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.
Highlights
Many boiler pressure part damages were caused by unpredictable working conditions, e.g. material overheating, corrosion and erosion
Steel 18Cr-9Ni-3Cu-Nb-N, X10-Cr-Ni-Cu-Nb-18-9-3 known as S304H is the material for steam superheater due to its good strength properties [4]
The article presents the impact of the steam pipeline on the superheater, in which concentration of stress occurred in the tubes with high pressure and temperature
Summary
Many boiler pressure part damages were caused by unpredictable working conditions, e.g. material overheating, corrosion and erosion. These elements of boiler are characterized by work in high pressure and temperature parameters They are subjected to external loads from pipelines, which affect their lifetime shortening. Pipeline working conditions should be examined to avoid any other tensions in superheaters area Neglecting these works can cause additional loads in coils and headers, often larger than in design phase. In this paper it will be shown analysis of the pipeline system affecting the superheater, influence of external forces on stress concentration in superheater tubes and creep analysis results for material S304H after 100,000h working time. For this purpose, the paper will propose a creep equation whose constants have been determined experimentally [3]
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