Heating – Tumbler-type rotary - drum furnace – Having flexible – cooled – or air curtain seal between rotary...
Patent
1976-03-04
1977-10-04
Camby, John J.
Heating
Tumbler-type rotary - drum furnace
Having flexible, cooled, or air curtain seal between rotary...
110 14, 432106, 432112, F27B 724, F27B 708
Patent
active
040521516
ABSTRACT:
A rotary kiln has a main cylindrical processing zone which is coupled downstream and upstream, respectively, to the charge-receiving and charge-withdrawal ports of the kiln through a pair of gas-tight spiral ducts. A reagent to be reacted with the charge is introduced coaxially into the main processing zone, and the spent reaction gases are coaxially removed therefrom. The reaction gas outlet conduit is provided with a hydraulic seal for maintaining a desired value of superatmospheric pressure in the main processing zone, and an additional gas conduit coaxial with the gas withdrawal conduit means is arranged to supply gaseous fuel to a plurality of heating tubes which are disposed in spaced relation through the walls of the main processing zone. Advantageously, the charge is preheated to the reaction temperature in a fluidization furnace or the like disposed upstream of the rotary kiln, and flue dust emitted from the preheating furnace is cleaned and routed into the main processing zone of the kiln along with the reagent. A rotary condenser disposed downstream of the kiln for subjecting the treated charge to an additional process step is provided with a protective atmosphere consisting of the spent reactive gases from the main processing zone of the rotary kiln, such reaction gases having first been cleaned by means of a filter located downstream of the hydraulic seal.
REFERENCES:
patent: 560742 (1896-05-01), Navarro
patent: 1178957 (1916-04-01), Smaill
patent: 1690820 (1928-11-01), Hornsey
patent: 2697068 (1954-12-01), Poindexter et al.
patent: 2743918 (1956-05-01), Struckmann
patent: 3954391 (1976-05-01), Gottlieb
Alexa Miloslav
Pedlik Miroslav
Reichrt Vaclav
Smalek Josef
Camby John J.
Vyzkumny ustav kovu
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