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Desiccant Air Dryers

Desiccant Air Dryers
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Regenerative Desiccant Dryers KAD, KED, KBD and Hybritec Series

2 Basic Operation Kaeser desiccant dryers employ the principles of adsorption and desorption to produce a continuous supply of dry compressed air. The activated alumina desiccant has a high surface-to-volume ratio and great affinity for water vapor. The dryer alternately cycles the compressed air flow through twin desiccant towers. As the vapor-laden air enters and flows upward through one tower, the moisture is adsorbed onto the desiccant. While one desiccant chamber is in the drying cycle, the other chamber goes through a regeneration cycle. During regeneration, “purge air” flowing...

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3 Quality Valves Desiccant dryer performance and reliability are driven by component quality. Kaeser dryers are fitted with the most reliable valves and actuators. Designed to hold up under the harshest operating conditions year after year, these leakfree switching valves ensure consistent dew point performance and low pressure drop. Butterfly valve with rack and pinion actuator, KED and KBD dryers Direct acting solenoid switching valve Nylon shuttle valve of KAD series Desiccant Selection All Kaeser desiccant dryers use spherical activated alumina desiccant for adsorption. Activated...

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1 4 5 9 5 4 6 3 2 7 8 6 Outstanding Features Controls and instrumentation • Tower pressure gauges • Tower status lights • Switching failure alarm* • Purge flow indicator • NEMA 4 electrical enclosure • RS232 comm port* *Not available on KAD E 1 Standard moisture indicator • Color change indicates elevated outlet dew point 2 Standard purge flow valve • Offers convenient purge rate adjustment 3 Separate top fill and bottom drain ports • Easy desiccant replacement 4 ASME stamped pressure vessels rated for 150 psig at 450°F 5 Standard stainless steel support screens and air diffusers • Located...

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5 KAD Inlet Pressure Correction Factor (Table 2) Inlet Inlet Pressure Multiplier Pressure Multiplier (psig) (psig) 60* 0.65 130 1.12 70 0.74 140 1.16 80 0.83 150 1.20 90 0.91 175 1.29 100 1.00 200 1.37 110 1.04 225 1.45 120 1.08 250 1.52 ISO 8573.1 Class Dew Point Remaining Moisture** Cycle Time and Mode ppmw mg/m3 Standard with Optional Purge Saver# 1 -100°F (-73°C) 0.12 0.16 4 min. fixed N/A 2 -40°F (-40°C) 10 14 10 min. fixed Yes 3 -4°F (-20°C) 81 110 16 min. fixed Yes 4 +38°F (+3°C) 611 823 24 min. fixed Yes All Models (E and PS) Inlet Flow @ 100 psig Purge Rate @ 100 psig2 (scfm)...

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6 1 8 5 2 5 4 6 7 7 8 6 6 5 5 3 1 2 Outstanding Features Controls and instrumentation • Tower pressure gauges • Tower status lights • Switching failure alarm • Purge flow indicator (KED only) • NEMA 4 electrical enclosure • RS232 comm port Standard moisture indicator • Color change indicates elevated outlet dew point Non-lubricated inlet and purge control valves standard • Requires less maintenance • Long lasting Standard pressure relief valves • Meets ASME Section VIII Standard stainless steel support screens and air diffusers • Located at top and bottom of each vessel • Easy to remove and...

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8 Controls and Instrumentation Heatless Desiccant Dryers Standard Control (KAD) The standard controller with its process flow schematic and LED’s makes status checks of control sequence, valves and filters simple, and allows the user to program reminders for routine maintenance intervals. A diagnostic mode steps through the dryer’s operational sequence to verify proper function and performance. The display clearly notifies the user if a malfunction occurs. This controller has four fixed cycle operating modes corresponding to ISO 8573.1 air quality classes for moisture content. In addition,...

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9 Externally Heated Desiccant Dryers Optional Controls Standard Control (KED and KBD) The standard controller for heated dryers operates the dryer on a fixed eighthour cycle. A tower is on-line (drying compressed air) for four hours and then taken off-line to be regenerated during the remaining four hours. Heater operation is terminated when temperature sensors detect that desiccant bed heating is complete. The standard controller’s process flow schematic and LED’s make status checks of control sequence, valves and filters simple, and allow the user to program reminders for routine...

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10 Hybritec Combination Dryer This innovative compressed air drying solution combines the energy savings of a refrigerated dryer with the exceptionally low dew points of a desiccant dryer. Hybritec units operate on a simple premise: air is first treated by a refrigerated dryer to remove the majority of the air’s water vapor. Then the air is treated by a desiccant dryer to further reduce the dew point. Finally, the air is returned to the refrigerated dryer to be reheated and delivered to the air system. The advantages of these hybrid dryers over other dryer types include: a consistent outlet...

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11 Options Filtration Insulation for heated desiccant air dryers (KED and KBD) Insulation with protective jacket for heater and heater discharge piping is standard; however, insulation for the desiccant vessels is optional. Vessel insulation offers protection for personnel and reduces operating costs. Vessel insulation is flexible open-cell melamine foam having a permanently bonded PVC film laminated polyester fabric jacket. This insulating system absorbs impacts and returns to its original shape thus maintaining its insulating qualities. Other options • High humidity alarm • Dew point...

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The Air Systems Specialist We strive to earn our customer’s trust by supplying high quality Kaeser air compressors and related compressed air equipment. Our products are designed for reliable performance, easy maintenance, and energy efficiency. Prompt and dependable customer service, quality assurance, training, and engineering support contribute to the value our customers have come to expect from Kaeser. Our employees are committed to implementing and maintaining the highest standards of quality to merit customer satisfaction. We aim for excellence in everything we do. Our engineers...

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