CN113877367A - Exhaust gas scrubbing method - Google Patents
Exhaust gas scrubbing method Download PDFInfo
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- CN113877367A CN113877367A CN202111346380.0A CN202111346380A CN113877367A CN 113877367 A CN113877367 A CN 113877367A CN 202111346380 A CN202111346380 A CN 202111346380A CN 113877367 A CN113877367 A CN 113877367A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/20—Organic absorbents
- B01D2252/205—Other organic compounds not covered by B01D2252/00 - B01D2252/20494
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/704—Solvents not covered by groups B01D2257/702 - B01D2257/7027
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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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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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the technical field of waste gas treatment, and particularly relates to a waste gas washing method which comprises a high-boiling-point solvent leaching step, a high-boiling-point solvent separating step and a hydrogen peroxide leaching step; the high-boiling-point solvent leaching step is used for absorbing VOC in the waste gas; the step of separating the high-boiling point solvent is used for separating and recovering the high-boiling point solvent from the gas delivered by the step of leaching the high-boiling point solvent; the hydrogen peroxide leaching step is used for carrying out oxidation treatment on the gas conveyed in the high-boiling-point solvent separation step, and the gas reaches the discharge standard. According to the waste gas washing method provided by the invention, both hydrophobic and hydrophilic gases in the waste gas can be absorbed by the high-boiling-point solvent, so that the washing efficiency of the aqueous solution as a washing agent is prevented from being lowered. The high boiling point solvent can save cost and improve efficiency as the washing liquid, and the high boiling point solvent can also recover the absorbed organic solvent in the recovery process and can be repeatedly used, thereby not increasing the burden of wastewater treatment.
Description
Technical Field
The invention belongs to the technical field of waste gas treatment, and particularly relates to a waste gas washing method.
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.
Disclosure of Invention
In view of the defects of the prior art, the invention provides an exhaust gas washing method, 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 invention provides a waste gas washing method, which comprises the following specific technical scheme:
the waste gas washing method comprises a high boiling point solvent leaching step, a high boiling point solvent separation step and a hydrogen peroxide leaching step;
the high boiling point solvent leaching step is used for absorbing VOC in the waste gas;
the step of separating the high-boiling-point solvent is used for separating and recovering the high-boiling-point solvent from the gas delivered by the step of leaching the high-boiling-point solvent;
and the hydrogen peroxide leaching step is used for carrying out oxidation treatment on the gas conveyed in the high-boiling-point solvent separation step to reach the discharge standard.
In certain embodiments, the high boiling point solvent is N-methylpyrrolidone (NMP).
In some embodiments, in the high boiling point solvent rinsing step, the VOC in the exhaust gas is absorbed by using a primary spray scrubber, the high boiling point solvent is mixed with water to prepare a high boiling point solvent aqueous solution, the high boiling point solvent aqueous solution is placed in a water tank of the primary spray scrubber, and the high boiling point solvent aqueous solution is spray atomized in the primary spray scrubber through a spray thrower of the primary spray scrubber.
Further, the mass percentage of the high-boiling point solvent in the high-boiling point solvent aqueous solution is 50-70%.
Further, in the step of separating the high boiling point solvent, a cyclone separator is used for removing liquid drops containing the high boiling point solvent so as to realize separation and recovery of the high boiling point solvent.
Further, in the step of separating the high boiling point solvent, a secondary spray washing tower is also used for absorbing the trace amount of the high boiling point solvent in the gas output from the cyclone separator.
Further, in the step of separating the high boiling point solvent, the gas from the double output of the cyclone separator is input into the secondary spray washing tower through a fan.
In some embodiments, in the hydrogen peroxide leaching step, a three-stage spray washing tower is used for carrying out oxidation treatment on gas, hydrogen peroxide is filled in a water tank of the three-stage spray washing tower, and the hydrogen peroxide is sprayed and atomized in the three-stage spray washing tower through a sprayer of the three-stage spray washing tower.
The invention has the following beneficial effects: according to the waste gas washing method provided by the invention, both hydrophobic and hydrophilic gases in the waste gas can be absorbed by the high-boiling-point solvent, so that the washing efficiency of the aqueous solution as a washing agent is prevented from being lowered. The high boiling point solvent can save cost and improve efficiency as the washing liquid, and the high boiling point solvent can also recover the absorbed organic solvent in the recovery process and can be repeatedly used, thereby not increasing the burden of wastewater treatment.
