ATLAS CD85 DESICCANT AIR DRYERS AIR TREATMENT


How do desiccant dryers work?
Desiccant dryers consist of two towers filled with desiccant. Wet compressed air passes directly through the substance, which adsorbs the moisture. The desiccant has a finite adsorption capacity before it must be dried out. Hence the twin tower design. While one tower is drying air, the other is being regenerated.

Atlas offers two types of desiccant dryers, the BD+ rangeof blower (zero) purge dryers and the CD(+) series of heatless desiccant dryers. The difference lies in their regeneration process.

1. Drying
Wet compressed air flows upward through the adsorbent desiccant from bottom to top (1).

2. Regeneration
Heatless desiccant dryers – CD+:
Dry air from the drying tower outlet is expanded to atmospheric pressure and sent through the saturated desiccant, forcing the adsorbed moisture out (2 and 4).
After desorption, the blow-off valve is closed and the vessel is re-pressurized.
Blower (zero) purge desiccant dryers – BD+:
The blower (5) takes ambient air and blows it across the external heater (6). The heated air is then sent through the saturated desiccant (2), forcing the adsorbed moisture out.

3. Cooling (BD+)
BD+ with purge:
After the heating phase, the desiccant is cooled by expanding dry compressed air from the outlet of the adsorbing vessel over
the hot reactivated tower.
BD+ with zero purge:
After the heating phase, the blower takes in ambient air and sends it through the reactivated tower from bottom to top.
4. Switching
After regeneration, drying switches from the saturated tower to the regenerated tower (3).




CD85 Modular Advanced technology and outstanding performance

1.Advanced technology and outstanding performance
• Atlas Copco's new modular CD+/CD series dryers provide high-quality dry air without pressure vessels, with a pressure dew point as low as -70°C and can achieve the highest water content level 1 standard in the ISO8573-1:2010 compressed air quality standard.

2.Excellent performance
• High quality adsorbent with reliable high adsorption performance, suitable for a variety of working conditions
• CD+ series standard achieves pressure dew point of -40°C and -70°C
• CD series standard achieves pressure dew point of -20°C

3.Optimum solenoid valve
• High-quality solenoid valve to ensure reliable operation of the dryer under different pressure conditions

4.Smart and friendly controller
• LCD controller to monitor operating status,
• Can be synchronized with the compressor to control the compressor switch (loading and unloading) status
• Service and operating time indication and warning.
• Optional dew point control to reduce the loss of purge air (optional dew point control is required).
• Remote control to achieve remote start, stop and alarm

5.Optimized air flow distribution
• Professional fluid mechanics analysis, air flow distribution design, and extended adsorbent service life
• Optimized air flow distribution ensures stable pressure dew point

6.Convenient maintenance and care
• Quickly replace the adsorbent, easy filling, and avoid adsorbent overflow
• Specially designed adsorbent protection device to prevent adsorbent powdering during operation

7.Wide pressure range
• Standard products can be used for 4-10bar, options can be used up to 16bar
• Professional design for different inlet pressures to reduce compressed air loss


Technical Specifications

CD dryer*: Activated alumina, can be used for pressure dew point -20℃ (only CD180/210 optional pressure dew point -40℃)
Pressure description**: Standard machine is recommended for 7~8bar compressed air (limited use range 4~10bar), optional corresponding 4/10/13~16bar purification nozzle to reduce gas consumption

Reference working conditions: Ambient temperature: 25°C
Intake air temperature: 35°C
Working pressure: 7 bar

Extreme operating conditions: Maximum ambient temperature: 46°C
Minimum ambient temperature: 2°C
Maximum air intake temperature: 50°C


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