CN107670454A - A kind of recovery system and its recovery process of toluene waste gas vacuum deep cooling - Google Patents
A kind of recovery system and its recovery process of toluene waste gas vacuum deep cooling Download PDFInfo
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- CN107670454A CN107670454A CN201710980738.2A CN201710980738A CN107670454A CN 107670454 A CN107670454 A CN 107670454A CN 201710980738 A CN201710980738 A CN 201710980738A CN 107670454 A CN107670454 A CN 107670454A
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 title claims abstract description 210
- 239000002912 waste gas Substances 0.000 title claims abstract description 141
- 238000011084 recovery Methods 0.000 title claims abstract description 71
- 238000001816 cooling Methods 0.000 title claims abstract description 59
- 239000002904 solvent Substances 0.000 claims abstract description 64
- 238000001179 sorption measurement Methods 0.000 claims abstract description 50
- 239000007789 gas Substances 0.000 claims abstract description 46
- 238000009833 condensation Methods 0.000 claims abstract description 27
- 230000005494 condensation Effects 0.000 claims abstract description 27
- 239000003610 charcoal Substances 0.000 claims abstract description 10
- 238000003795 desorption Methods 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 83
- 239000007788 liquid Substances 0.000 claims description 29
- 239000002245 particle Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 239000003245 coal Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 3
- 239000005416 organic matter Substances 0.000 abstract description 2
- 239000000112 cooling gas Substances 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 description 11
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 10
- 238000007664 blowing Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 230000003444 anaesthetic effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000004400 mucous membrane Anatomy 0.000 description 2
- 150000003613 toluenes Chemical class 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 210000003169 central nervous system Anatomy 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003907 kidney function Effects 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
- 231100001224 moderate toxicity Toxicity 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- 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
- B01D53/002—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
-
- 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
- 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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- 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)
Abstract
The present invention provides a kind of recovery system and its recovery process of toluene waste gas vacuum deep cooling, and the recovery system includes：Air collecting box, waste gas pretreatment unit, centrifugal blower, absorbing unit, vacuum cryogenic unit and cooling tower；Wherein, air collecting box, waste gas pretreatment unit, centrifugal blower, absorbing unit pass sequentially through pipeline connection, for purification gas and recycling design, while waste gas pretreatment unit and vacuum cryogenic unit are also connected by pipeline with cooling tower, for cooling gas and condensing solvent.The recovery system and its recovery process of toluene waste gas vacuum deep cooling provided by the invention are to toluene solvant clearance in waste gas up to more than 95%, solvent recovering rate is up to 85~90%, the rate of recovery is high, and using the charcoal absorption of long life, avoid frequently changing adsorption stuffing, reduce operating cost, reclaimed simultaneously using vacuum desorption deep condensation, available for without vapour source occasion, and it is low to reclaim organic matter water content, non-secondary pollution.
Description
Technical field
The present invention relates to a kind of recovery system of organic exhaust gas and its recovery process, specifically, is related to a kind of toluene and gives up
The recovery system and its recovery process of gas vacuum deep cooling.
Background technology
Substantial amounts of toluene class organic exhaust gas can be produced in the production process of electrical material, as toluene or dimethylbenzene (carry
Micro paraffin).Toluene has certain toxicity, and its steam has stimulation to human body skin, mucous membrane, while Central nervous system has
Anesthetic effect, long term can influence hepatic and renal function, and dimethylbenzene has moderate toxicity, and its steam removes infringement human body mucous membrane, exhaled
Inhale outside road, excited, anesthetic effect is also presented, toluene class organic exhaust gas not only can cause to damage to the body of people in a word, be discharged into
Also polluted the environment in air.It was found from its property, toluene and dimethylbenzene are not soluble in water, are dissolved in a variety of organic solvents, therefore
Industrial generally use chemical absorption method purification absorbs toluene and dimethylbenzene, but using way of distillation separation and recovery absorbent and
But need to consume substantial amounts of energy when toluene, dimethylbenzene, improve production cost, and organic efficiency is nor very high.
The content of the invention
It is deep it is an object of the invention to provide a kind of toluene waste gas vacuum in place of solving above-mentioned the deficiencies in the prior art
Cold recovery system and its recovery process, the defects of to overcome in the prior art.
