CN217829454U - Dichloromethane tail gas treatment device - Google Patents
Dichloromethane tail gas treatment device Download PDFInfo
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- CN217829454U CN217829454U CN202221539678.3U CN202221539678U CN217829454U CN 217829454 U CN217829454 U CN 217829454U CN 202221539678 U CN202221539678 U CN 202221539678U CN 217829454 U CN217829454 U CN 217829454U
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Abstract
The utility model discloses a dichloromethane tail gas treatment device, which belongs to the technical field of waste gas treatment and comprises a pretreatment unit, a spraying unit and an adsorption unit which are connected in sequence, wherein the adsorption unit is connected with a desorption and analysis unit and a cooling unit; the pretreatment unit comprises a first surface cooler and a cryogenic device, the first surface cooler and the cryogenic device are arranged on a tail gas inlet pipeline, and a buffer tank is arranged between the first surface cooler and the cryogenic device; the spraying unit is connected with the adsorption unit through a first gas transmission pipeline, and a second surface cooler is arranged on the first gas transmission pipeline; the adsorption unit comprises a resin adsorption device and an active carbon adsorption device which are connected in series, the resin adsorption device and the active carbon adsorption device are communicated through a second gas transmission pipeline, and a third surface cooler and an adsorption fan are arranged on the second gas transmission pipeline; the utility model can realize the regeneration and utilization of the adsorbent, reduce the dosage of the adsorbent, improve the adsorption efficiency and treat the tail gas with high concentration; can reduce the energy consumption of tail gas treatment.
Description
Technical Field
The utility model relates to a dichloromethane tail gas processing apparatus belongs to exhaust-gas treatment technical field.
Background
The method aims at the problem that the adsorption recovery technology is the most widely adopted chemical waste gas at present, and the basic idea of treatment is to recycle and recycle the waste gas according to the resource attribute and the energy attribute of volatile gases of VOCs (volatile organic compounds). The principle of removing VOCs by adsorption is to use an adsorbent with a porous structure and a very large specific surface area to retain VOCs molecules. As the exhaust gas passes through the adsorbent bed, VOCs are adsorbed within the pores, thereby purifying the gas. The adsorption method is used for controlling the VOCs to be generally physical adsorption, the adsorption process is reversible, when the adsorption reaches saturation, the adsorbent can be desorbed by using water vapor, the gas-liquid mixture desorbed is condensed by a condenser, the VOCs are recovered, and the adsorbent can be recycled after regeneration. The adsorption effect depends primarily on the nature of the adsorbent, the type and concentration of the VOCs, and the operating temperature, humidity, pressure, etc. of the adsorption system. The key point of the adsorption method is adsorbent, and common adsorbents comprise granular activated carbon, activated carbon fiber, zeolite, molecular sieve, porous clay ore, activated alumina, silica gel, high polymer adsorption resin and the like.
At present, an adsorption system for treating dichloromethane waste gas has the defects of poor washing and adsorption efficiency, large adsorbent consumption, difficult regeneration, difficulty in treating high-concentration tail gas, high energy consumption and the like in actual production.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a dichloromethane tail gas treatment device aiming at the defects, which can realize the regeneration and utilization of the adsorbent, reduce the dosage of the adsorbent, improve the adsorption efficiency and treat the tail gas with high concentration; can reduce the energy consumption of tail gas treatment.
For solving the technical problem, the utility model adopts the following technical scheme: a dichloromethane tail gas treatment device comprises a pretreatment unit, a spraying unit and an adsorption unit which are sequentially connected, wherein the adsorption unit is also connected with a desorption and analysis unit and a cooling unit; the pretreatment unit comprises a first surface cooler and cryogenic equipment, the first surface cooler and the cryogenic equipment are arranged on a tail gas inlet pipeline, and a buffer tank is arranged between the first surface cooler and the cryogenic equipment; the spraying unit is connected with the adsorption unit through a first gas transmission pipeline, and a second surface cooler is arranged on the first gas transmission pipeline;
the adsorption unit comprises a resin adsorption device and an active carbon adsorption device which are connected in series, the resin adsorption device and the active carbon adsorption device are communicated through a second gas transmission pipeline, and a third surface cooler and an adsorption fan are arranged on the second gas transmission pipeline.
Further, the resin adsorption device comprises three resin adsorption tanks which are arranged in parallel; the activated carbon adsorption device comprises three activated carbon adsorption tanks which are arranged in parallel; desorption analytic unit advances the pipe including steam, all is equipped with steam inlet and steam outlet on every resin adsorption jar and every active carbon adsorption jar, and the steam inlet of every resin adsorption jar and the steam inlet of every active carbon adsorption jar all advance the pipe intercommunication with steam.
