CN113358699B - Boiler tube aging degree rapid evaluation method based on signal group delay measurement - Google Patents
Boiler tube aging degree rapid evaluation method based on signal group delay measurement Download PDFInfo
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- CN113358699B CN113358699B CN202110551277.3A CN202110551277A CN113358699B CN 113358699 B CN113358699 B CN 113358699B CN 202110551277 A CN202110551277 A CN 202110551277A CN 113358699 B CN113358699 B CN 113358699B
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Abstract
The invention relates to a boiler tube aging degree rapid evaluation method based on signal group delay measurement, which adopts a group delay measurer to measure the signal frequency dispersion of signals flowing through tubes to measure the aging degree of long-time heating load of heat-resisting tubes of a boiler, and comprises the following steps: the method comprises the following steps: a certain length of boiler heated aging pipe is connected into a group delay measuring circuit, and a contact is processed to ensure good electric contact; step two: measuring the signal group delay of the pipe according to the signal group delay measuring method; step three: measuring the signal group delay of boiler tubes with the same specification and material and different aging degrees to form a database; step four: accessing the boiler tubes to the group delay measuring system for measurement, and comparing the measured result with the group delay results of the tubes with different damage degrees in the database; step five: and evaluating the deterioration degree of the material of the boiler pipe through result comparison. The invention improves the efficiency of detecting the aging degree 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 boiler tube aging degree rapid evaluation method based on signal group delay measurement.
Background
In the long-term service process of the boiler tube in a high-temperature environment, the internal organization structure is changed, so that the strength of the tube is reduced, the high-temperature oxidation resistance is poor, even tube explosion is generated to cause furnace shutdown, and the like. The aging degree of the material is usually detected by methods such as metallographic phase and mechanical property tests, but the methods usually require tube 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 signal group delay measurement, which considers that the aging of an internal organization structure of a metal material directly influences the electrical characteristics of the material, such as frequency dispersion effect on an electrical signal, electrical conductivity change and the like. The degree of aging of the boiler tube is indirectly evaluated by detecting the change in the electrical characteristics.
The invention provides a boiler tube aging degree rapid evaluation method based on signal group delay measurement, which adopts a group delay measurer to measure the signal frequency dispersion of signals flowing through tubes to measure the aging degree of long-time heating load of heat-resisting tubes of a boiler, and comprises the following steps:
the method comprises the following steps: a certain length of the boiler heated aging pipe is connected into a group delay measuring circuit, and a contact is processed to ensure good electric contact;
step two: measuring the signal group delay of the pipe according to the signal group delay measuring method;
step three: measuring the signal group delay of boiler tubes with the same specification and material and different aging degrees to form a database;
step four: accessing the boiler tubes to the group delay measuring system for measurement, and comparing the measured result with the group delay results of the tubes with different damage degrees in the database;
step five: and evaluating the deterioration degree of the material of the boiler pipe through result comparison.
The invention also provides a boiler tube aging degree rapid evaluation method based on signal group delay measurement, which adopts a group delay measurer to measure the signal frequency dispersion of signals flowing through tubes to measure the aging degree of the heat-resisting boiler tubes under long-time heating load, and comprises the following steps:
step 1, connecting a boiler heated aging pipe with a certain length into a group delay measuring circuit, and processing a contact to ensure good electric contact;
step 2, measuring the signal group delay of the pipe according to a signal group delay measuring method;
step 3, measuring the signal group delay of boiler tubes made of other similar specifications;
and 4, comparing the batch of measurement data, and judging that the aging degree of the pipe is different from other aging degrees when abnormal data exists.
According to the scheme, the aging degree of the boiler tube is evaluated by utilizing the bandwidth change of the aging grain structure change of the tube in the signal transmission process through the rapid evaluation method of the aging degree of the boiler tube based on the signal group delay measurement, the aging degree of the heat-resisting tube of the boiler under long-time heating load is measured by measuring the signal dispersion of the signal flowing through the tube through the group delay measurer, the aging degree detection efficiency of the aging degree of the boiler tube is improved, and the detection cost is reduced.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The embodiment provides a method for rapidly evaluating the aging degree of boiler tubes based on signal group delay measurement, which measures the aging degree of heat-resisting boiler tubes subjected to long-time heating load by measuring signal frequency dispersion after signals flow through the tubes by using a group delay measurer.
The aging of the heat-resistant steel pipe after service mainly has the following effects:
graphitizing carbon steel;
spheroidizing carbide of pearlite steel;
the martensitic steel is ferritized, carbide is coarsened, and carbide and a new phase are precipitated;
martensite transformation of austenitic steel and aggregation of austenite steel dispersoid precipitates
The common points of the above aging conditions are: the uniform structure is gradually and locally uneven in the service process, a new precipitated phase is generated, a new interface is formed, and the grain size is increased.
This change in the material causes a change in its conductive properties: the group delay of the signal during transmission changes.
By utilizing the influence of the aging of the material on the signal transmission, the aging degree of the boiler tube can be rapidly detected.
The method specifically comprises the following steps:
the method comprises the following steps: a certain length of boiler heated aging pipe is connected into a group delay measuring circuit, and a contact is processed to ensure good electric contact;
step two: measuring the signal group delay of the pipe according to the signal group delay measuring method;
step three: measuring the signal group delay of boiler tubes with the same specification and material and different aging degrees to form a database;
step four: accessing the boiler pipe to be measured into a group delay measuring system for measurement, and comparing the measured result with the group delay results of pipes with different damage degrees in a database;
step five: and evaluating the deterioration degree of the material of the boiler pipe through result comparison.
