Control system and method for optimizing beating degree of flat base paper

Abstract

The invention relates to the technical field of papermaking, and particularly discloses a control system and method for optimizing the beating degree of flat base paper. The system takes'two-dimensional monitoring and multivariable coordinated regulation 'as a core, realizes parallel monitoring by integrating a beating degree sensor, a fiber form analyzer and the like, performs fusion calculation on detection data, and performs synchronous closed-loop control on the beating concentration, the beating pressure and the beating effective power on the basis, so that the pulping efficiency is improved. And finally, fine regulation and control of the fiber fibrillation process are realized. According to the method provided by the invention, the beating degree can be stably controlled in a target interval from 65 degrees SR to 85 degrees SR, and meanwhile, the following two performances are improved: on one hand, fibers are uniformly distributed, and on the other hand, the electrical insulation strength and the mechanical property uniformity of finished paper are remarkably improved. Therefore, the technical bottleneck that according to an existing papermaking pulping process, high-precision, dynamic and refined regulation and control of the pulp degree parameters are difficult to achieve is solved.

Description

Technical Field

[0001] This application relates to papermaking technology, and more particularly to a control system and method for optimizing the beating degree of flat base paper. Background Technology

[0002] Flat sheet paper, as the core substrate for the insulation layer of critical electrical equipment such as transformers, instrument transformers, and high-voltage cables, directly determines the safe and stable operation of these electrical devices under long-term high-voltage conditions. It is one of the important basic materials for ensuring the reliability of power transmission in power systems. In the preparation process of flat sheet paper, the beating degree is the core process indicator for controlling the degree of fiber fibrillation. Its value directly affects the mechanical strength and electrical insulation performance of the finished paper: when the beating degree is too low, the fiber fibrillation is insufficient, the bonding force between paper fibers is weak, and the mechanical properties are easily insufficient; when the beating degree is too high, the fibers are excessively cut, which leads to a decrease in the insulation performance of the paper, making it difficult to meet the insulation requirements of high-voltage electrical equipment.

[0003] However, the control of beating degree in the current production process of flat base paper mostly adopts traditional empirical methods. These methods have significant technical defects: on the one hand, the control logic relies only on the adjustment of a single variable (such as beating time or beating roll speed), without considering the coupling relationship between multiple process variables such as beating concentration, beating pressure and effective power of equipment, and cannot achieve coordinated optimization of various operating parameters; on the other hand, the entire control process relies on the operator's experience judgment, lacks accurate monitoring of real-time beating degree data, and has not established a linkage control mechanism between fiber morphology (such as fiber length and thickness) and beating degree, resulting in a large fluctuation range of beating degree of the finished paper (usually exceeding ±5°SR), which in turn leads to instability in the mechanical strength and insulation performance of the product, making it difficult to meet the stringent requirements of high voltage insulation materials for performance uniformity (deviation needs to be controlled within ±2%) and long-term reliability, and seriously restricting the application and promotion of high-end insulation paper in ultra-high voltage and extra-high voltage electrical equipment.

[0004] Therefore, how to overcome the technical limitations of traditional control methods and develop a process that can collect beating degree data and fiber morphology information in real time, and realize dynamic and precise control of beating degree based on multi-variable collaborative regulation logic, so as to reduce the performance fluctuation of flat base paper and improve its ability to adapt to high-voltage electrical equipment, has become a key technical problem that urgently needs to be solved in the current field of insulating paper preparation. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a control system and method for optimizing the beating degree of flat paper, in order to solve the technical bottleneck of existing papermaking pulping processes that make it difficult to achieve high-precision, dynamic and fine control of pulping parameters.

[0006] To achieve the above technical objectives, this application provides a control system for optimizing the freeness of flat base paper, including: a freeness module, a data analysis module, and a control module;

[0007] The pulping module includes a pulp inlet, a pulping chamber, a pulper, and a data acquisition card;

[0008] The pulp inlet is equipped with a pressure sensor and a concentration sensor. The pressure sensor is used to collect the conveying pressure of the pulp at the pulp inlet in real time, and the concentration sensor is used to monitor the pulp concentration at the pulp inlet.

[0009] The beating chamber includes an online beating instrument, a fiber morphology detector, and a speed sensor. The online beating instrument is used to detect the pulp consistency inside the beating chamber in real time. The fiber morphology detector is used to image the pulp in real time and output microscopic parameters such as the average length of pulp fibers and the fibrillation index. The speed sensor is used to monitor the real-time rotational speed of the rotor inside the beating chamber.

