Abstract

The paper presents results of using continuous beam analytical differential equation method to dynamics behavior design of complex heat transfer orthotropic platens which are used in the recovery boilers. The goal is to obtain a predictive model for increasing the reliable useful operation time. The platens are supported vertically with fixed ends. They are loaded by hot flue gas and by accumulating mass loads due to operation conditions. The loads cause alternating stresses fracturing tube branch connections. The beam deflection and bending stress histories at the junction of tube and chamber are obtained using an analytical beam model. The model gives the lowest eigenfrequency close to the measured value which is somewhat larger than that obtained by FEM model. The beam model can be used for further optimal redesign of the tube branch connections and the mean time to failure of the process equipment.

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