CN114877958B - Liquid metal electromagnetic flowmeter based on magnetic freezing effect and measuring method thereof - Google Patents
Liquid metal electromagnetic flowmeter based on magnetic freezing effect and measuring method thereof Download PDFInfo
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- CN114877958B CN114877958B CN202210507798.3A CN202210507798A CN114877958B CN 114877958 B CN114877958 B CN 114877958B CN 202210507798 A CN202210507798 A CN 202210507798A CN 114877958 B CN114877958 B CN 114877958B
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- receiving coil
- liquid metal
- coil
- electromagnetic flowmeter
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- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 87
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 48
- 230000000694 effects Effects 0.000 title claims abstract description 32
- 238000007710 freezing Methods 0.000 title claims abstract description 27
- 230000008014 freezing Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 15
- 230000005284 excitation Effects 0.000 claims abstract description 14
- 230000006698 induction Effects 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims description 2
- 229910001152 Bi alloy Inorganic materials 0.000 abstract description 8
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 9
- 230000004907 flux Effects 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 229910052797 bismuth Inorganic materials 0.000 description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910000799 K alloy Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 206010033307 Overweight Diseases 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/586—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of coils, magnetic circuits, accessories therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/14—Casings, e.g. of special material
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to a liquid metal metering device, in particular to a liquid metal electromagnetic flowmeter based on a magnetic freezing effect and a measuring method thereof, which solve the technical problems that when the conventional permanent magnet electromagnetic flowmeter adopts a contact electrode to measure the flow of lead-bismuth alloy fluid, the contact electrode is corroded to influence the measuring precision of the permanent magnet flowmeter, and the permanent magnet flowmeter is difficult to meet the measuring requirement of high-temperature liquid metal. The liquid metal electromagnetic flowmeter based on the magnetic freezing effect comprises a signal processing module, an excitation power supply, a shielding shell, an excitation coil and a signal receiving coil, wherein the excitation coil and the signal receiving coil are arranged in the shielding shell; the first signal receiving coil and the second signal receiving coil are parallel to each other; the exciting coil, the first signal receiving coil and the second signal receiving coil are all positioned on the same side of the liquid metal runner to be tested; the output ends of the first signal receiving coil and the second signal receiving coil are respectively connected with two input ends of the signal processing module.
Description
Technical Field
The invention relates to a liquid metal metering device, in particular to a liquid metal electromagnetic flowmeter based on a magnetic freezing effect and a measuring method thereof.
Background
With the development of reactors using liquid metal as a coolant, the problems of the thermodynamic and hydraulic characteristics, corrosiveness and the like of the liquid metal are increasingly studied. In particular, the lead bismuth fast reactor has a plurality of advantages, and the lead bismuth alloy has the advantages of stable chemical property and high boiling point, so that the lead bismuth fast reactor has inherent safety.
At present, the domestic and foreign scientific research institutes develop extensive experimental researches on the thermal hydraulic power and corrosiveness of the lead-bismuth alloy, and the experiments also develop towards the large-scale and extreme working conditions, which puts a severe requirement on the flow measurement of the lead-bismuth alloy. Because the lead-bismuth alloy has strong corrosiveness, the traditional permanent magnet type electromagnetic flowmeter adopts a contact electrode to measure the induced electromotive force, so that the corrosion of the lead-bismuth alloy to the pipeline and the electrode can gradually attenuate a measurement signal, and the measurement precision of the permanent magnet type electromagnetic flowmeter is greatly reduced; when the temperature of the permanent magnet in the traditional permanent magnet type liquid metal electromagnetic flowmeter changes, the magnetic induction intensity generated by the permanent magnet type liquid metal electromagnetic flowmeter also changes, so that the measured flow signal changes, and the accuracy of the flowmeter is deteriorated. Moreover, for a large-scale test device, a large-size and high-weight permanent magnet is required to be processed, so that the convenience and the economy of the use of the permanent magnet type electromagnetic flowmeter are greatly limited. In the existing ultrasonic flowmeter, the guided wave material is required to be closely attached to the pipe wall of the liquid metal runner to be detected, and the temperature limit value of the guided wave material greatly restricts the use of the ultrasonic flowmeter in an ultra-high temperature experiment.
