Modelling Research of Gas Flow Resistance and the Powder Holdup during Two-Phase Flow (Gas + Powder) through the Descending Packed Bed

Abstract

In the shaft metallurgical units (blast furnace, Corex, Finex and Midrex installations) the powder is generated within the process with charge materials as its source or it is introduced into the unit within the process procedure. Accumulation of small particles inside the furnace is diversified and depends on the applied process procedure. Noticeable disruptions of the flow might occur at large degree of dustiness. The article presents the results of model investigation of gas flow resistance and the powder holdup during two-phase flow (gas + powder) through the descending packed bed. The aim of the research was to determine the conditions of the descending bed suspension in the following systems: sinter + coal powder and blast furnace pellets + coal powder. Air was used as a gas. The study results were the basis for defining the conditions in which bed suspension of the model systems occurs. It was found that in case of sinter + coal powder system the most intensive powder holdup in the bed occurs together with the optimal conditions for bed movement distortions.