A New Numerical Method for Accurate Simulation of Fast Cyclic Adsorption Processes |
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Authors: | Hyungwoong?Ahn Email author" target="_blank">Stefano?BrandaniEmail author |
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Institution: | (1) Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK |
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Abstract: | In the simulation of fast cyclic adsorption processes, to apply the Fickian diffusion model it is necessary to include an
increasing number of numerical discretization points as the cycle time is reduced in comparison to the characteristic diffusional
time constant.
We propose a new numerical method based on the definition of two distinct regions within an adsorbent particle: an outer layer
where the concentration varies significantly with large internal gradients leading to enhanced mass fluxes, and an internal
region where the concentration profile is virtually flat. The proposed method leads to the automated generation of a numerical
grid that has a constant number of elements independent of the process cycle time. The procedure is demonstrated on a model
for the simulation of a heatless dryer pressure swing adsorption process. |
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Keywords: | diffusion model adsorption numerical simulation cyclic adsorption processes |
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