CN207413090U - A kind of recovery system of toluene waste gas steam desorption - Google Patents
A kind of recovery system of toluene waste gas steam desorption Download PDFInfo
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- CN207413090U CN207413090U CN201721353409.7U CN201721353409U CN207413090U CN 207413090 U CN207413090 U CN 207413090U CN 201721353409 U CN201721353409 U CN 201721353409U CN 207413090 U CN207413090 U CN 207413090U
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 239000002912 waste gas Substances 0.000 title claims abstract description 67
- 238000011084 recovery Methods 0.000 title claims abstract description 43
- 238000003795 desorption Methods 0.000 title claims abstract description 37
- 238000001179 sorption measurement Methods 0.000 claims abstract description 111
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 110
- 239000002904 solvent Substances 0.000 claims abstract description 86
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 239000003960 organic solvent Substances 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 21
- 238000000926 separation method Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000009833 condensation Methods 0.000 claims abstract description 6
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- 238000011069 regeneration method Methods 0.000 description 6
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- Treating Waste Gases (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The utility model provides a kind of recovery system of toluene waste gas steam desorption, and the recovery system includes exhaust gas pretreatment unit, absorbing unit, desorption cooling unit and condensation separation unit tower；Wherein, solvent off-air is collected into air collecting box, solvent and exhaust gas are formed after the pretreatment of exhaust gas pretreatment unit, and pass through centrifugal blower and pump in absorbing unit, absorbing unit includes the adsorption tank equipped with activated carbon adsorption layer, the adsorption tank is connected with steam generator, for heating the solvent adsorbed it is made to be generated as gaseous solvent；Gaseous solvent is cooled to organic solvent and water vapour and isolates organic solvent by desorption cooling unit.The utility model is adsorbed using micro-positive pressure, the operation process of tiny structure desorption, is built favourable absorption and desorption conditions for activated carbon, so as to improve the treatment effect of retracting device, is reduced operating cost.
Description
Technical Field
The utility model relates to an organic waste gas's recovery system, specifically speaking relates to a recovery system of toluene waste gas steam desorption.
Background
In the production of electrical materials, large amounts of toluene-based organic waste gases, such as toluene or xylene (with traces of paraffins), are produced. Toluene has certain toxicity, steam of toluene has stimulation effect on skin and mucous membrane of human body, and simultaneously has anesthesia effect on central nervous system, long-term effect can affect liver and kidney function, xylene has medium toxicity, steam of toluene has excitation and anesthesia effects besides injuring mucous membrane and respiratory tract of human body, in a word, toluene organic waste gas can not only cause injury to human body, but also pollute environment when discharged into atmosphere. As can be seen from the properties, toluene and xylene are both insoluble in water and soluble in various organic solvents, so the industrial chemical absorption method is usually adopted to purify and absorb toluene and xylene, but when the distillation method is adopted to separate and recover the absorbent, toluene and xylene, a large amount of energy is consumed, the production cost is increased, and the recovery efficiency is not very high.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model aims to provide a recovery system and a recovery process for toluene waste gas steam desorption, which overcome the defects in the prior art.
In order to achieve the above object, the utility model provides a recovery system of toluene waste gas steam desorption, recovery system includes: the device comprises an air collecting box, a waste gas pretreatment unit, a centrifugal fan, an adsorption unit, a desorption cooling unit and a condensation separation unit; the waste gas pretreatment unit comprises a filter and a cooler; collecting solvent waste air into an air collecting box, sequentially pretreating the solvent waste air through a filter and a cooler to form a solvent and waste air, and pumping the solvent and the waste air into an adsorption unit through a centrifugal fan; the adsorption unit comprises an adsorption tank provided with an active carbon adsorption layer and is used for adsorbing a solvent and purifying waste gas; the adsorption tank is connected with the steam generator and is used for heating the adsorbed solvent to generate gaseous solvent; the desorption cooling unit comprises a cooling fan, a vacuum fan, a cooler and a gas-liquid separator; wherein, the vacuum fan sucks the gaseous solvent in the adsorption tank, the gaseous solvent is cooled into an organic solvent and water vapor by a cooler, and the organic solvent is separated by a gas-liquid separator; the cooling fan blows and cools the adsorption tank and the activated carbon adsorption layer; the condensation separation unit comprises a condenser, a buffer separator, a specific gravity separation tank and a solvent storage tank; wherein, the organic solvent and the water vapor in the cooler and the organic solvent in the gas-liquid separator enter a condenser to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank through a buffer separator to be automatically separated, and the separated solvent liquid enters a solvent storage tank; the water cooling tower is connected with the waste gas pretreatment unit, the cooler and the condenser and forms a circulating loop to provide cooling water.
