%0 Journal Article
%T Effect of Jet Gas on Solid Hold-up Profile in the Feed Injection Section of the Riser<br>喷嘴进料对提升管进料段内颗粒浓度分布的影响
%A E Cheng-lin
%A FAN Yi-ping
%A LU Chun-xi
%A XU Chun-ming
%A <br>鄂承林
%A 范怡平
%A 卢春喜
%A 徐春明
%J 过程工程学报
%D 2008
%I 
%X The effect of jet gas on the radial solid hold-up profile in the feedstock injection section of a FCC riser is investigated in a cold-model FCC riser. The experimental results demonstrate that three types of solid hold-up profiles can be used to describe the effect intensities of jet gas on solid flow in the feed injection zone of the riser. The three types have a distinct W-shaped distribution for very strong effect at the axial locations near the nozzle exits, an annular-core one for very weak effect in the axial positions further from the nozzle exits, and an indistinct W-shaped one for stronger effect between the two areas. Changes of solid hold-up from a W-shaped profile to an annular-core one indicate the lowered effect of jet gas on solid flow when increasing the jet gas velocity or decreasing the pre-lift gas velocity. Furthermore, the momentum ratio of jet gas to pre-lift two-phase mixture, Mj/Mr, is introduced to describe the effects of physical properties of gas and solid, operating conditions, and equipment configuration on solid hold-up distribution. With increasing Mj/Mr, the radial solid hold-up profile turns gradually from a W-shaped to an annular-core. The effects of operating conditions and equipment dimensions on solid flow are dependent on the momentum ratio, They are about 0.675-1.075 m when the momentum ratio is smaller than 4.21, and about 0.375-0.675 m when the momentum ratio is greater than 4.21.
%K FCC riser
%K feed injection section
%K solid hold-up
%K momentum ratio<br>提升管
%K 进料段
%K 颗粒浓度
%K 动量比
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=3FCF8B1A330466D5&jid=B9EE12934D19905403D996AE65CEEEED&aid=D1E74C6A5ACCDE580FD01F00DC090C0A&yid=67289AFF6305E306&vid=5D311CA918CA9A03&iid=CA4FD0336C81A37A&sid=13553B2D12F347E8&eid=BC12EA701C895178&journal_id=1009-606X&journal_name=过程工程学报&referenced_num=1&reference_num=12