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- W2296950437 abstract "Industrial scale multilayered oxygen vacuum swing adsorption units are characterised by a severe axial temperature profile (cold spot) that can have a deleterious effect on the overall performance of the technology. This industrial problem has been recognised for some time now, however remains poorly understood. This paper outlines an approach to better understand and predict the evolution of the cold spot using a technique based on a multiple time scale decomposition of the temperature into two components. The cyclic adsorption process is characterised by two time scales that both contribute to the axial temperature profile in the adsorption bed. The fast time scale temperature profile is caused by cyclic adsorption and desorption of nitrogen with associated heating and cooling of the molecular sieve. The combined period for the adsorption and desorption steps is approximately one minute. The evolution of the slow time scale temperature profile is principally caused by the convection of gas through the bed and the convergence to cyclic steady state is approximately a thousand times slower than the fast time scale. These very different time scales result from the ratio of the thermal capacitance of the gas to the thermal capacitance of the solid. This enables the decoupling of the energy balance into two parts. The fast time scale component of the energy is simply the heat of adsorption/desorption. The fast time scale component can be solved independently of the slow time scale. This paper demonstrates that the benefits of this solution strategy are twofold. Firstly, the approach provides important physical insight into the nature of the evolution of the cyclic steady state temperature profile in the oxygen vacuum swing adsorption process. The results are shown to be consistent with experimental results and full numerical simulation. Secondly, through decoupling the components of the temperature profile significantly faster numerical solutions are possible." @default.
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- W2296950437 date "1999-01-01" @default.
- W2296950437 modified "2023-09-23" @default.
- W2296950437 title "Thermal effects in oxygen vacuum swing adsorption - an accelerated approximate solution" @default.
- W2296950437 hasPublicationYear "1999" @default.
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