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›› 2012, Vol. 12 ›› Issue (4): 558-563.

• 流动与传递 • 上一篇    下一篇

垂直筛板流化床中FCC催化剂的流化性能

董群 贾昭 王淑彦   

  1. 东北石油大学化学化工学院 中国科学院过程工程研究所 东北石油大学石油工程学院
  • 收稿日期:2012-03-13 修回日期:2012-05-17 出版日期:2012-08-20 发布日期:2012-08-20
  • 通讯作者: 董群

Hydrodynamic Performance of Fluidized Bed with Vertical Sieve Tray

DONG Qun JIA Zhao WANG Shu-yan   

  1. School of Chemistry and Chemical Engineering, Northeast Petroleum University Institute of Process Engineering, Chinese Academy of Sciences School of Petroleum Engineering, Northeast Petroleum University
  • Received:2012-03-13 Revised:2012-05-17 Online:2012-08-20 Published:2012-08-20
  • Contact: DONG Qun

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被引次数

1

摘要： 以FCC催化剂颗粒研究垂直筛板流化床内构件对气固两相流化性能的影响，考察了板孔气速、颗粒循环量和帽罩开孔比等筛板结构对流化床压降和提升量强度的影响. 结果表明，气固两相总体逆流流动条件下，帽罩内气速达4 m/s，气固高速并流喷射无气泡，两相接触好、返混小，属快速流态化. 由于没有气泡，床层压力波动小，在塔板上颗粒返混小. 垂直筛板压降随板孔气速、帽罩底隙高度增大而增大，随帽罩开孔比、板孔径增大而减小，颗粒提升量大，床层压降大. 提升量强度随板孔气速、帽罩底隙高度、颗粒循环量增加而增大，随帽罩高度与塔节高度比增大而减少，随帽罩筛孔孔径变化存在最大值. 当帽罩开孔比为1.2~2.5、板孔面积与帽罩截面积比为0.42、帽罩底隙高与板孔孔径比为0.36~0.64时帽罩流化性能较好.

关键词: 流化床, 垂直筛板, 提升量, 内构件, 帽罩

Abstract: Gas-solid fluidization of the vertical sieve tray as fluidized bed internals was carried out experimentally using FCC catalyst. The effects of gas velocity in tray hole, circulation rate of solid, opening ratio of the caps and other sieve tray structures on pressure drop and elevated quantity of fluidized bed are studied. The results show that the vertical sieve tray fluidized bed makes possible high speed bubbleless jet co-flow at air velocity of 4 m/s within the caps for the gas-solid countercurrent flow mode, leading to a desirable gas solid contact, reduced back-mixing, fast fluidization and small fluctuation due to no bubbles in bed. Pressure drop of the bed rises with the increase of gas velocity in tray hole, and decreases with the rise of opening fraction of the cap and diameter of tray hole. A great rate of solids lift will lead to a high pressure drop of the bed. The rate of solids lift rises with the increase of gas velocity in tray hole, height of bottom clearance and circulation rate of solids, and decreases with the rise of height of the cap and tower section. The rate of solids lift is maximized at an intermediate diameter of tray hole. When the opening fraction is from 1.2 to 2.5, tray hole area/cap sectional area 0.42, and bottom clearance height/tray hole diameter between 0.36 and 0.64, excellent hydrodynamic performance can be reached.

Key words: fluidized bed, vertical sieve trays, elevated quantity, inner-loop, cap

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