A device and method for online measuring the content of ferromagnetic particles in a solution

Abstract

The present invention discloses a device for online measuring the content of ferromagnetic particles in a solution, wherein the solution circulates in a main pipeline, the device comprises a branch pipeline and a measuring module located on the branch pipeline, both ends of the branch pipeline are connected to the main pipeline; the measuring module comprises a measuring tube, the measuring tube comprises a solenoid assembly, the solenoid assembly comprises a permanent magnet tube and a plurality of solenoids located in the permanent magnet tube, the axial direction of the solenoid is parallel to the axial direction of the permanent magnet tube, and a channel for the solution to circulate is formed in the solenoid. The device and method for online measuring the content of ferromagnetic particles in a solution of the present invention provide technical support for real-time status monitoring of a secondary circuit water sample through the setting of a branch pipeline and a measuring module, can monitor the content of ferromagnetic particles in a water sample in real time, and provide key parameters for the evaluation and analysis of the chemical regulation effect of the secondary circuit water.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power detection, and specifically relates to a device for online measuring the content of ferromagnetic particles in a secondary loop solution of a pressurized water reactor nuclear power plant and a method for measuring the content of ferromagnetic particles by using the device. Background Art

[0002] At present, the fluid transportation systems such as secondary circuit pipelines, heaters and drain systems of domestic pressurized water reactor nuclear power plants are mostly made of carbon steel and low-alloy steel. The measurement of iron corrosion products produced during fluid transportation, especially the monitoring of ferromagnetic particles, is a key parameter for evaluating the effect of secondary circuit water chemical regulation.

[0003] At present, the detection of ferromagnetic particles is mainly achieved by sampling the secondary circuit solution on site and then using laboratory equipment to characterize the ferromagnetic particles in the water sample. The typical limitations of this method are: the distribution of ferromagnetic particles in the secondary circuit solution is random, the test method is out of the field, resulting in a long test cycle, and it is impossible to accurately monitor the number of ferromagnetic particles in real time. Summary of the invention

[0004] In view of this, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a device and method for online measuring the content of ferromagnetic particles in a solution, which is used to solve the problem that the prior art cannot perform real-time characterization of the content of ferromagnetic particles in the secondary loop solution of a nuclear power plant.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An object of the present invention is to provide an apparatus for online measuring the content of ferromagnetic particles in a solution, wherein the solution flows in a main pipeline, the apparatus comprises a branch pipeline and a measuring module located on the branch pipeline, and both ends of the branch pipeline are connected to the main pipeline;

[0007] The measuring module includes a measuring tube, which includes a solenoid assembly. The solenoid assembly includes a permanent magnet tube and multiple solenoids located in the permanent magnet tube. The axial direction of the solenoid is parallel to the axial direction of the permanent magnet tube. A channel for the solution to flow is formed in the solenoid.

[0008] According to some preferred embodiments of the present invention, the solenoid includes a coil and an insulating portion wrapped around the outside of the coil, and both ends of the coil include joints, wherein the joint at one end extends to the other end of the coil; the length of the insulating portion is greater than the length of the coil, and one end of the insulating portion is flush with one end of the coil. In some embodiments of the present invention, the insulating portion is made of erosion-resistant material, and one end of the insulating portion is flush with one end of the coil. Since the length of the insulating portion is greater than the length of the coil, the other end of the insulating portion has a portion longer than the coil, and the end of the solenoid corresponding to the extra portion is the head end of the solenoid, that is, the solution flows into the measuring tube from this end. Since the extra portion of the insulating portion is erosion-resistant, it can prolong the time before the end of the coil is damaged due to erosion.

[0009] According to some preferred implementation aspects of the present invention, the inner diameter of the solenoid gradually increases from the center of the permanent magnet tube to the outside; and connecting materials are filled between adjacent solenoids. In some embodiments of the present invention, since the flow rate of the solution located in the center of the measuring tube is lower than the flow rate of the solution located in the circumference of the measuring tube when the solution circulates in the measuring tube, the inner diameter of the solenoid located in the center is the smallest, and its inner diameter gradually increases from the center to the outside, so that small-sized ferromagnetic particles can pass through the solenoid from the center, and large-sized ferromagnetic particles can pass through the solenoid with a larger inner diameter near the outside due to the effect of gravity. Of course, in some other embodiments of the present invention, the inner diameters of multiple solenoids in the permanent magnet tube may not be arranged in the above manner, and solenoids with different inner diameters may be directly arranged in the permanent magnet tube. Even if ferromagnetic particles block the solenoid, they can be cleared through later maintenance.

