A sodium hypochlorite generator

Abstract

This utility model belongs to the field of tap water disinfection and discloses a sodium hypochlorite generator, including a pair of reaction tanks. Each reaction tank contains an electrolytic cell and end caps on both sides. A salt dissolving tank and a solution storage tank are connected to each side of the reaction tank via pipelines. A brine pump and a brine flow and temperature sensor are installed between the reaction tanks and the salt dissolving tank. A water softener is installed on the pipeline on the side of the salt dissolving tank furthest from the reaction tank, and a dosing system is installed on the pipeline on the side of the solution storage tank furthest from the reaction tank. Both the reaction tanks and the solution storage tank are connected to a hydrogen recovery and treatment system. The two reaction tanks are arranged vertically and have matching series pipe interfaces, which are connected by pipelines. This utility model has a reasonable structural layout, high reaction stability, and good sealing performance.

Description

Technical Field

[0001] This utility model belongs to the field of tap water disinfection, and relates to a generator, particularly a sodium hypochlorite generator. Background Technology

[0002] In tap water disinfection and sterilization, sodium hypochlorite aqueous solution is non-toxic to humans and has excellent bactericidal effects, leading to its increasingly widespread application in the water treatment field. A common method for preparing sodium hypochlorite aqueous solution is electrolysis of the salt solution (sodium chloride solution). The specific electrolysis process involves placing sodium chloride in an electrolytic cell, connecting one electrode of the cell to a power source, and initiating electrolysis after power is applied. During electrolysis, chloride ions and sodium ions are generated in the sodium chloride aqueous solution. These chloride and sodium ions then react with water molecules to produce sodium hypochlorite and hydrogen gas. The sodium hypochlorite generator is a crucial piece of equipment in the entire tap water production process.

[0003] Because it occurs in water, the hydrogen gas eventually rises and overflows, while sodium hypochlorite dissolves in the water to form a sodium hypochlorite aqueous solution. Electrolysis generates heat, and excessively high temperatures can adversely affect the equipment. Therefore, it is necessary to control the temperature of the electrolytic cell, prepare a suitable sodium chloride aqueous solution, and control its concentration. The sodium hypochlorite aqueous solution needs to be supplied in a quantitative manner. The sodium hypochlorite generator has a variety of components such as a reaction vessel, an electrolytic cell, a sodium hypochlorite aqueous solution storage tank, a pump, and a salt dissolving tank, which are arranged and coordinated in a reasonable manner. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by proposing a sodium hypochlorite generator with a reasonable structural layout, high reaction stability and good sealing performance.

[0005] The technical problem to be solved by this utility model is achieved through the following technical solution: a sodium hypochlorite generator, comprising a pair of reaction tanks, an electrolytic cell inside the reaction tanks, end caps on both sides of the reaction tanks, a salt dissolving tank and a solution storage tank connected to both sides of the reaction tanks respectively by pipelines, a brine pump and a brine flow and temperature sensor between the reaction tanks and the salt dissolving tanks, a water softener on the pipeline on the side of the salt dissolving tank away from the reaction tank, and a dosing system on the pipeline on the side of the solution storage tank away from the reaction tank; both the reaction tanks and the solution storage tank are connected to a hydrogen recovery and treatment system; the two reaction tanks are arranged vertically and are provided with matching series pipe interfaces, and the series pipe interfaces on the two reaction tanks are connected by pipelines.

[0006] Preferably, the bottom of the reaction tank located below is provided with an inlet connected to a salt dissolving tank, the top of the reaction tank located above is provided with an outlet connected to a solution storage tank, and the top of the reaction tank located below is provided with an exhaust port connected to a hydrogen recovery and treatment system.

[0007] Preferably, the reaction tank at the top is equipped with a reaction tank level sensor, and the solution storage tank is equipped with a solution storage tank level sensor.

[0008] Preferably, the pipeline connecting the outlet of the reaction vessel and the solution storage tank is connected to the hydrogen recovery and treatment system.

[0009] Preferably, the reaction vessel has reserved interfaces on the top and sides.

