Apparatus and system for electroregenerating spent ion exchange resin

Abstract

The application discloses a device and system for electrically regenerating exhausted ion exchange resin, which comprises a membrane stack, cathode and anode zone assemblies on both sides of the membrane stack, and a fastening mechanism for compactly fixing the membrane stack and the zone assemblies. The membrane stack is arranged in the order of anode membrane, resin frame plate, cathode membrane, and concentrated water partition plate from the end of the cathode zone assembly to the end of the anode zone assembly, and finally ends with anode membrane, resin frame plate, and cathode membrane; the middle area of the resin frame plate is provided with a plurality of cavities penetrating through the front and back surfaces and parallel to each other, and the cavities and the membranes on both sides form regeneration chambers, and the non-penetrating areas between adjacent regeneration chambers are used as support strips; resin inlet and outlet flow channels and fresh water inlet and outlet flow channels are independently arranged in each regeneration chamber of the resin frame plate, and the resin inlet and outlet flow channels and the fresh water inlet and outlet flow channels are independent of each other. The system comprises two or more than two devices and auxiliary facilities arranged in parallel. The device is convenient for large-scale production and does not need to be disassembled during the process of loading and discharging resin.

Description

Technical Field

[0001] This invention relates to the field of ion exchange resin regeneration technology, and specifically to an apparatus and system for electro-regenerating failed ion exchange resins. Background Technology

[0002] In the field of power plant condensate treatment, high-speed mixed bed resins are currently the mainstream fine treatment equipment, typically located in turbine buildings and operating at high pressures. When existing high-speed mixed beds fail, the resin is mostly regenerated off-site. The specific process is as follows: the failed resin is first transported to a dedicated regeneration area via fluid, where it is separated into anion and cation resins by a separation tower. The upper anion resin is sent to an anion resin regeneration unit, and the lower cation resin is sent to a cation resin regeneration unit for regeneration. During the regeneration process, acid is added to the cation resin regeneration unit and alkali is added to the anion resin regeneration unit. After regeneration, the resin needs to be cleaned, and finally, the regenerated qualified resin is returned to the high-speed mixed bed for reuse.

[0003] While chemical regeneration can effectively regenerate spent resins, it has significant drawbacks: First, the operation process is cumbersome, involving multiple steps such as separating cation and anion resins, regenerating them separately, and cleaning, which is time-consuming and has high maintenance costs; second, it relies on acid and alkali chemical agents, which generate a large amount of acid and alkali wastewater during the regeneration process, not only facing environmental emission pressure, but also incurring extremely high wastewater treatment costs to meet current zero-discharge requirements; third, the procurement, storage, and addition of acid and alkali agents further increase operating costs and the difficulty of safety management, making it difficult to meet the dual requirements of environmental protection and cost reduction.

[0004] Therefore, there is an urgent need for a resin regeneration technology that does not rely on chemical reagents, has a simplified process, and is environmentally friendly, in order to solve the pain points of existing high-speed mixed bed resin chemical regeneration, such as environmental problems, cumbersome operation, and high operating costs.

[0005] Chinese invention patent CN101880074A discloses a countercurrent-operated plate-and-frame type electroregeneration device for failed ion exchange resin, comprising a membrane stack, electrode devices, and a clamping device. The membrane stack consists of several sets of membrane pairs, each set including a cation exchange membrane, a resin regeneration chamber partition, an anion exchange membrane, and a concentrate chamber partition. Electrode devices are arranged on both sides of the membrane stack, and the membrane stack and electrode devices are clamped together by the external clamping device to assemble the plate-and-frame type ion exchange resin electroregeneration device. However, this device requires disassembly (requiring the removal and installation of its resin inlet sealing plug) when filling and discharging resin, and it is not conducive to large-scale development. In addition, the device adopts countercurrent operation of concentrate and desalination during the electroregeneration process, resulting in opposite pressure change trends in the concentrate chamber and the resin chamber, thus causing a large pressure difference across the membrane and easily leading to severe membrane indentation. Summary of the Invention

[0006] In order to overcome the problems existing in the prior art, the present invention provides an apparatus and system for electro-regenerating failed ion exchange resin. The apparatus uses water flow to carry the resin to be regenerated into the regeneration device and to discharge the regenerated resin from the regeneration device. The apparatus does not need to be disassembled when filling or discharging the resin, and the apparatus is easy to scale up.

[0007] An apparatus for electro-regenerating failed ion exchange resin includes a membrane stack, a cathode region assembly and an anode region assembly located on both sides of the membrane stack, and a fastening mechanism for pressing and fixing the cathode region assembly, the membrane stack, and the anode region assembly. The membrane stack is arranged sequentially from the cathode region assembly side to the anode region assembly side, with a cation membrane, a resin frame plate, an anion membrane, and a concentrate separator as basic units, and then ends with a cation membrane, a resin frame plate, and an anion membrane in sequence. The central region of the resin frame plate has several vertically parallel cavities that penetrate the central region on both the front and back sides. The cavities, together with a pair of anion membranes and a cation membranes closely attached to both sides of the resin frame plate, form several regeneration chambers for resin regeneration. The non-penetrating areas between adjacent regeneration chambers serve as support strips. Each regeneration chamber in the resin frame plate has its own independent resin inlet and outlet channels and freshwater inlet and outlet channels, and the resin inlet and outlet channels and freshwater inlet and outlet channels are independent of each other.

[0008] The resin plate frame is equipped with several independent regeneration chambers, which facilitates the scaling up of the device; the resin flow channel and the fresh water flow channel are independent of each other and do not affect each other, so there is no need to disassemble the device when filling and discharging resin.

[0009] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0010] Optionally, the thickness of the resin frame plate is 5-50mm; the height and width of the regeneration chamber are 300-2000mm and 30-250mm respectively; and the width of the support strip between adjacent regeneration chambers is 2-50mm.

[0011] Optionally, each regeneration chamber of the resin frame plate is provided with first upper and lower resin through holes, first upper and lower fresh water through holes, and first upper and lower concentrate through holes vertically penetrating the resin frame plate. Each first upper resin through hole is connected to the top of each regeneration chamber through an upper resin channel, and each first lower resin through hole is connected to the bottom of each regeneration chamber through a lower resin channel. The top and bottom of each regeneration chamber are also provided with upper and lower fine slits for resin interception. The upper fine slits are connected to the corresponding first upper fresh water through holes through upper fresh water channels, and the lower fine slits are connected to the corresponding first lower fresh water through holes through lower fresh water channels. The upper resin channels and upper fresh water channels are arranged parallel to each other and are not directly connected, and the lower resin channels and lower fresh water channels are arranged parallel to each other and are not directly connected. The upper resin channels, lower resin channels, upper fresh water channels, and lower fresh water channels are all closed-hole channels to prevent the anion and cation membranes from sinking into the channels, causing internal leakage of the device and affecting the regeneration efficiency.

