Electrodialysis membrane stack wetting system and method

Abstract

The application provides a kind of electrodialysis membrane stack film system and method.The application is controlled unit by programmable logic controller (PLC), for sending pre-check signal to monitoring and adjusting unit;Receive the pre-check qualified signal fed back by monitoring and adjusting unit, and send valve opening signal and pump starting signal to power and transmission unit in turn;Monitoring and adjusting unit, for obtaining three branch liquid level sensor signals and maintenance liquid conductivity sensor signals based on pre-check signal, respectively, to generate pre-check qualified signal;Power and transmission unit, for receiving valve opening signal and pump starting signal, to open the corresponding membrane stack valve and pump of each road of fresh water road, concentrated water road and polar water road in turn;Electrodialysis membrane stack, for receiving the maintenance liquid circulated by power and transmission unit to carry out membrane wetting maintenance.In this way, the application can realize automatic control of the whole process through PLC, realize intelligent and autonomous pre-check and circulating membrane wetting of three liquid levels, without manual repeated inspection, and can adapt to various application scenarios.

Description

Technical Field

[0001] This application relates to the field of electrodialysis membrane stack technology, and more particularly to an electrodialysis membrane stack wetting system and method. Background Technology

[0002] Currently, most membrane lubrication and maintenance techniques for electrodialysis membrane stacks rely on manual operation. However, manual operation depends heavily on experience, lacks standardized procedures, and is prone to errors. Furthermore, the manual disassembly and soaking process, along with the manual start-up and shutdown of valves and pumps, is inefficient and can lead to safety accidents and significant losses due to uneven force or incorrect start-up / shutdown sequences. In summary, existing electrodialysis membrane stack lubrication methods offer low precision, efficiency, and safety, making them unsuitable for various application scenarios. Summary of the Invention

[0003] This application provides an electrodialysis membrane wetting system and method to address, to some extent, the problems of low accuracy, efficiency, and safety of existing electrodialysis membrane wetting systems, which make them difficult to adapt to various application scenarios.

[0004] According to one aspect of this application, an electrodialysis membrane wetting system is provided. The system includes: a programmable logic controller (PLC) control unit, configured to send a pre-detection signal to a monitoring and control unit when the electrodialysis membrane wetting system enters a standby state and reaches a preset start-up time interval or detects a start-up button signal; receive a pre-detection pass signal from the monitoring and control unit; and based on the pre-detection pass signal, sequentially send a valve opening signal and a pump start signal to a power and transmission unit; and a monitoring and control unit, configured to receive the pre-detection signal sent by the PLC control unit, and based on the pre-detection signal, acquire the liquid level sensor signals of three branches respectively. The system generates a pre-inspection pass signal based on the liquid level sensor signals and the maintenance solution conductivity sensor signals from the three branches. The three branches include: a desalination line, a concentrate line, and an electrode water line. The power and transmission unit receives valve opening signals from the PLC control unit and sequentially opens the corresponding membrane stack valves in the desalination line, concentrate line, and electrode water line. It also receives pump start signals from the PLC control unit and sequentially starts the desalination pump, concentrate pump, and electrode water pump, so that the maintenance solution is circulated and transported to the electrodialysis membrane stack along the three branches. The electrodialysis membrane stack receives the maintenance solution circulated by the power and transmission unit for membrane lubrication and maintenance.

[0005] Furthermore, according to one aspect of the system of this application, when the electrodialysis membrane stack wetted membrane system enters a standby state, and the PLC control unit detects that a preset start-up time interval has been reached or detects a start button signal when the user presses the start button, the PLC control unit generates a pre-detection signal and sends it to the monitoring and adjustment unit; the standby state is used to indicate that the electrodialysis membrane stack is in a non-working standby state.

[0006] Furthermore, according to one aspect of the system of this application, the PLC control unit is also used to: receive flow sensor signals, temperature sensor signals and pressure sensor signals from three branches fed back by the monitoring and regulation unit; and send a pump stop signal and a valve close signal to the power and transmission unit when any one or more of the flow sensor signals, temperature sensor signals and pressure sensor signals from the three branches fail to meet the corresponding preset flow threshold, temperature threshold and pressure threshold.

[0007] Furthermore, according to one aspect of the system of this application, the monitoring and adjustment unit includes: a freshwater level sensor, a freshwater maintenance fluid conductivity sensor, a concentrated water level sensor, a concentrated water maintenance fluid conductivity sensor, an electrode water level sensor, and an electrode water maintenance fluid conductivity sensor; the monitoring and adjustment unit receives a pre-detection signal sent by the PLC control unit, and acquires the signals from the freshwater level sensor, the freshwater maintenance fluid conductivity sensor, the concentrated water level sensor, the concentrated water maintenance fluid conductivity sensor, the electrode water level sensor, and the electrode water maintenance fluid conductivity sensor, respectively; when the signals from the freshwater level sensor, the freshwater maintenance fluid conductivity sensor, the concentrated water level sensor, the concentrated water maintenance fluid conductivity sensor, and the electrode water level sensor, as well as the electrode water maintenance fluid conductivity sensor, all sequentially satisfy the freshwater level threshold and the freshwater level threshold, respectively. When the conductivity thresholds of the water supply line, the water level threshold, and the water supply line maintenance fluid threshold, as well as the water level threshold and the water supply line maintenance fluid threshold, are met, the monitoring and adjustment unit generates a pre-inspection qualified signal and sends it to the PLC control unit. When any one of the following fails to meet the corresponding water level threshold, water supply line maintenance fluid ...

[0008] Furthermore, according to one aspect of the system of this application, the monitoring and control unit further includes: a freshwater flow sensor, a freshwater temperature sensor, a freshwater pressure sensor, a concentrate flow sensor, a concentrate temperature sensor, a concentrate pressure sensor, an electrode flow sensor, an electrode temperature sensor, an electrode pressure sensor, a concentrate cooler, and an electrode cooler; the monitoring and control unit acquires signals from the freshwater flow sensor, the freshwater temperature sensor, the freshwater pressure sensor, the concentrate flow sensor, the concentrate temperature sensor, and the concentrate pressure sensor. The monitoring and adjustment unit receives signals from the polar water circuit flow sensor, polar water circuit temperature sensor, and polar water circuit pressure sensor, and sends them to the PLC control unit. Within a preset period, the monitoring and adjustment unit acquires the first temperature of the concentrate cooler and the second temperature of the polar water cooler, and sends the first and second temperatures to the PLC controller. The monitoring and adjustment unit receives start / stop commands for the concentrate cooler and the polar water cooler from the PLC controller. Based on the start / stop commands for the concentrate cooler and the polar water cooler, the monitoring and adjustment unit starts and stops the concentrate cooler and the polar water cooler respectively.

