Modelling of Maldistribution in Structured Packings: From Detail to Column Design

摘要

The aim of the thesis was to determine the origin and extent of both small scaleand large scale maldistribution in corrugated sheet structured packings and to develop a complete predictive model for hydraulic and separation performance of industrial scale columns. MONTZ-PAK B1-250 and RALU-PAK 250 YC were chosen out of many types of corrugated sheet structured packings as representatives of two extremes with respect to surface design. The first one has a shallow embossed surface without perforations while the second one has jalousie-like openings which makes it highly permeable for both phases. A discrete cell model was used as basis for modelling of gas and liquid spreading. A cell size corresponding with the hydraulic diameter of the packings tested was chosen to incorporate small scale maldistribution effects. The calculated local liquid and gas loads enable predicting of the separation efficiency using a local equilibrium stage approach.