Flow path system of potassium ion, calcium ion and chloride ion online analyzer

Abstract

The utility model provides a flow path system of an on-line analyzer for potassium ions, calcium ions and chloride ions, which relates to the technical field of on-line analyzer calibration and comprises a liquid distribution valve, a pump body, a mixing and stirring pool and an electrode assembly which are connected in sequence, the liquid distribution valve is used for distributing one of air, a first standard solution mixed with potassium ions, calcium ions and chloride ions, a second standard solution mixed with potassium ions, calcium ions and chloride ions, a total ion strength regulator and a water sample to be detected to enter the pump body; a first control valve, a second control valve and a third control valve; before the to-be-measured water sample is measured each time, the control assembly forcibly and automatically uses the first standard solution and the second standard solution for calibration operation, so that the quality of measured data of the to-be-measured water sample is ensured, and operation and maintenance personnel do not need to go to the site for manual calibration in a long-time unattended state; and the concentrations of potassium ions, calcium ions and chloride ions of the water sample to be detected, which is finally output each time, are well ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of on-line water quality analysis instrument calibration, and more specifically, relates to a flow path system of an on-line analyzer for potassium ions, calcium ions and chloride ions. Background Technique

[0002] At present, the ratio of the potassium ion concentration of process water in an industrial water system to the potassium ion concentration in makeup water is used to reflect the concentration multiple of the water system. Calcium ions are the crystal-forming ions of calcium carbonate scale, and their concentration is used to reflect the scaling tendency of the system. Chloride ions have the potential hazard of causing pitting corrosion of carbon steel and stainless steel, and their concentration is used to reflect the corrosion tendency of the system. Therefore, on-line detection of the three indicators of potassium ions, calcium ions and chloride ions is of great significance for the water quality management of industrial water systems.

[0003] Currently, most on-line analyzers of the sensor type do not have an automatic calibration function. It is necessary for maintenance personnel to go to the site for manual calibration at intervals (usually once a month or several months). That is, carry a standard solution or quality control solution with a clear nominal value to the site and let the on-line analyzer inject samples for measurement. According to the deviation between the measured value and the nominal value, reset the correction coefficient or blank value to make the measured value output by the on-line analyzer equal to or close to the nominal value. However, this calibration interval is too long and cannot guarantee the quality of measurement data in the long-term unattended state. Most users are skeptical about this kind of data. In principle of quantitative analysis of instruments, any analytical instrument should be calibrated before measurement to ensure the quality of measurement data. Content of the Utility Model

[0004] The purpose of the utility model is to aim at the existing technical deficiencies and provide a flow path system of an on-line analyzer for potassium ions, calcium ions and chloride ions, so as to solve the problem that most current on-line analyzers of the sensor type do not have an automatic calibration function and it is necessary for maintenance personnel to go to the site for manual calibration at intervals, which seriously affects the quality of detection data in the long-term unattended state as mentioned in the above background technique.

[0005] In order to achieve the above purpose, the utility model provides a flow path system of an on-line analyzer for potassium ions, calcium ions and chloride ions, and the flow path system includes:

[0006] A liquid distribution valve, a pump body, a mixing and stirring tank and an electrode assembly connected in sequence. The liquid distribution valve is used to distribute one of air, a first standard solution mixed with potassium ions, calcium ions and chloride ions, a second standard solution mixed with potassium ions, calcium ions and chloride ions, a total ion strength regulator and a water sample to be measured into the pump body;

[0007] A first control valve, a second control valve, and a third control valve. The first control valve is disposed between the pump body and the mixing and stirring tank. The first control valve can control the fluid to be discharged into the mixing and stirring tank or to the outside of the system. The second control valve is disposed between the mixing and stirring tank and the battery assembly. The mixing and stirring tank is provided with a vent port, and the vent port is connected to the third control valve;

[0008] A control component, which is electrically connected to the liquid distribution valve, the pump body, the first control valve, the second control valve, the third control valve, and the mixing and stirring tank. The control component can send instructions to the liquid distribution valve, the pump body, the first control valve, the second control valve, the third control valve, and the mixing and stirring tank to realize the potential generated by the electrode assembly when measuring potassium ions, calcium ions, and chloride ions in the first standard solution, the second standard solution, and the water sample to be measured in sequence.

