Production system for preparing sodium hypochlorite through electrolysis

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a production system for preparing sodium hypochlorite through electrolysis, which comprises a soft water preparation module, a salt dissolving module, a generator module, a storage module, a feeding module and a pickling module, and the soft water preparation module is respectively connected with the salt dissolving module and the generator module. The soft water preparation module provides soft water for the salt dissolving module and the generator module, saline water output by the salt dissolving module and the soft water conveyed to the generator module by the soft water preparation module are mixed into diluted saline water, then the diluted saline water is input into the generator module, and the generator module electrolyzes to generate a sodium hypochlorite solution and inputs the sodium hypochlorite solution into the storage module. The generator module is further connected with an acid pickling module, the acid pickling module is used for inputting acid liquor into the generator module to clean the generator module, excessive scaling of the generator module is avoided, the production efficiency of the generator module is guaranteed, and the overall production efficiency of the production system is also guaranteed and improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field more specifically, relate to a kind of electrolytic preparation sodium hypochlorite production system. BACKGROUND

[0002] In sewage treatment, a large amount of disinfectant is needed to treat sewage. The existing sewage disinfection methods generally include sodium hypochlorite, chlorine dioxide, ultraviolet rays and ozone disinfection, etc. Among them, sodium hypochlorite has the advantages of convenient raw material procurement, high safety, good continuous disinfection effect, etc. In terms of disinfection, sodium hypochlorite solution has obvious advantages. As a highly effective, broad-spectrum and safe powerful disinfectant and virucidal agent, it has excellent affinity with water and can be miscible with water in any ratio. It does not have the safety hazards of liquid chlorine and chlorine dioxide and other agents, and its disinfection effect is considered to be equivalent to that of chlorine gas. It has good disinfection effect, accurate dosing, safe operation, easy use, easy storage, no environmental toxicity, no chlorine leakage risk, and can be dosed in any working environment. For example, in a sewage plant that treats 70,000 tons of water per day, 10% commercial sodium hypochlorite solution is used for MBR membrane cleaning and reclaimed water disinfection, and tail water is discharged by ultraviolet disinfection. The daily consumption of sodium hypochlorite solution is about 3 tons, and the demand is large. However, due to the high decay rate of 10% commercial sodium hypochlorite solution, the product is not pure, and there are certain safety hazards in transportation and storage. In addition, the raw material cost is high, which increases the production cost, and the supply of goods is unstable, which may affect normal production. The existing production system for preparing sodium hypochlorite solution is prone to scaling inside the main working equipment after long-term use, which affects production efficiency. SUMMARY

[0003] The utility model discloses a kind of electrolytic preparation sodium hypochlorite production systems to overcome the scaling inside the main working equipment of the production system for preparing sodium hypochlorite solution in the prior art after long-term use, reduce the scaling inside the main working equipment, ensure production efficiency.

[0004] To solve the above technical problems, the utility model adopts the technical scheme of: a kind of electrolytic preparation sodium hypochlorite production system, comprising: soft water preparation module, salt dissolving module, generator module connected with the salt dissolving module, storage module connected with the generator module, dosing module connected with the storage module, and pickling module connected with the generator. The soft water preparation module is connected with the salt dissolving module and the generator module.

[0005] The soft water preparation module prepares soft water, part of which is delivered to the salt dissolving module to provide water source for the salt dissolving module, and the other part is delivered to the generator module. After the salt dissolving module prepares brine, the brine is also delivered to the generator module. During the process, the brine and the soft water are mixed in a certain proportion to form diluted brine with appropriate concentration, and then the diluted brine enters the generator module. The diluted brine undergoes a series of electrolytic chemical reactions in the generator module to finally prepare sodium hypochlorite solution. The process of preparing sodium hypochlorite by electrolysis can be expressed by a chemical equation:

[0006] NaCl + H2O → NaClO + H2↑;

[0007] Electrode reaction: anode: 2Cl- 2e- → Cl2;

[0008] Cathode: 2H+ 2e- → H2;

[0009] Solution reaction: 2NaOH + Cl2 → NaCl + NaClO + H2O;

[0010] The storage module is used to temporarily store the prepared sodium hypochlorite solution to ensure the reserve amount of sodium hypochlorite solution and to ensure the stable output and supply of sodium hypochlorite solution. The dosing module is used to output the sodium hypochlorite solution to ensure the output and distribution of the sodium hypochlorite solution. The acid washing module is used to clean the electrolytic equipment in the generator module. After working for a period of time, the impurities in the process liquid in the generator module, especially the calcium and magnesium ions that cause hardness, will form scale on the surface of the electrode plate of the electrolytic equipment, reducing the reaction efficiency. The acid washing module uses acid to clean the inside of the electrolytic equipment in the generator module to ensure the stable operation of the equipment and the production efficiency of the system. The acid can dissolve the deposits on the surface of the electrode plate without damaging the electrode. The liquid transportation between the above-mentioned modules includes gravity potential flow or pump transportation.

