Mixing and Segregation Behavior in a Spout-Fluid Bed: Effect of Particle Size

Mixing and Segregation Behavior in a Spout-Fluid Bed: Effect of Particle Size
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喷动流化床中的混合和分离行为:粒径的影响

DOI:
10.1021/ie301005n
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发表时间:
2012-10
期刊:
Industrial & Engineering Chemistry Research
影响因子:
--
通讯作者:
肖睿
肖睿
中科院分区:
其他
文献类型:
--
作者:
张勇;钟文琪;金保昇;肖睿

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在喷动流化床中对二元混合物的混合和分离行为进行了实验研究。通过混合具有相同密度和不同尺寸的玻璃珠,使用三种类型的二元混合物。调节喷动和流化气体流速以覆盖一系列流动状态,通常包括内部射流(IJ)、具有鼓泡的流化床中的射流(JFB)、喷动(S)和喷动流体(SF)。从流态、浓度分布和混合指数等方面分析了混合和分离行为。结果表明,在射流中,颗粒循环与局部偏析相结合,小颗粒迁移到射流和停滞区之间的界面,甚至进入后者。在S中,粒子的分布很大程度上取决于喷泉结构。在JFB中,发生轴向偏析,其中较小的颗粒在床的上部占优势。随着颗粒尺寸差异的增加,偏析变得更加明显。此外,
The mixing and segregation behavior of a binary mixture have been investigated experimentally in a spout-fluid bed. Three types of binary mixtures were used by mixing glass beads with equal density and dissimilar size. The spouting and fluidizing gas flow rate were adjusted to cover a range of flow regimes, typically including internal jet (IJ), jet in fluidized bed with bubbling (JFB), spouting (S) and spout-fluid (SF). The mixing and segregation behavior were analyzed in terms of flow regimes, concentration profile, and mixing index. The results show that in IJ, the particle circulation is combined with the local segregation where smaller particles migrate to the interface between the jet and stagnant region, even into the latter. In S, the distribution of particle depends greatly on the fountain structure. In JFB, the axial segregation takes place where the smaller particles prevail in the upper part of the bed. Segregation becomes more pronounced with increasing the particle size difference. In additi...
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