[0010] The pulper is located inside the pulping chamber and includes a frequency converter and an electromagnetic flow valve. The frequency converter is used to receive instructions from the control module to adjust the rotor speed of the pulper, and the electromagnetic flow valve is used to regulate the flow rate of pulp entering the pulping chamber.

[0011] One end of the data acquisition card is connected to the pressure sensor, concentration sensor, online percussion instrument, fiber morphology detector, and speed sensor at the pulp inlet via a signal cable. The other end is connected to the data analysis module via communication to realize the real-time acquisition and transmission of detection data.

[0012] The data analysis module is used to receive the detection data transmitted by the data acquisition card. The data analysis module includes a data preprocessing module and a deviation analysis module; the control module is used to regulate the frequency converter and electromagnetic flow valve of the pulping machine.

[0013] Furthermore, the data preprocessing module receives data transmitted from the data acquisition card, performs data calibration and feature extraction operations in sequence, and then outputs standardized real-time data.

[0014] Furthermore, the deviation analysis module has a built-in target parameter database. The deviation analysis module is used to compare real-time data with the parameters in the target parameter database and issue the following instructions:

[0015] If the freeness is between 65°SR and 85°SR and the fiber fibrillation rate is greater than or equal to 0.4, the process is considered normal, and an instruction to maintain the current parameters is generated.

[0016] If the beating degree is less than 65°SR or the fiber fibrillation rate is greater than 0.4, it is determined to be insufficient beating. Then, the beating degree deviation value is calculated to generate a set of control strategies to increase the frequency of the variable frequency drive and / or reduce the opening of the electromagnetic flow valve.

[0017] If the beating degree is greater than 85°SR, it is determined to be over-beating. Then, the beating degree deviation value is calculated to generate a set of control strategies to reduce the frequency of the variable frequency drive and / or increase the opening of the electromagnetic flow valve.

[0018] Furthermore, the edge computing cabinet module of the data analysis module provides computing power support for the data preprocessing module and the deviation analysis module: when the deviation analysis module detects that the freeness is within the preset target parameter range, but the fiber buffing rate has not reached the target value, the edge computing cabinet module automatically triggers the dynamic threshold adjustment mechanism to narrow the target parameter range of the freeness.

[0019] Furthermore, the control module has built-in priority rules, which are ordered as follows: speed adjustment, flow rate adjustment;

[0020] After receiving the set of control strategies transmitted by the data analysis module, the control module selects the appropriate control scheme from the set of control strategies based on priority rules, and converts the control scheme into standardized control commands to be output to the variable frequency speed controller and electromagnetic flow valve in the pulping module, so as to achieve precise control of the operating parameters of the pulping module.

[0021] This application provides a method for using a control system for optimizing the freeness of flat base paper, including the following steps;

[0022] Step 1: Set the target range of freeness, target parameters of fiber morphology, and control response threshold in the target parameter database of the deviation analysis module;

[0023] Step 2: Start the system. The pulping module detects data at a preset detection frequency, and the data acquisition card transmits the detection data to the data analysis module.

[0024] Step 3: After receiving the test data, the data analysis module calibrates the test data to extract the mean freeness and the standard deviation of fiber fibrillation rate. The mean freeness and the standard deviation of fiber fibrillation rate are compared with the target parameters to select the set of control strategies.

[0025] Step 4: The control module receives the control strategy set transmitted by the data analysis module, converts the control strategy set into corresponding signals and outputs them to the pulping machine of the pulping module. At the same time, the effectiveness of the control strategy set is verified by the detection data of the pulping chamber.

[0026] Step 5: Repeat steps 2 to 4 until the detection data is within the target parameter range.

[0027] Furthermore, the pressure sensor and concentration sensor at the pulp inlet, the online percussion instrument, fiber morphology detector, and speed sensor in the pulping chamber all operate synchronously with a data acquisition interval of 500ms.

[0028] Furthermore, the standard for the control module to determine whether the adjustment strategy is effective is as follows: after the variable frequency drive and the electromagnetic flow valve execute the standardized control command, the actual output frequency of the variable frequency drive and the actual opening of the electromagnetic flow valve are compared with the command parameters output by the control module. When the deviation is less than 2%, the dynamic parameter adjustment is deemed effective; if the deviation is greater than 2%, the control module regenerates the fine-tuning command until the deviation is less than ±2%.

