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What is Adsorption dryer


How They Work:


In an adsorption dryer, also referred to as a desiccant dryer, most air flows over a bed of hygroscopic material—such as silica gel, molecular sieves,   or activated alumina—which absorbs the water vapor from the air.     


As this process continues, the hygroscopic, or desiccant, material becomes increasingly saturated with the extracted moisture.

Some desiccant dryers are of a single vessel, non-regenerative design where you must replace the desiccant on a frequent basis. For purpose of this article, will address industrial type regenerative adsorption drying systems.


As such, adsorption dryers typically incorporate two drying vessels, one of which dries the incoming compressed air while the other is undergoing regeneration in order to regain its ability to dry the air after it has reached maximum saturation capacity. The dryer may facilitate desiccant regeneration with the help of timers or dew point monitoring devices.


Using an adsorption dryer requires that appropriate water separation and drainage protocols are in place prior to the compressed air entering the dryer. If using a traditional oil-lubricated compressor, it is critical to ensure a clean, functional high-efficiency oil separating filter (0.01 micron) with a reliable automatic drainage device is installed upstream of the dryer. In addition, a particle filter (1.0 micron) is recommended for use after the air dryer to prevent the fine abrasive particulate dust from migrating downstream of the dryer.