Solid fuel burning-furnace having a vertically mounted cylindrical combustion chamber

An apparatus for burning solid fuel comprising a cylindrical furnace having a vertical axis in which combusting fuel and gases are rotated to centrifugally move entrained particulates and denser gases to the perimeter of the cylindrical furnace and incorporating at least one extraction duct for removing at least a portion of said entrained particulates, said extraction duct intersecting said cylindrical furnace at a location in the upper half of said cylindrical furnace, such that a portion of said gas exits the cylindrical furnace as extracted gas through at least one of said extraction ducts and a portion of said gas moves through the cylindrical furnace exiting out the top of said cylindrical furnace, in which:

• an air cooled and refractory lined combustion chamber is located contiguously below said cylindrical furnace, said combustion chamber being circular in plan form, in which solid fuel particles are injected tangentially into said combustion chamber and at least partially burned therein;
• and
• the floor of said combustion chamber is an air cooled and refractory lined truncated cone with the truncation being at the bottom and in which a movable grate is located at said truncation to facilitate periodic removal of ash and contaminants.

An apparatus for burning solid fuel comprising a cylindrical furnace having a vertical axis in which combusting fuel and gases are rotated to centrifugally move entrained particulates and denser gases to the perimeter of the cylindrical furnace and incorporating at least one extraction duct for removing at least a portion of said entrained particulates, said extraction duct intersecting said cylindrical furnace at a location in the upper half of said cylindrical furnace, such that a portion of said gas exits the cylindrical furnace as extracted gas through at least one of said extraction ducts and a portion of said gas moves through the cylindrical furnace exiting out the top of said cylindrical furnace, in which at least some of said gas exiting out the top of said cylindrical furnace is used to heat and/or at least partially dry at least some of the incoming fuel.