[0012] Optionally, the concentrate baffle is a plate-frame structure, with a mesh in the middle area; the thickness of the concentrate baffle is 0.5-3.0mm; the upper and lower edges of the plate-frame structure are respectively provided with through holes corresponding to the resin frame plate, including second upper and lower resin through holes, second upper and lower distillate through holes, and second upper and lower concentrate through holes; the top and bottom of the mesh are directly connected to the second upper and lower concentrate through holes of the concentrate baffle.

[0013] Optionally, both the anion membrane and the cation membrane are provided with through holes that correspond one-to-one with the resin frame plate and the concentrate baffle. After the cation membrane, the resin frame plate, the anion membrane and the concentrate baffle are tightly connected according to the arrangement rules, all the corresponding through holes respectively form the upper and lower resin channels, the upper and lower desalination channels and the upper and lower concentrate channels inside the membrane stack.

[0014] Optionally, the cathode assembly includes a mesh cathode, cathode terminals, and a cathode end plate; the anode assembly includes a mesh anode, anode terminals, and an anode end plate; the cathode and anode end plates facing the membrane stack are respectively provided with sized matching cathode and anode mounting grooves; the upper and lower ends of the cathode and anode mounting grooves are respectively provided with horizontal upper and lower cathode area water distribution grooves and horizontal upper and lower anode area water distribution grooves; a plurality of parallel vertical grooves for the cathode area and vertical grooves for the anode area are respectively provided between the upper and lower cathode area water distribution grooves and between the upper and lower anode area water distribution grooves; the mesh cathode fixed in the cathode mounting groove is in close contact with the anode membrane, and the mesh anode fixed in the anode mounting groove is in close contact with the cathode membrane.

[0015] The cathode and anode terminals are used for electrical connection to the negative and positive terminals of the power supply, respectively, and are sealed to the cathode and anode end plates. Vertical grooves in the cathode and anode areas facilitate the smooth flow of water, hydrogen, and oxygen bubbles generated on the cathode and anode. Optionally, seven types of interfaces are integrated on the cathode and anode end plates, including an upper resin interface, a lower resin interface, an upper freshwater interface, a lower freshwater interface, an upper concentrate interface, a lower concentrate interface, and an anode electrode water discharge interface. These seven types of interfaces may be centrally located on the same end plate or distributed across different end plates. The upper concentrate interface connects to the upper cathode area water distribution tank and the upper concentrate channel within the membrane stack via a channel within the corresponding end plate. The lower concentrate interface connects to the lower cathode area water distribution tank, the lower anode area water distribution tank, and the lower concentrate channel within the membrane stack via a channel within the corresponding end plate. The anode electrode water discharge interface connects to the upper anode area water distribution tank via a channel within the corresponding end plate. The remaining interfaces connect to the upper and lower resin channels and the upper and lower freshwater channels within the membrane stack via corresponding channels within their respective end plates.

[0016] An optional clamping and fixing scheme, wherein the fastening mechanism includes a pair of clamps and a bolt assembly, wherein the clamps have reinforcing ribs and bolt holes are provided around their perimeter.

[0017] Another optional clamping and fixing scheme includes a clamping mechanism comprising a first fixed frame, a sliding frame, a second fixed frame, and a crossbeam connecting the first fixed frame and the second fixed frame, all vertically arranged in sequence; the sliding frame and the crossbeam are slidably engaged, the membrane stack is clamped between the first fixed frame and the sliding frame, a hydraulic press and a limiting member are provided between the sliding frame and the second fixed frame, the sliding frame is driven by the hydraulic press to slide along the crossbeam to press the membrane stack and is limited by the limiting member.

[0018] Optionally, a crossbar connecting the first fixing frame and the second fixing frame is also provided.

[0019] Optionally, the crossbars and crossbeams are each symmetrically arranged as a pair.

[0020] Optionally, a slide rail is provided on the crossbeam, and a pulley is provided on the sliding frame. The sliding frame achieves sliding engagement with the slide rail through the pulley.

[0021] Optionally, the limiting member includes four.

[0022] Optionally, the limiting component includes a limiting screw and a limiting nut.

[0023] Furthermore, the fastening mechanism includes a first fixed frame with supporting feet, a sliding frame with pulleys, a second fixed frame with supporting feet, a pair of crossbeams and a pair of crossbars fixedly connecting the first and second fixed frames, a pair of slide rails fixedly installed on the top of the crossbeams, a hydraulic press, and four limiting members; each of the two vertical sides of the sliding frame has a pulley fixing member for fixing the pulley below it; the cathode and anode end plates in the cathode and anode area assembly, and the resin frame plate and concentrate separator in the membrane stack, are each provided with a pair of supports for placement; the cathode and anode area assembly, the membrane stack, and the sliding frame are supported on the slide rails together through the pairs of supports and pulleys; the piston rod end and cylinder of the hydraulic press are respectively provided with a first flange and a second flange; the limiting member includes a third flange, a limiting screw, and a limiting nut, one end of the limiting screw is fixedly connected to the third flange, and the other end of the limiting screw is equipped with the limiting nut; the sliding frame faces towards A first support plate is provided on one side of the second fixed frame. The first support plate has bolt through holes adapted to the first and third flanges and is fixedly connected to the first and third flanges by bolts. A second support plate is provided on the side of the second fixed frame facing the sliding frame. The second support plate has bolt through holes adapted to the second flange and is fixedly connected to the second flange by bolts. The second support plate also has through holes for the limit screw to move in and out flexibly and to effectively block the limit nut. The hydraulic press is used to temporarily press the first fixed frame, the cathode and anode components, the membrane stack and the sliding frame. After pressing in place, the nut on the limit screw is turned so that the nut abuts against the second fixed frame to form an axial rigid limit support. After the limit support is in place, the hydraulic press can be depressurized, and the limit component restricts the sliding frame from springing back, so that the first fixed frame, the cathode and anode components, the membrane stack and the sliding frame remain in a pressed state even when the hydraulic press is depressurized.

[0024] The resin plate frame, concentrated water baffle, cathode end plate and anode end plate are all made of insulating material.

[0025] This application also provides a system for electro-regenerating failed ion exchange resin, characterized in that the system includes two or more of the aforementioned devices arranged in parallel, as well as external auxiliary facilities consisting of pipelines, concentrate pumps, desalination pumps, resin transfer pumps, valves, resin storage tanks, resin transfer tanks, concentrate tanks, desalination tanks, and control boxes, wherein the resin storage tanks include a resin storage tank to be regenerated and a regenerated resin storage tank.

[0026] Optionally, the resin storage tank to be regenerated is connected to the upper resin interface of each of the parallel resin regeneration devices through pipelines equipped with valves, the lower resin interface of each resin regeneration device is connected to the resin transfer tank through pipelines equipped with valves, the resin transfer tank is connected to the top inlet of the regenerated resin storage tank through pipelines and a resin delivery pump, and the bottom outlet of the regenerated resin storage tank is connected to a pipeline equipped with valves.