[0009] Preferably, the liquid distribution valve is provided with a liquid distribution outlet, an air inlet, a first standard solution inlet, a second standard solution inlet, a total ion strength regulator inlet, and a water sample to be measured inlet.

[0010] Preferably, the first control valve is provided with a first inlet, a first outlet, and a second outlet, and the first outlet is communicated with the mixing and stirring tank.

[0011] Preferably, the first control valve is a solenoid valve.

[0012] Preferably, both the second control valve and the third control valve are pressure tube valves.

[0013] Preferably, the pump body is a peristaltic pump.

[0014] Preferably, the flow path system for on-line analysis of potassium ions, calcium ions, and chloride ions further includes a filter head, and the filter head is connected to the water sample to be measured inlet.

[0015] Preferably, the electrode assembly includes a potassium ion potential detection component, a calcium ion potential detection component, and a chloride ion potential detection component.

[0016] Preferably, the flow path system of the on-line analyzer for potassium ions, calcium ions, and chloride ions further includes a locator, and the locator is disposed between the second control valve and the electrode assembly.

[0017] Preferably, both the second outlet and the outlet of the electrode assembly lead to the outside of the system (generally a waste liquid bottle or a waste liquid bucket).

[0018] The present utility model provides a flow path system for an on-line analyzer of potassium ions, calcium ions and chloride ions, and its beneficial effects are as follows: after receiving the instructions sent by the control component, the first control valve, the second control valve and the third control valve of the flow path system can automatically perform opening and closing actions to measure the potentials generated by potassium ions, calcium ions and chloride ions in the first standard solution, the second standard solution and the water sample to be measured in sequence. Before each measurement of the water sample to be measured, the measured concentration is calibrated with the first standard solution and the second standard solution, so that the quality of the measured concentration results of potassium ions, calcium ions and chloride ions in the water sample to be measured is well guaranteed. Under the state of long-term unattended operation, there is no need for maintenance personnel to go to the site for manual calibration.

[0019] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation section. Brief Description of the Drawings

[0020] By describing the exemplary embodiments of the present utility model in more detail in conjunction with the drawings, the above-mentioned and other objects, features and advantages of the present utility model will become more obvious. Among them, in the exemplary embodiments of the present utility model, the same reference numerals generally represent the same components.

[0021] Figure 1 The structural schematic diagram of a flow path system for an on-line analyzer of potassium ions, calcium ions and chloride ions according to an embodiment of the present utility model is shown.

[0022] Description of the Reference Numerals in the Drawings

[0023] 1, dispensing valve; 2, pump body; 3, mixing and stirring tank; 4, electrode assembly; 5, first control valve; 6, second control valve; 7, third control valve; 8, vent port; 9, air inlet; 10, first standard solution inlet; 11, second standard solution inlet; 12, total ion strength regulator inlet; 13, water sample to be measured inlet; 14, first outlet; 15, second outlet. Detailed Description of the Preferred Embodiments

[0024] The preferred embodiments of the present utility model will be described in more detail below. Although the following describes the preferred embodiments of the present utility model, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present utility model more thorough and complete, and to fully convey the scope of the present utility model to those skilled in the art.

