A small, anti-clogging initiator addition device for vinyl chloride polymerization reactor

Abstract

This utility model relates to the field of production technology in the chemical polyvinyl chloride (PVC) industry, and in particular to a small-scale anti-clogging initiator addition device for PVC polymerization reactors. It includes a polymerization reactor body, an initiator storage tank, an upper inlet pipe, a lower inlet pipe, a double-ended pipe, an installation cylinder, an electric heating belt, a spiral guide vane, a fixing ring, connecting springs, an annular scraper, and control components. The initiator storage tank is located on the right side of the polymerization reactor body. The upper inlet pipe runs through the bottom of the initiator storage tank, and the lower inlet pipe runs through the left end of the upper inlet pipe. A spiral guide vane is fixedly installed on the inner wall of the lower inlet pipe. Multiple sets of connecting springs are fixedly installed on the bottom wall of the fixing ring, and an annular scraper is fixedly installed at the lower end of the connecting springs. This small-scale anti-clogging initiator addition device for PVC polymerization reactors provides a reliable anti-clogging solution for continuous chemical production through the organic combination of fluid dynamics optimization and temperature control during use.

Description

Technical Field

[0001] This utility model relates to the field of production technology in the chemical polyvinyl chloride industry, and in particular to a small-scale initiator addition device for polyvinyl chloride polymerization reactor that prevents clogging. Background Technology

[0002] In the chemical industry, polyvinyl chloride (PVC) is a widely used synthetic resin. With its excellent mechanical properties, outstanding chemical corrosion resistance, good electrical insulation, and excellent processing performance, it occupies an important position in many industries. PVC resin is generated through a polymerization reaction, and the initiator, as an indispensable key auxiliary agent in this polymerization reaction, has a decisive influence on the core properties such as the polymerization rate and molecular weight of PVC resin, and thus directly affects the quality and application performance of PVC products.

[0003] When the initiator addition device for vinyl chloride polymerization reactor is in use, the precise addition of the initiator is the core link to ensure the stable operation of the polymerization reaction. Traditional initiator addition devices usually adopt a single straight pipe conveying structure. After the material is metered by an automatic control valve, it is directly injected into the polymerization reactor along a vertical or horizontal pipe. Although this design can meet the basic requirements for low viscosity and non-crystalline materials, it has significant defects in the addition of high viscosity and easily crystallizing initiators, such as diethylhexyl peroxide dicarbonate. The fluid in the straight pipe section is in a laminar flow state, and the boundary layer thickens, leading to the accumulation of deposits on the pipe wall. Under low temperature conditions, the risk of material crystallization is further aggravated, eventually causing pipe blockage. Especially in continuous production processes, blockage will directly lead to interruption of the polymerization reactor feed and an increased risk of thermal runaway of the reaction, requiring frequent shutdowns to clear the blockage, which seriously restricts production efficiency and equipment utilization.

[0004] Therefore, to address the aforementioned problem of inconvenience in preventing self-polymerization blockage in the initiator addition pipe, a small-scale anti-blockage initiator addition device for vinyl chloride polymerization reactors can be designed. When the initiator addition device is in use, the material in the initiator storage tank is precisely metered by an automatic control valve and then sequentially passes through a segmented inclined pipeline system consisting of an upper and lower initiation pipe. During the transportation process, the valves open in concert to form a bidirectional flow path. The initiator flows downward along the inclined angle of the lower initiation pipe, using gravity to reduce adhesion to the pipe wall. The spiral guide vanes installed on the inner wall of the pipe transform the straight flow into a spiral flow field. Combined with the elastic oscillation system formed by the annular scraper under the action of the connecting spring, periodic pulsating impacts are generated when the fluid passes through, which can both scrape off potential crystals on the pipe wall and destroy the fluid boundary layer to prevent deposition. When a low temperature risk is detected, the electric heating belt is activated to form a closed-loop temperature control system to ensure that the initiator maintains the optimal flow state. Finally, the initiator is injected into the tank through the dual-pass pipe. This technical solution provides a reliable anti-blockage solution for continuous chemical production through the organic combination of fluid dynamics optimization and temperature control, and is particularly suitable for the precise addition of high-viscosity and easily crystallizing materials. Utility Model Content

[0005] To overcome the problem that traditional initiator addition devices for vinyl chloride polymerization reactors typically use a single straight pipe conveying structure, in scenarios involving the addition of high-viscosity, easily crystallizing initiators, the fluid in the straight pipe section is in a laminar flow state, the boundary layer thickens, leading to the accumulation of deposits on the pipe wall, and the risk of material crystallization is further aggravated in low-temperature environments, ultimately causing self-polymerization blockage in the initiator addition pipe.

