| 摘要 |
A rotary dehydrator-granulator is provided for receiving viscid, high moisture content material such as middlings, bran or the like for processing into a dried granular form suitable for livestock feed. The material is conveyed through an inlet and interiorly along an elongated rotating drum by an auger in an open trough which discharges the material at an end opposite the inlet for subsequent tumbling by the drum. A suction fan draws the material, along with hot air emanating from a hot gas source, back toward a perforated screen outlet at the same end of the drum as the inlet. As the material is being tumbled, a portion of the semidried material is deposited in the open auger trough and mixed with moist material. By controlling the temperature of the hot air a predetermined amount of moisture may be removed from the thoroughly mixed material by the time it reaches the outlet, thereby lessening the adhesive quality of the material such that it separates into relatively small, substantially uniform granules of reduced moisture content which drop out of the drum through the outlet. That material which has not been sufficiently dried and formed into granules of a size to permit their exit through the outlet continue to tumble until their size becomes small enough to allow them to drop through the outlet or, in the case of overdrying, the fan draws the material past the outlet and into a dust collector from which the material is returned to the drum for remixing with moist material.
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