[0009] Furthermore, according to one aspect of the system of this application, the power and transmission unit includes: a freshwater inlet valve, a freshwater outlet valve, a concentrate inlet valve, a concentrate outlet valve, an electrode water inlet valve, and an electrode water outlet valve; the power and transmission unit receives a valve opening signal sent by the PLC control unit and opens the freshwater inlet valve and the freshwater outlet valve corresponding to the freshwater path; after a first delay, the power and transmission unit opens the concentrate inlet valve and the concentrate outlet valve corresponding to the concentrate path; after a second delay, the power and transmission unit opens the electrode water inlet valve and the electrode water outlet valve corresponding to the electrode water path; the first delay is less than the second delay.

[0010] Furthermore, according to one aspect of the system of this application, the power and transmission unit includes: a desalination pump, a concentrate pump, and an electrode water pump; the power and transmission unit receives a pump start signal sent by the PLC control unit, and based on the pump start signal, sequentially starts the desalination pump, concentrate pump, and electrode water pump in the order of desalination path, concentrate path, and electrode water path, so that the maintenance solution circulates through the electrodialysis membrane stack.

[0011] Furthermore, according to one aspect of the system of this application, when the membrane wetting and maintenance time reaches the preset membrane wetting time interval, or when any one or more of the flow sensor signals, temperature sensor signals, and pressure sensor signals of the three branches fail to meet the corresponding preset flow threshold, temperature threshold, and pressure threshold, the power and transmission unit receives a pump stop signal sent by the PLC control unit, and based on the pump stop signal, sequentially stops the operation of the freshwater pump, the concentrate pump, and the electrode water pump in the order of freshwater path, concentrate path, and electrode water path; after a third delay after the freshwater pump, concentrate pump, and electrode water pump stop, the power and transmission unit receives a valve close signal sent by the PLC control unit, and based on the valve close signal, sequentially closes the freshwater inlet and outlet valves of the freshwater path, the concentrate inlet and outlet valves of the concentrate path, and the electrode water inlet and outlet valves of the electrode water path.

[0012] In addition, according to one aspect of the system of this application, the system further includes: a lubrication control display panel, including: lubrication start and stop buttons, lubrication maintenance time interval and timing, lubrication start time interval and timing.

[0013] According to another aspect of this disclosure, a method for wetting an electrodialysis membrane is provided. The method includes: using a programmable logic controller (PLC) control unit to send a pre-detection signal to a monitoring and control unit when the electrodialysis membrane wetting system enters a standby state and a preset start-up time interval is reached or a start-up button signal is detected; receiving a pre-detection pass signal from the monitoring and control unit; and based on the pre-detection pass signal, sequentially sending a valve opening signal and a pump start signal to a power and transmission unit; using the monitoring and control unit to receive the pre-detection signal sent by the PLC control unit; and based on the pre-detection signal, acquiring the liquid level sensor signals of the three branches respectively. The system generates a pre-inspection pass signal based on the conductivity sensor signal of the maintenance solution and the level sensor signal of the maintenance solution in the three branches. The three branches include: a desalination line, a concentrate line, and an electrode water line. The system uses the power and transmission unit to receive the valve opening signal sent by the PLC control unit and sequentially opens the corresponding membrane stack valves in the desalination line, concentrate line, and electrode water line. The system also receives the pump start signal sent by the PLC control unit and sequentially starts the desalination pump, concentrate pump, and electrode water pump, so that the maintenance solution is circulated and transported to the electrodialysis membrane stack along the three branches. The electrodialysis membrane stack uses the maintenance solution circulated by the power and transmission unit to perform membrane lubrication and maintenance.

[0014] This application provides an electrodialysis membrane wetting system and method. The application utilizes a programmable logic controller (PLC) control unit to send a pre-check signal to a monitoring and control unit when the electrodialysis membrane wetting system enters standby mode and reaches a preset start-up time interval or detects a start button signal; receive a pre-check pass signal from the monitoring and control unit, and based on the pre-check pass signal, sequentially send valve opening signals and pump start signals to the power and transmission units; the monitoring and control unit receives the pre-check signal sent by the PLC control unit, and based on the pre-check signal, acquires the liquid level sensor signals and maintenance fluid conductivity sensor signals from the three branches respectively; The system generates a pre-inspection pass signal based on the liquid level sensor signals and the conductivity sensor signals of the maintenance solution in three branches. The three branches include: a desalination line, a concentrate line, and an electrode water line. A power and transmission unit receives valve opening signals from the PLC control unit and sequentially opens the corresponding membrane stack valves in each of the three lines. It also receives pump start signals from the PLC control unit and sequentially starts the desalination pump, concentrate pump, and electrode water pump, allowing the maintenance solution to circulate and be delivered to the electrodialysis membrane stack along the three branches. The electrodialysis membrane stack receives the maintenance solution circulated by the power and transmission unit for membrane wetting and maintenance. Compared to existing purely manual maintenance methods, this application achieves fully automated control via PLC, enabling intelligent autonomous pre-inspection and circulating membrane wetting of the three liquid levels without the need for manual verification and repeated inspections. A single button trigger is all it takes to automatically complete the entire standardized membrane wetting and maintenance process. It can also automatically run in a timed cycle, completely eliminating reliance on manual experience and tedious manual operation, truly achieving unmanned, intelligent, one-button maintenance. In summary, the technical solution provided in this application can improve the accuracy, efficiency and safety of electrodialysis membrane wetting, and can be adapted to various application scenarios.

