Cathode and anode pressure monitoring system for fluorine-making electrolytic cell

Abstract

The utility model discloses a pressure monitoring system for a cathode and an anode of a fluorine-making electrolytic bath, which is characterized in that the cathode and the anode of the electrolytic bath are respectively provided with a U-shaped tube pressure gauge, and the U-shaped tube pressure gauges of the electrolytic bath are arranged on the same display panel; the camera is connected to the electrolytic bath through the image recognition processor, the U-shaped pipe pressure display, the pressure alarm, the electrolytic bath rectifier and the water ring vacuum pump in sequence, an anode gas outlet pipe of each electrolytic bath is connected to an anode gas outlet header pipe in parallel to be connected to the water ring vacuum pump, and the anode gas outlet header pipe is provided with an anode header pipe U-shaped pipe pressure gauge; the man-machine interaction display screen is respectively connected with the U-shaped pipe pressure display, the electrolytic bath rectifier and the water ring vacuum pump, and the man-machine interaction display screen is provided with a man-machine interaction system; the camera is erected at the position where information of a display panel of the U-shaped pipe pressure gauge can be collected. The system monitors the liquid level pressure of the electrolytic bath in real time based on a machine vision technology and performs data processing to judge whether the pressure of the cathode and the anode is in a safe state or not.

Description

Technical Field

[0001] The utility model relates to a monitoring system for the anode and cathode pressures of a fluorine-producing electrolytic cell, in particular to a monitoring system for the anode and cathode pressures of a fluorine-producing electrolytic cell based on machine vision technology. Background Art

[0002] During the electrolytic fluorine production process, the liquid level of the electrolytic cell must be controlled. The liquid level of the electrolytic cell is related to the pressure in the anode and cathode chambers during electrolysis. If the pressure fluctuations in the cell are large and not detected in time, it will cause large fluctuations in the cell liquid level, and even cause cross-talk between the anode and cathode gases, leading to the electrolytic cell explosion and safety accidents. Therefore, it is extremely important to timely and accurately reflect the pressure of the anode and cathode of the fluorine production electrolytic cell.

[0003] A U-tube manometer consists of a U-shaped glass or plexiglass tube filled with liquid (such as water, mercury, or alcohol) fixed to a plate with a graduated scale. It can measure positive, negative, and differential pressures less than 0.1 MPa. Its operating principle is as follows: Before the U-tube manometer is connected to a pressure measuring point, the liquid levels on both sides of the gauge are level at the zero scale line. When one end of the U-tube manometer is connected to the pressure measuring point, the liquid level inside the gauge changes. If the liquid level on the side connected to the pressure measuring point drops, the pressure at that point is positive; if it drops, the pressure at that point is negative.

[0004] During electrolytic fluorine production, the pressures in the anode and cathode chambers of the electrolytic cell are extremely low. Furthermore, the electrolyte in the cell contains corrosive gases, which can easily corrode micro-differential pressure gauges. Therefore, conventional micro-differential pressure transmitters or pressure measuring instruments are difficult to use for long periods of time and cannot accurately and timely measure the pressures in the anode and cathode chambers. U-tube manometers, due to their simple structure and intuitive readings, can be used to measure negative, positive, and differential pressures, and are widely used in industrial production processes. Therefore, a common pressure monitoring method in the electrolytic fluorine production industry is to use water as the medium to measure and monitor the positive, differential, and negative pressures (i.e., the vacuum level) in the anode and cathode chambers of the electrolytic cell using the U-tube manometer's liquid level difference to measure and monitor the positive, differential, and negative pressures (i.e., the vacuum level) in the anode and cathode chambers of the electrolytic cell.

[0005] In existing fluorine production processes, each electrolytic fluorine production line has dozens of electrolytic cells, each equipped with two U-tube pressure gauges for the cathode and anode. The number of U-tube pressure gauges is twice the number of cells. Therefore, the existing electrolytic fluorine production process has the following shortcomings:

[0006] (1) There are many U-tube pressure gauges, and it takes a long time to monitor the pressure. Operators may easily suffer from visual fatigue and fatigue after high concentration if they observe for a long time, and they may fail to detect abnormal pressure of cathode and anode in time.

[0007] It is impossible to judge in time whether the current production is in a safe and reasonable state, which brings safety hazards to the monitoring of the anode and cathode pressure of the electrolytic cell and the control of the process system.

