Device for measuring flow rate of liquid lead bismuth

Abstract

Embodiments of the present application relate to the field of measuring flow of fluid, and particularly to a device for measuring flow of liquid lead bismuth, which comprises: a body part comprising a pipe for flowing liquid lead bismuth and a thermal insulation layer for insulating the liquid lead bismuth in the pipe; an electric signal generating assembly capable of generating a first electric signal and a second electric signal; a temperature measuring assembly for measuring the temperature of the liquid lead bismuth; a flow measuring assembly for determining the flow of the liquid lead bismuth according to the measured temperature and the first electric signal; a calibration signal obtaining assembly capable of obtaining a calibration signal according to the change of the contact resistance between the pipe and the liquid lead bismuth; and a calibration assembly for receiving the calibration signal and the second electric signal to calibrate the flow measuring assembly according to the calibration signal and the second electric signal. The measuring device provided by the embodiments of the present application can realize calibration without disassembly, which is conducive to simplifying the operation, reducing the time required for calibration, and improving the calibration efficiency.

Description

Technical Field

[0001] Embodiments of this application relate to the field of measuring fluid flow rate, and more specifically to a device for measuring the flow rate of liquid lead bismuth. Background Technology

[0002] The statements herein are provided merely as background information in connection with this application and do not necessarily constitute prior art.

[0003] Liquid lead bismuth is a commonly used coolant in reactors. The flow rate of liquid lead bismuth in the reactor affects its cooling performance. In order to effectively utilize liquid lead bismuth for reactor cooling, it is necessary to measure the flow rate of liquid lead bismuth.

[0004] Existing liquid metal flow measurement devices are mostly used to measure the flow rate of liquid sodium. Due to the strong corrosiveness, high density and low conductivity of liquid lead and bismuth, the measuring devices used to measure the flow rate of liquid sodium are not suitable for measuring the flow rate of liquid lead and bismuth.

[0005] Meanwhile, because liquid lead bismuth is highly corrosive and can dissolve and corrode structural materials, when using liquid lead bismuth as a coolant, the oxygen content in the liquid lead bismuth is usually controlled to form an oxide layer on the surface of the structural materials, reducing the dissolution and corrosion caused by the liquid lead bismuth. However, as the oxide layer changes with operating conditions and over time, it may peel off or break down, which may lead to inaccurate flow measurement results as operating conditions change and over time. Summary of the Invention

[0006] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0007] In related technologies, AC coil excitation is used to measure the flow rate of liquid lead bismuth, which can avoid the influence of liquid lead bismuth on the flow rate measurement due to material corrosion. However, calibration is not possible, which leads to inaccurate measurement results after long-term measurement.

[0008] In order to solve at least one of the above technical problems, embodiments of the present application provide a flow measurement device for liquid lead bismuth, which can include a body part, an electric signal generating assembly, a temperature measurement assembly, a flow measurement assembly, a calibration signal obtaining assembly and a calibration assembly. The body part includes a pipe for flowing liquid lead bismuth and a heat preservation layer arranged radially outside the pipe for heat preservation of the liquid lead bismuth in the pipe. The electric signal generating assembly is arranged radially outside the pipe and can generate a first electric signal and a second electric signal during the flowing of the liquid lead bismuth. The temperature measurement assembly is arranged in the heat preservation layer and extends out of the heat preservation layer for measuring the temperature of the liquid lead bismuth in the pipe. The flow measurement assembly is arranged outside the electric signal generating assembly, in communication with the temperature measurement assembly and electrically connected with the electric signal generating assembly, for determining the flow of the liquid lead bismuth according to the temperature measured by the temperature measurement assembly and the first electric signal generated by the electric signal generating assembly. The calibration signal obtaining assembly is arranged outside the electric signal generating assembly and can obtain a calibration signal according to the change of the contact resistance between the pipe and the liquid lead bismuth. The calibration assembly is electrically connected with the calibration signal obtaining assembly and the electric signal generating assembly, for receiving the calibration signal and the second electric signal generated by the electric signal generating assembly, so as to calibrate the flow measurement assembly according to the calibration signal and the second electric signal.

