CN105675651A - Apparatus and method for detecting gas content in liquid metal - Google Patents
Apparatus and method for detecting gas content in liquid metal Download PDFInfo
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- CN105675651A CN105675651A CN201610048541.0A CN201610048541A CN105675651A CN 105675651 A CN105675651 A CN 105675651A CN 201610048541 A CN201610048541 A CN 201610048541A CN 105675651 A CN105675651 A CN 105675651A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- 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
- G01F1/64—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 measuring electrical currents passing through the fluid flow; measuring electrical potential generated by the fluid flow, e.g. by electrochemical, contact or friction effects
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
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Abstract
The invention belongs to the technical field of gas content measurement and discloses an apparatus and method for detecting gas content in a liquid metal.The apparatus comprises a primary sensor and a secondary instrument, wherein the primary sensor comprises a magnetic steel assembly, a pipeline assembly, a turbulence generator, electrodes and a supporting and positioning assembly; the method includes: detecting the gas content in the liquid metal according to differences between sensing signals generated by the liquid metal and a gas therein cutting magnetic lines of force.The apparatus and method have the advantages of high response speed, high sensitivity and high accuracy.
Description
Technical field
The invention belongs to gas content measurement techniques field, it is specifically related to a kind of device and method detecting gas content in liquid metal.
Background technology
In some production run process, in liquid metal, volume concentration of gas phase requires lower than a certain limit value, and gas volume increase may mean the generation of accident, therefore, by volume concentration of gas phase in monitoring liquid metal, it is possible to reach the object of monitoring accident.
For sodium-cooled fast reactor, fast reactor is main force's heap-type of the advanced nuclear energy system of world's forth generation, liquid metal sodium is owing to having a good thermal conduction characteristic and neutrons characteristic is selected as the refrigerant material of fast neutron reactor, and sodium Metal 99.5 has the advantages that chemical property is active, vigorous reaction releasing hydrogen gas occurs Yi Yushui. Vapour generator is that sodium-cooled fast reactor obtains one of important equipment, and it is the interchanger of a tube shell type structure, and pipe side is high pressure water, shell side is high-temperature sodium, object is that the heat by shell side sodium passes to the water of pipe side so that water formation superheated vapour, for the generating of follow-up steam turbine. Due to the severe environment of its intrinsic problem in material, manufacture and processing and its work, with regard to making, the heat transfer tube of vapour generator has the possibility broken for this, and it is the major hidden danger of sodium-cooled fast reactor safe operation that vapour generator pipeline leaks. Vapour generator once occur pipeline leakage, violent chemical reaction can be there is in the water of pipe side with the sodium of shell side, produce a large amount of hydrogen, in reactor operation process, in Liquid Sodium, the increase of gas volume may mean the generation of accident, therefore, to there is the volume concentration of gas phase change in reflecting liquid sodium in time of corresponding means of detection and method, have an accident to avoid.
What in current existing a kind of liquid metal, gas detection and warning device adopted is scattering and permeating principle, the increase of gas content can cause the change of pressure in vacuum system, thus reach the object of gas in monitoring liquid metal, but the time of response of gas warning system is longer in this liquid metal, can not the change of the gas content in reflecting liquid metal in time.
Summary of the invention
(1) goal of the invention
According to existing existing problem, the present invention provides the device and method of gas content in the high detection liquid metal of a kind of safe and reliable, fast response time, accuracy.
(2) technical scheme
In order to solve the problem existing for prior art, technical scheme provided by the invention is as follows:
Detecting a device for gas content in liquid metal, this device comprises a sensor and secondary instrument, and wherein a sensor comprises magnetic steel component, conduit assembly, turbulator, electrode and supporting positioning component;
The two ends of described conduit assembly are provided with interface, this interface respectively with the pipeline communication of liquid metal to be detected;
Described turbulator is positioned at conduit assembly, and turbulator makes the liquid metal fluid in conduit assembly produce eddy current, increases signal fluctuation amplitude;
Described magnetic steel component mainly comprises two permanent magnets and magnetizer, and wherein permanent magnet is ox corner-shape structure, and the two ends of magnetizer are fixedly connected with two ox horn type permanent magnets respectively, and magnetizer and two permanent magnet assemblings are rear C-shaped; Conduit assembly is central position between two N poles, ox horn type permanent magnet upper end and S pole, and all leaves the clearance of 1～5mm between conduit assembly and two permanent magnets; The magnetic line of force direction that permanent magnet is formed is vertical with liquid metal flows direction; These two permanent magnets are fixedly connected with conduit assembly by pipe clamp;
The quantity of described electrode be 1 to or multipair, the often pair of electrode is positioned at the identical position at the two ends up and down of conduit assembly, and is all perpendicular to the magnetic line of force direction of permanent magnet.
