DRUM-HELICAL MICROWAVE DRYING DEVICE OF CONTINUOUS ACTION FOR DRYING OF LOOSE AND GRANULATED MATERIALS Russian patent published in 2014 - IPC F26B11/06 F26B3/347 

FIELD: heating, drying.

SUBSTANCE: invention relates to equipment for continuous drying of loose and granulated materials. The device comprises a frame with a drive and a gear, a horizontally installed rotary drum with inner radius r=(0.5…6)λ, where γ - length of microwave in the free space. In the drum there is a loading device rigidly fixed to the frame, a transporting auger, rigidly connected to the drum, the last turn of which has height of $${\text{h}}_{\text{p1}}\text{£r-}\frac{{\text{d}}_{\text{hole}}}{\text{2}}\text{,}$$ where d_hole - diameter of hole in the unloading end cover, mixing blades, rigidly fixed with pitch p_b=15…90° along the inner surface of the drum, with height of h_b=(0.1…0.5)h_p and the unloading hole. Holes of beyond wave guides match with the unloading hole and are rigidly connected to the outer surface of the drum, besides, their total area should be more than or equal to the area of the unloading hole. The waveguide-slot resonant radiator is connected to a microwave generator. On top of this radiator there is a device for removal of steam and air mixture, and at the bottom - a device for heated air supply. Areas of connection of end covers with the drum and also areas of insertion of the specified devices are sealed with materials absorbing high-frequency electromagnetic radiation.

EFFECT: invention makes it possible to provide for continuous process of drying of loose materials with their even distribution along inner surface of the drum, simplifies design of devices for heated air supply and moist air bleed, accelerates process of loose materials drying to minimum content of moisture (not more than 1,5-3%).

4 cl, 2 dwg