Process industry whole membrane method water treatment operation system

Abstract

The invention discloses a whole-membrane-process water treatment operation system for a process industry. Comprising a raw water pump, a self-cleaning filter, an ultrafiltration device, an ultrafiltration water tank, an ultrafiltration water pump, a security filter, a first-stage water feeding pump, a first-stage reverse osmosis device, a water pump, a security filter, a second-stage water feeding pump, a second-stage reverse osmosis device, a fresh water tank, an EDI water feeding pump, a security filter and an EDI device which are sequentially connected through pipelines, the system is composed of an intelligent operation system of an ultrafiltration membrane system, an intelligent operation system of a reverse osmosis membrane system, an intelligent operation system of an EDI membrane system and dosing and cleaning auxiliary equipment. The system not only collects and stores production operation data in real time, visually displays the operation state of the membrane treatment equipment and gives an alarm in time, but also realizes accurate dosing control and energy-saving optimized operation by automatically diagnosing the membrane-method water treatment system equipment, so that the safety and economical efficiency of whole-process industrial water production are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment in process industries, and in particular to a full-membrane water treatment operation system in process industries. Background Art

[0002] Process industries primarily add value to raw materials through physical or chemical methods such as mixing, separation, crushing, and heating. These industries primarily include breweries, chemicals, oil refining, pharmaceuticals, and thermal power plants. Water treatment systems in these industries typically incorporate at least an ultrafiltration (UF) and reverse osmosis (RO) membrane pretreatment system and a desalination system. The full membrane water treatment process organically combines different membrane technologies, such as UF, microfiltration, RO, and EDI, to achieve efficient pollutant removal and deep desalination. Full membrane water treatment is an important treatment method in the boiler feed water treatment process. In recent years, with the increase in industrial steam consumption, the capacity of the boiler feed water treatment system has expanded accordingly. The full membrane water treatment system equipment needs to be equipped with multiple sets of ultrafiltration, reverse osmosis, EDI devices and other water treatment equipment. Its advantages are good effluent quality, stable operation, high degree of automation, simple operation, and high environmental benefits. Compared with conventional ion exchange technology, it also has the characteristics of small footprint and small maintenance, especially in systems with smaller output. Its disadvantages are: the repair and maintenance costs of the control system used in the full membrane water treatment system are high; the system equipment is of large types and quantity, and the drug consumption, electricity and water consumption are huge, which cannot meet the current energy conservation and emission reduction needs of more and more power plants.

[0003] The existing Chinese patent document with announcement number CN213357031U discloses a membrane-based wastewater treatment and reuse system. This solution generally involves sending wastewater to a sedimentation tank through a conveying pipe, precipitating sand and gravel and larger solids therein, and then subjecting the separated wastewater to impurity removal and purification treatment. The work is complex and energy-intensive, and the economic benefits of recycling cannot meet actual needs. The Chinese patent document with announcement number CN211554695U discloses a control system for a full-membrane water treatment system. This solution designs the control system, but does not specify specific signal parameters or design a specific cleaning and maintenance system, which will affect the service life of the reverse osmosis membrane and place higher requirements on subsequent processes.

[0004] In view of this, this application aims to develop a digital and intelligent operation system for full-membrane water treatment in process industries, automatically diagnose membrane water treatment system equipment, achieve precise dosing control, energy-saving and optimized operation, and thus achieve safety and economy in water production in process industries. Summary of the Invention

[0005] The purpose of the present invention is to provide a full membrane water treatment operation system for process industry, which can realize precise dosing control and energy-saving optimized operation through automatic diagnosis of membrane water treatment system equipment, thereby achieving safety and economy of water production in power plants.

[0006] To achieve the above-mentioned purpose, the present invention provides a process industry full membrane water treatment operation system, including an ultrafiltration membrane system intelligent operation system, a reverse osmosis membrane system intelligent operation system, an EDI membrane system intelligent operation system and a control system. The ultrafiltration membrane system intelligent operation system includes a raw water pump, a self-cleaning filter, an ultrafiltration device, an ultrafiltration water tank, an ultrafiltration water pump and a security filter connected in sequence through pipelines. The inlet and outlet of the ultrafiltration membrane system intelligent operation system are both equipped with pressure sensors for real-time detection of the inlet and outlet pressures. The ultrafiltration membrane system intelligent operation system is also provided with a differential pressure sensor for measuring the inlet and outlet pressure difference; a turbidity meter is installed on the water production pipeline of the ultrafiltration membrane system intelligent operation system for real-time detection of the turbidity of the produced water; a residual chlorine sensor and a temperature sensor are installed on the water inlet pipeline of the ultrafiltration membrane system intelligent operation system; the differential pressure sensor and the turbidity meter are both connected to the control system; the reverse osmosis membrane system intelligent operation system includes a primary water supply pump, a primary reverse osmosis device, a water pump, a security filter, a secondary water supply pump, a secondary reverse osmosis device and a fresh water tank connected in sequence through pipelines, the primary water supply pump is connected to the water production pipeline of the ultrafiltration membrane system intelligent operation system, the primary reverse The inlet of the osmosis device is connected to the outlet of the first-stage water pump. Multi-stage reverse osmosis components are installed in the first-stage reverse osmosis device and the second-stage reverse osmosis device. Pressure sensors are installed at the inlet and concentrated water outlet of each stage of the reverse osmosis membrane assembly to measure the transmembrane pressure difference of each stage; pressure switches are installed at the inlet and outlet of the first-stage fresh water pump to monitor the operating pressure and realize the protection function; flow meters are installed on the water inlet pipe and water production pipe of the intelligent operation system of the reverse osmosis membrane system to measure the water inlet flow and water production flow respectively; a conductivity meter is also installed on the water production pipe of the intelligent operation system of the reverse osmosis membrane system. Used to detect the conductivity of produced water in real time; the pressure sensor, pressure switch, flow meter, and conductivity meter are all connected to the control system; the EDI membrane system intelligent operation system includes an EDI water feed pump, a safety filter, and an EDI device connected in sequence via pipelines. The inlet of the EDI water feed pump is connected to the water production pipeline of the reverse osmosis membrane system intelligent operation system. The water inlet pipeline of the EDI membrane system intelligent operation system is installed with a water inlet flow meter, and the water production pipeline is equipped with a water production flow meter, a conductivity meter, and a SiO2 analyzer; the conductivity meter, SiO2 analyzer, and flow meter are all connected to the control system;

