A high tower NMP recovery device and recovery method

Abstract

The present invention relates to the technical field of NMP gas recovery, and in particular to a high-tower NMP recovery device and recovery method, comprising a shell, wherein a mixing mechanism is arranged at the inner upper end of the shell; the mixing mechanism comprises an air cylinder and a water cylinder, wherein the lower ends of the air cylinder and the water cylinder are both connected to a collecting pipe through an input pipe, wherein the lower ends of the collecting pipe are connected to a mixing pipe, and piston plates are slidably arranged on the inner sides of the air cylinder and the water cylinder. The present invention uses an extrusion mechanism, and after the water-gas mixture is stirred, it will enter the inner side of the groove of the extrusion mechanism, and the first roller and the second roller of the extrusion mechanism rotate in opposite directions, which can drive a plurality of bosses and a plurality of grooves to be respectively combined and separated, and when the bosses are combined with the grooves, a large pressure can be applied to the water-gas mixture inside the grooves, and the large pressure can greatly increase the speed at which the NMP gas dissolves in water, thereby quickly absorbing the NMP gas and improving the recovery efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of NMP gas recovery, in particular to a high-tower NMP recovery device and a recovery method. Background Art

[0002] N-Methylpyrrolidone (NMP for short) is a colorless, transparent liquid with low viscosity, a slight ammonia smell, good chemical and thermal stability, high polarity, low volatility, and can be miscible with water in any ratio. NMP gas is a commonly used solvent in the production of lithium batteries. In the actual production process, NMP will continuously evaporate into the surrounding air and be discharged from the production workshop along with the air. Due to its certain toxicity, NMP cannot be directly discharged into the environment. The air containing NMP needs to be recycled before it can be discharged.

[0003] After searching, a Chinese patent with publication number: CN218421936U discloses an NMP waste liquid recovery device, including a tower body and a liquid outlet pipe, an air inlet pipe is opened at the bottom of one side of the tower body, and a liquid outlet pipe is opened on the other side, one side of the liquid outlet pipe is fixedly connected to the tower body, and a valve is fixedly installed on the other side, a support leg is fixedly connected to the bottom of the tower body, a first safety cover is fixedly connected to the top of the tower body by bolts, a spraying device is arranged in the tower body, an exhaust hole is opened on one side of the top of the tower body, a second safety cover is fixedly connected to the middle of the bottom end of the tower body by bolts, a stirring mechanism is arranged in the second safety cover, a guide plate is fixedly connected to the inner wall of the tower body, and a filter is installed inside the tower body.

[0004] Based on the above search and combined with actual problems, it is found that the existing recovery device for recovering NMP gas cannot apply pressure to the NMP gas. In order to accelerate the dissolution rate of the gas, it is usually only by increasing the contact area between water and NMP gas. Although this dissolution method can accelerate the dissolution rate of NMP gas to a certain extent, it takes a long time, thereby reducing the recovery efficiency of NMP gas. Moreover, it is difficult to dissolve NMP gas more fully in water by this method, resulting in a certain amount of NMP gas remaining in the discharged gas. Summary of the invention

[0005] The object of the present invention is to provide a high tower NMP recovery device and a recovery method to solve the problems raised in the above-mentioned background technology.

[0006] The technical scheme of the present invention is: a high-tower NMP recovery equipment, comprising a shell, wherein a mixing mechanism is arranged at the inner upper end of the shell; the mixing mechanism comprises an air cylinder and a water cylinder, the lower ends of the air cylinder and the water cylinder are connected to a collecting pipe through an input pipe, the lower end of the collecting pipe is connected to a mixing pipe, the inner sides of the air cylinder and the water cylinder are slidably provided with piston plates, a reciprocating mechanism is arranged between the two piston plates and the shell, the lower end of the mixing pipe is provided with a stirring mechanism for fully mixing gas and liquid, and the inner lower end of the shell is provided with an extrusion mechanism connected to the stirring mechanism; the extrusion mechanism comprises a stopper fixed to the inner side of the shell, the inside of the stopper is symmetrically provided with two arc grooves, the inner sides of the two arc grooves are respectively rotatably connected with a first roller and a second roller, and the outer sides of the first roller and the second roller are respectively provided with the same The cam is a plurality of movable parts, each of which is a pair of movable parts, each of which is a pair of movable parts having a plurality of movable parts, and each of which is a pair of movable parts having a plurality of movable parts. The movable parts are combined with each other to form a plurality of movable parts. The movable parts are combined with each other to form a plurality of movable parts.

