CN107670454B - Toluene waste gas vacuum cryogenic recovery system and recovery process thereof - Google Patents
Toluene waste gas vacuum cryogenic recovery system and recovery process thereof Download PDFInfo
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- CN107670454B CN107670454B CN201710980738.2A CN201710980738A CN107670454B CN 107670454 B CN107670454 B CN 107670454B CN 201710980738 A CN201710980738 A CN 201710980738A CN 107670454 B CN107670454 B CN 107670454B
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 title claims abstract description 188
- 239000002912 waste gas Substances 0.000 title claims abstract description 121
- 238000011084 recovery Methods 0.000 title claims abstract description 79
- 238000001179 sorption measurement Methods 0.000 claims abstract description 102
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000002904 solvent Substances 0.000 claims abstract description 72
- 239000007789 gas Substances 0.000 claims abstract description 69
- 238000001816 cooling Methods 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000009833 condensation Methods 0.000 claims abstract description 10
- 230000005494 condensation Effects 0.000 claims abstract description 10
- 238000003795 desorption Methods 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 29
- 239000000498 cooling water Substances 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 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
- 238000000034 method Methods 0.000 claims description 7
- 239000012466 permeate Substances 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 229920000742 Cotton Polymers 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims 1
- 239000000945 filler Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 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
- 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
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000004400 mucous membrane Anatomy 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 210000003169 central nervous system Anatomy 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 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
- 231100001224 moderate toxicity Toxicity 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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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
- B01D53/002—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 invention provides a toluene waste gas vacuum cryogenic recovery system and a recovery process thereof, wherein the recovery system comprises: the device comprises an air collecting box, an exhaust gas pretreatment unit, a centrifugal fan, an adsorption unit, a vacuum cryogenic unit and a cooling tower; the air collecting box, the waste gas pretreatment unit, the centrifugal fan and the adsorption unit are sequentially communicated through pipelines and used for purifying gas and recycling solvents, and meanwhile, the waste gas pretreatment unit and the vacuum cryogenic unit are further communicated with the cooling tower through pipelines and used for cooling the gas and condensing solvents. The recovery system and the recovery process for toluene waste gas vacuum deep cooling provided by the invention have the advantages that the toluene solvent removal rate in the waste gas can reach more than 95%, the solvent recovery rate can reach 85-90%, the recovery rate is high, the activated carbon adsorption with long service life is adopted, the frequent replacement of adsorption fillers is avoided, the operation cost is reduced, and meanwhile, the vacuum desorption deep condensation recovery is adopted, so that the recovery system and the recovery process can be used for occasions without steam sources, and the recovered organic matters have low water content and no secondary pollution.
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 vacuum deep cooling.
Background
During the production of electrical materials, a large amount of toluene-based organic waste gas, such as toluene or xylene (with trace amounts of paraffin), is generated. Toluene has certain toxicity, the steam has stimulation to human skin and mucous membrane, and simultaneously has anesthesia to central nervous system, long-term effect can affect liver and kidney functions, while xylene has moderate toxicity, the steam not only damages human mucous membrane and respiratory tract, but also has excitation and anesthesia effects, in a word, toluene organic waste gas can damage human body, and is discharged into the atmosphere to pollute the environment. As is clear from the properties, toluene and xylene are insoluble in water and soluble in various organic solvents, so that chemical absorption is generally used for purifying and absorbing toluene and xylene in industry, but a great deal of energy is consumed when separating and recovering the absorbent, toluene and xylene by distillation, so that the production cost is increased, and the recovery efficiency is not very high.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a toluene waste gas vacuum cryogenic recovery system and a toluene waste gas vacuum cryogenic recovery process, 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 vacuum cryogenic toluene exhaust gas, the recovery system comprising: the device comprises an air collecting box, an exhaust gas pretreatment unit, a centrifugal fan, an adsorption unit, a vacuum cryogenic unit and a cooling tower; the air collecting box is used for collecting and storing toluene waste gas; the waste gas pretreatment unit is used for filtering and cooling toluene waste gas from the air collecting box to the waste gas pretreatment unit; the toluene waste gas after filtration and cooling in the waste gas pretreatment unit is pumped into the adsorption unit through a centrifugal fan, the toluene waste gas gathered into the adsorption unit forms high-concentration solvent waste gas, and the purified gas is discharged into the atmosphere; the vacuum pump pumps out the high-concentration solvent waste gas in the adsorption unit to carry out deep condensation recovery; and the cooling tower is respectively connected with the waste gas pretreatment unit and the vacuum cryogenic unit and forms a circulation loop for providing cooling water.