[0010] According to some preferred embodiments of the present invention, the permanent magnet tube includes a permanent magnet and a shell wrapped around the permanent magnet, and the insulating portion of the solenoid close to the shell is connected to the shell; the length of the solenoid is less than or equal to the length of the shell. When the solution containing ferromagnetic particles passes through the measuring tube, the ferromagnetic particles can be magnetized due to the strong magnetic field of the permanent magnet, thereby causing the change of the magnetic flux of the coil, so that a weak voltage is generated at both ends of the coil. After capturing, amplifying and recording the weak voltage, the content of the ferromagnetic particles can be further obtained based on analysis. This is a way to measure ferromagnetic particles. If the length of the solenoid is greater than the length of the shell, it will affect the connection between the measuring tube and the branch pipe.

[0011] According to some preferred implementation aspects of the present invention, the inner diameter of the solenoid is 2-10 mm, and the length of the coil is less than or equal to the length of the permanent magnet. The permanent magnet will generate a strong magnetic field, which will cause changes in the magnetic flux inside the coil, so the length of the coil cannot exceed the length of the permanent magnet.

[0012] According to some preferred embodiments of the present invention, the material of the insulating part and the shell is the same as the connecting material, both of which are erosion-resistant materials, which can protect the permanent magnet and the coil from erosion. At the same time, the shell and the connecting material between adjacent insulating parts are filled at the same time, so that multiple solenoids and the permanent magnet tube are integrally formed.

[0013] According to some preferred implementation aspects of the present invention, the measuring tube includes a tube body, the axial direction of the solenoid is parallel to the axial direction of the tube body, and the axial direction of the tube body is parallel to the flow direction of the solution flowing through the measuring tube. In some embodiments of the present invention, flange connection surfaces are provided at both ends of the tube body, and the entire measuring tube is connected to the branch pipe through the flange connection surface, which is convenient to disassemble and has good sealing performance. In addition, the outer wall of the tube body is ferromagnetic and can be used to isolate the magnetic field, that is, to isolate the external magnetic field from the magnetic field generated by the permanent magnet.

[0014] According to some preferred implementation aspects of the present invention, a blocking portion is provided at one end of the tube body, the outer wall of the blocking portion is connected to the inner wall of the tube body, the end of the blocking portion is flush with the end of the tube body, and the blocking portion is used to place the solenoid assembly. The solenoid assembly is entirely located inside the tube body.

[0015] According to some preferred embodiments of the present invention, the measuring module includes a filter element, and the filter element is used to capture ferromagnetic particles. In some embodiments of the present invention, the filter element includes a first filter part and a second filter part, which are respectively used to capture ferromagnetic particles of different sizes. The role of setting the filter element includes two aspects: First, since the ferromagnetic particles are of no benefit to the fluid transportation of the entire secondary circuit, the filter element is used to collect these ferromagnetic particles and centrally treat them to prevent them from flowing back to the main pipeline with the solution; second, after the ferromagnetic particles are collected by the filter element, the distribution position of the ferromagnetic particles of different sizes on the filter element is statistically analyzed, which can provide reference opinions for the arrangement of the solenoids in the permanent magnet tube (how to arrange the solenoids with different inner diameters).

[0016] According to some preferred implementation aspects of the present invention, the measurement module further includes a measurement element, and the connector is electrically connected to the measurement element.

[0017] According to some preferred embodiments of the present invention, the branch pipeline includes a first branch, a second branch and a third branch connected in sequence, the first branch is located between the inlet of the main pipeline and the second branch, the third branch is located between the second branch and the outlet of the main pipeline, and the measurement module is located in the second branch.

