CN220779725U - Device based on hollow fiber membrane fixed bed catalytic oxidation handles VOC - Google Patents
Device based on hollow fiber membrane fixed bed catalytic oxidation handles VOC Download PDFInfo
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- CN220779725U CN220779725U CN202321503721.5U CN202321503721U CN220779725U CN 220779725 U CN220779725 U CN 220779725U CN 202321503721 U CN202321503721 U CN 202321503721U CN 220779725 U CN220779725 U CN 220779725U
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- hollow fiber
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- 239000012528 membrane Substances 0.000 title claims abstract description 64
- 239000012510 hollow fiber Substances 0.000 title claims abstract description 25
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 22
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 21
- 230000003647 oxidation Effects 0.000 title claims abstract description 21
- 239000003054 catalyst Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003546 flue gas Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000000428 dust Substances 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 13
- 239000003973 paint Substances 0.000 abstract description 11
- 238000003795 desorption Methods 0.000 abstract description 6
- 238000001914 filtration Methods 0.000 abstract description 3
- 239000003595 mist Substances 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 239000007800 oxidant agent Substances 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 239000002893 slag Substances 0.000 abstract 1
- 239000012855 volatile organic compound Substances 0.000 description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 4
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid group Chemical group C(C1=CC=CC=C1)(=O)O WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 4
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000000443 aerosol Substances 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 3
- 238000009841 combustion method Methods 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 239000005711 Benzoic acid Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 235000010233 benzoic acid Nutrition 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 239000011329 calcined coke Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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)
Abstract
A device for treating VOC based on hollow fiber membrane fixed bed catalytic oxidation uses hollow fiber membrane filaments as filtering material to intercept powdery adsorption material to form powdery pretreatment material fixed bed, adsorbs oil mist and paint slag in flue gas, uses hollow fiber membrane filaments as filtering material to intercept powdery catalyst to form catalyst fixed bed, fills oxidant on the fixed bed, and treats VOC in flue gas by catalytic oxidation method, which has the advantages of high efficiency, energy saving, and cyclic desorption and catalyst renewal.
Description
Technical Field
A device for treating VOC based on hollow fiber membrane fixed bed catalytic oxidation.
Background
VOS (VOCs, TVOC) is produced from asphalt, rubber, paint, chemical, fuel oil, and other volatile matter production, storage, transportation, use processes, and fossil fuel combustion processes. The treatment technology mainly comprises active carbon adsorption, RTO and CTO heat storage combustion,
condensation, catalytic oxidation, etc., each characterized. However, this is always not desirable.
For example, the conventional water washing-electric capturing-activated carbon adsorption process commonly used at present for treating asphalt smoke has the defects of difficult achievement of actual effect, high activated carbon consumption and high cost, and the used activated carbon is treated as hazardous waste.
For example, at present, although the large-area popularization of the water-based paint is performed, the emission of smoke is far lower than legal indexes, and new projects still have difficulty in obtaining emission indexes due to the limitation of total emission.
For example, the conventional RTO and CTO heat storage combustion methods are difficult to maintain due to the fact that many processes are intermittent, a large amount of fuel is required to be consumed to maintain the temperature, and energy consumption is extremely high.
For example, VOCs are flammable and explosive materials that can be exploded with little care at high temperatures, and such accidents often occur.
The conventional VOC treatment technology commonly used at present has 5 defects of high energy consumption, high consumable material, low safety, low treatment precision, poor applicability and the like.
Against the background art, the utility model aims to solve the problems that: the energy consumption and the material consumption are smaller than those of RTO, CTO heat storage combustion method, condensation method and water washing-electric capturing-activated carbon adsorption system; the safety is better than that of RTO and CTO heat storage combustion method and than that of a water washing-electric capturing-activated carbon adsorption system; the processing precision is even lower than
2-4 mg/m, which is 10 times better than national standard; can be suitable for asphalt smoke, paint spraying, printing and dyeing, printing, chemical industry and other industries; an apparatus for treating VOCs based on catalytic oxidation of hollow fiber membranes can be used with both aqueous and oily paints.
