Comprehensive Inspection Solution for Boiler Water Wall Tube Corrosion

被引：0

作者：

Lee, Ping Hung ^{[1
]}

Ma, Pei Hua ^{[1
]}

Owens, Steve ^{[2
]}

Borigo, Cody ^{[2
]}

机构：

[1] Guided Wave Ltd, Chinese Taipei, Kaohsiung, Taiwan

[2] Guidedwave (FBS, Inc. d.b.a.), PA, United States

来源：

e-Journal of Nondestructive Testing | 2024年 / 29卷 / 06期

关键词：

A substantial number of domestic coal-fired boilers; most of which have been in operation for numerous years; are susceptible to corrosion and tube ruptures within their high-temperature environment; often resulting in unplanned shutdowns. Despite the annual planned maintenance shutdowns; which involve routine inspections of water wall and furnace tubes to detect potential corrosion and erosion; the current non-destructive testing methods are generally localized. This approach; particularly with the considerable height variation of the water wall tubes (ranging from approximately 10 to 25 meters); may overlook segments with severe corrosion during localized ultrasonic thickness gauging. Although the experience of inspection teams reduces the chance of defect oversight; the demand for a comprehensive and effective inspection technique remains a priority for boiler operators. This study utilizes the characteristic of guided waves to propagate over a certain distance along pipelines; initiating an exploration into a comprehensive inspection solution for water wall tubes. Finite element simulation results demonstrate the suitability of utilizing a 120 kHz frequency for shear horizontal mode (SH0) testing on the fire side of water wall tubes. This mode effectively screens for localized corrosion within a 3-meter range. In the field of on-site boiler inspection; electromagnetic coils are employed to generate guided waves within water wall tubes. The gathered signals from each electromagnetic guided wave testing (EMGWT) are consolidated into a distribution map; indicating suspicious signal locations. Pulse eddy current testing (PECT) is employed to identify potential issues with guided waves without requiring surface preparation. If PECT reveals anomalies; the affected surface is polished; and phased array ultrasonic testing (PAUT) is conducted to quantitatively measure the remaining wall thickness due to corrosion. The theoretical exploration and on-site inspection outcomes affirm the feasibility of this approach; aimed at enhancing operational safety for boiler water wall tubes and mitigating the risks of tube ruptures and leaks. This comprehensive inspection solution amalgamates three advanced detection technologies; each capitalizing on its unique inspection characteristics to facilitate corrosion screening; corrosion scanning; and wall thickness sizing. Through the integration of these technologies; the overall inspection strategy ensures the utmost level of reliability. © 2024 The Authors;

D O I：

10.58286/29920

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