[0011] Preferably, the soft water preparation module comprises at least two water softeners, a soft water branch pipe, a soft water converging pipe, a first soft water diverging pipe, a second soft water diverging pipe, a soft water storage tank, a soft water delivery pipe and a soft water pump. The water outlet ends of all the water softeners are connected to the soft water converging pipe through the soft water branch pipe. The soft water converging pipe is connected to the first soft water diverging pipe and the second soft water diverging pipe. The first soft water diverging pipe is connected to the water inlet end of the soft water storage tank, and the second soft water diverging pipe is connected to the water inlet end of the salt dissolving module. The soft water delivery pipe is connected to the water outlet end of the soft water storage tank and the water inlet end of the generator module. The soft water pump is arranged on the soft water delivery pipe. Valves are arranged on the soft water branch pipe, the soft water converging pipe, the first soft water diverging pipe, the second soft water diverging pipe and the soft water delivery pipe.

[0012] The softener accesses tap water and performs softening treatment to output soft water. The soft water of each softener flows out from the soft water branch pipes and then flows into the soft water confluence pipe. Then, part of the soft water flows into the soft water storage tank from the first soft water shunt pipe. The water in the soft water storage tank is transported to the generator module under the action of the soft water pump. The other part of the soft water in the soft water confluence pipe enters the second soft water shunt pipe and then flows into the salt dissolving module. The valve is arranged to connect or close each pipe.

[0013] Preferably, the soft water preparation module further comprises an automatic valve arranged on the first soft water shunt pipe, a soft water parallel pipe connected with the first soft water shunt pipe at two ends, and a maintenance valve. The soft water parallel pipe is provided with a valve. The maintenance valve is arranged on the two sides of the automatic valve. The automatic valve and the maintenance valve are connected in parallel with the soft water parallel pipe.

[0014] The automatic valve can be remotely controlled and connected with the salt dissolving module to control the water input according to the demand of the salt dissolving module. The automatic valve can also be manually controlled to facilitate the control of the soft water input into the salt dissolving module. The maintenance valve is arranged on the two sides of the automatic valve to cut off the water flow on the two sides of the automatic valve, facilitating the maintenance and repair of the automatic valve. The soft water parallel pipe is connected in parallel with the automatic valve and the maintenance valve. When the automatic valve needs to be maintained, the maintenance valve is closed, and then the valve on the soft water parallel pipe is opened to ensure the supply of soft water to the salt dissolving module. Further, a sampling valve is connected to each soft water branch pipe to facilitate sampling and observation of the soft water.

[0015] Preferably, the salt dissolving module comprises a salt dissolving tank, a salt feeding device connected with the salt dissolving tank, a salt water supplement pipe and a salt water conveying pipe connected with the water outlet of the salt dissolving tank respectively, and a salt water pump. The salt water supplement pipe is connected with the soft water preparation module. The salt water conveying pipe is connected with the generator module. Valves are arranged on the salt water supplement pipe and the salt water conveying pipe. The salt water pump is arranged on the salt water conveying pipe.

[0016] The salt feeding device is used to feed salt into the salt dissolving tank. Further, the salt feeding device adopts a bucket elevator. The soft water in the soft water preparation module flows into the salt dissolving tank through the second soft water shunt pipe. The prepared salt water is output from the salt water supplement pipe and the salt water conveying pipe. The salt water supplement pipe is connected with the soft water preparation module to supplement the salt in the soft water preparation module. The salt water pump conveys the salt water in the salt water conveying pipe to the generator module.

[0017] Preferably, the salt dissolving module further comprises a first filter arranged on the salt water conveying pipe.

[0018] The first filter is used to filter impurities in the salt water. Further, the first filter adopts a Y-type filter.

[0019] Preferably, the generator module comprises a dilute brine input pipe, a plurality of electrolytic cells arranged vertically in series, a sodium hypochlorite pipe, one end of the dilute brine input pipe is connected with the soft water preparation module and the salt dissolving module respectively, the other end is connected with the water inlet end of the electrolytic cell located at the bottom, one end of the sodium hypochlorite pipe is connected with the water outlet end of the electrolytic cell located at the top, the other end is connected with the storage module, and valves are arranged on the dilute brine input pipe and the sodium hypochlorite pipe respectively.

