Heatless Desiccant Air Dryers
Drytec MDA Heatless Desiccant Air Dryers provide constant –40°C pressure dew point.
These Dryers are designed to supply clean and dry compressed air for critical applications.
Pre-filters and after-filters are supplied with Drytec Heatless Air Dryers to keep the air clean and
maintain the integrity of the desiccant medium.
A reliable electronic controller makes sure that the dryer operates perfectly.
MDA Heatless Desiccant Dryers are equipped with special valves and desiccants in order to
have a good performance and one of the lowest pressure drops available in the Market.
Principle of Operation
The twin tower are designed for continuous absorption
of water vapor from compressed air by using the
hygroscopic desiccant with high crush strength and a
high surface / volume ratio. To be dried, compressed
air pass through one desiccant bed which absorb
moisture, while the other one is being simultaneously
regenerated with the expanded purge air. To
regenerate the desiccant, the use of heat is
unneeded. The wet bed is dried by diverting a
small portion of the super dry air from the outlet
at atmospheric pressure. The purge flow rate is
adjustable to suit the specific outlet conditions
(desired dew point). The super dry air flows in a
counter direction through the wet bed, sweeping
all the water vapor previously absorbed by the
MDA ensures pressure equalization in the twin
towers before the switching. This prevents line
surge and minimizes desiccant attrition. The
reactivated tower will gradually be re-pressurized
at the end of its reactivation cycle before switchover takes place. Purge flow and de-
pressurization are in downward direction, counter flow to the drying air flow.
PLC is standard
MDA Desiccant Dryers has a very
reliable electronic controller which
makes sure that the dryer operates.
Touch screen PLC is able to show
the cycles as well as the valves
which operate on real time. It also
shows the dew point (if
applicable). User friendly multi-
lingual PLC helps the users to
understand the operation system
Drytec uses absorption media in its heatless range of desiccant
dryers to achieve consistent dew point. Activated Alumina,
Molecular Sieve and Silica Gel are used in varying ratios
depending on the application.
Ordering : If a compressor delivers 850 Nm³/h at 9 bar
pressure and 45°C inlet temperature, the
selection will be as follows :
850 x 1.25 x 0.73 = 931 Nm³/h
The correct dryer is MDA1000
Drytec MDA heatless desiccant dryers provide constant –40°C (-70°C is optional) pressure dew
point. These dryers are designed to supply clean and very dry compressed air for critical applica-
tions. Pre-filters and after-filters are supplied along with Drytec heatless air dryers to keep the air
stream clean and maintain the integrity of the desiccant medium.
Drytec S.A. Rue de Clérembault, 17 B-4031 Angleur Tel: +32 43675243 Fax: +32 43670805 [email protected]