Intelligent electrolytic chlorine production and multi-element efficient absorption system

Abstract

The invention discloses an intelligent electrolytic chlorine production and multi-element efficient absorption system, and relates to the technical field of electrolytic chlorine production processes. Comprising a domestic water input module, a water softening module, a water washing module, a salt dissolving module, an electrolysis module, an anode circulation module, a cathode circulation module, a dechlorination module, an absorption module, an alkali liquor circulation output module and a product storage module, all the modules form an interconnected and intercommunicated material conveying network through pipelines and control valves, material conveying automation is controlled by an electric control operation table, and a continuous closed-loop production process is formed. The double water softeners supply water collaboratively, and the alkali dissolving tanks operate collaboratively, so that stable starting and continuous operation of the system can be guaranteed; dechlorination and alkali liquor adjustment are linked, and a whole-process material closed loop is combined, so that the resource utilization rate is remarkably increased, and water resources and raw materials are saved; the concentration of alkali liquor and the flow direction of materials are accurately controlled, the stability of electrolytic reaction is improved, the purity of sodium hypochlorite products is guaranteed, meanwhile, chlorine leakage is avoided, and high efficiency, economical efficiency and environment friendliness are achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electrolytic chlorine production, in particular to an intelligent electrolytic chlorine production and multi-element efficient absorption system. BACKGROUND

[0002] The electrolytic chlorine production technology is widely used in water treatment, disinfection and sterilization and the like due to clean products and convenient operation, and the core thereof is to generate sodium hypochlorite by electrolyzing salt water to meet the requirements of multiple scenes. However, the existing system has many technical shortcomings, which restricts the improvement of application benefits.

[0003] In terms of system operation stability, the traditional system is designed with a single soft water device and a single alkali dissolving tank, the soft water supply is not divided into salt dissolving and cleaning / water supplementing requirements, and the alkali storage and supplementing lack a cooperative mechanism, so that the reaction conditions are unstable at the first start, the shutdown and restart process is complicated, and it is difficult to realize continuous and stable operation.

[0004] In terms of structure and space utilization, the existing water washing module has a single function and can only complete electrode cleaning, and a water supplementing module needs to be additionally added to adjust the concentration of the cathode circulating liquid, so that the system structure is complex, the land occupation area is large, and the equipment investment and operation and maintenance costs are increased.

[0005] In terms of resource utilization and environmental protection, the existing system does not form a complete material closed loop, the recovery and utilization rate of the dilute salt water is low, and the chlorine gas is not completely removed, which not only causes waste of water resources and raw materials, but also has the risk of chlorine gas leakage; meanwhile, the alkali concentration control precision is insufficient, which affects the electrolysis reaction stability and the purity of the sodium hypochlorite product, and does not meet the development trend of high efficiency and environmental protection.

[0006] Therefore, the application is improved, and an intelligent electrolytic chlorine production and multi-element efficient absorption system is provided. SUMMARY

[0007] In view of the problems of poor operation stability, complex structure, low resource utilization rate and insufficient environmental protection in the prior art, the application provides an intelligent electrolytic chlorine production and multi-element efficient absorption system, which realizes cooperative water supply through double soft water devices, cooperative storage through double alkali dissolving tanks, function integration of the water washing module, linkage of dechlorination-alkali adjustment, and complete process material closed loop design, solves the problems of resource waste caused by unflowed soft water supply, complicated start and restart and unstable reaction conditions caused by single alkali dissolving tank, structural redundancy caused by separation of the water washing module and the water supplementing module, incomplete chlorine removal and waste and environmental protection risk caused by open material circulation, and solves the problem of insufficient alkali concentration control precision affecting the product purity, and realizes the multiple goals of efficient and stable system operation, resource recycling and environmental protection.

[0008] In order to achieve the above object, the present application is realized by the following technical scheme: an intelligent electrolytic chlorine production and multi-element efficient absorption system, comprising a domestic water input module, a soft water module, a water washing module, a salt dissolving module, an electrolysis module, an anode circulation module, a cathode circulation module, a dechlorination module, an absorption module, an alkali liquor circulation output module and a product storage module;

[0009] Each of the modules forms a material conveying network interconnected by pipelines and control valves, and the material conveying automation is controlled by an electric control operation table to constitute a continuous closed-loop production process.

