%0 Journal Article
%T Hydrodynamic Performance of Fluidized Bed with Vertical Sieve Tray
垂直筛板流化床中FCC催化剂的流化性能
%A DONG Qun
%A JIA Zhao
%A WANG Shu-yan
%A
董群
%A 贾昭
%A 王淑彦
%J 过程工程学报
%D 2012
%I
%X 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.
%K fluidized bed
%K vertical sieve trays
%K elevated quantity
%K inner-loop
%K cap
流化床
%K 垂直筛板
%K 提升量
%K 内构件
%K 帽罩
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=3FCF8B1A330466D5&jid=B9EE12934D19905403D996AE65CEEEED&aid=21CB0722CA48644FCC6D856AE519D879&yid=99E9153A83D4CB11&vid=59906B3B2830C2C5&iid=E158A972A605785F&sid=C7A2B92569DF5458&eid=8DBE05486163BAB2&journal_id=1009-606X&journal_name=过程工程学报&referenced_num=0&reference_num=0