An electric mixed bed composed of a metal shell and an insulating inner liner

Abstract

This application discloses an electro-mixed bed composed of a metal shell and an insulating inner liner, comprising a housing, a cover plate, anode and cathode electrodes, an upper water distribution assembly, a lower water distribution assembly, and an ion exchange resin layer filled between the upper and lower water distribution assemblies. The housing has an opening only at the top, and its interior is rectangular, with the cover plate closing over the opening. The housing is a composite structure shell composed of a first insulating inner liner and a metal shell with first reinforcing ribs on its outer wall. This application replaces the traditional single insulating material shell structure with a composite material structure combining a reinforcing metal shell and an insulating inner liner, significantly enhancing mechanical strength while maintaining good insulation performance, and effectively solving problems such as the difficulty in scaling up traditional devices, the limitation of resin layer height, and insufficient pressure bearing capacity.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, specifically to an electric mixed bed composed of a metal shell and an insulating inner liner. Background Technology

[0002] Electro-mixed bed (also known as membrane-free EDI) is a new deep desalination technology. Compared with conventional EDI, this technology has the advantages of simple structure, low manufacturing cost, easy maintenance, long service life, no need for acid washing, high water recovery rate, and low energy consumption. It has been industrialized in industries such as power, chemical, and papermaking.

[0003] However, both conventional EDI devices and electric mixed beds (e.g., the membrane-free EDI devices disclosed in CN102153166A, CN102583646A, CN104445535A, and CN111422950A) generally use insulating materials to make the frame plates and shells, and both have some significant defects in practical applications.

[0004] Firstly, due to limitations in the strength of insulation materials and manufacturing processes, conventional EDI devices and electric mixed beds using UPVC, ABS, PP, reinforced nylon, and fiberglass as insulation materials for frames or shells are difficult to scale up, with the maximum water production flow rate of a single unit generally not exceeding 8m³. 3 / h. When these products are used for large-scale high-purity water treatment, the number of devices is large, the piping and control are complex, the investment cost is high, and maintenance is not easy.

[0005] Secondly, due to the limited size of the equipment, the resin layer height of existing conventional EDI devices and electric mixed beds is generally low, usually less than 0.5m, which has strict requirements on the quality of the influent water. In practical applications, when the conductivity of the influent water reaches 7-8μs / cm, the quality of the effluent water will decrease significantly while the treatment flow rate remains unchanged.

[0006] Firstly, due to limitations in the strength and deformation of insulation materials, conventional EDI devices and electric mixed beds typically withstand a maximum pressure of only 0.7 MPa, making them unsuitable for high-pressure applications. For example, the outlet pressure of condensate pumps in large power plants can reach 2.0-4.0 MPa. Therefore, when existing conventional EDI devices or electric mixed beds are used to treat high-pressure condensate, it is necessary to take measures to reduce the pressure of the condensate system, treat it, and then increase the pressure again, which leads to system complexity, increased energy consumption, and decreased safety and reliability.

[0007] In addition, due to limitations in manufacturing processes, existing conventional EDI and electric mixing beds all adopt a double-opening, double-cover design, which leads to a more complex device structure, increased installation workload, and reduced sealing performance. Utility Model Content

[0008] This application provides an electro-mixed bed with a composite metal shell and an insulating inner liner, to solve the problems of large size, limited resin layer height, and insufficient pressure bearing capacity caused by the use of insulating frames or shells alone in traditional devices. It is suitable for high-purity water treatment in industries such as power, electronics, chemical, and papermaking, and is especially suitable for efficient deep desalination in high-flow-rate, relatively poor-quality influent water, and high-pressure scenarios.

[0009] An electric mixed bed with a composite metal shell and an insulating inner liner includes a housing, a cover plate, anode and cathode electrodes, an upper water distribution assembly, a lower water distribution assembly, and an ion exchange resin layer filled between the upper and lower water distribution assemblies; the housing has an opening only at the top and is rectangular in shape inside, with the cover plate covering the opening; the housing adopts a composite structure shell composed of a first insulating inner liner and a metal shell with a first reinforcing rib on the outer wall.

[0010] The enclosure of this application has only one opening at the top, with a cover plate fitting over the opening. The enclosure adopts a composite structure consisting of a reinforced metal outer shell and an insulating inner lining. This application replaces the traditional single-insulating material shell structure with a composite material structure combining a reinforced metal outer shell and an insulating inner lining. While maintaining good insulation performance, this significantly enhances mechanical strength and effectively solves problems such as the difficulty in achieving large-scale operation, limited resin layer height, and insufficient pressure bearing capacity of traditional devices. The processing flow rate of a single unit can be designed to be 8m³ / s according to actual needs. 3 / h to 200m 3 The pressure-bearing capacity of the device can be designed to be any value within the range of / h; the pressure-bearing capacity of the device can be designed to be any value not exceeding 8MPa according to actual needs; the resin filling height has been increased from the traditional less than 0.5m to 0.5-1.5m.

