Membrane stack with self-cleaning device and electrodialysis equipment

Abstract

The utility model discloses a membrane stack with a self-cleaning device and electrodialysis equipment, and belongs to the field of electrodialysis equipment, and the membrane stack with the self-cleaning device comprises a membrane stack body, the positive water distribution plate and the negative water distribution plate are respectively propped against two sides of the membrane stack body; the spraying assembly comprises a grating plate, a water supply unit and a plurality of nozzles, the nozzles are connected to the periphery of the grating plate and all communicated with the water supply unit, the grating plate is located in the membrane stack body, and the water supply unit and the nozzles are all located outside the membrane stack body. The utility model has the technical effects that not only is the cleaning comprehensiveness good, but also the occupied space of the nozzle supporting part is small.

Description

Technical Field

[0001] The utility model relates to electrodialysis equipment, in particular to a membrane stack with a self-cleaning device and the electrodialysis equipment. Background Art

[0002] Electrodialysis equipment is a device that separates charged substances from solution based on electrochemical principles under the action of a DC electric field.

[0003] The membrane stack is an important component of the electrodialysis equipment. Since the membrane stacks of related electrodialysis equipment are all flat membrane structures, whether screw locking or hydraulic locking is used, it will cause a certain amount of seepage and leakage. As the water evaporates, moist crystals of alkali or salt will form on the surface of the membrane stack, causing a conductive circuit to be formed between the positive and negative poles of the membrane stack, thereby generating heat and causing the membrane stack to burn.

[0004] In order to solve the above problems, a cleaning device is generally used to clean the membrane stack. However, the cleaning comprehensiveness of the relevant cleaning device is poor, which may easily lead to poor cleaning thoroughness. At the same time, the nozzle support components of the relevant cleaning device occupy a large space, which may easily occupy the installation and maintenance channels of the membrane stack, seriously affecting the installation and maintenance of the membrane stack. Utility Model Content

[0005] Purpose of the utility model: The purpose of the utility model is to provide a membrane stack with a self-cleaning device, which not only has good cleaning comprehensiveness, but also has a small occupied space of its nozzle support component; another purpose of the utility model is to provide an electrodialysis device.

[0006] Technical solution:

[0007] A membrane stack with a self-cleaning device, comprising:

[0008] Membrane stack body;

[0009] A positive electrode water distribution plate and a negative electrode water distribution plate respectively abutting against two sides of the membrane stack body;

[0010] A spray assembly, the spray assembly includes a grille plate, a water supply unit and a plurality of nozzles, the plurality of nozzles are connected to the four sides of the grille plate, the plurality of nozzles are connected to the water supply unit, the grille plate is located in the membrane stack body, the water supply unit and the plurality of nozzles are located outside the membrane stack body.

[0011] Optionally, the nozzle includes:

[0012] a nozzle body connected to the grid plate;

[0013] A first hole and a plurality of second holes are provided in the nozzle body, one end of the first hole is connected to the plurality of second holes, and the other end of the first hole is connected to the water supply unit;

[0014] Wherein, the nozzle body, the first hole and the plurality of second holes are all located outside the membrane stack body.

[0015] Optionally, the plurality of second holes are all inclined at a first angle α toward the membrane stack body.

[0016] Optionally, the plurality of second holes are configured as two groups of hole units axially symmetrically distributed about the nozzle body, the spacing d between adjacent second holes of the hole units is equal, and the second holes on both sides of the hole units are inclined outward at a second angle β.

[0017] Optionally, the water supply unit includes two water supply modules, and the water supply module includes a first water supply pipe, which extends from the left end or the right end of the membrane stack body to the upper end and the lower end of the membrane stack body respectively, and the first water supply pipe and several nozzles are connected through a tee pipe or an elbow pipe.

[0018] Optionally, the water supply module further includes a second water supply pipe located at the left end or the right end of the membrane stack body, and one end of the second water supply pipe is connected to the first water supply pipe via a tee pipe.

[0019] Optionally, the water supply module further includes:

[0020] a first card-free quick connector, one end of which is threadedly connected to the nozzle, and the other end of which is connected to the tee;

[0021] A second card-free quick connector, one end of which is connected to the other end of the second water supply pipe.

