Ion purification device and method of use thereof

Abstract

This invention belongs to the field of indirect cooling system circulating water treatment technology, and relates to an ion purification device and its usage method. The device includes a pressurized chamber assembly comprising a pre-desalination treatment chamber and a deep polishing treatment chamber; a two-stage deep anion removal core module, including a first-stage anion electrodialysis pre-desalination unit and a second-stage polishing-type electro-deionization treatment unit, which are respectively installed inside their respective chambers and connected in series; a multi-parameter water quality sensing module, including three sets of sensors respectively located at the inlet and outlet of the first-stage unit and the outlet of the second-stage unit; and a central industrial control module, whose signal input terminal is connected to each sensor set, and whose control signal output terminal is electrically connected to the two-stage treatment units. This invention effectively avoids pipe corrosion problems caused by excessive corrosive anions and the risk of corrosion due to increased pH fluctuations, improving the safety, stability, and economy of indirect cooling circulating water system operation.

Description

Technical Field

[0001] This invention belongs to the field of circulating water treatment technology for intercooled systems, and relates to an ion purification device and its usage method. Background Technology

[0002] SCAL-type indirect air-cooled units are widely used in coal-rich but water-scarce regions due to their significant water-saving advantages. These systems typically use approximately 10,000 tons of demineralized water as the circulating cooling medium. Because the demineralized water itself has extremely weak buffering capacity, and the system's conventional configuration lacks targeted deep purification devices, key indicators such as pH, conductivity, anion concentration, and iron content of the circulating water are prone to abnormal fluctuations. Among these, corrosive anions such as chloride and sulfate ions are the core factors threatening the safe operation of the system: even if the conductivity of the circulating water is controlled below 2 μS / cm, trace amounts of corrosive anions can still penetrate the passivation film on the surface of carbon steel or stainless steel heat exchange tubes, inducing pitting corrosion, crevice corrosion, and even stress corrosion cracking. Under the frequent load changes of peak-shaving units, accelerated corrosion due to flow and temperature fluctuations further enhance the corrosive effect of anions, leading to thinning of the tube walls, perforation, and leakage, ultimately causing unplanned shutdowns and significant economic losses. For high-parameter ultra-supercritical units, in order to completely eliminate the risk of corrosion, in practice, it is required that the concentration of chloride ions in the circulating water be kept below 100 μg / L and the concentration of sulfate ions be kept below 50 μg / L, while the pH value be maintained in the suitable corrosion-inhibiting range of 7.0 to 8.3.

[0003] Chinese patent CN111977758A discloses an intelligent purification system for circulating water in an indirect air-cooled system and its usage method. It can control parameters such as pH, conductivity and turbidity within the target range. However, its actual operation has obvious defects: the system cannot stably achieve deep removal of corrosive anions at the μg / L level, making it difficult to meet the stringent water quality requirements of ultra-supercritical units; moreover, the operating cost of continuous operation of the mixed bed is high. If corrosion inhibitors are added to the circulating water, the mixed bed will simultaneously adsorb the corrosion inhibitors, causing them to become ineffective, further increasing the treatment burden.

[0004] Existing water treatment technologies for removing corrosive anions are ill-suited to the specific scenarios of bypass treatment of intercooled circulating water. Conventional chemical corrosion inhibitor processes can only delay corrosion through film formation, but cannot eliminate corrosive anions at the source. When the chloride ion concentration exceeds 100 μg / L, the corrosion inhibitor film is easily broken down, failing to meet the requirements for ultra-low corrosion risk. Furthermore, the agents themselves introduce additional impurity ions, exacerbating anion accumulation, and resulting in high operating costs and a heavy burden of wastewater treatment. Conventional anion exchange resin processes cannot consistently achieve deep removal at the μg / L level. After resin saturation, frequent regeneration with large amounts of high-purity sodium hydroxide is required, generating large quantities of high-concentration alkaline wastewater with high disposal costs. Moreover, the resin is susceptible to contamination by trace organic matter and microorganisms, leading to a significant decrease in exchange capacity after regeneration, making it difficult to achieve long-term stable compliance. While reverse osmosis or nanofiltration membrane processes offer some removal capabilities, they cannot stably control chloride ions below 100 μg / L. Furthermore, membrane modules are sensitive to feed water quality, easily fouled by suspended solids, colloids, and microorganisms, requiring frequent chemical cleaning. Membrane lifespan is typically less than two years, resulting in high replacement costs. Additionally, the system suffers from low recovery rates, large concentrate discharge volumes, and high energy consumption, making it completely unsuitable for the side-flow treatment of high-flow-rate intercooled circulating water. Conventional electrodialysis or bipolar membrane electrolysis processes can only achieve anion removal at the mg / L level. Constrained by membrane concentration diffusion, water permeation, and electrode side reactions, they cannot consistently achieve ultra-trace control requirements at the μg / L level. Moreover, the electrolysis process easily leads to significant pH fluctuations, potentially exacerbating corrosion, thus failing to meet the stringent requirements of this scenario. Summary of the Invention

[0005] To address the problems in the prior art, this invention provides an ion purification device and its usage method, which effectively avoids pipeline corrosion problems caused by excessive corrosive anions and the risk of corrosion due to increased pH fluctuations, thereby improving the safety, stability, and economy of the intercooled circulating water system.

[0006] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides an ion purification device, comprising: A pressure-bearing cavity assembly, comprising a pre-desalination treated cavity and a deep polishing treated cavity; The two-stage deep anion removal core module includes a first-stage anion electrodialysis pre-desalination unit and a second-stage polishing-type electro-deionization treatment unit. The first-stage anion electrodialysis pre-desalination unit is installed inside the pre-desalination treatment chamber, and the second-stage polishing-type electro-deionization treatment unit is installed inside the deep polishing treatment chamber. The outlet of the first-stage anion electrodialysis pre-desalination unit is connected to the inlet of the second-stage polishing-type electro-deionization treatment unit. A multi-parameter water quality sensing module, comprising a first sensor group, a second sensor group, and a third sensor group; the first sensor group is installed at the inlet of the first-stage anion electrodialysis pre-desalination unit, the second sensor group is installed at the outlet of the first-stage anion electrodialysis pre-desalination unit, and the third sensor group is installed at the outlet of the second-stage polishing type electro-deionization treatment unit. The central industrial control module has its signal input terminals connected to the signal output terminals of the first sensor group, the second sensor group, and the third sensor group, respectively, and its control signal output terminals connected to the first-stage anion electrodialysis pre-desalination unit and the second-stage polishing-type electrodeionization treatment unit, respectively.

[0007] Preferably, the first-stage anion electrodialysis pre-desalination unit includes a DC electrolysis power supply, a pre-desalination compartment unit, and an inert electrode assembly; the pre-desalination compartment unit is disposed inside the pre-desalination treatment chamber, and the pre-desalination compartment unit is composed of multiple sets of homogeneous anion-selective exchange membranes and cation exchange membranes arranged alternately; the pre-desalination treatment chamber has electrode chambers at both ends inside, and the inert electrode assembly is disposed in the electrode chamber; the DC electrolysis power supply is disposed outside the pre-desalination treatment chamber, and the inert electrode assembly is electrically connected to the positive and negative electrodes of the DC electrolysis power supply, respectively.

[0008] Preferably, the inert electrode assembly is a titanium-based platinum-plated electrode.

[0009] Preferably, the second-stage polishing electro-deionization treatment unit includes a DC electrolysis power supply, an array-type deep polishing chamber unit, and a bipolar membrane assembly; the array-type deep polishing chamber unit is disposed inside the deep polishing treatment cavity, and the array-type deep polishing chamber unit is composed of multiple sets of alternating homogeneous anion selective exchange membranes and bipolar membranes, with ion exchange resin filling the spaces between adjacent homogeneous anion selective exchange membranes and bipolar membranes; the bipolar membrane assembly is disposed inside the deep polishing treatment cavity, and the DC electrolysis power supply is disposed outside the deep polishing treatment cavity, and the DC electrolysis power supply is electrically connected to the array-type deep polishing chamber unit and the bipolar membrane assembly respectively.

[0010] Preferably, the ion exchange resin is a gel-type anion exchange resin.

[0011] Preferably, the central industrial control module includes a main control chip, a programmable logic controller, a data processing unit, a control algorithm unit, a fault diagnosis and interlocking protection unit, and an industrial network communication unit; The main control chip is connected to the programmable logic controller (PLC); the data processing unit, the control algorithm unit, the fault diagnosis and interlocking protection unit, and the industrial network communication unit are respectively connected to the main control chip; the signal input terminal of the data processing unit is connected to the signal output terminal of the multi-parameter water quality sensing module; the signal output terminal of the control algorithm unit is electrically connected to the control signal input terminals of the first-stage anion electrodialysis pre-desalination unit and the second-stage polishing electro-deionization treatment unit; the signal input terminal of the fault diagnosis and interlocking protection unit is electrically connected to the control signal input terminals of the first-stage anion electrodialysis pre-desalination unit. The voltage detection terminal of the pressure detection unit, the voltage detection terminal of the second-stage polishing electro-deionization treatment unit, the differential pressure detection terminal of the pre-desalination treatment chamber, the differential pressure detection terminal of the deep polishing treatment chamber, and the signal output terminal of the multi-parameter water quality sensing module are connected; the signal output terminal of the fault diagnosis and interlocking protection unit is connected to the control signal input terminal of the first-stage anion electrodialysis pre-desalination unit, the control signal input terminal of the second-stage polishing electro-deionization treatment unit, and the control signal input terminal of the circulating water pipeline module, respectively; the industrial network communication unit is connected to the power plant's DCS system and SIS system through an industrial communication interface, respectively.

