Author(s)

H. Martikka, I. Pöllänen & J. Simonen

Abstract

The objects of study are recovery boilers. They are essential parts in the paper processing industry for burning chemicals into a more ecological form and for obtaining steam. One goal in the design of recovery boilers is to reduce the risks and consequences of water to melt explosion and the risk of inflammable gas explosions. The walls are orthotropic tubular laminates. One method to reduce risk is to improve local geometry and welding. Another is to consider the total structure and vent out the pressure peaks of explosion to the outside. Analytical optimum design methods using theory of orthotropic plates are used to obtain optimal ranges of main design variables and their physical effect on total reliability. The FEM program MSC Nastran is used to calculate in detail the elastic-plastic responses. The results show that damage risk can be minimised by redesigning critical joint areas and using optimally stiffeners. Keywords: protection of structures, blast loads, composite shells. 1 Introduction Recovery boilers are essential parts in paper processing industry for burning chemicals into more ecological form and for obtaining steam. One goal in design of recovery boilers is to consider risks and consequences of water to steam explosion and risk of inflammable gas explosion. Risk situations are controlled

Keywords

protection of structures, blast loads, composite shells.