Described secondary instrument is connected with electrode by signal cable, it comprises signal amplification module, filtering module and signal processing module, the inductive emf that liquid towards metal cutting magnetic line of force produces carries out filtering and signal processing, the background signal that the noise signal that gas produces produces from liquid metal fluid is extracted, obtains background signal and the signal to noise ratio of noise signal; In addition, the signal that a sensor exports can also be carried out analog to digital conversion, spectral decomposition, display translation flow and the output of accident alarming signal by secondary instrument.
Preferably, described turbulator is wedge shape polyhedral structure.
Preferably, described turbulator is positioned at the radial center position of conduit assembly, and the placement direction of turbulator is the wide face making liquid metal first flow through wedge shape polyhedral structure, and then flows through the leptoprosopy of wedge shape polyhedral structure.
Preferably, the quantity of described electrode is 1 right.
Preferably, described liquid metal is sodium.
Preferably, the clearance of 1～2mm is all left between conduit assembly and two ox horn type permanent magnets.
Preferably, described secondary instrument also comprises flow rate calculation module, it is possible to calculates and shows the liquid metal flux in a sensor place liquid metal pipeline.
Gas content in said apparatus liquid towards metal is utilized to carry out the method detected, the method be utilize liquid metal and wherein contained gas cutting magnetic line to be produced to respond to signal different, realizing gas content in liquid towards metal to detect, it comprises following technical scheme:
The conduit assembly of above-mentioned means of detection is connected with liquid metal pipeline to be detected, liquid metal and contained gas thereof form eddy current after turbulator, cutting magnetic line when flowing in the conduit assembly being perpendicular to magnetic field, produces inductive emf on the electrode perpendicular with liquid metal movement direction and magnetic line of force direction;
Time in liquid metal containing gas, forming two parts of signals after turbulator, the noise signal that wherein a part produces for gas, a part is liquid metal naturally turbulent, the background signal that fluctuates in the duct and formed in the duct; This two parts of signals is transmitted to secondary instrument by a sensor, its signal is amplified by the signal amplification module of secondary instrument, and noise signal can be extracted from background signal, obtain the power spectrum density ratio of background signal and noise signal, by comparing with the threshold value of setting, judge whether to provide the guard signal of vapour generator leakage.
Preferably, described liquid metal is sodium.
(3) useful effect
The device of gas content and method in detection liquid metal provided by the invention, have fast response time, sensitivity, accuracy height and the useful effect that detects can also be carried out by liquid towards metal flow while probe gas content, it is different that specific explanations utilizes liquid metal and contained gas cutting magnetic line to be produced induction signal by: the method, realize gas content in liquid towards metal to detect, having no similar gas detection report in the prior art, sensitivity and accuracy are higher. This device is by arranging turbulator in conduit assembly, liquid metal and gas is made to form eddy current through turbulator, the electromotive force signal place range of frequency that liquid metal and gas are produced when cutting magnetic line is more easily distinguished, it is beneficial to secondary instrument to be analyzed by its signal, thus it is faster to realize the response speed to gas-monitoring, sensitivity is higher. The more important thing is, the turbulator of wedge shape polyhedral structure reduces other disturbances and the noise of fluid so that eddy current signal is not only strong but also stablize, and improves the separate stage of whirlpool, and the whirlpool simultaneously produced has the good linear lag and rangeability. Magnet structure takes ox corner-shape structure, stable magnetic field height simultaneously. For sodium-cooled fast reactor, this means of detection and method can complete water leakage rate within the scope of 0.1g/s-10g/s gas volume share monitoring and signal alarm, guard signal formation time is less than 1s, meets gas-monitoring needs in fast reactor sodium cooling agent. Finally, the secondary instrument that this means of detection and method adopt also comprises flow rate calculation module, according to the electromotive force signal size that electrode causes, calculates fluid flow rate, it is achieved in same set of device, realize bubble detection and flow measurement simultaneously.
Accompanying drawing explanation
Fig. 1 is the means of detection schematic diagram that the application provides; Wherein 1 is permanent magnet; 2 is electrode; 3 is conduit assembly; 4 is turbulator; 5 is supporting and location assembly; 6 is pipe clamp; 7 is magnetizer; 8 is shield cap; Fig. 2 is means of detection partial schematic diagram.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the present invention is further elaborated.