Disclosure of Invention
The invention aims to provide a liquid metal electromagnetic flowmeter and a measuring method thereof based on a magnetic freezing effect, aiming at the technical problems that when the conventional permanent magnet electromagnetic flowmeter adopts a contact electrode to measure the flow of lead bismuth alloy fluid, the contact electrode is corroded to influence the measuring precision of the permanent magnet flowmeter and the permanent magnet flowmeter is difficult to meet the measuring requirement of high-temperature liquid metal, so that the liquid metal electromagnetic flowmeter has the characteristics of wide measuring range, high precision and high temperature resistance.
In order to solve the technical problems, the invention adopts the following technical scheme:
The utility model provides a liquid metal electromagnetic flowmeter based on magnetism freezes effect which characterized in that: the device comprises a signal processing module, an excitation power supply, a shielding shell, an excitation coil and a signal receiving coil, wherein the excitation coil and the signal receiving coil are arranged in the shielding shell;
The shielding shell is used for being sleeved on the liquid metal runner to be tested;
The axis of the signal receiving coil is parallel to the liquid metal runner to be detected and is positioned in the exciting coil;
The signal receiving coil comprises a first signal receiving coil and a second signal receiving coil;
The first signal receiving coil and the second signal receiving coil are parallel to each other, and the axes of the first signal receiving coil and the second signal receiving coil are perpendicular to the axis of the exciting coil;
The exciting coil, the first signal receiving coil and the second signal receiving coil are all positioned on the same side of the liquid metal runner to be tested;
the output ends of the first signal receiving coil and the second signal receiving coil are respectively connected with two input ends of the signal processing module;
the exciting coil supplies an alternating current through an exciting power supply.
Further, the first signal receiving coil and the second signal receiving coil are the same in size.
Further, the output frequency of the excitation power supply is 50Hz-300Hz, and the current is 0.5A-3A.
Further, the exciting coil, the first signal receiving coil and the second signal receiving coil are all made of copper wires.
Further, the shielding shell is made of ferromagnetic materials.
The measuring method of the liquid metal electromagnetic flowmeter based on the magnetic freezing effect is based on the liquid metal electromagnetic flowmeter based on the magnetic freezing effect and is characterized by comprising the following steps of:
Step 1: providing alternating current for an exciting coil through an exciting power supply, wherein the alternating current generates an alternating magnetic field in a liquid metal runner to be detected; under the effect of magnetic freezing effect, the magnetic induction wire moves together with the liquid metal, so that the first signal receiving coil and the second signal receiving coil respectively generate induced electromotive force;
Step 2: the method comprises the steps of receiving the values of the induced electromotive forces of a first signal receiving coil and a second signal receiving coil through a signal processing module;
step 3: and (3) obtaining the flow velocity and the volume flow of the liquid metal to be detected according to the induced electromotive force value obtained in the step (2).
In step 3, the flow velocity and the volume flow of the liquid metal to be measured are obtained by interpolation calculation.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
(1) The liquid metal magnetic field based on the magnetic freezing effect is generated by the first signal receiving coil and the second signal receiving coil, the generated magnetic induction intensity is only related to exciting current provided by an exciting power supply, the magnetic induction intensity is irrelevant to the temperature of the liquid metal, and the influence of the temperature change of the liquid metal on the magnetic freezing effect is small; therefore, the flowmeter provided by the invention has the advantages of small temperature drift and high precision.
