CN105289297A - Plasma reaction device and method for treating organic waste gases - Google Patents
Plasma reaction device and method for treating organic waste gases Download PDFInfo
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- CN105289297A CN105289297A CN201510897225.6A CN201510897225A CN105289297A CN 105289297 A CN105289297 A CN 105289297A CN 201510897225 A CN201510897225 A CN 201510897225A CN 105289297 A CN105289297 A CN 105289297A
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- plasma reaction
- sparking electrode
- exhaust gas
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Abstract
The invention discloses a plasma reaction device and a plasma reaction method for treating organic waste gases. The reaction device comprises a quartz tube body provided with an air inlet and an air outlet, wherein a grounded copper electrode is arranged on the outer wall of the quartz tube body. The reaction device also comprises a discharge electrode and multiple ultraviolet lamps, wherein the discharge electrode is arranged at the axis of the quartz tube body and is externally connected with a high voltage power supply; the surface of the discharge electrode is coated with a photocatalytic material with response of ultraviolet light so as to serve as a medium; and the ultraviolet lamps are arranged around a photocatalytic electrode. According to the device and method disclosed by the invention, plasma and high-energy electrons and other various free radicals generated in the photocatalysis process are utilized, organic waste gas molecules are oxidized into carbon dioxide and water, a TiO2 catalyst is arranged on the discharge electrode, aerosol can be effectively inhibited to be deposited on the electrode, and an electrode self-cleaning effect is achieved.
Description
Technical field
The present invention relates to atmosphere pollution control technology field, particularly relate to a kind of automatically cleaning electrode plasma reaction unit and method of administering organic exhaust gas.
Background technology
Lower temperature plasma technology process organic exhaust gas is new type purification method.Low temperature plasma is considered to the 4th kind of existing forms (except solid-state, liquid and gaseous state) of material, the conducting fluid be made up of electronics, ion, neutral particle and free radical.Low temperature plasma can be produced in the processes such as DC corona discharge, corona discharge pulse, dielectric barrier discharge by gas.Organic exhaust gas can be degraded into CO by the high energy electron that low temperature plasma comprises, hydroxyl radical free radical, the acting in conjunction of oxygen atom isoreactivity particle
2, H
2o and other products.
Such as, Authorization Notice No. is that the Chinese utility model patent of CN202231939U discloses a kind of plasma reactor.This plasma reactor, comprise: upper electrode, lower electrode and power supply, described lower electrode is connected with described power supply, forms plasma reaction chamber between described upper electrode and described lower electrode, and described upper electrode is the curved body of middle part evagination.
Authorization Notice No. is that the Chinese utility model patent of CN202246850U discloses a kind of plasma reactor, it comprises vacuum tank, to the air inlet device of described vacuum tank, the plasma device of plasma is produced in described vacuum tank, substrate holder in described vacuum tank and exhaust apparatus, the wall of the contiguous described vacuum tank of described exhaust apparatus is used for gas is removed from described vacuum tank, and described exhaust apparatus and described air inlet device and with described substrate holder from a distance, described exhaust apparatus comprises at least one outlet through described wall and at least one airflow redirector body, its be designed for make by the described gas flow that removes from described vacuum tank at least partially in the front steering entering described outlet.
The experimental study of many scholars and demonstration project show that lower temperature plasma technology process VOCs has the advantages such as applied widely, one-time investment cost is low, capacity usage ratio is high, plant maintenance is simple, expense is low.
But wherein still there are two key issues and govern promoting the use of of this technology always on a large scale:
1) clearance is low: " key area prevention and control of air pollution " 12 " planning " regulation every profession and trade need carry out VOCs control, and purifying rate is not less than 90%.Low Temperature Plasma Treating easily degrade VOCs waste gas (as methyl sulfide, ethyl mercaptan, dimethylamine etc.) time clearance high, can more than 95% be reached.But process arene VOCs (as benzene,toluene,xylene etc.) clearance, between 50%-70%, does not reach the purification requirement of " key area prevention and control of air pollution " 12 " planning ".
2) there is potential safety hazard: low temperature plasma removes organic exhaust gas demonstration project once breaking out of fire and explosion accident.Casualty investigation findings and correlative study show, low temperature plasma part organic exhaust gas molecule in removal organic exhaust gas process is not exclusively degraded and assembled symphysis and become aerosol.Aerosol, by free settling and electrostatic adsorption, easily accumulates in discharge electrode surface.Discharge electrode is cleared up maintenance not in time and will be caused equipment to discharge exception, and as spark discharge, may cause ignites accumulates in secondary pollution on electrode, thus causes fire or explosion accident.
Summary of the invention
The invention provides a kind of plasma reaction device and method of administering organic exhaust gas, the high energy electron utilizing plasma and photocatalytic process to produce and other various free radicals, change into carbon dioxide and water by organic exhaust gas molecular oxygen, discharge electrode arrange TiO
2catalyst, can effectively suppress aerosol deposition on electrode, have electrode self-cleaning effect.
