CN207413079U - A kind of recovery system of toluene waste gas vacuum deep cooling - Google Patents
A kind of recovery system of toluene waste gas vacuum deep cooling Download PDFInfo
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- CN207413079U CN207413079U CN201721351984.3U CN201721351984U CN207413079U CN 207413079 U CN207413079 U CN 207413079U CN 201721351984 U CN201721351984 U CN 201721351984U CN 207413079 U CN207413079 U CN 207413079U
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 title claims abstract description 208
- 239000002912 waste gas Substances 0.000 title claims abstract description 135
- 238000011084 recovery Methods 0.000 title claims abstract description 62
- 238000001816 cooling Methods 0.000 title claims abstract description 45
- 238000001179 sorption measurement Methods 0.000 claims abstract description 100
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000002904 solvent Substances 0.000 claims abstract description 69
- 239000007789 gas Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000009833 condensation Methods 0.000 claims abstract description 22
- 230000005494 condensation Effects 0.000 claims abstract description 22
- 238000003795 desorption Methods 0.000 claims abstract description 10
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- 229920000742 Cotton Polymers 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
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- 239000005416 organic matter Substances 0.000 abstract description 2
- 239000000112 cooling gas Substances 0.000 abstract 1
- 238000000746 purification Methods 0.000 abstract 1
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- 229910052799 carbon Inorganic materials 0.000 description 6
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Abstract
The utility model provides a kind of recovery system of toluene waste gas vacuum deep cooling, and the recovery system includes：Air collecting box, exhaust gas pretreatment unit, centrifugal blower, absorbing unit, vacuum cryogenic unit and cooling tower；Wherein, air collecting box, exhaust gas pretreatment unit, centrifugal blower, absorbing unit pass sequentially through pipeline connection, for purification gas and recycling design, while exhaust 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 utility model are to toluene solvant removal rate in exhaust gas up to more than 95%, solvent recovering rate is up to 85~90%, the rate of recovery is high, and it using the activated carbon adsorption of long life, avoids frequently replacing adsorption stuffing, reduces operating cost, it is recycled simultaneously using vacuum desorption deep condensation, available for no vapour source occasion, and recycling organic matter water content is low, non-secondary pollution.
Description
Technical Field
The utility model relates to a recovery system of organic waste gas, specifically speaking relates to a recovery system of toluene waste gas vacuum cryrogenic.
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.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model aims to provide a recovery system for toluene waste gas vacuum deep cooling and a recovery process thereof, so as to overcome the defects in the prior art.
In order to realize the above object, the utility model provides a recovery system of toluene waste gas vacuum cryrogenic, recovery system includes: the system comprises an air collecting box, a waste gas pretreatment unit, a centrifugal fan, an adsorption unit, a vacuum deep cooling unit and a water cooling tower; the air collecting box is used for collecting and storing toluene waste gas; the toluene waste gas enters the waste gas pretreatment unit from the air collecting box for filtration and cooling; the toluene waste gas which is filtered and cooled in the waste gas pretreatment unit is pumped into the adsorption unit through a centrifugal fan, the toluene waste gas which is gathered in the adsorption unit forms high-concentration solvent waste gas, and the purified gas is discharged into the atmosphere; the vacuum deep cooling unit is used for pumping out the high-concentration solvent waste gas in the adsorption unit by a vacuum pump for deep condensation and recovery; and the cooling tower is respectively connected with the waste gas pretreatment unit and the vacuum cryogenic unit and forms a circulating loop for providing cooling water.
As a further illustration of the recovery system of the present invention, preferably, the exhaust gas pretreatment unit comprises a filter and a cooler; wherein, 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 water cooling tower through pipelines and used for cooling and reducing the temperature of the waste gas.
As a further explanation 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.
As a further explanation of the recycling system of the present invention, it is preferable that the adsorption unit includes a plurality of identical adsorption tanks, and the adsorption tanks are alternately used so that the adsorption and desorption processes are simultaneously performed to ensure continuous operation of the recycling system.
