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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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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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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