Digitalized monitoring and control method for separation membrane shell stack

Abstract

The invention discloses a digital monitoring and control method for a separation membrane shell stack, and relates to the technical field of membrane separation. In order to solve the problem that in the prior art, a digital system for monitoring a separation membrane shell stack group in real time and automatically adjusting and processing according to the state is urgently needed so as to improve the stability and efficiency of system operation, the technical scheme provided by the invention is as follows: a digital monitoring and control method for the separation membrane shell stack group is provided. The method is realized based on the following devices: a separation membrane shell stack, a raw water pipeline, a concentrated water pipeline, a water production pipeline, a sensor and a control system. The method comprises the following steps: adding raw water; opening valves of a concentrated water pipeline and a water production pipeline; starting a raw water inlet pipeline; and starting a high-pressure pump, and pushing the raw water to enter the membrane stack for reverse osmosis separation. The method is suitable for being applied to the digital monitoring work of the separation membrane shell stack.

Description

Technical Field

[0001] The invention relates to the technical field of membrane separation, and in particular to digital monitoring of a separation membrane housing stack. Background Art

[0002] The existing separation membrane shell stack system has been widely used in the fields of water treatment and liquid separation. It has the advantages of low cost, compact structure, and operation cancellation, and is favored by the engineering field. However, with the advancement of technology and the continuous improvement of demand, there are some problems that need to be solved in the existing separation membrane shell group. Traditional monitoring systems usually lack effective digital and automatic control functions, and cannot take timely response measures when the equipment has abnormal operation. Specifically, when the membrane element is blocked or damaged due to stains, the system is often unable to detect the specific problem location in real time, resulting in unnecessary damage and component replacement, which again increases costs and affects the continuous maintenance of the system. Operation. Therefore, there is an urgent need for a digital system that can monitor the separation membrane shell stack in real time and automatically adjust and process it according to the status to improve the stability and efficiency of the system operation. Summary of the invention

[0003] In order to solve the problem in the prior art that a digital system is urgently needed to monitor the separation membrane housing stack in real time and automatically adjust and process according to the status to improve the stability and efficiency of the system operation, the technical solution provided by the present invention is:

[0004] A method for digital monitoring and control of a separation membrane housing stack, the method being implemented based on the following device:

[0005] Separation membrane shell stack, used for membrane separation of raw water to produce produced water and concentrated water;

[0006] A raw water pipeline, connected to the water tank and high-pressure tap water, is used to pipe the raw water to the separation membrane shell stack;

[0007] A concentrated water pipeline is connected to the separation membrane housing stack and is used to discharge concentrated water produced after separation;

[0008] The water production pipeline is connected to the separation membrane housing stack and is used to collect the produced water produced after separation; the sensor is used to discharge the concentrated water produced after separation; the water production pipeline is used to collect the produced water produced after separation;

[0009] A sensor for real-time monitoring of the operating status of the raw water pipeline;

[0010] A control system, electrically connected to the sensor, for receiving a sensing signal and controlling the operation of the high-pressure water pump according to the signal;

[0011] Methods include:

[0012] Steps for adding raw water;

[0013] Steps for opening the valves of the concentrate pipeline and the produced water pipeline;

[0014] Steps for priming the raw water inlet pipeline;

[0015] The step of starting the high-pressure pump to push the raw water into the membrane stack for reverse osmosis separation.

[0016] Furthermore, a preferred embodiment is provided, which also includes real-time monitoring of the water inlet pressure, flow rate, membrane element pressure difference and water production flow rate of the device through sensors, and the step of initiating automatic cleaning or alarming under abnormal circumstances.

[0017] Furthermore, a preferred embodiment is provided, which also includes the step of stopping adding raw water when the preset amount of raw water is added.

[0018] Furthermore, a preferred embodiment is provided, which stipulates that the raw water is seawater.

[0019] Furthermore, a preferred embodiment is provided, which also includes a step of cleaning the device when the pressure difference of the membrane element reaches a set value or the produced water flow rate decreases by more than 10%.

