A double membrane combined ultrapure water machine system

Abstract

The application discloses a kind of double membrane combination's ultrapure water machine system, comprising: double membrane combination system;Dynamic pressure regulating system;Integrated module;Intelligent control and monitoring system;High-efficiency cleaning and regeneration system.The application is by reasonably combining two kinds of membranes, exert respective advantages, simultaneously according to system control, so that system can dynamically adjust the use burden of RO membrane, can further be combined with self-cleaning number and water quality conductivity, to improve overall water quality and reduce the energy consumption of equipment.The application not only combines the advantages of nanofiltration membrane and reverse osmosis membrane, optimizes water treatment process, improves energy efficiency and enhances the intelligent level of system, but also realizes significant advantages in environmental protection, energy saving, maintainability and flexibility, and the modular design is more convenient for nanofiltration membrane module and RO membrane module in pipeline increase and replacement and the like operation.

Description

Technical Field

[0001] This invention relates to the field of ultrapure water system technology, and in particular to an ultrapure water system with a dual-membrane combination. Background Technology

[0002] Currently available ultrapure water systems on the market are typically based on reverse osmosis (RO) technology for water treatment, but most of these systems suffer from the following problems:

[0003] (1) Low energy efficiency: The high energy consumption of RO membranes results in high overall operating costs for the equipment.

[0004] (2) Membrane fouling problem: RO membranes are easily fouled and require frequent cleaning or replacement.

[0005] (3) Single membrane technology: Most equipment relies on a single RO membrane technology and cannot be flexibly adjusted according to changes in water quality.

[0006] Meanwhile, RO technology utilizes the properties of semi-permeable membranes, applying high pressure to force water molecules through the membrane surface, filtering out most dissolved solids, bacteria, viruses, and organic matter with a very high removal rate. However, due to its filtration principle, RO membranes are often ineffective at removing certain tiny ions in water (such as silicates, ammonia, and fluoride) or require high energy consumption. Therefore, increasing research and practice are attempting to combine other membrane technologies (such as nanofiltration membranes) with RO technology to achieve more efficient and energy-saving ultrapure water production. Nanofiltration membranes (NF) have larger pore sizes and higher flux, capable of removing some medium-sized organic molecules and divalent metal ions with lower energy consumption. Their filtration performance falls between that of RO and reverse osmosis membranes, typically maintaining water's mineral content and pH level better. This significantly reduces the pressure on the front-end treatment of the RO system, lowering the workload and burden on subsequent RO membranes, and improving the equipment's processing efficiency and lifespan.

[0007] Therefore, how to provide a solution that can improve the treatment efficiency of ultrapure water systems, effectively combine low-energy nanofiltration membranes with RO technology, and enhance the intelligent control between the components of ultrapure water systems has become a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a dual-membrane combination ultrapure water system, which adopts combined membrane technology and aims to optimize the preparation efficiency and water quality of ultrapure water.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0010] In a first aspect of the present invention, a dual-membrane combined ultrapure water system is provided, comprising:

[0011] The dual-membrane combination system is used to filter water sources. The dual-membrane combination system includes a nanofiltration membrane module and an RO membrane module. The nanofiltration membrane module and the RO membrane module are further divided into different numbers of nanofiltration membrane components and RO membrane components. The nanofiltration membrane module and the RO membrane module are set in series. The nanofiltration membrane module is used for pre-treatment filtration, and the RO membrane module is used for precision filtration.

[0012] The dynamic pressure regulation system is used to dynamically adjust the pressure based on the monitoring of the dual-membrane combination system. The dynamic pressure regulation system includes a pressure pump, a numerical control system, a flow sensor, a pressure sensor, and a water quality sensor. It is used to monitor the working status of the nanofiltration membrane module and the RO membrane module and adjust the output of the pressure pump. When the water quality gradually improves, the working pressure of the RO membrane module is gradually reduced; when the water quality gradually deteriorates, the working pressure of the RO membrane module is gradually increased.

[0013] The integrated module connects different nanofiltration membrane modules, RO membrane modules, and pressure pumps, and adjusts the number of nanofiltration and RO membrane modules in the system via piping. The integrated module includes a central control system and connecting piping. When water quality gradually declines, the central control system adjusts via the connecting piping; once the current RO membrane module reaches its operating pressure limit, it automatically switches to add more RO membrane modules. When water quality gradually improves, it reduces the number of RO membrane modules used in the connecting piping.

