CN100483458C - Two-way fuel ball counter circuit for sphere high temperature gas-cooling reactor - Google Patents
Two-way fuel ball counter circuit for sphere high temperature gas-cooling reactor Download PDFInfo
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- CN100483458C CN100483458C CNB2006100122663A CN200610012266A CN100483458C CN 100483458 C CN100483458 C CN 100483458C CN B2006100122663 A CNB2006100122663 A CN B2006100122663A CN 200610012266 A CN200610012266 A CN 200610012266A CN 100483458 C CN100483458 C CN 100483458C
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- 239000000446 fuel Substances 0.000 title claims abstract description 20
- 238000001816 cooling Methods 0.000 title 1
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000000523 sample Substances 0.000 claims description 10
- 239000004020 conductor Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910052734 helium Inorganic materials 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000002245 particle Substances 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 related fuel handling technique for a ball-bed reactor comprises: dividing the dual-way ball-over counter designed on the vortex sensor into A and B opposite respectively to LA and LB of vertex sensor coils, and changing the drive signal from original fixed-frequency constant voltage source into variable-frequency one by the series a signal generator, an impedance-voltage conversion circuit and a signal check circuit. This invention increases obviously the amplitude of over-ball signal, and reduces mutual inductance effect between coils efficiently.
Description
Technical field
The present invention is applied in the fuel handling system of pebble bed reactor, can the detection system pipeline in by the number of fuel sphere and the direction of passage that indicates fuel sphere.
Background technology
Tsing-Hua University's nuclear grinds the 10MW of institute pebble bed high temperature reactor and moves with the spherical graphite fuel element, and fuel coats particle dispersion in the graphite nodule of the about 60mm of diameter.Graphite nodule produces eddy current in alternating magnetic field, so the primary instrument of counter adopts the inductance type detector.Inductance type is surveyed based on electromagnetic induction, its essence is EDDY CURRENT.Detector is formed by coiling telefault on the hollow tube of making at pottery.When not having fuel element to pass through, the magnetic circuit of coil is helium and stupalith; When fuel element passed through coil, originally a part of magnetic circuit of helium was replaced by fuel element, produces eddy current on the fuel element, thereby the impedance that shows as wire loop changes.By secondary circuit impedance variation was converted into the ball pulse signal again.The primary instrument detector of bi-directional counter is made up of two groups of bridging coils, and the sequential of two mistake ball pulses that coil produced was judged the direction of ball during by the mistake ball.As requested, the distance of detector two coils is designed to 30mm.Because two coil distances are very near, cause mutual inductance effect obvious, under the noisy environment at the scene, the ball pulse sequence of crossing that two coils are produced blurs, the judgement of crossing direction of bowl that leads to errors easily.And existing counter adopts constant pressure source to drive, and crosses the ball weak output signal, causes leaking the meter situation easily and takes place.
Summary of the invention
The object of the present invention is to provide a kind of two-way counter circuit for sphere of pebble bed high temperature reactor that direction of bowl can accurately be judged and enlarged markedly the ball signal amplitude.
