The Research Of Several Issues Of Blast Furnace Hearth Erosion’s Numerical Calculation

Blast furnace is the significant equipment of ironmaking, which needs huge cost of building and maintenance. The blast furnace’s longevity can improve the economic efficiency of enterprises, which has great significance, so, prolonging blast furnace’s lifetime as long as possible is the tireless pursuit goal for national BF workers. Blast furnace hearth and bottom lining of the erosion is the major decision factor to blast life after the blast service, and there is a guiding significance for production decisions that monitoring hearth bottom erosion of the blast furnace.At present, the common erosion models of BF hearth lining are one-dimensional and two-dimensional erosion model. Three-dimensional erosion model can’t be applied because of it’s large computation. Based on the analysis and research of the blast furnace lining erosion prediction, this paper boils the analysis model down to a problem of two-dimensional steady-state axisymmetric heat transfer and uses the finite element method to analyze computing. The main work is as follows:(1)Using Matlab and Visual C++mixed programming, call the part of the Matlab library function, according to the actual characteristics of the blast furnace lining erosion morphology, proposed and implemented a Delaunay triangulation algorithm based on convex and concave polygons, and then achieved the blast furnace shaft cross-section area of discrete.(2)Established liner two-dimensional erosion model, according to given temperature data, calculate and get the1150℃continuous isotherm, and then by the interpolatory subdivision of discrete unit, smooth contour, temperature cloud pictures to draw and so on methods, achieved visual display of blast furnace liner’s two-dimensional temperature field.(3) This paper structures the process and key algorithm of hearth lining erosion surface reconstruction, which is based on NURBS, according to the characteristics of the two-dimensional erosion of the boundary, achieve display of three-dimensional surface of the hearth liner erosion by using OpenGL.The above algorithm is used the C++to write code to generate a stand-alone executable file. It can be completely divorced from the commercial software (eg Matlab, Ansys) environment. And temperature field visualization and curve and surface reconstruction technology is applied to analysis and system development of some blast furnace hearth lining erosion state, it formed a dedicated system. It verified the algorithm stability, validity and reliability in the production practice.