WO2023037664A1 - スケール厚さの計測方法 - Google Patents
スケール厚さの計測方法 Download PDFInfo
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- WO2023037664A1 WO2023037664A1 PCT/JP2022/020802 JP2022020802W WO2023037664A1 WO 2023037664 A1 WO2023037664 A1 WO 2023037664A1 JP 2022020802 W JP2022020802 W JP 2022020802W WO 2023037664 A1 WO2023037664 A1 WO 2023037664A1
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- WIPO (PCT)
- Prior art keywords
- scale
- eddy current
- thickness
- heat transfer
- magnetic field
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000523 sample Substances 0.000 claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000012546 transfer Methods 0.000 claims abstract description 35
- 230000005284 excitation Effects 0.000 claims abstract description 23
- 238000011088 calibration curve Methods 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 238000000691 measurement method Methods 0.000 description 7
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/904—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
- G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating
-
- 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
Definitions
- Patent Document 1 discloses a technique for measuring the thickness of a scale using a probe that generates eddy currents.
- the coil is excited while the probe is inserted and moved through the heat transfer tube.
- a magnetic field is then generated in the scale, which in turn induces an induced voltage in the coil of the sensor. Since the impedance of the coil at that time is a function of the thickness of the scale, it is said that the thickness of the scale can be obtained by measuring the impedance. That is, this technique uses a self-induced standard comparison scheme.
- the self-inductive standard comparison type probe as described above is vulnerable to bending, rattling, and temperature changes, and there was a problem that it was difficult to accurately measure the scale thickness.
- the present disclosure has been made to solve the above problems, and aims to provide a scale thickness measurement method that enables more accurate measurement.
- a method for measuring scale thickness measures the thickness of scale adhered to the outer peripheral surface of a heat transfer tube that extends in the axial direction and has a cylindrical shape centered on the axis.
- a scale thickness measurement method using a current probe wherein the eddy current probe includes an excitation coil that generates an eddy current, and is provided integrally with the excitation coil, and detects an axial component of a magnetic field based on the eddy current, and a pair of detection coils for detecting a circumferential component, and the method for measuring the thickness of the scale comprises detecting the magnetic field detected by the pair of detection coils in a region of the heat transfer tube where the scale is not adhered.
- obtaining a reference point by calculating the difference between the axial component and the circumferential component; inserting the eddy current probe into the heat transfer tube and moving it in the axial direction; calculating a difference between the axial component and the circumferential component of the magnetic field detected by the coil; determining a drift amount by comparing the difference with the reference point; and based on the drift amount, and calculating the scale thickness from a pre-obtained calibration curve.
- FIG. 1 is a schematic diagram showing the configuration of an eddy current probe according to an embodiment of the present disclosure
- FIG. FIG. 4 is a view showing the configuration of an excitation coil and a detection coil included in the eddy current probe according to the embodiment of the present disclosure, viewed from the inside in the radial direction of the heat transfer tube
- FIG. 4 is a diagram showing the configuration of an excitation coil and a detection coil included in the eddy current probe according to the embodiment of the present disclosure, viewed from the axial direction of the heat transfer tube
- FIG. 4 is a process chart showing a method for measuring scale thickness according to an embodiment of the present disclosure
- It is an example of a calibration curve showing the relationship between the thickness of the scale and the drift amount of the magnetic field due to the scale.
- FIG. 1 An eddy current probe 1 according to an embodiment of the present disclosure and a method for measuring scale thickness using the same will be described below with reference to FIGS. 1 to 5.
- FIG. 1 An eddy current probe 1 according to an embodiment of the present disclosure and a method for measuring scale thickness using the same will be described below with reference to FIGS. 1 to 5.
- FIG. 1 An eddy current probe 1 according to an embodiment of the present disclosure and a method for measuring scale thickness using the same will be described below with reference to FIGS. 1 to 5.
- FIG. 1 The configuration of the eddy current probe 1 will be described with reference to FIGS. 1 to 3.
- FIG. 1 the eddy current probe 1 is used by being inserted inside a heat transfer tube 90 .
- a plurality of heat transfer tubes 90 are provided inside the steam generator, for example.
- the heat transfer tube 90 extends along the axis O and has a cylindrical shape with the axis O as the center. Deposits called scales are generated on the outer peripheral surface of the heat transfer tube 90 as the heat transfer tube 90 is operated over time.