[0022] Optionally, the water supply module further includes:

[0023] Elbow pipe 2, the first water supply pipe extends from the left end or the right end of the membrane stack body through two of the elbow pipes 2 to the upper end and the lower end of the membrane stack body respectively;

[0024] A card-free quick-reducing connector, wherein the first water supply pipe and the elbow pipe 1 are connected via the card-free quick-reducing connector.

[0025] Optionally, the membrane stack body includes a plurality of staggered ion exchange membranes and a plurality of partitions, the positive electrode water distribution plate is in contact with the outermost ion exchange membrane, the negative electrode water distribution plate is in contact with the outermost partition, and the grid plate is located between adjacent ion exchange membranes and partitions.

[0026] An electrodialysis device comprises a membrane stack with a self-cleaning device.

[0027] Beneficial effects:

[0028] (1) Since the grid plate is located inside the membrane stack body, the grid plate does not occupy additional space, ensuring that the grid plate occupies a small space and is not likely to occupy the installation and maintenance channel of the membrane stack with the self-cleaning device of this embodiment, thereby avoiding serious impact on the installation and maintenance of the membrane stack with the self-cleaning device of this embodiment;

[0029] (2) Several nozzles are used for spraying. Since several nozzles are connected to the four sides of the grid plate, it is convenient to clean the four sides of the membrane stack body, ensuring comprehensive cleaning and thus making the cleaning thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is one of the structural schematic diagrams of a membrane stack with a self-cleaning device according to Example 1 of the present utility model;

[0031] Figure 2 for Figure 1 Partial diagram of middle C;

[0032] Figure 3 This is a second structural diagram of a membrane stack with a self-cleaning device according to Example 1 of the present utility model;

[0033] Figure 4 This is the third structural diagram of a membrane stack with a self-cleaning device according to Example 1 of the present utility model;

[0034] Figure 5 for Figure 4 Cross-sectional view of middle AA;

[0035] Figure 6 for Figure 4 Cross-section of the middle BB;

[0036] In the figure: 1. Membrane stack body; 11. Ion exchange membrane; 12. Partition; 21. Positive electrode water distribution plate; 22. Negative electrode water distribution plate; 3. Spray assembly; 31. Grille plate; 311. Grille hole; 32. Water supply unit; 321. Water supply module; 3210. Third water supply pipe; 3211. First water supply pipe; 3212. Tee pipe 1; 3213. Elbow pipe 1; 3214. Second water supply pipe; 3215. Tee pipe 2; 3216. First card-free quick connector; 3217. Second card-free quick connector; 3218. Elbow pipe 2; 3219. Card-free quick reducer; 33. Nozzle; 331. First hole; 332. Second hole; 333. Nozzle body. DETAILED DESCRIPTION

[0037] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] like Figure 1 - Figure 4 This embodiment provides a membrane stack with a self-cleaning device, including: a membrane stack body 1; a positive electrode water distribution plate 21 and a negative electrode water distribution plate 22 respectively abutting against the two sides of the membrane stack body 1; a spray assembly 3, the spray assembly 3 includes a grille plate 31, a water supply unit 32 and a plurality of nozzles 33, the plurality of nozzles 33 are connected around the grille plate 31, and the plurality of nozzles 33 are all connected to the water supply unit 32, the grille plate 31 is located inside the membrane stack body 1, and the water supply unit 32 and the plurality of nozzles 33 are all located outside the membrane stack body 1.