[0007] Preferably, a roller shaft is fixed through the inside of the first roller and the second roller, and mutually meshing synchronous gears are fixed at one end of the two roller shafts. A first motor is installed on the outside of the outer shell, and the driving end of the first motor is fixed to one end of one of the roller shafts.

[0008] Preferably, each of the bosses is respectively matched with the inner side of each groove, and the top of the boss does not contact the bottom of the groove, a sealing groove is opened inside the arc groove located at the second roller position, and each of the bosses is sealingly matched with the inner side of the sealing groove.

[0009] Preferably, the stirring mechanism includes a cylindrical barrel arranged at a middle position on the inner side of the shell, a plurality of injection holes opened on the outer side of the mixing tube at the lower end, and a driving gear fixed on the outer side of the mixing tube, a cavity is arranged on the inner upper end of the cylindrical barrel, and the cylindrical barrel and the inner side of the cavity are rotatably connected with two stirring shafts, the upper ends of the two stirring shafts are fixed with driven gears meshing with the driving gears, the outer sides of the two stirring shafts are fixed with a plurality of staggered stirring plates at the inner side of the cylindrical barrel, the two driven gears and the driving gear are both located on the inner side of the cavity, the lower end of the cylindrical barrel is connected with the inner side of the two arc grooves, a plurality of small holes are evenly opened on the surface of each stirring plate, the upper end of the mixing tube is rotatably connected with the collecting tube, and a sealing ring is arranged between the upper end of the mixing tube and the collecting tube.

[0010] Preferably, a fixing rod is fixed on the inner side of the mixing tube at the position of the axis center line, and a spiral blade is fixed on the outer side of the fixing rod.

[0011] Preferably, the lower ends of the air cylinder and the water cylinder are respectively connected with an air inlet pipe and a water inlet pipe extending to the outside of the shell, and the air inlet pipe, the water inlet pipe and the two input pipes are all provided with a one-way valve inside.

[0012] Preferably, a collecting tank is provided on the inner side of the shell at a position below the stopper, and a discharge pipe communicating with the interior of the collecting tank is inserted on one side of the shell.

[0013] The present invention also provides a high-tower NMP recovery method, which specifically comprises the following steps:

[0014] Step 1: The two piston plates of the mixing mechanism are driven to move up and down synchronously by the reciprocating mechanism, and the NMP gas and water are simultaneously pressed into the inner side of the collecting tube and the mixing tube. The NMP gas and water are initially contacted and mixed inside the collecting tube and the mixing tube to form a water-gas mixture. Then, the water-gas mixture is sprayed to the inner side of the cylindrical tube of the stirring mechanism through multiple injection holes at the lower end of the mixing tube. The water-gas mixture impacts the spiral blades to drive the mixing tube to rotate. The rotation of the mixing tube can make the water-gas mixture sprayed through the injection holes more evenly distributed on the inner side of the cylindrical tube.

[0015] Step 2: When the mixing tube rotates, the driving gear of the stirring mechanism is driven to rotate. The driving gear drives the two driven gears to rotate in the same direction through the teeth. The two driven gears respectively drive the two stirring shafts to rotate. The two stirring shafts respectively drive the multiple stirring plates on the outside to rotate. When the multiple stirring plates rotate, the water-gas mixture sprayed on the inner side of the cylindrical tube is beaten and stirred, and the water is beaten and broken into fine water droplets, thereby increasing the contact area between water and NMP gas.

[0016] Step 3, the water-gas mixture after beating and stirring enters the inner side of the two arc grooves of the extrusion mechanism through the lower end of the cylindrical barrel, and at the same time, the operation of the first motor of the extrusion mechanism drives a roller shaft at the corresponding position to rotate, and the other roller shaft is driven to rotate in the opposite direction through the mutual meshing of the two synchronous gears, so that the first roller and the second roller rotate in the opposite direction. Under the action of the mutual meshing of the two synchronous gears, the first roller and the second roller keep rotating at the same speed in the opposite direction, so that the multiple grooves on the outside of the first roller correspond to the multiple bosses on the outside of the second roller one by one, and the multiple grooves and the multiple bosses are respectively combined and separated. When the corresponding grooves and bosses are combined, the boss presses the water-gas mixture flowing between the two arc grooves into the inner side of the groove. Since the top of the boss does not contact the bottom of the groove, the boss can apply pressure to the water-gas mixture inside the groove. After the pressure is applied, the speed of NMP gas dissolving in water is greatly increased. When the boss is separated from the groove, the water dissolved in NMP gas in the inner side of the groove flows to the inner side of the collection tank, and finally discharged outward through the discharge pipe to realize the recovery and treatment of NMP gas.

