CN101174483A - Fuel ball bidirectional ball-passing test device of butt assembly type ball bed high temperature gas-cooled reactor - Google Patents
Fuel ball bidirectional ball-passing test device of butt assembly type ball bed high temperature gas-cooled reactor Download PDFInfo
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- CN101174483A CN101174483A CN200710178131.9A CN200710178131A CN101174483A CN 101174483 A CN101174483 A CN 101174483A CN 200710178131 A CN200710178131 A CN 200710178131A CN 101174483 A CN101174483 A CN 101174483A
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- 238000012360 testing method Methods 0.000 title claims description 43
- 239000000446 fuel Substances 0.000 title abstract description 24
- 230000002457 bidirectional effect Effects 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 239000003758 nuclear fuel Substances 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims abstract 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 15
- 238000009434 installation Methods 0.000 abstract description 4
- 230000003750 conditioning effect Effects 0.000 abstract description 3
- 230000002285 radioactive effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000003471 anti-radiation Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to a dual-way passing detector of opposite-mounted sphere bed high temperature gas-cooled reactor fuel sphere, comprising an exciting unit, a sensing unit and a signal conditioning unit, wherein, the sensing unit comprises an exciting coil and two detection coils; the exciting coil and the detection coils are symmetrically arranged on two sides of a sphere conveying steel tube; signal power of sinusoidal voltage is amplified by the exciting unit and transmitted to the exciting coil of the sensing unit; the two detection coils of the signal conditioning unit and the sensing unit are connected, two ways of voltage signal of the detection coils are calculated and processed, and sine-wave voltage signal indicating sphere passing and passing direction is outputted; non-contact detection is adopted for detecting radioactive fuel sphere. The invention has the advantages of high signal-to-noise ratio of output signal, strong interference resistance, high resolution for continuous passing and passing of more than half a sphere as well as simple structure, convenient installation without damage to sphere conveying steel tube in construction.
Description
Technical field
The invention belongs to the element testing technical field, particularly a kind of to the two-way ball pick-up unit of crossing of dress formula pebble bed high temperature reactor fuel sphere.
Background technology
The ball bed high temperature gas cooled reactor adopts the spherical graphite fuel element, and fuel coats particle dispersion in the graphite nodule of about 60mm diameter.These fuel sphere looselys are deposited in the reactor core, realize not shutdown loading and unloading fuel by fuel handling system during reactor operation.Therefore, must judge accurately continuously, write down and add up by quantity, to guarantee the normal safe operation of reactor to the fuel sphere at each pipeline place in the fuel handling system.
At present, the fuel sphere pick-up unit that uses on pebble bed reactor mainly contains two kinds of penetration piece formula and sidewall perforating types.The penetration piece formula is that the hollow tube that utilizes pottery to make replaces one section steel pipe of losing, and two magnetic test coils of coiling detect on ceramic pipe.Its principle of work be utilize fuel sphere by the time eddy current that produces cause that the variation of magnetic test coil induction reactance judged whether ball.The fuel sphere of the THTR heap of high temperature gas-cooled experimental reactor of China HTR-10 and Germany detects and all adopts this device.The sidewall perforating type is by in the steel pipe sidewall punching of losing, and two v block cores that are wound with magnetic test coil are stretched in the hole, utilizes electromagnetic type to detect ball near the principle of switch.Above-mentioned two kinds of pick-up units mainly have the following disadvantages in industry spot is used:
(1) installation of sensor has destroyed the integrality of the steel pipe of losing, and is the high pressure impermeability of the steel pipe that guarantees to lose, the assembly structure complexity of pick-up unit, install loaded down with trivial details;
(2) after sensor breaks down, the maintenance and more emat sensor must dismantle the bulb road, the engineering time is long, influences the continuous operation of reactor;
(3) sensor element contacts with the radioactive fuel element, to whole detection device material anti-radiation requirement height, influences the serviceable life of sensor.