[0014] The intelligent control and monitoring system is used to connect to the CNC system, flow sensor, pressure sensor and water quality sensor respectively, and perform real-time data analysis and processing. The intelligent control and monitoring system includes an intelligent control system and a wireless connection module. The intelligent control system is used to set thresholds and assist the central control system in adjustment.

[0015] The high-efficiency cleaning and regeneration system is used to clean the dual-membrane combination system. The high-efficiency cleaning and regeneration system includes a backflushing pipe, a chemical cleaning solution, and a cleaning solution pump. It cleans the dual-membrane combination system at a set cleaning time or based on feedback from an intelligent control and monitoring system.

[0016] Preferably, in the dynamic pressure regulation system, the water quality sensor includes a pH sensor and a conductivity sensor, and the water quality threshold is set by the data collected by the pH sensor and the conductivity sensor.

[0017] The operating states of the nanofiltration and RO membranes are regulated by flow and pressure sensors. Water quality is monitored between the nanofiltration and RO membranes via a conductivity sensor. When the water quality after the nanofiltration membrane does not meet the requirements as detected by the conductivity sensor, the RO membrane pressure is adjusted or the RO membrane operation mode is changed based on the flow and pressure sensors, forming a dynamic pressure regulation system that provides feedback regulation to the dual-membrane combination system.

[0018] Preferably, in the dual-membrane combination system: the inlet flow rate of the nanofiltration membrane module is 10-30 L / h / m2, and the inlet flow rate of the nanofiltration membrane module is controlled by a flow regulating valve; the working pressure of the RO membrane module is set between 8-15 bar, and the inlet pressure of the RO membrane module is adjusted by the CNC system according to the water quality feedback of the nanofiltration membrane module; the water conductivity detection threshold of the conductivity sensor is below 1 μS / cm. If the set threshold is exceeded, the intelligent control and monitoring system will trigger the RO membrane cleaning process or replacement process.

[0019] Preferably, the conductivity of the influent and the RO membrane pressure detected by the conductivity sensor are positively correlated, and the intelligent control and monitoring system and the dynamic pressure regulation system are data coupled.

[0020] Preferably, the intelligent control system includes a cleaning setting based on time intervals and thresholds, and the timing of the time intervals is negatively correlated with the frequency at which the thresholds are approached.

[0021] Preferably, in the high-efficiency cleaning and regeneration system, the flow rate of the chemical cleaning fluid is between 20-30 L / h; the cleaning time of the reverse cleaning tube is 10-30 minutes, and the chemical cleaning time is 30-60 minutes, which is adjusted by the high-efficiency cleaning and regeneration system according to the intelligent control system, and the appropriate concentration of the chemical cleaning fluid is selected based on the type of pollution, such as organic pollution or inorganic scaling.

[0022] In a second aspect of the present invention, a water source production process for a dual-membrane combined ultrapure water system is provided for implementing the system described in the first aspect, the specific steps of which are as follows:

[0023] S1. In the water inlet stage, the pressure pump pumps the water source into the dual-membrane combination system. The water first enters the nanofiltration membrane module. The dynamic pressure regulation system adjusts the filtration of the nanofiltration membrane module based on the water quality information collected from the water that does not enter the nanofiltration membrane module, including conductivity, turbidity and water flow rate. When the water quality is good, the pressure of the nanofiltration membrane is reduced, and when the water quality is poor, the pressure of the nanofiltration membrane is increased.

[0024] S2. In the secondary filtration stage, the water source is tested again between the nanofiltration membrane module and the RO membrane module. The dynamic pressure regulation system adjusts the inlet pressure and flow rate of the RO membrane module under the intelligent control system of the intelligent control and monitoring system. After receiving the data collected by the dynamic pressure regulation system, the RO membrane module is adjusted again based on the conductivity sensor. When the water conductivity is good, the working pressure of the RO membrane module is reduced, thereby saving energy. When the water conductivity is poor, the pressure is increased to ensure the filtration effect of the RO membrane module.

