CN210303172U - System for treating printing organic waste gas based on oxidizing free radicals - Google Patents
System for treating printing organic waste gas based on oxidizing free radicals Download PDFInfo
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- CN210303172U CN210303172U CN201920434976.8U CN201920434976U CN210303172U CN 210303172 U CN210303172 U CN 210303172U CN 201920434976 U CN201920434976 U CN 201920434976U CN 210303172 U CN210303172 U CN 210303172U
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- 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
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Abstract
The utility model discloses a system for treating printing organic waste gas based on oxidative free radicals, which comprises a primary multiphase oxidation device, a secondary multiphase oxidation device and a tertiary multiphase oxidation device which are sequentially communicated according to the gas flowing direction; the utility model discloses utilize the heterogeneous oxidation device of multistage formula to handle the VOCs pollutant among the printing organic waste gas, realize easily that the scale enlargies and the multiple VOCs pollutant of the high-efficient mineralize mineralization desorption of integration, multistage series design has ensured that waste gas dwell time is greater than 2s in the tower, the continuous injection of active oxygen molecule arouses more liquid phase free radicals simultaneously, gas-liquid reaction has been ensured, liquid-liquid reaction, gas-solid reaction, gas-gas reaction, aerial fog reaction lasts and goes on, the VOCs pollutant of strong degradation, realize aqueous solution quality of water recovery regeneration again, wet-type heterogeneous catalytic oxidation-the injection of active oxygen molecule arouses heterogeneous catalytic oxidation of heterogeneous wet-type again heterogeneous catalytic oxidation virtuous circle.
Description
Technical Field
The utility model relates to an environmental protection technology and industrial waste gas treatment technical field especially relate to an organic waste gas system of printing is handled to oxidability free radical.
Background
The printing organic waste gas refers to the volatile organic compounds generated in the processes of inking, drying or other heating and convection of the printing ink (containing pigment, resin, solvent, auxiliary agent and the like) in the printing process, and has the characteristics of large air volume, low concentration, heavy peculiar smell and mixing of a plurality of organic compounds. The solvent-based ink volatilizes to generate organic substances such as benzene, xylene, acetone, butanol or ethyl acetate, and the water-based ink exerts to generate organic substances such as ethanol, n-propanol, isopropanol, ethyl acetate or butyl acetate. Although the concentration of the printing organic waste gas is low, the total emission amount of pollutants exceeds the requirement of environmental protection standard, and the pollutants can reach the emission standard only after strict treatment. At present, the treatment technology of printing organic waste gas mainly comprises an activated carbon adsorption method, a thermal combustion method, a photocatalytic oxidation method, a biological method and the like, wherein a single treatment technology has different defects, the activated carbon adsorption replacement period is short, and the waste activated carbon is not resistant to humidity and high temperature (desorption at the temperature of less than 120 ℃) to generate a large amount of waste activated carbon; the thermal combustion method has high equipment investment cost, large operation energy consumption, needs auxiliary fuel and generates NOx secondary pollution; the photocatalytic oxidation method can not realize stable standard emission on the organic waste gas with the concentration of more than 0.03 percent; the biological method has huge equipment volume and can not realize stable standard discharge. In summary, the existing single treatment technology for printing organic waste gas has the problem of secondary pollution or failing to reach the standard stably, and in order to solve the problem of purification of various volatile organic pollutants in printing organic waste gas, a brand new treatment technology and system for printing organic waste gas still need to be developed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the defect and not enough that prior art handled, provide an oxidizing free radical and handle printing organic waste gas system, be the heterogeneous catalytic oxidation case that will print organic waste gas and introduce tertiary series connection, multiple volatile organic compounds thoroughly mineralizes under the effect of multistage formula active free radical to the inorganic matter in the realization printing organic waste gas.
