CN218475125U

CN218475125U - Electrodialysis composite partition plate

Info

Publication number: CN218475125U
Application number: CN202122467624.2U
Authority: CN
Inventors: 朱缨
Original assignee: Jiande Lanxin Environmental Science And Technology Co ltd
Current assignee: Jiande Lanxin Environmental Science And Technology Co ltd
Priority date: 2021-10-12
Filing date: 2021-10-12
Publication date: 2023-02-14
Anticipated expiration: 2031-10-12

Abstract

The utility model relates to a compound baffle of electrodialysis specifically indicates a part among bipolar membrane electrodialysis device. The utility model comprises a plate frame body, liquid guide holes and a plate core partition, wherein at least one liquid guide hole is a circular liquid guide hole and is positioned at the central position of the plate frame body; 3-5 liquid guide holes are arranged on the periphery of the plate frame body; a plate heart partition is arranged in the inner cavity of the plate frame body; the film is attached to the surfaces of the two sides of the plate frame body, and the thickness of the film is 0.05-0.12mm. The utility model has the advantages that the plate core separation net is a PP elastic separation net with the same thickness as the partition plate and good elasticity, and the welding temperature is 85-95 ℃; due to the above advantages, the separator can be suitable for heterogeneous membranes, homogeneous membranes and bipolar membranes of electrodialysis.

Description

Electrodialysis composite partition plate

Technical Field

The utility model relates to an electrodialysis device specifically indicates a part among bipolar membrane electrodialysis device.

Background

The partition plates of the conventional electrodialyzer are generally of a flat frame plate type structure. The water-saving device is provided with a hollow frame, a separation net is arranged in the frame, two ends of the frame are respectively and uniformly distributed with dense square or round water channels, and the center distance between adjacent water channels is generally less than 50 mm. The water channel at one end of the frame is a water inlet channel, the water channel at the other end of the frame is a water outlet channel, a plurality of water distribution channels connected with the middle separation net are alternately arranged on the water channel at each end, and the water inlet channels are staggered with the water distribution channels arranged on the water outlet channels at the opposite sides. One surface of the clapboard is covered with an anion exchange membrane, the other surface is covered with a cation exchange membrane, holes corresponding to the liquid guide holes on the clapboard are respectively arranged at the two ends of the anion exchange membrane and the cation exchange membrane, but the hole diameter of the hole is equal to the large liquid guide hole on the clapboard. The electrodialyzer is formed by sequentially overlapping partition plates, ion exchange membranes, reverse partition plates, ion exchange membranes (8230) \ 8230and membrane stacks (membrane pairs) which are formed by sandwiching a partition plate between each pair of anion and cation exchange membranes, wherein the space in the membrane pair is a fresh water chamber or a concentrated water chamber, the partition plates and corresponding liquid guide holes and holes on the ion exchange membranes are overlapped in series to form liquid guide tubes of the concentrated and fresh water chambers, and positive and negative electrode plates are added at two ends of the membrane stacks.

The above-mentioned conventional electrodialyser separators have the following drawbacks:

1. during processing, the surface of the separator is easy to deform or be uneven, so that the sealing property between the separator and the ion exchange membrane is influenced to cause the leakage of concentrated water and fresh water, particularly when the concentration ratio is high;

2. the ion exchange membrane is easy to sink into each water distribution flow channel during operation to cause cross leakage, particularly the influence of the bipolar membrane device is more obvious, and the concentration of acid or alkali of the bipolar membrane is difficult to increase due to the cross leakage;

3. because the processing site can not be completely flat or the elasticity is not enough when the surface of the separator is processed, the concentrated solution is easy to leak to the outside of the membrane stack, which is a common fault of almost all the existing separators;

4. most of the separators are only suitable for heterogeneous electrodialysis membranes, and are not suitable for homogeneous membranes or bipolar membranes because the homogeneous membranes or the bipolar membranes are easily damaged when the pressure of membrane stack clamping plates is relatively high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electrodialysis baffle that water distribution uniform resistance is little, the circulation is big to the structure to current electrodialysis baffle carries out technological improvement to. The technical solution of the utility model is that: it is composed of a plate frame body, a plate core separation net, a liquid guide hole and a water distribution flow passage. The drainage is arranged at the center of the plate frame body and the periphery of the partition plate; the plate frame material is made of PP elastic material; the elastic layers are compounded on the two surfaces of the plate frame.

The utility model discloses a can realize through following technical scheme:

an electrodialysis composite partition board comprises a board frame body, liquid guide holes and a board core partition, and is characterized in that at least one liquid guide hole is a circular liquid guide hole and is positioned in the center of the board frame body; 3-5 liquid guide holes are arranged on the periphery of the plate frame body; a plate heart partition is arranged in the inner cavity of the plate frame body; the film is attached to the surfaces of the two sides of the plate frame body, and the thickness of the film is 0.05-0.12mm. When the plate frame body and the plate core are the same in thickness, the sealing effect is better.

Preferably, the films on the two side surfaces of the plate frame body are a layer of poly hexatriene polymer material, and the thickness of the film is 0.1 mm.

Because the flow channel is narrow and the flow speed is high inside the combiner formed by the electrodialysis membrane stack, the mechanical effect of the fluid caused by the design change of the flow channel is different. Finding the conventional problems of being more beneficial to the liquid flow of the combiner and preventing liquid leakage and the like from a tiny design space plays a very important role.

