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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >EVALUATING MIXING IN STIRRED REACTORS BY 3-D VISUALIZATION - PARTIAL SEGREGATION FOR DUAL-FEED SEMI-BATCH OPERATION
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EVALUATING MIXING IN STIRRED REACTORS BY 3-D VISUALIZATION - PARTIAL SEGREGATION FOR DUAL-FEED SEMI-BATCH OPERATION

机译：三维评估混合搅拌反应器可视化,为双线馈电部分隔离SEMI-BATCH操作

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Stirred vessel reactors, when operated semi-batchwise, will exhibit departures from perfect mixing if the reactions being carried out are faster than the rates of mixing induced by stirring. This gives rise to partial segregation between the primary reagents, which will have consequences for selectivity from complex sets of chemical reactions. The extent and intensity of this partial segregation can be visualized in 3-D by single point acid/alkali additions in conjunction with coloured pH indicators. The role of impeller type and design in determing this reactive partial mixing remains obscure. Results for a standard angled blade impeller and an A320 are presented using this approach. The greater convection induced by the Lightnin' impeller produces a less marked, though still significant segregation, when simultaneous 'front' elevation and 'underneath' plan images from a glass semi-tech scale vessel are compared. Surprisingly, there is extreme segregation in the tangential direction, which is difficult to deduce from front view images alone. The 3-D visualizations are supported by CFD simulations using PHOENICS which are presented in see-through solid-body graphics. These theoretical image reconstructions confirm that the degree of partial segregation is more intense for the angled-blade as compared to the A320 impeller. However, the use of an assumption of perfect micromixing in each CFD volume element possibly exaggerates the predicted absolute levels of segregation between acid and alkali. [References: 17]
机译：搅拌容器反应堆,当操作semi-batchwise,会出现偏离完美的混合反应进行速度比混合引起的利率吗激动人心的。主要试剂之间结果从复杂的选择性化学反应。这部分隔离可以通过三维可视化通过单点酸/碱添加结合彩色pH值指标。叶轮的类型和设计反复检测无功部分混合仍然是模糊的。对于标准的角度的叶片叶轮和A320提出了使用这种方法。引起的对流Lightnin的叶轮产生一个不那么明显,但仍然显著种族隔离,同时前面的高程玻璃的图片和下面的计划semi-tech规模船进行了比较。令人惊讶的是,有极端的种族隔离切向的方向,这是很困难的独自演绎从前面看图片。支持可视化CFD模拟利用PHOENICS在透明的架实心图形。重建确认的程度部分隔离的更强烈angled-blade A320叶轮相比。然而,使用一个假设的完美可能在每个CFD微观混合体积元夸大了预测的绝对水平酸和碱之间的隔离。17]

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