Organic solvent recovery system

Abstract

The invention discloses an organic solvent recovery system which comprises a fixing frame, a pretreatment mechanism, a primary adsorption tank, a secondary adsorption tank, a condensation mechanism, a supergravity separation mechanism, a solvent recovery tank, a steam furnace and a vacuum adsorption pump, and a chimney is arranged at the rear end of the fixing frame. A spiral activated carbon plate is arranged in the first-stage adsorption tank, an internal reinforcing column and a central electrode are arranged in the middle of the first-stage adsorption tank, an interlayer electrode is arranged in the plate, and a reversible power supply and a wiring pipe are arranged at the bottom; pretreated waste gas sequentially passes through two stages of adsorption tanks, the first-stage adsorption tank utilizes activated carbon and an electrode for adsorption, and the second-stage adsorption tank treats a special solvent through membrane separation. During desorption, the steam furnace and the vacuum adsorption pump cooperate with each other and cooperate with electric field adjustment. Then purification is performed through condensation and a supergravity separation mechanism, the solvent is stored in a recovery tank, a small amount of waste gas is discharged through a chimney, and the organic solvent with complex components can be efficiently recovered.

Description

Technical Field

[0001] The invention relates to the field of environmental protection, and in particular to an organic solvent recovery system. Background Art

[0002] In the process of industrial production, organic solvents are widely used in many fields such as chemical industry, electronics, pharmaceuticals, printing, etc. However, the large-scale use of organic solvents leads to the generation of a large amount of waste gas containing organic solvents. If these waste gases are directly discharged into the atmosphere, they will cause serious harm to the environment and human health. On the one hand, organic solvents evaporate into the air to form volatile organic compounds (VOCs). VOCs are important precursors of atmospheric pollution problems such as photochemical smog and ozone, which will aggravate air pollution and affect air quality and climate; on the other hand, many organic solvents are toxic. Long-term exposure to an environment containing these organic solvents will cause damage to the human respiratory system, nervous system, immune system, etc.

[0003] At present, the recovery and treatment of organic solvents has become an environmental problem that needs to be solved urgently in industrial production. Traditional methods for recovering organic solvents include adsorption, condensation, membrane separation, etc., but these methods often have some limitations when used alone. For example, the simple adsorption method requires effective desorption means to restore the adsorbent performance and recover the solvent after the adsorbent is saturated; the condensation method has a low recovery efficiency for low-concentration, low-boiling-point organic solvents; and the membrane separation method has problems such as membrane pollution and high cost.

[0004] In addition, with the increasingly stringent environmental regulations, the standards for organic solvent waste gas emissions are also getting higher and higher, which requires the organic solvent recovery system to not only have high recovery efficiency, but also be able to operate stably and efficiently to meet environmental protection requirements. In actual industrial applications, the organic solvent composition in the waste gas is complex, and the concentration and flow rate vary greatly, which further increases the difficulty of organic solvent recovery.

[0005] In view of these problems, the prior art has proposed some improvement plans, but there are still certain limitations. For example, the patent with publication number CN220257590U discloses an organic waste gas solvent recovery device, but it still has the following shortcomings: for some mixed solvents with complex components, the existing recovery device may not be able to achieve efficient separation and recovery. Different solvents have different physical properties such as boiling point and volatility. It is difficult to accurately control parameters such as temperature and pressure during the recovery process, resulting in some solvents being unable to be completely recovered, or the purity after recovery is not high. Summary of the invention

[0006] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention aims to provide an organic solvent recovery system, which solves the problems existing in the prior art. The invention comprehensively considers a variety of technologies such as adsorption, condensation, and supergravity separation, and innovatively designs the adsorption tank in the key equipment in the adsorption process. The activated carbon plate is spiral-shaped, which greatly increases the contact area and time between the exhaust gas and the activated carbon. The central electrode and interlayer electrode arranged inside it can generate an electric field through a reversible power supply to enhance the adsorption effect on organic solvent molecules. Both polar and non-polar molecules can be adsorbed more efficiently, and desorption can be assisted by changing the direction of the electric field during the desorption stage. At the same time, the internal reinforcement column ensures the stability of the activated carbon plate structure, and the wiring tube symmetrically arranged at the bottom of the tank body ensures the stable connection between the electrode and the power supply. By setting a specially structured activated carbon plate and an electrode system in the adsorption tank, and combining equipment such as a steam furnace and a vacuum adsorption pump, a new organic solvent recovery system is constructed, which aims to solve the problems existing in the existing organic solvent recovery technology and improve the efficiency and quality of organic solvent recovery.

