Characterization of the internal morphology of agglomerates produced in a spray fluidized bed by X-ray tomography
Characterization of the internal morphology of agglomerates produced in a spray fluidized bed by X-ray tomography
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DOI：
10.1016/j.powtec.2012.05.051
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发表时间：
2012-09-01
影响因子：
5.2
通讯作者：
Tsotsas, E.
中科院分区：
文献类型：
--
作者：
Dadkhah, M.;Peglow, M.;Tsotsas, E.
利用X射线显微计算机层析成像技术研究了喷雾流态化造粒过程中颗粒的内部结构。X射线层析成像提供了三维体积图像，这些图像首先被用于计数初级粒子，并得出每个粒子的中心坐标位置、半径和体积。通过Add-on算法的进一步分析，得到了各种形态描述符：回转半径、孔隙度、分维和预因子、配位数分布和配位角分布。对于由不同数量的初级粒子组成的凝聚体，从4个到310个，提出并讨论了这些描述符的值和行为。初生颗粒由多孔的γ-Al_2O_3组成，呈近单分散的球形。没有研究固化粘结剂(羟丙基甲基纤维素，最初是水中的稀溶液)的分布。在固定的操作参数下，在顶喷流化床中生成结块。(C)2012爱思唯尔B.V.保留所有权利。
The internal structure of granules produced by spray fluidized bed agglomeration was investigated by means of X-ray micro-computer-tomography. The X-ray tomography delivers three-dimensional volume images, which are first used to count primary particles and derive center coordinate position, radius and volume for each of them. Further analysis by add-on algorithms results in a variety of morphological descriptors: radius of gyration, porosity, fractal dimension and pre-factor, coordination number distribution, and coordination angle distribution. Values and the behavior of these descriptors are presented and discussed for agglomerates consisting of a different number of primary particles, from 4 up to 310. The primary particles were made of porous gamma-Al2O3, and they were nearly mono-dispersed and spherical. The distribution of solidified binder (hydroxyl-propyl-methylcellulose, originally as dilute solution in water) was not investigated. The agglomerates were produced in a top-spray fluidized bed at constant operating parameters. (C) 2012 Elsevier B.V. All rights reserved.