination of dielectric barrier discharge plasma oxidation/solution absorption and method - Google Patents
Device for treating exhaust air in combination of dielectric barrier discharge plasma oxidation/solution absorption and method Download PDFInfo
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Abstract
The invention relates to a device and a method used for combined exhaust gas disposal of dielectric barrier discharge plasma oxidation/ solution absorption. In the method, the exhaust gas sequentially passes through a plasma area generated by a dielectric barrier discharge electrode system (1) and a solution absorption area in a water storage container (5), thus achieving the object of exhaust gas disposal. In the device, a power supply of the dielectric barrier discharge electrode system (1) is an AC high-voltage power supply which is provided with a high-voltage discharge electrode (6) and a low-voltage electrode (7); wherein, the high-voltage discharge electrode (6) is a metal rod electrode or a metal toroid electrode; the low-voltage electrode (7) is a cylindrical metal conductor which is sheathed on the external wall of an insulated medium pipe (8) or solution in the water storage container (5). The device and the method of the invention have the beneficial effects of simple principle, low technical difficulty, low cost, simple operation, high disposal efficiency, and generating no secondary pollution.
Description
Technical field
The invention belongs to environmental protection technical field, relate to the processing of gas pollutant, relate in particular to the device and method that a kind of dielectric barrier discharge plasma oxidation/solution absorbs treating exhaust air in combination.
Background technology
Along with the fast development of World Economics, Human's production and life activity are to a large amount of waste gas of airborne release, comprising pernicious gases such as sour gas, various dust suspended particulate, VOCs.Therefore these discharge of harmful gases make air quality go from bad to worse, and have become the significant problem that influences human kind sustainable development, and it is significant to carry out the gas pollutant Processing Technology energetically.
At present, the method for improvement gas pollutant mainly contains two kinds: a kind of is traditional administration way, comprises absorption process, absorption method, firing method, condensation method etc.; Another kind is an improvement technology newly developed, comprises biological treating technology and lower temperature plasma technology etc.
Though absorption process absorption efficiency height, simple, the disposable input expense of equipment are low, this method need be handled the liquid after absorbing, and equipment is perishable, and only limits to the treatment of waste gas that commute is absorbed by solution; Shortcoming such as that other traditional administration way such as absorption method, firing method and condensation method also exists is low such as treatment effeciency, secondary pollution is big and range of application is little.So many in recent years improvement technology newly developed are suggested, wherein lower temperature plasma technology is applied in the processing of gas pollutant as a kind of high efficiency, low energy consumption, environment protection novel simple to operate.
Dielectric barrier discharge can produce low temperature plasma under normal temperature and pressure conditions, the materials such as high energy electron, ion and molecule that contain the height reactivity in the plasma, react with various organic and inorganic gas pollutant molecules, can the easy to handle compound and be removed thereby make contaminant molecule resolve into micromolecular compound or be oxidized to; Dielectric barrier discharge has physical process and chemical processes such as special light, heat, sound, electricity in addition.
Summary of the invention
The purpose of this invention is to provide the device and method that a kind of dielectric barrier discharge plasma oxidation/solution absorbs treating exhaust air in combination, it has, and principle is simple, technical difficulty is little, cost is low, simple to operate, treatment effeciency is high, do not produce advantage such as secondary pollution.
In order to achieve the above object, technical scheme of the present invention is as follows:
Dielectric barrier discharge plasma oxidation/solution absorbs the device for the treatment of exhaust air in combination, mainly form by dielectric barrier discharge electrode system 1, high voltage source 2, air blast 3, micro porous aeration head 4 and water container 5, water container 5 is for being provided with the seal case of gas outlet 10, dielectric barrier discharge electrode system 1 mainly is made up of high-voltage discharging electrode 6, low-field electrode 7 and insulated dielectric tube 8, and insulated dielectric tube 8 is provided with air inlet 9; Dielectric barrier discharge electrode system 1 is positioned in the water container 5, and the output of high voltage source 2 and high-voltage discharging electrode 6 link, and the earth terminal of the input of high voltage source 2 and low-field electrode 7 links, and ground connection together; Air blast 3 links to each other with air inlet 9 by pipeline, and micro porous aeration head 4 directly or by junction pipe links to each other with insulated dielectric tube 8 lower ends, and is positioned in the solution of water container 5.
The insulated dielectric tube 8 of dielectric barrier discharge electrode system 1 is long for 10cm～1000cm, internal diameter are that 1cm～250cm, wall thickness are the column type pipe of 0.05cm～10cm, adopts insulating materials such as quartz, pottery, mica or polytetrafluoroethylene (PTFE) to make; High-voltage discharging electrode 6 is the long metallic rod of 8cm～800cm, diameter 0.1cm～200cm that are, be positioned over the axis place of insulated dielectric tube 8, can adopt screw rod, rib bar or smooth round bar, also can be to be that the height of the wire coiled of 0.01cm～1cm is the torus of 8cm～800cm, place in the insulated dielectric tube 8 by diameter; Low-field electrode 7 is metallic conductors of drum, tightly is enclosed within the outer wall of insulated dielectric tube 8, and height is 8cm～800cm, and internal diameter is 1.05cm～260cm, and low-field electrode 7 also can be the solution in the water container 5, by ground lead solution and ground wire is linked.
