On-line two-alkali concentration analysis device

Abstract

The utility model relates to a two-alkali concentration on-line analysis device which comprises a sampling unit, a sample storage container and a chromatographic analyzer, and is characterized in that the chromatographic analyzer is supported above the sample storage container, the input end of the chromatographic analyzer is connected with a vacuum pump, an inlet of the vacuum pump is connected with a negative pressure pipeline, and the free end of the negative pressure pipeline is inserted into the sample storage container; an upper liquid level meter and a lower liquid level meter are arranged in the sample storage container, the sampling unit comprises two sampling modules, and each sampling module comprises a sampling barrel, a liquid inlet pipe, a liquid outlet pipe, a filter cage suspended in the sampling barrel, a filter membrane attached to the inner side of the filter cage and a purified liquid outlet pipeline with one end located in a hollow cavity of the filter membrane; the tail ends of the purified liquid outlet pipelines of the two sampling modules are intersected and then connected with a suction / discharge pump set, and an outlet pipeline of the suction / discharge pump set is inserted into a sample storage container. The device not only plays a role in on-line monitoring, but also has high accuracy of measured data, and also can reduce the production cost, ensure the production continuity and provide real-time accurate control basis for the adding amount of the two alkalis.

Description

Technical Field

[0001] The utility model relates to the technical field of primary brine refining equipment, in particular to an online analysis device for two alkali concentrations. Background Art

[0002] The amount of alkali in the primary brine is very important. With the development of refined brine technology and the application of ceramic membrane and pre-processor-free filter membrane technology, the control requirements for the two alkalis are becoming increasingly strict. Currently, manual sampling and analysis are mainly carried out. The main problems with automatic sampling and analysis using analyzers are as follows:

[0003] 1. The brine is saturated and easily crystallizes, which can easily cause the instrument to malfunction. 2. After sodium hydroxide (NaOH) and sodium carbonate (Na2CO3) are added to the brine, calcium carbonate (CaCO3), magnesium hydroxide Mg(OH)2, and excess NaOH and Na2CO3 will be present in the brine. It is the excess NaOH and Na2CO3 that need to be monitored. If the calcium carbonate and magnesium hydroxide are not filtered out, they will consume part of the titrated hydrochloric acid, resulting in inaccurate measurement results. 3. The primary brine is coarse brine. The raw salt comes out of the salt tank and is prone to carry mud, sand, and small stones. If it enters the analyzer directly, it will cause irreparable failure of the instrument. Utility Model Content

[0004] The purpose of the utility model is to provide a two-alkali concentration online analysis device with a reasonable structure and reliable use to solve the above problems. It not only plays the role of online monitoring, but also has high accuracy of measured data, can also reduce production costs, ensure production continuity, and provide a real-time and accurate control basis for the addition amount of the two alkalis.

[0005] The technical solution of the utility model is:

[0006] A two-base concentration online analysis device includes a sampling unit, a sample storage container and a chromatographic analyzer. The technical key points are: the chromatographic analyzer is supported above the sample storage container and the input end is connected to a vacuum pump, the vacuum pump inlet is connected to a negative pressure pipeline, the free end of the negative pressure pipeline is inserted into the sample storage container, the sample storage container is provided with an upper liquid level gauge and a lower liquid level gauge, the sampling unit includes two sampling modules in parallel, each sampling module includes a sampling barrel, a liquid inlet pipe connected to the bottom of the sampling barrel, a liquid outlet pipe connected to the upper side wall of the sampling barrel, a filter cage suspended inside the sampling barrel, a filter membrane attached to the inside of the filter cage, a purified liquid outlet pipeline with one end located in the hollow cavity of the filter membrane and the other end leading out of the top of the sampling barrel, the ends of the purified liquid outlet pipelines of the two sampling modules intersect and are connected to the inlet of a suction / discharge pump group, and the outlet pipeline of the suction / discharge pump group is inserted into the sample storage container.

[0007] In the above-mentioned two-base concentration online analyzer, a magnetic stirrer is provided in the sample storage container, and a magnetic block driver is provided at the bottom of the sample storage container to rotate the magnetic stirrer to stir the liquid in the sample storage container.

