CN106076086A - A kind of method of normal-temperature efficient catalytic degradation vehicle spray painting industry VOCs waste gas - Google Patents
A kind of method of normal-temperature efficient catalytic degradation vehicle spray painting industry VOCs waste gas Download PDFInfo
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- CN106076086A CN106076086A CN201610506076.0A CN201610506076A CN106076086A CN 106076086 A CN106076086 A CN 106076086A CN 201610506076 A CN201610506076 A CN 201610506076A CN 106076086 A CN106076086 A CN 106076086A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 19
- 230000015556 catabolic process Effects 0.000 title claims abstract description 18
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 16
- 238000007592 spray painting technique Methods 0.000 title claims abstract description 11
- 239000012855 volatile organic compound Substances 0.000 title claims abstract 8
- 239000007921 spray Substances 0.000 claims abstract description 47
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000005507 spraying Methods 0.000 claims abstract description 22
- 239000003054 catalyst Substances 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 17
- 229910021650 platinized titanium dioxide Inorganic materials 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 12
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- -1 hydroxyl radical free radical Chemical class 0.000 claims abstract description 10
- 239000008187 granular material Substances 0.000 claims abstract description 8
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- 238000006479 redox reaction Methods 0.000 claims abstract description 4
- 230000001590 oxidative effect Effects 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 9
- 239000003973 paint Substances 0.000 claims description 9
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 229910019029 PtCl4 Inorganic materials 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000008346 aqueous phase Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 9
- 238000011282 treatment Methods 0.000 abstract description 9
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000003672 processing method Methods 0.000 abstract 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 244000005700 microbiome Species 0.000 description 5
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007084 catalytic combustion reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000011284 combination treatment Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011943 nanocatalyst Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007591 painting process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
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Classifications
-
- 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
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
- B01D2255/1021—Platinum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20707—Titanium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0258—Other waste gases from painting equipments or paint drying installations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
A kind of method that the invention discloses normal-temperature efficient catalytic degradation vehicle spray painting industry VOCs waste gas, belong to waste gas pollution control and treatment technical field, clear water under it comprises the steps: (1) spraying waste gas and sprays from top to bottom collides in opposite directions, the coating cloud granule in removing spraying waste gas；(2) waste gas after step (1) processes collides in opposite directions with spraying lower alkaline spray liquid from top to bottom, neutralizes and reacts generation salt；(3) waste gas after step (2) processes is passed through ozone, at Pt/TiO2Under the effect of catalyst, ozone and the reaction of moisture in waste gas, the O of generation2Produce redox reaction with hydroxyl radical free radical with waste gas, generate CO2And H2O, completes to spray the process of waste gas.This kind of processing method need not heating, the most just can carry out, thus required cost is relatively low, can be suitable for spraying on a large scale the use of VOCs exhaust-gas treatment.
Description
Technical field
The invention belongs to waste gas pollution control and treatment technical field, be specifically related to a kind of normal-temperature efficient catalytic degradation vehicle spray painting industry
The method of VOCs waste gas.
Background technology
Along with the raising of our people's level of consumption, automobile demand amount the most constantly rises, and auto manufacturing has been pushed into one
The individual new stage.Auto manufacturing, while fast development, also presents the one side of its extensive style, be mainly reflected in energy-conservation and
Environmental protection aspect, especially Painting Shop are once famous with high energy consumption, high pollution.Painting dressing automobiles can produce substantial amounts of coating coating cloud, contains
There are the volatile organic gas (VOCs) such as the toluene of higher concentration, dimethylbenzene and NMHC.These VOCs are not only to human body
Produce stimulation, serious threat human health, and the alkene in organic compound and some arene compound are at sunlight
Effect under, it is also possible to and nitrogen oxides reacts and forms the photochemical fog of Los Angeles type or industrial photochemical fog,
Cause secondary pollution, ecological environment is damaged.Therefore, how processing the VOCs in Painting Shop is that pendulum is in face of us
One major issue.
At present, mainly in the majority with physico-chemical process to the treatment technology of VOC, main active charcoal
Absorption method, Physical Absorption method, Production by Catalytic Combustion Process and membrane absorption method etc..Recently, the Biological fitler method of rise is owing to having removal effect
Rate is high, operating cost is low and the advantage such as less formation secondary pollution and by extensive concern.Biological fitler method is mainly by efficiently
Filler rapid mass transfer, the characteristic of absorption and the specific function of microorganism, make waste gas quickly enter filling surface, connect with microorganism
Touch, thus by VOCs mass degradation or change into some harmless or low harmful class materials.But, utilize single bio-filter technology
During processing spraying waste gas, spraying not only can reduce the removal effect of biofiltration device, and can be to device
Body cause abrasion and corrosion, to such an extent as to be unable to reach good removal effect.