The invention is characterized in that this two-way counter circuit for sphere contains two groups of circuit, correspond respectively to two groups of coils; Every group of circuit all is connected in series successively by signal generating circuit, impedance-voltage conversion circuit and the signal deteching circuit of frequency adjustable and forms, wherein:
The signal generating circuit of frequency adjustable, contain A and B two-way:
The A road: Chuan Jie the A road signal generating circuit and the first voltage follower A1 successively, this A road signal generating circuit output adjustable frequency is ω
1The fixing sine wave signal of amplitude;
The B road: Chuan Jie B road signal generating circuit and the 7th voltage follower A7 successively, this B road signal generating circuit output adjustable frequency is ω
2The fixing sine wave signal of amplitude;
Impedance-voltage conversion circuit, contain A and B two-way:
The A road: Chuan Jie A road constant-current source circuit and tertiary voltage follower A3 successively, described A road constant-current source circuit contains:
Second operational amplifier A 2 meets variable resistor P3 between the output terminal of negative input end and the described first voltage follower A1, positive input terminal ground connection;
The shunt-resonant circuit, contain:
Resonant capacitance C2 is parallel between the negative input end and output terminal of this second operational amplifier A 2; Vortex sensor coil LA, this coil LA belongs to the through mode probe, form by the multi-layer conductor leads coiling, this coil LA is connected to the two ends of resonant capacitance C2 through two-wire cable B1, what A road signal generating circuit was exported to this coil LA is a sinusoidal current that character is constant, the variation that coil LA inductance is small promptly causes the marked change of LA, the impedance of C2 shunt circuit, directly causes the variation of second operational amplifier A, 2 output voltages;
The B road: Chuan Jie B road constant-current source circuit and the 9th voltage follower A9 successively, described B road constant-current source circuit contains:
The 8th operational amplifier A 8 meets variable resistor P8 between the output terminal of negative input end and described the 7th voltage follower A7, positive input terminal ground connection;
The shunt-resonant circuit, contain:
Resonant capacitance C8 is parallel between the negative input end and output terminal of the 8th operational amplifier A 8; Vortex sensor coil LB, this coil LB belongs to the through mode probe, form by the multi-layer conductor leads coiling, this coil LB is connected to the two ends of resonant capacitance C8 through two-wire cable B2, what B road signal generating circuit was exported to this coil LB is a sinusoidal current that character is constant, the variation that coil LB inductance is small promptly causes the marked change of LB, the impedance of C8 shunt circuit, directly causes the variation of the 8th operational amplifier A 8 output voltages;
Signal deteching circuit, contain A and B two-way:
The A road: the filtering circuit that constitutes by the rectification circuit that constitutes with four-operational amplifier A4, the 5th operational amplifier A 5 and form successively with the amplifying circuit serial connection that the 6th operational amplifier A 6 constitutes, what be output as the fuel sphere process crosses the ball pulse;
The B road: the filtering circuit that is made of the rectification circuit that constitutes with the tenth operational amplifier A 10, the 11 operational amplifier A 11 and form with the amplifying circuit serial connection that the 12 operational amplifier A 12 constitutes successively, what be output as the fuel sphere process crosses the ball pulse.
Below table 1 provided the circuit and the resonant parameter of two groups of wire loops, the inductance of two groups of coils of detector is all 0.4mH mutually, it is 10nF that A map shunt capacitance is set, B map shunt capacitance is 20nF, calculates A road resonance frequency f through the resonance formula
0Be 80kHz, B road resonance frequency f
0Be 56kHz.Curve L among Fig. 5
1, L
2Be respectively A road and the B road curve that resonant circuit impedance changes with coil inductance L under each self-resonant frequency, the subtle change of the caused coil inductance of eddy effect (0.4mH) causes the marked change of shunt circuit impedance when crossing ball as can be seen.Because two groups of coil close proximity (30mm) are so can produce the mutual inductance electric current, curve L among Fig. 5
3, L
4Be respectively the curve that the pairing impedance of mutual inductance electric current changes with coil inductance L in A road and the B road, as can be seen from the figure, under service condition, promptly when L=0.4mH, the impedance that the mutual inductance electric current is produced is very little, the more important thing is the small size variation along with inductance, this part impedance does not almost change, so the influence between two coils is very little; If two groups of coils adopt with driving frequently, the two-way tuning curve overlaps fully so, and this just means that two groups of coils can influence each other, promptly when fuel sphere is organized coil through A, B group wire loop also can be exported variable signal, will cause the pulse sequence interval of delta t of the last output of two-way circuit
1(Fig. 1) too small, thus the judgement of direction of bowl finally influenced.The present invention adopts alien frequencies to drive, and can obviously increase the pulse sequence interval of delta t
2(Fig. 2), thus increase the stability of system.
| L(mH) | C(nF) | ω 0(s -1) | f 0(kHz) | |
| A | 0.4 | 10 | 5.0E+05 | 80 |
| B | 0.4 | 20 | 3.5E+05 | 56 |
The circuit and the resonant parameter of table 1 liang group wire loop.
Description of drawings
Fig. 1 is existing counter circuit theory diagram.
Fig. 2 is for improving the counter circuit theory diagram.
Fig. 3 is the bi-directional counter circuit theory diagrams.
