Pick-up type high-concentration sodium hypochlorite production device

Abstract

The utility model relates to sodium hypochlorite production technical field, concretely the utility model discloses pry installation formula high concentration sodium hypochlorite production device, including base, is sequentially conveyed and is connected with sodium hydroxide mixing jar, temporary storage jar and spray mixing jar on the base, is provided with spray mixing structure in the spray mixing jar, is provided with static mixing jar with the bottom end intercommunication of spray mixing jar, is provided with static mixing structure in the static mixing jar, is provided with the sedimentation tank with the tail end connection of static mixing jar, is provided with centrifugal separator with the bottom end of sedimentation tank, is provided with first output and second output on centrifugal separator, and first output is used for outputing the sodium chloride crystal of deposit, is provided with liquid storage jar with the tail end connection of second output, the utility model discloses can improve high concentration sodium hypochlorite production efficiency and effect.

Description

Technical Field

[0001] This utility model relates to the field of sodium hypochlorite production technology, specifically to a skid-mounted high-concentration sodium hypochlorite production device. Background Technology

[0002] During the production and processing of caustic soda, brine is electrolyzed to produce sodium hydroxide and chlorine gas. Sodium hydroxide and chlorine gas react at low temperatures to produce sodium hypochlorite as a byproduct.

[0003] Sodium hypochlorite (NaClO) can be used as a highly efficient disinfectant and bleaching agent, and is widely used in water treatment, medical and health care, food processing and other fields.

[0004] Traditional production methods typically involve reacting chlorine gas with sodium hydroxide solution, but existing technologies have the following drawbacks: Low mixing efficiency: In conventional reaction devices, the contact between chlorine gas and sodium hydroxide solution is insufficient, resulting in incomplete reaction and low sodium hypochlorite yield. For example, in a high-concentration sodium hypochlorite production device disclosed in Chinese patent document CN218741965U, sodium hydroxide solution and chlorine gas are directly introduced into the reaction vessel through a single pipeline. This cannot achieve uniform and sufficient contact between sodium hydroxide solution and chlorine gas during the input, resulting in a longer reaction time and poor sufficiency.

[0005] In addition, the structure and process disclosed in the above patent documents have poor continuity: the above equipment adopts step-by-step operation, and when mixing caustic soda flakes with aqueous solution, chlorine gas cannot be introduced. The connection between sodium hydroxide dissolution, chlorine gas mixing and product separation is not smooth, making it difficult to achieve continuous production and resulting in low efficiency. Utility Model Content

[0006] The purpose of this invention is to provide a skid-mounted high-concentration sodium hypochlorite production device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a skid-mounted high-concentration sodium hypochlorite production device, including a base, which can be selected from existing movable bases or non-movable bases according to usage requirements, and a sodium hydroxide mixing tank, a temporary storage tank and a spray mixing tank are sequentially connected and conveyed on the base. The sodium hydroxide mixing tank is used to mix solid sodium hydroxide (commonly known as caustic soda flakes) with aqueous solution to form a sodium hydroxide solution with a low concentration. The temporary storage tank is used for temporary storage of the low concentration sodium hydroxide solution and provides sodium hydroxide liquid source to the spray mixing tank, so that the initial mixing of sodium hydroxide and subsequent mixing with chlorine gas can be carried out separately and independently. The spray mixing tank is equipped with a spray mixing structure. The bottom end of the spray mixing tank is connected to a static mixing tank, which is equipped with a static mixing structure. The tail end of the static mixing tank is connected to a sedimentation tank, and the bottom end of the sedimentation tank is equipped with a centrifuge. The centrifuge is equipped with a first output end and a second output end. The first output end is used to output precipitated sodium chloride crystals, and the tail end of the second output end is connected to a storage tank.

[0008] The present invention is further provided that the sodium hydroxide mixing tank, temporary storage tank, precipitation tank and liquid storage tank are all equipped with a stirring structure.

