CN109985518A - One kind handling coating automatic assembly line waste gas system based on oxidative free radical - Google Patents

One kind handling coating automatic assembly line waste gas system based on oxidative free radical Download PDF

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Publication number
CN109985518A
CN109985518A CN201910260114.2A CN201910260114A CN109985518A CN 109985518 A CN109985518 A CN 109985518A CN 201910260114 A CN201910260114 A CN 201910260114A CN 109985518 A CN109985518 A CN 109985518A
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free radical
level
oxidation
order
assembly line
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杜长明
宋世炜
陈浩卓
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Guangzhou Shangjie Environmental Protection Technology Co Ltd
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Guangzhou Shangjie Environmental Protection Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8678Removing components of undefined structure
    • B01D53/8687Organic components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/80Type of catalytic reaction
    • B01D2255/802Photocatalytic
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/70Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708Volatile organic compounds V.O.C.'s
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/80Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/804UV light

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The invention discloses one kind to handle coating automatic assembly line waste gas system based on oxidative free radical, including the free radical multi-phase oxidation column and free radical gaseous oxidation case being sequentially arranged by airflow direction, the free radical multi-phase oxidation column is connected to the free radical gaseous oxidation case, the free radical multi-phase oxidation column generates oxidative free radical by injection active oxygen species, and the free radical gaseous oxidation case generates oxidative free radical by photodissociation.VOCs pollutant in occurring gas-gas, solution-air, liquid-liquid, the reaction of gas-solid and aerosol heterogeneous oxidation simultaneously in free radical multi-phase oxidation column, by strong fast degradation, and heterogeneous oxidation-aqueous solution injection active oxygen species regenerate-is formed in tower and excites the benign cycle of strong oxidizing property radical source-heterogeneous oxidation.The composite reactive component efficient capture of oxidative free radical and catalyst that undegraded or not degradable pollutant is then generated by ultraviolet lamp in free radical gaseous oxidation case, and exhaustive oxidation is degraded, without secondary pollution, environmental protection and energy saving.

Description

One kind handling coating automatic assembly line waste gas system based on oxidative free radical
Technical field
The present invention relates to industrial waste gas processing technology fields, more particularly to a kind of oxidative free radical that is based on to handle coating certainly Dynamic production line waste gas system.
Background technique
Coating refers to metal and nonmetallic surface protective mulch or decorative layer.With industrial automation technology Fast development, coating are developed from craft to industrial automation direction, and coating automatic assembly line is more and more extensive to be deep into its people Economic multiple industrial circles.Coating automatic assembly line mainly by pre-processing electrophoresis line, sealing primary coat line, middle paintings line, face painting line, Refine line and drying system composition can generate lacquer spraying waste gas and drying exhaust gas in spray painting and drying course respectively, and usually mixing is received Coating automatic assembly line organic exhaust gas is formed after collection, pollutant component is mainly volatile organic matter (VOCs), including benzene, toluene, Dimethylbenzene, hexane, heptane, methyl ethyl ketone, ethyl acetate, carbon tetrachloride etc., concentration are about 500~l000mg/m3, much super Cross environmental protection standard requirement, it is necessary to could qualified discharge by stringent processing.
Currently, the Treatment process of coating organic exhaust gas mainly has: absorption method, flame combustion method, Production by Catalytic Combustion Process, photodissociation method Deng.Coating automatic assembly line generallys use what conventional activated carbon absorption was combined with catalysis burning according to active carbon adsorption Treatment process is designed based on absorption and catalysis 2 basic principles of burning, i.e. Adsorption Concentration-catalysis burning is destroyed, using 2 A above active carbon adsorber continuous work, and be used interchangeably between each absorber.This method requires active carbon will periodically not Disconnected regeneration, the absorption property that otherwise will lead to active carbon are gradually reduced.Therefore it needs to regularly replace active carbon, can also generate work Property charcoal danger wastes.And flame combustion method handles coating automatic assembly line organic exhaust gas, can generate NOx, tar, dioxin etc. Toxic by-products, while a large amount of natural gases need to be consumed.Coating automatic assembly line generallys use boiling according to zeolite runner absorption method Stone runner adsorbs the treatment process combined with thermal accumulating incinerator, is based on 2 basic principle designs of absorption and flame combustion , i.e., runner Adsorption Concentration-flame combustion is destroyed, and equipment used in this method is expensive, and when operation also needs to consume a large amount of natural gases, NO can be generated simultaneouslyx, tar, the toxic by-products such as dioxin.
