Furnaces – With fuel treatment means – Preliminary refuse treatment means
Patent
1976-07-19
1977-09-27
Sprague, Kenneth W.
Furnaces
With fuel treatment means
Preliminary refuse treatment means
202117, 432139, F23G 504, F27B 922
Patent
active
040503895
ABSTRACT:
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.
REFERENCES:
patent: 3379622 (1968-04-01), von Dreusche, Jr.
patent: 3861332 (1975-01-01), Itasaka
patent: 3905757 (1975-09-01), VON Dreusche, Jr.
patent: 3958920 (1976-05-01), Anderson
patent: 3968756 (1976-07-01), Yamada
Grimes Edwin T.
Nichols Engineering & Research Corporation
Sprague Kenneth W.
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