[0008] The above-mentioned two-base concentration online analysis device has a titration pipeline on the top of the sample storage container, the outer end of the titration pipeline is connected to a titration pump, the input pipeline of the titration pump is inserted into the hydrochloric acid barrel, and a regulating valve is provided on the titration pipeline.

[0009] In the above-mentioned two-base concentration online analyzer, the inlets of the liquid inlet pipes of the sampling barrels of the two sampling modules are respectively provided with inlet valves, the inlet sides of the two inlet valves intersect and are connected to the outlet pipeline of the feed pump, and the outlets of the liquid outlet pipes of the sampling barrels of the two sampling modules are respectively provided with drain valves, the outlet sides of the two drain valves intersect and are connected to the drain pipeline.

[0010] In the above-mentioned two-base concentration online analysis device, the ends of the purified liquid outlet pipelines of the two sampling modules are respectively provided with control valves.

[0011] The beneficial effects of the utility model are:

[0012] 1. The crude brine is filtered through a filter membrane. The purified brine after filtration is injected into a sample storage container by a suction / discharge pump group, and then led to a chromatographic analyzer for detection and analysis by a vacuum pump. This avoids blockage of the analytical chromatogram, reduces the possibility of errors, saves production costs in disguise, ensures long-term and accurate measurement of the two alkali concentrations, and provides a real-time and accurate control basis for the addition of the two alkalis during the production process.

[0013] 2. The sample storage container is equipped with an upper and lower liquid level gauge. When the liquid level reaches the upper level gauge, the drainage pump and the suction pump in the suction / discharge pump group switch to work, draining the liquid in the sample storage container into the hollow cavity of the filter membrane to backwash the filter membrane. When the liquid level drops to the lower level gauge, the drainage stops. This backwashing extends the service life of the filter membrane.

[0014] 3. There are two sampling modules, one main and one backup. When the filter membrane of one of the sampling modules is blocked, it will switch to the backup sampling module to work, which will not affect the normal use of the device, with good working continuity and strong real-time performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 It is a structural diagram of the sampling module of the utility model.

[0017] In the figure: 1. feed pump, 2. liquid inlet valve, 3. liquid inlet pipe, 4. sampling barrel, 5. filter cage, 6. liquid outlet pipe, 7. drain valve, 8. drain pipeline, 9. purified liquid outlet pipeline, 10. control valve, 11. suction / discharge pump assembly, 12. sample storage container, 13. magnetic stirrer, 14. magnetic baffle driver, 15. negative pressure pipeline, 16. lower liquid level gauge, 17. upper liquid level gauge, 18. hydrochloric acid barrel, 19. titration pump, 20. titration pipeline, 21. regulating valve, 22. vacuum pump, 23. chromatograph, 24. filter membrane. DETAILED DESCRIPTION

[0018] The utility model is described in detail according to the accompanying drawings.

[0019] like Figure 1 、 Figure 2 As shown, the two-base concentration online analysis device includes a sampling unit, a sample storage container 12 and a chromatographic analyzer 23.

[0020] The chromatograph analyzer 23 is supported above the sample storage container 12 and its input end is connected to the vacuum pump 22. The inlet of the vacuum pump 22 is connected to the negative pressure pipeline 15, and the free end of the negative pressure pipeline 15 is inserted into the sample storage container 12. The sample storage container 12 is provided with an upper liquid level gauge 17 and a lower liquid level gauge 16.

[0021] The sampling unit comprises two sampling modules connected in parallel. Each sampling module includes a sampling barrel 4, an inlet pipe 3 connected to the bottom of the sampling barrel 4, an outlet pipe 6 connected to the upper side wall of the sampling barrel 4, a filter cage 5 suspended within the sampling barrel 4, a filter membrane 24 attached to the inner side of the filter cage 5, and a purified liquid outlet pipe 9 with one end positioned within the hollow cavity of the filter membrane 24 and the other end leading out of the top of the sampling barrel 4. In this embodiment, the inlet of the inlet pipe 3 of the sampling barrel 4 of the two sampling modules is respectively equipped with an inlet valve 2, the inlet sides of the two inlet valves 2 intersecting and connected to the outlet pipe of the feed pump 1. The outlet of the liquid outlet pipe 6 of the sampling barrel 4 of the two sampling modules is respectively equipped with a drain valve 7, the outlet sides of the two drain valves 7 intersecting and connected to the drain pipe 8. The ends of the purified liquid outlet pipes 9 of the two sampling modules intersect and are connected to the inlet of the suction / discharge pump assembly 11, the outlet pipe of which is inserted into the sample storage container 12. Control valves 10 are respectively provided at the ends of the purified liquid outlet pipelines 9 of the two sampling modules.

