150t复吹转炉熔池传质及合适的底吹气量

Mass Transfer and Optimal Bottom Blown Gas Amount in 150 t Top-Bottom Converter Bath

通过水模型实验研究了复吹转炉中顶吹、底吹及熔池产生的CO气流对熔池的搅拌作用。按正交实验设计法,由实验得出吹炼中期和后期影响熔池内传质的主要因素及合适的顶吹和底吹气量。在高速脱碳期,顶吹和底吹气流的搅拌作用与CO气流的相比可忽略不计;在脱碳后期,底吹气流对熔池的搅拌起主要作用。在吹炼后期,底吹气量为5Nm^3/h时可达到最佳的搅拌效果。根据水模型实验结果,回归整理出混匀时间和容量传质系数的准数方程。

By hydrodynamic model experiments, the effect of topblown gas, bottom blown gas and CO gas on bath stirring in 150 t top-bottom converter were studicdt According to method of orthogonal experiment design, the essetial factors and optimal amount of top and bottom gas were found. At high carbon range, compared with the stirring by CO, the stirring by top and bottom blown gas could be neglected; at low carbon range, the stirring by bottom blown gas was the main factor. The optimal gas amound was about 5 Nm3/h. The equations of mixture time and rate constant of mass transfer were established.