Thermal treatment of granular or lumpy material, particularly fi

Details Thermal treatment of granular or lumpy material, particularly fi Thermal treatment of granular or lumpy material, particularly fi

1974-12-23

1976-03-02

Camby, John J.

Heating

Processes of heating or heater operation

Including passing, treating or conveying gas into or through...

432 19, 432 99, F27B 1518, F27D 700

Patent

active

039415570

ABSTRACT:
A calcining method and apparatus are provided wherein material to be treated is fed into the top of the furnace and the finished material discharges from the bottom of the furnace and cooling and combustion air enters under forced draft through the bottom of the furnace and flows upwardly through the column of material. A part of the fuel supply is delivered to the region between an upper preheating zone in the furnace and a subjacent combustion or firing zone and the balance of fuel required for firing is introduced into the combustion zone about its periphery. Provision is also made for bypassing part of the cooling air from a lower cooling zone to the combustion zone, with intermediate cleaning of the bypassed air.

REFERENCES:
patent: 2503555 (1950-04-01), Lykken
patent: 3285590 (1966-11-01), Parsons

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