A process model for BOF process based on bath mixing degree

Abstract

The process model for BOF process can be applied to predict the liquid steel composition and bath temperature during the whole steelmaking process. On the basis of the traditional three-stage decarburization theory, the concept of mixing degree was put forward, which was used to indicate the effect of oxygen jet on decarburization. Furthermore, a more practical process model for BOF steelmaking was developed by analyzing the effect of silicon, manganese, oxygen injection rate, oxygen lance height, and bath temperature on decarburization. Process verification and end-point verification for the process model have been carried out, and the verification results show that the prediction accuracy of carbon content reaches 82.6% (the range of carbon content at the end-point is less than 0.1wt%) and 85.7% (the range of carbon content at end-point is 0.1wt%-0.7wt%) when the absolute error is less than 0.02wt% and 0.05wt%, respectively.

Numerical Simulation of Decarburization in a Top-Blown Basic Oxygen Furnace

“…Finally, as reported in [2] and [16], the decarburization rate decreases as the lance height is increased, as is observed in Figure 9.…”

“…When the lance is too high, the rate of carbon removal is reduced and erratic; besides, the slag will be over-oxidized and higher iron losses occur by oxidation. When the lance is too low, the carbon removal is increased [16] and the oxidation losses are reduced. However, there is a correct lance height, and it depends on the furnace and lance design and the oxygen flow rate [2].…”

Influence of Ultrafast Cooling on Microstructure and Mechanical Properties of Steel

“…Three subsurface thermocouples at various locations of the test plate were arranged parallel to the quench surface to measure the transient temperature data during cooling. The methodology of the thermocouple arrangement has been proposed by the Li and Wells that to eliminate the error induced by the hole diameter. The schematic diagram of the test specimen with thermocouple location is shown in Figure .…”

Physical and Mathematical Modeling of Multiphase Flows in a Converter

“…[49][50][51][52][53][54][55][56][57][58] Therefore, this paper will review the developments in physical modeling and computational simulations of the fluid flow behavior in BOF steelmaking process. Details of fundamental modeling methods, supersonic oxygen jet behavior, stirring and mixing characteristics in the bath, splashing and droplet generation behavior and energy transfer performance will be presented, and finally outlook and future trends will also be discussed.…”