Device and method for monitoring soluble impurity content in solution based on measuring pressure difference

Abstract

The present invention proposes a device and method for monitoring the soluble impurity content in a solution based on measuring differential pressure, which relates to the field of analytical measurement technology. The device includes a main liquid inlet pipeline, a first branch pipeline, and a second branch pipeline. The first branch pipeline and the second branch pipeline are connected in parallel to the main liquid inlet pipeline. A first resistance tube and a regulating valve are connected in series along the flow direction of the solution on the first branch pipeline. A second resistance tube and a test tube are connected in series along the flow direction of the solution on the second branch pipeline. The test tube is provided with a temperature regulating component and a temperature measuring component. A differential pressure transmitter is connected between the outlet of the first resistance tube and the outlet of the second resistance tube. The device and method for monitoring the soluble impurity content in a solution based on measuring differential pressure proposed by the present invention can continuously measure the soluble impurity content in a solution without stopping the test loop.

Description

Technical Field

[0001] The present invention relates to the technical field of analysis and measurement, and in particular to a device and method for monitoring the content of soluble impurities in a solution based on measuring pressure difference. Background Art

[0002] In a non-isothermal test loop, impurities in the solution easily migrate from the high-temperature zone to the low-temperature zone. When the impurity content in the solution exceeds its saturated solubility at the corresponding temperature, the impurities will be released from the solution in the low-temperature zone and deposited on the pipes or equipment. Impurities deposited on the pipes will block the pipes, causing the flow channel to narrow, and in severe cases, cause unplanned downtime. Impurities deposited on equipment (such as heat exchangers) will affect the equipment's heat transfer efficiency. Although cold traps, hot traps, and other related equipment are arranged in the test loop to purify impurities, measuring the impurity content in the solution is still a key parameter that experimental operators must always pay attention to.

[0003] Currently, the main method for impurity measurement is offline chemical analysis, but during the measurement process, the solution needs to be pretreated to meet the instrument measurement requirements. This measurement method has disadvantages such as being time-consuming and cumbersome to operate.

[0004] In view of this, the inventors, based on many years of experience in production design in this field and related fields, have designed a device and method for monitoring the content of soluble impurities in a solution based on measuring pressure difference after repeated experiments, in order to solve the problems existing in the prior art. Summary of the Invention

[0005] The object of the present invention is to provide a device and method for monitoring the content of soluble impurities in a solution based on measuring pressure difference, which can continuously measure the content of soluble impurities in the solution without stopping the test circuit.

[0006] To achieve the above-mentioned purpose, the present invention proposes a device for monitoring the soluble impurity content in a solution based on measuring pressure difference, wherein the device includes a main liquid inlet pipeline, a first branch pipeline and a second branch pipeline, the first branch pipeline and the second branch pipeline are connected in parallel to the main liquid inlet pipeline, a first resistance tube and a regulating valve are connected in series in sequence along the flow direction of the solution on the first branch pipeline, a second resistance tube and a test tube are connected in series in sequence along the flow direction of the solution on the second branch pipeline, a temperature regulating component and a temperature measuring component are provided on the test tube, and a pressure differential transmitter is connected between the outlet of the first resistance tube and the outlet of the second resistance tube.

[0007] The present invention also provides a method for monitoring the content of soluble impurities in a solution based on measuring pressure difference, wherein the soluble impurities in the solution are measured using the above-mentioned device, comprising:

[0008] Step 1, opening the regulating valve and making the value displayed on the differential pressure transmitter zero;

[0009] Step 2, cooling the test tube by the temperature regulating component and monitoring the temperature of the test tube in real time by the temperature measuring component;

[0010] Step 3: When the value displayed by the differential pressure transmitter is not zero, the temperature T1 measured by the temperature measuring component is recorded to complete one measurement;

[0011] Step 4, heating the test tube by the temperature regulating component and monitoring the temperature of the test tube in real time by the temperature measuring component;

[0012] Step 5: When the differential pressure transmitter displays zero, repeat steps 2 to 3, record the temperature T2 measured by the temperature measuring component, and complete the secondary measurement.

