CN113413726A - Organic waste gas adsorption recovery purification process - Google Patents
Organic waste gas adsorption recovery purification process Download PDFInfo
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- CN113413726A CN113413726A CN202110661562.0A CN202110661562A CN113413726A CN 113413726 A CN113413726 A CN 113413726A CN 202110661562 A CN202110661562 A CN 202110661562A CN 113413726 A CN113413726 A CN 113413726A
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- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
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- B01D53/002—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 condensation
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- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
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- 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
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
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- 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
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
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- 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
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
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- B01D2257/20—Halogens or halogen compounds
- B01D2257/206—Organic halogen compounds
- B01D2257/2064—Chlorine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
Abstract
The invention provides an organic waste gas adsorption, recovery and purification process, which comprises the following steps: organic waste gas enters an adsorption tank through a spray tower and a surface cooler, enters from the bottom of an adsorber and is adsorbed by an activated carbon bed layer from bottom to top; the adsorption saturation of the absorber is changed into a desorption state, steam is used for heating desorption, the steam is desorbed from top to bottom through the activated carbon bed layer, and organic matters adsorbed in the activated carbon bed layer and the steam enter the condenser together for condensation; a small amount of non-condensable gas condensed by the condenser returns to the front of the fan for re-adsorption, condensed condensate enters a layering tank for gravity layering, upper-layer organic matter enters an intermediate storage tank, and lower-layer wastewater is discharged to a designated position; after the desorption of the adsorber is finished, introducing fresh air to cool and dehumidify the activated carbon bed layer in an internal circulation mode. By adopting the technical scheme of the invention, the average adsorption rate is not lower than 90% in one year, the adsorption and desorption processes are short, the speed is high, and the energy consumption for desorption and regeneration is low.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to an organic waste gas adsorption, recovery and purification process.
Background
Organic waste gas is generated in the production and manufacturing processes of various industries, and most enterprises in the prior art adopt a direct discharge mode or a direct discharge mode after simple treatment, which has great harm to the environment.
In the related art, the organic waste gas is generally treated by adopting a spray tower, UV photolysis, plasma treatment and other modes, the organic waste gas is not easy to recycle and treat, the purification rate is low, and the treatment cost of the organic waste gas is high.
Therefore, how to reduce the organic waste gas treatment cost and better improve the recovery rate and purification rate of the organic waste gas becomes a technical problem to be solved urgently.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
Therefore, the invention aims to provide an organic waste gas adsorption recovery purification process, which is used for adsorbing, recovering and purifying organic waste gas containing DMF, chloropropene, triethylamine, TAIC and hydrochloric acid mist, wherein the average adsorption rate in one year is not lower than 90%, the adsorption and desorption processes are short, the speed is high, the desorption and regeneration energy consumption is low, and after the desorption of an adsorber is finished, fresh air is introduced to cool and dehumidify an active carbon bed layer in an internal circulation mode, so that the equilibrium saturated adsorption quantity is effectively improved, and the purification rate and the recovery rate are improved. Organic matters adsorbed in the activated carbon bed layer and water vapor enter the condenser together for condensation, the organic matters on the upper layer enter the middle storage tank, the waste water on the lower layer is discharged in a centralized manner, the recovery treatment is easy, a small amount of non-condensable gas condensed by the condenser is adsorbed before returning to the fan, and the adsorption rate and the purification rate are guaranteed.
In order to achieve the above object, the technical scheme of the present invention provides an adsorption, recovery and purification process for organic waste gas, wherein the organic waste gas comprises DMF, chloropropene, triethylamine, TAIC, and hydrochloric acid mist, and the process comprises the following steps: organic waste gas enters an adsorption tank through a spray tower and a surface cooler, the adsorption tank consists of three adsorbers, and the organic waste gas enters from the bottom of the adsorbers and is adsorbed by an activated carbon bed layer from bottom to top; the adsorption saturation of the absorber is changed into a desorption state, steam is used for heating desorption, the steam is desorbed from top to bottom through the activated carbon bed layer, and organic matters adsorbed in the activated carbon bed layer and the steam enter the condenser together for condensation; a small amount of non-condensable gas condensed by the condenser returns to the front of the fan for re-adsorption, condensed condensate enters a layering tank for gravity layering, upper-layer organic matter enters an intermediate storage tank, and lower-layer wastewater is discharged to a designated position; after the desorption of the adsorber is finished, introducing fresh air to cool and dehumidify the activated carbon bed layer in an internal circulation mode.
