CN212091693U - Integrated combined purifier - Google Patents
Integrated combined purifier Download PDFInfo
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- CN212091693U CN212091693U CN202020389305.7U CN202020389305U CN212091693U CN 212091693 U CN212091693 U CN 212091693U CN 202020389305 U CN202020389305 U CN 202020389305U CN 212091693 U CN212091693 U CN 212091693U
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- air inlet
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- gas outlet
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- air outlet
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 43
- 230000003197 catalytic effect Effects 0.000 claims abstract description 42
- 238000006303 photolysis reaction Methods 0.000 claims abstract description 42
- 230000008878 coupling Effects 0.000 claims abstract description 13
- 238000010168 coupling process Methods 0.000 claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 239000003054 catalyst Substances 0.000 claims description 22
- 239000000945 filler Substances 0.000 claims description 13
- 230000010354 integration Effects 0.000 claims description 6
- 230000015843 photosynthesis, light reaction Effects 0.000 abstract description 29
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 43
- 239000012855 volatile organic compound Substances 0.000 description 26
- 238000005516 engineering process Methods 0.000 description 13
- 244000005700 microbiome Species 0.000 description 9
- 230000006872 improvement Effects 0.000 description 7
- 239000003595 mist Substances 0.000 description 7
- 239000002912 waste gas Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 235000015097 nutrients Nutrition 0.000 description 4
- 239000010815 organic waste Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 230000001699 photocatalysis Effects 0.000 description 2
- 239000011941 photocatalyst Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 230000007096 poisonous effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- -1 and therefore Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses an integrated combined purifier, which comprises a UV photolysis catalytic converter, an ozone catalytic device, a bio-trickling filter, a fan and an exhaust funnel, the UV photolysis catalytic converter is provided with a first air inlet and a first air outlet, the ozone catalytic device is provided with a second air inlet and a second air outlet, the biological trickling filter is provided with a third air inlet and a third air outlet, the first air outlet is connected with the second air inlet through a pipeline, the second air outlet is connected with the third air inlet through a pipeline, the third air outlet is connected with the air inlet of the fan through a pipeline, the air outlet of fan pass through the tube coupling in the aiutage, the utility model discloses the ozone that produces among the make full use of exhaust-gas treatment process reaches wastes material resourceful purpose, realizes no secondary pollution, improves exhaust-gas treatment efficiency.
Description
Technical Field
The utility model relates to an integration combination formula clarifier.
Background
As industrial source volatile organic matter emission relates to a plurality of industries, the waste gas usually contains a plurality of volatile organic matters such as toluene, olefin, esters, alcohols and the like, and the emission type is complex, the moisture content of the waste gas is high, the concentration is low, and enterprises disperse and have great treatment difficulty. Therefore, the treatment of volatile organic compounds with low concentration and multiple components as main characteristics is the key and difficult point in the current pollution control field, and further research on novel treatment equipment and process is urgently needed to provide theoretical guidance and method basis for developing and applying efficient, energy-saving and safe volatile organic compound treatment technology.
For the treatment of volatile organic compounds, the mainstream technologies at home and abroad at present mainly include adsorption recovery technology, photocatalytic technology, combustion technology, biological purification technology, adsorption technology, condensation technology and combustion technology integration technology, however, the technologies all have respective defects, such as hazardous waste generated by adsorption saturation of the adsorption method, low efficiency of the photocatalytic technology, high cost of the combustion technology and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an integration combination formula clarifier to solve one or more technical problem that exist among the prior art, provide a profitable selection or create the condition at least.
The utility model provides a solution of its technical problem is:
integration combination formula clarifier, including UV photodissociation catalyst converter, ozone catalytic unit, bio-trickling filter, fan, aiutage, be provided with first air inlet and first gas outlet on the UV photodissociation catalyst converter, last second air inlet and the second gas outlet of being provided with of ozone catalytic unit, be provided with third air inlet and third gas outlet on the bio-trickling filter, first gas outlet pass through the tube coupling in the second air inlet, the second gas outlet pass through the tube coupling in the third air inlet, the third gas outlet pass through the tube coupling in the air intake of fan, the air outlet of fan pass through the tube coupling in the aiutage.