(2) In the liquid metal electromagnetic flowmeter based on the magnetic freezing effect, the measuring signal is the difference between alternating current and induced voltage in the signal receiving coil, and is non-contact measurement; in the traditional permanent magnet type liquid metal electromagnetic flowmeter, the Hall voltages at the two radial ends of the flow channel are measured through the electrodes in the flow channel, so that the flow rate is obtained, when the measured working medium is corrosive liquid metal (such as lead bismuth alloy), the measuring electrodes are corroded, so that the measuring signals are greatly attenuated, and the measuring error is large. Therefore, the invention has no influence on the measuring signal when the measuring working medium is corrosive, and ensures the accuracy and high precision of the measuring result.
(3) For different liquid metals, alternating currents with different frequencies and different magnitudes can be provided for the exciting coil through adjusting the exciting power supply, so that the magnitude of induced electromotive force in the signal receiving coil is improved, the measurement accuracy of the electromagnetic flowmeter is further improved, and the exciting power supply can be adjusted according to the magnitude of the measured magnetic Reynolds number of the liquid metal.
(4) The liquid metal electromagnetic flowmeter based on the magnetic freezing effect is also suitable for flow measurement of liquid metals such as sodium, potassium, lithium, sodium-potassium alloy and the like.
Drawings
FIG. 1 is a schematic diagram of a liquid metal electromagnetic flowmeter based on magnetic freezing effect for measuring the flow rate of liquid metal to be measured;
FIG. 2 is a schematic diagram of the structure of the shielding shell, the exciting coil, the signal receiving coil and the liquid metal runner to be tested in the embodiment of the invention;
Fig. 3 is a top view of fig. 2.
The reference numerals in the drawings are:
The device comprises a liquid metal runner to be tested, a 2-exciting coil, a 3-first signal receiving coil, a 4-second signal receiving coil, a 5-exciting power supply, a 6-signal processing module and a 7-shielding shell.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and complete in conjunction with the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the present invention. Based on the technical solutions of the present invention, all other embodiments obtained by a person skilled in the art without making any creative effort fall within the protection scope of the present invention.
As shown in fig. 1, 2 and 3, the liquid metal electromagnetic flowmeter based on the magnetic freezing effect comprises a signal processing module 6, an exciting power supply 5, a shielding shell 7, an exciting coil 2 and a signal receiving coil, wherein the exciting coil 2 and the signal receiving coil are arranged in the shielding shell 7; the shielding housing 7 is used for shielding interference of external electromagnetic signals to the first signal receiving coil 3 and the second signal receiving coil 4.
The shielding shell 7 is used for being sleeved on the liquid metal runner 1 to be tested;
The axis of the signal receiving coil is parallel to the liquid metal runner 1 to be tested and is positioned in the exciting coil 2;
The signal receiving coil comprises a first signal receiving coil 3 and a second signal receiving coil 4;
The first signal receiving coil 3 and the second signal receiving coil 4 are parallel to each other, and the axes of the first signal receiving coil 3 and the second signal receiving coil 4 are perpendicular to the axis of the exciting coil 2;
the exciting coil 2, the first signal receiving coil 3 and the second signal receiving coil 4 are all positioned on the same side of the liquid metal runner 1 to be tested;
the output ends of the first signal receiving coil 3 and the second signal receiving coil 4 are respectively connected with two input ends of the signal processing module 6.
When the exciting power supply 5 supplies power to the exciting coil 2, an alternating magnetic field penetrating through the liquid metal in the liquid metal runner 1 to be detected is formed.
