CN202947698U - Device for measuring thicknesses of metal layer and oxide layer of boiler heating surface tube wall - Google Patents
Device for measuring thicknesses of metal layer and oxide layer of boiler heating surface tube wall Download PDFInfo
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- CN202947698U CN202947698U CN 201220612023 CN201220612023U CN202947698U CN 202947698 U CN202947698 U CN 202947698U CN 201220612023 CN201220612023 CN 201220612023 CN 201220612023 U CN201220612023 U CN 201220612023U CN 202947698 U CN202947698 U CN 202947698U
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- ultrasonic pulse
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- 239000002184 metal Substances 0.000 title claims abstract description 34
- 238000010438 heat treatment Methods 0.000 title claims abstract description 23
- 239000000523 sample Substances 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000284 extract Substances 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 description 14
- 230000003647 oxidation Effects 0.000 description 11
- 238000002604 ultrasonography Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 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
- 238000006263 metalation reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
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- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The utility model relates to a device for measuring thicknesses of a metal layer and an oxide layer of a boiler heating surface tube wall. The device is composed of a high-frequency ultrasonic pulse generating/receiving unit, a broadband oscilloscope and a high-frequency transverse wave normal probe, wherein the high-frequency ultrasonic pulse generating/receiving unit is in circuit connection with the broadband oscilloscope and the high-frequency transverse wave normal probe respectively. The high-frequency transverse wave normal probe motivates and receives ultrasonic waves spread in workpieces when detecting the workpieces. The high-frequency ultrasonic pulse generating/receiving unit is in charge of motivating the probe to generate high-frequency narrow-pulse transverse wave ultrasonic signals and receiving feedback signals of the probe simultaneously. The broadband oscilloscope displays the ultrasonic signals, distinguishes reflected signals of an oxide/metal matrix interface and extracts time intervals between different reflected waves. By means of the device, the reflected signals of the oxide/metal matrix interface are distinguished clearly, thicknesses of the metal layer and the oxide layer of the boiler heating surface tube wall are measured accurately, the detection accuracy is high, the operation is simple and convenient, and accurate data are provided for production operation and maintenance of equipment.
Description
Technical field
The utility model belongs to UT (Ultrasonic Testing) detection technique field, relates to the measurement mechanism of a kind of heating surface tubes in boilers tube metal and oxidated layer thickness.
Technical background
Heating surface tubes in boilers is made of three layers, outer wall oxidation and corrosion scales, metal thickness layer and inner wall oxide thing layer.When the conventional ultrasound measuring thickness device detects the thickness of tube wall, can't measure respectively oxidated layer thickness and metal pipe-wall thickness, its one-tenth-value thickness 1/10 that records is metal layer thickness and oxidated layer thickness sum.Adopt conventional ultrasound surveying instrument (as A-mode ultrasonic wave inspection instrument) when the boiler heating surface tube wall is carried out thickness measuring, engage in tight situation with oxidation layer on inner wall at the tube wall metal, when the ultrasonic acoustic beam that ultrasonic probe sends impinges perpendicularly on metal/inner wall oxide bed interface, because interface media of both sides acoustic impedance differs less, 96% acoustic wave transmission is arranged on the interface, only have 4% acoustic reflection.The echo of oxidation layer on inner wall/air interface is far above the echo at metal/oxide interface.Metal/oxidation layer on inner wall interface echo is low, and common thicknessmeter can not the receiving circuit signal, and thicknessmeter can only detect oxide layer and air interface reflections signal.Therefore, the one-tenth-value thickness 1/10 that audiogage or common A-mode ultrasonic wave inspection instrument show is the thickness sum of metal level and oxidation corrosion layer, but not the remaining metal thickness of tube wall.The frequency span of conventional thicknessmeter is low, and pulse peak is wider, and only the low frequency narrow-band signal is carried out non-distortion excites and receive amplification to equipment, and resolving power is low, can not satisfy oxidated layer thickness and measure requirement.What equipment intensity was worked is metal layer thickness, and above-mentioned measured value can cause the gross error that strength accounting and life-span calculate, and affects the normal operation of boiler plant.
Summary of the invention
The purpose of this utility model is to provide the measurement mechanism of a kind of heating surface tubes in boilers tube metal and oxidated layer thickness, reflected signal with clear resolution oxide layer/basal body interface, accurately measure heating surface tubes in boilers tube metal and oxidated layer thickness, for production run and plant maintenance provide data accurately.
The device of the measurement of a kind of heating surface tubes in boilers tube metal of the utility model and oxidated layer thickness is comprised of high-frequency ultrasonic pulse generation/receiving element, wide band oscilloscope tube and high frequency normal shear wave probe.High-frequency ultrasonic pulse generation/receiving element is connected with high frequency normal shear wave probe circuit with wide band oscilloscope tube respectively.
