Furnace Wall 3D Stress Analysis Of Blast Furnace Hearth Shell Cracking

Blast furnace iron-making is now using one of the most common ways of iron-making in China. Blast furnace volume of each key iron and steel enterprises in our country are moving in the large-scale development, and now the industrial production and demand towards high yield and strengthening smelting of blast furnace. Improve productivity and reduce iron-making cost, and extend the service life of blast furnace has become an important problem urgently to be solved in the steel industry, the longevity of blast furnace iron-making technique progress is one of the important mark. Hearth is the core of the blast furnace structure security area, it is a hot metal container, and storage life of hearth furnace wall decides the life span of the blast furnace. The breakage of the refractory lining spalling and cracking furnace shell lining caused by damage is the main damage forms in hearth. The furnace shell crack problem has important practical significance.Based on the blast furnace hearth furnace wall structure as the research object, in view of the furnace shell cracking problem, based on APDL language in ANSYS finite element analysis software of parameterized lining & packing & cooling wall & packing & bof shell 5 of the layer 3 d model of the furnace wall structure. On this basis, according to the theory of steady-state heat conduction heat transfer, convection heat transfer theory, the reasonable determination of the cooling wall of the heat transfer coefficient, heat transfer coefficient of the outside of the furnace shell, such as boundary conditions. Using the ANSYS finite element simulation of the three-dimensional temperature field in a furnace wall, get interface temperature of furnace wall of different lining thickness of residual and crack length.Based on the theory of thermal stress of lining building, firing and normal working lining deformation analysis of masonry, the equivalent elastic modulus of lining masonry and the equivalent linear expansion coefficient.Established considering lining - cooling stave, the cooling wall-the sliding contact of the bof shell, furnace shell have craze of three-dimensional furnace wall thermal elastic-plastic mechanics model, using ANSYS thermal-structure coupling simulation function for furnace wall thermal stress calculation and analysis. Calculation and analysis of different lining thickness and the remaining furnace shell crack length, width, size of lining to stress the influence of the outer ring. The furnace shell possible elastoplastic deformation and crack tip stress concentration and the furnace shell cracking, the influence of the lining to the outer ring stress. Lined with three dimensional stress results and cracking furnace shell reinforcing plane axisymmetric two-dimensional theoretical calculation results of comparative analysis, on the one hand for mutual authentication, at the same time discussing plane axisymmetric two-dimensional theoretical calculation about the applicability of the furnace shell crack length.This topic research contents to improve the design and construction technology of blast furnace wall and offers reference value for maintenance of furnace hearth shell cracking.