[0011] 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.

[0012] Optionally, the metal casing is a stainless steel casing or a carbon steel casing; the metal casing is manufactured by welding or integral casting; the first insulating inner lining layer is tightly attached to the inner surface of the metal casing by rotational molding, bonding or welding.

[0013] Optionally, the wall thickness of the metal shell is 3~30mm; the thickness of the first insulating inner liner is 2~10mm.

[0014] Optionally, the first reinforcing ribs are provided on the outer side walls and bottom walls of the housing.

[0015] Optionally, the cover plate adopts a composite structure consisting of a second insulating inner lining layer and a metal plate with a second reinforcing rib on the outer wall surface, or is integrally formed using a high mechanical strength insulating material; the cover plate is provided with an upper pipe interface.

[0016] Optionally, the metal plate is a stainless steel plate or a carbon steel plate; the second insulating inner lining layer is tightly attached to the inner surface of the metal plate by rotational molding or adhesive bonding.

[0017] Optionally, the thickness of the metal plate is 6~30mm; the thickness of the second insulating inner liner is 2~10mm.

[0018] Optionally, the high mechanical strength insulating material may be selected from fiberglass, PEEK, and other materials with similar high strength and insulation properties.

[0019] Optionally, the first reinforcing rib and the second reinforcing rib are one or more combinations of steel bars, rectangular steel pipes, angle steel, H-beams or channel steel; they are arranged in a way that is multiple rows of parallel, longitudinal and transverse grids or a combination of borders and multiple rows of parallel.

[0020] Furthermore, the first reinforcing rib is a steel bar or a rectangular steel pipe, which is evenly and crosswise arranged in the vertical and horizontal directions on the outer side of the side wall, or multiple rows of four outer reinforcing ribs arranged in parallel and identical order are used to form multiple parallel and evenly distributed closed loop structures; the bottom plate is evenly and crosswise arranged in the length and width directions; the net spacing between the ribs is about 40-200mm; the second reinforcing rib is a steel bar or a rectangular steel pipe, which is evenly and crosswise arranged in the length and width directions, with a net spacing between the ribs of about 40-200mm.

[0021] Optionally, the first insulating liner and the second insulating liner are both made of one or more insulating materials such as polyethylene, polypropylene, polytetrafluoroethylene, ABS, UPVC, rubber and fiberglass.

[0022] Optionally, the height of the ion exchange resin layer is 0.5-1.5m.

[0023] This application significantly improves the pressure resistance of the device by adopting a composite shell structure of a metal outer shell and an insulating inner liner, enabling the device to be scaled up. The height of the ion exchange resin layer can be increased to 0.5-1.5m, which can significantly relax the requirements for the quality of the influent water, broaden the application range of the device, and eliminate the need to set up an ion exchange membrane between the electrode and the resin layer or to set up other auxiliary components inside the resin layer, significantly simplifying the internal structure of the electro-mixed bed; at the same time, it can significantly reduce the regeneration frequency, which is conducive to improving the water recovery rate and reducing energy consumption.

[0024] Optionally, the positive and negative electrodes are respectively attached to the inner side of one opposite side wall of the housing; the positive and negative electrodes are respectively provided with terminals, and each opposite side wall is provided with a through hole for penetrating the terminals; the upper water distribution assembly is fixed to the lower side of the cover plate; the lower water distribution assembly is fixed to the bottom of the housing; the bottom of the housing is provided with a lower pipe interface that penetrates the bottom plate.

[0025] Two terminals pass through corresponding through holes and connect to their respective electrodes, with the terminals and through holes being insulated and sealed. Optionally, the terminals are secured to the outer wall of the housing with nuts and washers; the terminals and corresponding through holes are sealed with insulating gaskets, O-rings, and / or waterproof sealant. In this application, since the electrodes are no longer located on the water flow channel, either mesh electrodes or plate electrodes are acceptable.

[0026] Optionally, the upper water distribution assembly includes an upper fixing plate, an upper water distribution plate support, an upper porous water distribution plate, and an upper resin retainer stacked sequentially. The upper fixing plate has a water passage hole corresponding to the upper pipe interface. The upper fixing plate, the upper water distribution plate support, the upper porous water distribution plate, and the upper resin retainer are assembled into a whole and fixed to the lower side of the cover plate with the upper resin retainer facing downward. The lower water distribution assembly includes a lower fixed plate, a lower water distribution plate support, a lower porous water distribution plate, and a lower resin retainer stacked sequentially. The lower fixed plate has a water passage hole corresponding to the lower pipe interface. The lower fixed plate, the lower water distribution plate support, the lower porous water distribution plate, and the lower resin retainer are assembled into a whole and fixed to the bottom of the box body with the lower resin retainer facing upward.

