Chelate resin tower regeneration system

Abstract

The utility model provides a chelating resin tower regeneration system, which relates to the field of resin tower regeneration and comprises a resin tower, a process air inlet and a first wastewater outlet are arranged at the top of the resin tower, a saline water replacement inlet, an acid inlet and a second wastewater outlet are respectively arranged on the side wall of the upper part of the resin tower, and a lower opening is arranged at the bottom; the process air input pipeline, the wastewater output pipeline, the replacement saline water input pipeline, the acid liquor input pipeline, the deionized water input pipeline, the alkali liquor input pipeline, the replacement saline water output pipeline and the saline water output pipeline are arranged outside the tower; a pH meter is arranged on the saline water output pipeline, the output end of the saline water output pipeline is respectively connected with the first output pipeline and the second output pipeline and is respectively connected to the primary refined salt water tank and the secondary refined salt water tank, and control valves are respectively arranged on the two output pipelines and are respectively electrically connected with the pH meter; the salt water output by the resin tower regeneration system is shunted and selectively conveyed to the primary refined salt water tank or the secondary refined salt water tank according to the pH value of the salt water, so that the damage to an ionic membrane is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of resin tower regeneration, and particularly relates to a chelating resin tower regeneration system. Background Art

[0002] In the chlor-alkali production process, there is a process of treating primary refined brine into secondary refined brine. Specifically, the primary refined brine is heated to 60±5°C through a heat exchanger and sent to a chelating resin tower. After the heavy metal ions in the brine are adsorbed by it, it then passes through a resin trap to trap the broken resin in the brine, and the secondary refined brine is sent to the electrolysis process for use.

[0003] As a device for secondary refining of brine, the chelating resin tower is equipped with a certain number of chelating resins, distribution pipes, water caps and other accessories inside. After the chelating resin in the tower adsorbs a certain amount of impurities and reaches saturation and can no longer adsorb impurity ions, it needs to be taken offline for regeneration.

[0004] In the prior art, the regeneration of chelating resin towers mostly adopts the method disclosed in the publication number CN104624250A, that is, through 19 regeneration steps. It solves the problems that the saturation of the brine in the chelating resin tower is low after it is put into operation and the need for personnel to increase the flow rate to supplement the liquid level after the chelating resin tower is put into operation. However, in production practice, those skilled in the art have found that when the secondary brine produced by this production line is used for electrolysis, there is sometimes a phenomenon of damaging the ion exchange membrane, which affects the service life of the ion exchange membrane.

[0005] Therefore, the inventor of this case explored the reasons and aimed to solve the above technical problems through the improvement of the equipment circuit. Summary of the Utility Model

[0006] The utility model provides a chelating resin tower regeneration system for the above problems existing in the prior art.

[0007] The technical solution of the utility model to solve the above technical problems is as follows: A chelating resin tower regeneration system, characterized in that it includes a resin tower, a process air inlet and a first waste water outlet are arranged at the top of the resin tower, a brine replacement inlet, an acid inlet and a second waste water outlet are respectively arranged on the upper side wall of the resin tower, and a lower outlet is arranged at the bottom of the resin tower;

[0008] The process air inlet is connected to a process air input pipeline, the first waste water outlet and the second waste water outlet are respectively connected to a waste water output pipeline, the brine replacement inlet is connected to a replacement brine input pipeline, the acid inlet is connected to an acid solution input pipeline, and the lower outlet is respectively connected to a deionized water input pipeline, an alkali solution input pipeline, a replacement brine output pipeline and a brine output pipeline;

[0009] The output end of the brine output pipeline is connected to a filter, the output end of the filter is connected to a brine output pipeline, a pH meter is arranged on the brine output pipeline, the output end of the brine output pipeline is respectively connected to a first output pipeline and a second output pipeline, the output end of the first output pipeline is connected to a primary refined brine tank, and the output end of the second output pipeline is connected to a secondary refined brine tank;

[0010] The first output pipeline and the second output pipeline are respectively provided with control valves, and the two control valves are respectively electrically connected to the pH meter.

[0011] Furthermore, the input end of the deionized water input pipeline is connected to a deionized water source.

