Abstract: A fluidized bed combustor having a distributor plate assembly including an inverted frustopyramidal surface with slots and offset shields thereover to form laterally oriented air flow openings into the combustion chamber from a first plenum for debris particle classification along said surface. At the bottom of each frustopyramidal surface is an outlet for classified debris. Air flow riser tubes project up from a second plenum to a position above said surface. Forced air is supplied to the slots and the risers, with means to regulate relative flow to them.Projecting down from the debris outlets are drop tubes having cooling fins, such tubes connecting to inlets of an auger conveyor. The auger conveyor has a coolant-cooled housing and a coolant-cooled auger.

Abstract: A fluidized bed combustor having in its distributor plate assembly at the bottom of the combustion chamber, air outlets in the distributor plate surface, air flow riser tubes projecting above said surface, light liquid fuel nozzles located adjacent certain of the riser tubes for injection of liquid fuel into the air forcefully flowing up these riser tubes, and the share of air flowing through the riser tubes relative to the share of air flowing through the outlets being controlled by regulating means.

Abstract: A fluidized bed combustion, unitized transportable fire tube boiler package supported by its framework and housed within an insulated housing that ducts incoming air to preheat it while serving as a noise abutment shield. The water and steam retaining pressure vessel has an upright lower portion tapered divergently upwardly and enclosing a like-configurated, fluidized bed combustion housing spaced therefrom to form a water jacket therebetween. The pressure vessel also has a horizontally elongated upper portion enclosing a plurality of sets of combustion-gas tubes interconnected by flow reversing end members and surrounded by water.