螺旋外导流槽式脱硫喷枪的数值模拟及应用研究

Numerical simulation and application of desulfurization lance with external spiral guiding groove

针对常规直通式单口喷枪喷吹金属颗粒镁铁水脱硫存在的脱硫反应动力学条件差的问题,提出了螺旋外导流槽式脱硫喷枪,并对其喷吹过程进行了数值模拟研究。通过对比发现,螺旋导流槽式脱硫喷枪能够有效提高气体对熔池的搅拌作用,同时减弱铁水喷溅。某钢厂250 t铁水罐的铁水金属颗粒直接喷吹脱硫工业性试验与应用表明,铁水喷溅与渣面金属镁蒸气逃逸燃烧明显降低,脱硫剂平均单耗降低6.0%,喷枪平均寿命达180炉/支,应用效果优良。

Aiming at the poor kinetic conditions of hot metal desulfurization with granular magnesium injection by a lance with single straight nozzle and the difficulties in the implementation of mechanical lance rotation,a lance with external spiral guiding groove was proposed,and the injection process was numerically simulated.It is found that the lance with spiral guiding groove can effectively improve the stirring of hot metal and reduce splashing compared with the conventional one.The industrial test and application of hot metal desulfurization with granular magnesium injection in a 250 t hot metal ladle in a steel plant show that,the hot metal splashing and magnesium vapor combustion on the slag surface are significantly reduced.The unit consumption of desulfurizer is reduced by 6.0%on average and the average service life of injection lance reaches 180 heats,which show its excellent application effect.