Mechanisms of Hanging Caused by Dust in a Shaft Furnace

Abstract

The mechanism of hanging caused by the dust in reducing gas in the reduction shift furnace was investigated. Through experimental studies using a rectangular model and theoretical studies using a two dimensional mathematical simulation model, it was clarified that the dust in reducing gas stuck on the packed particles to form a dust blockade zone in front of tuyeres and when the dust concentration of reducing gas was increased or the descending velocity of packed bed was decreased, the dust blockade zone expanded and the gas pressure drop increased to cause hanging.