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Intake

To Drain

To Drain

Dryer

(Optional) Prefilter

To Drain s

(Optional) Afterfilter r-TV nj»

Dry Air Discharge

Compressed A'r Drying System Deliquescent Dryer

Compressed Air Drying System Refrigeration Dryer

Compressed Air Drying System Desiccant Regenerating Dryer

Receiver

To Drain

To Drain

To Drain

Fig. 30-21 Typical Flow Diagrams for the Three Basic Types of Air Drying Systems. Source: Compressed Air and Gas Institute

Multi-staging, or the connection in series of two or more identical compressors, is often used to limit the pressure rise per stage based on the limitations of the machine type, i.e., axial thrust load in centrifugal compressors, piston rod stress in reciprocating compressors, and rotor deflection and thrust in rotary compressors. Intercooling is the removal of heat from the air between stages to maintain safe discharge temperatures and improve overall compression efficiency. Intercoolers are typically water-cooled tube bundles with an external means of heat rejection (e.g., cooling tower or once-through city water cooling). Ideal intercooling exists when the temperature of the air leaving the intercooler equals the temperature of the air at the intake of the first stage. In practice, the benefits of intercooling are also partially offset by the pressure drop across the cooler and by the mechanical losses consumed in driving the stages.

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