When the liquid metal does not flow, the magnetic flux and the change rate of the magnetic flux in the first signal receiving coil 3 and the second signal receiving coil 4 are the same, so that the induced electromotive forces induced by the first signal receiving coil 3 and the second signal receiving coil 4 are equal, and at the moment, the flow speed and the flow value of the liquid metal output by the signal processing module 6 are zero;
When the liquid metal flows, due to the magnetic freezing effect, the magnetic induction lines generated by the exciting coil 2 and penetrating through the liquid metal in the liquid metal runner 1 to be detected move along with the liquid metal, so that the magnetic flux and the magnetic flux change rate penetrating through the first signal receiving coil 3 and the second signal receiving coil 4 are not equal any more, different induced electromotive forces are induced in the first signal receiving coil 3 and the second signal receiving coil 4, and the larger the liquid metal flow velocity is, the larger the difference value of the induced electromotive forces is induced in the first signal receiving coil 3 and the second signal receiving coil 4 is; finally, the first signal receiving coil 3 and the second signal receiving coil 4 respectively output different induced electromotive forces, and after receiving the induced electromotive forces output by the first signal receiving coil 3 and the second signal receiving coil 4, the signal processing module 6 can obtain the flow velocity and the flow value of the liquid metal through interpolation calculation.
When different liquid metals are measured, the magnetic freezing effect is different, and the output signal is different in size because the magnetic renot number of the different liquid metals is different under the same flow channel (with the same size), flow rate and temperature. In order to improve the measurement accuracy of the liquid metal electromagnetic flowmeter, for liquid metal with smaller conductivity, the excitation power supply 5 can be adjusted to provide alternating currents with different frequencies and sizes for the excitation coil 2, so that the magnitude of induced electromotive force in the signal receiving coil is improved, and the measurement accuracy of the liquid metal electromagnetic flowmeter is further improved;
in the embodiment, the liquid metal runner 1 to be measured is a circular tube, and has no part with large shape resistance coefficient such as taper, gradual expansion and the like in the interior, so that no extra flow resistance is generated; the outer part of the magnetic field excitation coil is coated with a high-thermal-resistance heat-insulating material, so that radial transfer of heat can be reduced, and damage to the excitation coil 2, the first signal receiving coil 3 and the second signal receiving coil 4 caused by high-temperature liquid metal is avoided; the exciting coil 2, the first signal receiving coil 3 and the second signal receiving coil 4 are formed by winding copper wires coated with high-temperature insulating layers, the exciting coil 2, the first signal receiving coil 3 and the second signal receiving coil 4 are positioned on the same side of the liquid metal runner 1 to be tested, the first signal receiving coil 3 and the second signal receiving coil 4 are positioned in the exciting coil 2, and the first signal receiving coil 3 and the second signal receiving coil 4 are identical in structure and size and symmetrical; the output signals of the first signal receiving coil 3 and the second signal receiving coil 4 are connected into the signal processing module 6; the shielding shell 7 is arranged outside the liquid metal electromagnetic flowmeter, the shielding shell 7 is used for shielding interference of external electromagnetic signals on the signal receiving coil, and the shielding shell 7 is processed by adopting ferromagnetic materials.
The output frequency of the exciting power supply 5 is 50-300Hz, and the current is 0.5A-3A; the exciting power supply 5 provides alternating current for the exciting coil 2, and the magnetic thunder number of the exciting power supply can be adjusted according to the measured liquid metal magnetic thunder number according to different types of the measured liquid metal; for different liquid metals, alternating currents with different frequencies and different magnitudes can be provided for the exciting coil 2 by adjusting the exciting power supply 5, so that the magnitude of induced electromotive force in the first signal receiving coil 3 and the second signal receiving coil 4 is improved, and the measurement accuracy of the liquid metal electromagnetic flowmeter is further improved.
In addition, the invention also provides a measuring method of the liquid metal electromagnetic flowmeter based on the magnetic freezing effect, which is based on the liquid metal electromagnetic flowmeter based on the magnetic freezing effect and comprises the following steps:
step 1: supplying alternating current to the exciting coil 2 through the exciting power supply 5, wherein the alternating current generates an alternating magnetic field in the liquid metal runner 1 to be tested; under the effect of magnetic freezing effect, the magnetic induction wire moves together with the liquid metal, so that the first signal receiving coil 3 and the second signal receiving coil 4 respectively generate induced electromotive force;
step 2: receiving the values of the induced electromotive forces of the first signal receiving coil 3 and the second signal receiving coil 4 through the signal processing module 6;
step 3: and (3) obtaining the flow velocity and the volume flow of the liquid metal through interpolation calculation according to the induced electromotive force value obtained in the step (1).