Embodiment 1
Detecting a device for gas content in liquid metal, this device comprises a sensor and secondary instrument, and wherein a sensor comprises magnetic steel component, conduit assembly 3, turbulator 4, electrode 2 and supporting positioning component 5;
The two ends of described conduit assembly 3 are connected by interface with liquid metal pipeline to be detected respectively;
Described turbulator 4 is positioned at conduit assembly, and turbulator 4 makes the fluid in conduit assembly 3 produce eddy current, increases signal fluctuation amplitude; Described turbulator 4 is wedge shape polyhedral structure, and it is positioned at the radial center position of conduit assembly 3, and the placement direction of turbulator 4 is the wide face making liquid metal first flow through wedge shape polyhedral structure, and then flows through the leptoprosopy of wedge shape polyhedral structure.
Described magnetic steel component mainly comprises two permanent magnets 1 and magnetizer 7, and wherein permanent magnet 1 is ox corner-shape structure, and the two ends of magnetizer 7 are fixedly connected with two ox horn type permanent magnets 1 respectively, and magnetizer 7 and two permanent magnets 1 are C-shaped after assembling; Conduit assembly 3 is central position between the N pole, upper end and S pole of two ox horn type permanent magnets 1, and all leaves the clearance of 2mm between conduit assembly 3 and two ox horn type permanent magnets;The magnetic line of force direction that permanent magnet 1 is formed is vertical with liquid metal flows direction; These two permanent magnets 1 are fixedly connected with conduit assembly 3 by pipe clamp 6;
The quantity of described electrode 2 is 1 right, and two electrodes 2 are positioned at the identical position at the two ends up and down of conduit assembly 3, and are all perpendicular to the magnetic line of force direction of permanent magnet.
Described secondary instrument is connected with electrode by signal cable, it comprises signal amplification module, filtering module and signal processing module, the inductive emf that liquid towards metal cutting magnetic line of force produces carries out filtering and signal processing, the background signal that the noise signal that gas produces produces from liquid metal fluid is extracted, obtains background signal and the signal to noise ratio of noise signal; In addition, the signal that a sensor exports can also be carried out analog to digital conversion, spectral decomposition, calculating liquid metal flux, display translation flow and the output of accident alarming signal by secondary instrument.
Gas content in said apparatus liquid towards metal is utilized to carry out the method detected, the method be utilize liquid metal and wherein contained gas cutting magnetic line to be produced to respond to signal different, realizing gas content in liquid towards metal to detect, it comprises following technical scheme:
The conduit assembly of above-mentioned means of detection is connected with liquid metal pipeline to be detected, liquid metal and contained gas thereof form eddy current after turbulator, cutting magnetic line when flowing in the conduit assembly being perpendicular to magnetic field, produces inductive emf on the electrode perpendicular with liquid metal movement direction and magnetic line of force direction;
Time in liquid metal containing gas, forming two parts of signals after turbulator, the noise signal that wherein a part produces for gas, a part is liquid metal naturally turbulent, the background signal that fluctuates in the duct and formed in the duct; This two parts of signals is transmitted to secondary instrument by a sensor, its signal is amplified by the signal amplification module of secondary instrument, and noise signal can be extracted from background signal, obtain the power spectrum density ratio of background signal and noise signal, by comparing with the threshold value of setting, judge whether to provide the guard signal of vapour generator leakage.
Embodiment 2
As different from Example 1, liquid metal is sodium, and the quantity of electrode is 2 right. The clearance of 1mm is all left between conduit assembly and two ox horn type permanent magnets.