To achieve these goals, the invention provides a kind of recovery system of toluene waste gas vacuum deep cooling, the recovery
System includes：Air collecting box, waste gas pretreatment unit, centrifugal blower, absorbing unit, vacuum cryogenic unit and cooling tower；Wherein, collect
Bellows, air collecting box are used to collect and store toluene waste gas；Waste gas pretreatment unit, toluene waste gas enter waste gas in advance by air collecting box
Reason unit is filtered and cooled down；Absorbing unit, in waste gas pretreatment unit by the toluene waste gas of filtering and cooling by from
Heart blower fan is pumped in absorbing unit, and the toluene waste gas gathered in absorbing unit forms high concentration solvent waste gas, is cleaned
Gas be discharged into air；High concentration solvent waste gas in absorbing unit is extracted out and carried out deeply by vacuum cryogenic unit, vavuum pump
Degree condensation recovery；Cooling tower, cooling tower are connected with waste gas pretreatment unit and vacuum cryogenic unit and form circulation loop respectively,
For providing cooling water.
As the further explanation to recovery system of the present invention, it is preferable that waste gas pretreatment unit includes filtering
Device and cooler；Wherein, air collecting box is connected by pipeline with filter, and filter is connected by pipeline with cooler, cold
But device is connected by pipeline with centrifugal blower and cooling tower, and the temperature of waste gas is reduced for cooling down.
As the further explanation to recovery system of the present invention, it is preferable that be provided with filter cotton layer in filter, use
In filtering off the solid particle in removing exhaust gas.
As the further explanation to recovery system of the present invention, it is preferable that it is identical that absorbing unit includes several
Adsorption tank, the adsorption tank is used alternatingly, to adsorb and desorption process while to carry out to ensure that recovery system is continuously run.
As the further explanation to recovery system of the present invention, it is preferable that activated carbon is provided with absorbing unit and is inhaled
Attached layer, for adsorbing the solvent in waste gas, the activated carbon adsorption layer is provided with temperature measuring point.
As the further explanation to recovery system of the present invention, it is preferable that the activated carbon is cylindricality coal base
Grain activated carbon, a diameter of 2~4mm of the activated carbon granule.
As the further explanation to recovery system of the present invention, it is preferable that vacuum cryogenic unit include vavuum pump,
Three-level deep condensation device and solvent tank；Wherein, vavuum pump passes through pipeline and absorbing unit and three-level deep condensation device phase
Connection, three-level deep condensation device are connected by pipeline with solvent tank and cooling tower.
As the further explanation to recovery system of the present invention, it is preferable that three-level deep condensation device includes the
One condenser, the second condenser and the 3rd condenser；Wherein, the first condenser passes through pipeline and vavuum pump, the second condenser, molten
Agent storage tank is connected with cooling tower, and the second condenser is connected by pipeline with the 3rd condenser, solvent tank and cooling tower, and the 3rd is cold
Condenser is connected by pipeline with solvent tank and cooling tower.
In order to realize another object of the present invention, present invention also offers a kind of recovery work using the recovery system
Skill, the technique comprise the following steps：
Step 1)：Waste gas is pending in air collecting box through collecting and being stored in；
Step 2)：Waste gas in air collecting box enters waste gas pretreatment unit, is pre-processed by filter and cooler, with mistake
Filter the solid particle in waste gas and gas cooling is cooled, to form the dustless waste gas of low temperature；
Step 3)：The dustless waste gas of low temperature is pumped into absorbing unit by centrifugal high pressure fan；
Step 4)：It is tightly held by activated carbon into the waste gas in absorbing unit by activated carbon adsorption layer, waste gas in hole,
Air permeable layer of charcoal, the gas for reaching discharge standard is set to be discharged into by adsorption tank top discharge mouth in air；
Step 5)：Solvent in activated carbon adsorption layer carries out depth by entering three-level deep condensation device after vacuum pumped
Condensation turns into liquid, and liquid flux enters back into solvent tank and carries out recovery storage.
As the further explanation to recovery process of the present invention, it is preferable that the waste gas in step 2) cools
To 40~45 DEG C；Centrifugal blower (3) outlet air pressure is 0.11~0.15MPa in step 3)；Step 5) intermediate pump (51) pressure
For 0.05~0.08MPa.