- An eddy current probe 1 is used to measure the thickness of this scale.
- the eddy current probe 1 includes a probe body 10 and a plurality of coil assemblies 11. Various wirings are housed inside the probe body 10 .
- the probe body 10 has a cylindrical shape extending along the axis O. As shown in FIG. A plurality of coil assemblies 11 are provided at intervals in the circumferential direction of the axis O at the tip of the probe body 10 .
- the coil assembly 11 has one excitation coil 11a and a pair of detection coils 11b.
- the excitation coil 11a is ring-shaped.
- the exciting coil 11 a is arranged inside the probe body 10 so that its diameter direction is perpendicular to the inner peripheral surface of the heat transfer tube 90 .
- the exciting coil 11a is arranged in a posture inclined by about 45° with respect to the axis O. As shown in FIG.
- the excitation coil 11a is excited by a voltage supplied from the outside to generate an eddy current near the inner peripheral surface of the heat transfer tube 90 .
- the detection coil 11b is integrally provided on the outer peripheral side (that is, on the heat transfer tube 90 side) of the excitation coil 11a.
- Each detection coil 11 b has, for example, a rectangular annular shape and spreads along the inner peripheral surface of the heat transfer tube 90 .
- the detection coil 11b is arranged in a posture inclined by about 45° with respect to the axis O, and a pair of detection coils 11b are provided with an interval in the inclined direction.
- Each detection coil 11b is used to capture changes in the magnetic field based on the eddy current generated by the excitation coil 11a. For example, changes in the circumferential magnetic field and the axial magnetic field are detected from the detected voltage difference between the detection coil 11b on one side and the detection coil 11b on the other side.
- this measurement method includes a reference point determination step S1, a probe movement step S2, a difference calculation step S3, a drift amount calculation step S4, and a scale thickness calculation step S5.
- the magnetic field detected by the pair of detection coils 11b is measured on a sample (calibration test piece) having the same material and dimensions as the heat transfer tube 90, or a scale-free region of the heat transfer tube 90. measure. Specifically, the difference between the component in the direction of the axis O of the magnetic field and the component in the circumferential direction is calculated, and the point at which the difference is zero is set as the reference point. That is, the reference point determination step S1 is performed to correct the detection result of the eddy current probe 1 without scale.
- the probe movement step S2 is executed.
- the eddy current probe 1 is inserted inside the heat transfer tube 90 and moved in the axis O direction. At this time, an eddy current is generated in the vicinity of the inner peripheral surface of the heat transfer tube 90 by the excitation coil 11a.
- the scale attached to the outer peripheral surface of the heat transfer tube 90 causes a change in the magnetic field detected by the detection coil 11b.
- the difference between the axis O direction component and the circumferential direction component of the magnetic field detected by the pair of detection coils 11b is calculated.
- the value of this difference shifts (drifts) from the reference point.
- the drift amount calculation step S4 the amount of change (drift amount) from this reference point is calculated.
- the scale thickness calculation step S5 is executed.
- the scale thickness is calculated by collating the above-described drift amount with a pre-obtained calibration curve. As an example is shown in FIG. 5, the drift amount and the scale thickness are in a proportional relationship. In other words, as the amount of drift increases, the thickness of the scale tends to increase as well.
- the scale thickness is obtained based on this calibration curve. All steps of the method for measuring the thickness of the scale are thus completed.
- the eddy current probe 1 according to the present embodiment and the method for measuring the thickness of the scale have the configurations as described above. According to the above configuration and method, the difference between the axis O direction component and the circumferential direction component of the magnetic field detected by the pair of detection coils 11b is calculated, and the drift amount is obtained by comparing this difference with the reference point. Furthermore, based on the amount of drift, the thickness of the scale is calculated from a pre-acquired calibration curve. Since the so-called differential method is used in this manner, the scale thickness can be accurately measured in a robust state against disturbances such as bending and stretching of the probe. As a result, it becomes possible to evaluate the scale thickness more precisely and accurately.
- the excitation coil 11a and the pair of detection coils 11b are arranged in a direction inclined with respect to the axis O, eddy currents are generated in a wider range in the direction of the axis O and in the circumferential direction. It is possible to generate the eddy current and stably detect the change in the magnetic field based on the eddy current in a wider range.
- a plurality of coil assemblies 11 are arranged at intervals in the circumferential direction.
- the scale thickness can be stably and accurately measured over the entire circumference of the heat transfer tube 90 .
