A kind of intermediate material taking device for the lower valve of polymerization reactor in polyamide research and development production process

Abstract

The application relates to the field of chemical equipment, and discloses a middle material taking device for a lower valve of a polymerization reactor in a polyamide research and development and production process, which comprises a discharge flange arranged at the bottom of a reactor, the discharge flange is coaxially connected with a sampling valve assembly through a flange sleeve, a sampling cavity and a through cavity are arranged in the flange sleeve, the sampling valve assembly is sequentially provided with a valve body, a valve core and a thrust seat along an axial direction, one end of the valve body is provided with a flange face and is fastened with a lower flange face of the flange sleeve through bolts, the valve core is fixedly connected with the thrust seat through a guide rod, the guide rod is upwardly arranged in the through cavity and penetrates into the inside of the reactor, a sealing ring is arranged on the outer periphery of the thrust seat, a cleaning interface is arranged on the side wall of the flange sleeve, a disconnection flange and a discharge pipe are further sequentially arranged below the flange sleeve, the disconnection flange is laterally matched with the lower flange face of the flange sleeve, and the top end of the discharge pipe is coaxially fixed with the inside flange face of the disconnection flange.

Description

Technical Field

[0001] This application belongs to the field of chemical equipment technology, specifically relating to a lower valve intermediate material handling device for a polymerization reactor used in the research and production of polyamide. Background Technology

[0002] Reactors commonly used in the field of chemical technology include tubular reactors and batch reactors. Tubular reactors are usually continuous flow reactors. Since continuous flow reactions theoretically have the same reaction time for all reactants, the product quality stability is better than that of discontinuous reactions.

[0003] Because of its long flow path, the tubular continuous flow reactor requires a pump upstream of the pipeline to provide the power for material flow. Excessively long and thin pipelines can lead to high internal pressure, placing high demands on the delivery pump. On the other hand, thicker pipelines result in poor turbulence and uneven material dispersion.

[0004] Amide polymerization is the process by which diamines and diacids undergo dehydration and polymerization at high temperatures to produce polyamides. Existing polymerization processes are generally divided into two types: batch processes, typically carried out in reactors, and continuous processes, typically carried out in pipeline reactors. Batch processes suffer from inherent drawbacks, including quality fluctuations. Continuous processes usually utilize pipelines, which require long pipelines and a large footprint to ensure sufficient reaction time to achieve the appropriate molecular weight. Furthermore, pipelines typically employ static mixing devices, which, as the polymerization process progresses and the molecular weight of the materials increases, can easily lead to scaling and other problems. Utility Model Content

[0005] This application provides a lower valve intermediate material feeding device for a polymerization reactor used in the research and development and production of polyamide, in order to solve the technical problems of quality fluctuation in intermittent processes and scaling in continuous processes.

[0006] The technical solution adopted in this application is as follows:

[0007] A material handling device for a lower valve in a polymerization reactor used in the research and production of polyamide includes a discharge flange located at the bottom of the reactor. The discharge flange is coaxially connected to a sampling valve assembly via a flange sleeve. The flange sleeve has a sampling chamber and a through chamber. The sampling valve assembly has a valve body, a valve core, and a thrust seat arranged sequentially along the axial direction. One end of the valve body has a flange face, which is fastened to the lower flange face of the flange sleeve by bolts. The valve core is fixed to the thrust seat via a guide rod. The guide rod passes upward from the through chamber to the inside of the reactor. A sealing ring is provided on the outer periphery of the thrust seat. A cleaning interface is provided on the side wall of the flange sleeve. A detachable flange and a discharge pipe are arranged sequentially below the flange sleeve. The detachable flange is laterally fitted with the lower flange face of the flange sleeve. The top end of the discharge pipe is coaxially fixed with the inner flange face of the detachable flange.

[0008] By adopting the above technical solution, the discharge flange is located at the top of the device and is rigidly connected coaxially to the bottom of the reactor. Bolt holes are provided on the outer edge of the flange for fastening with bolts on the flange face of the flange sleeve.

[0009] Optionally, the valve core has a rectangular prism shape in cross section, with the long side of the rectangular prism perpendicular to the guide rod and connected by an interference fit.

[0010] Optionally, the flange sleeve is formed by connecting two flange sleeve sections with concentric threads, and the inner wall of the lower flange sleeve is provided with a return groove corresponding to the upper flange sleeve.

