CN113466551B - Cut-off frequency measurement-based method for rapidly evaluating aging degree of boiler tube - Google Patents
Cut-off frequency measurement-based method for rapidly evaluating aging degree of boiler tube Download PDFInfo
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- CN113466551B CN113466551B CN202110552027.1A CN202110552027A CN113466551B CN 113466551 B CN113466551 B CN 113466551B CN 202110552027 A CN202110552027 A CN 202110552027A CN 113466551 B CN113466551 B CN 113466551B
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- aging
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- 230000032683 aging Effects 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 239000006185 dispersion Substances 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000006866 deterioration Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention relates to a method for rapidly evaluating the aging degree of a boiler tube based on cut-off frequency measurement, which adopts a cut-off frequency measurer to measure the signal dispersion of a signal flowing through the tube and measures the aging degree of a heat-resistant tube of the boiler under long-time heat load, and comprises the following steps: step one: the heat aging tube of the boiler with the length of 1m to be measured is connected to a cut-off frequency measuring circuit, and the contact is used for processing, so that good electric contact is ensured; step two: using a special signal tester to test the upper limit and the lower limit of the cut-off frequency of the boiler tube by using sine sweep frequency signals; step three: repeating the second step for measuring the boiler tubes with different ageing degrees and the same specification and material length of 1m to form a database; step four: comparing the measured results of the aged boiler tubes with the high and low cut-off frequency results of the tubes with different damage degrees in the built database; step five: the degree of deterioration of the material of the boiler tube was evaluated by comparison of the results. The invention improves the aging degree detection efficiency of the boiler tube and reduces the detection cost.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a method for rapidly evaluating ageing degree of a boiler tube based on cut-off frequency measurement.
Background
In the long-term service process of the boiler pipe in a high-temperature environment, the internal organization structure is changed, so that the strength of the pipe is reduced, the high-temperature oxidation resistance is poor, and the like, and even the pipe burst is generated to cause the furnace shutdown, and the like. The aging degree of the materials is usually detected by adopting metallographic phase, mechanical property test and other methods, but the methods generally need pipe cutting, have low detection efficiency and have higher cost.
Disclosure of Invention
The invention aims to provide a method for rapidly evaluating the aging degree of a boiler tube based on cut-off frequency measurement, which takes the fact that the aging of an internal tissue structure of a metal material directly affects the electrical characteristics of the material, such as the frequency bandwidth, the dispersion effect, the conductivity change and the like of an electric signal into consideration, and indirectly evaluates the aging degree of the boiler tube by detecting the electrical characteristic change.
The invention provides a method for rapidly evaluating the aging degree of a boiler tube based on cut-off frequency measurement, which adopts a cut-off frequency measurer to measure the signal dispersion of a signal flowing through the tube and measures the aging degree of a heat-resistant tube of the boiler under long-time heat load, and comprises the following steps:
step one: the heat aging tube of the boiler to be measured with the length of 1m is connected to a cut-off frequency measuring circuit, and the contact is processed to ensure good electric contact;
step two: using a special signal tester to test the upper limit and the lower limit of the cut-off frequency of the boiler tube by using sine sweep frequency signals;
step three: repeating the second step for measuring the boiler tubes with different ageing degrees and the same specification and material length of 1m to form a database;
step four: comparing the measured results of the aged boiler tubes with the high and low cut-off frequency results of the tubes with different damage degrees in the built database;
step five: the degree of deterioration of the material of the boiler tube was evaluated by comparison of the results.
The invention also provides a method for rapidly evaluating the aging degree of the boiler tube based on the cut-off frequency measurement, which adopts a cut-off frequency measurer to measure the signal dispersion of the signal flowing through the tube and measures the aging degree of the heat-resistant tube of the boiler under long-time heat load, and comprises the following steps:
step 1, connecting a certain length of boiler heat aging pipe to a cut-off frequency measuring circuit, and processing contacts to ensure good electrical contact;
step 2, testing the upper limit and the lower limit of the cut-off frequency of the boiler tube by using a special signal tester and using sine sweep frequency signals;
step 3, measuring the cut-off frequency of the boiler tubes made of other similar specifications;
and step 4, comparing the batch of measurement data, and judging that the aging degree of the pipe is different from other pipes when abnormal data exist.
By means of the scheme, the aging degree of the tube is evaluated by the rapid evaluation method of the aging degree of the boiler tube based on the cut-off frequency measurement, the aging degree of the tube is evaluated by utilizing the bandwidth change of the grain structure change of the aged tube in the signal transmission process, the aging degree of the heat-resistant tube of the boiler for a long time is measured by measuring the cut-off frequency of the tube by using a bandwidth test instrument, the aging degree detection efficiency of the boiler tube is improved, and the detection cost is reduced.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The embodiment provides a method for rapidly evaluating the aging degree of a boiler tube based on cut-off frequency measurement, which adopts a cut-off frequency measurer to measure the signal dispersion of a signal flowing through the tube and measure the aging degree of a heat-resistant tube of the boiler under long-time heat load.
Aging of the heat-resistant steel pipe after sub-service mainly has the following effects:
graphitizing carbon steel;
spheroidizing pearlite steel carbide;
the martensitic steel is ferritic, has coarsening of carbide, and precipitation of carbide and new phase;
martensite transformation of austenitic steel and growth of dispersed precipitated phase aggregation of austenitic steel
Common to the above aging conditions is: the uniform structure is gradually and locally uneven in the service process, new precipitated phases are generated, new interfaces are formed, and the grain size is increased.
This change in material results in a change in its conductive properties: the high and low cut-off frequencies of the signal change during transmission.