To sum up, existing coating automatic assembly line VOCs treatment technology is high etc. there are secondary pollution and operating cost Problem increases the production cost of enterprise.It therefore, is a variety of volatile organic contaminants in solution coating automatic assembly line exhaust gas Purification problem, it is still necessary to develop completely new VOCs treatment technology and system.
Summary of the invention
It is an object of the invention to solve above-mentioned shortcoming and defect existing in the prior art, provide based on oxidation free love Base handles coating automatic assembly line waste gas system.Processing system of the invention can wave a variety of in coating automatic assembly line exhaust gas The organic matter exhaustive oxidation degradation of hair property, without secondary pollution, operating cost is lower.
To realize its purpose, the technical solution adopted by the present invention are as follows:
One kind handling coating automatic assembly line waste gas system based on oxidative free radical comprising presses airflow direction successively cloth The free radical multi-phase oxidation column and free radical gaseous oxidation case set, the free radical multi-phase oxidation column and the free radical gas phase oxygen Change case connection, the free radical multi-phase oxidation column generates oxidative free radical, the free radical by injection active oxygen species Gaseous oxidation case generates oxidative free radical by photodissociation.Preferably, the free radical multi-phase oxidation column and the free radical It is connected between gaseous oxidation case by air hose.
Preferably, the free radical multi-phase oxidation column includes active oxygen species generator and tower body;It is equipped in the tower body Interconnected first order free radical heterogeneous oxidation area, second level free radical heterogeneous oxidation area and aqueous solution collecting tank, described Level-one free radical heterogeneous oxidation area is separated by side by side with the second level free radical heterogeneous oxidation area, and the aqueous solution collecting tank is set to The lower section in the first order free radical heterogeneous oxidation area and the second level free radical heterogeneous oxidation area.Preferably, described first Grade free radical heterogeneous oxidation area be separated by with the second level free radical heterogeneous oxidation area by partition, the partition with it is described water-soluble It is spaced between the water surface of liquid collecting tank.
Preferably, the shape of the tower body is cuboid, is made of stainless steel or carbon steel material, the inside of the tower body Make the rotten anti-coating treatment of epoxy resin.
Preferably, the active oxygen species generator is made of dielectric barrier discharge pipe, generates activity by ionized air Oxygen molecule.
Preferably, the first order free radical heterogeneous oxidation area be equipped with the waste gas inlet being sequentially arranged along airflow direction, First order spray thrower and first order catalytic filler layer;The first order spray thrower is connected to the aqueous solution collecting tank, and described It is additionally provided with first order water pump and first order ejector on the pipeline that level-one spray thrower is connected to the aqueous solution collecting tank, described Level-one water pump and the first order ejector are sequentially arranged along water (flow) direction, the first order ejector also with the active oxygen Electronic generator connection.
Preferably, the first order catalytic filler layer is made of the first spherical catalyst, and first catalyst is by mistake Cross metal oxide, active carbon and clay composition.Preferably, the transition metal oxide include iron, cobalt, manganese, copper, nickel, zinc, At least one of the oxide of silver.
Preferably, the second level free radical heterogeneous oxidation area is equipped with the catalysis along the second level that airflow direction is sequentially arranged and fills out The bed of material, second level spray thrower, second level demisting packing layer and gas outlet;The second level spray thrower and the aqueous solution collecting tank It is connected to, is additionally provided with second level water pump on the pipeline that the second level spray thrower is connected to the aqueous solution collecting tank and the second level is penetrated Flow device, the second level water pump and the second level ejector be sequentially arranged along water (flow) direction, the second level ejector also with The active oxygen species generator connection, the gas outlet is connected to the inlet end of the free radical gaseous oxidation case.
