Thermal Science 2012 Volume 16, Issue suppl. 2, Pages: 387-398
https://doi.org/10.2298/TSCI120503177Z
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Thermomechanical finite element analysis of hot water boiler structure
Živković Dragoljub S. (Faculty of Mechanical Engineering, Niš)
Milčić Dragan S. (Faculty of Mechanical Engineering, Niš)
Banić Milan S. (Faculty of Mechanical Engineering, Niš)
Milosavljević Peđa M. (Faculty of Mechanical Engineering, Niš)
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.
Keywords: thermomechanical analysis, hot water three-pass fire tube boiler, finite elements analysis