Vertical circulating suspension air dryer and material air drying method thereof

The invention relates to a vertical circulating suspension air dryer. The vertical circulating suspension air dryer comprises an outer cylinder, an inner cylinder, a spiral blade, a feeding opening, a discharging opening and an air inlet, wherein the inner cylinder penetrates through the outer cylinder and is fixed to the outer cylinder, the spiral blade is arranged in the inner cylinder and connected with the outer cylinder, a power mechanism is arranged at one end of the spiral blade, an upper circulation opening is formed in the upper portion of the inner cylinder, a lower circulation opening is formed in the lower portion of the inner cylinder, the feeding opening and the discharging opening are formed in the inner cylinder or the outer cylinder, and the air inlet is formed in the inner cylinder. According to the vertical circulating suspension air dryer, materials are circulated between the outer cylinder and the inner cylinder, physical binding water and chemical binding water of the materials are conve