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Hi All,

I'm working on the designing of Heat-Less type gas drier using Pressure Swing Adsorption . We have a experimental setup as well with following parameters--

Input gas Moisture: RH 90% at 10 Bar absolute
Working Pressure: 10 Bar
Adsorbent: Alumina
Designed flow rate: 25 NM³/Hr
Target Dew Point: -55⁰C

Plant is working fine at designed capacity..........but I'm unable to find the reason behind a phenomenon occurring in our experimental setup........which is as we decrease the Flow Rate below designed capacity keeping all other parameters as constant...........moisture removal capacity decreases.

I've gone through a lot of theory and designing process, there are mutually dependent parameters such as decreasing flow rate....decrease superficial velocity which in turn decrease mass transfer coefficient..........decreasing flow rate increases retention time which increase mass transfer efficiency

what could be the exact reason for this.............please help

Thanks in anticipation

Edited by amit_21680, 04 August 2012 - 10:14 AM.