[0015] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0016] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0017] Figure 1 A structural block diagram of an electrodialysis membrane wetting system provided in this application embodiment; Figure 2 A structural block diagram of another complete electrodialysis membrane wetting system provided in the embodiments of this application; Figure 3A flowchart illustrating a method for wetting an electrodialysis membrane is provided in this application embodiment; Figure 4 This is a schematic diagram of the operation page of the film-lubricating control display panel provided in an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application more apparent, exemplary embodiments according to this application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0019] Currently, most membrane lubrication and maintenance techniques for electrodialysis membrane stacks rely on manual operation. However, manual operation depends heavily on experience, lacks standardized procedures, and is prone to errors. Furthermore, the manual disassembly and soaking process, along with the manual start-up and shutdown of valves and pumps, is inefficient and can lead to safety accidents and significant losses due to uneven force or incorrect start-up / shutdown sequences. In summary, existing electrodialysis membrane stack lubrication methods offer low precision, efficiency, and safety, making them unsuitable for various application scenarios.

[0020] Therefore, to address the aforementioned issues, this disclosure provides an electrodialysis membrane wetting system. Compared to existing purely manual maintenance methods, this application enables fully automated control of the entire process via PLC, achieving intelligent autonomous pre-inspection and circulating membrane wetting for three liquid levels, eliminating the need for manual verification and repeated inspections. A single button trigger is all it takes to automatically complete the entire standardized membrane wetting and maintenance process, and it can also automatically run in a timed cycle, completely eliminating reliance on manual experience and tedious manual operation, truly achieving unmanned, intelligent, one-button maintenance. In summary, the technical solution provided by this application can improve the accuracy, efficiency, and safety of electrodialysis membrane wetting, and can adapt to various application scenarios.

[0021] First, this application provides an electrodialysis membrane stacking and wetting system. Figure 1 A structural block diagram of an electrodialysis membrane wetting system provided in this application embodiment is shown below. Figure 1 As shown, the electrodialysis membrane wetting system 100 includes: The programmable logic controller (PLC) control unit 101 is used to send a pre-inspection signal to the monitoring and regulation unit when the electrodialysis membrane wetting system enters the standby state and reaches the preset start-up time interval or detects the start button signal; receive the pre-inspection qualified signal fed back by the monitoring and regulation unit; and based on the pre-inspection qualified signal, send the valve opening signal and pump start signal to the power and transmission unit in sequence. The monitoring and adjustment unit 102 is used to receive the pre-inspection signal sent by the PLC control unit, and based on the pre-inspection signal, acquire the liquid level sensor signal and the maintenance fluid conductivity sensor signal of the three branches respectively; based on the liquid level sensor signal and the maintenance fluid conductivity sensor signal of the three branches, generate a pre-inspection qualified signal; the three branches include: fresh water path, concentrated water path and polar water path; The power and transmission unit 103 is used to receive the valve opening signal sent by the PLC control unit and sequentially open the corresponding membrane stack valves of the desalination line, concentrate line and electrode water line; and to receive the pump start signal sent by the PLC control unit and sequentially start the desalination pump, concentrate pump and electrode water pump so that the maintenance solution is circulated and transported to the electrodialysis membrane stack along the three branches. The electrodialysis membrane stack 104 is used to receive the maintenance solution circulated by the power and transmission unit for membrane lubrication and maintenance.

[0022] In this application, the Programmable Logic Controller (PLC) control unit 101 can be understood as the control core and computing center of the entire system. Its main functions are to receive user operation commands and feedback signals from various units, perform logical operations and timing control, and realize automated scheduling and safety protection of the film-lubricating process. Specifically, this includes triggering the film-lubricating program, generating pre-inspection commands, sending control signals such as valve opening / pump start / pump stop / valve closing, and recording operating data and abnormal alarms.

[0023] In this application, the monitoring and control unit 102 can be understood as the system's sensing and judgment execution end. Its main function is to collect key operating parameters from various channels and perform preprocessing and judgment, providing a reliable basis for the PLC control unit's decision-making. Specifically, this includes real-time monitoring of the liquid level and conductivity of the preservative solution in the freshwater, concentrated water, and electrode water channels; synchronously collecting operating condition data such as flow rate, temperature, and pressure before and after membrane wetting and during operation; and feeding this data back to the PLC system so that it can trigger at least one control action, such as pre-check, alarm, or liquid replenishment, based on parameter thresholds.

[0024] In this application, the power and transmission unit 103 can be understood as the system's actuator and fluid transport carrier. Its main function is to execute mechanical actions according to the instructions of the PLC control unit, driving the maintenance fluid to circulate within the system along a predetermined path. Specifically, this includes opening or closing branch valves and starting or stopping water pumps in a preset sequence to ensure the stable flow of the maintenance fluid through key equipment such as filters and membrane stacks, forming a closed-loop circulating membrane lubrication pathway.

[0025] In this application, the electrodialysis membrane stack 104 can be understood as the maintenance object and core functional carrier of this system. It primarily serves as the main body for membrane wetting and maintenance, providing a wetting environment and ion exchange space for the membrane sheets and spacers. Specifically, it receives the maintenance solution delivered by the power and transmission units, allowing the solution to flow through its internal desalination chamber, concentrate chamber, and electrode chamber, thereby achieving online wetting, anti-cracking, and anti-fouling maintenance of the membrane stack, maintaining stable membrane stack performance, and extending its service life.

[0026] To further clarify the principle of this electrodialysis membrane wetting process, Figure 2 This is a structural block diagram of another complete electrodialysis membrane wetting system provided for an embodiment of this application. From... Figure 2 It can be seen that: The symbols represent: 1-electrodialysis membrane stack; 2-freshwater tank; 3-concentrate water tank; 4-electrode water tank; 5 - Freshwater pump, 6 - Concentrate pump, 7 - Electrochemical pump; 8, 9, and 10 are the comprehensive monitoring points for flow rate / pressure / temperature in the freshwater, concentrate, and electrochemical paths, respectively; 11, 19, and 20 are the inlet valves for the freshwater, concentrate, and electrochemical paths, respectively; 14, 23, and 24 are the outlet / return valves for the corresponding branches, respectively; 12 and 13 are the concentrate and electrochemical coolers, respectively; 15, 16, and 17 are the freshwater, concentrate, and electrochemical filters, respectively; 18 - Product water valve; 21 is the connection point between the freshwater branch and the freshwater path. The connecting pipes between the inlet valves 11; 22, 25, and 26 are the connecting pipes from each branch to the membrane stack; 27 is the membrane wetting control display panel for human-machine interaction; 28 is the parameter display area; 29 is the membrane wetting mode indicator; 30 is the membrane wetting interval timer; 31 is the membrane wetting operation timer; 32 is the membrane wetting interval time setting input; 33 is the start button; 34 is the stop button; 35 is the interval time setting value indicator; 36 is the operation time display; 37 is the operation time setting value indicator.

