Device for improving current efficiency of ionic membrane electrolytic bath

Abstract

The invention relates to the technical field of electrolytic baths, in particular to a device for improving the current efficiency of an ionic membrane electrolytic bath, which comprises a bath body, an anode body, a cathode body and an ionic membrane body, and further comprises a first liquid supplementing port and a second liquid supplementing port which are arranged on the two sides of the bath body, and liquid supplementing cooling mechanisms are arranged inside and outside the bath body; the vertical cylinder is rotationally connected to the surface of the partition plate; in the liquid supplementing process, liquid pushes the rotating disc to rotate so as to drive the vertical cylinder and the ribs to rotate under the action of the transmission rod, the ribs capture bubbles around the anode through micropores in the surface in the rotating process and cut the bubbles through crushing teeth in the ribs, and then the situation that a large number of bubbles are gathered around the anode body is prevented; and meanwhile, through the power generated by the flowing of the supplemented liquid, the energy consumption of the device can be saved.

Description

Technical Field

[0001] This invention relates to the field of electrolytic cell technology, specifically to a device for improving the current efficiency of ion-exchange membrane electrolytic cells. Background Technology

[0002] An ion-exchange membrane electrolyzer is a device that utilizes ion-exchange membranes for electrolytic reactions. It mainly consists of an anode chamber, a cathode chamber, and an ion-exchange membrane. Its principle is that under the action of direct current, oxidation reactions occur in the anode chamber, such as the oxidation of chloride ions to chlorine gas; reduction reactions occur in the cathode chamber, such as the reduction of water to hydrogen gas and hydroxide ions. The ion-exchange membrane allows sodium ions to pass through while blocking other ions, thereby separating the products and maintaining the electrolyte concentration. This equipment is widely used in the chlor-alkali industry for the efficient production of chemical products such as chlorine, hydrogen, and sodium hydroxide.

[0003] During electrolysis in an ion-exchange membrane electrolyzer, chloride ions are oxidized to chlorine gas at the anode in a chemical reaction. However, equipment design or operational issues, such as uneven anolyte circulation or excessively wide mesh, can exacerbate bubble formation. These bubbles adhere to the anode or membrane, hindering ion migration, increasing the effective resistance of the anode, and leading to increased electrolyzer voltage and decreased current efficiency. Furthermore, the Joule heat generated by the current passing through the electrolyte during electrolysis causes uneven thermal expansion of the ion-exchange membrane, resulting in wrinkles and further increasing resistance. Summary of the Invention

[0004] The purpose of this invention is to provide a device for improving the current efficiency of an ion exchange membrane electrochemical cell, which has the function of cutting bubbles to prevent a large number of bubbles from accumulating around the anode.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a device for improving the current efficiency of an ion-exchange membrane electrochemical cell, comprising a cell body, an anode body, a cathode body, and an ion-exchange membrane body, and further comprising: The first and second liquid inlets are provided on both sides of the tank, and the tank is equipped with a liquid replenishment and cooling mechanism inside and outside the tank. A vertical cylinder is rotatably connected to the surface of the partition plate. A transmission assembly for driving the vertical cylinder to rotate is provided on one side and inside the trough. A first connecting rod is welded to the lower surface of the vertical cylinder. A rib is bolted to the other end of the first connecting rod. Several micro-holes are opened on the surface of the rib. Several crushing teeth are fixed inside the micro-holes.

[0006] Preferably, the liquid replenishment and cooling mechanism includes a vertical pipe, a first connecting pipe, and a second connecting pipe. There are two sets of vertical pipes located on both sides of the ion membrane body. One end of the first connecting pipe is connected to the housing, and the other end of the first connecting pipe is connected to one set of vertical pipes. One end of the second connecting pipe is connected to the second liquid replenishment port, and the other end of the second connecting pipe is connected to the other set of vertical pipes. Several through holes are provided on the surface of the vertical pipe.

[0007] Preferably, one set of through holes on the surface of the vertical tube faces the anode body, and the other set of through holes on the surface of the vertical tube faces the cathode body.

[0008] Preferably, the inner wall of the through hole is further provided with a flexible membrane flap.

[0009] Preferably, the transmission assembly includes a turntable, blades, and a transmission rod. The turntable is rotatably connected to the interior of the box body. The number of blades is several and fixed to the surface of the turntable. One end of the transmission rod is fixed to the rotating shaft of the turntable, and the other end of the transmission rod extends into the interior of the trough and is connected to the vertical cylinder via a bevel gear transmission. The passage between the transmission rod and the trough body is fixed to each other by a bearing.

[0010] Preferably, vertical pipes are provided on both sides of the upper part of the tank. One set of vertical pipes passes through the vertical cylinder and is fixed to its inner wall by a sealed bearing, while the other set of vertical pipes passes through the partition.

