Desalination station reverse osmosis membrane monitoring system and monitoring method

Abstract

The present invention relates to the field of control, and discloses a reverse osmosis membrane monitoring system and a monitoring method for a desalted water station, including: testing a reverse osmosis module, obtaining the relationship between the current water inlet pressure and the water outlet flow rate, obtaining the reverse osmosis attenuation of the reverse osmosis membrane according to the current water inlet pressure and the water outlet flow rate relationship, obtaining the relationship between the current rotation speed of the high-pressure pump and the water inlet pressure, obtaining the performance attenuation of the high-pressure pump, sending the current relationship between the rotation speed of the high-pressure pump and the water inlet pressure relationship to a correction module, the correction module obtains the compensated high-pressure pump rotation speed under the same water inlet pressure, and obtains the corrected relationship between the water inlet pressure and the water outlet flow rate according to the obtained reverse osmosis attenuation; and controlling the reverse osmosis module according to the obtained corrected relationship between the water inlet pressure and the water outlet flow rate. Through the present invention, the intelligent control method can timely discover and solve potential problems through real-time monitoring and data analysis, and prevent the occurrence of system failures.

Description

Technical Field

[0001] The invention relates to the field of control, in particular to a reverse osmosis membrane monitoring system and a monitoring method for a desalted water station. Background Art

[0002] In desalination water stations, reverse osmosis technology, as the core treatment process, plays a vital role in water purification and salt removal. However, as the operating time increases, the performance of the reverse osmosis membrane will gradually decline due to factors such as pollution and aging, which is manifested as an increase in reverse osmosis attenuation, that is, a decrease in the outlet flow rate under the same inlet pressure, which directly affects the desalination efficiency and system stability.

[0003] Traditionally, monitoring the performance of reverse osmosis membranes relies on regular manual testing or simple flow monitoring. These methods often lag behind actual performance changes and are difficult to accurately assess the actual state of the membrane, leading to problems such as untimely or excessive maintenance. At the same time, as a key device driving the reverse osmosis process, the performance degradation of the high-pressure pump will also affect the overall efficiency of the system, but the existing technology lacks an effective dynamic compensation mechanism to timely adjust the working state of the high-pressure pump to adapt to changes in membrane performance. Summary of the invention

[0004] The object of the present invention is to overcome the deficiencies of the prior art and provide a method for monitoring a reverse osmosis membrane in a desalination station, comprising the following steps:

[0005] Step 1: Test the reverse osmosis module to obtain the relationship between the current water inlet pressure and the water outlet flow rate. According to the relationship between the current water inlet pressure and the water outlet flow rate, obtain the reverse osmosis attenuation of the reverse osmosis membrane. If the reverse osmosis attenuation is greater than the set attenuation threshold, replace the reverse osmosis membrane. Otherwise, the reverse osmosis membrane performance is normal, and enter step 2.

[0006] Step 2: Obtain the relationship between the current rotation speed of the high-pressure pump and the water inlet pressure, and obtain the performance attenuation of the high-pressure pump according to the relationship between the initial rotation speed of the high-pressure pump and the water inlet pressure, and then proceed to step 3;

[0007] Step 3: Send the current relationship between the high-pressure pump speed and the water inlet pressure to the correction module. The correction module compensates the high-pressure pump according to the attenuation of the high-pressure pump performance to obtain the compensated high-pressure pump speed under the same water inlet pressure. Send the obtained compensated relationship between the high-pressure pump speed and the water inlet pressure to the high-pressure pump control module to control the high-pressure pump, and then enter step 4;

[0008] Step 4, obtaining a corrected relationship between inlet water pressure and outlet water flow rate according to the obtained reverse osmosis attenuation and the compensated relationship between the high-pressure pump speed and the inlet water pressure;

[0009] Step 5: Control the reverse osmosis module according to the corrected relationship between the water inlet pressure and the water outlet flow rate.