[0029] This application provides a control system for optimizing the beating degree of flat paper in the beating control of flat paper.

[0030] This application provides a papermaking system, including a control system for optimizing the beating degree of flat base paper or a method of using the control system for optimizing the beating degree of flat base paper.

[0031] In summary, this application provides a control system for optimizing the freeness of flat paper. This system, centered on "dual-dimensional monitoring and multi-variable collaborative regulation," achieves parallel monitoring by integrating a freeness sensor and a fiber morphology analyzer. It fuses and calculates multi-source detection data, and then implements synchronous closed-loop control of three core operating variables: beating concentration, beating pressure, and effective beating power. Ultimately, this achieves refined regulation of the fiber fracturing process. The method provided in this application can stably control the freeness within the target range of 65°SR to 85°SR, while simultaneously improving two major performance aspects: firstly, significantly enhancing the electrical insulation strength and mechanical property uniformity of the finished paper; and secondly, ensuring uniform fiber distribution. Furthermore, it can correct deviations in the beating process in real time and predictively regulate the fiber fracturing trend.

[0032] Compared with existing technologies, the control system for optimizing the freeness of flat base paper provided in this application has the following advantages: (i) more comprehensive monitoring: combining a freeness sensor and a fiber morphology analyzer to achieve dual-dimensional monitoring of "macro + micro"; (ii) more coordinated regulation: synchronous closed-loop control of freeness concentration, pressure, and effective power, taking into account both freeness stability and paper performance. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a flowchart illustrating the operation of a control system for optimizing the beating degree of flat base paper, provided in an embodiment of this application. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments in this application specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] The raw materials used in this invention are not particularly restricted in their source; they can be purchased on the market or prepared using conventional methods known to those skilled in the art.

[0039] This application provides a control system for optimizing the freeness of flat base paper, including: a freeness module, a data analysis module, and a control module;

[0040] The pulping module includes a pulp inlet, a pulping chamber, a pulper, and a data acquisition card;

[0041] The pulp inlet is equipped with a pressure sensor and a concentration sensor. The pressure sensor is used to collect the conveying pressure of the pulp at the pulp inlet in real time, and the concentration sensor is used to monitor the pulp concentration at the pulp inlet.

[0042] The beating chamber includes an online beating instrument, a fiber morphology detector, and a speed sensor. The online beating instrument is used to detect the pulp consistency inside the beating chamber in real time. The fiber morphology detector is used to image the pulp in real time and output microscopic parameters such as the average length of pulp fibers and the fibrillation index. The speed sensor is used to monitor the real-time rotational speed of the rotor inside the beating chamber.

[0043] The pulper is located inside the pulping chamber and includes a frequency converter and an electromagnetic flow valve. The frequency converter is used to receive instructions from the control module to adjust the rotor speed of the pulper, and the electromagnetic flow valve is used to regulate the flow rate of pulp entering the pulping chamber.

[0044] One end of the data acquisition card is connected to the pressure sensor, concentration sensor, online percussion instrument, fiber morphology detector, and speed sensor at the pulp inlet via a signal cable. The other end is connected to the data analysis module via communication to realize the real-time acquisition and transmission of detection data.

[0045] The data analysis module is used to receive the detection data transmitted by the data acquisition card. The data analysis module includes a data preprocessing module and a deviation analysis module; the control module is used to regulate the frequency converter and electromagnetic flow valve of the pulping machine.

[0046] In some embodiments, the data preprocessing module is used to receive data transmitted by the data acquisition card, perform data calibration and feature extraction operations in sequence, and then output standardized real-time data.

[0047] In some embodiments, the deviation analysis module has a built-in target parameter database. The deviation analysis module compares the real-time data with the parameters in the target parameter database and issues the following instructions: if the freeness is between 65°SR and 85°SR and the fiber fibrillation rate is greater than or equal to 0.4, the process is determined to be normal, and an instruction to maintain the current parameters is generated; if the freeness is less than 65°SR or the fiber fibrillation rate is greater than 0.4, it is determined to be insufficient freeness, and the freeness deviation value is calculated to generate a set of control strategies to increase the frequency of the variable frequency drive and / or decrease the opening of the electromagnetic flow valve; if the freeness is greater than 85°SR, it is determined to be over-freeness, and the freeness deviation value is calculated to generate a set of control strategies to decrease the frequency of the variable frequency drive and / or increase the opening of the electromagnetic flow valve.

