ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Stirring Effect in Bath-smelting Furnace with Combined Blowing of Top and Side Blown Oxygen and Bottom Blown Nitrogen
Takeyuki HirataMinoru IshikawaShouji Anezaki
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1992 Volume 32 Issue 2 Pages 182-189

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Abstract

For the development of an energy efficient and highly productive bath-smelting process, the influence of gas blowing method on the post combustion ratio (PCR), the heat transfer efficiency (HTE) and the iron ore reduction rate was studied. The experiments were carried out using a 10 ton test converter with top blown oxygen, side blown oxygen and bottom blown nitrogen, receiving a subsidy from the Ministry of International Trade and Industry.
The combination of top and side blown oxygen and bottom blown nitrogen is found to enable individual control over the stirring intensity of metal and slag with each required degree, resulting in the improvement in PCR, HTE and the reduction rate. The bottom blown nitrogen generates metal droplet which controls PCR and the reduction rate; whereas the side blown oxygen stirs the slag without making excessive amount of metal droplet, increasing HTE without decreasing PCR. The appropriate combination of top and side blown oxygen and bottom blown nitrogen contributes to making favorable conditions to attain the energy efficient and highly productive bath-smelting process.

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© The Iron and Steel Institute of Japan
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