[0011] Preferably, a first air outlet and a second air outlet are respectively provided on both sides of the top of the tank, and the bottom ends of the first air outlet and the second air outlet are connected to pipes that penetrate to the bottom of the partition.

[0012] Preferably, a first liquid outlet and a second liquid outlet are respectively connected to both sides below the surface of the tank.

[0013] Preferably, an insulating seat is fixed to the lower part of the tank body, the bottom end of the anode body is fixed to the top of the insulating seat, and a second connecting rod is bolted to the lower part of the rib surface. The other end of the second connecting rod is bolted to a ring body, and the ring body is fitted onto the surface of the insulating seat and rotatably connected to it.

[0014] Preferably, the ribs are spirally designed, and the pitch of the ribs decreases from top to bottom, while the inner diameter of the micropores increases from the inside to the outside.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes the liquid to drive the turntable to rotate during the replenishment process, which in turn drives the vertical cylinder and ribs to rotate under the action of the transmission rod. During the rotation, the ribs capture air bubbles around the anode through micropores on their surface and cut the air bubbles through internal breaking teeth. This prevents a large number of air bubbles from accumulating around the anode body, which would increase the effective resistance of the anode and affect the current efficiency. At the same time, the power generated by the flow of replenishing liquid can save energy consumption of the device.

[0016] 2. In the process of replenishing the liquid, the liquid passes through the first connecting pipe, the second connecting pipe and the vertical pipe and is discharged from the through hole. It absorbs the heat of the ion membrane to cool it down and prevents the ion membrane from wrinkling due to uneven thermal expansion during operation. At the same time, the flexible membrane flap inside the through hole achieves the effect of one-way liquid passage and prevents the liquid inside the anode chamber or cathode chamber from entering the interior of the vertical pipe through the through hole. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure in this invention; Figure 2 This is a schematic cross-sectional view of the tank body in this invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 5 This is a cross-sectional view of the micropores in this invention; Figure 6 This is a cross-sectional view of the box body in this invention; Figure 7 This is a cross-sectional view of the vertical cylinder in this invention; Figure 8 This is a partial structural schematic diagram of the liquid replenishment and cooling mechanism in this invention; Figure 9 This is a schematic diagram of the other parts of the liquid replenishment and cooling mechanism in this invention; Figure 10 This is a schematic diagram of the ion exchange membrane body and the vertical tube in this invention; Figure 11 This is a cross-sectional view of the vertical pipe in this invention; Figure 12 For the present invention Figure 11 A magnified structural diagram at point C.

[0018] In the diagram: 1. Tank; 2. Anode body; 3. Cathode body; 4. Baffle; 5. First liquid inlet; 6. Second liquid inlet; 7. Box body; 8. First liquid outlet; 9. Liquid replenishment and cooling mechanism; 91. Vertical pipe; 92. First connecting pipe; 93. Second connecting pipe; 94. Through hole; 95. Flexible membrane flap; 10. Ion membrane body; 11. Transmission assembly; 111. Turntable; 112. Blade; 113. Transmission rod; 12. Vertical cylinder; 13. First connecting rod; 14. Rib; 15. Micropore; 16. Vertical pipe; 17. Insulating seat; 18. Ring body; 19. Second connecting rod; 20. Crushing tooth; 21. First air outlet; 22. Second air outlet; 23. Second liquid outlet. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-12 As shown, a device for improving the current efficiency of an ion-exchange membrane electrolytic cell includes a tank body 1, an anode body 2, a cathode body 3, and an ion-exchange membrane body 10. A first replenishment port 5 and a second replenishment port 6 are respectively provided on both sides of the tank body 1, used for replenishing the anode chamber and cathode chamber, respectively. The main purpose is to replenish the cathode chamber with electrolyte or pure water. During electrolysis, the composition and concentration of the electrolyte in the cathode chamber will change. The replenishment port can add new electrolyte to adjust the concentration and temperature of the cathode solution, maintaining the stability of the electrolysis reaction. Simultaneously, adding pure water can dilute the cathode solution, preventing excessively high cathode solution concentration from affecting the electrolysis efficiency and the performance of the ion-exchange membrane. A first outlet port 8 and a second outlet port 23 are respectively connected to the two sides below the surface of the tank body 1. A baffle 4 is bolted to the top of the tank 1 where the generated sodium hydroxide solution is discharged. A first vent 21 and a second vent 22 are respectively provided on both sides of the top of the tank 1. The bottom ends of the first vent 21 and the second vent 22 are connected to pipes that run through to the bottom of the baffle 4. The vent of the cathode chamber is used to discharge the hydrogen gas generated during the electrolysis process. In the cathode chamber, sodium ions pass through the cation exchange membrane into the cathode liquid and combine with the hydroxide ions generated by the electrolysis of water on the cathode to generate sodium hydroxide. At the same time, water molecules gain electrons at the cathode and are reduced to hydrogen gas. Hydrogen gas is a flammable and explosive gas and needs to be discharged from the vent in time to prevent the pressure in the cathode chamber from being too high and to ensure production safety. The tank 1 is equipped with a liquid replenishment and cooling mechanism 9 inside and outside.