[0017] The present invention provides a high tower NMP recovery device and a recovery method by improvement, which have the following improvements and advantages compared with the prior art:

[0018] First, the present invention can suck NMP gas and water separately and then pre-mix them through the mixing mechanism. The mixed water-gas mixture will enter the stirring mechanism. The stirring mechanism can beat and stir the preliminarily mixed NMP gas and water. When beating the water, the water can be broken into a large number of fine water droplets, thereby increasing the contact area between water and NMP gas, thereby increasing the rate at which NMP gas dissolves in water.

[0019] Secondly, the present invention uses an extrusion mechanism, and after the water-gas mixture is stirred, it will enter the inner side of the groove of the extrusion mechanism. The first roller and the second roller of the extrusion mechanism rotate in opposite directions, which can drive multiple bosses and multiple grooves to combine and separate respectively. When the bosses are combined with the grooves, a large pressure can be applied to the water-gas mixture inside the grooves. The large pressure can greatly increase the speed at which NMP gas dissolves in water, thereby quickly absorbing NMP gas and improving recovery efficiency.

[0020] Thirdly, the present invention can adjust the distance between the end of the connecting rod connected to the adjusting slider and the driving shaft through the length adjustment mechanism, so as to adjust the up and down movement stroke of the two piston plates. When the two piston plates move back and forth each time, different volumes of NMP gas and water can be pressed into the collecting pipe and the mixing pipe. According to the different temperatures of water and NMP gas, different proportions of NMP gas and water are mixed to ensure that the NMP gas can be completely dissolved in the liquid medium, thereby improving the recovery efficiency of the NMP gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the present invention from a first viewing angle;

[0023] Figure 2 It is a schematic diagram of the structure of the second viewing angle of the present invention;

[0024] Figure 3 It is a cross-sectional structural schematic diagram of the present invention;

[0025] Figure 4 It is a cross-sectional structural schematic diagram of the extrusion mechanism in the present invention;

[0026] Figure 5 It is a schematic cross-sectional structural diagram of the first rotating roller and the second rotating roller in the present invention;

[0027] Figure 6 It is a schematic diagram of the structure inside the collecting tube and the mixing tube in the present invention;

[0028] Figure 7 It is a cross-sectional structural schematic diagram of the stirring mechanism in the present invention;

[0029] Figure 8 For the present invention Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0030] Reference numerals:

[0031] 1. Shell; 2. Air cylinder; 3. Water cylinder; 4. Piston plate; 5. Air inlet pipe; 6. Water inlet pipe; 7. Collecting pipe; 8. Mixing pipe; 9. Injection hole; 10. Collection tank; 11. Discharge pipe; 12. Input pipe; 101. Stopper; 102. Arc groove; 103. First roller; 104. Second roller; 105. Boss; 106. Groove; 107. Roller shaft; 108. Synchronous gear; 109. First Motor; 110, sealing groove; 201, cylindrical tube; 202, cavity; 203, driving gear; 204, stirring shaft; 205, driven gear; 206, stirring plate; 207, fixing rod; 208, spiral blade; 301, second motor; 302, driving shaft; 303, rotating rod; 304, connecting rod; 305, piston rod; 306, adjusting groove; 307, adjusting screw; 308, adjusting slider. DETAILED DESCRIPTION

[0032] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention provides a high tower NMP recovery device and recovery method through improvement. The technical solution of the present invention is:

[0034] Embodiment 1:

