Polymerization kettle for suspension process production of PVC

Abstract

The utility model belongs to the field of polymerization cavity, disclose a polymerization kettle for production PVC of suspension method, include: reaction cavity, first anti -blocking spare and second anti -blocking spare, first anti -blocking spare is used to preliminary tearing and dispersing to the big piece material from reaction cavity, second anti -blocking spare is used to further crushing and dredging to the received material, and through its rotation to material exert shear force, reduce the apparent viscosity of material, thereby accelerate the overall flow of material in the discharge pipe, through linkage spare connection first anti -blocking spare, second anti -blocking spare integration into a whole, make first anti -blocking spare with second anti -blocking spare drive simultaneously, realized the initiative tearing and preliminary dispersing to material, will the concentrated flow be split into a plurality of strands, be favorable to reduce the occurrence of " material arch " phenomenon, after material enters second anti -blocking spare, to the material of pre -treatment carry out depth crushing and fine dredging, be favorable to further improve the anti -blocking capacity.

Description

Technical Field

[0001] This disclosure pertains to the field of polymerization reaction chambers, and specifically relates to polymerization reactors for the suspension production of PVC. Background Technology

[0002] Polyvinyl chloride (PVC), one of the world's largest-volume general-purpose plastics, has a well-established suspension polymerization process. In this process, vinyl chloride monomer (VCM) undergoes polymerization in a polymerization reactor equipped with a stirring and cooling system to produce PVC resin particles. After the reaction, the high-solids-content, high-viscosity PVC slurry in the reactor is discharged through the bottom outlet to subsequent processes.

[0003] The commonly used production process is to use vinyl chloride monomer as raw material and produce PVC resin in a polymerization reactor using the suspension method. In order to improve production efficiency and economic benefits, it is necessary to maximize the output in a single production cycle and reduce the energy consumption and cost of subsequent drying and other processes.

[0004] Therefore, it is essential to maximize the concentration of effective products per unit volume of reactants during production. In PVC suspension polymerization, it is necessary to increase the solid content of the slurry in the polymerization reactor, i.e., increase the proportion of PVC solid particles in the total volume of the slurry. This increased solid content leads to a sharp decrease in the density and spacing of the solid particles within the slurry, resulting in a significant enhancement of the frictional and cohesive forces between particles and between particles and the liquid phase. These enhanced internal molecular forces macroscopically manifest as a substantial increase in the viscosity of the material, making it highly viscous and prone to agglomeration.

[0005] First, because PVC resin granules are viscous and have poor flowability, a "material arching" blockage phenomenon can occur. Since PVC slurry is a non-Newtonian fluid with a high solids content, when the material converges from the wide bottom of the vessel to the narrow outlet pipe, the friction between particles and the cohesive force within the material easily cause it to form a stable mechanical arch structure above the outlet, i.e., a "material arch" or "bridging," thus slowing down the material flow rate.

[0006] For example, in the polymerization reactor for PVC production by suspension process with application number 2023281351.0, an anti-clogging and crushing component is installed at the discharge port to alleviate clogging by crushing large pieces of material. However, because a single crushing component has a certain volume, after being installed at the already narrow discharge port, it will further occupy and reduce the effective flow cross-sectional area of ​​the material, thus hindering the smooth flow of the material. Utility Model Content

[0007] In view of the shortcomings of the prior art, the purpose of this disclosure is to provide a polymerization reactor for the suspension process of PVC production, which solves the problems of poor discharge caused by the easy formation of "material arches", large pieces of material sticking to the reactor clogging the discharge port, and the slow flow caused by the high viscosity of the slurry.

[0008] The objective of this disclosure can be achieved through the following technical solutions:

[0009] A polymerization reactor for PVC production by suspension polymerization includes: a reaction chamber, a first anti-clogging component, and a second anti-clogging component;

[0010] The discharge pipe of the reaction chamber is provided with a first anti-blocking component, and a linkage component is connected between the first anti-blocking component and the second anti-blocking component;

[0011] The first anti-blocking component is configured to drive the second anti-blocking component to rotate synchronously via the linkage component when rotating;

[0012] The first anti-blocking component is used to initially tear and disperse large pieces of material from the reaction chamber, and guide the dispersed material to the second anti-blocking component;

[0013] The second anti-blocking component is used to further crush and guide the received material, and applies shear force to the material by rotating it, thereby reducing the apparent viscosity of the material and accelerating the overall flow rate of the material in the discharge pipe.

