Electrolysis unit in electrolysis device for sodium chlorate production
By using PTFE corrugated pipes and conductive flexible joints in the sodium chlorate production electrolysis unit to cut off the loop current, the problems of useless power consumption and electrochemical corrosion caused by the conductivity of metal pipelines were solved, improving electrolysis efficiency and production stability, and reducing maintenance costs.
Patent Information
- Application Number
- CN202520233877.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-14
AI Technical Summary
In the existing sodium chlorate production process, the conductivity of metal pipelines creates loop currents, leading to increased waste power consumption and electrochemical corrosion, which affects production stability and equipment maintenance costs.
Polytetrafluoroethylene (PTFE) corrugated pipes are used as electrical insulation materials to replace the conductive connections between the electrolytic cell and the reactor using metal pipes. Conductive flexible connectors are used to connect the electrolytic cell, cutting off the loop current and reducing unnecessary energy consumption and electrochemical corrosion.
It improves electrolysis efficiency, reduces waste energy consumption, enhances the production stability of the electrolysis unit, and lowers equipment maintenance costs.
Smart Images
Figure CN223705764U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of chemical equipment, and particularly relates to an electrolysis unit in a sodium chlorate production electrolysis device. BACKGROUND
[0002] In the chemical production of sodium chlorate produced by electrolysis, electrolysis is a key process link, and the purpose is to convert sodium chloride solution into sodium chlorate through electrolysis reaction, and the device for realizing the electrolysis reaction is called an electrolysis device. The electrolysis device usually includes a transformer, a rectifier, a large current switch, an electrolysis tank, a reactor and other equipment and supporting pipelines and supporting circuits.
[0003] The electrolysis tank is composed of a cathode and an anode, and is usually connected in series by multiple electrolysis tanks. Direct current is passed through the electrolysis tank to cause the internal sodium chloride aqueous solution to undergo an electrolysis reaction to produce sodium ions, chlorate ions, hydroxide ions, hydrogen gas, chlorine gas and other gases. The electrolyte is driven by a large amount of gas bubbles to enter the upper part of the reactor through the riser pipe, and sodium chlorate is generated in the reactor after gas-liquid separation. The electrolyte that has not been completely reacted returns to the electrolysis tank through the lower inlet pipe connected to the lower part of the reactor to undergo electrolysis again, forming a circulating flow of electrolyte.
[0004] Because the electrolyte is highly corrosive, under the combined action of high temperature and reaction gas, it can cause corrosion to the related components and pipelines through which the fluid flows. Therefore, the industry usually uses titanium material with good corrosion resistance for the anode of the electrolysis tank, the reactor and the pipelines, but the cost is high.
[0005] In addition, because the electrolysis tanks at different positions have different potentials, but are connected in metal through the upper and lower pipelines and the same reactor, an electric conduction loop is formed. Although the industry uses an insulating sheet to cut off the conduction, the electrolyte flowing through the insulating sheet can also conduct electricity, which still produces loop current and increases the consumption of useless electric energy. SUMMARY
[0006] To solve the above problems, the application provides an electrolysis unit in a sodium chlorate production electrolysis device, which cuts off the loop current caused by the conduction of the metal pipeline, reduces the consumption of useless electric energy, equivalent to improving the electrolysis efficiency, effectively reducing the electrochemical corrosion of the metal pipe body, enhancing the production stability of the electrolysis device, and reducing the maintenance cost of the related equipment.
[0007] To achieve the above purpose, the application provides the following technical solutions:
[0008] The electrolytic unit described in the present application comprises a reactor and a set of electrolytic cells connected in series, each electrolytic cell comprising an electrolytic cell cathode and an electrolytic cell anode, each electrolytic cell being provided with an upcomer and a downcomer connected to the reactor, and a PTFE bellow being provided between the electrolytic cell and the upcomer, between the electrolytic cell and the downcomer, between the reactor and the upcomer, and between the reactor and the downcomer;
[0009] The upcomer and the downcomer are both steel lined PTFE pipes.
[0010] The electrolytic cell cathode and the electrolytic cell anode are both connected with a conductive flexible joint. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 The figure is a schematic view of the elevation of the electrolytic unit described in the present application, showing the connection relationship between the electrolytic cell and the reactor, and the arrows in the figure indicate the up and down directions described in the present application.
[0012] Figure 2 The figure is a schematic view of the top view of the electrolytic unit described in the present application, showing the interconnection relationship of a set of electrolytic cells.
