An on-line chemical instrument testing device

Abstract

The utility model provides a kind of online chemical instrument testing device, including degassing unit, cation exchange column and electrode detection unit;Degassing unit includes total water inlet for being connected with water vapor sampling place and multiple flow-through paths, at least one flow-through path can be communicated with outside, for discharging or shunting water sample, at least one flow-through path can be communicated with cation exchange column, cation exchange column is communicated with electrode detection unit.In need to replace different water sample to detect, by the on-off of the multiple flow-through paths of degassing unit, the water sample that possibly carries air that enters degassing unit in initial stage is discharged or shunted, avoid bubble into cation exchange column, further avoid bubble interference subsequent ion exchange efficiency and the accuracy of electrode detection unit detection hydrogen conductivity, make the data of the hydrogen conductivity of detection real and reliable, and method is simple, can be used for the regular inspection of online chemical instrument accuracy.

Description

Technical Field

[0001] This utility model relates to the field of chemical instrumentation technology, and in particular to an online chemical instrumentation testing device. Background Technology

[0002] Online chemical instruments are a core means of monitoring and controlling the chemical properties of water and steam in power plants. Their measurement accuracy directly affects the safe operation of the power plant and is a powerful guarantee against sudden damage to thermal equipment. Online chemical instrument testing devices are used to verify the accuracy of online chemical instruments. The main method is to simulate actual operating conditions by injecting a test solution. Its components include sampling pipelines, ion exchange resin columns (cation exchange resin and mixed ion exchange resin), conductivity electrodes, pH electrodes, dissolved oxygen electrodes, standard solution addition systems, and related circuitry.

[0003] Currently, hydrogen conductivity, as a key indicator of water-vapor systems, can sensitively reflect the content of anionic impurities (such as Cl⁻ and SO₄²⁻) in the system and is an important basis for assessing system corrosion risk. In existing technologies, when using online chemical instrumentation testing devices to test hydrogen conductivity, the system's water path must first be switched to the cation exchange column within the device to remove cations from the water sample, ensuring that the hydrogen conductivity measurement only reflects the influence of anionic impurities.

[0004] However, existing online chemical instrument testing devices are prone to air ingress into the water sample during water circuit switching, generating air bubbles that accumulate inside the cation exchange column, creating air resistance. This not only prolongs the water sample replacement time and reduces detection efficiency but may also interfere with the stability and accuracy of hydrogen conductivity measurements due to air bubbles adhering to the cation exchange column surface or electrodes. While venting methods rely solely on opening the upper switch of the cation exchange column to flush out air bubbles using water flow, this approach still has significant drawbacks in practical applications: First, venting efficiency is low, and air bubbles are difficult to completely remove with water flow. This means that residual air bubbles adhering to the cation exchange column may be suddenly released during the test, causing fluctuations in conductivity readings and affecting the reliability of the test results. Second, the need to repeatedly open and close the valve and observe the air bubble discharge further prolongs the detection time. Utility Model Content

[0005] In view of the shortcomings of the prior art mentioned in the background section, this utility model proposes an online chemical instrument testing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An online chemical instrument testing device includes a degassing unit, a cation exchange column, and an electrode detection unit. The degassing unit includes a main inlet for connection to a water vapor sampling point and multiple flow paths, at least one of which is connected to the outside for discharging or diverting water samples. At least one of the flow paths is connected to the cation exchange column, and the cation exchange column is connected to the electrode detection unit.

[0008] Furthermore, the flow path includes a first flow path connecting the main inlet and the outside, and a first valve is provided on the first flow path, which is a flow regulating valve.

[0009] Furthermore, a first flow meter is also provided on the first flow path, and the first flow meter is located on the side of the first valve away from the outside.

[0010] Furthermore, the flow path includes a second flow path connecting the main inlet and the cation exchange column, and a second valve is provided on the second flow path, which is an on / off valve or a flow regulating valve.

[0011] Furthermore, a second flow meter is also provided on the second flow path, and the second flow meter is located between the second valve and the cation exchange column.

[0012] Furthermore, the second flow path is also provided with a third valve, which is located upstream of the second valve, and the third valve is an on / off valve or a flow regulating valve;

[0013] The flow path also includes a third flow path, on which a fourth valve is provided. The fourth valve is an on / off valve. The connection between the third flow path and the second flow path is located between the second valve and the third valve, and the other end of the third flow path is connected to the outside.

[0014] Furthermore, the inlet of the cation exchange column is located below the cation exchange column, and the outlet of the cation exchange column is located above the cation exchange column.

[0015] Furthermore, the electrode detection unit includes an electrode and an electrode cell, the inlet of the electrode cell is connected to the outlet of the cation exchange column, and the electrode is used to detect the water sample entering the electrode cell;

[0016] The outlet of the electrode pool is connected to the outside.

