CN207248826U - Boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pit ultrasound detection Special test blocks - Google Patents
Boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pit ultrasound detection Special test blocks Download PDFInfo
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- CN207248826U CN207248826U CN201721222979.2U CN201721222979U CN207248826U CN 207248826 U CN207248826 U CN 207248826U CN 201721222979 U CN201721222979 U CN 201721222979U CN 207248826 U CN207248826 U CN 207248826U
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Abstract
A kind of boiler 12Cr1MoV low-temperature reheaters inside pipe wall etch pit ultrasound detection Special test block, test block material is 12Cr1MoV, specification is 57 × 4mm of Φ, 9 corrosion pit depths for making DAC curves are respectively 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, with respect to 180 ° arrangements of etch pit, shorten test block total length, and the minimum defect that the test block can simulate is the etch pit that depth is thickness of pipe wall 5%, ultrasound detection is carried out after instrument is adjusted and is verified using this test block, the defects of to boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pits, recall rate significantly improved, and the defects of to etch pit, positions and quantifies accurately, inspection result is true, reliably.
Description
Technical field
It the utility model is related to Low Temperature Reheater inside pipe wall etch pit ultrasonic detecting technology field, and in particular to a kind of
Boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pit ultrasound detection Special test blocks.
Background technology
In recent years, with the extension of Power Plant in China boiler operation time, 12Cr1MoV low-temperature reheater inside pipe walls
Occur many etch pits in succession.At present, the non-destructive testing technology of domestic and international inner wall corrosion hole defect mainly has low frequency electromagnetic detection
Technology and ultrasonic detecting technology.
Low frequency electromagnetic detection technique uses discrete excitation and receiving sensor, is excited under relatively low frequency (≤10Hz)
An alternating electromagnetic field is produced, and penetrates measured material, corresponding information treatment technology is worked out according to defect mechanism of production and is shown
Show means, so as to draw defect information.The factor for influencing low frequency electromagnetic detection data accuracy is main in actual mechanical process
Show as two kinds：One is clutter pollutes, the second is the detection speed of detection probe.Boiler exam is typically to borrow boiler maintenance machine
It can carry out, so inevitably detection work and other service works are carried out at the same time, and low frequency electromagnetic detection needs a peace and quiet
Environment but Overhaul site because maintenance need, certainly exist the electromechanical works such as sanding machine, it is also possible to have electric welding machine
In operation, sanding machine " piping " sound ear-piercing when working and the high strong electromagnetic of the electric welding machine work starting the arc and the generation in welding process
Ripple, which produces low frequency electromagnetic detection process, inevitably to be influenced.Site environment interference is too many, numerous interference signals and low frequency
Electromagnetic signal superposition causes measured signal distortion.Low frequency electromagnetic detection speed be to detection quality another big influence factor,
The detection speed requirement of low frequency electromagnetic detection probe is preferably maintained in uniform detection.In actually detected environment, bad environments are detected,
Pipe gathers, and etch pit is more to be occurred in low-temperature reheater pipe lower part, detects limited space；Detection pipe is more, area of detection is big,
In detection process manual operations is needed under existence conditions；The precision of low-frequency electronic detection is low, and tiny etch pit can not be carried out
Accurate detection, the minimum defect that can be detected is the etch pit that depth is thickness of pipe wall 30%.
In view of low frequency electromagnetic detection technique selects ultrasonic detecting technology to have detection sensitivity more there are above limitation
Height, quantify and position more accurately and reliably advantage.At this stage, the country there is no boiler 12Cr1MoV low-temperature reheaters inside pipe wall to corrode
Ultrasound detection Special test block is cheated, ultrasonic inspection can not be accurately carried out to boiler 12Cr1MoV low-temperature reheater inside pipe walls etch pit
Survey, therefore research and develop boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pit ultrasound detection Special test blocks, have important
Practical value and dissemination.