The aging degree of the boiler pipe can be rapidly detected by utilizing the influence of material aging on signal transmission.
The method specifically comprises the following steps:
step one: the heat aging tube of the boiler to be measured with the length of 1m is connected to a cut-off frequency measuring circuit, and the contact points are treated to ensure good electric contact;
step two: using a special signal tester to test the upper limit and the lower limit of the cut-off frequency of the boiler tube by using sine sweep frequency signals;
step three: measuring repeated steps II of boiler tubes with different ageing degrees and the length of 1m of the same-specification material to form a database;
step four: comparing the measured results of the aged boiler tubes with the high and low cut-off frequency results of the tubes with different damage degrees in the built database;
step five: the degree of deterioration of the material of the boiler tube was evaluated by comparison of the results.
Sometimes, in order to quickly pick out the pipe with abnormal material quality, a database is not used, and the method is carried out according to the following steps:
step one: the heat aging tube of a boiler with a certain length is connected to a cut-off frequency measuring circuit, and the contact points are treated to ensure good electric contact;
step two: using a special signal tester to test the upper limit and the lower limit of the cut-off frequency of the boiler tube by using sine sweep frequency signals;
step three: measuring the cut-off frequency of the boiler tubes made of other similar specifications;
step four: comparing the measured data of the batch, if abnormal data exists, the aging degree of the pipe can be judged to be different from other pipes.
According to the method for rapidly evaluating the ageing degree of the boiler tube based on the cut-off frequency measurement, the ageing degree of the tube is evaluated by utilizing the bandwidth change of the grain structure change of the aged tube in the signal transmission process, and the ageing degree of the heat-resistant tube of the boiler for a long time is measured by measuring the cut-off frequency of the tube by adopting a bandwidth test instrument, so that the ageing degree detection efficiency of the boiler tube is improved, and the detection cost is reduced.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (2)
1. A method for rapidly evaluating the aging degree of a boiler tube based on cut-off frequency measurement is characterized in that a cut-off frequency measurer is adopted to measure the signal dispersion of a signal flowing through the tube to measure the aging degree of a heat-resistant tube of the boiler under long-time heat load, and the method comprises the following steps:
step one: the method comprises the steps of connecting a to-be-measured boiler heat aging tube into a cut-off frequency measuring circuit, and processing contacts to ensure good electrical contact;
step two: using a special signal tester to test the upper limit and the lower limit of the cut-off frequency of the boiler tube by using sine sweep frequency signals;
step three: repeating the second step for measuring the boiler tubes with different aging degrees and the same specification and material length to form a database;
step four: comparing the measured results of the aged boiler tubes with the high and low cut-off frequency results of the tubes with different damage degrees in the built database;
step five: the degree of aging of the boiler tubes was assessed by comparison of the results.
2. The method for rapidly evaluating the ageing degree of a boiler tube based on cut-off frequency measurement according to claim 1, wherein the heat ageing tube of the boiler to be tested is 1m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110552027.1A CN113466551B (en) | 2021-05-20 | 2021-05-20 | Cut-off frequency measurement-based method for rapidly evaluating aging degree of boiler tube |
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| CN202110552027.1A CN113466551B (en) | 2021-05-20 | 2021-05-20 | Cut-off frequency measurement-based method for rapidly evaluating aging degree of boiler tube |
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| CN113466551A CN113466551A (en) | 2021-10-01 |
| CN113466551B true CN113466551B (en) | 2024-03-19 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05273293A (en) * | 1992-03-27 | 1993-10-22 | Mitsubishi Cable Ind Ltd | Insulation deterioration diagnostic method of power cable |
| US5970434A (en) * | 1998-01-29 | 1999-10-19 | Southwest Research Institute | Method for determining average wall thickness for pipes and tubes using guided waves |
| CN104090214A (en) * | 2014-07-31 | 2014-10-08 | 成都高斯电子技术有限公司 | Cable fault detection and aging analysis method |
| CN105866647A (en) * | 2016-06-08 | 2016-08-17 | 西安交通大学 | XLPE insulation aging state evaluation method based on different frequency dielectric loss ratios |
| CN108663311A (en) * | 2018-08-24 | 2018-10-16 | 青岛科技大学 | Online supersonic detection device and method based on waste plastic thermo-oxidative ageing degree |
| CN112505494A (en) * | 2020-10-30 | 2021-03-16 | 西安交通大学 | Method and device for evaluating insulation water content of oiled paper |
-
2021
- 2021-05-20 CN CN202110552027.1A patent/CN113466551B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05273293A (en) * | 1992-03-27 | 1993-10-22 | Mitsubishi Cable Ind Ltd | Insulation deterioration diagnostic method of power cable |
| US5970434A (en) * | 1998-01-29 | 1999-10-19 | Southwest Research Institute | Method for determining average wall thickness for pipes and tubes using guided waves |
| CN104090214A (en) * | 2014-07-31 | 2014-10-08 | 成都高斯电子技术有限公司 | Cable fault detection and aging analysis method |
| CN105866647A (en) * | 2016-06-08 | 2016-08-17 | 西安交通大学 | XLPE insulation aging state evaluation method based on different frequency dielectric loss ratios |
| CN108663311A (en) * | 2018-08-24 | 2018-10-16 | 青岛科技大学 | Online supersonic detection device and method based on waste plastic thermo-oxidative ageing degree |
| CN112505494A (en) * | 2020-10-30 | 2021-03-16 | 西安交通大学 | Method and device for evaluating insulation water content of oiled paper |
Non-Patent Citations (1)
| Title |
|---|
| 锅炉受热面管的材料失效与老化分析;由庆健;湖南农机;第40卷(第1期);70-71 * |
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