Double-membrane combined ultrapure water machine system

Abstract

The invention discloses a double-membrane combined ultrapure water machine system, which comprises a double-membrane combined system, a dynamic pressure regulation system; an integrated module; an intelligent control and monitoring system; the invention discloses an efficient cleaning and regenerating system. The two membranes are reasonably combined, respective advantages are exerted, meanwhile, according to system control, the system can dynamically adjust the use burden of the RO membrane, the combination of the self-cleaning number and the water quality conductivity can be further combined, and therefore the overall water quality is improved, and the energy consumption of equipment is reduced. According to the invention, the advantages of the nanofiltration membrane and the reverse osmosis membrane are combined, the water treatment process is optimized, the energy efficiency is improved, the intelligent level of the system is enhanced, and remarkable advantages in the aspects of environmental protection, energy conservation, maintainability and flexibility are realized; and the modularized design is more convenient for increasing, decreasing, replacing and the like of the nanofiltration membrane module and the RO membrane module in the pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of ultrapure water machines, and in particular to an ultrapure water machine system with a double membrane combination. Background Art

[0002] The ultrapure water equipment currently available on the market is usually based on reverse osmosis (RO) technology for water treatment, but most of the equipment has the following problems:

[0003] (1) Low energy efficiency: The high energy consumption of RO membrane makes the overall operating cost of the equipment high.

[0004] (2) Membrane contamination problem: RO membranes are easily contaminated and need to be frequently cleaned or replaced.

[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] At the same time, RO technology uses the properties of semi-permeable membranes to pass water molecules through the membrane surface by applying high pressure, which can filter out most of the dissolved solids, bacteria, viruses and organic matter, with a very high removal rate. However, due to its filtration principle, RO membranes often have poor removal effects on certain tiny ions in water (such as silicates, ammonia, fluorine, etc.), or require high energy consumption. Therefore, more and more research and practice attempts to combine other membrane technologies (such as nanofiltration membranes) with RO technology to achieve more efficient and energy-saving ultrapure water preparation. Nanofiltration membranes (NF) have larger pore sizes and higher fluxes, and can remove some medium-sized organic molecules and divalent metal ions at lower energy consumption. Their filtration performance is between that of RO membranes and reverse osmosis membranes, and they can usually better maintain the minerals and pH value of water. At the same time, this greatly reduces the front-end processing pressure of the RO system, reduces the working pressure and burden of subsequent RO membranes, and improves the processing efficiency and life of the equipment.

[0007] Therefore, how to provide a method for improving the processing efficiency of ultrapure water machines, effectively combining low-energy nanofiltration membranes with RO technology, and improving the intelligent control between ultrapure water machine system components has become a technical problem to be solved by technicians in this field. 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 an ultrapure water machine system with a double membrane combination, which adopts a combined membrane technology and aims to optimize the preparation efficiency and water quality of ultrapure water.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions:

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

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

[0012] The dynamic pressure regulation system is used to form dynamic regulation according to 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 increases, 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 is used to connect different nanofiltration membrane modules, RO membrane modules and pressure pumps respectively, and adjust the number of nanofiltration membrane components and RO membrane components in the system through pipelines. The integrated module includes a central control system and connecting pipelines. When the water quality gradually decreases, the central control system adjusts through the connecting pipelines. When the working pressure of the current RO membrane component reaches the upper limit, it automatically switches to add more RO membrane components; when the water quality gradually increases, the use of RO membrane components in the connecting pipelines is reduced;

[0014] Intelligent control and monitoring system, used to connect the numerical control system, flow sensor, pressure sensor and water quality sensor respectively, to perform data analysis and processing in real time. 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 making adjustments.

[0015] The high-efficiency cleaning and regeneration system is used to clean the double-membrane combination system. The high-efficiency cleaning and regeneration system includes a backwash pipe, chemical cleaning liquid and a cleaning liquid pump. The double-membrane combination system is cleaned at the set cleaning time or based on the feedback of the 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 is set by the threshold value of the data collected by the pH sensor and the conductivity sensor;

[0017] The working states of the nanofiltration membrane and the RO membrane are regulated by the flow sensor and the pressure sensor. The water quality is monitored by the conductivity sensor between the nanofiltration membrane and the RO membrane. 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 operation mode of the RO membrane is changed according to the flow sensor and the pressure sensor, forming a dynamic pressure regulation system to feedback regulation of the dual membrane combination system.

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

[0019] Preferably, the inlet water conductivity 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.

