Flow dynamics and contact efficiency in a novel fast-turbulent fluidized bed with ring-feeder internals  

作　　者：Qiang Geng Ping Wang Xiaolin Zhu Xinghua You Chunyi Li 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum(East China) [2]Sinopec Engineering Incorporation [3]Petrochemical Factory of the Yumen Oil-Field Company,PetroChina

出　　处：《Particuology》2015年第4期203-211,共9页颗粒学报（英文版）

基　　金：the financial support of the CNPC in the National Program on Key Basic Research Project(973 Program) of China(No.2012CB215000)

摘　　要：The flow dynamics in a novel fast-turbulent fluidized bed （FTFB） with middle-upper expanding structure and two different ring-feeder internals （mixed and vortex ring-feeder） were studied to achieve a reduction in gasoline olefin production, Compared with a conventional circulating fluidized bed, the novel FTFB displayed unique characteristics and advantages. A higher solids holdup and more uniform solids holdup distribution existed in the diameter-expanding region, especially for the FTFB with vortex ring-feeder structure, A probability density distribution analysis indicated that the novel fluidized bed could reduce gas-solids segregation and enhance gas-solids interaction. A constant carbon dioxide tracer system was used to simulate the reactant gas distribution. The gas-solids contact efficiency was defined according to the solid dispersibility and the amount of gas covering the solid surface. Novel FTFB risers, especially those with vortex ring-feeders, have a much higher gas-solids contact efficiency than that of traditional risers.The flow dynamics in a novel fast-turbulent fluidized bed （FTFB） with middle-upper expanding structure and two different ring-feeder internals （mixed and vortex ring-feeder） were studied to achieve a reduction in gasoline olefin production, Compared with a conventional circulating fluidized bed, the novel FTFB displayed unique characteristics and advantages. A higher solids holdup and more uniform solids holdup distribution existed in the diameter-expanding region, especially for the FTFB with vortex ring-feeder structure, A probability density distribution analysis indicated that the novel fluidized bed could reduce gas-solids segregation and enhance gas-solids interaction. A constant carbon dioxide tracer system was used to simulate the reactant gas distribution. The gas-solids contact efficiency was defined according to the solid dispersibility and the amount of gas covering the solid surface. Novel FTFB risers, especially those with vortex ring-feeders, have a much higher gas-solids contact efficiency than that of traditional risers.

关 键 词：Flow dynamics Fast-turbulent fluidized bed Ring-feeder internal Carbon dioxide tracer Gas-solids contact efficiency 

分 类 号：O35[理学—流体力学]