[0011] By adopting the above technical solution, the flange sleeve is divided into upper and lower sections, which are connected by concentric threads and positioned and locked at the return groove. The outer diameter covers and forms the outer wall of the sampling cavity, and the through cavity is continuously connected along the axial direction.

[0012] A cleaning interface with an external thread is arranged radially on the side wall of the sampling chamber and connected to it.

[0013] Optionally, the cleaning interface is in the form of an external threaded connector, with the cleaning interface protruding radially outward and forming an annular transition space between it and the wall of the sampling chamber.

[0014] Optionally, the detachable flange includes an upper flange body and a lower flange body, which are hinged together by a semi-cylindrical pin.

[0015] By adopting the above technical solution, the disassembly flange is located at the lower end of the flange sleeve and is coaxial with the discharge pipe.

[0016] Optionally, the discharge pipe extends downward from the inner flange face of the disassembly flange, and the outer wall of the discharge pipe is provided with a groove for holding the detachable discharge pipe.

[0017] By adopting the above technical solution, the discharge pipe is coaxially connected to the inner flange face of the disassembly flange and descends to the external sampling equipment.

[0018] Optionally, the valve core is symmetrically provided with limit keys, which are radially embedded in the corresponding keyways on the inner wall of the valve body.

[0019] Optionally, the bottom sidewall of the through cavity is connected to the sampling cavity via a one-way valve.

[0020] Optionally, a limit shoulder is provided radially at the bottom of the valve body, and a stop portion is provided at the bottom of the thrust seat, with the limit shoulder and the stop portion engaging.

[0021] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0022] 1. The sampling function is integrated into the bottom of the reactor, eliminating the need for traditional long pipelines, significantly reducing the plant floor space, and making the equipment layout more compact;

[0023] 2. The coaxial, straight sampling channel design reduces fluid resistance, lowers the pressure requirements on the delivery pump, and extends the pump's service life;

[0024] 3. The radial cleaning interface, combined with the annular transition space, enables online cleaning without stopping the machine, which can quickly flush away polymer residues, prevent scaling, and improve production continuity.

[0025] 4. The design of the detachable flange and grooved discharge pipe allows for on-site assembly, disassembly, and replacement by a single person without special tools, greatly reducing maintenance downtime. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 This is a three-dimensional schematic diagram of the present application;

[0028] Figure 2 This is a cross-sectional view of the sampling channel opening mode in this application;

[0029] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0030] Figure 4 This is a cross-sectional view of the sampling channel in closed mode according to this application;

[0031] Figure 5 for Figure 4 Enlarged view of a section at point B in the middle;

[0032] Figure 6 This is a three-dimensional schematic diagram of the valve core and valve body in this application.

[0033] 1. Discharge flange; 2. Flange sleeve; 21. Sampling chamber; 22. Through chamber; 3. Sampling valve assembly; 31. Valve body; 311. Limit shoulder; 32. Valve core; 33. Thrust seat; 331. Stop; 4. Guide rod; 5. Sealing ring; 6. Cleaning interface; 7. Disconnect flange; 8. Discharge pipe; 81. Slot; 9. Semi-cylindrical pin; 10. Limit key; 11. Keyway; 12. Check valve. Detailed Implementation

[0034] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0036] A lower valve intermediate sampling device for a polymerization reactor used in the research and production of polyamide includes a discharge flange 1 located at the bottom of the reactor. The discharge flange 1 is coaxially connected to a sampling valve assembly 3 via a flange sleeve 2. The flange sleeve 2 has a sampling chamber 21 and a through chamber 22. The sampling valve assembly 3 has a valve body 31, a valve core 32, and a thrust seat 33 arranged sequentially along the axial direction. One end of the valve body 31 has a flange face, which is fastened to the lower flange face of the flange sleeve 2 by bolts. The valve core 32 is fixed to the thrust seat 33 via a guide rod 4. The guide rod 4 extends upward from the through chamber 22 to the inside of the reactor. A sealing ring 5 is provided on the outer periphery of the thrust seat 33. A cleaning interface 6 is provided on the side wall of the flange sleeve 2. A detachable flange 7 and a discharge pipe 8 are arranged sequentially below the flange sleeve 2. The detachable flange 7 is laterally fitted with the lower flange face of the flange sleeve 2. The top end of the discharge pipe 8 is coaxially fixed with the inner flange face of the detachable flange 7.

[0037] Furthermore, the bottom sidewall of the through cavity 22 is connected to the sampling cavity 21 via a one-way valve 12.

