Automatic switching device for water quality analysis

Abstract

The utility model relates to water quality detection technical field, is a kind of water quality analysis automatic switching device, it includes sampling unit, water quality detection equipment, PLC controller, sampling unit import fixed communication has first desalted water inlet pipeline, second desalted water inlet pipeline, first and second desalted water delivery pump are respectively installed thereon, fixed communication has desalted water sample pipeline between sampling unit and water quality detection equipment, sampling unit includes first and second mixed bed, first and second mixed bed outlet are respectively connected with first and second water sample pipeline, first and second sampling valve are respectively fixedly arranged on first and second water sample pipeline, first desalted water delivery pump, second desalted water delivery pump, first sampling valve, second sampling valve are electrically connected with PLC controller.The utility model is reasonable and compact in structure, convenient to use, and it automatically controls the switch of sampling valve by PLC controller, ensures that mixed bed operates, and water quality detection equipment carries out real-time, effective monitoring to water quality.

Description

Technical Field

[0001] This utility model relates to the field of water quality testing technology and is an automatic switching device for water quality analysis. Background Technology

[0002] Demineralized water treatment is a technology that produces high-purity water by removing strong electrolytes (such as salts) and some weak electrolytes (such as carbon dioxide and silica). It is also known as pure water treatment or deep demineralized water treatment. Its core component, the mixed-bed ion exchanger, primarily removes trace amounts of anions and cations remaining in the water after reverse osmosis (RO) treatment, ultimately producing ultrapure water with a resistivity of 10 MΩ·cm to 18 MΩ·cm, meeting the high-precision water requirements for boiler feedwater and other applications. This process is mainly divided into two categories: traditional ion exchange and modern membrane methods. A mixed-bed ion exchanger is a water treatment device that packs anion and cation exchange resins, which are thoroughly mixed, into the same exchange column. Due to the tightly interleaved resins, it is equivalent to a combination of numerous stages of mixed beds, simultaneously and deeply removing residual anions and cations from the water. It is the core unit for producing ultra-high purity demineralized water (resistivity often reaching 18.25 MΩ·cm @ 25℃). The quality of the produced water directly determines the quality of the final product and the safe operation of key equipment (such as high-pressure boilers and semiconductor chips).

[0003] Unlike other water samples, mixed-bed permeate water samples have extremely low impurity content, placing high demands on the sensitivity and contamination resistance of the corresponding water quality testing equipment. Traditional water quality testing often uses a single device for analysis across multiple desalination units with mixed beds. When the mixed bed resin fails and needs to be switched, manual switching of the water sample to the testing device is required, which presents limitations and is prone to delays. If the water quality testing device fails to start or stop promptly when the mixed bed starts or stops, real-time monitoring of water quality changes is impossible, potentially leading to substandard desalinated water entering the production system, damaging the equipment, and disrupting its normal operation.

[0004] Therefore, it is of great significance to research and invent an automatic switching device for water quality analysis. Summary of the Invention

[0005] This utility model provides an automatic water quality analysis switching device that overcomes the shortcomings of the prior art. It can effectively solve the problem in the existing desalination production process where the water quality testing equipment is not switched in time during the mixed bed switching process, which may cause equipment damage and affect the normal production of the system.

[0006] The technical solution of this utility model is achieved through the following measures: an automatic switching device for water quality analysis, including a sampling unit, a water quality testing device, and a PLC controller. The sampling unit is fixedly connected to a first desalinated water inlet pipeline and a second desalinated water inlet pipeline. A desalinated water sample pipeline is fixedly connected between the sampling unit and the water quality testing device. Both the water quality testing device and the sampling unit are electrically connected to the PLC controller.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution: The sampling unit includes a first mixed bed, a second mixed bed, and a tee fitting. The first inlet at the bottom of the first mixed bed is fixedly connected to a first demineralized water inlet pipeline. The first inlet at the bottom of the second mixed bed is fixedly connected to a second demineralized water inlet pipeline. The first outlet at the bottom of the first mixed bed and the first outlet at the bottom of the second mixed bed are respectively provided with a first sampling tube and a second sampling tube. The bottom outlet of the first sampling tube is fixedly connected to the left inlet of the tee fitting with a first water sample pipeline. The bottom outlet of the second sampling tube is fixedly connected to the right inlet of the tee fitting with a second water sample pipeline. The bottom outlet of the tee fitting is fixedly connected to the water quality testing equipment with a demineralized water sample pipeline.

