A chelating resin tower for brine treatment

Abstract

This utility model relates to the field of chelating resin tower technology, specifically a chelating resin tower for brine treatment. It includes a tower body with multiple sets of filter screens arranged vertically within the tower body. The edges of the filter screens are inclined downwards. A discharge pipe is provided on the side wall of the tower body to match the edge of the filter screen. An inlet pipe is provided on the side wall of the tower body to match each filter screen. A rotating shaft is mounted on the bottom of the tower body via a bearing, and a motor is mounted on the rotating shaft. The rotating shaft extends upwards and is connected to each filter screen via a bearing. A scraper is provided on the top surface of each filter screen on the rotating shaft. A water distribution pipe is provided at the top of the interior of the tower body, and multiple water spray pipes are provided at the bottom of the water distribution pipe. A water distributor can be detachably installed at the bottom of each water spray pipe. A drain assembly is provided at the bottom of the tower body. This utility model facilitates the replacement of resin particles, while providing good water distribution uniformity and excellent brine purification effect.

Description

Technical Field

[0001] This utility model relates to the field of chelating resin tower technology, specifically a chelating resin tower for brine treatment. Background Technology

[0002] In the caustic soda production process, brine purification is a crucial step in ensuring the efficient operation of the electrolysis process. If divalent metal ions such as calcium, magnesium, and iron contained in the crude brine are not thoroughly removed, they will deposit on the ion-exchange membrane or electrode surface during subsequent electrolysis, leading to decreased membrane performance, reduced current efficiency, and even equipment damage. Chelating resin towers, as commonly used brine purification equipment, selectively adsorb metal ions through the functional groups in the resin, thus achieving brine purification.

[0003] However, traditional resin towers suffer from problems such as uneven water distribution, insufficient resin regeneration, and difficulty in replacement, which affect the purification effect and operating efficiency. Specifically: Low resin utilization: Single-layer resin beds are prone to water flow short-circuiting or local overload, resulting in insufficient adsorption capacity and unstable purification effect. In addition, the single-layer resin setting results in a limited variety of resin particles, which leads to lower purification effect and efficiency for brine.

[0004] High maintenance costs: When the resin in the existing chelation resin tower fails, it needs to be replaced manually as a whole. Manual cleaning is inconvenient, cumbersome and inefficient, which affects continuous production.

[0005] Poor regeneration effect: Uneven distribution of regeneration solution and insufficient dynamic contact lead to incomplete resin regeneration and shortened lifespan.

[0006] Therefore, optimizing the resin tower structure to improve adsorption performance and simplify maintenance processes is of great significance for ensuring the stability and economy of caustic soda production. Utility Model Content

[0007] The purpose of this invention is to provide a chelating resin tower for brine treatment to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a chelating resin tower for brine treatment, comprising a tower body, wherein multiple sets of filter screens are arranged vertically within the tower body, the edges of the filter screens are inclined downwards, a discharge pipe is provided on the side wall of the tower body in conjunction with the edge of the filter screen, a feed pipe is provided on the side wall of the tower body in conjunction with each filter screen, a rotating shaft is mounted on the bottom end of the tower body via a bearing, and a motor is mounted on the rotating shaft, the rotating shaft extends upwards and is connected to each filter screen via a bearing, a scraper is provided on the rotating shaft in conjunction with the top surface of each filter screen, a water distribution pipe is provided at the top of the interior of the tower body, multiple water spray pipes are provided at the bottom of the water distribution pipe, a water distributor is detachably installed at the bottom end of each water spray pipe, and a liquid drainage assembly is provided at the bottom end of the tower body.

[0009] The present invention is further configured such that the draining assembly includes a first drain pipe and a second drain pipe, both of which are installed at the bottom of the tower body. The first drain pipe is used to drain the purified brine, and the second drain pipe is used to drain the residual liquid after the regenerated liquid and chelating resin have fully reacted.