[0009] The present invention is further configured such that the stirring structure includes a stirring shaft, which is mounted in a corresponding position via bearings. A motor is driven to the top of the stirring shaft, and stirring blades are provided at the bottom. When the motor is started, the stirring shaft is controlled by the motor to drive the stirring blades to rotate, thereby realizing the stirring of the corresponding liquid. Here, the stirring speed of the motor can be flexibly controlled according to the requirements. The present invention does not limit the structure of the stirring blades, and one or more combinations of existing stirring blade structures such as double helix blades and anchor blades can be selected.

[0010] The present invention is further configured such that the sodium hydroxide mixing tank is provided with a feeding port and a water inlet pipe, the feeding port is provided with a protective cover, and a sodium hydroxide solution concentration detector is installed on the sodium hydroxide mixing tank. The feeding port is used for feeding solid sodium hydroxide product into the sodium hydroxide mixing tank. Since liquid sodium hydroxide is not convenient for long-term stable storage, solid sodium hydroxide is selected to prepare a low-concentration sodium hydroxide solution. The water inlet pipe is connected to a water source and can be opened and closed by a valve. The sodium hydroxide solution concentration detector can detect whether the mixed sodium hydroxide solution meets the concentration standard.

[0011] The present invention is further configured such that the spray mixing structure includes a solution spray pipe and a jet pipe, wherein multiple sets of solution spray pipes and jet pipes are arranged alternately in the spray mixing tank. The multiple sets of solution spray pipes are provided with liquid inlet pipes extending outward, and the multiple sets of jet pipes are provided with air inlet pipes extending outward. Chlorine gas is transported to the jet pipes through the air inlet pipes, and at the same time, a low-concentration sodium hydroxide solution stored in a temporary storage tank is transported to the solution spray pipes through the liquid inlet pipes, so that the gas and liquid are sprayed out together to achieve uniform and sufficient contact. The multi-layered and staggered arrangement can further improve the sufficient and uniform contact between the sodium hydroxide liquid and the chlorine gas, and improve the subsequent mixing efficiency and effect.

[0012] The present invention is further configured such that a spray head is provided at the bottom of the solution spray pipe facing downwards, and a jet head is provided at the top of the jet pipe facing upwards. Both the spray head and the jet head are preferably atomizing spray heads, which can further enhance the uniformity of the contact between sodium hydroxide solution and chlorine gas and improve the reaction effect.

[0013] The present invention is further configured such that the static mixing structure includes a tubular filling mixer and a helical blade mixer. The tubular filling mixer and the helical blade mixer are installed in the static mixing tank according to the conveying direction. The tubular filling mixer complicates the path of the fluid as it passes through the filling material by filling the conveying pipe structure with inert materials (such as metal rings, ceramic balls, etc.), thereby promoting mixing. The helical blade mixer consists of a series of left-handed / right-handed alternating helical blades fixed to the inner wall of the static mixing tank. When the fluid passes through the helical blades, it is divided and rotates in different directions, forming shear and radial mixing, thereby achieving automatic and thorough mixing between sodium hydroxide solution and chlorine gas during the flow process.

[0014] The present invention is further configured such that liquid transportation is achieved through the cooperation of a delivery pipeline and a pump between the sodium hydroxide mixing tank and the temporary storage tank, between the temporary storage tank and the inlet pipe, between the static mixing tank and the sedimentation tank, and between the second output end of the centrifuge and the storage tank.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. High-efficiency mixed reaction design This invention significantly improves the contact efficiency and reaction uniformity of sodium hydroxide solution and chlorine gas through a combination of a multi-layered, staggered spray mixing structure and a static mixing structure. The solution spray pipes and jet pipes inside the spray mixing tank are arranged in a staggered pattern, working in conjunction with atomizing nozzles to achieve bidirectional atomization contact between gas and liquid. Meanwhile, the tubular filled mixer and spiral blade mixer inside the static mixing tank further enhance the dynamic mixing effect of the fluids. This multi-stage mixing mechanism ensures complete reaction, effectively reduces the residue of unreacted substances, thereby improving the generation efficiency and concentration of sodium hypochlorite, while reducing raw material waste.

