Polymerization reactor spray coating system
Patent Information
- Application Number
- CN202522265206.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-27
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-10-27
AI Technical Summary
[0002]聚合釜运行过程中，随着聚合反应批次的增加，聚合釜釜顶的气相空间出现自聚粘结物，该处自聚粘结物增多逐渐形成大的块状自聚物，块状自聚物在反应过程中掉落后，不但堵塞出料过滤器导致出料不畅，而且会产生鱼眼影响PVC产品的质量
[0010]本实用新型的优点：采用涂壁前冲洗-涂壁-涂壁后冲洗的工艺步骤，其中涂壁前冲洗步骤目的在于对聚合釜内的残留杂质进行清洗，有效的保证了后续涂釜剂直接作用到聚合釜的内壁，减小了残留物对涂釜剂的影响；通过涂壁步骤在文丘里雾化器的作用下，使得涂釜剂与蒸汽融合促进了雾化效果，在涂壁后冲洗步骤的作用下，进一步的将聚合釜内残留的涂釜剂冲洗掉，减小了后续涂釜剂对聚合反应的影响，故对涂釜工艺以及喷淋进行改造优化，改善聚合釜釜顶的气相空间的喷涂效果，减少釜顶气相空间粘釜的情况，从而提高聚合釜的利用率，提升树脂产量，延长釜的清釜周期，减少作业频次，降低安全作业风险，实现本质化安全。
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Figure CN224807669U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of anti-sticking treatment technology for polymerization reactors, specifically to a polymerization reactor spraying treatment system. Background Technology
[0002] During the operation of the polymerization reactor, as the number of polymerization batches increases, self-polymerized agglomerates appear in the gas phase space at the top of the reactor. As the amount of self-polymerized agglomerates increases, they gradually form large blocky self-polymers. After these blocky self-polymers fall off during the reaction, they not only clog the discharge filter, causing poor discharge, but also produce fish-eye patterns, affecting the quality of PVC products.
[0003] Generally, cleaning the self-polymerized material from the polymerization reactor is necessary after 200-300 batches of operation (manual cleaning involves many special operations and poses significant safety risks). This not only affects the utilization rate of the polymerization reactor but also increases the labor intensity of the workers. The main reason for the self-polymerized material buildup in the polymerization reactor is the poor performance of the original coating process. The existing coating process uses steam to atomize the coating agent and directly deliver it into the polymerization reactor. This results in uneven coating of the agent on the inner surface of the reactor. After coating, the coating agent remains in the pipeline, causing blockages during later use and also affecting the coating effect. In addition, the polymerization reactor needs to be flushed with high-pressure water before the coating process. Currently, the main spray flushing water pipe and coating agent pipeline are laid around the polymerization reactor, resulting in complex wiring, increased maintenance costs, and space occupation. Utility Model Content
[0004] The purpose of this invention is to provide a spray coating system for a polymerization reactor.
[0005] This utility model is implemented by the following technical solution: a polymerization kettle spraying treatment system, which includes a polymerization kettle, a condenser, and a connecting pipe. The condenser is connected to the top of the polymerization kettle through the connecting pipe. It also includes a main flushing water pipe, a steam pipeline, a coating pipeline, an atomizer, a coating agent storage tank, a feed pump, a three-way valve a, a three-way valve b, and a three-way valve c. The top of the polymerization reactor is equipped with a polymerization reactor spray head, the top of the condenser is equipped with a condenser spray head, and the inner wall of the connecting pipe is equipped with a connecting pipe spray head. The ends of the main flushing water pipe are respectively connected to a first flushing branch pipe, a second flushing branch pipe and a third flushing branch pipe; The steam pipeline is connected to the high-pressure feed port of the atomizer, the outlet of the coating agent storage tank is connected to the low-pressure feed port pipeline of the atomizer through the feed pump, and the outlet of the atomizer is respectively connected to the first coating agent branch pipe, the second coating agent branch pipe and the third coating agent branch pipe; The first coating agent branch pipe and the first rinsing branch pipe are connected to the polymerization reactor spray head pipeline via a three-way valve a; The second coating agent branch pipe and the second flushing branch pipe are connected to the condenser spray head pipeline via a three-way valve b. The third coating agent branch pipe and the third rinsing branch pipe are connected to the connecting pipe spray head pipeline via a three-way valve c.
[0006] Furthermore, the polymerization reactor spray head, the condenser spray head, and the connecting pipe spray head are rotating spray heads.
[0007] Furthermore, the atomizer is a Venturi atomizer.
[0008] Furthermore, the bottom outlet of the polymerization reactor is connected to the inlet pipeline of the recovery tank.
[0009] Furthermore, the steam pipeline is equipped with a first flow meter, and the outlet of the feed pump is equipped with a second flow meter.
