Full-automatic cleaning process for ultrafiltration device

Abstract

The invention discloses a full-automatic cleaning process for an ultrafiltration device, and relates to the technical field of water treatment of thermal power plants. According to the device system, a full-automatic cleaning process is adopted, the operation amount is small, the reliability is high, the total amount of various kinds of waste water is greatly reduced, the high recovery rate can be achieved, the water consumption of a whole plant is effectively reduced, and meanwhile corrosion of a flushing device to a pipeline system is greatly reduced; the detection module is used for monitoring multi-dimensional data such as inlet and produced water pressure, flow, water quality, operation time and cleaning times in real time, comprehensively calculating the membrane pollution degree, ensuring that cleaning is started before the membrane pollution affects the system performance, avoiding pollution aggravation and ensuring efficient operation of the ultrafiltration system; by periodically calculating the membrane pollution degree value, the membrane pollution increasing trend can be tracked in real time, the cleaning time can be intervened and optimized in advance, excessive accumulation of membrane pollution is prevented, the influence on system operation is reduced, the operation cost is reduced, and frequent shutdown and cleaning difficulty increase caused by serious membrane pollution are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment in thermal power plants, and in particular to a fully automatic cleaning process for an ultrafiltration device. Background Art

[0002] With the rapid development of my country's economy, the demand for electricity continues to grow. As one of the main power generation methods, thermal power generation continues to expand in scale. However, a large amount of wastewater is generated during thermal power generation. If it is not properly handled, it will cause serious environmental pollution. Therefore, it is of great significance to develop efficient, economical and environmentally friendly water treatment technology for thermal power plants.

[0003] In the water treatment process of thermal power plants, the ultrafiltration system plays a vital role. It effectively removes suspended matter, colloids, bacteria and other impurities in the water through the principle of physical screening, provides high-quality water for the subsequent desalination process, and ensures the safe and stable operation of the boiler system. However, the ultrafiltration membrane will inevitably be contaminated during long-term operation, resulting in a decrease in membrane flux and an increase in operating pressure, which ultimately affects the system efficiency and service life.

[0004] Therefore, the development of efficient and environmentally friendly ultrafiltration system cleaning technology is of great significance for maintaining the stable operation of the ultrafiltration system, reducing operating costs, extending the service life of the membrane, and solving pipeline corrosion. Summary of the invention

[0005] In order to solve the problems in the background technology, the present invention proposes a fully automatic cleaning process for an ultrafiltration device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A fully automatic cleaning process for an ultrafiltration device, comprising an ultrafiltration device, a laminated filter, an ultrafiltration water tank, an ultrafiltration cleaning device, a reverse osmosis flushing water pump, an ultrafiltration device cleaning liquid inlet valve, a reverse osmosis flushing water pump, a reverse osmosis water tank and a dosing device; The inlet end of the ultrafiltration device is connected to the outlet end of the laminated filter, and the outlet end is connected to the inlet end of the ultrafiltration water tank; The inlet end of the ultrafiltration cleaning device is connected to the outlet of the reverse osmosis flushing water pump, and the outlet end is connected to the ultrafiltration device cleaning liquid inlet valve; The inlet end of the reverse osmosis flushing water pump is connected to the reverse osmosis water tank, and the outlet end is connected to the ultrafiltration cleaning device; The dosing device comprises a sodium hypochlorite metering box, a sodium hypochlorite metering pump, a liquid alkali metering box, a liquid alkali metering pump, a hydrochloric acid metering box, and a hydrochloric acid metering pump. The inlet end of the sodium hypochlorite metering pump is connected to the sodium hypochlorite metering box, and the outlet end is connected to the ultrafiltration cleaning device; the inlet end of the liquid alkali metering pump is connected to the liquid alkali metering box, and the outlet end is connected to the ultrafiltration cleaning device; the inlet end of the hydrochloric acid metering pump is connected to the hydrochloric acid metering box, and the outlet end is connected to the ultrafiltration cleaning device; During the cleaning process of the ultrafiltration device, the detection module inside the controller detects the inlet and output water pressure, flow rate, water quality, operating time and cleaning times of the ultrafiltration device, and then the analysis module inside the controller analyzes the detected data to determine the degree of membrane contamination, membrane contamination growth rate and remaining service life of the membrane, and then generates a corresponding execution signal, so that the execution module inside the controller executes the corresponding operation after receiving the corresponding execution signal.

[0007] Preferably, the ultrafiltration device includes a cleaning liquid inlet valve, an air inlet valve, a backwash upper discharge valve, a backwash lower discharge valve, a cleaning concentrated water reflux valve, a cleaning produced water reflux valve, a backwash inlet valve, and a produced water valve.

[0008] Preferably, the ultrafiltration cleaning device also includes an ultrafiltration cleaning water tank, an ultrafiltration cleaning water pump 1, an ultrafiltration cleaning water pump 2, a safety filter, a pneumatic valve of the safety filter outlet main pipe, a pneumatic isolation valve from reverse osmosis flushing water to the ultrafiltration cleaning water tank, and a pneumatic valve of the ultrafiltration cleaning water tank recirculation pipeline.

[0009] Preferably, the ultrafiltration cleaning device can be fully automatically programmed to operate during enhanced backwash A (CEB-A) cleaning, enhanced backwash B (CEB-B) cleaning, and recovery cleaning (CIP) of the ultrafiltration system.

