| 摘要 |
A rotary dryer in which the rate of the bed transport is adjustable. The dryer shell is provided with at least one set of flights and a dam ring with the dam ring being spaced downstream of the flights to provide a flight-free area. Adjustable means are provided to transport material from the flight-free area over the dam ring to the downstream side thereof upon rotation of the shell to vary the amount of material retained upstream from the dam ring. In addition, means are provided to convey material from the flight-free area to a point adjacent the upstream end of the flights. Further, a cooling section is also included comprising a plurality of flights. Means for supplying co-current drying gas may be provided at the feed end of the dryer and means for supplying counter-current cooling gas may be provided adjacent the discharge end.
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