An NMP recovery device

Abstract

The utility model discloses a kind of NMP recovery device, it includes recovery tank and the cooling tank of recovery tank one side installation, connection pipe is equipped between the recovery tank and cooling tank, the top of the recovery tank is equipped with lifting mechanism, the filter plate for solid-liquid separation filtration is equipped in lifting mechanism, and the filter plate is arranged in the recovery tank;The recovery tank is also equipped with inner wall cleaning mechanism, stirring mechanism, heating assembly and impurity recovery component;The filter plate is equipped with first cleaning component.The utility model is broken through stubborn impurity layer by setting first cleaning component on filter plate, and multiple cleaning is realized by cooperating with the setting impurity recovery component, avoids filter cake formation, reduces the situation of jamming;By setting inner wall cleaning mechanism, vibration cleaning and scraping treatment action are carried out to inner wall, reduce the influence of impurity layer, so that heating pipe heat transfer efficiency is improved, thereby reduce the time of heating pipe continuous work, thereby reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the technical field of NMP treatment equipment, and specifically to an NMP recovery device. Background Technology

[0002] N-Methylpyrrolidone, commonly known as NMP, is a colorless, transparent, oily liquid with a slight amine odor. It has low volatility, excellent thermal and chemical stability, and can evaporate with water vapor. N-Methylpyrrolidone is widely used in industries such as lithium batteries, pharmaceuticals, pesticides, pigments, cleaning agents, and insulating materials.

[0003] Because NMP is hazardous, it cannot be discharged indiscriminately and must be recycled. This not only allows for reuse but also prevents environmental pollution. However, existing recycling systems use multiple processes to remove impurities from NMP, which is not energy-efficient and increases costs. Furthermore, after NMP is recycled, it is left to cool, which is time-consuming and hinders the rapid utilization of the NMP liquid. To address the aforementioned issues, application number 202222949417.5 discloses an energy-saving NMP recovery device, comprising a recovery tank and a cooling tank installed on one side of the recovery tank. Symmetrical first fixing blocks are installed on both sides of the inner wall of the recovery tank. Slots of different heights are opened on opposite sides of the two first fixing blocks. A filter plate with a certain inclination angle is installed between the two slots. A filter screen is provided on the filter plate. This invention, with its first fixing blocks, filter plate, and filter screen, allows waste liquid to enter through the inlet on one side of the recovery tank, pass through the filter plate between the two first fixing blocks, and then flow into the bottom of the recovery tank through the filter screen on the filter plate. This effectively filters impurities in the waste liquid in one pass, saving multiple impurity removal processes and achieving energy savings.

[0004] However, this NMP recovery device still has the following problems: 1. NMP waste liquid often contains solid impurities (such as lithium battery electrode fragments and polymer residues). After prolonged use, the filter screen of the NMP recovery device is prone to forming a stubborn filter cake due to impurity accumulation, leading to clogging of the sieve holes. Frequent shutdowns for disassembly and cleaning are required, interrupting the recovery process (each shutdown takes 30-60 minutes) and affecting processing and recovery efficiency; 2. The inner wall and bottom of the existing NMP recovery device are prone to adhering with layers of reaction residues (such as salt crystals and organic polymers). Due to the lack of an efficient cleaning mechanism, long-term accumulation leads to a decrease in the heat transfer efficiency of the heating components, increasing energy consumption. Furthermore, the existing cleaning method requires manual cleaning after shutdown, affecting the normal operation of the NMP recovery device and impacting recovery efficiency. Utility Model Content

[0005] This utility model addresses the shortcomings of current technology by providing an NMP recycling device, aiming to solve the technical problems of existing NMP recycling devices lacking automatic cleaning functions, having low processing and recycling efficiency, and high energy consumption.