[0012] Furthermore, the deionized water source is connected to the alkali solution input pipeline together with the alkali solution through another pipeline, and the deionized water source is connected to the acid solution input pipeline together with the acid solution through another pipeline.

[0013] Furthermore, the output end of the wastewater output pipeline is connected to the acidic wastewater storage tank and the alkaline wastewater storage tank through two pipelines respectively.

[0014] Furthermore, the input end of the replacement brine input pipeline is connected to a secondary refined brine tank.

[0015] Furthermore, the output end of the replacement brine output pipeline is connected to a brine recovery tank.

[0016] The beneficial effects of the utility model are as follows: the utility model satisfies the resin tower regeneration procedure through the reasonable arrangement of the pipeline, and at the same time, a pH meter is added to the brine output line to monitor the brine output by the filter online, and its output is divided into two routes, which are respectively connected to the primary refined brine tank and the secondary refined brine tank, and the two control valves are electrically connected to the pH meter. If the pH of the brine is within the qualified range, the control valve on the second output pipeline is opened to transport the brine to the secondary refined brine tank. If the pH of the brine is high, the control valve on the first output pipeline is opened to transport the brine to the primary refined brine tank, and the primary refined brine in the tank will be refined again by the resin tower. In this way, the qualified brine in the secondary refined brine tank is ensured, thereby avoiding the damage of the secondary refined brine to the ion membrane of its subsequent process, which is conducive to improving the service life of the ion membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] In the figure: 1. Resin tower, 11. Process air inlet, 12. First wastewater outlet, 13. Brine replacement inlet, 14. Acid inlet, 15. Second wastewater outlet, 16. Lower outlet, 2. Process air input pipeline, 3. Wastewater output pipeline, 4. Replacement brine input pipeline, 5. Acid solution input pipeline, 6. Deionized water input pipeline, 7. Alkali solution input pipeline, 8. Replacement brine output pipeline, 9. Brine output pipeline, 10. Filter, 101. pH meter, 21. First output pipeline, 22. Second output pipeline, 23. Primary refined brine tank, 24. Secondary refined brine tank, 25. Brine recovery tank, 26. Acidic wastewater storage tank, 27. Alkaline wastewater storage tank, 28. Deionized water source. Detailed implementation mode

[0019] The principle and features of the present utility model will be described below. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0020] As Figure 1 shown, the chelating resin tower regeneration system of this embodiment includes a resin tower 1. A process air inlet 11 and a first wastewater outlet 12 are provided at the top of the resin tower 1. A brine replacement inlet 13, an acid inlet 14 and a second wastewater outlet 15 are respectively provided on the upper side wall of the resin tower 1. A lower outlet 16 is provided at the bottom of the resin tower 1;

[0021] The process air inlet 11 is connected to a process air input pipeline 2. The first wastewater outlet 12 and the second wastewater outlet 15 are respectively connected to a wastewater output pipeline 3. The brine replacement inlet 13 is connected to a replacement brine input pipeline 4. The acid inlet 14 is connected to an acid solution input pipeline 5. The lower outlet 16 is respectively connected to a deionized water input pipeline 6, an alkali solution input pipeline 7, a replacement brine output pipeline 8 and a brine output pipeline 9;

[0022] The output end of the brine output pipeline 9 is connected to a filter 10. The output end of the filter 10 is connected to a brine output pipeline 9. A pH meter 101 is provided on the brine output pipeline 9. The output end of the brine output pipeline 9 is respectively connected to a first output pipeline 21 and a second output pipeline 22. The output end of the first output pipeline 21 is connected to a primary refined brine tank 23. The output end of the second output pipeline 22 is connected to a secondary refined brine tank 24;

[0023] Control valves are respectively provided on the first output pipeline 21 and the second output pipeline 22, and the two control valves are respectively electrically connected to the pH meter 101.

