Online recovery device for ammonia gas after electrolysis

Abstract

The utility model discloses a post-electrolysis ammonia gas on-line recovery device, which belongs to the technical field of ammonia gas treatment and comprises an electrolytic bath, one end of the electrolytic bath is communicated with a liquid inlet and outlet pipe, the cathode of the electrolytic bath is communicated with a gas delivery pipe, and one end of the gas delivery pipe far away from the electrolytic bath is communicated with a sub-liquid blending barrel. According to the device, waste etching liquid is guided into the electrolytic bath through the liquid inlet and outlet pipe, the electrolytic bath is powered on, then ammonia gas is generated by a negative electrode, the ammonia gas is guided into the sub-liquid blending barrel through the gas conveying pipe, and the ammonia gas is absorbed into the sub-liquid blending barrel through the gas conveying pipe. According to the etching liquid production line, the etching liquid is mixed with other materials, redundant ammonia enters the ammonia water absorption barrel through the overflow pipe to form ammonia water, the ammonia water flows back to the etching liquid mixing barrel, and the mixed solution in the etching liquid mixing barrel is discharged back to the etching liquid production line through the liquid discharge pipe, so that the ammonia is fully recycled, and meanwhile, the ammonia is prevented from polluting the air.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia treatment, in particular to an on-line ammonia recovery device after electrolysis. Background Technique

[0002] During the electrolysis of alkaline etching solution, ammonia gas generated usually directly enters the acid solution spray absorption tower through the exhaust duct for treatment and then is discharged. This not only causes waste of ammonia gas but also increases the chemical agent cost for treating ammonia gas.

[0003] In the prior art, the Chinese utility model content with the publication number: CN219482193U discloses an ammonia absorption and treatment device, belonging to the technical field of ammonia treatment equipment. It includes a bracket and an absorption tower device arranged on the bracket. A spray component is arranged inside the absorption tower device. The absorption tower device includes a filtration chamber and a dissolution chamber communicated with the filtration chamber. The filtration chamber is arranged above the dissolution chamber, and an air vent is arranged at the top of the filtration chamber. The filtration chamber is an isosceles trapezoid hollow structure, and a plurality of filter layers are arranged inside the filtration chamber; the spray component is arranged at the top of the dissolution chamber. One side of the dissolution chamber is connected with a gas guide pipe, and the output end of the gas guide pipe faces the bottom of the dissolution chamber. A discharge pipeline is arranged at the bottom of the dissolution chamber, and valves are arranged on both the discharge pipeline and the gas guide pipe. Through the provision of the filtration chamber and the dissolution chamber, ammonia gas reacts with the spray liquid to form ammonia water and falls into the inner cavity of the absorption tower device for storage, so that the gas is filtered before being discharged through the air vent. This setting effectively reduces the pollution of ammonia gas to the surrounding air.

[0004] In the above technical solution, part of the ammonia gas is converted into ammonia water by using the absorption tower device and discharged from the discharge pipeline for recycling. However, part of the ammonia gas still discharges from the air vent, causing waste of ammonia gas and polluting the surrounding air. Utility Model Content

[0005] The purpose of the utility model is to provide an on-line ammonia recovery device after electrolysis. Ammonia gas is generated by electrolyzing the alkaline etching waste liquid produced by the etching solution production line. The ammonia gas is circulated in the sub-liquid preparation barrel and the ammonia water absorption barrel to fully absorb and reuse the ammonia gas. It is synthesized into etching solution again and guided back into the etching solution production line. The ammonia gas can be fully utilized and will not be discharged into the air, improving the ammonia gas recovery rate and reducing the pollution to the air at the same time, so as to solve the problems raised in the above background technique.

[0006] To achieve the above object, the present utility model provides the following technical solutions: An on-line ammonia recovery device after electrolysis, comprising an electrolytic cell, and further comprising an inlet and outlet liquid pipe, a gas transmission pipe, a sub-liquid preparation barrel, an overflow pipe, an ammonia water absorption barrel, a return pipe, a liquid discharge pipe and a stirring assembly. One end of the electrolytic cell is communicated with the inlet and outlet liquid pipe, the negative electrode of the electrolytic cell is communicated with the gas transmission pipe, the end of the gas transmission pipe away from the electrolytic cell is communicated with the sub-liquid preparation barrel, the top of the sub-liquid preparation barrel is communicated with the overflow pipe, the end of the overflow pipe away from the sub-liquid preparation barrel is communicated with the ammonia water absorption barrel, the bottom of the side wall of the ammonia water absorption barrel is communicated with the return pipe, the end of the return pipe away from the ammonia water absorption barrel is communicated with the sub-liquid preparation barrel, the bottom of the sub-liquid preparation barrel is communicated with the liquid discharge pipe, stirring assemblies are arranged in both the sub-liquid preparation barrel and the ammonia water absorption barrel, and both the liquid discharge pipe and the inlet and outlet liquid pipe are communicated with the etching solution production line.