Han Zandong etc. (pebble bed reactor fuel handling system such as patent [1] Han Zan east Liu Ji state Ma Qingxian is crossed ball detection method and fitted outside detection system [P]. Chinese patent: 1819065A, 2006-08-16) proposed a kind of novel fitted outside pick-up unit, utilized to be coated on that two magnetic test coils and drive coil of coiled semicircle shape carried out the ball acquisition of signal outside the bulb road.Though this device has solved the drawback of penetration piece formula and sidewall perforating type detector to a great extent, but still comes with some shortcomings:
(1) on the detection method, its drive coil and magnetic test coil coiled semicircle shape, and be installed in steel pipe the same side, and cause the useful flux that penetrates the steel pipe of losing few on the one hand, launching efficiency is low, and detection signal is subjected to coil and the lifting between the steel pipe of losing influences greatly; Make that on the other hand the magnetic test coil loop area is big, detection signal excited target signal and space radiation serious interference, signal to noise ratio (S/N ratio) is low.
(2) circuit is realized, this device adopts many discrete components that detection signal is carried out amplitude discrimination and phase discrimination processing, makes the circuit complexity, introduces interference easily and exists temperature to float problem, and circuit long-play reliability is not high.
(3) fit on, this device magnetic test coil and drive coil need to nestle up the outer wall of steel pipe of losing and install on skeleton, and the pipe surface temperature of losing is spent up to 200 and have certain nuclear radiation, this requires coil and the high temperature resistant radiation hardness of framework material, makes that coil cost cost is high and influences its serviceable life.
Summary of the invention
The present invention provides a kind of to the two-way ball pick-up unit of crossing of dress formula pebble bed high temperature reactor fuel sphere especially in order to solve the deficiency of existing ball pick-up unit.
Technical scheme of the present invention is as follows:
A kind of to the two-way ball pick-up unit of crossing of dress formula pebble bed high temperature reactor fuel sphere, form by exciting unit, sensing unit and signal condition unit.Sensing unit comprises a drive coil and two magnetic test coils, and drive coil and magnetic test coil symmetry are installed in the steel pipe both sides of losing.Exciting unit provides ac-excited to sensing unit, makes drive coil produce alternating magnetic field, is coupled to magnetic test coil through lose steel pipe and helium, and produces induced voltage thereon.When fuel sphere passed through, its eddy current that induces caused that magnetic test coil voltage changes.The signal condition unit differs from this two-way voltage signal and than computing and amplification, obtains the sinusoidal wave voltage signal.This characterization cross ball and cross direction of bowl, can realize the two-way ball count of crossing based on this signal.
Drive coil in the described sensing unit and magnetic test coil all turn to saddle, two magnetic test coil coiling symmetries are consistent, be installed in steel pipe one side of losing along the steel pipe axial parallel of losing, drive coil coiling width is installed in the opposite side of the steel pipe of losing greater than magnetic test coil over against magnetic test coil.
It is that core makes up that described exciting unit amplifies chip with audio frequency, and the simple alternating current pumping signal is carried out power amplification, exports to the drive coil of sensing unit.
Described signal condition unit is that core makes up with one chip linear displacement differential transformer (LVDT) signal conditioner, and induced voltage on two magnetic test coils of described sensing unit is carried out (V
A-V
B)/(V
A+ V
B) difference and than computing and amplify output class sine voltage signal.
Described anchor clamps adopt stainless steel material, are designed to two halves to the dress formula, comprise outer cover, clip, drive coil intermediate plate and magnetic test coil intermediate plate.Drive coil and magnetic test coil are fixed by corresponding intermediate plate, are installed in the steel pipe both sides of losing by the clip symmetry again, and coil is lifted from steel tube surface and left the distance that is not less than 10mm.Outer cover is fixed on the clip, and whole sensing unit is encapsulated, and can play shielding outside electromagnetic interference and dustproof effect.
