CN103785254A - Treatment method for automobile coating waste gas - Google Patents
Treatment method for automobile coating waste gas Download PDFInfo
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- CN103785254A CN103785254A CN201410056565.1A CN201410056565A CN103785254A CN 103785254 A CN103785254 A CN 103785254A CN 201410056565 A CN201410056565 A CN 201410056565A CN 103785254 A CN103785254 A CN 103785254A
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- waste gas
- automobile coating
- photocatalysis
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- coating waste
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Abstract
The invention belongs to the field of waste gas treatment and relates to a treatment technology for automobile coating waste gas. A combined technology consisting of spraying washing and a photoelectric synergic low-temperature plasma catalysis technology is adopted to treat the automobile coating waste gas. The automobile coating waste gas firstly enters a spraying washing tower for pretreatment, and the waste gas is in full contact with water; paint mists are fully absorbed by water with a flocculating agent to form paint resides; the rest of the waste gas containing organic matters is mixed with a certain amount of oxygen and then enters a double-dielectric barrier discharge reactor; a high-voltage electrode is a load type photocatalysis material; plasmas and photocatalysis are synergically used for degrading the organic matters. The method disclosed by the invention is suitable for purification treatment on a large amount of automobile coating waste gas with the low and medium concentration; the purification efficiency of the treated paint mists is up to over 95 percent; the purification efficiency is over 90 percent; the treated automobile coating waste gas meets the secondary standard of the Integrated Emission Standard of Air Pollutants (GB16297-1996).
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 people's consciousness is inadequate, treatment technology is backward or processing cost is high, the often not treated direct discharge of these waste gas, have a strong impact on air quality and animal and plant growth and the mankind's health.China's just HJ/T293 " cleaner production standard automobile manufacturing industry (application) " of issuing and implementation was clear and definite as far back as 2006 environmental management indicators, have emphasized the necessity of painting dressing automobiles exhaust-gas treatment.
At present, the normal method adopting mainly contains: condensation method, absorption method, absorption process, bioanalysis, Production by Catalytic Combustion Process, plasma technique etc.
Condensation method principle is simple, is to remove and reclaim the good method of volatile organic matter, but will obtains the high rate of recovery, and often need lower temperature or higher pressure, energy consumption is large, is not " energy-saving and emission-reduction " truly; Absorption method is commonly used and is processed 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 need to carry out after-treatment by combustion method conventionally again, and the liquid of generation easily produces secondary pollution, and operating cost is high; Absorption process is processed foul gas certain effect, but poor for the mix waste gas applicability of complicated component, and easily causes secondary pollution; The shortcomings such as biological deodorization has the advantages such as equipment is simple, energy consumption is low, the possibility of generation secondary pollution is little, but exists floor space large, and reactor start-up, microbial acclimation and processing procedure duration are long; Production by Catalytic Combustion Process is the means of processing more thoroughly, but operating cost costliness especially, when the tar, oil smoke, the dust that contain in waste gas easily cause catalyst easily poisoning, is not suitable for the processing of complicated spraying tail gas; Plasma technique is more novel treatment technology, processes the moderate VOCs of low concentration flow very effective, but because energy efficiency is not high, poor selectivity and easily produce accessory substance, limited the industrial applications of this technology.Photocatalysis equipment operating is simple, but needs additional light source, and catalyst is met the easily inactivation such as dust, oil smoke, causes transformation efficiency to decline.
Summary of the invention
The object of the invention is, for containing at present the problems such as painting dressing automobiles exhaust gas treatment technology efficiency is low, cost is high, fluctuation of service, provides a kind of method that can stablize, process efficiently painting dressing automobiles waste gas.
The object of this invention is to provide a kind of spray washing combines 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 coating cloud wherein is fully absorbed and forms paint slag containing the water of flocculant, and the purification efficiency of coating cloud can reach more than 95%; Remain to contain after organic waste gas mixes a certain amount of oxygen and enter double-dielectric barrier discharge reactor (DDBD), its high-field electrode is support type photocatalysis material, utilize plasma and photocatalysis synergy, the ultraviolet light being excited with it by the high energy particle of plasma generation on the one hand drives photochemical catalyst to work in coordination with organic pollution is directly degraded, produce on the other hand a large amount of active particles, as O, OH, O
3deng organic molecule further being resolved into nontoxic compound, its purification efficiency can reach more than 90%.This group technology can reduce the volume of equipment, the defect such as accessory substance and investment cost height of plasma generation.Be applicable to the purified treatment of the 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.
Preferably 1～4m of the sprinkle density of described spray scrubber
3/ (m
2, h).
One in described flocculant preferred polymeric aluminium chloride, bodied ferric sulfate, poly-ferric chloride; Described containing preferably 1 ‰～5 ‰ (mass fractions) of flocculant concentration in the water of flocculant.
DDBD rating of set is adjustable continuously, and 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, and heating, stirs until dissolve completely, makes mass concentration and be 3% solution; (2) nano-photocatalyst material that claims 5g to get (is TiO
2, SnO
2in one), add 300ml in carboxymethylcellulose sodium solution; (3) after ultrasonic 30min, be positioned on magnetic stirrer, stir 30min, stand-by.(4) wire electrode of 20cm is soaked in prepared 300ml photocatalysis solution, after ultrasonic 15min, takes out, dry, 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 treatment meets " discharge standard of air pollutants " (GB16297 ?1996) secondary standard.