As a further illustration of the recovery system according to the invention, the exhaust gas pretreatment unit preferably comprises a filter and a cooler; the air collecting box is communicated with the filter through a pipeline, the filter is communicated with the cooler through a pipeline, and the cooler is communicated with the centrifugal fan and the cooling tower through a pipeline and is used for cooling and reducing the temperature of waste gas.
As a further illustration of the recovery system according to the invention, a layer of filter cotton is preferably provided in the filter for filtering off solid particles from the exhaust gases.
As a further illustration of the recovery system according to the invention, it is preferred that the adsorption unit comprises several identical adsorption tanks, which are used alternately, so that the adsorption and desorption processes are performed simultaneously to ensure continuous operation of the recovery system.
As a further explanation of the recovery system according to the present invention, preferably, an activated carbon adsorption layer is provided in the adsorption unit for adsorbing the solvent in the exhaust gas, and the activated carbon adsorption layer is provided with a temperature measuring point.
As a further illustration of the recovery system according to the present invention, it is preferable that the activated carbon is a cylindrical coal-based granular activated carbon, and the activated carbon granules have a diameter of 2 to 4mm.
As a further illustration of the recovery system of the present invention, preferably, the vacuum cryogenic unit comprises a vacuum pump, a three-stage deep condensing unit, and a solvent reservoir; wherein, the vacuum pump is connected with the adsorption unit and the three-stage deep condensing device through a pipeline, and the three-stage deep condensing device is connected with the solvent storage tank and the cooling tower through a pipeline.
As a further illustration of the recovery system of the present invention, it is preferred that the three-stage deep condensing unit comprises a first condenser, a second condenser, and a third condenser; the first condenser is communicated with the vacuum pump, the second condenser, the solvent storage tank and the cooling tower through pipelines, the second condenser is communicated with the third condenser, the solvent storage tank and the cooling tower through pipelines, and the third condenser is communicated with the solvent storage tank and the cooling tower through pipelines.
In order to achieve another object of the present invention, the present invention also provides a recycling process using the recycling system, the process comprising the steps of:
step 1): the waste gas is collected and stored in a wind collecting box to be treated;
step 2): the waste gas in the air collecting box enters a waste gas pretreatment unit and is pretreated by a filter and a cooler so as to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas;
step 3): the low Wen Mochen waste gas is pumped into the adsorption unit by a high-pressure centrifugal fan;
step 4): the waste gas entering the adsorption unit passes through the activated carbon adsorption layer, the waste gas is adsorbed in the pores by the activated carbon, and air permeates the carbon layer, so that the gas reaching the discharge standard is discharged into the atmosphere through a discharge port at the top of the adsorption tank;
step 5): and the solvent in the activated carbon adsorption layer is pumped by a vacuum pump and then enters a three-stage deep condensing device for deep condensation to form liquid, and the liquid solvent enters a solvent storage tank for recovery and storage.
As a further illustration of the recovery process according to the invention, it is preferred that the exhaust gas in step 2) is cooled down to 40-45 ℃; in the step 3), the outlet air pressure of the centrifugal fan (3) is 0.11-0.15 MPa; the pressure of the vacuum pump (51) in the step 5) is 0.05-0.08 MPa.
The recovery system and the recovery process using the system provided by the invention have the advantages that the recovery rate of toluene solvent in the waste gas can reach more than 95%, the recovery rate of the solvent can reach 85-90%, the recovery rate is high, the adsorption of activated carbon with long service life is adopted, the frequent replacement of adsorption filler is avoided, the operation cost is reduced, and meanwhile, the recovery process using the vacuum desorption deep condensation can be used for occasions without steam sources, and the recovered organic matters have low water content and no secondary pollution.
