Anti-fouling self-cleaning device for a cuprous cyanide solution evaporator
By using a spiral injection hole to create vortex impact and a staggered baffle design, combined with chemical dissolution, the scaling problem of cuprous cyanide solution evaporators is solved, achieving efficient, clean, and safe production.
Patent Information
- Application Number
- CN202522132411.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-09
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-10-09
AI Technical Summary
Cuprous cyanide solution evaporators are prone to scaling after long-term use. Existing cleaning methods cannot effectively cover the weld seams and dead corners of the heating tubes, resulting in scale residue, which affects heat transfer efficiency and creates a vicious cycle, requiring frequent shutdowns for cleaning and affecting production continuity.
The spiral structure of the injection hole forms a vortex impact and a baffle plate misalignment design. Combined with the chemical dissolution effect of aminosulfonic acid solution, the vortex 360° rotating impact force efficiently removes scale and prevents leakage of toxic gases and waste liquids.
It achieves thorough cleaning of the inner wall of the heating tube, prevents accelerated scaling, ensures long-term stable heat transfer efficiency and operational safety of the evaporator, avoids frequent shutdowns, and ensures production continuity.
Smart Images
Figure CN224672093U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of evaporator cleaning devices, and in particular to a self-cleaning device for preventing scaling in a cuprous cyanide solution evaporator. Background Technology
[0002] Cuprous cyanide solution is widely used as a core component of copper plating solutions or as a raw material for organic synthesis because it can provide stable complexed copper ions. To meet the concentration requirements of subsequent processes or to achieve solvent recovery and material purification, it is often necessary to use a falling film evaporator for evaporation and concentration. With its vacuum low-temperature evaporation characteristics, the falling film evaporator can reduce the risk of producing highly toxic hydrogen cyanide due to the high-temperature decomposition of cuprous cyanide. In addition, the slender structure of its heating tube can expand the heat transfer area, making it suitable for the needs of continuous industrial production and becoming the mainstream equipment for processing cuprous cyanide solution.
[0003] Cuprous cyanide solution evaporators are prone to scaling after prolonged use. Existing cleaning methods often employ a straight-line spray pattern using ordinary spray pipes. In practice, this means the cleaning solution only flows along the central area of the pipe, failing to reach the weld seams and bottom of the pipe, areas where scaling remains difficult to reach. Furthermore, cuprous cyanide scale (containing copper salt complexes) has extremely strong adhesion, and the impact force of a straight water flow alone cannot achieve efficient removal. Each cleaning cycle reveals significant residual scaling on the inner wall of the heating tubes. This residual scaling directly impacts subsequent evaporation processes—uneven film distribution in the scaling areas leads to a significant decrease in heat transfer efficiency during film formation within the heating tubes. Simultaneously, the residual scaling accelerates the scaling rate in subsequent evaporation processes, creating a vicious cycle of "scaling - decreased efficiency - more prone to scaling," ultimately requiring frequent shutdowns for repeated cleaning, severely disrupting normal production processes and affecting production continuity. Utility Model Content
[0004] To address the shortcomings of existing technologies, this invention provides a self-cleaning device for preventing scaling in cuprous cyanide solution evaporators. This device solves the problem of scale buildup in cuprous cyanide solution evaporators during long-term use. Existing cleaning methods using conventional spray pipes with straight jets cannot cover dead corners such as weld seams and bottoms of heating tubes, and are difficult to remove the highly adhesive scale (containing copper salt complexes). As a result, residue remains on the inner wall of the heating tubes after cleaning, leading to uneven film formation, decreased heat transfer efficiency, and accelerated scaling during subsequent evaporation. This creates a vicious cycle of "scaling - decreased efficiency - more prone to scaling," requiring frequent shutdowns for cleaning and severely impacting production continuity.
