The difference between a dry dryer and a cold dryer

Dry blowers and cold dryers are commonly used drying equipment in post-processing of compressed air. The core difference lies in the drying principle and applicable drying requirements.

Cold dryers (freeze dryers) cool the compressed air and reduce its temperature to below the dew point, so that liquid water in the air condenses into water droplets, which are then discharged through the separation device. This process mainly processes condensed liquid moisture in compressed air and is suitable for scenarios with low requirements for dryness (such as general industrial gas). It can effectively reduce liquid water in the air, but it is difficult to completely remove gaseous water vapor.

Dry dryers (adsorption dryers) use the physical characteristics of adsorbents (such as activated alumina, silica gel, etc.) to directly adsorb water vapor molecules in the air, further reducing the dew point temperature of the air. Its drying effect is more thorough and can reduce the dew point of compressed air to below-40℃ (cold dryers are usually 0-10℃). It is suitable for scenarios with extremely high requirements for dryness (such as medical, electronic, precision instruments, etc.), completely avoiding the potential impact of gaseous water vapor on gas-using equipment or products.

The compressed air output by Granklin water-lubricated single-screw air compressor itself is free of oil pollution. If you need to further improve the air dryness, you can use it with a cold dryer or a dry dryer according to the actual air demand: the cold dryer meets the basic drying needs, and the dry dryer provides a deeper and high-cleanliness drying solution. Combined with the oil-free characteristics of Granklin air compressors, the two can provide users with clean air protection from the entire process from compression to drying.