Multi-dimensional Mathematical Model of Blast Furnace Based on Multi-fluid Theory and Its Application to Develop Super-high Efficiency Operations

This paper mainly emphasizes development of a multifluid blast furnace model and its application to simulate several innovative ironmaking operations. At first, the development process and framework of the model are briefly introduced. Then, model simulations on hydrogen bearer injection show that the enhancement of hydrogen reduction brings the improvement of furnace performance, especially for injection of natural gas and plastics. Total heat input shows obvious decrease due to the decrease in direct reduction, solution loss and Si transfer reactions. Also, another simulation shows that if carbon composite agglomerates are charged in the furnace thermal reserve zone temperature will obviously decrease, and the reduction of iron-bearing raw materials will be retarded. However, the efficiency of blast furnace is improved due to the decrease in heat requirements for solution loss, sinter reduction and silicon transfer reactions, and less heat outflow by top gas and wall heat loss. The third application is to investigate the performance of blast furnace under top gas recycling together with plastics injection, cold oxygen blasting and carbon composite agglomerates charging. The model predicted lower infurnace temperature, extremely accelerated reduction speed, drastically decreased carbon emission and remarkably enhanced heat efficiency. Thus, the blast furnace operation with super high efficiency can be achieved through the practical applications of these innovative technologies.