[0035] like Figures 1 to 8 As shown, the embodiment of the present invention provides a high-tower NMP recovery device, including a housing 1, wherein a mixing mechanism is provided at the inner upper end of the housing 1; the mixing mechanism includes a compressed air cylinder 2 and a water cylinder 3, and the lower ends of the compressed air cylinder 2 and the water cylinder 3 are both connected to a collecting pipe 7 (such as Figure 6 As shown in the figure, the lower end of the collecting pipe 7 is connected with a mixing pipe 8, the inner sides of the air cylinder 2 and the water cylinder 3 are slidably provided with piston plates 4, the lower ends of the air cylinder 2 and the water cylinder 3 are respectively connected with an air inlet pipe 5 and a water inlet pipe 6 extending to the outside of the shell 1, and the insides of the air inlet pipe 5, the water inlet pipe 6 and the two input pipes 12 are all provided with a one-way valve, a reciprocating mechanism is provided between the two piston plates 4 and the shell 1, the lower end of the mixing pipe 8 is provided with a stirring mechanism for fully mixing gas and liquid, and the inner lower end of the shell 1 is provided with an extrusion mechanism connected with the stirring mechanism; the extrusion mechanism includes a stopper 101 fixed to the inner side of the shell 1, and the inside of the stopper 101 is symmetrically provided with two arc grooves 102 (as shown in the figure Figure 4As shown in the figure, the first roller 103 and the second roller 104 are rotatably connected to the inner sides of the two arc grooves 102 respectively, and the outer sides of the first roller 103 and the second roller 104 are respectively provided with the same number of grooves 106 and bosses 105; the reciprocating mechanism includes two piston rods 305 fixed to the upper ends of the two piston plates 4 and a second motor 301 installed on the outer side of the shell 1, and the driving end of the second motor 301 is fixed with a driving shaft 302 rotatably connected to the inner side of the shell 1, and four rotating rods 303 are respectively provided at the positions corresponding to the two piston rods 305 on the driving shaft 302, and the upper ends of the two piston rods 305 are rotatably connected to the connecting rod 304, and the two piston rods 305 at the same position are connected to the connecting rod 304. The rotating rod 303 and the corresponding connecting rod 304 are movably connected through a length adjustment mechanism; the length adjustment mechanism includes two adjustment grooves 306 opened at one end of the two rotating rods 303, and the inside of the two adjustment grooves 306 is rotatably inserted with an adjustment screw 307, and the inner side of the two adjustment grooves 306 is slidably connected with an adjustment slider 308, and the two adjustment screws 307 are rotatably connected to the inner ends of the adjustment slider 308 through threads, and the upper end of the connecting rod 304 is rotatably connected to the outer side of the adjustment slider 308, and each boss 105 can be respectively adapted to the inner side of each groove 106, and the top end of the boss 105 does not contact the bottom end of the groove 106.

[0036] Furthermore, roller shafts 107 are fixedly passed through the interior of the first roller 103 and the second roller 104, and mutually meshing synchronous gears 108 are fixedly fixedly disposed at one end of the two roller shafts 107. A first motor 109 is installed at the outer side of the housing 1, and a driving end of the first motor 109 is fixedly disposed at one end of one of the roller shafts 107.

[0037] The first motor 109 is used to drive the roller shaft 107 to rotate, thereby driving the first roller 103 and the second roller 104 to rotate. Under the action of the two synchronous gears 108 meshing with each other, the first roller 103 and the second roller 104 can keep rotating in opposite directions at the same speed, so that the multiple grooves 106 on the outside of the first roller 103 can correspond to the multiple bosses 105 on the outside of the second roller 104 one by one, and the multiple grooves 106 and the multiple bosses 105 can be combined and separated respectively, so as to extrude the water-gas mixture.

[0038] Furthermore, a sealing groove 110 is provided inside the arc groove 102 at the position of the second roller 104, and each boss 105 is sealingly adapted to the inner side of the sealing groove 110;

[0039] Each boss 105 is sealed and adapted to the inner side of the sealing groove 110, so that no gap is generated between the second roller 104 and the inner side of the arc groove 102 at the corresponding position, thereby preventing the water-gas mixture from leaking from the gap between the second roller 104 and the arc groove 102, ensuring that all the water-gas mixture can be squeezed by the boss 105 and the groove 106, and ensuring that the NMP gas can be fully absorbed.

[0040] Furthermore, the stirring mechanism includes a cylindrical barrel 201 arranged at the middle position of the inner side of the shell 1, a plurality of injection holes 9 opened at the lower end of the outer side of the mixing tube 8, and a driving gear 203 fixed to the outer side of the mixing tube 8. A cavity 202 is arranged at the inner upper end of the cylindrical barrel 201, and two stirring shafts 204 are rotatably connected to the inner side of the cylindrical barrel 201 and the cavity 202. A driven gear 205 meshing with the driving gear 203 is fixed to the upper ends of the two stirring shafts 204. The outer sides of the two stirring shafts 204 are located at the inner side of the cylindrical barrel 201. A plurality of staggered stirring plates 206 are fixed at each position, two driven gears 205 and a driving gear 203 are located on the inner side of the cavity 202, the lower end of the cylindrical barrel 201 is connected to the inner side of the two arc grooves 102, a plurality of small holes are evenly opened on the surface of each stirring plate 206, the upper end of the mixing tube 8 is rotatably connected to the manifold 7, and a sealing ring is provided between the upper end of the mixing tube 8 and the manifold 7, a fixing rod 207 is fixed on the inner side of the mixing tube 8 at the position of the axis center line, and a spiral blade 208 is fixed on the outer side of the fixing rod 207;