[0020] Based on the same inventive concept, the present invention also provides a separation membrane housing stack digital monitoring and control method, comprising:

[0021] Steps for collecting raw water levels;

[0022] The steps of collecting and responding to valve opening signals;

[0023] Steps for collecting and responding to raw water inlet signals;

[0024] The steps of collecting and responding to the signals from reverse osmosis separation.

[0025] Based on the same inventive concept, the present invention also provides a digital monitoring and control device for a separation membrane box housing stack, comprising:

[0026] Module for collecting raw water level;

[0027] A module that collects and responds to valve switch signals;

[0028] A module for collecting and responding to raw water inlet signals;

[0029] A module that collects and responds to reverse osmosis separation signals.

[0030] Based on the same inventive concept, the present invention also provides a computer storage medium for storing a computer program, and when a computer reads the computer program, the method is executed.

[0031] Based on the same inventive concept, the present invention also provides a computer, including a processor and a storage medium, and when the processor reads the stored computer program, the method is executed.

[0032] Based on the same inventive concept, the present invention also provides a computer program product, which is a computer program. When the computer program is executed, the method is implemented.

[0033] Compared with the prior art, the technical solution provided by the present invention is beneficial in that:

[0034] The present invention provides a digital monitoring and control method for a separation membrane housing stack. By real-time monitoring of parameters such as pressure, flow rate and pressure difference of the raw water pipeline, digital monitoring of the operation status of the separation membrane housing stack is achieved, effectively avoiding problems such as membrane element contamination and blockage that cause system performance degradation. This method improves the reliability and operation efficiency of the system by providing accurate real-time data.

[0035] The system of the present invention can automatically add chemical agents during cleaning or maintenance, simplifying manual operations, reducing maintenance costs and improving the automation level of the system. This function ensures that the membrane elements can be cleaned in time under different working conditions, thereby extending the system's life.

[0036] Through the linkage control of the system and sensors, automatic adjustment of high-pressure water pumps and valves is achieved. The system can automatically adjust the flow and pressure according to different operating conditions, reduce the frequency of manual control, and maintain a stable operating state, thereby significantly improving the overall performance of the system and ease of operation.

[0037] The system can detect the contamination of membrane elements in real time and perform cleaning operations in time to avoid performance degradation caused by membrane contamination or blockage. This function not only reduces the maintenance frequency, but also extends the service life of membrane elements and reduces the cost of replacing membrane elements.

[0038] The present invention realizes automatic control through the cooperation of sensors and control systems. The sensors monitor various key parameters in real time and automatically adjust the operation of high pressure, valves and dosing devices through the control system, reducing the influence of operators. Control reduces the risk of manual misoperation and improves operating efficiency.

[0039] The system ensures that the separation membrane shell stack is always in the best working condition by real-time monitoring and adjusting operating parameters such as pressure, flow and pressure difference. This precise control method improves water treatment efficiency, while ensuring the quality stability of produced water and concentrated water, further improving the overall water treatment effect of the system.

[0040] The present invention can monitor abnormal conditions in the system in real time (such as reminding membrane elements, excessive pressure or abnormal flow, etc.) through differential pressure and pressure sensors. When an abnormality is detected, the system will automatically send out an alarm signal, and the operator will handle it in time to avoid sudden system failures that lead to production interruptions or losses, greatly improving the safety and reliability of the system.

[0041] The automatic dosing device cooperates with the intelligent control system to automatically perform dosing operations when the system is cleaned, and the operator does not need to perform tedious drug handling work. At the same time, the real-time monitoring function provides accurate operation data and status reports, simplifies the maintenance process, and improves the convenience of system maintenance.

[0042] The system adopts a modular design, and each part such as the separation membrane shell stack, sensors and control system can be maintained, expanded or replaced individually. If new sensors or control technologies are introduced in the future, the system can be easily upgraded to ensure its technological leadership and long-term use value.

[0043] The monitoring and control method of the present invention realizes automatic operation by using sensors to monitor the key parameters of the system (such as water inlet pressure, flow, membrane element pressure difference and water production flow) in real time, combined with the automatic adjustment of the high-pressure pump and valve by the control system. This approach reduces manual intervention, improves the automation level of the system, and reduces the complexity of operation and maintenance.