Fig. 4 is LC shunt-resonant circuit tuning curve figure, L---LC shunt circuit inductance; Z---LC shunt circuit impedance.
Fig. 5 is two groups of wire loops tuning curve figure under two frequencies respectively, L---LC shunt circuit inductance, and Z---LC shunt circuit impedance:
Embodiment
Cross the fuzzy shortcoming of ball pulse sequence in order to overcome existing bi-directional counter, invented new secondary circuit.The present invention can effectively reduce the mutual inductance effect of two coils of bi-directional counter, thereby strengthens two spacings of crossing the ball pulse, and clear two sequential of crossing the ball pulse are to guarantee to provide the judgement of crossing direction of bowl accurately.And enlarged markedly the ball signal amplitude, effectively stopped to cross the generation that ball leaks the meter situation.
Embodiments of the present invention are: the double frequency constant current source driving that the drive signal of coil is improved to frequency adjustable by the same frequency constant pressure source driving of original fixed-frequency, thereby adapted to on-the-spot complex environment to greatest extent, and reduce the mutual inductance effect of two coils effectively, increased the ball signal amplitude simultaneously.
The schematic block circuit diagram of existing counter is seen Fig. 1, and its signal generating circuit is made of crystal oscillator and frequency dividing circuit, can only produce fixed-frequency (ω
0) sinusoidal drive signals, and drive two groups of coil (LA of bi-directional counter through the two-way transformer with same signal, LB), fuel sphere causes that through coil the impedance in coil resonance loop changes, exported the ball pulse through impedance-voltage conversion circuit, can determine the direction of fuel sphere through bi-directional counter according to two sequential of passing by the ball pulse; Improve the schematic block circuit diagram of counter and see Fig. 2, signal generating circuit is made of chip IC L8038, and the frequency of the sinusoidal signal of its output is adjustable within the specific limits, the different (ω of two paths of signals generation circuit output two-way frequency
1, ω
2) sine wave signal drive bi-directional counter two groups of coils (LA, LB), sequential interval (the Δ t that crosses the ball pulse that follow-up signal testing circuit and existing basically identical, this circuit are exported
2) can be obviously greater than available circuit (Δ t
1), and cross ball pulse amplitude (A
2) also cross ball pulse amplitude (A greater than available circuit
1).
The circuit theory diagrams of bi-directional counter are seen Fig. 3, all available LF411 of operational amplifier among the figure.Signal generating circuit is made of chip IC L8038, by regulating P1 (P6), can output frequency be ω
1(ω
2) the fixing sine wave signal of amplitude, through voltage follower A1 (A7) output.Two groups of coils of bi-directional counter are connected to amplifier A2 (A8) through two-wire cable B1 (B2) respectively, two-wire cable and capacitor C 2 (C8) constitute the shunt-resonant circuit with two groups of coils respectively, C2 selects different appearance values with C8, so that the two-way resonant tank has different resonance frequency omega
1, ω
2, because by suitable parameter setting, the sine wave freuqency of ICL8038 output is adjustable continuously within the specific limits, so can make detector inductance, electric capacity parallel circuit be operated in resonant condition easily.Figure 4 shows that LC shunt circuit tuning curve, L
0The inductance of probe coil when not crossing ball, during fuel sphere process detector, cause the variation of coil inductance, as can be seen from the figure, when resonant condition, the small variation of coil inductance can cause the marked change of LC shunt circuit impedance, amplifier A2 (A8) is with slide rheostat P3 (P8) with by probe coil and cable, the LC shunt-resonant circuit that electric capacity is formed constitutes constant-current source circuit jointly, promptly the flow through current constant of LC shunt-resonant circuit, so the impedance variation of LC shunt-resonant circuit directly causes the variation of amplifier A2 (A8) output voltage, export via voltage follower A3 (A9).Follow-up signal deteching circuit is made up of rectification, filtering, amplifying circuit, provides the ball pulse excessively of fuel sphere process at last.
