Freezing dryer for pneumatic material conveying system

The utility model discloses a freezing dryer for a pneumatic material conveying system, and belongs to the technical field of freezing drying in the pneumatic material conveying system. The device comprises a heat exchanger, an evaporator, a steam-water separator, a compressor and a condenser, a bottom channel pipeline of the heat exchanger is communicated with the top of the evaporator, the bottom of the evaporator is communicated with the side wall of the steam-water separator through a pipeline, the top of the steam-water separator is communicated with the bottom of the side wall of one side of the heat exchanger through a pipeline, and a coil pipe is further arranged in the evaporator. One end of the coil pipe extends out of the evaporator and communicates with the output end of the compressor through a pipeline. The steam-water separator, the heat exchanger, the compressor and the evaporator are adopted to form core components of the refrigeration dryer, passing compressed air is reduced to be below the