As right the recovery system of the utility model further explain, preferably, be equipped with the activated carbon adsorption layer in the adsorption unit for adsorb the solvent in the waste gas, the activated carbon adsorption layer is equipped with the temperature measurement point.
As a further explanation of the recycling system of the present invention, preferably, the activated carbon is cylindrical coal-based granular activated carbon, and the diameter of the activated carbon granules is 2-4 mm.
As a further illustration of the recovery system of the present invention, preferably, the vacuum cryogenic unit comprises a vacuum pump, a tertiary deep condensing unit, and a solvent storage tank; wherein, the vacuum pump is communicated with the adsorption unit and the third-level deep condensation device through pipelines, and the third-level deep condensation device is communicated with the solvent storage tank and the water cooling tower through pipelines.
As a further explanation of the recycling system of the present invention, preferably, the three-stage deep condensing device 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 water cooling tower through pipelines, the second condenser is communicated with the third condenser, the solvent storage tank and the water cooling tower through pipelines, and the third condenser is communicated with the solvent storage tank and the water cooling tower through pipelines.
In order to realize the other purpose of the utility model, the utility model discloses still provide an use recovery system's recovery technology, the technology includes following step:
step 1): collecting and storing the waste gas in a wind collecting box for treatment;
step 2): waste gas in the air collecting box enters a waste gas pretreatment unit, and is pretreated through 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): pumping the low-temperature dust-free waste gas into an 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 the air penetrates through the carbon layer, so that the gas reaching the emission standard is discharged into the atmosphere from a 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 and then enters a three-level deep condensation device for deep condensation to form liquid, and the liquid solvent enters a solvent storage tank for recovery and storage.
As a further explanation of the recycling process of the present invention, preferably, the exhaust gas in step 2) is cooled to 40-45 ℃; in the step 3), the air pressure at the outlet of the centrifugal fan (3) is 0.11-0.15 MPa; in the step 5), the pressure of the vacuum pump (51) is 0.05-0.08 MPa.
The utility model provides a recovery system and application of toluene waste gas vacuum cryrogenic toluene solvent clearance can reach more than 95% in to the waste gas of recovery technology of system, and the solvent rate of recovery can reach 85 ~ 90%, and the rate of recovery is high to adopt long life's activated carbon adsorption, avoid frequently changing the adsorption filler, reduce the running cost, adopt vacuum desorption degree of depth condensation to retrieve simultaneously, can be used to no steam source occasion, it is low to retrieve the organic matter water content moreover, no secondary pollution.
Drawings
FIG. 1 is a schematic view of a vacuum cryogenic recovery system for toluene waste gas according to the present invention;
FIG. 2 is a schematic view of the connection of the toluene waste gas vacuum cryogenic recovery system waste gas pretreatment unit of the present invention;
FIG. 3 is a schematic view of the connection of the vacuum cryogenic unit of the toluene waste gas vacuum cryogenic recovery system of the present invention;
figure 4 is the utility model discloses tertiary degree of depth condensing equipment of cryogenic recovery system in toluene waste gas vacuum connects the schematic diagram.
The reference numerals are explained below:
the system 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 cryogenic unit 5, a vacuum pump 51, a three-stage deep condensation 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
In order 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 solution of the present invention and are not intended to limit the present invention.