[0027] Optionally, the concentrate tank is connected to the upper and lower concentrate interfaces of each resin regeneration device via a concentrate pump and pipelines, with valves installed on each pipeline. Similarly, the desalination tank is connected to the upper and lower desalination interfaces of each resin regeneration device via a desalination pump and pipelines, with valves installed on each pipeline. During electroregeneration and the filling of the regeneration chamber or the discharge of resin from the regeneration chamber, water with low impurity ion content is required, typically with a conductivity less than 0.5 μS / cm. Furthermore, during electroregeneration, water must be continuously supplied to the cathode, anode, and concentrate isolation areas. The influent water quality requirements are essentially the same: sufficient conductivity to reduce ohmic voltage drop, but without excessive impurity ions to avoid affecting the electroregeneration efficiency of the resin due to back diffusion. A suitable conductivity is approximately 200-2000 μS / cm. For ease of description, the first type of low-conductivity water will be referred to as desalination water, and the second type of water with relatively high conductivity will be referred to as concentrate water.

[0028] Given that the water quality requirements for the influent to the cathode and anode zones and the concentrate filter zone are basically the same during the electroregeneration process, the three types of influent can be supplied by the same external pipeline to simplify piping and other supporting facilities. In the corresponding effluent, the anode water may contain oxidizing hypochlorite electrolysis byproducts, requiring separate diversion and final discharge from the anode water discharge port. The other two effluents, including the cathode zone effluent and the concentrate filter zone effluent, can be combined and ultimately discharged from the upper concentrate port.

[0029] Compared with the prior art, this application has at least one of the following beneficial effects: (1) The resin plate frame of this application is provided with multiple independent regeneration chambers, which is conducive to the large-scale application of the device.

[0030] (2) The resin plate frame of this application is provided with resin inlet and resin outlet respectively, and the fresh water channel and resin channel are independent of each other. When filling and discharging the resin, the resin to be regenerated is filled into the regeneration device and the regenerated resin is discharged from the regeneration device by water flow carrying the resin, without disassembling the regeneration device.

[0031] (3) The concentrated water inlet and outlet through holes on the concentrated water baffle of this application are connected to the concentrated water inlet and outlet interfaces on the end plate. Only one concentrated water inlet and outlet interface is required for the device to be connected to the external pipeline, which simplifies the device pipeline. (4) In the electro-regeneration process of the device of this application, both fresh water and concentrated water flow from bottom to top in the same direction. Whether it is the resin chamber of the resin plate frame or the mesh area of ​​the concentrated water partition, the water pressure gradually decreases from bottom to top. The pressure difference on both sides of the membrane is small, and the degree of indentation caused by the pressure difference on both sides is small, so the device has good stability.

[0032] (5) Regeneration does not require acid or alkali reagents, which saves reagent costs and reduces pollutant emissions; at the same time, it saves more than 50% of demineralized water, significantly reducing water consumption and water expenses.

[0033] (6) The cation and cation mixed resin can be directly regenerated without separation and cleaning, greatly simplifying the process and enabling fully automatic operation. Attached Figure Description

[0034] Figure 1 This is a front view of the device described in this application.

[0035] Figure 2 This is a top view of the device described in this application.

[0036] Figure 3 This is a left view of the device described in this application.

[0037] Figure 4 This is a structural diagram of the resin frame plate of the device in this application.

[0038] Figure 5 This is a structural diagram of the concentrate baffle of this device.

[0039] Figure 6 This is a structural diagram of the cathode region assembly of the device in this application.

[0040] Figure 7 This is a structural diagram of the anode region assembly of the device in this application.

[0041] Figure 8 This is a schematic diagram of the system in this application.

[0042] Figure 9 for Figure 8 The process flow diagram for the resin state of the system shown is illustrated.

[0043] Figure 10 for Figure 8 The diagram shows the process flow chart for the electro-regeneration of resin in the system shown.

[0044] Figure 11 for Figure 8 The diagram shows the process flow chart for resin discharge in the system shown.

[0045] The reference numerals in the figure are as follows: 1. Membrane stack; 2. Positive membrane; 3. Resin frame plate: 301. Regeneration chamber, 302. Support strip, 303. First upper resin through hole, 304. First upper fresh water through hole, 305. First upper concentrated water through hole, 306. First lower resin through hole, 307. First lower fresh water through hole, 308. First lower concentrated water through hole, 309. Upper resin flow channel, 310. Lower resin flow channel, 311. Upper fresh water flow channel, 312. Lower fresh water flow channel, 313. Upper slit strip, 314. Lower slit strip, 315. Resin frame plate support lug; 4. Vaginal membrane; 5. Concentrate baffle: 501. Concentrate baffle mesh, 502. Second upper resin through hole, 503. Second upper desalination through hole, 504. Second upper concentrate through hole, 505. Second lower resin through hole, 506. Second lower desalination through hole, 507. Second lower concentrate through hole, 508. Concentrate baffle support lug. 6. Cathode Area Assembly: 601. Mesh Cathode, 602. Cathode Terminal Block, 603. Cathode End Plate, 604. Cathode Mounting Slot, 605. Upper Water Distribution Slot in Cathode Area, 606. Lower Water Distribution Slot in Cathode Area, 607. Vertical Groove in Cathode Area, 608. Upper Resin Interface, 609. Lower Resin Interface, 610. Upper Concentrate Interface, 611. Lower Concentrate Interface, 612. Upper Resin Main Channel, 613. Lower Resin Main Channel, 614. Upper Resin Branch Channel, 615. Lower Resin Branch Channel, 616. Upper Concentrate Main Channel, 617. Lower Concentrate Main Channel, 618. Upper Concentrate Branch Channel, 619. Lower Concentrate Branch Channel, 620. Upper Cathode Water Flow Channel, 621. Lower Cathode Water Flow Channel, 622. Cathode End Plate Support Lug; 7. Anode Area Components: 701. Mesh Anode, 702. Anode Terminal Block, 703. Anode End Plate, 704. Anode Mounting Slot, 705. Upper Anode Water Distribution Slot, 706. Lower Anode Water Distribution Slot, 707. Vertical Recess in Anode Area, 708. Upper Freshwater Interface, 709. Lower Freshwater Interface, 710. Anode Electrode Water Discharge Interface; 711. Upper Freshwater Main Channel, 712. Lower Freshwater Main Channel, 713. Upper Freshwater Branch Channel, 714. Lower Freshwater Branch Channel, 715. Concentrate Blind Hole, 716. Lower Anode Electrode Water Flow Channel, 717. Anode End Plate Support Lug; 8. Fastening mechanism: 801. First fixed frame, 801A. First support foot, 802. Sliding frame, 802A. Pulley, 802B. Pulley fixing component, 802C. First support plate, 803. Second fixed frame, 803A. Second support foot, 803B. Second support plate, 804. Crossbeam, 805. Crossbar, 806. Slide rail, 807. Hydraulic press, 807A. First flange, 807B. Second flange, 807C. Cylinder, 807D. Piston rod, 808. Limiting component, 808A. Third flange, 808B. Limiting screw, 808C. Limiting nut; 9. Regeneration System: 901. First Resin Regeneration Unit; 902. Second Resin Regeneration Unit; 903. Resin Transfer Tank; 904. Regenerated Resin Storage Tank; 905. Resin Storage Tank to be Regenerated; 906. Concentrate Tank; 907. Desalinate Water Tank; 908. Inlet Valve of Resin Transfer Tank; 909. Outlet Valve of Regenerated Resin Storage Tank; 910. Outlet Valve of Resin Storage Tank to be Regenerated; 911. Upper Desalinate Water Interface Discharge Valve; 912. Upper Desalinate Water Interface Inlet Valve 913. Lower freshwater inlet valve; 914. Upper / lower freshwater main drain valve; 915. Upper freshwater outlet valve; 916. Lower freshwater outlet valve; 917. Lower concentrate inlet valve; 918. Lower concentrate outlet valve; 919. Freshwater tank make-up valve; 920. Upper concentrate outlet valve; 921. Concentrate pump; 922. Freshwater pump; 923. Resin transfer pump; 924. Concentrate overflow port; 925. Freshwater overflow port. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] To better describe and illustrate the embodiments of this application, reference may be made to one or more accompanying drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the inventive creations of this application, the embodiments or preferred methods described herein.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0049] like Figure 1 and Figure 2 As shown, an apparatus for electro-regenerating failed ion exchange resin includes a membrane stack 1, a cathode region assembly 6 and an anode region assembly 7 located on both sides of the membrane stack 1, and a fastening mechanism 8 for pressing and fixing the cathode and anode region assemblies and the membrane stack 1.

