CN211302579U - A waste gas treatment system for VOCs retrieves - Google Patents
A waste gas treatment system for VOCs retrieves Download PDFInfo
- Publication number
- CN211302579U CN211302579U CN201922160012.1U CN201922160012U CN211302579U CN 211302579 U CN211302579 U CN 211302579U CN 201922160012 U CN201922160012 U CN 201922160012U CN 211302579 U CN211302579 U CN 211302579U
- Authority
- CN
- China
- Prior art keywords
- gas
- vocs
- adsorption
- tank
- treatment system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses a waste gas treatment system for VOCs retrieves, with adsorption technology, membrane separation technique and condensation combination technology application, the desorption gas of adsorption equipment is handled to the application membrane separation technique of innovation, carry out membrane separation to VOCs component concentration effect through the performance, condensation process to VOCs's recovery has both been reinforceed, the VOCs concentration that makes the residual gas that oozes is less than the VOCs concentration that discharges the feed gas again mixes into adsorption equipment with discharging the feed gas, thereby make the adsorption equipment tail arrange and reach the environmental protection requirement more easily. The adsorption equipment is double-tank type adsorption/desorption regeneration equipment, the vacuum desorption regeneration process replaces the traditional steam desorption regeneration process, and the difficulty of recovering the water-soluble VOCs into solution and separating the water-soluble VOCs is solved.
Description
Technical Field
The utility model relates to a waste gas treatment system for VOCs retrieves, application field includes production fields such as chemical industry, pharmacy, and the specially adapted contains water-soluble VOCs's such as acetone, ethyl acetate, methyl alcohol, acetonitrile lower concentration waste gas treatment.
Background
In the production fields of chemical industry, pharmacy and the like, some waste gases discharged in production contain organic volatile matters (VOCs) and cause pollution to the environment, and how enterprises effectively recycle and treat the VOCs in the waste gases, the economic benefit and the environmental protection discharge are realized, and the method is an urgent requirement for ecological civilization construction.
For example, some pharmaceutical production needs solvents such as acetone, ethyl acetate and acetonitrile in the production process, and exhaust in the production process and exhaust in the storage tank area can take away a large amount of solvent gas, so that not only is the unit consumption cost of solvent production increased, but also the risk of environmental pollution is brought. The waste gas treatment has practical requirements on the application of high and new technologies, and the aim of comprehensive treatment is usually achieved by adopting the combined application of multiple technologies.
The membrane method gas separation technology is a high-tech technology developed in the world at present and is widely applied to the fields of oil refining and chemical engineering, such as nitrogen-hydrogen separation, organic steam recovery and the like. The method takes the gas pressure difference at two sides of a separation membrane as a driving force, and VOCs are used as fast-gas solution to spread and permeate the membrane, so that the concentration of the VOCs components is reduced at the raw material side of the membrane, and the VOCs components are enriched at the permeate gas side of the membrane, and the aim of recovering the VOCs is fulfilled through circulation and combined condensation. The process has the advantages of low energy consumption, compact equipment, small occupied area, large and simple operation flexibility, safe operation, no secondary pollution, convenient maintenance, easy equipment enlargement and the like, and is a novel technology application with high efficiency, energy conservation and environmental protection.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a waste gas treatment system for VOCs retrieves to VOCs in adsorption technology, membrane separation technique and the ingenious combination of condensation technology retrieve waste gas has innovated one set of waste gas treatment system, realizes economy and environmental protection dual benefit.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is: a waste gas treatment system for VOCs recovery, waste gas is sent into adsorption equipment as raw gas after passing through a first booster pump, the adsorption equipment is composed of two groups of adsorption tanks, an adsorption tank A and an adsorption tank B, gas is discharged after adsorption treatment of the adsorption tank A, desorption gas after passing through the adsorption tank B is pumped by a vacuum pump, then passes through a buffer tank and is sent into a second booster pump inlet, exhaust gas of the second booster pump is sent to a first heat exchanger as heat flow, liquid water which is pre-cooled and separated from the gas is discharged from the bottom of the first liquid separating tank after heat exchange, gas on the top of the first liquid separating tank is cooled by a second heat exchanger and then enters a second liquid separating tank, non-condensable gas on the top of the second liquid separating tank is sent to the first heat exchanger and the first heat exchanger in turn as cold flow, the gas after heat exchange and cold recovery enters a filter, the filtered gas enters membrane separation equipment, permeation gas of the membrane separation equipment is mixed with desorption gas, returning the residual gas of the membrane separation equipment to the inlet of the adsorption equipment; and the VOCs condensate at the bottom of the second separating tank is sent into a second heat exchanger as cold flow, and the condensate is sent out as a recovered VOCs product condensate after heat exchange and cold recovery.
