First, high-temperature,high-humidity compressed air comes out from compressor make heat exchanging with dried low-temperature compressed air in the heat exchanger, to reduce its temperature,then enters into evaporation,temperature been further reduced,there,a  majority of steam condensate to water and be drained.Then the low-humidity compressed air enters into the adsorbing barrel, beening further dried and get more lower dew point finished air.At last low-temperature dried compressed air enters into the heat exchange to cooling high-temperature,high-humidity inlet air,meanwhile get higher temperature itself,preventing the out part of pipeline form dewing, a small part of high temperature air be used for refrigeration,enhance regenerating efficiency and reduce energy consume.