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JSIR Vol.68(01) [January 2009] >


Title: Boiler tube failures (BTFs) in natural circulation high pressure drum boiler of a power station
Authors: Sohail, M Azad
Mustafa, A Ismail
Gafur, M Abdul
Keywords: BTFs
Boiler
Hydrogen damage
Regime
Water wall tubes
Issue Date: Jan-2009
Publisher: CSIR
Abstract: This paper assesses boiler tube failures (BTFs), especially in boiler water wall tubes (BWWTs) for a natural circulation high-pressure fossil (natural gas) drum boiler unit (TIME-COB-206, Russia). Metallographic (micro and macrostructural) examinations of BWWTs materials (carbon steel, Russia) were carried out extensively. Analyses of carbon (mild) steels (0.22% C) revealed distinctive changes in ferrite-pearlite distribution, might be due to decarburization. Huge pits, few grooves followed by flow lines were observed on internal surfaces of BWWTs with respect to length of power plant operation. Corrosions or scaling in BWWTs depicted one of the major causes of BTFs in fossil units with drum boilers usually treated by coordinated phosphates.
Page(s): 61-65
ISSN: 0022-4456
Source:JSIR Vol.68(01) [January 2009]

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