A neoprene synthesis column group and a control method thereof

Abstract

The application provides a neoprene synthesis tower group and a control method thereof, and belongs to the technical field of chemical production. The technical problem to be solved is that there is a lack of multi-tower linkage control scheme in the prior art. The technical scheme for solving the technical problem is that a first material tank, a second material tank, a first synthesis tower, a second synthesis tower and a third synthesis tower are provided. The output end of the second material tank is connected with the input end of a resolving tower. The output end of the resolving tower is connected with the input ends of the three synthesis towers through a second material main pipe and adjusting valves respectively. The output end of the first material tank is connected with the input ends of the three synthesis towers through adjusting valves respectively. Liquid level sensors are arranged in the first material tank and the second material tank. A pressure sensor is arranged in the second material main pipe. Mass flow meters are arranged at the input ends of the three synthesis towers. A control system is electrically connected with the liquid level sensors, the pressure sensor, the mass flow meters and the adjusting valves respectively. The application is applied to the synthesis of neoprene.

Description

Technical Field

[0001] This application relates to the field of chemical production technology, and in particular to a chloroprene rubber synthesis tower assembly and its control method. Background Technology

[0002] Currently, most publicly available patents related to synthesis towers are concentrated in the field of chemical equipment such as urea synthesis towers and methanol synthesis towers. These patents mainly focus on the optimization of the mechanical structure of the synthesis tower equipment itself, the modification of internal components, and the design of independent control logic for a single tower. For example, the utility model patent with publication number CN224086762U, entitled "A High-Efficiency Tray Device for Urea Synthesis Tower," addresses the shortcomings of existing technologies in promoting gas-liquid phase mixing reactions by using multiple bottom plates, side arc plates, and side connecting plates to form multiple unit mixing zones, thereby improving the uniformity of gas-liquid mixing. The height difference between the side arc plates, side connecting plates, and the top plate increases the residence time of the liquid phase on the top plate end face, extending the gas-liquid mixing reaction time. The inclusion of flow-damping plates, flow-damping holes, and vibrating balls increases the gas phase flow path and reduces the flow velocity, promoting sufficient gas-liquid contact. Furthermore, the vibration of the top plate caused by the gas phase impacting the vibrating balls refines bubbles, increasing the gas-liquid contact area and reaction effect. The modular assembly structure combines the advantages of convenient installation and individual disassembly and maintenance, reducing replacement and maintenance costs. For example, patent CN122044118A, entitled "A Flexible Control System for a Synthetic Ammonia System under Dynamic Load," discloses a synthesis tower determination module for determining the connection form between synthesis towers in the ammonia synthesis system and then sending it to the overall target load rate calculation module; the overall target load rate calculation module for determining the overall target load rate of all synthesis towers at the current moment based on the dynamic load at the current moment and then sending it to the allocation strategy determination module; the allocation strategy determination module for calculating the allocation strategy of all synthesis towers at the current moment based on the overall target load rate and then sending it to the optimal allocation strategy determination module; the optimal allocation strategy determination module for determining the optimal allocation strategy at the current moment and then sending it to the adjustment module; and the adjustment module for adjusting the actual load of the synthesis towers at the current moment based on the optimal allocation strategy at the current moment.

[0003] From the perspectives of industry attributes, process media, and reaction mechanisms, the aforementioned synthesis towers are fundamentally different from those used in the chloroprene rubber production industry, making their process compatibility incompatible. Furthermore, existing synthesis tower control patents generally only address the control logic development for a single synthesis tower, failing to consider multi-tower coordinated production scenarios. Summary of the Invention

[0004] To address the aforementioned technical problems, this application proposes a chloroprene rubber synthesis tower assembly and its control method.

