Technical product description
HDK350_EN_01_2005-05-10
19
Function description
The dryer dries the compressed air supplied 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
Via a compressor, humid compressed air is supplied to the upstream filter. From
here, the compressed air flows upwards through the absorption vessel, which is
pressurised. In so doing, the drying agent dehumidifies the air. The dry
compressed air is supplied to the pipe network via the downstream filter.
Regeneration (running in parallel to the adsorption)
At the same time the other vessel is prepared for a renewed take-up of humidity.
This process is called regeneration.
The regeneration is subdivided into three phases: expansion, dehumidification,
and pressure build-up.
With the
dewpoint-sensing control
option, the regeneration phase is followed by a
standby phase.
Expansion phase
During the expansion phase the pressure in the right vessel is released via the
muffler down to ambient pressure within just a few seconds.
The outflow of the
compressed air becomes noticeable due to
a sudden powerful flow noise at the
muffler.
Dehumidification phase
Prior to being released into the pipe network, dried compressed air is bled by
means of an orifice plate. This separate regeneration air flow is fed through the
depressurised vessel. The humidity stored in the drying agent is taken up by the
air flow and expelled into atmosphere via the muffler.
Summary of Contents for HDK 50/100
Page 1: ...High Pressure Dryer HDK 50 100 600 350 Operating Instructions Issue 05 2005 EN...
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