Large scale circulating electrolytic sodium hypochlorite generator
By implementing automated control and designing electrolysis units for large-scale circulating sodium hypochlorite generators, the problems of expensive electrode materials and low electrolysis efficiency in sodium hypochlorite generators have been solved, achieving high-efficiency production and low-cost operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN XINGDA TECH ENG
- Filing Date
- 2025-05-07
- Publication Date
- 2026-08-04
AI Technical Summary
Existing sodium hypochlorite generators suffer from problems such as expensive electrode materials, low electrolysis efficiency, and limited yield and concentration, resulting in high costs for large-scale production.
It adopts a detachable electrolysis unit design, combined with an automatic control system of valves and sensors, to realize the automatic monitoring and adjustment of the electrolysis unit. It supports multiple electrolysis units in series and external circulation electrolysis, enhances electrolysis time and pickling cycle, and uses electrodes made of precious metal or non-metal conductive materials.
It improves the yield and concentration of sodium hypochlorite, reduces the manpower and material resources for operation and maintenance, adapts to different production needs, reduces the amount of raw materials and acid used, and lowers operating costs.
Smart Images
Figure CN224591046U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of electrolysis equipment technology, and in particular relates to a large-scale circulating sodium hypochlorite generator. Background Technology
[0002] The disinfection principle of sodium hypochlorite is through hydrolysis to form hypochlorous acid, which further decomposes to form nascent oxygen. The extremely strong oxidizing properties of nascent oxygen can denature substances such as proteins in organisms, thereby killing pathogenic microorganisms and achieving the purpose of disinfection.
[0003] Currently, the main methods for adding sodium hypochlorite include adding a finished sodium hypochlorite solution and adding it on-site using a sodium hypochlorite generator. Compared to the instability, easy decomposition, and toxic chlorine gas produced during storage of finished high-concentration sodium hypochlorite, sodium hypochlorite generators using inexpensive and readily available industrial salt or dilute seawater solutions as raw materials are becoming increasingly widely used. However, due to limitations in electrode materials, electrolysis efficiency, and raw materials, the yield and concentration of traditional sodium hypochlorite generators have been restricted, resulting in high costs for large-scale production plants.
[0004] Existing technologies also include electrolysis equipment for the preparation of sodium hypochlorite. For example, Chinese patent CN216129679U discloses a utility model patent for a sodium hypochlorite generator. Its specification describes a box with a cover plate as an electrolysis cell, inside which are installed a spiral plate, a cathode sleeve, and an anode sleeve. The cathode and anode electrodes are located on opposite sides of the spiral plate, effectively extending the electrolysis time during the flow of concentrated brine and solving the problem of low yield in the aforementioned sodium hypochlorite generators. However, the anode conductive material of this device is carbon fiber, resulting in high electrode manufacturing costs. Furthermore, the electrode sleeve and spiral plate frequently require replacement during downtime, further increasing operating costs. Utility Model Content
[0005] The purpose of this invention is to provide a large-scale circulating sodium hypochlorite generator to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a large-scale circulating sodium hypochlorite electrolytic generator, comprising an electrolysis unit, an automatic control unit, and a pipeline support module; the electrolysis unit includes electrolysis electrodes and a matching electrolysis tank; the automatic control unit includes a valve unit and sensors for monitoring and regulating the electrolysis process; the pipeline support module includes a support for fixing the electrolysis unit and a support for fixing the control unit; the support for fixing the electrolysis unit is detachably connected to the electrolysis unit.
[0007] Preferably, the electrolysis unit includes four sub-units, namely a first sub-unit, a second sub-unit, a third sub-unit, and a fourth sub-unit.
[0008] Preferably, the four sub-units are provided with four unit cathode connectors and four unit anode connectors, the four unit cathode connectors being a first cathode connector, a second cathode connector, a third cathode connector, and a fourth cathode connector; the four unit anode connectors being a first anode connector, a second anode connector, a third anode connector, and a fourth anode connector, and the four unit cathode connectors and unit anode connectors are connected in series.
