Device for measuring flow of liquid lead bismuth

Abstract

The embodiment of the invention relates to the field of fluid flow measurement, in particular to a device for measuring the flow of liquid lead bismuth, which comprises a body part comprising a pipe fitting and a thermal insulation layer, the pipe fitting is used for the flowing of the liquid lead bismuth, and the thermal insulation layer is used for the thermal insulation of the liquid lead bismuth in the pipe fitting; the electric signal generation assembly can generate a first electric signal and a second electric signal; the temperature measuring assembly is used for measuring the temperature of the liquid lead bismuth; the flow measuring assembly is used for determining the flow of the liquid lead bismuth according to the measured temperature and the first electric signal; the calibration signal obtaining assembly can obtain a calibration signal according to the change of the contact resistance between the pipe fitting and the liquid lead bismuth; and the calibration assembly is used for receiving the calibration signal and the second electric signal so as to calibrate the flow measurement assembly according to the calibration signal and the second electric signal. According to the measuring device provided by the embodiment of the invention, calibration can be realized without disassembly and assembly, operation simplification is facilitated, the time required by calibration is shortened, and the calibration efficiency is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of measuring fluid flow, and specifically to a device for measuring the flow of liquid lead and bismuth. Background Art

[0002] The statements herein merely provide background information related to the present 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 own cooling performance. In order to effectively use liquid lead-bismuth to cool the reactor, 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 of liquid sodium. Since liquid lead and bismuth have strong corrosiveness, high density and low electrical conductivity, the measurement device used to measure the flow of liquid sodium is not suitable for measuring the flow of liquid lead and bismuth.

[0005] At the same time, since liquid lead-bismuth is highly corrosive and will 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 material to reduce the dissolution and corrosion of the structural material by the liquid lead-bismuth. However, as the oxide layer changes with the working conditions and the passage of time, it will peel off or break, which may cause the flow measurement results to be inaccurate as the working conditions change and the passage of time. Summary of the invention

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

[0007] In the related art, AC coil excitation is used to measure the flow rate of liquid lead-bismuth, which can avoid the impact of liquid lead-bismuth corrosion on the flow rate measurement of liquid lead-bismuth, but it cannot be calibrated, resulting in inaccurate measurement results after long-term measurement.

[0008] In response to at least one aspect of the above technical problems, an embodiment of the present application provides a device for measuring the flow rate of liquid lead-bismuth (hereinafter referred to as the measuring device), which may include a main body, an electrical signal generating component, a temperature measuring component, a flow measuring component, a calibration signal obtaining component and a calibration component. The main body includes a pipe and an insulation layer. The pipe is used for liquid lead bismuth to flow. The insulation layer is arranged on the radial outside of the pipe to insulate the liquid lead bismuth in the pipe; the electric signal generating component is arranged on the radial outside of the pipe, and during the flow of liquid lead bismuth, the electric signal generating component can generate a first electric signal and a second electric signal; the temperature measuring component is arranged in the insulation layer and extends outside the insulation layer, and is used to measure the temperature of the liquid lead bismuth in the pipe; the flow measuring component is arranged on the outside of the electric signal generating component, communicates with the temperature measuring component and is electrically connected to the electric signal generating component, and is used to determine the flow of liquid lead bismuth according to the temperature measured by the temperature measuring component and the first electric signal generated by the electric signal generating component; the calibration signal obtaining component is arranged on the outside of the electric signal generating component, and can obtain a calibration signal according to the change of the contact resistance between the pipe and the liquid lead bismuth; the calibration component is electrically connected to the calibration signal obtaining component and the electric signal generating component, and is used to receive the calibration signal and the second electric signal generated by the electric signal generating component, so as to calibrate the flow measuring component according to the calibration signal and the second electric signal.

[0009] The measuring device provided in the embodiment of the present application can obtain a calibration signal through a calibration signal acquisition component, which is beneficial to improving the accuracy and timeliness of calibration; at the same time, the calibration signal is received by the calibration component to calibrate the flow measurement component, so that calibration can be achieved without disassembly and assembly, which can save the disassembly and assembly process, is beneficial to simplifying the operation, reducing the time required for calibration, and improving the calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the present application.

[0011] Figure 1 It is a schematic diagram of the structure of a device for measuring the flow rate of liquid lead and bismuth provided in an embodiment of the present application.