[0010] The advantages of this invention are as follows: It employs a pre-coating rinsing-coating-post-coating rinsing process. The pre-coating rinsing step aims to clean residual impurities inside the polymerization reactor, effectively ensuring that the subsequent coating agent directly acts on the inner wall of the reactor, reducing the impact of residues on the coating agent. During the coating step, the coating agent is fused with steam through a Venturi atomizer, promoting atomization. The post-coating rinsing step further removes residual coating agent from the polymerization reactor, reducing the impact of subsequent coating agents on the polymerization reaction. Therefore, the coating process and spraying are modified and optimized, improving the spraying effect in the gas phase space at the top of the polymerization reactor, reducing adhesion to the reactor, thereby increasing the utilization rate of the polymerization reactor, increasing resin production, extending the reactor cleaning cycle, reducing the frequency of operations, lowering safety risks, and achieving inherent safety. Attached Figure Description
[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0012] Figure 1 This is a system structure diagram of the utility model; In the diagram: 1. Polymerization reactor; 2. Condenser; 3. Connecting pipe; 4. Main flushing water pipe; 5. Steam pipeline; 6. Coating reactor pipeline; 7. Atomizer; 8. Coating agent storage tank; 9. Feed pump; 10. Three-way valve a; 11. Three-way valve b; 12. Three-way valve c; 1.1. Polymerization reactor spray head; 2.1. Condenser spray head; 3.1. Connecting pipe spray head; 13. First flushing branch pipe; 14. Second flushing branch pipe; 15. Third flushing branch pipe; 16. First coating agent branch pipe; 17. Second coating agent branch pipe; 18. Third coating agent branch pipe; 19. Recovery tank; 20. First flow meter; 21. Second flow meter. Detailed Implementation
[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0014] like Figure 1 As shown, the polymerization reactor spraying system includes a polymerization reactor 1, a condenser 2, and a connecting pipe 3. The condenser 2 is connected to the top of the polymerization reactor 1 through the connecting pipe 3. It also includes a main flushing water pipe 4, a steam pipeline 5, a coating pipeline 6, an atomizer 7, a coating agent storage tank 8, a feed pump 9, a three-way valve a10, a three-way valve b11, and a three-way valve c12. The top of the polymerization reactor 1 is equipped with a polymerization reactor spray head 1.1, the top of the condenser 2 is equipped with a condenser spray head 2.1, and the inner wall of the connecting pipe 3 is equipped with a connecting pipe spray head 3.1. The ends of the main flushing water pipe 4 are connected to the first flushing branch pipe 13, the second flushing branch pipe 14 and the third flushing branch pipe 15 respectively, and the water pressure of the main flushing water pipe 4 is 2 MPa.
[0015] Steam line 5 is connected to the high-pressure feed port of atomizer 7. Atomizer 7 is a Venturi atomizer 7. The outlet of coating agent storage tank 8 is connected to the low-pressure feed port of atomizer 7 through feed pump 9. The outlet of atomizer 7 is connected to the first coating agent branch pipe 16, the second coating agent branch pipe 17 and the third coating agent branch pipe 18 respectively. The first coating agent branch pipe 16 and the first flushing branch pipe 13 are connected to the polymerization reactor spray head 1.1 pipeline through a three-way valve a10; The second coating agent branch pipe 17 and the second flushing branch pipe 14 are connected to the condenser spray head 2.1 pipeline through the three-way valve b11; The third coating agent branch pipe 18 and the third flushing branch pipe 15 are connected to the connecting pipe spray head 3.1 pipeline via a three-way valve c12.
[0016] The polymerization reactor spray head 1.1, the condenser spray head 2.1, and the connecting pipe spray head 3.1 are rotating spray heads.
[0017] The bottom outlet of polymerization reactor 1 is connected to the inlet pipeline of recovery tank 19.
[0018] The steam pipeline 5 is equipped with a first flow meter 20, and the outlet of the feed pump 9 is equipped with a second flow meter 21. The first flow meter 20 and the second flow meter 21 are used to control the addition ratio of steam and coating agent.
[0019] This application adopts a process of pre-coating rinsing, coating, and post-coating rinsing. The pre-coating rinsing step aims to clean residual impurities in the polymerization reactor 1, effectively ensuring that the subsequent coating agent directly acts on the inner wall of the polymerization reactor 1, reducing the impact of residues on the coating agent. Through the action of the Venturi atomizer 7 in the coating step, the coating agent and steam are fused together, promoting the atomization effect. Under the action of the post-coating rinsing step, the residual coating agent in the polymerization reactor 1 is further washed away, reducing the impact of the subsequent coating agent on the polymerization reaction. Therefore, the coating process and spraying are modified and optimized to improve the spraying effect of the gas phase space at the top of the polymerization reactor 1, reduce the adhesion of the gas phase space at the top of the reactor, thereby improving the utilization rate of the polymerization reactor 1, increasing resin production, extending the reactor cleaning cycle, reducing the frequency of operation, reducing the risk of safety operation, and achieving inherent safety.
