CN221062202U - VOCs exhaust treatment system - Google Patents
VOCs exhaust treatment system Download PDFInfo
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- CN221062202U CN221062202U CN202322967588.5U CN202322967588U CN221062202U CN 221062202 U CN221062202 U CN 221062202U CN 202322967588 U CN202322967588 U CN 202322967588U CN 221062202 U CN221062202 U CN 221062202U
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- waste gas
- electromagnetic valve
- purifying
- vocs
- pipe
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 56
- 239000002912 waste gas Substances 0.000 claims abstract description 63
- 239000007789 gas Substances 0.000 claims abstract description 38
- 238000007084 catalytic combustion reaction Methods 0.000 claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000011084 recovery Methods 0.000 claims abstract description 27
- 238000000746 purification Methods 0.000 claims abstract description 18
- 238000003795 desorption Methods 0.000 claims abstract description 17
- 238000007599 discharging Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 abstract description 14
- 229920006395 saturated elastomer Polymers 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000000197 pyrolysis Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 208000024172 Cardiovascular disease Diseases 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 208000023504 respiratory system disease Diseases 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The utility model relates to the technical field of waste gas treatment, and particularly discloses a VOCs waste gas treatment system which comprises a waste gas conveying structure, a waste gas purifying structure, a purifying structure desorption structure and a purified gas discharge tower, wherein the waste gas conveying structure comprises a draught fan and a waste gas input pipe which is communicated with the output end of the draught fan. According to the technical scheme, the adsorption saturation degree of the purifying tank is monitored through the VOCs concentration sensor, when the adsorption saturation of the purifying tank is carried out, the value monitored by the VOCs concentration sensor can be increased, the electromagnetic valve A and the electromagnetic valve C are closed, the electromagnetic valve D and the electromagnetic valve B are opened, the catalytic combustion chamber is matched with the heat recovery chamber to desorb and activate the activated carbon adsorbed and saturated in the purifying tank, the two purifying tanks are arranged to ensure that one tank body is purified and the other tank body is desorbed and activated, and the effects of waste gas purification and desorption are achieved, so that the waste gas treatment efficiency of the device is improved.
Description
Technical Field
The utility model relates to the technical field of waste gas treatment, in particular to a VOCs waste gas treatment system.
Background
Paint plants currently use paints and solvents containing Volatile Organic Compounds (VOCs) which volatilize into the air during the spraying process to form exhaust gases which, if not treated effectively, may be harmful to the environment and to human health, since VOCs are an air pollutant which reacts with nitrogen oxides (NOx) to form secondary pollutants such as ozone and fine particles which are potentially harmful to the air quality and to human health, for example, respiratory diseases, cardiovascular diseases, cancer, etc. Therefore, it is important to take effective treatment measures for VOCs waste gas in a paint shop. Common methods of treatment include the use of VOCs recovery units, the use of thermal oxidation equipment, the use of adsorbent materials, and the like. The methods can effectively reduce the emission of VOCs waste gas. When the adsorption material is used for adsorbing VOCs, the adsorption material can reach a saturation state, if the adsorption material is not found in time at this moment, the uncleaned VOCs waste gas can directly pass through the adsorption structure, so that the situation of VOCs waste gas direct emission is caused, and therefore, the saturation degree of the adsorption structure needs to be monitored, and an adsorption material desorption activation structure which does not stop waste gas purification work needs to be designed, because the time for stopping waste gas purification work to desorb and activate the adsorption material is longer, the efficiency of waste gas purification can be influenced, and therefore, a VOCs waste gas treatment system is proposed.
