Mixing Effect and Energy Efficiency Analysis for Different Lances in Steel Converter Process

The mixing effect in steel converter process is very important to the fluid flow and mass transfer in bath and directly affects the chemical reaction and temperature homogeneity in the industry steel process. The cold model was employed to research the relationship of mixing time, agitation power, lance type, operation parameters, bath shape et al. According to the results, the mixing time of the bath decreases with larger gas flow rate and bigger diameter of the bath. Increasing the nozzle inclination properly is benefit for decreasing the mixing time and improving the agitation of the bath. The relationship of mixing time and lance height is complicated, because the mixing time is fluctuant by the lance rising. By introduce the relative energy utilization factor, the agitation power utilization was analyzed and compared under different conditions. The energy efficiency is higher with larger nozzle inclination as well as the bigger ratio of diameter and depth of the bath.

[1]  城塚 正,et al.  Chemical Engineering Scienceについて , 1962 .

[2]  Kazumi Mori,et al.  Fluid Flow and Mixing Characteristics in a Gas-stirred Molten Metal Bath , 1983 .

[3]  D. N. Ghosh,et al.  Model study of mixing and mass transfer rates of slag-metal in top and bottom blown converters , 1986 .

[4]  Nickolas J. Themelis,et al.  Mixing and Mass Transfer Phenomena in Bottom-Injected Gas–Liquid Reactors , 1987 .

[5]  Ashok Kumar Lahiri,et al.  Determination of mixing time in BOF process by a cold model study , 1988 .

[6]  S. C. Koria,et al.  Experimental study of the effect of gas injection parameters on the bath mixing intensity induced during steelmaking , 1991 .

[7]  Klaus Koch,et al.  Cold model investigations into the effects of bottom blowing in metallurgical reactors , 1995 .

[8]  Manabu Iguchi,et al.  Water model experiment on the liquid flow behavior in a bottom blown bath with top layer , 1996 .

[9]  A. A. Svyazhin,et al.  Mixing of the metal and mass transfer during the tapping of a semifinished product from an oxygen converter , 2005 .

[10]  로드니 제임스 드라이,et al.  Ironmaking and Steelmaking , 2005 .

[11]  S. K. Ajmani,et al.  Cold model studies of mixing and mass transfer in steelmaking vessels , 2005 .

[12]  Qing Liang,et al.  Study on the optimization of the combined blown converter process in Chongqing Iron and Steel Company , 2008 .

[13]  Anders Tilliander,et al.  Mixing Time in a Side-Blown Converter , 2010 .