[0017] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0018] This invention provides an online chemical instrument testing device, comprising a degassing unit, a cation exchange column, and an electrode detection unit. The degassing unit includes a main inlet for connection to a water vapor sampling point and multiple flow paths. At least one flow path is connected to the outside environment for discharging or diverting water samples. At least one flow path is connected to the cation exchange column, which receives bubble-free water samples and removes cations from them. The cation exchange column is connected to the electrode detection unit, which detects the hydrogen conductivity of the cation-free water sample. When different water samples need to be tested, the multiple flow paths of the degassing unit are switched on and off to discharge or divert water samples that may initially carry air. Once the water sample stabilizes and is bubble-free, the flow path connected to the cation exchange column is switched to transport the water sample, preventing air bubbles from entering the cation exchange column. This avoids air bubbles interfering with subsequent ion exchange efficiency and the accuracy of the hydrogen conductivity detection by the electrode detection unit, ensuring the reliability of the detected hydrogen conductivity data. The method is simple and can be used for periodic verification of the accuracy of online chemical instruments. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an online instrument testing device provided in one embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of an online instrument testing device provided in another embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Degassing unit; 11. First flow path; 111. First valve; 112. First flow meter; 12. Second flow path; 121. Second valve; 122. Second flow meter; 123. Third valve; 13. Third flow path; 131. Fourth valve; 132. Third flow meter; 14. Main inlet;

[0024] 2. Cation exchange column;

[0025] 3. Electrode detection unit; 31. Electrode; 32. Electrode cell;

[0026] 4. Water vapor sampling point. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] As attached Figure 1 and attached Figure 2 As shown, an online chemical instrument testing device includes a degassing unit 1, a cation exchange column 2, and an electrode detection unit 3. The degassing unit 1 includes a main inlet 14 for connection to a water vapor sampling point 4 and multiple flow paths. At least one flow path is connected to the outside environment for discharging or diverting water samples. At least one flow path is connected to the cation exchange column 2, which receives bubble-free water samples and removes cations from them. The cation exchange column 2 is connected to the electrode detection unit 3, which detects the hydrogen conductivity of the cation-free water sample. Finally, the accuracy of the online chemical instrument is determined by comparing the hydrogen conductivity data obtained from the online chemical instrument testing device with that obtained from the online chemical instrument testing.

[0031] Specifically, in some embodiments, the degassing unit 1 can be configured with multiple flow paths that can be switched on or off. When the online chemical instrument testing device needs to change to different water samples for testing, the water sample that initially enters the degassing unit 1 and may carry air is first switched or diverted to a flow path connected to the outside for discharge. After the water sample stabilizes and is free of air bubbles, it is switched back to the flow path connected to the cation exchange column 2, allowing the stabilized water sample to enter the cation exchange column 2, thus preventing the water sample entering the cation exchange column 2 from carrying air bubbles. In other embodiments, the degassing unit 1 can be configured with multiple flow paths with adjustable flow rates. When the online chemical instrument testing device needs to change to different water samples for testing, the flow path can be switched on or diverted to a flow path connected to the outside for discharge. When the sample is being tested, the flow rate of the water sample in the path connected to the cation exchange column 2 is first reduced, so that most of the unstable water sample initially entering the degassing unit 1 is discharged from the path with a larger flow rate that is connected to the outside. After the water sample flow rate stabilizes, the flow rate of the water sample in the path connected to the cation exchange column 2 is increased, so that the stabilized water sample enters the cation exchange column 2, avoiding the water sample entering the cation exchange column 2 from carrying air bubbles. Alternatively, in other embodiments, the degassing unit 1 can be a combination of switching and diversion, which can both quickly stabilize the water sample and allow it to enter the cation exchange column 2, and dynamically adjust the flow rate to avoid the water sample entering the cation exchange column 2 from carrying air bubbles.

[0032] It is worth noting that when the flow path is used for discharging or diverting water samples, it can be controlled by valves such as on / off valves, flow regulating valves, pressure reducing valves, and three-way valves, or by pumps such as variable frequency speed control centrifugal pumps. Alternatively, when the flow path is a flexible pipe, it can be controlled by clamp valves, flexible pipe clamps, or peristaltic pumps. Users can choose according to the actual use of the product and quality requirements, and there are no restrictions here.