[0008] The liquid level change of the U-tube pressure gauge is manually observed and cannot display the specific pressure value or the height change value of the water in the U-tube, and cannot realize the automatic control of the production process. Summary of the Invention

[0009] The purpose of the utility model is to provide a fluorine-producing electrolytic cell anode and cathode pressure monitoring system, which uses machine vision technology to monitor the liquid level of the electrolytic cell U-tube pressure gauge in real time and perform data processing, and provide real-time feedback on the pressure measurement results to determine whether the anode and cathode pressures of the electrolytic cell are in a safe state.

[0010] To achieve the above-mentioned purpose, the technical solution of this patent is: a fluorine-producing electrolytic cell anode and cathode pressure monitoring system, the cathode and anode of the electrolytic cell are respectively equipped with U-tube pressure gauges, and the U-tube pressure gauges of each electrolytic cell are placed on the same display panel; the camera is connected to the electrolytic cell in sequence through the image recognition processor-U-tube pressure display-pressure alarm-cell rectifier-water ring vacuum pump, and the anode gas outlet pipe of each electrolytic cell is connected in parallel to the anode gas outlet main pipe and connected to the water ring vacuum pump, and the anode gas outlet main pipe is equipped with an anode main pipe U-tube pressure gauge; the human-computer interaction display screen is respectively connected to the U-tube pressure display, the cell rectifier, and the water ring vacuum pump, and the human-computer interaction display screen is equipped with a human-computer interaction system; the camera is set up at a position where it can collect information from the U-tube pressure gauge display panel.

[0011] The camera is preferably an industrial-grade high-definition digital camera, and can be one or more cameras.

[0012] U-tube pressure display and pressure alarm system can display pressure and other related data, and provide over-limit warning or alarm functions.

[0013] The human-computer interaction system realizes the regulation function of the battery rectifier and water ring vacuum pump.

[0014] The image recognition processor has the following functions: (1) by comparing the image information collected by the camera, obtaining the liquid column height difference information, establishing a mathematical model between the liquid column height difference and pressure in the U-shaped tube, and adjusting the corresponding process parameters according to the output results of the mathematical model, thereby realizing the measurement and control of the cathode and anode pressure of the electrolytic cell. (2) according to the collected image recognition and positioning, the number corresponding to each U-shaped tube in the pressure gauge panel image is detected, and the liquid column height difference in each U-shaped tube is detected and converted into a pressure signal value.

[0015] The image recognition processor includes a liquid column height difference image acquisition module, a liquid column height difference image processing module, and a U-tube liquid level height difference pressure conversion calculation module. The liquid column height difference image acquisition module can capture images based on environmental changes such as the degree of video distortion and lighting changes, and has functions such as good color reproduction and clear imaging. The liquid column height difference image processing module has the function of identifying and locating the number corresponding to each U-tube in the pressure gauge panel image, and can detect the liquid column height difference within each U-tube in the pressure gauge panel image. The U-tube liquid level height difference pressure conversion calculation module has the function of converting the liquid column height difference image into a pressure difference signal value.

[0016] The function of the U-tube pressure display is to display the pressure signal value converted from the height difference of the liquid column in each U-tube identified and processed by the image recognition processor.

[0017] The function of the pressure alarm is to monitor the pressure signal value displayed by the U-tube pressure display and issue an alarm when the pressure inside the electrolytic cell reaches the set limit. In other words, when the pressure difference between the cathode and anode of the automatic monitoring exceeds a certain value, the alarm is activated to alert the operator.

[0018] The U-tube pressure display and pressure alarm can not only display the real-time collected pressure gauge display panel image, the pressure difference after the liquid level height difference is converted, and the set pressure change threshold, but also has the functions of viewing, setting, deleting, and communicating.

[0019] The anode and cathode pressure monitoring system of the fluorine-producing electrolytic cell can also interlock the U-tube pressure display with the electrolytic cell rectifier and the water ring vacuum pump, and adjust the current value of the rectifier by raising or lowering or shutting down the human-computer interaction system to realize the function of controlling the rectifier of the corresponding electrolytic cell, and adjust the anode and cathode pressure of the electrolytic cell by adjusting the frequency converter of the water ring vacuum pump.