As shown in FIG. 1, FIG. 1 is a schematic view of the vacuum cryogenic recovery system for toluene waste gas of the present invention, the recovery system comprises: the system comprises an air collecting box 1, a waste gas pretreatment unit 2, a centrifugal fan 3, an adsorption unit 4, a vacuum deep cooling unit 5 and a water cooling tower 6; wherein, the air collecting box 1 is used for collecting and storing toluene waste gas; the toluene waste gas enters the waste gas pretreatment unit 2 from the wind collecting box 1 for filtration and cooling; the adsorption unit 4 is used for adsorbing a solvent and purifying waste gas, filtered and cooled toluene waste gas in the waste gas pretreatment unit 2 is pumped into the adsorption unit 4 through the centrifugal fan 3, the toluene waste gas collected in 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 is used for pumping out the high-concentration solvent waste gas in the adsorption unit 4 by a vacuum pump for deep condensation and recovery; and the water cooling tower 6 are respectively connected with the waste gas pretreatment unit 2 and the vacuum cryogenic unit 5 and form a circulating 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 a cooler and a tube pass water inlet of a condenser, the cooling water return pipeline is communicated with a tube pass water outlet of the cooler and a tube pass water outlet of the condenser, and pipelines for conveying gas are communicated with a shell pass inlet and a shell pass outlet of the cooler and the shell pass outlet of the condenser, so that the heat transfer efficiency is improved, and the heat exchanger is convenient to clean. Preferably, the adsorption unit 4 comprises several 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 activated carbon adsorption layer is arranged in the adsorption unit 4 and is used for adsorbing a 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 on a solvent and provide proper filler porosity, so that gas can smoothly pass through, and the gas circulation is prevented from being influenced by too large pressure drop.
As shown in fig. 2, fig. 2 is a schematic connection diagram of the waste gas pretreatment unit of the toluene waste gas vacuum cryogenic recovery system of the present invention, and the waste gas pretreatment unit 2 includes a filter 21 and a cooler 22; wherein, the filter 21 is communicated with the wind collecting box 1 and the cooler 22 through pipelines, and the cooler 22 is communicated with the filter 21, the centrifugal fan 3 and the water cooling tower 6 through pipelines and used for cooling and reducing the temperature of the waste gas. Preferably, the filter 21 is provided with a filter cotton layer for filtering and removing solid particles in the exhaust gas.
As shown in fig. 3, fig. 3 is a schematic diagram of the connection of the vacuum cryogenic unit of the toluene waste gas vacuum cryogenic recovery system of the present invention, and the vacuum cryogenic unit 5 includes a vacuum pump 51, a three-stage deep condensing device 52 and a solvent storage tank 53; wherein, the vacuum pump 51 is communicated with the adsorption unit 4 and the third-stage deep condensation device 52 through pipelines, the third-stage deep condensation device 52 is communicated with the vacuum pump 51, the solvent storage tank 53 and the water cooling tower 6 through pipelines, and the solvent storage tank 53 is communicated with the third-stage deep condensation device 52 through pipelines. By adopting three-level condensation, the requirement of one-level condensation on cold quantity can be avoided being overlarge when the treatment capacity is large, the operation cost is improved, and the condensation recovery efficiency can also be improved.
As shown in fig. 4, fig. 4 is the connection schematic diagram of the three-stage deep condensation device of the toluene waste gas vacuum cryogenic recovery system of the present invention, the three-stage deep condensation device 52 includes a first condenser 521, the first condenser 521 is communicated with the vacuum pump 51, the second condenser 522, the solvent storage tank 53 and the cooling tower 6 through a pipeline, the second condenser 522 is communicated with the first condenser 521, the third condenser 523, the solvent storage tank 53 and the cooling tower 6 through a pipeline, and the third condenser 523 is communicated with the second condenser 522, the solvent storage tank 53 and the cooling tower 6 through a pipeline.
Example 1
Step 1): collecting toluene waste gas and sending the toluene waste gas into a wind collecting box 1 for storage;
step 2): conveying the toluene waste gas in the wind collecting box 1 to a 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, wherein the cooling temperature of the waste gas is reduced to 40 ℃;
step 3): pumping the low-temperature dust-free waste gas into an adsorption unit 4 by a high-pressure centrifugal fan 3, wherein the air outlet pressure of the low-temperature dust-free waste gas is 0.11 MPa;
step 4): the waste gas enters an adsorption tank in the adsorption unit 4, a toluene solvent in the waste gas is adsorbed into pores of activated carbon through an activated carbon adsorption layer consisting of columnar 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 a discharge port at the top of the adsorption tank;
step 5): when the adsorption tank adsorbs for a certain time and the adsorption capacity of the activated carbon in the tank reaches more than 95% of the total adsorption capacity, the adsorption tank which finishes desorption is switched to continue adsorption, the vacuum pump 51 is started, the pressure of the vacuum pump 51 is set to be 0.05MPa, the solvent is pumped out 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 sent into the solvent storage tank 53, the gas continues to enter the second condenser 522, the solvent condensed by the second condenser 522 is subjected to gas-liquid separation, the liquid is directly sent into the solvent storage tank 53, the gas continues to enter the third condenser 523, and the liquid solvent condensed by the third condenser 523 is sent into the solvent storage tank 53 to be recycled and stored.