Preferably, the second level catalytic filler layer is made of the second spherical catalyst, and second catalyst is by mistake Cross metal oxide, rare-earth oxide, active carbon and clay composition.Preferably, the transition metal oxide include iron, At least one of cobalt, manganese, copper, nickel, zinc, oxide of silver.Preferably, the rare-earth oxide include lanthanum, cerium, praseodymium, At least one of neodymium, oxide of yttrium.
Preferably, the second level demisting packing layer is made of Taylor's filler for flower ring.
Preferably, the free radical gaseous oxidation case includes cabinet, and the cabinet is equipped with inlet end and outlet side, the case In vivo be equipped with along the first order ultraviolet lamp area that airflow direction is sequentially arranged, first order photodissociation Catalytic Layer, second level ultraviolet lamp area and Second level photodissociation Catalytic Layer.
Preferably, the purple that first order ultraviolet lamp area and the second level ultraviolet lamp Qu Youneng generation wavelength are 185nm Outer lamp group at.
Preferably, the shape of the cabinet is cuboid, is made of stainless steel or carbon steel material, the inside of the cabinet Make the rotten anti-coating treatment of epoxy resin.
Preferably, the first order photodissociation Catalytic Layer and the second level photodissociation Catalytic Layer are by absorbent-type titanium dioxide-two Manganese oxide-copper oxide-cobalt oxide honeycomb catalyst is constituted.Honeycomb catalyst of the invention can enhance TiO2Adsorb the energy of VOCs Power, and TiO can be reduced2Photo-generate electron-hole is to compound probability.
Preferably, the honeycomb catalyst the preparation method comprises the following steps: using ceramic honey comb as carrier, utilize H-ZSM-5 molecular sieve Structure regulating is carried out to titanium dioxide, manganese dioxide, copper oxide and cobalt oxide active component, and titanium dioxide is made by infusion process Titanium, manganese dioxide, copper oxide and supported by cobalt oxide are in obtained on the ceramic honey comb.Preferably, the specification of the ceramic honey comb For 100mm × 100mm × 40mm.
The method based on oxidative free radical processing coating automatic assembly line waste gas system, includes the following steps:
(1) start the active oxygen species generator of free radical multi-phase oxidation column, first order water pump, second level water pump and from By the first order ultraviolet lamp area of base gaseous oxidation case and the ultraviolet lamp in second level ultraviolet lamp area.Aqueous solution in aqueous solution collecting tank Before respectively enteing first order spray thrower, second level spray thrower by first order water pump, second level water pump, the first order is first passed through Active oxygen species (the two oxygroup cation O that ejector, second level ejector injection active oxygen species generator generate2 +, ozone O3), it is formed and absorbs oxidation solution.Then first order catalysis is sprayed into diverging is misty by first order spray thrower, second level spray thrower Packing layer and second level catalytic filler layer.In packing area, liquid, gas, solid catalyst three-phase are come into full contact with, more in free radical Excitation generates strong oxidizing property radical source (hydroxyl radical free radical in phase oxidation tower·OH, hydroperoxyl free radical HOO·, super oxygen yin from Sub- free radical·O2–)。
(2) coating automatic assembly line exhaust gas is by waste gas inlet freedom of entry base multi-phase oxidation column, and exhaust gas is from the first order Enter the first order catalytic filler layer with adsorption capacity above catalytic filler layer, it is complete in first order free radical heterogeneous oxidation area It is reacted at gas-gas reaction, gas-liquid reaction, liquid-liquid reactions, gas-solid reaction and aerosol, what strong fast degradation exhaust gas carried VOCs, is resolved into small molecule by VOCs (benzene,toluene,xylene, hexane, heptane, methyl ethyl ketone, ethyl acetate etc.) pollutant Organic by-products, CO2And H2O, fraction VOCs and undegraded product are absorbed by chemistry of aqueous solution.It is more by first order free radical Multi-phase catalytic oxidation in phase oxidation area, most of VOCs are oxidized degradation and absorption.Then, it carries unreacted VOCs and has