지역난방 첨두부하보일러 대류부 부식 파손 분석
Corrosion Failure Analysis of the Convection Part of District Heating Peak Load Boiler
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초록
Corrosion failure in the convection part of peak load boiler (PLB) of the district heating system led towater leakage. Herein, Internal Rotary Inspection System (IRIS) inspection was employed to examine wallthinning and the cause of leakage in the flue tube. The corrosive products of the turbulator and tube wereinvestigated using scanning electron microscope combined with energy dispersive spectroscopy, X-raydiffraction, and inductively coupled plasma (ICP). Majority of the serious corrosion damage was observednear the turbulator located in the upper flue tube. ICP analysis of the boiler water revealed oxide formationof sodium chloride in the lower end part of the flue tube. A cross-sectional view of the turbulator revealedthe presence of double-layers of the oxide film, indicating environmental change during operation associatedwith water leakage. The outer surface of the turbulator consisted of the acid oxides such as NOx and SOxalong with sodium and chloride ions. Dew-point corrosion is hypothesized as the main cause for the formationof acid oxides in the region of contact of the flue tube and the turbulator.
Abstract
Corrosion failure in the convection part of peak load boiler (PLB) of the district heating system led towater leakage. Herein, Internal Rotary Inspection System (IRIS) inspection was employed to examine wallthinning and the cause of leakage in the flue tube. The corrosive products of the turbulator and tube wereinvestigated using scanning electron microscope combined with energy dispersive spectroscopy, X-raydiffraction, and inductively coupled plasma (ICP). Majority of the serious corrosion damage was observednear the turbulator located in the upper flue tube. ICP analysis of the boiler water revealed oxide formationof sodium chloride in the lower end part of the flue tube. A cross-sectional view of the turbulator revealedthe presence of double-layers of the oxide film, indicating environmental change during operation associatedwith water leakage. The outer surface of the turbulator consisted of the acid oxides such as NOx and SOxalong with sodium and chloride ions. Dew-point corrosion is hypothesized as the main cause for the formationof acid oxides in the region of contact of the flue tube and the turbulator.
참고문헌 (7)
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- ASME, "Boiler & Pressure Vessel CodeⅠ Part PWT Requirements for Water Tube Boilers", 119~121 (2007)
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