[0027] Specifically, the system constructs a complete film-wetting cycle through three independent but logically coordinated branches: a freshwater path, a concentrated water path, and an electrode water path, including: Freshwater circuit: It consists of freshwater tank 2, freshwater pump 5, freshwater filter 15, freshwater inlet valve 11 and return water pipeline, and is responsible for delivering cleaning and maintenance solution to the freshwater chamber of membrane stack 1. The concentrate circuit consists of a concentrate tank 3, a concentrate pump 6, a concentrate filter 16, a concentrate cooler 12, a concentrate inlet valve 19, and a return water pipeline. It is responsible for delivering circulating maintenance fluid to the concentrate chamber of the membrane stack 1 and can start the cooler 12 to adjust the operating conditions according to temperature requirements. Electrode water circuit: It consists of electrode water tank 4, electrode water pump 7, electrode water filter 17, electrode water cooler 13, electrode water inlet valve 20 and return water pipeline. It is responsible for delivering circulating maintenance fluid to the electrode water chamber of membrane stack 1, and focuses on ensuring the wetting and cooling of the electrode area.

[0028] The following will describe in detail the specific structure and function of each unit in this system, including: First, let's explain the specific functions of the PLC control unit, including: When the electrodialysis membrane stack wetted system enters standby mode, and the PLC control unit detects that the preset start-up time interval has been reached or detects the start button signal when the user presses the start button, the PLC control unit generates a pre-detection signal and sends it to the monitoring and adjustment unit; the standby mode is used to indicate that the electrodialysis membrane stack is in a non-working standby state.

[0029] Specifically, in the embodiments of the application, the PLC control unit can, according to Figure 2 The preset time configured in the lubrication interval setting entry 32 counts down. When the lubrication interval timer 30 returns to zero, it is determined that the start time interval has been reached. At the same time, the trigger signal of the start button 33 can be monitored in real time. If either of the above two conditions is met, the pre-inspection process can be started, ensuring that both automatic and manual modes can be triggered.

[0030] In this application, the PLC control unit can also be used for: It receives flow sensor signals, temperature sensor signals, and pressure sensor signals from three branches fed back by the monitoring and control unit; When any one or more of the flow sensor signals, temperature sensor signals, and pressure sensor signals of the three branches fail to meet the corresponding preset flow threshold, temperature threshold, and pressure threshold, a pump stop signal and a valve close signal are sent to the power and transmission unit.

[0031] In this application, the flow sensor, temperature sensor, and pressure sensor can be installed in each branch near the main pipeline of the membrane stack. For example... Figure 2 Points 8, 9, and 10 are the comprehensive flow / pressure / temperature monitoring points corresponding to the freshwater path, concentrated water path, and polar water path.

[0032] Specifically, the PLC control unit can continuously receive real-time operating condition data uploaded from comprehensive detection points 8, 9, and 10, and compare it with internal preset thresholds in real time. Once abnormalities such as over-temperature, over-pressure, or insufficient flow occur, it immediately outputs protection commands, achieving fully unmanned safety monitoring. The internal preset thresholds can be set based on historical data, with no specific limitations.

[0033] Next, the specific structure and function of the detection and adjustment unit of this disclosure will be described below, including: The monitoring and control unit includes: a freshwater level sensor, a freshwater maintenance fluid conductivity sensor, a concentrated water level sensor, a concentrated water maintenance fluid conductivity sensor, an electrode water level sensor, and an electrode water maintenance fluid conductivity sensor. The monitoring and control unit receives the pre-detection signal sent by the PLC control unit and acquires the signals from the freshwater circuit level sensor, the freshwater circuit maintenance fluid conductivity sensor, the concentrated water circuit level sensor, the concentrated water circuit maintenance fluid conductivity sensor, the electrode water circuit level sensor, and the electrode water maintenance fluid conductivity sensor, respectively. When the signals from the freshwater level sensor, the freshwater maintenance fluid conductivity sensor, the concentrated water level sensor, the concentrated water maintenance fluid conductivity sensor, the electrode water level sensor, and the electrode water maintenance fluid conductivity sensor all sequentially meet the freshwater level threshold, the freshwater maintenance fluid conductivity threshold, the concentrated water level threshold, the concentrated water maintenance fluid conductivity threshold, and the electrode water level threshold and electrode water maintenance fluid conductivity threshold, respectively, the monitoring and adjustment unit generates a pre-inspection qualified signal and sends it to the PLC control unit. When any one of the following fails to meet the corresponding threshold values: freshwater level sensor signal, freshwater maintenance fluid conductivity sensor signal, concentrated water level sensor signal, concentrated water maintenance fluid conductivity sensor signal, polar water level sensor signal, and polar water maintenance fluid conductivity sensor signal, the monitoring and adjustment unit generates a pre-inspection failure signal and sends it to the PLC control unit; it receives the replenishment signal from the PLC control unit and replenishes the corresponding three branches based on the replenishment signal.

[0034] In this application, the aforementioned liquid level sensor and conductivity sensor can be respectively installed inside the freshwater tank 2, the concentrated water tank 3, and the electrode water tank 4 to collect the liquid level and water quality signals in the tank in real time. If the pre-inspection fails, the PLC will automatically start the liquid replenishment until the parameters meet the standards.