[0014] In some disclosures, the first anti-clogging component includes a drainage section having a longitudinal section perpendicular to the rotation axis of the first anti-clogging component, and the area of ​​the enclosed region formed by the longitudinal section of the drainage section gradually decreases towards the reaction chamber.

[0015] In some disclosures, the first anti-blocking component further includes a support shaft, and the linkage component includes a first helical gear and a second helical gear. The central axis of the first helical gear is vertically arranged and coincides with the central axis of the support shaft. A plurality of second helical gears are provided at the upper end of the first helical gear, and the second helical gears mesh with the first helical gear.

[0016] In some disclosures, the support shaft is a rotating rod, and the first helical gear is coaxial with and fixedly connected to the lower end of the rotating rod.

[0017] In some publicly available images, the upper end of the first anti-clogging component is equipped with blades.

[0018] In some disclosures, the support shaft is a sliding rod, and a support rod is fixed between multiple second helical gears. The central axis of the support rod does not coincide with the central axis of the helical gear. A through hole is provided through the central axis of the first helical gear. The lower end of the sliding rod is disposed with the through hole and slidably connected to the first helical gear. A sliding groove is provided in the middle of the support rod, and the sliding rod passes through the sliding groove.

[0019] In some disclosures, the second anti-clogging component includes a plurality of rotating rollers that rotate in opposite directions, and a plurality of blades are fixed to the outer side of the rotating rollers.

[0020] In some disclosures, multiple opposing rotating rollers are designated as a first rotating roller, a second rotating roller, and a third rotating roller. One end of the first rotating roller is coaxially and fixedly connected to a second helical gear, and the second and third rotating rollers are located on opposite sides of the first rotating roller. The first rotating roller and the second rotating roller are connected by a spur gear, and the second rotating roller and the third rotating roller are connected by a transmission belt.

[0021] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows:

[0022] A fixed connection refers to a connection in which parts or components are fixed in place and there is no relative movement between them;

[0023] A rotating connection is a connection between parts that allows the parts to rotate relative to each other.

[0024] Threaded connections are a type of detachable fixed connection with advantages such as simple structure, reliable connection, and convenient assembly and disassembly. They are widely used in mechanical engineering and connection structure fields.

[0025] A sliding connection is a connection between parts that allows the parts to slide against each other.

[0026] The beneficial effects of this disclosure are:

[0027] 1. The first and second anti-blocking components are connected by a linkage to form a whole, so that the first and second anti-blocking components are driven simultaneously, realizing active tearing and initial dispersion of materials, dividing the concentrated material flow into multiple streams, which helps to reduce the occurrence of "material arching". After the material enters the second anti-blocking component, the pre-treated material is deeply crushed and finely guided, which helps to further improve the anti-blocking capability.

[0028] 2. The rotation of the second anti-clogging component applies an effective shear force to the PVC slurry, a non-Newtonian fluid. This precisely utilizes the material's "shear thinning" characteristic, significantly reducing the material's apparent viscosity from a physical perspective. It transforms passive unblocking into actively improving the material's flowability, thereby accelerating the overall flow speed of the material in the discharge pipe. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this disclosure;

[0031] Figure 2 This is a schematic diagram of the installation structure of the discharge pipe and the first anti-blocking component according to an embodiment of the present disclosure;

[0032] Figure 3 This is an embodiment of the present disclosure. Figure 2 Another perspective on the overall structure;

[0033] Figure 4 This is a schematic diagram of the overall structure of the first anti-blocking component and the second anti-blocking component according to an embodiment of this disclosure;

[0034] Figure 5 This is a schematic diagram of the connection structure between the linkage component and the second anti-blocking component according to an embodiment of this disclosure;

[0035] Figure 6 This is a schematic diagram of the overall structure of the first anti-blocking component and the second anti-blocking component in the first embodiment of this disclosure;

[0036] Figure 7 This is a schematic diagram of the overall structure of the first and second anti-clogging components in the second embodiment of this disclosure.

