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CompAir (S.A.) (Pty) Ltd

Downstream Equipment - Air Treatment Methods

Downstream Equipment - Air Treatment Methods

Water vapor is another natural ingredient which can be found in variable amounts in the air. The amount of water vapor and contamination of the air plays a vital role in the compression process and in the quality of the air delivered by the compressor.
 
The damaging and corrosive properties of water are well known. Untreated air at atmospheric pressure contains large amounts of water and other contaminants such as oil droplets and dirt particles.
 
When the air is compressed the concentration of moisture and other contaminants increases. If allowed to remain in the system this corrosive mixture has a detrimental effect on pneumatic equipment, causing unnecessary production downtime, product spoilage and reduced equipment life.
Compressed air filters remove the oil and dirt content while compressed air dryers remove water vapor before air reaches the point of use.
 
WATER SEPARATORS
 
WS Water Separators have been designed for the efficient removal of bulk liquid contamination from compressed air. Filters are used both prior to, and after compression. Filtering the intake air reduces the intake wear on the compressor by removing larger particles. During the compression air can be contaminated with oil (in oil lubricated machines) which is removed by filters. The filter efficiency is dependant on compressor type, age, design and condition. Filters are often setup in multistage. Fibre filters can only trap oil as droplets, while more efficient active carbon can trap oil as a vapour. We can help you select the right filters for your needs.
 
FILTERS
 
During the compression air can be contaminated with oil which is removed by filters. The filter efficiency is dependent on compressor type, age, design and condition. Filters are often setup in multistage. Fibre filters can only trap oil as droplets, while more efficient active carbon can trap oil as a vapour. We can help you select the right filters for your needs.
 
To meet varying requirements, CompAir filters are available in five filter variants:
TYPE B: High Efficiency General Purpose Protection
Particle removal down to 1 micron, including water and oil aerosols. Maximum remaining oil aerosol content: 0.6 mg / m 3 at 21 °C / 0.5 ppm(w) at 70 °F.
TYPE C: High Efficiency Oil Removal Filtration 
Particle removal down to 0.01 micron, including water and oil aerosols. Maximum remaining oil aerosol content: 0.01 mg / m 3 at 21 °C / 0.01 ppm(w) at 70 °F.
TYPE D: Oil Vapour & Odour Removal
Maximum remaining oil vapour content: 0.003 mg / m 3 at 21 °C / 0.003 ppm(w) at 70 °F.
TYPE E: General Purpose Dust Filtration
Dry particle removal down to 1 micron.
TYPE F: High Efficiency Dust Filtration
Dry particle removal down to 0.01 micron.
 
REFRIGERANT DRYING
 
Refrigerant drying cools the compressed air, whereby a large amount of the water condenses and can be separated. The compressed air is then heated so that condensation does not form on the outside of the pipe work system.
 
The compressed air cooling takes place, via a closed coolant system, where a refrigerant cooling agent is employed. CompAir uses environmentally friendly gasses for this. By cooling the compressed incoming air with the cooled outgoing air in the heat exchanger, the energy of the refrigerant dryer is reduced.
 
DESICCANT DRYING
 
Desiccant drying works on the principle of absorption of water vapour through a bed of desiccant material, in a pair of chambers. Two types are used, heatless regenerative and heat regenerative. The heatless type uses a percentage of the dried air (purge), for re-generation of the desiccant material, while the heat regenerative type uses an electric heat disk, which reduces the amount of purge air needed for regeneration.

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