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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- heating surface
- surface tube
- response signal
- oxide skin
- frequency spectrum
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- 238000000034 method Methods 0.000 title claims abstract description 7
- 239000003818 cinder Substances 0.000 title 1
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 238000001228 spectrum Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims description 13
- 239000000284 extract Substances 0.000 claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 230000005284 excitation Effects 0.000 abstract description 3
- 238000004880 explosion Methods 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract 3
- 230000004927 fusion Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 206010020843 Hyperthermia Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000005308 ferrimagnetism Effects 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005298 paramagnetic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
本发明公开了一种受热面管内堆积氧化皮的检测方法，其步骤如下：采用连续白噪声激励要检测的受热面管；提取受热面管的激励响应信号；对提取到的响应信号做快速傅里叶变换，提取响应信号的频谱；将得到的频谱和试验频谱对比，判断管内壁氧化皮的堆积量。本发明操作简便，其能对受热面管内氧化皮堆积量进行快速检测，进而对于锅炉受热面管由于氧化皮堆积的爆管事故能很好的预防。The invention discloses a method for detecting oxide skin accumulated in a heating surface tube. The steps are as follows: using continuous white noise to excite the heating surface tube to be detected; extracting the excitation response signal of the heating surface tube; performing fast Fusion on the extracted response signal. Lie transform to extract the frequency spectrum of the response signal; compare the obtained frequency spectrum with the test frequency spectrum to judge the accumulation of oxide skin on the inner wall of the pipe. The invention is simple and convenient to operate, can quickly detect the amount of scale accumulation in the heating surface tube, and can well prevent the explosion accident of the heating surface tube of the boiler due to the accumulation of scale.
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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| KR20120104659A (en) * | 2011-03-14 | 2012-09-24 | 주식회사 피레타 | Non destructive inspection apparatus and its method for measurement of accumulated oxide scale |
-
2014
- 2014-03-23 CN CN201410107663.3A patent/CN103901110A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| KR20120104659A (en) * | 2011-03-14 | 2012-09-24 | 주식회사 피레타 | Non destructive inspection apparatus and its method for measurement of accumulated oxide scale |
Non-Patent Citations (4)
| Title |
|---|
| 彭啸等: "高温受热面弯管氧化皮堆积的声振法检测研究", 《中国电机工程学报》 * |
| 李金峰等: "管壁金属层和氧化皮厚度高频超声波测量系统的建立", 《河北电力技术》 * |
| 樊新海编著: "《工程测试技术基础》", 31 August 2007 * |
| 许文本编著: "《机械振动与模态分析基础》", 31 August 1998 * |
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 |