[0041] The initially mixed NMP gas and water can be beaten and stirred by the stirring mechanism. When beating the water, the water can be broken into a large number of small water droplets, which increases the contact area between water and NMP gas, thereby increasing the rate at which NMP gas dissolves in water.

[0042] Furthermore, a collecting tank 10 is provided on the inner side of the housing 1 below the stopper 101, and a discharge pipe 11 communicating with the interior of the collecting tank 10 is inserted on one side of the housing 1;

[0043] The water dissolved with NMP gas in the groove 106 flows to the inside of the collection tank 10, and finally is discharged to the outside through the discharge pipe 11, so as to realize the recovery and treatment of NMP gas.

[0044] Embodiment 2:

[0045] This embodiment also provides a high tower NMP recovery method, which specifically comprises the following steps:

[0046] Step 1: The two piston plates 4 of the mixing mechanism are driven to move up and down synchronously by the reciprocating mechanism, and the NMP gas and water are simultaneously pressed into the inner sides of the collecting tube 7 and the mixing tube 8. The NMP gas and water are initially contacted and mixed inside the collecting tube 7 and the mixing tube 8 to form a water-gas mixture. Then, the water-gas mixture is sprayed to the inner side of the cylindrical tube 201 of the stirring mechanism through the multiple injection holes 9 at the lower end of the mixing tube 8. The water-gas mixture impacts the spiral blades 208 to drive the mixing tube 8 to rotate. The rotation of the mixing tube 8 can make the water-gas mixture sprayed through the injection holes 9 more evenly distributed on the inner side of the cylindrical tube 201;

[0047] Step 2: When the mixing tube 8 rotates, the driving gear 203 of the stirring mechanism is driven to rotate. The driving gear 203 drives the two driven gears 205 to rotate in the same direction through the teeth. The two driven gears 205 respectively drive the two stirring shafts 204 to rotate. The two stirring shafts 204 respectively drive the multiple stirring plates 206 on the outside to rotate. When the multiple stirring plates 206 rotate, the water-gas mixture sprayed on the inner side of the cylindrical tube 201 is beaten and stirred, and the water is beaten and broken into fine water droplets, thereby increasing the contact area between water and NMP gas.

[0048] Step 3: The water-gas mixture after beating and stirring enters the inner sides of the two arc grooves 102 of the extrusion mechanism through the lower end of the cylindrical barrel 201. At the same time, the first motor 109 of the extrusion mechanism drives a roller shaft 107 at the corresponding position to rotate, and the other roller shaft 107 is driven to rotate in the opposite direction through the mutual engagement of the two synchronous gears 108, so that the first roller 103 and the second roller 104 rotate in the opposite direction. Under the action of the mutual engagement of the two synchronous gears 108, the first roller 103 and the second roller 104 keep rotating in the opposite direction at the same speed, so that the multiple grooves 106 on the outer side of the first roller 103 correspond to the multiple bosses 105 on the outer side of the second roller 104 one by one. The plurality of grooves 106 and the plurality of bosses 105 can be combined and separated respectively. When the corresponding grooves 106 and bosses 105 are combined, the bosses 105 press the water-gas mixture flowing between the two arc-shaped grooves 102 into the inner side of the grooves 106. Since the top of the boss 105 does not contact the bottom of the groove 106, the boss 105 can apply pressure to the water-gas mixture inside the groove 106. After the pressure is applied, the speed at which the NMP gas dissolves in the water is greatly increased. When the bosses 105 are separated from the grooves 106, the water dissolved with the NMP gas inside the grooves 106 flows to the inner side of the collection tank 10, and is finally discharged outwardly through the discharge pipe 11, thereby realizing the recovery and treatment of the NMP gas.

