A device and method for measuring and controlling the boundary liquid level of a delaminating device for recovering carbon fiber solvent

Abstract

The present application relates to the technical field of carbon fiber chemical equipment, and in particular to a device for measuring and controlling the boundary liquid level of a carbon fiber solvent recovery device, the device comprising a delaminator, a delamination interface control unit, and a diversion regulating balancer, the diversion balancing regulator comprising a housing, a piston body, and a cylinder for driving the piston body to reciprocate, the housing being provided with a first adjustment hole, a second adjustment hole, and a third adjustment hole all connected to the water outlet, the piston body being provided with a first water inlet hole connected to the first adjustment hole, and a second water inlet hole connected to the second adjustment hole, the delamination interface control unit being electrically connected to a DCS control system for detecting the delamination interface height, thereby controlling the air intake of the cylinder to adjust the delamination interface height. The device simplifies the process flow of solvent separation, reduces the risk of acrylonitrile leakage, and ensures worker safety; through intelligent detection and mechanical lock control, the delamination interface is precisely controlled, thereby improving the quality and efficiency of solvent recovery.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon fiber chemical equipment, and in particular relates to a device and method for measuring and controlling a boundary liquid level of a layerer for recovering a carbon fiber solvent. Background Art

[0002] The solvent recovery device of the carbon fiber precursor production line is used to separate and purify the components of the aqueous solution containing acrylonitrile and dimethyl sulfoxide produced by the polymerization device in the de-aeration and concentration process and the washing process, and the dimethyl sulfoxide aqueous solution produced by the spinning device in the coagulation bath process and water washing process to obtain dimethyl sulfoxide and acrylonitrile.

[0003] The solvent recovery device mainly includes an acrylonitrile removal system, a three-stage dehydration system, a dimethyl sulfoxide purification system, a high-boiling-point removal system, and a solvent storage system. Among them, the acrylonitrile removal system mainly consists of a plate distillation tower, a heat exchanger, a separator, a container for storing separated water and recovering acrylonitrile, and a pump for conveying the medium. The working principle of the acrylonitrile removal system is to adopt a negative pressure distillation process. Since the boiling point of acrylonitrile is much lower than that of water and dimethyl sulfoxide, most of the gaseous acrylonitrile and water vapor are distilled from the upper part of the distillation tower as light components of the distillation tower, condensed into liquid form by heat exchange in the condenser, and enter the separator. Due to the characteristics of acrylonitrile having a lower density than water and being slightly soluble in water, acrylonitrile and water are separated by static stratification. The acrylonitrile in the upper layer of the separator and the water in the lower layer flow into their respective storage containers.

[0004] Since both acrylonitrile and water in the separator flow into respective storage containers through overflow, it is very important to control the interface between acrylonitrile and water in the separator.

[0005] At present, the interface of the delamination device equipped with the solvent recovery device in the carbon fiber industry is manually controlled. Figure 1 The separator 1 is provided with a liquid inlet 11, a water outlet 12, an overflow hole 14, and an air pressure balance hole 13. The water outlet 12 is provided with a first conduit 33, a first hose 30 connected to the first conduit 33, and a three-way pipe joint 36. The three-way pipe joint 36 is provided with a third hose 32, a water phase receiving tank 35 connected to the third hose 32, and a three-way pipe joint 36. The air pressure balance hole 13 is provided with a second conduit 34 and a second hose 31 connected to the second conduit 34. The first hose 30 and the third hose 32 are respectively connected to the straight end of the three-way pipe joint 36, and the second hose 31 is connected to the right-angle end of the three-way pipe joint 36. The height of the first hose 30 is consistent with that of the third hose 32.

[0006] A mixture of acrylonitrile and water flows into the stratifier 1 through the liquid inlet 11. The acrylonitrile and water are allowed to stand and separate in the stratifier 1. The upper layer, acrylonitrile liquid, flows into the acrylonitrile storage tank through the overflow hole 14. The lower layer, water, flows into the first hose 30 and the third hose 32 through the water outlet 12. To prevent the acrylonitrile liquid from accidentally flowing out of the water outlet 12 and the water from accidentally flowing out of the overflow hole 14, the first hose 30 and the third hose 32 are raised or lowered by manually moving the three-way pipe joint 36 to adjust the height of the stratification interface.

[0007] The existing method of manually controlling the height adjustment of the hose requires ensuring that sufficient adjustment margins are reserved for the first hose 30, the second hose 31 and the third hose 32. In workshop production, it not only takes up a large space, but the hoses are also consumable parts and need to be regularly inspected and replaced. Acrylonitrile is a flammable liquid. Once a leak occurs, its vapor and air can form an explosive mixture and release toxic gases, directly affecting the life safety of workshop workers. In addition, manually adjusting the height of the stratification interface not only increases the labor intensity of the operator, but also has low efficiency. In particular, when the stratification interface is not controlled in time, it is very easy to cause the stratification interface to fluctuate beyond the safe range, thereby causing serious consequences such as solution overflow and uneven mixing, posing a severe challenge to the recovery safety and quality of the solution. Its potential risks cannot be ignored.