[0010] Preferably, the end caps are transparent PC caps, the reaction vessel is a fiberglass vessel, and the end caps are connected to both ends of the reaction vessel via flanges.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: the reaction vessel of this utility model is set up at the top and bottom, and the liquid inlet, liquid outlet, exhaust port and series position are reasonably arranged to improve the stability of the reaction and facilitate the discharge of solution and gas; the components of this utility model are tightly fitted, have good sealing performance, good reaction stability, are not easy to leak, can effectively reduce the frequency of maintenance, reduce production costs and improve service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the reaction vessel located at the bottom; Figure 3 This is a schematic diagram of the end cap structure.

[0013] 1. Reaction tank; 2. Electrolytic cell; 3. Water softener; 4. Salt dissolving tank; 5. Brine pump; 6. Brine flow and temperature sensor; 7. Reaction tank level sensor; 8. Hydrogen recovery and treatment system; 9. Solution storage tank level sensor; 10. Solution storage tank; 11. Dosing system; 101. Inlet; 102. Series pipe interface; 103. Exhaust port; 104. Outlet; 105. End cap. Detailed Implementation

[0014] A sodium hypochlorite generator, such as Figure 1-3 As shown, the system includes a pair of reaction tanks 1, each containing an electrolytic cell 2. End caps 105 are located on both sides of the reaction tanks 1. A salt dissolving tank 4 and a solution storage tank 10 are connected to each side of the reaction tanks 1 via pipelines. A brine pump 5 and a brine flow and temperature sensor 6 are located between the reaction tanks 1 and the salt dissolving tank 4. A water softener 3 is located on the pipeline on the side of the salt dissolving tank 4 furthest from the reaction tank 1, and a dosing system 11 is located on the pipeline on the side of the solution storage tank 10 furthest from the reaction tank 1. Both the reaction tanks 1 and the solution storage tank 10 are connected to a hydrogen recovery and treatment system 8. The two reaction tanks 1 are arranged vertically and have matching series pipe interfaces 102, which are connected by pipelines.

[0015] The reaction tank 1 located at the bottom is provided with an inlet 101 connected to the salt dissolving tank 4, and the reaction tank 1 located at the top is provided with an outlet 104 connected to the solution storage tank 10. The reaction tank 1 located at the bottom is provided with an exhaust port 103 connected to the hydrogen recovery and treatment system 8. The reaction tank 1 located at the top is provided with a reaction tank level sensor 7, and the solution storage tank 10 is provided with a solution storage tank level sensor 9. The pipeline connecting the outlet 104 of the reaction tank 1 and the solution storage tank 10 is connected to the hydrogen recovery and treatment system 8. The top and side of the reaction tank 1 are provided with reserved interfaces.

[0016] End cap 105 is a transparent PC cap. The high transparency of the transparent PC cap makes it easy to observe the liquid level and scaling inside the tank, and it also has high stability and high temperature resistance. The reaction tank 1 is a fiberglass tank. Fiberglass tanks have better pressure resistance, high temperature resistance, and corrosion resistance. End cap 10 is connected to both ends of the reaction tank 1 by flanges, which has good sealing performance, is not easy to be damaged, and makes it easier to process and replace maintenance parts. The electrode center hole of end cap 10 adopts a PTFE silicone high temperature resistant O-ring seal, and the high temperature resistant threaded cap is used for tight sealing. The electrode short joints of the upper and lower reaction tanks 1 are replaced with copper busbar flexible connections, which not only reduces the number of joints, but also increases the current carrying capacity to prevent overheating, and facilitates adjustment of the installation angle.

[0017] Tap water is mixed in the pipeline at the front end of the inlet 101 of the reaction tank 1 via the water softener 3 and the salt dissolving tank 4. The mixed soft brine forms an electrolyte in the reaction tank 1 through the electrolysis cell 2, and reacts to produce sodium hypochlorite solution and a small amount of hydrogen gas. The sodium hypochlorite solution flows into the solution storage tank 10 through the outlet 104 of the upper reaction tank 1, and the small amount of hydrogen gas flows into the hydrogen recovery and treatment system 5 through the exhaust port 103 of the lower reaction tank 1. The solution storage tank 10 is connected to the dosing system 11 and enters the tap water pipeline for disinfection and sterilization.