[0020] The soft water in the soft water preparation module is transported to the dilute brine input pipe through a soft water conveying pipe, and the brine in the salt dissolving module is transported to the dilute brine input pipe through a brine conveying pipe, the soft water and the brine are mixed in the dilute brine input pipe according to a certain proportion to form dilute brine, and then the dilute brine is input into the electrolytic cell located at the bottom, then the dilute brine is allowed to overflow the electrode plates of all the electrolytic cells, then the electrolytic cell starts to work, the dilute brine continues to be input, the electrolytic cell continues to work, and sodium hypochlorite solution is continuously output to the storage module.

[0021] Preferably, the storage module comprises at least two product storage tanks arranged in series, an air inlet pipe and an air outlet pipe connected with the product storage tanks respectively, a fan connected with the air inlet pipe, a product branch pipe connected with the water outlet end of the product storage tank, and a product main pipe, two ends of the product main pipe are connected with the product branch pipe and the dosing module respectively, and a valve is arranged on the product branch pipe.

[0022] The sodium hypochlorite solution in the generator module is input into the product storage tank through the sodium hypochlorite pipe for temporary storage, and the by-product hydrogen generated during electrolysis also enters the product storage tank together with the sodium hypochlorite solution, the top of the product storage tank is connected with the air inlet pipe and the air outlet pipe respectively, and the fan is used to dilute the by-product hydrogen to a safe discharge concentration and then discharge it to the atmosphere through the air outlet pipe.

[0023] Preferably, the dosing module comprises a second filter, a dosing pump, a check valve and a diaphragm valve arranged on the product main pipe in sequence.

[0024] The second filter, the dosing pump, the check valve and the diaphragm valve are arranged on the product main pipe in sequence according to the water flow direction, the second filter is used for filtering impurities, further, the second filter adopts a Y-type filter, the dosing pump is used for outputting the product sodium hypochlorite solution, the check valve is used for preventing the sodium hypochlorite solution from flowing back and also for maintaining a constant pressure at the outlet of the dosing pump, and the diaphragm valve is used for closing the product main pipe.

[0025] Preferably, the acid pickling module comprises an acid pickling tank, a first hydrochloric acid pipe and a second hydrochloric acid pipe connected with the acid pickling tank respectively, and an acid pickling pump arranged on the first hydrochloric acid pipe, the first hydrochloric acid pipe is connected with the generator module, and the second hydrochloric acid pipe is connected with the generator module.

[0026] The first hydrochloric acid pipe is connected with the electrolytic cell at the bottom of the generator module, and the second hydrochloric acid pipe is connected with the electrolytic cell at the top of the generator module, the pickling pump passes the acid liquid into the electrolytic cell through the first hydrochloric acid pipe, the acid liquid flows out from the electrolytic cell at the top after flowing through all the electrolytic cells, and then flows back into the pickling tank through the second hydrochloric acid pipe, when the pickling module works, the dilute brine input pipe and the sodium hypochlorite pipe in the generator module are closed, and the acid liquid cannot flow into the finished product storage tank from the sodium hypochlorite pipe. Further, the electrolytic cell is provided with a set of independent acid liquid circulating pipeline and interface, which can fully avoid the pollution of the dilute brine input pipe and the sodium hypochlorite pipe by the acid liquid.

[0027] Preferably, the pickling module further comprises a quick release joint, the first hydrochloric acid pipe comprises a first pipeline connected with the pickling tank and a second pipeline connected with the water inlet end of the generator module, the second hydrochloric acid pipe comprises a third pipeline connected with the pickling tank and a fourth pipeline connected with the water outlet end of the generator module, and the first pipeline and the second pipeline and the third pipeline and the fourth pipeline are connected through the quick release joint respectively.

[0028] The quick release joint is arranged to facilitate the connection of the pickling module, the second pipeline and the fourth pipeline are arranged on each generator module, the pickling tank, the pickling pump, the first pipeline and the third pipeline are moved, so that multiple generator modules can share one pickling module, and the cost is saved.

[0029] Compared with the prior art, the pickling module has the beneficial effects that:

[0030] 1. The soft water preparation module provides soft water for the salt dissolving module and the generator module, the brine output by the salt dissolving module is mixed with the soft water delivered by the soft water preparation module to the generator module to form dilute brine, and then the dilute brine is input into the generator module, the generator module electrolyzes to generate sodium hypochlorite solution and inputs the sodium hypochlorite solution into the storage module, and then the dosing module outputs the sodium hypochlorite solution for use, the generator module is further connected with the pickling module, the pickling module is used for inputting acid liquid into the generator module to clean the generator module, so that the generator module is prevented from being excessively scaled, the production efficiency of the generator module is ensured, and the overall production efficiency of the production system is ensured and improved.