[0005] The technical solution adopted in this application is as follows: a chloroprene rubber synthesis tower group, including a first material tank, a second material tank, a first synthesis tower, a second synthesis tower and a third synthesis tower. The output end of the second material tank is connected to the input end of the analytical tower. The output end of the analytical tower is connected to the input ends of the first synthesis tower, the second synthesis tower and the third synthesis tower through a second material main pipe and a regulating valve, respectively. The output end of the first material tank is connected to the input ends of the first synthesis tower, the second synthesis tower and the third synthesis tower through a regulating valve, respectively. Liquid level sensors are installed in both the first and second material tanks, and a pressure sensor is installed in the second material main pipe to detect the flow rate of the second material in the second material main pipe. Mass flow meters are installed at the input ends of the first, second, and third synthesis towers to detect the flow rate of the second material in the first, second, and third synthesis towers. The control system is electrically connected to the liquid level sensors, pressure sensors, mass flow meters, and regulating valves, respectively.

[0006] Furthermore, it includes the following steps: Step 1: Detect and control the liquid level in the second material tank; specifically including the following steps: Step 1.1: Input the set liquid level of the second material tank into the control system, switch the control system to automatic control mode, and the control system collects the actual liquid level of the second material tank through the liquid level sensor. In each control cycle, the collected data is preprocessed to obtain the deviation between the actual liquid level and the set liquid level of the second material tank and the liquid level change rate of the second material tank. Step 1.2: Enter the threshold value of the deviation between the set liquid level of the second material tank and the threshold value of the liquid level change rate of the second material tank into the operating condition parameter comparison table. Refer to the operating condition parameter comparison table to determine the adjustment amount under the current operating condition based on the deviation between the actual liquid level and the set liquid level of the second material tank and the liquid level change rate of the second material tank. Step 1.3: Based on the adjustment amount under the current operating conditions and combined with the set flow rate of the second material in the previous control cycle, obtain the set flow rate of the second material in the next control cycle; Step 2: The control system determines the operating conditions based on the liquid level in the first material tank and the pressure in the second material main pipe, and adjusts the feed rate of the second material in the analytical tower; specifically, it includes the following steps: Step 2.1: The control system collects the liquid level of the first material tank and the flow rate of the second material in the second material main pipe; when the liquid level of the first material tank is 5% to 20% and the pressure in the second material main pipe is less than 43 kPa, it is determined to be a normal operating condition and proceeds to step 2.3; other situations are determined to be abnormal operating conditions and proceeds to step 2.2. Step 2.2: In each control cycle, the control system will reduce the flow rate of the second material delivered to the analytical tower by 0.1 cubic meters per hour. If the lower limit of the reduction in the flow rate of the second material is greater than 2 cubic meters per hour, return to step 2.1. Step 2.3: The control system calculates the increase or decrease in the flow rate of the first material in the first material tank, the compensation value of the set flow rate of the second material in the second material tank, and the final value of the set flow rate of the second material in the second material tank, and adjusts the feed rate of the second material in the analytical tower according to the final value of the set flow rate of the second material in the second material tank. Step 3: The control system controls the feed rate of the second material in the first, second, and third synthesis towers respectively through regulating valves to balance the operating conditions of the first, second, and third synthesis towers; specifically, it includes the following steps: Step 3.1: Collect the feed rate of the second material in the first synthesis tower, the second synthesis tower, and the third synthesis tower respectively. If the feed rate of the second material in the first synthesis tower, the second synthesis tower, or the third synthesis tower is greater than 0.1 cubic meters / hour, it is determined that the synthesis tower is running and the continuous running time of the synthesis tower is calculated. Step 3.2: Determine the operating conditions of the first, second, or third synthesis tower respectively: If the deviation between the actual flow rate of the second material in the synthesis tower and the set flow rate is greater than 30%, the opening of the regulating valve between the second material tank and the synthesis tower is greater than 95% and the holding time is greater than 10 minutes, and the continuous operating time of the synthesis tower is greater than 8 hours, then the operating condition of the synthesis tower is determined to be abnormal, and step 3.3 is executed; if the above conditions are not met, then the operating condition of the synthesis tower is determined to be normal, and step 3.4 is executed. Step 3.3: The control system reduces the opening of the regulating valve between the synthesis tower with the shortest continuous operating time and the lowest internal resistance and the second material tank, and increases the opening of the regulating valve between the synthesis tower with the longest continuous operating time and the highest internal resistance and the second material tank, thereby balancing the flow rate of the second material entering the two synthesis towers, and returns to step 3.2. Step 3.4: The control system detects the flow rate of the second material in the second material main pipe through a pressure sensor, and controls the opening of the regulating valve between the second material tank and the first, second, or third synthesis tower according to the second material feed rate of a single synthesis tower. The feed rate of the second material to a single synthesis tower = the flow rate of the second material in the main pipe of the second material / the number of synthesis towers; Step 3.5: The control system detects the flow rate of the second material in the second material main pipe through the pressure sensor. If the pressure in the second material main pipe is greater than 43 kPa, the control system controls the opening of the regulating valve between the second material tank and the first synthesis tower, the second synthesis tower or the third synthesis tower to the maximum, thereby reducing the pressure in the second material main pipe. Step 4: Adjust the temperatures inside the first synthesis tower, the second synthesis tower, and the third synthesis tower according to the adjustment amount under the current operating conditions.

