Abstract: An incinerator for burning waste material employs an additional grate on which waste material is burned, thereby producing a layer of heated ashes and coke. The smoke and gases produced by the burning waste material are caused to be passed downwardly through this very hot layer of coke, thereby raising the temperature of the waste gases and burning off noxious pollutants entrained therein. The invention also provides a series of burning stations with adjacent ones burning in opposite directions; i.e., upwardly and downwardly. All waste gases and smoke produced by the burning waste material will pass sequentially through the series of burning stations, all of which will have a layer of hot coke, before being exhausted to the atmosphere.

Abstract: Method and furnace for the incineration of combustible material and the generation of hot gas, the furnace comprising a lower chamber provided with an inlet for air and an inlet for combustible material and an upper chamber provided with an inlet for air and a stack which chambers are communicated with each other inside the furnace, and the method comprising blowing air and combustible material into the lower chamber of the furnace in a direction tangential to the wall of the lower chamber and blowing air into the upper chamber of the furnace in a direction tangential to the wall of the upper chamber for thereby generating hot gas in the upper chamber.

Abstract: Method and furnace for the incineration of combustible material and the generation of hot gas, the furnace comprising a lower chamber provided with an inlet for air and an inlet for combustible material and an upper chamber provided with an inlet for air and a stack which chambers are communicated with each other inside the furnace, and the method comprising blowing air and combustible material into the lower chamber of the furnace in a direction tangential to the wall of the lower chamber and blowing air into the upper chamber of the furnace in a direction tangential to the wall of the upper chamber for thereby generating hot gas in the upper chamber.

Abstract: The constriction plate in a fluidized bed incinerator is pivotally mounted for swinging movement down into the windbox. Thereby, the fluidized bed can be rapidly emptied into the windbox, whereby heat sensitive members in the incinerator will not be damaged by the hot refractory particles in the bed.

Abstract: Sluice gate members mounted for swinging movement about a shaft offset from the center of a furnace and arranged to be moved both gradually and discontinuously are interposed between an upper pyrolysis and precombustion chamber and a lower afterburning chamber. The movement of these sluice gate members causes particles of the fire bed supported on them to drop down into the afterburning chamber, largely in the form of embers, at about the same rate as additional waste material is added to the fire bed, so as to maintain a fire bed of approximately constant size. The sluice gate members are hollow and secondary air is blown into them near the shafts on which they are mounted and flows out through holes on their bottom surfaces and in their facing tip edges and then proceeds downward to contribute to the afterburning process.

Abstract: Ducts for carrying off hot gas given off from the combustion chamber of an incinerator are built into the outer walls of a pyrolysis chamber located above the combustion chamber. The pyrolysis chamber has cross-sectional dimensions that are small enough to assure that heat from the gas ducts in walls completely penetrate the fill of waste in the pyrolysis chamber. Sluice gates are provided between the pyrolysis chamber and the combustion chamber on which the fill of the pyrolysis chamber rests when the gates are quiescent. The gates are moved to allow fragments of the pyrolysis products to drop into the combustion chamber or to turn over material resting on the gates.

Abstract: A method and apparatus for treating off-gas from a furnace for burning organic material in an oxygen deficient atmosphere by passing the hot exhaust gases from the furnace ladened with combustible and noncombustible organic material to a cleaning device, and thence passing the gases to a secondary furnace for combustion therein, and while in the cleaning device removing from the gas therein noncombustible material which would otherwise still be particulate matter in the exhaust from the secondary furnace. In another form of the invention, the exhaust gas from the furnace is passed to a burner and heat exchanger device having an inlet portion for heating the incoming gases, a combustion portion with air inlets for supporting combustion therein, and an outlet portion for cooling the gases, and thereafter the gases are passed to a quenching system.