[0009] The flow measurement device provided by the embodiments of the present application can obtain the calibration signal through the calibration signal obtaining assembly, which is beneficial to improving the accuracy and timeliness of calibration. Meanwhile, the calibration assembly receives the calibration signal to calibrate the flow measurement assembly, so that calibration can be realized without disassembly, the disassembly process can be saved, which is beneficial to simplifying the operation, reducing the time required for calibration and improving the calibration efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0010] Other purposes and advantages of the present application will be apparent and can help to have a comprehensive understanding of the present application through the following description of the embodiments of the present application with reference to the accompanying drawings.

[0011] Figure 1 FIG. 1 is a structural schematic diagram of a flow measurement device for liquid lead bismuth provided by an embodiment of the present application.

[0012] DETAILED DESCRIPTION

[0013] 100, flow measurement device for liquid lead bismuth;

[0014] 10, body part; 11, pipe; 12, heat preservation layer;

[0015] 20, electric signal generating assembly; 21, magnetic assembly; 211, permanent magnet; 212, isolation piece; 22, electric signal generating piece; 221, measurement electrode pair; 222, calibration electrode pair; 223, turbulence generating piece;

[0016] 30 temperature measuring component; 31 heat collecting component; 32 temperature measuring component;

[0017] 40 flow measuring component; 50 calibration signal obtaining component; 60 calibration component.

[0018] It is to be noted that the drawings are not necessarily drawn to scale, but are merely intended to be illustrative. DETAILED DESCRIPTION

[0019] In the following, exemplary embodiments according to the application will be described with reference to the accompanying drawings. In the description of the exemplary embodiments, not all of the features of the actual implementation have been described in order to avoid obscuring the application with unnecessary detail. It should be appreciated, however, that numerous implementation-specific decisions can have to be made in order to develop any such actual implementation, and these specific decisions can vary from one implementation to another. Moreover, it should be appreciated that such a development effort might qualify for protection under the applicable intellectual property laws, and claims can be presented that encompass one or more implementations described herein and additional implementations that can be made without departing from and / or exceeding the scope of the application.

[0020] It is also to be noted that, in order to avoid obscuring the application with unnecessary detail, only those equipment structures and / or processing steps that are closely related to the solution according to the application have been shown in the drawings, while other details that are less relevant to the application have been omitted.

[0021] Reference is made to Figure 1Embodiments of the present application provide a flow measuring device 100 for liquid lead bismuth, which can include a body part 10, an electric signal generating assembly 20, a temperature measuring assembly 30, a flow measuring assembly 40, a calibration signal obtaining assembly 50 and a calibration assembly 60. The body part 10 includes a pipe 11 for flowing liquid lead bismuth and a thermal insulation layer 12 arranged radially outside the pipe 11 for thermal insulation of the liquid lead bismuth in the pipe 11; the electric signal generating assembly 20 is arranged radially outside the pipe 11 and can generate a first electric signal and a second electric signal during the flowing of the liquid lead bismuth; the temperature measuring assembly 30 is arranged in the thermal insulation layer 12 and extends outside the thermal insulation layer 12 for measuring the temperature of the liquid lead bismuth in the pipe 11; the flow measuring assembly 40 is arranged outside the electric signal generating assembly 20 and electrically connected with the temperature measuring assembly 30 and the electric signal generating assembly 20, for determining the flow of the liquid lead bismuth according to the temperature measured by the temperature measuring assembly 30 and the first electric signal generated by the electric signal generating assembly 20; the calibration signal obtaining assembly 50 is arranged outside the electric signal generating assembly 20 and can obtain a calibration signal according to the change of the contact resistance between the pipe 11 and the liquid lead bismuth; and the calibration assembly 60 is electrically connected with the calibration signal obtaining assembly 50 and the electric signal generating assembly 20, for receiving the calibration signal and the second electric signal generated by the electric signal generating assembly 20, so as to calibrate the flow measuring assembly 40 according to the calibration signal and the second electric signal.

