DESICCANT AIR DRYERS FOR SUPERIOR PRODUCTIVITY
BD300+
The drying process
1 Wet compressed air flows upward through the desiccant which adsorbs the moisture, from bottom to top.
The regeneration process
2 The blower takes ambient air
3 and blows it over the external heater.
4 The heated air is then sent through the saturated desiccant, forcing the adsorbed moisture out, from top to bottom.
Switching
5 After regeneration, the functions of both towers are switched.
Cooling
Zero purge: After the heating, the hot tower desiccant is cooled. Cooling is done by sending air from the hot vessel over a cooler and back into the hot tower,from bottom to top.
Purge: After the heating, the hot tower desiccant is cooled. Cooling is done by expanding dry compressed air from the outlet of the adsorbing vessel over the hot re-activated tower, from top to bottom.
Protecting your reputation and production
Compressed air entering the air net is always 100% saturated.When it cools, this moisture will condense, causing damage to your air system and finished products. Removing moisture from compressed air with a pressure dewpoint (PDP) as low as -70°C/-100°F, Atlas Copco desiccant dryers eliminate system failures, production downtime and costly repairs.
Highest reliability
• A constant pressure dewpoint down to -70°C/-100°F at 100% load conditions.
• A proven, durable design for the switching valves significantly improves the dryer lifetime.
• An advanced control and monitoring system ensures production efficiency.
Maximum energy efficiency
Atlas Copco’s desiccant dryers incorporate energy-saving features to cut your carbon footprint. A low pressure drop below 0.2 bar/2.9 psi drives down energy costs. Dewpoint sensing and control adapts the energy consumption to the real load of the dryer. An adjustable PDP setpoint enables you to adapt the dryer to your actual needs.
Easy installation and long maintenance intervals
The dryers have a small footprint thanks to an innovative all-in-one design. Delivered ready for use, installation is straightforward, minimizing costly production downtime.
Assuring your peace of mind
All internal components are easily accessible to facilitate maintenance. The use of high-grade desiccant and durable valves extends maintenance intervals beyond the standard three years.
BD 250+ Dual Tower
Excellent performance, efficient performance
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
| Type | Working pressure | FAD | Maximum temperature (ambient/air inlet) | Pressure drop (without filter) | Random filter model | Motor power | Volt | Dimensions | Weight | Outlet |
| Pre | Post | L | W | H |
| bar | I/s | m³/min | °C | bar | 0.01μm
0.01ppm | 1μm | kW | mm | mm | mm | kg | Inch |
| BD300+ -40°C&-70°C | 4.5~14.5 | 300 | 18.0 | 45/50 | 0.20 | UD310+ | DDp 310+ | 10.0 | 400V/3Ph/50Hz | 1434 | 1123 | 2006 | 777 | G2" |
| BD300+ZP -40°C Zero gas consumption | 4.5~15 | 300 | 18.0 | 45/50 | 0.20 | UD310+ | DDp 310+ | 10.0 | 400V/3Ph/50Hz | 1434 | 1088 | 1828 | 736 | G2" |
Desiccant: Molecular sieve
Note: The supply includes pre-filter UD+ and post-filter DDp+
Reference working conditions:
Ambient temperature: 25°C
Intake air temperature: 35°C
Working pressure: 7 bar
Extreme operating conditions:
Maximum ambient temperature: 45°C
Minimum ambient temperature: 2°C
Maximum air intake temperature: 50°C
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