Low-energy-consumption reverse osmosis membrane seawater desalination and water quality regulation and control intelligent system

Abstract

The invention discloses a low-energy-consumption reverse osmosis membrane seawater desalination and water quality regulation and control intelligent system, which comprises: a reverse osmosis treatment module for performing reverse osmosis treatment on seawater to generate fresh water and strong brine; the pressure supply module is used for providing and maintaining the operation pressure required by the reverse osmosis treatment module; the energy recovery module is used for transmitting the pressure energy of the strong brine to the pressure supply module; the monitoring module is used for collecting inlet water quality parameters and operation state parameters, and calculating a membrane pollution index and a pollution rate based on the collected parameters; the intelligent control module is used for adjusting the output pressure and the operation state according to the membrane pollution index and the pollution rate; when the membrane pollution index exceeds a preset threshold value, the output pressure is controlled to be reduced, the opening degree of the adjustable guide vane is synchronously adjusted, the flow proportion of the high-pressure strong brine is increased, and the energy transfer efficiency is improved. The problems that a traditional system is high in energy consumption, membrane pollution response lags behind and cleaning and maintenance are frequent are solved, and water production energy consumption is reduced, the service life of a membrane element is prolonged, and the system runs continuously and stably.

Description

Technical Field

[0001] This invention relates to the field of reverse osmosis membrane seawater desalination technology, and in particular to a low-energy intelligent system for reverse osmosis membrane seawater desalination and water quality control. Background Technology

[0002] With the increasing severity of global freshwater scarcity, reverse osmosis seawater desalination technology has become an important option for ensuring water supply security in coastal areas. However, existing systems still face two major bottlenecks in large-scale applications. Traditional reverse osmosis processes rely on high-pressure pumps to maintain operating pressure, and electricity consumption accounts for a significant proportion of water production costs. This high energy consumption severely weakens the technology's economic competitiveness and sustainable development capabilities. More critically, the complex organic matter, inorganic salts, and microbial components in seawater easily form a fouling layer on the membrane surface, leading not only to a continuous decline in membrane flux and separation efficiency but also to fluctuations in product water quality. Existing technologies lack effective monitoring and dynamic response mechanisms for membrane fouling processes, making it difficult to intelligently adjust operating parameters based on real-time water quality changes. This results in frequent cleaning and maintenance, shortened membrane element lifespan, and affects the long-term stable operation of the system.

[0003] Therefore, there is an urgent need to provide a technical solution to address the above problems. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a low-energy-consumption reverse osmosis membrane seawater desalination and water quality control intelligent system. The technical solution of this system is as follows: The reverse osmosis treatment module processes seawater through reverse osmosis to produce fresh water and concentrated brine. The pressure supply module is connected to the inlet of the reverse osmosis treatment module and provides and maintains the operating pressure required by the reverse osmosis treatment module. An energy recovery module is connected to the pressure supply module and the concentrate discharge end of the reverse osmosis treatment module, and transfers the pressure energy of the concentrated brine to the pressure supply module. The monitoring module collects the feed water quality parameters and operating status parameters of the reverse osmosis treatment module in real time, and calculates the membrane fouling index and fouling rate based on the collected parameters. The intelligent control module connects the monitoring module, the pressure supply module, and the energy recovery module. It adjusts the output pressure of the pressure supply module and the operating status of the energy recovery module based on the membrane fouling index and the fouling rate. When the membrane fouling index exceeds a preset threshold, it controls the pressure supply module to reduce its output pressure and simultaneously adjusts the opening of the adjustable guide vanes of the energy recovery module to increase the proportion of high-pressure concentrated brine flow through the energy recovery module, thereby improving energy transfer efficiency.

[0005] Furthermore, the reverse osmosis processing module is specifically used for: The seawater is subjected to reverse osmosis treatment. Under the operating pressure provided by the pressure supply module, the seawater passes through the reverse osmosis membrane. Water molecules selectively permeate through the reverse osmosis membrane to produce fresh water, while the seawater components that do not permeate are concentrated into the brine.

[0006] Furthermore, the pressure supply module is specifically used for: The system receives a pressure adjustment command from the intelligent control module, adjusts the operating frequency of the drive motor according to the pressure adjustment command, and sends the adjusted operating pressure to the reverse osmosis treatment module through the water inlet to maintain the operating pressure of the reverse osmosis treatment module within a preset range.