[0021] A vertical cylinder 12 is rotatably connected to the surface of the partition 4. The vertical cylinder 12 passes through the partition 4 and is fixed to it at the point of penetration by bearings, thus achieving a rotatable connection. A transmission assembly 11 for driving the vertical cylinder 12 to rotate is provided on one side and inside the tank body 1. A first connecting rod 13 is welded to the lower surface of the vertical cylinder 12. A rib 14 is bolted to the other end of the first connecting rod 13. The rib 14 has a spiral design, and the pitch of the rib 14 decreases from top to bottom. Several micro-holes 15 are opened on the surface of the rib 14, and the inner diameter of the micro-holes 15 increases from the inside to the outside. The micropores 15 are designed to increase in size, with the middle side becoming smaller and the two side entrances becoming larger. Several breaking teeth 20 are fixed inside the micropores 15. Vertical tubes 16 are provided on both sides of the upper part of the tank 1. One set of vertical tubes 16 passes through the vertical cylinder 12 and is fixed to its inner wall by a sealed bearing, so that the vertical cylinder 12 will not be obstructed by the vertical tubes 16 during rotation. Another set of vertical tubes 91 passes through the partition 4. The vertical tubes 91 are used to connect the external connecting wires to the anode body 2 or the cathode body 3 respectively.

[0022] The electrolyte replenishment and cooling mechanism 9 includes vertical pipes 91, a first connecting pipe 92, and a second connecting pipe 93. There are two sets of vertical pipes 91, located on opposite sides of the ion membrane body 10, which is fixed inside the tank 1. One end of the first connecting pipe 92 is connected to the housing 7, and the other end is connected to one set of vertical pipes 91. One end of the second connecting pipe 93 is connected to the second replenishment port 6, and the other end is connected to the other set of vertical pipes 91. Several through holes 94 are formed on the surface of each vertical pipe 91. The through holes 94 on one set of vertical pipes 91 face the anode body 2, and the through holes 94 on the other set of vertical pipes 91 face the cathode body 3. During the operation of the electrolytic cell, the electrolyte passes through the first replenishment port 5, the housing 7, and the first connecting pipe 92, and then flows from... One set of vertical tubes 91 discharges electrolyte through the through-holes 94 on its surface, replenishing the electrolyte in the anode chamber. At the same time, pure water enters the interior of another set of vertical tubes 91 through the second replenishment port 6 and the first connecting pipe 92, and is discharged through the through-holes 94. The replenishment of pure water can dilute the cathode liquid. When the replenished liquid passes through the vertical tubes 91, the liquid temperature is lower than the temperature of the ion membrane body 10, absorbing heat to cool it down and prevent the ion membrane from wrinkling due to uneven thermal expansion during operation. The inner wall of the through-holes 94 is also provided with flexible membrane flaps 95. The flexible membrane flaps 95 are made of silicone. During the replenishment process, the hydraulic pressure inside the vertical tubes 91 can open the flexible membrane flaps 95, allowing the replenished liquid to enter the anode chamber or the cathode chamber respectively. At the same time, when the hydraulic pressure of the anode chamber or the cathode chamber is applied to the surface of the flexible membrane flaps 95, it can only close the flexible membrane flaps 95.