[0020] The working process of the anode and cathode pressure monitoring system of the fluorine-producing electrolytic cell is as follows: the liquid column height difference image of the U-tube pressure gauge on the display panel of the U-tube pressure gauge is collected in real time by a camera, and the collected liquid column height difference image is transmitted to the image recognition processor; the liquid column height difference image of the U-tube is compared by the image recognition processor, and the liquid column height difference signal is converted into a pressure signal value and displayed on the U-tube pressure display; the U-tube pressure display determines whether the pressure exceeds the limit or alarms according to the set threshold value, and shuts down or adjusts the cell rectifier according to the judgment result; according to the threshold judgment result of the data displayed on the U-tube pressure display, the operator judges The human-computer interaction system adjusts the current of the electrolytic cell rectifier and adjusts the frequency of the frequency converter of the water ring vacuum pump according to the pressure of the anode gas outlet main pipe; when the outlet main pipe pressure is positive, the frequency of the water ring vacuum pump is increased to increase the delivery pressure of the anode gas, so that the positive pressure state of the outlet main pipe is gradually reduced to no pressure difference or a slightly negative pressure state; when the outlet main pipe pressure is negative, the frequency of the water ring vacuum pump is lowered to reduce the delivery pressure of the anode gas, so that the positive pressure state of the outlet main pipe is gradually restored to no pressure difference or a slightly negative pressure state. By adjusting the delivery pressure of the anode gas of the electrolytic cell in the above manner, the anode / cathode pressure of the electrolytic cell can be adjusted.

[0021] Each electrolytic cell corresponds to a liquid column height difference image. Each liquid column height difference image is converted into a pressure signal number, which is displayed on the U-tube pressure display system. The U-tube pressure display has a threshold value equal to the number of electrolytic cells. If any pressure signal exceeds the threshold, the system will alarm, prompting the operator to find the cause and deal with the electrolytic cell with abnormal pressure. Regardless of whether the pressure of a single electrolytic cell is normal or abnormal, when adjusting the inverter, the main pipe pressure is adjusted, that is, the pressure of all electrolytic cells is adjusted simultaneously.

[0022] The beneficial effects of this patent are: (1) combining machine vision processing technology with automated control technology to achieve measurement, monitoring, and control of the cathode and anode pressures of a fluorine production electrolytic cell based on a visual processing system. (2) The monitoring system of the present invention adopts fully automated intelligent control, which has the advantages of sensitive response, high degree of automation, and reduced labor costs. (3) It solves the problem in the prior art that operators need to keep an eye on a large number of U-shaped tubes for a long time, which is time-consuming. Operators are prone to visual fatigue and fatigue after high mental concentration after long-term observation, and are prone to not being able to detect abnormalities in the cathode and anode pressures in time; (4) It realizes the interlocking and automated control of the cathode and anode pressures with the process system control, quickly measures the cathode and anode pressures of the electrolytic cell, and determines whether the cathode and anode pressure control of the electrolytic cell is in a safe state. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the anode and cathode pressure monitoring system of the fluorine electrolysis cell according to the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and examples.

[0025] Example

[0026] like Figure 1 The system illustrates a fluorine production electrolytic cell anode and cathode pressure monitoring system. The cathode and anode electrodes of each electrolytic cell are each equipped with a U-tube pressure gauge, each mounted on a common display panel. A camera is connected to the electrolytic cell via an image recognition processor, a U-tube pressure display, a pressure alarm, a cell rectifier, and a water ring vacuum pump. The anode gas outlet pipe of each electrolytic cell is connected in parallel to the anode gas outlet manifold, which is then connected to the water ring vacuum pump. The anode gas outlet manifold is equipped with a U-tube pressure gauge. A human-computer interaction display is connected to the U-tube pressure display, the cell rectifier, and the water ring vacuum pump. The display is equipped with a human-computer interaction system, and the camera is positioned to capture information from the U-tube pressure gauge display panel. The camera is preferably an industrial-grade high-definition digital camera, and one or more cameras are possible. The U-tube pressure display and pressure alarm display pressure and other related data, as well as over-limit warnings and alarms. The U-tube pressure display is interlocked with the electrolytic cell rectifier and water ring vacuum pump, and the human-computer interaction system regulates the cell rectifier and water ring vacuum pump.

[0027] The anode and cathode pressure monitoring system of the fluorine production electrolyzer is implemented according to the following steps:

[0028] 1. Equipment installation: The industrial HD camera is installed in front of the U-tube pressure gauge panel. In order to ensure measurement accuracy, the industrial HD camera is set up directly opposite the U-tube pressure gauge panel.

[0029] 2. Image Acquisition: It is best to set the background color of the U-tube manometer to have a large contrast with the color of the water column within the U-tube manometer. Generally, white is used for the background board, and red is the preferred color for the liquid within the U-tube. A high-speed camera captures the height difference of the liquid column within the U-tube manometer on the manometer display panel in real time, records the height difference, and transmits the captured image to the image recognition and processing system.