The technical scheme at least has the following beneficial effects: after a fan is started, industrial organic waste gas enters a UV photolysis catalytic converter from a first gas inlet, in the UV photolysis catalytic converter, the organic waste gas is fully contacted with a photocatalyst in the UV photolysis catalytic converter, under the irradiation of an ultraviolet lamp, macromolecular volatile organic compounds in the waste gas are degraded and converted into micromolecular volatile organic compounds, the photolyzed volatile organic compounds and ozone generated by photolysis are discharged from a first gas outlet and introduced into an ozone catalytic device from a second gas inlet, the photolysis volatile organic compounds are fully contacted with the ozone catalyst in the ozone catalytic device to continuously oxidize untreated completely volatile organic compounds, finally, the residual micromolecular volatile organic compounds are discharged from the second gas outlet and introduced into a biological trickling filter tower from a third gas inlet, harmful components in the gas are decomposed under the action of microorganisms, the gas is purified, and enters an exhaust barrel from the third gas inlet and is discharged, so can make full use of the poisonous ozone that produces in the UV photodissociation catalyst converter, the cooperation ozone catalyst can continue to oxidize volatile organic compound, has both improved catalytic efficiency, and no secondary pollution has increased biological trickling filter back in addition, and two preceding devices are not handled complete volatile organic compound and continue to be oxidized by the microorganism, and last exhaust gas reaches emission standard, high-efficient environmental protection more.
As a further improvement of the above technical scheme, the UV photolysis catalytic converter includes the photolysis box, first air inlet with first gas outlet set up in on the photolysis box, be provided with the filter screen in the first air inlet, be provided with the fluorescent tube support in the photolysis box, evenly be provided with a plurality of UV fluorescent tube along vertical direction on the fluorescent tube support. Waste gas enters into the photodissociation box from first air inlet in, at first filter the particulate matter through the filter screen, in the photodissociation box, the UV fluorescent tube is installed on the fluorescent tube support, the ultraviolet irradiation who sends is on the TiO2 catalyst of spraying, arouse electron and the hole that they produced to become the oxidation of macromolecule volatile organic compound and become little molecule volatile organic compound, the oxygen molecule in the high energy ultraviolet ray beam can the decomposed air produces free oxygen simultaneously, the unbalancing of the positive and negative electron that free oxygen carried needs to combine with the oxygen molecule, and then produce ozone, ozone is provided for ozone catalytic unit.
As a further improvement of the above technical solution, the ozone catalytic apparatus includes a catalytic box, the second air inlet and the second air outlet are disposed on the catalytic box, and a plurality of mesh plates are uniformly arranged in the catalytic box along a direction from the second air inlet to the second air outlet. Gas enters the second air inlet from the first air outlet, and in the catalysis box body, the ozone catalyst made by taking honeycomb ceramics as a substrate is placed on the screen plate, and the untreated complete volatile organic compound and the ozone generated by photolysis contact the ozone catalyst to further oxidize the volatile organic compound, so that the ozone generated by photolysis can be utilized by the ozone catalysis device, and meanwhile, the influence of the ozone on subsequent biological treatment can be prevented.
As a further improvement of the technical scheme, a plurality of drawers are arranged on the catalytic box body, and the mesh plate is arranged in each drawer. The screen plate is arranged in the drawer, so that the screen plate can be conveniently pulled out of the catalytic box body, and the assembly and disassembly are convenient.
As a further improvement of the above technical scheme, the biotrickling filter comprises a tower body, the third air inlet and the third air outlet are arranged on the tower body, a filler support, a water tank, a water pump and a circulating water pipe are arranged in the tower body, the water tank is connected with the circulating water pipe through the water pump, a plurality of nozzles are arranged on the circulating water pipe, and the filler support is provided with a plurality of nozzles along the vertical direction. Gas enters the third air inlet from the second air outlet, a biological filler tree is arranged on a filler support in the tower body, nutrient solution is filled in the water tank, and is delivered to the nozzle by virtue of the water pump and the circulating water pipe to be sprayed out, so that nutrients required for growth are provided for microorganisms.
As a further improvement of the technical scheme, the tower body is provided with a plurality of observation holes. The condition of the microorganisms inside can be observed at any time.
As a further improvement of the technical scheme, a wind shield is arranged in the third air inlet, and a plurality of vent holes are uniformly formed in the wind shield. Uniform air intake can be realized.
As a further improvement of the technical scheme, a demisting device is arranged in the third air outlet. And the demisting device is utilized to avoid bringing excessive water vapor out of the tower body.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the internal structure of the UV photolysis catalyst of the present invention;
figure 3 is the internal structure schematic diagram of the ozone catalytic device of the present invention.
