Fluidized bed incinerator

Claim 1

A fluidized bed incinerator for waste material comprising shield wall means defining therein a first cylindrical combustion chamber, means for drying and burning waste materials in the chamber under forced air and at high temperatures, an annular rotatable hearth rotatable about a vertical axis in the combustion chamber and defining the bottom thereof, means for rotating the hearth, an opening in said wall means and conveyer means for charging waste materials through said opening onto the periphery of said hearth, said hearth having a downwardly extending outlet in the center thereof, means disposed above the hearth for moving the waste materials from the periphery to the center of the hearth and for breaking up and agitating the material to ensure contact with the hot air and high temperatures in the first combustion chamber and effect a drying and partial burning thereof, a second combustion chamber for completing the burning thereof comprising a fluidized bed furnace connected to the outlet in the hearth for receiving the dried and partially burnt material as it falls through the outlet, said furnace having a perforated plate located in the lower portion of the second combustion chamber, means for forcing air upwardly through the plate into said second combustion chamber to maintain the materials in a fluidized and burning state, and an ash outlet extending upwardly through the plate and the center of the second combustion chamber and having an upper inlet end in the chamber for receiving ash from the second combustion chamber and a lower outlet end for discharging the ash from the incinerator.