[0027] Optionally, the upper water distribution plate support, the upper perforated water distribution plate, and the upper resin retainer are fixed to the upper fixing plate by upper hexagonal bolts.

[0028] Optionally, the exposed head of the upper hex bolt is sealed with waterproof sealant.

[0029] Optionally, the upper resin retainer is in close contact with the upper porous water distribution plate, and the upper water distribution plate support is supported between the upper porous water distribution plate and the upper fixed plate; the upper water distribution plate support includes an edge sealing support located at the edge and other central support members evenly distributed between the upper porous water distribution plate and the upper fixed plate.

[0030] Optionally, the height of the upper water distribution plate support is 20-50mm.

[0031] Optionally, the lower resin retainer, the lower porous water distribution plate, and the lower water distribution plate support are fixed to the lower fixing plate by lower hexagonal bolts.

[0032] Optionally, the exposed head of the lower hexagonal socket head cap is sealed with waterproof sealant.

[0033] Optionally, the lower fixing plate is fixed to the inner lining layer of the bottom plate of the box body by adhesive bonding.

[0034] Optionally, the lower resin retainer is in close contact with the lower porous water distribution plate, and the lower water distribution plate support is supported between the lower porous water distribution plate and the lower fixed plate; the lower water distribution plate support includes an edge sealing support located at the edge and other central support members evenly distributed between the lower porous water distribution plate and the lower fixed plate.

[0035] Optionally, the height of the lower water distribution plate support is 20-50mm.

[0036] In the upper and lower water distribution components: Optionally, the edge sealing support is a frame structure with a height of 20-50mm and a width of 12-20mm, and has M4-M8 bolt holes with a center-to-center spacing of 50-200mm in the vertical direction.

[0037] Optionally, the central support member is a cylinder with an M4-M8 bolt hole in the center, an outer diameter of 12-30mm, and a height of 20-50mm.

[0038] Optionally, both the upper and lower porous water distribution plates are 8-30mm high and have water distribution holes with a center-to-center spacing of 20-30mm and a diameter of 8-20mm.

[0039] Optionally, both the upper and lower resin traps are slotted plates that can effectively trap ion exchange resin particles, with a slot width of 0.3-0.4 mm.

[0040] Regarding the fixing method between the upper fixing plate and the cover plate, optionally, the upper fixing plate can be directly and tightly fixed to the lower side of the cover plate using high-strength insulating bolts and / or waterproof sealant, or the outer edge of the top of the box, the outer edge of the cover plate, and the outer edge of the upper fixing plate can all adopt a rectangular flange structure. An upper sealing gasket and a lower sealing gasket are respectively provided between the upper fixing plate, the cover plate, and the box, and the cover plate, the upper fixing plate, and the box are fastened and sealed by bolt assemblies.

[0041] Optionally, both the upper and lower pipe interfaces adopt a flange structure; the sealing surface of the flange and the inner surface of the pipe section are equipped with an insulating lining.

[0042] Optionally, the bottom of the enclosure has support feet. These support feet are either downward extensions of reinforcing ribs at the corners of the metal outer shell of the enclosure, or are welded to the bottom of the metal outer shell of the enclosure, used to directly and stably support the device on the ground.

[0043] The device in this application employs two operating modes: treatment and electrochemical regeneration. In the processing mode, the water flow path is as follows: upper pipe interface → upper porous water distribution plate → upper resin interceptor → ion exchange resin layer → lower resin interceptor → lower porous water distribution plate → lower pipe interface. In electrochemical regeneration mode, the water flow path is reversed compared to the treatment mode.

[0044] Compared with existing membrane-free electro-deionization devices, this application has at least one of the following advantages: (1) The equipment is scaled up: the flow rate of a single unit can be increased from the existing 8t / h to 8-200t / h, fundamentally solving the limitation of the traditional equipment of "small flow rate and multiple modules". When the total flow rate is 1000t / h, if an electric mixed bed with a single water production capacity of 100t / h is used, the number of units can be reduced from 125 to 10, thereby reducing the number of valves, flow meters, pressure gauges and pipe fittings by 92%, the control system is significantly simplified, and the frame can be eliminated, reducing the system investment cost by more than 30%.

[0045] (2) High pressure condition adaptation: The pressure bearing capacity of up to 8MPa allows the electric mixed bed to be directly connected to the power plant condensate high pressure system to treat the condensate without the need for pressure reduction measures. After treatment, there is no need to increase the pressure again, which saves energy and improves the safety and reliability of the condensate system operation.

