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›› 2014, Vol. 14 ›› Issue (3): 383-387.

• 流动与传递 • 上一篇    下一篇

垂直立管中颗粒移动床蠕动流动特性的实验研究

闫雪 张万松 刘人锋 严超宇 魏耀东   

  1. 中国石油大学（北京)理学院 中国石油大学（北京)理学院 中国石油大学（北京) 重质油国家重点实验室 中国石油大学（北京）重质油国家重点实验室 石油大学化工学院
  • 收稿日期:2014-01-17 修回日期:2014-03-27 出版日期:2014-06-20 发布日期:2014-06-20
  • 通讯作者: 闫雪

Experimental Study on Creeping Flow of Moving Particle Bed in a Standpipe

YAN Xue ZHANG Wan-song LIU Ren-feng YAN Chao-yu WEI Yao-dong   

  1. College of Science, China University of Petroleum (Beijing) College of Science, China University of Petroleum (Beijing) State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing) State Key Laboratory of Heavy Oil, China University of Petroleum Dept. Chem. Eng., University of Petroleum, Beijing
  • Received:2014-01-17 Revised:2014-03-27 Online:2014-06-20 Published:2014-06-20
  • Contact: YAN Xue

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被引次数

3

摘要： 在无负压差的环境下，采用PV6D型颗粒速度测量仪，考察了垂直立管中FCC催化剂颗粒移动床的蠕动流动特性. 结果表明，颗粒质量流率较小时立管中颗粒流动具有明显的蠕动流动特性，可划分为两种流态，拟气固雷诺数Re<500时为间歇式蠕动流动，5004000时颗粒的蠕动流动转变为密相流化流动. 立管中颗粒的蠕动流动主要是出口区颗粒成拱与崩塌交替进行产生的，其次为颗粒与器壁滑动摩擦力的不稳定性变化起作用. 微观上颗粒流动的蠕动行为是颗粒之间力链作用变化的结果.

关键词: 立管, 移动床, 蠕动, 颗粒, 速度, 力链

Abstract: Under the condition without negative pressure gradient, experiments were carried out to study the characteristics of moving-bed creeping flow in a standpipe using FCC catalyst particles. The particle velocity in the standpipe was measured with PV6D particle velocity measuring device. The results indicate that there exists an observable creeping flow in the standpipe when the solids flux rate is low. Based on the designed gas-solid Re number, this creeping flow can be divided into intermittent creeping flow (Re<500) and fluctuant creeping flow (5004000. The particle creeping flow results from the discharging and clogging occurring at the orifice alternately, because the particles forms the static arch just above the orifice, and the bridge collapse takes place periodically. And the sliding friction force between the particles and wall also affects creeping flow. It is the evolution of force chain among the particles that contributes to the creeping flow behavior.

Key words: standpipe, moving-bed, creeping flow, particle, velocity, force chain

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