[0008] The aforementioned water quality testing equipment is a multi-parameter water quality analyzer.

[0009] The first mixed bed bottom second outlet and the second mixed bed bottom second outlet are respectively provided with a first product water pipeline and a second product water pipeline.

[0010] The first demineralized water inlet pipeline and the second demineralized water inlet pipeline are respectively fixedly installed with a first demineralized water transfer pump and a second demineralized water transfer pump.

[0011] A first sampling valve and a second sampling valve are fixedly installed on the first water sample pipeline and the second water sample pipeline, respectively.

[0012] The first demineralized water transfer pump, the second demineralized water transfer pump, the first sampling valve, and the second sampling valve are all electrically connected to the PLC controller.

[0013] This utility model features a reasonable and compact structure and is easy to use. It uses a PLC controller to automatically control the start and stop of the first and second sampling valves in conjunction with the first and second demineralized water delivery pumps, ensuring real-time and effective water quality monitoring during mixed bed operation. By implementing automatic control, the timeliness and accuracy of water quality monitoring are improved, while reducing the impact of human factors on water quality monitoring, thus enhancing the safe and stable operation of the production unit. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the process flow of this utility model.

[0015] The codes in the attached diagram are as follows: 1 is water quality testing equipment, 2 is PLC controller, 3 is the first desalinated water inlet pipeline, 4 is the second desalinated water inlet pipeline, 5 is the desalinated water sample pipeline, 6 is the first mixed bed, 7 is the second mixed bed, 8 is a tee fitting, 9 is the first sampling pipe, 10 is the second sampling pipe, 11 is the first water sample pipeline, 12 is the second water sample pipeline, 13 is the first desalinated water transfer pump, 14 is the second desalinated water transfer pump, 15 is the first sampling valve, 16 is the second sampling valve, 17 is the first product water pipeline, and 18 is the second product water pipeline. Detailed Implementation

[0016] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0017] Unless otherwise specified, all equipment and devices used in this invention are existing, publicly known, and commonly used equipment and devices in the field.

[0018] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0019] The present invention will be further described below with reference to the embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 As shown, the automatic water quality analysis switching device includes a sampling unit, a water quality testing device 1, and a PLC controller 2. The sampling unit is fixedly connected to the inlet of the first desalinated water 3 and the inlet of the second desalinated water 4. The sampling unit and the water quality testing device 1 are fixedly connected to the desalinated water sample line 5. The water quality testing device 1 and the sampling unit are both electrically connected to the PLC controller 2.

[0020] In this invention, the reverse osmosis permeate from the demineralized water reverse osmosis unit enters the sampling unit through the first demineralized water inlet pipeline 3 and the second demineralized water inlet pipeline 4, respectively. The collected water sample is sent to the water quality testing equipment 1 through the demineralized water sample pipeline 5. The PLC controller 2 automatically sends the corresponding demineralized water sample to the water quality testing equipment 1 for testing by judging the activation status of the first demineralized water inlet pipeline 3 and the second demineralized water inlet pipeline 4.

[0021] The above-mentioned automatic water quality analysis switching device can be further optimized and / or improved according to actual needs: Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1As shown, the sampling unit includes a first mixed bed 6, a second mixed bed 7, and a three-way fitting 8. The first inlet at the bottom of the first mixed bed 6 is fixedly connected to a first demineralized water inlet pipeline 3. The first inlet at the bottom of the second mixed bed 7 is fixedly connected to a second demineralized water inlet pipeline 4. The bottom of the first mixed bed 6 and the second mixed bed 7 are respectively provided with a first sampling tube 9 and a second sampling tube 10. The bottom outlet of the first sampling tube 9 is fixedly connected to the left inlet of the three-way fitting 8 with a first water sample pipeline 11. The bottom outlet of the second sampling tube 10 is fixedly connected to the right inlet of the three-way fitting 8 with a second water sample pipeline 12. The bottom outlet of the three-way fitting 8 is fixedly connected to the water quality testing equipment 1 with a demineralized water sample pipeline 5.

[0022] As needed, the first mixed bed 6 and the second mixed bed 7 serve as backups for each other. When one of the mixed beds fails and needs to be regenerated, the other backup mixed bed is activated.

