| 超细粉流化机理和团聚现象的探讨 |
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| 引用本文： | 周勇,梁华琼,石炎福.超细粉流化机理和团聚现象的探讨[J].化学反应工程与工艺,2003,19(4):289-294. |
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| 作者姓名： | 周勇 梁华琼 石炎福 |
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| 作者单位： | 四川大学化工学院,四川,成都,610065 |
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| 基金项目： | 国家自然科学基金(20176031)，四川省科技厅资助项目(01GY051-39)。 |
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| 摘 要： | 在直径60mm的流化床中，以SiO2和TiO2超细粉为原料，考察了粉体物性、粉体填充状态和空气湿度等因素对超细粉流化行为和聚团性质的影响，结果表明：超细粉的流态化经历了活塞流、过渡区和聚团流化3个阶段；聚团的流化行为与大颗粒相似；初始填充状态对超细粉流化行为和聚团大小有重要影响，松填充有利于减小聚团尺寸和减少颗粒夹带，提高流化质量；并结合粉体层受力分析，对超细粉的流化机理和团聚现象进行了探讨。
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| 关 键 词： | 超细粉 流化机理 团聚现象 流态化 |
| 文章编号： | 1001-7631(2003)04-0289-06 |
| 修稿时间： | 2003年2月27日 |
Study on Fluidization Mechanism and Agglomerating Behavior of Ultrafine Powders |
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| ZHOU Yong,LIANG Hua-qiong,SHI Yan-fu.Study on Fluidization Mechanism and Agglomerating Behavior of Ultrafine Powders[J].Chemical Reaction Engineering and Technology,2003,19(4):289-294. |
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| Authors: | ZHOU Yong LIANG Hua-qiong SHI Yan-fu |
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| Abstract: | The fluidization behavior of ultrafine powders SiO_2 and TiO_2 and the effects of powder's properties, packing state and humidity of air on agglomerates' characteristics have been investigated in a bed of 60mm in diameter. It was observed that the fluidizing process of these powders went through three stages: plugging, transiting and agglomerates fluidization with increasing gas velocity, the fluidization behavior of agglomerates was similar to that of larger particles, loose packing of powders was favorable to reduce agglomerates' size, entrainment of powders and improve fluidization quality. Based on these experimental results and analysis of forces acting on powders the fluidization mechanism and agglomerating phenomena of ultrafine powders have been discussed. |
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| Keywords: | fluidization ultrafine powder agglomerating |
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