DUST EMISSION AND AGGLOMERATION IN ELECTRIC ARC FURNACE (EAF)

摘要

In order to propose economically feasible solutions for both recycling and reducing EAF dust, the understanding and the quantification of the dust formation is necessary. This study focuses on the main emission mechanism - bubble burst at the liquid bath surface - and on the agglomeration of dust particles in fume extraction system. We developed an original experimental device for studying the burst of gas bubbles on a liquid steel surface. Results show that the major contribution to dust formation is the emission of film drops, which come from the fragmentation of the bubble cap. A significant decrease of the projected droplets can be achieved by decreasing the size of the bursting bubbles. Agglomeration and coalescence of emitted particles in exhaust ducts were described according to a sectional model based on the discretization method proposed by Kumar and Ramkrishna [1]. It enables the calculation of the evolution of the particle size distribution according to the extraction conditions.