CN103901110A - Method for detecting scale cinders stacked in heated surface pipe - Google Patents
Method for detecting scale cinders stacked in heated surface pipe Download PDFInfo
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- CN103901110A CN103901110A CN201410107663.3A CN201410107663A CN103901110A CN 103901110 A CN103901110 A CN 103901110A CN 201410107663 A CN201410107663 A CN 201410107663A CN 103901110 A CN103901110 A CN 103901110A
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- heated surface
- cinders
- response signal
- surface pipe
- heating surface
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Abstract
The invention discloses a method for detecting scale cinders stacked in a heated surface pipe. The method comprises the following steps of exciting the heated surface pipe to be detected through continuous white noise; extracting an excitation response signal of the heated surface pipe; performing fast Fourier transformation on the extracted response signal, and extracting a spectrum of the response signal; and comparing the obtained spectrum with a test spectrum, and judging a stacking amount of the scale cinders on the inner wall of the pipe. The method is easy to operate, and the stacking amount of the scale cinders in the heated surface pipe can be quickly detected, so that the accident that the heated surface pipe of a boiler is exploded due to stacking of the scale cinders can be well prevented.
Description
Technical field
The present invention relates to pile up in a kind of heating surface tube the detection method of oxide skin.
Technical background
Along with the development of thermal power generating technology, super (super-) critical unit is used widely.But the frequent unit high temperature superheater inside pipe wall oxide skin occurring is peeled off and is deposited in pipe bottom, to stop up heating surface tube and cause pipe explosion accident, the security of serious threat genset, brings significant impact to electrical production and stability thereof.Detect at present 2 kinds of ray detection method and the magnetic detection methods that mainly contain of oxide skin in heating surface tube.Ray detection method is because being subject to the restriction of localized hyperthermia's panel-pipe of heating surface detection space, and can not carry out complete detection, also has radiation, the drawback such as long in time limit simultaneously.Magnetic detection side's ratio juris, to be ferrimagnetism based on oxide skin, by the oxide skin signal having magnetized in the externally measured pipe of paramagnetic austenite pipe, evaluate having or not or accumulating amount of oxide skin, thereby, the oxide skin that the method is only applicable to Austenitic stainless steel pipe detects, helpless to the tube on high-temperature heating surface of ferrite steel.The sound method of shaking is also used to detect high-temperature surface pipe bent position oxide skin and piles up, and knocks tube wall and is extracted in and in the situation of pipe free vibration, extracts vibration damping coefficient and survey oxide skin accumulating amount.
Summary of the invention
Technology to be solved by this invention is to provide a kind of easy and simple to handle, detection method of piling up fast oxide skin in heating surface tube.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A detection method of piling up oxide skin in heating surface tube, its step is as follows:
1) adopt continuous white noise to encourage the heating surface tube that will detect;
2) the exciter response signal of extraction heating surface tube;
3) to above-mentioned steps 2) response signal extracted does Fast Fourier Transform (FFT), extracts the frequency spectrum of response signal;
4) by above-mentioned steps 3) frequency spectrum that obtains and test spectral contrast, judge the accumulating amount of inside pipe wall oxide skin.
Principle of the present invention is as follows:
For a fixing structural member, the factor that affects its natural frequency comprises: the peripheral shape of the mass distribution in bending stiffness, the structural member of structural member, the boundary condition of structural member (being supporting form) and structural member etc.If the boundary condition of structural member, within bending stiffness is controlled at tolerance, the factor that can affect so structural member natural frequency only has the variation such as mass distribution and size of structural member.The mechanical hook-up of heating surface tube and scale inside being regarded as to certain degree of freedom, while firmly exciting, is comprising the full detail of whole mechanical hook-up in the vibration being excited.The exciter response of recording mechanism, processes and extracts its frequency spectrum.Before detection, need to first test and obtain test frequency spectrum (contrast is used), obtain the relation between oxide skin accumulating amount and spectrum offset, thereby judge the accumulating amount of oxide skin in heating surface tube by detection.
