Function - Parker Zander WVM Series Operating Manual

Function

The dryer dries the compressed air provided by the compressor and makes it
available for industrial use.
Upstream filters clean the compressed air and remove dust, dirt, oil, and water
droplets, before the compressed air reaches the dryer. Thus, an upstream filter is
also used for extending the service life of the drying agent.
Downstream filters clean the compressed air from drying agent abrasions, before
it is fed into the compressed air system.
The two vessels contain an extremely porous drying agent by means of which
humidity is removed from the compressed air and stored just as in a sponge. The
stored humidity is then removed again from the drying agent and re-introduced
into the ambient environment.
To this end, the two vessels alternate between different operating modes. Whilst
in one vessel, compressed air is de-humidified (adsorption), in the other vessel
the humid drying agent is prepared for another charge (regeneration).
These two states, which run in parallel during compressed air preparation, are
described below.
Adsorption
The humid air is supplied through a compressor
and the inlet valve of the dryer. The compressed
air is then transferred upwards through the
pressurised vessel, where the water contained in
the air is absorbed by the desiccant. The dried
compressed air is subsequently fed into the pipe
system at the top of the dryer.
Regeneration (completed in parallel with adsorption)
The regeneration is subdivided into four phases:
expansion, heating, cooling and pressure build-
up.
With the dewpoint-sensing control option, the
regeneration phase is followed by a standby
phase.
WVM_BASIS_EN_03—07/2016
Adsorption (here: absorption in left
vessel)
The following figures show the
regeneration phases (here:
regeneration in right vessel)
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