CN103785254B - A kind of processing method of painting dressing automobiles waste gas - Google Patents
A kind of processing method of painting dressing automobiles waste gas Download PDFInfo
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- CN103785254B CN103785254B CN201410056565.1A CN201410056565A CN103785254B CN 103785254 B CN103785254 B CN 103785254B CN 201410056565 A CN201410056565 A CN 201410056565A CN 103785254 B CN103785254 B CN 103785254B
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Abstract
The invention belongs to exhaust-gas treatment field, relate to a kind for the treatment of process of painting dressing automobiles waste gas.The present invention adopts spray washing to combine with photoelectric-synergetic low temperature plasma catalysis technique and processes the group technology of vehicle spray painting waste gas.Vehicle spray painting waste gas is introduced into spray scrubber pretreatment, and waste gas is fully contacted with water, and the water that coating cloud is wherein added into flocculant fully absorbs formation paint slag; Residue enters double-dielectric barrier discharge reactor after mixing a certain amount of oxygen containing organic waste gas, and its high-field electrode is support type photocatalysis material, utilizes plasma and photocatalysis Synergistic degradation organic matter.The inventive method is applicable to the purified treatment of vehicle spray painting tail gas of atm number, middle low concentration.The purification efficiency of the coating cloud after process can reach more than 95%, and its purification efficiency can reach more than 90%, meets " discharge standard of air pollutants " (GB16297 1996) secondary standard.
Description
Technical field
The invention belongs to exhaust-gas treatment field, relate to a kind of processing method of painting dressing automobiles waste gas.
Background technology
In automobile manufacturing process, application workshop section produces " three wastes " maximum link, wherein coating waste gas is the major part of application " three wastes ", especially the spraying paint of workpiece, levelling and oven dry, can produce a large amount of organic exhaust gas (VOC) and over-sprayed paint fog in these operations.Due to the reason such as the consciousness of people is inadequate, treatment technology is backward or processing cost is high, the often not treated direct discharge of these waste gas, has had a strong impact on the health of air quality and animal and plant growth and the mankind.The HJ/T293 " clean production standard auto manufacturing (application) " of China's just issuing and implementation as far back as 2006 specify that environmental management indicators, highlights the necessity of painting dressing automobiles exhaust-gas treatment.
At present, the normal method adopted mainly contains: condensation method, absorption method, absorption process, bioanalysis, Production by Catalytic Combustion Process, plasma technique etc.
Condensation method principle is simple, is remove and reclaim the good method of volatile organic matter, but will obtains the high rate of recovery, often need lower temperature or higher pressure, and energy consumption is large, is not " energy-saving and emission-reduction " truly; Absorption method is conventional and process foul gas, there is the advantages such as simple to operate, purification efficiency is high, technical matters is ripe, but the high-concentration waste gas that adsorbent heat air desorption produces needs to carry out after-treatment by combustion method more usually, and the liquid of generation easily produces secondary pollution, and operating cost is high; Absorption process process foul gas has certain effect, but poor for the mix waste gas applicability of complicated component, and easily causes secondary pollution; Biological deodorization has the advantages such as equipment is simple, energy consumption is low, the possibility of generation secondary pollution is little, but it is large to there is floor space, the shortcomings such as reactor start-up, microbial acclimation and processing procedure duration are longer; Production by Catalytic Combustion Process processes means more thoroughly, but operating cost is expensive, especially when the tar contained in waste gas, oil smoke, dust easily cause catalyst easily poisoning, is not suitable for the process of complicated spraying tail gas; Plasma technique is more novel treatment technology, and the moderate VOCs of process low concentration flow is very effective, but because energy efficiency is not high, poor selectivity and easily produce accessory substance, limit the industrial applications of this technology.Photocatalysis equipment operating is simple, but needs additional light source, and the easy in inactivation such as dust, oil smoke met by catalyst, causes transformation efficiency to decline.
Summary of the invention
The object of the invention is, for containing the problems such as painting dressing automobiles exhaust gas treatment technology efficiency is low, cost is high, fluctuation of service at present, to provide a kind of method can stablized, process painting dressing automobiles waste gas efficiently.
