Method for automatically measuring signal-to-noise ratio of in-service heat transfer pipe of steam generator
By setting the category code and correcting data, and using appropriate measurement windows to perform noise measurement, the problem of inaccurate signal-to-noise ratio measurement during the steam generator heat transfer tube is solved, and the accuracy of measurement is improved.
Patent Information
- Application Number
- CN202411833191.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-03-25
AI Technical Summary
The prior art cannot accurately measure the signal-to-noise ratio of the steam generator heat transfer tube during service, and is greatly affected by the installation structure.
By setting up the eddy current noise measurement category code of the steam generator heat transfer tube and correcting it, selecting defect-free tube data for analysis, using dynamic and fixed measurement windows for noise measurement, and generating a synthetic report to improve measurement accuracy.
It effectively reduces the impact of the installation structure on signal-to-noise ratio measurement and improves the accuracy of noise signal-to-noise ratio measurement during the service of the steam generator heat transfer tube.
Smart Images
Figure CN119688824A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of nuclear power, and in particular relates to an automatic measurement method for the signal-to-noise ratio of an in-service heat transfer tube of a steam generator. Background Art
[0002] The sensitivity and feasibility of eddy current testing of steam generator heat transfer tubes are determined by the signal-to-noise ratio (i.e., the ratio of the eddy current signal amplitude to the eddy current noise amplitude). The purpose of eddy current noise testing is to improve and ensure the feasibility of in-service testing of steam generator heat transfer tubes during their operating life.
[0003] For in-service heat transfer tubes, the relevant technology provides relevant detection software and methods to measure the signal-to-noise ratio of steam generator heat transfer tubes, and is applied to the detection of heat transfer tube manufacturers. Due to the influence of the installation structure (support plate, tube sheet area, anti-vibration strips), etc., the automatic measurement method cannot measure the accurate signal-to-noise ratio. Summary of the invention
[0004] In order to overcome the problems existing in the related art, a method for automatically measuring the signal-to-noise ratio of an in-service heat transfer tube of a steam generator is provided, the method comprising:
[0005] Import the original data group, read the setting parameters and analysis report;
[0006] Set the measurement category code of the eddy current noise of the steam generator heat transfer tube for each group of raw data and make corrections;
[0007] Select the defect-free pipe data corresponding to each category code, verify the positioning and start the analysis;
[0008] Set the parameters for heat transfer tube noise measurement and evaluation;
[0009] Measure the noise of different categories of codes for each heat transfer tube and save the noise report until the noise measurement of all data sources is completed;
[0010] Merge Report to generate a composite report of all noise data sources with different noise measurement codes.
[0011] In a possible implementation, the category codes include: FHL is used to indicate the hot end free section; FCL is used for the cold end free section; FUB is used for the bent tube free section; SCH is used for the hot end support plate center; SCC is used for the cold end support plate center; SEHU is used for the upper edge of the hot end support plate; SEHL is used for the lower edge of the hot end support plate; SECU is used for the upper edge of the cold end support plate; SECL is used for the lower edge of the cold end support plate; VSC is used for the anti-vibration strip; TTH is used for the upper edge of the hot end tube sheet; TTC is used for the upper edge of the cold end tube sheet.
[0012] In a possible implementation, for category codes FCL, FHL, and FUB, the full length of the free section of the heat transfer tube eddy current data collected by the bobbin probe is measured, using a dynamic measurement window with a default window width of 15.24 mm and a default step length of 15.24 mm. Adjacent windows do not need to be measured overlappingly.
[0013] In a possible implementation, for category codes SECU, SECL, SEHU, and SEHL, a fixed measurement window is used for the noise measurement on the upper and lower edges of the TSP support structure, and the window width is 2 / 3 of the width of the entire support plate.
[0014] In a possible implementation, for category codes SCC and SCH, a fixed measurement window is used for noise measurement at the center of the TSP support structure, and the window width is 1 / 3 of the width of the entire support plate.
[0015] In a possible implementation, for category code VSC, for noise measurement of a support structure width less than 12.7 mm, a single window spanning the support is selected for measurement, and the width of the AVB anti-vibration strip noise measurement window is the entire AVB width.
[0016] In one possible implementation, for category codes TTC and TTH, a dynamic measurement window is used in the tube sheet mud area, the window width is 12.7 mm, the measurement starting point is TTS+6.35 mm, the default step length is 12.7 mm, and the noise measurement range of the mud area is determined by the mud height L.
[0017] In one possible implementation, the following method is used to measure noise:
[0018] The main frequency analysis channel is selected in a specific area, and the maximum vertical component measurement method Vvm is used for noise measurement in all measurement channels.
[0019] The beneficial effects of the present disclosure are as follows: the present disclosure sets the steam generator heat transfer tube eddy current noise measurement category code for each group of original data and performs correction, selects the defect-free tube data corresponding to each category code, and starts the analysis after verifying that the positioning is correct, thereby being less affected by the installation structure and effectively solving the problem of automatic measurement of the eddy current signal-to-noise ratio in the tube sheet area, support structure area, shockproof strip area and free section. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of a support plate noise measurement selection range shown in an embodiment of the present disclosure.