[0007] Among them, the water inlet pipe of the ultrafiltration membrane system intelligent operation system is also equipped with a dosing pump and a heater. The control system automatically adjusts the amount of bactericide added by the dosing pump according to the residual chlorine content of the inlet water detected by the residual chlorine sensor; the control system automatically adjusts the opening of the regulating valve of the heater according to the inlet water temperature detected by the temperature sensor; the ultrafiltration membrane system intelligent operation system and the EDI membrane system intelligent operation system are both equipped with a cleaning system, and the cleaning system is equipped with a chain water production program to ensure that at least one set of equipment operates normally during cleaning.

[0008] According to an embodiment of the present application, the water production pipeline of the EDI membrane system intelligent operation system is also connected to the desalted water tank. A desalted water pump is provided on the outlet pipe of the desalted water tank. The desalted water pump introduces the outlet water of the desalted water tank into the factory thermal system for utilization.

[0009] According to an embodiment of the present application, the control system includes a DCS controller and a human-machine interface. After receiving the signal, the DCS controller performs logical judgment and control according to the preset program and parameters. The human-machine interface is used for operators to set parameters, view real-time data and system operation status.

[0010] According to the embodiments of the present application, the intelligent operation system of the ultrafiltration membrane system automatically adjusts the dosage of the bactericide before ultrafiltration according to the residual chlorine content of the system inlet water; sets the temperature range of the ultrafiltration inlet water and automatically adjusts the opening of the regulating valve of the heater; controls the raw water pump by frequency conversion, increases the pressure and flow slowly at a low frequency, and ensures that the pressure and flow at the inlet of the intelligent operation system of the ultrafiltration membrane system are within the allowable range of the ultrafiltration membrane.

[0011] According to an embodiment of the present application, the control procedure of the cleaning system is: before each step using the flushing water pump, a flushing water pump call instruction is initiated, the instruction enters the instruction queue, and the flushing water pump calls the instruction according to the first-in-first-out logic. When a set of equipment to be cleaned uses the flushing water pump, the other equipment waits or operates normally.

[0012] According to the embodiments of the present application, the intelligent operation system of the reverse osmosis membrane system establishes data curves of inlet water temperature, inlet water pressure, water production, and high-pressure pump power consumption, and through comparative analysis and using a self-learning method, seeks to find suitable inlet water temperature and pressure values ​​through comparison to control the inlet water volume and high-pressure pump frequency; establishes data curves of inlet water pH value, ORP value, water production conductivity value, and free carbon dioxide value, and through comparative analysis and using a self-learning method, seeks to find suitable inlet water pH value through comparison to control the dosage.

[0013] According to the embodiment of the present application, the intelligent operation system of the EDI membrane system adopts variable frequency control to the EDI water feed pump based on the water inlet flowmeter, water production flowmeter, concentrate flow, water production conductivity, and water production SiO2, adjusts the EDI water inlet pressure and controls the EDI water inlet flow, and the EDI water production flow and concentrate flow are within the specified range.

[0014] According to an embodiment of the present application, the EDI device is provided with a concentrated water flow switch at the concentrated water outlet, a water supply flow sensor is provided on the water inlet pipe of the EDI device, and a water production flow sensor is provided on the water production pipe. The concentrated water flow switch is hard-wired to cut off the local EDI DC power supply, and the water supply flow sensor and the water production flow sensor are both telecommunication-connected to the control system, which issues an instruction to cut off the EDI DC power supply through the logical operation inside the control system.

[0015] According to the embodiment of the present application, the inlet residual chlorine value and ORP value of the reverse osmosis membrane system intelligent operation system are used to control the amount of reducing agent added, the residual chlorine value is controlled within 0.0PPM, and the corresponding ORP value is controlled within 150-200MV.

[0016] According to an embodiment of the present application, the pH of the inlet water of the EDI membrane system intelligent operation system is between 7 and 8.

[0017] The beneficial effects of the technical solution of the present invention compared with the prior art are:

[0018] 1. The full-membrane water treatment operation system of this application collects real-time operating data from the ultrafiltration membrane system intelligent operation system, the reverse osmosis membrane system intelligent operation system, and the EDI membrane system intelligent operation system to construct a fault diagnosis model and achieve intelligent monitoring and early warning. The system can accurately control the addition of reagents, optimize the cleaning cycle, predict membrane performance, and replace it in a timely manner. At the same time, it intelligently adjusts water production time to reduce energy consumption based on water demand and peak and off-peak electricity prices. This invention realizes the intelligent management of membrane water treatment systems, significantly improving operational efficiency and reducing operating costs.