The utility model has the advantages that:

1. by adopting a laser cutting method, the processing size of the PP partition plate is more precise, accurate and flat, and the design effectively solves the problem of internal leakage;

2. the total thickness of the partition board is 0.5-0.7mm, wherein the PP sheet is 0.3-0.5mm, and the coating of the polyhexamethylene triene polymer material on the two surfaces is 0.05-0.12mm. The thickness of the partition plate is effective in reducing the resistance of the cells;

3. the adopted plate core separation net is a PP elastic separation net with the thickness the same as that of the partition plate and good elasticity, and the welding temperature is 85-95 ℃;

4. the baffle plate prepared by the integral method does not need to be welded, so that the defects of uneven welding and weak firmness are overcome;

5. the partition board can be used in a cylindrical electrodialysis membrane group device, so that the electrodialysis membrane group device can bear higher operation pressure; the electrodialysis membrane group device with a rectangular structure cannot resist high pressure; therefore, in order to solve the problem of high voltage in use, the rectangular structure cannot be used under the high voltage condition;

6. the water flows flow out from the center of the area to the periphery, so that the uniform distribution of the flowing water is realized;

due to the above advantages, the separator can be suitable for heterogeneous membranes, homogeneous membranes and bipolar membranes of electrodialysis.

Drawings

FIG. 1 is a schematic diagram of the structure of a bipolar membrane electrodialysis separator;

1. liquid guide hole 2, plate core partition 3 and plate frame body

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

the plate frame body of the partition plate is made of a PP thin plate with the thickness of 0.35 mm; the plate center separation net adopts a PP elastic separation net special for a flow channel, 5 liquid guide holes 1 are formed in the center of the plate surface and the circumference of the outer frame, and the plate frame body 3 is circular. The shape is cut by laser to obtain the PP clapboard with flat surface and accurate size, films are arranged on two surfaces, the films are used for coating poly hexatriene high polymer materials, the pressure of a flattening machine is 20 tons, the thickness is 0.1mm respectively, the total thickness of the clapboard is 0.7mm, and the welding temperature of the plate core net is 88 ℃.

In order to obtain better effect of the liquid guide holes in liquid distribution, the liquid guide holes are formed by stringing a central pipe in the stacking process of the membrane stack, the central pipe is provided with a pore passage corresponding to the partition plate, and sealing layers can be sequentially placed on the central pipe for preventing liquid stringing among the partition plates of different layers. Meanwhile, the design structure can also form different flow channel passages for the concentrated water chamber and the fresh water chamber by the combiner consisting of the membrane stacks.

Example 1

Domestic homogeneous ion exchange membranes are used, 20 pairs of anion and cation membranes with the diameter of 200mm are used, and the size of the designed separator is 200mm. The thickness of the coating film is 0.1mm, and the total thickness of the separator is 0.7mm.

The membrane and the partition plate are stacked according to the order of the bipolar membranes of the two compartments, the electrodes are ruthenium iridium titanium electrodes, 2 cm-thick organic glass is used as a clamping plate, the clamping plate is reinforced by stainless steel bolts, the torque force of a wrench for clamping the bolts is 23.0N.m, and the membrane stack is prepared.

The test shows that the external leakage is 0, the internal leakage is 0, and the electrodialysis efficiency is 95%.

Example 2

Domestic homogeneous ion exchange membranes are used, 80 pairs of anion and cation membranes with the diameter of 800mm are used, and the size of the designed partition plate is 160, and is also 800mm. The thickness of the thin film coating is 0.1mm, and the total thickness of the separator is 0.7mm.

The membrane and the partition plates are stacked according to the order of the bipolar membrane of the 2 compartments, the electrodes are ruthenium iridium titanium electrodes, a PVC plate with the thickness of 3cm and stainless steel are used as clamping plates, the clamping plates are reinforced by stainless steel bolts, the torque force of a wrench used for fastening the bolts is 35N.m, and the membrane stack is prepared.

The test shows that the external leakage is 0, the internal leakage is 0, and the electrodialysis efficiency is 96%.

Example 3

The domestic homogeneous ion exchange membranes are used, 50 pairs of anion and cation membranes with the diameter of 400mm are used, and the designed separator has 100 pieces and the size of 400mm. The thickness of the coating is 0.2mm, and the total thickness of the separator is 0.9mm.

The membrane and the partition plate are stacked according to the order of 2-compartment bipolar membrane, ruthenium iridium titanium electrode is used as the electrode, a PVC plate and stainless steel with the thickness of 3cm are used as clamping plates, the clamping plates are reinforced by stainless steel bolts, the wrench torque force for fastening the bolts is 40.0N.m, and the membrane stack is prepared.

Claims

1. An electrodialysis composite partition plate comprises a plate frame body (3), liquid guide holes (1) and a plate core partition plate (2), and is characterized in that at least one liquid guide hole (1) is a circular liquid guide hole and is positioned in the center of the plate frame body (3); 3-5 liquid guide holes (1) are arranged on the periphery of the plate frame body (3); a plate heart separator (2) is arranged in the inner cavity of the plate frame body (3); a layer of film is attached to the surfaces of the two sides of the plate frame body (3), and the thickness of the film is 0.05-0.12mm; the thickness of the plate frame body (3) is the same as that of the plate core spacer (2);

the water flow flows out from the center of the area to the periphery; in the membrane stack, a central pipe is provided with a pore passage corresponding to the partition plate, and a sealing layer for separating liquid between different layers of partition plates is sequentially placed on the central pipe.