Prepared separation channel of the exhaust gas of machine by-product below partition and above aqueous solution enters second level free radical heterogeneous oxidation area. Exhaust gas enters the second level catalytic filler layer with adsorption capacity below the catalytic filler layer of the second level, and in the second level, free radical is more Gas-gas reaction, gas-liquid reaction, liquid-liquid reactions, gas-solid reaction and aerosol reaction are continued to complete in phase oxidation area, it is strong to degrade VOCs, is resolved into small molecule organic by-products, CO by the VOCs pollutant that exhaust gas carries2And H2O, a small amount of VOCs and undegraded production Object is absorbed by chemistry of aqueous solution.The lasting injection of active oxygen species excites more liquid phase free radicals, and it is water-soluble to continue oxygenolysis Pollutant in liquid realizes the regeneration of aqueous solution quality recovery, forms heterogeneous oxidation in tower-aqueous solution injection active oxygen species again Life-excitation strong oxidizing property radical source-again in tower heterogeneous oxidation benign cycle.Carry the exhaust gas warp for the VOCs that is not degraded on a small quantity After crossing second level demisting packing layer removing water mist, it is discharged from the gas outlet in second level free radical heterogeneous oxidation area, and then enter certainly By base gaseous oxidation case.
(3) treated that exhaust gas enters under the guidance of air hose for the free radical multi-phase oxidation column by active oxygen species injection Free radical gaseous oxidation case.In the oxidative free radical of ultraviolet lamp area (first order ultraviolet lamp area and second level ultraviolet lamp area) excitation Oxidation and catalyst layer (first order photodissociation catalyst layer, second level photodissociation catalyst layer) composite reactive component titanium dioxide-two Under manganese oxide-copper oxide-cobalt oxide catalysis oxidation synergistic effect, VOCs organic pollutant, which is degraded, is converted into harmless object, clearly Clean tail gas is discharged from the outlet side of free radical gaseous oxidation case.
The beneficial effects of the present invention are:
(1) present invention handles VOCs pollutant using the free radical multi-phase oxidation column of active oxygen species injection, easy to accomplish Scale amplification and integrated high-efficiency mineralising remove a variety of VOCs pollutants.The secondary oxidation area series connection of free radical multi-phase oxidation column is set Meter ensures that residence time of the exhaust gas in tower is greater than 2s, while the lasting injection of active oxygen species excites more liquid phases free Base, it is ensured that the lasting progress that gas-gas reaction, gas-liquid reaction, liquid-liquid reactions, gas-solid reaction, aerosol react, it is strong to degrade VOCs pollutant, and realize the regeneration of aqueous solution quality recovery, form heterogeneous oxidation in tower-aqueous solution injection active oxygen species again Life-excitation strong oxidizing property radical source-again in tower heterogeneous oxidation benign cycle, solve coating automatic assembly line organic exhaust gas Intractable the difficult problem of environmental protection.
(2) alternating of the ultraviolet lamp layers of the second level of free radical gaseous oxidation case and secondary absorption type photodissociation Catalytic Layer series connection is set It sets, scale amplification easy to accomplish and integrated high-efficiency mineralising VOCs pollutant, it is ensured that residence time of the exhaust gas in oxidation case Greater than 2s, the oxidative free radical of ultraviolet lamp generation and the composite reactive component titanium dioxide-two of catalyst can make full use of Manganese oxide-copper oxide-cobalt oxide, efficient capture, catalysis oxidation super low concentration VOCs pollutant.Meanwhile the oxygen that ultraviolet lamp generates Changing free love base has modification regeneration effect to catalyst, effectively extends replacement cycle and the service life of catalyst.
Detailed description of the invention
Fig. 1 is the structural representation of the present invention that coating automatic assembly line waste gas system is handled based on oxidative free radical Figure.
