+371 263 93 008 office.riga@geheit.de

Compressed air dryers

The air supplied to the compressor inlet under standard conditions (pressure 0 bar g and temperature 20°C) can contain a maximum of 17 g/m3 of water vapour. Subsequent processes of compression and cooling lead to such an undesirable phenomenon as condensation of moisture from the air, which occurs during the passage of air through the process equipment chain. As a result, the following negative consequences can be observed:

  • corrosion of the equipment;
  • freezing of liquid in pneumatic systems, which can lead to clogging of pipes and damage to equipment;
  • lubrication failure of pneumatic cylinders, etc.

Thus, the removal of humidity during air preparation is one of the most important and priority tasks.

Geheit GmbH offers their customers equipment designed to dry the air after compression, which works on the basis of principles:

1) Condensation by cooling.

2) Adsorption.

In the first case, in order to extract moisture from the air, it is cooled down to the dew point in the refrigeration dryer. Here, the compressed air is pre-cooled in the air heat exchanger, and then it enters the heat exchanger, where it is additionally cooled with liquid cooling agent until it reaches the dew point. Moisture condenses, accumulates and is automatically removed from the process. The design involves heating the air coming out of the dehumidifier with an incoming air stream. This prevents the formation of condensation in the air system after the dehumidifier and saves energy.

In the second case, moisture is removed by means of adsorption: an adsorbent with a high specific surface area absorbs liquid particles from the air. Adsorbents used are as general: porous carbon, silica gels, zeolites, other natural and synthetic materials. Since the adsorbent cannot adsorb moisture infinitely, its regeneration is required periodically: cold or hot. In the case of cold regeneration up to 25% of the compressed air can be used for adsorbent regeneration, which means that there are significant compressed air losses when there is low energy consumption and low equipment costs. However, the cold regeneration method is appropriate under low and medium flows.

With hot regeneration it is possible to reuse the entire adsorbent resource, but this process requires the use of external energy sources. Hot regeneration can be used at high flow rates.

Geheit GmbH provides delivery, installation and piping of refrigerator and adsorption dehumidifiers of cold and hot regeneration from German companies ALMiG Kompressoren GmbH and FST GmbH.

The ADD refrigeration dryer from ALMiG Kompressoren GmbH

The refrigeration dryers of the ADD series can be used flexibly in numerous applications:

  • as a stand-alone unit;
  • as part of a set (compressor plus refrigeration dryer);
  • for wall mounting.

These refrigeration dryers cut your production costs and improve productivity. A powerful, two-stage, stainless steel plate heat exchange system guarantees reliable dryer operation up to an inlet temperature of +55°C and a pressure dew point of +3°C.

Technical Data:

Flow rate: 23 – 310 m3/h.

Cooling air required: 300 – 2300 m3/h.

Compressed air connection: 1/2‘‘ -1 1/2‘‘.

Power consumption: 0,18 – 1,04 kW.

Size: from 692 x232 x 610 mm to 790 x330 х 797 mm.

Energy-saving refrigeration dryer ALM-E from ALMiG Kompressoren GmbH

The powerful refrigeration dryers of the ALM series are highly efficient quality dryers which have proven themselves in countless applications. They offer good profitability and reliability at inlet temperatures of up to +60°C and a pressure dew point of +3°C.

The series is also characterised by particularly large heat exchanger surfaces, guaranteeing a constant pressure dew point and good water separation even under extreme operating conditions.

The integrated speed control adapts the energy requirement of the ALM-E series to the compressed air volume in the refrigeration dryer. This delivers a potential energy saving of up to 50% with a stable pressure dew point.

Technical Data:

Flow rate: 20 – 5100 m3/h.

Cooling air required: 1020 – 16200 m3/h.

Compressed air connection: 3/8‘‘ –DN 150.

Power consumption: 0,24 – 13,4 kW.

Size: from 320 x383 x 390 mm to 1584 x1400 x 2112 mm.

More information can be found at  https://almig.com/.

Adsorption dryer DPS from FST GmbH

Series DPS adsorption dryers can dry the compressed air to a pressure dew-point of up to -70°C. In doing so, they create dry, thoroughly undersaturated compressed air in which no further condensation takes place and thus no formation of liquid water can occur at compressed air temperatures above the pressure dew-point.

Technical Data:

Achievable pressure dew-points: [-25°C] – [-70°C].

Maximal volume flow: 8 – 6.290 m³/h.

Maximal operating pressure: 11 – 16 bar.

Power supply: 230 V AC.

Connection: G ⅜ – G 2 | DN 50 – DN 125.

More information can be found at https://www.fstweb.de

All details are subject to change and clarification, details must be clarified!


GEHEIT representative in the Baltic States:

Akaciju street 3B, Riga, LV-1029
Tel.: +371 263 93 008
Tel.: +371 221 15 996
E-mail: office.riga@geheit.de