[0035] Specifically, after receiving the pre-inspection signal from the PLC control unit, the monitoring and regulation unit can simultaneously collect the liquid level sensor signals and maintenance fluid conductivity sensor signals corresponding to the freshwater, concentrated water, and electrode water paths. Each collected signal is compared one by one with its preset threshold. Only when the freshwater level signal meets the corresponding threshold, the freshwater conductivity signal meets the corresponding threshold, and the corresponding signals of the concentrated water and electrode water paths also meet their respective preset thresholds, and all three paths are normal, will a pre-inspection pass signal be generated and sent to the PLC control unit, allowing the PLC to start the subsequent valve opening and pump start-up processes. If any liquid level signal fails to reach the corresponding threshold, or any maintenance fluid conductivity signal exceeds the threshold... Upon receiving the conductivity threshold, the monitoring and control unit immediately generates a pre-inspection failure signal and sends it to the PLC control unit. Simultaneously, it stops sending qualified signals to the PLC. After receiving the failure signal, the PLC does not initiate the subsequent wetting process. Instead, it sends a replenishment signal to the monitoring and control unit. Based on this replenishment signal, the monitoring and control unit initiates automatic replenishment for the branches that have not met the standards. During the replenishment process, it continuously collects the liquid level and conductivity signals of the corresponding branches and feeds them back to the PLC in real time until both parameters of the branch meet the preset threshold. If multiple branches fail to meet the standards simultaneously, the replenishment operation of the corresponding branches is initiated synchronously. After all branches meet the standards, the monitoring and control unit regenerates the pre-inspection qualification signal and sends it to the PLC control unit to trigger the subsequent wetting process.

[0036] In addition to the aforementioned sensors, the monitoring and control unit of this application also includes: a freshwater flow sensor, a freshwater temperature sensor, a freshwater pressure sensor, a concentrate flow sensor, a concentrate temperature sensor, a concentrate pressure sensor, an electrode flow sensor, an electrode temperature sensor, an electrode pressure sensor, a concentrate cooler, and an electrode cooler. The monitoring and control unit acquires signals from the freshwater flow sensor, freshwater temperature sensor, freshwater pressure sensor, concentrate flow sensor, concentrate temperature sensor, concentrate pressure sensor, electrode water flow sensor, electrode water temperature sensor, and electrode water pressure sensor, and sends them to the PLC control unit. Within a preset period, the monitoring and adjustment unit acquires the first temperature of the concentrate cooler and the second temperature of the electrode cooler, and sends the first and second temperatures to the PLC controller; the monitoring and adjustment unit receives the start / stop commands for the concentrate cooler and the electrode cooler sent by the PLC controller; based on the start / stop commands for the concentrate cooler and the electrode cooler, the monitoring and adjustment unit starts and stops the concentrate cooler and the electrode cooler respectively.

[0037] In this application, the concentrate cooler 12 and the electrode cooler 13 can be connected in series to the main concentrate circuit and the main electrode circuit, respectively. The monitoring and adjustment unit can collect the return water temperature of the cooler in real time and upload it to the PLC. The PLC can automatically start and stop the cooler according to the temperature to ensure that the temperature of the maintenance fluid is stable within the appropriate range of the protective membrane stack.

[0038] Specifically, the monitoring and control unit can continuously collect the first temperature of the concentrate cooler 12 (i.e., the outlet temperature of the concentrate cooler) and the second temperature of the electrode cooler 13 (i.e., the outlet temperature of the electrode cooler) according to a preset cycle (this cycle can be customized through the parameter setting area of ​​the film control display panel 27), and synchronously upload the real-time temperature data to the PLC control unit. The PLC control unit has a preset suitable temperature range for the maintenance fluid (i.e., temperature threshold). When the first temperature of the concentrate cooler is detected to be higher than the upper limit of the preset temperature threshold, the PLC immediately sends a concentrate cooler start command to the monitoring and control unit. After receiving the command, the monitoring and control unit starts the concentrate cooler. Cooler 12 starts working to cool the concentrate circuit maintenance fluid until the first temperature drops to within the preset temperature threshold range. At this point, the PLC sends a stop command to the concentrate cooler, and the monitoring and regulation unit shuts down the concentrate cooler. Similarly, when the second temperature of the electrode cooler exceeds the upper limit of the preset temperature threshold, the PLC sends a start command to the electrode cooler, and the monitoring and regulation unit starts the electrode cooler 13. After cooling to within the threshold range, the unit receives a stop command from the PLC and shuts down the electrode cooler. If the first and second temperatures remain within the preset threshold range, the monitoring and regulation unit does not perform cooler start / stop operations, maintaining the cooler in a closed state to ensure stable maintenance fluid temperature and avoid energy waste.

[0039] Finally, the specific structure and function of the power and transmission unit of this application will be described, including: The power and transmission unit includes: freshwater inlet valve, freshwater outlet valve, concentrate inlet valve, concentrate outlet valve, electrode water inlet valve, and electrode water outlet valve. The power and transmission unit receives the valve opening signal sent by the PLC control unit and opens the freshwater inlet valve and freshwater outlet valve corresponding to the freshwater circuit. After the first delay, the power and transmission unit opens the corresponding concentrate inlet valve and concentrate outlet valve of the concentrate circuit. After the second delay, the power and transmission unit opens the corresponding electrode water inlet valve and electrode water outlet valve of the electrode water path; the first delay is less than the second delay.

[0040] In this application, the first delay can be understood as the stabilization waiting time after the freshwater valve is opened. The second delay can be understood as a longer buffer time after the concentrate valve is opened and before the electrode water valve is opened. It should be noted that the two delays increase progressively, with the aim of gradually building up the water pressure and avoiding hydraulic shock damage to the membrane stack caused by instantaneous full opening.

[0041] Specifically, the power and transmission units can be turned on sequentially according to PLC instructions. Figure 2 The freshwater inlet valve 11 and freshwater outlet valve 14 are opened after a first delay, followed by the concentrate inlet valve 19 and concentrate outlet valve 23. After a second delay, the electrode water inlet valve 20 and electrode water outlet valve 24 are opened, thus achieving a step-by-step and smooth opening of the three water channels.

[0042] In addition to the above-described structure, the power and transmission unit of this application also includes: a freshwater pump, a concentrated water pump, and an electrode water pump; The power and transmission unit receives the pump start signal sent by the PLC control unit, and based on the pump start signal, starts the fresh water pump, the concentrated water pump and the electrode water pump in sequence according to the order of fresh water path, concentrated water path and electrode water path, so that the maintenance solution circulates through the electrodialysis membrane stack.

[0043] Specifically, after all three valves are opened and stabilized, the power and transmission units start sequentially. Figure 2 The desalination pump 5, concentrate pump 6, and electrode water pump 7 drive the maintenance solution to flow along their respective closed-loop circulation paths to the membrane stack 1, completing continuous membrane wetting.