[0006] The technical solution adopted by this utility model to achieve the above objectives is as follows: An NMP recovery device includes a recovery tank and a cooling tank installed on one side of the recovery tank. A connecting pipe is provided between the recovery tank and the cooling tank. A lifting mechanism is provided on the top of the recovery tank. The lifting mechanism is provided with a filter plate for solid-liquid separation filtration, and the filter plate is disposed inside the recovery tank. The recovery tank is also provided with an inner wall cleaning mechanism, a stirring mechanism, a heating component, and an impurity recovery component. The filter plate is provided with a first cleaning component.

[0007] As a further improvement, the top of the recycling bin is provided with a cover plate, and the cover plate is detachably connected to the recycling bin; the lifting mechanism includes at least two lifting cylinders, which are arranged opposite to each other on the cover plate, and the driving end of the lifting cylinder is inserted into the recycling bin and fixedly connected to the filter plate.

[0008] As a further improvement, the filter plate is provided with a filter screen, and the first cleaning component includes a plurality of ultrasonic vibrator components, which are fixed on the filter screen in a spaced manner. As a further improvement, the impurity recovery component is disposed on the cover plate. The impurity recovery component includes at least one adsorption fan. The adsorption fan is disposed and fixed on the cover plate. The adsorption fan has an adsorption port and an outlet. Both the adsorption port and the outlet are provided with a first connecting pipe. The first connecting pipe of the adsorption port passes through the cover plate and is disposed above the filter plate. The first connecting pipe of the adsorption port is also provided with two opposing second connecting pipes. Each of the second connecting pipes is provided with an adsorption hood.

[0009] As a further improvement, the adsorption hood is provided with a swing brush assembly, which includes multiple rotating rods and a first driving member. The multiple rotating rods are arranged in an array inside the opening of the adsorption hood. The first driving member is disposed and fixed on the outer wall of the adsorption hood. One end of one of the rotating rods extends through the outer wall of the adsorption hood and is connected to the driving end of the first driving member. Each rotating rod is also provided with a gear, and the gears are meshed with each other. Each rotating rod is provided with a brush, and the brush faces the filter screen.

[0010] As a further improvement, the filter screen is provided with a central hole, and the stirring mechanism includes a second driving member and a stirring blade assembly. The second driving member is disposed and fixed at the center position of the cover plate. The driving end of the second driving member is provided with a rotating shaft, which passes through the central hole. The stirring blade assembly is disposed below the rotating shaft, and the stirring blade assembly includes multiple stirring blades arranged at intervals.

[0011] As a further improvement, the recycling bin is provided with an installation cavity, and the heating assembly includes a heating tube assembly and a temperature sensor. The heating tube assembly is disposed in the installation cavity, and the temperature sensor is disposed on the inner wall of the recycling bin.

[0012] As a further improvement, the bottom of the recycling bin is a conical structure; the inner wall cleaning mechanism includes multiple ultrasonic vibrator assemblies and a scraping assembly. The multiple ultrasonic vibrator assemblies are respectively disposed on the outer side wall and bottom of the recycling bin. The scraping assembly includes two horizontal bars and one vertical bar arranged opposite each other. One end of each of the two horizontal bars is respectively disposed on and fixed to the rotating shaft, and the vertical bar is disposed on and fixed to the bottom of the rotating shaft. The other end of each of the two horizontal bars is provided with a first vertical bar. The vertical bar is provided with two diagonal bars. The first vertical bar and the diagonal bars are each provided with a mounting part. The mounting part is provided with a scraper. The scraper is respectively attached to the inner wall of the recycling bin.

[0013] As a further improvement, symmetrical fixing blocks are installed on both sides inside the cooling box, and a first cooling plate, a second cooling plate, and a third cooling plate are installed between the two fixing blocks from top to bottom. The first cooling plate, the second cooling plate, and the third cooling plate are all provided with perforated mesh. Symmetrical cooling fins are installed at both ends inside the cooling box.

[0014] As a further improvement, the recycling tank is provided with a liquid inlet, a water inlet is provided below the liquid inlet, and a waste outlet is provided at the bottom of the recycling tank; the cooling tank is provided with a liquid outlet; and control valves are provided for the liquid inlet, water inlet, waste outlet, and liquid outlet.