Drawings
FIG. 1 is a flow diagram of an exhaust scrubbing process of the present invention;
fig. 2 is a schematic view of a system configuration adapted to the exhaust gas scrubbing method of 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 1-2 in conjunction with specific embodiments.
Example 1
The specific technical scheme of the waste gas washing method provided by the embodiment is as follows:
the waste gas washing method comprises a high boiling point solvent leaching step, a high boiling point solvent separation step and a hydrogen peroxide leaching step;
the high-boiling-point solvent leaching step is used for absorbing VOC in the waste gas;
the step of separating the high-boiling point solvent is used for separating and recovering the high-boiling point solvent from the gas delivered by the step of leaching the high-boiling point solvent;
the hydrogen peroxide leaching step is used for carrying out oxidation treatment on the gas conveyed in the high-boiling-point solvent separation step, and the gas reaches the discharge standard.
In this example, the high boiling point solvent is NMP.
In this embodiment, in the high boiling point solvent leaching step, the VOC in the exhaust gas is absorbed by the first-stage spray scrubber, the high boiling point solvent is mixed with water to prepare a high boiling point solvent aqueous solution, the high boiling point solvent aqueous solution is placed in the water tank of the first-stage spray scrubber, and the high boiling point solvent aqueous solution is sprayed and atomized in the first-stage spray scrubber through the sprayer of the first-stage spray scrubber.
In this example, the volume percentage of the high boiling point solvent in the high boiling point solvent aqueous solution is 50 to 70%.
In this embodiment, in the step of separating the high boiling point solvent, the cyclone is used to remove the liquid droplets containing the high boiling point solvent, so as to separate and recover the high boiling point solvent.
In this embodiment, in the step of separating the high boiling point solvent, the two-stage spray scrubber is also used to absorb the trace amount of the high boiling point solvent in the gas output from the cyclone.
In this embodiment, in the step of separating the high boiling point solvent, the gas from the cyclone separator with double output is input into the second-stage spray scrubber via the fan.
In this embodiment, in the hydrogen peroxide leaching step, a third-stage spray washing tower is used to oxidize the gas, hydrogen peroxide is contained in a water tank of the third-stage spray washing tower, and the hydrogen peroxide is sprayed and atomized in the third-stage spray washing tower through a sprayer of the third-stage spray washing tower.
In order to adapt to the above-mentioned exhaust gas scrubbing method, the present embodiment provides a system as shown in fig. 2, and the detailed structure is as follows:
the NMP spraying washing tower comprises a first-stage spraying washing tower 1, wherein an NMP water solution is filled in a water tank 1-1 of the first-stage spraying washing tower 1, the top of the first-stage spraying washing tower 1 is connected with a cyclone separator 2, the cyclone separator 2 is connected with a second-stage spraying washing tower 3, the second-stage spraying washing tower 3 is connected with a third-stage spraying washing tower 4, and hydrogen peroxide is filled in a water tank 4-1 of the third-stage spraying 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 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 a fan 12 to provide power.
In summary, in the exhaust gas scrubbing method provided by the present invention, both hydrophobic and hydrophilic gases in the exhaust gas can be absorbed by the high boiling point solvent, so that the scrubbing efficiency of the aqueous solution as the scrubbing agent is prevented from being lowered. The high boiling point solvent can save cost and improve efficiency as the washing liquid, and the high boiling point solvent can also recover the absorbed organic solvent in the recovery process and can be repeatedly used, thereby not increasing 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 invention, 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 (8)
1. The waste gas washing method is characterized by comprising a high boiling point solvent leaching step, a high boiling point solvent separation step and a hydrogen peroxide leaching step;
the high boiling point solvent leaching step is used for absorbing VOC in the waste gas;
the step of separating the high-boiling-point solvent is used for separating and recovering the high-boiling-point solvent from the gas delivered by the step of leaching the high-boiling-point solvent;
and the hydrogen peroxide leaching step is used for carrying out oxidation treatment on the gas conveyed in the high-boiling-point solvent separation step to reach the discharge standard.
2. The exhaust gas scrubbing method according to claim 1, wherein said high boiling point solvent is N-methylpyrrolidone.
