Diaphragmless electrolytic cell

Abstract

The application discloses a diaphragm-free electrolytic cell, which comprises a cell body (1) with an electrode chamber (110), a pair of electrode sheets (3) arranged at intervals in the electrode chamber (110), and a cathode sheet (3a) and an anode sheet (3b). The electrode chamber (110) is provided with an insulating screen (4) for separating the cathode sheet (3a) and the anode sheet (3b). The insulating screen (4) is provided with a plurality of screen holes (411) for fluid. Compared with the prior art, the diaphragm-free electrolytic cell can avoid short circuit caused by the contact between the cathode sheet and the anode sheet, accelerate exhaust, inhibit scale deposition, and accelerate ion transfer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrolytic equipment, in particular to a diaphragmless electrolytic cell. BACKGROUND

[0002] The electrolytic cell is composed of a cell body, an anode and a cathode, and is divided into two types of water diaphragmless electrolytic cell and diaphragm electrolytic cell according to whether an ion exchange membrane (also known as a diaphragm) is used. When direct current passes through the electrolytic cell, an oxidation reaction occurs at the interface between the anode and the solution, and a reduction reaction occurs at the interface between the cathode and the solution to produce electrolytic water.

[0003] A diaphragmless electrolytic cell for generating hypochlorous acid by supplying dilute water to cause a hydrochloric acid electrolysis reaction is disclosed in Chinese patent application No. CN201380006473.6 (publication No. CN104080954A).

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

[0005] First, the cathode and anode plates are prone to contact and cause short circuit in a narrow space, which affects the normal operation of the electrolytic cell, especially in a small electrolytic cell.

[0006] Second, a large number of gas bubbles are generated on the cathode and anode plates during the electrolysis process, which accumulate on the electrode plates and in the water path of the electrolytic cell, resulting in high voltage required by the electrolytic system, high energy consumption, reduced effective electrolysis area, and reduced electrolysis reaction efficiency, which leads to low water pH and hinders the smoothness of the water path, making the pH value and voltage extremely unstable, especially in a small electrolytic cell.

[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 is deposited on the cathode, affecting the electrolysis effect and the service life of the electrolytic cell.

[0008] Fourth, during the electrolysis process, ions and products in the electrolysis reaction process tend to accumulate around the electrode plates, which is not conducive to the diffusion and transmission of ions and the uniformity of products, thereby affecting the electrolysis efficiency and the stability of pH. SUMMARY

[0009] The first technical problem to be solved by the present application is to provide a diaphragmless electrolytic cell that can avoid contact between the cathode plate and the anode plate to cause short circuit.

[0010] The second technical problem to be solved by the present application is to provide a diaphragmless electrolytic cell that can accelerate exhaust.

[0011] The third technical problem to be solved by the present application is to provide a diaphragmless electrolytic cell capable of inhibiting scale deposition.

[0012] The fourth technical problem to be solved by the present application is to provide a diaphragmless electrolytic cell capable of accelerating ion transfer.

[0013] The technical scheme adopted by the present application to solve the above-mentioned first, second, third and fourth technical problems is as follows: a diaphragmless electrolytic cell comprises a cell body having an electrode chamber, a pair of electrode sheets arranged at intervals in the electrode chamber, and an insulating screen for separating the cathode sheet and the anode sheet, wherein the insulating screen has a plurality of screen holes for fluid to pass through.

[0014] In order to enhance the turbulence effect, at least one surface of the insulating screen has a wavy structure along the length direction. In this way, the directions of the screen holes are different, so that water flow, ions, bubbles and the like can pass through the screen holes from all directions, which can accelerate ion transfer and increase the turbulence effect.

[0015] Preferably, the wavy structure is a triangular wave or a sine wave.

[0016] In order to realize the scale scraping function, the insulating screen can move or deform relative to the cell body, and a scraping part capable of rubbing against the adjacent electrode sheet is formed at the wave crest or wave trough of the insulating screen.

[0017] In order to realize dynamic turbulence, the insulating screen can move or deform relative to the cell body. In order to form dynamic turbulence, the insulating screen is an elastic member capable of stretching and contracting along the length direction. Since the insulating screen has the free movement characteristics similar to a spring, it can stretch and contract and move freely under the action of water flow, which can accelerate the rupture and discharge of bubbles, promote turbulence, improve electrolysis efficiency and stability, and inhibit scale deposition to a certain extent.