[0012] Preferably, the first sensor group, the second sensor group, and the third sensor group each include an ion chromatograph, a pH sensor, a conductivity sensor, a redox potential sensor, a temperature sensor, and a flow sensor; the signal output terminals of each sensor are connected to the data input terminal of the central industrial control module.

[0013] Preferably, it also includes a circulating water pipeline module, which includes a freshwater circulation unit and a concentrated water circulation unit; The freshwater circulation unit includes a booster centrifugal pump, a flow regulating valve, a check valve, and a manual maintenance valve. The outlet of the booster centrifugal pump is connected to the inlet of the flow regulating valve, and the outlet of the flow regulating valve is connected to the inlet of the pre-desalination treatment chamber. The check valve and the manual maintenance valve are installed sequentially between the booster centrifugal pump and the pre-desalination treatment chamber. The concentrate circulation unit includes a pre-desalination concentrate system and a deep treatment concentrate system. The pre-desalination concentrate system includes a first concentrate tank, a first concentrate circulation pump, a first drain valve, and a first make-up valve. The outlet of the first concentrate tank is connected to the inlet of the first concentrate circulation pump, the drain outlet of the first concentrate tank is connected to the inlet of the first drain valve, and the first make-up valve is installed between the make-up outlet of the first concentrate tank and the outlet of the pre-desalination treatment chamber. The outlet of the first concentrate circulation pump is connected to the concentrate inlet of the pre-desalination treatment chamber. The advanced treatment concentrate system includes a second concentrate tank, a second concentrate circulation pump, a second drain valve, and a second make-up valve. The outlet of the second concentrate tank is connected to the inlet of the second concentrate circulation pump, the drain outlet of the second concentrate tank is connected to the inlet of the second drain valve, the second make-up valve is installed between the make-up outlet of the second concentrate tank and the outlet of the advanced polishing chamber, the outlet of the second concentrate circulation pump is connected to the concentrate inlet of the advanced polishing chamber, and the concentrate outlet of the advanced polishing chamber is connected to the inlet of the pre-desalination chamber through a return pipeline.

[0014] Preferably, it also includes an automatic online cleaning and regeneration module for membrane modules, which includes an ultrasonic cleaning unit, an online cleaning unit, and a membrane fouling status assessment unit; The ultrasonic cleaning unit includes two ultrasonic transducers, which are respectively installed on the sidewalls of the pre-desalination treatment chamber and the deep polishing treatment chamber. The online cleaning unit is connected to both the pre-desalination treatment chamber and the deep polishing treatment chamber. The signal input terminal of the membrane fouling status assessment unit is connected to the voltage detection terminal of the first-stage anion electrodialysis pre-desalination unit, the voltage detection terminal of the second-stage polishing electrodeionization treatment unit, the differential pressure detection terminal of the pre-desalination treatment chamber, the differential pressure detection terminal of the deep polishing treatment chamber, and the signal output terminal of the multi-parameter water quality sensing module. The control signal output terminal of the membrane fouling status assessment unit is electrically connected to the control signal input terminal of the ultrasonic cleaning unit and the control signal input terminal of the online cleaning unit.

[0015] Secondly, the present invention provides a method of using an ion purification device, comprising the following steps: The circulating water flows sequentially through the pre-desalination treatment chamber and the deep polishing treatment chamber; The first sensor group collects the water quality parameters at the inlet of the pre-desalination treatment chamber, the second sensor group collects the water quality parameters at the outlet of the pre-desalination treatment chamber, and the third sensor group collects the water quality parameters at the outlet of the deep polishing treatment chamber. The central industrial control module receives the collected water quality parameters and controls the operation of the first-stage anion electrodialysis pre-desalination unit and the second-stage polishing electrodeionization treatment unit based on the water quality parameters.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By setting up pressurized chamber components, an independent and stable pressurized operating environment is provided for the two-stage treatment units. A first-stage anion electrodialysis pre-desalination unit is installed in the pre-desalination treatment chamber, and a second-stage polishing-type electro-deionization unit is installed in the deep polishing treatment chamber. These two units are connected in series to form a tiered treatment process. After the circulating water undergoes large-scale pre-desalination and deep polishing treatments, corrosive anions are efficiently removed at the source. Simultaneously, the bipolar membrane component in the second-stage unit synchronously adjusts the pH value during deep treatment, effectively avoiding the risk of corrosion exacerbated by pH fluctuations. A full-process water quality monitoring network is constructed by installing a first sensor group, a second sensor group, and a third sensor group at the inlet and outlet of the first-stage unit, and the outlet of the second-stage unit, respectively. A central industrial control module dynamically adjusts the operating status of the two-stage treatment units based on the water quality parameters collected by each sensor group, achieving precise closed-loop intelligent control. This significantly improves the safety, stability, and economy of the intercooled circulating water system without the need for chemical additives. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an ion purification device; Figure 2 This is a schematic diagram of a circulating water pipeline module.

[0019] The components include: 1. Pre-desalination treatment chamber; 2. Deep polishing treatment chamber; 3. First-stage anion electrodialysis pre-desalination unit; 4. Second-stage polishing type electro-deionization treatment unit; 5. First sensor group; 6. Second sensor group; 7. Third sensor group; 8. Central industrial control module; 9. Booster centrifugal pump; 10. Check valve; 11. Flow regulating valve; 12. Manual maintenance valve; 13. First concentrate tank; 14. First concentrate circulation pump; 15. First drain valve; 16. First water supply valve; 17. Second concentrate tank; 18. Second concentrate circulation pump; 19. Second drain valve; 20. Second water supply valve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply refers to its direction relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings: The first objective of this invention is to provide an ion purification device, such as... Figure 1 As shown, it includes: A pressure-bearing cavity assembly, the pressure-bearing cavity assembly comprising a pre-desalination treated cavity 1 and a deep polishing treated cavity 2; The two-stage deep anion removal core module includes a first-stage anion electrodialysis pre-desalination unit 3 and a second-stage polishing type electro-deionization treatment unit 4. The first-stage anion electrodialysis pre-desalination unit 3 is installed inside the pre-desalination treatment chamber 1, and the second-stage polishing type electro-deionization treatment unit 4 is installed inside the deep polishing treatment chamber 2. The outlet of the first-stage anion electrodialysis pre-desalination unit 3 is connected to the inlet of the second-stage polishing type electro-deionization treatment unit 4. A multi-parameter water quality sensing module includes a first sensor group 5, a second sensor group 6, and a third sensor group 7; the first sensor group 5 is installed at the inlet of the first-stage anion electrodialysis pre-desalination unit 3, the second sensor group 6 is installed at the outlet of the first-stage anion electrodialysis pre-desalination unit 3, and the third sensor group 7 is installed at the outlet of the second-stage polishing type electro-deionization treatment unit 4. The central industrial control module 8 has its signal input terminals connected to the signal output terminals of the first sensor group 5, the second sensor group 6, and the third sensor group 7, respectively, and its control signal output terminals connected to the first-stage anion electrodialysis pre-desalination unit 3 and the second-stage polishing type electrodeionization treatment unit 4, respectively.

[0027] Specifically, the pressure-bearing chamber assembly consists of two independent sealed units: a pre-desalination treatment chamber 1 and a deep polishing treatment chamber 2. This ensures the independence of each treatment environment while facilitating modular installation and maintenance. In the two-stage deep anion removal core module, the first-stage anion electrodialysis pre-desalination unit 3 is installed inside the pre-desalination treatment chamber 1, and the second-stage polishing-type electro-deionization treatment unit 4 is installed inside the deep polishing treatment chamber 2. The outlet of the first-stage unit and the inlet of the second-stage unit are connected in series, forming a tiered treatment process of "pre-desalination and deep polishing." The basic principle of electrodialysis technology is to utilize the selective permeability of ion exchange membranes under a direct current electric field to allow electrolyte ions to migrate directionally from the solution, thereby achieving desalination, concentration, or purification. Electro-deionization (EDI) technology organically combines electrodialysis and ion exchange. Ion exchange resin is filled between the compartments of the electrodialyzer. Utilizing the ion exchange effect of the resin and the selective permeability of the ion exchange membrane, directional migration and deep removal of ions are achieved under a direct current electric field. The first-stage unit utilizes a homogeneous anion-selective exchange membrane with high selective permeability for chloride and sulfate ions, combined with an alternating arrangement of cation exchange membranes, to migrate anions from the feed water from the mg / L level to the concentrate side under an electric field, achieving pre-desalination. The second-stage unit fills a compartment with a high-exchange-capacity gel-type anion exchange resin. Through efficient adsorption and capture of anions by the resin and continuous electrochemical regeneration under an electric field, residual anions are further reduced to the μg / L level. Simultaneously, the bipolar membrane module integrated in the second-stage unit can directionally dissociate water under an electric field, precisely releasing H₂. + or OH -This allows for precise adjustment of the effluent pH value during the deep desalination process. In the multi-parameter water quality sensing module, the first sensor group 5 is installed at the inlet of the first-stage unit to collect baseline data on the raw water quality; the second sensor group 6 is installed at the outlet of the first-stage unit to monitor the pre-desalination effect; and the third sensor group 7 is installed at the outlet of the second-stage unit to verify whether the final effluent meets the ultra-trace control target. These three sensor groups are arranged sequentially along the water flow direction, forming a water quality monitoring network covering the entire process, capable of acquiring key parameters such as chloride ion concentration, sulfate concentration, pH value, and conductivity in real time. The signal input terminals of the central industrial control module 8 are connected to the signal output terminals of the three sensor groups, receiving and processing real-time water quality data. Its control signal output terminals are electrically connected to the first-stage anion electrodialysis pre-desalination unit 3 and the second-stage polishing-type electrodeionization treatment unit 4, respectively. Based on the built-in two-stage coupled fuzzy PID control algorithm, the module dynamically adjusts the electrolysis voltage, current, and other operating parameters of the two-stage units according to the water quality data throughout the entire process. This device can stably control the chloride ion concentration in the intercooled circulating water to below 100 μg / L and the sulfate ion concentration to below 50 μg / L, while precisely maintaining the pH value within the optimal corrosion inhibition range of 7.0~8.3. This eliminates the risk of pitting corrosion, crevice corrosion and stress corrosion cracking caused by corrosive anions to carbon steel pipes and heat exchange equipment from the source.

