CN100483560C - Overball inspection and external inspecting system for loading-unloading system of ball-bed piled fuel component - Google Patents
Overball inspection and external inspecting system for loading-unloading system of ball-bed piled fuel component Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
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Abstract
The ball bed piles the fuel element loading and unloading systematic ball examination method and outside installs the type examination system to belong to the ball bed type reactor fuel part examination area of technology. Is by installs has installed the type examination system outside ball pipeline outside, examines two examination coils using the distant field turbulent flow principle the voltage, and carries on the demodulation keleck and phase demodulation processing separately to this two examination coil voltage, obtains contains has had ball information demodulation keleck output voltage UOA and phase demodulation output voltage UOP, then carries on to this voltage UOA and UOP further analyzes and processing, thus judges in the ball pipeline whether has the ball process. This invention also proposed outside installs the type examination system. Uses this invention, the installment and the service does not need to destroy the ball pipeline, guaranteed installs the ex-denning pipeline the integrity and high-pressured gas tightness, reduces the radiation pollution; The sensor coil, the skeleton and other appendices with the radioactive fuel ball contact, are directly low to the entire examination sensor material radioresistance request, are advantageous in enhance the sensor the service life.
Description
Technical field:
The pebble bed reactor fuel handling system crosses the ball detection method and the fitted outside detection system belongs to ball bed formula reactor fuel element detection technique field.
Background technology
At present, energy shortage has become one of main difficult problem of puzzlement countries in the world, and the sustainable development of China has also been constituted stern challenge, and rational and orderly ground development nuclear energy is the important means of solution energy crisis, has been subjected to national great attention.The ball bed high temperature gas cooled reactor is a kind of advanced person's a reactor type, has the generating efficiency height, and security is good, can carry out advantages such as fuel handling under the situation of not shutdown.German AVR heap is arranged the ball bed high temperature gas cooled reactor that has built up in the world and THTR piles, the high temperature gas-cooled experimental reactor of HTR-10 of China, the South Africa PBMR that is building in addition heap.
In order to realize the continuous operation of ball bed high temperature gas cooled reactor, must under the situation of not shutdown, realize effective control of fuel element loading and unloading.For this reason, must be that the fuel sphere of matrix accurately detects and counts to the ducted graphite nodule of charging hole, discharge pipe and spentnuclear fuel and graphite, this is the purpose of this patent just.
Accuracy, security and reliability are the basic demands to the fuel element pick-up unit.The fuel element pick-up unit that uses on pebble bed reactor at present has two kinds (all having utilized the influence principle of the graphite of conduction to coil induction reactance).The one, built-in type: in stainless steel is crossed the bulb road, pre-install magnetic test coil, fuel sphere by the time coil induction reactance can change, variation by magnetic test coil induction reactance comes to such an extent that be the ball signal, and what high temperature gas-cooled experimental reactor of HTR-10 of the AVR heap of Germany, THTR heap, China and the heap of the South Africa PBMR in building adopted is exactly this device.The 2nd, sidewall punching installing type: cross the sidewall punching of bulb road at stainless steel, installation and measuring coil in the hole, this device is similar to electromagnetic type near switch, and Germany once adopted this sensor to carry out the design of 200MW module stack loading and unloading material system.
More than two kinds of sensors have following problem in use:
(1) sensor is installed and has all been destroyed the integrality of crossing the bulb road, and sensor construction and mounting means must guarantee the high pressure impermeability in bulb road, so the sensor construction complexity, and difficulty is installed.
(2) after sensor breaks down, the maintenance and more emat sensor must dismantle the bulb road, the engineering time is long, causes radiation pollution easily, influences the utilizability of reactor.
(3) cell winding, skeleton and other annex directly contact with the radioactive fuel ball, and be very high to the radiation resistance requirement of whole detecting sensor material, influenced the serviceable life of sensor.
