TY - JOUR
TI - Thermomechanical finite element analysis of hot water boiler structure
AU - Živković Dragoljub S
AU - Milčić Dragan S
AU - Banić Milan S
AU - Milosavljević Pedja M
JN - Thermal Science
PY - 2012
VL - 16
IS - 12
SP - 387
EP - 398
PT - Article
AB - The paper presents an application of the Finite Elements Method for stress  and strain analysis of the hot water boiler structure. The aim of the  research was to investigate the influence of the boiler scale on the thermal  stresses and strains of the structure of hot water boilers. Results show that  maximum thermal stresses appear in the zone of the pipe carrying wall of the  first reversing chamber. This indicates that the most critical part of the  boiler are weld spots of the smoke pipes and pipe carrying plate, which in  the case of significant scale deposits can lead to cracks in the welds and  water leakage from the boiler. The nonlinear effects were taken into account  by defining the bilinear isotropic hardening model for all boiler elements.  Temperature dependency was defined for all relevant material properties, i.  e. isotropic coefficient of thermal expansion, Young’s modulus, and isotropic  thermal conductivity. The verification of the FEA model was performed by  comparing the measured deformations of the hot water boiler with the  simulation results. As a reference object, a Viessmann - Vitomax 200 HW  boiler was used, with the installed power of 18.2 MW. CAD modeling was done  within the Autodesk Inventor, and stress and strain analysis was performed in  the ANSYS Software.