The present invention has following advantage:
(1) sensing unit is simple in structure, volume is little, and is easy for installation, need not to destroy the steel pipe of losing, and the integrality and the high pressure impermeability of the steel pipe that guaranteed to lose have reduced radiation pollution.
(2) drive coil of sensing unit and magnetic test coil turn to the shape of a saddle and adopt custom-designed anchor clamps to carry out the dress formula is installed, make its magnetic circuit coupling efficiency higher on the one hand, the original signal characteristic is good, anti-interference strong with the anti-vibration ability, coil need not skeleton on the other hand, easy accessibility, processing cost is low.
(3) the signal condition unit adopts the integrated conditioning chip of one chip that two magnetic test coils are powered on and compresses into row (V
A-V
B)/(V
A+ V
B) difference and than computing and amplify, effectively suppressed the common mode interference of magnetic test coil, and reduced driving voltage and change crossing the influence of ball signal, improved signal to noise ratio (S/N ratio) and the reliability of crossing the ball signal greatly.Simultaneously, this algorithm has also effectively suppressed the Lift-off effect between coil and the pipeline, and coil keeps certain distance with the steel tube surface of losing during installation, and untouchable mode is surveyed has radioactive fuel sphere.Therefore, reduced the high temperature resistant and radiation-resistant requirement of pick-up unit material, improved the sensing unit working environment, helped it and move reliably and with long-term.
(4) the sinusoidal wave voltage signal of this device output zero passage and the basic symmetry of positive negative wave.This signal can characterize direction of bowl, and continuous ball and more than half ball crossed crossed ball and do not had waveform aliasing and distortion problem, signal to noise ratio (S/N ratio) height.
In addition, the present invention crosses the ball detection except that being used for pebble bed high temperature reactor fuel sphere handling system, under the prerequisite that does not break away from the principle of the invention, also can be applied to the detection of conduction, magnetic conduction substance in the thick walled steel tube.
Description of drawings
Fig. 1 is that the present invention is to the two-way ball pick-up unit theory diagram of crossing of dress formula.
Fig. 2 is to dress formula sensing unit structural representation.
Fig. 3 is the exciting unit schematic diagram.
Fig. 4 is a signal condition unit schematic diagram.
Fig. 5 for have ball and no ball by the time signal condition unit output waveform, wherein Fig. 5 a do not have ball by the time waveform, Fig. 5 b forward is crossed the ball output waveform, the reverse mistake of Fig. 5 c ball output waveform.
Signal condition unit output waveform when Fig. 6 is the continuous mistake of a string ball ball.
Fig. 7 is more than half ball signal condition unit output waveform when crossing ball.
1 is drive coil L in the accompanying drawing
E, 2 is magnetic test coil L
A, 3 is magnetic test coil L
B, 4 is clip, and 5 is the stainless steel outer cover, and 6 are the steel pipe of losing, and 7 is fuel sphere, and 8 is exciting unit, and 9 is sensing unit, and 10 is the signal condition unit.
Embodiment
Below in conjunction with the drawings and the specific embodiments the present invention is described in further detail.
The two-way ball of crossing of the present invention detects principle as shown in Figure 1.Exciting unit 8 produces the drive coil 1 that the simple alternating current pumping signal is exported to sensing unit 9, makes it produce alternating magnetic field.The helium of this magnetic field in lose steel pipe 6 and pipe is coupled to two magnetic test coils 2 in opposite and 3, and produces induced voltage thereon.These two magnetic test coils 2 are consistent with 3 coiling parameters, no fuel sphere 7 by the time, induce on it that amplitude equates and with pumping signal with sinusoidal voltage signal V frequently
A, V
BWhen fuel sphere 7 passes through,, cause V on magnetic test coil 2 and 3 voltages because the electric conductivity of graphite induces eddy current on the fuel sphere
A, V
BChange.10 pairs of these two-way voltage signals in signal condition unit carry out (V
A-V
B)/(V
A+ V
B) difference and than computing and amplify the sinusoidal wave voltage signal of output zero passage and the basic symmetry of positive negative wave.This characterization cross ball and cross direction of bowl, by analysis and processing, can realize that the two-way ball of crossing judges to this signal.
