Shaft kiln utilized for lime production

Details Shaft kiln utilized for lime production Shaft kiln utilized for lime production

1987-06-08

1988-05-31

Yuen, Henry C.

Heating

Processes of heating or heater operation

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

432 95, 432 96, 432 99, 432101, F27B 1500, F27D 108

Patent

active

047477733

ABSTRACT:
A vertical shaft kiln utilized in calcining limestone defines a series of processing zones including an upper preheating zone, a first calcining zone, a second calcining zone having a length twice that of the first calcining zone and a material cooling zone, Burners inject burnt gases intermediate the two calcining zones. Major heat transfer to the limestone is accomplished in the first calcining zone by directing a major portion of the burnt gases in counter-current to the material flow therethrough. Minor heat transfer is accomplished in the second calcining zone by directing a minor portion of the burnt gases therethrough in co-current relation with the material. Combustion air is provided through ducts in the material cooling zones and mixed with the minor portion of burnt gases externally of the shaft prior to injection into the burners.

REFERENCES:
patent: 2788961 (1957-04-01), Pooley et al.
patent: 3142480 (1964-07-01), Azbe
patent: 3285590 (1966-11-01), Parsons
patent: 3544090 (1970-12-01), Peeters
patent: 3887326 (1975-06-01), Townley
patent: 4351119 (1982-09-01), Meunier

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