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Effect of static bed height in the upper fluidized bed on flow behavior in the lower riser section of a coupled reactor

查看全文 作　　者：Dewu Wang Chunxi Lu Chaoyu [1]Yan 高影响力作者 机构地区：[1]State Key Laboratory of Heavy Oil, China University of Petroleum, Beijing 102249, China高影响力机构 出　　处：《Particuology》索引2009年第7卷第1期,共7页高影响力期刊 基　　金：supported by the 'Major Pro-gram of National Natural Science Foundation of China' (Grant No.20490200);'National Natural Science Funds for Dis-tinguished Young Scholar'(Grant No.20525621) 摘　　要：To study olefin reduction by using an auxiliary reactor for FCC naphtha upgrading, a large-scale cold model of a riser-bed coupled to an upper fluidized bed was established. The effect of static bed height in the upper fluidized bed on particle flow behavior in the lower riser was investigated experimentally. A restriction index of solids holdup was used to evaluate quantitatively the restrictive effect of the upper fluidized bed. Experimental results show that, under the restrictive effect of the upper fluidized bed, the riser could be divided into three regions in the longitudinal direction: accelerating, fully developed and restriction. The axial distribution of solids holdup in the riser is characterized by large solids holdup in the top and bottom sections and small solids holdup in the middle section. Overall solids holdup increased with increasing static bed height in the upper fluidized bed, while particle velocity decreased. Such restrictive effect of the upper fluidized bed could extend from the middle and top sections to the whole riser volume when riser outlet resistance is increased, which increases with increasing static bed height in the upper fluidized bed. The upper bed exerts the strongest restriction on the area close to the riser outlet. 关 键 词：耦合反应器 流动行为 流化床 口部 上游 床高 床层高度 限制作用
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