[0016] 2. Modular skid-mounted structure This unit adopts an integrated skid-mounted design, compactly arranging core components such as the sodium hydroxide mixing tank, temporary storage tank, spray mixing tank, static mixing tank, and sedimentation tank on the same base, facilitating transportation and rapid on-site installation. Each functional unit is seamlessly connected to pumps via piping, supporting continuous production operations. Furthermore, the inclusion of a stirring structure, temperature control, and concentration detectors further enhances operational convenience and process controllability. 3. This invention achieves efficient precipitation and separation of sodium chloride under low-temperature conditions through the synergistic effect of a temperature-controlled sedimentation tank and a centrifugal separator. The sedimentation tank maintains a low-temperature environment of 0–10°C, promoting preferential crystallization of sodium chloride while keeping sodium hypochlorite in a dissolved state. After centrifugation, both are output separately. This design not only improves the purity of the sodium hypochlorite solution but also enables the recovery and utilization of the byproduct sodium chloride, reducing wastewater treatment costs. The slow-speed assistance of the stirring structure further optimizes the crystallization process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the skid-mounted high-concentration sodium hypochlorite production device of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the skid-mounted high-concentration sodium hypochlorite production device of this utility model. Figure 2 ; Figure 3 This is a cross-sectional view of the internal structure of the sodium hydroxide mixing tank in this utility model; Figure 4 This is a cross-sectional view of the internal structure of the temporary storage tank in this utility model; Figure 5 This is a cross-sectional view of the internal structure of the spray mixing tank and the static mixing tank in this utility model.

[0018] The components represented by each number in the attached diagram are listed below: 1. Base; 2. Sodium hydroxide mixing tank; 3. Temporary storage tank; 4. Spray mixing tank; 5. Static mixing tank; 6. Sedimentation tank; 7. Centrifuge; 8. First output end; 9. Second output end; 10. Liquid storage tank; 11. Stirring shaft; 12. Motor; 13. Stirring blades; 14. Feed port; 15. Water inlet pipe; 16. Protective cover; 17. Sodium hydroxide solution concentration detector; 18. Solution spray pipe; 19. Air jet pipe; 20. Liquid inlet pipe; 21. Air inlet pipe; 22. Spray head; 23. Air jet head; 24. Tubular filling mixer; 25. Spiral blade mixer. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This utility model provides a technical solution: Please refer to Figures 1-5A skid-mounted high-concentration sodium hypochlorite production unit includes a base 1, which can be selected from existing movable base 1 or non-movable base 1 according to the usage requirements. The base 1 is sequentially connected to a sodium hydroxide mixing tank 2, a temporary storage tank 3, and a spray mixing tank 4. Sodium hydroxide mixing tank 2 is used to mix solid sodium hydroxide (commonly known as caustic soda flakes) with aqueous solution to form a sodium hydroxide solution with a low concentration, preferably with a NaOH solution concentration in the range of 5%–15%; Temporary storage tank 3 is used for temporary storage of low-concentration sodium hydroxide solution and provides sodium hydroxide solution to spray mixing tank 4. This allows the initial mixing of NaOH solution to be carried out separately from the subsequent mixing with chlorine gas, avoiding the situation where the mixing with chlorine gas in spray mixing tank 4 is interrupted due to low-concentration sodium hydroxide solution. The spray mixing tank 4 is equipped with a spray mixing structure; The spray mixing structure includes solution spray pipes 18 and jet pipes 19. Multiple sets of solution spray pipes 18 and jet pipes 19 are arranged alternately in the spray mixing tank 4. Multiple sets of solution spray pipes 18 extend outward to have liquid inlet pipes 20, and multiple sets of jet pipes 19 extend outward to have air inlet pipes 21. Chlorine gas is transported to the jet pipes 19 through the air inlet pipes 21. At the same time, low-concentration sodium hydroxide solution stored in the temporary storage tank 3 is transported to the solution spray pipes 18 through the liquid inlet pipes 20, so that the gas and liquid are sprayed out to achieve uniform and sufficient contact. The multi-layered and staggered arrangement can further improve the sufficient and uniform contact between sodium hydroxide liquid and chlorine gas, and improve the subsequent mixing efficiency and effect. The bottom end of the solution spray pipe 18 is provided with a spray head 22 facing downwards, and the top end of the jet pipe 19 is provided with a jet head 23 facing upwards. Both the spray head 22 and the jet head 23 are preferably atomizing nozzles, which can further enhance the uniformity of the sodium hydroxide solution when it comes into contact with chlorine gas and improve the reaction effect. The bottom end of the spray mixing tank 4 is connected to a static mixing tank 5, and a static mixing structure is provided inside the static mixing tank 5; The static mixing structure includes a tubular filling mixer 24 and a helical blade mixer 25. The tubular filling mixer 24 and the helical blade mixer 25 are installed in the static mixing tank 5 according to the conveying direction. The tubular filling mixer 24 complicates the path of the fluid as it passes through the filling material by filling the conveying pipe structure with inert materials (such as metal rings, ceramic balls, etc.), which promotes mixing. The helical blade mixer 25 consists of a series of left-handed / right-handed alternating helical blades fixed to the inner wall of the static mixing tank 5. When the fluid passes through the helical blades, it is divided and rotated in different directions, forming shear and radial mixing, thereby realizing automatic and thorough mixing between sodium hydroxide solution and chlorine gas during the flow process.

