Acid bath plasticizing tank and control system thereof

Abstract

The invention 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 and liquid level of the sulfuric acid solution in the tank body and the input power of the heating system in real time. The data processing center comprises a storage processing module, an analysis prediction module and an adjustment verification module, predicts a solution temperature change trend through a long short-term memory (LSTM) model, dynamically calculates a concentration adjustment value based on a solubility temperature function, and introduces an evaporation effect to carry out compensation optimization on liquid level change, thereby realizing accurate balance adjustment of the concentration and the liquid level. And the execution control unit executes the final concentration adjustment instruction, continuously monitors the state in the tank, and gives an alarm when the temperature, concentration or liquid level of the solution exceeds a safety threshold value.

Description

Technical Field

[0001] The present invention relates to the technical field of acid bath plasticizing tanks, in particular to an acid bath plasticizing tank and a control system thereof. Background Art

[0002] With the development of the chemical fiber industry, various new fiber products are becoming more and more common. In the production of viscose staple fibers, the acid station must deliver the acid bath that meets the requirements to the acid bath tank of the spinning machine to ensure the normal operation of the spinning machine. Acid bath treatment is an important process in spinning. The spinning must first undergo acid bath treatment before entering the spinning machine. The quality of the acid bath directly affects the quality of the finished product. Unstable liquid level will lead to unstable production process, affecting production efficiency and product quality. Too high liquid level will damage the tank structure, and too low liquid level will cause overheating and damage to the heating element. Therefore, in the existing technology, the prediction of liquid level does not take into account the influence of temperature. The change of temperature will cause the liquid volume to change, which in turn affects the liquid level. Failure to consider the influence of temperature will cause the liquid level to be too high and overflow, or the liquid level to be too low and unable to meet production needs. Therefore, an acid bath plasticizing tank and its control system are designed. Summary of the Invention

[0003] The purpose of the present invention is to provide an acid bath plasticizing tank and its control system to solve the problem that the liquid level prediction proposed in the above background technology does not take into account the influence of temperature, resulting in the liquid level being too high and overflowing, or the liquid level being too low and unable to meet production needs.

[0004] To achieve the above object, the present invention provides an acid bath plasticizing tank and a control system thereof, comprising: Data collection unit: used to collect real-time data related to the sulfuric acid solution in the tank, wherein the real-time data includes physical state parameters of the sulfuric acid solution, sulfuric acid solution concentration data, sulfuric acid solution level data in the tank, and input power to the sulfuric acid solution heating system; Data processing center: used to obtain the temperature 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 trend, balance the concentration and liquid level, and introduce the relationship between temperature and liquid level for optimization; Among them, the data processing center includes a storage and processing module, an analysis and prediction module, and an adjustment and verification module; Execution control unit: used to update the concentration adjustment value of the sulfuric acid solution in the tank, and continuously observe the situation inside the tank, and issue an alarm if any abnormal situation occurs.

[0005] As a further improvement of the present technical solution, the data processing center further includes a controller, the algorithm model and main operation logic of the analysis and prediction module are executed in the controller, and the controller can verify the input parameters.

[0006] As a further improvement of the present technical solution, in the data processing center, the storage and processing module is used to store the collected real-time data related to the sulfuric acid solution and the historical data related to the sulfuric acid solution, and pre-process the real-time data; The analysis and prediction module is used to predict the temperature change trend of the sulfuric acid solution based on the data of the storage and processing module, and 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 liquid level is within an acceptable range, the concentration adjustment value is transmitted to the adjustment verification module. Based on the feedback result of the adjustment verification module, the analysis and prediction module will re-evaluate the concentration adjustment strategy; The adjustment verification module is used to adjust the parameters in the controller according to 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 continues to 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.