[0008] Therefore, in order to solve the above technical problems, exploring and breaking through the existing layered recovery method and improving the quality and safety of solution recovery have become technical issues that urgently need to be solved. Summary of the Invention

[0009] In order to overcome the limitations of existing technologies, reduce the fluctuation of the floating value of the delamination interface, improve the solvent recovery quality of the carbon fiber precursor production line, simplify the process flow of solution separation, improve the solvent recovery efficiency, reduce the labor intensity of operators, and ensure the safety of workshop workers.

[0010] The present application provides a device and method for measuring and controlling the boundary liquid level of a delamination device for recovering carbon fiber solvents, which adopts the following technical solutions:

[0011] A device for measuring and controlling the boundary liquid level of a carbon fiber solvent recovery layer, comprising a layer, a diverter regulating balancer connected to the layer, the layer being provided with an inlet hole for an acrylonitrile aqueous solution, a water outlet hole connected to the diverter regulating balancer, an air pressure balance hole and an overflow hole for diverting acrylonitrile, the diverter balance regulator comprising a housing, a piston assembly slidably connected to the housing and a driving member driving the piston assembly to move back and forth up and down, the housing being provided with a first adjusting hole, a second adjusting hole and a third adjusting hole in sequence from high to low along the height direction of the peripheral wall, the first adjusting hole, the second adjusting hole and the third adjusting hole being all connected to the water outlet hole, the piston assembly comprising a piston body, the piston body dividing the interior of the housing into an upper cavity and a lower cavity, the piston body being provided with a plurality of A pressure relief hole is connected to the upper cavity and the lower cavity, a first water inlet hole is provided on the piston body to connect the first positioning hole and the inner cavity of the box body, and a second water inlet hole is provided on the piston body to connect the second positioning hole and the inner cavity of the box body. The height difference between the first water inlet hole and the second water inlet hole is H1, and the height difference between the first positioning hole and the second positioning hole is H2. The diameters of the first water inlet hole, the second water inlet hole, the first positioning hole, the second positioning hole and the third positioning hole are all d, and H1-H2>d. A stratification interface control unit is provided on the stratifier for detecting the height of the stratification interface. The stratification interface control unit is electrically connected to a DCS control system, and the DCS control system is used to control the driving member to drive the moving stroke of the piston body.

[0012] With this technical solution, the layer interface control unit detects the height of the layer interface and transmits a signal to the DCS control system. The DCS then controls the vertical movement of the piston body by the actuator based on the position of the layer interface. When H1-H2>d, when the first water inlet hole in the piston body is connected to the first adjustment hole, the second water inlet hole is prevented from connecting to the second adjustment hole, achieving mechanical interlocking. The water outlet is connected to the first, second, and third adjustment holes. When the interface of the acrylonitrile solution is above the upper limit of the set fluctuation range, the piston moves upward until the bottom of the piston is above the third adjustment hole. The lower layer of water quickly enters the diverter and adjusts the balancer, lowering the interface height. When the interface reaches the set fluctuation range, the piston moves downward to the second water inlet and connects with the second adjustment hole. Conversely, when the interface of the acrylonitrile solution is below the lower limit of the set fluctuation range, the piston moves downward to the first water inlet and connects with the first adjustment hole. The acrylonitrile solution in the diverter begins to accumulate. When the interface reaches the set fluctuation range, the piston moves upward to the second water inlet and connects with the second adjustment hole. Through intelligent detection and mechanical interlocking control, the interface height can be adjusted, reducing worker labor intensity and improving the quality and efficiency of solvent recovery. The diverter and adjuster replaces traditional hoses and water phase receiving tanks, simplifying the solution separation process, reducing the possibility of acrylonitrile leakage, and ensuring the safety of workshop workers.

[0013] Optionally, the piston assembly further includes a push rod for pushing the piston body to reciprocate, the cross-section of the piston body along its movement direction is H-shaped, the push rod is fixed to the side of the piston body close to the top of the box body, and the driving member is a cylinder.

[0014] By adopting the above technical solution, the H-shaped cross-section of the piston body reduces the weight of the piston body and the processing cost, and the control of the movement position of the piston body is achieved by controlling the air intake volume of the cylinder.

[0015] Optionally, the layered interface control unit includes a sleeve provided in the chamber of the delaminator and a float slidably connected to the sleeve, wherein the axis of the sleeve is parallel to the axis of the delaminator, and the density ρ of the float is in the range of 900 kg / m 3 <ρ<1000kg / m 3 , the bushing is electrically connected to the DCS control system.