[0033] This utility model's online chemical instrument testing device, when requiring different water samples for testing, uses the switching of multiple flow paths in the degassing unit 1 to discharge or divert water samples that initially enter the degassing unit 1 and may carry air. Once the water sample stabilizes and is free of bubbles, the flow path connected to the cation exchange column 2 is switched to transport the water sample, preventing bubbles from entering the cation exchange column 2. This avoids bubbles interfering with the subsequent ion exchange efficiency and the accuracy of the hydrogen conductivity detection by the electrode detection unit 3, ensuring the hydrogen conductivity data is accurate and reliable. The method is simple and can be used for the periodic verification of the accuracy of online chemical instruments.

[0034] In some embodiments of this utility model, as shown in the appendix Figure 1 and attached Figure 2As shown, the flow path includes a first flow path 11 connecting the main inlet 14 and the outside. A first valve 111 is installed on the first flow path 11, which is a flow regulating valve. By controlling the valve between the first flow path 11 and the flow path connecting to the cation exchange column 2, the water sample that initially enters the degassing unit 1 and may carry air is discharged or diverted. After the water sample flow rate stabilizes, the flow path connecting to the cation exchange column 2 is connected again, or the water sample flow rate of the flow path connecting to the cation exchange column 2 is increased, so that the stabilized, bubble-free water sample enters the cation exchange column 2.

[0035] In some embodiments of this utility model, as shown in the appendix Figure 1 and attached Figure 2 As shown, a first flow meter 112 is also provided on the first flow path 11. The first flow meter 112 is located on the side of the first valve 111 away from the outside. After the water sample flow rate of the first flow path 11 stabilizes, the first flow meter 112 is opened and the subsequent water sample flow rate entering the first valve 111 is known by the value displayed by it.

[0036] In some embodiments of this utility model, as shown in the appendix Figure 1 and attached Figure 2 As shown, the flow path includes a second flow path 12 connecting the main inlet 14 and the cation exchange column 2. This second flow path 12 receives water samples after the air bubbles have been expelled, preventing water samples entering the cation exchange column 2 from carrying air bubbles. A second valve 121 is provided on the second flow path 12. The second valve 121 is an on / off valve or a flow regulating valve, used to open after water samples that may carry air and have entered the degassing unit 1 during the initial flow of water samples that have been discharged from or diverted through the flow path connected to the outside environment, and are then connected to the main inlet 14 and the cation exchange column 2.

[0037] In some embodiments of this utility model, as shown in the appendix Figure 1 and attached Figure 2 As shown, a second flow meter 122 is also provided on the second flow path 12. The second flow meter 122 is located between the second valve 121 and the cation exchange column 2, and is used to detect the flow rate of the water sample entering the cation exchange column 2 and the electrode detection unit 3. When the inlet water requirements of both are not met, the opening of the second valve 121 (when the second valve 121 is a flow regulating valve) is dynamically adjusted according to the value displayed by the second flow meter 122, or the flow rate of the water sample in the flow path that is connected to the outside and plays a diversion role (when the second valve 121 is an on / off valve). Preferably, the detection conditions of the electrode detection unit 3 are 250-350 mL / min.

[0038] In some embodiments of this utility model, as shown in the appendix Figure 1As shown, in order to accurately regulate the flow rate of water samples entering the cation exchange column 2 and electrode detection unit 3, the second flow path 12 is also provided with a third valve 123. The third valve 123 is located upstream of the second valve 121, and the third valve 123 is an on / off valve or a flow regulating valve. The flow path also includes a third flow path 13, on which a fourth valve 131 is provided. The fourth valve 131 is an on / off valve. The connection between the third flow path 13 and the second flow path 12 is located between the second valve 121 and the third valve 123, and the other end of the third flow path 13 is connected to the outside to discharge the water sample that initially enters the degassing unit 1 and may carry air. Preferably, the third flow path 13 is also provided with a third flow meter 132, which is located upstream of the fourth valve 131.

[0039] It is worth noting that the various embodiments and features described above can be combined with each other to form other embodiments not shown in the above description.

[0040] In some embodiments of this invention, because the conventional cation exchange column 2 uses a top-inlet and bottom-outlet water inlet method, gas accumulates at the top of the cation exchange column 2 during the water inlet process, generating bubbles. In this situation, the only solution is to open the top switch and allow the water sample to carry the bubbles out. However, during the experiment, when bubbles adhere to the cation exchange column 2, the low flow rate of the water sample makes it difficult for the bubbles to escape. Therefore, as shown in the attached... Figure 1 and attached Figure 2 As shown, in this application, the inlet of the cation exchange column 2 is located at the bottom of the cation exchange column 2, and the outlet of the cation exchange column 2 is located at the top of the cation exchange column 2. When a bubble-free water sample enters the cation exchange column 2, the water sample flows in a bottom-in, top-out direction, effectively avoiding the aforementioned problems. Furthermore, due to the absence of gravity, the contact time of the bubble-free water sample within the cation exchange column 2 is extended, facilitating more comprehensive removal of cations from the water sample.