The circuit theory of signal condition unit 10 as shown in Figure 4.With one chip linear displacement differential transformer (LVDT) signal conditioner AD598 is that core makes up.AD598 is a highly integrated signal condition chip, and its transport function is
I wherein
REFBe fixed value 500 μ A.
By regulating the R2 resistance is its enlargement factor of scalable.Simultaneously, the AD598 chip internal has the low-distortion sine wave oscillator and the output amplifier thereof that produce sinusoidal signal, can be directly used in the sine wave signal input of exciting unit 8.Because AD598 differs from the voltage of two magnetic test coils 2,3 and amplifies than computing, do not need the amplitude of pumping signal to keep constant, simultaneously also suppress coil and the Lift-off effect of 6 of the steel pipes of losing, made the antijamming capability of ball signal and signal to noise ratio (S/N ratio) be largely increased.The voltage signal of its output zero passage and the basic symmetry of positive negative wave, this characterization cross ball and cross direction of bowl, can realize that the two-way ball of crossing judges.
Shown in Fig. 5 a is when no fuel sphere 7 passes through in the steel pipe 6 of losing, the waveform of this pick-up unit output; Shown in Fig. 5 b is when having single fuel sphere 7 forwards to pass through in the steel pipe 6 of losing, the waveform of its output; Shown in Fig. 5 c is when having single fuel sphere 7 oppositely to pass through in the steel pipe 6 of losing, the waveform of its output; Shown in Figure 6 is a succession of fuel sphere 7 waveform when losing steel pipe 6; Shown in Figure 7 is more than half fuel sphere 7 waveform when losing steel pipe 6.
The above only is a preferred implementation of the present invention, should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, also can be applied to the detection of other materials, for example: conduction, magnetic conduction substance detect in the thick walled steel tube.
Claims (6)
1. one kind to the two-way ball pick-up unit of crossing of dress formula pebble bed high temperature reactor fuel sphere, is made up of exciting unit, sensing unit and signal condition unit, it is characterized in that:
Sensing unit comprises a drive coil and two magnetic test coils, and drive coil and magnetic test coil symmetry are installed in the steel pipe both sides of losing;
Exciting unit carries out the drive coil that sensing unit is exported in power amplification with sine voltage signal;
The signal condition unit links to each other with two magnetic test coils of sensing unit, the two-way voltage signal of magnetic test coil is carried out calculation process after, output can characterize ball and cross the sinusoidal wave voltage signal of direction of bowl.
2. according to claim 1 a kind of to the two-way ball pick-up unit of crossing of dress formula pebble bed high temperature reactor fuel sphere, it is characterized in that:
Drive coil in the described sensing unit and magnetic test coil all turn to saddle;
Two magnetic test coil coiling symmetries are consistent, and the steel pipe axial parallel is installed in steel pipe one side of losing along losing;
Drive coil coiling width is installed in the opposite side of the steel pipe of losing greater than magnetic test coil over against magnetic test coil.
3. according to claim 1 a kind of to the two-way ball pick-up unit of crossing of dress formula pebble bed high temperature reactor fuel sphere, it is characterized in that: it is that core makes up that described exciting unit amplifies chip with audio frequency, the simple alternating current pumping signal is carried out power amplification, export to the drive coil of sensing unit.
4. according to claim 1 a kind of to the two-way ball pick-up unit of crossing of dress formula pebble bed high temperature reactor fuel sphere, it is characterized in that: described signal condition unit is that core makes up with LVDT one chip linear displacement differential transformer signal conditioner, to induced voltage signal V on two magnetic test coils of sensing unit
AAnd V
BCarry out (V
A-V
B)/(V
A+ V
B) difference and than computing and amplify.