[0044] The system can accurately control the operating speed of the high-pressure pump and automatically adjust the pump power according to the real-time monitored pressure and flow, thus avoiding energy waste. Compared with the traditional fixed power operation mode, the system can optimize energy utilization and achieve high efficiency and energy saving.

[0045] The automatic cleaning function starts cleaning in time when the membrane element is detected to be blocked, preventing the membrane element from being in a high pressure difference state for a long time, reducing equipment noise and unnecessary replacement. Through regular cleaning, the service life of the membrane element can be extended and the operating cost can be reduced.

[0046] Through real-time monitoring and dynamic adjustment of various parameters, the system effectively reduces the risk of emergencies caused by improper operation or equipment failure, ensures the stable operation of the system under various abnormal working conditions, and can respond to situations faster and more accurately.

[0047] The system can monitor the pressure difference of the membrane elements and accurately locate which membrane element is blocked or punctured, thus avoiding unnecessary overall cleaning or replacement, reducing the time per hour and improving maintenance efficiency.

[0048] The system also monitors the water flow and conductivity to ensure that the water quality always meets the set standards. If the water quality does not meet the standards, the system will automatically alarm and remind the operator to perform maintenance to ensure efficient and continuous water treatment.

[0049] The present invention reduces system maintenance and manpower input, and the timely automatic cleaning function reduces the possibility of membrane element damage, prolongs its service life, and reduces equipment replacement costs and consumables manpower.

[0050] The invention provides a separation membrane housing stack digital monitoring and control method, which is suitable for use in the work of digital monitoring of separation membrane housing stacks. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A three-dimensional view of a digital monitoring and control device for a separation membrane housing stack;

[0052] Figure 2 for Figure 1 The main view;

[0053] Figure 3 for Figure 1 A top view of

[0054] Figure 4 The present invention is a system schematic diagram of a digital monitoring and control device for a separation membrane shell stack.

[0055] Among them, 1 represents the separation membrane shell stack, 2 represents the raw water pipeline, 3 represents the high-pressure water pump, 4 represents the concentrated water pipeline, 5 represents the produced water pipeline, 6 represents the control system, 7 represents the device frame, 8 represents the water tank, 1-1 represents the differential pressure transmitter, 1-2 represents the pressure taking tee, and 1-3 represents the hydraulic hose. DETAILED DESCRIPTION

[0056] In order to make the advantages and benefits of the technical solution provided by the present invention more clearly reflected, the technical solution provided by the present invention is now further described in detail with reference to the accompanying drawings, specifically:

[0057] Embodiment 1: This embodiment provides a digital monitoring and control device for a separation membrane housing stack 1, comprising:

[0058] The separation membrane housing stack 1 is used for performing membrane separation on raw water to produce produced water and concentrated water;

[0059] A raw water pipeline 2, connected to a water tank 8 and a high-pressure water pump 3, is used to transport the raw water to the separation membrane housing stack 1;

[0060] The concentrated water pipeline 4 is connected to the separation membrane housing stack 1 and is used to discharge the concentrated water produced after separation;

[0061] The produced water pipeline 5 is connected to the separation membrane housing stack 1 and is used to collect the produced water produced after separation;

[0062] A sensor for monitoring the operating status of the raw water pipeline 2 in real time;

[0063] The control system 6 is electrically connected to the sensor, and is used to receive the sensor signal and control the operation of the high-pressure water pump 3 according to the signal.

[0064] Specifically: The structure is:

[0065] 1. Separation membrane shell stack 1

[0066] Function: Core component used for membrane separation, such as reverse osmosis or ultrafiltration, to separate raw water into product water and concentrate.

[0067] Connection relationship: The component is connected to the high-pressure water pump 3 through the raw water pipeline 2, and the concentrated water pipeline 4 and the produced water pipeline 5 absorb the concentrated water and collect the produced water respectively.

[0068] It also includes pressure-taking tees 1-2 and hydraulic hoses 1-3.

[0069] 2. Differential pressure transmitter 1-1

[0070] Function: It is used to detect the steady-state pressure difference of the membrane element. Through the pressure difference feedback, the operating status of the membrane element can be understood in real time to determine whether there is pollution, blockage and other problems.