[0010] Preferably, a detection module, an analysis module and an execution module are provided inside the controller of the ultrafiltration device; A detection module detects the inlet and outlet water pressure, flow rate, water quality, operating time and cleaning times of the ultrafiltration device, and transmits the detected data to the analysis module; The analysis module analyzes and processes the data transmitted by the detection module, calculates the influence of the detection data on the membrane pollution, determines whether the membrane pollution reaches the preset membrane pollution degree threshold, generates a pollution cleaning signal if it reaches it, and transmits the pollution cleaning signal to the execution module; detects the growth rate of membrane pollution, determines whether the membrane pollution will reach the preset ratio threshold after growth, generates a warning signal if it reaches it, and transmits the warning signal to the execution module; retrieves and analyzes various detection history data of the detection module during the operation of the ultrafiltration device, predicts the remaining service life of the membrane, determines whether the remaining service life reaches the preset remaining service life threshold, generates a membrane replacement signal if it reaches it, and transmits the membrane replacement signal to the execution module; The execution module receives the signal transmitted by the analysis module and then performs the corresponding operation.

[0011] Preferably, the analysis module performs the following steps to analyze the impact of the detection data on membrane fouling: S1: water inlet pressure is , the water production pressure is , pressure difference , the influence coefficient of the preset pressure difference on the membrane fouling degree is , then the influence of water pressure factors on the degree of membrane fouling ; S2: water inlet flow rate is , the water flow rate is , flow ratio , the influence coefficient of preset flow rate on membrane fouling degree is , the influence of flow factors on the degree of membrane fouling ; S3: Comprehensive water quality indicators , is turbidity, is the pollution index, is the organic matter content, and the influence coefficient of water quality on membrane fouling degree is preset as , then the influence of water quality factors on the degree of membrane fouling ; S4: running time is , the influence coefficient of preset operation time on membrane fouling degree is , then the influence of the operating time factor on the degree of membrane fouling ; S5: The number of cleaning times is , the time since the last cleaning is , the cleaning effect coefficient is , the comprehensive influence coefficient of preset cleaning on membrane fouling degree is , then the influence of cleaning factors on the degree of membrane fouling ; S6: Based on the above factors, the degree of membrane fouling , the membrane fouling degree is obtained Preset membrane fouling threshold For comparison, if , a pollution cleaning signal is generated and transmitted to the execution module; otherwise, the degree of membrane pollution is calculated. Preset membrane fouling threshold The difference , .

[0012] Preferably, the analysis module performs the following steps to analyze the growth of membrane fouling: K1: The degree of membrane pollution is measured at a set time interval. Calculate the value of The membrane fouling degree value is calculated The membrane pollution degree values ​​are sorted in the order of collection time, and a coordinate system of collection time and membrane pollution degree values ​​is established. The coordinate points are drawn in the coordinate system, and lines are connected. Then, the slope of the connecting line is calculated, and the connecting line with a slope greater than zero is marked. K2: Taking the current time point as the base point, if there is a line with a slope greater than zero within the set time period forward from the base point, the membrane pollution degree growth value corresponding to the slope of the line , calculate, if , it is determined that the membrane pollution has a tendency to reach the cleaning condition, and a secondary judgment of the trend is made. It is the value of the membrane pollution degree currently detected; K3: Calculation The average value of membrane fouling degree and standard deviation , to calculate the mean and standard deviation Establish the fluctuation range of calculated data ,right The membrane pollution degree values ​​that are not within the fluctuation range are marked as outliers, and the number of outliers a is counted. If the preset ratio threshold , it is determined that the calculated membrane contamination degree fluctuates greatly, a warning signal is generated, and the warning signal is transmitted to the execution module.

[0013] Preferably, the analysis module performs the following steps to analyze the remaining service life of the membrane: M1: Create a combined feature vector based on the data obtained above , the remaining service life of the membrane is established by linear regression model Model, is the intercept, is the coefficient of each feature, are the features in the feature vector, is the error term; M2: Use historical data to train the model and substitute the acquired historical data into the mean square error loss function , is the sample size, is the actual remaining membrane service life, The remaining service life of the membrane predicted by the model; the model parameters corresponding to the historical data are obtained through training with historical data ; M3: Root mean square error , mean absolute error , the calculated Value and The values ​​are compared with the preset thresholds of the corresponding items. If both are smaller than the preset thresholds of the corresponding items, the model prediction effect is judged to be good; otherwise, historical data is re-selected for model training. M4: During the operation of the ultrafiltration device, the current calculation feature vector is calculated using the real-time detected data and the trained model , and the current feature vector The input is into the trained model to predict the remaining service life of the membrane under the current circumstances; when the remaining service life of the membrane is less than the preset remaining service life threshold, a membrane replacement signal is generated and passed to the execution module.

[0014] Preferably, the steps of executing the operation by the execution module are as follows: N1: After receiving the pollution cleaning signal, perform the membrane cleaning operation; N2: After receiving the warning signal, the execution module transmits the pressure difference data between the inlet and product water of the ultrafiltration device to the analysis module. The analysis module compares the pressure difference data with the preset pressure difference threshold and calculates the membrane pollution degree growth value. and If there is a comparison between the two items that is greater than the preset threshold of the corresponding item, , it is determined that the membrane pollution is about to reach the cleaning condition, a pre-cleaning signal is generated, and the pre-cleaning signal is transmitted to the execution module; N3: After receiving the pre-cleaning signal, perform the membrane cleaning operation.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention adopts a fully automatic cleaning process to reduce the amount of manual operation; it has high reliability, can be fully automatic, operates safely and stably, reduces labor intensity, improves cleaning efficiency, and ultimately reduces the operation and maintenance costs of the ultrafiltration system; 2. The present invention can efficiently clean, restore the ultrafiltration membrane flux, and extend the life of the ultrafiltration membrane; 3. The present invention greatly reduces the total amount of various types of wastewater, can achieve a higher recovery rate, effectively reduce the water consumption of the whole plant, and reduce the total amount of wastewater in the whole plant, which has profound significance for water saving in thermal power plants; 4. The present invention greatly reduces the corrosion of the flushing device on the pipeline system; 5. The present invention uses a detection module to monitor multi-dimensional data such as inlet and outlet water pressure, flow rate, water quality, operating time and cleaning times in real time, and comprehensively calculates the degree of membrane contamination to ensure that cleaning is started before membrane contamination affects system performance, avoid aggravation of contamination, effectively restore membrane flux, ensure efficient operation of the ultrafiltration system, and extend the service life of the membrane; by regularly calculating the numerical value of the membrane contamination degree, drawing its curve over time and calculating the slope, the growth trend of membrane contamination can be tracked in real time, early intervention can be made, the cleaning time can be optimized, excessive accumulation of membrane contamination can be prevented, the impact on system operation can be reduced, operating costs can be reduced, and frequent shutdowns and increased cleaning difficulties caused by severe membrane contamination can be avoided; a combined feature vector is constructed using the acquired multi-factor data to predict the remaining service life of the membrane, so that the operator can know the service life of the membrane in advance, reasonably arrange the membrane replacement plan, prepare spare membrane components in advance, reduce the system downtime caused by sudden membrane failure, ensure the continuous and stable operation of the water treatment system of the thermal power plant, and avoid the waste of resources caused by premature replacement, thereby reducing maintenance costs.