[0016] By adopting the above technical solution, the density of the floating block is between that of acrylonitrile and water, so that the floating block is stable in the vicinity of the stratified interface; the floating block is slidably connected to the casing to prevent the floating block from flipping and moving left and right, making it easier to detect the position of the floating block, reducing the error in the floating block position detection, and improving the accuracy of the stratified interface position detection.

[0017] Optionally, the floating block includes a bag cover and a magnetic ring bonded to the bag cover, and the sleeve includes a magnetic conductive tube and a corrosion-resistant layer provided on the surface of the magnetic conductive tube.

[0018] By adopting the above technical solution, the position height of the float is detected through the action of the magnetic ring and the magnetic tube, which is electrically connected to the DCS control system through the magnetic tube. The surface of the magnetic tube is provided with a corrosion-resistant layer to prevent the magnetic tube from chemically reacting in the acrylonitrile aqueous solution, thereby improving the detection accuracy of the stratified interface position.

[0019] Optionally, the material of the magnetic tube is iron, and the corrosion-resistant layer is polyester fiber electroplated on the surface of the sleeve.

[0020] By adopting the above technical solution, the polyester fiber has very strong corrosion resistance and low cost. The polyester fiber is coated on the surface of the casing to protect the service life of the casing.

[0021] Optionally, the sac sleeve includes several liquid sacs, and two adjacent liquid sacs are detachably connected and connected on the same plane. The liquid sac is provided with an injection nozzle and a plug for closing the injection nozzle. The magnetic ring is bonded to the inner side of the liquid sac. The liquid sac material is polyester fiber, and the liquid sac thickness is 0.05 to 0.1 mm.

[0022] By adopting the above technical solution, several liquid capsules are assembled into a capsule sleeve, which reduces the risk of leakage of a single liquid capsule and causing erroneous position detection, and improves the accuracy of layered interface detection.

[0023] Optionally, a convex column is provided on one side of the liquid capsule and a column cap is provided on a side away from the convex column, the column cap is threadedly connected to the convex column, a connecting soft belt is provided on the column cap, and the connecting soft belt is rotatably connected to the column cap.

[0024] By adopting the above technical solution, the liquid capsules are connected through a detachable structure, which makes it easy to replace the liquid capsules in case of leakage. At the same time, multiple liquid capsules work together, and leakage or failure of one liquid capsule will not affect the position measurement results of the layered interface; the connecting soft belt is connected to the column cap to facilitate the connection of adjacent liquid capsules, and the connecting soft belt is rotatably connected to the column cap to avoid twisting of the connecting soft belt when the column cap is screwed on the boss, thereby reducing the possibility of loosening of the liquid capsule connection.

[0025] Optionally, the cross-section of the liquid sac along the axial direction of the sleeve is rhombus-shaped.

[0026] By adopting the above technical solution, the cross section of the liquid sac is diamond-shaped, which improves the stability of the liquid in the liquid sac.

[0027] Optionally, the end of the sleeve close to the acrylonitrile is detachably mounted on the layerer, the installation height of the sleeve is higher than the height of the overflow hole, the insertion position of the other end of the sleeve is lower than the height of the water outlet hole, and a block is provided at the bottom of the sleeve to prevent the float from detaching from the sleeve.

[0028] By adopting the above technical solution, if the insertion position of the other end of the sleeve is higher than the height of the water outlet, when the stratified interface drops to the water outlet, it cannot be detected in time, which may easily cause acrylonitrile to mistakenly enter the diversion adjustment balancer. The block is used to prevent the float from detaching from the sleeve, avoiding interruption of the sleeve signal transmission.

[0029] A method for measuring and controlling the boundary liquid level of a delamination device for recovering carbon fiber solvents, comprising: step S1: a mixed solvent flows into the delamination device along the liquid inlet hole and is statically delaminated; step S2: the delamination interface control unit detects the position of the float block and outputs the result to the DCS control system to monitor the position of the delamination interface, and controls the air intake of the cylinder according to the position of the delamination interface, thereby controlling the delamination interface by moving the piston up and down; step S3: when the movement position of the float block is within the fluctuation range, the second adjustment hole is connected to the second water inlet hole, and the first adjustment hole is connected to the third adjustment hole. The positioning hole is not connected to the inner cavity of the box body, and the fluctuation float value interval is the 1 / 3 section in the middle of the distance from the water outlet to the overflow hole; when the moving position of the float block is higher than the upper limit of the fluctuation float value interval, the piston body moves upward, and the third positioning hole is directly connected to the inner cavity of the box body, and the first positioning hole and the second positioning hole are not connected to the inner cavity of the box body; when the moving position of the float block is lower than the lower limit of the fluctuation float value interval, the piston body moves downward, and the first positioning hole is connected to the first water inlet hole, and the second positioning hole and the third positioning hole are not connected to the inner cavity of the box body.