[0022] A magnetic stirrer 13 is provided in the sample storage container 12, and a magnetic block driver 14 is provided at the bottom of the sample storage container 12 to rotate the magnetic stirrer 13 and stir the liquid in the sample storage container 12. A titration line 20 is provided at the top of the sample storage container 12. The outer end of the titration line 20 is connected to a titration pump 19. The input line of the titration pump 19 is inserted into the hydrochloric acid barrel 18. A regulating valve 21 is provided on the titration line 20.

[0023] Working principle:

[0024] During operation, feed pump 1 introduces crude brine into sampling barrel 4, where it enters the hollow cavity of filter membrane 24, while some impurities are filtered out. The water pump in suction / discharge pump assembly 11 then draws the purified brine into sample storage container 12, where it is mixed evenly with the titrated hydrochloric acid. Vacuum pump 22 then directs the purified brine to chromatograph analyzer 23 for analysis. Two sampling modules, one active and one standby, operate as a backup. If the filter membrane 24 of one sampling module becomes clogged, the backup module switches to operation, ensuring continuous operation and strong real-time performance.

[0025] The above detailed description of the embodiments of the present invention is intended to be a preferred embodiment of the present invention and should not be construed as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made within the scope of the present invention shall still fall within the scope of this patent.

Claims

1. An online analysis device for two alkali concentrations, comprising a sampling unit, a sample storage container, and a chromatographic analyzer, characterized in that: The chromatograph analyzer is supported above the sample storage container and the input end is connected to the vacuum pump, the inlet of the vacuum pump is connected to the negative pressure pipeline, the free end of the negative pressure pipeline is inserted into the sample storage container, the sample storage container is provided with an upper liquid level gauge and a lower liquid level gauge, the sampling unit includes two sampling modules in parallel, each sampling module includes a sampling barrel, a liquid inlet pipe connected to the bottom of the sampling barrel, a liquid outlet pipe connected to the upper side wall of the sampling barrel, a filter cage suspended inside the sampling barrel, a filter membrane attached to the inside of the filter cage, a purified liquid outlet pipeline with one end located in the hollow cavity of the filter membrane and the other end leading out of the top of the sampling barrel, the ends of the purified liquid outlet pipelines of the two sampling modules intersect and are connected to the inlet of the suction / discharge pump group, and the outlet pipeline of the suction / discharge pump group is inserted into the sample storage container.

2. The two-base concentration online analyzer according to claim 1, characterized in that: A magnetic stirrer is arranged in the middle of the sample storage container, and a magnetic barrier driver is arranged at the bottom of the sample storage container.

3. The two-base concentration online analyzer according to claim 1, characterized in that: A titration pipeline is provided on the top of the sample storage container, the outer end of the titration pipeline is connected to a titration pump, an input pipeline of the titration pump is inserted into the hydrochloric acid barrel, and a regulating valve is provided on the titration pipeline.

4. The two-base concentration online analyzer according to claim 1, characterized in that: The inlet pipe inlets of the sampling barrels of the two sampling modules are respectively provided with inlet valves, the inlet sides of the two inlet valves intersect and are connected to the outlet pipeline of the feed pump, and the outlet pipe outlets of the sampling barrels of the two sampling modules are respectively provided with drain valves, the outlet sides of the two drain valves intersect and are connected to the drain pipeline.

5. The two-base concentration online analyzer according to claim 1, characterized in that: Control valves are respectively provided at the ends of the purified liquid outlet pipelines of the two sampling modules.

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