Exhaust gas purification system

Abstract

The application belongs to the technical field of pharmaceutical chemical equipment, and particularly relates to a waste gas purification system, a bottom of a washing tower is communicated with a waste gas of a factory area, a top of the washing tower is communicated with an air inlet section of a steam-water separator, the washing tower is used for washing volatile organic compounds in the waste gas to generate organic solvents, the steam-water separator is used for trapping water mist in the organic solvents, an adsorption and desorption system comprises multiple adsorbers arranged side by side, any one of the multiple adsorbers is switched alternately in adsorption and desorption, steam with a preset pressure is introduced into the adsorber, one side of the adsorber is provided with an exhaust section, the other side of the adsorber is provided with interval-distributed air suction sections and desorption sections, the air suction sections are communicated with an air outlet section of the steam-water separator, the desorption sections are used for discharging the organic solvents, and an adsorption fan is respectively communicated with the exhaust sections of the multiple adsorbers and used for discharging the purified gas. The application can improve waste gas purification efficiency and realize safe, stable and standard emission.

Description

Technical Field

[0001] This application relates to the field of pharmaceutical and chemical equipment technology, and more specifically, to a waste gas purification system. Background Technology

[0002] In the pharmaceutical and chemical industries, chlorinated solvents are commonly used as solvents and extractants. During production, high-concentration waste gases are typically discharged via vacuum pumps, which, if left untreated, will cause air pollution. Currently, there are two main approaches to treating volatile organic compounds (VOCs) waste gases: the first is the destructive method, which involves incineration to break the carbon-hydrogen bonds of organic compounds. Commonly used equipment includes regenerative thermal oxidizers (RTOs), catalytic combustion furnaces, and direct-fired furnaces. However, the decomposition of waste gases produces acidic gases such as hydrogen chloride, which are highly corrosive to equipment and may also generate dioxins as secondary pollutants. The second approach is the transfer method, which uses adsorption, absorption, and condensation to convert the organic matter in the waste gas into solid or liquid forms before further treatment. However, due to the high concentration of waste gas emissions, traditional adsorption technologies suffer from low and unstable purification efficiency, rapid absorption liquid consumption, and high operating costs. While condensation can theoretically reduce the concentration of waste gas emissions, it is limited by the minimum temperature requirement for mechanical condensation, and to meet current emission standards, it is not technically feasible to achieve the desired results in one step using the condensation process.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide an exhaust gas purification system that aims to improve exhaust gas purification efficiency, eliminate secondary pollution, achieve safe and stable emission compliance, and provide good energy-saving effects.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a waste gas purification system, comprising a cleaning tower, a steam-water separator, an adsorption-desorption system, and an adsorption fan. One side of the cleaning tower is connected to the waste gas in the factory area, and the other side of the cleaning tower is connected to the inlet section of the steam-water separator. The cleaning tower is used to clean volatile organic compounds in the waste gas to generate organic solvents. The steam-water separator is used to capture water mist in the organic solvents. The adsorption-desorption system includes multiple adsorbers arranged side by side, each containing resin adsorption material. At least one adsorber is used to adsorb organic solvents, and at least one adsorber is used to desorb organic solvents. Any one of the multiple adsorbers alternates between adsorbing and desorbing organic solvents. Steam at a preset pressure is introduced into the adsorbers. An exhaust section is provided on one side of the adsorber, and an intake section and a desorption section are provided at intervals on the other side of the adsorber. The intake section is connected to the outlet section of the steam-water separator, and the desorption section is used to discharge saturated steam including organic solvents. The adsorption fan is connected to the exhaust sections of the multiple adsorbers respectively, and is used to discharge the purified gas.

[0006] In one possible implementation, a first valve body is provided on the exhaust section; and / or, a second valve body is provided on the intake section; and / or, a third valve body is provided on the desorption section; and / or, a fourth valve body is provided on the pipeline where the steam is located.

[0007] In one possible implementation, the exhaust gas purification system further includes a condensation component and an oil-water separator. The inlet end of the condensation component is connected to the desorption sections of multiple adsors respectively, for condensing saturated vapors including organic solvents. A fifth valve body is also provided on the pipeline between the desorption sections and the inlet end of the condensation component. The outlet end of the condensation component is connected to the oil-water separator, which is used to recover organic solvents.

