Sealed and zone rotary grate convection solids processing apparatus

摘要

A rotary hearth furnace includes a base having a plurality of first plenums, an upper chamber having a plurality of second plenums and a hearth rotatable between the base and the upper chamber and having a plurality of third plenums. The hearth is moveable between the base and the upper chamber so that two or more of the third plenums are positionable to receive gas exhausted by one of the first plenums and to discharge the received gas into one of the second plenums.