The object of this invention is to provide a kind of spray washing to combine with photoelectric-synergetic low temperature plasma catalysis technique and process the group technology of vehicle spray painting waste gas.Vehicle spray painting waste gas is introduced into spray scrubber pretreatment, and waste gas is fully contacted with water, and coating cloud wherein is fully absorbed by the water containing flocculant and forms paint slag, and the purification efficiency of coating cloud can reach more than 95%; Residue enters double-dielectric barrier discharge reactor (DDBD) after mixing a certain amount of oxygen containing organic waste gas, its high-field electrode is support type photocatalysis material, utilize plasma and photocatalysis synergy, the ultraviolet light that the high energy particle produced by plasma on the one hand excites with it drives photochemical catalyst to work in coordination with and directly degrades to organic pollution, produce a large amount of active particles, as O, OH, O on the other hand
3resolve into nontoxic compound further Deng to organic molecule, its purification efficiency can reach more than 90%.This group technology can reduce the defects such as the volume of equipment, the accessory substance of plasma generation and investment cost are high.Be applicable to the purified treatment of vehicle spray painting tail gas of atm number, middle low concentration.
Described vehicle spray painting waste gas main component is: coating cloud, toluene, dimethylbenzene, acetone, ethanol.
The sprinkle density preferably 1 ~ 4m of described spray scrubber
3/ (m
2, h).
One in described flocculant preferred polymeric aluminium chloride, bodied ferric sulfate, poly-ferric chloride; Described contains flocculant concentration preferably 1 ‰ ~ 5 ‰ (mass fractions) in the water of flocculant.
DDBD rating of set continuously adjustabe, power bracket is 1 ~ 3kw.
The support type photocatalysis high-field electrode of DDBD is preferred: TiO
2/ Ni, TiO
2/ Pt, SnO
2/ Ni, SnO
2one in/Pt, diameter is 0.1 ~ 0.4mm.
The preparation method of support type photocatalysis high-field electrode is: (1) takes a certain amount of sodium carboxymethylcellulose, joins in deionized water, heating, stirs until dissolve completely, makes the solution that mass concentration is 3%; (2) 5g nano-photocatalyst material (the i.e. TiO got is claimed
2, SnO
2in one), add 300ml in carboxymethylcellulose sodium solution; (3) be positioned on magnetic stirrer after ultrasonic 30min, stir 30min, stand-by.(4) wire electrode of 20cm is soaked in prepared 300ml photocatalysis solution, takes out after ultrasonic 15min, dry, namely obtain photocatalysis high-field electrode.
The amount of mixture of oxygen is 10% ~ 30%(V/V of coating waste gas total amount).
Exhaust emissions after process meets " discharge standard of air pollutants " (GB16297 ?1996) secondary standard.
Beneficial effect:
1, the present invention utilizes plasma directly to degrade to organic matter on the one hand, can generate O on the other hand
3deng oxidizing substance degradation of organic substances, in addition the ultraviolet light excited during plasma operation can drive photocatalysis under photochemical catalyst existent condition, realize Synergistic degradation, utilize oxygen distribution simultaneously, significantly can improve the density of oxidative free radical, multiple organic exhaust gas can be removed simultaneously, purification efficiency is high, degrade thorough, easy and simple to handle.
2, support type photocatalysis high-field electrode of the present invention have active high, the life-span is long.
3, the anti-load impact ability of apparatus of the present invention is strong, and operation stability is high, and non-secondary pollution.
Detailed description of the invention
The painting dressing automobiles waste gas main component of Nanjing automobile factory is: coating cloud 1100mg/m
3, toluene 370mg/m
3, dimethylbenzene 290mg/m
3, acetone 120mg/m
3, ethanol 180mg/m
3, tolerance is 2600m
3/ h.
Following examples carry out exhaust-gas treatment all by the following method:
Vehicle spray painting waste gas is introduced into spray scrubber pretreatment, and waste gas is fully contacted with the water containing flocculant of spray, and coating cloud wherein is fully absorbed by the water containing flocculant and forms paint slag; Residue enters double-dielectric barrier discharge reactor DDBD containing after organic waste gas mixture of oxygen, its electrode is support type photocatalysis high-field electrode, utilize plasma and photocatalysis concerted catalysis, the ultraviolet light that the high energy particle produced by plasma on the one hand excites with it drives that photochemical catalyst is collaborative directly degrades to organic pollution, and another aspect produces and a large amount of comprises O, OH, O
3at interior active particle, organic molecule is resolved into nontoxic compound further.