[0030] By adopting the above technical solution, the optimal position interval of the float block is set to 1 / 3 of the distance between the overflow hole and the water outlet hole (the water outlet hole is located at 1 / 5 of the total height of the tank, the overflow hole is located at 4 / 5 of the total height of the tank, and the fluctuating floating value interval is located at 2 / 5 to 3 / 5 of the total height of the tank). Through intelligent detection and mechanical interlocking control, real-time monitoring and adjustment are carried out to accurately control the stratification interface. Once the position change of the stratification interface is detected, the DCS control system will quickly adjust the stratification interface to the optimal position interval according to the fluctuating floating value interval, reducing the need for manual intervention, reducing the labor intensity of workers, and avoiding solvent recovery errors and safety hazards caused by human operation, thereby improving the purity of solvent separation at the stratification interface and improving the quality and efficiency of solvent recovery.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. Through intelligent detection and mechanical interlocking control, real-time monitoring and adjustment, precise control of the layering interface, eliminating workers' labor intensity, and improving the quality and efficiency of solvent recovery;

[0033] 2. The split flow regulating balancer replaces the traditional hose structure and water phase receiving tank, simplifying the solvent separation process, reducing the risk of acrylonitrile leakage, and ensuring worker safety;

[0034] 3. The height difference between the first water inlet and the second water inlet is H1, and the height difference between the first adjustment hole and the second adjustment hole is H2, and H1>H2. When the first water inlet and the first adjustment hole in the piston body are connected, the second water inlet and the second adjustment hole are prevented from being connected, thereby achieving mechanical interlocking and improving the quality of solvent recovery;

[0035] 4. Several liquid capsules are assembled into a capsule sleeve, which reduces the risk of incorrect position detection caused by leakage of a single liquid capsule and improves the accuracy of layered interface detection. The setting of the stopper on the sleeve can prevent the float block from detaching from the sleeve and avoid interruption of sleeve signal transmission;

[0036] 5. The connecting soft belt is connected to the column cap to facilitate the connection of adjacent liquid capsules. The connecting soft belt is rotatably connected to the column cap to prevent the connecting soft belt from twisting when the column cap is screwed onto the boss, thereby reducing the possibility of loosening of the liquid capsule connection.

[0037] 6. Since the density of the bag material is greater than that of acrylonitrile, acrylonitrile and helium are filled in a certain proportion in the float, so that the density of the float is between the density of acrylonitrile and water, which makes it easier for the magnetic tube to detect the magnetic ring on the float to detect the layered interface, thus avoiding solvent recovery errors and safety hazards caused by manual operation;

[0038] 7. The device has the advantages of unique structure, safety, reliability, high efficiency, green environmental protection, and intelligent measurement and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the layered interface adjustment structure of a traditional layerer;

[0040] Figure 2 2. It is a schematic structural diagram of a delamination device recovery device according to an embodiment;

[0041] Figure 3 2 is a schematic structural diagram of a flow shunt regulating balancer in an embodiment;

[0042] Figure 4 is a schematic structural diagram of a layered interface control unit in an embodiment;

[0043] Figure 5 2. It is a structural diagram of a floating block in an embodiment;

[0044] Figure 6 2 is a schematic structural diagram of the liquid capsule in the embodiment;

[0045] Figure 7 yes Figure 6 AA cross-sectional view.

[0046] In the figure: 1. Stratifier; 11. Liquid inlet; 12. Water outlet; 13. Air pressure balance hole; 14. Overflow hole; 15. Stratified interface control unit; 151. Casing; 1511. Magnetic tube; 1512. Corrosion-resistant layer; 1513. Stopper; 152. Float; 1521. Bag cover; 15211. Liquid bag; 15212. Liquid injection nozzle; 15213. Plug; 15214. Boss; 15215. Column cap; 15216. Connecting soft belt; 1522. Magnetic ring; 16. DCS control system; 17. Flange; 18. Tank; 19. Tank cover; 2. Diverter adjustment and balance 1. Casing; 21. First adjustment hole; 212. Second adjustment hole; 213. Third adjustment hole; 214. Upper cavity; 215. Lower cavity; 22. Piston assembly; 221. Piston body; 2211. Support plate; 22111. Pressure relief hole; 2212. Ring body; 2213. First water inlet hole; 2214. Second water inlet hole; 222. Push rod; 23. Cylinder; 24. Air hole; 25. Box cover; 30. First hose; 31. Second hose; 32. Third hose; 33. First conduit; 34. Second conduit; 35. Water phase receiving tank; 36. Three-way pipe joint. DETAILED DESCRIPTION

[0047] The following is combined with Figure 2-7 This application is described in further detail.