[0037] In the diagram: 1. First anti-clogging component; 2. Support shaft; 3. Rotating rod; 4. Sliding rod; 5. Sliding groove; 6. Support rod; 7. Third rotating roller; 8. Blade; 9. Linkage component; 10. First helical gear; 11. Second helical gear; 12. Through hole; 13. Drainage part; 14. Blade; 15. Support rod; 16. Spur gear; 17. Transmission belt; 18. Reaction chamber; 19. Discharge pipe. Detailed Implementation

[0038] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0039] Please refer to Figures 1 to 6A polymerization reactor for producing PVC by suspension polymerization includes: a reaction chamber 8, a first anti-blocking component 1, and a second anti-blocking component 2;

[0040] A first anti-blocking component 1 is provided at the discharge pipe 81 of the reaction chamber 8, and a linkage component 3 is connected between the first anti-blocking component 1 and the second anti-blocking component 2;

[0041] The first anti-blocking component 1 is configured to drive the second anti-blocking component 2 to rotate synchronously via the linkage component 3 when rotating;

[0042] The first anti-blocking component 1 is used to initially tear and disperse large pieces of material from the reaction chamber 8, and guide the dispersed material to the second anti-blocking component 2;

[0043] The second anti-blocking component 2 is used to further crush and guide the received material, and applies shear force to the material through its rotation to reduce the apparent viscosity of the material, thereby accelerating the overall flow of the material in the discharge pipe 81.

[0044] When in use, the material flowing out of the discharge pipe 81 first contacts the first anti-blocking component 1. The first anti-blocking component 1 disperses the material to the periphery and sends the material into the second anti-blocking component 2. During the rotation of the second anti-blocking component 2, the meshing force when the second anti-blocking component 2 is driven is used to break and pull the large pieces of material entering the discharge pipe 81, so that the material can leave the discharge pipe 81.

[0045] The first anti-blocking component 1 and the second anti-blocking component 2 work together to divide the material entering the discharge pipe 81 into multiple parts and guide them to the second anti-blocking component 2 respectively. When the material is viscous, its rotation itself applies shear force to the material. By utilizing the shear thinning characteristics of non-Newtonian fluids such as PVC slurry, the apparent viscosity of the material is effectively reduced, thereby significantly accelerating the overall flow rate of the material in the discharge pipe 81.

[0046] The second anti-blocking component 2 is in a horizontal state. While receiving the material flowing from the first anti-blocking component 1, it also accelerates the passage of material at the upper end of the second anti-blocking component 2 through the second anti-blocking component 2.

[0047] Please refer to Figure 3 , Figure 4 and Figure 6 The first anti-blocking component 1 includes a drainage section 4, which has a longitudinal section perpendicular to the rotation axis of the first anti-blocking component 1. The area of ​​the enclosed region formed by the longitudinal section of the drainage section 4 gradually decreases towards the reaction chamber 8.

[0048] Please refer to Figure 6The flow guide 4 can be understood as a funnel shape, and its formation can include, but is not limited to, a frustum shape, a triangular pyramid shape, or a square pyramid shape. By adopting this technical solution, on the one hand, the second protective cover adopts this structure with an inclined surface and a conical tip, so that when the material flows to the flow guide 4, it can fall down along the inclined surface.

[0049] Please refer to Figures 4 to 7 The first anti-blocking component 1 also includes a support shaft, and the linkage component 3 includes a first helical gear 31 and a second helical gear 32. The central axis of the first helical gear 31 is vertically arranged, and the first helical gear 31 coincides with the central axis of the support shaft. Multiple second helical gears 32 are arranged at the upper end of the first helical gear 31, and the second helical gears 32 mesh with the first helical gear 31.

[0050] In use, when the first helical gear 31 rotates, it drives the second helical gear 32 to rotate through the meshing of the first helical gear 31 and the second helical gear 32. The first helical gear 31 and the second helical gear 32 are respectively connected to the first anti-blocking component 1 and the second anti-blocking component 2. When the first helical gear 31 rotates, it drives the first anti-blocking component 1 to operate, and when the second helical gear 32 rotates, it drives the second anti-blocking component 2 to operate. By utilizing the synchronous characteristics of this mechanical connection, the synergistic effect of the two-stage anti-blocking action in time is ensured, realizing the connection between the "crushing" and "guiding" functions, which helps to reduce the accumulation of materials that may be caused by transmission slippage or response delay.