[0010] Further, the reverse osmosis module is tested to obtain the relationship between the inlet pressure and the outlet flow rate, and the reverse osmosis attenuation of the reverse osmosis membrane is obtained according to the relationship between the inlet pressure and the outlet flow rate, including:

[0011] The water pressure on the inlet side of the reverse osmosis membrane and the outlet flow rate on the outlet side of the reverse osmosis membrane are obtained to obtain the relationship between the current inlet pressure and the outlet flow rate; based on the relationship between the standard inlet pressure and the outlet flow rate, the outlet flow rate difference under the same inlet pressure is obtained, and the outlet flow rate difference under the same inlet pressure is the reverse osmosis attenuation of the reverse osmosis membrane.

[0012] Furthermore, the relationship between the current rotation speed of the high-pressure pump and the water inlet pressure is obtained, and the performance attenuation of the high-pressure pump is obtained according to the relationship between the initial rotation speed of the high-pressure pump and the water inlet pressure, including:

[0013] According to the relationship between the current speed of the high-pressure pump and the water inlet pressure, the speed difference between the current speed of the high-pressure pump and the initial speed of the high-pressure pump under the same water inlet pressure is obtained. The ratio of the speed difference to the initial speed of the high-pressure pump is the performance attenuation of the high-pressure pump.

[0014] Furthermore, the relationship between the current high-pressure pump speed and the water inlet pressure is sent to the correction module, and the correction module compensates the high-pressure pump according to the attenuation of the high-pressure pump performance to obtain the compensated high-pressure pump speed under the same water inlet pressure, including:

[0015] The sum of the speed difference and the initial speed is the compensated high-pressure pump speed under the water inlet pressure corresponding to the initial speed, that is, the compensated high-pressure pump speed under the same water inlet pressure.

[0016] Furthermore, the corrected relationship between the inlet pressure and the outlet flow rate is obtained based on the reverse osmosis attenuation obtained and the compensated relationship between the high-pressure pump speed and the inlet pressure, including:

[0017] The corrected outlet flow rate is obtained based on the reverse osmosis attenuation of the obtained inlet water pressure and the sum of the outlet flow rate of the standard outlet water flow rate of the corresponding inlet water pressure. The corresponding corrected inlet water pressure is obtained based on the corrected outlet water flow rate, and the management of the corrected inlet water pressure and the standard outlet water flow rate is obtained, that is, the corrected relationship between the inlet water pressure and the outlet water flow rate.

[0018] A reverse osmosis membrane monitoring system for a desalted water station, using the reverse osmosis membrane monitoring method for a desalted water station, comprising: a high-pressure pump control module, a high-pressure pump, a data processing module, a communication module, a data acquisition module and a correction module;

[0019] The high-pressure pump is connected to the high-pressure pump control module; the high-pressure pump control module, communication module, data acquisition module and correction module are respectively connected to the data processing module.

[0020] Preferably, the correction module includes a data storage module and a correction calculation module; the data storage module and the correction calculation module are respectively connected to the data processing module.

[0021] The beneficial effects of the present invention are: real-time monitoring and precise evaluation: by acquiring the relationship between the water inlet pressure and the water outlet flow in real time and dynamically calculating the reverse osmosis attenuation of the reverse osmosis membrane, subtle changes in membrane performance can be discovered in time, providing a scientific basis for preventive maintenance and avoiding fluctuations in produced water quality and losses in production efficiency due to degradation of membrane performance.

[0022] Intelligent compensation and optimized control: Based on the relationship between the current speed of the high-pressure pump and the water inlet pressure, the performance attenuation of the high-pressure pump is evaluated, and the high-pressure pump is compensated through the correction module to ensure that the expected water flow rate is achieved under the same water inlet pressure. This dynamic adjustment mechanism effectively compensates for the efficiency loss caused by pump performance attenuation and optimizes system energy consumption.