[0012] Description of reference numerals:

[0013] 100. Device for measuring the flow rate of liquid lead and bismuth;

[0014] 10. Main body; 11. Pipe fittings; 12. Insulation layer;

[0015] 20. Electric signal generating component; 21. Magnetic component; 211. Permanent magnet; 212. Isolation component; 22. Electric signal generating component; 221. Measuring electrode pair; 222. Calibration electrode pair; 223. Turbulence generating component;

[0016] 30. Temperature measurement component; 31. Heat collecting component; 32. Temperature measuring component;

[0017] 40. Flow measurement component; 50. Calibration signal acquisition component; 60. Calibration component.

[0018] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION

[0019] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0020] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0021] See also Figure 1The embodiment of the present application provides a device 100 for measuring the flow of liquid lead-bismuth (hereinafter referred to as the measuring device 100, the flow mentioned here and below refers to the volume flow of liquid lead-bismuth), which may include a main body 10, an electrical signal generating component 20, a temperature measuring component 30, a flow measuring component 40, a calibration signal obtaining component 50 and a calibration component 60. The main body 10 includes a pipe 11 and an insulation layer 12. The pipe 11 is used for liquid lead-bismuth to flow. The insulation layer 12 is arranged on the radial outer side of the pipe 11 to insulate the liquid lead-bismuth in the pipe 11; the electrical signal generating component 20 is arranged on the radial outer side of the pipe 11. During the flow of liquid lead-bismuth, the electrical signal generating component 20 can generate a first electrical signal and a second electrical signal; the temperature measuring component 30 is arranged on the insulation layer 12 and extends outside the insulation layer 12 to measure the temperature of the liquid lead-bismuth in the pipe 11; the flow measuring component 40 is arranged on the outer side of the electrical signal generating component 20 and is in contact with the temperature measuring component 30. 0 is electrically connected to the electric signal generating component 20, and is used to determine the flow rate of liquid lead bismuth according to the temperature measured by the temperature measuring component 30 and the first electric signal generated by the electric signal generating component 20; the calibration signal obtaining component 50 is arranged on the outside of the electric signal generating component 20, and can obtain the calibration signal according to the change of the contact resistance between the pipe 11 and the liquid lead bismuth; the calibration component 60 is electrically connected to the calibration signal obtaining component 50 and the electric signal generating component 20, and is used to receive the calibration signal and the second electric signal generated by the electric signal generating component 20, so as to calibrate the flow measurement component 40 according to the calibration signal and the second electric signal.

[0022] The measuring device 100 provided in the embodiment of the present application can obtain a calibration signal through the calibration signal acquisition component 50, which is beneficial to improving the accuracy and timeliness of the calibration; at the same time, the calibration signal is received by the calibration component 60 to calibrate the flow measurement component 40, so that calibration can be achieved without disassembly and assembly, which can save the disassembly and assembly 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 rate of other liquid metals such as liquid sodium, liquid sodium potassium, and liquid lithium.

[0024] See also Figure 1In some embodiments, the electric signal generating component 20 may include a magnetic component 21 and an electric signal generating member 22. The magnetic component 21 is arranged radially outside the thermal insulation layer 12, and can generate a magnetic field. When the liquid lead bismuth flows in the pipe 11, it can cut the magnetic force lines of the magnetic field generated by the magnetic component 21; the electric signal generating member 22 is arranged in the thermal insulation layer 12, and when the liquid lead bismuth cuts the magnetic force lines of the magnetic field generated by the magnetic component 21, the electric signal generating member 22 generates a first electric signal and a second electric signal; wherein the flow measurement component 40 and the calibration signal obtaining component 50 are arranged outside the magnetic component 21, and the calibration component 60 is electrically connected to the electric signal generating member 22. In such an embodiment, the magnetic force lines of the magnetic field generated by the magnetic component 21 can be cut by the liquid lead bismuth, so as to generate the first electric signal and the second electric signal in the electric signal generating member 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 electrical signal and the second electrical signal may be induced electromotive force, and the first electrical signal is proportional to the flow rate, so that the flow rate of the liquid lead-bismuth can be determined by the first electrical signal, and thus the flow rate of the liquid lead-bismuth can be determined.

