CN107715648A - A kind of recovery system and its recovery process of toluene waste gas steam desorption - Google Patents
A kind of recovery system and its recovery process of toluene waste gas steam desorption Download PDFInfo
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- CN107715648A CN107715648A CN201710980739.7A CN201710980739A CN107715648A CN 107715648 A CN107715648 A CN 107715648A CN 201710980739 A CN201710980739 A CN 201710980739A CN 107715648 A CN107715648 A CN 107715648A
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 239000002912 waste gas Substances 0.000 title claims abstract description 76
- 238000011084 recovery Methods 0.000 title claims abstract description 55
- 238000003795 desorption Methods 0.000 title claims abstract description 41
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 126
- 238000001179 sorption measurement Methods 0.000 claims abstract description 124
- 239000002904 solvent Substances 0.000 claims abstract description 96
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 239000003960 organic solvent Substances 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000009833 condensation Methods 0.000 claims abstract description 6
- 230000005494 condensation Effects 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 41
- 239000007789 gas Substances 0.000 claims description 23
- 230000005484 gravity Effects 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 12
- 239000002699 waste material Substances 0.000 claims description 12
- 239000011148 porous material Substances 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 238000004064 recycling Methods 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000008929 regeneration Effects 0.000 claims description 7
- 238000011069 regeneration method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 claims description 6
- 238000004065 wastewater treatment Methods 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 5
- 239000008096 xylene Substances 0.000 description 5
- 238000010926 purge Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000010815 organic waste Substances 0.000 description 3
- 206010002091 Anaesthesia Diseases 0.000 description 2
- 230000037005 anaesthesia Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 210000004400 mucous membrane Anatomy 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 210000003169 central nervous system Anatomy 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000003907 kidney function Effects 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 230000003908 liver function Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- B01D53/02—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
-
- 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
-
- 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
- B01D2257/702—Hydrocarbons
- B01D2257/7027—Aromatic hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The present invention provides a kind of recovery system and its recovery process of toluene waste gas steam desorption, and the recovery system includes waste gas pretreatment unit, absorbing unit, desorption cooling unit and condensation separation unit tower；Wherein, solvent off-air is collected into air collecting box, solvent and waste gas are formed after the pretreatment of waste gas pretreatment unit, and pumped to by centrifugal blower in absorbing unit, absorbing unit includes the adsorption tank equipped with activated carbon adsorption layer, the adsorption tank is connected with steam generator, and the solvent for heating adsorbed makes it be generated as gaseous solvent；Gaseous solvent is cooled to organic solvent and water vapour and isolates organic solvent by desorption cooling unit.The present invention is adsorbed using pressure-fired, the operation process of tiny structure desorption, is built favourable absorption and desorption conditions for activated carbon, so as to improve the treatment effect of retracting device, is reduced operating cost.
Description
Technical Field
The invention relates to a recovery system and a recovery process of organic waste gas, in particular to a recovery system and a recovery process of toluene waste gas steam desorption.
Background
In the production of electrical materials, large amounts of toluene-based organic waste gases, such as toluene or xylene (with traces of paraffins), are produced. Toluene has certain toxicity, steam of toluene has stimulation effect on skin and mucous membrane of human body, and simultaneously has anesthesia effect on central nervous system, long-term effect can affect liver and kidney function, xylene has medium toxicity, steam of toluene has excitation and anesthesia effects besides injuring mucous membrane and respiratory tract of human body, in a word, toluene organic waste gas can not only cause injury to human body, but also pollute environment when discharged into atmosphere. As can be seen from the properties, toluene and xylene are both insoluble in water and soluble in various organic solvents, so the industrial chemical absorption method is usually adopted to purify and absorb toluene and xylene, but when the distillation method is adopted to separate and recover the absorbent, toluene and xylene, a large amount of energy is consumed, the production cost is increased, and the recovery efficiency is not very high.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a recovery system and a recovery process for toluene waste gas steam desorption, so as to overcome the defects in the prior art.
In order to achieve the above object, the present invention provides a recovery system for toluene off-gas steam desorption, comprising: the device comprises an air collecting box, a waste gas pretreatment unit, a centrifugal fan, an adsorption unit, a desorption cooling unit and a condensation separation unit; the waste gas pretreatment unit comprises a filter and a cooler; collecting solvent waste air into an air collecting box, sequentially pretreating the solvent waste air through a filter and a cooler to form a solvent and waste air, and pumping the solvent and the waste air into an adsorption unit through a centrifugal fan; the adsorption unit comprises an adsorption tank provided with an active carbon adsorption layer and is used for adsorbing a solvent and purifying waste gas; the adsorption tank is connected with the steam generator and is used for heating the adsorbed solvent to generate gaseous solvent; the desorption cooling unit comprises a cooling fan, a vacuum fan, a cooler and a gas-liquid separator; wherein, the vacuum fan sucks the gaseous solvent in the adsorption tank, the gaseous solvent is cooled into an organic solvent and water vapor by a cooler, and the organic solvent is separated by a vapor-liquid separator; the cooling fan blows and cools the adsorption tank and the activated carbon adsorption layer; the condensation separation unit comprises a condenser, a buffer separator, a specific gravity separation tank and a solvent storage tank; wherein, the organic solvent and the water vapor in the cooler and the organic solvent in the vapor-liquid separator enter a condenser to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank through a buffer separator to be automatically separated, and the separated solvent liquid enters a solvent storage tank; the water cooling tower is connected with the waste gas pretreatment unit, the cooler and the condenser and forms a circulating loop to provide cooling water.
As a further description of the recovery system according to the present invention, it is preferable that the adsorption unit is provided with at least three adsorption tanks to alternately perform the adsorption process and the desorption process while ensuring continuous operation of the recovery system.
As a further description of the recovery system of the present invention, preferably, a liquid level sensor is disposed at the top of the adsorption tank, and when the solvent is adsorbed to the top of the adsorption tank, the steam generator automatically injects low-pressure steam into the adsorption tank.
As a further description of the recovery system of the present invention, preferably, the activated carbon adsorption layer is provided with a temperature measuring point and an alarm device, and when the activated carbon reaches an alarm temperature in the adsorption process, the alarm device automatically alarms and switches to enter the desorption process, so as to ensure the safe operation of the recovery system.
As a further description of the recycling system of the present invention, preferably, the activated carbon adsorption layer is made of coal-based granular activated carbon, and the diameter of the activated carbon granules is 2-4 mm.
As a further description of the recycling system of the present invention, preferably, a centrifugal fan motor frequency converter is additionally installed on the centrifugal fan to realize frequency modulation and speed change according to different exhaust emissions.
As a further description of the recycling system of the present invention, it is preferable that a filter cotton layer is disposed in the filter for filtering and removing solid particles in the exhaust gas.
In order to achieve another object of the present invention, the present invention also provides a recovery process using the recovery system for toluene off-gas steam desorption, the recovery process comprising the steps of:
step 1): collecting solvent waste air discharged from the production line and sending the collected air into an air collecting box for treatment;
step 2): waste gas in the air collecting box enters a waste gas pretreatment unit, is pretreated by a filter and a cooler in sequence to form a solvent and waste gas, and is pumped into an adsorption unit by a centrifugal fan;
step 3): the solvent and the waste gas entering the adsorption unit pass through the activated carbon adsorption layer, the solvent is adsorbed in the pores by the activated carbon, the waste gas penetrates through the carbon layer, and finally the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank;
step 4): when the solvent adsorbed in the pores by the activated carbon reaches the top of the adsorption tank, the steam generator automatically introduces low-pressure steam into the adsorption tank, and heats the adsorbed solvent to generate a gaseous solvent;
step 5): starting a vacuum fan to suck the gaseous solvent in the adsorption tank to regenerate the activated carbon, starting a cooling fan to sweep the adsorption tank and the activated carbon adsorption layer after regeneration is finished, and switching the adsorption tank to an adsorption state after the temperature is reduced to normal temperature;
step 6): after organic solvent and water vapor desorbed from the surface of the active carbon enter a condenser and are condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank for automatic separation, the separated solvent liquid enters a solvent storage tank, and the wastewater is directly discharged to a wastewater treatment plant.
As a further description of the recovery process of the present invention, preferably, the exhaust gas in step 2) is cooled to 40 to 45 ℃; the air pressure at the outlet of the centrifugal fan is 0.11-0.15 MPa.
The recovery system for toluene waste gas steam desorption and the recovery process using the system provided by the invention adopt a micro-positive pressure adsorption and micro-negative pressure desorption operation process, so that favorable adsorption and desorption conditions are created for activated carbon, the treatment effect of the recovery device is improved, vacuum-assisted desorption is adopted, the steam consumption is low, the operation cost is reduced, and the removal rate of toluene solvent in the waste gas can reach more than 95%.
Drawings
FIG. 1 is a schematic view of a recovery system for toluene waste gas steam desorption according to the present invention.
Detailed Description
To further understand the structure, characteristics and other objects of the present invention, the following detailed description is given with reference to the accompanying preferred embodiments, which are only used to illustrate the technical solutions of the present invention and are not to limit the present invention.
As shown in fig. 1, fig. 1 is a schematic view of a recovery system for toluene off-gas steam desorption according to the present invention, wherein the recovery system comprises: the device comprises an air collecting box 1, a waste gas pretreatment unit 2, a centrifugal fan 3, an adsorption unit 4, a desorption cooling unit 5 and a condensation separation unit 6; the air collecting box 1 is communicated with the waste gas pretreatment unit 2 through a pipeline, and the waste gas pretreatment unit 2 comprises a filter and a cooler; collecting solvent waste air into an air collecting box 1, sequentially performing pretreatment through a filter and a cooler to form a solvent and waste gas, reducing the temperature of the waste gas discharged from the cooler to 40-45 ℃, and pumping the waste gas into an adsorption unit 4 through a high-pressure centrifugal fan 3; preferably, centrifugal fan 3 installs centrifugal fan motor converter additional to realize carrying out frequency modulation variable speed according to different exhaust emissions. And a filter cotton layer is arranged in the filter and used for filtering and removing solid particles in the waste gas.
The adsorption unit 4 comprises an adsorption tank provided with an activated carbon adsorption layer and is used for adsorbing a solvent and purifying waste gas; when the solvent waste gas passes through the activated carbon layer, the solvent waste gas is adsorbed in the pores by the activated carbon, air penetrates through the activated carbon layer, and the tail gas meeting the emission requirement is discharged to the atmosphere from a discharge port at the top of the adsorption tank; the adsorption tank is connected with a steam generator 41 and used for heating the adsorbed solvent to generate gaseous solvent; preferably, the adsorption unit 4 is provided with at least three adsorption tanks to alternately perform an adsorption process and a desorption process while ensuring continuous operation of the recovery system. The top of the adsorption tank is provided with a liquid level sensor, and when the solvent is adsorbed to the top of the adsorption tank, the steam generator 41 automatically introduces low-pressure steam into the adsorption tank. The active carbon adsorption layer is provided with a temperature measuring point and an alarm device, and when the active carbon reaches the alarm temperature in the adsorption process, the alarm device automatically alarms and switches to enter the desorption process so as to ensure the operation safety of the recovery system.
Preferably, the activated carbon adsorption layer is made of coal-based granular activated carbon, and the diameter of the activated carbon granules is 2-4 mm. The coal-based granular activated carbon is very suitable for repeated adsorption and desorption occasions of the solvent volatile gas, has very good desorption performance, can resist the temperature naturally up to 450 ℃, can effectively ensure the regeneration effect of a system, greatly reduces the frequency of hot spots, and has the best safety of industrial application.
The desorption cooling unit 5 includes a cooling fan 51, a vacuum fan 52, a cooler 53, and a gas-liquid separator 54; wherein, the vacuum fan 52 sucks the gaseous solvent in the adsorption tank, the gaseous solvent is cooled into the organic solvent and the water vapor by the cooler 53, and the organic solvent is separated by the vapor-liquid separator 54; the cooling fan 51 blows and cools the adsorption tank and the activated carbon adsorption layer; the adsorption tank adsorbs a certain period of time, when the top of the adsorption tank is about to penetrate through, the system automatically introduces low-pressure steam to heat the gas solvent, then the vacuum fan is started to suck, so that the activated carbon is regenerated, the cooling fan is started to purge and cool the adsorption tank and the activated carbon after the activated carbon regeneration (desorption) is finished, and the adsorption tank and the activated carbon are switched to an adsorption state after the temperature is reduced to the normal temperature
The condensation-separation unit 6 includes a condenser 61, a buffer separator 62, a specific gravity separation tank 63, and a solvent storage tank 64; wherein, the organic solvent and the water vapor in the cooler 53 and the organic solvent in the vapor-liquid separator 54 enter the condenser 61 to be condensed into a mixed liquid, the mixed liquid enters the specific gravity separation tank 63 through the buffer separator 62 to be automatically separated, and the separated solvent liquid enters the solvent storage tank 64. After organic solvent and water vapor desorbed from the surface of the active carbon enter a condenser and are condensed into liquid, the mixed liquid enters a specific gravity separation tank for automatic separation, the separated solvent liquid enters a storage tank, and the wastewater is directly discharged to a wastewater treatment plant.
The water cooling tower 7 is connected with the waste gas pretreatment unit 2, the cooler 53 and the condenser 61 to form a circulation loop so as to continuously provide cooling water, ensure that the temperature of the waste gas discharged from the cooler can be reduced to 40-45 ℃, ensure that the gaseous solvent is cooled into the organic solvent and the water vapor through the cooler 53, and ensure that the organic solvent and the water vapor in the cooler 53 and the organic solvent in the vapor-liquid separator 54 enter the condenser 61 to be condensed into a mixed liquid.
The invention also provides a recovery process of the recovery system for toluene waste gas steam desorption, which comprises the following steps:
example 1
Step 1): solvent waste air discharged from the production line is collected and sent into a wind collecting box 1 to be treated.
Step 2): waste gas in the air collecting box 1 enters a waste gas pretreatment unit 2, and is pretreated by a filter and a cooler in sequence to form a solvent and waste gas so as to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas, and the waste gas is cooled to 40 ℃; and pumped into the adsorption unit 4 by the centrifugal fan 3, wherein the air pressure at the outlet of the centrifugal fan 3 is 0.11 Mpa.
Step 3): the solvent and the waste gas entering the adsorption unit 4 pass through an activated carbon adsorption layer consisting of columnar coal-based granular activated carbon with the diameter of 2mm, the solvent is adsorbed in the pores by the activated carbon, the waste gas penetrates through the carbon layer, and finally the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank.
Step 4): when the solvent adsorbed in the pores by the activated carbon reaches the top of the adsorption tank, i.e., when the total adsorption amount is more than 95%, the steam generator 41 automatically introduces low-pressure steam into the adsorption tank, and heats the adsorbed solvent to generate a gaseous solvent.
Step 5): the vacuum fan 52 is started to suck the gaseous solvent in the adsorption tank to regenerate the activated carbon, the cooling fan 51 is started to purge the adsorption tank and the activated carbon adsorption layer after regeneration is finished, and the adsorption tank is switched to an adsorption state after the temperature is reduced to normal temperature.
Step 6): organic solvent and water vapor desorbed from the surface of the activated carbon enter a condenser 61 to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank 63 to be automatically separated, the separated solvent liquid enters a solvent storage tank 64, and the wastewater is directly discharged to a wastewater treatment plant.
The detection shows that the recovery rate of the toluene solvent in the recovery process of the toluene waste gas steam desorption recovery system provided by the invention is 85%, the removal rate of the toluene solvent in the waste gas reaches 95%, and the toluene waste gas steam desorption recovery system meets the emission standard.
Example 2
Step 1): solvent waste air discharged from the production line is collected and sent into a wind collecting box 1 to be treated.
Step 2): waste gas in the air collecting box 1 enters a waste gas pretreatment unit 2, and is pretreated by a filter and a cooler in sequence to form a solvent and waste gas so as to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas, and the waste gas is cooled to 45 ℃; and pumped into the adsorption unit 4 by the centrifugal fan 3, wherein the air pressure at the outlet of the centrifugal fan 3 is 0.15 Mpa.
Step 3): the solvent and the waste gas entering the adsorption unit 4 pass through an activated carbon adsorption layer consisting of cylindrical coal-based granular activated carbon with the diameter of 4mm, the solvent is adsorbed in the pores by the activated carbon, the waste gas penetrates through the carbon layer, and finally the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank.
