CN104792876A - Nondestructive testing method for peel-off of oxidation layer on inner wall of boiler tube - Google Patents
Nondestructive testing method for peel-off of oxidation layer on inner wall of boiler tube Download PDFInfo
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- CN104792876A CN104792876A CN201510182261.4A CN201510182261A CN104792876A CN 104792876 A CN104792876 A CN 104792876A CN 201510182261 A CN201510182261 A CN 201510182261A CN 104792876 A CN104792876 A CN 104792876A
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Abstract
The invention discloses a nondestructive testing method for peel-off of an oxidation layer on the inner wall of a boiler tube. The method comprises the following steps: coating a polished point with a coupling agent, using a high frequency probe to be in contact with a to-be-detected point, catching an interface wave between the oxidation layer on the inner wall of the boiler tube and a metal layer, displaying the thickness transmission sonic path distance of an oxide skin on the inner wall of the boiler tube of the detected point by an oscilloscope, and after the testing, converting the measured sonic path distance by the oscilloscope into the thickness value of the oxide skin on the inner wall. If the measurement result differences of the thickness values of the oxide skin on the inner wall are larger when the probe is moved within a small range near the to-be-detected point, the oxidation layer of the point is indicated to be peeled off.
Description
Technical field
The invention belongs to Non-Destructive Testing diagnostic techniques field, relate to the lossless detection method that a kind of boiler tube oxidation layer on inner wall peels off.
Background technology
Heat power station unit runs for a long time in hot environment, high-temperature boiler pipe due to subject elevated pressures and running temperature within the scope of creep temperature, its damage principal mode be high-temerature creep.Along with the prolongation of working time, the inwall of pipe can produce the oxide layer of one deck densification, its composition mainly Fe
2o
3and Fe
3o
4, oxide layer adds the heat transfer resistance of metal pipe-wall, tube wall can not be made to obtain effective cooling, thus cause the rising of tube wall metal temperature, accelerate again the oxidizing process of tube wall metal.When pipe steam exit temperature is constant, the existence of oxide skin can cause pipe long-term overheat, causes a series of negative consequences such as oxidation aggravation, the rising of metal creep speed, failure and performance degradation, impels boiler tube premature failure.On the other hand, in blowing out and Starting-up process, the thermal stress that the change of temperature is brought out may cause scale spallation, the oxide skin of peeling off piles up bend part under the tube under gravity, result in blockage, reduce the steam flow in boiler tube, when blocking serious, also may cause Crack of Boiler Tube.
For the pipe explosion accident that control boiler tube causes because spalling of oxide layer piles up obstruction, lossless detection method conventional at present both at home and abroad has following several:
1) diagnostic by microwave method
Microwave frequency is than ultrasonic wave height, resolving power is high, but microwave can be totally reflected in metal surface, be suitable for nonmetallic materials infiltration thickness measuring, metal thickness measuring by mixing tee, identical two kinds of microwaves is reflected in the positive and negative both direction of tested metal simultaneously, the phase place difference finally detected, to determine specimen thickness, is not suitable for and detects boiler tube inner wall oxide skin thickness and peeling conditions from tube outer wall.
2) eddy detection technology
Eddy detection technology is widely used, it is a kind of method of detection of test tube sub-surface and near surface flaw, but go to measure inner wall oxide skin thickness with jacket-type or dot type probe, sensitivity cannot ensure, various undesired signal is difficult to analyze, and measures and peeling conditions so EDDY CURRENT is not suitable for boiler tube inner wall oxide skin thickness.
3) X ray, industry CT detection technique
Ray technology grows a lot in recent years, has developed with film making mode examination steel tube inner wall oxide skin thickness and peeling conditions, but when oxide skin is thinner, has been difficult to accurate measurement.In addition, instrument price is expensive, and inefficiency, x radiation x has infringement to human body, makes ray detection be subject to a definite limitation.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide the lossless detection method that a kind of boiler tube oxidation layer on inner wall peels off, the method can detect whether boiler tube oxidation layer on inner wall peels off, and safe and reliable, work efficiency is high accurately.