[0016] In summary: The fully automatic cleaning process for an ultrafiltration device applied for in this patent has the advantages of high efficiency, mildness, environmental protection, and economy. It can effectively solve the problems existing in the prior art and provide guarantee for the safe and stable operation of the water treatment system of a thermal power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 The figure is a structural schematic diagram of a fully automatic cleaning process for an ultrafiltration device.

[0018] Attached Figure 2 It is the system flow chart of the present invention: Legend: 1. Cleaning liquid inlet valve; 2. Air inlet valve; 3. Backwash upper discharge valve; 4. Backwash lower discharge valve; 5. Cleaning concentrated water reflux valve; 6. Cleaning produced water reflux valve; 7. Backwash inlet valve; 8. Produced water valve; 9. Pneumatic isolation valve from reverse osmosis flushing water to ultrafiltration cleaning water tank; 10. Pneumatic valve for ultrafiltration cleaning water tank recirculation pipeline; 11. Pneumatic valve for safety filter outlet main pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 2, the present invention provides a technical solution: a fully automatic cleaning process for an ultrafiltration device, comprising an ultrafiltration device, a laminated filter, an ultrafiltration water tank, an ultrafiltration cleaning device, a reverse osmosis flushing water pump, an ultrafiltration device cleaning liquid inlet valve, a reverse osmosis flushing water pump, a reverse osmosis water tank and a dosing device; The inlet end of the ultrafiltration device is connected to the outlet end of the laminated filter, and the outlet end is connected to the inlet end of the ultrafiltration water tank; and the system startup water machine and backwashing of the ultrafiltration device can be fully automatically controlled, thereby improving the automation of the ultrafiltration device; The inlet end of the ultrafiltration cleaning device is connected to the outlet of the reverse osmosis flushing water pump, and the outlet end is connected to the ultrafiltration device cleaning liquid inlet valve; The inlet end of the reverse osmosis flushing water pump is connected to the reverse osmosis water tank, and the outlet end is connected to the ultrafiltration cleaning device; The dosing device comprises a sodium hypochlorite metering box, a sodium hypochlorite metering pump, a liquid alkali metering box, a liquid alkali metering pump, a hydrochloric acid metering box, and a hydrochloric acid metering pump. The inlet end of the sodium hypochlorite metering pump is connected to the sodium hypochlorite metering box, and the outlet end is connected to the ultrafiltration cleaning device; the inlet end of the liquid alkali metering pump is connected to the liquid alkali metering box, and the outlet end is connected to the ultrafiltration cleaning device; the inlet end of the hydrochloric acid metering pump is connected to the hydrochloric acid metering box, and the outlet end is connected to the ultrafiltration cleaning device; the start and stop of the metering pump, the preparation of the drug solution, and the circulation of the solution box in the dosing device can all be fully automatically program-controlled, thereby improving the automation of the dosing device and facilitating accurate and rapid addition of drugs to water.

[0021] In the present invention, the ultrafiltration device includes a cleaning liquid inlet valve 1, an air inlet valve 2, a backwash upper discharge valve 3, a backwash lower discharge valve 4, a cleaning concentrated water reflux valve 5, a cleaning produced water reflux valve 6, a backwash inlet valve 7, and a produced water valve 8.

[0022] In the present invention, the ultrafiltration cleaning device also includes an ultrafiltration cleaning water tank, an ultrafiltration cleaning water pump 1, an ultrafiltration cleaning water pump 2, a safety filter, a safety filter outlet main pipe pneumatic valve 11, a reverse osmosis flushing water to ultrafiltration cleaning water tank pneumatic isolation valve 9, and an ultrafiltration cleaning water tank recirculation pipeline pneumatic valve 10.

[0023] In the present invention, the ultrafiltration cleaning device can be fully automatically program-controlled to operate during enhanced backwash A (CEB-A) cleaning, enhanced backwash B (CEB-B) cleaning, and recovery cleaning (CIP) of the ultrafiltration system.

