Effect of feed characteristics on the fluidization of separating fluidized bed for dry coal separation
Effect of feed characteristics on the fluidization of separating fluidized bed for dry coal separation
复制标题
进料特性对干法选煤分离流化床流化的影响
DOI：
10.1016/j.powtec.2014.09.014
复制
发表时间：
2015-01-01
影响因子：
5.2
通讯作者：
He, Yaqun
中科院分区：
文献类型：
--
作者：
Dong, Liang;Zhao, Yuemin;He, Yaqun
采用磁粉为重介质的分选床(SFB)进行干法分选。然而，在模块化干法选煤系统的连续分选过程中，进煤口下的床层密度波动较大。采用压力时间序列和图像分析方法，研究了不同密度的进料对沸腾床流态化的影响。颗粒进入床层时，在不同床层高度测得的压力波动剧烈，床面局部下沉。进料后，SFB恢复到原来的状态，即“分离流态化”。然而，对于大颗粒，SFB的稳定性受到了严重的破坏，进料后的“分离床”起到了“鼓泡床”的作用。因此，不应将大到足以破坏SFB稳定性的颗粒送入床层。(C)2014爱思唯尔B.V.保留所有权利。
A separating fluidized bed (SFB) with magnetic powders as the heavy medium was used for dry coal separation. However, during the continuous separation process in the modularized dry coal separation system, the bed density under the coal inlets was found to fluctuate seriously. In this study, the effect of feed with different densities on the fluidization of the SFB was investigated using pressure time series and image analyses. The pressure measured at different bed heights severely fluctuated when particles run into the bed, and the bed surface sunk locally. After feeding, the SFB returned to the previous status, being a "separating fluidized bed". However, for large particles, the stability of the SFB was severely damaged, and the "separating fluidized bed" acted as a "bubbling fluidized bed", after feeding. Therefore, particles large enough to damage the stability of the SFB should not be fed into the bed. (C) 2014 Elsevier B.V. All rights reserved.