PHD Series Dryers Reduce Purge Air Energy Cost

PHD Series is engineered to deliver ISO 8573. Air Quality and reduce purge air consumption. In combination with the advanced Ambient Air Amplification (A3) Purge Technology. It offers externally heated purge desiccant dryers with dew point performance guaranteed from 300 to 3,200 scfm.

PHD Series dryers are designed to address. ISO 8573.1 dew points between Class 2 and Class 3 are delivered automatically with the standard design. Class 2 (-40 degree F) dew points protect usage points from freezing during winter. Class 3 (-4 degree F) dew points keep air systems nice and dry all summer long. Applications that require Class 2 (-4 degree F) dew points year round simply need to select the Jet Injection option Package.

Standard Design

Moist, filtered compressed air enters the pressurized on-line desiccant-filled drying Tower 1 through valve (A). Up-flow drying enables the desiccant to strip the air stream of moisture. Clean, dry compressed air exits through valve (E) to feed the air system. Tower 2 (when in regeneration mode) closes valve (B), then depressurizes to atmosphere through muffler (C). Valve (D & G) open and the heater turns on. A portion of dry compressed air (purge air) is diverted before exiting (E) and passes through the heater. Hot dry purge air desorbs the moisture from the desiccant as it flows down through Tower 2 to exit at valve (D). Once desorbed, the heater turns off and cool dry purge air continues to pass until the desiccant bed is cooled. Finally valve (D) loses and Tower 2 is repressurized. At a fixed time interval, valve (B) will open and Tower 2 will be placed on-line to dry and valves (A & D) will close. Operations will switch and Tower 1 will be regenerated.

Jet Injection Option Package

Jet Injection manages drying and regeneration cycles with precision for systems with variable air demand. The on-line tower will continue to dry the air stream until the "moisture front" is detected. Only then will the switchover sequence begin. In regeneration mode the Jet Injection is engaged an a portion of dry purge air exits valve (F) to be injected into the Y axis of the Jet Injection. A3 purge technology draws ambient air into the X axis to desorb the desiccant at better than 1:1 amplification. Sensors detect the retreat of the moisture front, disengage the Jet Injection, eliminated the purge air usage and, initiates the repressurization cycle. The dry, pressurized off-line Tower will remain ready and isolated until sensors detect that the on-line drying tower is saturated. Then the switchover will occur and the process will repeat