Ring Formation

If the ring is near the kiln discharge , it might be the ash ring which is not very stable in nature

In the buring zone, ring formation may occur if the % liquid phase went on the higher side than the normal operating range for a particular kiln

I had a personal experience of ring formation in a 3m dia semi dry kiln in the preburning zone. The kiln need to be stopped for every week to break the ring. This was overcome reducing the hot primary temprature from 150 deg C to 90 degC by diluting with fresh air. Higher burning zone temperature would cause the liquid phase formation in the preburning zone itself which would be cooled and formed as ring.

Near the kiln inlet, meal ring formation is normal but not stable

Possible reasons for ring formation,

Raw mix design,

High coal ash

High liquid phase

Quality/ condition of refractory

High alkali feed

Burner pipe condition

Cooler condition

But to study all above reasons we have to run our kiln for 20 ~ 30 days continuously, we have technique to remove big clinker balls without stopping the kiln.

  Vikpro

 

 

Could you please clarify that what technique you have to remove big clinker balls without stopping the kiln?