Effect of powder injection rate on the flow field of coherent lime powder injection (C-LPI) for EAF steelmaking

Abstract

The technology of coherent lime powder injection (C-LPI) was developed and applied in the electric arc furnace steelmaking, which can inject lime powder into the molten pool deeply and effectively. In this paper, a computational fluid dynamics model of C-LPI was developed and the results of numerical simulation were validated by measured data. And then, the interaction between lime powder and carrier gas and the effect of powder injection rate on the jet behaviour of C-LPI were analysed. Results show that more lime powder can keep more kinetic energy in storage and the energy transformation from lime powder to carrier gas could delay the gas velocity attenuation. With larger powder injection rate, more lime powder tends to get together in the middle of gas-powder jet and a part of O2 would be pushed out to the surroundings, which would promote the shrouding combustion reactions at the initial section of C-LPI.