In this paper results from a complex strength analysis of a autothermic reactor are presented. The analysis has been carried out with the Finite Element software ANSYS. Calculations using a geometrical model with the same complex structure as the real device require high computational expense. Therefore a method for simplifying the geometrical structure was developed [1]. Afterwards elastic calculations with the simplified three-dimensional model of the device were carried out. The applied static loads are pressure and a steady state temperature field. Considering the stress categorization route the admissibility of the loads was checked in structural parts of the evaporator. These parts accord idealized structures for which the major design by analyses rules can be applied.

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