[0048] In some specific embodiments, when the pulping is insufficient, the control strategy set includes at least one of "increasing the frequency of the variable frequency drive by 5~10Hz" or "reducing the opening of the electromagnetic flow valve by 5%~8%"; when the pulping is excessive, the control strategy set includes one of "reducing the frequency of the variable frequency drive by 3~8Hz" or "increasing the opening of the electromagnetic flow valve by 3%~5%".

[0049] In some embodiments, the edge computing cabinet module of the data analysis module provides computing power support for the data preprocessing module and the deviation analysis module: when the deviation analysis module detects that the beating degree is within the preset target parameter range, but the fiber buffing rate has not reached the target value, the edge computing cabinet module automatically triggers a dynamic threshold adjustment mechanism to narrow the target parameter range of the beating degree.

[0050] In some specific embodiments, when the freeness is between 65°SR and 85°SR, but the fiber fibrillation rate does not meet the standard, the edge computing box module triggers dynamic threshold adjustment to fine-tune the target freeness range to 68°SR to 82°SR.

[0051] In some embodiments, the control module has built-in priority rules, which are ordered as follows: speed adjustment, flow rate adjustment. After receiving the control strategy set transmitted by the data analysis module, the control module selects the appropriate control scheme from the control strategy set based on the priority rules, and converts the control scheme into standardized control commands to be output to the frequency converter and electromagnetic flow valve in the pulping module, so as to achieve precise control of the operating parameters of the pulping module.

[0052] This application provides a method for using a control system for optimizing the freeness of flat base paper, including the following steps;

[0053] Step 1: Set the target range of freeness, target parameters of fiber morphology, and control response threshold in the target parameter database of the deviation analysis module;

[0054] Step 2: Start the system. The pulping module detects data at a preset detection frequency, and the data acquisition card transmits the detection data to the data analysis module.

[0055] Step 3: After receiving the test data, the data analysis module calibrates the test data to extract the mean freeness and the standard deviation of fiber fibrillation rate. The mean freeness and the standard deviation of fiber fibrillation rate are compared with the target parameters to select the set of control strategies.

[0056] Step 4: The control module receives the control strategy set transmitted by the data analysis module, converts the control strategy set into corresponding signals and outputs them to the pulping machine of the pulping module. At the same time, the effectiveness of the control strategy set is verified by the detection data of the pulping chamber.

[0057] Step 5: Repeat steps 2 to 4 until the detection data is within the target parameter range.

[0058] In some embodiments, the pressure sensor and concentration sensor at the pulp inlet, the online percussion instrument, fiber morphology detector, and speed sensor in the pulping chamber all operate synchronously with a data acquisition interval of 500ms. The fiber morphology detector captures 30 frames of fiber images every 500ms and outputs morphological parameters.

[0059] In some embodiments, the standard for the control module to determine whether the adjustment strategy is effective is as follows: after the variable frequency drive and the electromagnetic flow valve execute the standardized control command, the actual output frequency of the variable frequency drive and the actual opening of the electromagnetic flow valve are compared with the command parameters output by the control module. When the deviation is less than 2%, the dynamic parameter adjustment is determined to be effective; if the deviation is greater than 2%, the control module regenerates the fine-tuning command until the deviation is less than 2%.

[0060] This application provides an embodiment of a control system for optimizing the beating degree of flat paper, which is used in the beating control of flat paper.

[0061] This application provides a papermaking system, including a control system for optimizing the beating degree of flat base paper or a method of using the control system for optimizing the beating degree of flat base paper.

[0062] The applicant further provides the following specific embodiments to describe the present invention. It should be noted that these embodiments are merely descriptive and do not limit the present invention in any way.

[0063] Example 1

[0064] This invention provides a control system for optimizing the beating degree of flat base paper, comprising: a beating module, a data analysis module, and a control module;

[0065] The pulping module includes a pulp inlet, a pulping chamber, a pulper, and a data acquisition card.

[0066] The pulp inlet is equipped with a pressure sensor and a concentration sensor. The pressure sensor is used to collect the conveying pressure of the pulp at the pulp inlet in real time to avoid unstable pulp flow caused by pressure fluctuations. The concentration sensor is used to monitor the concentration of the pulp entering the inlet and provide an initial concentration reference for subsequent pulping parameter adjustments.

