新型构件下多级环流反应器的流体力学行为
首发时间:2007-12-04
摘要:基于多釜串联可以有效减小返混的原理,通过引入特殊设计的级间构件构建了一种新型的多级内环流反应器。合适的气垫层高度不仅能保证级间的正常流动,还能保证多级内环流反应器中级内的正常循环流动。实验研究了多孔板级间构件和新型气浆分离式级间构件对固含率轴向分布的影响,以及固体颗粒浓度,表观气速,表观液速和开孔率对级间气垫层高度的影响。实验结果表明新型气液分离式级间构件与多孔板级间构件相比更有利于实现催化剂颗粒轴向的均匀分布,非常适合于那些具有较慢反应速率但要求高转化率的气液固三相反应体系;同时级间气垫层高度随表观气速的增大而增大,随表观液速的增大而减小。
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Hydrodynamics of a multi-stage internal-loop airlift reactor under the novel Internal
Abstract:Specially designed internals were used in a novel multi-stage internal-loop airlift slurry reactor to effectively decrease the liquid backmixing and homogeneously suspend the solid particles. A proper gas layer height can ensure the normal slurry flow for both each stage and between two stages. Effects of the inter-stage internal of the perforated plate and the novel gas-slurry separation internal on the solid distribution are studied experimentally, and effects of solid loading, superficial gas and liquid velocity and opening ratio on the gas layer height were also investigated. The results show that the novel gas-slurry separation internal is more beneficial to achieve uniform solid distribution between two stages than the internal of the perforated plate, which is very effective for three-phase system requiring high conversion and slower reaction velocity; the gas layer height increases with the increasing superficial gas velocity and decreases with the increasing superficial liquid velocity.
Keywords: multi-stage airlift reactor;inter-stage internal;solid holdup;gas layer height
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