[0023] The transmission assembly 11 includes a turntable 111, blades 112, and a transmission rod 113. The turntable 111 is rotatably connected to the inside of the housing 7. Several blades 112 are fixed to the surface of the turntable 111. One end of the transmission rod 113 is fixed to the rotating shaft of the turntable 111, and the other end extends into the interior of the tank 1 and is connected to the vertical cylinder 12 via a bevel gear. The passage between the transmission rod 113 and the tank 1 is fixed to each other by a bearing, achieving a rotatable connection. When replenished liquid passes through the inside of the housing 7 (the liquid replenishment is achieved through a pump, increasing the pump pressure during replenishment), the liquid drives the blades 112 and the turntable 111 to rotate, thereby driving the transmission rod 113 to rotate. The transmission rod 113 then drives the vertical cylinder 12 to rotate via the bevel gear. The vertical cylinder 12 is connected to the first connecting rod 13... The rib 14 rotates, and the rib 14 captures air bubbles around the anode body 2 through the micropores 15. When the air bubbles enter the interior of the micropores 15, they are cut and broken by the breaking teeth 20, thereby preventing a large number of air bubbles from accumulating around the anode body 2, which would increase the effective resistance of the anode and affect the current efficiency. At the same time, the power generated by the replenishing liquid flow can save the energy consumption of the device. An insulating seat 17 is also fixed at the bottom inside the tank 1. The bottom end of the anode body 2 is fixed to the top of the insulating seat 17, which fixes the bottom of the anode body 2. A second connecting rod 19 is also bolted to the bottom of the surface of the rib 14. The other end of the second connecting rod 19 is bolted to a ring 18. The ring 18 is fitted onto the surface of the insulating seat 17 and rotates with it, providing a rotation support point for the rib 14 below, increasing the stability of the rotation.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for improving the current efficiency of an ion-exchange membrane electrochemical cell, comprising a cell body (1), an anode body (2), a cathode body (3), and an ion-exchange membrane body (10), characterized in that, Also includes: The first liquid inlet (5) and the second liquid inlet (6) are provided on both sides of the tank (1), and the tank (1) is provided with a liquid replenishment and cooling mechanism (9) inside and outside. A vertical cylinder (12) is rotatably connected to the surface of the partition (4). A transmission assembly (11) for driving the vertical cylinder (12) to rotate is provided on one side and inside the trough (1). A first connecting rod (13) is welded to the lower surface of the vertical cylinder (12). A rib (14) is bolted to the other end of the first connecting rod (13). A number of micro holes (15) are opened on the surface of the rib (14). A number of breaking teeth (20) are fixed inside the micro holes (15).

2. The device for improving the current efficiency of an ion-exchange membrane electrophoresis tank according to claim 1, characterized in that: The liquid replenishment and cooling mechanism (9) includes a vertical pipe (91), a first connecting pipe (92), and a second connecting pipe (93). There are two sets of vertical pipes (91) located on both sides of the ion membrane body (10). One end of the first connecting pipe (92) is connected to the box body (7), and the other end of the first connecting pipe (92) is connected to one of the sets of vertical pipes (91). One end of the second connecting pipe (93) is connected to the second liquid replenishment port (6), and the other end of the second connecting pipe (93) is connected to the other set of vertical pipes (91). Several through holes (94) are opened on the surface of the vertical pipe (91).

3. The device for improving the current efficiency of an ion-exchange membrane electrophoresis tank according to claim 2, characterized in that: One set of through holes (94) on the surface of the vertical tube (91) faces the anode body (2), and the other set of through holes (94) on the surface of the vertical tube (91) faces the cathode body (3).

4. The device for improving the current efficiency of an ion-exchange membrane electrophoresis tank according to claim 2, characterized in that: The inner wall of the through hole (94) is also provided with a flexible membrane flap (95).

5. The device for improving the current efficiency of an ion-exchange membrane electrophoresis tank according to claim 1, characterized in that: The transmission assembly (11) includes a turntable (111), blades (112) and a transmission rod (113). The turntable (111) is rotatably connected to the inside of the box (7). There are several blades (112) and they are fixed to the surface of the turntable (111). One end of the transmission rod (113) is fixed to the rotating shaft of the turntable (111). The other end of the transmission rod (113) extends into the inside of the groove (1) and is connected to the vertical cylinder (12) through a bevel gear. The passage of the transmission rod (113) and the groove (1) is fixed to each other through a bearing.

6. The apparatus for improving the current efficiency of an ion-exchange membrane electrophoresis tank according to claim 1, characterized in that: Vertical tubes (16) are provided on both sides of the upper part of the tank (1). One set of vertical tubes (16) passes through the vertical cylinder (12) and is fixed to its inner wall by a sealed bearing. The other set of vertical tubes (91) passes through the partition (4).

7. The apparatus for improving the current efficiency of an ion-exchange membrane electrophoresis tank according to claim 1, characterized in that: The top of the tank (1) is provided with a first air outlet (21) and a second air outlet (22) on both sides, and the bottom ends of the first air outlet (21) and the second air outlet (22) are connected to pipes that penetrate to the bottom of the partition (4).

8. The device for improving the current efficiency of an ion-exchange membrane electrophoresis tank according to claim 1, characterized in that: The tank (1) has a first liquid outlet (8) and a second liquid outlet (23) connected to both sides below the surface.

9. The device for improving the current efficiency of an ion-exchange membrane electrophoresis tank according to claim 1, characterized in that: An insulating seat (17) is fixed inside the lower part of the tank (1). The bottom end of the anode body (2) is fixed to the top of the insulating seat (17). A second connecting rod (19) is bolted to the lower part of the surface of the rib (14). A ring (18) is bolted to the other end of the second connecting rod (19). The ring (18) is fitted onto the surface of the insulating seat (17) and rotatedly connected to it.

10. The apparatus for improving the current efficiency of an ion-exchange membrane electrophoresis tank according to claim 1, characterized in that: The rib (14) is designed in a spiral shape, and the pitch of the rib (14) decreases from top to bottom. The inner diameter of the micropore (15) increases from the inside to the outside.

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