Anion-cathode double-membrane electrodeionization device with integrated frame structure

Abstract

The utility model discloses a positive and negative double-membrane electrodeionization device with an integrated frame body structure, which comprises a reaction chamber enclosed by a frame body, an anode chamber cover plate and a cathode chamber cover plate, and the reaction chamber internally comprises an anode chamber, a resin chamber and a cathode chamber which are formed by an anion exchange membrane and a cation exchange membrane at intervals and are arranged in sequence, the resin chamber is respectively communicated with a water inlet / regeneration water outlet connector and a water production / regeneration water inlet connector; the device further comprises a plurality of rigid supporting pieces, each rigid supporting piece is provided with a binding face capable of being tightly attached to the outer wall face of the frame body, the frame body is clamped between the anode chamber cover plate and the cathode chamber cover plate and connected in a sealed mode, and the rigid supporting pieces are distributed at intervals in the mode that the binding faces of the rigid supporting pieces are tightly attached to the outer wall face of the frame body. And the two ends of each rigid supporting piece are fixedly connected with the anode chamber cover plate and the cathode chamber cover plate respectively. The tight hooping effect of the rigid supporting piece can greatly improve the bearing strength of the whole device, so that the device is not prone to deformation and fracture when bearing large internal pressure, and the service life of the device is greatly prolonged.

Description

Technical Field

[0001] This application relates to the field of deep desalination technology in water treatment, and in particular to an integrated frame structure dual-membrane electro-deionization device. Background Technology

[0002] With the rapid development of industrialization and urbanization, water scarcity and water pollution have become increasingly prominent, leading to a growing demand for water treatment technologies. Among these, EDI (electrodeionization) technology, as a highly efficient water treatment technology, has been widely used in the deep desalination of high-purity water required by industries such as power, electronics, chemicals, pharmaceuticals, and papermaking. EDI technology combines the advantages of electrodialysis and ion exchange, offering outstanding benefits such as environmental friendliness, high automation, low operating costs, high-quality produced water, and convenient management.

[0003] Despite the numerous advantages of EDI technology, existing technologies still have some shortcomings. For example, traditional EDI devices require a large number of specialized ion exchange membranes, resulting in high costs, complex structures, and difficult maintenance. Furthermore, in some EDI technologies, during electroregeneration, anions or cations undergo reverse electromigration, which is detrimental to regeneration, affecting electroregeneration efficiency and the quality of subsequent produced water. To address this issue, the applicant disclosed a dual-membrane electrodeionization device in a previous patent document (CN 119059618 A). However, later applications revealed that this device has a complex and numerous frame structure. Each EDI device is assembled from a considerable number of standard modules, each requiring precise alignment and sealing, increasing assembly difficulty and cost. Additionally, leakage is prone to occur between standard modules, resulting in limited overall pressure resistance; high inlet water pressure can cause deformation and damage to the device. Utility Model Content

[0004] To address the aforementioned issues, this application, based on previous research, optimizes and improves the structure of the dual-membrane electro-deionization device by adopting a rigid support frame structure. The improved device significantly enhances the overall pressure resistance, making it less prone to deformation and breakage under high internal pressure, thus greatly extending the device's service life and improving its reliability and durability. Furthermore, combined with improvements to the frame structure, the internal structure of the frame is simplified, the frame thickness is reduced, and costs are lowered while facilitating production and processing.

[0005] An integrated frame structure dual-membrane electro-deionization device includes a reaction chamber enclosed by a frame, an anode chamber cover plate, and a cathode chamber cover plate. The reaction chamber includes an anode chamber, a resin chamber, and a cathode chamber arranged sequentially and separated by anion exchange membranes and cation exchange membranes. The resin chamber is connected to an inlet / regeneration outlet and a product water / regeneration inlet, respectively. Resin retention plates are arranged at the top and bottom of the resin chamber.

