CN218608714U - Low concentration organic waste gas's adsorption concentration system - Google Patents
Low concentration organic waste gas's adsorption concentration system Download PDFInfo
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- CN218608714U CN218608714U CN202223212853.0U CN202223212853U CN218608714U CN 218608714 U CN218608714 U CN 218608714U CN 202223212853 U CN202223212853 U CN 202223212853U CN 218608714 U CN218608714 U CN 218608714U
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 102
- 239000007789 gas Substances 0.000 title claims abstract description 44
- 239000010815 organic waste Substances 0.000 title claims abstract description 21
- 238000003795 desorption Methods 0.000 claims abstract description 43
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 19
- 239000010457 zeolite Substances 0.000 claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims abstract description 7
- 239000002808 molecular sieve Substances 0.000 claims abstract description 7
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000000274 adsorptive effect Effects 0.000 claims 3
- 239000002912 waste gas Substances 0.000 abstract description 23
- 238000001816 cooling Methods 0.000 abstract description 8
- 239000010908 plant waste Substances 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 230000008929 regeneration Effects 0.000 description 5
- 238000011069 regeneration method Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000002336 sorption--desorption measurement Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
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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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- Separation Of Gases By Adsorption (AREA)
Abstract
The utility model discloses a low concentration organic waste gas's concentrated system of absorption, including the cold defogging all-in-one of table, adsorption tank, adsorption tube way, exhaust duct and desorption pipeline. The air inlet end of the adsorption pipeline is connected with an air outlet of the surface cooling and demisting integrated machine, and the air outlet end of the adsorption pipeline is connected with an air inlet at the lower end of the adsorption box; an air outlet at the upper end of the adsorption box is connected with an exhaust pipeline; the desorption pipeline is connected with a desorption air outlet at the lower end of the adsorption box. The organic tail gas with high temperature, high humidity and low concentration is firstly cooled by a surface cooler, water vapor in the waste gas is removed by a demister after the temperature is reduced, and then the organic tail gas enters a zeolite bed in an adsorption box to be adsorbed and discharged in high altitude after reaching the standard; and the desorbed high-concentration waste gas is merged into a plant waste gas collecting main pipe and is connected to an RTO system for deep treatment. The utility model discloses an adsorb concentrated system can carry out high-efficient purification to the organic waste gas of high temperature, high humidity, low concentration, and the operation safety and stability, zeolite molecular sieve in the zeolite bed can be regenerated, therefore the running cost is low.
Description
Technical Field
The utility model relates to a tail gas treatment field, concretely relates to low concentration organic waste gas's concentrated system of absorption.
Background
Organic waste gas (such as toluene, xylene, methanol, acetone, dichloromethane and the like) pretreated in a drying workshop has the characteristics of large air quantity, low concentration, high temperature, strong fluctuation and extremely large moisture content, and occasionally exceeds the standard, and most of the organic waste gas slightly exceeds the standard.
Because the air volume of the waste gas is large and the concentration is low, condensation and membrane separation are not suitable to be adopted; the removal efficiency of biological methods, low-temperature plasma or photocatalytic oxidation and the like is also low, and the related emission standard cannot be met after treatment under the condition of large exceeding standard; a large amount of solid waste is generated by adopting a common activated carbon adsorption method, and the solid waste is not suitable for replacement; the thermal oxidation method has high investment and operation cost and poor economical efficiency; in addition, the waste gas is subjected to secondary carbon fiber adsorption-desorption recovery, and the recovery significance is not large.