The recovery system of toluene waste gas vacuum deep cooling provided by the invention and the recovery process of the application system are to waste gas
Middle toluene solvant clearance is up to more than 95%, and for solvent recovering rate up to 85~90%, the rate of recovery is high, and uses the longevity using length
The charcoal absorption of life, avoid frequently changing adsorption stuffing, reduce operating cost, while return using vacuum desorption deep condensation
Receive, available for without vapour source occasion, and it is low to reclaim organic matter water content, non-secondary pollution.
Brief description of the drawings
Fig. 1 is the recovery system schematic diagram of toluene waste gas vacuum deep cooling of the present invention；
Fig. 2 is the recovery system waste gas pretreatment unit connection diagram of toluene waste gas vacuum deep cooling of the present invention；
Fig. 3 is the recovery system vacuum cryogenic unit connection diagram of toluene waste gas vacuum deep cooling of the present invention；
Fig. 4 is the recovery system three-level deep condensation device connection diagram of toluene waste gas vacuum deep cooling of the present invention.
Description of reference numerals is as follows：
Air collecting box 1, waste gas pretreatment unit 2, filter 21, cooler 22, centrifugal blower 3, absorbing unit 4, vacuum are deep
Cold unit 5, vavuum pump 51, three-level deep condensation device 52, the first condenser 521, the second condenser 522, the 3rd condenser
523rd, solvent tank 53 and cooling tower 6.
Embodiment
It is attached in conjunction with appended preferred embodiment in order to further appreciate that structure, feature and the other purposes of the present invention
As follows with accompanying drawing detailed description, this accompanying drawing embodiment described is merely to illustrate technical scheme, and non-limiting
Invention.
As shown in figure 1, Fig. 1 is the recovery system schematic diagram of toluene waste gas vacuum deep cooling of the present invention, the recovery system bag
Include：Air collecting box 1, waste gas pretreatment unit 2, centrifugal blower 3, absorbing unit 4, vacuum cryogenic unit 5 and cooling tower 6；Wherein, collect
Bellows 1, air collecting box 1 are used to collect and store toluene waste gas；Waste gas pretreatment unit 2, toluene waste gas enter waste gas by air collecting box 1
Pretreatment unit 2 is filtered and cooled down；Absorbing unit 4 is used for adsorption solvent, purification waste gas, is passed through in waste gas pretreatment unit 2
The toluene waste gas of filtering and cooling is pumped in absorbing unit 4 by centrifugal blower 3, gathers the first in absorbing unit 4
Benzene exhaust air forms high concentration solvent waste gas, and cleaned gas is discharged into air；Vacuum cryogenic unit 5, vavuum pump will adsorb
High concentration solvent waste gas in unit 4, which is extracted out, carries out deep condensation recovery；Cooling tower 6, cooling tower 6 pre-process single with waste gas respectively
Member 2 and vacuum cryogenic unit 5 connect and form circulation loop, for providing cooling water.Wherein cooling tower 6 includes cooling water pipe again
Road and CWR road, cooling water pipeline connect with the tube side water inlet of cooler and condenser, CWR road
Connected with the tube side delivery port of cooler and condenser, the pipeline for transmitting gas is imported and exported with the shell side of cooler and condenser
Connection, this be in order to improve heat transfer efficiency, also for be easy to clean heat exchanger.Preferably, it is identical to include several for absorbing unit 4
Adsorption tank, the adsorption tank is used alternatingly, to adsorb and desorption process while to carry out to ensure that recovery system is continuously run；
Activated carbon adsorption layer is provided with absorbing unit 4, for adsorbing the solvent in waste gas；The activated carbon is cylindricality coal-based granular activity
Charcoal, a diameter of 2~4mm of the activated carbon granule, the cylindricality activated carbons of 2~4mm diameters can both ensure good to solvent
Adsorption rate, appropriate filler porosity can be provided again, pass through gas, avoid pressure drop is excessive from influenceing gas circulation.
As shown in Fig. 2 Fig. 2 is the recovery system waste gas pretreatment unit connection signal of toluene waste gas vacuum deep cooling of the present invention
Figure, waste gas pretreatment unit 2 include filter 21 and cooler 22；Wherein, filter 21 passes through pipeline and air collecting box 1 and cooling
Device 22 is connected, and cooler 22 is connected by pipeline with filter 21, centrifugal blower 3 and cooling tower 6, is given up for cooling down to reduce
The temperature of gas.Preferably, filter cotton layer is provided with filter 21, for filtering off the solid particle in removing exhaust gas.