[0022] The measuring device 100 provided by the embodiments of the present application can obtain the calibration signal through the calibration signal obtaining assembly 50, which is beneficial to improving the accuracy and timeliness of calibration; at the same time, the calibration assembly 60 receives the calibration signal to calibrate the flow measuring assembly 40, so that calibration can be realized without disassembly, which can save the disassembly process, is beneficial to simplifying the operation, reducing the time required for calibration, and improving the calibration efficiency.

[0023] In some embodiments, the measuring device 100 can also be used to measure the flow of liquid sodium, liquid sodium potassium, liquid lithium and other liquid metals.

[0024] Referring to Figure 1In some embodiments, the electric signal generating assembly 20 can include a magnetic assembly 21 and an electric signal generating piece 22. The magnetic assembly 21 is arranged at the radial outer side of the heat preservation layer 12 and is capable of generating a magnetic field. When the liquid lead bismuth flows in the pipe 11, the liquid lead bismuth is capable of cutting the magnetic force lines of the magnetic field generated by the magnetic assembly 21. The electric signal generating piece 22 is arranged in the heat preservation layer 12. When the liquid lead bismuth cuts the magnetic force lines of the magnetic field generated by the magnetic assembly 21, the electric signal generating piece 22 generates a first electric signal and a second electric signal. The flow measurement assembly 40 and the calibration signal obtaining assembly 50 are arranged at the outer side of the magnetic assembly 21, and the calibration assembly 60 is electrically connected with the electric signal generating piece 22. In such embodiments, the magnetic force lines of the magnetic field generated by the magnetic assembly 21 can be cut by the liquid lead bismuth to generate the first electric signal and the second electric signal in the electric signal generating piece 22, so that the flow can be measured by the first electric signal and the flow can be calibrated by the second electric signal.

[0025] In some embodiments, the first electric signal and the second electric signal can be induced electromotive force. The first electric signal is proportional to the flow rate, so that the flow rate of the liquid lead bismuth can be determined by the first electric signal, and the flow of the liquid lead bismuth can be determined.

[0026] Referring to Figure 1 In some embodiments, the electric signal generating piece 22 can include two pairs of measuring electrodes 221 and two pairs of calibration electrodes 222. The two pairs of measuring electrodes 221 are respectively arranged at the radial inner side of the magnetic assembly 21, and the first electric signal can be generated on the two pairs of measuring electrodes 221. The two pairs of calibration electrodes 222 are respectively arranged at the radial inner side of the magnetic assembly 21, and the second electric signal can be generated on the two pairs of calibration electrodes 222. Each of the two electrodes in each of the two pairs of measuring electrodes 221 is symmetrically arranged along the axial direction of the pipe 11, and each of the two electrodes in each of the two pairs of calibration electrodes 222 is also symmetrically arranged along the axial direction of the pipe 11. The two electrodes in each of the two pairs of measuring electrodes 221 and the two electrodes in each of the two pairs of calibration electrodes 222 are staggered in the circumferential direction of the pipe 11. In such embodiments, the two pairs of measuring electrodes 221, the two pairs of calibration electrodes 222, and the two pairs of measuring electrodes 221 and the two pairs of calibration electrodes 222 are staggered, which can avoid mutual interference of the electrode pairs, and thus is conducive to ensuring the accuracy of the electric signals generated on the electrode pairs.

[0027] In some embodiments, the two pairs of measuring electrodes 221 are located at positions perpendicular to the direction of motion of the liquid lead bismuth and the direction of the magnetic force lines. In some embodiments, the magnetic assembly 21 arranged at the radial outer side of the heat preservation layer 12 is capable of generating a magnetic field perpendicular to the pipe 11. When the liquid lead bismuth flows in the pipe 11, the liquid lead bismuth is capable of cutting the magnetic force lines, and an induced electromotive force proportional to the flow rate is generated on the two pairs of measuring electrodes 221.

[0028] In some embodiments, the two pairs of measuring electrodes 221, the two pairs of calibration electrodes 222 and the pipe 11 are made of the same material, so that the measuring electrodes 221, the calibration electrodes 222 and the pipe 11 have the same heat transfer rate, and temperature difference between the measuring electrodes 221, the calibration electrodes 222 or the pipe 11 is avoided, which is conducive to reducing additional electromotive force caused by temperature difference, and conducive to ensuring the accuracy of the first electric signal and the second electric signal, and further conducive to ensuring the accuracy of the measurement result of the flow rate of the liquid lead-bismuth.