[0038] Furthermore, a limiting shoulder 311 is radially provided at the bottom of the valve body 31, and a stop portion 331 is provided at the bottom of the thrust seat 33, with the limiting shoulder 311 and the stop portion 331 engaging in a stop-stop cooperation.

[0039] like Figures 1 to 6 As shown, after the reaction is completed and the set temperature and pressure are reached, the control system sends a "sampling" command to the actuator. The actuator pushes the guide rod 4 downwards vertically, causing the valve core 32 to move downwards synchronously. When the bottom end of the valve core 32 abuts against the thrust seat 33, the valve core 32 continues to press down, achieving a tight coaxial fit between the thrust seat 33 and the valve body 31. At this time, the discharge flange 1 at the bottom of the reactor forms a channel connection with the sampling chamber 21. When the sampling channel is opened, the stop part 331 of the thrust seat 33 cooperates with the limiting shoulder 311 of the valve body 31 to prevent excessive movement, while the sealing ring 5 abuts against the inner wall of the valve body 31 to achieve rapid sealing. The high-temperature polymer fluid enters the sampling chamber 21 from the reactor, flows into the through chamber 22 through the one-way valve 12, then flows into the discharge pipe 8 through the disassembly flange, and finally flows out to the sampling bottle, completing the sample collection. After the data collection is completed, the actuator reverses its drive, and the guide rod 4 and valve core 32 move upward to their initial positions; the one-way valve 12 is closed, completely cutting off the fluid connection between the sampling chamber 21 and the through chamber 22.

[0040] In this embodiment, preferably, the actuator is a handle or a pneumatic cylinder, and the actuator is connected to the guide rod 4.

[0041] Furthermore, the valve core 32 has a rectangular prism shape in cross section, and the long side of the rectangular prism is perpendicular to the guide rod 4 and connected by an interference fit.

[0042] like Figure 6 As shown, the long side of the rectangular valve core 32 is inserted into the guide hole of the valve body 31 through an interference fit. The rectangular structure prevents the valve core 32 from rotating or jamming during the opening and closing process. In actual operation, the valve core 32 moves smoothly up and down within the chamber under the precise positioning of the guide rod 4.

[0043] Furthermore, the flange sleeve 2 is formed by connecting the upper and lower flange sleeves 2 through concentric threads, and the inner wall of the lower flange sleeve 2 is provided with a return groove corresponding to the upper flange sleeve 2.

[0044] like Figure 1 , Figure 2 as well as Figure 4 As shown, during on-site assembly, the upper flange sleeve 2 is first screwed into the concentric thread of the lower flange sleeve 2 to achieve coarse positioning. Then, after the return grooves of the two sleeves are aligned, they automatically engage with the stop structure. Coaxial self-locking can be achieved without secondary alignment or additional fasteners, ensuring accurate assembly position and vibration resistance.

[0045] In this embodiment, the stop structure is not specifically limited.

[0046] Furthermore, the cleaning interface 6 is in the form of an external threaded connector, and the cleaning interface 6 protrudes radially outward and forms an annular transition space between it and the wall of the sampling chamber 21.

[0047] like Figure 1 , Figure 2 as well as Figure 4 As shown, after sampling, there is no need to disassemble the sampling valve assembly 3; high-pressure cleaning medium can be injected into the radially arranged external thread cleaning interface 6. The cleaning medium enters through the cleaning interface 6, flushes the inner wall of the sampling chamber 21, carries away dissolved or loose residual polymer particles, and discharges them through components such as the one-way valve 12, the disconnect flange 7, and the discharge pipe 8, ensuring that there is no scale buildup in the chamber.

[0048] Furthermore, the detachable flange 7 includes an upper flange body and a lower flange body, which are hinged together by a semi-cylindrical pin 9.

[0049] like Figure 1 , Figure 2 as well as Figure 4As shown, when repairing or replacing the discharge pipe 8 on site, the operator only needs to loosen the semi-cylindrical pin 9, pull down the lower flange body to separate it from the upper flange body, and then quickly remove the pipe section for maintenance. The pipe section can then be reinstalled and reset using the pin and interference fit surface. The entire process can be completed by a single person without special tools.

[0050] Furthermore, the discharge pipe 8 extends downward from the inner flange face of the detachable flange 7, and the outer wall of the discharge pipe 8 is provided with a groove 81 for holding the detachable discharge pipe 8.