[0028] For example, the first-stage anion electrodialysis pre-desalination unit 3 includes a DC electrolysis power supply, a pre-desalination compartment unit, and an inert electrode assembly; the pre-desalination compartment unit is disposed inside the pre-desalination treatment chamber 1, and the pre-desalination compartment unit is composed of multiple sets of homogeneous anion-selective exchange membranes and cation exchange membranes arranged alternately; the pre-desalination treatment chamber 1 has electrode chambers at both ends inside, and the inert electrode assembly is disposed in the electrode chamber; the DC electrolysis power supply is disposed outside the pre-desalination treatment chamber 1, and the inert electrode assembly is electrically connected to the positive and negative electrodes of the DC electrolysis power supply, respectively.

[0029] Specifically, the pre-desalination compartment unit is located inside the pre-desalination treatment chamber 1 and consists of multiple sets of homogeneous anion-selective exchange membranes and cation exchange membranes arranged alternately. The homogeneous anion-selective exchange membranes have a selective permeability of not less than 98% for chloride ions and sulfate ions, and a concentration diffusion coefficient not higher than 5 × 10⁻⁶. -8 m 2The membrane structure, with a diameter of 100 mm / s, effectively suppresses the back diffusion of ions from the concentrate side to the desalination side, ensuring the stability of pretreatment efficiency and the reliability of separation effect. Alternating dilute and concentrate chambers are formed between adjacent membranes. Driven by a DC electric field, anions such as chloride and sulfate in the desalination water selectively permeate through the homogeneous anion exchange membrane into the concentrate side, while cations migrate through the cation exchange membrane to the other side, thereby achieving the directional separation and enrichment of anions from the circulating water.

[0030] Furthermore, to ensure a uniform electric field distribution and maintain a stable driving force for ion migration, the pre-desalination treatment chamber 1 is equipped with electrode chambers at both ends. These electrode chambers are separated from the compartment by an ion exchange membrane to prevent electrode reaction products from interfering with the main treatment area. The inert electrode assembly is disposed within the electrode chamber and connected to the positive and negative terminals of a DC electrolysis power supply, respectively. Upon energization, a hydrolysis reaction occurs within the electrode chamber, producing hydrogen and oxygen, along with a small amount of H₂. + and OH - The generation of these electrode reaction products can be promptly discharged or neutralized through a separate electrode liquid circulation system in the electrode chamber, thereby effectively maintaining the pH stability and conductivity balance of the water in the main treatment area and avoiding the impact on desalination efficiency or secondary pollution caused by the diffusion of electrode chamber products.

[0031] The DC electrolysis power supply is located outside the pre-desalination treatment chamber 1. Its output voltage adjustment range is 0~60V, output current adjustment range is 0~300A, and voltage regulation accuracy is no greater than 0.5%. It can quickly respond to real-time commands from the central industrial control module 8, providing a stable and controllable power supply for the electrodialysis process. In particular, the inert electrode assembly adopts a titanium-based platinum-plated electrode. Its substrate is industrial pure titanium, and its surface is coated with a platinum metal layer. It has both the excellent mechanical strength and corrosion resistance of titanium, and the high conductivity and low gas evolution overpotential of the platinum layer significantly reduce ohmic polarization and gas evolution overpotential during the electrolysis process, reducing unnecessary energy loss. At the same time, it effectively avoids the problem of electrode surface oxidation passivation or dissolution of metal ions to pollute the water under long-term operation, thus ensuring the long-term working stability and electrochemical activity of the electrode under the special water quality conditions of low conductivity and low buffering capacity of intercooled circulating water.

[0032] The first-stage anion electrodialysis pre-desalination unit 3 of this invention can stably remove chloride ions from the mg / L level to below 1 mg / L and sulfate ions to below 0.5 mg / L in the influent under low energy consumption conditions. This not only significantly reduces the processing load of the subsequent deep treatment unit and avoids the impact pollution of polishing resin by high concentrations of anions, but also ensures the uniformity and continuity of the pretreated effluent quality through precise electric field control and stable electrode performance. This provides a reliable influent guarantee for the efficient and stable operation of the second-stage polishing-type electro-deionization treatment unit 4, allowing the synergistic purification efficiency of the entire two-stage coupled system to be fully utilized.

[0033] For example, the second-stage polishing-type electrodeionization treatment unit 4 includes a DC electrolysis power supply, an array-type deep polishing chamber unit, and a bipolar membrane assembly; the array-type deep polishing chamber unit is disposed inside the deep polishing treatment cavity 2, and the array-type deep polishing chamber unit is composed of multiple sets of alternating homogeneous anion selective exchange membranes and bipolar membranes, with ion exchange resin filling the spaces between adjacent homogeneous anion selective exchange membranes and bipolar membranes; the bipolar membrane assembly is disposed inside the deep polishing treatment cavity 2, and the DC electrolysis power supply is disposed outside the deep polishing treatment cavity 2, and the DC electrolysis power supply is electrically connected to the array-type deep polishing chamber unit and the bipolar membrane assembly respectively.

[0034] Specifically, the array-type deep polishing chamber unit is located inside the deep polishing processing cavity 2 and consists of multiple sets of alternating homogeneous anion-selective exchange membranes and bipolar membranes. Adjacent homogeneous anion-selective exchange membranes and bipolar membranes form independent chambers filled with ion exchange resin. This ion exchange resin is specifically a gel-type anion exchange resin with a total exchange capacity of not less than 4.0 mmol / g. It can efficiently adsorb free chloride and sulfate ions in water through electrostatic forces by means of fixed ion exchange groups on the resin backbone in low-concentration solution environments, achieving rapid capture and enrichment of trace anions. Under the drive of a DC electric field, the anions adsorbed on the resin undergo directional transitions along the resin phase, passing through the homogeneous anion-selective exchange membrane into the concentrate side. Meanwhile, the bipolar membrane, under the action of the electric field, can dissociate water molecules in situ into H+. + and OH - H + They migrate to the anion exchange resin layer to participate in the resin regeneration reaction, enabling the resin to regain its exchange capacity, thereby achieving a dynamic balance between ion exchange and electrochemical regeneration.

[0035] Meanwhile, the H generated by the bipolar film module + and OH - It can also be directed to the treated water body according to the instructions of the central industrial control module 8, and add OH- when the pH value of the effluent is detected to be too low. - Release amount to increase pH value, and increase H when pH value is too high. + The release amount is used to lower the pH value, thereby achieving precise closed-loop adjustment of pH value during the deep removal of anions, so that the chloride ion concentration of the final effluent is stably controlled below 100 μg / L, the sulfate concentration is controlled below 50 μg / L, and the pH value is precisely maintained in the optimal corrosion inhibition range of 7.0~8.3.

[0036] The DC electrolysis power supply is located outside the deep polishing chamber 2 and is electrically connected to the array-type deep polishing compartment unit and the bipolar film assembly, respectively. Its output voltage adjustment range is 0~30V, output current adjustment range is 0~100A, and ripple coefficient is no greater than 0.1%. It can provide low-ripple and high-stability DC power supply for electric field-driven ion migration and bipolar film water dissociation, effectively suppressing the interference of the pulsating components of the electrolysis current on the ultra-trace ion migration process, and ensuring that the deep processing unit can still maintain stable and efficient desalination performance under ultra-low concentration conditions at the μg / L level.

[0037] For example, the central industrial control module 8 includes a main control chip, a programmable logic controller, a data processing unit, a control algorithm unit, a fault diagnosis and interlocking protection unit, and an industrial network communication unit; The main control chip is connected to the programmable logic controller; the data processing unit, the control algorithm unit, the fault diagnosis and interlocking protection unit, and the industrial network communication unit are respectively connected to the main control chip; the signal input terminal of the data processing unit is connected to the signal output terminal of the multi-parameter water quality sensing module; the signal output terminal of the control algorithm unit is electrically connected to the control signal input terminals of the first-stage anion electrodialysis pre-desalination unit 3 and the second-stage polishing electro-deionization treatment unit 4; the signal input terminal of the fault diagnosis and interlocking protection unit is connected to the voltage of the first-stage anion electrodialysis pre-desalination unit 3. The detection terminal, the voltage detection terminal of the second-stage polishing electro-deionization treatment unit 4, the differential pressure detection terminal of the pre-desalination treatment chamber 1, the differential pressure detection terminal of the deep polishing treatment chamber 2, and the signal output terminal of the multi-parameter water quality sensing module are connected; the signal output terminal of the fault diagnosis and interlocking protection unit is connected to the control signal input terminal of the first-stage anion electrodialysis pre-desalination unit 3, the control signal input terminal of the second-stage polishing electro-deionization treatment unit 4, and the control signal input terminal of the circulating water pipeline module, respectively; the industrial network communication unit is connected to the power plant DCS system and SIS system through the industrial communication interface, respectively.

[0038] Specifically, the main control chip preferably adopts a 32-bit industrial-grade ARM Cortex-M7 series microcontroller, which has powerful floating-point operation capabilities and multi-channel high-speed data acquisition and processing performance. It is paired with a Siemens S7-300 series programmable logic controller (PLC) as the execution support for logic control and switch output. The two are interconnected through an industrial bus, forming a collaborative architecture in which the ARM is responsible for algorithm calculation and data processing, and the PLC is responsible for logic judgment and device driving. This ensures the efficient real-time operation of complex control algorithms, while also taking into account the dual requirements of industrial site for I / O expansion flexibility and logic control reliability.