As shown in figure 3, Fig. 3 is the recovery system vacuum cryogenic unit connection signal of toluene waste gas vacuum deep cooling of the present invention
Figure, vacuum cryogenic unit 5 include vavuum pump 51, three-level deep condensation device 52 and solvent tank 53；Wherein, vavuum pump 51 passes through
Pipeline is connected with absorbing unit 4 and three-level deep condensation device 52, and three-level deep condensation device 52 passes through pipeline and vavuum pump
51st, solvent tank 53 is connected with cooling tower 6, and solvent tank 53 is connected by pipeline with three-level deep condensation device 52.Adopt
One-level condensation was excessive to the demand of cold when can both avoid treating capacity big with three-level condensation, improves running cost, can also carry
Height condensation organic efficiency.
As shown in figure 4, the recovery system three-level deep condensation device connection that Fig. 4 is toluene waste gas vacuum deep cooling of the present invention is shown
It is intended to, three-level deep condensation device 52 includes the first condenser 521, and the first condenser 521 passes through pipeline and vavuum pump 51, second
Condenser 522, solvent tank 53 connect with cooling tower 6, and the second condenser 522 is cold by pipeline and the first condenser the 521, the 3rd
Condenser 523, solvent tank 53 connect with cooling tower 6, and the 3rd condenser 523 passes through pipeline and the second condenser 522, solvent tank
53 connect with cooling tower 6.
Embodiment 1
Step 1)：Toluene waste gas is collected and fed into air collecting box 1 and stored；
Step 2)：By the toluene waste gas in air collecting box 1 by Pipeline transport to waste gas pretreatment unit 2, even if toluene gives up
Gas is successively pre-processed by filter 21 and cooler 22, to filter the solid particle in waste gas and gas cooling is cooled, with
The dustless waste gas of low temperature is formed, waste gas cools to 40 DEG C；
Step 3)：The dustless waste gas of low temperature is pumped into absorbing unit 4 by centrifugal high pressure fan 3, the low temperature without
The blowing machine pressure of dirt waste gas is 0.11MPa；
Step 4)：Waste gas enter absorbing unit 4 in adsorption tank, by groove by a diameter of 2mm cylindricality coal-based granular
The activated carbon adsorption layer of activated carbon composition, the toluene solvant in waste gas are adsorbed onto in the hole of activated carbon, air permeable layer of charcoal, made
The gas for reaching discharge standard is discharged into air by adsorption tank top discharge mouth；
Step 5)：When adsorption tank absorption certain time, the adsorbance of activated carbon reaches more than the 95% of total adsorbance in groove
When, the adsorption tank that desorption is completed in switching continues to adsorb, and starts vavuum pump 51, and sets the pressure of vavuum pump 51 as 0.05MPa,
It is sent into the first condenser 521 and condenses after solvent is extracted out from wait the active carbon layer for the adsorption tank being desorbed, through the first condenser
After gas-liquid separation, liquid is transferred directly in solvent tank 53 521 condensed solvents, and gas goes successively to the second condenser
522, through 522 condensed solvent of the second condenser after gas-liquid separation, liquid is transferred directly in solvent tank 53, gas after
It is continuous to enter the 3rd condenser 523, it is sent in solvent tank 53 and is reclaimed through 523 condensed liquid flux of the 3rd condenser
Storage.
The recovery process toluene solvant of application toluene waste gas vacuum cryogenic recovery system provided by the invention reclaims after testing
Rate is 85%, and toluene solvant clearance reaches 95% in waste gas, meets discharge standard.
