高密度颗粒相HfO_2的流态化特性研究  

Fluidization Characteristics of High-Density Particles of HfO_2

作　　者：刘坤[1] 陈松[1] 王力军[1] 

机构地区：[1]北京有色金属研究总院稀有金属冶金研究所,北京100088

出　　处：《稀有金属》2015年第7期617-622,共6页Chinese Journal of Rare Metals

基　　金：国家科技部"十二五"国家科技支撑计划课题(2012BAB10B10)资助

摘　　要：研究了高密度物料HfO2在流态化方面的特点。在物料类型的研究中,使用床层塌落法对粒度为74~100μm的HfO2颗粒进行研究,结果表明：粒度为74~100μm的Hf O2属于B类物料,适用于鼓泡床或者湍流床。使用公式计算和实际实验进行对比,结果表明：低密度物料的临界流化速度经验公式同样适用于高密度物料HfO2的临界流态化速度计算;74~100μm的HfO2颗粒物料在流化过程未形成散式流态化状态,直接从沟流状态进入聚式流化状态;在粒度为74~100μm的HfO2颗粒的冷态流态化实验中,气流速度小于5 m3·h-1时,床层局部出现气孔,气流速度为5~8 m3·h-1时,床层处于沟流和完全流态化的过渡态;气流速度大于8 m3·h-1后基本完成了流态化;气流速度大于12 m3·h-1时,底部死角区域开始流动;气流速度从12降到6 m3·h-1的过程中,床层保持了一个较为稳定的床高和压力波动,可以获得更多的稳态流态化操作范围。The characteristics of high-density material HfO2 in the fluidized bed were studied through calculation and experiment. The bed collapse method was used to study the material types of HfO2 with diameter in the range of 74 ~ 100 μm. The results showed that HfO2 of 74 ~ 100 μm was Class B materials,applying to bubbling bed or turbulent bed. The comparison between theoretical calculations and actual experiments proved that the critical fluidization velocity empirical formula of low-density material could also be applied to that of high-density material; HfO2 with diameter in the range of 74 ~ 100 μm transformed into aggregative fluidization from channeling fluidized bed instead of dispersed fluidization; when the gas velocity was less than 5 m3·h- 1,stomata occurred in a small portion of HfO2particles; when the gas velocity was between 5 ~ 8 m3·h- 1,only part of the materials were fluidized; when the gas velocity was more than 8 m3·h- 1,most of the fluidized bed completed the fluidization; when the gas velocity was more than 12 m3·h- 1,the bottom dead area began to flow. With the gas velocity decreasing from 12 to 6 m3·h- 1,the bed kept relatively stable bed height and pressure fluctuations,which could get more steady-state and fluid operating ranges.

关 键 词：HFO2 鼓泡床 B类物料 起始流态化速度 

分 类 号：TF031[冶金工程—冶金物理化学]