[0039] The data processing unit, control algorithm unit, fault diagnosis and interlocking protection unit, and industrial network communication unit are connected to the main control chip and operate collaboratively. The signal input terminal of the data processing unit is connected to the signal output terminal of the multi-parameter water quality sensing module. It receives raw water quality signals from the first sensor group 5, the second sensor group 6, and the third sensor group 7 in real time, including chloride ion concentration, sulfate concentration, pH value, conductivity, temperature, and flow rate. The data processing unit performs preprocessing operations such as digital filtering, temperature compensation, nonlinear calibration, and dimensional normalization to eliminate measurement deviations caused by sensor drift and environmental interference. The preprocessed water quality feature vector is then transmitted to the control chip. The algorithm unit incorporates an intelligent decision-making algorithm based on a two-stage coupled fuzzy PID (proportional-integral-derivative) control model. It can simultaneously calculate the optimized control parameters, such as electrolysis voltage, current, and concentrate circulation frequency, required by the first-stage anion electrodialysis pre-desalination unit 3 and the second-stage polishing electro-deionization treatment unit 4, based on the real-time anion concentration and pH deviation at each monitoring point throughout the entire process, combined with the unit's current operating load and circulating water concentration ratio. Its signal output terminals are electrically connected to the controlled terminals of the two units, achieving coordinated dynamic matching and decoupling control between the pre-desalination and post-polishing two-stage treatment processes. This avoids control instability caused by mutual interference or parameter conflicts between the two stages.

[0040] The fault diagnosis and interlock protection unit is a crucial guarantee for the safe operation of the device. Its signal input terminals are connected to the electrolysis voltage detection terminals of the first-stage unit, the second-stage unit, the inlet / outlet water differential pressure detection terminals of the pre-desalination treatment chamber 1, the inlet / outlet water differential pressure detection terminals of the deep polishing treatment chamber 2, and the water quality signal output terminal of the multi-parameter water quality sensing module. It can collect and comprehensively analyze multi-dimensional status information in real time, such as changes in electrolytic cell pressure, changes in differential pressure across the membrane module, and the deviation trend of key water quality indicators in the effluent. When it detects an abnormal increase in electrolysis voltage, excessive differential pressure across the membrane module, or the chloride or sulfate concentration in the effluent approaching the limit, it will detect the fault. When abnormal signs such as exceeding the threshold are detected, the signal output terminal of this unit can immediately send corresponding load reduction commands, shutdown protection commands, or valve switching commands to the control input terminals of the first-level unit, the second-level unit, and the circulating water pipeline module, respectively, triggering graded safety interlocking actions. First, it automatically adjusts the electrolysis parameters to try to restore stability. If the abnormality continues, it executes shutdown protection and locks the fault state, effectively preventing the effluent water quality from exceeding the standard or the equipment damage from expanding due to equipment failure. At the same time, it issues an audible and visual alarm and reports the fault information to the power plant's distributed control system (DCS) through the industrial network communication unit.

[0041] The industrial network communication unit integrates multiple standard industrial communication protocols such as industrial Ethernet, Profinet, and Modbus TCP / IP. It connects to the DCS and the plant-level monitoring information system (SIS) through industrial communication interfaces. It can not only upload information such as the device's operating status, real-time water quality data, and fault alarms to the power plant's unified monitoring platform, but also receive remote start / stop commands and operating mode switching commands from the DCS, realizing deep integration and centralized control of the ion purification device and the power plant's main system.

[0042] For example, the central industrial control module 8 executes the following control logic: Acquire online water quality data for the entire process of the unit load and circulating water system; determine the control targets for chloride and sulfate concentrations and pH value based on the unit load and online water quality data; acquire the actual anion concentration and pH value of the circulating water, and calculate the concentration deviation and pH value deviation; based on the deviation, dynamically adjust the electrolysis parameters of the device and the circulating water flow rate using a two-stage coupled fuzzy PID control algorithm.

[0043] To achieve the above control logic, this invention establishes the following dynamic optimization model. The objective function for anion removal in the intercooled circulating water system is... for:

[0044] in, l represents the total number of processing units. i m i g i C is the weighting coefficient. i,set C represents the target value for controlling the anion concentration of the i-th processing unit; i (t) represents the actual anion concentration at time t in the i-th processing unit; u i (t) represents the electrolytic current output value at time t; pH i (t) represents the pH value at time t in the i-th treatment unit.

[0045] Its constraints are: 0≤ u i ( t )≤ u i,max C i ( t )≤ C i , max 7≤pH i (t)≤8.3 in,u i,max is the maximum electrolysis current; C i，max is the upper limit of the anion concentration.

[0046] The present invention realizes the coordinated optimization control of anion concentration and pH value by collecting the unit load and water quality parameters in real time, establishing a dynamic control target model. Based on the load change, it predicts the water quality fluctuation trend, combines the online monitoring data to intelligently correct the control target, and uses a two-stage coupled fuzzy PID control algorithm to accurately adjust the electrolysis parameters, which not only avoids the response lag of traditional methods to the change of working conditions but also overcomes the limitations of single parameter control. Among them, the online water quality data includes chloride ion concentration, sulfate ion concentration, pH value, conductivity, ORP value, turbidity, iron content; the unit load is the real-time output power of the generator set supporting the indirect cooling circulating water system. By comprehensively monitoring multi-dimensional key water quality parameters and combining the real-time load data of the unit, the overall operation conditions of the circulating water system are comprehensively perceived. This multi-parameter coordinated monitoring mechanism can accurately identify the system corrosion state and water quality change trend, provide a more comprehensive decision-making basis for the deep removal of anions and pH regulation, and effectively solve the limitations of traditional single parameter control. In practical applications, the control target of chloride ion concentration is set to ≤100 μg / L, the control target of sulfate ion concentration is set to ≤50 μg / L, and the control target of pH value is set to 7.0 - 8.3, which is dynamically adjusted according to factors such as unit load and iron content. By using a two-stage coupled fuzzy PID control algorithm, the batch removal of mg / L level anions is achieved through the first-stage pre-desalination unit, and the precise capture of μg / L level anions is achieved by combining the second-stage deep treatment unit, forming an intelligent control strategy with self-adaptive ability. This algorithm realizes the accurate prediction of the change of anion concentration by establishing an accurate anion migration equilibrium model and incorporating key parameters such as pipeline volume, water flow rate, and membrane selective permeability into the control equation; by solving the quadratic programming problem online through a rolling optimization mechanism and dynamically adjusting the electrolysis parameters under the premise of meeting the constraint conditions, it not only ensures the real-time nature of the control but also ensures the optimality of the system response.

[0047] Exemplarily, the first sensor group 5, the second sensor group 6, and the third sensor group 7 all include an ion chromatograph, a pH sensor, a conductivity sensor, an oxidation-reduction potential sensor, a temperature sensor, and a flow sensor; the signal output ends of each sensor are connected to the data input end of the central industrial control module 8.

[0048] Specifically, the ion chromatography analyzer is used for online continuous detection of trace chloride and sulfate ion concentrations in circulating water, with a detection accuracy of up to 1 μg / L. It can provide precise anion concentration feedback for the two-stage desalination unit within the ultra-trace concentration range. The pH sensor uses a 0.01-grade high-precision industrial electrode to monitor changes in hydrogen ion activity in the water in real time. Its millisecond-level response speed provides a reliable real-time basis for bipolar membrane pH control. The conductivity sensor is used to indirectly reflect the overall level of total dissolved ion concentration in the water, serving as an auxiliary reference for judging the overall desalination effect and monitoring the integrity of the membrane components. Oxidation... The redox potential sensor effectively characterizes the oxidizing atmosphere of the system by measuring the redox potential of the water, providing auxiliary information for assessing the corrosion tendency of circulating water and predicting the interference of reducing substances. The temperature sensor monitors the water temperature at each process point, providing necessary parameters for temperature compensation correction of ion chromatography and conductivity, and providing a basis for monitoring the thermal effect of membrane modules during electrolysis. The flow sensor records the water flow velocity and treated water volume at each measuring point in real time, ensuring that the hydraulic residence time of the two-stage units is within the optimized setting range, and providing flow data support for the fine control of the frequency conversion regulation of the circulating pump and the concentrated wastewater discharge cycle.

[0049] All the aforementioned sensors employ 4-20mA industrial standard analog signals or RS485 digital bus signal outputs, and possess IP65 or higher protection ratings to adapt to the complex environments of power plants, such as humidity, heat, and dust. Data acquisition frequency is no less than once every 5 seconds, ensuring the timely response and data redundancy of the control system. This multi-point, multi-parameter sensor configuration scheme of the present invention sequentially acquires raw water baseline data, pre-desalination transition data, and final product water quality data along the water flow direction. This provides the central industrial control module 8 with full-chain, multi-dimensional real-time data support, enabling the control algorithm to accurately identify the processing efficiency and coupling effects of the upstream and downstream stages, thereby achieving precise and coordinated adjustment of the electrolysis parameters of the two processing units.

