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The aim of this paper is to use numerical analysis and fine element   method-FEM to investigate the influence of furnace tube shape on the thermal   strain of fire-tube boilers. Thermal stresses in corrugated furnace tubes of   different shape, i.e. with different corrugation pitch and depth, were   analysed first. It was demonstrated that the thermal stresses in corrugated   furnace tube are significantly reduced with the increase of corrugation   depth. Than deformations and stresses in the structure of a fire-tube boiler   were analysed in a real operating condition, for the cases of installed plain   furnace tube and corrugated furnace tubes with different shapes. It was   concluded that in this fire-tube boiler, which is of larger steam capacity,   the corrugated furnace tube must be installed, as well as that the maximal   stress in the construction is reduced by the installation of the furnace tube   with greater corrugation depth. The analysis of stresses due to pressure and   thermal loads pointed out that thermal stresses are not lower-order stresses   in comparison to stresses due to pressure loads, so they must be taken into   consideration for boiler strength analysis. [Projekat Ministarstva nauke   Republike Srbije, br. TR 35040 i br. TR 35011

Influence of furnace tube shapeon thermal strain of fire-tube boilers