As right the recovery system further explain, preferably, the adsorption unit sets up three adsorption tanks at least to carry out adsorption process and desorption process in turn and guarantee recovery system continuous operation simultaneously.
As a further explanation of the recycling system of the present invention, preferably, the top of the adsorption tank is provided with a liquid level sensor, and when the solvent is adsorbed to the top of the adsorption tank, the steam generator automatically introduces low pressure steam into the adsorption tank.
As right recovery system further explain, preferably, the active carbon adsorption layer is equipped with temperature measurement point and alarm device, when the active carbon reached alarm temperature in adsorption process, alarm device automatic alarm and switching got into desorption process to ensure recovery system operation safety.
As a further explanation of the recycling system of the present invention, preferably, the activated carbon adsorption layer is made of coal-based granular activated carbon, and the diameter of the activated carbon granules is 2-4 mm.
As right recovery system further explain, preferably, centrifugal fan installs centrifugal fan motor converter additional to the realization carries out the frequency modulation variable speed according to different exhaust emissions.
As a further description of the recycling system of the present invention, it is preferable that a filter cotton layer is disposed in the filter for filtering and removing solid particles in the exhaust gas.
In order to realize the utility model discloses a further purpose, the utility model discloses still provide an application toluene waste gas steam desorption's recovery system's recovery process, recovery process includes following step:
step 1): collecting solvent waste air discharged from the production line and sending the collected air into an air collecting box for treatment;
step 2): waste gas in the air collecting box enters a waste gas pretreatment unit, is pretreated by a filter and a cooler in sequence to form a solvent and waste gas, and is pumped into an adsorption unit by a centrifugal fan;
step 3): the solvent and the waste gas entering the adsorption unit pass through the activated carbon adsorption layer, the solvent is adsorbed in the pores by the activated carbon, the waste gas penetrates through the carbon layer, and finally the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank;
step 4): when the solvent adsorbed in the pores by the activated carbon reaches the top of the adsorption tank, the steam generator automatically introduces low-pressure steam into the adsorption tank, and heats the adsorbed solvent to generate a gaseous solvent;
step 5): starting a vacuum fan to suck the gaseous solvent in the adsorption tank to regenerate the activated carbon, starting a cooling fan to sweep the adsorption tank and the activated carbon adsorption layer after regeneration is finished, and switching the adsorption tank to an adsorption state after the temperature is reduced to normal temperature;
step 6): after organic solvent and water vapor desorbed from the surface of the active carbon enter a condenser and are condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank for automatic separation, the separated solvent liquid enters a solvent storage tank, and the wastewater is directly discharged to a wastewater treatment plant.
As a further explanation of the recycling process of the present invention, preferably, the exhaust gas in step 2) is cooled to 40-45 ℃; the air pressure at the outlet of the centrifugal fan is 0.11-0.15 MPa.
The utility model provides a recovery system and application of toluene waste gas steam desorption the recovery technology of system adopts the pressure-fired absorption, and the operation technology of pressure-fired desorption builds favourable absorption and desorption condition for the active carbon to improve recovery unit's treatment effect, adopt the vacuum to assist the desorption, steam consumption is few, reduces the running cost, and the toluene solvent clearance can reach more than 95% in to the waste gas.
Drawings
Figure 1 is the utility model discloses toluene waste gas steam desorption's recovery system schematic diagram.
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 recovery system for toluene waste gas steam desorption of the present invention, the recovery system comprises: the device comprises an air collecting box 1, a waste gas pretreatment unit 2, a centrifugal fan 3, an adsorption unit 4, a desorption cooling unit 5 and a condensation separation unit 6; the air collecting box 1 is communicated with the waste gas pretreatment unit 2 through a pipeline, and the waste gas pretreatment unit 2 comprises a filter and a cooler; collecting solvent waste air into an air collecting box 1, sequentially performing pretreatment through a filter and a cooler to form a solvent and waste gas, reducing the temperature of the waste gas discharged from the cooler to 40-45 ℃, and pumping the waste gas into an adsorption unit 4 through a high-pressure centrifugal fan 3; preferably, centrifugal fan 3 installs centrifugal fan motor converter additional to realize carrying out frequency modulation variable speed according to different exhaust emissions. And a filter cotton layer is arranged in the filter and used for filtering and removing solid particles in the waste gas.