[0040] Specifically, the membrane stack body 1 is used to separate charged substances from the solution under the action of a DC electric field. The membrane stack body 1 may specifically include an ion exchange membrane 11, a partition 12, etc.; the positive water distribution plate 21 and the negative water distribution plate 22 are jointly used to supply DC power, and at the same time import and discharge raw water, fresh water and concentrated water. During installation, the piped surface of the positive water distribution plate 21 and the piped surface of the negative water distribution plate 22 are both facing the membrane stack body 1, wherein the positive water distribution plate 21 and the negative water distribution plate 22 are preferably made of polyvinyl chloride plate (i.e., PVC plate) with a thickness range of 30-40 mm; the grid plate 31 serves as a nozzle support component for supporting a number of nozzles 33. Since the grid plate 31 is located in the membrane stack body 1, the grid plate 31 does not occupy additional space, ensuring that the grid plate 31 occupies a small space and is not easy to occupy the installation and maintenance channel of the membrane stack with a self-cleaning device of this embodiment. , to avoid seriously affecting the installation and maintenance of the membrane stack with self-cleaning device of this embodiment, wherein the grille plate 31 can specifically adopt a polyvinyl chloride plate (i.e., PVC plate) with a thickness of about 20 mm, and a hollow grille hole 311 is carved in the central power-on area to ensure that the solution passes through; a number of nozzles 33 are used for spraying. Since the number of nozzles 33 are connected to the four sides of the grille plate 31, it is convenient to clean the four sides of the membrane stack body 1, ensuring comprehensive cleaning, thereby making the cleaning thorough. wherein, the number of the number of nozzles 33 is not limited, and eighteen are preferably set, and five are preferably set at the left and right ends of the membrane stack body 1, and four are preferably set at the upper and lower ends of the membrane stack body 1, and the number of nozzles 33 is preferably about 5 mm higher than the side of the membrane stack body 1; the water supply unit 32 is used to supply water to the number of nozzles 33, and the water supply unit 32 can specifically include a water supply pipe, a tee pipe, etc.

[0041] Further, such as Figure 2 and Figure 5 - Figure 6The nozzle 33 includes: a nozzle body 333 connected to the grid plate 31; a first hole 331 and a plurality of second holes 332, all of which are arranged in the nozzle body 333, one end of the first hole 331 and the plurality of second holes 332 are connected, and the other end of the first hole 331 is connected to the water supply unit 32; wherein the nozzle body 333, the first hole 331 and the plurality of second holes 332 are all located outside the membrane stack body 1.

[0042] Specifically, during cleaning, the water of the water supply unit 32 flows through the first hole 331 and several second holes 332 in sequence, and finally sprays to the four sides of the membrane stack body 1, wherein the shape of the nozzle body 333 can be rectangular, cylindrical, etc., preferably rectangular, the shape of the first hole 331 is preferably circular, and several second holes 332 can be interconnected to form a slit with a width of 0.5-2mm. Several second holes 332 can also be spaced apart to form a circular hole lattice with a diameter of 1-2mm, preferably a circular hole lattice, so as to further ensure the comprehensiveness of cleaning, thereby making the cleaning thorough.

[0043] Further, such as Figure 6 The plurality of second holes 332 are all inclined at a first angle α toward the membrane stack body 1. Specifically, the first angle α facilitates spraying water from the plurality of second holes 332 toward the membrane stack body 1, thereby ensuring targeted cleaning. The first angle α can be 15°, 20°, etc., and is preferably 15°.

[0044] Further, such as Figure 5 The plurality of second holes 332 are configured as two groups of hole units axially symmetrically distributed about the nozzle body 333, the spacing d between adjacent second holes 332 of the hole unit is equal, and the second holes 332 on both sides of the hole unit are inclined outward at a second angle β.

[0045] Specifically, the two groups of hole units facilitate spraying to both sides of a single nozzle body 333, thereby ensuring comprehensive cleaning. Each hole unit preferably includes 3-5 second holes 332. Since the spacing d between adjacent second holes 332 of the hole unit is equal, the spraying uniformity is good. The specific value of the spacing d is preferably about 2 mm. Since the second holes 332 on both sides of the hole unit are tilted outward at a second angle β, the spraying range is increased, thereby ensuring comprehensive cleaning. When each hole unit includes 3 second holes 332, the second angle β is preferably 30°.

[0046] Further, such as Figure 4 The water supply unit 32 includes two water supply modules 321, and the water supply module 321 includes a first water supply pipe 3211. The first water supply pipe 3211 extends from the left end or the right end of the membrane stack body 1 to the upper end and the lower end of the membrane stack body 1 respectively. The first water supply pipe 3211 and the plurality of nozzles 33 are connected through a tee pipe 3212 or an elbow pipe 3213.