In order to achieve the purpose, the technical scheme adopted by the utility model is that the system for treating the printing organic waste gas based on the oxidizing free radicals comprises a primary multiphase oxidation device, a secondary multiphase oxidation device and a tertiary multiphase oxidation device which are sequentially communicated according to the gas flow direction;
the first-stage multiphase oxidation device comprises a first box body, a first catalytic packing layer, a first sprayer and a first aqueous solution collecting tank; the first sprayer and the first catalytic packing layer are sequentially arranged in the first box body from top to bottom, and the first aqueous solution collecting tank is communicated with the first sprayer through a water pipe;
the two-stage multiphase oxidation device comprises a second box body, a second catalyst layer and an active oxygen molecular generator; the second box body is communicated with the air outlet end of the first box body, and the second catalyst layer is arranged in the second box body; the active oxygen molecule generator is communicated with the second box body.
The three-stage multiphase oxidation device comprises a third box body, a third catalytic packing layer, a third sprayer and a third aqueous solution collecting tank, wherein the third box body is communicated with the gas outlet end of the second box body; the third sprayer and the third catalytic packing layer are arranged in the third box body from top to bottom, and the third water solution collecting tank is communicated with the third sprayer.
The utility model discloses utilize the heterogeneous oxidation device of multistage formula to handle the VOCs pollutant among the printing organic waste gas, realize easily that the scale enlargies and the multiple VOCs pollutant of the high-efficient mineralize mineralization desorption of integration, multistage series design has ensured that waste gas dwell time is greater than 2s in the tower, the continuous injection of active oxygen molecule arouses more liquid phase free radicals simultaneously, gas-liquid reaction has been ensured, liquid-liquid reaction, gas-solid reaction, gas-gas reaction, aerial fog reaction lasts and goes on, the VOCs pollutant of strong degradation, realize aqueous solution quality of water recovery regeneration again, wet-type heterogeneous catalytic oxidation-the injection of active oxygen molecule arouses heterogeneous catalytic oxidation of heterogeneous wet-type again heterogeneous catalytic oxidation virtuous circle.
Preferably, the first-stage multiphase oxidation device further comprises a first demisting layer, and the first demisting layer is arranged inside the first box body and is positioned above the first sprayer.
Preferably, the secondary multiphase oxidation device further comprises a disperser, the disperser is arranged in the second box body and located above the second catalyst layer, and the disperser is communicated with the active oxygen staging generator.
Preferably, the third-stage multiphase oxidation device further comprises a third demisting layer, and the third demisting layer is arranged inside the third box and above the third sprayer.
Preferably, the first box body is coated with an epoxy resin corrosion-proof coating inside the third box body.
Preferably, the first defogging layer consists of a plastic polyhedral hollow sphere filler.
Preferably, the third demisting layer consists of plastic polyhedral hollow sphere fillers.
Preferably, the second catalytic layer is composed of a manganese oxide-iron oxide-copper oxide-cerium oxide honeycomb ceramic catalyst.
Preferably, the active oxygen molecule generator consists of a dielectric barrier micro discharge tube.
Preferably, the first-stage multiphase oxidation device further comprises a first water pump, and the first water pump is positioned between the first aqueous solution collecting tank and the first sprayer; the third-stage multiphase oxidation device also comprises a third water pump, and the third water pump is positioned between the third pizza water solution collecting tank and the third sprayer.
The utility model has the advantages that:
(1) the catalytic oxidation principle is clear, the structure is simple, the treatment process is normal temperature and normal pressure, any pretreatment equipment such as dust removal, dehumidification and concentration is not needed, and the operation and management are convenient;
(2) the hydroxyl free radical has strong oxidizability, can degrade and mineralize various VOCs, and has broad spectrum;
(3) the addition and adjustment of the active oxygen molecular oxidant can be used for treating printed VOCs with various concentrations, secondary gas pollution such as NOx is not generated, and near zero emission of VOCs becomes possible.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view showing the construction of an organic waste gas treatment system of comparative example 1;
fig. 3 is a schematic structural view of an organic exhaust gas treatment system of comparative example 2.