[0007] As a further improvement of the present technical solution, the analysis and prediction module involves predicting the temperature trend of the sulfuric acid solution based on the data of the storage and processing module, as follows: S1. Extract key features from the data in the storage processing module and standardize the key features to the same scale; the key features include the sliding window average of the time series data , the rate of change of temperature , Input power of heating system ; S2. Build LSTM model: Internal state of LSTM unit: ; in, is the cell state at the current time step; is the output of the forget gate; is the cell state at the previous time step; is the output of the input gate; is the candidate unit status; represents element-wise multiplication; Output of LSTM cell: ; in, is the hidden state of the current time step; is the output of the output gate; is the hyperbolic tangent function; ; ; ; in, is the Sigmoid activation function; is the weight matrix of the forget gate; is the hidden state of the previous time step; is the input feature vector; ; is the bias term of the forget gate; is the weight matrix of the input gate; is the bias term of the input gate; is the weight matrix of the output gate; is the bias term of the output gate; ; in, is the weight matrix of the candidate unit; is the bias term of the candidate unit; ; in, The predicted sulfuric acid solution at time Temperature value at the moment; is the weight matrix from the hidden state to the output layer; is the bias term of the output layer.

[0008] As a further improvement of the present technical solution, the analysis and prediction module involves obtaining the sulfuric acid solution concentration adjustment value according to the temperature change trend, as follows: ; in, Sulfuric acid solution at temperature Solubility at ; The sulfuric acid solution at the reference temperature Solubility under is the temperature coefficient; is the current temperature of the sulfuric acid solution; is the reference temperature of sulfuric acid solution; the change in solution volume due to the addition of solute can be ignored.

[0009] ; in, The sulfuric acid solution at the reference temperature Next, with concentration The calculated mass of the theoretical solute; The target concentration of sulfuric acid solution to be maintained; is the volume of the reference solution; ; in, For the temperature Target mass of solute in sulfuric acid solution after adjustment based on solubility ratio; ; in, is the suggested change in solute mass; if , that is, the target solute mass should be increased, solute needs to be added to the sulfuric acid solution; if , that is, the mass of the target solute should be relatively reduced, then it is necessary to add diluent to the sulfuric acid solution; The final mass of the solute Meet the set concentration requirements.

[0010] As a further improvement of the present technical solution, the balance between the concentration and the level of the sulfuric acid solution is adjusted according to the concentration adjustment value in the analysis and prediction module, as follows: ; in, The change in volume of sulfuric acid solution after adding or subtracting the adjustment substance; is the mass of the solute or diluent actually added; is the density of the added solute or diluent; ; in, The height of the sulfuric acid solution increases or decreases; is the bottom area of ​​the cuboid above the trough; ; in, is the liquid level value of sulfuric acid solution; is the original height of the sulfuric acid solution; if , then reduce the volume of sulfuric acid solution in the tank before adjusting the concentration. The maximum safe liquid height of the container; ; in, is the volume of sulfuric acid solution that needs to be reduced.

[0011] As a further improvement of the present technical solution, the relationship between temperature and liquid level is introduced to optimize the balance between the concentration and liquid level, specifically: ; in, is the evaporation rate of sulfuric acid solution; is the proportionality constant; For the temperature Saturated vapor pressure under is the actual vapor pressure; ; in, is the volume of sulfuric acid solution evaporated per unit time; is the time interval; is the density of sulfuric acid solution; but: ; in, The height to which the sulfuric acid solution is lowered due to temperature; ; in, is the optimized liquid level value; if , reduce the volume of sulfuric acid solution in the tank before adjusting the concentration.

[0012] As a further improvement of the present technical solution, the abnormal conditions in the execution control unit include the temperature of the sulfuric acid solution exceeding its safety threshold, the liquid level of the sulfuric acid solution exceeding its safety threshold, and the concentration of the sulfuric acid solution exceeding its safety threshold. As long as any one of these conditions occurs, an alarm will be issued.