[0013] Step 6, repeating steps 2 to 5, and sequentially recording the temperatures T3, T4 to Tn measured by the temperature measuring component;

[0014] Step 7: Calculate the soluble impurity content in the solution based on the temperatures T1 to Tn measured by the temperature measuring component.

[0015] Compared with the prior art, the present invention has the following characteristics and advantages:

[0016] The present invention proposes a device and method for monitoring the soluble impurity content in a solution based on measuring pressure difference. A temperature regulating component is used to change the temperature of a test tube, thereby changing the precipitation and dissolution of soluble impurities in the solution. At the same time, the precipitation of soluble impurities in the solution is judged by the changes in the differential pressure transmitter. The soluble impurity content in the solution can be calculated by combining the relationship between temperature and solubility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0018] Figure 1 Schematic diagram of a device for monitoring the content of soluble impurities in a solution based on measuring pressure difference proposed by the present invention;

[0019] Figure 2 Schematic diagram of the test tube in the present invention.

[0020] Description of reference numerals:

[0021] 100. Device for monitoring the content of soluble impurities in a solution based on measuring pressure difference;

[0022] 10. Liquid inlet main pipeline; 20. First branch pipeline;

[0023] 30. Second branch pipe; 40. First resistance pipe;

[0024] 50. Regulating valve; 60. Second resistance tube;

[0025] 70. Test tube; 71. Air duct;

[0026] 72. Fan; 73. Heat sink;

[0027] 74. Temperature measurement blind tube; 80. Differential pressure transmitter;

[0028] 90. Flow meter. DETAILED DESCRIPTION

[0029] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, a skilled person can conceive of any possible variations based on the present invention, and such variations should be considered to fall within the scope of the present invention.

[0030] like Figure 1 、 Figure 2 As shown, the present invention proposes a device 100 for monitoring the content of soluble impurities in a solution based on measuring pressure difference, comprising a main liquid inlet pipeline 10, a first branch pipeline 20 and a second branch pipeline 30, the first branch pipeline 20 and the second branch pipeline 30 being connected in parallel to the main liquid inlet pipeline 10, a first resistance tube 40 and a regulating valve 50 being connected in series in sequence along the flow direction of the solution on the first branch pipeline 20, a second resistance tube 60 and a test tube 70 being connected in series in sequence along the flow direction of the solution on the second branch pipeline 30, a temperature regulating component and a temperature measuring component being provided on the test tube 70, and a pressure differential transmitter 80 being connected between the outlet of the first resistance tube 40 and the outlet of the second resistance tube 60.

[0031] The present invention also provides a method for monitoring the content of soluble impurities in a solution based on measuring pressure difference, wherein the method uses the above-mentioned device to measure the soluble impurities in the solution, comprising:

[0032] Step 1: Open the regulating valve 50 and make the value displayed by the differential pressure transmitter 80 zero;

[0033] Step 2, cooling the test tube 70 by a temperature regulating component and monitoring the temperature of the test tube 70 in real time by a temperature measuring component;

[0034] Step 3: When the value displayed by the differential pressure transmitter 80 is not zero, the temperature T1 measured by the temperature measuring component is recorded to complete one measurement;

[0035] Step 4, heating the test tube 70 by a temperature regulating component and monitoring the temperature of the test tube 70 in real time by a temperature measuring component;

[0036] Step 5: When the differential pressure transmitter 80 displays zero, repeat steps 2 and 3 to record the temperature T2 measured by the temperature measuring component to complete the secondary measurement.

[0037] Step 6, repeat steps 2 to 5, and record the temperatures T3, T4 to Tn measured by the temperature measuring component in sequence;

[0038] Step 7: Calculate the soluble impurity content in the solution based on the temperatures T1 to Tn measured by the temperature measuring component.

[0039] The present invention proposes a device and method for monitoring the soluble impurity content in a solution based on measuring the pressure difference. The device and method utilize a temperature regulating component to change the temperature of the test tube 70, thereby changing the precipitation and dissolution of the soluble impurities in the solution. At the same time, the precipitation of the soluble impurities in the solution is judged by the changes in the differential pressure transmitter. The soluble impurity content in the solution can be calculated by combining the relationship between temperature and solubility.

