Polymerizing kettle liquid level monitoring device

By installing a liquid level monitor on the polymerization reactor, the problem of insufficient liquid level monitoring in large polymerization reactors was solved, enabling real-time control of the liquid level and termination of the reaction, thus ensuring the safe and stable operation of the polymerization reactor.

CN224194726UActive Publication Date: 2026-05-05SHAANXI BEIYUAN CHEM GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHAANXI BEIYUAN CHEM GROUP
Filing Date
2025-05-06
Publication Date
2026-05-05

AI Technical Summary

Technical Problem

In existing technologies, polymerization reactors with a capacity of 100m³ or more cannot effectively monitor the liquid level inside the reactor during the addition of liquid vinyl chloride monomer and the reaction process. This can lead to excessively high liquid levels, causing increased reactor pressure and potentially resulting in leakage of vinyl chloride from weak points.

Method used

A liquid level monitor is installed on the polymerization reactor to monitor the liquid level in real time. When the high alarm value is reached, the liquid addition operation is stopped and the reaction is terminated by a terminator to avoid pressure rise caused by excessive liquid level.

Benefits of technology

It enables real-time monitoring and control of the liquid level in the polymerization reactor, avoiding pressure rise and vinyl chloride leakage caused by excessively high liquid levels, and improving the stable operation of the polymerization reactor and the production system.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a polymerization kettle liquid level monitoring device which comprises a polymerization kettle, the volume of the polymerization kettle is not less than 100m, and a liquid level monitor, a liquid-phase vinyl chloride monomer inlet, a terminator inlet and an initiator inlet are respectively arranged on an upper sealing head of the polymerization kettle. The liquid-phase vinyl chloride monomer inlet is sequentially connected with a liquid-phase vinyl chloride monomer feeding pump and a liquid-phase vinyl chloride monomer storage tank through a liquid-phase vinyl chloride monomer storage tank discharging pipeline, and the terminator inlet is sequentially connected with a terminator storage tank outlet valve and a terminator storage tank through a terminator storage tank discharging pipeline. The initiator inlet is connected with an initiator feeding pump through an initiator feeding pipeline which is connected with one end of an initiator water injection pipeline, and the other end of the initiator water injection pipeline is connected with a water injection pump. By arranging the liquid level monitor, when the liquid level in the polymerization kettle is too high and reaches a liquid level index high alarm value, the operation of adding a liquid-phase vinyl chloride monomer into the polymerization kettle is stopped, and a terminating agent is added to terminate the reaction of the polymerization kettle, so that the stable operation of the polymerization kettle and a production system is improved.
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Description

Technical Field

[0001] This utility model belongs to the field of chemical polyvinyl chloride and relates to a liquid level monitoring device for a polymerization reactor. Background Technology

[0002] Vinyl chloride is a colorless liquid at room temperature and pressure, heavier than air, and has a numbing aromatic odor. It is flammable and explosive, with an explosive range of 3.6% to 31% in air and 3.6% to 72% in oxygen. It can ignite and explode when exposed to external ignition sources or static electricity.

[0003] During the feeding process of the polymerization reactor, liquid vinyl chloride monomer is added, and water needs to be injected into the agitator seal and initiator inlet lines during the polymerization reaction. If the amount of water injected into these lines is excessive, it can lead to an increase in reactor pressure due to excessively high liquid levels. Currently, the liquid level in the reactor cannot be effectively monitored during the addition of liquid vinyl chloride monomer and the reaction process, resulting in increased reactor pressure due to excessively high liquid levels and potential leakage of vinyl chloride from weak points in the polymerization reactor. Utility Model Content

[0004] The purpose of this invention is to provide a liquid level monitoring device for polymerization reactors with a capacity of 100m³ or more. This device solves the problem in the prior art where the liquid level in a polymerization reactor with a capacity of 100m³ or more cannot be effectively monitored during the addition of liquid vinyl chloride monomer and the reaction process, leading to increased pressure in the reactor due to excessively high liquid level and leakage of vinyl chloride from weak points in the polymerization reactor.

