Compressed air, directly
from Air compressor discharge is taken to Air dryer inlet
through insulated pipelines, at 120oC(minimum)
temperature. This hot air is passed through one drying vessel
where saturated desiccant is regenerated by this hot air.
After picking up moisture from desiccant bed, the air is cooled
in an intermediate cooler. Here moisture is condensed and
removed by auto drain valve. Cooled to 40oC, this
air passes through the second drying vessel where balance
moisture gets adsorbed and Dry air comes out. Cycle time is
4 hours regeneration & 4 hours drying. After 4 hours the
changeover of vessels takes place automatically. In regeneration
cycle heating of the bed is only 2 hours, and thereafter the
bed is cooled by Dry air. After bed cooling, Dry air is again
cooled to 40oC in another cooler, and delivered
out of unit as Dry air at 40oC temp.
The Dryer is fully automatic with pneumatically
actuated Ball/ plug valves. A sequence timer controls operation
of these valves. Desiccant used is Activated Alumina and it
dries the air upto (-)40oC Dew point. |
