An insulating grid for an electrolytic cell and an electrolytic cell

Abstract

The application discloses an insulating spacer net for an electrolytic cell, characterized in that the insulating spacer net (4) is used for separating two electrode sheets (3), and the peripheral part of the insulating spacer net (4) is provided with a plurality of circumferentially spaced turbulence vanes. The application further discloses an electrolytic cell provided with the insulating spacer net. Compared with the prior art, the insulating spacer net can improve the turbulence effect, thereby accelerating exhaust, inhibiting scale deposition and accelerating ion transfer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrolytic equipment, in particular to an insulating separation net for an electrolytic cell and the electrolytic cell. BACKGROUND

[0002] An electrolytic cell is composed of a cell body, an anode and a cathode, and an ion exchange membrane (also known as a separation membrane) is used to separate the anode chamber and the cathode chamber. According to the different electrolytes, there are three types of electrolytic cells: aqueous solution electrolytic cell, molten salt electrolytic cell and non-aqueous solution electrolytic cell. When direct current passes through the electrolytic cell, oxidation reaction occurs at the interface between the anode and the solution, and reduction reaction occurs at the interface between the cathode and the solution, so as to produce electrolytic water.

[0003] For example, the Chinese invention patent with patent application number CN201810264395.4 (publication number CN108609693A) "Preparation method of acidic water and alkaline water" forms cations and anions by electrolyzing salt water, and the cations and anions move to the two poles of the electrolytic electrode respectively. Hydrogen ions and active chlorine gas are generated from the anode, the chlorine gas dissolves in water to form hypochlorous acid and hydrochloric acid solution as acidic water. Hydroxyl ions and hydrogen gas are generated from the cathode to form sodium hydroxide solution as alkaline water.

[0004] The existing electrolytic water preparation process has the following problems:

[0005] First, the ion exchange membrane is a unique high molecular film containing ion groups and having selective permeability to cations or anions in the solution. It has a certain flexibility. Over time, it will be deformed under the influence of air pressure and water pressure, and even contact the electrode sheet to cause dry burning, affecting the water output effect and the service life of the electrolytic cell, especially in small electrolytic cells.

[0006] Second, during the electrolysis process, a large amount of gas bubbles will be generated on the anode and cathode sheets. The gas bubbles accumulate on the electrode sheets, ion exchange membranes and water channels in the electrolytic cell, resulting in high voltage required by the electrolytic system, high energy consumption, reduced effective electrolysis area, reduced electrolysis reaction efficiency, low water pH, and hindered water channel, making the pH value and voltage extremely unstable. Air pressure will also exacerbate the deformation of the ion exchange membrane in the middle, especially in small electrolytic cells.

[0007] Third, during the electrolysis process, OH - generated by the cathode (negative electrode) reacts with Ca 2+ , Mg 2+ , etc. in water to form scale, which deposits on the cathode and ion exchange membrane, affecting the electrolysis effect and the service life of the electrolytic cell.

[0008] Fourthly, in the electrolysis process, ions need to pass through the ion exchange membrane from the anode chamber to the cathode chamber to promote the entire electrolysis reaction, but ions and products are prone to gather around the electrode sheet during the electrolysis reaction, which is not conducive to the diffusion and transmission of ions and the uniformity of the products, thereby affecting the electrolysis efficiency and the stability of pH.

[0009] In addition, the Chinese invention patent with patent application number CN202080012097.1 (publication number CN113474492A) “Electrolyte manufacturing device and electrolyte manufacturing method” discloses that the diaphragm and the electrode sheet are separated by setting a screen between the diaphragm and the electrode sheet to avoid the diaphragm from contacting the electrode sheet to cause dry burning, although the water flow can form a local perturbation flow during passing through the mesh hole, but the effect of the perturbation flow is limited, which cannot well accelerate the exhaust, inhibit the scale deposition, and accelerate the ion transmission. SUMMARY

[0010] The first technical problem to be solved by the present application is to provide an insulating screen for electrolytic cell capable of improving the perturbation flow effect and accelerating the exhaust.

[0011] The second technical problem to be solved by the present application is to provide an insulating screen for electrolytic cell capable of improving the perturbation flow effect and inhibiting the scale deposition.