[0019] 2. The intelligent operation system of the membrane water treatment equipment of this application has established a mathematical model, which can automatically perform data analysis, analyze the internal connections of the data, accurately control the dosage of related agents, save energy and reduce consumption, thereby achieving the safety and economy of water production in power plants.

[0020] 3. The intelligent operation systems for the ultrafiltration membrane system, reverse osmosis membrane system, and EDI membrane system independently and automatically start and stop, enabling one-touch start and stop for the entire membrane system. The ultrafiltration membrane system intelligent operation system adjusts the ultrafiltration operation sequence based on historical trends in the inlet and outlet water pressure differential and turbidity values, performs timely chemical cleaning and maintenance, guides the orderly operation of multiple rows of ultrafiltration membranes, and extends the operation cycle of the ultrafiltration membranes. The reverse osmosis membrane system intelligent operation system adjusts the reverse osmosis operation sequence based on historical trends in the pressure differential between reverse osmosis membrane stages and produced water conductivity, performs timely chemical cleaning and maintenance, guides the orderly operation of multiple rows of reverse osmosis membranes, and extends the operation cycle of the reverse osmosis membranes. Intelligent dynamic analysis enables preventive maintenance and timely replacement of membranes with low flux or damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of the composition structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] See Figure 1 As shown, the present application illustrates a full-membrane water treatment operation system for process industries, comprising a raw water pump, a self-cleaning filter, an ultrafiltration device, an ultrafiltration water tank, an ultrafiltration water pump, a safety filter, a primary water supply pump, a primary reverse osmosis device, a water pump, a safety filter, a secondary water supply pump, a secondary reverse osmosis device, a freshwater tank, an EDI water supply pump, a safety filter, and an EDI device, all connected in sequence via pipelines. The system comprises an intelligent operation system for an ultrafiltration membrane system, an intelligent operation system for a reverse osmosis membrane system, an intelligent operation system for an EDI membrane system, and auxiliary equipment for dosing and cleaning. The monitoring system not only collects and stores production operation data in real time, intuitively displays the operating status of the membrane treatment equipment, and issues timely alarms, but also automatically generates operation reports. Compared to existing technologies, the present application automatically diagnoses membrane water treatment system equipment, achieves precise dosing control, and optimizes energy-saving operation, thereby achieving safety and economy in the production of industrial water throughout the entire process.

[0024] In this embodiment, a process industry full membrane water treatment operation system includes an ultrafiltration membrane system intelligent operation system, a reverse osmosis membrane system intelligent operation system, an EDI membrane system intelligent operation system and a control system.

[0025] In this embodiment, the intelligent operation system of the ultrafiltration membrane system includes a raw water pump, a self-cleaning filter, an ultrafiltration device, an ultrafiltration water tank, an ultrafiltration water pump and a safety filter connected in sequence through pipelines. The inlet and outlet of the intelligent operation system of the ultrafiltration membrane system are installed with pressure sensors for real-time detection of the inlet and outlet pressures. The intelligent operation system of the ultrafiltration membrane system is also provided with a differential pressure sensor for measuring the inlet and outlet pressure difference; a turbidity meter is installed on the water production pipeline of the intelligent operation system of the ultrafiltration membrane system for real-time detection of the turbidity of the produced water; a residual chlorine sensor and a temperature sensor are installed on the water inlet pipeline of the intelligent operation system of the ultrafiltration membrane system; the differential pressure sensor and the turbidity meter are both connected to the control system.

[0026] Specifically, the intelligent operation system of the ultrafiltration membrane system automatically adjusts the dosage of the bactericide before ultrafiltration according to the residual chlorine content of the system inlet water; sets the temperature range of the ultrafiltration inlet water and automatically adjusts the opening of the regulating valve of the heater; controls the raw water pump by frequency conversion, increases the pressure and flow slowly at a low frequency, and ensures that the pressure and flow at the inlet of the intelligent operation system of the ultrafiltration membrane system are within the allowable range of the ultrafiltration membrane.

[0027] Specifically, the ultrafiltration device includes multiple rows of ultrafiltration membranes. The important parameters for the operation of the ultrafiltration membranes include the inlet and outlet water pressure difference and the turbidity of the produced water. The control system adjusts the ultrafiltration operation sequence according to the historical trends of the inlet and outlet water pressure difference and turbidity values ​​of the ultrafiltration membrane system, performs chemical cleaning and maintenance in a timely manner, guides the orderly operation of the multiple rows of ultrafiltration membranes, and extends the operation cycle of the ultrafiltration membranes. At the same time, the control system summarizes and analyzes the historical trends of the inlet and outlet water pressure difference and turbidity values, routine maintenance and chemical cleaning records, and generates an ultrafiltration membrane diagnostic report to guide users to replace the quantity and time of ultrafiltration membranes.

[0028] Specifically, the water inlet pipe of the ultrafiltration membrane system intelligent operation system is also equipped with a dosing pump and a heater. The residual chlorine sensor is linked to the dosing pump through the control system. The dosing pump is connected to the control system. The dosage of the disinfectant is automatically adjusted according to the residual chlorine content of the inlet water detected by the residual chlorine sensor; the temperature sensor is linked to the regulating valve of the heater through the control system. The regulating valve of the heater is connected to the control system. The opening of the regulating valve of the heater is automatically adjusted according to the inlet water temperature detected by the temperature sensor.

