Great Lakes Air Products GPS-500 Manuale di istruzioni - Pagina 6

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OPERATION

The operation of a GPS dryer is fully automated with

all sequencing and function controlled by an

automatic

timing

module

programmable

controller.

Wet and dirty compressed air discharged from the

compressor

enters

the

aftercooler,

where

the

compressed air temperature is reduced to near

ambient. The entrained liquids are released, and then

removed by a separator. The coalescing pre-filter

then removes any liquid moisture carryover present

after the separator. The compressed air still saturated

at the reduced temperature, but not containing any

gross liquids enters the regenerative dryer.

The saturated compressed air enters either the right

or left tower of the dryer depending on the control

sequence position. For ease of description, assume

the saturated compressed air is entering the right

tower. The compressed air passing through the right

desiccant tower gives up all of its water vapor to the

activated alumina desiccant. This cycle will continue

for 5 minutes on a standard model, or until the vessel

is saturated with the optional Demand Cycle

Controller. For more information on the operation of

the Demand Cycle Controller, refer to that section in

this manual.

While one tower is drying the process air, the other tower is in the regeneration mode. The

regeneration is accomplished by utilizing a regulated portion of dry compressed air called the purge

stream. The stream is expanded to near atmospheric pressure by passing through an orifice. This

expanded volume of dry air is then passed over the saturated desiccant bed to absorb and carry away

moisture. The now saturated purge stream exits to atmosphere through the left tower purge exhaust

valve and muffler. This process is maintained for 4 minutes and 30 seconds. At the end of this time

period the purge valve closes and allows the purge stream to repressurize the regenerated tower,

preparing it for the next cycle of adsorption. In larger systems, a small solenoid valve opens to assist

the purge stream in the repressurization process.

GPS Heatless Regenerative

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