[0023] Improvement of overall system performance: By comprehensively considering the reverse osmosis attenuation and the performance of the high-pressure pump after compensation, the relationship between the inlet pressure and the outlet flow rate is corrected to achieve precise control of the reverse osmosis module. This not only improves the desalination efficiency, but also reduces the membrane damage caused by improper operation and prolongs the service life of the reverse osmosis membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flow chart of the reverse osmosis membrane monitoring method of a desalination station;

[0025] Figure 2 This is the principle diagram of the reverse osmosis membrane monitoring system of the desalination station;

[0026] Figure 3 Schematic diagram of the correction module. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0028] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0029] like Figure 1 As shown, the reverse osmosis membrane monitoring method of a desalination station comprises the following steps:

[0030] Step 1: Test the reverse osmosis module to obtain the relationship between the current water inlet pressure and the water outlet flow rate. According to the relationship between the current water inlet pressure and the water outlet flow rate, obtain the reverse osmosis attenuation of the reverse osmosis membrane. If the reverse osmosis attenuation is greater than the set attenuation threshold, replace the reverse osmosis membrane. Otherwise, the reverse osmosis membrane performance is normal, and enter step 2.

[0031] Step 2: Obtain the relationship between the current rotation speed of the high-pressure pump and the water inlet pressure, and obtain the performance attenuation of the high-pressure pump according to the relationship between the initial rotation speed of the high-pressure pump and the water inlet pressure, and then proceed to step 3;

[0032] Step 3: Send the current relationship between the high-pressure pump speed and the water inlet pressure to the correction module. The correction module compensates the high-pressure pump according to the attenuation of the high-pressure pump performance to obtain the compensated high-pressure pump speed under the same water inlet pressure. Send the obtained compensated relationship between the high-pressure pump speed and the water inlet pressure to the high-pressure pump control module to control the high-pressure pump, and then enter step 4;

[0033] Step 4, obtaining a corrected relationship between inlet water pressure and outlet water flow rate according to the obtained reverse osmosis attenuation and the compensated relationship between the high-pressure pump speed and the inlet water pressure;

[0034] Step 5: Control the reverse osmosis module according to the corrected relationship between the water inlet pressure and the water outlet flow rate.

[0035] The reverse osmosis module is tested to obtain the relationship between the inlet pressure and the outlet flow rate, and the reverse osmosis attenuation of the reverse osmosis membrane is obtained according to the relationship between the inlet pressure and the outlet flow rate, including:

[0036] The water pressure on the inlet side of the reverse osmosis membrane and the outlet flow rate on the outlet side of the reverse osmosis membrane are obtained to obtain the relationship between the current inlet pressure and the outlet flow rate; based on the relationship between the standard inlet pressure and the outlet flow rate, the outlet flow rate difference under the same inlet pressure is obtained, and the outlet flow rate difference under the same inlet pressure is the reverse osmosis attenuation of the reverse osmosis membrane.

[0037] The method of obtaining the relationship between the current rotation speed of the high-pressure pump and the water inlet pressure, and obtaining the performance attenuation of the high-pressure pump according to the relationship between the initial rotation speed of the high-pressure pump and the water inlet pressure, includes:

[0038] According to the relationship between the current speed of the high-pressure pump and the water inlet pressure, the speed difference between the current speed of the high-pressure pump and the initial speed of the high-pressure pump under the same water inlet pressure is obtained. The ratio of the speed difference to the initial speed of the high-pressure pump is the performance attenuation of the high-pressure pump.

[0039] The method of sending the current relationship between the high-pressure pump speed and the water inlet pressure to the correction module, which compensates the high-pressure pump according to the attenuation of the high-pressure pump performance to obtain the compensated high-pressure pump speed under the same water inlet pressure, includes:

[0040] The sum of the speed difference and the initial speed is the compensated high-pressure pump speed under the water inlet pressure corresponding to the initial speed, that is, the compensated high-pressure pump speed under the same water inlet pressure.

[0041] The method of obtaining the corrected relationship between the inlet pressure and the outlet flow rate according to the obtained reverse osmosis attenuation and the compensated relationship between the high-pressure pump speed and the inlet pressure includes:

[0042] The corrected outlet flow rate is obtained based on the reverse osmosis attenuation of the obtained inlet water pressure and the sum of the outlet flow rate of the standard outlet water flow rate of the corresponding inlet water pressure. The corresponding corrected inlet water pressure is obtained based on the corrected outlet water flow rate, and the management of the corrected inlet water pressure and the standard outlet water flow rate is obtained, that is, the corrected relationship between the inlet water pressure and the outlet water flow rate.