[0007] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an organic solvent recovery system, comprising a fixed frame, a pretreatment mechanism is arranged on the right side of the fixed frame, a first-level adsorption tank is fixed at the lower end of the fixed frame, a second-level adsorption tank is arranged on the left side of the first-level adsorption tank, a condensation mechanism is arranged at the front of the fixed frame, a supergravity separation mechanism is connected to the rear end of the condensation mechanism, a solvent recovery tank is connected to the left side of the supergravity separation mechanism, a steam furnace is arranged at the rear end of the fixed frame, and a vacuum adsorption pump is arranged at the upper end of the fixed frame.

[0008] Preferably, the primary adsorption tank comprises a tank body, an activated carbon plate is fixed inside the tank body, an internal reinforcement column is arranged in the middle of the activated carbon plate, a central electrode is arranged in the middle of the internal reinforcement column, and an interlayer electrode is arranged inside the activated carbon plate.

[0009] Preferably, the activated carbon plate is spiral-shaped, and the central electrode is arranged on the central axis of the spiral of the activated carbon plate.

[0010] Preferably, the interlayer electrode is a metal sheet, which is spirally embedded inside the activated carbon plate.

[0011] Preferably, the central electrode and the interlayer electrodes are insulated from the activated carbon plates.

[0012] Preferably, wiring tubes are symmetrically arranged at the bottom of the tank body.

[0013] Preferably, a reversible power supply is provided at the bottom of the tank body, and the positive and negative electrodes of the reversible power supply are connected to the two ends of the central electrode. The reversible power supply is used to generate an electric field. In the adsorption stage, it provides a suitable electric field for the central electrode. After the positive and negative electrodes are connected to the two ends of the central electrode, the central electrode generates an electric field around the activated carbon plate, thereby enhancing the adsorption effect of the organic solvent molecules. Moreover, since it is a reversible power supply, in the desorption stage, the direction of the electric field can be changed by changing the direction of the current, so that the organic solvent molecules originally adsorbed on the activated carbon plate are subjected to the opposite electric field force to that during adsorption, thereby promoting the desorption of the organic solvent molecules from the activated carbon plate, and realizing the recycling of the adsorption tank.

[0014] Preferably, the number of primary adsorption tanks is two, forming a parallel processing mechanism, even if one of the adsorption tanks has some minor faults or the adsorption effect fluctuates slightly during operation, the other adsorption tank can still work normally and continue to adsorb the exhaust gas, thereby ensuring the stability and continuity of the whole system for adsorption of organic solvents.

[0015] Preferably, the vacuum adsorption pump and the primary adsorption tank are connected via a pipeline.

[0016] Preferably, a chimney is provided at the rear end of the fixing frame.

[0017] (III) Beneficial effects The purpose of the present invention is to provide an organic solvent recovery system. In terms of recovery capacity, primary and secondary adsorption tanks are provided. The capture of organic solvents is enhanced by two-stage adsorption, and the spiral activated carbon plate in the adsorption tank increases the contact area and time between the exhaust gas and the activated carbon. The built-in electrode system enhances the adsorption effect and greatly improves the adsorption efficiency of organic solvents. In terms of recovery quality, the condensation mechanism and the supergravity separation mechanism work together to effectively purify the organic solvent and improve its purity for reuse. The operation mode is flexible and stable, the reversible power supply can adjust the electric field according to the adsorption and desorption stages, and the steam furnace can assist in desorption and extend the life of the activated carbon. The system has good safety and environmental protection. The vacuum adsorption pump ensures safe operation and maintains appropriate pressure. The chimney provides a compliant emission channel for a very small amount of exhaust gas to avoid harm to the environment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of an overall organic solvent recovery system of the present invention; Figure 2 It is a schematic diagram of a primary adsorption tank in an organic solvent recovery system of the present invention; Figure 3 A schematic diagram of an activated carbon plate in an organic solvent recovery system of the present invention; Figure 4 for Figure 3 An enlarged view of point A in the schematic diagram of an activated carbon plate in an organic solvent recovery system of the present invention; Figure 5 A schematic diagram of overall adsorption and discharge in an organic solvent recovery system of the present invention; Figure 6 A schematic diagram of overall desorption and solvent recovery in an organic solvent recovery system of the present invention; In the figure: 1-fixed frame, 2-pretreatment mechanism, 3-primary adsorption tank, 4-secondary adsorption tank, 5-condensation mechanism, 6-supergravity separation mechanism, 7-solvent recovery tank, 8-steam furnace, 9-vacuum adsorption pump, 10-chimney, 31-tank body, 32-activated carbon plate, 33-internal reinforcement column, 34-center electrode, 35-interlayer electrode, 36-wiring pipe, 37-reversible power supply. DETAILED DESCRIPTION

[0019] The following will be combined with the attached examples of the present invention Figure 1-Figure 6 A clear and complete description is given to the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] The present invention provides a technical solution: an organic solvent recovery system, such as Figure 1 As shown, it includes a fixed frame 1, a pretreatment mechanism 2 is arranged on the right side of the fixed frame 1, a primary adsorption tank 3 is fixed at the lower end of the fixed frame 1, a secondary adsorption tank 4 is arranged on the left side of the primary adsorption tank 3, a condensation mechanism 5 is arranged at the front of the fixed frame 1, a super gravity separation mechanism 6 is connected to the rear end of the condensation mechanism 5, a solvent recovery tank 7 is connected to the left side of the super gravity separation mechanism 6, a steam furnace 8 is arranged at the rear end of the fixed frame 1, and a vacuum adsorption pump 9 is arranged at the upper end of the fixed frame 1. A chimney 10 is arranged at the rear end of the fixed frame 1.

[0021] The fixed frame 1 serves as the supporting structure of the entire organic solvent recovery system, and reasonably fixes each functional component in the corresponding position to ensure the stability and integrity of the system. The pretreatment mechanism 2 is mainly used for preliminary treatment of waste gas containing organic solvents. It includes a filter and a cooler, which can remove impurities in the waste gas, such as particulate matter, dust, etc., to prevent these impurities from entering subsequent adsorption tanks and other equipment, avoid damage to the equipment or block the pores of activated carbon, and affect the adsorption effect. At the same time, the pretreatment mechanism can also adjust the temperature, humidity and other parameters of the waste gas to make the waste gas more suitable for subsequent recovery and treatment. The primary adsorption tank 3 is used to adsorb the pretreated waste gas to remove most of the organic solvents. The secondary adsorption tank 4 is used as a supplement to the primary adsorption tank to re-adsorb the waste gas that still has a small amount of organic solvents after the primary adsorption, further reduce the content of organic solvents in the waste gas, and ensure that the waste gas after two-stage adsorption can meet the environmental protection emission standards. The condensation mechanism 5 is used to cool the desorbed organic solvent vapor into a liquid state. During the desorption process, the organic solvent is desorbed from the surface of the activated carbon to form steam. After these steams enter the condensation mechanism, the heat is taken away by the cooling medium, and the organic solvent steam is converted into liquid, which preliminarily realizes the separation of the solvent from other gases, providing conditions for subsequent supergravity separation and solvent recovery. The supergravity separation mechanism 6 further separates the liquid mixture after condensation. By utilizing the effect of the supergravity field, the impurities and residual water in the solvent are separated from the organic solvent under the action of centrifugal force, effectively improving the purity of the recovered solvent, ensuring that the recovered organic solvent is of higher quality and can be better reused. The solvent recovery tank 7 is used to collect the high-purity organic solvent obtained after supergravity separation. It is the final storage container for organic solvent recovery. The stored recovered solvent can be reused in industrial production and other links to achieve the recycling of solvents, reduce production costs and reduce the impact on the environment.

[0022] The steam furnace 8 is used to provide steam for the desorption of the activated carbon in the adsorption tank. After the activated carbon is saturated with adsorption, the steam generated by the steam furnace enters the adsorption tank, and the high temperature and high energy of the steam are used to promote the desorption of organic solvent molecules from the surface of the activated carbon. At the same time, the steam can also clean the pores of the activated carbon, restore the adsorption performance of the activated carbon, extend the service life of the activated carbon, and ensure the long-term stable operation of the adsorption tank. The vacuum adsorption pump 9 is used to reduce the pressure in the adsorption tank during the desorption process, promote the desorption of organic solvents from the surface of the activated carbon, and prevent abnormal pressure in the system to ensure the safe operation of the system. The chimney 10 is used to provide a safe exhaust gas discharge channel for the entire organic solvent recovery system.

[0023] The primary adsorption tank 3 includes a tank body 31, an activated carbon plate 32 is fixed inside the tank body 31, an internal reinforcement column 33 is arranged in the middle of the activated carbon plate 32, a central electrode 34 is arranged in the middle of the internal reinforcement column 33, and an interlayer electrode 35 is arranged inside the activated carbon plate 32. The tank body 31 is the main structure of the primary adsorption tank, which provides a relatively closed space environment for the entire adsorption process. Its function is to accommodate other internal components, such as activated carbon plates, internal reinforcement columns, electrodes, etc., to ensure that the exhaust gas can fully contact with the activated carbon plate in the tank body to perform the adsorption operation of the organic solvent, while preventing exhaust gas leakage, and ensuring the effectiveness and safety of the adsorption process. The activated carbon plate 32 is a key component for adsorbing organic solvents. Activated carbon itself has a huge specific surface area and rich pore structure, and can adsorb organic solvent molecules in the exhaust gas on its surface and in its pores through physical adsorption. The internal reinforcement column 33 mainly plays a role in enhancing the structural strength of the activated carbon plate.

[0024] The central electrode 34 is located in the internal reinforcement column in the middle of the activated carbon plate. When the power is turned on, the central electrode can generate an electric field around the activated carbon plate. For polar organic solvent molecules in the exhaust gas, the electric field can cause them to be oriented and more easily adsorbed on the surface of the activated carbon plate; for non-polar molecules, it can also induce them to produce polarization, thereby enhancing the adsorption effect with the activated carbon plate. In addition, the electric field can also change the charge distribution on the surface of the activated carbon plate, increase the adsorption sites, and further improve the adsorption efficiency of the activated carbon plate for organic solvents.

[0025] The interlayer electrode 35 is arranged inside the activated carbon plate, and its main function is to cooperate with the central electrode to optimize the electric field distribution inside the activated carbon plate. When the central electrode of the central axis is energized to generate an electric field, the interlayer electrode will be charged by electrostatic induction, thereby forming a more uniform and effective electric field inside the activated carbon plate. This helps to ensure that the electric field can penetrate all parts of the activated carbon plate, especially the pore area, so that the organic solvent molecules can be subjected to a relatively uniform electric field regardless of their position inside the activated carbon plate, and adsorption can be achieved more efficiently, further improving the adsorption effect of the entire adsorption tank on the organic solvent.

[0026] The activated carbon plate 32 is spiral-shaped, and the central electrode 34 is arranged on the central axis of the spiral activated carbon plate 32. The spiral activated carbon plate 32 and the central electrode 34 arranged on the central axis. The spiral design of the spiral activated carbon plate 32 means that when the exhaust gas flows through the activated carbon plate in the tank body, the flow path is no longer a simple straight line, but it moves in a circuitous way along the spiral channel. This greatly prolongs the contact time between the exhaust gas and the activated carbon plate, allowing the organic solvent molecules in the exhaust gas to have more opportunities to fully contact the surface and pores of the activated carbon plate, thereby increasing the probability of the organic solvent being adsorbed and enhancing the adsorption effect. In the limited tank space, the spiral structure can make more effective use of space. Compared with traditional flat-plate or other simple-shaped activated carbon plates, more activated carbon materials can be arranged, further increasing the effective area available for adsorption, which helps to improve the adsorption capacity of organic solvents.

[0027] The central electrode 34 is arranged on the central axis of the spiral activated carbon plate 32, and the electric field generated after power is turned on can radiate in a relatively uniform manner. Since the activated carbon plate is spirally wrapped around the electrode, this layout allows the electric field to penetrate the entire activated carbon plate more evenly, ensuring that each part can be affected by the electric field, so that the organic solvent molecules at different positions of the activated carbon plate can be subjected to a relatively consistent adsorption force enhancement effect, thereby improving the uniformity and overall efficiency of adsorption. The position of the central axis allows the electric field force to act effectively along the radial direction of the spiral activated carbon plate. For polar organic solvent molecules in the exhaust gas, they will move radially toward the surface of the activated carbon plate under the action of the electric field force, making them easier to be adsorbed; for non-polar molecules, they can also be better adsorbed by the polarization induced by the electric field, giving full play to the strengthening effect of the electric field on the adsorption process.

[0028] The interlayer electrode 35 is a metal sheet, which is spirally embedded in the activated carbon plate 32. The interlayer electrode 35 is made of metal sheet, which can effectively conduct current and ensure that the expected electric field effect can be generated after power is turned on or induced charging. At the same time, the relatively thin nature of the metal sheet makes it easier to bend into a shape that matches the spiral activated carbon plate, which is convenient for embedded installation inside the activated carbon plate. The interlayer electrode 35, which is spirally embedded in the activated carbon plate, further optimizes the electric field distribution inside the activated carbon plate by cooperating with the central electrode 34 of the central axis. When the central electrode is energized to generate an electric field, the interlayer electrode will be charged due to electrostatic induction, forming a more complex and detailed electric field network inside the activated carbon plate. This electric field network can penetrate into each fine pore area of ​​the activated carbon plate, so that the adsorption process of organic solvent molecules inside the activated carbon plate is subject to more comprehensive and accurate electric field regulation, further improving the adsorption efficiency.

[0029] Enhanced adsorption effect: The electric field formed by the interlayer electrode 35 can work in synergy with the electric field of the central electrode 34, providing a stronger adsorption driving force for organic solvent molecules in the exhaust gas, whether polar or non-polar. For example, polar molecules will be more firmly adsorbed on the activated carbon plate due to the combined effect of electric field forces from different directions; non-polar molecules can also be further enhanced under the influence of this synergistic electric field, thereby improving the adsorption capacity of the entire activated carbon plate for organic solvents.

[0030] The working principle is divided into the following stages: 1. Pretreatment stage: When the waste gas containing organic solvents enters the pretreatment mechanism 2, the pretreatment process begins. First, impurities such as particulate matter and dust in the waste gas are filtered out. The temperature and humidity of the waste gas are adjusted.

[0031] 2. Primary adsorption stage: The pre-treated waste gas enters the primary adsorption tank 3 through the pipeline. In the tank body 31 of the primary adsorption tank, the waste gas begins to contact the spiral activated carbon plate 32. The activated carbon plate 32 physically adsorbs the organic solvent molecules in the waste gas with its huge specific surface area and rich pore structure. When the waste gas flows in the spiral channel, the organic solvent molecules will be adsorbed in the pores of the activated carbon plate and separated from the waste gas. The waste gas is discharged from the pipeline into the chimney 10. At the same time, the central electrode 34 located in the activated carbon plate 32 and the interlayer electrode 35 inside the activated carbon plate play a role. The central electrode 34 is connected to the reversible power supply 37 at the bottom of the tank 31, and the power supply is connected to the electrode through the wiring tube 36 symmetrically arranged at the bottom. After power is turned on, the central electrode generates an electric field, and the interlayer electrode is charged by electrostatic induction, forming a complex and effective electric field environment inside the activated carbon plate. For polar organic solvent molecules in the exhaust gas, the electric field causes them to be oriented, move toward the surface of the activated carbon plate and be adsorbed; for non-polar molecules, the electric field induces their polarization, which enhances the adsorption effect with the activated carbon plate. In addition, the electric field also changes the charge distribution on the surface of the activated carbon plate, increases the adsorption sites, and further improves the adsorption efficiency.

[0032] 3. Desorption (when the activated carbon plate is saturated): When the activated carbon plate 32 is saturated with adsorption, the desorption process begins. First, the steam channel is opened, and the hot steam in the steam furnace 8 is passed into the primary adsorption tank 3. The hot steam has a high temperature and energy. For the solvent molecules adsorbed on the surface of the activated carbon, the heat carried by the hot steam can be transferred to these solvent molecules, so that they can obtain enough energy to overcome the adsorption force between them and the activated carbon. Hot steam can also increase the ambient temperature in the adsorption tank and increase the activity of the solvent molecules. At higher temperatures, the thermal motion of the solvent molecules is more intense, and their fluidity in the pores of the activated carbon is also greatly enhanced. This is conducive to the diffusion of solvent molecules from the surface of the activated carbon and the inside of the pores to the pore mouth, creating favorable conditions for subsequent desorption.

[0033] Then, the steam channel is closed and the pressure in the adsorption tank is reduced by the vacuum adsorption pump 9. The reduced pressure reduces the partial pressure of the solvent molecules in the gas phase, breaks the adsorption equilibrium between the solvent molecules on the activated carbon surface and the gas phase, and promotes the desorption of the solvent molecules from the activated carbon surface.

[0034] At the same time, the reversible power supply 37 adjusts the direction or intensity of the electric field. Changing the direction of the electric field can convert the electric field force originally used for adsorption into a force that pushes the solvent molecules away from the surface of the activated carbon, reduce the electric field intensity to weaken the adsorption bond between the solvent molecules and the activated carbon, and make it easier for the solvent molecules to detach from the surface of the activated carbon. Under the synergistic effect of decompression and electric field changes, the solvent molecules are accelerated to desorb from the surface of the activated carbon.

[0035] 4. Secondary adsorption stage (supplementary adsorption): When the solvent contains some low-polarity and small-molecule solvents, such as alkane solvents, cycloalkane solvents, etc., the outlet 3 of the primary adsorption tank is connected to the secondary adsorption tank 4. When the exhaust gas enters the secondary adsorption tank 4, it contacts the separation membrane. Due to the differences in size, polarity, solubility, etc. between special solvent molecules and other gas molecules, the separation membrane can allow these special solvent molecules to pass through or be intercepted first, thereby achieving separation from other exhaust gas components.

[0036] 5. Condensation and supergravity separation stage: The attached organic solvent vapor enters the front condensation mechanism 5 through the pipeline. In the condensation mechanism, the organic solvent vapor is cooled by a cooling medium such as cold water or refrigerant. The heat of the organic solvent vapor is taken away in a low-temperature environment, and a phase change occurs, from gas to liquid, to achieve preliminary separation. Subsequently, the liquid mixture enters the supergravity separation mechanism 6. The supergravity separation mechanism uses the supergravity field generated by high-speed rotation to achieve a more refined separation of different components in the liquid mixture under the action of centrifugal force. In a supergravity environment, impurities and residual water in the solvent will be separated into different areas due to differences in physical properties such as density, thereby effectively improving the purity of the recovered solvent.

[0037] 6. Solvent recovery stage: The high-purity organic solvent treated by the ultra-gravity separation mechanism 6 is transported to the solvent recovery tank 7 on the left for storage. The recovered organic solvent can be reused in industrial production and other links, realizing the recycling of organic solvents, reducing production costs and reducing the impact on the environment.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An organic solvent recovery system, characterized in that: The invention comprises a fixed frame (1), a pretreatment mechanism (2) is arranged on the right side of the fixed frame (1), a primary adsorption tank (3) is fixed at the lower end of the fixed frame (1), a secondary adsorption tank (4) is arranged on the left side of the primary adsorption tank (3), a condensation mechanism (5) is arranged at the front part of the fixed frame (1), a super gravity separation mechanism (6) is connected to the rear end of the condensation mechanism (5), a solvent recovery tank (7) is connected to the left side of the super gravity separation mechanism (6), a steam furnace (8) is arranged at the rear end of the fixed frame (1), and a vacuum adsorption pump (9) is arranged at the upper end of the fixed frame (1).

2. An organic solvent recovery system according to claim 1, characterized in that: The primary adsorption tank (3) comprises a tank body (31), an activated carbon plate (32) is fixed inside the tank body (31), an internal reinforcement column (33) is arranged in the middle of the activated carbon plate (32), a central electrode (34) is arranged in the middle of the internal reinforcement column (33), and an interlayer electrode (35) is arranged inside the activated carbon plate (32).

3. An organic solvent recovery system according to claim 2, characterized in that: The activated carbon plate (32) is spiral-shaped, and the central electrode (34) is arranged on the central axis of the spiral shape of the activated carbon plate (32).

4. An organic solvent recovery system according to claim 2, characterized in that: The interlayer electrode (35) is a metal sheet and is spirally embedded inside the activated carbon plate (32).

5. An organic solvent recovery system according to claim 2, characterized in that: The bottom of the tank body (31) is symmetrically provided with wiring tubes (36).

6. An organic solvent recovery system according to claim 2, characterized in that: A reversible power supply (37) is provided at the bottom of the tank body (31), and the positive and negative electrodes of the reversible power supply (37) are connected to the two ends of the central electrode (34).

7. An organic solvent recovery system according to claim 2, characterized in that: The number of the first-level adsorption tanks (3) is two.

8. A solvent recovery system according to claim 1, characterized in that: The vacuum adsorption pump (9) and the primary adsorption tank (3) are connected via a pipeline.

9. An organic solvent recovery system according to claim 1, characterized in that: The pretreatment mechanism (2) comprises a filter and a cooler.

10. The organic solvent recovery system according to claim 1, characterized in that: A chimney (10) is provided at the rear end of the fixing frame (1).

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