CN216171355U - Exhaust gas scrubbing system - Google Patents
Exhaust gas scrubbing system Download PDFInfo
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- CN216171355U CN216171355U CN202122795453.6U CN202122795453U CN216171355U CN 216171355 U CN216171355 U CN 216171355U CN 202122795453 U CN202122795453 U CN 202122795453U CN 216171355 U CN216171355 U CN 216171355U
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Abstract
The utility model belongs to the technical field of waste gas treatment, and particularly relates to a waste gas washing system which comprises a primary spray washing tower, wherein an NMP aqueous solution is filled in a water tank of the primary spray washing tower, the top of the primary spray washing tower is connected with a cyclone separator, the cyclone separator is connected with a secondary spray washing tower, the secondary spray washing tower is connected with a tertiary spray washing tower, and hydrogen peroxide is filled in a water tank of the tertiary spray washing tower. The waste gas is treated by a first-stage spray washing tower with a washing liquid which is an NMP water solution to remove VOC, then enters a cyclone separator to remove liquid drops containing NMP, enters a second-stage spray washing tower, is sprayed by second-stage spray washing to absorb trace NMP, enters a third-stage spray washing tower, and is oxidized by hydrogen peroxide, so that the waste gas can reach the standard and be discharged. The NMP is used as the washing liquid, so that the cost can be saved, the efficiency can be improved, and meanwhile, the absorbed organic solvent can be recovered by the high-boiling-point solvent in the recovery process and can be recycled. And does not increase the burden of wastewater treatment.
Description
Technical Field
The utility model belongs to the technical field of waste gas treatment, and particularly relates to a waste gas washing system.
Background
The society pays more and more attention to the protection of the atmospheric environment, and GB 37822 and 2019 issued in 2019 have unorganized emission control standards of volatile organic compounds, which are formally implemented in 7 and 1 month in 2020. Volatile Organic Compounds (VOCs) have to be treated inorganically. The purification treatment of the VOC organic waste gas is generally carried out by a waste gas washing tower. The conventional waste gas washing tower is usually an acid washing tower, an alkali washing tower or a hydrogen peroxide solution washing tower, or is connected with an activated carbon adsorption device in series, because the acid washing tower and the alkali washing tower can have chemical reaction with VOC in waste gas, reagents are consumed, salt-containing waste water is generated, the disposal cost of the waste water is increased, and the absorption effect of hydrophobic organic matters by a water washing method is not good, so that the washing efficiency is low.
SUMMERY OF THE UTILITY MODEL
In view of the defects of the prior art, the utility model provides an exhaust gas washing system, and aims to solve the technical problems that in the existing VOC exhaust gas washing, an acid washing tower and an alkali washing tower can perform chemical reaction with VOC in exhaust gas, reagent is consumed, salt-containing wastewater is generated, the disposal cost of the wastewater is increased, and the absorption effect of hydrophobic organic matters by a water washing method is not good, so that the washing efficiency is low.
The utility model provides a waste gas washing system, which has the following specific technical scheme:
waste gas washing system, including the one-level washing tower that sprays, the NMP aqueous solution is equipped with in the water tank of one-level washing tower that sprays, the top of one-level washing tower that sprays is connected with cyclone, cyclone is connected with the second grade washing tower that sprays, the second grade washing tower that sprays is connected with tertiary washing tower that sprays, the water tank of tertiary washing tower that sprays is equipped with hydrogen peroxide solution in.
In certain embodiments, the bottom of the cyclone is in communication with the water tank of the primary spray scrubber.
In certain embodiments, the first-stage spray washing tower, the second-stage spray washing tower and the third-stage spray washing tower are respectively provided with a first sprayer and a second sprayer, and each first sprayer and each second sprayer are communicated with the water tank of the corresponding spray washing tower through a circulating pump.
Furthermore, demisters are arranged on the top of the first-stage spraying washing tower, the top of the second-stage spraying washing tower and the top of the third-stage spraying washing tower, and each demister is positioned above each second sprayer.
In certain embodiments, the water tank of the primary spray scrubber, the water tank of the secondary spray scrubber and the water tank of the tertiary spray scrubber are all in communication with a tap water line.
In some embodiments, the tower body of the first stage spray washing tower is communicated with a solvent recovery processing pipeline, and the water tank of the first stage spray washing tower is also communicated with the solvent recovery processing pipeline.
In some embodiments, the tower body of the secondary spray washing tower is communicated with a sewage treatment pipeline, and the water tank of the secondary spray washing tower, the tower body of the tertiary spray washing tower and the water tank of the tertiary spray washing tower are communicated with the sewage treatment pipeline.