[0025] S3. Circulation treatment: The intelligent control system continuously monitors the water filtration quality and pollution level of the nanofiltration and RO membrane modules in the dual-membrane combination system; after the secondary filtration stage, the number of nanofiltration and RO membrane modules is adjusted according to the water filtration quality based on the central control system; after the secondary filtration stage, the target nanofiltration and RO membrane modules are circulated and cleaned according to the pollution level by the high-efficiency cleaning and regeneration system.

[0026] S4. Self-cleaning timing adjustment combines the conductivity threshold and cleaning cycle set by the intelligent control system. When the water quality approaches the conductivity threshold, the intelligent control system adjusts the working state of the RO membrane module based on the dynamic pressure regulation system and records the interval until the next time the water quality approaches the conductivity threshold. When the interval time tends to decrease, the interval time of the cleaning cycle is reduced proportionally.

[0027] In a third aspect of the invention, a computer device is provided, including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the system functions of the first aspect or the method steps of the second aspect.

[0028] In a fourth aspect of the invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the system functions of the first aspect or the method steps of the second aspect.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. This invention combines two types of membranes in a reasonable way to give full play to their respective advantages. At the same time, according to system control, the system can dynamically adjust the usage load of the RO membrane. Furthermore, it can combine the self-cleaning number and water conductivity to improve the overall water quality and reduce the energy consumption of the equipment.

[0031] 2: This invention not only combines the advantages of nanofiltration membranes and reverse osmosis membranes, optimizing the water treatment process, improving energy efficiency and enhancing the system's intelligence level, but also achieves significant advantages in environmental protection, energy saving, maintainability and flexibility. The modular design also makes it easier to add, remove and replace nanofiltration membrane modules and RO membrane modules in the pipeline. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the overall system of the present invention;

[0034] Figure 2 This is a schematic diagram of the process flow of the present invention. Detailed Implementation

[0035] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0036] In the first embodiment, as Figure 1-2 As shown, the present invention provides a dual-membrane combined ultrapure water system, comprising:

[0037] The dual-membrane combination system is used to filter water sources. The dual-membrane combination system includes a nanofiltration membrane module and an RO membrane module. The nanofiltration membrane module and the RO membrane module are further divided into different numbers of nanofiltration membrane components and RO membrane components. The nanofiltration membrane module and the RO membrane module are set in series. The nanofiltration membrane module is used for pre-treatment filtration, and the RO membrane module is used for precision filtration.

[0038] The dynamic pressure regulation system is used to dynamically adjust the pressure based on the monitoring of the dual-membrane combination system. The dynamic pressure regulation system includes a pressure pump, a numerical control system, a flow sensor, a pressure sensor, and a water quality sensor. It is used to monitor the working status of the nanofiltration membrane module and the RO membrane module and adjust the output of the pressure pump. When the water quality gradually improves, the working pressure of the RO membrane module is gradually reduced; when the water quality gradually deteriorates, the working pressure of the RO membrane module is gradually increased.

[0039] The integrated module connects different nanofiltration membrane modules, RO membrane modules, and pressure pumps, and adjusts the number of nanofiltration and RO membrane modules in the system via piping. The integrated module includes a central control system and connecting piping. When water quality gradually declines, the central control system adjusts via the connecting piping; once the current RO membrane module reaches its operating pressure limit, it automatically switches to add more RO membrane modules. When water quality gradually improves, it reduces the number of RO membrane modules used in the connecting piping.

[0040] The intelligent control and monitoring system is used to connect to the CNC system, flow sensor, pressure sensor and water quality sensor respectively, and perform real-time data analysis and processing. The intelligent control and monitoring system includes an intelligent control system and a wireless connection module. The intelligent control system is used to set thresholds and assist the central control system in adjustment.

[0041] The high-efficiency cleaning and regeneration system is used to clean the dual-membrane combination system. The high-efficiency cleaning and regeneration system includes a backflushing pipe, a chemical cleaning solution, and a cleaning solution pump. It cleans the dual-membrane combination system at a set cleaning time or based on feedback from an intelligent control and monitoring system.