[0043] like Figure 2 As shown, a reverse osmosis membrane monitoring system for a desalted water station, using the reverse osmosis membrane monitoring method for a desalted water station, comprises: a high-pressure pump control module, a high-pressure pump, a data processing module, a communication module, a data acquisition module and a correction module;

[0044] The high-pressure pump is connected to the high-pressure pump control module; the high-pressure pump control module, communication module, data acquisition module and correction module are respectively connected to the data processing module.

[0045] like Figure 3 As shown, the correction module includes a data storage module and a correction calculation module; the data storage module and the correction calculation module are respectively connected to the data processing module.

[0046] Specifically, the desalination station reverse osmosis membrane monitoring method comprises the following steps:

[0047] Step 1: Reverse osmosis membrane performance test and attenuation evaluation, obtain test data: First, test the reverse osmosis module to obtain data on the relationship between the current inlet pressure and outlet flow rate. This includes measuring the water pressure on the inlet side of the reverse osmosis membrane and the outlet flow rate on the outlet side of the reverse osmosis membrane.

[0048] Calculate the reverse osmosis attenuation: Compare the current relationship between the inlet pressure and the outlet flow rate with the standard relationship between the inlet pressure and the outlet flow rate to obtain the outlet flow difference under the same inlet pressure. This difference is the reverse osmosis attenuation of the reverse osmosis membrane. If the reverse osmosis attenuation is greater than the set attenuation threshold, it means that the performance of the reverse osmosis membrane has significantly decreased and a new reverse osmosis membrane needs to be replaced. If the reverse osmosis attenuation is within the threshold, it means that the reverse osmosis membrane performance is normal and you can proceed to the next step.

[0049] Step 2: High-pressure pump performance test and attenuation evaluation, obtain test data: obtain the relationship data between the current speed of the high-pressure pump and the water inlet pressure. This includes measuring the water inlet pressure of the high-pressure pump at different speeds.

[0050] Calculate the performance attenuation of the high-pressure pump: Based on the collected relationship between the current speed of the high-pressure pump and the water inlet pressure, compare it with the relationship between the initial speed of the high-pressure pump and the water inlet pressure, and obtain the speed difference between the current speed of the high-pressure pump and the initial speed of the high-pressure pump under the same water inlet pressure. The ratio of the speed difference to the initial speed of the high-pressure pump is the performance attenuation of the high-pressure pump.

[0051] Step 3: High-pressure pump speed compensation, sending data to the correction module: Send the relationship between the current high-pressure pump speed and the water inlet pressure to the correction module.

[0052] Compensation calculation: The correction module compensates the high-pressure pump according to the attenuation of the high-pressure pump performance. The compensation method is to add the speed difference to the initial speed to obtain the compensated high-pressure pump speed under the water inlet pressure corresponding to the initial speed. This speed is the compensated high-pressure pump speed under the same water inlet pressure.

[0053] Sending the compensated rotational speed to the control module: sending the obtained relationship between the compensated high-pressure pump rotational speed and the water inlet pressure to the high-pressure pump control module to control the high-pressure pump.

[0054] Step 4: Correct the relationship between the inlet pressure and the outlet flow rate, and calculate the corrected outlet flow rate: According to the obtained reverse osmosis attenuation, correct the relationship between the inlet pressure and the outlet flow rate. The specific method is to add the reverse osmosis attenuation of the inlet pressure to the standard outlet flow rate of the corresponding inlet pressure to obtain the corrected outlet flow rate.

[0055] Obtain the corrected relationship: Obtain the corresponding corrected water inlet pressure according to the corrected water outlet flow, thereby obtaining the relationship between the corrected water inlet pressure and the standard water outlet flow, that is, the corrected relationship between the water inlet pressure and the water outlet flow.

[0056] Step 5: Reverse osmosis module control: According to the corrected relationship between inlet water pressure and outlet water flow, the reverse osmosis module is controlled. By adjusting the inlet water pressure and the speed of the high-pressure pump, the reverse osmosis module is ensured to always operate in the optimal state, thereby improving the outlet water quality and system efficiency.

[0057] In order to realize the above intelligent control method, this paper designs an intelligent control device for desalination water station. The device includes a high-pressure pump control module, a high-pressure pump, a data processing module, a communication module, a data acquisition module and a correction module.