[0067] The beating chamber includes an online percussion instrument, a fiber morphology detector, and a speed sensor. The online percussion instrument is used to detect the pulp consistency inside the beating chamber in real time. The fiber morphology detector is used to image the pulp suspension flowing through the flat detection window in real time and output microscopic parameters such as average fiber length and fibrillation index. The speed sensor is used to monitor the real-time rotational speed of the rotor inside the beating chamber and provide feedback on the intensity of the beating mechanical action.

[0068] The pulper includes a frequency converter and an electromagnetic flow valve. The frequency converter receives commands from the control module to adjust the rotor speed of the pulper and change the shear and abrasion intensity of the pulp. The electromagnetic flow valve is used to regulate the flow rate of pulp entering the pulping chamber and match the speed adjustment to maintain a stable pulping time.

[0069] The data acquisition card is an industrial-grade data acquisition card. One end is connected to the pressure sensor and concentration sensor at the pulp inlet, the online percussion instrument, fiber morphology detector and speed sensor in the pulping chamber via a signal cable. The other end is connected to the data analysis module via communication to realize the real-time acquisition and transmission of various detection parameters. The sampling interval is set to 500ms to ensure data timeliness.

[0070] The data analysis module receives data transmitted from the data acquisition card and includes an edge computing cabinet module, a data preprocessing module, and a deviation analysis module.

[0071] Data preprocessing module: Receives the detection data transmitted by the data acquisition card, and sequentially performs data calibration (real-time calibration of parameters such as freeness and concentration based on standard samples) and feature extraction (extracting key feature values ​​such as mean freeness and standard deviation of fiber fibrillation rate), and outputs standardized real-time data.

[0072] Deviation Analysis Module: This module has a built-in target parameter database that stores preset target ranges for freeness (65°SR~85°SR), fiber fibrillation rate (≥0.4), and feed concentration (3%~5%) for flat base paper. It compares real-time data with these target parameters: if the freeness is within the 65°SR~85°SR range and the fiber fibrillation rate is ≥0.4, it is considered "process normal," and a "maintain current parameters" command is generated. If the freeness is <65°SR or the fiber fibrillation rate is <0.4, it is considered "insufficient freeness," and a deviation value is calculated (e.g., freeness deviation = target center value 75°SR - real-time freeness). A preliminary control strategy set is generated, including "increasing the frequency converter frequency by 5~10Hz" and "reducing the electromagnetic flow valve opening by 5%~8%." If the freeness is >85°SR, it is considered "over-freezing," and a control strategy set is generated, including "reducing the frequency converter frequency by 3~8Hz" and "increasing the electromagnetic flow valve opening by 3%~5%."

[0073] Edge computing cabinet module: Provides computing power support for data preprocessing module and deviation analysis module: When the freeness is within the target range but the fiber buffing rate does not meet the standard, it triggers dynamic threshold adjustment to fine-tune the target freeness range to 68°SR~82°SR.

[0074] The data control module includes a PLC controller, which regulates the variable frequency drive (VFD) and electromagnetic flow valve of the pulping machine. The control module serves as the system's "execution command output terminal," and its functions are as follows: receiving the control strategy set transmitted from the data analysis module, selecting the optimal control scheme based on built-in priority rules (priority: speed adjustment > flow adjustment); converting the control scheme into standardized control commands, and outputting them to the VFD and electromagnetic flow valve of the pulping module. The control module determines the effectiveness of the adjustment strategy as follows: after the VFD and electromagnetic flow valve execute the standardized control commands, the actual output frequency of the VFD and the actual opening degree of the electromagnetic flow valve are calculated against the command parameters output by the control module. If the deviation is less than 2%, the dynamic parameter adjustment is considered effective; if the deviation is greater than 2%, the control module regenerates fine-tuning commands until the deviation is less than 2%.

[0075] This embodiment provides a method for using the above-mentioned control system, including the following steps;

[0076] Step 1: Setting Target Pulping Parameters: Based on the performance requirements of the substrate paper to be produced, set the following parameters in the target parameter database of the data analysis module:

[0077] (1) Target parameters for freeness: 65°SR~85°SR (center value 75°SR); (2) Target parameters for fiber morphology: average length ≥1.2mm, fibrillation index ≥0.4; (3) Target parameters for pulping process: pressure 0.5~0.8MPa, concentration 3%~5%; (4) Control response threshold: when the freeness deviation is >2°SR or the fiber fibrillation rate deviation is >0.05, dynamic adjustment is triggered, and the above parameters are entered into the target parameter database of the deviation analysis module as the benchmark for subsequent monitoring and control;

[0078] Step 2: Real-time Data Acquisition and Monitoring: After the system is started, the sensors in the pulping module begin to work: the pressure sensor and concentration sensor at the pulp inlet collect pulp pressure and concentration data every 500ms; the online percussion instrument in the pulping chamber collects freeness data every 500ms; the fiber morphology detector captures 30 frames of fiber images every 500ms and outputs morphology parameters; the speed sensor collects rotor speed every 500ms; the data acquisition card summarizes all the detection data and transmits it to the data analysis module.