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

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

[0022] In a second aspect of the present invention, a water source production process of an ultrapure water machine with a double membrane combination is provided, which is used to implement the system described in the first aspect, and the specific steps are as follows:

[0023] S1. In the water inlet stage, the pressure pump pumps the water source into the double membrane combination system, and the water first enters the nanofiltration membrane module. The dynamic pressure regulation system collects information about the water quality that has not entered the nanofiltration membrane module, including conductivity, turbidity and water flow, to adjust the filtration of the nanofiltration membrane module; 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. During 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 water inlet pressure and flow 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 according to the conductivity sensor; when the water conductivity is good, the working pressure of the RO membrane module is reduced to save 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 degree of the nanofiltration membrane module and RO membrane module under the dual membrane combination system; after the secondary filtration stage, the central control system adjusts the increase or decrease of different numbers of nanofiltration membrane components and RO membrane components according to the water filtration quality; after the secondary filtration stage, the target nanofiltration membrane components and RO membrane components are circulated and cleaned by the high-efficiency cleaning and regeneration system according to the pollution degree;

[0026] S4. Timing adjustment of self-cleaning combines the conductivity threshold and cleaning cycle set by the intelligent control system. When the water quality is close to 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 is close to 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 present invention, a computer device is provided, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor implements the system functions of the first aspect or the method steps of the second aspect when executing the computer program.

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

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1: The present invention reasonably combines the two membranes to give full play to their respective advantages. At the same time, according to system control, the system can dynamically adjust the usage burden of the RO membrane. It can also further combine the self-cleaning number and water conductivity to improve the overall water quality and reduce the energy consumption of the equipment.

[0031] 2: The present invention not only combines the advantages of nanofiltration membrane and reverse osmosis membrane, optimizes the water treatment process, improves energy efficiency and enhances the intelligence level of the system, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

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

[0034] Figure 2 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

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

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

[0038] The dynamic pressure regulation system is used to form dynamic regulation according to 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 increases, 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 is used to connect different nanofiltration membrane modules, RO membrane modules and pressure pumps respectively, and adjust the number of nanofiltration membrane components and RO membrane components in the system through pipelines. The integrated module includes a central control system and connecting pipelines. When the water quality gradually decreases, the central control system adjusts through the connecting pipelines. When the working pressure of the current RO membrane component reaches the upper limit, it automatically switches to add more RO membrane components; when the water quality gradually increases, the use of RO membrane components in the connecting pipelines is reduced;

[0040] Intelligent control and monitoring system, used to connect the numerical control system, flow sensor, pressure sensor and water quality sensor respectively, to perform data analysis and processing in real time. 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 making adjustments.

[0041] The high-efficiency cleaning and regeneration system is used to clean the double-membrane combination system. The high-efficiency cleaning and regeneration system includes a backwash pipe, chemical cleaning liquid and a cleaning liquid pump. The double-membrane combination system is cleaned at the set cleaning time or based on the feedback of the intelligent control and monitoring system.

[0042] Furthermore, 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 working conditions of the nanofiltration membrane and the RO membrane are regulated by the flow sensor and the pressure sensor, and 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 operation mode of the RO membrane is changed according to the flow sensor and the pressure sensor, thereby 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 water inlet flow rate of the nanofiltration membrane module is 10-30L / h / m 2 The nanofiltration membrane module controls the water inlet flow rate through the flow regulating valve; the working pressure of the RO membrane module is set between 8-15bar, and the numerical control system adjusts the water inlet pressure of the RO membrane module according to the water quality feedback of the nanofiltration membrane module; the water conductivity detection threshold of the conductivity sensor is below 1μS / cm. If it exceeds the set threshold, the intelligent control and monitoring system will trigger the RO membrane cleaning process or replacement process.

[0044] Furthermore, the inlet water conductivity 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] Further, the intelligent control system includes a cleaning setting based on a time interval and a threshold setting, and the timing of the time interval is negatively correlated with the frequency at which the threshold is approached.

[0046] Furthermore, in the high-efficiency cleaning and regeneration system, the flow rate of the chemical cleaning liquid is between 20-30L / h; the cleaning time of the reverse cleaning pipe is 10-30 minutes, and the chemical cleaning time is 30-60 minutes. The high-efficiency cleaning and regeneration system is adjusted according to the intelligent control system and selects the appropriate chemical cleaning liquid concentration based on the pollution type of organic pollution and inorganic scaling.