In the figure: 1. the device comprises a first-stage multiphase oxidation device, a second-stage multiphase oxidation device, a third-stage multiphase oxidation device, a first box body, a first gas inlet end, a first catalytic packing layer, a first sprayer, a first demisting layer, a first water solution collecting tank, a first water pump, a first gas outlet end, a first catalytic packing layer, a first water solution collecting tank, a first water pump and a second water pump, wherein the first water pump is; 21. a second box body 22, a second air inlet end 23, a disperser 24, a second catalyst layer 25, an active oxygen molecular generator 26 and a second air outlet end; 31. the third box body 32, a third air inlet end 33, a third catalytic packing layer 34, a third sprayer 35, a third demisting layer 36, a third aqueous solution 37, a third aqueous solution collecting tank 38, a third water pump 39 and a third air outlet end.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings, which are simplified schematic drawings and only schematically illustrate the basic structure of the invention, and the direction of the present embodiment is based on the direction of fig. 1.
Examples
The utility model discloses an oxidizing free radical printing organic waste gas treatment system, which comprises a primary multiphase oxidation device 1, a secondary multiphase oxidation device 2 and a tertiary multiphase oxidation device 3 which are communicated in sequence through a gas pipe according to the gas flowing direction;
the first-stage multiphase oxidation device 1 comprises a first box body 11, a first gas inlet end 12, a first catalytic packing layer 13, a first sprayer 14, a first demisting layer 15, a first aqueous solution collecting tank 17, a first water pump 18 and a first gas outlet end 19; the first box body 11 is a cuboid, is made of carbon steel, is internally treated with an epoxy resin corrosion-resistant coating, and has the length of 4000mm, the width of 2000mm and the height of 3000 mm; the first air intake port 12 is provided at one side of the first casing 11, preferably, at a bottom end thereof; the first demisting layer 15, the first sprayer 14 and the first catalytic filler layer 13 are fixedly arranged in the first box body 11 from top to bottom, and the fixing mode is realized by adopting the prior art; a first water solution 16 is filled in the first box body 11, a first water solution collecting tank 17 is arranged at one side of the bottom end of the first box body 11, the first water solution collecting tank 17 is communicated with the interior of the box body, and the first water solution 16 and the first water solution can flow into the first water solution collecting tank 17; the first aqueous solution collecting tank 17 is communicated with a first water pump 18 and the first sprayer 14 through water pipes. The water solution is recycled; the first gas outlet port 12 is disposed at the top of the first case 11. The first catalytic filler layer 13 is composed of a catalyst, and the catalyst is prepared by uniformly mixing and pressing 0.05% of manganese oxide, 0.01% of cobalt oxide, 60% of iron powder, 31.94% of activated carbon and 8% of clay in proportion into an ellipsoid (major axis is 50mm, minor axis is 20mm) and then sintering. The first demisting layer 15 consists of plastic polyhedral hollow sphere fillers with the diameter of 50 mm.
The two-stage multiphase oxidation device 2 comprises a second box body 21, a second air inlet end 22, a disperser 23, a second catalytic layer 24, an active oxygen molecular generator 25 and a second air outlet end 26; the second air inlet end 22 is arranged at the top end of the second box body 21 and communicated with the first air outlet end 19 through an air pipe, and the disperser 23 and the second catalyst layer 24 are sequentially and fixedly arranged in the second box body 21 from top to bottom according to the airflow flowing direction; an active oxygen molecule generator 25 is provided outside the second case 21, and the disperser 23 is communicated through the active oxygen molecule generator 25 by an air pipe. The second outlet port 26 is disposed at the bottom end of the second case 21.