Drawings
FIG. 1 is a schematic diagram of a recovery system for vacuum cryogenic toluene exhaust;
FIG. 2 is a schematic diagram showing the connection of an exhaust gas pretreatment unit of the recovery system for vacuum cryogenic toluene exhaust gas of the present invention;
FIG. 3 is a schematic diagram showing the connection of a vacuum cryogenic unit of a recovery system for vacuum cryogenic of toluene exhaust gas according to the present invention;
FIG. 4 is a schematic diagram showing the connection of three-stage deep condensing units of the recovery system for vacuum cryogenic toluene exhaust gas.
The reference numerals are explained as follows:
the device comprises a wind collecting box 1, an exhaust gas pretreatment unit 2, a filter 21, a cooler 22, a centrifugal fan 3, an adsorption unit 4, a vacuum deep cooling unit 5, a vacuum pump 51, a three-stage deep condensing device 52, a first condenser 521, a second condenser 522, a third condenser 523, a solvent storage tank 53 and a water cooling tower 6.
Detailed Description
For a further understanding of the structure, features, and other objects of the invention, reference should now be made in detail to the accompanying drawings of the preferred embodiments of the invention, which are illustrated in the accompanying drawings and are for purposes of illustrating the concepts of the invention and not for limiting the invention.
As shown in fig. 1, fig. 1 is a schematic diagram of a recovery system for vacuum cryogenic toluene exhaust gas according to the present invention, the recovery system comprising: the device comprises a wind collecting box 1, an exhaust gas pretreatment unit 2, a centrifugal fan 3, an adsorption unit 4, a vacuum cryogenic unit 5 and a cooling tower 6; the device comprises a wind collecting box 1, wherein the wind collecting box 1 is used for collecting and storing toluene waste gas; the waste gas pretreatment unit 2, toluene waste gas enters the waste gas pretreatment unit 2 from the air collecting box 1 for filtration and cooling; the adsorption unit 4 is used for adsorbing solvent and purifying waste gas, the toluene waste gas which is filtered and cooled in the waste gas pretreatment unit 2 is pumped into the adsorption unit 4 through the centrifugal fan 3, the toluene waste gas which is gathered into the adsorption unit 4 forms high-concentration solvent waste gas, and the purified gas is discharged into the atmosphere; the vacuum cryogenic unit 5, the vacuum pump pumps out the high concentration solvent waste gas in the adsorption unit 4 to carry out deep condensation recovery; and the cooling tower 6 is respectively connected with the exhaust gas pretreatment unit 2 and the vacuum cryogenic unit 5, and forms a circulation loop for providing cooling water. The cooling tower 6 further comprises a cooling water pipeline and a cooling water return pipeline, the cooling water pipeline is communicated with the tube side water inlets of the cooler and the condenser, the cooling water return pipeline is communicated with the tube side water outlets of the cooler and the condenser, and the pipelines for conveying gas are communicated with the shell side inlets and outlets of the cooler and the condenser, so that the heat transfer efficiency is improved, and the heat exchanger is convenient to clean. Preferably, the adsorption unit 4 comprises a plurality of identical adsorption tanks, which are used alternately, so that the adsorption and desorption processes are carried out simultaneously to ensure continuous operation of the recovery system; an active carbon adsorption layer is arranged in the adsorption unit 4 and is used for adsorbing the solvent in the waste gas; the activated carbon is cylindrical coal-based granular activated carbon, the diameter of the activated carbon granules is 2-4 mm, and the cylindrical activated carbon with the diameter of 2-4 mm can ensure good adsorption rate to a solvent, provide proper filler porosity, enable gas to smoothly pass through, and avoid the influence of excessive pressure drop on gas circulation.
As shown in fig. 2, fig. 2 is a schematic diagram showing connection of an exhaust gas pretreatment unit of a recovery system for vacuum cryogenic toluene exhaust gas according to the present invention, and the exhaust gas pretreatment unit 2 includes a filter 21 and a cooler 22; wherein the filter 21 is communicated with the air collecting box 1 and the cooler 22 through a pipeline, and the cooler 22 is communicated with the filter 21, the centrifugal fan 3 and the water cooling tower 6 through a pipeline for cooling and reducing the temperature of the exhaust gas. Preferably, a filter cotton layer is provided in the filter 21 for filtering and removing solid particles in the exhaust gas.