[0044] It should be noted that, in addition to the functions described above, the power and transmission unit of this application may also include: When the lubrication maintenance time reaches the preset lubrication interval, or when any one or more of the flow sensor signals, temperature sensor signals and pressure sensor signals of the three branches fail to meet the corresponding preset flow threshold, temperature threshold and pressure threshold, the power and transmission unit receives the pump stop signal sent by the PLC control unit, and based on the pump stop signal, stops the operation of the fresh water pump, the concentrated water pump and the polar water pump in the order of fresh water line, concentrated water line and polar water line. After the freshwater pump, concentrate pump, and electrode water pump stop for the third time, the power and transmission unit receives the valve closing signal sent by the PLC control unit. Based on the valve closing signal, it sequentially closes the freshwater inlet and outlet valves of the freshwater circuit, the concentrate inlet and outlet valves of the concentrate circuit, and the electrode water inlet and outlet valves of the electrode water circuit.

[0045] In this application, the preset wetting interval can be understood as the duration of a single wetting operation. This differs from the aforementioned start-up interval, which is the waiting period between two wetting operations, while the wetting interval is the actual duration of a single wetting operation. The two are respectively determined by… Figure 2 The settings 35 and 37 in the settings are independent and do not interfere with each other.

[0046] Specifically, when the single membrane wetting operation timer reaches the set value (36), or when the system detects an operational abnormality, the PLC first issues a pump stop command, sequentially stopping the freshwater pump 5, the concentrate pump 6, and the polar water pump 7; after the pressure stabilizes after the third delay, it then sequentially closes each inlet valve and return valve, completing the safe shutdown and returning to standby mode.

[0047] For example, this application also provides a specific method flow for electrodialysis membrane wetting. Figure 3 This is a flowchart illustrating a method for wetting an electrodialysis membrane according to an embodiment of this application. Figure 3 It can be seen that the entire film-wetting process runs automatically in a closed-loop timing logic, and the whole process is divided into 5 core execution steps. The specific operation logic is as follows: Step 0: The system is normally in the initial standby state. When the triggering conditions are met (the lubrication start button (33) is pressed and the stop button (34) is not triggered), the process flows down and waits for the start-up action.

[0048] Step 1: The system triggers the start-up action, sets the membrane wetting sequence flag to 1, and outputs a command to prepare to open the corresponding valves 11 and 14 in the freshwater circuit, completing the pre-start-up preparation.

[0049] Step 2: After valves 11 and 14 are fully in place and the first preset delay of 500ms is maintained, update the membrane wetting sequence to 2 and prepare to open valves 19 and 20 corresponding to the concentrate and electrode water circuits; after valves 19 and 20 are fully in place and the second preset delay of 2s is maintained, all three valves are opened smoothly to completely avoid water hammer and pressure shock caused by instantaneous large flow.

[0050] Step 3: After all valve circuits are stable, set the membrane wetting step sequence to 3, and start the freshwater pump (5), concentrate pump (6), and polar water pump (7) in sequence. At the same time, officially start the single membrane wetting operation timing module (36) to enter the continuous cycle maintenance membrane wetting stage.

[0051] Step 4: When the membrane wetting sequence is kept at 3 and the cumulative duration of a single membrane wetting operation (36) reaches the preset operation setting value (37), the timing is determined to be completed; then the membrane wetting sequence is updated to 4, and the operation of the three water pumps is stopped simultaneously; after the water pumps are shut down, a preset 3s delay is maintained, and after the water pressure in the pipeline is completely stable, all valves 11, 14, 19, and 20 are closed in sequence.

[0052] Step 5: After completing all valve closing actions, set the film wetting step sequence to 5 and start the film wetting interval countdown timer module (30). After the complete maintenance cycle is completed, the lubrication step sequence will be reset to zero, the timer for this run will be cleared, and the process loop will return to the initial standby state of step 0, waiting for the next cycle to be automatically triggered or manually started with one click.

[0053] It should be noted that, in addition to the aforementioned units, the electrodialysis membrane wetting system of this application may also include: The lubrication control display panel includes: lubrication start and stop buttons, lubrication maintenance interval and timer, and lubrication start interval and timer.

[0054] Specifically, the film wetting control display panel provides a human-machine interaction and parameter visualization management platform for the entire system. Operators can directly complete all operations such as customizing the film wetting cycle, viewing the running status in real time, and manually starting and stopping with one click on the panel, without having to go to the equipment site for complex manual operations, which greatly simplifies the operation and maintenance process.

[0055] For example, Figure 4 is a schematic diagram of the operation page of the film wetting control display panel provided in an embodiment of this application. As can be seen from Figure 4: The entire lubrication control display panel 27 is divided into two main functional areas: the upper part is the lubrication mode 29 operation area, and the lower part is the lubrication parameter area 28.

[0056] The film-lubricating mode area is equipped with a green start button 33 and a red stop button 34. Users can press the start button 33 to manually trigger a single film-lubricating process, and press the stop button 34 to terminate the currently running film-lubricating operation in one click. The film-lubricating parameters are divided into two timing modules: upper and lower. The first group is the lubrication and maintenance module 31, which includes real-time running timer 36 and single maintenance duration setting 37. The running timer 36 displays the number of seconds that the current lubrication has been running in real time, and the setting bar allows you to customize the duration of a single lubrication and maintenance session (as shown in the example set to 600 seconds). The second group is the 32-interval module for automatic film wetting start, which includes an interval countdown timer of 30 and a total start interval setting of 35. The timer 30 displays the remaining time until the next automatic film wetting start (as shown in the figure, 45 hours, 18 minutes, and 18 seconds remaining). The setting bar can be freely configured to configure the cycle interval between two automatic film wetting operations (as shown in the example, it is set to 48 hours).