[0042] Furthermore, in the dynamic pressure regulation system, the water quality sensors include a pH sensor and a conductivity sensor. The water quality threshold is set by the data collected by the pH sensor and the conductivity sensor. The operating state of the nanofiltration membrane and the RO membrane is regulated by the flow sensor and the pressure sensor. The water quality between the nanofiltration membrane and the RO membrane is monitored by the conductivity sensor. When the water quality after the nanofiltration membrane does not meet the requirements under the detection of the conductivity sensor, the RO membrane pressure is adjusted or the operating mode of the RO membrane is changed according to the flow sensor and the pressure sensor, forming a feedback regulation of the dual membrane combination system by the dynamic pressure regulation system.

[0043] Furthermore, in the dual-membrane combination system: the influent flow rate of the nanofiltration membrane module is 10-30 L / h / m³. 2 The nanofiltration membrane module controls the inlet water flow through a flow regulating valve; the working pressure of the RO membrane module is set between 8-15 bar, and the CNC system adjusts the inlet water pressure of the RO membrane module based on the water quality feedback from the nanofiltration membrane module; the water conductivity detection threshold of the conductivity sensor is below 1 μS / cm. If the set threshold is exceeded, the intelligent control and monitoring system will trigger the RO membrane cleaning process or replacement process.

[0044] Furthermore, the conductivity of the influent detected by the conductivity sensor is positively correlated with the RO membrane pressure, and the intelligent control and monitoring system is data-coupled with the dynamic pressure regulation system.

[0045] Furthermore, the intelligent control system includes cleaning settings based on time intervals and thresholds, and the timing of the time intervals is negatively correlated with the frequency at which the thresholds are approached.

[0046] Furthermore, in the high-efficiency cleaning and regeneration system, the flow rate of the chemical cleaning fluid is between 20-30 L / h; the cleaning time of the reverse cleaning tube is 10-30 minutes, and the chemical cleaning time is 30-60 minutes, which is adjusted by the high-efficiency cleaning and regeneration system according to the intelligent control system, and the appropriate concentration of the chemical cleaning fluid is selected based on the type of pollution, such as organic pollution or inorganic scaling.

[0047] Specifically, in the water treatment process, such as Figure 1-2 As shown, the pressure pump of the dynamic adjustment system pumps the water source into the dual-membrane combination system, and after passing through the nanofiltration membrane module and the RO membrane module, it is treated into ultrapure water;

[0048] In the treatment process, the water source for the nanofiltration and RO membrane modules can be regulated by a pressure pump, allowing the inlet water pressure of the nanofiltration and RO membrane modules to adjust automatically. This is mainly controlled by the flow regulating valve under the dynamic pressure regulation system. The dynamic pressure regulation system is based on the data recording of the flow sensor, pressure sensor, and water quality sensor by the CNC system to form data acquisition at the nanofiltration and RO membrane module stages. After the acquired data is arranged in time sequence, the CNC system adjusts the pressure according to the inlet water conductivity. For example, if the inlet water conductivity is lower than 0.5 μS / cm, the RO membrane module pressure can be set to 10 bar; if the inlet water conductivity is higher than 0.5 μS / cm, the pressure needs to be increased to above 12 bar to make the inlet water conductivity and RO membrane module pressure positively correlated, thereby adjusting the overall power and achieving the effect of intelligent control.

[0049] The CNC system also sends the collected data to the intelligent control system of the intelligent control and monitoring system. The intelligent control and monitoring system can then transmit the data to a terminal, such as a data terminal or mobile terminal (e.g., a smartphone or computer), via a wireless connection module for direct viewing and adjustment. When adjustments are needed based on the water inflow, the intelligent control system can adjust the connected pipelines through the action of the integrated module's central control system. Figure 2 As shown, after the pressure pump pumps the water source into the nanofiltration membrane module or RO membrane module, multiple different nanofiltration membrane modules or RO membrane modules can be connected in series as needed. That is, during the initial design, appropriate components are selected to form the connecting pipeline. The number of components connected in series is selected by the opening and closing of the valves in the connecting pipeline to meet the water treatment requirements. When necessary, it can also facilitate the replacement, upgrading and cleaning of itself. For example, the pressure pump can bypass nanofiltration membrane module 1 and go directly to nanofiltration membrane module 2 and nanofiltration membrane module 3, and return from nanofiltration membrane module 3 to the output end of the connecting pipeline to the RO membrane module. When combined with a dynamic pressure regulation system, the number of components used can be increased according to the actual water quality requirements, so as to control the water quality within a certain range.

