水平浸没式喷吹气体射流反冲现象及其对炉衬蚀损的影响

Back attack phenomena of gas jets submerged horizontally blowing and their effects on refractory lining erosion and wear

以采用套管式喷枪双枪喷吹的１８ｔ ＡＯＤ炉内精炼过程为例，对不同工况下水平旋转和非旋转气体射流的反冲现象及其对炉衬蚀损的影响作了水模拟研究－ 结果表明，与底吹下的情况相比，水平旋转和非旋转气体射流的反冲现象具有各不相同的特征；对这两种射流的反冲现象，主枪气流起决定性的作用，副枪气流则有显著的缓解和抑制效应；熔池内液体的循环运动是引起反冲的另一个重要原因；浮力有相当大的影响，不仅可使反冲强度增高，且会使炉衬局部受损区域扩大；在本工作条件下，枪位的影响不大；在相同的喷吹压力下，射流的旋转运动可使反冲频率和强度降低，并可使炉衬蚀损速率和范围减小；

Taken the refining in a 18 t AOD vessel blowing through two annular tuyeres for example,the “back attack”phenomena of the horizontal rotating and non rotating jets and their effects on the erosion and wear of refractory lining under the different operating modes are investigated in a water model.The results indicate that comparing with the situation in bottom blowing,the horizontal rotating and non rotating gas jets have respectively the different features;on the back attack phenomena of these two jets,the gas stream of the main tuyere has a govening bearing and the sub tuyere stream shows an evident alleviation and preventing effect;the circulative motion of the liquid in the bath is another important reason to bring about the back attack;the buoyancy gives a considerable influence,it is not only able to increase the back attack intensity of a horizontal jet,but also to enlarge the locally eroded and worn zone of refractory lining;the influence of the tuyere position is not so remarkable in the conditions of the present work;the rotating motion of a horizontal jet may decrease the frequency and intensity of the back attack and reduce the eroded and worn rate and area of the refractory under the same bolwing pressure;the annular spiral tuyere with a reasonable structure may be expected to have a good latent using power and composite effectiveness.