[0071] Connection relationship: Installed at the inlet and outlet of the separation membrane housing stack 1, connected to the digital control system 6, and transmits data to the controller in real time.

[0072] 3. Raw water pipeline 2

[0073] Function: Used to connect the raw water pipeline 2 to the separation membrane housing stack 1. Usually equipped with a pressure sensor, a switch valve and a flow meter to monitor the water flow and pressure in real time.

[0074] Connection relationship: Connect the water tank 8 and the high-pressure water pump 3, and at the same time communicate with the separation membrane shell stack 1 to form a water inlet loop.

[0075] 4. High pressure water pump 3

[0076] Function: To increase the pressure of raw water to ensure that the pressure required for membrane separation is reached. It is usually used in reverse osmosis systems.

[0077] Connection relationship: connected to the raw water pipeline 2 for water supply system preset. Connected to the control device through the power cord for remote control and automatic adjustment.

[0078] 5. Concentrated water pipeline 4

[0079] Function: In order to collect and discharge concentrated water, a pressure sensor and a switch valve are usually installed on the concentrated water pipeline 4 to monitor the discharge status of the concentrated water.

[0080] Connection relationship: connected to the separation membrane shell stack 1, and the concentrated water is transported through this pipeline system.

[0081] 6. Water production pipeline 5

[0082] Function: Collect the produced water after membrane separation and monitor the produced water volume through flow meter.

[0083] Connection relationship: connected to separation membrane shell stack 1, produced water is declared and collected through this pipeline.

[0084] 7. Water tank 8 (8 pieces)

[0085] Function: It is used to store raw water and is equipped with an automatic dosing device during cleaning or maintenance to clean the system through the water tank 8. The dosing maintenance device can add chemicals as needed.

[0086] Connection relationship: Connected to raw water pipeline 2 as the water source of the system.

[0087] 8. Sensors

[0088] Function: monitor water flow, pressure and other key parameters to ensure the whole system operates within the normal working range. Through the feedback of these sensors, the system can realize automatic control and monitoring.

[0089] Connection relationship: Each sensor is connected to the control box through a signal line, and all data monitoring is transmitted to the digital control system 6.

[0090] 9. Control system 6

[0091] Function: By collecting data from various sensors, analyzing and processing the data, the system 6 controls the working status of the switch valve, automatic dosing device and high-pressure water pump 3. The system can make real-time adjustments according to the working status of the membrane stack to ensure the safe and efficient operation of the system.

[0092] Connection: The control system 6 is connected to each sensor through a signal line, receives monitoring data, and controls actuators such as the switch valve, high-pressure water pump 3 and dosing device through a power line.

[0093] 10. Switch valve

[0094] Function: Used to control the opening and closing of water flow, ensuring that the water flow is turned on or off when needed.

[0095] Connection relationship: Installed on the raw water, concentrated water and produced water pipelines 5, the opening and closing actions are remotely controlled by control signals.

[0096] 11. Device frame 7

[0097] Function: Provide physical support and mounting structure for the entire device, ensuring that each component can be quickly fixed in the system.

[0098] Connection relationship: All components are installed on the device frame 7 to provide integrated structural support.

[0099] 12. Automatic dosing device

[0100] Function: Automatically add chemicals when cleaning or maintaining the device to clean the membrane and maintain system performance.

[0101] Connection relationship: connected to the water tank 8, and can automatically start or stop the reagent adding process according to the instructions of the control system 6.

[0102] 13. Power cable and signal cable

[0103] Function: The power line supplies power to the device, and the signal line is used to send control signals and monitor data.

[0104] Connection relationship: All signal transmission equipment (such as sensors, valve switches, high-pressure water pumps 3, and dosing devices) are connected to the power control system 6 through these lines.

[0105] The interconnection relationship between components:

[0106] Water flow path: Raw water enters the high-pressure water pump 3 from the water tank 8 through the raw water pipeline 2, and then flows into the separation membrane shell stack 1. After reverse osmosis treatment, the produced water is collected through the produced water pipeline 5, and the concentrated water is sucked into the concentrated water pipeline 4.