[0008] In one possible implementation, the exhaust gas purification system further includes a circulating water tank and a first circulating pump. One end of the first circulating pump is connected to the circulating water tank, and the other end is connected to multiple adsorbers. Compressed air is also introduced into the adsorbers, and the circulating water tank is also connected to the desorption section.

[0009] In one possible implementation, a sixth valve body is provided on the pipeline between the first circulating pump and the top of the plurality of adsorbers; and / or, a seventh valve body is provided on the pipeline between the circulating water tank and the desorption section; and / or, an eighth valve body is provided on the pipeline containing the compressed air.

[0010] In one possible implementation, the outlet of the condenser assembly is also connected to the inlet section of the gas-water separator to recover uncondensed gas.

[0011] In one possible implementation, the air inlet section of the steam-water separator is also connected to the oil-water separator via a pipeline, and a ninth valve body is installed on the pipeline.

[0012] In one possible implementation, a spray layer and a packing layer are alternately arranged from top to bottom inside the cleaning tower. A second circulation pump is installed outside the cleaning tower and is connected to the spray layer through a pipeline. The spray layer includes multiple nozzles for spraying cleaning liquid, and the packing layer includes Pall ring packing.

[0013] In one possible implementation, a demister layer is also provided on the inner side of the top of the cleaning tower. The demister layer includes multiple hollow spheres for removing moisture from the organic solvent.

[0014] In one possible implementation, the condensation assembly includes a primary condenser and a secondary condenser arranged sequentially from the inlet end to the outlet end. The cold-side inlet temperature of the primary condenser is greater than the cold-side inlet temperature of the secondary condenser, the cold-side outlet temperature of the primary condenser is greater than the cold-side outlet temperature of the secondary condenser, the hot-side inlet temperature of the primary condenser is greater than the hot-side inlet temperature of the secondary condenser, and the hot-side outlet temperature of the primary condenser is greater than the hot-side outlet temperature of the secondary condenser.

[0015] The exhaust gas purification system provided in this application includes a cleaning tower, a steam-water separator, an adsorption-desorption system, and an adsorption fan. The cleaning tower cleans volatile organic compounds in the factory exhaust gas to generate organic solvents. The steam-water separator captures water mist from the organic solvents, reducing the humidity of the exhaust gas. The adsorption-desorption system includes multiple adsorbers arranged side by side. The resin adsorbent material inside the adsorbers has advantages such as small particle size, strong water resistance, and fast desorption. The organic solvents can be quickly desorbed through the repeated adsorption-desorption process of multiple adsorbers. Since the process of recovering organic solvents is only a physical process and does not produce other chemical substances, the organic solvent purity is high, the recovery efficiency is high, and the operating cost is low. The adsorption fan is connected to the exhaust section of each of the multiple adsorbers to provide power to discharge the purified gas without producing secondary pollutants such as dioxins. This improves the exhaust gas purification efficiency, achieves safe and stable emission standards, and has good energy-saving effects. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the exhaust gas purification system provided in the embodiments of this application;

[0018] Figure 2 yes Figure 1 A magnified structural diagram of region A in the middle;

[0019] Figure 3yes Figure 1 A magnified structural diagram of region B in the middle.

[0020] Explanation of key figure labels:

[0021] 100. Exhaust gas purification system;

[0022] 1. Cleaning tower; 11. Spray layer; 111. Nozzle; 12. Packing layer; 13. Demisting layer;

[0023] 2. Gas-liquid separator; 31. Adsorber; 311. Suction section; 312. Desorption section; 313. Exhaust section; 4. Adsorption fan; 32. Resin adsorption material;

[0024] 51. Primary condenser; 52. Secondary condenser; 53. Solvent tank; 54. Wastewater tank; 55. Solvent pump; 56. Wastewater pump;

[0025] 6. Oil-water separator; 7. Circulating water tank; 8. First circulating pump; 9. Second circulating pump; 10. Exhaust chimney;

[0026] F1, First valve body; F2, Second valve body; F3, Third valve body; F4, Fourth valve body; F5, Fifth valve body; F6, Sixth valve body; F7, Seventh valve body; F8, Eighth valve body; F9, Ninth valve body. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0028] Figure 1 This is a schematic diagram of the exhaust gas purification system provided in the embodiments of this application. Figure 2 yes Figure 1 A magnified structural diagram of region A in the middle.