[0029] Referring to Figure 1 In some embodiments, the electric signal generator 22 can further include a turbulent flow generator 223 arranged on the inner wall of the pipe 11 near the inlet of the liquid lead-bismuth, for generating a turbulent vortex signal in the liquid lead-bismuth, which can cut the magnetic lines of the magnetic field generated by the two permanent magnets 211 when flowing, so that the second electric signal is generated on the two pairs of calibration electrodes 222.

[0030] In such embodiments, the turbulent vortex signal generated in the liquid lead-bismuth by the turbulent flow generator 223 enables the second electric signal for calibrating the flow rate of the liquid lead-bismuth to be generated on the two pairs of calibration electrodes 222, and further enables the calibration assembly 60 to calibrate the flow rate of the liquid lead-bismuth according to the second electric signal.

[0031] In some embodiments, the turbulent flow generator 223 can have a fan-shaped structure with a height of one-third of the inner diameter of the pipe 11, so as to generate the turbulent vortex signal in the liquid lead-bismuth.

[0032] In some embodiments, the turbulent vortex signal generated in the liquid lead-bismuth by the turbulent flow generator 223 can cut the magnetic field generated by the two permanent magnets 211, and an induced electromotive force (i.e. the second electric signal) is generated on the two pairs of calibration electrodes 222. The induced electromotive force generated on the two pairs of calibration electrodes 222 has a time interval, which is the transmission time of the turbulent vortex signal in the pipe 11; by sending the induced electromotive force generated on the two pairs of calibration electrodes 222 to the calibration assembly 60, the calibration of the flow rate is performed.

[0033] Referring to Figure 1 In some embodiments, the magnetic assembly 21 can include two permanent magnets 211 with the same structure, arranged on the radially outer side of the heat preservation layer 12, one permanent magnet 211 being located downstream of the other permanent magnet 211, and the distance between the two permanent magnets 211 being 2-5 times of the inner diameter of the pipe 11; wherein the flow rate measurement assembly 40 and the calibration signal obtaining assembly 50 are arranged on the outer side of the two permanent magnets 211. In such embodiments, it is conducive to making the turbulent vortex signal develop sufficiently to be stable.

[0034] Referring to Figure 1In some embodiments, two pairs of measuring electrodes 221 are arranged near the two permanent magnets 211 respectively, and two pairs of calibration electrodes 222 are arranged on the outer side of the two permanent magnets 211 along the axis of the pipe 11. In some embodiments, each permanent magnet 211 can include a permanent magnet segment and a magnetic conductive segment connected to each other, the permanent magnet segment is made of cast aluminum-nickel-cobalt permanent magnet alloy material, and the magnetic conductive segment is made of electromagnetic pure iron material. Since the temperature of liquid lead-bismuth can reach 200-500°C or even higher during the operation of the reactor, in such embodiments, the cast aluminum-nickel-cobalt permanent magnet material has the characteristics of high stability, high temperature resistance, and radiation resistance, and can be used for a long time at a temperature as high as 550°C, and can realize long-term measurement of the flow of liquid lead-bismuth.

[0035] In some embodiments, the heat preservation layer 12 arranged on the radial outer side of the pipe 11 can not only reduce the energy loss of the liquid lead-bismuth due to heat dissipation, but also reduce the temperature of the environment where the two permanent magnets 211 are located, so that the two permanent magnets 211 can still work normally when the temperature of the liquid lead-bismuth is as high as 200-500°C.

[0036] In some embodiments, the distance between the turbulence generator 223 and the upstream permanent magnet 211 is greater than or equal to 4 times the inner diameter of the pipe 11. In such embodiments, it is also beneficial to make the turbulent vortex signal fully developed to be stable.