Administer a plasma reaction device for organic exhaust gas, comprise the quartzy body with air inlet and gas outlet, described quartzy tube wall arranges the copper electrode of ground connection,
Also comprise:
Be arranged at described quartzy body axle center place and the sparking electrode of external high voltage power supply, the catalysis material of the surface coating response ultraviolet light of this sparking electrode is as medium;
And around some uviol lamps that described photochemical catalyst electrode is arranged.
Photocatalysis and plasma effectively combine by the present invention, greatly improve the clearance of organic exhaust gas.The low temperature plasma that superoxide anion, hydroxyl radical free radical isoreactivity particle and dielectric barrier discharge that a large amount of photocatalysis of sparking electrode surface aggregation produces produce, can be oxidized to CO by the aerosol of discharge electrode surface contact in time
2and H
2o etc., thus avoid discharge electrode secondary pollution to gather in a large number.In addition, the present invention's research shows to add photochemical catalyst in low temperature plasma environment, can strengthen CO when VOCs degrades
2selective, reduce aerosol generate.
This patent adopts photochemical catalyst electrode dielectric barrier discharge to produce low temperature plasma, by low-temperature plasma synergistic photocatalysis, improves voc_s removal rate, suppresses discharge electrode aerosol to gather simultaneously, eliminates safe hidden trouble.
Catalysis material in the present invention on sparking electrode can be the common any one visible light responsible photocatalytic material in this area, and in the present invention preferably, described catalysis material is TiO
2.
Sparking electrode of the present invention is photochemical catalyst electrode, and this photochemical catalyst electrode itself can directly adopt photochemical catalyst electrode well known in the art and preparation method, and in the present invention preferably, described sparking electrode is by load TiO
2sintered metal fiber be prepared from.Load TiO
2the photochemical catalyst electrode that is prepared from of sintered metal fiber be connected with external high voltage source with high-voltage conducting wires.
Further preferably, described sintered metal fiber is nichrome fiber, has 3D reticulated porous structures, and comprise the mesoporous of 2-50nm and be greater than 50 and be less than the macropore of 100nm, porosity is 80-90%.
Preferably, described quartzy body two ends by the holder end-blocking that insulate, with the draw-in groove in order to fixing sparking electrode and uviol lamp on described insulation holder.Described insulation holder is teflon insulation holder, and sparking electrode and all uviol lamps are installed on this insulation holder.
Preferably, the setting of described uviol lamp centered by sparking electrode uniform ring around outside sparking electrode.
Further preferably, the spacing between uviol lamp and sparking electrode is 5mm ~ 10mm.
Further, the magnitude setting of uviol lamp is 2 ~ 4.
Further, described uviol lamp release wavelength 254nm ultraviolet light.
Uviol lamp is as the light source of photocatalysis medium, and its optimization arranging Distance geometry density of setting can improve photocatalysis efficiency, reduces aerocolloidal generation further.
Preferably, the length of described quartzy body is 180mm ~ 250mm, and internal diameter is 20 ~ 40mm, and the diameter of sparking electrode is 1mm ~ 2mm.The wall thickness of quartz body is 3-5mm.
Most preferably, the length of described quartzy body is 200mm, and internal diameter is 24mm, and the diameter of sparking electrode is 1.5mm.
The present invention also provides a kind of method utilizing described plasma reaction device process organic exhaust gas, organic exhaust gas is comprised the steps: to pass in quartzy body from air inlet, sparking electrode access high voltage source, copper electrode ground connection, ultra violet lamp sparking electrode, carry out purified treatment to organic exhaust gas, after purification, gas is discharged by gas outlet.
Preferably, the voltage of described high voltage source is 30 ~ 100kV, and the power of described uviol lamp is 150w ~ 200w; Time of staying 1s ~ the 5s of described organic exhaust gas in quartzy body.
Further preferably, the voltage of described high voltage source is 40kV, and the power of described uviol lamp is 150w; The time of staying 4s of described organic exhaust gas in quartzy body.
Organic pollution in described organic exhaust gas is toluene, dimethylbenzene etc.
Compared with prior art, the present invention has following advantage:
The present invention has higher clearance than conventional plasma reactor according to organic exhaust gas under same consumption energy.Arranging of photochemical catalyst electrode can avoid organic exhaust gas decomposable process form aerosol and be deposited on electrode, reduces potential safety hazard.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention;
Fig. 2 a and Fig. 2 b is that ((a) is load TiO to photochemical catalyst electrode electron-microscope scanning figure (5000 ×)
2before; B () is load TiO
2afterwards);
The degraded situation map of Fig. 3 toluene in various reactor;
Fig. 4 Different electrodes in long-play to the degraded situation map of toluene;
In figure: 1-quartz body; 2-sparking electrode; 3-copper electrode; 4-uviol lamp; 5-insulate holder; 6-air inlet; 7-gas outlet.