[0107] Signal and control path: The sensor collects the pressure difference, flow and pressure data in the system in real time, and transmits them to the control box through the signal line. The PLC control system 6 data controls the action of each actuator (switch valve, high-pressure water pump 3, automatic dosing device) according to the analysis results to achieve automatic monitoring and adjustment.

[0108] The control method of the above device is:

[0109] Brief description: This technical solution involves the use of sensors, control modules and digital monitoring systems to achieve real-time monitoring and automatic control of the separation membrane shell stack. During operation, by collecting and analyzing data such as flow, pressure, conductivity, etc., the operating status of the system can be judged in a timely manner, and the high-pressure pump and valve can be automatically adjusted according to the set parameters to ensure the stable operation of the system. For abnormal conditions such as fouling and breakdown of membrane elements, the system can also respond accordingly, such as alarming, automatic cleaning or stopping operation.

[0110] Step 1: Add water

[0111] Brief description: Inject make-up water (usually seawater) into the raw water tank through a soft water pipe, monitor the tank liquid level, and ensure that the water level in the tank is within a safe range.

[0112] The system opens the water replenishment valve in the soft water pipeline through a control program to introduce replenishment water (such as seawater) into the raw water tank.

[0113] During the water replenishment process, the liquid level sensor in the water tank monitors the water level in real time. When the water level in the water tank reaches the set height, the system automatically closes the water replenishment valve and stops replenishing water to ensure that the water level is within a safe range and avoid failures or low water levels affecting system operation.

[0114] Step 2: Open the concentrated water pipeline and the produced water pipeline valves

[0115] Simply open the designated valve of the brine discharge pipeline, the ball valve at the brine pressure of the membrane module, and the ball valve on the produced water outlet pipeline to prepare the flow path for the produced water and brine.

[0116] The operator manually or through program control first opens the air extraction valve on the concentrate discharge pipeline and the ball valve at the concentrate pressure of the valve membrane group to ensure that the concentrate can be discharged smoothly after being filtered by the membrane element.

[0117] At the same time, the ball valve on the water outlet pipe is also opened to ensure that the filtered water can flow normally into the water collection pipe.

[0118] Step 3: Open the raw water inlet pipe and high-pressure pump inlet valve

[0119] Brief description: Open the raw water inlet pipeline, the low-pressure switch ball valve at the high-pressure pump inlet and the membrane module inlet pressure ball valve to prepare for the filtration of raw water.

[0120] After the system is started, open the ball valve on the raw water inlet pipe, the low-pressure switch ball valve at the inlet of the high-pressure pump, and the membrane group inlet pressure ball valve in turn.

[0121] The raw water enters the membrane stack from the raw water tank through the water inlet pipe. Before that, the raw water will pass through the filter in the water pipe to ensure that the water quality meets the requirements before entering the membrane element.

[0122] Step 4: Start the high-pressure pump and push the raw water into the membrane stack

[0123] Simple

[0124] Start the high-pressure pump to push the raw water through the filter and into the membrane stack.

[0125] The system starts the high-pressure pump, and uses the power of the high-pressure pump to send the raw water in the raw water tank through pipes and filters into the membrane stack.

[0126] Driven by a high-pressure pump, the raw water enters the membrane elements in the membrane group for filtration to separate produced water and concentrated water.

[0127] Step 5: Monitor and adjust the membrane module inlet water pressure and flow

[0128] Brief description: Monitor the water inlet pressure and flow of the membrane module in real time, and maintain stable operating parameters by adjusting the high-pressure pump and pumping valve.

[0129] The system monitors the inlet pressure and flow rate of the membrane module in real time through the inlet pressure sensor and flow meter.

[0130] If the flow exceeds the optimal water inlet pressure or set value, the system adjusts the high-pressure water pump through the high-pressure pump's frequency conversion controller to control the water inlet pressure and flow to ensure that the system operates in the best condition.

[0131] Step 6: Monitor module pressure difference and water flow

[0132] Brief description: Real-time monitoring of the overload pressure difference and water production flow of membrane elements to ensure the normal operation of the membrane group and prevent fouling or breakdown.

[0133] The system monitors the pressure difference of each membrane element through the membrane element pressure difference sensor to ensure the normal operation of the membrane element. When the membrane element pressure difference exceeds the set value, the system will issue an alarm signal and stop running.

