Considerations of kiln speed and kiln filling degree originate from the days of long kilns where the residence time of the material might be measured in hours. In those cases the impact of a change in feed rate would not be felt in the burning zone for many hours. With a modern precalciner kiln other considerations have to be taken into account. ...

Turk, A low NOx precalciner has staged combustion at different parts of the precalciner to create a zone with reducing conditions which destroys NOx formed in the burning zone of the kiln. Best regards Dr Michael Clark

The burning zone of a cement kiln is the hottest part of the kiln, under the flame where the final combination into the clinker minerals takes place. Behind that burning zone is the upper transition zone where the temperatures is rising to that in the burning zone. In front of that burning zone where the clinker has been formed and is about to ...

There could be many causes for such a sudden rush of material in the burning zone. Possibly the breakaway of some coating or a ring. A sudden change in feed chemistry or fuel calorific value. It is impossible to diagnose the cause without much more information. Thanks Dr Michael Clark