As shown in fig. 3, fig. 3 is a schematic diagram showing the connection of a vacuum cryogenic unit of a recovery system for vacuum cryogenic of toluene exhaust gas, and the vacuum cryogenic unit 5 comprises a vacuum pump 51, a three-stage deep condensing device 52 and a solvent storage tank 53; wherein, vacuum pump 51 is linked together with adsorption unit 4 and tertiary degree of depth condensing equipment 52 through the pipeline, tertiary degree of depth condensing equipment 52 is linked together with vacuum pump 51, solvent storage 53 and cooling tower 6 through the pipeline, and solvent storage 53 is linked together with tertiary degree of depth condensing equipment 52 through the pipeline. The adoption of three-stage condensation can avoid the excessive cold energy requirement of the first-stage condensation when the treatment capacity is large, improve the operation cost and also improve the condensation recovery efficiency.
As shown in fig. 4, fig. 4 is a schematic diagram showing the connection of a three-stage deep condensing device of a recovery system for vacuum deep cooling of toluene exhaust gas according to the present invention, wherein the three-stage deep condensing device 52 comprises a first condenser 521, the first condenser 521 is communicated with a vacuum pump 51, a second condenser 522, a solvent storage tank 53 and a cooling tower 6 through pipelines, the second condenser 522 is communicated with the first condenser 521, a third condenser 523, the solvent storage tank 53 and the cooling tower 6 through pipelines, and the third condenser 523 is communicated with the second condenser 522, the solvent storage tank 53 and the cooling tower 6 through pipelines.
Example 1
Step 1): collecting and sending the toluene waste gas into a wind collecting box 1 for storage;
step 2): conveying the toluene waste gas in the air collecting box 1 to the waste gas pretreatment unit 2 through a pipeline, namely, pretreating the toluene waste gas through a filter 21 and a cooler 22 in sequence to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas, and cooling the waste gas to 40 ℃;
step 3): the low Wen Mochen waste gas is pumped into the adsorption unit 4 by the high-pressure centrifugal fan 3, and the pressure of the air outlet fan of the low-temperature dust-free waste gas is 0.11MPa;
step 4): the waste gas enters an adsorption tank in an adsorption unit 4, and passes through an active carbon adsorption layer consisting of cylindrical coal-based granular active carbon with the diameter of 2mm in the tank, toluene solvent in the waste gas is adsorbed into pores of the active carbon, and air permeates through the carbon layer, so that gas reaching the emission standard is discharged into the atmosphere from an emission port at the top of the adsorption tank;
step 5): when the adsorption amount of the activated carbon in the adsorption tank reaches more than 95% of the total adsorption amount, the adsorption tank after the desorption is switched is continuously adsorbed, the vacuum pump 51 is started, the pressure of the vacuum pump 51 is set to be 0.05MPa, the solvent is pumped from the activated carbon layer of the adsorption tank to be desorbed and then is sent into the first condenser 521 to be condensed, the solvent condensed by the first condenser 521 is subjected to gas-liquid separation, the liquid is directly transferred to the solvent storage tank 53, the gas continuously enters the second condenser 522, the solvent condensed by the second condenser 522 is subjected to gas-liquid separation, the liquid is directly transferred to the solvent storage tank 53, the gas continuously enters the third condenser 523, and the liquid solvent condensed by the third condenser 523 is transferred to the solvent storage tank 53 to be recovered and stored.
The toluene solvent recovery rate of the recovery process of the toluene waste gas vacuum cryogenic recovery system provided by the invention is 85% through detection, the toluene solvent removal rate in the waste gas reaches 95%, and the emission standard is met.