Through detecting and using the utility model provides a recovery process toluene solvent rate of recovery of toluene waste gas vacuum cryrogenic recovery system is 85%, and toluene solvent clearance reaches 95% in the waste gas, accords with emission standard.
Example 2
Step 1): collecting toluene waste gas and sending the toluene waste gas into a wind collecting box 1 for storage;
step 2): conveying the toluene waste gas in the wind collecting box 1 to a 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, wherein the cooling temperature of the waste gas is 45 ℃;
step 3): pumping the low-temperature dust-free waste gas into an adsorption unit 4 by a high-pressure centrifugal fan 3, wherein the air outlet pressure of the low-temperature dust-free waste gas is 0.15 MPa;
step 4): the waste gas enters an adsorption tank in the adsorption unit 4, a toluene solvent in the waste gas is adsorbed into pores of 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 penetrates through the carbon layer, so that the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank;
step 5): when the adsorption tank adsorbs for a certain time and the adsorption capacity of the activated carbon in the tank reaches more than 95% of the total adsorption capacity, the adsorption tank which finishes desorption is switched to continue adsorption, the vacuum pump 51 is started, the pressure of the vacuum pump 51 is set to be 0.08MPa, the solvent is pumped out 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 sent into the solvent storage tank 53, the gas continues to enter the second condenser 522, the solvent condensed by the second condenser 522 is subjected to gas-liquid separation, the liquid is directly sent into the solvent storage tank 53, the gas continues to enter the third condenser 523, and the liquid solvent condensed by the third condenser 523 is sent into the solvent storage tank 53 to be recycled and stored.
Through detecting and using the utility model provides a recovery process toluene solvent rate of recovery of toluene waste gas vacuum cryrogenic recovery system is 90%, and toluene solvent clearance reaches 97% in the waste gas, accords with emission standard.
Example 3
Step 1): collecting toluene waste gas and sending the toluene waste gas into a wind collecting box 1 for storage;
step 2): conveying the toluene waste gas in the wind collecting box 1 to a 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, wherein the cooling temperature of the waste gas is reduced to 43 ℃;
step 3): pumping the low-temperature dust-free waste gas into an adsorption unit 4 by a high-pressure centrifugal fan 3, wherein the air outlet pressure of the low-temperature dust-free waste gas is 0.13 MPa;
step 4): the waste gas enters an adsorption tank in the adsorption unit 4, a toluene solvent in the waste gas is adsorbed into pores of activated carbon through an activated carbon adsorption layer consisting of columnar coal-based granular activated carbon with the diameter of 2mm in the tank, and air penetrates through the carbon layer, so that the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank;
step 5): when the adsorption tank adsorbs for a certain time and the adsorption capacity of the activated carbon in the tank reaches more than 95% of the total adsorption capacity, the adsorption tank which finishes desorption is switched to continue adsorption, the vacuum pump 51 is started, the pressure of the vacuum pump 51 is set to be 0.06MPa, the solvent is pumped out 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 sent into the solvent storage tank 53, the gas continues to enter the second condenser 522, the solvent condensed by the second condenser 522 is subjected to gas-liquid separation, the liquid is directly sent into the solvent storage tank 53, the gas continues to enter the third condenser 523, and the liquid solvent condensed by the third condenser 523 is sent into the solvent storage tank 53 to be recycled and stored.
Through detecting and using the utility model provides a recovery process toluene solvent rate of recovery of toluene waste gas vacuum cryrogenic recovery system is 87%, and toluene solvent clearance reaches 96.5% in the waste gas, accords with emission standard.
