Thermal Science 2010 Volume 14, Issue suppl., Pages: 313-321
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Assessment of the drum remaining lifetime in thermal power plant
Živković Miroslav M., Vulović Snežana D., Vujanac Rodoljub S.
In this paper analysis of stress and thermal-elastic-plastic strain of the drum is performed. Influence of modified thickness, yield stress and finite element model of welded joint between pipe and drum on assessment of the remaining lifetime of the drum in the thermal power plant is analyzed. Two analyses are compared. In the first, drum is modeled by shell and by 3D finite elements with projected geometrical and material data of drum. Then, the drum is modeled by shell and by 3D finite elements with modified thickness and yield stress. The analysis show that detailed modeling of stress concentration zones is necessary. Adequate modeling gives lower maximal effective plastic strain and increased number of cycles and, in that case, 3D finite elements are better comparing to shell finite elements.
Keywords: boiler drum, plastic strain, life time, finite element method