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6 PSA process dynamics 74 Fig. 6-2 Mass transfer coefficients during the PSA reference cycle at 1000 ppm O2 at selected positions of adsorber length: (a) MTC of oxygen; (b) MTC of nitrogen; here nodes 1, 35, and 70 indicate the bottom, the middle, and the top of the column, respectively; here time ranges of 0 – 60 s and 60 – 120 s indicate production and regeneration steps, respectively For both of the components, no notable difference in the average value of mass transfer rates during adsorption and desorption is observed. The finding confirms experimental results presented by Möller et al., showing that the uptake rate during adsorption equals the uptake rate during the desorption [106]. In the bottom section of the adsorber column, a larger mass transfer rate is associated with oxygen rather than nitrogen; despite its significantly lower concentration in the gas phase. In the middle and top sections of the adsorber column, the rate of nitrogen transport dominates. Moreover, it appears in Fig. 6-3 that the oxygen transport occurs very rapidly, while the nitrogen is transferred steadily. Tab. 6-1 Average mass transfer rates of oxygen and nitrogen during the PSA reference cycle at 1000 ppm O2 at selected positions of adsorber length ∂w/ Adsorption Desorption Adsorption Desorption Node 35 1.402 × 10-6 -1.113 × 10-6 3.370 × 10-6 -3.432 × 10-6 ∂t (average)[kmol/kg/s] Oxygen Nitrogen Node 1 3.541 × 10-6 -3.688 × 10-6 2.380 × 10-6 -2.414 × 10-6 Node 70 2.730 × 10-8 -2.585 × 10-8 3.471 × 10-6 -3.535 × 10-6PDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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