Tail gas spraying and adsorbing device for NMP recovery

Abstract

The present application relates to the technical field of flue gas treatment, and discloses a tail gas spraying and adsorbing device for NMP recovery, which comprises an adsorbing tank, a gas outlet pipe is communicated with the top end of the adsorbing tank, a liquid discharge pipe is communicated with the bottom end of the adsorbing tank, and an atomizing nozzle, a fixed disc, a filler layer and a gas inlet pipe are sequentially arranged in the adsorbing tank from top to bottom. When high-temperature tail gas is conveyed from the gas inlet pipe, the impact kinetic energy of the airflow drives the rotation of the turbine, and the rotation of the turbine drives the synchronous rotation of the rotating disc. The rotation of the rotating disc changes the direction of the multiple equally-spaced baffle plates, and the spraying liquid is uniformly distributed along the channels between adjacent two baffle plates. After the rotating disc rotates, the distribution channel and the distribution position are rotated, so that the landing point of the spraying liquid on the filler layer is constantly changed. The problem that the spraying distribution position is fixed, long-term operation produces channeling and wall flow, and the distribution dead angle and part of the filler cannot fully contact with the spraying liquid, resulting in the decrease of the absorption efficiency, is avoided.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, and specifically to a tail gas spray adsorption device for NMP recovery. Background Technology

[0002] Generally, the NMP recovery tail gas spray adsorption device is a type of equipment used in lithium-ion battery production to treat NMP-containing waste gas. In the lithium-ion battery production process, NMP is widely used as a solvent for the binder PVDF. In the coating process, NMP is discharged from the coating equipment in the form of high-temperature waste gas. It is necessary to absorb and recover NMP vapor in the waste gas and purify the tail gas for emission in order to recover the solvent, reduce production costs, and at the same time avoid the emission of organic waste gas and environmental pollution.

[0003] In the spray adsorption process, spray absorption is a crucial step that directly affects the NMP recovery rate and the purification effect of the exhaust gas. The spray liquid is atomized by the spray nozzle to form fine droplets. These fine droplets have the advantage of a large specific surface area, allowing them to fully contact the rising exhaust gas and efficiently absorb the NMP vapor in the exhaust gas. However, in actual operation, due to the small particle size of the fine droplets, they are easily carried away by the rising airflow. Many droplets are carried up by the airflow before they even fall onto the packing layer, forming mist entrainment, which increases the burden on the demister. The entrained droplets may also enter the adsorption... The layer causes the adsorbent to become damp and ineffective. In addition, the fine droplets are easily deflected by the rising airflow and flow down the wall. When they fall onto the packing layer, their distribution is uneven, causing the spray liquid to concentrate in local areas, forming channel flow and wall flow. Some packing cannot fully contact the spray liquid, creating absorption dead zones. Moreover, the exhaust gas discharged from the coating process is high-temperature exhaust gas. The high temperature causes the gas volume to expand and rise faster, further aggravating the problem of mist entrainment and uneven distribution of spray liquid. Ultimately, the NMP vapor in the exhaust gas cannot be fully absorbed, resulting in a decrease in recovery rate and exhaust gas emissions that do not meet standards. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a tail gas spray adsorption device for NMP recovery, thereby solving the technical problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A tail gas spray adsorption device for NMP recovery includes:

[0007] An adsorption tank is provided, with an outlet pipe connected to the top and a drain pipe connected to the bottom. Inside the adsorption tank, from top to bottom, are arranged an atomizing nozzle, a fixed plate, a packing layer, and an air inlet pipe. The atomizing nozzle is fixedly installed inside the adsorption tank, with its air inlet end penetrating the tank. A three-way valve is connected to the air inlet end of the atomizing nozzle, with its two ports connected to a water inlet pipe and a circulation pipe, respectively. The water inlet pipe is connected to an external water supply assembly, and the circulation pipe is connected to the bottom of the adsorption tank. The fixed plate and the packing layer are both fixedly installed on the inner wall of the adsorption tank. A turntable is rotatably installed inside the fixed plate, and multiple equally spaced baffles are fixedly installed on the inner wall of the turntable. The air inlet pipe penetrates the bottom of the adsorption tank and is coaxial with the tank. The horizontal height of the outlet end of the air inlet pipe is higher than the liquid level at the bottom of the adsorption tank.