[0006] It also includes several rigid support members, each having a contact surface that can be tightly attached to the outer wall of the frame. The frame is sandwiched between the anode chamber cover plate and the cathode chamber cover plate and is sealed to both the anode chamber cover plate and the cathode chamber cover plate. The rigid support members are spaced apart with their contact surfaces tightly attached to the outer wall of the frame. Both ends of all the rigid support members are fixedly connected to the anode chamber cover plate and the cathode chamber cover plate, respectively.

[0007] The anode chamber cover and anion exchange membrane together form the anode chamber, the cation exchange membrane and cathode chamber cover together form the cathode chamber, and the anion exchange membrane, frame, upper and lower resin retention plates, and cation exchange membrane together form the resin chamber. The resin chamber is connected to the inlet / regeneration outlet and the product / regeneration inlet respectively. The overall structure of the device is achieved by sealing the frame with the anode chamber cover and the cathode chamber cover, and fixing it with the anode chamber cover and the cathode chamber cover through rigid support members.

[0008] In this connection method, the anode chamber cover and cathode chamber cover are fixed to rigid support components such as steel pipes using fasteners like bolts. The clamping effect of the steel pipes significantly improves the overall pressure-bearing strength of the device, making it less prone to deformation and cracking under high internal pressure, thus greatly extending the device's service life and improving its reliability and durability. Simultaneously, the frame no longer needs to bear the load of fasteners, which also greatly reduces the frame's wall thickness, facilitating its manufacturing and processing. The improved dual-membrane electro-deionization device of this application significantly reduces the frame's wall thickness for easier manufacturing while also greatly improving the overall pressure-bearing strength of the device.

[0009] Optionally, the top and bottom of the frame are both integrally formed with the frame. The top water channel serves as a water inlet / regeneration outlet channel, connecting the water inlet / regeneration outlet interface and the resin chamber; the bottom water channel serves as a water production / regeneration inlet channel, connecting the water production / regeneration inlet interface and the resin chamber.

[0010] The inlet / regenerated outlet interface refers to a structure that serves as both an inlet and a regenerated outlet interface. It is used as an inlet interface during water treatment and as a regenerated outlet interface during regeneration. The inlet / regenerated outlet channel is understood in the same way. The product water / regenerated inlet interface refers to a structure that serves as both a product water interface and a regenerated inlet interface. It is used as a product water interface during water treatment and as a regenerated inlet interface during regeneration. The product water / regenerated inlet channel is understood in the same way.

[0011] Optionally, the frame is a hollow structure with openings at both ends, having a top wall, a bottom wall, and opposing side walls. The two ends of the openings are respectively sealed and connected to the anode chamber cover plate and the cathode chamber cover plate. The water channel is an integral structure with the corresponding top wall and bottom wall.

[0012] Optionally, the resin retaining plate has a water passage gap, through which the resin chamber and the corresponding water channel are connected.

[0013] The frame is a hollow, rectangular structure formed by one-piece molding and pressed, and the material is an insulating material. The top of the frame is provided with a water inlet / regeneration water outlet channel, and the bottom of the frame is provided with a water production / regeneration water inlet channel. The upper and lower sides of the frame are respectively arranged with an upper resin interception plate and a lower resin interception plate. The resin interception plate has a water passage gap, and the resin chamber is connected to the corresponding water channel through the water passage gap.

[0014] The water channel is integrally molded with the frame, which greatly simplifies the internal structure of the frame. There is no need to set up a separate complex water channel pipeline, which simplifies the assembly method, significantly improves assembly efficiency, reduces the risk of equipment leakage, and reduces production and manufacturing costs.

[0015] In this application, the frame is supported by rigid external supports, and the frame no longer needs to bear the load of fasteners. This greatly reduces the requirement for wall thickness, thereby lowering production and processing costs and significantly improving the feasibility of production and processing. Optionally, the wall thickness of the frame is 8–20 mm.

