Mechanical Model and Calculation of Dry Masonry Brick Lining of Blast Furnace Hearth

Abstract

According to the principle of thermo elasticity, thermal expansion mechanical characteristics of the dry masonry brick lining of the blast furnace hearth is analyzed, and the thermo elasticity multi-contact state non-linear model of brick lining is established. Based on finite element analysis, thermo-elastic mechanics calculation process and parameterization program are designed, and the feasibility of the algorithm and the program is verified. On the basis of analysis, rather than the brick joint of the hot end which can be closed completely, that of the cold end cannot always be closed when the dry masonry brick lining is heated. The closing length of brick joint near the cold end decreases when the wideness of reservation paving seam increases or linear expansion coefficient of brick decreases. Circumferential stress on the hot end of the brick lining and shell decreases with the increase of reservation brick joint. For ensuring the stability, hermetic sealing, reservation brick joint should be controlled strictly. When the plastic compression of filler exists, the closing length of brick joint is shorter, and the stress on the hot end of brick lining and shell is reduced. For the purpose of its strength and density, the amount of downward reduction of filler in building should increase property to ensure the strength and the density of filler, thus the hermetic sealing can be up to the standard. The internal pressure makes the closing segment of brick joint shorter. The stress of the shell increases when compressive stress on the hot end of brick lining decreases. Considering the hermetic sealing, stress of brick lining, stress of shell and other factors, the model and the parametric calculation program can also be applied to assessment and optimized design of structure parameters and material properties of the hearth.