[0050] See Figure 1The membrane stack 1 is arranged in a repeating manner from the cathode module 6 side to the anode module 7 side, with the cation membrane 2, resin frame plate 3, anion membrane 4 and concentrate baffle 5 as basic units. Then, it ends with the cation membrane 2, resin frame plate 3 and anion membrane 4 in sequence. That is, the membrane stack 1 that is in contact with the cathode module 6 is the cation membrane 2, and the membrane that is in contact with the anode module 7 is the anion membrane 4. Both sides of the membrane stack 1 are connected to the corresponding cathode and anode modules by membranes.

[0051] The resin frame plate 3 is a plate-frame structure made of insulating material. It contains several independent regeneration chambers 301. As one embodiment of the regeneration chambers, the central region of the resin frame plate 3 has several vertically parallel cavities that penetrate the central region on both the front and back sides. The front and back sides refer to the plate surfaces facing the anion and cation membranes on both sides, respectively. The cavities, together with a pair of anion and cation membranes closely attached to both sides of the resin frame plate, form several regeneration chambers 301 for resin regeneration. The non-penetrating areas between adjacent regeneration chambers serve as support strips 302 to prevent the anion and cation membranes from sinking into the regeneration chambers 301, thus avoiding affecting the resin filling and regeneration effect. The resin frame plate 3 has multiple regeneration chambers internally, separated by support strips, facilitating the scaling up of the device. Each regeneration chamber is independently equipped with resin inlet and outlet channels and fresh water inlet and outlet channels. The resin inlet and outlet channels and fresh water inlet and outlet channels are independent of each other. The resin is loaded and discharged through the resin inlet and outlet channels of the corresponding regeneration chamber under the entrainment of the water flow. Therefore, the device does not need to be disassembled when loading and discharging resin.

[0052] In one specific implementation, its structure is as follows: Figure 4As shown, the thickness of the resin frame plate 3 is 5-50mm; the height h and width d1 of the regeneration chamber 301 are 300-2000mm and 30-250mm respectively; the width d2 of the support strip 302 between adjacent regeneration chambers is 2-50mm. Each regeneration chamber 301 of the resin frame plate 3 has a first upper resin through-hole 303, a first upper freshwater through-hole 304, and a first upper concentrate through-hole 305 independently provided above it; and each regeneration chamber 301 has a first lower resin through-hole 306, a first lower freshwater through-hole 307, and a first lower concentrate through-hole 308 independently provided below it. All through-holes vertically penetrate the edge of the resin frame plate. Each first upper resin through-hole 303 is connected to the top of each regeneration chamber 301 via an upper resin flow channel 309, and each first lower resin through-hole 306 is connected to the bottom of each regeneration chamber 301 via a lower resin flow channel 310. Each regeneration chamber 301 is also equipped with an upper fine slit strip 313 and a lower fine slit strip 314 at its top and bottom for resin retention. The upper fine slit strip 313 is connected to the corresponding first upper fresh water through hole 304 by an upper fresh water channel 311, and the lower fine slit strip 314 is connected to the corresponding first lower fresh water through hole 307 by a lower fresh water channel 312. The upper resin channel 309 and the upper fresh water channel 311 are arranged parallel to each other and are not directly connected. Similarly, the lower resin channel 310 and the lower fresh water channel 312 are also arranged parallel to each other and are not directly connected. The upper resin channel 309, the lower resin channel 310, the upper fresh water channel 311, and the lower fresh water channel 312 are all closed-hole channels to prevent the anion and cation membranes from sinking into the corresponding channels, causing internal leakage of the device and affecting the regeneration efficiency.

[0053] The concentrate baffle 5 is a plate-frame structure made of insulating material. Its central area is a mesh 501, where impurity ions in the resin electromigrate to the mesh area and are then discharged with the concentrate flow. In one specific embodiment, its structure is as follows: Figure 5 As shown, the thickness of the concentrate baffle 5 is 0.5-3.0 mm; the upper and lower edges of the concentrate frame plate are respectively provided with through holes corresponding to the through holes on the resin frame plate, including: a second upper resin through hole 502, a second upper distillate through hole 503, a second upper concentrate through hole 504, a second lower resin through hole 505, a second lower distillate through hole 506, and a second lower concentrate through hole 507. The top and bottom of the separator are directly connected to the second upper concentrate through hole 504 and the second lower concentrate through hole 507 of the concentrate baffle plate, respectively.