[0050] For example, such as Figure 2 As shown, the present invention also includes a circulating water pipeline module, which includes a freshwater circulation unit and a concentrated water circulation unit; The freshwater circulation unit includes a booster centrifugal pump 9, a flow regulating valve 11, a check valve 10, and a manual maintenance valve 12. The outlet of the booster centrifugal pump 9 is connected to the inlet of the flow regulating valve 11, and the outlet of the flow regulating valve 11 is connected to the inlet of the pre-desalination treatment chamber 1. The check valve 10 and the manual maintenance valve 12 are sequentially installed between the booster centrifugal pump 9 and the pre-desalination treatment chamber 1. The booster centrifugal pump 9 is driven by a variable frequency drive, which can steplessly adjust the speed according to the frequency command output by the central industrial control module 8 based on the real-time water treatment demand. This allows for flexible adjustment of the bypass flow rate under different load conditions of the unit, ensuring sufficient anions in both stages of the unit. Sufficient electromigration residence time is provided to achieve efficient removal while avoiding ineffective energy consumption and hydraulic shock of the membrane module under high flow conditions. The flow regulating valve 11, as a fine-tuning actuator, forms a two-stage flow control strategy with the booster centrifugal pump 9, which combines coarse and fine adjustment. This effectively suppresses flow pulsation caused by pipeline resistance fluctuations and ensures that the water flow entering the pre-desalination chamber is stable and uniform. The check valve 10 is installed on the pump outlet pipeline to prevent backflow of circulating water from impacting the pump impeller and damaging the mechanical seal when the pump is stopped unexpectedly. The manual maintenance valve 12 is set in the isolation section before and after the pipeline, providing a convenient mechanical shut-off means for daily inspection and fault isolation. This allows for the replacement and maintenance of pump sets or valves without draining the main water body of the system.

[0051] The concentrate circulation unit includes a pre-desalination concentrate system and a deep treatment concentrate system. The pre-desalination concentrate system includes a first concentrate tank 13, a first concentrate circulation pump 14, a first drain valve 15, and a first water supply valve 16. The outlet of the first concentrate tank 13 is connected to the inlet of the first concentrate circulation pump 14, and the drain outlet of the first concentrate tank 13 is connected to the inlet of the first drain valve 15. The first water supply valve 16 is installed between the water supply outlet of the first concentrate tank 13 and the outlet of the pre-desalination treatment chamber 1. The outlet of the first concentrate circulation pump 14 is connected to the concentrate inlet of the pre-desalination treatment chamber 1. The first concentrate tank 13 is used to receive and temporarily store high-concentration saline wastewater discharged from the concentrate side of the pre-desalination unit. The first concentrate circulation pump 14... 4. The concentrate in the concentrate tank is continuously pumped back to the concentrate chamber of the pre-desalination chamber, so that the concentrate continuously accumulates anions migrating from the desalination side in the closed-loop circulation, thereby maintaining a sufficiently high concentration gradient between the concentrate and desalination sides, providing a stable driving force for the continuous transmembrane migration of anions. When the chloride ion concentration in the first concentrate tank 13 reaches the preset threshold due to continuous accumulation, the central industrial control module 8 automatically opens the first drain valve 15 to discharge part of the concentrate. After the liquid level drops to the low limit, the drain valve is closed and the first water supply valve 16 is opened to replenish high-purity desalinated water to the high limit, thereby controlling the ion concentration on the concentrate side within a reasonable range, which not only ensures the transmembrane migration efficiency, but also avoids the risk of osmotic pressure imbalance or salt crystal precipitation caused by excessive concentration.

[0052] The advanced treatment concentrate system includes a second concentrate tank 17, a second concentrate circulation pump 18, a second drain valve 19, and a second make-up valve 20. The outlet of the second concentrate tank 17 is connected to the inlet of the second concentrate circulation pump 18, and the drain outlet of the second concentrate tank 17 is connected to the inlet of the second drain valve 19. The second make-up valve 20 is installed between the make-up outlet of the second concentrate tank 17 and the outlet of the advanced polishing chamber 2. The outlet of the second concentrate circulation pump 18 is connected to the concentrate inlet of the advanced polishing chamber 2. Its working principle is similar to that of the pre-desalination concentrate system. The second concentrate tank 17 collects saline wastewater from the concentrate side of the advanced treatment unit and sends it back to the concentrate chamber of the chamber via the second concentrate circulation pump 18, maintaining the necessary ion concentration on the concentrate side of the advanced treatment unit. The temperature and conductivity ensure the continuity of the electro-deionization process. In particular, the concentrate outlet of the deep polishing treatment chamber 2 is also connected to the inlet of the pre-desalination treatment chamber 1 through a return pipeline. This allows the saline concentrate discharged from the concentrate side of the second-stage deep treatment unit to be returned to the inlet of the first-stage pre-desalination unit for reprocessing. This is because the anion concentration in the concentrate of the deep treatment unit is much lower than that on the concentrate side of the pre-desalination unit. Direct discharge would result in water waste. However, after returning it to the inlet of the pre-desalination unit, the residual anions can migrate and accumulate again to the pre-desalination concentrate side under the action of the first-stage electric field. Finally, it is discharged through the drain valve of the pre-desalination concentrate system, realizing the cascade utilization and centralized discharge of concentrate, which greatly improves the overall water recovery rate of the system.

[0053] For example, the present invention also includes an automatic online cleaning and regeneration module for membrane modules, which includes an ultrasonic cleaning unit, an online cleaning unit, and a membrane fouling status assessment unit. The ultrasonic cleaning unit includes two ultrasonic transducers, which are respectively installed on the side wall of the pre-desalination treatment chamber 1 and the side wall of the deep polishing treatment chamber 2. The online cleaning unit is connected to the pre-desalination treatment chamber 1 and the deep polishing treatment chamber 2. The signal input terminal of the membrane fouling status assessment unit is connected to the voltage detection terminal of the first-stage anion electrodialysis pre-desalination unit 3, the voltage detection terminal of the second-stage polishing type electrodeionization treatment unit 4, the differential pressure detection terminal of the pre-desalination treatment chamber 1, the differential pressure detection terminal of the deep polishing treatment chamber 2, and the signal output terminal of the multi-parameter water quality sensing module. The control signal output terminal of the membrane fouling status assessment unit is electrically connected to the control signal input terminal of the ultrasonic cleaning unit and the control signal input terminal of the online cleaning unit.

[0054] Specifically, the ultrasonic cleaning unit includes two ultrasonic transducers, which are respectively installed on the side wall of the pre-desalination treatment chamber 1 and the side wall of the deep polishing treatment chamber 2. When the membrane fouling status assessment unit determines that the membrane module needs cleaning, the central industrial control module 8 starts the ultrasonic transducers to emit high-frequency ultrasonic waves with a frequency range between 20kHz and 40kHz into the chamber. When the ultrasonic waves in this frequency band propagate in the liquid medium, they generate a large number of microbubbles through cavitation effect. These bubbles grow and collapse periodically under the action of the sound field. At the moment of collapse, extremely high instantaneous pressure and microjets are generated locally, which can effectively impact and peel off suspended matter, microbial colonies and colloidal pollutants attached to the surface of ion exchange membrane and resin particles. At the same time, ultrasonic vibration can also promote the loosening and removal of blockages in the membrane pores, thereby achieving non-contact, dead-angle-free cleaning of the membrane surface and resin layer. Moreover, the entire cleaning process does not require the introduction of any chemical cleaning agents into the system, avoiding the risk of chemical damage to the membrane material and resin or the introduction of secondary pollution.

[0055] The online cleaning unit is connected to the pre-desalination treatment chamber 1 and the deep polishing treatment chamber 2 respectively. This unit supports auxiliary cleaning operations without shutting down the unit. When the ultrasonic cleaning effect is insufficient or when facing more stubborn pollutants, the central industrial control module 8 can trigger a polarity reversal cleaning program through the online cleaning unit. That is, the polarity of the DC electrolysis power output of the two-stage unit is temporarily switched, so that the electric field direction on both sides of the ion exchange membrane is reversed. The charged pollutants and deposits that were originally deposited on the membrane surface under the action of electric field force are removed from the membrane surface under the action of reverse electric field force and carried out of the chamber with the circulating water flow. At the same time, the operating frequency of the circulating water pump is adjusted to achieve water flow pulse flushing. The effect of stripping and removing pollutants from the membrane surface is further enhanced by the periodically changing fluid force. The above online cleaning program does not require disassembling the membrane module or shutting down the entire unit. It can be completed under the condition of maintaining low load operation of the unit, which greatly reduces the impact of cleaning and maintenance on the continuity of the unit's circulating water treatment.

[0056] The signal input terminal of the membrane fouling status assessment unit is connected to the electrolysis voltage detection terminal of the first-stage pre-desalination unit, the electrolysis voltage detection terminal of the second-stage deep treatment unit, the inlet and outlet pressure difference detection terminal of the pre-desalination treatment chamber 1, the inlet and outlet pressure difference detection terminal of the deep polishing treatment chamber 2, and the water quality signal output terminal of the three sensor groups in the multi-parameter water quality sensing module. The assessment unit quantitatively judges the degree of fouling of the membrane module by real-time acquisition and comprehensive analysis of multi-source data such as electrolytic cell pressure, pressure difference across the membrane module, and anion removal rate. As contaminants gradually accumulate on the membrane surface, the membrane resistance increases, leading to a significant increase in the tank pressure under the same electrolysis current. Simultaneously, membrane pore blockage increases water flow resistance, causing a rise in the pressure difference between the inlet and outlet of the chamber. The decrease in anion migration efficiency directly manifests as an upward trend in the concentration of chloride or sulfate ions in the effluent. When the evaluation unit detects that the tank pressure has increased by more than 15% from the initial value or the anion removal rate has decreased by more than 8%, it determines that the membrane module has significant fouling and the cleaning process needs to be initiated. Its control signal output terminal is electrically connected to the control signal input terminal of the ultrasonic cleaning unit and the control signal input terminal of the online cleaning unit, respectively. It can automatically select the appropriate cleaning method according to the degree of fouling. For mild fouling, the ultrasonic cleaning program is initiated first, with the single cleaning time set between 3 and 8 minutes. If the membrane performance recovers to the normal range after ultrasonic cleaning, it automatically switches back to the operating state. If the fouling is more severe, the online cleaning unit is further triggered to execute a polarity reversal and water flow pulse combined cleaning program. After the cleaning is completed, the membrane performance is confirmed to have recovered through real-time monitoring data before the normal operation is automatically restored.