[0009] Preferably, the four sub-units are provided with a first water inlet, a second water inlet, a third water inlet and a fourth water inlet, and the four sub-units are provided with a first hydrogen removal tank, a second hydrogen removal tank, a third hydrogen removal tank and a fourth hydrogen removal tank.
[0010] Preferably, the valve unit includes an inlet valve, an outlet valve, an acid inlet valve, an acid extraction valve, an acid return valve, an evacuation valve, and a circulation valve.
[0011] Preferably, the first water inlet, the second water inlet, the third water inlet, and the fourth water inlet are all connected to a main water inlet pipe and a main water outlet pipe. The main water inlet pipe is connected to an inlet valve, and the main water outlet pipe is connected to an outlet valve.
[0012] Preferably, the electrolysis unit is connected to an acid inlet, an acid extraction inlet, an acid return inlet, and an air vent. The acid inlet is connected to an acid inlet valve, the acid extraction inlet is connected to an acid extraction valve, the acid return inlet is connected to an acid return valve, and the air vent is connected to an air vent valve.
[0013] Preferably, the first water inlet, the second water inlet, the third water inlet and the fourth water inlet are connected in series and form a circulation channel, and the circulation channel is connected to a circulation valve.
[0014] This utility model has at least the following beneficial effects: (1) This utility model utilizes the control and connection methods of valves and sensors to realize the automated control of sodium hypochlorite generator, reducing the manpower and material resources required for operation and maintenance; (2) This utility model realizes the integrated design of the electrolysis unit, and the number of electrolysis units can be increased in series according to actual production needs to meet the needs of various outputs; (3) This utility model realizes two cycles: First, the recycling of raw materials. When the number of electrolysis units connected in series is greater than 2, the same raw material is electrolyzed more than once, which prolongs the electrolysis time and increases the yield and concentration of sodium hypochlorite. At the same time, an external circulation pipeline is added. When the electrolysis cannot meet the rated demand, the external circulation pipeline is opened to carry out the recycling and re-electrolysis process. Second, the recycling of pickling solution. The pickling solution is pumped into the electrolysis unit and recovered by a centrifugal pump to realize the closed-loop circulation of pickling solution, reduce the amount of acid solution used, and reduce costs. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the medium-to-large-scale circulating electrolytic sodium hypochlorite generator of this utility model; Figure 2 This is a schematic diagram of the electrolysis unit in the medium-to-large-scale circulating sodium hypochlorite generator of this utility model; Figure 3 This is a schematic diagram of the inlet and outlet connections of the medium-to-large-scale circulating electrolytic sodium hypochlorite generator of this utility model.
[0016] In the attached diagram, the following are the reference numerals: 1. First sub-unit; 2. Second sub-unit; 3. Third sub-unit; 4. Fourth sub-unit; 11. First water inlet; 21. Second water inlet; 31. Third water inlet; 41. Fourth water inlet; 12. First hydrogen removal tank; 22. Second hydrogen removal tank; 32. Third hydrogen removal tank; 42. Fourth hydrogen removal tank; 13. First cathode connector; 23. Second cathode connector; 33. Third cathode connector; 43. Fourth cathode connector; 14. First anode connector; 24. Second anode connector; 34. Third anode connector; 44. Fourth anode connector; 111. Main water inlet pipe; 411. Main water outlet pipe; 112. Water inlet valve; 412. Water outlet valve; 113. Acid inlet valve; 114. Acid extraction valve; 413. Acid return valve; 414. Drain valve; 415. Circulation valve. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. Example
[0018] Please see Figure 1 , Figure 2 and Figure 3 This utility model provides a technical solution: a large-scale circulating sodium hypochlorite generator, including an electrolysis unit, an automatic control unit, and a pipe support module; the electrolysis unit includes electrolysis electrodes and a matching electrolysis tank; the automatic control unit includes a valve unit and sensors for monitoring and regulating the electrolysis process; the pipe support module includes a support for fixing the electrolysis unit and a support for fixing the control unit; the support for fixing the electrolysis unit can be detachably connected to the electrolysis unit.
[0019] Furthermore, the electrolysis unit includes four sub-units, namely the first sub-unit 1, the second sub-unit 2, the third sub-unit 3, and the fourth sub-unit 4.