[0007] Further, in step 1.1, the deviation E between the actual liquid level and the set liquid level in the second material tank, and the rate of change V of the liquid level in the second material tank are: E = Actual liquid level in the second material tank - Set liquid level in the second material tank; V = Actual liquid level in the second material tank - Actual liquid level in the second material tank 30 seconds ago.

[0008] Furthermore, in step 1.3, the second material set flow rate in the next control cycle = the second material set flow rate in the previous control cycle + the adjustment amount under the current operating conditions.

[0009] Furthermore, in step 2.3, the change in the flow rate of the first material in the first material tank, the compensation value of the set flow rate of the second material in the second material tank, and the final value of the set flow rate of the second material in the second material tank are: Change in the flow rate of the first material in the first material tank = Actual flow rate of the first material in the first material tank - Actual flow rate of the first material in the first material tank 1 minute ago; The compensation value for the set flow rate of the second material in the second material tank = the increase or decrease in the flow rate of the first material in the first material tank × the fixed matching ratio; The final value of the set flow rate of the second material in the second material tank = the compensation value of the set flow rate of the second material in the second material tank + the set flow rate of the second material in the second material tank.

[0010] The advantages of this application over existing technologies are: effectively balancing the production load among the three synthesis towers and reducing the intensity of manual operation; possessing industry uniqueness and technological exclusivity, different from existing single-tower control schemes, focusing on building an overall control architecture for the tower group, designing multi-tower balancing ratio, temperature linkage, and load balancing strategies, filling the gap in multi-tower group balancing control in the industry. Attached Figure Description

[0011] The following description, in conjunction with the accompanying drawings, further illustrates this application: Figure 1 This is a schematic diagram of the chloroprene rubber synthesis tower assembly in this application; Figure 2 This is a flowchart illustrating step 1 of this application; Figure 3 This is a flowchart illustrating step 2 in this application; Figure 4 This is a flowchart illustrating step 3 in this application; Figure 5 This describes the operating logic of the three synthesis towers in this application; Figure 6 This is a schematic diagram of the control method flow of this application; In the diagram: 1 is the first material tank, 2 is the second material tank, 3 is the first synthesis tower, 4 is the second synthesis tower, 5 is the third synthesis tower, 6 is the analytical tower, 7 is the second material main pipe, and 8 is the regulating valve. Detailed Implementation

[0012] like Figures 1 to 6 As shown, this application provides a chloroprene rubber synthesis tower group, including a first material (W1) tank, a second material (W2) tank, a first synthesis tower 3, a second synthesis tower 4, and a third synthesis tower 5. The output end of the second material tank 2 is connected to the input end of the analytical tower 6. The output end of the analytical tower 6 is connected to the input ends of the first synthesis tower 3, the second synthesis tower 4, and the third synthesis tower 5 through a second material main pipe 7 and a regulating valve 8, respectively. The output end of the first material tank 1 is connected to the input ends of the first synthesis tower 3, the second synthesis tower 4, and the third synthesis tower 5 through the regulating valve 8, respectively. Liquid level sensors are installed in both the first material tank 1 and the second material tank 2. A pressure sensor is installed in the second material main pipe 7 to detect the flow rate of the second material in the second material main pipe 7. Mass flow meters are installed at the input ends of the first synthesis tower 3, the second synthesis tower 4, and the third synthesis tower 5 to detect the flow rate of the second material in the first synthesis tower 3, the second synthesis tower 4, and the third synthesis tower 5. The control system is electrically connected to the liquid level sensor, the pressure sensor, the mass flow meter, and the regulating valve 8, respectively.