[0010] One end of the domestic water input module supplies raw water to the soft water module to prepare soft water, and the other end is connected to the alkali liquor circulation output module to adjust the concentration of alkali solution.

[0011] The soft water module supplies low-hardness dissolved water to the salt dissolving module, and also supplies soft water for cleaning and water replenishment to the water washing module.

[0012] The salt dissolving module mixes and dissolves industrial salt and soft water into brine, which is conveyed to the electrolysis module.

[0013] The electrolysis module forms independent circulation loops with the anode circulation module and the cathode circulation module, respectively, and electrolysis brine generates chlorine, dilute brine, hydrogen and sodium hydroxide solution, wherein the chlorine and the dilute brine are introduced into the anode circulation module, and the hydrogen and the sodium hydroxide solution are introduced into the cathode circulation module.

[0014] The anode circulation module divides the chlorine into the absorption module and divides the dilute brine into the dechlorination module, and the chlorine generated by the dechlorination of the dechlorination module is introduced into the absorption module synchronously.

[0015] The cathode circulation module conveys the sodium hydroxide solution to the alkali liquor circulation output module, and the hydrogen is diluted by a fan and discharged.

[0016] The alkali liquor circulation output module supplies the sodium hydroxide solution to the absorption module to participate in the synthesis of sodium hypochlorite, and also supplies the sodium hydroxide solution to the dechlorination module to react with the trace chlorine in the dilute brine after dechlorination to generate sodium hypochlorite to prevent chlorine from volatilizing.

[0017] The dechlorination module returns the dilute brine after dechlorination to the salt dissolving module for reuse.

[0018] The absorption module conveys the synthesized sodium hypochlorite product to the product storage module for storage.

[0019] As a preferred scheme, the soft water module comprises a soft water device A and a soft water device B arranged in parallel.

[0020] The water input module is connected with the water inlets of the water softener A and the water softener B through a branch pipeline, and the water outlets of the water softener A and the water softener B are connected with the salt dissolving module and the water washing module respectively through a joint pipeline.

[0021] The alkali solution circulation output module is connected with the branch pipeline of the water input module through a connecting pipeline.

[0022] As a preferred solution, the salt dissolving module comprises a salt dissolving tank and a circulation pipeline.

[0023] The two ends of the circulation pipeline are respectively connected with the two sides of the bottom of the salt dissolving tank, so as to form a forced circulation dissolving loop of brine.

[0024] One end of the circulation pipeline is connected with the feed inlet of the electrolysis module through a conveying pipeline, and the other end is connected with the discharge outlet of the dechlorination module through a reflux pipeline.

[0025] Industrial salt is filled in the salt dissolving tank, and the soft water and the industrial salt are mixed in the salt dissolving tank, and after being circulated and dissolved through the circulation pipeline, the concentrated brine is conveyed to the electrolysis module.

[0026] As a preferred solution, the electrolysis module is an ion diaphragm type sodium hypochlorite generator, the anode circulation module is an anode circulation tank, the cathode circulation module is a cathode circulation tank, the dechlorination module is a physical dechlorination type dechlorination tower, the absorption module is an absorption tower, and the product storage module is a product storage tank.

[0027] The dilute brine is circulated and enriched in the anode circulation tank, and the sodium hydroxide solution is stably concentrated in the cathode circulation tank; when the dilute brine and the sodium hydroxide solution reach the preset liquid level respectively, the dilute brine flows into the dechlorination tower, and the sodium hydroxide solution flows into the alkali solution circulation output module.

[0028] As a preferred solution, the dechlorination module is any one of an air stripping type dechlorination tower, a vacuum dechlorination type dechlorination tower or a heating dechlorination type dechlorination tower.

[0029] As a preferred solution, the alkali solution circulation output module comprises a caustic soda dissolving tank A and a caustic soda dissolving tank B.

[0030] The caustic soda dissolving tank A and the cathode circulation module form a closed loop through a pipeline, the caustic soda dissolving tank B is connected with the connecting pipeline through a pipeline, and the bottoms of the caustic soda dissolving tank A and the caustic soda dissolving tank B are connected through a pipeline with a valve to realize material conveying.

[0031] The discharge outlets of the caustic soda dissolving tank B are respectively connected with the feed inlets of the absorption module and the dechlorination module.