In figure, free radical multi-phase oxidation column 1, free radical gaseous oxidation case 2, air hose 3, active oxygen species generator 11, tower Body 12, first order free radical heterogeneous oxidation area 13, second level free radical heterogeneous oxidation area 14, aqueous solution collecting tank 15, partition 16, Aqueous solution 17, waste gas inlet 131, first order spray thrower 132, first order catalytic filler layer 133, first order water pump 134, first Grade ejector 135, second level catalytic filler layer 141, second level spray thrower 142, second level demisting packing layer 143, gas outlet 144, second level water pump 145, second level ejector 146, cabinet 21, inlet end 22, outlet side 23, first order ultraviolet lamp area 24, First order photodissociation Catalytic Layer 25, second level ultraviolet lamp area 26, second level photodissociation Catalytic Layer 27.
Specific embodiment
To better illustrate the object, technical solutions and advantages of the present invention, the present invention passes through the following example furtherly It is bright.It should be understood that the embodiment of the present invention is merely to illustrate technical effect of the invention, protection model and is not intended to limit the present invention It encloses.In embodiment, method therefor is conventional method unless otherwise instructed.
Embodiment 1
Certain auto parts and components Co., Ltd mainly produces auto parts and components, is planned according to the market demand and self-growth, right Reorganization and expansion is carried out in original Painting Shop, removes 3 manual spray cabinets of existing manual spray line, increases coating automatic assembly line newly One, coating automatic assembly line organic exhaust gas 20000m is formed after mixed collection3/ h, pollutant component are mainly volatile organic matter (VOCs), concentration is about 500mg/m3, it has been more than environmental protection standard requirement, it is necessary to could qualified discharge by stringent processing.Using Of the invention is handled based on oxidative free radical processing coating automatic assembly line waste gas system, as shown in Figure 1.Coating is automatic Production line 20000m3/ h exhaust treatment system includes the free radical multi-phase oxidation column 1 being sequentially arranged on air hose by airflow direction With free radical gaseous oxidation case 2, free radical multi-phase oxidation column 1 is connected with free radical gaseous oxidation case 2 by air hose 3.
Free radical multi-phase oxidation column 1 includes active oxygen species generator 11 and tower body 12;Active oxygen species generator 11 by 20 dielectric barrier discharge pipe compositions, general power 10kW, ionized air generate active oxygen species (two oxygroup cation O2 +, ozone O3);The shape of tower body 12 is cuboid, is made of carbon steel material, and the rotten anti-coating treatment of epoxy resin is made in inside, tower body 12 A length of 8000mm, width 4000mm, a height of 3000mm.First order free radical heterogeneous oxidation area 13, the second level are equipped in tower body 12 Free radical heterogeneous oxidation area 14 and aqueous solution collecting tank 15.First order free radical heterogeneous oxidation area 13 and second level free radical multiphase Zoneofoxidation 14 is located at the top of aqueous solution collecting tank 15, and first order free radical heterogeneous oxidation area 13 and second level free radical multiphase Be set side by side between zoneofoxidation 14 and be spaced by partition 16, aqueous solution collecting tank 15 is provided with aqueous solution 17, partition 16 with There are the intervals of supplied gas circulation between the water surface of aqueous solution 17.
First order free radical heterogeneous oxidation area 13 is equipped with the waste gas inlet 131 being sequentially arranged along airflow direction, the first order Spray thrower 132 and first order catalytic filler layer 133.First order spray thrower 132 is connected to by water pipe with aqueous solution collecting tank 15;It presses Water (flow) direction has also been sequentially arranged first order water pump 134 and first order ejector 135 on the water pipe;First order ejector 135 is also It is connected to by water pipe with active oxygen species generator 11.
First order catalytic filler layer 133 is made of the first catalyst, and the first catalyst is by 55% iron oxide, 5% titanium dioxide Manganese, 33% active carbon and 7% clay composition (weight percent), the shape of the first catalyst are the sphere of diameter 50mm.