[0057] This application also provides a method for electrodialysis membrane wetting, the method comprising: When the electrodialysis membrane wetting system enters standby mode and reaches the preset start-up time interval or detects the start button signal, the programmable logic controller (PLC) control unit sends a pre-inspection signal to the monitoring and regulation unit; it receives the pre-inspection pass signal from the monitoring and regulation unit, and based on the pre-inspection pass signal, sends the valve opening signal and pump start signal to the power and transmission units in sequence. The monitoring and control unit receives the pre-inspection signal sent by the PLC control unit. Based on the pre-inspection signal, it acquires the liquid level sensor signal and the maintenance fluid conductivity sensor signal of the three branches respectively. Based on the liquid level sensor signal and the maintenance fluid conductivity sensor signal of the three branches, a pre-inspection qualified signal is generated. The three branches include: fresh water path, concentrated water path and polar water path. The power and transmission unit receives valve opening signals from the PLC control unit and sequentially opens the corresponding membrane stack valves in the desalination, concentrate, and electrode water paths; it also receives pump start signals from the PLC control unit and sequentially starts the desalination pump, concentrate pump, and electrode water pump, so that the maintenance solution is circulated and transported to the electrodialysis membrane stack along the three branches. The electrodialysis membrane stack receives and circulates the maintenance solution from the power and transmission unit for membrane lubrication and maintenance.

[0058] In summary, this application provides an electrodialysis membrane wetting system and method. This application uses a programmable logic controller (PLC) control unit to send a pre-check signal to the monitoring and control unit when the electrodialysis membrane wetting system enters standby mode and reaches a preset start-up time interval or detects a start button signal; receive a pre-check pass signal from the monitoring and control unit, and based on the pre-check pass signal, sequentially send valve opening signals and pump start signals to the power and transmission units; the monitoring and control unit receives the pre-check signal sent by the PLC control unit, and based on the pre-check signal, acquires the liquid level sensor signals and maintenance fluid conductivity sensor signals of the three branches respectively; The system generates a pre-inspection pass signal based on the liquid level sensor signals and the conductivity sensor signals of the maintenance solution in three branches. The three branches include: a desalination line, a concentrate line, and an electrode water line. A power and transmission unit receives valve opening signals from the PLC control unit and sequentially opens the corresponding membrane stack valves in each of the three lines. It also receives pump start signals from the PLC control unit and sequentially starts the desalination pump, concentrate pump, and electrode water pump, allowing the maintenance solution to circulate and be delivered to the electrodialysis membrane stack along the three branches. The electrodialysis membrane stack receives the maintenance solution circulated by the power and transmission unit for membrane wetting and maintenance. Compared to existing purely manual maintenance methods, this application achieves fully automated control via PLC, enabling intelligent autonomous pre-inspection and circulating membrane wetting of the three liquid levels without the need for manual verification and repeated inspections. A single button trigger is all it takes to automatically complete the entire standardized membrane wetting and maintenance process. It can also automatically run in a timed cycle, completely eliminating reliance on manual experience and tedious manual operation, truly achieving unmanned, intelligent, one-button maintenance. In summary, the technical solution provided in this application can improve the accuracy, efficiency and safety of electrodialysis membrane wetting, and can be adapted to various application scenarios.

[0059] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments claimed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0060] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details of the above application are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0061] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0062] Additionally, as used herein, the "or" used in a list of items beginning with "at least one" indicates a separate list, such that a list of, for example, "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not imply that the described example is preferred or better than other examples.

[0063] It should also be noted that in the system and method of this application, the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of this application.

[0064] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims is not limited to the specific aspects of the processes, machines, manufactures, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufactures, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Therefore, the appended claims include such processes, machines, manufactures, events, means, methods, or actions within their scope.

[0065] The above description of the claimed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be applied within the widest scope consistent with the principles and novel features of this application.

[0066] The above description has been given for illustrative and descriptive purposes. Furthermore, this description is not intended to limit the embodiments of this application to the forms described herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. An electrodialysis membrane wetting system, characterized in that, The system includes: The programmable logic controller (PLC) control unit is used to send a pre-inspection signal to the monitoring and adjustment unit when the electrodialysis membrane wetting system enters the standby state and reaches the preset start-up time interval or detects the start button signal; receive the pre-inspection qualified signal fed back by the monitoring and adjustment unit; and based on the pre-inspection qualified signal, send the valve opening signal and the pump start signal to the power and transmission unit in sequence. The monitoring and adjustment unit is used to receive the pre-inspection signal sent by the PLC control unit, and based on the pre-inspection signal, acquire the liquid level sensor signals and maintenance fluid conductivity sensor signals of the three branches respectively; and generate the pre-inspection qualified signal based on the liquid level sensor signals and maintenance fluid conductivity sensor signals of the three branches; the three branches include: fresh water path, concentrated water path and polar water path; The power and transmission unit is used to receive the valve opening signal sent by the PLC control unit and sequentially open the membrane stack valves corresponding to each of the desalination path, the concentrate path and the electrode water path; and to receive the pump start signal sent by the PLC control unit and sequentially start the desalination pump, the concentrate pump and the electrode water pump so that the maintenance solution is circulated and transported to the electrodialysis membrane stack along the three branches. The electrodialysis membrane stack is used to receive the maintenance solution circulated by the power and transmission unit for membrane lubrication and maintenance.

2. The system according to claim 1, characterized in that, When the electrodialysis membrane stack wetted membrane system enters the standby state, and the PLC control unit detects that the preset start-up time interval has been reached or detects the start button signal when the user presses the start button, the PLC control unit generates the pre-detection signal and sends it to the monitoring and adjustment unit; the standby state is used to indicate that the electrodialysis membrane stack is in a non-working standby state.

3. The system according to claim 1, characterized in that, The PLC control unit is also used for: It receives the flow sensor signal, temperature sensor signal and pressure sensor signal from the three branches fed back by the monitoring and regulation unit; When any one or more of the flow sensor signals, temperature sensor signals, and pressure sensor signals of the three branches fail to meet the corresponding preset flow threshold, temperature threshold, and pressure threshold, a pump stop signal and a valve close signal are sent to the power and transmission unit.

