Process for the thermal treatment of meal-form raw materials
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United States of America Patent
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Sep 10, 2002
Grant Date -
Jul 12, 2001
app pub date -
Dec 13, 2000
filing date -
Dec 23, 1999
priority date (Note) -
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Abstract
In order to create a process for the economical production of cement clinker in a cement clinker production line with a raw meal preheater, a precalcination stage, a rotary tubular kiln and a clinker cooler, in which the total oxygen excess required for all firing points, i.e., the ratio of total oxygen to total fuel, also designated as .lambda. value, is to lie as low as possible, it is proposed according to the invention, to continuously measure the content of CO and/or (unburned) hydrocarbons and/or other combustion products in the exhaust gas path of the precalcination stage and, in dependence on this measurement value, to perform a regulating intervention on the amount of an oxidation agent and/or catalyst to be injected into the precalcination stage.
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