[0013] Provided is an acid bath plasticizing tank, comprising a tank body. A temperature sensor, a concentration sensor, and a liquid level sensor are installed on the inner wall of the tank body. The temperature sensor is used to detect temperature data of a sulfuric acid solution, the concentration sensor is used to detect concentration data of the sulfuric acid solution, and the liquid level sensor is used to monitor liquid level data of the sulfuric acid solution. A steam pipe is provided near the bottom of the tank body, the steam pipe is connected to a sulfuric acid solution heating system, and the sulfuric acid solution heating system adjusts 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 the volume of the sulfuric acid solution needs to be reduced, the sulfuric acid solution is discharged from the drain pipe. A control valve is provided above the drain pipe.

[0014] As a further improvement of the present technical solution, a transparent cover is hingedly installed on one side of the trough body, a handle is fixedly installed on the outer surface of the transparent cover, a plurality 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 plurality of hoses are opened through the trough body, and the hoses are used to discharge the vapor of the sulfuric acid solution. The plurality of hoses and the plurality of wire pressing parts are evenly distributed.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 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, changes in the sulfuric acid solution level can be predicted more accurately, thereby avoiding accidental overflow or shortage. By precisely controlling the sulfuric acid solution level, the risk of damage to the tank body can be reduced, thereby reducing maintenance costs. The system can better adapt to changes in ambient temperature, thereby improving its adaptability to different environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the overall flow chart of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0017] The meaning of each number in the figure is: 1. Tank; 2. Transparent cover; 21. Hose; 22. Wire pressing piece; 23. Wire guide port; 24. Handle; 3. Steam pipe; 4. Drain pipe; 41. Control valve; 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 DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 2As shown, 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 of the tank body 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, thereby controlling the temperature of the sulfuric acid solution, which can effectively heat the sulfuric acid solution and ensure the temperature conditions required for the sulfuric acid solution during the plasticizing process. The steam pipe is powered by the heating system 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 the volume of the sulfuric acid solution needs to be reduced, the sulfuric acid solution is discharged from the drain pipe 4. A control valve 41 is provided above the drain pipe 4. The flow rate is adjusted by the control valve, which helps to accurately control the discharge speed and amount to avoid unnecessary waste or overflow.

[0020] A transparent cover 2 is hingedly installed on one side of the trough body 1. The cover made of transparent material allows the operator to observe the situation inside the trough body 1 at any time, such as the state of the sulfuric acid solution and the direction of the fiber. A handle 24 is fixedly installed on the outer surface of the transparent cover 2, and a plurality of 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 to an arc shape or a U shape, and wire guide ports 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 to ensure that they are evenly contacted with the sulfuric acid solution, thereby improving the processing quality and efficiency. A plurality of hoses 21 are opened through the trough body 1. These hoses 21 are channels for introducing or discharging sulfuric acid solution vapor gas or liquid, which helps to maintain a stable working environment in the trough body 1 while ensuring smooth passage of fibers or yarns. The plurality of hoses 21 and the plurality of wire pressing parts 22 are evenly distributed.

[0021] It should be noted that sealing rubber rings are provided on the transparent cover 2 and the top surface of the tank body 1. When the transparent cover 2 and the tank body 1 are in a closed state, the sealing rubber rings are in close contact with each other to achieve a better sealing effect.

[0022] See also Figure 1 As shown, a control system for an acid bath plasticizing tank is provided. The method mainly adjusts the concentration in advance by predicting temperature changes, balances the relationship between the concentration and the liquid level when adjusting the concentration, and introduces the relationship between the temperature and the liquid level to optimize when balancing the concentration and the liquid level, so as to ensure the stability and efficiency of the production process. The method includes a data collection unit 10, a data processing center 20 and an execution control unit 30; The data collection unit 10 is used to collect real-time data related to the sulfuric acid solution in the tank body 1, wherein the real-time data includes physical state parameters of the sulfuric acid solution, concentration data of the sulfuric acid solution, liquid level data of the sulfuric acid solution in the tank body 1, and input power to the sulfuric acid solution heating system; The data processing center 20 is used to obtain a temperature 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 trend, balance the concentration and the liquid level, and introduce the relationship between the temperature and the liquid level 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. The data processing center 20 is provided 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.