[0058] The high-pressure pump is one of the core equipment of the desalination station, responsible for providing the high-pressure water flow required for the reverse osmosis process. The high-pressure pump control module is connected to the high-pressure pump, responsible for receiving the control instructions of the data processing module and adjusting the speed and water inlet pressure of the high-pressure pump.

[0059] The data processing module is the core of the intelligent control device, which is responsible for receiving the real-time data sent by the data acquisition module, and processing and analyzing it. According to the analysis results, the data processing module generates control instructions and sends them to the high-pressure pump control module and the correction module.

[0060] The communication module is responsible for realizing the communication between the data processing module and the external device or system. Through the communication module, the operation status of the desalted water station can be remotely monitored and controlled.

[0061] The data acquisition module is responsible for real-time collection of the operating data of the desalted water station, including water inlet pressure, water outlet flow, high-pressure pump speed, etc. The collected data is sent to the data processing module for processing and analysis.

[0062] The correction module includes a data storage module and a correction calculation module. The data storage module is responsible for storing reference data such as the relationship between the standard water inlet pressure and the water outlet flow rate, the relationship between the initial speed of the high-pressure pump and the water inlet pressure. The correction calculation module is responsible for performing compensation calculations based on the real-time data and reference data sent by the data processing module, and generating compensated control instructions to send to the high-pressure pump control module.

[0063] Embodiment 1:

[0064] A desalted water station uses the desalted water station reverse osmosis membrane monitoring method proposed in this paper to optimize the system. First, by testing the reverse osmosis module, the data of the relationship between the current inlet pressure and the outlet flow rate are obtained. After calculation, it is found that the reverse osmosis attenuation of the reverse osmosis membrane exceeds the set attenuation threshold, so a new reverse osmosis membrane needs to be replaced. After replacement, the reverse osmosis membrane is tested again to confirm that the performance of the reverse osmosis membrane has returned to normal.

[0065] Next, the high-pressure pump was tested for performance and the relationship between the current speed and the water inlet pressure was obtained. By comparing the relationship between the initial speed of the high-pressure pump and the water inlet pressure, the performance attenuation of the high-pressure pump was calculated. Based on the attenuation, the correction module compensated the high-pressure pump and obtained the compensated high-pressure pump speed under the same water inlet pressure.

[0066] Finally, the reverse osmosis module was controlled based on the corrected relationship between the inlet pressure and the outlet flow rate. By adjusting the inlet pressure and the high-pressure pump speed, the reverse osmosis module was ensured to always operate in the optimal state. After implementation, the outlet water quality of the desalted water station was significantly improved, and the system efficiency was also increased by about 10%.

[0067] Embodiment 2:

[0068] Another desalination station also adopted the desalination station reverse osmosis membrane monitoring method proposed in this paper to optimize the system. During the implementation process, the reverse osmosis module of the station was first fully tested to obtain detailed data on the relationship between the inlet pressure and the outlet flow rate. After calculation and analysis, it was found that the performance degradation of the reverse osmosis membrane was within an acceptable range, so there was no need to replace the new membrane.

[0069] Subsequently, the station's high-pressure pump was tested for performance, and the relationship between the current speed and the water inlet pressure was obtained. By comparing the initial performance data of the high-pressure pump, the performance attenuation was calculated, and corresponding compensation calculations were performed. Based on the compensation results, the speed control strategy of the high-pressure pump was adjusted.

[0070] Finally, according to the corrected data on the relationship between inlet pressure and outlet flow, the reverse osmosis module was finely controlled and adjusted. By implementing intelligent control methods, the outlet water quality of the desalted water station has been steadily improved, the system efficiency has also been increased by about 8%, and the operating cost and maintenance difficulty have been reduced.

