| Popis: |
In an EAF, most of the energy transferred from the arc to the steel occurs via radiative heat transfer. Therefore, the development of a model that accurately describes this phenomena is key to understand the dynamics of the metal’s melting process. Despite its importance, radiation mechanisms have been underestimated in studies using parameter-estimation techniquesand in those that assuming simplified geometries avoid dealing with shadings and blockages in view-lines. In this work, we propose a novel first principles model that for the first time explicitly considers the electrode’s surfaces, view-lines blockages, and shading effects. Radiative exchanges are modeled as a linear resistive circuit that dynamically changes in topology and that rely on Monte-Carlo algorithms for the calculation of view-factors. Numerical results were validated against process data and errors were contained to 5% in terms of melting time, energy consumption, and liquid steel temperature. |