[0023] In the data processing center 20, the storage processing module 201 is used to store the collected real-time data related to the sulfuric acid solution and the historical data related to the sulfuric acid solution, and pre-process the real-time data; The analysis and prediction module 202 is used to predict the temperature change trend of the sulfuric acid solution based on the data of the storage and processing module 201, and 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. When the predicted liquid level is within an acceptable range, the concentration adjustment value is transmitted to the adjustment verification module 203, and based on the feedback result of the adjustment verification module 203 (for example, if the feedback liquid level may exceed the limit), the analysis and prediction module will re-evaluate the concentration adjustment strategy, including batch adjustment, discharging part of the solution before adjustment, or fine-tuning the concentration target value within the allowable process range, etc., to ensure liquid level safety; it can predict the future temperature change trend, provide a basis for adjusting the concentration, automatically adjust the concentration and liquid level according to the prediction results, reduce the need for manual intervention, and improve production efficiency and quality by optimizing the balance between concentration and liquid level.

[0024] The analysis and prediction module 202 predicts the temperature change trend based on the data stored in the processing module 201, as follows: S1. Extract key features from the data in the 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 , the rate of change of temperature , Input power of heating system ; S2. Build LSTM model: 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, and a smaller value is usually selected to reduce model complexity. The output layer has only one node, which is used to predict the temperature value at the next time step. Internal state of LSTM unit: ; in, is the cell state at the current time step; is the output of the forget gate; is the cell state at the previous time step; is the output of the input gate; is the candidate unit status; represents element-wise multiplication; Output of LSTM cell: ; in, is the hidden state of the current time step; is the output of the output gate; It is the hyperbolic tangent function, which is used to introduce nonlinear characteristics in neural networks; The cell state at the current time step is After passing through the tanh function, it is then combined with the output of the output gate The tanh function is used to convert the cell state Map to The output of the output gate determines which information should be passed to the next time step. ; ; ; in, is the Sigmoid activation function; is the weight matrix of the forget gate; is the hidden state of the previous time step; is the input feature vector; ; is the bias term of the forget gate; is the weight matrix of the input gate; is the bias term of the input gate; is the weight matrix of the output gate; is the bias term of the output gate; ; in, is the weight matrix of the candidate unit; is the bias term of the candidate unit; This is done by adding the hidden state of the previous time step and the input features of the current time step Through a linear transformation and bias After that, go through Function obtained. The function here is to map the result of the linear transformation to Within the interval, candidate cell states are generated; ; in, The predicted sulfuric acid solution at time Temperature value at the moment; is the weight matrix from the hidden state to the output layer; is the bias term of the output layer.

[0025] The analysis and prediction module 202 involves obtaining a concentration adjustment value based on the temperature change trend, as follows: Temperature affects the solubility of the solute. Some substances increase in solubility with increasing temperature, while others decrease. Therefore, temperature changes may affect the maximum soluble concentration of sulfuric acid solution. When the working concentration is set When the solubility is close to saturation, it is necessary to adjust the amount of raw materials added to compensate for this change in order to maintain the working concentration or avoid precipitation. For the sulfuric acid solution in the plasticizing tank, if the temperature change affects the solubility of the solute, then the amount of raw materials added needs to be adjusted to compensate for this change. Assume that the solubility of the solute in the sulfuric acid solution in this example increases with increasing temperature; ; in, For sulfuric acid solution at temperature Solubility at ; The sulfuric acid solution at the reference temperature Solubility under is the temperature coefficient, which takes a positive value if the solubility increases with increasing temperature, and a negative value otherwise; is the current temperature of the sulfuric acid solution; is the reference temperature of sulfuric acid solution; In this example, the solvent volume during the initial analysis was If the concentration of solute in sulfuric acid solution remains relatively unchanged, It can be expressed as the mass of solute Divide by the solvent volume .

