Fluid dynamic design of packed columns

Principles of the Fluid Dynamic Design of Packed Columns for Gas/Liquid Systems... 

The aim of this work is to determine the law of resistance that applies to classic packing elements as well as modern, lattice packings, which are becoming increasingly popular for practical use, and structured packings as well as stacked packing elements and tube columns, in order to perform the fluid dynamic design of packed columns as accurately as possible. 

The law of resistance = f(Rey), see Chap. 3, is the basis for the entire fluid dynamic design of packed columns and for the calculation of the following parameters ... 

Tables 6-la-c contain the numerical values of the model parameters as well as the technical data for approx. 200 various types of randomly filled and stacked packing elements and structured packings. These can be used as a basis for the fluid dynamic design of packed columns according to the model presented in this book.

The most important Hterature references used for developing the model of the fluid dynamic design of packed columns are listed in the following. They refer to individual random and structured packings, see - when not other mentioned - Chap. 4 ... 

The flow chart in Fig. 6-7 shows the procedure of the fluid dynamic design of packed columns. 

FDPAK Programme for Fluid Dynamic Design of Columns with Modem Random and Structured Packings... 

For this reason, the book is aimed at illustrating the basic principles of the fluid dynamic design of columns with modem random and structured packings, using a new design concept which can be apphed to any type of packing. 

This book also takes into account Billet s [15] experimental data on the hydraulic behaviour of packed columns for the development of a new method for the standard presentation of the fluid dynamics of columns with any type of packing design. The basic principles of the method for determining the separation efficiencies of packed columns have already been publicised in joint presentations and individual publications by the author and Billet [16-18]. 

The progress in terms of the accuracy in designing packed columns for gas/hquid and Kquid/liquid system is considerable. The results of this work have led to accurate predictions of the fluid dynamic behaviour of random packing elements, simply based on their geometric form without requiring any chemical engineering tests. 

In most adsorption processes the adsorbent is contacted with fluid in a packed bed. An understanding of the dynamic behavior of such systems is therefore needed for rational process design and optimization. What is required is a mathematical model which allows the effluent concentration to be predicted for any defined change in the feed concentration or flow rate to the bed. The flow pattern can generally be represented adequately by the axial dispersed plug-flow model, according to which a mass balance for an element of the column yields, for the basic differential equation governing llie dynamic behavior,... 

Density and viscosity are important for the process and plant design, especially relating to fluid dynamics calculations for the absorption column, gas-liquid mass transfer resistance and the selection of pumps and packings. The measurement systems were first validated with 30 w1% MEA solutions. As seen in Figure 5, the dynamic viscosity of MEA solutions is significantly increased by the dissolution of CO2 and the measured data agree well with the values predicted from Weiland s correlation [20]. The maximum deviation is less than 3%. 

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