氧枪布置方式对底吹熔池熔炼过程的影响

采用FLUENT软件,分别选择kε系列湍流模型和雷诺应力模型(RSM)对底吹熔池熔炼炉内的高温熔体气液两相流进行数值模拟,并且依据相似原理,通过水模型实验对数值模拟结果进行验证,综合评价发现Realizable kε模型的计算精度最高。选用Realizable kε模型,对氧枪布置方式及直径对底吹熔池熔炼过程的影响进行数值模拟研究,结果表明:在一定范围内,适当增大氧枪倾角有利于底吹熔池熔炼过程的进行,当单排氧枪倾角在17°~22°之间时,熔池各指标均处于较好的水平;相对于现场工况,双排氧枪倾角分别为12°和22°时,熔池的搅拌效果显著增强;当氧枪倾角为20°时,其有效搅拌区直径为1.475 m,对应的合理氧枪间距为0.98~1.23m;适当减小氧枪直径可以有效提高熔池气含率。

Influence of lance arrangement on bottom-blowing bath smelting process

FLUENT was used to simulate the high temperature melt multiphase flow in oxygen-enriched bottom-blowing bath smelting furnace with a series of k-ε models and Reynolds stress model.Based on similar principles to verify and compare the numerical simulation results with water model experiment.It is indicated that the realizable k-ε model has the best result.Realizable k-ε model is chosen to simulate the influence of lance arrangement and diameter on the oxygen-enriched bottom-blowing bath smelting process.Based on the result,appropriate increase of the lance inclination is helpful for oxygen-enriched bottom-blowing bath smelting process,and when a single row of lance inclination between is 17°-22°,the bath indicators are all in a good level.Relative to site conditions,when the double lance inclinations are 12° and 22°,the bath mixing effects are significantly enhanced.When the lance inclination is 20°,the effective mixing zone diameter is 1.475 m,corresponding to the best lance spacing of 0.98-1.23 m.Appropriately reducing lance diameter can effectively increase the bath gas rate.