Claims (7)
1. The utility model provides a liquid metal electromagnetic flowmeter based on magnetism freezes effect which characterized in that: the device comprises a signal processing module (6), an excitation power supply (5), a shielding shell (7), an excitation coil (2) and a signal receiving coil, wherein the excitation coil (2) and the signal receiving coil are arranged in the shielding shell (7);
the shielding shell (7) is used for being sleeved on the liquid metal runner (1) to be tested;
the axis of the signal receiving coil is parallel to the liquid metal runner (1) to be detected and is positioned in the exciting coil (2);
The signal receiving coil comprises a first signal receiving coil (3) and a second signal receiving coil (4);
The first signal receiving coil (3) and the second signal receiving coil (4) are parallel to each other, and the axes of the first signal receiving coil (3) and the second signal receiving coil (4) are perpendicular to the axis of the exciting coil (2);
The exciting coil (2), the first signal receiving coil (3) and the second signal receiving coil (4) are all positioned on the same side of the liquid metal runner (1) to be tested;
the output ends of the first signal receiving coil (3) and the second signal receiving coil (4) are respectively connected with two input ends of the signal processing module (6);
the exciting coil (2) supplies alternating current through an exciting power supply (5).
2.A liquid metal electromagnetic flowmeter based on the magnetic freezing effect of claim 1, wherein: the first signal receiving coil (3) and the second signal receiving coil (4) are the same in size.
3. A liquid metal electromagnetic flowmeter based on the magnetic freezing effect according to claim 1 or 2, characterized in that: the output frequency of the exciting power supply (5) is 50Hz-300Hz, and the current is 0.5A-3A.
4. A liquid metal electromagnetic flowmeter based on the magnetic freezing effect of claim 3, wherein: the exciting coil (2), the first signal receiving coil (3) and the second signal receiving coil (4) are all made of copper wires.
5. The liquid metal electromagnetic flowmeter based on the magnetic freezing effect of claim 4, wherein: the shielding shell (7) is made of ferromagnetic materials.
6. A method for measuring a liquid metal electromagnetic flowmeter based on a magnetic freezing effect, based on any one of claims 1-5, characterized by comprising the steps of:
Step 1: supplying alternating current to the exciting coil (2) through an exciting power supply (5), wherein the alternating current generates an alternating magnetic field in the liquid metal runner (1) to be tested; under the effect of magnetic freezing effect, the magnetic induction wire moves together with the liquid metal, so that the first signal receiving coil (3) and the second signal receiving coil (4) respectively generate induced electromotive force;
Step 2: receiving the values of the induced electromotive forces of the first signal receiving coil (3) and the second signal receiving coil (4) by using a signal processing module (6);
step 3: and (3) obtaining the flow velocity and the volume flow of the liquid metal to be detected according to the induced electromotive force value obtained in the step (2).
7. The method for measuring the electromagnetic flowmeter for liquid metal based on the magnetic freezing effect according to claim 6, wherein the method comprises the following steps: in step 3, the flow velocity and the volume flow of the liquid metal to be measured are obtained by interpolation calculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210507798.3A CN114877958B (en) | 2022-05-10 | 2022-05-10 | Liquid metal electromagnetic flowmeter based on magnetic freezing effect and measuring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210507798.3A CN114877958B (en) | 2022-05-10 | 2022-05-10 | Liquid metal electromagnetic flowmeter based on magnetic freezing effect and measuring method thereof |
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| CN114877958A CN114877958A (en) | 2022-08-09 |
| CN114877958B true CN114877958B (en) | 2024-06-11 |
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2022
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| CN114877958A (en) | 2022-08-09 |
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