[0018] The inlet 101 of the reaction tank 1 is connected to the brine pipe, allowing the brine to enter the reaction tank 1 and undergo ionization and decomposition under the action of the electrolytic cell 2 to form sodium hypochlorite solution and hydrogen gas. The exhaust port 103 is connected to the hydrogen exhaust pipe, allowing the small amount of hydrogen gas produced by the reaction to safely flow into the hydrogen recovery and treatment system 5. The outlet 104 of the reaction tank 1 is connected to the sodium hypochlorite solution pipe, allowing the produced sodium hypochlorite solution to flow into the solution storage tank 10. A sodium hypochlorite solution generation system consists of two reaction tanks 1 arranged vertically. The two reaction tanks 1 are equipped with a series pipe interface 102 at corresponding positions and are connected together by a series pipe. The bottom of the upper reaction tank 1 is equipped with a series pipe interface 102, and the top of the lower reaction tank 1 is equipped with a corresponding series pipe interface 102, which is used to connect the upper and lower reaction tanks 1 in series.

[0019] The end cap 105 is made of transparent PC material, which not only meets the process requirements for observing the liquid level in the tank, but also has good high temperature resistance and corrosion resistance. It can withstand temperatures up to 130-150℃. It will not easily melt when the electrolytic cell fails to burn dry, and the end cap 105 will not be easily damaged, greatly improving its service life. Figure 2 The unmarked tank interfaces on reaction vessel 1 are reserved interfaces, which can be used to install monitoring instruments such as sodium hypochlorite turbidity sensors and sodium hypochlorite temperature sensors according to the production process requirements. All interfaces on reaction vessel 1 are flange interfaces, which solves the drawbacks of the original threaded interfaces that are prone to cracking and damage and cannot be repaired after damage. In addition, the sealing performance is better and maintenance is more convenient and faster.

[0020] The reaction tank level sensor 7 is installed on the reaction tank 1 to ensure that the soft brine level in the reaction tank 1 meets the process requirements and to prevent the electrolyzer 2 from being damaged by dry burning; the solution storage tank level sensor 9 is installed on the solution storage tank 10. When the upper limit of the liquid level in the solution storage tank 10 meets the process requirements, the working state of the reaction tank 1 and the electrolyzer 2 in the reaction tank 1 will be stopped.

Claims

1. A sodium hypochlorite generator, characterized by, The system includes a pair of reaction tanks, each containing an electrolytic cell. End caps are located on both sides of the reaction tanks. A salt dissolving tank and a solution storage tank are connected to each side of the reaction tanks via pipelines. A brine pump and a brine flow and temperature sensor are installed between the reaction tanks and the salt dissolving tank. A water softener is installed on the pipeline on the side of the salt dissolving tank furthest from the reaction tank, and a dosing system is installed on the pipeline on the side of the solution storage tank furthest from the reaction tank. Both the reaction tanks and the solution storage tank are connected to a hydrogen recovery and treatment system. The two reaction tanks are positioned vertically and equipped with matching series pipe interfaces, which are connected by pipelines.

2. The sodium hypochlorite generator of claim 1, wherein, The reaction tank located at the bottom has an inlet connected to the salt dissolving tank, the reaction tank located at the top has an outlet connected to the solution storage tank, and the reaction tank located at the bottom has an exhaust port connected to the hydrogen recovery and treatment system.

3. The sodium hypochlorite generator of claim 2, wherein, The reaction tank at the top is equipped with a reaction tank level sensor, and the solution storage tank is equipped with a solution storage tank level sensor.

4. The sodium hypochlorite generator of claim 3, wherein, The pipeline connecting the outlet of the reaction vessel and the solution storage tank is connected to the hydrogen recovery and treatment system.

5. The sodium hypochlorite generator of claim 4, wherein, The reaction vessel has reserved interfaces on the top and sides.

6. The sodium hypochlorite generator of claim 5, wherein, The end caps are transparent PC caps, and the reaction vessel is a fiberglass vessel. The end caps are connected to both ends of the reaction vessel via flanges.

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