Claims

1. A method for monitoring reverse osmosis membranes in a desalination station, characterized in that: The steps include: Step 1: Test the reverse osmosis module to obtain the relationship between the current water inlet pressure and the water outlet flow rate. According to the relationship between the current water inlet pressure and the water outlet flow rate, obtain the reverse osmosis attenuation of the reverse osmosis membrane. If the reverse osmosis attenuation is greater than the set attenuation threshold, replace the reverse osmosis membrane. Otherwise, the reverse osmosis membrane performance is normal, and enter step 2. Step 2: Obtain the relationship between the current rotation speed of the high-pressure pump and the water inlet pressure, and obtain the performance attenuation of the high-pressure pump according to the relationship between the initial rotation speed of the high-pressure pump and the water inlet pressure, and then proceed to step 3; Step 3: Send the current relationship between the high-pressure pump speed and the water inlet pressure to the correction module. The correction module compensates the high-pressure pump according to the attenuation of the high-pressure pump performance to obtain the compensated high-pressure pump speed under the same water inlet pressure. Send the obtained compensated relationship between the high-pressure pump speed and the water inlet pressure to the high-pressure pump control module to control the high-pressure pump, and then enter step 4; Step 4, obtaining a corrected relationship between inlet water pressure and outlet water flow rate according to the obtained reverse osmosis attenuation and the compensated relationship between the high-pressure pump speed and the inlet water pressure; Step 5, controlling the reverse osmosis module according to the corrected relationship between the water inlet pressure and the water outlet flow rate; The method of obtaining the relationship between the current rotation speed of the high-pressure pump and the water inlet pressure, and obtaining the performance attenuation of the high-pressure pump according to the relationship between the initial rotation speed of the high-pressure pump and the water inlet pressure, includes: According to the relationship between the current speed of the high-pressure pump and the water inlet pressure, the speed difference between the current speed of the high-pressure pump and the initial speed of the high-pressure pump under the same water inlet pressure is obtained, and the ratio of the speed difference to the initial speed of the high-pressure pump is the performance attenuation of the high-pressure pump; The relationship between the current high-pressure pump speed and the water inlet pressure is sent to the correction module, and the correction module compensates the high-pressure pump according to the attenuation of the high-pressure pump performance to obtain the compensated high-pressure pump speed under the same water inlet pressure, including: The sum of the speed difference and the initial speed is the compensated high-pressure pump speed under the water inlet pressure corresponding to the initial speed, that is, the compensated high-pressure pump speed under the same water inlet pressure; The method of obtaining the corrected relationship between the inlet pressure and the outlet flow rate according to the obtained reverse osmosis attenuation and the compensated relationship between the high-pressure pump speed and the inlet pressure includes: The corrected outlet flow rate is obtained based on the reverse osmosis attenuation of the obtained inlet water pressure and the sum of the outlet flow rate of the standard outlet water flow rate of the corresponding inlet water pressure. The corresponding corrected inlet water pressure is obtained based on the corrected outlet water flow rate, and the management of the corrected inlet water pressure and the standard outlet water flow rate is obtained, that is, the corrected relationship between the inlet water pressure and the outlet water flow rate.

2. The method for monitoring reverse osmosis membrane of a desalted water station according to claim 1, characterized in that: The reverse osmosis module is tested to obtain the relationship between the inlet pressure and the outlet flow rate, and the reverse osmosis attenuation of the reverse osmosis membrane is obtained according to the relationship between the inlet pressure and the outlet flow rate, including: The water pressure on the inlet side of the reverse osmosis membrane and the outlet flow rate on the outlet side of the reverse osmosis membrane are obtained to obtain the relationship between the current inlet pressure and the outlet flow rate; based on the relationship between the standard inlet pressure and the outlet flow rate, the outlet flow rate difference under the same inlet pressure is obtained, and the outlet flow rate difference under the same inlet pressure is the reverse osmosis attenuation of the reverse osmosis membrane.

3. Desalination station reverse osmosis membrane monitoring system, characterized in that: The method for monitoring reverse osmosis membrane of a desalted water station according to any one of claims 1 to 2 comprises: a high-pressure pump control module, a high-pressure pump, a data processing module, a communication module, a data acquisition module and a correction module; The high-pressure pump is connected to the high-pressure pump control module; the high-pressure pump control module, communication module, data acquisition module and correction module are respectively connected to the data processing module.

4. The reverse osmosis membrane monitoring system for desalted water station according to claim 3, characterized in that: The correction module comprises a data storage module and a correction calculation module; the data storage module and the correction calculation module are respectively connected to the data processing module.

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