PNEUDRI - Air Energy Management

PNEUDRI OperationDrying of Compressed AirAdsorption dryers work on the principle of moisture always migrating to thedriest medium possible. Therefore, water vapour is removed from compressedair by passing it over an adsorbent desiccant material.As the air contacts the adsorbent material, water vapourtransfers from the wet air to the dry desiccant, however,adsorbent materials have a fixed adsorption capacity andonce this capacity is reached, they must be regeneratedor replaced.Therefore, to provide a continuous supply of clean, drycompressed air, adsorbent dryers utilise two chambersof desiccant material and at any one time, whilst onechamber is on-line, drying the incoming compressed air,the other is either off-line, being regenerated or isre-pressurised, ready to come on-line. All adsorptiondryers remove water in this manner.The energy consumed by an adsorption dryer can bedirectly attributed to the method used to regenerate theadsorbent material. Parker domnick hunter PNEUDRIdryers utilise either the Heatless PSA or the HeatRegenerative TSA method to regenerate the adsorbentmaterial.PNEUDRI Operation - Drying CycleThe process air enters the dryer throughthe inlet and is directed into the on-linedrying chamber via the inlet valves andlower manifold.(PNEUDRI models can be made up ofeither single or multiple drying columns,depending upon the range)The air is evenly distributed through thedrying columns and passes over thedesiccant material, reducing the watervapour content.The dried process air then combines in theupper manifold and exits the dryer via theoutlet check valves.Dry AirDesiccantbeadWet AirColumn ChangeoverBefore the on-line (drying) and off-line(regenerating) columns change over, thedryer exhaust valve, is closed, allowing thepurge air to re-pressurise the off-linecolumns. This ensures a consistent systempressure and dewpoint when the dryingchambers change over.7