Summary of the invention:
The objective of the invention is to,, proposed a kind of utilization and utilized fitted outside to cross ball detection detection system, adopt far-field eddy to penetrate the method that stainless steel pipes realizes that fuel element detects at the deficiency that had the ball pick-up unit now.This method has following advantage:
(1) sensor is installed and be need not to destroy the bulb road, guaranteed the integrality and the high pressure impermeability of loading and unloading pipe materials, and sensor construction is simple, and is easy for installation.
(2) cell winding, skeleton and other annex directly do not contact (middle by stainless steel tube wall separate) with the radioactive fuel ball, the radiation resistance of whole detecting sensor material are required lower, help improving sensor serviceable life.
(3) after sensor breaks down, maintenance and more emat sensor need not to dismantle the bulb road, the engineering time is short, radiation pollution is little.The integrality and the high pressure impermeability of loading and unloading pipe materials have been guaranteed; Convenience and dependability that sensor is installed have been solved; Improved the serviceable life of sensor.
The invention is characterized in, be to be installed in the fitted outside detection system outside the bulb road, utilize the voltage of two magnetic test coils of far-field eddy principle detection, and the voltage of these two magnetic test coils is examined the width of cloth and phase discrimination processing respectively, obtain including the inspection width of cloth output voltage U of ball information
OAWith the phase demodulation output voltage U
OP, then in single-chip microcomputer to this voltage U
OAAnd U
OPFurther analyze and handle, thereby judged whether the ball warp mistake is arranged in the bulb road.
In described single-chip microcomputer, process is examined the amplitude detection voltage U of the width of cloth and phase discrimination processing
OAWith the phase-detection voltage U
OPAnalyze and handle, judged whether ball, its step is as follows:
1) initialization: given amplitude voltage detecting threshold value Uthl, Uth2;
Given phase voltage detection threshold Uth3, Uth4;
Given single is crossed the time range Δ T of ball signal Processing;
Given amplitude detection voltage U
OAThe normality value, promptly do not have ball by the time U
OAMagnitude of voltage;
Given phase-detection voltage U
OPThe normality value, promptly do not have ball by the time U
OPMagnitude of voltage;
2) gather the amplitude detection voltage U
OAWith the phase-detection voltage U
OP
3) carry out the judgement of following condition:
Condition (1) is carried out amplitude threshold and is judged: U
OAIn the Δ T time, whether cut respectively twice by Uthl and Uth2;
Condition (2) is carried out phase threshold and is judged: U
OPIn the Δ T time, whether cut respectively twice by Uth3 and Uth4;
Condition (3), carry out amplitude wave-shape and judge: whether the shape of twocouese waveform has similarity;
Condition (4), carry out phase waveform and judge: whether the shape of twocouese waveform has similarity;
In the Δ T time, when satisfy simultaneously condition (1) and (3), or condition (2) and (4) satisfy simultaneously, or condition (1)～(4) have been judged as ball and have passed through when satisfying simultaneously, and condition (1)～(4) are all resetted, and continue judgement; Otherwise continue to judge.Definite method of described threshold value Uthl, Uth2, Uth3, Uth4 is as follows:
Uthl=(U
OANormality value+U when having ball to pass through
OAMaximal value)/2;
Uth2=(U
OANormality value+U when having ball to pass through
OAMinimum value)/2;
Uth3=(U
OPNormality value+U when having ball to pass through
OPMaximal value)/2;
Uth4=(U
OPNormality value+U when having ball to pass through
OPMinimum value)/2;
It's the time interval of the time range Δ T=fuel sphere of ball signal Processing by two magnetic test coil centers is past described single.
The similarity of the shape of described twocouese waveform to amplitude wave-shape judges, be by in interval [t1, t4] to U
OACarry out integration, if integrated value equals U
OAThe normality value, show that then waveform has similarity; Described t1 is that Uth1 cuts U for the first time in the Δ T time
OATime, described t4 is that Uth2 cuts U for the second time in the Δ T time
OATime.
