Patent ID: 6447598
Filing Date: 2002-09-10
Classification: C04B

Abstract:
A process for the thermal treatment of meal-form raw materials, in the production of cement clinker from raw meal which is preheated in at least one heat exchanger train traversed by an exhaust gas stream of a rotary tubular kiln, is calcinated in a precalcination stage, and is burned into cement clinker in a sintering zone of the rotary tubular kiln, which is cooled in a downstream-engaged cooler, in which system in the precalcination stage the exhaust gas stream of the rotary tubular kiln is used for the precalcination of the raw meal, comprising:continuously measuring the content of at least one of CO, hydrocarbons, NOx and other combustion products in said exhaust gas stream, and in dependence on this measured value, intervening and regulating an amount of at least one of an oxidation agent and catalyst to be injected into the exhaust gas stream, in such manner that upon measuring a rising content in such combustion products, the injected amount of said oxidation agent and/or catalyst is increased, and vice versa to precalcinate the raw meal with a low oxygen ratio within the precalcination stage.