The magnetic focusing effect that a key factor of decision vortex finder detection sensitivity is a probe coil, coil that this instrument uses belongs to the through mode probe, be to form by the multi-layer conductor leads coiling, reduce the electromagnetism equivalent diameter of coil so, focus on thereby strengthen excitation field and make it, just become the key that improves detector sensitivity.The form of driving source and the equivalent diameter of detecting coil have accordingly gets in touch.Driving source is divided into two kinds of constant voltage excitation and constant current drives, what constant voltage excitation was meant that the eddy current detection instrument exports to probe coil is a constant amplitude sinusoidal voltage, under this energisation mode, the electromagnetism equivalent diameter perseverance of lattice coil is greater than its internal diameter, and may be greater than its external diameter; What constant current drive was meant that the eddy current detection instrument exports to probe coil is a constant amplitude sinusoidal current, and under this energisation mode, the electromagnetism equivalent diameter of lattice coil is not only less than its external diameter, even also can be less than its internal diameter.The electromagnetism equivalent diameter is more little, and the magnetic field that produces in crossing the bulb road is concentrated more, strong more, and time rate of change is just big more, thus the sensitivity that can greatly improve counter.So the constant current source exciting circuit that the present invention taked has improved detector sensitivity effectively, the A of ball pulse amplitude excessively of counter circuit output
2(Fig. 2) the obvious A of ball pulse amplitude excessively greater than primary circuit
1(Fig. 1).
Claims (4)
1, the two-way counter circuit for sphere of pebble bed high temperature reactor is characterized in that, this two-way counter circuit for sphere contains two groups of circuit, corresponds respectively to two groups of coils; Every group of circuit all is connected in series successively by signal generating circuit, impedance-voltage conversion circuit and the signal deteching circuit of frequency adjustable and forms, wherein:
The signal generating circuit of frequency adjustable, contain A and B two-way:
The A road: Chuan Jie the A road signal generating circuit and the first voltage follower A1 successively, this A road signal generating circuit output adjustable frequency is ω
1The fixing sine wave signal of amplitude;
The B road: Chuan Jie B road signal generating circuit and the 7th voltage follower A7 successively, this B road signal generating circuit output adjustable frequency is ω
2The fixing sine wave signal of amplitude;
Impedance-voltage conversion circuit, contain A and B two-way:
The A road: Chuan Jie A road constant-current source circuit and tertiary voltage follower A3 successively, described A road constant-current source circuit contains:
Second operational amplifier A 2 meets variable resistor P3 between the output terminal of negative input end and the described first voltage follower A1, positive input terminal ground connection;
The shunt-resonant circuit, contain:
Resonant capacitance C2 is parallel between the negative input end and output terminal of this second operational amplifier A 2; Vortex sensor coil L
A, this coil L
ABelong to the through mode probe, form this coil L by the multi-layer conductor leads coiling
ABe connected to the two ends of resonant capacitance C2 through two-wire cable B1, A road signal generating circuit is exported to this coil L
ABe a sinusoidal current that character is constant, coil L
AThe variation that inductance is small promptly causes L
A, the impedance of C2 shunt circuit marked change, directly cause the variation of second operational amplifier A, 2 output voltages;
The B road: Chuan Jie B road constant-current source circuit and the 9th voltage follower A9 successively, described B road constant-current source circuit contains:
The 8th operational amplifier A 8 meets variable resistor P8 between the output terminal of negative input end and described the 7th voltage follower A7, positive input terminal ground connection;
The shunt-resonant circuit, contain:
Resonant capacitance C8 is parallel between the negative input end and output terminal of the 8th operational amplifier A 8; Vortex sensor coil L
B, this coil L
BBelong to the through mode probe, form this coil L by the multi-layer conductor leads coiling
BBe connected to the two ends of resonant capacitance C8 through two-wire cable B2, what B road signal generating circuit was exported to this coil LB is a sinusoidal current that character is constant, coil L
BThe variation that inductance is small promptly causes L
B, the impedance of C8 shunt circuit marked change, directly cause the variation of the 8th operational amplifier A 8 output voltages;
Signal deteching circuit, contain A and B two-way:
The A road: the filtering circuit that constitutes by the rectification circuit that constitutes with four-operational amplifier A4, the 5th operational amplifier A 5 and form successively with the amplifying circuit serial connection that the 6th operational amplifier A 6 constitutes, what be output as the fuel sphere process crosses the ball pulse;
The B road: the filtering circuit that is made of the rectification circuit that constitutes with the tenth operational amplifier A 10, the 11 operational amplifier A 11 and form with the amplifying circuit serial connection that the 12 operational amplifier A 12 constitutes successively, what be output as the fuel sphere process crosses the ball pulse.