[0054] Both sides of the resin frame and both sides of the concentrate baffle are cation and anion membranes, respectively. Anion membrane 2 and cation membrane 4 each have through holes corresponding to the resin frame and concentrate baffle (not shown in the diagram). After the cation membrane 2, resin frame 3, anion membrane 4, and concentrate baffle 5 are tightly connected, all corresponding through holes form the upper and lower resin channels, upper and lower permeate channels, and upper and lower concentrate channels inside the membrane stack. Specifically, after the cation membrane, resin frame, anion membrane, concentrate frame, and anion membrane are arranged and tightly connected according to a rule, all upper resin through holes connect to form the upper resin channels inside the membrane stack, all lower resin through holes connect to form the lower resin channels inside the membrane stack, all upper permeate through holes connect to form the upper permeate channels inside the membrane stack, all lower permeate through holes connect to form the lower permeate channels inside the membrane stack, all upper concentrate through holes connect to form the upper concentrate channels inside the membrane stack, and all lower concentrate through holes connect to form the fine concentrate channels inside the membrane stack.

[0055] The structure of cathode region component 6 is as follows Figure 6 As shown, the device includes a mesh cathode 601, a cathode terminal block 602, and a cathode end plate 603. The cathode end plate 603 is made of insulating material. A cathode mounting groove 604 of appropriate size is provided on the surface of the cathode end plate facing the membrane stack 1 for mounting the mesh cathode. The upper and lower ends of the cathode mounting groove 604 are respectively provided with a horizontal upper cathode area water distribution groove 605 and a lower cathode area water distribution groove 606. Several parallel vertical cathode area grooves 607 are provided in the cathode mounting groove and between the upper cathode area water distribution groove 605 and the lower cathode area water distribution groove 606 to promote the smooth flow of cathode water and hydrogen bubbles generated on the cathode. The mesh cathode 601, fixed in the cathode mounting groove 604, is in close contact with the anolyte membrane 4. The cathode terminal block 602 is electrically connected to the mesh cathode 601. The cathode terminal block 602 passes through the cathode end plate and is sealed with the cathode end plate 603.

[0056] The structure of anode assembly 7 is as follows Figure 7 As shown, the device includes a mesh anode 701, an anode terminal block 702, and an anode end plate 703. The anode end plate 703 is made of insulating material. A matching anode mounting groove 704 is provided on the surface of the anode end plate facing the membrane stack 1 for mounting the mesh anode. The upper and lower ends of the anode mounting groove 704 are respectively provided with a horizontal upper anode area water distribution groove 705 and a lower anode area water distribution groove 706. Several parallel vertical anode area grooves 707 are provided within the anode mounting groove and between the upper and lower anode area water distribution grooves 705 and 706 to promote smooth flow of anode water and oxygen bubbles generated on the anode. The mesh anode 701, fixed within the anode mounting groove 704, is in close contact with the anion membrane 2. The anode terminal block 702 is electrically connected to the mesh anode 701. The anode terminal block 702 penetrates the anode end plate and is sealed to the anode end plate 703.

[0057] The cathode and anode end plates are equipped with seven types of interfaces, including upper resin interface, lower resin interface, upper freshwater interface, lower freshwater interface, upper concentrate interface, lower concentrate interface, and anode electrode water discharge interface. These seven types of interfaces are either concentrated on the same end plate or distributed on different end plates. The upper concentrate interface is connected to the upper water distribution tank in the cathode area and the upper concentrate channel in the membrane stack through relevant channels in the end plate. The lower concentrate interface is connected to the lower water distribution tank in the cathode area, the lower water distribution tank in the anode area, and the lower concentrate channel in the membrane stack through relevant channels in the end plate. The anode electrode water discharge interface is connected to the upper water distribution tank in the anode area through relevant channels in the end plate. The remaining interfaces are connected to the upper and lower resin channels and the upper and lower freshwater channels in the membrane stack through relevant channels in their respective end plates.

[0058] In one embodiment, the upper resin interface, lower resin interface, upper concentrate interface, and lower concentrate interface are disposed on the cathode end plate 603, and the upper desalination interface, lower desalination interface, and anode water discharge interface are disposed on the anode end plate 703. For details, see [link to relevant documentation]. Figure 1 , Figure 6 and Figure 7 The upper resin interface 608 and the upper concentrate interface 610 are located at the upper end of the cathode end plate 603, the lower resin interface 609 and the lower concentrate interface 611 are located at the lower end of the cathode end plate 603, the upper desalination interface 708 and the anode water discharge interface 710 are located at the upper end of the anode end plate 703, and the lower desalination interface 709 is located at the lower end of the anode end plate 703.

[0059] See Figure 6 and Figure 4 A horizontally arranged upper resin main channel 612 is provided above the cathode mounting groove 604 of the cathode end plate 603. The upper resin main channel 612 is connected to the upper resin channel in the membrane stack through upper resin branch channels 614. The number of upper resin branch channels 614 is adapted to the number of regeneration chambers 301. Specifically, the upper resin branch channels 614 are connected to the upper resin channel in the membrane stack. The upper resin channel in the membrane stack is connected to the top of each regeneration chamber 301 through the upper resin flow channel 309 of the resin frame plate 3. A horizontally arranged lower resin main channel 613 is provided below the cathode mounting groove 604. The lower resin main channel 613 is connected to the lower resin channel in the membrane stack through lower resin branch channels 615. The number of lower resin branch channels 615 is adapted to the number of regeneration chambers 301. Specifically, the lower resin branch channels 615 are connected to the lower resin channel in the membrane stack. The lower resin channel in the membrane stack is connected to the bottom of each regeneration chamber 301 through the lower resin flow channel 310 of the resin frame plate 3.

[0060] See also Figure 6 and Figure 5The upper concentrate interface 610 is located at a certain distance below the upper resin interface 608. The upper concentrate main channel 616 is arranged parallel below the upper resin main channel 612. The upper concentrate interface 610 is connected to the upper concentrate main channel 616. The upper concentrate main channel 616 is connected to the upper water distribution tank 605 in the cathode area and the upper concentrate channel in the membrane stack through the upper concentrate branch channel 618. The upper concentrate channel in the membrane stack is connected to the interior of each concentrate partition 5. Specifically, the upper concentrate branch channel 618 is connected to the upper water distribution tank 605 in the cathode area through the upper cathode electrode water flow channel 620. The upper concentrate channel in the membrane stack is connected to the concentrate partition 501 of the concentrate partition 5 through the second upper concentrate through hole 504.

[0061] See Figure 6 and Figure 5 The lower concentrate interface 611 is located at a certain distance above the lower resin interface 609. The lower concentrate main channel 617 is arranged parallel above the lower resin main channel 613. The lower concentrate interface 611 is connected to the lower concentrate main channel 617. The lower concentrate branch channel 619 is connected to the lower water distribution tank 606 in the cathode area and the lower concentrate channel in the membrane stack. The lower concentrate channel in the membrane stack is connected to the interior of each concentrate partition 5. Specifically, the lower concentrate branch channel 619 is connected to the lower water distribution tank 606 in the cathode area through the lower cathode electrode water flow channel 621. The lower concentrate channel in the membrane stack is connected to the concentrate partition 501 of the concentrate partition 5 through the second lower concentrate through hole 507.

