A picture of a number of air compressor units

A Quick Guide to Air Dryers


Air dryers – a quick guide

If you run air compressors at your place of work, you may benefit from installing an air dryer. Although there will be an initial outlay, a dryer should improve the overall efficiency of your compressed air system.

Reasons for installing an air dryer

If you’ve experienced premature failure of your air tools or cylinders, or noticed condensate building up in your equipment or airline, then an air dryer could be the solution.
Applications such as shot blasting and car spraying using an air compressor can also benefit from the addition of an air dryer.

What do air dryers do?

Air compressors are designed to give a fresh, clean supply of air. Over time, however, condensate can build up; this can cause damage to equipment, reducing machine performance, and impacting energy efficiency.
The result? Additional costs and headaches for your business.
Working in tandem with line filters, air dryers help to remove water droplets from a compressed air system, preventing the build-up of condensate in airlines and other equipment.
What are the various types of compressed air dryers, and how do they work?

Desiccant dryer

These are also known as regenerative dryers, twin tower dryers, or adsorption dryers. Two internal towers containing desiccant are alternately used to filter air as it passes through, drawing out the water. The saturated desiccant is then dried by compressed air and the cycle can begin again.

Refrigerant dryer

Efficient and effective, refrigerant dryers have two heat exchangers, which work together to prevent the formation of condensate. One is an air-to-air heat exchanger, the other is air-to refrigeration. The hot air entering the dryer is cooled down by cool air leaving the dryer and, as the cool air becomes warmer, it can also prevent condensation on the exterior of the pipework.

Membrane dryer

These dryers contain a bundle of membranes with hollow fibres, which remove water vapour from the air passing through. Gas laden with moisture can then be vented outside the machine. These machines require the use of line filters.

Deliquescent dryer

Less used nowadays, the deliquescent dryer comprises a pressure vessel filled with a hygroscopic media, usually a tablet or briquette. This absorbs water vapour then dissolves, forming a solution which gathers at the bottom of the pressure vessel. Once this has happened, the solution is drained and new tablets or briquettes are put in place.
To find out more about the best dryer for your needs and arrange a site visit, call 0114 244 0764 or email sales@simmengineeringgroup.co.uk.