In certain embodiments, a first fan is disposed between the cyclone and the secondary spray scrubber.
In certain embodiments, the tertiary spray scrubber communicates with the discharge stack through a second fan.
The utility model has the following beneficial effects: according to the waste gas washing system provided by the utility model, the waste gas passes through the primary spray washing tower with the washing liquid being the NMP water solution to remove VOC in the waste gas, then enters the cyclone separator to remove liquid drops containing NMP, enters the secondary spray washing tower, absorbs trace NMP through secondary spray washing, enters the tertiary spray washing tower, and is oxidized by hydrogen peroxide, so that the waste gas can reach the standard and be discharged. The NMP is used as the washing liquid, so that the cost can be saved, the efficiency can be improved, and meanwhile, the absorbed organic solvent can be recovered by the high-boiling-point solvent in the recovery process and can be recycled. And does not increase the burden of wastewater treatment.
Drawings
Fig. 1 is a schematic structural view of an exhaust gas scrubbing system according to embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings 1 in conjunction with specific embodiments.
Example 1
The utility model provides a waste gas washing system, which has the following specific technical scheme:
the waste gas washing system comprises a primary spray washing tower 1, an NMP water solution is filled in a water tank 1-1 of the primary spray washing tower 1, the top of the primary spray washing tower 1 is connected with a cyclone separator 2, the cyclone separator 2 is connected with a secondary spray washing tower 3, the secondary spray washing tower 3 is connected with a tertiary spray washing tower 4, and hydrogen peroxide is filled in a water tank 4-1 of the tertiary spray washing tower 4. Waste gas enters a first-stage spraying washing tower 1, the VOC in the waste gas is removed by cleaning of an NMP aqueous solution, the gas is input into a cyclone separator 2, liquid drops containing the NMP are separated and removed through the cyclone separator 2, the waste gas enters a second-stage spraying washing tower 3, the NMP with trace amount is absorbed by second-stage spraying water washing, the waste gas enters a third-stage spraying washing tower 4 and is oxidized by hydrogen peroxide, and the waste gas can be discharged up to the standard.
Specifically, the bottom of the cyclone separator 2 is communicated with a water tank 1-1 of a first-stage spray washing tower 1. Thus, the separated NMP is returned to the water tank 1-1 of the first-stage spray washing tower 1 and can be recycled.
Specifically, the first-stage spray washing tower 1, the second-stage spray washing tower 3 and the third-stage spray washing tower 4 are respectively provided with a first sprayer 5 and a second sprayer 6, and each first sprayer 5 and each second sprayer 6 are respectively communicated with a water tank of the corresponding spray washing tower through a circulating pump 9. Because the first-stage spraying washing tower 1, the second-stage spraying washing tower 3 and the third-stage spraying washing tower 4 are higher, the two layers of sprayers are arranged, so that sprayed liquid mist can be uniformly distributed in the whole tower, and the washing effect is better. In addition, in order to adapt to different application scenes, the sprayers in each spray washing tower are not limited to be only provided with two layers, and the higher the tower body is, the more layers of the sprayers are correspondingly arranged. And fillers are arranged below the first sprayer 5 and the second sprayer 6.
Specifically, demisters 7 are arranged on the top of the first-stage spray washing tower 1, the top of the second-stage spray washing tower 3 and the top of the third-stage spray washing tower 4, and each demister 7 is located above each second sprayer 6. The demister 7 is arranged for removing mist at the top of the first-stage spray washing tower 1, the top of the second-stage spray washing tower 3 and the top outlet of the third-stage spray washing tower 4 and preventing the mist from being brought into the next treatment system.
Specifically, a water tank 1-1 of the first-stage spray washing tower 1, a water tank 3-1 of the second-stage spray washing tower 3 and a water tank 4-1 of the third-stage spray washing tower 4 are all communicated with a tap water pipeline 8. The water solvent can be supplemented to or replaced in the water tank 1-1 of the first-stage spray washing tower 1, the water tank 3-1 of the second-stage spray washing tower 3 and the water tank 4-1 of the third-stage spray washing tower 4 in real time.
Specifically, the tower body of the first stage spray washing tower 1 is communicated with a solvent recovery processing pipeline 10, and the water tank 1-1 of the first stage spray washing tower 1 is also communicated with the solvent recovery processing pipeline 10. The NMP solvent in the tower body of the first-stage spray washing tower 1 and the water tank can be recovered by a solvent recovery processing pipeline 10.
