Adsorption dryers for compressed air from a compressor
An adsorption dryer dries compressed air using a hygroscopic material that binds moisture to itself. A typical adsorption dryer has two parallel vessels (towers) filled with a porous desiccant, most often activated aluminium oxide (alumina) or silica gel. Moist air flows through the desiccant bed in the first tower, which adsorbs the water vapour from it – at the outlet we thus obtain exceptionally dry air with a pressure dew point commonly around –40 °C (depending on the desiccant, down to –70 °C). Meanwhile the second tower goes through regeneration: the saturated desiccant releases the moisture it captured earlier. Regeneration takes place either by routing part of the dried air back through the desiccant at reduced pressure (with no additional heating), or by heating the tower with a heating element while the moisture is carried away by a small air flow. At regular intervals the two towers swap roles, so the dryer provides a permanently continuous stream of very dry air.
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Advantages
- The ability to reach very low pressure dew points (commonly –25 °C to –40 °C, and around –70 °C with high-performance types), which allows use even in freezing environments or for moisture-sensitive processes.
- High moisture removal efficiency – after passing through the adsorber the air is practically free of water vapour (extremely low relative humidity).
- A wide range of designs and capacities: from smaller units to large industrial dryers for central compressed air systems.
- Modern models with external heating or intelligent regeneration control can cut energy consumption and compressed air loss to a minimum.
Disadvantages
- Higher purchase cost and a more complex design than refrigeration dryers (they contain more parts, valves and control elements for switching the towers).
- Operation can be energy-intensive: standard heatless adsorption dryers consume roughly 15–20 % of the dry air produced to regenerate the desiccant. That reduces the total air supply usable at the point of consumption.
- Regular maintenance and replacement of the desiccant: the drying material becomes exhausted or contaminated over time and has to be replaced periodically (typically after several thousand operating hours, depending on load and inlet air quality).
- The need for very good pre-filtration: filters that remove oil aerosols and contaminants must be fitted upstream of an adsorption dryer. Oil or dust would significantly reduce the efficiency of the desiccant and could ruin it.
Areas of use
Adsorption dryers are used in sectors and applications that call for top-quality dry air without the slightest trace of moisture. These include, for example, the pharmaceutical and food industries (packaging, food filling, beverage production), healthcare, the manufacture of electronic components and precision mechanics, the chemical and petrochemical industries, and paint shops with the highest demands on air cleanliness. They are also irreplaceable wherever air lines run outdoors or in freezing conditions – dry air with a dew point of –40 °C reliably prevents condensate and ice forming in the pipework. Examples include the operation of pneumatic equipment on oil rigs, in rail transport (brake control) or in automated cold stores.
Comparison with other dryer types
Compared with refrigeration dryers, adsorption dryers deliver incomparably drier air, but at the price of higher investment and running costs. For ordinary workshop use a refrigeration dryer is therefore often the preferred choice, provided a dew point of around +3 °C is sufficient. Adsorption technology comes into its own where other methods are not enough – membrane dryers, for example, would not be economical at larger air volumes and would not reach such a low dew point. Conversely, for very small air consumption an alternative to a smaller adsorption unit is precisely a membrane dryer, which has lower flow capacities but simpler operation. Adsorption dryers are often supplemented with a further filtration stage – an activated carbon tower, for example, to remove oil vapours and odours. This achieves completely clean and dry air even for the most demanding applications.
Do not forget: For an adsorption dryer to work properly and last a long time, it is essential to fit effective compressed air filters upstream of it (a mechanical pre-filter and a coalescing filter). These filters capture oil, water aerosol and dust before the air enters the drying tower. That prevents damage to the desiccant and a drop in dryer performance. If you are not sure what level of drying you need, take a look at our advice centre – we will be glad to help you choose a suitable dryer and filtration solution.
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RDP condensation dryers; pressure dew point +3 °C
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Condensation dryers WDF; dew point +3°C with filters
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HDI air dryers; pressure dew point +4°C
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RDL condensing dryers; pressure dew point +5°C
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ADRY air dryers; smaller adsorption -40°C
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BDRY air dryers; large adsorption -40°C
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MADRY air dryers; membrane -40°C
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Activated carbon columns; activated carbon separation
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Product sorting
List of products
The ADRY-150 Series Adsorption Dryer was designed for continuous separation of water vapor from compressed air at flow rates up to 2,500 l/min. Reduces the pressure dew point...
The ADRY-105 Series Adsorption Dryer was designed for continuous separation of water vapor from compressed air at flow rates up to 1,750 l/min. Reduces the pressure dew point...
The ADRY-12 series adsorption dryer has been designed for continuous separation of water vapour from compressed air at flow rates up to 200 l/min. Reduces the pressure dew point...
Service KIT after 4 years of operation of the adsorption dryer Omega Air series ADRY-36 includes replacement filter cartridges, silencers, check valve, gaskets, valve kit,...
Measuring chamber for dew point sensor - for regeneration air saving - BDRY-MK. B-DRY dryers can operate in two operating modes depending on the settings of the control unit....
Dew point sensor including cable - for air saving regeneration - BDRY-OS. B-DRY dryers can operate in two operating modes depending on the settings of the control unit. Fixed...
Measuring chamber for dew point sensor - for regeneration air saving - ADRY-MK. A-DRY dryers can operate in two operating modes depending on the settings of the control unit....