[0024] Among them, the fully automatic cleaning process system of the ultrafiltration device can run fully automatically. When you click the "Start" button, you will enter the "Ultrafiltration Start Sequence Control" interface, click Start, and the ultrafiltration system will automatically start running according to the set program. Automatically open the ultrafiltration water production pneumatic door and the ultrafiltration inlet pneumatic door, open the selected clean water pump outlet electric door, start the clean water pump, and run it for 3600 seconds (can be set); when the ultrafiltration system runs for 3600 seconds, it will automatically enter backwashing; After backwashing is started, it automatically enters air washing; stop the clean water pump, close the clean water pump outlet electric door, ultrafiltration inlet pneumatic door, and ultrafiltration water production pneumatic door, open the ultrafiltration backwash upper discharge pneumatic door and ultrafiltration air inlet pneumatic door, and air wash for 30 seconds; air washing and backwashing; open the ultrafiltration backwash inlet pneumatic door, put the ultrafiltration backwash water pump into use, and perform air backwashing for 30 seconds; emptying: close the ultrafiltration air inlet pneumatic door, stop the ultrafiltration backwash water pump, close the ultrafiltration backwash inlet pneumatic door, open the ultrafiltration backwash lower discharge pneumatic door, and empty for 40 seconds; forward washing: close the ultrafiltration backwash lower discharge pneumatic door, open the ultrafiltration inlet pneumatic door and clean water pump outlet electric door, put the clean water pump into operation, and perform forward washing for 60 seconds; return to operation: open the ultrafiltration water production pneumatic door, close the ultrafiltration backwash upper discharge pneumatic door, open the ultrafiltration inlet pneumatic door, the ultrafiltration device continues to be put into operation and continues to produce water.

[0025] When the normal backwashing times reach 47 times, it will automatically enter enhanced backwash A (CEB-A). CEB-A has two cleaning modes: "sodium hypochlorite" or "sodium hypochlorite + alkali". The program-controlled automatic stop of the clean water pump, the ultrafiltration water inlet gate, and the ultrafiltration water production gate are closed; the ultrafiltration cleaning water tank water supply pneumatic gate is opened, and the reverse osmosis flushing water pump is started. When the ultrafiltration cleaning water tank liquid level reaches 0.9m (adjustable), the reverse osmosis flushing water pump is stopped, and the ultrafiltration cleaning water tank water supply pneumatic gate is closed after 15 seconds. The ultrafiltration sodium hypochlorite dosing solenoid valve is opened, and the sodium hypochlorite metering pump is started for 20 seconds (adjustable) and then stopped. The concentration of the prepared sodium hypochlorite solution is about 250ppm. If the "sodium hypochlorite + alkali" cleaning mode is selected, the ultrafiltration liquid alkali dosing solenoid valve is opened, and the liquid alkali metering pump is started. The pH of the dosing control solution is 11-12. Open the recirculation pneumatic gate of the ultrafiltration cleaning water tank, start the preselected ultrafiltration cleaning water pump, the frequency is 42Hz (settable), and the ultrafiltration cleaning water pump is stopped after circulating for 5 minutes (settable), and the ultrafiltration cleaning water tank recirculation pneumatic gate is closed. Open the ultrafiltration backwash lower discharge pneumatic gate and the ultrafiltration backwash upper discharge pneumatic gate, and close the ultrafiltration backwash lower discharge pneumatic gate and the ultrafiltration backwash upper discharge pneumatic gate after draining for 60 seconds (settable). Open the ultrafiltration cleaning water production pneumatic gate, the ultrafiltration cleaning concentrated water outlet pneumatic gate, the ultrafiltration cleaning device water production pneumatic gate, and the ultrafiltration cleaning inlet pneumatic gate. Start the preselected ultrafiltration cleaning water pump, the frequency is 42Hz (settable), and the ultrafiltration cleaning water pump is stopped after circulating for 15 minutes (settable). Close the ultrafiltration cleaning device water production pneumatic gate, the ultrafiltration cleaning inlet pneumatic gate, the ultrafiltration cleaning water production pneumatic gate, and the ultrafiltration cleaning concentrated water outlet pneumatic gate. Open the exhaust pneumatic valve at the bottom of the ultrafiltration cleaning water tank to drain the remaining liquid in the ultrafiltration cleaning water tank (set the timer to 360 seconds). When the cleaning water tank is drained, close the exhaust pneumatic valve at the bottom of the ultrafiltration cleaning water tank and open the pneumatic valve for replenishing water in the ultrafiltration cleaning water tank. Start the reverse osmosis flushing water pump. When the liquid level reaches 0.9m (adjustable), stop the reverse osmosis flushing water pump. After 15 seconds, close the pneumatic valve for replenishing water in the ultrafiltration cleaning water tank. Open the pneumatic valve for ultrafiltration cleaning water production, the pneumatic valve for ultrafiltration cleaning concentrated water outlet, the pneumatic valve for ultrafiltration cleaning device water production, and the pneumatic valve for ultrafiltration cleaning inlet. Start the preselected ultrafiltration cleaning water pump at a frequency of 42Hz (adjustable). After circulating for 5 minutes (adjustable), stop the ultrafiltration cleaning water pump. Close the pneumatic valve for ultrafiltration cleaning device water production, the pneumatic valve for ultrafiltration cleaning inlet, the pneumatic valve for ultrafiltration cleaning water production, and the pneumatic valve for ultrafiltration cleaning concentrated water outlet. Open the exhaust pneumatic valve at the bottom of the ultrafiltration cleaning water tank to drain the remaining liquid in the ultrafiltration cleaning water tank. After setting the timer to 380 seconds (adjustable), close the exhaust pneumatic valve at the bottom of the ultrafiltration cleaning water tank. Open the upper exhaust pneumatic valve for ultrafiltration backwashing, open the ultrafiltration water inlet gate (the opening is set to 60%, adjustable), start the clean water pump at the forward wash frequency, and after running for 3 minutes, the system will restart water production.

