Failure analysis of a superheater tube of a coal-fired power plant
Failure analysis of structures has gained a considerable interest in many engineering areas. The aim of this research is to determine the root cause of the structural failures which can reduce the failure risks and prevent similar failures in the future. This thesis presents experimental inves...
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2008
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my-uthm-ep.71182022-06-08T02:09:55Z Failure analysis of a superheater tube of a coal-fired power plant 2008-06 Piedade, Salustiano Dos Reis TJ Mechanical engineering and machinery TJ268-740 Steam engineering Failure analysis of structures has gained a considerable interest in many engineering areas. The aim of this research is to determine the root cause of the structural failures which can reduce the failure risks and prevent similar failures in the future. This thesis presents experimental investigations for the failure of a superheater tube of a coal-fired power plant using several failure analysis procedures. The failure analysis comprised of visual inspection, optical microscopic, scanning electron microscopy combined with the energy dispersive X-ray spectroscopy (EDS) and energy dispersive X-ray diffraction (EDXD). A sample of a total-fractured superheater tube obtained from an industry was used in this investigation. Initial visual investigations found that the superheater tube had a longitudinal crack. This fracture appearance is called fish mouth stress rupture. The specimen was initially cut, mounted, grinded, polished and etched. A significant oxide layer of 1.75mm in thickness was occurred in the steam side surface. The optical microscopy and scanning electron microscopy were used to identify intergranular cracks, voids, elongated grain and deposit layers. The EDS and EDXD were used to identify types and compositions of the oxide substances. The results revealed that the steam and fire side surfaces consist of sodium iron oxide, hematite and magnetite. The study also demonstrates that the superheater tube of a coal-fired failed due to creep mechanism. This resulted in overheating problem inside the tube; caused by deposit layers, which contributes to the creep mechanism. Periodically cleaning and maintenance should be done in order to avoid accumulation of deposit layers. 2008-06 Thesis http://eprints.uthm.edu.my/7118/ http://eprints.uthm.edu.my/7118/1/24p%20SALUSTIANO%20DOS%20REIS%20PIEDADE.pdf text en public http://eprints.uthm.edu.my/7118/3/SALUSTIANO%20DOS%20REIS%20PIEDADE%20COPYRIGHT%20DECLARATION%20.pdf text en staffonly http://eprints.uthm.edu.my/7118/2/SALUSTIANO%20DOS%20REIS%20PIEDADE%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan |
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Universiti Tun Hussein Onn Malaysia |
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UTHM Institutional Repository |
language |
English English English |
topic |
TJ Mechanical engineering and machinery TJ268-740 Steam engineering |
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TJ Mechanical engineering and machinery TJ268-740 Steam engineering Piedade, Salustiano Dos Reis Failure analysis of a superheater tube of a coal-fired power plant |
description |
Failure analysis of structures has gained a considerable interest in many engineering
areas. The aim of this research is to determine the root cause of the structural failures
which can reduce the failure risks and prevent similar failures in the future. This
thesis presents experimental investigations for the failure of a superheater tube of a
coal-fired power plant using several failure analysis procedures. The failure analysis
comprised of visual inspection, optical microscopic, scanning electron microscopy
combined with the energy dispersive X-ray spectroscopy (EDS) and energy
dispersive X-ray diffraction (EDXD). A sample of a total-fractured superheater tube
obtained from an industry was used in this investigation. Initial visual investigations
found that the superheater tube had a longitudinal crack. This fracture appearance is
called fish mouth stress rupture. The specimen was initially cut, mounted, grinded,
polished and etched. A significant oxide layer of 1.75mm in thickness was occurred
in the steam side surface. The optical microscopy and scanning electron microscopy
were used to identify intergranular cracks, voids, elongated grain and deposit layers.
The EDS and EDXD were used to identify types and compositions of the oxide
substances. The results revealed that the steam and fire side surfaces consist of
sodium iron oxide, hematite and magnetite. The study also demonstrates that the
superheater tube of a coal-fired failed due to creep mechanism. This resulted in
overheating problem inside the tube; caused by deposit layers, which contributes to
the creep mechanism. Periodically cleaning and maintenance should be done in order
to avoid accumulation of deposit layers. |
format |
Thesis |
qualification_name |
Master of Philosophy (M.Phil.) |
qualification_level |
Master's degree |
author |
Piedade, Salustiano Dos Reis |
author_facet |
Piedade, Salustiano Dos Reis |
author_sort |
Piedade, Salustiano Dos Reis |
title |
Failure analysis of a superheater tube of a coal-fired power plant |
title_short |
Failure analysis of a superheater tube of a coal-fired power plant |
title_full |
Failure analysis of a superheater tube of a coal-fired power plant |
title_fullStr |
Failure analysis of a superheater tube of a coal-fired power plant |
title_full_unstemmed |
Failure analysis of a superheater tube of a coal-fired power plant |
title_sort |
failure analysis of a superheater tube of a coal-fired power plant |
granting_institution |
Universiti Tun Hussein Onn Malaysia |
granting_department |
Fakulti Kejuruteraan Mekanikal dan Pembuatan |
publishDate |
2008 |
url |
http://eprints.uthm.edu.my/7118/1/24p%20SALUSTIANO%20DOS%20REIS%20PIEDADE.pdf http://eprints.uthm.edu.my/7118/3/SALUSTIANO%20DOS%20REIS%20PIEDADE%20COPYRIGHT%20DECLARATION%20.pdf http://eprints.uthm.edu.my/7118/2/SALUSTIANO%20DOS%20REIS%20PIEDADE%20WATERMARK.pdf |
_version_ |
1747831115152883712 |