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International Journal of Corrosion
Volume 2017, Article ID 7367046, 8 pages
https://doi.org/10.1155/2017/7367046
Research Article

Fire-Side Corrosion: A Case Study of Failed Tubes of a Fossil Fuel Boiler

1School of Chemistry, The University of New South Wales, Sydney, NSW, Australia
2Chemistry and Materials Research Centre, Niroo Research Institute (NRI), Tehran, Iran
3Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran

Correspondence should be addressed to Majid Asnavandi; ua.ude.wsnu@idnavansa.m

Received 31 August 2016; Accepted 7 December 2016; Published 15 January 2017

Academic Editor: Yu Zuo

Copyright © 2017 Majid Asnavandi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The failures of superheater and reheater boiler tubes operating in a power plant utilizing natural gas or mazut as a fuel have been analysed and the fire-side corrosion has been suggested as the main reason for the failure in boiler tubes. The tubes have been provided by a fossil fuel power plant in Iran and optical and electron microscopy investigations have been performed on the tubes as well as the corrosion products on their surfaces. The results showed that the thickness of the failed tubes is not uniform which suggests that fire-side corrosion has happened on the tubes. Fire-side corrosion is caused by the reaction of combustion products with oxide layers on the tube surface resulting in metal loss and consequently tubes fracture. However, the tubes corrosion behaviour did not follow the conventional models of the fire-side corrosion. Given that, using the corrosion monitoring techniques for these boiler tubes seems essential. As a result, the thickness of the boiler tubes in different parts of the boiler has been recorded and critical points are selected accordingly. Such critical points are selected for installation of corrosion monitoring probes.