[0026] To maintain the concentration of solute in sulfuric acid solution At a set point , the mass of the solute needs to be adjusted according to the temperature change Specifically, when the temperature changes, the solubility When the concentration changes, in order to maintain the concentration as much as possible while considering the influence of solubility Invariant Approximation , the amount of solute added needs to be adjusted .

[0027] ; in, The sulfuric acid solution at the reference temperature Next, with concentration The calculated mass of the theoretical solute; The target concentration of sulfuric acid solution to be maintained; Calculate an adjusted target solute mass for the volume of the reference solution, taking into account the change in solubility with temperature ,as follows; ; in, For the temperature Under the condition of saturation, the target mass of the solute in the sulfuric acid solution after adjustment based on the solubility ratio is set; the purpose is to adjust the solute content proportionally according to the solubility change when the actual operating concentration is close to saturation, so as to maintain a concentration similar to the saturation level under the new temperature conditions, or in other words, if It itself represents Under a certain saturation ratio, To maintain the same saturation ratio at the same temperature, the amount of solute added needs to be adjusted according to the temperature change in order to maintain the solution concentration adjusted to the target state related to temperature. ; ; in, is the suggested change in solute mass; if , that is, the mass of the target solute should be increased, solute (or concentrated sulfuric acid) needs to be added to the sulfuric acid solution; if , that is, the mass of the target solute 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; The final mass of the solute Meet the set concentration requirements, that is, the actual concentration of the solution after adjustment (in is the total volume of the adjusted solution) should be as close as possible or according to Adjusted target concentration.

[0028] Furthermore, the analysis and prediction module 202 involves adjusting the balance between the concentration and the liquid level according to the concentration adjustment value. Since adding solute and diluent to the sulfuric acid solution will increase the volume of the sulfuric acid solution, the liquid level will also increase as the volume of the sulfuric acid solution increases. Specifically, in, The change in volume of sulfuric acid solution after adding or subtracting the adjusting substance (solute or diluent); is the mass of the solute or diluent actually added (its value is based on the above Calculate the result and determine it in combination with the selected materials); is the density of the added solute or diluent; ; in, The height of the sulfuric acid solution increases or decreases; is the bottom area of ​​the rectangular parallelepiped above the tank body 1; in this embodiment, the increase and decrease of the sulfuric acid solution are both carried out in the rectangular parallelepiped above the tank body 1; ; in, is the liquid level value of sulfuric acid solution; is the original height of the sulfuric acid solution; if , is the maximum safe sulfuric acid solution height of the container, then reduce the volume of sulfuric acid solution in the tank (1) before adjusting the concentration. ; in, The volume of the sulfuric acid solution that needs to be reduced is discharged through the drain pipe 4; Since the increase in temperature will increase the evaporation rate of sulfuric acid solution, especially in an open system, this may cause the liquid level of sulfuric acid solution to drop. In order to compensate for the evaporation loss, the supply volume needs to be increased to maintain a stable liquid level. Therefore, when adjusting the balance between concentration and liquid level, the relationship between temperature and liquid level is introduced for optimization, specifically: ; in, is the evaporation rate of sulfuric acid solution (here defined as the mass evaporation rate per unit area, ); is the proportionality constant, which depends on the properties of the sulfuric acid solution and the geometry of the system; For the temperature The saturated vapor pressure under the condition of , which changes with temperature, can be obtained through empirical formula or table; is the actual vapor pressure, obtained from experimental data; Once the evaporation rate , we can calculate the volume of sulfuric acid solution evaporated per unit time. Assuming that evaporation occurs in the rectangular part above the tank 1, its bottom area is , then the volume evaporated per unit time is: ; in, is the volume of sulfuric acid solution evaporated per unit time; is the time interval; is the density of sulfuric acid solution.