[0026] See also Figure 1 In some embodiments, the electrical signal generating element 22 may include two measuring electrode pairs 221 and two calibration electrode pairs 222. The two measuring electrode pairs 221 are respectively arranged on the radial inner side of the magnetic component 21, and the first electrical signal can be generated on the two measuring electrode pairs 221; the two calibration electrode pairs 222 are respectively arranged on the radial inner side of the magnetic component 21, and the second electrical signal can be generated on the two calibration electrode pairs 222; wherein, the two electrodes in each measuring electrode pair 221 are symmetrically arranged along the axial direction of the pipe 11, and the two electrodes in each calibration electrode pair 222 are also symmetrically arranged along the axial direction of the pipe 11, and the two electrodes in each measuring electrode pair 221 and the two electrodes in each calibration electrode pair 222 are staggered in the circumferential direction of the pipe 11. In such an embodiment, the two measuring electrode pairs 221, the two calibration electrode pairs 222, and the measuring electrode pairs 221 and the calibration electrode pairs 222 are all staggered, which can avoid mutual interference between the electrode pairs, thereby facilitating the accuracy of the electrical signals generated on each electrode pair.

[0027] In some embodiments, the two measuring electrode pairs 221 are located at a position perpendicular to the direction of movement of the liquid lead-bismuth and the direction of the magnetic field lines. In some embodiments, the magnetic component 21 disposed radially outside the thermal insulation layer 12 can generate a magnetic field perpendicular to the pipe 11, and the liquid lead-bismuth can cut the magnetic field lines when flowing in the pipe 11, generating an induced electromotive force proportional to the flow velocity on the two measuring electrode pairs 221.

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

[0029] See also Figure 1 In some embodiments, the electrical signal generating component 22 may further include a turbulence generating component 223, which is arranged on the inner wall of the tube 11 near the inlet of the liquid lead-bismuth, and is used to generate a turbulent vortex signal in the liquid lead-bismuth. When the turbulent vortex signal flows, it can cut the magnetic lines of force of the magnetic field generated by the two permanent magnets 211, thereby generating a second electrical signal on the two calibration electrode pairs 222.

[0030] In such an embodiment, a turbulent vortex signal is generated in the liquid lead-bismuth by the turbulence generating element 223, so that a second electrical signal for calibrating the flow rate of the liquid lead-bismuth can be generated on the two calibration electrode pairs 222, thereby enabling the calibration component 60 to calibrate the flow rate of the liquid lead-bismuth according to the second electrical signal.

[0031] In some embodiments, the turbulence generating element 223 may be a fan-shaped structure, with a height of one third of the inner diameter of the tube 11, so as to generate a turbulent vortex signal in the liquid lead-bismuth.

[0032] In some embodiments, the turbulent vortex signal generated by the turbulence generating element in the liquid lead-bismuth can cut the magnetic field generated by the two permanent magnets 211, and generate an induced electromotive force (i.e., a second electrical signal) on the two calibration electrode pairs 222. There is a time interval between the induced electromotive forces generated on the two calibration electrode pairs 222, and this time interval is the transmission time of the turbulent vortex signal in the pipe 11; the flow rate is calibrated by sending the induced electromotive force generated on the two calibration electrode pairs 222 into the calibration component 60.

[0033] See also Figure 1 In some embodiments, the magnetic assembly 21 may include two permanent magnets 211 of the same structure, which are arranged radially outside the thermal insulation layer 12, one permanent magnet 211 is located downstream of the other permanent magnet 211, and the distance between the two permanent magnets 211 is 2 to 5 times the inner diameter of the pipe 11; wherein the flow measurement assembly 40 and the calibration signal acquisition assembly 50 are arranged outside the two permanent magnets 211. In such an embodiment, it is beneficial to fully develop the turbulent vortex signal to be stable.

[0034] join Figure 1In some embodiments, two measuring electrode pairs 221 are respectively arranged near two permanent magnets 211, and two calibration electrode pairs 222 are respectively arranged on the outside of the two permanent magnets 211 symmetrically along the axis of the pipe 11. In some embodiments, each permanent magnet 211 may include a permanent magnet segment and a magnetic conductive segment connected to each other, the permanent magnet segment is made of a cast aluminum-nickel-cobalt permanent magnet alloy material, and the magnetic conductive segment is made of an 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 an embodiment, the cast aluminum-nickel-cobalt permanent magnet material has the characteristics of high stability, high temperature resistance, and radiation resistance, and the long-term use temperature is as high as 550°C, which can realize long-term measurement of the flow rate of liquid lead-bismuth.

[0035] In some embodiments, the thermal insulation layer 12 arranged on the radially outer side of the pipe 11 can not only reduce the energy loss of liquid lead-bismuth caused by 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 generating element 223 and the permanent magnet 211 located upstream is greater than or equal to 4 times the inner diameter of the tube 11. In such an embodiment, it is also beneficial to fully develop the turbulent vortex signal to be stable.