The carrying method of support type photocatalysis high-field electrode is: (1) takes a certain amount of sodium carboxymethylcellulose, joins in deionized water, heating, stirs until dissolve completely, makes the solution that mass concentration is 3%; (2) 5g nano-photocatalyst material (the i.e. TiO got is claimed
2, SnO
2in one), add 300ml in carboxymethylcellulose sodium solution; (3) be positioned on magnetic stirrer after ultrasonic 30min, stir 30min, stand-by.(4) wire electrode of 20cm is soaked in prepared 300ml photocatalysis solution, takes out after ultrasonic 15min, dry, namely obtain support type photocatalysis high-field electrode.
Embodiment 1
The sprinkle density 1m of spray scrubber
3/ (m
2, h), wherein flocculant is aluminium polychloride, and concentration is 5 ‰ (mass fractions); DDBD device preferred support type photocatalysis high-field electrode is TiO
2/ Ni, diameter is 0.3mm, and power is 3kw; The amount of mixture of oxygen is the 15%(V/V of waste gas total amount).
Coating cloud 45mg/m after process
3, toluene 20mg/m
3, dimethylbenzene 32mg/m
3, acetone 10mg/m
3, ethanol 12mg/m
3.Aiutage height is 15m, and discharge meets " discharge standard of air pollutants " (GB16297 ?1996) secondary standard.
Embodiment 2
The sprinkle density 2m of spray scrubber
3/ (m
2, h), wherein flocculant is bodied ferric sulfate, and concentration is 3 ‰ (mass fractions); DDBD device preferred support type photocatalysis high-field electrode is TiO
2/ Pt, diameter is 0.1mm, and power is 1kw; The amount of mixture of oxygen is the 10%(V/V of waste gas total amount).
Coating cloud 40mg/m after process
3, toluene 28mg/m
3, dimethylbenzene 30mg/m
3, acetone 11mg/m
3, ethanol 10mg/m
3.Aiutage height is 15m, and discharge meets " discharge standard of air pollutants " (GB16297 ?1996) secondary standard.
Embodiment 3
The sprinkle density 3m of spray scrubber
3/ (m
2, h), wherein flocculant is poly-ferric chloride, and concentration is 1 ‰ (mass fractions); DDBD device preferred support type photocatalysis high-field electrode is SnO/Ni, and diameter is 0.4mm, and power is 2kw; The amount of mixture of oxygen is the 30%(V/V of waste gas total amount).
Coating cloud 38mg/m after process
3, toluene 23mg/m
3, dimethylbenzene 28mg/m
3, acetone 8mg/m
3, ethanol 10mg/m
3.Aiutage height is 15m, and discharge meets " discharge standard of air pollutants " (GB16297 ?1996) secondary standard.
Embodiment 4
The sprinkle density 4m of spray scrubber
3/ (m
2, h), wherein flocculant is aluminium polychloride, and concentration is 5 ‰ (mass fractions); DDBD device preferred support type photocatalysis high-field electrode is the one in SnO/Pt, and diameter is 0.2mm, and power is 3kw; The amount of mixture of oxygen is the 20%(V/V of waste gas total amount).
Coating cloud 30mg/m after process
3, toluene 24mg/m
3, dimethylbenzene 35mg/m
3, acetone 11mg/m
3, ethanol 15mg/m
3.Aiutage height is 15m, and discharge meets " discharge standard of air pollutants " (GB16297 ?1996) secondary standard.