For achieving the above object, the lossless detection method that boiler tube oxidation layer on inner wall of the present invention peels off comprises the following steps:
1) the detection position of boiler tube to be measured is determined, and mark the detection position of boiler tube to be measured, polish on the surface of the detection position to boiler tube to be measured, eliminate the oxide scale layer of tested boiler tube outer wall, then give the detection position daubing coupling agent of boiler tube to be measured;
2) high frequency probe is contacted with any one check point of boiler tube to be measured;
3) high-frequency pulse voltage sent by impulse ejection instrument delivers to ultrasonic transducer, produce high-frequency ultrasonic, high-frequency ultrasonic is transmitted in the check point of boiler tube to be measured through the couplant on the entrant sound voussoir on high frequency probe and boiler tube surface to be measured, and be divided into two-way, wherein return through the internal surface reflection of boiler tube current detection point oxidation layer on inner wall to be measured in a road, return through the internal surface reflection of boiler tube current detection point metal level to be measured in another road, receiving end in high frequency probe receives the two-way high-frequency ultrasonic reflected, then the described two-way high-frequency ultrasonic reflected is forwarded in oscillograph,
4) obtained the mistiming between the two-way high-frequency ultrasonic that reflects by oscillograph, and calculate the thickness of boiler tube current detection point oxidation layer on inner wall to be measured according to the described mistiming;
5) mobile high frequency probe chooses next check point, repeats step 3) and 4) the thickness of the next check point oxidation layer on inner wall of boiler tube to be measured;
6) step 5 is repeated), obtain the thickness of all check point oxidation layer on inner walls on boiler tube, then judge whether the boiler tube oxidation layer on inner wall at each check point place peels off according to the thickness of check point oxidation layer on inner walls all on boiler tube to be measured.
Described high frequency ultrasound wave frequency is 15MHz.
Step 1) in polishing scope be 10mm × 20mm.
The present invention has following beneficial effect:
The lossless detection method that boiler tube oxidation layer on inner wall of the present invention peels off is in testing process, first produce high-frequency ultrasonic, described high-frequency ultrasonic to be put after the inside surface of oxidation layer on inner wall and metal level internal surface reflection through oscilloscope display out after testing, the mistiming of two high-frequency ultrasonics reflected is obtained again by oscillograph, the thickness of check point oxidation layer on inner wall is obtained according to the described mistiming, the precision measured is high, and work efficiency is high, injury can not be produced to human body, thus avoid the extensive Off of oxide skin fall blocking cause the boiler tube oxidation layer on inner wall of pipe explosion accident to peel off measuring method, effective monitoring oxide scale growth speed.
Embodiment
Being described in further detail the present invention below in conjunction with specific embodiment, is below explanation of the invention instead of restriction.
The lossless detection method that boiler tube oxidation layer on inner wall of the present invention peels off comprises the following steps:
1) the detection position of boiler tube to be measured is determined, and mark the detection position of boiler tube to be measured, polish on the surface of the detection position to boiler tube to be measured, eliminate the oxide scale layer of tested boiler tube outer wall, then give the detection position daubing coupling agent of boiler tube to be measured;
2) high frequency probe is contacted with any one check point of boiler tube to be measured;
3) high-frequency pulse voltage sent by impulse ejection instrument delivers to ultrasonic transducer, produce high-frequency ultrasonic, high-frequency ultrasonic is transmitted in the check point of boiler tube to be measured through the couplant on the entrant sound voussoir on high frequency probe and boiler tube surface to be measured, and be divided into two-way, wherein return through the internal surface reflection of boiler tube current detection point oxidation layer on inner wall to be measured in a road, return through the internal surface reflection of boiler tube current detection point metal level to be measured in another road, receiving end in high frequency probe receives the two-way high-frequency ultrasonic reflected, then the described two-way high-frequency ultrasonic reflected is forwarded in oscillograph,
4) obtained the mistiming between the two-way high-frequency ultrasonic that reflects by oscillograph, and calculate the thickness of boiler tube current detection point oxidation layer on inner wall to be measured according to the described mistiming;
5) mobile high frequency probe chooses next check point, repeats step 3) and 4) the thickness of the next check point oxidation layer on inner wall of next boiler tube to be measured;
6) step 5 is repeated), obtain the thickness of all check point oxidation layer on inner walls on boiler tube, then judge whether the boiler tube oxidation layer on inner wall at each check point place peels off according to the thickness of check point oxidation layer on inner walls all on boiler tube to be measured.