[0010] The present invention is further configured such that the water distributor includes a connecting end, which is threadedly connected to the spray pipe. A water distribution seat is provided at the bottom end of the connecting end, and multiple spray pipes are connected to the water distribution seat. The water distributor and the spray pipes can be detachably installed through the threaded connection of the connecting end. In this way, it is easy to replace when a single water distributor is damaged. The water distribution seat and spray pipes can enhance the uniformity of water distribution of brine and regenerated liquid when entering the tower body, so that brine and regenerated liquid can be evenly contacted with chelating resin particles to achieve brine purification or chelating resin particle regeneration.

[0011] The present invention is further configured such that the water distribution pipe includes a ring pipe, and multiple sets of the ring pipe are nested inside and outside the ring pipe. A connecting pipe is provided between the multiple sets of the ring pipe, and the connecting pipe extends to the outside of the tower body and is connected to the liquid inlet assembly. Here, the water spray pipe is evenly distributed below each ring pipe, which can improve the uniformity of water distribution when brine and regenerated liquid enter the tower body.

[0012] The present invention is further configured such that the liquid inlet assembly includes a first liquid inlet pipe and a second liquid inlet pipe, wherein the first liquid inlet pipe is used to connect to a brine source and the second liquid inlet pipe is used to connect to a regeneration liquid source.

[0013] The present invention is further configured such that each of the feed pipes is located below the filter screen above and above the discharge pipes in the same group, thereby facilitating the feeding of chelating resin onto the corresponding filter screen.

[0014] The present invention is further configured such that a feed hopper is provided at the feed end of the feed pipe, and a protective cover is provided at the top of the feed hopper. The feed hopper can improve the convenience of chelating resin particles entering the tower body through the feed pipe, and the protective cover is used to protect the top of the feed hopper.

[0015] The present invention is further provided that valves are provided on the first liquid inlet pipe, the second liquid inlet pipe, the first liquid outlet pipe, the second liquid outlet pipe, the discharge pipe, and the feed pipe, so that the opening and closing of the first liquid inlet pipe, the second liquid inlet pipe, the first liquid outlet pipe, the second liquid outlet pipe, the discharge pipe, and the feed pipe can be easily controlled by the valves.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. Hierarchical adsorption and high-efficiency purification. This invention utilizes a multi-layered filter screen to fill different layers with chelating resin particles of varying properties (such as a combination of high-selectivity and high-capacity sections), achieving a graded adsorption function. This design significantly improves the removal efficiency of divalent metal ions such as calcium, magnesium, and iron, while optimizing resin utilization. Brine and regenerated solution are evenly distributed through multi-stage loop pipes and a water distributor, ensuring full contact with the resin and preventing localized overload or short-circuiting. Furthermore, an inert material pretreatment layer (such as quartz sand) can be added at the top to filter suspended solids and extend resin life, resulting in an overall purification effect superior to traditional single-layer resin tower structures.

[0017] 2. Convenient maintenance and resin replacement The inclined design of the filter screen in this invention, combined with a rotating scraper structure, greatly simplifies the resin replacement process. During replacement, the discharge pipe valve is opened and the motor is started. The rotating shaft drives the scraper to rotate, pushing the spent resin particles quickly out along the inclined filter screen. The design of the feed pipe and hopper facilitates the filling of new resin, and the rotating scraper also helps to distribute the resin evenly. This structure supports partial resin replacement, reducing maintenance costs, and avoids the incompleteness of traditional manual cleaning, making it particularly suitable for continuous production scenarios. 3. This utility model, through its independent first inlet pipe (brine source) and second inlet pipe (regenerated liquid source) design, coupled with dual drain pipes to separate the purified liquid and waste regenerated liquid, achieves seamless switching between operation and regeneration modes. The modular threaded connection structure of the water distributor facilitates maintenance and replacement, while the multi-directional distribution of the spray pipes ensures uniform coverage of the resin layer by the regenerated liquid. The scraper continuously rotates during the regeneration process, enhancing the dynamic contact between the resin and the regenerated liquid and improving regeneration efficiency. The centralized valve control system further simplifies the operation process, and the overall design balances functionality and maintainability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a chelating resin tower for brine treatment according to this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of a chelating resin tower for brine treatment according to this utility model. Figure 2 ; Figure 3 and Figure 4 These are cross-sectional views of the overall internal structure of this utility model from different perspectives; Figure 5 This is an exploded view of the working structure between the water distribution pipe and the water distributor in this utility model.