[0057] A second objective of this invention is to provide a method of using an ion purification device, comprising the following steps: The circulating water flows sequentially through the pre-desalination treatment chamber 1 and the deep polishing treatment chamber 2; The first sensor group 5 collects the water quality parameters at the inlet of the pre-desalination treatment chamber 1, the second sensor group 6 collects the water quality parameters at the outlet of the pre-desalination treatment chamber 1, and the third sensor group 7 collects the water quality parameters at the outlet of the deep polishing treatment chamber 2. The central industrial control module 8 receives the collected water quality parameters and controls the operation of the first-stage anion electrodialysis pre-desalination unit 3 and the second-stage polishing electrodeionization treatment unit 4 according to the water quality parameters.

[0058] Specifically, it includes: After the device is connected to the AC380V industrial power supply, the central industrial control module 8 performs a power-on self-test on all modules, confirming one by one whether the sensor communication link is normal, whether the main circuit of the electrolysis power supply is in good working order, whether the switching positions of the circulating water pump and electric valve are accurate, and whether the various protection functions of the power management module are in a ready state. The entire self-test process lasts 10 to 15 seconds. Then, it simulates the effluent water quality exceeding the standard and typical electrical faults to trigger the interlock protection action, verifying the reliability and response speed of the fault shutdown interlock protection circuit. Only after confirming that everything is normal can the device enter the standby state. If any abnormality is found in any item during the self-test or interlock test, a fault alarm will be issued immediately through the audible and visual alarm unit and the industrial display screen, and the fault code and diagnostic information will be uploaded to the power plant DCS system. At the same time, the device start command will be blocked to prevent the safety risk of operating with defects.

[0059] After receiving the start command from the local control panel or DCS remotely, the central industrial control module 8 first opens the inlet electric valve and starts the freshwater circulation pump. By adjusting the flow regulating valve 11 to the preset opening, the intercooled circulating water flows into the first-stage pre-desalination unit and the second-stage deep treatment unit at a set flow rate, gradually purging the air in the two chambers. After the water circuit is full, the two-stage concentrate circulation pump is started to put the concentrate side into a closed-loop circulation state. After the water flow stabilizes, all sensors of the multi-parameter high-precision intelligent water quality sensing module synchronously acquire water quality parameters such as chloride ion concentration, sulfate concentration, pH value, conductivity, temperature and treatment flow rate at three key measuring points: the first-stage inlet, the first-stage outlet and the second-stage outlet, at a sampling frequency of no less than once every 5 seconds. At the same time, the liquid level and anion concentration of the pre-desalination concentrate tank and the deep treatment concentrate tank are monitored. All data are uploaded to the central industrial control module 8 in real time for subsequent decision-making.

[0060] The data processing unit within the central industrial control module 8 performs preprocessing on the received sensor signals, including digital filtering, temperature compensation correction, and dimensional normalization, to eliminate errors caused by measurement noise and environmental drift. Subsequently, it compares the actual water quality indicators at the second-stage outlet with preset control thresholds: chloride ion concentration not exceeding 100 μg / L, sulfate concentration not exceeding 50 μg / L, and pH value between 7.0 and 8.3. Simultaneously, it integrates multi-dimensional information such as the unit's current operating load, circulating water concentration ratio, and the actual effluent effect of the first-stage pre-desalination unit, and invokes the built-in two-stage coupling control... The system automatically matches the optimal mode among five basic operating modes. The automatic mode is suitable for normal operating conditions with stable water quality; the powerful deep purification mode is suitable for situations where the influent water quality deteriorates or the effluent indicators are close to exceeding the limit; the energy-saving mode is suitable for operating conditions where the unit is running at low load and the influent water quality is good; the shutdown protection mode is suitable for actively switching off when the effluent water quality is seriously exceeding the standard or the equipment status is abnormal; and the manual maintenance mode allows maintenance personnel to manually lock the equipment status during shutdown maintenance. Operators can also manually switch modes through the industrial human-machine interface or DCS system according to the actual situation on site.

[0061] The central industrial control module 8 outputs differentiated control parameters to the two-stage units according to the matched operating mode. When the chloride ion concentration in the first-stage influent reaches 50 mg / L or above, or the sulfate concentration reaches 100 mg / L or above, it automatically increases the output power of the electrolysis power supply in the pre-desalination unit and simultaneously increases the operating frequency of the concentrate circulation pump to enhance the transmembrane migration efficiency of anions from the freshwater side to the concentrate side, thus stabilizing the chloride ion concentration in the first-stage effluent below 1 mg / L and the sulfate concentration below 0.5 mg / L, providing stable and low-load influent conditions for the subsequent deep treatment unit; when the second When the chloride ion concentration in the primary effluent rises to 80 μg / L or above, or the sulfate concentration rises to 40 μg / L or above, the system automatically switches to a powerful deep purification mode. This increases the output current of the second-stage DC electrolysis power supply to enhance the electric field strength within the chamber, optimizes the electrochemical regeneration efficiency of the gel-type anion exchange resin, and ensures that the resin always maintains sufficient effective exchange capacity to achieve stable deep capture of trace anions. Regarding pH control, when the pH of the secondary effluent is below 7.0, the central industrial control module 8 adjusts the electric field polarity of the bipolar membrane within the secondary unit to directionally release OH- into the treated water. - To increase the pH value, when the pH value is higher than 8.3, the bipolar membrane is reverse-regulated to release H₂ in a directional manner. +To lower the pH value, the pH value of the effluent is precisely maintained within the range of 7.0 to 8.3, which is most conducive to the stable existence of the passivation film on the carbon steel surface. Under normal water quality conditions, the device defaults to automatic mode. The central industrial control module 8 continuously calculates the rate of change and cumulative amount of concentration deviation and pH deviation through an embedded fuzzy PID control algorithm, and dynamically adjusts the operating variables such as electrolysis voltage, electrolysis current, treatment water distribution ratio and concentrate discharge cycle of the two-stage units. This constructs a closed-loop regulation system that decouples and coordinates the anion concentration control and pH value control, effectively avoiding parameter coupling oscillation between the two-stage units and ensuring that the effluent water quality always meets the standards during continuous operation around the clock.

[0062] During long-term operation of the device, the membrane fouling status assessment unit continuously collects key characterization parameters such as the electrolyzer pressure, the pressure difference across the membrane module, and the anion removal rate at each measuring point in the first and second stage units. When the electrolyzer pressure increases by more than 15% from the initial value or the anion removal rate decreases by more than 8% from the baseline value, the system automatically determines that the membrane module has significant fouling. The system first activates the ultrasonic transducers installed on the side walls of the two chambers to perform an ultrasonic cleaning program with a frequency of 20 to 40 kHz. Each cleaning lasts 3 to 8 minutes, utilizing the ultrasonic cavitation effect to remove suspended solids, microorganisms, and colloids attached to the membrane surface and resin layer surface. If the membrane performance returns to normal after cleaning, the system automatically switches back to operation. If the fouling is severe, a polarity reversal cleaning procedure is triggered. This procedure briefly switches the DC power output polarity and regulates the operation of the circulation pump to generate pulsed water flow. Under the combined action of reverse electric field force and periodic hydraulic impact, stubborn pollutants are peeled off from the membrane surface and discharged from the chamber. After cleaning, the chamber is rinsed with clean water to confirm performance recovery. At the same time, the time, method, and effect data of this cleaning event are uploaded to the DCS system, and a preventive maintenance reminder is issued. This achieves online regeneration maintenance without disassembling the membrane module or adding chemical agents.

[0063] During operation, the central industrial control module 8 monitors the chloride ion concentration in the pre-desalination concentrate tank and the deep treatment concentrate tank in real time through an ion concentration sensor installed in the concentrate tank. When the chloride ion concentration in the pre-desalination concentrate tank reaches the preset discharge threshold of not less than 15,000 mg / L due to continuous enrichment, the first drain valve 15 is automatically opened to discharge the high-concentration concentrate into the power plant wastewater neutralization treatment system. After the liquid level drops to the low limit, the drain valve is closed and the first water supply valve 16 is opened to replenish fresh high-purity demineralized water to the high limit, thereby controlling the ion concentration on the concentrate side within a reasonable operating range. This approach ensures the concentration gradient driving force required for the continuous transmembrane migration of anions on the freshwater side while avoiding the risk of salt supersaturation and crystallization. The saline concentrate in the deep treatment concentrate tank, with a much lower anion concentration than the pre-desalination concentrate, is not directly discharged but is instead led back to the inlet of the pre-desalination unit via a return pipeline to re-enter the first-stage treatment process. The residual anions in the concentrate can be migrated and enriched again on the pre-desalination concentrate side under the electric field of the pre-desalination unit and finally discharged centrally through the pre-desalination wastewater discharge system. This achieves the cascade utilization and centralized discharge of concentrate, significantly reducing the total wastewater discharge of the system.

[0064] When the central industrial control module 8 receives a valid shutdown command or triggers interlock protection conditions due to severely excessive effluent quality, the system first cuts off the output of the first and second stage DC electrolysis power supplies to terminate the electrochemical reaction. However, it maintains the freshwater circulation pump and concentrated water circulation pump running for 5 to 8 minutes to fully replace the residual treated water in the chamber and promptly remove residual ions attached to the membrane surface and resin layer. Subsequently, it sequentially shuts off the circulating water pumps and inlet / outlet valves, opens the drain valve at the bottom of the chamber to drain all the internal water to prevent freezing damage in low-temperature environments or the growth of microorganisms during long-term shutdown. The device then enters standby mode to await the next startup. If the shutdown is triggered by a fault, the system locks the fault state and saves all operating data at the time of the fault. It can only be restarted after maintenance personnel have completed fault troubleshooting and manually reset the system, effectively avoiding accidental startup and secondary damage to the equipment under fault conditions.