Specifically, the tower body of the second-stage spray washing tower 3 is communicated with a sewage treatment pipeline 11, and the water tank 3-1 of the second-stage spray washing tower 3, the tower body of the third-stage spray washing tower 4 and the water tank 4-1 of the third-stage spray washing tower 4 are all communicated with the sewage treatment pipeline 11. The waste liquid in the tower body of the second-stage spraying washing tower 3, the water tank 3-1 of the second-stage spraying washing tower 3, the tower body of the third-stage spraying washing tower 4 and the water tank 4-1 of the third-stage spraying washing tower 4 can be recycled and discharged through a sewage treatment pipeline 11.
Specifically, a first fan 12 is arranged between the cyclone separator 2 and the secondary spray washing tower 3. The resistance between the cyclone 2 and the secondary spray scrubber 3 is large and requires the first fan 12 to provide power.
Specifically, the tertiary spray scrubber 4 communicates with a discharge stack 14 through a second fan 13. The second fan 13 pumps the gas in the three-stage spray washing tower 4 into the exhaust stack 14 for exhaust.
In summary, in the waste gas washing system provided by the utility model, the waste gas passes through the primary spray washing tower 1 with the washing liquid being the NMP water solution to remove the VOC therein, then enters the cyclone separator 2 between the demister 7 of the primary spray washing tower 1 and the pipeline to remove the liquid drops containing the NMP, enters the secondary spray washing tower 3, the secondary spray washing absorbs the trace NMP, enters the tertiary spray washing tower 4 and is oxidized by hydrogen peroxide, and the waste gas can reach the standard and be discharged. The NMP is used as the washing liquid, so that the cost can be saved, the efficiency can be improved, and meanwhile, the absorbed organic solvent can be recovered by the high-boiling-point solvent in the recovery process and can be recycled. And does not increase the burden of wastewater treatment.
The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not to be construed as limiting the utility model, and the present invention is not limited to the above examples, and those skilled in the art should also be able to make various changes, modifications, additions or substitutions within the spirit and scope of the present invention.
Claims (9)
1. Waste gas washing system, its characterized in that, including one-level spray scrubber, the NMP aqueous solution is equipped with in the water tank of one-level spray scrubber, the top of one-level spray scrubber is connected with cyclone, cyclone is connected with the second grade spray scrubber, the second grade spray scrubber is connected with tertiary spray scrubber, the water tank of tertiary spray scrubber is equipped with hydrogen peroxide solution in.
2. The exhaust gas scrubbing system of claim 1, wherein the bottom of said cyclone is in communication with the water tank of said primary spray scrubber.
3. The exhaust gas scrubbing system according to claim 1, wherein each of said primary spray scrubber tower, said secondary spray scrubber tower and said tertiary spray scrubber tower is provided with a first sprayer and a second sprayer, each of said first sprayer and said second sprayer being in communication with a water tank of a corresponding spray scrubber tower through a circulation pump.
4. The exhaust gas scrubbing system of claim 3, wherein a top of said primary spray scrubber, a top of said secondary spray scrubber and a top of said tertiary spray scrubber are each provided with a mist eliminator, each of said mist eliminators being located above each of said secondary sprayers.
5. The exhaust gas scrubbing system of claim 1, wherein the water tank of said primary spray scrubber tower, the water tank of said secondary spray scrubber tower, and said tertiary spray scrubber tower water tank are all in communication with a tap water line.
6. The exhaust gas washing system of claim 1, wherein the tower body of the primary spray scrubber is communicated with a solvent recovery processing pipeline, and the water tank of the primary spray scrubber is also communicated with the solvent recovery processing pipeline.
7. The exhaust gas washing system of claim 1, wherein the tower body of the secondary spray washing tower is communicated with a sewage treatment pipeline, and the water tank of the secondary spray washing tower, the tower body of the tertiary spray washing tower and the water tank of the tertiary spray washing tower are communicated with the sewage treatment pipeline.
8. The exhaust gas scrubbing system of claim 1, wherein a first fan is disposed between said cyclone separator and said secondary spray scrubber.
9. The exhaust gas scrubbing system of claim 1, wherein said tertiary spray scrubber tower is in communication with a discharge stack via a second fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122795453.6U CN216171355U (en) | 2021-11-15 | 2021-11-15 | Exhaust gas scrubbing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122795453.6U CN216171355U (en) | 2021-11-15 | 2021-11-15 | Exhaust gas scrubbing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216171355U true CN216171355U (en) | 2022-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122795453.6U Active CN216171355U (en) | 2021-11-15 | 2021-11-15 | Exhaust gas scrubbing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216171355U (en) |
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2021
- 2021-11-15 CN CN202122795453.6U patent/CN216171355U/en active Active
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