[0040] The device 100 for monitoring the soluble impurity content in a solution based on measuring the pressure difference proposed in the present invention can be directly installed in a test loop without the need for offline chemical analysis, and can achieve continuous measurement of the soluble impurity content in the solution with high measurement efficiency.

[0041] The device 100 for monitoring the soluble impurity content in a solution based on measuring the pressure difference proposed in the present invention can be directly installed in a test loop without pre-treating the solution, and is simple to operate and convenient to measure.

[0042] The present invention proposes a device 100 for monitoring the content of soluble impurities in a solution based on measuring differential pressure, in which the liquid inlet of the first branch pipeline 20 and the liquid inlet of the second branch pipeline 30 are connected in parallel to the outlet of the main liquid inlet pipeline 10, and the liquid outlet of the first branch pipeline 20 and the liquid outlet of the second branch pipeline 30 are connected in parallel to the inlet of the main liquid outlet pipeline. By adopting the above structure, the device 100 for monitoring the content of soluble impurities in a solution based on measuring differential pressure can be connected to a non-isothermal test circuit through the main liquid inlet pipeline 10 and the main liquid outlet pipeline to realize online real-time detection.

[0043] The present invention proposes a device 100 for monitoring the soluble impurity content in a solution based on measuring pressure difference. A pressure differential transmitter 80 is connected between the outlet of the first resistance tube 40 and the outlet of the second resistance tube 60. The first resistance tube 40 and the second resistance tube 60 are connected in parallel, and the regulating valve 50 and the test tube 70 are connected in parallel. When the impurity content in the solution in the test tube 70 changes, the vertical display of the pressure differential transmitter 80 will also change.

[0044] In an optional embodiment of the present invention, the temperature control component includes a heating element and a cooling element. The heating element is used to heat the test tube 70, while the cooling element is used to cool the test tube 70. With this structure, the temperature control component can control the temperature of the test tube 70, thereby affecting the impurity content of the solution in the test tube 70.

[0045] In an optional example of this embodiment, the heating element is an electric heating wire (not shown in the figure) coated on the outer wall of the test tube 70, and the temperature of the solution in the test tube 10 can be increased by the electric heating wire.

[0046] In an optional example of this embodiment, the cooling element includes an air duct 71 and a fan 72. The air duct 71 is hollow and forms a receiving chamber. The test tube 70 extends through the receiving chamber. The receiving chamber has an air inlet and an air outlet, and the air inlet is connected to the fan 72. With this structure, when the test tube 70 needs to be cooled, the fan 72 is turned on, and cool air enters the receiving chamber through the air inlet and is discharged through the air outlet. The flowing air can effectively remove heat from the test tube 70.

[0047] In an optional example, the cooling component further includes a plurality of heat sinks 73 disposed on the outer wall of the test tube 70 to further enhance the heat dissipation efficiency of the test tube 70 .

[0048] Preferably, the plurality of heat sinks are sequentially spaced apart along the axial direction of the test tube 70 .

[0049] In an optional example, the fan is a variable frequency fan.

[0050] In an optional embodiment of the present invention, the temperature measurement component includes a temperature measuring blind tube 74 and a thermocouple (not shown in the figure), wherein the thermocouple is disposed in the temperature measuring blind tube 74, and the temperature measuring blind tube 74 is disposed in the test tube 70. The temperature measuring blind tube 74 protects the thermocouple and prevents the thermocouple from direct contact with the solution.

[0051] In an optional example of this embodiment, the temperature measuring component further includes an orifice plate 75 . The orifice plate 75 is disposed in the test tube 70 and located at the lower end of the temperature measuring blind tube 74 . A through hole is formed in the orifice plate 75 .

[0052] Preferably, the inner diameter of the through hole is 1 mm.

[0053] In an optional example of the present invention, both the first resistance tube 40 and the second resistance tube 60 are spiral pipes. Of course, the first resistance tube 40 and the second resistance tube 60 can also adopt other technologies well known to those skilled in the art.

[0054] In an optional embodiment of the present invention, a flow meter 90 is further provided on the main liquid inlet pipeline 10 .