[0026] When enhanced backwash A (CEB-A) reaches 6 times, it will automatically enter enhanced backwash B (CEB-B). The clean water pump is automatically stopped by program control, the ultrafiltration water inlet gate is closed, and the ultrafiltration water production gate is closed. The ultrafiltration cleaning water tank water supply pneumatic gate is opened, and the reverse osmosis flushing water pump is started. When the ultrafiltration cleaning water tank liquid level reaches 0.9m (adjustable), the reverse osmosis flushing water pump is stopped. After 15 seconds, the ultrafiltration cleaning water tank water supply pneumatic gate is closed, and the ultrafiltration cleaning water tank recirculation pneumatic gate is opened. The ultrafiltration hydrochloric acid dosing solenoid valve is opened, and the hydrochloric acid metering pump is started and stopped after 20 seconds (adjustable). The pH of the dosing solution is controlled to be 2.0-2.5. The pre-selected ultrafiltration cleaning water pump is started, with a frequency of 42Hz (adjustable), and the ultrafiltration cleaning water pump is stopped after circulating for 5 minutes (adjustable), and the ultrafiltration cleaning water tank recirculation pneumatic gate is closed. Open the UF backwash lower discharge pneumatic door and the UF backwash upper discharge pneumatic door, and close the UF backwash lower discharge pneumatic door and the UF backwash upper discharge pneumatic door after draining for 60 seconds (settable). Open the UF cleaning water production pneumatic door, the UF cleaning concentrated water outlet pneumatic door, the UF cleaning device water production pneumatic door, and the UF cleaning inlet pneumatic door. Start the preselected UF cleaning water pump, the frequency is 42Hz (settable), and stop the UF cleaning water pump after circulating for 15 minutes (settable). Close the UF cleaning device water production pneumatic door, the UF cleaning inlet pneumatic door, the UF cleaning water production pneumatic door, and the UF cleaning concentrated water outlet pneumatic door. Open the UF cleaning water tank bottom exhaust pneumatic door to empty the remaining liquid in the UF cleaning water tank (the timing is set to 380 seconds, which can be set). When the cleaning water tank is drained, close the UF cleaning water tank bottom exhaust pneumatic door and open the UF cleaning water tank water replenishment pneumatic door. Start the reverse osmosis flushing water pump. When the liquid level reaches 0.9m (settable), stop the reverse osmosis flushing water pump. After 15 seconds, close the ultrafiltration cleaning water tank water replenishment pneumatic door. Open the ultrafiltration cleaning water production pneumatic door, ultrafiltration cleaning concentrated water outlet pneumatic door, ultrafiltration cleaning device water production pneumatic door, and ultrafiltration cleaning inlet pneumatic door. Start the pre-selected ultrafiltration cleaning water pump, frequency 42Hz (settable), and stop the ultrafiltration cleaning water pump after 5 minutes of circulation (settable). Close the ultrafiltration cleaning device water production pneumatic door, ultrafiltration cleaning inlet pneumatic door, ultrafiltration cleaning water production pneumatic door, and ultrafiltration cleaning concentrated water outlet pneumatic door. Open the ultrafiltration cleaning water tank bottom exhaust pneumatic door, empty the remaining liquid in the ultrafiltration cleaning water tank (the timing is set to 380 seconds, which can be set), and then close the ultrafiltration cleaning water tank bottom exhaust pneumatic door. Open the upper discharge pneumatic door of the ultrafiltration backwash, open the ultrafiltration water inlet door (the opening is set to 60%, which can be set), start the clean water pump at the forward wash frequency, and after running for 3 minutes, the system starts to make water again.

[0027] When the pressure difference between the inlet and product water of the ultrafiltration device reaches 0.08MPa, the ultrafiltration device needs to be chemically cleaned. When you click the "CIP" button, enter the "CIP Sequential Control" interface, click Start, and you can automatically enter the restorative cleaning according to the set program. After the restorative cleaning program is started, enter the replacement: there are two cleaning modes: "sodium hypochlorite chemical cleaning" or "acid chemical cleaning". The program automatically stops the clean water pump, closes the ultrafiltration water inlet gate, and closes the ultrafiltration product water gate. Open the ultrafiltration cleaning water tank water replenishment pneumatic gate, start the reverse osmosis flushing water pump, and when the ultrafiltration cleaning water tank liquid level reaches 0.9m (settable), stop the reverse osmosis flushing water pump, and close the ultrafiltration cleaning water tank water replenishment pneumatic gate after 15 seconds. If the "sodium hypochlorite chemical cleaning" mode is selected, the ultrafiltration sodium hypochlorite dosing solenoid valve is opened, the sodium hypochlorite metering pump is started for 40 seconds (settable) and then stopped, and the concentration of the sodium hypochlorite solution is prepared to be about 500ppm; the ultrafiltration liquid alkali dosing solenoid valve is opened, the liquid alkali metering pump is started, and the pH of the dosing solution is controlled to be 11-12. If the "acid chemical cleaning" mode is selected, the ultrafiltration hydrochloric acid dosing solenoid valve is opened, the hydrochloric acid metering pump is started, and the pH of the dosing solution is controlled to be 2.0-2.5. The ultrafiltration cleaning water tank recirculation pneumatic valve is opened, and the preselected ultrafiltration cleaning water pump is started, with a frequency of 42Hz (settable), and the ultrafiltration cleaning water pump is stopped after circulating for 5 minutes (settable), and the ultrafiltration cleaning water tank recirculation pneumatic valve is closed. Open the upper discharge pneumatic door of ultrafiltration backwash, open the pneumatic door of ultrafiltration cleaning inlet, start the ultrafiltration cleaning water pump, and replace for 40 seconds; circulation: open the pneumatic door of ultrafiltration cleaning water production, open the pneumatic door of ultrafiltration cleaning concentrated water, close the upper discharge pneumatic door of ultrafiltration backwash, and circulate for 10 minutes; soak: stop the ultrafiltration cleaning water pump, close the pneumatic door of ultrafiltration cleaning inlet, close the pneumatic door of ultrafiltration cleaning water production, close the pneumatic door of ultrafiltration cleaning concentrated water, and soak for 5 hours; circulation: open the pneumatic door of ultrafiltration cleaning concentrated water, open the pneumatic door of ultrafiltration cleaning water production, Open the UF cleaning inlet pneumatic door, start the UF cleaning water pump, and circulate for 5 minutes; air washing: stop the UF cleaning water pump, close the UF cleaning inlet pneumatic door, close the UF cleaning concentrated water pneumatic door, close the UF cleaning water pneumatic door, open the UF backwash upper discharge pneumatic door, open the UF air inlet pneumatic door, and air wash for 30 seconds; air washing + backwashing: open the UF backwash inlet pneumatic door, start the UF backwash water pump, and continue for 30 seconds; rinsing: close the UF air inlet pneumatic door, open the UF backwash lower discharge pneumatic door, and continue for 1 minute. Emptying: stop the UF backwash water pump, close the UF backwash inlet pneumatic door, and continue for 40 seconds; positive washing: close the UF backwash lower discharge pneumatic door, open the UF inlet pneumatic door, open the selected cleaning water pump outlet electric door, start the clean water pump, and continue for 3 minutes; stop the clean water pump, close the selected cleaning water pump outlet electric door, close the UF inlet pneumatic door, and close the UF backwash upper discharge pneumatic door.