[0050] After prolonged use, the nanofiltration membrane module and RO membrane module will also accumulate fouling. Therefore, an external high-efficiency cleaning and regeneration system is also provided, which is regulated by the intelligent control system. The intelligent control system can set the alarm threshold for water conductivity and the cleaning cycle. In the case of direct control, the user can set a fixed interval time and set the alarm threshold for water conductivity. When the water quality exceeds the alarm threshold, the system will stop and trigger an alarm.

[0051] When the intelligent control is started, cleaning will be triggered when the water quality conductivity approaches the threshold. In order to reduce the impact of pipeline blockage and the dirt of the dual-membrane combination system itself on the water quality and keep the finally output ultrapure water always within the median value range, the intelligent control system will establish a linear relationship between the interval time of cleaning the filter membrane and the water quality conductivity. The interval time of cleaning the filter membrane is T, the water quality conductivity is C, the initial cleaning interval time is T0, and the conductivity change coefficient is k. k is a dimensionless number, and the formula is:

[0052] T = T0 - k(C - C0);

[0053] Where, C0 is the initial conductivity (μS / cm). When C > C0, the conductivity rises, and k×(C - C0) is the reduction amount of the cleaning interval time caused by the rise of the conductivity.

[0054] When the water quality conductivity drops, the time for cleaning the filter membrane increases, and the formula is:

[0055] T = T0 + k(C0 - C);

[0056] Where, when C < C0, the conductivity drops, and k×(C0 - C) is the increase amount of the cleaning interval time caused by the drop of the conductivity;

[0057] The value of k needs to be determined according to the different characteristics of the nanofiltration membrane and RO membrane, the water quality situation, and the usage environment of the equipment. Under normal usage conditions, the value of k generally ranges from 0.02 to 0.03.

[0058] On this basis, it is also possible to build a model based on the above data. After long-term use, the intelligent control reduces or increases the working pressure in the dual-membrane combination system. When the time for cleaning the filter membrane increases, the working pressure of the dual-membrane combination system can be appropriately reduced. When the time for cleaning the filter membrane is shortened, the working pressure can be appropriately increased or the components participating in the nanofiltration membrane module and RO membrane module can be adjusted and increased by the connecting pipeline.

[0059] In the actual cooperative cleaning process of the high-efficiency cleaning and regeneration system, after being triggered, the chemical cleaning solution will enter the backwashing pipeline to perform membrane regeneration operations on the target area.

[0060] Its overall system structure enables the dual-membrane combination system to maintain a long-term use state, ultimately achieving the effects of intelligent control, intelligent cleaning, and self-regulating power. On the basis of reducing power consumption, the water quality of the effluent is always maintained within a certain range. And when necessary, since the multiple modules are separately designed and not in a tightly coupled relationship, each system can operate independently. At the same time, between modules and between components, they can be separately disassembled and used. Compared with the existing technology, it has significant advantages in environmental protection, energy conservation, ease of maintenance, and increased maintainability.

[0061] In another embodiment, the present invention provides a water source production process for a dual-membrane combined ultrapure water system, used to implement the system of the first embodiment, characterized by the following specific steps:

[0062] S1. In the water inlet stage, the pressure pump pumps the water source into the dual-membrane combination system. The water first enters the nanofiltration membrane module. The dynamic pressure regulation system adjusts the filtration of the nanofiltration membrane module based on the water quality information collected from the water that does not enter the nanofiltration membrane module, including conductivity, turbidity and water flow rate. When the water quality is good, the pressure of the nanofiltration membrane is reduced, and when the water quality is poor, the pressure of the nanofiltration membrane is increased.

[0063] S2. In the secondary filtration stage, the water source is tested again between the nanofiltration membrane module and the RO membrane module. The dynamic pressure regulation system adjusts the inlet pressure and flow rate of the RO membrane module under the intelligent control system of the intelligent control and monitoring system. After receiving the data collected by the dynamic pressure regulation system, the RO membrane module is adjusted again based on the conductivity sensor. When the water conductivity is good, the working pressure of the RO membrane module is reduced, thereby saving energy. When the water conductivity is poor, the pressure is increased to ensure the filtration effect of the RO membrane module.