[0032] The alkali dissolving tank A contains a premixed alkali solution with a preset concentration of 20% to 30%. When the system is first started, the premixed alkali solution is pumped into the cathode circulation module. During normal operation, the sodium hydroxide solution output from the cathode circulation module flows into the alkali dissolving tank A, and then into the alkali dissolving tank B. Domestic water is transported through connecting pipelines to adjust the alkali concentration in the alkali dissolving tank B to 10% to 15%.

[0033] When the system is shut down for maintenance, close the pipe in the connecting pipeline from domestic water to the alkali dissolving tank B. After the sodium hydroxide solution in the alkali dissolving tank B has drained, close the connecting pipeline between the alkali dissolving tank A and the alkali dissolving tank B. Inject sodium hydroxide solution from the cathode circulation module into the alkali dissolving tank A to ensure the initial reaction conditions for the next startup.

[0034] As a preferred embodiment, the water washing module includes a high water level tank, a cathode water washing pipe, an anode water washing pipe, and an alkaline solution replenishment pipe;

[0035] The confluence pipe of the soft water module is connected in parallel with the inlet of the high water level tank, the inlet of the cathode water washing pipe, and the inlet of the anode water washing pipe.

[0036] The outlet end of the cathode water washing pipe is located close to the cathode of the electrolysis module, and the outlet end of the anode water washing pipe is located close to the anode of the electrolysis module.

[0037] One end of the alkali solution replenishment pipe is connected to the bottom of the high water level tank, and the other end is connected to the replenishment port of the cathode circulation module.

[0038] When the system is working, the combined soft water from the soft water module fills the high water level tank. When the concentration of sodium hydroxide solution in the cathode circulation module is too high, the high water level tank delivers soft water through the alkali replenishment pipe to adjust the concentration. When the system is shut down for maintenance, soft water is injected into the cathode water washing pipe and anode water washing pipe through the high water level tank to clean the cathode and anode of the electrolysis module.

[0039] A smart electrolytic chlorine production and multi-element high-efficiency absorption system includes a domestic water input module, a soft water module, a water washing module, a salt dissolving module, an electrolysis module, an anode circulation module, a cathode circulation module, a dechlorination module, an absorption module, an alkali solution circulation output module, and a product storage module, and also includes a newly added alkali solution storage module;

[0040] The alkaline solution storage module is an alkaline solution storage tank;

[0041] In the alkali solution circulation output module, the connecting pipes at the bottom of the alkali dissolving tank A and the alkali dissolving tank B are closed by a valve;

[0042] The outlet of the alkali dissolving tank A is divided into two paths: one path is connected to the alkali inlet of the dechlorination module, and the other path is connected to the alkali storage tank.

[0043] The inlet of the alkali dissolving tank B is connected to the combined pipe of the soft water module via an independent pipe.

[0044] As a preferred embodiment, the alkali dissolving tank A and the cathode circulation module form a closed loop through a pipeline;

[0045] When the system is running normally, the sodium hydroxide solution output from the cathode circulation module flows into the alkali dissolving tank A. When the sodium hydroxide solution in the alkali dissolving tank A reaches the full level, it is delivered to the alkali storage tank and the dechlorination module by the flow distribution device according to the preset ratio. The alkali delivered to the dechlorination module is used to react with the trace amount of chlorine in the brine.

[0046] As a preferred embodiment, the outlet of the alkali dissolving tank B is connected to the inlet of the absorption module;

[0047] The soft water from the combined soft water module is injected into the alkali dissolving tank B, and then flows into the absorption module to react with chlorine to generate a mixed solution of hypochlorous acid and hydrochloric acid. The mixed solution is then transported to the product storage module.

[0048] The mixed solution after the dechlorination module reaction is returned to the salt dissolving tank of the salt dissolving module for reuse.

[0049] The present invention has the following beneficial effects:

[0050] The coordinated water supply from dual water softeners and the coordinated operation of dual alkali dissolving tanks ensure stable system startup and continuous operation.

[0051] The water washing module integrates cleaning and water replenishment functions, simplifying the structure and reducing the footprint;

[0052] The dechlorination and alkali adjustment are linked, and combined with the closed-loop material flow throughout the entire process, the resource utilization rate is significantly improved, and water resources and raw materials are saved.

[0053] Precise control of alkali concentration and material flow improves the stability of electrolysis reaction, ensures the purity of sodium hypochlorite product, and avoids chlorine leakage, combining high efficiency, economy and environmental protection.