[0031] 2. The pickling module is provided with a quick release joint, so that when cleaning is needed, the pickling module can be moved to clean multiple generator modules in sequence, and the equipment cost and the cleaning cost are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a whole system schematic diagram of the electrolytic sodium hypochlorite production system of the utility model;

[0033] Figure 2It is a soft water preparation module and salt dissolving module system schematic diagram of the electrolytic sodium hypochlorite production system of the utility model;

[0034] Figure 3 It is a generator module, storage module and adding module system schematic diagram of the electrolytic sodium hypochlorite production system of the utility model;

[0035] Figure 4 It is an acid washing module system schematic diagram of the electrolytic sodium hypochlorite production system of the utility model;

[0036] Figure 5 It is an overall structure schematic diagram of the electrolytic sodium hypochlorite production system of the utility model;

[0037] Figure 6 It is an overall structure top view schematic diagram of the electrolytic sodium hypochlorite production system of the utility model.

[0038] In the drawing,

[0039] 1, soft water preparation module;101, soft water tank;102, soft water branch pipe;103, soft water confluence pipe;104, first soft water shunt pipe;105, second soft water shunt pipe;106, soft water storage tank;107, soft water conveying pipe;108, soft water pump;109, automatic valve;110, soft water parallel pipe;111, maintenance valve;

[0040] 2, salt dissolving module;201, salt dissolving tank;202, salt throwing equipment;203, salt water supplement pipe;204, salt water conveying pipe;205, salt water pump;206, first filter;

[0041] 3, generator module;301, dilute salt water input pipe;302, electrolytic cell;303, sodium hypochlorite pipe;

[0042] 4, storage module;401, finished product storage tank;402, air inlet pipe;403, exhaust pipe;404, fan;405, finished product branch pipe;406, finished product main pipe;

[0043] 5, adding module;501, second filter;502, adding pump;503, check valve;504, diaphragm valve;

[0044] 6, acid washing module;601, acid washing box;602, first hydrochloric acid pipe;6021, first pipe;6022, second pipe;603, second hydrochloric acid pipe;6031, third pipe;6032, fourth pipe;604, acid washing pump;605, quick release joint;

[0045] 7, tap water pipe;8, sewage pipe. DETAILED DESCRIPTION

[0046] The accompanying drawings are only used for illustrative description and cannot be understood as limitation to the patent; in order to better illustrate the embodiments, some components in the drawings can be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable for those skilled in the art that some well-known structures and their descriptions in the drawings can be omitted. The positional relationship described in the drawings is only used for illustrative description and cannot be understood as limitation to the patent.

[0047] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "long" and "short" is based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, a particular orientation and operation, therefore the terms describing the positional relationship in the drawings are only used for illustrative description and cannot be understood as limitation to the patent, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0048] The technical scheme of the utility model will be further concretely described below through specific embodiments and in conjunction with the drawings:

[0049] Embodiment 1

[0050] As shown in the drawing, Figure 1 A production system for electrolytic preparation of sodium hypochlorite comprises: a soft water preparation module 1, a salt dissolving module 2, a generator module 3 connected with the salt dissolving module 2, a storage module 4 connected with the generator module 3, a dosing module 5 connected with the storage module 4, and an acid washing module 6 connected with the generator, and the soft water preparation module 1 is connected with the salt dissolving module 2 and the generator module 3 respectively.

[0051] The soft water preparation module 1 prepares soft water, part of which is transported to the salt dissolving module 2 to provide water source for the salt dissolving module 2, and the other part is transported to the generator module 3; after the salt dissolving module 2 prepares brine, the brine is also transported to the generator module 3; during the process, the brine and the soft water are mixed in a certain proportion to form diluted brine with appropriate concentration, and then the diluted brine enters the generator module 3; the diluted brine undergoes a series of electrolytic chemical reactions in the generator module 3 to finally prepare sodium hypochlorite solution, and the generation process of sodium hypochlorite can be expressed by a chemical equation:

[0052] NaCl + H2O → NaClO + H2↑;

[0053] Electrode reaction: anode: 2Cl- 2e- → Cl2;

[0054] Cathode: 2H++2e→H2;

[0055] Solution reaction: 2NaOH+Cl2→NaCl+NaClO+H2O;

