Multi-flow-path saline water double-alkali concentration on-line detection device

Abstract

The utility model discloses a multi-flow-path saline water double-alkali concentration online detection device which comprises a crude saline water sampling pipeline, a refined saline water sampling pipeline, a pure water pipeline and a double-alkali online analyzer, a micro HVM membrane filter is mounted on the crude brine sampling pipeline; the number of the sampling pipelines is one or more; a liquid outlet of each sampling pipeline is connected with a sample overflow pool; the double-alkali online analyzer comprises a sample injection pipeline, a cleaning pipeline and a waste liquid pipeline; the cleaning pipeline is connected with a pure water pipeline; the plurality of sample injection pipelines are respectively connected with the sample overflow pools; the waste liquid pipeline is connected with the salty mud tank. According to the utility model, on-line detection and detection route switching of the component content of the crude brine in the reaction tank in the primary brine process in the chemical chlor-alkali industry are realized, manual sampling analysis is replaced, the analysis efficiency of an inspection system is greatly improved, the labor cost is saved, and the process control is adjusted in time through display of on-line detection data, so that the production efficiency is improved. The unit consumption of sodium carbonate and caustic soda is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of chlor-alkali detection technology, and relates to an online detection device for dual alkali concentrations in multi-flow-path saline solution. Background Technology

[0002] In chlor-alkali production, the concentration of the two alkaline substances in brine refers to the ratio of two alkaline substances in the brine used in chemical processes such as brine refining. Controlling this concentration is crucial in actual production. For example, in the chlor-alkali industry, to remove impurities such as calcium and magnesium ions from brine, appropriate amounts of sodium hydroxide and sodium carbonate need to be added. A suitable concentration of these two alkaline substances ensures effective impurity removal while avoiding unnecessary waste of raw materials and difficulties in subsequent processing. Therefore, accurate detection of the concentration of these two alkaline substances in brine is essential for ensuring product quality and production efficiency.

[0003] Currently, the industry widely uses manual periodic sampling and testing to obtain brine alkali concentration data. This method is not only time-consuming and labor-intensive, but also has a low testing frequency, and cannot reflect the dynamic changes in brine alkali concentration in real time during the production process.

[0004] While some existing online detection devices can achieve a certain degree of automated detection, they suffer from problems such as a single flow path and poor sample pretreatment system performance. This makes it difficult to simultaneously and rapidly detect brine with multiple flow paths. Consequently, in actual production, when it is necessary to detect brine with multiple flow paths, frequent manual intervention in the detection flow path is required, which seriously affects detection efficiency and production continuity. Utility Model Content

[0005] The purpose of this invention is to provide an online detection device for dual alkali concentration in multi-flow-path saline solution, which solves the problems of single flow path and inaccurate detection in the existing technology.

[0006] The technical solution adopted in this utility model is a multi-flow-path saline dual-alkali concentration online detection device, including a crude saline sampling pipeline, a refined saline sampling pipeline, a pure water pipeline, and a dual-alkali online analyzer; the crude saline sampling pipeline is equipped with a fluoropolymer-lined ball valve and a miniature Kelvin membrane filter; there are one or more crude saline sampling pipelines and refined saline sampling pipelines; the outlet of each crude saline sampling pipeline and refined saline sampling pipeline is connected to a sample overflow pool; the dual-alkali online analyzer includes an inlet pipeline, a cleaning pipeline, and a waste liquid pipeline; the cleaning pipeline is connected to the pure water pipeline; there are multiple inlet pipelines, each connected to a separate sample overflow pool; the waste liquid pipeline is connected to a salt mud pool.

[0007] The features of this utility model also include:

[0008] The miniature Kelvin membrane filter includes a tank and a Kelvin membrane filter element; the tank is hollow inside and open at the top; a tube sheet is fixedly installed on the top of the Kelvin membrane filter element, and the outer dimensions of the tube sheet are larger than the size of the opening at the top of the tank; the Kelvin membrane filter element extends into the tank from the top, and the tube sheet is clamped at the opening at the top of the tank.

