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Application of Advanced Ultrasonic Technology to Measure Internal Deposit Thickness for Boiler Waterwall Tubes in Thermal Power Plants

[+] Author Affiliations
Yukio Imaizumi, Mitsuhiro Sueyoshi, Toshihiko Furue

Kyushu Electric Power Company, Inc., Fukuoka, Japan

Shizuo Seto, Tatsuyuki Nagai

Non-Destructive Inspection Company, Ltd., Osaka, Japan

Hiroshi Yamamoto

Chiyoda Advanced Solutions Corporation, Yokohama, Japan

Kevin Hara

Aptech Engineering Services, Inc., Sunnyvale, CA

Paper No. PVP2004-2817, pp. 73-77; 5 pages
doi:10.1115/PVP2004-2817
From:
  • ASME/JSME 2004 Pressure Vessels and Piping Conference
  • Recent Advances in Nondestructive Evaluation Techniques for Material Science and Industries
  • San Diego, California, USA, July 25–29, 2004
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4679-2
  • Copyright © 2004 by ASME

abstract

Recently, it was required to investigate the distribution of scale deposits on the inner surface of boiler waterwall tubes in a thermal power plant, because the excess scale deposits are the major concerns causing a decline in thermal efficiency and damage by overheating. To avoid these problems tube sampling and metallurgical examinations are carried out and appropriate periods of chemical cleaning are determined. Under the circumstance non-destructive methods to measure the thickness of scale deposits have been needed. The ultrasonic method can be used to estimate the thickness of scale deposits by using the time difference from interface signal between base metal and deposit to the back surface signal of deposits, when the thickness is 100 micrometers or more. However, the thickness can’t be estimated when the thickness is up to 100 micrometers because these two signals are overlapped and superimposed. In this study advanced measurement technology by analyzing the superimposed waveform was developed. As the results of experiments, the thickness of scale deposits can be estimated with accuracy of 10 micrometers. Also this technology can be applied to evaluate the effect of chemical cleaning.

Copyright © 2004 by ASME

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