[0025] As Figure 1 shown, the present utility model provides a flow path system for an on-line analyzer of potassium ions, calcium ions and chloride ions, and the flow path system includes:

[0026] A liquid dispensing valve 1, a pump body 2, a mixing and stirring tank 3, and an electrode assembly 4 connected in sequence. The liquid dispensing valve 1 is used to distribute one of air, a first standard solution, a second standard solution, a total ion strength regulator, and a water sample to be measured into the pump body 2;

[0027] A first control valve 5, a second control valve 6, and a third control valve 7. The first control valve 5 is arranged between the pump body 2 and the mixing and stirring tank 3. The first control valve 5 can control the fluid to be discharged or discharged into the mixing and stirring tank 3. The second control valve 6 is arranged between the mixing and stirring tank 3 and the battery assembly 4. The mixing and stirring tank 3 is provided with a vent port 8, and the vent port 8 is connected to the third control valve 7;

[0028] A control component, which is electrically connected to the liquid dispensing valve 1, the pump body 2, the first control valve 5, the second control valve 6, the third control valve 7, and the mixing and stirring tank 3. The control component can send instructions to the liquid dispensing valve 1, the pump body 2, the first control valve 5, the second control valve 6, the third control valve 7, and the mixing and stirring tank 3 to measure the potentials generated by potassium ions, calcium ions, and chloride ions in the first standard solution, the second standard solution, and the water sample to be measured in sequence by the electrode assembly 4.

[0029] Specifically, to solve the problem that most current on-line analyzers of sensor types do not have an automatic calibration function, and it is necessary for maintenance personnel to go to the site for manual calibration at intervals, which seriously affects the quality of detection data in the long-term unattended state. The present utility model provides a flow path system for an on-line analyzer of potassium ions, calcium ions, and chloride ions. The control component of this flow path system is a PLC controller. The PLC controller is programmed with programs for controlling the liquid dispensing valve 1, the pump body 2, the first control valve 5, the second control valve 6, the third control valve 7, and the mixing and stirring tank 3. The control program of the PLC controller is prior art, and the control function of this flow path system can be realized. The first control valve 5, the second control valve 6, and the third control valve 7 of this flow path system can automatically perform opening and closing actions after receiving the instructions sent by the control component to measure the potentials generated by potassium ions, calcium ions, and chloride ions in the first standard solution, the second standard solution, and the water sample to be measured in sequence. Before each measurement of the water sample to be measured, the control component always forcibly and automatically uses the first standard solution and the second standard solution to perform calibration operations, ensuring the quality of the measurement data of the water sample to be measured. In the long-term unattended state, it is not necessary for maintenance personnel to go to the site for manual calibration.

[0030] Specifically, the first standard solution and the second standard solution are mixed standard solutions of three ions (potassium ions, calcium ions, and chloride ions) with different high and low concentrations; the total ion strength regulator (TISAB) is used to control the ion strength, and air is used to remove the residues in this flow path system.

[0031] Preferably, the liquid dispensing valve 1 is provided with a flow distribution outlet, an air inlet 9, a first standard solution inlet 10, a second standard solution inlet 11, a total ion strength regulator inlet 12, and a water sample to be measured inlet 13.

[0032] Specifically, the liquid dispensing valve 1 is a five-in-one-out liquid dispensing valve, and only one inlet and one outlet can be in operation in each state.

[0033] Preferably, the first control valve 5 is provided with a first inlet, a first outlet 14, and a second outlet 15, and the first outlet 14 communicates with the mixing and stirring tank 3.

[0034] Specifically, the first control valve 5 is a two-position three-way solenoid valve.

[0035] Preferably, both the second control valve 6 and the third control valve 7 are pressure tube valves.

[0036] Preferably, the pump body 2 is a peristaltic pump.

[0037] Preferably, the flow path system for on-line analysis of potassium ions, calcium ions, and chloride ions further includes a filter head, and the filter head is connected to the water sample to be measured inlet.

[0038] Specifically, the water sample to be measured is sucked into the flow path system from the position of the filter head.

[0039] Preferably, the electrode assembly includes a potassium ion potential detection component, a calcium ion potential detection component, and a chloride ion potential detection component.

[0040] Specifically, the electrode assembly is used to read the potentials generated by potassium ions, calcium ions, and chloride ions in the first standard solution, the second standard solution, or the water sample to be measured.

[0041] Preferably, the flow path system of the on-line analyzer for potassium ions, calcium ions, and chloride ions further includes a locator, and the locator is arranged between the second control valve 6 and the electrode assembly 4.

