An acid bath plasticizing tank and a control system thereof

Abstract

The application discloses an acid bath plasticizing tank and a control system thereof, and belongs to the technical field of acid bath plasticizing tanks. The control system comprises a data collection unit, a data processing center and an execution control unit. The data collection unit collects the temperature, concentration, liquid level and heating system input power of the sulfuric acid solution in the tank body in real time. The data processing center comprises a storage processing module, an analysis and prediction module and an adjustment and verification module, predicts the temperature change trend of the solution through a long short-term memory (LSTM) model, dynamically calculates the concentration adjustment value based on a solubility temperature function, and introduces an evaporation effect to compensate and optimize the liquid level change, so that the concentration and liquid level are accurately balanced and adjusted. The execution control unit executes the final concentration adjustment instruction and continuously monitors the state in the tank, and alarms in the case that the solution temperature, concentration or liquid level exceeds the safety threshold.

Description

An acid bath plasticizing tank and its control system Technical Field

[0001] This invention relates to the field of acid bath plasticizing tank technology, and more specifically, to an acid bath plasticizing tank and its control system. Background Technology

[0002] In the development of the chemical fiber industry, various new fiber products are emerging. In the production of viscose staple fiber, the acid station must deliver a qualified acid bath to the acid bath tank of the spinning machine to ensure its normal operation. Acid bath treatment is a crucial process in spinning; fibers entering the spinning machine must first undergo acid bath treatment. The quality of the acid bath directly affects the quality of the finished product. Unstable liquid levels can lead to production instability, affecting production efficiency and product quality. Excessively high liquid levels can damage the tank structure, while excessively low liquid levels can cause overheating and damage to the heating elements. Therefore, in existing technologies, liquid level prediction does not consider the influence of temperature. Temperature changes cause changes in liquid volume, thus affecting the liquid level. Failure to consider temperature can lead to excessively high liquid levels causing overflow, or excessively low liquid levels failing to meet production needs. Therefore, this paper proposes an acid bath plasticizing tank and its control system. Summary of the Invention

[0003] The purpose of this invention is to provide an acid bath plasticizing tank and its control system to solve the problems mentioned in the background art, such as the prediction of liquid level not taking into account the influence of temperature, resulting in excessively high liquid level and overflow, or excessively low liquid level and inability to meet production needs.

[0004] To achieve the above objectives, the present invention aims to provide an acid bath plasticizing tank and its control system, comprising:

[0005] Data collection unit: used to collect real-time data related to the sulfuric acid solution in the tank, including the physical state parameters of the sulfuric acid solution, the concentration data of the sulfuric acid solution, the liquid level data of the sulfuric acid solution in the tank, and the input power of the sulfuric acid solution heating system.

[0006] Data Processing Center: Used to obtain the temperature change trend of sulfuric acid solution based on the collected real-time data related to sulfuric acid solution, adjust the concentration of sulfuric acid solution according to the temperature change trend, balance the concentration and liquid level, and optimize the relationship between temperature and liquid level.

[0007] The data processing center includes a storage and processing module, an analysis and prediction module, and an adjustment and verification module.

[0008] Execution control unit: Used to update the concentration adjustment value of sulfuric acid solution in the tank and continuously monitor the situation inside the tank. If any abnormality occurs, an alarm will be triggered.

[0009] As a further improvement to this technical solution, the data processing center also includes a controller, in which the algorithm model and main operation logic of the analysis and prediction module are executed, and the controller is capable of verifying the input parameters.

[0010] As a further improvement to this technical solution, in the data processing center, the storage processing module is used to store the collected real-time data related to sulfuric acid solution and the historical data related to sulfuric acid solution, and to preprocess the real-time data.

[0011] The analysis and prediction module is used to predict the temperature change trend of sulfuric acid solution based on the data of the storage and processing module, obtain the sulfuric acid solution concentration adjustment value based on the temperature change trend, and adjust the balance between concentration and sulfuric acid solution level based on the concentration adjustment value. If the predicted liquid level is within an acceptable range, the concentration adjustment value is transmitted to the adjustment verification module. Based on the feedback from the adjustment verification module, the analysis and prediction module will re-evaluate the concentration adjustment strategy.

