Air Dryers Review Flashcards
True or False;
Chemical type absorption dryers can be regenerated:
false
What are the four main categories of Air Dryers?
Adsorption
Absorption
Cooling
Mechanical
Desiccant dryers may use __________ to take moisture from the gas/air.
Silica Gel
Activated Alumina
Molecular Sieves
True or False;
In absorption dryers, switching valves are used to route the flow of air/gas through the drying and reactivation cycle.
False
ADSORPTION
Condensation does not occur within a compressor because:
Increased temperature enables the air to hold more moisture.
The saturation point of air will vary with changes in:
pressure and temperature
A physical attraction of water vapour to the surface of a porous substance describes a(n) _________ dryer.
Adsorption
The greatest dew point reduction can be achieved using:
Desiccants
True or False;
Air or gas at a constant temperature will be able to hold less moisture as the pressure increases.
True
True or False;
In absorption dryers the chemical reaction results in a liquid becoming a solid.
False
-solid to liquid
salt to brine
Refrigerant air/gas dryers can be divided into two main parts:
Air to Air circuit
Refrigerant to Air circuit
The amount of moisture actually contained in the air compared to the maximum amount that the air could hold refers to:
Relative Humidity
True or False;
Lubricants used for valves on heated regeneration dryers must be suitable for high temperatures:
True
its in the name ‘heated’
High differential pressures across a desiccant dryer could be caused by:
The desiccant bed being compacted
Excessive inlet air/gas flow rates through a chemical dryer will result in:
the air/gas having inadequate time with the deliquescent
Poor dew points on a regenerative type dryer could be caused by:
High temperature of the desiccant bed
Poor cycling
Flow rate too high
The heated regeneration desiccant dryer should be monitored to verify that it cycles through:
drying, reactivation, cooling
Reactivation of a desiccant dryer is normally accomplished by:
Heating the desiccant
Routing part of the flow through the desiccant
Failure of switching valves to move during cycle changes can result in:
Inadequate reactivation
Saturation of the drying bed
Possible stoppage of gas flow
Demister pads are commonly used at the:
Exit of Process Vessels
What is often found in the line before an air dryer to help reduce the load on the dryer?
Cyclonic Separator
True or False;
Cyclone separators are most often found before the compressor aftercooler.
False
most often after