[0029] See Figure 1 and Figure 2 This application provides a waste gas purification system 100, including a cleaning tower 1, a gas-water separator 2, an adsorption-desorption system and an adsorption fan 4.

[0030] One side of the cleaning tower 1 is connected to the waste gas from the plant area, and the other side is connected to the inlet section of the gas-water separator 2. The cleaning tower 1 is used to clean volatile organic compounds (VOCs) in the waste gas to generate organic solvents. In the pharmaceutical and chemical industries, chlorinated solvents are commonly used as solvents and extractants. High-concentration waste gas discharged from the plant area typically contains, but is not limited to, VOCs such as hydrogen chloride. The cleaning tower 1 contains a cleaning solution, which can be a 30% concentration sodium hydroxide alkaline absorbent solution with a pH value controlled between 9 and 11. The alkaline absorbent solution neutralizes the chlorine-containing waste gas, preventing secondary pollution.

[0031] The vapor-water separator 2 is used to capture water mist from organic solvents. Optionally, the outlet section of the vapor-water separator 2 adopts a combination of baffles and wire mesh to capture water mist carried out from the cleaning tower 1, thereby improving the dehumidification effect and reducing the humidity of the exhaust gas.

[0032] The adsorption-desorption system includes multiple adsorbers 31 arranged side by side. Each adsorber 31 contains a resin adsorbent material 32. At least one adsorber 31 is used to adsorb organic solvents, and at least one adsorber 31 is used to desorb organic solvents. Any one of the multiple adsorbers 31 alternates between adsorbing and desorbing organic solvents. Steam at a preset pressure is introduced into the adsorber 31. An exhaust section 313 is provided on one side of the adsorber 31, and an intake section 311 and a desorption section 312 are provided on the other side of the adsorber 31. The intake section 311 is connected to the exhaust section of the steam-water separator 2, and the desorption section 312 is used to discharge saturated steam containing organic solvents.

[0033] Optionally, steam at a preset pressure from an external pipeline is introduced into the top of the adsorber 31. After the resin adsorbent material 32 of any adsorber 31 reaches saturation with adsorbed organic solvent, it is regenerated by steam at a preset pressure so that the organic solvent is carried out of the resin pores by the steam and flows out from the desorption section 312.

[0034] The adsorber 31 switches between adsorption and desorption by adjusting its internal temperature or pressure. Any one of the multiple adsorbers 31 alternates between adsorbing and desorbing organic solvents. At least one adsorber 31 adsorbs organic solvents through the resin adsorption material 32, and at least one adsorber 31 desorbs organic solvents, thus achieving a cyclical adsorption-desorption process. The resin adsorption material 32 is arranged in a columnar shape inside the adsorber 31 and includes multiple resin particles. These resin particles have advantages such as small particle size, strong water resistance, and fast desorption. Optionally, the bottom of the adsorber 31 is provided with an alternately distributed intake section 311 and a desorption section 312. The intake section 311 is connected to the outlet section of the gas-water separator 2. The gas-water separator 2 dehumidifies the organic solvent, and then the dehumidified organic solvent gas is introduced into the multiple adsorbers 31 through the intake section 311 for a cyclical adsorption-desorption process.

[0035] In one example, the adsorption-desorption system includes three adsorbers 31 arranged side by side. Any two adsorbers 31 adsorb organic solvents through their respective resin adsorbent materials 32, while the remaining adsorber 31 desorbs the organic solvent. After adsorption saturation, the adsorber 31 is regenerated by steam at a preset pressure, such as 0.1 MPa, introduced through its top to carry the organic solvent out of the resin channels. This dual adsorption operation is maintained throughout the cyclic adsorption-desorption process, which improves the utilization rate of the resin adsorbent material 32 and enables rapid desorption of organic solvents.

[0036] The adsorption fan 4 is connected to the exhaust sections 313 of multiple adsorbers 31, providing power to discharge the purified gas. The exhaust sections 313 of the adsorbers 31 are used to discharge the purified air. Optionally, the adsorption fan 4 is connected to the exhaust chimney 10 via a pipeline, and the exhaust chimney 10 is used to discharge the purified air to the outside environment in compliance with standards. In this embodiment, installing the adsorption fan 4 at the end of the waste gas purification system 100 ensures that all pipelines and devices before the adsorption fan 4 are under negative pressure, preventing the entire waste gas purification system 100 from leaking waste gas into the outside environment.

