Problem: I am using a refrigerated dryer to dry my compressed air, but I am still finding a lot of moisture in my lines and in other equipment downstream of my compressor. The dryer is functioning fine, but what can I do to get rid of the moisture?
Solution: If you are in need of very dry air, beyond the scope of what a refrigerated dryer can produce, then you need a desiccant dryer. Desiccant dryers use desiccant material to adsorb and remove the humidity in compressed air and can also reach a dew point as low as -100 °F. These dryers help protect your equipment and lines from the presence of any moisture or humidity in the air and help prevent pipe corrosion/leakage, decreased efficiency of tools and freezing water in pipes in areas with very low ambient temperature. If you are working in below freezing temperatures or need very dry air for manufacturing, panting, sand blasting, etc. then a desiccant dryer is an ideal solution.
When choosing a desiccant dryer to replace your refrigerated dryer, there are 3 types: heated, heatless and blower purge. A heatless dryer will use approximately 12-18% of the rated capacity of the dryer to purge back through the "wet" tower for the drying process. A heated desiccant dryer uses lower flows (4-8%) to heat and dry the desiccant material. A blower purge desiccant dryer uses almost no compressed air in the drying process. Here a blower and heat are used to dry the air instead of using your compressed air, which saves big on energy costs.