air dryer
An air dryer is a device used to remove moisture from compressed air. When air is compressed, the pressure causes the air temperature to rise, which increases its ability to hold moisture. As the compressed air cools, however, the moisture in the air can condense and accumulate in the air distribution system, leading to corrosion, rust, and damage to pneumatic tools and equipment.
An air dryer works by removing moisture from the compressed air stream before it enters the air distribution system. The most commonly used types of air dryers are refrigerated dryers, desiccant dryers, and membrane dryers.
Refrigerated dryers work by cooling the compressed air to a temperature where the moisture in the air condenses into water, which is then separated from the air stream. The dried air is then reheated before it enters the air distribution system.
Desiccant dryers use a material, such as silica gel or activated alumina, to adsorb moisture from the compressed air. The adsorbent material is then regenerated using heat or compressed air to remove the moisture and restore the material’s adsorption capacity.
Membrane dryers use a membrane to selectively permeate water vapor from the compressed air stream, leaving behind dry air. These dryers are typically used for small to medium-sized compressed air systems.
The choice of air dryer depends on factors such as the compressed air flow rate, the level of moisture in the air, and the operating conditions. When selecting an air dryer, it is important to consider factors such as the efficiency, reliability, and maintenance requirements of the equipment.