| 摘要 |
A shrouded rabble includes a blade having an active face and a backface with a shroud extending from the backface along a lower edge of the blade. The rabble is suspended above a perforated hearth for urging charge materials on the hearth from one location to another in response to relative rotation between the hearth and the rabble. The action of the rabble on the charge materials causes breakdown of the charge materials and accumulation of fines on the perforated hearth. The shroud defines a shroud chamber behind the blade and screens charge materials from the shroud chamber to expose accumulated fines on the perforated hearth. The charge fines thus become fluidized in an upflowing heating gas and exit the shroud chamber through at least one opening in the shroud, facilitating the flow of heating gas through the perforated hearth and into the charge materials. The opening may simply comprise one end of the shroud being open, or it may include a plurality of holes in the shroud itself. Finally, at least one upwardly directed tube may penetrate the shroud to deposit the fines onto a top surface of the charge materials.
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