Disclosure of utility model
The utility model aims to provide a VOCs waste gas treatment system, which solves the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the VOCs waste gas treatment system comprises a waste gas conveying structure, a waste gas purifying structure, a purifying structure desorption structure and a purified gas discharge tower, wherein the waste gas conveying structure comprises a draught fan and a waste gas input pipe which is communicated with the output end of the draught fan;
The waste gas purifying structure comprises two groups of purifying tanks with the same size, wherein the input end of the purifying tank is communicated with a three-way pipe A, the output end of the purifying tank is communicated with a three-way pipe B, two inlet pipes of the three-way pipe A are respectively communicated with an electromagnetic valve A and an electromagnetic valve B, two outlet pipes of the three-way pipe B are respectively communicated with an electromagnetic valve C and an electromagnetic valve D, the input end of the purifying gas discharging tower is communicated with a waste gas output pipe, the electromagnetic valve C is communicated with the waste gas output pipe, a VOCs concentration sensor is arranged between the electromagnetic valve C and the waste gas output pipe in series connection, and the electromagnetic valve A is communicated with the waste gas input pipe;
The purification structure desorption structure includes catalytic combustion cavity, catalytic combustion cavity below is fixed to be provided with the heat recovery cavity, catalytic combustion cavity outside is fixed to be provided with the combustor, catalytic combustion cavity top intercommunication is provided with three way connection A, solenoid valve B's one end is connected with three way connection A intercommunication through the pipeline, the inside heat exchange pipeline that is provided with of heat recovery cavity, the heat exchange pipeline is connected with catalytic combustion cavity respectively, purifying gas discharges the tower intercommunication, the outside fixed air heater and the controller of being provided with of heat recovery cavity, air heater's output intercommunication is provided with three way connection B, three way connection B's output interface is connected with solenoid valve D intercommunication through the pipeline.
As a preferred implementation mode of the technical scheme of the application, the heat exchange pipeline is a spiral pipeline, and the input end of the air heater is communicated and connected with the inside of the heat recovery cavity.
As a preferred implementation mode of the technical scheme of the application, the input end of the heat exchange pipeline is communicated and connected with the catalytic combustion chamber through the bent pipe A, and the output end of the heat exchange pipeline is communicated and connected with the purified gas discharge tower through the bent pipe B.
As a preferred embodiment of the technical solution of the present application, the catalytic combustion chamber is separated from the heat recovery chamber by a heat insulating plate.
As a preferred implementation mode of the technical scheme of the application, the purifying tank is internally filled with a plurality of honeycomb activated carbon plates which are vertically stacked.
As a preferred embodiment of the technical scheme of the application, the side wall of the purification tank is fixedly provided with a sealing cover through bolts.
Compared with the prior art, the utility model has the following beneficial effects:
1. According to the technical scheme, the adsorption saturation degree of the purifying tank is monitored through the VOCs concentration sensor, when the adsorption saturation of the purifying tank is carried out, the value monitored by the VOCs concentration sensor can be increased, the electromagnetic valve A and the electromagnetic valve C are closed, the electromagnetic valve D and the electromagnetic valve B are opened, the catalytic combustion chamber is matched with the heat recovery chamber to desorb and activate the activated carbon adsorbed and saturated in the purifying tank, the two purifying tanks are arranged to ensure that one tank body is purified and the other tank body is desorbed and activated, and the effects of waste gas purification and desorption are achieved, so that the waste gas treatment efficiency of the device is improved.
2. According to the technical scheme, the organic waste gas generated by the desorption of the activated carbon is fully combusted through the catalytic combustion chamber, the generated high-temperature gas can heat the heat recovery chamber through the heat exchange pipeline, and the heat recovery chamber can convey hot air to the inside of the purification tank in cooperation with the hot air blower, so that the smooth and rapid desorption of the activated carbon is facilitated, and meanwhile, the heat energy generated by the catalytic combustion chamber is utilized, so that the effect of energy recycling is realized.
Drawings
Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a front view of a VOCs exhaust treatment system according to the present utility model;
fig. 2 is a cross-sectional view of the heat recovery chamber of the present utility model.