Sometimes, in order to quickly pick out the tube with abnormal material, the method can be carried out according to the following steps without using a database:
the method comprises the following steps: a certain length of boiler heated aging pipe is connected into a group delay measuring circuit, and a contact is processed to ensure good electric contact;
step two: measuring the signal group delay of the pipe according to the signal group delay measuring method;
step three: measuring the signal group delay of boiler tubes of other similar specifications;
step four: comparing the batch of measurement data, and judging that the aging degree of the pipe is different from other aging degrees when abnormal data exists.
The group delay measurement method is described in GB/T17737.108 coaxial communication cable parts 1-108: the electrical test method is carried out by characteristic impedance, phase delay, group delay, electrical length and propagation speed tests, and a certain length of boiler heated pipe is used as a system to be tested.
According to the boiler tube aging degree rapid evaluation method based on the signal group delay measurement, the aging degree of the tube is evaluated according to the bandwidth change of the signal transmission process caused by the grain structure change after the tube is aged, the aging degree of the heat-resisting tube of the boiler under long-time heating load is measured by measuring the signal dispersion after the signal flows through the tube by adopting the group delay measurer, the boiler tube aging degree detection efficiency is improved, and the detection cost is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (1)
1. A boiler tube aging degree rapid evaluation method based on signal group delay measurement is characterized in that a group delay measurer is adopted to measure the aging degree of a boiler heat-resisting tube under long-time heating load by measuring signal frequency dispersion after signals flow through the tube, and the method comprises the following steps:
the method comprises the following steps: a certain length of boiler heated aging pipe is connected into a group delay measuring circuit, and a contact is processed to ensure good electric contact;
step two: measuring the signal group delay of the pipe according to the signal group delay measuring method;
step three: measuring the signal group delay of boiler tubes with the same specification and material and different aging degrees to form a database;
step four: accessing the boiler pipe to be measured into a group delay measuring system for measurement, and comparing the measured result with the group delay results of pipes with different aging degrees in a database;
step five: and evaluating the aging degree of the material of the boiler pipe through result comparison.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1484035A (en) * | 2002-09-17 | 2004-03-24 | 联发科技股份有限公司 | Group delay test method and device thereof |
| CN104458913A (en) * | 2014-12-17 | 2015-03-25 | 厦门大学 | Nonlinear guide wave evaluation method and nonlinear guide wave evaluation device of material performance degradation |
| CN105842334A (en) * | 2016-03-22 | 2016-08-10 | 西安热工研究院有限公司 | Magnetization intensity based TP304H boiler pipe material damage degree detection method |
| CN108152133A (en) * | 2017-12-12 | 2018-06-12 | 国电锅炉压力容器检验中心 | A kind of heat-resisting steel part deterioration appraisal procedure |
| CN109142532A (en) * | 2018-09-30 | 2019-01-04 | 武汉大学 | A kind of lossless detection method and device of the damage of high martensitic chromium heat resisting steel connector creep hole |
| CN109813962A (en) * | 2018-12-27 | 2019-05-28 | 中电科仪器仪表有限公司 | Frequency conversion system group delay measurement method and system based on Hilbert transform |
| CN112326738A (en) * | 2020-11-23 | 2021-02-05 | 华能国际电力股份有限公司 | Boiler flue gas side corrosion on-line monitoring device based on resistance measurement technology |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL2929342T3 (en) * | 2012-12-10 | 2020-05-18 | Arcelormittal | Method for determining the health and remaining service life of austenitic steel reformer tubes and the like |
| GB201601609D0 (en) * | 2016-01-28 | 2016-03-16 | Univ Cranfield | Corrosion detection system |
-
2021
- 2021-05-20 CN CN202110551277.3A patent/CN113358699B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1484035A (en) * | 2002-09-17 | 2004-03-24 | 联发科技股份有限公司 | Group delay test method and device thereof |
| CN104458913A (en) * | 2014-12-17 | 2015-03-25 | 厦门大学 | Nonlinear guide wave evaluation method and nonlinear guide wave evaluation device of material performance degradation |
| CN105842334A (en) * | 2016-03-22 | 2016-08-10 | 西安热工研究院有限公司 | Magnetization intensity based TP304H boiler pipe material damage degree detection method |
| CN108152133A (en) * | 2017-12-12 | 2018-06-12 | 国电锅炉压力容器检验中心 | A kind of heat-resisting steel part deterioration appraisal procedure |
| CN109142532A (en) * | 2018-09-30 | 2019-01-04 | 武汉大学 | A kind of lossless detection method and device of the damage of high martensitic chromium heat resisting steel connector creep hole |
| CN109813962A (en) * | 2018-12-27 | 2019-05-28 | 中电科仪器仪表有限公司 | Frequency conversion system group delay measurement method and system based on Hilbert transform |
| CN112326738A (en) * | 2020-11-23 | 2021-02-05 | 华能国际电力股份有限公司 | Boiler flue gas side corrosion on-line monitoring device based on resistance measurement technology |
Non-Patent Citations (6)
| Title |
|---|
| 《新型扭杆弹簧用高强度马氏体钢疲劳性能研究》;谌康等;《钢铁研究学报》;20210515;第33卷(第5期);全文 * |
| 《热电厂余热锅炉疏水管爆管失效分析》;陈鑫等;《热加工工艺》;20201130;第50卷(第10期);全文 * |
| 基于激光超声技术的探损检测技术研究;刘斌儒等;《机械制造与自动化》;20170620(第03期);全文 * |
| 奥氏体炉管在非破坏状态下的寿命评价新技术及其应用;刘国刚;《华东电力》;20050624(第06期);全文 * |
| 气体管道泄漏模态声发射时频定位方法;李帅永等;《仪器仪表学报》;20160915(第09期);全文 * |
| 锅炉管子的老化与使用寿命分析;桑原和夫等;《锅炉技术》;19810228(第02期);全文 * |
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