[0012] The third technical problem to be solved by the present application is to provide an insulating screen for electrolytic cell capable of improving the perturbation flow effect and accelerating the ion transmission.

[0013] The fourth technical problem to be solved by the present application is to provide an electrolytic cell applying the above-mentioned insulating screen.

[0014] The technical solution adopted by the present application to solve the above-mentioned first, second and third technical problems is: an insulating screen for electrolytic cell, characterized in that the insulating screen is used to separate between two electrode sheets, and the peripheral part of the insulating screen has a plurality of perturbation fins arranged in the circumferential direction.

[0015] In order to facilitate the formation of the perturbation fins, the insulating screen comprises

[0016] a central shaft;

[0017] strip-shaped blades arranged in the circumferential direction along the central shaft, the first end of each strip-shaped blade being connected with the central shaft, and the second end of each strip-shaped blade forming the perturbation fin; and

[0018] annular connecting strips arranged in the radial direction along the central shaft, each annular connecting strip being connected with all the strip-shaped blades;

[0019] The adjacent two strip-shaped blades and the adjacent two ring-shaped connecting strips form a mesh for fluid to pass through.

[0020] In order to improve the turbulence effect, the strip-shaped blade is arc-shaped.

[0021] The electrolytic cell using the insulating mesh is provided.

[0022] In order to facilitate the setting of the insulating mesh, the electrolytic cell comprises a tank body and a diaphragm arranged in the tank body, the diaphragm divides the inner cavity of the tank body into at least two electrode chambers, the electrode sheet and the insulating mesh are arranged in each electrode chamber, and the insulating mesh is arranged between the adjacent diaphragm and electrode sheet.

[0023] In order to improve the turbulence effect of the turbulence piece by means of water flow, the insulating mesh is rotatably connected to the tank body through the central shaft, so that the strip-shaped blade drives the entire insulating mesh to rotate around its own axis under the action of water flow.

[0024] In order to improve the degree of freedom of the insulating mesh, the electrode chamber is provided with a fixed rod corresponding to the insulating mesh, the central shaft is rotatably sleeved on the outer periphery of the corresponding fixed rod and can slide along the length direction of the corresponding fixed rod.

[0025] In order to maximize the use of water flow to provide the self-rotation force of the insulating mesh, the axial direction of the central shaft is substantially perpendicular to the flow direction of the water flow in the electrode chamber.

[0026] In order to make the insulating mesh cover the entire electrode chamber as much as possible, at least two insulating meshes are arranged in each electrode chamber in sequence along the long side direction of the electrode chamber.

[0027] In order to facilitate the supply of raw materials and the discharge of electrolytic water, the tank body part corresponding to each electrode chamber is provided with a liquid inlet and a liquid outlet penetrating through the electrode chamber.

[0028] In order to facilitate the water flow path between the liquid inlet and the liquid outlet to cover each insulating mesh, the liquid inlet and the liquid outlet are respectively located at both ends of the long side direction of the electrode chamber.

[0029] In order to facilitate the flowing water to exert force on the outer peripheral part of the insulating mesh, the axes of all the insulating meshes are in the same plane, and the liquid inlet and the liquid outlet are offset from the plane.

[0030] In order to improve the effect of the spoiler, the two adjacent insulating screens are called the first insulating screen and the second insulating screen, the spoiler of the first insulating screen can contact the spoiler of the second insulating screen in the rotating process, so as to drive the second insulating screen to rotate around the axis of the second insulating screen.

[0031] Compared with the prior art, the advantages of the present application are that:

[0032] (1) By arranging a plurality of spoilers arranged in the circumferential direction on the periphery of the insulating screen, the electrolytic tank can be disturbed, so as to accelerate the exhaust, inhibit the deposition of scale, and accelerate the ion transfer;

[0033] (2) By rotating the insulating screen on the tank body, the insulating screen rotates around its axis under the action of water flow, which can realize dynamic disturbance, accelerate exhaust, inhibit scale deposition, and accelerate ion transfer. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a schematic view of the three-dimensional structure of the electrolytic tank of the embodiment of the present application;

[0035] Figure 2 is Figure 1 a schematic view of the three-dimensional exploded view of the electrolytic tank;

[0036] Figure 3 is Figure 2 a schematic view of the three-dimensional structure of the insulating screen;

[0037] Figure 4 is Figure 1 a longitudinal sectional view of the electrolytic tank;

[0038] Figure 5 is Figure 4 an enlarged view of part I;

[0039] Figure 6 is Figure 1 a longitudinal sectional view of the electrolytic tank in another direction. DETAILED DESCRIPTION

[0040] The present application will be further described in detail below in conjunction with the embodiments of the drawings.