The similarity of the shape of described twocouese waveform to phase waveform judges, be by in interval [t5, t8] to U
OPCarry out integration, if integrated value equals U
OPThe normality value, show that then waveform has similarity; Described t5 is that Uth3 cuts U for the first time in the Δ T time
OPTime, described t8 is that Uth4 cuts U for the second time in the Δ T time
OPTime.
According to crossing the fitted outside detection system that the ball detection method designs, it is characterized in that it contains:
Sensor: contain at least two coils that were coated on outside the bulb road, receive the pumping signal of exciting unit, produce stable alternating electromagnetic field in the space, and detect two voltage signals that reflected ball information, input signal detection and conditioning unit;
Exciting unit: receive the control signal of single-chip microcomputer, produce fixed ampllitude simple alternating current pumping signal, act on the drive coil of sensor, produce stable alternating electromagnetic field in the space;
Input and conditioning unit: the sine voltage signal of two magnetic test coil outputs of receiving sensor, amplify and Phase Processing, the signal after handling is outputed to amplitude discriminating unit and phase sensitive detection unit respectively;
The amplitude discriminating unit: received signal detects and two voltage signals of conditioning unit output, detects the changes in amplitude of these two signals, the voltage signal U of output-response changes in amplitude
OA
The phase sensitive detection unit: received signal detects and two voltage signals of conditioning unit output, detects the phase change of these two signals, the voltage signal U of output-response phase change
OP
Single-chip microcomputer: output a control signal to exciting unit, receive the signal of amplitude discriminating unit and phase sensitive detection unit output simultaneously, by analysis, determined whether the ball warp mistake.
Described sensor is two magnetic test coils that were coated on coiled semicircle shape outside the bulb road, the adjacent bulb pipeline outer wall of crossing of described two magnetic test coils, and arrange along the length direction of crossing the bulb road, the winding method of these two magnetic test coils, material therefor and coil turn are identical; Also contain a drive coil, the width of this drive coil coiling is greater than described magnetic test coil.
Described exciting unit contains DDS sinusoidal signal generation circuit and power amplification circuit, the signal input end of described DDS sinusoidal signal generation circuit links to each other with the driving voltage control signal output ends of described single-chip microcomputer, and its signal output part connects the signal input part of described power amplification circuit; The signal output part of described power amplification circuit connects drive coil, makes drive coil produce stable alternating electromagnetic field in the space.
Described input contains two operational amplifiers with the conditioning unit, and its input end connects described two magnetic test coils respectively, and its output terminal connects described amplitude discriminating unit and described phase sensitive detection unit respectively.
Described amplitude discriminating unit contains subtracter, amplifier, totalizer and the rectification circuit of series connection successively, described input is connected two signal input parts of described subtracter with two signal output parts of conditioning unit, the voltage signal of described exciting unit output is adjusted another input end that circuit is imported described totalizer through one, and the output terminal of described rectifier connects the input end of analog signal of single-chip microcomputer; Stating and adjusting circuit is an operation amplifier circuit.
Described phase sensitive detection unit contains phase inverter, phase-sensitive detector (PSD), subtracter and the amplifier of series connection successively, a described input and a signal input inverter nursing one's health unit output, another signal is imported described phase-sensitive detector (PSD), another input end input reference voltage of subtracter, the output terminal of described amplifier connects the input end of analog signal of described single-chip microcomputer.
Evidence: method and system proposed by the invention can be implemented in the detection of carrying out the ball situation outside the bulb road, have reached its intended purposes.
