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基于流态化理论设计出了符合本试验研究要求的流化床反应器,并用其对不同粒度的高磷赤铁矿粉,尤其是平均粒径为2μm左右超细粉的流态化流动规律进行了一些冷态的基础试验研究,给后续高磷铁矿石的脱磷研究和试验提供了一定的参考。试验中实现了各常规粒度级矿粉颗粒的流态化过程,且临界流化速度试验测量值与理论计算值相差不大。其中,0.074 mm以下细矿、平均粒度为2μm超细矿粉颗粒的流化过程为:在低气速时,矿粉颗粒床层首先出现沟流;气速增加,沟流加剧,有时形成节涌;气速达到一个远超过理论初始流化速度的临界值(崩裂速度)时,床层突然分裂成许多小的聚团体,这些小的聚团体和细小颗粒呈现出较为均匀的流化状态。
Based on the theory of fluidization, a fluidized bed reactor that meets the requirements of this pilot study was designed and used to study the fluidized flow patterns of high-phosphorus hematite powders with different particle sizes, especially those with an average particle size of 2μm Some basic experimental research in cold state was carried out, which provided some references for the dephosphorization research and experiment of high phosphorus iron ore. In the experiment, the fluidization process of various conventional particle sizes of ore particles was realized, and the critical fluidization velocity test measured value is not much different from the theoretical calculation value. Among them, the fine ore below 0.074 mm, the average particle size of 2μm ultrafine slag particles fluidization process: at low gas velocities, the bed of mineral particles first appear channeling; gas velocity increases, the channel increases, and sometimes form a section When the gas velocity reaches a critical value (fracture velocity) that far exceeds the theoretical initial fluidization velocity, the bed suddenly breaks into many small agglomerations, which show a more uniform fluidization state.