[0046] (3) Significantly improved performance: The resin filling height has been increased from less than 0.5m to 0.5-1.5m, which can significantly relax the requirements for the quality of the influent water, broaden the scope of application of the device, and at the same time significantly reduce the regeneration frequency, which is conducive to improving the water recovery rate and reducing energy consumption. Attached Figure Description

[0047] Figure 1 This is a front view of the electric mixed bed of this application.

[0048] Figure 2 This is a top view of the electric mixing bed of this application.

[0049] Figure 3 This is a left view of the electric mixing bed of this application.

[0050] Figure 4 and Figure 5 for Figure 1 Sectional view along the middle II direction.

[0051] The reference numerals in the figure are as follows: 1. Enclosure: 11. Metal outer shell, 12. First insulating inner lining layer, 13. First reinforcing rib, 14. Lower pipe interface, 15. Third insulating inner lining layer, 16. Support feet; 2. Cover plate: 21. Metal cover plate, 22. Second insulating inner lining layer, 23. Second reinforcing rib, 24. Upper pipe interface, 25. Fourth insulating inner lining layer; 3. Upper water distribution assembly: 31. Upper resin retainer, 32. Upper perforated water distribution plate, 33. Upper water distribution plate frame support, 34. Upper water distribution plate center support, 35. Upper fixing plate, 36. Upper hexagon socket bolts; 4. Lower water distribution assembly: 41. Lower resin retainer; 42. Lower perforated water distribution plate; 43. Lower water distribution plate frame support; 44. Lower water distribution plate center support; 45. Lower fixing plate; 46. Lower hexagon socket head cap bolt; 5. Electrodes: 51. Anode, 52. Cathode, 53. Terminal, 54. Through hole, 55. Nut, 56. Washer; 6. Ion exchange resin layer; 7. Install the sealing gasket; 8. Lower sealing gasket; 9. Bolt assembly. Detailed Implementation

[0052] 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.

[0053] 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.

[0054] like Figures 1-5 As shown, an electric hybrid bed with a composite metal shell and an insulating inner liner is described. See also... Figure 1 , Figure 4 and Figure 5The system includes a housing 1, a cover plate 2, an upper water distribution assembly 3, a lower water distribution assembly 4, electrodes 5, and an ion exchange resin layer 6. The housing 1 is a composite housing consisting of a metal outer shell 11 and a first insulating inner lining layer 12. The outer wall of the metal outer shell has a first reinforcing rib 13. The housing has an opening only at the top and is rectangular in shape inside. The housing has a bottom wall, opposing side walls, and a lower pipe interface 14 penetrating the bottom wall of the housing. The upper water distribution assembly 3 is fixed to the lower side of the cover plate 2, and the lower water distribution assembly 4 is fixed to the bottom inside the housing 1. Both the upper water distribution assembly 3 and the lower water distribution assembly 4 are used for water distribution and ion exchange resin retention. The electrodes 5 include an anode 51 and a cathode 52, which are respectively attached to the inner sides of the aforementioned opposing side walls. The ion exchange resin layer 6 is compressed and filled in the space between the upper water distribution assembly 3 and the lower water distribution assembly 4. The cover plate 2 covers the opening of the housing and has an upper pipe interface 24 penetrating the center of the cover plate.

[0055] The enclosure of this application has only one opening at the top, with a cover plate fitting over the opening. The enclosure adopts a composite structure consisting of a metal outer shell with a first reinforcing rib and an insulating inner lining layer tightly bonded together. The metal outer shell is made of stainless steel or carbon steel; the first insulating inner lining layer 12 is made of one or more combinations of insulating materials such as polyethylene, polypropylene, polytetrafluoroethylene, ABS, UPVC, rubber, and fiberglass. The metal outer shell can be manufactured by welding or integral casting, and the first insulating inner lining layer 12 can be tightly attached to the inner surface of the metal outer shell by rotational molding, gluing, or welding. Replacing the traditional single insulating material shell structure with a composite material structure combining a metal outer shell and an insulating inner lining layer significantly enhances mechanical strength while maintaining good insulation performance.

[0056] The outer surface of the metal casing 11 has a first reinforcing rib 13. In some embodiments, the first reinforcing rib 13 is distributed on both the outer side wall and the outer side of the bottom plate of the casing. See [link to relevant documentation]. Figures 1-3 As one embodiment of the reinforcing rib, the first reinforcing rib 13 can be one or more combinations of steel bars, rectangular steel pipes, angle steel, H-beams, or channel steel, and can be arranged in multiple rows of parallel, longitudinal and transverse grids, or a combination of borders and multiple rows of parallel ribs. In some embodiments, the first reinforcing rib is a rectangular steel pipe or steel bar, evenly intersecting in the vertical and horizontal directions on the outer side of the side wall, and evenly intersecting in the length and width directions on the outer side of the bottom plate, with a net spacing of approximately 40-200 mm between the ribs.

