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Energy savings accessories

Atlas Copco HOC adsorption dryer

When air is compressed and cooled, the water vapour which is aspirated by the compressor along with atmospheric air, gets condensed. While most of the free water is removed by water separators, the air which flows into the pipelines is still saturated with water vapour. If this is not removed, several problems would result. Examples are poor quality of the end products, corrosion and rusting in pipelines, damage of sensitive components, etc. Some processes have specific requirements as to the degree of dryness and this is specified by Pressure Dew Point, or PDP. While drying of compressed air is necessary, this normally consumes energy between 5 and 20% of the equivalent compressor motor power.
Heat of compression dryers (HOC), on the other hand, use heat which is generated in the process of compression, to dry the compressed air. Hence energy consumption in HOC dryers is much lower than the other types. To make a comparison, the following table may be referred.

Open table
Inlet air flow = 18000m3/h FADUnitXD4000 G-70 (HOC type)Blower reactivated typeHeated purge type
Discharge pressure dew point-70-70-70
Half cycle timemin837300300
Average purge flow%0.9%1.9%5.3%
Average power consumptionWatt136003750046300
Annual electrical energy consumptionkWh119000328000405000
Annual total energy consumption (purge 0.15 kWh/m3)kWh3110007280001540000
Annual CO2 production from production of electricitykg134000313000661000
Annual total power cost (0.07 euro/kWh)Euro2170051000108000
Total power consumption compared%43%100%212%
The table compares energy consumption of 18000 m3/h HOC dryer with other type of dryers, achieving the same PDP of -70℃. The achieved savings of about 500,000 kWh per year means a cost saving of almost 335,000 RMB per year, on drying alone. Other than that, there is a reduction of 527 tons of CO2 in one year, which benefits the environment.

There are different types of HOC dryers:

MD rotation HOC adsorption dryer

MD 2500 VSD adsorption dryer front right
This is the most energy efficient HOC dryer. The active component of a rotary HOC dryer is a desiccant, which is embedded in a drum. The compressed air is dried in a portion of the drum, while the rest of the drum is being regenerated by hot compressed air coming from the compressor. This type of dryer does not consume any energy for the drying process. Only a very small amount of energy is consumed for rotating the drum. Another unique feature of this design is that the pressure drop through the dryer is very small. This brings further energy savings. There is also normally no need to provide filters before and after this dryer type, thereby further reducing pressure drops and eliminating the costs associated with changing the filters regularly.
Capacity range: 50L/S-2500L/S
Suggested with: Oil-free compressor (Z series screw or centrifugal compressor)
Pressure dew point: 0 to -40 ℃ (according to different working conditions)
Application industries: All industries
  • Unique patented design and energy saving technology
  • No loss of air very low power consumption (~ 0.12KW)
  • No additional connecting pipes,  valves and filters to save the cost of investment
  • Easy to install and can be integrated in the compressor
  • Stable operation and reliable pressure dew point
  • Environmentally friendly materials and 95% recyclable

XD twin towers HOC adsorption dryer

XD 4500 ZP front view
All the hot air from the compressor first comes into the first tower for regeneration, and is then cooled to remove water and then dried in the second tower. This type of HOC dryer is recommended when hot air from the compressor is at a lower temperature or the PDP requirements are even lower than what the rotary drum design can achieve.
Processing capacity: 1400L/S-7000L/S
Suitable situation: Oil-free compressor (Z series screw or ZH centrifugal compressor)
Pressure dew point: 0 to -70 ℃ (according to different working conditions)
Application Industries: Typically, electronics, chemicals, textiles, steel, etc.
  • The world's first -70 ℃ PDP, HOC type dryer
  • Energy savings
  • Low drop pressure
  • Stable  pressure dew point
In summary, Atlas Copco's MD rotary drum and XD twin tower heat of compression dryers provide the most energy efficient drying solutions, which bring economy to their users and huge environmental benefits.

AIRnet - Compressed Air Piping System

AIRnet is a compressed air piping system that delivers quality air exactly where you need it, from compressor to point of use.

With AIRnet you can ensure minimal pressure loss at the lowest operating cost for your compressed air installation. AIRnet differentiates itself through innovation, flexibility and ease of installation, meeting all of your design and production requirements more cost effectively than traditional systems.

Please click to learn more about AIRnet.