[0037] In some embodiments, the calibration signal obtaining assembly 50 can include a constant current power supply, a measuring resistor, a voltage measuring element, a threshold comparison unit, and a calibration signal output element. The constant current power supply is arranged to be electrically connected to the side wall of the pipe 11, for applying a constant voltage to the side wall of the pipe 11; the measuring resistor is connected in series with the constant current power supply and the side wall of the pipe 11, when the contact resistance between the pipe 11 and the liquid lead-bismuth changes, the voltage across the measuring resistor also changes; the voltage measuring element is connected in parallel with the measuring resistor, for measuring the changed voltage across the measuring resistor; the threshold comparison unit is in communication connection with the voltage measuring element, for comparing the voltage measured by the voltage measuring element with a reference voltage, and outputting a comparison signal; the calibration signal output element is in communication connection with the threshold comparison unit, for determining the calibration signal according to the comparison signal output by the threshold comparison unit. In such embodiments, the voltage measured by the voltage measuring element can be compared with the reference voltage to determine whether the contact resistance between the pipe 11 and the liquid lead-bismuth changes, and then determine whether calibration is needed and the calibration signal.

[0038] In order to avoid corrosion of the pipe 11 caused by the liquid lead bismuth, a protective oxide film is formed between the liquid lead bismuth and the pipe 11. However, with the change of the operating condition and the increase of the operating time, the protective oxide film between the liquid lead bismuth and the pipe 11 may be peeled off or damaged, resulting in the change of the contact resistance between the liquid lead bismuth and the pipe 11. The change of the contact resistance between the liquid lead bismuth and the pipe 11 indicates the change of the solid-liquid interface characteristics inside the pipe 11, which affects the accuracy of the measurement result of the flow rate of the liquid lead bismuth. Therefore, the flow rate measured by the flow measurement assembly 40 needs to be calibrated.

[0039] In some embodiments, the voltage measurement member and the calibration signal output member can both be circuits. In some embodiments, the reference voltage is related to the temperature of the liquid lead bismuth. The reference voltage can be determined by measurement when the measurement device 100 is just started to operate stably.

[0040] In some embodiments, even if the voltage measured by the voltage measurement member does not exceed the reference voltage, the flow rate result measured by the flow measurement assembly 40 still needs to be calibrated considering the possibility of demagnetization of the permanent magnets 211 due to the effects of irradiation, thermal radiation and time lapse. In this case, the calibration can be performed at a fixed period.

[0041] Referring to Figure 1 In some embodiments, the magnetic assembly 21 can further include an isolation member 212 arranged between the flow measurement assembly 40 and the two permanent magnets 211 for isolating the flow measurement assembly 40 from the two permanent magnets 211. The isolation member 212 is made of ferromagnetic material. In such embodiments, the electromagnetic interference caused by the constant current power supply can be isolated.

[0042] In some embodiments, the distance between the isolation member 212 and the two permanent magnets 211 is greater than or equal to 200 mm. In such embodiments, it is beneficial to avoid the influence of the magnetic field of the second permanent magnet 211 on the isolation member 212 made of ferromagnetic material.

[0043] Referring to Figure 1 In some embodiments, the temperature measurement assembly 30 can include a heat collecting member 31 and a temperature measuring member 32. The heat collecting member 31 is arranged in the heat preservation layer 12 for collecting heat. The temperature measuring member 32 is fixedly connected with the heat collecting member 31. The temperature measuring member 32 is partially arranged in the heat preservation layer 12 and extends out of the heat preservation layer 12 for measuring the temperature of the liquid lead bismuth in the pipe 11. In such embodiments, the heat collecting member 31 collects heat, and the temperature measuring member 32 is fixedly connected with the heat collecting member 31, which is beneficial to ensure the accuracy of the temperature measurement of the temperature measuring member 32, and further beneficial to ensure the accuracy of the measurement of the flow rate of the liquid lead bismuth.

[0044] In some embodiments, the heat collecting piece 31 can be a stainless steel heat collecting block. In some embodiments, the temperature measuring piece 32 can be an armored thermocouple fixedly connected with the heat collecting piece 31 by welding or crimping.

[0045] In some embodiments, the temperature measuring elements of the heat collecting piece 31 and the temperature measuring piece 32 are arranged in the heat preservation layer 12 at the same time, so as to ensure the accurate measurement of the temperature of the liquid lead bismuth. In some embodiments, the temperature signal measured by the temperature measuring piece 32 can be sent to the flow measurement assembly 40, the calibration assembly 60 and the calibration signal obtaining assembly 50, for correction or calling of the temperature related parameters.