[0048] The present application discloses a device and method for measuring and controlling the boundary liquid level of a delamination device for recovering carbon fiber solvent.

[0049] Reference Figure 2 and Figure 3 ,

[0050] A device for measuring and controlling the interface liquid level of a carbon fiber solvent recovery layer, comprising a layer 1, a diverter regulating balancer 2, and a DCS control system 16. The layer 1 is provided with a layer interface control unit 15, which is electrically connected to the DCS control system 16, enabling the diverter regulating balancer 2 to adjust the layer interface height to achieve separation of acrylonitrile-water solution. The diverter regulating balancer 2 replaces the traditional hose and aqueous phase receiving tank 35, simplifying the solution separation process, reducing the possibility of acrylonitrile leakage, and ensuring the safety of workshop workers. Through intelligent detection and mechanical interlocking control, the layer interface height can be adjusted, eliminating workers' labor intensity and improving the quality and efficiency of solvent recovery.

[0051] Specifically,

[0052] The stratifier 1 is provided with a liquid inlet 11, a water outlet 12, a pressure balance hole 13, and an overflow hole 14. The liquid inlet 11 is used to receive the acrylonitrile aqueous solution condensed by heat exchange from the condenser. The water outlet 12 and the pressure balance hole 13 are respectively connected to the diverter and regulator balancer 2. The water outlet 12 flows into the diverter and regulator balancer 2 to collect water below the stratification interface in the stratifier 1. The overflow hole 14 is used to recover the acrylonitrile above the stratification interface.

[0053] The stratifier 1 includes a tank barrel 18 and a tank cover 19 fixed to the tank barrel, an air pressure balance hole 13 is opened on the tank cover 19, a water outlet hole 12 is opened on the peripheral wall of the tank barrel 18, located at 1 / 5 of the total height of the tank barrel 18, and an overflow hole 14 is opened at 4 / 5 of the total height of the tank barrel 18.

[0054] The diversion regulating balancer 2 includes a box body 21 and a box cover 25 that closes the box body 21, a piston assembly 22 and a driving member, the driving member is a cylinder 23, the piston assembly 22 is arranged inside the box body 21, the piston assembly 22 includes a piston body 221 and a push rod 222, the piston body 221 is slidably connected to the inner wall of the box body 21, the cylinder 23 drives the push rod 222 to realize the up and down reciprocating sliding of the piston body 221 in the box body 21, and the DCS control system 16 controls the stroke of the piston body 221 by controlling the air intake of the cylinder 23.

[0055] Specifically,

[0056] A first positioning hole 211, a second positioning hole 212 and a third positioning hole 213 are sequentially opened on the box body 21 along the height direction of the box body 21 from high to low. The first positioning hole 211, the second positioning hole 212 and the third positioning hole 213 are all connected to the water outlet hole 12 at the lower end of the stratifier 1. The first positioning hole 211 is arranged at 2 / 3 of the distance from the water outlet hole 12 to the overflow hole 14, the third positioning hole 213 is arranged at 1 / 3 of the distance from the water outlet hole 12 to the overflow hole 14, and the second positioning hole 212 is arranged between the first positioning hole 211 and the second positioning hole 212.

[0057] A first water inlet hole 2213 and a second water inlet hole 2214 are provided on the piston body 221. The diameters of the first water inlet hole 2213, the second water inlet hole 2214, the first positioning hole 211, the second positioning hole 212 and the third positioning hole 213 are all d. The height difference between the first water inlet hole 2213 and the second water inlet hole 2214 is H1, the height difference between the first positioning hole 211 and the second positioning hole 212 is H2, and H1-H2>d. When the first water inlet hole 2213 in the piston body 221 is connected with the first positioning hole 211, the second water inlet hole 2214 is prevented from being connected with the second positioning hole 212, thereby realizing mechanical interlocking.

[0058] When the stratification interface position of the acrylonitrile aqueous solution is higher than the fluctuation float setting interval, the piston body 221 moves upward until the bottom surface of the piston body 221 is higher than the third adjustment hole 213, and the lower layer of water quickly enters the diversion regulating balancer 2 to lower the stratification interface height. When the stratification interface reaches the set fluctuation float range, the piston body 221 moves downward to the second water inlet hole 2214 and connects with the second adjustment hole 212. Conversely, when the stratification interface position of the acrylonitrile aqueous solution is lower than the set lower limit of the fluctuation float range, the piston body 221 moves downward to the first water inlet hole 2213 of the piston body 221 and connects with the first adjustment hole 211. The acrylonitrile aqueous solution in the stratifier 1 begins to be stored. When the stratification interface reaches the set fluctuation float range, the piston body 221 moves upward to the second water inlet hole 2214 and connects with the second adjustment hole 212.