The second catalyst layer 24 is composed of a manganese oxide-iron oxide-copper oxide-cerium oxide honeycomb ceramic catalyst, the honeycomb catalyst is prepared by taking honeycomb ceramic of 100mm × 100mm × 40mm as a carrier, performing structure regulation and control on active components of manganese oxide, iron oxide, copper oxide and cerium oxide by using an H-ZSM-5 molecular sieve, and performing impregnation, wherein the loading amounts (mass) of the manganese oxide, the iron oxide, the copper oxide and the cerium oxide are respectively 0.5%, 0.01% and 0.01%. The active oxygen molecule generator 25 consists of 20 dielectric barrier micro discharge tubes, the total power is 10kW, and the ionized air generates the active oxygen molecule oxidant.
The three-stage multiphase oxidation device 3 comprises a third box body 31, a third gas inlet end 32, a third catalytic packing layer 33, a third sprayer 34, a third demisting layer 35, a third aqueous solution collecting tank 37, a third water pump 38 and a third gas outlet end 39; the third box 31 is a cuboid, made of carbon steel, and treated with an epoxy resin corrosion-resistant coating, and has a length of 4000mm, a width of 2000mm, and a height of 3000 mm. The third air inlet end 32 is arranged on the side surface of the bottom end of the third box body 31 and is communicated with the second air outlet end 26, the third demisting layer 35, the third sprayer 34 and the third catalytic filler layer 33 are fixedly arranged in the third box body 31 from top to bottom, and the fixing mode is realized by adopting the prior art; a third tank 31 is internally filled with a third aqueous solution 36, a third aqueous solution collection tank 37 is arranged at one side of the bottom end of the third tank 31, and the third aqueous solution collection tank 37 is communicated with the inside of the tank and can flow into the third aqueous solution collection tank 37 together with the third aqueous solution 36; the third aqueous solution collecting tank 37 is connected to a third water pump 38 and the third sprayer 34 through water pipes. The water solution is recycled; the third gas outlet port 39 is provided at the top of the third tank 31.
The third catalytic filler layer 33 is composed of a catalyst, and the catalyst is prepared by uniformly mixing 1% of manganese oxide, 0.01% of copper oxide, 0.01% of cobalt oxide, 0.01% of cerium oxide, 65% of iron powder, 33.97% of activated carbon and 8% of clay in proportion, pressing the mixture into an ellipsoid (major axis 60mm, minor axis 30mm) shape, and sintering the ellipsoid. The third demisting layer 35 consists of a 38mm diameter plastic polyhedral hollow sphere packing.
The steps of the oxidizing free radical system for treating the printing organic waste gas of the utility model are as follows:
1) starting the first water pump 18, the active oxygen molecular generator 25 and the third-stage water pump 38; a first aqueous solution 16 in a first aqueous solution collecting tank 17 enters a first sprayer 14 through a first water pump 18, is uniformly sprayed above a first catalytic packing layer 13 in a divergent fog shape, is fully contacted with liquid, gas and a solid catalyst in a packing area, and is excited in a multiphase oxidation box to generate a strong oxidizing free radical source (hydroxyl free radical OH, hydroxyl free radical peroxide HOO and superoxide anion free radical O)2) (ii) a The active oxygen molecule oxidizer generated by the active oxygen molecule generator 25The excessive disperser 23 is injected above the second catalyst layer 24, gas, water mist and solid catalyst in the catalyst layer are in multiphase full contact, and strong oxidizing hydroxyl radical OH is generated by excitation in the catalyst layer of the multiphase oxidation box; a third aqueous solution 36 in a third aqueous solution collecting tank 37 enters a third sprayer 34 through a third water pump 38, is uniformly sprayed above a third catalytic packing layer 33 in a divergent fog shape, is fully contacted with three phases of liquid, gas and solid catalyst in a packing area, and is excited in a multiphase oxidation box to generate a strong oxidizing free radical source (hydroxyl free radical OH, hydroxyl free radical peroxide HOO and superoxide anion free radical O)2)。
