Physical Modeling of Bottom-Blown Continuous Steelmaking, Part II: Development of Mass Transfer Correlations and Process Feasibility

摘要

One of the proposed flow sheets for 4e American Iron and Steel Institute Direct Steelmaking Project in-- eluded a continuous refiner. A method is developed for assessing the feasibility of a pilot scale refiner and a commercial scale refiner similar to that of an actual Q-BOP. In Part I,1 the process was described, water modeling results were presented, and a decarburization reaction model was verified for predicting the steady-state carbon content being tapped from the water model. IE (his paper, empirical mass | transfer correlations are developed to I extrapolate the water modeling results | to pilot and commercial bottom-blown I rifling processes. Initially, it is shown ta both the water model and the doctrinal vessels operate under perfect mixing conditions, and that k kinetic energy of the incoming gas Wes not significantly contribute to mix-This permitted the use of the decor model that assumes a per-mixed vessel. Estimated mass r parameters that make up the Carburization constant for an actual Worn-blown Q-BOP process were used While the water modeling results in a apprehensive dimensional analysis to correlations that can predict the decarburization constants from the operating parameters and physical properties of the system. The predicted values are in close agreement with decarburization constants found for commercial converters. These correlations were subsequently used to consider the optimization of batch bottom-blown oxygen steelmaking processes and to assess the feasibility of the proposed continuous refining process. The results indicated that the process proposed by the AISI has limited applicability.