[0065] Example 1 This embodiment describes a bypass purification device applicable to the indirect air-cooled circulating water system of a 660MW ultra-supercritical coal-fired power generating unit. The unit has extremely stringent requirements for circulating water quality control: chloride ion concentration ≤100μg / L, sulfate concentration ≤50μg / L, and pH value 7.0~8.3. The original circulating water makeup water was secondary demineralized water. During operation, it was contaminated by factors such as dissolved carbon dioxide from the air and the leaching of trace corrosion products within the system. The chloride ion concentration gradually increased to 25~35mg / L, and the sulfate concentration increased to 40~50mg / L. The measured corrosion rate of the carbon steel heat exchange tubes was 0.09mm / a, far exceeding the national standard limit (≤0.075mm / a). The original corrosion inhibitor addition process could no longer meet the extremely stringent control requirements.

[0066] The device in this embodiment employs two parallel two-stage processing systems, with each system having a processing capacity of 100m. 3 / h, total water treatment capacity is 200m³ 3 / h. A single system is configured with a horizontal 316L stainless steel pre-desalination chamber and a deep polishing chamber, connected in series via pipelines. The outlet of the first-stage anion electrodialysis pre-desalination unit 3 is connected to the inlet of the second-stage polishing electro-deionization treatment unit 4. The pre-desalination chamber contains 40 array-type compartment units, equipped with homogeneous anion selective exchange membranes with a total effective area of ​​160m². 2 The homogeneous anion-selective exchange membrane has a selective permeability of no less than 98% for chloride and sulfate ions; the deep polishing chamber is equipped with 30 arrayed compartment units, and the total effective area of ​​the matching homogeneous anion-selective exchange membrane and bipolar membrane is 120m². 2 The compartment between adjacent homogeneous anion-selective exchange membranes and bipolar membranes is filled with a high-exchange-capacity gel-type anion exchange resin, wherein the total exchange capacity of the gel-type anion exchange resin is not less than 4.0 mmol / g. Both ends of the pre-desalting chamber and the deep polishing chamber are equipped with electrode chambers, in which titanium-based platinum-plated inert electrode assemblies are installed. The pre-desalting chamber is equipped with a high-frequency regulated DC electrolysis power supply, with an output voltage adjustment range of 0~60V, an output current adjustment range of 0~300A, and a voltage regulation accuracy of not more than 0.5%; the deep polishing chamber is equipped with a low-ripple, high-precision DC electrolysis power supply, with an output voltage adjustment range of 0~30V, an output current adjustment range of 0~100A, and a ripple coefficient of not more than 0.1%.

[0067] The freshwater circulation unit is equipped with two variable frequency stainless steel booster centrifugal pumps, each with a rated flow rate of 200 m³ / h. 3 The system operates on a 1 / h, standby configuration. The outlet of the booster centrifugal pump 9 is connected to the inlet of the flow regulating valve 11, and the outlet of the flow regulating valve 11 is connected to the inlet of the pre-desalination treatment chamber 1. A check valve 10 and a manual maintenance valve 12 are sequentially installed between the booster centrifugal pump 9 and the pre-desalination treatment chamber 1. The concentrate circulation unit is independently configured with a first concentrate tank 13, a second concentrate tank 17, and corresponding concentrate circulation pumps, drain valves, and water supply valves. The concentrate outlet of the deep polishing treatment chamber 2 is connected to the inlet of the pre-desalination treatment chamber 1 via a return pipeline, enabling the cascade utilization of concentrate.

[0068] In the multi-parameter water quality sensing module, the first sensor group 5 is installed at the inlet of the first-stage anion electrodialysis pre-desalination unit 3, the second sensor group 6 is installed at the outlet of the first-stage anion electrodialysis pre-desalination unit 3, and the third sensor group 7 is installed at the outlet of the second-stage polishing-type electrodeionization treatment unit 4. Each sensor group is equipped with an online ion chromatograph, which can detect chloride and sulfate concentrations at the μg / L level in real time. It also integrates a pH sensor, conductivity sensor, redox potential sensor, temperature sensor, and flow sensor. The signal output terminals of each sensor are connected to the data input terminals of the central industrial control module 8. The central industrial control module 8 uses an industrial-grade ARM main control chip + Siemens S7-300 PLC, incorporates a two-stage coupled fuzzy PID control algorithm, and is equipped with a Profinet industrial Ethernet interface, allowing seamless integration with the unit's DCS system. The signal input terminal of the membrane fouling status assessment unit is connected to the electrolysis voltage detection terminal of the first-stage pre-desalination unit, the electrolysis voltage detection terminal of the second-stage deep treatment unit, the differential pressure detection terminal of the pre-desalination treatment chamber 1, the differential pressure detection terminal of the deep polishing treatment chamber 2, and the signal output terminal of the multi-parameter water quality sensing module, respectively. Two ultrasonic transducers are installed on the side wall of the pre-desalination treatment chamber 1 and the side wall of the deep polishing treatment chamber 2, respectively.

[0069] After the device in this embodiment is put into operation, no chemical reagents need to be added throughout the entire process, and the water quality is kept stable as follows: The influent to the first-stage pre-desalination unit has the following characteristics: chloride ion concentration 32 mg / L, sulfate concentration 45 mg / L, and pH value 7.2. The effluent from the first-stage pre-desalination unit has the following characteristics: chloride ion concentration 0.75 mg / L, sulfate concentration 0.32 mg / L, pH value 7.1. The pre-desalination unit achieves a chloride ion removal rate of approximately 97.7% and a sulfate ion removal rate of approximately 99.3%. The effluent from the second-stage advanced treatment unit has a chloride ion concentration of 42 μg / L, a sulfate concentration of 18 μg / L, and a pH value of 7.4~7.6. The total removal rate of chloride ions from the two stages reaches 99.87%, and the removal rate of sulfate ions reaches 99.96%.

[0070] The effluent water quality fully meets the stringent control requirements of chloride ion ≤100μg / L, sulfate ≤50μg / L, and pH 7.0~8.3. After commissioning, the corrosion rate of the carbon steel heat exchange tubes decreased from 0.09mm / a to 0.018mm / a, a reduction of 80%, completely eliminating the risk of pitting corrosion and stress corrosion cracking. The unit can save approximately 3.4 million yuan in corrosion inhibitor costs annually, and the annual operating electricity cost is only about 120,000 yuan, demonstrating significant economic and safety advantages.

[0071] Example 2 This embodiment is a bypass purification device applicable to the indirect air-cooled circulating water system of a 660MW ultra-supercritical coal-fired power generation unit. Unlike Embodiment 1, this embodiment is designed for operating conditions with more stringent water quality control requirements, and sets the control targets as follows: chloride ion ≤80μg / L, sulfate ion ≤40μg / L, and pH value 7.2~7.8.

[0072] The device in this embodiment employs three parallel two-stage treatment systems. Each system is equipped with the same pressurized chamber assembly, a two-stage deep anion removal core module, and an independent multi-parameter water quality sensing module. The three systems operate in parallel, with a total treatment capacity of 400 m³. 3 / h. A single system's pre-desalination unit is configured with 50 arrayed compartment units, and the total effective area of ​​the homogeneous anion-selective exchange membrane is 200m². 2 The deep processing unit is equipped with 40 arrayed compartment units, and the total effective area of ​​the homogeneous anion-selective exchange membrane and bipolar membrane is 160m². 2 The compartments are filled with high-exchange-capacity gel-type anion exchange resin. Each system is connected in parallel to the circulating water bypass pipeline via a main pipe. An electric butterfly valve at the inlet allows for independent switching, and the outlets are connected to the main outlet pipeline with an online sampling port. Each system's pre-desalination unit is equipped with a high-frequency regulated DC electrolysis power supply (0~60V / 350A), while the deep treatment unit is equipped with a low-ripple, high-precision DC electrolysis power supply (0~30V / 120A). The freshwater circulation unit is equipped with three variable-frequency stainless steel booster centrifugal pumps, each with a rated flow rate of 200 m³ / h. 3 / h, two for use and one for standby; the concentrate circulation unit is equipped with an independent concentrate tank and matching circulation pump, drain valve and water supply valve. The deep treatment concentrate outlet is connected to the pre-desalination unit inlet through the return pipeline to realize the cascade utilization of concentrate.

[0073] In the multi-parameter water quality sensing module, the signal output terminals of each sensor group are connected to the data input terminals of the central industrial control module 8. The central industrial control module 8 adopts a redundant configuration, supporting dual-machine hot standby. The main control module and the backup module synchronize operating data in real time via a high-speed synchronous bus. When the main control module fails, the backup module can complete a seamless switchover within 50ms, effectively ensuring the stability of the device's long-term continuous operation. The central industrial control module 8 incorporates a two-stage coupled fuzzy PID control algorithm and is equipped with a Profinet industrial Ethernet interface and a Modbus TCP / IP communication interface, enabling full data interface with the power plant's DCS and SIS systems, integrating into the power plant's overall automation control system for unattended operation. The membrane fouling status assessment unit collects key characterization parameters in real time from the two-stage units, such as electrolyzer pressure, pressure difference across the membrane module, and anion removal rate. Two ultrasonic transducers are respectively installed on the side walls of each pre-desalination treatment chamber 1 and each deep polishing treatment chamber 2.

[0074] After the device in this embodiment is put into operation, at 400m 3 Under the condition of treating a water volume of / h, the water quality stability control throughout the entire process is as follows: The influent to the first-stage pre-desalination unit has the following characteristics: chloride ion concentration 28~38 mg / L, sulfate concentration 38~52 mg / L, and pH value 7.0~7.5. The effluent from the first-stage pre-desalination unit has the following characteristics: chloride ion concentration 0.5~0.8 mg / L, sulfate concentration 0.2~0.4 mg / L, and pH value 7.0~7.3. The effluent from the second-stage advanced treatment unit has a stable chloride ion concentration of 35~60μg / L, a stable sulfate concentration of 12~28μg / L, and a stable pH value of 7.3~7.7.