2) Printing organic waste gas enters a first box body 11 through a first gas inlet end 12, the waste gas enters a first catalytic packing layer 13 with adsorption capacity from the lower part of the first catalytic packing layer 13, gas-liquid reaction, gas-solid reaction and liquid-solid reaction are completed in the first box body 11, VOCs (benzene, dimethylbenzene, acetone, butanol, ethyl acetate, ethanol, n-propanol and isopropanol) pollutants carried by the waste gas are strongly and rapidly decomposed, and the VOCs are decomposed into micromolecular organic byproducts, CO2And H2O, a small part of VOCs and undegraded products are chemically absorbed by the aqueous solution, most of VOCs are oxidized, degraded and absorbed through a multi-phase catalytic oxidation reaction in the first-stage multi-phase oxidation device 1, and then, the waste gas carrying the unreacted VOCs and degraded organic byproducts is discharged from a first gas outlet end 19 after water mist is removed through a first defogging layer 15;
3) the waste gas treated by the first-stage multiphase oxidation device 1 enters the second box 21 through the second air inlet 22 under the guidance of an air pipe, and is rapidly mixed with active oxygen molecules generated by an active oxygen molecule generator 25, and two reaction forms are completed in the second-stage multiphase oxidation device 2:
(1) direct reaction of reactive oxygenated molecules, i.e. VOCs contaminants + reactive oxygenated molecules → CO2+H2O products or intermediates;
(2) the active oxidation molecules form indirect reaction of hydroxyl after being catalyzed by the second catalyst layer, oxidants catalyze each other, and solid-phase catalysts catalyze to form hydroxyl radicals to initiate chain reaction, so that organic matters are thoroughly degraded, namely pollutants + OH → CO2+H2O。
After the multi-phase catalytic oxidation reaction in the second-stage multi-phase oxidation device, more VOCs are further oxidized, degraded and mineralized, and then the waste gas carrying unreacted VOCs, degradation byproducts and residual active oxygen molecular oxidant is discharged through a second gas outlet end 26;
3) the waste gas treated by the second-stage multiphase oxidation device 2 enters a third box body 31 through a third gas inlet end 32 under the guidance of a gas pipe, the waste gas enters a third-stage catalytic packing layer 33 with adsorption capacity from the lower part of the third catalytic packing layer 33, and gas-gas reaction, gas-liquid reaction, liquid-liquid reaction, gas-solid reaction and aerosol reaction are completed in the third-stage multiphase oxidation device 3 under the synergistic action of a catalyst and a residual active oxygen molecular oxidant, so that residual organic pollutants carried by the waste gas are strongly and rapidly decomposed and deeply mineralized into CO2And H2And O, after water mist of the waste gas is removed through the third demisting layer 35, the waste gas is discharged from the third gas outlet end 39, and clean discharge is realized.
Comparative example 1
As shown in fig. 2, the oxidative radical treatment printing organic waste gas system of the present comparative example is different from the present invention only in that the two-stage multiphase oxidation apparatus 2 is absent, and the first outlet port is directly connected to the third inlet port.
Comparative example 2
As shown in fig. 3, the oxidative radical treatment printing organic waste gas system of the present comparative example is different from the present invention only in that the three-stage heterogeneous oxidation apparatus 3 is absent.
