| 提升管-下行床耦合反应器内颗粒混合行为 |
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| 引用本文： | 刘会娥,杨艳辉,魏飞,金涌. 提升管-下行床耦合反应器内颗粒混合行为[J]. 化工学报, 2002, 53(3): 302-306 |
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| 作者姓名： | 刘会娥 杨艳辉 魏飞 金涌 |
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| 作者单位： | 清华大学化学工程系 |
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| 摘 要： | 引 言循环流化床中气固两相的流动有两种不同的方式 :提升管中为气固并流上行的逆重力场运动 ,下行床中为气固并流下行的顺重力场运动 .其差异表现为提升管内颗粒浓度、速度以及气体速度在径向上严重的不均匀 ,颗粒浓度概率密度分布以及速度的瞬时信号都表明了颗粒团 -空穴两相结构的存在[1] ,一些研究[2 ,3] 还发现提升管中颗粒的停留时间分布 (ＲＴＤ)曲线存在较大的拖尾甚至出现双峰 ,研究者认为提升管内存在弥散颗粒和颗粒团两种不同的混合机理 ;下行床则比提升管大大改善 ,气固速度、颗粒浓度沿径向分布要均匀得多 ,颗粒的ＲＴＤ曲线…
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| 关 键 词： | 提升管 下行床 耦合反应器 颗粒混合行为 综合混合行为 气固两相流 循环流化床 |
| 文章编号： | 0438-1157(2002)03-0302-05 |
| 修稿时间： | 2001-02-27 |
STUDY ON SOLIDS MIXING BEHAVIOR IN RISER-DOWNER-COUPLING CIRCULATING FLUIDIZED BED |
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| LIU Hui''e,YANG Yanhui,WEI Fei,JIN Yong. STUDY ON SOLIDS MIXING BEHAVIOR IN RISER-DOWNER-COUPLING CIRCULATING FLUIDIZED BED[J]. Journal of Chemical Industry and Engineering(China), 2002, 53(3): 302-306 |
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| Authors: | LIU Hui''e YANG Yanhui WEI Fei JIN Yong |
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| Abstract: | Riser has the advantage of high gas-solids contact efficiency,high gas/solids flux and so on.But there is relatively significant gas and solids backmixing.On the ether hand,downer has the great advantage of uniform gas and solids residence time, but the entrance structure has great influence on its performance and the solid concentration is much lower than that in riser.A new type of Riser-Downer-Coupling Circulating Fluidized Bed (RDCCFB) is devised in this research, which is a close combination of riser and downer.This new type of CFB takes advantage of both riser and downer.Phosphor particles were used as tracers to study the solid mixing behavior in a cold-model RDCCFB.The results show that the overall Peclet Number is greater than that in a single riser.And the average residence time and the residence time distribution of the particles can be changed according to the requirement.These characteristics make this coupling reactor attractive in many areas. |
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| Keywords: | riser downer coupling reactor particle mixing behavior |
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