[0013] A method for controlling the chloroprene rubber synthesis tower assembly as described above includes the following steps: Step 1: Detect and control the liquid level in the second material tank 2; specifically including the following steps: Step 1.1: Input the set liquid level of the second material tank 2 into the control system, switch the control system to automatic control mode, and the control system collects the actual liquid level of the second material tank 2 through the liquid level sensor. The collected data is preprocessed in each control cycle (0.5s) to obtain the deviation between the actual liquid level and the set liquid level of the second material tank 2, and the liquid level change rate of the second material tank 2. The deviation E between the actual liquid level and the set liquid level of the second material tank 2, and the liquid level change rate V of the second material tank 2 are: E = Actual liquid level in the second material tank - Set liquid level in the second material tank; V = Actual liquid level in the second material tank - Actual liquid level in the second material tank 30 seconds ago; Step 1.2: Enter the threshold value of the deviation between the set liquid level of the second material tank 2 and the threshold value of the liquid level change rate of the second material tank 2 into the operating condition parameter comparison table. Based on the deviation between the actual liquid level of the second material tank 2 and the set liquid level, and the liquid level change rate of the second material tank 2, determine the adjustment amount under the current operating condition according to the operating condition parameter comparison table. Step 1.3: Based on the adjustment amount under the current operating conditions and combined with the set flow rate of the second material in the previous control cycle, obtain the set flow rate of the second material in the next control cycle: Set flow rate of the second material in the next control cycle = Set flow rate of the second material in the previous control cycle + Adjustment amount under the current operating conditions; Step 2: The control system determines the operating conditions based on the liquid level in the first material tank 1 and the pressure in the second material main pipe 7, and adjusts the feed rate of the second material in the analytical tower 6; specifically, it includes the following steps: Step 2.1: The control system collects the liquid level of the first material tank 1 and the flow rate of the second material in the second material main pipe 7; when the liquid level of the first material tank 1 is 5% to 20% and the pressure in the second material main pipe 7 is less than 43 kPa, it is determined to be a normal working condition and step 2.3 is executed; other situations are determined to be abnormal working conditions and step 2.2 is executed. Step 2.2: In each control cycle, the control system will reduce the flow rate of the second material delivered to the analytical tower by 0.1 cubic meters per hour. If the lower limit of the reduction in the flow rate of the second material is greater than 2 cubic meters per hour, return to step 2.1. Step 2.3: The control system calculates the change in the flow rate of the first material in the first material tank 1, the compensation value of the set flow rate of the second material in the second material tank 2, and the final value of the set flow rate of the second material in the second material tank 2. Based on the final value of the set flow rate of the second material in the second material tank 2, the system adjusts the feed rate of the second material in the analytical tower 6. The change in the flow rate of the first material in the first material tank 1, the compensation value of the set flow rate of the second material in the second material tank 2, and the final value of the set flow rate of the second material in the second material tank 2 are: Change in the flow rate of the first material in the first material tank = Actual