The adsorption unit 4 comprises an adsorption tank provided with an activated carbon adsorption layer and is used for adsorbing a solvent and purifying waste gas; when the solvent waste gas passes through the activated carbon layer, the solvent waste gas is adsorbed in the pores by the activated carbon, air penetrates through the activated carbon layer, and the tail gas meeting the emission requirement is discharged to the atmosphere from a discharge port at the top of the adsorption tank; the adsorption tank is connected with a steam generator 41 and used for heating the adsorbed solvent to generate gaseous solvent; preferably, the adsorption unit 4 is provided with at least three adsorption tanks to alternately perform an adsorption process and a desorption process while ensuring continuous operation of the recovery system. The top of the adsorption tank is provided with a liquid level sensor, and when the solvent is adsorbed to the top of the adsorption tank, the steam generator 41 automatically introduces low-pressure steam into the adsorption tank. The active carbon adsorption layer is provided with a temperature measuring point and an alarm device, and when the active carbon reaches the alarm temperature in the adsorption process, the alarm device automatically alarms and switches to enter the desorption process so as to ensure the operation safety of the recovery system.
Preferably, the activated carbon adsorption layer is made of coal-based granular activated carbon, and the diameter of the activated carbon granules is 2-4 mm. The coal-based granular activated carbon is very suitable for repeated adsorption and desorption occasions of the solvent volatile gas, has very good desorption performance, can resist the temperature naturally up to 450 ℃, can effectively ensure the regeneration effect of a system, greatly reduces the frequency of hot spots, and has the best safety of industrial application.
The desorption cooling unit 5 includes a cooling fan 51, a vacuum fan 52, a cooler 53, and a gas-liquid separator 54; wherein, the vacuum fan 52 sucks the gaseous solvent in the adsorption tank, the gaseous solvent is cooled into the organic solvent and the water vapor by the cooler 53, and the organic solvent is separated by the gas-liquid separator 54; the cooling fan 51 blows and cools the adsorption tank and the activated carbon adsorption layer; the adsorption tank adsorbs a certain period of time, when the top of the adsorption tank is about to penetrate through, the system automatically introduces low-pressure steam to heat the gas solvent, then the vacuum fan is started to suck, so that the activated carbon is regenerated, the cooling fan is started to purge and cool the adsorption tank and the activated carbon after the activated carbon regeneration (desorption) is finished, and the adsorption tank and the activated carbon are switched to an adsorption state after the temperature is reduced to the normal temperature
The condensation-separation unit 6 includes a condenser 61, a buffer separator 62, a specific gravity separation tank 63, and a solvent storage tank 64; wherein, the organic solvent and the water vapor in the cooler 53 and the organic solvent in the vapor-liquid separator 54 enter the condenser 61 to be condensed into a mixed liquid, the mixed liquid enters the specific gravity separation tank 63 through the buffer separator 62 to be automatically separated, and the separated solvent liquid enters the solvent storage tank 64. After organic solvent and water vapor desorbed from the surface of the active carbon enter a condenser and are condensed into liquid, the mixed liquid enters a specific gravity separation tank for automatic separation, the separated solvent liquid enters a storage tank, and the wastewater is directly discharged to a wastewater treatment plant.
The water cooling tower 7 is connected with the waste gas pretreatment unit 2, the cooler 53 and the condenser 61 to form a circulation loop so as to continuously provide cooling water, ensure that the temperature of the waste gas discharged from the cooler can be reduced to 40-45 ℃, ensure that the gaseous solvent is cooled into the organic solvent and the water vapor through the cooler 53, and ensure that the organic solvent and the water vapor in the cooler 53 and the organic solvent in the gas-liquid separator 54 enter the condenser 61 to be condensed into a mixed liquid.
The utility model also provides an application toluene waste gas steam desorption's recovery system's recovery process:
example 1
Step 1): solvent waste air discharged from the production line is collected and sent into a wind collecting box 1 to be treated.
Step 2): waste gas in the air collecting box 1 enters a waste gas pretreatment unit 2, and is pretreated by a filter and a cooler in sequence to form a solvent and waste gas so as to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas, and the waste gas is cooled to 40 ℃; and pumped into the adsorption unit 4 by the centrifugal fan 3, wherein the air pressure at the outlet of the centrifugal fan 3 is 0.11 Mpa.
Step 3): the solvent and the waste gas entering the adsorption unit 4 pass through an activated carbon adsorption layer consisting of columnar coal-based granular activated carbon with the diameter of 2mm, the solvent is adsorbed in the pores by the activated carbon, the waste gas penetrates through the carbon layer, and finally the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank.