Description of drawings:
Fig. 1 fitted outside detection system principle of work block diagram;
Fig. 2 sensor construction synoptic diagram; 1 pipeline, 2 skeletons, 3 coils, 3-1 magnetic test coil 1,3-2 drive coil, 3-3 magnetic test coil 2,4 supports
Fig. 3 exciting unit circuit theory diagrams;
Fig. 4 detects and conditioning element circuit schematic diagram;
Fig. 5 amplitude detection unit circuit theory diagrams;
U when Fig. 6 has ball and no ball to pass through
OAOscillogram; The no ball of Fig. 6 (a) by the time waveform, 6 (b) ball forward by the time waveform, 6 (c) ball oppositely by the time waveform
Fig. 7 phase sensitive detection element circuit theory diagram;
The basic composition block diagram of Fig. 8 Single Chip Microcomputer (SCM) system;
Fig. 9 crosses the ball signal and judges principle schematic; Fig. 9 (a) range signal, Fig. 9 (b) phase signal, Fig. 9 (c) folk prescription be to undesired signal, Fig. 9 (d) twocouese undesired signal
Figure 10 crosses ball determining program FB(flow block).
Embodiment:
Below in conjunction with description of drawings the specific embodiment of the present invention.
Principle of the present invention is: the electromagnetic field that can produce alternation by the coil of exchange current in its vicinity, can produce eddy current near electric conductor coil (graphite nodule), the eddy current that is produced can influence external electromagnetic field again conversely, thereby influence the amplitude and the phase place of coil voltage, the variation of amplitude and phase place by magnetic test coil voltage can be judged to have or not the graphite nodule of conduction to pass through.
The principle of work of ball detection system excessively of the present invention as shown in Figure 1.The Single-chip Controlling exciting unit produces the fixed ampllitude simple alternating current pumping signal U of 1K one 8K
E, the drive coil that acts on sensor produces stable alternating electromagnetic field in the space.Because the mutual inductance effect can induce with sinusoidal voltage U frequently with arranging on all symmetrical magnetic test coil two parameters
R1, U
R2, these two induced signals no ball by the time be the homophase constant-amplitude signal, have ball by the time variation of amplitude and phase place can appear.The induced signal of magnetic test coil through input and conditioning unit after, carry out phase sensitive detection and amplitude and differentiate, phase-detecting and inspection width of cloth output signal are sent into the A/D passage of single-chip microcomputer, through determining to have or not ball after the data analysis and crossing direction of bowl.
Below with reference to each unit among Fig. 1 technical scheme of the present invention and technical characterictic are described.
1 sensor
The structure of sensor as shown in Figure 2.The mode that sensor adopts excitation to separate with magnetic test coil.The drive coil width is bigger, so that form stable magnetic field in the space, guarantees all even stable of magnetic field, magnetic test coil place; The magnetic test coil shape is narrow flat, can guarantee the sensitivity that detects, and the winding method of two magnetic test coils, material therefor and coil turn is identical, with the resistance that guarantees them and inductance error less than 1%.Sensor also can only comprise two coils, and these two coils encourage and magnetic test coil each other; Sensor also can be designed to two semicircles to dress, also can turn to V-type; Effect structure shown in Figure 2 is better.
2 exciting units
The basic circuit principle of exciting unit as shown in Figure 3.Exciting unit comprises two parts: DDS sinusoidal signal generation circuit and power amplification circuit.
DDS (Direct Digital Synthesis) is the Direct Digital frequency synthesis, it is a kind of new frequency combining method, it has frequency stability height, frequency resolution height, frequency switches fast, advantage such as phase place is controlled, and the present invention has adopted AD9850 DDS control chip (U7).By selecting suitable frequency of operation, can make the ball pick-up unit avoid the interfering frequency of on-the-spot the most frequent appearance, help to improve the antijamming capability of system.
The power amplification circuit is fairly simple, and the present invention has adopted LM1875 power amplifier module (A3A).LM1875 is that a kind of audio power amplifies chip, and its peak power output is 30W, and bandwidth of operation can reach 70K, is very suitable for the functional requirement of apparatus of the present invention.
3 detect and the conditioning unit
The function that detects and nurse one's health the unit is: the sine wave signal to two magnetic test coils outputs amplifies and Phase Processing, it is in is fit to the voltage range that subsequent conditioning circuit is handled, and when no fuel sphere passes through, guarantee this two signal homophase constant amplitudes.Detect with the modulate circuit ultimate principle as shown in Figure 4, U
R2Treatment circuit and U
R1Identical, adopt amplifier TL084, can adjust enlargement factor by adjusting potentiometer VR1, by adjusting L1 and C1, phase place that can control waveform.