Chinese patent 201410722698.8 discloses a kind of spraying exhaust gas biological purifying combination treatment method, and the method will
Spraying waste gas first filters through cellucotton defecator, then sends into the reactor equipped with filler in the way of bottom in and top out and carry out biology
Filtering, while biofiltration, the type of flow from top to bottom carries out the spray of nutritional solution to filler, provides raw for microorganism
Other elements beyond carbon source needed for length, ensure the activity of microorganism, improve clean-up effect.Although this kind of method can be efficiently
Remove the volatility major pollutants such as the coating cloud produced in painting process and toluene, dimethylbenzene, NMHC, but need to take
Substantial amounts of area, increases application cost, and the kind of microorganism is also a very important influence factor, reduces controlled
Property.
Summary of the invention
The technical problem to be solved is to provide a kind of normal-temperature efficient catalytic degradation vehicle spray painting industry VOCs and gives up
The method of gas, it is possible to improve the regulation effect to spraying waste gas under normal temperature condition.
For solving above-mentioned technical problem, the technical scheme is that invention a kind of normal-temperature efficient catalytic degradation automobile spray
The method being coated with industry VOCs waste gas, it is characterised in that: comprise the steps:
(1) the spraying waste gas collected enters the first spray column from bottom, under and spraying from top to bottom in the first spray column
Clear water collide in opposite directions, the coating cloud granule in removing spraying waste gas, the bottom of the first spray column is discharged and is accumulated by coating cloud granule
Paint liquid, top discharge spray process after waste gas；
The waste gas that (2) first spray columns are discharged enters the second spray column from bottom, with from top to bottom in the second spray column
Alkaline spray liquid under Pen Lin collides in opposite directions, neutralizes reaction and generates salt, and salt is discharged in the bottom of the second spray column, spray is discharged at top
Waste gas after process；
The waste gas that (3) second spray columns are discharged is passed through ozone, at Pt/TiO2Under the effect of catalyst, ozone and waste gas
In reaction of moisture, the O of generation2Produce redox reaction with hydroxyl radical free radical with waste gas, generate CO2And H2O, completes spraying
The process of waste gas；Described Pt/TiO2The preparation method of catalyst is:
A. TiCl is passed through4With the TiO that glycol reaction prepares two atom thick2Sheet；
B. the TiO of 1 mass parts in step a is taken2Sheet is dispersed in the water of 1 mass parts, adds the H of 0.05 mass parts2PtCl4,
Then with magnetic stirrer solution 2h under constant temperature, make the Pt ionic adsorption in solution at TiO2On sheet；
C. the TiO being adsorbed with Pt ion obtained in ultraviolet irradiation step b of wavelength 200～275nm is used2Sheet
10min, then cleans with water and prepares Pt/TiO2Catalyst.
Preferably, in step (3), described Pt/TiO2Catalyst is supported on filler.
Preferably, described step (3) is carried out in airtight oxidizing tower, and filler is positioned at the middle part of oxidizing tower, oxidizing tower
The connection ozonator of bottom and the top of the second spray column, top connection aiutage.
Preferably, the paint liquid collected in step (1) is as spray-applied primer.
Preferably, in described step c, clean to impurity content in filtrate less than 1%.
Compared with prior art, the invention has the beneficial effects as follows:
1, reaction need not heating, the most just can carry out, thus required cost is relatively low, can be suitable for spraying on a large scale
It is coated with the use of VOCs exhaust-gas treatment.
2, efficient catalytic VOCs degraded under room temperature, gaseous ozone molecule can be changed under conditions of steam by catalyst
Substantial amounts of hydroxyl radical free radical, the strong oxidizing property catalysis VOCs degraded that hydroxyl radical free radical has；Reaction activity can also be reduced simultaneously,
Improve reaction rate, accelerate VOCs degradation reaction speed.Both combine and can quickly be degraded by VOCs at normal temperatures, it is to avoid existing
There is the deficiency of catalytic combustion process in technology.
3, catalyst ozone produces the release of a large amount of " gaseous state " hydroxyl radical free radical at normal temperatures, and between the waste gas of gaseous state because of
Without any alternate resistance, can aoxidize and reduction with the catalysis of gaseous state VOCs molecule contacts fast and efficiently, VOCs is cleared up into little point
Sub-CO2、H2O and very small amount inorganic salt so that control the efficiency amplification of " gas " with " gas ".Practical Project runs and shows: gas is passing through
Reaction zone speed just can reach good treatment effect, complete qualified discharge between 1-11m/s.
4, there are not naked light, bright electricity, at normal temperatures efficient catalytic pollutant in this technology, it is not necessary to high temperature, without electrion,
Without pulse, without the potential safety hazard of the strengthening means such as ultraviolet light, extremely safe is used to there is not inflammable and explosive potential safety hazard.