[0008] A disc is fixedly installed at the top of the intake pipe with a gap between them. A rotating rod is rotatably installed inside the disc, with its bottom end extending into the intake pipe. A connecting component is provided at the top of the rotating rod, and a turbine is coaxially fixedly installed at the bottom of the rotating rod. The turbine is rotatably installed inside the intake pipe. A rotating frame is rotatably installed inside the packing layer, with its top end fixedly connected to the bottom of the disc and its bottom end connected to the connecting component.

[0009] As a further aspect of the present invention, a defoaming screen is fixedly installed inside the air outlet pipe.

[0010] As a further aspect of the present invention: the diameter of the disc increases first and then decreases upward along the central axis of the intake pipe, and the maximum diameter of the disc is greater than the diameter of the intake pipe.

[0011] As a further aspect of the present invention: a conical surface is provided at the top of the fixed disk, the diameter of the conical surface increases upward along the central axis of the fixed disk, the top of the conical surface abuts against the inner wall of the adsorption tank, and the bottom of the conical surface abuts against the top of the turntable.

[0012] As a further aspect of the present invention: a first cooling pipe is provided at the connection between the atomizing nozzle and the three-way valve, and the first cooling pipe cools the liquid input into the atomizing nozzle.

[0013] As a further aspect of the present invention: a second cooling pipe is provided on the air intake pipe, and the second cooling pipe cools the gas flowing in the air intake pipe.

[0014] As a further embodiment of the present invention: the connecting assembly includes a sleeve, a rotating ring, a straight plate, a long groove, and a short groove. The bottom end of the rotating frame is located above the top end of the rotating rod. The short groove is opened at the bottom end of the rotating frame, and the long groove is opened at the top end of the rotating rod. The rotating ring is slidably sleeved on the outer circular surface of the top end of the rotating rod. The straight plate is fixedly installed on the inner wall of the rotating ring, and the bottom end of the straight plate is slidably connected to the long groove. A bracket is fixedly installed on the inner wall of the adsorption tank. A lifting bend is slidably installed on the bracket. The lifting bend is driven to rise and fall by a driving assembly. The sleeve is fixedly installed at the top end of the lifting bend. The rotating ring is rotatably installed inside the sleeve. When the driving assembly drives the lifting bend to rise, it drives the sleeve, the rotating ring, and the straight plate to rise synchronously, so that the top end of the straight plate slides into the short groove.

[0015] As a further embodiment of the present invention: the driving assembly includes an electric cylinder, a limiting plate, and a float. The electric cylinder is fixedly installed at the bottom of the adsorption tank, and the movable end of the electric cylinder is located inside the adsorption tank. The limiting plate is fixedly installed at the movable end of the electric cylinder, and one end of the limiting plate is sleeved on the lifting bend. A fixing ring is fixedly installed on the outer circumference of the lifting bend, and the bottom of the limiting plate abuts against the fixing ring. The float is fixedly installed at the bottom end of the lifting bend.

[0016] The beneficial effects of this invention are:

[0017] 1. In this invention, when high-temperature exhaust gas is transported from the intake pipe, the impact kinetic energy of the airflow drives the turbine to rotate, the turbine drives the rotating rod to rotate, and the rotating rod drives the rotating frame and the turntable to rotate synchronously through the connecting component. The rotation of the turntable changes the direction of multiple equally spaced baffles. The spray liquid was originally evenly distributed along the channel between two adjacent baffles. After the turntable rotates, the distribution channel and the distribution position rotate accordingly, so that the landing point of the spray liquid on the packing layer changes continuously, realizing the dynamic and uniform distribution of the spray liquid on the cross section of the packing layer, improving the utilization rate of the packing layer and the NMP absorption efficiency, and avoiding the problems of fixed spray liquid distribution position, channel flow and dead corners in long-term operation, and the inability of some packing to fully contact the spray liquid, resulting in a decrease in absorption efficiency.