flow rate of the first material in the first material tank - Actual flow rate of the first material in the first material tank 1 minute ago; The compensation value for the set flow rate of the second material in the second material tank = the increase or decrease in the flow rate of the first material in the first material tank × the fixed matching ratio; The final value of the set flow rate of the second material in the second material tank = the compensation value of the set flow rate of the second material in the second material tank + the set flow rate of the second material in the second material tank; The fixed matching ratio is 0.3. Step 3: The control system controls the feed rate of the second material in the first synthesis tower 3, the second synthesis tower 4, and the third synthesis tower 5 respectively through regulating valve 8, thereby balancing the operating conditions of the first synthesis tower 3, the second synthesis tower 4, and the third synthesis tower 5; specifically, it includes the following steps: Step 3.1: Collect the feed rate of the second material in the first synthesis tower 3, the second synthesis tower 4, and the third synthesis tower 5 respectively. If the feed rate of the second material in the first synthesis tower 3, the second synthesis tower 4, or the third synthesis tower 5 is greater than 0.1 cubic meters / hour, it is determined that the synthesis tower is running and the continuous running time of the synthesis tower is calculated. Step 3.2: Determine the operating conditions of the first synthesis tower 3, the second synthesis tower 4, or the third synthesis tower 5 respectively: If the deviation between the actual flow rate of the second material in the synthesis tower and the set flow rate is greater than 30%, the opening degree of the regulating valve 8 between the second material tank 2 and the synthesis tower is greater than 95% and the holding time is greater than 10 minutes, and the continuous operating time of the synthesis tower is greater than 8 hours, then the operating condition of the synthesis tower is determined to be abnormal, and step 3.3 is executed; if the above conditions are not met, then the operating condition of the synthesis tower is determined to be normal, and step 3.4 is executed. Step 3.3: The control system reduces the opening of the regulating valve 8 between the synthesis tower with the shortest continuous operating time and the lowest internal resistance and the second material tank 2, and increases the opening of the regulating valve 8 between the synthesis tower with the longest continuous operating time and the highest internal resistance and the second material tank 2, thereby balancing the flow rate of the second material entering the two synthesis towers, and returns to step 3.2. Step 3.4: The control system detects the flow rate of the second material in the second material main pipe 7 through a pressure sensor, and controls the opening of the regulating valve 8 between the second material tank 2 and the first synthesis tower 3, the second synthesis tower 4, or the third synthesis tower 5 according to the second material feed rate of a single synthesis tower: The feed rate of the second material to a single synthesis tower = the flow rate of the second material in the second material header 7 / the number of synthesis towers; Step 3.5: The control system detects the flow rate of the second material in the second material main pipe 7 through the pressure sensor. If the pressure in the second material main pipe 7 is greater than 43 kPa, the control system controls the opening of the regulating valve 8 between the second material tank 2 and the first synthesis tower 3, the second synthesis tower 4 or the third synthesis tower 5 to the maximum, thereby reducing the pressure in the second material main pipe 7. Step 4: Adjust the temperatures in the first synthesis tower 3, the second synthesis tower 4, and the third synthesis tower 5 according to the adjustment amount under the current operating conditions.