[0029] Specifically, the database of the ultrafiltration membrane system intelligent operation system summarizes membrane fouling faults, finds out the essence of the problem through the fault, and implements repair and maintenance measures as soon as possible. See Table 1 for details.

[0030] Table 1 Fault phenomena and cause analysis and countermeasures of the ultrafiltration membrane system intelligent operation system

[0031]

[0032] In this embodiment, the intelligent operation system of the reverse osmosis membrane system includes a first-level water supply pump, a first-level reverse osmosis device, a water pump, a safety filter, a second-level water supply pump, a second-level reverse osmosis device and a fresh water tank connected in sequence by pipelines. The first-level water supply pump is connected to the water production pipeline of the first-level reverse osmosis device, and the inlet of the first-level reverse osmosis device is connected to the water production pipeline of the ultrafiltration membrane system intelligent operation system. Multi-stage reverse osmosis components are provided in the first-level reverse osmosis device and the second-level reverse osmosis device. The inlet and concentrated water outlet of each level of reverse osmosis membrane assembly are installed with pressure sensors for measuring the trans-membrane pressure difference of each level; pressure switches are installed at the inlet and outlet of the first-level fresh water pump for monitoring the operating pressure and realizing the protection function; flow meters are provided on the water inlet pipeline and water production pipeline of the intelligent operation system of the reverse osmosis membrane system for measuring the water inlet flow and water production flow, respectively; a conductivity meter is also provided on the water production pipeline of the intelligent operation system of the reverse osmosis membrane system for real-time detection of the conductivity of the produced water; the pressure sensor, pressure switch, flow meter and conductivity meter are all connected to the control system.

[0033] Specifically, the intelligent operation system of the reverse osmosis membrane system establishes data curves of inlet water temperature, inlet water pressure, water production, and high-pressure pump power consumption. Through comparative analysis and the use of self-learning methods, it seeks to find the appropriate inlet water temperature and pressure values ​​through comparison to control the inlet water volume and high-pressure pump frequency; it establishes data curves of inlet water pH value, ORP value, water production conductivity value, and free carbon dioxide value. Through comparative analysis and the use of self-learning methods, it seeks to find the appropriate inlet water pH value through comparison to control the dosage.

[0034] Specifically, the inlet residual chlorine value and ORP value of the reverse osmosis membrane system intelligent operation system are used to control the amount of reducing agent added. The residual chlorine value is controlled within 0.0PPM, and the corresponding ORP value is controlled within 150-200MV.

[0035] Specifically, the important parameters of the intelligent operation system of the reverse osmosis membrane system include trans-membrane pressure difference at each level, water inlet flowmeter, water production flowmeter, and water production conductivity. All detection and analysis instruments are connected to the control system by telecommunication. The control system generates a reverse osmosis membrane diagnostic report based on the historical trends of the trans-membrane pressure difference values ​​and water production conductivity values ​​at each level, routine maintenance and chemical cleaning records, and summarizes and analyzes them to guide users on the number and time of replacing reverse osmosis membranes. Both the first-level water supply pump and the second-level water supply pump adopt variable frequency control, which can not only start at low frequency, but also reach the maximum frequency within a limited time, and reduce the impact on the reverse osmosis membrane when the water supply pump is started, thereby extending the service life of the reverse osmosis membrane and reducing the maintenance cost of the equipment. At the same time, when the reverse osmosis water production reaches the rated water output, the frequency of the water supply pump is adjusted to appropriately reduce the water inlet pressure and recovery rate. It is also necessary to take into account that the pressure on the water production side is lower than the water inlet pressure, which is beneficial to the long-term operation of the reverse osmosis membrane.

[0036] Specifically, the database of the intelligent operation system of the reverse osmosis membrane system summarizes membrane fouling faults, finds out the essence of the problem through the fault, and implements repair and maintenance measures as soon as possible. See Table 2 for details.

[0037] Table 2 Fault phenomena and cause analysis and countermeasures of the intelligent operation system of the reverse osmosis membrane system

[0038]

[0039] In this embodiment, the EDI membrane system intelligent operation system includes an EDI water supply pump, a safety filter and an EDI device connected in sequence through pipelines. The inlet of the EDI water supply pump is connected to the water production pipeline of the reverse osmosis membrane system intelligent operation system. A water inlet flow meter is installed on the water inlet pipeline of the EDI membrane system intelligent operation system, and a water production flow meter, a conductivity meter and a SiO2 analyzer are provided on the water production pipeline; the conductivity meter, SiO2 analyzer and flow meter are all connected to the control system.

[0040] Specifically, the EDI device is provided with a concentrated water flow switch at the concentrated water outlet, a water supply flow sensor is provided on the water inlet pipe of the EDI device, and a water production flow sensor is provided on the water production pipe. The concentrated water flow switch is hard-wired to cut off the local EDI DC power supply. The water supply flow sensor and the water production flow sensor are both telecommunication-connected to the control system, which issues an instruction to cut off the EDI DC power supply through the logical operation inside the control system.

[0041] Specifically, the water production pipeline of the EDI membrane system intelligent operation system is also connected to the desalted water tank. A desalted water pump is provided on the outlet pipe of the desalted water tank. The desalted water pump introduces the outlet water of the desalted water tank into the factory thermal system for utilization.

[0042] Specifically, the EDI membrane system intelligent operation system adopts variable frequency control to the EDI feed water pump according to the inlet flow meter, production water flow meter, concentrate flow, production water conductivity, and production water SiO2, adjusts the EDI inlet water pressure and controls the EDI inlet water flow, so that the EDI production water flow and concentrate flow are within the specified range.