[0009] There is a liquid inlet at the lower end of the side wall of the tank, which is connected to the crude brine sampling pipeline.

[0010] The upper part of the side wall of the tank has a sample overflow port, a sample recovery port and an exhaust port, and the bottom of the tank has a funnel-shaped drain port.

[0011] The sample overflow port is the outlet of the micro-Kai membrane filter, and the outlet is connected to the coarse brine sampling pipeline.

[0012] The sample recovery port is connected to the brine intermediate tank via a pipe.

[0013] Install a sample inlet switching valve on the sample inlet line.

[0014] The sample switching valve includes solenoid valves installed on different sample injection lines.

[0015] The beneficial effects of this utility model are:

[0016] This invention enables online detection and switching of detection routes for the content of crude brine components in the reaction tank during the primary brine process in the chemical chlor-alkali industry. It replaces manual sampling and analysis, significantly improving the analysis efficiency of the testing system, saving labor costs, and allowing timely adjustments to process control through the display of online detection data, thereby reducing the unit consumption of soda ash and caustic soda. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the detection process of the multi-flow-path saline dual-alkali concentration online detection device of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the miniature Kelp membrane filter inside the multi-flow-path saline dual-alkali concentration online detection device of this utility model;

[0019] Figure 3 This is a schematic diagram of the panel of the dual-alkali online analyzer in the multi-flow-path saline dual-alkali concentration online detection device of this utility model.

[0020] In the diagram, 1. Coarse brine sampling pipeline, 2. Fine brine sampling pipeline, 3. Pure water pipeline, 4. Fluorine-lined ball valve, 5. Miniature Kelp membrane filter, 6. Sample overflow tank, 7. Dual alkali online analyzer, 8. Salt mud tank, 9. Brine intermediate tank;

[0021] 501. Tank body, 502. Membrane filter element, 503. Tube sheet, 504. Liquid inlet, 505. Sample overflow outlet, 506. Sample recovery outlet, 507. Exhaust outlet, 508. Drain outlet;

[0022] 701. Sample inlet switching valve; 702. Sampling peristaltic pump device; 703. Titration cup; 704. Burette; 705. Waste liquid discharge peristaltic pump device; 706. Stirring device. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 As shown, this utility model provides a multi-flow-path brine dual-alkali concentration online detection device, including a crude brine sampling pipeline 1, a refined brine sampling pipeline 2, a pure water pipeline 3, and a dual-alkali online analyzer 7; the crude brine sampling pipeline 1 is equipped with a fluoropolymer-lined ball valve 4 and a miniature Kelvin membrane filter 5;

[0025] There is one or more crude saline sampling lines 1 and refined saline sampling lines 2; the outlet of each crude saline sampling line 1 and refined saline sampling line 2 is connected to a sample overflow pool 6.

[0026] The dual-alkali online analyzer 7 includes a sample inlet line, a cleaning line, and a waste liquid line;

[0027] The cleaning pipeline is connected to the pure water pipeline 3; there are multiple sample inlet pipelines, which are connected to the overflow pools of each sample respectively 6; the waste liquid pipeline is connected to the salt mud pool 8.

[0028] like Figure 2 As shown, the miniature Kelvin membrane filter 5 includes a tank 501 and a Kelvin membrane filter element 502; the tank 501 is hollow inside and open at the top; a tube sheet 503 is fixedly installed on the top of the Kelvin membrane filter element 502, and the outer dimensions of the tube sheet 503 are larger than the size of the opening at the top of the tank 501; the Kelvin membrane filter element 502 extends into the tank 501 from the top, and the tube sheet 503 is clamped at the opening at the top of the tank 501.

[0029] The lower end of the side wall of tank 501 has a liquid inlet 504, which is connected to the crude brine sampling pipeline 1.

[0030] The upper end of the side wall of the tank 501 has a sample overflow port 505, a sample recovery port 506 and an exhaust port 507, and the bottom of the tank has a funnel-shaped drain port 508.

[0031] The sample overflow port 505 is the outlet of the micro membrane filter 5, which is connected to the coarse brine sampling pipeline 1.