[0014] In the embodiments of this application, the threshold values ​​for the deviation between the set liquid levels of the second material tank 2 in step 1.2 include: E1=-1.0, E2=-0.5, E3=0.5, E4=1.0; the threshold values ​​for the rate of change of liquid level in the second material tank 2 include: V1=-0.1, V2=-0.05, V3=0.05, V4=0.1; the adjustment amounts under the current operating conditions include: DMV1_1: -1.5, DMV1_2: -1.5, DMV1_3: -1.0, DMV1_4: -1.5, DMV1_5: -1.5, DMV2_1: -1.5, DMV2_ 2: -0.5, DMV2_3: -0.5, DMV2_4: -1, DMV2_5: -1.5, DMV3_1: -0.5, DMV3_2: 0, DMV3_3: 0, DMV3_4: 0, DMV3_5: 0.5, DMV4_1: 0.5, DMV4_2: -0.5, DMV4_3: 0.5, DMV4_4: 1, DMV4_5: 1.5, DMV5_1: 1, DMV5_2: 0.5, DMV5_3: 1, DMV5_4: 1.5, DMV5_5: 1.5; Specific operating parameters are shown in Table 1.

[0015] Table 1. Comparison of Operating Condition Parameters.

[0016] .

[0017] During continuous production, chemical reactions occur continuously within the synthesis towers, generating side reactions. Impurities from these side reactions gradually deposit on the packing and reaction components, narrowing the flow channels and causing the operating resistance of each tower to gradually increase over time. This increasing resistance inhibits media transport, leading to a slow decrease in the feed rate of the second material in all three synthesis towers. Furthermore, the rate of resistance increase varies across towers, easily causing imbalances in the production load of individual towers. Therefore, step 3 in the production process requires coordinated control of the feed rate of the second material in the three synthesis towers, dynamically adjusting the feed rate to evenly distribute the production load. This balances the operating conditions of the three synthesis towers, preventing excessive load or uneven operation in any single tower, and ensuring the long-term stable and smooth operation of the entire synthesis system.

[0018] In step 4, mathematical modeling analysis is conducted on the mechanism by which the first and second materials affect the internal temperature of the synthesis tower. Based on actual production characteristics, the MPC model predictive control algorithm is selected to optimize temperature control. The modeling process fully considers the weights of the first and second materials' effects on the internal temperature of the synthesis tower, their response lag times, and mutual coupling interference. A dynamic mathematical model of the relationship between the flow rates of the first and second materials and the internal temperature of the synthesis tower is identified using historical operating data. The MPC algorithm can collect key parameters such as the current feed rates of the first and second materials, the internal temperature of the synthesis tower, and the reaction pressure in real time, predicting the temperature change trend of the synthesis tower over a future period. Within the constraints, continuous rolling optimization is performed to find the optimal feed adjustment rates of the first and second materials, suppressing tower temperature fluctuations in advance. The technologies involved in step 4 are all existing technologies. Specific references are as follows: 1. Foreign textbook: Model Predictive Control: Theory, Computation, and Design, authors: James B. Rawlings, David Q. Mayne, Moritz M. Diehl, publisher: Nob Hill Publishing (2nd edition 2024, first edition 2009); 2. Domestic textbook: Introduction to Engineering Applications of Model Predictive Control, authors: Zou Tao, Ding Baocang, Zhang Duan, publisher: Chemical Industry Press (2010). Example

[0019] The chloroprene rubber synthesis tower unit of a certain factory adopted the core control system and control scheme of this invention. The project uses the Supcon ECS-700 control system, on which a pair of redundant general-purpose controllers are added. The control scheme is implemented on the general-purpose controllers through FBD graphical programming and script programming.

[0020] The typical process for implementing this type of project includes: on-site investigation and survey, detailed scheme design, scheme configuration and programming, program debugging and deployment.

[0021] 1. On-site investigation and survey In the early stages of the project, a comprehensive and detailed on-site survey and investigation were conducted. Technical personnel went deep into the production unit to thoroughly investigate and verify the entire production process, equipment operating status, instrument installation layout, and the operation of the existing control system. Simultaneously, they proactively conducted face-to-face interviews with on-site operators, process engineers, and instrument maintenance personnel to fully understand the unit's daily production challenges, common fluctuations, and pain points in manual operation. By retrieving long-term historical operating curves, production ledgers, and fault alarm records, the patterns of process parameter changes were summarized and analyzed. Combined with the actual on-site hardware conditions, a comprehensive assessment of the technical difficulty, construction conditions, and economic benefits of the automation upgrade was made, scientifically completing the preliminary feasibility assessment of the project.

[0022] 2. Detailed scheme design Based on the completion of on-site surveys and investigations to identify existing shortcomings, a professional and customized detailed renovation plan was designed. Combining production process control requirements and equipment automation upgrade standards, reasonable suggestions for hardware rectification, optimization, and control optimization were proposed to address weaknesses in the field that do not meet automation requirements, such as outdated instruments, missing measuring points, simple control logic, and cumbersome manual operation.

[0023] 3. Scheme configuration and programming Strictly following the finalized detailed design scheme, configuration and control program writing were carried out on the general-purpose controller to realize the development of multi-tower balanced control logic. Simultaneously, auxiliary programs such as communication verification, bumpless handover, and alarm linkage were added to the control system to ensure reliable data exchange between systems and a smooth and safe control process.

