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CD+ series (330-1400 l/s, 700-2968 cfm)
AD+ series (330-3000 l/s, 700-6360 cfm)
BD+ series (330-3000 l/s, 700-6360 cfm)
XD+ series (550-3600 l/s, 1165-7629 cfm)
COMPLETE PROTECTION FOR YOUR APPLICATION
Dry and clean compressed air is essential for a broad range of industrial applications. Yet it must be produced reliably, energy-efficiently and cost-effectively. Atlas Copco’s desiccant dryers protect your systems and processes. Their robust design ensures they operate with total reliability and deliver a constant, stable dewpoint in full load conditions and even during a temporary overload.
Electronics
■ High-quality dry compressed air is a must to remove microscopic debris from the surfaces of computer chips and boards.
■ Moisture contamination is avoided: no oxidation of micro-terminal strips.
■ A continuous flow of dry compressed air at a dewpoint as low as -70°C/100°F.
■ Moisture contamination is avoided: no oxidation of micro-terminal strips.
■ Moisture contamination is avoided: no oxidation of micro-terminal strips.
Food & Beverage
■ A reliable source of dry compressed air for the preparation and processing of food and beverages.
■ Any kind of moisture is eliminated: the free and easy movement of ingredients, items or food/beverage is guaranteed.
Oil & Gas
■ Particularly for offshore, high-quality dry compressed air is critical.
■ Full protection of your production continuity.
■ A continuous supply of dry compressed air available 24/7 at a low dewpoint.
Pharmaceuticals
■ A consistent flow of high-quality dry compressed air is vital in the processing and manufacturing of most drugs and medicines.
■ Eliminating any moisture is critical to produce pharmaceuticals as some materials have a physical affinity for moisture.
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.
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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. 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.
HOW DOES A DESICCANT DRYER WORK?
Wet air passes directly through the desiccant medium which adsorbs the moisture. The desiccant medium has a finite capacity for adsorbing moisture before it must be dried out, or regenerated. To do this, the tower containing saturated desiccant medium is depressurized and the accumulated water is driven off. How this happens depends on the type of desiccant dryer:
- Heatless dryers use only compressed air as purge
- Heated purge dryers use a combination of compressed air as purge and heat
- Blower dryers use a combination of air from an external blower and heat.
- Heat of compression dryers use the heat of the
The drying process
- Wet compressed air flows upward through the desiccant which adsorbs the moisture, from bottom to top (1).
The regeneration process
Heatless desiccant dryers:
- Dry air from the outlet of the drying tower is expanded to atmospheric pressure and sent through the saturated desiccant, forcing the adsorbed moisture out (2) (4).
- After desorption, the blow-off valve is closed and the vessel is re-pressurized.
- Dry air from the outlet of the drying tower flows over an electric After heating it is expanded to atmospheric pressure and sent through the saturated desiccant, forcing the adsorbed moisture out (2) (4).
- After desorption, the blow-off valve is closed and the vessel is re-pressurized.
Heated purge desiccant dryers:
Heated purge desiccant dryers:
- Dry air from the outlet of the drying tower flows over an electric After heating it is expanded to atmospheric pressure and sent through the saturated desiccant, forcing the adsorbed moisture out (2) (4).
- After desorption, the blow-off valve is closed and the vessel is re-pressurized.
Heated blower desiccant dryers (purge cooling or zero purge cooling):
- The blower (5) takes ambient air and blows it over the external heater (6). The heated air is then sent through the saturated desiccant (2), forcing the adsorbed moisture out, from top to
- 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 reactivated tower, from top to bottom
Purge cooling:
Zero purge cooling:
- 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 reactivated tower, from top to bottom
Switching
- After regeneration, the functions of both towers are switched (3).
Atlas Copco’s XD+ adsorption dryers use the heat of compression from oil-free compressors to dry compressed air. This heat is used effectively to regenerate the high quality desiccant, significantly reducing energy and operating costs. As any need for outside energy supply can be eliminated, adsorption is by far the most economical method of compressed air drying
Heat of compression desiccant dryers (with zero purge cooling)
A wealth of possibilities:
XD+-S models
Both models are available as single inlet and double inlet variant.
Use the heat of compression for regeneration and feature dewpoints of -10°C to -20°C, dependent upon ambient conditions. When combined with the high outlet temperatures of a ZR compressor, XD+-S Purge models can achieve a dewpoint of -40°C
XD+-G models
Combine heat of compression re-activated adsorption and internal heaters to achieve a constant pressure dewpoint of -40°C / -70°C or lower, regardless of ambient conditions.
SUPERIOR ENERGY-EFFICIENCY
A dryer’s energy consumption mainly goes to internal pressure drops and the regeneration process. The key for designing desiccant dryers is therefore to keep the pressure drop as low as possible, and to develop technologies that allow regeneration to be as efficient as possible. Atlas Copco’s dryers are designed to have a very low internal pressure drop, and provide the most efficient regeneration process.
Lifecycle cost
Desiccant dryer selection should be based on the required dewpoints and the cost of energy required to operate the dryer, and not only the initial capital cost. The energy costs are heavily dependent on the way in which the desiccant is regenerated. The illustration compares the lifecycle cost for six types of desiccant dryers sized to dry 550l/s (1160cfm) of compressed air at 7bar. The heatless desiccant dryer is the most expensive to operate because of the high amount of compressed air that is consumed for purging during the regeneration cycle. Typically, 15% of the rated flow capacity of a heatless dryer is consumed as purge air. Although the cost of operating this type of dryer is high, the heatless type is often selected because of its simplicity and reliability.
Efficient regeneration due to Dewpoint Dependent Switching
Atlas Copco’s CD+, AD+, BD+ and XD+ desiccant dryers incorporate state-of-the-art energy management control with built-in Dewpoint Dependent Switching. This makes the dryers more efficient, leading to energy savings of up to 90%, depending on installation and usage. The principle is simple. Although the regeneration time remains constant, the delay before switching from one tower to the other is controlled via the PDP sensor. This is connected to a
hygrometer which precisely measures the remaining humidity in the outlet compressed air. As soon as the target PDP is reached, the dryer cycle that was on hold will resume by switching to the dry tower. Delaying cycles in this way leads to major energy savings. This occurs when operating conditions are lower than reference, or the flow fluctuates below maximum nominal load.
CD 330+-1400+:OUTSTANDING RELIABILITY AND AVAILABILITY
Long-life silica gel desiccant
- High-adsorption silica gel desiccant needs less reactivation energy than other drying agents.
- 2-layer desiccant bed; a water-resistant bottom layer protects the high- performing top
- Pressure dewpoint of -40°C/-40°F as standard (-70°C/-100°F as option).
- Up to 30% extra desiccant overfill to deliver consistent performance even in harsh conditions such as high temperatures and temporary
Stainless steel valves
Fully stainless steel high-performance butterfly valves with actuators ensure long lifetime.
Low-wattage density heater
- Stainless steel design ensures long
- Nickel-plated heater pipe protects against
- Heater is installed in an insulated heater pipe for most energy- efficient
- Optionally insulated vessels are available to further reduce heat losses and increase overall efficiency (standard on the -70°C/-100°F variant).
Galvanized piping with flanged connections
Flanged piping simplifies maintenance and minimizes the chance of leakage. Pipe sizing is optimized to ensure a low pressure drop, resulting in energy savings.
