Desiccant dryers for compressed air

Desiccant dryers for dry air, very low dew point

Heatless Regeneration Desiccant Dryers

Desiccant Dryers are used wherever compressed air or gas needs to be dried to a pressure dew point of -20°,-40° C or, optionally, -70° C. In addition to the specific application, the size of the Desiccant Dryer is primarily determined by the medium, flow rate, operating pressure, inlet temperature and the required pressure dew point.

• Dew point               up to -70°C
• Flowrate                 up to 9,00m3/h
• Connections 3/8” to DN150
• Maximum pressure  16bar

All Hankison desiccant dryers use activated alumina as a desiccant, which adsorbs water without changing its form or properties. Molecules with higher polarity are particularly strongly adsorbed and since water has a very high polarity, activated alumina is excellently suited for use as a desiccant. Owing to its very good chemical stability, activated alumina is also resistant to liquid water. The flow of compressed air enters the Desiccant Dryer from below. The adsorber removes the moisture contained in the compressed air, which then exits via the top of the tower. Desiccant Dryers usually comprise two desiccant towers, one of which adsorbs moisture while the other regenerates.

Clear benefits:

• Low investment and maintenance costs
• Easy installation and operation
• Compact and space-saving
• Constant pressure dew point
• Guaranteed reliability

Key features of the heatless dryers

• Space-saving, integrated pre-filter and dust fi lter are included in the delivery
• Compact design
• Extended contact between compressed air and desiccant for a guaranteed pressure dew point
• Particularly easy to service: desiccant can be active for an extremely long period (up to 5 years)
• Moisture indicator changes colour to signal an increase in the pressure dew point at the dryer outlet
• HHL Series comes with Level 1 controller as standard
• Optional Level 2 controller for energy savings
• Easy operation
• Pressure indicator for tower pressure
• Front-mounted operator panel
• Fully assembled with the necessary pipes and electrical wiring – ready for use

Also available:

Heat Regeneration Desiccant Dryers

Over 65 years of experience in the field of drying and filtration of compressed air have resulted in a most complete range of heat- regenerated desiccant dryers. The utilisation of compressed air for the regeneration of the saturated desiccant is a very expensive solution. Filtered and dried compressed air is a very expensive source of energy, which should possibly not be used for regeneration. Regeneration takes place easier and faster if the desiccant is warmed up. The regeneration air, warmed up to 180°C, desorbs the humidity out of the desiccant and transports it out of the dryer. The energy required is then less than half compared to the heatless regeneration.

The principle of heat regeneration can be divided in three groups:

• Internally-heated desiccant dryers, where heating elements are placed in the desiccant to warm it up.
• Externally-heated desiccant dryers, where air from the environment is aspirated and electrically warmed-up and blown through the saturated desiccant.
• Heat-of-compression systems, where the high temperature at the outlet of the compressor is used for regeneration.