The present invention handles the method for waste gas, be that dielectric barrier discharge plasma oxidation technology and existing solution absorption method are combined, allow waste gas pass through from the plasma slab of dielectric barrier discharge electrode system 1 generation and the solution uptake zone the water container 5 in succession, thereby reach the purpose of handling waste gas.Its basic handling principle is: when pending waste gas passes through the plasma slab of dielectric barrier discharge electrode system 1 generation, chemical reaction takes place in the active specy that produces with dielectric barrier discharge in gas phase, generate water, carbon dioxide or some intermediate products, the waste gas of thoroughly not handled and these intermediate product parts are absorbed by solution, ozone in another part continuation and the liquid phase or the reaction of other active material, generate the avirulence material, thereby realize thorough processing waste gas.
Above-mentioned dielectric barrier discharge plasma oxidation/solution absorbs the method for the treatment of exhaust air in combination, comprises the steps: to utilize air blast 3 waste gas to be blasted in the insulated dielectric tube 8 of dielectric barrier discharge electrode system 1; In water container 5, inject solution; Open switch by high voltage source 2 work, crest voltage is 1～± 100kV, frequency is 50Hz～1MHz, make 1 discharge of dielectric barrier discharge electrode system, waste gas passes through from the plasma slab of dielectric barrier discharge electrode system 1 generation and the solution uptake zone the water container 5 in succession, thoroughly handled, gas is after treatment discharged by gas outlet 10.
The invention has the beneficial effects as follows: principle is simple, and technical difficulty is little, and cost is low, and is simple to operate, and the treatment effeciency height does not produce secondary pollution.
Description of drawings
Fig. 1 is the device schematic diagram that dielectric barrier discharge plasma oxidation/solution of the present invention absorbs treating exhaust air in combination.
Fig. 2 is the schematic diagram of high-voltage discharging electrode structure of the present invention.
Fig. 3 is the schematic diagram of the another kind of structure of high-voltage discharging electrode of the present invention.
Fig. 4 is the front view of dielectric barrier discharge electrode system of the present invention.
Among the figure: 1, dielectric barrier discharge electrode system, 2, high voltage source, 3, air blast, 4, micro porous aeration head, 5, water container, 6, high-voltage discharging electrode, 7, low-field electrode, 8, insulated dielectric tube, 9, air inlet, 10, the gas outlet.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done description in further detail:
As shown in Figures 1 to 4, dielectric barrier discharge plasma oxidation/solution absorbs the device for the treatment of exhaust air in combination and mainly is made up of dielectric barrier discharge electrode system 1, high voltage source 2, air blast 3, micro porous aeration head 4 and water container 5, water container 5 is for being provided with the seal case of gas outlet 10, dielectric barrier discharge electrode system 1 mainly is made up of high-voltage discharging electrode 6, low-field electrode 7 and insulated dielectric tube 8, and insulated dielectric tube 8 is provided with air inlet 9.
In the present embodiment, water container 5 is that the long 60cm of being, internal diameter are that 10cm, wall thickness are the column type lucite tube of 1cm; Insulated dielectric tube 8 is that the long 40cm of being, internal diameter are that 2cm, thickness are the column type quartz glass tube of 0.2cm; High-voltage discharging electrode 6 adopts stainless threaded rod electrode, and long is 35cm, and diameter is 0.5cm; Low-field electrode 7 is to be 25cm, widely to be 8cm, the thick column type net tube that surrounds for the square type stainless steel and iron net of 0.05cm by length, is enclosed within the outer wall of insulated dielectric tube 8; High voltage source 2 adopts 50Hz industrial frequency AC high voltage source; The aeration head that micro porous aeration head 4 adopts quartz sand to make.
Choose butyl acetate as the target handled thing, as the waste gas carrier gas, the gas flow that enters air blast 3 is 2000mL/min with nitrogen, the about 500ppm of the initial concentration of simulated exhaust, and liquid is the water of 1000ml in the water container 5.
The job step that dielectric barrier discharge plasma oxidation/solution absorbs the treating exhaust air in combination method is:
The first step, by air blast 3 with in the insulated dielectric tube 8 of simulated exhaust from air inlet 9 drum to dielectric barrier discharge electrode system 1;
In second step, in water container 5, inject 1000ml water;
The 3rd step, open high voltage source 2 switches, make 1 discharge of dielectric barrier discharge electrode system, waste gas is handled;
The 4th step, the exhaust gas concentration of measurement air inlet 9 and gas outlet 10, and computing efficient.