[0134] At the same time, the water flow meter will continuously monitor the water flow of the membrane group. If the water flow is abnormal (too high or too low), the system will issue a water quality detection notice, indicating that there may be water quality problems.

[0135] Step 7: Automatic cleaning under abnormal conditions or frequently

[0136] Brief description: When the membrane element is blocked or punctured, the system will automatically take cleaning measures or maintenance, and prompt the specific location of the faulty membrane element.

[0137] If the monitored water flow rate drops by 10% or the pressure difference of the membrane element reaches 0.04MPa, the system will start the automatic cleaning function. The concentrated water and produced water will flow back to the water tank through the bypass pipeline, and chemical agents will be added to the water tank for cleaning. After completion, the system will automatically flush the pipeline to ensure that there is no chemical residue.

[0138] If a membrane element breaks down, and the system detects that the air pressure deviation of the membrane element is abnormally low or the conductivity of the produced water exceeds the set value, the system will automatically stop the water supply and alarm to indicate the specific damaged membrane element, so that it can be replaced in time.

[0139] Furthermore, the sensor includes a pressure sensor, a flow meter and a differential pressure transmitter 1-1.

[0140] Furthermore, it also includes a high-pressure water pump 3 connected to the raw water pipeline 2 for increasing the pressure of the raw water.

[0141] Furthermore, it also includes an automatic dosing device for automatically adding chemicals when the device is cleaned or maintained.

[0142] Furthermore, the separation membrane housing stack 1 includes a plurality of membrane elements, and the voltage difference of each membrane element is monitored by a differential pressure transmitter 1 - 1 to determine the operating state of the membrane element.

[0143] Furthermore, a switch valve is installed on the raw water pipeline 2 for controlling the flow in the raw water pipeline 2 according to the sensor signal.

[0144] Furthermore, the control system 6 is implemented by an input logic controller.

[0145] Furthermore, a water tank 8 is included for storing raw water.

[0146] Furthermore, a device frame 7 is included to provide physical support for the device.

[0147] Embodiment 2: This embodiment provides a separation membrane housing stack digital monitoring and control method, including:

[0148] Steps for collecting raw water levels;

[0149] The steps of collecting and responding to valve opening signals;

[0150] Steps for collecting and responding to raw water inlet signals;

[0151] The steps of acquiring and responding to reverse osmosis separation signals.

[0152] Embodiment 3: This embodiment provides a separation membrane housing stack digital monitoring and control device, including:

[0153] Module for collecting raw water level;

[0154] A module that collects and responds to valve opening signals;

[0155] A module for collecting and responding to raw water inlet signals;

[0156] A module that collects and responds to reverse osmosis separation signals.

[0157] Implementation Method XI: Combination Figure 1-4 This embodiment is described in detail by using specific examples to further describe the technical solution provided above. Specifically:

[0158] The water circuit sequence of the device is:

[0159] Water tank 8: As the water source of the system, it stores raw water.

[0160] Raw water pipeline: The raw water in the water tank 8 enters the system through the raw water pipeline and flows to the high-pressure water pump 3.

[0161] High-pressure water pump 3: The raw water passes through the high-pressure water pump 3 tower before entering the separation membrane shell stack 1 to reach the pressure required for reverse osmosis or other membrane separation.

[0162] Separation membrane shell stack 1: The raw water after dismantling enters the separation membrane shell stack 1 through the raw water pipeline for membrane separation. This produces two parts: produced water and concentrated water.

[0163] Water production pipeline: The water produced after membrane separation is collected and output to the system through the water production pipeline.

[0164] Brine pipeline: The remaining brine passes through the brine pipeline breathing system.

[0165] Water tank 8 → raw water pipeline → high-pressure water pump 3 → separation membrane housing stack 1 → produced water pipeline / concentrated water pipeline.

[0166] The detailed implementation method is:

[0167] Waterway layout

[0168] The water in the device is used to store raw water, and the raw water is transported to the high-pressure water pump 3 through the raw water pipeline.

[0169] The high-pressure water pump 3 pressurizes the raw water to achieve the pressure required for regulation.