[0047] Specifically, one of the water supply modules 321 supplies water to the nozzles 33 at the left end, part of the upper end, and part of the lower end, and the other water supply module 321 supplies water to the nozzles 33 at the right end, another part of the upper end, and another part of the lower end; the first water supply pipe 3211 is used to communicate with the relevant water storage device, so as to facilitate water supply to the nozzles 33. The material of the first water supply pipe 3211 is preferably polyethylene, the diameter of the first water supply pipe 3211 is preferably 9.5 mm, and the water pressure of the relevant water storage device is preferably 1-2 kg / cm 2 , so as to facilitate high-speed water flow to flush the wet crystals; the tee pipe 3212 and the elbow pipe 3213 are used to realize the connection between the first water supply pipe 3211 and the plurality of nozzles 33, and the plurality of nozzles 33 and the tee pipe 3212 and the elbow pipe 3213 are specifically connected through the third water supply pipe 3210. The material of the third water supply pipe 3210 is preferably polyethylene, and the diameter of the third water supply pipe 3210 is preferably 6.5 mm.

[0048] Further, such as Figure 4 The water supply module 321 also includes a second water supply pipe 3214 located at the left or right end of the membrane stack body 1. One end of the second water supply pipe 3214 is connected to the first water supply pipe 3211 via a second tee pipe 3215. Specifically, the other end of the second water supply pipe 3214 is connected to a related water storage device, thereby facilitating the sequential supply of water to the first water supply pipe 3211 and the nozzle 33. The second water supply pipe 3214 is preferably made of polyethylene and has a diameter of 9.5 mm. The second tee pipe 3215 connects one end of the second water supply pipe 3214 to the first water supply pipe 3211.

[0049] Further, such as Figure 4 The water supply module 321 also includes: a first card-free quick connector 3216, one end of the first card-free quick connector 3216 is threadedly connected to the nozzle 33, and the other end of the first card-free quick connector 3216 is connected to the three-way pipe 3212; a second card-free quick connector 3217, one end of the second card-free quick connector 3217 is connected to the other end of the second water supply pipe 3214.

[0050] Specifically, the first card-free quick connector 3216 facilitates the connection between the nozzle 33 and the three-way pipe 3212, and the connection speed is fast; the second card-free quick connector 3217 facilitates the connection between the other end of the second water supply pipe 3214 and the related water storage device, and the connection speed is fast.

[0051] Further, such as Figure 4The water supply module 321 also includes: an elbow pipe 2 3218, the first water supply pipe 3211 extends from the left end or the right end of the membrane stack body 1 through two elbow pipes 2 3218 to the upper end and the lower end of the membrane stack body 1 respectively; a card-free quick reducer 3219, the first water supply pipe 3211 and the elbow pipe 1 3213 are connected through the card-free quick reducer 3219.

[0052] Specifically, the elbow pipe 2 3218 facilitates the bending of the first water supply pipe 3211 ; the card-free quick reducer 3219 facilitates the rapid connection of two water supply pipes of different sizes, that is, indirectly realizes the connection between the first water supply pipe 3211 and the elbow pipe 1 3213 .

[0053] Further, such as Figure 1 - Figure 3 The membrane stack body 1 includes several ion exchange membranes 11 and several partitions 12 arranged in an alternating manner. The positive electrode water distribution plate 21 is in contact with the outermost ion exchange membrane 11, and the negative electrode water distribution plate 22 is in contact with the outermost partition 12. The grid plate 31 is located between adjacent ion exchange membranes 11 and partitions 12.

[0054] Specifically, the ion exchange membrane 11 is used to separate charged substances from the solution under the action of a DC electric field, and specifically includes an anion membrane and a cationic membrane; the partition 12 is used to separate the anion membrane and the cationic membrane to facilitate the formation of a water flow channel and play the role of water distribution and water collection.

[0055] During operation, lithium chloride or lithium sulfate from salt lakes, after pretreatment and purification, enters the lithium hydroxide preparation bipolar membrane stack to produce lithium hydroxide and hydrochloric acid or sulfuric acid. During operation, a small amount of solution will diffuse from the membrane to the surface of the membrane stack body 1 or when the edge seal is not tight and a serious leakage occurs, salt solution will appear on the surface of the membrane stack body 1. After evaporation, salt scale will form on the surface of the membrane stack body 1. Depending on the situation, the machine can be shut down for 7-30 days, and then the spray component 3 will be turned on to spray pure water at a rate of 1-2 kg / cm 2 The water is then pumped under pressure to first water supply pipe 3211, distributed to third water supply pipe 3210, and finally enters nozzle 33 and sprayed at high speed onto the surface of membrane stack 1, flushing away salt scale. After a year of operation, the surface of membrane stack 1 is clean and scale-free, demonstrating the effectiveness of the self-cleaning device.