Furthermore, the adsorption equipment adopts a vacuum desorption pressure swing adsorption technology, the adsorption tank A and the adsorption tank B realize the alternate work of the adsorption tanks A and B through the valve position state of a four-way valve which is connected, and when the adsorption tank A is used for adsorption, the adsorption tank B is used for desorption regeneration; when canister B is used for adsorption, canister a is used for desorption regeneration.
Furthermore, a two-way valve is arranged at the front end of the discharge port and is used for controlling the flow of the purge gas in the later period of desorption.
Further, the vacuum pump adopts a dry screw vacuum pump, a reciprocating vacuum pump or a water ring vacuum pump, and is used for providing a vacuum desorption negative pressure condition for the adsorption equipment and providing a negative pressure condition for the membrane separation permeation side.
Further, the condensation system consists of at least two stages of condensation, wherein the first stage of condensation is used for separating water in the gas; secondary condensation is used to separate the vocs condensate from the gas.
Furthermore, a stainless steel wire defoaming element is arranged in the liquid separating tank, and water precooled from the gas is separated in a liquid state and discharged from the bottom of the tank.
Furthermore, the packing in the adsorption tank is composite bed type packing for absorbing/desorbing VOCs.
Further, the condenser is a refrigeration ice machine (which can be one to three stages, each stage has an independent refrigeration cycle) using low-temperature refrigerant as an internal circulation energy carrier, or a two-stage series spiral wound tube condenser, and the cooling medium is usually wind, normal-temperature water, and chilled water at 7 ℃ and-7 ℃.
Furthermore, the filter is a built-in stainless steel sintered felt/mesh filter element or a glass fiber coalescence filter element, can adopt single stage or multistage, and is arranged into two groups one by one.
Furthermore, the membrane separation equipment is a combination of a plurality of VOC special membrane separators in a serial or parallel mode, and the membrane core component is a separation membrane component which resists organic solvents and has a high VOC separation coefficient.
Furthermore, the first heat exchanger in the primary condensation is a two-way heat exchanger, one way of which is used for flowing hot fluid gas, and the other way of which is used for flowing cold fluid gas, and a spiral plate type and a winding pipe type are adopted, so that cold and hot air flows are in non-contact and sufficient heat exchange;
and the second heat exchanger in the second-stage condensation is a three-way heat exchanger which is used for carrying hot flow gas, the other two ways are respectively used for carrying cold flow gas and cold flow liquid, and a winding pipe type is adopted, so that cold and hot air flows are in non-contact and sufficient heat exchange.
The membrane method gas separation technology is a high-tech technology developed in the world at present and is widely applied to the fields of oil refining and chemical engineering, such as nitrogen-hydrogen separation, organic steam recovery and the like. The method takes the gas pressure difference at two sides of a separation membrane as a driving force, and VOCs are used as fast-gas solution to spread and permeate the membrane, so that the concentration of the VOCs components is reduced at the raw material side of the membrane, and the VOCs components are enriched at the permeate gas side of the membrane, and the aim of recovering the VOCs is fulfilled through circulation and combined condensation. The process has the advantages of low energy consumption, compact equipment, small occupied area, large and simple operation flexibility, safe operation, no secondary pollution, convenient maintenance, easy equipment enlargement and the like, and is a novel technology application with high efficiency, energy conservation and environmental protection. The utility model discloses in the system, the membrane separation equipment import side is provided the malleation by booster compressor two, provides the negative pressure by the vacuum pump at membrane separation equipment permeation gas outlet side, and malleation and negative pressure provide separation membrane both sides operating pressure difference in the membrane separation equipment jointly.
The utility model has the advantages that: a whole set of VOCs waste gas treatment system with lower concentration is developed by applying an adsorption technology, a membrane separation technology and a condensation combination technology. (the lower concentration means that the adsorption technology of the application is close to the upper limit in the standard-reaching applicable concentration range, and has the recovery value of VOCs).
Secondly, the desorption gas of the adsorption equipment is treated by innovatively applying a membrane separation technology, and the VOCs components are concentrated by performing membrane separation, so that the recovery of VOCs by a condensation process is enhanced, and the concentration of VOCs of residual gas is lower than that of VOCs of the discharged raw material gas and the discharged raw material gas are mixed into the adsorption equipment, so that the tail discharge of the adsorption equipment can meet the environmental protection requirement more easily.
The adsorption equipment is double-tank type adsorption/desorption regeneration equipment, and the vacuum desorption regeneration process replaces the traditional steam desorption regeneration process, thereby solving the difficulty of recovering the water-soluble VOCs into solution and then separating the water-soluble VOCs.
