Reagents Injection Parameters and Clogging T-Shaped Lance

The results of a critical analysis of the operating conditions of immersion lances with a T-shaped tip, which are used for deep injection of powdered reagents into iron-carbon melt for the purpose of desulfurization in non-stationary process conditions, are presented. Based on the symbiosis macrostructural analysis debris removed from the clogged nozzle of submersible lance of desulfurization unit PrJSC «Kamet-Stal» converter shop and the comparison calculated and actually obtained data, conclusions were made regarding the main reasons for the blockage of the nozzle outlet lance T-tip with the complete cessation of the flow of reagents. Clogging one of the nozzles leads to a violation symmetry of the hydrodynamics bucket bath and excessive wave formation, intensification of local wear bucket lining, metal emissions and a decrease in the degree assimilation of magnesium into hot metal sulfur. The main causes of nozzle clogging include the transition from a jet to a bubbling regime of gas-powder jet leakage, with the creation of conditions for reverse hydrodynamic shocks and metal flow into the nozzle, exceeding the dust load of the gas-powder flow to supercritical values, formation of agglomerates from reagents in the working space of the nozzle, taking into account thermal load «gas-nozzle» systems. The actual values ​​of the depth penetration of the metal into the nozzle and the reduction of its cross-section, size and location of the agglomerates are established. A mechanism for clogging the nozzle of a T-tip lance and measures for improving the modes of blowing powdery reagents and their mixtures into a ladle bath are proposed.