[0046] In some embodiments, the temperature signal measured by the temperature measuring piece 32 can be sent to the threshold comparison unit of the calibration signal obtaining assembly 50.

[0047] In some embodiments, the calibration assembly 60 can determine the calibration coefficient according to the received calibration signal and the two second electric signals generated on the two calibration electrode pairs 222, and can input the calibration coefficient to the flow measurement assembly 40 to calibrate the flow measurement assembly 40.

[0048] In some embodiments, the calibration assembly 60 includes a second electric signal processing module, a temperature signal processing module, a signal acquisition module, a calibration coefficient determining piece, a power supply and a portable box.

[0049] The second electric signal processing module is electrically connected with the two calibration electrode pairs 222, for receiving the two second electric signals generated by the two calibration electrode pairs 222, and for amplifying and filtering the two second electric signals, and the processed two second electric signals are sent to the signal acquisition module.

[0050] The temperature signal processing module is electrically connected with the temperature measuring piece 32, for receiving the temperature signal measured by the temperature measuring piece 32, and for cold end compensation, amplification and filtering of the temperature signal, and the processed temperature signal is also sent to the signal acquisition module.

[0051] The signal acquisition module is electrically connected with the second electric signal processing module and the temperature signal processing module, for receiving the second electric signal processed by the second electric signal processing module and the temperature signal processed by the temperature signal processing module, and for digital conversion and digital filtering of the received second electric signal and temperature signal, to obtain a cross-correlation signal.

[0052] The calibration coefficient determining member is electrically connected with the signal collecting module, and is configured to receive the cross-correlation signal obtained by the signal collecting module, and perform calculation, analysis, storage and human-computer interaction on the received cross-correlation signal to determine the calibration coefficient. The power supply is electrically connected with the second electric signal processing module, the temperature signal processing module, the signal collecting module and the calibration coefficient determining member, and is configured to supply power for the second electric signal processing module, the temperature signal processing module, the signal collecting module and the calibration coefficient determining member; the second electric signal processing module, the temperature signal processing module, the signal collecting module, the calibration coefficient determining member and the power supply are integrally arranged in the portable box.

[0053] In some embodiments, the signal collecting module can compensate and correct the second electric signal according to the temperature signal measured by the temperature measuring member 32 to determine a standard second electric signal linearly related to the flow of the liquid lead-bismuth at different temperatures of the liquid lead-bismuth, and determine the flow of the liquid lead-bismuth according to the standard second electric signal. In some embodiments, the range of the standard second electric signal is 4-20 mA.

[0054] In some embodiments, the flow measurement assembly 40 can include a first electric signal detecting and isolating member, a temperature signal detecting and processing member, a signal processing member and a data analyzing member. The first electric signal detecting and isolating member is configured to receive the first electric signal generated on the measuring electrode pair 221 and process the received first electric signal; the temperature signal detecting and processing member is configured to receive the temperature signal measured by the temperature measuring member 32 and process the received temperature signal; the signal processing member is configured to receive the first electric signal processed by the first electric signal detecting and isolating member and the temperature signal processed by the temperature signal detecting and processing member, and process the received first electric signal and temperature signal to obtain a measurement signal; and the data analyzing member is configured to receive the measurement signal and the calibration coefficient, and determine the flow of the calibrated liquid lead-bismuth according to the measurement signal and the calibration coefficient.

[0055] In some embodiments, the flow measurement assembly 40 can further include a two-wire power supply member, a V / I conversion member, a power supply and a human-computer interaction member.

[0056] In some embodiments, the flow of the liquid lead-bismuth can be determined according to the first electric signal generated on the measuring electrode pair 221, and then the flow of the liquid lead-bismuth can be determined. In some embodiments, the flow measurement assembly 40 can compensate and correct the first electric signal according to the temperature signal measured by the temperature measuring member 32 to determine a standard first electric signal linearly related to the flow of the liquid lead-bismuth at different temperatures of the liquid lead-bismuth, and determine the flow of the liquid lead-bismuth according to the standard first electric signal. In some embodiments, the range of the standard first electric signal is 4-20 mA.