Drawings
FIG. 1 is a block diagram of an exhaust treatment system for VOCs recovery.
Detailed Description
The invention will be further explained with reference to specific embodiments.
As shown in figure 1, a waste gas treatment system for VOCs recovery, waste gas (1) is sent into adsorption equipment as feed gas through a first booster 20 and then gas (2), the adsorption equipment is composed of two groups of adsorption tanks, an adsorption tank A21 and an adsorption tank B22, gas is discharged as tail gas (19) after being adsorbed by the adsorption tank A21, desorbed gas (3) passing through the adsorption tank B22 is pumped by a vacuum pump 23 (4), then passes through a buffer tank 24, material (5) is sent into a second booster 25 inlet, second booster 25 exhaust gas (6) is sent to a first heat exchanger 26 as heat flow, gas (7) after heat exchange is firstly discharged from the bottom of the first liquid separating tank 27 to pre-cool separated liquid water (15), gas (8) at the top of the first liquid separating tank 27 is cooled by the second heat exchanger 28, cooled gas (9) enters a condenser 29, and gas (10) after heat exchange enters a second liquid separating tank 30, noncondensable gas (11) on the top of the liquid separation tank II 30 is used as cold flow and is sequentially sent to a heat exchanger II 28 and a heat exchanger I26, the gas (13) after heat exchange and cold quantity recovery enters a filter 31, the filtered gas (14) enters a membrane separation device 32, permeation gas (16) of the membrane separation device 32 and desorption gas (3) of an adsorption device are mixed and return to an inlet of a vacuum pump 23, and residual gas (15) of the membrane separation device 32 returns to the inlet of the adsorption device; and VOCs condensate (17) at the bottom of the separation tank II 30 is sent into a heat exchanger II 28 as cold flow, and is sent out as recovered VOCs product condensate (18) after heat exchange and cold recovery.
The adsorption equipment adopts a vacuum desorption pressure swing adsorption technology, the adsorption tank A and the adsorption tank B realize the alternate work of the adsorption tank A and the adsorption tank B through the valve position state of a four-way valve 33 which is connected, and when the adsorption tank A is used for adsorption, the adsorption tank B is used for desorption regeneration; when canister B is used for adsorption, canister a is used for desorption regeneration.
The front end of the discharge port is provided with a two-way valve 34 for controlling the flow of the purge gas at the later stage of desorption.
The vacuum pump 23 is a dry screw vacuum pump, a reciprocating vacuum pump or a water ring vacuum pump, and is used for providing a vacuum desorption negative pressure condition for the adsorption apparatus and a negative pressure condition for the membrane separation permeation side.
The condensation system consists of at least two stages of condensation, the first stage of condensation being used to separate the water (15) from the gas; secondary condensation is used to separate the VOCSs condensate (17) from the gas.
The stainless steel wire defoaming element is arranged in the liquid separating tank, and water precooled from gas is separated in a liquid state and discharged from the bottom of the tank.
The filler in the adsorption tank is a composite bed type filler for VOCs adsorption/desorption.
The condenser is a refrigeration ice machine (can be one to three stages, each stage has an independent refrigeration cycle) using low-temperature refrigerant as an internal circulation energy carrier, and can also be a two-stage series spiral winding pipe type condenser, and cooling media are generally wind, normal-temperature water, and chilled water at 7 ℃ and-7 ℃.
The filter is a built-in stainless steel sintered felt/mesh filter element or a glass fiber coalescence type filter element, can adopt single stage or multistage, and is arranged into two groups by one opening and one standby.
The membrane separation equipment is a combination of a plurality of VOC special membrane separators in a serial or parallel mode, and the membrane core component is a separation membrane component which resists organic solvent and has high VOC separation coefficient.
The first heat exchanger in the primary condensation is a two-way heat exchanger, one way is used for flowing hot fluid gas (6), the other way is used for flowing cold fluid gas (12), and a spiral plate type and a winding pipe type are adopted, so that cold and hot air flows are in non-contact and sufficient heat exchange;
the second heat exchanger in the second-stage condensation is a three-way heat exchanger which is used for feeding hot flow gas 8, and the other two ways are respectively used for feeding cold flow gas (11) and cold flow liquid (17), and a winding pipe type is adopted, so that cold and hot air flows are in non-contact and sufficient heat exchange.