Described high frequency ultrasound wave frequency is 15MHz.
Step 1) in polishing scope be 10mm × 20mm.
It should be noted that, when judging whether the boiler tube oxidation layer on inner wall at each check point place peels off according to the thickness of check point oxidation layer on inner walls all on boiler tube to be measured, by the otherness of the thickness of check point oxidation layer on inner walls all on boiler tube more to be measured, when the otherness of all check point inner wall oxide layer thicknesses is more than or equal to preset range (>=0.1mm), then illustrate that peeling off appears in the oxide layer of boiler tube inwall to be measured.
Claims (3)
1. the lossless detection method that peels off of boiler tube oxidation layer on inner wall, is characterized in that, comprise the following steps:
1) the detection position of boiler tube to be measured is determined, and mark the detection position of boiler tube to be measured, polished in the surface of the detection position of boiler tube to be measured again, eliminate the oxide scale layer of tested boiler tube outer wall, then give the detection position daubing coupling agent of boiler tube to be measured;
2) high frequency probe is contacted with any one check point of boiler tube to be measured;
3) high-frequency pulse voltage sent by impulse ejection instrument delivers to ultrasonic transducer, produce high-frequency ultrasonic, high-frequency ultrasonic is transmitted in the check point of boiler tube to be measured through the couplant on the entrant sound voussoir on high frequency probe and boiler tube surface to be measured, and be divided into two-way, wherein return through the internal surface reflection of boiler tube current detection point oxidation layer on inner wall to be measured in a road, return through the internal surface reflection of boiler tube current detection point metal level to be measured in another road, receiving end in high frequency probe receives the two-way high-frequency ultrasonic reflected, then the described two-way high-frequency ultrasonic reflected is forwarded in oscillograph,
4) obtained the mistiming between the two-way high-frequency ultrasonic that reflects by oscillograph, and calculate the thickness of boiler tube current detection point oxidation layer on inner wall to be measured according to the described mistiming;
5) mobile high frequency probe chooses next check point, repeats step 3) and 4) the thickness of the next check point oxidation layer on inner wall of boiler tube to be measured;
6) step 5 is repeated), obtain the thickness of all check point oxidation layer on inner walls on boiler tube, then judge whether the boiler tube oxidation layer on inner wall at each check point place peels off according to the thickness of check point oxidation layer on inner walls all on boiler tube.
2. the lossless detection method that peels off of boiler tube oxidation layer on inner wall according to claim 1, it is characterized in that, described high frequency ultrasound wave frequency is 15MHz.
3. the lossless detection method that peels off of boiler tube oxidation layer on inner wall according to claim 1, is characterized in that, step 1) in the scope of polishing be 10mm × 20mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510182261.4A CN104792876A (en) | 2015-04-16 | 2015-04-16 | Nondestructive testing method for peel-off of oxidation layer on inner wall of boiler tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510182261.4A CN104792876A (en) | 2015-04-16 | 2015-04-16 | Nondestructive testing method for peel-off of oxidation layer on inner wall of boiler tube |
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| CN104792876A true CN104792876A (en) | 2015-07-22 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572226A (en) * | 2016-01-27 | 2016-05-11 | 中国大唐集团科学技术研究院有限公司西北分公司 | Measurement method for depositing amount of oxide skin inside boiler pipe |