[0059] In order to reduce the weight of the piston body 221 and save processing costs, the cross-section of the piston body 221 along its movement direction is H-shaped. The piston body 221 is a welded part, consisting of a ring body 2212 and a support plate 2211. The support plate 2211 is welded to the middle of the ring body 2212. The support plate 2211 divides the box body 21 into an upper cavity 214 and a lower cavity 215. In order to balance the air pressure in the upper cavity 214 and the lower cavity 215, several pressure relief holes 22111 are opened on the support plate 2211.

[0060] The box cover 25 is further provided with an air hole 24 for communicating with the air pressure balance hole 13 of the stratifier 1 .

[0061] Reference Figure 2 and Figure 4 ,

[0062] The tank cover 19 is provided with a layered interface control unit 15, which includes a sleeve 151 and a float 152. The density ρ of the float 152 is in the range of 900 kg / m 3 <ρ<1000kg / m 3 Float 152 is capable of floating at the interface between acrylonitrile and water. A flange 17 is provided on the tank lid 19, and a sleeve 151 is fixed to the flange 17, with the axis of the sleeve 151 parallel to the axis of the tank barrel 18. Float 152 is inserted into the sleeve 151 to prevent it from flipping or moving left or right. This facilitates detection of the position of float 152, reduces errors in position detection, and improves the accuracy of detection of the interface. The other end of the sleeve 151 is inserted below the height of the water outlet 12. If the sleeve 151 is inserted above the height of the water outlet 12, when the interface drops to the water outlet 12, it cannot be detected in time, which can easily cause acrylonitrile to accidentally enter the diverter and regulator balancer 2. To prevent float 152 from escaping from the sleeve 151, a stopper 1513 is provided at the bottom of the sleeve 151.

[0063] Specifically,

[0064] Reference Figure 5 and Figure 6 Float 152 comprises a housing 1521 and a magnetic ring 1522, which is bonded to the inner wall of housing 1521. Housing 151 comprises a magnetic tube 1511 and a corrosion-resistant layer 1512. Housing 1521 is made of polyester fiber and is filled with 30% to 70% acrylonitrile liquid, with the remainder filled with helium. This ensures that leakage of the helium / acrylonitrile liquid from housing 1521 will not contaminate the solution in separator 1. Housing 1521 is 0.1 to 0.2 mm thick. Magnetic tube 1511 is made of iron. Corrosion-resistant layer 1512 is a protective layer of polyester fiber electroplated on the magnetic conductor, protecting the surface of the magnetic conductor from corrosion and maintaining solvent separation purity. The position of float 152 is monitored by the interaction of magnetic ring 1522 and magnetic tube 1511, which is electrically connected to DCS control system 16 via magnetic tube 1511, enabling detection of the position of float 152.

[0065] Reference Figure 5 and Figure 7 In order to reduce the possibility of leakage of the capsule 1521 during operation, the capsule 1521 includes four liquid capsules 15211. Two adjacent liquid capsules 15211 are connected on the same plane in a detachable manner, which facilitates the replacement of the leaking liquid capsule 15211. If one liquid capsule 15211 leaks or fails, it will not affect the position measurement result of the stratified interface, thereby improving the accuracy of stratified interface detection.

[0066] The liquid capsule 15211 is provided with a liquid injection nozzle 15212 and a plug 15213 , and the plug 15213 is used to close the liquid injection nozzle 15212 to prevent acrylonitrile from flowing out and affecting the detection accuracy of the layered interface.

[0067] A protruding column 15214 is provided on one side of the liquid capsule 15211, and a column cap 15215 is provided on the side away from the protruding column 15214. The column cap 15215 is threadedly connected to the protruding column 15214. A connecting soft belt 15216 is provided on the column cap 15215. The connecting soft belt 15216 is rotatably connected to the column cap 15215. The column cap 15215 of the liquid capsule 15211 is connected to the protruding column 15214 of the adjacent liquid capsule 15211 to realize the splicing of four liquid capsules 15211. The connecting soft belt 15216 is connected to the column cap 15215 to facilitate the connection of adjacent liquid capsules 15211. The connecting soft belt 15216 is rotatably connected to the column cap 15215 to prevent the connecting soft belt 15216 from twisting when the column cap 15215 is screwed on the protruding column 15214, thereby reducing the possibility of the liquid capsule 15211 being loosened. In order to improve the stability of the liquid in the liquid capsule 15211, the cross-section of the liquid capsule 15211 is diamond-shaped.

[0068] The working principle of the layering device boundary liquid level measurement and control device for carbon fiber solvent recovery provided in the present application is as follows: the position of the floating block 152 floating on the layering interface in the layering device 1 is detected by the layering interface control unit 15, and the position of the layering interface is indirectly detected. The air intake of the cylinder 23 is controlled according to the position of the layering interface. The cylinder 23 drives the piston body 221 to move back and forth up and down in the box body 21 through the push rod 222 to control the height of the connection position between the water outlet 12 and the layering adjustment balancer.