[0005] The technical solution of this utility model is as follows:

[0006] A polymerization reactor level monitoring device includes a polymerization reactor with a volume of not less than 100 m³. A level monitor, a liquid vinyl chloride monomer inlet, a terminator inlet, and an initiator inlet are respectively installed on the upper end of the polymerization reactor. The liquid vinyl chloride monomer inlet is connected sequentially to a liquid vinyl chloride monomer feeding pump and a liquid vinyl chloride monomer storage tank via a liquid vinyl chloride monomer storage tank discharge pipe. The terminator inlet is connected sequentially to a terminator storage tank outlet valve and a terminator storage tank via a terminator storage tank discharge pipe. The initiator inlet is connected to an initiator feeding pump via an initiator feeding pipe. One end of the initiator feeding pipe is connected to an initiator water injection pipe, and the other end of the initiator water injection pipe is connected to a water injection pump.

[0007] The features of this utility model also include:

[0008] Connect the initiator water injection pipeline to the initiator water injection flow meter.

[0009] The initiator water injection pipeline is also connected to the initiator water injection regulating valve, and the initiator water injection flow meter is electrically connected to the initiator water injection regulating valve.

[0010] The initiator feeding pipeline is also connected to the initiator feeding valve, which is located at the connection between the initiator water injection pipeline and the initiator feeding pipeline and between the initiator feeding pump.

[0011] The discharge pipeline of the liquid vinyl chloride monomer storage tank is also connected to the outlet valve of the liquid vinyl chloride monomer feed pump, which is located between the liquid vinyl chloride monomer feed pump and the liquid vinyl chloride monomer inlet.

[0012] The outlet valve of the liquid-phase vinyl chloride monomer feed pump is connected to the liquid-phase vinyl chloride monomer feed pump via a discharge pipe from the liquid-phase vinyl chloride monomer storage tank, and is also connected to the outlet flow meter of the liquid-phase vinyl chloride monomer feed pump.

[0013] The water injection pump is connected in sequence to the water injection regulating valve and the polymer reactor agitator seal via the water injection pipeline of the polymer reactor agitator seal.

[0014] The inlet end of the water injection pipe of the polymerization reactor agitator is connected to the initiator water injection pipe, and the connection is located between the water injection pump and the water injection regulating valve of the polymerization reactor agitator.

[0015] A flow meter for the sealing water of the polymerization reactor agitator is connected to the sealing water pipeline, and is electrically connected to the sealing water regulating valve of the polymerization reactor agitator.

[0016] The beneficial effects of this utility model are:

[0017] This invention allows for direct monitoring of the liquid level in the polymerization reactor. Based on a pre-set high-level alarm, the reactor will stop adding liquid vinyl chloride monomer when the liquid level reaches the high alarm value. When the liquid level monitoring device detects a high-high alarm value during the polymerization reaction, operators can determine the cause and add a terminator to stop the reaction, thus improving the stability of the polymerization reactor and the production system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram, 1. Liquid vinyl chloride monomer storage tank, 2. Liquid vinyl chloride monomer feed pump, 3. Liquid vinyl chloride monomer feed pump outlet valve, 4. Liquid vinyl chloride monomer feed pump outlet flow meter, 5. Polymerization reactor, 6. Liquid level monitoring device, 7. Water injection pump, 8. Initiator water injection regulating valve, 9. Initiator water injection flow meter, 10. Terminator storage tank, 11. Terminator storage tank outlet valve, 12. Initiator feed pump, 13. Initiator feed valve, 14. Polymerization reactor agitator seal water injection regulating valve, 15. Polymerization reactor agitator seal water injection flow meter, 16. Polymerization reactor agitation system, 17. Polymerization reactor agitator seal, 18. Liquid vinyl chloride monomer inlet, 19. Terminator inlet, 20. Initiator inlet, 21. Liquid vinyl chloride monomer storage tank discharge pipe, 22. Terminator storage tank discharge pipe, 23. Initiator feed pipe, 24. Initiator water injection pipe, 25. Polymerization reactor agitator seal water injection pipe. Detailed Implementation

[0020] The following detailed description is provided in conjunction with specific implementation methods.

