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›› 2006, Vol. 6 ›› Issue (2): 173-177.

• 流动与传递 • 上一篇    下一篇

一种新型入口结构的下行管的流体力学性能

朱丙田,侯栓弟,许克家,张占柱,汪燮卿   

  1. 北京石油化工科学研究院
  • 出版日期:2006-04-20 发布日期:2006-04-20

Hydrodynamics of Downer Reactor with a New Inlet Structure

ZHU Bing-tian,HOU Shuan-di,XU Ke-jia,ZHANG Zhan-zhu,WANG Xie-qing   

  1. Research Institute of Petroleum Processing, Beijing
  • Online:2006-04-20 Published:2006-04-20

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被引次数

1

摘要： 提出了一种新型下行管入口结构. 这种结构设有雾化空间，能够提供适宜的床层密度，剂油初始接触采用逆流、错流方式. 在下行管入口处，颗粒浓度呈管中心高、边壁低的分布；随着颗粒向下运动，中心区颗粒浓度逐渐降低，边壁区颗粒浓度升高. 在下行管完全发展段，颗粒浓度径向分布形式不再随轴向位置发生变化.

关键词: 流态化, 下行管入口结构, 下行管反应器

Abstract: A new type of inlet structure of downer reactor was contrived, which included the atomization space of feed oil that enhanced distribution of oil spray to improve oil/catalyst contact efficiency. This inlet structure could provide suitable catalyst concentration to ensure effective oil/catalyst contact and enhance reaction rate. Feed oil contacted catalyst by countercurrent and cross-flow, which would enhance heat and mass transfer between oil and catalyst. It is found that at the inlet section of the downer, solids concentration radial profile is parabolic. As it flows downwards, solids concentration gradually diffuses towards the wall until fully-developed flow section forms. At fully-developed flow section, solids concentration is higher near the wall than that at the center area in the downer.

Key words: fluidization, inlet structure, downer reactor