The content of the invention
In order to solve the above-mentioned problems of the prior art, the purpose of this utility model is to provide a kind of boiler
12Cr1MoV low-temperature reheater inside pipe wall etch pit ultrasound detection Special test blocks, are adjusted and verify to instrument using this test block
After carry out ultrasound detection, recall rate is high the defects of boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pits, and etch pit is lacked
Fall into positioning and quantify accurately, inspection result is true, reliable.
In order to achieve the above object, the utility model adopts the following technical solution：
A kind of boiler 12Cr1MoV low-temperature reheaters inside pipe wall etch pit ultrasound detection Special test block, the Special test block shape
Shape is hollow columnar with boiler 12Cr1MoV low-temperature reheaters pipe, thickness 4mm, is provided with it for make DAC curves 9
Etch pit, its depth are respectively 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm and 4mm, this 9 etch pits
It is made by semi-spherical bit, the minimum defect simulated is the etch pit that depth is thickness of pipe wall 5%；5 depth difference
It is respectively the etch pit of 0.5mm, 1.5mm, 2.5mm, 3.5mm for the etch pit of 0.2mm, 1mm, 2mm, 3mm, 4mm and 4 depth
Axially it is uniformly distributed in inner wall with respect to 180 °, shortens test block total length；9 etch pits from shallow to deep stagger two-by-two successively by longitudinal direction
25mm is arranged, avoids interfering with each other between etch pit when circumferential scanning adjustment and tester.
Material, the specification of the Special test block are identical with boiler 12Cr1MoV low-temperature reheater pipe material objects.
The acoustical behavior of the Special test block is identical with the acoustical behavior of boiler 12Cr1MoV low-temperature reheaters pipe material object.
The outside diameter of the Special test block is 57mm, total length 300mm.
Compared to the prior art compared with the utility model possesses following advantage：
1st, can be corroded using this test block with accurate alignment angle probe shear wave in boiler 12Cr1MoV low-temperature reheaters inside pipe wall
Cheat velocity of sound during ultrasound detection.
2nd, can be with the position of Accurate Determining boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pits using this test block.
3rd, can be with the depth of Accurate Determining boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pits using this test block.
4th, the defects of boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pits can be improved using this test block recall rate, and
And the positioning of defect and quantitative accurate.
Brief description of the drawings
Fig. 1 is a kind of boiler 12Cr1MoV low-temperature reheaters inside pipe wall etch pit ultrasound detection Special test block of the utility model
Front sectional view, unit is mm in figure.
Fig. 2 is a kind of boiler 12Cr1MoV low-temperature reheaters inside pipe wall etch pit ultrasound detection Special test block of the utility model
Left view sectional view, unit is mm in figure.
Embodiment
Below in conjunction with attached drawing and this Special test block of application to boiler 12Cr1MoV low-temperature reheater inside pipe walls etch pit ultrasound
The specific embodiment of instrument adjustment and verification before detection, is described in further detail the utility model.
As depicted in figs. 1 and 2, a kind of boiler 12Cr1MoV low-temperature reheaters inside pipe wall etch pit ultrasound inspection of the utility model
Special test block is surveyed, the Special test block shape is hollow columnar with boiler 12Cr1MoV low-temperature reheaters pipe, thickness 4mm, its
Inside be provided with 9 corrosion pit depths for making DAC curves be respectively 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm,
3mm, 3.5mm, 4mm, this 9 etch pits are made by semi-spherical bit, and the minimum defect simulated is that depth is tube wall
The etch pit of thickness 5%；5 depth be respectively the etch pit of 0.2mm, 1mm, 2mm, 3mm, 4mm and 4 depth be respectively 0.5mm,
The etch pit of 1.5mm, 2.5mm, 3.5mm are axially uniformly distributed with respect to 180 ° in inner wall, shorten test block total length, test block overall length
Spend for 300mm；Longitudinal 25mm that staggers two-by-two is arranged 9 etch pits successively from shallow to deep, avoids circumferential scanning adjustment and tester
Interfering with each other between etch pit during device.