[0057] The bottom of the housing 1 has a support foot 16. In some embodiments, the support foot 16 is a downward extension of the reinforcing rib at the corner of the metal shell of the housing, used to directly and stably support the device on the ground.

[0058] In some embodiments, the cover plate may be a composite structure consisting of a second insulating inner liner and a metal plate with a second reinforcing rib on the outer wall surface; in other embodiments, the cover plate may be integrally formed from a high-mechanical-strength insulating material. For embodiments employing a composite structure of a metal plate and an insulating inner liner, see [link to documentation]. Figure 5 The metal plate 21 is made of stainless steel or carbon steel, and the outer wall of the metal plate 21 has a second reinforcing rib 23; the second insulating inner lining layer 22 is made of one or more of insulating materials such as polyethylene, polypropylene, polytetrafluoroethylene, ABS, UPVC, rubber and fiberglass, and can be tightly attached to the inner surface of the metal plate 21 by rotational molding or adhesive bonding.

[0059] The second reinforcing rib 23 can be one or more combinations of steel bars, rectangular steel pipes, angle steel, H-beams, or channel steel, and can be arranged in multiple rows of parallel, longitudinal and transverse grids, or a combination of borders and multiple rows of parallel ribs. In some embodiments, the second reinforcing rib is a steel bar or rectangular steel pipe, evenly and crosswise arranged along the length and width directions, with a net spacing of approximately 40-200 mm between ribs.

[0060] In some embodiments, the wall thickness of the metal casing is 3-30 mm, and the thickness of the metal plate is 6-30 mm; the thicknesses of the first insulating liner and the second insulating liner are 2-10 mm, respectively. Within this thickness range, the mechanical strength and insulation performance of the device can be better balanced.

[0061] As one embodiment of the enclosure, the enclosure can be a vertical rectangular box with an open top, a bottom wall, and two pairs of opposing side walls. Electrodes 5, including an anode 51 and a cathode 52, are disposed on the inner side of one of the opposing side walls, respectively, and are tightly fixed to the surface of the first insulating inner lining layer of the corresponding side wall. Both side walls with electrodes have through holes 54, and two terminals 53 pass through the corresponding through holes and connect to the corresponding electrodes. The terminals are secured to the outer wall of the enclosure with nuts 55 and insulating washers 56. The terminals are sealed to the corresponding through holes using insulating gaskets, O-rings, and / or waterproof sealant. The electrodes can be either mesh electrodes or plate electrodes.

[0062] The upper water distribution assembly 3 and the lower water distribution assembly 4 are located at the open end of the tank and the bottom of the tank, respectively.

[0063] See Figure 5The upper water distribution assembly 3 includes an upper resin retainer 31, an upper porous water distribution plate 32, an upper water distribution plate support (upper water distribution plate frame support 33 and upper water distribution plate center support 34), and an upper fixing plate 35. The upper fixing plate 35 has water passage holes corresponding to the upper pipe interface 24. The upper fixing plate 35, the upper water distribution plate support (upper water distribution plate frame support 33 and upper water distribution plate center support 34), the upper porous water distribution plate 32, and the upper resin retainer 31 are stacked and assembled into a whole and installed at the open end of the box with the upper resin retainer 31 facing downward. The upper fixing plate 35 is tightly connected to the cover plate 2. In some embodiments, the outer edge of the top of the box 1, the outer edge of the cover plate 2, and the outer edge of the upper fixing plate 35 all adopt a rectangular flange structure. An upper sealing gasket 7 and a lower sealing gasket 8 are respectively provided between the upper fixing plate 35, the cover plate 2, and the box 1. The cover plate 2, the upper fixing plate 35, and the box 1 are fastened and sealed by bolt assembly 9.

[0064] In one assembly method of the upper water distribution assembly 3, the upper resin retaining member 31 is tightly attached to the upper porous water distribution plate 32. An upper water distribution plate support is positioned between the upper porous water distribution plate 32 and the upper fixed plate 35. The upper resin retaining member 31, the upper porous water distribution plate 32, and the upper water distribution plate support (upper water distribution plate edge support 33 and upper water distribution plate center support 34) are fixed to the upper fixed plate 35 by upper hexagonal socket head cap screws 36. The exposed heads of the hexagonal socket head cap screws are sealed with waterproof sealant. The upper water distribution plate support includes an upper water distribution plate edge sealing support 33 located at the edge and other upper water distribution plate center support 34 evenly distributed between the upper porous water distribution plate and the upper fixed plate. The height of the upper water distribution plate support is 20-50mm.