[0021] A sedimentation tank 6 is connected to the tail end of a static mixing tank 5. A centrifuge 7 is installed at the bottom of the sedimentation tank 6. A first output end 8 and a second output end 9 are provided on the centrifuge 7. The first output end 8 is used to output the precipitated sodium chloride crystals. A storage tank 10 is connected to the tail end of the second output end 9.

[0022] This invention includes stirring structures installed on the sodium hydroxide mixing tank 2, temporary storage tank 3, sedimentation tank 6, and liquid storage tank 10.

[0023] The stirring structure includes a stirring shaft 11, which is mounted in a corresponding position via bearings. A motor 12 is connected to the top of the stirring shaft 11, and stirring blades 13 are provided at the bottom. Start the motor 12, and the motor 12 controls the stirring shaft 11 to drive the stirring blades 13 to rotate, thereby realizing the stirring of the corresponding liquid; Here, the stirring speed of the motor 12 can be flexibly controlled according to the requirements. The structure of the stirring blade 13 is not limited in this utility model. One or more of the existing stirring blade 13 structures such as double helix blades and anchor blades can be selected.

[0024] Please see Figures 1-5 As one embodiment of the sodium hydroxide mixing tank 2: the sodium hydroxide mixing tank 2 is provided with a feeding port 14 and a water inlet pipe 15, a protective cover 16 is provided at the feeding port 14, and a sodium hydroxide solution concentration detector 17 is installed on the sodium hydroxide mixing tank 2. Feed port 14 is used for feeding solid sodium hydroxide products into sodium hydroxide mixing tank 2. Since liquid sodium hydroxide is not easy to store stably for a long time, solid sodium hydroxide is selected to prepare a low-concentration sodium hydroxide solution. The inlet pipe 15 is connected to a water source and can be opened and closed by a valve; The sodium hydroxide solution concentration detector 17 can detect whether the mixed sodium hydroxide solution meets the concentration standard.

[0025] In this invention, liquid transportation is achieved through the cooperation of a conveying pipeline and a pump between the sodium hydroxide mixing tank 2 and the temporary storage tank 3, between the temporary storage tank 3 and the inlet pipe 20, between the static mixing tank 5 and the sedimentation tank 6, and between the second output end 9 of the centrifugal separator 7 and the storage tank 10.