[0051] like Figure 1 , Figure 2 as well as Figure 4 As shown, the discharge pipe 8 is inserted into the lower flange and fixed. After completion, it can be directly put into production after being locked by the disassembly flange 7. This structure can still maintain a stable connection under high temperature and high pressure conditions, preventing secondary leakage.

[0052] Furthermore, the valve core 32 is symmetrically provided with limit keys 10, which are radially embedded in the corresponding keyway 11 on the inner wall of the valve body 31.

[0053] like Figure 6 As shown, the wedge-shaped limiting key 10 is radially embedded in the inner wall of the valve body 31 corresponding to the keyway 11. During the movement of the valve core 32, the limiting key 10 slides along the keyway 11 and maintains the same direction, preventing the valve core 32 from rotating, effectively improving the sealing performance and service life of the valve core 32.

[0054] Working principle:

[0055] When sampling is required after the reaction is complete, the control system drives the guide rod 4 to move the valve core 32 downward to press against the thrust seat 33, opening the sampling channel. The high-temperature, high-viscosity material inside the reactor directly enters the sampling chamber 21 and flows out along the coaxial discharge pipe 8 to the external sampling container. After sampling, the valve core 32 moves back to its initial position, and the sealing ring 5 of the thrust seat 33 re-fits tightly against the valve core 32, completing the complete isolation of the reactor body. During online cleaning, cleaning medium is injected through the cleaning interface 6, flushed through the sampling chamber 21, and then discharged. The modules are tightly fitted together through structures such as threaded self-locking, quick-release slots 81, and wedge-shaped limits, enabling rapid on-site assembly and disassembly, cleaning, anti-clogging, and long-term stable operation.

[0056] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0057] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0058] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A bottom valve intermediate material receiving device for a polymerization reactor used in the research and production of polyamide, comprising a discharge flange (1) located at the bottom of the reactor, characterized in that: The discharge flange (1) is coaxially connected to the sampling valve assembly (3) via a flange sleeve (2). The flange sleeve (2) contains a sampling chamber (21) and a through chamber (22). The sampling valve assembly (3) is axially arranged with a valve body (31), a valve core (32), and a thrust seat (33). One end of the valve body (31) has a flange face, which is fastened to the lower flange face of the flange sleeve (2) by bolts. The valve core (32) is connected to the thrust seat via a guide rod (4). 33) Fixed connection, the guide rod (4) passes through the through cavity (22) upward to the inside of the reactor, the thrust seat (33) is provided with a sealing ring (5) on the outer periphery, the side wall of the flange sleeve (2) is provided with a cleaning interface (6), and the flange sleeve (2) is also provided with a disassembly flange (7) and a discharge pipe (8) in sequence below the flange sleeve (2). The disassembly flange (7) is laterally matched with the lower flange surface of the flange sleeve (2), and the top end of the discharge pipe (8) is coaxially fixed with the inner flange surface of the disassembly flange (7).

2. The material handling device according to claim 1, characterized in that: The valve core (32) has a rectangular column shape in cross section, and the long side of the rectangular column is perpendicular to the guide rod (4) and connected by an interference fit.

3. The material handling device according to claim 1, characterized in that: The flange sleeve (2) is formed by connecting two flange sleeves (2) with concentric threads. The inner wall of the lower flange sleeve (2) is provided with a return groove corresponding to the upper flange sleeve (2).

4. The material handling device according to claim 1, characterized in that: The cleaning interface (6) is an external threaded connector. The cleaning interface (6) protrudes radially outward and forms an annular transition space with the wall of the sampling chamber (21).

5. The material handling device according to claim 1, characterized in that: The detachable flange (7) includes an upper flange body and a lower flange body, which are hinged by a semi-cylindrical pin (9).

6. The material handling device according to claim 1, characterized in that: The discharge pipe (8) extends downward from the inner flange face of the detachable flange (7), and the outer wall of the discharge pipe (8) is provided with a groove (81) for holding the detachable discharge pipe (8).

7. The material handling device according to claim 1, characterized in that: The valve core (32) is symmetrically provided with limit keys (10), and the limit keys (10) are radially embedded in the corresponding keyway (11) on the inner wall of the valve body (31).

8. The material handling device according to claim 1, characterized in that: The bottom sidewall of the through cavity (22) is connected to the sampling cavity (21) via a one-way valve (12).

9. The material handling device according to claim 1, characterized in that: The valve body (31) has a limiting shoulder (311) radially provided at the bottom, and the thrust seat (33) has a stop part (331) at the bottom, and the limiting shoulder (311) and the stop part (331) stop and cooperate.

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