[0016] Optionally, the rigid support member has a rectangular, trapezoidal, or other polygonal cross-section, and the rigid support member is fixed to both the anode chamber cover and the cathode chamber cover by bolts.

[0017] The rigid support member can be made of steel or other materials with high mechanical strength and durability. Optionally, the rigid support member is a steel pipe with a rectangular, trapezoidal, or other polygonal cross-section.

[0018] Both ends of the steel pipe are provided with threaded holes. These threaded holes are strictly coaxial and concentric with the threaded holes on the anode chamber cover plate and the cathode chamber cover plate, and the hole diameter is exactly the same. Both ends of the steel pipe are fastened to the anode chamber cover plate and the cathode chamber cover plate respectively by bolts. One side of the steel pipe is tightly fitted to the side of the frame. The number of steel pipes is precisely matched with the number of threaded holes on the anode chamber cover plate and the cathode chamber cover plate.

[0019] Optionally, the anode chamber cover plate is provided with an anode chamber outlet and an anode chamber inlet arranged vertically; the cathode chamber cover plate is provided with a cathode chamber outlet and a cathode chamber inlet arranged vertically; and the anode chamber cover plate or the cathode chamber cover plate is provided with the inlet / regenerated water outlet and the product water / regenerated water inlet.

[0020] That is, the inlet / regenerated water outlet and the product water / regenerated water inlet are both located on the anode chamber cover or both on the cathode chamber cover; the anode chamber and the cathode chamber are respectively equipped with their own inlets and outlets, and the electrode water is all introduced from the bottom and exited from the top.

[0021] In one embodiment, the outer side of the cathode chamber cover is provided with a water inlet / regeneration outlet, a product water / regeneration inlet, a cathode chamber inlet, and a cathode chamber outlet; the side of the anode chamber cover is provided with an anode chamber inlet and an anode chamber outlet.

[0022] Optionally, the anode chamber inlet and the cathode chamber inlet are connected by an external pipeline; the anode chamber outlet and the cathode chamber outlet are also connected by an external pipeline. This facilitates synchronous control of the flow rates in the anode and cathode chambers. Compared to installing electrode water pipes inside the frame, using external pipelines greatly simplifies the internal structure of the frame and facilitates processing, production, and assembly.

[0023] Optionally, a mesh anode is provided in the anode chamber; a mesh cathode is provided in the cathode chamber; the anode chamber cover plate has an anode terminal for connecting the mesh anode and an external power source, and the cathode chamber cover plate has a cathode terminal for connecting the mesh cathode and an external power source.

[0024] Compared with existing technologies, it has at least one of the following beneficial effects:

[0025] (1) It simplifies the assembly method, significantly improves assembly efficiency, reduces the risk of equipment leakage, and reduces production and manufacturing costs.

[0026] (2) The clamping effect of the steel pipe can greatly improve the pressure resistance of the entire device, making it less prone to deformation and cracking when subjected to large internal pressure, thus greatly extending the service life of the device and improving its reliability and durability.

[0027] (3) The internal structure of the frame is simplified, making it easier to manufacture and process.

[0028] (4) Reduce the thickness of the frame to lower costs and facilitate production and processing. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the device in this application.

[0030] Figure 2 for Figure 1 A schematic diagram of the structure after removing the cathode chamber section.

[0031] Figure 3 This is a structural diagram of the frame.

[0032] Figure 4 for Figure 1 A schematic diagram of the structure from the side view (direction A) of the anode chamber cover plate.

[0033] Figure 5 for Figure 4 A cross-sectional view along the BB direction.