[0006] The technical solution of this utility model is as follows: a small anti-clogging initiator addition device for a vinyl chloride polymerization reactor, comprising a polymerization reactor body, an initiator storage tank, an upper inlet pipe, a lower inlet pipe, a double-pass pipe, an installation cylinder, an electric heating belt, a spiral guide vane, a fixing ring, a connecting spring, an annular scraper, and a control component. The initiator storage tank is located on the right side of the polymerization reactor body. The upper inlet pipe is connected through the bottom of the initiator storage tank, and the lower inlet pipe is connected through the left end of the upper inlet pipe. The double-pass pipe is connected through the bottom of the polymerization reactor body. An installation cylinder is installed on the side wall of the lower inlet pipe, and an electric heating belt is installed inside the installation cylinder. A spiral guide vane is fixedly installed on the inner wall of the lower inlet pipe, and a fixing ring is fixedly installed at the lower end of the spiral guide vane. Multiple sets of connecting springs are fixedly installed on the bottom wall of the fixing ring, and an annular scraper is fixedly installed at the lower end of the connecting spring. A control component is installed on the side wall of the upper inlet pipe.

[0007] Preferably, when the initiator addition device for the vinyl chloride polymerization reactor is in use, the material in the initiator storage tank is precisely metered by an automatic control valve and then sequentially passes through a segmented inclined pipeline system consisting of an upper and lower inlet pipe. During the transport process, the valves open in tandem to form a bidirectional flow path. The initiator flows downward along the inclined angle of the lower inlet pipe, utilizing gravity to reduce adhesion to the pipe wall. The spiral guide vanes installed on the inner wall of the pipe transform the straight flow into a spiral flow field. Combined with the elastic oscillating system formed by the annular scraper under the action of the connecting spring, periodic pulsating impacts are generated when the fluid passes through, which can both scrape off potential crystals on the pipe wall and disrupt the fluid boundary layer to prevent deposition. When a low temperature risk is detected, The electric heating element activates to form a closed-loop temperature control system, ensuring the initiator maintains optimal flow. Finally, the initiator is injected into the tank through a dual-pipe system. In summary, this device, through segmented inclined pipes and a spiral flow guiding structure, generates a spiral propulsion force in the fluid, eliminating the fluid stagnation zone of traditional straight pipe sections. Simultaneously, the elastically connected annular scraper system utilizes fluid kinetic energy for self-driven cleaning, improving cleaning efficiency without additional energy consumption. Furthermore, electric heating effectively suppresses low-temperature crystallization. This technical solution, through the organic combination of fluid dynamics optimization and temperature control, provides a reliable anti-clogging solution for continuous chemical production, particularly suitable for the precise addition of high-viscosity, easily crystallizing materials.

[0008] Preferably, the lower right end of the double-pass pipe is connected to the left end of the lower inlet pipe, and the electric heating tape is wrapped around the side wall of the lower inlet pipe.

[0009] Preferably, the control components include an initiator centrifugal pump, a control check valve, and an on / off check valve. The initiator centrifugal pump is installed in the middle section of the upper inlet pipe, the control check valve is installed on the side wall of the upper inlet pipe, and the on / off check valve is installed on the side wall of the double-pass pipe.

[0010] Preferably, the monitoring component includes a temperature sensor, with the temperature sensor located on the bottom wall of the left end of the lower inlet pipe, and the bottom of the temperature sensor being fixedly connected to the bottom wall of the lower inlet pipe.

[0011] Preferably, a stirring motor is fixedly installed on the top of the polymerization reactor, a stirring shaft is installed at the output end of the stirring motor, and a stirring support is fixedly installed on the side wall of the stirring shaft.

[0012] Preferably, the stirring support is located inside the polymerization reactor tank, and a shaft seat is fixedly installed on the inner bottom wall of the polymerization reactor tank. The lower end of the stirring shaft is rotatably connected to the inner wall of the shaft seat.

[0013] Preferably, a feed pipe is provided through the top of the polymerization reactor, and a discharge pipe is provided through the bottom of the polymerization reactor.