[0013] The numbers in the above figures are as follows: reactor 1, PTFE bellow 2, upcomer 3, downcomer 4, electrolytic cell 5, electrolytic cell cathode 51, electrolytic cell anode 52, and conductive flexible joint 53. DETAILED DESCRIPTION
[0014] In combination with the above figures, the specific implementation of the present application is described as follows:
[0015] The present application proposes an electrolytic unit in a sodium chlorate production electrolysis device, and one or more such electrolytic units are contained in a set of electrolysis device.
[0016] The electrolytic unit comprises a reactor 1 and a set of electrolytic cells 5 connected in series, as shown in Figure 1 The upper end of each electrolytic cell 5 is sequentially connected with a PTFE bellow 2, an upcomer 3, a PTFE bellow 2, and then communicates with the upper part of the reactor 1; the lower end of each electrolytic cell 5 is sequentially connected with a PTFE bellow 2, a downcomer 4, a PTFE bellow 2, and then communicates with the lower part of the reactor 1.
[0017] The upcomer 3 and the downcomer 4 are both steel lined PTFE pipes, and the PTFE lining has the functions of electrical insulation and electrolyte isolation.
[0018] As shown in Figure 2As shown, each electrolytic cell 5 comprises an electrolytic cell cathode 51 and an electrolytic cell anode 52, both of which are connected with a conductive soft joint 53, the electrolytic cell cathode 51 of the electrolytic cell 5 is connected with the electrolytic cell anode 52 of the adjacent electrolytic cell 5 through the conductive soft joint 53, forming a group of series-connected electrolytic cell groups, and the conductive soft joints 53 at both ends are connected with the positive and negative poles of the direct current respectively.
[0019] When the sodium chlorate production electrolysis device is in normal production, the series-connected electrolytic cell groups are supplied with direct current, the sodium chloride aqueous solution inside the electrolytic cell 5 undergoes electrolysis reaction to produce sodium ions, chlorate ions, hydroxide ions, hydrogen gas, chlorine gas and the like, the electrolyte is driven by a large amount of bubbles to enter the upper part of the reactor 1 through the riser 3, and after gas-liquid separation, sodium chlorate is generated in the reactor 1, the completed sodium chlorate solution is output through the production outlet, enters the subsequent process, and the electrolyte that has not been reacted is returned to the electrolytic cell 5 through the lower inlet pipe 4 connected to the lower part of the reactor 1 for electrolysis again, forming an electrolyte flow circulation.
[0020] The electrolytic unit described in the present application has the following beneficial effects:
[0021] The four-fluoro corrugated pipe 2 is an electrical insulator, which breaks the metal conductive connection between the electrolytic cell 5 and the riser 3 and the lower inlet pipe 4, and between the reactor 1 and the riser 3 and the lower inlet pipe 4, cuts off the loop current caused by the metal pipeline conductive between different electrolytic cells 5, reduces the consumption of useless electric energy, and equivalently improves the electrolysis efficiency;
[0022] The polytetrafluoroethylene lining in the riser 3 and the lower inlet pipe 4 is also an electrical insulator, which blocks the conductive of the liquid column in the pipe through the metal pipe body, and also isolates the electrolyte from contacting the metal pipe body, effectively reduces the electrochemical corrosion of the metal pipe body, enhances the production stability of the electrolysis device, and also reduces the maintenance cost of the related equipment;
[0023] The series-connected electrolytic cells 5 are connected by the conductive soft joint 53, which can facilitate the disassembly and maintenance of each electrolytic cell 5.
Claims
1. An electrolytic unit in a sodium chlorate production electrolytic device, comprising a reactor (1) and a series of electrolytic cells (5), each electrolytic cell (5) comprising an electrolytic cell cathode (51) and an electrolytic cell anode (52), each electrolytic cell (5) being connected to the reactor (1) by means of an upcomer (3) and a downcomer (4), characterized in that: Four fluorine corrugated pipes (2) are arranged between the electrolytic cell (5) and the rising pipe (3), between the electrolytic cell (5) and the lower inlet pipe (4), between the reactor (1) and the rising pipe (3), and between the reactor (1) and the lower inlet pipe (4); the rising pipe (3) and the lower inlet pipe (4) are both made of steel lined four fluorine pipes. 2. An electrolytic cell according to claim 1, characterised in that: The electrolytic cell cathode (51) and the electrolytic cell anode (52) are both connected with conductive soft joints (53).