[0015] Compared with the prior art, the NMP recovery device provided in this embodiment of the present invention has at least one of the following technical effects: 1. This utility model achieves multiple cleaning processes by using an ultrasonic vibrator assembly on the filter screen to break down stubborn impurity layers, and a swing brush assembly inside the adsorption hood to loosen impurities on the filter screen surface. This prevents filter cake formation and reduces clogging. An adsorption fan is also used to adsorb and remove solid impurities from the filter screen. The position of the filter plate can be adjusted by a lifting mechanism. During filtration, the plate is located below the liquid inlet, and during cleaning, it rises to below the adsorption hood. This allows the filter screen cleaning process to be completed without stopping the machine, improving processing and recycling efficiency and increasing the daily processing capacity by more than 25%.

[0016] 2. By installing ultrasonic vibrator components on the outer wall and bottom of the recycling bin, a pair of inner walls are vibrated and cleaned. This, combined with a scraper component on the rotating shaft, forms a dual cleaning process of "vibration + scraping". The scraper on the scraper component adheres to the inner wall and conical bottom of the bin and rotates synchronously with the rotating shaft to remove the impurity layer on the inner wall. This reduces the impact of the impurity layer, improves the heat transfer efficiency of the heating tube, and reduces the continuous working time of the heating tube, thereby reducing energy consumption. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the NMP recovery device in this embodiment; Figure 2 This is a schematic diagram of the filter plate in this embodiment; Figure 3 This is a schematic diagram of the adsorption cover in this embodiment. Detailed Implementation

[0019] The following description is only a preferred embodiment of the present invention and does not limit the scope of protection of the present invention.

[0020] For examples, see the appendix. Figures 1-3 An NMP recovery device 1 includes a recovery tank 2 and a cooling tank 3 installed on one side of the recovery tank 2. A connecting pipe 4 is provided between the recovery tank 2 and the cooling tank 3 for communication between the recovery tank 2 and the cooling tank 3. A lifting mechanism 5 is provided on the top of the recovery tank 2. The lifting mechanism 5 is provided with a filter plate 6 for solid-liquid separation filtration, and the filter plate 6 is disposed inside the recovery tank 2. The recovery tank 2 is also provided with an inner wall cleaning mechanism 7, a stirring mechanism 8, a heating component 9, and an impurity recovery component 10. The filter plate 6 is provided with a first cleaning component 11.

[0021] The top of the recycling tank 2 is provided with a cover plate 20, which is detachably connected to the recycling tank 2. The detachable connection can be either a snap-fit ​​connection or a threaded connection. The lifting mechanism 5 includes at least two lifting cylinders 50, which are preferably electric cylinders. The lifting cylinders 50 are arranged opposite to each other on the cover plate 20, and the drive end of the lifting cylinder 50 is inserted into the recycling tank 2 and fixedly connected to the filter plate 6. The filter plate 6 is positioned below the liquid inlet when filtering and screening, and is positioned above the liquid inlet when performing impurity recovery. The lifting mechanism 5 is used to control the position of the filter plate 6 and, in conjunction with the impurity recovery component 10, enables automatic cleaning of the filter plate 6 without stopping the machine and without affecting the normal operation of the NMP recovery device 1.

[0022] The filter plate 6 is provided with a filter screen 60. The first cleaning component 11 includes a plurality of ultrasonic vibrator components 110. The plurality of ultrasonic vibrator components 110 are fixed on the filter screen 60 in a spaced manner. The first cleaning component 11 is used to vibrate and remove the stubborn impurity layer on the filter screen 60, to prevent the sieve holes of the filter screen 60 from becoming clogged due to long-term use, and to ensure the inflow and supply of waste liquid. The impurity recovery component 10 is disposed on the cover plate 20. The impurity recovery component 10 includes at least one adsorption fan 100. The adsorption fan 100 is disposed and fixed on the cover plate 20. The adsorption fan 100 is provided with an adsorption port and an outlet. Both the adsorption port and the outlet are provided with a first connecting pipe 101. The first connecting pipe 101 of the adsorption port passes through the cover plate 20 and is disposed above the filter plate 6. The first connecting pipe 101 of the adsorption port is also provided with two opposing second connecting pipes. Each of the second connecting pipes is provided with an adsorption cover 102. The impurity recovery component 10 is used to automatically recover solid impurities on the filter screen 60. The first connecting pipe 101 on the outlet is connected to the external housing.