[0012] The adjustment and verification module is used to adjust the parameters in the controller based on the concentration value transmitted by the analysis and prediction module, continuously monitor the liquid level value in the controller, and determine whether the liquid level exceeds the preset safety threshold. If the liquid level value does not exceed the preset safety threshold, the concentration adjustment value is transmitted to the execution control unit; otherwise, the judgment result is fed back to the analysis and prediction module.

[0013] As a further improvement to this technical solution, the analysis and prediction module, which predicts the temperature change trend of the sulfuric acid solution based on data from the storage and processing module, is as follows:

[0014] S1. Extract key features from the data in the storage and processing module, and standardize the key features to the same scale; among them, the key features include the sliding window average of the time series data. Rate of change of temperature Input power of the heating system ;

[0015] S2. Construct the LSTM model:

[0016] Internal state of the LSTM cell:

[0017] ;

[0018] in, This represents the cell state at the current time step. The output of the forget gate; This represents the cell state at the previous time step; The output of the input gate; Candidate cell state; This represents element-wise multiplication;

[0019] Output of the LSTM unit:

[0020] ;

[0021] in, The hidden state at the current time step; This is the output of the output gate; It is the hyperbolic tangent function;

[0022] ;

[0023] ;

[0024] ;

[0025] in, Use the Sigmoid activation function; Here is the weight matrix for the forget gate; This is the hidden state from the previous time step; The input feature vector; ; For the bias term of the forget gate; Here is the weight matrix of the input gate; This is the bias term for the input gate; This is the weight matrix of the output gate; This is the bias term for the output gate;

[0026] ;

[0027] in, This is the weight matrix for the candidate units; Bias terms for candidate cells;

[0028] ;

[0029] in, For the predicted sulfuric acid solution in time Temperature value at any given time; This is the weight matrix from the hidden state to the output layer; This is the bias term for the output layer.

[0030] As a further improvement to this technical solution, the analysis and prediction module involves obtaining the sulfuric acid solution concentration adjustment value based on the temperature change trend, as detailed below:

[0031] ;

[0032] in, For sulfuric acid solution at temperature Solubility at that time; For sulfuric acid solution at the reference temperature Solubility at [specific value]; Temperature coefficient; This is the current temperature of the sulfuric acid solution; The reference temperature is the temperature of the sulfuric acid solution; the change in solution volume due to the addition of solute is negligible.

[0033] ;

[0034] in, For sulfuric acid solution at the reference temperature Below, at concentration The calculated theoretical mass of solute; This represents the target concentration that the sulfuric acid solution needs to maintain. The volume of the reference solution;

[0035] ;

[0036] in, To be at temperature Below is the target mass of the solute in the sulfuric acid solution after adjustment based on the solubility ratio;

[0037] ;

[0038] in, This is the recommended change in solute mass;

[0039] if If the target solute mass should be increased, then solute needs to be added to the sulfuric acid solution; if If the target solute mass should be relatively reduced, then a diluent needs to be added to the sulfuric acid solution.

[0040] This results in the final mass of the solute It meets the set concentration requirements.

[0041] As a further improvement to this technical solution, the balance between the concentration and the sulfuric acid solution level adjusted according to the concentration adjustment value in the analysis and prediction module is as follows:

[0042] ;

[0043] in, To increase or decrease the change in volume of sulfuric acid solution after adjusting the substances; The actual mass of solute or diluent added; The density of the added solute or diluent;

[0044] ;

[0045] in, The height of the sulfuric acid solution increased or decreased; The area of ​​the base of the cuboid above the tank;

[0046] ;

[0047] in, This refers to the liquid level of the sulfuric acid solution. This represents the initial height of the sulfuric acid solution.

[0048] if Therefore, reduce the volume of sulfuric acid solution in the tank before adjusting the concentration. The maximum safe liquid level in the container;

[0049] ;

[0050] in, This represents the volume of sulfuric acid solution that needs to be reduced.