[0075] The effluent water quality fully meets the stringent water quality control requirements of chloride ion ≤80μg / L, sulfate ion ≤40μg / L, and pH 7.2~7.8. The corrosion rate of carbon steel pipelines is stably controlled at ≤0.02mm / a, far exceeding the national standard limit, completely eliminating the risk of pitting corrosion, crevice corrosion, and stress corrosion cracking caused by corrosive anions to carbon steel pipelines and heat exchange equipment. It can save approximately 4.5 million yuan annually in corrosion inhibitor and chemical cleaning agent costs, and the annual operating electricity cost is only about 220,000 yuan, demonstrating significant economic and safety benefits.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An ion purification device, characterized in that, include: A pressure-bearing cavity assembly, the pressure-bearing cavity assembly comprising a pre-desalted treatment cavity (1) and a deep polishing treatment cavity (2). A two-stage deep anion removal core module, comprising a first-stage anion electrodialysis pre-desalination unit (3) and a second-stage polishing type electro-deionization treatment unit (4); the first-stage anion electrodialysis pre-desalination unit (3) is installed inside the pre-desalination treatment chamber (1), and the second-stage polishing type electro-deionization treatment unit (4) is installed inside the deep polishing treatment chamber (2); the outlet of the first-stage anion electrodialysis pre-desalination unit (3) is connected to the inlet of the second-stage polishing type electro-deionization treatment unit (4); A multi-parameter water quality sensing module, comprising a first sensor group (5), a second sensor group (6), and a third sensor group (7); the first sensor group (5) is installed at the inlet of the first-stage anion electrodialysis pre-desalination unit (3), the second sensor group (6) is installed at the outlet of the first-stage anion electrodialysis pre-desalination unit (3), and the third sensor group (7) is installed at the outlet of the second-stage polishing type electro-deionization treatment unit (4); The central industrial control module (8) has its signal input terminals connected to the signal output terminals of the first sensor group (5), the second sensor group (6), and the third sensor group (7), respectively. The control signal output terminals of the central industrial control module (8) are electrically connected to the first-stage anion electrodialysis pre-desalination unit (3) and the second-stage polishing electrodeionization treatment unit (4), respectively.

2. The ion purification device according to claim 1, characterized in that, The first-stage anion electrodialysis pre-desalination unit (3) includes a DC electrolysis power supply, a pre-desalination compartment unit, and an inert electrode assembly; the pre-desalination compartment unit is disposed inside the pre-desalination treatment chamber (1), and the pre-desalination compartment unit is composed of multiple sets of homogeneous anion selective exchange membranes and cation exchange membranes arranged alternately; the pre-desalination treatment chamber (1) has electrode chambers at both ends inside, and the inert electrode assembly is disposed in the electrode chamber; the DC electrolysis power supply is disposed outside the pre-desalination treatment chamber (1), and the inert electrode assembly is electrically connected to the positive and negative electrodes of the DC electrolysis power supply respectively.

3. The ion purification device according to claim 2, characterized in that, The inert electrode assembly is a titanium-based platinum-plated electrode.

4. The ion purification device according to claim 1, characterized in that, The second-stage polishing-type electrodeionization treatment unit (4) includes a DC electrolysis power supply, an array-type deep polishing chamber unit, and a bipolar membrane assembly. The array-type deep polishing chamber unit is disposed inside the deep polishing treatment cavity (2). The array-type deep polishing chamber unit is composed of multiple sets of alternating homogeneous anion selective exchange membranes and bipolar membranes. Ion exchange resin is filled between adjacent homogeneous anion selective exchange membranes and bipolar membranes. The bipolar membrane assembly is disposed inside the deep polishing treatment cavity (2). The DC electrolysis power supply is disposed outside the deep polishing treatment cavity (2). The DC electrolysis power supply is electrically connected to the array-type deep polishing chamber unit and the bipolar membrane assembly, respectively.

5. An ion purification device according to claim 4, characterized in that, The ion exchange resin is a gel-type anion exchange resin.

6. The ion purification device according to claim 1, characterized in that, The central industrial control module (8) includes a main control chip, a programmable logic controller, a data processing unit, a control algorithm unit, a fault diagnosis and interlock protection unit, and an industrial network communication unit. The main control chip is connected to the programmable logic controller; the data processing unit, the control algorithm unit, the fault diagnosis and interlocking protection unit, and the industrial network communication unit are respectively connected to the main control chip; the signal input terminal of the data processing unit is connected to the signal output terminal of the multi-parameter water quality sensing module; the signal output terminal of the control algorithm unit is electrically connected to the control signal input terminals of the first-stage anion electrodialysis pre-desalination unit (3) and the second-stage polishing electro-deionization treatment unit (4); the signal input terminal of the fault diagnosis and interlocking protection unit is respectively connected to the voltage detection of the first-stage anion electrodialysis pre-desalination unit (3). The voltage detection terminal of the second-stage polishing electro-deionization treatment unit (4), the differential pressure detection terminal of the pre-desalination treatment chamber (1), the differential pressure detection terminal of the deep polishing treatment chamber (2), and the signal output terminal of the multi-parameter water quality sensing module are connected to the control signal input terminal of the first-stage anion electrodialysis pre-desalination unit (3), the control signal input terminal of the second-stage polishing electro-deionization treatment unit (4), and the control signal input terminal of the circulating water pipeline module, respectively. The industrial network communication unit is connected to the power plant DCS system and SIS system through the industrial communication interface, respectively.

7. The ion purification device according to claim 1, characterized in that, The first sensor group (5), the second sensor group (6) and the third sensor group (7) each include an ion chromatograph, a pH sensor, a conductivity sensor, a redox potential sensor, a temperature sensor and a flow sensor; the signal output terminals of each sensor are connected to the data input terminal of the central industrial control module (8).

8. An ion purification device according to claim 1, characterized in that, It also includes a circulating water pipeline module, which includes a freshwater circulation unit and a concentrated water circulation unit; The freshwater circulation unit includes a booster centrifugal pump (9), a flow regulating valve (11), a check valve (10), and a manual maintenance valve (12). The outlet of the booster centrifugal pump (9) is connected to the inlet of the flow regulating valve (11), and the outlet of the flow regulating valve (11) is connected to the inlet of the pre-desalination treatment chamber (1). The check valve (10) and the manual maintenance valve (12) are installed sequentially between the booster centrifugal pump (9) and the pre-desalination treatment chamber (1). The concentrate circulation unit includes a pre-desalination concentrate system and a deep treatment concentrate system. The pre-desalination concentrate system includes a first concentrate tank (13), a first concentrate circulation pump (14), a first drain valve (15), and a first water supply valve (16). The outlet of the first concentrate tank (13) is connected to the inlet of the first concentrate circulation pump (14). The drain outlet of the first concentrate tank (13) is connected to the inlet of the first drain valve (15). The first water supply valve (16) is installed between the water supply outlet of the first concentrate tank (13) and the outlet of the pre-desalination treatment chamber (1). The outlet of the first concentrate circulation pump (14) is connected to the concentrate inlet of the pre-desalination treatment chamber (1). The deep treatment concentrate system includes a second concentrate tank (17), a second concentrate circulation pump (18), a second drain valve (19), and a second water supply valve (20). The outlet of the second concentrate tank (17) is connected to the inlet of the second concentrate circulation pump (18). The drain outlet of the second concentrate tank (17) is connected to the inlet of the second drain valve (19). The second water supply valve (20) is installed between the water supply outlet of the second concentrate tank (17) and the outlet of the deep polishing treatment chamber (2). The outlet of the second concentrate circulation pump (18) is connected to the concentrate inlet of the deep polishing treatment chamber (2). The concentrate outlet of the deep polishing treatment chamber (2) is connected to the inlet of the pre-desalination treatment chamber (1) through a return pipeline.

9. An ion purification device according to claim 1, characterized in that, It also includes an automatic online cleaning and regeneration module for membrane modules, which includes an ultrasonic cleaning unit, an online cleaning unit, and a membrane fouling status assessment unit. The ultrasonic cleaning unit includes two ultrasonic transducers, which are respectively installed on the side wall of the pre-desalination treatment chamber (1) and the side wall of the deep polishing treatment chamber (2); the online cleaning unit is connected to the pre-desalination treatment chamber (1) and the deep polishing treatment chamber (2); the signal input terminal of the membrane fouling status assessment unit is connected to the voltage detection terminal of the first-stage anion electrodialysis pre-desalination unit (3), the voltage detection terminal of the second-stage polishing type electrodeionization treatment unit (4), the differential pressure detection terminal of the pre-desalination treatment chamber (1), the differential pressure detection terminal of the deep polishing treatment chamber (2), and the signal output terminal of the multi-parameter water quality sensing module; the control signal output terminal of the membrane fouling status assessment unit is electrically connected to the control signal input terminal of the ultrasonic cleaning unit and the control signal input terminal of the online cleaning unit.

10. A method of using an ion purification device according to any one of claims 1 to 9, characterized in that, Includes the following steps: The circulating water flows sequentially through the pre-desalination treatment chamber (1) and the deep polishing treatment chamber (2). The first sensor group (5) collects the water quality parameters at the inlet of the pre-desalination treatment chamber (1), the second sensor group (6) collects the water quality parameters at the outlet of the pre-desalination treatment chamber (1), and the third sensor group (7) collects the water quality parameters at the outlet of the deep polishing treatment chamber (2). The central industrial control module (8) receives the collected water quality parameters and controls the operation status of the first-stage anion electrodialysis pre-desalination unit (3) and the second-stage polishing electro-deionization treatment unit (4) according to the water quality parameters.

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