[0041] In some embodiments of this utility model, as shown in the appendix Figure 1 and attached Figure 2 As shown, the electrode detection unit 3 includes an electrode 31 and an electrode cell 32. The inlet of the electrode cell 32 is connected to the outlet of the cation exchange column 2. The water sample without bubbles and with cations removed, delivered from the cation exchange column 2, gradually fills the electrode cell 32. The electrode 31 then begins to detect the water sample entering the electrode cell 32. The outlet of the electrode cell 32 is connected to the outside, meaning that the detected water sample is discharged to the outside, such as through a drainage collection device. This ensures that the water sample to be tested in the electrode cell 32 is always in dynamic flow, improving the detection accuracy of hydrogen conductivity.

[0042] Specifically, as shown in the attached document Figure 1As shown, the specific usage of the online chemical instrument testing device according to one embodiment of this utility model application is as follows: First, open and increase the valve degree of the first valve 111, close the second valve 121, the third valve 123 and the fourth valve 131, and connect the water sample to be tested from the water vapor sampling point 4 to the main inlet 14. At this time, all the water sample is discharged from the side of the first flow path 11 that is connected to the outside. After the water sample stabilizes, open the third valve 123 and the fourth valve 131, and at the same time adjust the first valve 111 until the flow rate of the water sample flowing through the third flow path 13 is the flow rate value required for the subsequent flow through the cation exchange column 2, that is, the flow rate displayed by the third flowmeter 132 is the flow rate value required for the subsequent flow through the cation exchange column 2. After the water sample flow rate reaches the requirement, Open the second valve 121 and close the fourth valve 131 to allow the bubble-free water sample to stably enter the cation exchange column 2. The water sample gradually moves from the bottom to the top of the cation exchange column 2, removing cations from the bubble-free water sample before entering the electrode cell 32. After the electrode cell 32 begins to drain, adjust the opening of the first valve 111 to regulate the flow rate until it meets the inlet requirements of the electrode 31, i.e., the flow rate displayed by the second flow meter 122 is between 250-350 mL / min. Then, the hydrogen conductivity of the water sample in the electrode cell 32 is detected through the electrode 31, and the detection result is compared with the value displayed by the online chemical instrument through the relevant controller or manually to determine the accuracy of the hydrogen conductivity of the online chemical instrument. Further, when it is necessary to switch water samples for continued testing, repeat the above steps until all water samples to be tested have been tested. Finally, when all testing is completed, close the second valve 121, open the fourth valve 131, and then disconnect the connection between the main inlet 14 and the water vapor sampling point 4.

[0043] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An online chemical instrument testing device, characterized in that, Includes a degassing unit, a cation exchange column, and an electrode detection unit; The degassing unit includes a main inlet for connection to the water vapor sampling point and multiple flow paths. At least one of the flow paths can be connected to the outside for discharging or diverting water samples. At least one of the flow paths can be connected to the cation exchange column, which is connected to the electrode detection unit.

2. The online chemical instrument testing device as described in claim 1, characterized in that, The flow path includes a first flow path connecting the main inlet and the outside, and a first valve is provided on the first flow path. The first valve is a flow regulating valve.

3. The online chemical instrument testing device as described in claim 2, characterized in that, A first flow meter is also provided on the first flow path, and the first flow meter is located on the side of the first valve away from the outside.

4. The online chemical instrument testing device as described in claim 1, characterized in that, The flow path includes a second flow path connecting the main inlet and the cation exchange column. A second valve is provided on the second flow path, which is an on / off valve or a flow regulating valve.

5. The online chemical instrument testing device as described in claim 4, characterized in that, A second flow meter is also provided in the second flow path, and the second flow meter is located between the second valve and the cation exchange column.

6. The online chemical instrument testing device as described in claim 4, characterized in that, The second flow path is also provided with a third valve, which is located upstream of the second valve, and the third valve is an on / off valve or a flow regulating valve; The flow path also includes a third flow path, on which a fourth valve is provided. The fourth valve is an on / off valve. The connection between the third flow path and the second flow path is located between the second valve and the third valve, and the other end of the third flow path is connected to the outside.

7. The online chemical instrument testing device as described in claim 1, characterized in that, The inlet of the cation exchange column is located below the cation exchange column, and the outlet of the cation exchange column is located above the cation exchange column.

8. The online chemical instrument testing device as described in claim 1, characterized in that, The electrode detection unit includes an electrode and an electrode cell. The inlet of the electrode cell is connected to the outlet of the cation exchange column. The electrode is used to detect the water sample entering the electrode cell. The outlet of the electrode pool is connected to the outside.

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