[0041] As Figures 1 to 6 shown, it is a preferred embodiment of the electrolytic tank of the present application. The electrolytic tank comprises a tank body 1, a diaphragm 2, an electrode sheet 3 and an insulating screen 4. The electrolytic tank in this embodiment is a single diaphragm electrolytic tank, of course, it can also be designed into a double diaphragm electrolytic tank or a diaphragmless electrolytic tank according to the needs.

[0042] The groove body 1 is formed by assembling two cover bodies 11 through fasteners in front and back, and a closed inner cavity is formed between the two cover bodies 11. Two annular sealing pads 12 are arranged in front and back between the opposite end faces of the two cover bodies 11. A plurality of fixed rods 13 are arranged in the inner cavity of each cover body 11 in a vertical direction, and each fixed rod 13 extends in the front and back directions.

[0043] The diaphragm 2 is a cation exchange membrane and is arranged vertically in the inner cavity of the groove body 1. The periphery of the diaphragm 2 is clamped between the two annular sealing pads 12. The number of the diaphragm 2 is one, and the inner cavity of the groove body 1 is divided into two electrode chambers 110. The electrode chamber 110 between the front cover body 11 and the diaphragm 2 is referred to as a cathode chamber 110a, and the electrode chamber 110 between the rear cover body 11 and the diaphragm 2 is referred to as an anode chamber 110b. The lower right side and the upper left side of the front cover body 11 are respectively provided with a liquid inlet 111 and a liquid outlet 112 which communicate with the cathode chamber 110a. The lower left side and the upper right side of the rear cover body 11 are respectively provided with a liquid inlet 111 and a liquid outlet 112 which communicate with the anode chamber 110b. Therefore, the water flow in each electrode chamber 110 flows obliquely from bottom to top.

[0044] The number of the electrode sheets 3 is one pair, which are referred to as a cathode sheet 3a and an anode sheet 3b. The cathode sheet 3a is arranged vertically in the front of the cathode chamber 110a, and the anode sheet 3b is arranged vertically in the rear of the anode chamber 110b. Each electrode sheet 3 has a clearance hole for the fixed rod 13 to pass through. The top of each electrode sheet 3 has a conductive column 31 which passes through the corresponding cover body 11 upward and is exposed to the top wall of the cover body 11. The conductive columns 31 on the cathode sheet 3a and the anode sheet 3b are respectively used for electrical connection with the negative electrode and the positive electrode of an external power supply.

[0045] The number of the insulating separation nets 4 is two groups, which correspond to the two electrode chambers 110. The two groups of insulating separation nets 4 are respectively located in the corresponding electrode chambers 110 and are used for separating adjacent diaphragms 2 and electrode sheets 3. Each group of insulating separation nets 4 includes a plurality of insulating separation nets 4 arranged in sequence along the long side direction of the electrode chamber 110. The insulating separation nets 4 correspond one-to-one to the fixed rods 13.

[0046] In the embodiment, each insulating screen 4 comprises a central shaft 40, strip-shaped blades 41 and annular connecting pieces 42. Specifically, the central shaft 40 is rotatably sleeved on the outer periphery of the corresponding fixed rod 13 and can slide along the length direction of the corresponding fixed rod 13; the strip-shaped blades 41 are a plurality of strip-shaped blades arranged at intervals in the circumferential direction of the central shaft 40, each strip-shaped blade 41 is arc-shaped, the first end of each strip-shaped blade 41 is connected with the central shaft 40, and the second end of each strip-shaped blade 41 is formed with a spoiler; the annular connecting pieces 42 are a plurality of annular connecting pieces arranged at intervals in the radial direction of the central shaft 40, each annular connecting piece 42 is connected with all the strip-shaped blades 41; and the screen hole 411 for fluid passing through is formed between any two adjacent strip-shaped blades 41 and any two adjacent annular connecting pieces 42.