[0170] After passing through the separation membrane shell stack 1, the raw water is separated into produced water and concentrated water, which disappear through the produced water pipeline 5 and the concentrated water pipeline 4 respectively.

[0171] Sensor placement

[0172] Pressure sensors, flow meters and differential pressure sensors are installed on the raw water pipeline, produced water pipeline and concentrated water pipeline respectively to monitor the system operation status in real time.

[0173] The differential pressure sensor is particularly used to monitor the pressure difference of the membrane element to determine the operating status of the membrane element.

[0174] Control system 6 design

[0175] The control system 6 is electrically connected to the sensor through the PLC unit, receives real-time data, and determines the working status of the system based on the data.

[0176] The system automatically controls the operation of the high-pressure valve, as well as the actions of the switch and automatic dosing device according to different operating conditions.

[0177] Automatic dosing and cleaning

[0178] When the system is cleaned or maintained, the automatic dosing device automatically adds the chemical agents for the cleaning operation of the membrane elements according to the instructions of the control system 6.

[0179] Specifically, the operation steps are:

[0180] Step 1: Introduce supplementary water (usually seawater) into the raw water tank 8 through the soft water pipe 2.

[0181] Step 2: Open the valve on the concentrated water pipeline 4 and the ball valve at the concentrated water pressure of the membrane group 1.

[0182] Step 3: Open the ball valve on the produced water outlet pipeline 5.

[0183] Step 4: Open the ball valve on the raw water inlet pipe 2, the low-pressure switch ball valve on the inlet of the high-pressure pump 3, and the water inlet pressure ball valve of the membrane group 1.

[0184] Step 5: Start the high-pressure pump 3 , and the raw water passes through the pipeline filter in the raw water tank 8 and then enters the membrane stack 1 through the pipeline 2 .

[0185] Step 6: The raw water is filtered through the membrane elements in the membrane stack 1 , the concentrated water is discharged through the concentrated water drainage pipe 4 , and the produced water is collected through the produced water outlet pipe 5 .

[0186] Step 7: Monitor the flow data of the water production flow meter of membrane group 1, and monitor the pressure difference of the membrane module waterfall through the differential pressure table 1-1, the pressure taking tee 1-2 and the hydraulic top 1-3.

[0187] Digital monitoring and control system:

[0188] Step 1: When the water tank liquid level 6 monitors in real time that the water tank 8 liquid level reaches the program-set height, the control system 6 will automatically close the water replenishment valve.

[0189] Step 5: Through dual monitoring of the water tank level sensor 6 and the low-pressure switch at the inlet of the high-pressure pump 3, when the water tank 8 liquid level is lower than the set value or the inlet pressure of the high-pressure pump 3 is lower than the set value, the control system 6 will automatically shut down the high-pressure pump 3.

[0190] Step 6: The control system 6 monitors the inlet flow rate, inlet pressure, concentrate pressure and concentrate flow rate of the membrane group 1 in real time, and makes corresponding controls:

[0191] Case 1: When the water inlet flow rate and the water inlet pressure are both lower than or equal to the set value, the control system 6 adjusts the pump speed through the frequency conversion controller of the high-pressure pump 3 to adjust the water inlet flow rate and control the pressure.

[0192] Control situation 2: When the inlet water flow rate reaches the set value but the inlet water pressure is no longer the set value, the control system 6 adjusts the inlet water pressure by adjusting the opening and closing degree of the valve of the concentrated water discharge pipeline 4.

[0193] Control situation three: when the inlet water pressure reaches the set value but the inlet water flow rate deviates from the set value, the control system 6 adjusts the inlet water flow rate by adjusting the valve of the concentrated water discharge pipeline 4.

[0194] Control situation 4: If the monitored pressure difference of the membrane element 1-1 deviates from the set value, the control system 6 will automatically issue an alarm.

[0195] Control situation five: When the water flow rate is detected to exceed or fall below the set value, the control system 6 will automatically issue a water quality detection notification.

