What are the methods of compressed air drying?

Compressed air can be pressurized, cooling, adsorption and other methods to remove the water vapor which can be heated, filtered, mechanical separation and other methods to remove liquid water. One of the refrigeration dryer is to reduce the compressed air to exclude the water vapor contained therein, while the adsorption dryer by adsorption to remove water vapor in the compressed air, so as to obtain a relatively dry compressed air equipment.