Example 4
Step 1): collecting toluene waste gas and sending the toluene waste gas into a wind collecting box 1 for storage;
step 2): conveying the toluene waste gas in the wind collecting box 1 to a 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, wherein the waste gas is cooled to 42.5 ℃;
step 3): pumping the low-temperature dust-free waste gas into an adsorption unit 4 by a high-pressure centrifugal fan 3, wherein the air outlet pressure of the low-temperature dust-free waste gas is 0.14 MPa;
step 4): the waste gas enters an adsorption tank in the adsorption unit 4, a toluene solvent in the waste gas is adsorbed into pores of activated carbon through an activated carbon adsorption layer consisting of columnar coal-based granular activated carbon with the diameter of 3mm in the tank, and air penetrates through the carbon layer, so that the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank;
step 5): when the adsorption tank adsorbs for a certain time and the adsorption capacity of the activated carbon in the tank reaches more than 95% of the total adsorption capacity, the adsorption tank which finishes desorption is switched to continue adsorption, the vacuum pump 51 is started, the pressure of the vacuum pump 51 is set to be 0.07MPa, the solvent is pumped out 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 sent into the solvent storage tank 53, the gas continues to enter the second condenser 522, the solvent condensed by the second condenser 522 is subjected to gas-liquid separation, the liquid is directly sent into the solvent storage tank 53, the gas continues to enter the third condenser 523, and the liquid solvent condensed by the third condenser 523 is sent into the solvent storage tank 53 to be recycled and stored.
Through detecting and using the utility model provides a recovery process toluene solvent rate of recovery of toluene waste gas vacuum cryrogenic recovery system is 89%, and toluene solvent clearance reaches 96% in the waste gas, accords with emission standard.
Example 5
Step 1): collecting toluene waste gas and sending the toluene waste gas into a wind collecting box 1 for storage;
step 2): conveying the toluene waste gas in the wind collecting box 1 to a 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, wherein the cooling temperature of the waste gas is reduced to 41 ℃;
step 3): pumping the low-temperature dust-free waste gas into an adsorption unit 4 by a high-pressure centrifugal fan 3, wherein the air outlet pressure of the low-temperature dust-free waste gas is 0.12 MPa;
step 4): the waste gas enters an adsorption tank in the adsorption unit 4, a toluene solvent in the waste gas is adsorbed into pores of 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 penetrates through the carbon layer, so that the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank;
step 5): when the adsorption tank adsorbs for a certain time and the adsorption capacity of the activated carbon in the tank reaches more than 95% of the total adsorption capacity, the adsorption tank which finishes desorption is switched to continue adsorption, the vacuum pump 51 is started, the pressure of the vacuum pump 51 is set to be 0.055MPa, the solvent is pumped out from the activated carbon layer of the adsorption tank to be desorbed and then 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 sent into the solvent storage tank 53, the gas continues to enter the second condenser 522, the solvent condensed by the second condenser 522 is subjected to gas-liquid separation, the liquid is directly sent into the solvent storage tank 53, the gas continues to enter the third condenser 523, and the liquid solvent condensed by the third condenser 523 is sent into the solvent storage tank 53 to be recovered and stored.
Through detecting and using the utility model provides a recovery process toluene solvent rate of recovery of toluene waste gas vacuum cryrogenic recovery system is 85.5%, and toluene solvent clearance reaches 96.5% in the waste gas, accords with emission standard.
It should be noted that the above mentioned embodiments and embodiments are intended to demonstrate the practical application of the technical solution provided by the present invention, and should not be interpreted as limiting the scope of the present invention. Various modifications, equivalent substitutions and improvements will occur to those skilled in the art and are intended to be within the spirit and scope of the present invention. The protection scope of the present invention is subject to the appended claims.