[0021] Figure 2 It is a schematic diagram of a noise measurement selection range of the mud residue area on the upper edge of a tube plate shown in an embodiment of the present disclosure.
[0022] Figure 3 Schematic diagram of a heat transfer tube noise measurement method using the Vvm criterion shown in an embodiment of the present disclosure.
[0023] Figure 4 It is a schematic diagram of a heat transfer tube noise measurement and evaluation window interface shown in an embodiment of the present disclosure.
[0024] Figure 5 It is a schematic diagram of a support plate width setting interface shown in an embodiment of the present disclosure.
[0025] Figure 6 It is a schematic diagram of a noise measurement and report saving interface shown in an embodiment of the present disclosure.
[0026] Figure 7 It is a schematic diagram of a noise data report synthesis interface shown in an embodiment of the present disclosure.
[0027] Figure 8 It is a schematic diagram of the noise distribution characteristics of the free section of a straight pipe shown in an embodiment of the present disclosure.
[0028] Fig. 9 It is a schematic diagram of the cumulative probability distribution of noise in the free section of a straight pipe shown in an embodiment of the present disclosure. DETAILED DESCRIPTION
[0029] The present disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0030] Unless otherwise defined, the technical and scientific terms used in the present disclosure have the same meanings as those generally understood by those skilled in the art to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the term "including" and any variations thereof in the present disclosure are intended to cover non-exclusive inclusions. Obviously, the embodiments described in the present disclosure are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative efforts are within the scope of protection of the present disclosure.
[0031] Reference to "embodiments" in this disclosure means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the disclosure. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0032] As shown in Table 1, corresponding measurement category codes are set according to different measurement locations.
[0033] Table 1. Code for measurement category of eddy current noise of steam generator heat transfer tubes
[0034] FHL Hot end free section FCL Cold end free section FUB Free section of elbow SCH Hot end support plate center SCC Center of cold end support plate SEHU Upper edge of hot end support plate SEHL Bottom edge of hot end support plate SECU Upper edge of cold end support plate SECL Lower edge of cold end support plate VSC Anti-vibration strip TTH Upper edge of hot end tube plate TTC Upper edge of cold end tube sheet
[0035] The measurement range of each measurement location is determined as follows:
[0036] FCL, FHL and FUB are used to measure the full length of the free section of the heat transfer tube eddy current data collected by the bobbin probe. A dynamic measurement window is used, the default window width is 15.24mm (0.6 inches), the default step length is 15.24mm (0.6 inches), and adjacent windows do not need to overlap for measurement.
[0037] SECU, SECL, SEHU and SEHL are used to measure the noise at the upper and lower edges of the TSP support structure using a fixed measurement window with a window width of 2 / 3 of the entire support plate width, such as Figure 1 shown.
[0038] SCC and SCH are used to measure the center noise of the TSP support structure using a fixed measurement window, and the window width is 1 / 3 of the width of the entire support plate, such as Figure 1 shown.
[0039] VSC is used to measure noise for support structures with a width less than 12.7 mm (0.5 inches). A single window across the support is selected for measurement. The width of the AVB anti-vibration strip noise measurement window is the entire AVB width.
[0040] TTC and TTH are used to adopt dynamic measurement window for the tube sheet mud area. The window width is 12.7mm (0.5 inches). The measurement starting point is TTS+6.35mm (0.25 inches). The default step length is 12.7mm (0.5 inches). The noise measurement range of the mud area is generally determined by the mud height L. For example, Figure 2 shown.
[0041] Determine the noise measurement and select the main frequency analysis channel in a specific area, such as channel 1 for defects in the free section and P1 mixing channel for defects in the supporting structure; all measurement channels use the maximum vertical component measurement method V vm (ie VMX) for noise measurement, such as Figure 3 shown.
[0042] During the measurement process, use CEddy automatic analysis software to import the original data group, read the setting parameters and analysis report; set landmarks and make corrections to ensure accurate positioning; select defect-free tube data, verify that the positioning is correct, and click the intelligent analysis platform button; the heat transfer tube noise measurement evaluation window pops up, such as Figure 4 The noise measurement parameters are set as shown in the figure.
[0043] Set the different categories of codes accordingly. According to the data group summary information, the sampling rate is 1500dp / s, the acquisition speed is 600mm / s, the calculation sampling point is 2.5dp / mm, and the noise analysis method is CNPO.
[0044] For FHL, FCL, and FUB, the corresponding data points are converted according to the measurement window length, and the result is 15.24mm*2.5dp / mm=38.1dp. The noise window size of the free section of the straight pipe and the curved pipe area is selected as 40dp.
[0045] Among them, the measurement channel is 1 channel, the measurement method is Vmax, the measurement window is 40dp, the noise analysis method is CNPO, the step size is 40dp, and click the Update button after the settings are completed.