Disclosure of Invention
The device for treating VOC based on hollow fiber membrane fixed bed catalytic oxidation comprises a main body part which is formed by sequentially and serially arranging a flue gas mixer (19), a preprocessor (11), a mixer (12), a first-stage membrane reactor (13), a second-stage membrane reactor (14), a fan and a chimney; the support system comprises a catalyst conveying system (15), a desorber (16) and a water scrubber (17); the essence is that: hollow fiber membrane components are arranged in the pretreatment device (11), the first-stage membrane reactor (13) and the second-stage membrane reactor (14); the surface of the hollow fiber membrane wire in the pretreatment device (11) is adsorbed with smoke pretreatment powdery material to form the fixed bed for smoke pretreatment; the surfaces of hollow fiber membrane filaments in the first-stage membrane reactor (13) and the second-stage membrane reactor (14) are adsorbed with powdery catalysts to form the fixed bed for catalytic oxidation; the inlet end of the preprocessor 11 is provided with a flue gas mixer (19) and a flue gas preprocessing material bin (10), the lower part of the preprocessor is provided with a blowing, spraying and stirring dust raising mechanism (21), the outlet end of the preprocessor is connected with the mixer (12), and the bottom of the preprocessor is provided with a powdery preprocessing material outlet; the catalyst conveying system 15 consists of a catalyst bin (22), a spent catalyst bin (23), a catalyst conveying pipe, a valve and a control system; the catalyst conveying system (15) is a screw conveying device or a pneumatic conveying device; under the operation of a control system, a catalyst conveying system (15) is connected with the inlet of the mixer (12), and fresh powdery catalyst enters the first-stage membrane reactor (13) through a catalyst bin (22) and the mixer (12); the catalyst conveying system (15) is connected with the discharge ports at the bottoms of the first-stage membrane reactor (13) and the second-stage membrane reactor (14) and the inlet end of the desorber (16) to form a channel for the catalyst to be desorbed to enter the desorber (16) from the bottoms of the first-stage membrane reactor (13) and the second-stage membrane reactor (14); the discharge end of the desorber (16) is respectively connected with the air inlet ends of the mixer (12) and the second-stage membrane reactor (14) through a conveying system (15), a channel for returning desorbed catalyst to the first-stage membrane reactor (13) and the second-stage membrane reactor (14) is formed, and the catalyst conveying system (15) is connected with a spent catalyst bin (23) to form a channel for discharging spent catalyst; the air outlet end of the desorber (16) is connected with the air inlet end of the water scrubber (17) through a pipeline to form a channel for the dehydrated air to enter the water scrubber (17); the air outlet end of the water scrubber (17) is connected with the mixer (12) through a pipeline to form a channel for the residual gas to return to the first-stage membrane reactor (13) again.
The utility model is an improvement on the patent of the inventor (ZL 202110120336.1), and the improvement points are as follows:
first, a preprocessor (11). Generally, the VOC treatment apparatus has a pre-treatment apparatus for removing oil mist and paint residues in the flue gas, and the conventional method includes electric capturing, water washing, aerosol cotton or aerosol cotton and cloth bag, and the two methods are adopted in the practical application of the (ZL 202110120336.1) patent, but the effect is poor, and even the subsequent catalytic oxidation effect is seriously affected.
To this end, the utility model proposes a new solution.
The hollow fiber membrane high-precision dust remover of (ZL 202110120336.1) patent has only dust removing function, and is improved in that powdery materials such as talcum powder, lime powder, bentonite, expanded graphite, calcined coke and the like are sprayed into a lower bin of the dust remover along with flue gas to serve as pretreatment materials, and a dust raising and compressed air spraying system is arranged at the bottom of the lower bin, so that the powdery materials form a dust suspension state in the lower bin of the dust remover, and oil absorption effect of the powdery pretreatment materials is utilized to adsorb oil mist and paint residues in the flue gas; powder cake is formed on the surface of the hollow fiber membrane yarn by using the powdery pretreatment material to form a fixed bed, so that the membrane yarn can be protected, the smoothness of the membrane yarn and the dust falling-off capability are maintained, oil stains can be adsorbed, and the powdery material for pretreatment is intercepted by using the excellent filtering effect of the hollow fiber membrane yarn; when the oil absorption of the sprayed pretreatment material is close to saturation, a back blowing system of the pretreatment device (11) is opened, and the pretreatment material adsorbed on the surface of the film wire is blown off; opening the bin bottom to remove saturated pretreatment materials; fresh pretreatment material is again sprayed.
The examination of the new products shows that only a pretreatment device for adsorption of a pleated filter element with a powdery material by using a film coating has not been reported in the past, and no report and precedent for pretreatment of VOC flue gas by using a hollow fiber membrane wire with a powdery material are available.