[0196] Step 7: The control system 6 monitors the water flow rate of the membrane group 1, the voltage difference of the membrane element 1-1 and the conductivity of the water in real time to determine the fouling and breakdown of the membrane element and make corresponding controls:

[0197] Control flow situation 1: When the produced water drops by 10% or the pressure difference of membrane element 1-1 through the waterfall reaches 0.04MPa, the control system 6 will start the automatic cleaning function, the concentrated water and produced water bypass pipeline will flow back to the water tank 8, and the remote chemical agent will be added for cleaning. After cleaning, the control system 6 will empty the chemical water in the water tank 8 and flush the entire system to remove residual chemicals.

[0198] Case 2: When the pressure difference of the water pump controlling the membrane element 1-1 is lower than 0.005MPa, the conductivity of the produced water exceeds the set value or the produced water flow rate suddenly increases, the control system 6 determines that the membrane element is broken down. At this time, the control system 6 will automatically close the water inlet of the membrane group 1 and issue an alarm to indicate the specific location of the damaged membrane element to improve replacement efficiency and reduce maintenance costs.

[0199] The traditional membrane stack cannot detect the extreme pressure difference of each membrane element 1-1, and cannot accurately determine which membrane element is blocked or broken, which often leads to blind cleaning or replacement of spare parts, which wastes a lot of manpower and material resources and increases theft time. The control system 6 can accurately determine the problem during online operation, reduce the shortest time and improve operation efficiency.

[0200] The technical solution provided by the present invention is further described in detail above through several specific implementation modes in order to highlight the advantages and benefits of the technical solution provided by the present invention. However, the several specific implementation modes described above are not intended to be used as limitations on the present invention. Any reasonable modification and improvement of the present invention, combination of implementation modes and equivalent substitution within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for digital monitoring and control of a separation membrane housing stack, characterized in that: The method is implemented based on the following device: Separation membrane shell stack is used to separate raw water by membrane method to produce produced water and concentrated water; A raw water pipeline, connected to a water tank and a high-pressure water pump, for conveying raw water to the separation membrane housing stack; The concentrated water pipeline is connected to the separation membrane housing stack and is used to discharge the concentrated water produced after separation; The produced water pipeline is connected to the separation membrane housing stack and is used to collect the produced water produced after separation; A sensor for monitoring the operating status of the raw water pipeline in real time; A control system, electrically connected to the sensor, for receiving a sensing signal and controlling the operation of the high-pressure water pump according to the signal; Methods include: Steps for adding raw water; Steps for opening the valves of the concentrate pipeline and the produced water pipeline; Steps for priming the raw water inlet pipeline; The step of starting the high-pressure pump to push the raw water into the membrane stack for reverse osmosis separation.

2. A separation membrane housing stack digital monitoring and control method according to claim 1, characterized in that: The method also includes the steps of monitoring the water inlet pressure, flow rate, membrane element pressure difference and produced water flow rate of the device in real time through sensors, and starting automatic cleaning or alarming under abnormal circumstances.

3. A separation membrane housing stack digital monitoring and control method according to claim 1, characterized in that: The method also includes the step of stopping adding raw water when the raw water reaches a preset addition amount.

4. A separation membrane housing stack digital monitoring and control method according to claim 1, characterized in that: The raw water is seawater.

5. A separation membrane housing stack digital monitoring and control method according to claim 1, characterized in that: The method also includes a step of cleaning the device when the pressure difference of the membrane element reaches a set value or the produced water flow rate drops by more than 10%.

6. A method for digital monitoring and control of a separation membrane housing stack, characterized in that: include: Steps for collecting raw water levels; The steps of collecting and responding to valve opening signals; Steps for collecting and responding to raw water inlet signals; The steps of acquiring and responding to reverse osmosis separation signals.

7. A digital monitoring and control device for a separation membrane housing stack, characterized in that: include: Module for collecting raw water level; A module that collects and responds to valve opening signals; A module for collecting and responding to raw water inlet signals; A module that collects and responds to reverse osmosis separation signals.

8. A computer storage medium for storing a computing program, characterized in that: When the computer reads the computer program, the computer executes the method of claim 6.

9. A computer, comprising a processor and a storage medium, characterized in that: When the processor reads the computer program stored in the storage medium, the computer executes the method of claim 6 .

10. A computer program product, being a computer program, characterized in that When the computer program is executed, the method according to claim 6 is implemented.

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