[0051] As a further improvement to this technical solution, the relationship between temperature and liquid level is introduced for optimization when adjusting the balance between the concentration and the liquid level, specifically:

[0052] ;

[0053] in, This represents the evaporation rate of the sulfuric acid solution. It is a proportionality constant; To be at temperature The saturated vapor pressure below; This is the actual vapor pressure;

[0054] ;

[0055] in, This represents the volume of sulfuric acid solution that evaporates per unit time. For time intervals; The density of the sulfuric acid solution;

[0056] but:

[0057] ;

[0058] in, The height by which the sulfuric acid solution decreases due to temperature;

[0059] ;

[0060] in, The optimized liquid level value;

[0061] if If so, reduce the volume of sulfuric acid solution in the tank before adjusting the concentration.

[0062] As a further improvement to this technical solution, the abnormal conditions in the execution control unit include the sulfuric acid solution temperature exceeding its safety threshold, the sulfuric acid solution level exceeding its safety threshold, and the sulfuric acid solution concentration exceeding its safety threshold. An alarm will be triggered if any one of these conditions occurs.

[0063] An acid bath plasticizing tank is provided, comprising a tank body. A temperature sensor, a concentration sensor, and a level sensor are installed on the inner wall of the tank body. The temperature sensor detects the temperature of the sulfuric acid solution, the concentration sensor detects the concentration of the sulfuric acid solution, and the level sensor monitors the level of the sulfuric acid solution. A steam pipe is located near the bottom of the tank body and is connected to a sulfuric acid solution heating system. The sulfuric acid solution heating system regulates the temperature of the steam pipe to control the temperature of the sulfuric acid solution. A drain pipe is connected to the bottom of the tank body. When it is necessary to reduce the volume of the sulfuric acid solution, the sulfuric acid solution is discharged from the drain pipe. A control valve is located above the drain pipe.

[0064] As a further improvement to this technical solution, a transparent cover is hinged to one side of the tank, a handle is fixedly installed on the outer surface of the transparent cover, a number of wire pressing parts are fixedly installed on the inner surface of the transparent cover, and wire guide ports are fixedly installed on both sides of the inner surface of the transparent cover. A number of flexible tubes are opened through the tank, and the flexible tubes are used to discharge the vapor of sulfuric acid solution. The flexible tubes and the wire pressing parts are evenly distributed.

[0065] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0066] In this acid bath plasticizing tank and its control system, by considering the influence of the temperature of the sulfuric acid solution on the volume of the sulfuric acid solution, the change of the sulfuric acid solution level can be predicted more accurately, thereby avoiding accidental overflow or insufficient situation. Through precise control of the sulfuric acid solution level, the risk of tank damage can be reduced, thereby reducing maintenance costs. The system can better adapt to changes in ambient temperature, improving its adaptability under different environmental conditions. Attached Figure Description

[0067] Figure 1 is an overall flowchart of the present invention;

[0068] Figure 2 is a schematic diagram of the overall structure of the present invention.

[0069] The meanings of the labels in the diagram are as follows:

[0070] 1. Tank body; 2. Transparent cover; 21. Flexible hose; 22. Wire pressing component; 23. Wire guide port; 24. Handle; 3. Steam pipe; 4. Drain pipe; 41. Control valve;

[0071] 10. Data collection unit; 20. Data processing center; 201. Storage and processing module; 202. Analysis and prediction module; 203. Adjustment and verification module; 204. Controller; 30. Execution control unit. Detailed Implementation

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] Please refer to Figure 2. An acid bath plasticizing tank is provided, including a tank body 1. A temperature sensor, a concentration sensor, and a liquid level sensor are installed on the inner wall of the tank body 1. The temperature sensor is used to detect the temperature data of the sulfuric acid solution, the concentration sensor is used to detect the concentration data of the sulfuric acid solution, and the liquid level sensor is used to monitor the liquid level data of the sulfuric acid solution. A steam pipe 3 is provided near the bottom inside the tank body 1. The steam pipe 3 is connected to a sulfuric acid solution heating system. The sulfuric acid solution heating system regulates the temperature of the steam pipe 3, thereby controlling the temperature of the sulfuric acid solution. It can effectively heat the sulfuric acid solution and ensure the temperature conditions required by the sulfuric acid solution in the plasticizing process. The heating system supplies power to the steam pipe to ensure a stable and controllable heat supply. The steam pipe 3 is detachable, which is convenient for maintenance, cleaning, or replacement of damaged parts, reducing downtime and maintenance costs. A drain pipe 4 is connected to the bottom of the tank body 1. When it is necessary to reduce the volume of the sulfuric acid solution, the sulfuric acid solution is discharged from the drain pipe 4. A control valve 41 is provided above the drain pipe 4. By controlling the valve to adjust the flow rate, it helps to accurately control the discharge speed and amount, avoiding unnecessary waste or overflow.