[0065] See Figure 5 The lower water distribution assembly 4 includes a lower fixing plate 45, a lower water distribution plate support (lower water distribution plate frame support 43 and lower water distribution plate center support 44), a lower porous water distribution plate 42, and a lower resin retainer 41. The lower fixing plate 45 has water passage holes corresponding to the lower pipe interface 14. The lower fixing plate 45, the lower water distribution plate support (lower water distribution plate frame support 43 and lower water distribution plate center support 44), the lower porous water distribution plate 42, and the lower resin retainer 41 are sequentially stacked and assembled into a whole and fixed to the bottom of the box with the lower resin retainer 41 facing upward. The lower fixing plate 45 is tightly connected to the bottom of the box.

[0066] In one assembly method of the lower water distribution assembly 4, the lower resin retainer 41 is tightly attached to the lower porous water distribution plate 42. The lower water distribution plate support is positioned between the lower porous water distribution plate 42 and the lower fixed plate 45. The lower resin retainer 41, the lower porous water distribution plate 42, and the lower water distribution plate support (lower water distribution plate edge support 43 and lower water distribution plate center support 44) are fixed to the lower fixed plate 45 by lower hexagonal socket head cap screws 46. The exposed heads of the hexagonal socket head cap screws are sealed with waterproof sealant. The lower fixed plate 45 is bonded to the inner lining layer of the bottom plate of the housing 1. The lower water distribution plate support also includes the lower water distribution plate edge sealing support 43 located at the edge and other lower water distribution plate center support 44 evenly distributed between the lower porous water distribution plate and the lower fixed plate. The height of the lower water distribution plate support is 20-50mm.

[0067] In some embodiments, in the upper water distribution assembly 3 and the lower water distribution assembly 4: the edge-sealing support is a frame structure, 20-50mm high and 12-20mm wide, with M4-M8 bolt holes with a center-to-center spacing of 50-200mm in the vertical direction; the central support is a cylinder with an outer diameter of 12-30mm and a height of 20-50mm, with M4-M8 bolt holes in the center; the upper and lower porous water distribution plates are 8-30mm high, with water distribution holes with a center-to-center spacing of 20-30mm and a diameter of 8-20mm; the upper resin interceptor 31 and the lower resin interceptor 41 are slotted plates that can effectively intercept ion exchange resin particles, with a slot width of 0.3-0.4mm.

[0068] Ion exchange resin is compressed and filled between the upper water distribution component 3 and the lower water distribution component 4 to form an ion exchange resin layer 6. The height of the space between the upper and lower water distribution components is 0.5~1.5m, and the height of the fillable ion exchange resin layer 6 is 0.5-1.5m. The ion exchange resin is a mixed cation and anion ion exchange resin.

[0069] The top of the cover plate 2 and the bottom of the box body 1 are respectively provided with an upper pipe interface 24 and a lower pipe interface 14. In some embodiments, both adopt a flange structure. All flange sealing surfaces and the inner side of the pipe section are provided with insulating linings (third insulating lining 15 and fourth insulating lining 25).

[0070] The device employs two operating modes: treatment and electrochemical regeneration. In the treatment mode, the water flow path is as follows: upper pipe interface 24 → upper porous water distribution plate 32 → upper resin retainer 31 → ion exchange resin layer 6 → lower resin retainer 41 → lower porous water distribution plate 42 → lower pipe interface 14. The water flows from top to bottom through the ion exchange resin layer, relying on the strong exchange adsorption capacity of the ion exchange resin to remove ionic substances in the water. The treated purified water is discharged from the lower pipe interface.

[0071] In electrochemical regeneration mode, the water flow path is reversed compared to the treatment mode. The electrodes are connected to the positive and negative terminals of a DC power supply, respectively. The purified water flows from bottom to top through the ion exchange resin layer. At the same time, a strong DC current is applied to the resin layer, causing the ions adsorbed in the resin to quickly flow from the inside of the resin into the water flow. As a result, the anion and cation resins are regenerated efficiently.

[0072] Example 1 A process with a flow rate of 100m 3 An electric mixed bed with a capacity of 0.8 MPa and a pressure of [unspecified unit] is suitable for treating steam condensate in boiler feedwater and chemical industries, with a maximum permissible influent conductivity of approximately 20 μS / cm. The technical solution of this embodiment is as follows: Box structure: The effective internal space dimensions of the enclosure are length × width × height = 1000mm × 1000mm × 950mm, and the resin layer filling height is 800mm. It is a composite structure made of a metal shell welded from carbon steel plate and a polyethylene first insulation inner liner tightly bonded together. The thickness of the steel plate of the metal shell is 10mm, and the thickness of the polyethylene first insulation inner liner is 8mm. They are integrated with the inside of the metal shell through rotational molding process.

