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In the following pages results of computer simulations are shown, based on the
operating options /PAR2/NPE2/DD/DUR/SM/SMEQ and on using high pressure purging.
A number of "snap shots" have been taken during a complete cycle of an adsorber,
of its gaseous phase composition profiles over its full height, at start of
adsorption, after having admitted 40, 60, 80 and 100% of the feed charge and
further at the end of depressurization, dumping, purging, dump return and
repressurization. Please note in the dump gas profile in picture B18 the hydrogen rich part of the dump gas being returned into the system. Further in pictures B14 at the 100% scale and B15 at the 20% scale the repressurization stages are indicated with at each stage the admitted gas quantities including their composition. This repressurization gas profile should be viewed in conjunction with the depressurization gas profile of picture B13. Comparing pictures B8 and B9 reveals the effect of dump return on the gaseous composition profile in the gas receiving adsorber. In addition compostion profiles are given of product gas, product slip gas, secondary product gas, purge gas, dump gas return, net dump gas and purge offgas. The numbers in the diagrams refer to the components specified for the adsorber profiles. |