Example 2
Step 1): collecting and sending the toluene waste gas into a wind collecting box 1 for storage;
step 2): conveying the toluene waste gas in the air collecting box 1 to the waste gas pretreatment unit 2 through a pipeline, namely, pretreating the toluene waste gas through a filter 21 and a cooler 22 in sequence to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas, and cooling the waste gas to 45 ℃;
step 3): the low Wen Mochen waste gas is pumped into the adsorption unit 4 by the high-pressure centrifugal fan 3, and the pressure of the air outlet fan of the low-temperature dust-free waste gas is 0.15MPa;
step 4): the waste gas enters an adsorption tank in an adsorption unit 4, and toluene solvent in the waste gas is adsorbed into pores of the activated carbon through an activated carbon adsorption layer consisting of cylindrical coal-based granular activated carbon with the diameter of 4mm in the tank, and air permeates through the carbon layer, so that the gas reaching the discharge standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank;
step 5): when the adsorption amount of the activated carbon in the adsorption tank reaches more than 95% of the total adsorption amount, the adsorption tank after the desorption is switched is continuously adsorbed, the vacuum pump 51 is started, the pressure of the vacuum pump 51 is set to be 0.08MPa, the solvent is pumped from the activated carbon layer of the adsorption tank to be desorbed and then is sent into the first condenser 521 to be condensed, the solvent condensed by the first condenser 521 is subjected to gas-liquid separation, the liquid is directly transferred to the solvent storage tank 53, the gas continuously enters the second condenser 522, the solvent condensed by the second condenser 522 is subjected to gas-liquid separation, the liquid is directly transferred to the solvent storage tank 53, the gas continuously enters the third condenser 523, and the liquid solvent condensed by the third condenser 523 is transferred to the solvent storage tank 53 to be recovered and stored.
The recovery process toluene solvent recovery rate of the toluene waste gas vacuum cryogenic recovery system provided by the invention is 90% through detection, the toluene solvent removal rate in the waste gas reaches 97%, and the emission standard is met.
Example 3
Step 1): collecting and sending the toluene waste gas into a wind collecting box 1 for storage;
step 2): conveying the toluene waste gas in the air collecting box 1 to the waste gas pretreatment unit 2 through a pipeline, namely, pretreating the toluene waste gas through a filter 21 and a cooler 22 in sequence to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas, and cooling the waste gas to 43 ℃;
step 3): the low Wen Mochen waste gas is pumped into the adsorption unit 4 by the high-pressure centrifugal fan 3, and the pressure of the air outlet fan of the low-temperature dust-free waste gas is 0.13MPa;
step 4): the waste gas enters an adsorption tank in an adsorption unit 4, and toluene solvent in the waste gas is adsorbed into pores of the activated carbon through an activated carbon adsorption layer consisting of cylindrical coal-based granular activated carbon with the diameter of 2mm in the tank, and air permeates through the carbon layer, so that the gas reaching the emission standard is discharged into the atmosphere from an emission port at the top of the adsorption tank;
step 5): when the adsorption amount of the activated carbon in the adsorption tank reaches more than 95% of the total adsorption amount, the adsorption tank after the desorption is switched is continuously adsorbed, the vacuum pump 51 is started, the pressure of the vacuum pump 51 is set to be 0.06MPa, the solvent is pumped out of the activated carbon layer of the adsorption tank to be desorbed and then is sent into the first condenser 521 to be condensed, the solvent condensed by the first condenser 521 is subjected to gas-liquid separation, the liquid is directly transferred to the solvent storage tank 53, the gas continuously enters the second condenser 522, the solvent condensed by the second condenser 522 is subjected to gas-liquid separation, the liquid is directly transferred to the solvent storage tank 53, the gas continuously enters the third condenser 523, and the liquid solvent condensed by the third condenser 523 is transferred to the solvent storage tank 53 to be recovered and stored.
The recovery process toluene solvent recovery rate of the toluene waste gas vacuum cryogenic recovery system provided by the invention is 87% through detection, the toluene solvent removal rate in waste gas reaches 96.5%, and the toluene waste gas vacuum cryogenic recovery system meets the emission standard.
Example 4
Step 1): collecting and sending the toluene waste gas into a wind collecting box 1 for storage;
step 2): conveying the toluene waste gas in the air collecting box 1 to the waste gas pretreatment unit 2 through a pipeline, namely, pretreating the toluene waste gas through a filter 21 and a cooler 22 in sequence to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas, and cooling the waste gas to 42.5 ℃;
step 3): the low Wen Mochen waste gas is pumped into the adsorption unit 4 by the high-pressure centrifugal fan 3, and the pressure of the air outlet fan of the low-temperature dust-free waste gas is 0.14MPa;
step 4): the waste gas enters an adsorption tank in an adsorption unit 4, and toluene solvent in the waste gas is adsorbed into pores of the activated carbon through an activated carbon adsorption layer consisting of cylindrical coal-based granular activated carbon with the diameter of 3mm in the tank, and air permeates through the carbon layer, so that the gas reaching the emission standard is discharged into the atmosphere from an emission port at the top of the adsorption tank;
step 5): when the adsorption amount of the activated carbon in the adsorption tank reaches more than 95% of the total adsorption amount, the adsorption tank after the desorption is switched is continuously adsorbed, the vacuum pump 51 is started, the pressure of the vacuum pump 51 is set to be 0.07MPa, the solvent is pumped from the activated carbon layer of the adsorption tank to be desorbed and then is sent into the first condenser 521 to be condensed, the solvent condensed by the first condenser 521 is subjected to gas-liquid separation, the liquid is directly transferred to the solvent storage tank 53, the gas continuously enters the second condenser 522, the solvent condensed by the second condenser 522 is subjected to gas-liquid separation, the liquid is directly transferred to the solvent storage tank 53, the gas continuously enters the third condenser 523, and the liquid solvent condensed by the third condenser 523 is transferred to the solvent storage tank 53 to be recovered and stored.