Second level free radical heterogeneous oxidation area 14 be equipped with the second level catalytic filler floor 141 being sequentially arranged along airflow direction, Second level spray thrower 142, second level demisting packing layer 143 and gas outlet 144.Second level spray thrower 142 by water pipe with it is water-soluble Liquid collecting tank 15 is connected to, and by water (flow) direction, has also been sequentially arranged second level water pump 145 and second level ejector 146 on the water pipe, Second level ejector 146 is also connected to by water pipe with active oxygen species generator 11.
Second level catalytic filler layer 141 is made of the second catalyst, and the second catalyst is by 52.6% iron oxide, 7% dioxy Change manganese, 0.1% lanthanum sesquioxide, 0.1% ceria, 33.2% activated carbon and 7% clay and forms (weight percent), second The shape of catalyst is the sphere of diameter 50mm.Plastics Taylor's filler for flower ring group that second level demisting packing layer is 51mm by diameter At.
Free radical gaseous oxidation case 2 includes cabinet 21, and the shape of cabinet 21 is cuboid, is made of stainless steel, Make the rotten anti-coating treatment of epoxy resin, a length of 4000mm of cabinet 21, width 1150mm, a height of 2400mm in inside.Cabinet 21 is set There are inlet end 22 and outlet side 23, is equipped in cabinet 21 along the first order ultraviolet lamp area 24 that airflow direction is sequentially arranged, the first order Photodissociation Catalytic Layer 25, second level ultraviolet lamp area 26 and second level photodissociation Catalytic Layer 27.First order ultraviolet lamp area 24 and the second level are purple The area Wai Deng 26 is made of the U-shaped vacuum UV lamp that 24 energy generation wavelengths are 185nm respectively, the long 810mm of vacuum UV lamp, power 150W/ branch.Specifically, first order ultraviolet lamp area 24 and second level ultraviolet lamp area 26 are successively arranged 4 purples along airflow direction respectively Outer lamp layers, each ultraviolet lamp layers install 6 vacuum UV lamps respectively.The gas outlet 144 in second level free radical heterogeneous oxidation area 14 It is connected to by air hose 3 with the inlet end 22 of cabinet 21.
First order photodissociation Catalytic Layer 25 and second level photodissociation Catalytic Layer 27 are by absorbent-type titania-silica manganese-oxidation Copper-cobalt oxide honeycomb catalyst is constituted, and honeycomb catalyst utilizes H- using 100mm × 100mm × 40mm ceramic honey comb as carrier ZSM-5 molecular sieve carries out structure regulating to titanium dioxide, manganese dioxide, copper oxide and cobalt oxide active component, passes through infusion process Preparation, titanium dioxide, manganese dioxide, copper oxide, cobalt oxide load capacity (quality) be respectively 0.1%, 0.05%, 0.01%, 0.01%.Honeycomb catalyst can enhance TiO2The ability of VOCs is adsorbed, and TiO can be reduced2Photo-generate electron-hole is to compound Probability.
The method based on oxidative free radical processing coating automatic assembly line waste gas system, includes the following steps:
(1) start active oxygen species generator 11, first order water pump 134, the second level water pump of free radical multi-phase oxidation column 1 145 and free radical gaseous oxidation case 2 first order ultraviolet lamp area 24 and second level ultraviolet lamp area 26 ultraviolet lamp.Aqueous solution is received Aqueous solution in collection slot 15 is respectively enteing first order spray thrower 132, second by first order water pump 134, second level water pump 145 Before grade spray thrower 142, first order ejector 135 is first passed through, second level ejector 146 injects the life of active oxygen species generator 11 At active oxygen species (two oxygroup cation O2 +, ozone O3), it is formed and absorbs oxidation solution.Then by first order spray thrower 132, Second level spray thrower 142 sprays into first order catalytic filler layer 133 and second level catalytic filler layer 141 in diverging is misty.In filler Area's liquid, gas, solid catalyst three-phase come into full contact with, and it is free to generate strong oxidizing property for excitation in free radical multi-phase oxidation column 1 Ji Yuan (hydroxyl radical free radical·OH, hydroperoxyl free radical HOO·, ultra-oxygen anion free radical·O2–)。