[0043] Specifically, both the ultrafiltration membrane system intelligent operation system and the EDI membrane system intelligent operation system feature cleaning systems, each equipped with a chained water supply program to ensure that at least one set of equipment is operating normally during cleaning. The cleaning system's control program initiates a flushing pump call before each step that uses the cleaning pump. This command enters a command queue, and the cleaning pump calls the command based on a first-in, first-out logic. While one set of equipment is using the flushing pump, the remaining equipment waits or operates normally.

[0044] Specifically, the pH of the inlet water of the EDI membrane system intelligent operation system directly affects its produced water resistance and silicate removal. By adjusting the pH of the produced water of the first-stage reverse osmosis, the pH of the inlet water of the EDI membrane system intelligent operation system can be controlled between 7-8.

[0045] Specifically, the control system includes a PLC controller and a human-machine interface. After receiving the signal, the PLC controller performs logical judgment and control according to the preset program and parameters. The human-machine interface is used for operators to set parameters, view real-time data and system operation status.

[0046] In this embodiment, the workflow of a full-membrane water treatment system for process industries is as follows: raw water first enters the system, then passes through a self-cleaning filter to remove larger particles and impurities. The initially filtered water enters an ultrafiltration unit to further remove smaller particles and suspended solids. The ultrafiltered water then flows into an ultrafiltration tank. The water in the ultrafiltration tank passes through a safety filter before entering a primary reverse osmosis system. Reverse osmosis is a membrane separation technology used to remove dissolved salts, organic matter, and other impurities from water. The water from the primary reverse osmosis system flows into a freshwater tank. After passing through a safety filter again, the water enters a secondary reverse osmosis system to further remove residual impurities and improve water purity. The water from the secondary reverse osmosis system then enters an EDI unit. EDI uses an electric field to remove ions from water, further reducing its conductivity and producing high-purity water. The entire process uses multiple safety filters to ensure stable and safe water quality and prevent contamination of the membrane system. This full-membrane water treatment process is widely used in industrial water, electronics, pharmaceuticals, and other fields to ensure water quality meets stringent standards.

[0047] Example 1

[0048] 1. Ultrafiltration membrane system intelligent operation system

[0049] Excessively high water temperature will destroy the chemical structure of the membrane and change its performance; excessively high inlet water pressure will also damage the membrane. The reason for high inlet water turbidity is high COD content. Insufficient sterilization strength leads to excessive COD. The intelligent operation system of the ultrafiltration membrane system detects the temperature, turbidity and residual chlorine of the incoming water to ensure that the incoming water is qualified. The reason for high inlet water turbidity is high COD content. The dosage of the bactericide before ultrafiltration is automatically adjusted according to the residual chlorine content of the ultrafiltration inlet water; the temperature range of the ultrafiltration inlet water is set, and the opening of the regulating valve of the heater is automatically adjusted; the raw water pump of the ultrafiltration device is controlled by variable frequency, and the pressure and flow are increased slowly at a low frequency to ensure that the pressure and flow at the inlet of the ultrafiltration device are within the allowable range of the ultrafiltration membrane.

[0050] Important parameters for ultrafiltration membrane operation include the inlet and outlet water pressure differential and the turbidity of the produced water. The ultrafiltration membrane system's intelligent operation system detects inlet and outlet pressures and differential pressure values ​​to ensure that the operating pressure of the ultrafiltration device does not exceed the standard. A differential pressure value lower than the specified value or higher than the specified value may affect the long-term operation of the membrane. Based on the historical trends of the inlet and outlet water pressure differential and turbidity values ​​of the ultrafiltration membrane system, the operating steps of the ultrafiltration membrane system's intelligent operation system are adjusted, and chemical cleaning and maintenance are carried out in a timely manner to guide the orderly operation of multiple rows of ultrafiltration membranes and extend the operating cycle of the ultrafiltration membranes. Based on the historical trends of the inlet and outlet water pressure differential and turbidity values, routine maintenance and chemical cleaning records are summarized and analyzed to generate an ultrafiltration membrane diagnostic report to guide users in the number and timing of ultrafiltration membrane replacements.

[0051] The ultrafiltration membrane system's intelligent operation system adjusts the ultrafiltration operation sequence based on historical trends in the inlet and outlet water pressure differential and turbidity values, performs timely chemical cleaning and maintenance, guides the orderly operation of multiple ultrafiltration membrane trains, and extends the ultrafiltration membrane's operating cycle. Ultrafiltration membrane fouling is categorized into three types: organic, inorganic, and microbial. Organic fouling primarily manifests as a fouling layer on the membrane surface or clogging of membrane pores. Hydrophilic organic matter causes a decrease in flux (reduced water production). Inorganic particles accumulate on the membrane surface or within the pores, creating a gradually increasing resistance (increasing transmembrane pressure differential). Bacteria can adhere to the membrane surface to form biofilms, which are biologically active and affect hydraulic permeability (reducing water production while increasing transmembrane pressure differential). As temperature rises, microbial reproduction accelerates, resulting in a short-term upward trend. The ultrafiltration membrane intelligent operation system can dynamically adjust operating strategies (increasing ultrafiltration backwash time and ultrafiltration chemical cleaning time).