[0005] To achieve the above objectives, this utility model provides the following technical solution: A self-cleaning device for preventing scaling in a cuprous cyanide solution evaporator includes a falling film evaporator body. A cover plate is sealed and snapped onto the upper end of the falling film evaporator body. Slots are equidistantly spaced on the cover plate, and a feed inlet is fixedly installed at the upper end of the cover plate. A fixed plate is fixedly installed inside the falling film evaporator body, and heating tubes are equidistantly fixedly installed inside the fixed plate. A distributor is disposed inside the falling film evaporator body, located above the fixed plate. A baffle plate is fixedly installed on the inner wall of the distributor. The distributor has a first injection hole. A baffle plate is rotatably mounted on the baffle plate, and a second injection hole is formed on the baffle plate. The second injection hole corresponds one-to-one with the first injection hole. A self-cleaning mechanism is provided between the fixed plate and the distributor. The self-cleaning mechanism includes an injection plate, which is positioned between the fixed plate and the distributor, and can be activated by the alignment of the first and second injection holes. The staggered arrangement enables the switching between normal material conveying and clean operation, ensuring that the material enters the heating tube evenly through the distributor during evaporation, and also preparing for the sealing and isolation during subsequent self-cleaning, thus balancing the continuity of the evaporation process with the switchability of the cleaning operation.
[0006] Preferably, the injection plate has a third injection hole, and the inner wall of each third injection hole has a spiral structure. The third injection hole is distributed in a one-to-one correspondence with the second injection hole and the first injection hole. Connecting pipes are installed at equal intervals on the side wall of the injection plate, and fixing rings are fixedly installed on the four connecting pipes. The spiral inner wall causes the solution to form a 360° vortex, which greatly improves the flushing coverage of the inner wall of the heating tube. With the stable support of the connecting pipes and fixing rings, the cleaning fluid is delivered in a directional and efficient manner, providing a structural guarantee for the complete removal of stubborn cuprous cyanide scale.
[0007] Preferably, the lower end of the fixing ring is fixedly equipped with inserts at equal intervals, and the four inserts are respectively inserted into the slots and fixed to the falling film evaporator body. The upper end of the fixing ring is symmetrically fixedly equipped with brackets, and a suction pump is fixedly installed between the two brackets. The fixing of the brackets to the suction pump ensures the stable output of the cleaning fluid delivery power, so that the aminosulfonic acid solution can continuously and evenly enter the filling plate, ensuring the continuity of the self-cleaning process and the stability of the impact force.
[0008] Preferably, the upper end of the suction pump is connected to an inlet pipe, and the lower end of the suction pump is fixedly installed with threaded strips at equal intervals. Threaded rings are installed inside the four threaded strips, and inner strips are fixedly installed inside the threaded rings. Sealing plugs are fixedly installed inside the inner strips. The sealing plugs are directly opposite the inlet, effectively blocking the leakage of toxic gases and the splashing of waste liquid. The threaded adjustment design allows for flexible control of the sealing state according to the working conditions, taking into account both safety during cleaning and the feeding needs during daily evaporation.
[0009] Compared with the prior art, the present invention has the following beneficial effects: This invention employs a synergistic design where the third injection hole of the spiral structure creates a vortex impact of the aminosulfonic acid solution, while the misalignment of the baffle plate forms a shielding structure to ensure safety. This design effectively removes stubborn cuprous cyanide scale adhering to the inner wall of the heating tube by utilizing the 360° rotating impact force of the vortex and the chemical dissolving effect of aminosulfonic acid, achieving thorough cleaning. At the same time, it avoids the leakage of toxic gases and splashing of waste liquid during the cleaning process, ensuring effective prevention of scale formation on the heating tube under safe operating conditions, and guaranteeing the long-term stable heat transfer efficiency and operational safety of the falling film evaporator. Attached Figure Description
[0010] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.
[0011] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is an exploded structural diagram of the heating tube of this utility model; Figure 3 This is a diagram showing the connection structure of the injection disc of this utility model; Figure 4 This is an exploded view of the baffle connection of this utility model; Figure 5 This is an exploded view of the threaded ring connection of this utility model; Figure 6 This is a structural diagram of the sealing plug connection of this utility model.