For a treatment method of high-temperature and low-concentration organic waste gas, chinese patent document CN 109045934A (application number 201810938972.3) discloses an adsorption device and method for ultralow emission of VOCs, which includes a main blower, a pretreatment device, an adsorption circulation pipeline, at least two adsorbers connected in parallel and a desorption system, wherein the pretreatment device is used for cooling and filtering the waste gas, and the pretreatment device, the main blower and the adsorber used for adsorbing the waste gas are sequentially connected through a pipeline. The device comprises an adsorption circulation pipeline, at least two adsorbers and a desorption system which are connected in parallel, wherein each adsorber is connected through the adsorption circulation pipeline; the waste gas is subjected to primary adsorption treatment by one or more adsorbers, and then enters the rest one or more adsorbers through the adsorption circulation pipeline to continue to perform secondary adsorption treatment, wherein the waste gas is continuously subjected to adsorption treatment until the adsorbers are saturated after the adsorbers are penetrated, and the desorption system is used for desorbing the saturated adsorbers. In the pretreatment device, the temperature of the VOCs waste gas is adjusted to 0-40 ℃, the waste gas is neutralized and adjusted to be neutral through acid and alkali, dust in the waste gas is filtered, the dust content is less than 5ppm, moisture in the waste gas is removed, and the water content of the waste gas is not more than 50%; and (4) introducing the pretreated waste gas into an adsorber for adsorption treatment.
Chinese patent document CN213699426U (application number 202022129804.5) discloses a low concentration waste gas treatment device for sewage plant, which comprises: the device comprises an alkaline tower, a demister, a surface cooler, an adsorption tank and a washing tower, wherein an inlet of the alkaline tower is connected with an exhaust gas source, an outlet of the alkaline tower is connected with an inlet of the demister, an outlet of the demister is connected with an inlet of the surface cooler, an outlet of the surface cooler is connected with an inlet of the adsorption tank, and an exhaust gas outlet of the adsorption tank is connected with an inlet of the washing tower.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a low concentration organic waste gas's that simple structure, cost are lower adsorption concentration system is provided.
Realize the technical scheme of the utility model is a low concentration organic waste gas's concentrated system of absorption, including cold defogging all-in-one of table, adsorption tank, adsorption tube way, exhaust duct and desorption pipeline.
The surface cooling and demisting integrated machine comprises a shell, a surface cooler and a demister, wherein the surface cooler and the demister are integrally installed in the shell; the shell includes air intake and air outlet, and the surface cooler is located the rear of air intake, and the defroster is located the rear of surface cooler, and the air outlet is located the rear of defroster.
A zeolite bed is arranged in the adsorption tank, and the lower end of the adsorption tank is provided with an air inlet and a desorption air outlet; the upper end is provided with an air outlet and a hot air inlet; the air inlet end of the adsorption pipeline is connected with the air outlet of the surface cooling and demisting all-in-one machine, and the air outlet end of the adsorption pipeline is connected with the air inlet at the lower end of the adsorption box; an air outlet at the upper end of the adsorption box is connected with an exhaust pipeline; a hot air inlet at the upper end of the adsorption box is connected with a hot air pipeline; the desorption pipeline is connected with a desorption air outlet at the lower end of the adsorption box.
Further, the system also comprises a chimney blower and an RTO system blower; the chimney blower is connected with the exhaust pipeline above the adsorption box through a pipeline; send RTO system fan to pass through the pipeline and be connected with the desorption pipeline of adsorption tank below.
Still set up the shower nozzle in the integrative machine of table cold defogging, the shower nozzle setting is in the both sides of defroster, and the shower nozzle passes through the pipe connection water tank. And after the demister is used for a period of time, opening the spray nozzle to clean the demister.
The adsorption tanks are provided with two or more adsorption tanks, and the lower end air inlet of each adsorption tank is connected with the surface cooling and demisting integrated machine through an adsorption pipeline; an air outlet at the upper end of each adsorption box is connected with an exhaust pipeline; a desorption gas outlet at the lower end of each adsorption box is connected with a desorption pipeline; the adsorption pipeline, the exhaust pipeline and the desorption pipeline are respectively provided with a valve. After two or more than two adsorption tanks are arranged, adsorption and desorption can be carried out in different adsorption tanks simultaneously, and the continuity of system operation is ensured.
And the surface cooler is internally connected with circulating cooling water.
Optionally, the demister is a wire mesh demister.
The adsorbent material in the adsorption box is zeolite molecular sieve.