20000m3The organic waste gas of/h printing ink printing passes through respectively the utility model discloses handle with comparative example 1, the heterogeneous catalytic oxidation case of comparative example 2, detect the volume around VOCs in its waste gas handles to calculate the clearance, the result is shown as table 1:
TABLE 1
| Group of | Removal rate of VOCs |
| The utility model discloses | 95％ |
| Comparative example 1 | 70％ |
| Comparative example 2 | 80％ |
Can know by last data, through the utility model discloses an after exhaust-gas treatment system handles, the rate of removal of VOCs is obviously than the good of comparative example 1 and comparative example 2. The utility model discloses a waste gas treatment system has satisfied the environmental protection requirement, has solved the difficult environmental problem of handling of big amount of wind, low concentration printing organic waste gas.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The system for treating the printing organic waste gas based on the oxidative free radicals is characterized by comprising a first-stage multiphase oxidation device, a second-stage multiphase oxidation device and a third-stage multiphase oxidation device which are sequentially communicated according to the gas flow direction;
the first-stage multiphase oxidation device comprises a first box body, a first catalytic packing layer, a first sprayer and a first aqueous solution collecting tank; the first sprayer and the first catalytic packing layer are sequentially arranged in the first box body from top to bottom, and the first aqueous solution collecting tank is communicated with the first sprayer through a water pipe;
the two-stage multiphase oxidation device comprises a second box body, a second catalyst layer and an active oxygen molecular generator; the second box body is communicated with the air outlet end of the first box body, and the second catalyst layer is arranged in the second box body; the active oxygen molecule generator is communicated with the second box body;
the three-stage multiphase oxidation device comprises a third box body, a third catalytic packing layer, a third sprayer and a third aqueous solution collecting tank, wherein the third box body is communicated with the gas outlet end of the second box body; the third sprayer and the third catalytic packing layer are arranged in the third box body from top to bottom, and the third water solution collecting tank is communicated with the third sprayer.
2. The oxidative radical-based treatment printing organic waste gas system according to claim 1, wherein the primary multi-phase oxidation device further comprises a first demister layer disposed inside the first tank and above the first sprayer.
3. The oxidative radical-based treatment printing organic waste gas system according to claim 1, wherein the secondary heterogeneous oxidation device further comprises a disperser disposed inside the second tank and above the second catalytic layer, the disperser being in communication with the active oxygen staging generator.
4. The oxidative radical-based treatment printing organic waste gas system according to claim 1, wherein the three-stage multiphase oxidation device further comprises a third demister layer disposed inside the third tank and above the third sprayer.
5. The system for treating printing organic waste gas based on oxidative radicals as claimed in claim 1, wherein the first and third housings are coated with an epoxy resin anticorrosive coating.
6. The oxidative radical-based treatment printed organic waste gas system according to claim 2, wherein the first demister layer consists of a plastic polyhedral hollow sphere filler.
7. The oxidative radical-based treatment printed organic waste gas system according to claim 1, wherein the third demister layer is composed of a plastic polyhedral hollow sphere filler.
8. The oxidative radical-based treatment printed organic waste gas system according to claim 1, wherein the second catalytic layer is composed of a manganese oxide-iron oxide-copper oxide-cerium oxide honeycomb ceramic catalyst.
9. The oxidative radical-based treatment printing organic waste gas system according to claim 1, wherein the reactive oxygen species generator is comprised of a dielectric barrier micro-discharge tube.
10. The oxidative radical-based treatment printing organic waste gas system according to claim 1, wherein the primary multi-phase oxidation apparatus further comprises a first water pump located between the first aqueous solution collection tank and the first sprayer; the third-stage multiphase oxidation device also comprises a third water pump, and the third water pump is positioned between the third pizza water solution collecting tank and the third sprayer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920434976.8U CN210303172U (en) | 2019-04-01 | 2019-04-01 | System for treating printing organic waste gas based on oxidizing free radicals |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109985519A (en) * | 2019-04-01 | 2019-07-09 | 广州尚洁环保科技有限公司 | Organic waste gas system and waste gas processing method are printed based on oxidative free radical processing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109985519A (en) * | 2019-04-01 | 2019-07-09 | 广州尚洁环保科技有限公司 | Organic waste gas system and waste gas processing method are printed based on oxidative free radical processing |
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Address after: 510000 room 1814-1815, 1936 Kaichuang Avenue, Huangpu District, Guangzhou City, Guangdong Province Patentee after: Guangzhou Shangjie Environmental Protection Technology Co.,Ltd. Address before: 510000 room 1814-1815, 1936 Kaichuang Avenue, Huangpu District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU SHANGJIE ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |
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