Characterizing particle aggregates in a high-density and high-flux CFB riser

被引：128
作者：
Manyele, SV [1 ]
Pärssinen, JH [1 ]
Zhu, JX [1 ]
机构：
[1] Univ Western Ontario, Dept Chem & Biochem Engn, London, ON N6A 5B9, Canada
来源：
CHEMICAL ENGINEERING JOURNAL | 2002年 / 88卷 / 1-3期
基金：
加拿大自然科学与工程研究理事会;
关键词：
high-density riser; concentration fiber optic probe; cluster time fraction; existence time; cluster frequency;
D O I：
10.1016/S1385-8947(01)00299-6
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Particle aggregates play an important role in the performance of circulating fluidized beds (CFBs). This paper presents a study on the aggregate properties in a high-flux and high-density riser (10 m high and 76.2 mm i.d.), based on the solids concentration measurements using a fiber optic probe. The gas velocities ranged from 5.5 to 10 m/s and solids circulation rate between 100 and 550 kg/m(2) s. Sensitivity analysis was first conducted to establish the optimum settings for determining cluster parameters. Aggregate properties (frequency, time fraction, existence time, average solids concentration and cluster vertical dimension) were established using transient solids concentration data, based on the results of the sensitivity analysis. These parameters revealed a strong dependence of the aggregate properties on operating conditions, local mean solids concentration, radial position and axial elevation. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：151 / 161
页数：11
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