[0023] The adsorption cover 102 is provided with a swing brush assembly 103, which includes multiple rotating rods 103a and a first driving member 103b. The multiple rotating rods 103a are arranged in an array inside the opening of the adsorption cover 102. The first driving member 103b is disposed and fixed on the outer wall of the adsorption cover 102. The first driving member 103b is preferably a corrosion-resistant and high-temperature resistant motor. One end of one of the rotating rods 103a passes through the outer wall of the adsorption cover 102 and is connected to the driving end of the first driving member 103b. Each rotating rod 103a is also provided with a gear 103c, and the gears 103c are meshed with each other. Each of the rotating rods 103a is equipped with a brush 103d, which faces the filter screen 60. The brush 103d is used to sweep and loosen impurities on the filter screen 60, thereby ensuring the cleaning effect of the filter screen 60. When the filter screen 60 is in contact with the brush 103d, the first driving member 103b drives the rotating rod 103a to repeatedly rotate forward and backward, causing the brush 103d to swing. The brush 103d sweeps the filter screen 60, and in conjunction with the synchronous action of the adsorption fan 100, it performs adsorption and recovery of solid impurities, preventing the sieve holes of the filter screen 60 from becoming blocked, and ensuring the flow and supply of waste liquid into the stirring zone.

[0024] The filter screen 60 has a central hole. The stirring mechanism 8 includes a second driving component 80 and a stirring blade assembly 81. The second driving component 80 is a motor. The second driving component 80 is set and fixed at the center position of the cover plate 20. The driving end of the second driving component 80 is provided with a rotating shaft 82. The rotating shaft 82 passes through the central hole. The stirring blade assembly 81 is set below the rotating shaft 82. The stirring blade assembly 81 includes multiple stirring blades arranged at intervals. The stirring mechanism 8 is used for stirring, thereby ensuring the reaction effect of waste liquid and reagent and improving the effect of subsequent recycling treatment.

[0025] The recycling tank 2 is provided with an installation cavity. The heating component 9 includes a heating tube assembly 90 and a temperature sensor 91. The heating tube assembly 90 is disposed in the installation cavity, and the temperature sensor 91 is disposed on the inner wall of the recycling tank 2. The heating component 9 is used to heat or keep warm to ensure the efficiency and effect of the reagent mixing reaction and improve the subsequent recycling efficiency and effect of NMP.

[0026] The bottom of the recycling bin 2 has a conical structure. The inner wall cleaning mechanism 7 includes multiple ultrasonic vibrator assemblies 70 and scraping assemblies 71. The multiple ultrasonic vibrator assemblies 70 are respectively disposed on the outer side wall and bottom of the recycling bin 2. The ultrasonic vibrator assemblies 70 are fixed to the recycling bin 2 by welding, snap-fit, or threaded connection. Each ultrasonic vibrator assembly 110 and ultrasonic vibrator assembly 70 includes a shell, an ultrasonic transducer, an amplitude transformer, and a vibrating head. The ultrasonic vibrator assembly 110 and ultrasonic vibrator assembly 70 are used to convert electrical energy into mechanical vibration energy, thereby vibrating and removing stubborn impurity layers on the filter screen 60 and the inner wall of the recycling bin 2. Together with the scraping assembly 71, they form a multi-layer cleaning structure to reduce the impact of impurity layers on the processing efficiency of the recycling bin 2. The scraping assembly 71 includes two horizontal bars 710 and one vertical bar 711 arranged opposite each other. One end of each of the two horizontal bars 710 is respectively set and fixed on the rotating shaft 82, and the vertical bar 711 is set and fixed at the bottom of the rotating shaft 82; the other end of each of the two horizontal bars 710 is provided with a first vertical bar 712, and the vertical bar 711 is provided with two diagonal bars 713. The first vertical bar 712 and the diagonal bars 713 are each provided with a mounting part, and the mounting part is provided with a scraper 714. The mounting part and the scraper 714 are detachably connected. The detachable connection can be one of plug-in connection, snap-fit ​​connection or threaded connection. The scraper 714 is respectively attached to the inner wall of the recycling box 2. The scraper 714 is a corrosion-resistant and high-temperature resistant scraper 714. The scraper 714 is used to scrape and remove the impurity layer formed on the inner wall and bottom to ensure the cleanliness of the inner wall, reduce the influence of the impurity layer on the temperature, thereby ensuring the temperature transfer efficiency and effect when the heating tube is heated later, and reducing the energy consumption of the heating tube group 90.

