RH精炼过程吹气对喷粉脱硫影响的数值模拟

doi:10.13228/j.boyuan.issn1006-9356.20230362

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Abstract In order to study the influence of gas injection parameters on the powder injection desulfurization during RH refining process and improve the efficiency of desulfurization, three-dimensional coupled k-ε turbulence model, volume of fluid (VOF) model, discrete phase model (DPM), user defined scaler (UDS), and unreacted core desulfurization kinetic model were established based on the powder injection desulfurization process of an actual 230 t RH. The effects of the circulation flow rate of snorkel, injection at the vacuum chamber side, and injection at the ladle bottom on the speed and powder injection desulfurization of molten steel were discussed. The results show that the desulfurizers are mainly concentrated on the interface of vacuum chamber near the downleg side after it is sprayed into the vacuum chamber, and desulfurizers enter the ladle from the downleg with the circulating flow of molten steel. The desulfurizers in the ladle also tend to accumulate on the downleg side. The speed and desulfurization rate of molten steel increase with the increase of the circulation flow rate of snorkel, but the increase is small when the circulation flow rate (standard condition) increases from 1 000 L/min to 2 000 L/min. When the circulation flow rate continues to increase from 2 000 L/min to 3 000 L/min, the speed of molten steel increases significantly, but the end-point desulfurization efficiency only increases by 4.0%. The speed and desulfurization rate of molten steel increase slightly with the 2 000 L/min side injection at the vacuum chamber. When the gas injection with 200 L/min flow rate is carried out at the bottom of the ladle corresponding to the up snorkel, the speed of molten steel in the ladle increases significantly, but the desulfurization rate decreases due to the decrease of residence time for desulfurizer in the ladle. The study provides a theoretical basis for improving the efficiency of the powder injection desulfurization during RH refining process.

Key words： RH refining powder injection desulfurization circulation flow rate injection at vacuum chamber side injection at ladle bottom unreacted core model numerical simulation

Received: 06 June 2023

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	SUN Liang
	SUN Yu
	CHEN Wei
	ZHANG Lifeng

Cite this article:

SUN Liang,SUN Yu,CHEN Wei等. Numerical simulation of gas blowing effect on powder injection desulfurization during RH refining process[J]. China Metallurgy, 2023, 33(11): 127-137.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230362 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I11/127

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