(2) coating automatic assembly line exhaust gas is by 131 freedom of entry base multi-phase oxidation column 1 of waste gas inlet, and exhaust gas is from the Enter the first order catalytic filler layer 133 with adsorption capacity above one stage catalyzing packing layer 133, in first order free radical multiphase Gas-gas reaction, gas-liquid reaction, liquid-liquid reactions, gas-solid reaction and aerosol reaction, strong fast degradation are completed in zoneofoxidation 13 VOCs (benzene,toluene,xylene, hexane, heptane, methyl ethyl ketone, ethyl acetate etc.) pollutant that exhaust gas carries, VOCs points Solution is at small molecule organic by-products, CO2And H2O, fraction VOCs and undegraded product are absorbed by chemistry of aqueous solution.By first Multi-phase catalytic oxidation in grade free radical heterogeneous oxidation area 13, most of VOCs are oxidized degradation and absorption.Then, it carries not The prepared separation channel of reaction VOCs and the exhaust gas of organic by-products below partition 16 and above aqueous solution 17 enters the second level Free radical heterogeneous oxidation area 14.Exhaust gas enters the second level with adsorption capacity below second level catalytic filler layer 141 and is catalyzed Packing layer 141, continued to complete in second level free radical heterogeneous oxidation area 14 gas-gas reaction, gas-liquid reaction, liquid-liquid reactions, VOCs, is resolved into the organic by-product of small molecule by gas-solid reaction and aerosol reaction, the VOCs pollutant that strong exhaust gas of degrading carries Object, CO2And H2O, a small amount of VOCs and undegraded product are absorbed by chemistry of aqueous solution.The lasting injection excitation of active oxygen species is more Liquid phase free radical, continue oxygenolysis aqueous solution in pollutant, realize aqueous solution quality recovery regeneration, formed tower in multiphase Oxidation-aqueous solution injection active oxygen species regenerate-excite strong oxidizing property radical source-again in tower heterogeneous oxidation benign cycle. The exhaust gas for the VOCs that is not degraded on a small quantity is carried after second level demisting packing layer 143 removes water mist, free radical is more from the second level The gas outlet 144 in phase oxidation area 14 is discharged.
(3) treated the exhaust gas of free radical multi-phase oxidation column 1 by active oxygen species injection under the guidance of air hose 3 into Enter free radical gaseous oxidation case 2.In the oxidation of ultraviolet lamp area (first order ultraviolet lamp area 24 and second level ultraviolet lamp area 26) excitation The oxidation of free love base and catalyst layer (first order photodissociation catalyst layer 25, second level photodissociation catalyst layer 27) composite reactive component Under the synergistic effect of titania-silica manganese-copper oxide-cobalt oxide catalysis oxidation, VOCs organic pollutant is degraded conversion For harmless object, clean tail gas is discharged from the outlet side 23 of free radical gaseous oxidation case 2.
The coating automatic assembly line exhaust gas of the said firm is produced through of the invention based on oxidative free radical processing coating automatically After line waste gas system purified treatment, the VOCs removal rate in mix waste gas stably reaches 95%, meets environmental requirement, solves The intractable the difficult problem of environmental protection of coating automatic assembly line organic exhaust gas.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention The limitation of range is protected, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should Understand, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the essence of technical solution of the present invention And range.

Claims (10)

1. one kind handles coating automatic assembly line waste gas system based on oxidative free radical, which is characterized in that including pressing air-flow side To the free radical multi-phase oxidation column and free radical gaseous oxidation case being sequentially arranged, the free radical multi-phase oxidation column and the freedom The connection of base gaseous oxidation case, the free radical multi-phase oxidation column generate oxidative free radical by injection active oxygen species, institute Free radical gaseous oxidation case is stated by photodissociation to generate oxidative free radical.
2. handling coating automatic assembly line waste gas system based on oxidative free radical as described in claim 1, which is characterized in that The free radical multi-phase oxidation column includes active oxygen species generator and tower body;The interconnected first order is equipped in the tower body Free radical heterogeneous oxidation area, second level free radical heterogeneous oxidation area and aqueous solution collecting tank, the first order free radical multiphase oxygen Change area to be separated by side by side with the second level free radical heterogeneous oxidation area, the aqueous solution collecting tank is set to the first order free radical The lower section in heterogeneous oxidation area and the second level free radical heterogeneous oxidation area.
