HEATLESS REGENERATIVE DRYERS | CHD SERIES | 40–5,000 CFM
Principle of Desiccant Operation The Next Air & Gas twin tower design allows for continuous adsorption of water vapor from compressed air by using our high-quality, domestically made desiccant with high crush strength and a high surface/volume ratio. Drying is accomplished by passing compressed air through one desiccant bed adsorbing moisture while the other is being simultaneously regenerated with the expanded purge air. Regeneration of desiccant is accomplished without the use of heat. The wet bed is dried by diverting a small portion of the dry air from the outlet at near atmospheric pressure. The purge flow rate is adjustable to suit the specific outlet conditions (desired dewpoint). The dry air flows in a counter direction through the wet bed, sweeping all the water vapor previously adsorbed by the desiccant. The digital controller monitors the automatic operation of the dryer and provides options for load management, fixed cycle and dewpoint-based control. Next Air & Gas ensures pressure equalization in the twin towers prior to switching. This prevents line surge and minimizes desiccant attrition. The tower being reactivated will be gradually re-pressurized at the end of its reactivation cycle before switchover takes place. Purge flow and de- pressurization are in downward direction, counter flow to the drying air flow.
Standard Features • UL and CUL electrical certifications • ASME, CRN code welded pressure vessel certification • Stainless steel angle body valves/butterfly valves • Optimal tower size for low velocities, high contact time and minimal desiccant fluidization • Tower pressure relief valves • Purge adjustment valve to control purge flow • Purge flow indicator indicates rate
• Purge exhaust mufflers with built-in safety valve • Tower pressure gauges • Stainless steel desiccant strainers, supports air diffusers to prevent channeling • Counter-current repressurization • Nema 12 electrical enclosure • Separate drain and fill port • Separate safety pressure relief valve for each tank • Fail-safe design in case of power failure • Common alarm contact
• Filtration Package • Mounted Pre & After Filter • Mounted Pre & After Filter with 3-valve Bypass • Mounted Dual Pre & After Filters with 9-valve Bypass • Touchscreen HMI 4” Controller Optional Features
• High Pressure (200 – 300 PSI) • NEMA 4, 4X, or 7 • Failure to Switch Alarm • Stainless Steel Tubing • Demand Cycle Control with Dewpoint Display • Low Ambient Package
Consult factory for additional options
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