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Economizer water-wall damages initiated by feedwater impurities

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Authors
Vidojković, Sonja
Onjia, Antonije E.
Devečerski, Aleksandar B.
Grahovac, Nebojsa N
Nastasović, Aleksandra
Article (Published version)
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Abstract
The main causes of efficiency loss in thermal power plants are boiler tube failures that diminish unit reliability and availability, and raise the cost of the electric energy. For that reason, the regular examination of boiler tubes is indispensable measure for prevention of future malfunctions of power units. The microscopic examination of economizer's inner wall microstructure, the analysis of chemical composition of deposit using X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) have been performed in a subcritical power plant. Stress corrosion cracking, pitting corrosion, destroyed protective magnetite layer, presence of magnetite and hematite in deposit and corrosive impurities within the cracks have indicated the effect of inadequate quality of feedwater that cannot entirely ensure reliable operation of the boiler. It may be stated that maintenance of present boiler does not provide its reliable operation. The extensive chemical con...trol of water/steam cycle was recommended.

Keywords:
boiler tube / deposition / corrosion / feedwater impurities
Source:
Hemijska industrija, 2014, 68, 5, 559-563
Publisher:
  • Association of Chemical Engineers of Serbia
Projects:
  • Advanced technologies for monitoring and environmental protection from chemical pollutants and radiation burden (RS-43009)
  • Synthesis, processing and characterization of nanostructured materials for application in the field of energy, mechanical engineering, environmental protection and biomedicine (RS-45012)

DOI: 10.2298/HEMIND130715082V

ISSN: 0367-598X

WoS: 000346394000005

Scopus: 2-s2.0-84922682555
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/1474
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