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Frontend Adsorber Regen Piping Design Disclosure Number: IPCOM000132292D
Publication Date: 2005-Dec-06
Document File: 2 page(s) / 273K

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Frontend Adsorber Regen Piping Design

An ASU (air separation unit) generally uses frontend adsorbers to remove water vapour, and other contaminants (such as carbon dioxide) from the pressurised feedair. Typically two adsorbers are used, one online and the other being regenerated in a countercurrent manner by low pressure wastegas from the ASU.  Usually the adsorbers are configured to have feedair in upflow and regen gas down (although for radial adsorbers these flows are radial). The adsorbers are regularly switched over to bring the regenerated adsorber online and to regenerate adsorber saturated with contaminants. Air and regen swittchvalves are used to carry out this switchover as is well known.

While online the water vapour is first removed by a water adsorbent local to the air inlet. Then the other contaminants are adsorbed from the dried gas. The adsorbent local to the air inlet becomes completely saturated with water vapour. When taken offline this adsorbent is first depressurised to the pressure of the regen gas (generally close to atmospheric pressure). The capacity of the water adsorbent for water vapour is reduced at the lower pressure and therefore some water vapour immediately desorbs and can condense into liquid water. Clearly this liquid water will collect by gravity at the lowpoint of the system. With the adsorber depressurised the regen switchvalves are opened and regen feedgas (which may have been heated) is routed through the adsorber countercurrent to th...