A sodium hypochlorite production system

Abstract

This utility model relates to the field of sodium hypochlorite production technology and discloses a sodium hypochlorite production system, including a feeding unit, an electrolysis unit, and a storage unit. The feeding unit includes a softening section, a heat exchange section, and a salt dissolving section. The softening section generates softened water. The heat exchange section and the salt dissolving section are connected in parallel on one side of the softening section. The heat exchange section is used to regulate the temperature of the softened water to generate dilution water. The salt dissolving section is used to dissolve the softened water and salt to obtain brine. The electrolysis unit includes a dilution tank and an electrolytic cell. The dilution tank is used to mix and dilute the dilution water and the brine to obtain diluted brine. The electrolytic cell is used to electrolyze the diluted brine to generate sodium hypochlorite. The storage unit is used to store the sodium hypochlorite generated by the electrolysis unit. This utility model has the beneficial effect of high sodium hypochlorite production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sodium hypochlorite production technology, and specifically to a sodium hypochlorite production system. Background Technology

[0002] Chlorination disinfection is currently the most widely used water disinfection method, playing an important role in preventing waterborne diseases. Adding chlorine or hypochlorite (such as NaClO) to water generally produces hypochlorous acid (HClO) and hydrochloric acid (HIC), thus achieving sterilization and disinfection. Sodium hypochlorite, as a representative bleaching agent and disinfectant, is used in various aspects of water treatment, sewage treatment, and wastewater treatment. The production of sodium hypochlorite typically involves reacting chlorine obtained from the electrolysis of brine with an aqueous solution of sodium hydroxide in a reaction tank.

[0003] For example, patent document CN108193223B discloses a hypochlorite production system. This system includes a hypochlorite generator and may further include a salt dissolving tank, a water softener, a storage tank, a dispensing system, and a PLC control cabinet. The hypochlorite generator includes an electrolytic cell; the electrolytic cell includes a shell, an electrode assembly, multiple baffles, and two seals. The electrode assembly is located inside the shell. The multiple baffles each have through holes and are spaced apart on the electrode assembly. The baffles are located between the electrode assembly and the inner wall of the shell and are sealed to the shell. The two seals are respectively sealed at both ends of the shell. During the electrolysis process of the above-mentioned hypochlorite production system, under the beam action of the baffles, the electrolytic cell can ensure that all the salt solution flows between the anode and cathode plates of the electrode assembly, reducing the mass transfer distance and improving the electrolysis efficiency.

[0004] While the above-mentioned technical solution can achieve efficient electrolytic production of sodium hypochlorite, the salt solution is easily affected by the ambient temperature during the process of transporting it to the electrolytic cell. When the ambient temperature is low, such as in winter, the temperature of the salt solution transported to the electrolytic cell can easily become too low, reducing the conductivity of the salt solution and causing a decrease in electrolytic efficiency. This increases energy consumption during the electrolysis process. In addition, low temperature also slows down the electrolytic reaction rate, reducing the sodium hypochlorite production efficiency and resulting in a lower concentration of sodium hypochlorite produced by electrolysis. This leads to waste of raw materials and increases the production cost of sodium hypochlorite. Furthermore, when the salt solution temperature is too low, the temperature distribution within the electrolytic cell is uneven, affecting the stability of equipment operation. Utility Model Content

[0005] The present invention aims to provide a sodium hypochlorite production system to solve the technical problems of low electrolysis efficiency and unstable equipment operation at low temperatures in the prior art.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a sodium hypochlorite production system, comprising a feeding unit, an electrolysis unit, and a storage unit. The feeding unit includes a softening section, a heat exchange section, and a salt dissolving section. The softening section is used to generate softened water. The heat exchange section and the salt dissolving section are distributed in parallel on one side of the softening section. The heat exchange section is used to regulate the temperature of the softened water to generate dilution water. The salt dissolving section is used to dissolve the softened water and salt to obtain brine. The electrolysis unit includes a dilution tank and an electrolytic cell. The dilution tank is used to mix and dilute the dilution water and the brine to obtain diluted brine. The electrolytic cell is used to electrolyze the diluted brine to generate sodium hypochlorite. The storage unit is used to store the sodium hypochlorite generated by the electrolysis unit.