[0049] Working principle: When in use, liquid water for dissolving NMP gas is connected to the inner side of the water cylinder 3 through the water inlet pipe 6, and NMP gas is connected to the inner side of the air cylinder 2 through the air inlet pipe 5, and then the second motor 301 of the reciprocating mechanism is controlled to drive the driving shaft 302 to rotate, and the driving shaft 302 drives the four rotating rods 303 to rotate. Since one end of the rotating rod 303 is movably connected to one end of the connecting rod 304, the rotating rod 303 can drive the piston plate 4 to reciprocate up and down once through the connecting rod 304 for each rotation of the rotating rod 303, and the two piston plates 4 inside the air cylinder 2 and the water cylinder 3 can move up and down synchronously. When the two piston plates 4 move up, the conduction directions of the one-way valves inside the water inlet pipe 6 and the air inlet pipe 5 are divided. The two piston plates 4 are respectively directed to the water cylinder 3 and the air cylinder 2, so that water and NMP gas can be sucked into the inner sides of the water cylinder 3 and the air cylinder 2 through the water inlet pipe 6 and the air inlet pipe 5, respectively. When the two piston plates 4 move downward, the conduction directions of the one-way valves inside the two input pipes 12 are all directed to the inside of the manifold 7. Therefore, the NMP gas and water sucked into the inner sides of the air cylinder 2 and the water cylinder 3 can be pressed into the inner side of the manifold 7 through the two input pipes 12, and then flow into the inner side of the mixing tube 8 through the lower end of the manifold 7. The NMP gas and water are preliminarily contacted and mixed on the inner sides of the manifold 7 and the mixing tube 8, and then the water-gas mixture is sprayed toward the inner side of the cylindrical tube 201 of the stirring mechanism through the multiple injection holes 9 at the lower end of the mixing tube 8;

[0050] Since a fixing rod 207 and a spiral blade 208 are fixed to the inner side of the mixing tube 8, the mixing tube 8 can be driven to rotate under the impact of the water-gas mixture on the spiral blade 208. The rotation of the mixing tube 8 can make the water-gas mixture sprayed through the injection hole 9 more evenly distributed on the inner side of the cylindrical tube 201, thereby improving the mixing uniformity of water and NMP gas in the water-gas mixture. At the same time, when the mixing tube 8 rotates, the driving gear 203 of the stirring mechanism can be driven to rotate. The driving gear 203 drives the two driven gears 205 to rotate in the same direction through the teeth. The two driven gears 205 are respectively The two stirring shafts 204 are driven to rotate, and the two stirring shafts 204 respectively drive the multiple stirring plates 206 on the outside to rotate. When the multiple stirring plates 206 rotate, the water-gas mixture sprayed on the inner side of the cylindrical barrel 201 can be beaten and stirred, and the water can be beaten and broken into fine water droplets, thereby increasing the contact area between water and NMP gas, thereby increasing the rate at which NMP gas dissolves in water, and each stirring plate 206 is provided with a plurality of small holes on its surface, and the plurality of small holes can further break the water, making the water droplets more fine and uniform, and further improving the dissolution efficiency of NMP gas;

[0051] The water-gas mixture after beating and stirring will enter the inner side of the two arc grooves 102 of the extrusion mechanism through the lower end of the cylindrical barrel 201. At the same time, the first motor 109 of the extrusion mechanism drives a roller shaft 107 at the corresponding position to rotate, and this roller shaft 107 drives a synchronous gear 108 at its end to rotate. Through the mutual meshing of the two synchronous gears 108, the other roller shaft 107 can be driven to rotate in the opposite direction, so that the first roller 103 and the second roller 104 can rotate in the opposite direction. Under the action of the mutual meshing of the two synchronous gears 108, the first roller 103 and the second roller 104 can keep rotating in the opposite direction at the same speed, so that the multiple grooves 106 on the outer side of the first roller 103 can correspond to the multiple bosses 105 on the outer side of the second roller 104 one by one. The plurality of grooves 106 and the plurality of bosses 105 can be combined and separated respectively. When the corresponding grooves 106 and bosses 105 are combined, the bosses 105 can press the water-gas mixture flowing between the two arc-shaped grooves 102 into the inner side of the grooves 106. Since the top of the bosses 105 is not in contact with the bottom of the grooves 106, the bosses 105 can apply a large pressure to the water-gas mixture inside the grooves 106. The large pressure can greatly increase the speed at which the NMP gas dissolves in the water, thereby quickly absorbing the NMP gas and improving the recovery efficiency. When the bosses 105 are separated from the grooves 106, the water dissolved with the NMP gas inside the grooves 106 flows to the inner side of the collection tank 10, and is finally discharged outward through the discharge pipe 11, thereby realizing the recovery and treatment of the NMP gas.