[0007] Preferably, the stirring assembly includes a stirring motor installed at the bottom of the sub-liquid preparation barrel and the ammonia water absorption barrel. The output shaft of the stirring motor respectively penetrates into the inner cavities of the sub-liquid preparation barrel and the ammonia water absorption barrel and is fixed with a stirring shaft, and stirring blades are fixed on the outer side of the stirring shaft.

[0008] Preferably, a dispersion box is fixed at the bottom of the inner wall of the ammonia water absorption barrel. The dispersion box is rotationally connected with the stirring shaft through a bearing. The end of the overflow pipe away from the sub-liquid preparation barrel penetrates through the ammonia water absorption barrel and is communicated with the dispersion box, and nozzles are communicated with the periphery of the top of the dispersion box.

[0009] Preferably, a first gas transmission pump is installed on the gas transmission pipe, a second gas transmission pump is installed on the overflow pipe, and liquid transmission pumps are installed on the inlet and outlet liquid pipe and the liquid discharge pipe.

[0010] Preferably, first control valves are installed on the inlet and outlet liquid pipe, the overflow pipe and the return pipe, and a check valve is further installed on the overflow pipe.

[0011] Preferably, a temperature control device is arranged outside the ammonia water absorption barrel, a temperature control adjuster is arranged on the temperature control device, and a pressure monitor is further installed on the top of the ammonia water absorption barrel.

[0012] Preferably, the height of the end of the return pipe close to the ammonia water absorption barrel is higher than the height of the end close to the sub-liquid preparation barrel, and the ammonia water absorption barrel is higher than the sub-liquid preparation barrel.

[0013] Preferably, a feeding port is further arranged on the top of the sub-liquid preparation barrel, and a sealing cover is arranged on the top of the feeding port.

[0014] Preferably, an ammonia collector is arranged around the negative electrode of the electrolytic cell, and the gas transmission pipe is communicated with the ammonia collector.

[0015] Preferably, a drain pipe is connected to one end of the liquid inlet and outlet pipe close to the electrolytic cell, and a second control valve is installed on the drain pipe.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. In the present utility model, the etching waste liquid is introduced into the electrolytic cell through the liquid inlet and outlet pipe, the electrolytic cell is electrified, and then ammonia gas is generated at the negative electrode and introduced into the sub-liquid preparation barrel through the gas transmission pipe. The sub-liquid of the etching solution is prepared by mixing with other materials. The excess ammonia gas enters the ammonia water absorption barrel through the overflow pipe, forms ammonia water and flows back to the sub-liquid preparation barrel. The solution prepared in the sub-liquid preparation barrel is discharged back into the etching solution production line through the drain pipe, realizing the full recovery and utilization of ammonia gas, and at the same time avoiding the pollution of ammonia gas to the air.

[0018] 2. Through the arrangement of the stirring assembly, the present utility model facilitates the stirring of the liquids in the sub-liquid preparation barrel and the ammonia water absorption barrel, promoting uniform reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural diagram of the present utility model;

[0020] Figure 2 is a three-dimensional sectional structural diagram of the sub-liquid preparation barrel of the present utility model;

[0021] Figure 3 is a three-dimensional sectional structural diagram of the ammonia water absorption barrel of the present utility model;

[0022] Figure 4 is a three-dimensional structural diagram of the electrolytic cell of the present utility model.