[0064] S3. Circulation treatment: The intelligent control system continuously monitors the water filtration quality and pollution level of the nanofiltration and RO membrane modules in the dual-membrane combination system; after the secondary filtration stage, the number of nanofiltration and RO membrane modules is adjusted according to the water filtration quality based on the central control system; after the secondary filtration stage, the target nanofiltration and RO membrane modules are circulated and cleaned according to the pollution level by the high-efficiency cleaning and regeneration system.

[0065] S4. Self-cleaning timing adjustment combines the conductivity threshold and cleaning cycle set by the intelligent control system. When the water quality approaches the conductivity threshold, the intelligent control system adjusts the working state of the RO membrane module based on the dynamic pressure regulation system and records the interval until the next time the water quality approaches the conductivity threshold. When the interval time tends to decrease, the interval time of the cleaning cycle is reduced proportionally.

[0066] In another embodiment, the present invention provides a computer device including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the system functions of the first embodiment or the method steps of the second embodiment.

[0067] In another embodiment, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the system functions of the first embodiment or the method steps of the second embodiment.

[0068] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-membrane combined ultrapure water system, characterized in that, include: The dual-membrane system is used to filter water sources. It includes a nanofiltration membrane module and an RO membrane module. Each nanofiltration and RO membrane module is further divided into different numbers of nanofiltration membrane elements and RO membrane elements. The nanofiltration and RO membrane modules are connected in series. The nanofiltration membrane module performs pre-treatment filtration, while the RO membrane module performs precision filtration. Each nanofiltration membrane module includes nanofiltration membrane elements, and each RO membrane module includes RO membrane elements. The dynamic pressure regulation system is used to dynamically adjust the pressure based on the monitoring of the dual-membrane combination system. The dynamic pressure regulation system includes a pressure pump, a numerical control system, a flow sensor, a pressure sensor, and a water quality sensor. It is used to monitor the working status of the nanofiltration membrane module and the RO membrane module and adjust the output of the pressure pump. When the water quality gradually improves, the working pressure of the RO membrane module is gradually reduced; when the water quality gradually deteriorates, the working pressure of the RO membrane module is gradually increased. The integrated module connects different nanofiltration membrane modules, RO membrane modules, and pressure pumps, and adjusts the number of nanofiltration and RO membrane modules in the system via piping. The integrated module includes a central control system and connecting piping. When water quality gradually declines, the central control system adjusts via the connecting piping; once the current RO membrane module reaches its operating pressure limit, it automatically switches to add more RO membrane modules. When water quality gradually improves, it reduces the number of RO membrane modules used in the connecting piping. The high-efficiency cleaning and regeneration system is used to clean the dual-membrane combination system. The high-efficiency cleaning and regeneration system includes a backflushing pipe, a chemical cleaning solution and a cleaning solution pump. The chemical cleaning solution pumped by the cleaning solution pump, or in conjunction with the backflushing pipe, cleans the dual-membrane combination system. The intelligent control and monitoring system is used to connect to the CNC system, flow sensor, pressure sensor, and water quality sensor respectively, and to perform real-time data analysis and processing. The intelligent control and monitoring system includes an intelligent control system and a wireless connection module. The intelligent control system is used to set thresholds to assist the central control system in adjustment, and to set the cleaning frequency of the high-efficiency cleaning and regeneration system. The intelligent control system receives water quality information, including water conductivity, from the dynamic pressure regulation system. The intelligent control system then adjusts the cleaning interval of the high-efficiency cleaning and regeneration system based on the water conductivity information, and completes the self-cleaning operation of the dual-membrane combination system by starting the cleaning fluid pump.

2. The ultrapure water system with a dual-membrane combination according to claim 1, characterized in that, In the dynamic pressure regulation system, the water quality sensor includes a pH sensor and a conductivity sensor, and the water quality threshold is set by the data collected by the pH sensor and the conductivity sensor. The operating states of the nanofiltration and RO membranes are regulated by flow and pressure sensors. Water quality is monitored between the nanofiltration and RO membranes via a conductivity sensor. When the water quality after the nanofiltration membrane does not meet the threshold set by the numerical control system as detected by the conductivity sensor, the RO membrane pressure is adjusted or the RO membrane operating mode is changed according to the flow and pressure sensors, forming a dynamic pressure regulation system that provides feedback regulation to the dual-membrane combination system.