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

[0048] In the treatment process, the water source at the nanofiltration membrane module and RO membrane module stage can be adjusted by a pressure pump, so that the inlet water pressure of the nanofiltration membrane module and the RO membrane module can be adjusted automatically, which is mainly controlled by the flow control valve under the dynamic pressure regulation system. The dynamic pressure regulation system is mainly based on the data recording of the flow sensor, pressure sensor and water quality sensor by the numerical control system to form data collection at the nanofiltration membrane module and RO membrane module stage. After the collected data is arranged in time sequence, the numerical control system itself forms an adjustment according to the inlet water conductivity. For example, if the inlet water conductivity is lower than 0.5μS / cm, the RO membrane module pressure can be set to 10bar; if the inlet water conductivity is higher than 0.5μS / cm, it needs to be pressurized to more than 12bar, so that the inlet water conductivity and the RO membrane module pressure are positively correlated, so as to adjust the overall power and achieve the effect of intelligent control;

[0049] The numerical control system will also send the collected data to the intelligent control system of the intelligent control and monitoring system. The intelligent control and monitoring system can send the data to the terminal based on the wireless connection module, that is, the data terminal or mobile terminal, such as a smart phone or computer device, to directly view and adjust; when it is necessary to adjust according to the water intake, the intelligent control system can adjust the integrated module through the action of the integrated module, and the central control system of the integrated module can adjust to the connecting pipeline, such as Figure 2 As shown, after the pressure pump pumps the water source into the nanofiltration membrane module or the RO membrane module, a plurality of different nanofiltration membrane components or RO membrane components can be connected in series as needed, that is, appropriate components are selected to form a connecting pipeline during the initial design, and the connecting pipeline selects the appropriate number of components in series by the opening and closing of the valve to meet the needs of water treatment, and can also facilitate its own replacement, upgrading and cleaning operations when necessary. For example, the pressure pump can bypass the nanofiltration membrane component 1 and directly reach the nanofiltration membrane component 2 and the nanofiltration membrane group 3, and return from the nanofiltration membrane component 3 to the output end of the connecting pipeline to the RO membrane module; when combined with the dynamic pressure regulation system, the number of components used can also be increased according to the actual water quality requirements, so as to control the water quality within a certain range.

[0050] After long-term use, the nanofiltration membrane module and the RO membrane module will also form dirt. Therefore, they are further connected to an efficient cleaning and regeneration system, which is also regulated by the intelligent control system. The alarm threshold and cleaning cycle of water conductivity can be set in the intelligent control system. Under direct control, users can set a fixed interval time and the alarm threshold of water conductivity. When the water quality exceeds the alarm threshold, it stops and triggers an alarm.

[0051] If the intelligent control is started, the cleaning will be triggered when the water 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 final output of ultrapure water always in 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 conductivity. The interval time of cleaning the filter membrane is T, the water conductivity is C, the initial cleaning interval time is T0, and the conductivity change coefficient is k, k is a dimensionless number, that is, the formula is:

[0052] T=T 0 -k(CC 0 );

[0053] Among them, C 0 is the initial conductivity (μS / cm), when C>C 0 When the conductivity increases, k×(CC 0 ) is the amount by which the cleaning interval is shortened due to increased conductivity.

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

[0055] T=T 0 +k(C 0 -C);

[0056] Among them, when C <C 0 When the conductivity decreases, k×(C 0 -C) is the increase in cleaning interval due to decreased conductivity;

[0057] The k value needs to be determined based on the different characteristics of the nanofiltration membrane and RO membrane, the water quality and the operating environment of the equipment. Under normal operating conditions, the k value is generally between 0.02 and 0.03.

[0058] On top of this, modeling can also be done based on the above data. After long-term use, intelligent control can be used to reduce or increase 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 connecting pipelines can be adjusted to increase the number of components participating in the nanofiltration membrane module and the RO membrane module.

[0059] In the actual coordinated cleaning process of the efficient cleaning and regeneration system, the chemical cleaning liquid will enter the backwash pipe after being triggered to regenerate the membrane in the target area.

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

[0061] In another embodiment, the present invention provides a water source production process for an ultrapure water machine with a double membrane combination, which is used to implement the system of the first embodiment, and is characterized in that the specific steps are as follows:

[0062] S1. In the water inlet stage, the pressure pump pumps the water source into the double membrane combination system, and the water first enters the nanofiltration membrane module. The dynamic pressure regulation system collects information about the water quality that has not entered the nanofiltration membrane module, including conductivity, turbidity and water flow, to adjust the filtration of the nanofiltration membrane module; 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. During 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 water inlet pressure and flow 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 according to the conductivity sensor; when the water conductivity is good, the working pressure of the RO membrane module is reduced to save 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 degree of the nanofiltration membrane module and RO membrane module under the dual membrane combination system; after the secondary filtration stage, the central control system adjusts the increase or decrease of different numbers of nanofiltration membrane components and RO membrane components according to the water filtration quality; after the secondary filtration stage, the target nanofiltration membrane components and RO membrane components are circulated and cleaned by the high-efficiency cleaning and regeneration system according to the pollution degree;

[0065] S4. Timing adjustment of self-cleaning combines the conductivity threshold and cleaning cycle set by the intelligent control system. When the water quality is close to 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 is close to 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 implements the system functions of the first embodiment or the method steps of the second embodiment when executing the computer program.