[0074] A transparent cover 2 is hinged to one side of the tank 1. The cover, made of transparent material, allows the operator to observe the situation inside the tank 1 at any time, such as the state of the sulfuric acid solution and the direction of the fibers. A handle 24 is fixedly installed on the outer surface of the transparent cover 2, and several wire pressing parts 22 are fixedly installed on the inner surface of the transparent cover 2. The wire pressing parts 22 can press the guide wire into the acid solution. In this embodiment, the wire pressing parts 22 can be set in an arc shape or a U shape, and guide wire openings 23 are fixedly installed on both sides of the inner surface of the transparent cover 2 to guide the fibers or yarns through the acid bath, ensuring that they are evenly contacted with the sulfuric acid solution, thereby improving the processing quality and efficiency. Several flexible hoses 21 are opened through the tank 1. These flexible hoses 21 are channels for introducing or discharging sulfuric acid solution vapor or liquid, which helps to maintain a stable working environment inside the tank 1 and ensures that the fibers or yarns pass through smoothly. The flexible hoses 21 and the wire pressing parts 22 are evenly distributed.

[0075] It should be noted that both the transparent cover 2 and the top surface of the tank 1 are equipped with sealing rubber rings. When the transparent cover 2 and the tank 1 are closed, the sealing rubber rings are in close contact with each other, achieving a good sealing effect.

[0076] Please refer to Figure 1. A control system for an acid bath plasticizing tank is provided. The method mainly involves adjusting the concentration in advance by predicting temperature changes, balancing the relationship between the concentration and the liquid level when adjusting the concentration, and optimizing the relationship between temperature and liquid level when balancing the concentration and liquid level to ensure the stability and efficiency of the production process. The system includes a data collection unit 10, a data processing center 20, and an execution control unit 30.

[0077] The data collection unit 10 is used to collect real-time data related to the sulfuric acid solution in the tank 1. The real-time data includes the physical state parameters of the sulfuric acid solution, the concentration data of the sulfuric acid solution, the liquid level data of the sulfuric acid solution in the tank 1, and the input power of the sulfuric acid solution heating system.

[0078] The data processing center 20 is used to obtain the temperature change trend of the sulfuric acid solution based on the collected real-time data related to the sulfuric acid solution, adjust the concentration of the sulfuric acid solution according to the temperature change trend, and balance the concentration and liquid level. At the same time, the relationship between temperature and liquid level is introduced for optimization. The data processing center 20 includes a storage and processing module 201, an analysis and prediction module 202, and an adjustment and verification module 203.

[0079] The data processing center 20 is equipped with a controller 204. The algorithm model and main operation logic of the analysis and prediction module 202 are executed in the controller 204. The controller 204 can verify the input parameters.

[0080] In the data processing center 20, the storage processing module 201 is used to store the collected real-time data related to sulfuric acid solution and the historical data related to sulfuric acid solution, and to preprocess the real-time data.

[0081] The analysis and prediction module 202 is used to predict the temperature change trend of the sulfuric acid solution based on the data from the storage and processing module 201, obtain the sulfuric acid solution concentration adjustment value based on the temperature change trend, and adjust the balance between the concentration and the sulfuric acid solution level based on the concentration adjustment value. If the predicted level is within an acceptable range, the concentration adjustment value is transmitted to the adjustment verification module 203. Based on the feedback from the adjustment verification module 203 (e.g., if the feedback indicates that the level may exceed the limit), the analysis and prediction module will re-evaluate the concentration adjustment strategy, including adjusting in batches, discharging part of the solution before adjustment, or fine-tuning the concentration target value within the allowable process range, to ensure the safety of the level. It can predict future temperature change trends, provide a basis for adjusting the concentration, and automatically adjust the concentration and level based on the prediction results, reducing the need for manual intervention. By optimizing the balance between concentration and level, it improves production efficiency and quality.