Beneficial effect:
1, the present invention utilizes plasma on the one hand organic matter directly to be degraded, and can generate on the other hand O
3deng oxidizing substance degradation of organic substances, in addition under the condition that the ultraviolet light exciting when plasma is worked can exist at photochemical catalyst, drive photocatalysis, realize Synergistic degradation, utilize oxygen distribution simultaneously, can significantly improve the density of oxidative free radical, can remove multiple organic exhaust gas, purification efficiency is high, it is thorough, easy and simple to handle to degrade simultaneously.
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.
The specific embodiment
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 are all carried out exhaust-gas treatment 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 containing the water of flocculant forms paint slag; After containing organic waste gas mixture of oxygen, residue enters double-dielectric barrier discharge reactor DDBD, its electrode is support type photocatalysis high-field electrode, utilize plasma and photocatalysis concerted catalysis, the ultraviolet light being excited with it by the high energy particle of plasma generation on the one hand drives photochemical catalyst to work in coordination with organic pollution is directly degraded, and produces on the other hand a large amount of O, OH, O of comprising
3at interior active particle, organic molecule is further resolved into nontoxic compound.
The carrying method of support type photocatalysis high-field electrode is: (1) takes a certain amount of sodium carboxymethylcellulose, joins in deionized water, and heating, stirs until dissolve completely, makes mass concentration and be 3% solution; (2) nano-photocatalyst material that claims 5g to get (is TiO
2, SnO
2in one), add 300ml in carboxymethylcellulose sodium solution; (3) after ultrasonic 30min, be positioned on magnetic stirrer, stir 30min, stand-by.(4) wire electrode of 20cm is soaked in prepared 300ml photocatalysis solution, after ultrasonic 15min, takes out, dry, 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, concentration is 5 ‰ (mass fractions); The preferred support type photocatalysis of DDBD device high-field electrode is TiO
2/ Ni, diameter is 0.3mm, power is 3kw; The amount of mixture of oxygen is the 15%(V/V of waste gas total amount).
Coating cloud 45mg/m after treatment
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, concentration is 3 ‰ (mass fractions); The preferred support type photocatalysis of DDBD device high-field electrode is TiO
2/ Pt, diameter is 0.1mm, power is 1kw; The amount of mixture of oxygen is the 10%(V/V of waste gas total amount).
Coating cloud 40mg/m after treatment
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, concentration is 1 ‰ (mass fractions); The preferred support type photocatalysis of DDBD device 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 treatment
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, concentration is 5 ‰ (mass fractions); The preferred support type photocatalysis of DDBD device 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 treatment
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 (8)
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 containing the water of flocculant forms paint slag; After containing organic waste gas mixture of oxygen, residue enters double-dielectric barrier discharge reactor DDBD, its electrode is support type photocatalysis high-field electrode, utilize plasma and photocatalysis synergy to realize two catalysis, the ultraviolet light being excited with it by the high energy particle of plasma generation on the one hand drives photochemical catalyst to work in coordination with organic pollution is directly degraded, and produces on the other hand a large amount of O, OH, O of comprising
3at interior active particle, organic molecule is further resolved into nontoxic compound.
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 the described concentration containing flocculant in the water of flocculant is 1wt ‰～5wt ‰.
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, is characterized in that described double-dielectric barrier discharge reactor DDBD power is adjustable continuously, and 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 0.1～0.4mm.
7. method according to claim 1, is characterized in that described support type photocatalysis high-field electrode prepared by the following method: (1) takes sodium carboxymethylcellulose and is dissolved in that in deionized water, to make mass concentration be 2～8% solution; (2) nano-photocatalyst material taking, adds in the carboxymethylcellulose sodium solution of preparation, and 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) after ultrasonic 20～30min, be positioned on magnetic stirrer, stir 20～30min, stand-by.(4) wire electrode of 20cm is soaked in prepared photocatalysis solution, after ultrasonic 15～20min, takes out, dry, obtain support type photocatalysis high-field electrode.
8. 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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|---|---|---|---|
| CN201410056565.1A CN103785254B (en) | 2014-02-19 | 2014-02-19 | A kind of processing method of painting dressing automobiles waste gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104307275A (en) * | 2014-09-26 | 2015-01-28 | 黄欢 | Method for purifying air by utilization of activated water and air cleaning unit |
| CN105214424A (en) * | 2015-09-11 | 2016-01-06 | 宜兴市天马环保工程有限公司 | Tobacco leaf production technology of deodorization |
| 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 |
| CN106540528A (en) * | 2015-09-16 | 2017-03-29 | 中国科学院上海应用物理研究所 | A kind of processing method of chlorobenzene 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 |
| 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 |
| 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 |
| CN111437719A (en) * | 2020-03-13 | 2020-07-24 | 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 |
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| CN104307275A (en) * | 2014-09-26 | 2015-01-28 | 黄欢 | Method for purifying air by utilization of activated water and air cleaning unit |
| CN105214424A (en) * | 2015-09-11 | 2016-01-06 | 宜兴市天马环保工程有限公司 | Tobacco leaf production technology of deodorization |
| CN106540528A (en) * | 2015-09-16 | 2017-03-29 | 中国科学院上海应用物理研究所 | A kind of processing method of chlorobenzene waste gas |
| 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 |
| CN107519740A (en) * | 2017-05-09 | 2017-12-29 | 赣州团团科技有限公司 | A kind of low-temperature ion odor removal |
| CN107551771A (en) * | 2017-09-11 | 2018-01-09 | 宁波捷通环保工程有限公司 | Low-temperature plasma photodissociation all-in-one |
| 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 |
| CN111437719A (en) * | 2020-03-13 | 2020-07-24 | 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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