5, the catalyst of the present invention is atomic dispersion level, and the surface area that catalyst contacts with VOCs is greatly increased, activity
Site is increased, thus reaction rate increases, and degradation rate improves so that the treatment effect of VOCs is more preferable.
6, the present invention uses pure noble metal to make atom level nanocatalyst, and undope other elements, and catalytic performance is relative
More preferable in the catalyst of other elements that adulterate, to the catalytic performance of ozone more preferably, can produce more efficiently, rapidly hydroxyl from
By base, so that VOCs degradation rate is faster.
7, the present invention can process in vehicle spray painting industry the material of the difficult degradation of benzene homologues in VOCs based on efficient degradation,
Compare the material of residual in the VOCs after additive method processes less, administer more thorough.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in further detail.
It is as follows that the present invention administers spraying waste gas step in automobile manufacture industry:
(1) the spraying waste gas collected enters the first spray column from bottom, under and spraying from top to bottom in the first spray column
Clear water collide in opposite directions so that the coating cloud granule in waste gas is stopped, mutually collision accumulates big paint particle, increase from
Heavy sensation of the body power, thus change the direction of motion, flow down with clear water, reach the purpose of coating cloud granule, the first spray in removing spraying waste gas
The waste gas after spray processes is discharged at paint liquid, top that the bottom discharge of tower is accumulated by coating cloud granule.Collect paint liquid, as again
The priming paint of spraying uses, it is achieved the recycling of paint vehicle.
The waste gas that (2) first spray columns are discharged enters the second spray column from bottom, with from top to bottom in the second spray column
Alkaline spray liquid under Pen Lin collides in opposite directions, and alkalescence spray liquid and the acid ingredient in waste gas occur to neutralize reaction, and generation is dissolved in
Water or water-fast salt, discharge with spray liquid and discharge from the bottom of the second spray column, through neutralizing reacted waste gas then
Discharge from the top of the second spray column.After this treatment, the corrosive power of waste gas is substantially reduced, and alleviates the corruption of subsequent processes
Degree of corrosion, is beneficial to extend the service life of follow-up equipment.
The waste gas that (3) second spray columns are discharged is passed through in airtight oxidizing tower, and filler is positioned at the middle part of oxidizing tower, oxidation
The connection ozonator of the bottom of tower and the top of the second spray column, top connection aiutage.At Pt/TiO2The work of catalyst
Under with, ozone and the reaction of moisture in waste gas, the O of generation2Produce redox reaction with hydroxyl radical free radical with waste gas, generate CO2
And H2O, the waste gas after process is arranged to aiutage through air-introduced machine, finally arranges to air, completes to spray the process of waste gas；Reaction principle
As follows:
On the one hand, Pt/TiO2Catalyst degradation VOCs and O2The activation energy of reaction, makes reaction be more prone to carry out, simultaneously
Also reduce reaction temperature, save the energy.
VOCs and O2The mechanism of reaction:
O2+activesite→2[O]
VOCS+activesite→[VOCS]
[O]+[VOC]→CO2+O2
On the other hand, ozone is under the catalytic action of noble metal, with the moisture in moistening waste gas and the water vapour in air
Reaction, has been ultimately breaks down into O2And hydroxyl radical free radical, and hydroxyl radical free radical is owing to having strong oxidizing property, it is possible to VOCs is oxidized to
CO2And H2O。
O3+H2O→H2O2+O2
H2O2→2·OH
VOCS+·OH→CO2+H2O
Another further aspect, catalyst purify simultaneously in CO, HC and NOx three-effect catalysis system in VOCs, complete to CO, HC oxygen
Chemical conversion CO2And water, NOx is reduced into nitrogen.
Oxidation reaction:
2CO+O2→2CO2
4HC+5O2→4CO2+2H2O
2NO+2CO→2CO2+N2
4HC+10NO→5N2+4CO2+2H2O
6NO+4NH3→5N2+6H2O
2NH3→N2+3H2
Reduction reaction:
2NO+2H2→N2+2H2O
NOx+xCO→1/2N2+xCO2
CO+H2O→CO2+H2
Under common effect in terms of three above, the treatment effect of VOCs gas significantly improves, and processes efficiently, Er Qiecheng
This is relatively low, can be realized on a large scale using.
Described Pt/TiO2The preparation method of catalyst is:
A. TiCl is passed through4With the TiO that glycol reaction prepares two atom thick2Sheet；
B. the TiO of 1 mass parts in step a is taken2Sheet is dispersed in the water of 1 mass parts, adds the H of 0.05 mass parts2PtCl4,
Then with magnetic stirrer solution 2h under constant temperature, make the Pt ionic adsorption in solution at TiO2On sheet；
C. the TiO being adsorbed with Pt ion obtained in ultraviolet irradiation step b of wavelength 200～275nm is used2Sheet
10min, the wavelength of ultraviolet light can be specially 200nm, 240nm and 275nm；Then clean with water, clean to impurity in filtrate
Content is less than 1%, prepares Pt/TiO2Catalyst, by Pt/TiO2Catalyst is supported on filler, then places the torr in oxidizing tower
On dish.