[0037] Therefore, the process of purifying waste gas by the waste gas purification system 100 in this embodiment is as follows: After being collected, the chlorine-containing waste gas emitted from the factory first enters the cleaning tower 1 through a pipeline connected to the lower part of the cleaning tower 1. The volatile organic compounds such as hydrogen chloride in the chlorine-containing waste gas are cleaned and absorbed by the alkaline absorption liquid in the cleaning tower 1 to form organic solvents. The organic solvents are then introduced into the steam-water separator 2 through the pipeline at the top of the cleaning tower 1. After being dehumidified by the steam-water separator 2, the waste gas enters multiple adsorbers 31 of the adsorption-desorption system through the suction section 311. The organic solvents are adsorbed into each adsorber 31 by the negative pressure of the adsorption fan 4. The organic solvents are rapidly desorbed through the repeated adsorption-desorption process of multiple adsorbers 31. After the adsorbers 31 are saturated, steam at a preset pressure is introduced through the top of the adsorbers, so that the organic solvents are carried out from the resin channels by the steam. The organic solvents are recovered through the desorption section 312 of the adsorber 31. The purified air is discharged from the exhaust section 313 of the adsorber 31 by the power provided by the adsorption fan 4.

[0038] The exhaust gas purification system 100 provided in this application includes a cleaning tower 1, a steam-water separator 2, an adsorption-desorption system, and an adsorption fan 4. The cleaning tower 1 cleans volatile organic compounds in the exhaust gas from the factory area to generate organic solvents. The steam-water separator 2 captures water mist from the organic solvents to reduce the humidity of the exhaust gas. The adsorption-desorption system includes multiple adsorbers 31 arranged side by side. The resin adsorption material 32 installed in the adsorbers 31 has advantages such as small particle size, strong water resistance, and fast desorption. The organic solvents can be quickly desorbed through the repeated adsorption-desorption process of multiple adsorbers 31. Since the process of recovering organic solvents is only a physical process and does not produce other chemical substances, the organic solvent purity is high, the recovery efficiency is high, and the operating cost is low. The adsorption fan 4 is connected to the exhaust section 313 of multiple adsorbers 31 to provide power to discharge the purified gas without producing secondary pollutants such as dioxins, thereby improving the exhaust gas purification efficiency, achieving safe and stable emission standards, and having good energy-saving effects.

[0039] In some embodiments, a first valve body F1 is provided on the exhaust section 313; and / or, a second valve body F2 is provided on the intake section 311; and / or, a third valve body F3 is provided on the desorption section 312; and / or, a fourth valve body F4 is provided on the pipeline where the steam is located.

[0040] like Figure 1 and Figure 2 As shown, a first valve body F1 is installed on the exhaust section 313 of the adsorber 31, and a second valve body F2 is installed on the intake section 311 at the bottom of the adsorber 31. The first valve body F1 and the second valve body F2 are used to control the adsorber 31 to alternate between adsorbing organic solvents, desorbing organic solvents, and standby. In addition, a fourth valve body F4 is installed on the steam pipeline. When an adsorber 31 is saturated, the fourth valve body F4 is opened to control the steam to enter from the top of the adsorber 31. While ensuring that the exhaust gas continuously meets the emission standards, the amount of steam used is controlled according to the adsorption situation to avoid the adsorption and desorption rates being too fast. A third valve body F3 is installed on the desorption section 312 to control the emission of saturated steam containing organic solvents.

[0041] In some embodiments, the exhaust gas purification system 100 further includes a condensation component and an oil-water separator 6. The inlet end of the condensation component is connected to the desorption sections 312 of a plurality of adsors 31 respectively, for condensing saturated vapor including organic solvents. A fifth valve body F5 is also provided on the pipeline between the desorption section 312 and the inlet end of the condensation component. The outlet end of the condensation component is connected to the oil-water separator 6 for recovering organic solvents.

[0042] like Figure 1As shown, a fifth valve body F5 is also installed on the pipeline between the desorption section 312 and the inlet end of the condensation component. The saturated vapor containing organic solvent desorbed from the desorption section 312 of the adsorber 31 is condensed by the condensation component and then enters the oil-water separator 6. The discharge end of the condensation component is fixedly connected to the inlet end of the oil-water separator 6. The discharge end of the oil-water separator 6 is fixedly connected to the solvent tank 53 and the wastewater tank 54. The solvent tank 53 periodically recovers organic solvent through the solvent pump 55, and the wastewater tank 54 periodically discharges wastewater to a designated place for sewage treatment through the wastewater pump 56.