The utility model discloses has positive effect:
(1) The utility model discloses a concentrated system's of absorption processing object is the organic waste gas of high temperature, high humidity, low concentration, according to this type of organic tail gas's operating mode characteristic, considers the suitability of all kinds of technical method, the utility model discloses a concentrated system of absorption adopts the technology of "cooling + defogging + concentration of absorption + thermal oxidation".
The organic tail gas with high temperature, high humidity and low concentration is firstly cooled by a surface cooler, water vapor in the waste gas is removed by a demister after the temperature is reduced, and then the organic tail gas enters a zeolite bed in an adsorption box to be adsorbed and discharged in high altitude after reaching the standard; the zeolite bed is adsorbed and saturated and then is regenerated by adopting hot air and electric heating, the installed capacity and the operating cost can be effectively reduced by adopting a hot air and electric auxiliary heat regeneration mode, and desorbed high-concentration waste gas is merged into a plant waste gas collecting main pipe and is connected into an RTO system for deep treatment.
(2) The utility model discloses an adsorb concentrated system and set up three adsorption tank, adopt three beds two to inhale one and take off technology, three adsorption tank automatic switch regeneration, efficiency is stable. After the zeolite molecular sieve is adsorbed, high-temperature regeneration (usually 300 ℃) can be carried out according to actual conditions, and high-boiling-point substances are desorbed, so that the adsorption capacity of the zeolite molecular sieve is recovered.
(3) The utility model discloses an adsorb concentrated system can carry out high-efficient purification to the organic waste gas of high temperature, high humidity, low concentration, and operation safety and stability, zeolite molecular sieve in the zeolite bed can be regenerated, therefore the running cost is low.
Drawings
Fig. 1 is a schematic structural diagram of the adsorption concentration system of the present invention.
The reference numbers in the above figures are as follows: the device comprises a surface cooler 1, a demister 2, a spray head 3, an adsorption tank 4, a zeolite bed 4-1, an adsorption pipeline 5, an exhaust pipeline 6, a desorption pipeline 7, a chimney conveying fan 8 and an RTO system conveying fan 9.
Detailed Description
(example 1)
Referring to fig. 1, the adsorption concentration system for low concentration organic waste gas in the embodiment includes a surface cooling-demisting all-in-one machine, an adsorption tank 4, an adsorption pipeline 5, an exhaust pipeline 6, a desorption pipeline 7, a chimney-feeding fan 8 and an RTO-feeding system fan 9.
The surface cooling-defogging integrated machine comprises a shell, a surface cooler 1, a defogger 2 and a spray head 3, wherein the surface cooler 1, the defogger 2 and the spray head 3 are integrally installed in the shell. The shell includes air intake and air outlet, and surface cooler 1 is located the rear of air intake, and defroster 2 is located the rear of surface cooler 1, and the air outlet is located the rear of defroster 2. Shower nozzle 3 sets up in the both sides of defroster 2, and shower nozzle 3 passes through the pipe connection clear water tank, uses a period back at defroster 2, opens shower nozzle 3 and washs defroster 2.
After entering the surface cooling-demisting integrated machine, the waste gas is firstly cooled by the surface cooler 1, then dehumidified by the demister 2, and then enters the adsorption tank 4.
And the surface cooler 1 is internally connected with circulating cooling water. The demister 2 in this embodiment is a wire mesh demister.
A zeolite bed 4-1 is arranged in the adsorption box 4, and the adsorption material in the zeolite bed 4-1 is a zeolite molecular sieve, which is crystalline aluminosilicate in the embodiment. The lower end of the adsorption box 4 is provided with an air inlet and a desorption air outlet; the upper end is provided with an air outlet and a hot air inlet.
The air inlet end of the adsorption pipeline 5 is connected with the air outlet of the surface cooling-defogging all-in-one machine, and the air outlet end of the adsorption pipeline 5 is connected with the air inlet at the lower end of the adsorption box 4. An air outlet at the upper end of the adsorption box 4 is connected with an exhaust pipeline 6, and the exhaust pipeline 6 is connected with a chimney conveying fan 8.
The lower extreme at adsorption tank 4 sets up the desorption gas outlet, and desorption pipeline 7 is connected with the desorption gas outlet of adsorption tank 4 lower extreme, and desorption pipeline 7 is connected with send RTO system fan 9.
The adsorption tanks 4 are two or more than two, three in this embodiment, and the lower air inlet of each adsorption tank 4 is connected with the surface cooling-defogging all-in-one machine through an adsorption pipeline 5. An air outlet at the upper end of each adsorption box 4 is connected with an exhaust pipeline 6, and the treated gas meeting the emission requirement is exhausted out of the system through a chimney conveying fan 8. The desorption gas outlet at the lower end of each adsorption box 4 is connected with a desorption pipeline 7, and the desorbed gas is sent into the RTO system through a fan 9 of the RTO system. The adsorption pipeline 5, the exhaust pipeline 6 and the desorption pipeline 7 are respectively provided with a valve.
In this embodiment, after three adsorption tanks 4 are provided, a three-bed two-adsorption one-desorption process is adopted for operation.
Namely, the three adsorption boxes 4 are respectively called A, B and C, the gas treated by the surface cooling-demisting integrated machine is firstly sent to A and B at the same time, at the moment, C is in a waiting state, and is discharged from the exhaust pipeline 6 after being adsorbed and purified by A and B.
After the A and the B are adsorbed for a certain time, the valves are automatically switched, the gas of the waste gas treated by the surface cooling-demisting all-in-one machine is simultaneously sent into the B and the C, and is exhausted from an exhaust pipeline 6 after being adsorbed and purified by the A and the B; a gets into desorption state, opens the valve on desorption pipeline 7 during the desorption, adopts hot-air + electricity to assist the heat regeneration mode, and hot-air gets into adsorption tank 4 (not drawn in the picture) from the top, thereby the high enriched waste gas after the desorption gets into desorption pipeline 7 and gets into the RTO system from adsorption tank 4 below. And after the desorption is finished, the desorption valve is automatically closed, and the cooling waiting state is entered.
B and C are adsorbed for a certain time, the valves are automatically switched, the gas of the waste gas treated by the surface cooling-demisting integrated machine is simultaneously fed into C and A, and B enters a desorption state; the adsorption-desorption manner is the same as above. Then circulating according to the sequence of AB-BC-CA-AB \8230.
The valve is controlled by PLC to switch and to reciprocate and switch automatically. Special cases may also be manually switched.
The utility model discloses an adsorb concentrated system is applicable to high temperature, high wet, low concentration organic waste gas's purification, adopts the technology of "cooling + defogging + adsorption concentration + thermal oxidation".
The organic tail gas with high temperature, high humidity and low concentration is firstly cooled by a surface cooler, water vapor in the waste gas is removed by a demister after the temperature is reduced, and then the organic tail gas enters a zeolite bed in an adsorption box to be adsorbed and discharged in high altitude after reaching the standard; after the zeolite bed is saturated in adsorption, hot air and electric heating are adopted for regeneration, desorbed high-concentration waste gas enters a desorption pipeline 7 from the lower part of the adsorption box 4 and is merged into a plant waste gas collecting main pipe, and an 'RTO' system is accessed for deep treatment.
