CN216418832U - Device for adsorbing, desorbing, grading, condensing, removing and recycling VOCs (volatile organic compounds) - Google Patents

Device for adsorbing, desorbing, grading, condensing, removing and recycling VOCs (volatile organic compounds) Download PDF

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Publication number
CN216418832U
CN216418832U CN202122948579.2U CN202122948579U CN216418832U CN 216418832 U CN216418832 U CN 216418832U CN 202122948579 U CN202122948579 U CN 202122948579U CN 216418832 U CN216418832 U CN 216418832U
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desorption
vocs
adsorption
gas
oil
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赵伟荣
马莹莹
姚露露
皇甫晨阳
郭珊珊
吴淑澄
王镇涛
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Jiangsu Anqier Waste Gas Purification Co ltd
Zhejiang University ZJU
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Jiangsu Anqier Waste Gas Purification Co ltd
Zhejiang University ZJU
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The utility model discloses a device for desorption-fractional condensation, desorption and recovery of VOCs, which comprises a first heat exchanger, an adsorption tank system, a mixing tank, a surface cooler and a condenser system which are connected in sequence; a gas outlet of the condenser system is connected with the mixing tank, a liquid outlet of the condenser system is connected with the oil-water separator, an oil outlet of the oil-water separator is connected with the oil storage device, and a gas volatilization port of the oil storage device is connected with the adsorption tank system; the gas outlet of the mixing box is also connected with the first heat exchanger. The utility model discloses can realize having high VOCs desorption efficiency and recovery efficiency's process flow to remedy the not enough of current device and technology, realize that the emission tail gas degree of depth is up to standard. In addition, this system still has the desorption security height, lets out the advantage that the leakage rate is low, desorption gas recycles, heat recovery efficiency is high.

Description

Device for adsorbing, desorbing, grading, condensing, desorbing and recovering VOCs (volatile organic compounds)
Technical Field
The utility model relates to an environmental protection technology field, concretely relates to adsorb desorption-fractional condensation desorption retrieve VOCs's device.
Background
Volatile Organic Compounds (VOCs) are the focus of the exhaust gas treatment industry. The current mainstream VOCs treatment technology mainly comprises adsorption concentration-regenerative combustion, and the method has high removal rate but CO2The emission is large, contradicts the concept of 'energy conservation and carbon reduction', and the economical efficiency of the carbon tax is uncertain after the 'carbon tax' is superimposed.
The carbon emission reduction demand of the current VOCs treatment industry is increased sharply, and the industry is promoted to be transformed and upgraded from VOCs combustion to VOCs recovery. In addition, VOCs produced in production links of various industries (such as petrochemical industry, printing, coating and the like) have the characteristics of large discharge amount, medium and low concentration and recoverability, but the corresponding recovery process is not complete. Under the background, it is significant to develop a high-efficiency removal and recovery device for medium-low concentration VOCs.
Condensation recovery is a potential technical route and is widely applied in the recovery process of VOCs. In summary, the condensation recovery technology of VOCs mainly includes two types: direct condensation recovery and medium adsorption-condensation recovery process.
In the field, patent CN 208194041U discloses a system for removing VOCs by condensation, which directly condenses the waste gas of non-concentrated VOCs, and has large air volume for treatment and limited effect of removing and recovering VOCs; the patent CN 111036040U is improved on the basis, a two-stage condensation device is adopted, an adsorption device is added behind the condensation device, the waste gas treatment effect is improved, but the air quantity of a condensation and adsorption system is large, the system cost is high, and the adaptability to medium-concentration and low-concentration waste gas is poor; patent CN 208865392U provides an adsorb concentrated hot nitrogen gas desorption condensation recovery unit, and the device adopts the adsorption tanks parallelly connected and single-stage condensation mode to retrieve VOCs waste gas, and VOCs desorption, recovery efficiency are limited.
Comprehensively, the present VOCs condensation recovery technology is respectively not enough in the aspect of VOCs desorption efficiency, VOCs condensation recovery efficiency, system cost and middle and low concentration waste gas adaptability, has not yet developed high-efficient, economic processing apparatus.