4 amplitude discriminating unit
The major function of amplitude discriminating unit is: detected U when having or not ball to pass through in the bulb road
1And U
2The variation of signal amplitude, its ultimate principle as shown in Figure 5.U among the figure
EIdentical with pumping signal, Ur be with no ball by the time U
1And U
2With the reference signal of frequency homophase, it is identical with Fig. 4 principle to adjust circuit.When no ball passes through, U
1And U
2With frequency, homophase, constant amplitude, be zero after subtracting each other, at this moment, the output U of rectification circuit
OARectification output for Ur.As ball by the time because the induction reactance of the effect magnetic test coil of eddy current can change, and because the asynchronism(-nization) of fuel sphere by magnetic test coil 1 and magnetic test coil 2, so U
1And U
2Amplitude and phase place rectification this moment output signal U can appear changing
OAVariation on the amplitude can appear, U
OAWaveform as shown in Figure 6.
5 phase sensitive detection unit
Because sensor, cable and detection system are easy to be subjected to electromagnetic interference (EMI), and these interference are many with voltage disturbance, only judge by amplitude detection unit to have or not ball to have certain unreliability, so the present invention have designed the phase sensitive detection unit.Its major function is the variation of signal phase when detecting the bulb road and having or not ball to pass through, its ultimate principle as shown in Figure 7, V among the figure
CCBe supply voltage.The fundamental purpose of phase sensitive detection is with U
1And U
2Phase differential be converted to proportional with it voltage signal.The AD9901 phase frequency detector that phase-sensitive detector (PSD) can adopt ADI company to produce is typical case's output of 1.8V for amplitude, and its transfer function can be expressed as 0.286V/rad.When no ball passes through, U
1And U
2With frequency, homophase, U
1Anti-phase back and U
2Phase differential be π, this moment phase-sensitive detector (PSD) output be about 0.9V.As ball by the time because the induction reactance of the effect magnetic test coil of eddy current can change, and because the asynchronism(-nization) of fuel sphere by magnetic test coil 1 and magnetic test coil 2, so U
1And U
2Phase place can occur changing, the output of phase-sensitive detector (PSD) will change about 0.9V this moment, but this variation is extremely small, is difficult to direct detection.Therefore, the output with phase-sensitive detector (PSD) deducts a setting value, amplification output again, output voltage U
OPWaveform and waveform similarity shown in Figure 6.
6 Single Chip Microcomputer (SCM) system
Single Chip Microcomputer (SCM) system is an important component part of the present invention, mainly realizes the analyzing and processing of ball signal and the functions of use of pick-up unit, and its basic composition as shown in Figure 8.Single-chip microcomputer adopts the 80C196KB single-chip microcomputer of Intel Company.
The effect of each several part is as follows: EPROM is used for the permanent storage program; Power down protection RAM is used to store the nodule number certificate; Serial communication interface is used for program debug and data read; Perpetual calendar was used to the ball signal that reference and writing time are provided; LED is used for demonstration and added up nodule number; DDS is used to control the frequency of operation and the state of exciting unit, with the D of single-chip microcomputer
0-D
7, P
10-P
12(see figure 3) links to each other; Function key is used to realize some functions of use; Cross the ball pilot lamp whenever once by a fuel sphere flicker; Cross the ball pulse whenever by pulse signal of a fuel sphere output, be used for the control of other system.U
OAAnd U
OPFor the signal of amplitude detection unit and the output of phase sensitive detection unit, be the main foundation that ball is judged, insert the analog quantity input interface A/D of single-chip microcomputer
0And A/D
1
The major function of single chip part is to U
OAAnd U
OPSignal is analyzed, whether to determine ball.In order to improve antijamming capability, guaranteed the accuracy that the ball signal is judged, the present invention has adopted as Fig. 9-(a) and has crossed the ball determination methods shown in (b).