[0007] Furthermore, the energy recovery module is specifically used for: The system receives concentrated brine discharged from the concentrated brine outlet of the reverse osmosis treatment module, extracts pressure energy from the concentrated brine, and transmits the extracted pressure energy to the pressure supply module.

[0008] Furthermore, the monitoring module is specifically used for: Water quality parameters are collected by sensors installed at the inlet of the reverse osmosis treatment module, and operating status parameters are collected by pressure and flow sensors installed in the reverse osmosis treatment module. The membrane fouling index is calculated based on the influent water quality parameters and the operating status parameters, and the fouling rate is calculated based on the change of the membrane fouling index over time.

[0009] Furthermore, the monitoring module is specifically used for: The membrane fouling index is calculated based on the fouling density index and turbidity in the influent water quality parameters and the transmembrane pressure, membrane flux and operating time in the operating status parameters. The formula for calculating the membrane fouling index is: MFI = (SDI × T × TMP × e^(k·t)) / (J × R_m), where MFI represents the membrane fouling index, SDI represents the fouling density index obtained from the influent water quality parameters, T represents the turbidity obtained from the influent water quality parameters, TMP represents the transmembrane pressure obtained from the operating status parameters, J represents the membrane flux obtained from the operating status parameters, t represents the operating time obtained from the operating status parameters, k represents the membrane fouling accumulation coefficient, and R_m represents the membrane resistance coefficient.

[0010] Furthermore, the monitoring module is specifically used for: The fouling rate is calculated based on the change in the membrane fouling index over a time interval; The formula for calculating the fouling rate is: PR = (MFI_t - MFI_0) / (1 + α·Δt), where PR represents the fouling rate, MFI_t represents the membrane fouling index at the current moment, MFI_0 represents the membrane fouling index at the initial moment, Δt represents the time interval, and α represents the fouling acceleration factor.

[0011] Furthermore, the intelligent control module is specifically used for: Based on the membrane fouling index and the fouling rate, a pressure regulation command and an energy recovery regulation command are generated. The pressure regulation command is sent to the pressure supply module to adjust the output pressure, and the energy recovery regulation command is sent to the energy recovery module to adjust the operating state.

[0012] Furthermore, the intelligent control module is specifically used for: When the membrane fouling index exceeds a preset first threshold, the pressure supply module is controlled to reduce the output pressure by a first ratio, and the opening of the adjustable guide vanes of the energy recovery module is adjusted to a first angle. When the membrane fouling index exceeds a higher second threshold, the pressure supply module is controlled to reduce the output pressure by a second ratio greater than the first ratio, and at the same time the opening of the adjustable guide vanes of the energy recovery module is adjusted to a second angle greater than the first angle, thereby increasing the proportion of high-pressure concentrated brine flow through the energy recovery module.

[0013] Furthermore, the intelligent control module is also used for: The first threshold and the second threshold are dynamically adjusted according to the pollution rate, and the first threshold and the second threshold are reduced accordingly when the pollution rate increases.

[0014] The technical solution of this invention works in concert with an energy recovery module and an intelligent control module to monitor and calculate the membrane fouling index in real time and dynamically adjust the operating pressure and the opening of the guide vanes of the energy recovery module, thereby optimizing the high-pressure concentrated brine flow ratio. This solves the problems of high energy consumption, delayed membrane fouling response, and frequent cleaning and maintenance in traditional systems, and achieves reduced water production energy consumption, extended membrane element life, and improved continuous and stable system operation capability.

[0015] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of an embodiment of the intelligent system for low-energy reverse osmosis membrane seawater desalination and water quality control according to the present invention. Detailed Implementation

[0018] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0019] Figure 1 This diagram illustrates a structural schematic of an embodiment of a low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system provided by the present invention. Figure 1 As shown, this low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system includes: The reverse osmosis treatment module 110 processes seawater through reverse osmosis to produce fresh water and concentrated brine.