[0055] In an optional embodiment of the present invention, in step 7, the calculation formula for the soluble impurity content is:

[0056] lgc=AB / T(1)

[0057] Where: c is the total content of soluble impurities (measured as oxygen content), unit is ppm; A and B are constants, determined according to the solubility of oxygen in different solutions; T is the temperature at which soluble impurities in the solution begin to precipitate upon cooling, i.e. T1-Tn, unit is K.

[0058] Please refer to Figure 1 、 Figure 2 Now, in conjunction with an embodiment, the specific implementation process of the device and method for monitoring the soluble impurity content in a solution based on measuring the pressure difference proposed by the present invention is described in detail:

[0059] In this embodiment, the device 100 for monitoring the content of soluble impurities in a solution based on measuring pressure difference includes: a flow meter 90, a first resistance tube 40, a regulating valve 50, a test tube 70, a second resistance tube 60, a first branch pipeline 20, a second branch pipeline 30 and a liquid inlet main pipeline 10.

[0060] Flowmeter 90 is located on the main liquid inlet pipeline. The outlet of flowmeter 90 is divided into two branches (i.e., first branch 20 and second branch 30). First branch 20 is connected to first resistance tube 40 and regulating valve 50, while second branch 30 is connected to second resistance tube 60 and test tube 70. First resistance tube 40 and second resistance tube 60 are connected in parallel, while regulating valve 50 and test tube 70 are connected in parallel. A differential pressure transmitter 80 is installed between the outlets of first resistance tube 40 and second resistance tube 60.

[0061] Furthermore, both the first resistance tube 40 and the second resistance tube 60 are spiral pipes. A fan 72 and a duct 71 are provided on the outside of the test tube 70. The duct 71 has an air inlet and an air outlet on its side, and the air inlet is connected to the fan 72, which is preferably a variable frequency blower. Heat sinks 73 are provided on the outside of the test tube 70, and are arranged along the axial direction of the test tube 70. A temperature-measuring blind tube 74 is provided at the top of the test tube 70. A thermocouple is arranged inside the temperature-measuring blind tube 74 for measuring the temperature of the solution. An orifice plate 75 with a 1 mm diameter through-hole is provided inside the test tube 70, and the orifice plate 75 is located at the lower end of the temperature-measuring blind tube 74. An electric heating wire is wrapped around the test tube 70 to increase the temperature of the solution inside the test tube 70.

[0062] The device for monitoring the soluble impurity content in a solution by measuring the pressure difference of the present invention is used to monitor the soluble impurity content in the solution, which mainly includes the following steps:

[0063] Step 1: Open the regulating valve 50 so that the differential pressure transmitter 80 between the outlet of the first resistance tube 40 and the outlet of the second resistance tube 60 displays a value of zero;

[0064] Step 2: Start the fan 72, control the temperature drop rate of the solution in the test tube 70 by adjusting the speed of the fan 72, and monitor the temperature of the solution in the test tube 70 in real time through the thermocouple in the temperature measuring blind tube 74;

[0065] Step 3: When the value of the differential pressure transmitter 80 between the outlet of the first resistance tube 40 and the outlet of the second resistance tube 60 is not zero (i.e., when a change occurs), record the temperature T1 measured by the thermocouple, and complete one measurement;

[0066] Step 4: Turn off the fan 72 and turn on the power supply of the electric heating wire wrapped around the test tube 70 to heat the solution in the test tube 70;

[0067] Step 5: When the differential pressure transmitter 80 displays zero, turn off the power supply of the electric heating wire, repeat steps 2 to 3, and record the temperature T2 measured by the thermocouple to complete the second measurement.

[0068] Step 7, repeat steps 2 to 5, and record the temperatures T3, T4 to Tn measured by the thermocouple in sequence. The total soluble impurity content in the solution can be calculated using the following soluble impurity content calculation formula (1), thereby realizing continuous monitoring of the soluble impurity content in the solution.

[0069] Calculation formula for soluble impurity content:

[0070] lg c=AB / T(1)

[0071] Where: c is the total content of soluble impurities (measured as oxygen content), unit is ppm; A and B are constants determined according to the solubility of oxygen in different solutions; T is the temperature at which soluble impurities in the solution begin to precipitate upon cooling (i.e., T1-Tn), unit is K.

[0072] According to the present invention, a device and method for monitoring the soluble impurity content in a solution based on measuring pressure difference can monitor the soluble impurity content in the solution online in real time, with simple operation and high measurement efficiency.