[0069] The present application provides a method for measuring and controlling the boundary liquid level of a delamination device for recovering carbon fiber solvent, which is divided into three steps:

[0070] In the first step, the acrylonitrile aqueous solution flows into the stratifier 1 along the liquid inlet 11 and is statically stratified. According to the density difference between acrylonitrile and water, the acrylonitrile with a smaller density is located at the upper layer of the stratification interface, and the water with a larger density is located at the lower layer of the stratification interface;

[0071] In the second step, the float 152 floats on the stratification interface. The stratification interface control unit 15 determines the position of the stratification interface by detecting the position of the float 152 and outputs the position data to the DCS control system 16 to monitor the position of the stratification interface. The air intake of the cylinder 23 is controlled according to the position of the stratification interface, thereby controlling the vertical movement of the piston body 221 to achieve position control of the stratification interface in the stratifier 1.

[0072] In the third step, when the moving position of the float block 152 is within the fluctuation float value range, the second adjustment hole 212 is connected to the second water inlet hole 2214, and the first adjustment hole 211 and the second adjustment hole 212 are not connected to the inner cavity of the box body 21. The fluctuation float value range is 1 / 3 of the distance between the water outlet hole 12 and the overflow hole 14 (the water outlet hole 12 is located at 1 / 5 of the total height of the barrel 191, the overflow hole 14 is located at 4 / 5 of the total height of the barrel 191, and the fluctuation float value range is located at 2 / 5 to 3 / 5 of the total height of the barrel 191). ; When the moving position of the float 152 is higher than the upper limit of the fluctuation float value, the piston body 221 moves upward until the third adjustment hole 213 is directly connected to the inner cavity of the box body 21. At this time, the first adjustment hole 211 and the second adjustment hole 212 are not connected to the inner cavity of the box body 21; when the moving position of the float 152 is lower than the lower limit of the fluctuation float value, the piston body 221 moves downward until the first adjustment hole 211 is connected to the first water inlet hole 2213. At this time, the second adjustment hole 212 and the third adjustment hole 213 are not connected to the inner cavity of the box body 21.

[0073] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and is susceptible to numerous variations. Any simple modifications, equivalent variations, and modifications to the above embodiments based on the technical essence of the present invention are deemed to fall within the scope of protection of the present invention.

Claims

1. A device for measuring and controlling the boundary liquid level of a delamination device for recovering carbon fiber solvent, characterized by: The invention comprises a stratifier (1), a flow diversion regulating balancer (2) connected to the stratifier (1), wherein the stratifier (1) is provided with a liquid inlet (11) for an acrylonitrile aqueous solution, a water outlet (12) communicating with the flow diversion regulating balancer (2), an air pressure balancing hole (13), and an overflow hole (14) for diverting acrylonitrile. The flow-dividing balance regulator comprises a housing (21), a piston assembly (22) slidably connected to the housing (21), and a driving member for driving the piston assembly (22) to move up and down. A first adjustment hole (211), a second adjustment hole (212), and a third adjustment hole (213) are sequentially opened on a peripheral wall of the housing (21) from high to low in a height direction. The first adjustment hole (211), the second adjustment hole (212), and the third adjustment hole (213) are all connected to the water outlet (12). The piston assembly (22) comprises a piston body (221), wherein the piston body (221) divides the interior of the box body (21) into an upper cavity (214) and a lower cavity (215), and the piston body (221) is provided with a plurality of pressure relief holes (22111) communicating with the upper cavity (214) and the lower cavity (215), and the piston body (221) is provided with a first water inlet hole (2213) communicating with the first position adjustment hole (211) and the inner cavity of the box body (21), and the piston body (221) is also provided with a plurality of pressure relief holes (22111) communicating with the upper cavity (214) and the lower cavity (215). The second positioning hole (212) and the second water inlet hole (2214) in the inner cavity of the box body (21), the height difference between the first water inlet hole (2213) and the second water inlet hole (2214) is H1, the height difference between the first positioning hole (211) and the second positioning hole (212) is H2, the diameters of the first water inlet hole (2213), the second water inlet hole (2214), the first positioning hole (211), the second positioning hole (212), and the third positioning hole (213) are all d, and H1-H2>d, The delamination device (1) is provided with a delamination interface control unit (15) for detecting the height of the delamination interface. The delamination interface control unit (15) is electrically connected to a DCS control system (16). The DCS control system (16) is used to control the movement stroke of the piston body (221) driven by the driving member.