Detailed description of the invention
As shown in Figure 1, a kind of plasma reactor, comprise quartzy body 1, the two ends of quartzy body 1 are by holder 5 end-blocking that insulate, and insulation holder is that polytetrafluoroethylene (PTFE) is made, with draw-in groove on insulation holder, quartzy body one end also close corresponding insulation holder place is provided with air inlet 6, and the quartzy body other end is provided with gas outlet 7 in holder place and close correspondence insulate, and quartzy body 1 outer wall arranges copper electrode 3, it is external that copper sheet is coated on quartz ampoule, ground connection.
The axle center place of quartz body 1 arranges sparking electrode 2, and sparking electrode 2 is photochemical catalyst electrode, load TiO
2sintered metal fiber (SMF) be prepared from, photochemical catalyst electrode high-voltage conducting wires is connected with external high voltage source.In present embodiment, the composition of sintered metal fiber (SMF) is nichrome fiber, there is 3D reticulated porous structures, aperture is based on mesoporous (2-50nm) and macropore (> 50nm), porosity is 80-90%, and its electron-microscope scanning figure as shown in Figure 2.
Sparking electrode 2 peripheral ring is around uviol lamp 4, and uviol lamp release wavelength 254nm ultraviolet light, the spacing between uviol lamp and sparking electrode is 5mm ~ 10mm, and the magnitude setting of uviol lamp is 2 ~ 4.The two ends of sparking electrode and all uviol lamps are all fixed with the corresponding draw-in groove insulating holder.
The wall thickness 3-5mm of quartz body, length is 180mm ~ 250mm, and internal diameter is 20 ~ 40mm, and the diameter of sparking electrode is 1mm ~ 2mm.
Pass in quartzy body by organic exhaust gas from air inlet, sparking electrode access high voltage source, copper electrode ground connection, ultra violet lamp sparking electrode, carries out purified treatment to organic exhaust gas, and after purification, gas is discharged by gas outlet.
Embodiment 1
Adopt reactor degraded toluene waste gas as shown in Figure 1, the long 200mm of quartzy body, internal diameter 24mm, photochemical catalyst electrode diameter 1.5mm.The inlet concentration of toluene waste gas is 160mg/m3, and the time of staying is 4s.
The degraded situation of toluene waste gas in the reactor being configured with different discharge electrode as shown in Figure 3, as can be seen from the figure when uviol lamp is opened, has photochemical catalyst electrode (SMF+TiO
2+ UV) reactor will far above the reactor under other electrodes to the clearance of toluene.When input voltage is at 40kV, the clearance of toluene reaches more than 90%.
Fig. 4 has the removal result figure to toluene under the ordinary electrode reactor long-play under the plasma reactor (the present invention) of photochemical catalyst electrode and same size, can find out in Fig. 4, in the plasma reactor stable operation 25 days of photochemical catalyst electrode, the clearance of toluene is all more than 90%, and clearance is without obvious decline.And common response device is when just bringing into operation, toluene removal rate, about 61%, is run after 25 days, and clearance drops to 54%.Organic exhaust gas decomposable process can be avoided to form aerosol by arranging of the known photochemical catalyst electrode of the present invention of the result of Fig. 4 and be deposited on electrode, extending electrode life, reducing potential safety hazard.
The foregoing is only the concrete case study on implementation of patent of the present invention, but the technical characteristic of patent of the present invention is not limited thereto, any those skilled in the relevant art are in the field of the invention, and the change done or modification are all encompassed among the scope of the claims of the present invention.
Claims (10)
1. administer a plasma reaction device for organic exhaust gas, comprise the quartzy body with air inlet and gas outlet, described quartzy tube wall arranges the copper electrode of ground connection,
It is characterized in that, also comprise:
Be arranged at described quartzy body axle center place and the sparking electrode of external high voltage power supply, the catalysis material of the surface coating response ultraviolet light of this sparking electrode is as medium;
And around some uviol lamps that described photochemical catalyst electrode is arranged.
2. plasma reaction device according to claim 1, it is characterized in that, described sparking electrode is by load TiO
2sintered metal fiber be prepared from.
3. plasma reaction device according to claim 2, it is characterized in that, described sintered metal fiber is nichrome fiber, has 3D reticulated porous structures, and comprise the mesoporous of 2-50nm and be greater than 50 and be less than the macropore of 100nm, porosity is 80-90%.
4. plasma reaction device according to claim 1, is characterized in that, described quartzy body two ends by the holder end-blocking that insulate, with the draw-in groove in order to fixing sparking electrode and uviol lamp on described insulation holder.