[0056] The storage module 4 is used for temporarily storing the prepared sodium hypochlorite solution, so as to ensure the storage amount of the sodium hypochlorite solution and the stable output and supply of the sodium hypochlorite solution; the dosing module 5 is used for outputting the sodium hypochlorite solution, so as to ensure the output and distribution of the sodium hypochlorite solution; and the pickling module 6 is used for pickling and cleaning the electrolytic equipment in the generator module 3. After working for a period of time, the impurities in the process liquid in the generator module 3, especially the calcium and magnesium ions of manufacturing hardness, will scale on the surface of the electrode plate of the electrolytic equipment, thereby reducing the reaction efficiency. The pickling module 6 uses acid liquid to clean the inside of the electrolytic equipment of the generator module 3, so as to ensure the stable operation of the equipment and the production efficiency of the system; the acid liquid can dissolve the deposits on the surface of the electrode plate, but will not damage the electrode. The liquid transportation between the above modules includes gravity potential flow or pump transportation.

[0057] Advantages of the embodiment: The soft water preparation module 1 provides soft water for the salt dissolving module 2 and the generator module 3 respectively. The brine output by the salt dissolving module 2 is mixed with the soft water transported by the soft water preparation module 1 to the generator module 3 to form diluted brine, and then is input into the generator module 3. The generator module 3 electrolyzes to generate sodium hypochlorite solution and inputs the sodium hypochlorite solution into the storage module 4. Then, the dosing module 5 outputs and uses the sodium hypochlorite solution. The generator module 3 is also connected with the pickling module 6. The pickling module 6 is used for inputting acid liquid into the generator module 3 to clean the generator module 3, so as to avoid excessive scaling of the generator module 3, ensure the production efficiency of the generator module 3, and ensure and improve the overall production efficiency of the production system.

[0058] Example 2

[0059] On the basis of example 1, the difference from example 1 is that:

[0060] As Figure 2As shown, the soft water preparation module 1 comprises at least two soft water devices 101, soft water branch pipes 102, a soft water converging pipe 103, a first soft water diverging pipe 104, a second soft water diverging pipe 105, a soft water storage tank 106, a soft water delivery pipe 107, and a soft water pump 108. The water outlet ends of all the soft water devices 101 are respectively connected to the soft water converging pipe 103 through the soft water branch pipes 102, the soft water converging pipe 103 is connected to the first soft water diverging pipe 104 and the second soft water diverging pipe 105, the first soft water diverging pipe 104 is connected to the water inlet end of the soft water storage tank 106, the second soft water diverging pipe 105 is connected to the water inlet end of the salt dissolving module 2, the soft water delivery pipe 107 is connected to the water outlet end of the soft water storage tank 106 and the water inlet end of the generator module 3, and the soft water pump 108 is arranged on the soft water delivery pipe 107. Valves are respectively arranged on the soft water branch pipes 102, the soft water converging pipe 103, the first soft water diverging pipe 104, the second soft water diverging pipe 105, and the soft water delivery pipe 107. The soft water preparation module 1 further comprises an automatic valve 109 arranged on the first soft water diverging pipe 104, a soft water parallel pipe 110 connected to the first soft water diverging pipe 104 at both ends, and a maintenance valve 111. Valves are arranged on the soft water parallel pipe 110, and maintenance valves 111 are arranged on both sides of the automatic valve 109. The automatic valve 109 and the maintenance valves 111 are connected in parallel to the soft water parallel pipe 110. The salt dissolving module 2 comprises a salt dissolving tank 201, a salt throwing device 202 connected to the salt dissolving tank 201, a salt water supplement pipe 203 and a salt water delivery pipe 204 connected to the water outlet end of the salt dissolving tank 201, and a salt water pump 205. The salt water supplement pipe 203 is connected to the soft water preparation module 1, the salt water delivery pipe 204 is connected to the generator module 3, and valves are arranged on the salt water supplement pipe 203 and the salt water delivery pipe 204. The salt water pump 205 is arranged on the salt water delivery pipe 204. The salt dissolving module 2 further comprises a first filter 206 arranged on the salt water delivery pipe 204.