To the aforesaid not enough, the utility model designs a circulation processing apparatus through multistage active carbon series connection absorption and multistage condensation, can make VOCs desorption efficiency reach more than 99.5%, guarantees high recovery efficiency and low VOCs emission concentration. The process is suitable for small air volume (30000 m)3Less than h), medium and low concentration (10-1000 mg/m)3) An exhaust gas treatment scenario.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device of VOCs is retrieved in desorption-fractional condensation desorption, can carry out the process flow who has high VOCs desorption efficiency and recovery efficiency to remedy the not enough of current device and technology, be applicable to the high industrial enterprise who just has the demand of retrieving VOCs of VOCs emission standard, equip the support for it provides, promote green industry revolution.
A device for absorbing, desorbing, condensing, removing and recovering VOCs in stages comprises a first heat exchanger, an absorption box system, a mixing box, a surface cooler and a condenser system which are connected in sequence;
a gas outlet of the condenser system is connected with the mixing tank, a liquid outlet of the condenser system is connected with the oil-water separator, an oil outlet of the oil-water separator is connected with the oil storage device, and a gas volatilization port of the oil storage device is connected with the adsorption tank system;
the gas outlet of the mixing box is also connected with the first heat exchanger.
When the device for recovering VOCs by adsorption, desorption and fractional condensation is used, VOCs are adsorbed and intercepted after waste gas passes through the adsorption box system, and treated gas is discharged. The desorption air is heated by the first heat exchanger and then passes through the adsorption tank system, the adsorbed VOCs are desorbed and then enter the mixing tank, the desorbed air is uniformly mixed with clean desorption air separated by the condenser system in the mixing tank (including uniform temperature, uniform material distribution and the like) and then selectively returns to the first heat exchanger for cyclic utilization and/or sequentially enters the surface cooler and the condenser system for gas-liquid separation according to needs or actual conditions, liquid separated by the condenser system enters the oil-water separator, an oil phase separated in the oil-water separator enters the oil storage device and can be reused in the production process and the like, a water phase obtained by separation can be discharged or used for other purposes, and the oil phase in the oil storage device can continuously volatilize the VOCs.
The adsorbent in the adsorption tank system may be activated carbon, zeolite, or the like.
In a preferred embodiment, the adsorption, desorption, fractional condensation, desorption and recovery device for VOCs comprises a multi-stage adsorption tank system, wherein the multi-stage adsorption tank system is arranged in parallel on a desorption air pipeline and is arranged in series on a waste gas purification pipeline. The multistage adsorption tanks can change the working state (adsorption or desorption), the adsorption sequence and the like of each adsorption tank through pipeline design and valve switching.
After being cooled to 10-40 ℃ by a surface cooler, the high-temperature desorption gas enters a condenser system and is gradually cooled to-70 to-30 ℃.
In a preferred embodiment, the adsorption, desorption, fractional condensation, desorption and recovery device for VOCs comprises a multistage series-connected condenser, specifically 2-4 stages.
The device for desorbing, condensing, removing and recovering VOCs in stages by adsorption and desorption is characterized in that the condenser system is connected with the refrigerating unit to form a condensate circulating system;
a gas outlet of the condenser system is connected with the mixing box through a second heat exchanger;
the refrigerating unit comprises a compressor and a shell;
and a cavity between the compressor and the shell is connected with the second heat exchanger and the circulating fan to form a gas medium circulating system.
The gas circulating in the gas medium circulating system can be air and the like, the clean desorption air separated from the condenser system is preheated by the heat generated by the compressor in the second heat exchanger, and the preheated clean desorption air enters the mixing box again.
The condenser system can adopt ethanol water solution as a condensing medium, and the safety and environmental protection performance of the system are obviously improved.
In a preferred embodiment, the device for removing and recovering the VOCs by adsorption, desorption and fractional condensation is characterized in that the surface cooler is connected with a circulating cooling water system to form a cooling water circulating system. Specifically, cooling water can enter the surface cooler from the water cooling tower under the action of the water pump, and enters the water cooling tower again after exchanging heat with high-temperature desorption gas in the surface cooler, so that the cooling water is recycled.
In a preferred embodiment, the adsorption, desorption, fractional condensation, desorption and recovery device for the VOCs, and the gas volatilization port of the oil storage device is connected with the adsorption tank system through a prefilter. The particulate matter in the waste gas can be got rid of to the prefilter to prevent that the direct absorption case that gets into of particulate matter from causing the jam, reduce adsorption efficiency, and avoid the dust to lead to the fact wearing and tearing to inside such as fan, heat exchanger. The exhaust gas can also enter the adsorption tank system after passing through the prefilter.