[0028] The ultrafiltration system backwash, enhanced backwash A (CEB-A), enhanced backwash B (CEB-B), and restorative cleaning (CIP) are set with program-controlled logic interlocking, and only one of the four ultrafiltration sets can be carried out.

[0029] The ultrafiltration system device can realize the automatic circulation water production of a single set of ultrafiltration program control by inputting the "circulation input" in the backwash sequence control, and can realize the automatic shutdown of a single set of ultrafiltration program control by inputting the "circulation removal" in the backwash sequence control. The ultrafiltration system interface can realize the automatic sorting of four sets of ultrafiltration circulation single set cleaning. Input "re-sorting" to realize the circulation of another set of ultrafiltration program control. Input "sorting removal" to realize the manual circulation of four sets of ultrafiltration program control.

[0030] The controller of the ultrafiltration device is internally provided with a detection module, an analysis module and an execution module; The water inlet pressure is , the water production pressure is , pressure difference , the influence coefficient of the preset pressure difference on the membrane fouling degree is , then the influence of water pressure factors on the degree of membrane fouling ; The water flow rate is , the water flow rate is , flow ratio , the influence coefficient of preset flow rate on membrane fouling degree is , the influence of flow factors on the degree of membrane fouling ; Turbidity , Value, organic matter content Affects the quality of water, comprehensive water quality indicators , the influence coefficient of water quality on membrane fouling degree is preset as , then the influence of water quality factors on the degree of membrane fouling ; The running time is , the influence coefficient of preset operation time on membrane fouling degree is , then the influence of the operating time factor on the degree of membrane fouling ; Cleaning times , the time since the last cleaning is , the cleaning effect coefficient is , The value range is , 1 means the cleaning effect is excellent and the membrane pollution is basically restored; 0 means the cleaning has no effect. The comprehensive influence coefficient of cleaning on the degree of membrane pollution is preset as , then the influence of cleaning factors on the degree of membrane fouling ; Taking all the above factors into consideration, the degree of membrane fouling , the membrane fouling degree is obtained Preset membrane fouling threshold For comparison, if , a pollution cleaning signal is generated and transmitted to the execution module; otherwise, the degree of membrane pollution is calculated. Preset membrane fouling threshold The difference , .

[0031] Create a combined feature vector based on the data obtained above , the remaining service life of the membrane is established by linear regression model Model, is the intercept, is the coefficient of each feature, are the features in the feature vector, is the error term; use historical data to train the model and substitute the acquired historical data into the mean square error loss function , is the sample size, is the actual remaining membrane service life, The remaining service life of the membrane predicted by the model; the model parameters corresponding to the historical data are obtained through training with historical data ; Evaluate model performance, root mean square error , mean absolute error , the calculated Value and The values ​​are compared with the preset thresholds of the corresponding items. If both are smaller than the preset thresholds of the corresponding items, the model prediction effect is judged to be good; otherwise, historical data is re-selected for model training. During the operation of the ultrafiltration device, the current calculation feature vector is calculated through the real-time detected data and the trained model , and the current feature vector The input is into the trained model to predict the remaining service life of the membrane under the current circumstances; when the remaining service life of the membrane is less than the preset remaining service life threshold, a membrane replacement signal is generated and passed to the execution module.

[0032] The degree of membrane fouling is monitored at set intervals. Calculate the value of The membrane fouling degree value is calculated The membrane pollution degree values ​​are sorted in the order of collection time, and a coordinate system of collection time and membrane pollution degree values ​​is established. The coordinate points are drawn in the coordinate system, and lines are connected. Then the slope of the connecting line is calculated, and the connecting line with a slope greater than zero is marked; taking the current time point as the base point, if there is a connecting line with a slope greater than zero within the set time period forward from the base point, the membrane pollution degree growth value corresponding to the connecting line slope is calculated. Calculate if , it is determined that the membrane pollution has a tendency to reach the cleaning condition, and a secondary judgment of the trend is made. It is the value of the membrane pollution degree currently detected; calculate The average value of membrane fouling degree and standard deviation , to calculate the mean and standard deviation Establish the fluctuation range of calculated data ,right The membrane pollution degree values ​​that are not within the fluctuation range are marked as outliers, and the number of outliers a is counted. If the preset ratio threshold , it is determined that the calculated membrane contamination degree value fluctuates greatly, a warning signal is generated, and the warning signal is transmitted to the execution module; After receiving the pollution cleaning signal, the execution module performs the membrane cleaning operation; after receiving the warning signal, the execution module transmits the pressure difference data between the inlet and outlet water of the ultrafiltration device to the analysis module, and the analysis module compares the pressure difference data with the preset pressure difference threshold value to calculate the membrane pollution degree growth value. and If there is a comparison between the two items that is greater than the preset threshold of the corresponding item, , it is determined that the membrane contamination is about to reach the cleaning condition, a pre-cleaning signal is generated, and the pre-cleaning signal is transmitted to the execution module.