[0024] More specifically, the input end of the deionized water input pipeline 6 is connected to the deionized water source 28. The deionized water source 28 is jointly merged with the caustic solution into the caustic solution input pipeline 7 through another pipeline, and the deionized water source 28 is also jointly merged with the acid solution into the acid solution input pipeline 5 through another pipeline. The output end of the waste water output pipeline 3 is respectively connected to the acidic waste water storage tank 26 and the alkaline waste water storage tank 27 through two pipelines. The input end of the replacement brine input pipeline 4 is connected to the secondary refined brine tank 24, and the output end of the replacement brine output pipeline 8 is connected to the brine recovery tank 25.

[0025] The regeneration system adopting this solution combines with the existing regeneration method to carry out the chelating resin tower regeneration procedure. Among them, the brine output through the brine output pipeline 9 is divided into two paths after passing through the filter 10. One pipeline leads to the primary refined brine tank, which serves as the raw material tank for the secondary refining of brine using the resin tower, and the other pipeline leads to the secondary refined brine tank, which serves as the raw material tank for the electrolysis of caustic soda by the ion-exchange membrane method. In this solution, by adding a pH meter 101 and electrically connecting it to the control valves on the first output pipeline 21 and the second output pipeline 22 respectively, it is used to on-line monitor the brine output from the filter. If the pH of the brine is within the qualified range (for example, the preset 8.5 - 9.5), the control valve on the second output pipeline 22 is opened to transport the brine to the secondary refined brine tank 24. If the pH of the brine is too high, the control valve on the first output pipeline 21 is opened to transport the brine to the primary refined brine tank 23, and the primary refined brine in this tank will be refined again through the resin tower for the second time. By this way, the qualification of the brine in the secondary refined brine tank 24 can be ensured, thus avoiding the damage of the secondary refined brine to the subsequent ion-exchange membrane process and being beneficial to improving the service life of the ion-exchange membrane.

Claims

1. A chelating resin tower regeneration system, characterized in that, The resin tower (1) comprises a process air inlet (11) and a first wastewater outlet (12) provided at the top of the resin tower (1), a brine replacement inlet (13), an acid inlet (14) and a second wastewater outlet (15) provided at the upper side wall of the resin tower (1), and a lower port (16) provided at the bottom of the resin tower (1); The process air inlet (11) is connected to the process air input pipeline (2), the first wastewater outlet (12) and the second wastewater outlet (15) are respectively connected to the wastewater output pipeline (3), the brine replacement inlet (13) is connected to the replacement brine input pipeline (4), the acid inlet (14) is connected to the acid solution input pipeline (5), and the lower port (16) is respectively connected to the deionized water input pipeline (6), the alkali solution input pipeline (7), the replacement brine output pipeline (8) and the brine output pipeline (9); The output end of the brine output pipeline (9) is connected to a filter (10), the output end of the filter (10) is connected to the brine output pipeline (9), a pH meter (101) is provided on the brine output pipeline (9), the output end of the brine output pipeline (9) is respectively connected to a first output pipeline (21) and a second output pipeline (22), the output end of the first output pipeline (21) is connected to a primary refined brine tank (23), and the output end of the second output pipeline (22) is connected to a secondary refined brine tank (24); The first output pipeline (21) and the second output pipeline (22) are respectively provided with control valves, and the two control valves are respectively electrically connected to the pH meter (101).

2. A chelating resin tower regeneration system according to claim 1, characterized in that, The input end of the deionized water input pipeline (6) is connected to a deionized water source (28).

3. A chelating resin tower regeneration system according to claim 2, characterized in that, The deionized water source (28) is connected to the alkaline solution input pipeline (7) through another pipeline together with the alkaline solution. The deionized water source (28) is also connected to the acid solution input pipeline (5) through another pipeline together with the acid solution.

4. A chelating resin tower regeneration system according to claim 1, characterized in that, The output end of the wastewater output pipeline (3) is connected to an acidic wastewater storage tank (26) and an alkaline wastewater storage tank (27) through two pipelines respectively.

5. A chelating resin tower regeneration system according to claim 1, characterized in that, The input end of the replacement brine input pipeline (4) is connected to the secondary refined brine tank (24).

6. A chelating resin tower regeneration system according to claim 1, characterized in that, The output end of the replacement brine output pipeline (8) is connected to the brine recovery tank (25).

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