[0023] Reference numerals in the figures: 1. Electrolytic cell; 2. Liquid inlet and outlet pipe; 3. Gas transmission pipe; 4. Sub-liquid preparation barrel; 5. Overflow pipe; 6. Ammonia water absorption barrel; 7. Return pipe; 8. Drain pipe; 9. Stirring assembly; 91. Stirring motor; 92. Stirring shaft; 93. Stirring blade; 10. Dispersion box; 11. Sprayer; 12. First gas transmission pump; 13. Second gas transmission pump; 14. Liquid delivery pump; 15. First control valve; 16. Check valve; 17. Temperature control device; 18. Pressure monitor; 19. Feeding port; 20. Sealing cover; 21. Ammonia collector; 22. Drain pipe; 23. Second control valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] The utility model provides an on-line ammonia recovery device after electrolysis as shown in Figures 1 to 4 which includes an electrolytic cell 1, and also includes a liquid inlet and outlet pipe 2, a gas transmission pipe 3, a sub-liquid preparation barrel 4, an overflow pipe 5, an ammonia water absorption barrel 6, a reflux pipe 7, a drain pipe 8 and a stirring assembly 9. One end of the electrolytic cell 1 is communicated with the liquid inlet and outlet pipe 2, the negative electrode of the electrolytic cell 1 is communicated with the gas transmission pipe 3, the end of the gas transmission pipe 3 far away from the electrolytic cell 1 is communicated with the sub-liquid preparation barrel 4, the top of the sub-liquid preparation barrel 4 is communicated with the overflow pipe 5, the end of the overflow pipe 5 far away from the sub-liquid preparation barrel 4 is communicated with the ammonia water absorption barrel 6, the bottom of the side wall of the ammonia water absorption barrel 6 is communicated with the reflux pipe 7, the end of the reflux pipe 7 far away from the ammonia water absorption barrel 6 is communicated with the sub-liquid preparation barrel 4, the bottom of the sub-liquid preparation barrel 4 is communicated with the drain pipe 8, stirring assemblies 9 are arranged in both the sub-liquid preparation barrel 4 and the ammonia water absorption barrel 6, and the drain pipe 8 and the liquid inlet and outlet pipe 2 are both communicated with the etching solution production line;

[0026] The etching waste liquid is introduced into the electrolytic cell 1 through the liquid inlet and outlet pipe 2, the electrolytic cell 1 is electrified, then ammonia gas is generated at the negative electrode, and is introduced into the sub-liquid preparation barrel 4 through the gas transmission pipe 3, and is mixed with other materials to adjust the etching solution sub-liquid. The excess ammonia gas enters the ammonia water absorption barrel 6 through the overflow pipe 5, forms ammonia water and flows back to the sub-liquid preparation barrel 4. The solution prepared in the sub-liquid preparation barrel 4 is discharged back into the etching solution production line through the drain pipe 8, so as to fully recover and utilize ammonia gas, and at the same time avoid the pollution of ammonia gas to the air.

[0027] Furthermore, as shown in Figure 2 and Figure 3 the stirring assembly 9 includes a stirring motor 91 installed at the bottom of the sub-liquid preparation barrel 4 and the ammonia water absorption barrel 6. The output shaft of the stirring motor 91 respectively penetrates into the inner cavities of the sub-liquid preparation barrel 4 and the ammonia water absorption barrel 6 and is fixed with a stirring shaft 92. Stirring blades 93 are fixed on the outer side of the stirring shaft 92. By driving the stirring shaft 92 to rotate through the stirring motor 91, and then using the stirring blades 93 to stir the liquids in the sub-liquid preparation barrel 4 and the ammonia water absorption barrel 6, not only can different raw materials be mixed, but also the gas and the liquid can be uniformly contacted, avoiding local heating and temperature rise.

[0028] In addition, as shown in Figure 3 a dispersion box 10 is fixed at the bottom of the inner wall of the ammonia water absorption barrel 6. The dispersion box 10 is rotationally connected with the stirring shaft 92 through a bearing. The end of the overflow pipe 5 far away from the sub-liquid preparation barrel 4 penetrates through the ammonia water absorption barrel 6 and is communicated with the dispersion box 10. The peripheries of the top of the dispersion box 10 are communicated with spray heads 11. Through the arrangement of the dispersion box 10, it is convenient to introduce ammonia gas into the liquid in the ammonia water absorption barrel 6 from multiple groups of spray heads 11, and absorb the ammonia gas fully and quickly.

[0029] Furthermore, as shown in Figure 1As shown, a first gas delivery pump 12 is installed on the gas delivery pipe 3, a second gas delivery pump 13 is installed on the overflow pipe 5, and a liquid delivery pump 14 is installed on the liquid inlet and outlet pipe 2 and the liquid discharge pipe 8. Through the cooperation of the first gas delivery pump 12 and the second gas delivery pump 13, it is convenient to transport ammonia gas, and then the liquid inlet and outlet pipe 2 and the liquid discharge pipe 8 transport the liquid through the liquid delivery pump 14 for flow.