[0034] The reference numerals in the figure are as follows:

[0035] 1. Frame, 1a. Top wall, 1b. Bottom wall, 1c. Side wall; 2. Anode chamber cover; 3. Cathode chamber cover; 4. Rigid support, 4a. Threaded hole; 5. Inlet / regeneration outlet channel; 6. Product water / regeneration inlet channel; 7. Anode chamber inlet; 8. Anode chamber outlet; 9. Anode terminal; 10. Bolt; 11. Inlet / regeneration outlet interface; 12. Product water / regeneration inlet interface; 13. Cathode chamber inlet; 14. Cathode chamber outlet; 15. Cathode terminal; 16. Anion exchange membrane; 17. Cathode exchange membrane; 18. Anode chamber; 19. Resin chamber; 20. Cathode chamber; 21. Mesh anode; 22. Mesh cathode; 23. Upper resin retention plate; 24. Lower resin retention plate; 25. Seal A; 26. Seal B. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] See Figure 1 , Figure 2 and Figure 5 An integrated frame structure dual-membrane electro-deionization device includes a reaction chamber enclosed by a frame 1, an anode chamber cover plate 2, and a cathode chamber cover plate 3. The reaction chamber includes an anode chamber 18, a resin chamber 19, and a cathode chamber 20 arranged sequentially by an anion exchange membrane 16 and a cation exchange membrane 17. The resin chamber is connected to an inlet / regeneration outlet 11 and a product water / regeneration inlet 12, respectively. An upper resin retention plate 23 is provided on the top of the resin chamber 19, and a lower resin retention plate 24 is provided on the bottom. The electro-deionization device also includes several rigid support members 4, which have a contact surface that can be tightly fitted to the outer wall of the frame. The rigid support members can be made of steel, for example, a steel pipe with a rectangular, trapezoidal or other polygonal cross-section. The frame 1 is clamped between the anode chamber cover plate 2 and the cathode chamber cover plate 3 and is sealed between the anode chamber cover plate and the cathode chamber cover plate. The contact surfaces of the rigid support members are tightly attached to the outer wall of the frame 1 and are spaced apart. The two ends of all the rigid support members are fixedly connected to the anode chamber cover plate 2 and the cathode chamber cover plate 3, respectively.

[0039] The anode chamber cover plate 2 and the anion exchange membrane 16 form the anode chamber 18, the cation exchange membrane 17 and the cathode chamber cover plate 3 form the cathode chamber 20, and the anion exchange membrane 16, the frame 1, the upper resin retention plate 23, the lower resin retention plate 24 and the cation exchange membrane 17 together form the resin chamber 19. The overall structure of the device is achieved by sealing the frame 1 with the anode chamber cover plate 2 and the cathode chamber cover plate 3 respectively, and fixing it with the anode chamber cover plate 2 and the cathode chamber cover plate 3 through rigid support members.

[0040] See Figure 2 , Figure 3 and Figure 5 The top and bottom of the frame 1 are both integrally formed with water channels. The water channel at the top serves as the water inlet / regeneration outlet channel 5, connecting the water inlet / regeneration outlet interface 11 and the resin chamber 19. The water channel at the bottom serves as the water production / regeneration inlet channel 6, connecting the water production / regeneration inlet interface 12 and the resin chamber 19.

[0041] like Figure 3 As shown, the frame 1 is a hollow, pre-molded, rectangular-like structure. This design eliminates the need for assembly of multiple standard modules, simplifying assembly, reducing the risk of leakage, and improving the reliability of the device. The frame is made of insulating material. The frame has a top wall 1a, a bottom wall 1b, and opposing side walls 1c. The two ends of the opening are sealed to the anode chamber cover plate 2 and the cathode chamber cover plate 3 respectively through sealing element A 25 and sealing element B 26. The water inlet / regeneration outlet channel 5 and the product water / regeneration inlet channel 6 are integral structures with the top and bottom walls and protrude outwards.

