Projektmenu

Introduction

The basic development of a thermodynamic and kinetic model of the converter steelmaking was completed in Phase I and II of the K1-MET. The first test calculations with the model showed qualitatively fair results considering the time trend for the bath temperature as well as concentration of elements in the metal bath and slag components. Further model improvements are related to the kinetic part of the model.

Objectives and Motivation

  • Modelling of metallurgical reactions in the converter
  • Improvement of existing models
  • Optimization of converter slag
  • Re-use of slag

Methodology

Due to the huge amount of impact factors on the trajectories of elements in the converter steelmaking it’s necessary to evaluate their specific effects. First of all different existing approaches should be evaluated on their influences on the kinetic of reactions like the interfacial area. Additionally a description of the occurrences during the process of charging should deliver more accurate starting conditions for the calculation of the main blowing process. Moreover the post-stirring and re-blowing process has to be implemented in the current program source.

In course of the project a new furnace for dynamic kinetic studies will be built. The kinetic parameters will be evaluated and correlated for the different experimental conditions (static vs dynamic). For the evaluation of the experiment advanced analytical methods will be applies (X-ray spectrometry, SEM).

Furthermore a realistic model for the dissolution behavior of charged materials has to be developed. To realize this targets a new standardized methodology for the characterization of additives is necessary. The outcome of the experiments should be used to develop a more precise mathematical description.

Results and application

A literature review will focus on deepening in description of interaction area including the theory of the droplet formation for converter steelmaking. A realistic model to describe the interfacial surface area for the reaction has to be developed and implemented. The approach should include important properties like: diameter of the droplets, nozzle geometry, turbulence of the bath, furthermore metal and slag properties like density, viscosity and interfacial tension. Further it’s necessary to evaluate the equation with industrial data.

The better description of the scrap melting process should increase the accuracy of the tapping temperature calculation. Additionally the trajectories of the metal and slag phase are influenced by the heat consumption of the charged scrap. An improved formulation of the off-gas calculation and new models of post-stirring and re-blowing have to be developed. Additionally the graphical user interface (GUI) has to be revamped regarded to the latest developments.