[0057] Specifically, according to the principle of Faraday's law of electromagnetic induction, the magnitude of the first electric signal (induced electromotive force) E generated on the measuring electrode pair 221 satisfies the following expression:

[0058]

[0059] In the above expression, B represents the magnetic flux density on the cross section of the pipe 11, with the unit of T; d represents the inner diameter of the pipe 11, with the unit of m; represents the flow rate of the liquid lead-bismuth.

[0060] According to the above expression, the volume flow rate Q of the liquid lead-bismuth in the pipe 11 satisfies the following expression:

[0061]

[0062] With the increase of the temperature of the liquid lead-bismuth, the magnetic flux density of the permanent magnet 211 decreases, the thermal expansion of the pipe and the diversion effect of the pipe wall also decrease, which in turn causes the decrease of the first electric signal (induced electromotive force E). Therefore, the temperature of the liquid lead-bismuth is measured by the temperature measuring piece 32, and the measured temperature signal is sent to the flow measurement assembly 40 for compensation correction, so as to compensate the instability of the first electric signal caused by the temperature change of the liquid lead-bismuth, and ensure accurate measurement in the whole temperature range.

[0063] In some embodiments, the calibration assembly 60 can calibrate the flow measurement unit online. In some embodiments, the calibration assembly 60 can calibrate online based on the cross-correlation flow measurement principle, which is not affected by irradiation, thermal cycling and time elapse, and has high accuracy.

[0064] In some embodiments, the two second electric signals generated on the two pairs of calibration electrodes 222 are sent to the calibration assembly 60, and the cross-correlation function peak value corresponding time of the two second electric signals, i.e. the transmission time τ of the turbulent vortex signal in the pipe 11, is calculated by using the cross-correlation analysis method. When the distance between the two permanent magnets 211 is determined, the transmission time τ is inversely proportional to the flow rate of the liquid lead-bismuth; the flow rate of the liquid lead-bismuth is calibrated by the transmission time τ, and then the flow of the liquid lead-bismuth is calibrated.

[0065] Specifically, the calibration coefficient K satisfies the following expression:

[0066]

[0067] In the above expression, Q1 is the measured flow rate of the liquid lead-bismuth for calibration determined by the data analysis piece, and Q2 is the calibration flow rate of the liquid lead-bismuth for calibration determined by the signal acquisition module; wherein the calibration flow rate Q2 of the liquid lead-bismuth for calibration determined by the signal acquisition module satisfies the following expression:

[0068]

[0069] In the above expression, s is the cross-sectional area of the pipe 11, v is the flow rate of the calibrated liquid lead bismuth, and L is the distance between the two permanent magnets 211.

[0070] The flow rate of the calibrated liquid lead bismuth satisfies the following expression:

[0071]

[0072] In the above expression, Q S is the actual flow rate of the liquid lead bismuth, Q C is the flow rate of the liquid lead bismuth determined by the data analysis device for measurement.

[0073] For the embodiments of the present application, it also needs to be explained that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0074] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto, and the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A flow rate measuring device for liquid lead bismuth, characterized by, include: The main body includes a pipe and an insulation layer. The pipe is used to supply liquid lead-bismuth flow, and the insulation layer is disposed on the radially outer side of the pipe to keep the liquid lead-bismuth in the pipe warm. An electrical signal generating component is disposed on the radial outer side of the pipe fitting. During the flow of liquid lead-bismuth, the electrical signal generating component can generate a first electrical signal and a second electrical signal. A temperature measuring component is disposed in the insulation layer and extends outside the insulation layer for measuring the temperature of liquid lead-bismuth inside the pipe fitting; A flow measurement component is disposed outside the electrical signal generating component and electrically connected to the temperature measurement component and the electrical signal generating component, and is used to determine the flow rate of liquid lead bismuth based on the temperature measured by the temperature measurement component and the first electrical signal generated by the electrical signal generating component; A calibration signal acquisition component is disposed outside the electrical signal generation component and is capable of acquiring a calibration signal based on the change in contact resistance between the tube and the liquid lead bismuth. A calibration component, electrically connected to the calibration signal acquisition component and the electrical signal generation component, is used to receive a calibration signal and a second electrical signal generated by the electrical signal generation component, so as to calibrate the flow measurement component according to the calibration signal and the second electrical signal.

