Elutriation and Species Segregation Characteristics of Polydisperse Mixtures of Group B Particles in a dilute CFB Riser

被引：35

作者：

Chew, Jia Wei ^{[1
]}

Parker, Drew M. ^{[1
]}

Hrenya, Christine M. ^{[1
]}

机构：

[1] Univ Colorado, Dept Chem & Biol Engn, Boulder, CO 80309 USA

来源：

AICHE JOURNAL | 2013年 / 59卷 / 01期

基金：

美国国家科学基金会;

关键词：

binary mixture; continuous particle size distribution; Geldart Group B; circulating fluidized bed riser; elutriation; entrainment; species segregation; CIRCULATING FLUIDIZED-BED; CONTINUOUS SIZE DISTRIBUTIONS; CLUSTER CHARACTERISTICS; GRANULAR TEMPERATURE; BINARY-MIXTURES; KINETIC-THEORY; RATE CONSTANTS; FLOW; HYDRODYNAMICS; ENTRAINMENT;

D O I：

10.1002/aic.13784

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Experiments in a dilute, gas-solids circulating fluidized bed have been conducted, with an emphasis on the impact of polydispersity on elutriation and species segregation. Two categories of polydispersity were studied: binary mixtures with various compositions and continuous particle size distributions (PSDs) with various widths. Qualitative differences between the two include (i) total elutriation flux of binary mixtures increases with the composition of fines (U-t < U-s) but not so for continuous PSDs and (ii) elutriation flux of coarse particles (U-t > U-s) depends non-monotonically on fines composition for binary mixtures but monotonically for continuous PSDs. These differences are explained by the increasing size disparity of continuous PSDs as distribution width increases, while the size disparity remains constant in binary mixtures of varying compositions. A third qualitative difference is the monotonic decrease in mass % of coarse particles with riser height observed for continuous PSDs, and a nonmonotonic behavior for binary mixtures. (C) 2012 American Institute of Chemical Engineers AIChE J, 59: 84-95, 2013

引用

页码：84 / 95

页数：12