[0026] In summary, the working principle and specific workflow of this utility model are as follows: In use, the solid caustic soda flakes are first added to the sodium hydroxide mixing tank 2 through the feeding port 14. At the same time, clean water is injected into the sodium hydroxide mixing tank 2. Under the action of the stirring structure, the solid caustic soda flakes are stirred and mixed, so that the solid caustic soda flakes dissolve in the water and form a low-concentration sodium hydroxide solution. Preferably, the concentration of the NaOH solution is in the range of 5%–15%. Then, the well-mixed low-concentration sodium hydroxide solution is transported to temporary storage tank 3 for storage by a pump and a delivery pipeline. The above steps can then be repeated to produce low-concentration sodium hydroxide solution. At the same time, the low-concentration sodium hydroxide solution in the temporary storage tank 3 can be transported to the inlet pipe 20 by the action of the pump body and the pipeline structure, and then transported to the solution spray pipe 18 through the inlet pipe 20; Simultaneously, chlorine gas that reacts with it is introduced into the air inlet pipe 21, so that the sodium hydroxide solution is sprayed downward evenly through the spray head 22, while the chlorine gas in the same group is sprayed upward evenly through the jet head 23. After sufficient contact with the sodium hydroxide solution, the resulting mixture falls to the bottom of the spray mixing tank 4 and flows into the static mixing tank 5. In the above process, due to the multi-layered staggered arrangement of the solution spray pipe 18 and the jet pipe 19, the chlorine gas that has not fully reacted below can come into further contact with the sodium hydroxide liquid sprayed above, thus enhancing the sufficiency of contact between the sodium hydroxide solution and the chlorine gas. The mixture entering the static mixing tank 5 is automatically and fully mixed during the conveying process by the tubular filling mixer 24 and the spiral blade mixer 25, thereby improving the sufficiency of the reaction. In this process, the tubular filling mixer 24 fills the conveying chamber of the static mixing tank 5 with inert materials (such as metal rings, ceramic balls, etc.) to complicate the path of the fluid as it passes through the filling material, thereby promoting mixing. The spiral blade mixer 25 consists of a series of left-handed / right-handed alternating spiral blades fixed to the inner wall of the static mixing tank 5. When the fluid passes through the spiral blades, it is divided and rotates in different directions, forming shear and radial mixing, thereby achieving automatic and thorough mixing between sodium hydroxide solution and chlorine gas during the flow process and improving the sufficiency of the reaction. The resulting mixture is then transported to sedimentation tank 6, where the liquid contains NaClO, NaCl, and water.

[0027] In this utility model, the temporary storage tank 3, the spray mixing tank 4, the static mixing tank 5, the sedimentation tank 6, and the liquid storage tank 10 all adopt a tank structure with temperature control function. Preferably, the operating temperature of the temporary storage tank 3, the spray mixing tank 4, the static mixing tank 5, and the liquid storage tank 10 is maintained in the range of 0–30°C to avoid the decomposition of NaClO at high temperature. The operating temperature of the sedimentation tank 6 is maintained in the range of 0–10°C, which allows the NaCl component in the sedimentation tank 6 to precipitate preferentially, while NaClO remains in a dissolved state, thus achieving high-concentration extraction of NaClO. During this process, the corresponding motor 12 can be controlled to drive the stirring shaft 11 to slowly stir the stirring blades 13, which can improve the precipitation efficiency of NaCl. Then, the NaClO solution is separated from the precipitated NaCl by centrifuge 7, so that the NaClO solution is transported to the storage tank 10 for storage and later use, while the NaCl is output through the first output terminal 8. In this invention, the stirring structure is provided in the temporary storage tank 3 and the liquid storage tank 10 mainly to prevent the sedimentation of substances in the liquid. In this invention, the liquid inlet pipe 20 and the air inlet pipe 21 can both be controlled by flow valves and flow meters to adjust the liquid and air ratios, thereby improving the accuracy of the liquid-gas ratio.