[0052] When the UF system is deactivated, chemical cleaning is the first consideration. Systems with multiple UF units require decentralized cleaning, with the UF units flushing using water from the UF tank. When decentralized cleaning is performed on multiple (three or more) UF units, one UF unit must be in interlocked water production mode to maintain the UF tank level. For example, with four UF units, during the decentralized cleaning process, all three units (four in total, one in interlocked water production mode) share the backwash pump (while one unit is using the backwash pump, the remaining units are not permitted to operate). The five backwash steps take approximately 15 minutes. After backwashing and dosing, the UF units enter a chemical soak phase, which lasts approximately one hour. For maximum cleaning efficiency, one UF unit should be immersed in the clean water phase, while the other units alternately utilize the backwash pumps. The backwash pump queuing logic in this program is designed as follows: a backwash pump call is initiated before each step that may require it. The call is then queued and called using a first-in, first-out logic. While one ultrafiltration unit is using the backwash pump, the others are waiting. To maintain the ultrafiltration membrane during downtime, scheduled chemical cleaning and ultrafiltration backwashing can extend the membrane's operating cycle.

[0053] 2. Reverse Osmosis Membrane System Intelligent Operation System

[0054] Important parameters for reverse osmosis membrane operation: transmembrane pressure difference at each level, inlet flow meter, product water flow meter, and product water conductivity.

[0055] The intelligent operation system of the reverse osmosis membrane system generates a reverse osmosis membrane diagnostic report based on the historical trends of the trans-membrane pressure difference values ​​and the conductivity values ​​of the produced water at each level, as well as the routine maintenance and chemical cleaning records, to guide users on the quantity and timing of replacing reverse osmosis membranes.

[0056] The first-stage water supply pump and the second-stage water supply pump adopt variable frequency control, which can not only start at low frequency but also reach the maximum frequency within a limited time. It can also reduce the impact on the reverse osmosis membrane when the water supply pump starts, extend the service life of the reverse osmosis membrane, and reduce the maintenance cost of the equipment.

[0057] When reverse osmosis water production reaches rated output, adjusting the feed pump frequency can appropriately reduce inlet pressure and recovery rate. It's also important to ensure that the pressure on the product side is lower than the inlet pressure to facilitate long-term reverse osmosis membrane operation. Excessively high inlet flow can cause bulges at the outlet end of the membrane element and deformation of the water barrier. Too low a brine flow rate can easily lead to severe concentration polarization, exacerbating membrane element fouling. The high-pressure pump inverter automatically controls the inlet flow rate, and the brine regulating valve automatically adjusts the brine flow rate.

[0058] The main indicators of the reverse osmosis membrane system intelligent operation system are: desalination rate, water production, and recovery rate.

[0059] Reverse osmosis membranes inevitably become contaminated by colloidal fouling, biological fouling, or chemical scaling, leading to decreased salt rejection and water production. A control system that stabilizes operating pressure and regularly calculates recovery rates ensures reverse osmosis operating indicators are within design specifications, preventing concentrated salt from exceeding the concentration product. The inlet pH value of the reverse osmosis membrane system intelligent operation affects salt rejection, with a typical control range of 7.5-8.5. The inlet water pressure and temperature of the reverse osmosis membrane system intelligent operation also affect water production. Increasing temperature and pressure increases steam and electricity consumption, leading to increased costs. Increasing inlet water temperature increases water production but reduces salt rejection; increasing inlet pressure increases water production and salt rejection. The residual chlorine and ORP values ​​at the reverse osmosis inlet are used to control the amount of reducing agent added. Residual chlorine should be controlled within 0.0 PPM, corresponding to an ORP of 150-200 MV.

[0060] When the reverse osmosis membrane system intelligent operation system is shut down, the first thing to consider is flushing the reverse osmosis membrane, using the water in the reverse osmosis water tank for flushing. When flushing multiple sets (more than 3 sets) of reverse osmosis membrane system intelligent operation systems, one set of reverse osmosis membrane system intelligent operation systems needs to enter the interlocking water production state to maintain the liquid level of the reverse osmosis water tank.

[0061] Taking four reverse osmosis membrane system intelligent operation systems as an example, during the flushing process, three reverse osmosis membrane system intelligent operation systems (a total of four reverse osmosis membrane system intelligent operation systems, one of which is in interlocked water production) share the flushing water pump for flushing. (While one reverse osmosis membrane system intelligent operation system is using the flushing water pump, the other reverse osmosis membrane system intelligent operation systems are not allowed to use it.) The flushing pump queuing logic of this program is designed as follows: before each step that may use the flushing water pump, a flushing water pump call instruction is issued. The instruction enters the instruction queue and is called according to the first-in, first-out logic. While one reverse osmosis system is using the flushing water pump, the other reverse osmosis systems wait.

[0062] The reverse osmosis membrane system's intelligent operation system establishes data curves for inlet water temperature, inlet water pressure, water production, and high-pressure pump power consumption. Through comparative analysis and self-learning, it finds the appropriate inlet water temperature and pressure values ​​to control the inlet water volume and high-pressure pump frequency. It also establishes data curves for inlet water pH, ORP value, water production conductivity, and free carbon dioxide value. Through comparative analysis and self-learning, it finds the appropriate inlet water pH value to control the dosage.

[0063] Three EDI membrane system intelligent operation system

[0064] Important parameters of EDI device: inlet water flow meter, product water flow meter, concentrated water flow rate, product water conductivity, and product water SiO2.

[0065] The pH value of the inlet water of the EDI membrane system intelligent operation system directly affects the resistance value of the produced water and the removal of silicates. By adjusting the pH value of the produced water of the first-stage reverse osmosis, the pH value of the EDI inlet water can be controlled between 7-8.