[0054] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the workflow of Embodiment 1 of the present invention;

[0056] Figure 2 This is a schematic diagram illustrating the specific structure and workflow of the water softening module and salt dissolving module according to Embodiment 1 of the present invention;

[0057] Figure 3 This is a schematic diagram illustrating the specific structure and workflow of the alkali solution circulation output module in Embodiment 1 of the present invention;

[0058] Figure 4 This is a schematic diagram illustrating the specific structure and workflow of the water washing module in Embodiment 1 of the present invention;

[0059] Figure 5 This is a schematic diagram illustrating the specific structure and workflow of the alkali solution circulation output module in Embodiment 2 of the present invention;

[0060] In the diagram, 1. Water softener A; 2. Water softener B; 3. Salt dissolving tank; 4. Circulation pipeline; 5. Connecting pipeline; 6. Alkali dissolving tank A; 7. Alkali dissolving tank B; 8. High water level tank; 9. Cathode water washing pipe; 10. Anode water washing pipe; 11. Alkali solution replenishment pipe. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0063] Please refer to Example 1 Figures 1 to 4 This invention provides an intelligent electrolytic chlorine production and multi-element high-efficiency absorption system, comprising a domestic water input module, a soft water module, a washing module, a salt dissolving module, an electrolysis module, an anode circulation module, a cathode circulation module, a dechlorination module, an absorption module, an alkali solution circulation output module, and a product storage module. Each module is connected in an orderly manner via pipelines and control valves, and the material delivery to each module is controlled by an electronic control console (which is prior art and not specifically described in this technical solution), forming a continuous production process. Its specific connection relationships and functions are as follows:

[0064] The domestic water input module is connected to the soft water module and the alkaline solution circulation output module through pipelines. It provides a water source for the soft water module to produce soft water and also participates in the alkaline solution concentration regulation of the alkaline solution circulation output module.

[0065] The soft water module is connected to the salt dissolving module and the water washing module respectively, and provides soft water to the salt dissolving module and the water washing module.

[0066] The salt dissolving module and the electrolysis module are connected by pipelines. The salt dissolving module is filled with industrial salt. After the industrial salt is dissolved in soft water, brine is generated. The salt dissolving module then transports the brine to the electrolysis module.

[0067] The electrolysis module is connected to the anode circulation module and the cathode circulation module through pipelines to form a circulation loop, so as to realize the electrolysis reaction of brine in a cyclical manner. The chlorine gas and dilute brine produced by electrolysis enter the anode circulation module. The dilute brine is the brine with reduced concentration after the brine electrolysis reaction, while the generated hydrogen gas and sodium hydroxide solution enter the cathode circulation module.

[0068] The water washing module is connected to the pipelines of the electrolysis module and the cathode circulation module. This is used for cleaning the electrolysis module after it is shut down, and also to replenish the sodium hydroxide solution in the cathode circulation module.

[0069] The anode circulation module is connected to the dechlorination module and the absorption module via pipelines. Chlorine is absorbed by the absorption module, while the brine is sent to the dechlorination module for dechlorination treatment. The chlorine produced during dechlorination is also absorbed by the absorption module.

[0070] The cathode circulation module and the alkali circulation output module are connected by pipelines. The alkali circulation output module is filled with premixed alkali solution. When the system is first started, the premixed alkali solution in the alkali circulation output module is pumped into the cathode circulation module to ensure the initial reaction conditions. When the system is running normally, the sodium hydroxide solution in the cathode circulation module flows into the alkali circulation output module, while the hydrogen gas is discharged from the cathode circulation module and diluted by a fan.

[0071] The alkaline solution circulation output module is connected to the dechlorination module and the absorption module via pipelines. The alkaline solution circulation output module outputs sodium hydroxide solution to the absorption module, where it participates in the synthesis of sodium hypochlorite. The alkaline solution circulation output module outputs sodium hydroxide solution to the dechlorination module, where it reacts with trace amounts of chlorine in the dechlorinated brine to generate trace amounts of sodium hypochlorite, preventing the volatilization of trace amounts of chlorine in the brine.

[0072] The dechlorination module and the salt dissolving module are connected by pipelines to return the dechlorinated brine to the salt dissolving module for recycling.

[0073] The absorption module and product storage module are connected by a pipeline system to transport the synthesized sodium hypochlorite to the product storage module.

