化工学报2017，Vol.68Issue(11)：4105-4111,7.DOI:10.11949/j.issn.0438-1157.20170542
超细颗粒聚团流化的临界流化速度
Minimum fluidization velocity of ultrafine particle agglomerates
摘要
Abstract
Minimum fluidization velocity (Umf ) of three ultrafine particles (SiO2, Al2O3 and TiO2) was measured in a fluidized bed with inner diameter of 50 mm. The primary particle size (dp) of these ultrafine particles was ranged from 30 nm to 5μm and Geldart A reference particle was a size of 45μm. Results show that all three particles have the sameUmf change pattern with increase of primary particle size.Umf first increased gradually as dp increased from 30 nm to 5μm and thenUmf decreased sharply asdp increased further to 45μm.Umf atdp =45μm was close to that ofdp =30 nm and 200 nm.Umf of different materials decreased in the order of TiO2, Al2O3, SiO2. For particles of the same material,dp effect onUmf was similar to that of repose angle, which reached to a maximum atdp =5 μm. Simulation by agglomerate force balance model shows that average size of fluidized agglomerates is changed similarly to that ofUmf with regards to different materials and primary particle sizes.关键词
超细颗粒/团聚/流化床/临界流化速度/力平衡模型Key words
ultrafine particle/agglomeration/fluidized bed/minimum fluidization velocity/force balance model分类
化学化工引用本文复制引用
刘道银,王远保,王铮,陈晓平..超细颗粒聚团流化的临界流化速度[J].化工学报,2017,68(11):4105-4111,7.基金项目
国家自然科学基金项目(51676042).supported by the National Natural Science Foundation of China (51676042). （51676042）