In the figure: 1. an induced draft fan; 2. an exhaust gas input pipe; 3. a solenoid valve A; 4. a solenoid valve B; 5. a three-way pipe A; 6. a purification tank; 7. a three-way pipe B; 8. a solenoid valve C; 9. a solenoid valve D; 10. VOCs concentration sensor; 11. an exhaust gas output pipe; 12. a gas discharge tower; 13. a catalytic combustion chamber; 14. a three-way joint A; 15. a combustion machine; 16. a controller; 17. a bent pipe A; 18. a heat recovery chamber; 19. a bent pipe B; 20. an air heater; 21. a three-way joint B; 22. and a heat exchange pipeline.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
Embodiment 1, as shown in fig. 1-2, the present utility model provides a technical solution: the VOCs waste gas treatment system comprises a waste gas conveying structure, a waste gas purifying structure, a purifying structure desorption structure and a purified gas discharge tower 12, wherein the waste gas conveying structure comprises a draught fan 1 and a waste gas input pipe 2 communicated with the output end of the draught fan 1;
The waste gas purifying structure comprises two groups of purifying tanks 6 with the same size, wherein a three-way pipe A5 is communicated with the input end of the purifying tank 6, a three-way pipe B7 is communicated with the output end of the purifying tank 6, an electromagnetic valve A3 and an electromagnetic valve B4 are respectively communicated with two inlet pipes of the three-way pipe A5, an electromagnetic valve C8 and an electromagnetic valve D9 are respectively communicated with two outlet pipes of the three-way pipe B7, a waste gas output pipe 11 is communicated with the input end of a purifying gas discharging tower 12, the electromagnetic valve C8 is communicated with the waste gas output pipe 11, a VOCs concentration sensor 10 is arranged between the electromagnetic valve C8 and the waste gas output pipe 11 in series connection, and the electromagnetic valve A3 is communicated with the waste gas input pipe 2;
The purification structure desorption structure includes catalytic combustion cavity 13, catalytic combustion cavity 13 below is fixed to be provided with heat recovery cavity 18, catalytic combustion cavity 13 outside is fixed to be provided with combustor 15, catalytic combustion cavity 13 top intercommunication is provided with three way connection A14, solenoid valve B4's one end is connected with three way connection A14 intercommunication through the pipeline, heat recovery cavity 18 inside is provided with heat exchange pipeline 22, heat exchange pipeline 22 respectively with catalytic combustion cavity 13, purification gas emission tower 12 intercommunication is connected, heat recovery cavity 18 outside is fixed to be provided with air heater 20 and controller 16, air heater 20's output intercommunication is provided with three way connection B21, three way connection B21's output interface is connected with solenoid valve D9 intercommunication through the pipeline.
In a specific embodiment of the utility model, the input end of the induced draft fan 1 is provided with a filtering structure for preliminary filtering of VOCs waste gas, so as to prevent particles of the VOCs waste gas from blocking micropores of activated carbon, the induced draft fan 1 is internally provided with a blower for pressurizing the VOCs waste gas, one purifying tank 6 is used in an initial state, the other tank body is standby, the standby purifying tank 6, the electromagnetic valve A3, the electromagnetic valve C8, the electromagnetic valve B4 and the electromagnetic valve D are all in a closed state, the electromagnetic valve A3 and the electromagnetic valve C8 of the operating purifying tank 6 are in a conducting state, the electromagnetic valve B4 and the electromagnetic valve D are in a closed state, the VOCs waste gas can adsorb toxic organic matters of the VOCs waste gas through a honeycomb activated carbon plate of the purifying tank 6 and finally flows to the gas discharge tower 12 through the VOCs concentration sensor 10 and the waste gas output pipe 11, the VOCs concentration sensor 10 is used for monitoring the VOCs concentration of the purified gas, and when the adsorption of the purifying tank 6 is saturated, the value monitored by the VOCs concentration sensor 10 can rise, after being processed by the controller 16, the electromagnetic valve A3 and the electromagnetic valve C8 of the purifying tank 6 which are running are automatically controlled to be switched to be in a closed state, the electromagnetic valve B4 and the electromagnetic valve D are in an open state, and the purifying tank 6 which is standby is opened, so that the electromagnetic valve A3 and the electromagnetic valve C8 of the purifying tank 6 which is standby are switched to be in an open state, the electromagnetic valve B4 and the electromagnetic valve D are still in a closed state, then the burner 15 and the hot air blower 20 are sequentially opened, the air in the catalytic combustion chamber 13 can be heated when the burner 15 is started, the heated air enters the heat exchange pipeline 22 through the bent pipe A17 and finally is discharged from the gas discharge tower 12 along the bent pipe B19, the heat recovery chamber 18 can be heated through the heat exchange pipeline 22, the heat recovery chamber 18 can be matched with the hot air blower 20 to convey hot air into the purifying tank 6, thereby carry out desorption activation to the inside saturated active carbon that adsorbs of purifying tank 6, inside hot-blast organic matter that carries the desorption got into catalytic combustion cavity 13, catalytic combustion cavity 13 is inside to set up the catalyst, the catalyst is used for combining with VOCs organic matter waste gas, the cooperation fully burns, make into carbon dioxide and water, the catalyst can be noble metal catalysts such as copper oxide, manganese oxide, cobalt oxide, can promote VOCs's pyrolysis reaction under high temperature condition, VOCs waste gas pyrolysis produces heat energy carries out heat energy utilization through heat transfer pipeline 22 again, finally follow return bend B19 and discharge from gas emission tower 12, this purification structure desorption structure is not only favorable to active carbon to following fast desorption, simultaneously utilize the heat energy that catalytic combustion cavity 13 produced, realize energy recycle's effect.
