Anti-clogging polymerizer initiator feeding device

Abstract

The present application relates to chemical equipment technical field, specifically prevent the polymeric kettle initiator adding device of blocking, including kettle body, conveying pipeline, conveying pump and electromagnetic valve, the anti-blocking assembly is arranged between the electromagnetic valve and the kettle body, the anti-blocking assembly includes the conveying cylinder arranged between the electromagnetic valve and the kettle body, one end of the conveying cylinder is equipped with flange plate, the servo motor is installed at the end of the conveying cylinder, the transmission rod is connected to the servo motor output end, the transmission rod wall is connected with helical blade, the conveying pipe is embedded in one side of the bottom end of the conveying cylinder, the energy gathering ring is arranged in the inner end of the conveying cylinder close to the flange plate side, a plurality of energy gathering grooves are formed in the inner ring of the energy gathering ring, the annular shunt pipe is sleeved on one end of the outer wall of the conveying cylinder, the air inlet pipe is embedded in one side of the annular shunt pipe, a plurality of gas pipes are arranged on the side of the annular shunt pipe close to the electromagnetic valve, the present application effectively solves the technical problem that the initiator is retained and blocked, and the effective conveying of helical blade is affected due to the sudden change of flow passage cross section at the flange plate connection in the prior art.

Description

Technical Field

[0001] This invention relates to the field of chemical equipment technology, specifically to an anti-clogging polymerization reactor initiator addition device. Background Technology

[0002] In the polymerization process of polyvinyl chloride (PVC) and other similar products, initiators are key additives for starting the polymerization reaction and need to be quantitatively transported from storage tanks to the polymerization reactor via dedicated pipelines. Initiators are chemically reactive and temperature-sensitive, and during transport, they easily remain on the inner wall of the pipeline and undergo self-polymerization, generating plastics or polymer scale, leading to pipeline blockage. In severe cases, the initiator feed pipe needs to be cleaned after each reactor, affecting production continuity and process safety. In the prior art, various solutions have been proposed to address the problem of initiator pipeline blockage. The Chinese utility model patent (CN224422862U; A small anti-clogging initiator addition device for vinyl chloride polymerization reactor) authorized on June 30, 2026, adopts a combined structure of "electric heating belt + spiral guide vane + annular scraper". The electric heating belt prevents low-temperature crystallization of the initiator, the spiral guide vane optimizes fluid distribution, and the annular scraper removes deposits from the pipe wall.

[0003] Existing chemical pipelines use flange connections. When the initiator enters the conveying pipeline from the solenoid valve, the sudden change in the flow channel cross-section easily creates a flow dead zone and material stagnation in this area. There is a transition zone without flow guiding between the starting end of the spiral guide vane and the flange. The initiator stays in this area for a longer time and is more prone to self-polymerization and scaling. Blockage at this point directly affects the effective conveying of the subsequent spiral blades, causing the entire feeding system to fail. Therefore, it is necessary to propose an anti-clogging polymerization reactor initiator addition device. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides an anti-clogging polymerization reactor initiator addition device.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an anti-clogging polymerization reactor initiator addition device, including a reactor body, a conveying pipe, a conveying pump and an electromagnetic valve, wherein an anti-clogging component is provided between the electromagnetic valve and the reactor body, the anti-clogging component includes a conveying cylinder provided between the electromagnetic valve and the reactor body, one end of the conveying cylinder is provided with a flange, and the conveying cylinder is bolted to the electromagnetic valve through the flange, a servo motor is installed at the end of the conveying cylinder, the output end of the servo motor is connected to a transmission rod, the transmission rod wall is connected with a spiral blade, and a conveying pipe is embedded on one side of the bottom end of the conveying cylinder; The inner end of the conveying cylinder near the flange is provided with an energy-concentrating ring. The inner ring of the energy-concentrating ring has several energy-concentrating grooves. One end of the outer wall of the conveying cylinder is fitted with an annular diverter pipe. An air inlet pipe is embedded on one side of the annular diverter pipe. A valve is provided at the end of the air inlet pipe. Several air delivery pipes are provided on the side of the annular diverter pipe near the solenoid valve. The air delivery pipes pass through the flange and extend into the conveying cylinder. An air outlet pipe is embedded at the upper end of one side of the conveying cylinder.

[0006] Specifically, the inner end of the vessel is equipped with a stirring assembly, and the bottom of the vessel is equipped with support legs and a discharge pipe.

