| 摘要 |
1,213,513. Drying granular material. SCHILDE A.G. 19 Jan., 1968 [25 Jan., 1967], No. 3079/68. Heading F4G. Apparatus for drying particles of relatively dense solid material carried, in a helical path 5, by helical streams of drying air in a cylindrical drying tube 1, into which the particles are continuously fed and from which they are discharged, comprises at least one row of nozzles 2 opening into the tube through their discharge openings 6, and disposed so that the axis of each nozzle 2 is tangential to a helical line of uniform pitch on the wall of the tube, and so that a line 4 connecting the openings 6 of each r ow of nozzles is substantially straight, and is at right angles to each helical line of uniform pitch. A fan feeds drying air to the nozzles. A suitable gas may be used, instead of air, for drying the particles. In the apparatus according to Fig. 4, the particles are fed, through an inlet tube 11, into the top of the drying tube 1<SP>1</SP> and travel, in a helical path 5<SP>1</SP>, downwardly through the drying tube, from the bottom end 12 of which dried particles are discharged through a rotary valve 13. The drying tube is provided with a jacket 16, into which air is fed, through a heater 15, by a circulating fan 14. One row of nozzles 2<SP>1</SP> directs air from the jacket, in helical streams 18, downwardly through the tube 1<SP>1</SP>, and then upwardly, in the form of inner helical streams 19, to be returned, through an air-outlet tube 17 disposed around the tube 11, to the fan 14. In order to control the humidity of the air in the apparatus, some of the air from the fan 14 may be vented to the atmosphere through a valve in a pipe 20, and may be replaced by fresh air supplied at 21 by a fan 22. |