[0074] The domestic water input module is for domestic water supply. The water softening module includes water softener A1 and water softener B2. The domestic water input module is connected to the inlet of water softener A1 and water softener B2. The outlet of water softener A1 and water softener B2 are connected to the salt dissolving module and water washing module respectively after being combined through pipes. The alkaline solution circulation output module is connected to the branch point of the domestic water input module through connecting pipe 5.

[0075] The salt dissolving module includes a salt dissolving tank 3 and a circulation pipeline 4. Industrial salt is filled in the salt dissolving tank 3. The two ends of the circulation pipeline 4 are connected and set on both sides of the bottom of the salt dissolving tank 3 to form a circulation loop for salt dissolution. One end of the circulation pipeline 4 is transported to the electrolysis module through a pipeline, and the other end is connected to the dechlorination module pipeline.

[0076] Specifically, the domestic water input module's domestic water flows into water softener A1 and water softener B2, where it is softened to produce soft water. This soft water then flows into the salt dissolving tank 3, where industrial salt dissolves into the soft water. The circulation pipe 4 then circulates the soft water through the salt dissolving tank 3. During this circulation, the industrial salt is fully dissolved, forming concentrated brine. The concentrated brine is then transported to the electrolysis module through the circulation pipe 4.

[0077] The electrolysis module is an ion-exchange membrane sodium hypochlorite generator, the anode circulation module is an anode circulation tank, the cathode circulation module is a cathode circulation tank, the dechlorination module is a dechlorination tower that uses physical dechlorination, preferably an air-stripping dechlorination tower, but vacuum dechlorination or heating dechlorination towers are also acceptable; the absorption module is an absorption tower, and the product storage module is a product storage tank.

[0078] Specifically, after the concentrated brine enters the electrolysis module, it undergoes an electrolysis reaction. The chlorine gas and dilute brine produced enter the anode circulation tank, while the sodium hydroxide solution and hydrogen gas produced enter the cathode circulation tank. The dilute brine circulates in the anode circulation tank, and the sodium hydroxide solution circulates in the cathode circulation tank, thus stabilizing the concentration of the sodium hydroxide solution.

[0079] Once the sodium hydroxide solution and the brine reach the preset levels, the sodium hydroxide solution flows into the alkaline solution circulation output module; the brine flows into the dechlorination tower and circulates within the tower to remove chlorine, thereby removing chlorine gas from the brine.

[0080] Sodium hydroxide solution from the alkaline solution circulation output module enters the absorption tower. At the same time, chlorine gas from the dechlorination tower and chlorine gas from the anode circulation module enter the absorption tower and undergo a sodium hypochlorite synthesis reaction. The synthesized sodium hypochlorite solution circulates in the absorption tower to form a sodium hypochlorite solution of the required concentration. The sodium hypochlorite solution of the required concentration is then stored in the product storage tank.

[0081] The alkali solution circulation output module includes an alkali dissolving tank A6 and an alkali dissolving tank B7. The alkali dissolving tank A6 is connected to the cathode circulation module via a pipeline, and the cathode circulation module and the alkali dissolving tank A6 form a circulation loop. The alkali dissolving tank B7 is connected to the connecting pipeline 5. The bottom of the alkali dissolving tank A6 and the alkali dissolving tank B7 are connected to the absorption module and the dechlorination module via pipelines.

[0082] Specifically, the premixed alkali solution is placed in the alkali dissolving tank A6, and its concentration is 20%~30%. When the system is started for the first time, the premixed alkali solution in the alkali dissolving tank A6 is pumped into the cathode circulation module to ensure the initial reaction conditions.

[0083] During normal system operation, the sodium hydroxide solution in the cathode circulation tank flows into the alkali dissolving tank A6, and then the sodium hydroxide solution in the alkali dissolving tank A6 flows into the alkali dissolving tank B7. At the same time, the domestic water in the connecting pipe 5 adjusts the concentration of the sodium hydroxide solution in the alkali dissolving tank B7 to 10%~15%. After adjustment, the sodium hydroxide solution in the alkali dissolving tank B7 flows into the absorption tower and the dechlorination tower. The sodium hydroxide solution in the absorption tower serves as the alkali raw material for the sodium hypochlorite synthesis reaction. The sodium hydroxide solution in the dechlorination tower reacts with trace amounts of chlorine gas in the dechlorinated brine in the dechlorination tower. The resulting mixed solution flows into the brine dissolving tank 3 through a pipeline, realizing the recycling of the brine.