[0030] In a further preferred embodiment, as Figures 1 - 4 shown, first control valves 15 are installed on the liquid inlet and outlet pipe 2, the overflow pipe 5 and the return pipe 7, and a check valve 16 is also installed on the overflow pipe 5. Through the setting of the first control valves 15, it is convenient to control the on-off of the liquid inlet and outlet pipe 2, the overflow pipe 5 and the return pipe 7. Then, the check valve 16 is installed on the overflow pipe 5 to prevent ammonia gas from directly flowing back into the sub-liquid preparation tank 4 without passing through the ammonia water absorption tank 6, and the ammonia water required for synthesizing the etching liquid sub-liquid cannot be obtained under normal pressure.

[0031] In addition, as Figure 1 and Figure 3 shown, a temperature control device 17 is provided outside the ammonia water absorption tank 6, a temperature control debugger is provided on the temperature control device 17, and a pressure monitor 18 is also installed on the top of the ammonia water absorption tank 6. Through the cooperation of the temperature control device, it is convenient to control the temperature inside the ammonia water absorption tank 6. At the same time, the pressure monitor 18 can monitor the pressure value inside the ammonia water absorption tank 6 to ensure that the ammonia water absorption tank 6 maintains an appropriate temperature and pressure, and improves the conversion rate of ammonia gas into ammonia water.

[0032] Preferably, as Figure 1 shown, the height of one end of the return pipe 7 close to the ammonia water absorption tank 6 is higher than the height of the end close to the sub-liquid preparation tank 4, and the ammonia water absorption tank 6 is higher than the sub-liquid preparation tank 4. By limiting the heights of both ends of the return pipe 7, the liquid in the return pipe 7 can be automatically guided by gravity.

[0033] In addition, as Figure 1 and Figure 2 shown, a feeding port 19 is also provided on the top of the sub-liquid preparation tank 4, and a sealing cover 20 is provided on the top of the feeding port 19. Through the setting of the feeding port 19 and the sealing cover 20, it is convenient to add the raw materials required for preparing the etching liquid into the sub-liquid preparation tank 4.

[0034] It should be noted that, as Figure 1 and Figure 4 shown, an ammonia collector 21 is provided around the negative electrode of the electrolytic cell 1, and the gas delivery pipe 3 is communicated with the ammonia collector 21. Through the ammonia collector 21, it is convenient to collect the ammonia gas near the negative electrode in the electrolytic cell 1, and then introduce it into the sub-liquid preparation tank 4 through the gas delivery pipe 3 for rapid collection of ammonia gas.

[0035] It should be noted that, as Figure 1 andFigure 4 As shown, one end of the liquid inlet and outlet pipe 2 close to the electrolytic cell 1 is communicated with a drain pipe 22, and a second control valve 23 is installed on the drain pipe 22. By communicating the drain pipe 22 with the liquid inlet and outlet pipe 2, it is convenient to discharge the waste liquid in the electrolytic cell 1.