[0062] See Figure 7 and Figure 4 A horizontally arranged upper freshwater main channel 711 is provided above the anode mounting groove 704 of the anode end plate 703. An upper freshwater interface 708 is connected to the upper freshwater main channel 711. The upper freshwater main channel 711 is connected to the upper freshwater channel within the membrane stack via upper freshwater branch channels 713. The upper freshwater channel within the membrane stack is connected to the top of each regeneration chamber 301 via the upper freshwater flow channel 311 of the resin frame plate 3. A horizontally arranged lower freshwater main channel 712 is provided below the anode mounting groove 704. A lower freshwater interface 709 is connected to the lower freshwater main channel 712. The lower freshwater main channel 712 is connected to the lower freshwater channel within the membrane stack via lower freshwater branch channels 714. The lower freshwater channel within the membrane stack is connected to the bottom of each regeneration chamber 301 via the lower freshwater flow channel 312 of the resin frame plate 3. The number of upper and lower freshwater branch channels is adapted to the number of regeneration chambers within each resin frame plate.

[0063] See also Figure 7 The upper water distribution tank 705 in the anode area is connected to the anode electrode water discharge interface 710 through a channel. A concentrate blind hole 715 is provided at the lower end of the anode plate and above the lower fresh water main channel 712. The concentrate blind hole is connected to the lower concentrate through hole on the anode membrane. The concentrate blind hole is connected to the lower water distribution tank 706 in the anode area through the lower anode electrode water flow channel 716.

[0064] After the membrane stack is arranged in a regular and complete manner, it is pressed and fixed by the fastening mechanism 8. In a conventional embodiment, the fastening mechanism includes a pair of clamps and a bolt assembly, with the clamps having reinforcing ribs and bolt holes around their perimeter. In a more preferred embodiment, the fastening mechanism includes an easily detachable structure comprising components such as a first fixing frame, a sliding frame, and a second fixing frame. Specifically, for example... Figure 1 and Figure 2 As shown, the fastening mechanism 8 includes a first fixed frame 801 with a first support foot 801A, a sliding frame 802 with a pulley 802A, a second fixed frame 803 with a second support foot 803A, a pair of crossbeams 804 and a pair of crossbars 805 that are fixedly connected to the first fixed frame 801 and the second fixed frame 803, a pair of slide rails 806 fixedly installed on the top of the crossbeams 804, a hydraulic press 807 and four limiting members 808. Each of the two vertical sides of the sliding frame 802 is provided with a pulley fixing member 802B for fixing the pulley 802A below it; on the cathode and anode end plates in the cathode and anode assembly, and on the resin frame plate and concentrate baffle in the membrane stack, there are respectively a pair of cathode end plate supports 622, a pair of anode end plate supports 717, a pair of resin frame plate supports 315 and a pair of concentrate baffle supports 508 for placement; the cathode assembly 6, anode assembly 7, membrane stack 1 and sliding frame 802 are placed on the slide rail 806 together with each pair of supports and pulley 802A.

[0065] A hydraulic press 807 and limiting members 808 are arranged between the sliding frame 802 and the second fixed frame 803. The piston rod 807D end of the hydraulic press and the cylinder 807C are respectively provided with a first flange 807A and a second flange 807B. Four limiting members 808 are symmetrically arranged between the sliding frame and the second fixed frame. Each limiting member includes a third flange 808A, a limiting screw 808B and a limiting nut 808C. One end of the limiting screw 808B is fixedly connected to the third flange 808A, and the other end of the limiting screw 808B is equipped with a limiting nut 808C. A first support plate 802C is provided on the side of the sliding frame 802 facing the second fixed frame 803. The first support plate 802C has bolt through holes adapted to the first flange 807A and the third flange 808A, and is fixedly connected to the first and third flanges by bolts. The second fixed frame 803 has a second support plate 803B on the side facing the sliding frame 802. The second support plate 803B has bolt through holes adapted to the second flange 807B and is fixedly connected to the second flange 807B by bolts. The second support plate 803B also has through holes for the limit screw 808B to move in and out flexibly and to effectively block the limit nut 808C. The hydraulic press 807 is used to temporarily press the first fixed frame 801, the cathode and anode area components, the membrane stack 1 and the sliding frame 802. After pressing in place, the limit nut 808C on the limit screw 808B is turned so that the limit nut 808C abuts against the second fixed frame 803 to form an axial rigid limit support. After the limit support is in place, the hydraulic press can be depressurized, and the limit member 808 restricts the sliding frame 802 from springing back, so that the first fixed frame 801, the cathode and anode area components, the membrane stack 1 and the sliding frame 802 remain in a pressed state even when the hydraulic press is depressurized.

[0066] The operating steps for a single device are as follows: (1) Resin to be recycled is filled The upper resin channel (including the upper resin main channel, upper resin branch channels, and upper resin channels inside the membrane stack), the upper and lower desalination channels (including the upper and lower desalination main channels, upper and lower desalination branch channels, and upper and lower desalination channels inside the membrane stack), and the lower concentrate channel (including the lower concentrate main channel, lower concentrate branch channels, and lower concentrate channels inside the membrane stack) are in the open state, while the remaining channels are in the closed state. The resin to be regenerated, carried by the freshwater flow, enters through the upper resin interface 608 via the external pipeline, and then enters the regeneration chamber 301 through the upper resin main channel 612, the upper resin branch channel 614, the upper resin channel inside the membrane stack, and the upper resin flow channel 309 in the resin frame plate 3, gradually filling the regeneration chamber with the resin to be regenerated. At the same time, water flows out from the upper and lower slit strips, flows through the upper and lower freshwater channels and merges into the upper and lower freshwater channels inside the membrane stack, and then flows through the upper and lower freshwater branch channels and the upper and lower freshwater main channel in sequence, finally exiting from the upper and lower freshwater interfaces. After each regeneration chamber is filled with the resin to be regenerated, the resin filling is completed.

[0067] (2) Electroregeneration After the resin is filled, the upper and lower freshwater channels and the upper and lower concentrate channels are open, while the remaining channels are closed. Freshwater supplied by the external pipeline enters through the lower freshwater inlet 709, flows sequentially through the lower freshwater main channel 712, the lower freshwater branch channel 714, the lower freshwater channel within the membrane stack, and the lower freshwater flow channel 312 and lower slit strip 314 in the resin frame plate 3 before entering the regeneration chamber 301. The freshwater flows upwards through the regeneration chamber 301, then sequentially through the upper slit strip 313 and the upper freshwater flow channel 311, converging into the upper freshwater channel within the membrane stack. It then flows sequentially through the upper freshwater branch channel 713 and the upper freshwater main channel 711, finally exiting from the upper freshwater inlet 708. The freshwater is used to keep the resin constantly immersed without losing moisture and to remove the heat generated within the resin chamber during regeneration. Freshwater flowing from the upper freshwater inlet is recycled through external pipelines, a freshwater tank, and a freshwater pump. Demineralized water is added while appropriate amounts are discharged to meet conductivity and cooling requirements. The discharged freshwater is used as makeup water for the concentrated water.