[0019] The components represented by each number in the attached diagram are listed below: 1. Tower body; 2. Filter screen cover; 3. Discharge pipe; 4. Feed pipe; 5. Rotating shaft; 6. Motor; 7. Scraper; 8. Water distribution pipe; 9. Spray pipe; 10. Water distributor; 11. First drain pipe; 12. Second drain pipe; 13. Connecting end; 14. Water distribution seat; 15. Spray pipe; 16. Ring pipe; 17. Connecting pipe; 18. First inlet pipe; 19. Second inlet pipe; 20. Feed hopper; 21. Protective cover; 22. Valve. Detailed Implementation

[0020] 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.

[0021] This utility model provides a technical solution: Please refer to Figures 1-5 A chelating resin tower for brine treatment includes a tower body 1. Multiple sets of filter screens 2 are arranged vertically within the tower body 1. The edges of the filter screens 2 slope downwards. A discharge pipe 3 is provided on the side wall of the tower body 1 to match the edge of the filter screen 2. A feed pipe 4 is provided on the side wall of the tower body 1 to match each filter screen 2. A rotating shaft 5 is mounted on the bottom of the tower body 1 via a bearing, and a motor 6 is mounted on the rotating shaft 5. The rotating shaft 5 extends upwards and is connected to each filter screen 2 via a bearing. A scraper 7 is provided on the top surface of each filter screen 2 on the rotating shaft 5. A water distribution pipe 8 is provided at the top of the interior of the tower body 1. Multiple water spray pipes 9 are provided at the bottom of the water distribution pipe 8. A water distributor 10 is detachably installed at the bottom of each water spray pipe 9. A liquid drainage assembly is provided at the bottom of the tower body 1.

[0022] Please see Figures 1-5 As one embodiment of the draining assembly: the draining assembly includes a first drain pipe 11 and a second drain pipe 12. Both the first drain pipe 11 and the second drain pipe 12 are installed at the bottom of the tower body 1. The first drain pipe 11 is used to drain the purified brine, and the second drain pipe 12 is used to drain the residual liquid after the regenerated liquid and chelating resin have fully reacted.

[0023] Please see Figures 1-5 As one embodiment of the water distributor 10: the water distributor 10 includes a connecting end 13, which is threadedly connected to the spray pipe 9. A water distribution seat 14 is provided at the bottom end of the connecting end 13, and multiple spray pipes 15 are connected to the water distribution seat 14. The water distributor 10 can be easily installed and removed from the spray pipe 9 through the connecting end 13. In this way, it is easy to replace when a single water distributor 10 is damaged. Through the setting of the water distribution seat 14 and the spray pipes 15, the uniformity of water distribution of brine and regenerated liquid when entering the tower body 1 can be enhanced, so that brine and regenerated liquid can be evenly contacted with chelating resin particles to achieve brine purification or chelating resin particle regeneration.

[0024] Please see Figures 1-5 As one embodiment of the water distribution pipe 8: the water distribution pipe 8 includes a ring pipe 16, with multiple sets of ring pipes nested inside and outside the ring pipe 16, and a connecting pipe 17 between the multiple sets of ring pipes 16. The connecting pipe 17 extends to the outside of the tower body 1 and is connected to the liquid inlet assembly. Here, the spray pipe 9 is evenly distributed below each ring pipe 16, which can improve the uniformity of water distribution when brine and regenerated liquid enter the tower body 1.

