Airro Engineering Company

Other Details

Due to dry air purge and thermal regeneration, residual moisture loading on desiccant becomes low and this gives low dew points. The drying unit has 2- vessels filled with activated alumina desiccant. One vessel remains in drying cycle for 4-hours while other vessel is simultaneously regenerated at atmospheric pressure. Around 3 to 5% flow of air dryer capacity is used as purge for regeneration. Electrical heaters are provided in a central finned stainless pipe in drying vessels. Heating cycle is for 2-hours and in this time desiccant temperature increase up to 100 to 150 degree Celsius. at this temperature regeneration is complete. Dew point achieved is around and above (-) 60 degree Celsius. These dryers are some more costly than heat less type but are more suitable for Dew points lower than -60 degree Celsius to -80 degree Celsius and purge loss is also less than the Heat less type i.e. around 3 %.