Heat Regenerative Desiccant Dryers

Heated Desiccant Air Dryers

If you are looking to purchase an air compressor, you most likely will also need a compressed air dryer. Water is a natural by-product of any compressed air process. When air is compressed, the moisture that is naturally present in the air is also compressed. When air leaves an aftercooler and moisture separator, it is typically saturated and as it cools while moving through distribution piping, it can condense, causing corrosion, contamination and other detrimental effects that result in low productivity, high maintenance costs and excessive downtime.

These dryers operate similarly to heatless dryers, with a big exception. Dried air diverted from the air system is first passed through a high-efficiency external heater before entering the off-line tower to regenerate the desiccant. Since this heated air can hold considerably more moisture than unheated air, only about half the amount of dried compressed air is needed for regeneration. Although the addition of the heater and associated components raises the initial capital investment for a heated dryer, less diverted compressed air means lower operating costs.

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Available in flows ranging from 2.5 nm3 /min. (90 scfm) to 141.6 nm3 /min. (5,000 scfm), Ingersoll Rand HL heatless desiccant dryers are designed to ensure a constant -40°C (-40°F) or optionally -70°C (-100°F) pressure dew point, virtually eliminating costly interruption of production due to moisture. Clean air is further assured by use of strategically placed filters: a pre-filter to remove oil and contaminants in air entering the dryer, and an after-filter to make sure that only clean dried air exits the dryer.