And secondly, a first-stage membrane reactor (13) and a second-stage membrane reactor (14).
And adsorbing the catalyst on the surface of the membrane wires to form a fixed bed. Ozone is sprayed into the lower bin as an oxidant, so that VOC in the flue gas and ozone are subjected to catalytic oxidation reaction on the surface of a catalyst, and the VOC is degraded into carbon dioxide and water, and the technology belongs to the content of ZL 202110120336.1. The improvement of the utility model in this link is: two-stage hollow fiber membrane filaments are used as a fixed bed membrane reactor.
Thirdly, a desorber (16) and a water scrubber (17).
In the practical use of the (ZL 202110120336.1) patent, the efficiency of the catalyst used was found to be progressively lower. The reason for this is that VOCs are simultaneously carried out along three paths in the catalytic oxidative degradation process, toluene is taken as an example, and one is directly degraded into carbon dioxide and water; one is benzoic acid which is degraded into refractory benzoic acid along benzyl alcohol-benzaldehyde; one is degradation to phenol, followed by disruption, and successive degradation to carboxylic acids, aldehydes, alcohols, etc., in practice, formic acid and acetic acid are the majority.
Continuing the catalytic oxidation, the final end result is carbon dioxide and water. However, these materials can adhere to the surface of the catalyst particles, resulting in a very low catalyst efficiency and eventual deactivation. This phenomenon has been observed and reported in a large number for a long time, and has become a consensus. However, there is always a lack of solution, which is a technical bottleneck restricting the oxidation of VOCs with catalysts.
The inventors noted that the toluene degradation process is a process from extremely water-soluble to water-soluble, and does not necessarily require catalytic oxidation to carbon dioxide and water, and that these acidic substances can be easily captured by stopping catalytic oxidation at the water-soluble stage and then by high-temperature desorption and water washing. Thus, a large amount of energy sources can be saved, and the treatment efficiency is improved.
If a catalyst with a certain adsorption capacity is adopted, substances which are difficult to oxidize are adsorbed and stuck at the same time of oxidation. The catalyst which is adsorbed and stuck with the substances difficult to oxidize is sent to be heated and desorbed, and the desorbed gas is treated by a water washing method, so that the effect of half effort can be achieved.
According to the principle, the utility model adopts the desorber 16 as a link for carrying out thermal desorption on the catalyst, and the water washing tower 17 as a link for intercepting and collecting the VOCs-containing gas generated by the thermal desorption. Because the air quantity generated by the two links is small, the ideal effect can be achieved by using a small device and energy. This is the most important improvement of the present utility model to the (ZL 202110120336.1) patent.
Fourth, system integration.
These innovations are organically organized into a complete set of systems, forming a new device.
Drawings
Fig. 1 is a schematic diagram of an example of the present utility model.
Detailed description of the preferred embodiments
And (3) experiment by a small experiment device. A pretreatment device for absorbing lime powder by a small hollow fiber membrane fixed bed is manufactured, the area of membrane wires is 1 square meter, and the amount of absorbed quicklime is 200g. The catalytic oxidation device of the adsorption catalyst of the fixed bed of the first-stage hollow fiber membrane is connected, the area of membrane wires is 1 square meter, 200g of the adsorption catalyst is sprayed into the oily paint, and the concentration of the imported VOC is kept at 170-230 mg/m. Ozone is filled, the concentration is 5g/m and the flow is 5m and the air quantity is 5m and the speed is 5 m. And the total air quantity is 10 m/h. 3. Co-spraying oil paint for one hour
100g. The increase in outlet VOC from 5.5mg/m of the solution to 46mg/m of the solution was measured by FID meter. Showing a decrease in catalyst efficiency. And back blowing, taking out the catalyst, and carrying out 120-degree thermal desorption. The desorbent was analyzed and 70% was acetic acid. The catalyst was again put in. The above process was repeated 9 times repeatedly without clear decay trend.
Medium-scale experiments. The pretreatment device for adsorbing lime powder by an empty fiber film fixed bed is manufactured, the film wire area is 198 square meters, and 180Kg of quicklime is adsorbed and raised. The catalytic oxidation device only uses a primary hollow fiber membrane fixed bed adsorption catalyst, the membrane wire area is 200 square meters, and the adsorption catalyst is 200Kg. The oily paint is sprayed after being filtered by a layer of aerosol cotton, and 31.366Kg of the oily paint is sprayed in the air for 13 hours.