[0025] Please see Figures 1-5 As one embodiment of the liquid inlet assembly: the liquid inlet assembly includes a first liquid inlet pipe 18 and a second liquid inlet pipe 19, the first liquid inlet pipe 18 is used to connect to a brine source, and the second liquid inlet pipe 19 is used to connect to a regeneration liquid source.

[0026] Please see Figures 1-5 As one implementation of the feed pipe 4: each feed pipe 4 is located below the upper filter screen 2 and above the discharge pipe 3 of the same group, thereby facilitating the feeding of chelating resin onto the corresponding filter screen 2.

[0027] Please see Figures 1-5 As one implementation of the feed pipe 4: the feed end of the feed pipe 4 is provided with a feed hopper 20, and the top of the feed hopper 20 is provided with a protective cover 21. The feed hopper 20 can improve the convenience of chelating resin particles entering the tower body 1 through the feed pipe 4. The protective cover 21 is used to protect the top of the feed hopper 20.

[0028] This utility model is equipped with valves 22 on the first liquid inlet pipe 18, the second liquid inlet pipe 19, the first liquid outlet pipe, the second liquid outlet pipe, the discharge pipe 3, and the feed pipe 4. The valves 22 facilitate the opening and closing of the first liquid inlet pipe 18, the second liquid inlet pipe 19, the first liquid outlet pipe 11, the second liquid outlet pipe 12, the discharge pipe 3, and the feed pipe 4.

[0029] In summary, the working principle and specific workflow of this utility model are as follows: This invention, by setting up a multi-layered filter screen 2, allows for the placement of chelating resin particles of different properties within different sections of the filter screen 2, such as a high-selectivity section + a high-capacity section, thereby achieving graded adsorption and improving the efficiency of impurity removal. Meanwhile, the segmented structure facilitates partial resin replacement, reducing maintenance costs. This invention can add an inert material (such as quartz sand) as a pretreatment layer above the main resin layer to filter suspended solids and extend resin life. When in use, brine enters the tower body 1 through the first inlet pipe 18 and flows through different ring pipes 16 in the spray pipe 9 to achieve uniform distribution of brine during spraying. It then flows through the ring pipes 16 to the corresponding spray pipe 9, and enters the water distribution seat 14 through the cooperation of the spray pipe 9 and the connecting pipe 17. After being divided by the water distribution seat 14, the brine is evenly sprayed out in multiple directions through the spray pipe 15. In this utility model, the spray pipes 15 are evenly inclined and distributed on the water distribution base 14, and multiple spray holes can be provided on the spray pipes 15 to further enhance the uniformity of spraying. Thus, the brine flows through the chelating resin particles located above the filter screen 2, removing impurities such as divalent metal ions like calcium, magnesium, and iron, thereby purifying the brine. This invention employs a multi-stage chelating resin particle configuration with different properties to achieve graded adsorption, improve impurity removal efficiency, and discharge the purified brine through the first drain pipe 11. Once the chelating resin particles are saturated with adsorption, they need to be rinsed with a regeneration solution such as hydrochloric acid or sodium hydroxide to displace the metal ions. During this process, the inlet liquid of the first inlet pipe 18 and the outlet liquid of the first outlet pipe 11 are stopped, and the first inlet pipe 18 is opened so that the regenerated liquid can enter the interior of the liquid tower 1. Then, according to the principle of brine water distribution, uniform water distribution is achieved to improve the uniformity and fullness of the resin particle regeneration reaction. The regenerated liquid after rinsing is discharged through the second outlet pipe 12. Then, repeat the above process of adding saline solution to achieve the desired solution intake; If rinsing with clean water is required in the middle, a clean water pipe can be set in parallel with the first liquid inlet pipe 18 and the second liquid inlet pipe 19. When the chelated resin particles lose their regeneration ability and need to be replaced, open the valve 22 on the discharge pipe 3. Due to the inclined setting of the filter screen 2, the resin particles will automatically descend when discharged and be discharged through the discharge pipe 3. During this process, the motor 6 can be started, and the rotating shaft 5 driven by the motor 6 can rotate the scraper 7 to scrape the surface of the filter screen 2, drive the movement of the resin particles, and make the resin particles be discharged through the discharge pipe 3 more quickly and fully. After discharge, close the filter screen 2 and open the protective cover 21 and feed pipe 4 to transport new resin particles into the tower body 1 through the feed hopper 20 and feed pipe 4, and drop them onto the corresponding filter screen 2. During this process, the scraper 7 can be kept rotating to improve the uniform distribution of resin particles on the filter screen 2. Meanwhile, during the above-mentioned rinsing and regeneration process, the scraper 7 can be kept rotating, which can enhance the adequacy of rinsing and regeneration and improve the regeneration effect of the chelating resin.

