With nitrogen as the conduction heat transfer medium, realize to the pharmaceutical, biochemical, chemical, biological and other technical areas contain organic solvent, solvent to material drying production with solvent, solvent recovery, production safety, high efficiency, low consumption of energy conservation and emissions reduction. Gases in dryer in fan (wind and air supply), under the circulation of the heat exchanger, the high efficiency filter filtered into the boiling type heating and drying materials, hot air through the material at the same time by the mixing mechanism under stirring constantly make the material in contact with the hot air fully heat exchange. For material in the solvent evaporation (such as alcohol, acetone, methanol), under the drive of circulating gas and gas entrainment in the powder materials, the nitrogen blowing dust catcher, realize the entrained in the gas trap dust material, waste heat of gas through the filter after entering the condenser, the condenser cooling medium and cooling to the dew point and gas separation, and realize the recycling of organic solvent. After the separation of gases by the fan to add again