[0007] Specifically, temperature detectors are embedded on both sides of the top of the conveying cylinder, and a temperature control jacket is fitted around the outer periphery of the conveying cylinder.

[0008] Specifically, the inner groove of the energy-concentrating ring is cone-shaped, and the energy-concentrating groove corresponds to the output port of the gas transmission pipe.

[0009] Specifically, the axial diameter of the energy-concentrating trough is distributed in a decreasing manner, and the energy-concentrating trough is arranged at an angle.

[0010] Specifically, several of the gas supply pipes are configured as unidirectional channels.

[0011] The first beneficial effect of this invention is that by setting up a focusing ring and a conical focusing groove, the initiator is guided and accelerated when it enters the inlet end of the conveying cylinder, which changes the flow state of the initiator and reduces the retention and wall adhesion of the initiator at the inlet end of the conveying cylinder. This effectively solves the technical problem in the prior art where the initiator is stuck and self-blocked at the flange connection due to the sudden change in the flow channel cross section, which affects the effective conveying of the spiral blades. At the same time, nitrogen is sprayed out through the focusing groove through the gas supply pipe, forming a continuous and stable gas curtain protective layer on the inner wall of the conveying cylinder. This physically isolates the main fluid of the initiator from the inner wall of the conveying cylinder, destroys the adhesion conditions required for the initiator to self-polymerize on the wall, and blocks the self-polymerization reaction of the initiator at the pipe wall from the source.

[0012] The second beneficial effect of this invention is that by continuously purging and flushing the inner wall of the conveying cylinder with nitrogen gas curtain during the initiator delivery process, and in synergy with the active pushing of the spiral blades, the initiator can pass through the conveying cylinder quickly and prevent blockage throughout the process. Compared with the passive heat preservation method of the existing solution that only relies on electric heating to heat the pipe wall, this solution does not rely on heating the pipe wall, thus avoiding the defect that heating will accelerate the self-polymerization of the initiator at the wall surface. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 A schematic diagram of the overall structure of the anti-clogging polymerization reactor initiator addition device provided by the present invention; Figure 2A schematic diagram of the conveyor cylinder structure of the anti-clogging polymerization reactor initiator addition device provided by the present invention; Figure 3 A cross-sectional schematic diagram of the anti-clogging polymerization reactor initiator addition device provided by the present invention; Figure 4 The anti-clogging polymerization reactor initiator addition device provided by the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 A schematic diagram of the energy-concentrating ring structure of the anti-clogging polymerization reactor initiator addition device provided by the present invention.

[0015] In the diagram: 1. Reactor body; 2. Delivery pipe; 3. Anti-clogging component; 21. Delivery pump; 22. Solenoid valve; 30. Temperature control jacket; 31. Delivery cylinder; 32. Servo motor; 33. Delivery pipe; 34. Valve; 35. Inlet pipe; 36. Annular diverter pipe; 37. Gas pipe; 38. Energy-concentrating ring; 220. Flange; 301. Energy-concentrating tank; 310. Temperature detector; 311. Outlet pipe; 320. Transmission rod; 321. Spiral blade. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0017] Example 1: refer to Figures 1-2 The structure shown is a non-clogging polymerization reactor initiator addition device, including a reactor body 1, a conveying pipe 2, a conveying pump 21 and an electromagnetic valve 22. A non-clogging component 3 is provided between the electromagnetic valve 22 and the reactor body 1. The non-clogging component 3 includes a conveying cylinder 31 provided between the electromagnetic valve 22 and the reactor body 1. One end of the conveying cylinder 31 is provided with a flange 220, and the conveying cylinder 31 is bolted to the electromagnetic valve 22 through the flange 220. A servo motor 32 is installed at the end of the conveying cylinder 31. The output end of the servo motor 32 is connected to a transmission rod 320. The rod wall of the transmission rod 320 is connected to a spiral blade 321. A conveying pipe 33 is embedded on one side of the bottom end of the conveying cylinder 31. A stirring assembly is provided at the inner end of the vessel body 1, and a support leg and a discharge pipe are provided at the bottom of the vessel body 1. Temperature detectors 310 are embedded on both sides of the top of the conveying cylinder 31, and a temperature control jacket 30 is fitted around the outer periphery of the conveying cylinder 31.

