ROTARY MUFFLE FURNACE Russian patent published in 1999 - IPC

FIELD: chemical machine engineering, namely heat treatment of materials, for example at making activated carbon. SUBSTANCE: muffle furnace includes rotary drum in which ceramic muffle is arranged. Muffle has ducts for gas with apertural partitions. Loose inert material partially fills space of ducts whose adjacent walls are provided with slots arranged along ducts. Ratio of duct cross section area to total area of slots is equal to 10-100. Size of inert loose material particles is more than size of holes of partitions and slits of adjacent walls. EFFECT: improved design. 2 dwg