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| 1 | 煤粉料仓通气下料流动行为显示文摘在可视化有机玻璃料仓系统上对煤粉下料过程及其特性进行了实验研究。研究表明,煤粉介质粒径小、比表面积大,属于黏附性非自由流动粉体,下料流动困难;料仓通气技术可以显著改善煤粉流动性从而促进料仓下料,但过量通气反而会抑制煤粉下料。通过分析下料过程中料仓壁面的压力信号,揭示了料仓压力分布特性,分析了超侧压现象并定义了压力转换面。实验发现,通气可以在一定程度内减小超侧压幅度,扩大煤粉流化疏松区域,提升转换面高度。此外,研究还发现通气下料过程中存在气体穿透现象,穿透临界高度随通气量的增加而提高,并且穿透后煤粉下料流率降低。 | 陶顺龙 陆海峰 郭晓镭 孙晓林 龚欣 | 2014 | 化工学报2014，65，4： | 8 |
| 2 | Correlation of powder flow properties to interparticle interactions at ambient and high temperatures显示文摘A combination of a continuum approach and a particle–particle approach to describe the multi-scale nature of the mechanical properties of bulk solids may be beneficial to scientific and engineering applications. In this paper, a procedure is proposed to estimate the interparticle forces beginning with the bulk flow properties as measured with standardized techniques. In particular, the relationship between interparticle forces and bulk solid tensile strength is adopted based on the microscale approaches of Rumpf(1970) and Molerus(1975). The flow properties of fluid cracking catalyst(FCC), corundum and glass bead powders were all characterized with a modified Schulze ring shear cell capable of operating at temperatures up to 500℃. The powder test conditions were selected such that the van der Waals forces were the most significant particle–particle interactions. The model equations describe two cases, in which either elastic or plastic deformation of the contact points is assumed. The results indicate that the model provides the correct order of magnitude for the values of the tensile strength when proper values for the mean curvature radius at the contact points are taken into account. A sensitivity analysis for the main parameters in the model was performed. This analysis indicated that the assumption of plastic deformation at contact surfaces coupled with a decrease in porosity justified an increase of the tensile strength with consolidation stress. Furthermore, the effect of temperature on the measured flow behavior can be explained as a change in the strength of the material. | Igino Tomasetta Diego Barletta Massimo Poletto | 2014 | Particuology2014，12，1： | 5 |
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