[0036] During specific use, connect the liquid inlet and outlet pipe 2 and the liquid discharge pipe 8 to the etching solution production line. First, introduce the etching waste liquid into the electrolytic cell 1 through the liquid inlet and outlet pipe 2, and energize the electrolytic cell 1. Ammonia generated near the negative electrode is collected by the ammonia collector 21, and then the first air pump 12 on the gas transmission pipe 3 introduces the ammonia into the sub-liquid preparation barrel 4. At the same time, other raw materials for preparing the etching solution are added from the feeding port 19. The excess ammonia is transported to the ammonia water absorption barrel 6 by the second air pump 13 through the overflow pipe 5. Under the conditions of controlling the temperature and air pressure, the ammonia dissolves in water to form ammonia water, and then the ammonia water flows back into the sub-liquid preparation barrel 4 through the return pipe 7. In the sub-liquid preparation barrel 4, it reacts with other raw materials of the etching solution to synthesize the sub-liquid of the etching solution, and then is discharged back into the etching solution production line through the liquid discharge pipe 8 to supplement the etching solution.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An on-line ammonia recovery device after electrolysis, comprising an electrolytic cell (1), characterized in that: It further includes an inlet / outlet liquid pipe (2), a gas transmission pipe (3), a sub-liquid preparation barrel (4), an overflow pipe (5), an ammonia-water absorption barrel (6), a reflux pipe (7), a drain pipe (8) and a stirring assembly (9). One end of the electrolytic cell (1) is communicated with the inlet / outlet liquid pipe (2), the negative electrode of the electrolytic cell (1) is communicated with the gas transmission pipe (3), the end of the gas transmission pipe (3) far from the electrolytic cell (1) is communicated with the sub-liquid preparation barrel (4), the top of the sub-liquid preparation barrel (4) is communicated with the overflow pipe (5), the end of the overflow pipe (5) far from the sub-liquid preparation barrel (4) is communicated with the ammonia-water absorption barrel (6), the bottom of the side wall of the ammonia-water absorption barrel (6) is communicated with the reflux pipe (7), the end of the reflux pipe (7) far from the ammonia-water absorption barrel (6) is communicated with the sub-liquid preparation barrel (4), the bottom of the sub-liquid preparation barrel (4) is communicated with the drain pipe (8), stirring assemblies (9) are arranged in both the sub-liquid preparation barrel (4) and the ammonia-water absorption barrel (6), and both the drain pipe (8) and the inlet / outlet liquid pipe (2) are communicated with the etching solution production line.

2. The on-line ammonia recovery device after electrolysis according to claim 1, characterized in that: The stirring assembly (9) includes a stirring motor (91) installed at the bottom of the sub-liquid preparation barrel (4) and the ammonia-water absorption barrel (6). The output shaft of the stirring motor (91) respectively penetrates into the inner cavities of the sub-liquid preparation barrel (4) and the ammonia-water absorption barrel (6) and is fixed with a stirring shaft (92). Stirring blades (93) are fixed on the outer side of the stirring shaft (92).

3. An on-line ammonia recovery device after electrolysis according to claim 1, characterized in that: A dispersion box (10) is fixed at the bottom of the inner wall of the ammonia-water absorption barrel (6). The dispersion box (10) is rotationally connected with the stirring shaft (92) through a bearing. The end of the overflow pipe (5) far from the sub-liquid preparation barrel (4) penetrates through the ammonia-water absorption barrel (6) and is communicated with the dispersion box (10). Spray heads (11) are communicated around the top of the dispersion box (10).

4. An on-line ammonia recovery device after electrolysis according to claim 1, characterized in that: A first gas transmission pump (12) is installed on the gas transmission pipe (3), a second gas transmission pump (13) is installed on the overflow pipe (5), and a liquid transmission pump (14) is installed on the inlet / outlet liquid pipe (2) and the drain pipe (8).

5. The on-line ammonia recovery device after electrolysis according to claim 1, characterized in that: First control valves (15) are installed on the inlet / outlet liquid pipe (2), the overflow pipe (5) and the reflux pipe (7), and a check valve (16) is also installed on the overflow pipe (5).

6. An on-line ammonia recovery device after electrolysis according to claim 1, characterized in that: A temperature control device (17) is arranged outside the ammonia-water absorption barrel (6). A temperature control adjuster is arranged on the temperature control device (17), and a pressure monitor (18) is also installed on the top of the ammonia-water absorption barrel (6).

7. An on-line ammonia recovery device after electrolysis according to claim 1, characterized in that: The height of the end of the reflux pipe (7) close to the ammonia-water absorption barrel (6) is higher than the height of the end close to the sub-liquid preparation barrel (4), and the ammonia-water absorption barrel (6) is higher than the sub-liquid preparation barrel (4).

8. The on-line ammonia recovery device after electrolysis according to claim 1, characterized in that: A feeding port (19) is further arranged on the top of the sub-liquid preparation barrel (4), and a sealing cover (20) is arranged on the top of the feeding port (19).

9. An on-line ammonia recovery device after electrolysis according to claim 1, characterized in that: An ammonia collector (21) is arranged around the negative electrode of the electrolytic cell (1), and the gas transmission pipe (3) is communicated with the ammonia collector (21).

10. An on-line ammonia recovery device after electrolysis according to claim 1, characterized in that: One end of the inlet / outlet liquid pipe (2) close to the electrolytic cell (1) is communicated with a drain pipe (22), and a second control valve (23) is installed on the drain pipe (22).

Images