CONCEPTUALLY NEW MODEL OF PRESSURE SWING ADSORPTION
Keywords:Pressure swing adsorption, PSA, Adsorption, Oxygen, Nitrogen
The paper describes a new mathematical model of pressure swing adsorption (PSA) in terms of a set of concentration waves passing through an adsorbent bed. An analytical solution for the passage of the concentration eigenwaves through the arbitrary adsorbent bed is derived. This makes it possible to find analytical solutions for an arbitrary shaped concentration signal passing through the adsorbent bed. To do this, it is necessary to decompose the input concentration signal into a set of adsorbed layer eigenwaves and obtain a solution for each of the concentration eigenwaves at the exit of that adsorbed layer. Then, all the concentration eigenwave solutions are combined. This is the solution to the problem of passing an arbitrary concentration signal through the adsorbent bed. This approach is suitable for any periodic adsorption process and allows to take into account the variable concentration of the components at the entrance of the adsorption layer and the non-stationary diffusion in the adsorbent grain. The wave approach to the analysis of periodic adsorption processes provides an explanation of the effective operation of PSA units. The analysis of the obtained solutions for PSA units designed for production of oxygen from air is provided. The conditions necessary for highly efficient operation of PSA units are formulated. The results of the calculations for different brands of zeolites are given, which allow to optimize the choice of zeolite for the set working conditions.
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