[0018] 2. In this invention, when the exhaust gas is ejected from the inlet pipe and rises, it is blocked by the disc and dispersed along the inclined conical surface at the bottom of the disc before rising. This avoids the airflow from concentrating and impacting the local area of ​​the packing layer. At the same time, when the exhaust gas passes through the packing layer and rises through the channel between two adjacent baffles, the rebound of the inclined surface of the baffle slows down the rising speed. In addition, the first cooling pipe cools the spray liquid, and the second cooling pipe cools the exhaust gas flowing in the inlet pipe, causing the gas volume to shrink and the rising gas velocity to be further reduced. Combined with the demister screen set in the outlet pipe, water droplets are intercepted, avoiding the problem that fine mist droplets with too small a particle size are easily entrained by the rising airflow, the high temperature exhaust gas causes the gas to expand and rise faster, which aggravates the mist entrainment, and the water droplets entering the subsequent stages, leading to adsorption failure.

[0019] 3. In this invention, when the top of the straight plate is far from the short groove, the turbine drives the rotating rod to rotate, and the straight plate can only rotate idly in the long groove. The rotating frame and the turntable remain stationary, maintaining stable spraying and distribution. The electric cylinder drives the limiting plate to rise, and under the buoyancy of the float, the lifting bend drives the sleeve and the rotating ring to rise synchronously. If the long groove is not aligned with the short groove, the top of the straight plate abuts against the bottom of the rotating frame. The buoyancy of the float continuously provides upward thrust. Once the rotating rod rotates to the moment when the long groove and the short groove are aligned, the straight plate automatically inserts into the short groove, driving the rotating frame and the turntable to rotate, realizing the intermittent rotation of the turntable. This can periodically change the direction of the baffle plate to redistribute the liquid and eliminate dead angles in the liquid distribution, while avoiding the problem of messy atomized water droplets and uneven liquid distribution caused by continuous rotation of the turntable. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a cross-sectional structural schematic diagram of the adsorption tank in this invention;

[0023] Figure 3 In this invention Figure 2 A schematic diagram of the structure from head-up view;

[0024] Figure 4 This is a cross-sectional structural schematic diagram of the intake pipe in this invention;

[0025] Figure 5 In this invention Figure 4 Enlarged structural diagram of section A;

[0026] Figure 6 In this invention Figure 4 Enlarged structural diagram of section B;

[0027] Figure 7 This is a schematic diagram of the sleeve structure in this invention;

[0028] Figure 8 This is a schematic diagram of the long and short grooves in this invention.

[0029] In the diagram: 1. Adsorption tank; 101. Support; 102. Drain pipe; 2. Atomizing nozzle; 3. First cooling pipe; 4. Three-way valve; 5. Water inlet pipe; 6. Circulation pipe; 7. Air outlet pipe; 8. Defoaming screen; 9. Packing layer; 10. Fixed plate; 1001. Conical surface; 11. Turntable; 12. Baffle plate; 13. Air inlet pipe; 14. Disc; 15. Rotating rod; 16. Turbine; 17. Second cooling pipe; 18. Rotating frame; 19. Electric cylinder; 20. Limiting plate; 21. Lifting bend; 2101. Fixed ring; 22. Float; 23. Sleeve; 24. Rotating ring; 25. Straight plate; 26. Long trough; 27. Short trough. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1-8 As shown, the present invention is a tail gas spray adsorption device for NMP recovery, comprising:

[0032] An adsorption tank 1 has an air outlet pipe 7 connected to its top and a drain pipe 102 connected to its bottom. Inside the adsorption tank 1, from top to bottom, are arranged an atomizing nozzle 2, a fixed plate 10, a packing layer 9, and an air inlet pipe 13. The atomizing nozzle 2 is fixedly installed inside the adsorption tank 1, and its air inlet end penetrates through the adsorption tank 1. A three-way valve 4 is connected to the air inlet end of the atomizing nozzle 2. The two ports of the three-way valve 4 are respectively connected to a water inlet pipe 5 and a circulation pipe 6. The water inlet pipe 5 is connected to the external water supply assembly, the circulation pipe 6 is connected to the bottom of the adsorption tank 1, the fixed plate 10 and the packing layer 9 are both fixedly installed on the inner wall of the adsorption tank 1, the fixed plate 10 is rotatably installed with a turntable 11, and the inner wall of the turntable 11 is fixedly installed with multiple baffles 12 arranged at equal intervals, the air inlet pipe 13 is arranged through the bottom of the adsorption tank 1, and the air inlet pipe 13 is coaxial with the adsorption tank 1, and the horizontal height of the air outlet end of the air inlet pipe 13 is higher than the liquid surface at the bottom of the adsorption tank 1;

