Effect of lance inserting depth

gas flow rate and injection location on mixing time for a 300 t hot metal desulphurization-pretreated by double-lance injection process at Baosteel has been studied by 1 ：3.5 water modelling. Results showed that the effect of stirring by off-centre injection was better than that by centre injection ； the deeper the insertion lance

the shorter the mixing time

but the impact to refractory in bottom increased； with increasing gas flow rate the return flow zone increased and the mixing time decreased ； and the mixing time for injection by bending lance decreased by 10% ~30% as compared with that by straight lance.