[0020] Seawater refers to water bodies naturally existing in the ocean, containing various dissolved salts and impurities; for example, the raw water drawn from the East China Sea by a desalination plant has a salinity of approximately 3.5%. Reverse osmosis treatment refers to the separation process where seawater is forced through a semi-permeable membrane under applied pressure, allowing water molecules to selectively permeate while solutes are retained; for example, seawater passing through a polyamide composite membrane at 6 MPa pressure yields product water with a total dissolved solids (TDS) of less than 500 mg / L. Freshwater refers to water with a significantly reduced TDS content obtained through reverse osmosis treatment; for example, the water produced by a reverse osmosis system meets drinking water standards, with a TDS of 300 mg / L. Concentrated brine refers to concentrated seawater that does not permeate the membrane during the reverse osmosis process; for example, the brine discharged from the reverse osmosis membrane module has a concentration 1.5 times that of the original seawater, with a salt content of approximately 5.25%.

[0021] The pressure supply module 120 is connected to the inlet of the reverse osmosis treatment module 110 and provides and maintains the operating pressure required by the reverse osmosis treatment module 110.

[0022] The inlet refers to the point where the reverse osmosis treatment module receives seawater; for example, the connecting pipe between the high-pressure pump outlet and the reverse osmosis membrane housing inlet. Operating pressure refers to the inlet water pressure required to maintain normal reverse osmosis treatment; for example, a seawater desalination system operates stably within a pressure range of 5.8-6.2 MPa.

[0023] The energy recovery module 130 is connected to the pressure supply module 120 and the concentrated water discharge end of the reverse osmosis treatment module 110, and transfers the pressure energy of the concentrated brine to the pressure supply module 120.

[0024] The concentrate discharge end refers to the outlet location where the concentrated seawater is discharged from the reverse osmosis treatment module; for example, the concentrate collection pipe installed at the end of the reverse osmosis membrane module. Pressure energy refers to the mechanical energy possessed by concentrated brine under high pressure; for example, approximately 95% of the pressure energy can be recovered when concentrated brine at a pressure of 5.9 MPa passes through an energy recovery device.

[0025] The monitoring module 140 collects the influent water quality parameters and operating status parameters of the reverse osmosis treatment module 110 in real time, and calculates the membrane fouling index and fouling rate based on the collected parameters.

[0026] Among them, the feed water quality parameters refer to the index data reflecting the quality characteristics of the seawater feedstock; for example, the pollution density index detected in real time by the monitoring module is 3.2, and the turbidity is 0.8 NTU. The operating status parameters refer to the real-time data reflecting the operating conditions of the reverse osmosis system; for example, the current transmembrane pressure of the system is 0.8 MPa, and the membrane flux is 22 L / m³. 2 • h. Membrane fouling index refers to a comprehensive indicator that quantitatively characterizes the degree of fouling on the membrane surface; for example, the membrane fouling index calculated based on real-time data is 185. Fouling rate refers to the change in membrane fouling index per unit time; for example, the fouling rate calculated for the system during an 8-hour operation period is 12.5 / h.

[0027] The intelligent control module 150 is connected to the monitoring module 140, the pressure supply module 120, and the energy recovery module 130. It adjusts the output pressure of the pressure supply module 120 and the operating status of the energy recovery module 130 based on the membrane fouling index and the fouling rate. When the membrane fouling index exceeds a preset threshold, it controls the pressure supply module 120 to reduce its output pressure and simultaneously adjusts the opening of the adjustable guide vanes of the energy recovery module 130 to increase the proportion of high-pressure concentrated brine flow through the energy recovery module 130, thereby improving energy transfer efficiency.

[0028] Here, output pressure refers to the actual working pressure provided by the pressure supply module; for example, the intelligent control module adjusts the high-pressure pump output pressure from 6.2 MPa to 5.9 MPa. Operating status refers to the current operating mode of the energy recovery module; for example, the energy recovery device is in high-efficiency recovery mode with the guide vane opening at 65 degrees. Preset threshold refers to the pre-set membrane fouling index critical value; for example, the system sets the first threshold to 200 and the second threshold to 280. Adjustable guide vane opening refers to the angle position of the adjustable vanes in the energy recovery device; for example, the guide vanes are adjusted from 50 degrees to 70 degrees to increase the flow area. High-pressure concentrated brine flow rate ratio refers to the ratio of high-pressure concentrated brine passing through the energy recovery device to the total concentrated brine volume; for example, the system increases the high-pressure concentrated brine flow rate ratio from 70% to 85%.

