A compressed air dryer is used for removing water vapor from compressed air. Compressed air dryers are commonly found in a wide range of industrial and commercial facilities.
The process of air compression concentrates atmospheric contaminants, including water vapor. This raises the dew point of the compressed air relative to free atmospheric air and leads to condensation within pipes and the compressed air cools downstream of the compressor.
Excessive water in compressed air, in either the liquid or vapor phase, can cause a variety of operational problems for users of compressed air. These include freezing of outdoor air lines, corrosion in piping and equipment, malfunctioning of pneumatic process control instruments, fouling of processes and products, and more.
Water vapor is removed from compressed air to prevent condensation from occurring and to prevent moisture from interfering in sensitive industrial processes.
There are various types of compressed air dryers. Their performance characteristics are typically defined by the dew point.
When requirement of atmospheric Dew Point in compressed air is around -20 to 23 deg. Celsius then best choice of dryer is Refrigerated Air Dryer. This system has lowest running cost because there is no air losses. The system is based on a simple concept of refrigeration cycle and cooling down the air to approximately 3-5 deg. C pressure dew point and separating condensate formed. The system is most efficient and economical to use for most of the applications and is widely accepted in all manufacturing industries.
The coil in coil design combined with well controlled air flow from blower and condenser makes our dryers highly efficient and low on maintenance cost. Imported instrumentation and best available control devices further give trouble free continuous running of our dryers for long time without breakdown, hence saving costs and production losses due to extended life of equipment’s and machinery.
Advance Global Industries is supplying Refrigerated dryers with capacities from 10 cfm to 5000 cfm at 5 bar to 16 bar working pressure in standard range. High pressure dryers up to 40 bar working pressure can also be supplied.
The term "desiccant dryer" or heatless Air Dryer refers to a broad class of dryers. Other terms commonly used are regenerative dryer and twin tower dryer, and to a lesser extent adsorption dryer.
The compressed air is passed through a pressure vessel with two "towers" filled with a media such as activated alumina, silica gel, molecular sieve or other desiccant material. This desiccant material attracts the water from the compressed air via adsorption. As the water clings to the desiccant, the desiccant "bed" becomes saturated. The dryer is timed to switch towers, once this cycle completes some compressed air from the system is used to "purge" the saturated desiccant bed by simply blowing the water that has adhered to the desiccant off.
The duty of the desiccant is to bring the pressure dew point of the compressed air to a level in which the water will no longer condense, or to remove as much water from the compressed air as possible.
A standard dew point that is expected by a regenerative dryer is −40 °C (−40 °F); this means that when the air leaves the dryer there is as much water in the air as if the air had been "cooled" to −40 °C (−40 °F). Required dew point is dependent on application and −70 °C is required in some applications. Many newer dryers come equipped with a dew dependent switching (DDS) which allows for the dryer to detect dew point and shorten or lengthen the drying cycle to fulfill the required dew point. Oftentimes this will save significant amounts of energy which is one of the largest factors when determining the proper compressed air system.
Advance Global Industries provides spares ( Candle Filter, Valves, Silica Gel, Activated Alumina & Carbon ) and servicing for all other makes and types of dryers also.