Step 4): when the solvent adsorbed in the pores by the activated carbon reaches the top of the adsorption tank, i.e., when the total adsorption amount is more than 95%, the steam generator 41 automatically introduces low-pressure steam into the adsorption tank, and heats the adsorbed solvent to generate a gaseous solvent.
Step 5): the vacuum fan 52 is started to suck the gaseous solvent in the adsorption tank to regenerate the activated carbon, the cooling fan 51 is started to purge the adsorption tank and the activated carbon adsorption layer after regeneration is finished, and the adsorption tank is switched to an adsorption state after the temperature is reduced to normal temperature.
Step 6): organic solvent and water vapor desorbed from the surface of the activated carbon enter a condenser 61 to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank 63 to be automatically separated, the separated solvent liquid enters a solvent storage tank 64, and the wastewater is directly discharged to a wastewater treatment plant.
Through detecting and using the utility model provides a recovery process toluene solvent recovery rate of toluene waste gas steam desorption recovery system is 85%, and toluene solvent clearance reaches 95% in the waste gas, accords with emission standard.
Example 2
Step 1): solvent waste air discharged from the production line is collected and sent into a wind collecting box 1 to be treated.
Step 2): waste gas in the air collecting box 1 enters a waste gas pretreatment unit 2, and is pretreated by a filter and a cooler in sequence to form a solvent and waste gas so as to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas, and the waste gas is cooled to 45 ℃; and pumped into the adsorption unit 4 by the centrifugal fan 3, wherein the air pressure at the outlet of the centrifugal fan 3 is 0.15 Mpa.
Step 3): the solvent and the waste gas entering the adsorption unit 4 pass through an activated carbon adsorption layer consisting of cylindrical coal-based granular activated carbon with the diameter of 4mm, the solvent is adsorbed in the pores by the activated carbon, the waste gas penetrates through the carbon layer, and finally the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank.
Step 4): when the solvent adsorbed in the pores by the activated carbon reaches the top of the adsorption tank, i.e., when the total adsorption amount is more than 95%, the steam generator 41 automatically introduces low-pressure steam into the adsorption tank, and heats the adsorbed solvent to generate a gaseous solvent.
Step 5): the vacuum fan 52 is started to suck the gaseous solvent in the adsorption tank to regenerate the activated carbon, the cooling fan 51 is started to purge the adsorption tank and the activated carbon adsorption layer after regeneration is finished, and the adsorption tank is switched to an adsorption state after the temperature is reduced to normal temperature.
Step 6): organic solvent and water vapor desorbed from the surface of the activated carbon enter a condenser 61 to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank 63 to be automatically separated, the separated solvent liquid enters a solvent storage tank 64, and the wastewater is directly discharged to a wastewater treatment plant.
Through detecting and using the utility model provides a recovery process toluene solvent recovery rate of toluene waste gas steam desorption recovery system is 90%, and toluene solvent clearance reaches 97% in the waste gas, accords with emission standard.
Example 3
Step 1): solvent waste air discharged from the production line is collected and sent into a wind collecting box 1 to be treated.
Step 2): waste gas in the air collecting box 1 enters a waste gas pretreatment unit 2, and is pretreated by a filter and a cooler in sequence to form a solvent and waste gas so as to filter solid particles in the waste gas and cool the gas to form low-temperature dust-free waste gas, wherein the waste gas is cooled to 43 ℃; and pumped into the adsorption unit 4 by the centrifugal fan 3, wherein the air pressure at the outlet of the centrifugal fan 3 is 0.13 Mpa.
Step 3): the solvent and the waste gas entering the adsorption unit 4 pass through an activated carbon adsorption layer consisting of cylindrical coal-based granular activated carbon with the diameter of 3mm, the solvent is adsorbed in the pores by the activated carbon, the waste gas penetrates through the carbon layer, and finally the gas reaching the emission standard is discharged into the atmosphere from a discharge port at the top of the adsorption tank.
Step 4): when the solvent adsorbed in the pores by the activated carbon reaches the top of the adsorption tank, i.e., when the total adsorption amount is more than 95%, the steam generator 41 automatically introduces low-pressure steam into the adsorption tank, and heats the adsorbed solvent to generate a gaseous solvent.
Step 5): the vacuum fan 52 is started to suck the gaseous solvent in the adsorption tank to regenerate the activated carbon, the cooling fan 51 is started to purge the adsorption tank and the activated carbon adsorption layer after regeneration is finished, and the adsorption tank is switched to an adsorption state after the temperature is reduced to normal temperature.