- the detection coil 11b is provided on the outer peripheral side of the excitation coil 11a.
- the detection coil 11b is arranged so as to surround the excitation coil 11a.
- a pair of coils for excitation and detection are provided and arranged along the direction of the axis O and the circumferential direction.
- the thickness of the scale adhering to the outer peripheral surface of the heat transfer tube 90 which extends in the direction of the axis O and has a cylindrical shape centered on the axis O is measured.
- the difference between the component in the direction of the axis O and the component in the circumferential direction of the magnetic field detected by the pair of detection coils 11b is calculated, and the amount of drift is obtained by comparing this difference with the reference point. Furthermore, based on the amount of drift, the thickness of the scale is calculated from a pre-acquired calibration curve. Since the so-called differential method is used in this manner, the scale thickness can be accurately measured in a robust state against disturbances such as bending and stretching of the probe.
- the excitation coil 11a and the pair of detection coils 11b are inclined with respect to the axis O in the scale thickness measurement method according to the first aspect. may be arranged in the direction
- the excitation coil 11a and the pair of detection coils 11b are arranged in a direction inclined with respect to the axis O, eddy currents are generated in a wider range in the direction of the axis O and in the circumferential direction. In addition, it is possible to stably detect changes in the magnetic field based on this eddy current over a wider range.
- the excitation coil 11a and the pair of detection coils 11b are configured as eddy current probes. A plurality of them may be arranged at intervals in the circumferential direction of one.
- the scale thickness can be stably and accurately measured over the entire circumferential direction of the heat transfer tube 90 .
- the present disclosure relates to a method for measuring the thickness of scale adhering inside heat transfer tubes included in a steam generator of a nuclear power plant. According to the method of the present disclosure, the thickness of the scale can be accurately measured.
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- General Physics & Mathematics (AREA)
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- Electrochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Description
図1から図3を参照して、渦電流プローブ1の構成について説明する。図1に示すように、渦電流プローブ1は、伝熱管90の内部に挿入されて使用される。伝熱管90は、例えば蒸気発生器の内部に複数設けられている。伝熱管90は、軸線Oに沿って延びるとともに、当該軸線Oを中心とする円筒状をなしている。伝熱管90の外周面には、経年運用に伴ってスケールと呼ばれる付着物が発生する。渦電流プローブ1は、このスケールの厚さを計測するために用いられる。
次いで、上記の渦電流プローブ1を用いたスケール厚さの計測方法について説明する。図4に示すように、この計測方法は、基準点決定ステップS1と、プローブ移動ステップS2と、差分算出ステップS3と、ドリフト量算出ステップS4と、スケール厚さ算出ステップS5と、を含む。
スケール厚さを計測するに当たって、従来は自己誘導標準比較方式と呼ばれる方式のプローブが用いられることが一般的であった。この方式では、一方のコイルを試験体に,他方のコイルを基準体に作用させて差異を検出する。試験体における減肉量などの絶対量を検出する必要がある場合に用いられるものである。しかし,リフトオフ雑音の影響が大きいため、正確な計測を行うことが難しいという課題があった。