4. The system according to claim 1, characterized in that, The monitoring and control unit includes: a freshwater level sensor, a freshwater maintenance fluid conductivity sensor, a concentrated water level sensor, a concentrated water maintenance fluid conductivity sensor, an electrode water level sensor, and an electrode water maintenance fluid conductivity sensor. The monitoring and adjustment unit receives the pre-detection signal sent by the PLC control unit, and acquires the signals from the freshwater level sensor, the freshwater maintenance fluid conductivity sensor, the concentrated water level sensor, the concentrated water maintenance fluid conductivity sensor, the electrode water level sensor, and the electrode water maintenance fluid conductivity sensor, respectively. When the signals from the freshwater level sensor, the freshwater maintenance fluid conductivity sensor, the concentrated water level sensor, the concentrated water maintenance fluid conductivity sensor, the electrode water level sensor, and the electrode water maintenance fluid conductivity sensor all sequentially satisfy the freshwater level threshold and the freshwater maintenance fluid conductivity threshold, the concentrated water level threshold and the concentrated water maintenance fluid conductivity threshold, and the electrode water level threshold and the electrode water maintenance fluid conductivity threshold, respectively, the monitoring and adjustment unit generates the pre-inspection qualified signal and sends it to the PLC control unit. When any one of the following fails to meet the corresponding threshold values ​​for the freshwater path level sensor signal, the freshwater path maintenance fluid conductivity sensor signal, the concentrated water path level sensor signal, the concentrated water path maintenance fluid conductivity sensor signal, the polar water path level sensor signal, and the polar water path maintenance fluid conductivity sensor signal: the freshwater path level threshold, the freshwater path maintenance fluid conductivity threshold, the concentrated water path level threshold, the concentrated water path maintenance fluid conductivity threshold, or the polar water path level threshold and polar water path maintenance fluid conductivity threshold, the monitoring and adjustment unit generates a pre-inspection failure signal and sends it to the PLC control unit; it receives the replenishment signal sent by the PLC control unit and replenishes the corresponding three branches based on the replenishment signal.

5. The system according to claim 1, characterized in that, The monitoring and control unit also includes: a freshwater flow sensor, a freshwater temperature sensor, a freshwater pressure sensor, a concentrate flow sensor, a concentrate temperature sensor, a concentrate pressure sensor, an electrode flow sensor, an electrode temperature sensor, an electrode pressure sensor, a concentrate cooler, and an electrode cooler. The monitoring and control unit acquires signals from the freshwater flow sensor, freshwater temperature sensor, freshwater pressure sensor, concentrate flow sensor, concentrate temperature sensor, concentrate pressure sensor, electrode flow sensor, electrode temperature sensor, and electrode pressure sensor, and sends them to the PLC control unit. Within a preset period, the monitoring and adjustment unit acquires the first temperature of the concentrate cooler and the second temperature of the electrode cooler, and sends the first temperature and the second temperature to the PLC controller; the monitoring and adjustment unit receives the concentrate cooler start / stop command and the electrode cooler start / stop command sent by the PLC controller; based on the concentrate cooler start / stop command and the electrode cooler start / stop command, the monitoring and adjustment unit starts and stops the concentrate cooler and the electrode cooler respectively.

6. The system according to claim 1, characterized in that, The power and transmission unit includes: a freshwater inlet valve, a freshwater outlet valve, a concentrate inlet valve, a concentrate outlet valve, an electrode water inlet valve, and an electrode water outlet valve. The power and transmission unit receives the valve opening signal sent by the PLC control unit and opens the freshwater inlet valve and the freshwater outlet valve corresponding to the freshwater circuit. After the first delay, the power and transmission unit opens the concentrate inlet valve and the concentrate outlet valve corresponding to the concentrate path; After the second delay, the power and transmission unit opens the electrode water inlet valve and the electrode water outlet valve corresponding to the electrode water path; the first delay is less than the second delay.

7. The system according to claim 1, characterized in that, The power and transmission unit includes: a freshwater pump, a concentrated water pump, and an extreme water pump; The power and transmission unit receives the pump start signal sent by the PLC control unit, and based on the pump start signal, starts the fresh water pump, the concentrated water pump and the electrode water pump in sequence according to the order of fresh water path, concentrated water path and electrode water path, so that the maintenance solution circulates through the electrodialysis membrane stack.

8. The system according to claim 1, characterized in that, When the lubrication maintenance time reaches the preset lubrication time interval, or when any one or more of the flow sensor signals, temperature sensor signals and pressure sensor signals of the three branches fail to meet the corresponding preset flow threshold, temperature threshold and pressure threshold, the power and transmission unit receives the pump stop signal sent by the PLC control unit, and based on the pump stop signal, stops the operation of the fresh water pump, the concentrated water pump and the polar water pump in the order of fresh water line, concentrated water line and polar water line. After a third delay following the shutdown of the freshwater pump, the concentrate pump, and the electrode water pump, the power and transmission unit receives the valve closing signal sent by the PLC control unit. Based on the valve closing signal, the unit sequentially closes the freshwater inlet and outlet valves of the freshwater circuit, the concentrate inlet and outlet valves of the concentrate circuit, and the electrode water inlet and outlet valves of the electrode water circuit.

9. The system according to claim 1, characterized in that, The system also includes: The lubrication control display panel includes: lubrication start and stop buttons, lubrication maintenance interval and timer, and lubrication start interval and timer.

10. A method for wetting an electrodialysis membrane, characterized in that, The method includes: When the electrodialysis membrane wetting system enters standby mode and reaches a preset start-up time interval or a start button signal is detected, the programmable logic controller (PLC) control unit sends a pre-inspection signal to the monitoring and adjustment unit; it receives the pre-inspection pass signal from the monitoring and adjustment unit, and based on the pre-inspection pass signal, sends a valve opening signal and a pump start signal to the power and transmission unit in sequence. The monitoring and adjustment unit receives the pre-inspection signal sent by the PLC control unit. Based on the pre-inspection signal, it acquires the liquid level sensor signals and maintenance fluid conductivity sensor signals of the three branches respectively. Based on the liquid level sensor signals and maintenance fluid conductivity sensor signals of the three branches, it generates the pre-inspection qualified signal. The three branches include: fresh water path, concentrated water path, and polar water path. The power and transmission unit receives the valve opening signal sent by the PLC control unit and sequentially opens the membrane stack valves corresponding to each of the desalination path, the concentrate path, and the electrode water path; it also receives the pump start signal sent by the PLC control unit and sequentially starts the desalination pump, the concentrate pump, and the electrode water pump, so that the maintenance solution is circulated and transported to the electrodialysis membrane stack along the three branches. The electrodialysis membrane stack receives the maintenance solution circulated by the power and transmission unit for membrane lubrication and maintenance.

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