Analysis on Tube Burst of High Temperature Superheater in a Power Plant Boiler
For a tube burst accident occurred at a high temperature superheater in a power plant boiler,to avoid the similar accidents,the reason of tube burst was investigated from the aspects of macroscopic inspection,alloy composition analysis,hardness test,metallographic inspection,and energy spectrum analysis through using alloy analyzer,Brinell hardness tester,metallographic microscope,and scanning electron microscope(SEM).Results show that,the reason of the tube burst is the thick corrosion products attached to the inner wall of the tube,which leads to the decrease of flow area and the deterioration of heat transfer with the long time over temperature service of boiler tube.In response to this issue,it is necessary to strengthen the management of the construction and installation process of boiler heating surface tubes in power plants.Measures such as sealing the tube leak and strengthening the wall temperature monitoring during operation should be adopted,thereby improving the reliability of boiler operation.
boilerhigh temperature superheatertube burstlong time over temperature
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