[0082] The analysis and prediction module 202, based on the data from the storage and processing module 201, predicts the temperature change trend, as detailed below:

[0083] S1. Extract key features from the data in storage processing module 201 and standardize the key features to the same scale; wherein, the key features include the sliding window average of the time series data. Rate of change of temperature Input power of the heating system ;

[0084] S2. Construct the LSTM model:

[0085] The input dimension of the input layer is equal to the number of features. For example, if there are three features (sliding window average, temperature change rate, and heating system input power change), the input dimension is 3. The LSTM layer is used to capture long-term dependencies in time series data. The output dimension of the LSTM layer can be adjusted as needed. Usually, a smaller value can be chosen to reduce the complexity of the model. The output layer has only one node, which is used to predict the temperature value at the next time step.

[0086] Internal state of the LSTM cell:

[0087] ;

[0088] in, This represents the cell state at the current time step. The output of the forget gate; This represents the cell state at the previous time step; The output of the input gate; Candidate cell state; This represents element-wise multiplication;

[0089] Output of the LSTM unit:

[0090] ;

[0091] in, The hidden state at the current time step; This is the output of the output gate; It is the hyperbolic tangent function, used in neural networks to introduce nonlinear characteristics;

[0092] It is by checking the cell state at the current time step. After passing through the tanh function, and then interacting with the output of the output gate... It is obtained through element-wise multiplication ∘. The tanh function here is used to represent the unit state. Mapped to Within the interval, the output of the output gate is then used to determine which information should be passed to the next time step;

[0093] ;

[0094] ;

[0095] ;

[0096] in, Use the Sigmoid activation function; Here is the weight matrix for the forget gate; This is the hidden state from the previous time step; The input feature vector; ; For the bias term of the forget gate; Here is the weight matrix of the input gate; This is the bias term for the input gate; This is the weight matrix of the output gate; This is the bias term for the output gate;

[0097] ;

[0098] in, This is the weight matrix for the candidate units; Bias terms for candidate cells;

[0099] This is achieved by hiding the state from the previous time step. and the input features at the current time step Through a linear transformation and bias terms After that, and then Obtained by the function. The function here maps the result of a linear transformation to... Within the interval, thus generating candidate unit states;

[0100] ;

[0101] in, For the predicted sulfuric acid solution in time Temperature value at any given time; This is the weight matrix from the hidden state to the output layer; This is the bias term for the output layer.

[0102] The concentration adjustment value obtained based on the temperature change trend in the analysis and prediction module 202 is as follows:

[0103] Temperature affects the solubility of a solute. Some substances have increased solubility with increasing temperature, while others have decreased solubility. Therefore, changes in temperature may affect the maximum soluble concentration of a sulfuric acid solution, especially when the set working concentration is... When the solubility approaches saturation, the amount of raw material added needs to be adjusted to compensate for this change in order to maintain the working concentration or prevent precipitation. For sulfuric acid solutions in plasticizing tanks, if temperature changes affect the solubility of the solute, then the amount of raw material added needs to be adjusted to compensate for this change. Assuming that the solubility of the sulfuric acid solution in this embodiment increases with increasing temperature;

[0104] ;

[0105] in, For sulfuric acid solution at temperature Solubility at that time; For sulfuric acid solution at the reference temperature Solubility at [specific value]; This is a temperature coefficient; a positive value is taken for cases where solubility increases with increasing temperature, and a negative value is taken otherwise. This is the current temperature of the sulfuric acid solution; The reference temperature for the sulfuric acid solution;

[0106] In this embodiment, the solvent volume at the initial analysis If the relative concentration remains constant, then the concentration of the solute in the sulfuric acid solution... It can be expressed as the mass of the solute. Divide by solvent volume .

[0107] To maintain the concentration of solute in sulfuric acid solution At a certain set point Therefore, the mass of the solute needs to be adjusted according to the temperature change. Specifically, when temperature changes affect solubility... When changes occur, in order to maintain the concentration as much as possible while taking into account the effect of solubility. Unchanging Approach The amount of solute added needs to be adjusted. .