[0020] Furthermore, each of the four sub-units is provided with a corresponding four unit cathode connectors and four unit anode connectors. The four unit cathode connectors are the first cathode connector 13, the second cathode connector 23, the third cathode connector 33, and the fourth cathode connector 43; the four unit anode connectors are the first anode connector 14, the second anode connector 24, the third anode connector 34, and the fourth anode connector 44. The four unit cathode connectors and the unit anode connectors are connected in series.
[0021] Furthermore, the four sub-units are respectively provided with a first water inlet 11, a second water inlet 21, a third water inlet 31 and a fourth water inlet 41, and the four sub-units are respectively provided with a first hydrogen removal tank 12, a second hydrogen removal tank 22, a third hydrogen removal tank 32 and a fourth hydrogen removal tank 42.
[0022] Furthermore, the valve unit includes an inlet valve 112, an outlet valve 412, an acid inlet valve 113, an acid extraction valve 114, an acid return valve 413, an vent valve 414, and a circulation valve 415.
[0023] Furthermore, the first water inlet 11, the second water inlet 21, the third water inlet 31 and the fourth water inlet 41 are connected to a main water inlet pipe 111 and a main water outlet pipe 411. The main water inlet pipe 111 is connected to an inlet valve 112, and the main water outlet pipe 411 is connected to an outlet valve 412.
[0024] Furthermore, the electrolysis unit is connected to an acid inlet, an acid extraction port, an acid return port, and an air vent. The acid inlet is connected to an acid inlet valve 113, the acid extraction port is connected to an acid extraction valve 114, the acid return port is connected to an acid return valve 413, and the air vent is connected to an air vent valve 414.
[0025] Furthermore, the first inlet 11, the second inlet 21, the third inlet 31 and the fourth inlet 41 are connected in series and form a circulation channel, which is connected to a circulation valve 415.
[0026] In this embodiment: The pipeline support module includes supports for fixing the electrolysis unit and supports for fixing the control unit, forming a skid-mounted design to increase space utilization and reduce installation and maintenance difficulty; the pipeline support module includes supports for fixing the electrolysis unit and supports for fixing the control unit, forming a skid-mounted design to increase space utilization and reduce installation and maintenance difficulty.
[0027] The electrolytic electrode is a bipolar plate electrode, wherein the anode can be a precious metal such as platinum, ruthenium, or titanium, coated with a multi-element oxide nano-coating or a non-metallic conductive material such as graphite or silicon carbide; the cathode can be a pure material corresponding to the anode or a material such as stainless steel.
[0028] The four sub-units are electrolytic cells, which are square or cylindrical, and are matched with the arrangement and size of the electrolytic electrodes. The cell material includes, but is not limited to, non-conductive materials such as fiberglass, plexiglass, and resin. The liquid flow in the electrolytic cell is bottom-in and top-out.
[0029] The valve is one or more of the following automatic control valves: electric ball valve, pneumatic ball valve, electric butterfly valve, etc.; the sensor includes one or more of the following: temperature sensor, pressure sensor, flow sensor, sodium hypochlorite concentration sensor, available chlorine sensor, etc.
[0030] The specific process for producing sodium hypochlorite through electrolysis using this device is as follows: Close all valves, open the inlet and outlet water valves, and sequentially fill the electrolysis unit with the electrolysis feedstock (seawater or industrial brine). Then, turn on the power supply connected to the anode and cathode electrodes, and an electrolysis reaction occurs to produce sodium hypochlorite and hydrogen gas. During the liquid flow, the hydrogen gas undergoes gas-liquid separation through a hydrogen removal tank and is discharged separately, reducing the risk of flammability and explosion. After electrolysis for a period of time, the electrolysis unit needs to be acid-washed to remove scale and restore its electrolysis capacity. The operation involves closing all valves, opening the acid inlet and return valves, and using a centrifugal pump to circulate the acid solution within the electrolysis unit for acid washing to remove scale from the electrode surfaces. After acid washing, close all valves, open the acid extraction valve, and extract the residual acid solution from the electrolysis unit. When equipment maintenance is required, the operation involves closing all valves, opening the drain valve, draining the liquid from the electrolysis unit, and then performing maintenance. When the sodium hypochlorite concentration produced is insufficient to meet production requirements, the circulation valve is opened, and the openings of the inlet and outlet valves are adjusted, allowing a certain amount of raw material to return to the electrolysis unit for further electrolysis. This cycle continues until the sodium hypochlorite concentration meets the requirements. All of the above processes can be automated by changing the control and connection methods of valves and sensors. For example, by connecting the sodium hypochlorite concentration sensor to the inlet, outlet, and circulation electric valves, the circulation valve will automatically open and the openings of the inlet and outlet valves will be adjusted when the concentration falls below the set value. The method and degree of automation can be adjusted according to actual needs, enabling fully automated operation.
