CONTROL DE NIVELES DE HORNOS ROTATIVOS

摘要

A horizontally mounted rotary cylindrical furnace is provided with an internal helical flight for at least the preponderant part of one revolution but not more than two revolutions of the furnace so that two zones are formed within the rotary furnace. The pitch of the flight can be controlled so that material fed to the first zone is conveyed to the second zone at a rate greater than the rate of feed to the first zone. The height of the helical flight can be set so a deeper bed and greater retention time is obtained in the solids down stream of the flight. Also disclosed is a discharge mechanism which is a tapered helical rotor with its larger vanes being coextensive with and fixed to the furnace diameter and the smaller vanes being mounted in an co-extensive with and fixed to a take-off conveyer tube.