Further, the cooling unit includes cooling blower, cooling blower connects the cooling air pipeline, and every resin adsorption jar and every active carbon adsorption jar all communicate with the cooling air pipeline.
Further, the spraying unit comprises two spraying towers connected in series, and a spraying device of each spraying tower is communicated with the low-temperature water system through a spraying pump and a pipeline.
Further, the air inlet and the air outlet of each resin adsorption tank are provided with a switch valve, the air inlet of each resin adsorption tank is connected to the first gas transmission pipeline, and the air outlet of each resin adsorption tank is connected to the second gas transmission pipeline.
Furthermore, the air inlet and the air outlet of each activated carbon adsorption tank are provided with switch valves; the air inlet of each activated carbon adsorption tank is connected to the second gas transmission pipeline, and the air outlet of each activated carbon adsorption tank is connected to the exhaust pipeline.
Further, the vapor outlet of each resin adsorption tank and the vapor outlet of each activated carbon adsorption tank are connected to the condenser assembly through pipes.
Further, the first surface cooler is arranged at one gas inlet end of the cryogenic equipment.
Further, the condenser assembly comprises two condensers connected in series; the liquid outlet end of the condenser assembly is connected with a waste liquid tank, and the waste liquid tank is further connected with a spraying device of a spraying tower.
Furthermore, a jacket is arranged on the tower body of the spray tower and is connected with a low-temperature water system.
The utility model adopts the above technical scheme after, compare with prior art, have following advantage:
the utility model can realize the regeneration and the utilization of the adsorbent, reduce the dosage of the adsorbent, improve the adsorption efficiency and treat the tail gas with high concentration; can reduce the energy consumption of tail gas treatment.
The present invention will be described in detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, the position of the first and second end faces,
1-a first surface cooler, 2-a buffer tank, 3-cryogenic equipment, 4-a tail gas inlet pipeline, 5-a spray tower, 6-a first gas transmission pipeline, 7-a second surface cooler, 8-a second gas transmission pipeline, 9-a third surface cooler, 10-a resin adsorption tank, 11-an activated carbon adsorption tank, 12-an exhaust pipeline, 13-an adsorption fan, 14-a chimney, 15-a steam inlet pipe, 16-a condenser, 17-a waste liquid tank, 18-a cooling fan and 19-a cooling air pipeline.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
Examples
As shown in fig. 1, the utility model provides a dichloromethane tail gas processing apparatus, including the preprocessing unit who connects gradually, spray unit and absorption unit, it still is connected with desorption analysis unit and cooling unit to adsorb the unit.
The pretreatment unit comprises a first surface cooler 1 and a cryogenic device 3, the first surface cooler 1 and the cryogenic device 3 are arranged on a tail gas inlet pipeline 4, and the first surface cooler 1 is arranged at one gas inlet end of the cryogenic device 3; be equipped with buffer tank 2 between first surface cooler 1 and the cryrogenic equipment 3, the inlet end and the 1 gas outlet of first surface cooler of buffer tank 2 are connected, and the end of giving vent to anger of buffer tank 2 is connected with the air inlet of cryrogenic equipment 3.
The spray unit includes two spray towers 5 that establish ties, the spray set of spray tower 5 passes through spray pump and pipeline intercommunication low temperature water system, set up on the tower body of spray tower 5 and press from both sides the cover, press from both sides the cover and connect low temperature water system, spray tower 5's main effect is through low temperature water spraying reduction in the tail gas dichloromethane concentration and dust removal effect to utilize low temperature water to lower the temperature to the spray tower, avoid low temperature water in spray tower 5 to rise at circulation in-process water temperature, the influence is to dichloromethane's spraying effect.
The spraying unit is connected with the adsorption unit through a first gas transmission pipeline 6, and a second surface cooler 7 is arranged on the first gas transmission pipeline 6; the second surface air cooler 7 can remove moisture and other impurities brought out from the spray tower 5 by the tail gas, and influence on adsorption of resin and activated carbon is avoided.
The adsorption unit comprises a resin adsorption device and an active carbon adsorption device which are connected in series, the resin adsorption device and the active carbon adsorption device are communicated through a second gas transmission pipeline 8, a third surface cooler 9 and an adsorption fan 13 are arranged on the second gas transmission pipeline 8, the third surface cooler 9 reduces the moisture brought out by the heat generated by the adsorption of the resin adsorption device and the tail gas after passing through the resin adsorption device, and the tail gas entering the active carbon adsorption device is kept dry at a low temperature.
