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US 4,050,389 AGranted
Method and apparatus for incinerating waste material
AssigneeNichols Engineering & Research Corporation
InventorCharles F. von Dreusche, Jr.
Life of this patent
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AssigneeNichols Engineering & Research Corporation
InventorCharles F. von Dreusche, Jr.
Estimating the term…
A method and apparatus for incinerating waste material in a multiple hearth furnace having a plurality of vertically spaced hearths wherein waste material is introduced to the furnace at the top thereof and moves downwardly in a generally serpentine fashion moving alternately inwardly and outwardly across the hearths and is discharged at the bottom of the furnace, and including the steps of introducing towards the lowermost hearth thereof air in a quantity less than that theoretically required for complete combustion of the material being processed, thereafter at successively higher hearths ascertaining the temperature at each hearth and adding air thereto in quantities only sufficient to support combustion thereon, and on each hearth in the middle portion of the furnace adding only enough air to each hearth so as to maintain the temperature on that hearth under a maximum predetermined limit, and on the hearths towards the top of the furnace reducing the quantity of air added, and thence discharging the exhaust gases at the top of the furnace.
In a multiple hearth furnace having a plurality of vertically spaced hearths, wherein waste material is introduced to the furnace at the top thereof and moves downwardly in a generally serpentine fashion moving alternatively inwardly and outwardly across the hearths and is discharged at the bottom of the furnace, a method comprising the steps of introducing towards the lowermost hearth thereof air in a quantity less than that theoretically required for complete combustion of the material being processed, thereafter at successively higher hearths ascertaining the temperature at each hearth and adding air thereto in quantities only sufficient to support combustion thereon, and on each hearth in the middle portion of said furnace adding only enough air to each hearth as to maintain the temperature on that hearth under a maximum predetermined limit, and thence discharging exhause gases at the top of said furnace.
Apparatus for incinerating waste material comprising, in combination, a multiple hearth furnace having a plurality of vertically spaced hearths, a rotatable center shaft extending through the center of the furnace and passing through each hearth, a plurality of spaced rabble arms secured to the center shaft and extending radially outwardly over each hearth, alternate hearths having drop holes disposed towards the center shaft and the other hearths having drop holes disposed toward the outer periphery thereof, said furnace having an upper material inlet and a lower material dispensing outlet, and said furnace having an upper exhaust gas outlet, means for introducing towards the lowermost hearth thereof air in a quantity less than that theoretically required for complete combustion of the material being processed, means disposed on successively higher hearths for ascertaining the temperature at each hearth and means for adding air thereto in quantities only sufficient to support combustion thereon, means disposed on each hearth in the middle portion of the furnace for adding only enough air to each hearth to maintain the temperature on that hearth under a predetermined maximum limit.
Dependencies are inferred from the claim text.