[0030] 3. Image recognition processing: The image recognition processor identifies and locates the number corresponding to each U-shaped tube in the image of the pressure gauge panel; the image recognition processor compares the liquid column height difference image of the U-shaped tube, converts the liquid column height difference image of the U-shaped tube into a corresponding pressure display signal, and transmits the calculated pressure numerical signal of the U-shaped tube pressure gauge to the U-shaped tube pressure display.

[0031] The U-tube manometer's liquid column height difference thresholds are divided into positive and negative values. A slightly positive pressure anomaly occurs when a positive value exceeds the positive threshold; a slightly negative pressure anomaly occurs when a negative value exceeds the negative threshold. When the test result indicates a positive pressure difference, the pressure difference height diagram is displayed in one color; when the pressure difference is negative, the pressure difference height diagram is displayed in another color. This facilitates the display of positive and negative liquid height phenomena, i.e., positive and negative pressure. Overpressure is displayed in a warning color, and the program stores the alarm record and the image at the time of the alarm in the database.

[0032] 4. System Control: The U-tube pressure display compares the converted pressure value with the set threshold to determine whether it exceeds the limit and issues an alarm, notifying the operator when an abnormality reaches the set limit. The operator uses the human-computer interaction system to interlock the electrolytic cell rectifier and water ring vacuum pump, controlling the cathode and anode pressures of the electrolytic cell by adjusting the current of the electrolytic cell rectifier and the frequency of the water ring vacuum pump's inverter.

[0033] During the U-tube pressure monitoring and control process, the image recognition processor detects the U-tube and triggers an alarm when the pressure differential exceeds a specified threshold and persists for a specified time. The alarm clears when the pressure differential falls below the threshold and persists for a specified time. The alarm information module primarily displays all detection alarms that occurred for the device in various scenarios within the recently set time period. Alarm information includes the alarm time, alarm U-tube number, and the pressure differential value at the time of the alarm.

[0034] Table 1 shows the pressure data of the cathode and anode of the fluorine-producing cell monitored by the monitoring system of this patent, and Table 2 shows the pressure monitoring data of the cathode and anode of the fluorine-producing cell after the frequency converter of the water ring vacuum pump is adjusted.

[0035] Table 1. Cathode and anode pressure data of fluorine production cell

[0036]

[0037] Table 2 Monitoring data of cathode and anode pressure of fluorine production cell after adjusting the frequency converter of water ring vacuum pump

[0038]

[0039] The data in Table 1 clearly shows that the anode pressure of electrolytic cell No. 4 is +350 Pa, exceeding the threshold of 300 Pa. The pressure monitoring system will trigger an alarm for that cell's pressure, with the alarm message "4+," where "4" represents cell No. 4 and "+" represents the anode pressure. This cell's anode pressure of 350 Pa indicates a positive anode pressure, indicating a blockage. Meanwhile, the anode pressures of electrolytic cells 1, 2, ..., and n are all around -200 Pa, with the "-" indicating a negative anode pressure of 200 Pa for the entire electrolysis system, which is significant.

[0040] Table 2 shows that reducing the frequency of the inverter from 80Hz to 65Hz reduced the water ring vacuum pump's exhaust volume, which in turn reduced the anode pressure of the fluorine-producing cell. This reduced the overall pressure of the fluorine-producing cell from -200Pa to -80Pa, effectively controlling the anode and cathode pressures of the electrolytic cells. Simultaneously, by addressing the anode blockage in electrolytic cell No. 4, the pressure in that cell returned to normal, eliminating the abnormal pressure alarm.

[0041] By adjusting the frequency of the inverter, the negative pressure at the electrolytic cell anode gradually decreases, and the system pressure gradually approaches a zero pressure differential state. As the negative pressure at the electrolytic cell anode decreases, ambient air, caused by problems such as poor electrolytic cell sealing, is drawn into the anode system. This gradually reduces the high air content at the fluorine production anode, making the fluorine production electrolysis process more stable.

[0042] The pressure display described in this patent can display the real-time collected pressure gauge display panel image, the pressure difference after the liquid level height difference is converted, the set pressure change threshold and other functions. It can also turn off and on the control system and image recognition processing system, and has the functions of detection, viewing, setting, deletion, communication and so on. Among them, users with different permissions can operate different functional modules. The parameter setting module and user management module for ordinary users are invisible, the algorithm parameter setting module for management personnel is invisible, and all modules for developers are visible.