[0032] The sample recovery port 506 is connected to the brine intermediate tank 9 via a pipe.

[0033] The crude brine flows through the crude brine sampling line 1 into the inlet of the micro membrane filter 5. After filtration, it flows back into the crude brine sampling line 1 from the outlet and finally into the sample overflow pool 6.

[0034] The miniature Kelvin membrane filter 5 is used to filter out substances such as calcium carbonate that affect the accuracy of detection in crude brine, eliminating interfering substances, ensuring sample representativeness, and making analytical data accurate. The miniature Kelvin membrane filter 5 utilizes the filtration characteristics of a Kelvin membrane (a type of high-molecular-weight organic synthetic membrane). Driven by pressure difference, solid impurities in the brine are trapped on the membrane surface as it passes through the Kelvin membrane, while refined brine permeates through the membrane to subsequent processes, thus achieving solid-liquid separation and brine purification. The tank 501 is made of titanium, which is resistant to brine corrosion, has a large filtration area, and high filtration accuracy. This high filtration accuracy effectively removes suspended solids, organic matter, calcium carbonate, and other impurities from the brine, eliminating the influence of impurities on detection.

[0035] like Figure 3 As shown, an injection switching valve 701 is installed on the injection pipeline of the dual alkali online analyzer 7. The injection switching valve 701 controls the connection and disconnection of different injection pipelines, and introduces the samples from the overflow cells 6 of different samples into the analysis unit of the dual alkali online analyzer 7 in a set order for sample analysis.

[0036] The working principle of this multi-flow-path brine dual-alkali concentration online detection device is as follows:

[0037] The crude brine flows into the micro membrane filter 5 through the crude brine sampling pipeline 1 for filtration. A portion of the refined brine obtained after filtration flows into the corresponding sample overflow pool 6 to ensure continuous sample flow and representativeness. The remaining refined brine after filtration flows into the brine intermediate tank 9 for reuse.

[0038] The refined saline solution flows directly into the corresponding sample overflow tank 6 through the refined saline solution sampling pipeline 2;

[0039] Pure water flows into the cleaning pipeline of the dual alkali online analyzer 7 through the pure water pipeline 3, and is used for cleaning the dual alkali online analyzer 7 after each test.

[0040] Samples from multiple sample overflow pools 6 flow into the sample inlet pipeline of the dual-alkali online analyzer 7. Different samples are sequentially switched for testing via the sample inlet switching valve 701 on the sample inlet pipeline to obtain the sodium hydroxide and sodium carbonate content in the brine. The results are displayed on the instrument screen. The waste liquid after the test is completed is discharged into the salt mud pool 8.

[0041] Example 1

[0042] In this embodiment, the multi-flow-path saline dual-alkali concentration online detection device includes a crude saline sampling pipeline 1, a refined saline sampling pipeline 2, a pure water pipeline 3, and a dual-alkali online analyzer 7; the crude saline sampling pipeline 1 is equipped with a fluoropolymer-lined ball valve 4 and a miniature Kelvin membrane filter 5;

[0043] There is one or more crude saline sampling lines 1 and refined saline sampling lines 2; the outlet of each crude saline sampling line 1 and refined saline sampling line 2 is connected to a sample overflow pool 6.

[0044] The dual-alkali online analyzer 7 includes a sample inlet line, a cleaning line, and a waste liquid line;

[0045] The cleaning pipeline is connected to the pure water pipeline 3; there are multiple sample inlet pipelines, which are connected to the overflow pools of each sample respectively 6; the waste liquid pipeline is connected to the salt mud pool 8.

[0046] Example 2

[0047] In this embodiment, the multi-flow-path saline dual-alkali concentration online detection device includes a crude saline sampling pipeline 1, a refined saline sampling pipeline 2, a pure water pipeline 3, and a dual-alkali online analyzer 7; the crude saline sampling pipeline 1 is equipped with a fluoropolymer-lined ball valve 4 and a miniature Kelvin membrane filter 5;

[0048] There is one or more crude saline sampling lines 1 and refined saline sampling lines 2; the outlet of each crude saline sampling line 1 and refined saline sampling line 2 is connected to a sample overflow pool 6.

