To provide an inexpensive, safe and easily operated and maintained fluidized-bed drying and classifying device of a simple structure in which both the degree of dryness and classified particle diameter are controllable while maintaining a well stabilized fluidized bed.
A porous gas diffuser plate 12 is disposed below a fluidized bed 14 in a main body 10, a wind box 16 disposed below a diffuser plate 12 is shaped into a hopper, and a discharger 29 for continuously discharging the particles falling into the wind box 16 is connected to the lower end of the wind box 16. Further, a gas feed system for supplying hot air for drying and fluidization gas acting as a classification gas into the wind box 16 is connected to the wind box 16, and the system is provided with a flow control means for controlling the diameter of classified particles (equivalent to the freeboard flow rate) by adjusting the gas flow rate and a temp. control means for controlling the degree of dryness by adjusting the temp. of the hot gas supplied into the wind box 16 depending on the adjusted gas flow rate.
HAYASHI ISAO
MURAO MIKIO
