An Improved CBR Model Based on Mechanistic Model Similarity for Predicting End Phosphorus Content in Dephosphorization Converter

Abstract

There has been a lack of reliable online measuring equipment on end phosphorus content in dedicated dephosphorization converter, which leads to the low control accuracy of end phosphorus content. A Case-based Reasoning (CBR) method based on mechanistic model similarity is proposed to predict the end phosphorus content in dephosphorization converter. The correlation between the influencing factors and target as well as the similarity between influencing factors of different cases are considered comprehensively in the proposed method. Firstly, the mechanistic model of end phosphorus content in dephosphorization converter is established by using the slag phosphorus distribution ratio and Matter Conservation. Then, the similarity calculation equation of mechanistic model is designed. Lastly, the prediction result is obtained by bringing the mechanistic model of end phosphorus content into the designed similarity calculation method. CBR method based on mechanistic model similarity (CBR-MM), mechanistic model, Back Propagation Neural Network (BPNN), CBR based on Euclidean Distance similarity (CBR-ED), and CBR based on Grey Distance similarity (CBR-GD) are used to predict end phosphorus content by applying practical production data. The result shows CBR-MM has higher prediction accuracy compared to other methods.

Optimization of Endpoint Control for Low Carbon and Phosphorus Steel Produced by Converter Single Slag Process

“…The predecessors mainly studied the methods to improve the accuracy of endpoint composition and temperature prediction. [8][9][10][11] In this paper, the effect of press-lance time on endpoint C% and final slags FeO% were studied through experiments, and the control range and realization method of endpoint carbon in the production of low-carbon and phosphorus steel were proposed. Summarize the law of how the operation in the final phase of steelmaking affects furnace lining erosion, so as to optimize and improve the current operation, mitigate their effect on furnace lining erosion, and attain the goal of continuous production.…”