Through overtesting, the regulation effect of spraying waste gas see table:
Thus it can be seen that at room temperature, this invention is higher to the degradation rate of arene in VOCs for result, and discharge
Concentration nearly reaches uncontrollable discharge monitoring concentration limit, and therefore effect is the prettyst good.
The above, be only presently preferred embodiments of the present invention, is not the restriction that the present invention makees other form, appoints
What those skilled in the art is combined possibly also with the technology contents of the disclosure above, changes or retrofits and is the present invention
Equivalent embodiments.But every without departing from technical solution of the present invention content, implement above according to the technical spirit of the present invention
Any simple modification, equivalent variations and the remodeling that example is made, still falls within the protection domain of technical solution of the present invention.
Claims (5)
1. the method for a normal-temperature efficient catalytic degradation vehicle spray painting industry VOCs waste gas, it is characterised in that: comprise the steps:
(1) the spraying waste gas collected enters the first spray column from bottom, in the first spray column with from top to bottom spray under clear
Aqueous phase coating cloud granule in collision, removing spraying waste gas, the paint accumulated by coating cloud granule is discharged in the bottom of the first spray column
Liquid, top discharge the waste gas after spray processes；
(2) first spray columns discharge waste gas enter the second spray column from bottom, in the second spray column with spray from top to bottom
Under alkaline spray liquid collide in opposite directions, neutralize reaction and generate salt, salt is discharged in the bottom of the second spray column, top is discharged spray and processed
After waste gas；
The waste gas that (3) second spray columns are discharged is passed through ozone, at Pt/TiO2Under the effect of catalyst, ozone and the water in waste gas
Divide reaction, the O of generation2Produce redox reaction with hydroxyl radical free radical with waste gas, generate CO2And H2O, completes to spray waste gas
Process；Described Pt/TiO2The preparation method of catalyst is:
A. TiCl is passed through4With the TiO that glycol reaction prepares two atom thick2Sheet；
B. the TiO of 1 mass parts in step a is taken2Sheet is dispersed in the water of 1 mass parts, adds the H of 0.05 mass parts2PtCl4, then
With magnetic stirrer solution 2h under constant temperature, make the Pt ionic adsorption in solution at TiO2On sheet；
C. the TiO being adsorbed with Pt ion obtained in ultraviolet irradiation step b of wavelength 200～275nm is used2Sheet 10min, so
Clean with water afterwards and prepare Pt/TiO2Catalyst.
The method of normal-temperature efficient catalytic degradation vehicle spray painting industry VOCs waste gas the most according to claim 1, its feature exists
In: in step (3), described Pt/TiO2Catalyst is supported on filler.
The method of normal-temperature efficient catalytic degradation vehicle spray painting industry VOCs waste gas the most according to claim 2, its feature exists
In: described step (3) is carried out in airtight oxidizing tower, and filler is positioned at the middle part of oxidizing tower, and the connection of the bottom of oxidizing tower is smelly
Oxygen Generator and the top of the second spray column, top connection aiutage.
4. according to the method for the arbitrary described normal-temperature efficient catalytic degradation vehicle spray painting industry VOCs waste gas of claims 1 to 3, its
It is characterised by: the paint liquid collected in step (1) is as spray-applied primer.
The method of normal-temperature efficient catalytic degradation vehicle spray painting industry VOCs waste gas the most according to claim 4, its feature exists
In: in described step c, clean to impurity content in filtrate less than 1%.
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| CN106731571A (en) * | 2016-12-23 | 2017-05-31 | 易能环境技术有限公司 | The purifier and its method of a kind of vehicle spray painting VOCs |
| CN107930380A (en) * | 2017-11-06 | 2018-04-20 | 天津大学 | A kind of method of room-temperature catalytic oxidation degraded VOCs |
| CN108479335A (en) * | 2018-04-23 | 2018-09-04 | 苏州市奇捷生物科技有限公司 | A kind of VOCs exhaust gas comprehensive processing technique |
| CN112473343A (en) * | 2020-12-10 | 2021-03-12 | 北京天中方环保科技有限公司 | Waste gas treatment equipment and method |
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| CN106731571A (en) * | 2016-12-23 | 2017-05-31 | 易能环境技术有限公司 | The purifier and its method of a kind of vehicle spray painting VOCs |
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| CN112473343A (en) * | 2020-12-10 | 2021-03-12 | 北京天中方环保科技有限公司 | Waste gas treatment equipment and method |
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