Claims (7)
1. a processing method for painting dressing automobiles waste gas, is characterized in that vehicle spray painting waste gas is introduced into spray scrubber pretreatment, and waste gas is fully contacted with the water containing flocculant of spray, and coating cloud wherein is fully absorbed by the water containing flocculant and forms paint slag; Residue enters double-dielectric barrier discharge reactor DDBD containing after organic waste gas mixture of oxygen, its electrode is support type photocatalysis high-field electrode, plasma and photocatalysis synergy is utilized to realize two catalysis, the ultraviolet light that the high energy particle produced by plasma on the one hand excites with it drives that photochemical catalyst is collaborative directly degrades to organic pollution, and another aspect produces and a large amount of comprises O, OH, O
3at interior active particle, organic molecule is resolved into nontoxic compound further; Described support type photocatalysis high-field electrode is prepared by the following method: (1) takes sodium carboxymethylcellulose and is dissolved in deionized water and makes the solution that mass concentration is 2 ~ 8%; (2) nano-photocatalyst material taken, add in the carboxymethylcellulose sodium solution of preparation, nano-photocatalyst material is selected from TiO
2, SnO
2in one, the mass volume ratio of nano-photocatalyst material and carboxymethylcellulose sodium solution is 1g:(50 ~ 70) ml; (3) be positioned on magnetic stirrer after ultrasonic 20 ~ 30min, stir 20 ~ 30min, stand-by; (4) wire electrode of 20cm is soaked in prepared photocatalysis solution, takes out after ultrasonic 15 ~ 20min, dry, namely obtain support type photocatalysis high-field electrode.
2. method according to claim 1, is characterized in that described vehicle spray painting waste gas main component is: coating cloud, toluene, dimethylbenzene, acetone and ethanol.
3. method according to claim 1, is characterized in that described flocculant is the one in aluminium polychloride, bodied ferric sulfate, poly-ferric chloride, and described is 1wt ‰ ~ 5wt ‰ containing the concentration of flocculant in the water of flocculant.
4. method according to claim 3, is characterized in that the sprinkle density of described spray scrubber is 1 ~ 4m
3/ (m
2, h).
5. method according to claim 1, it is characterized in that described double-dielectric barrier discharge reactor DDBD power continuously adjustabe, power bracket is 1 ~ 3kw.
6. method according to claim 1, is characterized in that described support type photocatalysis high-field electrode is selected from: TiO
2/ Ni, TiO
2/ Pt, SnO
2/ Ni, SnO
2any one in/Pt; The diameter of electrode is 0.1 ~ 0.4 mm.
7. method according to claim 1, is characterized in that the amount of described oxygen is 10% ~ 30%(V/V of vehicle spray painting waste gas total amount).
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| CN103785254B true CN103785254B (en) | 2015-10-28 |
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| CN104307275B (en) * | 2014-09-26 | 2016-08-17 | 黄欢 | Activated water is utilized to purify method and the air cleaner thereof of air |
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| CN105854584A (en) * | 2015-09-16 | 2016-08-17 | 中国科学院上海应用物理研究所 | Chlorobenzene waste gas processing method |
| CN106563343A (en) * | 2015-10-10 | 2017-04-19 | 余姚市婉珍五金厂 | Method for purifying and treating spray paint waste gas |
| CN106563342A (en) * | 2015-10-10 | 2017-04-19 | 余姚市婉珍五金厂 | Paint spraying table waste gas treatment method |
| CN105944505A (en) * | 2016-06-08 | 2016-09-21 | 廖张洁 | Composition for absorbing residual harmful substances in decorative materials |
| CN106277545A (en) * | 2016-09-30 | 2017-01-04 | 成都信息工程大学 | A kind of method of circulated sprinkling photocatalyst Cement Composite Treated by Plasma painting wastewater |
| CN107029526A (en) * | 2017-05-03 | 2017-08-11 | 南京工大环境科技有限公司 | A kind of incineration tail gas denitration advanced treatment process integrated with Tuo bioxin |
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| CN110327749A (en) * | 2019-07-18 | 2019-10-15 | 重庆工商大学 | A kind of method of low-temperature plasma degradation dimethylbenzene and synchronous fixed nitrogen |
| CN111437719B (en) * | 2020-03-13 | 2022-07-22 | 苏州金垚淼环境科技有限公司 | Device for degrading VOCs (volatile organic compounds) by low-temperature plasma in cooperation with catalysis |
| CN112902200A (en) * | 2021-01-28 | 2021-06-04 | 南京工大环境科技有限公司 | Heat storage incineration RTO treatment process for tail gas produced by ammonia oxidation process |
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