Influence of furnace tube shapeon thermal strain of fire-tube boilers
2014
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]
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