[0043] In summary, the technical solution of the present invention is as follows: a high-definition camera is arranged opposite to the U-tube pressure gauge display panel, and the high-definition camera collects the liquid column height difference image in the U-tube pressure gauge on the pressure gauge display panel in real time, and transmits the collected liquid column height difference image to the image recognition and processing system; the U-tube pressure display and pressure alarm are used to intuitively display, alarm and control the anode and cathode pressures of the electrolytic cell, thereby solving the problem of operators observing the U-tube pressure gauge for a long time and suffering visual fatigue, timely discovering abnormal phenomena of the anode and cathode pressures and accurately controlling the pressures of the anode and cathode chambers of the electrolytic cell, improving the electrolysis efficiency and the amount of electrolyte, and realizing the monitoring of the anode and cathode pressures of the electrolytic cell and the automatic control of the process based on the visual system.

Claims

1. A fluorine production electrolytic cell anode and cathode pressure monitoring system, characterized by: The cathode and anode of the electrolytic cell are respectively equipped with U-tube pressure gauges, and the U-tube pressure gauges of each electrolytic cell are placed on the same display panel; the camera is connected to the electrolytic cell in sequence through the image recognition processor-U-tube pressure display-pressure alarm-cell rectifier-water ring vacuum pump, and the anode gas outlet pipe of each electrolytic cell is connected in parallel to the anode gas outlet main pipe and connected to the water ring vacuum pump, and the anode gas outlet main pipe is equipped with an anode main pipe U-tube pressure gauge; the human-computer interaction display screen is respectively connected to the U-tube pressure display, cell rectifier, and water ring vacuum pump, and the human-computer interaction display screen is equipped with a human-computer interaction system; the camera is set up at a position where it can collect information from the U-tube pressure gauge display panel.

2. The anode and cathode pressure monitoring system for a fluorine production electrolytic cell according to claim 1 is characterized in that: The camera is an industrial-grade high-definition digital camera.

3. The anode and cathode pressure monitoring system for a fluorine production electrolytic cell according to claim 1, characterized in that: There are two or more cameras.

4. The anode and cathode pressure monitoring system for a fluorine production electrolytic cell according to claim 1, characterized in that: The image recognition processor includes a liquid column height difference image acquisition module, a liquid column height difference image processing module, and a calculation module for converting the U-shaped tube liquid level height difference into pressure.

5. The anode and cathode pressure monitoring system for a fluorine production electrolytic cell according to claim 1 is characterized in that: The U-tube pressure display is interlocked with the electrolytic cell rectifier and the water ring vacuum pump.

6. The anode and cathode pressure monitoring system for a fluorine production electrolytic cell according to claim 1, characterized in that: The camera collects the liquid column height difference image of the U-tube pressure gauge on the display panel of the U-tube pressure gauge in real time, and transmits the collected liquid column height difference image to the image recognition processor; the image recognition processor compares the liquid column height difference image of the U-tube, converts the liquid column height difference signal into a pressure signal value and displays it on the U-tube pressure display. The U-tube pressure display determines whether an over-limit warning or alarm is issued based on the set threshold, and shuts down or adjusts the cell rectifier based on the judgment result; based on the threshold judgment result of the data displayed on the U-tube pressure display, the operator adjusts the current of the cell rectifier up and down through the human-computer interaction system, and adjusts the frequency of the water ring vacuum pump inverter according to the pressure of the anode gas outlet main pipe.

7. The anode and cathode pressure monitoring system for a fluorine production electrolytic cell according to claim 6, characterized in that: Each electrolytic cell corresponds to a liquid column height difference image. Each liquid column height difference image is converted into a pressure signal number, and a signal is displayed on the U-tube pressure display. The U-tube pressure display is set with the same number of thresholds as the electrolytic cells. As long as one pressure signal number exceeds the threshold, the system will alarm.

8. The anode and cathode pressure monitoring system for a fluorine production electrolytic cell according to claim 6, characterized in that: The liquid column height difference threshold of the U-tube pressure gauge is divided into positive and negative values.

9. The anode and cathode pressure monitoring system for a fluorine production electrolytic cell according to claim 6, characterized in that: When the outlet main pipe pressure is positive, increase the frequency of the water ring pump to increase the delivery pressure of the anode gas, so that the positive pressure state of the outlet main pipe is gradually reduced to a flat pressure or slightly negative pressure state; when the outlet main pipe pressure is negative, lower the frequency of the water ring pump to reduce the delivery pressure of the anode gas, so that the positive pressure state of the outlet main pipe is gradually restored to a flat pressure or slightly negative pressure state.

10. The anode and cathode pressure monitoring system for a fluorine production electrolytic cell according to claim 6, characterized in that: When adjusting the inverter, the pressure of all electrolytic cells is adjusted at the same time.

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