[0021] like Figure 1 As shown, the polymerization reactor level monitoring device includes a polymerization reactor 5 with a volume of not less than 100 m³. The polymerization reactor 5 has an internal polymerization reactor stirring system 16, and a polymerization reactor agitator seal 17 at the bottom. A level monitor 6 is installed on one side of the upper head of the polymerization reactor 5, and a liquid vinyl chloride monomer inlet 18, a terminator inlet 19, and an initiator inlet 20 are opened on the other side. The liquid vinyl chloride monomer inlet 18 is connected in sequence to the liquid vinyl chloride monomer feed pump outlet valve 3, the liquid vinyl chloride monomer feed pump outlet flow meter 4, the liquid vinyl chloride monomer feed pump 2, and the liquid vinyl chloride monomer storage tank 1 via a liquid vinyl chloride monomer storage tank discharge pipe 21. The terminator inlet 19 is connected in sequence to the terminator storage tank outlet valve 11 and the terminator storage tank 10 via a terminator storage tank discharge pipe 22. The initiator inlet 20 is connected in sequence to the initiator feed valve 13 and the initiator feed pump 12 via an initiator feed pipe 23.

[0022] The water injection pump 7 is connected in sequence to the initiator water injection flow meter 9 and the initiator water injection regulating valve 8 via the initiator water injection pipeline 24. The initiator water injection flow meter 9 and the initiator water injection regulating valve 8 are electrically connected, and the flow rate is controlled by the regulating valve. The outlet end of the initiator water injection pipeline 24 is connected to the initiator feeding pipeline 23, and the connection point is located between the initiator feeding valve 13 and the initiator inlet 20.

[0023] The polymerization reactor agitator seal 17 has a connection port. The water injection pump 7 is connected in sequence to the polymerization reactor agitator seal water injection flow meter 15, the polymerization reactor agitator seal water injection regulating valve 14, and the polymerization reactor agitator seal 17 via the polymerization reactor agitator seal water injection pipe 25. The polymerization reactor agitator seal water injection flow meter 15 and the polymerization reactor agitator seal water injection regulating valve 14 are electrically connected. The water inlet end of the polymerization reactor agitator seal water injection pipe 25 is connected to the initiator water injection pipe 24, and the connection point is located between the water injection pump 7 and the polymerization reactor agitator seal water injection regulating valve 14.

[0024] Before feeding the polymer reactor 5, start the initiator feeding pump 12, open the initiator feeding valve 13, and feed the initiator into the polymer reactor 5 through the initiator feeding pipe 23 and the initiator inlet 20. Then, close the initiator feeding valve 13 and then close the initiator feeding pump 12.

[0025] During the feeding process of polymerization reactor 5, the liquid vinyl chloride monomer in liquid vinyl chloride monomer storage tank 1 enters the liquid vinyl chloride monomer feeding pump 2 through the liquid vinyl chloride monomer storage tank discharge pipe 21. The outlet valve 3 of the liquid vinyl chloride monomer feeding pump is opened, and the liquid vinyl chloride monomer feeding pump 2 is started. The liquid vinyl chloride is metered by the liquid vinyl chloride monomer feeding pump outlet flow meter 4 and added into polymerization reactor 5 through liquid vinyl chloride monomer inlet 18. When the liquid level indicator of the liquid level monitor 6 reaches the high-high alarm value, the outlet valve 3 of the liquid vinyl chloride monomer feeding pump is closed, and the liquid vinyl chloride monomer feeding pump 2 stops adding vinyl chloride into polymerization reactor 5.