[0018] According to some preferred embodiments of the present invention, it includes a first electrical module and a second electrical module respectively located in the first branch and the third branch; the first electrical module is used to control the flow rate, pressure and on-off time of the solution flowing from the first branch to the measuring module, and the second electrical module is used to control the flow rate, pressure and on-off time of the solution flowing from the second branch to the outlet of the main pipeline.

[0019] According to some preferred implementation aspects of the present invention, the first electrical module includes a first pump and a first flow meter, and the second electrical module includes a second pump and a second flow meter.

[0020] According to some preferred implementation aspects of the present invention, a cooling component is provided in the first branch, and a heating component is provided in the second branch. The cooling component is located between the main pipeline inlet and the first pump, and the heating component is located between the second pump and the main pipeline outlet. In some embodiments of the present invention, an electric valve and a compressor are also provided between the cooling component and the heating component to form a heat exchange module together. That is, the cooling component is the first heat exchanger, and the heating component is the second heat exchanger. When the temperature of the solution in the main pipeline is higher than 100°C, the heat exchange module is used to reduce the temperature of the solution flowing from the main pipeline inlet to the first pump to less than 100°C, and then heat the temperature of the solution flowing out of the second pump to the same temperature as the solution in the main pipeline. The heat exchange module is mainly used to open for heat exchange when the temperature of the solution in the main pipeline is high (higher than 100°C). When the temperature of the solution in the main pipeline is lower than 100°C, the heat exchange module does not need to be opened.

[0021] According to some preferred implementation aspects of the present invention, a first thermometer is provided at one end of the cooling component close to the first pump, and a second thermometer is provided at one end of the heating component away from the second pump. The setting of the positions of the first thermometer and the second thermometer can more accurately monitor the temperature of the solution flowing to the first pump, as well as the temperature of the solution flowing out of the second pump and merging into the main pipeline. When the temperature does not meet the requirements, continue to close the first pump or the second pump, and continue to cool or heat the solution until the temperature reaches the standard, and then turn on the pump to allow the solution to circulate. When the heat exchange module needs to be turned on, refrigerant needs to be added to the heat exchanger to convert heat between the first heat exchanger and the second heat exchanger.

[0022] The principle of heat exchange is: when the gas is compressed, the temperature rises; when the gas is compressed, the temperature drops. The whole heat exchange process is as follows:

[0023] (1) Close the electric valve in the heat exchange module;

[0024] (2) Start the compressor, extract the gas in the first heat exchanger and compress it into the second heat exchanger to increase its temperature and pressure (if the refrigerant is water, it will be liquefied after passing through the electric valve);

[0025] (3) The second heat exchanger transfers heat to the liquid flowing in the branch pipe located at the same position as the second heat exchanger by heat conduction; the temperature of the refrigerant in the second heat exchanger decreases;

[0026] (4) The electric valve is opened. The refrigerant in the second heat exchanger is in a high-pressure state and flows to the first heat exchanger through the electric valve. The pressure of the refrigerant in the pipeline between the electric valve and the first heat exchanger is reduced, and its temperature is further reduced (if the refrigerant is water, it will vaporize after passing through the electric valve);

[0027] (5) The liquid flowing in the branch pipe at the same position as the first heat exchanger heats the refrigerant in the first heat exchanger by heat conduction, causing it to increase in temperature and vaporize. The compressor extracts the gaseous refrigerant, and the heat exchange circuit completes one cycle and enters the next cycle.

[0028] Another object of the present invention is to provide a method for online measuring the content of ferromagnetic particles in a solution using the above device, including two methods, one is a passive method and the other is an active method.

[0029] The passive measurement method is as follows: when the solution flows from the inlet of the main pipeline through the branch pipeline to the measuring tube, the ferromagnetic particles in the solution will be magnetized by the strong magnetic field generated by the permanent magnet, thereby causing the magnetic flux of the coil in the solenoid to change, so that a weak voltage is generated at both ends of the coil. Since the two joints of the coil are connected to the measuring element, the weak voltage is captured and amplified by the measuring element, and the obtained voltage signal is recorded in real time and compared with the voltage signal calibration curve to obtain the content of ferromagnetic particles in the solution.