[0029] The technical solution of this embodiment works in concert with the energy recovery module and the intelligent control module to monitor and calculate the membrane fouling index in real time and dynamically adjust the operating pressure and the opening of the guide vanes of the energy recovery module, thereby optimizing the high-pressure concentrated brine flow ratio. This solves the problems of high energy consumption, delayed membrane fouling response, and frequent cleaning and maintenance in traditional systems, and achieves reduced water production energy consumption, extended membrane element life, and improved continuous and stable system operation capability.

[0030] In one alternative embodiment, the reverse osmosis processing module 110 is specifically used for: The seawater is subjected to reverse osmosis treatment. Under the operating pressure provided by the pressure supply module 120, the seawater passes through the reverse osmosis membrane. Water molecules selectively permeate through the reverse osmosis membrane to produce fresh water, while the seawater components that do not permeate are concentrated into the brine.

[0031] Here, water molecules refer to the basic particles that make up water, H2O; for example, in the reverse osmosis process, water molecules pass through a separation membrane with a pore size of 0.1 nm.

[0032] Among the above-mentioned optional methods, it is further clarified that the reverse osmosis treatment module achieves seawater membrane separation through pressure drive, water molecules selectively permeate to form fresh water, and the non-permeable components are concentrated into brine, providing a high-pressure brine source for the energy recovery module to support the subsequent energy transfer process.

[0033] In an alternative embodiment, the pressure supply module 120 is specifically used for: The system receives a pressure adjustment command from the intelligent control module 150, adjusts the operating frequency of the drive motor according to the pressure adjustment command, and sends the adjusted operating pressure to the reverse osmosis treatment module 110 through the water inlet to maintain the operating pressure of the reverse osmosis treatment module 110 within a preset range.

[0034] Here, "pressure regulation command" refers to the pressure adjustment signal issued by the intelligent control module; for example, the control system sends a command to the frequency converter to reduce the frequency from 48Hz to 45Hz. "Drive motor" refers to the electric motor that provides power in the pressure supply module; for example, a 280kW permanent magnet synchronous motor drives a high-pressure pump via a coupling. "Operating frequency" refers to the operating frequency of the power supply to the drive motor; for example, the motor's operating frequency is adjustable within the range of 35-50Hz. "Adjusted operating pressure" refers to the actual operating pressure after adjustment by the intelligent control module; for example, the pressure supply module outputs a stable pressure of 5.9MPa. "Preset range" refers to the pressure range allowed for normal system operation; for example, the reverse osmosis treatment module requires the operating pressure to be maintained between 5.8-6.3MPa.

[0035] In the above-mentioned optional method, it is further specified that the pressure supply module receives intelligent control instructions, adjusts the output pressure by adjusting the operating frequency of the drive motor, and stably delivers the pressure to the inlet of the reverse osmosis treatment module to maintain the operating pressure within the preset range.

[0036] In one alternative embodiment, the energy recovery module 130 is specifically used for: The system receives concentrated brine discharged from the concentrated brine outlet of the reverse osmosis treatment module 110, extracts pressure energy from the concentrated brine, and transmits the extracted pressure energy to the pressure supply module 120.

[0037] In the above-mentioned optional methods, it is further explained that the energy recovery module receives concentrated brine discharge, extracts pressure energy from it and transfers it to the pressure supply module, thereby realizing the reuse of waste energy, reducing the energy consumption of the drive motor and improving the overall energy utilization efficiency.

[0038] In an alternative embodiment, the monitoring module 140 is specifically used for: Water quality parameters are collected by sensors installed at the inlet of the reverse osmosis treatment module 110, and operating status parameters are collected by pressure sensors and flow sensors installed in the reverse osmosis treatment module 110. The membrane fouling index is calculated based on the influent water quality parameters and the operating status parameters, and the fouling rate is calculated based on the change of the membrane fouling index over time.

[0039] In the above-mentioned optional methods, the monitoring module is further defined to collect water quality parameters through inlet end sensors, collect operating parameters through pressure and flow sensors, calculate membrane fouling index based on inlet water quality and operating status parameters, and calculate fouling rate based on index change.