[0012] Legend: 1. Falling film evaporator body; 2. Cover plate; 3. Slot; 4. Feed inlet; 5. Fixing plate; 6. Heating tube; 7. Distributor; 8. Baffle plate; 9. First injection hole; 10. Baffle plate; 11. Second injection hole; 12. Injection plate; 13. Third injection hole; 14. Connecting pipe; 15. Fixing ring; 16. Insert; 17. Support; 18. Suction pump; 19. Feed pipe; 20. Threaded strip; 21. Threaded ring; 22. Inner strip; 23. Sealing plug. Detailed Implementation
[0013] This application provides a self-cleaning device for preventing scaling in cuprous cyanide solution evaporators. This effectively solves the problem of scaling buildup in cuprous cyanide solution evaporators during long-term use. Existing cleaning methods using straight-line spraying from ordinary spray pipes cannot cover dead corners such as the weld seams and bottom of the heating tubes, and are difficult to remove the highly adhesive cuprous cyanide (containing copper salt complexes) scale. This results in residue remaining on the inner wall of the heating tubes after cleaning, leading to uneven film formation, decreased heat transfer efficiency, and accelerated scaling during subsequent evaporation, creating a vicious cycle of "scaling - decreased efficiency - more prone to scaling." This necessitates frequent shutdowns for cleaning, severely impacting production continuity. This invention utilizes a synergistic design of vortex impact from the spiral third injection hole and misaligned baffle shielding. It efficiently removes cuprous cyanide scale from the heating tubes through vortex impact and chemical dissolution, while preventing leakage of toxic gases / waste liquids during cleaning, thus safely preventing scaling and ensuring long-term stable heat transfer and safe operation of the evaporator. Example
[0014] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the technical solution in this application embodiment effectively solves the problem of scaling in cuprous cyanide solution evaporators after long-term use. Existing cleaning methods using conventional straight-line spraying with ordinary spray pipes cannot cover dead corners such as the weld seams and bottom of the heating tubes, and are difficult to remove the highly adhesive cuprous cyanide (containing copper salt complexes) scale. This results in residue remaining on the inner wall of the heating tubes after cleaning, leading to uneven film formation, decreased heat transfer efficiency, and accelerated scaling during subsequent evaporation, creating a cycle of "scaling - decreased efficiency - more prone to scaling." The vicious cycle of frequent shutdowns for cleaning severely impacts production continuity. The overall approach is as follows: A self-cleaning device for preventing scaling in a cuprous cyanide solution evaporator includes a falling film evaporator body 1. A cover plate 2 is connected to the upper end of the falling film evaporator body 1 via a snap-fit and sealing ring. Slots 3 are evenly spaced on the cover plate 2. A feed inlet 4 is fixedly installed on the upper end of the cover plate 2. A fixed plate 5 is fixedly installed inside the falling film evaporator body 1. Heating tubes 6 are evenly spaced and fixedly installed inside the fixed plate 5. A distributor 7 is located inside the falling film evaporator body 1, above the fixed plate 5. A baffle plate 8 is fixedly installed on the inner wall of the distributor 7. A first injection hole 9 is opened on the distributor 7. A baffle plate 10 is rotatably mounted on the baffle plate 8. A second injection hole 11 is provided on the top, and the second injection hole 11 is distributed one-to-one with the first injection hole 9. A self-cleaning mechanism is provided between the fixed plate 5 and the distributor 7. The self-cleaning mechanism includes an injection plate 12, which is located between the fixed plate 5 and the distributor 7. When in use, the cover plate 2 is moved upward first. After the cover plate 2 moves upward, the baffle plate 10 can be rotated on the baffle plate 8. Under the rotation of the baffle plate 10, the second injection hole 11 will be misaligned with the first injection hole 9 to form a shielding structure. The shielding structure formed by the misalignment of the second injection hole 11 and the first injection hole 9 can block the direct communication between the inside of the evaporator and the external environment during cleaning, avoid the leakage of trace gas generated by the reaction of aminosulfonic acid solution and residual cuprous cyanide, and at the same time prevent the cleaning waste liquid from splashing out, forming a physical barrier. The injection plate 12 has a third injection hole 13. The inner wall of each third injection hole 13 has a spiral structure. The third injection hole 13 is distributed in a one-to-one correspondence with the second injection hole 11 and the first injection hole 9. Connecting pipes 14 are installed at equal intervals on the side wall of the injection plate 12. Fixing rings 15 are fixedly installed on the four connecting pipes 14.