In the preferred technical scheme, the heat exchange pipeline 22 is a spiral pipeline, the input end of the air heater 20 is connected with the inside of the heat recovery chamber 18 in a communicated manner, and the spiral pipeline is beneficial to the interaction between the heat and the heat exchange pipeline 22, so that the heat is fully utilized.
In the preferred technical scheme, the input end of the heat exchange pipeline 22 is connected with the catalytic combustion chamber 13 in a communicating way through the bent pipe A17, the output end of the heat exchange pipeline 22 is connected with the purified gas discharge tower 12 in a communicating way through the bent pipe B19, the catalytic combustion chamber 13 is separated from the heat recovery chamber 18 through a heat insulation plate, the catalytic combustion chamber 13 is mainly used for burning the VOCs waste gas after thermal desorption, and the catalytic combustion chamber 13 needs to be separated from the heat recovery chamber 18, so that the desorbed VOCs waste gas is prevented from being directly sucked into the purifying tank 6.
In the preferred technical scheme, the purification tank 6 is internally filled with a plurality of honeycomb activated carbon plates, micropores of the honeycomb activated carbon plates are beneficial to adsorbing harmful micromolecular substances of VOCs waste gas, and the adsorption effect can be improved through vertical stacking of the plurality of honeycomb activated carbon plates.
In the preferred technical scheme, the side wall of the purification tank 6 is fixedly provided with a sealing cover through bolts, and the sealing cover is arranged to facilitate replacement of the honeycomb activated carbon plate.
Working principle: the induced draft fan 1 is used for pressurizing the VOCs waste gas, in an initial state, one purifying tank 6 is used, the other tank body is standby, the electromagnetic valve A3 and the electromagnetic valve C8 of the purifying tank 6 which are in operation are in a conducting state, the electromagnetic valve B4 and the electromagnetic valve D are in a closing state, the VOCs waste gas passes through the honeycomb activated carbon plate of the purifying tank 6, can adsorb toxic organic matters of the VOCs waste gas, and finally flows to the gas discharge tower 12 to be discharged through the VOCs concentration sensor 10 and the waste gas output pipe 11, the VOCs concentration sensor 10 is used for monitoring the VOCs concentration of the purifying gas, when the adsorption of the purifying tank 6 is saturated, the value monitored by the VOCs concentration sensor 10 is increased, after the purifying tank 6 is processed by the controller 16, the electromagnetic valve A3 and the electromagnetic valve C8 of the purifying tank 6 which are in operation are automatically controlled to be in a closing state, the electromagnetic valve B4 and the electromagnetic valve D are in an opening state, and the purifying tank 6 which is in standby is opened, then the combustion machine 15 and the air heater 20 are sequentially started, when the combustion machine 15 is started, the air in the catalytic combustion chamber 13 can be heated, the heated air enters the heat exchange pipeline 22 through the bent pipe A17 and finally is discharged from the gas discharge tower 12 along the bent pipe B19, the high-temperature gas can heat the heat recovery chamber 18 through the heat exchange pipeline 22, the heat recovery chamber 18 is matched with the air heater 20 to convey hot air into the purification tank 6, so that the activated carbon adsorbed and saturated in the purification tank 6 is desorbed and activated, the desorbed organic matters are carried by the hot air into the catalytic combustion chamber 13, a catalyst is arranged in the catalytic combustion chamber 13 and used for being combined with VOCs organic matter waste gas to be fully combusted in a matched mode, so that the pyrolysis is carried out into carbon dioxide and water, and the heat energy generated by the pyrolysis of the VOCs waste gas is utilized through the heat exchange pipeline 22 again, finally discharged from the gas discharge tower 12 along the bent pipe B19.
