中央扩散式喷嘴颗粒分布特性的冷模实验

针对闪速冶炼过程出现的反应慢和大滞后等问题，建立中央扩散式精矿喷嘴冷模实验装置，研究喷嘴出口附近区域颗粒分布均匀性随工艺风和分散风流量的变化规律.结果表明:反应塔内颗粒分布均匀性可调，分散风使颗粒沿水平方向分散，工艺风使颗粒聚集于反应塔喷嘴正下方区域；分散风和工艺风动量比决定塔内颗粒分布均匀性，动量比越小颗粒越聚集于反应塔喷嘴正下方区域；动量比可将实验范围内各工况颗粒分布均匀性特征指标——颗粒质量偏析函数拟合为指数函数；在颗粒适度分散前提下，喷嘴分散风流量增加倍数和投料速度增加倍数、工艺风流量增加倍数相同.

Cold Model Experiment for Particles Distribution of CJD Burner

To solve the problems such as more awkward reaction way and large performance delay in the flash smelting process， a cold model experiment device of a CJD(central jet distributed) burner for flash smelting furnace was set up， and the change of particles dispersion near the burner with the process air and the distribution air was studied. The results showed that the particles dispersion leaving from the burner can be regulated. The particles disperse along the horizontal direction under distribution air， and concentrates in the central area under tower by process air. The momentum ratio can affect particles distribution directly， and the smaller it is， the particles are more concentrated in the central area under tower. Within the scope of experimental data， the mass segregation function， which means particles distribution uniformity index， can be fitted as the nonlinear exponential function with momentum ratio. In the case of moderate particles dispersion， the increasing multiples of distribution air are the same as that of loading rate and that of process air.