[0043] In some embodiments, the exhaust gas purification system 100 further includes a circulating water tank 7 and a first circulating pump 8. One end of the first circulating pump 8 is connected to the circulating water tank 7, and the other end is connected to a plurality of adsorbers 31. Compressed air is also introduced into the adsorbers 31. The circulating water tank 7 is also connected to the desorption section 312.

[0044] like Figure 1 As shown, after the resin adsorbent 32 is regenerated by steam desorption, the first circulation pump 8 provides power to pump room temperature water from the circulating water tank 7 into the columnar resin adsorbent 32 for circulation, rapidly cooling the resin adsorbent 32 for approximately 30 minutes. Compressed air from an external pipe network is also introduced to the top of the adsorber 31. After cooling, the compressed air is used to pressurize the water that has flowed through the columnar resin adsorbent 32 back into the circulating water tank 7 for continued use. This circulating water tank 7 serves two purposes: firstly, it rapidly cools the resin adsorbent 32; secondly, it has a fire-fighting function to prevent the resin adsorbent 32 from overheating and causing a fire.

[0045] After the resin adsorbent 32 has cooled down rapidly, compressed air is used again to purge the columnar resin adsorbent 32 and the remaining free water in the regeneration pipeline for about 30 minutes. After the columnar resin adsorbent 32 has been purged, it is ready to enter the next adsorption cycle.

[0046] In some embodiments, a sixth valve body F6 is provided on the pipeline between the first circulating pump 8 and the top of the adsorber 31; and / or, a seventh valve body F7 is provided on the pipeline between the circulating water tank 7 and the desorption section 312; and / or, an eighth valve body F8 is provided on the pipeline containing the compressed air.

[0047] like Figure 1 As shown, the sixth valve body F6 is used to control the delivery of room temperature water in the circulating water tank 7 to the columnar resin adsorbent material 32, the seventh valve body F7 is used to control the return of the circulating water after flowing through the columnar resin adsorbent material 32 to the circulating water tank 7, and the eighth valve body F8 is used to control the delivery of compressed air to the adsorber. The cooling process of the columnar resin adsorbent material 32 is controlled by the combination of the sixth valve body F6, the seventh valve body F7 and the eighth valve body F8.

[0048] In some embodiments, the outlet end of the condenser assembly is also connected to the inlet section of the gas-water separator 2 for recovering uncondensed gas.

[0049] like Figure 1 As shown, a portion of the organic solvent gas in the saturated vapor containing organic solvent desorbed from the desorption section 312 of the adsorber 31 is condensed by the condensation assembly and enters the oil-water separator 6. The other portion of the organic solvent gas that cannot be condensed returns to the inlet section of the steam-water separator 2 at the front end through the pipeline. Under the negative pressure of the adsorption fan 4, it re-enters the adsorption-desorption system for adsorption, ensuring that the entire waste gas purification system 100% continuously meets emission standards.

[0050] In some embodiments, the air inlet section of the steam-water separator 2 is also connected to the oil-water separator 6 via a pipeline, and a ninth valve body F9 is provided on the pipeline.

[0051] like Figure 1 As shown, the inlet section of the gas-water separator 2 is also used to intercept the solution that does not enter the outlet section. This solution mainly includes alkaline solutions such as sodium hydroxide and a small amount of dissolved organic matter. By periodically opening the ninth valve body F9, the solution intercepted by the gas-water separator 2 can be discharged to the oil-water separator 6 for separation and treatment, further improving the recovery efficiency.

[0052] Figure 3 yes Figure 1 A magnified structural diagram of region B in the middle.

[0053] In some embodiments, a spray layer 11 and a packing layer 12 are alternately arranged from top to bottom inside the cleaning tower 1. A second circulation pump 9 is provided outside the cleaning tower 1, and the second circulation pump 9 is connected to the spray layer 11 through a pipeline. The spray layer 11 includes a plurality of nozzles 111 for spraying cleaning liquid, and the packing layer 12 includes Pall ring packing.

