Shaft kiln

Details Shaft kiln Shaft kiln

1981-02-06

1982-10-05

Camby, John J.

Heating

Processes of heating or heater operation

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

432 79, 432 96, 432 99, F27B 1500, F27D 1502, F27D 108

Patent

active

043526616

ABSTRACT:
Air heated outside the calcining zone of a shaft kiln is passed through raw material in a hopper mounted above the kiln in order to preheat the raw material. In one embodiment the preheating air is heated by an excess air burner which communicates with the hopper. In another embodiment, the hot calcined material is cooled by forcing cool air through it and the heated air is utilized as preheating air by directing it through a by-pass conduit which connects the cooling zone of the kiln with an extension of the hopper. In neither embodiment does the preheating air constitute combustion supporting air.

REFERENCES:
patent: 1895284 (1933-01-01), Hay
patent: 2788961 (1957-04-01), Pooley et al.
patent: 2948521 (1960-08-01), Heiligenstaedt
patent: 3142480 (1964-07-01), Azbe
patent: 4002422 (1977-01-01), Escott
patent: 4140480 (1979-02-01), Kaiser et al.
patent: 4248639 (1981-02-01), Quittkat

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