[0108] ;

[0109] in, For sulfuric acid solution at the reference temperature Below, at concentration The calculated theoretical mass of solute; This represents the target concentration that the sulfuric acid solution needs to maintain. To determine the volume of the reference solution and considering the change in solubility with temperature, calculate an adjusted target solute mass. ,as follows;

[0110] ;

[0111] in, To be at temperature The following describes the target mass of solute in a sulfuric acid solution after adjusting the solubility ratio. The aim is to adjust the solute content proportionally based on solubility changes when the actual operating concentration approaches saturation, in order to maintain a concentration with a relatively similar degree of saturation under new temperature conditions. In other words, if... This itself represents in At a certain saturation ratio, Maintain the same saturation ratio at the same temperature. To maintain the solution concentration at the target temperature-dependent state, the amount of solute added needs to be adjusted according to temperature changes. ;

[0112] ;

[0113] in, This is the suggested change in solute mass;

[0114] if If the target solute mass should be increased, then solute (or concentrated sulfuric acid) needs to be added to the sulfuric acid solution; if If the target solute mass should be relatively reduced (or the relative concentration needs to be lowered), then a diluent (such as water) needs to be added to the sulfuric acid solution.

[0115] This results in the final mass of the solute The desired concentration is achieved, meaning the adjusted solution concentration meets the requirements. (in The total volume of the adjusted solution should be as close as possible to the required value. Or according to Adjusted target concentration.

[0116] Furthermore, the analysis and prediction module 202 involves adjusting the balance between concentration and liquid level based on the concentration adjustment value. This is because adding solute and diluent to the sulfuric acid solution will increase the volume of the sulfuric acid solution, and as the volume of the sulfuric acid solution increases, the liquid level will also increase, as detailed below:

[0117]

[0118] in, To increase or decrease the change in volume of sulfuric acid solution after adjusting the substance (solute or diluent); The mass of the actual solute or diluent added (its value is based on the aforementioned) (Calculation results and determination based on the selected materials) The density of the added solute or diluent;

[0119] ;

[0120] in, The height of the sulfuric acid solution increased or decreased; This refers to the base area of ​​the cuboid above tank 1; in this embodiment, the addition and reduction of sulfuric acid solution are both carried out within the cuboid above tank 1.

[0121] ;

[0122] in, This refers to the liquid level of the sulfuric acid solution. This represents the initial height of the sulfuric acid solution.

[0123] if , To determine the maximum safe sulfuric acid solution height in the container, reduce the volume of sulfuric acid solution in tank (1) before adjusting the concentration.

[0124] ;

[0125] in, The volume of sulfuric acid solution to be reduced is required; the sulfuric acid solution to be reduced is discharged through drain pipe 4.

[0126] Since increased temperature increases the evaporation rate of sulfuric acid solution, especially in open systems, this can lead to a drop in the sulfuric acid solution level. To compensate for evaporation losses, the replenishment rate needs to be increased to maintain a stable level. Therefore, the relationship between temperature and level is introduced for optimization when adjusting the balance between concentration and level. Specifically:

[0127] ;

[0128] in, The evaporation rate of the sulfuric acid solution (defined here as the mass evaporation rate per unit area). ); It is a proportionality constant, which depends on the properties of the sulfuric acid solution and the geometry of the system; To be at temperature The saturated vapor pressure at a given temperature varies with temperature and can be obtained through empirical formulas or by looking up tables. This is the actual vapor pressure, obtained through experimental data.

[0129] Once the evaporation rate is known... This allows us to calculate the volume of sulfuric acid solution evaporated per unit time. Assume the evaporation occurs in the cuboid portion above tank 1, with a base area of... Therefore, the volume evaporated per unit time is:

[0130] ;

[0131] in, This represents the volume of sulfuric acid solution that evaporates per unit time. For time intervals; This is the density of the sulfuric acid solution.

[0132] but:

[0133] ;

[0134] in, The height by which the sulfuric acid solution decreases due to temperature;

[0135] ;

[0136] in, The optimized liquid level value;

[0137] if If so, reduce the volume of sulfuric acid solution in tank 1 before adjusting the concentration.

[0138] By considering the effect of temperature on the volume of sulfuric acid solution, changes in liquid level can be predicted more accurately, thereby avoiding accidental overflows or shortages. Precise control of the liquid level can reduce the risk of equipment damage, thereby reducing maintenance costs. The system can better adapt to changes in ambient temperature, improving its adaptability under different environmental conditions.