The flow rate of the organic waste gas is 8000m3The entry amount of DMF is 32.91t/a, the entry rate is 4.15kg/h, and the entry concentration is 518.75mg/m3After the organic waste gas is treated by the adsorption, recovery and purification process, the removal rate can reach 96 percent, the discharge amount is 1.32t/a, the discharge rate is 0.166kg/h, and the discharge concentration is 20.75mg/m3(ii) a The chloropropene entering amount is 0.79t/a, the entering speed is 0.1kg/h, and the entering concentration is 12.5mg/m3The removal rate can reach 94 percent, and the discharge amount is0.047t/a, the discharge rate is 0.006kg/h, and the discharge concentration is 0.75mg/m3(ii) a The input amount of triethylamine is 0.28t/a, the input speed is 0.035kg/h, and the input concentration is 4.38mg/m3The removal rate can reach 94 percent, the discharge amount is 0.017t/a, the discharge rate is 0.0021kg/h, and the discharge concentration is 0.26mg/m3(ii) a The entry amount of TAIC is 2.22t/a, the entry rate is 0.28kg/h, and the entry concentration is 35mg/m3The removal rate can reach 90 percent, the discharge amount is 0.22t/a, the discharge rate is 0.028kg/h, and the discharge concentration is 3.5mg/m3(ii) a The entering amount of the hydrochloric acid mist is 2.68t/a, the entering speed is 0.58kg/h, and the entering concentration is 72.5mg/m3The removal rate can reach 95 percent, the discharge amount is 0.13t/a, the discharge rate is 0.029kg/h, and the discharge concentration is 3.63mg/m3。
DMF i.e. N, N-dimethylformamide and TAIC i.e. triallyl isocyanurate.
Preferably, the temperature of the steam used for heating desorption of the adsorber is 140-142 ℃, and the flow rate is 1.1 ton/hour.
With this design, utilize steam heating desorption, the desorption process is short, and is fast, and desorption, regeneration energy consumption are low, are convenient for organic waste gas's recovery and purification.
Preferably, in the cooling and dehumidifying stage, the temperature of the introduced fresh air is 20 ℃, and the flow rate is 2m3Per hour, cycle time was 8 hours.
With the design, the cooling and dehumidifying configuration is reasonable, the equilibrium saturation adsorption capacity is improved, and the equilibrium saturation adsorption capacity is improved by 20 percent, thereby being beneficial to improving the purification rate and the recovery rate
Preferably, the organic waste gas is dry filtered through a dry filter before being introduced into the adsorption tank.
Preferably, the dry filter comprises primary filter cotton and secondary cloth bag filtration.
Dust and water mist in the organic waste gas can be effectively removed through the dry filter, and particulate matters and the water mist can be effectively intercepted by the filter material so as to ensure the cleanness of the air quantity. Water is not needed in the filtering process of the dry filter, so that secondary pollution is avoided, the environment is protected, the energy is saved, and the cost is not high.
Preferably, the activated carbon bed layer adopts a granular activated carbon adsorption material GAC, the organic waste gas is powered by a fan, and enters the activated carbon bed layer after entering the adsorption tank under negative pressure.
The organic waste gas is powered by a fan, is sucked into the adsorption tank under negative pressure and then enters the activated carbon adsorption layer, and unbalanced and unsaturated molecular attraction or chemical bond force exists on the surface of the activated carbon adsorption layer, so that when the surface of the activated carbon adsorbent is contacted with gas, gas molecules can be attracted, concentrated and kept on the surface of the activated carbon, namely, adsorption is carried out. The organic waste gas is contacted with the porous active carbon adsorbent with a large surface by utilizing the surface adsorption capacity of the active carbon adsorption layer, pollutants in the organic waste gas are adsorbed on the surface of the active carbon, so that the pollutants are separated from the gas mixture, and the purified gas is discharged at high altitude.
And the desorption operation is carried out on the adsorber after the adsorption saturation, and after the desorption is finished, the temperature reduction and dehumidification are carried out on the activated carbon bed layer, so that the activated carbon bed layer is repeatedly utilized.
Preferably, the model of the activated carbon bed layer is 2000mm 1100mm 1300mm, and the organic waste gas is introduced with the flow rate of 8000m3/h。
Preferably, the refrigerating capacity of the surface cooler is 120kw, and the heat exchange area is 3m3。
Preferably, the spray tower comprises two alkali spray layers, a water spray layer and a demisting layer, wherein the spray layers adopt ceramic structured packing, have the thickness of 300mm and adopt silicon carbide nozzles; the defogging layer adopts ceramic structured packing and has the thickness of 500 mm.
The two alkali spraying layers can remove acid gas carried in organic waste gas, the water spraying layer can remove salt generated after alkali spraying, and the demisting layer can be dewatered and demisted.
The organic waste gas adsorption, recovery and purification process provided by the invention has the following beneficial technical effects:
(1) the organic waste gas adsorption recovery purification process provided by the invention is used for adsorbing, recovering and purifying organic waste gas containing DMF, chloropropene, triethylamine, TAIC and hydrochloric acid mist, the average adsorption rate in one year is not lower than 90%, and the adsorption and desorption processes are short, high in speed and low in desorption and regeneration energy consumption.
(2) According to the organic waste gas adsorption, recovery and purification process provided by the invention, after the desorption of the adsorber is finished, fresh air is introduced to carry out cooling and dehumidification on the activated carbon bed layer in an internal circulation mode, so that the equilibrium saturated adsorption capacity is effectively improved, and the purification rate and the recovery rate are improved.
(3) Organic matters adsorbed in the activated carbon bed layer and water vapor enter the condenser together for condensation, the organic matters on the upper layer enter the middle storage tank, the waste water on the lower layer is discharged in a centralized manner, the recovery treatment is easy, a small amount of non-condensable gas condensed by the condenser is adsorbed before returning to the fan, and the adsorption rate and the purification rate are guaranteed.
(4) In the organic waste gas adsorption recovery purification process provided by the invention, the removal rate of DMF can reach 96%, the removal rate of chloropropene can reach 94%, the removal rate of triethylamine can reach 94%, the removal rate of TAIC can reach 90%, and the removal rate of hydrochloric acid mist can reach 95%.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic flow diagram of an organic waste gas adsorption recovery purification process according to one embodiment of the present invention;
wherein, the corresponding relation between the reference numbers and the components in fig. 1 is:
102 spray tower, 1022 alkali spray layer, 1024 water spray layer, 1026 demisting layer, 104 surface cooler, 106 dry filter, 108 adsorption tank, 1082 adsorber, 110 fan, 112 condenser and 114 intermediate storage tank.
Detailed Description
The invention discloses an organic waste gas adsorption recovery purification process, which can be realized by appropriately improving process parameters by referring to the contents in the text by the technical personnel in the field. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The invention is further illustrated by the following examples:
examples
The organic waste gas was introduced as shown in table 1 below,
TABLE 1
As shown in FIG. 1, the organic waste gas enters from the bottom of the spray tower 102 and passes through an alkali spray layer 1022, a water spray layer 1024 and a demisting layer 1026, the alkali spray concentration is 10%, and the flow rate is 2m3Per hour, water spray flow rate of 3m3The organic waste gas after being sprayed and demisted flows out of the top of the spray tower 102 and enters the surface cooler 104, the temperature of the organic waste gas is controlled to be 28 ℃ by the surface cooler 104, the organic waste gas treated by the surface cooler 104 is introduced into the dry filter 106, dust and water mist in the organic waste gas are removed through the primary filter cotton and the secondary cloth bag filtration to ensure the cleanness of the air feeding amount, the organic waste gas is powered by the fan 110, the organic waste gas enters the adsorption tank 108 under the negative pressure, enters the adsorber 1082 from the bottom and passes through the activated carbon bed layer from bottom to top for adsorption, and then is discharged by a 15m high-exhaust funnel, and the average adsorption rate in one year is not lower than 90%.
The model of the activated carbon bed layer is 2000mm 1100mm 1300mm, the refrigerating capacity of the surface cooler 104 is 120kw, and the heat exchange area is 3m3The spraying layer adopts ceramic structured packing with the thickness of 300mm and adopts a silicon carbide nozzle; demisting layer 1026 adopts ceramic structured packing, and the thickness is 500 mm.
The organic exhaust gas emission is shown in table 2 below,
TABLE 2
| Contaminants | Removal rate | Discharge amount (t/a) | Discharge Rate (kg/h) | Emission concentration (mg/m)3) |
| DMF | 96％ | 1.32 | 0.166 | 20.75 |
| Chloropropene | 94％ | 0.047 | 0.006 | 0.75 |
| Triethylamine | 94％ | 0.017 | 0.0021 | 0.26 |
| TAIC | 90％ | 0.22 | 0.028 | 3.5 |
| Hydrochloric acid mist | 95％ | 0.13 | 0.029 | 3.63 |
As shown in fig. 1, the adsorber 1082 after saturation adsorption is switched to desorption state, heated and desorbed by water vapor at 140-142 ℃ and flow rate of 1.1 ton/h, and desorbed from top to bottom through the activated carbon bed, and the organic matters adsorbed in the activated carbon bed and the water vapor enter the condenser 112 for condensation; a small amount of non-condensable gas condensed by the condenser 112 returns to the front of the fan 110 for re-adsorption, condensed condensate enters the layering tank for gravity layering, upper organic matters enter the middle storage tank 114, and lower wastewater is discharged to a designated position and is easy to recycle.
As shown in figure 1, after the desorption of the adsorber 1082 is completed, fresh air is introduced to cool and dehumidify the activated carbon bed layer in the form of internal circulation, the temperature of the introduced fresh air is 20 ℃, and the flow rate is 2m3Hours, cycle time 8 hours. The equilibrium saturated adsorption capacity is improved by 20 percent, thereby improving the purification rate and the recovery rate.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The organic waste gas adsorption recovery purification process is characterized in that the organic waste gas comprises DMF, chloropropene, triethylamine, TAIC and hydrochloric acid mist, and the process comprises the following steps:
organic waste gas enters an adsorption tank through a spray tower and a surface cooler, the adsorption tank consists of three adsorbers, two adsorbers are used for regenerating, and the organic waste gas enters from the bottom of the adsorber and is adsorbed by an activated carbon bed layer from bottom to top;
the adsorption saturation of the absorber is changed into a desorption state, steam is used for heating desorption, the steam is desorbed from top to bottom through the activated carbon bed layer, and organic matters adsorbed in the activated carbon bed layer and the steam enter the condenser together for condensation;
a small amount of non-condensable gas condensed by the condenser returns to the front of the fan for re-adsorption, condensed condensate enters a layering tank for gravity layering, upper-layer organic matter enters an intermediate storage tank, and lower-layer wastewater is discharged to a designated position;
after the desorption of the adsorber is finished, introducing fresh air to cool and dehumidify the activated carbon bed layer in an internal circulation mode.
2. The organic waste gas adsorption recovery purification process according to claim 1,
the temperature of the steam used for heating and desorbing the adsorber is 140-142 ℃, and the flow rate is 1.1 ton/hour.
3. The organic waste gas adsorption recovery purification process according to claim 2,
in the cooling and dehumidifying stage, the temperature of introduced fresh air is 20 ℃, and the flow rate is 2m3Per hour, cycle time was 8 hours.
4. The organic waste gas adsorption recovery purification process according to claim 3,
the organic waste gas is subjected to dry filtration through a dry filter before being introduced into the adsorption tank.
5. The organic waste gas adsorption recovery purification process according to claim 4,
the activated carbon bed layer adopts a granular activated carbon adsorption material GAC, organic waste gas is powered by a fan, and negative pressure enters the activated carbon bed layer after entering the adsorption tank.
6. The organic waste gas adsorption recovery purification process according to claim 5,
the dry filter comprises primary filter cotton and secondary cloth bag filter.
7. The organic waste gas adsorption recovery purification process according to claim 6,
the refrigerating capacity of the surface cooler is 120kw, and the heat exchange area is 3m3。
8. The organic waste gas adsorption recovery purification process according to claim 7,
the spray tower comprises two alkali spray layers, a water spray layer and a demisting layer, wherein the spray layers are made of ceramic structured packing, have the thickness of 300mm and are made of silicon carbide nozzles; the defogging layer adopts ceramic structured packing and has the thickness of 500 mm.
9. The organic waste gas adsorption recovery purification process according to claim 8,
the model of the activated carbon bed layer is 2000mm 1100mm 1300mm, and the flow of the organic waste gas is 8000m3/h。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114768482A (en) * | 2022-03-09 | 2022-07-22 | 山东神驰石化有限公司 | Solvent recovery device of isoprene rubber device |
| CN115430398A (en) * | 2022-08-10 | 2022-12-06 | 中国石油化工股份有限公司 | High-performance adsorbent and preparation method and application thereof |
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2021
- 2021-06-15 CN CN202110661562.0A patent/CN113413726A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114768482A (en) * | 2022-03-09 | 2022-07-22 | 山东神驰石化有限公司 | Solvent recovery device of isoprene rubber device |
| CN115430398A (en) * | 2022-08-10 | 2022-12-06 | 中国石油化工股份有限公司 | High-performance adsorbent and preparation method and application thereof |
| CN115430398B (en) * | 2022-08-10 | 2024-02-09 | 中国石油化工股份有限公司 | High-performance adsorbent and preparation method and application thereof |
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Application publication date: 20210921 |