[0054] like Figure 3As shown, chlorine-containing waste gas is drawn to the cleaning tower 1 for cleaning by the negative pressure of the adsorption fan 4. During the cleaning process, some organic matter enters the cleaning liquid from the gas phase. The cleaning tower 1 has alternating spray layers 11 and packing layers 12 arranged from top to bottom. Spray layers 11 and packing layers 12 can each be two layers, each with a transparent layer for observing the spraying process. The spray layer 11 includes multiple nozzles 111 for spraying the cleaning liquid. The nozzles 111 are 120° hollow cone nozzles to ensure sufficient gas-liquid contact and improve the purification effect. The cleaning liquid is delivered to the spray layer 11 from the bottom of the cleaning tower 1 by a second circulation pump 9, and the sprayed cleaning liquid contacts the chlorine-containing waste gas in a counter-current manner. Two second circulation pumps 9 can be used, one as a backup. The packing layer 12 includes Pall ring packing, which has advantages such as high throughput, low resistance, high separation efficiency, and high operational flexibility, saving packing volume. The exhaust gas flows from bottom to top through the packing layer 12, increasing the contact area between the exhaust gas and the cleaning liquid and improving the acid-base neutralization effect. After the cleaning liquid has circulated for a certain period of time, it is collected and enters the adsorption-desorption system for centralized purification treatment, without generating secondary pollution.

[0055] Understandably, depending on the composition and concentration of the chlorine-containing waste gas, the cleaning tower 1 can also be designed as two or more units connected in series to improve the cleaning efficiency of the waste gas.

[0056] In some embodiments, a demister layer 13 is further provided on the inner top of the cleaning tower 1. The demister layer 13 includes a plurality of hollow spheres for removing moisture from the organic solvent. Optionally, the hollow spheres have multiple cross-sections to increase the contact area between the hollow spheres and moisture, thereby further improving the dehumidification efficiency of the organic solvent.

[0057] In some embodiments, the condensation assembly includes a primary condenser 51 and a secondary condenser 52 arranged sequentially from the inlet end to the outlet end. The cold-side inlet temperature of the primary condenser 51 is greater than the cold-side inlet temperature of the secondary condenser 52, the cold-side outlet temperature of the primary condenser 51 is greater than the cold-side outlet temperature of the secondary condenser 52, the hot-side inlet temperature of the primary condenser 51 is greater than the hot-side inlet temperature of the secondary condenser 52, and the hot-side outlet temperature of the primary condenser 51 is greater than the hot-side outlet temperature of the secondary condenser 52.

[0058] like Figure 3As shown, the condensation assembly includes a primary condenser 51 and a secondary condenser 52 connected in series. Chilled water within the condensation assembly is supplied through an external pipe network, and the condensed return water flows back to the return pipe network. Optionally, the cold-side inlet temperature of the primary condenser 51 is 32°C, the cold-side outlet temperature is 37°C, the hot-side inlet temperature is 120°C, and the hot-side outlet temperature is 35°C. Optionally, the cold-side inlet temperature of the secondary condenser 52 is 7°C, the cold-side outlet temperature is 12°C, the hot-side inlet temperature is 35°C, and the hot-side outlet temperature is 20°C. The primary condenser 51 can rapidly condense most organic solvents, reducing the heat load; the secondary condenser 52 is used for deep condensation of difficult-to-condense components, improving the recovery rate of organic solvents. This embodiment, through the temperature gradient design of the primary condenser 51 and the secondary condenser 52, can achieve gradual cooling and energy saving, avoiding energy waste caused by direct low-temperature condensation.

[0059] It should be understood that, in the embodiments of this application, unless otherwise expressly specified and limited, the terms "connection," "fixed connection," "contact," etc., should be interpreted broadly. Those skilled in the art can understand the specific meanings of the various terms in the embodiments of this application according to the specific circumstances.

[0060] For example, the "connection" can be a fixed connection, a rotating connection, a flexible connection, a sliding connection, a one-piece molding, an electrical connection, a contact connection, or other connection methods; it can be a direct connection, or an indirect connection through an intermediate medium, or a connection within two components or an interaction between two components.

[0061] For example, a "fixed connection" can be a component that can be directly or indirectly fixedly connected to another component; a fixed connection can include mechanical connection, welding, bonding or integral molding, etc., wherein mechanical connection can include riveting, bolting, threaded connection, keying, snap-fit ​​connection, locking connection, plugging, etc., and bonding can include adhesive bonding and solvent bonding, etc.

