关键词: 炼钢转炉, 水模型, 渣金边界, 织构分维数

Abstract: Based on the law of similarity, a top-blowing converter is simulated with water modeling. A digital camera is used to take pictures. Digital image processing is carried out with computer. The length of slag metal boundary in a top-blowing steelmaking converter is experimentally studied with fractal dimension theory, aiming to examine its variation with blowing parameters. The textural fractal dimensions and dimensionless length of the slag metal boundary are calculated from the mixing images under various blowing conditions. The result shows that the lance position, gas flowrate and slag quantity have great influence on the transition of texture fractal. Furthermore, gas flowrate is primary factor. Experimental relationships between the transition textural fractal dimension and the blowing parameters are obtained. Empirical formulae for calculating the dimensionless length and fractal dimension are discussed. The experiment proves that textural fractal dimension is important basis for estimating dimensionless length of the slag metal boundary. The fractal theory is one of effective ways used to quantitatively calculate the slag metal boundary.

Key words: steelmaking converter, water model, slag-metal boundary, textural fractal dimension