[0033] A disc 14 is fixedly installed at the top of the intake pipe 13 with a gap between them. A rotating rod 15 is rotatably installed inside the disc 14. The bottom end of the rotating rod 15 extends into the intake pipe 13. A connecting component is provided at the top end of the rotating rod 15, and a turbine 16 is coaxially fixedly installed at the bottom end of the rotating rod 15. The turbine 16 is rotatably installed inside the intake pipe 13. A rotating frame 18 is rotatably installed inside the filler layer 9. The top end of the rotating frame 18 is fixedly connected to the bottom of the turntable 11, and the bottom end of the rotating frame 18 is connected to the connecting component.

[0034] In one embodiment, a water pump is installed on the circulation pipe 6.

[0035] The working principle of this invention is as follows: First, NMP exhaust gas is transported to the adsorption tank 1 through the intake pipe 13. As the high-temperature exhaust gas rises within the adsorption tank 1, it is blocked by the disc 14, preventing it from directly impacting the packing layer 9. Instead, it disperses outwards along the edge of the disc 14. Simultaneously, the external water supply assembly delivers water to the three-way valve 4 and the atomizing nozzle 2 through the water inlet pipe 5. The water is atomized and sprayed through the atomizing nozzle 2. The atomized water droplets fall under gravity and land on the baffle plate 12. Because the baffle plate 12 is bent, the atomized water droplets converge on it to form small water droplets, which then disperse outwards along the baffle plate 12. The gas slides down the inclined surface of the baffle 12, then falls through the channel between two adjacent baffles 12 onto the packing layer 9 below. As the high-temperature exhaust gas rises through the packing layer 9, it comes into full contact with the sprayed water adhering to the packing layer 9. The NMP vapor dissolves in the water, completing the absorption. The absorbed water precipitates from the packing layer 9 and falls to the bottom of the adsorption tank 1, where it collects. During the fall, the disc 14 blocks water droplets, preventing water from falling into the inlet pipe 13. The collected solution is circulated by the water pump on the circulation pipe 6 to the three-way valve 4 and the atomizing nozzle 2 for re-spraying. After multiple cycles of absorption, the gas is adsorbed. When the solution concentration at the bottom of tank 1 reaches the set value, it is discharged through the drain pipe 102, and then the NMP in the solution is precipitated and recovered. The high-temperature exhaust gas continues to rise after passing through the packing layer 9. During its ascent, it needs to pass through the channel between two adjacent baffles 12. The rebound of the inclined surfaces of the two baffles 12 slows down the rising speed of the exhaust gas, solving the problem in the prior art where the high-temperature exhaust gas rises too quickly, causing fine droplets to be entrained. Simultaneously, when the high-temperature flue gas is transported from the inlet pipe 13, the impact of the airflow drives the turbine 16 to rotate, thereby rotating the rotating rod 15. 15 drives the rotating frame 18 and the turntable 11 to rotate synchronously through the connecting component. The rotation of the turntable 11 changes the direction of the baffle 12. Since the baffles 12 are arranged at equal intervals, the spray liquid flowing out from the baffle 12 is originally evenly distributed along the channels of two adjacent baffles 12. When the turntable 11 rotates, the direction of the baffle 12 changes, and the liquid distribution channel and liquid distribution position rotate accordingly. This avoids the liquid distribution dead angle caused by long-term fixed liquid distribution, improves the utilization rate of the packing layer 9, and solves the problems of uneven distribution of spray liquid, channel flow and wall flow, and some packing cannot contact the spray liquid in the background technology.

[0036] like Figures 1-2 As shown, in a preferred embodiment of the present invention, a defoaming screen 8 is fixedly installed inside the air outlet pipe 7.

[0037] In practical applications, this embodiment uses a demister 8 to block and intercept water droplets entrained in the exhaust gas, preventing them from entering the subsequent stages of the exhaust pipe 7. This solves the problem in the prior art where fine mist droplets are carried by the rising airflow, and the entrainment of mist increases the burden on subsequent equipment.

