耦合反应器提升管段颗粒速度分布及约束特性  

Distributions of particle velocity and restriction behavior in riser section of coupled reactor

作　　者：王德武[1] 张海光[1] 卢春喜[1] 

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《化工学报》2008年第12期3042-3049,共8页CIESC Journal

基　　金：国家自然科学基金重大项目(20490200) ;国家杰出青年科学基金项目(20525621)~~

摘　　要：A large-scale cold model experimental setup of a riser-fluidized bed coupled reactor was established according to the olefin reduction technology with an auxiliary reactor for FCC naphtha upgrading.Distributions of particle velocity in the riser section were experimentally investigated in the setup.Furthermore,the restriction index of particle velocity was defined to quantitatively show the restriction effects of the riser outlet lotus-shaped distributor and the upper fluidized bed on the particle flow behavior in the riser.The experimental results showed that the riser could be divided into two regions in the longitudinal direction,i.e.,lower traditional transport region and upper restriction region.In the longitudinal direction,the averaged cross-sectional particle velocity in the traditional transport region increased firstly,and then tended to be smooth,while decreased in the restriction region.With the increase of static bed height in the upper fluidized bed,the local particle velocity decreased,and the tendency of change in the core region is more than that in the wall region.Restriction effects of the lotus-shaped distributor and the upper fluidized bed on particle flow behavior enhanced with the increases of superficial gas velocity,solids flux and static bed height in the upper fluidized bed.In the same cross-section,outlet restriction effects enhanced with the increase of the dimensionless radial position r/R,and would not change when r/R≥0.5.A large-scale cold model experimental setup of a riser-fluidized bed coupled reactor was established according to the olefin reduction technology with an auxiliary reactor for FCC naphtha upgrading. Distributions of particle velocity in the riser section were experimentally investigated in the setup. Furthermore, the restriction index of particle velocity was defined to quantitatively show the restriction effects of the riser outlet lotus-shaped distributor and the upper fluidized bed on the particle flow behavior in the riser. The experimental results showed that the riser eould be divided into two regions in the longitudinal direction, i.e. , lower traditional transport region and upper restriction region. In the longitudinal direction, the averaged cross-sectional particle velocity in the traditional transport region increased firstly, and then tended to be smooth, while decreased in the restriction region. With the increase of static bed height in the upper fluidized bed, the local particle velocity decreased, and the tendency of change in the core region is more than that in the wall region. Restrietion effects of the lotusshaped distributor and the upper fluidized bed on particle flow behavior enhanced with the increases of superficial gas velocity, solids flux and static bed height in the upper fluidized bed. In the same crosssection, outlet restriction effects enhanced with the increase of the dimensionless radial position r/R, and would not change when r/R≥0. 5.

关 键 词：耦合反应器 提升管 颗粒速度分布 速度约束指数 

分 类 号：TQ051.1[化学工程] TQ052