[0073] The outer edge of the top opening of the enclosure is an integrated rectangular flange structure with an edge width of 120mm and a thickness of 60mm, which is seamlessly welded to the main body of the enclosure. The flange surface is machined flat, with M40 bolt holes pre-drilled and evenly distributed. The flange sealing surface is covered with a polyethylene liner with a thickness of about 5mm.

[0074] The first reinforcing rib of the metal shell is configured as follows: rectangular steel pipes are used, and they are evenly and crosswise arranged in the vertical and horizontal directions; the corner reinforcing ribs extend downwards by 450mm to form support feet, and the bottom is welded with 30mm thick steel plate pads.

[0075] Cover plate structure: The cover plate is a 20mm thick carbon steel plate, and the outer edge is equipped with a rectangular flange structure that matches the flange of the box body.

[0076] The second reinforcing rib of the cover plate is made of rectangular steel pipes arranged in a grid pattern.

[0077] The second insulating liner of the cover plate is made of 8mm thick polyethylene, which is applied to the inside of the carbon steel plate by rotational molding.

[0078] Pipe joints: The top of the cover plate and the bottom of the box are respectively equipped with DN125 water pipe interfaces, which adopt flange interfaces. The flange sealing surface and the inside of the pipe are equipped with a polyethylene insulation lining with a thickness of about 5mm.

[0079] Internal components: Upper and lower edge sealing support frames: Made of PP material, with M6 bolt holes drilled vertically, and the bolt hole spacing is approximately 75mm.

[0080] Upper / lower multi-hole water distribution plate: made of PP material, with 18mm diameter water distribution holes and a center-to-center spacing of about 30mm.

[0081] Upper / lower center support: A cylindrical body with an M6 bolt hole in the center, with an outer diameter of 25mm, made of PP, and the center-to-center distance between the cylinders is about 100mm, used to stably support the perforated water distribution plate.

[0082] Upper / lower fixing plate: Made of fiberglass, with a circular water passage hole of about 115mm in diameter in the center, used to fix the multi-hole water distribution plate and resin retainer and other accessories.

[0083] Electrodes: The two opposite side walls of the enclosure are respectively provided with through holes A and B with a diameter of approximately 30.2mm; both electrodes are flat electrodes, with the anode being a titanium-based DSA type electrode and the cathode being a 316L stainless steel electrode, which are respectively installed in close contact with the inner side wall where the through holes are located; the electrode terminals are seamlessly connected to the electrodes by electric welding, and the electrode terminals (with M30 threads) pass through the through holes, and are fastened to the outer wall of the enclosure with nuts and washers; the back of the electrode and the corresponding insulating inner lining surface, as well as the electrode terminals and the corresponding through holes, are sealed with insulating waterproof sealant.

[0084] Example 2 A process with a flow rate of 35m 3 An electro-mixed bed reactor with a capacity of 4.0 MPa and a pressure of / h, used for condensate treatment in power plants. The technical solution of this embodiment is as follows: Box structure: The effective internal space dimensions of the enclosure are 600mm × 600mm × 1000mm (length × width × height), with a resin layer filling height of 850mm. It is a composite structure made of a metal shell welded from carbon steel plate and a polyethylene first insulation liner tightly bonded together. The metal shell steel plate is 25mm thick, and the polyethylene first insulation liner is 8mm thick. They are integrated with the inside of the metal shell through a rotational molding process.

[0085] The outer edge of the top opening of the enclosure is an integrated rectangular flange structure with an edge width of 150mm and a thickness of 100mm, which is seamlessly welded to the main body of the enclosure. The flange surface is machined flat, with M45 bolt holes pre-drilled and evenly distributed. The flange sealing surface is covered with a polyethylene liner with a thickness of about 5mm.

[0086] The first reinforcing rib of the metal shell is made of steel bars arranged in a grid pattern.

[0087] Cover plate structure: The cover plate is a 30mm thick carbon steel plate, and the outer edge is equipped with a rectangular flange structure that matches the flange of the box body.

[0088] The second reinforcing rib of the cover plate is made of steel bars arranged in a grid pattern.

[0089] The second insulating inner lining is made of 8mm thick polyethylene, which is applied to the inside of the carbon steel plate by rotational molding.

[0090] Pipe joints: The top of the cover plate and the bottom of the box are respectively equipped with DN80 water pipe interfaces, which adopt flange interfaces. The flange sealing surface and the inside of the pipe are equipped with a polyethylene insulation lining with a thickness of about 5mm.

[0091] Internal components: Upper and lower edge sealing support frames: Made of PP material, with M6 bolt holes drilled vertically, and the bolt hole spacing is approximately 75mm.