[0007] The principle and advantages of this scheme are as follows: In the production of sodium hypochlorite, water is softened and then the temperature is adjusted through a heat exchanger to form dilution water. Sodium chloride is dissolved in a salt dissolving section to obtain brine. The dilution water and brine are mixed in proportion in a dilution tank in the electrolysis unit to dilute the sodium chloride concentration in the water to obtain a diluted brine solution with a certain ratio. The diluted brine solution is then transported to an electrolysis cell for electrolytic processing to produce sodium hypochlorite. The electrolyzed product is then transported to a storage unit for storage.

[0008] In this scheme, during the production of sodium hypochlorite, the raw water is softened and then heated and dissolved separately. This allows for adjustment of the ratio of dilution water to brine according to actual needs, ensuring that the concentration of the diluted brine matches the actual requirements during production. This guarantees the efficiency of the brine electrolysis and prevents the efficiency of sodium hypochlorite production from being affected by excessively high or low brine concentrations. Furthermore, by regulating the temperature of the dilution water, the temperature of the diluted brine is maintained within a preset range during production, preventing the temperature of the diluted brine from dropping too low due to external environmental influences, which would affect the efficiency of the electrolysis process.

[0009] Preferably, as an improvement, the temperature adjustment range of the dilution water in the heat exchange section is 15℃-27℃. This ensures that the temperature of the dilution water is within the suitable temperature range for electrolytic processing, guaranteeing that the dilution water and brine can be directly electrolyzed after mixing. This improves the convenience of electrolytic processing while avoiding setting the dilution water temperature too high, which would increase the energy demand of the heat exchange section, increase production costs, and lead to resource waste.

[0010] Preferably, as an improvement, the brine formed in the salt-dissolving section is saturated brine. This allows the concentration of the brine to be maintained within a relatively constant range, improving the efficiency of the brine delivery from the salt-dissolving section to the electrolysis section, while also facilitating the calculation of the ratio when mixing and diluting the brine with dilution water.

[0011] Preferably, as an improvement, the storage unit includes a storage tank for storing sodium hypochlorite generated by the electrolysis unit; the storage unit also includes an exhaust section, which includes a fan connected to the storage tank via a gas supply pipe, the fan being used to supply air into the storage tank; the storage tank is also equipped with an exhaust pipe for discharging the gas inside the storage tank. This allows the hydrogen and other gaseous byproducts generated from the electrolyzed sodium hypochlorite stored in the storage tank to be discharged promptly through the exhaust section, preventing excessive accumulation of hydrogen in the storage tank and increasing the risk of explosion.

[0012] Preferably, as an improvement, the air flow rate supplied by the exhaust section to the storage tank is not less than 150% of the gas in the storage tank. This ensures that the hydrogen in the storage tank can be sufficiently diluted by the air supplied by the exhaust section, guaranteeing that the hydrogen content in the storage tank is below 1%, reducing the risk of storage tank explosion, and improving the safety of storing electrolyzed sodium hypochlorite in the storage tank. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the sodium hypochlorite production system in an embodiment of this utility model. Detailed Implementation

[0014] The following detailed description illustrates the specific implementation methods:

[0015] The reference numerals in the accompanying drawings include: feeding unit 1, softening section 101, water inlet pipe 102, heat exchange section 103, salt dissolving section 104, dilution water pipe 105, brine pipe 106, control valve 107, electrolysis unit 2, dilution tank 201, electrolytic tank 202, storage unit 3, storage tank 301, conveying pipe 302, exhaust section 303, fan 304, air conveying pipe 305, and exhaust pipe 306. (See attached...) Figure 1 As shown, a sodium hypochlorite production system includes a feeding unit 1, an electrolysis unit 2, and a storage unit 3. The feeding unit 1 is used to feed the raw materials required for the electrolysis production of sodium hypochlorite to the electrolysis unit 2. The electrolysis unit 2 is used to electrolyze the raw materials to produce sodium hypochlorite. The storage unit 3 is used to store the sodium hypochlorite produced by the electrolysis unit 2.

[0016] The feeding unit 1 includes a softening section 101, on which a water inlet pipe 102 is connected. The water inlet pipe 102 is used to supply water into the softening section 101, and the softening section 101 is used to soften the water to form softened water. The softening section 101 can be a water softening device. Preferably, in this embodiment, the softening section 101 is a fully automatic water softening device of model JSY-WT-25. The specific details of how the water softens using the water softening device are prior art and will not be described further here.