[0049] The dual-alkali online analyzer 7 includes a sample inlet line, a cleaning line, and a waste liquid line;

[0050] The cleaning pipeline is connected to the pure water pipeline 3; there are multiple sample inlet pipelines, which are connected to the overflow pools of each sample respectively 6; the waste liquid pipeline is connected to the salt mud pool 8.

[0051] The miniature Kelvin membrane filter 5 includes a tank 501 and a Kelvin membrane filter element 502; the tank 501 is hollow inside and open at the top; a tube sheet 503 is fixedly installed on the top of the Kelvin membrane filter element 502, and the outer dimensions of the tube sheet 503 are larger than the size of the opening at the top of the tank 501; the Kelvin membrane filter element 502 extends into the tank 501 from the top, and the tube sheet 503 is clamped at the opening at the top of the tank 501.

[0052] The lower end of the side wall of tank 501 has a liquid inlet 504, which is connected to the crude brine sampling pipeline 1.

[0053] The upper end of the side wall of the tank 501 has a sample overflow port 505, a sample recovery port 506 and an exhaust port 507, and the bottom of the tank has a funnel-shaped drain port 508.

[0054] The sample overflow port 505 is the outlet of the micro membrane filter 5, which is connected to the coarse brine sampling pipeline 1.

[0055] The sample recovery port 506 and the exhaust port 507 are connected to the brine intermediate tank 9 via pipes.

[0056] In use, the coarse brine flows into the inlet 504 of the micro membrane filter 5 through the coarse brine sampling pipeline 1. After being filtered by the membrane filter element 502, part of the filtered refined brine flows back to the coarse brine sampling pipeline 1 from the sample overflow port 505 and then flows into the sample overflow pool 6. The other part of the filtered refined brine flows into the brine intermediate tank 9 from the sample recovery port 506 for later use. The exhaust port 507 is used to regulate the air pressure in the filter chamber, and the drain port 508 is opened periodically to clean the filtered solid impurities.

[0057] Example 3

[0058] In this embodiment, the multi-flow-path saline dual-alkali concentration online detection device includes a crude saline sampling pipeline 1, a refined saline sampling pipeline 2, a pure water pipeline 3, and a dual-alkali online analyzer 7; the crude saline sampling pipeline 1 is equipped with a fluoropolymer-lined ball valve 4 and a miniature Kelvin membrane filter 5;

[0059] There is one or more crude saline sampling lines 1 and refined saline sampling lines 2; the outlet of each crude saline sampling line 1 and refined saline sampling line 2 is connected to a sample overflow pool 6.

[0060] The dual-alkali online analyzer 7 includes a sample inlet line, a cleaning line, and a waste liquid line;

[0061] The cleaning pipeline is connected to the pure water pipeline 3; there are multiple sample inlet pipelines, which are connected to the overflow pools of each sample respectively 6; the waste liquid pipeline is connected to the salt mud pool 8.

[0062] The miniature Kelvin membrane filter 5 includes a tank 501 and a Kelvin membrane filter element 502; the tank 501 is hollow inside and open at the top; a tube sheet 503 is fixedly installed on the top of the Kelvin membrane filter element 502, and the outer dimensions of the tube sheet 503 are larger than the size of the opening at the top of the tank 501; the Kelvin membrane filter element 502 extends into the tank 501 from the top, and the tube sheet 503 is clamped at the opening at the top of the tank 501.

[0063] The lower end of the side wall of tank 501 has a liquid inlet 504, which is connected to the crude brine sampling pipeline 1.

[0064] The upper end of the side wall of the tank 501 has a sample overflow port 505, a sample recovery port 506 and an exhaust port 507, and the bottom of the tank has a funnel-shaped drain port 508.

[0065] The sample overflow port 505 is the outlet of the micro membrane filter 5, which is connected to the coarse brine sampling pipeline 1.

[0066] The sample recovery port 506 and the exhaust port 507 are connected to the brine intermediate tank 9 via pipes.