[0023] As needed, the first mixed bed 6 and the second mixed bed 7 are filled with cation and anion resins. The cation and anion resins in the first mixed bed 6 and the second mixed bed 7 are uniformly mixed at a volume ratio of 1:2. When the reverse osmosis permeate flows from top to bottom through the resin layer in the first mixed bed 6 and the second mixed bed 7, three key processes occur simultaneously: the trace cations remaining in the water (such as Na) + ) and H on the cation exchange resin + Displacement, adsorbed by cation exchange resin, H + It enters the water. Trace amounts of anions (such as Cl-) remain in the water. - SiO3 2- ) with OH on the anion resin - Displacement, adsorbed by anion exchange resin, OH - It enters the water. The cation exchange resin releases H... + OH released from the anion exchange resin - Water is formed within the resin layer, and this reaction continuously lowers the H+ level in the water. + and OH - The concentration of H+ disrupts the ion exchange balance between the cation and anion resins, causing both resins to continuously release H+. + and OH - This allows for the continuous adsorption of anions and cations in the water. When the conductivity of the mixed bed product water remains below the set value (e.g., ≤0.40μS / cm) or the SiO2 content in the water exceeds the limit (e.g., 20μg / L), it indicates that the resin is saturated. The running mixed bed then stops operating and enters the regeneration stage, while the standby mixed bed is started up and put into use.

[0024] As needed, the diameter of the first sampling tube 9 and the second sampling tube 10 can be set to 6mm to 8mm.

[0025] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 1 As shown, water quality testing equipment 1 is a multi-parameter water quality analyzer.

[0026] As needed, the water quality testing equipment 1 includes a sodium analyzer, a silica analyzer, and a conductivity meter, which are known and commonly used in the art. These analyzers can detect sodium ions, SiO2, and conductivity in water, respectively. The three analyzers are integrated into the water quality testing equipment. The outlet of the desalinated water sample pipeline 5 is provided with three branch pipes, which are respectively connected to the inlets of the sodium analyzer, silica analyzer, and conductivity meter in the water quality testing equipment.

[0027] The sodium level meter can be configured with Logic=SWQ=280; the silica meter can be configured with Polymetron9610sc / SiO2; and the conductivity meter can be configured with +GF+9900.

[0028] Example 4: Its difference from Examples 1 to 3 is as follows: (See attached) Figure 1 As shown, the first product water pipeline 17 and the second product water pipeline 18 are respectively installed at the second outlet at the bottom of the first mixed bed 6 and the second outlet at the bottom of the second mixed bed 7.

[0029] As needed, the desalinated water treated by the first mixed bed 6 and the first mixed bed 7 is refined desalinated water, which is delivered to users through the first product water pipeline 17 and the second product water pipeline 18, respectively.

[0030] Example 5: It differs from Examples 1 to 4 in that, as shown in the appendix... Figure 1 As shown, a first demineralized water inlet pipeline 3 and a second demineralized water inlet pipeline 4 are respectively fixedly installed with a first demineralized water transfer pump 13 and a second demineralized water transfer pump 14.

[0031] As needed, the first demineralized water transfer pump 13 and the second demineralized water transfer pump 14 transport the upstream reverse osmosis permeate to the first mixed bed 6 and the second mixed bed 7.

[0032] Example 6: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 1 As shown, a first sampling valve 15 and a second sampling valve 16 are fixedly installed on the first water sample pipeline 11 and the second water sample pipeline 12, respectively.

[0033] As needed, when the first mixed bed 6 is put into use, its corresponding first sampling valve 15 is opened to collect the product water sample of the first mixed bed 6. The working mechanism of the second sampling valve 16 is the same as that of the first sampling valve 15.

[0034] Example 7: Its difference from Examples 1 to 6 is as follows: (See attached) Figure 1 As shown, the first demineralized water transfer pump 13, the second demineralized water transfer pump 14, the first sampling valve 15, and the second sampling valve 16 are all electrically connected to the PLC controller 2.

[0035] As needed, the first demineralized water transfer pump 13 starts, the first mixed bed 6 is put into operation, and reverse osmosis permeate enters the first mixed bed 6. When the PLC controller 2 detects the start signal of the first demineralized water transfer pump 13, it sends a command to the first sampling valve 15 and the second sampling valve 16: the second sampling valve 16 closes, the first sampling valve 15 opens, and the demineralized water sample is sent to the water quality testing equipment 1 through the demineralized water sample pipeline 5 for testing and analysis; when the second demineralized water transfer pump 14 starts, the PLC controller 2 receives a feedback signal and sends a command to close the first sampling valve 15 and open the second sampling valve 16, and the water quality testing equipment 1 tests and analyzes the permeate sample of the second mixed bed 7.