以上、本開示の実施の形態について図面を参照して詳述したが、具体的な構成はこの実施の形態に限られるものではなく、本開示の要旨を逸脱しない範囲の設計変更等も含まれる。例えば、上記実施形態では、コイル組立体11が軸線Oに対して45°傾斜している構成について説明した。しかしながら、コイル組立体11の姿勢はこれに限定されず、軸線Oに対してわずかでも傾斜していれば、その傾斜角度は45°未満であってもよい。
各実施形態に記載のスケール厚さの計測方法は、例えば以下のように把握される。
1 渦電流プローブ
10 プローブ本体
11 コイル組立体
11a 励磁コイル
11b 検出コイル
O 軸線
Claims (3)
- 軸線方向に延びるとともに、該軸線を中心とする円筒状をなす伝熱管の外周面に付着したスケールの厚さを渦電流プローブによって計測するスケール厚さの計測方法であって、 前記渦電流プローブは、
渦電流を発生させる励磁コイルと、
該励磁コイルと一体に設けられ、前記渦電流に基づく磁場の軸線方向成分、及び周方向成分を検出する一対の検出コイルと、
を備え、
前記スケール厚さの計測方法は、
前記伝熱管における前記スケールが付着していない領域で、前記一対の検出コイルが検出した前記磁場の前記軸線方向成分と前記周方向成分の差分を算出することで基準点を求めるステップと、
前記渦電流プローブを前記伝熱管の内部に挿入し、前記軸線方向に移動させるステップと、
前記一対の検出コイルが検出した前記磁場の前記軸線方向成分と前記周方向成分の差分を算出するステップと、
前記差分と前記基準点とを比較することでドリフト量を求めるステップと、
該ドリフト量に基づいて、予め取得された校正曲線から前記スケールの厚さを算出するステップと、
を含むスケール厚さの計測方法。 - 前記励磁コイル、及び前記一対の検出コイルは、前記軸線に対して傾斜した方向に配置されている請求項1に記載のスケール厚さの計測方法。
- 前記励磁コイル、及び前記一対の検出コイルが、前記渦電流プローブの周方向に間隔をあけて複数配列されている請求項1又は2に記載のスケール厚さの計測方法。
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EP22866994.1A EP4336137A1 (en) | 2021-09-08 | 2022-05-19 | Scale thickness measuring method |
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JP2021-146218 | 2021-09-08 | ||
JP2021146218A JP2023039183A (ja) | 2021-09-08 | 2021-09-08 | スケール厚さの計測方法 |
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63298052A (ja) * | 1987-02-19 | 1988-12-05 | アトミック エナジー オブ カナダ リミテツド | 渦電流プローブ |
JPH0587510A (ja) | 1991-09-26 | 1993-04-06 | Mitsubishi Heavy Ind Ltd | スケール厚さ測定方法 |
US20090206830A1 (en) * | 2008-02-19 | 2009-08-20 | Young Joo Kim | Sensor for detecting surface defects of metal tube using eddy current method |
JP2012002633A (ja) * | 2010-06-16 | 2012-01-05 | Hitachi Ltd | 渦電流検査装置および検査方法 |
JP2012141271A (ja) * | 2011-01-06 | 2012-07-26 | Mitsubishi Heavy Ind Ltd | 付着物計測装置及び付着物計測方法並びに付着物計測プログラム |
JP2019215282A (ja) * | 2018-06-13 | 2019-12-19 | 東亜非破壊検査株式会社 | 管状体のきず又は欠陥の検査方法及び装置 |
JP2020143958A (ja) * | 2019-03-05 | 2020-09-10 | 株式会社テイエルブイ | プローブ及び厚さ測定装置 |
JP2021146218A (ja) | 2020-03-18 | 2021-09-27 | グローバス メディカル インコーポレイティッド | ニューロナビゲーション位置合わせおよびロボット軌道誘導のためのシステム、ならびに関連する方法およびデバイス |
-
2021
- 2021-09-08 JP JP2021146218A patent/JP2023039183A/ja active Pending
-
2022
- 2022-05-19 EP EP22866994.1A patent/EP4336137A1/en active Pending
- 2022-05-19 WO PCT/JP2022/020802 patent/WO2023037664A1/ja active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63298052A (ja) * | 1987-02-19 | 1988-12-05 | アトミック エナジー オブ カナダ リミテツド | 渦電流プローブ |
JPH0587510A (ja) | 1991-09-26 | 1993-04-06 | Mitsubishi Heavy Ind Ltd | スケール厚さ測定方法 |
US20090206830A1 (en) * | 2008-02-19 | 2009-08-20 | Young Joo Kim | Sensor for detecting surface defects of metal tube using eddy current method |
JP2012002633A (ja) * | 2010-06-16 | 2012-01-05 | Hitachi Ltd | 渦電流検査装置および検査方法 |
JP2012141271A (ja) * | 2011-01-06 | 2012-07-26 | Mitsubishi Heavy Ind Ltd | 付着物計測装置及び付着物計測方法並びに付着物計測プログラム |
JP2019215282A (ja) * | 2018-06-13 | 2019-12-19 | 東亜非破壊検査株式会社 | 管状体のきず又は欠陥の検査方法及び装置 |
JP2020143958A (ja) * | 2019-03-05 | 2020-09-10 | 株式会社テイエルブイ | プローブ及び厚さ測定装置 |
JP2021146218A (ja) | 2020-03-18 | 2021-09-27 | グローバス メディカル インコーポレイティッド | ニューロナビゲーション位置合わせおよびロボット軌道誘導のためのシステム、ならびに関連する方法およびデバイス |
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