The resin adsorption device comprises three resin adsorption tanks 10 which are arranged in parallel, a gas inlet and a gas outlet of each resin adsorption tank 10 are respectively provided with a switch valve, the gas inlet of each resin adsorption tank 10 is connected to the first gas transmission pipeline 6, and the gas outlet of each resin adsorption tank 10 is connected to the second gas transmission pipeline 8.
The activated carbon adsorption device comprises three activated carbon adsorption tanks 11 which are arranged in parallel, and an air inlet and an air outlet of each activated carbon adsorption tank 11 are provided with switch valves; the air inlet of each activated carbon adsorption tank 11 is connected to the second air transmission pipeline 8, and the air outlet of each activated carbon adsorption tank 11 is connected to the exhaust pipeline 12; the exhaust duct 12 is connected to a chimney 14.
Desorption analysis unit advances pipe 15 including steam, all is equipped with steam inlet and steam outlet on every resin adsorption jar 10 and every active carbon adsorption jar 11, and the steam inlet of every resin adsorption jar 10 and the steam inlet of every active carbon adsorption jar 11 all advance pipe 15 intercommunications with steam, and the steam outlet of every resin adsorption jar 10 and the steam outlet of every active carbon adsorption jar 11 all pass through pipe connection in condenser subassembly, the condenser subassembly includes two condensers 16 that establish ties mutually.
The play liquid end and the waste liquid jar 17 of condenser subassembly are connected, and in the dichloromethane waste liquid of analytic recovery got into waste liquid jar 17, waste liquid jar 17 still was connected with the spray set of spray column 5, avoided the waste liquid jar to give vent to anger to exceed standard and lead to VOCs to emit into in the atmosphere and cause environmental pollution.
The cooling unit includes cooling blower 18, cooling blower 18 connects cooling air pipeline 19, and every resin adsorption tank 10 and every active carbon adsorption tank 11 all communicate with cooling air pipeline 19, treat that desorption analysis unit desorption is analytic to be accomplished the back, and cooling blower 18 cools off in sending into resin adsorption tank 10 and active carbon adsorption tank 11 with cooling air through cooling air pipeline 19, carries out new round of tail gas adsorption after the cooling finishes.
The utility model discloses a theory of operation:
firstly, cooling dichloromethane through a first surface cooler, cooling and recovering the dichloromethane through the surface cooler, then feeding the dichloromethane into a buffer tank, reducing the flow rate of the buffer tank, dehumidifying and reducing the concentration of tail gas so as to ensure that the tail gas entering cryogenic equipment is dry, simultaneously prolonging the residence time of the tail gas in the cryogenic equipment, after the tail gas enters the cryogenic equipment, recycling dichloromethane in the tail gas at high purity through the cryogenic equipment, feeding the dichloromethane tail gas after passing the cryogenic equipment into a spray tower for spraying, arranging a second surface cooler at the outlet of the spray tower, removing water vapor brought out of the spray tower by the tail gas, and reducing the adsorption load of resin; and the tail gas enters a resin adsorption tank, is subjected to primary adsorption by resin, enters an activated carbon adsorption tank for secondary adsorption, and is discharged after reaching the standard. And a third surface air cooler is arranged between the resin adsorption tank and the activated carbon adsorption tank, so that the tail gas humidity and temperature are reduced. Carrying out steam desorption regeneration on the resin and the activated carbon after saturated adsorption, and recycling the desorbed solvent; after the analysis is completed, the cooling fan 18 sends cooling air into the resin adsorption tank 10 and the activated carbon adsorption tank 11 through the cooling air pipeline 19 for cooling, and a new round of tail gas adsorption treatment is performed after the cooling is completed.
The utility model discloses well first surface cooler's effect reduces the dichloromethane temperature, retrieves partial solvent, reduces cryogenic equipment energy consumption, and cryogenic equipment mainly reduces tail gas dichloromethane content value, with the dichloromethane high-purity recycle in the tail gas. A buffer tank is arranged behind the surface cooler, the buffer tank can reduce the flow velocity of the tail gas and has the function of reducing the concentration of the tail gas to a certain extent, and the effects of deep cooling, spraying and adsorption are enhanced;
the active carbon adsorption tank is used for adsorbing residual organic components in the tail gas after being adsorbed by resin through active carbon; the desorption and analysis unit mainly analyzes saturated resin and active carbon through steam, cooling air is introduced for cooling for standby after desorption is completed, and the analyzed water vapor is cooled through a condenser and introduced into a waste liquid tank.
