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In the blast furnace smelting process, the pulverized coal digestibility of the tuyere is an important indicator for studying the combustion status of tuyere. It is the basis for decision making and improvement of pulverized coal injection ratio. A correct and effective assessment is of great significance. In this paper, a fuzzy comprehensive evaluation model based on the fusion of subjective and objective evidence is proposed, which integrates the pulverized coal burnout rate, temperature gradient, combustion zone activity, and uniformity. Pulverized coal burnout rate in the raceway is calculated by the mathematical model. The temperature gradient is obtained by digitizing the tuyere image. The activity and uniformity of the combustion zone are defined by the required temperature for the active state of the blast furnace hearth and average temperature, respectively. Through the expert knowledge and principal component analysis to determine the weights of various indicators, a more accurate and comprehensive model of the pulverized coal digestibility of the raceway in the blast furnace is constructed. The evaluation model is applied to make the application analysis of actual blast furnace off-line data, and the evaluation results are consistent with the actual operation data analysis.

isij international

Fuzzy Comprehensive Evaluation Model of Pulverized Coal Digestibility in Blast Furnace Raceway Based on the Fusion of Subjective and Objective Evidence