[0030] The active measurement method is: a pulsed current is passed through the solenoid. When the solution passes through the solenoid, the ferromagnetic particles in the solution will cause the inductance of the coil inside the solenoid to increase. The inductance value is measured and recorded in real time and compared with the inductance signal calibration curve. The content of ferromagnetic particles in the solution can also be obtained.

[0031] Specifically, the voltage signal calibration curve and the inductance signal calibration curve in the present invention are obtained by adding spherical particles of known size into the branch pipe, passing them through the measuring tube, simulating the electrical signal characteristics of the ferromagnetic particles to be detected, and recording the signal values. The operation steps are as follows:

[0032] (1) Perform factory calibration of the signal when the branch pipeline is not connected to the main pipeline, close the valves at the inlet and outlet of the main pipeline and remove the device;

[0033] (2) using ferromagnetic materials (preferably Fe4O3) to process into spherical particles, and selecting particles with a diameter of 0.5 to 100 μm during factory calibration;

[0034] (3) Connect the measuring device to a larger pure water tank (preferably with a capacity of 1 m 3 ) so that pure water can circulate in the branch pipes;

[0035] (4) taking out the filter element, turning on the first pump and the second pump, and after the flow rate (preferably set to 1 m / s) is stable, the pre-made spherical particles are divided into different batches according to the same particle size and different particle sizes, and the total weight of each batch is preferably 10 g. A certain mass (preferably 1 mg) of spherical particles is added into the pure water tank every 5 to 60 minutes. After the circuit part collects a stable signal, the spherical particles continue to be added until all the spherical particles of the same batch are added;

[0036] (5) Turn off the first pump and the second pump, close the valve behind the filter element and install the filter element, then turn on the first pump and the second pump, and use the filter element to filter and collect the spherical particles in the pure water; when the circuit part still cannot collect any signal, it can be considered that the filtering and collection is completed; repeat steps (4) and (5) until all batches of spherical particles are completely put in;

[0037] (6) Record the flow rate of the solution, the total amount of particles in the solution, the voltage value, the inductance value and other parameters, and generate a voltage signal calibration curve and an inductance signal calibration curve respectively.

[0038] Due to the adoption of the above technical scheme, compared with the prior art, the benefits of the present invention are: an apparatus and method for online measurement of the content of ferromagnetic particles in a solution of the present invention, through the setting of branch pipes and measurement modules, provides technical support for real-time status monitoring of secondary circuit water samples, and can monitor the content of ferromagnetic particles in water samples in real time, providing key parameters for the evaluation and analysis of the chemical regulation effect of the secondary circuit water. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 It is a schematic structural diagram of a device for online measuring the content of ferromagnetic particles in a solution in a preferred embodiment of the present invention;

[0041] Figure 2 It is a schematic diagram of the cross-sectional structure of the measuring tube at the first viewing angle in the preferred embodiment of the present invention;

[0042] Figure 3 It is a schematic diagram of the cross-sectional structure of the measuring tube at a second viewing angle in a preferred embodiment of the present invention;

[0043] Figure 4 It is a schematic structural diagram of a tube body of a measuring tube in a preferred embodiment of the present invention;

[0044] Figure 5 It is a schematic diagram of the structure of the coil in the solenoid in the preferred embodiment of the present invention;

[0045] In the accompanying drawings, main pipeline-1, first branch-2, first pump-21, first flowmeter-22, second branch-3, measuring tube-31, tube body-311, permanent magnet-312, shell-313, insulating part-314, coil-315, joint-316, blocking part-317, filter element-32, third branch-4, second pump-41, second flowmeter-42, heat exchange module-5, first heat exchanger-51, second heat exchanger-52, compressor-53, first thermometer-54, second thermometer-55. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0047] Embodiment 1: Device for online measurement of ferromagnetic particle content in solution

[0048] like Figures 1 to 5 As shown, the device for online measuring the content of ferromagnetic particles in a solution of this embodiment includes a branch pipe, a measuring module and a heat exchange module 5 located on the branch pipe. Both ends of the branch pipe are connected to the main pipe 1, and the solution in the secondary circuit circulates in the main pipe 1. The branch pipe includes a first branch 2, a second branch 3 and a third branch 4. The first branch 2 is located between the inlet of the main pipe 1 and the second branch 3, and the third branch 4 is located between the second branch 3 and the outlet of the main pipe 1; a first electrical module is arranged in the first branch 2, a measuring module is arranged in the second branch 3, a second electrical module is arranged in the third branch 4, and a heat exchange module 5 is arranged between the first branch 2 and the third branch 4.