[0033] Working principle: Connect tap water to this system, and add chemicals to strengthen the washing raw materials of sodium hypochlorite, liquid alkali, and hydrochloric acid. The ultrafiltration system is fully automatic in water production and operation, which can effectively remove particles, colloids, bacteria, heat sources and organic matter in the water. The ultrafiltration system is fully automatic in backwashing, which can effectively remove pollutants and blockages on the membrane surface, restore the membrane flux, improve the filtration efficiency, reduce membrane pollution and scaling, reduce the risk of membrane damage, and extend its service life. The ultrafiltration system is fully automatic in dosing and strengthening washing. Through the dissolution, oxidation or dispersion of chemical agents, it can effectively remove organic matter, colloids, microorganisms and other pollutants that are difficult to remove by ordinary backwashing. It can more thoroughly remove the pollution layer on the membrane surface, significantly restore the membrane flux, and improve the filtration efficiency of the system.

[0034] The fully automatic backwashing of the ultrafiltration system, coupled with the fully automatic dosing enhanced washing process system, can more thoroughly remove pollutants on the surface of the ultrafiltration membrane through the synergistic effect of chemical agents, significantly restore membrane flux, extend membrane life, improve water quality, and reduce operating costs. Reasonable use of dosing enhanced washing can effectively deal with complex water quality and high pollution loads, and maintain the efficient and stable operation of the ultrafiltration system. It can restore membrane performance more quickly, extend the time of efficient operation of the system, reduce system downtime, improve operating efficiency, and improve water quality.

[0035] After the tap water passes through the laminated filter, it is filtered by the ultrafiltration system and then enters the ultrafiltration water tank. The startup sequence control can make the ultrafiltration system automatically enter operation according to the set program. After running for 3600 seconds (settable), it automatically enters backwashing. The backwash sequence control can make the ultrafiltration system automatically enter operation according to the set program and automatically perform the backwashing process. When the normal backwashing times reach 47 times, it automatically enters enhanced backwash A (CEB-A) and automatically performs the enhanced backwash A process. When enhanced backwash A (CEB-A) reaches 6 times, it automatically enters enhanced backwash B (CEB-B) and automatically performs the enhanced backwash B process. When the pressure difference between the inlet and product water of the ultrafiltration device reaches 0.08MPa, the ultrafiltration system can enter the restorative cleaning and the restorative cleaning (CIP) process can be automatically performed. The start and stop of all equipment and the switch of valves are fully automatically controlled by the DCS system program, effectively realizing the water production, backwashing, enhanced cleaning and restorative cleaning of the ultrafiltration system.

[0036] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fully automatic cleaning process for an ultrafiltration device, characterized in that: It includes an ultrafiltration device, a laminated filter, an ultrafiltration water tank, an ultrafiltration cleaning device, a reverse osmosis flushing water pump, an ultrafiltration device cleaning liquid inlet valve, a reverse osmosis water tank and a dosing device; The inlet end of the ultrafiltration device is connected to the outlet end of the laminated filter, and the outlet end is connected to the inlet end of the ultrafiltration water tank; The inlet end of the ultrafiltration cleaning device is connected to the outlet of the reverse osmosis flushing water pump, and the outlet end is connected to the ultrafiltration device cleaning liquid inlet valve; The inlet end of the reverse osmosis flushing water pump is connected to the reverse osmosis water tank, and the outlet end is connected to the ultrafiltration cleaning device; The dosing device comprises a sodium hypochlorite metering box, a sodium hypochlorite metering pump, a liquid alkali metering box, a liquid alkali metering pump, a hydrochloric acid metering box, and a hydrochloric acid metering pump. The inlet end of the sodium hypochlorite metering pump is connected to the sodium hypochlorite metering box, and the outlet end is connected to the ultrafiltration cleaning device; the inlet end of the liquid alkali metering pump is connected to the liquid alkali metering box, and the outlet end is connected to the ultrafiltration cleaning device; the inlet end of the hydrochloric acid metering pump is connected to the hydrochloric acid metering box, and the outlet end is connected to the ultrafiltration cleaning device; During the cleaning process of the ultrafiltration device, the detection module inside the controller detects the inlet and output water pressure, flow rate, water quality, operating time and cleaning times of the ultrafiltration device, and then the analysis module inside the controller analyzes the detected data to determine the degree of membrane contamination, membrane contamination growth rate and remaining service life of the membrane, and then generates a corresponding execution signal, so that the execution module inside the controller executes the corresponding operation after receiving the corresponding execution signal.

2. The fully automatic cleaning process of an ultrafiltration device according to claim 1, characterized in that: The ultrafiltration device comprises a cleaning liquid inlet valve (1), an air inlet valve (2), a backwash upper discharge valve (3), a backwash lower discharge valve (4), a cleaning concentrated water return valve (5), a cleaning produced water return valve (6), a backwash inlet valve (7), and a produced water valve (8).

3. The fully automatic cleaning process of an ultrafiltration device according to claim 2, characterized in that: The ultrafiltration cleaning device also includes an ultrafiltration cleaning water tank, an ultrafiltration cleaning water pump 1, an ultrafiltration cleaning water pump 2, a safety filter, a safety filter outlet main pipe pneumatic valve (11), a reverse osmosis flushing water to ultrafiltration cleaning water tank pneumatic isolation valve (9), and an ultrafiltration cleaning water tank recirculation pipeline pneumatic valve (10).

4. The fully automatic cleaning process of an ultrafiltration device according to claim 3, characterized in that: The ultrafiltration cleaning device can be fully automatically programmed to operate during enhanced backwash A (CEB-A), enhanced backwash B (CEB-B) and restorative cleaning (CIP) of the ultrafiltration system.