Experiment showed, when the crest voltage of high voltage source output is 13kV, treatment of waste gas efficient is reached 90%.
The present invention can be applied to the SO that produces in single or multiple mixing organic exhaust gas and the industry widely
2, NOx, H
2In the processing of inorganic waste gases such as S; This method also can be used as the chemical treatment method of waste gas and the pre-treatment process of bioremediation in addition.
Claims (8)
1, dielectric barrier discharge plasma oxidation/solution absorbs the device for the treatment of exhaust air in combination, it is characterized in that, this device mainly is made up of dielectric barrier discharge electrode system (1), high voltage source (2), air blast (3), micro porous aeration head (4) and water container (5), water container (5) is for being provided with the seal case of gas outlet (10), dielectric barrier discharge electrode system (1) mainly is made up of high-voltage discharging electrode (6), low-field electrode (7) and insulated dielectric tube (8), and insulated dielectric tube (8) is provided with air inlet (9); Dielectric barrier discharge electrode system (1) is positioned in the water container (5), and the output of high voltage source (2) and high-voltage discharging electrode (6) link, and the earth terminal of the input of high voltage source (2) and low-field electrode (7) links, and ground connection together; Air blast (3) links to each other with air inlet (9) by pipeline, and micro porous aeration head (4) directly or by junction pipe links to each other with insulated dielectric tube (8) lower end, and is positioned in the solution of water container (5).
2, dielectric barrier discharge plasma oxidation/solution as claimed in claim 1 absorbs the device for the treatment of exhaust air in combination, it is characterized in that described insulated dielectric tube (8) is that the long 10cm～1000cm of being, internal diameter are that 1cm～250cm, wall thickness are the column type pipe of 0.05cm～10cm.
3, dielectric barrier discharge plasma oxidation/solution as claimed in claim 1 or 2 absorbs the device for the treatment of exhaust air in combination, it is characterized in that, described insulated dielectric tube (8) is made by quartz or pottery or mica or polytetrafluoroethylmaterial material.
4, dielectric barrier discharge plasma oxidation/solution as claimed in claim 1 absorbs the device for the treatment of exhaust air in combination, it is characterized in that, described high-voltage discharging electrode (6) is the metallic rod of screw-like, rib type shape or smooth type, be positioned over the axis place of insulated dielectric tube (8), long is 8cm～800cm, diameter 0.1cm～200cm.
5, dielectric barrier discharge plasma oxidation/solution as claimed in claim 1 absorbs the device for the treatment of exhaust air in combination, it is characterized in that, described high-voltage discharging electrode (6) is the torus of wire coiled, be positioned over the inwall place of insulated dielectric tube (8), wire diameter is 0.01～1cm, and the torus height is 8～800cm.
6, dielectric barrier discharge plasma oxidation/solution as claimed in claim 1 absorbs the device for the treatment of exhaust air in combination, it is characterized in that described low-field electrode (7) is the metallic conductor of drum, tightly is enclosed within the outer wall of insulated dielectric tube (8).
7, dielectric barrier discharge plasma oxidation/solution as claimed in claim 1 absorbs the device for the treatment of exhaust air in combination, it is characterized in that described low-field electrode (7) is the solution in the water container (5).
8, dielectric barrier discharge plasma oxidation/solution absorbs the method for the treatment of exhaust air in combination, it is characterized in that this method comprises the steps: to utilize air blast (3) waste gas to be blasted in the insulated dielectric tube (8) of dielectric barrier discharge electrode system (1); In water container (5), inject solution; Opening switch works by high voltage source (2), crest voltage is 1～± 100kV, frequency is 50Hz～1MHz, make dielectric barrier discharge electrode system (1) discharge, waste gas passes through from the plasma slab of dielectric barrier discharge electrode system (1) generation and the solution uptake zone the water container (5) in succession, thoroughly handled, gas is after treatment discharged by gas outlet (10).
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| CNA2007101593381A CN101274213A (en) | 2007-12-29 | 2007-12-29 | Device for treating exhaust air in combination of dielectric barrier discharge plasma oxidation/solution absorption and method |
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| CNA2007101593381A CN101274213A (en) | 2007-12-29 | 2007-12-29 | Device for treating exhaust air in combination of dielectric barrier discharge plasma oxidation/solution absorption and method |
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| CN101434428B (en) * | 2008-12-03 | 2011-06-15 | 大连理工大学 | Liquid electrode surface discharge plasma reactor for water treatment |
| CN102397743A (en) * | 2010-09-16 | 2012-04-04 | 中国环境科学研究院 | Apparatus and method used for reducing CO2 by using dielectric barrier discharge plasma combined with biomass |
| CN103111167A (en) * | 2013-02-04 | 2013-05-22 | 韩汶冀 | High-voltage plasma purifier |
| CN103480261A (en) * | 2013-09-30 | 2014-01-01 | 浙江大学 | Integrated purification device for gaseous pollutants |
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