Abstract
A computation fluid-coupled discrete phase model (CFD-DPM) was used to predict the motion characteristics of gas, particle, and liquid phases in the hot metal ladle. The influence of different voltage loading modes, voltage values, and powder injection speeds on the particle motion trail was investigated, while the effects on the particle concentration maximum difference in the stagnation region were discussed. The optimal injection and voltage parameters were proposed. The results are shown as follows: the loading voltage before injection is beneficial to the diffusion of particles in the molten pool. With the increase of voltage and injection speed, the distribution of particles in the upper part of the molten iron tends to be uniform. The bottom of the ladle is the stagnation region. Optimum voltage and injection speed were determined. Under the optimum conditions, particles are evenly dispersed and the particle concentration difference in the stagnation region is small. This research work will benefit greatly to the hot metal ladle desulfurization technology.
Highlights
As well known, sulfur is the main harmful element affecting the quality and performance of steel
With calcium oxide as the main component, lime is used as the desulfurizer blown into the molten pool by nitrogen gas through the bottom purging plug of the ladle. e voltage is used to destroy the stability of the compound and improve the dynamic condition in the Mathematical Problems in Engineering
With the coupled model used, the effect of voltage load mode and its value, and injection speed on the particle concentration in the bath was investigated. e results show that the voltage loaded on the liquid iron contributes to the uniform diffusion of the calcium oxide particles in the ladle
Summary
Sulfur is the main harmful element affecting the quality and performance of steel. Powder injection technology has received importance as a means to improve refining reactions due to the intimate contact between the particle and metal. E top injection desulfurization technology, inserting the lance into the molten pool, has some serious problems such as the splashing phenomenon, low utilization rate of desulfurizer, pollution of molten steel by lance refractory material, long treatment period, and high cost [2]. Erefore, Pan et al proposed a hot metal bottom powder desulfurization process in which calcium oxide powder particles were injected into ladle baths through the slot plug and the particle motion trail in the slot plug was simulated [7, 8]. With calcium oxide as the main component, lime is used as the desulfurizer blown into the molten pool by nitrogen gas through the bottom purging plug of the ladle. With calcium oxide as the main component, lime is used as the desulfurizer blown into the molten pool by nitrogen gas through the bottom purging plug of the ladle. e voltage is used to destroy the stability of the compound and improve the dynamic condition in the Mathematical Problems in Engineering
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