In connection with the example base data: taking the waste gas produced by a certain chemical plant in China as an example, the concentration of acetone contained in the waste gas is 10g/m3The other components are air, and the exhaust emission is 4000m3/h。
Implementation and effect:
the project implementation refers to the attached drawing of a facility system, and the adsorption equipment is in a double-tower form (alternately working), and is filled with a composite bed; the inlet gas of the adsorption equipment is pressurized by a high-pressure Roots blower to 98 KPaG. The tail gas of the adsorption equipment reaches the environmental protection emission index: TVOC: 50mg/m3。
The membrane separation equipment adopts a parallel connection form of a plurality of groups of membrane separators; the gas pressure at the inlet of the membrane separator is provided by the pressurization of 98KPaG of the Roots blower, the pressurized gas is condensed by a condensing system, the non-condensable gas is filtered and then enters the membrane separator, and the membrane separation permeation gas is vacuumized by a dry screw vacuum pump to establish negative pressure of 30 KPaA. The desorption gas of the adsorption equipment and the membrane separation permeation gas are mixed and then return to the inlet of the vacuum pump, and a buffer tank is arranged between the outlet of the vacuum pump and the inlet of the Roots blower.
Gas obtained in a condensation system is precooled by a heat exchanger at the gas temperature of 1 ℃, and is discharged from the bottom of a separation water tank of a primary liquid separation tank; an ice maker is used as a condenser, gas is cooled to-30 ℃ from about 1 ℃, and water at normal temperature is used as an external circulation refrigerant of the ice maker. And acetone condensate at the bottom of the secondary liquid separation tank is delivered for production and reutilization for recovered products. And a heat exchanger is arranged between the ice maker and the Roots blower to recover the air outlet cold quantity of the separation tank.
After membrane separation and condensation recovery, the content of acetone in the membrane separation tail gas is controlled to be about 7g/m3And the concentration of the acetone is lower than that of the emission source gas, and the acetone returns to the inlet of the adsorption equipment to be mixed with the emission source gas, so that the concentration of the acetone in the raw material gas entering the adsorption equipment can be further reduced, and the tail gas treated by the adsorption equipment can be discharged up to the standard more easily.
The recovery rate of acetone reaches more than 99 percent, economic benefits are brought to users, the complete equipment adopts an automatic instrument and an unattended design, the total power consumption is about 180KW, and the operating cost is low.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the concept of the present invention within the technical scope of the present invention.
Claims (10)
1. A waste gas treatment system for VOCs recovery is characterized in that waste gas is sent into adsorption equipment as raw gas after passing through a first booster, the adsorption equipment comprises two groups of adsorption tanks A and an adsorption tank B, the gas is discharged after being subjected to adsorption treatment by the adsorption tank A, desorption gas after passing through the adsorption tank B is pumped by a vacuum pump, then the desorption gas passes through a buffer tank and is sent into an inlet of a second booster, exhaust gas of the second booster is sent to a first heat exchanger as hot flow, liquid water obtained by precooling and separation is discharged from the gas after heat exchange through the bottom of the first liquid separation tank, gas on the top of the first liquid separation tank is cooled by a second heat exchanger and then enters a second liquid separation tank, noncondensable gas on the top of the second liquid separation tank is sent to the first heat exchanger and the first heat exchanger in sequence as cold flow, the gas after heat exchange and cold recovery enters a filter, the filtered gas enters membrane separation equipment, and permeation gas of the membrane separation equipment is mixed with desorption gas of, returning the residual gas of the membrane separation equipment to the inlet of the adsorption equipment; and the VOCs condensate at the bottom of the second separating tank is sent into a second heat exchanger as cold flow, and the condensate is sent out as a recovered VOCs product condensate after heat exchange and cold recovery.
2. The exhaust gas treatment system for recovering VOCs according to claim 1, wherein the adsorption equipment adopts vacuum desorption pressure swing adsorption, the adsorption tank A and the adsorption tank B realize the alternate operation of the adsorption tanks A and B through the valve position state of a four-way valve connected with each other, and when the adsorption tank A is used for adsorption, the adsorption tank B is used for desorption regeneration; when canister B is used for adsorption, canister a is used for desorption regeneration.
3. The exhaust treatment system for recovering VOCs as claimed in claim 1, wherein a two-way valve is provided at the front end of the discharge port to control the flow rate of the purge gas at the later stage of desorption.
4. The exhaust gas treatment system for recovery of VOCs of claim 1, wherein the vacuum pump is a dry screw vacuum pump, a reciprocating vacuum pump or a water ring vacuum pump for providing a vacuum desorption negative pressure condition for the adsorption apparatus and a negative pressure condition for the membrane separation permeate side.
