Compressed Air and Gas Dryers-Types and Technology

Compressed Air and Gas have varied applications in different industries. Although, both if not dried can cause severe damages as well as corrosion to pneumatic systems and electromagnetic valves, blistering as well as peeling effect on surfaces painted with spray and increased resistance in flow etc. Hence compressed air and gas need to be dried using dryers.

Four types of compressed air and gas dryers: -

Refrigerated Air Dryers

It reduces the temperature of the air to condensing point forming water vapors. Specially designed refrigerated dryers produce air with dew points of approximately 36°F (2°C). However, applications which are water sensitive should not use these dryers as some water vapors are left in the air, so it does not completely dry out the air or gas.

Chemical dryers

Beds of chemicals, like calcium chloride and lithium chloride, are laid down over which the air is passed, which attracts the water vapor. Saturated chemicals with water vapors are removed. 

Desiccant dryers

Compressed air is passed over a bed of desiccant material that absorbs water vapor. The airflow is switched to the second bed of desiccant material when the bed capacity is nearly saturated. The first bed is then regenerated. Based on the regeneration it is divided into heated desiccant dryers that uses electricity or steam to regenerate and heatless desiccant dryers that uses air generated by the dryer.

Membrane air dryers

Specially formulated membrane microtubes that are selectively permeable to water vapor are used. Water vapor diffuses through the membrane as the compressed air flows along the length of the, producing clean, dry compressed air at the outlet.

Amongst the few high-quality compressed air and gas dryer manufacturers are Multitech sales are the leading firm. They produce products of international quality standards and are a reputed name in the industry.

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