[0051] A sealing shell is provided on the outside of the linkage 3, and the contact part between the sealing shell and the linkage 3 is watertight to prevent materials from entering the linkage 3 and hindering the rotation of the linkage 3.

[0052] First Embodiment

[0053] Please refer to Figure 4 and Figure 6 The support shaft is a rotating rod 11, and the first helical gear 31 is coaxial with and fixedly connected to the lower end of the rotating rod 11;

[0054] In use, when the first helical gear 31 rotates, it drives the rotating rod 11 and the guide section 4 to rotate coaxially. When the guide section 4 rotates, since it is vertically oriented, the centrifugal force generated by its rotation throws the material attached to its outer side toward the inner wall of the discharge pipe 81. The conical guide surface then guides this thrown material downwards. This synergistic effect of "centrifugal throwing" and "inclined guide" breaks up the stagnant layer of material on the wall, thereby accelerating the material outflow speed.

[0055] Furthermore, during the rotation of the flow guide 4, it acts like an "axial flow impeller," causing the first anti-blocking component 1 to actively stir and guide the material instead of passively waiting for it to fall, forming a strong and stable spiral downward flow field around it. This flow field generates a "pumping effect" on the material, namely a downward axial force, thereby accelerating the speed at which the material leaves the reaction chamber 8 and enters the discharge pipe 81.

[0056] Please refer to Figure 4 and Figure 6 The upper end of the first anti-blocking component 1 is provided with a blade 41, which further increases the vortex generated when the drainage part 4 rotates.

[0057] Second Embodiment

[0058] Please refer to Figure 7 The support shaft is a sliding rod 12. A support rod 5 is fixed between multiple second helical gears 32. The central axis of the support rod 5 does not coincide with the central axis of the helical gear. A through hole 311 is provided through the central axis of the first helical gear 31. The lower end of the sliding rod 12 is provided with the through hole 311 and is slidably connected to the first helical gear 31. A sliding groove 121 is provided in the middle of the support rod 5. The sliding rod 12 is provided through the sliding groove 121.

[0059] When the second helical gear 32 rotates, it drives the support rod 5 to rotate around the central axis of the second helical gear 32. When the second support rod 5 rotates, it slides along the sliding groove 121. When the support rod 5 rotates to the top, the friction between the second support rod 5 and the inner wall of the sliding groove 121, as well as the axial restraining force of the inner wall of the through hole 311 on the support rod 5, causes the second support rod 5 to slide up and down along the inner wall of the through hole 311, thereby forming a piston-like structure, which accelerates the longitudinal flow speed of the material.

[0060] Furthermore, the sealing shell and the inner wall of the first anti-blocking component 1 are sealed by an elastic rubber strip, so that the area covered by the sealing shell is sealed during the up-and-down movement of the first anti-blocking component 1, thereby preventing material from seeping into the vicinity of the linkage component 3.

[0061] Please refer to Figures 4 to 5 The second anti-blocking component 2 includes multiple rotating rollers that rotate in opposite directions, and multiple blades 24 are fixed on the outer side of the rotating rollers;

[0062] In use, multiple rotating rollers rotate in opposite directions, and the blades 24 on adjacent rotating rollers interweave with each other. When the material passes between two adjacent rotating rollers, the material is cut and pulled by the interweaving blades 24 on the adjacent rotating rollers, causing the material to break down. In addition, the blades 24 shear the material during the cutting process, thereby thinning the material and accelerating the flow rate of the material.

[0063] Please refer to Figures 4 to 7The multiple rotating rollers that rotate in opposite directions are a first rotating roller 21, a second rotating roller 22 and a third rotating roller 23. One end of the first rotating roller 21 is coaxially fixedly connected to the second helical gear 32, and the second rotating roller 22 and the third rotating roller 23 are located on both sides of the first rotating roller 21. The first rotating roller 21 and the second rotating roller 22 are connected by a spur gear 6, and the second rotating roller 22 and the third rotating roller 23 are connected by a transmission belt 7.

[0064] When the second helical gear 32 rotates, it drives the first rotating roller 21 connected to the second helical gear 32 to rotate. When the first rotating roller 21 rotates, it drives an adjacent second rotating roller 22 to rotate in the opposite direction through the meshing of the spur gear 6. At the same time, when the second rotating roller 22 rotates, it drives the third rotating roller 23 to rotate in the same direction as the second rotating roller 22 through the transmission belt 7. This causes the second rotating roller 22 and the third rotating roller 23 to rotate in the opposite direction to the first rotating roller 21, so that the multiple blades 24 interweave with each other, and the material flowing into the space between the multiple rotating rollers rotating in opposite directions is pulled and crushed by the blades 24.