[0027] Symmetrical fixing blocks 30 are installed on both sides inside the cooling box 3. A first cooling plate 31, a second cooling plate 32, and a third cooling plate 33 are installed between the two fixing blocks 30 from top to bottom. The first cooling plate 31, the second cooling plate 32, and the third cooling plate 33 are all provided with perforated mesh. Symmetrical cooling fins 34 are installed at both ends inside the cooling box 3. The cooling fins 34 are used to provide cooling, thereby lowering the temperature on the perforated mesh.

[0028] The recycling tank 2 is provided with a liquid inlet 21, a water inlet 22 below the liquid inlet 21, and a waste outlet 23 at the bottom of the recycling tank 2; the cooling tank 3 is provided with a liquid outlet 35; each of the liquid inlet 21, water inlet 22, waste outlet 23, and liquid outlet 35 is equipped with a control valve, which can be either a solenoid valve or a mechanical valve. The water inlet 22 is used for the entry of water during cleaning, the liquid inlet 21 is used for the injection of waste liquid, the waste outlet is used for the discharge of waste, and the liquid outlet 35 is used for the discharge of recycled liquid. The scraper 714 and brush 103d are preferably made of acid and alkali resistant materials (such as polytetrafluoroethylene), which are suitable for the corrosive environment of NMP recycling, extending their service life to more than 6 months and reducing the frequency of component replacement.

[0029] This invention utilizes an ultrasonic vibrator assembly on the filter screen to break down stubborn impurity layers, combined with a oscillating brush assembly within the adsorption hood to loosen impurities on the filter screen surface, achieving multiple cleaning processes. This prevents filter cake formation and reduces clogging. An adsorption fan further adsorbs and removes solid impurities from the filter screen. A lifting mechanism adjusts the filter plate position; it is positioned below the liquid inlet during filtration and rises below the adsorption hood during cleaning, allowing for filter screen cleaning without stopping the machine. This improves processing and recycling efficiency, increasing daily processing capacity by over 25%. Ultrasonic vibrators on the outer wall and bottom of the recycling tank provide vibration cleaning to the inner wall. Combined with a scraper assembly on the rotating shaft, this creates a dual "vibration + scraping" cleaning process. The scraper on the scraper assembly adheres to the inner wall and conical bottom of the tank, rotating synchronously with the shaft to remove the impurity layer on the inner wall. This reduces the impact of the impurity layer, improving the heat transfer efficiency of the heating element and reducing its continuous operating time, thus lowering energy consumption.

[0030] This utility model is not limited to the above-described embodiments. Other NMP recovery devices obtained by using the same or similar structures or devices as the above-described embodiments of this utility model are all within the protection scope of this utility model.

Claims

1. An NMP recovery device, characterized in that: The NMP recovery device includes a recovery tank and a cooling tank installed on one side of the recovery tank. A connecting pipe is provided between the recovery tank and the cooling tank. A lifting mechanism is provided on the top of the recovery tank. The lifting mechanism is provided with a filter plate for solid-liquid separation filtration, and the filter plate is disposed inside the recovery tank. The recovery tank is also provided with an inner wall cleaning mechanism, a stirring mechanism, a heating component, and an impurity recovery component. The filter plate is provided with a first cleaning component.