5. The fully automatic cleaning process of an ultrafiltration device according to claim 1, characterized in that: The controller of the ultrafiltration device is internally provided with a detection module, an analysis module and an execution module; A detection module detects the inlet and outlet water pressure, flow rate, water quality, operating time and cleaning times of the ultrafiltration device, and transmits the detected data to the analysis module; The analysis module analyzes and processes the data transmitted by the detection module, calculates the influence of the detection data on the membrane pollution, determines whether the membrane pollution reaches the preset membrane pollution degree threshold, generates a pollution cleaning signal if it reaches it, and transmits the pollution cleaning signal to the execution module; detects the growth rate of membrane pollution, determines whether the membrane pollution will reach the preset ratio threshold after growth, generates a warning signal if it reaches it, and transmits the warning signal to the execution module; retrieves and analyzes various detection history data of the detection module during the operation of the ultrafiltration device, predicts the remaining service life of the membrane, determines whether the remaining service life reaches the preset remaining service life threshold, generates a membrane replacement signal if it reaches it, and transmits the membrane replacement signal to the execution module; The execution module receives the signal transmitted by the analysis module and then performs the corresponding operation.

6. The fully automatic cleaning process of an ultrafiltration device according to claim 5, characterized in that: The analysis module analyzes the impact of test data on membrane fouling in the following steps: S1: water inlet pressure is , the water production pressure is , pressure difference , the influence coefficient of the preset pressure difference on the membrane fouling degree is , then the influence of water pressure factors on the degree of membrane fouling ; S2: water inlet flow rate is , the water flow rate is , flow ratio , the influence coefficient of preset flow rate on membrane fouling degree is , the influence of flow factors on the degree of membrane fouling ; S3: Comprehensive water quality indicators , is turbidity, is the pollution index, is the organic matter content, and the influence coefficient of water quality on membrane fouling degree is preset as , then the influence of water quality factors on the degree of membrane fouling ; S4: running time is , the influence coefficient of preset operation time on membrane fouling degree is , then the influence of the operating time factor on the degree of membrane fouling ; S5: The number of cleaning times is , the time since the last cleaning is , the cleaning effect coefficient is , the comprehensive influence coefficient of preset cleaning on membrane fouling degree is , then the influence of cleaning factors on the degree of membrane fouling ; S6: Based on the above factors, the degree of membrane fouling , the membrane fouling degree With the preset membrane fouling threshold For comparison, if , a pollution cleaning signal is generated and transmitted to the execution module; otherwise, the degree of membrane pollution is calculated. With the preset membrane fouling threshold The difference , .

7. The fully automatic cleaning process of an ultrafiltration device according to claim 6, characterized in that: The analysis module performs the following steps to analyze membrane fouling growth: K1: The degree of membrane pollution is measured at a set time interval. Calculate the value of The membrane fouling degree value is calculated The membrane pollution degree values ​​are sorted in the order of collection time, and a coordinate system of collection time and membrane pollution degree values ​​is established. The coordinate points are drawn in the coordinate system, and lines are connected. Then, the slope of the connecting line is calculated, and the connecting line with a slope greater than zero is marked. K2: Taking the current time point as the base point, if there is a line with a slope greater than zero within the set time period forward from the base point, the membrane pollution degree growth value corresponding to the slope of the line Calculate if , it is determined that the membrane pollution has a tendency to reach the cleaning condition, and a secondary judgment of the trend is made. It is the value of the membrane pollution degree currently detected; K3: Calculation The average value of membrane fouling degree and standard deviation , to calculate the mean and standard deviation Establish the fluctuation range of calculated data ,right The membrane pollution degree values ​​that are not within the fluctuation range are marked as outliers, and the number of outliers a is counted. If the preset ratio threshold , it is determined that the calculated membrane contamination degree fluctuates greatly, a warning signal is generated, and the warning signal is transmitted to the execution module.

8. The fully automatic cleaning process of an ultrafiltration device according to claim 7, characterized in that: The analysis module analyzes the remaining service life of the membrane in the following steps: M1: Create a combined feature vector based on the data obtained above , the remaining service life of the membrane is established by linear regression model Model, is the intercept, is the coefficient of each feature, are the features in the feature vector, is the error term; M2: Use historical data to train the model and substitute the acquired historical data into the mean square error loss function , is the sample size, is the actual remaining membrane service life, The remaining service life of the membrane predicted by the model; the model parameters corresponding to the historical data are obtained through training with historical data ; M3: Root mean square error , mean absolute error , the calculated Value and The values ​​are compared with the preset thresholds of the corresponding items. If both are smaller than the preset thresholds of the corresponding items, the model prediction effect is judged to be good; otherwise, historical data is re-selected for model training. M4: During the operation of the ultrafiltration device, the current calculation feature vector is calculated using the real-time detected data and the trained model , and the current feature vector The input is into the trained model to predict the remaining service life of the membrane under the current circumstances; when the remaining service life of the membrane is less than the preset remaining service life threshold, a membrane replacement signal is generated and passed to the execution module.

9. The fully automatic cleaning process of an ultrafiltration device according to claim 8, characterized in that: The steps for executing the module to perform operations are as follows: N1: After receiving the pollution cleaning signal, perform the membrane cleaning operation; N2: After receiving the warning signal, the execution module transmits the pressure difference data between the inlet and product water of the ultrafiltration device to the analysis module. The analysis module compares the pressure difference data with the preset pressure difference threshold and calculates the membrane pollution degree growth value. and If there is a comparison between the two items that is greater than the preset threshold of the corresponding item, , it is determined that the membrane pollution is about to reach the cleaning condition, a pre-cleaning signal is generated, and the pre-cleaning signal is transmitted to the execution module; N3: After receiving the pre-cleaning signal, perform the membrane cleaning operation.

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