The utility model discloses well buffer tank can reduce the velocity of flow to increase waste gas dwell time and reduce the energy consumption.
The foregoing is illustrative of the best mode of the invention, and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical teaching of the present invention is also within the protection scope of the present invention.
Claims (10)
1. The utility model provides a dichloromethane tail gas processing apparatus, includes the pretreatment unit who connects gradually, sprays unit and adsorption unit, its characterized in that: the adsorption unit is also connected with a desorption and analysis unit and a cooling unit; the pretreatment unit comprises a first surface cooler (1) and cryogenic equipment (3), wherein the first surface cooler (1) and the cryogenic equipment (3) are installed on a tail gas inlet pipeline (4), and a buffer tank (2) is arranged between the first surface cooler (1) and the cryogenic equipment (3); the spraying unit is connected with the adsorption unit through a first gas transmission pipeline (6), and a second surface cooler (7) is arranged on the first gas transmission pipeline (6);
the adsorption unit comprises a resin adsorption device and an active carbon adsorption device which are connected in series, the resin adsorption device and the active carbon adsorption device are communicated through a second gas transmission pipeline (8), and a third surface cooler (9) and an adsorption fan (13) are arranged on the second gas transmission pipeline (8).
2. The methylene dichloride tail gas treatment device according to claim 1, characterized in that: the resin adsorption device comprises three resin adsorption tanks (10) which are arranged in parallel; the activated carbon adsorption device comprises three activated carbon adsorption tanks (11) which are arranged in parallel; the desorption and analysis unit comprises a steam inlet pipe (15), each resin adsorption tank (10) and each activated carbon adsorption tank (11) are respectively provided with a steam inlet and a steam outlet, and the steam inlet of each resin adsorption tank (10) and the steam inlet of each activated carbon adsorption tank (11) are communicated with the steam inlet pipe (15).
3. The methylene dichloride tail gas treatment device according to claim 1, characterized in that: the cooling unit comprises a cooling fan (18), the cooling fan (18) is connected with a cooling air pipeline (19), and each resin adsorption tank (10) and each activated carbon adsorption tank (11) are communicated with the cooling air pipeline (19).
4. The methylene dichloride tail gas treatment device according to claim 1, wherein: the spraying unit comprises two spraying towers (5) connected in series, and a spraying device of each spraying tower (5) is communicated with the low-temperature water system through a spraying pump and a pipeline.
5. The methylene dichloride tail gas treatment device according to claim 2, characterized in that: the air inlet and the air outlet of each resin adsorption tank (10) are respectively provided with a switch valve, the air inlet of each resin adsorption tank (10) is connected to the first gas transmission pipeline (6), and the air outlet of each resin adsorption tank (10) is connected to the second gas transmission pipeline (8).
6. The methylene dichloride tail gas treatment device according to claim 2, wherein: the air inlet and the air outlet of each activated carbon adsorption tank (11) are provided with switch valves; the air inlet of each activated carbon adsorption tank (11) is connected to the second air transmission pipeline (8), and the air outlet of each activated carbon adsorption tank (11) is connected to the exhaust pipeline (12).
7. The methylene dichloride tail gas treatment device according to claim 2, characterized in that: the steam outlet of each resin adsorption tank (10) and the steam outlet of each activated carbon adsorption tank (11) are connected to the condenser assembly through pipelines.
8. The methylene dichloride tail gas treatment device according to claim 1, wherein: the first surface cooler (1) is arranged at one gas inlet end of the cryogenic equipment (3).
9. The methylene dichloride tail gas treatment device according to claim 7, wherein: the condenser assembly comprises two condensers (16) connected in series; the liquid outlet end of the condenser assembly is connected with a waste liquid tank (17), and the waste liquid tank (17) is also connected with a spraying device of the spraying tower (5).
10. The methylene dichloride tail gas treatment device according to claim 4, wherein: the tower body of the spray tower (5) is provided with a jacket, and the jacket is connected with a low-temperature water system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221539678.3U CN217829454U (en) | 2022-06-20 | 2022-06-20 | Dichloromethane tail gas treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221539678.3U CN217829454U (en) | 2022-06-20 | 2022-06-20 | Dichloromethane tail gas treatment device |
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| Publication Number | Publication Date |
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| CN217829454U true CN217829454U (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221539678.3U Active CN217829454U (en) | 2022-06-20 | 2022-06-20 | Dichloromethane tail gas treatment device |
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| CN (1) | CN217829454U (en) |
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2022
- 2022-06-20 CN CN202221539678.3U patent/CN217829454U/en active Active
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