Correlation between Liquid/liquid and Gas/liquid Mass Transfers in a Top/Bottom Blowing Converter

Abstract

In this study, a calculation procedure of gas/liquid mass transfer capacity coefficients based on liquid/ liquid ones was developed and cold model studies on benzoic acid transfer between water and liquid paraffin, and oxygen transfer among water, liquid paraffin and air was carried out under various top/bottom blowing rates and liquid/liquid volume ratios. The liquid/liquid mass transfer rate increased with the increase in a top blowing rate, but the increasing rate of a larger vessel diameter to the top blowing rate was lower than that of a smaller one. The gas/liquid mass transfer rate increased with the increase in both of top and bottom blowing rates, but the difference became reduced with the increase in the top blowing rate. The bottom blowing rate to minimize the sum of the top and bottom gas flow rates was almost constant for a given gas/liquid or liquid/liquid mass transfer rate. The liquid/liquid mass transfer rate increased and the gas/liquid one decreased with the increase in liquid paraffin volume ratio to water. There was a roughly positive correlation between the liquid/liquid and gas/liquid mass transfer rates throughout a wide range of top and bottom blowing rates, but the tendency was the opposite under the condition of the same paraffin volume and total blowing rate.KEY WORDS: liquid/liquid mass transfer; gas/liquid mass transfer; top/bottom blowing converter.

Effect of Gas Distribution Mode on Bath Stirring and Mixing in a Bottom‐Blown Converter

“…A moderate increase of bottom gas flowrate was believed to reduce the mixing time and strengthen the dynamic conditions in the molten bath. [ 14–16 ] In the reported literatures of Asai et al, [ 17 ] Mazumdar et al, [ 18 ] Neifer et al, [ 19 ] and Sano et al, [ 20 ] the results revealed that there was an obvious linear relationship between the mixing time and one‐third of gas flowrate. However, the investigators found that the mixing time did not decrease infinitely with an increase of bottom gas flowrate, especially when the bottom gas flowrate exceeded the critical value, the mixing performance in the converter bath became worse instead.…”

Enhanced Impingement Characteristics of Supersonic Oxygen Jets on Molten Bath Using a Multi-nozzle Oxygen Lance in a Converter

“…During the past decades, numerous experimental investigations have been conducted to study the jet characteristics of the traditional oxygen lance and its influence on the stirring process of the molten bath, with a focus on its impact on smelting performance [7][8][9][10][11] . For instance, Collins et al 12) explored 5 the correlation between the maximum penetration depth and jet impact force in the air-water model, highlighting that maximum penetration depth does not necessarily indicate maximum mixing.…”

Stirring Effect of Bottom Regiments Arrangement on the Molten Pool in a 260 t Converter

“…In addition, there are many scholars who also conducted the physical experiments to reveal the influence of bottom tuyeres arrangement on the behaviors of the converter. [13][14][15][16][17][18][19][20] Opinions about how the layout of bottom tuyeres affects the stirring force on the bath are still not unanimous in these literatures. Nevertheless, Lai et al 21) and Yang et al 22) both carried out a water model to investigate the mixing efficiency of the BOF with various bottom tuyeres configurations.…”