Claims (9)
1. one kind detects the device of gas content in liquid metal, it is characterised in that, this device comprises a sensor and secondary instrument, and wherein a sensor comprises magnetic steel component, conduit assembly, turbulator, electrode and supporting positioning component;
The two ends of described conduit assembly are provided with interface, this interface respectively with the pipeline communication of liquid metal to be detected;
Described turbulator is positioned at conduit assembly, and turbulator makes the liquid metal fluid in conduit assembly produce eddy current, increases signal fluctuation amplitude;
Described magnetic steel component mainly comprises two permanent magnets and magnetizer, and wherein permanent magnet is ox corner-shape structure, and the two ends of magnetizer are fixedly connected with two ox horn type permanent magnets respectively, and magnetizer and two permanent magnet assemblings are rear C-shaped; The central position of conduit assembly between two N poles, ox horn type permanent magnet upper end and S pole, and between conduit assembly and two permanent magnets, all leave the clearance of 1～5mm; The magnetic line of force direction that permanent magnet is formed is vertical with liquid metal flows direction; These two permanent magnets are fixedly connected with conduit assembly by pipe clamp;
The quantity of described electrode be 1 to or multipair, the often pair of electrode is positioned at the identical position at the two ends up and down of conduit assembly, and is all perpendicular to the magnetic line of force direction of permanent magnet;
Described secondary instrument is connected with electrode by signal cable, it comprises signal amplification module, filtering module and signal processing module, the inductive emf that liquid towards metal cutting magnetic line of force produces carries out filtering and signal processing, the background signal that the noise signal that gas produces produces from liquid metal fluid is extracted, obtains background signal and the signal to noise ratio of noise signal; In addition, the signal that a sensor exports can also be carried out analog to digital conversion, spectral decomposition, display translation flow and the output of accident alarming signal by secondary instrument.
2. a kind of device detecting gas content in liquid metal according to claim 1, it is characterised in that, described turbulator is wedge shape polyhedral structure.
3. a kind of device detecting gas content in liquid metal according to claim 1, it is characterized in that, described turbulator is positioned at the radial center position of conduit assembly, and the placement direction of turbulator is the wide face making liquid metal first flow through wedge shape polyhedral structure, and then flow through the leptoprosopy of wedge shape polyhedral structure.
4. a kind of device detecting gas content in liquid metal according to claim 1, it is characterised in that, the quantity of described electrode is 1 right.
5. a kind of device detecting gas content in liquid metal according to claim 1, it is characterised in that, described liquid metal is sodium.
6. a kind of device detecting gas content in liquid metal according to claim 1, it is characterised in that, all leave the clearance of 1～2mm between conduit assembly and two ox horn type permanent magnets.
7. a kind of device detecting gas content in liquid metal according to claim 1, it is characterised in that, described secondary instrument also comprises flow rate calculation module, it is possible to calculate the flow of liquid metal to be detected.
8. utilize gas content in the device liquid towards metal described in claim 1 to carry out the method detected, it is characterized in that, the method be utilize liquid metal and wherein contained gas cutting magnetic line to be produced to respond to signal different, realizing gas content in liquid towards metal to detect, it comprises following technical scheme:
The conduit assembly of above-mentioned means of detection is connected with liquid metal pipeline to be detected, liquid metal and contained gas thereof form eddy current after turbulator, cutting magnetic line when flowing in the conduit assembly being perpendicular to magnetic field, produces inductive emf on the electrode perpendicular with liquid metal movement direction and magnetic line of force direction;
Time in liquid metal containing gas, forming two parts of signals after turbulator, the noise signal that wherein a part produces for gas, a part is liquid metal naturally turbulent, the background signal that fluctuates in the duct and formed in the duct; This two parts of signals is transmitted to secondary instrument by a sensor, its signal is amplified by the signal amplification module of secondary instrument, and noise signal can be extracted from background signal, obtain the power spectrum density ratio of background signal and noise signal, by comparing with the threshold value of setting, judge whether to provide the guard signal of vapour generator leakage.
9. method according to claim 8, it is characterised in that, described liquid metal is sodium.
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| CN201610048541.0A CN105675651B (en) | 2016-01-25 | 2016-01-25 | The device and method of gas content in a kind of detection liquid metal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107179104A (en) * | 2017-05-10 | 2017-09-19 | 中国原子能科学研究院 | A kind of magneto liquid metal vortex-shedding meter and its application |
| CN107328531A (en) * | 2017-08-17 | 2017-11-07 | 合肥工业大学 | Bubble noise detector in a kind of sodium based on signal-to-noise ratio computation |
| CN107632058A (en) * | 2017-08-17 | 2018-01-26 | 重庆川仪自动化股份有限公司 | Bubble noise detector in a kind of sodium calculated based on coefficient correlation |
| CN109781356A (en) * | 2019-03-01 | 2019-05-21 | 合肥工业大学 | Bubble detection signal processing method in a kind of sodium based on peak-to-peak value standard deviation |
| CN109974793A (en) * | 2019-04-22 | 2019-07-05 | 合肥工业大学 | A kind of signal processing method of magnetic vortex street flowmeter measurement gassiness the flow of conductive liquid |
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| CN109974793A (en) * | 2019-04-22 | 2019-07-05 | 合肥工业大学 | A kind of signal processing method of magnetic vortex street flowmeter measurement gassiness the flow of conductive liquid |
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