[0015] The lower end of the fixing ring 15 is fixedly equipped with four inserts 16 at equal intervals. The four inserts 16 are respectively inserted into the slots 3 and fixed to the falling film evaporator body 1. The upper end of the fixing ring 15 is symmetrically fixed with brackets 17. A suction pump 18 is fixedly installed between the two brackets 17. The upper end of the suction pump 18 is connected to the feed pipe 19. At this time, the feed pipe 19 can be connected to the aminosulfonic acid solution. Then the suction pump 18 can be started. Under the action of the suction pump 18, the aminosulfonic acid solution will be sprayed out through the connecting pipe 14 and then injected into the injection plate 12. After passing through the third injection hole 13 inside the injection plate 12, a vortex is formed and impacts the heating tube 6. At this time, the aminosulfonic acid solution will form a vortex in each heating tube 6, cleaning the inside of the heating tube 6. The vortex state can generate a 360° rotating impact force. Compared with ordinary linear spraying, it can more efficiently remove the copper cyanide deposits attached to the inner wall of the heating tube (especially the stubborn scale in the dead corners and welds of the tube). Physical flushing and chemical dissolution work together to improve the thoroughness of cleaning.
[0016] Threaded strips 20 are fixedly installed at equal intervals at the lower end of the suction pump 18. Threaded rings 21 are installed inside the threads of the four threaded strips 20. Inner strips 22 are fixedly installed inside the threaded rings 21, and sealing plugs 23 are fixedly installed inside the inner strips 22. The sealing plugs 23 are directly opposite the feed inlet 4. When the equipment is in use, cuprous cyanide solution can be injected into the falling film evaporator body 1 through the feed inlet 4. After injection, the threaded rings 21 can be rotated on the threaded strips 20. The rotation of the threaded rings 21 will drive the sealing plugs 23 to move downwards. When the sealing plugs 23 slide into the feed inlet 4, the seal will be completed. This can quickly block the connection between the feed inlet 4 and the outside after the cuprous cyanide solution is injected, avoiding leakage and splashing of the solution due to the unsealed feed inlet. Even a small amount of cuprous cyanide solution leakage may cause personnel poisoning through contact or volatilization. Sealing cuts off this risk at the source.
[0017] To address the problems existing in the prior art, this utility model provides a self-cleaning device for preventing scaling in a cuprous cyanide solution evaporator. This utility model utilizes a synergistic design of vortex impact from the spiral third injection hole and misaligned baffle to efficiently remove cuprous cyanide scale from the heating tube through vortex impact and chemical dissolution, while also preventing leakage of toxic gases / waste liquids during cleaning. This ensures safe scaling prevention and guarantees long-term stable heat transfer and safe operation of the evaporator.