2. The NMP recovery device according to claim 1, characterized in that: The top of the recycling bin is provided with a cover plate, which is detachably connected to the recycling bin. The lifting mechanism includes at least two lifting cylinders, which are arranged opposite to each other on the cover plate. The driving end of the lifting cylinder is inserted into the recycling bin and fixedly connected to the filter plate.

3. The NMP recovery device according to claim 2, characterized in that: The filter plate is provided with a filter screen, and the first cleaning component includes multiple ultrasonic vibrator components, which are fixed to the filter screen in a spaced manner.

4. The NMP recovery device according to claim 3, characterized in that: The impurity recovery component is disposed on the cover plate. The impurity recovery component includes at least one adsorption fan. The adsorption fan is disposed and fixed on the cover plate. The adsorption fan has an adsorption port and an outlet. Both the adsorption port and the outlet are provided with a first connecting pipe. The first connecting pipe of the adsorption port passes through the cover plate and is disposed above the filter plate. The first connecting pipe of the adsorption port is also provided with two opposing second connecting pipes. Each of the second connecting pipes is provided with an adsorption hood.

5. The NMP recovery device according to claim 4, characterized in that: The adsorption hood is equipped with a swing brush assembly, which includes multiple rotating rods and a first driving member. The multiple rotating rods are arranged in an array inside the opening of the adsorption hood. The first driving member is disposed and fixed on the outer wall of the adsorption hood. One end of one of the rotating rods passes through the outer wall of the adsorption hood and is connected to the driving end of the first driving member. Each rotating rod is also equipped with a gear, and the gears mesh with each other. Each rotating rod is also equipped with a brush, and the brush faces the filter screen.

6. The NMP recovery apparatus according to claim 5, characterized in that: The filter screen has a central hole, and the stirring mechanism includes a second driving member and a stirring blade assembly. The second driving member is set and fixed at the center of the cover plate. The driving end of the second driving member has a rotating shaft that passes through the central hole. The stirring blade assembly is set below the rotating shaft and includes multiple spaced stirring blades.

7. The NMP recovery apparatus according to claim 6, characterized in that: The recycling bin has an installation cavity. The heating assembly includes a heating tube assembly and a temperature sensor. The heating tube assembly is located inside the installation cavity, and the temperature sensor is located on the inner wall of the recycling bin.

8. The NMP recovery apparatus according to claim 7, characterized in that: The bottom of the recycling bin is conical. The inner wall cleaning mechanism includes multiple ultrasonic vibrator assemblies and a scraping assembly. The multiple ultrasonic vibrator assemblies are respectively disposed on the outer wall and bottom of the recycling bin. The scraping assembly includes two horizontal bars and one vertical bar arranged opposite each other. One end of each of the two horizontal bars is respectively disposed on and fixed to the rotating shaft, and the vertical bar is disposed on and fixed to the bottom of the rotating shaft. The other end of each of the two horizontal bars is provided with a first vertical bar. The vertical bar is provided with two diagonal bars. The first vertical bar and the diagonal bars are provided with mounting parts. Each mounting part is provided with a scraper. The scraper is respectively attached to the inner wall of the recycling bin.

9. The NMP recovery apparatus according to claim 8, characterized in that: Symmetrical fixing blocks are installed on both sides of the interior of the cooling box. A first cooling plate, a second cooling plate, and a third cooling plate are installed between the two fixing blocks from top to bottom. The first cooling plate, the second cooling plate, and the third cooling plate are all provided with perforated mesh. Symmetrical cooling fins are installed at both ends of the interior of the cooling box.

10. The NMP recovery apparatus according to claim 9, characterized in that: The recycling tank is provided with a liquid inlet, a water inlet below the liquid inlet, and a waste outlet at the bottom of the recycling tank; the cooling tank is provided with a liquid outlet; and control valves are provided for the liquid inlet, water inlet, waste outlet, and liquid outlet.

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