3. The ultrapure water system with a dual-membrane combination according to claim 2, characterized in that, In the dual-membrane system: the influent flow rate of the nanofiltration membrane module is 10-30 L / h / m 2 The nanofiltration membrane module controls the inlet water flow through a flow regulating valve; the working pressure of the RO membrane module is set between 8-15 bar, and the CNC system adjusts the inlet water pressure of the RO membrane module based on the water quality feedback from the nanofiltration membrane module; the water conductivity detection threshold of the conductivity sensor is below 1 μS / cm. If the set threshold is exceeded, the intelligent control and monitoring system will trigger the RO membrane cleaning process or replacement process.

4. The ultrapure water system with a dual-membrane combination according to claim 3, characterized in that, The conductivity of the influent detected by the conductivity sensor is positively correlated with the RO membrane pressure, and the intelligent control and monitoring system is data-coupled with the dynamic pressure regulation system; the influent pressure of a single nanofiltration membrane module or RO membrane module is controlled by a flow regulating valve.

5. The ultrapure water system with a dual-membrane combination according to claim 1, characterized in that, The intelligent control system includes a cleaning setting based on time intervals and thresholds, and the timing of the time intervals is negatively correlated with the frequency at which the thresholds are approached.

6. The ultrapure water system with a dual-membrane combination according to claim 1, characterized in that, In the high-efficiency cleaning and regeneration system, the flow rate of the chemical cleaning fluid is between 20-30 L / h; the cleaning time of the reverse cleaning tube is 10-30 minutes, and the chemical cleaning time is 30-60 minutes, which is adjusted by the high-efficiency cleaning and regeneration system according to the intelligent control system, and the appropriate concentration of the chemical cleaning fluid is selected based on the type of pollution, such as organic pollution or inorganic scaling.

7. A water source production process for a dual-membrane combined ultrapure water system, used to implement the system described in any one of claims 1-6, characterized in that, The specific steps are as follows: S1. In the water inlet stage, the pressure pump pumps the water source into the dual-membrane combination system. The water first enters the nanofiltration membrane module. The dynamic pressure regulation system adjusts the filtration of the nanofiltration membrane module based on the water quality information collected from the water that does not enter the nanofiltration membrane module, including conductivity, turbidity and water flow rate. When the water quality is good, the pressure of the nanofiltration membrane is reduced, and when the water quality is poor, the pressure of the nanofiltration membrane is increased. S2. In the secondary filtration stage, the water source is tested again between the nanofiltration membrane module and the RO membrane module. The dynamic pressure regulation system adjusts the inlet pressure and flow rate of the RO membrane module under the intelligent control system of the intelligent control and monitoring system. After receiving the data collected by the dynamic pressure regulation system, the RO membrane module is adjusted again based on the conductivity sensor. When the water conductivity is good, the working pressure of the RO membrane module is reduced, thereby saving energy. When the water conductivity is poor, the pressure is increased to ensure the filtration effect of the RO membrane module. S3. Circulation treatment: The intelligent control system continuously monitors the water filtration quality and pollution level of the nanofiltration and RO membrane modules in the dual-membrane combination system; after the secondary filtration stage, the number of nanofiltration and RO membrane modules is adjusted according to the water filtration quality based on the central control system. After the secondary filtration stage, the target nanofiltration membrane module and RO membrane module are cyclically cleaned by a high-efficiency cleaning and regeneration system according to the degree of pollution. S4. Self-cleaning timing adjustment combines the conductivity threshold and cleaning cycle set by the intelligent control system. When the water quality approaches the conductivity threshold, the intelligent control system adjusts the working state of the RO membrane module based on the dynamic pressure regulation system and records the interval until the next time the water quality approaches the conductivity threshold. When the interval time tends to decrease, the interval time of the cleaning cycle is reduced proportionally.

8. A computer device comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the system function of any one of claims 1-6 or the process steps of claim 7.

9. A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the system function of any one of claims 1-6 or the process steps of claim 7.

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