Claims (7)
1. The utility model provides a concentrated system of absorption of low concentration organic waste gas which characterized in that: comprises a surface cooling-demisting integrated machine, an adsorption box (4), an adsorption pipeline (5), an exhaust pipeline (6) and a desorption pipeline (7);
the surface cooling-defogging integrated machine comprises a shell, a surface cooler (1) and a defogger (2), wherein the surface cooler (1) and the defogger (2) are integrally installed in the shell; the shell comprises an air inlet and an air outlet, the surface air cooler (1) is positioned behind the air inlet, the demister (2) is positioned behind the surface air cooler (1), and the air outlet is positioned behind the demister (2);
a zeolite bed (4-1) is arranged in the adsorption tank (4), and an air inlet and a desorption air outlet are arranged at the lower end of the adsorption tank (4); the upper end is provided with an air outlet and a hot air inlet; the air inlet end of the adsorption pipeline (5) is connected with an air outlet of the surface cooling-demisting integrated machine, and the air outlet end of the adsorption pipeline is connected with an air inlet at the lower end of the adsorption box (4); an air outlet at the upper end of the adsorption box (4) is connected with an exhaust pipeline (6); a hot air inlet at the upper end of the adsorption box (4) is connected with a hot air pipeline; the desorption pipeline (7) is connected with a desorption air outlet at the lower end of the adsorption box (4).
2. The system for adsorbing and concentrating the low-concentration organic waste gas as claimed in claim 1, wherein: the system also comprises a chimney air blower (8) and an RTO system air blower (9); the chimney-conveying fan (8) is connected with an exhaust pipeline (6) above the adsorption box (4) through a pipeline; and a blower (9) of the RTO system is connected with a desorption pipeline (7) below the adsorption tank (4) through a pipeline.
3. The system for adsorbing and concentrating the low-concentration organic waste gas as claimed in claim 1, wherein: the table cooling-demisting integrated machine is also internally provided with spray heads (3), the spray heads (3) are arranged on two sides of the demister (2), and the spray heads (3) are connected with the water tank through pipelines.
4. The system for adsorbing and concentrating the low-concentration organic waste gas as claimed in claim 2, wherein: the adsorption tanks (4) are arranged in two or more than two, and the lower air inlet of each adsorption tank (4) is connected with the surface cooling-demisting all-in-one machine through an adsorption pipeline (5); an air outlet at the upper end of each adsorption box (4) is connected with an exhaust pipeline (6); a desorption gas outlet at the lower end of each adsorption box (4) is connected with a desorption pipeline (7); valves are respectively arranged on the adsorption pipeline (5), the exhaust pipeline (6) and the desorption pipeline (7).
5. The system for adsorptive concentration of low concentration organic waste gas according to claim 1, wherein: the surface cooler (1) is internally connected with circulating cooling water.
6. The system for adsorptive concentration of low concentration organic waste gas according to claim 1, wherein: the demister (2) is a wire mesh demister.
7. The system for adsorptive concentration of low concentration organic waste gas according to claim 1, wherein: the adsorption material in the adsorption box (4) is zeolite molecular sieve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223212853.0U CN218608714U (en) | 2022-11-30 | 2022-11-30 | Low concentration organic waste gas's adsorption concentration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223212853.0U CN218608714U (en) | 2022-11-30 | 2022-11-30 | Low concentration organic waste gas's adsorption concentration system |
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| CN218608714U true CN218608714U (en) | 2023-03-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116510503A (en) * | 2023-04-04 | 2023-08-01 | 青岛诺诚化学品安全科技有限公司 | Dynamic high-efficiency treatment equipment and method for VOCs in oil separation tank |
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2022
- 2022-11-30 CN CN202223212853.0U patent/CN218608714U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116510503A (en) * | 2023-04-04 | 2023-08-01 | 青岛诺诚化学品安全科技有限公司 | Dynamic high-efficiency treatment equipment and method for VOCs in oil separation tank |
| CN116510503B (en) * | 2023-04-04 | 2024-03-19 | 青岛诺诚化学品安全科技有限公司 | Dynamic high-efficiency treatment equipment and method for VOCs in oil separation tank |
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Address after: No. 18 Haiyou Road, Yangkou Town, Rudong County, Nantong City, Jiangsu Province, 226400 Patentee after: Jiangsu Ruibang agrochemical Co.,Ltd. Country or region after: China Address before: 226400 18 Haibin 2nd Road, Rudong Coastal Economic Development Zone, Rudong County, Nantong City, Jiangsu Province Patentee before: Jiangsu Ruibang agrochemical Co.,Ltd. Country or region before: China |
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