Compressor Air Dryer Type and Function

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Air Dryer or air dryer is mainly used to remove moisture from compressed air. Removing moisture is essential to avoid common problems such as corrosion, product deterioration and malfunction. The dryer is usually integrated into the compressor to ensure the correct level of air purity for the application. The unique difference in the type of air dryer is based on the agent used in the machine to dry the incoming air.

1. Refrigerated Dryers

Refrigerated air dryers are the most common type of compressed air dryers and can cool with water or air. This air dryer uses a cooling circuit and heat exchanger to cool compressed air, cool it to a level that condenses moisture to remove, and then reheats the air to prevent wet pipes downstream. Refrigerated air dryers can have a pressure dew point (pressure dew point or PDP) as low as + 37.4 ° F / + 3 °

2. Desiccant Dryers

Desiccant air dryers work by relying on 2 tubes working simultaneously but with different functions. When one tube dries the compressed air, the other tube regenerates. Desiccant air dryers can achieve dew points as low as -40 ° F / -40 ° C and -100 ° F / -70 ° C. Use of a porous dryer absorbs moisture by collecting it in many pores, allowing large amounts of water to be retained by the relatively small number of dryers. The types of dessicants used include silica gel, activated alumina, and molecular sieves.

3. Membrane Dryers

Membrane air dryers consist of cylinders that hold thousands of hollow polymer fibers with an inner layer. When the filtered wet compressed air enters the cylinder, the membrane lining allows moisture to penetrate the membrane walls and collect between the fibers, while the dry air continues through the fibers in the cylinder with a pressure nearly the same as the incoming wet air.

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