The device for desorbing and condensing in stages to remove and recover VOCs comprises a prefilter, a bag-type dust collector, an electrostatic dust collector, a cyclone dust collector and the like.
Compared with the prior art, the utility model, main advantage includes:
1) the adsorption effect is good, and the discharged tail gas reaches the standard deeply. A multi-stage adsorption system is designed, and the VOCs treatment efficiency reaches more than 99.5%;
2) the organic matter recovery rate is high. A multi-stage low-temperature condensation system is designed, and the recovery rate of organic matters is more than 99 percent;
3) the system cost is relatively low. The system adopts an adsorption-hot air desorption mode to concentrate the waste gas, so that the air quantity of a condensation system can be obviously reduced, and the overall cost and the operation cost of the system are reduced.
4) And designing a cyclic adsorption and desorption process. The system adopts a cyclic adsorption and cyclic desorption mode, so that the adsorption and desorption process is more thorough;
5) the high-temperature desorption air is recycled. The condensed tail gas is recycled, so that the consumption of desorption air (such as nitrogen and the like) is reduced;
6) the high-temperature desorption system can be provided with multiple protections and has high safety. The system can be provided with multiple protection devices such as water spraying, nitrogen fire extinguishing and the like, so that the smoldering phenomenon is avoided, and the safe desorption is ensured.
7) The heat recovery efficiency is high. The system makes full use of the heat of the refrigeration compressor and recycles the heat for preheating the condensed tail gas.
Drawings
Fig. 1 is a schematic structural diagram of the apparatus for recovering VOCs by adsorption, desorption, fractional condensation, desorption, according to this embodiment, in which: the dotted line represents a desorption air line, the short dashed line represents a waste gas/volatile gas line, the solid line represents a liquid/high temperature heat source line, and the thick dashed line represents a gas medium line.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.
As shown in fig. 1, the device for desorbing, desorbing and recovering VOCs by adsorption and fractional condensation of the present embodiment includes a first heat exchanger 1, an adsorption tank system, a mixing tank 6, a surface air cooler 7, and a condenser system, which are connected in sequence.
The gas outlet of the condenser system is connected to the mixing tank 6 via a second heat exchanger 11. The liquid outlet of the condenser system is connected with the oil-water separator 12, the oil outlet of the oil-water separator 12 is connected with the oil storage device 15, and the gas volatilization port of the oil storage device 15 is connected with the adsorption tank system.
The gas outlet of the mixing box 6 is also connected to the first heat exchanger 1. The medium of the first heat exchanger 1 is a high temperature heat source 18.
The adsorption tank system comprises 3 stages of adsorption tanks 3, 4 and 5, wherein the multistage adsorption tanks are arranged on the desorption air pipeline in parallel and are arranged on the waste gas purification pipeline in series. The adsorbent in the adsorption tank system is active carbon or zeolite.
The condenser system comprises 3 series connected condensers 8, 9, 10.
The condenser system is connected to a refrigeration unit 14 to form a condensate circulation system. The condenser system may employ aqueous ethanol as the condensing medium.
The refrigeration unit 14 includes a compressor and a housing;
and a cavity between the compressor and the shell is connected with the second heat exchanger 11 and the circulating fan 16 to form a gas medium circulating system.
The surface cooler 7 is connected with a circulating cooling water system 13 to form a cooling water circulating system.
The gas volatilization port of the oil storage device 15 is connected with the adsorption tank system through the prefilter 2. The pre-filter 2 may be a bag-type dust collector, an electrostatic precipitator, or the like.
When the device of the absorption desorption-fractional condensation desorption recovery VOCs of this embodiment used, waste gas 17 was in proper order behind prefilter 2, adsorption tank system, and VOCs is held back by the absorption, and the gaseous emission 20 after the processing. The desorption air 19 is heated by the first heat exchanger 1, passes through the adsorption tank system, desorbs the adsorbed VOCs and then enters the mixing tank 6, the clean desorption air which is separated from the condenser system in the mixing box 6 and preheated by the second heat exchanger 11 is uniformly mixed (comprising uniform temperature, uniform material distribution and the like), then selectively returns to the first heat exchanger 1 for cyclic utilization according to the requirement or actual conditions and/or sequentially enters the surface cooler 7 and the condenser system for gas-liquid separation, the liquid separated by the condenser system enters the oil-water separator 12, the oil phase separated in the oil-water separator 12 enters the oil storage device 15 and can be reused in the production process, etc., the separated water phase can be discharged or used for other purposes, the oil phase in the oil storage device 15 can continuously volatilize VOCs, thus, the gas volatilization port of the oil reservoir 15 is connected back through the pre-filter 2 to the adsorption tank system to treat the VOCs volatilized from the oil reservoir 15.