[0042] The upper resin retention plate 23 and lower resin retention plate 24 are respectively arranged on the upper and lower sides of the internal frame 1. Both the upper resin retention plate 23 and the lower resin retention plate 24 have water passage gaps. The inlet / regeneration outlet water channel 5 and the product water / regeneration inlet water channel 6 are connected to the resin chamber through the water passage gaps on the corresponding resin retention plates. The resin chamber 19 is filled with a mixture of anionic and cationic resins, which are fully compressed during filling. This improved frame structure greatly simplifies the internal structure of the frame, eliminating the need for separate and complex water channel pipelines, simplifying the assembly method, significantly improving assembly efficiency, reducing the risk of equipment leakage, and reducing production and manufacturing costs.

[0043] See Figure 1 and Figure 2 Steel pipes are fixed to the top and bottom walls of the frame, located on both sides of the corresponding water channels, and steel pipes are evenly spaced along the side walls. The cross-section of the steel pipes can be rectangular, trapezoidal, or other polygonal. The steel pipes are fixed to the anode chamber cover and the cathode chamber cover with bolts. Figure 2In the illustrated embodiment, the length of the steel pipe is slightly shorter than the length of the frame 1, and its cross-sectional shape is rectangular. Both ends of the steel pipe are provided with threaded holes 4a, which are strictly coaxial and concentric with the threaded holes on the anode chamber cover plate 2 and the cathode chamber cover plate 3, and their diameters are completely identical. The two ends of the steel pipe are fastened to the anode chamber cover plate 2 and the cathode chamber cover plate 3 respectively using bolts 10, and sealed with sealing elements A and B. The axial tensile force of the bolts ensures a leak-proof seal between the anode chamber cover plate 2 and the cathode chamber cover plate 3 and the two ends of the frame 1. Simultaneously, one side of the steel pipe fits tightly against the side of the frame 1, acting as a reinforcing rib of the frame and effectively preventing outward deformation of the frame's interior under pressure. Furthermore, the number of steel pipes precisely matches the number of threaded holes on the anode chamber cover plate 2 and the cathode chamber cover plate 3 to meet the connection and support requirements of the overall structure.

[0044] In this application, the frame is supported by steel pipes, and the frame no longer needs to bear fasteners, greatly reducing the wall thickness requirement, which can reduce the production and processing cost and significantly improve the feasibility of production and processing. The wall thickness of the frame is 8-20mm.

[0045] See Figure 4 The anode chamber cover plate 2 has an anode chamber inlet 7 on the lower part of its outer side, an anode chamber outlet 8 on the upper part, and an anode terminal 9 in the middle. The anode chamber cover plate 2 has threaded holes around its perimeter, which are strictly coaxial and concentric with the threaded holes of the steel pipe, and the hole diameters are completely consistent. The anode chamber cover plate is made of insulating material. The anode chamber inlet 7 is used to introduce electrode water, the anode chamber outlet 8 is used to discharge electrode water, and the anode terminal 9 is used to connect to the positive terminal of the power supply.

[0046] See Figure 1 and Figure 5 The cathode chamber cover 3 has an inlet / regeneration outlet 11, a product water / regeneration inlet 12, a cathode chamber inlet 13, a cathode chamber outlet 14, and a cathode terminal block 15 on its outer side. The cathode chamber cover 3 has threaded holes around its perimeter, which are strictly coaxial and concentric with the threaded holes of the steel pipe, and the hole diameters are completely identical. The cathode chamber cover is made of insulating material. The inlet / regeneration outlet 11 is connected to the inlet / regeneration outlet channel 5 of the frame 1, and the product water / regeneration inlet 12 is connected to the product water / regeneration inlet channel 6 of the frame 1. The inlet / regeneration outlet 11 is used to introduce the water sample to be treated during the treatment stage and to discharge the regenerated water during the electroregeneration stage. The product water / regeneration inlet 12 is used to discharge the treated product water during the treatment stage and to introduce the regenerated water during the electroregeneration stage. The cathode chamber inlet 13 is used for introducing electrode water, the cathode chamber outlet 14 is used for discharging electrode water, the cathode chamber inlet 13 and the anode chamber inlet 7 are connected by an external pipe, the cathode chamber outlet 14 and the anode chamber outlet 8 are connected by an external pipe, and the cathode terminal 15 is used to connect to the negative terminal of the power supply.