[0040] In an alternative embodiment, the monitoring module 140 is specifically used for: The membrane fouling index is calculated based on the fouling density index and turbidity in the influent water quality parameters and the transmembrane pressure, membrane flux and operating time in the operating status parameters. The formula for calculating the membrane fouling index is: MFI = (SDI × T × TMP × e^(k·t)) / (J × R_m), where MFI represents the membrane fouling index, SDI represents the fouling density index obtained from the influent water quality parameters, T represents the turbidity obtained from the influent water quality parameters, TMP represents the transmembrane pressure obtained from the operating status parameters, J represents the membrane flux obtained from the operating status parameters, t represents the operating time obtained from the operating status parameters, k represents the membrane fouling accumulation coefficient, and R_m represents the membrane resistance coefficient.

[0041] It should be noted that the membrane fouling index calculation formula comprehensively considers the fouling density index and turbidity in the influent water quality parameters, as well as the transmembrane pressure, membrane flux, and operating time in the operational parameters. It also introduces the membrane fouling accumulation coefficient and membrane resistance coefficient, describing the nonlinear accumulation process of fouling over time through an exponential function. This establishes a comprehensive index that fully reflects the degree of fouling on the membrane surface. By quantifying the membrane fouling status in real time, this formula provides the intelligent control module with accurate fouling assessment data, supporting dynamic adjustment of operating parameters to mitigate the impact of fouling and improve system efficiency.

[0042] In the above-mentioned optional methods, the fouling density index, turbidity, transmembrane pressure, membrane flux, operating time, membrane fouling accumulation coefficient and membrane resistance coefficient are further used to calculate the membrane fouling index through an index formula, and the degree of membrane fouling is accurately quantified by multi-parameter coupling.

[0043] In an alternative embodiment, the monitoring module 140 is specifically used for: The fouling rate is calculated based on the change in the membrane fouling index over a time interval; The formula for calculating the fouling rate is: PR = (MFI_t - MFI_0) / (1 + α·Δt), where PR represents the fouling rate, MFI_t represents the membrane fouling index at the current moment, MFI_0 represents the membrane fouling index at the initial moment, Δt represents the time interval, and α represents the fouling acceleration factor.

[0044] It should be noted that the fouling rate calculation formula is based on the change in the membrane fouling index over a time interval, and a fouling acceleration factor is introduced to correct for the time interval, calculating the average rate of change of the membrane fouling index per unit time, thus accurately characterizing the speed of fouling development. This formula provides dynamic information on fouling changes, enabling the intelligent control module to respond promptly to fouling trends and adjust control strategies, enhancing the system's predictability and adaptability to the fouling process.

[0045] In the above-mentioned optional methods, the fouling rate is further calculated based on the change of the membrane fouling index over the time interval, a fouling acceleration factor is introduced, the fouling development trend is quantified, and a scientific basis is provided for the intelligent control module to dynamically adjust the threshold.

[0046] In one alternative embodiment, the intelligent control module 150 is specifically used for: Based on the membrane fouling index and the fouling rate, a pressure regulation command and an energy recovery regulation command are generated. The pressure regulation command is sent to the pressure supply module 120 to adjust the output pressure, and the energy recovery regulation command is sent to the energy recovery module 130 to adjust the operating state.

[0047] In the above-mentioned optional methods, it is further specified that the intelligent control module generates pressure regulation commands and energy recovery regulation commands based on the membrane fouling index and fouling rate, and sends them to the pressure supply module and energy recovery module respectively to achieve linkage control.

[0048] In one alternative embodiment, the intelligent control module 150 is specifically used for: When the membrane fouling index exceeds a preset first threshold, the pressure supply module 120 is controlled to reduce the output pressure by a first ratio, and the opening of the adjustable guide vanes of the energy recovery module 130 is adjusted to a first angle.

[0049] The first threshold refers to the membrane fouling index limit that triggers primary control; for example, when the membrane fouling index reaches 200, the first-stage pressure reduction procedure is initiated. The first proportion refers to the ratio of pressure reduction during primary control; for example, the output pressure is reduced from 6.0 MPa to 5.7 MPa by 5%. The first angle refers to the basic opening degree of the guide vanes during primary control; for example, the guide vanes of the energy recovery device are adjusted to a 55-degree position.