2. The measuring device of claim 1, wherein, The electrical signal generating component includes: A magnetic component, disposed on the radial outer side of the insulation layer, is capable of generating a magnetic field. When liquid lead-bismuth flows inside the pipe, it can cut the magnetic lines of force of the magnetic field generated by the magnetic component. An electrical signal generating element is disposed within the insulation layer. When liquid lead-bismuth cuts the magnetic field lines generated by the magnetic component, the electrical signal generating element generates a first electrical signal and a second electrical signal. The flow measurement component and the calibration signal acquisition component are disposed outside the magnetic component, and the calibration component is electrically connected to the electrical signal generating component.

3. The measuring device of claim 2, wherein, The electrical signal generating device includes: Two measuring electrode pairs are respectively disposed on the radial inner side of the magnetic component, and the two measuring electrode pairs are capable of generating a first electrical signal; Two calibration electrode pairs are respectively disposed on the radial inner side of the magnetic component, and the two calibration electrode pairs are capable of generating a second electrical signal; In each of the measuring electrode pairs, the two electrodes are symmetrically arranged along the axial direction of the pipe fitting, and in each of the calibration electrode pairs, the two electrodes are also symmetrically arranged along the axial direction of the pipe fitting. The two electrodes in each of the measuring electrode pairs are offset from the two electrodes in each of the calibration electrode pairs in the circumferential direction of the fitting.

4. The measuring device of claim 3, wherein, The magnetic component includes: Two permanent magnets with identical structures are disposed on the radial outer side of the insulation layer, with one permanent magnet located downstream of the other, and the distance between the two permanent magnets being 2 to 5 times the inner diameter of the pipe fitting; The flow measurement component and the calibration signal acquisition component are located on the outside of the two permanent magnets.

5. The measuring device of claim 4, wherein, The electrical signal generating device further includes: A turbulence generator is arranged on the inner wall of the pipe near the inlet of the liquid lead-bismuth, and is used to generate a turbulent vortex signal in the liquid lead-bismuth. When flowing, the turbulent vortex signal can cut the magnetic force lines of the magnetic field generated by the two permanent magnets, so as to generate a second electric signal on the two calibration electrodes.

6. The measuring device of claim 5, wherein, The distance between the turbulence generator and the upstream permanent magnet is greater than or equal to 4 times the inner diameter of the pipe.

7. The measuring device of claim 1, wherein, The calibration signal obtaining assembly comprises: A constant current power supply is arranged in electrical connection with the side wall of the pipe, and is used to apply a constant voltage to the side wall of the pipe; A measuring resistor is connected in series with the constant current power supply and the side wall of the pipe. When the contact resistance between the pipe and the liquid lead-bismuth changes, the voltage across the measuring resistor changes accordingly; A voltage measuring element is connected in parallel with the measuring resistor, and is used to measure the changed voltage across the measuring resistor; A threshold comparison unit is in communication connection with the voltage measuring element, and is used to compare the voltage measured by the voltage measuring element with a reference voltage, and output a comparison signal; A calibration signal output element is in communication connection with the threshold comparison unit, and is used to determine a calibration signal according to the comparison signal output by the threshold comparison unit.

8. The measuring device of claim 5, wherein, The magnetic assembly further comprises: An isolation element is arranged between the calibration signal obtaining assembly and the two permanent magnets, and is used to isolate the calibration signal obtaining assembly from the two permanent magnets, The isolation element is made of a ferromagnetic material.

9. The measuring device of claim 8, wherein, The distance between the isolation element and the two permanent magnets is greater than or equal to 200 mm.

10. The measuring device of claim 1, wherein, The temperature measuring assembly comprises: A heat collecting element is arranged in the heat preservation layer, and is used to collect heat; A temperature measuring element is fixedly connected with the heat collecting element. The temperature measuring element is partially arranged in the heat preservation layer, and extends out of the heat preservation layer, and is used to measure the temperature of the liquid lead-bismuth in the pipe.

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