During detection, first, using Special test block accurate alignment angle probe shear wave in boiler 12Cr1MoV low-temperature reheater pipes
Inner wall corrosion cheats refraction angle during ultrasound detection, it is known that the forward position of probe is A, and the probe 1 in Fig. 1 is placed in test block left end
Near, echo of maximum of end angle bottom surface is found out, at this moment 1 front end of measuring probe to test block left end distance is L, due to examination
Block thickness is 4mm, then pop one's head in refraction angle β=arctg [(L+A)/4], and refraction angle numerical value is inputted ultrasonic instrument parameter.Secondly,
By the probe 2 in Fig. 2 be circumferentially sequentially placed into depth be respectively 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm,
Respective highest back wave is found to make DAC curves in the etch pit outer wall oblique upper position of 3.5mm, 4mm, to determine that ultrasound is examined
The sensitivity of survey.Finally, ultrasound is carried out using the instrument and probe calibrated are in kind to boiler 12Cr1MoV low-temperature reheaters pipe
Detection, when the wave amplitude of etch pit is up to or over DAC curves, then can determine that the etch pit equivalent size reach or
More than the etch pit of Special test block simulation, and then the inner wall corrosion of discovery can be cheated and be accurately positioned and quantify.This test block application
Instrument adjustment and verification before boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pit ultrasound detections, utilize the Special test block
Carry out ultrasound detection it can be found that minimum defect be etch pit that depth is thickness of pipe wall 5%.
Claims (4)
- A kind of 1. boiler 12Cr1MoV low-temperature reheaters inside pipe wall etch pit ultrasound detection Special test block, it is characterised in that：It is described Special test block shape is hollow columnar with boiler 12Cr1MoV low-temperature reheaters pipe, thickness 4mm, is provided with for making in it 9 etch pits of DAC curves, its depth be respectively 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm and 4mm, this 9 etch pits are made by semi-spherical bit, and the minimum defect simulated is the corrosion that depth is thickness of pipe wall 5% Hole；5 depth be respectively the etch pit of 0.2mm, 1mm, 2mm, 3mm, 4mm and 4 depth be respectively 0.5mm, 1.5mm, The etch pit of 2.5mm, 3.5mm are axially evenly arranged with respect to 180 ° in inner wall, shorten test block total length；9 etch pit longitudinal directions The 25mm that staggers two-by-two is arranged, avoids interfering with each other between etch pit when circumferential scanning adjustment and tester.
- A kind of 2. special examination of boiler 12Cr1MoV low-temperature reheaters inside pipe wall etch pit ultrasound detection according to claim 1 Block, it is characterised in that：Material, the specification of the Special test block are identical with boiler 12Cr1MoV low-temperature reheater pipe material objects.
- A kind of 3. special examination of boiler 12Cr1MoV low-temperature reheaters inside pipe wall etch pit ultrasound detection according to claim 1 Block, it is characterised in that：The acoustical behavior of the Special test block and the acoustical behavior of boiler 12Cr1MoV low-temperature reheaters pipe material object It is identical.
- A kind of 4. special examination of boiler 12Cr1MoV low-temperature reheaters inside pipe wall etch pit ultrasound detection according to claim 1 Block, it is characterised in that：The outside diameter of the Special test block is 57mm, total length 300mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721222979.2U CN207248826U (en) | 2017-09-21 | 2017-09-21 | Boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pit ultrasound detection Special test blocks |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721222979.2U CN207248826U (en) | 2017-09-21 | 2017-09-21 | Boiler 12Cr1MoV low-temperature reheater inside pipe wall etch pit ultrasound detection Special test blocks |
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| Publication Number | Publication Date |
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| CN207248826U true CN207248826U (en) | 2018-04-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819835A (en) * | 2021-09-23 | 2021-12-21 | 广西壮族自治区特种设备检验研究院 | Furnace tube inner wall corrosion pit detection method |
-
2017
- 2017-09-21 CN CN201721222979.2U patent/CN207248826U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819835A (en) * | 2021-09-23 | 2021-12-21 | 广西壮族自治区特种设备检验研究院 | Furnace tube inner wall corrosion pit detection method |
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