Elastoplastic Analysis Of Large Blast Furnace Shell

The force and deformation analysis of blast furnace shell is made in this paper, which based on the finite element software ADINA, and it includes two parts: the elastic analysis and the elastoplastic analysis.Firstly, the paper reviews the history and present situation of blast furnace shell research, proposes the necessity of using analysis design method, and it gives a brief introduction of the finite element method, theory of plates and shells and the shell elements involved. Secondly, the paper introduces the processes of blast furnace shell modeling and the factors considered. Then the paper puts its emphasis on the elastic and the elastoplastic analyses of the blast furnace shell. In this part, it not only obtains the force and deformation of each section of the blast furnace, but also analyses the influence of three factors: the reduction thickness of the cooling holes, the value of the strain hardening modulus and the loading paths. It gets some changing laws and gives some useful conclusions.The results show that:①The maximum stress and deformation of the blast furnace shell appear at the hearth. And force of the blast furnace shell can be divided into two directions: horizontal and vertical, in which loop tensile stress dominants.②During elastoplastic analysis, a two polygonal line model with the strain hardening modulus can be used as material stress-strain relation, and the strain hardening modulus is 2% of initial elastic strain. The stress, deformation and load of the blast furnace shell showed a linear relationship during elastic analysis, and it showed a two polygonal line relationship during elastoplastic analysis.③The influence of thickness reduction on stress and deformation is concentrated on the reduction area, and it has little influence on the lower area. When the opening ration of the cooling holes is less than 40%, the stress or deformation after the reduction expresses a reciprocal relation to the original ones. So the introduction of the thickness reduces which is used to consider the cooling hole is necessary. When the opening ration of the cooling holes is less than 40%, 100%- opening ration can be used to represent the reduction rate.④When load is invariant, the increasing of the strain hardening modulus will lead to the decreasing of deformation, the increasing of stress, and the decreasing of plastic area.⑤Loading path has little influence on the stress and deformation of the blast furnace shell.This paper is one of the few researches which use ADINA for the analysis of the whole blast furnace shell. It can provide theoretical basis for the code for smelting process furnace technique. And it can comprise with similar researches which using other software, and also can give some useful reference to local analysis of blast furnace shell and engineering design.