[0042] Specifically, the locator can identify whether it is air or solution in the flow path system to ensure that the pipeline passing through the electrode assembly 4 is filled with the water sample to be measured during measurement, and to ensure that the air expels the residue of the previous sample in the flow path system.

[0043] Preferably, both the second outlet 15 and the outlet of the electrode assembly 4 lead to the outside of the system (generally a waste liquid bottle or a waste liquid bucket).

[0044] In summary, when the flow path system of the on-line analyzer for potassium ions, calcium ions, and chloride ions of the present invention is implemented, as Figure 1 shown, it specifically includes:

[0045] The calibration steps of the flow path system include:

[0046] The dispensing valve 1 is switched to the first standard solution inlet 10, the first outlet 14 of the first control valve 5 (two-position three-way solenoid valve) is closed and the second outlet 15 is opened. The first standard solution passes through the dispensing valve 1, the pump body 2, and is discharged through the second outlet 15 of the first control valve 5 and lasts for 30 s.

[0047] The third control valve 7 is closed, the second control valve 6 is opened, the first outlet 14 of the first control valve 5 is opened and the second outlet 15 is closed. The first standard solution passes through the mixing and stirring tank 3 to reach the electrode assembly 4 to read the response potential E corresponding to each electrode and the first standard solution c A A , and the first standard solution is discharged from the outlet of the electrode assembly 4 and lasts for 30 s.

[0048] The dispensing valve 1 is switched to the second standard solution inlet 11, and the above two steps are repeated to read the response potential E corresponding to each electrode and the second standard solution c B B ;

[0049] The dispensing valve 1 is switched to the air inlet 9 to empty the flow path system and lasts for 30 s.

[0050] The measurement steps of the flow path system include:

[0051] The third control valve 7 is opened, the second control valve 6 is closed, the dispensing valve 1 is switched to the water sample to be measured inlet 13, and a certain period of time is preset to inhale a quantitative water sample to be measured. The dispensing valve 1 is switched to the air inlet 9 to push the remaining water sample to be measured in the pipeline in front of the mixing and stirring tank 3 into it;

[0052] The dispensing valve 1 is switched to the total ion strength regulator inlet 12, and a certain period of time is preset to inhale the same amount of total ion strength regulator as the water sample to be measured. The dispensing valve 1 is switched to the air inlet 9 to push the remaining total ion strength regulator in the pipeline in front of the mixing and stirring tank 3 into it, and the mixing and stirring tank 3 is started to stir and a certain time delay is set;

[0053] The third control valve 7 is closed, the second control valve 6 is opened, and the mixed test solution reaches the electrode assembly 4 to read the response potential E corresponding to the water sample to be measured X , and the mixed test solution is discharged from the outlet of the electrode assembly 4 and lasts for 30 s.

[0054] Stop the stirring of the mixing and stirring tank 3, open both the second control valve 6 and the third control valve 7, and enter the sleep state to wait for the next wake-up.

[0055] The concentration calculation method of the on-line analyzer includes:

[0056] ​​Equation (1) and Equation (2) respectively correspond to two tests in the calibration step; Equation (4) corresponds to the test in the measurement step; although these three tests may have offsets, due to the close time, the offset amounts are also close, and when using the difference between two by two for quantification, this offset effect can be eliminated; Equation (3) indicates that the slope s of the electrode can be obtained from Equation (1) and Equation (2), which is determined by the difference between two potentials in the calibration step, so it is hardly affected by the offset. Equation (5) is the calculation formula for the concentration of the water sample to be measured, and it is also determined by the difference between two measured potentials, so it is also hardly affected by the offset;

[0057] The total ion strength regulator is used to dilute the concentration of the water sample to be measured by a factor of two. The purpose is to make different water samples to be measured be determined under the same ionic strength as much as possible;

[0058] E A = K + slgc A (1)

[0059] E B = K + slgc B (2)

