DETERMINATION OF THE CRITICAL POSITION DURING THE ASSEMBLY OF THE BOILER HEAT EXCHANGER PACKAGE DUE TO THE STRESSES OF THE AUXILIARY FRAME STRUCTURE

Construction of the Thermal power plant boiler is usually large in size and weight. The aim of the production is to deliver the boiler assemblies on the construction site with maximal dimensions. This depends on the possibilities of transport and assembly. For such large and sensitive parts of the boiler structure it is necessary to carefully plan the mode of transportation and assembly. Very often it is necessary to create auxiliary structures which will stiffen the boiler component, so that it prevents damage and permanent deformation during the lift and assembly. In this paper will be analyzed strength of the auxiliary frame structure for lifting and rotating transport unit of the boiler heat exchanger package Tampere, during the rotation. Assembly unit is rotated from horizontal to vertical position. Rotation leads to changes in the amount and direction of load of the auxiliary frame structure. Aim will be to determine the critical position of the assembly unit, in which will occur maximal stress on the auxiliary framework structure. Stress calculations of the auxiliary frame structure will be made using the finite element method and beam finite element. Five different positions of the assembly unit will be analyzed; 0 °, 30°, 45°, 60° and 90°.