[0014] The beneficial effects of this utility model are:

[0015] When the initiator addition device for vinyl chloride polymerization reactor is in use, the material in the initiator storage tank is precisely metered by an automatic control valve and then sequentially passes through a segmented inclined pipeline system consisting of an upper and lower inlet pipe. During the transport process, the valves open in tandem to form a bidirectional flow path. The initiator flows downward along the inclined angle of the lower inlet pipe, utilizing gravity to reduce adhesion to the pipe wall. The spiral guide vanes installed on the inner wall of the pipe transform the straight flow into a spiral flow field. Combined with the elastic oscillating system formed by the annular scraper under the action of the connecting spring, periodic pulsating impacts are generated when the fluid passes through, which can both scrape off potential crystals on the pipe wall and disrupt the fluid boundary layer to prevent deposition. When a low-temperature risk is detected, the electric... The heating element activates to form a closed-loop temperature control system, ensuring the initiator maintains optimal flow. The initiator is then injected into the tank through a dual-pipe system. In summary, this device, through segmented inclined pipes and a spiral flow guiding structure, generates a spiral propulsion force in the fluid, eliminating the fluid stagnation zone found in traditional straight pipe sections. Simultaneously, the elastically connected annular scraper system utilizes fluid kinetic energy for self-driven cleaning, improving cleaning efficiency without additional energy consumption. Furthermore, electric heating effectively suppresses low-temperature crystallization. This technical solution, through the organic combination of fluid dynamics optimization and temperature control, provides a reliable anti-clogging solution for continuous chemical production, particularly suitable for the precise addition of high-viscosity, easily crystallizing materials. Attached Figure Description

[0016] Figure 1 The diagram shown is a first three-dimensional structural schematic of a small anti-clogging vinyl chloride polymerization reactor initiator addition device according to this utility model.

[0017] Figure 2 The diagram shown is a half-section three-dimensional structural diagram of the polymerization reactor tank of a small anti-clogging vinyl chloride polymerization reactor initiator addition device according to this utility model.

[0018] Figure 3 What is shown is Figure 2 Schematic diagram of the three-dimensional structure at the circled mark;

[0019] Figure 4 What is shown is Figure 3 Schematic diagram of the three-dimensional structure at the circled mark;

[0020] Explanation of reference numerals in the attached drawings: 1. Polymerization reactor body; 2. Initiator storage tank; 3. Upper inlet pipe; 4. Lower inlet pipe; 5. Double-pass pipe; 6. Mounting cylinder; 7. Electric heating belt; 8. Spiral guide vane; 9. Fixing ring; 10. Connecting spring; 11. Annular scraper; 12. Initiator centrifugal pump; 13. Control check valve; 14. Opening and closing check valve; 15. Temperature sensor; 16. Stirring motor; 17. Stirring shaft; 18. Stirring support; 19. Shaft seat; 20. Feed pipe; 21. Discharge pipe. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please see Figure 1 and Figure 4 This utility model provides an embodiment: a small anti-clogging initiator addition device for a vinyl chloride polymerization reactor, comprising a polymerization reactor tank 1, an initiator storage tank 2, an upper inlet pipe 3, a lower inlet pipe 4, a double-pass pipe 5, an installation cylinder 6, an electric heating belt 7, a spiral guide vane 8, a fixing ring 9, a connecting spring 10, an annular scraper 11, and a control assembly. The initiator storage tank 2 is located on the right side of the polymerization reactor tank 1, and the upper inlet pipe 3 is provided through the bottom of the initiator storage tank 2. The left end of the upper inlet pipe 3... A lower inlet pipe 4 is provided through the bottom of the polymerization reactor tank 1. A double-through pipe 5 is provided through the bottom of the lower inlet pipe 4. An installation cylinder 6 is provided on the side wall of the lower inlet pipe 4. An electric heating belt 7 is provided inside the installation cylinder 6. A spiral guide vane 8 is fixedly provided on the inner wall of the lower inlet pipe 4. A fixing ring 9 is fixedly provided at the lower end of the spiral guide vane 8. Multiple sets of connecting springs 10 are fixedly provided on the bottom wall of the fixing ring 9. An annular scraper 11 is fixedly provided at the lower end of the connecting spring 10. A control component is provided on the side wall of the upper inlet pipe 3.

