Rolling type continuous electrodeionization device

Abstract

The invention discloses a rolling type continuous electrodeionization device. A cylindrical shell is included; end covers are arranged on the upper end and lower end of the shell; a center tube is coaxially arranged within the center of the shell; the upper and lower end covers sheath on the top and bottom of the center tube; membrane cores comprising of a plurality of anion and cation exchange membrane layers in alternating arrangement and corresponding supporting materials is arranged between the center tube and the shell; the anion and cation exchange membranes separate concentrated waters chamber and freshwater chambers; the freshwater chamber is filled with ion exchange resin; and an electrode plate is disposed between the shell and the outermost membrane core; the center tube is set as on pole of the electrode, and the electrode plate is set as a corresponding other pole; the end cover includes inner covers and outer covers, the inner covers are on the inner sides of the outer covers, and the outer covers are positioned in the end of the shell; the end inner wall of the shell is provided with a loop of spacing grooves, and stoppers are arranged in the spacing grooves. The retainer ring stoppers arranged in the shell can prevent axial displacement of the end covers, and avoid the leakage of components.

Description

technical field [0001] The invention relates to the technical field of electrodeionization, and particularly discloses a roll-type continuous electrodeionization device. Background technique [0002] Electrodeionization (Electrodeionization), referred to as EDI, is a pure water manufacturing technology that combines ion exchange technology and electrodialysis technology. The Electrodeionization (EDI) system is mainly a scientific water treatment technology that uses the selective permeation of ions by the exchange membrane to purify the water quality through the directional movement of the dielectric ions in the water passing through the separator under the action of a DC electric field. . Between a pair of electrodes of the electrodeionization device, there are usually multiple sets of negative membranes, positive membranes and separators (A, B) alternately arranged to form a concentrated chamber and a dilute chamber (that is, cations can permeate the cation membrane, ...

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Problems solved by technology

[0004] However, there are relatively few researches on the anti-leakage of electrodeionization devices, especially the improved technology for the anti-leakage of circular continuous electrodeionization devices

In the installation process of the components of the existing large-scale EDI device, when the end cover is pressed into the shell, due to the uneven force on the center and the periphery, the phenomenon of flanging around the end cover occurs, resulting in component leakage; There are several protruding claws on the four sides, and several positioning slots are set on the inside of the corresponding housing. When installing, after the end cover is inserted into the housing, rotate to fix the protruding claws in the positioning slots, thereby avoiding the phenomenon of flanging around the end cover. , but when this structure rotates, it is easy to squeeze, deform or even rupture the sealing ring to cause water leakage, and large disassembly tools and devices are required for disassembly, which is time-consuming and labor-intensive

[0005] In addition, the electrode structure of the existing electric desalter assembly is mainly a whole electrode plate, which is expensive, and it is not easy to bend when rolled into a cylindrical structure, which affects the uniformity of the electric field distribution. Plastic grids are needed, and the plastic grids are easily squeezed and deformed during the long-term operation of the components, which affects the working efficiency of the components

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