The four main types of compressed air dryers are refrigerated, chemical, desiccant, and membrane. It is important to understand how each drying technology works to determine which is best for your needs. As the premiere compressed air dryers products supplier in GA, we’re sharing tips to help you choose the correct product for your application.
Compressed Air Dryers Products in GA
Refrigerated dryers work by cooling the air to low temperatures and condensing much of the water vapor. It is not possible to achieve dew points below freezing with a refrigerated dryer. Optimally designed refrigerated dryers can produce air with dew points to approximately 36°F. Since some water vapor is left in the air, these dryers should not be used in water-sensitive applications.
Chemical dryers use a process of passing the compressed air over beds of chemicals, typically calcium chloride and lithium chloride, which attract the water vapor. The chemicals become saturated with water vapor and are discarded. The lowest dew point achievable with this type of dryer is 27°F.
Installation of a high efficiency filter upstream from the chemical dryer is essential because the life of the chemicals is significantly reduced if liquid water enters the dryer. A particle removal filter is needed downstream to prevent carryover of the chemical particles.
Desiccant dryers pass the compressed air over a bed of desiccant material, which absorbs water vapor molecules. When the bed capacity is nearly saturated, the airflow is switched to a second bed of desiccant material and the first bed is regenerated.
Timers or dew point monitoring equipment can be used to control the regeneration phase. Desiccant dryers can deliver air at consistently low dew points, typically 40°F or less. This technology is a good choice when the compressed air is subject to freezing conditions.
Membrane air dryers use specially formulated membrane micro-tubes that are selectively permeable to water vapor and provide an excellent medium for producing dry air from standard compressed air. As the compressed air travels along the length of the membrane, water vapor diffuses through the membrane, producing clean, dry compressed air at the outlet.
A small fraction of the dry air is then directed along the outside surface of the membrane to sweep the moisture-laden air away from the membrane. These dryers can reduce the dew point of compressed air to as low as -40°F. Membrane dryers are designed with no moving parts and no requirement for electrical supply.
Tips On Specifying The Right Compressed Air Dryers Products In GA
To specify the right dryer for a compressed air installation, keep the following information in mind:
1.Do not over specify. Drying the entire compressed air supply in a factory to dew points less than -40°F (-40°C) is wasteful. It is more sensible to subdivide the compressed air supply by application, treating each point of use as needed to provide appropriately dry air for the downstream application served.
2.Do not underspecify. Damage caused by wet air results in costly maintenance, downtime, and lost product. It’s best to design a drying system to meet specific needs.
3.A drying system that only contains an after-cooler and a coalescing filter could create problems with condensation downstream from the after-cooler. The air is still saturated with vapor, which is likely to condense when the ambient temperature is lower than the compressed air temperature.
4.Take advantage of the “drying” effect of pressure reduction. For applications that use air at lower pressures than the main compressed air line and that tolerate some water vapor, install filters or filter regulators at the point of use to maximize the drying effect of pressure reduction.
5.Specify membrane dryers for those parts of the system that require dew points of 35°F to 52°F and flow rates up to 600 scfm. Membrane dryers can also be used for applications requiring instrument quality air, air exposed to freezing temperatures, and water-sensitive applications requiring flow rates up to 100 scfm. Typically, compressed air with a dew point of -40°F (-40°C) is reasonable for these applications that are sensitive to water vapor.
6.For applications requiring flow rates over 100 scfm and dew points lower than -40°F/°C, a desiccant dryer should be used.
Need help choosing the right compressed air dryers products in GA for your needs? We’re here to help! Contact our office today and we’ll be happy to help you choose the best option for your application.