The beneficial effect that adopts technique scheme to produce is: the present invention is easy and simple to handle, and it can carry out fast detecting to oxide skin accumulating amount in heating surface tube, and then the pipe explosion accident of piling up due to oxide skin for heating surface tubes in boilers can well prevent.
Embodiment
Concrete grammar of the present invention is as follows:
1, adopt continuous white noise to encourage the heating surface tube that will detect;
Heating surface tube and scale inside are under the excitation of continuous white noise under the co-controlling of its inner particle in multiple modalities and forced vibration, vibration mode is compared with free vibration complexity, but the impact of oxidated skin, its vibration shape difference, the frequency spectrum of response signal is also different.Because white noise signal belongs to broadband signal, there is no obvious characteristic frequency, can guarantee that excitation source signal interference is avoided in the vibratory response of heating surface tube.
2, extract the exciter response signal of heating surface tube;
3, the response signal of step 2 being extracted is done Fast Fourier Transform (FFT), extracts the frequency spectrum of response signal;
4, frequency spectrum step 3 being obtained and test spectral contrast, judge the accumulating amount of inside pipe wall oxide skin.
Claims (1)
1. a detection method of piling up oxide skin in heating surface tube, is characterized in that: described method step is as follows:
1) adopt continuous white noise to encourage the heating surface tube that will detect;
2) the exciter response signal of extraction heating surface tube;
3) to above-mentioned steps 2) response signal extracted does Fast Fourier Transform (FFT), extracts the frequency spectrum of response signal;
4) by above-mentioned steps 3) frequency spectrum that obtains and test spectral contrast, judge the accumulating amount of inside pipe wall oxide skin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410107663.3A CN103901110A (en) | 2014-03-23 | 2014-03-23 | Method for detecting scale cinders stacked in heated surface pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410107663.3A CN103901110A (en) | 2014-03-23 | 2014-03-23 | Method for detecting scale cinders stacked in heated surface pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103901110A true CN103901110A (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410107663.3A Pending CN103901110A (en) | 2014-03-23 | 2014-03-23 | Method for detecting scale cinders stacked in heated surface pipe |
Country Status (1)
| Country | Link |
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| CN (1) | CN103901110A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN102033105A (en) * | 2010-11-25 | 2011-04-27 | 山东电力研究院 | Method for measuring deposition of scales at inner wall of Austenitic boiler tube based ultra-low-frequency vortex |
| KR20120104659A (en) * | 2011-03-14 | 2012-09-24 | 주식회사 피레타 | Non destructive inspection apparatus and its method for measurement of accumulated oxide scale |
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2014
- 2014-03-23 CN CN201410107663.3A patent/CN103901110A/en active Pending
Patent Citations (5)
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| JP2008014868A (en) * | 2006-07-07 | 2008-01-24 | Ishikawajima Inspection & Instrumentation Co | Method for measuring attached material, and apparatus for measuring the attached material |
| CN101509604A (en) * | 2009-03-20 | 2009-08-19 | 武汉大学 | Method and device for detecting and assessing deposit in metal pipe |
| CN101750011A (en) * | 2010-01-19 | 2010-06-23 | 广东拓奇电力技术发展有限公司 | Scale detecting instrument in tube on high-temperature heating surface of supercritical boiler and detection method |
| CN102033105A (en) * | 2010-11-25 | 2011-04-27 | 山东电力研究院 | Method for measuring deposition of scales at inner wall of Austenitic boiler tube based ultra-low-frequency vortex |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110389174B (en) * | 2018-04-17 | 2022-08-30 | 上海明华电力科技有限公司 | Method for detecting thickness of oxide skin on inner wall of heating surface pipe of power station boiler by electromagnetic ultrasonic |
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Application publication date: 20140702 |
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