Page 59 - Pneumatic ebook (2)_draft 13 sept 2021

Air dryer - absorption

a. Absorption (deliquescent) Drying

1. The compressed air is forced to enter through a desiccant
which has dehydrated chalk or magnesium chloride that
remains in solid form. Lithium chloride or calcium chloride
reacts with moisture to form a solution, which is discharged
from the bottom of the container.
2. During operation, the dew point of the desiccant will increase
with the consumption of salt, but a pressure dew point of 5°C
at 7 bar is possible. Thus, desiccant must be replenished
regularly.

3. The main advantage of this method is the low initial and
operating costs, but the inlet temperature should not exceed
30°C. Since the chemicals used has high corrosive
characteristics, it has to be carefully monitored and filtered
absorption air dryer so that small corrosive mists does not enter into the
pneumatic system.

INTRODUCTION TO PNEUMATIC SYSTEM 25