Description
Applications
A-DRY desiccant adsorption dryer has been designed to separate water vapour from compressed air thus reducing the dew point in the system. Adsorption dryers are commonly used in outdoor settings where freezing is a concern and in applications that demand high air dryness standards (PDP < +3°C), like process air in industries such as food and beverage, pharmaceuticals, electronics, and chemicals. Among the various types, heatless regeneration adsorption dryers are popular due to their simplicity, reliability, and cost-effectiveness.
The Heatless Absorption Compressed Air Dryer
The Compact A-DRY series dryer is comprised of an upper and lower control block, a controller with an LED display, and two desiccant-filled columns that operate alternately. In the first column, adsorption occurs under pressure, while the second column regenerates using a portion of already dried compressed air at ambient pressure.
When the first column reaches a certain saturation level, a switch-over to the second column takes place. This ensures that the adsorption process continues without any pressure drop at the dryer’s outlet. Regenerating the saturated desiccant is made possible by utilising a small portion of already dry compressed air, which is decompressed to an extremely dry state.
This highly dry decompressed air, known as “purge air,” is then directed through the saturated column in reverse flow to remove the adsorbed water molecules from the desiccant and release them back into the ambient environment.
The new innovative design of A-DRY adsorption driers, created with our customers in mind, allows for quick and dependable installation, usage, and maintenance. Our plug-and-play controller simplifies the installation process, while reducing the number of components and steps needed for assembly and disassembly ensures efficient and reliable servicing.
Operating cycles
Fixed Cycle Mode
The transition between columns is controlled by a timer. With the use of high-quality adsorbent and advanced control techniques, the adsorption cycle has been extended to 10 minutes. This leads to fewer switch overs, reduced compressed air consumption, and less wear on essential components.
Adsorption = 5 min
Regeneration = 4 min
Pressure build up = 1 min
Variable Cycle Mode (Switching Based on Dew Point)
By connecting a dew point sensor to the controller, the duration of adsorption can be prolonged according to the sensor’s readings, while regeneration can be completed in just 4 minutes. Opting for the variable cycle mode when operating the dryer can significantly reduce average purge air consumption to exceptionally low levels, possibly even below 3%.
Standby Mode in A-DRY Series Heatless Adsorption Dryers
A feature of A-DRY series adsorption dryers allows them to receive a standby signal from the compressor or another compressed air source. In standby mode, air can freely flow through both towers from the inlet to the outlet of the adsorption dryer. Simultaneously, the adsorption dryer controller is in standby mode and poised to return to normal operation upon receiving the appropriate signal. The standby signal is transmitted to the A-DRY adsorption dryer via a standby contact on the controller using a connected switch.
Easy Maintenance
Thanks to the innovative column design, replacing desiccant can be completed within minutes. The entire column can be easily removed from the dryer by loosening four top nuts and removing side locking screws. This allows for refilling or replacing the column with a new one. Removing the column provides easy access to the check valve and purge nozzle without having to disassemble the entire adsorption dryer. Valves and membranes are situated beneath the lower control block, enabling quick and simple access for replacement.
National Filters do also offer alternative heatless regeneration adsorption dryers that are geared up for larger applications ideal for flow rates between 110 to 1152Nm³/h (Click here)
National Filters is here to assist you in assessing your business goals and selecting the ideal air compressor dryer solution to meet your specific needs and requirements.
For more information get in touch with your National Filters Representative. sales@nationalfilters.com.au
Call 1300 DRY AIR (1300 379 247)
