CN103983177A - Heated surface tube inner oxide skin accumulation condition detection method - Google Patents
Heated surface tube inner oxide skin accumulation condition detection method Download PDFInfo
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- CN103983177A CN103983177A CN201410107664.8A CN201410107664A CN103983177A CN 103983177 A CN103983177 A CN 103983177A CN 201410107664 A CN201410107664 A CN 201410107664A CN 103983177 A CN103983177 A CN 103983177A
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- oxide skin
- surface tube
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- heated surface
- skin accumulation
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Abstract
The invention discloses a heated surface tube inner oxide skin accumulation condition detection method. The method comprises the following steps: an exciting coil is wound around a heated surface tube of which the oxide skin accumulation volume is to be detected, and the coil is energized with a low-frequency alternating current of which the frequency is less than 50Hz; a measuring coil is wound around the detected heated surface tube at a position which is away from the exciting coil for a certain distance L; the induced electromotive force E of two ends of the coil described in the step2 is measured; and the measured data is compared with the test data to judge the tube inner wall oxide skin accumulation volume. The method has the advantage of convenient operation, the method can be used to perform fast detection on heated surface tube inner oxide skin accumulation volume, and the tube explosion accident of a boiler heated surface tube due to oxide skin accumulation can be prevented well.
Description
Technical field
The present invention relates to a kind of method that detects oxide skin accumulation situation in heating surface tube.
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., also there is radiation, the drawback such as long in time limit simultaneously in the restriction of ray detection method Yin Shou localized hyperthermia panel-pipe of heating surface detection space, and can not carry out complete detection.Also there is at present the technology that adopts magnetic detection oxide skin.Principle is 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.
Summary of the invention
Technology to be solved by this invention is to provide a kind of method that detects oxide skin accumulation situation in heating surface tube by coiling mode, and the method is easy to operate, detection is rapid.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of method that detects oxide skin accumulation situation in heating surface tube, and its step is as follows:
1, with drive coil, be wrapped on the heating surface tube that will detect oxide skin accumulating amount, and to the logical following low-frequency ac electric current of 50Hz of coil;
2, measuring coil is wrapped on tested heating surface tube and apart from drive coil certain distance L position;
3, the induction electromotive force E at coil two ends described in measuring process 2;
4, by the data that record and test figure contrast, the accumulating amount of judgement inside pipe wall oxide skin.
Principle of the present invention is as follows:
After hollow drive coil indirect current, drive coil produces an axial alternating magnetic field Hp, by coil winding on tested ferrimagnet during indirect current, at H
punder effect, material to be detected is by alternating magnetization, and its result has strengthened original alternating magnetic field, the additional alternating magnetic field that the eddy current inducing in the demagnetizing field of ferromagnetism inside and material produces, both sum H
salways play the effect that reduces former externally-applied magnetic field.In order to facilitate the measurement of magnetic permeability, introduce Effective permeability u
eff.Measuring coil is also wrapped on tested ferrimagnet, can on by test coil, generates electromotive force, electromotive force size is that E(is referring to accompanying drawing 1):
Magnetic test coil is this measuring coil, u
effsize with the amount of the inner ferrimagnetism oxide skin of heating surface tube changes, in the situation that f, D, n are constant, measuring coil induction electromotive force only with u
effrelevant, therefore can be by the accumulating amount of measuring coil two ends induction electromotive force E judgement heating surface tube scale inside.Before detection, need to first test and obtain data (being referred to as test figure in presents): according to the parameter detecting, detect the heating surface tube of the different amount of inner dress oxide skin, draw measuring coil induction electromotive force E when different oxide skin is piled up
d, obtain the relation of oxide skin accumulating amount and induction electromotive force.
The beneficial effect that adopts technique scheme to produce is: this method is easy to operate, and it can carry out fast detecting to oxide skin accumulating amount in heating surface tube, and the pipe explosion accident of piling up due to oxide skin for heating surface tubes in boilers can well prevent.
Accompanying drawing explanation
Fig. 1 is that solenoid is surveyed oxide skin schematic diagram.
Embodiment
This method concrete steps are as follows:
1, with drive coil, be wrapped on the heating surface tube that will detect oxide skin accumulating amount, and to the logical following low-frequency ac electric current of 50Hz of coil, the effective depth of penetration of electric current is greater than thickness of pipe and can sees through oxide skin ulking thickness;
2, measuring coil is wrapped in to distance drive coil certain distance L position on tested heating surface tube;
3, the induction electromotive force at coil two ends described in measuring process 2;
4, by the data that record and test figure contrast, the accumulating amount of judgement inside pipe wall oxide skin.