2. The device for measuring and controlling the boundary liquid level of a delamination device for recovering carbon fiber solvent according to claim 1, characterized in that: The piston assembly (22) further includes a push rod (222) for pushing the piston body (221) to move back and forth. The cross-section of the piston body (221) along its movement direction is H-shaped. The push rod (222) is fixed to the side of the piston body (221) close to the top of the box body (21). The driving member is a cylinder (23).

3. The device for measuring and controlling the boundary liquid level of a delamination device for recovering carbon fiber solvent according to claim 2, characterized in that: The layered interface control unit (15) comprises a sleeve (151) disposed in the chamber of the stratifier (1) and a float (152) slidably connected to the sleeve (151), wherein the axis of the sleeve (151) is parallel to the axis of the stratifier (1), and the density ρ of the float (152) ranges from 900 kg / m 3 <ρ<1 000 kg / m 3 The bushing (151) is electrically connected to the DCS control system (16).

4. The device for measuring and controlling the boundary liquid level of a delamination device for recovering carbon fiber solvent according to claim 3, characterized in that: The floating block (152) includes a bag cover (1521) and a magnetic ring (1522) bonded to the bag cover (1521); the sleeve (151) includes a magnetic tube (1511) and a corrosion-resistant layer (1512) arranged on the surface of the magnetic tube (1511).

5. The device for measuring and controlling the boundary liquid level of a delaminating device for recovering carbon fiber solvent according to claim 4, characterized in that: The material of the magnetic tube (1511) is iron, and the corrosion-resistant layer (1512) is polyester fiber electroplated on the surface of the sleeve (151).

6. The device for measuring and controlling the boundary liquid level of a delaminating device for recovering carbon fiber solvent according to claim 5, characterized in that: The sac sleeve (1521) includes a plurality of liquid sacs (15211), and two adjacent liquid sacs (15211) are connected on the same plane via a detachable connection. The liquid sac (15211) is provided with a liquid injection nozzle (15212) and a plug (15213) for closing the liquid injection nozzle (15212). The magnetic ring (1522) is bonded to the inner side of the liquid sac (15211). The material of the liquid sac (15211) is polyester fiber, and the thickness of the liquid sac (15211) is 0.05 to 0.1 mm.

7. The device for measuring and controlling the boundary liquid level of a delaminating device for recovering carbon fiber solvent according to claim 6, characterized in that: A convex column (15214) is provided on one side of the liquid sac (15211) and a column cap (15215) is provided on the side away from the convex column (15214). The column cap (15215) is threadedly connected to the convex column (15214). A connecting soft belt (15216) is provided on the column cap (15215), and the connecting soft belt (15216) is rotatably connected to the column cap (15215).

8. The device for measuring and controlling the boundary liquid level of a delaminating device for recovering carbon fiber solvent according to claim 7, characterized in that: The cross-section of the liquid sac (15211) along the axial direction of the sleeve (151) is rhombus-shaped.

9. The device for measuring and controlling the boundary liquid level of a delamination device for recovering carbon fiber solvent according to claim 3, characterized in that: One end of the sleeve (151) close to the acrylonitrile is detachably mounted on the separator (1), and the mounting height is higher than the height of the overflow hole (14). The insertion position of the other end of the sleeve (151) is lower than the height of the water outlet hole (12). A stopper (1513) is provided at the bottom of the sleeve (151) for preventing the floating block (152) from detaching from the sleeve (151).

10. A method for measuring and controlling the boundary liquid level of a delaminator for carbon fiber solvent recovery, using the delaminator boundary liquid level measuring and controlling device according to claim 3, characterized in that: Here are the steps: S1. The mixed solvent flows into the stratifier (1) along the liquid inlet (11) and is allowed to stand for stratification; S2. The layered interface control unit (15) detects the position of the float (152) and outputs the position to the DCS control system (16) to monitor the position of the layered interface and control the air intake of the cylinder (23) according to the position of the layered interface. The layered interface is controlled by moving the piston body (221) up and down; S3. When the moving position of the float (152) is within the fluctuation float value range, the second position adjustment hole (212) is connected to the second water inlet hole (2214), the first position adjustment hole (211) and the third position adjustment hole (213) are not connected to the inner cavity of the box (21), and the fluctuation float value range is 1 / 3 of the distance between the water outlet hole (12) and the overflow hole (14); when the moving position of the float (152) is higher than the upper limit of the fluctuation float value range, the piston body (221) moves upward, and the The third position adjustment hole (213) is directly connected to the inner cavity of the box body (21), and the first position adjustment hole (211) and the second position adjustment hole (212) are not connected to the inner cavity of the box body (21); when the moving position of the floating block (152) is lower than the lower limit of the fluctuation floating value range, the piston body (221) moves downward, the first position adjustment hole (211) is connected to the first water inlet hole (2213), and the second position adjustment hole (212) and the third position adjustment hole (213) are not connected to the inner cavity of the box body (21).

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