[0139] The adjustment verification module 203 is used to adjust the parameters in the controller 204 according to the concentration value transmitted by the analysis and prediction module 202, continuously monitor the liquid level value in the controller 204, and determine whether the liquid level exceeds the preset safety threshold. If the liquid level value does not exceed the preset safety threshold, the concentration adjustment value is transmitted to the execution control unit 30. Otherwise, the result of the judgment (e.g., the predicted liquid level will exceed the limit or is close to the limit) is fed back to the analysis and prediction module 202 so that it can start the above-mentioned adjustment strategy correction mechanism.

[0140] The adjustment and verification module 203 is used to convert the concentration adjustment command or target value transmitted by the analysis and prediction module 202 into a specific set value or adjustment command for the underlying control loop (such as the control parameters of the material addition pump, valve opening, etc.) running in the controller 204. It continuously monitors the liquid level value obtained by the controller 204 through the sensor interface and determines whether the liquid level exceeds the preset safety threshold. If the liquid level value does not exceed the preset safety threshold, the final confirmed concentration adjustment value (or execution command) is transmitted to the execution control unit 30. Otherwise, the result of the judgment is fed back to the analysis and prediction module 202.

[0141] The execution control unit 30 is used to update the concentration adjustment value of the sulfuric acid solution in tank 1 and continuously monitor the internal conditions of tank 1. An alarm is triggered if any abnormality occurs. Abnormalities include the sulfuric acid solution temperature exceeding its safety threshold, the sulfuric acid solution level exceeding its safety threshold, and the sulfuric acid solution concentration exceeding its safety threshold. An alarm is triggered if any one of these conditions occurs. The execution control unit 30 is responsible not only for performing concentration adjustments but also for monitoring the internal conditions of the tank, ensuring the safety and stability of the production process. Through continuous monitoring and timely response, potential problems can be effectively avoided, improving production efficiency and product quality.

[0142] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A control system for an acid bath plasticizing tank, characterized in that: include: Data collection unit (10): used to collect real-time data related to sulfuric acid solution in tank (1), wherein the real-time data includes physical state parameters of sulfuric acid solution, sulfuric acid solution concentration data, sulfuric acid solution level data in tank (1) and input power of sulfuric acid solution heating system; Data processing center (20): used to obtain the temperature change trend of sulfuric acid solution based on the collected real-time data related to sulfuric acid solution, adjust the sulfuric acid solution concentration according to the temperature change trend, balance the concentration and the liquid level, and introduce the relationship between temperature and liquid level for optimization; wherein the data processing center (20) includes storage processing module (201), analysis and prediction module (202) and adjustment and verification module (203); the analysis and prediction module (202) involves obtaining the sulfuric acid solution concentration adjustment value according to the temperature change trend, as follows: in, For sulfuric acid solution at temperature Solubility at that time; For sulfuric acid solution at the reference temperature Solubility at [specific value]; Temperature coefficient; This is the current temperature of the sulfuric acid solution; The reference temperature for the sulfuric acid solution; in, For sulfuric acid solution at the reference temperature Below, at concentration The calculated theoretical mass of solute; This represents the target concentration that the sulfuric acid solution needs to maintain. The volume of the reference solution; in, To be at temperature Below is the target mass of the solute in the sulfuric acid solution after adjustment based on the solubility ratio; in, The recommended change in solute mass; if If the target solute mass should be increased, then solute needs to be added to the sulfuric acid solution; if If the target solute mass should be relatively reduced, then a diluent needs to be added to the sulfuric acid solution to reduce the final mass of the solute. Meets the set concentration requirements; execute control unit (30): used to update the concentration adjustment value of sulfuric acid solution in tank (1) and continuously observe the situation inside tank (1). If an abnormal situation occurs, an alarm will be triggered.

2. The control system for the acid bath plasticizing tank according to claim 1, characterized in that: The data processing center (20) also includes a controller (204), in which the algorithm model and main operation logic of the analysis and prediction module (202) are executed. The controller (204) can verify the input parameters.