[0031] The above technical solutions utilize cyclic electrolysis on the basis of safe and stable operation to improve the yield and concentration of sodium hypochlorite; at the same time, automatic cyclic acid washing and descaling are carried out to increase the service life of the generator and reduce the operating cost of the sodium hypochlorite generator, making them suitable for various production needs.
[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.
[0033] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A large-scale circulating electrolytic sodium hypochlorite generator, characterized in that, It includes an electrolysis unit, an automatic control unit, and a pipe support module; the electrolysis unit includes electrolysis electrodes and a matching electrolysis tank; the automatic control unit includes a valve unit and sensors for monitoring and regulating the electrolysis process; the pipe support module includes a support for fixing the electrolysis unit and a support for fixing the control unit; the support for fixing the electrolysis unit can be detachably connected to the electrolysis unit.
2. A large scale circulating electrolytic sodium hypochlorite generator according to claim 1, characterized in that: The electrolysis unit includes four sub-units, namely the first sub-unit (1), the second sub-unit (2), the third sub-unit (3), and the fourth sub-unit (4).
3. A large scale circulating electrolytic sodium hypochlorite generator according to claim 2, characterized in that: The four sub-units are provided with four unit cathode connectors and four unit anode connectors. The four unit cathode connectors are the first cathode connector (13), the second cathode connector (23), the third cathode connector (33), and the fourth cathode connector (43); the four unit anode connectors are the first anode connector (14), the second anode connector (24), the third anode connector (34), and the fourth anode connector (44). The four unit cathode connectors and the unit anode connectors are connected in series.
4. A large scale circulating electrolytic sodium hypochlorite generator according to claim 2, characterized in that: The four sub-units are respectively provided with a first water inlet (11), a second water inlet (21), a third water inlet (31) and a fourth water inlet (41), and the four sub-units are respectively provided with a first hydrogen removal tank (12), a second hydrogen removal tank (22), a third hydrogen removal tank (32) and a fourth hydrogen removal tank (42).
5. A large scale circulating electrolytic sodium hypochlorite generator according to claim 4, characterized in that: The valve unit includes an inlet valve (112), an outlet valve (412), an acid inlet valve (113), an acid extraction valve (114), an acid return valve (413), an vent valve (414), and a circulation valve (415).
6. A large scale circulating electrolytic sodium hypochlorite generator according to claim 5, characterized in that: The first water inlet (11), the second water inlet (21), the third water inlet (31) and the fourth water inlet (41) are connected to a main water inlet pipe (111) and a main water outlet pipe (411). The main water inlet pipe (111) is connected to an inlet valve (112), and the main water outlet pipe (411) is connected to an outlet valve (412).
7. A large scale circulating electrolytic sodium hypochlorite generator according to claim 5, characterized in that: The electrolysis unit is connected to an acid inlet, an acid extraction port, an acid return port, and an air vent. The acid inlet is connected to an acid inlet valve (113), the acid extraction port is connected to an acid extraction valve (114), the acid return port is connected to an acid return valve (413), and the air vent is connected to an air vent valve (414).
8. A large scale circulating electrolytic sodium hypochlorite generator according to claim 5, characterized in that: The first water inlet (11), the second water inlet (21), the third water inlet (31) and the fourth water inlet (41) are connected in series and form a circulation channel, which is connected to a circulation valve (415).