[0084] When the system needs to be shut down for maintenance, close the pipe in connection 5 where domestic water flows into the alkali dissolving tank B7. After the sodium hydroxide solution in the alkali dissolving tank B7 has drained, close the connecting pipe between the alkali dissolving tank A6 and the alkali dissolving tank B7, and inject the sodium hydroxide solution from the cathode circulation tank into the alkali dissolving tank A6 to ensure the initial reaction conditions when the system is started.

[0085] The water washing module includes a high water level tank 8, a cathode water washing pipe 9, an anode water washing pipe 10, and an alkaline solution replenishment pipe 11. The outlets of water softeners A1 and B2 are connected in parallel with the high water level tank 8, the cathode water washing pipe 9, and the anode water washing pipe 10 after being merged through pipes. The front end of the cathode water washing pipe 9 is located close to the cathode of the electrolysis module, and the front end of the anode water washing pipe 10 is located close to the anode of the electrolysis module. The alkaline solution replenishment pipe 11 is connected to the bottom of the high water level tank 8, and the front end of the alkaline solution replenishment pipe 11 is connected to the cathode circulation module.

[0086] Specifically, when the system is working, the soft water from the combined flow of water softener A1 and water softener B2 fills the high water level tank 8. When the concentration of sodium hydroxide solution in the cathode circulation module is too high, the high water level tank 8 is activated, and soft water is delivered to the cathode circulation module through the alkaline water supply pipe 11, thereby adjusting the concentration of sodium hydroxide solution in the cathode circulation module.

[0087] When the system is shut down for maintenance, water softeners A1 and B2 introduce soft water into the high water level tank 8, and then the soft water is injected from the high water level tank 8 into the cathode water washing pipe 9 and the anode water washing pipe 10 to clean the cathode and anode of the electrolysis module.

[0088] Example 2, please refer to Figure 5The technical solution of this embodiment differs from that of Embodiment 1 in that the alkali dissolving tank A6 is connected to the cathode circulation module pipeline, and the cathode circulation module and the alkali dissolving tank A6 form a circulation loop. The bottom pipelines of the alkali dissolving tank A6 and the alkali dissolving tank B7 are closed by valves. The alkali dissolving tank A6 is connected to the dechlorination module pipeline and is also connected to an alkali storage module, which is an alkali storage tank. The alkali dissolving tank B7 is connected to the combined pipeline of water softener A1 and water softener B2 through a pipeline.

[0089] Specifically, during normal system operation, the sodium hydroxide solution in the cathode circulation tank flows into the alkali dissolving tank A6. When the sodium hydroxide solution in the alkali dissolving tank A6 reaches the full level, the sodium hydroxide solution in the alkali dissolving tank A6 is simultaneously transported to the alkali storage tank and the dechlorination module.

[0090] The softened water from the combined flow of water softeners A1 and B2 is injected into the alkali dissolving tank B7. The softened water in the alkali dissolving tank B7 flows into the absorption tower and reacts with the chlorine gas in the absorption tower to generate a mixed solution of hypochlorous acid and hydrochloric acid. The generated mixed solution of hypochlorous acid and hydrochloric acid is piped into the product storage tank. Meanwhile, the sodium hydroxide solution entering the dechlorination tower reacts with the trace amount of chlorine gas in the dechlorinated brine in the dechlorination tower. The resulting mixed solution flows into the brine dissolving tank 3 through a pipe, realizing the recycling of the brine.