[0037] In some embodiments, the calibration signal acquisition component 50 may include a constant current power supply, a measuring resistor, a voltage measuring device, a threshold comparison unit, and a calibration signal output device. The constant current power supply is configured to be electrically connected to the side wall of the pipe 11, and is used to apply 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, and when the contact resistance between the pipe 11 and the liquid lead bismuth changes, the voltage across the measuring resistor changes accordingly; the voltage measuring device is connected in parallel with the measuring resistor, and is used to measure the voltage across the measuring resistor after the change; the threshold comparison unit is connected in communication with the voltage measuring device, and is used to compare the voltage measured by the voltage measuring device with the reference voltage, and output a comparison signal; the calibration signal output device is connected in communication with the threshold comparison unit, and is used to determine the calibration signal according to the comparison signal output by the threshold comparison unit. In such an embodiment, the voltage measured by the voltage measuring device can be compared with the reference voltage to determine whether the contact resistance between the pipe 11 and the liquid lead bismuth has changed, and then determine whether calibration is required and determine the calibration signal.

[0038] In order to prevent the liquid lead bismuth from corroding the pipe 11, a protective oxide film is formed between the liquid lead bismuth and the pipe 11. However, with the change of operating conditions and the continuous increase of operating time, the protective oxide film between the liquid lead bismuth and the pipe 11 will peel off or be damaged, resulting in a change in the contact resistance between the liquid lead bismuth and the pipe 11. The change in the contact resistance between the liquid lead bismuth and the pipe 11 indicates that the solid-liquid interface characteristics inside the pipe 11 have changed. This change in characteristics will affect the accuracy of the measurement results of the flow rate of the liquid lead bismuth, and therefore it is necessary to calibrate the flow measured by the flow measurement component 40.

[0039] In some embodiments, the voltage measuring element and the calibration signal output element 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 measuring device 100 begins to operate stably.

[0040] In some embodiments, after long-term operation, even if the voltage measured by the voltage measuring component does not exceed the reference voltage, considering that the permanent magnet 211 is affected by radiation, thermal radiation and the passage of time, there is a possibility of demagnetization, and the flow result measured by the flow measurement component 40 still needs to be calibrated. In this case, calibration can be performed according to a fixed period.

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

[0042] In some embodiments, the distance between the spacer 212 and the two permanent magnets 211 is greater than or equal to 200 mm. In such an embodiment, it is helpful to avoid the spacer 212 made of ferromagnetic material from influencing the magnetic field of the second permanent magnet 211.

[0043] See also Figure 1 In some embodiments, the temperature measurement assembly 30 may include a heat collector 31 and a temperature measuring component 32. The heat collector 31 is disposed in the insulation layer 12 to collect heat; the temperature measuring component 32 is fixedly connected to the heat collector 31, and the temperature measuring component 32 is partially disposed in the insulation layer 12 and extends outside the insulation layer 12 to measure the temperature of the liquid lead-bismuth in the pipe 11. In such an embodiment, heat is collected by the heat collector 31, and the temperature measuring component 32 is fixedly connected to the heat collector 31, which is conducive to ensuring accurate temperature measurement of the temperature measuring component 32, and further conducive to ensuring accurate measurement of the flow rate of the liquid lead-bismuth.

[0044] In some embodiments, the heat collecting element 31 may be a stainless steel heat collecting block. In some embodiments, the temperature measuring element 32 may be an armored thermocouple, which is fixedly connected to the heat collecting element 31 by welding or crimping.

[0045] In some embodiments, the temperature measuring elements of the heat collecting element 31 and the temperature measuring element 32 are simultaneously arranged in the insulation layer 12 to ensure accurate measurement of the temperature of the liquid lead and bismuth. In some embodiments, the temperature signal measured by the temperature measuring element 32 can be sent to the flow measurement component 40, the calibration component 60 and the calibration signal acquisition component 50 for correction or call of temperature-related parameters.

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

[0047] In some embodiments, the calibration component 60 can determine the calibration coefficient based on the received calibration signal and the two second electrical signals generated on the two calibration electrode pairs 222; and can input the calibration coefficient into the flow measurement component 40 to calibrate the flow measurement component 40.

[0048] In some embodiments, the calibration component 60 includes a second electrical signal processing module, a temperature signal processing module, a signal acquisition module, a calibration coefficient determination component, a power supply, and a carrying case.