[0065] The first rotating roller 21, together with the second rotating roller 22 and the third rotating roller 23, generates tangential upward and downward forces on the material in the two gaps when the material enters the gap between the three rotating rollers, further increasing the vertical flow of the material.

[0066] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] The foregoing has shown and described the basic principles, main features, and advantages of this disclosure. Those skilled in the art should understand that this disclosure is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this disclosure. Various changes and modifications can be made to this disclosure without departing from its spirit and scope, and all such changes and modifications fall within the scope of this disclosure as claimed.

Claims

1. A polymerization reactor for producing PVC by suspension polymerization, characterized in that, include: Reaction chamber (8), first anti-blocking component (1), and second anti-blocking component (2); The discharge pipe (81) of the reaction chamber (8) is provided with a first anti-blocking component (1), and a linkage component (3) is connected between the first anti-blocking component (1) and the second anti-blocking component (2); Wherein, the first anti-blocking component (1) is configured to drive the second anti-blocking component (2) to rotate synchronously through the linkage component (3) when rotating; The first anti-blocking component (1) is used to initially tear and disperse the large pieces of material from the reaction chamber (8), and guide the dispersed material to the second anti-blocking component (2); The second anti-blocking component (2) is used to further crush and guide the received material, and to apply shear force to the material by rotating it, thereby reducing the apparent viscosity of the material and accelerating the overall flow speed of the material in the discharge pipe (81).

2. The polymerization reactor for PVC production by suspension polymerization according to claim 1, characterized in that, The first anti-blocking component (1) includes a drainage section (4), which has a longitudinal section perpendicular to the rotation axis of the first anti-blocking component (1), and the area of ​​the enclosed region formed by the longitudinal section of the drainage section (4) gradually decreases toward the reaction chamber (8).

3. The polymerization reactor for PVC production by suspension polymerization according to claim 2, characterized in that, The first anti-blocking component (1) also includes a support shaft, and the linkage component (3) includes a first helical gear (31) and a second helical gear (32). The central axis of the first helical gear (31) is vertically arranged, and the central axis of the first helical gear (31) coincides with the central axis of the support shaft. Multiple second helical gears (32) are arranged at the upper end of the first helical gear (31), and the second helical gears (32) mesh with the first helical gear (31).

4. The polymerization reactor for PVC production by suspension polymerization according to claim 3, characterized in that, The support shaft is a rotating rod (11), and the first helical gear (31) is coaxial with and fixedly connected to the lower end of the rotating rod (11).

5. The polymerization reactor for PVC production by suspension polymerization according to claim 4, characterized in that, The upper end of the first anti-clogging component (1) is provided with a blade (41).

6. The polymerization reactor for PVC production by suspension polymerization according to claim 3, characterized in that, The support shaft is a sliding rod (12), and a support rod (5) is fixed between multiple second helical gears (32). The central axis of the support rod (5) does not coincide with the central axis of the helical gear. A through hole (311) is provided through the central axis of the first helical gear (31). The lower end of the sliding rod (12) is provided with the through hole (311) and is slidably connected to the first helical gear (31). A sliding groove (121) is provided in the middle of the support rod (5), and the sliding rod (12) is provided through the sliding groove (121).

7. The polymerization reactor for PVC production by suspension polymerization according to claim 5, characterized in that, The second anti-blocking component (2) includes multiple rotating rollers that rotate in opposite directions, and multiple blades (24) are fixed on the outer side of the rotating rollers.

8. The polymerization reactor for PVC production by suspension polymerization according to claim 7, characterized in that, Multiple rotating rollers rotating in opposite directions are a first rotating roller (21), a second rotating roller (22), and a third rotating roller (23). One end of the first rotating roller (21) is coaxially fixedly connected to a second helical gear (32), and the second rotating roller (22) and the third rotating roller (23) are located on both sides of the first rotating roller (21). The first rotating roller (21) and the second rotating roller (22) are connected by a spur gear (6), and the second rotating roller (22) and the third rotating roller (23) are connected by a transmission belt (7).

Images