Air compressor desiccant dryer
Heat Reactivated Type Air Dryers are used when one needs compressed air of very low Dew point of (-) 60°C or (-) 80°C. In this design, the desiccant is regenerated at higher temperature, along with small quantity of Dry air purge. Due to purging with Dry air and thermal regeneration, residual moisture loading on desiccant becomes low and this gives very low Dew point. The Drying unit has 2-vessels filled with Activated Alumina or Molecular sieves desiccant. One vessel remains in drying cycle for 4 hours, while other vessel is simultaneously regenerated at atmospheric pressure. Around 3% flow of dryer capacity is used as purge for regeneration. Electrical heaters are provided in a central finned Stainless steel pipe in both drying vessels. Heating cycle is for 2 hours and in this time hot purge air increases desiccant temperature to around 100°C. At this temperature regeneration is complete (due to dry air purge). Dew point achieved is around (-) 40°C. If still lower Dew point is required, air purging rate is slightly increased to 5% for (-) 60°C and to 7.5% for (-) 80°C Dew point. SAM Gas Filters A Pre-filter with automatic drain valve is provided to remove any physical moisture from compressed air before entering Air dryer. A microcin filter is also provided in the Dryer outlet to arrest any desiccant dust particles, up to 1 micron size.
Protecting your systems and processes
Desiccant air dryers provide the ultimate in energy efficiency and supply extremely low dew point
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In Heatless Air Dryer two adsorber towers filled with Activated Alumina / Molecular Sieves to absorb the moisture present in the wet compressed air. Wet incoming compressed air or gas is passed through an adsorber tower where moisture is adsorbs to achieve better dew point.The dry air comes through the top of tower. After some time of operation activated alumina needs regeneration. Reactivation or regeneration of activated alumina is necessary to drive off the adsorbed moisture and to restore its absorptive capacity.This is accomplished via purging the adsorbent by dry air or gas at atmospheric pressure and temperature in reverse direction. The purge loss in around 10% of dry air. Changeover will take place through PLC/timer and continuous dry air will be received at outle