[0049] The measuring module comprises a measuring tube 31, a measuring element (not shown) and a filter 32. Figure 2 and Figure 3As shown, the measuring tube 31 includes a tube body 311 and a solenoid assembly located inside the tube body 311. The solenoid assembly includes a permanent magnet tube and a plurality of solenoids located inside the permanent magnet tube, the axial direction of the solenoid is parallel to the axial direction of the permanent magnet tube, the axial direction of the solenoid is parallel to the axial direction of the tube body 311, the axial direction of the tube body 311 is parallel to the flow direction of the solution flowing through the measuring tube 31; a channel for the solution to flow is formed inside the solenoid. The solenoid includes a coil 315 and an insulating portion 314 wrapped around the outside of the coil 315, and both ends of the coil 315 include joints 316, wherein the joint 316 at one end extends to the other end of the coil 315, so that the two joints 316 are located at the same end of the coil 315 (such as Figure 5 As shown in the figure, the two connectors 316 on a solenoid are electrically connected to the measuring element. The length of the insulating portion 314 is greater than the length of the coil 315, and one end of the insulating portion 314 is flush with one end of the coil 315. The other end of the insulating portion 314 is longer than the coil 315. The end of the solenoid corresponding to the extended portion is the head end of the solenoid, that is, when the solution flows into the measuring tube 31, it flows in from this end. The extra insulating portion 314 is erosion-resistant and can extend the time before the end of the coil 315 is damaged due to erosion. In this embodiment, the insulating portion 314 is made of erosion-resistant material. In addition, in order to place the solenoid assembly in the tube body 311, a blocking portion 317 (as shown in the figure) is provided at one end of the tube body 311. Figure 4 As shown), the outer wall of the blocking portion 317 is connected to the inner wall of the tube body 311, and the end of the blocking portion 317 is flush with the end of the tube body 311, so that the solenoid assembly can be placed on the blocking portion 317 as a whole.

[0050] The multiple solenoids of this embodiment are evenly spaced in the permanent magnet tube, and connecting materials are filled between adjacent solenoids. The multiple solenoids are arranged in a manner that their inner diameters gradually increase from the center of the permanent magnet tube to the outside, and the solenoids with the same inner diameter are located on the circumference of the same circle; the inner diameter of the solenoid is 2-10 mm. The connecting material of this embodiment is the same as the material for preparing the insulating portion 314, and is also a corrosion-resistant material.

[0051] like Figure 2 and Figure 3As shown, the permanent magnet tube in this embodiment includes a permanent magnet 312 and a shell 313 made of erosion-resistant material wrapped outside the permanent magnet 312, and the insulating portion 314 of the solenoid near the shell 313 is connected to the shell 313. The length of the solenoid is set to be less than or equal to the length of the shell 313 to prevent the solenoid from affecting the connection between the measuring tube 31 and the branch pipe. In addition, the length of the coil 315 is also set to be less than or equal to the length of the permanent magnet 312. Since the permanent magnet 312 has a strong magnetic field, when the solution passes through the measuring tube 31, the ferromagnetic particles therein will be magnetized, thereby causing a change in the magnetic flux in the coil 315, so that a weak voltage is generated at both ends of the coil 315. Therefore, it is necessary to ensure that the coil 315 that can generate a change in magnetic flux is located within the range of the strong magnetic field generated by the permanent magnet 312.

[0052] like Figure 1 As shown, the filter element 32 is located after the measuring tube 31. The filter element 32 is mainly provided to capture ferromagnetic particles of different sizes. On the one hand, the captured ferromagnetic particles can be collected and disposed of in a centralized manner to prevent them from flowing back into the main pipeline 1 with the solution; on the other hand, the distribution positions of ferromagnetic particles of different sizes on the filter element 32 can be statistically analyzed to provide reference opinions for the arrangement of the solenoids in the permanent magnet tube (how to arrange the solenoids with different inner diameters).