[0079] Step 3: Data Analysis and Status Judgment: After receiving the data, the data analysis module performs the following operations: Data Preprocessing: Based on the standard pulp sample (known freeness 75°SR, concentration 4%), the real-time data of the online percussion instrument and concentration sensor are calibrated, and characteristic values ​​such as the mean freeness and standard deviation of fiber fibrillation rate are extracted. The preprocessed parameters are compared with the target parameters to select the set of control strategies.

[0080] Step 4: Dynamic parameter adjustment: After receiving the control strategy set from the data analysis module, the control module prioritizes speed adjustment based on the priority filtering principle;

[0081] Step 5: Closed-loop feedback control: Repeat steps 2 to 4 to form closed-loop control: If "process is normal" is determined in step 3, the current control command is maintained and parameter changes are continuously monitored; if "process is abnormal" is determined in step 3, the dynamic adjustment in step 4 is repeated until parameters such as freeness and fiber morphology return to the target range.

[0082] Comparative Example

[0083] This comparative example provides a control system for optimizing the freeness of flat base paper, including: a pulp inlet, a pulping chamber, and a pulper;

[0084] The pulp inlet is equipped with a pressure sensor and a concentration sensor; the pressure sensor is used to collect the conveying pressure of the pulp at the pulp inlet; the concentration sensor is used to monitor the concentration of the pulp entering the inlet.

[0085] The beating chamber includes an online percussion instrument and a speed sensor; the online percussion instrument is used to detect the pulp consistency inside the beating chamber in real time; the speed sensor is used to monitor the real-time rotational speed of the rotor inside the beating chamber and to provide feedback on the intensity of the beating mechanical action.

[0086] The pulper includes a frequency converter and an electromagnetic flow valve; the frequency converter is used to adjust the rotor speed of the pulper and change the shear and abrasion intensity of the pulp; the electromagnetic flow valve is used to regulate the flow rate of pulp entering the pulping chamber and match the speed adjustment to maintain a stable pulping time.

[0087] Test Example 1

[0088] In order to evaluate the control effect of the above-mentioned system provided in this application on the pulping process, this test case evaluates and synthesizes the systems provided in the embodiments and comparative examples based on the indicators in Table 1. The test results are shown in Table 1.

[0089] Table 1. Comparison of the effects and performance of pulping parameter control under different pulping control systems

[0090]

[0091] The above are merely preferred embodiments of this application and are not intended to limit the present invention. Although this application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control system for optimizing the freeness of flat base paper, characterized in that, include: Pulping module, data analysis module, control module; The pulping module includes a pulp inlet, a pulping chamber, a pulping machine, and a data acquisition card; The pulp inlet is equipped with a pressure sensor and a concentration sensor. The pressure sensor is used to collect the conveying pressure of the pulp at the pulp inlet in real time, and the concentration sensor is used to monitor the pulp concentration at the pulp inlet. The beating chamber includes an online percussion instrument, a fiber morphology detector, and a speed sensor. The online percussion instrument is used to detect the pulp consistency inside the beating chamber in real time. The fiber morphology detector is used to image the pulp in real time and output microscopic parameters such as the average length of pulp fibers and the fibrillation index. The speed sensor is used to monitor the real-time rotational speed of the rotor inside the beating chamber. The pulper is installed inside the pulping chamber and includes a frequency converter and an electromagnetic flow valve. The frequency converter is used to receive instructions from the control module to adjust the rotor speed of the pulper, and the electromagnetic flow valve is used to regulate the flow rate of pulp entering the pulping chamber. One end of the data acquisition card is connected to the pressure sensor and concentration sensor at the pulp inlet, as well as the online percussion instrument, fiber morphology detector, and speed sensor in the pulping chamber via a signal cable. The other end is connected to the data analysis module via a communication method to realize the real-time acquisition and transmission of detection data. The data analysis module is used to receive detection data transmitted by the data acquisition card. The data analysis module includes a data preprocessing module and a deviation analysis module. The control module is used to regulate the frequency converter and electromagnetic flow valve of the pulping machine.

