Patent ID: 6279492
Filing Date: 2001-08-28
Classification: F23G

Abstract:
A method of thermally decomposing waste materials comprising the steps ofa) providing a frame having powered rollers supporting a horizontally elongated furnace having a large diameter primary burn chamber portion and a smaller diameter exhaust portion, said primary burn chamber and said exhaust portion being integrally connected through a tapered conveyor portion, said conveyor portion having internal baffles shaped as a helix, said furnace having an inner wall and an outer wall with a draft passageway located between said walls, with one end of said draft passageway located in said primary burn chamber and the other end having a draft control valve covering an opening in said outer wall,b) adding waste materials to said primary burn chamber and thermally decomposing said waste materials,c) continuously mixing said waste materials in said primary burn chamber by rotating said powered rollers, said mixing resulting from said waste materials advancing partially along said helix then returning to said large diameter burn chamber through the action of gravity,d) moving any combustion residue of the waste materials from the primary burn chamber through said conveyor portion and into said exhaust portion by advancing said residue by the action of said baffles,e) providing a balanced draft to said primary burn chamber through automatic actuation of said draft control valve by closing said draft control valve by mechanical bias at a lower temperature, and by opening said draft control valve in response to the difference in thermal expansion between said inner wall and said outer wall at a higher temperature.