[0092] Upper / lower multi-hole water distribution plate: made of PP material, with 18mm diameter water distribution holes and a center-to-center spacing of about 30mm.

[0093] Upper / lower center support: A cylindrical body with an M6 bolt hole in the center, with an outer diameter of 25mm, made of PP, and the center-to-center distance between the cylinders is about 100mm, used to stably support the perforated water distribution plate.

[0094] Upper / lower fixing plate: Made of fiberglass, with a circular water passage hole of about 70mm in diameter in the center, used to fix the multi-hole water distribution plate and resin retainer and other accessories.

[0095] Electrodes: The two opposite side walls of the enclosure are respectively provided with through holes A and B with a diameter of approximately 20.2mm; both electrodes are flat electrodes, with the anode being a titanium-based DSA type electrode and the cathode being a 316L stainless steel electrode, which are respectively installed tightly against the inner side wall where the through holes are located; the electrode terminals are seamlessly connected to the electrodes by electric welding, and the electrode terminals (with M20 threads) pass through the through holes, and are fastened to the outer wall of the enclosure with nuts and washers; the back of the electrode and the corresponding surface of the insulating inner lining layer, as well as the electrode terminals and the corresponding through holes, are sealed with insulating waterproof sealant.

[0096] 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 utility model 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 electro-mixed bed composed of a metal shell and an insulating inner liner, comprising a housing, a cover plate, anode and cathode electrodes, an upper water distribution assembly, a lower water distribution assembly, and an ion exchange resin layer filled between the upper and lower water distribution assemblies; characterized in that, The box body has an opening only at the top, and the interior is rectangular. The cover plate closes to the opening. The box body is a composite structure shell composed of a first insulating inner lining layer and a metal outer shell with a first reinforcing rib on the outer wall.

2. The electric mixed bed according to claim 1, characterized in that, The metal outer shell is a stainless steel shell or a carbon steel shell; the metal outer shell is manufactured by welding or integral casting; the first insulating inner lining layer is tightly attached to the inner surface of the metal outer shell by rotational molding, bonding or welding.

3. The electric mixed bed according to claim 1, characterized in that, The metal outer shell has a wall thickness of 3-30 mm; the first insulating inner lining layer has a thickness of 2-10 mm.

4. The electro-mixed bed according to claim 1, characterized in that, The cover plate is a composite structure consisting of a second insulating inner lining and a metal plate with a second reinforcing rib on the outer wall, or it is integrally formed using a high mechanical strength insulating material; the cover plate is provided with an upper pipe interface.

5. The electro-mixed bed according to claim 4, characterized in that, The metal plate is a stainless steel plate or a carbon steel plate; the second insulating inner lining layer is tightly attached to the inner surface of the metal plate by rotational molding or adhesive bonding.

6. The electro-mixed bed according to claim 4, characterized in that, The thickness of the metal plate is 6~30mm; the thickness of the second insulating inner liner is 2~10mm.

7. The electro-mixed bed according to claim 1 or 4, characterized in that, Both the first and second reinforcing ribs are one or more combinations of steel bars, rectangular steel pipes, angle steel, H-beams or channel steel; they are arranged in a multi-row parallel grid pattern or a combination of a frame and multiple rows of parallel ribs.

8. The electric mixed bed according to claim 1, characterized in that, The height of the ion exchange resin layer is 0.5-1.5m.

9. The electric mixed bed according to claim 1, characterized in that, The positive and negative electrodes are respectively attached to the inner side of one opposite side wall of the housing; the positive and negative electrodes are respectively provided with terminals, and each opposite side wall is provided with a through hole for penetrating the terminals; the upper water distribution assembly is fixed to the lower side of the cover plate; the lower water distribution assembly is fixed to the bottom of the housing; the bottom of the housing is provided with a lower pipe interface that penetrates the bottom plate.

10. The electro-mixed bed according to claim 1 or 9, characterized in that, The upper water distribution assembly includes an upper fixed plate, an upper water distribution plate support, an upper porous water distribution plate, and an upper resin retainer stacked sequentially. The upper fixed plate has a water passage hole corresponding to the upper pipe interface. The upper fixed plate, the upper water distribution plate support, the upper porous water distribution plate, and the upper resin retainer are assembled into a whole and fixed to the lower side of the cover plate with the upper resin retainer facing downward. The lower water distribution assembly includes a lower fixed plate, a lower water distribution plate support, a lower porous water distribution plate, and a lower resin retainer stacked sequentially. The lower fixed plate has a water passage hole corresponding to the lower pipe interface. The lower fixed plate, the lower water distribution plate support, the lower porous water distribution plate, and the lower resin retainer are assembled into a whole and fixed to the bottom of the box body with the lower resin retainer facing upward.

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