[0038] like Figures 1-4 As shown, in a preferred embodiment of the present invention, the diameter of the disc 14 increases first and then decreases upward along the central axis of the intake pipe 13, and the maximum diameter of the disc 14 is greater than the diameter of the intake pipe 13.

[0039] In practical application, this embodiment sets the shape of the disc 14 to a flying saucer shape. When the high-temperature exhaust gas is ejected from the intake pipe 13 and rises to impact the bottom of the disc 14, it will disperse and move along the inclined conical surface at the bottom of the disc 14, so that the exhaust gas is evenly dispersed along the edge of the disc 14 before rising, avoiding the airflow from concentrating and impacting the local area of ​​the filler layer 9. When water droplets are separated from the filler layer 9 and fall to the top of the disc 14, they will also slide down along the inclined conical surface at the top of the disc 14, so that the water droplets drip along the edge of the disc 14, preventing the water droplets from falling into the intake pipe 13 and blocking the air passage. This disperses the rising airflow and protects the air passage of the intake pipe 13.

[0040] like Figures 1-5 As shown, in a preferred embodiment of the present invention, the top of the fixed disk 10 is provided with a conical surface 1001, the diameter of the conical surface 1001 increases upward along the central axis of the fixed disk 10, the top of the conical surface 1001 abuts against the inner wall of the adsorption tank 1, and the bottom of the conical surface 1001 abuts against the top of the turntable 11.

[0041] In practical application, the atomized water droplets sprayed from the atomizing nozzle 2 will fall onto the inner wall of the adsorption tank 1, forming a water flow that slides down the inner wall. After sliding onto the conical surface 1001, the water flows down along the inclined surface of the conical surface 1001 and converges, then falls onto the turntable 11. It enters the baffle plate 12 inside the turntable 11 for deceleration and buffering, so that the water flowing down the wall re-enters the liquid distribution channel. This avoids the problem of the spray liquid flowing down the wall and forming a wall flow, directly impacting the packing layer 9 and causing local liquid accumulation, thus ensuring that the spray liquid enters the packing layer 9 evenly.

[0042] like Figures 1-3 As shown, in a preferred embodiment of the present invention, a first cooling pipe 3 is provided at the connection between the atomizing nozzle 2 and the three-way valve 4, and the first cooling pipe 3 cools the liquid input into the atomizing nozzle 2.

[0043] Specifically, a second cooling pipe 17 is provided on the air intake pipe 13, which cools the gas flowing in the air intake pipe 13.

[0044] In practical application, this embodiment uses the first cooling pipe 3 to cool the spray liquid entering the atomizing nozzle 2. The low-temperature spray liquid can improve the absorption effect of NMP vapor after being sprayed out. The second cooling pipe 17 cools the high-temperature exhaust gas entering the adsorption tank 1. After the exhaust gas is cooled, the gas volume shrinks and the rising speed slows down, preventing the rising airflow from being too strong and carrying the atomized water vapor into the exhaust pipe 7. This solves the problem in the background technology that high-temperature exhaust gas causes the gas volume to expand, the rising speed to increase, and the entrainment of mist. At the same time, the low-temperature environment increases the solubility of NMP vapor and improves the absorption efficiency.

[0045] like Figures 1-8 As shown, in a preferred embodiment of the present invention, the connecting assembly includes a sleeve 23, a swivel ring 24, a straight plate 25, a long groove 26, and a short groove 27. The bottom end of the rotating frame 18 is located above the top end of the rotating rod 15. The short groove 27 is formed at the bottom end of the rotating frame 18, and the long groove 26 is formed at the top end of the rotating rod 15. The swivel ring 24 is slidably sleeved on the outer circular surface of the top end of the rotating rod 15. The straight plate 25 is fixedly installed on the inner wall of the swivel ring 24, and the bottom end of the straight plate 25 is connected to the long groove. 26. A sliding connection is provided. A bracket 101 is fixedly installed on the inner wall of the adsorption tank 1. A lifting bend 21 is slidably installed on the bracket 101. The lifting bend 21 is driven to rise and fall by a drive assembly. A sleeve 23 is fixedly installed on the top of the lifting bend 21. A rotating ring 24 is rotatably installed inside the sleeve 23. When the drive assembly drives the lifting bend 21 to rise, it drives the sleeve 23, the rotating ring 24 and the straight plate 25 to rise synchronously, so that the top of the straight plate 25 slides into the short groove 27.