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

[0068] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-membrane ultrapure water system, characterized in that: include: A double membrane combination system is used to filter water sources. The double membrane combination system includes a nanofiltration membrane module and an RO membrane module. The nanofiltration membrane module and the RO membrane module are divided into different numbers of nanofiltration membrane components and RO membrane components. The nanofiltration membrane module and the RO membrane module are arranged in series, wherein the nanofiltration membrane module is for pre-treatment filtration, and the RO membrane module is for precision filtration; the nanofiltration membrane module includes a nanofiltration membrane component, and the RO membrane module includes an RO membrane component; The dynamic pressure regulation system is used to form dynamic regulation according to 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 increases, 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 is used to connect different nanofiltration membrane modules, RO membrane modules and pressure pumps respectively, and adjust the number of nanofiltration membrane components and RO membrane components in the system through pipelines. The integrated module includes a central control system and connecting pipelines. When the water quality gradually decreases, the central control system adjusts through the connecting pipelines. When the working pressure of the current RO membrane component reaches the upper limit, it automatically switches to add more RO membrane components; when the water quality gradually increases, the use of RO membrane components in the connecting pipelines is reduced; The high-efficiency cleaning and regeneration system is used to clean the double-membrane combination system. The high-efficiency cleaning and regeneration system includes a backwashing pipe, a chemical cleaning liquid and a cleaning liquid pump. The chemical cleaning liquid pumped out by the cleaning liquid pump or in conjunction with the backwashing pipe cleaning can clean the double-membrane combination system. The intelligent control and monitoring system is used to connect the numerical control system, flow sensor, pressure sensor and water quality sensor respectively 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, assist the central control system in adjustment, and set the cleaning frequency of the high-efficiency cleaning and regeneration system. Among them, the intelligent control system receives water quality information transmitted by the dynamic pressure regulation system. The water quality information includes water conductivity. The intelligent control system then adjusts the cleaning interval of the high-efficiency cleaning and regeneration system according to the information of water conductivity, and completes the self-cleaning operation of the double-membrane combination system by starting the cleaning liquid pump.

2. The double-membrane ultrapure water system 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 is set by the data collected by the pH sensor and the conductivity sensor. The working states of the nanofiltration membrane and the RO membrane are 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 threshold set by the numerical control system under the detection of the conductivity sensor, the RO membrane pressure is adjusted or the operation mode of the RO membrane is changed according to the flow sensor and the pressure sensor, forming a dynamic pressure regulation system to feedback regulation of the dual membrane combination system.

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

4. The double-membrane ultrapure water system according to claim 3, characterized in that: The inlet water conductivity 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 inlet water pressure of a single nanofiltration membrane assembly or RO membrane assembly is controlled by a flow regulating valve.

5. The double-membrane combined ultrapure water machine system according to claim 1, characterized in that: The intelligent control system includes a cleaning setting based on a time interval and a threshold setting, and the timing of the time interval is negatively correlated with the frequency with which the threshold is approached.

6. The double-membrane combined ultrapure water machine system according to claim 1, characterized in that: In the high-efficiency cleaning and regeneration system, the flow rate of the chemical cleaning liquid is between 20-30 L / h; the cleaning time of the reverse cleaning pipe is 10-30 minutes, and the chemical cleaning time is 30-60 minutes. The high-efficiency cleaning and regeneration system is adjusted according to the intelligent control system and selects the appropriate chemical cleaning liquid concentration based on the pollution type of organic pollution and inorganic scaling.

7. A water source production process for a double-membrane ultrapure water machine, used to implement the system described in 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 double membrane combination system, and the water first enters the nanofiltration membrane module. The dynamic pressure regulation system collects information about the water quality that has not entered the nanofiltration membrane module, including conductivity, turbidity and water flow, to adjust the filtration of the nanofiltration membrane module; 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. During 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 water inlet pressure and flow 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 according to the conductivity sensor; when the water conductivity is good, the working pressure of the RO membrane module is reduced to save 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 degree of the nanofiltration membrane module and the RO membrane module under the dual membrane combination system; after the secondary filtration stage, the central control system adjusts the increase or decrease of different numbers of nanofiltration membrane components and RO membrane components according to the water filtration quality; After the secondary filtration stage, the target nanofiltration membrane components and RO membrane components are cyclically cleaned by the high-efficiency cleaning and regeneration system according to the degree of contamination; S4. Timing adjustment of self-cleaning combines the conductivity threshold and cleaning cycle set by the intelligent control system. When the water quality is close to 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 is close to 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 implements the system functions of any one of claims 1 to 6 or the method steps of claim 7 when executing the computer program.

9. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the system functions of any one of claims 1 to 6 or the method steps of claim 7.

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