[0061] The softener 101 accesses tap water and outputs softened water after softening treatment. The softened water of each softener 101 flows out from the soft water branch pipe 102 and then flows into the soft water confluence pipe 103. Then, part of the softened water flows into the soft water storage tank 106 from the first soft water branch pipe 104, and the water in the soft water storage tank 106 is transported to the generator module 3 under the action of the soft water pump 108. The other part of the softened water in the soft water confluence pipe 103 flows into the second soft water branch pipe 105 and then flows into the salt dissolving module 2. The valve is arranged to connect or close the pipes. The automatic valve 109 can be remotely controlled and can be connected with the salt dissolving module 2 to control the water inflow according to the demand of the salt dissolving module 2. The automatic valve 109 can also be manually controlled to facilitate the control of the amount of softened water input into the salt dissolving module 2. The maintenance valves 111 are arranged on the two sides of the automatic valve 109 to cut off the water flow on the two sides of the automatic valve 109, facilitating the maintenance and repair of the automatic valve 109. The soft water parallel pipe 110 is connected with the automatic valve 109 and the maintenance valves 111 in parallel. When the automatic valve 109 needs to be maintained, the maintenance valves 111 are closed, and then the valve on the soft water parallel pipe 110 is opened to ensure the supply of softened water to the salt dissolving module 2. Further, a sampling valve is connected to each soft water branch pipe 102 to facilitate sampling and observation of the softened water. The salt feeding device 202 is used to feed salt into the salt dissolving tank 201. Further, the salt feeding device 202 adopts a bucket elevator, and the softened water in the softened water preparation module 1 flows into the salt dissolving tank 201 through the second soft water branch pipe 105. The prepared brine is output from the brine supplement pipe 203 and the brine conveying pipe 204. The brine supplement pipe 203 is connected with the softened water preparation module 1 to supplement the salt content of the softened water preparation module 1. The brine pump 205 conveys the brine in the brine conveying pipe 204 to the generator module 3. The first filter 206 is used to filter impurities in the brine. Further, the first filter 206 adopts a Y-type filter.

[0062] The remaining features and working principles of this embodiment are consistent with those of embodiment 1.

[0063] Embodiment 3

[0064] On the basis of embodiment 1 or embodiment 2, embodiment 1 or embodiment 2 is further limited, and the difference lies in that:

[0065] For example, Figures 3-4As shown, the generator module 3 comprises a diluted brine input pipe 301, a plurality of electrolytic cells 302 arranged in vertical series, a sodium hypochlorite pipe 303, one end of the diluted brine input pipe 301 is connected with the soft water preparation module 1 and the salt dissolving module 2 respectively, and the other end is connected with the water inlet end of the electrolytic cell 302 located at the bottom, one end of the sodium hypochlorite pipe 303 is connected with the water outlet end of the electrolytic cell 302 located at the top, and the other end is connected with the storage module 4, and valves are respectively arranged on the diluted brine input pipe 301 and the sodium hypochlorite pipe 303. The storage module 4 comprises at least two product storage tanks 401 arranged in series, a gas inlet pipe 402 and a gas outlet pipe 403 connected with the product storage tanks 401 respectively, a fan 404 connected with the gas inlet pipe 402, a product branch pipe 405 connected with the water outlet end of the product storage tanks 401, a product main pipe 406, and the product main pipe 406 is connected with the product branch pipe 405 and the dosing module 5 at both ends respectively, and a valve is arranged on the product branch pipe 405. The dosing module 5 comprises a second filter 501, a dosing pump 502, a check valve 503 and a diaphragm valve 504 arranged in sequence on the product main pipe 406. The pickling module 6 comprises a pickling tank 601, a first hydrochloric acid pipe 602 and a second hydrochloric acid pipe 603 connected with the pickling tank 601 respectively, and a pickling pump 604 arranged on the first hydrochloric acid pipe 602, the first hydrochloric acid pipe 602 is connected with the generator module 3, and the second hydrochloric acid pipe 603 is connected with the generator module 3. The pickling module 6 further comprises a quick release joint 605, the first hydrochloric acid pipe 602 comprises a first pipe 6021 connected with the pickling tank 601 and a second pipe 6022 connected with the water inlet end of the generator module 3, the second hydrochloric acid pipe 603 comprises a third pipe 6031 connected with the pickling tank 601 and a fourth pipe 6032 connected with the water outlet end of the generator module 3, and the first pipe 6021 and the second pipe 6022 and the third pipe 6031 and the fourth pipe 6032 are respectively connected through the quick release joint 605.