Claims (8)
1. The utility model provides a recovery system of toluene waste gas vacuum cryrogenic which characterized in that, recovery system includes: the system comprises an air collecting box (1), a waste gas pretreatment unit (2), a centrifugal fan (3), an adsorption unit (4), a vacuum deep cooling unit (5) and a water cooling tower (6); wherein,
the air collecting box (1), the air collecting box (1) is used for collecting and storing toluene waste gas;
the toluene waste gas enters the waste gas pretreatment unit (2) from the wind collecting box (1) for filtration and cooling;
the toluene waste gas filtered and cooled in the waste gas pretreatment unit (2) is pumped into the adsorption unit (4) through a centrifugal fan (3), the toluene waste gas collected in 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) is used for pumping out the high-concentration solvent waste gas in the adsorption unit (4) by a vacuum pump for deep condensation and recovery;
and the water cooling tower (6), the water cooling tower (6) is respectively connected with the waste gas pretreatment unit (2) and the vacuum cryogenic unit (5) to form a circulating loop for providing cooling water.
2. A recovery system according to claim 1, characterized in that the exhaust gas pre-treatment unit (2) comprises a filter (21) and a cooler (22); wherein, the wind 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 water cooling tower (6) through pipelines and used for cooling and reducing the temperature of the waste gas.
3. A recovery system as set forth in claim 2, characterized in that the filter (21) is provided with a layer of filter cotton for filtering solid particles from the exhaust gas.
4. A 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 carried out simultaneously to ensure continuous operation of the recovery system.
5. A recovery system as claimed in claim 4, characterized in that the adsorption unit (4) is provided with an activated carbon adsorption layer for adsorbing the solvent in the exhaust gas, said activated carbon adsorption layer being provided with a temperature measuring point.
6. The recycling system according to claim 5, wherein the activated carbon is a cylindrical coal-based granular activated carbon, and the diameter of the activated carbon granules is 2-4 mm.
7. A recovery system according to claim 1, characterized in that the vacuum cryogenic unit (5) comprises a vacuum pump (51), a tertiary deep condensation device (52) and a solvent storage tank (53); wherein, the vacuum pump (51) is communicated with the adsorption unit (4) and the third-stage deep condensation device (52) through pipelines, and the third-stage deep condensation device (52) is communicated with the solvent storage tank (53) and the water cooling tower (6) through pipelines.
8. A recovery system as in claim 7, characterized in that the three-stage deep condensation 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721351984.3U CN207413079U (en) | 2017-10-19 | 2017-10-19 | A kind of recovery system of toluene waste gas vacuum deep cooling |
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| CN201721351984.3U CN207413079U (en) | 2017-10-19 | 2017-10-19 | A kind of recovery system of toluene waste gas vacuum deep cooling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107670454A (en) * | 2017-10-19 | 2018-02-09 | 泉州市天龙环境工程有限公司 | A kind of recovery system and its recovery process of toluene waste gas vacuum deep cooling |
| CN111482040A (en) * | 2019-01-29 | 2020-08-04 | 内蒙古环保投资集团有限公司 | Cryogenic micro-negative pressure circulating purification device and VOCs treatment method based on same |
| CN113350957A (en) * | 2021-07-06 | 2021-09-07 | 瑞燃(上海)环境工程技术有限公司 | Device and method for treating organic silicon waste gas |
-
2017
- 2017-10-19 CN CN201721351984.3U patent/CN207413079U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107670454A (en) * | 2017-10-19 | 2018-02-09 | 泉州市天龙环境工程有限公司 | A kind of recovery system and its recovery process of toluene waste gas vacuum deep cooling |
| CN107670454B (en) * | 2017-10-19 | 2023-12-15 | 泉州市天龙环境工程有限公司 | Toluene waste gas vacuum cryogenic recovery system and recovery process thereof |
| CN111482040A (en) * | 2019-01-29 | 2020-08-04 | 内蒙古环保投资集团有限公司 | Cryogenic micro-negative pressure circulating purification device and VOCs treatment method based on same |
| CN113350957A (en) * | 2021-07-06 | 2021-09-07 | 瑞燃(上海)环境工程技术有限公司 | Device and method for treating organic silicon waste gas |
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