喷嘴结构和工艺参数对雾化锌粉粒度的影响

Effects of structure of nozzle and processing parameters on particle size of zinc powders in gas atomization

在自行设计的雾化制粉装置上 ,研究了限制式喷嘴的关键结构参数如输液管内径、喷嘴突出长度等 ,以及雾化工艺参数如压力及液锌的过热度等对锌粉粒度的影响。将所制备的锌粉进行了筛分 ,对粒径的大小和分布进行了分析。实验发现 ,颗粒粒度的分布服从对数正态分布规律。在一定的条件下 ,输液管内径越大 ,输液管突出长度越长 ,锌粉的平均粒度dm、体积平均直径dVm和Sauter平均直径dVs越大 ,即颗粒越粗 ;雾化压力越大 ,液锌的过热度越高 ,dm,dVm和Sauter平均直径dVs越小 。

On an atomization equipment with confined type nozzle, the influence of the diameter of inner delivery tube, protrusion of nozzle, gas pressure and superheat of molten zinc on particle size of zinc powders has been studied. Zinc powders were sieved, the sizes and size distribution of zinc powders were analyzed. There is a wide range of particle sizes which approximate the log normal distribution law. The particle mean diameters, volume mean diameters and Sauter mean diameters of powders increase with diameter of inner delivery tube and nozzle protrusion, and decreases with gas pressure and superheat of molten zinc. In other words, the particle size increases with diameter of inner delivery tube and nozzle protrusion and decrease with gas pressure and superheat of molten zinc.