[0018] Among them, the temperature detector 310 is used to monitor the temperature of the initial section inside the conveying cylinder 31 in real time; the temperature control jacket 30 is an annular cavity structure, which can be circulated with cooling water or heating medium to adjust the wall temperature of the conveying cylinder 31 so that the initiator is kept in a suitable temperature range during the conveying process.

[0019] The mixing assembly includes a drive motor, a mixing shaft, mixing blades, and a scraping structure. The drive motor is fixedly mounted on the top of the polymerization reactor lid, and its output end is connected to the mixing shaft. The mixing shaft is rotatably mounted at the center of the reactor body 1 via a bearing seat, extending vertically downwards to the bottom of the reactor body 1. A bottom mixing rod (or U-shaped mixing frame) is fixedly connected to the lower end of the mixing shaft, and a top mixing rod is fixedly connected to the upper end. The top and bottom mixing rods are arranged in a staggered, layered manner on the mixing shaft, forming a mixing flow field with different heights and directions when the mixing shaft rotates, enhancing the mixing uniformity of the materials. The outer wall of the mixing shaft is also equipped with a scraping structure for scraping off materials adhering to the inner wall of the polymerization reactor.

[0020] All of the above electrical components are automatically controlled by an external PLC controller. Specifically, the control terminals of the solenoid valve 22, servo motor 32, temperature detector 310, temperature control jacket 30 (such as heating / cooling medium regulating valve), and delivery pump 21 are electrically connected to the input and output terminals of the PLC controller via signal cables.

[0021] In use, the initiator is pumped from the delivery pump 21 to the solenoid valve 22 via the delivery pipe 2. After the solenoid valve 22 is opened, the initiator enters the delivery cylinder 31. The servo motor 32 is started, which drives the transmission rod 320 and the spiral blade 321 to rotate. The spiral blade 321 applies axial thrust to the initiator entering the delivery cylinder 31, quickly pushing the initiator to the delivery pipe 33 at the bottom of the delivery cylinder 31, and then into the interior of the reactor body 1 through the delivery pipe 33.

[0022] During the conveying process, the temperature detector 310 monitors the temperature inside the conveying cylinder 31 in real time. When the temperature deviates from the set range, circulating cooling water or heating medium is introduced into the conveying cylinder 31 through the temperature control jacket 30 to adjust the wall temperature of the conveying cylinder 31, so that the initiator is kept in a suitable temperature range during the conveying process.

[0023] Example 2: Based on the above embodiment one: (refer to...) Figures 2-5 The structure shown; Unlike Embodiment 1, the inner end of the conveying cylinder 31 near the flange 220 is provided with an energy-concentrating ring 38, and the inner ring of the energy-concentrating ring 38 is provided with a plurality of energy-concentrating grooves 301. One end of the outer wall of the conveying cylinder 31 is fitted with an annular diverter pipe 36, and an air inlet pipe 35 is embedded on one side of the annular diverter pipe 36. A valve 34 is provided at the end of the air inlet pipe 35. The annular diverter pipe 36 near the solenoid valve 22 is provided with a plurality of air supply pipes 37, and the air supply pipes 37 extend through the flange 220 into the conveying cylinder 31. An air outlet pipe 311 is embedded at the upper end of one side of the conveying cylinder 31. The inner groove of the energy-concentrating ring 38 is cone-shaped, and the energy-concentrating groove 301 corresponds to the output port of the gas transmission pipe 37. The axial diameter of the energy-concentrating groove 301 is distributed in a decreasing manner, and the energy-concentrating groove 301 is arranged at an angle. Several gas transmission pipes 37 are unidirectional channels.

[0024] The energy-concentrating tank 301 is cone-shaped, meaning its axial diameter decreases progressively, and it is arranged at an angle. The energy-concentrating tank 301 guides and accelerates the initiator as it enters the conveying cylinder 31, altering its flow state and reducing its retention and adhesion to the wall at the inlet end of the conveying cylinder 31.

[0025] Nitrogen does not react with the initiator.

[0026] In use, this embodiment adds a nitrogen gas curtain protection and a focusing guide structure to the above embodiment one. After the solenoid valve 22 is opened, the initiator enters the conveying cylinder 31 through the conveying pipe 2. When the initiator enters the inlet end of the conveying cylinder 31, the conical focusing groove 301 on the focusing ring 38 guides and accelerates the initiator, changes the flow state of the initiator, and reduces the retention and wall adhesion of the initiator at the inlet end of the conveying cylinder 31.