5. The exhaust treatment system for recovery of VOCs as claimed in claim 1, wherein the condensing system comprises at least two stages of condensation, the first stage of condensation being used to separate the water content of the gas; secondary condensation is used to separate the vocs condensate ⒄ from the gas.
6. The exhaust gas treatment system for recovering VOCs as claimed in claim 1, wherein a stainless steel wire defoaming element is installed in the liquid separating tank to separate water pre-cooled from the gas in a liquid state and discharge the water from the bottom of the tank.
7. The exhaust treatment system for recovery of VOCs of claim 1, wherein the packing in the adsorption tank is a composite bed packing for adsorption/desorption of VOCs.
8. The exhaust treatment system for recovery of VOCs of claim 1, wherein the filter is a sintered felt/mesh filter or a coalesced glass fiber filter with built-in stainless steel, and can be single-stage or multi-stage, and is arranged in two groups, one for one.
9. The exhaust treatment system for VOCs recovery of claim 1, wherein said membrane separation device is a combination of a plurality of VOC specific membrane separators in series or in parallel, and the membrane module is an organic solvent resistant separation membrane module with a high VOC separation factor.
10. The exhaust treatment system for VOCs recovery of claim 5,
the first heat exchanger in the primary condensation is a two-way heat exchanger, one way of which is used for flowing hot flow gas, and the other way of which is used for flowing cold flow gas, and a spiral plate type and a winding pipe type are adopted, so that cold and hot air flows are in non-contact and sufficient heat exchange;
and the second heat exchanger in the second-stage condensation is a three-way heat exchanger which is used for carrying hot flow gas, the other two ways are respectively used for carrying cold flow gas and cold flow liquid, and a winding pipe type is adopted, so that cold and hot air flows are in non-contact and sufficient heat exchange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922160012.1U CN211302579U (en) | 2019-12-05 | 2019-12-05 | A waste gas treatment system for VOCs retrieves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922160012.1U CN211302579U (en) | 2019-12-05 | 2019-12-05 | A waste gas treatment system for VOCs retrieves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211302579U true CN211302579U (en) | 2020-08-21 |
Family
ID=72051833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922160012.1U Active CN211302579U (en) | 2019-12-05 | 2019-12-05 | A waste gas treatment system for VOCs retrieves |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211302579U (en) |
-
2019
- 2019-12-05 CN CN201922160012.1U patent/CN211302579U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108211648B (en) | Heat recovery type condensation and temperature and pressure swing adsorption combined process oil gas recovery device | |
| CN102899064B (en) | Gas recovery system for oil | |
| CN201244430Y (en) | Apparatus for collecting carbonic anhydride in coal-fired plant flue gas | |
| CN205084577U (en) | Retrieve device that multicomponent high concentration low discharge is interrupted organic waste gas active ingredient | |
| CN108355461A (en) | Sulfur hexafluoride and nitrogen mixed gas purification separation purifying plant and its reclaiming clean purify sulfur hexafluoride method | |
| CN212141530U (en) | Small vehicle-mounted VOCs recovery processing equipment | |
| CN202440471U (en) | Oil gas recovery system | |
| CN107641535B (en) | Device and method for separating and purifying various gases by membrane cryogenic coupling | |
| CN110755994A (en) | A waste gas treatment system for VOCs retrieves | |
| CN211537120U (en) | Organic waste gas purification device and system adopting thermal nitrogen desorption | |
| CN211302579U (en) | A waste gas treatment system for VOCs retrieves | |
| CN202246576U (en) | Low-temperature condensation absorption recycling device for oil gas | |
| CN111589264A (en) | Organic solvent waste gas compression condensation and membrane filtration recovery device thereof | |
| CN103589550A (en) | Carbon dioxide balanced system for beer brewing technology | |
| CN217661593U (en) | Device for purifying and recovering carbon dioxide by low-temperature rectification | |
| CN113908663B (en) | Pressurized multistage 'absorption, condensation and adsorption' module combined organic waste gas recovery method | |
| CN215161044U (en) | High-purity carbon dioxide gas purification device | |
| CN109012048B (en) | VOCs emission control complete equipment with membrane separation and emission control method thereof | |
| RU2432535C2 (en) | System of low temperature of gas separation at gas condensate deposit | |
| CN113440886A (en) | High-pressure cryogenic combined type VOCs gas recovery device and recovery method | |
| CN211328784U (en) | Oil gas recovery system | |
| CN203512447U (en) | Oil tank breathing gas recovery system | |
| CN110295072B (en) | Small skid-mounted natural gas purification device and purification method | |
| CN209393027U (en) | A kind of high concentration VOCs tail gas qualified discharge processing unit based on condensation catalysis oxidation | |
| CN202470621U (en) | Air separation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |