Organic waste gas solvent recovery device

Abstract

The utility model discloses organic waste gas solvent recovery device, and the adsorption unit includes a plurality of parallel adsorption module, and each adsorption module includes the filter equipment, heat exchanger and adsorption fan that connect gradually, and adsorption fan is connected with adsorption jar through the air inlet pipeline, and the desorption module includes the hot side of plate heat exchanger A, finned tube heat exchanger B, the hot side of plate heat exchanger C, finned tube heat exchanger D, demister that are connected gradually, and demister still links with the cold side of plate heat exchanger C, the cold side of plate heat exchanger A, desorption fan, finned tube heat exchanger E gradually, and the outlet of finned tube heat exchanger E is connected with each adsorption jar through desorption exhaust pipe, and the utility model discloses organic waste gas solvent recovery device, simple structure, flexible arrangement, saves design and construction period.

Description

Technical Field

[0001] This utility model belongs to the technical field of organic solvent recovery equipment, specifically relating to an organic waste gas solvent recovery device. Background Technology

[0002] Organic waste gas pollution has a wide range of sources, involves many industries, and is characterized by being flammable, explosive, toxic, harmful, and difficult to treat.

[0003] Currently, the mainstream technologies for treating organic waste gas include regenerative thermal oxidizer (RTO) and solvent recovery technology. The principle of RTO is to incinerate organic waste gas at high temperatures to produce carbon dioxide and water; a ceramic regenerative bed is then used to recover the heat from incineration, achieving energy-saving treatment. Solvent recovery technology, on the other hand, recovers organic solvents from the waste gas through adsorption-desorption, allowing the solvent to be utilized and the waste gas to be purified. Although solvent recovery processes are complex and require high standards in terms of personnel and safety, they offer high solvent recovery rates, good economic benefits, and are more environmentally friendly, aligning with the development direction of a circular economy.

[0004] Traditional solvent recovery devices, when used for waste gas adsorption and desorption treatment, require customized engineering designs based on different actual operating conditions, such as air volume and concentration. This results in long design and construction cycles, large overall layout and inflexibility, and the design cannot be reused, leading to inconsistent project quality. Conventional solvent recovery processes are simple but have high energy consumption. Utility Model Content

[0005] The purpose of this invention is to provide an organic waste gas solvent recovery device. By modularizing the adsorption and desorption processes, the desorption equipment is simplified, the layout is flexible, and the design and construction cycle is saved.

[0006] The technical solution adopted in this utility model is an organic waste gas solvent recovery device, including an adsorption unit and a desorption module; The adsorption unit includes several adsorption modules connected in parallel. Each adsorption module includes a filter device, a heat exchanger and an adsorption fan connected in sequence. The adsorption fan is connected to the adsorption tank through an air inlet pipe. The desorption module includes a plate heat exchanger A, a finned tube heat exchanger B, a plate heat exchanger C (hot side), a finned tube heat exchanger D, and a demister, all connected in sequence by pipes. The demister is also connected in sequence by pipes to the cold side of plate heat exchanger C, the cold side of plate heat exchanger A, a desorption fan, and a finned tube heat exchanger E. The outlet of finned tube heat exchanger E is connected to each adsorption tank through a desorption exhaust pipe, and the hot side of plate heat exchanger A is connected to each adsorption tank through a desorption inlet pipe.

[0007] The present invention is further characterized in that, The adsorption tank includes a horizontal tank body, which is filled with adsorption packing material. The bottom side of the tank body is provided with a pipe a, and the top of the tank body is provided with a pipe b, a pipe c and a pipe d respectively. Pipe port a is connected to the air inlet pipe via branch pipe a, and pipe port b is connected to the air outlet pipe via branch pipe b; pipe port c is connected to the desorption air inlet pipe via branch pipe c, and pipe port d is connected to the desorption exhaust pipe via branch pipe d.

[0008] Valve a is installed at branch a, valve b is installed at branch b, valve c is installed at branch c, and valve d is installed at branch d.

[0009] The branch pipe d of the adsorption tank is also connected to the inlet of the desorption blower via a pipeline.

[0010] A shut-off valve I is installed on the pipeline between the adsorption tank and the plate heat exchanger A, and a shut-off valve III is installed on the pipeline between the adsorption tank and the desorption fan.

[0011] A shut-off valve IV is installed at the inlet of the finned tube heat exchanger E, and a shut-off valve V is connected in parallel between the inlet end of the shut-off valve IV and the outlet end of the finned tube heat exchanger E.

[0012] Pressure regulating valve A and pressure regulating valve B are respectively installed on the pipeline between the desorption fan and the finned tube heat exchanger E.

[0013] The adsorption tank and the finned tube heat exchanger B are connected by a pipeline, and a shut-off valve II is installed on the pipeline.

[0014] The beneficial effects of this utility model are: 1) Streamlined design with shorter design and construction cycle. Based on the characteristics of organic solvent recovery process, adsorption units and desorption modules with larger processing air volume are designed. At the same time, the specifications and number of supporting valves and instruments are reduced. Each stage of desorption adopts a loop. Specific equipment has corresponding functions in multiple stages, making the whole device more streamlined and the operation process more stable. 2) Flexible layout: Depending on the air volume and concentration of the working conditions to be treated, only the number of adsorption modules needs to be increased. According to the desorption load, a set of desorption modules that meet the corresponding treatment capacity can be matched. The basic treatment unit design is the same, which greatly shortens the design and construction cycle. This device has lower site requirements and more flexible layout.

[0015] 3) Energy saving and efficiency improvement: Through the condensation stage, some of the heat and cold energy during operation can be recovered in the two heat recovery heat exchangers, reducing operating energy consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the organic waste gas solvent recovery device of this utility model; Figure 2 This is a utility model Figure 1 Rear view; Figure 3 This is a schematic diagram of the adsorption module in the organic waste gas solvent recovery device of this utility model; Figure 4 This is a schematic diagram of the desorption module in the organic waste gas solvent recovery device of this utility model; Figure 5 This is a schematic diagram of the desorption principle of the desorption module in the organic waste gas solvent recovery device of this utility model.

[0017] In the diagram, 1. Adsorption tank, 2. Adsorption module, 3. Desorption module, 4. Filtration device, 5. Heat exchanger, 6. Adsorption fan, 7. Plate heat exchanger A, 8. Finned tube heat exchanger B, 9. Plate heat exchanger C, 10. Finned tube heat exchanger D, 11. Demister, 12. Desorption fan, 13. Finned tube heat exchanger E, 14. Horizontal tank, 15. Port a, 16. Port b, 17. Port c, 18. Port d, 19. Pressure regulating valve A, 20. Pressure regulating valve B, 21. Exhaust gas inlet, 22. Air inlet duct, 23. Shut-off valve I, 24. Shut-off valve II, 25. Shut-off valve III, 26. Shut-off valve IV, 27. Shut-off valve V, 28. Shut-off valve VI, 29. Shut-off valve VII. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Example 1 The organic waste gas solvent recovery device of this utility model has the following structure. Figure 1 , Figure 2 and Figure 3 As shown, the system includes an adsorption unit and a desorption module 3. The adsorption unit includes several adsorption modules 2 connected in parallel. Each adsorption module 2 includes a filter device 4, a heat exchanger 5, and an adsorption fan 6 connected in sequence. The adsorption fan 6 is connected to the adsorption tank 1 through an air inlet pipe 22.

[0020] The processing capacity of a single adsorption module 2 is fixed, and multiple adsorption modules 2 connected in parallel can form adsorption units with different processing capacities.

[0021] The adsorption unit contains at least n+1 adsorption tanks, of which n adsorption tanks are in the adsorption stage and 1 adsorption tank is in the packing desorption and regeneration stage.

[0022] like Figure 1 , Figure 2 and Figure 4 As shown, the inlet and outlet of the desorption module 3 are connected to the adsorption tank 1. From the outlet of the branch pipe d of the adsorption tank 1, the hot side of the plate heat exchanger A7, the hot side of the finned tube heat exchanger B8, the hot side of the plate heat exchanger C9, the finned tube heat exchanger D10, and the demister 11 are connected in sequence through pipes. The demister 11 is also connected in sequence through pipes to the cold side of the plate heat exchanger C9, the cold side of the plate heat exchanger A7, the desorption fan 12, and the finned tube heat exchanger E13. The outlet of the finned tube heat exchanger E13 is connected to each adsorption tank 1 through the desorption exhaust pipe. The hot side of the plate heat exchanger A7 is connected to each adsorption tank 1 through the desorption inlet pipe.

[0023] Example 2 Based on Example 1, such as Figure 3 As shown, the adsorption tank 1 includes a horizontal tank body 14, which is filled with adsorption packing material, which is activated carbon granules. The amount of activated carbon filling material is related to the size of the adsorption tank and the operating conditions of the organic waste gas to be treated.

[0024] The tank has a pipe opening a15 on one side of its bottom, and pipe openings b16, c17, and d18 on its top. A manhole is located on the top of the tank, and handholes are located on the sides for easy maintenance.

[0025] Pipe port a15 is connected to air inlet pipe 22 via branch pipe a, pipe port b16 is connected to air outlet pipe via branch pipe b; pipe port c17 is connected to desorption air inlet pipe via branch pipe c, and pipe port d18 is connected to desorption exhaust pipe via branch pipe d.

[0026] Example 3 Based on Example 2, valve a is installed at branch pipe a, valve b is installed at branch pipe b, valve c is installed at branch pipe c, and valve d is installed at branch pipe d. A manhole is provided at the top of the tank, and a handhole is provided on the side.

[0027] The organic waste gas is treated by adsorption unit. The organic solvent in the organic waste gas is adsorbed in the adsorption module. The specific process is as follows: close valves c and d of the adsorption tank of the adsorption unit, open valves a and b, and the waste gas enters through the waste gas inlet 21, passes through the filter device 4, is cooled by the heat exchanger 5, and is then drawn into the adsorption tank 1 by the adsorption fan 6 for adsorption treatment.

[0028] Example 4 Based on Example 3, such as Figure 5 As shown, a shut-off valve I23 is installed on the pipeline between adsorption tank 1 and plate heat exchanger A7. Branch pipe d of adsorption tank 1 is also connected to the inlet of desorption fan 12 via a pipeline. A shut-off valve III25 is installed on the pipeline between adsorption tank 1 and desorption fan 12.

[0029] A shut-off valve Ⅳ26 is installed at the inlet of the finned tube heat exchanger E13, and a shut-off valve Ⅴ27 is connected in parallel between the inlet end of the shut-off valve Ⅳ26 and the outlet end of the finned tube heat exchanger E13.

[0030] Example 5 Based on Example 4, such as Figure 5 As shown, pressure regulating valve A19 and pressure regulating valve B20 are respectively installed on the pipeline between the desorption fan 12 and the finned tube heat exchanger E13. Pressure regulating valve A is used to regulate the intake air volume, and pressure regulating valve B is used to regulate the exhaust air volume.

[0031] Example 6 Based on Example 5, the adsorption tank 1 and the finned tube heat exchanger B8 are connected by a pipe, and a shut-off valve II24 is installed on the pipe.

[0032] Branch pipe c of the adsorption tank is connected to shut-off valve I23, shut-off valve II24, and shut-off valve III25. Shut-off valve I23 is connected to port a of plate heat exchanger A7. Plate heat exchanger A7 has four ports: hot fluid inlet a, hot fluid outlet b, cold fluid inlet c, and cold fluid outlet d. Port b of plate heat exchanger A is connected to the hot side of finned tube heat exchanger B8. The outlet of finned tube heat exchanger B8 is connected to port a of plate heat exchanger C9. Plate heat exchanger C9 has four ports: hot fluid inlet a, hot fluid outlet b, cold fluid inlet c, and cold fluid outlet d. Port b of plate heat exchanger C9 is connected to the hot side inlet of finned tube heat exchanger D10, and its outlet is connected to port c of plate heat exchanger C9. Port d of plate heat exchanger C9 is connected to port c of plate heat exchanger A7.

[0033] The d port of plate heat exchanger A7 is connected to desorption fan 12 through a pipe. Shut-off valve II 24 is located between branch pipe c of adsorption tank 1 and finned tube heat exchanger B8. Shut-off valve III 25 is located between branch pipe c of adsorption tank 1 and desorption fan 12.

[0034] The organic solvent adsorbed in the adsorption module 2 is desorbed using the desorption module 3. The specific process is as follows: valves a and b are closed, valves c and d are opened, and nitrogen gas heated to 180~230℃ enters the adsorption tank a from the branch pipe c, desorbing the organic solvent adsorbed on the activated carbon in the adsorption tank a. The solvent is then discharged from the branch pipe d and enters the desorption module for further desorption.

[0035] The desorption circuit includes: the solvent in the bed of adsorption tank 1 is gradually desorbed by nitrogen gas at 180~230℃; the gas phase containing organic solvent is sequentially cooled in four stages by the hot side of plate heat exchanger A7, the hot side of finned tube heat exchanger B8, the hot side of plate heat exchanger C9, and finned tube heat exchanger D10; and the desorbed gas phase solvent is condensed into liquid organic solvent at demister 11 and collected from the bottom port of demister 11. Demister 11 is connected to wastewater pipe and solvent pipe. A shut-off valve VI28 is installed on the wastewater pipe, and a shut-off valve VII29 is installed on the solvent pipe.

[0036] This utility model's organic waste gas solvent recovery device features a simplified design, resulting in a shorter design and construction cycle. Based on the characteristics of the organic solvent recovery process, it designs an adsorption unit and desorption module with a larger processing capacity, while reducing the specifications and quantity of supporting valves and instruments. Each stage of desorption uses a single loop, and specific equipment has corresponding functions in multiple stages, making the entire device more streamlined and the operation process more stable.

[0037] The organic waste gas solvent recovery device of this utility model has the following specific recovery method: Step 1: Adsorption unit is used to adsorb organic waste gas to adsorb organic solvents in organic waste gas into adsorption module 2. The adsorption unit includes several adsorption modules 2 connected in parallel. Each adsorption module 2 includes a filter device 4, a heat exchanger 5, and an adsorption fan 6 connected in sequence. The adsorption fan 6 is connected to the adsorption tank 1 through an air inlet pipe 22.

[0038] like Figure 3 As shown, the exhaust gas enters the filter device 4 from the upper exhaust gas inlet 21, and the filter device 4 is installed horizontally.

[0039] like Figure 3 As shown, the adsorption tank 1 includes a horizontal tank body 14, which is filled with adsorption packing material, which is activated carbon. A pipe port a15 is located on one side of the bottom of the tank body, and pipe ports b16, c17, and d18 are located on the top. Pipe port a15 is connected to the air inlet pipe 22 via branch pipe a, and pipe port b16 is connected to the air outlet pipe via branch pipe b. Pipe port c17 is connected to the desorption air inlet pipe via branch pipe c, and pipe port d18 is connected to the desorption exhaust pipe via branch pipe d.

[0040] Valve a is located at branch pipe a, valve b is located at branch pipe b, valve c is located at branch pipe c, and valve d is located at branch pipe d. A manhole is located at the top of the tank, and a handhole is located on the side.

[0041] Since each tank branch pipe a is equipped with a valve between itself and the air inlet pipe, this invention allows for the activation or deactivation of each adsorption tank based on the actual volume of waste gas to be treated, providing greater flexibility.

[0042] The working process of adsorption module 2 is as follows: the waste gas to be treated first passes through the filter device 4 to remove large dust particles, and then passes through the heat exchanger 5 to cool it. Under the action of the adsorption fan 6, it enters the adsorption tank 1 through the air inlet pipe 22. The activated carbon filled in each adsorption tank 1 adsorbs the organic matter in the waste gas. After being adsorbed and purified by the adsorption tank, the waste gas that meets the standards is discharged through the branch pipe b.

[0043] The number of adsorption modules 2 in operation can be flexibly set according to the amount of gas to be treated. This device is illustrated with four adsorption tanks as an example. Generally, during operation, three adsorption tanks are in the adsorption stage and one adsorption tank is in the desorption stage. In actual application, the number of adsorption tanks in the adsorption stage can be adjusted according to the actual amount of waste gas.

[0044] During the adsorption stage, valves a and b at branch a are both open, while valves c and d at branch c are both closed.

[0045] Step 2: Desorption module 3 is used to desorb the organic solvent adsorbed in the adsorption module, thereby removing the organic solvent from the adsorption module. The specific process of step 2 is as follows: close valves a and b, open valves c and d, and nitrogen gas heated to 180~230℃ enters adsorption tank 1 from branch pipe c, desorbing the organic solvent adsorbed on the activated carbon in adsorption tank 1, which is then discharged from branch pipe d and enters desorption module 3 for desorption treatment.

[0046] like Figure 1 , Figure 2 and Figure 4 As shown, the desorption module 3 includes a plate heat exchanger A7, a finned tube heat exchanger B8, a plate heat exchanger C9, a finned tube heat exchanger D10, a demister 11, a desorption fan 12, a finned tube heat exchanger E13, a pressure regulating valve A19, a pressure regulating valve B20, a shut-off valve I 23, a shut-off valve II 24, a shut-off valve III 25, a shut-off valve IV 26, a shut-off valve V 27, a shut-off valve VI 28, and a shut-off valve VII 29.

[0047] The desorption circuit includes the above-mentioned equipment, valves, and equipment and branch pipes in the adsorption unit. The desorption module can realize multiple processes by opening and closing the shut-off valve: desorption and water removal, desorption and condensation, and bed cooling.

[0048] The desorption and dehydration process consists of two stages. The first stage involves heating the bed with nitrogen gas. Initially, the gas temperature exiting the bed remains relatively low, resulting in minimal removal of moisture and solvent. The nitrogen gas is then reheated to a high temperature and circulated into the adsorption tank for solvent circulation. The second stage involves removing moisture from the activated carbon surface. As the bed outlet temperature rises, moisture and a small amount of solvent are removed from the activated carbon, and the moisture is condensed and collected.

[0049] The specific operation process of the previous stage is as follows: Figure 5 As shown, the desorption fan 12 is turned on, and shut-off valves III 25 and IV 26 are opened, while all other shut-off valves are closed. Nitrogen gas passes through the finned tube heat exchanger E13, which is heated to 180~230℃ using heat transfer oil. The heated nitrogen gas is then sent into the adsorption tank 1, where the solvent in the bed is gradually desorbed by the high-temperature nitrogen gas and discharged from the branch pipe d. It is then sent back into the finned tube heat exchanger E13 by the desorption fan 12, and the hot nitrogen gas continues to heat the bed.

[0050] In the second stage, when the bed outlet temperature exceeds the set value, a considerable amount of water vapor and a small amount of VOC organic solvent are removed. Shut-off valve III25 is closed, shut-off valve I23 is opened, shut-off valves II24 and V27 remain closed, and shut-off valve IV26 remains open. The high-temperature gas phase undergoes three stages of cooling sequentially with the hot side of plate heat exchanger A7, finned tube heat exchanger B8, and plate heat exchanger C9. After finned tube heat exchanger D10, the water in the desorbed high-temperature nitrogen condenses into a liquid phase, which is collected from the bottom port of demister 11 and sent to the next process. The small amount of uncondensed gaseous solvent and all the nitrogen are preheated by the cold side of plate heat exchanger C9 and plate heat exchanger A7, and then sent by desorption fan 12 to finned tube heat exchanger E13 for heating to the required temperature. This process repeats the entire desorption and dehydration circuit.

[0051] After the desorption and dehydration process is completed, as the bed temperature continues to rise, the desorption and condensation stage begins. The operation of the loop valves in the desorption and condensation stage is consistent with that in the second stage of the desorption and dehydration process. The cold source in the finned tube heat exchanger D10 in the condensation stage is set to a temperature of approximately -10 to -15°C (adjusted according to the type of solvent). The gaseous solvent in the desorbed high-temperature nitrogen gas condenses into a liquid phase, which is collected from the bottom port of the demister 11 and sent to the next process. The gaseous phase (the gaseous phase is the gaseous VOC organic solvent; the desorbed high-temperature nitrogen gas contains a high concentration of VOC organic solvent, and condensation only turns this part of the solvent into a liquid state for export; here, "gaseous phase" refers to a small amount of residual gaseous solvent and all the nitrogen gas after condensation) is preheated by the cold side of the plate heat exchanger C9 and the cold side of the plate heat exchanger A7, and then sent by the desorption fan 12 to the finned tube heat exchanger E13 to be heated to the required temperature. This sequence is used to cycle the entire desorption and condensation loop.

[0052] After the adsorption tank 1 bed has completed desorption and condensation, it needs to be cooled before it can be put back into the adsorption process of waste gas. This circuit can cool nitrogen gas and then introduce it into the bed for cooling.

[0053] The bed cooling circuit mainly includes finned tube heat exchanger B, plate heat exchanger C, finned tube heat exchanger D, desorption fan, and adsorption tank. For example... Figure 5 As shown, the specific operation process of the bed cooling circuit is as follows: Open shut-off valves II24 and V27, and close shut-off valves I23, III25, and IV26. After passing through the cooling bed, the heated nitrogen gas exits from the adsorption tank 1 and first passes through the finned tube heat exchanger B8, where it is cooled to a low temperature (40~50℃). Then, it passes through the plate heat exchanger C9 (35-45℃) and re-enters the finned tube heat exchanger D10, where it is further cooled (5~20℃). Then, it passes through the demister 11 to the cold side of the plate heat exchanger C9 for heat exchange (10-25℃), and then passes through the plate heat exchanger A7 before being sent back to the adsorption tank 1 by the desorption fan 12.

[0054] Since the shut-off valve I23 is in the closed state, no heat exchange occurs inside the plate heat exchanger A7.

[0055] The low-temperature cold source inside the D10 tube of the finned tube heat exchanger is heated to ensure that the cold source temperature does not drop too low during the dehydration stage of the next desorption cycle, thus avoiding the risk of condensate freezing. Low-temperature nitrogen is used to cool the bed in the adsorption tank. This process is repeated until the bed temperature in the adsorption tank reaches the set value (below 55~60℃).

[0056] In the processes of desorption and dehydration, desorption and condensation, and bed cooling, pressure regulating valve A19 adjusts its size according to the pressure of the circuit. When the pressure of the circuit is lower than the set value, nitrogen is added to the circuit. Pressure regulating valve B20 adjusts its size according to the pressure of the circuit. When the pressure of the circuit exceeds the set value, gas is released to reduce the pressure.

[0057] For the desorption and regeneration of a single packed container, desorption condensation plus bed cooling constitutes a complete desorption and regeneration process. Therefore, in terms of control, it is necessary to ensure that packed containers in different groups undergo desorption condensation and bed cooling operations sequentially.

[0058] The advantages of this organic waste gas solvent recovery device are: The overall structure is simple and the layout is flexible. Depending on the air volume and concentration of the working conditions to be treated, only the number of adsorption modules needs to be increased. According to the desorption load, a set of desorption modules that meet the corresponding treatment capacity is matched. The design of the basic treatment unit is the same, which greatly shortens the design and construction cycle. This device has lower site requirements and is more flexible in layout.

[0059] The two plate heat exchangers in the desorption module are gas-to-gas plate heat exchangers, both of which are heat recovery heat exchangers. They can recover heat carried away from the bed during the two processes with the highest heat consumption: desorption / water removal and deheating. They also utilize the heat and cold energy before and after condensation to preheat and precool the circulating nitrogen. The heat from bed cooling is recovered during desorption / water removal and deheating, while simultaneously reducing the need for external input of heat and cold energy, thus achieving energy savings. Through the condensation stage, some of the heat and cold energy generated during operation can be recovered in the two heat recovery heat exchangers, reducing operating energy consumption and improving energy efficiency.

Claims

1. An organic waste gas solvent recovery device, characterized in that, Includes an adsorption unit and a desorption module (3); The adsorption unit includes several adsorption modules (2) connected in parallel. Each adsorption module (2) includes a filter device (4), a heat exchanger (5) and an adsorption fan (6) connected in sequence. The adsorption fan (6) is connected to an adsorption tank (1) through an air inlet pipe (22). The desorption module (3) includes the hot side of plate heat exchanger A (7), finned tube heat exchanger B (8), plate heat exchanger C (9), finned tube heat exchanger D (10), and demister (11) connected in sequence by pipes. The demister (11) is also connected in sequence by pipes to the cold side of plate heat exchanger C (9), the cold side of plate heat exchanger A (7), desorption fan (12), and finned tube heat exchanger E (13). The outlet of finned tube heat exchanger E (13) is connected to each adsorption tank (1) through a desorption exhaust pipe. The hot side of plate heat exchanger A (7) is connected to each adsorption tank (1) through a desorption inlet pipe.

2. The organic waste gas solvent recovery device according to claim 1, characterized in that, The adsorption tank (1) includes a horizontal tank body (14), which is filled with adsorption packing material. A pipe port a (15) is provided on one side of the bottom of the tank body, and a pipe port b (16), a pipe port c (17) and a pipe port d (18) are provided on the top of the tank body respectively. Pipe a (15) is connected to the air inlet pipe (22) through branch pipe a, and pipe b (16) is connected to the air outlet pipe through branch pipe b; pipe c (17) is connected to the desorption air inlet pipe through branch pipe c, and pipe d (18) is connected to the desorption exhaust pipe through branch pipe d.

3. The organic exhaust gas solvent recovery apparatus according to claim 2, characterized by Valve a is installed at branch a, valve b is installed at branch b, valve c is installed at branch c, and valve d is installed at branch d.

4. The organic waste gas solvent recovery device according to claim 2, characterized in that, The branch pipe d of the adsorption tank (1) is also connected to the inlet of the desorption fan (12) through a pipeline.

5. The organic waste gas solvent recovery device according to claim 4, characterized in that, A shut-off valve I (23) is installed on the pipeline between the adsorption tank (1) and the plate heat exchanger A (7), and a shut-off valve III (25) is installed on the pipeline between the adsorption tank (1) and the desorption fan (12).

6. The organic waste gas solvent recovery device according to claim 1 or 2, characterized in that, A shut-off valve Ⅳ (26) is provided at the inlet of the finned tube heat exchanger E (13), and a shut-off valve Ⅴ (27) is connected in parallel between the inlet end of the shut-off valve Ⅳ (26) and the outlet end of the finned tube heat exchanger E (13).

7. The organic waste gas solvent recovery device according to claim 1 or 2, characterized in that, Pressure regulating valve A (19) and pressure regulating valve B (20) are respectively installed on the pipeline between the desorption fan (12) and the finned tube heat exchanger E (13).

8. The organic waste gas solvent recovery device according to claim 1, characterized in that, The adsorption tank (1) is connected to the finned tube heat exchanger B (8) by a pipe, and a shut-off valve II (24) is installed on the pipe.

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