Embodiment 2
Step 1)：Toluene waste gas is collected and fed into air collecting box 1 and stored；
Step 2)：By the toluene waste gas in air collecting box 1 by Pipeline transport to waste gas pretreatment unit 2, even if toluene gives up
Gas is successively pre-processed by filter 21 and cooler 22, to filter the solid particle in waste gas and gas cooling is cooled, with
The dustless waste gas of low temperature is formed, waste gas cools to 45 DEG C；
Step 3)：The dustless waste gas of low temperature is pumped into absorbing unit 4 by centrifugal high pressure fan 3, the low temperature without
The blowing machine pressure of dirt waste gas is 0.15MPa；
Step 4)：Waste gas enter absorbing unit 4 in adsorption tank, by groove by a diameter of 4mm cylindricality coal-based granular
The activated carbon adsorption layer of activated carbon composition, the toluene solvant in waste gas is adsorbed onto in the hole of activated carbon, air permeable layer of charcoal,
The gas for reaching discharge standard is set to be discharged into by adsorption tank top discharge mouth in air；
Step 5)：When adsorption tank absorption certain time, the adsorbance of activated carbon reaches more than the 95% of total adsorbance in groove
When, the adsorption tank that desorption is completed in switching continues to adsorb, and starts vavuum pump 51, and sets the pressure of vavuum pump 51 as 0.08MPa,
It is sent into the first condenser 521 and condenses after solvent is extracted out from wait the active carbon layer for the adsorption tank being desorbed, through the first condenser
After gas-liquid separation, liquid is transferred directly in solvent tank 53 521 condensed solvents, and gas goes successively to the second condenser
522, through 522 condensed solvent of the second condenser after gas-liquid separation, liquid is transferred directly in solvent tank 53, gas after
It is continuous to enter the 3rd condenser 523, it is sent in solvent tank 53 and is reclaimed through 523 condensed liquid flux of the 3rd condenser
Storage.
The recovery process toluene solvant of application toluene waste gas vacuum cryogenic recovery system provided by the invention reclaims after testing
Rate is 90%, and toluene solvant clearance reaches 97% in waste gas, meets discharge standard.
Embodiment 3
Step 1)：Toluene waste gas is collected and fed into air collecting box 1 and stored；
Step 2)：By the toluene waste gas in air collecting box 1 by Pipeline transport to waste gas pretreatment unit 2, even if toluene gives up
Gas is successively pre-processed by filter 21 and cooler 22, to filter the solid particle in waste gas and gas cooling is cooled, with
The dustless waste gas of low temperature is formed, waste gas cools to 43 DEG C；
Step 3)：The dustless waste gas of low temperature is pumped into absorbing unit 4 by centrifugal high pressure fan 3, the low temperature without
The blowing machine pressure of dirt waste gas is 0.13MPa；
Step 4)：Waste gas enter absorbing unit 4 in adsorption tank, by groove by a diameter of 2mm cylindricality coal-based granular
The activated carbon adsorption layer of activated carbon composition, the toluene solvant in waste gas is adsorbed onto in the hole of activated carbon, air permeable layer of charcoal,
The gas for reaching discharge standard is set to be discharged into by adsorption tank top discharge mouth in air；
Step 5)：When adsorption tank absorption certain time, the adsorbance of activated carbon reaches more than the 95% of total adsorbance in groove
When, the adsorption tank that desorption is completed in switching continues to adsorb, and starts vavuum pump 51, and sets the pressure of vavuum pump 51 as 0.06MPa,
It is sent into the first condenser 521 and condenses after solvent is extracted out from wait the active carbon layer for the adsorption tank being desorbed, through the first condenser
After gas-liquid separation, liquid is transferred directly in solvent tank 53 521 condensed solvents, and gas goes successively to the second condenser
522, through 522 condensed solvent of the second condenser after gas-liquid separation, liquid is transferred directly in solvent tank 53, gas after
It is continuous to enter the 3rd condenser 523, it is sent in solvent tank 53 and is reclaimed through 523 condensed liquid flux of the 3rd condenser
Storage.
The recovery process toluene solvant of application toluene waste gas vacuum cryogenic recovery system provided by the invention reclaims after testing
Rate is 87%, and toluene solvant clearance reaches 96.5% in waste gas, meets discharge standard.