3. handling coating automatic assembly line waste gas system based on oxidative free radical as described in claim 1, which is characterized in that The free radical gaseous oxidation case includes cabinet, and the cabinet is equipped with inlet end and outlet side, is equipped in the cabinet along air-flow First order ultraviolet lamp area, first order photodissociation Catalytic Layer, second level ultraviolet lamp area and the second level photodissociation catalysis that direction is sequentially arranged Layer.
4. handling coating automatic assembly line waste gas system based on oxidative free radical as claimed in claim 2, which is characterized in that The first order free radical heterogeneous oxidation area is equipped with the waste gas inlet being sequentially arranged along airflow direction, first order spray thrower and the One stage catalyzing packing layer;The first order spray thrower is connected to the aqueous solution collecting tank, the first order spray thrower with it is described First order water pump and first order ejector are additionally provided on the pipeline of aqueous solution collecting tank connection, the first order water pump and described the Level-one ejector is sequentially arranged along water (flow) direction, and the first order ejector is also connected to the active oxygen species generator.
5. handling coating automatic assembly line waste gas system based on oxidative free radical as claimed in claim 2, which is characterized in that The second level free radical heterogeneous oxidation area is equipped with second level catalytic filler floor, the second level spray being sequentially arranged along airflow direction Device, second level demisting packing layer and gas outlet;The second level spray thrower is connected to the aqueous solution collecting tank, the second level Second level water pump and second level ejector, the second level are additionally provided on the pipeline that spray thrower is connected to the aqueous solution collecting tank Water pump and the second level ejector are sequentially arranged along water (flow) direction, and the second level ejector is also sent out with the active oxygen species Raw device connection, the gas outlet is connected to the inlet end of the free radical gaseous oxidation case.
6. handling coating automatic assembly line waste gas system based on oxidative free radical as claimed in claim 3, which is characterized in that The first order photodissociation Catalytic Layer and the second level photodissociation Catalytic Layer are by absorbent-type titania-silica manganese-copper oxide-oxygen Change cobalt honeycomb catalyst to constitute.
7. handling coating automatic assembly line waste gas system based on oxidative free radical as claimed in claim 6, which is characterized in that The honeycomb catalyst the preparation method comprises the following steps: using ceramic honey comb as carrier, using H-ZSM-5 molecular sieve to titanium dioxide, dioxy Change manganese, copper oxide and cobalt oxide active component and carry out structure regulating, and titanium dioxide, manganese dioxide, oxidation are made by infusion process Copper and supported by cobalt oxide are in obtained on the ceramic honey comb.
8. handling coating automatic assembly line waste gas system based on oxidative free radical as claimed in claim 4, which is characterized in that The first order catalytic filler layer is made of the first spherical catalyst, and first catalyst is by transition metal oxide, work Property charcoal and clay composition;Preferably, the transition metal oxide includes in the oxide of iron, cobalt, manganese, copper, nickel, zinc, silver It is at least one.
9. handling coating automatic assembly line waste gas system based on oxidative free radical as claimed in claim 5, which is characterized in that The second level catalytic filler layer is made of the second spherical catalyst, and second catalyst is by transition metal oxide, dilute Soil metal oxide, active carbon and clay composition;Preferably, the transition metal oxide include iron, cobalt, manganese, copper, nickel, zinc, At least one of the oxide of silver;Preferably, the rare-earth oxide includes in the oxide of lanthanum, cerium, praseodymium, neodymium, yttrium At least one.
10. handling coating automatic assembly line waste gas system based on oxidative free radical as claimed in claim 5, feature exists In the second level demisting packing layer is made of Taylor's filler for flower ring.
CN201910260114.2A 2019-04-01 2019-04-01 One kind handling coating automatic assembly line waste gas system based on oxidative free radical Pending CN109985518A (en)

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Application publication date: 20190709