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Pre-filteration: The moisture laden compressed air passes through the pre filter. Here moisture load is reduced through coalescence. Condensation is removed through the drain valve ADV1. At the oil filter, oil vapours are removed completely and a small level of water condensation is purged through the valve ADV2.
Drying: (Please refer figure) The Towers are filled with Activated Alumina as desiccant (Molecular sieve available as option). When air passes through Tower 1 which consists of “DRY” Desiccant, it gets completely dried, and passes through the check valve and the after filter. At the after filter, Desiccant fines are removed. Therefore, dry compressed air passes out at the outlet.
Regeneration: Regeneration takes place in 2 stages a) De-pressurisation b) By passing Dry air. Tower II consists of fully moist desiccant in pressure. This is suddenly De-pressurised by opening the purge valve. Water molecules seep out of the desiccant and appear on the surface. “Super Dry” purge air passes through the Regeneration “Nozzle” and the desiccant bed thereby completely carries away the water molecules. Tower II gets regenerated and is ready for the next drying cycle after the re-pressurisation.
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Coldspell HP Series High Pressure Refrigerated Compressed Air Dryer