Abstract: This invention relates to incinerators for the disposal of urban waste. More particularly, it relates to incinerators of the type comprising a rotary furnace of highly heat-resistant steel, having a horizontal axis of rotation and comprising a drying chamber and an incinerating chamber; drive means for rotating the furnace; charging means for feeding refuse to the drying chamber; a burner projecting into the drying chamber; afterburner means for recombusting any incompletely burned refuse leaving the incinerating chamber and for ridding combustion gases of solids; means for supplying preheated comburent air to the furnace; and means for cooling and exhausting the combustion gases.