[0028] All tank structures in this utility model can be equipped with pressure relief valves, control valves, detection instruments and other necessary components as required by actual needs. Other parts not described in this utility model are implemented using existing technology. In this utility model, the operation of relevant electrical components such as motors can be controlled by a PLC control system according to a set program. The specific working process and working principle of this utility model have been described in detail. Based on the above working process and working principle, those skilled in the art should know the specific circuit connection relationship and implement it through existing technology. Furthermore, the circuit connection relationship between relevant electrical components and the specific driver program are not the subject of protection of this utility model, and this utility model will not elaborate on them.

[0029] 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.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pry-mounted high-concentration sodium hypochlorite production device, comprising a base (1), characterized in that: The base (1) is sequentially connected to a sodium hydroxide mixing tank (2), a temporary storage tank (3), and a spray mixing tank (4). The spray mixing tank (4) is equipped with a spray mixing structure. The bottom end of the spray mixing tank (4) is connected to a static mixing tank (5). The static mixing tank (5) is equipped with a static mixing structure. The tail end of the static mixing tank (5) is connected to a sedimentation tank (6). The bottom end of the sedimentation tank (6) is equipped with a centrifuge (7). The centrifuge (7) is equipped with a first output end (8) and a second output end (9). The first output end (8) is used to output precipitated sodium chloride crystals. The tail end of the second output end (9) is connected to a storage tank (10).

2. The skid-mounted high-concentration sodium hypochlorite production device according to claim 1, characterized in that: The sodium hydroxide mixing tank (2), temporary storage tank (3), sedimentation tank (6) and liquid storage tank (10) are all equipped with stirring structures.

3. The skid-mounted high-concentration sodium hypochlorite production device according to claim 2, characterized in that: The stirring structure includes a stirring shaft (11), which is mounted in a corresponding position via bearings. A motor (12) is connected to the top of the stirring shaft (11), and stirring blades (13) are provided at the bottom.

4. The skid-mounted high-concentration sodium hypochlorite production device according to claim 1, characterized in that: The sodium hydroxide mixing tank (2) is provided with a feeding port (14) and a water inlet pipe (15). A protective cover (16) is provided at the feeding port (14). A sodium hydroxide solution concentration detector (17) is installed on the sodium hydroxide mixing tank (2).

5. The skid-mounted high-concentration sodium hypochlorite production device according to claim 1, characterized in that: The spray mixing structure includes a solution spray pipe (18) and a jet pipe (19). The solution spray pipe (18) and the jet pipe (19) are arranged in multiple sets in a staggered manner inside the spray mixing tank (4). The multiple sets of solution spray pipes (18) are provided with liquid inlet pipes (20) extending outward, and the multiple sets of jet pipes (19) are provided with air inlet pipes (21) extending outward.

6. The skid-mounted high-concentration sodium hypochlorite production device according to claim 5, characterized in that: The bottom end of the solution spray pipe (18) is provided with a spray head (22) facing downwards, and the top end of the jet pipe (19) is provided with a jet head (23) facing upwards.

7. The skid-mounted high-concentration sodium hypochlorite production device according to claim 1, characterized in that: The static mixing structure includes a tubular filling mixer (24) and a spiral blade mixer (25), which are installed in the static mixing tank (5) in the direction of conveying.

8. The skid-mounted high-concentration sodium hypochlorite production device according to claim 5, characterized in that: Liquid transport is achieved through the cooperation of transport pipelines and pumps between the sodium hydroxide mixing tank (2) and the temporary storage tank (3), between the temporary storage tank (3) and the inlet pipe (20), between the static mixing tank (5) and the sedimentation tank (6), and between the second output end (9) of the centrifuge (7) and the storage tank (10).

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