[0047] The insulating screen 4 has the following effects: first, the insulating screen 4 is arranged between the diaphragm 2 and the electrode sheet 3, which can effectively avoid the diaphragm 2 from contacting the electrode sheet 3 to cause dry burning; second, the water flow can form a local micro-turbulence during passing through the screen hole 411, which can accelerate exhaust, inhibit scale deposition and accelerate ion transfer; third, the strip-shaped blades 41 can drive the entire insulating screen 4 to rotate around the axis thereof under the action of the water flow, so as to realize dynamic turbulence; and fourth, the side edge of the strip-shaped blade 41 is formed with a scraping part 410 which can be in frictional contact with the adjacent diaphragm 2 or electrode sheet 3, so as to realize scale scraping.

[0048] In the embodiment, the insulating screen 4 is made of a material (food grade) which has good insulation performance, high and low temperature resistance, strong acid and alkali resistance, and is preferably food grade Teflon.

[0049] In the embodiment, the central shaft 40 is substantially perpendicular to the diaphragm 2 and the electrode sheet 3, so that when the insulating screen 4 is close to the diaphragm 2 or the electrode sheet 3, each scraping part 410 on the same side can be in contact with the diaphragm 2 or the electrode sheet 3; in addition, the axial direction of the central shaft 40 is the front-rear direction, which is substantially perpendicular to the flow direction of the water flow in the electrode chamber 110, and since the liquid inlet 111 and the liquid outlet 112 are respectively located at the two ends of the long side direction of the electrode chamber 110, the water flow path flowing from bottom to top covers each insulating screen 4, which can conveniently provide each insulating screen 4 with the force for rotating around the fixed rod 13; in addition, the axes of all the insulating screens 4 are in the same vertical plane, and the liquid inlet 111 and the liquid outlet 112 are respectively located on the two sides of the vertical plane, that is, the liquid inlet 111 and the liquid outlet 112 are both deviated from the vertical plane, so that the flowing water flow mainly applies force to the outer peripheral part of the insulating screen 4, which is more labor-saving.

[0050] In addition, the two adjacent insulating screens 4 are referred to as a first insulating screen and a second insulating screen, the spoiler of the first insulating screen can be in contact with the spoiler of the second insulating screen during rotation, so as to drive the second insulating screen to rotate around the axis thereof, thereby improving the turbulence effect.

[0051] The working principle of the embodiment is as follows: in operation, the electrolyte enters the electrode chamber 110 through the liquid inlet 111, a reduction reaction occurs at the interface between the cathode sheet 3a and the solution, and an oxidation reaction occurs at the interface between the anode sheet 3b and the solution, so as to produce electrolytic water. In the electrolysis process, the insulating screen 4 can rotate freely and slide axially under the action of water flow. First, the insulating screen 4 is separated between the diaphragm 2 and the electrode sheet 3, which can effectively prevent the diaphragm 2 from contacting the electrode sheet 3 to cause dry burning. Second, the mesh holes 411 of the insulating screen 4 form local perturbation flow, and the movement of the insulating screen 4 forms dynamic perturbation flow, which can accelerate exhaust, inhibit scale deposition, and accelerate ion transfer. Third, the insulating screen 4 can slide axially to approach the adjacent diaphragm 2 or electrode sheet 3, so that the rotating scraping part 410 is in frictional contact with the adjacent diaphragm 2 or electrode sheet 3, realizing the scraping and scale removal function on the surface of the electrode sheet 3 and the diaphragm 2.

[0052] The advantages of the present application are as follows:

[0053] (1) By adding the insulating screen 4 between the diaphragm 2 and the electrode sheet 3, the diaphragm 2 is supported and protected, and the insulating screen 4 is designed as a dynamic insulating screen in the form of a fan leaf. The dynamic perturbation flow formed by the movement of the insulating screen 4, the local perturbation flow formed by the mesh holes of the insulating screen 4, and the scraping action formed by the contact with the wall surface during movement greatly accelerate the exhaust of bubbles in the electrode sheet 3, the diaphragm 2 and the waterway of the electrolytic cell. Compared with the commonly used exhaust port design on the electrolytic cell, the exhaust method needs additional sealing design and other auxiliary exhaust design, the exhaust effect is better, the structure is simpler, the cost is controllable, and it is very suitable for small electrolytic cells.