[0091] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0092] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A smart electrolytic chlorine production and multi-element efficient absorption system, characterized in that: The application relates to a continuous closed-loop production process for sodium hypochlorite, which comprises a domestic water input module, a soft water module, a water washing module, a salt dissolving module, an electrolysis module, an anode circulation module, a cathode circulation module, a dechlorination module, an absorption module, an alkali liquor circulation output module and a product storage module. The modules are interconnected through pipelines and control valves to form a material conveying network, and the material conveying automation is controlled by an electric control operation table to form a continuous closed-loop production process. One end of the domestic water input module supplies raw water to the soft water module to prepare soft water, and the other end is connected to the alkali liquor circulation output module to adjust the concentration of the alkali solution. The soft water module supplies low-hardness dissolved water to the salt dissolving module and supplies soft water for cleaning and water replenishment to the water washing module. The salt dissolving module mixes industrial salt and soft water to form brine, which is conveyed to the electrolysis module. The electrolysis module forms independent circulation loops with the anode circulation module and the cathode circulation module, and electrolytic brine generates chlorine, dilute brine, hydrogen and sodium hydroxide solution, wherein the chlorine and the dilute brine are introduced into the anode circulation module, and the hydrogen and the sodium hydroxide solution are introduced into the cathode circulation module. The anode circulation module divides the chlorine into the absorption module and divides the dilute brine into the dechlorination module, and the dechlorination module synchronously introduces the chlorine generated by dechlorination into the absorption module. The cathode circulation module conveys the sodium hydroxide solution to the alkali liquor circulation output module, and the hydrogen is diluted by a fan and discharged. The alkali liquor circulation output module supplies the sodium hydroxide solution to the absorption module to participate in the synthesis of sodium hypochlorite, and simultaneously supplies the sodium hydroxide solution to the dechlorination module to react with the trace chlorine in the dilute brine after dechlorination to generate sodium hypochlorite to prevent chlorine volatilization. The dechlorination module returns the dilute brine after dechlorination to the salt dissolving module for reuse. The absorption module conveys the synthesized sodium hypochlorite product to the product storage module for storage.

2. The intelligent electrolytic chlorine generation and multi-element efficient absorption system according to claim 1, characterized in that: The soft water module comprises soft water device A (1) and soft water device B (2) arranged in parallel. The domestic water input module is connected to the water inlets of the soft water device A (1) and the soft water device B (2) through a branch pipeline, and the water outlets of the soft water device A (1) and the soft water device B (2) are connected to the salt dissolving module and the water washing module through a joint pipeline. The alkali liquor circulation output module is connected to the branch pipeline of the domestic water input module through a connecting pipeline (5).

3. The intelligent electrolytic chlorine generation and multi-element efficient absorption system according to claim 1, characterized in that: The salt dissolving module comprises a salt dissolving tank (3) and a circulation pipeline (4). The two ends of the circulation pipeline (4) are connected to the bottom of the salt dissolving tank (3) to form a forced circulation dissolving loop. One end of the circulation pipeline (4) is connected to the feed inlet of the electrolysis module through a conveying pipeline, and the other end is connected to the discharge outlet of the dechlorination module through a return pipeline. Industrial salt is filled in the salt dissolving tank (3), and soft water and industrial salt are mixed in the salt dissolving tank (3), and after circulation and dissolution through the circulation pipeline (4), concentrated brine is formed and then conveyed to the electrolysis module.

4. The intelligent electrolytic chlorine generation and multi-element efficient absorption system according to claim 1, characterized in that: The electrolysis module is an ion diaphragm type sodium hypochlorite generator, the anode circulation module is an anode circulation tank, the cathode circulation module is a cathode circulation tank, the dechlorination module is a physical dechlorination type dechlorination tower, the absorption module is an absorption tower, and the product storage module is a product storage tank. The dilute brine is circulated and enriched in the anode circulating tank, and the sodium hydroxide solution is kept at a stable concentration in the cathode circulating tank; when the dilute brine and the sodium hydroxide solution reach the preset liquid level, respectively, the dilute brine flows into the dechlorination tower, and the sodium hydroxide solution flows into the alkali liquor circulating output module.

5. The intelligent electrolytic chlorine generation and multi-element efficient absorption system according to claim 4, characterized in that: The dechlorination module is any one of an air stripping type dechlorination tower, a vacuum dechlorination type dechlorination tower or a heating dechlorination type dechlorination tower.