[0053] like Figure 1 As shown, the first electrical module of this embodiment includes a first pump 21 and a first flowmeter 22, which are used together to control the flow rate, pressure and on-off time of the solution flowing from the first branch 2 to the measuring module; the second electrical module includes a second pump 41 and a second flowmeter 42, which are used together to control the flow rate, pressure and on-off time of the solution flowing from the second branch 3 to the outlet of the main pipeline 1. The first pump 21 and the second pump 41 can be used to control the circulation of the solution, and the first flowmeter 22 and the second flowmeter 42 can be used to control the flow rate of the solution.

[0054] like Figure 1As shown, the heat exchange module 5 of this embodiment includes a first heat exchanger 51, a second heat exchanger 52, a compressor 53 and an electric valve. The first heat exchanger 51 is located between the inlet of the main pipeline 1 and the first pump 21, the second heat exchanger 52 is located between the second pump 41 and the outlet of the main pipeline 1, and the compressor 53 and the electric valve are located between the first heat exchanger 51 and the second heat exchanger 52. The first heat exchanger 51, the electric valve, the second heat exchanger 52 and the compressor 53 are connected to form a closed loop. A first thermometer 54 is provided at one end of the first heat exchanger 51 close to the first pump 21, and a second thermometer 55 is provided at one end of the second heat exchanger 52 away from the second pump 41. When the temperature of the solution in the main pipeline 1 is higher than 100°C, the heat exchange module 5 needs to be turned on, refrigerant is added to the heat exchanger, and heat is converted between the first heat exchanger 51 and the second heat exchanger 52. The heat exchange module 5 is used to reduce the temperature of the solution flowing from the main pipeline 1 to the first pump 21 to less than 100°C, and heat the temperature of the solution flowing out of the second pump 41 to the same temperature as the solution in the main pipeline 1. When the temperature of the solution in the main pipeline is lower than 100°C, the heat exchange module 5 does not need to be turned on. The positions of the first thermometer 54 and the second thermometer 55 are set to more accurately monitor the temperature of the solution flowing to the first pump 21 and the temperature of the solution flowing out of the second pump 41 and merging into the main pipeline 1. When the temperature does not meet the requirements, the first pump 21 or the second pump 41 is kept closed to allow the solution to continue to cool or heat until the temperature reaches the standard, and then the pump can be turned on to allow the solution to circulate.

[0055] Example 2: Method for online measurement of ferromagnetic particle content in solution

[0056] The solution flowing in the main pipeline 1 passes through the first heat exchanger 51 from the entrance of the main pipeline 1, flows through the first electrical module, the measuring tube 31, the filter element 32, the second electrical module, and then passes through the second heat exchanger 52, and flows out from the outlet of the main pipeline 1. When the solution passes through the measuring tube 31, the ferromagnetic particles in the solution will be magnetized by the strong magnetic field generated by the permanent magnet 312, thereby causing the magnetic flux of the coil 315 in the solenoid to change, so that a weak back voltage is generated at both ends of the coil 315. Since the two connectors 316 of the coil 315 are connected to the measuring element, the weak voltage is captured and amplified by the measuring element, and the obtained voltage signal is recorded in real time and compared with the voltage signal calibration curve, the content of ferromagnetic particles in the solution can be obtained.

[0057] Example 3: Method for online measurement of ferromagnetic particle content in solution

[0058] After the connector 316 of the coil 315 is electrically connected to the measuring element, a pulsed current is passed through the measuring tube 31; the solution flowing in the main pipeline 1 passes through the first heat exchanger 51 from the inlet of the main pipeline 1, flows through the first electrical module, the measuring tube 31, the filter element 32, the second electrical module, and then passes through the second heat exchanger 52, and flows out from the outlet of the main pipeline 1; when the solution passes through the solenoid in the measuring tube 31, the ferromagnetic particles in the solution will cause the inductance of the coil 315 of the solenoid to increase, and the change in the inductance is recorded in real time and compared with the inductance signal calibration curve, so as to obtain the content of ferromagnetic particles in the solution.