5. plasma reaction device according to claim 1, is characterized in that, the setting of described uviol lamp centered by sparking electrode uniform ring around outside sparking electrode.
6. plasma reaction device according to claim 5, it is characterized in that, the spacing between uviol lamp and sparking electrode is 5mm ~ 10mm.
7. plasma reaction device according to claim 6, it is characterized in that, the magnitude setting of uviol lamp is 2 ~ 4.
8. plasma reaction device according to claim 1, it is characterized in that, the length of described quartzy body is 180mm ~ 250mm, and internal diameter is 20 ~ 40mm, and the diameter of sparking electrode is 1mm ~ 2mm.
9. one kind utilizes the method for plasma reaction device process organic exhaust gas described in claim 1, it is characterized in that, organic exhaust gas is comprised the steps: to pass in quartzy body from air inlet, sparking electrode access high voltage source, copper electrode ground connection, ultra violet lamp sparking electrode, carries out purified treatment to organic exhaust gas, and after purification, gas is discharged by gas outlet.
10. method according to claim 9, it is characterized in that, the voltage of described high voltage source is 30 ~ 100kV, and the power of described uviol lamp is 150w ~ 200w; Time of staying 1s ~ the 5s of described organic exhaust gas in quartzy body.
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| CN201510897225.6A CN105289297B (en) | 2015-12-08 | 2015-12-08 | A kind of plasma reaction device and method for administering organic exhaust gas |
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| CN201510897225.6A CN105289297B (en) | 2015-12-08 | 2015-12-08 | A kind of plasma reaction device and method for administering organic exhaust gas |
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Cited By (5)
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| CN107252627A (en) * | 2017-06-27 | 2017-10-17 | 中煤科工集团西安研究院有限公司 | A kind of VOCs handling process and equipment |
| CN108043217A (en) * | 2017-11-27 | 2018-05-18 | 浙江大学 | A kind of plasma couples photocatalysis apparatus in situ |
| CN114191950A (en) * | 2022-01-07 | 2022-03-18 | 河海大学 | Quick clearing device of plasma formaldehyde discharges |
| CN115111697A (en) * | 2022-06-10 | 2022-09-27 | 中物院成都科学技术发展中心 | Photoelectric coupling module, air purification device and method |
| CN115155304A (en) * | 2022-06-29 | 2022-10-11 | 浙江省标准化研究院(金砖国家标准化(浙江)研究中心、浙江省物品编码中心) | Plasma-photocatalytic peculiar smell elimination device and elimination method |
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| CN101835336A (en) * | 2010-05-21 | 2010-09-15 | 江苏大学 | Double-dielectric barrier discharge low-temperature plasma generator |
| CN102744077A (en) * | 2012-07-13 | 2012-10-24 | 浙江大学 | Preparation method of sintered metal fiber bundle catalyst, catalyst and device |
| CN103349890A (en) * | 2013-07-03 | 2013-10-16 | 大连理工大学 | Apparatus for removing indoor harmful gas based on nanosecond pulsed discharge technology |
| CN105032144A (en) * | 2015-08-10 | 2015-11-11 | 杭州科瑞特环境技术有限公司 | Double-medium barrier discharge organic waste gas treatment apparatus for embedded ultraviolet modulator tube and method thereof |
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| CN101835336A (en) * | 2010-05-21 | 2010-09-15 | 江苏大学 | Double-dielectric barrier discharge low-temperature plasma generator |
| CN102744077A (en) * | 2012-07-13 | 2012-10-24 | 浙江大学 | Preparation method of sintered metal fiber bundle catalyst, catalyst and device |
| CN103349890A (en) * | 2013-07-03 | 2013-10-16 | 大连理工大学 | Apparatus for removing indoor harmful gas based on nanosecond pulsed discharge technology |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107252627A (en) * | 2017-06-27 | 2017-10-17 | 中煤科工集团西安研究院有限公司 | A kind of VOCs handling process and equipment |
| CN108043217A (en) * | 2017-11-27 | 2018-05-18 | 浙江大学 | A kind of plasma couples photocatalysis apparatus in situ |
| CN108043217B (en) * | 2017-11-27 | 2020-06-19 | 浙江大学 | Plasma in-situ coupling photocatalysis device |
| CN114191950A (en) * | 2022-01-07 | 2022-03-18 | 河海大学 | Quick clearing device of plasma formaldehyde discharges |
| CN115111697A (en) * | 2022-06-10 | 2022-09-27 | 中物院成都科学技术发展中心 | Photoelectric coupling module, air purification device and method |
| CN115155304A (en) * | 2022-06-29 | 2022-10-11 | 浙江省标准化研究院(金砖国家标准化(浙江)研究中心、浙江省物品编码中心) | Plasma-photocatalytic peculiar smell elimination device and elimination method |
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| CN105289297B (en) | 2018-06-05 |
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