Circle inert particle fluidized bed drying device and drying method thereof

The invention provides a circle inert particle fluidized bed drying device and a drying method thereof. The circle inert particle fluidized bed drying device comprises a drying tank, a feeding device,a heater, an air blower, an inert particle conveying device, a gas-solid separation device and a gas distribution plate, wherein partitions are arranged on the gas distribution plate to divide the drying tank into a plurality of drying chambers. A wet material drying method comprises the steps that one or more groups of heaters and air blowers introduce gases of the same or different temperatureinto the drying tank; the feeding device introduces a wet material into the first drying chamber; inert particles on which the wet material adheres sequentially flow into the next drying chamber underpushing force of material level difference, and drying and product separation are achieved; and the inert particle conveying device conveys the inert particles in the last drying chamber into the first drying chamber, and circ