[0050] When the membrane fouling index exceeds a higher second threshold, the pressure supply module 120 is controlled to reduce the output pressure by a second ratio greater than the first ratio, and at the same time the opening of the adjustable guide vanes of the energy recovery module 130 is adjusted to a second angle greater than the first angle, thereby increasing the proportion of high-pressure concentrated brine flow through the energy recovery module 130.

[0051] The second threshold refers to a higher membrane fouling index limit that triggers advanced control; for example, initiating a secondary depressurization procedure when the membrane fouling index reaches 280. The second proportion refers to a larger percentage reduction in pressure during advanced control; for example, reducing the output pressure from 6.0 MPa to 5.52 MPa by 8%. The second angle refers to a larger opening of the guide vanes during advanced control; for example, adjusting the guide vanes of the energy recovery device to a 75-degree position.

[0052] In the above-mentioned optional methods, a graded control strategy is further set. When the membrane fouling index exceeds the first threshold, the pressure is reduced by a first proportion and the guide vanes are adjusted to a first angle. When it exceeds a higher second threshold, a larger adjustment is made to increase the proportion of high-pressure concentrated brine flow.

[0053] In an alternative embodiment, the intelligent control module 150 is further configured to: The first threshold and the second threshold are dynamically adjusted according to the pollution rate, and the first threshold and the second threshold are reduced accordingly when the pollution rate increases.

[0054] In the above-mentioned optional methods, it is further specified that the intelligent control module dynamically adjusts the first threshold and the second threshold according to the pollution rate, and reduces the threshold accordingly when the pollution rate increases, so that the control strategy adapts to the pollution development speed and improves the response sensitivity.

[0055] To better illustrate the technical solution of this embodiment, the following example is used for complete explanation: S10, the pressure supply module provides an operating pressure of 6.0MPa to the inlet of the reverse osmosis treatment module. Under the pressure drive, seawater passes through the reverse osmosis membrane. Water molecules selectively permeate through the membrane surface to form fresh water with a total dissolved solids of 350mg / L. The seawater components that do not permeate are concentrated into brine with a salt content of 5.3%. S20: The energy recovery module receives concentrated brine with a pressure of 5.8 MPa discharged from the concentrated water discharge end of the reverse osmosis treatment module, extracts pressure energy through the adjustable guide vane device, and transfers the recovered energy to the pressure supply module. S30: The monitoring module collects influent water quality parameters in real time, including a fouling density index of 3.5 and turbidity of 1.0 NTU. Operating status parameters include transmembrane pressure of 0.9 MPa and membrane flux of 20 L / m²·h. Based on the parameters, the membrane fouling index of 215 is calculated, and the fouling rate of 15.2 / h is calculated based on the index change. S40, the intelligent control module generates control commands based on the membrane fouling index of 215 and the fouling rate of 15.2 / h. When the membrane fouling index exceeds the first threshold of 200, the control pressure supply module will reduce the output pressure to 5.7MPa by 5%, and at the same time adjust the opening of the guide vanes of the energy recovery module to 55 degrees. In this embodiment, the low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system completes seawater desalination through the coordinated operation of various modules, and dynamically adjusts operating parameters and energy recovery status based on real-time monitoring data.

[0056] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this invention is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-disclosed concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this invention.

[0057] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and represent a limitation on a specific order or sequence. Where appropriate, the order of use for similar objects can be interchanged so that the embodiments of this application described herein can be implemented in an order other than that shown or described.

[0058] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A low-energy-consumption reverse osmosis membrane seawater desalination and water quality control intelligent system, characterized in that, The system includes: The reverse osmosis treatment module processes seawater through reverse osmosis to produce fresh water and concentrated brine. The pressure supply module is connected to the inlet of the reverse osmosis treatment module and provides and maintains the operating pressure required by the reverse osmosis treatment module. An energy recovery module is connected to the pressure supply module and the concentrate discharge end of the reverse osmosis treatment module, and transfers the pressure energy of the concentrated brine to the pressure supply module. The monitoring module collects the feed water quality parameters and operating status parameters of the reverse osmosis treatment module in real time, and calculates the membrane fouling index and fouling rate based on the collected parameters. The intelligent control module connects the monitoring module, the pressure supply module, and the energy recovery module. It adjusts the output pressure of the pressure supply module and the operating status of the energy recovery module based on the membrane fouling index and the fouling rate. When the membrane fouling index exceeds a preset threshold, it controls the pressure supply module to reduce its output pressure and simultaneously adjusts the opening of the adjustable guide vanes of the energy recovery module to increase the proportion of high-pressure concentrated brine flow through the energy recovery module, thereby improving energy transfer efficiency.

