Twin Tower Decadent Air Dryer BD 100+-300+ Aluminum Alloy Heatless

ATLAS COPCO BD 100+-300+ 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 Copco 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).

BD 100+-300+
Premium performance& cost-efficiency

1 Quality desiccant

• High adsorption silica gel desiccant needs less reactivation energy than other drying agents.
• Dual-layer desiccant bed with a water-resistant bottom layer protects the high-performance top layer.
• Pressure dew point of -40°C/-40°F as standard (-70°C/-100°F optional).
• Up to 30% extra desiccant to deliver consistent performance even in harsh conditions such as high temperatures and temporary overloads.

2 Stainless steel valves
High-performance stainless steel butterfly valves with actuators ensure a long lifetime.

3 Low wattage density heater
• Stainless steel design extends lifetime.
• Heater is installed in an insulated pipe for an energy-efficient set-up.
• Insulated vessels are available as an option to further reduce heat losses and increase overall efficiency(standard on the -70 °C/-100 °F model).

4 Galvanized piping with flanged connections
• Flanged piping simplifies maintenance and minimizes the risk of leaks.
• Pipe sizing is optimized to ensure a low pressure drop for maximum energy savings.

5 Filters
• A pre-filter prevents oil contamination to increase desiccant lifetime.
• An after-filter protects the airnet from desiccant dust and network contamination.
• Can be mounted directly on the inlet and outlet of the dryer for low pressure drop.
• Easy to assemble and maintain. No extra piping and filter connections are required.

6 Advanced controland monitoring system
• Fitted inside an IP54 cubicle for easy cabling and safety.
• Monitors all parameters to ensure maximum reliability.

7 Dew Point Dependent Switching
• Real pressure dew point monitoring (hygrometer).

• Pressure dew point (and alarm).
• The dryer will only switch to the next tower when the desiccant is saturated, as measured by the dew point sensor. During this cycle time extension, the dryer consumes no purge air, resulting in a significant reduction in energy use.

8 Robust and compact design
• Standard frame, including forklift slots and lifting eyes for easy handling.
• Wide vessels ensure a low air speed and a longer contact time.
• Flanges connecting the vessels are integrated into the top and bottom shells, lowering the total unit height.

Technical Specifications

Technical Specifications

Reference conditions BD + : Performance data per ISO 7183:2007.
Compressor air inlet temperature: 35°C/100°F.
Inlet relative humidity: 100%.
Reference conditions BD + ZP (Zero Purge):
Performance data per ISO 7183:2007.
Ambient air temperature: 25°C/77°F.
Ambient air relative humidity: 60%