[0026] During the polymerization reactor reaction, when the liquid level indicator 6 reaches the high-high alarm value, the operator analyzes the reaction process based on the alarm information. If the analysis indicates that the excessive liquid level is due to water injection, the operator opens the outlet valve 11 of the terminator storage tank and adds the terminator from the terminator storage tank 10 to the polymerization reactor 5 through the terminator inlet 19 via the terminator discharge pipe 22 to terminate the polymerization reaction. This prevents pressure rise in the polymerization reactor due to excessive liquid level, thus avoiding leakage of vinyl chloride from weak points in the polymerization reactor.

[0027] When water is injected into the initiator feeding pipeline 23, the water is pumped through the initiator water injection pipeline 24 by the water injection pump 7, and regulated by the initiator water injection flow meter 9 and the initiator water injection regulating valve 8 to inject water into the initiator feeding pipeline 23.

[0028] When water is injected into the polymerization reactor agitator seal 17, the water is pumped through the water injection pump 7, and then through the polymerization reactor agitator seal water injection pipe 25, the polymerization reactor agitator seal water injection flow meter 15, and the polymerization reactor agitator seal water injection regulating valve 14 to regulate the water injection into the polymerization reactor agitator seal 17.

[0029] The liquid level monitor 6 mainly consists of a high-frequency radar antenna, a waveguide, and a signal processor. The high-frequency radar antenna is mainly used to transmit microwave pulses or frequency-modulated continuous waves; the signal processor mainly analyzes the microwave reflection signal to calculate reliable and accurate liquid level data; and the waveguide mainly guides the microwaves to propagate in the medium and prevents them from diverging in open spaces.

[0030] Example 1

[0031] The polymerization reactor level monitoring device includes a polymerization reactor 5 with a volume of not less than 100 m³. A level monitor 6, a liquid vinyl chloride monomer inlet 18, a terminator inlet 19, and an initiator inlet 20 are respectively installed on the upper end of the polymerization reactor 5. The liquid vinyl chloride monomer inlet 18 is connected to the liquid vinyl chloride monomer feeding pump 2 and the liquid vinyl chloride monomer storage tank 1 in sequence through the liquid vinyl chloride monomer storage tank discharge pipe 21. The terminator inlet 19 is connected to the terminator storage tank outlet valve 11 and the terminator storage tank 10 in sequence through the terminator storage tank discharge pipe 22. The initiator inlet 20 is connected to the initiator feeding pump 12 through the initiator feeding pipe 23. The initiator feeding pipe 23 is connected to one end of the initiator water injection pipe 24, and the other end of the initiator water injection pipe 24 is connected to the water injection pump 7.

[0032] Example 2

[0033] The polymerization reactor level monitoring device includes a polymerization reactor 5 with a volume of not less than 100 m³. A level monitor 6, a liquid vinyl chloride monomer inlet 18, a terminator inlet 19, and an initiator inlet 20 are respectively installed on the upper end of the polymerization reactor 5. The liquid vinyl chloride monomer inlet 18 is connected to the liquid vinyl chloride monomer feeding pump 2 and the liquid vinyl chloride monomer storage tank 1 in sequence through the liquid vinyl chloride monomer storage tank discharge pipe 21. The terminator inlet 19 is connected to the terminator storage tank outlet valve 11 and the terminator storage tank 10 in sequence through the terminator storage tank discharge pipe 22. The initiator inlet 20 is connected to the initiator feeding pump 12 through the initiator feeding pipe 23. The initiator feeding pipe 23 is connected to one end of the initiator water injection pipe 24, and the other end of the initiator water injection pipe 24 is connected to the water injection pump 7.

[0034] The initiator water injection pipe 24 is connected to the initiator water injection flow meter 9.