The recovery process toluene solvent recovery rate of the toluene waste gas vacuum cryogenic recovery system provided by the invention is 89%, the toluene solvent removal rate in waste gas reaches 96%, and the emission standard is met.
Example 5
Step 1): collecting and sending the toluene waste gas into a wind collecting box 1 for storage;
step 2): conveying the toluene exhaust gas in the air collecting box 1 to the exhaust gas pretreatment unit 2 through a pipeline, namely, pretreating the toluene exhaust gas through a filter 21 and a cooler 22 in sequence to filter solid particles in the exhaust gas and cool the gas to form low-temperature dust-free exhaust gas, and cooling the exhaust gas to 41 ℃;
step 3): the low Wen Mochen waste gas is pumped into the adsorption unit 4 by the high-pressure centrifugal fan 3, and the pressure of the air outlet fan of the low-temperature dust-free waste gas is 0.12MPa;
step 4): the waste gas enters an adsorption tank in an adsorption unit 4, and toluene solvent in the waste gas is adsorbed into pores of the activated carbon through an activated carbon adsorption layer consisting of cylindrical coal-based granular activated carbon with the diameter of 4mm in the tank, and air permeates through the carbon layer, so that the gas reaching the discharge standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank;
step 5): when the adsorption amount of the activated carbon in the adsorption tank reaches more than 95% of the total adsorption amount, the adsorption tank after the desorption is switched is continuously adsorbed, the vacuum pump 51 is started, the pressure of the vacuum pump 51 is set to be 0.055MPa, the solvent is pumped from the activated carbon layer of the adsorption tank to be desorbed and then is sent into the first condenser 521 to be condensed, the solvent condensed by the first condenser 521 is subjected to gas-liquid separation, the liquid is directly transferred to the solvent storage tank 53, the gas continuously enters the second condenser 522, the solvent condensed by the second condenser 522 is subjected to gas-liquid separation, the liquid is directly transferred to the solvent storage tank 53, the gas continuously enters the third condenser 523, and the liquid solvent condensed by the third condenser 523 is transferred to the solvent storage tank 53 to be recovered and stored.
The toluene solvent recovery rate of the recovery process of the toluene waste gas vacuum cryogenic recovery system provided by the invention is 85.5%, the toluene solvent removal rate in waste gas reaches 96.5%, and the system meets the emission standard.
It should be noted that the foregoing summary and the detailed description are intended to demonstrate practical applications of the technical solution provided by the present invention, and should not be construed as limiting the scope of the present invention. Various modifications, equivalent alterations, or improvements will occur to those skilled in the art, and are within the spirit and principles of the invention. The scope of the invention is defined by the appended claims.