[0029] but: ; in, The height to which the sulfuric acid solution is lowered due to temperature; ; in, is the optimized liquid level value; if , then reduce the volume of sulfuric acid solution in tank 1 before adjusting the concentration.

[0030] By considering the effect of temperature on the volume of sulfuric acid solution, changes in liquid level can be predicted more accurately, thereby avoiding unexpected overflows or shortages. Through precise control of the liquid level, the risk of equipment damage can be reduced, thereby reducing maintenance costs. The system can better adapt to changes in ambient temperature, improving its adaptability to different environmental conditions.

[0031] 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 continues to not exceed the preset safety threshold, the concentration adjustment value is transmitted to the execution control unit 30. Otherwise, the judgment result (for example, the prediction that the 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 activate the above-mentioned adjustment strategy correction mechanism; The adjustment verification module 203 is used to convert the concentration adjustment instruction or target value transmitted by the analysis and prediction module 202 into a specific set value or adjustment instruction for the underlying control loop (such as the control parameters of the material addition pump, valve opening, etc.) running in the controller 204, continuously monitor the liquid level value obtained by the controller 204 through the sensor interface, and determine whether the liquid level exceeds the preset safety threshold. If the liquid level value continues to not exceed the preset safety threshold, the final confirmed concentration adjustment value (or execution instruction) is transmitted to the execution control unit 30. Otherwise, the judgment result is fed back to the analysis and prediction module 202; The execution control unit 30 is responsible for updating the concentration adjustment value of the sulfuric acid solution in the tank 1 and continuously monitoring the internal conditions of the tank 1. If any abnormality occurs, an alarm will be issued. Abnormal conditions include the sulfuric acid solution temperature exceeding its safety threshold, the sulfuric acid solution level exceeding its safety threshold, or the sulfuric acid solution concentration exceeding its safety threshold. As long as any of these conditions occur, an alarm will be issued. The execution control unit 30 is responsible not only for executing concentration adjustments but also for monitoring the internal conditions of the tank to ensure the safety and stability of the production process. Through continuous monitoring and timely response, potential problems can be effectively avoided, and production efficiency and product quality can be improved.

[0032] The basic principles, main features, and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention claimed.

Claims

1. A control system for an acid bath plasticizing tank, characterized by: include: A data collection unit (10) is used to collect real-time data related to the sulfuric acid solution in the tank (1), wherein the real-time data includes physical state parameters of the sulfuric acid solution, concentration data of the sulfuric acid solution, liquid level data of the sulfuric acid solution in the tank (1), and input power to the sulfuric acid solution heating system; Data processing center (20): used to obtain the temperature change trend of the sulfuric acid solution based on the real-time data collected 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, while introducing the relationship between temperature and liquid level for optimization; The data processing center (20) includes a storage processing module (201), an analysis and prediction module (202), and an adjustment and verification module (203); An execution control unit (30) is used to update the concentration adjustment value of the sulfuric acid solution in the tank (1), and continuously observe the situation inside the tank (1), and to issue an alarm if an abnormal situation occurs.

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

3. The control system of 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 the sulfuric acid solution and the historical data related to the sulfuric acid solution, and to pre-process the real-time data; The analysis and prediction module (202) is used to predict the temperature change trend of the sulfuric acid solution based on the data of the storage and processing module (201), and obtain the sulfuric acid solution concentration adjustment value according to the temperature change trend, and adjust the balance between the concentration and the sulfuric acid solution level according to the concentration adjustment value. When the predicted liquid level is within an acceptable range, the concentration adjustment value is transmitted to the adjustment verification module (203), and according to the result fed back by the adjustment verification module (203), the analysis and prediction module will re-evaluate the concentration adjustment strategy; 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 judge whether the liquid level exceeds the preset safety threshold. If the liquid level value continues to not exceed the preset safety threshold, the concentration adjustment value is transmitted to the execution control unit (30); otherwise, the judgment result is fed back to the analysis and prediction module (202).

