微小液固流化床的流化特性

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程媛，吴曼，郭庆杰*

（青岛科技大学 化工学院； 清洁化工过程山东省高校重点实验室， 山东 青岛266042）

摘要:在高405 mm、直径15 mm的微小液固流化床中，以水为流化介质，3组不同颗粒为床料，考察了填料高度、颗粒粒径及密度对床层膨胀、液速-压降曲线、最小流化速度和流化质量的影响。实验结果表明：随流速的增大，微小流化床依次出现了固定床、均匀膨胀及流体输送3种流型。各流型操作流速范围不受填料高度影响，但随着颗粒粒径及密度的减小，均匀膨胀区的流速范围减小，最小流化速度降低。随填料高度的增加，床层膨胀率降低，且流化质量提高；颗粒粒径和密度越小，床层膨胀率受液体流速的影响越明显，获得的流化质量越高。

关键词:微小流化床； 流化特性； 流型； 床层膨胀； 流化质量； 最小流化速度

中图分类号：TQ 021.1文献标志码：A

引用格式：程媛，吴曼，郭庆杰.微小液固流化床的流化特性\[J\].青岛科技大学学报（自然科学版），2017，38（3）：80-86.

CHENG Yuan， WU Man， GUO Qingjie. Fluidization properties in a micro-scale liquid-solid fluidized bed \[J\]. Journal of Qingdao University of Science and Technology（Natural Science Edition),2017,38(3)：80-86.

Fluidization Properties in a Micro-scale Liquid-Solid Fluidized Bed

CHENG Yuan， WU Man， GUO Qingjie

 (College of Chemical Engineering;Clean Chemical Processing of Shandong Province, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: The experiment was conducted in a micro-scale liquid-solid fluidized bed with 405 mm high and inner diameter of 15 mm. Water was used as the fluidizing agent. Quartz sand, γ-Al2O3 and activated carbon made from walnut shell were used as the fluidized materials. The effect of filling height, particle diameter and density on the bed expansion, flow velocity and pressure drop relationship, minimum fluidization velocity and fluidization quality were studied respectively. It shows that with the increasing of flow velocity, there are three flow patterns in the microscale liquidsolid fluidized bed. The flow velocity range is independent of filling height. But with the decreasing of particle size and density, the flow velocity range of the uniform expansion area decreases, and the minimum fluidization velocity decreases as well. With the increasing of filling height, the bed expansion ratio decreases and the fluidization quality is improved. For the particles with small size and low density, the expansion ratio is prone to be affected by the flow velocity and the fluidization quality is superior equivalently.

Key words: micro-scale fluidized bed； fluidization property； flow pattern； bed expansion； fluidization quality； the minimum fluidization velocity

 收稿日期：2015-12-14

基金项目：国家自然科学基金项目(21276129)；山东省自然科学基金项目(ZR2015QZ02);青岛市应用基础研究计划资助项目(14-2-4-5-jch).

作者简介：程媛（1991—），女，硕士研究生.*通信联系人.

文章编号：16726987（2017）03008007； DOI： 10.16351/j.1672-6987.2017.03.015