Operating Manual LUXOR S 400

LUXOR S 400
Structure and function 5
The drying process
The dry air generation uses a two cartridge system to continually remove humidity from the hygroscopic
plastic granulate down to a residual humidity of 0.02 % or less.
Both drying agent cartridges [7, 11] compliment each other in their function: While one drying agent
cartridge dries out the returned air, the other drying agent cartridge regenerates.
Drying
The dry (process) air blower [9] pulls in humid return air through the upstream dry air filter [13] from
the drying hopper [16] containing the plastic granulate to be dried . The blower pushes the return air
through the bottom switching valve [8] to the drying agent cartridge 2 [11]. The drying agent (adsorption
agent) within draws out the humidity from the air. The dried air, now called dry (process) air,
passes through the top switching valve [5] back into the drying hopper [16] and remains there for drying.
Regeneration
At the same time, the drying agent cartridge 1 [7] is subject to a regeneration process, until the saturated
drying agent is regenerated. The regeneration air blower [10] pushes air, called regeneration
air, through the regeneration circuit to the regeneration air heater [6]. The regeneration air, which has
been heated to 250 °C (480 °F), flows through the drying agent cartridge 1 [7], thus regenerating the
drying agent by the regeneration air taking up the humidity within the drying agent. Humid regeneration
air is drawn off to the normal air via the regeneration air heat exchanger [4]. At the same time,
the regeneration air blower [10] pulls in normal air from outside. The regeneration air heat exchanger
[4] warms up the normal air, before it enters the regeneration circuit.
Cooling
After regeneration with hot regeneration air, the temperature of the drying agent cartridge 1 [7] is too
high to be able to be used for drying. Therefore, the regeneration circuit must be cooled after regeneration
of the drying agent. The regeneration air heater [6] switches off as soon as drying agent cartridge
1 [7] has reached the "regeneration" reference temperature. Now, the regeneration air/cooling
air circuits [15] short circuit the regeneration circuit, and the connection to normal air is interrupted.
This offers the advantage that no humidity can enter the regeneration circuit from the normal air. The
regeneration air flows in a closed regeneration circuit through the regeneration cooler [14] and cools
the regeneration circuit to the "cooling" reference temperature.
Should the cycle time for drying agent cartridge 2 [11] not yet have been reached, the fan and the
regeneration air blower [10] switch themselves off. Only when the cycle time for drying with drying
agent cartridge 2 [11] has elapsed does the system switch: drying agent cartridge 2 [11] regenerates,
drying agent cartridge 1 [7] dries.
Edition: August 2005 27