Step 6): organic solvent and water vapor desorbed from the surface of the activated carbon enter a condenser 61 to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank 63 to be automatically separated, the separated solvent liquid enters a solvent storage tank 64, and the wastewater is directly discharged to a wastewater treatment plant.
Detect and use the utility model provides a recovery process toluene solvent recovery rate of toluene waste gas steam desorption recovery system is 87%, 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 (7)
1. A recovery system for toluene exhaust gas steam desorption, characterized in that the recovery system comprises: the device comprises an air collecting box (1), a waste gas pretreatment unit (2), a centrifugal fan (3), an adsorption unit (4), a desorption cooling unit (5), a condensation separation unit (6) and a water cooling tower (7); wherein,
the air collecting box (1) is communicated with the waste gas pretreatment unit (2) through a pipeline, and the waste gas pretreatment unit (2) comprises a filter and a cooler; solvent waste air is collected into an air collecting box (1), is pretreated by a filter and a cooler in sequence to form a solvent and waste air, and is pumped into an adsorption unit (4) through a centrifugal fan (3);
the adsorption unit (4) comprises an adsorption tank provided with an activated carbon adsorption layer and is used for adsorbing a solvent and purifying waste gas; the adsorption tank is connected with a steam generator (41) and is used for heating the adsorbed solvent to generate gaseous solvent;
the desorption cooling unit (5) comprises a cooling fan (51), a vacuum fan (52), a cooler (53) and a gas-liquid separator (54); wherein, a vacuum fan (52) sucks the gaseous solvent in the adsorption tank, the gaseous solvent is cooled into an organic solvent and water vapor by a cooler (53), and the organic solvent is separated by a gas-liquid separator (54); a cooling fan (51) blows and cools the adsorption tank and the activated carbon adsorption layer;
the condensation separation unit (6) comprises a condenser (61), a buffer separator (62), a specific gravity separation tank (63) and a solvent storage tank (64); wherein, the organic solvent and the water vapor in the cooler (53) and the organic solvent in the gas-liquid separator (54) enter a condenser (61) to be condensed into mixed liquid, the mixed liquid enters a specific gravity separation tank (63) through a buffer separator (62) to be automatically separated, and the separated solvent liquid enters a solvent storage tank (64);
a water cooling tower (7) is connected to the exhaust gas pretreatment unit (2), the cooler (53) and the condenser (61) and forms a circulation loop to provide cooling water.
2. A recovery system according to claim 1, characterized in that the adsorption unit (4) is provided with at least three adsorption tanks to alternately perform the adsorption process and the desorption process while ensuring continuous operation of the recovery system.
3. The recycling system according to claim 1 or 2, wherein the top of the adsorption tank is provided with a liquid level sensor, and the steam generator (41) automatically feeds low-pressure steam into the adsorption tank when the solvent is adsorbed to the top of the adsorption tank.
4. The recycling system of claim 1, wherein the activated carbon adsorption layer is provided with a temperature measuring point and an alarm device, and when the activated carbon reaches the alarm temperature in the adsorption process, the alarm device automatically alarms and switches to the desorption process so as to ensure the safe operation of the recycling system.
5. The recycling system according to claim 1, wherein the activated carbon adsorption layer is made of coal-based granular activated carbon, and the diameter of the activated carbon granules is 2-4 mm.
6. A recovery system according to claim 1, characterized in that the centrifugal fan (3) is additionally provided with a centrifugal fan motor frequency converter to realize frequency-modulated speed change according to different exhaust emissions.
7. The recycling system according to claim 1, wherein the filter is provided with a filter cotton layer for filtering and removing solid particles in the exhaust gas.
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| CN201721353409.7U CN207413090U (en) | 2017-10-19 | 2017-10-19 | A kind of recovery system of toluene waste gas steam desorption |
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| CN201721353409.7U CN207413090U (en) | 2017-10-19 | 2017-10-19 | A kind of recovery system of toluene waste gas steam desorption |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107715648A (en) * | 2017-10-19 | 2018-02-23 | 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 steam desorption |
| CN113680171A (en) * | 2021-08-27 | 2021-11-23 | 惠州市万绿启佳环保科技有限公司 | Organic waste gas purification process |
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2017
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107715648A (en) * | 2017-10-19 | 2018-02-23 | 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 steam desorption |
| CN113680171A (en) * | 2021-08-27 | 2021-11-23 | 惠州市万绿启佳环保科技有限公司 | Organic waste gas purification process |
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