After one year of operation, the ADRY-105 series Omega Air adsorption dryer service KIT includes a replacement microfilter cartridge, dust filter and replacement silencers for...
After one year of operation, the service KIT for the Omega Air ADRY-60 to ADRY-75 series adsorption dryer includes a replacement microfilter cartridge, dust filter and...
After one year of operation, the service KIT for the Omega Air adsorption dryer series ADRY-150 to ADRY-200 includes a replacement microfilter cartridge, dust filter and...
Service KIT 2 years of operation adsorption dryer Omega Air series ADRY-6 includes a replacement filter cartridge ;microfilter, dust filter and replacement silencer, check...
Service KIT 2 years of operation of the adsorption dryer Omega Air series ADRY-150 includes a replacement filter cartridge ;microfilter, dust filter and replacement silencer,...
Service KIT 2 years of operation of the adsorption dryer Omega Air series ADRY-200 includes a replacement filter cartridge ;microfilter, dust filter and replacement silencer,...
Service KIT 2 years of operation of the adsorption dryer Omega Air series ADRY-75 includes a replacement filter cartridge ;microfilter, dust filter and replacement silencer,...
Dew point sensor including cable - for air saving regeneration - ADRY-OS. A-DRY dryers can operate in two operating modes depending on the settings of the control unit. Fixed...
Service KIT 2 years of operation adsorption dryer Omega Air series ADRY-36 includes a replacement filter cartridge ;microfilter, dust filter and replacement silencer, check...
Service KIT 2 years of operation adsorption dryer Omega Air series ADRY-12 includes a replacement filter cartridge ;microfilter, dust filter and replacement silencer, check...
Service KIT after 4 years of operation Omega Air adsorption dryer ADRY-60 series includes replacement filter cartridges, silencers, check valve, gaskets, valve kit, adsorbent...
Adsorption dryer BDRY-600 designed for continuous separation of water vapour from compressed air with a flow rate of up to 7,708 l/min at a maximum pressure of 16 bar and...
The FDRY-1200 Adsorption Dryer is designed for continuous separation of water vapour from compressed air with a flow rate of up to 15,600 l/min at a maximum pressure of 16 bar...
Adsorption dryer BDRY-150 designed for permanent separation of water vapour from compressed air with a flow rate of up to 1 958 l/min at a maximum pressure of 16 bar and...
The BDRY-200 adsorption dryer is designed for continuous separation of water vapour from compressed air with a flow rate of up to 2,617 l/min at a maximum pressure of 16 bar and...
The BDRY-250 Adsorption Dryer is designed for continuous separation of water vapour from compressed air with a flow rate of up to 3,400 l/min at a maximum pressure of 16 bar and...
Adsorption dryer BDRY-400 designed for permanent separation of water vapour from compressed air with a flow rate of up to 5 358 l/min at a maximum pressure of 16 bar and...
Adsorption dryer BDRY-110 designed for permanent separation of water vapour from compressed air with a flow rate of up to 1 433 l/min at a maximum pressure of 16 bar and...
The BDRY-1000 Adsorption Dryer is designed for continuous separation of water vapour from compressed air with a flow rate of up to 13,067 l/min at a maximum pressure of 16 bar...
The FDRY-5000 Adsorption Dryer is designed for continuous separation of water vapour from compressed air with a flow rate of up to 65,000 l/min at a maximum pressure of 16 bar...
Service KIT 2 years of operation of the adsorption dryer Omega Air series ADRY-105 includes a replacement filter cartridge ;microfilter, dust filter and replacement silencer,...
The FDRY-2000 Adsorption Dryer is designed for continuous separation of water vapour from compressed air with a flow rate of up to 26,000 l/min at a maximum pressure of 16 bar...
The ADRY-60 series adsorption dryer was designed for continuous separation of water vapour from compressed air at flow rates up to 1,000 l/min. Reduces the pressure dew point...
Adsorption dryer BDRY-300 designed for permanent separation of water vapour from compressed air with a flow rate of up to 4,183 l/min at a maximum pressure of 16 bar and...
Service KIT 2 years of operation of the adsorption dryer Omega Air series ADRY-24 includes a replacement filter cartridge ;microfilter, dust filter and replacement silencer,...
A-DRY adsorption dryers are equipped with the new generation ADC 4.0 electronic control unit. This version of the controller is easy to use and offers many innovative features....
Service KIT after 4 years of operation Omega Air adsorption dryer ADRY-105 series includes replacement filter cartridges, silencers, check valve, gaskets, valve kit, adsorbent...
Service KIT after 4 years of operation of the adsorption dryer Omega Air series ADRY-75 includes replacement filter cartridges, silencers, check valve, gaskets, valve kit,...
The ADRY-6 series adsorption dryer has been designed for continuous separation of water vapour from compressed air at flow rates up to 100 l/min. Reduces the pressure dew point...
Service KIT after 4 years of operation of the Omega Air adsorption dryer FDRY-3000 series includes a replacement microfilter cartridge, dust filter and replacement silencer,...
The ADRY-200 Series Adsorption Dryer was designed for continuous separation of water vapor from compressed air at flow rates up to 3,333 l/min. Reduces the pressure dew point...
The ADRY-24 series adsorption dryer was designed for continuous separation of water vapour from compressed air at flow rates up to 400 l/min. Reduces the pressure dew point down...
The ADRY-36 series adsorption dryer has been designed for continuous separation of water vapour from compressed air at flow rates up to 600 l/min. Reduces the pressure dew point...