[0056] This embodiment also provides an electrodialysis device, including a membrane stack with a self-cleaning device according to this embodiment.

[0057] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A membrane stack with a self-cleaning device, characterized in that: include: Membrane stack body (1); A positive electrode water distribution plate (21) and a negative electrode water distribution plate (22) respectively abutting against two sides of the membrane stack body (1); A spray assembly (3), the spray assembly (3) comprising a grille plate (31), a water supply unit (32) and a plurality of nozzles (33), the plurality of nozzles (33) being connected to the four sides of the grille plate (31), the plurality of nozzles (33) being communicated with the water supply unit (32), the grille plate (31) being located inside the membrane stack body (1), and the water supply unit (32) and the plurality of nozzles (33) being located outside the membrane stack body (1).

2. A membrane stack with a self-cleaning device according to claim 1, characterized in that: The nozzle (33) comprises: a nozzle body (333) connected to the grid plate (31); A first hole (331) and a plurality of second holes (332) are provided in the nozzle body (333), one end of the first hole (331) is communicated with the plurality of second holes (332), and the other end of the first hole (331) is communicated with the water supply unit (32); Wherein, the nozzle body (333), the first hole (331) and the plurality of second holes (332) are all located outside the membrane stack body (1).

3. A membrane stack with a self-cleaning device according to claim 2, characterized in that: The plurality of second holes (332) are all inclined at a first angle α toward the membrane stack body (1).

4. A membrane stack with a self-cleaning device according to claim 2, characterized in that: The plurality of second holes (332) are configured as two groups of hole units axially symmetrically distributed about the nozzle body (333), the spacing d between adjacent second holes (332) of the hole units is equal, and the second holes (332) on both sides of the hole unit are inclined outward at a second angle β.

5. A membrane stack with a self-cleaning device according to any one of claims 1 to 4, characterized in that: The water supply unit (32) includes two water supply modules (321), and the water supply module (321) includes a first water supply pipe (3211). The first water supply pipe (3211) extends from the left end or the right end of the membrane stack body (1) to the upper end and the lower end of the membrane stack body (1) respectively. The first water supply pipe (3211) and the plurality of nozzles (33) are connected through a three-way pipe (3212) or an elbow pipe (3213).

6. The membrane stack with a self-cleaning device according to claim 5, characterized in that: The water supply module (321) further comprises a second water supply pipe (3214) located at the left end or the right end of the membrane stack body (1); one end of the second water supply pipe (3214) is connected to the first water supply pipe (3211) via a second tee pipe (3215).

7. The membrane stack with a self-cleaning device according to claim 6, characterized in that: The water supply module (321) further comprises: a first card-free quick connector (3216), one end of which is threadedly connected to the nozzle (33), and the other end of which is connected to the three-way pipe (3212); A second card-free quick connector (3217), one end of the second card-free quick connector (3217) is connected to the other end of the second water supply pipe (3214).

8. The membrane stack with a self-cleaning device according to claim 5, characterized in that: The water supply module (321) further comprises: Elbow pipe 2 (3218), the first water supply pipe (3211) extends from the left end or the right end of the membrane stack body (1) through the two elbow pipes 2 (3218) to the upper end and the lower end of the membrane stack body (1); A card-free quick-reducing connector (3219), wherein the first water supply pipe (3211) and the elbow pipe 1 (3213) are connected via the card-free quick-reducing connector (3219).

9. A membrane stack with a self-cleaning device according to any one of claims 1 to 4, characterized in that: The membrane stack body (1) comprises a plurality of ion exchange membranes (11) and a plurality of partitions (12) arranged in a staggered manner, the positive electrode water distribution plate (21) abuts against the outermost ion exchange membrane (11), the negative electrode water distribution plate (22) abuts against the outermost partition (12), and the grid plate (31) is located between adjacent ion exchange membranes (11) and the partitions (12).

10. An electrodialysis device, characterized in that: It comprises a membrane stack with a self-cleaning device as described in any one of claims 1 to 9.

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