[0047] See Figure 5The inner side of the anode chamber cover plate 2 is provided with a groove, and multiple protruding supports are provided on the groove. The mesh anode 21 is placed between the protruding supports on the groove of the anode chamber cover plate and the anion exchange membrane 16 and is in close contact with both. During electroregeneration, the electrode water passes through the gaps between the protruding supports and the gaps of the mesh anode.

[0048] See Figure 5 The inner side of the cathode chamber cover plate 3 has a groove, and multiple protruding supports are provided on the groove. The mesh cathode 22 is placed between the protruding supports on the cathode chamber cover plate groove and the cation exchange membrane 17 and is in close contact with both. During electroregeneration, the electrode water passes through the gaps between the protruding supports and the gaps in the mesh cathode.

[0049] See Figure 5 Both the upper resin trapping plate 23 and the lower resin trapping plate 24 are insulating plates with multiple trapezoidal slits and multiple reinforcing ribs. The narrowest part of the slit is 0.20-0.35mm, which is used to effectively trap resin particles but allow water to flow smoothly into and out of the resin chamber 19. The slits serve as water passages, connecting the resin chamber and the corresponding water channels.

[0050] The above-mentioned device operates by alternating between processing and electrical regeneration. The specific operation process is as follows:

[0051] During processing, no water flows into the anode chamber 18 and the cathode chamber 20. All water samples to be treated flow in through the inlet / regeneration outlet 11, through the inlet / regeneration outlet channel 5 and the upper resin retention plate 23 into the resin chamber 19. At this time, the impurity ions in the water sample are adsorbed by the mixed ion exchange resin. The treated pure water flows out of the resin chamber 19 through the lower resin retention plate 24, then through the product water / regeneration inlet channel 6, and finally flows into the product water header through the product water / regeneration inlet 12.

[0052] During electroregeneration, the permeate obtained during the treatment process is used as the regeneration water for resin chamber 19. The regeneration water in the permeate header flows continuously through resin chamber 19 in the opposite direction to that during the treatment process. That is, the regeneration water flows in from the permeate / regeneration inlet 12, passes through the permeate / regeneration inlet channel 6 and the lower resin retainer plate 24, and then enters resin chamber 19. After flowing through resin chamber 19, the regeneration water flows out through the upper resin retainer plate 23, the inlet / regeneration outlet channel 5, and the inlet / regeneration outlet 11. Part of the regeneration water is directly discharged, and the other part is used as electrode water. The electrode water flows continuously into cathode chamber 20 and anode chamber 18 through cathode chamber inlet 13 and anode chamber inlet 7, respectively, and then merges and is discharged from cathode chamber outlet 14 and anode chamber outlet 8, respectively. While the electrode water is continuously flowing through cathode chamber 20 and anode chamber 18, a current density of 150 A / m is applied. 2The direct current is used to electroregenerate the resin in the resin chamber 19. The electric field direction in the resin chamber 19 is perpendicular to the water flow direction, which can effectively overcome the problem of reverse electromigration of anions or cations that is not conducive to resin regeneration. Most of the impurity ions in the resin are released into the regenerated water during the electroregeneration process and carried out of the resin chamber 19 by the water flow. Some impurity ions also enter the cathode chamber 20 and anode chamber 18 through electromigration and are discharged. In this way, the regeneration of the resin in the resin chamber can be effectively realized. Part of the regenerated water flowing out of the resin chamber 19 is discharged directly, and the other part of the regenerated water flows through the cathode chamber 20 and anode chamber 18 before being discharged.

