Attached compressed air dryer is the use of desiccation material itself unique micropores, according to the capillary adsorption of water molecules in the air, and according to the pressure release desorption and adsorption of residual heat to remove the adsorption of water.The equipment is generally made into a double-cylinder form, under the control of the program controller, two cylinders work alternately, one tube absorbs water, the other tube desorption regeneration, continuous circulation to work.