The frequency span of high-frequency ultrasonic pulse generation/receiving element is 200MHZ.The frequency span of wide band oscilloscope tube is 200MHZ, and sampling rate is 1GS/S, time resolution ± 2ns.The centre frequency of high frequency normal shear wave probe is 20MHz, and half peak spectrum width is 12.6～31.1MHz.The high frequency normal shear wave probe is provided with little wafer and sound penetrating wedge.
The time excitation and be received in propagate ultrasound waves in workpiece for detection of workpiece of high frequency normal shear wave probe.High-frequency ultrasonic pulse generation/the receiving element of broadband high s/n ratio, high-gain is responsible for encouraging the high frequency normal shear wave probe, makes it to produce high frequency, burst pulse transversal wave ultrasonic ripple signal, simultaneously the feedback signal of receiving transducer.The wide band oscilloscope tube of high sampling rate is responsible for showing ultrasonic signal, tells the reflected signal at oxide layer/metallic matrix interface, and can extract the time interval between different reflection waves.
The measurement mechanism of the utility model heating surface tubes in boilers tube metal and oxidated layer thickness is by adopting high-frequency ultrasonic pulse generation/receiving element, guaranteed non-distortion that high-frequency signal gathers, high s/n ratio, high-gain and to the reception of faint oxide layer/basal body interface reflected signal.Select wide band oscilloscope tube, sampling rate is high, has guaranteed that the non-distortion of high frequency waveforms shows, time resolution reaches ± 2ns.Adopt the high frequency normal shear wave probe to improve the resolution of signal.The high frequency normal shear wave probe is furnished with little wafer and sound penetrating wedge, solves that pipe curvature is large, how much scatterings are large and avoids ultrasound wave near field region interference problem.The utility model can clearly be differentiated oxide layer/basal body interface reflected signal, accurately measure heating surface tubes in boilers tube metal and oxidated layer thickness, the synchronous detection, the detection degree of accuracy that realize heating surface tubes in boilers tube metal and oxidated layer thickness are high, simple to operation, for production run and plant maintenance provide data accurately.
Description of drawings
Fig. 1 is the schematic diagram of the utility model heating surface tubes in boilers tube metal and oxidated layer thickness measurement mechanism;
Fig. 2 is that ultrasound wave is propagated the sound path schematic diagram in tube wall;
Fig. 3 is ultrasound echo signal and the time interval schematic diagram thereof of oscilloscope display.
Wherein
1-high-frequency ultrasonic pulse generation/receiving element, 2-wide band oscilloscope tube, 3-high frequency normal shear wave probe, 4-heating surface tube, l1-sound penetrating wedge, l2-probe wafer, l3-metal level, l4-oxide layer, b11-oxidation layer on inner wall/metallic matrix interface primary reflection signal, b12-oxidation layer on inner wall/metallic matrix interface secondary counter ejected wave signal, B11-B11 is oxidation layer on inner wall/air interface primary reflection signal, B12-B12 is oxidation layer on inner wall/air interface secondary counter ejected wave signal, T1-probe/heating surface tube outer wall contact bed reflection wave signal.
Embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated.
The device of the measurement of the utility model heating surface tubes in boilers tube metal and oxidated layer thickness, as shown in Figure 1, be comprised of high-frequency ultrasonic pulse generation/receiving element 1, wide band oscilloscope tube 2 and high frequency normal shear wave probe 3, high-frequency ultrasonic pulse generation/receiving element is connected with high frequency normal shear wave probe circuit with wide band oscilloscope tube respectively.The frequency span of high-frequency ultrasonic pulse generation/receiving element 1 is 200MHZ.The frequency span of wide band oscilloscope tube 2 is 200MHZ, and sampling rate is 1GS/S, and time resolution is ± 2ns.High frequency normal shear wave probe 3 is provided with little wafer and sound penetrating wedge, and the centre frequency of high frequency normal shear wave probe is 20MHz, and half peak spectrum width is 12.6～31.1MHz.
The testing process of the utility model heating surface tubes in boilers tube metal and oxidated layer thickness measurement mechanism as shown in Figure 1, heating surface tube 4 surfaces of polishing tested, coat couplant, the ultrasonic probe coupling is placed on heating surface tube, adopt high-frequency ultrasonic pulse generation/receiving unit excitation high frequency normal shear wave probe 3, make it to produce ultrasound wave in workpiece, and receive simultaneously from the reflected signal of popping one's head in.Wide band oscilloscope tube 2 shows high-frequency ultrasonic pulse generation/receiving unit emission and the ultrasonic signal that receives.Ultrasound wave is propagated by path shown in Figure 2 in tube wall.Adjust time base ratio and the gain of system of Oscillograph, show each ultrasonic signal shown in Fig. 2, picked up signal as shown in Figure 3.Tube metal thickness S
1With inside pipe wall oxidation thickness S layer by layer
2Calculated by following formula (1) and formula (2).