The gas circulating in the gas medium circulating system can be air, the clean desorption air separated from the condenser system is preheated by the heat generated by the compressor in the second heat exchanger 11, and the preheated clean desorption air enters the mixing box 6.
The utility model discloses a device that VOCs was retrieved in absorption desorption-fractional condensation desorption has that the absorption desorption is thorough, the leakage rate is low, desorption gas recycles, advantages such as heat recovery efficiency height.
Application example 1
By using the device for adsorbing, desorbing, removing and recovering VOCs by fractional condensation of the embodiment, the waste gas is mostly from the spraying process of the surface coating industry, and the small part of the waste gas is from a storage tank filled with the recovered solvent. The main component of the waste gas is halogenated hydrocarbon containing fluorine. The total air volume of the system is 3000m3H, concentration of VOCs about 400mg/m3. This system adopts multistage circulation adsorption mode to improve VOCs desorption efficiency, in addition, adopts high temperature nitrogen gas circulation desorption in the desorption link, and condensing system adopts fractional condensation to improve the VOCs rate of recovery.
The desorption time of the activated carbon adsorption box is about 5 hours, the desorption temperature is set as 100 ℃, and the desorption air volume is 500m3/h。
The design air volume of the condenser system is 600m3H is used as the reference value. The desorption waste gas is cooled to 20-30 ℃ through cooling water in advance before entering a condensation system, and then enters a multi-stage condensation system to be gradually cooled to about-50 ℃. The purified low-temperature gas is preheated by the heat generated by the compressor and then recycled to the active carbon desorption system. The condensate enters an oil-water separator. After the desorption waste gas is condensed, the amount of condensed organic matters is about 65.8t/a, and the amount of the condensed water is about 12.9 t/a.
Practical operation detection shows that the removal efficiency of VOCs in the application example can reach 99.7%, and the recovery efficiency of VOCs in the condensation system can reach 99.2%.
Application example 2
By using the device for adsorbing, desorbing, removing and recovering VOCs by fractional condensation of the embodiment, the waste gas is from the storage tank waste gas in the petrochemical industry, and the total air volume is 12000m3H, concentration of VOCs about 900mg/m3. The main components of the waste gas are alkane and olefin organic matters. Because the recovery value of VOCs in the waste gas is higher, a high-performance activated carbon adsorption material is selected for fully recovering the VOCs.
The desorption time of the activated carbon adsorption box is about 5 hours, the desorption temperature is set as 100 ℃, and the desorption air volume is 1200m3/h。
The design air volume of the condenser system is 1400m3H is used as the reference value. The desorption waste gas is cooled to about 20 ℃ in advance by cooling water before entering a condensation system, and then enters a multi-stage condensation system to be gradually cooled to-40 ℃. The purified low-temperature gas is preheated by utilizing the heat generated by the compressor and then recycled to the active carbon desorption system. The condensate enters an oil-water separator.
Practical operation tests show that the removal efficiency of VOCs in the application example can reach 99.6%, the recovery efficiency of VOCs in a condensation system can reach 99.4%, and the heat recovery efficiency of the system can reach 70%.
Application example 3
By using the apparatus for recovering VOCs by adsorption, desorption, fractional condensation, desorption and desorption of the examples, the exhaust gas mainly comes from volatile organic exhaust gas generated in the printing process, and the main components are toluene, ethyl acetate and the like. The total air volume of the system is 30000m3H, concentration 55mg/m3. Because the waste gas is discharged in an unorganized way and the concentration is lower, the VOCs removing efficiency is improved by adopting a multi-stage circulating adsorption mode.