Set threshold value Uth1, the Uth2 of amplitude detection and threshold value Uth3, the Uth4 of phase-detection, carry out the judgement of following condition:
Condition (1)-amplitude threshold is judged: U
OAIn the Δ T time, cut twice respectively, to avoid folk prescription to the interference of undesired signal (Fig. 9-(c)) by Uth1 and Uth2.
Condition (2)-phase threshold is judged: U
OPIn the Δ T time, cut twice respectively, to avoid the interference of folk prescription to undesired signal by Uth3 and Uth4.
Condition (3)-amplitude wave-shape is judged: the shape of twocouese waveform has similarity, with the interference of avoiding the asymmetric undesired signal of twocouese (Fig. 9-(d)).Can be by interior to U at interval [t1, t4]
OACarry out integration, integrated value equals U
OANormality value (no ball by time magnitude of voltage) show that waveform has similarity.
Condition (4)-phase waveform is judged: the shape of twocouese waveform has similarity, to avoid the interference of the asymmetric undesired signal of twocouese.Can be by interior to U at interval [t5, t8]
OPCarry out integration, integrated value equals U
OPThe normality value show that waveform has similarity.
Definite method of threshold value Uth1 and Uth2 is as follows:
Uth1=(U
OANormality value+U when having ball to pass through
OAMaximal value)/2
Uth2=(U
OANormality value+U when having ball to pass through
OAMinimum value)/2
Uth3=(U
OPNormality value+U when having ball to pass through
OPMaximal value)/2;
Uth4=(U
OPNormality value+U when having ball to pass through
OPMinimum value)/2;
Definite method of threshold value Uth3 and Uth4 is identical with definite method principle of Uth1 and Uth2.
Δ T is the time interval that fuel sphere passes through two magnetic test coil centers, and is relevant with mistake ball speed with sphere diameter.
In the Δ T time, when condition (1) and (3) when satisfying, or condition (2) and (4) are when satisfying, and bar or part (1)～(4) can be judged as ball and pass through when satisfying simultaneously.As long as there is ball to pass through, then condition (1)～(4) all reset.The flow chart of crossing the ball judgment part as shown in figure 10.
If in ball bed high temperature gas cooled reactor fuel handling system, adopt detection system of the present invention, to have following useful effect in the prerequisite that guaranteed the ball detecting reliability: installation and maintenance need not to destroy the bulb road, guarantee the integrality and the high pressure impermeability of loading and unloading pipe material, reduce radiation pollution; Cell winding, skeleton and other annex directly contact with the radioactive fuel ball, and be lower to the radiation resistance requirement of whole detecting sensor material, the serviceable life that helps improving sensor.
Claims (11)
1, the pebble bed reactor fuel handling system is crossed the ball detection method, it is characterized in that, is to utilize the far-field eddy principle, with being installed in
Fitted outside detection system outside the bulb road detects the voltage of two magnetic test coils, and the voltage of these two magnetic test coils is advanced respectively
Row is examined the width of cloth and phase discrimination processing, obtains including the inspection width of cloth output voltage U of ball information
OAWith the phase demodulation output voltage U
OP, then
In single-chip microcomputer to this voltage U
OAAnd U
OPFurther analyze and handle, thereby judged whether ball is arranged in the bulb road
Process;
In described single-chip microcomputer, process is examined the amplitude detection voltage U of the width of cloth and phase discrimination processing
OAWith the phase-detection voltage U
OPAdvance
Row is analyzed and is handled, and judges whether ball, and its step is as follows:
1) initialization: given amplitude voltage detecting threshold value Uth1, Uth2;
Given phase voltage detection threshold Uth3, Uth4;
Given single is crossed the time range Δ T of ball signal Processing;
Given amplitude detection voltage U
OAThe normality value, promptly do not have ball by the time U
OAMagnitude of voltage;
Given phase-detection voltage U
OPThe normality value, promptly do not have ball by the time U
OPMagnitude of voltage;
2) gather the amplitude detection voltage U
OAWith the phase-detection voltage U
OP
3) carry out the judgement of following condition:
Condition (1) is carried out amplitude threshold and is judged: U
OAIn the Δ T time, whether cut respectively twice by Uth1 and Uth2;
Condition (2) is carried out phase threshold and is judged: U
OPIn the Δ T time, whether cut respectively twice by Uth3 and Uth4;
Condition (3), carry out amplitude wave-shape and judge: whether the shape of twocouese waveform has similarity;
Condition (4), carry out phase waveform and judge: whether the shape of twocouese waveform has similarity;
In the Δ T time, when satisfy simultaneously condition (1) and (3), or condition (2) and (4) satisfy simultaneously, or condition (1)～(4) have been judged as ball and have passed through when satisfying simultaneously, and condition (1)～(4) are all resetted, and continue judgement; Otherwise continue to judge.