[0059] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for online measurement of the content of ferromagnetic particles in a solution, the solution flowing in a main pipeline, characterized in that: The device comprises a branch pipeline and a measuring module located on the branch pipeline, and both ends of the branch pipeline are connected to the main pipeline; The measuring module includes a measuring tube and a filter element. The measuring tube includes a solenoid assembly. The solenoid assembly includes a permanent magnet tube and a plurality of solenoids located in the permanent magnet tube. The axial direction of the solenoid is parallel to the axial direction of the permanent magnet tube. A channel for the solution to flow is formed in the solenoid. The solenoid includes a coil and an insulating portion wrapped around the outside of the coil. Both ends of the coil include joints, wherein the joint at one end extends to the other end of the coil. The length of the insulating portion is greater than the length of the coil, and one end of the insulating portion is flush with one end of the coil. The inner diameter of the solenoid gradually increases from the center of the permanent magnet tube to the outside. Connecting material is filled between adjacent solenoids. The filter element is used to capture ferromagnetic particles.

2. The device according to claim 1, characterized in that The permanent magnet tube comprises a permanent magnet and a shell wrapped around the permanent magnet, and the insulating part of the solenoid close to the shell is connected to the shell; the length of the solenoid is less than or equal to the length of the shell.

3. The device according to claim 2, characterized in that The inner diameter of the solenoid is 2-10 mm, and the length of the coil is less than or equal to the length of the permanent magnet.

4. The device according to claim 2, characterized in that The material of the insulating part and the shell is the same as the connecting material.

5. The device according to claim 1, characterized in that The measuring tube comprises a tube body, the axial direction of the solenoid is parallel to the axial direction of the tube body, and the axial direction of the tube body is parallel to the flow direction of a solution flowing through the measuring tube.

6. The device according to claim 5, characterized in that A blocking portion is provided at one end of the tube body, the outer wall of the blocking portion is connected to the inner wall of the tube body, the end of the blocking portion is flush with the end of the tube body, and the blocking portion is used to place the solenoid assembly.

7. The device according to claim 1, characterized in that The measuring module further includes a measuring element, and the connector is electrically connected to the measuring element.

8. The device according to claim 1, characterized in that The branch pipeline includes a first branch, a second branch and a third branch connected in sequence, the first branch is located between the inlet of the main pipeline and the second branch, the third branch is located between the second branch and the outlet of the main pipeline, and the measurement module is located in the second branch.

9. The device according to claim 8, characterized in that It includes a first electrical module and a second electrical module respectively located in the first branch and the third branch; the first electrical module is used to control the flow, pressure and on-off time of the solution flowing from the first branch to the measuring module, and the second electrical module is used to control the flow, pressure and on-off time of the solution flowing from the second branch to the outlet of the main pipeline.

10. The device according to claim 9, characterized in that The first electrical module includes a first pump and a first flow meter, and the second electrical module includes a second pump and a second flow meter.

11. The device according to claim 10, characterized in that A cooling component is provided in the first branch, and a heating component is provided in the second branch. The cooling component is located between the main pipeline inlet and the first pump, and the heating component is located between the second pump and the main pipeline outlet.

12. The device according to claim 11, characterized in that A first thermometer is disposed at one end of the cooling component close to the first pump, and a second thermometer is disposed at one end of the heating component away from the second pump.

13. A method for online measuring the content of ferromagnetic particles in a solution using the device according to any one of claims 1 to 12, characterized in that: When the solution flows from the inlet of the main pipeline through the branch pipeline to the measuring tube, the magnetic flux in the solenoid changes, and a voltage is generated at both ends of the solenoid. The voltage value is recorded and compared with the voltage signal calibration curve to obtain the content of ferromagnetic particles.

14. A method for online measuring the content of ferromagnetic particles in a solution using the device according to any one of claims 1 to 12, characterized in that: A pulsed current is passed through the solenoid. When the solution passes through the solenoid, the inductance of the coil inside the solenoid increases. The inductance value is measured and recorded in real time, and compared with the inductance signal calibration curve to obtain the content of ferromagnetic particles.

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