[0066] The EDI unit features a control and protection system for safe and stable operation. This system utilizes a brine flow switch hard-interlocked with a local control panel, and dual safeguards, including feedwater and product water flow sensors and DCS logic control. A brine flow switch is installed at the brine outlet. When brine flow is cut off, a light-flow meter transmits a cutoff signal to the local control panel. The cutoff relay amplifies this signal and transmits it to the central control room DCS and the start / stop relays of each EDI module's rectifier power supply module, shutting down the rectifier power supply module. The local control panel also receives start / stop signals from the central control room DSC for the rectifier power supply module. These signals are then generated by the DCS logic, which monitors the feedwater and product water flow rates of the EDI unit in real time. If either the feedwater or product water signal exceeds the set range, the DCS remotely shuts down the EDI unit.

[0067] The EDI power module displays the DC voltage and current operating status on the power cabinet. This information is uploaded to the DCS or central control room for monitoring via the built-in RS485 communication interface. The central control room or DCS can also independently adjust the operating DC voltage and current via RS485 communication signals, enabling remote monitoring and control. Each module's current (2-4A) is adjusted based on the influent quality, with the voltage below 300V. If the full-membrane system has been operating for more than one year or if the raw water quality changes, the EDI power module current can be adjusted on the DCS operation screen.

[0068] The EDI water feed pump adopts frequency conversion control to adjust the EDI water inlet pressure and control the EDI water inlet flow. The EDI water production flow and concentrated water (ultra-water) flow are within the specified range.

[0069] Strictly control the operating pressure and pressure drop of the EDI membrane system intelligent operation system, which must be higher than a certain pressure of the concentrated water to prevent the concentrated water from leaking into the product water.

[0070] The main indicators of the EDI membrane system intelligent operation system are: water production and recovery rate.

[0071] For product water with low conductivity and low silica content, comprehensive considerations include: product water flow rate should be at the lower limit of the given range; EDI current should be moderate; concentrate flow rate should be at the upper limit of the given range; and inlet water pH should be adjusted close to the upper limit.

[0072] In summary, the technical solution of this application has the following beneficial effects:

[0073] 1. The full-membrane water treatment operation system of this application collects real-time operating data from the ultrafiltration membrane system intelligent operation system, the reverse osmosis membrane system intelligent operation system, and the EDI membrane system intelligent operation system to construct a fault diagnosis model and achieve intelligent monitoring and early warning. The system can accurately control the addition of reagents, optimize the cleaning cycle, predict membrane performance, and replace it in a timely manner. At the same time, it intelligently adjusts water production time to reduce energy consumption based on water demand and peak and off-peak electricity prices. This invention realizes the intelligent management of membrane water treatment systems, significantly improving operational efficiency and reducing operating costs.

[0074] 2. The intelligent operation system of the membrane water treatment equipment of this application has established a mathematical model, which can automatically perform data analysis, analyze the internal connections of the data, accurately control the dosage of related agents, save energy and reduce consumption, thereby achieving the safety and economy of water production in power plants.

[0075] 3. The intelligent operation systems for the ultrafiltration membrane system, reverse osmosis membrane system, and EDI membrane system independently and automatically start and stop, enabling one-touch start and stop for the entire membrane system. The ultrafiltration membrane system intelligent operation system adjusts the ultrafiltration operation sequence based on historical trends in the inlet and outlet water pressure differential and turbidity values, performs timely chemical cleaning and maintenance, guides the orderly operation of multiple rows of ultrafiltration membranes, and extends the operation cycle of the ultrafiltration membranes. The reverse osmosis membrane system intelligent operation system adjusts the reverse osmosis operation sequence based on historical trends in the pressure differential between reverse osmosis membrane stages and product water conductivity, performs timely chemical cleaning and maintenance, guides the orderly operation of multiple rows of reverse osmosis membranes, and extends the operation cycle of the reverse osmosis membranes. Intelligent dynamic analysis enables preventive maintenance and timely replacement of low-flux or damaged membranes.