[0049] The second electrical signal processing module is electrically connected to the two calibration electrode pairs 222, and is used to receive two second electrical signals generated by the two calibration electrode pairs 222, and amplify and filter the two second electrical signals. The processed two second electrical signals are transmitted to the signal acquisition module.

[0050] The temperature signal processing module is electrically connected to the temperature measuring element 32, and is used to receive the temperature signal measured by the temperature measuring element 32, and perform cold end compensation, amplification and filtering on the temperature signal. The processed temperature signal is also transmitted to the signal acquisition module.

[0051] The signal acquisition module is electrically connected to the second electrical signal processing module and the temperature signal processing module, and is used to receive the second electrical signal processed by the second electrical signal processing module and the temperature signal processed by the temperature signal processing module, and perform digital conversion and digital filtering on the received second electrical signal and temperature signal to obtain a cross-correlation signal.

[0052] The calibration coefficient determination component is electrically connected to the signal acquisition module, and is used to receive the cross-correlation signal obtained by the signal acquisition module, and calculate, analyze, store and interact with the received cross-correlation signal to determine the calibration coefficient. The power supply is electrically connected to the second electrical signal processing module, the temperature signal processing module, the signal acquisition module and the calibration coefficient determination component, and is used to supply power to the second electrical signal processing module, the temperature signal processing module, the signal acquisition module and the calibration coefficient determination component; the second electrical signal processing module, the temperature signal processing module, the signal acquisition module, the calibration coefficient determination component and the power supply are integrated in a portable box.

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

[0054] In some embodiments, the flow measurement component 40 may include a first electrical signal detection and isolation component, a temperature signal detection processing component, a signal processing component, and a data analysis component. The first electrical signal detection and isolation component is used to receive the first electrical signal generated on the measuring electrode pair 221 and process the received first electrical signal; the temperature signal detection processing component is used to receive the temperature signal measured by the temperature measuring component 32 and process the received temperature signal; the signal processing component is used to receive the first electrical signal processed by the first electrical signal detection and isolation component and the temperature signal processed by the temperature signal detection processing component, and process the received first electrical signal and the temperature signal to obtain a measurement signal; the data analysis component is used to receive the measurement signal and the calibration coefficient to determine the flow rate of the calibrated liquid lead bismuth according to the measurement signal and the calibration coefficient.

[0055] In some embodiments, the flow measurement assembly 40 may further include a two-wire electrical component, a V / I conversion component, a power supply, and a human-machine interface component.

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

[0057] Specifically, according to the principle of Faraday's law of electromagnetic induction, the magnitude of the first electrical 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, and the unit is T; d represents the inner diameter of the pipe 11, and the unit is m; Indicates the flow rate of 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] As the temperature of liquid lead-bismuth increases, the magnetic flux density of the permanent magnet 211 will decrease, the thermal expansion of the pipeline and the shunt effect of the pipe wall will also decrease, which will cause the first electrical signal (induced electromotive force E) to decrease. Therefore, the temperature of the liquid lead-bismuth is measured by the temperature measuring component 32, and the measured temperature signal is sent to the flow measurement component 40 for compensation and correction to compensate for the instability of the first electrical signal caused by the temperature change of the liquid lead-bismuth, ensuring accurate measurement within the entire temperature range.

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

[0064] In some embodiments, the two second electrical signals generated by the two calibration electrode pairs 222 are sent to the calibration component 60, and the cross-correlation analysis method is used to calculate the corresponding time of the cross-correlation function peak of the two second electrical signals, that is, the transmission time τ of the turbulent vortex signal in the pipe 11. When the distance between the two permanent magnets 211 has been 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 rate 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 used for calibration determined by the data analysis component, and Q2 is the calibration flow rate of the liquid lead-bismuth used for calibration determined by the signal acquisition module; wherein the calibration flow rate Q2 of the liquid lead-bismuth used 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 tube 11 , v is the calibrated flow rate of the liquid lead-bismuth, and L is the distance between the two permanent magnets 211 .