The desorption time of the zeolite adsorption box is about 3 hours, the desorption temperature is set to be 200 ℃, and the desorption air volume is 3000m3/h。
The design air volume of the condenser system is 4000m3H is used as the reference value. The desorption waste gas is cooled to room temperature by cooling water in advance before entering a condensation system, and then enters a multi-stage condensation system to be gradually cooled to-60 ℃. The purified low-temperature gas is preheated by using the heat generated by the compressorAnd then recycled to an activated carbon desorption system.
Practical operation tests show that the removal efficiency of VOCs in the application example reaches 99.5%, the recovery efficiency of VOCs in a condensation system reaches 99.1%, and the heat recovery efficiency of the system reaches 80%.
Application example 4
By using the device for adsorbing, desorbing, removing and recovering VOCs by fractional condensation of the embodiment, the waste gas is mainly from volatile organic waste gas generated in the electrostatic spraying process, and the main components of the waste gas are toluene, xylene and the like. The total air volume of the system is 7000m3H, concentration 235mg/m3. The temperature of the waste gas is 150-200 ℃. Considering that the temperature of the waste gas is higher, the waste gas collecting pipeline is insulated for effectively recovering waste heat. Before the waste gas reaches a waste gas treatment point, heat is recovered through a two-stage heat exchanger and is used for heating cold water to 50-60 ℃, and the amount of generated hot water is about 7 t/h; after two-stage heat exchange, the temperature of the waste gas is reduced to below 50 ℃.
The multistage circulating adsorption system adopts zeolite as an adsorption medium. The desorption time of the adsorption box is about 3 hours, the desorption temperature is set to be 200 ℃, and the desorption air volume is 700m3/h。
The design air volume of the condenser system is 1000m3H is used as the reference value. The desorption waste gas is cooled to room temperature by cooling water in advance before entering a condensation system, and then enters a multi-stage condensation system to be gradually cooled to-70 ℃. The purified low-temperature desorption gas is preheated by heat generated by a compressor and then recycled to the active carbon desorption system.
Actual operation detection shows that the removal efficiency of VOCs in the application example reaches 99.8%, and the recovery efficiency of VOCs in the condensation system reaches 99.3%.
Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the above description of the present invention, and such equivalents also fall within the scope of the appended claims.

Claims (7)

1. The device for removing and recovering VOCs (volatile organic compounds) by adsorption, desorption and fractional condensation is characterized by comprising a first heat exchanger (1), an adsorption tank system, a mixing tank (6), a surface cooler (7) and a condenser system which are sequentially connected;
a gas outlet of the condenser system is connected with the mixing tank (6), a liquid outlet of the condenser system is connected with the oil-water separator (12), an oil outlet of the oil-water separator (12) is connected with the oil storage device (15), and a gas volatilization port of the oil storage device (15) is connected with the adsorption tank system;
the gas outlet of the mixing box (6) is also connected with the first heat exchanger (1).
2. The apparatus of claim 1, wherein the adsorption tank system comprises a plurality of adsorption tanks, and the adsorption tanks are connected in parallel to the desorption air pipeline and connected in series to the exhaust gas purification pipeline.
3. The apparatus according to claim 1, wherein the condenser system comprises a plurality of series-connected condensers.
4. The apparatus for adsorptive desorption-fractional condensation desorption recovery of VOCs according to claim 1 wherein the condenser system is connected to a refrigeration unit (14) to form a condensate circulation system;
a gas outlet of the condenser system is connected with the mixing box (6) through a second heat exchanger (11);
the refrigeration unit (14) comprises a compressor and a housing;
and a cavity between the compressor and the shell is connected with a second heat exchanger (11) and a circulating fan (16) to form a gas medium circulating system.
5. The apparatus for removing and recovering VOCs by adsorptive desorption-fractional condensation according to claim 1, wherein the surface cooler (7) is connected to a circulating cooling water system (13) to form a cooling water circulating system.
6. The device for removing and recovering VOCs by adsorption desorption-fractional condensation according to claim 1, wherein the gas volatilization port of the oil storage device (15) is connected with the adsorption tank system through a prefilter (2).
7. The device for removing and recovering VOCs by adsorption, desorption and fractional condensation according to claim 6, wherein the prefilter (2) is selected from a bag-type dust collector, an electrostatic dust collector and a cyclone dust collector.
CN202122948579.2U 2021-11-25 2021-11-25 Device for adsorbing, desorbing, grading, condensing, removing and recycling VOCs (volatile organic compounds) Active CN216418832U (en)

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