[0062] It should also be understood that the “parallel” or “perpendicular” described in the embodiments of this application can be understood as “approximately parallel” or “approximately perpendicular”.

[0063] It should also be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0064] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0065] It should also be understood that the terms “length,” “width,” “up,” “down,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship (if any) based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0066] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims. In conclusion, the above description is merely a preferred embodiment of the technical solution of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A waste gas purification system, characterized in that, The system includes a cleaning tower, a gas-water separator, an adsorption-desorption system, and an adsorption fan. One side of the cleaning tower is connected to the waste gas from the plant area, and the other side of the cleaning tower is connected to the air inlet section of the gas-water separator. The cleaning tower is used to clean the volatile organic compounds in the waste gas to generate organic solvents. The gas-water separator is used to capture water mist from the organic solvents. The adsorption-desorption system includes multiple adsorbers arranged side by side, each adsorbent containing resin adsorption material. At least one adsorbent is used to adsorb the organic solvent, and at least one adsorbent is used to desorb the organic solvent. Any one of the multiple adsorbents alternates between adsorbing and desorbing the organic solvent. Steam at a preset pressure is introduced into each adsorbent. An exhaust section is provided on one side of each adsorbent, and an intake section and a desorption section are provided at intervals on the other side of each adsorbent. The intake section is connected to the exhaust section of the steam-water separator, and the desorption section is used to discharge saturated steam containing the organic solvent. The adsorption fan is connected to the exhaust section of each of the multiple adsorbers, and is used to discharge the purified gas.

2. The waste gas purification system as described in claim 1, characterized in that, A first valve body is provided on the exhaust section; And / or, the intake section is provided with a second valve body; And / or, the desorption section is provided with a third valve body; And / or, a fourth valve body is provided on the pipeline where the steam is located.

3. The waste gas purification system as described in claim 1, characterized in that, It also includes a condenser assembly and an oil-water separator. The inlet end of the condenser assembly is connected to the desorption sections of the multiple adsorbers respectively, and is used to condense saturated vapor including the organic solvent. A fifth valve body is also provided on the pipeline between the desorption section and the inlet end of the condenser assembly. The outlet end of the condenser assembly is connected to the oil-water separator, and the oil-water separator is used to recover the organic solvent.

4. The waste gas purification system as described in claim 1, characterized in that, It also includes a circulating water tank and a first circulating pump. One end of the first circulating pump is connected to the circulating water tank, and the other end is connected to a plurality of the adsorbers. Compressed air is also introduced into the adsorbers. The circulating water tank is also connected to the desorption section.

5. The waste gas purification system as described in claim 4, characterized in that, A sixth valve body is provided on the pipeline between the first circulating pump and the top of the plurality of adsors; And / or, a seventh valve body is provided on the pipeline between the circulating water tank and the desorption section; And / or, an eighth valve body is provided on the pipeline containing the compressed air.

6. The waste gas purification system as described in claim 3, characterized in that, The outlet end of the condenser assembly is also connected to the inlet section of the gas-water separator to recover uncondensed gas.

7. The waste gas purification system as described in claim 3, characterized in that, The air inlet section of the gas-water separator is also connected to the oil-water separator via a pipeline, and a ninth valve body is installed on the pipeline.

8. The waste gas purification system as described in claim 1, characterized in that, The cleaning tower has spray layers and packing layers alternately arranged from top to bottom. A second circulation pump is installed outside the cleaning tower and is connected to the spray layers through a pipeline. The spray layers include multiple nozzles for spraying cleaning liquid. The packing layers include Pall ring packing.

9. The waste gas purification system as described in claim 8, characterized in that, The cleaning tower is also provided with a demisting layer on the inner top side, which includes multiple hollow spheres for removing moisture from the organic solvent.

10. The waste gas purification system as described in claim 3, characterized in that, The condensation assembly includes a primary condenser and a secondary condenser arranged sequentially from the inlet end to the outlet end. The cold-side inlet temperature of the primary condenser is greater than the cold-side inlet temperature of the secondary condenser, the cold-side outlet temperature of the primary condenser is greater than the cold-side outlet temperature of the secondary condenser, the hot-side inlet temperature of the primary condenser is greater than the hot-side inlet temperature of the secondary condenser, and the hot-side outlet temperature of the primary condenser is greater than the hot-side outlet temperature of the secondary condenser.

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