Step 4): when the solvent adsorbed in the pores by the activated carbon reaches the top of the adsorption tank, i.e., when the total adsorption amount is more than 95%, the steam generator 41 automatically introduces low-pressure steam into the adsorption tank, and heats the adsorbed solvent to generate a gaseous solvent.
Step 5): the vacuum fan 52 is started to suck the gaseous solvent in the adsorption tank to regenerate the activated carbon, the cooling fan 51 is started to purge the adsorption tank and the activated carbon adsorption layer after regeneration is finished, and the adsorption tank is switched to an adsorption state after the temperature is reduced to normal temperature.
Step 6): organic solvent and water vapor desorbed from the surface of the activated carbon enter a condenser 61 to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank 63 to be automatically separated, the separated solvent liquid enters a solvent storage tank 64, and the wastewater is directly discharged to a wastewater treatment plant.
The detection shows that the recovery rate of the toluene solvent in the recovery process of the toluene waste gas steam desorption recovery system provided by the invention is 90%, the removal rate of the toluene solvent in the waste gas reaches 97%, and the toluene waste gas steam desorption recovery system meets the emission standard.
Example 3
Step 1): solvent waste air discharged from the production line is collected and sent into a wind collecting box 1 to be treated.
Step 2): waste gas in the air collecting box 1 enters a waste gas pretreatment unit 2, and is pretreated by a filter and a cooler in sequence to form a solvent and waste gas so as to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas, wherein the waste gas is cooled to 43 ℃; and pumped into the adsorption unit 4 by the centrifugal fan 3, wherein the air pressure at the outlet of the centrifugal fan 3 is 0.13 Mpa.
Step 3): the solvent and the waste gas entering the adsorption unit 4 pass through an activated carbon adsorption layer consisting of cylindrical coal-based granular activated carbon with the diameter of 3mm, the solvent is adsorbed in the pores by the activated carbon, the waste gas penetrates through the carbon layer, and finally the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank.
Step 4): when the solvent adsorbed in the pores by the activated carbon reaches the top of the adsorption tank, i.e., when the total adsorption amount is more than 95%, the steam generator 41 automatically introduces low-pressure steam into the adsorption tank, and heats the adsorbed solvent to generate a gaseous solvent.
Step 5): the vacuum fan 52 is started to suck the gaseous solvent in the adsorption tank to regenerate the activated carbon, the cooling fan 51 is started to purge the adsorption tank and the activated carbon adsorption layer after regeneration is finished, and the adsorption tank is switched to an adsorption state after the temperature is reduced to normal temperature.
Step 6): organic solvent and water vapor desorbed from the surface of the activated carbon enter a condenser 61 to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank 63 to be automatically separated, the separated solvent liquid enters a solvent storage tank 64, and the wastewater is directly discharged to a wastewater treatment plant.
The detection shows that the recovery rate of the toluene solvent in the recovery process of the toluene waste gas steam desorption recovery system provided by the invention is 87%, the removal rate of the toluene solvent in the waste gas reaches 96.5%, and the toluene waste gas steam desorption recovery system meets the emission standard.
It should be noted that the above summary and the detailed description are intended to demonstrate the practical application of the technical solutions provided by the present invention, and should not be construed as limiting the scope of the present invention. Various modifications, equivalent substitutions, or improvements may be made by those skilled in the art within the spirit and principles of the invention. The scope of the invention is to be determined by the appended claims.