[0046] For SCH, SCC, SEHU, SEHL, SECU, and SECL, locate the center of the support plate in the positioning mark interface and set the actual width of the support plate to 20 mm, as follows Figure 5 As shown, the support plate center and edge picking windows will be written into the software program according to the actual width set (the support plate center measurement window is 1 / 3TSP, and the support plate upper and lower edge measurement window is 2 / 3TSP), and the rest of the settings are as follows.
[0047] The measurement channel is P1:1-5 channel, the measurement method is Vmax, the noise analysis method is CNPO, and the other options are empty. After the settings are completed, click the Update button.
[0048] For VSC, the vibration isolation bar noise measurement settings are the same as TSP. Locate the AVB center position on the positioning mark interface, set the actual width to 12mm, the measurement channel to P1: 1-5 channels, the measurement method to Vmax, and the noise analysis method to CNPO. Leave the remaining options blank. After the settings are completed, click the Update button.
[0049] For TTH and TTC, the noise measurement settings of the mud area on the upper edge of the tube plate refer to TSP, locate the TTS starting point on the positioning mark interface, set the TTS width to 14mm, the measurement channel to 1 channel, the measurement method: Vmax, the noise analysis method selects CNPO, and the other options are empty. After the settings are completed, click the Update button.
[0050] like Figure 6 As shown, click the Noise Automatic Measurement tab to measure the noise of different categories of codes, save the noise report, and repeat the process until the noise measurement of all data sources is completed.
[0051] like Figure 7As shown, click the Report Management tab, select the storage directory and output directory for the noise measurement report, and click Merge Report to generate a composite report of all noise data sources and different noise measurement codes.
[0052] In an application example, the present disclosure uses the measurement steps to complete the noise extraction of 300 defect-free heat transfer tube data, and obtains noise samples of different areas of the target steam generator heat transfer tube. By analyzing and processing the data, the background noise distribution of different areas of the heat transfer tube is given. The noise analysis results of different positions of the heat transfer tube are described in detail below. Taking the free section results of the straight tube area as an example, there are a total of 21,446 noise samples in the free section of the straight tube area. All noise samples are imported into statistical software for data analysis. The distribution of the noise samples is shown in Table 2 and Table 3. Figure 8 and Fig. 9 shown.
[0053] Table 2 Statistics of noise samples analysis in the free section of the straight pipe area
[0054]
[0055]
[0056]
[0057] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.
Claims
1. A method for automatically measuring the signal-to-noise ratio of an in-service heat transfer tube of a steam generator, characterized in that: The method comprises: Import the original data group, read the setting parameters and analysis report; Set the measurement category code of the eddy current noise of the steam generator heat transfer tube for each group of raw data and make corrections; Select the defect-free pipe data corresponding to each category code, verify the positioning and start the analysis; Set the parameters for heat transfer tube noise measurement and evaluation; Measure the noise of different categories of codes for each heat transfer tube and save the noise report until the noise measurement of all data sources is completed; Merge Report to generate a composite report of all noise data sources with different noise measurement codes.
2. The method according to claim 1, characterized in that Category codes include: FHL is used to indicate the free section of the hot end; FCL is used for the free section of the cold end; FUB is used for the free section of the bent tube; SCH is used for the center of the hot end support plate; SCC is used for the center of the cold end support plate; SEHU is used for the upper edge of the hot end support plate; SEHL is used for the lower edge of the hot end support plate; SECU is used for the upper edge of the cold end support plate; SECL is used for the lower edge of the cold end support plate; VSC is used for vibration damping strips; TTH is used for the upper edge of the hot end tube sheet; TTC is used for the upper edge of the cold end tube sheet.
3. The method according to claim 2, characterized in that For category codes FCL, FHL and FUB, the full length of the free section of the heat transfer tube eddy current data collected by the bobbin probe is measured, using a dynamic measurement window with a default window width of 15.24mm and a default step length of 15.24mm. Adjacent windows do not need to be measured overlappingly.
4. The method according to claim 2, characterized in that: For category codes SECU, SECL, SEHU, and SEHL, a fixed measurement window is used for the noise measurement at the upper and lower edges of the TSP support structure, and the window width is 2 / 3 of the width of the entire support plate.
5. The method according to claim 2, characterized in that: For category codes SCC and SCH, the noise measurement at the center of the TSP support structure uses a fixed measurement window with a window width of 1 / 3 of the entire support plate width.
6. The method according to claim 2, characterized in that For category code VSC, for noise measurements with support structure width less than 12.7 mm, a single window across the support is selected for measurement, and the width of the AVB anti-vibration strip noise measurement window is the entire AVB width.
7. The method according to claim 2, characterized in that For category codes TTC and TTH, a dynamic measurement window is used in the tube sheet mud area. The window width is 12.7mm, the measurement starting point is TTS+6.35mm, the default step length is 12.7mm, and the noise measurement range of the mud area is determined by the mud height L.
8. The method according to claim 1, characterized in that The noise measurements were performed using the following method: The main frequency analysis channel is selected in a specific area, and the maximum vertical component measurement method Vvm is used for noise measurement in all measurement channels.