[0030] In this utility model, each bearing connection part can be equipped with a mechanical seal structure; In this utility model, the operation of relevant electrical components such as motors and valves 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.

[0031] 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.

[0032] 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 chelating resin tower for brine treatment, comprising a tower body (1), characterized in that: Multiple sets of filter screens (2) are arranged vertically inside the tower body (1). The edges of the filter screens (2) are inclined downwards. A discharge pipe (3) is provided on the side wall of the tower body (1) in conjunction with the edge of the filter screen (2). A feed pipe (4) is provided on the side wall of the tower body (1) in conjunction with each filter screen (2). A rotating shaft (5) is installed at the bottom of the tower body (1) through a bearing, and a motor (6) is installed in conjunction with the rotating shaft (5). The rotating shaft (5) extends upwards and is connected to each filter screen (2) through a bearing. A scraper (7) is provided on the rotating shaft (5) in conjunction with the top surface of each filter screen (2). A water distribution pipe (8) is provided at the top of the interior of the tower body (1). Multiple water spray pipes (9) are provided at the bottom of the water distribution pipe (8). A water distributor (10) can be detachably installed at the bottom of each water spray pipe (9). A liquid drainage assembly is provided at the bottom of the tower body (1).

2. The chelating resin tower for brine treatment according to claim 1, characterized in that: The drain assembly includes a first drain pipe (11) and a second drain pipe (12), both of which are installed at the bottom of the tower body (1).

3. A chelating resin tower for brine treatment according to claim 2, characterized in that: The water distributor (10) includes a connecting end (13), which is threadedly connected to the spray pipe (9). A water distribution seat (14) is provided at the bottom of the connecting end (13), and multiple spray pipes (15) are connected to the water distribution seat (14).

4. A chelating resin tower for brine treatment according to claim 2, characterized in that: The water distribution pipe (8) includes a ring pipe (16), and multiple sets of the ring pipe (16) are nested inside and outside. A connecting pipe (17) is provided between the multiple sets of the ring pipe (16). The connecting pipe (17) extends to the outside of the tower body (1) and is connected to a liquid inlet assembly.

5. A chelating resin tower for brine treatment according to claim 4, characterized in that: The liquid inlet assembly includes a first liquid inlet pipe (18) and a second liquid inlet pipe (19). The first liquid inlet pipe (18) is used to connect to a brine source, and the second liquid inlet pipe (19) is used to connect to a regeneration liquid source.

6. A chelating resin tower for brine treatment according to claim 1, characterized in that: Each of the feed pipes (4) is located below the filter screen (2) above and above the discharge pipes (3) in the same group.

7. A chelating resin tower for brine treatment according to claim 1, characterized in that: The feed pipe (4) is provided with a feed hopper (20) at the feed end, and a protective cover (21) is provided at the top of the feed hopper (20).

8. A chelating resin tower for brine treatment according to claim 5, characterized in that: Valves (22) are provided on the first liquid inlet pipe (18), the second liquid inlet pipe (19), the first liquid outlet pipe (11), the second liquid outlet pipe (12), the discharge pipe (3), and the feed pipe (4).

Images