[0066] The soft water in the soft water preparation module 1 is delivered to the dilute brine input pipe 301 through the soft water delivery pipe 107, the brine in the salt dissolving module 2 is delivered to the dilute brine input pipe 301 through the brine delivery pipe 204, the soft water and the brine are mixed in the dilute brine input pipe 301 according to a certain proportion to form the dilute brine, and then the dilute brine is input into the electrolytic cell 302 located at the bottom, then the dilute brine is allowed to cover all the electrode plates of the electrolytic cell 302, then the electrolytic cell 302 starts to work, the dilute brine is continuously input, the electrolytic cell 302 continuously works, and the sodium hypochlorite solution is continuously output to the storage module 4. The sodium hypochlorite solution in the generator module 3 is input into the finished product storage tank 401 through the sodium hypochlorite pipe 303 for temporary storage, and the by-product hydrogen gas during electrolysis also enters the finished product storage tank 401 together with the sodium hypochlorite solution, the top of the finished product storage tank 401 is respectively connected with an air inlet pipe 402 and an exhaust pipe 403, and the by-product hydrogen gas is diluted to a safe discharge concentration by the fan 404 and then discharged to the atmosphere through the exhaust pipe 403. The second filter 501, the dosing pump 502, the check valve 503 and the diaphragm valve 504 are sequentially arranged on the finished product main pipe 406 according to the water flow direction, the second filter 501 is used for filtering impurities, further, the second filter 501 adopts a Y-type filter, the dosing pump 502 is used for outputting the finished product sodium hypochlorite solution, the check valve 503 is used for preventing the sodium hypochlorite solution from flowing back and also for maintaining a constant pressure at the outlet of the dosing pump 502, and the diaphragm valve 504 is used for closing the finished product main pipe 406. The first hydrochloric acid pipe 602 is connected with the electrolytic cell 302 located at the bottom in the generator module 3, the second hydrochloric acid pipe 603 is connected with the electrolytic cell 302 located at the top in the generator module 3, and the pickling pump 604 passes the acid liquid into the electrolytic cell 302 through the first hydrochloric acid pipe 602, the acid liquid flows through all the electrolytic cells 302 and then flows out from the electrolytic cell 302 at the top, flows back into the pickling tank 601 through the second hydrochloric acid pipe 603, when the pickling module 6 works, the dilute brine input pipe 301 and the sodium hypochlorite pipe 303 in the generator module 3 are closed, and the acid liquid cannot flow into the finished product storage tank 401 from the sodium hypochlorite pipe 303. Further, the electrolytic cell 302 is provided with a set of independent acid liquid circulating pipes and interfaces, which fully avoids the pollution of the acid liquid to the dilute brine input pipe 301 and the sodium hypochlorite pipe 303. The quick release joint 605 is arranged for facilitating the connection of the pickling module 6, the second pipe 6022 and the fourth pipe 6032 are arranged on each generator module 3, which facilitates the movement of the pickling tank 601, the pickling pump 604, the first pipe 6021 and the third pipe 6031, so that multiple generator modules 3 can share one pickling module 6, thereby saving costs.

[0067] Further, as shown in Figures 1-6 the present example, liquid level transmitters, liquid level limit switches, flow meters, conductivity meters, temperature sensors, differential pressure switches, hydrogen gas detectors, dampers, sewage ditches, flow meters, flow sensors and the like are respectively arranged in the system to meet the actual production requirements and make the system run more stably.Figures 1-6 The diagrams of each component are shown in the table below.

[0068]

[0069] Furthermore, such as Figures 2-3 As shown, in this example, a tap water pipe 7 is provided to supply water to the water softener 101 and to dissipate heat from the electrolytic cell 302; a sewage pipe 8 is also provided to discharge sewage or solutions that do not meet production standards from each pipe.

[0070] The remaining working principles and processes of this embodiment are the same as those of Embodiment 1 or Embodiment 2.

[0071] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0072] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A system for the production of sodium hypochlorite by electrolysis, characterized in that it comprises: The application relates to a soft water preparation module (1), a salt dissolving module (2), a generator module (3) connected with the salt dissolving module (2), a storage module (4) connected with the generator module (3), a dosing module (5) connected with the storage module (4), and an acid washing module (6) connected with the generator. The soft water preparation module (1) comprises at least two soft water devices (101), a soft water branch pipe (102), a soft water confluence pipe (103), a first soft water shunt pipe (104), a second soft water shunt pipe (105), a soft water storage tank (106), a soft water conveying pipe (107), and a soft water pump (108).