2. The low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system according to claim 1, characterized in that, The reverse osmosis processing module is specifically used for: The seawater is subjected to reverse osmosis treatment. Under the operating pressure provided by the pressure supply module, the seawater passes through the reverse osmosis membrane. Water molecules selectively permeate through the reverse osmosis membrane to produce fresh water, while the seawater components that do not permeate are concentrated into the brine.

3. The low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system according to claim 2, characterized in that, The pressure supply module is specifically used for: The system receives a pressure adjustment command from the intelligent control module, adjusts the operating frequency of the drive motor according to the pressure adjustment command, and sends the adjusted operating pressure to the reverse osmosis treatment module through the water inlet to maintain the operating pressure of the reverse osmosis treatment module within a preset range.

4. The low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system according to claim 3, characterized in that, The energy recovery module is specifically used for: The system receives concentrated brine discharged from the concentrated brine outlet of the reverse osmosis treatment module, extracts pressure energy from the concentrated brine, and transmits the extracted pressure energy to the pressure supply module.

5. The low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system according to claim 4, characterized in that, The monitoring module is specifically used for: Water quality parameters are collected by sensors installed at the inlet of the reverse osmosis treatment module, and operating status parameters are collected by pressure and flow sensors installed in the reverse osmosis treatment module. The membrane fouling index is calculated based on the influent water quality parameters and the operating status parameters, and the fouling rate is calculated based on the change of the membrane fouling index over time.

6. The low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system according to claim 5, characterized in that, The monitoring module is specifically used for: The membrane fouling index is calculated based on the fouling density index and turbidity in the influent water quality parameters and the transmembrane pressure, membrane flux and operating time in the operating status parameters. The formula for calculating the membrane fouling index is: MFI = (SDI × T × TMP × e^(k·t)) / (J × R_m), where MFI represents the membrane fouling index, SDI represents the fouling density index obtained from the influent water quality parameters, T represents the turbidity obtained from the influent water quality parameters, TMP represents the transmembrane pressure obtained from the operating status parameters, J represents the membrane flux obtained from the operating status parameters, t represents the operating time obtained from the operating status parameters, k represents the membrane fouling accumulation coefficient, and R_m represents the membrane resistance coefficient.

7. The low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system according to claim 6, characterized in that, The monitoring module is specifically used for: The fouling rate is calculated based on the change in the membrane fouling index over a time interval; The formula for calculating the fouling rate is: PR = (MFI_t - MFI_0) / (1 + α·Δt), where PR represents the fouling rate, MFI_t represents the membrane fouling index at the current moment, MFI_0 represents the membrane fouling index at the initial moment, Δt represents the time interval, and α represents the fouling acceleration factor.

8. The low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system according to claim 7, characterized in that, The intelligent control module is specifically used for: Based on the membrane fouling index and the fouling rate, a pressure regulation command and an energy recovery regulation command are generated. The pressure regulation command is sent to the pressure supply module to adjust the output pressure, and the energy recovery regulation command is sent to the energy recovery module to adjust the operating state.

9. The low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system according to claim 8, characterized in that, The intelligent control module is specifically used for: When the membrane fouling index exceeds a preset first threshold, the pressure supply module is controlled to reduce the output pressure by a first ratio, and the opening of the adjustable guide vanes of the energy recovery module is adjusted to a first angle. When the membrane fouling index exceeds a higher second threshold, the pressure supply module is controlled to reduce the output pressure by a second ratio greater than the first ratio, and at the same time the opening of the adjustable guide vanes of the energy recovery module is adjusted to a second angle greater than the first angle, thereby increasing the proportion of high-pressure concentrated brine flow through the energy recovery module.

10. The low-energy reverse osmosis membrane seawater desalination and water quality control intelligent system according to claim 9, characterized in that, The intelligent control module is also used for: The first threshold and the second threshold are dynamically adjusted according to the pollution rate, and the first threshold and the second threshold are reduced accordingly when the pollution rate increases.

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