[0017] The feeding unit 1 also includes a heat exchange section 103 and a salt dissolving section 104, which are connected in parallel on one side of the softening section 101. Specifically, both the heat exchange section 103 and the salt dissolving section 104 are connected to the outlet of the softening section 101 through pipes. The heat exchange section 103 is used to regulate the temperature of the softened water to form dilution water. The heat exchange section 103 can be a heat exchanger or a heater, etc., to regulate the water temperature. Preferably, in this embodiment, a heat exchanger is used to regulate the temperature of the softened water.

[0018] The heat exchange section 103 regulates the temperature of the dilution water within a range of 15℃ to 27℃. Preferably, in this embodiment, the temperature regulation of the dilution water by the heat exchange section 103 is 22℃. This ensures that the temperature of the dilution water is within the suitable temperature range for electrolytic processing, guaranteeing that the dilution water and brine can be directly electrolyzed after mixing. This improves the convenience of electrolytic processing while avoiding setting the dilution water temperature too high, which would increase the energy demand of the heat exchange section 103, increase production costs, and lead to resource waste.

[0019] The salt-dissolving section 104 includes a salt-dissolving tank, which is used to dissolve salt in the softened water after softening in the softening section 101 to obtain brine. The specific structure and contents of the salt-dissolving tank for dissolving salt in softened water are prior art and will not be described further here. The brine formed by the salt-dissolving section 104 is saturated brine. By making the brine saturated, the concentration of the brine can be maintained within a relatively constant range, improving the efficiency of the brine delivery from the salt-dissolving section 104 to the electrolysis section, and facilitating the calculation of the ratio when mixing and diluting the brine with dilution water.

[0020] Electrolysis unit 2 includes a dilution tank 201 and an electrolysis tank 202, which are connected in series. The dilution tank 201 is located on the side of electrolysis unit 2 closer to the feeding unit 1. One end of the dilution tank 201 is provided with a dilution water pipe 105 and a brine pipe 106. One end of the dilution water pipe 105 is connected to the dilution tank 201, and the other end of the dilution water pipe 105 is connected to the heat exchange section 103. The dilution water pipe 105 is used to transport the dilution water after heat exchange in the heat exchange section 103 to the dilution tank 201. One end of the brine pipe 106 is connected to the dilution tank 201, and the other end of the water pipe is connected to the salt dissolving tank. The brine pipe 106 is used to transport the brine in the salt dissolving tank to the dilution tank 201. A regulating valve is provided at one end of the dilution water pipe 105 and the saline solution pipe 106 near the dilution tank 201. The regulating valve is used to regulate the flow rate of dilution water or saline solution supplied to the dilution tank 201 by the dilution water pipe 105 and the saline solution pipe 106. The control valve 107 can be a pipeline flow control valve such as a solenoid valve. The specific details of regulating the flow rate of the dilution water pipe 105 and the saline solution pipe 106 by the control valve 107 are prior art and will not be described in detail here. The dilution tank 201 is used to mix dilution water and saline solution in a certain proportion to obtain a diluted saline solution of a preset concentration. The specific structure of the dilution tank 201 is prior art and will not be described in detail here.

[0021] The inlet of the electrolytic cell 202 is connected to the outlet of the dilution tank 201 via a pipe. The electrolytic cell 202 is used to electrolyze the diluted brine to generate sodium hydroxide. The specific structure of the electrolytic cell 202 is existing technology and will not be described in detail here.

[0022] The storage unit 3 includes a storage tank 301, which has a storage cavity. A conveying pipe 302 is provided between the storage tank 301 and the electrolytic cell 202. One end of the conveying pipe 302 is connected to the output port of the electrolytic cell 202, and the other end of the conveying pipe 302 is connected to the storage cavity of the storage tank 301. The conveying pipe 302 is used to transport the product after electrolysis in the electrolytic cell 202 to the storage tank 301 for storage.