2. The system for producing sodium hypochlorite by electrolysis according to claim 1, characterized in that: The water outlet ends of all the soft water devices (101) are connected with the soft water confluence pipe (103) through the soft water branch pipe (102), the soft water confluence pipe (103) is connected with the first soft water shunt pipe (104) and the second soft water shunt pipe (105) at the same time, the first soft water shunt pipe (104) is connected with the water inlet end of the soft water storage tank (106), the second soft water shunt pipe (105) is connected with the water inlet end of the salt dissolving module (2), the two ends of the soft water conveying pipe (107) are connected with the water outlet end of the soft water storage tank (106) and the water inlet end of the generator module (3) respectively, and the soft water pump (108) is arranged on the soft water conveying pipe (107); valves are arranged on the soft water branch pipe (102), the soft water confluence pipe (103), the first soft water shunt pipe (104), the second soft water shunt pipe (105) and the soft water conveying pipe (107) respectively. The soft water preparation module (1) further comprises an automatic valve (109) arranged on the first soft water shunt pipe (104), a soft water parallel pipe (110) connected with the first soft water shunt pipe (104) at two ends, and a maintenance valve (111), a valve is arranged on the soft water parallel pipe (110), the maintenance valves (111) are arranged on the two sides of the automatic valve (109) respectively, and the automatic valve (109) and the maintenance valve (111) are connected with the soft water parallel pipe (110) in parallel.

3. The system for producing sodium hypochlorite by electrolysis according to claim 2, characterized in that: The salt dissolving module (2) comprises a salt dissolving tank (201), a salt feeding device (202) connected with the salt dissolving tank (201), a salt water supplement pipe (203) and a salt water conveying pipe (204) connected with the water outlet end of the salt dissolving tank (201) respectively, and a salt water pump (205), the salt water supplement pipe (203) is connected with the soft water preparation module (1), the salt water conveying pipe (204) is connected with the generator module (3), valves are arranged on the salt water supplement pipe (203) and the salt water conveying pipe (204), and the salt water pump (205) is arranged on the salt water conveying pipe (204).

4. The system for producing sodium hypochlorite by electrolysis according to claim 1, characterized in that: The salt dissolving module (2) further comprises a first filter (206) arranged on the salt water conveying pipe (204).

5. The system for producing sodium hypochlorite by electrolysis according to claim 4, characterized in that: ​ 6. The system for producing sodium hypochlorite by electrolysis according to claim 1, characterized in that: The generator module (3) comprises a diluted brine input pipe (301), a plurality of electrolytic cells (302) arranged in vertical series, a sodium hypochlorite pipe (303), one end of the diluted brine input pipe (301) is connected with the soft water preparation module (1) and the salt dissolving module (2) respectively, the other end is connected with the water inlet end of the electrolytic cell (302) located at the bottom, one end of the sodium hypochlorite pipe (303) is connected with the water outlet end of the electrolytic cell (302) located at the top, the other end is connected with the storage module (4), and valves are respectively arranged on the diluted brine input pipe (301) and the sodium hypochlorite pipe (303).

7. The system for producing sodium hypochlorite by electrolysis according to claim 1, characterized in that: The storage module (4) comprises at least two product storage tanks (401) arranged in series, an air inlet pipe (402) and an air outlet pipe (403) connected with the product storage tanks (401) respectively, a fan (404) connected with the air inlet pipe (402), a product branch pipe (405) connected with the water outlet end of the product storage tank (401), and a product main pipe (406), both ends of the product main pipe (406) are connected with the product branch pipe (405) and the dosing module (5) respectively, and a valve is arranged on the product branch pipe (405).

8. The system for producing sodium hypochlorite by electrolysis according to claim 7, characterized in that: The dosing module (5) comprises a second filter (501), a dosing pump (502), a check valve (503) and a diaphragm valve (504) arranged in sequence on the product main pipe (406).

9. The system for producing sodium hypochlorite by electrolysis according to claim 1, characterized in that: The acid washing module (6) comprises an acid washing tank (601), a first hydrochloric acid pipe (602) and a second hydrochloric acid pipe (603) connected with the acid washing tank (601) respectively, and an acid washing pump (604) arranged on the first hydrochloric acid pipe (602), the first hydrochloric acid pipe (602) is connected with the generator module (3), and the second hydrochloric acid pipe (603) is connected with the generator module (3).

10. The system for producing sodium hypochlorite by electrolysis according to claim 9, characterized in that: The acid washing module (6) further comprises a quick release joint (605), the first hydrochloric acid pipe (602) comprises a first pipe (6021) connected with the acid washing tank (601) and a second pipe (6022) connected with the water inlet end of the generator module (3), the second hydrochloric acid pipe (603) comprises a third pipe (6031) connected with the acid washing tank (601) and a fourth pipe (6032) connected with the water outlet end of the generator module (3), and the first pipe (6021) and the second pipe (6022) and the third pipe (6031) and the fourth pipe (6032) are connected through the quick release joint (605) respectively.

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