Description; Overview Of Operation; Drying; Regenerating - Parker PNEUDRI MXLE Guia Del Usuario

2 Description

2.1 Overview of Operation

The MXLE dryer operates on the Pressure Swing Adsorption (PSA) principle to produce a continuous stream of clean dry air. Dual chamber
columns, filled with desiccant material, are capped by an upper and lower manifold to produce a two bed system (A + B). One side of the dryer is
online drying whilst the other side of the dryer is being regenerated through vacuum assisted pressure swing adsorption technology as described
below.
Side A
Side B

Drying

2.1.1 DRYING
Adsorption Drying (Side A on-line)
Compressed air enters the dryer at the lower manifold and is directed to the online bed by the inlet flow control valves. As the compressed air
flows over the desiccant material, water vapour transfers from the wet air to the dry desiccant. The clean dry air flows into the to the upper
manifold, via the outlet check valves, and exits the dryer.
The process air continues to be dried by Side A of the dryer until the adsorption capacity of desiccant has been used.
Each side of the dryer remains in the drying phase for one fixed half cycle (180 seconds), although this may be extended as the dryer is fitted with
the Energy Management System (EMS). Refer to section 2.2..

2.1.2 REGENERATING

Depressurisation (Side B off-line)
The inlet control valve and the outlet check valve are closed and
remain so whilst Side B is undergoing regeneration. The
exhaust valve is open allowing the air held within the Side B of
the dryer to be vented to atmospheric pressure.
The vacuum pump valve remains closed until the pressure
inside column B has reached atmospheric pressure. This avoids
pressurising the vacuum pump and prevents damage.
Wet Air In
Standard Drying and Regeneration Cycle
Depressurisation
Wet Air Valve Open
Time (Seconds)
Regeneration
Online
Valve Closed
Repressurisation
Dry Air
Energy Saving (DDS)
Exhausting
Dry Air Out
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