6. The intelligent electrolytic chlorine generation and multi-element efficient absorption system according to claim 1, characterized in that: The alkali liquor circulating output module comprises a dissolved alkali tank A (6) and a dissolved alkali tank B (7); The dissolved alkali tank A (6) and the cathode circulating module form a closed loop through a pipeline, the dissolved alkali tank B (7) is connected to the connecting pipeline (5) through a pipeline, and the bottom of the dissolved alkali tank A (6) and the dissolved alkali tank B (7) are connected through a pipeline with a valve to realize material transportation; The outlet of the dissolved alkali tank B (7) is connected to the inlet of the absorption module and the dechlorination module, respectively; The pre-mixed alkali liquor in the dissolved alkali tank A (6) has a preset concentration of 20% to 30%, the pre-mixed alkali liquor is pumped into the cathode circulating module when the system is started for the first time, the sodium hydroxide solution output by the cathode circulating module flows into the dissolved alkali tank A (6) and then flows into the dissolved alkali tank B (7) when the system is normally operated, and the connecting pipeline (5) transports domestic water to adjust the alkali liquor concentration in the dissolved alkali tank B (7) to 10% to 15%; When the system is shut down for maintenance, the pipeline through which the domestic water in the connecting pipeline (5) flows into the dissolved alkali tank B (7) is closed, the connecting pipeline between the dissolved alkali tank A (6) and the dissolved alkali tank B (7) is closed after the sodium hydroxide solution in the dissolved alkali tank B (7) is completely drained, and the sodium hydroxide solution of the cathode circulating module is injected into the dissolved alkali tank A (6) to ensure the initial reaction conditions for the next start-up.

7. The intelligent electrolytic chlorine generation and multi-element efficient absorption system according to claim 1, characterized in that: The water washing module comprises a high water level tank (8), a cathode water washing pipeline (9), an anode water washing pipeline (10) and an alkali liquor water supplement pipeline (11); The confluence pipeline of the soft water module is connected to the water inlet of the high water level tank (8), the water inlet end of the cathode water washing pipeline (9) and the water inlet end of the anode water washing pipeline (10) in parallel; The water outlet end of the cathode water washing pipeline (9) is arranged close to the cathode of the electrolysis module, and the water outlet end of the anode water washing pipeline (10) is arranged close to the anode of the electrolysis module; One end of the alkali liquor water supplement pipeline (11) is connected to the bottom of the high water level tank (8), and the other end is connected to the liquid supplement port of the cathode circulating module; When the system is working, the confluence soft water of the soft water module fills the high water level tank (8), the high water level tank (8) transports soft water through the alkali liquor water supplement pipeline (11) to adjust the concentration when the concentration of the sodium hydroxide solution in the cathode circulating module is too high, and the soft water is injected into the cathode water washing pipeline (9) and the anode water washing pipeline (10) through the high water level tank (8) when the system is shut down for maintenance to clean the cathode and the anode of the electrolysis module.

8. A smart electrolytic chlorine generation and multi-element high-efficiency absorption system, characterized in that: The system comprises the domestic water input module, the soft water module, the water washing module, the dissolved salt module, the electrolysis module, the anode circulating module, the cathode circulating module, the dechlorination module, the absorption module, the alkali liquor circulating output module and the product storage module, and further comprises an added alkali liquor storage module; The alkali liquor storage module is an alkali liquor storage tank; In the alkali liquor circulating output module, the connecting pipeline between the bottom of the dissolved alkali tank A (6) and the dissolved alkali tank B (7) is closed through a valve. The outlet of the alkali dissolving tank A (6) is divided into two paths, one of which is connected to the alkali liquid inlet of the dechlorination module, and the other is connected to the alkali liquid storage tank. The water inlet of the alkali dissolving tank B (7) is connected to the combined pipeline of the soft water module through an independent pipeline.

9. The intelligent electrolytic chlorine generation and multi-element efficient absorption system according to claim 8, characterized in that: The alkali dissolving tank A (6) and the cathode circulation module form a closed loop through a pipeline. When the system is running normally, the sodium hydroxide solution output by the cathode circulation module flows into the alkali dissolving tank A (6); when the sodium hydroxide solution in the alkali dissolving tank A (6) reaches the full liquid level, it is transported to the alkali liquid storage tank and the dechlorination module in a preset ratio through the flow distribution device, and the alkali liquid transported to the dechlorination module is used to react with trace chlorine in the brine.

10. The intelligent electrolytic chlorine generation and multi-element efficient absorption system according to claim 8, characterized in that: The outlet of the alkali dissolving tank B (7) is connected to the inlet of the absorption module. The combined soft water of the soft water module is injected into the alkali dissolving tank B (7), and then flows into the absorption module to react with chlorine to generate a mixed solution of hypochlorous acid and hydrochloric acid, which is transported to the product storage module. The mixed solution after reaction in the dechlorination module flows back to the salt dissolving tank (3) of the salt dissolving module for reuse.

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