2, pebble bed reactor fuel handling system as claimed in claim 1 is crossed the ball detection method, it is characterized in that, definite method of described threshold value Uth1, Uth2, Uth3, Uth4 is as follows:
Uth1=(U
OANormality value+U when having ball to pass through
OAMaximal value)/2;
Uth2=(U
OANormality value+U when having ball to pass through
OAMinimum value)/2;
Uth3=(U
OPNormality value+U when having ball to pass through
OPMaximal value)/2;
Uth4=(U
OPNormality value+U when having ball to pass through
OPMinimum value)/2.
3, the described pebble bed reactor fuel handling system of claim 1 is crossed the ball detection method, it is characterized in that, it's the time interval of the time range Δ T=fuel sphere of ball signal Processing by two magnetic test coil centers is past described single.
4, pebble bed reactor fuel handling system as claimed in claim 1 is crossed the ball detection method, it is characterized in that, the similarity of the shape of described twocouese waveform to amplitude wave-shape judges, be by in interval [t1, t4] to U
OACarry out integration, if integrated value equals U
OAThe normality value, show that then waveform has similarity; Described t1 is that Uth1 cuts U for the first time in the Δ T time
OATime, described t4 is that Uth2 cuts U for the second time in the Δ T time
OATime.
5, pebble bed reactor fuel handling system as claimed in claim 1 is crossed the ball detection method, it is characterized in that, the similarity of the shape of described twocouese waveform to phase waveform judges, be by in interval [t5, t8] to U
OPCarry out integration, if integrated value equals U
OPThe normality value, show that then waveform has similarity; Described t5 is that Uth3 cuts U for the first time in the Δ T time
OPTime, described t8 is that Uth4 cuts U for the second time in the Δ T time
OPTime.
6, the fitted outside detection system of crossing the ball detection method and designing according to claim 1 is characterized in that it contains:
Sensor: contain at least two coils that were coated on outside the bulb road, receive the pumping signal of exciting unit, produce stable alternating electromagnetic field in the space, and detect two voltage signals that reflected ball information, input signal detection and conditioning unit;
Exciting unit: receive the control signal of single-chip microcomputer, produce fixed ampllitude simple alternating current pumping signal, act on the drive coil of sensor, produce stable alternating electromagnetic field in the space;
Input and conditioning unit: the sine voltage signal of two magnetic test coil outputs of receiving sensor, amplify and Phase Processing, the signal after handling is outputed to amplitude discriminating unit and phase sensitive detection unit respectively;
The amplitude discriminating unit: received signal detects and two voltage signals of conditioning unit output, detects the changes in amplitude of these two signals, the voltage signal U of output-response changes in amplitude
OA
The phase sensitive detection unit: received signal detects and two voltage signals of conditioning unit output, detects the phase change of these two signals, the voltage signal U of output-response phase change
OP
Single-chip microcomputer: output a control signal to exciting unit, receive the signal of amplitude discriminating unit and phase sensitive detection unit output simultaneously, by analysis, determined whether the ball warp mistake.