[0023] Please see Figure 2 and Figure 3 The lower right end of the double-pass pipe 5 is connected to the left end of the lower inlet pipe 4. The electric heating belt 7 is wound around the side wall of the lower inlet pipe 4. When a low temperature risk is detected, the electric heating belt 7 is activated to form a closed-loop temperature control system to ensure that the initiator maintains the best flow state. The control components include an initiator centrifugal pump 12, a control check valve 13, and an open / close check valve 14. The initiator centrifugal pump 12 is installed in the middle section of the upper inlet pipe 3. The control check valve 13 is installed on the side wall of the upper inlet pipe 3. The open / close check valve 14 is installed on the side wall of the double-pass pipe 5. During the delivery process, the control check valve 13 and the open / close check valve 14 work together to open to form a bidirectional flow path. The monitoring components include a temperature sensor 15. The temperature sensor 15 is installed on the bottom wall of the left end of the lower inlet pipe 4. The bottom of the temperature sensor 15 is fixedly connected to the bottom wall of the lower inlet pipe 4. The temperature sensor 15 monitors the pipe wall temperature in real time.

[0024] Please see Figure 1 and Figure 2 A stirring motor 16 is fixedly installed on the top of the polymerization reactor tank 1. A stirring shaft 17 is installed at the output end of the stirring motor 16. A stirring support 18 is fixedly installed on the side wall of the stirring shaft 17. When the stirring motor 16 is started, it drives the stirring shaft 17 to drive the stirring support 18 to rotate at high speed inside the polymerization reactor, forming a three-dimensional turbulent mixing field. The stirring support 18 is located inside the polymerization reactor tank 1. A bearing seat 19 is fixedly installed on the inner bottom wall of the polymerization reactor tank 1. The lower end of the stirring shaft 17 is rotatably connected to the inner wall of the bearing seat 19. When the stirring motor 16 is started, it drives the stirring shaft 17 to drive the stirring support 18 to rotate at high speed inside the polymerization reactor, forming a three-dimensional turbulent mixing field. A feed pipe 20 is installed through the top of the polymerization reactor tank 1, and a discharge pipe 21 is installed through the bottom of the polymerization reactor tank 1. The material enters the tank through the feed pipe 20 and is finally discharged through the discharge pipe 21.

[0025] When the initiator addition device for the vinyl chloride polymerization reactor is in use, the stirring motor 16 drives the stirring shaft 17 to drive the stirring support 18 to rotate at high speed in the polymerization reactor, forming a three-dimensional turbulent mixing field. At this time, the material in the initiator storage tank 2 is accurately metered by the self-control valve and then transported by the initiator centrifugal pump 12. It passes through the segmented inclined pipeline system composed of the upper inlet pipe 3 and the lower inlet pipe 4 in sequence.

[0026] During the transport process, the control check valve 13 and the opening and closing check valve 14 work together to form a bidirectional flow path. The initiator flows downward along the inclined angle of the lower section of the inlet pipe 4, using gravity to reduce adhesion to the pipe wall. The spiral guide vane 8 installed on the inner wall of the pipe transforms the straight flow into a spiral flow field. Combined with the elastic oscillation system formed by the annular scraper 11 under the action of the connecting spring 10, periodic pulsating impacts are generated when the fluid passes through. This can scrape off potential crystals on the pipe wall and destroy the fluid boundary layer to prevent deposition. The temperature sensor 15 monitors the pipe wall temperature in real time. When a low temperature risk is detected, the electric heating belt 7 is activated to form a closed-loop temperature control system to ensure that the initiator maintains the optimal flow state. Finally, the initiator is injected into the tank through the double-pass pipe 5.

[0027] In summary, this device, through segmented inclined pipes and a spiral flow guiding structure, generates a spiral propulsion force for the fluid, eliminating the fluid stagnation zone found in traditional straight pipe sections. Simultaneously, the elastically connected annular scraper system 11 utilizes fluid kinetic energy for self-driven cleaning, improving cleaning efficiency without additional energy consumption. Furthermore, electric heating effectively suppresses low-temperature crystallization. This technical solution, through the organic combination of fluid dynamics optimization and temperature control, provides a reliable anti-clogging solution for continuous chemical production, and is particularly suitable for the precise addition of high-viscosity, easily crystallizing materials.