[0067] The Kai membrane filter element 502 consists of 9 membrane tubes installed inside the tank, providing a large filtration area and high filtration accuracy.

[0068] Example 4

[0069] In this embodiment, the multi-flow-path saline dual-alkali concentration online detection device includes a crude saline sampling pipeline 1, a refined saline sampling pipeline 2, a pure water pipeline 3, and a dual-alkali online analyzer 7; the crude saline sampling pipeline 1 is equipped with a fluoropolymer-lined ball valve 4 and a miniature Kelvin membrane filter 5;

[0070] There is one or more crude saline sampling lines 1 and refined saline sampling lines 2; the outlet of each crude saline sampling line 1 and refined saline sampling line 2 is connected to a sample overflow pool 6.

[0071] The dual-alkali online analyzer 7 includes a sample inlet line, a cleaning line, and a waste liquid line;

[0072] The cleaning pipeline is connected to the pure water pipeline 3; there are multiple sample inlet pipelines, which are connected to the overflow pools of each sample respectively 6; the waste liquid pipeline is connected to the salt mud pool 8.

[0073] Install a sample inlet switching valve 701 on the sample inlet pipeline.

[0074] A sample switching valve is a widely used device in analytical instruments and some chemical experiments and industrial processes. It is mainly used to control sample introduction and mobile phase switching. A sample switching valve generally consists of a valve body, a valve core, a drive mechanism, and connecting pipe interfaces. The valve body is usually made of corrosion-resistant and high-pressure-resistant materials. The valve core can change position within the valve body by rotation or sliding, thereby achieving the switching of different flow paths.

[0075] Example 5

[0076] In this embodiment, the multi-flow-path saline dual-alkali concentration online detection device includes a crude saline sampling pipeline 1, a refined saline sampling pipeline 2, a pure water pipeline 3, and a dual-alkali online analyzer 7; the crude saline sampling pipeline 1 is equipped with a fluoropolymer-lined ball valve 4 and a miniature Kelvin membrane filter 5;

[0077] There is one or more crude saline sampling lines 1 and refined saline sampling lines 2; the outlet of each crude saline sampling line 1 and refined saline sampling line 2 is connected to a sample overflow pool 6.

[0078] The dual-alkali online analyzer 7 includes a sample inlet line, a cleaning line, and a waste liquid line;

[0079] The cleaning pipeline is connected to the pure water pipeline 3; there are multiple sample inlet pipelines, which are connected to the overflow pools of each sample respectively 6; the waste liquid pipeline is connected to the salt mud pool 8.

[0080] A sample injection line switching device is installed on the sample injection line. Each sample injection line is connected to a different titration cup 703. The sample injection line switching device includes a solenoid valve installed on each sample injection line.

[0081] At a certain moment, the solenoid valve of the first sample path is opened, allowing the saline sample in that path to enter the dual-alkali online analyzer 7 for dual-alkali analysis. After the analysis is completed, the first solenoid valve is closed, and the second solenoid valve is opened to analyze the next sample path, and so on, to achieve the alternating analysis of multiple sample paths.

[0082] The sampling peristaltic pump device 702 quantitatively extracts samples, allowing samples from different flow paths to flow sequentially into the corresponding titration cups 703; the hydrochloric acid standard solution for analysis is automatically pumped into the burette 704 through the reagent tubing, and the reagent is dripped into the titration cup 703 using the burette 704; a stirring device 706 is installed at the titration cup 703, and the start and stop of the stirring device can be customized according to the needs throughout the titration process; finally, the sample is analyzed and tested.

[0083] Each titration cup 703 and burette 704 is connected to a waste liquid discharge peristaltic pump device 705 via a pipeline. The waste liquid after testing is discharged to the salt mud tank 8 through the waste liquid discharge peristaltic pump device 705.

[0084] Samples can be tested simultaneously in multiple titration cups 703, improving testing efficiency.

