Failure Analysis on the Tube Explosion of Two-stage Superheater
CHEN Xiaoxiao
CONG Hongmei
GAO Hongji
Abstract：After running with load for 25 hours, the secondary superheater tube of boiler exploded, which made the tube thicker and the crack trumpet-shaped open. The analysis for a boiler secondary superheater tube explosion adopts detection modes of chemical component analysis, mechanical properties test and microstructure analysis. The results show that microstructure of the crack was elongated along the deformation direction, and microstructure of the tube was no significant change, but the outside surface of the tube was oxygenated and decarburized severely. Meanwhile the short crack along grain boundaries appeared in the surface. All that means the tube suffered from erosion of high temperature flue gas within a short time. High temperature superheated in a short time is the main reason for the failure of the superheater tube.
Keywords：superheatertube burstingfailure analysishigh temperatureover heating
Publication Date：2014-11-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：2( 46-47 )