[0028] Through the above steps, when the initiator addition device for vinyl chloride polymerization reactor is in use, the material in the initiator storage tank 2 is precisely metered by the automatic control valve and then sequentially passes through the segmented inclined pipeline system composed of the upper inlet pipe 3 and the lower inlet pipe 4. During the transportation process, the valves open in concert to form a bidirectional flow path. The initiator flows downward along the inclined angle of the lower inlet pipe 4, using gravity to reduce adhesion to the pipe wall. The spiral guide vanes 8 installed on the inner wall of the pipe convert the straight flow into a spiral flow field. Combined with the elastic oscillation system formed by the annular scraper 11 under the action of the connecting spring 10, periodic pulsating impacts are generated when the fluid passes through, which can both scrape off potential crystals on the pipe wall and destroy the fluid boundary layer to prevent deposition. When a low In case of temperature risk, the electric heating belt 7 is activated to form a closed-loop temperature control system, ensuring that the initiator maintains optimal flow. Finally, the initiator is injected into the tank through the dual-pipe 5. In summary, this device, through segmented inclined pipes and a spiral flow guiding structure, generates a spiral propulsion force for the fluid, eliminating the fluid stagnation zone of traditional straight pipe sections. At the same time, the elastically connected annular scraper 11 system utilizes fluid kinetic energy to achieve self-driven cleaning, which can improve cleaning efficiency without additional energy consumption. Furthermore, electric heating can effectively suppress low-temperature crystallization. This technical solution, through the organic combination of fluid dynamics optimization and temperature control, provides a reliable anti-clogging solution for continuous chemical production, and is particularly suitable for the precise addition of high-viscosity, easily crystallizing materials.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A small-scale, anti-clogging initiator addition device for vinyl chloride polymerization reactor, comprising a polymerization reactor tank (1), characterized in that: It also includes an initiator storage tank (2), an upper inlet pipe (3), a lower inlet pipe (4), a double-pass pipe (5), an installation cylinder (6), an electric heating belt (7), a spiral guide vane (8), a fixing ring (9), a connecting spring (10), an annular scraper (11), and control components. The initiator storage tank (2) is located on the right side of the polymerization reactor tank (1). The upper inlet pipe (3) is installed through the bottom of the initiator storage tank (2), and the lower inlet pipe (4) is installed through the left end of the upper inlet pipe (3). A double-through pipe (5) is provided at the bottom. An installation cylinder (6) is provided on the side wall of the lower section inlet pipe (4). An electric heating belt (7) is provided inside the installation cylinder (6). A spiral guide vane (8) is fixedly provided on the inner wall of the lower section inlet pipe (4). A fixing ring (9) is fixedly provided at the lower end of the spiral guide vane (8). Multiple sets of connecting springs (10) are fixedly provided on the bottom wall of the fixing ring (9). An annular scraper (11) is fixedly provided at the lower end of the connecting spring (10). A control component is provided on the side wall of the upper section inlet pipe (3).

2. The anti-clogging small-scale vinyl chloride polymerization reactor initiator addition device according to claim 1, characterized in that: The lower right end of the double-through pipe (5) is connected to the left end of the lower inlet pipe (4), and the electric heating belt (7) is wrapped around the side wall of the lower inlet pipe (4).

3. The anti-clogging small-scale vinyl chloride polymerization reactor initiator addition device according to claim 1, characterized in that: The control components include an initiator centrifugal pump (12), a control check valve (13), and an on / off check valve (14). The initiator centrifugal pump (12) is installed in the middle section of the upper inlet pipe (3), the control check valve (13) is installed on the side wall of the upper inlet pipe (3), and the on / off check valve (14) is installed on the side wall of the double-pass pipe (5).

4. The anti-clogging small-scale vinyl chloride polymerization reactor initiator addition device according to claim 1, characterized in that: The monitoring component includes a temperature sensor (15). The temperature sensor (15) is installed on the bottom wall of the left end of the lower inlet pipe (4). The bottom of the temperature sensor (15) is fixedly connected to the bottom wall of the lower inlet pipe (4).

5. The anti-clogging small-scale vinyl chloride polymerization reactor initiator addition device according to claim 1, characterized in that: A stirring motor (16) is fixedly installed on the top of the polymerization tank (1), and a stirring shaft (17) is installed at the output end of the stirring motor (16). A stirring bracket (18) is fixedly installed on the side wall of the stirring shaft (17).

6. The anti-clogging small-scale vinyl chloride polymerization reactor initiator addition device according to claim 5, characterized in that: The stirring support (18) is set inside the polymerization reactor tank (1). A bearing seat (19) is fixedly set on the inner bottom wall of the polymerization reactor tank (1). The lower end of the stirring shaft (17) is rotatably connected to the inner wall of the bearing seat (19).

7. The anti-clogging small-scale vinyl chloride polymerization reactor initiator addition device according to claim 1, characterized in that: A feed pipe (20) is provided through the top of the polymerization reactor (1), and a discharge pipe (21) is provided through the bottom of the polymerization reactor (1).

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