[0035] Example 3

[0036] The polymerization reactor level monitoring device includes a polymerization reactor 5 with a volume of not less than 100 m³. A level monitor 6, a liquid vinyl chloride monomer inlet 18, a terminator inlet 19, and an initiator inlet 20 are respectively installed on the upper end of the polymerization reactor 5. The liquid vinyl chloride monomer inlet 18 is connected to the liquid vinyl chloride monomer feeding pump 2 and the liquid vinyl chloride monomer storage tank 1 in sequence through the liquid vinyl chloride monomer storage tank discharge pipe 21. The terminator inlet 19 is connected to the terminator storage tank outlet valve 11 and the terminator storage tank 10 in sequence through the terminator storage tank discharge pipe 22. The initiator inlet 20 is connected to the initiator feeding pump 12 through the initiator feeding pipe 23. The initiator feeding pipe 23 is connected to one end of the initiator water injection pipe 24, and the other end of the initiator water injection pipe 24 is connected to the water injection pump 7.

[0037] The initiator water injection pipe 24 is connected to the initiator water injection flow meter 9.

[0038] The initiator water injection pipeline 24 is also connected to the initiator water injection regulating valve 8, and the initiator water injection flow meter 9 is electrically connected to the initiator water injection regulating valve 8.

[0039] Example 4

[0040] The polymerization reactor level monitoring device includes a polymerization reactor 5 with a volume of not less than 100 m³. A level monitor 6, a liquid vinyl chloride monomer inlet 18, a terminator inlet 19, and an initiator inlet 20 are respectively installed on the upper end of the polymerization reactor 5. The liquid vinyl chloride monomer inlet 18 is connected to the liquid vinyl chloride monomer feeding pump 2 and the liquid vinyl chloride monomer storage tank 1 in sequence through the liquid vinyl chloride monomer storage tank discharge pipe 21. The terminator inlet 19 is connected to the terminator storage tank outlet valve 11 and the terminator storage tank 10 in sequence through the terminator storage tank discharge pipe 22. The initiator inlet 20 is connected to the initiator feeding pump 12 through the initiator feeding pipe 23. The initiator feeding pipe 23 is connected to one end of the initiator water injection pipe 24, and the other end of the initiator water injection pipe 24 is connected to the water injection pump 7.

[0041] The initiator feeding pipe 23 is also connected to the initiator feeding valve 13, which is located between the connection point of the initiator water injection pipe 24 and the initiator feeding pipe 23 and the initiator feeding pump 12.

[0042] Example 5

[0043] The polymerization reactor level monitoring device includes a polymerization reactor 5 with a volume of not less than 100 m³. A level monitor 6, a liquid vinyl chloride monomer inlet 18, a terminator inlet 19, and an initiator inlet 20 are respectively installed on the upper end of the polymerization reactor 5. The liquid vinyl chloride monomer inlet 18 is connected to the liquid vinyl chloride monomer feeding pump 2 and the liquid vinyl chloride monomer storage tank 1 in sequence through the liquid vinyl chloride monomer storage tank discharge pipe 21. The terminator inlet 19 is connected to the terminator storage tank outlet valve 11 and the terminator storage tank 10 in sequence through the terminator storage tank discharge pipe 22. The initiator inlet 20 is connected to the initiator feeding pump 12 through the initiator feeding pipe 23. The initiator feeding pipe 23 is connected to one end of the initiator water injection pipe 24, and the other end of the initiator water injection pipe 24 is connected to the water injection pump 7.

[0044] The liquid-phase vinyl chloride monomer storage tank discharge pipe 21 is also connected to the liquid-phase vinyl chloride monomer feed pump outlet valve 3, which is located between the liquid-phase vinyl chloride monomer feed pump 2 and the liquid-phase vinyl chloride monomer inlet 18.

[0045] Example 6

[0046] The polymerization reactor level monitoring device includes a polymerization reactor 5 with a volume of not less than 100 m³. A level monitor 6, a liquid vinyl chloride monomer inlet 18, a terminator inlet 19, and an initiator inlet 20 are respectively installed on the upper end of the polymerization reactor 5. The liquid vinyl chloride monomer inlet 18 is connected to the liquid vinyl chloride monomer feeding pump 2 and the liquid vinyl chloride monomer storage tank 1 in sequence through the liquid vinyl chloride monomer storage tank discharge pipe 21. The terminator inlet 19 is connected to the terminator storage tank outlet valve 11 and the terminator storage tank 10 in sequence through the terminator storage tank discharge pipe 22. The initiator inlet 20 is connected to the initiator feeding pump 12 through the initiator feeding pipe 23. The initiator feeding pipe 23 is connected to one end of the initiator water injection pipe 24, and the other end of the initiator water injection pipe 24 is connected to the water injection pump 7.