[0018] In order to realize the stretching and contraction of the insulating screen along the length direction, the insulating screen has a foldable wavy structure.

[0019] In order to facilitate the processing of the insulating screen, the insulating screen comprises at least two unit strips arranged in sequence along the length direction, the unit strips are provided with the screen holes, the odd-numbered unit strips in the arrangement direction are referred to as first unit strips, and the even-numbered unit strips in the arrangement direction are referred to as second unit strips, the first side edge of the previous first unit strip is connected to the first side edge of the subsequent second unit strip, the second side edge of the previous second unit strip is connected to the second side edge of the subsequent first unit strip, and the adjacent two unit strips have an included angle and can be opened and closed relative to each other.

[0020] In order to realize the scale scraping function, the folding edge between the adjacent two unit strips is formed with a scraping part capable of rubbing against the adjacent electrode sheet.

[0021] In order to facilitate the free movement of the insulating screen, both ends of the insulating screen along the length direction are freely suspended.

[0022] Of course, both ends of the insulating screen along the length direction can be fixed relative to the tank, or the first end of the insulating screen along the length direction is fixed relative to the tank, and the second end is freely suspended.

[0023] In order to maximize the use of water flow to provide the insulating screen with the force of its expansion and contraction, the expansion and contraction direction of the insulating screen is basically consistent with the flow direction of the water flow in the electrode chamber.

[0024] In order to avoid the insulating screen hindering the waterway, the porosity of the insulating screen is >1%. Preferably, the porosity of the insulating screen is 40-60%. Further, the porosity of the insulating screen is 50%.

[0025] In order to facilitate the mold opening and processing of the tank, the tank is assembled by two covers, and the electrode chamber is surrounded between the two covers.

[0026] In order to facilitate the supply of raw materials and the discharge of electrolytic water, the tank is provided with a liquid inlet and a liquid outlet which are in communication with the electrode chamber.

[0027] Compared with the prior art, the advantages of the present application are:

[0028] (1) By separating the cathode sheet and the anode sheet with the insulating screen having mesh holes, on the one hand, the insulating screen separates between the cathode sheet and the anode sheet, which can effectively avoid the short circuit caused by the contact of the cathode sheet and the anode sheet; on the other hand, the water flow can form a local perturbation flow during passing through the mesh holes, which can accelerate the exhaust, inhibit the scale deposition, and accelerate the ion transfer;

[0029] (2) The insulating screen is designed as a wave-shaped structure, and the directions of the mesh holes are different, so that the water flow, ions, bubbles, etc. can pass through the mesh holes from all directions, which can accelerate the ion transfer and increase the perturbation effect;

[0030] (3) Since the insulating screen has the free movement characteristics similar to springs, it can move freely under the action of the water flow, which can accelerate the bubble rupture and discharge, promote the perturbation flow, improve the electrolysis efficiency and stability, and inhibit the scale deposition to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the three-dimensional structure of the embodiment of the membraneless electrolytic tank of the present application;

[0032] Figure 2 is Figure 1 is a schematic diagram of the three-dimensional exploded view of the membraneless electrolytic tank.

[0033] Figure 3 For Figure 2 partial enlarged view of the insulating spacer net;

[0034] Figure 4 For Figure 1 longitudinal sectional view of the diaphragmless electrolytic cell. DETAILED DESCRIPTION

[0035] The application will be further described in detail below with reference to the accompanying drawings.

[0036] As Figures 1 to 4 shown, it is a preferred embodiment of the diaphragmless electrolytic cell of the present application. The diaphragmless electrolytic cell comprises a cell body 1, electrode sheets 3 and an insulating spacer net 4.

[0037] The cell body 1 is assembled by two cover bodies 11, and a closed electrode chamber 110 is formed between the two cover bodies 11. The lower part of the front cover body 11 is provided with a liquid inlet 111 which is in communication with the electrode chamber 110, and the upper part of the rear cover body 11 is provided with a liquid outlet 112 which is in communication with the electrode chamber 110. Therefore, the water flow in the electrode chamber 110 flows from bottom to top. The two end faces of the two cover bodies 11 are clamped with a ring-shaped sealing gasket 12.

