Analysis of superheater tubes failure

Abstract

Failures of boiler pressure parts, which working in high temperature and pressure conditions are often caused by overheating or corrosion. These two parameters are decisive, but not the only ones. Local stress concentration also depends on the type of headers support and external loads from pipelines. Boiler pressure parts subjected to all loads mentioned before are steam superheaters. Thermal expansion, high pressure and temperature lead to shortening superheaters lifetime. In the places with significant stress caused by all load combinations it is difficult to predict creep strains and material structure changes. This paper shows superheater in which considering external loads from pipeline and their influence on the stress concentration in the superheater tubes. This article also shows steel S304H creep analysis for 100k [h] results and creep equation with experimental developed constants.

An Analysis of a Reheater Failure and a Proposal to Upgrade the Device Design

“…Boiler installations built in the 1990's are more and more often operated under a higher risk of damage to pressure elements. Due to the time of to-date service, and the large number of shutdowns and start-ups, the number of failures has been on the rise annually [1][2][3][4].…”

“…To predict fatigue life under different experimental conditions, various conventional life-prediction models are evaluated and discussed [2]. Thermal expansion, high pressure, and temperature also shorten the life of reheaters and superheaters [3].…”