In the drawings: 100-UV photolysis catalyst, 110-photolysis box body, 120-lamp tube bracket, 130-UV lamp tube, 200-ozone catalytic device, 210-catalytic box body, 220-screen plate, 300-biotrickling filter, 310-filler bracket, 320-water tank, 330-water pump, 340-circulating water pipe, 400-fan and 500-exhaust funnel.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Referring to fig. 1, integration combination formula clarifier, including UV photolysis catalyst converter 100, ozone catalytic unit 200, biotrickling filter 300, fan 400, aiutage 500, be provided with first air inlet and first gas outlet on the UV photolysis catalyst converter 100, be provided with second air inlet and second gas outlet on the ozone catalytic unit 200, be provided with third air inlet and third gas outlet on the biotrickling filter 300, first gas outlet pass through the tube coupling in the second air inlet, the second gas outlet pass through the tube coupling in the third air inlet, the third gas outlet pass through the tube coupling in the air intake of fan 400, the air outlet of fan 400 pass through the tube coupling in aiutage 500.
From the above, after the fan 400 is started, the industrial organic waste gas enters the UV photolysis catalytic converter 100 from the first gas inlet, in the UV photolysis catalytic converter 100, the organic waste gas is fully contacted with the photocatalyst in the UV photolysis catalytic converter 100, under the irradiation of the ultraviolet lamp, the macromolecular volatile organic compounds in the waste gas are degraded and converted into the micromolecular volatile organic compounds, the photolyzed volatile organic compounds and the ozone generated by photolysis are discharged from the first gas outlet and introduced into the ozone catalytic device 200 from the second gas inlet, and are fully contacted with the ozone catalyst in the ozone catalytic device 200, the untreated volatile organic compounds are continuously oxidized, finally, the residual micromolecular volatile organic compounds are discharged from the second gas outlet and introduced into the bio-trickling filter 300 from the third gas inlet, and the harmful components in the gas are decomposed under the action of microorganisms, gas obtains purifying, gets into aiutage 500 and discharges from the third air inlet, so can make full use of the poisonous ozone that produces in the UV photodissociation catalyst converter 100, cooperation ozone catalyst can continue to oxidize volatile organic compound, both improved catalytic efficiency, and no secondary pollution, increased biological trickling filter 300 back, two former devices untreated complete volatile organic compound continue to be oxidized by the microorganism, and exhaust gas reaches emission standard at last, high-efficient environmental protection more.
As shown in fig. 2, in some embodiments, the UV photolysis catalyst 100 includes a photolysis box 110, the first air inlet and the first air outlet are disposed on the photolysis box 110, a filter screen is disposed in the first air inlet, a lamp tube support 120 is disposed in the photolysis box 110, and a plurality of UV lamp tubes 130 are uniformly disposed on the lamp tube support 120 along a vertical direction. Waste gas enters the photolysis box body 110 from the first air inlet, filter particulate matter through the filter screen at first, in the photolysis box body 110, UV fluorescent tube 130 is installed on fluorescent tube support 120, the ultraviolet ray of sending shines on the TiO2 catalyst of spraying, arouse electron and hole that they produced and come the oxidation of macromolecule volatility organic compound to become the micromolecule volatility organic compound, high energy ultraviolet ray light beam can decompose the oxygen molecule in the air simultaneously and produce free oxygen, the unbalance of positive negative electron that free oxygen carried needs to combine with the oxygen molecule, and then produce ozone, provide ozone for ozone catalytic unit 200.
As shown in fig. 3, in some embodiments, the ozone catalyzing device 200 includes a catalyzing box 210, the second air inlet and the second air outlet are disposed on the catalyzing box 210, and a plurality of mesh plates 220 are uniformly arranged in the catalyzing box 210 along a direction from the second air inlet to the second air outlet. Gas enters the second gas inlet from the first gas outlet, in the catalytic box 210, the ozone catalyst made of honeycomb ceramics as a substrate is placed on the screen 220, the volatile organic compound which is not completely processed and the ozone generated by photolysis contact the ozone catalyst to further oxidize the volatile organic compound, the ozone catalytic device 200 can utilize the ozone generated by photolysis, and simultaneously, the ozone can be prevented from influencing the subsequent biological treatment.
In some embodiments, several drawers are disposed on the catalytic box 210, and each drawer has the mesh plate 220 disposed therein. The screen plate 220 is arranged in the drawer, so that the screen plate 220 can be conveniently pulled out of the catalytic box body 210, and the assembly and disassembly are convenient.