[0020] The specific operation process of this embodiment is as follows: 1. Coating process for polymerization reactor 1: pre-coating rinsing - coating - post-coating rinsing; 1.1 Rinsing steps before coating: Switch the three-way valves a10, b11, and c12 to the first flushing branch pipe 13, the second flushing branch pipe 14, and the third flushing branch pipe 15 respectively, so that the flushing water in the main flushing water pipe 4 enters the polymerization reactor 1 through the polymerization reactor spray head 1.1, enters the condenser 2 through the condenser spray head 2.1, and enters the connecting pipe 3 through the connecting pipe spray head 3.1. Under the action of the polymerization reactor spray head 1.1, the condenser spray head 2.1, and the connecting pipe spray head 3.1, the internal residues are flushed, reducing the impact of residues on the effect of the coating agent. 1.2. Coating steps: Switch the three-way valves a10, b11, and c12 to the conducting side of the first coating agent branch pipe 16, the second coating agent branch pipe 17, and the third coating agent branch pipe 18, respectively. Start the feed pump 9. Steam enters the high-pressure inlet of the Venturi atomizer 7, and the coating agent enters the low-pressure inlet of the Venturi atomizer 7 via the feed pump 9. Through the atomization effect of the Venturi atomizer 7, the coating agent is atomized and enters the polymerization reactor 1 through the first coating agent branch pipe 16 and the polymerization reactor spray head 1.1, enters the condenser 2 through the second coating agent branch pipe 17 and the condenser spray head 2.1, and enters the connecting pipe 3 through the third coating agent branch pipe 18 and the connecting pipe spray head 3.1, thus spraying the coating agent into the polymerization reactor 1, the condenser 2, and the connecting pipe 3. 1.3 Post-coating flushing step: After a period of deposition of the coating agent, a post-coating flushing step is performed, which is the same as the pre-coating flushing step in 1.1. The purpose is to flush away the residual coating agent in the polymerization reactor 1, condenser 2 and connecting pipe 3, so as to reduce the subsequent impact on the polymerization reaction. At the same time, under the action of high-pressure flushing water, the coating agent inside the first coating agent branch pipe 16, the second coating agent branch pipe 17 and the third coating agent branch pipe 18 is flushed out. After a certain period of flushing, there is no coating agent residue in the polymerization reactor 1, the first coating agent branch pipe 16, the second coating agent branch pipe 17 and the third coating agent branch pipe 18. The flushing water is recycled into the recovery tank 19 and can be recycled and processed later.
[0021] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A polymerization reactor spraying system, comprising a polymerization reactor, a condenser, and a connecting pipe, wherein the condenser is connected to the top interior of the polymerization reactor via the connecting pipe, characterized in that, It also includes a main flushing water pipe, steam pipeline, coating tank pipeline, atomizer, coating agent storage tank, feed pump, three-way valve a, three-way valve b, and three-way valve c; The top of the polymerization reactor is equipped with a polymerization reactor spray head, the top of the condenser is equipped with a condenser spray head, and the inner wall of the connecting pipe is equipped with a connecting pipe spray head. The ends of the main flushing water pipe are respectively connected to a first flushing branch pipe, a second flushing branch pipe and a third flushing branch pipe; The steam pipeline is connected to the high-pressure feed port of the atomizer, the outlet of the coating agent storage tank is connected to the low-pressure feed port pipeline of the atomizer through the feed pump, and the outlet of the atomizer is respectively connected to the first coating agent branch pipe, the second coating agent branch pipe and the third coating agent branch pipe; The first coating agent branch pipe and the first rinsing branch pipe are connected to the polymerization reactor spray head pipeline via a three-way valve a; The second coating agent branch pipe and the second flushing branch pipe are connected to the condenser spray head pipeline via a three-way valve b. The third coating agent branch pipe and the third rinsing branch pipe are connected to the connecting pipe spray head pipeline via a three-way valve c.
2. The polymerization reactor spraying treatment system according to claim 1, characterized in that, The polymerization reactor spray head, the condenser spray head, and the connecting pipe spray head are rotating spray heads.
3. The polymerization reactor spraying treatment system according to claim 2, characterized in that, The atomizer is a Venturi atomizer.
4. The polymerization reactor spraying treatment system according to claim 3, characterized in that, The bottom outlet of the polymerization reactor is connected to the inlet pipeline of the recovery tank.
5. The polymerization reactor spraying treatment system according to claim 4, characterized in that, The steam pipeline is equipped with a first flow meter, and the outlet of the feed pump is equipped with a second flow meter.