| 主权项 |
1. A drying apparatus (10, 10A, 10B), comprising a vertical cylindrical drying vessel (11, 11A, 115), a material to be dried being charged thereinto; a heating means for heating a heat-transmitting face (12) of the inner wall of said drying vessel (11, 11A, 11B); and a plurality of rotating vane assemblies (21, 210, 31, 310), being mounted to a rotating axle (20) provided in a central area of said drying vessel (11, 11A, 11B) and extending in a vertical direction,
said plurality of rotating vane assemblies (21, 210, 31, 310) each being comprised of a plurality of circular-arc vane sections (22, 220, 32, 320) disposed so as to be arranged in a circumferential direction around said rotating axle (20); said plurality of circular-arc vane sections (22, 220, 32, 320) each providing a flat surface (23, 230, 33, 330) extending in a circumferential direction in a plan view, the flat surface (23, 230, 33, 330) being capable of placing the material to be dried thereon from one end part thereof and moving the material to be dried to the other end part thereof while raising the material to be dried, the flat surface (23, 230, 33, 330) being formed so as to extend obliquely upward from one end part thereof to the other end part thereof in a direction reverse to the rotating direction (R) of said rotating axle; said plurality of rotating vane assemblies (21, 210, 31, 310) being disposed in a plurality of stages vertically arranged along said rotating axle (20), and by revolution of said rotating axle (20), each of said plurality of circular-arc vane sections (22, 220, 32, 320) of each of the rotating vane assemblies (21, 210, 31, 310) forming a plurality of stages being rotated, thereby a drying process moving the material to be dried from one end part to the other end part of the flat surface (23, 230, 33, 330) of each of said plurality of circular-arc vane sections (22, 220, 32, 320) while raising the material to be dried, and pressing the material to be dried against said heat-transmitting face (12) in a thin film state by the centrifugal force being executed; the clearance (F) between any two adjoining stages of the plurality of stages of the rotating vane assembly (21, 210, 31, 310) being a dimension from the uppermost end at the other end part of a particular circular-arc vane section (22, 220, 32, 320) of a rotating vane assembly (21, 210, 31, 310) to the lowermost end at one end part of a particular circular-arc vane section (220, 320) of the rotating vane assembly (210, 310) one stage thereabove, the dimension being set at 0 to 15% of the diameter of a circle connecting between the adjacent outermost peripheral edges of the flat surfaces (23, 230, 33, 330) of the circular-arc vane sections (22, 220, 32, 320) so as for said drying process to be repeated in a continuous manner in sequence from the rotating vane assembly (21, 31) at the lowest stage to the rotating vane assembly (210, 310) at the highest stage; above the rotating vane assembly (210) at the highest stage, there being disposed a receiving plate (30) provided on the inner wall of said drying vessel (11) for receiving the material to be dried being moved to above the rotating vane assembly (210) at said highest stage while being pressed against said heat-transmitting face (12) in a thin film state, and causing the material to be dried to be dropped down through the inside of the respective rotating vane assemblies (210), said receiving plate (30) being formed of a plate-like member, a face thereof vertically extending in a small width shape being disposed so as to be faced opposite to the rotating direction (R) of said rotating vane assembly (210), two or more receiving plates (30) being arranged with an equal spacing in a circumferential direction. |