Maintaining the inlet VOC concentration of 100-320 mg/m. Ozone is filled in, the concentration is 92.4g/m and the flow is 7.7 m/h.
The total air quantity is 2650 m/h. The outlet VOC concentration was increased from 4.0mg/m to 19.2 mg/m. By this date, cyclic desorption experiments were also performed.
According to the experience of the series connection of the experiments and the prior multi-stage hollow fiber membrane fixed bed adsorption catalyst catalytic oxidation device, the treatment precision is ideal if the two-stage hollow fiber membrane fixed bed adsorption catalyst catalytic oxidation device is adopted. Emissions far superior to the most stringent standards can be achieved.
Claims (1)
1. The device for treating VOC based on hollow fiber membrane fixed bed catalytic oxidation comprises a main body part which is formed by sequentially and serially arranging a flue gas mixer (19), a preprocessor (11), a mixer (12), a first-stage membrane reactor (13), a second-stage membrane reactor (14), a fan and a chimney; the support system comprises a catalyst conveying system (15), a desorber (16) and a water scrubber (17); the method is characterized in that: hollow fiber membrane components are arranged in the pretreatment device (11), the first-stage membrane reactor (13) and the second-stage membrane reactor (14); the surface of the hollow fiber membrane wire in the pretreatment device (11) is adsorbed with smoke pretreatment powdery material to form the fixed bed for smoke pretreatment; the surfaces of hollow fiber membrane filaments in the first-stage membrane reactor (13) and the second-stage membrane reactor (14) are adsorbed with powdery catalysts to form the fixed bed for catalytic oxidation; the inlet end of the preprocessor (11) is provided with a flue gas mixer (19) and a flue gas preprocessing material bin (10), the lower part of the preprocessor is provided with a blowing, spraying and stirring dust raising mechanism (21), the outlet end of the preprocessor is connected with the mixer (12), and the bottom of the preprocessor is provided with a powdery preprocessing material outlet; the catalyst conveying system (15) consists of a catalyst bin (22), a spent catalyst bin (23), a catalyst conveying pipe, a valve and a control system; the catalyst conveying system (15) is a screw conveying device or a pneumatic conveying device; under the operation of a control system, a catalyst conveying system (15) is connected with the inlet of the mixer (12), and fresh powdery catalyst enters the first-stage membrane reactor (13) through a catalyst bin (22) and the mixer (12); the catalyst conveying system (15) is connected with the discharge ports at the bottoms of the first-stage membrane reactor (13) and the second-stage membrane reactor (14) and the inlet end of the desorber (16) to form a channel for the catalyst to be desorbed to enter the desorber (16) from the bottoms of the first-stage membrane reactor (13) and the second-stage membrane reactor (14); the discharge end of the desorber (16) is respectively connected with the air inlet ends of the mixer (12) and the second-stage membrane reactor (14) through a conveying system (15), a channel for returning desorbed catalyst to the first-stage membrane reactor (13) and the second-stage membrane reactor (14) is formed, and the catalyst conveying system (15) is connected with a spent catalyst bin (23) to form a channel for discharging spent catalyst; the air outlet end of the desorber (16) is connected with the air inlet end of the water scrubber (17) through a pipeline to form a channel for the dehydrated air to enter the water scrubber (17); the air outlet end of the water scrubber (17) is connected with the mixer (12) through a pipeline to form a channel for the residual gas to return to the first-stage membrane reactor (13) again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321503721.5U CN220779725U (en) | 2023-06-14 | 2023-06-14 | Device based on hollow fiber membrane fixed bed catalytic oxidation handles VOC |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321503721.5U CN220779725U (en) | 2023-06-14 | 2023-06-14 | Device based on hollow fiber membrane fixed bed catalytic oxidation handles VOC |
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| CN220779725U true CN220779725U (en) | 2024-04-16 |
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| CN202321503721.5U Active CN220779725U (en) | 2023-06-14 | 2023-06-14 | Device based on hollow fiber membrane fixed bed catalytic oxidation handles VOC |
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| Country | Link |
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| CN (1) | CN220779725U (en) |
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2023
- 2023-06-14 CN CN202321503721.5U patent/CN220779725U/en active Active
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