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Front-end Noise Abatement Disclosure Number: IPCOM000132291D
Publication Date: 2005-Dec-06
Document File: 1 page(s) / 23K

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Front-end Noise Abatement

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 both 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 switchvalves are used to carry out this switchover as is well known.

When the regenerated bed has been brought online, the saturated bed is isolated. It is then depressurised to atmosphere via a depressurisation switchvalve. The depressurisation is towards the airfeed side of the bed.  A silencer is generally necessary in the depress line. Note that the depress time is usually short, generally resulting in a high initial depress flow. Depending on the allowable noise specification the depress line itself may require some noise insulation. Note that the peak flow and depress energy can be reduced while still meeting the desired depress time by oversizing the depress valve and ramping it open slowly. This would reduce the initial depress flow but increase the later depress flow when the adsorber pressure would be low.

After regeneration the offline bed mus...