[0068] During regeneration, concentrate supplied by the external pipeline enters through the lower concentrate inlet 611 and is divided into three paths: the first path flows through the lower concentrate main channel 617, the lower concentrate branch channel 619, and the lower concentrate channel within the membrane stack into the mesh area of ​​the concentrate baffle 5, then flows through the mesh area and merges into the upper concentrate channel within the membrane stack, subsequently flowing through the upper concentrate branch channel 618 and the upper concentrate main channel 616, and finally exits from the upper concentrate inlet 610; the second path flows through the lower concentrate main channel 617, the lower concentrate branch channel 619, and the lower cathode water flow channel 621 into the lower cathode area water distribution tank 60. 6. After flowing through the cathode region, the water flows into the upper cathode region water distribution tank 605, then sequentially through the upper cathode electrode water channel 620, the upper concentrate branch channel 618, and the upper concentrate main channel 616, finally exiting from the upper concentrate interface 610. A third path flows through the lower concentrate main channel 617, the lower concentrate branch channel 619, the lower concentrate channel within the membrane stack, the concentrate blind hole 715 on the anode end plate, and the lower anode electrode water channel 716 into the lower anode region water distribution tank 706. It then flows upwards through the anode region and into the upper anode region water distribution tank 705, finally exiting from the anode electrode water discharge interface 710. The concentrate flowing from the upper concentrate interface is recycled through external pipelines, a concentrate tank, and a concentrate pump, with simultaneous replenishment and drainage to meet conductivity and cooling requirements. The concentrate replenishment water is mostly desalinated water, with any shortfall supplemented by demineralized water. Concentrate is discharged through two routes: one is through the anode water discharge port; the other is through the external concentrate pipeline or concentrate tank. When the regenerated resin is a mixed resin or a single anion resin, hypochlorite will be generated during the anode reaction, which is harmful to both the anion and cation membranes. The effluent from the anode chamber should not be reused and should be discharged first.

[0069] After the water flow stabilizes, a current density of 20-150 A / m is applied to the anode and cathode electrodes on both sides of the membrane stack. 2Under the influence of a direct current electric field, the anions and cations adsorbed in the resin undergo directional migration. Cations permeate through the cation membrane into the corresponding concentrate filter area, and anions permeate through the anion membrane into the corresponding concentrate filter area. All the anions and cations that have migrated to the concentrate filter area are discharged from the device with the concentrate flow. Ultimately, the cation resin is converted to the hydrogen form, and the anion resin is converted to the hydroxide form, achieving effective resin regeneration. After effective regeneration is completed, the direct current is stopped first, followed by the supply of both fresh and concentrated water.

[0070] (3) Resin discharge after regeneration After electroregeneration is completed, the lower resin channel and the upper freshwater channel are open, while the other channels are closed. Freshwater flows in from the upper freshwater interface 708, and flows sequentially through the upper freshwater main channel 711, the upper freshwater branch channel 713, the upper freshwater channel inside the membrane stack, the upper freshwater flow channel 311, and the upper slit strip 313 before entering the regeneration chamber 301. After regeneration, the resin flows sequentially through the lower resin flow channel 310, the lower resin channel inside the membrane stack, the lower resin branch channel 615, and the lower resin main channel 613 under the entrainment of the water flow, and finally exits the device from the lower resin interface 609.

[0071] Two or more devices connected in parallel, and integrated with external auxiliary facilities including pipelines, water pumps, resin transfer pumps, valves, resin storage tanks, and control boxes, constitute a large-scale resin electroregeneration system. Figure 8 Taking the regeneration system with two devices shown as an example, the implementation method is as follows: (1) Resin to be recycled is filled See Figure 9 The outlet valve 910 of the resin storage tank to be regenerated, the upper freshwater inlet discharge valve 911, the upper / lower freshwater inlet main discharge valve 914, and the lower concentrated water inlet discharge valve 918 are opened, while all other valves and pumps are closed. The resin to be regenerated in the resin storage tank 905 flows under the influence of water flow through the regenerated resin storage tank outlet valve 910 and the external resin delivery pipeline, and then enters the first and second resin regeneration devices through the upper resin inlet, respectively. The resin is filled into the regeneration chamber, and water flows out from the upper and lower freshwater inlets, respectively. The water flowing out of the water interface first flows through the upper freshwater interface discharge valve 911, and then merges with the water flowing out of the lower freshwater interface before finally being discharged through the upper / lower freshwater interface main discharge valve 914. The concentrate in the unit (residual from the previous cycle, or used to soak the anion and cation membranes when the equipment is not in use, should be drained completely during filling so that the anion and cation membranes adhere tightly to the concentrate screen for full filling) flows out from the lower concentrate interface and is finally vented through the lower concentrate interface discharge valve 918 to ensure that the anion and cation membranes adhere tightly to the screen, which is beneficial for full resin filling.

[0072] (2) Electroregeneration See Figure 10The following valves are opened: lower freshwater inlet valve 913, upper freshwater outlet valve 915, lower concentrate inlet valve 917, freshwater tank makeup valve 919, upper concentrate outlet valve 920, concentrate pump 921, and freshwater pump 922. All other valves and pumps are closed. Freshwater in freshwater tank 907 is supplied by freshwater pump 922, flows through lower freshwater inlet valve 913, and then flows into the first and second resin regeneration devices from the lower freshwater inlet. It then flows from bottom to top through the regeneration chamber and finally flows out of the device from the upper freshwater inlet, before returning to freshwater tank 907 via upper freshwater outlet valve 915. Concentrate in concentrate tank 906 is supplied by concentrate pump 921, flows through concentrate inlet valve 917, and then flows into the first and second resin regeneration devices from the lower concentrate inlet. The regeneration device has three internal channels, with water flowing from bottom to top into the concentrate filter area and the anode and cathode areas respectively. The effluent from the anode area flows out through the anode water discharge port and is discharged externally. The effluent from the concentrate filter area merges with the effluent from the cathode area and flows out through the upper concentrate port, then returns to the concentrate tank 906 via the upper concentrate port outlet valve 920. After the water flow stabilizes, direct current is applied to the anode and cathode electrodes on both sides of the membrane stack to electro-regenerate the packed resin. During electro-regeneration, the demineralized water tank is replenished with demineralized water through the demineralized water tank replenishment valve 919, while some demineralized water overflows into the concentrate tank 906 through the overflow port 925. The concentrate tank then discharges some concentrate through the concentrate overflow port 924. After effective regeneration is completed, the direct current is stopped first, and then all pumps and valves are shut off.