[0023] The storage unit 3 also includes an exhaust section 303, which includes a fan 304. An air supply pipe 305 is provided between the fan 304 and the storage tank 301. One end of the air supply pipe 305 is connected to the top of the storage tank 301, and the other end is connected to the air outlet of the fan 304. The fan 304 is used to supply air into the storage tank 301 through the air supply pipe 305. An exhaust pipe 306 is also provided on the storage tank 301. One end of the exhaust pipe 306 is connected to the storage chamber through the top of the storage tank 301 away from the air supply pipe 305, and the other end extends away from the storage tank 301. The exhaust pipe 306 is used to transport the gas in the storage tank 301 to a tail gas treatment device for processing. This allows the hydrogen and other gaseous byproducts generated from the electrolyzed sodium hypochlorite stored in the storage tank 301 to be discharged in a timely manner through the exhaust section 303, preventing excessive accumulation of hydrogen in the storage tank 301 and increasing the risk of explosion of the storage tank 301.

[0024] The airflow rate supplied by the exhaust section to the storage tank 301 is no less than 150% of the gas inside the storage tank 301. Specifically, the airflow rate supplied by the exhaust section is no less than 150% of the amount of hydrogen generated from the sodium hypochlorite stored in the storage tank 301. The specific calculation of the amount of hydrogen generated based on the capacity of the stored sodium hypochlorite is prior art and will not be elaborated here. This ensures that the hydrogen in the storage tank 301 is sufficiently diluted by the air supplied by the exhaust section, guaranteeing that the hydrogen content in the storage tank 301 is below 1%, reducing the risk of explosion of the storage tank 301, and improving the safety of storing electrolyzed sodium hypochlorite in the storage tank 301.

[0025] The specific implementation process is as follows:

[0026] In the production of sodium hypochlorite, water is softened and then the temperature is adjusted by the heat exchanger 103 to form dilution water. Sodium chloride is dissolved in the salt dissolving section 104 to obtain brine. The dilution water and brine are mixed in proportion in the dilution tank 201 of the electrolysis unit 2 to dilute the sodium chloride concentration in the water to obtain a diluted brine with a certain ratio. The diluted brine is then transported to the electrolysis tank 202 for electrolysis to produce sodium hypochlorite. The electrolyzed product is then transported to the storage unit 3 for storage.

[0027] Compared to existing technologies, this solution, in the production of sodium hypochlorite, involves softening the raw water and then heating and dissolving the salt separately. This allows for adjustment of the ratio of dilution water to brine according to actual needs, ensuring that the concentration of the diluted brine matches the actual requirements during production. This guarantees the efficiency of the electrolytic production of brine and avoids the impact of excessively high or low brine concentrations on the efficiency of sodium hypochlorite electrolysis. Furthermore, by adjusting the temperature of the dilution water, the temperature of the diluted brine is maintained within a preset range during production, preventing the dilution brine from becoming too cold due to external environmental influences, which would affect the efficiency of electrolysis. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A sodium hypochlorite production system characterized by The system includes a feeding unit, an electrolysis unit, and a storage unit. The feeding unit comprises a softening section, a heat exchange section, and a salt dissolving section. The softening section generates softened water. The heat exchange section and the salt dissolving section are connected in parallel on one side of the softening section. The heat exchange section regulates the temperature of the softened water to generate dilution water. The salt dissolving section dissolves salt in the softened water to obtain brine. The electrolysis unit comprises a dilution tank and an electrolytic cell. The dilution tank mixes and dilutes the dilution water with the brine to obtain diluted brine. The electrolytic cell electrolyzes the diluted brine to generate sodium hypochlorite. The storage unit stores the sodium hypochlorite generated by the electrolysis unit.

2. The sodium hypochlorite production system according to claim 1, characterized in that The heat exchange unit can adjust the temperature of the dilution water within a range of 15℃-27℃.

3. The sodium hypochlorite production system according to claim 1, characterized in that The salt solution formed in the salt-dissolving section is a saturated salt solution.

4. The sodium hypochlorite production system according to claim 1, characterized in that The storage unit includes a storage tank for storing sodium hypochlorite generated by the electrolysis unit; the storage unit also includes an exhaust section, which includes a fan connected to the storage tank via a gas supply pipe, and the fan is used to supply air into the storage tank; the storage tank is also provided with an exhaust pipe for discharging the gas inside the storage tank.

5. The sodium hypochlorite production system according to claim 4, characterized in that The air flow rate delivered by the exhaust section to the storage tank is not less than 150% of the gas in the storage tank.

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