[0046] Specifically, the drive assembly includes an electric cylinder 19, a limiting plate 20, and a float 22. The electric cylinder 19 is fixedly installed at the bottom of the adsorption tank 1, and the movable end of the electric cylinder 19 is located inside the adsorption tank 1. The limiting plate 20 is fixedly installed at the movable end of the electric cylinder 19, and one end of the limiting plate 20 is sleeved on the lifting bend 21. A fixing ring 2101 is fixedly installed on the outer circumference of the lifting bend 21, and the bottom of the limiting plate 20 abuts against the fixing ring 2101. The float 22 is fixedly installed at the bottom end of the lifting bend 21.

[0047] In practical application, to avoid the atomized water droplets falling haphazardly and the liquid distribution being disordered due to the turntable 11 being constantly rotating, the turntable 11 is set to rotate intermittently. When the turntable 11 needs to be stationary, the limit plate 20 is driven to descend by the electric cylinder 19. The limit plate 20 presses down on the fixing ring 2101, causing the lifting bend 21 to descend synchronously. At this time, the float 22 is immersed in the solution at the bottom of the adsorption tank 1. The lifting bend 21 causes the sleeve 23 to descend synchronously, and the sleeve 23 causes the rotating ring 24 to descend. As the plate 25 slides down within the long groove 26, its top end slides down away from the short groove 27, separating it from the rotating frame 18. At this point, when the turbine 16 drives the rotating rod 15 to rotate, the plate 25 can only rotate freely within the long groove 26 with the rotating ring 24. The rotating frame 18 remains stationary, and the turntable 11 also remains stationary, maintaining stable spray distribution. When it is necessary to rotate the turntable 11 to change the direction of the baffle plate 12, the electric cylinder 19 drives the limiting plate 20 to rise, causing the limiting plate 20 to... Away from the fixed ring 2101, under the buoyancy of the float 22, the lifting bend 21 rises synchronously. The sleeve 23 and rotating ring 24 on the lifting bend 21 also rise synchronously. During the ascent, the rotating ring 24 and the straight plate 25 rotate continuously with the rotating rod 15. If the long slot 26 is not aligned with the short slot 27, the top of the straight plate 25 will abut against the bottom of the rotating frame 18. The buoyancy of the float 22 constantly provides an upward force to the lifting bend 21, sleeve 23, and rotating ring 24. Once the rotating rod... At the instant that the long trough 26 and the short trough 27 are aligned, the lifting bend 21 rises, causing the rotating ring 24 to drive the straight plate 25 to rise synchronously and insert into the short trough 27. At this time, the rotation of the rotating rod 15 drives the rotating frame 18 to rotate synchronously through the transmission of the straight plate 25, which in turn drives the turntable 11 to rotate, realizing the intermittent rotation of the turntable 11. This ensures that the baffle plate 12 can periodically change direction and re-distribute the liquid, eliminating dead angles in the liquid distribution, while avoiding the problem of the spray liquid falling randomly and the liquid distribution being uneven due to continuous rotation.