[0018] Working principle: First, when using it, move the cover plate 2 upward. After the cover plate 2 moves upward, the baffle plate 10 can be rotated on the baffle plate 8. Under the rotation of the baffle plate 10, the second injection hole 11 will be misaligned with the first injection hole 9 to form a shielding structure. The shielding structure formed by the misalignment of the second injection hole 11 and the first injection hole 9 can block the direct connection between the inside of the evaporator and the external environment during cleaning, avoid the leakage of trace gas generated by the reaction of aminosulfonic acid solution and residual cuprous cyanide, and at the same time prevent the cleaning waste liquid from splashing out, forming a physical barrier. In the second step, the feed pipe 19 can be connected to the aminosulfonic acid solution, and then the suction pump 18 can be started. Under the action of the suction pump 18, the aminosulfonic acid solution will be sprayed out through the connecting pipe 14 and then injected into the injection plate 12. After passing through the third injection hole 13 inside the injection plate 12, a vortex is formed and impacts the heating tube 6. At this time, the aminosulfonic acid solution will form a vortex in each heating tube 6, cleaning the inside of the heating tube 6. The vortex state can generate a 360° rotating impact force, which can more efficiently remove the cuprous cyanide deposits attached to the inner wall of the heating tube (especially the stubborn scale in the dead corners and weld seams of the tube). The physical flushing and chemical dissolution work together to improve the thoroughness of cleaning.
[0019] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A self-cleaning device for preventing scaling in a cuprous cyanide solution evaporator, comprising a falling film evaporator body (1), wherein a cover plate (2) is sealed and snapped onto the upper end of the falling film evaporator body (1), and slots (3) are equally spaced on the cover plate (2), and a feed inlet (4) is fixedly installed on the upper end of the cover plate (2), characterized in that, A fixed plate (5) is fixedly installed inside the falling film evaporator body (1). Heating tubes (6) are fixedly installed at equal intervals inside the fixed plate (5). A distributor (7) is provided inside the falling film evaporator body (1). The distributor (7) is located above the fixed plate (5). A baffle plate (8) is fixedly installed in the inner wall of the distributor (7). A first injection hole (9) is opened on the distributor (7). A baffle plate (10) is rotatably installed on the baffle plate (8). A second injection hole (11) is opened on the baffle plate (10). The second injection hole (11) is distributed one-to-one with the first injection hole (9). A self-cleaning mechanism is provided between the fixed disk (5) and the distributor (7); The self-cleaning mechanism includes a filling plate (12), which is disposed between the fixed plate (5) and the distributor (7).
2. The anti-scaling self-cleaning device for a cuprous cyanide solution evaporator as described in claim 1, characterized in that, The injection plate (12) is provided with a third injection hole (13), and the inner wall of each third injection hole (13) is spiral; The third injection hole (13) is distributed in a one-to-one correspondence with the second injection hole (11) and the first injection hole (9).
3. The anti-scaling self-cleaning device for a cuprous cyanide solution evaporator as described in claim 2, characterized in that, Connecting pipes (14) are installed at equal intervals on the side wall of the injection plate (12). Among them, four connecting pipes (14) are fixedly installed with fixing rings (15).
4. The anti-scaling self-cleaning device for a cuprous cyanide solution evaporator as described in claim 3, characterized in that, Inserts (16) are fixedly installed at equal intervals at the lower end of the fixing ring (15); The four inserts (16) are respectively inserted into the slots (3) and fixed to the falling film evaporator body (1).
5. The anti-scaling self-cleaning device for a cuprous cyanide solution evaporator as described in claim 4, characterized in that, The upper end of the fixing ring (15) is symmetrically fixed with brackets (17); A suction pump (18) is fixedly installed between the two brackets (17).
6. The anti-scaling self-cleaning device for a cuprous cyanide solution evaporator as described in claim 5, characterized in that, The upper end of the suction pump (18) is connected to the feed pipe (19). Among them, the lower end of the suction pump (18) is fixedly equipped with threaded strips (20) at equal intervals.
7. The anti-scaling self-cleaning device for a cuprous cyanide solution evaporator as described in claim 6, characterized in that, The four threaded bars (20) are internally threaded with threaded rings (21); The threaded ring (21) has an inner strip (22) fixedly installed inside it.
8. The anti-scaling self-cleaning device for a cuprous cyanide solution evaporator as described in claim 7, characterized in that, A sealing plug (23) is fixedly installed inside the inner strip (22); The sealing plug (23) is directly opposite the feed inlet (4).