[0054] (2) The dynamic perturbation flow formed by the movement of the insulating screen 4 and the local perturbation flow formed by the mesh holes of the insulating screen 4 prevent scale deposition, and the scraping action formed by the contact with the wall surface further plays a scale removal role. Compared with the commonly used positive and negative electrode switching scale removal method, the positive and negative electrodes do not need to have a catalytic coating that can participate in the positive electrode reaction, and the positive and negative electrodes do not need to be frequently switched. The cost is lower, the structure is simple, the requirement for electric control is low, and the electrode life is guaranteed.

[0055] (3) The dynamic perturbation flow formed by the movement of the insulating screen 4 and the local perturbation flow formed by the mesh holes of the insulating screen 4 accelerate ion diffusion and transfer, and improve the pH value and stability of the outlet water.

Claims

1. An electrolytic cell comprising two electrode sheets (3), characterised in that: The insulating screen (4) is provided with a plurality of circumferentially spaced spoilers. The insulating screen (4) comprises a central shaft (40); strip-shaped blades (41) circumferentially spaced along the central shaft (40), a first end of each strip-shaped blade (41) being connected to the central shaft (40), and a second end of each strip-shaped blade (41) forming the spoiler; and annular connecting strips (42) radially spaced along the central shaft (40), each annular connecting strip (42) being connected to all the strip-shaped blades (41); a mesh (411) for fluid passing is formed between two adjacent strip-shaped blades (41) and two adjacent annular connecting strips (42).

2. The electrolytic cell of claim 1, wherein: The strip-shaped blades (41) are arc-shaped.

3. The electrolytic cell of claim 1, wherein: The electrolytic cell comprises a cell body (1) and a diaphragm (2) arranged in the cell body (1), the diaphragm (2) divides the inner cavity of the cell body (1) into at least two electrode chambers (110), each electrode chamber (110) is provided with the electrode sheet (3) and the insulating screen (4), and the insulating screen (4) is arranged between the adjacent diaphragm (2) and electrode sheet (3).

4. The electrolytic cell of claim 3, wherein: The insulating screen (4) is rotatably connected to the cell body (1) through the central shaft (40), so that the strip-shaped blades (41) drive the entire insulating screen (4) to rotate around its own axis under the action of water flow.

5. The electrolytic cell of claim 4, wherein: The electrode chamber (110) is provided with a fixed rod (13) corresponding to the insulating screen (4), and the central shaft (40) is rotatably sleeved on the outer periphery of the corresponding fixed rod (13) and can slide along the length direction of the corresponding fixed rod (13).

6. The electrolytic cell of claim 4, wherein: The axial direction of the central shaft (40) is substantially perpendicular to the flow direction of the water flow in the electrode chamber (110).

7. The electrolytic cell of claim 4, wherein: Each electrode chamber (110) is provided with at least two insulating screens (4) arranged in sequence along the long side direction of the electrode chamber (110).

8. The electrolytic cell of claim 7, wherein: The part of the cell body (1) corresponding to each electrode chamber (110) is provided with a liquid inlet (111) and a liquid outlet (112) penetrating through the electrode chamber (110).

9. The electrolytic cell of claim 8, wherein: The liquid inlet (111) and the liquid outlet (112) are respectively located at both ends of the long side direction of the electrode chamber (110).

10. The electrolytic cell of claim 9, wherein: The axes of all the insulating screens (4) are in the same plane, and the liquid inlet (111) and the liquid outlet (112) are both deviated from the plane.

11. The electrolytic cell of claim 7, wherein: Two adjacent insulating screens (4) are denoted as a first insulating screen and a second insulating screen, and the spoiler of the first insulating screen can contact the spoiler of the second insulating screen during rotation to drive the second insulating screen to rotate around its own axis.

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