[0024] 4. Program debugging and deployment To ensure the stable and reliable operation of the control system, rigorous phased debugging was conducted before its official launch. First, offline simulation debugging was performed, simulating various production conditions to comprehensively verify the program logic, interlocking protection, control loops, and interactive functions. Program vulnerabilities were identified and logical defects corrected to ensure accurate program operation. After successful simulation debugging, on-site material-driven linkage debugging was carried out, monitoring parameter changes in real time along with the actual production process. PID control parameters were continuously optimized and tuned to improve response speed. Under stable operating conditions, the program was gradually and seamlessly switched online, ultimately achieving stable automated operation of the unit.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A chloroprene rubber synthesis tower assembly, characterized in that: It includes a first material tank (1), a second material tank (2), a first synthesis tower (3), a second synthesis tower (4), and a third synthesis tower (5). The output end of the second material tank (2) is connected to the input end of the analytical tower (6). The output end of the analytical tower (6) is connected to the input ends of the first synthesis tower (3), the second synthesis tower (4), and the third synthesis tower (5) through the second material main pipe (7) and the regulating valve (8), respectively. The output end of the first material tank (1) is connected to the input ends of the first synthesis tower (3), the second synthesis tower (4), and the third synthesis tower (5) through the regulating valve (8), respectively. Liquid level sensors are installed in both the first material tank (1) and the second material tank (2). A pressure sensor is installed in the second material main pipe (7) to detect the flow rate of the second material in the second material main pipe (7). Mass flow meters are installed in the input ends of the first synthesis tower (3), the second synthesis tower (4) and the third synthesis tower (5) to detect the flow rate of the second material in the first synthesis tower (3), the second synthesis tower (4) and the third synthesis tower (5). The control system is electrically connected to the liquid level sensor, the pressure sensor, the mass flow meter and the regulating valve (8) respectively.

2. A method for controlling the chloroprene rubber synthesis tower group as described in claim 1, characterized in that, Includes the following steps: Step 1: Detect and control the liquid level in the second material tank (2); specifically including the following steps: Step 1.1: Input the set liquid level of the second material tank (2) into the control system, switch the control system to automatic control mode, and the control system collects the actual liquid level of the second material tank (2) through the liquid level sensor. In each control cycle, the collected data is preprocessed to obtain the deviation between the actual liquid level and the set liquid level of the second material tank (2) and the liquid level change rate of the second material tank (2). Step 1.2: Enter the threshold of the deviation between the set liquid level of the second material tank (2) and the threshold of the liquid level change rate of the second material tank (2) into the working condition parameter comparison table. Based on the deviation between the actual liquid level of the second material tank (2) and the set liquid level, and the liquid level change rate of the second material tank (2), determine the adjustment amount under the current operating condition according to the working condition parameter comparison table. Step 1.3: Based on the adjustment amount under the current operating conditions and combined with the set flow rate of the second material in the previous control cycle, obtain the set flow rate of the second material in the next control cycle; Step 2: The control system determines the operating conditions based on the liquid level of the first material tank (1) and the pressure of the second material main pipe (7), and adjusts the feed rate of the second material in the analysis tower (6); specifically, it includes the following steps: Step 2.1: The control system collects the liquid level of the first material tank (1) and the flow rate of the second material in the second material main pipe (7); when the liquid level of the first material tank (1) is 5% to 20% and the pressure in the second material main pipe (7) is less than 43 kPa, it is determined to be a normal working condition and step 2.3 is executed; other situations are determined to be abnormal working conditions and step 2.2 is executed. Step 2.2: In each control cycle, the control system will reduce the flow rate of the second material delivered to the analytical tower by 0.1 cubic meters per hour. If the lower limit of the reduction in the flow rate of the second material is greater than 2 cubic meters per hour, return to step 2.

