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Rate-based modelling and simulation of distillation columns with sandwich packings

机译：基于速率的三明治填料精馏塔建模与仿真

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摘要

Sandwich packings are innovative column internals consisting of two layers of ordinary packing with different geometrical surface area. The layer with the high surface area, hold-up layer, has a lower flooding point as compared to another, de-entrainment layer. Sandwich packings can be operated even when the hold-up layer is flooded. In operation, different fluid dynamic regimes occur along the column. The flow in the flooded hold-up layer is comparable with that in trays. A froth regime is established above the hold-up layer, whereas a film flow develops in the remaining part of the de-entrainment layer. The proper design of sandwich packings requires a mass transfer model capable of considering all these different regimes. In this work, the rate-based concept is used to develop a mass transfer model of sandwich packings. This model employs two alternate column segments. One of them corresponds to de-entrainment layer, and here, mass transfer correlations for packed columns are applied. Another segment is related to the hold-up layer; it is described with correlations for sieve tray columns. The developed mass transfer model is validated with experimental efficiency data for sandwich packings. (C) 2015 Elsevier B.V. All rights reserved.
机译：三明治填料是创新的色谱柱内部构件，由两层具有不同几何表面积的普通填料组成。与另一个去夹带层相比，具有高表面积的层（保持层）具有较低的溢流点。即使保持层被淹没，三明治填料也可以使用。在操作中，沿色谱柱会发生不同的流体动力学状态。溢流的滞留层中的流量与塔盘中的流量相当。在滞留层上方建立起泡沫状态，而在去夹带层的其余部分形成膜流。三明治包装的正确设计需要能够考虑所有这些不同方案的传质模型。在这项工作中，基于比率的概念用于开发夹心填料的传质模型。该模型使用两个备用列段。其中之一对应于去夹带层，在这里，应用了填充柱的传质相关性。另一个部分与保持层有关;它与筛板塔的相关性进行了描述。所开发的传质模型已通过三明治包装的实验效率数据进行了验证。 （C）2015 Elsevier B.V.保留所有权利。

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