Embodiment 4
Step 1)：Toluene waste gas is collected and fed into air collecting box 1 and stored；
Step 2)：By the toluene waste gas in air collecting box 1 by Pipeline transport to waste gas pretreatment unit 2, even if toluene gives up
Gas is successively pre-processed by filter 21 and cooler 22, to filter the solid particle in waste gas and gas cooling is cooled, with
The dustless waste gas of low temperature is formed, waste gas cools to 42.5 DEG C；
Step 3)：The dustless waste gas of low temperature is pumped into absorbing unit 4 by centrifugal high pressure fan 3, the low temperature without
The blowing machine pressure of dirt waste gas is 0.14MPa；
Step 4)：Waste gas enter absorbing unit 4 in adsorption tank, by groove by a diameter of 3mm cylindricality coal-based granular
The activated carbon adsorption layer of activated carbon composition, the toluene solvant in waste gas is adsorbed onto in the hole of activated carbon, air permeable layer of charcoal,
The gas for reaching discharge standard is set to be discharged into by adsorption tank top discharge mouth in air；
Step 5)：When adsorption tank absorption certain time, the adsorbance of activated carbon reaches more than the 95% of total adsorbance in groove
When, the adsorption tank that desorption is completed in switching continues to adsorb, and starts vavuum pump 51, and sets the pressure of vavuum pump 51 as 0.07MPa,
It is sent into the first condenser 521 and condenses after solvent is extracted out from wait the active carbon layer for the adsorption tank being desorbed, through the first condenser
After gas-liquid separation, liquid is transferred directly in solvent tank 53 521 condensed solvents, and gas goes successively to the second condenser
522, through 522 condensed solvent of the second condenser after gas-liquid separation, liquid is transferred directly in solvent tank 53, gas after
It is continuous to enter the 3rd condenser 523, it is sent in solvent tank 53 and is reclaimed through 523 condensed liquid flux of the 3rd condenser
Storage.
The recovery process toluene solvant of application toluene waste gas vacuum cryogenic recovery system provided by the invention reclaims after testing
Rate is 89%, and toluene solvant clearance reaches 96% in waste gas, meets discharge standard.
Embodiment 5
Step 1)：Toluene waste gas is collected and fed into air collecting box 1 and stored；
Step 2)：By the toluene waste gas in air collecting box 1 by Pipeline transport to waste gas pretreatment unit 2, even if toluene gives up
Gas is successively pre-processed by filter 21 and cooler 22, to filter the solid particle in waste gas and gas cooling is cooled, with
The dustless waste gas of low temperature is formed, waste gas cools to 41 DEG C；
Step 3)：The dustless waste gas of low temperature is pumped into absorbing unit 4 by centrifugal high pressure fan 3, the low temperature without
The blowing machine pressure of dirt waste gas is 0.12MPa；
Step 4)：Waste gas enter absorbing unit 4 in adsorption tank, by groove by a diameter of 4mm cylindricality coal-based granular
The activated carbon adsorption layer of activated carbon composition, the toluene solvant in waste gas is adsorbed onto in the hole of activated carbon, air permeable layer of charcoal,
The gas for reaching discharge standard is set to be discharged into by adsorption tank top discharge mouth in air；
Step 5)：When adsorption tank absorption certain time, the adsorbance of activated carbon reaches more than the 95% of total adsorbance in groove
When, switching complete desorption adsorption tank continue to adsorb, start vavuum pump 51, and set the pressure of vavuum pump 51 as
0.055MPa, it is sent into the first condenser 521 and condenses after solvent is extracted out from wait the active carbon layer for the adsorption tank being desorbed, through the
After gas-liquid separation, liquid is transferred directly in solvent tank 53 one condenser, 521 condensed solvent, and gas goes successively to
Two condensers 522, through 522 condensed solvent of the second condenser after gas-liquid separation, liquid is transferred directly to solvent tank 53
In, gas goes successively to the 3rd condenser 523, and solvent tank 53 is sent to through 523 condensed liquid flux of the 3rd condenser
In carry out recovery storage.
The recovery process toluene solvant of application toluene waste gas vacuum cryogenic recovery system provided by the invention reclaims after testing
Rate is 85.5%, and toluene solvant clearance reaches 96.5% in waste gas, meets discharge standard.
It is to be understood that foregoing invention content and embodiment are intended to prove technical scheme provided by the present invention
Practical application, it should not be construed as limiting the scope of the present invention.Those skilled in the art are in spirit and principles of the present invention
It is interior, when can various modifications may be made, equivalent substitution or improvement.Protection scope of the present invention is defined by appended claims.