In some embodiments, the bio-trickling filter 300 includes a tower body, the third air inlet and the third air outlet are disposed on the tower body, a filler support 310, a water tank 320, a water pump 330, and a water circulating pipe 340 are disposed in the tower body, the water tank 320 is connected to the water circulating pipe 340 through the water pump 330, a plurality of nozzles are disposed on the water circulating pipe 340, and a plurality of nozzles are disposed on the filler support 310 in a vertical direction. Gas enters a third gas inlet from a second gas outlet, a biological filler tree is arranged on a filler support 310 in the tower body, nutrient solution is filled in a water tank 320 and is sent to a nozzle by a water pump 330 and a circulating water pipe 340 to be sprayed out, so that nutrients required for growth are provided for microorganisms, when volatile organic compounds are contacted with the filler, microorganisms of a biological film formed on the surface of the filler oxidize gas molecules and degrade the volatile organic compounds into carbon dioxide and water, and therefore, waste gas is fully purified and can be discharged after reaching the standard.
In some embodiments, the tower body is provided with a plurality of observation holes. The condition of the microorganisms inside can be observed at any time.
In some embodiments, a wind deflector is arranged in the third air inlet, and a plurality of vent holes are uniformly arranged on the wind deflector. Uniform air intake can be realized.
In some embodiments, a demisting device is disposed in the third air outlet. The demisting device is used for avoiding bringing excessive water vapor out of the tower body, the demisting device has multiple structural forms, a baffle plate demister can be selected, the baffle plate demister utilizes mist particles to have inertia in moving air flow, the flow direction of the mist-containing air flow is suddenly changed, the mist particles deviate from the flow direction of the air flow under the action of the inertia, the mist particles are collided on the baffle plate and separated, the flow direction of the mist-containing air flow is changed under the action of the baffle plate, the mist particles are separated by utilizing the inertia of the mist particles, and the demisting device is similar to an inertia dust collector.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.
Claims (8)
1. Integration combination formula clarifier, its characterized in that: including UV photodissociation catalyst converter (100), ozone catalytic unit (200), biotrickling filter (300), fan (400), aiutage (500), be provided with first air inlet and first gas outlet on UV photodissociation catalyst converter (100), be provided with second air inlet and second gas outlet on ozone catalytic unit (200), be provided with third air inlet and third gas outlet on biotrickling filter (300), first gas outlet pass through the tube coupling in the second air inlet, the second gas outlet pass through the tube coupling in the third air inlet, the third gas outlet pass through the tube coupling in the air intake of fan (400), the air outlet of fan (400) pass through the tube coupling in aiutage (500).
2. The integrated, modular purifier of claim 1, wherein: UV photodissociation catalyst converter (100) is including photodissociation box (110), first air inlet with first gas outlet set up in on the photodissociation box (110), be provided with the filter screen in the first air inlet, be provided with fluorescent tube support (120) in the photodissociation box (110), evenly be provided with a plurality of UV fluorescent tube (130) along vertical direction on fluorescent tube support (120).
3. The integrated, modular purifier of claim 1, wherein: the ozone catalytic device (200) comprises a catalytic box body (210), the second air inlet and the second air outlet are arranged on the catalytic box body (210), and a plurality of screen plates (220) are uniformly arranged in the catalytic box body (210) along the direction from the second air inlet to the second air outlet.
4. The integrated, modular purifier of claim 3, wherein: the catalytic box body (210) is provided with a plurality of drawers, and each drawer is internally provided with the mesh plate (220).
5. The integrated, modular purifier of claim 1, wherein: biological trickling filter (300) includes the tower body, the third air inlet with the third air outlet set up in on the tower body, be provided with filler support (310), water tank (320), water pump (330), circulating water pipe (340) in the tower body, water tank (320) pass through water pump (330) connect in circulating water pipe (340), be provided with a plurality of nozzle on circulating water pipe (340), filler support (310) are provided with a plurality of along vertical direction.
6. The integrated, combined purifier of claim 5, wherein: the tower body is provided with a plurality of observation holes.
7. The integrated, combined purifier of claim 5, wherein: and a wind shield is arranged in the third air inlet, and a plurality of vent holes are uniformly formed in the wind shield.
8. The integrated, modular purifier of claim 1, wherein: and a demisting device is arranged in the third air outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020389305.7U CN212091693U (en) | 2020-03-24 | 2020-03-24 | Integrated combined purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020389305.7U CN212091693U (en) | 2020-03-24 | 2020-03-24 | Integrated combined purifier |
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| CN212091693U true CN212091693U (en) | 2020-12-08 |
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| CN202020389305.7U Expired - Fee Related CN212091693U (en) | 2020-03-24 | 2020-03-24 | Integrated combined purifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114028940A (en) * | 2021-11-25 | 2022-02-11 | 江南大学 | Assembled organic pollution waste gas treatment device and method |
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2020
- 2020-03-24 CN CN202020389305.7U patent/CN212091693U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114028940A (en) * | 2021-11-25 | 2022-02-11 | 江南大学 | Assembled organic pollution waste gas treatment device and method |
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