[0036] Depending on the needs, the pipelines and equipment of this automatic water quality analysis switching device can also be equipped with conventional valves, thermometers, and pressure gauges known in the art, according to production requirements. The PLC controller can be a Siemens S7-1500, and a Yokogawa CS3000 DCS control system is installed in the PLC controller 2.

[0037] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0038] The usage process of this utility model is as follows: Taking the commissioning of the first mixed bed 6 as an example, firstly, the first demineralized water delivery pump 13 is started, and at the same time, the second sampling valve 16 is closed and the first sampling valve 15 is opened. The reverse osmosis permeate enters the first mixed bed 6 through the first demineralized water inlet pipeline 3. After removing ions from the reverse osmosis permeate, refined demineralized water is obtained. Then, the refined demineralized water enters the downstream user through the first permeate pipeline 17. At the same time, a small amount of refined demineralized water flows out from the first sampling pipe 9, along the first water sample pipeline 11, through the tee fitting 8, and then through the demineralized water sample pipeline 5 into the water quality testing equipment 1. Finally, the water quality testing equipment 1 performs online real-time testing on the permeate sample of the first mixed bed 6.

Claims

1. A water quality analysis automatic switching device characterized by It includes a sampling unit, water quality testing equipment, and a PLC controller. The sampling unit is fixedly connected to a first desalinated water inlet pipeline and a second desalinated water inlet pipeline. A desalinated water sample pipeline is fixedly connected between the sampling unit and the water quality testing equipment. Both the water quality testing equipment and the sampling unit are electrically connected to the PLC controller.

2. The water quality analysis automatic switching device according to claim 1, characterized by The sampling unit includes a first mixed bed, a second mixed bed, and a three-way fitting. The first inlet at the bottom of the first mixed bed is fixedly connected to a first demineralized water inlet pipeline. The first inlet at the bottom of the second mixed bed is fixedly connected to a second demineralized water inlet pipeline. The first outlet at the bottom of the first mixed bed and the first outlet at the bottom of the second mixed bed are respectively provided with a first sampling tube and a second sampling tube. The bottom outlet of the first sampling tube is fixedly connected to the left inlet of the three-way fitting with a first water sample pipeline. The bottom outlet of the second sampling tube is fixedly connected to the right inlet of the three-way fitting with a second water sample pipeline. The bottom outlet of the three-way fitting is fixedly connected to the water quality testing equipment with a demineralized water sample pipeline.

3. The water quality analysis automatic switching device according to claim 1 or 2, characterized by The water quality testing equipment is a multi-parameter water quality monitor.

4. The water quality analysis automatic switching device according to claim 2, characterized by The first mixed bed bottom second outlet and the second mixed bed bottom second outlet are respectively equipped with a first product water pipeline and a second product water pipeline.

5. The water quality analysis automatic switching device according to claim 3, characterized by The first mixed bed bottom second outlet and the second mixed bed bottom second outlet are respectively equipped with a first product water pipeline and a second product water pipeline.

6. The water quality analysis automatic switching device according to claim 1 or 2 or 4 or 5, characterized by The first desalinated water inlet pipeline and the second desalinated water inlet pipeline are respectively fixedly installed with a first desalinated water transfer pump and a second desalinated water transfer pump.

7. The water quality analysis automatic switching device according to claim 3, characterized by The first desalinated water inlet pipeline and the second desalinated water inlet pipeline are respectively fixedly installed with a first desalinated water transfer pump and a second desalinated water transfer pump.

8. The water quality analysis automatic switching device according to claim 2 or 4 or 5 or 7, characterized by A first sampling valve and a second sampling valve are fixedly installed on the first water sample pipeline and the second water sample pipeline, respectively.

9. The water quality analysis automatic switching apparatus according to claim 6, characterized by A first sampling valve and a second sampling valve are fixedly installed on the first water sample pipeline and the second water sample pipeline, respectively.

10. The water quality analysis automatic switching device according to claim 9, characterized by The first demineralized water transfer pump, the second demineralized water transfer pump, the first sampling valve, and the second sampling valve are all electrically connected to the PLC controller.

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