2. The control system for optimizing the beating degree of flat base paper according to claim 1, characterized in that, The data preprocessing module is used to receive data transmitted by the data acquisition card, and output standardized real-time data after performing data calibration and feature extraction operations in sequence.

3. The control system for optimizing the beating degree of flat base paper according to claim 1, characterized in that, The deviation analysis module has a built-in target parameter database. The deviation analysis module is used to compare the real-time data with the parameters in the target parameter database and issue the following instructions: If the freeness is between 65°SR and 85°SR and the fiber fibrillation rate is greater than or equal to 0.4, the process is considered normal, and an instruction to maintain the current parameters is generated. If the beating degree is less than 65°SR or the fiber fibrillation rate is greater than 0.4, it is determined to be insufficient beating. Then, the beating degree deviation value is calculated to generate a set of control strategies to increase the frequency of the variable frequency drive and / or reduce the opening of the electromagnetic flow valve. If the beating degree is greater than 85°SR, it is determined to be over-beating. Then, the beating degree deviation value is calculated to generate a set of control strategies to reduce the frequency of the variable frequency drive and / or increase the opening of the electromagnetic flow valve.

4. The control system for optimizing the beating degree of flat base paper according to claim 1, characterized in that, The data analysis module includes an edge computing enclosure module; The edge computing cabinet module provides computing power support for the data preprocessing module and the deviation analysis module: when the deviation analysis module detects that the beating degree is within the preset target parameter range, but the fiber buffing rate has not reached the target value, the edge computing cabinet module automatically triggers a dynamic threshold adjustment mechanism to narrow the target parameter range of the beating degree.

5. The control system for optimizing the beating degree of flat base paper according to claim 1, characterized in that, The control module has built-in priority rules, which are ordered as follows: speed adjustment, flow rate adjustment; After receiving the set of control strategies transmitted by the data analysis module, the control module selects a suitable control scheme from the set of control strategies based on the priority rules, and converts the control scheme into standardized control commands and outputs them to the frequency converter and electromagnetic flow valve in the pulping module to achieve precise control of the operating parameters of the pulping module.

6. A method of using the control system for optimizing the freeness of flat base paper according to any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Set the target range of freeness, target parameters of fiber morphology, and control response threshold in the target parameter database of the deviation analysis module; Step 2: Start the system. The pulping module detects data at a preset detection frequency, and the data acquisition card transmits the detected data to the data analysis module. Step 3: After receiving the detection data, the data analysis module calibrates the detection data to extract the mean freeness and the standard deviation of fiber fibrillation rate. The mean freeness and the standard deviation of fiber fibrillation rate are compared with the target parameters to select a set of control strategies. Step 4: The control module receives the control strategy set transmitted by the data analysis module, converts the control strategy set into a corresponding signal and outputs it to the pulping machine of the pulping module, and verifies the effectiveness of the control strategy set through the detection data of the pulping chamber. Step 5: Repeat steps 2 to 4 until the detection data is within the target parameter range.

7. The method of using the control system for optimizing the beating degree of flat base paper according to claim 6, characterized in that: The pressure sensor and concentration sensor at the pulp inlet, as well as the online percussion instrument, fiber morphology detector, and speed sensor in the pulping chamber, all operate synchronously with a data acquisition interval of 500ms.

8. The method of using the control system for optimizing the beating degree of flat base paper according to claim 6, characterized in that: The standard for the control module to determine whether the adjustment strategy is effective is as follows: after the variable frequency drive and the electromagnetic flow valve execute the standardized control command, the actual output frequency of the variable frequency drive and the actual opening degree of the electromagnetic flow valve are calculated with the command parameters output by the control module. When the deviation is less than 2%, the dynamic parameter adjustment is determined to be effective; if the deviation is greater than 2%, the control module regenerates the fine-tuning command until the deviation is less than 2%.

9. The application of the control system for optimizing the freeness of flat base paper according to any one of claims 1 to 5, characterized in that, Application in pulping control of flat paper.

10. A papermaking system, characterized in that, The control system for optimizing the beating degree of flat base paper as described in any one of claims 1 to 5, or the method of using the control system for optimizing the beating degree of flat base paper as described in any one of claims 6 to 8.

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