Claims (8)
1. A toluene waste gas vacuum cryogenic recovery system, the recovery system comprising: the device comprises a wind collecting box (1), an exhaust gas pretreatment unit (2), a centrifugal fan (3), an adsorption unit (4), a vacuum cryogenic unit (5) and a cooling tower (6); wherein,
a wind collecting box (1), wherein the wind collecting box (1) is used for collecting and storing toluene waste gas;
the waste gas pretreatment unit (2) is used for filtering and cooling toluene waste gas from the air collecting box (1) into the waste gas pretreatment unit (2);
the adsorption unit (4) is used for pumping the filtered and cooled toluene waste gas in the waste gas pretreatment unit (2) into the adsorption unit (4) through the centrifugal fan (3), the toluene waste gas gathered into the adsorption unit (4) forms high-concentration solvent waste gas, and the purified gas is discharged into the atmosphere;
the vacuum deep cooling unit (5) pumps out the high-concentration solvent waste gas in the adsorption unit (4) to perform deep condensation recovery; the vacuum cryogenic unit (5) comprises a vacuum pump (51), a three-stage deep condensing device (52) and a solvent storage tank (53); the vacuum pump (51) is communicated with the adsorption unit (4) and the three-stage deep condensing device (52) through a pipeline, the three-stage deep condensing device (52) comprises a first condenser (521), a second condenser (522) and a third condenser (523), the first condenser (521) is communicated with the vacuum pump (51), the second condenser (522), the solvent storage tank (53) and the water cooling tower (6) through pipelines, the second condenser (522) is communicated with the third condenser (523), the solvent storage tank (53) and the water cooling tower (6) through pipelines, and the third condenser (523) is communicated with the solvent storage tank (53) and the water cooling tower (6) through pipelines;
the cooling tower (6), the cooling tower (6) is connected with the waste gas pretreatment unit (2) and the vacuum cryogenic unit (5) respectively and forms a circulation loop for providing cooling water; the cooling water tower (6) comprises a cooling water pipeline and a cooling water return pipeline, the cooling water pipeline is communicated with the tube side water inlet of the cooler and the condenser, the cooling water return pipeline is communicated with the tube side water outlet of the cooler and the condenser, and the pipelines for conveying gas are communicated with the shell side inlet and outlet of the cooler and the condenser.
2. The recovery system according to claim 1, characterized in that the exhaust gas pretreatment unit (2) comprises a filter (21) and a cooler (22); the air collecting box (1) is communicated with the filter (21) through a pipeline, the filter (21) is communicated with the cooler (22) through a pipeline, and the cooler (22) is communicated with the centrifugal fan (3) and the cooling tower (6) through a pipeline and is used for cooling and reducing the temperature of waste gas.
3. A recovery system as claimed in claim 2, characterized in that a layer of filter cotton is provided in the filter (21) for filtering off solid particles in the exhaust gases.
4. Recovery system according to claim 1, characterized in that the adsorption unit (4) comprises several identical adsorption tanks, which are used alternately, so that the adsorption and desorption processes are performed simultaneously to ensure continuous operation of the recovery system.
5. The recovery system as claimed in claim 4, characterized in that an activated carbon adsorption layer is provided in the adsorption unit (4) for adsorbing the solvent in the exhaust gas, said activated carbon adsorption layer being provided with temperature measuring points.
6. The recovery system of claim 5, wherein the activated carbon is a cylindrical coal-based granular activated carbon, and wherein the activated carbon granules have a diameter of 2 to 4mm.
7. A recycling process employing the recycling system of any one of claims 1 to 6, characterized in that the process comprises the steps of:
step 1): the waste gas is collected and stored in a wind collecting box (1) to be treated;
step 2): the waste gas in the air collecting box (1) enters a waste gas pretreatment unit (2), and is pretreated by a filter (21) and a cooler (22) to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas;
step 3): the low Wen Mochen waste gas is pumped into the adsorption unit (4) by the high-pressure centrifugal fan (3);
step 4): the waste gas entering the adsorption unit (4) passes through the activated carbon adsorption layer, the waste gas is adsorbed in the pores by the activated carbon, and the air permeates through the carbon layer, so that the gas reaching the emission standard is discharged into the atmosphere from the discharge port at the top of the adsorption tank;
step 5): the solvent in the activated carbon adsorption layer is pumped out by a vacuum pump (51) and then enters a three-stage deep condensing device (52) for deep condensation to form liquid, and the liquid solvent enters a solvent storage tank (53) for recovery and storage.
8. The recovery process of claim 7, wherein the exhaust gas in step 2) is cooled to 40-45 ℃; in the step 3), the outlet air pressure of the centrifugal fan (3) is 0.11-0.15 MPa; the pressure of the vacuum pump (51) in the step 5) is 0.05-0.08 MPa.
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| CN112057886B (en) * | 2020-09-09 | 2022-03-25 | 山东交通学院 | On-site volatile solvent recovery device and recovery method |
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