Electrodialysis partitioning plate

Abstract

The invention discloses an electrodialysis partitioning plate which comprises a plate frame, wherein liquid guide holes and water distribution channels for communicating the liquid guide holes with a central cavity of the plate frame are formed in the plate frame; each water distribution channel is at least divided into two sections; multiple sections of the water distribution channels are arranged on two side surfaces of the plate frame in a cross manner; two adjacent sections of the water distribution channels are communicated through the through holes in the plate frame. As each water distribution channel is divided into multiple sections, and the sections are arranged on the two side surfaces in the cross manner, the sealing capability of an ion exchange film and the partitioning plate is improved under the condition that the same number of water distribution channels are formed.

Description

technical field [0001] The invention relates to the technical field of electrodialysis, in particular to an electrodialysis separator. Background technique [0002] Electrodialysis is a kind of membrane separation technology. It uses the potential difference as the driving force under the action of a direct current electric field to separate the electrolyte from the solution by using the selective permeability of the ion exchange membrane, thereby realizing the desalination and concentration of the solution. , refined or purified. The electrodialysis separator is one of the necessary parts of the electrodialysis device. Its function is to directly create a certain gap between the anion membrane and the anode membrane to form a concentration compartment, and provide the water flow and current of the compartment for the normal operation of the electrodialysis unit. conduction. [0003] Generally speaking, when designing an electrodialysis separator, the following two factors...

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Problems solved by technology

This patent reduces the number and density of water distribution channels to prevent the selective membrane from sinking and leaking when it is attached to the separator. Because the water distribution channels are reduced, the processing capacity of the device is also greatly reduced

[0007] 2. Energy loss caused by leakage current. During the normal operation of the electrodialysis device, there is also a certain current in the water flow in the water distribution channel. This part of the current (called leakage current or parasitic current) does not contribute to desalination, but causes There is a certain relationship between the energy loss and the current size and the length of the water distribution channel (Ge Daocai, translated by Ren Qingchun, Basic Principles and Applications of Ion Exchange Membranes, pp194-199), the shorter the water distribution channel, the greater the leakage current, and the electrodialysis device The lower the current efficiency, the greater the energy loss

The partition does extend the length of the water distribution channel, but at the same time reduces the area of ​​the water channel in the center of the partition, resulting in a decrease in the effective area of ​​the membrane (the effective area of ​​the electrodialysis membrane is the area of ​​the water flow in the partition), and the equipment cost increase

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