4. The control system of 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 the sulfuric acid solution based on the data of the storage and processing module (201), as follows: S1. Extract key features from the data in the 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 , the rate of change of temperature , Input power of heating system ; S2. Build an LSTM model.

5. The control system of the acid bath plasticizing tank according to claim 4, characterized in that: The analysis and prediction module (202) involves obtaining the sulfuric acid solution concentration adjustment value according to the temperature change trend, as follows: ； in, Sulfuric acid solution at temperature Solubility at ; For sulfuric acid solution at the base temperature Solubility under is the temperature coefficient; is the current temperature of the sulfuric acid solution; is the reference temperature of sulfuric acid solution; ； in, The sulfuric acid solution at the reference temperature Next, with concentration The calculated mass of the theoretical solute; The target concentration of sulfuric acid solution to be maintained; is the volume of the reference solution; ； in, For the temperature Target mass of solute in sulfuric acid solution after adjustment based on solubility ratio; ； in, is the suggested change in solute mass; if , that is, the target solute mass should be increased, solute needs to be added to the sulfuric acid solution; if , that is, the mass of the target solute should be relatively reduced, then it is necessary to add diluent to the sulfuric acid solution; The final mass of the solute Meet the set concentration requirements.

6. The control system of the acid bath plasticizing tank according to claim 5, characterized in that: The analysis and prediction module (202) involves adjusting the balance between the concentration and the level of the sulfuric acid solution according to the concentration adjustment value, as follows: ； in, The change in volume of sulfuric acid solution after adding or subtracting the adjustment substance; is the mass of the solute or diluent actually added; is the density of the added solute or diluent.

7. The control system of the acid bath plasticizing tank according to claim 6, characterized in that: When adjusting the balance between the concentration and the liquid level, the relationship between the temperature and the liquid level is introduced for optimization, specifically: ； in, is the evaporation rate of sulfuric acid solution; is the proportionality constant; For the temperature Saturated vapor pressure under is the actual vapor pressure; ； in, is the volume of sulfuric acid solution evaporated per unit time; is the time interval; is the density of sulfuric acid solution.

8. The control system of the acid bath plasticizing tank according to claim 7, characterized in that: Abnormal conditions in the execution control unit (30) include the temperature of the sulfuric acid solution exceeding its safety threshold, the level of the sulfuric acid solution exceeding its safety threshold, and the concentration of the sulfuric acid solution exceeding its safety threshold. As long as any of these conditions occurs, an alarm will be issued.

9. An acid bath plasticizing tank, used for a control system of an acid bath plasticizing tank according to any one of claims 1 to 8, characterized in that: The invention comprises a tank body (1), wherein a temperature sensor, a concentration sensor and a liquid level sensor are installed on the inner wall of the tank body (1), wherein 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 of the tank body (1), wherein the steam pipe (3) is connected to the sulfuric acid solution heating system, and 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 body (1), and when the volume of the sulfuric acid solution needs to be reduced, the sulfuric acid solution is discharged from the drain pipe (4). A control valve (41) is provided above the drain pipe (4).

10. The acid bath plasticizing tank according to claim 9, characterized in that: A transparent cover (2) is hingedly mounted on one side of the trough body (1), a handle (24) is fixedly mounted on the outer surface of the transparent cover (2), a plurality of wire pressing members (22) are fixedly mounted on the inner surface of the transparent cover (2), and wire guide ports (23) are fixedly mounted on both sides of the inner surface of the transparent cover (2), a plurality of hoses (21) are penetrated through the trough body (1), the hoses (21) are used to discharge the steam of the sulfuric acid solution, and the plurality of hoses (21) and the plurality of wire pressing members (22) are evenly distributed.

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