Claims (9)
1. A recovery system for toluene exhaust gas steam desorption, characterized in that the recovery system comprises: the device comprises an air collecting box (1), a waste gas pretreatment unit (2), a centrifugal fan (3), an adsorption unit (4), a desorption cooling unit (5), a condensation separation unit (6) and a water cooling tower (7); wherein,
the air collecting box (1) is communicated with the waste gas pretreatment unit (2) through a pipeline, and the waste gas pretreatment unit (2) comprises a filter and a cooler; solvent waste air is collected into an air collecting box (1), is pretreated by a filter and a cooler in sequence to form a solvent and waste air, and is pumped into an adsorption unit (4) through a centrifugal fan (3);
the adsorption unit (4) comprises an adsorption tank provided with an activated carbon adsorption layer and is used for adsorbing a solvent and purifying waste gas; the adsorption tank is connected with a steam generator (41) and is used for heating the adsorbed solvent to generate gaseous solvent;
the desorption cooling unit (5) comprises a cooling fan (51), a vacuum fan (52), a cooler (53) and a gas-liquid separator (54); wherein, a vacuum fan (52) sucks the gaseous solvent in the adsorption tank, the gaseous solvent is cooled into an organic solvent and water vapor by a cooler (53), and the organic solvent is separated by a vapor-liquid separator (54); a cooling fan (51) blows and cools the adsorption tank and the activated carbon adsorption layer;
the condensation separation unit (6) comprises a condenser (61), a buffer separator (62), a specific gravity separation tank (63) and a solvent storage tank (64); wherein, the organic solvent and the water vapor in the cooler (53) and the organic solvent in the vapor-liquid separator (54) enter a condenser (61) to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank (63) through a buffer separator (62) to be automatically separated, and the separated solvent liquid enters a solvent storage tank (64);
a water cooling tower (7) is connected to the exhaust gas pretreatment unit (2), the cooler (53) and the condenser (61) and forms a circulation loop to provide cooling water.
2. A recovery system according to claim 1, characterized in that the adsorption unit (4) is provided with at least three adsorption tanks to alternately perform the adsorption process and the desorption process while ensuring continuous operation of the recovery system.
3. The recycling system according to claim 1 or 2, wherein the top of the adsorption tank is provided with a liquid level sensor, and the steam generator (41) automatically feeds low-pressure steam into the adsorption tank when the solvent is adsorbed to the top of the adsorption tank.
4. The recycling system of claim 1, wherein the activated carbon adsorption layer is provided with a temperature measuring point and an alarm device, and when the activated carbon reaches the alarm temperature in the adsorption process, the alarm device automatically alarms and switches to the desorption process so as to ensure the safe operation of the recycling system.
5. The recycling system according to claim 1, wherein the activated carbon adsorption layer is made of coal-based granular activated carbon, and the diameter of the activated carbon granules is 2-4 mm.
6. A recovery system according to claim 1, characterized in that the centrifugal fan (3) is additionally provided with a centrifugal fan motor frequency converter to realize frequency-modulated speed change according to different exhaust emissions.
7. The recycling system according to claim 1, wherein the filter is provided with a filter cotton layer for filtering and removing solid particles in the exhaust gas.
8. A recovery process of a recovery system for toluene waste gas steam desorption according to any one of claims 1 to 8, wherein the recovery process comprises the following steps:
step 1): solvent waste air discharged from the production line is collected and sent into a wind collecting box (1) to be treated;
step 2): waste gas in the air collecting box (1) enters a waste gas pretreatment unit (2), is pretreated by a filter and a cooler in sequence to form a solvent and waste gas, and is pumped into an adsorption unit (4) through a centrifugal fan (3);
step 3): the solvent and the waste gas entering the adsorption unit (4) pass through the activated carbon adsorption layer, the solvent is adsorbed in the pores by the activated carbon, the waste gas penetrates through the carbon layer, and finally the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank;
step 4): when the solvent adsorbed in the pores by the activated carbon reaches the top of the adsorption tank, the steam generator (41) automatically introduces low-pressure steam into the adsorption tank, and heats the adsorbed solvent to generate a gaseous solvent;
step 5): starting a vacuum fan (52) to suck the gaseous solvent in the adsorption tank to regenerate the activated carbon, starting a cooling fan (51) to sweep the adsorption tank and the activated carbon adsorption layer after regeneration is finished, and switching the adsorption tank to an adsorption state after the temperature is reduced to normal temperature;
step 6): organic solvent and water vapor desorbed from the surface of the activated carbon enter a condenser (61) to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank (63) to be automatically separated, the separated solvent liquid enters a solvent storage tank (64), and the wastewater is directly discharged to a wastewater treatment plant.
9. The recovery process according to claim 9, wherein the exhaust gas in the step 2) is cooled to 40-45 ℃; the air pressure at the outlet of the centrifugal fan (3) is 0.11-0.15 MPa.
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