[0048] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A tail gas spray adsorption device for NMP recovery, characterized in that, include: An adsorption tank (1) is provided with an air outlet pipe (7) at the top and a drain pipe (102) at the bottom. Inside the adsorption tank (1), from top to bottom, there are atomizing nozzles (2), a fixed plate (10), a packing layer (9), and an air inlet pipe (13). The atomizing nozzles (2) are fixedly installed inside the adsorption tank (1), and the air inlet end of the atomizing nozzles (2) penetrates through the adsorption tank (1). The air inlet end of the atomizing nozzles (2) is connected to a three-way valve (4). The two ports of the three-way valve (4) are connected to the water inlet pipe (5) and the circulation pipe (6), respectively. The water inlet pipe (5) is connected to the external water supply assembly, the circulation pipe (6) is connected to the bottom of the adsorption tank (1), the fixed plate (10) and the packing layer (9) are both fixedly installed on the inner wall of the adsorption tank (1), a turntable (11) is rotatably installed in the fixed plate (10), and multiple baffles (12) arranged at equal intervals are fixedly installed on the inner wall of the turntable (11), the air inlet pipe (13) is arranged through the bottom of the adsorption tank (1), and the air inlet pipe (13) is coaxially arranged with the adsorption tank (1), and the horizontal height of the air outlet end of the air inlet pipe (13) is higher than the bottom liquid level of the adsorption tank (1); A disc (14) is fixedly installed on the top of the intake pipe (13) with a gap between them. A rotating rod (15) is rotatably installed inside the disc (14). The bottom end of the rotating rod (15) extends into the intake pipe (13). A connecting component is provided at the top of the rotating rod (15), and a turbine (16) is coaxially fixedly installed at the bottom of the rotating rod (15). The turbine (16) is rotatably installed inside the intake pipe (13). A rotating frame (18) is rotatably installed inside the packing layer (9). The top end of the rotating frame (18) is fixedly connected to the bottom of the turntable (11), and the bottom of the rotating frame (18) is connected to the connecting component.

2. The tail gas spray adsorption device for NMP recovery according to claim 1, characterized in that, A defogging screen (8) is fixedly installed inside the air outlet pipe (7).

3. The tail gas spray adsorption device for NMP recovery according to claim 1, characterized in that, The diameter of the disc (14) increases first and then decreases upward along the central axis of the intake pipe (13), and the maximum diameter of the disc (14) is greater than the diameter of the intake pipe (13).

4. The tail gas spray adsorption device for NMP recovery according to claim 1, characterized in that, The top of the fixed disk (10) is provided with a conical surface (1001). The diameter of the conical surface (1001) increases upward along the central axis of the fixed disk (10). The top of the conical surface (1001) abuts against the inner wall of the adsorption tank (1), and the bottom of the conical surface (1001) abuts against the top of the turntable (11).

5. The tail gas spray adsorption device for NMP recovery according to claim 1, characterized in that, A first cooling pipe (3) is provided at the connection between the atomizing nozzle (2) and the three-way valve (4), and the first cooling pipe (3) cools the liquid entering the atomizing nozzle (2).

6. The tail gas spray adsorption device for NMP recovery according to claim 1, characterized in that, The air inlet pipe (13) is provided with a second cooling pipe (17), which cools the gas flowing in the air inlet pipe (13).

7. The tail gas spray adsorption device for NMP recovery according to claim 1, characterized in that, The connecting assembly includes a sleeve (23), a swivel ring (24), a straight plate (25), a long groove (26), and a short groove (27). The bottom end of the rotating frame (18) is located above the top end of the rotating rod (15). The short groove (27) is opened at the bottom end of the rotating frame (18), and the long groove (26) is opened at the top end of the rotating rod (15). The swivel ring (24) is slidably sleeved on the outer circular surface of the top end of the rotating rod (15). The straight plate (25) is fixedly installed on the inner wall of the swivel ring (24), and the bottom end of the straight plate (25) is slidably connected to the long groove (26). A bracket (101) is fixedly installed on the inner wall of the adsorption tank (1). A lifting bend (21) is slidably installed on the bracket (101). The lifting bend (21) is driven to rise and fall by a drive assembly. A sleeve (23) is fixedly installed on the top of the lifting bend (21). A rotating ring (24) is rotatably installed inside the sleeve (23). When the drive assembly drives the lifting bend (21) to rise, it drives the sleeve (23), the rotating ring (24) and the straight plate (25) to rise synchronously, so that the top of the straight plate (25) slides into the short groove (27).

8. The tail gas spray adsorption device for NMP recovery according to claim 7, characterized in that, The drive assembly includes an electric cylinder (19), a limiting plate (20), and a float (22). The electric cylinder (19) is fixedly installed at the bottom of the adsorption tank (1). The movable end of the electric cylinder (19) is located inside the adsorption tank (1). The limiting plate (20) is fixedly installed at the movable end of the electric cylinder (19). One end of the limiting plate (20) is sleeved on the lifting bend (21). A fixing ring (2101) is fixedly installed on the outer circular surface of the lifting bend (21). The bottom of the limiting plate (20) abuts against the fixing ring (2101). The float (22) is fixedly installed at the bottom end of the lifting bend (21).

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