3. The control system for the acid bath plasticizing tank according to claim 2, characterized in that: In the data processing center (20), the storage processing module (201) is used to store the collected real-time data related to sulfuric acid solution and the historical data related to sulfuric acid solution, and to preprocess the real-time data; the analysis and prediction module (202) is used to predict the temperature change trend of sulfuric acid solution based on the data of the storage processing module (201), and to obtain the sulfuric acid solution concentration adjustment value based on the temperature change trend, and to adjust the balance between the concentration and the sulfuric acid solution level based on the concentration adjustment value. If the predicted level is within an acceptable range, the concentration adjustment value is transmitted to the adjustment verification module (203), and the analysis and prediction module will re-evaluate the concentration adjustment strategy based on the feedback result of the adjustment verification module (203); the adjustment verification module (203) is used to adjust the parameters in the controller (204) based on the concentration value transmitted by the analysis and prediction module (202), continuously monitor the level value in the controller (204), and determine whether the level exceeds the preset safety threshold. If the level value does not exceed the preset safety threshold, the concentration adjustment value is transmitted to the execution control unit (30). Otherwise, the result of the judgment is fed back to the analysis and prediction module (202).

4. The control system for the acid bath plasticizing tank according to claim 3, characterized in that: The analysis and prediction module (202) involves predicting the temperature change trend of sulfuric acid solution based on the data from the storage and processing module (201), specifically as follows: S1. Extract key features from the data in the storage and processing module (201) and standardize the key features to the same scale; wherein, the key features include the sliding window average of the time series data. Rate of change of temperature Input power of the heating system S2. Construct the LSTM model.

5. The control system for the acid bath plasticizing tank according to claim 4, characterized in that: The analysis and prediction module (202) involves adjusting the balance between the concentration and the sulfuric acid solution level based on the concentration adjustment value, as follows: in, To increase or decrease the change in volume of sulfuric acid solution after adjusting the substances; The actual mass of solute or diluent added; The density of the added solute or diluent.

6. The control system for the acid bath plasticizing tank according to claim 5, characterized in that: When adjusting the balance between the concentration and the liquid level, the relationship between temperature and liquid level is introduced for optimization, specifically: in, This represents the evaporation rate of the sulfuric acid solution. It is a proportionality constant; To be at temperature The saturated vapor pressure below; This is the actual vapor pressure; in, This represents the volume of sulfuric acid solution that evaporates per unit time. For time intervals; The density of the sulfuric acid solution; It is the base area of ​​the cuboid above the tank.

7. The control system for the acid bath plasticizing tank according to claim 6, characterized in that: Abnormal conditions in the execution control unit (30) include sulfuric acid solution temperature exceeding its safety threshold, sulfuric acid solution level exceeding its safety threshold, and sulfuric acid solution concentration exceeding its safety threshold. An alarm will be triggered if any one of these conditions occurs.

8. An acid bath plasticizing tank, used in the control system of an acid bath plasticizing tank as described in any one of claims 1-7, characterized in that: The tank (1) includes a temperature sensor, a concentration sensor and a liquid level sensor installed on the inner wall of the tank (1). The temperature sensor is used to detect the temperature data of the sulfuric acid solution, the concentration sensor is used to detect the concentration data of the sulfuric acid solution and the liquid level sensor is used to monitor the liquid level data of the sulfuric acid solution. A steam pipe (3) is provided near the bottom inside the tank (1). The steam pipe (3) is connected to the sulfuric acid solution heating system. The sulfuric acid solution heating system adjusts the temperature of the steam pipe (3) to control the temperature of the sulfuric acid solution. A drain pipe (4) is connected to the bottom of the tank (1). When it is necessary to reduce the volume of the sulfuric acid solution, the sulfuric acid solution is discharged from the drain pipe (4). A control valve (41) is provided above the drain pipe (4).

9. The acid bath plasticizing tank according to claim 8, characterized in that: A transparent cover (2) is hinged to one side of the tank (1). A handle (24) is fixedly installed on the outer surface of the transparent cover (2). Several wire pressing parts (22) are fixedly installed on the inner surface of the transparent cover (2). Wire guide ports (23) are fixedly installed on both sides of the inner surface of the transparent cover (2). Several flexible hoses (21) are opened through the tank (1). The flexible hoses (21) are used to discharge the vapor of the sulfuric acid solution. Several flexible hoses (21) and several wire pressing parts (22) are evenly distributed.

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