[0073] (3) Regenerated resin discharge See Figure 11 The resin transfer tank inlet valve 908, the upper freshwater inlet valve 912, the freshwater pump 922, and the resin delivery pump 923 are all open, while all other valves and pumps are closed. Freshwater in the freshwater tank 907 is delivered by the freshwater pump 922, flows through the upper freshwater inlet valve 912, and then flows into the first and second resin regeneration devices from the upper freshwater inlet. The regenerated resin in the resin chamber is carried out from the lower resin inlet device by the freshwater flow, and then enters the resin transfer tank 903 after passing through the resin transfer tank inlet valve 908. Then, it is sent to the regenerated resin storage tank 904 for temporary storage by the resin delivery pump. The regenerated resin in the regenerated resin storage tank 904 will be sent to the relevant high-speed mixed bed by opening the regenerated resin storage tank outlet valve 909 according to external instructions.

[0074] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An apparatus for electro-regenerating spent ion exchange resin, comprising a membrane stack, a cathode region assembly and an anode region assembly located on both sides of the membrane stack, and a fastening mechanism for pressing and fixing the cathode region assembly, the membrane stack, and the anode region assembly, wherein the membrane stack is arranged sequentially from the cathode region assembly side to the anode region assembly side, with a cation membrane, a resin frame plate, an anion membrane, and a concentrate separator as basic units, and then concludes with a cation membrane, a resin frame plate, and an anion membrane in sequence; characterized in that, The central region of the resin plate frame has several vertically parallel cavities that penetrate the central region on both the front and back sides. The cavities, together with a pair of anion membranes and cation membranes closely attached to both sides of the resin plate frame, form several regeneration chambers for resin regeneration. The non-penetrating areas between adjacent regeneration chambers serve as support strips. Each regeneration chamber in the resin plate frame is independently provided with resin inlet and outlet channels and fresh water inlet and outlet channels, and the resin inlet and outlet channels and fresh water inlet and outlet channels are independent of each other.

2. The apparatus according to claim 1, characterized in that, The thickness of the resin frame plate is 5-50mm; the height and width of the regeneration chamber are 300-2000mm and 30-250mm respectively; the width of the support strip between adjacent regeneration chambers is 2-50mm.

3. The apparatus according to claim 1, characterized in that, Each regeneration chamber of the resin frame plate is provided with first upper and lower resin through holes, first upper and lower fresh water through holes, and first upper and lower concentrated water through holes, which are vertically penetrating the resin frame plate. Each first upper resin through hole is connected to the top of each regeneration chamber through an upper resin channel, and each first lower resin through hole is connected to the bottom of each regeneration chamber through a lower resin channel. Each regeneration chamber is also provided with upper and lower fine slits for resin retention at the top and bottom. The upper fine slits are connected to the corresponding first upper fresh water through holes through upper fresh water channels, and the lower fine slits are connected to the corresponding first lower fresh water through holes through lower fresh water channels. The upper resin channels and upper fresh water channels are arranged parallel to each other and are not directly connected. The lower resin channels and lower fresh water channels are arranged parallel to each other and are not directly connected. All the upper resin channels, lower resin channels, upper fresh water channels, and lower fresh water channels are closed-hole channels.

4. The apparatus according to claim 3, characterized in that, The concentrate baffle is a plate-frame structure, with a mesh in the middle area; the thickness of the concentrate baffle is 0.5-3.0mm; the upper and lower edges of the plate-frame structure are respectively provided with through holes corresponding to the resin frame plate, including second upper and lower resin through holes, second upper and lower distillate through holes, and second upper and lower concentrate through holes; the top and bottom of the mesh are directly connected to the second upper and lower concentrate through holes of the concentrate baffle.

5. The apparatus according to claim 4, characterized in that, Both the anion membrane and the cation membrane are provided with through holes that correspond one-to-one with the resin frame plate and the concentrate baffle. After the cation membrane, the resin frame plate, the anion membrane and the concentrate baffle are tightly connected according to the arrangement rules, all the corresponding through holes form the upper and lower resin channels, the upper and lower desalination channels and the upper and lower concentrate channels inside the membrane stack.

6. The apparatus according to claim 5, characterized in that, The cathode assembly includes a mesh cathode, cathode terminals, and a cathode end plate; the anode assembly includes a mesh anode, anode terminals, and an anode end plate; the cathode and anode end plates facing the membrane stack are respectively provided with sized matching cathode and anode mounting grooves; the upper and lower ends of the cathode and anode mounting grooves are respectively provided with horizontal upper and lower cathode water distribution grooves and horizontal upper and lower anode water distribution grooves; several parallel vertical grooves of the cathode area and vertical grooves of the anode area are respectively provided between the upper and lower cathode water distribution grooves and between the upper and lower anode water distribution grooves; the mesh cathode fixed in the cathode mounting groove is in close contact with the anode membrane, and the mesh anode fixed in the anode mounting groove is in close contact with the cathode membrane.

7. The apparatus according to claim 6, characterized in that, Seven types of interfaces are integrated on the cathode and anode end plates, including an upper resin interface, a lower resin interface, an upper desalination interface, a lower desalination interface, an upper concentrate interface, a lower concentrate interface, and an anode electrode water discharge interface. These seven types of interfaces are either concentrated on the same end plate or distributed on different end plates. The upper concentrate interface is connected to the upper cathode area water distribution tank and the upper concentrate channel in the membrane stack through a channel in the corresponding end plate. The lower concentrate interface is connected to the lower cathode area water distribution tank, the lower anode area water distribution tank, and the lower concentrate channel in the membrane stack through a channel in the corresponding end plate. The anode electrode water discharge interface is connected to the upper anode area water distribution tank through a channel in the corresponding end plate. The remaining interfaces are connected to the upper and lower resin channels and the upper and lower desalination channels in the membrane stack through corresponding channels in their respective end plates.

8. The apparatus according to claim 1, characterized in that, The fastening mechanism includes a pair of clamps and a bolt assembly, wherein the clamps are reinforced with ribs and have bolt holes around their perimeter.

9. The apparatus according to claim 1, characterized in that, The fastening mechanism includes a first fixed frame, a sliding frame, a second fixed frame, and a crossbeam connecting the first fixed frame and the second fixed frame, all arranged vertically and sequentially. The sliding frame and the crossbeam are slidably engaged. The membrane stack is clamped between the first fixed frame and the sliding frame. A hydraulic press and a limiting member are provided between the sliding frame and the second fixed frame. The sliding frame is driven by the hydraulic press to slide along the crossbeam to press the membrane stack and is limited by the limiting member.

10. A system for electro-regenerating depleted ion exchange resin, characterized in that, The system includes two or more devices as described in any one of claims 1 to 9, arranged in parallel, and external auxiliary facilities consisting of pipelines, concentrate pumps, desalination pumps, resin transfer pumps, valves, resin storage tanks, resin transfer tanks, concentrate tanks, desalination tanks, and control boxes. The resin storage tanks include a resin storage tank to be regenerated and a regenerated resin storage tank.

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