[0085] Example 6

[0086] In this embodiment, the multi-flow-path saline dual-alkali concentration online detection device includes a crude saline sampling pipeline 1, a refined saline sampling pipeline 2, a pure water pipeline 3, and a dual-alkali online analyzer 7; the crude saline sampling pipeline 1 is equipped with a fluoropolymer-lined ball valve 4 and a miniature Kelvin membrane filter 5;

[0087] There is one or more crude saline sampling lines 1 and refined saline sampling lines 2; the outlet of each crude saline sampling line 1 and refined saline sampling line 2 is connected to a sample overflow pool 6.

[0088] The dual-alkali online analyzer 7 includes a sample inlet line, a cleaning line, and a waste liquid line;

[0089] The cleaning pipeline is connected to the pure water pipeline 3; there are multiple sample inlet pipelines, which are connected to the overflow pools of each sample respectively 6; the waste liquid pipeline is connected to the salt mud pool 8.

[0090] The sample inlet switching valve 701 is installed on the sample inlet line of the dual alkali online analyzer 7. The sample inlet switching valve 701 is program-controlled.

[0091] After the dual-alkali online analyzer completes the test and obtains the results, they are displayed on the screen and simultaneously transmitted to the DCS control room via digital signals.

[0092] The waste liquid obtained after analysis by the dual alkali online analyzer 7 is pumped out by the waste liquid discharge peristaltic pump device 705 and discharged into the salt mud pond 8 for recycling and further treatment.

[0093] The system software in the dual-alkali online analyzer 7 allows users to set analytical parameters, such as the analysis cycle and switching time interval for each flow path. Simultaneously, the system software coordinates the operation between the multi-flow path solenoid valves and the analytical unit, ensuring automation and high efficiency throughout the entire analytical process.

Claims

1. A multi-flow-path brine dual-alkali concentration online detection device, characterized in that, It includes a crude brine sampling pipeline (1), a refined brine sampling pipeline (2), a pure water pipeline (3), and a dual-alkali online analyzer (7); the crude brine sampling pipeline (1) is equipped with a fluoropolymer-lined ball valve (4) and a miniature Kelvin membrane filter (5); The crude saline sampling pipeline (1) and the refined saline sampling pipeline (2) are one or more; the outlet of each crude saline sampling pipeline (1) and the refined saline sampling pipeline (2) is connected to a sample overflow pool (6). The dual-alkali online analyzer (7) includes an injection line, a cleaning line, and a waste liquid line; The cleaning pipeline is connected to the pure water pipeline (3); there are multiple sample inlet pipelines, which are respectively connected to each sample overflow pool (6); the waste liquid pipeline is connected to the salt mud pool (8).

2. The multi-flow-path brine dual-alkali concentration online detection device according to claim 1, characterized in that, The micro membrane filter (5) includes a tank (501), a membrane filter element (502), and a tube sheet (503) fixed to the top of the membrane filter element (502).

3. The multi-flow-path brine dual-alkali concentration online detection device according to claim 2, characterized in that, The tank (501) is hollow inside and open at the top; the membrane filter element (502) extends into the tank (501) from the top and the tube sheet (503) is stuck at the opening at the top of the tank (501).

4. The multi-flow-path brine dual-alkali concentration online detection device according to claim 2, characterized in that, The lower end of the side wall of the tank (501) has a liquid inlet (504), which is connected to the crude brine sampling pipeline (1).

5. The multi-flow-path brine dual-alkali concentration online detection device according to claim 2, characterized in that, The upper end of the side wall of the tank (501) has a sample overflow port (505), a sample recovery port (506) and an exhaust port (507), and the bottom of the tank (501) has a funnel-shaped drain port (508).

6. The multi-flow-path brine dual-alkali concentration online detection device according to claim 5, characterized in that, The sample overflow port (505) is connected to the coarse brine sampling pipeline (1).

7. The multi-flow-path brine dual-alkali concentration online detection device according to claim 5, characterized in that, The sample recovery port (506) and the exhaust port (507) are connected to the brine intermediate tank (9) via pipes.

8. The multi-flow-path brine dual-alkali concentration online detection device according to claim 1, characterized in that, An injection switching valve (701) is installed on the injection pipeline.

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