[0053] The water sample to be treated had an electrical conductivity of approximately 0.7 μS / cm. Figures 1-5 The apparatus shown is used for processing, and the effective area of ​​both the anion exchange membrane 16 and the cation exchange membrane 17 is 120 cm². 2 The distance between the two membranes is 30 cm, and the resin chamber 19 is filled with a mixture of anion and cation exchange resins. Alternating treatment and electroregeneration operations are adopted, with treatment time of 240 min and electroregeneration time of 20 min per cycle. The treatment flow rate and electroregeneration flow rate are 900 L / h and 350 L / h, respectively. The current density during electroregeneration is 150 A / m³. 2 The average voltage is approximately 350V. After stable operation, the conductivity of the produced water is 0.060μs / cm.

[0054] 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 integrated frame structure dual-membrane electro-deionization device, comprising a reaction chamber enclosed by a frame, an anode chamber cover plate, and a cathode chamber cover plate, wherein the reaction chamber includes an anode chamber, a resin chamber, and a cathode chamber arranged sequentially by anion exchange membranes and cation exchange membranes, wherein the resin chamber is respectively connected to an inlet / regeneration outlet and a product water / regeneration inlet, and resin retention plates are arranged at the top and bottom of the resin chamber; Its features are, It also includes several rigid support members, each having a contact surface that can be tightly attached to the outer wall of the frame. The frame is sandwiched between the anode chamber cover plate and the cathode chamber cover plate and is sealed to both the anode chamber cover plate and the cathode chamber cover plate. The rigid support members are spaced apart with their contact surfaces tightly attached to the outer wall of the frame. Both ends of all the rigid support members are fixedly connected to the anode chamber cover plate and the cathode chamber cover plate, respectively.

2. The dual-membrane electro-deionization device according to claim 1, characterized in that, The top and bottom of the frame are both integrally formed with water channels. The water channel at the top serves as a water inlet / regeneration outlet channel, connecting the water inlet / regeneration outlet interface and the resin chamber. The water channel at the bottom serves as a water production / regeneration inlet channel, connecting the water production / regeneration inlet interface and the resin chamber.

3. The dual-membrane electro-deionization device according to claim 2, characterized in that, The frame is a hollow structure with openings at both ends, and has a top wall, a bottom wall and opposite side walls. The two ends of the openings are respectively sealed to the anode chamber cover plate and the cathode chamber cover plate through corresponding sealing elements. The water channel is an integral structure with the corresponding top wall and bottom wall.

4. The dual-membrane electro-deionization device according to claim 2, characterized in that, The resin retaining plate has a water passage gap, through which the resin chamber and the corresponding water channel are connected.

5. The dual-membrane electro-deionization device according to claim 1, characterized in that, The wall thickness of the frame is 8-20mm.

6. The dual-membrane electro-deionization device according to claim 1, characterized in that, The rigid support has a rectangular, trapezoidal or other polygonal cross-section, and the rigid support is fixed to the anode chamber cover and the cathode chamber cover by bolts.

7. The dual-membrane electro-deionization device according to claim 6, characterized in that, The rigid support is a steel pipe with a rectangular, trapezoidal or other polygonal cross-section.

8. The dual-membrane electro-deionization device according to claim 1, characterized in that, The anode chamber cover plate is provided with an anode chamber outlet and an anode chamber inlet arranged vertically; the cathode chamber cover plate is provided with a cathode chamber outlet and a cathode chamber inlet arranged vertically; the anode chamber cover plate or the cathode chamber cover plate is provided with the water inlet / regenerated water outlet and the product water / regenerated water inlet.

9. The dual-membrane electro-deionization device according to claim 8, characterized in that, The anode chamber inlet and the cathode chamber inlet are connected by an external pipeline; the anode chamber outlet and the cathode chamber outlet are connected by an external pipeline.

10. The dual-membrane electro-deionization device according to claim 1, characterized in that, The anode chamber is provided with a mesh anode; the cathode chamber is provided with a mesh cathode; the anode chamber cover has an anode terminal for connecting the mesh anode and an external power source, and the cathode chamber cover has a cathode terminal for connecting the mesh cathode and an external power source.

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