Claims (6)
1. VOCs exhaust-gas treatment system, its characterized in that: the device comprises an exhaust gas conveying structure, an exhaust gas purifying structure, a purifying structure desorption structure and a purified gas discharging tower (12), wherein the exhaust gas conveying structure comprises an induced draft fan (1) and an exhaust gas input pipe (2) which is communicated with the output end of the induced draft fan (1);
The waste gas purifying structure comprises two groups of purifying tanks (6) with the same size, wherein a three-way pipe A (5) is arranged at the input end of the purifying tanks (6) in a communicating way, a three-way pipe B (7) is arranged at the output end of the purifying tanks (6) in a communicating way, an electromagnetic valve A (3) and an electromagnetic valve B (4) are respectively arranged at two inlet pipes of the three-way pipe A (5) in a communicating way, an electromagnetic valve C (8) and an electromagnetic valve D (9) are respectively arranged at two outlet pipes of the three-way pipe B (7) in a communicating way, a waste gas output pipe (11) is arranged at the input end of the purifying gas discharging tower (12) in a communicating way, the electromagnetic valve C (8) is connected with the waste gas output pipe (11) in a communicating way, a VOCs concentration sensor (10) is arranged between the electromagnetic valve C (8) and the waste gas output pipe (11) in a communicating way, and the electromagnetic valve A (3) is connected with the waste gas input pipe (2);
The purification structure desorption structure comprises a catalytic combustion chamber (13), a heat recovery chamber (18) is fixedly arranged below the catalytic combustion chamber (13), a combustor (15) is fixedly arranged outside the catalytic combustion chamber (13), a tee joint A (14) is arranged at the top of the catalytic combustion chamber (13) in a communicating mode, one end of a solenoid valve B (4) is communicated with the tee joint A (14) through a pipeline, a heat exchange pipeline (22) is arranged inside the heat recovery chamber (18), the heat exchange pipeline (22) is respectively communicated and connected with the catalytic combustion chamber (13) and a purification gas discharge tower (12), an air heater (20) and a controller (16) are fixedly arranged outside the heat recovery chamber (18), a tee joint B (21) is arranged at the output end of the air heater (20) in a communicating mode, and an output interface of the tee joint B (21) is communicated and connected with a solenoid valve D (9) through a pipeline.
2. A VOCs exhaust gas treatment system according to claim 1, wherein: the heat exchange pipeline (22) is a spiral pipeline, and the input end of the air heater (20) is communicated and connected with the inside of the heat recovery cavity (18).
3. A VOCs exhaust gas treatment system according to claim 1, wherein: the input end of the heat exchange pipeline (22) is communicated and connected with the catalytic combustion chamber (13) through the bent pipe A (17), and the output end of the heat exchange pipeline (22) is communicated and connected with the purified gas discharge tower (12) through the bent pipe B (19).
4. A VOCs exhaust gas treatment system according to claim 1, wherein: the catalytic combustion chamber (13) is separated from the heat recovery chamber (18) by a heat insulating plate.
5. A VOCs exhaust gas treatment system according to claim 1, wherein: the purifying tank (6) is internally filled with a plurality of honeycomb activated carbon plates, and the honeycomb activated carbon plates are vertically stacked.
6. A VOCs exhaust gas treatment system according to claim 1, wherein: the side wall of the purifying tank (6) is fixedly provided with a sealing cover through bolts.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221062202U true CN221062202U (en) | 2024-06-04 |
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