[0038] The electrode sheets 3 are arranged in pairs and spaced apart in the electrode chamber 110, and are respectively denoted as cathode sheets 3a and anode sheets 3b. The cathode sheets 3a are arranged substantially vertically at the front part of the electrode chamber 110, and the anode sheets 3b are arranged substantially vertically at the rear part of the electrode chamber 110. The top part of each electrode sheet 3 is provided with a conductive column 31 which penetrates through the corresponding cover body 11 and is exposed to the top wall of the cover body 11. The conductive columns 31 on the cathode sheets 3a and the anode sheets 3b are respectively used for electrically connecting with the negative pole and the positive pole of an external power source.

[0039] The insulating spacer net 4 is arranged in the electrode chamber 110 and is used for separating the cathode sheets 3a and the anode sheets 3b.

[0040] In the embodiment, the insulating spacer net 4 has a foldable triangular wave structure along the length direction, and both ends are freely suspended. Specifically, the insulating spacer net 4 is composed of at least two unit strips 41 which are arranged in sequence along the length direction. A plurality of net holes 411 for fluid passing are arranged in a matrix on each unit strip 41, and the porosity of the insulating spacer net 4 is 50%. The odd-numbered unit strips 41 in the arrangement direction are denoted as first unit strips 41a, and the even-numbered unit strips 41 in the arrangement direction are denoted as second unit strips 41b. The first side edge of the previous first unit strip 41a is connected with the first side edge of the subsequent second unit strip 41b, and the second side edge of the previous second unit strip 41b is connected with the second side edge of the subsequent first unit strip 41a.

[0041] The insulation spacer net 4 has the following effects: first, the insulation spacer net 4 is arranged between the cathode sheet 3a and the anode sheet 3b, which can effectively avoid short circuit caused by contact between the cathode sheet 3a and the anode sheet 3b; second, the water flow can form local micro-turbulence during passing through the mesh hole 411, which can accelerate exhaust, inhibit scale deposition, and accelerate ion transfer; third, for the insulation spacer net 4 with a triangular wave structure, the directions of the mesh holes 411 are different, so that the water flow, ions, bubbles and the like pass through the mesh holes 411 from all directions, which can accelerate ion transfer and increase turbulence effect; fourth, the folding edge between the two adjacent unit strips 41 forms a scraping part 410 capable of rubbing contact with the adjacent electrode sheet 3, thereby realizing scale scraping.

[0042] In the embodiment, the insulation spacer net 4 is made of a material (food grade) with good insulation performance, high and low temperature resistance, and strong acid and alkali resistance, and is preferably food grade Teflon. The two adjacent unit strips 41 have an included angle and can be relatively opened and closed, so that the insulation spacer net 4 as a whole presents an elastic member capable of stretching in the length direction. The thickness of the insulation spacer net 4 is denoted as H, which changes during the stretching of the insulation spacer net 4. Due to the free movement characteristics of the insulation spacer net 4 similar to a spring, the insulation spacer net 4 can stretch and freely move under the action of the water flow, which can accelerate bubble rupture and discharge, promote turbulence, improve electrolysis efficiency and stability, and inhibit scale deposition to some extent.

[0043] In the embodiment, the length direction of the insulation spacer net 4 is the vertical direction, which is basically consistent with the flow direction of the water flow in the electrode chamber 110. The water flow flowing from bottom to top can conveniently provide the action force for the stretching movement of the insulation spacer net 4 with a triangular wave structure in the vertical direction.

[0044] The working principle of the embodiment is as follows: during work, 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, an oxidation reaction occurs at the interface between the anode sheet 3b and the solution, and electrolytic water is prepared. During the electrolysis process, the insulation spacer net 4 can stretch and freely move under the action of the water flow. First, the insulation spacer net 4 is arranged between the cathode sheet 3a and the anode sheet 3b, which can effectively avoid short circuit caused by contact between the cathode sheet 3a and the anode sheet 3b; second, the mesh hole 411 of the insulation spacer net 4 forms local micro-turbulence, and the movement of the insulation spacer net 4 forms dynamic turbulence, which can accelerate exhaust, inhibit scale deposition, and accelerate ion transfer; third, the thickness of the insulation spacer net 4 increases in the compressed state, so that the scraping part 410 of the insulation spacer net 4 rubs the adjacent electrode sheet 3 or diaphragm 2, thereby realizing the scraping and scale removal function on the surface of the electrode sheet 3 and the diaphragm 2.

