Heat Compressed air Dryer
Heat Reactivated Dryers
To get compressed
air of very low Dew point of (-)60oC or (-)800 C
then heat reactivated dryers are used. In our range of Internal Heat
Re-activated Dryers design, the desiccant is regenerated at higher
temperature 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 regenerate at atmospheric
pressure. Around 3% flow of dryer capacity is used as purge for
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 100oC. At this temperature regeneration is
complete. Dew point achieved is around (-)40oC. Whenever
lower dew point is required, air purging rate is slightly increased to
5% for (-)60oC and to 7.5% for (-)80oC dew
A Pre-filter with automatic drain valve is used to remove physical
moisture from compressed air before entering air dryer. A micronic
filter is also used in the dryer outlet to arrest any desiccant dust
particles, up to 1 micron size. It provides clean & dry compressed
capacity : 5 to 5000 NM3/ Hr.
Dew point :
(-)40oC to (-)80oC.
Operating pressure : 2 to 50 kg/ cm2g.