S
1＝Ct·t
1/2 （1）
Wherein:
S
1: tube metal thickness;
Ct: the velocity of propagation of ultrasound wave in steel matrix;
t
1: the time interval of the secondary counter ejected wave equiphase point of oxidation layer on inner wall/air interface primary reflection and oxidation layer on inner wall/metal interface.
S
2＝Ct`·t
2/2 （2）
Wherein:
S
2: inside pipe wall oxidation thickness layer by layer;
Ct`: the velocity of propagation of ultrasound wave in oxide layer;
t
2: the time interval of the primary reflection equiphase point of-oxidation layer on inner wall/air interface primary reflection and oxide layer/metal interface.
Claims (3)
1. the measurement mechanism of a heating surface tubes in boilers tube metal and oxidated layer thickness, it is characterized in that: described device is comprised of high-frequency ultrasonic pulse generation/receiving element (1), wide band oscilloscope tube (2) and high frequency normal shear wave probe (3), and described high-frequency ultrasonic pulse generation/receiving element is connected with high frequency normal shear wave probe circuit with wide band oscilloscope tube respectively.
2. the measurement mechanism of heating surface tubes in boilers tube metal according to claim 1 and oxidated layer thickness, it is characterized in that: the frequency span of described high-frequency ultrasonic pulse generation/receiving element (1) is 200MHZ; The frequency span of described wide band oscilloscope tube (2) is 200MHZ, and sampling rate is 1GS/S, and time resolution is ± 2ns; The centre frequency of described high frequency normal shear wave probe (3) is 20MHz, and half peak spectrum width is 12.6～31.1MHz.
3. the measurement mechanism of heating surface tubes in boilers tube metal according to claim 1 and 2 and oxidated layer thickness, it is characterized in that: described high frequency normal shear wave probe (3) is provided with little wafer and sound penetrating wedge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220612023 CN202947698U (en) | 2012-11-19 | 2012-11-19 | Device for measuring thicknesses of metal layer and oxide layer of boiler heating surface tube wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220612023 CN202947698U (en) | 2012-11-19 | 2012-11-19 | Device for measuring thicknesses of metal layer and oxide layer of boiler heating surface tube wall |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202947698U true CN202947698U (en) | 2013-05-22 |
Family
ID=48423396
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220612023 Expired - Fee Related CN202947698U (en) | 2012-11-19 | 2012-11-19 | Device for measuring thicknesses of metal layer and oxide layer of boiler heating surface tube wall |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202947698U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913746A (en) * | 2015-06-05 | 2015-09-16 | 邯郸新兴特种管材有限公司 | Measuring method of metallurgically-bonded thermometal composite pipe wall thickness |
| CN105698012A (en) * | 2016-01-15 | 2016-06-22 | 北京工业大学 | Pipe flaw guided circumferential wave nondestructive testing method based on transverse-wave straight probes |
| CN106382899A (en) * | 2016-11-18 | 2017-02-08 | 上海市特种设备监督检验技术研究院 | Multifunctional integrated checking terminal device and checking method associated with pressure vessel and pressure pipeline |
| CN110389174A (en) * | 2018-04-17 | 2019-10-29 | 上海明华电力技术工程有限公司 | The method of electromagnetic acoustic detection Power Station Boiler Heating Surface inside pipe wall scale thickness |
-
2012
- 2012-11-19 CN CN 201220612023 patent/CN202947698U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913746A (en) * | 2015-06-05 | 2015-09-16 | 邯郸新兴特种管材有限公司 | Measuring method of metallurgically-bonded thermometal composite pipe wall thickness |
| CN105698012A (en) * | 2016-01-15 | 2016-06-22 | 北京工业大学 | Pipe flaw guided circumferential wave nondestructive testing method based on transverse-wave straight probes |
| CN106382899A (en) * | 2016-11-18 | 2017-02-08 | 上海市特种设备监督检验技术研究院 | Multifunctional integrated checking terminal device and checking method associated with pressure vessel and pressure pipeline |
| CN110389174A (en) * | 2018-04-17 | 2019-10-29 | 上海明华电力技术工程有限公司 | The method of electromagnetic acoustic detection Power Station Boiler Heating Surface inside pipe wall scale thickness |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130522 Termination date: 20161119 |