[0047] The outlet valve 3 of the liquid-phase vinyl chloride monomer feed pump is connected to the liquid-phase vinyl chloride monomer feed pump 2 via the liquid-phase vinyl chloride monomer storage tank discharge pipe 21, which is connected to the outlet flow meter 4 of the liquid-phase vinyl chloride monomer feed pump.

[0048] Example 7

[0049] The polymerization reactor level monitoring device includes a polymerization reactor 5 with a volume of not less than 100 m³. A level monitor 6, a liquid vinyl chloride monomer inlet 18, a terminator inlet 19, and an initiator inlet 20 are respectively installed on the upper end of the polymerization reactor 5. The liquid vinyl chloride monomer inlet 18 is connected to the liquid vinyl chloride monomer feeding pump 2 and the liquid vinyl chloride monomer storage tank 1 in sequence through the liquid vinyl chloride monomer storage tank discharge pipe 21. The terminator inlet 19 is connected to the terminator storage tank outlet valve 11 and the terminator storage tank 10 in sequence through the terminator storage tank discharge pipe 22. The initiator inlet 20 is connected to the initiator feeding pump 12 through the initiator feeding pipe 23. The initiator feeding pipe 23 is connected to one end of the initiator water injection pipe 24, and the other end of the initiator water injection pipe 24 is connected to the water injection pump 7.

[0050] Water injection pump 7 is connected in sequence to water injection regulating valve 14 and polymer reactor agitator seal 17 via water injection pipeline 25.

[0051] Example 8

[0052] The polymerization reactor level monitoring device includes a polymerization reactor 5 with a volume of not less than 100 m³. A level monitor 6, a liquid vinyl chloride monomer inlet 18, a terminator inlet 19, and an initiator inlet 20 are respectively installed on the upper end of the polymerization reactor 5. The liquid vinyl chloride monomer inlet 18 is connected to the liquid vinyl chloride monomer feeding pump 2 and the liquid vinyl chloride monomer storage tank 1 in sequence through the liquid vinyl chloride monomer storage tank discharge pipe 21. The terminator inlet 19 is connected to the terminator storage tank outlet valve 11 and the terminator storage tank 10 in sequence through the terminator storage tank discharge pipe 22. The initiator inlet 20 is connected to the initiator feeding pump 12 through the initiator feeding pipe 23. The initiator feeding pipe 23 is connected to one end of the initiator water injection pipe 24, and the other end of the initiator water injection pipe 24 is connected to the water injection pump 7.

[0053] Water injection pump 7 is connected in sequence to water injection regulating valve 14 and polymer reactor agitator seal 17 via water injection pipeline 25.

[0054] The inlet end of the water injection pipe 25 of the polymerization reactor agitator is connected to the initiator water injection pipe 24, and the connection is located between the water injection pump 7 and the water injection regulating valve 14 of the polymerization reactor agitator.

[0055] Example 9

[0056] The polymerization reactor level monitoring device includes a polymerization reactor 5 with a volume of not less than 100 m³. A level monitor 6, a liquid vinyl chloride monomer inlet 18, a terminator inlet 19, and an initiator inlet 20 are respectively installed on the upper end of the polymerization reactor 5. The liquid vinyl chloride monomer inlet 18 is connected to the liquid vinyl chloride monomer feeding pump 2 and the liquid vinyl chloride monomer storage tank 1 in sequence through the liquid vinyl chloride monomer storage tank discharge pipe 21. The terminator inlet 19 is connected to the terminator storage tank outlet valve 11 and the terminator storage tank 10 in sequence through the terminator storage tank discharge pipe 22. The initiator inlet 20 is connected to the initiator feeding pump 12 through the initiator feeding pipe 23. The initiator feeding pipe 23 is connected to one end of the initiator water injection pipe 24, and the other end of the initiator water injection pipe 24 is connected to the water injection pump 7.