[0073] The detailed explanations of the above-mentioned embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limiting the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless otherwise clearly described, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A device for monitoring the content of soluble impurities in a solution based on measuring pressure difference, characterized in that: The device includes a main liquid inlet pipeline, a first branch pipeline and a second branch pipeline. The first branch pipeline and the second branch pipeline are connected in parallel to the main liquid inlet pipeline. A first resistance tube and a regulating valve are connected in series along the solution flow direction on the first branch pipeline. A second resistance tube and a test tube are connected in series along the solution flow direction on the second branch pipeline. A temperature regulating component and a temperature measuring component are provided on the test tube. A differential pressure transmitter is connected between the outlet of the first resistance tube and the outlet of the second resistance tube. When the impurity content in the solution in the test tube changes, the displayed value of the differential pressure transmitter also changes.

2. The device for monitoring the content of soluble impurities in a solution based on measuring pressure difference according to claim 1, characterized in that: The temperature regulating component includes a heating element and a cooling element.

3. The device for monitoring the content of soluble impurities in a solution based on measuring pressure difference according to claim 2, characterized in that: The heating element is a point heating wire wrapped around the outer wall of the test tube.

4. The device for monitoring the content of soluble impurities in a solution based on measuring pressure difference according to claim 2, characterized in that: The cooling component includes a wind tube and a fan. The wind tube is hollow inside and forms a receiving cavity. The test tube passes through the receiving cavity. The receiving cavity has an air inlet and an air outlet. The air inlet is connected to the fan.

5. The device for monitoring the content of soluble impurities in a solution based on measuring pressure difference according to claim 4, characterized in that: The cooling component further includes a plurality of heat sinks arranged on the outer wall of the test tube.

6. The device for monitoring the content of soluble impurities in a solution based on measuring pressure difference according to claim 1, characterized in that: The temperature measuring component includes a temperature measuring blind tube and a thermocouple, wherein the thermocouple is arranged in the temperature measuring blind tube, and the temperature measuring blind tube is arranged in the test tube.

7. The device for monitoring the content of soluble impurities in a solution based on measuring pressure difference according to claim 6, characterized in that: The temperature measuring component further comprises an orifice plate, which is arranged in the test tube and located at the lower end of the temperature measuring blind tube, and has a through hole formed on the orifice plate.

8. The device for monitoring the content of soluble impurities in a solution based on measuring pressure difference according to claim 7, characterized in that: The inner diameter of the through hole is 1 mm.

9. The device for monitoring the content of soluble impurities in a solution based on measuring pressure difference according to claim 1, characterized in that: A flow meter is also provided on the liquid inlet main pipeline.

10. A method for monitoring the content of soluble impurities in a solution based on measuring pressure difference, characterized in that: Measuring soluble impurities in a solution using the device according to any one of claims 1 to 9, comprising: Step 1, opening the regulating valve and making the value displayed on the differential pressure transmitter zero; Step 2, cooling the test tube by the temperature regulating component and monitoring the temperature of the test tube in real time by the temperature measuring component; Step 3: When the value displayed by the differential pressure transmitter is not zero, the temperature T1 measured by the temperature measuring component is recorded to complete one measurement; Step 4, heating the test tube by the temperature regulating component and monitoring the temperature of the test tube in real time by the temperature measuring component; Step 5: When the differential pressure transmitter displays zero, repeat steps 2 to 3, record the temperature T2 measured by the temperature measuring component, and complete the secondary measurement. Step 6, repeating steps 2 to 5, and sequentially recording the temperatures T3, T4 to Tn measured by the temperature measuring component; Step 7: Calculate the soluble impurity content in the solution based on the temperatures T1 to Tn measured by the temperature measuring component.

11. The method for monitoring the content of soluble impurities in a solution based on measuring pressure difference according to claim 10, wherein: In step 7, the soluble impurity content is calculated as: lgc=AB / T (1) Where: c is the total content of soluble impurities, in ppm; A and B are constants, determined according to the solubility of oxygen in different solutions; T is the temperature at which soluble impurities in the solution begin to precipitate upon cooling, i.e. T1-Tn, in K.

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