[0060] Where c A and c B are the concentrations of a certain ion (potassium, calcium, chlorine) in the first standard solution and the second standard solution respectively; K is an unknown constant value including the standard electrode potential, liquid junction potential, circuit voltage drop, etc. Although it is difficult to measure, it is a constant value for a fixed measurement system; s is the response slope of the electrode; Subtracting (1) from (2) to eliminate K gives

[0061]

[0062] Measure the potential when the water sample to be measured is diluted by a factor of two with the total ion strength regulator, mixed evenly, and fills the flow path system

[0063]

[0064] By subtracting Equation (1) from Equation (4) and arranging, the concentration of a certain ion in the water sample to be measured can be obtained

[0065]

[0066] The above has described the embodiments of the present invention. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments.

Claims

1. A flow path system of an online analyzer for potassium ions, calcium ions and chloride ions, characterized in that: The flow system includes: A liquid dispensing valve, a pump body, a mixing and stirring tank and an electrode assembly connected in sequence, wherein the liquid dispensing valve is used to distribute one of air, a first standard solution of a mixture of potassium ions, calcium ions and chloride ions, a second standard solution of a mixture of potassium ions, calcium ions and chloride ions, a total ionic strength regulator and a water sample to be tested into the pump body; a first control valve, a second control valve and a third control valve, wherein the first control valve is arranged between the pump body and the mixing and stirring tank, and the first control valve can control the discharge of fluid from or into the mixing and stirring tank, and the second control valve is arranged between the mixing and stirring tank and the battery assembly, and the mixing and stirring tank is provided with a vent, and the vent is connected to the third control valve; A control component is electrically connected to the liquid dispensing valve, the pump body, the first control valve, the second control valve, the third control valve and the mixing and stirring tank. The control component can send instructions to the liquid dispensing valve, the pump body, the first control valve, the second control valve, the third control valve and the mixing and stirring tank to enable the electrode assembly to sequentially measure the potentials generated by potassium ions, calcium ions and chloride ions in the first standard solution, the second standard solution and the water sample to be tested.

2. The flow path system of the online analyzer for potassium ions, calcium ions and chloride ions according to claim 1, characterized in that: The liquid dispensing valve is provided with a dispensing outlet, an air inlet, a first standard solution inlet, a second standard solution inlet, a total ionic strength regulator inlet and a water sample inlet to be tested.

3. The flow path system of the online analyzer for potassium ions, calcium ions and chloride ions according to claim 1, characterized in that: The first control valve is provided with a first inlet, a first outlet and a second outlet, and the first outlet is communicated with the mixing and stirring tank.

4. The flow path system of the online analyzer for potassium ions, calcium ions and chloride ions according to claim 1, characterized in that: The first control valve is a solenoid valve.

5. The flow path system of the online analyzer for potassium ions, calcium ions and chloride ions according to claim 1, characterized in that: The second control valve and the third control valve are both compression pipe valves.

6. The flow path system of the online analyzer for potassium ions, calcium ions and chloride ions according to claim 1, characterized in that: The pump body is a peristaltic pump.

7. The flow path system of the online analyzer for potassium ions, calcium ions and chloride ions according to claim 2, characterized in that: The flow path system for online analysis of potassium ions, calcium ions and chloride ions also includes a filter head, which is connected to the inlet of the water sample to be tested.

8. The flow path system of the online analyzer for potassium ions, calcium ions and chloride ions according to claim 1, characterized in that: The electrode assembly includes a potassium ion potential detection component, a calcium ion potential detection component and a chloride ion potential detection component.

9. The flow path system of the online analyzer for potassium ions, calcium ions and chloride ions according to claim 1, characterized in that: The flow path system of the online analyzer for potassium ions, calcium ions and chloride ions further includes a positioner, which is disposed between the second control valve and the electrode assembly.

10. The flow path system of the online analyzer for potassium ions, calcium ions and chloride ions according to claim 3, characterized in that: The second outlet and the outlet of the electrode assembly both lead to the outside of the system.

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