Study on particle dynamics in different cross sectional shapes of air dense medium fluidized bed separator
Study on particle dynamics in different cross sectional shapes of air dense medium fluidized bed separator
复制标题
DOI：
10.1016/j.fuel.2013.04.011
复制
发表时间：
2013-09
期刊：
影响因子：
7.4
通讯作者：
A. Sahu;Alok Tripathy;S. K. Biswal
中科院分区：
文献类型：
--
作者：
A. Sahu;Alok Tripathy;S. K. Biswal
干法洗煤由于其能够在不使用水的情况下生产洁净煤而越来越受欢迎，水正在成为昂贵的净化资源。空气重介质流化床分选技术是一种用于煤炭分选的干法分选技术。以微细粒磁铁矿为介质，采用流态化方法制备拟流体。ADMFBS的有效性取决于流化床的稳定性。本文试图研究具有相同截面积的不同截面形状流化床的稳定性。采用流化指数、颗粒膨胀函数、床层压降、分布器压降、最小流化速度和鼓泡速度等指标对流化床的稳定性进行了表征。研究了不同操作参数和设计参数对流化床均匀性和稳定性的影响。据观察，流化床柱的横截面形状对床层的稳定性有显着的影响。此外，与正方形或圆形形状相比，矩形横截面形状提供更好的稳定性。
Dry coal washing is gaining popularity on account of its ability to produce clean coal without the use of water which is becoming to be a costly resource for beneficiation. Air dense medium fluidized bed separation (ADMFBS) is one of the dry beneficiation techniques which is used for cleaning of coal. Fine magnetite particles are used as medium to make pseudo-fluid by fluidization method. The effectiveness of ADMFBS depends on stability of the fluidized bed. In the present work, an attempt has been made to study the stability characteristics of different cross-sectional shapes of fluidized bed having same cross-sectional area. Different indicators like fluidization index, particulate expansion function, pressure drop of bed and distributor, minimum fluidization and bubbling velocities were used to characterize the stability of fluidized bed. The effect of different operating and design parameters on the homogeneity and stability of the fluidized bed was studied. It was observed that cross sectional shape of the fluidized bed column has a significant effect on the stability of the bed. Moreover, rectangular cross-sectional shape provides better stability properties compared to square or circular shape.