1. Step 2.3: The control system calculates the change in the flow rate of the first material in the first material tank (1), the compensation value of the set flow rate of the second material in the second material tank (2), and the final value of the set flow rate of the second material in the second material tank (2), and adjusts the feed rate of the second material in the analytical tower (6) according to the final value of the set flow rate of the second material in the second material tank (2). Step 3: The control system controls the feed rate of the second material in the first synthesis tower (3), the second synthesis tower (4), and the third synthesis tower (5) respectively through regulating valve (8), so as to balance the operating conditions of the first synthesis tower (3), the second synthesis tower (4), and the third synthesis tower (5); specifically including the following steps: Step 3.1: Collect the feed rate of the second material in the first synthesis tower (3), the second synthesis tower (4), and the third synthesis tower (5) respectively. If the feed rate of the second material in the first synthesis tower (3), the second synthesis tower (4), or the third synthesis tower (5) is greater than 0.1 cubic meters / hour, it is determined that the synthesis tower is running and the continuous running time of the synthesis tower is calculated. Step 3.2: Judge the operating conditions of the first synthesis tower (3), the second synthesis tower (4), or the third synthesis tower (5) respectively: If the deviation between the actual flow rate of the second material in the synthesis tower and the set flow rate is greater than 30%, the opening degree of the regulating valve (8) between the second material tank (2) and the synthesis tower is greater than 95% and the holding time is greater than 10 minutes, and the continuous operating time of the synthesis tower is greater than 8 hours, then the operating condition of the synthesis tower is determined to be abnormal, and step 3.3 is executed; if the above conditions are not met, then the operating condition of the synthesis tower is determined to be normal, and step 3.4 is executed. Step 3.3: The control system reduces the opening of the regulating valve (8) between the synthesis tower with the shortest continuous running time and the lowest internal resistance and the second material tank (2), and increases the opening of the regulating valve (8) between the synthesis tower with the longest continuous running time and the highest internal resistance and the second material tank (2), thereby balancing the flow rate of the second material entering the two synthesis towers, and returns to step 3.

2. Step 3.4: The control system detects the flow rate of the second material in the second material main pipe (7) through a pressure sensor, and controls the opening degree of the regulating valve (8) between the second material tank (2) and the first synthesis tower (3), the second synthesis tower (4), or the third synthesis tower (5) according to the second material feed rate of a single synthesis tower: The feed rate of the second material in a single synthesis tower = the flow rate of the second material in the second material main pipe (7) / the number of synthesis towers; Step 3.5: The control system detects the flow rate of the second material in the second material main pipe (7) through the pressure sensor. If the pressure in the second material main pipe (7) is greater than 43 kPa, the control system controls the opening of the regulating valve (8) between the second material tank (2) and the first synthesis tower (3), the second synthesis tower (4) or the third synthesis tower (5) to the maximum, thereby reducing the pressure in the second material main pipe (7). Step 4: Adjust the temperature inside the first synthesis tower (3), the second synthesis tower (4), and the third synthesis tower (5) according to the adjustment amount under the current operating conditions.

3. The control method for a chloroprene rubber synthesis tower group according to claim 2, characterized in that, In step 1.1, the deviation E between the actual liquid level and the set liquid level of the second material tank (2) and the rate of change V of the liquid level of the second material tank (2) are: E = Actual liquid level in the second material tank - Set liquid level in the second material tank; V = Actual liquid level in the second material tank - Actual liquid level in the second material tank 30 seconds ago.

4. The control method for a chloroprene rubber synthesis tower group according to claim 5, characterized in that: In step 1.3, the set flow rate of the second material in the next control cycle = the set flow rate of the second material in the previous control cycle + the adjustment amount under the current operating conditions.

5. The control method for a chloroprene rubber synthesis tower group according to claim 4, characterized in that, In step 2.3, the change in the flow rate of the first material in the first material tank (1), the compensation value of the set flow rate of the second material in the second material tank (2), and the final value of the set flow rate of the second material in the second material tank (2) are: Change in the flow rate of the first material in the first material tank = Actual flow rate of the first material in the first material tank - Actual flow rate of the first material in the first material tank 1 minute ago; The compensation value for the set flow rate of the second material in the second material tank = the increase or decrease in the flow rate of the first material in the first material tank × the fixed matching ratio; The final value of the set flow rate of the second material in the second material tank = the compensation value of the set flow rate of the second material in the second material tank + the set flow rate of the second material in the second material tank.

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