[0052] Since a sealing groove 110 is provided inside the arc groove 102 at the position of the second roller 104, each boss 105 is sealed and adapted to the inner side of the sealing groove 110, so that no gap is generated between the second roller 104 and the inner side of the arc groove 102 at the corresponding position, thereby preventing the water-gas mixture from leaking from the gap between the second roller 104 and the arc groove 102 to the inner side of the collection tank 10, ensuring that all the water-gas mixture can be squeezed by the boss 105 and the groove 106, and ensuring that the NMP gas can be fully absorbed;

[0053] At the same time, the two adjusting screws 307 of the length adjustment mechanism are rotated. The two adjusting screws 307 can drive the adjusting slider 308 to move inside the two adjusting grooves 306 through the threads. The adjusting slider 308 can drive the connecting rod 304 to move synchronously along the adjusting groove 306 along the linear direction, so that the distance between the end of the connecting rod 304 connected to the adjusting slider 308 and the driving shaft 302 can be adjusted. By adjusting the distance, the stroke of each up and down movement of the piston plate 4 can be adjusted. According to the different temperatures of NMP gas and water in actual use, water and NMP gas at different temperatures will affect the dissolution rate of NMP gas. By adjusting the up and down movement strokes of the two piston plates 4 located on the inner sides of the air cylinder 2 and the water cylinder 3, different volumes of NMP gas and water can be pressed into the manifold 7 and the mixing tube 8 each time the two piston plates 4 reciprocate. According to the different temperatures of water and NMP gas, different proportions of NMP gas and water are mixed to ensure that the NMP gas can be completely dissolved in the liquid medium.

[0054] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high tower NMP recovery device, comprising a housing (1), characterized in that: A mixing mechanism is provided at the inner upper end of the housing (1); The mixing mechanism comprises an air cylinder (2) and a water cylinder (3), the lower ends of the air cylinder (2) and the water cylinder (3) are connected to a collecting pipe (7) through an input pipe (12), the lower end of the collecting pipe (7) is connected to a mixing pipe (8), piston plates (4) are slidably arranged on the inner sides of the air cylinder (2) and the water cylinder (3), a reciprocating mechanism is arranged between the two piston plates (4) and the outer shell (1), a stirring mechanism for fully mixing gas and liquid is arranged at the lower end of the mixing pipe (8), and an extrusion mechanism connected to the stirring mechanism is arranged at the inner lower end of the outer shell (1); The extrusion mechanism comprises a stopper (101) fixed on the inner side of the housing (1), the stopper (101) having two arc-shaped grooves (102) symmetrically arranged inside, the inner sides of the two arc-shaped grooves (102) being rotatably connected to a first roller (103) and a second roller (104), and the outer sides of the first roller (103) and the second roller (104) being respectively provided with the same number of grooves (106) and bosses (105); The reciprocating mechanism comprises two piston rods (305) fixed at the upper ends of the two piston plates (4) and a second motor (301) mounted on the outer side of the housing (1); a driving shaft (302) rotatably connected to the inner side of the housing (1) is fixed to the driving end of the second motor (301); four rotating rods (303) are respectively arranged at positions corresponding to the two piston rods (305) on the driving shaft (302); the upper ends of the two piston rods (305) are rotatably connected to connecting rods (304); and the two rotating rods (303) and the corresponding connecting rods (304) located at the same position are movably connected via a length adjustment mechanism; The length adjustment mechanism comprises two adjustment slots (306) provided at one end of the two rotating rods (303), an adjustment screw (307) being rotatably inserted inside the two adjustment slots (306), and an adjustment slider (308) being slidably connected to the inner sides of the two adjustment slots (306), the two adjustment screws (307) being rotatably connected to the inner ends of the adjustment slider (308) via threads penetrating therethrough, and the upper end of the connecting rod (304) being rotatably connected to the outer side of the adjustment slider (308).

2. The high tower NMP recovery equipment according to claim 1, wherein: A roller shaft (107) is fixedly passed through the interior of the first rotating roller (103) and the second rotating roller (104), and mutually meshing synchronous gears (108) are fixedly disposed at one end of the two roller shafts (107). A first motor (109) is mounted on the outside of the housing (1), and a driving end of the first motor (109) is fixed to one end of one of the roller shafts (107).