7, fitted outside detection system as claimed in claim 6, it is characterized in that, described sensor is two magnetic test coils that were coated on coiled semicircle shape outside the bulb road, the adjacent bulb pipeline outer wall of crossing of described two magnetic test coils, and arrange along the length direction of crossing the bulb road, the winding method of these two magnetic test coils, material therefor and coil turn are identical; Also contain a drive coil, the width of this drive coil coiling is greater than described magnetic test coil.
8, fitted outside detection system as claimed in claim 6, it is characterized in that, described exciting unit contains DDS sinusoidal signal generation circuit and power amplification circuit, the signal input end of described DDS sinusoidal signal generation circuit links to each other with the driving voltage control signal output ends of described single-chip microcomputer, and its signal output part connects the signal input part of described power amplification circuit; The signal output part of described power amplification circuit connects drive coil, makes drive coil produce stable alternating electromagnetic field in the space.
9, fitted outside detection system as claimed in claim 6, it is characterized in that, described input contains two operational amplifiers with the conditioning unit, and its input end connects described two magnetic test coils respectively, and its output terminal connects described amplitude discriminating unit and described phase sensitive detection unit respectively.
10, fitted outside detection system as claimed in claim 6, it is characterized in that, described amplitude discriminating unit contains subtracter, amplifier, totalizer and the rectification circuit of series connection successively, described input is connected two signal input parts of described subtracter with two signal output parts of conditioning unit, the voltage signal of described exciting unit output is adjusted another input end that circuit is imported described totalizer through one, and the output terminal of described rectifier connects the input end of analog signal of single-chip microcomputer; Stating and adjusting circuit is an operation amplifier circuit.
11, detection system as claimed in claim 6, it is characterized in that, described phase sensitive detection unit contains phase inverter, phase-sensitive detector (PSD), subtracter and the amplifier of series connection successively, a described input and a signal input inverter nursing one's health unit output, another signal is imported described phase-sensitive detector (PSD), another input end input reference voltage of subtracter, the output terminal of described amplifier connects the input end of analog signal of described single-chip microcomputer.
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| CNB2005101363094A CN100483560C (en) | 2005-12-31 | 2005-12-31 | Overball inspection and external inspecting system for loading-unloading system of ball-bed piled fuel component |
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| FR2907223B1 (en) * | 2006-10-13 | 2009-04-03 | Areva Np Sas | METHOD AND DEVICE FOR DETECTING STRUCTURAL ANOMALIES IN A SPHERICAL PARTICLE, IN PARTICULAR IN A NUCLEAR FUEL PARTICLE FOR REACTORS AT HIGH TEMPERATURE OR VERY HIGH TEMPERATURE. |
| CN101202126B (en) * | 2007-12-10 | 2011-12-28 | 清华大学 | Bidirectional ball-passing count and display device for ball bed high temperature gas-cooling stack ball-passing loading/unloading system |
| CN103247359A (en) * | 2013-04-23 | 2013-08-14 | 中国核动力研究设计院 | Online sipping detection system for integrity detection for fuel element cladding in nuclear power plant |
| 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 |
| CN105448360B (en) * | 2015-12-22 | 2018-05-25 | 清华大学 | Nearly isometrical ball flow tube based on vibration signal processing passes by ball detecting system and method |
| CN109785983B (en) * | 2019-01-30 | 2020-10-16 | 清华大学 | Method and system for detecting one-way ball passing signal |
| CN111724922B (en) * | 2020-06-24 | 2022-04-08 | 西南科技大学 | High-temperature gas cooled reactor fuel conveying pipeline maintenance device, system and method |
| CN113482924B (en) * | 2021-08-03 | 2022-07-05 | 华能山东石岛湾核电有限公司 | Method and system for determining working frequency of fan based on spent fuel conveying system |
| CN115083636B (en) * | 2022-06-22 | 2023-11-03 | 华能核能技术研究院有限公司 | High-temperature gas cooled reactor ball passing counter measuring method and device |
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