[0057] Water injection pump 7 is connected in sequence to water injection regulating valve 14 and polymer reactor agitator seal 17 via water injection pipeline 25.

[0058] A flow meter 15 for the injection water of the polymerization reactor agitator is connected to the injection water pipeline 25, and is electrically connected to the injection water regulating valve 14 of the polymerization reactor agitator.

Claims

1. A liquid level monitoring device for a polymerization reactor, characterized in that, The equipment includes a polymerization reactor (5) with a volume of not less than 100 m³. The upper end of the polymerization reactor (5) is equipped with a liquid level monitor (6), a liquid vinyl chloride monomer inlet (18), a terminator inlet (19), and an initiator inlet (20). The liquid vinyl chloride monomer inlet (18) is connected to the liquid vinyl chloride monomer feeding pump (2) and the liquid vinyl chloride monomer storage tank (1) in sequence through the liquid vinyl chloride monomer storage tank discharge pipe (21). The terminator inlet (19) is connected to the terminator storage tank outlet valve (11) and the terminator storage tank (10) in sequence through the terminator storage tank discharge pipe (22). The initiator inlet (20) is connected to the initiator feeding pump (12) through the initiator feeding pipe (23). The initiator feeding pipe (23) is connected to one end of the initiator water injection pipe (24), and the other end of the initiator water injection pipe (24) is connected to the water injection pump (7).

2. The polymerization reactor liquid level monitoring device according to claim 1, characterized in that, The initiator water injection pipe (24) is connected to the initiator water injection flow meter (9).

3. The polymerization reactor liquid level monitoring device according to claim 2, characterized in that, The initiator water injection pipeline (24) is also connected to the initiator water injection regulating valve (8), and the initiator water injection flow meter (9) is electrically connected to the initiator water injection regulating valve (8).

4. The polymerization reactor liquid level monitoring device according to claim 1, characterized in that, The initiator feeding pipe (23) is also connected to the initiator feeding valve (13), which is located at the connection between the initiator water injection pipe (24) and the initiator feeding pipe (23) and between the initiator feeding pump (12).

5. The polymerization reactor liquid level monitoring device according to claim 1, characterized in that, The liquid-phase vinyl chloride monomer storage tank discharge pipeline (21) is also connected to the liquid-phase vinyl chloride monomer feed pump outlet valve (3), which is located between the liquid-phase vinyl chloride monomer feed pump (2) and the liquid-phase vinyl chloride monomer inlet (18).

6. The polymerization reactor liquid level monitoring device according to claim 1, characterized in that, The outlet valve (3) of the liquid-phase vinyl chloride monomer feed pump and the liquid-phase vinyl chloride monomer feed pump (2) are connected to the outlet flow meter (4) of the liquid-phase vinyl chloride monomer feed pump through the discharge pipe (21) of the liquid-phase vinyl chloride monomer storage tank.

7. The polymerization reactor liquid level monitoring device according to claim 1, characterized in that, The water injection pump (7) is connected in sequence to the water injection regulating valve (14) and the polymer reactor agitator seal (17) via the water injection pipeline (25).

8. The polymerization reactor liquid level monitoring device according to claim 7, characterized in that, The inlet end of the water injection pipe (25) of the polymerization reactor agitator is connected to the initiator water injection pipe (24), and the connection is located between the water injection pump (7) and the water injection regulating valve (14) of the polymerization reactor agitator.

9. The polymerization reactor liquid level monitoring device according to claim 7, characterized in that, A flow meter (15) for the injection water pipe (25) of the polymerization reactor is connected to the injection water flow meter (15) and electrically connected to the injection water regulating valve (14) of the polymerization reactor.