5. according to claim 1 and 2 a kind of to the two-way ball pick-up unit of crossing of dress formula pebble bed high temperature reactor fuel sphere, it is characterized in that: the coil of described sensing unit all is a hollow-core construction, adopts the stainless steel anchor clamps to be fixedly mounted on the steel pipe both sides of losing.
6. according to claim 5 a kind of to the two-way ball pick-up unit of crossing of dress formula pebble bed high temperature reactor fuel sphere, it is characterized in that:
Described stainless steel jig Design comprises outer cover, clip, drive coil intermediate plate and magnetic test coil intermediate plate into two to the dress formula;
Drive coil and magnetic test coil are fixed by corresponding intermediate plate, by clip its symmetry are installed in the steel pipe both sides of losing again;
The stainless steel outer cover is fixed on the clip, and sensing unit is encapsulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710178131.9A CN101174483A (en) | 2007-11-27 | 2007-11-27 | Fuel ball bidirectional ball-passing test device of butt assembly type ball bed high temperature gas-cooled reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710178131.9A CN101174483A (en) | 2007-11-27 | 2007-11-27 | Fuel ball bidirectional ball-passing test device of butt assembly type ball bed high temperature gas-cooled reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101174483A true CN101174483A (en) | 2008-05-07 |
Family
ID=39422910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710178131.9A Pending CN101174483A (en) | 2007-11-27 | 2007-11-27 | Fuel ball bidirectional ball-passing test device of butt assembly type ball bed high temperature gas-cooled reactor |
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| Country | Link |
|---|---|
| CN (1) | CN101174483A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101719387B (en) * | 2009-12-10 | 2012-02-08 | 清华大学 | External ball passage detecting method and device for ball-bed high temperature gas cooled reactor |
| CN103761995A (en) * | 2014-01-29 | 2014-04-30 | 清华大学 | High temperature gas cooled reactor outside fitted ball passing detection method and system having self-diagnostic function |
| CN104019833A (en) * | 2014-06-13 | 2014-09-03 | 四川亚美动力技术有限公司 | Engine oil pin position sensor detecting circuit |
| CN105448360A (en) * | 2015-12-22 | 2016-03-30 | 清华大学 | Detection system for spheres passing through approximately-isodiametric sphere-flow pipeline based on vibration signal processing and method |
| CN110400645A (en) * | 2019-07-30 | 2019-11-01 | 清华大学 | Combined type crosses ball detection sensor and its detection method |
-
2007
- 2007-11-27 CN CN200710178131.9A patent/CN101174483A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101719387B (en) * | 2009-12-10 | 2012-02-08 | 清华大学 | External ball passage detecting method and device for ball-bed high temperature gas cooled reactor |
| CN103761995A (en) * | 2014-01-29 | 2014-04-30 | 清华大学 | High temperature gas cooled reactor outside fitted ball passing detection method and system having self-diagnostic function |
| WO2015113327A1 (en) * | 2014-01-29 | 2015-08-06 | Tsinghua University | Fuel ball detecting method and system with self-diagnosis function |
| US10553323B2 (en) * | 2014-01-29 | 2020-02-04 | Tsinghua University | Fuel ball detecting method and system with self-diagnosis function |
| CN104019833A (en) * | 2014-06-13 | 2014-09-03 | 四川亚美动力技术有限公司 | Engine oil pin position sensor detecting circuit |
| CN104019833B (en) * | 2014-06-13 | 2016-06-08 | 四川亚美动力技术有限公司 | Engine oil needle position sensor detection circuit |
| CN105448360A (en) * | 2015-12-22 | 2016-03-30 | 清华大学 | Detection system for spheres passing through approximately-isodiametric sphere-flow pipeline based on vibration signal processing and method |
| CN110400645A (en) * | 2019-07-30 | 2019-11-01 | 清华大学 | Combined type crosses ball detection sensor and its detection method |
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Open date: 20080507 |