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

[0071]

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

[0073] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0074] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A device for measuring the flow rate of liquid lead and bismuth, characterized in that: include: The main body comprises a pipe and a heat-insulating layer, wherein the pipe is used for liquid lead and bismuth to flow, and the heat-insulating layer is arranged on the radial outer side of the pipe to keep the liquid lead and bismuth in the pipe warm; An electric signal generating component is arranged on the radial outer side of the pipe, and during the flow of liquid lead and bismuth, the electric signal generating component can generate a first electric signal and a second electric signal; A temperature measuring component, disposed in the insulation layer and extending outside the insulation layer, for measuring the temperature of the liquid lead and bismuth in the pipe; A flow measurement component, disposed outside the electrical signal generating component, electrically connected to the temperature measurement component and the electrical signal generating component, and used to determine the flow of liquid lead bismuth according to 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 arranged outside the electrical signal generation component and can obtain a calibration signal according to a change in the contact resistance between the tube and the liquid lead-bismuth; The calibration component is electrically connected to the calibration signal acquisition component and the electrical signal generation component, and is used to receive the calibration signal and the 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 according to claim 1, characterized in that The electrical signal generating component comprises: A magnetic component is arranged radially outside the thermal insulation layer and can generate a magnetic field. When the liquid lead and bismuth flow in the pipe, they can cut the magnetic lines of force of the magnetic field generated by the magnetic component; An electric signal generating component is disposed in the thermal insulation layer, and when the liquid lead and bismuth cut the magnetic lines of force of the magnetic field generated by the magnetic component, the electric signal generating component generates a first electric signal and a second electric signal; Wherein, the flow measurement component and the calibration signal acquisition component are arranged on the outside of the magnetic component, and the calibration component is electrically connected to the electrical signal generating component.

3. The measuring device according to claim 2, characterized in that The electrical signal generating element comprises: Two measuring electrode pairs, respectively arranged at the radial inner side of the magnetic component, and the two measuring electrode pairs can generate a first electrical signal; Two calibration electrode pairs, respectively arranged at the radial inner side of the magnetic assembly, and the two calibration electrode pairs can generate a second electrical signal; The two electrodes in each measuring electrode pair are symmetrically arranged along the axial direction of the pipe, and the two electrodes in each calibration electrode pair are also symmetrically arranged along the axial direction of the pipe. The two electrodes in each measuring electrode pair and the two electrodes in each calibration electrode pair are staggered in the circumferential direction of the pipe.

4. The measuring device according to claim 3, characterized in that The magnetic assembly comprises: Two permanent magnets of the same structure are arranged radially outside the thermal insulation layer, one of the permanent magnets is located downstream of the other permanent magnet, and the distance between the two permanent magnets is 2 to 5 times the inner diameter of the pipe; Wherein, the flow measurement component and the calibration signal acquisition component are arranged on the outside of the two permanent magnets.

5. The measuring device according to claim 4, characterized in that The electrical signal generating element further comprises: The turbulence generating component is arranged on the inner wall of the tube near the inlet of the liquid lead-bismuth, and is used to generate a turbulent vortex signal in the liquid lead-bismuth. When the turbulent vortex signal flows, it can cut the magnetic lines of force of the magnetic field generated by the two permanent magnets, thereby generating a second electrical signal on the two calibration electrode pairs.

6. The measuring device according to claim 5, characterized in that The distance between the turbulence generating element and the permanent magnet located upstream is greater than or equal to 4 times the inner diameter of the pipe.

7. The measuring device according to claim 1, characterized in that The calibration signal obtaining component comprises: A constant current power supply, arranged to be electrically connected to the side wall of the pipe fitting, and used to apply a constant voltage to the side wall of the pipe fitting; A measuring resistor is connected in series with the constant current power supply and the side wall of the tube, and when the contact resistance between the tube and the liquid lead bismuth changes, the voltage across the measuring resistor changes accordingly; A voltage measuring element, connected in parallel with the measuring resistor, for measuring the voltage after the voltage at both ends of the measuring resistor changes; a threshold comparison unit, connected in communication with the voltage measurement component, for comparing the voltage measured by the voltage measurement component with a reference voltage and outputting a comparison signal; The calibration signal output element is communicatively connected to the threshold comparison unit and is used to determine the calibration signal according to the comparison signal output by the threshold comparison unit.

8. The measuring device according to claim 5, characterized in that The magnetic assembly further comprises: an isolating member, disposed between the calibration signal acquisition component and the two permanent magnets, for isolating the calibration signal acquisition component from the two permanent magnets, The isolating element is made of ferromagnetic material.

9. The measuring device according to claim 8, characterized in that The distance between the isolation piece and the two permanent magnets is greater than or equal to 200 mm.

10. The measuring device according to claim 1, characterized in that The temperature measurement component comprises: A heat collecting member, arranged in the thermal insulation layer, for collecting heat; A temperature measuring component is fixedly connected to the heat collecting component. The temperature measuring component is partially arranged in the insulation layer and extends outside the insulation layer, and is used to measure the temperature of the liquid lead and bismuth in the pipe.

Images