[0045] The advantages of the present application are as follows:

[0046] (1) By adding an insulating screen 4 between the cathode sheet 3a and the anode sheet 3b, a protective effect is achieved, and the insulating screen 4 is designed as a dynamic insulating screen with a triangular wave structure. The dynamic disturbance formed by the movement of the insulating screen 4, the local disturbance formed by the mesh of the insulating screen 4, and the scraping effect formed by the contact with the wall surface greatly accelerate the bubble discharge in the electrode sheet 3 and the waterway of the membraneless electrolytic cell. Compared with the commonly used method of designing a gas discharge port on the membraneless electrolytic cell, which requires 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 membraneless electrolytic cells.

[0047] (2) The dynamic disturbance formed by the movement of the insulating screen 4 and the local disturbance formed by the mesh of the insulating screen 4 prevent scale deposition, and the scraping effect formed by the contact with the wall surface further plays a role in scale removal. 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 frequent positive and negative electrode switching is not required. The cost is lower, the structure is simple, the requirement for electric control is low, and the electrode life is guaranteed.

[0048] (3) The dynamic disturbance formed by the movement of the insulating screen 4 and the local disturbance formed by the mesh of the insulating screen 4 accelerate ion diffusion and transfer, and improve the pH value and stability of the outlet water.

Claims

1. A diaphragm-free electrolytic cell, comprising a cell body (1) having an electrode chamber (110), wherein a pair of spaced-apart electrode plates (3), denoted as a cathode plate (3a) and an anode plate (3b), are disposed within the electrode chamber (110), characterized in that: The electrode chamber (110) is provided with an insulating mesh (4) for separating the cathode plate (3a) and the anode plate (3b), and the insulating mesh (4) has a plurality of mesh holes (411) for fluid to pass through; The insulating mesh (4) has at least one surface with an undulating waveform structure along its length; The insulating mesh (4) can move or deform relative to the trough (1).

2. The diaphragmless electrolytic cell according to claim 1, characterized in that: The waveform structure described is a triangular wave or a sine wave.

3. The diaphragmless electrolytic cell according to claim 2, characterized in that: The insulating mesh (4) has a scraping part (410) formed at the crest or trough that can rub against the adjacent electrode sheet (3).

4. The diaphragmless electrolytic cell according to claim 1, characterized in that: The insulating mesh (4) is an elastic element that can stretch and contract along its length.

5. The diaphragmless electrolytic cell according to claim 4, characterized in that: The insulating mesh (4) has a foldable waveform structure.

6. The diaphragmless electrolytic cell according to claim 5, characterized in that: The insulating mesh (4) includes at least two unit strips (41) arranged sequentially along its length. The unit strip (41) has the mesh (411) formed thereon. The odd-numbered unit strip (41) in the arrangement direction is called the first unit strip (41a), and the even-numbered unit strip (41) in the arrangement direction is called the second unit strip (41b). The first side of the first unit strip (41a) is connected to the first side of the second unit strip (41b), and the second side of the second unit strip (41b) is connected to the second side of the first unit strip (41a). The two adjacent unit strips (41) have an included angle and can be opened and closed relative to each other.

7. The diaphragmless electrolytic cell according to claim 6, characterized in that: The folded edge between two adjacent unit strips (41) forms a scraping part (410) that can rub against the adjacent electrode sheet (3).

8. The diaphragmless electrolytic cell according to claim 4, characterized in that: The insulating mesh (4) is suspended freely at both ends along its length; or The insulating mesh (4) is fixed at both ends relative to the groove (1) along its length; or The first end of the insulating mesh (4) along its length is fixed relative to the groove (1), and the second end is suspended freely.

9. The diaphragmless electrolytic cell according to claim 8, characterized in that: The extension and retraction direction of the insulating mesh (4) is basically consistent with the flow direction of the water in the electrode chamber (110).

10. The diaphragmless electrolyzer according to any one of claims 1 to 9, characterized in that: The porosity of the insulating mesh (4) is >1%.

11. The diaphragmless electrolytic cell according to claim 10, characterized in that: The porosity of the insulating mesh (4) is 40-60%.

12. The diaphragmless electrolyzer according to any one of claims 1 to 9, characterized in that: The tank (1) is formed by assembling two covers (11), and the electrode chamber (110) is formed between the two covers (11).

13. The diaphragmless electrolyzer according to any one of claims 1 to 9, characterized in that: The tank (1) is provided with an inlet (111) and an outlet (112) that communicate with the electrode chamber (110).

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