Patent ID: 6595772
Filing Date: 2003-07-22
Classification: C04B,F27B,F27D,Y02P

Abstract:
A method for the thermal treatment of mealy raw material, specifically in the production of cement clinker from raw meal, in which the raw meal is thermally treated in a combustion process by preheating, calcination, sintering, and cooling, and an exhaust gas stream of the sintering stage in a rotary kiln and an exhaust airstream formed of tertiary air of the cooling stage from a clinker cooler are used in a calcination stage for the calcination of the raw meal in such a way that fuel is fed into both an exhaust gas channel of the rotary kiln and a first tertiary air channel, the two channels are merged, and a gas-solid suspension that is contained therein is fed into a lowermost cyclone of a cyclone suspension type pre-heater system for the purpose of separating calcinated raw meal out of the gas stream, comprising the steps of:introducing lumpy fuel via a displacement mechanism that is arranged transversely in an additional tertiary air channel in an area of a junction of the additional tertiary air channel with the exhaust gas channel of the rotary kiln; pyrolizing or burning said lumpy fuel on the displacement mechanism with the aid of a tertiary air substream; and moving a residue of the pyrolysis, or respectively, a combustion, from a displacement mechanism into the exhaust gas channel of the rotary kiln, while a pyrolysis gas, or respectively, a smoke gas, is likewise directed into the exhaust gas channel of the rotary kiln.