Claims (10)
1. a kind of recovery system of toluene waste gas vacuum deep cooling, it is characterised in that the recovery system includes：Air collecting box (1), give up
Gas pretreatment unit (2), centrifugal blower (3), absorbing unit (4), vacuum cryogenic unit (5) and cooling tower (6)；Wherein,
Air collecting box (1), air collecting box (1) are used to collect and store toluene waste gas；
Waste gas pretreatment unit (2), toluene waste gas are filtered and cooled down into waste gas pretreatment unit (2) by air collecting box (1)；
Absorbing unit (4), the interior toluene waste gas by filtering and cooling of waste gas pretreatment unit (2) pass through centrifugal blower (3) quilt
Pump in absorbing unit (4), the toluene waste gas gathered in absorbing unit (4) forms high concentration solvent waste gas, is cleaned
Gas is discharged into air；
High concentration solvent waste gas in absorbing unit (4) is extracted out and carries out deep condensation time by vacuum cryogenic unit (5), vavuum pump
Receive；
Cooling tower (6), cooling tower (6) are connected with waste gas pretreatment unit (2) and vacuum cryogenic unit (5) and form circulation respectively
Loop, for providing cooling water.
2. recovery system as claimed in claim 1, it is characterised in that waste gas pretreatment unit (2) include filter (21) and
Cooler (22)；Wherein, air collecting box (1) is connected by pipeline with filter (21), and filter (21) passes through pipeline and cooling
Device (22) is connected, and cooler (22) is connected by pipeline with centrifugal blower (3) and cooling tower (6), is given up for cooling down to reduce
The temperature of gas.
3. recovery system as claimed in claim 2, it is characterised in that filter cotton layer is provided with filter (21), for filtering
The solid particle gone in removing exhaust gas.
4. recovery system as claimed in claim 1, it is characterised in that absorbing unit (4) includes several identical adsorption tanks,
The adsorption tank is used alternatingly, to adsorb and desorption process while to carry out to ensure that recovery system is continuously run.
5. recovery system as claimed in claim 4, it is characterised in that be provided with activated carbon adsorption layer in absorbing unit (4), be used for
The solvent in waste gas is adsorbed, the activated carbon adsorption layer is provided with temperature measuring point.
6. recovery system as claimed in claim 5, it is characterised in that the activated carbon is cylindricality coal-based granular activated carbon, institute
State a diameter of 2~4mm of activated carbon granule.
7. recovery system as claimed in claim 1, it is characterised in that vacuum cryogenic unit (5) includes vavuum pump (51), three-level
Deep condensation device (52) and solvent tank (53)；Wherein, vavuum pump (51) passes through pipeline and absorbing unit (4) and three-level depth
Condensing unit (52) is connected, and three-level deep condensation device (52) is connected by pipeline with solvent tank (53) and cooling tower (6)
It is logical.
8. recovery system as claimed in claim 7, it is characterised in that three-level deep condensation device (52) includes the first condenser
(521), the second condenser (522) and the 3rd condenser (523)；Wherein, the first condenser (521) passes through pipeline and vavuum pump
(51), the second condenser (522), solvent tank (53) connect with cooling tower (6), and the second condenser (522) passes through pipeline and
Three condensers (523), solvent tank (53) connect with cooling tower (6), and the 3rd condenser (523) passes through pipeline and solvent tank
(53) connected with cooling tower (6).
A kind of 9. recovery process for applying the recovery system as described in claim 1~8 is any, it is characterised in that the technique
Comprise the following steps：
Step 1)：Waste gas is pending in air collecting box (1) through collecting and being stored in；
Step 2)：Waste gas in air collecting box (1) enters waste gas pretreatment unit (2), passes through filter (21) and cooler (22)
Pretreatment, to filter the solid particle in waste gas and make gas cooling cool, to form the dustless waste gas of low temperature；
Step 3)：The dustless waste gas of low temperature is pumped into absorbing unit (4) by centrifugal high pressure fan (3)；
Step 4)：It is tightly held by activated carbon into the waste gas in absorbing unit (4) by activated carbon adsorption layer, waste gas in hole,
Air permeable layer of charcoal, the gas for reaching discharge standard is set to be discharged into by adsorption tank top discharge mouth in air；
Step 5)：Solvent in activated carbon adsorption layer enters three-level deep condensation device (52) after being extracted out by vavuum pump (51) to be carried out
Deep condensation turns into liquid, and liquid flux enters back into solvent tank (53) and carries out recovery storage.
10. recovery process as claimed in claim 9, it is characterised in that the waste gas in step 2) cools to 40~45 DEG C；
Centrifugal blower (3) outlet air pressure is 0.11~0.15MPa in step 3)；Step 5) intermediate pump (51) pressure be 0.05~
0.08MPa。
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