| CN108614036A (en) * | 2018-04-23 | 2018-10-02 | 国电锅炉压力容器检验中心 | A kind of hierarchical detection method and system of boiler tubing internal oxidition skin |
| CN109060962A (en) * | 2018-08-14 | 2018-12-21 | 中国石油大学(北京) | Test the device of different height sedimentary relative hardness and its application in crude oil storage tank |
| CN110470254A (en) * | 2019-09-26 | 2019-11-19 | 西安热工研究院有限公司 | A kind of pipeline creep measurement system and method |
| CN110549351A (en) * | 2019-09-19 | 2019-12-10 | 中国科学院合肥物质科学研究院 | material oxide layer polishing robot control system and control method thereof |
| CN111141819A (en) * | 2019-09-20 | 2020-05-12 | 盐城新耀模具有限公司 | Method for detecting damage to inner wall of mold body |
| CN112014539A (en) * | 2020-07-23 | 2020-12-01 | 安徽中煊锅炉有限公司 | Method for monitoring service life loss state of boiler tube |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040069066A1 (en) * | 2001-03-28 | 2004-04-15 | Martin Dust | Method for the ultrasound measuring of layer thicknesses of cladding tubes for nuclear fuel |
| CN1590981A (en) * | 2003-08-29 | 2005-03-09 | 国电热工研究院 | Manufacturing method of heat exchanger pipe corrusion monitoring sensor |
| CN102305607B (en) * | 2011-05-24 | 2013-03-06 | 华北电力大学 | Calibration method for measuring thickness of oxidation layer on inner wall of boiler tube by ultrasonic wave |
| CN203949903U (en) * | 2014-07-04 | 2014-11-19 | 西安热工研究院有限公司 | A kind of ultrasonic probe that detects turbine generator Alloy bearing liner bonding state |
-
2015
- 2015-04-16 CN CN201510182261.4A patent/CN104792876A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040069066A1 (en) * | 2001-03-28 | 2004-04-15 | Martin Dust | Method for the ultrasound measuring of layer thicknesses of cladding tubes for nuclear fuel |
| CN1590981A (en) * | 2003-08-29 | 2005-03-09 | 国电热工研究院 | Manufacturing method of heat exchanger pipe corrusion monitoring sensor |
| CN102305607B (en) * | 2011-05-24 | 2013-03-06 | 华北电力大学 | Calibration method for measuring thickness of oxidation layer on inner wall of boiler tube by ultrasonic wave |
| CN203949903U (en) * | 2014-07-04 | 2014-11-19 | 西安热工研究院有限公司 | A kind of ultrasonic probe that detects turbine generator Alloy bearing liner bonding state |
Non-Patent Citations (1)
| Title |
|---|
| 崔雄华等: "高温锅炉管内壁氧化皮无损检测及剥落风险评估", 《第九届电站金属材料学术年会》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572226A (en) * | 2016-01-27 | 2016-05-11 | 中国大唐集团科学技术研究院有限公司西北分公司 | Measurement method for depositing amount of oxide skin inside boiler pipe |
| CN105572226B (en) * | 2016-01-27 | 2018-05-18 | 中国大唐集团科学技术研究院有限公司西北分公司 | A kind of boiler tube internal oxidition skin deposits measuring method |
| CN108614036A (en) * | 2018-04-23 | 2018-10-02 | 国电锅炉压力容器检验中心 | A kind of hierarchical detection method and system of boiler tubing internal oxidition skin |
| CN109060962A (en) * | 2018-08-14 | 2018-12-21 | 中国石油大学(北京) | Test the device of different height sedimentary relative hardness and its application in crude oil storage tank |
| CN109060962B (en) * | 2018-08-14 | 2020-10-27 | 中国石油大学(北京) | Device for testing relative hardness of settled layers with different heights in crude oil storage tank and application thereof |
| CN110549351A (en) * | 2019-09-19 | 2019-12-10 | 中国科学院合肥物质科学研究院 | material oxide layer polishing robot control system and control method thereof |
| CN110549351B (en) * | 2019-09-19 | 2020-10-30 | 中国科学院合肥物质科学研究院 | Material oxide layer polishing robot control system and control method thereof |
| CN111141819A (en) * | 2019-09-20 | 2020-05-12 | 盐城新耀模具有限公司 | Method for detecting damage to inner wall of mold body |
| CN110470254A (en) * | 2019-09-26 | 2019-11-19 | 西安热工研究院有限公司 | A kind of pipeline creep measurement system and method |
| CN112014539A (en) * | 2020-07-23 | 2020-12-01 | 安徽中煊锅炉有限公司 | Method for monitoring service life loss state of boiler tube |
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Application publication date: 20150722 |