Although this method also adopts magnetic detection oxide skin, but the mode of magnetization is different, detected heating surface tube scope is also different, uses the present invention not only can detect the oxide skin accumulating amount in nonferromagnetic heating surface tube, to the oxide skin accumulating amount in ferromagnetism heating surface tube, can effectively detect too.
Claims (1)
1. a method that detects oxide skin accumulation situation in heating surface tube, is characterized in that: described method adopts following steps:
1) with drive coil, be wrapped on the heating surface tube that will detect oxide skin accumulating amount, and to the logical following low-frequency ac electric current of 50Hz of drive coil;
2) measuring coil is wrapped on tested heating surface tube and apart from drive coil certain distance L position;
3) measuring process 2) the induction electromotive force E at described measuring coil two ends;
4) by the data that record and test figure contrast, the accumulating amount of judgement inside pipe wall oxide skin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410107664.8A CN103983177A (en) | 2014-03-23 | 2014-03-23 | Heated surface tube inner oxide skin accumulation condition detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410107664.8A CN103983177A (en) | 2014-03-23 | 2014-03-23 | Heated surface tube inner oxide skin accumulation condition detection method |
Publications (1)
| Publication Number | Publication Date |
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| CN103983177A true CN103983177A (en) | 2014-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410107664.8A Pending CN103983177A (en) | 2014-03-23 | 2014-03-23 | Heated surface tube inner oxide skin accumulation condition detection method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612662A (en) * | 2014-12-31 | 2015-05-13 | 郑州光力科技股份有限公司 | Drilling depth measuring device for drill pipe and measuring method adopting same |
| CN107478147A (en) * | 2017-08-01 | 2017-12-15 | 湘潭大学 | Come off oxide skin ulking thickness pulse eddy current detection method and device in a kind of austenite boiler tube |
| CN111189972A (en) * | 2018-11-14 | 2020-05-22 | 国电锅炉压力容器检验有限公司 | Method for measuring equivalent weight of accumulated height of oxide skin in boiler tube |
| CN111189971A (en) * | 2018-11-14 | 2020-05-22 | 国电锅炉压力容器检验有限公司 | Method for measuring unit mass equivalent of oxide skin in boiler tube |
| CN112255270A (en) * | 2020-10-18 | 2021-01-22 | 吉林省电力科学研究院有限公司 | Infrared imaging detection method for oxide skin accumulation rate in electric eddy current heating type heating surface pipe |
| CN112378329A (en) * | 2020-10-21 | 2021-02-19 | 中国科学院金属研究所 | Eddy current detection method for thickness of corrosion layer on inner wall of austenite pipe |
| CN114643537A (en) * | 2022-03-14 | 2022-06-21 | 长沙矿冶研究院有限责任公司 | Automatic sand inspection device and method for sand supply tank of high-pressure water jet cleaning equipment |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612662A (en) * | 2014-12-31 | 2015-05-13 | 郑州光力科技股份有限公司 | Drilling depth measuring device for drill pipe and measuring method adopting same |
| CN107478147A (en) * | 2017-08-01 | 2017-12-15 | 湘潭大学 | Come off oxide skin ulking thickness pulse eddy current detection method and device in a kind of austenite boiler tube |
| CN107478147B (en) * | 2017-08-01 | 2019-12-06 | 湘潭大学 | Pulse eddy current detection method and device for thickness of accumulated scale falling off in austenitic boiler tube |
| CN111189972A (en) * | 2018-11-14 | 2020-05-22 | 国电锅炉压力容器检验有限公司 | Method for measuring equivalent weight of accumulated height of oxide skin in boiler tube |
| CN111189971A (en) * | 2018-11-14 | 2020-05-22 | 国电锅炉压力容器检验有限公司 | Method for measuring unit mass equivalent of oxide skin in boiler tube |
| CN112255270A (en) * | 2020-10-18 | 2021-01-22 | 吉林省电力科学研究院有限公司 | Infrared imaging detection method for oxide skin accumulation rate in electric eddy current heating type heating surface pipe |
| CN112255270B (en) * | 2020-10-18 | 2024-05-07 | 吉林省电力科学研究院有限公司 | Infrared imaging detection method for stacking rate of oxide scale in electric vortex heating type heating surface tube |
| CN112378329A (en) * | 2020-10-21 | 2021-02-19 | 中国科学院金属研究所 | Eddy current detection method for thickness of corrosion layer on inner wall of austenite pipe |
| CN114643537A (en) * | 2022-03-14 | 2022-06-21 | 长沙矿冶研究院有限责任公司 | Automatic sand inspection device and method for sand supply tank of high-pressure water jet cleaning equipment |
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Application publication date: 20140813 |