2. the two-way counter circuit for sphere of pebble bed high temperature reactor according to claim 1, it is characterized in that, described A road signal generating circuit outputs signal to the A roadlock anti--voltage conversion circuit, this A roadlock is anti--and voltage conversion circuit outputs signal to A road signal deteching circuit; Described B road signal generating circuit outputs signal to the B roadlock anti--voltage conversion circuit, this B roadlock is anti--and voltage conversion circuit outputs signal to B road signal deteching circuit.
3. the two-way counter circuit for sphere of pebble bed high temperature reactor according to claim 1 is characterized in that, described A road signal generating circuit and B road signal generating circuit all adopt chip IC L8038.
4. the two-way counter circuit for sphere of pebble bed high temperature reactor according to claim 1 is characterized in that described operational amplifier, voltage follower all adopt chip LF411.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100122663A CN100483458C (en) | 2006-06-15 | 2006-06-15 | Two-way fuel ball counter circuit for sphere high temperature gas-cooling reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100122663A CN100483458C (en) | 2006-06-15 | 2006-06-15 | Two-way fuel ball counter circuit for sphere high temperature gas-cooling reactor |
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| Publication Number | Publication Date |
|---|---|
| CN1866278A CN1866278A (en) | 2006-11-22 |
| CN100483458C true CN100483458C (en) | 2009-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100122663A Active CN100483458C (en) | 2006-06-15 | 2006-06-15 | Two-way fuel ball counter circuit for sphere high temperature gas-cooling reactor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10553323B2 (en) * | 2014-01-29 | 2020-02-04 | Tsinghua University | Fuel ball detecting method and system with self-diagnosis function |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109801725B (en) * | 2018-12-07 | 2020-07-07 | 清华大学 | Single-way device applied to ball bed pile |
| CN110211716B (en) * | 2019-06-03 | 2021-01-22 | 清华大学 | Simulation debugging method and device for ball passing counter |
| CN114005561B (en) * | 2021-10-29 | 2022-10-04 | 华能山东石岛湾核电有限公司 | High-temperature gas cooled reactor fuel element conveying control method and system |
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|---|---|---|---|---|
| CN1083255A (en) * | 1993-04-09 | 1994-03-02 | 清华大学 | Suction-type conveying ball circulation device for high-temp gas-cooled reaction |
| CN1090673A (en) * | 1993-10-29 | 1994-08-10 | 清华大学 | The discharger of pebble bed high temperature reactor fuel element |
| CN1103504A (en) * | 1993-12-01 | 1995-06-07 | 中国核动力研究设计院 | Critical heat flow density judging and cut-off power control system |
-
2006
- 2006-06-15 CN CNB2006100122663A patent/CN100483458C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1083255A (en) * | 1993-04-09 | 1994-03-02 | 清华大学 | Suction-type conveying ball circulation device for high-temp gas-cooled reaction |
| CN1090673A (en) * | 1993-10-29 | 1994-08-10 | 清华大学 | The discharger of pebble bed high temperature reactor fuel element |
| CN1103504A (en) * | 1993-12-01 | 1995-06-07 | 中国核动力研究设计院 | Critical heat flow density judging and cut-off power control system |
Non-Patent Citations (1)
| Title |
|---|
| HTR-10智能化数字式过球计数系统. 李华，李富，刘继国，黄鹏.核电子学与探测技术，第23卷第4期. 2003 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10553323B2 (en) * | 2014-01-29 | 2020-02-04 | Tsinghua University | Fuel ball detecting method and system with self-diagnosis function |
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| CN1866278A (en) | 2006-11-22 |
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Effective date of registration: 20210119 Address after: 100193 building 26, Zhongguancun Software Park, 8 Dongbeiwang West Road, Haidian District, Beijing Patentee after: CHINERGY Co.,Ltd. Address before: 100084 mailbox 100084-82, Beijing City Patentee before: TSINGHUA University |
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