[0076] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A full membrane water treatment operation system for process industry, characterized in that: Including ultrafiltration membrane system intelligent operation system, reverse osmosis membrane system intelligent operation system, EDI membrane system intelligent operation system and control system, The ultrafiltration membrane system intelligent operation system includes a raw water pump, a self-cleaning filter, an ultrafiltration device, an ultrafiltration water tank, an ultrafiltration water pump and a security filter connected in sequence through pipelines. The inlet and outlet of the ultrafiltration membrane system intelligent operation system are both installed with pressure sensors for real-time detection of inlet and outlet pressures. The ultrafiltration membrane system intelligent operation system is also provided with a differential pressure sensor for measuring the inlet and outlet pressure difference; a turbidity meter is installed on the water production pipeline of the ultrafiltration membrane system intelligent operation system for real-time detection of the turbidity of the produced water; a residual chlorine sensor and a temperature sensor are installed on the water inlet pipeline of the ultrafiltration membrane system intelligent operation system; the differential pressure sensor and the turbidity meter are both connected to the control system; The reverse osmosis membrane system intelligent operation system includes a primary water supply pump, a primary reverse osmosis device, a water pump, a safety filter, a secondary water supply pump, a secondary reverse osmosis device and a fresh water tank connected in sequence through pipelines, the primary water supply pump is connected to the water production pipeline of the ultrafiltration membrane system intelligent operation system, the inlet of the primary reverse osmosis device is connected to the outlet of the primary water supply pump, the primary reverse osmosis device and the secondary reverse osmosis device are both provided with multi-stage reverse osmosis components, the inlet and concentrated water outlet of the reverse osmosis membrane components at each stage are installed with pressure sensors for measuring the trans-membrane pressure difference at each stage; the inlet and outlet of the primary fresh water pump are installed with pressure switches for monitoring the operating pressure and realizing the protection function; the water inlet pipeline and the water production pipeline of the reverse osmosis membrane system intelligent operation system are both provided with flow meters for measuring the water inlet flow and the water production flow respectively; the water production pipeline of the reverse osmosis membrane system intelligent operation system is also provided with a conductivity meter for real-time detection of the conductivity of the produced water; the pressure sensor, pressure switch, flow meter and conductivity meter are all connected to the control system; The EDI membrane system intelligent operation system includes an EDI water supply pump, a security filter and an EDI device connected in sequence through pipelines. The inlet of the EDI water supply pump is connected to the water production pipeline of the reverse osmosis membrane system intelligent operation system. The water supply pipeline of the EDI membrane system intelligent operation system is equipped with a water supply flow meter, and the water production pipeline is equipped with a water production flow meter, a conductivity meter and a SiO2 analyzer; the conductivity meter, SiO2 analyzer and flow meter are all connected to the control system; The water inlet pipe of the ultrafiltration membrane system intelligent operation system is also equipped with a dosing pump and a heater. The control system automatically adjusts the amount of fungicide added by the dosing pump according to the residual chlorine content of the inlet water detected by the residual chlorine sensor; the control system automatically adjusts the opening of the regulating valve of the heater according to the inlet water temperature detected by the temperature sensor; Among them, the ultrafiltration membrane system intelligent operation system and the EDI membrane system intelligent operation system are both equipped with a cleaning system, and the cleaning system is provided with a chain input water production program to ensure that at least one set of equipment operates normally during cleaning.

2. A process industry full membrane water treatment operation system according to claim 1, characterized in that: The water production pipeline of the EDI membrane system intelligent operation system is also connected to the desalted water tank. A desalted water pump is provided on the outlet pipe of the desalted water tank. The desalted water pump introduces the outlet water of the desalted water tank into the factory thermal system for utilization.

3. A process industry full membrane water treatment operation system according to claim 1, characterized in that: The control system includes a DCS controller and a human-machine interface. After receiving signals, the DCS controller performs logical judgment and control according to preset programs and parameters. The human-machine interface is used by operators to set parameters, view real-time data and system operating status.

4. A process industry full membrane water treatment operation system according to claim 1, characterized in that: The intelligent operation system of the ultrafiltration membrane system automatically adjusts the dosage of the bactericide before ultrafiltration according to the residual chlorine content of the system inlet water; sets the temperature range of the ultrafiltration inlet water and automatically adjusts the opening of the regulating valve of the heater; and frequency-controls the raw water pump to increase the pressure and flow at a low frequency and slowly to ensure that the pressure and flow at the inlet of the intelligent operation system of the ultrafiltration membrane system are within the allowable range of the ultrafiltration membrane.

5. A process industry full membrane water treatment operation system according to claim 1, characterized in that: The control program of the cleaning system is: before each step using the flushing water pump, a flushing water pump call instruction is initiated, the instruction enters the instruction queue, and the flushing water pump calls the instruction according to the first-in-first-out logic. When one set of equipment to be cleaned uses the flushing water pump, the other equipment waits or operates normally.

6. A process industry full membrane water treatment operation system according to claim 1, characterized in that: The reverse osmosis membrane system intelligent operation system establishes data curves of inlet water temperature, inlet water pressure, water production, and high-pressure pump power consumption, and through comparative analysis and a self-learning method, seeks to find suitable inlet water temperature and pressure values ​​through comparison to control the inlet water volume and high-pressure pump frequency; establishes data curves of inlet water pH value, ORP value, water production conductivity value, and free carbon dioxide value, and through comparative analysis and a self-learning method, seeks to find suitable inlet water pH value through comparison to control the dosage.

7. A process industry full membrane water treatment operation system according to claim 1, characterized in that: The EDI membrane system intelligent operation system adopts variable frequency control to the EDI water feed pump according to the water inlet flowmeter, water production flowmeter, concentrated water flow, water production conductivity, and water production SiO2, adjusts the EDI water inlet pressure and controls the EDI water inlet flow, and the EDI water production flow and concentrated water flow are within the specified range.

8. The process industry full membrane water treatment operation system according to claim 1, characterized in that: The EDI device is provided with a concentrated water flow switch at the concentrated water outlet, a water supply flow sensor is provided on the water inlet pipe of the EDI device, and a water production flow sensor is provided on the water production pipe. The concentrated water flow switch is hard-wired to cut off the local EDI DC power supply, and the water supply flow sensor and the water production flow sensor are both telecommunication-connected to the control system. Through the logic operation inside the control system, an instruction is issued to cut off the EDI DC power supply.

9. A process industry full membrane water treatment operation system according to claim 1, characterized in that: The inlet residual chlorine value and ORP value of the reverse osmosis membrane system intelligent operation system are used to control the amount of reducing agent added. The residual chlorine value is controlled within 0.0PPM, and the corresponding ORP value is controlled within 150-200MV.

10. A process industry full membrane water treatment operation system according to claim 1, characterized in that: The pH of the inlet water of the EDI membrane system intelligent operation system is between 7 and 8.

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