文献类型：期刊文献

中文题名：旋流场超细颗粒聚集实验研究

英文题名：Experimental investigation on aggregation of ultrafine particles in swirling flow field

作者：刘毅[1];汪华林[2];杨强[1]

机构：[1]华东理工大学化工机械研究所,上海200237;[2]华东理工大学化学工程联合国家重点实验室,上海200237

年份：2010

卷号：4

期号：3

起止页码：717

中文期刊名：环境工程学报

外文期刊名：Chinese Journal of Environmental Engineering

收录：CSTPCD;;Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：旋流场;超细颗粒;聚集极限;分离效率

外文关键词：swirling flow field; ultrafine particles; aggregation limit; separation efficiency

摘要：不同粒径分布和浓度的催化裂化(FCC)三旋回收超细催化剂颗粒在旋流场中经过50 h循环回流,颗粒中值粒径变化明显。物料中分散相越多、颗粒粒径越小时,颗粒碰撞越频繁,其聚集趋势越明显。颗粒聚集体在旋流场内不够稳定,通过对比不同进料速率下的旋流场聚集效果,得到最适合颗粒聚集的旋流场雷诺数为20 000。颗粒聚集体存在聚集极限粒径,其最佳聚集时间约为40 h,颗粒聚集后的旋流分离效率提高近5%。
The medium size of the ultrafine catalyst particles with diverse particle distribution and concentration varies significantly after 50 hours＇ circulation in hydrocyclone from FCC three-stage cyclone.If the dispersed phase takes up more proportion or the particles are smaller,the particles collide more frequently and the tendency of aggregation appears more apparent.The tests of congregational rate show that because of unstable enough aggregation of the particles,it is easiest for the particles to aggregate with the Reynolds number at 20 000 under different feed rates.The optimized aggregation time is around 40 hours,after which the separation efficiency increases by 5% due to the existence of aggregation limit.