3. The high tower NMP recovery equipment according to claim 1, wherein: Each of the bosses (105) is respectively matched with the inner side of each groove (106), and the top end of the boss (105) does not contact the bottom end of the groove (106). A sealing groove (110) is provided inside the arc-shaped groove (102) at the position of the second rotating roller (104), and each of the bosses (105) is sealingly matched with the inner side of the sealing groove (110).

4. The high tower NMP recovery equipment according to claim 1, wherein: The stirring mechanism comprises a cylindrical barrel (201) arranged at a middle position inside the housing (1), a plurality of injection holes (9) provided at the lower end outside the mixing tube (8), and a driving gear (203) fixed to the outside of the mixing tube (8); a cavity (202) is provided at the upper end inside the cylindrical barrel (201), and two stirring shafts (204) are rotatably connected inside the cylindrical barrel (201) and the cavity (202); a driven gear (205) meshing with the driving gear (203) is fixed at the upper ends of the two stirring shafts (204); and the two stirring shafts (204) are connected to the inner side of the mixing tube (201). A plurality of staggered stirring plates (206) are fixed on the outer side of the stirring shaft (204) at a position inside the cylindrical tube (201); the two driven gears (205) and the driving gear (203) are both located inside the cavity (202); the lower end of the cylindrical tube (201) is connected to the inner side of the two arc-shaped grooves (102); a plurality of small holes are evenly formed on the surface of each stirring plate (206); the upper end of the mixing tube (8) is rotatably connected to the collecting tube (7); and a sealing ring is provided between the upper end of the mixing tube (8) and the collecting tube (7).

5. The high tower NMP recovery equipment according to claim 1, characterized in that: A fixing rod (207) is fixed on the inner side of the mixing tube (8) at the position of the axis center line, and a spiral blade (208) is fixed on the outer side of the fixing rod (207).

6. The high tower NMP recovery equipment according to claim 1, characterized in that: The lower ends of the air cylinder (2) and the water cylinder (3) are respectively connected to an air inlet pipe (5) and a water inlet pipe (6) extending to the outside of the housing (1); the air inlet pipe (5), the water inlet pipe (6) and the two input pipes (12) are each provided with a one-way valve inside.

7. The high tower NMP recovery equipment according to claim 1, characterized in that: A collecting tank (10) is provided on the inner side of the shell (1) at a position below the stopper (101), and a discharge pipe (11) communicating with the interior of the collecting tank (10) is inserted on one side of the shell (1).

8. A high tower NMP recovery method, comprising the high tower NMP recovery equipment according to any one of claims 1 to 7, characterized in that: Specifically include the following steps: Step 1: The two piston plates (4) of the mixing mechanism are driven to move up and down synchronously by the reciprocating mechanism, and the NMP gas and water are simultaneously pressed into the inner sides of the collecting tube (7) and the mixing tube (8). The NMP gas and the water are initially contacted and mixed inside the collecting tube (7) and the mixing tube (8) to form a water-gas mixture, thereby increasing the contact area between the NMP gas and the water. Step 2: When the mixing tube (8) rotates, the driving gear (203) of the stirring mechanism is driven to rotate. The driving gear (203) drives two driven gears (205) to rotate in the same direction through the teeth. The two driven gears (205) respectively drive two stirring shafts (204) to rotate. The two stirring shafts (204) respectively drive multiple stirring plates (206) on the outside to rotate. When the multiple stirring plates (206) rotate, they beat and stir the water-gas mixture sprayed on the inside of the cylindrical tube (201), breaking the water into fine water droplets by beating, thereby increasing the contact area between water and NMP gas. Step 3: The water-gas mixture that has been beaten and stirred enters the inner sides of the two arc-shaped grooves (102) of the extrusion mechanism through the lower end of the cylindrical tube (201), and at the same time, the first roller (103) and the second roller (104) of the extrusion mechanism rotate in opposite directions, so that the multiple grooves (106) on the outer side of the first roller (103) correspond to the multiple bosses (105) on the outer side of the second roller (104) one by one, and the multiple grooves (106) and the multiple bosses (105) are respectively combined and separated. When the corresponding grooves (106) and bosses (105) are combined, the bosses (105) press the water-gas mixture that flows between the two arc-shaped grooves (102) into the inner sides of the grooves (106), and the bosses (105) apply pressure to the water-gas mixture inside the grooves (106), and the speed at which the NMP gas dissolves in water is increased after the pressure is applied.

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