[0027] Simultaneously, valve 34 is opened, and nitrogen gas enters the annular diversion pipe 36 through the inlet pipe 35. After being diverted by the annular diversion pipe 36, it passes through several gas delivery pipes 37 and flange 220 into the interior of the conveying cylinder 31. The nitrogen gas entering the conveying cylinder 31 is ejected through the focusing groove 301 on the focusing ring 38. Because the focusing groove 301 is conical and inclined, the nitrogen gas is accelerated by the focusing groove 301 and forms a continuous and stable gas curtain protective layer along the inner wall of the conveying cylinder 31. This gas curtain physically isolates the main fluid of the initiator from the inner wall of the conveying cylinder 31, reducing the direct contact between the initiator and the metal wall and disrupting the adhesion conditions required for the initiator to self-polymerize on the wall. The nitrogen gas curtain persists during the initiator delivery process and works in conjunction with the mechanical pushing of the spiral blades 321 to jointly propel the initiator rapidly through the conveying cylinder 31. At the same time, the continuous purging of the air curtain also scours the inner wall of the conveying cylinder 31, further preventing the initiator from being retained and self-polymerized at the connection between the flange 220 and the conveying cylinder 31 due to changes in the flow channel cross section.

[0028] A gas outlet pipe 311 embedded at the upper end of one side of the conveying cylinder 31 is used to discharge nitrogen gas and maintain the pressure balance inside the conveying cylinder 31. The shear force generated by the rotation of the spiral blade 321 continuously disturbs the initiator, destroying the initiator retention layer at the pipe wall.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clog-resistant polymerization reactor initiator addition device, comprising a reactor body (1), a conveying pipeline (2), a conveying pump (21), and a solenoid valve (22), characterized in that, An anti-clogging component (3) is provided between the electromagnetic valve (22) and the vessel body (1). The anti-clogging component (3) includes a conveying cylinder (31) provided between the electromagnetic valve (22) and the vessel body (1). One end of the conveying cylinder (31) is provided with a flange (220), and the conveying cylinder (31) is bolted to the electromagnetic valve (22) through the flange (220). A servo motor (32) is installed at the end of the conveying cylinder (31). A transmission rod (320) is connected to the output end of the servo motor (32). A spiral blade (321) is connected to the rod wall of the transmission rod (320). A conveying pipe (33) is embedded on one side of the bottom end of the conveying cylinder (31). The inner end of the conveying cylinder (31) near the flange (220) is provided with an energy-concentrating ring (38). The inner ring of the energy-concentrating ring (38) is provided with several energy-concentrating grooves (301). One end of the outer wall of the conveying cylinder (31) is fitted with an annular diverter pipe (36). An air inlet pipe (35) is embedded on one side of the annular diverter pipe (36). A valve (34) is provided at the end of the air inlet pipe (35). Several air delivery pipes (37) are provided on the side of the annular diverter pipe (36) near the solenoid valve (22). The air delivery pipes (37) extend through the flange (220) into the conveying cylinder (31). An air outlet pipe (311) is embedded at the upper end of one side of the conveying cylinder (31).

2. The anti-clogging polymerization reactor initiator addition device according to claim 1, characterized in that: The inner end of the vessel body (1) is provided with a stirring assembly, and the bottom of the vessel body (1) is provided with a support leg and a discharge pipe.

3. The anti-clogging polymerization reactor initiator addition device according to claim 1, characterized in that: Temperature detectors (310) are embedded on both sides of the top of the conveying cylinder (31), and a temperature control jacket (30) is fitted around the outer periphery of the conveying cylinder (31).

4. The anti-clogging polymerization reactor initiator addition device according to claim 1, characterized in that: The inner groove of the energy-concentrating ring (38) is cone-shaped, and the energy-concentrating groove (301) corresponds to the output port of the gas transmission pipe (37).

5. The anti-clogging polymerization reactor initiator addition device according to claim 4, characterized in that: The axial diameter of the energy-concentrating trough (301) is distributed in a decreasing manner, and the energy-concentrating trough (301) is arranged in an inclined manner.

6. The anti-clogging polymerization reactor initiator addition device according to claim 1, characterized in that: Several of the gas supply pipes (37) are configured as unidirectional channels.

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