3. The exhaust gas scrubbing method according to claim 1, wherein in the high boiling point solvent rinsing step, VOC in the exhaust gas is absorbed by a primary spray scrubber, the high boiling point solvent is mixed with water to prepare a high boiling point solvent aqueous solution, the high boiling point solvent aqueous solution is placed in a water tank of the primary spray scrubber, and the high boiling point solvent aqueous solution is spray-atomized in the primary spray scrubber by a spray thrower of the primary spray scrubber.
4. The exhaust gas scrubbing method according to claim 3, wherein the percentage by volume of the high-boiling solvent in said aqueous solution of the high-boiling solvent is 50 to 70%.
5. The exhaust gas washing method according to claim 1, wherein in the step of separating the high boiling point solvent, the separation and recovery of the high boiling point solvent is carried out by removing liquid droplets containing the high boiling point solvent using a cyclone.
6. The exhaust gas washing method according to claim 5, wherein in the step of separating the high boiling point solvent, a trace amount of the high boiling point solvent in the gas outputted from the cyclone is also absorbed by a secondary spray washing tower.
7. The exhaust gas washing method according to claim 6, wherein in the step of separating the high boiling point solvent, the gas from the cyclone to the dual output is input to the secondary spray scrubber via a fan.
8. The exhaust gas washing method according to claim 1, wherein in the hydrogen peroxide leaching step, gas is oxidized by using a three-stage spray scrubber, hydrogen peroxide is contained in a water tank of the three-stage spray scrubber, and the hydrogen peroxide is sprayed and atomized in the three-stage spray scrubber through a sprayer of the three-stage spray scrubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111346380.0A CN113877367A (en) | 2021-11-15 | 2021-11-15 | Exhaust gas scrubbing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111346380.0A CN113877367A (en) | 2021-11-15 | 2021-11-15 | Exhaust gas scrubbing method |
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| CN113877367A true CN113877367A (en) | 2022-01-04 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005052685A (en) * | 2003-06-16 | 2005-03-03 | 英正 ▲鶴▼田 | Method for recovering water-soluble voc and halogenated voc coexisting in gas |
| CN101099913A (en) * | 2007-07-23 | 2008-01-09 | 马军 | Method for treating waste gas containing low boiling point water-insoluble organic solvent |
| CN104548875A (en) * | 2014-11-04 | 2015-04-29 | 华文蔚 | Method for purifying volatile organic poison gas |
| US20180318756A1 (en) * | 2015-11-09 | 2018-11-08 | Shell Oil Company | Process for removing mercaptans from a gas stream |
| CN208097776U (en) * | 2018-02-28 | 2018-11-16 | 西安优瑞卡环保科技有限公司 | A kind of device that VOCs exhaust gas is handled using ozone and solvent |
| CN109806752A (en) * | 2019-03-28 | 2019-05-28 | 苏州三拓环保科技有限公司 | A kind of exhaust treatment system |
| CN208990499U (en) * | 2018-06-22 | 2019-06-18 | 江苏昌吉利新能源科技有限公司 | A kind of tower high boiling solvent absorption VOC and recycle device |
-
2021
- 2021-11-15 CN CN202111346380.0A patent/CN113877367A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005052685A (en) * | 2003-06-16 | 2005-03-03 | 英正 ▲鶴▼田 | Method for recovering water-soluble voc and halogenated voc coexisting in gas |
| CN101099913A (en) * | 2007-07-23 | 2008-01-09 | 马军 | Method for treating waste gas containing low boiling point water-insoluble organic solvent |
| CN104548875A (en) * | 2014-11-04 | 2015-04-29 | 华文蔚 | Method for purifying volatile organic poison gas |
| US20180318756A1 (en) * | 2015-11-09 | 2018-11-08 | Shell Oil Company | Process for removing mercaptans from a gas stream |
| CN208097776U (en) * | 2018-02-28 | 2018-11-16 | 西安优瑞卡环保科技有限公司 | A kind of device that VOCs exhaust gas is handled using ozone and solvent |
| CN208990499U (en) * | 2018-06-22 | 2019-06-18 | 江苏昌吉利新能源科技有限公司 | A kind of tower high boiling solvent absorption VOC and recycle device |
| CN109806752A (en) * | 2019-03-28 | 2019-05-28 | 苏州三拓环保科技有限公司 | A kind of exhaust treatment system |
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